diff options
59 files changed, 9413 insertions, 43191 deletions
diff --git a/plugins/MirOTR/DEPENDENCIES.txt b/plugins/MirOTR/DEPENDENCIES.txt index 4a005e605b..b1adc82e2b 100644 --- a/plugins/MirOTR/DEPENDENCIES.txt +++ b/plugins/MirOTR/DEPENDENCIES.txt @@ -5,7 +5,7 @@ Libgpg-error ( https://gnupg.org/download/ ) Libgcrypt ( https://gnupg.org/download/ )
1.6.3
libotr ( https://otr.cypherpunks.ca/ )
- 3.2.0 (hash 2deecec)
+ 4.1.0-dev (hash 03e3cad)
@@ -51,8 +51,22 @@ HOW_TO_UPDATE_DEPENDENCIES - copy config.h to our Libgcrypt custom/
- config.h: see CONVERT_CONFIG_H_FROM_GCC_TO_MSVC
- - libotr (from Git)
- - tbd
+ - libotr (from Git hash 03e3cad)
+ - run MSYS from checked out Git repository inside MirOTR directory (or change relative paths below)
+ export ACLOCAL_PATH=$ACLOCAL_PATH:$(pwd)/../Libgcrypt/src
+ export LIBGCRYPT_CONFIG=$(pwd)/../Libgcrypt/src/libgcrypt-config
+ ./bootstrap
+ ./configure --with-pic
+ - copy files found in our "read/" folder
+ - copy .c and .h files from src/ to our libotr
+ - src/message.c: fix C99 at line 472 by declaring "now" before "fragment_and_send()" and assign after its call
+ - src/instag.c: fix C99 at line 93 by moving "if (!instf) return gcry_error(GPG_ERR_NO_ERROR);" down a bit
+ - src/proto.c: add snprintf define after last include
+ #define snprintf _snprintf /* Miranda NG modification */
+ - copy config.h to our libotr custom/
+ - config.h: see CONVERT_CONFIG_H_FROM_GCC_TO_MSVC
+ - if libotr's protocol changed, adapt our version string in MirOTR's otr.h
+
diff --git a/plugins/MirOTR/libotr/custom/config.h b/plugins/MirOTR/libotr/custom/config.h index f5b4638ae1..9cf22ee400 100644 --- a/plugins/MirOTR/libotr/custom/config.h +++ b/plugins/MirOTR/libotr/custom/config.h @@ -1,66 +1,74 @@ -
-/* 18/09/2005 fpi */
-/* config.h created to compile libotr.2.0.2 with VisualC++ */
-
-#ifndef CONFIG_H
-#define CONFIG_H
-
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#undef HAVE_DLFCN_H
-
-/* Define to 1 if you have the <inttypes.h> header file. */
-#undef HAVE_INTTYPES_H
-
-/* Define to 1 if you have the <memory.h> header file. */
-#define HAVE_MEMORY_H 1
-
-/* Define to 1 if you have the <stdint.h> header file. */
-#undef HAVE_STDINT_H
-
-/* Define to 1 if you have the <stdlib.h> header file. */
-#define HAVE_STDLIB_H 1
-
-/* Define to 1 if you have the <strings.h> header file. */
-#undef HAVE_STRINGS_H
-
-/* Define to 1 if you have the <string.h> header file. */
-#define HAVE_STRING_H 1
-
-/* Define to 1 if you have the <sys/stat.h> header file. */
-#undef HAVE_SYS_STAT_H
-
-/* Define to 1 if you have the <sys/types.h> header file. */
-#undef HAVE_SYS_TYPES_H
-
-/* Define to 1 if you have the <unistd.h> header file. */
-#define HAVE_UNISTD_H 1
-
-/* Name of package */
-#define PACKAGE "libotr.2.0.2.vs6.win32.fpi"
-
-/* Define to the address where bug reports for this package should be sent. */
-#undef PACKAGE_BUGREPORT
-
-/* Define to the full name of this package. */
-#undef PACKAGE_NAME "libotr 2.0.2 build with VisualC++ 6.0 by fpi"
-
-/* Define to the full name and version of this package. */
-#undef PACKAGE_STRING
-
-/* Define to the one symbol short name of this package. */
-#undef PACKAGE_TARNAME
-
-/* Define to the version of this package. */
-#undef PACKAGE_VERSION
-
-/* Define to 1 if you have the ANSI C header files. */
-#define STDC_HEADERS 1
-
-/* Version number of package */
-#undef VERSION
-
-//#define snprintf(a,b,c, ...) \
-// _snprintf (a,b,c, ## __VA_ARGS__)
-//#define snprintf _snprintf
-
-#endif
+/* config.h. Generated from config.h.in by configure. */ +/* config.h.in. Generated from configure.ac by autoheader. */ + +/* Define to 1 if you have the <dlfcn.h> header file. */ +/* #undef HAVE_DLFCN_H */ + +/* Define to 1 if you have the <inttypes.h> header file. */ +/* #undef HAVE_INTTYPES_H */ + +/* Define to 1 if you have the <memory.h> header file. */ +#define HAVE_MEMORY_H 1 + +/* Define to 1 if you have the <stdint.h> header file. */ +#define HAVE_STDINT_H 1 + +/* Define to 1 if you have the <stdlib.h> header file. */ +#define HAVE_STDLIB_H 1 + +/* Define to 1 if you have the <strings.h> header file. */ +/* #undef HAVE_STRINGS_H */ + +/* Define to 1 if you have the <string.h> header file. */ +#define HAVE_STRING_H 1 + +/* Define to 1 if you have the <sys/stat.h> header file. */ +#define HAVE_SYS_STAT_H 1 + +/* Define to 1 if you have the <sys/types.h> header file. */ +#define HAVE_SYS_TYPES_H 1 + +/* Define to 1 if you have the <unistd.h> header file. */ +/* #undef HAVE_UNISTD_H */ + +/* Define to the sub-directory where libtool stores uninstalled libraries. */ +#define LT_OBJDIR ".libs/" + +/* Name of package */ +#define PACKAGE "libotr" + +/* Define to the address where bug reports for this package should be sent. */ +#define PACKAGE_BUGREPORT "otr@cypherpunks.ca" + +/* Define to the full name of this package. */ +#define PACKAGE_NAME "libotr" + +/* Define to the full name and version of this package. */ +#define PACKAGE_STRING "libotr 4.1.0" + +/* Define to the one symbol short name of this package. */ +#define PACKAGE_TARNAME "libotr" + +/* Define to the home page for this package. */ +#define PACKAGE_URL "https://otr.cypherpunks.ca" + +/* Define to the version of this package. */ +#define PACKAGE_VERSION "4.1.0" + +/* Define to 1 if you have the ANSI C header files. */ +#define STDC_HEADERS 1 + +/* Version number of package */ +#define VERSION "4.1.0" + +/* Miranda NG modifications */ +#define GPGRT_ENABLE_ES_MACROS 1 +#include <string.h> +#define strdup _strdup +#define stricmp _stricmp +#define snprintf _snprintf +#ifdef _WIN64 +# define __x86_64__ 1 +#else +# define __i386__ 1 +#endif diff --git a/plugins/MirOTR/libotr/libotr_10.vcxproj b/plugins/MirOTR/libotr/libotr_10.vcxproj index ed769ffd25..9a22e152cf 100644 --- a/plugins/MirOTR/libotr/libotr_10.vcxproj +++ b/plugins/MirOTR/libotr/libotr_10.vcxproj @@ -133,7 +133,9 @@ <ClCompile Include="src\auth.c" />
<ClCompile Include="src\b64.c" />
<ClCompile Include="src\context.c" />
+ <ClCompile Include="src\context_priv.c" />
<ClCompile Include="src\dh.c" />
+ <ClCompile Include="src\instag.c" />
<ClCompile Include="src\mem.c" />
<ClCompile Include="src\message.c" />
<ClCompile Include="src\privkey.c" />
@@ -146,7 +148,9 @@ <ClInclude Include="src\auth.h" />
<ClInclude Include="src\b64.h" />
<ClInclude Include="src\context.h" />
+ <ClInclude Include="src\context_priv.h" />
<ClInclude Include="src\dh.h" />
+ <ClInclude Include="src\instag.h" />
<ClInclude Include="src\mem.h" />
<ClInclude Include="src\message.h" />
<ClInclude Include="src\privkey-t.h" />
diff --git a/plugins/MirOTR/libotr/libotr_12.vcxproj b/plugins/MirOTR/libotr/libotr_12.vcxproj index 8698501aca..de574568fe 100644 --- a/plugins/MirOTR/libotr/libotr_12.vcxproj +++ b/plugins/MirOTR/libotr/libotr_12.vcxproj @@ -121,7 +121,9 @@ <ClCompile Include="src\auth.c" />
<ClCompile Include="src\b64.c" />
<ClCompile Include="src\context.c" />
+ <ClCompile Include="src\context_priv.c" />
<ClCompile Include="src\dh.c" />
+ <ClCompile Include="src\instag.c" />
<ClCompile Include="src\mem.c" />
<ClCompile Include="src\message.c" />
<ClCompile Include="src\privkey.c" />
@@ -134,7 +136,9 @@ <ClInclude Include="src\auth.h" />
<ClInclude Include="src\b64.h" />
<ClInclude Include="src\context.h" />
+ <ClInclude Include="src\context_priv.h" />
<ClInclude Include="src\dh.h" />
+ <ClInclude Include="src\instag.h" />
<ClInclude Include="src\mem.h" />
<ClInclude Include="src\message.h" />
<ClInclude Include="src\privkey-t.h" />
diff --git a/plugins/MirOTR/libotr/read/AUTHORS b/plugins/MirOTR/libotr/read/AUTHORS index 50a839dc84..cf8140c590 100644 --- a/plugins/MirOTR/libotr/read/AUTHORS +++ b/plugins/MirOTR/libotr/read/AUTHORS @@ -2,6 +2,8 @@ Off-the-Record Messaging Library and Toolkit Authors: - Ian Goldberg, Chris Alexander, Nikita Borisov <otr@cypherpunks.ca> + Ian Goldberg, David Goulet, Rob Smits, Chris Alexander, Willy Lew, + Lisa Du, Nikita Borisov + <otr@cypherpunks.ca> See the README file for mailing list information diff --git a/plugins/MirOTR/libotr/read/COPYING b/plugins/MirOTR/libotr/read/COPYING index 5b6e7c66c2..73680a2db0 100644 --- a/plugins/MirOTR/libotr/read/COPYING +++ b/plugins/MirOTR/libotr/read/COPYING @@ -2,7 +2,7 @@ Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. - 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. @@ -305,7 +305,7 @@ the "copyright" line and a pointer to where the full notice is found. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add information on how to contact you by electronic and paper mail. diff --git a/plugins/MirOTR/libotr/read/COPYING.LIB b/plugins/MirOTR/libotr/read/COPYING.LIB index b1e3f5a263..a2f935aa90 100644 --- a/plugins/MirOTR/libotr/read/COPYING.LIB +++ b/plugins/MirOTR/libotr/read/COPYING.LIB @@ -2,7 +2,7 @@ Version 2.1, February 1999 Copyright (C) 1991, 1999 Free Software Foundation, Inc. - 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. @@ -485,7 +485,7 @@ convey the exclusion of warranty; and each file should have at least the You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add information on how to contact you by electronic and paper mail. diff --git a/plugins/MirOTR/libotr/read/ChangeLog b/plugins/MirOTR/libotr/read/ChangeLog index a919221785..c0da98b1d3 100644 --- a/plugins/MirOTR/libotr/read/ChangeLog +++ b/plugins/MirOTR/libotr/read/ChangeLog @@ -1,3 +1,442 @@ +2015-02-08 + + * Protocol-v3.html: Typo fixes, thanks to Hannes Mehnert + <hannes@mehnert.org> and Nadim Kobeissi <nadim@nadim.computer> + for the reports. + + * src/message.c: Be stricter about parsing v3 fragments. Thanks + to Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com> for + the report. + +2014-12-18 + + * Protocol-v3.html: Remove "sender_instance, receiver_instance," + from description of v2 fragmentation and clarify that you can't + fragment a fragment. Thanks to Hannes Mehnert + <hannes@mehnert.org> for the report. + + * Protocol-v3.html: Remove a stray "DRAFT" from the <title> tag. + + * Protocol-v2.html: + * Protocol-v3.html: Clarify the DSA computation in the protocol + specs. Thanks to Adam Langley <agl@imperialviolet.org> and + Hannes Mehnert <hannes@mehnert.org> for the report. + +2014-11-29 + + * README: + * Makefile.am: + * configure.ac: + * tests/*: Brand new testsuite, thanks to + David Goulet <dgoulet@ev0ke.net> and + Julien Voisin <julien.voisin@dustri.org>. + "make check" to run it. + +2014-11-11 + + * b64.c (otrl_base64_otr_encode): In case some future code path + tries to call otrl_base64_otr_encode with a buffer more than + 3/4 the size of all addressable memory, return NULL rather than + causing an integer overflow and a heap overrun. Thanks to + David Remahl <david@remahl.se> for the report. + * proto.c (otrl_proto_create_data): Tiny refactor to call + otrl_base64_otr_encode instead of duplicating the code here. + +2014-10-18 + + * README: + * configure.ac: + * src/version.h: Bump version number to 4.1.0 + +2014-10-18 + + * Protocol-v3.html: Correctly count the number of actions an OTR + client must handle. Thanks to Fred Yontz <fred@ridersite.org> + for the report. + +2014-10-13 + + * src/context.h: Add API functions + otrl_context_find_recent_instance and + otrl_context_find_recent_secure_instance. + +2014-10-13 + + * src/context.c (otrl_context_forget): Correct check for + children contexts' state being OTRL_MSGSTATE_PLAINTEXT. Thanks + to k007k <k007k@wp.pl> for the report. + +2014-10-13 + + * src/message.c (otrl_message_receiving): Fix memory leak in + fragment reassembly. Thanks to Matthew D. Green + <matthewdgreen@gmail.com> for the report and David Goulet + <dgoulet@ev0ke.net> for the patch. + +2014-10-13 + + * src/message.c (otrl_message_sending): Fix possible memory + leak. + +2014-07-13 + + * src/auth.c (otrl_auth_handle_commit): Add a clarifying + comment. + +2014-06-12 + + * src/message.h: Typo fix. + +2014-06-03 + + * Makefile.am: + * configure.ac: Modernize autoconf build system. Thanks to + David Goulet <dgoulet@ev0ke.net> for the patch. + +2014-05-22 + + * README: + * src/context.c: Typo fixes. + +2014-05-04 + + * INSTALL: + * bootstrap: Add bootstrap script to set up the build system. + Thanks to David Goulet <dgoulet@ev0ke.net> for the patch. + +2014-05-04 + + * src/dh.c: + * src/sm.c: + * toolkit/sesskeys.c: Use gcrypt secure memory allocation. + Thanks to Julien Voisin <julien.voisin@dustri.org> for the + patch. + +2014-04-21 + + * src/mem.c (otrl_mem_differ): Simplify otrl_mem_differ. Thanks + to Julien Voisin <julien.voisin@dustri.org> for the patch. + +2014-02-20 + + * src/proto.c (otrl_proto_instance): Fix a memory leak when + receiving an invalid instance tag. Thanks to Julien Voisin + <julien.voisin@dustri.org> for the patch. + +2014-02-15 + + * src/proto.c: + * src/auth.c: + * src/mem.c: + * src/mem.h: Use a constant-time memory comparison for safety. + Thanks to jvoisin <julien.voisin@dustri.org> for the suggestion. + +2013-10-13 + + * src/proto.c: Return 0 instead of crashing from + otrl_proto_query_bestversion if passed an illegal input. + Thanks to Conrad Hoffmann <ch@bitfehler.net> for the report and + the patch. + +2013-08-21 + + * src/proto.c: Fix warning from clang in proto.c. Before, trying + to fragment a message into more than 65535 pieces would cause + incorrect fragments to be output. Now, it just returns an error + (as that is disallowed by the spec). Thanks to Teemu Huovila + <thuovila@cs.helsinki.fi> for reporting the issue. + +2013-08-08 + + * Protocol-v3.html: Random exponents in SMP should be 1536 bits. + The spec (but not the code) incorrectly said "128 bits" before. + +2013-07-28 + + * packaging/fedora/libotr.spec: Fedora spec file for 4.x from + Paul Wouters <paul@cypherpunks.ca> + +2013-07-17 + + * toolkit/sesskeys.c: Workaround for a crash bug in libgcrypt + affecting otr_sesskeys. Passing a private key value of 0 to + otr_sesskeys would cause libgcrypt to crash in gcry_mpi_powm. + We reported this libgcrypt bug and it was then fixed in + http://lists.gnupg.org/pipermail/gcrypt-devel/2013-July/002251.html + but the workaround is simply to use + gcry_mpi_new(DH1536_MOD_LEN_BITS) instead of gcry_mpi_new(0). + Note that this only affected the otr_sesskeys toolkit program, + and not libotr itself. + Thanks to the Mayhem Team at CMU (Alexandre Rebert, Thanassis + Avgerinos, Sang Kil Cha, David Brumley, Manuel Egele) for the + report. + +2013-01-19 + + * src/message.c: pass opdata when sending message fragment + The inject_message callback was missing the opdata when sending + message fragments. Thanks to David Goulet <dgoulet@ev0ke.net> + for the report. + +2012-12-18 + + * src/message.c: Copy lastmessage to the newly created context. + This fixes a case where the first user message gets lost when + OTRL_POLICY_REQUIRE_ENCRYPTION policy is set because after + establishing the encryption lastmessage remains with the master + context and will not be resent. Thanks to Andreas Schlick + <schlick@lavabit.com> for the report. + +2012-09-09 + + * configure.ac: Make linker hardening [DEP, ALSR] work on + Windows builds. Thanks to Daniel Atallah <datallah@pidgin.im> + for noticing that it wasn't working before. + +2012-09-04 + + * README: Release 4.0.0 + +2012-08-28 + + * UPGRADING: + * src/proto.h: + * src/proto.c: Don't have otrl_init call exit(1) if the + application's requested version number differs from libotr's. + Rather, return a non-zero error code, and have the application + clean up gracefully. The OTRL_INIT macro now checks the error + code and does an exit(1) as the default behaviour, but the + application can do what it likes. + +2012-08-27 + + * src/auth.h: + * src/auth.c: + * src/message.c: Record the time the last COMMIT was sent from a + master context. This will be used to clear the committed key + from the master context once we don't expect any more instances + of our buddy to respond with a DHKEY message. + + * UPGRADING: + * src/userstate.h: + * src/userstate.c: + * src/message.h: + * src/message.c: Add a timer_control callback to + OtrlMessageAppOps in order to actually clear out the above stale + committed keys. + +2012-08-26 + + * src/context.c: + * src/context_priv.c: + * src/context_priv.h: libotr was exporting exactly two functions + without the otrl_ prefix: context_priv_new and + context_priv_force_finished. Change the names of these + functions to start with otrl_. Thanks to David Goulet + <dgoulet@ev0ke.net> for noticing it. + + * Protocol-v3.html: Document the v3 whitespace tag, and better + document the extra symmetric key. Thanks to Kjell Braden + <kb@pentabarf.de> for noticing the omission. + +2012-08-25 + + * src/sm.c: + * src/context.c: + * src/auth.c: + * src/message.c: If OTRL_DEBUGGING is non-zero, then a message + containing a special debug string ("?OTR!") will cause debug + info to be printed to stderr. (This #define should *not* be set + in release code.) + + * src/auth.c: + * src/auth.h: + * src/message.c: Correct the logic for handling incoming COMMIT + messages when we've recently sent our own COMMIT message. + + * src/message.c: Don't update the recent_sent_child field to + point to the master context just becuase we sent a version 3 + COMMIT message (which has no destination instance). + +2012-08-24 + + * README: + * configure.ac: Prepare for release 4.0.0 + +2012-08-24 + + * src/message.c: Consider copying the master auth context to the + child, even if the child is already in ENCRYPTED, because we + might be trying to refresh a private conversation. + +2012-08-22 + + * configure.ac: Use gcc and ld hardening flags, where possible. + * configure.ac: + * src/auth.c: + * src/dh.c: + * src/mem.c: + * src/privkey.c: + * src/proto.c: + * src/sm.c: + * toolkit/sesskey.c: Build cleanly with -Wall -Wextra + -Wformat-security -Wno-unused-parameter + +2012-08-17 + + * src/message.c: Don't call memchr(foo,'\0',-1) even if it has + no ill effects. Thanks to George Kadianakis + <desnacked@riseup.net> for the report. + +2012-07-20 + + * src/message.c, src/instag.c, toolkit/parse.c, src/sm.c, + src/proto.c, src/privkey.c, src/auth.c, src/context.[ch]: + Fix some memory leaks, some NULL pointer handling, and + compilation warnings. Thanks to Paul Wouters + <pwouters@redhat.com> for the report. + + * src/message.c: Better handling of OTRv3 fragments. + +2012-07-19 + + * src/b64.[ch], src/proto.c, toolkit/parse.c: Clean up the + previous b64 patch and apply it to all places where + otrl_base64_decode() is called. + +2012-07-17 + + * src/b64.c: Use ceil instead of floor to compute the size + of the data buffer. This prevents a one-byte heap buffer + overflow. Thanks to Justin Ferguson <jnferguson@gmail.com> + for the report. + +2012-06-21 + + * src/context.c: A couple bug fixes. + * Release 4.0.0-beta2 + +2012-06-07 + + * Release 4.0.0-beta1 + +2012-05-08: + + * src/instag.c: + * src/message.c: Returning proper gcry types to avoid + compile warnings. + +2012-05-03: + + * src/instag.c: Fixed otrl_instag_new(). + +2012-04-30: + + * AUTHORS: + * README: + * toolkit/otr_parse.c: + * toolkit/otr_remac.c: + * toolkit/parse.c: + * toolkit/parse.h: + * src/auth.c: + * src/auth.h: + * src/context.c: + * src/context.h: + * src/message.c: + * src/message.h: + * src/privkey.c: + * src/privkey.h: + * src/proto.c: + * src/proto.h: + * src/serial.h: + * src/tests.c: + * src/userstate.c: + * src/userstate.h: More changes for instance tags (Rob Smits). + +2009-06-11: + + * src/auth.c: + * src/auth.h: + * src/context.c: + * src/context.h: + * src/context_priv.h: + * src/message.c: + * src/message.h: + * src/privkey.c: + * src/privkey.h: + * src/proto.c: + * src/proto.h: + * src/serial.h: + * src/tests.c: + * src/userstate.c: + * src/userstate.h: Core instance tag functionality (Lisa Du). + +2009-09-30: + + * Protocol-v2.html: Edits from Göran Weinholt + <goran@weinholt.se> + +2009-04-28: + + * src/auth.c: pubkey_type should be shifted by 8, not 16. It + doesn't matter right now, because it's always 0, but still. + (Thanks to Can Tang.) + +2008-08-15: + + * src/Makefile.am: + * src/context.c: + * src/context.h: + * src/context_priv.c: + * src/context_priv.h: + * src/message.c: + * src/message.h: + * src/proto.c: + * src/proto.h: Willy Lew's updates of the libotr API + +2008-08-06: + + * src/proto.c: gcc 4.2 with -O2 assumes that integer overflow + never occurs when optimizing away tests, including those for + integer overflow. The code was made more specific. + +2008-07-09: + + * src/privkey.h: + * src/privkey.c: Add otrl_privkey_generate_cancel to handle the + case that the background key generation thread is cancelled or + fails. + +2008-07-06: + + * configure.ac: Update libtool version to match 4.0.0. + + * src/privkey-t.h: + * src/privkey.c: + * src/privkey.h: + * src/userstate.c: + * src/userstate.h: Support for generating privkeys in a + background thread. + +2008-07-02: + + * version.h: Change version number to 4.0.0 (but still far from + release). + + * tlv.h: + * proto.h: + * proto.c: + * message.h: + * message.c: + * dh.h: + * dh.c: Support for applications requesting an extra session key + that can be used for things like file transfers. + + * message.h: + * message.c: Applications now use the handle_smp_event callback + to handle SMP events, rather than having to hardcode part of the + SMP state machine themselves. + 2008-06-15: * README: Release version 3.2.0. diff --git a/plugins/MirOTR/libotr/read/INSTALL b/plugins/MirOTR/libotr/read/INSTALL index 9a7a433d6d..4226b2f44d 100644 --- a/plugins/MirOTR/libotr/read/INSTALL +++ b/plugins/MirOTR/libotr/read/INSTALL @@ -18,7 +18,7 @@ COMPILING If you're got a CVS copy, you will need to regenerate the configure script using: - autoreconf -s -i + ./bootstrap Once you have the configure script (which comes with the source deistribution), run it with the "--with-pic" option, as well as any @@ -32,7 +32,7 @@ NETBSD: ./configure --with-pic --prefix=/usr/pkg mingw cross-compiler from Debian Linux: - ./configure --with-pic --build=`./config.guess` --host=i586-mingw32msvc \ + ./configure --with-pic --host=i586-mingw32msvc \ --prefix=/usr/i586-mingw32msvc Once the configure script writes a Makefile, you should be able to just diff --git a/plugins/MirOTR/libotr/read/Makefile.am b/plugins/MirOTR/libotr/read/Makefile.am deleted file mode 100644 index a8c925c005..0000000000 --- a/plugins/MirOTR/libotr/read/Makefile.am +++ /dev/null @@ -1,9 +0,0 @@ -SUBDIRS = src toolkit - -EXTRA_DIST = Protocol-v2.html UPGRADING packaging libotr.m4 libotr.pc.in - -aclocaldir = $(datadir)/aclocal -aclocal_DATA = libotr.m4 - -pkgconfigdir = $(libdir)/pkgconfig -pkgconfig_DATA = libotr.pc diff --git a/plugins/MirOTR/libotr/read/Makefile.in b/plugins/MirOTR/libotr/read/Makefile.in deleted file mode 100644 index f3c832dfe1..0000000000 --- a/plugins/MirOTR/libotr/read/Makefile.in +++ /dev/null @@ -1,672 +0,0 @@ -# Makefile.in generated by automake 1.9.6 from Makefile.am. -# @configure_input@ - -# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, -# 2003, 2004, 2005 Free Software Foundation, Inc. -# This Makefile.in is free software; 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Added API functions otrl_context_find_recent_instance and + otrl_context_find_recent_secure_instance. + +24 Aug 2012: +- Release 4.0.0 +- Support v3 of the OTR protocol +- The main new feature: sensibly handle the case where a user is logged + in multiple times to the same IM account +- API changes: + - instance tags, to support multiple simultaneous logins + - support for asynchronous private key generation + - the ability to provide an "extra" symmetric key to applications + (with forward secrecy) + - applications can supply a formation conversion callback if they do + not natively use XHTML-style UTF8 markup + - error messages formerly provided by libotr are now handled using + callbacks to the application, for better i18n support + - otrl_message_sending now handles message fragmentation internally + 27 May 2008: - Added support for one-way authentication using an explicit question, based on the SOUPS 2008 user study. diff --git a/plugins/MirOTR/libotr/read/Protocol-v1.txt b/plugins/MirOTR/libotr/read/Protocol-v1.txt new file mode 100644 index 0000000000..27429bb76d --- /dev/null +++ b/plugins/MirOTR/libotr/read/Protocol-v1.txt @@ -0,0 +1,625 @@ + Off-The-Record Wire Protocol Documentation + ------------------------------------------ + + Nikita Borisov and Ian Goldberg + <otr@cypherpunks.ca> + +Definitions +----------- + +Data encodings: + + Bytes (BYTE): + 1 byte unsigned value + Shorts (SHORT): + 2 byte unsigned value, big-endian + Ints (INT): + 4 byte unsigned value, big-endian + Multi-precision integers (MPI): + 4 byte unsigned len, big-endian + len byte unsigned value, big-endian + (MPIs must use the minimum-length encoding; i.e. no leading 0x00 + bytes. This is important when calculating public key fingerprints.) + Opaque variable-length data (DATA): + 4 byte unsigned len, big-endian + len byte data + DSA signature (DSASIG): + (len is the length of the DSA public parameter q) + len byte unsigned r, big-endian + len byte unsigned s, big-endian + Initial CTR-mode counter value (CTR): + 8 bytes data + Message Authentication Code (MAC): + 20 bytes MAC data + +Policies: + + Clients can set one of four OTR policies. This can be done either + on a per-correspondent basis, or globally, or both. The policies + are: + + NEVER: + Never perform OTR with this correspondent. + MANUAL: + Only start OTR if one of you specifically requests it. + OPPORTUNISTIC: + Start OTR if there's any indication the correspondent supports it. + ALWAYS: + Only use OTR with this correspondent; it is an error to send an + unencrypted message to him. + + The default setting should be OPPORTUNISTIC. + +Whitespace Tag: + + There is an OTR_MESSAGE_TAG, which is a 24-byte string of whitespace + that clients can optionally append to (or insert in) messages to + unobtrusively indicate that they understand the OTR protocol. The + string is as follows (in C notation): + + \x20\x09\x20\x20\x09\x09\x09\x09 + \x20\x09\x20\x09\x20\x09\x20\x20 + \x20\x09\x20\x09\x20\x20\x09\x20 + + [This is the bit pattern of the string "OTR" as expressed in spaces and + tabs.] + +Protocol +-------- + +An OTR client maintains a separate state with each of its +correspondents. Initially, all correspondents start in the UNCONNECTED +state. + +This is the state machine for the default (OPPORTUNISTIC) policy. The +modifications for other policies are below. + +In the UNCONNECTED state: + + - It may, at the user's instigation or otherwise (for example, if the + correspondent's AIM Capability list indicates he supports OTR), send + an OTR Query message, and remain in the UNCONNECTED state. + + - If it receives an OTR Query message, it replies with an OTR Key + Exchange message, and moves to the SETUP state. + + - If it receives an OTR Key Exchange message, it: + - verifies the information in the Key Exchange message + - If the verification fails, send an OTR Error message, and remain + in the UNCONNECTED state. + - If the verification succeeds, reply with an OTR Key Exchange + message with the Reply field set to 0x01 (_even if_ the received + Key Exchange message itself had the Reply field set), inform the + user that private communication has been established, and move to + the CONNECTED state. + + - If it receives an OTR Data message, it replies with an OTR Error + message, sends a Key Exchange message (with Reply set to 0x00), and + moves to the SETUP state. + + - If it receives an OTR Error message, it should display the message to + the user, send a Key Exchange message (with Reply set to 0x00), and + move to the SETUP state. + + - If it receives an non-OTR message: + - If the message contains the OTR_MESSAGE_TAG, it should reply with + an OTR Key Exchange message, strip the OTR_MESSAGE_TAG from the + message, display the message to the user, and move to the SETUP state. + - Otherwise, it should display the message to the user, and remain in + the UNCONNECTED state. + +In the SETUP state: + + - The user, through a UI action, may elect to reset the connection + to the UNCONNECTED state. + + - If it receives an OTR Query message, it replies with an OTR Key + Exchange message, and remains in the SETUP state. + + - If it receives an OTR Key Exchange message, it: + - verifies the information in the Key Exchange message + - If the verification fails, send an OTR Error message, display a + notice of the error to the user, and remain in the SETUP state. + - If the verification succeeds: + - If the received Key Exchange message did not have the Reply field + set to 0x01, reply with an OTR Key Exchange (with the Reply field + set to 0x01). + - In any event, inform the user that private communication has + been established, and move to the CONNECTED state. + + - If it receives an OTR Data message, it replies with an OTR Error + message, sends a Key Exchange message (with Reply set to 0x00), and + remains in the SETUP state. + + - If it receives an OTR Error message, it should display the message to + the user, send a Key Exchange message (with Reply set to 0x00), and + remain in the SETUP state. + + - If it receives an non-OTR message: + - If the message contains the OTR_MESSAGE_TAG, it should reply with + an OTR Key Exchange message, and strip the OTR_MESSAGE_TAG from the + message, display the message to the user, and remain to the SETUP state. + - Otherwise, it should display the message to the user, and remain + in the SETUP state. + +In the CONNECTED state: + + - The user, through a UI action, may elect to reset the connection + to the UNCONNECTED state. + + - If it receives an OTR Query message, it replies with an OTR Key + Exchange message, and remains in the CONNECTED state. + + - If it receives an OTR Key Exchange message, it: + - verifies the information in the Key Exchange message + - If the verification fails, send an OTR Error message, display a + notice of the error to the user, and remain in the CONNECTED + state. + - If the verification succeeds: + - If the received Key Exchange message did not have the Reply field + set to 0x01, reply with an OTR Key Exchange (with the Reply field + set to 0x01). + - In any event, remain in the CONNECTED state. + + - If it receives an OTR Data message, it: + - verifies the information in the Data message + - If the verification fails, send an OTR Error message, display a + notice of the error to the user, and remain in the CONNECTED + state. + - If the verification succeeds, display the (decrypted) message to + the user, and remain in the CONNECTED state. + + - If it receives an OTR Error message, it should display the message to + the user, and remain in the CONNECTED state. + + - If it receives an non-OTR message, it should reply with an OTR Error + message, and remain in the CONNECTED state. + +Other policies: + + The above decribes what to do in the default (OPPORTUNISTIC) policy. + + If the policy is NEVER: behave as if OTR is not enabled at all. + Pass all received messages to the user, and send all of the user's + messages out untouched. + + If the policy is MANUAL: never send the OTR_MESSAGE_TAG in messages, + and never respond to one you receive. Don't send a Key Exchange + Message (or change state) in response to receiving a Data or Error + Message in the UNCONNECTED or SETUP states. + + If the policy is ALWAYS: never send an unencrypted message. Either + report an error to the user, or else hold on to the message, send an + OTR Query Message instead, and once you enter the CONNECTED state, + send the original message. Warn the user if you receive an + unencrypted message. + +Protocol messages +----------------- + +There are four types of messages in the OTR protocol: + - OTR Query + - OTR Key Exchange + - OTR Data + - OTR Error + +OTR Query +--------- + +This message is sent to inquire if the correspondent supports the OTR +protocol. + +Format: + +Any message containing the string "?OTR?" is considered an OTR Query. + +Since this message will be visible to the correspondent in the event +that he does not support the OTR protocol, it may also contain +human-readable information after this initial string. + +Example: + +?OTR?\nYour client does not support the OTR Private Messaging +Protocol.\nSee https://otr.cypherpunks.ca/ for more information. + +OTR Key Exchange +---------------- + +This message is sent to inform the correspondent of your public +signature key, and your current DH encryption key. + +Format: + +The message must contain the five bytes "?OTR:". After that is the +base-64 encoding of the following, followed by the byte ".": + + - Protocol version (SHORT) + - The version number of this protocol is 0x0001. + - Message type (BYTE) + - OTR Key Exchange has message type 0x0a. + - Reply (BYTE) + - 0x01 if this Key Exchange message is being sent in reply to a Key + Exchange message that was just received. 0x00 otherwise. + - DSA p (MPI) + - DSA q (MPI) + - DSA g (MPI) + - DSA e (MPI) + - The DSA public key (p,q,g,e). + [The parameter 'e' is usually called 'y', but that name's taken by + the DH public key, below.] + - Sender keyid (INT) + - The keyid for this initial key. Must be greater than 0. + - DH y (MPI) + - The initial DH public encryption key. The DH group is the one + defined in RFC 3526 with 1536-bit modulus (hex, big-endian): + FFFFFFFF FFFFFFFF C90FDAA2 2168C234 C4C6628B 80DC1CD1 + 29024E08 8A67CC74 020BBEA6 3B139B22 514A0879 8E3404DD + EF9519B3 CD3A431B 302B0A6D F25F1437 4FE1356D 6D51C245 + E485B576 625E7EC6 F44C42E9 A637ED6B 0BFF5CB6 F406B7ED + EE386BFB 5A899FA5 AE9F2411 7C4B1FE6 49286651 ECE45B3D + C2007CB8 A163BF05 98DA4836 1C55D39A 69163FA8 FD24CF5F + 83655D23 DCA3AD96 1C62F356 208552BB 9ED52907 7096966D + 670C354E 4ABC9804 F1746C08 CA237327 FFFFFFFF FFFFFFFF + and generator 2. + - Signature (DSASIG) + - A signature with the private DSA key corresponding to (p,q,g,e). + Take a SHA-1 hash of everything from the protocol version to the + end of the value of y, and sign that value. + + The DSA key given in this message has a "Fingerprint", which is the + SHA-1 hash of the portion of the message from the beginning of the "p" + field (including the MPI length) to the end of the "e" field. This + fingerprint should be displayed to the recipient so that he may verify + the sender's key. + +OTR Data +-------- + +This message is used to transmit a private message to the correspondent. +It is also used to reveal old MAC keys. + +The plaintext message (either before encryption, or after decryption) +consists of a human-readable message, optionally followed by: + - a single NUL (a BYTE with value 0x00) + AND + - zero or more TLV (type/length/value) records (with no padding + between them) + +Each TLV record is of the form: + - Type (SHORT) + - The type of this record. Records with unrecognized types should + be ignored. + - Length (SHORT) + - The length of the following field + - Value (len BYTEs) [where len is the value of the Length field] + - Any pertinent data for the record type. + +Some TLV examples: + + \x00\x01\x00\x00 + A TLV of type 1, containing no data + + \x00\x00\x00\x05\x68\x65\x6c\x6c\x6f + A TLV of type 0, containing the value "hello" + +The currently defined TLV record types are: + + Type 0: Padding + The value may be an arbitrary amount of data, which should be + ignored. This type can be used to disguise the length of the + plaintext message. + + Type 1: Disconnected + If the user requests to close the private connection, you may + send a message (possibly with empty human-readable part) + containing a record with this TLV type just before you discard + the session keys. If you receive a TLV record of this type, + you may inform the user that his correspondent has closed his + end of the private connection, and the user should do the same. + +Format: + +The message must contain the five bytes "?OTR:". After that is the +base-64 encoding of the following, followed by the byte ".": + + - Protocol version (SHORT) + - The version number of this protocol is 0x0001. + - Message type (BYTE) + - OTR Data has message type 0x03. + - Sender keyid (INT) + - Must be strictly greater than 0, and increment by 1 with each key + change + - Recipient keyid (INT) + - Must therefore be strictly greater than 0, as the receiver has no + key with id 0 + - The sender and recipient keyids are those used to encrypt and MAC + this message. + - DH y (MPI) + - The *next* [i.e. sender_keyid+1] public key for the sender + - Top half of counter init (CTR) + - This should monotonically increase (as a big-endian value) for + each message sent with the same (sender keyid, recipient keyid) + pair , and must not be all 0x00. + - Encrypted message (DATA) + - Using the appropriate encryption key (see below) derived from the + sender's and recipient's DH public keys (with the keyids given in + this message), perform AES128 counter-mode (CTR) encryption of the + message. The initial counter is a 16-byte value whose first 8 + bytes are the above "top half of counter init" value, and whose + last 8 bytes are all 0x00. Note that counter mode does not change + the length of the message, so no message padding needs to be done. + If you *want* to do message padding (to disguise the length of + your message), pad with NULs (bytes of 0x00). Upon receiving + and successfully decrypting an OTR Data Message, the decrypted + payload should be truncated just before the first NUL (if any). + - SHA1-HMAC, using the appropriate MAC key (see below) of everything + from the Protocol version to the end of the encrypted message (MAC) + - Old MAC keys to be revealed (DATA) + - See "Revealing MAC Keys", below. + +OTR Error +--------- + +This message is sent when a problem has occurred in the protocol. + +Format: + +Any message containing "?OTR Error:" is an OTR Error message. The +following part of the message should contain human-readable details of +the error. + +Key Management +-------------- + +For each correspondent, keep track of: + - My two most recent DH public/private key pairs + - our_dh[our_keyid] (most recent) and our_dh[our_keyid-1] (previous) + - His two most recent DH public keys + - their_y[their_keyid] (most recent) and their_y[their_keyid-1] (previous) + +When starting a private conversation with a correspondent, generate +two DH key pairs for yourself, and set our_keyid = 2. Note that all DH +key pairs should have a private part that is at least 320 bits long. + +When you send an OTR Key Exchange message: + Send the public part of our_dh[our_keyid-1], with the keyid field, + of course, set to (our_keyid-1). + +When you receive an OTR Key Exchange message: + If the specified keyid equals either their_keyid or their_keyid-1, + and the DH pubkey contained in the Key Exchange message matches the + one we've stored for that keyid, that's great. Otherwise, forget + all values of their_y[], and of their_keyid, and set their_keyid to + the keyid value given in the Key Exchange message, and + their_y[their_keyid] to the DH pubkey value given in the Key + Exchange message. their_y[their_keyid-1] should be set to NULL. + + In any event, if the Reply field of the Key Exchange message was set + to 0x00, send a Key Exchange message with the Reply field set to + 0x01. + +When you send an OTR Data message: + Set the sender keyid to (our_keyid-1), and the recipient keyid to + (their_keyid). Set the DH pubkey in the Data message to the public + part of our_dh[our_keyid]. Use our_dh[our_keyid-1] and + their_y[their_keyid] to calculate session keys, as outlined below. + Use the "sending AES key" to encrypt the message, and the "sending + MAC key" to calculate its MAC. + +When you receive an OTR Data message: + Use the keyids in the message to select which of your DH key pairs + and which of his DH pubkeys to use to verify the MAC. If the keyids + do not represent either the most recent key or the previous key (for + either the sender or receiver), reject the message. Also reject the + message if the sender keyid is their_keyid-1, but + their_y[their_keyid-1] is NULL. + + Otherwise, calculate the session keys as outlined below. Use the + "receiving MAC key" to verify the MAC on the message. If it does not + verify, reject the message. + + Check that the counter in the Data message is strictly larger than the + last counter we saw using this pair of keys. If not, reject the + message. + + If the MAC verifies, decrypt the message using the "receiving AES key". + + Finally, check if keys need rotation: + - If the "recipient keyid" in the Data message equals our_keyid, then + he's seen the public part of our most recent DH key pair, so we + securely forget our_dh[our_keyid-1], increment our_keyid, and set + our_dh[our_keyid] to a new DH key pair which we generate. + - If the "sender keyid" in the Data message equals their_keyid, + increment their_keyid, and set their_y[their_keyid] to the new DH + pubkey specified in the Data message. + + If the message you get after decryption is of zero length, this is a + "heartbeat" packet. Don't display it to the user. (But it's still + useful to effect key rotations.) + +Calculating session keys: + Given one of our DH key pairs, and one of his DH pubkeys, we + calculate a DH secure id, two AES keys, and two MAC keys as follows: + + Let (our_x, our_y) be the private and public parts of our DH + key pair. Let their_y be his DH pubkey. + + First, calculate the shared secret: + secret = their_y ^ our_x mod DH_MODULUS + (^ denotes exponentiation, and DH_MODULUS is the 1536-bit DH modulus + from RFC 3526, as specified above). + + Write the value of secret as a minimum-length MPI, as specific above + (4-byte big-endian len, len-byte big-endian value). Let this + (4+len)-byte value be "secbytes". + + Next, determine if we are the "low" end or the "high" end of this + key exchange. If our_y > their_y, then we are the "high" end. + Otherwise, we are the "low" end. Note that who is the "low" end and + who is the "high" end can change every time a new DH pubkey is + exchanged. + + Calculate the DH secure id as the SHA-1 hash of the (5+len)-byte value + composed of the byte 0x00, followed by the (4+len) bytes of + secbytes. + + When a new private connection is established, the "secure session + id" for the connection is set to be the DH secure id calculated in + this way. + + The secure session id should be displayed as two 10-byte + (big-endian) values, in C "%20x" format. If we are the "low" end of + the key exchange, display the first 10 bytes in bold, and the second + 10 bytes in non-bold. If we are the "high" end of the key exchange, + display the first 10 bytes in non-bold, and the second 10 bytes in + bold. This session id can be used by the parties to verify (say, + over the telephone, assuming the parties recognize each others' + voices) that there is no man-in-the-middle by having each side read + his bold part to the other. + + To be clear, if the user requests to see the secure session id in + the middle of the conversation, the value displayed should be the + one calculated at the time the private connection was established + (the last Key Exchange Message that caused a rekeying), _not_ the DH + secure id calculated from DH keys in more recent Data Messages. + + Now set the values of "sendbyte" and "recvbyte" according to whether + we are the "low" or the "high" end of the key exchange: + - If we are the "high" end, set "sendbyte" to 0x01 and "recvbyte" + to 0x02. + - If we are the "low" end, set "sendbyte" to 0x02 and "recvbyte" + to 0x01. + + Calculate the "sending AES key" to be the first 16 bytes of the + SHA-1 hash of the (5+len)-byte value composed of the byte + (sendbyte), followed by the (4+len) bytes of secbytes. + + Calculate the "sending MAC key" to be all 20 bytes of the SHA-1 hash + of the 16-byte sending AES key. + + Calculate the "receiving AES key" to be the first 16 bytes of the + SHA-1 hash of the (5+len)-byte value composed of the byte + (recvbyte), followed by the (4+len) bytes of secbytes. + + Calculate the "receiving MAC key" to be all 20 bytes of the SHA-1 hash + of the 16-byte receiving AES key. + +Revealing MAC keys +------------------ + +Whenever you are about to forget either one of your old DH key pairs, or +one of your correspondent's old DH pubkeys, take all of the MAC keys +that were generated by that key (note that there are up to four: the +sending and receiving MAC keys produced by the pairings of that key with +each of two of the other side's keys; but note that you only need to +take MAC keys that were actually used to either create a MAC on a +message, or verify a MAC on a message), and put them (as a set of +concatenated 20-byte values) into the "Old MAC keys to be revealed" +section of the next Data message you send. We do this to allow the +forgeability of OTR transcripts: once the MAC keys are revealed, anyone +can modify an OTR message and still have it appear valid. But since we +don't reveal the MAC keys until their corresponding pubkeys are being +discarded, there is no danger of us accepting a message as valid which +uses a MAC key which has already been revealed. + +Fragments +--------- + +[Remember when reading this section that the network model assumes +in-order delivery, but that some messages may not get delivered at all +(for example, if the user disconnects). And, of course, there's the +possibility of an active attacker, who is allowed to perform a Denial of +Service attack, but not to learn contents of messages.] + +Transmitting Fragments: + + If you have information about the maximum size of message you are + able to send (the different IM networks have different limits), you + can fragment an OTR message as follows: + + - Start with the OTR message as you would normally transmit it. For + example, an OTR Data Message would start with "?OTR:AAED" and end + with ".". + - Break it up into sufficiently small pieces. Let the number of + pieces be (n), and the pieces be piece[1],piece[2],...,piece[n]. + - Transmit (n) messages with the following (printf-like) structure + (as k runs from 1 to n inclusive): + + "?OTR,%hu,%hu,%s," , k , n , piece[k] + + - Note that k and n are unsigned short ints (2 bytes), and each has + a maximum value of 65535. Also, each piece[k] must be non-empty. + +Receiving Fragments: + + If you receive a message containing "?OTR," (note that you'll need + to check for this _before_ checking for any of the other "?OTR:" + markers): + + - Parse it as the printf statement above into k, n, and piece. + - Let (K,N) be your currently stored fragment number, and F be your + currently stored fragment. [If you have no currently stored + fragment, then K = N = 0 and F = "".] + + - If k == 0 or n == 0 or k > n, discard this (illegal) fragment. + + - If k == 1: + - Forget any stored fragment you may have + - Store (piece) as F. + - Store (k,n) as (K,N). + + - If n == N and k == K+1: + - Append (piece) to F. + - Store (k,n) as (K,N). + + - Otherwise: + - Forget any stored fragment you may have + - Store "" as F. + - Store (0,0) as (K,N). + + After this, if N > 0 and K == N, treat F as the received message. + + If you receive an unfragmented message, forget any stored fragment + you may have, store "" as F and store (0,0) as (K,N). + +Example: + + Here is an OTR Key Exchange Message we would like to transmit over a + network with an unreasonably small maximum message size: + + ?OTR:AAEKAQAAAICGmmRMlmuq4gY7Ro0GiYAJKWwVZyITNyifFP9VRIVgyxxGxwV + bFjoGMhO9XE0xFisuO6M27DPkX7hCtIXZM2glDszmTklQO5hJPu0g/RgDZ84q0ee + Q5AvexW3Hmp/VHUPTpZfJPep/Ctiqn0oE2y/2yRPyYQjpZCL440sM5i7B1wAAABT + zzL9WbuaxOK8rfrtaw4Lx/iLxeQAAAIAWaGpchsVOV1D6xK5cS5QNANelTvyVHre + XPSRjU0NFKIHrNDiFwa8lXcIBH/E8MHoQDzw+J2AuU6MuICPT8GMJYBcSZq0OM7x + gmfNlt1viUXxJXbYRpD82ki7QsMA1I7aQo/OqMryKlW5W8UqEjVcCsTOjEyQphLY + ENG6St9+ivgAAAIBgUjzleG1+VYCXZszTj+x5gNNidVVNKI+MG5elHMcsg2Guef3 + DBYEsor6YGeqJLAfhk28Tg7tktMQwGN5GXR1ZNkwkoFIOyVRq3lfabfHtsTp+Hkx + 5e8OrhTZ1G+ScDeqYbbTtUj631LhXUoyp+7pllVtpyLgqk5z9JYu6Kw0ZkQAAAAE + AAADASZH/uq17EVRo6dBZIL12x9JLx4gpEjgovfNLoORa6E+sMMuG7Z+zfLQVodX + H5shi/dvPzwbVrA/Iw72XHSYtld8lK/FLtjsI5mzancvRAEs1ZDBoBJRLW1X54eF + HpN/peDi6fBbdXyGahWYyF9MCJxDFCRqAHvEMZbfdyEtkXbFUZM2lJM2SJJG9zGZ + LCvd2/gF/VOgMlvdus+8TFW0k7cBhAgm/rb+EUeovkWXy2BiVpInXKCCH+M6EVpU + YNG7BPtH44ABwUw6Y5n5sSb6dtout34NGz+dspXMajffkZxFOAcabRwKIpw==. + + We could fragment this message into (for example) three pieces: + + ?OTR,1,3,?OTR:AAEKAQAAAICGmmRMlmuq4gY7Ro0GiYAJKWwVZyITNyifFP9VRI + VgyxxGxwVbFjoGMhO9XE0xFisuO6M27DPkX7hCtIXZM2glDszmTklQO5hJPu0g/R + gDZ84q0eeQ5AvexW3Hmp/VHUPTpZfJPep/Ctiqn0oE2y/2yRPyYQjpZCL440sM5i + 7B1wAAABTzzL9WbuaxOK8rfrtaw4Lx/iLxeQAAAIAWaGpchsVOV1D6xK5cS5QNAN + elTvyVHreXPSRjU0NFKIHrNDiFwa8lXcIBH/E8MHoQDzw+J2AuU6MuICPT8GMJYB + cSZq0OM7xgmfNlt1viUXxJXbYRpD82ki7QsMA1I7aQo/OqMryKlW5W8UqEjVcCsT + OjEyQphLY, + + ?OTR,2,3,ENG6St9+ivgAAAIBgUjzleG1+VYCXZszTj+x5gNNidVVNKI+MG5elHM + csg2Guef3DBYEsor6YGeqJLAfhk28Tg7tktMQwGN5GXR1ZNkwkoFIOyVRq3lfabf + HtsTp+Hkx5e8OrhTZ1G+ScDeqYbbTtUj631LhXUoyp+7pllVtpyLgqk5z9JYu6Kw + 0ZkQAAAAEAAADASZH/uq17EVRo6dBZIL12x9JLx4gpEjgovfNLoORa6E+sMMuG7Z + +zfLQVodXH5shi/dvPzwbVrA/Iw72XHSYtld8lK/FLtjsI5mzancvRAEs1ZDBoBJ + RLW1X54eFHpN/peDi6fBbdXyGahWYyF9MCJxDFCRqAHvEMZbfdyEtkXbFUZM2lJM + 2SJJG9zGZ, + + ?OTR,3,3,LCvd2/gF/VOgMlvdus+8TFW0k7cBhAgm/rb+EUeovkWXy2BiVpInXKC + CH+M6EVpUYNG7BPtH44ABwUw6Y5n5sSb6dtout34NGz+dspXMajffkZxFOAcabRw + KIpw==., diff --git a/plugins/MirOTR/libotr/read/Protocol-v2.html b/plugins/MirOTR/libotr/read/Protocol-v2.html index 4411ec6187..33277ae3bc 100644 --- a/plugins/MirOTR/libotr/read/Protocol-v2.html +++ b/plugins/MirOTR/libotr/read/Protocol-v2.html @@ -189,7 +189,10 @@ run SMP to detect impersonation or man-in-the-middle attacks. As above, all exponentiations are done modulo a particular 1536-bit prime, and g<sub>1</sub> is a generator of that group. All sent values include zero-knowledge proofs that they were generated according to -this protocol, as indicated in the detailed description below.</p> +this protocol, as indicated in the detailed description below. +In the zero-knowledge proofs the D values are calculated modulo +q = (p - 1) / 2, where p is the same 1536-bit prime as elsewhere. +The random exponents are 1536-bit numbers.</p> <p>Suppose Alice and Bob have secret information x and y respectively, and they wish to know whether x = y. The Socialist Millionaires' Protocol allows them to compare x and y without revealing any other information @@ -385,7 +388,8 @@ types of keys produce signatures in different formats. The format for a signature made by a DSA public key is as follows:</p> <dl> <dt>DSA signature (SIG):</dt> -<dd> (len is the length of the DSA public parameter q) +<dd> (len is the length of the DSA public parameter q, which in +current implementations must be 20 bytes, or 160 bits) <br /> len byte unsigned r, big-endian <br /> len byte unsigned s, big-endian</dd> </dl> @@ -467,8 +471,8 @@ following data, using the key m1:<dl> <dt>keyid<sub>B</sub> (INT)</dt> <dt>sig<sub>B</sub>(M<sub>B</sub>) (SIG)</dt> <dd>This is the signature, using the private part of the key -pub<sub>B</sub>, of the 32-byte M<sub>B</sub> (which does not need to be -hashed again to produce the signature).</dd> +pub<sub>B</sub>, of the 32-byte M<sub>B</sub> (taken modulo q instead of +being truncated (as described in FIPS-186), and not hashed again).</dd> </dl></li> <li>Encrypt X<sub>B</sub> using AES128-CTR with key c and initial counter value 0.</li> @@ -646,7 +650,7 @@ information x and y respectively to check whether (x==y) without revealing any additional information about the secrets. The protocol used by OTR is based on the work of Boudot, Schoenmakers and Traore (2001). A full justification for its use in OTR is made by Alexander and Goldberg, -in a paper to be published this year. The following is a technical account +in a paper published in 2007. The following is a technical account of what is transmitted during the course of the protocol.</p> <h4>Secret information</h4> <p>The secret information x and y compared during this protocol contains @@ -774,10 +778,10 @@ to generate zero-knowledge proofs that this message was created honestly.</li> g<sub>3b</sub> = g<sub>1</sub><sup>b<sub>3</sub></sup></li> <li>Generate a zero-knowledge proof that the exponent b<sub>2</sub> is known by setting c2 = SHA256(3, g<sub>1</sub><sup>r2</sup>) and -D2 = r2 - b<sub>2</sub> c2.</li> +D2 = r2 - b<sub>2</sub> c2 mod q.</li> <li>Generate a zero-knowledge proof that the exponent b<sub>3</sub> is known by setting c3 = SHA256(4, g<sub>1</sub><sup>r3</sup>) and -D3 = r3 - b<sub>3</sub> c3.</li> +D3 = r3 - b<sub>3</sub> c3 mod q.</li> <li>Compute g<sub>2</sub> = g<sub>2a</sub><sup>b<sub>2</sub></sup> and g<sub>3</sub> = g<sub>3a</sub><sup>b<sub>3</sub></sup></li> <li>Compute P<sub>b</sub> = g<sub>3</sub><sup>r4</sup> and @@ -785,12 +789,12 @@ Q<sub>b</sub> = g<sub>1</sub><sup>r4</sup> g<sub>2</sub><sup>y</sup></li> <li>Generate a zero-knowledge proof that P<sub>b</sub> and Q<sub>b</sub> were created according to the protocol by setting cP = SHA256(5, g<sub>3</sub><sup>r5</sup>, g<sub>1</sub><sup>r5</sup> -g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP and D6 = r6 - y cP.</li> +g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP mod q and D6 = r6 - y cP mod q.</li> <li>Store the values of g<sub>3a</sub>, g<sub>2</sub>, g<sub>3</sub>, b<sub>3</sub>, P<sub>b</sub> and Q<sub>b</sub> for use later in the protocol.</li> <li>Send Alice a type 3 TLV (SMP message 2) containing g<sub>2b</sub>, -c2, d2, g<sub>3b</sub>, c3, d3, P<sub>b</sub>, Q<sub>b</sub>, cP, D5 +c2, D2, g<sub>3b</sub>, c3, D3, P<sub>b</sub>, Q<sub>b</sub>, cP, D5 and D6, in that order.</li> </ol> Set smpstate to SMPSTATE_EXPECT3.</dd> @@ -832,8 +836,8 @@ g<sub>2b</sub><sup>c2</sup>).</li> <li>Check that c3 = SHA256(4, g<sub>1</sub><sup>D3</sup> g<sub>3b</sub><sup>c3</sup>).</li> <li>Check that cP = SHA256(5, g<sub>3</sub><sup>D5</sup> -P<sub>b</sub><sup>cP</sup>, g<sub>2</sub><sup>d6</sup> -Q<sub>b</sub><sup>cP</sup>).</li> +P<sub>b</sub><sup>cP</sup>, g<sub>1</sub><sup>D5</sup> +g<sub>2</sub><sup>D6</sup> Q<sub>b</sub><sup>cP</sup>).</li> </ol> Create a type 4 TLV (SMP message 3) and send it to Bob: <ol> @@ -847,15 +851,15 @@ Q<sub>a</sub> = g<sub>1</sub><sup>r4</sup> g<sub>2</sub><sup>x</sup></li> <li>Generate a zero-knowledge proof that P<sub>a</sub> and Q<sub>a</sub> were created according to the protocol by setting cP = SHA256(6, g<sub>3</sub><sup>r5</sup>, g<sub>1</sub><sup>r5</sup> -g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP and D6 = r6 - x cP.</li> +g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP mod q and D6 = r6 - x cP mod q.</li> <li>Compute R<sub>a</sub> = (Q<sub>a</sub> / Q<sub>b</sub>) <sup>a<sub>3</sub></sup></li> <li>Generate a zero-knowledge proof that R<sub>a</sub> was created according to the protocol by setting cR = SHA256(7, g<sub>1</sub><sup>r7</sup>, (Q<sub>a</sub> / Q<sub>b</sub>)<sup>r7</sup>) and -D7 = r7 - a<sub>3</sub> cR.</li> +D7 = r7 - a<sub>3</sub> cR mod q.</li> <li>Store the values of g<sub>3b</sub>, (P<sub>a</sub> / P<sub>b</sub>), -(Q<sub>a</sub> / Q<sub>b</sub>) and R<sub>b</sub> for use later in the +(Q<sub>a</sub> / Q<sub>b</sub>) and R<sub>a</sub> for use later in the protocol.</li> <li>Send Bob a type 4 TLV (SMP message 3) containing P<sub>a</sub>, Q<sub>a</sub>, cP, D5, D6, R<sub>a</sub>, cR and D7 in that order.</li> @@ -890,8 +894,8 @@ to Bob.</dd> <dd>Verify Alice's zero-knowledge proofs for P<sub>a</sub>, Q<sub>a</sub> and R<sub>a</sub>: <ol> -<li>Check that cP = SHA256(5, g<sub>3</sub><sup>D5</sup> -P<sub>a</sub><sup>cP</sup>, g<sub>2</sub><sup>d6</sup> +<li>Check that cP = SHA256(6, g<sub>3</sub><sup>D5</sup> +P<sub>a</sub><sup>cP</sup>, g<sub>1</sub><sup>D5</sup> g<sub>2</sub><sup>D6</sup> Q<sub>a</sub><sup>cP</sup>).</li> <li>Check that cR = SHA256(7, g<sub>1</sub><sup>D7</sup> g<sub>3a</sub><sup>cR</sup>, (Q<sub>a</sub> / Q<sub>b</sub>)<sup>D7</sup> @@ -907,7 +911,7 @@ this message was created honestly.</li> <li>Generate a zero-knowledge proof that R<sub>b</sub> was created according to the protocol by setting cR = SHA256(8, g<sub>1</sub><sup>r7</sup>, (Q<sub>a</sub> / Q<sub>b</sub>)<sup>r7</sup>) and -D7 = r7 - b<sub>3</sub> cR.</li> +D7 = r7 - b<sub>3</sub> cR mod q.</li> <li>Send Alice a type 5 TLV (SMP message 4) containing R<sub>b</sub>, cR and D7 in that order.</li> </ol> @@ -976,14 +980,14 @@ was created according to the protocol.</li> g<sub>3a</sub> = g<sub>1</sub><sup>a<sub>3</sub></sup></li> <li>Generate a zero-knowledge proof that the exponent a<sub>2</sub> is known by setting c2 = SHA256(1, g<sub>1</sub><sup>r2</sup>) and -D2 = r2 - a<sub>2</sub> c2.</li> +D2 = r2 - a<sub>2</sub> c2 mod q.</li> <li>Generate a zero-knowledge proof that the exponent a<sub>3</sub> is known by setting c3 = SHA256(2, g<sub>1</sub><sup>r3</sup>) and -D3 = r3 - a<sub>3</sub> c3.</li> +D3 = r3 - a<sub>3</sub> c3 mod q.</li> <li>Store the values of x, a<sub>2</sub> and a<sub>3</sub> for use later in the protocol.</li> <li>Send Bob a type 2 TLV (SMP message 1) containing g<sub>2a</sub>, -c2, d2, g<sub>3a</sub>, c3 and D3 in that order.</li> +c2, D2, g<sub>3a</sub>, c3 and D3 in that order.</li> </ol> Set smpstate to SMPSTATE_EXPECT2.</dd> </dl> @@ -1076,7 +1080,7 @@ they each compute seven values based on s:</p> (4-byte big-endian len, len-byte big-endian value). Let this (4+len)-byte value be "secbytes".</li> <li>For a given byte b, define h2(b) to be the 256-bit output of the -SHA256 hash of the (5+len) bytes consisting of the byte b, followed by +SHA256 hash of the (5+len) bytes consisting of the byte b followed by secbytes.</li> <li>Let ssid be the first 64 bits of h2(0x00).</li> <li>Let c be the first 128 bits of h2(0x01), and let c' be the second diff --git a/plugins/MirOTR/libotr/read/Protocol-v3.html b/plugins/MirOTR/libotr/read/Protocol-v3.html new file mode 100644 index 0000000000..99c376b98b --- /dev/null +++ b/plugins/MirOTR/libotr/read/Protocol-v3.html @@ -0,0 +1,1705 @@ +<!DOCTYPE html +PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" +"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html><head> +<title>Off-the-Record Messaging Protocol version 3</title> +<style type="text/css"> + body { background: white; color: black } + h1 { text-align: center } + dd ul.note { list-style: none } + dl.doublespace dd { margin-bottom: 2ex } +</style> +</head><body> +<h1>Off-the-Record Messaging Protocol version 3</h1> +<p>This document describes version 3 of the Off-the-Record Messaging +protocol. The main changes over version 2 include:</p> +<ul> +<li>Both fragmented and unfragmented messages contain sender and +recipient instance tags. This avoids an issue on IM networks that +always relay all messages to all sessions of a client who is logged +in multiple times. In this situation, OTR clients can attempt to +establish an OTR session indefinitely if there are interleaving +messages from each of the sessions.</li> +<li>An extra symmetric key is derived during AKE. This may be used for +secure communication over a different channel (e.g., file transfer, +voice chat).</li> +</ul> +<h2>Very high level overview</h2> +<p>OTR assumes a network model which provides in-order delivery of +messages, but that some messages may not get delivered at all +(for example, if the user disconnects). There may be +an active attacker, who is allowed to perform a Denial of +Service attack, but not to learn the contents of messages.</p> +<ol> +<li>Alice signals to Bob that she would like (using an OTR Query Message) +or is willing (using a whitespace-tagged plaintext message) to use OTR +to communicate. Either mechanism should convey the version(s) of OTR +that Alice is willing to use.</li> +<li>Bob initiates the authenticated key exchange (AKE) with Alice. +Versions 2 and 3 of OTR use a variant of the SIGMA protocol as its AKE.</li> +<li>Alice and Bob exchange Data Messages to send information to each +other.</li> +</ol> +<h2>High level overview</h2> +<h3>Requesting an OTR conversation</h3> +<p>There are two ways Alice can inform Bob that she is willing to use +the OTR protocol to speak with him: by sending him the OTR Query Message, +or by including a special "tag" consisting of whitespace characters in +one of her messages to him. Each method also includes a way for Alice +to communicate to Bob which versions of the OTR protocol she is willing +to speak with him.</p> +<p>The semantics of the OTR Query Message are that Alice is +<em>requesting</em> that Bob start an OTR conversation with her (if, of +course, he is willing and able to do so). On the other hand, the +semantics of the whitespace tag are that Alice is merely +<em>indicating</em> to Bob that she is willing and able to have an OTR +conversation with him. If Bob has a policy of "only use OTR when it's +explicitly requested", for example, then he <em>would</em> start an OTR +conversation upon receiving an OTR Query Message, but <em>would not</em> +upon receiving the whitespace tag.</p> +<h3>Authenticated Key Exchange (AKE)</h3> +<p>This section outlines the version of the SIGMA protocol used as the +AKE. All exponentiations are done modulo a particular 1536-bit prime, +and g is a generator of that group, as indicated in the detailed +description below. Alice and Bob's long-term authentication public keys +are pub<sub>A</sub> and pub<sub>B</sub>, respectively.</p> +<p>The general idea is that Alice and Bob do an <em>unauthenticated</em> +Diffie-Hellman (D-H) key exchange to set up an encrypted channel, and +then do mutual authentication <em>inside</em> that channel.</p> +<p>Bob will be initiating the AKE with Alice.</p> +<ul> +<li>Bob: +<ol> +<li>Picks a random value r (128 bits)</li> +<li>Picks a random value x (at least 320 bits)</li> +<li>Sends Alice AES<sub>r</sub>(g<sup>x</sup>), HASH(g<sup>x</sup>)</li> +</ol></li> +<li>Alice: +<ol> +<li>Picks a random value y (at least 320 bits)</li> +<li>Sends Bob g<sup>y</sup></li> +</ol></li> +<li>Bob: +<ol> +<li>Verifies that Alice's g<sup>y</sup> is a legal value (2 <= +g<sup>y</sup> <= modulus-2)</li> +<li>Computes s = (g<sup>y</sup>)<sup>x</sup></li> +<li>Computes two AES keys c, c' and four MAC keys m1, m1', m2, m2' by +hashing s in various ways</li> +<li>Picks keyid<sub>B</sub>, a serial number for his D-H key +g<sup>x</sup></li> +<li>Computes M<sub>B</sub> = MAC<sub>m1</sub>(g<sup>x</sup>, g<sup>y</sup>, +pub<sub>B</sub>, keyid<sub>B</sub>)</li> +<li>Computes X<sub>B</sub> = pub<sub>B</sub>, keyid<sub>B</sub>, +sig<sub>B</sub>(M<sub>B</sub>)</li> +<li>Sends Alice r, AES<sub>c</sub>(X<sub>B</sub>), +MAC<sub>m2</sub>(AES<sub>c</sub>(X<sub>B</sub>))</li> +</ol></li> +<li>Alice: +<ol> +<li>Uses r to decrypt the value of g<sup>x</sup> sent earlier</li> +<li>Verifies that HASH(g<sup>x</sup>) matches the value sent earlier</li> +<li>Verifies that Bob's g<sup>x</sup> is a legal value (2 <= +g<sup>x</sup> <= modulus-2)</li> +<li>Computes s = (g<sup>x</sup>)<sup>y</sup> (note that this will be the +same as the value of s Bob calculated)</li> +<li>Computes two AES keys c, c' and four MAC keys m1, m1', m2, m2' by +hashing s in various ways (the same as Bob)</li> +<li>Uses m2 to verify MAC<sub>m2</sub>(AES<sub>c</sub>(X<sub>B</sub>))</li> +<li>Uses c to decrypt AES<sub>c</sub>(X<sub>B</sub>) to obtain +X<sub>B</sub> = pub<sub>B</sub>, keyid<sub>B</sub>, +sig<sub>B</sub>(M<sub>B</sub>)</li> +<li>Computes M<sub>B</sub> = MAC<sub>m1</sub>(g<sup>x</sup>, +g<sup>y</sup>, pub<sub>B</sub>, keyid<sub>B</sub>)</li> +<li>Uses pub<sub>B</sub> to verify sig<sub>B</sub>(M<sub>B</sub>)</li> + +<li>Picks keyid<sub>A</sub>, a serial number for her D-H key +g<sup>y</sup></li> +<li>Computes M<sub>A</sub> = MAC<sub>m1'</sub>(g<sup>y</sup>, g<sup>x</sup>, +pub<sub>A</sub>, keyid<sub>A</sub>)</li> +<li>Computes X<sub>A</sub> = pub<sub>A</sub>, keyid<sub>A</sub>, +sig<sub>A</sub>(M<sub>A</sub>)</li> +<li>Sends Bob AES<sub>c'</sub>(X<sub>A</sub>), +MAC<sub>m2'</sub>(AES<sub>c'</sub>(X<sub>A</sub>))</li> +</ol></li> +<li>Bob: +<ol> +<li>Uses m2' to verify MAC<sub>m2'</sub>(AES<sub>c'</sub>(X<sub>A</sub>))</li> +<li>Uses c' to decrypt AES<sub>c'</sub>(X<sub>A</sub>) to obtain +X<sub>A</sub> = pub<sub>A</sub>, keyid<sub>A</sub>, +sig<sub>A</sub>(M<sub>A</sub>)</li> +<li>Computes M<sub>A</sub> = MAC<sub>m1'</sub>(g<sup>y</sup>, +g<sup>x</sup>, pub<sub>A</sub>, keyid<sub>A</sub>)</li> +<li>Uses pub<sub>A</sub> to verify sig<sub>A</sub>(M<sub>A</sub>)</li> +</ol></li> +<li>If all of the verifications succeeded, Alice and Bob now know each +other's Diffie-Hellman public keys, and share the value s. Alice is +assured that s is known by someone with access to the private key +corresponding to pub<sub>B</sub>, and similarly for Bob.</li> +</ul> +<h3>Exchanging data</h3> +<p>This section outlines the method used to protect data being exchanged +between Alice and Bob. As above, all exponentiations are done modulo +a particular 1536-bit prime, and g is a generator of +that group, as indicated in the detailed description below.</p> +<p>Suppose Alice has a message (msg) to send to Bob.</p> +<ul> +<li>Alice: +<ol> +<li>Picks the most recent of her own D-H encryption keys that Bob has +acknowledged receiving (by using it in a Data Message, or failing that, +in the AKE). Let key<sub>A</sub> be that key, and let keyid<sub>A</sub> +be its serial number.</li> +<li>If the above key is Alice's most recent key, she generates a new D-H key +(next_dh), to get the serial number keyid<sub>A</sub>+1.</li> +<li>Picks the most recent of Bob's D-H encryption keys that she has +received from him (either in a Data Message or in the AKE). Let +key<sub>B</sub> by that key, and let keyid<sub>B</sub> be its serial +number.</li> +<li>Uses Diffie-Hellman to compute a shared secret from the two keys +key<sub>A</sub> and key<sub>B</sub>, and generates the +sending AES key, ek, and the sending MAC key, mk, as detailed +below.</li> +<li>Collects any old MAC keys that were used in previous messages, but +will never again be used (because their associated D-H keys are no +longer the most recent ones) into a list, oldmackeys.</li> +<li>Picks a value of the counter, ctr, so that the triple +(key<sub>A</sub>, key<sub>B</sub>, ctr) is never the same for more +than one Data Message Alice sends to Bob.</li> +<li>Computes T<sub>A</sub> = (keyid<sub>A</sub>, keyid<sub>B</sub>, next_dh, +ctr, AES-CTR<sub>ek,ctr</sub>(msg))</li> +<li>Sends Bob T<sub>A</sub>, MAC<sub>mk</sub>(T<sub>A</sub>), +oldmackeys</li> +</ol></li> +<li>Bob: +<ol> +<li>Uses Diffie-Hellman to compute a shared secret from the two keys +labelled by keyid<sub>A</sub> and keyid<sub>B</sub>, and generates the +receiving AES key, ek, and the receiving MAC key, mk, as detailed +below. (These will be the same as the keys Alice generated, above.)</li> +<li>Uses mk to verify MAC<sub>mk</sub>(T<sub>A</sub>).</li> +<li>Uses ek and ctr to decrypt +AES-CTR<sub>ek,ctr</sub>(msg).</li> +</ol> +</li> +</ul> +<h3>Socialist Millionaires' Protocol (SMP)</h3> +<p>While data messages are being exchanged, either Alice or Bob may +run SMP to detect impersonation or man-in-the-middle attacks. +As above, all exponentiations are done modulo a particular 1536-bit +prime, and g<sub>1</sub> is a generator of that group. All sent values +include zero-knowledge proofs that they were generated according to +this protocol, as indicated in the detailed description below.</p> +<p>Suppose Alice and Bob have secret information x and y respectively, +and they wish to know whether x = y. The Socialist Millionaires' Protocol +allows them to compare x and y without revealing any other information +than the value of (x == y). For OTR, the secrets contain +information about both parties' long-term authentication public keys, +as well as information entered by the users themselves. If x = y, +this means that Alice and Bob entered the same secret information, and +so must be the same entities who established that secret to begin with.</p> +<p>Assuming that Alice begins the exchange:</p> +<ul> +<li>Alice: +<ol> +<li>Picks random exponents a<sub>2</sub> and a<sub>3</sub></li> +<li>Sends Bob g<sub>2a</sub> = g<sub>1</sub><sup>a<sub>2</sub></sup> and +g<sub>3a</sub> = g<sub>1</sub><sup>a<sub>3</sub></sup></li> +</ol></li> +<li>Bob: +<ol> +<li>Picks random exponents b<sub>2</sub> and b<sub>3</sub></li> +<li>Computes g<sub>2b</sub> = g<sub>1</sub><sup>b<sub>2</sub></sup> and +g<sub>3b</sub> = g<sub>1</sub><sup>b<sub>3</sub></sup></li> +<li>Computes g<sub>2</sub> = g<sub>2a</sub><sup>b<sub>2</sub></sup> and +g<sub>3</sub> = g<sub>3a</sub><sup>b<sub>3</sub></sup></li> +<li>Picks random exponent r</li> +<li>Computes P<sub>b</sub> = g<sub>3</sub><sup>r</sup> and +Q<sub>b</sub> = g<sub>1</sub><sup>r</sup> g<sub>2</sub><sup>y</sup></li> +<li>Sends Alice g<sub>2b</sub>, g<sub>3b</sub>, P<sub>b</sub> and +Q<sub>b</sub></li> +</ol></li> +<li>Alice: +<ol> +<li>Computes g<sub>2</sub> = g<sub>2b</sub><sup>a<sub>2</sub></sup> and +g<sub>3</sub> = g<sub>3b</sub><sup>a<sub>3</sub></sup></li> +<li>Picks random exponent s</li> +<li>Computes P<sub>a</sub> = g<sub>3</sub><sup>s</sup> and +Q<sub>a</sub> = g<sub>1</sub><sup>s</sup> g<sub>2</sub><sup>x</sup></li> +<li>Computes R<sub>a</sub> = (Q<sub>a</sub> / Q<sub>b</sub>) +<sup>a<sub>3</sub></sup></li> +<li>Sends Bob P<sub>a</sub>, Q<sub>a</sub> and R<sub>a</sub></li> +</ol></li> +<li>Bob: +<ol> +<li>Computes R<sub>b</sub> = (Q<sub>a</sub> / Q<sub>b</sub>) +<sup>b<sub>3</sub></sup></li> +<li>Computes R<sub>ab</sub> = R<sub>a</sub><sup>b<sub>3</sub></sup></li> +<li>Checks whether R<sub>ab</sub> == (P<sub>a</sub> / P<sub>b</sub>)</li> +<li>Sends Alice R<sub>b</sub></li> +</ol></li> +<li>Alice: +<ol> +<li>Computes R<sub>ab</sub> = R<sub>b</sub><sup>a<sub>3</sub></sup></li> +<li>Checks whether R<sub>ab</sub> == (P<sub>a</sub> / P<sub>b</sub>)</li> +</ol></li> +<li>If everything is done correctly, then R<sub>ab</sub> should hold the +value of (P<sub>a</sub> / P<sub>b</sub>) times +(g<sub>2</sub><sup>a<sub>3</sub>b<sub>3</sub></sup>)<sup>(x - y)</sup>, which means that the test at the end of +the protocol will only succeed if x == y. Further, since +g<sub>2</sub><sup>a<sub>3</sub>b<sub>3</sub></sup> is a random number +not known to any party, if x is not equal to y, no other information is +revealed.</li> +</ul> +<h2>Details of the protocol</h2> +<h3>Unencoded messages</h3> +<p>This section describes the messages in the OTR protocol that are not +base-64 encoded binary.</p> +<h4>OTR Query Messages</h4> +<p>If Alice wishes to communicate to Bob that she would like to use OTR, +she sends a message containing the string "?OTR" followed by an +indication of what versions of OTR she is willing to use with Bob. The +version string is constructed as follows:</p> +<ul> +<li>If she is willing to use OTR version 1, the version string must +start with "?".</li> +<li>If she is willing to use OTR versions other than 1, a "v" followed +by the byte identifiers for the versions in question, followed by "?". +The byte identifier for OTR version 2 is "2", and similarly for 3. The +order of the identifiers between the "v" and the "?" does not matter, +but none should be listed more than once.</li> +</ul> +<p>For example:</p> +<dl> +<dt>"?OTR?"</dt> +<dd>Version 1 only</dd> +<dt>"?OTRv2?"</dt> +<dd>Version 2 only</dd> +<dt>"?OTRv23?"</dt> +<dd>Versions 2 and 3</dd> +<dt>"?OTR?v2?"</dt> +<dd>Versions 1 and 2</dd> +<dt>"?OTRv24x?"</dt> +<dd>Version 2, and hypothetical future versions identified by "4" and +"x"</dd> +<dt>"?OTR?v24x?"</dt> +<dd>Versions 1, 2, and hypothetical future versions identified by "4" and +"x"</dd> +<dt>"?OTR?v?"</dt> +<dd>Also version 1 only</dd> +<dt>"?OTRv?"</dt> +<dd>A bizarre claim that Alice would like to start an OTR conversation, +but is unwilling to speak any version of the protocol</dd> +</dl> +<p>These strings may be hidden from the user (for example, in +an attribute of an HTML tag), and/or may be accompanied by an +explanitory message ("Alice has requested an Off-the-Record private +conversation."). If Bob is willing to use OTR with Alice (with a +protocol version that Alice has offered), he should start the AKE.</p> +<h4>Tagged plaintext messages</h4> +<p>If Alice wishes to communicate to Bob that she is willing to use OTR, +she can attach a special whitespace tag to any plaintext message she +sends him. This tag may occur anywhere in the message, and may be +hidden from the user (as in the Query Messages, above).</p> +<p>The tag consists of the following 16 bytes, followed by one or more +sets of 8 bytes indicating the version of OTR Alice is willing to +use:</p> +<ul> +<li>Always send "\x20\x09\x20\x20\x09\x09\x09\x09" +"\x20\x09\x20\x09\x20\x09\x20\x20", followed by one or more of:</li> +<li>"\x20\x09\x20\x09\x20\x20\x09\x20" to indicate a willingness to use +OTR version 1 with Bob (note: this string must come before all other +whitespace version tags, if it is present, for backwards +compatibility)</li> +<li>"\x20\x20\x09\x09\x20\x20\x09\x20" to indicate a willingness to use +OTR version 2 with Bob</li> +<li>"\x20\x20\x09\x09\x20\x20\x09\x09" to indicate a willingness to use +OTR version 3 with Bob</li> +</ul> +<p>If Bob is willing to use OTR with Alice (with a protocol version that +Alice has offered), he should start the AKE. On the other hand, if +Alice receives a plaintext message from Bob (rather than an initiation +of the AKE), she should stop sending him the whitespace tag.</p> +<h4>OTR Error Messages</h4> +<p>Any message containing the string "?OTR Error:" is an OTR Error +Message. The following part of the message should contain +human-readable details of the error.</p> +<h3>Encoded messages</h3> +<p>This section describes the byte-level format of the base-64 encoded +binary OTR messages. The binary form of each of the messages is +described below. To transmit one of these messages, construct the ASCII +string consisting of the five bytes "?OTR:", followed by the base-64 +encoding of the binary form of the message, followed by the byte +".".</p> +<p>For the Diffie-Hellman group computations, the group is the one +defined in RFC 3526 with 1536-bit modulus (hex, big-endian):</p> +<blockquote><pre> +FFFFFFFF FFFFFFFF C90FDAA2 2168C234 C4C6628B 80DC1CD1 +29024E08 8A67CC74 020BBEA6 3B139B22 514A0879 8E3404DD +EF9519B3 CD3A431B 302B0A6D F25F1437 4FE1356D 6D51C245 +E485B576 625E7EC6 F44C42E9 A637ED6B 0BFF5CB6 F406B7ED +EE386BFB 5A899FA5 AE9F2411 7C4B1FE6 49286651 ECE45B3D +C2007CB8 A163BF05 98DA4836 1C55D39A 69163FA8 FD24CF5F +83655D23 DCA3AD96 1C62F356 208552BB 9ED52907 7096966D +670C354E 4ABC9804 F1746C08 CA237327 FFFFFFFF FFFFFFFF +</pre></blockquote> +<p>and a generator (g) of 2. Note that this means that whenever you see a +Diffie-Hellman exponentiation in this document, it always means that the +exponentiation is done modulo the above 1536-bit number.</p> +<h4>Data types</h4> +<dl> +<dt>Bytes (BYTE):</dt> +<dd> 1 byte unsigned value</dd> +<dt>Shorts (SHORT):</dt> +<dd> 2 byte unsigned value, big-endian</dd> +<dt>Ints (INT):</dt> +<dd> 4 byte unsigned value, big-endian</dd> +<dt>Multi-precision integers (MPI):</dt> +<dd> 4 byte unsigned len, big-endian +<br /> len byte unsigned value, big-endian +<br /> (MPIs must use the minimum-length encoding; i.e. no leading 0x00 + bytes. This is important when calculating public key + fingerprints.)</dd> +<dt>Opaque variable-length data (DATA):</dt> +<dd> 4 byte unsigned len, big-endian +<br /> len byte data</dd> +<dt>Initial CTR-mode counter value (CTR):</dt> +<dd> 8 bytes data</dd> +<dt>Message Authentication Code (MAC):</dt> +<dd> 20 bytes MAC data</dd> +</dl> +<h4>Public keys, signatures, and fingerprints</h4> +<p>OTR users have long-lived public keys that they use for +authentication (but <em>not</em> encryption). The current version of +the OTR protocol only supports DSA public keys, but there is a key type +marker for future extensibility.</p> +<dl> +<dt>OTR public authentication DSA key (PUBKEY):</dt> +<dd>Pubkey type (SHORT) +<ul class="note"><li>DSA public keys have type 0x0000</li></ul> +p (MPI) +<br />q (MPI) +<br />g (MPI) +<br />y (MPI) +<ul class="note"><li>(p,q,g,y) are the DSA public key parameters</li></ul> +</dd> +</dl> +<p>OTR public keys are used to generate <b>signatures</b>; different +types of keys produce signatures in different formats. The format for a +signature made by a DSA public key is as follows:</p> +<dl> +<dt>DSA signature (SIG):</dt> +<dd> (len is the length of the DSA public parameter q, which in +current implementations must be 20 bytes, or 160 bits) +<br /> len byte unsigned r, big-endian +<br /> len byte unsigned s, big-endian</dd> +</dl> +<p>OTR public keys have <b>fingerprints</b>, which are hex strings that +serve as identifiers for the public key. The fingerprint is calculated +by taking the SHA-1 hash of the byte-level representation of the public +key. However, there is an exception for backwards compatibility: if the +pubkey type is 0x0000, those two leading 0x00 bytes are omitted from the +data to be hashed. The encoding assures that, assuming the hash +function itself has no useful collisions, and DSA keys have length less +than 524281 bits (500 times larger than most DSA keys), no two public +keys will have the same fingerprint.</p> +<h4>Instance Tags</h4> +<p>Clients include instance tags in all OTR version 3 messages. Instance +tags are 32-bit values that are intended to be persistent. If the same +client is logged into the same account from multiple locations, the +intention is that the client will have different instance tags at each +location. As shown below, OTR version 3 messages (fragmented and +unfragmented) include the source and destination instance tags. If a client +receives a message that lists a destination instance tag different from its +own, the client should discard the message.</p> +<p>The smallest valid instance tag is 0x00000100. It is appropriate to set the +destination instance tag to '0' when an actual destination instance tag is +not known at the time the message is prepared. If a client receives a +message with the sender instance tag set to less than 0x00000100, it should +discard the message. Similarly, if a client receives a message with the +recipient instance tag set to greater than 0 but less than 0x00000100, it +should discard the message. +</p> + +<p>This avoids an issue on IM networks that always relay all messages to +all sessions of a client who is logged in multiple times. In this +situation, OTR clients can attempt to establish an OTR session indefinitely +if there are interleaving messages from each of the sessions.</p> +<h4>D-H Commit Message</h4> +<p>This is the first message of the AKE. Bob sends it to Alice to +commit to a choice of D-H encryption key (but the key itself is not yet +revealed). This allows the secure session id to be much shorter than in +OTR version 1, while still preventing a man-in-the-middle attack on +it.</p> +<dl> +<dt>Protocol version (SHORT)</dt> +<dd>The version number of this protocol is 0x0003.</dd> +<dt>Message type (BYTE)</dt> +<dd>The D-H Commit Message has type 0x02.</dd> +<dt>Sender Instance tag (INT)</dt> +<dd>The instance tag of the person sending this message.</dd> +<dt>Receiver Instance tag (INT)</dt> +<dd>The instance tag of the intended recipient. +For a commit message this will often be 0, since the other party +may not have identified their instance tag yet.</dd> +<dt>Encrypted g<sup>x</sup> (DATA)</dt> +<dd>Produce this field as follows: +<ul> +<li>Choose a random value r (128 bits)</li> +<li>Choose a random value x (at least 320 bits)</li> +<li>Serialize g<sup>x</sup> as an MPI, gxmpi. [gxmpi will probably be +196 bytes long, starting with "\x00\x00\x00\xc0".]</li> +<li>Encrypt gxmpi using AES128-CTR, with key r and initial counter value +0. The result will be the same length as gxmpi.</li> +<li>Encode this encrypted value as the DATA field.</li> +</ul></dd> +<dt>Hashed g<sup>x</sup> (DATA)</dt> +<dd>This is the SHA256 hash of gxmpi.</dd> +</dl> +<h4>D-H Key Message</h4> +<p>This is the second message of the AKE. Alice sends it to Bob, and it +simply consists of Alice's D-H encryption key.</p> +<dl> +<dt>Protocol version (SHORT)</dt> +<dd>The version number of this protocol is 0x0003.</dd> +<dt>Message type (BYTE)</dt> +<dd>The D-H Key Message has type 0x0a.</dd> +<dt>Sender Instance tag (INT)</dt> +<dd>The instance tag of the person sending this message.</dd> +<dt>Receiver Instance tag (INT)</dt> +<dd>The instance tag of the intended recipient.</dd> +<dt>g<sup>y</sup> (MPI)</dt> +<dd>Choose a random value y (at least 320 bits), and calculate +g<sup>y</sup>.</dd> +</dl> +<h4>Reveal Signature Message</h4> +<p>This is the third message of the AKE. Bob sends it to Alice, +revealing his D-H encryption key (and thus opening an encrypted +channel), and also authenticating himself (and the parameters of the +channel, preventing a man-in-the-middle attack on the channel itself) to +Alice.</p> +<dl> +<dt>Protocol version (SHORT)</dt> +<dd>The version number of this protocol is 0x0003.</dd> +<dt>Message type (BYTE)</dt> +<dd>The Reveal Signature Message has type 0x11.</dd> +<dt>Sender Instance tag (INT)</dt> +<dd>The instance tag of the person sending this message.</dd> +<dt>Receiver Instance tag (INT)</dt> +<dd>The instance tag of the intended recipient.</dd> +<dt>Revealed key (DATA)</dt> +<dd>This is the value r picked earlier.</dd> +<dt>Encrypted signature (DATA)</dt> +<dd>This field is calculated as follows: +<ul> +<li>Compute the Diffie-Hellman shared secret s.</li> +<li>Use s to compute an AES key c and two MAC keys m1 and m2, as specified below.</li> +<li>Select keyid<sub>B</sub>, a serial number for the D-H key computed +earlier. It is an INT, and must be greater than 0.</li> +<li>Compute the 32-byte value M<sub>B</sub> to be the SHA256-HMAC of the +following data, using the key m1:<dl> +<dt>g<sup>x</sup> (MPI)</dt> +<dt>g<sup>y</sup> (MPI)</dt> +<dt>pub<sub>B</sub> (PUBKEY)</dt> +<dt>keyid<sub>B</sub> (INT)</dt> +</dl></li> +<li>Let X<sub>B</sub> be the following structure:<dl> +<dt>pub<sub>B</sub> (PUBKEY)</dt> +<dt>keyid<sub>B</sub> (INT)</dt> +<dt>sig<sub>B</sub>(M<sub>B</sub>) (SIG)</dt> +<dd>This is the signature, using the private part of the key +pub<sub>B</sub>, of the 32-byte M<sub>B</sub> (taken modulo q instead of +being truncated (as described in FIPS-186), and not hashed again).</dd> +</dl></li> +<li>Encrypt X<sub>B</sub> using AES128-CTR with key c and initial +counter value 0.</li> +<li>Encode this encrypted value as the DATA field.</li> +</ul></dd> +<dt>MAC'd signature (MAC)</dt> +<dd>This is the SHA256-HMAC-160 (that is, the first 160 bits of the +SHA256-HMAC) of the encrypted signature field (including the four-byte +length), using the key m2.</dd> +</dl> +<h4>Signature Message</h4> +<p>This is the final message of the AKE. Alice sends it to Bob, +authenticating herself and the channel parameters to him.</p> +<dl> +<dt>Protocol version (SHORT)</dt> +<dd>The version number of this protocol is 0x0003.</dd> +<dt>Message type (BYTE)</dt> +<dd>The Signature Message has type 0x12.</dd> +<dt>Sender Instance tag (INT)</dt> +<dd>The instance tag of the person sending this message.</dd> +<dt>Receiver Instance tag (INT)</dt> +<dd>The instance tag of the intended recipient.</dd> +<dt>Encrypted signature (DATA)</dt> +<dd>This field is calculated as follows: +<ul> +<li>Compute the Diffie-Hellman shared secret s.</li> +<li>Use s to compute an AES key c' and two MAC keys m1' and m2', as specified below.</li> +<li>Select keyid<sub>A</sub>, a serial number for the D-H key computed +earlier. It is an INT, and must be greater than 0.</li> +<li>Compute the 32-byte value M<sub>A</sub> to be the SHA256-HMAC of the +following data, using the key m1':<dl> +<dt>g<sup>y</sup> (MPI)</dt> +<dt>g<sup>x</sup> (MPI)</dt> +<dt>pub<sub>A</sub> (PUBKEY)</dt> +<dt>keyid<sub>A</sub> (INT)</dt> +</dl></li> +<li>Let X<sub>A</sub> be the following structure:<dl> +<dt>pub<sub>A</sub> (PUBKEY)</dt> +<dt>keyid<sub>A</sub> (INT)</dt> +<dt>sig<sub>A</sub>(M<sub>A</sub>) (SIG)</dt> +<dd>This is the signature, using the private part of the key +pub<sub>A</sub>, of the 32-byte M<sub>A</sub> (which does not need to be +hashed again to produce the signature).</dd> +</dl></li> +<li>Encrypt X<sub>A</sub> using AES128-CTR with key c' and initial +counter value 0.</li> +<li>Encode this encrypted value as the DATA field.</li> +</ul></dd> +<dt>MAC'd signature (MAC)</dt> +<dd>This is the SHA256-HMAC-160 (that is, the first 160 bits of the +SHA256-HMAC) of the encrypted signature field (including the four-byte +length), using the key m2'.</dd> +</dl> +<h4>Data Message</h4> +<p>This message is used to transmit a private message to the +correspondent. It is also used to reveal old MAC keys.</p> +<p>The plaintext message (either before encryption, or after decryption) +consists of a human-readable message (encoded in UTF-8, optionally with +HTML markup), optionally followed by:</p> +<ul> +<li>a single NUL (a BYTE with value 0x00), <b>and</b></li> +<li>zero or more TLV (type/length/value) records (with no padding +between them)</li> +</ul> +<p>Each TLV record is of the form:</p> +<dl> +<dt>Type (SHORT)</dt> +<dd>The type of this record. Records with unrecognized types should be +ignored.</dd> +<dt>Length (SHORT)</dt> +<dd>The length of the following field</dd> +<dt>Value (len BYTEs) [where len is the value of the Length field]</dt> +<dd>Any pertinent data for the record type.</dd> +</dl> +<p>Some TLV examples:</p> +<dl> +<dt>\x00\x01\x00\x00</dt> +<dd>A TLV of type 1, containing no data</dd> +<dt>\x00\x00\x00\x05\x68\x65\x6c\x6c\x6f</dt> +<dd>A TLV of type 0, containing the value "hello"</dd> +</dl> +<p>The currently defined TLV record types are:</p> +<dl> +<dt>Type 0: Padding</dt> +<dd>The value may be an arbitrary amount of data, which should be +ignored. This type can be used to disguise the length of the plaintext +message.</dd> +<dt>Type 1: Disconnected</dt> +<dd>If the user requests to close the private connection, you may send a +message (possibly with empty human-readable part) containing a record +with this TLV type just before you discard the session keys, and +transition to MSGSTATE_PLAINTEXT (see below). If you receive a TLV +record of this type, you should transition to MSGSTATE_FINISHED (see +below), and inform the user that his correspondent has closed his end of +the private connection, and the user should do the same.</dd> +<dt>Type 2: SMP Message 1</dt> +<dd>The value represents an initiating message of the Socialist +Millionaires' Protocol, described below.</dd> +<dt>Type 3: SMP Message 2</dt> +<dd>The value represents the second message in an instance of SMP.</dd> +<dt>Type 4: SMP Message 3</dt> +<dd>The value represents the third message in an instance of SMP.</dd> +<dt>Type 5: SMP Message 4</dt> +<dd>The value represents the final message in an instance of SMP.</dd> +<dt>Type 6: SMP Abort Message</dt> +<dd>If the user cancels SMP prematurely or encounters an error in the +protocol and cannot continue, you may send a message (possibly with empty +human-readable part) with this TLV type to instruct the other party's +client to abort the protocol. The associated length should be zero and +the associated value should be empty. If you receive a TLV of this type, +you should change the SMP state to SMP_EXPECT1 (see below).</dd> +<dt>Type 7: SMP Message 1Q</dt> +<dd>Like a SMP Message 1, but whose value begins with a NUL-terminated +user-specified question.</dd> +<dt>Type 8: Extra symmetric key</dt> +<dd>If you wish to use the extra symmetric key, compute it yourself as +outlined in the section "Extra symmetric key", below. Then send this +type 8 TLV to your buddy to indicate that you'd like to use the extra +symmetric key for something. The value of the TLV begins with a 4-byte +indication of what this symmetric key will be used for (file transfer, +voice encryption, etc.). After that, the contents are use-specific +(which file, etc.). There are no currently defined uses. Note that the +value of the key itself is <em>not</em> placed into the TLV; your buddy +will compute it on his/her own. +</dd> +</dl> +<p>SMP Message TLVs (types 2-5) all carry data sharing the same general +format:</p> +<dl> +<dt>MPI count (INT)</dt> +<dd>The number of MPIs contained in the remainder of the TLV.</dd> +<dt>MPI 1 (MPI)</dt> +<dd>The first MPI of the TLV, serialized into a byte array.</dd> +<dt>MPI 2 (MPI)</dt> +<dd>The second MPI of the TLV, serialized into a byte array.</dd> +<dt>etc.</dt> +</dl> +<p>There should be as many MPIs as declared in the MPI count field. For +the exact MPIs passed for each SMP TLV, see the SMP state machine +below.</p> +<p>A message with an empty human-readable part (the plaintext is of zero +length, or starts with a NUL) is a "heartbeat" packet, and should not +be displayed to the user. (But it's still useful to effect key +rotations.)</p> +<p>Data Message format:</p> +<dl> +<dt>Protocol version (SHORT)</dt> +<dd>The version number of this protocol is 0x0003.</dd> +<dt>Message type (BYTE)</dt> +<dd>The Data Message has type 0x03.</dd> +<dt>Sender Instance tag (INT)</dt> +<dd>The instance tag of the person sending this message.</dd> +<dt>Receiver Instance tag (INT)</dt> +<dd>The instance tag of the intended recipient.</dd> +<dt>Flags (BYTE)</dt> +<dd>The bitwise-OR of the flags for this message. Usually you should +set this to 0x00. The only currently defined flag is:<dl> +<dt>IGNORE_UNREADABLE (0x01)</dt> +<dd>If you receive a Data Message with this flag set, and you are unable +to decrypt the message or verify the MAC (because, for example, you +don't have the right keys), just ignore the message instead of producing +some kind of error or notification to the user.</dd> +</dl></dd> +<dt>Sender keyid (INT)</dt> +<dd>Must be strictly greater than 0, and increment by 1 with each key +change</dd> +<dt>Recipient keyid (INT)</dt> +<dd>Must therefore be strictly greater than 0, as the receiver has no +key with id 0. +<br />The sender and recipient keyids are those used to encrypt and MAC +this message.</dd> +<dt>DH y (MPI)</dt> +<dd>The *next* [i.e. sender_keyid+1] public key for the sender</dd> +<dt>Top half of counter init (CTR)</dt> +<dd>This should monotonically increase (as a big-endian value) for + each message sent with the same (sender keyid, recipient keyid) + pair, and must not be all 0x00.</dd> +<dt>Encrypted message (DATA)</dt> +<dd>Using the appropriate encryption key (see below) derived from the + sender's and recipient's DH public keys (with the keyids given in + this message), perform AES128 counter-mode (CTR) encryption of the + message. The initial counter is a 16-byte value whose first 8 + bytes are the above "top half of counter init" value, and whose + last 8 bytes are all 0x00. Note that counter mode does not change + the length of the message, so no message padding needs to be done. + If you *want* to do message padding (to disguise the length of + your message), use the above TLV of type 0.</dd> +<dt>Authenticator (MAC)</dt> +<dd>The SHA1-HMAC, using the appropriate MAC key (see below) of everything + from the Protocol version to the end of the encrypted message</dd> +<dt>Old MAC keys to be revealed (DATA)</dt> +<dd>See "Revealing MAC Keys", below.</dd> +</dl> +<h3>Socialist Millionaires' Protocol (SMP)</h3> +<p>The Socialist Millionaires' Protocol allows two parties with secret +information x and y respectively to check whether (x==y) without revealing +any additional information about the secrets. The protocol used by OTR is +based on the work of Boudot, Schoenmakers and Traore (2001). A full +justification for its use in OTR is made by Alexander and Goldberg, +in a paper published in 2007. The following is a technical account +of what is transmitted during the course of the protocol.</p> +<h4>Secret information</h4> +<p>The secret information x and y compared during this protocol contains +not only information entered by the users, but also information unique to +the conversation in which SMP takes place. Specifically, the format is:</p> +<dl> +<dt>Version (BYTE)</dt> +<dd>The version of SMP used. The version described here is 1.</dd> +<dt>Initiator fingerprint (20 BYTEs)</dt> +<dd>The fingerprint that the party initiating SMP is using in +the current conversation.</dd> +<dt>Responder fingerprint (20 BYTEs)</dt> +<dd>The fingerprint that the party that did not initiate SMP is +using in the current conversation.</dd> +<dt>Secure Session ID</dt> +<dd>The ssid described below.</dd> +<dt>User-specified secret</dt> +<dd>The input string given by the user at runtime.</dd> +</dl> +<p>Then the SHA256 hash of the above is taken, and the digest becomes the +actual secret (x or y) to be used in SMP. The additional fields insure +that not only do both parties know the same secret input string, but no +man-in-the-middle is capable of reading their communication either.</p> +<h3>The SMP state machine</h3> +<p>Whenever the OTR message state machine has MSGSTATE_ENCRYPTED set +(see below), the SMP state machine may progress. If at any point +MSGSTATE_ENCRYPTED becomes unset, SMP must abandon its state and return +to its initial setup. The SMP state consists of one main variable, as +well as information from the partial computations at each protocol step.</p> +<h4>Expected Message</h4> +<p>This main state variable for SMP controls what SMP-specific TLVs will +be accepted. This variable has no effect on type 0 or type 1 TLVs, which +are always allowed. smpstate can take one of four values:</p> +<dl> +<dt>SMPSTATE_EXPECT1</dt> +<dd>This state indicates that only type 2 (SMP message 1) and type 7 +(SMP message 1Q) TLVs should be accepted. This is the default state when +SMP has not yet begun. This state is also reached whenever an error +occurs or SMP is aborted, and the protocol must be restarted from the +beginning.</dd> +<dt>SMPSTATE_EXPECT2</dt> +<dd>This state indicates that only type 3 TLVs (SMP message 2) should +be accepted.</dd> +<dt>SMPSTATE_EXPECT3</dt> +<dd>This state indicates that only type 4 TLVs (SMP message 3) should +be accepted.</dd> +<dt>SMPSTATE_EXPECT4</dt> +<dd>This state indicates that only type 5 TLVs (SMP message 4) should +be accepted.</dd> +</dl> +<h4>State Transitions</h4> +<p>There are 7 actions that an OTR client must handle:</p> +<ul> +<li>Received TLVs: +<ul> +<li>SMP Message 1</li> +<li>SMP Message 2</li> +<li>SMP Message 3</li> +<li>SMP Message 4</li> +<li>SMP Abort Message</li> +</ul></li> +<li>User actions:</li> +<ul> +<li>User requests to begin SMP</li> +<li>User requests to abort SMP</li> +</ul></li> +</ul> +<p>The following sections outline what is to be done in each case. They +all assume that MSGSTATE_ENCRYPTED is set. For simplicity, they also +assume that Alice has begun SMP, and Bob is responding to her.</p> +<h4>SMP Hash function</h4> +<p>In the following actions, there are many places where a SHA256 hash of +an integer followed by one or two MPIs is taken. The input to this hash +function is:</p> +<dl> +<dt>Version (BYTE)</dt> +<dd>This distinguishes calls to the hash function at different points in +the protocol, to prevent Alice from replaying Bob's zero knowledge proofs +or vice versa.</dd> +<dt>First MPI (MPI)</dt> +<dd>The first MPI given as input, serialized in the usual way.</dd> +<dt>Second MPI (MPI)</dt> +<dd>The second MPI given as input, if present, serialized in the usual way. +If only one MPI is given as input, this field is simply omitted.</dd> +</dl> +<h4>Receiving a type 2 TLV (SMP message 1)</h4> +<p>SMP message 1 is sent by Alice to begin a DH exchange to determine two +new generators, g<sub>2</sub> and g<sub>3</sub>. It contains the +following mpi values:</p> +<dl> +<dt>g<sub>2a</sub></dt> +<dd>Alice's half of the DH exchange to determine g<sub>2</sub>.</dd> +<dt>c2, D2</dt> +<dd>A zero-knowledge proof that Alice knows the exponent associated with +her transmitted value g<sub>2a</sub>.</dd> +<dt>g<sub>3a</sub></dt> +<dd>Alice's half of the DH exchange to determine g<sub>3</sub>.</dd> +<dt>c3, D3</dt> +<dd>A zero-knowledge proof that Alice knows the exponent associated with +her transmitted value g<sub>3a</sub>.</dd> +</dl> +<p>A type 7 (SMP Message 1Q) TLV is the same as the above, but is +preceded by a user-specified question, which is associated with the +user-specified portion of the secret.</p> +<p>When Bob receives this TLV he should do:</p> +<dl> +<dt>If smpstate is not SMPSTATE_EXPECT1:</dt> +<dd>Set smpstate to SMPSTATE_EXPECT1 and send a type 6 TLV (SMP abort) +to Alice.</dd> +<dt>If smpstate is SMPSTATE_EXPECT1:</dt> +<dd>Verify Alice's zero-knowledge proofs for g<sub>2a</sub> and +g<sub>3a</sub>: +<ol> +<li>Check that both g<sub>2a</sub> and g<sub>3a</sub> are >= 2 and +<= modulus-2.</li> +<li>Check that c2 = SHA256(1, g<sub>1</sub><sup>D2</sup> +g<sub>2a</sub><sup>c2</sup>).</li> +<li>Check that c3 = SHA256(2, g<sub>1</sub><sup>D3</sup> +g<sub>3a</sub><sup>c3</sup>).</li> +</ol> +Create a type 3 TLV (SMP message 2) and send it to Alice: +<ol> +<li>Determine Bob's secret input y, which is to be compared to Alice's +secret x.</li> +<li>Pick random exponents b<sub>2</sub> and b<sub>3</sub>. +These will used during the DH exchange to pick generators.</li> +<li>Pick random exponents r2, r3, r4, r5 and r6. +These will be used to add a blinding factor to the final results, and +to generate zero-knowledge proofs that this message was created honestly.</li> +<li>Compute g<sub>2b</sub> = g<sub>1</sub><sup>b<sub>2</sub></sup> and +g<sub>3b</sub> = g<sub>1</sub><sup>b<sub>3</sub></sup></li> +<li>Generate a zero-knowledge proof that the exponent b<sub>2</sub> is +known by setting c2 = SHA256(3, g<sub>1</sub><sup>r2</sup>) and +D2 = r2 - b<sub>2</sub> c2 mod q. In the zero-knowledge proofs the D values +are calculated modulo q = (p - 1) / 2, where p is the same 1536-bit prime +as elsewhere. The random exponents are 1536-bit numbers.</li> +<li>Generate a zero-knowledge proof that the exponent b<sub>3</sub> is +known by setting c3 = SHA256(4, g<sub>1</sub><sup>r3</sup>) and +D3 = r3 - b<sub>3</sub> c3 mod q.</li> +<li>Compute g<sub>2</sub> = g<sub>2a</sub><sup>b<sub>2</sub></sup> and +g<sub>3</sub> = g<sub>3a</sub><sup>b<sub>3</sub></sup></li> +<li>Compute P<sub>b</sub> = g<sub>3</sub><sup>r4</sup> and +Q<sub>b</sub> = g<sub>1</sub><sup>r4</sup> g<sub>2</sub><sup>y</sup></li> +<li>Generate a zero-knowledge proof that P<sub>b</sub> and Q<sub>b</sub> +were created according to the protocol by setting +cP = SHA256(5, g<sub>3</sub><sup>r5</sup>, g<sub>1</sub><sup>r5</sup> +g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP mod q and D6 = r6 - y cP mod q.</li> +<li>Store the values of g<sub>3a</sub>, g<sub>2</sub>, g<sub>3</sub>, +b<sub>3</sub>, P<sub>b</sub> and Q<sub>b</sub> for use later in the +protocol.</li> +<li>Send Alice a type 3 TLV (SMP message 2) containing g<sub>2b</sub>, +c2, D2, g<sub>3b</sub>, c3, D3, P<sub>b</sub>, Q<sub>b</sub>, cP, D5 +and D6, in that order.</li> +</ol> +Set smpstate to SMPSTATE_EXPECT3.</dd> +</dl> +<h4>Receiving a type 3 TLV (SMP message 2)</h4> +<p>SMP message 2 is sent by Bob to complete the DH exchange to +determine the new generators, g<sub>2</sub> and g<sub>3</sub>. +It also begins the construction of the values used in the final +comparison of the protocol. It contains the following mpi values:</p> +<dl> +<dt>g<sub>2b</sub></dt> +<dd>Bob's half of the DH exchange to determine g<sub>2</sub>.</dd> +<dt>c2, D2</dt> +<dd>A zero-knowledge proof that Bob knows the exponent associated with +his transmitted value g<sub>2b</sub>.</dd> +<dt>g<sub>3b</sub></dt> +<dd>Bob's half of the DH exchange to determine g<sub>3</sub>.</dd> +<dt>c3, D3</dt> +<dd>A zero-knowledge proof that Bob knows the exponent associated with +his transmitted value g<sub>3b</sub>.</dd> +<dt>P<sub>b</sub>, Q<sub>b</sub></dt> +<dd>These values are used in the final comparison to determine if Alice +and Bob share the same secret.</dd> +<dt>cP, D5, D6</dt> +<dd>A zero-knowledge proof that P<sub>b</sub> and Q<sub>b</sub> were +created according to the protcol given above.</dd> +</dl> +<p>When Alice receives this TLV she should do:</p> +<dl> +<dt>If smpstate is not SMPSTATE_EXPECT2:</dt> +<dd>Set smpstate to SMPSTATE_EXPECT1 and send a type 6 TLV (SMP abort) +to Bob.</dd> +<dt>If smpstate is SMPSTATE_EXPECT2:</dt> +<dd>Verify Bob's zero-knowledge proofs for g<sub>2b</sub>, +g<sub>3b</sub>, P<sub>b</sub> and Q<sub>b</sub>: +<ol> +<li>Check that g<sub>2b</sub>, +g<sub>3b</sub>, P<sub>b</sub> and Q<sub>b</sub> are >= 2 and +<= modulus-2.</li> +<li>Check that c2 = SHA256(3, g<sub>1</sub><sup>D2</sup> +g<sub>2b</sub><sup>c2</sup>).</li> +<li>Check that c3 = SHA256(4, g<sub>1</sub><sup>D3</sup> +g<sub>3b</sub><sup>c3</sup>).</li> +<li>Check that cP = SHA256(5, g<sub>3</sub><sup>D5</sup> +P<sub>b</sub><sup>cP</sup>, g<sub>1</sub><sup>D5</sup> +g<sub>2</sub><sup>D6</sup> Q<sub>b</sub><sup>cP</sup>).</li> +</ol> +Create a type 4 TLV (SMP message 3) and send it to Bob: +<ol> +<li>Pick random exponents r4, r5, r6 and r7. +These will be used to add a blinding factor to the final results, and +to generate zero-knowledge proofs that this message was created honestly.</li> +<li>Compute g<sub>2</sub> = g<sub>2b</sub><sup>a<sub>2</sub></sup> and +g<sub>3</sub> = g<sub>3b</sub><sup>a<sub>3</sub></sup></li> +<li>Compute P<sub>a</sub> = g<sub>3</sub><sup>r4</sup> and +Q<sub>a</sub> = g<sub>1</sub><sup>r4</sup> g<sub>2</sub><sup>x</sup></li> +<li>Generate a zero-knowledge proof that P<sub>a</sub> and Q<sub>a</sub> +were created according to the protocol by setting +cP = SHA256(6, g<sub>3</sub><sup>r5</sup>, g<sub>1</sub><sup>r5</sup> +g<sub>2</sub><sup>r6</sup>), D5 = r5 - r4 cP mod q and D6 = r6 - x cP mod q.</li> +<li>Compute R<sub>a</sub> = (Q<sub>a</sub> / Q<sub>b</sub>) +<sup>a<sub>3</sub></sup></li> +<li>Generate a zero-knowledge proof that R<sub>a</sub> was created +according to the protocol by setting cR = SHA256(7, g<sub>1</sub><sup>r7</sup>, +(Q<sub>a</sub> / Q<sub>b</sub>)<sup>r7</sup>) and +D7 = r7 - a<sub>3</sub> cR mod q.</li> +<li>Store the values of g<sub>3b</sub>, (P<sub>a</sub> / P<sub>b</sub>), +(Q<sub>a</sub> / Q<sub>b</sub>) and a<sub>3</sub> for use later in the +protocol.</li> +<li>Send Bob a type 4 TLV (SMP message 3) containing P<sub>a</sub>, +Q<sub>a</sub>, cP, D5, D6, R<sub>a</sub>, cR and D7 in that order.</li> +</ol> +Set smpstate to SMPSTATE_EXPECT4.</dd> +</dl> +<h4>Receiving a type 4 TLV (SMP message 3)</h4> +<p>SMP message 3 is Alice's final message in the SMP exchange. It +has the last of the information required by Bob to determine if x = y. +It contains the following mpi values:</p> +<dl> +<dt>P<sub>a</sub>, Q<sub>a</sub></dt> +<dd>These values are used in the final comparison to determine if Alice +and Bob share the same secret.</dd> +<dt>cP, D5, D6</dt> +<dd>A zero-knowledge proof that P<sub>a</sub> and Q<sub>a</sub> were +created according to the protcol given above.</dd> +<dt>R<sub>a</sub></dt> +<dd>This value is used in the final comparison to determine if Alice +and Bob share the same secret.</dd> +<dt>cR, D7</dt> +<dd>A zero-knowledge proof that R<sub>a</sub> was +created according to the protcol given above.</dd> +<dt> +</dl> +<p>When Bob receives this TLV he should do:</p> +<dl> +<dt>If smpstate is not SMPSTATE_EXPECT3:</dt> +<dd>Set smpstate to SMPSTATE_EXPECT1 and send a type 6 TLV (SMP abort) +to Bob.</dd> +<dt>If smpstate is SMPSTATE_EXPECT3:</dt> +<dd>Verify Alice's zero-knowledge proofs for P<sub>a</sub>, Q<sub>a</sub> +and R<sub>a</sub>: +<ol> +<li>Check that P<sub>a</sub>, Q<sub>a</sub> and R<sub>a</sub> are >= 2 and +<= modulus-2.</li> +<li>Check that cP = SHA256(6, g<sub>3</sub><sup>D5</sup> +P<sub>a</sub><sup>cP</sup>, g<sub>1</sub><sup>D5</sup> g<sub>2</sub><sup>D6</sup> +Q<sub>a</sub><sup>cP</sup>).</li> +<li>Check that cR = SHA256(7, g<sub>1</sub><sup>D7</sup> +g<sub>3a</sub><sup>cR</sup>, (Q<sub>a</sub> / Q<sub>b</sub>)<sup>D7</sup> +R<sub>a</sub><sup>cR</sup>).</li> +</ol> +Create a type 5 TLV (SMP message 4) and send it to Alice: +<ol> +<li>Pick a random exponent r7. +This will be used to generate Bob's final zero-knowledge proof that +this message was created honestly.</li> +<li>Compute R<sub>b</sub> = (Q<sub>a</sub> / Q<sub>b</sub>) +<sup>b<sub>3</sub></sup></li> +<li>Generate a zero-knowledge proof that R<sub>b</sub> was created +according to the protocol by setting cR = SHA256(8, g<sub>1</sub><sup>r7</sup>, +(Q<sub>a</sub> / Q<sub>b</sub>)<sup>r7</sup>) and +D7 = r7 - b<sub>3</sub> cR mod q.</li> +<li>Send Alice a type 5 TLV (SMP message 4) containing R<sub>b</sub>, +cR and D7 in that order.</li> +</ol> +Check whether the protocol was successful: +<ol> +<li>Compute R<sub>ab</sub> = R<sub>a</sub><sup>b<sub>3</sub></sup>.</li> +<li>Determine if x = y by checking the equivalent condition that +(P<sub>a</sub> / P<sub>b</sub>) = R<sub>ab</sub>.</li> +</ol> +Set smpstate to SMPSTATE_EXPECT1, as no more messages are expected from +Alice.</dd> +</dl> +<h4>Receiving a type 5 TLV (SMP message 4)</h4> +<p>SMP message 4 is Bob's final message in the SMP exchange. It +has the last of the information required by Alice to determine if x = y. +It contains the following mpi values:</p> +<dl> +<dt>R<sub>b</sub></dt> +<dd>This value is used in the final comparison to determine if Alice +and Bob share the same secret.</dd> +<dt>cR, D7</dt> +<dd>A zero-knowledge proof that R<sub>b</sub> was +created according to the protcol given above.</dd> +<dt> +</dl> +<p>When Alice receives this TLV she should do:</p> +<dl> +<dt>If smpstate is not SMPSTATE_EXPECT4:</dt> +<dd>Set smpstate to SMPSTATE_EXPECT1 and send a type 6 TLV (SMP abort) +to Bob.</dd> +<dt>If smpstate is SMPSTATE_EXPECT4:</dt> +<dd>Verify Bob's zero-knowledge proof for R<sub>b</sub>: +<ol> +<li>Check that R<sub>b</sub> is >= 2 and +<= modulus-2.</li> +<li>Check that cR = SHA256(8, g<sub>1</sub><sup>D7</sup> +g<sub>3b</sub><sup>cR</sup>, (Q<sub>a</sub> / Q<sub>b</sub>)<sup>D7</sup> +R<sub>b</sub><sup>cR</sup>).</li> +</ol> +Check whether the protocol was successful: +<ol> +<li>Compute R<sub>ab</sub> = R<sub>b</sub><sup>a<sub>3</sub></sup>.</li> +<li>Determine if x = y by checking the equivalent condition that +(P<sub>a</sub> / P<sub>b</sub>) = R<sub>ab</sub>.</li> +</ol> +Set smpstate to SMPSTATE_EXPECT1, as no more messages are expected from +Bob.</dd> +</dl> +<h4>User requests to begin SMP</h4> +<dl> +<dt>If smpstate is not set to SMPSTATE_EXPECT1:</dt> +<dd>SMP is already underway. If you wish to restart SMP, send a +type 6 TLV (SMP abort) to the other party and then proceed as if +smpstate was SMPSTATE_EXPECT1. Otherwise, you may simply continue the +current SMP instance.</dd> +<dt>If smpstate is set to SMPSTATE_EXPECT1:</dt> +<dd>No current exchange is underway. In this case, Alice should +create a valid type 2 TLV (SMP message 1) as follows: +<ol> +<li>Determine her secret input x, which is to be compared to Bob's +secret y.</li> +<li>Pick random values a<sub>2</sub> and a<sub>3</sub> (1536 bits). +These will be Alice's exponents for the DH exchange to pick generators.</li> +<li>Pick random values r2 and r3 (1536 bits). +These will be used to generate zero-knowledge proofs that this message +was created according to the protocol.</li> +<li>Compute g<sub>2a</sub> = g<sub>1</sub><sup>a<sub>2</sub></sup> and +g<sub>3a</sub> = g<sub>1</sub><sup>a<sub>3</sub></sup></li> +<li>Generate a zero-knowledge proof that the exponent a<sub>2</sub> is +known by setting c2 = SHA256(1, g<sub>1</sub><sup>r2</sup>) and +D2 = r2 - a<sub>2</sub> c2 mod q.</li> +<li>Generate a zero-knowledge proof that the exponent a<sub>3</sub> is +known by setting c3 = SHA256(2, g<sub>1</sub><sup>r3</sup>) and +D3 = r3 - a<sub>3</sub> c3 mod q.</li> +<li>Store the values of x, a<sub>2</sub> and a<sub>3</sub> +for use later in the protocol.</li> +<li>Send Bob a type 2 TLV (SMP message 1) containing g<sub>2a</sub>, +c2, D2, g<sub>3a</sub>, c3 and D3 in that order.</li> +</ol> +Set smpstate to SMPSTATE_EXPECT2.</dd> +</dl> +<h4>User requests to abort SMP</h4> +<p>In all cases, send a type 6 TLV (SMP abort) to the correspondent and +set smpstate to SMPSTATE_EXPECT1.</p> +<h3>Key Management</h3> +<p>For each correspondent, keep track of:</p> +<dl> +<dt>Your two most recent DH public/private key pairs</dt> +<dd>our_dh[our_keyid] (most recent) and our_dh[our_keyid-1] (previous)</dd> +<dt>His two most recent DH public keys</dt> +<dd>their_y[their_keyid] (most recent) and their_y[their_keyid-1] +(previous)</dd> +</dl> + +<p>When starting a private conversation with a correspondent, generate +two DH key pairs for yourself, and set our_keyid = 2. Note that all DH +key pairs should have a private part that is at least 320 bits long.</p> + +<dl class="doublespace"> +<dt>When you send AKE messages:</dt> +<dd>Send the public part of our_dh[our_keyid-1], with the keyid field, + of course, set to (our_keyid-1).</dd> + +<dt>Upon completing the AKE:</dt> +<dd>If the specified keyid equals either their_keyid or their_keyid-1, + and the DH pubkey contained in the AKE messages matches the + one you've stored for that keyid, that's great. Otherwise, forget + all values of their_y[], and of their_keyid, and set their_keyid to + the keyid value given in the AKE messages, and + their_y[their_keyid] to the DH pubkey value given in the AKE + messages. their_y[their_keyid-1] should be set to NULL.</dd> + +<dt>When you send a Data Message:</dt> +<dd>Set the sender keyid to (our_keyid-1), and the recipient keyid to + (their_keyid). Set the DH pubkey in the Data message to the public + part of our_dh[our_keyid]. Use our_dh[our_keyid-1] and + their_y[their_keyid] to calculate session keys, as outlined below. + Use the "sending AES key" to encrypt the message, and the "sending + MAC key" to calculate its MAC.</dd> + +<dt>When you receive a Data Message:</dt> +<dd>Use the keyids in the message to select which of your DH key pairs + and which of his DH pubkeys to use to verify the MAC. If the keyids + do not represent either the most recent key or the previous key (for + either the sender or receiver), reject the message. Also reject the + message if the sender keyid is their_keyid-1, but + their_y[their_keyid-1] is NULL. + + <p>Otherwise, calculate the session keys as outlined below. Use the + "receiving MAC key" to verify the MAC on the message. If it does not + verify, reject the message.</p> + + <p>Check that the counter in the Data message is strictly larger than the + last counter you saw using this pair of keys. If not, reject the + message.</p> + + <p>If the MAC verifies, decrypt the message using the "receiving AES + key".</p> + + <p>Finally, check if keys need rotation:</p> + <ul> + <li>If the "recipient keyid" in the Data message equals our_keyid, then + he's seen the public part of our most recent DH key pair, so you + must securely forget our_dh[our_keyid-1], increment our_keyid, and set + our_dh[our_keyid] to a new DH key pair which you generate.</li> + <li>If the "sender keyid" in the Data message equals their_keyid, + increment their_keyid, and set their_y[their_keyid] to the new DH + pubkey specified in the Data message.</li> + </ul></dd> +</dl> + +<h4>Computing AES keys, MAC keys, and the secure session id</h4> +<p>OTR uses Diffie-Hellman to calculate shared secrets in the usual way: +if Bob knows x, and tells Alice g<sup>x</sup>, and Alice knows y, and +tells Bob g<sup>y</sup>, then they each can calculate s = +g<sup>xy</sup>: Alice calculates (g<sup>x</sup>)<sup>y</sup>, and Bob +calculates (g<sup>y</sup>)<sup>x</sup>.</p> +<p>During the AKE, Alice and Bob each calculate s in this way, and then +they each compute seven values based on s:</p> +<ul> +<li>A 64-bit secure session id, ssid</li> +<li>Two 128-bit AES encryption keys, c and c'</li> +<li>Four 256-bit SHA256-HMAC keys, m1, m2, m1', and m2'</li> +</ul> +<p>This is done in the following way:</p> +<ul> +<li>Write the value of s as a minimum-length MPI, as specified above +(4-byte big-endian len, len-byte big-endian value). Let this +(4+len)-byte value be "secbytes".</li> +<li>For a given byte b, define h2(b) to be the 256-bit output of the +SHA256 hash of the (5+len) bytes consisting of the byte b followed by +secbytes.</li> +<li>Let ssid be the first 64 bits of h2(0x00).</li> +<li>Let c be the first 128 bits of h2(0x01), and let c' be the second +128 bits of h2(0x01).</li> +<li>Let m1 be h2(0x02).</li> +<li>Let m2 be h2(0x03).</li> +<li>Let m1' be h2(0x04).</li> +<li>Let m2' be h2(0x05).</li> +</ul> +<p>c, m1, and m2 are used to create and verify the Reveal Signature +Message; c', m1', and m2' are used to create and verify the Signature +message.</p> +<p>If the user requests to see the secure session id, it should be +displayed as two 32-bit bigendian unsigned values, in C "%08x" format. +If the user transmitted the Reveal Signature message during the AKE that +produced this ssid, then display the first 32 bits in bold, and the +second 32 bits in non-bold. If the user transmitted the Signature +message instead, display the first 32 bits in non-bold, and the +second 32 bits in bold. This session id can be used by the parties to +verify (say, over the telephone, assuming the parties recognize each +others' voices) that there is no man-in-the-middle by having each side +read his bold part to the other. [Note that this only needs to be done +in the event that the users do not trust that their long-term signature +keys have not been compromised.]</p> +<p>During the exchange of Data Messages, Alice and Bob use the keyids +listed in the Data Message to select Diffie-Hellman keys to use to +compute s, and the (4+len)-byte value of secbytes, as above.</p> +<p>From this, they calculate four values:</p> +<ul> +<li>Two 128-bit AES encryption keys, the "sending AES key", and the +"receiving AES key"</li> +<li>Two 160-bit SHA1-HMAC keys, the "sending MAC key", and the +"receiving MAC key"</li> +</ul> +<p>These keys are calculated as follows:</p> +<ul> +<li>Alice (and similarly for Bob) determines if she is the "low" end +or the "high" end of this Data Message. If Alice's public key is +numerically greater than Bob's public key, then she +is the "high" end. Otherwise, she is the "low" end. Note that who is the +"low" end and who is the "high" end can change every time a new D-H +public key is exchanged in a Data Message.</li> +<li>She sets the values of "sendbyte" and "recvbyte" according to +whether she is the the "low" or the "high" end of the Data Message: +<ul> +<li>If she is the "high" end, she sets "sendbyte" to 0x01 and "recvbyte" +to 0x02.</li> +<li>If she is the "low" end, she sets "sendbyte" to 0x02 and "recvbyte" +to 0x01.</li> +</ul></li> +<li>For a given byte b, define h1(b) to be the 160-bit output of the +SHA-1 hash of the (5+len) bytes consisting of the byte b, followed by +secbytes.</li> +<li>The "sending AES key" is the first 16 bytes of h1(sendbyte).</li> +<li>The "sending MAC key" is the 20-byte SHA-1 hash of the 16-byte +sending AES key.</li> +<li>The "receiving AES key" is the first 16 bytes of h1(recvbyte).</li> +<li>The "receiving MAC key" is the 20-byte SHA-1 hash of the 16-byte +receiving AES key.</li> +</ul> +<h4>Extra symmetric key</h4> +<p>OTR version 3 defines an additional symmetric key that can be derived +by the communicating parties to use for application-specific purposes, +such as file transfer, voice encryption, etc. When one party wishes to +use the extra symmetric key, he or she creates a type 8 TLV attached to +a Data Message (see above). The key itself is then derived using the +same "secbytes" used to compute the encryption and MAC keys used to +protect the Data Message. +The extra symmetric key is derived by calculating +h2(0xFF) and keeping the entire 256 bits, using the same definition +of h2 as above.</p> +<p>Upon receipt of the Data Message containing the type 8 TLV, the +recipient will compute the extra symmetric key in the same way. Note +that the value of the extra symmetric key is <em>not</em> contained in +the TLV itself.</p> +<h4>Revealing MAC keys</h4> +<p>Whenever you are about to forget either one of your old D-H key pairs, or +one of your correspondent's old D-H public keys, take all of the +receiving MAC keys +that were generated by that key (note that there are up to two: the +receiving MAC keys produced by the pairings of that key with +each of two of the other side's keys; but note that you only need to +take MAC keys that were actually used to verify a MAC on a message), and +put them (as a set of +concatenated 20-byte values) into the "Old MAC keys to be revealed" +section of the next Data Message you send. This in done to allow the +forgeability of OTR transcripts: once the MAC keys are revealed, anyone +can modify an OTR message and still have it appear valid. But since we +don't reveal the MAC keys until their corresponding pubkeys are being +discarded, there is no danger of accepting a message as valid which +uses a MAC key which has already been revealed.</p> +<h3>Fragmentation</h3> +<p>Some networks may have a maximum message size that is too small to +contain an encoded OTR message. In that event, the sender may choose +to split the message into a number of <em>fragments</em>. This section +describes the format of the fragments. All OTR version 2 and 3 clients +must be able to assemble received fragments, but performing +fragmentation on outgoing messages is optional.</p> + +<dl class="doublespace"> +<dt>Transmitting Fragments</dt> +<dd>If you have information about the maximum size of message you are + able to send (the different IM networks have different limits), you + can fragment an encoded OTR message as follows: + <ul> + <li>Start with the OTR message as you would normally transmit it. For + example, a Data Message would start with "?OTR:AAED" and end + with ".".</li> + <li>Break it up into sufficiently small pieces. Let the number of + pieces be (n), and the pieces be + piece[1],piece[2],...,piece[n].</li> + <li>Transmit (n) OTR version 3 fragmented messages with the following + (printf-like) structure (as k runs from 1 to n inclusive): + + <p>"?OTR|%x|%x,%hu,%hu,%s," , sender_instance, receiver_instance, + k , n , piece[k]</p> + + OTR version 2 messages get fragmented in a similar format, but + without the instance tags fields: + + <p>"?OTR,%hu,%hu,%s," , + k , n , piece[k]</p></li> + + <li>Note that k and n are unsigned short ints (2 bytes), and each has + a maximum value of 65535. Also, each piece[k] must be + non-empty.</li> + </ul> + <p>Note that fragments are not themselves messages that can be + fragmented: you can't fragment a fragment.</p></dd> + +<dt>Receiving Fragments:</dt> + +<dd>If you receive a message containing "?OTR|" (note that you'll need + to check for this _before_ checking for any of the other "?OTR:" + markers): + + <ul> + <li>Parse it as the printf statement above into k, n, and + piece.</li> + <li>If the recipient's own instance tag does not match the listed + receiver instance tag, and the listed receiver instance tag is not + zero, the recipient should discard the message and optionally pass + along a warning for the user.</li> + <li>Let (K,N) be your currently stored fragment number, and F be your + currently stored fragment. [If you have no currently stored + fragment, then K = N = 0 and F = "".]</li> + + <li>If k == 0 or n == 0 or k > n, discard this (illegal) + fragment.</li> + + <li>If k == 1: + <ul> + <li>Forget any stored fragment you may have</li> + <li>Store (piece) as F.</li> + <li>Store (k,n) as (K,N).</li> + </ul></li> + + <li>If n == N and k == K+1: + <ul> + <li>Append (piece) to F.</li> + <li>Store (k,n) as (K,N).</li> + </ul></li> + + <li>Otherwise: + <ul> + <li>Forget any stored fragment you may have</li> + <li>Store "" as F.</li> + <li>Store (0,0) as (K,N).</li> + </ul></li> + </ul> + + <p>After this, if N > 0 and K == N, treat F as the received + message.</p> + + <p>If you receive a non-OTR message, or an unfragmented message, + forget any stored fragment you may have, store "" as F and store + (0,0) as (K,N).</p> + + <p>OTR version 2 fragmented messages follow the same behaviour as + described above, but do not list the sender and receiver instance + tags.</dd> +</dl> + +<p>For example, here is a Data Message we would like to transmit over a +network with an unreasonably small maximum message size:</p> + +<blockquote><pre> +?OTR:AAMDJ+MVmSfjFZcAAAAAAQAAAAIAAADA1g5IjD1ZGLDVQEyCgCyn9hb +rL3KAbGDdzE2ZkMyTKl7XfkSxh8YJnudstiB74i4BzT0W2haClg6dMary/jo +9sMudwmUdlnKpIGEKXWdvJKT+hQ26h9nzMgEditLB8vjPEWAJ6gBXvZrY6ZQ +rx3gb4v0UaSMOMiR5sB7Eaulb2Yc6RmRnnlxgUUC2alosg4WIeFN951PLjSc +ajVba6dqlDi+q1H5tPvI5SWMN7PCBWIJ41+WvF+5IAZzQZYgNaVLbAAAAAAA +AAAEAAAAHwNiIi5Ms+4PsY/L2ipkTtquknfx6HodLvk3RAAAAAA==. +</pre></blockquote> + + <p>We could fragment this message into (for example) three + pieces:</p> + +<blockquote><pre> +?OTR|5a73a599|27e31597,00001,00003,?OTR:AAMDJ+MVmSfjFZcAAAAA +AQAAAAIAAADA1g5IjD1ZGLDVQEyCgCyn9hbrL3KAbGDdzE2ZkMyTKl7XfkSx +h8YJnudstiB74i4BzT0W2haClg6dMary/jo9sMudwmUdlnKpIGEKXWdvJKT+ +hQ26h9nzMgEditLB8v, +</pre></blockquote> + +<blockquote><pre> +?OTR|5a73a599|27e31597,00002,00003,jPEWAJ6gBXvZrY6ZQrx3gb4v0 +UaSMOMiR5sB7Eaulb2Yc6RmRnnlxgUUC2alosg4WIeFN951PLjScajVba6dq +lDi+q1H5tPvI5SWMN7PCBWIJ41+WvF+5IAZzQZYgNaVLbAAAAAAAAAAEAAAA +HwNiIi5Ms+4PsY/L2i, +</pre></blockquote> + +<blockquote><pre> +?OTR|5a73a599|27e31597,00003,00003,pkTtquknfx6HodLvk3RAAAAAA +==., +</pre></blockquote> +<h3>The protocol state machine</h3> +<p>An OTR client maintains separate state for every correspondent. For +example, Alice may have an active OTR conversation with Bob, while +having an unprotected conversation with Charlie. This state consists of +two main state variables, as well as some other information (such as +encryption keys). The two main state variables are:</p> +<h4>Message state</h4> +<p>The message state variable, msgstate, controls what happens to +outgoing messages typed by the user. It can take one of three +values:</p> +<dl> +<dt>MSGSTATE_PLAINTEXT</dt> +<dd>This state indicates that outgoing messages are sent without +encryption. This is the state that is used before an OTR conversation +is initiated. This is the initial state, and the only way to +subsequently enter this state is for the user to explicitly request to +do so via some UI operation.</dd> +<dt>MSGSTATE_ENCRYPTED</dt> +<dd>This state indicates that outgoing messages are sent encrypted. +This is the state that is used during an OTR conversation. The only way +to enter this state is for the authentication state machine (below) to +successfully complete.</dd> +<dt>MSGSTATE_FINISHED</dt> +<dd>This state indicates that outgoing messages are not delivered at +all. This state is entered only when the other party indicates he has +terminated his side of the OTR conversation. For example, if Alice and +Bob are having an OTR conversation, and Bob instructs his OTR client to +end its private session with Alice (for example, by logging out), Alice +will be notified of this, and <em>her</em> client will switch to +MSGSTATE_FINISHED mode. This prevents Alice from accidentally sending a +message to Bob in plaintext. (Consider what happens if Alice was in the +middle of typing a private message to Bob when he suddenly logs out, +just as Alice hits Enter.)</dd> +</dl> +<h4>Authentication state</h4> +<p>The authentication state variable, authstate, can take one of four +values (plus one extra for OTR version 1 compatibility):</p> +<dl> +<dt>AUTHSTATE_NONE</dt> +<dd>This state indicates that the authentication protocol is not +currently in progress. This is the initial state.</dd> +<dt>AUTHSTATE_AWAITING_DHKEY</dt> +<dd>After Bob initiates the authentication protocol by sending Alice +the D-H Commit Message, he enters this state to await Alice's reply.</dd> +<dt>AUTHSTATE_AWAITING_REVEALSIG</dt> +<dd>After Alice receives Bob's D-H Commit Message, and replies with her +own D-H Key Message, she enters this state to await Bob's reply.</dd> +<dt>AUTHSTATE_AWAITING_SIG</dt> +<dd>After Bob receives Alice's D-H Key Message, and replies with his own +Reveal Signature Message, he enters this state to await Alice's reply.</dd> +<dt>AUTHSTATE_V1_SETUP</dt> +<dd>For OTR version 1 compatibility, if Bob sends a version 1 Key +Exchange Message to Alice, he enters this state to await Alice's +reply.</dd> +</dl> +<p>After:</p> +<ul> +<li>Alice (in AUTHSTATE_AWAITING_REVEALSIG) receives Bob's Reveal +Signature Message (and replies with her own Signature Message), <b>or</b> +</li> +<li>Bob (in AUTHSTATE_AWAITING_SIG) receives Alice's Signature Message, +/li> +</ul> +<p>then, +assuming the signature verifications succeed, the msgstate +variable is transitioned to MSGSTATE_ENCRYPTED. Regardless of whether +the signature verifications succeed, the authstate variable is +transitioned to AUTHSTATE_NONE.</p> +<h4>Policies</h4> +<p>OTR clients can set different <b>policies</b> for different +correspondents. For example, Alice could set up her client so that it +speaks only OTR version 3, except with Charlie, who she knows has only +an old client; so that it will opportunistically start an OTR conversation +whenever it detects the correspondent supports it; or so that it refuses +to send non-encrypted messages to Bob, ever.</p> +<p>The policies that can be set (on a global or per-correspondent basis) +are any combination of the following boolean flags:</p> +<dl> +<dt>ALLOW_V1</dt> +<dd>Allow version 1 of the OTR protocol to be used (in general this +document will not address OTR protocol version 1; see previous +protocol documents for these details).</dd> +<dt>ALLOW_V2</dt> +<dd>Allow version 2 of the OTR protocol to be used.</dd> +<dt>ALLOW_V3</dt> +<dd>Allow version 3 of the OTR protocol to be used.</dd> +<dt>REQUIRE_ENCRYPTION</dt> +<dd>Refuse to send unencrypted messages.</dd> +<dt>SEND_WHITESPACE_TAG</dt> +<dd>Advertise your support of OTR using the whitespace tag.</dd> +<dt>WHITESPACE_START_AKE</dt> +<dd>Start the OTR AKE when you receive a whitespace tag.</dd> +<dt>ERROR_START_AKE</dt> +<dd>Start the OTR AKE when you receive an OTR Error Message.</dd> +</dl> +<p>Note that it is possible for UIs simply to offer the old +"combinations" of options, and not ask about each one separately.</p> +<h4>State transitions</h4> +<p>There are twelve actions an OTR client must handle:</p> +<ul> +<li>Received messages: +<ul> +<li>Plaintext without the whitespace tag</li> +<li>Plaintext with the whitespace tag</li> +<li>Query Message</li> +<li>Error Message</li> +<li>D-H Commit Message</li> +<li>D-H Key Message</li> +<li>Reveal Signature Message</li> +<li>Signature Message</li> +<li>Data Message</li> +</ul></li> +<li>User actions: +<ul> +<li>User requests to start an OTR conversation</li> +<li>User requests to end an OTR conversation</li> +<li>User types a message to be sent</li> +</ul></li> +</ul> +<p>The following sections will outline what actions to take in each +case. They all assume that at least one of ALLOW_V1, ALLOW_V2 or +ALLOW_V3 is set; if not, then OTR is completely disabled, and no +special handling of messages should be done at all. For version 1 +messages, please refer to previous OTR protocol documents. For version +3 messages, someone receiving a message with a recipient instance tag +specified that does not equal their own should discard the message +and optionally warn the user. The exception here is the D-H Commit +Message where the recipient instance tag may be 0, indicating that no +particular instance is specified.</p> +<h4>Receiving plaintext without the whitespace tag</h4> +<dl> +<dt>If msgstate is MSGSTATE_PLAINTEXT:</dt> +<dd>Simply display the message to the user. If REQUIRE_ENCRYPTION is +set, warn him that the message was received unencrypted.</dd> +<dt>If msgstate is MSGSTATE_ENCRYPTED or MSGSTATE_FINISHED:</dt> +<dd>Display the message to the user, but warn him that the message was +received unencrypted.</dd> +</dl> +<h4>Receiving plaintext with the whitespace tag</h4> +<dl> +<dt>If msgstate is MSGSTATE_PLAINTEXT:</dt> +<dd>Remove the whitespace tag and display the message to the user. If +REQUIRE_ENCRYPTION is set, warn him that the message was received +unencrypted.</dd> +<dt>If msgstate is MSGSTATE_ENCRYPTED or MSGSTATE_FINISHED:</dt> +<dd>Remove the whitespace tag and display the message to the user, but +warn him that the message was received unencrypted.</dd> +</dl> +<p>In any event, if WHITESPACE_START_AKE is set:</p> +<dl> +<dt>If the tag offers OTR version 3 and ALLOW_V3 is set:</dt> +<dd>Send a version 3 D-H Commit Message, and transition authstate to +AUTHSTATE_AWAITING_DHKEY.</dd> +<dt>Otherwise, if the tag offers OTR version 2 and ALLOW_V2 is set:</dt> +<dd>Send a version 2 D-H Commit Message, and transition authstate to +AUTHSTATE_AWAITING_DHKEY.</dd> +</dl> +<h4>Receiving a Query Message</h4> +<dl> +<dt>If the query message offers OTR version 3 and ALLOW_V3 is set:</dt> +<dd>Send a version 3 D-H Commit Message, and transition authstate to +AUTHSTATE_AWAITING_DHKEY.</dd> +<dt>Otherwise, if the message offers OTR version 2 and ALLOW_V2 is set:</dt> +<dd>Send a version 2 D-H Commit Message, and transition authstate to +AUTHSTATE_AWAITING_DHKEY.</dd> +</dl> +<h4>Receiving an Error Message</h4> +<p>Display the message to the user. If ERROR_START_AKE is set, reply +with a Query Message.</p> +<h4>User requests to start an OTR conversation</h4> +<p>Send an OTR Query Message to the correspondent.</p> +<h4>Receiving a D-H Commit Message</h4> +<p>If the message is version 2 and ALLOW_V2 is not set, ignore this message. +Similarly if the message is version 3 and ALLOW_V3 is not set, ignore the +message. Otherwise:</p> +<dl> +<dt>If authstate is AUTHSTATE_NONE:</dt> +<dd>Reply with a D-H Key Message, and transition authstate to +AUTHSTATE_AWAITING_REVEALSIG.</dd> +<dt>If authstate is AUTHSTATE_AWAITING_DHKEY:</dt> +<dd>This is the trickiest transition in the whole protocol. It +indicates that you have already sent a D-H Commit message to your +correspondent, but that he either didn't receive it, or just didn't +receive it <em>yet</em>, and has sent you one as well. The symmetry +will be broken by comparing the hashed g<sup>x</sup> you sent in your +D-H Commit Message with the one you received, considered as 32-byte +unsigned big-endian values. +<dl> +<dt>If yours is the higher hash value:</dt> +<dd>Ignore the incoming D-H Commit message, but resend your D-H +Commit message.</dd> +<dt>Otherwise:</dt> +<dd>Forget your old g<sup>x</sup> value that you sent (encrypted) +earlier, and pretend you're in AUTHSTATE_NONE; i.e. reply with a D-H Key +Message, and transition authstate to AUTHSTATE_AWAITING_REVEALSIG.</dd> +</dl></dd> +<dt>If authstate is AUTHSTATE_AWAITING_REVEALSIG:</dt> +<dd>Retransmit your D-H Key Message (the same +one as you sent when you entered AUTHSTATE_AWAITING_REVEALSIG). Forget +the old D-H Commit message, and use this new one instead. There +are a number of reasons this might happen, including: +<ul> +<li>Your correspondent simply started a new AKE.</li> +<li>Your correspondent resent his D-H Commit message, as specified +above.</li> +<li>On some networks, like AIM, if your correspondent is logged in +multiple times, each of his clients will send a D-H Commit Message in +response to a Query Message; resending the same D-H Key Message in +response to each of those messages will prevent compounded confusion, +since each of his clients will see each of the D-H Key Messages you +send. [And the problem gets even worse if you are <em>each</em> logged +in multiple times.]</li> +</ul></dd> +<dt>If authstate is AUTHSTATE_AWAITING_SIG or AUTHSTATE_V1_SETUP:</dt> +<dd>Reply with a new D-H Key message, and transition authstate to +AUTHSTATE_AWAITING_REVEALSIG.</dd> +</dl> +<h4>Receiving a D-H Key Message</h4> +<p>If the message is version 2 and ALLOW_V2 is not set, ignore this +message. Similarly if the message is version 3 and ALLOW_V3 is not +set, ignore this message. Otherwise:</p> +<dl> +<dt>If authstate is AUTHSTATE_AWAITING_DHKEY:</dt> +<dd>Reply with a Reveal Signature Message and transition authstate to +AUTHSTATE_AWAITING_SIG.</dd> +<dt>If authstate is AUTHSTATE_AWAITING_SIG:</dt> +<dd> +<dl> +<dt>If this D-H Key message is the same the one you received earlier +(when you entered AUTHSTATE_AWAITING_SIG):</dt> +<dd>Retransmit your Reveal Signature Message.</dd> +<dt>Otherwise:</dt> +<dd>Ignore the message.</dd> +</dl></dd> +<dt>If authstate is AUTHSTATE_NONE, AUTHSTATE_AWAITING_REVEALSIG, or +AUTHSTATE_V1_SETUP:</dt> +<dd>Ignore the message.</dd> +</dl> +<h4>Receiving a Reveal Signature Message</h4> +<p>If ALLOW_V2 is not set, ignore this message. Otherwise:</p> +<dl> +<dt>If authstate is AUTHSTATE_AWAITING_REVEALSIG:</dt> +<dd>Use the received value of r to decrypt the value of g<sup>x</sup> +received in the D-H Commit Message, and verify the hash therein. +Decrypt the encrypted signature, and verify the signature and the MACs. +If everything checks out: +<ul> +<li>Reply with a Signature Message.</li> +<li>Transition authstate to AUTHSTATE_NONE.</li> +<li>Transition msgstate to MSGSTATE_ENCRYPTED.</li> +<li>If there is a recent stored message, encrypt it and send it as a +Data Message.</li> +</ul> +Otherwise, ignore the message.</dd> +<dt>If authstate is AUTHSTATE_NONE, AUTHSTATE_AWAITING_DHKEY, +AUTHSTATE_AWAITING_SIG, or AUTHSTATE_V1_SETUP:</dt> +<dd>Ignore the message.</dd> +</dl> +<h4>Receiving a Signature Message</h4> +<p>If ALLOW_V2 is not set, ignore this message. Otherwise:</p> +<dl> +<dt>If authstate is AUTHSTATE_AWAITING_SIG:</dt> +<dd>Decrypt the encrypted signature, and verify the signature and the MACs. +If everything checks out: +<ul> +<li>Transition authstate to AUTHSTATE_NONE.</li> +<li>Transition msgstate to MSGSTATE_ENCRYPTED.</li> +<li>If there is a recent stored message, encrypt it and send it as a +Data Message.</li> +</ul> +Otherwise, ignore the message.</dd> +<dt>If authstate is AUTHSTATE_NONE, AUTHSTATE_AWAITING_DHKEY, +or AUTHSTATE_AWAITING_REVEALSIG:</dt> +<dd>Ignore the message.</dd> +</dl> +<h4>User types a message to be sent</h4> +<dl> +<dt>If msgstate is MSGSTATE_PLAINTEXT:</dt> +<dd><dl><dt>If REQUIRE_ENCRYPTION is set:</dt> +<dd>Store the plaintext message for possible retransmission, and send a +Query Message.</dd> +<dt>Otherwise:</dt> +<dd>If SEND_WHITESPACE_TAG is set, and you have not received a plaintext +message from this correspondent since last entering MSGSTATE_PLAINTEXT, +attach the whitespace tag to the message. Send the (possibly modified) +message as plaintext.</dd></dl></dd> +<dt>If msgstate is MSGSTATE_ENCRYPTED:</dt> +<dd>Encrypt the message, and send it as a Data Message. Store the +plaintext message for possible retransmission.</dd> +<dt>If msgstate is MSGSTATE_FINISHED:</dt> +<dd>Inform the user that the message cannot be sent at this time. Store +the plaintext message for possible retransmission.</dd> +</dl> +<h4>Receiving a Data Message</h4> +<dl> +<dt>If msgstate is MSGSTATE_ENCRYPTED:</dt> +<dd>Verify the information (MAC, keyids, ctr value, etc.) in the +message. +<dl> +<dt>If the verification succeeds:</dt> +<dd> +<ul> +<li>Decrypt the message and display the human-readable part (if +non-empty) to the user.</li> +<li>Update the D-H encryption keys, if necessary.</li> +<li>If you have not sent a message to this correspondent in some +(configurable) time, send a "heartbeat" message, consisting of a Data +Message encoding an empty plaintext. The heartbeat message should have +the IGNORE_UNREADABLE flag set.</li> +<li>If the received message contains a TLV type 1, forget all encryption +keys for this correspondent, and transition msgstate to +MSGSTATE_FINISHED.</li> +</ul> +</dd> +<dt>Otherwise, inform the user that an unreadable encrypted message was +received, and reply with an Error Message.</dt> +</dl></dd> +<dt>If msgstate is MSGSTATE_PLAINTEXT or MSGSTATE_FINISHED:</dt> +<dd>Inform the user that an unreadable encrypted message was received, +and reply with an Error Message.</dd> +</dl> +<h4>User requests to end an OTR conversation</h4> +<dl> +<dt>If msgstate is MSGSTATE_PLAINTEXT:</dt> +<dd>Do nothing.</dd> +<dt>If msgstate is MSGSTATE_ENCRYPTED:</dt> +<dd>Send a Data Message, encoding a message with an empty human-readable +part, and TLV type 1. Transition msgstate to MSGSTATE_PLAINTEXT.</dd> +<dt>If msgstate is MSGSTATE_FINISHED:</dt> +<dd>Transition msgstate to MSGSTATE_PLAINTEXT.</dd> +</dl> +</body></html> diff --git a/plugins/MirOTR/libotr/read/README b/plugins/MirOTR/libotr/read/README index 0b87bccf88..1dd7268291 100644 --- a/plugins/MirOTR/libotr/read/README +++ b/plugins/MirOTR/libotr/read/README @@ -1,5 +1,5 @@ Off-the-Record Messaging Library and Toolkit - v3.2.0, 15 Jun 2008 + v4.1.0, 21 Oct 2014 This is a library and toolkit which implements Off-the-Record (OTR) Messaging. @@ -19,7 +19,7 @@ OTR allows you to have private conversations over IM by providing: is compromised. For more information on Off-the-Record Messaging, see -http://otr.cypherpunks.ca/ +https://otr.cypherpunks.ca/ LIBRARY USAGE @@ -37,7 +37,7 @@ You will also need an OtrlUserState. An OtrlUserState encapsulates the list of known fingerprints and the list of private keys, so it should be "one per user". Many OTR-enabled programs (such as IM clients) only have a single user, so for them, you can just create a single one, and use it -thoughout. Create an OtrlUserState as follows: +throughout. Create an OtrlUserState as follows: userstate = otrl_userstate_create(); @@ -49,6 +49,10 @@ To read stored private keys: otrl_privkey_read(userstate, privkeyfilename); +To read stored instance tags: + + otrl_instag_read(userstate, instagfilename); + To read stored fingerprints: otrl_privkey_read_fingerprints(userstate, fingerprintfilename, @@ -80,8 +84,14 @@ of the UI functions in message.h. 3. Sending messages When you have a message you're about to send, you'll need to know four -things: you account name, the protocol id, the name of the recipient, and -the message. +things: you account name, the protocol id, the name of the recipient, +their instance tag, and the message. + +OTR protocol version 3 introduces the notion of "instance tags." A +client may be logged into the same account multiple times from different +locations. An instance tag is intended to differentiate these clients. +When sending a message, you may also specify a particular instance tag, +or use meta instance tags like OTRL_INSTAG_MOST_SECURE. The protocol id is just a unique string that is used to distinguish the user foo on AIM from the user foo on MSN, etc. It can be anything @@ -108,8 +118,9 @@ next function), simply do this: char *newmessage = NULL; err = otrl_message_sending(userstate, &ui_ops, opdata, accountname, - protocolid, recipient_name, message, tlvs, &newmessage, - add_app_info, add_app_info_data); + protocolid, recipient_name, instag, message, tlvs, + &newmessage, fragPolicy, contextp, add_app_info, + add_app_info_data); add_app_info and add_app_info_data are as above, and may be NULL. @@ -117,6 +128,9 @@ tlvs should usually be NULL. If it's not, then it points to a chain of OtrlTLVs which represent machine-readable data to send along with this message. +If contextp is not NULL, it will be set to the context that was used +for sending the message. + If err is non-zero, then the library tried to encrypt the message, but for some reason failed. DO NOT send the message in the clear in that case. @@ -160,10 +174,13 @@ and the message. ignore_message = otrl_message_receiving(userstate, &ui_ops, opdata, accountname, protocolid, sender_name, message, &newmessage, - &tlvs, add_app_info, add_app_info_data); + &tlvs, contextp, add_app_info, add_app_info_data); add_app_info and add_app_info_data are as above, and may be NULL. +If contextp is not NULL, it will be set to the context that was used +for receiving the message. + If otrl_message_receiving returns 1, then the message you received was an internal protocol message, and no message should be delivered to the user. @@ -235,7 +252,8 @@ Here are the six programs in the toolkit: you can still forge messages of your choice using the otr_readforge command, above. - - otr_remac mackey flags keyid keyid pubkey counter encdata revealed_mackeys + - otr_remac mackey sender_instance receiver_instance flags keyid keyid + pubkey counter encdata revealed_mackeys - Make a new OTR Data Message, with the given pieces (note that the data part is already encrypted). MAC it with the given mackey. @@ -244,21 +262,45 @@ NOTES Please send your bug reports, comments, suggestions, patches, etc. to us at the contact address below. +In otrl_message_sending, specifying an instance tag allows you to send a +message to a particular session of a buddy who is logged in multiple times +with an otr-enabled client. The OTRL_INSTAG_RECENT_RECEIVED meta-instance +relies on the time that libotr processed the most recent message. Meta- +instance tags resolve to actual instance tags before a message is sent. An +instant messaging network may not agree on which session of the remote party is +the most recent, e.g., due to underlying network race conditions. If the +behaviour of an instant messaging network is to only deliver to the most recent, +and libotr and the network disagree on which session is the most recent, the +other party will not process the given message. That is, the instant messaging +network will deliver the message to the session whose actual instance tag does +not match the addressed instance tag. Also note that OTRL_INSTAG_BEST also +prefers more recent instance tags in the case of multiple instances with the +same "best" status (most secure). In this case, the most recent has a +resolution of one second. + +If otrl_message_sending is called with an original_msg that contains the text +"?OTR?", this is a signal to initiate or refresh an OTR session. There is +currently no way to indicate if this text was actually typed in by a user and +part of a conversation (e.g., someone communicating instructions on how to +refresh OTR). In the future, we may allow a policy to specify whether "?OTR?" +is a signal to start OTR, or just an ordinary message for encrypted and +unencrypted conversations. + MAILING LISTS There are three mailing lists pertaining to Off-the-Record Messaging: otr-announce: - http://lists.cypherpunks.ca/mailman/listinfo/otr-announce/ + https://lists.cypherpunks.ca/mailman/listinfo/otr-announce/ *** All users of OTR software should join this. *** It is used to announce new versions of OTR software, and other important information. otr-users: - http://lists.cypherpunks.ca/mailman/listinfo/otr-users/ + https://lists.cypherpunks.ca/mailman/listinfo/otr-users/ Discussion of usage issues related to OTR Messaging software. otr-dev: - http://lists.cypherpunks.ca/mailman/listinfo/otr-dev/ + https://lists.cypherpunks.ca/mailman/listinfo/otr-dev/ Discussion of OTR Messaging software development. LICENSE @@ -267,7 +309,9 @@ The Off-the-Record Messaging library (in the src directory) is covered by the following (LGPL) license: Off-the-Record Messaging library - Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + Chris Alexander, Willy Lew, Lisa Du, + Nikita Borisov <otr@cypherpunks.ca> This library is free software; you can redistribute it and/or @@ -281,14 +325,34 @@ covered by the following (LGPL) license: There is a copy of the GNU Lesser General Public License in the COPYING.LIB file packaged with this library; if you cannot find it, - write to the Free Software Foundation, Inc., 59 Temple Place, Suite - 330, Boston, MA 02111-1307 USA + write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth + Floor, Boston, MA 02110-1301 USA + +The library comes with a test suite (in the tests directory), which is +covered by the following (GPL) license: + + Copyright (C) 2014 Julien Voisin <julien.voisin@dustri.org>, + David Goulet <dgoulet@ev0ke.net> + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License, version 2 only, as + published by the Free Software Foundation. + + This program is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. + + You should have received a copy of the GNU General Public License along with + this program; if not, write to the Free Software Foundation, Inc., 51 + Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. The Off-the-Record Messaging Toolkit (in the toolkit directory) is covered by the following (GPL) license: Off-the-Record Messaging Toolkit - Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + Chris Alexander, Nikita Borisov <otr@cypherpunks.ca> This program is free software; you can redistribute it and/or modify @@ -302,15 +366,17 @@ by the following (GPL) license: There is a copy of the GNU General Public License in the COPYING file packaged with this toolkit; if you cannot find it, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA + Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301 USA CONTACT To report problems, comments, suggestions, patches, etc., you can email the authors: -Ian Goldberg, Chris Alexander, and Nikita Borisov <otr@cypherpunks.ca> +Ian Goldberg, David Goulet, Rob Smits, Chris Alexander, Lisa Du, +Nikita Borisov +<otr@cypherpunks.ca> For more information on Off-the-Record Messaging, visit -http://otr.cypherpunks.ca/ +https://otr.cypherpunks.ca/ diff --git a/plugins/MirOTR/libotr/read/UPGRADING b/plugins/MirOTR/libotr/read/UPGRADING index 6ca2134665..f7445c3472 100644 --- a/plugins/MirOTR/libotr/read/UPGRADING +++ b/plugins/MirOTR/libotr/read/UPGRADING @@ -2,336 +2,514 @@ Table of Contents 1. Introduction 2. Major Additions -2.1. Fragmentation -2.2. Socialist Millionaires' Protocol +2.1. Instance Tags +2.2. Asynchronous Private Key Generation +2.3. Extra Symmetric Key +2.4. Convert Operations +2.5. SMP, Error, and Message Event Callbacks +2.6. Fragmentation Changes 3. Required Changes 3.1. OtrlMessageAppOps Callbacks -3.1.1. Max Message Size -3.1.2. Account Name -3.2. Using Fragmentation -3.3. Using SMP -3.3.1. Initiating -3.3.2. Responding -3.3.3. Aborting -3.3.4. Control Flow and Errors -3.4. Miscellaneous +3.1.1. Removed Operations +3.1.2. Added Operations +3.2. Instance Tags +3.3. Fragmentation Changes +3.4. Asynchronous Private Key Generation +3.5. Library Initialization 1. Introduction -This file contains information about the changes between the 3.0.0 and -the 3.2.0 APIs for libotr. Note that, as a minor release, applications -compiled against 3.0.0 will continue to work with 3.2.0. This document -explains how to add the new functionality in 3.2.0. +This file contains information about the changes between the 3.2.0 and +the 4.0.0 APIs for libotr. Note that applications compiled against +previous versions of OTR will not work with libotr 4.0.0. 2. Major Additions -This section describes the new features in OTR 3.2.0 along with a short +This section describes the new features in OTR 4.0.0 along with a short history or motivation for each. -2.1. Fragmentation [Added in 3.1.0] - -Most IM networks supported by Pidgin have fixed maximum message sizes -(MMS) of approximately 1-3 kB. The longer messages in the initial key -exchange and the new socialist millionaires' protocol may exceed these -common MMS values. To allow these protocols to work properly even over -networks with low MMS values, support for fragmentation was added. - -OTR version 3.0.0 added support for recombining message fragments to -recover the original message. Now that users may be assumed to be able to -handle message fragments, support for fragmenting and sending large -messages has been added to OTR 3.2.0. - -2.2. Socialist Millionaires' Protocol [Added in 3.1.0, revised in 3.2.0] - -In version 3.0.0, the only method available to authenticate a buddy was -fingerprint verification. However, many users who are unfamiliar with -cryptography do not understand what a fingerprint is or how it is useful. -Also, the verification itself relied on the user obtaining an authentic -copy of the other party's fingerprint somehow. The simplest way to do so -may be to relay the displayed hexadecimal values during a phone call, -but this is a large enough hassle that many users omit fingerprint -verification altogether. - -To allow for a method of authentication that is both easier to understand -and easier to use, OTR version 3.2.0 includes the Socialist Millionaires' -Protocol (SMP). SMP runs as follows: each user inputs a secret string, -say "x" and "y". They then exchange a series of messages which reveal -the value of (x==y), but no additional information about the inputs. -This allows users to determine whether they hold the same secret -information with no danger of revealing that secret to an attacker. - -To see how this is useful for authentication in OTR, assume that Alice -and Bob are chatting over OTR for the first time, though they know each -other well in real life. Alice may send Bob the following message: -"Let's make our shared secret the name of that restaurant we both like -in Ottawa." - -Now Alice and Bob run SMP. If Alice is actually talking to Bob directly, -then they will both type in the same restaurant name and SMP will return -success (x==y). However, if an attacker is impersonating Bob or trying -to eavesdrop on the conversation, they will have no idea which restaurant -Alice has in mind, and will type in an incorrect value, causing SMP to -fail. Note that for security reasons, the values compared in the SMP -are actually hashes of several pieces of data, including both parties' -fingerprints, along with their respective secrets. The users, however, -are never exposed to this additional data. - -Thus, SMP turns the problem of obtaining an authentic copy of a -fingerprint into the much simpler problem of obtaining any shared secret, -or simply of drawing on shared experiences to generate one. - -For detailed information on how SMP works, see the paper by Boudot, -Schoenmakers and Traore titled "A Fair and Efficient Solution to the -Socialist Millionaires Problem" (2001), on which our solution is based. - -3. Required Changes [Added in 3.1.0] +2.1. Instance Tags -3.1. OtrlMessageAppOps Callbacks - -Three new callbacks have been added to the end of OtrlMessageAppOps. If -the version number passed to otrl_init is less than 3.1.0 then libotr will -not call any of the new callbacks. As well, you may disable individual -callbacks by setting them to NULL. In either case, libotr will revert to -the standard behaviour of version 3.0.0. - -3.1.1. Max Message Size +Clients generate instance tags that are intended to be persistent. If +the same client is logged into the same account from multiple locations, +the intention is that he or she will have different instance tags at +each location. OTR wire messages (fragmented and unfragmented) include +the source and destination instance tags. If a client receives a message +that lists a destination instance tag different from his own, the client +will discard it (and issue a callback notifying the application of the +event). -The first new callback has the following signature: +This avoids an issue on IM networks that always relay all messages to +all sessions of a client who is logged in multiple times. In this +situation, OTR clients can attempt to establish an OTR session +indefinitely if there are interleaving messages from each of the +sessions. - int (*max_message_size)(void *opdata, ConnContext *context); +2.2. Asynchronous Private Key Generation -This method is called whenever a message is about to be sent with -fragmentation enabled. The return value is checked against the size of -the message to be sent to determine whether fragmentation is necessary. +Key generation can happen in a separate thread without blocking an +application. -Although the maximum message size depends on a number of factors, we -found experimentally that the following rough values based solely on the -(pidgin) protocol name work well: - "prpl-msn", 1409 - "prpl-icq", 2346 - "prpl-aim", 2343 - "prpl-yahoo", 832 - "prpl-gg", 1999 - "prpl-irc", 417 - "prpl-oscar", 2343 +2.3. Extra Symmetric Key -Setting max_message_size to NULL will disable the fragmentation of all -sent messages; returning 0 from this callback will disable fragmentation -of a particular message. The latter is useful, for example, for -protocols like XMPP (Jabber) that do not require fragmentation at all. +An extra symmetric key is kept synchronized during a conversation with a +buddy. Either side can send a signal that they wish to use this key for +some external purpose (e.g. things like a file transfer, in some other +channel of communication). -3.1.2. Account Name +2.4. Convert Operations -The other two new callbacks have the following signatures: +There is now a callback that is made immediately before a message is +encrypted and immediately after a message is decrypted. This callback +can tweak the plaintext message as needed. For example, this could allow +an application to convert formatting on a message if this would normally +be done on the plaintext by some other entity while the message is in +transit. - const char *(*account_name)(void *opdata, const char *account, - const char *protocol); - void (*account_name_free)(void *opdata, const char *account_name); +2.5. SMP, Error, and Message Event Callbacks -Normally, if an error message needs to be sent from Alice to Bob, -containing Alice's account name, the value of ConnContext->accountname -will be used. However, if this default name is unsuitable for your -application, you can use the above methods to provide replacement values -for displayed account names. +To avoid hard-coded English phrases in libotr, operations which used to +pass back strings are replaced by operations that pass back event codes. -account_name is called when libotr requires a human-readable version of -an account name. account_name_free is called once the name has -been used, and the memory allocated by account_name (if any) must be -released. +2.6. Fragmentation Changes -Setting account_name to NULL will cause libotr to use -ConnContext->accountname as the displayed name for an account. +In libotr version 3.2.0, you would need to call otrl_message_sending() +to create an encrypted message, and then call fragment_and_send() to get +libotr to fragment and inject that message. In libotr 4.0.0, the +functionality of fragment_and_send() has been integrated into +otrl_message_sending(). -3.2. Using Fragmentation [Added in 3.1.0] +3. Required Changes -To make use of fragmentation, first make sure that the max_message_size -callback described in 3.1.1. has been implemented. Then, whenever you -would normally send a message through your IM client, call -otrl_message_fragment_and_send instead: +3.1. OtrlMessageAppOps Callbacks -gcry_error_t otrl_message_fragment_and_send(const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context, const char *message, - OtrlFragmentPolicy fragPolicy, char **returnFragment); +3.1.1. Removed Operations -Here, message is the original, encrypted, unfragmented message. -This method will break the message into fragments and send either all of -them or almost all of them according to the OtrlFragmentPolicy: - -OTRL_FRAGMENT_SEND_ALL sends all fragments at once -OTRL_FRAGMENT_SEND_ALL_BUT_FIRST sends all but the first fragment -OTRL_FRAGMENT_SEND_ALL_BUT_LAST sends all but the last fragment - -You may wish to use one of the latter two options if you still wish to -pass a message through your IM client. In this case, the unsent -fragment will be returned in returnFragment and should be sent as a -regular message. In order to reassemble the fragments, however, they -must be received in order, so at most one of the latter two options -will result in readable messages. - -3.3. Using SMP [Added in 3.1.0, revised in 3.2.0] - -Recall from section 2.2. above that SMP takes one input string from each -user and outputs either failure or success. - -3.3.1. Initiating - -If you wish to initiate SMP for a user named Alice, you would use -otrl_message_initiate_smp. - -void otrl_message_initiate_smp(OtrlUserState us, const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context, const unsigned char *secret, - size_t secretlen); - -Here, secret and secretlen describe the secret text as entered by Alice, -for example, ("kitten", 6). The other parameters are common to many -otrl_message functions. This method will cause a message to be sent -containing an appropriate OTRL_TLV_SMP1 (see below). - -3.3.2. Responding - -If you wish to continue SMP by supplying the secret for a second user -named Bob, you would use otrl_message_respond_smp: - -void otrl_message_respond_smp(OtrlUserState us, const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context, const unsigned char *secret, - size_t secretlen); - -The arguments for this method are the same as otrl_message_initiate_smp. -This method will send a message with an appropriate OTRL_TLV_SMP2 -(see below). - -3.3.3. Aborting - -If you wish to abort SMP for any reason, including errors occuring -during the protocol, you should use otrl_message_abort_smp: - -void otrl_message_abort_smp(OtrlUserState us, const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context); - -This method will cause the other user to abandon the current state of -SMP by sending an appropriate OTRL_TLV_SMP_ABORT (see below). - -3.3.4. Control Flow and Errors - -The protocol itself consists of 4 messages passed between the two users, -say Alice and Bob. These messages are identified through their TLVs: - -OTRL_TLV_SMP1 The initial message, containing a commitment to - Alice's secret -OTRL_TLV_SMP1Q Like OTRL_TLV_SMP1, but also containing a question - to display to Bob -OTRL_TLV_SMP2 A response containing a commitment to Bob's secret -OTRL_TLV_SMP3 The next message in the chain, from Alice to Bob -OTRL_TLV_SMP4 The final message in the chain, from Bob to Alice -OTRL_TLV_SMP_ABORT Indicates an error has occurred. Will reset SMP state - -To determine whether the protocol is proceeding correctly, additional -information has been added to ConnContext. You may access -context->smstate->nextExpected to find out which TLV should come next, -so you can compare this to what was actually received and take an -appropriate action. The value is of type NextExpectedSMP and could be -any of: - -OTRL_SMP_EXPECT1 Next SMP TLV should be OTRL_TLV_SMP1 -OTRL_SMP_EXPECT2 Next SMP TLV should be OTRL_TLV_SMP2 -OTRL_SMP_EXPECT3 Next SMP TLV should be OTRL_TLV_SMP3 -OTRL_SMP_EXPECT4 Next SMP TLV should be OTRL_TLV_SMP4 - -If at any point, an SMP TLV of an unexpected type is received, the -protocol should abort. Also, if the correct TLV type is received, then -the state should be updated accordingly. A typical control flow looks -like this: - - OtrlTLV *tlvs = NULL; - OtrlTLV *tlv = NULL; - [Initialize tlvs to the list of tlvs. This can be done - as part of otrl_message_receiving.] - - ConnContext *context = [correct context]; - NextExpectedSMP nextMsg = context->smstate->nextExpected; - - if (context->smstate->sm_prog_state == OTRL_SMP_PROG_CHEATED) { - otrg_plugin_abort_smp(context); - otrg_dialog_update_smp(context, 0.0); - context->smstate->nextExpected = OTRL_SMP_EXPECT1; - context->smstate->sm_prog_state = OTRL_SMP_PROG_OK; - } else { - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1Q); - if (tlv) { - if (nextMsg != OTRL_SMP_EXPECT1) - [abort SMP]; - else { - char *question = (char *)tlv->data; - char *eoq = memchr(question, '\0', tlv->len); - if (eoq) { - [prompt the user with question, get the response, - and continue SMP]; - } - } - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1); - if (tlv) { - if (nextMsg != OTRL_SMP_EXPECT1) - [abort SMP]; - else { - [get secret from user and continue SMP]; - } - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP2); - if (tlv) { - if (nextMsg != OTRL_SMP_EXPECT2) - [abort SMP]; - else { - // If we received TLV2, we will send TLV3 and expect TLV4 - context->smstate->nextExpected = OTRL_SMP_EXPECT4; - } - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP3); - if (tlv) { - if (nextMsg != OTRL_SMP_EXPECT3) - [abort SMP]; - else { - // If we received TLV3, we will send TLV4 - // We will not expect more messages, so prepare for next SMP - context->smstate->nextExpected = OTRL_SMP_EXPECT1; - // Report result to user - } - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP4); - if (tlv) { - if (nextMsg != OTRL_SMP_EXPECT4) - [abort SMP]; - else { - // We will not expect more messages, so prepare for next SMP - context->smstate->nextExpected = OTRL_SMP_EXPECT1; - // Report result to user - } - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP_ABORT); - if (tlv) { - // The message we are waiting for will not arrive, so reset - // and prepare for the next SMP - context->smstate->nextExpected = OTRL_SMP_EXPECT1; - } +/* Display a notification message for a particular accountname / + * protocol / username conversation. */ +void (*notify)(void *opdata, OtrlNotifyLevel level, + const char *accountname, const char *protocol, + const char *username, const char *title, + const char *primary, const char *secondary); + +The notify() operation was removed since it was used to pass in +hardcoded English strings. This has been replaced by error and message +event callbacks, described below, which pass event codes rather than +hardcoded strings. + + +/* Display an OTR control message for a particular accountname / + * protocol / username conversation. Return 0 if you are able to + * successfully display it. If you return non-0 (or if this + * function is NULL), the control message will be displayed inline, + * as a received message, or else by using the above notify() + * callback. */ +int (*display_otr_message)(void *opdata, const char *accountname, + const char *protocol, const char *username, const char *msg); + +The display_otr_message() operation was removed for the same reasons as +above for the notify() operation. + + +/* Return a newly allocated string containing a human-friendly name + * for the given protocol id */ +const char *(*protocol_name)(void *opdata, const char *protocol); + +/* Deallocate a string allocated by protocol_name */ +void (*protocol_name_free)(void *opdata, const char *protocol_name); + +The above operations are no longer required, as they were used when +preparing messages shown to users. + + +/* Log a message. The passed message will end in "\n". */ +void (*log_message)(void *opdata, const char *message); + +The log_message() operation was also replaced by message event +callbacks. + +3.1.2. Added Operations + +/* We received a request from the buddy to use the current "extra" + * symmetric key. The key will be passed in symkey, of length + * OTRL_EXTRAKEY_BYTES. The requested use, as well as use-specific + * data will be passed so that the applications can communicate other + * information (some id for the data transfer, for example). */ +void (*received_symkey)(void *opdata, ConnContext *context, + unsigned int use, const unsigned char *usedata, + size_t usedatalen, const unsigned char *symkey); + +This is called when a remote buddy has specified a use for the current +symmetric key. If your application does not use the extra symmetric key +it does not need to provide an implementation for this operation. + + +/* Return a string according to the error event. This string will then + * be concatenated to an OTR header to produce an OTR protocol error + * message. The following are the possible error events: + * - OTRL_ERRCODE_ENCRYPTION_ERROR + * occured while encrypting a message + * - OTRL_ERRCODE_MSG_NOT_IN_PRIVATE + * sent encrypted message to somebody who is not in + * a mutual OTR session + * - OTRL_ERRCODE_MSG_UNREADABLE + * sent an unreadable encrypted message + * - OTRL_ERRCODE_MSG_MALFORMED + * message sent is malformed */ +const char *(*otr_error_message)(void *opdata, ConnContext *context, + OtrlErrorCode err_code); + +/* Deallocate a string returned by otr_error_message */ +void (*otr_error_message_free)(void *opdata, const char *err_msg); + +These methods are for producing human-readable error message that will +be sent to the remote buddy when one of these error conditions occurs. +They will be appended to the string "?OTR Error: ". Implementing this +operation is not required, but depending on your application it may be a +good idea. + + +/* Return a string that will be prefixed to any resent message. If this + * function is not provided by the application then the default prefix, + * "[resent]", will be used. + * */ +const char *(*resent_msg_prefix)(void *opdata, ConnContext *context); + +/* Deallocate a string returned by resent_msg_prefix */ +void (*resent_msg_prefix_free)(void *opdata, const char *prefix); + +These operations give the option of chosing an alternative to the +English string "[resent]", when a message is resent. + + +/* Update the authentication UI with respect to SMP events + * These are the possible events: + * - OTRL_SMPEVENT_ASK_FOR_SECRET + * prompt the user to enter a shared secret. The sender application + * should call otrl_message_initiate_smp, passing NULL as the question. + * When the receiver application resumes the SM protocol by calling + * otrl_message_respond_smp with the secret answer. + * - OTRL_SMPEVENT_ASK_FOR_ANSWER + * (same as OTRL_SMPEVENT_ASK_FOR_SECRET but sender calls + * otrl_message_initiate_smp_q instead) + * - OTRL_SMPEVENT_CHEATED + * abort the current auth and update the auth progress dialog + * with progress_percent. otrl_message_abort_smp should be called to + * stop the SM protocol. + * - OTRL_SMPEVENT_INPROGRESS and + * OTRL_SMPEVENT_SUCCESS and + * OTRL_SMPEVENT_FAILURE and + * OTRL_SMPEVENT_ABORT + * update the auth progress dialog with progress_percent + * - OTRL_SMPEVENT_ERROR + * (same as OTRL_SMPEVENT_CHEATED) + * */ +void (*handle_smp_event)(void *opdata, OtrlSMPEvent smp_event, + ConnContext *context, unsigned short progress_percent, + char *question); + +These SMP events are initiated by otrl_message_receiving() when it has +received an SMP TLV from a remote buddy. If you application is +implementing support for SMP authentication it should handle these +events appropriately. + +Previously applications had to manually check, upon receiving messages, +whether the message contained any SMP TLVs that are relevant to the +current SMP state. + +/* Handle and send the appropriate message(s) to the sender/recipient + * depending on the message events. All the events only require an opdata, + * the event, and the context. The message and err will be NULL except for + * some events (see below). The possible events are: + * - OTRL_MSGEVENT_ENCRYPTION_REQUIRED + * Our policy requires encryption but we are trying to send + * an unencrypted message out. + * - OTRL_MSGEVENT_ENCRYPTION_ERROR + * An error occured while encrypting a message and the message + * was not sent. + * - OTRL_MSGEVENT_CONNECTION_ENDED + * Message has not been sent because our buddy has ended the + * private conversation. We should either close the connection, + * or refresh it. + * - OTRL_MSGEVENT_SETUP_ERROR + * A private conversation could not be set up. A gcry_error_t + * will be passed. + * - OTRL_MSGEVENT_MSG_REFLECTED + * Received our own OTR messages. + * - OTRL_MSGEVENT_MSG_RESENT + * The previous message was resent. + * - OTRL_MSGEVENT_RCVDMSG_NOT_IN_PRIVATE + * Received an encrypted message but cannot read + * it because no private connection is established yet. + * - OTRL_MSGEVENT_RCVDMSG_UNREADABLE + * Cannot read the received message. + * - OTRL_MSGEVENT_RCVDMSG_MALFORMED + * The message received contains malformed data. + * - OTRL_MSGEVENT_LOG_HEARTBEAT_RCVD + * Received a heartbeat. + * - OTRL_MSGEVENT_LOG_HEARTBEAT_SENT + * Sent a heartbeat. + * - OTRL_MSGEVENT_RCVDMSG_GENERAL_ERR + * Received a general OTR error. The argument 'message' will + * also be passed and it will contain the OTR error message. + * - OTRL_MSGEVENT_RCVDMSG_UNENCRYPTED + * Received an unencrypted message. The argument 'smessage' will + * also be passed and it will contain the plaintext message. + * - OTRL_MSGEVENT_RCVDMSG_UNRECOGNIZED + * Cannot recognize the type of OTR message received. + * - OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE + * Received and discarded a message intended for another instance. */ +void (*handle_msg_event)(void *opdata, OtrlMessageEvent msg_event, + ConnContext *context, const char *message, + gcry_error_t err); + +This operation is called when some type of exceptional event has occured +that your application may want to be aware of. Your application may want +to write an event to a log file, display a message to the user, or +ignore the event. While it is not required to implement this operation, +it is probably a good idea. + + +/* Create a instance tag for the given accountname/protocol if + * desired. */ +void (*create_instag)(void *opdata, const char *accountname, + const char *protocol); + +This is called when the library notices this account name and protocol +pair does not have an instance tag. Similar to create_privkey(), your +application may simply open a file handle and call: +gcry_error_t otrl_instag_generate_FILEp(OtrlUserState us, FILE *instf, + const char *accountname, const char *protocol) + +If you don't provide an implementation for this operation, a new +non-persistent instance tag will be randomly generated. One benefit to +having a persisted instance tag is that if your application closes and +re-opens during a private conversation, further messages you receive +from this buddy will correctly raise the +OTRL_MSGEVENT_RCVDMSG_UNREADABLE event instead of raising +OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE because destination instance +tag is now different from your own. + + +/* Called immediately before a data message is encrypted, and after a data + * message is decrypted. The OtrlConvertType parameter has the value + * OTRL_CONVERT_SENDING or OTRL_CONVERT_RECEIVING to differentiate these + * cases. */ +void (*convert_msg)(void *opdata, ConnContext *context, + OtrlConvertType convert_type, char ** dest, const char *src); + +/* Deallocate a string returned by convert_msg. */ +void (*convert_free)(void *opdata, ConnContext *context, char *dest); + +The convert_msg() operation is called immediately before a message is +encrypted and immediately after a message is decrypted. This callback +can tweak the plaintext message as needed. One use case would be for an +application to tweak formatting on the plaintext if, for example, this +is something that would normally be done on the plaintext by some other +entity while the message is in transit. + +/* When timer_control is called, turn off any existing periodic + * timer. + * + * Additionally, if interval > 0, set a new periodic timer + * to go off every interval seconds. When that timer fires, you + * must call otrl_message_poll(userstate, uiops, uiopdata); from the + * main libotr thread. + * + * The timing does not have to be exact; this timer is used to + * provide forward secrecy by cleaning up stale private state that + * may otherwise stick around in memory. Note that the + * timer_control callback may be invoked from otrl_message_poll + * itself, possibly to indicate that interval == 0 (that is, that + * there's no more periodic work to be done at this time). + * + * If you set this callback to NULL, then you must ensure that your + * application calls otrl_message_poll(userstate, uiops, uiopdata); + * from the main libotr thread every definterval seconds (where + * definterval can be obtained by calling + * definterval = otrl_message_poll_get_default_interval(userstate); + * right after creating the userstate). The advantage of + * implementing the timer_control callback is that the timer can be + * turned on by libotr only when it's needed. + * + * It is not a problem (except for a minor performance hit) to call + * otrl_message_poll more often than requested, whether + * timer_control is implemented or not. + * + * If you fail to implement the timer_control callback, and also + * fail to periodically call otrl_message_poll, then you open your + * users to a possible forward secrecy violation: an attacker that + * compromises the user's computer may be able to decrypt a handful + * of long-past messages (the first messages of an OTR + * conversation). + */ +void (*timer_control)(void *opdata, unsigned int interval); + +In order to prevent a forward secrecy violation, applications using +libotr now need to be able to call otrl_message_poll on occasion. The +simplest thing to do is just to set up a local timer that calls that +function every definterval = +otrl_message_poll_get_default_interval(userstate) seconds. To avoid +unnecessary overhead, however, the timer_control callback is available. +If you set timer_control to non-NULL, it will be called with +instructions to turn on or off the periodic timer, and to what interval. + +You must also be sure to turn off the timer before freeing your +userstate with otrl_userstate_free. + +3.2. Instance Tags + +If your application allows the same user to be logged in multiple times +from different locations, it should probably be aware of instance tags. +A user can maintain multiple concurrent OTR conversations with a buddy +who is logged in multiple times. Only one of the buddy's sessions can be +a client who is running OTR protocol version 2. When a user has a +conversation with a buddy who is running OTR protocol version 2, the +conversation is associated with a ConnContext that lists +"their_instance" as OTRL_INSTAG_MASTER (which has a value of 0). Each +version 3 conversation with the same buddy will have its own +ConnContext, which you can differentiate by the value in the +"their_instance" field. + +In the linked list of ConnContexts, the master context for a buddy is +always listed immediately before its children. Fingerprints are only +stored with the master context. Given a ConnContext associated to a +conversation with a buddy, you can easily iterate over all the contexts +for that buddy by doing the following: + +void example_something_happened(ConnContext * context) { + ConnContext * context_iter = context->m_context; + + while (context_iter && context_iter->m_context == context->m_context) { + /* Something you wish to affect all contexts of a particular buddy */ + context_iter = context_iter->next; } -To report the result to the user after receiving OTRL_TLV_SMP3 or -OTRL_TLV_SMP4, check whether context->active_fingerprint->trust is a -non-empty string. (That is, check that it's not NULL, and that its -first character is not '\0'.) If that is the case, then the SMP -completed successfully. Otherwise, the parties entered different secrets. - -3.4 Miscellaneous - -b64.h underwent a minor change in OTR 3.1.0. It was purely a -housekeeping change and should not require any changes to dependent code. - -The arguments to otrl_base64_encode and otrl_base64_decode did not agree -in terms of which were of type char* and which were unsigned char* -instead. This has been corrected. The new method signatures are: - -size_t otrl_base64_encode(char *base64data, const unsigned char *data, - size_t datalen); -size_t otrl_base64_decode(unsigned char *data, const char *base64data, - size_t base64len); +If a user has multiple OTR sessions with the same buddy, your +application will likely want to provide some way for the user to select +which instance to send outgoing messages to. You can detect when a user +has multiple OTR sessions with the same buddy by iterating over the +ConnContexts of a buddy when a conversation has gone secure and checking +whether more than one is not in plaintext state. You specify which +instance outgoing messages are directed to in otrl_message_sending: + +gcry_error_t otrl_message_sending(OtrlUserState us, + const OtrlMessageAppOps *ops, + void *opdata, const char *accountname, const char *protocol, + const char *recipient, otrl_instag_t instag, const char *original_msg, + OtrlTLV *tlvs, char **messagep, OtrlFragmentPolicy fragPolicy, + ConnContext **contextp, + void (*add_appdata)(void *data, ConnContext *context), + void *data); + +Instead of an actual instance tag, you can specify a meta instance tag +(e.g., if the user has not made an explicit selection). Here are the +list of meta instance tags, as defined in instag.h: + +#define OTRL_INSTAG_BEST 1 /* Most secure, based on: conv status, + * then fingerprint status, then most recent. */ +#define OTRL_INSTAG_RECENT 2 /* Most recent of the two meta instances below */ +#define OTRL_INSTAG_RECENT_RECEIVED 3 +#define OTRL_INSTAG_RECENT_SENT 4 + +OTRL_INSTAG_BEST choses the instance that has the best conv status, then +fingerprint status (in the event of a tie), then most recent (similarly +in the event of a tie). When calculating how recent an instance has been +active, OTRL_INSTAG_BEST is limited by a one second resolution. +OTRL_INSTAG_RECENT* does not have this limitation, but due to inherent +uncertainty in some networks, libotr's notion of the most recent may not +always agree with the remote network. It is important to understand +this limitation due to the issue noted in the next paragraph. + +Note that instances do add some uncertainty when dealing with networks +that only deliver messages to the most recently active session for a +buddy who is logged in multiple times. If you have a particular instance +selected, and the IM network is simply not going to deliver to that +particular instance, there isn't too much libotr can do. In this case, +you may want your application to warn when a user has selected an +instance that is not the most recent. + +To explicitly specify the destination instance of a protocol version 2 +conversation with a particular buddy, the instag value is +OTRL_INSTAG_MASTER. + +To look up a ConnContext associated with a particular instance (or meta- +instance), specify the instance in otrl_context_find(): + +ConnContext * otrl_context_find(OtrlUserState us, const char *user, + const char *accountname, const char *protocol, + otrl_instag_t their_instance, int add_if_missing, int *addedp, + void (*add_app_data)(void *data, ConnContext *context), void *data) + +If your application persists instance tags, when it starts up, it should +call one the following functions to read the persisted instance tags: + +gcry_error_t otrl_instag_read(OtrlUserState us, const char *filename); +gcry_error_t otrl_instag_read_FILEp(OtrlUserState us, FILE *instf); + +It would make sense to do this immediately after your application has +read stored privkeys and fingerprints. + +3.3. Fragmentation Changes + +In libotr version 3.2.0, you would need to call otrl_message_sending() +to create an encrypted message, and then call fragment_and_send() to +get libotr to fragment and inject that message. In libotr 4.0.0, the +functionality of fragment_and_send() has been integrated into +otrl_message_sending(). Simply specify an OtrlFragmentPolicy to +otrl_message_sending(). The fragmentation policies are the same as +before, and an addition policy "OTRL_FRAGMENT_SEND_SKIP" has been added +for cases when fragmentation is not desired. + +3.4. Asynchronous Private Key Generation + +An application that wants to begin asynchronous key generation calls the +following method: + +/* Begin a private key generation that will potentially take place in + * a background thread. This routine must be called from the main + * thread. It will set *newkeyp, which you can pass to + * otrl_privkey_generate_calculate in a background thread. If it + * returns gcry_error(GPG_ERR_EEXIST), then a privkey creation for + * this accountname/protocol is already in progress, and *newkeyp will + * be set to NULL. */ +gcry_error_t otrl_privkey_generate_start(OtrlUserState us, + const char *accountname, const char *protocol, void **newkeyp) + +A background thread can call the following method with the structure +that was passed into "newkeyp" above: + +/* Do the private key generation calculation. You may call this from a + * background thread. When it completes, call + * otrl_privkey_generate_finish from the _main_ thread. */ +gcry_error_t otrl_privkey_generate_calculate(void *newkey) + + +Upon completion the application would call: + +/* Call this from the main thread only. It will write the newly created + * private key into the given file and store it in the OtrlUserState. */ +gcry_error_t otrl_privkey_generate_finish(OtrlUserState us, + void *newkey, const char *filename) + +If the privkey generation was cancelled, the application should call: + +/* Call this from the main thread only, in the event that the background + * thread generating the key is cancelled. The newkey is deallocated, + * and must not be used further. */ +void otrl_privkey_generate_cancelled(OtrlUserState us, void *newkey) + + +3.5. Library Initialization + +If you currently initialize libotr with the recommended OTRL_INIT; +macro, you do not need to change anything. + +If you call otrl_init(ver_major, ver_minor, ver_sub) directly, then know +that this function no longer returns void. Previously, if the +application requested version numbers incompatible with those of the +library, the library would exit(1). Now, the otrl_init call will return +a non-zero error code. You must check the return value of otrl_init (a +gcry_error_t), and if it is non-zero, your application's expected +API/ABI does not match the installed libotr, and libotr cannot be used. diff --git a/plugins/MirOTR/libotr/read/aclocal.m4 b/plugins/MirOTR/libotr/read/aclocal.m4 deleted file mode 100644 index c7599c092c..0000000000 --- a/plugins/MirOTR/libotr/read/aclocal.m4 +++ /dev/null @@ -1,7376 +0,0 @@ -# generated automatically by aclocal 1.9.6 -*- Autoconf -*- - -# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, -# 2005 Free Software Foundation, Inc. -# This file is free software; the Free Software Foundation -# gives unlimited permission to copy and/or distribute it, -# with or without modifications, as long as this notice is preserved. - -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY, to the extent permitted by law; without -# even the implied warranty of MERCHANTABILITY or FITNESS FOR A -# PARTICULAR PURPOSE. - -dnl Autoconf macros for libgcrypt -dnl Copyright (C) 2002, 2004 Free Software Foundation, Inc. -dnl -dnl This file is free software; as a special exception the author gives -dnl unlimited permission to copy and/or distribute it, with or without -dnl modifications, as long as this notice is preserved. -dnl -dnl This file is distributed in the hope that it will be useful, but -dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the -dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - - -dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION, -dnl [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]]) -dnl Test for libgcrypt and define LIBGCRYPT_CFLAGS and LIBGCRYPT_LIBS. -dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed -dnl with the API version to also check the API compatibility. 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then - echo rs6000-ibm-aix3.2.4 - else - echo rs6000-ibm-aix3.2 - fi - exit ;; - *:AIX:*:[45]) - IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'` - if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then - IBM_ARCH=rs6000 - else - IBM_ARCH=powerpc - fi - if [ -x /usr/bin/oslevel ] ; then - IBM_REV=`/usr/bin/oslevel` - else - IBM_REV=${UNAME_VERSION}.${UNAME_RELEASE} - fi - echo ${IBM_ARCH}-ibm-aix${IBM_REV} - exit ;; - *:AIX:*:*) - echo rs6000-ibm-aix - exit ;; - ibmrt:4.4BSD:*|romp-ibm:BSD:*) - echo romp-ibm-bsd4.4 - exit ;; - ibmrt:*BSD:*|romp-ibm:BSD:*) # covers RT/PC BSD and - echo romp-ibm-bsd${UNAME_RELEASE} # 4.3 with uname added to - exit ;; # report: romp-ibm BSD 4.3 - *:BOSX:*:*) - echo rs6000-bull-bosx - exit ;; - DPX/2?00:B.O.S.:*:*) - echo m68k-bull-sysv3 - exit ;; - 9000/[34]??:4.3bsd:1.*:*) - echo m68k-hp-bsd - exit ;; - hp300:4.4BSD:*:* | 9000/[34]??:4.3bsd:2.*:*) - echo m68k-hp-bsd4.4 - exit ;; - 9000/[34678]??:HP-UX:*:*) - HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'` - case "${UNAME_MACHINE}" in - 9000/31? ) HP_ARCH=m68000 ;; - 9000/[34]?? ) HP_ARCH=m68k ;; - 9000/[678][0-9][0-9]) - if [ -x /usr/bin/getconf ]; then - sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null` - sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null` - case "${sc_cpu_version}" in - 523) HP_ARCH="hppa1.0" ;; # CPU_PA_RISC1_0 - 528) HP_ARCH="hppa1.1" ;; # CPU_PA_RISC1_1 - 532) # CPU_PA_RISC2_0 - case "${sc_kernel_bits}" in - 32) HP_ARCH="hppa2.0n" ;; - 64) HP_ARCH="hppa2.0w" ;; - '') HP_ARCH="hppa2.0" ;; # HP-UX 10.20 - esac ;; - esac - fi - if [ "${HP_ARCH}" = "" ]; then - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - - #define _HPUX_SOURCE - #include <stdlib.h> - #include <unistd.h> - - int main () - { - #if defined(_SC_KERNEL_BITS) - long bits = sysconf(_SC_KERNEL_BITS); - #endif - long cpu = sysconf (_SC_CPU_VERSION); - - switch (cpu) - { - case CPU_PA_RISC1_0: puts ("hppa1.0"); break; - case CPU_PA_RISC1_1: puts ("hppa1.1"); break; - case CPU_PA_RISC2_0: - #if defined(_SC_KERNEL_BITS) - switch (bits) - { - case 64: puts ("hppa2.0w"); break; - case 32: puts ("hppa2.0n"); break; - default: puts ("hppa2.0"); break; - } break; - #else /* !defined(_SC_KERNEL_BITS) */ - puts ("hppa2.0"); break; - #endif - default: puts ("hppa1.0"); break; - } - exit (0); - } -EOF - (CCOPTS= $CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null) && HP_ARCH=`$dummy` - test -z "$HP_ARCH" && HP_ARCH=hppa - fi ;; - esac - if [ ${HP_ARCH} = "hppa2.0w" ] - then - eval $set_cc_for_build - - # hppa2.0w-hp-hpux* has a 64-bit kernel and a compiler generating - # 32-bit code. hppa64-hp-hpux* has the same kernel and a compiler - # generating 64-bit code. GNU and HP use different nomenclature: - # - # $ CC_FOR_BUILD=cc ./config.guess - # => hppa2.0w-hp-hpux11.23 - # $ CC_FOR_BUILD="cc +DA2.0w" ./config.guess - # => hppa64-hp-hpux11.23 - - if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | - grep __LP64__ >/dev/null - then - HP_ARCH="hppa2.0w" - else - HP_ARCH="hppa64" - fi - fi - echo ${HP_ARCH}-hp-hpux${HPUX_REV} - exit ;; - ia64:HP-UX:*:*) - HPUX_REV=`echo ${UNAME_RELEASE}|sed -e 's/[^.]*.[0B]*//'` - echo ia64-hp-hpux${HPUX_REV} - exit ;; - 3050*:HI-UX:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #include <unistd.h> - int - main () - { - long cpu = sysconf (_SC_CPU_VERSION); - /* The order matters, because CPU_IS_HP_MC68K erroneously returns - true for CPU_PA_RISC1_0. CPU_IS_PA_RISC returns correct - results, however. */ - if (CPU_IS_PA_RISC (cpu)) - { - switch (cpu) - { - case CPU_PA_RISC1_0: puts ("hppa1.0-hitachi-hiuxwe2"); break; - case CPU_PA_RISC1_1: puts ("hppa1.1-hitachi-hiuxwe2"); break; - case CPU_PA_RISC2_0: puts ("hppa2.0-hitachi-hiuxwe2"); break; - default: puts ("hppa-hitachi-hiuxwe2"); break; - } - } - else if (CPU_IS_HP_MC68K (cpu)) - puts ("m68k-hitachi-hiuxwe2"); - else puts ("unknown-hitachi-hiuxwe2"); - exit (0); - } -EOF - $CC_FOR_BUILD -o $dummy $dummy.c && SYSTEM_NAME=`$dummy` && - { echo "$SYSTEM_NAME"; exit; } - echo unknown-hitachi-hiuxwe2 - exit ;; - 9000/7??:4.3bsd:*:* | 9000/8?[79]:4.3bsd:*:* ) - echo hppa1.1-hp-bsd - exit ;; - 9000/8??:4.3bsd:*:*) - echo hppa1.0-hp-bsd - exit ;; - *9??*:MPE/iX:*:* | *3000*:MPE/iX:*:*) - echo hppa1.0-hp-mpeix - exit ;; - hp7??:OSF1:*:* | hp8?[79]:OSF1:*:* ) - echo hppa1.1-hp-osf - exit ;; - hp8??:OSF1:*:*) - echo hppa1.0-hp-osf - exit ;; - i*86:OSF1:*:*) - if [ -x /usr/sbin/sysversion ] ; then - echo ${UNAME_MACHINE}-unknown-osf1mk - else - echo ${UNAME_MACHINE}-unknown-osf1 - fi - exit ;; - parisc*:Lites*:*:*) - echo hppa1.1-hp-lites - exit ;; - C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*) - echo c1-convex-bsd - exit ;; - C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*) - if getsysinfo -f scalar_acc - then echo c32-convex-bsd - else echo c2-convex-bsd - fi - exit ;; - C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*) - echo c34-convex-bsd - exit ;; - C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*) - echo c38-convex-bsd - exit ;; - C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*) - echo c4-convex-bsd - exit ;; - CRAY*Y-MP:*:*:*) - echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*[A-Z]90:*:*:*) - echo ${UNAME_MACHINE}-cray-unicos${UNAME_RELEASE} \ - | sed -e 's/CRAY.*\([A-Z]90\)/\1/' \ - -e y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/ \ - -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*TS:*:*:*) - echo t90-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*T3E:*:*:*) - echo alphaev5-cray-unicosmk${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - CRAY*SV1:*:*:*) - echo sv1-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - *:UNICOS/mp:*:*) - echo craynv-cray-unicosmp${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/' - exit ;; - F30[01]:UNIX_System_V:*:* | F700:UNIX_System_V:*:*) - FUJITSU_PROC=`uname -m | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'` - FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'` - FUJITSU_REL=`echo ${UNAME_RELEASE} | sed -e 's/ /_/'` - echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}" - exit ;; - 5000:UNIX_System_V:4.*:*) - FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'` - FUJITSU_REL=`echo ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'` - echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}" - exit ;; - i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*) - echo ${UNAME_MACHINE}-pc-bsdi${UNAME_RELEASE} - exit ;; - sparc*:BSD/OS:*:*) - echo sparc-unknown-bsdi${UNAME_RELEASE} - exit ;; - *:BSD/OS:*:*) - echo ${UNAME_MACHINE}-unknown-bsdi${UNAME_RELEASE} - exit ;; - *:FreeBSD:*:*) - echo ${UNAME_MACHINE}-unknown-freebsd`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'` - exit ;; - i*:CYGWIN*:*) - echo ${UNAME_MACHINE}-pc-cygwin - exit ;; - i*:MINGW*:*) - echo ${UNAME_MACHINE}-pc-mingw32 - exit ;; - i*:windows32*:*) - # uname -m includes "-pc" on this system. - echo ${UNAME_MACHINE}-mingw32 - exit ;; - i*:PW*:*) - echo ${UNAME_MACHINE}-pc-pw32 - exit ;; - x86:Interix*:[34]*) - echo i586-pc-interix${UNAME_RELEASE}|sed -e 's/\..*//' - exit ;; - [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*) - echo i${UNAME_MACHINE}-pc-mks - exit ;; - i*:Windows_NT*:* | Pentium*:Windows_NT*:*) - # How do we know it's Interix rather than the generic POSIX subsystem? - # It also conflicts with pre-2.0 versions of AT&T UWIN. Should we - # UNAME_MACHINE based on the output of uname instead of i386? - echo i586-pc-interix - exit ;; - i*:UWIN*:*) - echo ${UNAME_MACHINE}-pc-uwin - exit ;; - amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*) - echo x86_64-unknown-cygwin - exit ;; - p*:CYGWIN*:*) - echo powerpcle-unknown-cygwin - exit ;; - prep*:SunOS:5.*:*) - echo powerpcle-unknown-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'` - exit ;; - *:GNU:*:*) - # the GNU system - echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'` - exit ;; - *:GNU/*:*:*) - # other systems with GNU libc and userland - echo ${UNAME_MACHINE}-unknown-`echo ${UNAME_SYSTEM} | sed 's,^[^/]*/,,' | tr '[A-Z]' '[a-z]'``echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-gnu - exit ;; - i*86:Minix:*:*) - echo ${UNAME_MACHINE}-pc-minix - exit ;; - arm*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - cris:Linux:*:*) - echo cris-axis-linux-gnu - exit ;; - crisv32:Linux:*:*) - echo crisv32-axis-linux-gnu - exit ;; - frv:Linux:*:*) - echo frv-unknown-linux-gnu - exit ;; - ia64:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - m32r*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - m68*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - mips:Linux:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #undef CPU - #undef mips - #undef mipsel - #if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL) - CPU=mipsel - #else - #if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB) - CPU=mips - #else - CPU= - #endif - #endif -EOF - eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=` - test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; } - ;; - mips64:Linux:*:*) - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #undef CPU - #undef mips64 - #undef mips64el - #if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL) - CPU=mips64el - #else - #if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB) - CPU=mips64 - #else - CPU= - #endif - #endif -EOF - eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=` - test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; } - ;; - or32:Linux:*:*) - echo or32-unknown-linux-gnu - exit ;; - ppc:Linux:*:*) - echo powerpc-unknown-linux-gnu - exit ;; - ppc64:Linux:*:*) - echo powerpc64-unknown-linux-gnu - exit ;; - alpha:Linux:*:*) - case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in - EV5) UNAME_MACHINE=alphaev5 ;; - EV56) UNAME_MACHINE=alphaev56 ;; - PCA56) UNAME_MACHINE=alphapca56 ;; - PCA57) UNAME_MACHINE=alphapca56 ;; - EV6) UNAME_MACHINE=alphaev6 ;; - EV67) UNAME_MACHINE=alphaev67 ;; - EV68*) UNAME_MACHINE=alphaev68 ;; - esac - objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null - if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi - echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC} - exit ;; - parisc:Linux:*:* | hppa:Linux:*:*) - # Look for CPU level - case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in - PA7*) echo hppa1.1-unknown-linux-gnu ;; - PA8*) echo hppa2.0-unknown-linux-gnu ;; - *) echo hppa-unknown-linux-gnu ;; - esac - exit ;; - parisc64:Linux:*:* | hppa64:Linux:*:*) - echo hppa64-unknown-linux-gnu - exit ;; - s390:Linux:*:* | s390x:Linux:*:*) - echo ${UNAME_MACHINE}-ibm-linux - exit ;; - sh64*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - sh*:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - sparc:Linux:*:* | sparc64:Linux:*:*) - echo ${UNAME_MACHINE}-unknown-linux-gnu - exit ;; - x86_64:Linux:*:*) - echo x86_64-unknown-linux-gnu - exit ;; - i*86:Linux:*:*) - # The BFD linker knows what the default object file format is, so - # first see if it will tell us. cd to the root directory to prevent - # problems with other programs or directories called `ld' in the path. - # Set LC_ALL=C to ensure ld outputs messages in English. - ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \ - | sed -ne '/supported targets:/!d - s/[ ][ ]*/ /g - s/.*supported targets: *// - s/ .*// - p'` - case "$ld_supported_targets" in - elf32-i386) - TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu" - ;; - a.out-i386-linux) - echo "${UNAME_MACHINE}-pc-linux-gnuaout" - exit ;; - coff-i386) - echo "${UNAME_MACHINE}-pc-linux-gnucoff" - exit ;; - "") - # Either a pre-BFD a.out linker (linux-gnuoldld) or - # one that does not give us useful --help. - echo "${UNAME_MACHINE}-pc-linux-gnuoldld" - exit ;; - esac - # Determine whether the default compiler is a.out or elf - eval $set_cc_for_build - sed 's/^ //' << EOF >$dummy.c - #include <features.h> - #ifdef __ELF__ - # ifdef __GLIBC__ - # if __GLIBC__ >= 2 - LIBC=gnu - # else - LIBC=gnulibc1 - # endif - # else - LIBC=gnulibc1 - # endif - #else - #ifdef __INTEL_COMPILER - LIBC=gnu - #else - LIBC=gnuaout - #endif - #endif - #ifdef __dietlibc__ - LIBC=dietlibc - #endif -EOF - eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^LIBC=` - test x"${LIBC}" != x && { - echo "${UNAME_MACHINE}-pc-linux-${LIBC}" - exit - } - test x"${TENTATIVE}" != x && { echo "${TENTATIVE}"; exit; } - ;; - i*86:DYNIX/ptx:4*:*) - # ptx 4.0 does uname -s correctly, with DYNIX/ptx in there. - # earlier versions are messed up and put the nodename in both - # sysname and nodename. - echo i386-sequent-sysv4 - exit ;; - i*86:UNIX_SV:4.2MP:2.*) - # Unixware is an offshoot of SVR4, but it has its own version - # number series starting with 2... - # I am not positive that other SVR4 systems won't match this, - # I just have to hope. -- rms. - # Use sysv4.2uw... so that sysv4* matches it. - echo ${UNAME_MACHINE}-pc-sysv4.2uw${UNAME_VERSION} - exit ;; - i*86:OS/2:*:*) - # If we were able to find `uname', then EMX Unix compatibility - # is probably installed. - echo ${UNAME_MACHINE}-pc-os2-emx - exit ;; - i*86:XTS-300:*:STOP) - echo ${UNAME_MACHINE}-unknown-stop - exit ;; - i*86:atheos:*:*) - echo ${UNAME_MACHINE}-unknown-atheos - exit ;; - i*86:syllable:*:*) - echo ${UNAME_MACHINE}-pc-syllable - exit ;; - i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.0*:*) - echo i386-unknown-lynxos${UNAME_RELEASE} - exit ;; - i*86:*DOS:*:*) - echo ${UNAME_MACHINE}-pc-msdosdjgpp - exit ;; - i*86:*:4.*:* | i*86:SYSTEM_V:4.*:*) - UNAME_REL=`echo ${UNAME_RELEASE} | sed 's/\/MP$//'` - if grep Novell /usr/include/link.h >/dev/null 2>/dev/null; then - echo ${UNAME_MACHINE}-univel-sysv${UNAME_REL} - else - echo ${UNAME_MACHINE}-pc-sysv${UNAME_REL} - fi - exit ;; - i*86:*:5:[678]*) - # UnixWare 7.x, OpenUNIX and OpenServer 6. - case `/bin/uname -X | grep "^Machine"` in - *486*) UNAME_MACHINE=i486 ;; - *Pentium) UNAME_MACHINE=i586 ;; - *Pent*|*Celeron) UNAME_MACHINE=i686 ;; - esac - echo ${UNAME_MACHINE}-unknown-sysv${UNAME_RELEASE}${UNAME_SYSTEM}${UNAME_VERSION} - exit ;; - i*86:*:3.2:*) - if test -f /usr/options/cb.name; then - UNAME_REL=`sed -n 's/.*Version //p' </usr/options/cb.name` - echo ${UNAME_MACHINE}-pc-isc$UNAME_REL - elif /bin/uname -X 2>/dev/null >/dev/null ; then - UNAME_REL=`(/bin/uname -X|grep Release|sed -e 's/.*= //')` - (/bin/uname -X|grep i80486 >/dev/null) && UNAME_MACHINE=i486 - (/bin/uname -X|grep '^Machine.*Pentium' >/dev/null) \ - && UNAME_MACHINE=i586 - (/bin/uname -X|grep '^Machine.*Pent *II' >/dev/null) \ - && UNAME_MACHINE=i686 - (/bin/uname -X|grep '^Machine.*Pentium Pro' >/dev/null) \ - && UNAME_MACHINE=i686 - echo ${UNAME_MACHINE}-pc-sco$UNAME_REL - else - echo ${UNAME_MACHINE}-pc-sysv32 - fi - exit ;; 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- PENTIUM:*:4.0*:*) # Unisys `ClearPath HMP IX 4000' SVR4/MP effort - # says <Richard.M.Bartel@ccMail.Census.GOV> - echo i586-unisys-sysv4 - exit ;; - *:UNIX_System_V:4*:FTX*) - # From Gerald Hewes <hewes@openmarket.com>. - # How about differentiating between stratus architectures? -djm - echo hppa1.1-stratus-sysv4 - exit ;; - *:*:*:FTX*) - # From seanf@swdc.stratus.com. - echo i860-stratus-sysv4 - exit ;; - i*86:VOS:*:*) - # From Paul.Green@stratus.com. - echo ${UNAME_MACHINE}-stratus-vos - exit ;; - *:VOS:*:*) - # From Paul.Green@stratus.com. - echo hppa1.1-stratus-vos - exit ;; - mc68*:A/UX:*:*) - echo m68k-apple-aux${UNAME_RELEASE} - exit ;; - news*:NEWS-OS:6*:*) - echo mips-sony-newsos6 - exit ;; - R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*) - if [ -d /usr/nec ]; then - echo mips-nec-sysv${UNAME_RELEASE} - else - echo mips-unknown-sysv${UNAME_RELEASE} - fi - exit ;; - BeBox:BeOS:*:*) # BeOS running on hardware made by Be, PPC only. - echo powerpc-be-beos - exit ;; 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Perhaps BFD should be changed, - I don't know.... */ - printf ("mips-sony-bsd\n"); exit (0); -#else -#include <sys/param.h> - printf ("m68k-sony-newsos%s\n", -#ifdef NEWSOS4 - "4" -#else - "" -#endif - ); exit (0); -#endif -#endif - -#if defined (__arm) && defined (__acorn) && defined (__unix) - printf ("arm-acorn-riscix\n"); exit (0); -#endif - -#if defined (hp300) && !defined (hpux) - printf ("m68k-hp-bsd\n"); exit (0); -#endif - -#if defined (NeXT) -#if !defined (__ARCHITECTURE__) -#define __ARCHITECTURE__ "m68k" -#endif - int version; - version=`(hostinfo | sed -n 's/.*NeXT Mach \([0-9]*\).*/\1/p') 2>/dev/null`; - if (version < 4) - printf ("%s-next-nextstep%d\n", __ARCHITECTURE__, version); - else - printf ("%s-next-openstep%d\n", __ARCHITECTURE__, version); - exit (0); -#endif - -#if defined (MULTIMAX) || defined (n16) -#if defined (UMAXV) - printf ("ns32k-encore-sysv\n"); exit (0); -#else -#if defined (CMU) - printf ("ns32k-encore-mach\n"); exit (0); -#else - printf ("ns32k-encore-bsd\n"); exit (0); -#endif -#endif -#endif - -#if defined (__386BSD__) - printf ("i386-pc-bsd\n"); exit (0); -#endif - -#if defined (sequent) -#if defined (i386) - printf ("i386-sequent-dynix\n"); exit (0); -#endif -#if defined (ns32000) - printf ("ns32k-sequent-dynix\n"); exit (0); -#endif -#endif - -#if defined (_SEQUENT_) - struct utsname un; - - uname(&un); - - if (strncmp(un.version, "V2", 2) == 0) { - printf ("i386-sequent-ptx2\n"); exit (0); - } - if (strncmp(un.version, "V1", 2) == 0) { /* XXX is V1 correct? */ - printf ("i386-sequent-ptx1\n"); exit (0); - } - printf ("i386-sequent-ptx\n"); exit (0); - -#endif - -#if defined (vax) -# if !defined (ultrix) -# include <sys/param.h> -# if defined (BSD) -# if BSD == 43 - printf ("vax-dec-bsd4.3\n"); exit (0); -# else -# if BSD == 199006 - printf ("vax-dec-bsd4.3reno\n"); exit (0); -# else - printf ("vax-dec-bsd\n"); exit (0); -# endif -# endif -# else - printf ("vax-dec-bsd\n"); exit (0); -# endif -# else - printf ("vax-dec-ultrix\n"); exit (0); -# endif -#endif - -#if defined (alliant) && defined (i860) - printf ("i860-alliant-bsd\n"); exit (0); -#endif - - exit (1); -} -EOF - -$CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null && SYSTEM_NAME=`$dummy` && - { echo "$SYSTEM_NAME"; exit; } - -# Apollos put the system type in the environment. - -test -d /usr/apollo && { echo ${ISP}-apollo-${SYSTYPE}; exit; } - -# Convex versions that predate uname can use getsysinfo(1) - -if [ -x /usr/convex/getsysinfo ] -then - case `getsysinfo -f cpu_type` in - c1*) - echo c1-convex-bsd - exit ;; - c2*) - if getsysinfo -f scalar_acc - then echo c32-convex-bsd - else echo c2-convex-bsd - fi - exit ;; - c34*) - echo c34-convex-bsd - exit ;; - c38*) - echo c38-convex-bsd - exit ;; - c4*) - echo c4-convex-bsd - exit ;; - esac -fi - -cat >&2 <<EOF -$0: unable to guess system type - -This script, last modified $timestamp, has failed to recognize -the operating system you are using. It is advised that you -download the most up to date version of the config scripts from - - http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.guess -and - http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.sub - -If the version you run ($0) is already up to date, please -send the following data and any information you think might be -pertinent to <config-patches@gnu.org> in order to provide the needed -information to handle your system. - -config.guess timestamp = $timestamp - -uname -m = `(uname -m) 2>/dev/null || echo unknown` -uname -r = `(uname -r) 2>/dev/null || echo unknown` -uname -s = `(uname -s) 2>/dev/null || echo unknown` -uname -v = `(uname -v) 2>/dev/null || echo unknown` - -/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null` -/bin/uname -X = `(/bin/uname -X) 2>/dev/null` - -hostinfo = `(hostinfo) 2>/dev/null` -/bin/universe = `(/bin/universe) 2>/dev/null` -/usr/bin/arch -k = `(/usr/bin/arch -k) 2>/dev/null` -/bin/arch = `(/bin/arch) 2>/dev/null` -/usr/bin/oslevel = `(/usr/bin/oslevel) 2>/dev/null` -/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null` - -UNAME_MACHINE = ${UNAME_MACHINE} -UNAME_RELEASE = ${UNAME_RELEASE} -UNAME_SYSTEM = ${UNAME_SYSTEM} -UNAME_VERSION = ${UNAME_VERSION} -EOF - -exit 1 - -# Local variables: -# eval: (add-hook 'write-file-hooks 'time-stamp) -# time-stamp-start: "timestamp='" -# time-stamp-format: "%:y-%02m-%02d" -# time-stamp-end: "'" -# End: diff --git a/plugins/MirOTR/libotr/read/config.h.in b/plugins/MirOTR/libotr/read/config.h.in deleted file mode 100644 index 09ee04cec2..0000000000 --- a/plugins/MirOTR/libotr/read/config.h.in +++ /dev/null @@ -1,55 +0,0 @@ -/* config.h.in. Generated from configure.ac by autoheader. */ - -/* Define to 1 if you have the <dlfcn.h> header file. */ -#undef HAVE_DLFCN_H - -/* Define to 1 if you have the <inttypes.h> header file. */ -#undef HAVE_INTTYPES_H - -/* Define to 1 if you have the <memory.h> header file. */ -#undef HAVE_MEMORY_H - -/* Define to 1 if you have the <stdint.h> header file. */ -#undef HAVE_STDINT_H - -/* Define to 1 if you have the <stdlib.h> header file. */ -#undef HAVE_STDLIB_H - -/* Define to 1 if you have the <strings.h> header file. */ -#undef HAVE_STRINGS_H - -/* Define to 1 if you have the <string.h> header file. */ -#undef HAVE_STRING_H - -/* Define to 1 if you have the <sys/stat.h> header file. */ -#undef HAVE_SYS_STAT_H - -/* Define to 1 if you have the <sys/types.h> header file. */ -#undef HAVE_SYS_TYPES_H - -/* Define to 1 if you have the <unistd.h> header file. */ -#undef HAVE_UNISTD_H - -/* Name of package */ -#undef PACKAGE - -/* Define to the address where bug reports for this package should be sent. */ -#undef PACKAGE_BUGREPORT - -/* Define to the full name of this package. */ -#undef PACKAGE_NAME - -/* Define to the full name and version of this package. */ -#undef PACKAGE_STRING - -/* Define to the one symbol short name of this package. */ -#undef PACKAGE_TARNAME - -/* Define to the version of this package. */ -#undef PACKAGE_VERSION - -/* Define to 1 if you have the ANSI C header files. */ -#undef STDC_HEADERS - -/* Version number of package */ -#undef VERSION diff --git a/plugins/MirOTR/libotr/read/config.sub b/plugins/MirOTR/libotr/read/config.sub deleted file mode 100644 index 1c366dfde9..0000000000 --- a/plugins/MirOTR/libotr/read/config.sub +++ /dev/null @@ -1,1579 +0,0 @@ -#! /bin/sh -# Configuration validation subroutine script. -# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, -# 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. - -timestamp='2005-07-08' - -# This file is (in principle) common to ALL GNU software. -# The presence of a machine in this file suggests that SOME GNU software -# can handle that machine. It does not imply ALL GNU software can. -# -# This file is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or -# (at your option) any later version. -# -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA -# 02110-1301, USA. -# -# As a special exception to the GNU General Public License, if you -# distribute this file as part of a program that contains a -# configuration script generated by Autoconf, you may include it under -# the same distribution terms that you use for the rest of that program. - - -# Please send patches to <config-patches@gnu.org>. 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See the GNU -dnl Lesser General Public License for more details. -dnl -dnl You should have received a copy of the GNU Lesser General Public -dnl License along with this library; if not, write to the Free Software -dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -dnl - -dnl AM_PATH_LIBOTR([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]]) -dnl Test for libotr, and define LIBOTR_CFLAGS and LIBOTR_LIBS as appropriate. -dnl enables arguments --with-libotr-prefix= -dnl --with-libotr-inc-prefix= -dnl -dnl You must already have found libgcrypt with AM_PATH_LIBGCRYPT -dnl -dnl Adapted from alsa.m4, originally by -dnl Richard Boulton <richard-alsa@tartarus.org> -dnl Christopher Lansdown <lansdoct@cs.alfred.edu> -dnl Jaroslav Kysela <perex@suse.cz> - -AC_DEFUN([AM_PATH_LIBOTR], -[dnl Save the original CFLAGS, LDFLAGS, and LIBS -libotr_save_CFLAGS="$CFLAGS" -libotr_save_LDFLAGS="$LDFLAGS" -libotr_save_LIBS="$LIBS" -libotr_found=yes - -dnl -dnl Get the cflags and libraries for libotr -dnl -AC_ARG_WITH(libotr-prefix, -[ --with-libotr-prefix=PFX Prefix where libotr is installed(optional)], -[libotr_prefix="$withval"], [libotr_prefix=""]) - -AC_ARG_WITH(libotr-inc-prefix, -[ --with-libotr-inc-prefix=PFX Prefix where libotr includes are (optional)], -[libotr_inc_prefix="$withval"], [libotr_inc_prefix=""]) - -dnl Add any special include directories -AC_MSG_CHECKING(for libotr CFLAGS) -if test "$libotr_inc_prefix" != "" ; then - LIBOTR_CFLAGS="$LIBOTR_CFLAGS -I$libotr_inc_prefix" - CFLAGS="$CFLAGS $LIBOTR_CFLAGS" -fi -AC_MSG_RESULT($LIBOTR_CFLAGS) - -dnl add any special lib dirs -AC_MSG_CHECKING(for libotr LIBS) -if test "$libotr_prefix" != "" ; then - LIBOTR_LIBS="$LIBOTR_LIBS -L$libotr_prefix" - LDFLAGS="$LDFLAGS $LIBOTR_LIBS" -fi - -dnl add the libotr library -LIBOTR_LIBS="$LIBOTR_LIBS -lotr" -LIBS="$LIBOTR_LIBS $LIBS" -AC_MSG_RESULT($LIBOTR_LIBS) - -dnl Check for a working version of libotr that is of the right version. -min_libotr_version=ifelse([$1], ,3.0.0,$1) -no_libotr="" - libotr_min_major_version=`echo $min_libotr_version | \ - sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'` - libotr_min_minor_version=`echo $min_libotr_version | \ - sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'` - libotr_min_sub_version=`echo $min_libotr_version | \ - sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'` -AC_MSG_CHECKING(for libotr headers version $libotr_min_major_version.x >= $min_libotr_version) - -AC_LANG_SAVE -AC_LANG_C -AC_TRY_COMPILE([ -#include <stdlib.h> -#include <libotr/version.h> -], [ -# if(OTRL_VERSION_MAJOR != $libotr_min_major_version) -# error not present -# else - -# if(OTRL_VERSION_MINOR > $libotr_min_minor_version) - exit(0); -# else -# if(OTRL_VERSION_MINOR < $libotr_min_minor_version) -# error not present -# endif - -# if(OTRL_VERSION_SUB < $libotr_min_sub_version) -# error not present -# endif -# endif -# endif -exit(0); -], - [AC_MSG_RESULT(found.)], - [AC_MSG_RESULT(not present.) - ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libotr not found.)]) - libotr_found=no] -) -AC_LANG_RESTORE - -dnl Now that we know that we have the right version, let's see if we have the library and not just the headers. -AC_CHECK_LIB([otr], [otrl_message_receiving],, - [ifelse([$3], , [AC_MSG_ERROR(No linkable libotr was found.)]) - libotr_found=no], - $LIBGCRYPT_LIBS -) - -LDFLAGS="$libotr_save_LDFLAGS" -LIBS="$libotr_save_LIBS" - -if test "x$libotr_found" = "xyes" ; then - ifelse([$2], , :, [$2]) -else - LIBOTR_CFLAGS="" - LIBOTR_LIBS="" - ifelse([$3], , :, [$3]) -fi - -dnl That should be it. 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Check the \`README' file, - it often tells you about the needed prerequisites for installing - this package. You may also peek at any GNU archive site, in case - some other package would contain this missing \`$1' program." - exit 1 - ;; -esac - -exit 0 - -# Local variables: -# eval: (add-hook 'write-file-hooks 'time-stamp) -# time-stamp-start: "scriptversion=" -# time-stamp-format: "%:y-%02m-%02d.%02H" -# time-stamp-end: "$" -# End: diff --git a/plugins/MirOTR/libotr/src/auth.c b/plugins/MirOTR/libotr/src/auth.c index 978c986613..d0c55057e1 100644 --- a/plugins/MirOTR/libotr/src/auth.c +++ b/plugins/MirOTR/libotr/src/auth.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -27,33 +29,73 @@ #include "privkey.h" #include "auth.h" #include "serial.h" +#include "proto.h" +#include "context.h" +#include "mem.h" + +#if OTRL_DEBUGGING +#include <stdio.h> + +/* Dump the contents of an OtrlAuthInfo to the FILE *f. */ +void otrl_auth_dump(FILE *f, const OtrlAuthInfo *auth) +{ + int i; + + fprintf(f, " Auth info %p:\n", auth); + fprintf(f, " State: %d (%s)\n", auth->authstate, + auth->authstate == OTRL_AUTHSTATE_NONE ? "NONE" : + auth->authstate == OTRL_AUTHSTATE_AWAITING_DHKEY ? "AWAITING_DHKEY" : + auth->authstate == OTRL_AUTHSTATE_AWAITING_REVEALSIG ? + "AWAITING_REVEALSIG" : + auth->authstate == OTRL_AUTHSTATE_AWAITING_SIG ? "AWAITING_SIG" : + auth->authstate == OTRL_AUTHSTATE_V1_SETUP ? "V1_SETUP" : + "INVALID"); + fprintf(f, " Context: %p\n", auth->context); + fprintf(f, " Our keyid: %u\n", auth->our_keyid); + fprintf(f, " Their keyid: %u\n", auth->their_keyid); + fprintf(f, " Their fingerprint: "); + for (i=0;i<20;++i) { + fprintf(f, "%02x", auth->their_fingerprint[i]); + } + fprintf(f, "\n Initiated = %d\n", auth->initiated); + fprintf(f, "\n Proto version = %d\n", auth->protocol_version); + fprintf(f, "\n Lastauthmsg = %s\n", + auth->lastauthmsg ? auth->lastauthmsg : "(nil)"); + fprintf(f, "\n Commit sent time = %ld\n", + (long) auth->commit_sent_time); +} + +#endif /* * Initialize the fields of an OtrlAuthInfo (already allocated). */ -void otrl_auth_new(OtrlAuthInfo *auth) +void otrl_auth_new(struct context *context) { - auth->authstate = OTRL_AUTHSTATE_NONE; - otrl_dh_keypair_init(&(auth->our_dh)); - auth->our_keyid = 0; - auth->encgx = NULL; - auth->encgx_len = 0; - memset(auth->r, 0, 16); - memset(auth->hashgx, 0, 32); - auth->their_pub = NULL; - auth->their_keyid = 0; - auth->enc_c = NULL; - auth->enc_cp = NULL; - auth->mac_m1 = NULL; - auth->mac_m1p = NULL; - auth->mac_m2 = NULL; - auth->mac_m2p = NULL; - memset(auth->their_fingerprint, 0, 20); - auth->initiated = 0; - auth->protocol_version = 0; - memset(auth->secure_session_id, 0, 20); - auth->secure_session_id_len = 0; - auth->lastauthmsg = NULL; + OtrlAuthInfo *auth = &(context->auth); + auth->authstate = OTRL_AUTHSTATE_NONE; + otrl_dh_keypair_init(&(auth->our_dh)); + auth->our_keyid = 0; + auth->encgx = NULL; + auth->encgx_len = 0; + memset(auth->r, 0, 16); + memset(auth->hashgx, 0, 32); + auth->their_pub = NULL; + auth->their_keyid = 0; + auth->enc_c = NULL; + auth->enc_cp = NULL; + auth->mac_m1 = NULL; + auth->mac_m1p = NULL; + auth->mac_m2 = NULL; + auth->mac_m2p = NULL; + memset(auth->their_fingerprint, 0, 20); + auth->initiated = 0; + auth->protocol_version = 0; + memset(auth->secure_session_id, 0, 20); + auth->secure_session_id_len = 0; + auth->lastauthmsg = NULL; + auth->commit_sent_time = 0; + auth->context = context; } /* @@ -61,135 +103,145 @@ void otrl_auth_new(OtrlAuthInfo *auth) */ void otrl_auth_clear(OtrlAuthInfo *auth) { - auth->authstate = OTRL_AUTHSTATE_NONE; - otrl_dh_keypair_free(&(auth->our_dh)); - auth->our_keyid = 0; - free(auth->encgx); - auth->encgx = NULL; - auth->encgx_len = 0; - memset(auth->r, 0, 16); - memset(auth->hashgx, 0, 32); - gcry_mpi_release(auth->their_pub); - auth->their_pub = NULL; - auth->their_keyid = 0; - gcry_cipher_close(auth->enc_c); - gcry_cipher_close(auth->enc_cp); - gcry_md_close(auth->mac_m1); - gcry_md_close(auth->mac_m1p); - gcry_md_close(auth->mac_m2); - gcry_md_close(auth->mac_m2p); - auth->enc_c = NULL; - auth->enc_cp = NULL; - auth->mac_m1 = NULL; - auth->mac_m1p = NULL; - auth->mac_m2 = NULL; - auth->mac_m2p = NULL; - memset(auth->their_fingerprint, 0, 20); - auth->initiated = 0; - auth->protocol_version = 0; - memset(auth->secure_session_id, 0, 20); - auth->secure_session_id_len = 0; - free(auth->lastauthmsg); - auth->lastauthmsg = NULL; + auth->authstate = OTRL_AUTHSTATE_NONE; + otrl_dh_keypair_free(&(auth->our_dh)); + auth->our_keyid = 0; + free(auth->encgx); + auth->encgx = NULL; + auth->encgx_len = 0; + memset(auth->r, 0, 16); + memset(auth->hashgx, 0, 32); + gcry_mpi_release(auth->their_pub); + auth->their_pub = NULL; + auth->their_keyid = 0; + gcry_cipher_close(auth->enc_c); + gcry_cipher_close(auth->enc_cp); + gcry_md_close(auth->mac_m1); + gcry_md_close(auth->mac_m1p); + gcry_md_close(auth->mac_m2); + gcry_md_close(auth->mac_m2p); + auth->enc_c = NULL; + auth->enc_cp = NULL; + auth->mac_m1 = NULL; + auth->mac_m1p = NULL; + auth->mac_m2 = NULL; + auth->mac_m2p = NULL; + memset(auth->their_fingerprint, 0, 20); + auth->initiated = 0; + auth->protocol_version = 0; + memset(auth->secure_session_id, 0, 20); + auth->secure_session_id_len = 0; + free(auth->lastauthmsg); + auth->lastauthmsg = NULL; + auth->commit_sent_time = 0; } /* - * Start a fresh AKE (version 2) using the given OtrlAuthInfo. Generate + * Start a fresh AKE (version 2 or 3) using the given OtrlAuthInfo. Generate * a fresh DH keypair to use. If no error is returned, the message to * transmit will be contained in auth->lastauthmsg. */ -gcry_error_t otrl_auth_start_v2(OtrlAuthInfo *auth) +gcry_error_t otrl_auth_start_v23(OtrlAuthInfo *auth, int version) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - size_t npub; - gcry_cipher_hd_t enc = NULL; - unsigned char ctr[16]; - unsigned char *buf, *bufp; - size_t buflen, lenp; - - /* Clear out this OtrlAuthInfo and start over */ - otrl_auth_clear(auth); - auth->initiated = 1; - - otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); - auth->our_keyid = 1; - - /* Pick an encryption key */ - gcry_randomize(auth->r, 16, GCRY_STRONG_RANDOM); - - /* Allocate space for the encrypted g^x */ - gcry_mpi_print(format, NULL, 0, &npub, auth->our_dh.pub); - auth->encgx = malloc(4+npub); - if (auth->encgx == NULL) goto memerr; - auth->encgx_len = 4+npub; - bufp = auth->encgx; - lenp = auth->encgx_len; - write_mpi(auth->our_dh.pub, npub, "g^x"); - assert(lenp == 0); - - /* Hash g^x */ - gcry_md_hash_buffer(GCRY_MD_SHA256, auth->hashgx, auth->encgx, - auth->encgx_len); - - /* Encrypt g^x using the key r */ - err = gcry_cipher_open(&enc, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CTR, - GCRY_CIPHER_SECURE); - if (err) goto err; - - err = gcry_cipher_setkey(enc, auth->r, 16); - if (err) goto err; - - memset(ctr, 0, 16); - err = gcry_cipher_setctr(enc, ctr, 16); - if (err) goto err; - - err = gcry_cipher_encrypt(enc, auth->encgx, auth->encgx_len, NULL, 0); - if (err) goto err; - - gcry_cipher_close(enc); - enc = NULL; - - /* Now serialize the message */ - lenp = 3 + 4 + auth->encgx_len + 4 + 32; - bufp = malloc(lenp); - if (bufp == NULL) goto memerr; - buf = bufp; - buflen = lenp; - - memcpy(bufp, "\x00\x02\x02", 3); /* header */ - debug_data("Header", bufp, 3); - bufp += 3; lenp -= 3; - - /* Encrypted g^x */ - write_int(auth->encgx_len); - debug_int("Enc gx len", bufp-4); - memcpy(bufp, auth->encgx, auth->encgx_len); - debug_data("Enc gx", bufp, auth->encgx_len); - bufp += auth->encgx_len; lenp -= auth->encgx_len; - - /* Hashed g^x */ - write_int(32); - debug_int("hashgx len", bufp-4); - memcpy(bufp, auth->hashgx, 32); - debug_data("hashgx", bufp, 32); - bufp += 32; lenp -= 32; - - assert(lenp == 0); - - auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); - free(buf); - if (auth->lastauthmsg == NULL) goto memerr; - auth->authstate = OTRL_AUTHSTATE_AWAITING_DHKEY; - - return err; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + size_t npub; + gcry_cipher_hd_t enc = NULL; + unsigned char ctr[16]; + unsigned char *buf, *bufp; + size_t buflen, lenp; + + /* Clear out this OtrlAuthInfo and start over */ + otrl_auth_clear(auth); + auth->initiated = 1; + auth->protocol_version = version; + auth->context->protocol_version = version; + + otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); + auth->our_keyid = 1; + + /* Pick an encryption key */ + gcry_randomize(auth->r, 16, GCRY_STRONG_RANDOM); + + /* Allocate space for the encrypted g^x */ + gcry_mpi_print(format, NULL, 0, &npub, auth->our_dh.pub); + auth->encgx = malloc(4+npub); + if (auth->encgx == NULL) goto memerr; + auth->encgx_len = 4+npub; + bufp = auth->encgx; + lenp = auth->encgx_len; + write_mpi(auth->our_dh.pub, npub, "g^x"); + assert(lenp == 0); + + /* Hash g^x */ + gcry_md_hash_buffer(GCRY_MD_SHA256, auth->hashgx, auth->encgx, + auth->encgx_len); + + /* Encrypt g^x using the key r */ + err = gcry_cipher_open(&enc, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CTR, + GCRY_CIPHER_SECURE); + if (err) goto err; + + err = gcry_cipher_setkey(enc, auth->r, 16); + if (err) goto err; + + memset(ctr, 0, 16); + err = gcry_cipher_setctr(enc, ctr, 16); + if (err) goto err; + + err = gcry_cipher_encrypt(enc, auth->encgx, auth->encgx_len, NULL, 0); + if (err) goto err; + + gcry_cipher_close(enc); + enc = NULL; + + /* Now serialize the message */ + lenp = OTRL_HEADER_LEN + (auth->protocol_version == 3 ? 8 : 0) + 4 + + auth->encgx_len + 4 + 32; + bufp = malloc(lenp); + if (bufp == NULL) goto memerr; + buf = bufp; + buflen = lenp; + + /* Header */ + write_header(auth->protocol_version, '\x02'); + if (auth->protocol_version == 3) { + /* instance tags */ + write_int(auth->context->our_instance); + debug_int("Sender instag", bufp-4); + write_int(auth->context->their_instance); + debug_int("Recipient instag", bufp-4); + } + + /* Encrypted g^x */ + write_int(auth->encgx_len); + debug_int("Enc gx len", bufp-4); + memmove(bufp, auth->encgx, auth->encgx_len); + debug_data("Enc gx", bufp, auth->encgx_len); + bufp += auth->encgx_len; lenp -= auth->encgx_len; + + /* Hashed g^x */ + write_int(32); + debug_int("hashgx len", bufp-4); + memmove(bufp, auth->hashgx, 32); + debug_data("hashgx", bufp, 32); + bufp += 32; lenp -= 32; + + assert(lenp == 0); + + auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); + free(buf); + if (auth->lastauthmsg == NULL) goto memerr; + auth->authstate = OTRL_AUTHSTATE_AWAITING_DHKEY; + + return err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - otrl_auth_clear(auth); - gcry_cipher_close(enc); - return err; + otrl_auth_clear(auth); + gcry_cipher_close(enc); + return err; } /* @@ -198,38 +250,44 @@ err: */ static gcry_error_t create_key_message(OtrlAuthInfo *auth) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - unsigned char *buf, *bufp; - size_t buflen, lenp; - size_t npub; - - gcry_mpi_print(format, NULL, 0, &npub, auth->our_dh.pub); - buflen = 3 + 4 + npub; - buf = malloc(buflen); - if (buf == NULL) goto memerr; - bufp = buf; - lenp = buflen; - - memcpy(bufp, "\x00\x02\x0a", 3); /* header */ - debug_data("Header", bufp, 3); - bufp += 3; lenp -= 3; - - /* g^y */ - write_mpi(auth->our_dh.pub, npub, "g^y"); - - assert(lenp == 0); - - free(auth->lastauthmsg); - auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); - free(buf); - if (auth->lastauthmsg == NULL) goto memerr; - - return err; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + unsigned char *buf, *bufp; + size_t buflen, lenp; + size_t npub; + + gcry_mpi_print(format, NULL, 0, &npub, auth->our_dh.pub); + buflen = OTRL_HEADER_LEN + (auth->protocol_version == 3 ? 8 : 0) + 4 + npub; + buf = malloc(buflen); + if (buf == NULL) goto memerr; + bufp = buf; + lenp = buflen; + + /* header */ + write_header(auth->protocol_version, '\x0a'); + if (auth->protocol_version == 3) { + /* instance tags */ + write_int(auth->context->our_instance); + debug_int("Sender instag", bufp-4); + write_int(auth->context->their_instance); + debug_int("Recipient instag", bufp-4); + } + + /* g^y */ + write_mpi(auth->our_dh.pub, npub, "g^y"); + + assert(lenp == 0); + + free(auth->lastauthmsg); + auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); + free(buf); + if (auth->lastauthmsg == NULL) goto memerr; + + return err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); - return err; + err = gcry_error(GPG_ERR_ENOMEM); + return err; } /* @@ -238,112 +296,131 @@ memerr: * keypair to use. */ gcry_error_t otrl_auth_handle_commit(OtrlAuthInfo *auth, - const char *commitmsg) + const char *commitmsg, int version) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp = NULL, *encbuf = NULL; - unsigned char hashbuf[32]; - size_t buflen, lenp, enclen, hashlen; - int res; - - res = otrl_base64_otr_decode(commitmsg, &buf, &buflen); - if (res == -1) goto memerr; - if (res == -2) goto invval; - - bufp = buf; - lenp = buflen; - - /* Header */ - require_len(3); - if (memcmp(bufp, "\x00\x02\x02", 3)) goto invval; - bufp += 3; lenp -= 3; - - /* Encrypted g^x */ - read_int(enclen); - require_len(enclen); - encbuf = malloc(enclen); - if (encbuf == NULL && enclen > 0) goto memerr; - memcpy(encbuf, bufp, enclen); - bufp += enclen; lenp -= enclen; - - /* Hashed g^x */ - read_int(hashlen); - if (hashlen != 32) goto invval; - require_len(32); - memcpy(hashbuf, bufp, 32); - bufp += 32; lenp -= 32; - - if (lenp != 0) goto invval; - free(buf); - buf = NULL; - - switch(auth->authstate) { + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp = NULL, *encbuf = NULL; + unsigned char hashbuf[32]; + size_t buflen, lenp, enclen, hashlen; + int res; + + /* Are we the auth for the master context? */ + int is_master = (auth->context->m_context == auth->context); + + res = otrl_base64_otr_decode(commitmsg, &buf, &buflen); + if (res == -1) goto memerr; + if (res == -2) goto invval; + + bufp = buf; + lenp = buflen; + + /* Header */ + auth->protocol_version = version; + auth->context->protocol_version = version; + skip_header('\x02'); + + if (version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } + + /* Encrypted g^x */ + read_int(enclen); + require_len(enclen); + encbuf = malloc(enclen); + if (encbuf == NULL && enclen > 0) goto memerr; + memmove(encbuf, bufp, enclen); + bufp += enclen; lenp -= enclen; + + /* Hashed g^x */ + read_int(hashlen); + if (hashlen != 32) goto invval; + require_len(32); + memmove(hashbuf, bufp, 32); + bufp += 32; lenp -= 32; + + if (lenp != 0) goto invval; + free(buf); + buf = NULL; + + switch(auth->authstate) { case OTRL_AUTHSTATE_NONE: case OTRL_AUTHSTATE_AWAITING_SIG: case OTRL_AUTHSTATE_V1_SETUP: + /* Store the incoming information */ + otrl_auth_clear(auth); + auth->protocol_version = version; - /* Store the incoming information */ - otrl_auth_clear(auth); - otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); - auth->our_keyid = 1; - auth->encgx = encbuf; - encbuf = NULL; - auth->encgx_len = enclen; - memcpy(auth->hashgx, hashbuf, 32); + otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); - /* Create a D-H Key Message */ - err = create_key_message(auth); - if (err) goto err; - auth->authstate = OTRL_AUTHSTATE_AWAITING_REVEALSIG; + auth->our_keyid = 1; + auth->encgx = encbuf; + encbuf = NULL; + auth->encgx_len = enclen; + memmove(auth->hashgx, hashbuf, 32); - break; + /* Create a D-H Key Message */ + err = create_key_message(auth); + if (err) goto err; + auth->authstate = OTRL_AUTHSTATE_AWAITING_REVEALSIG; + break; case OTRL_AUTHSTATE_AWAITING_DHKEY: - /* We sent a D-H Commit Message, and we also received one - * back. Compare the hashgx values to see which one wins. */ - if (memcmp(auth->hashgx, hashbuf, 32) > 0) { + /* We sent a D-H Commit Message, and we also received one + * back. If we're the master context, then the keypair in here + * is probably stale; we just kept it around for a little + * while in case some other logged in instance of our buddy + * replied with a DHKEY message. In that case, use the + * incoming parameters. Otherwise, compare the hashgx + * values to see which one wins. + * + * This does NOT use constant time comparison because these + * are two public values thus don't need it. Also, this checks + * which pubkey is larger and not if they are the same. */ + if (!is_master && memcmp(auth->hashgx, hashbuf, 32) > 0) { /* Ours wins. Ignore the message we received, and just * resend the same D-H Commit message again. */ free(encbuf); encbuf = NULL; - } else { + } else { /* Ours loses. Use the incoming parameters instead. */ otrl_auth_clear(auth); + auth->protocol_version = version; otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); auth->our_keyid = 1; auth->encgx = encbuf; encbuf = NULL; auth->encgx_len = enclen; - memcpy(auth->hashgx, hashbuf, 32); + memmove(auth->hashgx, hashbuf, 32); /* Create a D-H Key Message */ err = create_key_message(auth); if (err) goto err; auth->authstate = OTRL_AUTHSTATE_AWAITING_REVEALSIG; - } - break; + } + break; case OTRL_AUTHSTATE_AWAITING_REVEALSIG: - /* Use the incoming parameters, but just retransmit the old - * D-H Key Message. */ - free(auth->encgx); - auth->encgx = encbuf; - encbuf = NULL; - auth->encgx_len = enclen; - memcpy(auth->hashgx, hashbuf, 32); - break; - } - - return err; + /* Use the incoming parameters, but just retransmit the old + * D-H Key Message. */ + free(auth->encgx); + auth->encgx = encbuf; + encbuf = NULL; + auth->encgx_len = enclen; + memmove(auth->hashgx, hashbuf, 32); + break; + } + + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(encbuf); - return err; + free(buf); + free(encbuf); + return err; } /* @@ -358,92 +435,92 @@ static gcry_error_t calculate_pubkey_auth(unsigned char **authbufp, gcry_mpi_t our_dh_pub, gcry_mpi_t their_dh_pub, OtrlPrivKey *privkey, unsigned int keyid) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - size_t ourpublen, theirpublen, totallen, lenp; - unsigned char *buf = NULL, *bufp = NULL; - unsigned char macbuf[32]; - unsigned char *sigbuf = NULL; - size_t siglen; - - /* How big are the DH public keys? */ - gcry_mpi_print(format, NULL, 0, &ourpublen, our_dh_pub); - gcry_mpi_print(format, NULL, 0, &theirpublen, their_dh_pub); - - /* How big is the total structure to be MAC'd? */ - totallen = 4 + ourpublen + 4 + theirpublen + 2 + privkey->pubkey_datalen - + 4; - buf = malloc(totallen); - if (buf == NULL) goto memerr; - - bufp = buf; - lenp = totallen; - - /* Write the data to be MAC'd */ - write_mpi(our_dh_pub, ourpublen, "Our DH pubkey"); - write_mpi(their_dh_pub, theirpublen, "Their DH pubkey"); - bufp[0] = ((privkey->pubkey_type) >> 8) & 0xff; - bufp[1] = (privkey->pubkey_type) & 0xff; - bufp += 2; lenp -= 2; - memcpy(bufp, privkey->pubkey_data, privkey->pubkey_datalen); - debug_data("Pubkey", bufp, privkey->pubkey_datalen); - bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; - write_int(keyid); - debug_int("Keyid", bufp-4); - - assert(lenp == 0); - - /* Do the MAC */ - gcry_md_reset(mackey); - gcry_md_write(mackey, buf, totallen); - memcpy(macbuf, gcry_md_read(mackey, GCRY_MD_SHA256), 32); - - free(buf); - buf = NULL; - - /* Sign the MAC */ - err = otrl_privkey_sign(&sigbuf, &siglen, privkey, macbuf, 32); - if (err) goto err; - - /* Calculate the total size of the structure to be encrypted */ - totallen = 2 + privkey->pubkey_datalen + 4 + siglen; - buf = malloc(totallen); - if (buf == NULL) goto memerr; - bufp = buf; - lenp = totallen; - - /* Write the data to be encrypted */ - bufp[0] = ((privkey->pubkey_type) >> 8) & 0xff; - bufp[1] = (privkey->pubkey_type) & 0xff; - bufp += 2; lenp -= 2; - memcpy(bufp, privkey->pubkey_data, privkey->pubkey_datalen); - debug_data("Pubkey", bufp, privkey->pubkey_datalen); - bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; - write_int(keyid); - debug_int("Keyid", bufp-4); - memcpy(bufp, sigbuf, siglen); - debug_data("Signature", bufp, siglen); - bufp += siglen; lenp -= siglen; - free(sigbuf); - sigbuf = NULL; - - assert(lenp == 0); - - /* Now do the encryption */ - err = gcry_cipher_encrypt(enckey, buf, totallen, NULL, 0); - if (err) goto err; - - *authbufp = buf; - buf = NULL; - *authlenp = totallen; - - return err; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + size_t ourpublen, theirpublen, totallen, lenp; + unsigned char *buf = NULL, *bufp = NULL; + unsigned char macbuf[32]; + unsigned char *sigbuf = NULL; + size_t siglen; + + /* How big are the DH public keys? */ + gcry_mpi_print(format, NULL, 0, &ourpublen, our_dh_pub); + gcry_mpi_print(format, NULL, 0, &theirpublen, their_dh_pub); + + /* How big is the total structure to be MAC'd? */ + totallen = 4 + ourpublen + 4 + theirpublen + 2 + privkey->pubkey_datalen + + 4; + buf = malloc(totallen); + if (buf == NULL) goto memerr; + + bufp = buf; + lenp = totallen; + + /* Write the data to be MAC'd */ + write_mpi(our_dh_pub, ourpublen, "Our DH pubkey"); + write_mpi(their_dh_pub, theirpublen, "Their DH pubkey"); + bufp[0] = ((privkey->pubkey_type) >> 8) & 0xff; + bufp[1] = (privkey->pubkey_type) & 0xff; + bufp += 2; lenp -= 2; + memmove(bufp, privkey->pubkey_data, privkey->pubkey_datalen); + debug_data("Pubkey", bufp, privkey->pubkey_datalen); + bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; + write_int(keyid); + debug_int("Keyid", bufp-4); + + assert(lenp == 0); + + /* Do the MAC */ + gcry_md_reset(mackey); + gcry_md_write(mackey, buf, totallen); + memmove(macbuf, gcry_md_read(mackey, GCRY_MD_SHA256), 32); + + free(buf); + buf = NULL; + + /* Sign the MAC */ + err = otrl_privkey_sign(&sigbuf, &siglen, privkey, macbuf, 32); + if (err) goto err; + + /* Calculate the total size of the structure to be encrypted */ + totallen = 2 + privkey->pubkey_datalen + 4 + siglen; + buf = malloc(totallen); + if (buf == NULL) goto memerr; + bufp = buf; + lenp = totallen; + + /* Write the data to be encrypted */ + bufp[0] = ((privkey->pubkey_type) >> 8) & 0xff; + bufp[1] = (privkey->pubkey_type) & 0xff; + bufp += 2; lenp -= 2; + memmove(bufp, privkey->pubkey_data, privkey->pubkey_datalen); + debug_data("Pubkey", bufp, privkey->pubkey_datalen); + bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; + write_int(keyid); + debug_int("Keyid", bufp-4); + memmove(bufp, sigbuf, siglen); + debug_data("Signature", bufp, siglen); + bufp += siglen; lenp -= siglen; + free(sigbuf); + sigbuf = NULL; + + assert(lenp == 0); + + /* Now do the encryption */ + err = gcry_cipher_encrypt(enckey, buf, totallen, NULL, 0); + if (err) goto err; + + *authbufp = buf; + buf = NULL; + *authlenp = totallen; + + return err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(sigbuf); - return err; + free(buf); + free(sigbuf); + return err; } /* @@ -458,107 +535,107 @@ static gcry_error_t check_pubkey_auth(unsigned char fingerprintbufp[20], gcry_md_hd_t mackey, gcry_cipher_hd_t enckey, gcry_mpi_t our_dh_pub, gcry_mpi_t their_dh_pub) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - size_t ourpublen, theirpublen, totallen, lenp; - unsigned char *buf = NULL, *bufp = NULL; - unsigned char macbuf[32]; - unsigned short pubkey_type; - gcry_mpi_t p,q,g,y; - gcry_sexp_t pubs = NULL; - unsigned int received_keyid; - unsigned char *fingerprintstart, *fingerprintend, *sigbuf; - size_t siglen; - - /* Start by decrypting it */ - err = gcry_cipher_decrypt(enckey, authbuf, authlen, NULL, 0); - if (err) goto err; - - bufp = authbuf; - lenp = authlen; - - /* Get the public key and calculate its fingerprint */ - require_len(2); - pubkey_type = (bufp[0] << 8) + bufp[1]; - bufp += 2; lenp -= 2; - if (pubkey_type != OTRL_PUBKEY_TYPE_DSA) goto invval; - fingerprintstart = bufp; - read_mpi(p); - read_mpi(q); - read_mpi(g); - read_mpi(y); - fingerprintend = bufp; - gcry_md_hash_buffer(GCRY_MD_SHA1, fingerprintbufp, - fingerprintstart, fingerprintend-fingerprintstart); - gcry_sexp_build(&pubs, NULL, + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + size_t ourpublen, theirpublen, totallen, lenp; + unsigned char *buf = NULL, *bufp = NULL; + unsigned char macbuf[32]; + unsigned short pubkey_type; + gcry_mpi_t p,q,g,y; + gcry_sexp_t pubs = NULL; + unsigned int received_keyid; + unsigned char *fingerprintstart, *fingerprintend, *sigbuf; + size_t siglen; + + /* Start by decrypting it */ + err = gcry_cipher_decrypt(enckey, authbuf, authlen, NULL, 0); + if (err) goto err; + + bufp = authbuf; + lenp = authlen; + + /* Get the public key and calculate its fingerprint */ + require_len(2); + pubkey_type = (bufp[0] << 8) + bufp[1]; + bufp += 2; lenp -= 2; + if (pubkey_type != OTRL_PUBKEY_TYPE_DSA) goto invval; + fingerprintstart = bufp; + read_mpi(p); + read_mpi(q); + read_mpi(g); + read_mpi(y); + fingerprintend = bufp; + gcry_md_hash_buffer(GCRY_MD_SHA1, fingerprintbufp, + fingerprintstart, fingerprintend-fingerprintstart); + gcry_sexp_build(&pubs, NULL, "(public-key (dsa (p %m)(q %m)(g %m)(y %m)))", p, q, g, y); - gcry_mpi_release(p); - gcry_mpi_release(q); - gcry_mpi_release(g); - gcry_mpi_release(y); + gcry_mpi_release(p); + gcry_mpi_release(q); + gcry_mpi_release(g); + gcry_mpi_release(y); - /* Get the keyid */ - read_int(received_keyid); - if (received_keyid == 0) goto invval; + /* Get the keyid */ + read_int(received_keyid); + if (received_keyid == 0) goto invval; - /* Get the signature */ - sigbuf = bufp; - siglen = lenp; + /* Get the signature */ + sigbuf = bufp; + siglen = lenp; - /* How big are the DH public keys? */ - gcry_mpi_print(format, NULL, 0, &ourpublen, our_dh_pub); - gcry_mpi_print(format, NULL, 0, &theirpublen, their_dh_pub); + /* How big are the DH public keys? */ + gcry_mpi_print(format, NULL, 0, &ourpublen, our_dh_pub); + gcry_mpi_print(format, NULL, 0, &theirpublen, their_dh_pub); - /* Now calculate the message to be MAC'd. */ - totallen = 4 + ourpublen + 4 + theirpublen + 2 + + /* Now calculate the message to be MAC'd. */ + totallen = 4 + ourpublen + 4 + theirpublen + 2 + (fingerprintend - fingerprintstart) + 4; - buf = malloc(totallen); - if (buf == NULL) goto memerr; - - bufp = buf; - lenp = totallen; - - write_mpi(their_dh_pub, theirpublen, "Their DH pubkey"); - write_mpi(our_dh_pub, ourpublen, "Our DH pubkey"); - bufp[0] = (pubkey_type >> 8) & 0xff; - bufp[1] = pubkey_type & 0xff; - bufp += 2; lenp -= 2; - memcpy(bufp, fingerprintstart, fingerprintend - fingerprintstart); - debug_data("Pubkey", bufp, fingerprintend - fingerprintstart); - bufp += fingerprintend - fingerprintstart; - lenp -= fingerprintend - fingerprintstart; - write_int(received_keyid); - debug_int("Keyid", bufp-4); - - assert(lenp == 0); - - /* Do the MAC */ - gcry_md_reset(mackey); - gcry_md_write(mackey, buf, totallen); - memcpy(macbuf, gcry_md_read(mackey, GCRY_MD_SHA256), 32); - - free(buf); - buf = NULL; - - /* Verify the signature on the MAC */ - err = otrl_privkey_verify(sigbuf, siglen, pubkey_type, pubs, macbuf, 32); - if (err) goto err; - gcry_sexp_release(pubs); - pubs = NULL; - - /* Everything checked out */ - *keyidp = received_keyid; - - return err; + buf = malloc(totallen); + if (buf == NULL) goto memerr; + + bufp = buf; + lenp = totallen; + + write_mpi(their_dh_pub, theirpublen, "Their DH pubkey"); + write_mpi(our_dh_pub, ourpublen, "Our DH pubkey"); + bufp[0] = (pubkey_type >> 8) & 0xff; + bufp[1] = pubkey_type & 0xff; + bufp += 2; lenp -= 2; + memmove(bufp, fingerprintstart, fingerprintend - fingerprintstart); + debug_data("Pubkey", bufp, fingerprintend - fingerprintstart); + bufp += fingerprintend - fingerprintstart; + lenp -= fingerprintend - fingerprintstart; + write_int(received_keyid); + debug_int("Keyid", bufp-4); + + assert(lenp == 0); + + /* Do the MAC */ + gcry_md_reset(mackey); + gcry_md_write(mackey, buf, totallen); + memmove(macbuf, gcry_md_read(mackey, GCRY_MD_SHA256), 32); + + free(buf); + buf = NULL; + + /* Verify the signature on the MAC */ + err = otrl_privkey_verify(sigbuf, siglen, pubkey_type, pubs, macbuf, 32); + if (err) goto err; + gcry_sexp_release(pubs); + pubs = NULL; + + /* Everything checked out */ + *keyidp = received_keyid; + + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - gcry_sexp_release(pubs); - return err; + free(buf); + gcry_sexp_release(pubs); + return err; } /* @@ -569,67 +646,74 @@ err: static gcry_error_t create_revealsig_message(OtrlAuthInfo *auth, OtrlPrivKey *privkey) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp, *startmac; - size_t buflen, lenp; - - unsigned char *authbuf = NULL; - size_t authlen; - - /* Get the encrypted authenticator */ - err = calculate_pubkey_auth(&authbuf, &authlen, auth->mac_m1, auth->enc_c, - auth->our_dh.pub, auth->their_pub, privkey, auth->our_keyid); - if (err) goto err; - - buflen = 3 + 4 + 16 + 4 + authlen + 20; - buf = malloc(buflen); - if (buf == NULL) goto memerr; - - bufp = buf; - lenp = buflen; - - memcpy(bufp, "\x00\x02\x11", 3); /* header */ - debug_data("Header", bufp, 3); - bufp += 3; lenp -= 3; - - /* r */ - write_int(16); - memcpy(bufp, auth->r, 16); - debug_data("r", bufp, 16); - bufp += 16; lenp -= 16; - - /* Encrypted authenticator */ - startmac = bufp; - write_int(authlen); - memcpy(bufp, authbuf, authlen); - debug_data("auth", bufp, authlen); - bufp += authlen; lenp -= authlen; - free(authbuf); - authbuf = NULL; - - /* MAC it, but only take the first 20 bytes */ - gcry_md_reset(auth->mac_m2); - gcry_md_write(auth->mac_m2, startmac, bufp - startmac); - memcpy(bufp, gcry_md_read(auth->mac_m2, GCRY_MD_SHA256), 20); - debug_data("MAC", bufp, 20); - bufp += 20; lenp -= 20; - - assert(lenp == 0); - - free(auth->lastauthmsg); - auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); - if (auth->lastauthmsg == NULL) goto memerr; - free(buf); - buf = NULL; - - return err; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp, *startmac; + size_t buflen, lenp; + + unsigned char *authbuf = NULL; + size_t authlen; + + /* Get the encrypted authenticator */ + err = calculate_pubkey_auth(&authbuf, &authlen, auth->mac_m1, auth->enc_c, + auth->our_dh.pub, auth->their_pub, privkey, auth->our_keyid); + if (err) goto err; + + buflen = OTRL_HEADER_LEN + (auth->protocol_version == 3 ? 8 : 0) + 4 + 16 + + 4 + authlen + 20; + buf = malloc(buflen); + if (buf == NULL) goto memerr; + + bufp = buf; + lenp = buflen; + + /* header */ + write_header(auth->protocol_version, '\x11'); + if (auth->protocol_version == 3) { + /* instance tags */ + write_int(auth->context->our_instance); + debug_int("Sender instag", bufp-4); + write_int(auth->context->their_instance); + debug_int("Recipient instag", bufp-4); + } + + /* r */ + write_int(16); + memmove(bufp, auth->r, 16); + debug_data("r", bufp, 16); + bufp += 16; lenp -= 16; + + /* Encrypted authenticator */ + startmac = bufp; + write_int(authlen); + memmove(bufp, authbuf, authlen); + debug_data("auth", bufp, authlen); + bufp += authlen; lenp -= authlen; + free(authbuf); + authbuf = NULL; + + /* MAC it, but only take the first 20 bytes */ + gcry_md_reset(auth->mac_m2); + gcry_md_write(auth->mac_m2, startmac, bufp - startmac); + memmove(bufp, gcry_md_read(auth->mac_m2, GCRY_MD_SHA256), 20); + debug_data("MAC", bufp, 20); + bufp += 20; lenp -= 20; + + assert(lenp == 0); + + free(auth->lastauthmsg); + auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); + if (auth->lastauthmsg == NULL) goto memerr; + free(buf); + buf = NULL; + + return err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(authbuf); - return err; + free(buf); + free(authbuf); + return err; } /* @@ -640,62 +724,69 @@ err: static gcry_error_t create_signature_message(OtrlAuthInfo *auth, OtrlPrivKey *privkey) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp, *startmac; - size_t buflen, lenp; - - unsigned char *authbuf = NULL; - size_t authlen; - - /* Get the encrypted authenticator */ - err = calculate_pubkey_auth(&authbuf, &authlen, auth->mac_m1p, - auth->enc_cp, auth->our_dh.pub, auth->their_pub, privkey, - auth->our_keyid); - if (err) goto err; - - buflen = 3 + 4 + authlen + 20; - buf = malloc(buflen); - if (buf == NULL) goto memerr; - - bufp = buf; - lenp = buflen; - - memcpy(bufp, "\x00\x02\x12", 3); /* header */ - debug_data("Header", bufp, 3); - bufp += 3; lenp -= 3; - - /* Encrypted authenticator */ - startmac = bufp; - write_int(authlen); - memcpy(bufp, authbuf, authlen); - debug_data("auth", bufp, authlen); - bufp += authlen; lenp -= authlen; - free(authbuf); - authbuf = NULL; - - /* MAC it, but only take the first 20 bytes */ - gcry_md_reset(auth->mac_m2p); - gcry_md_write(auth->mac_m2p, startmac, bufp - startmac); - memcpy(bufp, gcry_md_read(auth->mac_m2p, GCRY_MD_SHA256), 20); - debug_data("MAC", bufp, 20); - bufp += 20; lenp -= 20; - - assert(lenp == 0); - - free(auth->lastauthmsg); - auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); - if (auth->lastauthmsg == NULL) goto memerr; - free(buf); - buf = NULL; - - return err; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp, *startmac; + size_t buflen, lenp; + + unsigned char *authbuf = NULL; + size_t authlen; + + /* Get the encrypted authenticator */ + err = calculate_pubkey_auth(&authbuf, &authlen, auth->mac_m1p, + auth->enc_cp, auth->our_dh.pub, auth->their_pub, privkey, + auth->our_keyid); + if (err) goto err; + + buflen = OTRL_HEADER_LEN + (auth->protocol_version == 3 ? 8 : 0) + 4 + + authlen + 20; + buf = malloc(buflen); + if (buf == NULL) goto memerr; + + bufp = buf; + lenp = buflen; + + /* header */ + write_header(auth->protocol_version, '\x12'); + if (auth->protocol_version == 3) { + /* instance tags */ + write_int(auth->context->our_instance); + debug_int("Sender instag", bufp-4); + write_int(auth->context->their_instance); + debug_int("Recipient instag", bufp-4); + } + + /* Encrypted authenticator */ + startmac = bufp; + write_int(authlen); + memmove(bufp, authbuf, authlen); + debug_data("auth", bufp, authlen); + bufp += authlen; lenp -= authlen; + free(authbuf); + authbuf = NULL; + + /* MAC it, but only take the first 20 bytes */ + gcry_md_reset(auth->mac_m2p); + gcry_md_write(auth->mac_m2p, startmac, bufp - startmac); + memmove(bufp, gcry_md_read(auth->mac_m2p, GCRY_MD_SHA256), 20); + debug_data("MAC", bufp, 20); + bufp += 20; lenp -= 20; + + assert(lenp == 0); + + free(auth->lastauthmsg); + auth->lastauthmsg = otrl_base64_otr_encode(buf, buflen); + if (auth->lastauthmsg == NULL) goto memerr; + free(buf); + buf = NULL; + + return err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(authbuf); - return err; + free(buf); + free(authbuf); + return err; } /* @@ -706,85 +797,99 @@ err: gcry_error_t otrl_auth_handle_key(OtrlAuthInfo *auth, const char *keymsg, int *havemsgp, OtrlPrivKey *privkey) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp = NULL; - size_t buflen, lenp; - gcry_mpi_t incoming_pub = NULL; - int res; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp = NULL; + size_t buflen, lenp; + gcry_mpi_t incoming_pub = NULL; + int res; + unsigned int msg_version; - *havemsgp = 0; + *havemsgp = 0; - res = otrl_base64_otr_decode(keymsg, &buf, &buflen); - if (res == -1) goto memerr; - if (res == -2) goto invval; + msg_version = otrl_proto_message_version(keymsg); - bufp = buf; - lenp = buflen; + res = otrl_base64_otr_decode(keymsg, &buf, &buflen); + if (res == -1) goto memerr; + if (res == -2) goto invval; - /* Header */ - if (memcmp(bufp, "\x00\x02\x0a", 3)) goto invval; - bufp += 3; lenp -= 3; + bufp = buf; + lenp = buflen; - /* g^y */ - read_mpi(incoming_pub); + /* Header */ + skip_header('\x0a'); - if (lenp != 0) goto invval; - free(buf); - buf = NULL; + if (msg_version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } - switch(auth->authstate) { - case OTRL_AUTHSTATE_AWAITING_DHKEY: - /* Store the incoming public key */ - gcry_mpi_release(auth->their_pub); - auth->their_pub = incoming_pub; - incoming_pub = NULL; - - /* Compute the encryption and MAC keys */ - err = otrl_dh_compute_v2_auth_keys(&(auth->our_dh), - auth->their_pub, auth->secure_session_id, - &(auth->secure_session_id_len), - &(auth->enc_c), &(auth->enc_cp), - &(auth->mac_m1), &(auth->mac_m1p), - &(auth->mac_m2), &(auth->mac_m2p)); - if (err) goto err; + /* g^y */ + read_mpi(incoming_pub); - /* Create the Reveal Signature Message */ - err = create_revealsig_message(auth, privkey); - if (err) goto err; - *havemsgp = 1; - auth->authstate = OTRL_AUTHSTATE_AWAITING_SIG; + if (lenp != 0) goto invval; + free(buf); + buf = NULL; - break; + switch(auth->authstate) { + case OTRL_AUTHSTATE_AWAITING_DHKEY: + /* The other party may also be establishing a session with + another instance running a different version. Ignore any + DHKEY messages we aren't expecting. */ + if (msg_version != auth->protocol_version) { + goto err; + } + + /* Store the incoming public key */ + gcry_mpi_release(auth->their_pub); + auth->their_pub = incoming_pub; + incoming_pub = NULL; + + /* Compute the encryption and MAC keys */ + err = otrl_dh_compute_v2_auth_keys(&(auth->our_dh), + auth->their_pub, auth->secure_session_id, + &(auth->secure_session_id_len), + &(auth->enc_c), &(auth->enc_cp), + &(auth->mac_m1), &(auth->mac_m1p), + &(auth->mac_m2), &(auth->mac_m2p)); + if (err) goto err; + + /* Create the Reveal Signature Message */ + err = create_revealsig_message(auth, privkey); + if (err) goto err; + *havemsgp = 1; + auth->authstate = OTRL_AUTHSTATE_AWAITING_SIG; + + break; case OTRL_AUTHSTATE_AWAITING_SIG: - if (gcry_mpi_cmp(incoming_pub, auth->their_pub) == 0) { + if (gcry_mpi_cmp(incoming_pub, auth->their_pub) == 0) { /* Retransmit the Reveal Signature Message */ *havemsgp = 1; - } else { + } else { /* Ignore this message */ *havemsgp = 0; - } - break; + } + break; case OTRL_AUTHSTATE_NONE: case OTRL_AUTHSTATE_AWAITING_REVEALSIG: case OTRL_AUTHSTATE_V1_SETUP: - /* Ignore this message */ - *havemsgp = 0; - break; - } + /* Ignore this message */ + *havemsgp = 0; + break; + } - gcry_mpi_release(incoming_pub); - return err; + gcry_mpi_release(incoming_pub); + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - gcry_mpi_release(incoming_pub); - return err; + free(buf); + gcry_mpi_release(incoming_pub); + return err; } /* @@ -799,162 +904,172 @@ gcry_error_t otrl_auth_handle_revealsig(OtrlAuthInfo *auth, gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), void *asdata) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp = NULL, *gxbuf = NULL; - unsigned char *authstart, *authend, *macstart; - size_t buflen, lenp, rlen, authlen; - gcry_cipher_hd_t enc = NULL; - gcry_mpi_t incoming_pub = NULL; - unsigned char ctr[16], hashbuf[32]; - int res; - - *havemsgp = 0; - - res = otrl_base64_otr_decode(revealmsg, &buf, &buflen); - if (res == -1) goto memerr; - if (res == -2) goto invval; - - bufp = buf; - lenp = buflen; - - /* Header */ - if (memcmp(bufp, "\x00\x02\x11", 3)) goto invval; - bufp += 3; lenp -= 3; - - /* r */ - read_int(rlen); - if (rlen != 16) goto invval; - require_len(rlen); - memcpy(auth->r, bufp, rlen); - bufp += rlen; lenp -= rlen; - - /* auth */ - authstart = bufp; - read_int(authlen); - require_len(authlen); - bufp += authlen; lenp -= authlen; - authend = bufp; - - /* MAC */ - require_len(20); - macstart = bufp; - bufp += 20; lenp -= 20; - - if (lenp != 0) goto invval; - - switch(auth->authstate) { + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp = NULL, *gxbuf = NULL; + unsigned char *authstart, *authend, *macstart; + size_t buflen, lenp, rlen, authlen; + gcry_cipher_hd_t enc = NULL; + gcry_mpi_t incoming_pub = NULL; + unsigned char ctr[16], hashbuf[32]; + int res; + unsigned char version; + + *havemsgp = 0; + + res = otrl_base64_otr_decode(revealmsg, &buf, &buflen); + if (res == -1) goto memerr; + if (res == -2) goto invval; + + bufp = buf; + lenp = buflen; + + require_len(3); + version = bufp[1]; + + /* Header */ + skip_header('\x11'); + + if (version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } + + /* r */ + read_int(rlen); + if (rlen != 16) goto invval; + require_len(rlen); + memmove(auth->r, bufp, rlen); + bufp += rlen; lenp -= rlen; + + /* auth */ + authstart = bufp; + read_int(authlen); + require_len(authlen); + bufp += authlen; lenp -= authlen; + authend = bufp; + + /* MAC */ + require_len(20); + macstart = bufp; + bufp += 20; lenp -= 20; + + if (lenp != 0) goto invval; + + switch(auth->authstate) { case OTRL_AUTHSTATE_AWAITING_REVEALSIG: - gxbuf = malloc(auth->encgx_len); - if (auth->encgx_len && gxbuf == NULL) goto memerr; - - /* Use r to decrypt the value of g^x we received earlier */ - err = gcry_cipher_open(&enc, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CTR, - GCRY_CIPHER_SECURE); - if (err) goto err; - - err = gcry_cipher_setkey(enc, auth->r, 16); - if (err) goto err; - - memset(ctr, 0, 16); - err = gcry_cipher_setctr(enc, ctr, 16); - if (err) goto err; - - err = gcry_cipher_decrypt(enc, gxbuf, auth->encgx_len, - auth->encgx, auth->encgx_len); - if (err) goto err; - - gcry_cipher_close(enc); - enc = NULL; - - /* Check the hash */ - gcry_md_hash_buffer(GCRY_MD_SHA256, hashbuf, gxbuf, - auth->encgx_len); - if (memcmp(hashbuf, auth->hashgx, 32)) goto decfail; - - /* Extract g^x */ - bufp = gxbuf; - lenp = auth->encgx_len; - - read_mpi(incoming_pub); - free(gxbuf); - gxbuf = NULL; - - if (lenp != 0) goto invval; - - gcry_mpi_release(auth->their_pub); - auth->their_pub = incoming_pub; - incoming_pub = NULL; - - /* Compute the encryption and MAC keys */ - err = otrl_dh_compute_v2_auth_keys(&(auth->our_dh), - auth->their_pub, auth->secure_session_id, - &(auth->secure_session_id_len), - &(auth->enc_c), &(auth->enc_cp), - &(auth->mac_m1), &(auth->mac_m1p), - &(auth->mac_m2), &(auth->mac_m2p)); - if (err) goto err; - - /* Check the MAC */ - gcry_md_reset(auth->mac_m2); - gcry_md_write(auth->mac_m2, authstart, authend - authstart); - if (memcmp(macstart, + gxbuf = malloc(auth->encgx_len); + if (auth->encgx_len && gxbuf == NULL) goto memerr; + + /* Use r to decrypt the value of g^x we received earlier */ + err = gcry_cipher_open(&enc, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CTR, + GCRY_CIPHER_SECURE); + if (err) goto err; + + err = gcry_cipher_setkey(enc, auth->r, 16); + if (err) goto err; + + memset(ctr, 0, 16); + err = gcry_cipher_setctr(enc, ctr, 16); + if (err) goto err; + + err = gcry_cipher_decrypt(enc, gxbuf, auth->encgx_len, + auth->encgx, auth->encgx_len); + if (err) goto err; + + gcry_cipher_close(enc); + enc = NULL; + + /* Check the hash */ + gcry_md_hash_buffer(GCRY_MD_SHA256, hashbuf, gxbuf, + auth->encgx_len); + /* This isn't comparing secret data, but may as well use the + * constant-time version. */ + if (otrl_mem_differ(hashbuf, auth->hashgx, 32)) goto decfail; + + /* Extract g^x */ + bufp = gxbuf; + lenp = auth->encgx_len; + + read_mpi(incoming_pub); + free(gxbuf); + gxbuf = NULL; + + if (lenp != 0) goto invval; + + gcry_mpi_release(auth->their_pub); + auth->their_pub = incoming_pub; + incoming_pub = NULL; + + /* Compute the encryption and MAC keys */ + err = otrl_dh_compute_v2_auth_keys(&(auth->our_dh), + auth->their_pub, auth->secure_session_id, + &(auth->secure_session_id_len), + &(auth->enc_c), &(auth->enc_cp), + &(auth->mac_m1), &(auth->mac_m1p), + &(auth->mac_m2), &(auth->mac_m2p)); + if (err) goto err; + + /* Check the MAC */ + gcry_md_reset(auth->mac_m2); + gcry_md_write(auth->mac_m2, authstart, authend - authstart); + + if (otrl_mem_differ(macstart, gcry_md_read(auth->mac_m2, GCRY_MD_SHA256), 20)) goto invval; - /* Check the auth */ - err = check_pubkey_auth(auth->their_fingerprint, - &(auth->their_keyid), authstart + 4, - authend - authstart - 4, auth->mac_m1, auth->enc_c, - auth->our_dh.pub, auth->their_pub); - if (err) goto err; - - authstart = NULL; - authend = NULL; - macstart = NULL; - free(buf); - buf = NULL; - - /* Create the Signature Message */ - err = create_signature_message(auth, privkey); - if (err) goto err; - - /* No error? Then we've completed our end of the - * authentication. */ - auth->protocol_version = 2; - auth->session_id_half = OTRL_SESSIONID_SECOND_HALF_BOLD; - if (auth_succeeded) err = auth_succeeded(auth, asdata); - *havemsgp = 1; - auth->our_keyid = 0; - auth->authstate = OTRL_AUTHSTATE_NONE; - - break; + /* Check the auth */ + err = check_pubkey_auth(auth->their_fingerprint, + &(auth->their_keyid), authstart + 4, + authend - authstart - 4, auth->mac_m1, auth->enc_c, + auth->our_dh.pub, auth->their_pub); + if (err) goto err; + + authstart = NULL; + authend = NULL; + macstart = NULL; + free(buf); + buf = NULL; + + /* Create the Signature Message */ + err = create_signature_message(auth, privkey); + if (err) goto err; + + /* No error? Then we've completed our end of the + * authentication. */ + auth->session_id_half = OTRL_SESSIONID_SECOND_HALF_BOLD; + if (auth_succeeded) err = auth_succeeded(auth, asdata); + *havemsgp = 1; + auth->our_keyid = 0; + auth->authstate = OTRL_AUTHSTATE_NONE; + + break; case OTRL_AUTHSTATE_NONE: case OTRL_AUTHSTATE_AWAITING_DHKEY: case OTRL_AUTHSTATE_AWAITING_SIG: case OTRL_AUTHSTATE_V1_SETUP: - /* Ignore this message */ - *havemsgp = 0; - free(buf); - buf = NULL; - break; - } + /* Ignore this message */ + *havemsgp = 0; + free(buf); + buf = NULL; + break; + } - return err; + return err; decfail: - err = gcry_error(GPG_ERR_NO_ERROR); - goto err; + err = gcry_error(GPG_ERR_NO_ERROR); + goto err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(gxbuf); - gcry_cipher_close(enc); - gcry_mpi_release(incoming_pub); - return err; + free(buf); + free(gxbuf); + gcry_cipher_close(enc); + gcry_mpi_release(incoming_pub); + return err; } /* @@ -968,92 +1083,101 @@ gcry_error_t otrl_auth_handle_signature(OtrlAuthInfo *auth, gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), void *asdata) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp = NULL; - unsigned char *authstart, *authend, *macstart; - size_t buflen, lenp, authlen; - int res; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp = NULL; + unsigned char *authstart, *authend, *macstart; + size_t buflen, lenp, authlen; + int res; + unsigned char version; - *havemsgp = 0; + *havemsgp = 0; + + res = otrl_base64_otr_decode(sigmsg, &buf, &buflen); + if (res == -1) goto memerr; + if (res == -2) goto invval; + + bufp = buf; + lenp = buflen; - res = otrl_base64_otr_decode(sigmsg, &buf, &buflen); - if (res == -1) goto memerr; - if (res == -2) goto invval; + require_len(3); + version = bufp[1]; - bufp = buf; - lenp = buflen; + /* Header */ + skip_header('\x12'); - /* Header */ - if (memcmp(bufp, "\x00\x02\x12", 3)) goto invval; - bufp += 3; lenp -= 3; + if (version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } - /* auth */ - authstart = bufp; - read_int(authlen); - require_len(authlen); - bufp += authlen; lenp -= authlen; - authend = bufp; + /* auth */ + authstart = bufp; + read_int(authlen); + require_len(authlen); + bufp += authlen; lenp -= authlen; + authend = bufp; - /* MAC */ - require_len(20); - macstart = bufp; - bufp += 20; lenp -= 20; + /* MAC */ + require_len(20); + macstart = bufp; + bufp += 20; lenp -= 20; - if (lenp != 0) goto invval; + if (lenp != 0) goto invval; - switch(auth->authstate) { + switch(auth->authstate) { case OTRL_AUTHSTATE_AWAITING_SIG: - /* Check the MAC */ - gcry_md_reset(auth->mac_m2p); - gcry_md_write(auth->mac_m2p, authstart, authend - authstart); - if (memcmp(macstart, + /* Check the MAC */ + gcry_md_reset(auth->mac_m2p); + gcry_md_write(auth->mac_m2p, authstart, authend - authstart); + if (otrl_mem_differ(macstart, gcry_md_read(auth->mac_m2p, GCRY_MD_SHA256), 20)) goto invval; - /* Check the auth */ - err = check_pubkey_auth(auth->their_fingerprint, - &(auth->their_keyid), authstart + 4, - authend - authstart - 4, auth->mac_m1p, auth->enc_cp, - auth->our_dh.pub, auth->their_pub); - if (err) goto err; - - authstart = NULL; - authend = NULL; - macstart = NULL; - free(buf); - buf = NULL; - - /* No error? Then we've completed our end of the - * authentication. */ - auth->protocol_version = 2; - auth->session_id_half = OTRL_SESSIONID_FIRST_HALF_BOLD; - if (auth_succeeded) err = auth_succeeded(auth, asdata); - free(auth->lastauthmsg); - auth->lastauthmsg = NULL; - *havemsgp = 1; - auth->our_keyid = 0; - auth->authstate = OTRL_AUTHSTATE_NONE; - - break; + /* Check the auth */ + err = check_pubkey_auth(auth->their_fingerprint, + &(auth->their_keyid), authstart + 4, + authend - authstart - 4, auth->mac_m1p, auth->enc_cp, + auth->our_dh.pub, auth->their_pub); + if (err) goto err; + + authstart = NULL; + authend = NULL; + macstart = NULL; + free(buf); + buf = NULL; + + /* No error? Then we've completed our end of the + * authentication. */ + auth->session_id_half = OTRL_SESSIONID_FIRST_HALF_BOLD; + if (auth_succeeded) err = auth_succeeded(auth, asdata); + free(auth->lastauthmsg); + auth->lastauthmsg = NULL; + *havemsgp = 0; + auth->our_keyid = 0; + auth->authstate = OTRL_AUTHSTATE_NONE; + + break; case OTRL_AUTHSTATE_NONE: case OTRL_AUTHSTATE_AWAITING_DHKEY: case OTRL_AUTHSTATE_AWAITING_REVEALSIG: case OTRL_AUTHSTATE_V1_SETUP: - /* Ignore this message */ - *havemsgp = 0; - break; - } + /* Ignore this message */ + *havemsgp = 0; + free(buf); + buf = NULL; + break; + } - return err; + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - return err; + free(buf); + return err; } /* Version 1 routines, for compatibility */ @@ -1066,75 +1190,75 @@ err: static gcry_error_t create_v1_key_exchange_message(OtrlAuthInfo *auth, unsigned char reply, OtrlPrivKey *privkey) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - unsigned char *buf = NULL, *bufp = NULL, *sigbuf = NULL; - size_t lenp, ourpublen, totallen, siglen; - unsigned char hashbuf[20]; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + unsigned char *buf = NULL, *bufp = NULL, *sigbuf = NULL; + size_t lenp, ourpublen, totallen, siglen; + unsigned char hashbuf[20]; - if (privkey->pubkey_type != OTRL_PUBKEY_TYPE_DSA) { + if (privkey->pubkey_type != OTRL_PUBKEY_TYPE_DSA) { return gpg_error(GPG_ERR_INV_VALUE); - } + } - /* How big is the DH public key? */ - gcry_mpi_print(format, NULL, 0, &ourpublen, auth->our_dh.pub); + /* How big is the DH public key? */ + gcry_mpi_print(format, NULL, 0, &ourpublen, auth->our_dh.pub); - totallen = 3 + 1 + privkey->pubkey_datalen + 4 + 4 + ourpublen + 40; - buf = malloc(totallen); - if (buf == NULL) goto memerr; + totallen = 3 + 1 + privkey->pubkey_datalen + 4 + 4 + ourpublen + 40; + buf = malloc(totallen); + if (buf == NULL) goto memerr; - bufp = buf; - lenp = totallen; + bufp = buf; + lenp = totallen; - memcpy(bufp, "\x00\x01\x0a", 3); /* header */ - debug_data("Header", bufp, 3); - bufp += 3; lenp -= 3; + memmove(bufp, "\x00\x01\x0a", 3); /* header */ + debug_data("Header", bufp, 3); + bufp += 3; lenp -= 3; - bufp[0] = reply; - debug_data("Reply", bufp, 1); - bufp += 1; lenp -= 1; + bufp[0] = reply; + debug_data("Reply", bufp, 1); + bufp += 1; lenp -= 1; - memcpy(bufp, privkey->pubkey_data, privkey->pubkey_datalen); - debug_data("Pubkey", bufp, privkey->pubkey_datalen); - bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; + memmove(bufp, privkey->pubkey_data, privkey->pubkey_datalen); + debug_data("Pubkey", bufp, privkey->pubkey_datalen); + bufp += privkey->pubkey_datalen; lenp -= privkey->pubkey_datalen; - write_int(auth->our_keyid); - debug_int("Keyid", bufp-4); + write_int(auth->our_keyid); + debug_int("Keyid", bufp-4); - write_mpi(auth->our_dh.pub, ourpublen, "D-H y"); + write_mpi(auth->our_dh.pub, ourpublen, "D-H y"); - /* Hash all the data written so far, and sign the hash */ - gcry_md_hash_buffer(GCRY_MD_SHA1, hashbuf, buf, bufp - buf); + /* Hash all the data written so far, and sign the hash */ + gcry_md_hash_buffer(GCRY_MD_SHA1, hashbuf, buf, bufp - buf); - err = otrl_privkey_sign(&sigbuf, &siglen, privkey, hashbuf, 20); - if (err) goto err; + err = otrl_privkey_sign(&sigbuf, &siglen, privkey, hashbuf, 20); + if (err) goto err; - if (siglen != 40) goto invval; - memcpy(bufp, sigbuf, 40); - debug_data("Signature", bufp, 40); - bufp += 40; lenp -= 40; - free(sigbuf); - sigbuf = NULL; + if (siglen != 40) goto invval; + memmove(bufp, sigbuf, 40); + debug_data("Signature", bufp, 40); + bufp += 40; lenp -= 40; + free(sigbuf); + sigbuf = NULL; - assert(lenp == 0); + assert(lenp == 0); - free(auth->lastauthmsg); - auth->lastauthmsg = otrl_base64_otr_encode(buf, totallen); - if (auth->lastauthmsg == NULL) goto memerr; - free(buf); - buf = NULL; + free(auth->lastauthmsg); + auth->lastauthmsg = otrl_base64_otr_encode(buf, totallen); + if (auth->lastauthmsg == NULL) goto memerr; + free(buf); + buf = NULL; - return err; + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - free(sigbuf); - return err; + free(buf); + free(sigbuf); + return err; } /* @@ -1147,27 +1271,28 @@ err: gcry_error_t otrl_auth_start_v1(OtrlAuthInfo *auth, DH_keypair *our_dh, unsigned int our_keyid, OtrlPrivKey *privkey) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - /* Clear out this OtrlAuthInfo and start over */ - otrl_auth_clear(auth); - auth->initiated = 1; + /* Clear out this OtrlAuthInfo and start over */ + otrl_auth_clear(auth); + auth->initiated = 1; + auth->protocol_version = 1; - /* Import the given DH keypair, or else create a fresh one */ - if (our_dh) { + /* Import the given DH keypair, or else create a fresh one */ + if (our_dh) { otrl_dh_keypair_copy(&(auth->our_dh), our_dh); auth->our_keyid = our_keyid; - } else { + } else { otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); auth->our_keyid = 1; - } + } - err = create_v1_key_exchange_message(auth, 0, privkey); - if (!err) { + err = create_v1_key_exchange_message(auth, 0, privkey); + if (!err) { auth->authstate = OTRL_AUTHSTATE_V1_SETUP; - } + } - return err; + return err; } /* @@ -1184,230 +1309,265 @@ gcry_error_t otrl_auth_handle_v1_key_exchange(OtrlAuthInfo *auth, gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), void *asdata) { - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - unsigned char *buf = NULL, *bufp = NULL; - unsigned char *fingerprintstart, *fingerprintend; - unsigned char fingerprintbuf[20], hashbuf[20]; - gcry_mpi_t p, q, g, y, received_pub = NULL; - gcry_sexp_t pubs = NULL; - size_t buflen, lenp; - unsigned char received_reply; - unsigned int received_keyid; - int res; - - *havemsgp = 0; - - res = otrl_base64_otr_decode(keyexchmsg, &buf, &buflen); - if (res == -1) goto memerr; - if (res == -2) goto invval; - - bufp = buf; - lenp = buflen; - - /* Header */ - require_len(3); - if (memcmp(bufp, "\x00\x01\x0a", 3)) goto invval; - bufp += 3; lenp -= 3; - - /* Reply */ - require_len(1); - received_reply = bufp[0]; - bufp += 1; lenp -= 1; - - /* Public Key */ - fingerprintstart = bufp; - read_mpi(p); - read_mpi(q); - read_mpi(g); - read_mpi(y); - fingerprintend = bufp; - gcry_md_hash_buffer(GCRY_MD_SHA1, fingerprintbuf, - fingerprintstart, fingerprintend-fingerprintstart); - gcry_sexp_build(&pubs, NULL, + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + unsigned char *buf = NULL, *bufp = NULL; + unsigned char *fingerprintstart, *fingerprintend; + unsigned char fingerprintbuf[20], hashbuf[20]; + gcry_mpi_t p, q, g, y, received_pub = NULL; + gcry_sexp_t pubs = NULL; + size_t buflen, lenp; + unsigned char received_reply; + unsigned int received_keyid; + int res; + + *havemsgp = 0; + + res = otrl_base64_otr_decode(keyexchmsg, &buf, &buflen); + if (res == -1) goto memerr; + if (res == -2) goto invval; + + bufp = buf; + lenp = buflen; + + /* Header */ + require_len(3); + if (memcmp(bufp, "\x00\x01\x0a", 3)) goto invval; + bufp += 3; lenp -= 3; + + /* Reply */ + require_len(1); + received_reply = bufp[0]; + bufp += 1; lenp -= 1; + + /* Public Key */ + fingerprintstart = bufp; + read_mpi(p); + read_mpi(q); + read_mpi(g); + read_mpi(y); + fingerprintend = bufp; + gcry_md_hash_buffer(GCRY_MD_SHA1, fingerprintbuf, + fingerprintstart, fingerprintend-fingerprintstart); + gcry_sexp_build(&pubs, NULL, "(public-key (dsa (p %m)(q %m)(g %m)(y %m)))", p, q, g, y); - gcry_mpi_release(p); - gcry_mpi_release(q); - gcry_mpi_release(g); - gcry_mpi_release(y); - - /* keyid */ - read_int(received_keyid); - if (received_keyid == 0) goto invval; - - /* D-H pubkey */ - read_mpi(received_pub); - - /* Verify the signature */ - if (lenp != 40) goto invval; - gcry_md_hash_buffer(GCRY_MD_SHA1, hashbuf, buf, bufp - buf); - err = otrl_privkey_verify(bufp, lenp, OTRL_PUBKEY_TYPE_DSA, - pubs, hashbuf, 20); - if (err) goto err; - gcry_sexp_release(pubs); - pubs = NULL; - free(buf); - buf = NULL; - - if (auth->authstate != OTRL_AUTHSTATE_V1_SETUP && received_reply == 0x01) { + gcry_mpi_release(p); + gcry_mpi_release(q); + gcry_mpi_release(g); + gcry_mpi_release(y); + + /* keyid */ + read_int(received_keyid); + if (received_keyid == 0) goto invval; + + /* D-H pubkey */ + read_mpi(received_pub); + + /* Verify the signature */ + if (lenp != 40) goto invval; + gcry_md_hash_buffer(GCRY_MD_SHA1, hashbuf, buf, bufp - buf); + err = otrl_privkey_verify(bufp, lenp, OTRL_PUBKEY_TYPE_DSA, + pubs, hashbuf, 20); + if (err) goto err; + gcry_sexp_release(pubs); + pubs = NULL; + free(buf); + buf = NULL; + + if (auth->authstate != OTRL_AUTHSTATE_V1_SETUP && received_reply == 0x01) { /* They're replying to something we never sent. We must be * logged in more than once; ignore the message. */ err = gpg_error(GPG_ERR_NO_ERROR); goto err; - } + } - if (auth->authstate != OTRL_AUTHSTATE_V1_SETUP) { + if (auth->authstate != OTRL_AUTHSTATE_V1_SETUP) { /* Clear the auth and start over */ otrl_auth_clear(auth); - } + } - /* Everything checked out */ - auth->their_keyid = received_keyid; - gcry_mpi_release(auth->their_pub); - auth->their_pub = received_pub; - received_pub = NULL; - memcpy(auth->their_fingerprint, fingerprintbuf, 20); + /* Everything checked out */ + auth->their_keyid = received_keyid; + gcry_mpi_release(auth->their_pub); + auth->their_pub = received_pub; + received_pub = NULL; + memmove(auth->their_fingerprint, fingerprintbuf, 20); - if (received_reply == 0x01) { + if (received_reply == 0x01) { /* Don't send a reply to this. */ *havemsgp = 0; - } else { + } else { /* Import the given DH keypair, or else create a fresh one */ if (our_dh) { - otrl_dh_keypair_copy(&(auth->our_dh), our_dh); - auth->our_keyid = our_keyid; + otrl_dh_keypair_copy(&(auth->our_dh), our_dh); + auth->our_keyid = our_keyid; } else if (auth->our_keyid == 0) { - otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); - auth->our_keyid = 1; + otrl_dh_gen_keypair(DH1536_GROUP_ID, &(auth->our_dh)); + auth->our_keyid = 1; } /* Reply with our own Key Exchange Message */ err = create_v1_key_exchange_message(auth, 1, privkey); if (err) goto err; *havemsgp = 1; - } + } - /* Compute the session id */ - err = otrl_dh_compute_v1_session_id(&(auth->our_dh), - auth->their_pub, auth->secure_session_id, - &(auth->secure_session_id_len), - &(auth->session_id_half)); - if (err) goto err; + /* Compute the session id */ + err = otrl_dh_compute_v1_session_id(&(auth->our_dh), + auth->their_pub, auth->secure_session_id, + &(auth->secure_session_id_len), + &(auth->session_id_half)); + if (err) goto err; - /* We've completed our end of the authentication */ - auth->protocol_version = 1; - if (auth_succeeded) err = auth_succeeded(auth, asdata); - auth->our_keyid = 0; - auth->authstate = OTRL_AUTHSTATE_NONE; + /* We've completed our end of the authentication */ + auth->protocol_version = 1; + if (auth_succeeded) err = auth_succeeded(auth, asdata); + auth->our_keyid = 0; + auth->authstate = OTRL_AUTHSTATE_NONE; - return err; + return err; invval: - err = gcry_error(GPG_ERR_INV_VALUE); - goto err; + err = gcry_error(GPG_ERR_INV_VALUE); + goto err; memerr: - err = gcry_error(GPG_ERR_ENOMEM); + err = gcry_error(GPG_ERR_ENOMEM); err: - free(buf); - gcry_sexp_release(pubs); - gcry_mpi_release(received_pub); - return err; + free(buf); + gcry_sexp_release(pubs); + gcry_mpi_release(received_pub); + return err; +} + +/* + * Copy relevant information from the master OtrlAuthInfo to an + * instance OtrlAuthInfo in response to a D-H Key with a new + * instance. The fields copied will depend on the state of the + * master auth. + */ +void otrl_auth_copy_on_key(OtrlAuthInfo *m_auth, OtrlAuthInfo *auth) +{ + switch(m_auth->authstate) { + case OTRL_AUTHSTATE_AWAITING_DHKEY: + case OTRL_AUTHSTATE_AWAITING_SIG: + /* Copy our D-H Commit information to the new instance */ + otrl_dh_keypair_free(&(auth->our_dh)); + auth->initiated = m_auth->initiated; + otrl_dh_keypair_copy(&(auth->our_dh), &(m_auth->our_dh)); + auth->our_keyid = m_auth->our_keyid; + memmove(auth->r, m_auth->r, 16); + if (auth->encgx) free(auth->encgx); + auth->encgx = malloc(m_auth->encgx_len); + memmove(auth->encgx, m_auth->encgx, m_auth->encgx_len); + memmove(auth->hashgx, m_auth->hashgx, 32); + + auth->authstate = OTRL_AUTHSTATE_AWAITING_DHKEY; + break; + + default: + /* This bad state will be detected and handled later */ + break; + } } #ifdef OTRL_TESTING_AUTH #include "mem.h" #include "privkey.h" -#define CHECK_ERR if (err) { printf("Error: %s\n", gcry_strerror(err)); return 1; } +#define CHECK_ERR if (err) { printf("Error: %s\n", gcry_strerror(err)); \ + return 1; } static gcry_error_t starting(const OtrlAuthInfo *auth, void *asdata) { - char *name = asdata; + char *name = asdata; - fprintf(stderr, "\nStarting ENCRYPTED mode for %s (v%d).\n", name, auth->protocol_version); + fprintf(stderr, "\nStarting ENCRYPTED mode for %s (v%d).\n", + name, auth->protocol_version); - fprintf(stderr, "\nour_dh (%d):", auth->our_keyid); - gcry_mpi_dump(auth->our_dh.pub); - fprintf(stderr, "\ntheir_pub (%d):", auth->their_keyid); - gcry_mpi_dump(auth->their_pub); + fprintf(stderr, "\nour_dh (%d):", auth->our_keyid); + gcry_mpi_dump(auth->our_dh.pub); + fprintf(stderr, "\ntheir_pub (%d):", auth->their_keyid); + gcry_mpi_dump(auth->their_pub); - debug_data("\nTheir fingerprint", auth->their_fingerprint, 20); - debug_data("\nSecure session id", auth->secure_session_id, - auth->secure_session_id_len); - fprintf(stderr, "Sessionid half: %d\n\n", auth->session_id_half); + debug_data("\nTheir fingerprint", auth->their_fingerprint, 20); + debug_data("\nSecure session id", auth->secure_session_id, + auth->secure_session_id_len); + fprintf(stderr, "Sessionid half: %d\n\n", auth->session_id_half); - return gpg_error(GPG_ERR_NO_ERROR); + return gpg_error(GPG_ERR_NO_ERROR); } int main(int argc, char **argv) { - OtrlAuthInfo alice, bob; - gcry_error_t err; - int havemsg; - OtrlUserState us; - OtrlPrivKey *alicepriv, *bobpriv; - - otrl_mem_init(); - otrl_dh_init(); - otrl_auth_new(&alice); - otrl_auth_new(&bob); - - us = otrl_userstate_create(); - otrl_privkey_read(us, "/home/iang/.gaim/otr.private_key"); - alicepriv = otrl_privkey_find(us, "oneeyedian", "prpl-oscar"); - bobpriv = otrl_privkey_find(us, "otr4ian", "prpl-oscar"); - - printf("\n\n ***** V2 *****\n\n"); - - err = otrl_auth_start_v2(&bob, NULL, 0); - CHECK_ERR - printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); - err = otrl_auth_handle_commit(&alice, bob.lastauthmsg, NULL, 0); - CHECK_ERR - printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), alice.lastauthmsg); - err = otrl_auth_handle_key(&bob, alice.lastauthmsg, &havemsg, bobpriv); - CHECK_ERR - if (havemsg) { + OtrlAuthInfo alice, bob; + gcry_error_t err; + int havemsg; + OtrlUserState us; + OtrlPrivKey *alicepriv, *bobpriv; + + otrl_mem_init(); + otrl_dh_init(); + otrl_auth_new(&alice); + otrl_auth_new(&bob); + + us = otrl_userstate_create(); + otrl_privkey_read(us, "/home/iang/.gaim/otr.private_key"); + alicepriv = otrl_privkey_find(us, "oneeyedian", "prpl-oscar"); + bobpriv = otrl_privkey_find(us, "otr4ian", "prpl-oscar"); + + printf("\n\n ***** V2 *****\n\n"); + + err = otrl_auth_start_v23(&bob, NULL, 0); + CHECK_ERR + printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); + err = otrl_auth_handle_commit(&alice, bob.lastauthmsg, NULL, 0); + CHECK_ERR + printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), alice.lastauthmsg); + err = otrl_auth_handle_key(&bob, alice.lastauthmsg, &havemsg, bobpriv); + CHECK_ERR + if (havemsg) { printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); - } else { + } else { printf("\nIGNORE\n\n"); - } - err = otrl_auth_handle_revealsig(&alice, bob.lastauthmsg, &havemsg, - alicepriv, starting, "Alice"); - CHECK_ERR - if (havemsg) { - printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), alice.lastauthmsg); - } else { + } + err = otrl_auth_handle_revealsig(&alice, bob.lastauthmsg, &havemsg, + alicepriv, starting, "Alice"); + CHECK_ERR + if (havemsg) { + printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), + alice.lastauthmsg); + } else { printf("\nIGNORE\n\n"); - } - err = otrl_auth_handle_signature(&bob, alice.lastauthmsg, &havemsg, - starting, "Bob"); - CHECK_ERR - - printf("\n\n ***** V1 *****\n\n"); - - err = otrl_auth_start_v1(&bob, NULL, 0, bobpriv); - CHECK_ERR - printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); - err = otrl_auth_handle_v1_key_exchange(&alice, bob.lastauthmsg, - &havemsg, alicepriv, NULL, 0, starting, "Alice"); - CHECK_ERR - if (havemsg) { - printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), alice.lastauthmsg); - } else { + } + err = otrl_auth_handle_signature(&bob, alice.lastauthmsg, &havemsg, + starting, "Bob"); + CHECK_ERR + + printf("\n\n ***** V1 *****\n\n"); + + err = otrl_auth_start_v1(&bob, NULL, 0, bobpriv); + CHECK_ERR + printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); + err = otrl_auth_handle_v1_key_exchange(&alice, bob.lastauthmsg, + &havemsg, alicepriv, NULL, 0, starting, "Alice"); + CHECK_ERR + if (havemsg) { + printf("\nAlice: %d\n%s\n\n", strlen(alice.lastauthmsg), + alice.lastauthmsg); + } else { printf("\nIGNORE\n\n"); - } - err = otrl_auth_handle_v1_key_exchange(&bob, alice.lastauthmsg, - &havemsg, bobpriv, NULL, 0, starting, "Bob"); - CHECK_ERR - if (havemsg) { + } + err = otrl_auth_handle_v1_key_exchange(&bob, alice.lastauthmsg, + &havemsg, bobpriv, NULL, 0, starting, "Bob"); + CHECK_ERR + if (havemsg) { printf("\nBob: %d\n%s\n\n", strlen(bob.lastauthmsg), bob.lastauthmsg); - } else { + } else { printf("\nIGNORE\n\n"); - } + } - otrl_userstate_free(us); - otrl_auth_clear(&alice); - otrl_auth_clear(&bob); - return 0; + otrl_userstate_free(us); + otrl_auth_clear(&alice); + otrl_auth_clear(&bob); + return 0; } #endif diff --git a/plugins/MirOTR/libotr/src/auth.h b/plugins/MirOTR/libotr/src/auth.h index ac9c668d94..0b9db544aa 100644 --- a/plugins/MirOTR/libotr/src/auth.h +++ b/plugins/MirOTR/libotr/src/auth.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,62 +15,73 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __AUTH_H__ #define __AUTH_H__ #include <gcrypt.h> +#include <time.h> #include "dh.h" + typedef enum { - OTRL_AUTHSTATE_NONE, - OTRL_AUTHSTATE_AWAITING_DHKEY, - OTRL_AUTHSTATE_AWAITING_REVEALSIG, - OTRL_AUTHSTATE_AWAITING_SIG, - OTRL_AUTHSTATE_V1_SETUP + OTRL_AUTHSTATE_NONE, + OTRL_AUTHSTATE_AWAITING_DHKEY, + OTRL_AUTHSTATE_AWAITING_REVEALSIG, + OTRL_AUTHSTATE_AWAITING_SIG, + OTRL_AUTHSTATE_V1_SETUP } OtrlAuthState; typedef struct { - OtrlAuthState authstate; /* Our state */ + OtrlAuthState authstate; /* Our state */ + + struct context *context; /* The context which points to us */ + + DH_keypair our_dh; /* Our D-H key */ + unsigned int our_keyid; /* ...and its keyid */ + + unsigned char *encgx; /* The encrypted value of g^x */ + size_t encgx_len; /* ...and its length */ + unsigned char r[16]; /* The encryption key */ - DH_keypair our_dh; /* Our D-H key */ - unsigned int our_keyid; /* ...and its keyid */ + unsigned char hashgx[32]; /* SHA256(g^x) */ - unsigned char *encgx; /* The encrypted value of g^x */ - size_t encgx_len; /* ...and its length */ - unsigned char r[16]; /* The encryption key */ + gcry_mpi_t their_pub; /* Their D-H public key */ + unsigned int their_keyid; /* ...and its keyid */ - unsigned char hashgx[32]; /* SHA256(g^x) */ - gcry_mpi_t their_pub; /* Their D-H public key */ - unsigned int their_keyid; /* ...and its keyid */ + gcry_cipher_hd_t enc_c, enc_cp; /* c and c' encryption keys */ + gcry_md_hd_t mac_m1, mac_m1p; /* m1 and m1' MAC keys */ + gcry_md_hd_t mac_m2, mac_m2p; /* m2 and m2' MAC keys */ - gcry_cipher_hd_t enc_c, enc_cp; /* c and c' encryption keys */ - gcry_md_hd_t mac_m1, mac_m1p; /* m1 and m1' MAC keys */ - gcry_md_hd_t mac_m2, mac_m2p; /* m2 and m2' MAC keys */ + unsigned char their_fingerprint[20]; /* The fingerprint of their + long-term signing key */ - unsigned char their_fingerprint[20]; /* The fingerprint of their - long-term signing key */ + int initiated; /* Did we initiate this + authentication? */ - int initiated; /* Did we initiate this - authentication? */ + unsigned int protocol_version; /* The protocol version number + used to authenticate. */ - unsigned int protocol_version; /* The protocol version number - used to authenticate. */ + unsigned char secure_session_id[20]; /* The secure session id */ + size_t secure_session_id_len; /* And its actual length, + which may be either 20 (for + v1) or 8 (for v2) */ + OtrlSessionIdHalf session_id_half; /* Which half of the session + id gets shown in bold */ - unsigned char secure_session_id[20]; /* The secure session id */ - size_t secure_session_id_len; /* And its actual length, - which may be either 20 (for - v1) or 8 (for v2) */ - OtrlSessionIdHalf session_id_half; /* Which half of the session - id gets shown in bold */ + char *lastauthmsg; /* The last auth message + (base-64 encoded) we sent, + in case we need to + retransmit it. */ - char *lastauthmsg; /* The last auth message - (base-64 encoded) we sent, - in case we need to - retransmit it. */ + time_t commit_sent_time; /* The time we last sent the + lastauthmsg, if it was a + COMMIT message, and this is + a master context. 0 + otherwise. */ } OtrlAuthInfo; #include "privkey-t.h" @@ -77,7 +89,7 @@ typedef struct { /* * Initialize the fields of an OtrlAuthInfo (already allocated). */ -void otrl_auth_new(OtrlAuthInfo *auth); +void otrl_auth_new(struct context *context); /* * Clear the fields of an OtrlAuthInfo (but leave it allocated). @@ -85,11 +97,11 @@ void otrl_auth_new(OtrlAuthInfo *auth); void otrl_auth_clear(OtrlAuthInfo *auth); /* - * Start a fresh AKE (version 2) using the given OtrlAuthInfo. Generate + * Start a fresh AKE (version 2 or 3) using the given OtrlAuthInfo. Generate * a fresh DH keypair to use. If no error is returned, the message to * transmit will be contained in auth->lastauthmsg. */ -gcry_error_t otrl_auth_start_v2(OtrlAuthInfo *auth); +gcry_error_t otrl_auth_start_v23(OtrlAuthInfo *auth, int version); /* * Handle an incoming D-H Commit Message. If no error is returned, the @@ -97,7 +109,7 @@ gcry_error_t otrl_auth_start_v2(OtrlAuthInfo *auth); * keypair to use. */ gcry_error_t otrl_auth_handle_commit(OtrlAuthInfo *auth, - const char *commitmsg); + const char *commitmsg, int version); /* * Handle an incoming D-H Key Message. If no error is returned, and @@ -154,4 +166,12 @@ gcry_error_t otrl_auth_handle_v1_key_exchange(OtrlAuthInfo *auth, gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata), void *asdata); +/* + * Copy relevant information from the master OtrlAuthInfo to an + * instance OtrlAuthInfo in response to a D-H Key with a new + * instance. The fields copied will depend on the state of the + * master auth. + */ +void otrl_auth_copy_on_key(OtrlAuthInfo *m_auth, OtrlAuthInfo *auth); + #endif diff --git a/plugins/MirOTR/libotr/src/b64.c b/plugins/MirOTR/libotr/src/b64.c index 222f56634c..a7d53aa2b1 100644 --- a/plugins/MirOTR/libotr/src/b64.c +++ b/plugins/MirOTR/libotr/src/b64.c @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* Modified from: */ @@ -27,35 +28,35 @@ AUTHOR: Bob Trower 08/04/01 LICENCE: Copyright (c) 2001 Bob Trower, Trantor Standard Systems Inc. - Permission is hereby granted, free of charge, to any person - obtaining a copy of this software and associated - documentation files (the "Software"), to deal in the - Software without restriction, including without limitation - the rights to use, copy, modify, merge, publish, distribute, - sublicense, and/or sell copies of the Software, and to - permit persons to whom the Software is furnished to do so, - subject to the following conditions: - - The above copyright notice and this permission notice shall - be included in all copies or substantial portions of the - Software. - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY - KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE - WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR - PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS - OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR - OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR - OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE - SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + Permission is hereby granted, free of charge, to any person + obtaining a copy of this software and associated + documentation files (the "Software"), to deal in the + Software without restriction, including without limitation + the rights to use, copy, modify, merge, publish, distribute, + sublicense, and/or sell copies of the Software, and to + permit persons to whom the Software is furnished to do so, + subject to the following conditions: + + The above copyright notice and this permission notice shall + be included in all copies or substantial portions of the + Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY + KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE + WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR + PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS + OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. VERSION HISTORY: - Bob Trower 08/04/01 -- Create Version 0.00.00B + Bob Trower 08/04/01 -- Create Version 0.00.00B \******************************************************************* */ /* system headers */ -#include <stdlib.h> +#include <stdio.h> #include <string.h> /* libotr headers */ @@ -87,9 +88,9 @@ static void encodeblock( char *out, const unsigned char *in, size_t len ) out[0] = cb64[ in0 >> 2 ]; out[1] = cb64[ ((in0 & 0x03) << 4) | ((in1 & 0xf0) >> 4) ]; out[2] = len > 1 ? cb64[ ((in1 & 0x0f) << 2) | ((in2 & 0xc0) >> 6) ] - : '='; + : '='; out[3] = len > 2 ? cb64[ in2 & 0x3f ] - : '='; + : '='; } /* @@ -119,7 +120,7 @@ size_t otrl_base64_encode(char *base64data, const unsigned char *data, } static size_t decode(unsigned char *out, const char *in, size_t b64len) -{ +{ size_t written = 0; unsigned char c = 0; @@ -147,8 +148,9 @@ static size_t decode(unsigned char *out, const char *in, size_t b64len) * base64 decode data. Skip non-base64 chars, and terminate at the * first '=', or the end of the buffer. * - * The buffer data must contain at least (base64len / 4) * 3 bytes of - * space. This function will return the number of bytes actually used. + * The buffer data must contain at least ((base64len+3) / 4) * 3 bytes + * of space. This function will return the number of bytes actually + * used. */ size_t otrl_base64_decode(unsigned char *data, const char *base64data, size_t base64len) @@ -195,6 +197,16 @@ char *otrl_base64_otr_encode(const unsigned char *buf, size_t buflen) { char *base64buf; size_t base64len; + const size_t HALF_MAX_SIZE_T = ((size_t)-1) >> 1; + + if (buflen > HALF_MAX_SIZE_T) { + /* You somehow have a buffer that's of size more than half of + * all addressable memory, and you now want a base64 version in + * a new buffer 33% larger? Not going to happen. Exit now, + * rather in the malloc below, to avoid integer overflowing the + * computation of base64len. */ + return NULL; + } /* Make the base64-encoding. */ base64len = ((buflen + 2) / 3) * 4; @@ -202,7 +214,7 @@ char *otrl_base64_otr_encode(const unsigned char *buf, size_t buflen) if (base64buf == NULL) { return NULL; } - memcpy(base64buf, "?OTR:", 5); + memmove(base64buf, "?OTR:", 5); otrl_base64_encode(base64buf+5, buf, buflen); base64buf[5 + base64len] = '.'; base64buf[5 + base64len + 1] = '\0'; @@ -227,20 +239,26 @@ int otrl_base64_otr_decode(const char *msg, unsigned char **bufp, if (!otrtag) { return -2; } + endtag = strchr(otrtag, '.'); if (endtag) { - msglen = endtag-otrtag; + msglen = endtag-otrtag; } else { return -2; } + /* Skip over the "?OTR:" */ + otrtag += 5; + msglen -= 5; + /* Base64-decode the message */ - rawlen = ((msglen-5) / 4) * 3; /* maximum possible */ + rawlen = OTRL_B64_MAX_DECODED_SIZE(msglen); /* maximum possible */ rawmsg = malloc(rawlen); if (!rawmsg && rawlen > 0) { return -1; } - rawlen = otrl_base64_decode(rawmsg, otrtag+5, msglen-5); /* actual size */ + + rawlen = otrl_base64_decode(rawmsg, otrtag, msglen); /* actual size */ *bufp = rawmsg; *lenp = rawlen; diff --git a/plugins/MirOTR/libotr/src/b64.h b/plugins/MirOTR/libotr/src/b64.h index 34ef03f416..bdd584a45e 100644 --- a/plugins/MirOTR/libotr/src/b64.h +++ b/plugins/MirOTR/libotr/src/b64.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,12 +15,25 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __B64_H__ #define __B64_H__ +#include <stdlib.h> + +/* Base64 encodes blocks of this many bytes: */ +#define OTRL_B64_DECODED_LEN 3 +/* into blocks of this many bytes: */ +#define OTRL_B64_ENCODED_LEN 4 + +/* An encoded block of length encoded_len can turn into a maximum of + * this many decoded bytes: */ +#define OTRL_B64_MAX_DECODED_SIZE(encoded_len) \ + (((encoded_len + OTRL_B64_ENCODED_LEN - 1) / OTRL_B64_ENCODED_LEN) \ + * OTRL_B64_DECODED_LEN) + /* * base64 encode data. Insert no linebreaks or whitespace. * @@ -33,8 +47,9 @@ size_t otrl_base64_encode(char *base64data, const unsigned char *data, * base64 decode data. Skip non-base64 chars, and terminate at the * first '=', or the end of the buffer. * - * The buffer data must contain at least (base64len / 4) * 3 bytes of - * space. This function will return the number of bytes actually used. + * The buffer data must contain at least ((base64len+3) / 4) * 3 bytes + * of space. This function will return the number of bytes actually + * used. */ size_t otrl_base64_decode(unsigned char *data, const char *base64data, size_t base64len); diff --git a/plugins/MirOTR/libotr/src/context.c b/plugins/MirOTR/libotr/src/context.c index d0d912f76a..44d8b860f7 100644 --- a/plugins/MirOTR/libotr/src/context.c +++ b/plugins/MirOTR/libotr/src/context.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -26,117 +28,339 @@ /* libotr headers */ #include "context.h" +#include "instag.h" + +#if OTRL_DEBUGGING +#include <stdio.h> + +void otrl_auth_dump(FILE *f, const OtrlAuthInfo *auth); +void otrl_sm_dump(FILE *f, const OtrlSMState *sm); + +/* Dump the contents of a context to the FILE *f. */ +void otrl_context_dump(FILE *f, const ConnContext *context) +{ + const Fingerprint *fing; + + fprintf(f, "Context %p:\n\n", context); + + fprintf(f, " Username: %s\n", context->username); + fprintf(f, " Accountname: %s\n", context->accountname); + fprintf(f, " Protocol: %s\n\n", context->protocol); + fprintf(f, " Master context: %p%s\n", context->m_context, + context->m_context == context ? " IS MASTER" : ""); + fprintf(f, " Recent recv child: %p\n", context->recent_rcvd_child); + fprintf(f, " Recent sent child: %p\n", context->recent_sent_child); + fprintf(f, " Recent child: %p\n\n", context->recent_child); + fprintf(f, " Our instance: %08x\n", context->our_instance); + fprintf(f, " Their instance: %08x\n\n", context->their_instance); + fprintf(f, " Msgstate: %d (%s)\n\n", context->msgstate, + context->msgstate == OTRL_MSGSTATE_PLAINTEXT ? "PLAINTEXT" : + context->msgstate == OTRL_MSGSTATE_ENCRYPTED ? "ENCRYPTED" : + context->msgstate == OTRL_MSGSTATE_FINISHED ? "FINISHED" : + "INVALID"); + otrl_auth_dump(f, &context->auth); + fprintf(f, "\n Fingerprints:\n"); + for (fing = context->fingerprint_root.next; fing; fing = fing->next) { + fprintf(f, " %p ", fing); + if (fing->fingerprint == NULL) { + fprintf(f, "(null)"); + } else { + int i; + for (i=0;i<20;++i) { + fprintf(f, "%02x", fing->fingerprint[i]); + } + } + fprintf(f, " %p", fing->context); + if (fing->trust && fing->trust[0]) { + fprintf(f, " %s", fing->trust); + } + fprintf(f, "\n"); + } + fprintf(f, "\n Active fingerprint: %p\n\n", context->active_fingerprint); + fprintf(f, " Protocol version: %d\n", context->protocol_version); + fprintf(f, " OTR offer: %d (%s)\n\n", context->otr_offer, + context->otr_offer == OFFER_NOT ? "NOT" : + context->otr_offer == OFFER_SENT ? "SENT" : + context->otr_offer == OFFER_REJECTED ? "REJECTED" : + context->otr_offer == OFFER_ACCEPTED ? "ACCEPTED" : + "INVALID"); + + fprintf(f, " Application data: %p\n", context->app_data); + if (context->smstate == NULL) { + fprintf(f, " SM state: NULL\n"); + } else { + otrl_sm_dump(f, context->smstate); + } + fprintf(f, "\n"); +} + +/* Dump the master context of this context, and all of its children. */ +void otrl_context_siblings_dump(FILE *f, const ConnContext *context) +{ + const ConnContext *citer; + for (citer = context->m_context; + citer && citer->m_context == context->m_context; + citer = citer->next) { + if (citer == context) { + fprintf(f, "*** "); + } + otrl_context_dump(f, citer); + } +} + +/* Dump all contexts. */ +void otrl_context_all_dump(FILE *f, OtrlUserState us) +{ + const ConnContext *citer; + unsigned int ctxnum = 1; + for (citer = us->context_root; citer; citer = citer->next, ++ctxnum) { + fprintf(f, "%u. ", ctxnum); + otrl_context_dump(f, citer); + } +} +#endif /* Create a new connection context. */ static ConnContext * new_context(const char * user, const char * accountname, const char * protocol) { - ConnContext * context; - OtrlSMState *smstate; - context = malloc(sizeof(*context)); - assert(context != NULL); - context->username = _strdup(user); - context->accountname = _strdup(accountname); - context->protocol = _strdup(protocol); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - context->msgstate = OTRL_MSGSTATE_PLAINTEXT; - otrl_auth_new(&(context->auth)); - - smstate = malloc(sizeof(OtrlSMState)); - assert(smstate != NULL); - otrl_sm_state_new(smstate); - context->smstate = smstate; - - context->fingerprint_root.fingerprint = NULL; - context->fingerprint_root.context = context; - context->fingerprint_root.next = NULL; - context->fingerprint_root.tous = NULL; - context->active_fingerprint = NULL; - context->their_keyid = 0; - context->their_y = NULL; - context->their_old_y = NULL; - context->our_keyid = 0; - context->our_dh_key.groupid = 0; - context->our_dh_key.priv = NULL; - context->our_dh_key.pub = NULL; - context->our_old_dh_key.groupid = 0; - context->our_old_dh_key.priv = NULL; - context->our_old_dh_key.pub = NULL; - otrl_dh_session_blank(&(context->sesskeys[0][0])); - otrl_dh_session_blank(&(context->sesskeys[0][1])); - otrl_dh_session_blank(&(context->sesskeys[1][0])); - otrl_dh_session_blank(&(context->sesskeys[1][1])); - memset(context->sessionid, 0, 20); - context->sessionid_len = 0; - context->protocol_version = 0; - context->numsavedkeys = 0; - context->preshared_secret = NULL; - context->preshared_secret_len = 0; - context->saved_mac_keys = NULL; - context->generation = 0; - context->lastsent = 0; - context->lastmessage = NULL; - context->may_retransmit = 0; - context->otr_offer = OFFER_NOT; - context->app_data = NULL; - context->app_data_free = NULL; - context->next = NULL; - return context; + ConnContext * context; + OtrlSMState *smstate; + + context = malloc(sizeof(ConnContext)); + assert(context != NULL); + + context->username = strdup(user); + context->accountname = strdup(accountname); + context->protocol = strdup(protocol); + + context->msgstate = OTRL_MSGSTATE_PLAINTEXT; + otrl_auth_new(context); + + smstate = malloc(sizeof(OtrlSMState)); + assert(smstate != NULL); + otrl_sm_state_new(smstate); + context->smstate = smstate; + + context->our_instance = 0; + context->their_instance = OTRL_INSTAG_MASTER; + context->fingerprint_root.fingerprint = NULL; + context->fingerprint_root.context = context; + context->fingerprint_root.next = NULL; + context->fingerprint_root.tous = NULL; + context->active_fingerprint = NULL; + memset(context->sessionid, 0, 20); + context->sessionid_len = 0; + context->protocol_version = 0; + context->otr_offer = OFFER_NOT; + context->app_data = NULL; + context->app_data_free = NULL; + context->context_priv = otrl_context_priv_new(); + assert(context->context_priv != NULL); + context->next = NULL; + context->m_context = context; + context->recent_rcvd_child = NULL; + context->recent_sent_child = NULL; + context->recent_child = NULL; + + return context; } -ConnContext * otrl_context_new(const char * user, const char * accountname, - const char * protocol) +ConnContext * otrl_context_find_recent_instance(ConnContext * context, + otrl_instag_t recent_instag) { + ConnContext * m_context; + + if (!context) return NULL; + + m_context = context->m_context; + + if (!m_context) return NULL; + + switch(recent_instag) { + case OTRL_INSTAG_RECENT: + return m_context->recent_child; + case OTRL_INSTAG_RECENT_RECEIVED: + return m_context->recent_rcvd_child; + case OTRL_INSTAG_RECENT_SENT: + return m_context->recent_sent_child; + default: + return NULL; + } +} + +/* Find the instance of this context that has the best security level, + and for which we have most recently received a message from. Note that most + recent in this case is limited to a one-second resolution. */ +ConnContext * otrl_context_find_recent_secure_instance(ConnContext * context) { - return new_context(user, accountname, protocol); + ConnContext *curp; /* for iteration */ + ConnContext *m_context; /* master */ + ConnContext *cresult = context; /* best so far */ + + if (!context) { + return cresult; + } + + m_context = context->m_context; + + for (curp = m_context; curp && curp->m_context == m_context; + curp = curp->next) { + int msgstate_improved = 0; /* 0 == same, 1 == improved */ + int trust_improved = 0; /* (will immediately 'continue' if worse + * than) */ + + if (cresult->msgstate == curp->msgstate) { + msgstate_improved = 0; + } else if (curp->msgstate == OTRL_MSGSTATE_ENCRYPTED || + (cresult->msgstate == OTRL_MSGSTATE_PLAINTEXT && + curp->msgstate == OTRL_MSGSTATE_FINISHED)) { + msgstate_improved = 1; + } else { + continue; + } + + + if (otrl_context_is_fingerprint_trusted(cresult->active_fingerprint) == + otrl_context_is_fingerprint_trusted(curp->active_fingerprint)) { + + trust_improved = 0; + } else if + (otrl_context_is_fingerprint_trusted(curp->active_fingerprint)){ + + trust_improved = 1; + } else { + continue; + } + + if (msgstate_improved || trust_improved || + (!msgstate_improved && !trust_improved && + curp->context_priv->lastrecv >= + cresult->context_priv->lastrecv)) { + cresult = curp; + } + } + + return cresult; } -/* Look up a connection context by name/account/protocol from the given +/* Look up a connection context by name/account/protocol/instag from the given * OtrlUserState. If add_if_missing is true, allocate and return a new * context if one does not currently exist. In that event, call * add_app_data(data, context) so that app_data and app_data_free can be - * filled in by the application, and set *addedp to 1. */ + * filled in by the application, and set *addedp to 1. + * In the 'their_instance' field note that you can also specify a 'meta- + * instance' value such as OTRL_INSTAG_MASTER, OTRL_INSTAG_RECENT, + * OTRL_INSTAG_RECENT_RECEIVED and OTRL_INSTAG_RECENT_SENT. */ ConnContext * otrl_context_find(OtrlUserState us, const char *user, - const char *accountname, const char *protocol, int add_if_missing, - int *addedp, + const char *accountname, const char *protocol, + otrl_instag_t their_instance, int add_if_missing, int *addedp, void (*add_app_data)(void *data, ConnContext *context), void *data) { - ConnContext ** curp; - int usercmp = 1, acctcmp = 1, protocmp = 1; - if (addedp) *addedp = 0; - if (!user || !accountname || !protocol) return NULL; - for (curp = &(us->context_root); *curp; curp = &((*curp)->next)) { - if ((usercmp = strcmp((*curp)->username, user)) > 0 || + ConnContext ** curp; + int usercmp = 1, acctcmp = 1, protocmp = 1; + if (addedp) *addedp = 0; + if (!user || !accountname || !protocol) return NULL; + + for (curp = &(us->context_root); *curp; curp = &((*curp)->next)) { + if ((usercmp = strcmp((*curp)->username, user)) > 0 || (usercmp == 0 && - (acctcmp = strcmp((*curp)->accountname, accountname)) > 0) || + (acctcmp = strcmp((*curp)->accountname, accountname)) > 0) || (usercmp == 0 && acctcmp == 0 && - (protocmp = strcmp((*curp)->protocol, protocol)) >= 0)) - /* We're at the right place in the list. We've either found - * it, or gone too far. */ - break; + (protocmp = strcmp((*curp)->protocol, protocol)) > 0) || + (usercmp == 0 && acctcmp == 0 && protocmp == 0 + && (their_instance < OTRL_MIN_VALID_INSTAG || + ((*curp)->their_instance >= their_instance)))) + /* We're at the right place in the list. We've either found + * it, or gone too far. */ + break; + } + + if (usercmp == 0 && acctcmp == 0 && protocmp == 0 && *curp && + (their_instance < OTRL_MIN_VALID_INSTAG || + (their_instance == (*curp)->their_instance))) { + /* Found one! */ + if (their_instance >= OTRL_MIN_VALID_INSTAG || + their_instance == OTRL_INSTAG_MASTER) { + return *curp; } - if (usercmp == 0 && acctcmp == 0 && protocmp == 0) { - /* Found it! */ - return *curp; + + /* We need to go back and check more values in the context */ + switch(their_instance) { + case OTRL_INSTAG_BEST: + return otrl_context_find_recent_secure_instance(*curp); + case OTRL_INSTAG_RECENT: + case OTRL_INSTAG_RECENT_RECEIVED: + case OTRL_INSTAG_RECENT_SENT: + return otrl_context_find_recent_instance(*curp, their_instance); + default: + return NULL; } - if (add_if_missing) { + } + + if (add_if_missing) { ConnContext *newctx; + OtrlInsTag *our_instag = (OtrlInsTag *)otrl_instag_find(us, accountname, + protocol); + if (addedp) *addedp = 1; newctx = new_context(user, accountname, protocol); newctx->next = *curp; if (*curp) { - (*curp)->tous = &(newctx->next); + (*curp)->tous = &(newctx->next); } *curp = newctx; newctx->tous = curp; if (add_app_data) { - add_app_data(data, *curp); + add_app_data(data, *curp); } - return *curp; + + /* Initialize specified instance tags */ + if (our_instag) { + newctx->our_instance = our_instag->instag; } - return NULL; + + if (their_instance >= OTRL_MIN_VALID_INSTAG || + their_instance == OTRL_INSTAG_MASTER) { + newctx->their_instance = their_instance; + } + + if (their_instance >= OTRL_MIN_VALID_INSTAG) { + newctx->m_context = otrl_context_find(us, user, accountname, + protocol, OTRL_INSTAG_MASTER, 1, NULL, add_app_data, data); + } + + if (their_instance == OTRL_INSTAG_MASTER) { + /* if we're adding a master, there are no children, so the most + * recent context is the one we add. */ + newctx->recent_child = newctx; + newctx->recent_rcvd_child = newctx; + newctx->recent_sent_child = newctx; + } + + return *curp; + } + return NULL; +} + +/* Return true iff the given fingerprint is marked as trusted. */ +int otrl_context_is_fingerprint_trusted(Fingerprint *fprint) { + return fprint && fprint->trust && fprint->trust[0] != '\0'; +} + +/* This method gets called after sending or receiving a message, to + * update the master context's "recent context" pointers. */ +void otrl_context_update_recent_child(ConnContext *context, + unsigned int sent_msg) { + ConnContext *m_context = context->m_context; + + if (sent_msg) { + m_context->recent_sent_child = context; + } else { + m_context->recent_rcvd_child = context; + } + + m_context->recent_child = context; + } /* Find a fingerprint in a given context, perhaps adding it if not @@ -144,107 +368,70 @@ ConnContext * otrl_context_find(OtrlUserState us, const char *user, Fingerprint *otrl_context_find_fingerprint(ConnContext *context, unsigned char fingerprint[20], int add_if_missing, int *addedp) { - Fingerprint *f = context->fingerprint_root.next; - if (addedp) *addedp = 0; - while(f) { + Fingerprint *f; + if (addedp) *addedp = 0; + + if (!context || !context->m_context) return NULL; + + context = context->m_context; + + f = context->fingerprint_root.next; + while(f) { if (!memcmp(f->fingerprint, fingerprint, 20)) return f; f = f->next; - } - /* Didn't find it. */ - if (add_if_missing) { + } + + /* Didn't find it. */ + if (add_if_missing) { if (addedp) *addedp = 1; f = malloc(sizeof(*f)); assert(f != NULL); f->fingerprint = malloc(20); assert(f->fingerprint != NULL); - memcpy(f->fingerprint, fingerprint, 20); + memmove(f->fingerprint, fingerprint, 20); f->context = context; f->trust = NULL; f->next = context->fingerprint_root.next; if (f->next) { - f->next->tous = &(f->next); + f->next->tous = &(f->next); } context->fingerprint_root.next = f; f->tous = &(context->fingerprint_root.next); return f; - } - return NULL; + } + return NULL; } /* Set the trust level for a given fingerprint */ void otrl_context_set_trust(Fingerprint *fprint, const char *trust) { - if (fprint == NULL) return; - - free(fprint->trust); - fprint->trust = trust ? _strdup(trust) : NULL; -} + if (fprint == NULL) return; -/* Set the preshared secret for a given fingerprint. Note that this - * currently only stores the secret in the ConnContext structure, but - * doesn't yet do anything with it. */ -void otrl_context_set_preshared_secret(ConnContext *context, - const unsigned char *secret, size_t secret_len) -{ - free(context->preshared_secret); - context->preshared_secret = NULL; - context->preshared_secret_len = 0; - - if (secret_len) { - context->preshared_secret = malloc(secret_len); - if (context->preshared_secret) { - memcpy(context->preshared_secret, secret, secret_len); - context->preshared_secret_len = secret_len; - } - } + free(fprint->trust); + fprint->trust = trust ? strdup(trust) : NULL; } /* Force a context into the OTRL_MSGSTATE_FINISHED state. */ void otrl_context_force_finished(ConnContext *context) { - context->msgstate = OTRL_MSGSTATE_FINISHED; - otrl_auth_clear(&(context->auth)); - free(context->fragment); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - context->active_fingerprint = NULL; - context->their_keyid = 0; - gcry_mpi_release(context->their_y); - context->their_y = NULL; - gcry_mpi_release(context->their_old_y); - context->their_old_y = NULL; - context->our_keyid = 0; - otrl_dh_keypair_free(&(context->our_dh_key)); - otrl_dh_keypair_free(&(context->our_old_dh_key)); - otrl_dh_session_free(&(context->sesskeys[0][0])); - otrl_dh_session_free(&(context->sesskeys[0][1])); - otrl_dh_session_free(&(context->sesskeys[1][0])); - otrl_dh_session_free(&(context->sesskeys[1][1])); - memset(context->sessionid, 0, 20); - context->sessionid_len = 0; - free(context->preshared_secret); - context->preshared_secret = NULL; - context->preshared_secret_len = 0; - context->protocol_version = 0; - context->numsavedkeys = 0; - free(context->saved_mac_keys); - context->saved_mac_keys = NULL; - gcry_free(context->lastmessage); - context->lastmessage = NULL; - context->may_retransmit = 0; - otrl_sm_state_free(context->smstate); + context->msgstate = OTRL_MSGSTATE_FINISHED; + otrl_auth_clear(&(context->auth)); + context->active_fingerprint = NULL; + memset(context->sessionid, 0, 20); + context->sessionid_len = 0; + context->protocol_version = 0; + otrl_sm_state_free(context->smstate); + otrl_context_priv_force_finished(context->context_priv); } /* Force a context into the OTRL_MSGSTATE_PLAINTEXT state. */ void otrl_context_force_plaintext(ConnContext *context) { - /* First clean up everything we'd need to do for the FINISHED state */ - otrl_context_force_finished(context); + /* First clean up everything we'd need to do for the FINISHED state */ + otrl_context_force_finished(context); - /* And just set the state properly */ - context->msgstate = OTRL_MSGSTATE_PLAINTEXT; + /* And just set the state properly */ + context->msgstate = OTRL_MSGSTATE_PLAINTEXT; } /* Forget a fingerprint (so long as it's not the active one. If it's a @@ -255,76 +442,106 @@ void otrl_context_force_plaintext(ConnContext *context) void otrl_context_forget_fingerprint(Fingerprint *fprint, int and_maybe_context) { - ConnContext *context = fprint->context; - if (fprint == &(context->fingerprint_root)) { + ConnContext *context = fprint->context; + if (fprint == &(context->fingerprint_root)) { if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT && and_maybe_context) { - otrl_context_forget(context); + otrl_context_forget(context); } - } else { + } else { if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT || context->active_fingerprint != fprint) { - free(fprint->fingerprint); - free(fprint->trust); - *(fprint->tous) = fprint->next; - if (fprint->next) { + + free(fprint->fingerprint); + free(fprint->trust); + *(fprint->tous) = fprint->next; + if (fprint->next) { fprint->next->tous = fprint->tous; - } - free(fprint); - if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT && - context->fingerprint_root.next == NULL && - and_maybe_context) { + } + free(fprint); + if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT && + context->fingerprint_root.next == NULL && + and_maybe_context) { /* We just deleted the only fingerprint. Forget the * whole thing. */ otrl_context_forget(context); - } - } + } } + } } -/* Forget a whole context, so long as it's PLAINTEXT. */ -void otrl_context_forget(ConnContext *context) +/* Forget a whole context, so long as it's PLAINTEXT. If a context has child + * instances, don't remove this instance unless children are also all in + * PLAINTEXT state. In this case, the children will also be removed. + * Returns 0 on success, 1 on failure. */ +int otrl_context_forget(ConnContext *context) { - if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT) return; + if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT) return 1; - /* Just to be safe, force to plaintext. This also frees any - * extraneous data lying around. */ - otrl_context_force_plaintext(context); + if (context->their_instance == OTRL_INSTAG_MASTER) { + ConnContext *c_iter; - /* First free all the Fingerprints */ - while(context->fingerprint_root.next) { - otrl_context_forget_fingerprint(context->fingerprint_root.next, 0); + for (c_iter = context; c_iter && + c_iter->m_context == context->m_context; + c_iter = c_iter->next) { + if (c_iter->msgstate != OTRL_MSGSTATE_PLAINTEXT) return 1; } - /* Now free all the dynamic info here */ - free(context->username); - free(context->accountname); - free(context->protocol); - free(context->smstate); - context->username = NULL; - context->accountname = NULL; - context->protocol = NULL; - context->smstate = NULL; - - /* Free the application data, if it exists */ - if (context->app_data && context->app_data_free) { + + c_iter = context->next; + while (c_iter && c_iter->m_context == context->m_context) { + if (!otrl_context_forget(c_iter)) { + c_iter = context->next; + } else { + return 1; + } + } + + } + + /* Just to be safe, force to plaintext. This also frees any + * extraneous data lying around. */ + otrl_context_force_plaintext(context); + + /* First free all the Fingerprints */ + while(context->fingerprint_root.next) { + otrl_context_forget_fingerprint(context->fingerprint_root.next, 0); + } + /* Now free all the dynamic info here */ + free(context->username); + free(context->accountname); + free(context->protocol); + free(context->smstate); + context->username = NULL; + context->accountname = NULL; + context->protocol = NULL; + context->smstate = NULL; + + /* Free the application data, if it exists */ + if (context->app_data && context->app_data_free) { (context->app_data_free)(context->app_data); context->app_data = NULL; - } + } - /* Fix the list linkages */ - *(context->tous) = context->next; - if (context->next) { + /* Fix the list linkages */ + *(context->tous) = context->next; + if (context->next) { context->next->tous = context->tous; - } + } - free(context); + free(context); + return 0; } /* Forget all the contexts in a given OtrlUserState. */ void otrl_context_forget_all(OtrlUserState us) { - while (us->context_root) { - otrl_context_force_plaintext(us->context_root); + ConnContext *c_iter; + + for (c_iter = us->context_root; c_iter; c_iter = c_iter->next) { + otrl_context_force_plaintext(c_iter); + } + + while (us->context_root) { otrl_context_forget(us->context_root); - } + } } diff --git a/plugins/MirOTR/libotr/src/context.h b/plugins/MirOTR/libotr/src/context.h index 91a1b45c52..55cd082845 100644 --- a/plugins/MirOTR/libotr/src/context.h +++ b/plugins/MirOTR/libotr/src/context.h @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,18 +16,24 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __CONTEXT_H__ #define __CONTEXT_H__ +#include "context_priv.h" + #include <gcrypt.h> #include "dh.h" #include "auth.h" #include "sm.h" +typedef struct context ConnContext; /* Forward declare */ + +#include "instag.h" + typedef enum { OTRL_MSGSTATE_PLAINTEXT, /* Not yet started an encrypted conversation */ @@ -47,23 +55,40 @@ typedef struct s_fingerprint { char *trust; /* The trust level of the fingerprint */ } Fingerprint; -typedef struct context { +struct context { struct context * next; /* Linked list pointer */ struct context ** tous; /* A pointer to the pointer to us */ + /* Context information that is meant for internal use */ + + ConnContextPriv *context_priv; + + /* Context information that is meant for application use */ + char * username; /* The user this context is for */ char * accountname; /* The username is relative to this account... */ char * protocol; /* ... and this protocol */ - char *fragment; /* The part of the fragmented message - we've seen so far */ - size_t fragment_len; /* The length of fragment */ - unsigned short fragment_n; /* The total number of fragments - in this message */ - unsigned short fragment_k; /* The highest fragment number - we've seen so far for this - message */ + struct context *m_context; /* If this is a child context, this + field will point to the master + context. Otherwise it will point to + itself. */ + struct context *recent_rcvd_child; /* If this is a master context, this + points to the child context that + has received a message most recently. + By default, it will point to the + master context. In child contexts + this field is NULL. */ + struct context *recent_sent_child; /* Similar to above, but it points to + the child who has sent most + recently. */ + struct context *recent_child; /* Similar to above, but will point to + the most recent of recent_rcvd_child + and recent_sent_child */ + + otrl_instag_t our_instance; /* Our instance tag for this computer*/ + otrl_instag_t their_instance; /* The user's instance tag */ OtrlMessageState msgstate; /* The state of message disposition with this user */ @@ -71,23 +96,13 @@ typedef struct context { authentication with this user */ Fingerprint fingerprint_root; /* The root of a linked list of - Fingerprints entries */ + Fingerprints entries. This list will + only be populated in master contexts. + For child contexts, + fingerprint_root.next will always + point to NULL. */ Fingerprint *active_fingerprint; /* Which fingerprint is in use now? - A pointer into the above list */ - unsigned int their_keyid; /* current keyid used by other side; - this is set to 0 if we get a - OTRL_TLV_DISCONNECTED message from - them. */ - gcry_mpi_t their_y; /* Y[their_keyid] (their DH pubkey) */ - gcry_mpi_t their_old_y; /* Y[their_keyid-1] (their prev DH - pubkey) */ - unsigned int our_keyid; /* current keyid used by us */ - DH_keypair our_dh_key; /* DH key[our_keyid] */ - DH_keypair our_old_dh_key; /* DH key[our_keyid-1] */ - - DH_sesskeys sesskeys[2][2]; /* sesskeys[i][j] are the session keys - derived from DH key[our_keyid-i] - and mpi Y[their_keyid-j] */ + A pointer into the above list */ unsigned char sessionid[20]; /* The sessionid and bold half */ size_t sessionid_len; /* determined when this private */ @@ -95,24 +110,6 @@ typedef struct context { unsigned int protocol_version; /* The version of OTR in use */ - unsigned char *preshared_secret; /* A secret you share with this - user, in order to do - authentication. */ - size_t preshared_secret_len; /* The length of the above secret. */ - - /* saved mac keys to be revealed later */ - unsigned int numsavedkeys; - unsigned char *saved_mac_keys; - - /* generation number: increment every time we go private, and never - * reset to 0 (unless we remove the context entirely) */ - unsigned int generation; - - time_t lastsent; /* The last time a Data Message was sent */ - char *lastmessage; /* The plaintext of the last Data Message sent */ - int may_retransmit; /* Is the last message eligible for - retransmission? */ - enum { OFFER_NOT, OFFER_SENT, @@ -127,24 +124,32 @@ typedef struct context { void (*app_data_free)(void *); OtrlSMState *smstate; /* The state of the current - socialist millionaires exchange */ -} ConnContext; + socialist millionaires exchange */ +}; #include "userstate.h" -ConnContext * otrl_context_new(const char * user, const char * accountname, - const char * protocol); - -/* Look up a connection context by name/account/protocol from the given - * OtrlUserState. If add_if_missing is true, allocate and return a new - * context if one does not currently exist. In that event, call +/* Look up a connection context by name/account/protocol/instance from the + * given OtrlUserState. If add_if_missing is true, allocate and return a + * new context if one does not currently exist. In that event, call * add_app_data(data, context) so that app_data and app_data_free can be - * filled in by the application, and set *addedp to 1. */ + * filled in by the application, and set *addedp to 1. + * In the 'their_instance' field note that you can also specify a 'meta- + * instance' value such as OTRL_INSTAG_MASTER, OTRL_INSTAL_RECENT, + * OTRL_INSTAG_RECENT_RECEIVED and OTRL_INSTAG_RECENT_SENT. */ ConnContext * otrl_context_find(OtrlUserState us, const char *user, - const char *accountname, const char *protocol, int add_if_missing, - int *addedp, + const char *accountname, const char *protocol, + otrl_instag_t their_instance, int add_if_missing, int *addedp, void (*add_app_data)(void *data, ConnContext *context), void *data); +/* Return true iff the given fingerprint is marked as trusted. */ +int otrl_context_is_fingerprint_trusted(Fingerprint *fprint); + +/* This method gets called after sending or receiving a message, to + * update the master context's "recent context" pointers. */ +void otrl_context_update_recent_child(ConnContext *context, + unsigned int sent_msg); + /* Find a fingerprint in a given context, perhaps adding it if not * present. */ Fingerprint *otrl_context_find_fingerprint(ConnContext *context, @@ -153,12 +158,6 @@ Fingerprint *otrl_context_find_fingerprint(ConnContext *context, /* Set the trust level for a given fingerprint */ void otrl_context_set_trust(Fingerprint *fprint, const char *trust); -/* Set the preshared secret for a given fingerprint. Note that this - * currently only stores the secret in the ConnContext structure, but - * doesn't yet do anything with it. */ -void otrl_context_set_preshared_secret(ConnContext *context, - const unsigned char *secret, size_t secret_len); - /* Force a context into the OTRL_MSGSTATE_FINISHED state. */ void otrl_context_force_finished(ConnContext *context); @@ -173,10 +172,22 @@ void otrl_context_force_plaintext(ConnContext *context); void otrl_context_forget_fingerprint(Fingerprint *fprint, int and_maybe_context); -/* Forget a whole context, so long as it's PLAINTEXT. */ -void otrl_context_forget(ConnContext *context); +/* Forget a whole context, so long as it's PLAINTEXT. If a context has child + * instances, don't remove this instance unless children are also all in + * PLAINTEXT state. In this case, the children will also be removed. + * Returns 0 on success, 1 on failure. */ +int otrl_context_forget(ConnContext *context); /* Forget all the contexts in a given OtrlUserState. */ void otrl_context_forget_all(OtrlUserState us); +/* Find requested recent instance */ +ConnContext * otrl_context_find_recent_instance(ConnContext * context, + otrl_instag_t recent_instag); + +/* Find the instance of this context that has the best security level, and for + * which we have most recently received a message from. Note that most recent + * in this case is limited to a one-second resolution. */ +ConnContext * otrl_context_find_recent_secure_instance(ConnContext * context); + #endif diff --git a/plugins/MirOTR/libotr/src/context_priv.c b/plugins/MirOTR/libotr/src/context_priv.c new file mode 100644 index 0000000000..47d05b9204 --- /dev/null +++ b/plugins/MirOTR/libotr/src/context_priv.c @@ -0,0 +1,95 @@ +/* + * Off-the-Record Messaging library + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov + * <otr@cypherpunks.ca> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General + * Public License as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* system headers */ +#include <stdlib.h> +#include <assert.h> + +/* libgcrypt headers */ +#include <gcrypt.h> + +/* libotr headers */ +#include "context_priv.h" + +/* Create a new private connection context */ +ConnContextPriv *otrl_context_priv_new() +{ + ConnContextPriv *context_priv; + context_priv = malloc(sizeof(*context_priv)); + assert(context_priv != NULL); + + context_priv->fragment = NULL; + context_priv->fragment_len = 0; + context_priv->fragment_n = 0; + context_priv->fragment_k = 0; + context_priv->numsavedkeys = 0; + context_priv->saved_mac_keys = NULL; + context_priv->generation = 0; + context_priv->lastsent = 0; + context_priv->lastmessage = NULL; + context_priv->lastrecv = 0; + context_priv->may_retransmit = 0; + context_priv->their_keyid = 0; + context_priv->their_y = NULL; + context_priv->their_old_y = NULL; + context_priv->our_keyid = 0; + context_priv->our_dh_key.groupid = 0; + context_priv->our_dh_key.priv = NULL; + context_priv->our_dh_key.pub = NULL; + context_priv->our_old_dh_key.groupid = 0; + context_priv->our_old_dh_key.priv = NULL; + context_priv->our_old_dh_key.pub = NULL; + otrl_dh_session_blank(&(context_priv->sesskeys[0][0])); + otrl_dh_session_blank(&(context_priv->sesskeys[0][1])); + otrl_dh_session_blank(&(context_priv->sesskeys[1][0])); + otrl_dh_session_blank(&(context_priv->sesskeys[1][1])); + + return context_priv; +} + +/* Resets the appropriate variables when a context + * is being force finished + */ +void otrl_context_priv_force_finished(ConnContextPriv *context_priv) +{ + free(context_priv->fragment); + context_priv->fragment = NULL; + context_priv->fragment_len = 0; + context_priv->fragment_n = 0; + context_priv->fragment_k = 0; + context_priv->numsavedkeys = 0; + free(context_priv->saved_mac_keys); + context_priv->saved_mac_keys = NULL; + gcry_free(context_priv->lastmessage); + context_priv->lastmessage = NULL; + context_priv->may_retransmit = 0; + context_priv->their_keyid = 0; + gcry_mpi_release(context_priv->their_y); + context_priv->their_y = NULL; + gcry_mpi_release(context_priv->their_old_y); + context_priv->their_old_y = NULL; + context_priv->our_keyid = 0; + otrl_dh_keypair_free(&(context_priv->our_dh_key)); + otrl_dh_keypair_free(&(context_priv->our_old_dh_key)); + otrl_dh_session_free(&(context_priv->sesskeys[0][0])); + otrl_dh_session_free(&(context_priv->sesskeys[0][1])); + otrl_dh_session_free(&(context_priv->sesskeys[1][0])); + otrl_dh_session_free(&(context_priv->sesskeys[1][1])); +} diff --git a/plugins/MirOTR/libotr/src/context_priv.h b/plugins/MirOTR/libotr/src/context_priv.h new file mode 100644 index 0000000000..0748074e9b --- /dev/null +++ b/plugins/MirOTR/libotr/src/context_priv.h @@ -0,0 +1,94 @@ +/* + * Off-the-Record Messaging library + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Lisa Du, Nikita Borisov + * <otr@cypherpunks.ca> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General + * Public License as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef __CONTEXT_PRIV_H__ +#define __CONTEXT_PRIV_H__ + +#include <gcrypt.h> + +#include "dh.h" +#include "auth.h" +#include "sm.h" + +typedef struct context_priv { + /* The part of the fragmented message we've seen so far */ + char *fragment; + + /* The length of fragment */ + size_t fragment_len; + + /* The total number of fragments in this message */ + unsigned short fragment_n; + + /* The highest fragment number we've seen so far for this message */ + unsigned short fragment_k; + + /* current keyid used by other side; this is set to 0 if we get + * a OTRL_TLV_DISCONNECTED message from them. */ + unsigned int their_keyid; + + /* Y[their_keyid] (their DH pubkey) */ + gcry_mpi_t their_y; + + /* Y[their_keyid-1] (their prev DH pubkey) */ + gcry_mpi_t their_old_y; + + /* current keyid used by us */ + unsigned int our_keyid; + + /* DH key[our_keyid] */ + DH_keypair our_dh_key; + + /* DH key[our_keyid-1] */ + DH_keypair our_old_dh_key; + + /* sesskeys[i][j] are the session keys derived from DH + * key[our_keyid-i] and mpi Y[their_keyid-j] */ + DH_sesskeys sesskeys[2][2]; + + /* saved mac keys to be revealed later */ + unsigned int numsavedkeys; + unsigned char *saved_mac_keys; + + /* generation number: increment every time we go private, and never + * reset to 0 (unless we remove the context entirely) */ + unsigned int generation; + + /* The last time a Data Message was sent */ + time_t lastsent; + + /* The last time a Data Message was received */ + time_t lastrecv; + + /* The plaintext of the last Data Message sent */ + char *lastmessage; + + /* Is the last message eligible for retransmission? */ + int may_retransmit; + +} ConnContextPriv; + +/* Create a new private connection context. */ +ConnContextPriv *otrl_context_priv_new(); + +/* Frees up memory that was used in otrl_context_priv_new */ +void otrl_context_priv_force_finished(ConnContextPriv *context_priv); + +#endif diff --git a/plugins/MirOTR/libotr/src/dh.c b/plugins/MirOTR/libotr/src/dh.c index e23788dd08..d8bc45d10d 100644 --- a/plugins/MirOTR/libotr/src/dh.c +++ b/plugins/MirOTR/libotr/src/dh.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -26,6 +28,7 @@ /* libotr headers */ #include "dh.h" + static const char* DH1536_MODULUS_S = "0x" "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" @@ -49,9 +52,10 @@ static gcry_mpi_t DH1536_GENERATOR = NULL; */ void otrl_dh_init(void) { - gcry_mpi_scan(&DH1536_MODULUS, GCRYMPI_FMT_HEX, DH1536_MODULUS_S, 0, NULL); - gcry_mpi_scan(&DH1536_GENERATOR, GCRYMPI_FMT_HEX, DH1536_GENERATOR_S, - 0, NULL); + gcry_mpi_scan(&DH1536_MODULUS, GCRYMPI_FMT_HEX, + (const unsigned char *)DH1536_MODULUS_S, 0, NULL); + gcry_mpi_scan(&DH1536_GENERATOR, GCRYMPI_FMT_HEX, + (const unsigned char *)DH1536_GENERATOR_S, 0, NULL); DH1536_MODULUS_MINUS_2 = gcry_mpi_new(DH1536_MOD_LEN_BITS); gcry_mpi_sub_ui(DH1536_MODULUS_MINUS_2, DH1536_MODULUS, 2); } @@ -90,7 +94,7 @@ void otrl_dh_keypair_free(DH_keypair *kp) /* * Generate a DH keypair for a specified group. - */ + */ gcry_error_t otrl_dh_gen_keypair(unsigned int groupid, DH_keypair *kp) { unsigned char *secbuf = NULL; @@ -135,7 +139,7 @@ gcry_error_t otrl_dh_session(DH_sesskeys *sess, const DH_keypair *kp, } /* Calculate the shared secret MPI */ - gab = gcry_mpi_new(DH1536_MOD_LEN_BITS); + gab = gcry_mpi_snew(DH1536_MOD_LEN_BITS); gcry_mpi_powm(gab, y, kp->priv, DH1536_MODULUS); /* Output it in the right format */ @@ -200,6 +204,11 @@ gcry_error_t otrl_dh_session(DH_sesskeys *sess, const DH_keypair *kp, err = gcry_md_setkey(sess->rcvmac, sess->rcvmackey, 20); if (err) goto err; + /* Calculate the extra key (used if applications wish to extract a + * symmetric key for transferring files, or something like that) */ + gabdata[0] = 0xff; + gcry_md_hash_buffer(GCRY_MD_SHA256, sess->extrakey, gabdata, gablen+5); + gcry_free(gabdata); gcry_free(hashdata); return gcry_error(GPG_ERR_NO_ERROR); @@ -248,7 +257,7 @@ gcry_error_t otrl_dh_compute_v2_auth_keys(const DH_keypair *our_dh, } /* Calculate the shared secret MPI */ - s = gcry_mpi_new(DH1536_MOD_LEN_BITS); + s = gcry_mpi_snew(DH1536_MOD_LEN_BITS); gcry_mpi_powm(s, their_pub, our_dh->priv, DH1536_MODULUS); /* Output it in the right format */ @@ -273,7 +282,7 @@ gcry_error_t otrl_dh_compute_v2_auth_keys(const DH_keypair *our_dh, } sdata[0] = 0x00; gcry_md_hash_buffer(GCRY_MD_SHA256, hashdata, sdata, slen+5); - memcpy(sessionid, hashdata, 8); + memmove(sessionid, hashdata, 8); *sessionidlenp = 8; /* Calculate the encryption keys */ @@ -373,7 +382,7 @@ gcry_error_t otrl_dh_compute_v1_session_id(const DH_keypair *our_dh, } /* Calculate the shared secret MPI */ - s = gcry_mpi_new(DH1536_MOD_LEN_BITS); + s = gcry_mpi_snew(DH1536_MOD_LEN_BITS); gcry_mpi_powm(s, their_pub, our_dh->priv, DH1536_MODULUS); /* Output it in the right format */ @@ -398,7 +407,7 @@ gcry_error_t otrl_dh_compute_v1_session_id(const DH_keypair *our_dh, } sdata[0] = 0x00; gcry_md_hash_buffer(GCRY_MD_SHA1, hashdata, sdata, slen+5); - memcpy(sessionid, hashdata, 20); + memmove(sessionid, hashdata, 20); *sessionidlenp = 20; /* Which half should be bold? */ @@ -442,6 +451,7 @@ void otrl_dh_session_blank(DH_sesskeys *sess) memset(sess->rcvmackey, 0, 20); sess->sendmacused = 0; sess->rcvmacused = 0; + memset(sess->extrakey, 0, OTRL_EXTRAKEY_BYTES); } /* Increment the top half of a counter block */ diff --git a/plugins/MirOTR/libotr/src/dh.h b/plugins/MirOTR/libotr/src/dh.h index d68328f528..742c408042 100644 --- a/plugins/MirOTR/libotr/src/dh.h +++ b/plugins/MirOTR/libotr/src/dh.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __DH_H__ @@ -33,6 +34,8 @@ typedef enum { OTRL_SESSIONID_SECOND_HALF_BOLD } OtrlSessionIdHalf; +#define OTRL_EXTRAKEY_BYTES 32 + typedef struct { unsigned char sendctr[16]; unsigned char rcvctr[16]; @@ -44,6 +47,7 @@ typedef struct { gcry_md_hd_t rcvmac; unsigned char rcvmackey[20]; int rcvmacused; + unsigned char extrakey[OTRL_EXTRAKEY_BYTES]; } DH_sesskeys; /* @@ -70,7 +74,7 @@ void otrl_dh_keypair_free(DH_keypair *kp); /* * Generate a DH keypair for a specified group. - */ + */ gcry_error_t otrl_dh_gen_keypair(unsigned int groupid, DH_keypair *kp); /* diff --git a/plugins/MirOTR/libotr/src/instag.c b/plugins/MirOTR/libotr/src/instag.c new file mode 100644 index 0000000000..6b829de449 --- /dev/null +++ b/plugins/MirOTR/libotr/src/instag.c @@ -0,0 +1,262 @@ +/* + * Off-the-Record Messaging library + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov + * <otr@cypherpunks.ca> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General + * Public License as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* system headers */ +#include <stdio.h> +#include <stdlib.h> + +/* libgcrypt headers */ +#include <gcrypt.h> + +/* libotr headers */ +#include "instag.h" +#include "userstate.h" + +/* Forget the given instag. */ +void otrl_instag_forget(OtrlInsTag* instag) { + if (!instag) return; + + if (instag->accountname) free(instag->accountname); + if (instag->protocol) free(instag->protocol); + + /* Re-link the list */ + *(instag->tous) = instag->next; + if (instag->next) { + instag->next->tous = instag->tous; + } + + free(instag); +} + +/* Forget all instags in a given OtrlUserState. */ +void otrl_instag_forget_all(OtrlUserState us) { + while(us->instag_root) { + otrl_instag_forget(us->instag_root); + } +} + +/* Fetch the instance tag from the given OtrlUserState associated with + * the given account */ +OtrlInsTag * otrl_instag_find(OtrlUserState us, const char *accountname, + const char *protocol) +{ + OtrlInsTag *p; + + for(p=us->instag_root; p; p=p->next) { + if (!strcmp(p->accountname, accountname) && + !strcmp(p->protocol, protocol)) { + return p; + } + } + return NULL; +} + +/* Read our instance tag from a file on disk into the given + * OtrlUserState. */ +gcry_error_t otrl_instag_read(OtrlUserState us, const char *filename) +{ + gcry_error_t err; + FILE *instf; + + /* Open the instance tag file. */ + instf = fopen(filename, "rb"); + if (!instf) { + return gcry_error_from_errno(errno); + } + + err = otrl_instag_read_FILEp(us, instf); + fclose(instf); + return err; +} + +/* Read our instance tag from a file on disk into the given + * OtrlUserState. The FILE* must be open for reading. */ +gcry_error_t otrl_instag_read_FILEp(OtrlUserState us, FILE *instf) +{ + + OtrlInsTag *p; + char storeline[1000]; + size_t maxsize = sizeof(storeline); + + if (!instf) return gcry_error(GPG_ERR_NO_ERROR); + + while(fgets(storeline, maxsize, instf)) { + char *prevpos; + char *pos; + unsigned int instag = 0; + + p = malloc(sizeof(*p)); + if (!p) { + return gcry_error(GPG_ERR_ENOMEM); + } + + /* Parse the line, which should be of the form: + * accountname\tprotocol\t40_hex_nybbles\n */ + prevpos = storeline; + pos = strchr(prevpos, '\t'); + if (!pos) { + free(p); + continue; + } + *pos = '\0'; + pos++; + p->accountname = malloc(pos - prevpos); + memmove(p->accountname, prevpos, pos - prevpos); + + prevpos = pos; + pos = strchr(prevpos, '\t'); + if (!pos) { + free(p); + continue; + } + *pos = '\0'; + pos++; + p->protocol = malloc(pos - prevpos); + memmove(p->protocol, prevpos, pos - prevpos); + + prevpos = pos; + pos = strchr(prevpos, '\r'); + if (!pos) pos = strchr(prevpos, '\n'); + if (!pos) { + free(p); + continue; + } + *pos = '\0'; + pos++; + /* hex str of length 8 */ + if (strlen(prevpos) != 8) { + free(p); + continue; + } + + sscanf(prevpos, "%08x", &instag); + + if (instag < OTRL_MIN_VALID_INSTAG) { + free(p); + continue; + } + p->instag = instag; + + /* Link it up */ + p->next = us->instag_root; + if (p->next) { + p->next->tous = &(p->next); + } + p->tous = &(us->instag_root); + us->instag_root = p; + } + + return gcry_error(GPG_ERR_NO_ERROR); +} + +/* Generate a new instance tag for the given account and write to file */ +gcry_error_t otrl_instag_generate(OtrlUserState us, const char *filename, + const char *accountname, const char *protocol) +{ + gcry_error_t err; + FILE *instf; + + /* Open the instance tag file. */ + instf = fopen(filename, "wb"); + if (!instf) { + return gcry_error_from_errno(errno); + } + + err = otrl_instag_generate_FILEp(us, instf, accountname, protocol); + fclose(instf); + return err; +} + +/* Return a new valid instance tag */ +otrl_instag_t otrl_instag_get_new() +{ + otrl_instag_t result = 0; + + while(result < OTRL_MIN_VALID_INSTAG) { + otrl_instag_t * instag = (otrl_instag_t *)gcry_random_bytes( + sizeof(otrl_instag_t), GCRY_STRONG_RANDOM); + result = *instag; + gcry_free(instag); + } + + return result; +} + +/* Generate a new instance tag for the given account and write to file + * The FILE* must be open for writing. */ +gcry_error_t otrl_instag_generate_FILEp(OtrlUserState us, FILE *instf, + const char *accountname, const char *protocol) +{ + OtrlInsTag *p; + if (!accountname || !protocol) return gcry_error(GPG_ERR_NO_ERROR); + + p = (OtrlInsTag *)malloc(sizeof(OtrlInsTag)); + p->accountname = strdup(accountname); + p->protocol = strdup(protocol); + + p->instag = otrl_instag_get_new(); + + /* Add to our list in OtrlUserState */ + p->next = us->instag_root; + if (p->next) { + p->next->tous = &(p->next); + } + p->tous = &(us->instag_root); + us->instag_root = p; + + otrl_instag_write_FILEp(us, instf); + + return gcry_error(GPG_ERR_NO_ERROR); +} + +/* Write our instance tags to a file on disk. */ +gcry_error_t otrl_instag_write(OtrlUserState us, const char *filename) +{ + gcry_error_t err; + FILE *instf; + + /* Open the instance tag file. */ + instf = fopen(filename, "wb"); + if (!instf) { + return gcry_error_from_errno(errno); + } + + err = otrl_instag_write_FILEp(us, instf); + fclose(instf); + return err; +} + +/* Write our instance tags to a file on disk. + * The FILE* must be open for writing. */ +gcry_error_t otrl_instag_write_FILEp(OtrlUserState us, FILE *instf) +{ + OtrlInsTag *p; + /* This line should be ignored when read back in, since there are no + tabs. */ + fprintf(instf, "# WARNING! You shouldn't copy this file to another" + " computer. It is unnecessary and can cause problems.\n"); + for(p=us->instag_root; p; p=p->next) { + fprintf(instf, "%s\t%s\t%08x\n", p->accountname, p->protocol, + p->instag); + } + + return gcry_error(GPG_ERR_NO_ERROR); +} + diff --git a/plugins/MirOTR/libotr/src/instag.h b/plugins/MirOTR/libotr/src/instag.h new file mode 100644 index 0000000000..c8aabb324f --- /dev/null +++ b/plugins/MirOTR/libotr/src/instag.h @@ -0,0 +1,89 @@ +/* + * Off-the-Record Messaging library + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov + * <otr@cypherpunks.ca> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General + * Public License as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef __INSTAG_H__ +#define __INSTAG_H__ + +#include <stdio.h> +#include <errno.h> + +#define OTRL_INSTAG_MASTER 0 +#define OTRL_INSTAG_BEST 1 /* Most secure, based on: conv status, + * then fingerprint status, then most recent. */ +#define OTRL_INSTAG_RECENT 2 +#define OTRL_INSTAG_RECENT_RECEIVED 3 +#define OTRL_INSTAG_RECENT_SENT 4 + +#define OTRL_MIN_VALID_INSTAG 0x100 /* Instag values below this are reserved + * for meta instags, defined above, */ + +typedef unsigned int otrl_instag_t; + +/* The list of instance tags used for our accounts */ +typedef struct s_OtrlInsTag { + struct s_OtrlInsTag *next; + struct s_OtrlInsTag **tous; + + char *accountname; + char *protocol; + otrl_instag_t instag; +} OtrlInsTag; + +#include "userstate.h" + +/* Forget the given instag. */ +void otrl_instag_forget(OtrlInsTag* instag); + +/* Forget all instags in a given OtrlUserState. */ +void otrl_instag_forget_all(OtrlUserState us); + +/* Fetch the instance tag from the given OtrlUserState associated with + * the given account */ +OtrlInsTag * otrl_instag_find(OtrlUserState us, const char *accountname, + const char *protocol); + +/* Read our instance tag from a file on disk into the given + * OtrlUserState. */ +gcry_error_t otrl_instag_read(OtrlUserState us, const char *filename); + +/* Read our instance tag from a file on disk into the given + * OtrlUserState. The FILE* must be open for reading. */ +gcry_error_t otrl_instag_read_FILEp(OtrlUserState us, FILE *instf); + +/* Return a new valid instance tag */ +otrl_instag_t otrl_instag_get_new(); + +/* Get a new instance tag for the given account and write to file*/ +gcry_error_t otrl_instag_generate(OtrlUserState us, const char *filename, + const char *accountname, const char *protocol); + +/* Get a new instance tag for the given account and write to file + * The FILE* must be open for writing. */ +gcry_error_t otrl_instag_generate_FILEp(OtrlUserState us, FILE *instf, + const char *accountname, const char *protocol); + +/* Write our instance tags to a file on disk. */ +gcry_error_t otrl_instag_write(OtrlUserState us, const char *filename); + +/* Write our instance tags to a file on disk. + * The FILE* must be open for writing. */ +gcry_error_t otrl_instag_write_FILEp(OtrlUserState us, FILE *instf); + +#endif diff --git a/plugins/MirOTR/libotr/src/mem.c b/plugins/MirOTR/libotr/src/mem.c index fe32baadc4..29330ae757 100644 --- a/plugins/MirOTR/libotr/src/mem.c +++ b/plugins/MirOTR/libotr/src/mem.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* Memory allocation routines for libgcrypt. All of the session key @@ -45,61 +47,61 @@ /* libotr headers */ #include "mem.h" -static int header_size; +static size_t header_size; static void *otrl_mem_malloc(size_t n) { - void *p; - size_t new_n = n; - new_n += header_size; + void *p; + size_t new_n = n; + new_n += header_size; - /* Check for overflow attack */ - if (new_n < n) return NULL; - p = malloc(new_n); - if (p == NULL) return NULL; + /* Check for overflow attack */ + if (new_n < n) return NULL; + p = malloc(new_n); + if (p == NULL) return NULL; - ((size_t *)p)[0] = new_n; /* Includes header size */ + ((size_t *)p)[0] = new_n; /* Includes header size */ #ifdef OTRL_MEM_MAGIC - ((size_t *)p)[1] = OTRL_MEM_MAGIC; + ((size_t *)p)[1] = OTRL_MEM_MAGIC; #endif - return (void *)((char *)p + header_size); + return (void *)((char *)p + header_size); } static int otrl_mem_is_secure(const void *p) { - return 1; + return 1; } static void otrl_mem_free(void *p) { - void *real_p = (void *)((char *)p - header_size); - size_t n = ((size_t *)real_p)[0]; + void *real_p = (void *)((char *)p - header_size); + size_t n = ((size_t *)real_p)[0]; #ifdef OTRL_MEM_MAGIC - if (((size_t *)real_p)[1] != OTRL_MEM_MAGIC) { + if (((size_t *)real_p)[1] != OTRL_MEM_MAGIC) { fprintf(stderr, "Illegal free!\n"); return; - } + } #endif - /* Wipe the memory (in the same way the built-in deallocator in - * libgcrypt would) */ - memset(real_p, 0xff, n); - memset(real_p, 0xaa, n); - memset(real_p, 0x55, n); - memset(real_p, 0x00, n); + /* Wipe the memory (in the same way the built-in deallocator in + * libgcrypt would) */ + memset(real_p, 0xff, n); + memset(real_p, 0xaa, n); + memset(real_p, 0x55, n); + memset(real_p, 0x00, n); - free(real_p); + free(real_p); } static void *otrl_mem_realloc(void *p, size_t n) { - if (p == NULL) { + if (p == NULL) { return otrl_mem_malloc(n); - } else if (n == 0) { + } else if (n == 0) { otrl_mem_free(p); return NULL; - } else { + } else { void *real_p = (void *)((char *)p - header_size); void *new_p; size_t old_n = ((size_t *)real_p)[0]; @@ -114,50 +116,65 @@ static void *otrl_mem_realloc(void *p, size_t n) #ifdef OTRL_MEM_MAGIC if (magic != OTRL_MEM_MAGIC) { - fprintf(stderr, "Illegal realloc!\n"); - return NULL; + fprintf(stderr, "Illegal realloc!\n"); + return NULL; } #endif if (new_n < old_n) { - /* Overwrite the space we're about to stop using */ - void *p = (void *)((char *)real_p + new_n); - size_t excess = old_n - new_n; - memset(p, 0xff, excess); - memset(p, 0xaa, excess); - memset(p, 0x55, excess); - memset(p, 0x00, excess); - - /* We don't actually need to realloc() */ - new_p = real_p; + /* Overwrite the space we're about to stop using */ + void *p = (void *)((char *)real_p + new_n); + size_t excess = old_n - new_n; + memset(p, 0xff, excess); + memset(p, 0xaa, excess); + memset(p, 0x55, excess); + memset(p, 0x00, excess); + + /* We don't actually need to realloc() */ + new_p = real_p; } else { - new_p = realloc(real_p, new_n); - if (new_p == NULL) return NULL; + new_p = realloc(real_p, new_n); + if (new_p == NULL) return NULL; } ((size_t *)new_p)[0] = new_n; /* Includes header size */ return (void *)((char *)new_p + header_size); - } + } } void otrl_mem_init(void) { - header_size = 8; + header_size = 8; #ifdef OTRL_MEM_MAGIC - if (header_size < 2*sizeof(size_t)) { + if (header_size < 2*sizeof(size_t)) { header_size = 2*sizeof(size_t); - } + } #else - if (header_size < sizeof(size_t)) { + if (header_size < sizeof(size_t)) { header_size = sizeof(size_t); - } + } #endif - gcry_set_allocation_handler( - otrl_mem_malloc, - otrl_mem_malloc, - otrl_mem_is_secure, - otrl_mem_realloc, - otrl_mem_free + gcry_set_allocation_handler( + otrl_mem_malloc, + otrl_mem_malloc, + otrl_mem_is_secure, + otrl_mem_realloc, + otrl_mem_free ); } + +/* Compare two memory blocks in time dependent on the length of the + * blocks, but not their contents. Returns 1 if they differ, 0 if they + * are the same. */ +int otrl_mem_differ(const unsigned char *buf1, const unsigned char *buf2, + size_t len) +{ + volatile unsigned char diff = 0; + size_t i; + + for (i = 0; i < len; ++i) { + diff |= (buf1[i] ^ buf2[i]); + } + return (diff != 0); +} diff --git a/plugins/MirOTR/libotr/src/mem.h b/plugins/MirOTR/libotr/src/mem.h index 19e00cf5aa..2baf8f2e9a 100644 --- a/plugins/MirOTR/libotr/src/mem.h +++ b/plugins/MirOTR/libotr/src/mem.h @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,12 +16,20 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __MEM_H__ #define __MEM_H__ +#include <stdlib.h> + void otrl_mem_init(void); +/* Compare two memory blocks in time dependent on the length of the + * blocks, but not their contents. Returns 1 if they differ, 0 if they + * are the same. */ +int otrl_mem_differ(const unsigned char *buf1, const unsigned char *buf2, + size_t len); + #endif diff --git a/plugins/MirOTR/libotr/src/message.c b/plugins/MirOTR/libotr/src/message.c index b385c1f4f1..b13710cccd 100644 --- a/plugins/MirOTR/libotr/src/message.c +++ b/plugins/MirOTR/libotr/src/message.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -27,10 +29,23 @@ /* libotr headers */ #include "privkey.h" +#include "userstate.h" #include "proto.h" #include "auth.h" #include "message.h" #include "sm.h" +#include "instag.h" + +#if OTRL_DEBUGGING +#include <stdio.h> + +/* If OTRL_DEBUGGING is on, and the user types this string, the current + * context and its siblings will be dumped to stderr. */ +const char *OTRL_DEBUGGING_DEBUGSTR = "?OTR!"; + +void otrl_context_all_dump(FILE *f, OtrlUserState us); +void otrl_context_siblings_dump(FILE *f, const ConnContext *context); +#endif /* The API version */ extern unsigned int otrl_api_version; @@ -42,10 +57,109 @@ extern unsigned int otrl_api_version; * resending in response to a rekey? */ #define RESEND_INTERVAL 60 +/* How long should we wait for the last of the logged-in instances of + * our buddy to respond before marking our private key as a candidate + * for wiping (in seconds)? */ +#define MAX_AKE_WAIT_TIME 60 + +/* How frequently should we check our ConnContexts for wipeable private + * keys (and wipe them) (in seconds)? */ +#define POLL_DEFAULT_INTERVAL 70 + +/* Send a message to the network, fragmenting first if necessary. + * All messages to be sent to the network should go through this + * method immediately before they are sent, ie after encryption. */ +static gcry_error_t fragment_and_send(const OtrlMessageAppOps *ops, + void *opdata, ConnContext *context, const char *message, + OtrlFragmentPolicy fragPolicy, char **returnFragment) +{ + int mms = 0; + + if (message && ops->inject_message) { + int msglen; + + if (ops->max_message_size) { + mms = ops->max_message_size(opdata, context); + } + msglen = strlen(message); + + /* Don't incur overhead of fragmentation unless necessary */ + if(mms != 0 && msglen > mms) { + char **fragments; + gcry_error_t err; + int i; + int headerlen = context->protocol_version == 3 ? 37 : 19; + /* Like ceil(msglen/(mms - headerlen)) */ + int fragment_count = ((msglen - 1) / (mms - headerlen)) + 1; + + err = otrl_proto_fragment_create(mms, fragment_count, &fragments, + context, message); + if (err) { + return err; + } + + /* Determine which fragments to send and which to return + * based on given Fragment Policy. If the first fragment + * should be returned instead of sent, store it. */ + if (fragPolicy == OTRL_FRAGMENT_SEND_ALL_BUT_FIRST) { + *returnFragment = strdup(fragments[0]); + } else { + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, fragments[0]); + } + for (i=1; i<fragment_count-1; i++) { + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, fragments[i]); + } + /* If the last fragment should be stored instead of sent, + * store it */ + if (fragPolicy == OTRL_FRAGMENT_SEND_ALL_BUT_LAST) { + *returnFragment = strdup(fragments[fragment_count-1]); + } else { + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, + fragments[fragment_count-1]); + } + /* Now free all fragment memory */ + otrl_proto_fragment_free(&fragments, fragment_count); + + } else { + /* No fragmentation necessary */ + if (fragPolicy == OTRL_FRAGMENT_SEND_ALL) { + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, message); + } else { + /* Copy and return the entire given message. */ + *returnFragment = strdup(message); + } + } + } + + return gcry_error(GPG_ERR_NO_ERROR); +} + +static void populate_context_instag(OtrlUserState us, const OtrlMessageAppOps + *ops, void *opdata, const char *accountname, const char *protocol, + ConnContext *context) { + OtrlInsTag *p_instag; + + p_instag = otrl_instag_find(us, accountname, protocol); + if ((!p_instag) && ops->create_instag) { + ops->create_instag(opdata, accountname, protocol); + p_instag = otrl_instag_find(us, accountname, protocol); + } + + if (p_instag && p_instag->instag >= OTRL_MIN_VALID_INSTAG) { + context->our_instance = p_instag->instag; + } else { + context->our_instance = otrl_instag_get_new(); + } +} + /* Deallocate a message allocated by other otrl_message_* routines. */ void otrl_message_free(char *message) { - free(message); + free(message); } /* Handle a message about to be sent to the network. It is safe to pass @@ -55,544 +169,654 @@ void otrl_message_free(char *message) * pointer to the new ConnContext. You can use this to add * application-specific information to the ConnContext using the * "context->app" field, for example. If you don't need to do this, you - * can pass NULL for the last two arguments of otrl_message_sending. + * can pass NULL for the last two arguments of otrl_message_sending. * * tlvs is a chain of OtrlTLVs to append to the private message. It is * usually correct to just pass NULL here. * - * If this routine returns non-zero, then the library tried to encrypt - * the message, but for some reason failed. DO NOT send the message in - * the clear in that case. - * - * If *messagep gets set by the call to something non-NULL, then you - * should replace your message with the contents of *messagep, and - * send that instead. Call otrl_message_free(*messagep) when you're + * If non-NULL, ops->convert_msg will be called just before encrypting a + * message. + * + * "instag" specifies the instance tag of the buddy (protocol version 3 only). + * Meta-instances may also be specified (e.g., OTRL_INSTAG_MOST_SECURE). + * If "contextp" is not NULL, it will be set to the ConnContext used for + * sending the message. + * + * If no fragmentation or msg injection is wanted, use OTRL_FRAGMENT_SEND_SKIP + * as the OtrlFragmentPolicy. In this case, this function will assign *messagep + * with the encrypted msg. If the routine returns non-zero, then the library + * tried to encrypt the message, but for some reason failed. DO NOT send the + * message in the clear in that case. If *messagep gets set by the call to + * something non-NULL, then you should replace your message with the contents + * of *messagep, and send that instead. + * + * Other fragmentation policies are OTRL_FRAGMENT_SEND_ALL, + * OTRL_FRAGMENT_SEND_ALL_BUT_LAST, or OTRL_FRAGMENT_SEND_ALL_BUT_FIRST. In + * these cases, the appropriate fragments will be automatically sent. For the + * last two policies, the remaining fragment will be passed in *original_msg. + * + * Call otrl_message_free(*messagep) if you don't need *messagep or when you're * done with it. */ gcry_error_t otrl_message_sending(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, - const char *recipient, const char *message, OtrlTLV *tlvs, - char **messagep, + const char *recipient, otrl_instag_t their_instag, + const char *original_msg, OtrlTLV *tlvs, char **messagep, + OtrlFragmentPolicy fragPolicy, ConnContext **contextp, void (*add_appdata)(void *data, ConnContext *context), void *data) { - struct context * context; - char * msgtosend; - gcry_error_t err; - OtrlPolicy policy = OTRL_POLICY_DEFAULT; - int context_added = 0; - + ConnContext * context = NULL; + char * msgtosend; + const char * err_msg; + gcry_error_t err_code, err; + OtrlPolicy policy = OTRL_POLICY_DEFAULT; + int context_added = 0; + int convert_called = 0; + char *converted_msg = NULL; + + if (messagep) { *messagep = NULL; + } + + err = gcry_error(GPG_ERR_NO_ERROR); /* Default to no error */ - if (!accountname || !protocol || !recipient || !message || !messagep) - return gcry_error(GPG_ERR_NO_ERROR); + if (contextp) { + *contextp = NULL; + } - /* See if we have a fingerprint for this user */ - context = otrl_context_find(us, recipient, accountname, protocol, - 1, &context_added, add_appdata, data); + if (!accountname || !protocol || !recipient || + !original_msg || !messagep) { + err = gcry_error(GPG_ERR_INV_VALUE); + goto fragment; + } - /* Update the context list if we added one */ - if (context_added && ops->update_context_list) { + /* See if we have a fingerprint for this user */ + context = otrl_context_find(us, recipient, accountname, protocol, + their_instag, 1, &context_added, add_appdata, data); + + /* Update the context list if we added one */ + if (context_added && ops->update_context_list) { ops->update_context_list(opdata); - } + } - /* Check the policy */ - if (ops->policy) { - policy = ops->policy(opdata, context); - } + /* Find or generate the instance tag if needed */ + if (!context->our_instance) { + populate_context_instag(us, ops, opdata, accountname, protocol, + context); + } + + if (contextp) { + *contextp = context; + } - /* Should we go on at all? */ - if ((policy & OTRL_POLICY_VERSION_MASK) == 0) { - return gcry_error(GPG_ERR_NO_ERROR); + /* Check the policy */ + if (ops->policy) { + policy = ops->policy(opdata, context); + } + + /* Should we go on at all? */ + if ((policy & OTRL_POLICY_VERSION_MASK) == 0) { + err = gcry_error(GPG_ERR_NO_ERROR); + goto fragment; + } + +#if OTRL_DEBUGGING + /* If the user typed the magic debug string, dump this context and + * its siblings. */ + { + const char *debugtag = strstr(original_msg, OTRL_DEBUGGING_DEBUGSTR); + + if (debugtag) { + const char *debugargs = + debugtag + strlen(OTRL_DEBUGGING_DEBUGSTR); + if (debugargs[0] == '!') { /* typed ?OTR!! */ + otrl_context_all_dump(stderr, us); + } else { /* typed ?OTR! without extra command chars */ + otrl_context_siblings_dump(stderr, context); + } + + /* Don't actually send the message */ + *messagep = strdup(""); + if (!(*messagep)) { + err = gcry_error(GPG_ERR_ENOMEM); + } + goto fragment; } + } +#endif - /* If this is an OTR Query message, don't encrypt it. */ - if (otrl_proto_message_type(message) == OTRL_MSGTYPE_QUERY) { + /* If this is an OTR Query message, don't encrypt it. */ + if (otrl_proto_message_type(original_msg) == OTRL_MSGTYPE_QUERY) { /* Replace the "?OTR?" with a custom message */ char *bettermsg = otrl_proto_default_query_msg(accountname, policy); if (bettermsg) { - *messagep = bettermsg; - } - return gcry_error(GPG_ERR_NO_ERROR); + *messagep = bettermsg; } + context->otr_offer = OFFER_SENT; + err = gcry_error(GPG_ERR_NO_ERROR); + goto fragment; + } + + /* What is the current message disposition? */ + switch(context->msgstate) { - /* What is the current message disposition? */ - switch(context->msgstate) { case OTRL_MSGSTATE_PLAINTEXT: - if ((policy & OTRL_POLICY_REQUIRE_ENCRYPTION)) { + if ((policy & OTRL_POLICY_REQUIRE_ENCRYPTION)) { /* We're trying to send an unencrypted message with a policy * that disallows that. Don't do that, but try to start * up OTR instead. */ - if ((!(ops->display_otr_message) || - ops->display_otr_message(opdata, accountname, - protocol, recipient, "Attempting to start a " - "private conversation...")) && ops->notify) { - const char *format = "You attempted to send an " - "unencrypted message to %s"; - char *primary = malloc(strlen(format) + - strlen(recipient) - 1); - if (primary) { - sprintf(primary, format, recipient); - ops->notify(opdata, OTRL_NOTIFY_WARNING, accountname, - protocol, recipient, "OTR Policy Violation", - primary, - "Unencrypted messages to this recipient are " - "not allowed. Attempting to start a private " - "conversation.\n\nYour message will be " - "retransmitted when the private conversation " - "starts."); - free(primary); - } + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_ENCRYPTION_REQUIRED, + context, NULL, gcry_error(GPG_ERR_NO_ERROR)); } - context->lastmessage = gcry_malloc_secure(strlen(message) + 1); - if (context->lastmessage) { - char *bettermsg = otrl_proto_default_query_msg(accountname, - policy); - strcpy(context->lastmessage, message); - context->lastsent = time(NULL); - context->may_retransmit = 2; - if (bettermsg) { + + context->context_priv->lastmessage = + gcry_malloc_secure(strlen(original_msg) + 1); + if (context->context_priv->lastmessage) { + char *bettermsg = otrl_proto_default_query_msg(accountname, + policy); + strcpy(context->context_priv->lastmessage, original_msg); + context->context_priv->lastsent = time(NULL); + otrl_context_update_recent_child(context, 1); + context->context_priv->may_retransmit = 2; + if (bettermsg) { *messagep = bettermsg; - } else { - return gcry_error(GPG_ERR_ENOMEM); - } + context->otr_offer = OFFER_SENT; + } else { + err = gcry_error(GPG_ERR_ENOMEM); + goto fragment; + } } - } else { + } else { if ((policy & OTRL_POLICY_SEND_WHITESPACE_TAG) && context->otr_offer != OFFER_REJECTED) { - /* See if this user can speak OTR. Append the - * OTR_MESSAGE_TAG to the plaintext message, and see - * if he responds. */ - size_t msglen = strlen(message); - size_t basetaglen = strlen(OTRL_MESSAGE_TAG_BASE); - size_t v1taglen = (policy & OTRL_POLICY_ALLOW_V1) ? + /* See if this user can speak OTR. Append the + * OTR_MESSAGE_TAG to the plaintext message, and see + * if he responds. */ + size_t msglen = strlen(original_msg); + size_t basetaglen = strlen(OTRL_MESSAGE_TAG_BASE); + size_t v1taglen = (policy & OTRL_POLICY_ALLOW_V1) ? strlen(OTRL_MESSAGE_TAG_V1) : 0; - size_t v2taglen = (policy & OTRL_POLICY_ALLOW_V2) ? + size_t v2taglen = (policy & OTRL_POLICY_ALLOW_V2) ? strlen(OTRL_MESSAGE_TAG_V2) : 0; - char *taggedmsg = malloc(msglen + basetaglen + v1taglen - +v2taglen + 1); - if (taggedmsg) { - strcpy(taggedmsg, message); + size_t v3taglen = (policy & OTRL_POLICY_ALLOW_V3) ? + strlen(OTRL_MESSAGE_TAG_V3) : 0; + char *taggedmsg = malloc(msglen + basetaglen + v1taglen + + v2taglen + v3taglen + 1); + if (taggedmsg) { + strcpy(taggedmsg, original_msg); strcpy(taggedmsg + msglen, OTRL_MESSAGE_TAG_BASE); if (v1taglen) { - strcpy(taggedmsg + msglen + basetaglen, - OTRL_MESSAGE_TAG_V1); + strcpy(taggedmsg + msglen + basetaglen, + OTRL_MESSAGE_TAG_V1); } if (v2taglen) { - strcpy(taggedmsg + msglen + basetaglen + v1taglen, - OTRL_MESSAGE_TAG_V2); - } - *messagep = taggedmsg; - if (context) { - context->otr_offer = OFFER_SENT; + strcpy(taggedmsg + msglen + basetaglen + v1taglen, + OTRL_MESSAGE_TAG_V2); } + if (v3taglen) { + strcpy(taggedmsg + msglen + basetaglen + v1taglen + + v2taglen, OTRL_MESSAGE_TAG_V3); } + *messagep = taggedmsg; + context->otr_offer = OFFER_SENT; + } } - } - break; + } + break; case OTRL_MSGSTATE_ENCRYPTED: - /* Create the new, encrypted message */ - err = otrl_proto_create_data(&msgtosend, context, message, tlvs, - 0); - if (!err) { - context->lastsent = time(NULL); + /* convert the original message if necessary */ + if (ops->convert_msg) { + ops->convert_msg(opdata, context, OTRL_CONVERT_SENDING, + &converted_msg, original_msg); + + if (converted_msg) { + convert_called = 1; + } + } + + /* Create the new, encrypted message */ + if (convert_called) { + err_code = otrl_proto_create_data(&msgtosend, context, + converted_msg, tlvs, 0, NULL); + + if (ops->convert_free) { + ops->convert_free(opdata, context, converted_msg); + converted_msg = NULL; + } + } else { + err_code = otrl_proto_create_data(&msgtosend, context, + original_msg, tlvs, 0, NULL); + } + if (!err_code) { + context->context_priv->lastsent = time(NULL); + otrl_context_update_recent_child(context, 1); *messagep = msgtosend; - } else { + } else { /* Uh, oh. Whatever we do, *don't* send the message in the * clear. */ - *messagep = _strdup("?OTR Error: Error occurred encrypting " - "message"); - if ((!(ops->display_otr_message) || - ops->display_otr_message(opdata, accountname, - protocol, recipient, "An error occurred when " - "encrypting your message. The message was not " - "sent.")) && ops->notify) { - ops->notify(opdata, OTRL_NOTIFY_ERROR, - accountname, protocol, recipient, - "Error encrypting message", - "An error occurred when encrypting your message", - "The message was not sent."); - } - if (!(*messagep)) { - return gcry_error(GPG_ERR_ENOMEM); + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_ENCRYPTION_ERROR, + context, NULL, gcry_error(GPG_ERR_NO_ERROR)); } + if (ops->otr_error_message) { + err_msg = ops->otr_error_message(opdata, context, + OTRL_ERRCODE_ENCRYPTION_ERROR); + *messagep = malloc(strlen(OTR_ERROR_PREFIX) + + strlen(err_msg) + 1); + if (*messagep) { + strcpy(*messagep, OTR_ERROR_PREFIX); + strcat(*messagep, err_msg); + } + if (ops->otr_error_message_free) { + ops->otr_error_message_free(opdata, err_msg); + } + if (!(*messagep)) { + err = gcry_error(GPG_ERR_ENOMEM); + goto fragment; + } } - break; + } + break; case OTRL_MSGSTATE_FINISHED: - *messagep = _strdup(""); - if ((!(ops->display_otr_message) || - ops->display_otr_message(opdata, accountname, - protocol, recipient, "Your message was not sent. " - "Either end your private conversation, or restart " - "it.")) && ops->notify) { - const char *fmt = "%s has already closed his/her private " - "connection to you"; - char *primary = malloc(strlen(fmt) + strlen(recipient) - 1); - if (primary) { - sprintf(primary, fmt, recipient); - ops->notify(opdata, OTRL_NOTIFY_ERROR, - accountname, protocol, recipient, - "Private connection closed", primary, - "Your message was not sent. Either close your " - "private connection to him, or refresh it."); - } - } - if (!(*messagep)) { - return gcry_error(GPG_ERR_ENOMEM); + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, OTRL_MSGEVENT_CONNECTION_ENDED, + context, NULL, gcry_error(GPG_ERR_NO_ERROR)); + } + *messagep = strdup(""); + if (!(*messagep)) { + err = gcry_error(GPG_ERR_ENOMEM); + goto fragment; + } + break; + } + +fragment: + if (fragPolicy == OTRL_FRAGMENT_SEND_SKIP ) { + /* Do not fragment/inject. Default behaviour of libotr3.2.0 */ + return err; + } else { + /* Fragment and send according to policy */ + if (!err && messagep && *messagep) { + if (context) { + char *rmessagep = NULL; + err = fragment_and_send(ops, opdata, context, *messagep, + fragPolicy, &rmessagep); + if (rmessagep) { + /* Free the current message pointer and return back the + * returned fragmented one. */ + free(*messagep); + *messagep = rmessagep; } - break; + } } - - return gcry_error(GPG_ERR_NO_ERROR); + return err; + } } /* If err == 0, send the last auth message for the given context to the * appropriate user. Otherwise, display an appripriate error dialog. * Return the value of err that was passed. */ static gcry_error_t send_or_error_auth(const OtrlMessageAppOps *ops, - void *opdata, gcry_error_t err, ConnContext *context) + void *opdata, gcry_error_t err, ConnContext *context, + OtrlUserState us) { - if (!err) { + if (!err) { const char *msg = context->auth.lastauthmsg; if (msg && *msg) { - otrl_message_fragment_and_send(ops, opdata, context, msg, OTRL_FRAGMENT_SEND_ALL, NULL); - /*if (ops->inject_message) { - ops->inject_message(opdata, context->accountname, - context->protocol, context->username, msg); - }*/ - } - } else { - const char *buf_format = "Error setting up private conversation: %s"; - const char *strerr; - char *buf; - - switch(gcry_err_code(err)) { - case GPG_ERR_INV_VALUE: - strerr = "Malformed message received"; - break; - default: - strerr = gcry_strerror(err); - break; - } - buf = malloc(strlen(buf_format) + strlen(strerr) - 1); - if (buf) { - sprintf(buf, buf_format, strerr); - } - if ((!(ops->display_otr_message) || - ops->display_otr_message(opdata, context->accountname, - context->protocol, context->username, buf)) - && ops->notify) { - ops->notify(opdata, OTRL_NOTIFY_ERROR, context->accountname, - context->protocol, context->username, "OTR error", - buf, NULL); + time_t now; + fragment_and_send(ops, opdata, context, msg, + OTRL_FRAGMENT_SEND_ALL, NULL); + now = time(NULL); + /* Update the "last sent" fields, unless this is a version 3 + * message typing to update the master context (as happens + * when sending a v3 COMMIT message, for example). */ + if (context != context->m_context || + context->auth.protocol_version != 3) { + context->context_priv->lastsent = now; + otrl_context_update_recent_child(context, 1); + } + + /* If this is a master context, and we're sending a v3 COMMIT + * message, update the commit_sent_time timestamp, so we can + * expire it. */ + if (context == context->m_context && + context->auth.authstate == OTRL_AUTHSTATE_AWAITING_DHKEY && + context->auth.protocol_version == 3) { + context->auth.commit_sent_time = now; + /* If there's not already a timer running to clean up + * this private key, try to start one. */ + if (us->timer_running == 0 && ops && ops->timer_control) { + ops->timer_control(opdata, POLL_DEFAULT_INTERVAL); + us->timer_running = 1; + } + } } - free(buf); + } else { + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, OTRL_MSGEVENT_SETUP_ERROR, + context, NULL, err); } - return err; + } + return err; } typedef struct { - int gone_encrypted; - OtrlUserState us; - const OtrlMessageAppOps *ops; - void *opdata; - ConnContext *context; - int ignore_message; - char **messagep; + int gone_encrypted; + OtrlUserState us; + const OtrlMessageAppOps *ops; + void *opdata; + ConnContext *context; + int ignore_message; + char **messagep; } EncrData; static gcry_error_t go_encrypted(const OtrlAuthInfo *auth, void *asdata) { - EncrData *edata = asdata; - gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); - Fingerprint *found_print = NULL; - int fprint_added = 0; - OtrlMessageState oldstate = edata->context->msgstate; - Fingerprint *oldprint = edata->context->active_fingerprint; - - /* See if we're talking to ourselves */ - if (!gcry_mpi_cmp(auth->their_pub, auth->our_dh.pub)) { + EncrData *edata = asdata; + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + Fingerprint *found_print = NULL; + int fprint_added = 0; + OtrlMessageState oldstate = edata->context->msgstate; + Fingerprint *oldprint = edata->context->active_fingerprint; + + /* See if we're talking to ourselves */ + if (!gcry_mpi_cmp(auth->their_pub, auth->our_dh.pub)) { /* Yes, we are. */ - if ((!(edata->ops->display_otr_message) || - edata->ops->display_otr_message(edata->opdata, - edata->context->accountname, edata->context->protocol, - edata->context->username, - "We are receiving our own OTR messages. " - "You are either trying to talk to yourself, " - "or someone is reflecting your messages back " - "at you.")) && edata->ops->notify) { - edata->ops->notify(edata->opdata, OTRL_NOTIFY_ERROR, - edata->context->accountname, edata->context->protocol, - edata->context->username, "OTR Error", - "We are receiving our own OTR messages.", - "You are either trying to talk to yourself, " - "or someone is reflecting your messages back " - "at you."); + if (edata->ops->handle_msg_event) { + edata->ops->handle_msg_event(edata->opdata, + OTRL_MSGEVENT_MSG_REFLECTED, edata->context, + NULL, gcry_error(GPG_ERR_NO_ERROR)); } edata->ignore_message = 1; return gcry_error(GPG_ERR_NO_ERROR); - } + } - found_print = otrl_context_find_fingerprint(edata->context, - edata->context->auth.their_fingerprint, 1, &fprint_added); + found_print = otrl_context_find_fingerprint(edata->context, + edata->context->auth.their_fingerprint, 1, &fprint_added); - if (fprint_added) { + if (fprint_added) { /* Inform the user of the new fingerprint */ if (edata->ops->new_fingerprint) { - edata->ops->new_fingerprint(edata->opdata, edata->us, - edata->context->accountname, edata->context->protocol, - edata->context->username, - edata->context->auth.their_fingerprint); + edata->ops->new_fingerprint(edata->opdata, edata->us, + edata->context->accountname, edata->context->protocol, + edata->context->username, + edata->context->auth.their_fingerprint); } /* Arrange that the new fingerprint be written to disk */ if (edata->ops->write_fingerprints) { - edata->ops->write_fingerprints(edata->opdata); - } + edata->ops->write_fingerprints(edata->opdata); } - - /* Is this a new session or just a refresh of an existing one? */ - if (edata->context->msgstate == OTRL_MSGSTATE_ENCRYPTED && - oldprint == found_print && - edata->context->our_keyid - 1 == edata->context->auth.our_keyid && - !gcry_mpi_cmp(edata->context->our_old_dh_key.pub, + } + + /* Is this a new session or just a refresh of an existing one? */ + if (edata->context->msgstate == OTRL_MSGSTATE_ENCRYPTED && + oldprint == found_print && + edata->context->context_priv->our_keyid - 1 == + edata->context->auth.our_keyid && + !gcry_mpi_cmp(edata->context->context_priv->our_old_dh_key.pub, edata->context->auth.our_dh.pub) && - ((edata->context->their_keyid > 0 && - edata->context->their_keyid == - edata->context->auth.their_keyid && - !gcry_mpi_cmp(edata->context->their_y, + ((edata->context->context_priv->their_keyid > 0 && + edata->context->context_priv->their_keyid == + edata->context->auth.their_keyid && + !gcry_mpi_cmp(edata->context->context_priv->their_y, edata->context->auth.their_pub)) || - (edata->context->their_keyid > 1 && - edata->context->their_keyid - 1 == - edata->context->auth.their_keyid && - edata->context->their_old_y != NULL && - !gcry_mpi_cmp(edata->context->their_old_y, + (edata->context->context_priv->their_keyid > 1 && + edata->context->context_priv->their_keyid - 1 == + edata->context->auth.their_keyid && + edata->context->context_priv->their_old_y != NULL && + !gcry_mpi_cmp(edata->context->context_priv->their_old_y, edata->context->auth.their_pub)))) { /* This is just a refresh of the existing session. */ if (edata->ops->still_secure) { - edata->ops->still_secure(edata->opdata, edata->context, - edata->context->auth.initiated); + edata->ops->still_secure(edata->opdata, edata->context, + edata->context->auth.initiated); } edata->ignore_message = 1; return gcry_error(GPG_ERR_NO_ERROR); - } - - /* Copy the information from the auth into the context */ - memmove(edata->context->sessionid, - edata->context->auth.secure_session_id, 20); - edata->context->sessionid_len = - edata->context->auth.secure_session_id_len; - edata->context->sessionid_half = - edata->context->auth.session_id_half; - edata->context->protocol_version = - edata->context->auth.protocol_version; - - edata->context->their_keyid = edata->context->auth.their_keyid; - gcry_mpi_release(edata->context->their_y); - gcry_mpi_release(edata->context->their_old_y); - edata->context->their_y = gcry_mpi_copy(edata->context->auth.their_pub); - edata->context->their_old_y = NULL; - - if (edata->context->our_keyid - 1 != edata->context->auth.our_keyid || - gcry_mpi_cmp(edata->context->our_old_dh_key.pub, + } + + /* Copy the information from the auth into the context */ + memmove(edata->context->sessionid, + edata->context->auth.secure_session_id, 20); + edata->context->sessionid_len = + edata->context->auth.secure_session_id_len; + edata->context->sessionid_half = + edata->context->auth.session_id_half; + edata->context->protocol_version = + edata->context->auth.protocol_version; + + edata->context->context_priv->their_keyid = + edata->context->auth.their_keyid; + gcry_mpi_release(edata->context->context_priv->their_y); + gcry_mpi_release(edata->context->context_priv->their_old_y); + edata->context->context_priv->their_y = + gcry_mpi_copy(edata->context->auth.their_pub); + edata->context->context_priv->their_old_y = NULL; + + if (edata->context->context_priv->our_keyid - 1 != + edata->context->auth.our_keyid || + gcry_mpi_cmp(edata->context->context_priv->our_old_dh_key.pub, edata->context->auth.our_dh.pub)) { - otrl_dh_keypair_free(&(edata->context->our_dh_key)); - otrl_dh_keypair_free(&(edata->context->our_old_dh_key)); - otrl_dh_keypair_copy(&(edata->context->our_old_dh_key), + otrl_dh_keypair_free(&(edata->context->context_priv->our_dh_key)); + otrl_dh_keypair_free(&(edata->context->context_priv->our_old_dh_key)); + otrl_dh_keypair_copy(&(edata->context->context_priv->our_old_dh_key), &(edata->context->auth.our_dh)); - otrl_dh_gen_keypair(edata->context->our_old_dh_key.groupid, - &(edata->context->our_dh_key)); - edata->context->our_keyid = edata->context->auth.our_keyid + 1; - } - - /* Create the session keys from the DH keys */ - otrl_dh_session_free(&(edata->context->sesskeys[0][0])); - err = otrl_dh_session(&(edata->context->sesskeys[0][0]), - &(edata->context->our_dh_key), edata->context->their_y); - if (err) return err; - otrl_dh_session_free(&(edata->context->sesskeys[1][0])); - err = otrl_dh_session(&(edata->context->sesskeys[1][0]), - &(edata->context->our_old_dh_key), edata->context->their_y); - if (err) return err; - - edata->context->generation++; - edata->context->active_fingerprint = found_print; - edata->context->msgstate = OTRL_MSGSTATE_ENCRYPTED; - - if (edata->ops->update_context_list) { + otrl_dh_gen_keypair( + edata->context->context_priv->our_old_dh_key.groupid, + &(edata->context->context_priv->our_dh_key)); + edata->context->context_priv->our_keyid = edata->context->auth.our_keyid + + 1; + } + + /* Create the session keys from the DH keys */ + otrl_dh_session_free(&(edata->context->context_priv->sesskeys[0][0])); + err = otrl_dh_session(&(edata->context->context_priv->sesskeys[0][0]), + &(edata->context->context_priv->our_dh_key), + edata->context->context_priv->their_y); + if (err) return err; + otrl_dh_session_free(&(edata->context->context_priv->sesskeys[1][0])); + err = otrl_dh_session(&(edata->context->context_priv->sesskeys[1][0]), + &(edata->context->context_priv->our_old_dh_key), + edata->context->context_priv->their_y); + if (err) return err; + + edata->context->context_priv->generation++; + edata->context->active_fingerprint = found_print; + edata->context->msgstate = OTRL_MSGSTATE_ENCRYPTED; + + if (edata->ops->update_context_list) { edata->ops->update_context_list(edata->opdata); - } - if (oldstate == OTRL_MSGSTATE_ENCRYPTED && oldprint == found_print) { + } + if (oldstate == OTRL_MSGSTATE_ENCRYPTED && oldprint == found_print) { if (edata->ops->still_secure) { - edata->ops->still_secure(edata->opdata, edata->context, - edata->context->auth.initiated); + edata->ops->still_secure(edata->opdata, edata->context, + edata->context->auth.initiated); } - } else { + } else { if (edata->ops->gone_secure) { - edata->ops->gone_secure(edata->opdata, edata->context); - } + edata->ops->gone_secure(edata->opdata, edata->context); } + } - edata->gone_encrypted = 1; + edata->gone_encrypted = 1; - return gpg_error(GPG_ERR_NO_ERROR); + return gpg_error(GPG_ERR_NO_ERROR); } static void maybe_resend(EncrData *edata) { - gcry_error_t err; - time_t now; + gcry_error_t err; + time_t now; - if (!edata->gone_encrypted) return; + if (!edata->gone_encrypted) return; - /* See if there's a message we sent recently that should be resent. */ - now = time(NULL); - if (edata->context->lastmessage != NULL && - edata->context->may_retransmit && - edata->context->lastsent >= (now - RESEND_INTERVAL)) { + /* See if there's a message we sent recently that should be resent. */ + now = time(NULL); + if (edata->context->context_priv->lastmessage != NULL && + edata->context->context_priv->may_retransmit && + edata->context->context_priv->lastsent >= (now - RESEND_INTERVAL)) { char *resendmsg; - int resending = (edata->context->may_retransmit == 1); + char *msg_to_send; + int resending = (edata->context->context_priv->may_retransmit == 1); + + /* Initialize msg_to_send */ + if (resending) { + const char *resent_prefix; + int used_ops_resentmp = 1; + resent_prefix = edata->ops->resent_msg_prefix ? + edata->ops->resent_msg_prefix(edata->opdata, + edata->context) : NULL; + if (!resent_prefix) { + resent_prefix = "[resent]"; /* Assign default prefix */ + used_ops_resentmp = 0; + } + msg_to_send = malloc( + strlen(edata->context->context_priv->lastmessage) + + strlen(resent_prefix) + 2); + if (msg_to_send) { + strcpy(msg_to_send, resent_prefix); + strcat(msg_to_send, " "); + strcat(msg_to_send, edata->context->context_priv->lastmessage); + } else { + return; /* Out of memory; don't try to resend */ + } + if (used_ops_resentmp) { + edata->ops->resent_msg_prefix_free(edata->opdata, + resent_prefix); + } + } else { + msg_to_send = edata->context->context_priv->lastmessage; + } /* Re-encrypt the message with the new keys */ err = otrl_proto_create_data(&resendmsg, - edata->context, edata->context->lastmessage, NULL, 0); + edata->context, msg_to_send, NULL, 0, NULL); + if (resending) { + free(msg_to_send); + } if (!err) { - const char *format = "<b>The last message " - "to %s was resent.</b>"; - char *buf; - - /* Resend the message */ - otrl_message_fragment_and_send(edata->ops, edata->opdata, edata->context, resendmsg, OTRL_FRAGMENT_SEND_ALL, NULL); - free(resendmsg); - edata->context->lastsent = now; - - if (!resending) { - /* We're actually just sending it - * for the first time. */ - edata->ignore_message = 1; - } else { - /* Let the user know we resent it */ - buf = malloc(strlen(format) + - strlen(edata->context->username) - 1); - if (buf) { - sprintf(buf, format, edata->context->username); - if (edata->ops->display_otr_message) { - if (!edata->ops->display_otr_message( - edata->opdata, edata->context->accountname, - edata->context->protocol, - edata->context->username, buf)) { - edata->ignore_message = 1; - } - } - if (edata->ignore_message != 1) { - *(edata->messagep) = buf; - edata->ignore_message = 0; - } else { - free(buf); - } - } + /* Resend the message */ + fragment_and_send(edata->ops, edata->opdata, edata->context, + resendmsg, OTRL_FRAGMENT_SEND_ALL, NULL); + free(resendmsg); + edata->context->context_priv->lastsent = now; + otrl_context_update_recent_child(edata->context, 1); + if (resending) { + /* We're not sending it for the first time; let the user + * know we resent it */ + if (edata->ops->handle_msg_event) { + edata->ops->handle_msg_event(edata->opdata, + OTRL_MSGEVENT_MSG_RESENT, edata->context, + NULL, gcry_error(GPG_ERR_NO_ERROR)); } + } + edata->ignore_message = 1; } - } + } } /* Set the trust level based on the result of the SMP */ static void set_smp_trust(const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, int trusted) { - otrl_context_set_trust(context->active_fingerprint, trusted ? "smp" : ""); + otrl_context_set_trust(context->active_fingerprint, trusted ? "smp" : ""); - /* Write the new info to disk, redraw the ui, and redraw the - * OTR buttons. */ - if (ops->write_fingerprints) { + /* Write the new info to disk, redraw the ui, and redraw the + * OTR buttons. */ + if (ops->write_fingerprints) { ops->write_fingerprints(opdata); - } + } } static void init_respond_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, const char *question, const unsigned char *secret, size_t secretlen, int initiating) { - unsigned char *smpmsg = NULL; - int smpmsglen; - unsigned char combined_secret[SM_DIGEST_SIZE]; - gcry_error_t err; - unsigned char our_fp[20]; - unsigned char *combined_buf; - size_t combined_buf_len; - OtrlTLV *sendtlv; - char *sendsmp = NULL; - - if (!context || context->msgstate != OTRL_MSGSTATE_ENCRYPTED) return; - - /* - * Construct the combined secret as a SHA256 hash of: - * Version byte (0x01), Initiator fingerprint (20 bytes), - * responder fingerprint (20 bytes), secure session id, input secret - */ - otrl_privkey_fingerprint_raw(us, our_fp, context->accountname, - context->protocol); - - combined_buf_len = 41 + context->sessionid_len + secretlen; - combined_buf = malloc(combined_buf_len); - combined_buf[0] = 0x01; - if (initiating) { + unsigned char *smpmsg = NULL; + int smpmsglen; + unsigned char combined_secret[SM_DIGEST_SIZE]; + gcry_error_t err; + unsigned char our_fp[20]; + unsigned char *combined_buf; + size_t combined_buf_len; + OtrlTLV *sendtlv; + char *sendsmp = NULL; + + if (!context || context->msgstate != OTRL_MSGSTATE_ENCRYPTED) return; + + /* + * Construct the combined secret as a SHA256 hash of: + * Version byte (0x01), Initiator fingerprint (20 bytes), + * responder fingerprint (20 bytes), secure session id, input secret + */ + otrl_privkey_fingerprint_raw(us, our_fp, context->accountname, + context->protocol); + + combined_buf_len = 41 + context->sessionid_len + secretlen; + combined_buf = malloc(combined_buf_len); + combined_buf[0] = 0x01; + if (initiating) { memmove(combined_buf + 1, our_fp, 20); memmove(combined_buf + 21, context->active_fingerprint->fingerprint, 20); - } else { + } else { memmove(combined_buf + 1, context->active_fingerprint->fingerprint, 20); memmove(combined_buf + 21, our_fp, 20); - } - memmove(combined_buf + 41, context->sessionid, - context->sessionid_len); - memmove(combined_buf + 41 + context->sessionid_len, - secret, secretlen); - gcry_md_hash_buffer(SM_HASH_ALGORITHM, combined_secret, combined_buf, - combined_buf_len); - free(combined_buf); - - if (initiating) { + } + memmove(combined_buf + 41, context->sessionid, + context->sessionid_len); + memmove(combined_buf + 41 + context->sessionid_len, + secret, secretlen); + gcry_md_hash_buffer(SM_HASH_ALGORITHM, combined_secret, combined_buf, + combined_buf_len); + free(combined_buf); + + if (initiating) { otrl_sm_step1(context->smstate, combined_secret, SM_DIGEST_SIZE, &smpmsg, &smpmsglen); - } else { + } else { otrl_sm_step2b(context->smstate, combined_secret, SM_DIGEST_SIZE, &smpmsg, &smpmsglen); - } + } - /* If we've got a question, attach it to the smpmsg */ - if (question != NULL) { + /* If we've got a question, attach it to the smpmsg */ + if (question != NULL) { size_t qlen = strlen(question); unsigned char *qsmpmsg = malloc(qlen + 1 + smpmsglen); if (!qsmpmsg) { - free(smpmsg); - return; + free(smpmsg); + return; } strcpy((char *)qsmpmsg, question); memmove(qsmpmsg + qlen + 1, smpmsg, smpmsglen); free(smpmsg); smpmsg = qsmpmsg; smpmsglen += qlen + 1; - } - - /* Send msg with next smp msg content */ - sendtlv = otrl_tlv_new(initiating ? - (question != NULL ? OTRL_TLV_SMP1Q : OTRL_TLV_SMP1) - : OTRL_TLV_SMP2, - smpmsglen, smpmsg); - err = otrl_proto_create_data(&sendsmp, context, "", sendtlv, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); - if (!err) { - /* Send it, and set the next expected message to the + } + + /* Send msg with next smp msg content */ + sendtlv = otrl_tlv_new(initiating ? + (question != NULL ? OTRL_TLV_SMP1Q : OTRL_TLV_SMP1) + : OTRL_TLV_SMP2, + smpmsglen, smpmsg); + err = otrl_proto_create_data(&sendsmp, context, "", sendtlv, + OTRL_MSGFLAGS_IGNORE_UNREADABLE, NULL); + if (!err) { + /* Send it, and set the next expected message to the * logical response */ - err = otrl_message_fragment_and_send(ops, opdata, context, + err = fragment_and_send(ops, opdata, context, sendsmp, OTRL_FRAGMENT_SEND_ALL, NULL); - context->smstate->nextExpected = + context->smstate->nextExpected = initiating ? OTRL_SMP_EXPECT2 : OTRL_SMP_EXPECT3; - } - free(sendsmp); - otrl_tlv_free(sendtlv); - free(smpmsg); + } + free(sendsmp); + otrl_tlv_free(sendtlv); + free(smpmsg); } /* Initiate the Socialist Millionaires' Protocol */ @@ -600,7 +824,7 @@ void otrl_message_initiate_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, const unsigned char *secret, size_t secretlen) { - init_respond_smp(us, ops, opdata, context, NULL, secret, secretlen, 1); + init_respond_smp(us, ops, opdata, context, NULL, secret, secretlen, 1); } /* Initiate the Socialist Millionaires' Protocol and send a prompt @@ -609,7 +833,7 @@ void otrl_message_initiate_smp_q(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, const char *question, const unsigned char *secret, size_t secretlen) { - init_respond_smp(us, ops, opdata, context, question, secret, secretlen, 1); + init_respond_smp(us, ops, opdata, context, question, secret, secretlen, 1); } /* Respond to a buddy initiating the Socialist Millionaires' Protocol */ @@ -617,7 +841,7 @@ void otrl_message_respond_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, const unsigned char *secret, size_t secretlen) { - init_respond_smp(us, ops, opdata, context, NULL, secret, secretlen, 0); + init_respond_smp(us, ops, opdata, context, NULL, secret, secretlen, 0); } /* Abort the SMP. Called when an unexpected SMP message breaks the @@ -625,25 +849,55 @@ void otrl_message_respond_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void otrl_message_abort_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context) { - OtrlTLV *sendtlv = otrl_tlv_new(OTRL_TLV_SMP_ABORT, 0, - (const unsigned char *)""); - char *sendsmp = NULL; - gcry_error_t err; - - context->smstate->nextExpected = OTRL_SMP_EXPECT1; + OtrlTLV *sendtlv = otrl_tlv_new(OTRL_TLV_SMP_ABORT, 0, + (const unsigned char *)""); + char *sendsmp = NULL; + gcry_error_t err; - err = otrl_proto_create_data(&sendsmp, - context, "", sendtlv, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); - if (!err) { + context->smstate->nextExpected = OTRL_SMP_EXPECT1; + + err = otrl_proto_create_data(&sendsmp, + context, "", sendtlv, + OTRL_MSGFLAGS_IGNORE_UNREADABLE, NULL); + if (!err) { /* Send the abort signal so our buddy knows we've stopped */ - err = otrl_message_fragment_and_send(ops, opdata, context, + err = fragment_and_send(ops, opdata, context, sendsmp, OTRL_FRAGMENT_SEND_ALL, NULL); + } + free(sendsmp); + otrl_tlv_free(sendtlv); +} + +static void message_malformed(const OtrlMessageAppOps *ops, + void *opdata, ConnContext *context) { + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, OTRL_MSGEVENT_RCVDMSG_MALFORMED, context, + NULL, gcry_error(GPG_ERR_NO_ERROR)); + } + + if (ops->inject_message && ops->otr_error_message) { + const char *err_msg = ops->otr_error_message(opdata, context, + OTRL_ERRCODE_MSG_MALFORMED); + + if (err_msg) { + char *buf = malloc(strlen(OTR_ERROR_PREFIX) + strlen(err_msg) + 1); + + if (buf) { + strcpy(buf, OTR_ERROR_PREFIX); + strcat(buf, err_msg); + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, buf); + free(buf); + } + + if (ops->otr_error_message_free) { + ops->otr_error_message_free(opdata, err_msg); + } } - free(sendsmp); - otrl_tlv_free(sendtlv); + } } + /* Handle a message just received from the network. It is safe to pass * all received messages to this routine. add_appdata is a function * that will be called in the event that a new ConnContext is created. @@ -651,7 +905,13 @@ void otrl_message_abort_smp(OtrlUserState us, const OtrlMessageAppOps *ops, * a pointer to the new ConnContext. You can use this to add * application-specific information to the ConnContext using the * "context->app" field, for example. If you don't need to do this, you - * can pass NULL for the last two arguments of otrl_message_receiving. + * can pass NULL for the last two arguments of otrl_message_receiving. + * + * If non-NULL, ops->convert_msg will be called after a data message is + * decrypted. + * + * If "contextp" is not NULL, it will be set to the ConnContext used for + * receiving the message. * * If otrl_message_receiving returns 1, then the message you received * was an internal protocol message, and no message should be delivered @@ -671,776 +931,1129 @@ void otrl_message_abort_smp(OtrlUserState us, const OtrlMessageAppOps *ops, int otrl_message_receiving(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, const char *sender, const char *message, char **newmessagep, - OtrlTLV **tlvsp, + OtrlTLV **tlvsp, ConnContext **contextp, void (*add_appdata)(void *data, ConnContext *context), void *data) { - ConnContext *context; - OtrlMessageType msgtype; - int context_added = 0; - OtrlMessageState msgstate; - OtrlPolicy policy = OTRL_POLICY_DEFAULT; - int fragment_assembled = 0; - char *unfragmessage = NULL; - EncrData edata; - - if (!accountname || !protocol || !sender || !message || !newmessagep) - return 0; - - *newmessagep = NULL; - if (tlvsp) *tlvsp = NULL; - - /* Find our context and state with this correspondent */ - context = otrl_context_find(us, sender, accountname, - protocol, 1, &context_added, add_appdata, data); - - /* Update the context list if we added one */ - if (context_added && ops->update_context_list) { + ConnContext *context, *m_context, *best_context; + OtrlMessageType msgtype; + int context_added = 0; + OtrlPolicy policy = OTRL_POLICY_DEFAULT; + char *unfragmessage = NULL, *otrtag = NULL; + EncrData edata; + otrl_instag_t our_instance = 0, their_instance = 0; + int version; + gcry_error_t err; + + if (!accountname || !protocol || !sender || !message || !newmessagep) + return 0; + + *newmessagep = NULL; + if (tlvsp) *tlvsp = NULL; + + if (contextp) { + *contextp = NULL; + } + + /* Find the master context and state with this correspondent */ + m_context = otrl_context_find(us, sender, accountname, + protocol, OTRL_INSTAG_MASTER, 1, &context_added, add_appdata, data); + context = m_context; + + /* Update the context list if we added one */ + if (context_added && ops->update_context_list) { ops->update_context_list(opdata); - } + } - /* Check the policy */ - if (ops->policy) { - policy = ops->policy(opdata, context); - } + best_context = otrl_context_find(us, sender, accountname, + protocol, OTRL_INSTAG_BEST, 0, NULL, add_appdata, data); + + /* Find or generate the instance tag if needed */ + if (!context->our_instance) { + populate_context_instag(us, ops, opdata, accountname, protocol, + context); + } - /* Should we go on at all? */ - if ((policy & OTRL_POLICY_VERSION_MASK) == 0) { - return 0; - } - /* See if we have a fragment */ - switch(otrl_proto_fragment_accumulate(&unfragmessage, context, message)) { - case OTRL_FRAGMENT_UNFRAGMENTED: + /* Check the policy */ + if (ops->policy) { + policy = ops->policy(opdata, context); + } + + /* Should we go on at all? */ + if ((policy & OTRL_POLICY_VERSION_MASK) == 0) { + return 0; + } + + otrtag = strstr(message, "?OTR"); + if (otrtag) { + /* See if we have a V3 fragment. The '4' in the next line is + * strlen("?OTR"). otrtag[4] is the character immediately after + * the "?OTR", and is guaranteed to exist, because in the worst + * case, it is the NUL terminating 'message'. */ + if (otrtag[4] == '|') { + /* Get the instance tag from fragment header*/ + sscanf(otrtag, "?OTR|%x|%x,", &their_instance, &our_instance); + /* Ignore message if it is intended for a different instance */ + if (our_instance && context->our_instance != our_instance) { + + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE, + m_context, NULL, gcry_error(GPG_ERR_NO_ERROR)); + } + return 1; + } + /* Get the context for this instance */ + if (their_instance >= OTRL_MIN_VALID_INSTAG) { + context = otrl_context_find(us, sender, accountname, + protocol, their_instance, 1, &context_added, + add_appdata, data); + } else { + message_malformed(ops, opdata, context); + return 1; + } + } + switch(otrl_proto_fragment_accumulate(&unfragmessage, + context, message)) { + case OTRL_FRAGMENT_UNFRAGMENTED: /* Do nothing */ break; - case OTRL_FRAGMENT_INCOMPLETE: + case OTRL_FRAGMENT_INCOMPLETE: /* We've accumulated this fragment, but we don't have a * complete message yet */ return 1; - case OTRL_FRAGMENT_COMPLETE: + case OTRL_FRAGMENT_COMPLETE: /* We've got a new complete message, in unfragmessage. */ - fragment_assembled = 1; message = unfragmessage; + otrtag = strstr(message, "?OTR"); break; } + } - /* What type of message is it? Note that this just checks the - * header; it's not necessarily a _valid_ message of this type. */ - msgtype = otrl_proto_message_type(message); - msgstate = context->msgstate; + /* What type of message is it? Note that this just checks the + * header; it's not necessarily a _valid_ message of this type. */ + msgtype = otrl_proto_message_type(message); + version = otrl_proto_message_version(message); - /* See if they responded to our OTR offer */ - if ((policy & OTRL_POLICY_SEND_WHITESPACE_TAG)) { + /* See if they responded to our OTR offer */ + if ((policy & OTRL_POLICY_SEND_WHITESPACE_TAG)) { if (msgtype != OTRL_MSGTYPE_NOTOTR) { - context->otr_offer = OFFER_ACCEPTED; + context->otr_offer = OFFER_ACCEPTED; } else if (context->otr_offer == OFFER_SENT) { - context->otr_offer = OFFER_REJECTED; + context->otr_offer = OFFER_REJECTED; } + } + + /* Check that this version is allowed by the policy */ + if (((version == 3) && !(policy & OTRL_POLICY_ALLOW_V3)) + || ((version == 2) && !(policy & OTRL_POLICY_ALLOW_V2)) + || ((version == 1) && !(policy & OTRL_POLICY_ALLOW_V1))) { + edata.ignore_message = 1; + goto end; + } + /* Check the to and from instance tags */ + if (version == 3) { + err = gcry_error(GPG_ERR_INV_VALUE); + if (otrtag) { + err = otrl_proto_instance(otrtag, &their_instance, &our_instance); + } + if (!err) { + if ((msgtype == OTRL_MSGTYPE_DH_COMMIT && our_instance && + context->our_instance != our_instance) || + (msgtype != OTRL_MSGTYPE_DH_COMMIT && + context->our_instance != our_instance)) { + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE, + m_context, NULL, gcry_error(GPG_ERR_NO_ERROR)); + } + /* ignore message intended for a different instance */ + edata.ignore_message = 1; + goto end; + } + + if (their_instance >= OTRL_MIN_VALID_INSTAG) { + context = otrl_context_find(us, sender, accountname, + protocol, their_instance, 1, &context_added, + add_appdata, data); + } } - edata.gone_encrypted = 0; - edata.us = us; - edata.context = context; - edata.ops = ops; - edata.opdata = opdata; - edata.ignore_message = -1; - edata.messagep = newmessagep; + if (err || their_instance < OTRL_MIN_VALID_INSTAG) { + message_malformed(ops, opdata, context); + edata.ignore_message = 1; + goto end; + } + + if (context_added) { + /* Context added because of new instance (either here or when + * accumulating fragments */ + /* Copy information from m_context to the new instance context */ + context->auth.protocol_version = 3; + context->protocol_version = 3; + context->msgstate = m_context->msgstate; + + if (m_context->context_priv->may_retransmit) { + gcry_free(context->context_priv->lastmessage); + context->context_priv->lastmessage = m_context->context_priv->lastmessage; + m_context->context_priv->lastmessage = NULL; + context->context_priv->may_retransmit = m_context->context_priv->may_retransmit; + m_context->context_priv->may_retransmit = 0; + } + + if (msgtype == OTRL_MSGTYPE_DH_KEY) { + otrl_auth_copy_on_key(&(m_context->auth), &(context->auth)); + } else if (msgtype != OTRL_MSGTYPE_DH_COMMIT) { + edata.ignore_message = 1; + goto end; + } + + /* Update the context list */ + if (ops->update_context_list) { + ops->update_context_list(opdata); + } + } else if (m_context != context) { + /* Switching from m_context to existing instance context */ + if (msgtype == OTRL_MSGTYPE_DH_KEY && m_context->auth.authstate + == OTRL_AUTHSTATE_AWAITING_DHKEY && + !(context->auth.authstate == + OTRL_AUTHSTATE_AWAITING_DHKEY)) { + context->msgstate = m_context->msgstate; + context->auth.protocol_version = 3; + context->protocol_version = 3; + otrl_auth_copy_on_key(&(m_context->auth), &(context->auth)); + } + } + } - switch(msgtype) { + if (contextp) { + *contextp = context; + } + + /* update time of last received message */ + context->context_priv->lastrecv = time(NULL); + otrl_context_update_recent_child(context, 0); + + edata.gone_encrypted = 0; + edata.us = us; + edata.context = context; + edata.ops = ops; + edata.opdata = opdata; + edata.ignore_message = -1; + edata.messagep = newmessagep; + + switch(msgtype) { unsigned int bestversion; const char *startwhite, *endwhite; DH_keypair *our_dh; unsigned int our_keyid; OtrlPrivKey *privkey; - gcry_error_t err; int haveauthmsg; + case OTRL_MSGTYPE_QUERY: - /* See if we should use an existing DH keypair, or generate - * a fresh one. */ - if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { - our_dh = &(context->our_old_dh_key); - our_keyid = context->our_keyid - 1; - } else { + /* See if we should use an existing DH keypair, or generate + * a fresh one. */ + if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { + our_dh = &(context->context_priv->our_old_dh_key); + our_keyid = context->context_priv->our_keyid - 1; + } else { our_dh = NULL; our_keyid = 0; - } - - /* Find the best version of OTR that we both speak */ - switch(otrl_proto_query_bestversion(message, policy)) { + } + + /* Find the best version of OTR that we both speak */ + switch(otrl_proto_query_bestversion(message, policy)) { + case 3: + err = otrl_auth_start_v23(&(context->auth), 3); + send_or_error_auth(ops, opdata, err, context, us); + break; case 2: - err = otrl_auth_start_v2(&(context->auth)); - send_or_error_auth(ops, opdata, err, context); - break; + err = otrl_auth_start_v23(&(context->auth), 2); + send_or_error_auth(ops, opdata, err, context, us); + break; case 1: - /* Get our private key */ - privkey = otrl_privkey_find(us, context->accountname, - context->protocol); - if (privkey == NULL) { + /* Get our private key */ + privkey = otrl_privkey_find(us, context->accountname, + context->protocol); + if (privkey == NULL) { /* We've got no private key! */ if (ops->create_privkey) { - ops->create_privkey(opdata, context->accountname, - context->protocol); - privkey = otrl_privkey_find(us, - context->accountname, context->protocol); - } + ops->create_privkey(opdata, context->accountname, + context->protocol); + privkey = otrl_privkey_find(us, + context->accountname, context->protocol); } - if (privkey) { + } + if (privkey) { err = otrl_auth_start_v1(&(context->auth), our_dh, our_keyid, privkey); - send_or_error_auth(ops, opdata, err, context); - } - break; + send_or_error_auth(ops, opdata, err, context, us); + } + break; default: - /* Just ignore this message */ - break; - } - /* Don't display the Query message to the user. */ - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + /* Just ignore this message */ + break; + } + /* Don't display the Query message to the user. */ + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; case OTRL_MSGTYPE_DH_COMMIT: - if ((policy & OTRL_POLICY_ALLOW_V2)) { - err = otrl_auth_handle_commit(&(context->auth), message); - send_or_error_auth(ops, opdata, err, context); - } + err = otrl_auth_handle_commit(&(context->auth), otrtag, version); + send_or_error_auth(ops, opdata, err, context, us); - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; case OTRL_MSGTYPE_DH_KEY: - if ((policy & OTRL_POLICY_ALLOW_V2)) { - /* Get our private key */ - privkey = otrl_privkey_find(us, context->accountname, - context->protocol); - if (privkey == NULL) { - /* We've got no private key! */ - if (ops->create_privkey) { - ops->create_privkey(opdata, context->accountname, - context->protocol); - privkey = otrl_privkey_find(us, - context->accountname, context->protocol); - } - } - if (privkey) { - err = otrl_auth_handle_key(&(context->auth), message, - &haveauthmsg, privkey); - if (err || haveauthmsg) { - send_or_error_auth(ops, opdata, err, context); - } + /* Get our private key */ + privkey = otrl_privkey_find(us, context->accountname, + context->protocol); + if (privkey == NULL) { + /* We've got no private key! */ + if (ops->create_privkey) { + ops->create_privkey(opdata, context->accountname, + context->protocol); + privkey = otrl_privkey_find(us, + context->accountname, context->protocol); } + } + if (privkey) { + err = otrl_auth_handle_key(&(context->auth), otrtag, + &haveauthmsg, privkey); + if (err || haveauthmsg) { + send_or_error_auth(ops, opdata, err, context, us); } + } - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; case OTRL_MSGTYPE_REVEALSIG: - if ((policy & OTRL_POLICY_ALLOW_V2)) { - /* Get our private key */ - privkey = otrl_privkey_find(us, context->accountname, - context->protocol); - if (privkey == NULL) { - /* We've got no private key! */ - if (ops->create_privkey) { - ops->create_privkey(opdata, context->accountname, - context->protocol); - privkey = otrl_privkey_find(us, - context->accountname, context->protocol); - } - } - if (privkey) { - err = otrl_auth_handle_revealsig(&(context->auth), - message, &haveauthmsg, privkey, go_encrypted, - &edata); - if (err || haveauthmsg) { - send_or_error_auth(ops, opdata, err, context); - maybe_resend(&edata); - } + /* Get our private key */ + privkey = otrl_privkey_find(us, context->accountname, + context->protocol); + if (privkey == NULL) { + /* We've got no private key! */ + if (ops->create_privkey) { + ops->create_privkey(opdata, context->accountname, + context->protocol); + privkey = otrl_privkey_find(us, + context->accountname, context->protocol); } + } + if (privkey) { + err = otrl_auth_handle_revealsig(&(context->auth), + otrtag, &haveauthmsg, privkey, go_encrypted, + &edata); + if (err || haveauthmsg) { + send_or_error_auth(ops, opdata, err, context, us); + maybe_resend(&edata); } + } - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; case OTRL_MSGTYPE_SIGNATURE: - if ((policy & OTRL_POLICY_ALLOW_V2)) { - err = otrl_auth_handle_signature(&(context->auth), - message, &haveauthmsg, go_encrypted, &edata); - if (err || haveauthmsg) { - send_or_error_auth(ops, opdata, err, context); - maybe_resend(&edata); - } - } - - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + err = otrl_auth_handle_signature(&(context->auth), + otrtag, &haveauthmsg, go_encrypted, &edata); + if (err || haveauthmsg) { + send_or_error_auth(ops, opdata, err, context, us); + maybe_resend(&edata); + } - case OTRL_MSGTYPE_V1_KEYEXCH: - if ((policy & OTRL_POLICY_ALLOW_V1)) { - /* See if we should use an existing DH keypair, or generate - * a fresh one. */ - if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { - our_dh = &(context->our_old_dh_key); - our_keyid = context->our_keyid - 1; - } else { - our_dh = NULL; - our_keyid = 0; - } + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; - /* Get our private key */ - privkey = otrl_privkey_find(us, context->accountname, - context->protocol); - if (privkey == NULL) { - /* We've got no private key! */ - if (ops->create_privkey) { - ops->create_privkey(opdata, context->accountname, - context->protocol); - privkey = otrl_privkey_find(us, - context->accountname, context->protocol); - } - } - if (privkey) { - err = otrl_auth_handle_v1_key_exchange(&(context->auth), - message, &haveauthmsg, privkey, our_dh, our_keyid, - go_encrypted, &edata); - if (err || haveauthmsg) { - send_or_error_auth(ops, opdata, err, context); - maybe_resend(&edata); - } + case OTRL_MSGTYPE_V1_KEYEXCH: + /* See if we should use an existing DH keypair, or generate + * a fresh one. */ + if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { + our_dh = &(context->context_priv->our_old_dh_key); + our_keyid = context->context_priv->our_keyid - 1; + } else { + our_dh = NULL; + our_keyid = 0; + } + + /* Get our private key */ + privkey = otrl_privkey_find(us, context->accountname, + context->protocol); + if (privkey == NULL) { + /* We've got no private key! */ + if (ops->create_privkey) { + ops->create_privkey(opdata, context->accountname, + context->protocol); + privkey = otrl_privkey_find(us, context->accountname, + context->protocol); } + } + if (privkey) { + err = otrl_auth_handle_v1_key_exchange(&(context->auth), + message, &haveauthmsg, privkey, our_dh, our_keyid, + go_encrypted, &edata); + if (err || haveauthmsg) { + send_or_error_auth(ops, opdata, err, context, us); + maybe_resend(&edata); } - - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; + } + + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; case OTRL_MSGTYPE_DATA: - switch(context->msgstate) { + switch(context->msgstate) { gcry_error_t err; OtrlTLV *tlvs, *tlv; char *plaintext; char *buf; - const char *format; - const char *displayaccountname; + const char *err_msg; + unsigned char *extrakey; unsigned char flags; NextExpectedSMP nextMsg; case OTRL_MSGSTATE_PLAINTEXT: case OTRL_MSGSTATE_FINISHED: - /* See if we're supposed to ignore this message in - * the event it's unreadable. */ - err = otrl_proto_data_read_flags(message, &flags); - if ((flags & OTRL_MSGFLAGS_IGNORE_UNREADABLE)) { + /* See if we're supposed to ignore this message in + * the event it's unreadable. */ + err = otrl_proto_data_read_flags(message, &flags); + if ((flags & OTRL_MSGFLAGS_IGNORE_UNREADABLE)) { edata.ignore_message = 1; break; - } + } - /* Don't use g_strdup_printf here, because someone - * (not us) is going to free() the *newmessagep pointer, - * not g_free() it. */ - format = "<b>The encrypted message received from %s is " - "unreadable, as you are not currently communicating " - "privately.</b>"; - buf = malloc(strlen(format) + strlen(context->username) - - 1); /* Remove "%s", add username + '\0' */ - if (buf) { - sprintf(buf, format, context->username); - if (ops->display_otr_message) { - if (!ops->display_otr_message(opdata, accountname, - protocol, sender, buf)) { - edata.ignore_message = 1; - } - } - if (edata.ignore_message != 1) { - *newmessagep = buf; - edata.ignore_message = 0; - } else { - free(buf); - } - } - format = "?OTR Error: You sent encrypted " - "data to %s, who wasn't expecting it."; - if (otrl_api_version >= 0x00030100 && - ops->account_name) { - displayaccountname = ops->account_name(opdata, - context->accountname, protocol); - } else { - displayaccountname = NULL; - } - buf = malloc(strlen(format) + strlen(displayaccountname ? - displayaccountname : context->accountname) - - 1); - if (buf) { - sprintf(buf, format, displayaccountname ? - displayaccountname : context->accountname); - if (ops->inject_message) { - ops->inject_message(opdata, accountname, protocol, - sender, buf); - } - free(buf); - } - if (displayaccountname && otrl_api_version >= 0x00030100 && - ops->account_name_free) { - ops->account_name_free(opdata, displayaccountname); - } + if(best_context && best_context != context && + best_context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { - break; + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE, + m_context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); + } + } else if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_NOT_IN_PRIVATE, + context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); + } + edata.ignore_message = 1; + + /* We don't actually want to send anything in this case, + since this could just be a message intended for another + v2 instance. We still notify the local user though */ + break; case OTRL_MSGSTATE_ENCRYPTED: - err = otrl_proto_accept_data(&plaintext, &tlvs, context, - message, &flags); - if (err) { + extrakey = gcry_malloc_secure(OTRL_EXTRAKEY_BYTES); + err = otrl_proto_accept_data(&plaintext, &tlvs, context, + message, &flags, extrakey); + if (err) { int is_conflict = (gpg_err_code(err) == GPG_ERR_CONFLICT); if ((flags & OTRL_MSGFLAGS_IGNORE_UNREADABLE)) { - edata.ignore_message = 1; - break; + edata.ignore_message = 1; + break; } - format = is_conflict ? "We received an unreadable " - "encrypted message from %s." : - "We received a malformed data message from %s."; - buf = malloc(strlen(format) + strlen(sender) - 1); - if (buf) { - sprintf(buf, format, sender); - if ((!(ops->display_otr_message) || - ops->display_otr_message(opdata, - accountname, protocol, sender, - buf)) && ops->notify) { - ops->notify(opdata, OTRL_NOTIFY_ERROR, - accountname, protocol, sender, - "OTR Error", buf, NULL); - } - free(buf); + if (is_conflict) { + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_UNREADABLE, + context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); + } + } else { + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_MALFORMED, + context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); + } } - if (ops->inject_message) { - ops->inject_message(opdata, accountname, protocol, - sender, is_conflict ? "?OTR Error: " - "You transmitted an unreadable " - "encrypted message." : - "?OTR Error: You transmitted " - "a malformed data message"); + if (ops->inject_message && ops->otr_error_message) { + err_msg = ops->otr_error_message(opdata, + context, + is_conflict ? + OTRL_ERRCODE_MSG_UNREADABLE : + OTRL_ERRCODE_MSG_MALFORMED); + if (err_msg) { + buf = malloc(strlen(OTR_ERROR_PREFIX) + + strlen(err_msg) + 1); + if (buf) { + strcpy(buf, OTR_ERROR_PREFIX); + strcat(buf, err_msg); + ops->inject_message(opdata, + accountname, protocol, + sender, buf); + free(buf); + } + } + if (ops->otr_error_message_free) { + ops->otr_error_message_free(opdata, + err_msg); + } } edata.ignore_message = 1; break; - } + } - /* If the other side told us he's disconnected his - * private connection, make a note of that so we - * don't try sending anything else to him. */ - if (otrl_tlv_find(tlvs, OTRL_TLV_DISCONNECTED)) { + /* If the other side told us he's disconnected his + * private connection, make a note of that so we + * don't try sending anything else to him. */ + if (otrl_tlv_find(tlvs, OTRL_TLV_DISCONNECTED)) { otrl_context_force_finished(context); + } + + /* If the other side told us to use the current + * extra symmetric key, let the application know. */ + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SYMKEY); + if (tlv && otrl_api_version >= 0x040000) { + if (ops->received_symkey && tlv->len >= 4) { + unsigned char *bufp = tlv->data; + unsigned int use = + (bufp[0] << 24) | (bufp[1] << 16) | + (bufp[2] << 8) | bufp[3]; + ops->received_symkey(opdata, context, use, + bufp+4, tlv->len - 4, extrakey); } - - /* If TLVs contain SMP data, process it */ - nextMsg = context->smstate->nextExpected; - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1Q); - if (tlv && nextMsg == OTRL_SMP_EXPECT1) { - /* We can only do the verification half now. - * We must wait for the secret to be entered - * to continue. */ - char *question = (char *)tlv->data; - char *qend = memchr(question, '\0', tlv->len - 1); - size_t qlen = qend ? (qend - question + 1) : tlv->len; - otrl_sm_step2a(context->smstate, tlv->data + qlen, - tlv->len - qlen, 1); - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1); - if (tlv && nextMsg == OTRL_SMP_EXPECT1) { - /* We can only do the verification half now. - * We must wait for the secret to be entered - * to continue. */ - otrl_sm_step2a(context->smstate, tlv->data, tlv->len, - 0); - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP2); - if (tlv && nextMsg == OTRL_SMP_EXPECT2) { - unsigned char* nextmsg; - int nextmsglen; - OtrlTLV *sendtlv; - char *sendsmp; - otrl_sm_step3(context->smstate, tlv->data, tlv->len, - &nextmsg, &nextmsglen); - - if (context->smstate->sm_prog_state != - OTRL_SMP_PROG_CHEATED) { + } + gcry_free(extrakey); + extrakey = NULL; + + /* If TLVs contain SMP data, process it */ + nextMsg = context->smstate->nextExpected; + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1Q); + if (tlv) { + if (nextMsg == OTRL_SMP_EXPECT1 && tlv->len > 0) { + /* We can only do the verification half now. + * We must wait for the secret to be entered + * to continue. */ + char *question = (char *)tlv->data; + char *qend = memchr(question, '\0', tlv->len - 1); + size_t qlen = qend ? (qend - question + 1) : + tlv->len; + otrl_sm_step2a(context->smstate, tlv->data + qlen, + tlv->len - qlen, 1); + + if (context->smstate->sm_prog_state != + OTRL_SMP_PROG_CHEATED) { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ASK_FOR_ANSWER, + context, 25, question); + } + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_CHEATED, context, + 0, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + context->smstate->sm_prog_state = + OTRL_SMP_PROG_OK; + } + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ERROR, context, + 0, NULL); + } + } + } + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP1); + if (tlv) { + if (nextMsg == OTRL_SMP_EXPECT1) { + /* We can only do the verification half now. + * We must wait for the secret to be entered + * to continue. */ + otrl_sm_step2a(context->smstate, tlv->data, + tlv->len, 0); + if (context->smstate->sm_prog_state != + OTRL_SMP_PROG_CHEATED) { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ASK_FOR_SECRET, + context, 25, NULL); + } + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_CHEATED, + context, 0, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + context->smstate->sm_prog_state = + OTRL_SMP_PROG_OK; + } + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ERROR, context, + 0, NULL); + } + } + } + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP2); + if (tlv) { + if (nextMsg == OTRL_SMP_EXPECT2) { + unsigned char* nextmsg; + int nextmsglen; + OtrlTLV *sendtlv; + char *sendsmp; + otrl_sm_step3(context->smstate, tlv->data, + tlv->len, &nextmsg, &nextmsglen); + + if (context->smstate->sm_prog_state != + OTRL_SMP_PROG_CHEATED) { /* Send msg with next smp msg content */ - sendtlv = otrl_tlv_new(OTRL_TLV_SMP3, nextmsglen, - nextmsg); + sendtlv = otrl_tlv_new(OTRL_TLV_SMP3, + nextmsglen, nextmsg); err = otrl_proto_create_data(&sendsmp, context, "", sendtlv, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); + OTRL_MSGFLAGS_IGNORE_UNREADABLE, + NULL); if (!err) { - err = otrl_message_fragment_and_send(ops, + err = fragment_and_send(ops, opdata, context, sendsmp, OTRL_FRAGMENT_SEND_ALL, NULL); } free(sendsmp); otrl_tlv_free(sendtlv); + + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_IN_PROGRESS, + context, 60, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT4; + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_CHEATED, + context, 0, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + context->smstate->sm_prog_state = + OTRL_SMP_PROG_OK; + } + free(nextmsg); + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ERROR, context, + 0, NULL); + } } - free(nextmsg); - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP3); - if (tlv && nextMsg == OTRL_SMP_EXPECT3) { - unsigned char* nextmsg; - int nextmsglen; - OtrlTLV *sendtlv; - char *sendsmp; - err = otrl_sm_step4(context->smstate, tlv->data, - tlv->len, &nextmsg, &nextmsglen); - /* Set trust level based on result */ - if (context->smstate->received_question == 0) { + } + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP3); + if (tlv) { + if (nextMsg == OTRL_SMP_EXPECT3) { + unsigned char* nextmsg; + int nextmsglen; + OtrlTLV *sendtlv; + char *sendsmp; + err = otrl_sm_step4(context->smstate, tlv->data, + tlv->len, &nextmsg, &nextmsglen); + /* Set trust level based on result */ + if (context->smstate->received_question == 0) { set_smp_trust(ops, opdata, context, (err == gcry_error(GPG_ERR_NO_ERROR))); - } - - if (context->smstate->sm_prog_state != - OTRL_SMP_PROG_CHEATED) { + } + + if (context->smstate->sm_prog_state != + OTRL_SMP_PROG_CHEATED) { /* Send msg with next smp msg content */ - sendtlv = otrl_tlv_new(OTRL_TLV_SMP4, nextmsglen, - nextmsg); + sendtlv = otrl_tlv_new(OTRL_TLV_SMP4, + nextmsglen, nextmsg); err = otrl_proto_create_data(&sendsmp, context, "", sendtlv, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); + OTRL_MSGFLAGS_IGNORE_UNREADABLE, + NULL); if (!err) { - err = otrl_message_fragment_and_send(ops, + err = fragment_and_send(ops, opdata, context, sendsmp, OTRL_FRAGMENT_SEND_ALL, NULL); } free(sendsmp); otrl_tlv_free(sendtlv); + + if (ops->handle_smp_event) { + OtrlSMPEvent succorfail = + context->smstate->sm_prog_state == + OTRL_SMP_PROG_SUCCEEDED ? + OTRL_SMPEVENT_SUCCESS : + OTRL_SMPEVENT_FAILURE; + ops->handle_smp_event(opdata, succorfail, + context, 100, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_CHEATED, + context, 0, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + context->smstate->sm_prog_state = + OTRL_SMP_PROG_OK; + } + free(nextmsg); + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ERROR, context, + 0, NULL); + } + } + } + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP4); + if (tlv) { + if (nextMsg == OTRL_SMP_EXPECT4) { + err = otrl_sm_step5(context->smstate, tlv->data, + tlv->len); + /* Set trust level based on result */ + set_smp_trust(ops, opdata, context, + (err == gcry_error(GPG_ERR_NO_ERROR))); + + if (context->smstate->sm_prog_state != + OTRL_SMP_PROG_CHEATED) { + if (ops->handle_smp_event) { + OtrlSMPEvent succorfail = + context->smstate->sm_prog_state == + OTRL_SMP_PROG_SUCCEEDED ? + OTRL_SMPEVENT_SUCCESS : + OTRL_SMPEVENT_FAILURE; + ops->handle_smp_event(opdata, succorfail, + context, 100, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_CHEATED, + context, 0, NULL); + } + context->smstate->nextExpected = + OTRL_SMP_EXPECT1; + context->smstate->sm_prog_state = + OTRL_SMP_PROG_OK; + } + } else { + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, + OTRL_SMPEVENT_ERROR, context, + 0, NULL); + } } - free(nextmsg); - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP4); - if (tlv && nextMsg == OTRL_SMP_EXPECT4) { - err = otrl_sm_step5(context->smstate, tlv->data, - tlv->len); - /* Set trust level based on result */ - set_smp_trust(ops, opdata, context, - (err == gcry_error(GPG_ERR_NO_ERROR))); - } - tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP_ABORT); - if (tlv) { + } + + tlv = otrl_tlv_find(tlvs, OTRL_TLV_SMP_ABORT); + if (tlv) { context->smstate->nextExpected = OTRL_SMP_EXPECT1; + if (ops->handle_smp_event) { + ops->handle_smp_event(opdata, OTRL_SMPEVENT_ABORT, + context, 0, NULL); } - if (plaintext[0] == '\0') { + } + + if (plaintext[0] == '\0') { /* If it's a heartbeat (an empty message), don't - * display it to the user, but log a debug message. */ - format = "Heartbeat received from %s.\n"; - buf = malloc(strlen(format) + strlen(sender) - 1); - if (buf) { - sprintf(buf, format, sender); - if (ops->log_message) { - ops->log_message(opdata, buf); - } - free(buf); + * display it to the user, but signal an event. */ + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_LOG_HEARTBEAT_RCVD, + context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); } edata.ignore_message = 1; - } else if (edata.ignore_message == 0 && - context->their_keyid > 0) { + } else if (edata.ignore_message != 1 && + context->context_priv->their_keyid > 0) { /* If it's *not* a heartbeat, and we haven't * sent anything in a while, also send a * heartbeat. */ time_t now = time(NULL); - if (context->lastsent < (now - HEARTBEAT_INTERVAL)) { - char *heartbeat; - - /* Create the heartbeat message */ - err = otrl_proto_create_data(&heartbeat, - context, "", NULL, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); - if (!err) { - /* Send it, and log a debug message */ + if (context->context_priv->lastsent < + (now - HEARTBEAT_INTERVAL)) { + char *heartbeat; + + /* Create the heartbeat message */ + err = otrl_proto_create_data(&heartbeat, + context, "", NULL, + OTRL_MSGFLAGS_IGNORE_UNREADABLE, + NULL); + if (!err) { + /* Send it, and inject a debug message */ if (ops->inject_message) { - ops->inject_message(opdata, accountname, - protocol, sender, heartbeat); + ops->inject_message(opdata, accountname, + protocol, sender, heartbeat); } free(heartbeat); - context->lastsent = now; + context->context_priv->lastsent = now; + otrl_context_update_recent_child(context, 1); - /* Log a debug message */ - format = "Heartbeat sent to %s.\n"; - buf = malloc(strlen(format) + strlen(sender) - - 1); - if (buf) { - sprintf(buf, format, sender); - if (ops->log_message) { - ops->log_message(opdata, buf); - } - free(buf); + /* Signal an event for the heartbeat message */ + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_LOG_HEARTBEAT_SENT, + context, NULL, + gcry_error(GPG_ERR_NO_ERROR)); } - } - } + } } + } - /* Return the TLVs even if ignore_message == 1 so - * that we can attach TLVs to heartbeats. */ - if (tlvsp) { + /* Return the TLVs even if ignore_message == 1 so + * that we can attach TLVs to heartbeats. */ + if (tlvsp) { *tlvsp = tlvs; - } else { + } else { otrl_tlv_free(tlvs); - } + } + + if (edata.ignore_message != 1) { + char *converted_msg = NULL; - if (edata.ignore_message != 1) { *newmessagep = plaintext; edata.ignore_message = 0; - } else { - free(plaintext); + + /* convert the plaintext message if necessary */ + if (ops->convert_msg) { + ops->convert_msg(opdata, context, + OTRL_CONVERT_RECEIVING, &converted_msg, + plaintext); + + if (converted_msg) { + free(plaintext); + plaintext = NULL; + *newmessagep = strdup(converted_msg); + + if (ops->convert_free) { + ops->convert_free(opdata, context, + converted_msg); + } + } } - break; - } - break; + } else { + free(plaintext); + } + break; + } + break; case OTRL_MSGTYPE_ERROR: - if ((policy & OTRL_POLICY_ERROR_START_AKE)) { + if ((policy & OTRL_POLICY_ERROR_START_AKE)) { char *msgtosend = otrl_proto_default_query_msg( context->accountname, policy); if (msgtosend && ops->inject_message) { - ops->inject_message(opdata, context->accountname, - context->protocol, context->username, - msgtosend); + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, + msgtosend); } free(msgtosend); - } + } - if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { + if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED) { /* Mark the last message we sent as eligible for * retransmission */ - context->may_retransmit = 1; - } - - /* In any event, display the error message, with the - * display_otr_message callback, if possible */ - if (ops->display_otr_message) { - const char *otrerror = strstr(message, "?OTR Error:"); - if (otrerror) { - /* Skip the leading '?' */ - ++otrerror; + context->context_priv->may_retransmit = 1; + } + + /* In any event, display the error message, with the + * display_otr_message callback, if possible */ + if (ops->handle_msg_event) { + /* Remove the OTR error prefix and pass the msg */ + const char *just_err_msg = strstr(message, OTR_ERROR_PREFIX); + if (!just_err_msg) { + just_err_msg = message; } else { - otrerror = message; - } - if (!ops->display_otr_message(opdata, accountname, protocol, - sender, otrerror)) { - edata.ignore_message = 1; - } + just_err_msg += (strlen(OTR_ERROR_PREFIX)); + if (*just_err_msg == ' ') { + /* Advance pointer to skip the space character */ + just_err_msg++; + } + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_GENERAL_ERR, + context, just_err_msg, + gcry_error(GPG_ERR_NO_ERROR)); + edata.ignore_message = 1; } - break; + } + break; case OTRL_MSGTYPE_TAGGEDPLAINTEXT: - /* Strip the tag from the message */ - bestversion = otrl_proto_whitespace_bestversion(message, - &startwhite, &endwhite, policy); - if (startwhite && endwhite) { + /* Strip the tag from the message */ + bestversion = otrl_proto_whitespace_bestversion(message, + &startwhite, &endwhite, policy); + if (startwhite && endwhite) { size_t restlen = strlen(endwhite); - char *strippedmsg = _strdup(message); + char *strippedmsg = strdup(message); if (strippedmsg) { - memmove(strippedmsg + (startwhite - message), - strippedmsg + (endwhite - message), restlen+1); - *newmessagep = strippedmsg; - edata.ignore_message = 0; - } + memmove(strippedmsg + (startwhite - message), + strippedmsg + (endwhite - message), restlen+1); + *newmessagep = strippedmsg; + edata.ignore_message = 0; } - if (bestversion && context->msgstate != OTRL_MSGSTATE_ENCRYPTED - && (policy & OTRL_POLICY_WHITESPACE_START_AKE)) { + } + if (bestversion && context->msgstate != OTRL_MSGSTATE_ENCRYPTED + && (policy & OTRL_POLICY_WHITESPACE_START_AKE)) { switch(bestversion) { - case 2: - err = otrl_auth_start_v2(&(context->auth)); - send_or_error_auth(ops, opdata, err, context); + case 3: + err = otrl_auth_start_v23(&(context->auth), 3); + send_or_error_auth(ops, opdata, err, context, us); + break; + case 2: + err = otrl_auth_start_v23(&(context->auth), 2); + send_or_error_auth(ops, opdata, err, context, us); break; - case 1: + case 1: /* Get our private key */ privkey = otrl_privkey_find(us, context->accountname, context->protocol); if (privkey == NULL) { - /* We've got no private key! */ - if (ops->create_privkey) { + /* We've got no private key! */ + if (ops->create_privkey) { ops->create_privkey(opdata, context->accountname, context->protocol); privkey = otrl_privkey_find(us, context->accountname, context->protocol); - } + } } if (privkey) { - err = otrl_auth_start_v1(&(context->auth), NULL, 0, - privkey); - send_or_error_auth(ops, opdata, err, context); + err = otrl_auth_start_v1(&(context->auth), NULL, 0, + privkey); + send_or_error_auth(ops, opdata, err, context, us); } break; - default: + default: /* Don't start the AKE */ break; } - } + } - /* FALLTHROUGH */ + /* FALLTHROUGH */ case OTRL_MSGTYPE_NOTOTR: - if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT || - (policy & OTRL_POLICY_REQUIRE_ENCRYPTION)) { + if (best_context->msgstate != OTRL_MSGSTATE_PLAINTEXT || + (policy & OTRL_POLICY_REQUIRE_ENCRYPTION)) { /* Not fine. Let the user know. */ - - /* Don't use g_strdup_printf here, because someone - * (not us) is going to free() the *message pointer, - * not g_free() it. */ const char *plainmsg = (*newmessagep) ? *newmessagep : message; - const char *format = "The following message received " - "from %s was not encrypted: [</b>%s<b>]"; - char *buf = malloc(strlen(format) + strlen(context->username) - + strlen(plainmsg) - 3); - /* Remove "%s%s", add username + message + '\0' */ - if (buf) { - sprintf(buf, format, context->username, plainmsg); - if (ops->display_otr_message) { - if (!ops->display_otr_message(opdata, accountname, - protocol, sender, buf)) { - free(*newmessagep); - *newmessagep = NULL; - edata.ignore_message = 1; - } - } - if (edata.ignore_message != 1) { - free(*newmessagep); - *newmessagep = buf; - edata.ignore_message = 0; - } else { - free(buf); - } - } + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_UNENCRYPTED, + context, plainmsg, gcry_error(GPG_ERR_NO_ERROR)); + free(*newmessagep); + *newmessagep = NULL; + edata.ignore_message = 1; } - break; + } + break; case OTRL_MSGTYPE_UNKNOWN: - /* We received an OTR message we didn't recognize. Ignore - * it, but make a log entry. */ - if (ops->log_message) { - const char *format = "Unrecognized OTR message received " - "from %s.\n"; - char *buf = malloc(strlen(format) + strlen(sender) - 1); - if (buf) { - sprintf(buf, format, sender); - ops->log_message(opdata, buf); - free(buf); - } - } - if (edata.ignore_message == -1) edata.ignore_message = 1; - break; - } - - /* If we reassembled a fragmented message, we need to free the - * allocated memory now. */ - if (fragment_assembled) { - free(unfragmessage); - } - - if (edata.ignore_message == -1) edata.ignore_message = 0; - return edata.ignore_message; + /* We received an OTR message we didn't recognize. Ignore + * it, and signal an event. */ + if (ops->handle_msg_event) { + ops->handle_msg_event(opdata, + OTRL_MSGEVENT_RCVDMSG_UNRECOGNIZED, + context, NULL, gcry_error(GPG_ERR_NO_ERROR)); + } + if (edata.ignore_message == -1) edata.ignore_message = 1; + break; + } + +end: + /* If we reassembled a fragmented message, we need to free the + * allocated memory now. */ + free(unfragmessage); + + if (edata.ignore_message == -1) edata.ignore_message = 0; + return edata.ignore_message; } -/* Send a message to the network, fragmenting first if necessary. - * All messages to be sent to the network should go through this - * method immediately before they are sent, ie after encryption. */ -gcry_error_t otrl_message_fragment_and_send(const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context, const char *message, - OtrlFragmentPolicy fragPolicy, char **returnFragment) +/* Put a connection into the PLAINTEXT state, first sending the + * other side a notice that we're doing so if we're currently ENCRYPTED, + * and we think he's logged in. Affects only the specified context. */ +static void disconnect_context(OtrlUserState us, const OtrlMessageAppOps *ops, + void *opdata, ConnContext *context) { - int mms = 0; - if (message && ops->inject_message) { - int msglen; + if (!context) return; - if (otrl_api_version >= 0x030100 && ops->max_message_size) { - mms = ops->max_message_size(opdata, context); - } - msglen = strlen(message); - - /* Don't incur overhead of fragmentation unless necessary */ - if(mms != 0 && msglen > mms) { - char **fragments; - gcry_error_t err; - int i; - int fragment_count = ((msglen - 1) / (mms -19)) + 1; - /* like ceil(msglen/(mms - 19)) */ - - err = otrl_proto_fragment_create(mms, fragment_count, &fragments, - message); - if (err) { - return err; - } + if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED && + context->context_priv->their_keyid > 0 && + ops->is_logged_in && + ops->is_logged_in(opdata, context->accountname, context->protocol, + context->username) == 1) { + if (ops->inject_message) { + char *encmsg = NULL; + gcry_error_t err; + OtrlTLV *tlv = otrl_tlv_new(OTRL_TLV_DISCONNECTED, 0, NULL); - /* Determine which fragments to send and which to return - * based on given Fragment Policy. If the first fragment - * should be returned instead of sent, store it. */ - if (fragPolicy == OTRL_FRAGMENT_SEND_ALL_BUT_FIRST) { - *returnFragment = _strdup(fragments[0]); - } else { + err = otrl_proto_create_data(&encmsg, context, "", tlv, + OTRL_MSGFLAGS_IGNORE_UNREADABLE, NULL); + if (!err) { ops->inject_message(opdata, context->accountname, - context->protocol, context->username, fragments[0]); - } - for (i=1; i<fragment_count-1; i++) { - ops->inject_message(opdata, context->accountname, - context->protocol, context->username, fragments[i]); - } - /* If the last fragment should be stored instead of sent, - * store it */ - if (fragPolicy == OTRL_FRAGMENT_SEND_ALL_BUT_LAST) { - *returnFragment = _strdup(fragments[fragment_count-1]); - } else { - ops->inject_message(opdata, context->accountname, - context->protocol, context->username, fragments[fragment_count-1]); - } - /* Now free all fragment memory */ - otrl_proto_fragment_free(&fragments, fragment_count); - - } else { - /* No fragmentation necessary */ - if (fragPolicy == OTRL_FRAGMENT_SEND_ALL) { - ops->inject_message(opdata, context->accountname, - context->protocol, context->username, message); - } else { - /* Copy and return the entire given message. */ - int l = strlen(message) + 1; - *returnFragment = malloc(sizeof(char)*l); - strcpy(*returnFragment, message); - } + context->protocol, context->username, encmsg); + } + free(encmsg); + otrl_tlv_free(tlv); } - } - return gcry_error(GPG_ERR_NO_ERROR); + } + + otrl_context_force_plaintext(context); + if (ops->update_context_list) { + ops->update_context_list(opdata); + } } + /* Put a connection into the PLAINTEXT state, first sending the * other side a notice that we're doing so if we're currently ENCRYPTED, - * and we think he's logged in. */ + * and we think he's logged in. Affects only the specified instance. */ void otrl_message_disconnect(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, - const char *username) + const char *username, otrl_instag_t instance) { - ConnContext *context = otrl_context_find(us, username, accountname, - protocol, 0, NULL, NULL, NULL); + ConnContext *context = otrl_context_find(us, username, accountname, + protocol, instance, 0, NULL, NULL, NULL); - if (!context) return; + if (!context) return; - if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED && - context->their_keyid > 0 && - ops->is_logged_in && - ops->is_logged_in(opdata, accountname, protocol, username) == 1) { - if (ops->inject_message) { - char *encmsg = NULL; - gcry_error_t err; - OtrlTLV *tlv = otrl_tlv_new(OTRL_TLV_DISCONNECTED, 0, NULL); + disconnect_context(us, ops, opdata, context); +} - err = otrl_proto_create_data(&encmsg, context, "", tlv, - OTRL_MSGFLAGS_IGNORE_UNREADABLE); - if (!err) { - ops->inject_message(opdata, accountname, protocol, - username, encmsg); - } - free(encmsg); +/* Put a connection into the PLAINTEXT state, first sending the + * other side a notice that we're doing so if we're currently ENCRYPTED, + * and we think he's logged in. Affects all matching instances. */ +void otrl_message_disconnect_all_instances(OtrlUserState us, + const OtrlMessageAppOps *ops, void *opdata, const char *accountname, + const char *protocol, const char *username) +{ + ConnContext * c_iter; + ConnContext *context; + + if (!username || !accountname || !protocol) return; + + context = otrl_context_find(us, username, accountname, + protocol, OTRL_INSTAG_MASTER, 0, NULL, NULL, NULL); + + if (!context) return; + + for (c_iter = context; c_iter && c_iter->m_context == context->m_context; + c_iter = c_iter->next) { + disconnect_context(us, ops, opdata, c_iter); + } +} + +/* Get the current extra symmetric key (of size OTRL_EXTRAKEY_BYTES + * bytes) and let the other side know what we're going to use it for. + * The key is stored in symkey, which must already be allocated + * and OTRL_EXTRAKEY_BYTES bytes long. */ +gcry_error_t otrl_message_symkey(OtrlUserState us, + const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, + unsigned int use, const unsigned char *usedata, size_t usedatalen, + unsigned char *symkey) +{ + if (!context || (usedatalen > 0 && !usedata)) { + return gcry_error(GPG_ERR_INV_VALUE); + } + + if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED && + context->context_priv->their_keyid > 0) { + unsigned char *tlvdata = malloc(usedatalen+4); + char *encmsg = NULL; + gcry_error_t err; + OtrlTLV *tlv; + + tlvdata[0] = (use >> 24) & 0xff; + tlvdata[1] = (use >> 16) & 0xff; + tlvdata[2] = (use >> 8) & 0xff; + tlvdata[3] = (use) & 0xff; + if (usedatalen > 0) { + memmove(tlvdata+4, usedata, usedatalen); } + + tlv = otrl_tlv_new(OTRL_TLV_SYMKEY, usedatalen+4, tlvdata); + free(tlvdata); + + err = otrl_proto_create_data(&encmsg, context, "", tlv, + OTRL_MSGFLAGS_IGNORE_UNREADABLE, symkey); + if (!err && ops->inject_message) { + ops->inject_message(opdata, context->accountname, + context->protocol, context->username, encmsg); } + free(encmsg); + otrl_tlv_free(tlv); - otrl_context_force_plaintext(context); - if (ops->update_context_list) { - ops->update_context_list(opdata); + return err; + } + + /* We weren't in an encrypted session. */ + return gcry_error(GPG_ERR_INV_VALUE); +} + +/* If you do _not_ define a timer_control callback function, set a timer + * to go off every definterval = + * otrl_message_poll_get_default_interval(userstate) seconds, and call + * otrl_message_poll every time the timer goes off. */ +unsigned int otrl_message_poll_get_default_interval(OtrlUserState us) +{ + return POLL_DEFAULT_INTERVAL; +} + +/* Call this function every so often, either as directed by the + * timer_control callback, or every definterval = + * otrl_message_poll_get_default_interval(userstate) seconds if you have + * no timer_control callback. This function must be called from the + * main libotr thread.*/ +void otrl_message_poll(OtrlUserState us, const OtrlMessageAppOps *ops, + void *opdata) +{ + /* Wipe private keys last sent before this time */ + time_t expire_before = time(NULL) - MAX_AKE_WAIT_TIME; + + ConnContext *contextp; + + /* Is there a context still waiting for a DHKEY message, even after + * we wipe the stale ones? */ + int still_waiting = 0; + + if (us == NULL) return; + + for (contextp = us->context_root; contextp; contextp = contextp->next) { + /* If this is a master context, and it's still waiting for a + * v3 DHKEY message, see if it's waited long enough. */ + if (contextp->m_context == contextp && + contextp->auth.authstate == OTRL_AUTHSTATE_AWAITING_DHKEY && + contextp->auth.protocol_version == 3 && + contextp->auth.commit_sent_time > 0) { + if (contextp->auth.commit_sent_time < expire_before) { + otrl_auth_clear(&contextp->auth); + } else { + /* Not yet expired */ + still_waiting = 1; + } } + } + + /* If there's nothing more to wait for, stop the timer, if possible. */ + if (still_waiting == 0 && ops && ops->timer_control) { + ops->timer_control(opdata, 0); + us->timer_running = 0; + } } diff --git a/plugins/MirOTR/libotr/src/message.h b/plugins/MirOTR/libotr/src/message.h index e658e9d4b1..bb82ffc7e6 100644 --- a/plugins/MirOTR/libotr/src/message.h +++ b/plugins/MirOTR/libotr/src/message.h @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,18 +16,67 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __MESSAGE_H__ #define __MESSAGE_H__ +#define OTR_ERROR_PREFIX "?OTR Error: " + +typedef enum { + OTRL_ERRCODE_NONE, + OTRL_ERRCODE_ENCRYPTION_ERROR, + OTRL_ERRCODE_MSG_NOT_IN_PRIVATE, + OTRL_ERRCODE_MSG_UNREADABLE, + OTRL_ERRCODE_MSG_MALFORMED, +} OtrlErrorCode; + +/* These define the events used to indicate status of SMP to the UI */ +typedef enum { + OTRL_SMPEVENT_NONE, + OTRL_SMPEVENT_ERROR, + OTRL_SMPEVENT_ABORT, + OTRL_SMPEVENT_CHEATED, + OTRL_SMPEVENT_ASK_FOR_ANSWER, + OTRL_SMPEVENT_ASK_FOR_SECRET, + OTRL_SMPEVENT_IN_PROGRESS, + OTRL_SMPEVENT_SUCCESS, + OTRL_SMPEVENT_FAILURE +} OtrlSMPEvent; + +/* These define the events used to indicate the messages that need + * to be sent */ +typedef enum { + OTRL_MSGEVENT_NONE, + OTRL_MSGEVENT_ENCRYPTION_REQUIRED, + OTRL_MSGEVENT_ENCRYPTION_ERROR, + OTRL_MSGEVENT_CONNECTION_ENDED, + OTRL_MSGEVENT_SETUP_ERROR, + OTRL_MSGEVENT_MSG_REFLECTED, + OTRL_MSGEVENT_MSG_RESENT, + OTRL_MSGEVENT_RCVDMSG_NOT_IN_PRIVATE, + OTRL_MSGEVENT_RCVDMSG_UNREADABLE, + OTRL_MSGEVENT_RCVDMSG_MALFORMED, + OTRL_MSGEVENT_LOG_HEARTBEAT_RCVD, + OTRL_MSGEVENT_LOG_HEARTBEAT_SENT, + OTRL_MSGEVENT_RCVDMSG_GENERAL_ERR, + OTRL_MSGEVENT_RCVDMSG_UNENCRYPTED, + OTRL_MSGEVENT_RCVDMSG_UNRECOGNIZED, + OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE +} OtrlMessageEvent; + typedef enum { OTRL_NOTIFY_ERROR, OTRL_NOTIFY_WARNING, OTRL_NOTIFY_INFO } OtrlNotifyLevel; +typedef enum { + OTRL_CONVERT_SENDING, + OTRL_CONVERT_RECEIVING +} OtrlConvertType; + typedef struct s_OtrlMessageAppOps { /* Return the OTR policy for the given context. */ OtrlPolicy (*policy)(void *opdata, ConnContext *context); @@ -49,33 +100,10 @@ typedef struct s_OtrlMessageAppOps { void (*inject_message)(void *opdata, const char *accountname, const char *protocol, const char *recipient, const char *message); - /* Display a notification message for a particular accountname / - * protocol / username conversation. */ - void (*notify)(void *opdata, OtrlNotifyLevel level, - const char *accountname, const char *protocol, - const char *username, const char *title, - const char *primary, const char *secondary); - - /* Display an OTR control message for a particular accountname / - * protocol / username conversation. Return 0 if you are able to - * successfully display it. If you return non-0 (or if this - * function is NULL), the control message will be displayed inline, - * as a received message, or else by using the above notify() - * callback. */ - int (*display_otr_message)(void *opdata, const char *accountname, - const char *protocol, const char *username, const char *msg); - /* When the list of ConnContexts changes (including a change in * state), this is called so the UI can be updated. */ void (*update_context_list)(void *opdata); - /* Return a newly allocated string containing a human-friendly name - * for the given protocol id */ - const char *(*protocol_name)(void *opdata, const char *protocol); - - /* Deallocate a string allocated by protocol_name */ - void (*protocol_name_free)(void *opdata, const char *protocol_name); - /* A new fingerprint for the given user has been received. */ void (*new_fingerprint)(void *opdata, OtrlUserState us, const char *accountname, const char *protocol, @@ -94,9 +122,6 @@ typedef struct s_OtrlMessageAppOps { * already knew. is_reply indicates whether we initiated the AKE. */ void (*still_secure)(void *opdata, ConnContext *context, int is_reply); - /* Log a message. The passed message will end in "\n". */ - void (*log_message)(void *opdata, const char *message); - /* Find the maximum message size supported by this protocol. */ int (*max_message_size)(void *opdata, ConnContext *context); @@ -108,6 +133,166 @@ typedef struct s_OtrlMessageAppOps { /* Deallocate a string returned by account_name */ void (*account_name_free)(void *opdata, const char *account_name); + /* We received a request from the buddy to use the current "extra" + * symmetric key. The key will be passed in symkey, of length + * OTRL_EXTRAKEY_BYTES. The requested use, as well as use-specific + * data will be passed so that the applications can communicate other + * information (some id for the data transfer, for example). */ + void (*received_symkey)(void *opdata, ConnContext *context, + unsigned int use, const unsigned char *usedata, + size_t usedatalen, const unsigned char *symkey); + + /* Return a string according to the error event. This string will then + * be concatenated to an OTR header to produce an OTR protocol error + * message. The following are the possible error events: + * - OTRL_ERRCODE_ENCRYPTION_ERROR + * occured while encrypting a message + * - OTRL_ERRCODE_MSG_NOT_IN_PRIVATE + * sent encrypted message to somebody who is not in + * a mutual OTR session + * - OTRL_ERRCODE_MSG_UNREADABLE + * sent an unreadable encrypted message + * - OTRL_ERRCODE_MSG_MALFORMED + * message sent is malformed */ + const char *(*otr_error_message)(void *opdata, ConnContext *context, + OtrlErrorCode err_code); + + /* Deallocate a string returned by otr_error_message */ + void (*otr_error_message_free)(void *opdata, const char *err_msg); + + /* Return a string that will be prefixed to any resent message. If this + * function is not provided by the application then the default prefix, + * "[resent]", will be used. + * */ + const char *(*resent_msg_prefix)(void *opdata, ConnContext *context); + + /* Deallocate a string returned by resent_msg_prefix */ + void (*resent_msg_prefix_free)(void *opdata, const char *prefix); + + /* Update the authentication UI with respect to SMP events + * These are the possible events: + * - OTRL_SMPEVENT_ASK_FOR_SECRET + * prompt the user to enter a shared secret. The sender application + * should call otrl_message_initiate_smp, passing NULL as the question. + * When the receiver application resumes the SM protocol by calling + * otrl_message_respond_smp with the secret answer. + * - OTRL_SMPEVENT_ASK_FOR_ANSWER + * (same as OTRL_SMPEVENT_ASK_FOR_SECRET but sender calls + * otrl_message_initiate_smp_q instead) + * - OTRL_SMPEVENT_CHEATED + * abort the current auth and update the auth progress dialog + * with progress_percent. otrl_message_abort_smp should be called to + * stop the SM protocol. + * - OTRL_SMPEVENT_INPROGRESS and + * OTRL_SMPEVENT_SUCCESS and + * OTRL_SMPEVENT_FAILURE and + * OTRL_SMPEVENT_ABORT + * update the auth progress dialog with progress_percent + * - OTRL_SMPEVENT_ERROR + * (same as OTRL_SMPEVENT_CHEATED) + * */ + void (*handle_smp_event)(void *opdata, OtrlSMPEvent smp_event, + ConnContext *context, unsigned short progress_percent, + char *question); + + /* Handle and send the appropriate message(s) to the sender/recipient + * depending on the message events. All the events only require an opdata, + * the event, and the context. The message and err will be NULL except for + * some events (see below). The possible events are: + * - OTRL_MSGEVENT_ENCRYPTION_REQUIRED + * Our policy requires encryption but we are trying to send + * an unencrypted message out. + * - OTRL_MSGEVENT_ENCRYPTION_ERROR + * An error occured while encrypting a message and the message + * was not sent. + * - OTRL_MSGEVENT_CONNECTION_ENDED + * Message has not been sent because our buddy has ended the + * private conversation. We should either close the connection, + * or refresh it. + * - OTRL_MSGEVENT_SETUP_ERROR + * A private conversation could not be set up. A gcry_error_t + * will be passed. + * - OTRL_MSGEVENT_MSG_REFLECTED + * Received our own OTR messages. + * - OTRL_MSGEVENT_MSG_RESENT + * The previous message was resent. + * - OTRL_MSGEVENT_RCVDMSG_NOT_IN_PRIVATE + * Received an encrypted message but cannot read + * it because no private connection is established yet. + * - OTRL_MSGEVENT_RCVDMSG_UNREADABLE + * Cannot read the received message. + * - OTRL_MSGEVENT_RCVDMSG_MALFORMED + * The message received contains malformed data. + * - OTRL_MSGEVENT_LOG_HEARTBEAT_RCVD + * Received a heartbeat. + * - OTRL_MSGEVENT_LOG_HEARTBEAT_SENT + * Sent a heartbeat. + * - OTRL_MSGEVENT_RCVDMSG_GENERAL_ERR + * Received a general OTR error. The argument 'message' will + * also be passed and it will contain the OTR error message. + * - OTRL_MSGEVENT_RCVDMSG_UNENCRYPTED + * Received an unencrypted message. The argument 'message' will + * also be passed and it will contain the plaintext message. + * - OTRL_MSGEVENT_RCVDMSG_UNRECOGNIZED + * Cannot recognize the type of OTR message received. + * - OTRL_MSGEVENT_RCVDMSG_FOR_OTHER_INSTANCE + * Received and discarded a message intended for another instance. */ + void (*handle_msg_event)(void *opdata, OtrlMessageEvent msg_event, + ConnContext *context, const char *message, + gcry_error_t err); + + /* Create a instance tag for the given accountname/protocol if + * desired. */ + void (*create_instag)(void *opdata, const char *accountname, + const char *protocol); + + /* Called immediately before a data message is encrypted, and after a data + * message is decrypted. The OtrlConvertType parameter has the value + * OTRL_CONVERT_SENDING or OTRL_CONVERT_RECEIVING to differentiate these + * cases. */ + void (*convert_msg)(void *opdata, ConnContext *context, + OtrlConvertType convert_type, char ** dest, const char *src); + + /* Deallocate a string returned by convert_msg. */ + void (*convert_free)(void *opdata, ConnContext *context, char *dest); + + /* When timer_control is called, turn off any existing periodic + * timer. + * + * Additionally, if interval > 0, set a new periodic timer + * to go off every interval seconds. When that timer fires, you + * must call otrl_message_poll(userstate, uiops, uiopdata); from the + * main libotr thread. + * + * The timing does not have to be exact; this timer is used to + * provide forward secrecy by cleaning up stale private state that + * may otherwise stick around in memory. Note that the + * timer_control callback may be invoked from otrl_message_poll + * itself, possibly to indicate that interval == 0 (that is, that + * there's no more periodic work to be done at this time). + * + * If you set this callback to NULL, then you must ensure that your + * application calls otrl_message_poll(userstate, uiops, uiopdata); + * from the main libotr thread every definterval seconds (where + * definterval can be obtained by calling + * definterval = otrl_message_poll_get_default_interval(userstate); + * right after creating the userstate). The advantage of + * implementing the timer_control callback is that the timer can be + * turned on by libotr only when it's needed. + * + * It is not a problem (except for a minor performance hit) to call + * otrl_message_poll more often than requested, whether + * timer_control is implemented or not. + * + * If you fail to implement the timer_control callback, and also + * fail to periodically call otrl_message_poll, then you open your + * users to a possible forward secrecy violation: an attacker that + * compromises the user's computer may be able to decrypt a handful + * of long-past messages (the first messages of an OTR + * conversation). + */ + void (*timer_control)(void *opdata, unsigned int interval); + } OtrlMessageAppOps; /* Deallocate a message allocated by other otrl_message_* routines. */ @@ -120,24 +305,40 @@ void otrl_message_free(char *message); * pointer to the new ConnContext. You can use this to add * application-specific information to the ConnContext using the * "context->app" field, for example. If you don't need to do this, you - * can pass NULL for the last two arguments of otrl_message_sending. + * can pass NULL for the last two arguments of otrl_message_sending. * * tlvs is a chain of OtrlTLVs to append to the private message. It is * usually correct to just pass NULL here. * - * If this routine returns non-zero, then the library tried to encrypt - * the message, but for some reason failed. DO NOT send the message in - * the clear in that case. - * - * If *messagep gets set by the call to something non-NULL, then you - * should replace your message with the contents of *messagep, and - * send that instead. Call otrl_message_free(*messagep) when you're + * If non-NULL, ops->convert_msg will be called just before encrypting a + * message. + * + * "instag" specifies the instance tag of the buddy (protocol version 3 only). + * Meta-instances may also be specified (e.g., OTRL_INSTAG_MOST_SECURE). + * If "contextp" is not NULL, it will be set to the ConnContext used for + * sending the message. + * + * If no fragmentation or msg injection is wanted, use OTRL_FRAGMENT_SEND_SKIP + * as the OtrlFragmentPolicy. In this case, this function will assign *messagep + * with the encrypted msg. If the routine returns non-zero, then the library + * tried to encrypt the message, but for some reason failed. DO NOT send the + * message in the clear in that case. If *messagep gets set by the call to + * something non-NULL, then you should replace your message with the contents + * of *messagep, and send that instead. + * + * Other fragmentation policies are OTRL_FRAGMENT_SEND_ALL, + * OTRL_FRAGMENT_SEND_ALL_BUT_LAST, or OTRL_FRAGMENT_SEND_ALL_BUT_FIRST. In + * these cases, the appropriate fragments will be automatically sent. For the + * last two policies, the remaining fragment will be passed in *original_msg. + * + * Call otrl_message_free(*messagep) if you don't need *messagep or when you're * done with it. */ gcry_error_t otrl_message_sending(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, - const char *recipient, const char *message, OtrlTLV *tlvs, - char **messagep, + const char *recipient, otrl_instag_t instag, const char *original_msg, + OtrlTLV *tlvs, char **messagep, OtrlFragmentPolicy fragPolicy, + ConnContext **contextp, void (*add_appdata)(void *data, ConnContext *context), void *data); @@ -148,7 +349,13 @@ gcry_error_t otrl_message_sending(OtrlUserState us, * a pointer to the new ConnContext. You can use this to add * application-specific information to the ConnContext using the * "context->app" field, for example. If you don't need to do this, you - * can pass NULL for the last two arguments of otrl_message_receiving. + * can pass NULL for the last two arguments of otrl_message_receiving. + * + * If non-NULL, ops->convert_msg will be called after a data message is + * decrypted. + * + * If "contextp" is not NULL, it will be set to the ConnContext used for + * receiving the message. * * If otrl_message_receiving returns 1, then the message you received * was an internal protocol message, and no message should be delivered @@ -168,23 +375,23 @@ gcry_error_t otrl_message_sending(OtrlUserState us, int otrl_message_receiving(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, const char *sender, const char *message, char **newmessagep, - OtrlTLV **tlvsp, + OtrlTLV **tlvsp, ConnContext **contextp, void (*add_appdata)(void *data, ConnContext *context), void *data); -/* Send a message to the network, fragmenting first if necessary. - * All messages to be sent to the network should go through this - * method immediately before they are sent, ie after encryption. */ -gcry_error_t otrl_message_fragment_and_send(const OtrlMessageAppOps *ops, - void *opdata, ConnContext *context, const char *message, - OtrlFragmentPolicy fragPolicy, char **returnFragment); - /* Put a connection into the PLAINTEXT state, first sending the * other side a notice that we're doing so if we're currently ENCRYPTED, - * and we think he's logged in. */ + * and we think he's logged in. Affects only the specified instance. */ void otrl_message_disconnect(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, - const char *username); + const char *username, otrl_instag_t instance); + +/* Put a connection into the PLAINTEXT state, first sending the + * other side a notice that we're doing so if we're currently ENCRYPTED, + * and we think he's logged in. Affects all matching instances. */ +void otrl_message_disconnect_all_instances(OtrlUserState us, + const OtrlMessageAppOps *ops, void *opdata, const char *accountname, + const char *protocol, const char *username); /* Initiate the Socialist Millionaires' Protocol */ void otrl_message_initiate_smp(OtrlUserState us, const OtrlMessageAppOps *ops, @@ -207,4 +414,27 @@ void otrl_message_respond_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void otrl_message_abort_smp(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, ConnContext *context); +/* Get the current extra symmetric key (of size OTRL_EXTRAKEY_BYTES + * bytes) and let the other side know what we're going to use it for. + * The key is stored in symkey, which must already be allocated + * and OTRL_EXTRAKEY_BYTES bytes long. */ +gcry_error_t otrl_message_symkey(OtrlUserState us, + const OtrlMessageAppOps *ops, void *opdata, ConnContext *context, + unsigned int use, const unsigned char *usedata, size_t usedatalen, + unsigned char *symkey); + +/* If you do _not_ define a timer_control callback function, set a timer + * to go off every definterval = + * otrl_message_poll_get_default_interval(userstate) seconds, and call + * otrl_message_poll every time the timer goes off. */ +unsigned int otrl_message_poll_get_default_interval(OtrlUserState us); + +/* Call this function every so often, either as directed by the + * timer_control callback, or every definterval = + * otrl_message_poll_get_default_interval(userstate) seconds if you have + * no timer_control callback. This function must be called from the + * main libotr thread.*/ +void otrl_message_poll(OtrlUserState us, const OtrlMessageAppOps *ops, + void *opdata); + #endif diff --git a/plugins/MirOTR/libotr/src/privkey-t.h b/plugins/MirOTR/libotr/src/privkey-t.h index 3421b8baac..7dd120e789 100644 --- a/plugins/MirOTR/libotr/src/privkey-t.h +++ b/plugins/MirOTR/libotr/src/privkey-t.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2009 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __PRIVKEY_T_H__ @@ -36,4 +37,14 @@ typedef struct s_OtrlPrivKey { #define OTRL_PUBKEY_TYPE_DSA 0x0000 +/* The list of privkeys currently being constructed, possibly in a + * background thread */ +typedef struct s_OtrlPendingPrivKey { + struct s_OtrlPendingPrivKey *next; + struct s_OtrlPendingPrivKey **tous; + + char *accountname; + char *protocol; +} OtrlPendingPrivKey; + #endif diff --git a/plugins/MirOTR/libotr/src/privkey.c b/plugins/MirOTR/libotr/src/privkey.c index 498bfae39a..6e4bbe40fc 100644 --- a/plugins/MirOTR/libotr/src/privkey.c +++ b/plugins/MirOTR/libotr/src/privkey.c @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -31,44 +32,47 @@ #include "serial.h" /* Convert a 20-byte hash value to a 45-byte human-readable value */ -void otrl_privkey_hash_to_human(char human[45], const unsigned char hash[20]) +void otrl_privkey_hash_to_human( + char human[OTRL_PRIVKEY_FPRINT_HUMAN_LEN], + const unsigned char hash[20]) { - int word, byte; - char *p = human; + int word, byte; + char *p = human; - for(word=0; word<5; ++word) { + for(word=0; word<5; ++word) { for(byte=0; byte<4; ++byte) { - sprintf(p, "%02X", hash[word*4+byte]); - p += 2; + sprintf(p, "%02X", hash[word*4+byte]); + p += 2; } *(p++) = ' '; - } - /* Change that last ' ' to a '\0' */ - --p; - *p = '\0'; + } + /* Change that last ' ' to a '\0' */ + --p; + *p = '\0'; } /* Calculate a human-readable hash of our DSA public key. Return it in * the passed fingerprint buffer. Return NULL on error, or a pointer to * the given buffer on success. */ -char *otrl_privkey_fingerprint(OtrlUserState us, char fingerprint[45], +char *otrl_privkey_fingerprint(OtrlUserState us, + char fingerprint[OTRL_PRIVKEY_FPRINT_HUMAN_LEN], const char *accountname, const char *protocol) { - unsigned char hash[20]; - OtrlPrivKey *p = otrl_privkey_find(us, accountname, protocol); + unsigned char hash[20]; + OtrlPrivKey *p = otrl_privkey_find(us, accountname, protocol); - if (p) { + if (p) { /* Calculate the hash */ gcry_md_hash_buffer(GCRY_MD_SHA1, hash, p->pubkey_data, p->pubkey_datalen); /* Now convert it to a human-readable format */ otrl_privkey_hash_to_human(fingerprint, hash); - } else { + } else { return NULL; - } + } - return fingerprint; + return fingerprint; } /* Calculate a raw hash of our DSA public key. Return it in the passed @@ -77,184 +81,184 @@ char *otrl_privkey_fingerprint(OtrlUserState us, char fingerprint[45], unsigned char *otrl_privkey_fingerprint_raw(OtrlUserState us, unsigned char hash[20], const char *accountname, const char *protocol) { - OtrlPrivKey *p = otrl_privkey_find(us, accountname, protocol); + OtrlPrivKey *p = otrl_privkey_find(us, accountname, protocol); - if (p) { + if (p) { /* Calculate the hash */ gcry_md_hash_buffer(GCRY_MD_SHA1, hash, p->pubkey_data, p->pubkey_datalen); - } else { + } else { return NULL; - } + } - return hash; + return hash; } /* Create a public key block from a private key */ static gcry_error_t make_pubkey(unsigned char **pubbufp, size_t *publenp, gcry_sexp_t privkey) { - gcry_mpi_t p,q,g,y; - gcry_sexp_t dsas,ps,qs,gs,ys; - size_t np,nq,ng,ny; - enum gcry_mpi_format format = GCRYMPI_FMT_USG; - unsigned char *bufp; - size_t lenp; - - *pubbufp = NULL; - *publenp = 0; - - /* Extract the public parameters */ - dsas = gcry_sexp_find_token(privkey, "dsa", 0); - if (dsas == NULL) { + gcry_mpi_t p,q,g,y; + gcry_sexp_t dsas,ps,qs,gs,ys; + size_t np,nq,ng,ny; + enum gcry_mpi_format format = GCRYMPI_FMT_USG; + unsigned char *bufp; + size_t lenp; + + *pubbufp = NULL; + *publenp = 0; + + /* Extract the public parameters */ + dsas = gcry_sexp_find_token(privkey, "dsa", 0); + if (dsas == NULL) { return gcry_error(GPG_ERR_UNUSABLE_SECKEY); - } - ps = gcry_sexp_find_token(dsas, "p", 0); - qs = gcry_sexp_find_token(dsas, "q", 0); - gs = gcry_sexp_find_token(dsas, "g", 0); - ys = gcry_sexp_find_token(dsas, "y", 0); - gcry_sexp_release(dsas); - if (!ps || !qs || !gs || !ys) { + } + ps = gcry_sexp_find_token(dsas, "p", 0); + qs = gcry_sexp_find_token(dsas, "q", 0); + gs = gcry_sexp_find_token(dsas, "g", 0); + ys = gcry_sexp_find_token(dsas, "y", 0); + gcry_sexp_release(dsas); + if (!ps || !qs || !gs || !ys) { gcry_sexp_release(ps); gcry_sexp_release(qs); gcry_sexp_release(gs); gcry_sexp_release(ys); return gcry_error(GPG_ERR_UNUSABLE_SECKEY); - } - p = gcry_sexp_nth_mpi(ps, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(ps); - q = gcry_sexp_nth_mpi(qs, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(qs); - g = gcry_sexp_nth_mpi(gs, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(gs); - y = gcry_sexp_nth_mpi(ys, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(ys); - if (!p || !q || !g || !y) { + } + p = gcry_sexp_nth_mpi(ps, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(ps); + q = gcry_sexp_nth_mpi(qs, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(qs); + g = gcry_sexp_nth_mpi(gs, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(gs); + y = gcry_sexp_nth_mpi(ys, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(ys); + if (!p || !q || !g || !y) { gcry_mpi_release(p); gcry_mpi_release(q); gcry_mpi_release(g); gcry_mpi_release(y); return gcry_error(GPG_ERR_UNUSABLE_SECKEY); - } - - *publenp = 0; - gcry_mpi_print(format, NULL, 0, &np, p); - *publenp += np + 4; - gcry_mpi_print(format, NULL, 0, &nq, q); - *publenp += nq + 4; - gcry_mpi_print(format, NULL, 0, &ng, g); - *publenp += ng + 4; - gcry_mpi_print(format, NULL, 0, &ny, y); - *publenp += ny + 4; - - *pubbufp = malloc(*publenp); - if (*pubbufp == NULL) { + } + + *publenp = 0; + gcry_mpi_print(format, NULL, 0, &np, p); + *publenp += np + 4; + gcry_mpi_print(format, NULL, 0, &nq, q); + *publenp += nq + 4; + gcry_mpi_print(format, NULL, 0, &ng, g); + *publenp += ng + 4; + gcry_mpi_print(format, NULL, 0, &ny, y); + *publenp += ny + 4; + + *pubbufp = malloc(*publenp); + if (*pubbufp == NULL) { gcry_mpi_release(p); gcry_mpi_release(q); gcry_mpi_release(g); gcry_mpi_release(y); return gcry_error(GPG_ERR_ENOMEM); - } - bufp = *pubbufp; - lenp = *publenp; + } + bufp = *pubbufp; + lenp = *publenp; - write_mpi(p,np,"P"); - write_mpi(q,nq,"Q"); - write_mpi(g,ng,"G"); - write_mpi(y,ny,"Y"); + write_mpi(p,np,"P"); + write_mpi(q,nq,"Q"); + write_mpi(g,ng,"G"); + write_mpi(y,ny,"Y"); - gcry_mpi_release(p); - gcry_mpi_release(q); - gcry_mpi_release(g); - gcry_mpi_release(y); + gcry_mpi_release(p); + gcry_mpi_release(q); + gcry_mpi_release(g); + gcry_mpi_release(y); - return gcry_error(GPG_ERR_NO_ERROR); + return gcry_error(GPG_ERR_NO_ERROR); } /* Read a sets of private DSA keys from a file on disk into the given * OtrlUserState. */ gcry_error_t otrl_privkey_read(OtrlUserState us, const char *filename) { - FILE *privf; - gcry_error_t err; - - /* Open the privkey file. We use rb mode so that on WIN32, fread() - * reads the same number of bytes that fstat() indicates are in the - * file. */ - privf = fopen(filename, "rb"); - if (!privf) { + FILE *privf; + gcry_error_t err; + + /* Open the privkey file. We use rb mode so that on WIN32, fread() + * reads the same number of bytes that fstat() indicates are in the + * file. */ + privf = fopen(filename, "rb"); + if (!privf) { err = gcry_error_from_errno(errno); return err; - } + } - err = otrl_privkey_read_FILEp(us, privf); + err = otrl_privkey_read_FILEp(us, privf); - fclose(privf); - return err; + fclose(privf); + return err; } /* Read a sets of private DSA keys from a FILE* into the given * OtrlUserState. The FILE* must be open for reading. */ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf) { - int privfd; - struct stat st; - char *buf; - const char *token; - size_t tokenlen; - gcry_error_t err; - gcry_sexp_t allkeys; - size_t i; - - if (!privf) return gcry_error(GPG_ERR_NO_ERROR); - - /* Release any old ideas we had about our keys */ - otrl_privkey_forget_all(us); - - /* Load the data into a buffer */ - privfd = _fileno(privf); - if (fstat(privfd, &st)) { + int privfd; + struct stat st; + char *buf; + const char *token; + size_t tokenlen; + gcry_error_t err; + gcry_sexp_t allkeys; + int i; + + if (!privf) return gcry_error(GPG_ERR_NO_ERROR); + + /* Release any old ideas we had about our keys */ + otrl_privkey_forget_all(us); + + /* Load the data into a buffer */ + privfd = fileno(privf); + if (fstat(privfd, &st)) { err = gcry_error_from_errno(errno); return err; - } - buf = malloc(st.st_size); - if (!buf && st.st_size > 0) { + } + buf = malloc(st.st_size); + if (!buf && st.st_size > 0) { return gcry_error(GPG_ERR_ENOMEM); - } - if (fread(buf, st.st_size, 1, privf) != 1) { + } + if (fread(buf, st.st_size, 1, privf) != 1) { err = gcry_error_from_errno(errno); free(buf); return err; - } + } - err = gcry_sexp_new(&allkeys, buf, st.st_size, 0); - free(buf); - if (err) { + err = gcry_sexp_new(&allkeys, buf, st.st_size, 0); + free(buf); + if (err) { return err; - } + } - token = gcry_sexp_nth_data(allkeys, 0, &tokenlen); - if (tokenlen != 8 || strncmp(token, "privkeys", 8)) { + token = gcry_sexp_nth_data(allkeys, 0, &tokenlen); + if (tokenlen != 8 || strncmp(token, "privkeys", 8)) { gcry_sexp_release(allkeys); return gcry_error(GPG_ERR_UNUSABLE_SECKEY); - } + } - /* Get each account */ - for(i=1; i<gcry_sexp_length(allkeys); ++i) { + /* Get each account */ + for(i=1; i<gcry_sexp_length(allkeys); ++i) { gcry_sexp_t names, protos, privs; char *name, *proto; gcry_sexp_t accounts; OtrlPrivKey *p; - + /* Get the ith "account" S-exp */ accounts = gcry_sexp_nth(allkeys, i); - + /* It's really an "account" S-exp? */ token = gcry_sexp_nth_data(accounts, 0, &tokenlen); if (tokenlen != 7 || strncmp(token, "account", 7)) { - gcry_sexp_release(accounts); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_UNUSABLE_SECKEY); + gcry_sexp_release(accounts); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_UNUSABLE_SECKEY); } /* Extract the name, protocol, and privkey S-exps */ names = gcry_sexp_find_token(accounts, "name", 0); @@ -262,28 +266,28 @@ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf) privs = gcry_sexp_find_token(accounts, "private-key", 0); gcry_sexp_release(accounts); if (!names || !protos || !privs) { - gcry_sexp_release(names); - gcry_sexp_release(protos); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_UNUSABLE_SECKEY); + gcry_sexp_release(names); + gcry_sexp_release(protos); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_UNUSABLE_SECKEY); } /* Extract the actual name and protocol */ token = gcry_sexp_nth_data(names, 1, &tokenlen); if (!token) { - gcry_sexp_release(names); - gcry_sexp_release(protos); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_UNUSABLE_SECKEY); + gcry_sexp_release(names); + gcry_sexp_release(protos); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_UNUSABLE_SECKEY); } name = malloc(tokenlen + 1); if (!name) { - gcry_sexp_release(names); - gcry_sexp_release(protos); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_ENOMEM); + gcry_sexp_release(names); + gcry_sexp_release(protos); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_ENOMEM); } memmove(name, token, tokenlen); name[tokenlen] = '\0'; @@ -291,19 +295,19 @@ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf) token = gcry_sexp_nth_data(protos, 1, &tokenlen); if (!token) { - free(name); - gcry_sexp_release(protos); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_UNUSABLE_SECKEY); + free(name); + gcry_sexp_release(protos); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_UNUSABLE_SECKEY); } proto = malloc(tokenlen + 1); if (!proto) { - free(name); - gcry_sexp_release(protos); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_ENOMEM); + free(name); + gcry_sexp_release(protos); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_ENOMEM); } memmove(proto, token, tokenlen); proto[tokenlen] = '\0'; @@ -312,11 +316,11 @@ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf) /* Make a new OtrlPrivKey entry */ p = malloc(sizeof(*p)); if (!p) { - free(name); - free(proto); - gcry_sexp_release(privs); - gcry_sexp_release(allkeys); - return gcry_error(GPG_ERR_ENOMEM); + free(name); + free(proto); + gcry_sexp_release(privs); + gcry_sexp_release(allkeys); + return gcry_error(GPG_ERR_ENOMEM); } /* Fill it in and link it up */ @@ -326,155 +330,340 @@ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf) p->privkey = privs; p->next = us->privkey_root; if (p->next) { - p->next->tous = &(p->next); + p->next->tous = &(p->next); } p->tous = &(us->privkey_root); us->privkey_root = p; err = make_pubkey(&(p->pubkey_data), &(p->pubkey_datalen), p->privkey); if (err) { - gcry_sexp_release(allkeys); - otrl_privkey_forget(p); - return gcry_error(GPG_ERR_UNUSABLE_SECKEY); + gcry_sexp_release(allkeys); + otrl_privkey_forget(p); + return gcry_error(GPG_ERR_UNUSABLE_SECKEY); } + } + gcry_sexp_release(allkeys); + + return gcry_error(GPG_ERR_NO_ERROR); +} + +static OtrlPendingPrivKey *pending_find(OtrlUserState us, + const char *accountname, const char *protocol) +{ + OtrlPendingPrivKey *search = us->pending_root; + + while (search) { + if (!strcmp(search->accountname, accountname) && + !strcmp(search->protocol, protocol)) { + /* Found it */ + return search; } - gcry_sexp_release(allkeys); + search = search->next; + } + return NULL; +} - return gcry_error(GPG_ERR_NO_ERROR); +/* Insert an account/protocol pair into the pending privkey list of the + * given OtrlUserState and return a pointer to the new + * OtrlPendingPrivKey, or return NULL if it's already there. */ +static OtrlPendingPrivKey *pending_insert(OtrlUserState us, + const char *accountname, const char *protocol) +{ + /* See if it's already there */ + OtrlPendingPrivKey *search = pending_find(us, accountname, protocol); + + if (search) { + /* It is */ + return NULL; + } + + /* We'll insert it at the beginning of the list */ + search = malloc(sizeof(*search)); + if (!search) return NULL; + + search->accountname = strdup(accountname); + search->protocol = strdup(protocol); + + search->next = us->pending_root; + us->pending_root = search; + if (search->next) { + search->next->tous = &(search->next); + } + search->tous = &(us->pending_root); + return search; +} + +static void pending_forget(OtrlPendingPrivKey *ppk) +{ + if (ppk) { + free(ppk->accountname); + free(ppk->protocol); + + /* Re-link the list */ + *(ppk->tous) = ppk->next; + if (ppk->next) { + ppk->next->tous = ppk->tous; + } + + free(ppk); + } +} + +/* Free the memory associated with the pending privkey list */ +void otrl_privkey_pending_forget_all(OtrlUserState us) +{ + while(us->pending_root) { + pending_forget(us->pending_root); + } } static gcry_error_t sexp_write(FILE *privf, gcry_sexp_t sexp) { - size_t buflen; - char *buf; + size_t buflen; + char *buf; - buflen = gcry_sexp_sprint(sexp, GCRYSEXP_FMT_ADVANCED, NULL, 0); - buf = malloc(buflen); - if (buf == NULL && buflen > 0) { + buflen = gcry_sexp_sprint(sexp, GCRYSEXP_FMT_ADVANCED, NULL, 0); + buf = malloc(buflen); + if (buf == NULL && buflen > 0) { return gcry_error(GPG_ERR_ENOMEM); - } - gcry_sexp_sprint(sexp, GCRYSEXP_FMT_ADVANCED, buf, buflen); - - fprintf(privf, "%s", buf); - free(buf); + } + gcry_sexp_sprint(sexp, GCRYSEXP_FMT_ADVANCED, buf, buflen); - return gcry_error(GPG_ERR_NO_ERROR); + fprintf(privf, "%s", buf); + free(buf); + + return gcry_error(GPG_ERR_NO_ERROR); } static gcry_error_t account_write(FILE *privf, const char *accountname, const char *protocol, gcry_sexp_t privkey) { - gcry_error_t err; - gcry_sexp_t names, protos; + gcry_error_t err; + gcry_sexp_t names, protos; - fprintf(privf, " (account\n"); + fprintf(privf, " (account\n"); - err = gcry_sexp_build(&names, NULL, "(name %s)", accountname); - if (!err) { + err = gcry_sexp_build(&names, NULL, "(name %s)", accountname); + if (!err) { err = sexp_write(privf, names); gcry_sexp_release(names); - } - if (!err) err = gcry_sexp_build(&protos, NULL, "(protocol %s)", protocol); - if (!err) { + } + if (!err) err = gcry_sexp_build(&protos, NULL, "(protocol %s)", protocol); + if (!err) { err = sexp_write(privf, protos); gcry_sexp_release(protos); - } - if (!err) err = sexp_write(privf, privkey); + } + if (!err) err = sexp_write(privf, privkey); - fprintf(privf, " )\n"); + fprintf(privf, " )\n"); + return err; +} + +struct s_pending_privkey_calc { + char *accountname; + char *protocol; + gcry_sexp_t privkey; +}; + +/* Begin a private key generation that will potentially take place in + * a background thread. This routine must be called from the main + * thread. It will set *newkeyp, which you can pass to + * otrl_privkey_generate_calculate in a background thread. If it + * returns gcry_error(GPG_ERR_EEXIST), then a privkey creation for + * this accountname/protocol is already in progress, and *newkeyp will + * be set to NULL. */ +gcry_error_t otrl_privkey_generate_start(OtrlUserState us, + const char *accountname, const char *protocol, void **newkeyp) +{ + OtrlPendingPrivKey *found = pending_find(us, accountname, protocol); + struct s_pending_privkey_calc *ppc; + + if (found) { + if (newkeyp) *newkeyp = NULL; + return gcry_error(GPG_ERR_EEXIST); + } + + /* We're not already creating this key. Mark it as in progress. */ + pending_insert(us, accountname, protocol); + + /* Allocate the working structure */ + ppc = malloc(sizeof(*ppc)); + ppc->accountname = strdup(accountname); + ppc->protocol = strdup(protocol); + ppc->privkey = NULL; + + *newkeyp = ppc; + + return gcry_error(GPG_ERR_NO_ERROR); +} + +/* Do the private key generation calculation. You may call this from a + * background thread. When it completes, call + * otrl_privkey_generate_finish from the _main_ thread. */ +gcry_error_t otrl_privkey_generate_calculate(void *newkey) +{ + struct s_pending_privkey_calc *ppc = + (struct s_pending_privkey_calc *)newkey; + gcry_error_t err; + gcry_sexp_t key, parms; + static const char *parmstr = "(genkey (dsa (nbits 4:1024)))"; + + /* Create a DSA key */ + err = gcry_sexp_new(&parms, parmstr, strlen(parmstr), 0); + if (err) { + return err; + } + err = gcry_pk_genkey(&key, parms); + gcry_sexp_release(parms); + if (err) { return err; + } + + /* Extract the privkey */ + ppc->privkey = gcry_sexp_find_token(key, "private-key", 0); + gcry_sexp_release(key); + + return gcry_error(GPG_ERR_NO_ERROR); } -/* Generate a private DSA key for a given account, storing it into a - * file on disk, and loading it into the given OtrlUserState. Overwrite any - * previously generated keys for that account in that OtrlUserState. */ -gcry_error_t otrl_privkey_generate(OtrlUserState us, const char *filename, - const char *accountname, const char *protocol) +static FILE* privkey_fopen(const char *filename, gcry_error_t *errp) { - gcry_error_t err; - FILE *privf; + FILE *privf; #ifndef WIN32 - mode_t oldmask; + mode_t oldmask; #endif #ifndef WIN32 - oldmask = umask(077); + oldmask = umask(077); #endif - privf = fopen(filename, "w+b"); - if (!privf) { + privf = fopen(filename, "w+b"); + if (!privf && errp) { + *errp = gcry_error_from_errno(errno); + } #ifndef WIN32 - umask(oldmask); + umask(oldmask); #endif - err = gcry_error_from_errno(errno); - return err; - } - - err = otrl_privkey_generate_FILEp(us, privf, accountname, protocol); + return privf; +} - fclose(privf); -#ifndef WIN32 - umask(oldmask); -#endif - return err; +/* Call this from the main thread only, in the event that the background + * thread generating the key is cancelled. The newkey is deallocated, + * and must not be used further. */ +void otrl_privkey_generate_cancelled(OtrlUserState us, void *newkey) +{ + struct s_pending_privkey_calc *ppc = + (struct s_pending_privkey_calc *)newkey; + + if (us) { + pending_forget(pending_find(us, ppc->accountname, ppc->protocol)); + } + + /* Deallocate ppc */ + free(ppc->accountname); + free(ppc->protocol); + gcry_sexp_release(ppc->privkey); + free(ppc); } -/* Generate a private DSA key for a given account, storing it into a - * FILE*, and loading it into the given OtrlUserState. Overwrite any - * previously generated keys for that account in that OtrlUserState. - * The FILE* must be open for reading and writing. */ -gcry_error_t otrl_privkey_generate_FILEp(OtrlUserState us, FILE *privf, - const char *accountname, const char *protocol) +/* Call this from the main thread only. It will write the newly created + * private key into the given file and store it in the OtrlUserState. */ +gcry_error_t otrl_privkey_generate_finish(OtrlUserState us, + void *newkey, const char *filename) { - gcry_error_t err; - gcry_sexp_t key, parms, privkey; - static const char *parmstr = "(genkey (dsa (nbits 4:1024)))"; - OtrlPrivKey *p; + gcry_error_t err; + FILE *privf = privkey_fopen(filename, &err); + if (!privf) { + return err; + } - if (!privf) return gcry_error(GPG_ERR_NO_ERROR); + err = otrl_privkey_generate_finish_FILEp(us, newkey, privf); - /* Create a DSA key */ - err = gcry_sexp_new(&parms, parmstr, strlen(parmstr), 0); - if (err) { - return err; - } - err = gcry_pk_genkey(&key, parms); - gcry_sexp_release(parms); - if (err) { - return err; - } + fclose(privf); + return err; +} - /* Extract the privkey */ - privkey = gcry_sexp_find_token(key, "private-key", 0); - gcry_sexp_release(key); +/* Call this from the main thread only. It will write the newly created + * private key into the given FILE* (which must be open for reading and + * writing) and store it in the OtrlUserState. */ +gcry_error_t otrl_privkey_generate_finish_FILEp(OtrlUserState us, + void *newkey, FILE *privf) +{ + struct s_pending_privkey_calc *ppc = + (struct s_pending_privkey_calc *)newkey; + gcry_error_t ret = gcry_error(GPG_ERR_INV_VALUE); + + if (ppc && us && privf) { + OtrlPrivKey *p; /* Output the other keys we know */ fprintf(privf, "(privkeys\n"); for (p=us->privkey_root; p; p=p->next) { - /* Skip this one if our new key replaces it */ - if (!strcmp(p->accountname, accountname) && - !strcmp(p->protocol, protocol)) { + /* Skip this one if our new key replaces it */ + if (!strcmp(p->accountname, ppc->accountname) && + !strcmp(p->protocol, ppc->protocol)) { continue; - } + } - account_write(privf, p->accountname, p->protocol, p->privkey); + account_write(privf, p->accountname, p->protocol, p->privkey); } - account_write(privf, accountname, protocol, privkey); - gcry_sexp_release(privkey); + account_write(privf, ppc->accountname, ppc->protocol, ppc->privkey); fprintf(privf, ")\n"); fseek(privf, 0, SEEK_SET); - return otrl_privkey_read_FILEp(us, privf); + ret = otrl_privkey_read_FILEp(us, privf); + } + + otrl_privkey_generate_cancelled(us, newkey); + + return ret; +} + +/* Generate a private DSA key for a given account, storing it into a + * file on disk, and loading it into the given OtrlUserState. Overwrite any + * previously generated keys for that account in that OtrlUserState. */ +gcry_error_t otrl_privkey_generate(OtrlUserState us, const char *filename, + const char *accountname, const char *protocol) +{ + gcry_error_t err; + FILE *privf = privkey_fopen(filename, &err); + if (!privf) { + return err; + } + + err = otrl_privkey_generate_FILEp(us, privf, accountname, protocol); + + fclose(privf); + return err; +} + +/* Generate a private DSA key for a given account, storing it into a + * FILE*, and loading it into the given OtrlUserState. Overwrite any + * previously generated keys for that account in that OtrlUserState. + * The FILE* must be open for reading and writing. */ +gcry_error_t otrl_privkey_generate_FILEp(OtrlUserState us, FILE *privf, + const char *accountname, const char *protocol) +{ + void *newkey = NULL; + gcry_error_t err; + + err = otrl_privkey_generate_start(us, accountname, protocol, &newkey); + if (newkey) { + otrl_privkey_generate_calculate(newkey); + err = otrl_privkey_generate_finish_FILEp(us, newkey, privf); + } + + return err; } /* Convert a hex character to a value */ static unsigned int ctoh(char c) { - if (c >= '0' && c <= '9') return c-'0'; - if (c >= 'a' && c <= 'f') return c-'a'+10; - if (c >= 'A' && c <= 'F') return c-'A'+10; - return 0; /* Unknown hex char */ + if (c >= '0' && c <= '9') return c-'0'; + if (c >= 'a' && c <= 'f') return c-'a'+10; + if (c >= 'A' && c <= 'F') return c-'A'+10; + return 0; /* Unknown hex char */ } /* Read the fingerprint store from a file on disk into the given @@ -485,19 +674,19 @@ gcry_error_t otrl_privkey_read_fingerprints(OtrlUserState us, void (*add_app_data)(void *data, ConnContext *context), void *data) { - gcry_error_t err; - FILE *storef; + gcry_error_t err; + FILE *storef; - storef = fopen(filename, "rb"); - if (!storef) { + storef = fopen(filename, "rb"); + if (!storef) { err = gcry_error_from_errno(errno); return err; - } + } - err = otrl_privkey_read_fingerprints_FILEp(us, storef, add_app_data, data); + err = otrl_privkey_read_fingerprints_FILEp(us, storef, add_app_data, data); - fclose(storef); - return err; + fclose(storef); + return err; } /* Read the fingerprint store from a FILE* into the given @@ -508,14 +697,14 @@ gcry_error_t otrl_privkey_read_fingerprints_FILEp(OtrlUserState us, void (*add_app_data)(void *data, ConnContext *context), void *data) { - ConnContext *context; - char storeline[1000]; - unsigned char fingerprint[20]; - size_t maxsize = sizeof(storeline); + ConnContext *context; + char storeline[1000]; + unsigned char fingerprint[20]; + size_t maxsize = sizeof(storeline); - if (!storef) return gcry_error(GPG_ERR_NO_ERROR); + if (!storef) return gcry_error(GPG_ERR_NO_ERROR); - while(fgets(storeline, maxsize, storef)) { + while(fgets(storeline, maxsize, storef)) { char *username; char *accountname; char *protocol; @@ -545,52 +734,52 @@ gcry_error_t otrl_privkey_read_fingerprints_FILEp(OtrlUserState us, hex = tab + 1; tab = strchr(hex, '\t'); if (!tab) { - eol = strchr(hex, '\r'); - if (!eol) eol = strchr(hex, '\n'); - if (!eol) continue; - *eol = '\0'; - trust = NULL; + eol = strchr(hex, '\r'); + if (!eol) eol = strchr(hex, '\n'); + if (!eol) continue; + *eol = '\0'; + trust = NULL; } else { - *tab = '\0'; - trust = tab + 1; - eol = strchr(trust, '\r'); - if (!eol) eol = strchr(trust, '\n'); - if (!eol) continue; - *eol = '\0'; + *tab = '\0'; + trust = tab + 1; + eol = strchr(trust, '\r'); + if (!eol) eol = strchr(trust, '\n'); + if (!eol) continue; + *eol = '\0'; } if (strlen(hex) != 40) continue; for(j=0, i=0; i<40; i+=2) { - fingerprint[j++] = (ctoh(hex[i]) << 4) + (ctoh(hex[i+1])); + fingerprint[j++] = (ctoh(hex[i]) << 4) + (ctoh(hex[i+1])); } /* Get the context for this user, adding if not yet present */ context = otrl_context_find(us, username, accountname, protocol, - 1, NULL, add_app_data, data); + OTRL_INSTAG_MASTER, 1, NULL, add_app_data, data); /* Add the fingerprint if not already there */ fng = otrl_context_find_fingerprint(context, fingerprint, 1, NULL); otrl_context_set_trust(fng, trust); - } + } - return gcry_error(GPG_ERR_NO_ERROR); + return gcry_error(GPG_ERR_NO_ERROR); } /* Write the fingerprint store from a given OtrlUserState to a file on disk. */ gcry_error_t otrl_privkey_write_fingerprints(OtrlUserState us, const char *filename) { - gcry_error_t err; - FILE *storef; + gcry_error_t err; + FILE *storef; - storef = fopen(filename, "wb"); - if (!storef) { + storef = fopen(filename, "wb"); + if (!storef) { err = gcry_error_from_errno(errno); return err; - } + } - err = otrl_privkey_write_fingerprints_FILEp(us, storef); + err = otrl_privkey_write_fingerprints_FILEp(us, storef); - fclose(storef); - return err; + fclose(storef); + return err; } /* Write the fingerprint store from a given OtrlUserState to a FILE*. @@ -598,26 +787,29 @@ gcry_error_t otrl_privkey_write_fingerprints(OtrlUserState us, gcry_error_t otrl_privkey_write_fingerprints_FILEp(OtrlUserState us, FILE *storef) { - ConnContext *context; - Fingerprint *fprint; + ConnContext *context; + Fingerprint *fprint; + + if (!storef) return gcry_error(GPG_ERR_NO_ERROR); - if (!storef) return gcry_error(GPG_ERR_NO_ERROR); + for(context = us->context_root; context; context = context->next) { + /* Fingerprints are only stored in the master contexts */ + if (context->their_instance != OTRL_INSTAG_MASTER) continue; - for(context = us->context_root; context; context = context->next) { - /* Don't both with the first (fingerprintless) entry. */ + /* Don't bother with the first (fingerprintless) entry. */ for (fprint = context->fingerprint_root.next; fprint; fprint = fprint->next) { - int i; - fprintf(storef, "%s\t%s\t%s\t", context->username, - context->accountname, context->protocol); - for(i=0;i<20;++i) { + int i; + fprintf(storef, "%s\t%s\t%s\t", context->username, + context->accountname, context->protocol); + for(i=0;i<20;++i) { fprintf(storef, "%02x", fprint->fingerprint[i]); - } - fprintf(storef, "\t%s\n", fprint->trust ? fprint->trust : ""); - } + } + fprintf(storef, "\t%s\n", fprint->trust ? fprint->trust : ""); } + } - return gcry_error(GPG_ERR_NO_ERROR); + return gcry_error(GPG_ERR_NO_ERROR); } /* Fetch the private key from the given OtrlUserState associated with @@ -625,42 +817,42 @@ gcry_error_t otrl_privkey_write_fingerprints_FILEp(OtrlUserState us, OtrlPrivKey *otrl_privkey_find(OtrlUserState us, const char *accountname, const char *protocol) { - OtrlPrivKey *p; - if (!accountname || !protocol) return NULL; + OtrlPrivKey *p; + if (!accountname || !protocol) return NULL; - for(p=us->privkey_root; p; p=p->next) { + for(p=us->privkey_root; p; p=p->next) { if (!strcmp(p->accountname, accountname) && !strcmp(p->protocol, protocol)) { - return p; + return p; } - } - return NULL; + } + return NULL; } /* Forget a private key */ void otrl_privkey_forget(OtrlPrivKey *privkey) { - free(privkey->accountname); - free(privkey->protocol); - gcry_sexp_release(privkey->privkey); - free(privkey->pubkey_data); - - /* Re-link the list */ - *(privkey->tous) = privkey->next; - if (privkey->next) { + free(privkey->accountname); + free(privkey->protocol); + gcry_sexp_release(privkey->privkey); + free(privkey->pubkey_data); + + /* Re-link the list */ + *(privkey->tous) = privkey->next; + if (privkey->next) { privkey->next->tous = privkey->tous; - } + } - /* Free the privkey struct */ - free(privkey); + /* Free the privkey struct */ + free(privkey); } /* Forget all private keys in a given OtrlUserState. */ void otrl_privkey_forget_all(OtrlUserState us) { - while (us->privkey_root) { + while (us->privkey_root) { otrl_privkey_forget(us->privkey_root); - } + } } /* Sign data using a private key. The data must be small enough to be @@ -670,45 +862,45 @@ void otrl_privkey_forget_all(OtrlUserState us) gcry_error_t otrl_privkey_sign(unsigned char **sigp, size_t *siglenp, OtrlPrivKey *privkey, const unsigned char *data, size_t len) { - gcry_mpi_t r,s, datampi; - gcry_sexp_t dsas, rs, ss, sigs, datas; - size_t nr, ns; - const enum gcry_mpi_format format = GCRYMPI_FMT_USG; + gcry_mpi_t r,s, datampi; + gcry_sexp_t dsas, rs, ss, sigs, datas; + size_t nr, ns; + const enum gcry_mpi_format format = GCRYMPI_FMT_USG; - if (privkey->pubkey_type != OTRL_PUBKEY_TYPE_DSA) + if (privkey->pubkey_type != OTRL_PUBKEY_TYPE_DSA) return gcry_error(GPG_ERR_INV_VALUE); - *sigp = malloc(40); - if (sigp == NULL) return gcry_error(GPG_ERR_ENOMEM); - *siglenp = 40; + *sigp = malloc(40); + if (*sigp == NULL) return gcry_error(GPG_ERR_ENOMEM); + *siglenp = 40; - if (len) { + if (len) { gcry_mpi_scan(&datampi, GCRYMPI_FMT_USG, data, len, NULL); - } else { + } else { datampi = gcry_mpi_set_ui(NULL, 0); - } - gcry_sexp_build(&datas, NULL, "(%m)", datampi); - gcry_mpi_release(datampi); - gcry_pk_sign(&sigs, datas, privkey->privkey); - gcry_sexp_release(datas); - dsas = gcry_sexp_find_token(sigs, "dsa", 0); - gcry_sexp_release(sigs); - rs = gcry_sexp_find_token(dsas, "r", 0); - ss = gcry_sexp_find_token(dsas, "s", 0); - gcry_sexp_release(dsas); - r = gcry_sexp_nth_mpi(rs, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(rs); - s = gcry_sexp_nth_mpi(ss, 1, GCRYMPI_FMT_USG); - gcry_sexp_release(ss); - gcry_mpi_print(format, NULL, 0, &nr, r); - gcry_mpi_print(format, NULL, 0, &ns, s); - memset(*sigp, 0, 40); - gcry_mpi_print(format, (*sigp)+(20-nr), nr, NULL, r); - gcry_mpi_print(format, (*sigp)+20+(20-ns), ns, NULL, s); - gcry_mpi_release(r); - gcry_mpi_release(s); - - return gcry_error(GPG_ERR_NO_ERROR); + } + gcry_sexp_build(&datas, NULL, "(%m)", datampi); + gcry_mpi_release(datampi); + gcry_pk_sign(&sigs, datas, privkey->privkey); + gcry_sexp_release(datas); + dsas = gcry_sexp_find_token(sigs, "dsa", 0); + gcry_sexp_release(sigs); + rs = gcry_sexp_find_token(dsas, "r", 0); + ss = gcry_sexp_find_token(dsas, "s", 0); + gcry_sexp_release(dsas); + r = gcry_sexp_nth_mpi(rs, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(rs); + s = gcry_sexp_nth_mpi(ss, 1, GCRYMPI_FMT_USG); + gcry_sexp_release(ss); + gcry_mpi_print(format, NULL, 0, &nr, r); + gcry_mpi_print(format, NULL, 0, &ns, s); + memset(*sigp, 0, 40); + gcry_mpi_print(format, (*sigp)+(20-nr), nr, NULL, r); + gcry_mpi_print(format, (*sigp)+20+(20-ns), ns, NULL, s); + gcry_mpi_release(r); + gcry_mpi_release(s); + + return gcry_error(GPG_ERR_NO_ERROR); } /* Verify a signature on data using a public key. The data must be @@ -717,33 +909,30 @@ gcry_error_t otrl_privkey_verify(const unsigned char *sigbuf, size_t siglen, unsigned short pubkey_type, gcry_sexp_t pubs, const unsigned char *data, size_t len) { - gcry_error_t err; - gcry_mpi_t datampi,r,s; - gcry_sexp_t datas, sigs; + gcry_error_t err; + gcry_mpi_t datampi,r,s; + gcry_sexp_t datas, sigs; - if (pubkey_type != OTRL_PUBKEY_TYPE_DSA || siglen != 40) + if (pubkey_type != OTRL_PUBKEY_TYPE_DSA || siglen != 40) return gcry_error(GPG_ERR_INV_VALUE); - if (len) { + if (len) { gcry_mpi_scan(&datampi, GCRYMPI_FMT_USG, data, len, NULL); - } else { + } else { datampi = gcry_mpi_set_ui(NULL, 0); - } - gcry_sexp_build(&datas, NULL, "(%m)", datampi); - gcry_mpi_release(datampi); - gcry_mpi_scan(&r, GCRYMPI_FMT_USG, sigbuf, 20, NULL); - gcry_mpi_scan(&s, GCRYMPI_FMT_USG, sigbuf+20, 20, NULL); - gcry_sexp_build(&sigs, NULL, "(sig-val (dsa (r %m)(s %m)))", r, s); - gcry_mpi_release(r); - gcry_mpi_release(s); - - err = gcry_pk_verify(sigs, datas, pubs); - gcry_sexp_release(datas); - gcry_sexp_release(sigs); - - return err; + } + gcry_sexp_build(&datas, NULL, "(%m)", datampi); + gcry_mpi_release(datampi); + gcry_mpi_scan(&r, GCRYMPI_FMT_USG, sigbuf, 20, NULL); + gcry_mpi_scan(&s, GCRYMPI_FMT_USG, sigbuf+20, 20, NULL); + gcry_sexp_build(&sigs, NULL, "(sig-val (dsa (r %m)(s %m)))", r, s); + gcry_mpi_release(r); + gcry_mpi_release(s); + + err = gcry_pk_verify(sigs, datas, pubs); + gcry_sexp_release(datas); + gcry_sexp_release(sigs); + + return err; } -gcry_error_t otrl_account_write(FILE *privf, const char *accountname, - const char *protocol, gcry_sexp_t privkey) { - return account_write(privf, accountname, protocol, privkey); -}
\ No newline at end of file + diff --git a/plugins/MirOTR/libotr/src/privkey.h b/plugins/MirOTR/libotr/src/privkey.h index 1208f54993..3b2c1735e3 100644 --- a/plugins/MirOTR/libotr/src/privkey.h +++ b/plugins/MirOTR/libotr/src/privkey.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __PRIVKEY_H__ @@ -24,16 +25,20 @@ #include "privkey-t.h" #include "userstate.h" -gcry_error_t otrl_account_write(FILE *privf, const char *accountname, - const char *protocol, gcry_sexp_t privkey); +/* The length of a string representing a human-readable version of a + * fingerprint (including the trailing NUL) */ +#define OTRL_PRIVKEY_FPRINT_HUMAN_LEN 45 /* Convert a 20-byte hash value to a 45-byte human-readable value */ -void otrl_privkey_hash_to_human(char human[45], const unsigned char hash[20]); +void otrl_privkey_hash_to_human( + char human[OTRL_PRIVKEY_FPRINT_HUMAN_LEN], + const unsigned char hash[20]); /* Calculate a human-readable hash of our DSA public key. Return it in * the passed fingerprint buffer. Return NULL on error, or a pointer to * the given buffer on success. */ -char *otrl_privkey_fingerprint(OtrlUserState us, char fingerprint[45], +char *otrl_privkey_fingerprint(OtrlUserState us, + char fingerprint[OTRL_PRIVKEY_FPRINT_HUMAN_LEN], const char *accountname, const char *protocol); /* Calculate a raw hash of our DSA public key. Return it in the passed @@ -50,6 +55,40 @@ gcry_error_t otrl_privkey_read(OtrlUserState us, const char *filename); * OtrlUserState. The FILE* must be open for reading. */ gcry_error_t otrl_privkey_read_FILEp(OtrlUserState us, FILE *privf); +/* Free the memory associated with the pending privkey list */ +void otrl_privkey_pending_forget_all(OtrlUserState us); + +/* Begin a private key generation that will potentially take place in + * a background thread. This routine must be called from the main + * thread. It will set *newkeyp, which you can pass to + * otrl_privkey_generate_calculate in a background thread. If it + * returns gcry_error(GPG_ERR_EEXIST), then a privkey creation for + * this accountname/protocol is already in progress, and *newkeyp will + * be set to NULL. */ +gcry_error_t otrl_privkey_generate_start(OtrlUserState us, + const char *accountname, const char *protocol, void **newkeyp); + +/* Do the private key generation calculation. You may call this from a + * background thread. When it completes, call + * otrl_privkey_generate_finish from the _main_ thread. */ +gcry_error_t otrl_privkey_generate_calculate(void *newkey); + +/* Call this from the main thread only. It will write the newly created + * private key into the given file and store it in the OtrlUserState. */ +gcry_error_t otrl_privkey_generate_finish(OtrlUserState us, + void *newkey, const char *filename); + +/* Call this from the main thread only. It will write the newly created + * private key into the given FILE* (which must be open for reading and + * writing) and store it in the OtrlUserState. */ +gcry_error_t otrl_privkey_generate_finish_FILEp(OtrlUserState us, + void *newkey, FILE *privf); + +/* Call this from the main thread only, in the event that the background + * thread generating the key is cancelled. The newkey is deallocated, + * and must not be used further. */ +void otrl_privkey_generate_cancelled(OtrlUserState us, void *newkey); + /* Generate a private DSA key for a given account, storing it into a * file on disk, and loading it into the given OtrlUserState. Overwrite any * previously generated keys for that account in that OtrlUserState. */ diff --git a/plugins/MirOTR/libotr/src/proto.c b/plugins/MirOTR/libotr/src/proto.c index 307ab047ff..22e50ebb20 100644 --- a/plugins/MirOTR/libotr/src/proto.c +++ b/plugins/MirOTR/libotr/src/proto.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +16,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* OTR Protocol implementation. This file should be independent of @@ -37,13 +39,19 @@ #include "tlv.h" #include "serial.h" +#define snprintf _snprintf /* Miranda NG modification */ + +#if OTRL_DEBUGGING +extern const char *OTRL_DEBUGGING_DEBUGSTR; +#endif + /* For now, we need to know the API version the client is using so that * we don't use any UI callbacks it hasn't set. */ unsigned int otrl_api_version = 0; /* Initialize the OTR library. Pass the version of the API you are * using. */ -void otrl_init(unsigned int ver_major, unsigned int ver_minor, +gcry_error_t otrl_init(unsigned int ver_major, unsigned int ver_minor, unsigned int ver_sub) { unsigned int api_version; @@ -55,7 +63,7 @@ void otrl_init(unsigned int ver_major, unsigned int ver_minor, "with actual version %u.%u.%u. Aborting.\n", ver_major, ver_minor, ver_sub, OTRL_VERSION_MAJOR, OTRL_VERSION_MINOR, OTRL_VERSION_SUB); - exit(1); + return gcry_error(GPG_ERR_INV_VALUE); } /* Set the API version. If we get called multiple times for some @@ -73,6 +81,14 @@ void otrl_init(unsigned int ver_major, unsigned int ver_minor, /* Initialize the SM module */ otrl_sm_init(); + +#if OTRL_DEBUGGING + /* Inform the user that debugging is available */ + fprintf(stderr, "\nlibotr debugging is available. Type %s in a message\n" + " to see debug info.\n\n", OTRL_DEBUGGING_DEBUGSTR); +#endif + + return gcry_error(GPG_ERR_NO_ERROR); } /* Return a pointer to a static string containing the version number of @@ -90,33 +106,37 @@ static gcry_error_t reveal_macs(ConnContext *context, sess2->rcvmacused + sess2->sendmacused; unsigned int newnumsaved; unsigned char *newmacs; - + /* Is there anything to do? */ if (numnew == 0) return gcry_error(GPG_ERR_NO_ERROR); - newnumsaved = context->numsavedkeys + numnew; - newmacs = realloc(context->saved_mac_keys, + newnumsaved = context->context_priv->numsavedkeys + numnew; + newmacs = realloc(context->context_priv->saved_mac_keys, newnumsaved * 20); if (!newmacs) { return gcry_error(GPG_ERR_ENOMEM); } if (sess1->rcvmacused) { - memmove(newmacs + context->numsavedkeys * 20, sess1->rcvmackey, 20); - context->numsavedkeys++; + memmove(newmacs + context->context_priv->numsavedkeys * 20, + sess1->rcvmackey, 20); + context->context_priv->numsavedkeys++; } if (sess1->sendmacused) { - memmove(newmacs + context->numsavedkeys * 20, sess1->sendmackey, 20); - context->numsavedkeys++; + memmove(newmacs + context->context_priv->numsavedkeys * 20, + sess1->sendmackey, 20); + context->context_priv->numsavedkeys++; } if (sess2->rcvmacused) { - memmove(newmacs + context->numsavedkeys * 20, sess2->rcvmackey, 20); - context->numsavedkeys++; + memmove(newmacs + context->context_priv->numsavedkeys * 20, + sess2->rcvmackey, 20); + context->context_priv->numsavedkeys++; } if (sess2->sendmacused) { - memmove(newmacs + context->numsavedkeys * 20, sess2->sendmackey, 20); - context->numsavedkeys++; + memmove(newmacs + context->context_priv->numsavedkeys * 20, + sess2->sendmackey, 20); + context->context_priv->numsavedkeys++; } - context->saved_mac_keys = newmacs; + context->context_priv->saved_mac_keys = newmacs; return gcry_error(GPG_ERR_NO_ERROR); } @@ -128,39 +148,44 @@ static gcry_error_t rotate_dh_keys(ConnContext *context) gcry_error_t err; /* Rotate the keypair */ - otrl_dh_keypair_free(&(context->our_old_dh_key)); - memmove(&(context->our_old_dh_key), &(context->our_dh_key), + otrl_dh_keypair_free(&(context->context_priv->our_old_dh_key)); + memmove(&(context->context_priv->our_old_dh_key), + &(context->context_priv->our_dh_key), sizeof(DH_keypair)); /* Rotate the session keys */ - err = reveal_macs(context, &(context->sesskeys[1][0]), - &(context->sesskeys[1][1])); + err = reveal_macs(context, &(context->context_priv->sesskeys[1][0]), + &(context->context_priv->sesskeys[1][1])); if (err) return err; - otrl_dh_session_free(&(context->sesskeys[1][0])); - otrl_dh_session_free(&(context->sesskeys[1][1])); - memmove(&(context->sesskeys[1][0]), &(context->sesskeys[0][0]), + otrl_dh_session_free(&(context->context_priv->sesskeys[1][0])); + otrl_dh_session_free(&(context->context_priv->sesskeys[1][1])); + memmove(&(context->context_priv->sesskeys[1][0]), + &(context->context_priv->sesskeys[0][0]), sizeof(DH_sesskeys)); - memmove(&(context->sesskeys[1][1]), &(context->sesskeys[0][1]), + memmove(&(context->context_priv->sesskeys[1][1]), + &(context->context_priv->sesskeys[0][1]), sizeof(DH_sesskeys)); /* Create a new DH key */ - otrl_dh_gen_keypair(DH1536_GROUP_ID, &(context->our_dh_key)); - context->our_keyid++; + otrl_dh_gen_keypair(DH1536_GROUP_ID, &(context->context_priv->our_dh_key)); + context->context_priv->our_keyid++; /* Make the session keys */ - if (context->their_y) { - err = otrl_dh_session(&(context->sesskeys[0][0]), - &(context->our_dh_key), context->their_y); + if (context->context_priv->their_y) { + err = otrl_dh_session(&(context->context_priv->sesskeys[0][0]), + &(context->context_priv->our_dh_key), + context->context_priv->their_y); if (err) return err; } else { - otrl_dh_session_blank(&(context->sesskeys[0][0])); + otrl_dh_session_blank(&(context->context_priv->sesskeys[0][0])); } - if (context->their_old_y) { - err = otrl_dh_session(&(context->sesskeys[0][1]), - &(context->our_dh_key), context->their_old_y); + if (context->context_priv->their_old_y) { + err = otrl_dh_session(&(context->context_priv->sesskeys[0][1]), + &(context->context_priv->our_dh_key), + context->context_priv->their_old_y); if (err) return err; } else { - otrl_dh_session_blank(&(context->sesskeys[0][1])); + otrl_dh_session_blank(&(context->context_priv->sesskeys[0][1])); } return gcry_error(GPG_ERR_NO_ERROR); } @@ -172,30 +197,34 @@ static gcry_error_t rotate_y_keys(ConnContext *context, gcry_mpi_t new_y) gcry_error_t err; /* Rotate the public key */ - gcry_mpi_release(context->their_old_y); - context->their_old_y = context->their_y; + gcry_mpi_release(context->context_priv->their_old_y); + context->context_priv->their_old_y = context->context_priv->their_y; /* Rotate the session keys */ - err = reveal_macs(context, &(context->sesskeys[0][1]), - &(context->sesskeys[1][1])); + err = reveal_macs(context, &(context->context_priv->sesskeys[0][1]), + &(context->context_priv->sesskeys[1][1])); if (err) return err; - otrl_dh_session_free(&(context->sesskeys[0][1])); - otrl_dh_session_free(&(context->sesskeys[1][1])); - memmove(&(context->sesskeys[0][1]), &(context->sesskeys[0][0]), + otrl_dh_session_free(&(context->context_priv->sesskeys[0][1])); + otrl_dh_session_free(&(context->context_priv->sesskeys[1][1])); + memmove(&(context->context_priv->sesskeys[0][1]), + &(context->context_priv->sesskeys[0][0]), sizeof(DH_sesskeys)); - memmove(&(context->sesskeys[1][1]), &(context->sesskeys[1][0]), + memmove(&(context->context_priv->sesskeys[1][1]), + &(context->context_priv->sesskeys[1][0]), sizeof(DH_sesskeys)); /* Copy in the new public key */ - context->their_y = gcry_mpi_copy(new_y); - context->their_keyid++; + context->context_priv->their_y = gcry_mpi_copy(new_y); + context->context_priv->their_keyid++; /* Make the session keys */ - err = otrl_dh_session(&(context->sesskeys[0][0]), - &(context->our_dh_key), context->their_y); + err = otrl_dh_session(&(context->context_priv->sesskeys[0][0]), + &(context->context_priv->our_dh_key), + context->context_priv->their_y); if (err) return err; - err = otrl_dh_session(&(context->sesskeys[1][0]), - &(context->our_old_dh_key), context->their_y); + err = otrl_dh_session(&(context->context_priv->sesskeys[1][0]), + &(context->context_priv->our_old_dh_key), + context->context_priv->their_y); if (err) return err; return gcry_error(GPG_ERR_NO_ERROR); @@ -207,53 +236,72 @@ static gcry_error_t rotate_y_keys(ConnContext *context, gcry_mpi_t new_y) char *otrl_proto_default_query_msg(const char *ourname, OtrlPolicy policy) { char *msg; - int v1_supported, v2_supported; - const char *version_tag; + int v1_supported, v2_supported, v3_supported; + char *version_tag; + char *bufp; /* Don't use g_strdup_printf here, because someone (not us) is going * to free() the *message pointer, not g_free() it. We can't * require that they g_free() it, because this pointer will probably * get passed to the main IM application for processing (and * free()ing). */ const char *format = "?OTR%s\n<b>%s</b> has requested an " - "<a href=\"http://otr.cypherpunks.ca/\">Off-the-Record " + "<a href=\"https://otr.cypherpunks.ca/\">Off-the-Record " "private conversation</a>. However, you do not have a plugin " - "to support that.\nSee <a href=\"http://otr.cypherpunks.ca/\">" - "http://otr.cypherpunks.ca/</a> for more information."; + "to support that.\nSee <a href=\"https://otr.cypherpunks.ca/\">" + "https://otr.cypherpunks.ca/</a> for more information."; /* Figure out the version tag */ v1_supported = (policy & OTRL_POLICY_ALLOW_V1); v2_supported = (policy & OTRL_POLICY_ALLOW_V2); + v3_supported = (policy & OTRL_POLICY_ALLOW_V3); + version_tag = malloc(8); + bufp = version_tag; if (v1_supported) { + *bufp = '?'; + bufp++; + } + if (v2_supported || v3_supported) { + *bufp = 'v'; + bufp++; if (v2_supported) { - version_tag = "?v2?"; - } else { - version_tag = "?"; + *bufp = '2'; + bufp++; } - } else { - if (v2_supported) { - version_tag = "v2?"; - } else { - version_tag = "v?"; + if (v3_supported) { + *bufp = '3'; + bufp++; } + *bufp = '?'; + bufp++; } + *bufp = '\0'; /* Remove two "%s", add '\0' */ msg = malloc(strlen(format) + strlen(version_tag) + strlen(ourname) - 3); - if (!msg) return NULL; + if (!msg) { + free(version_tag); + return NULL; + } sprintf(msg, format, version_tag, ourname); + free(version_tag); return msg; } /* Return the best version of OTR support by both sides, given an OTR * Query Message and the local policy. */ -unsigned int otrl_proto_query_bestversion(const char *querymsg, +unsigned int otrl_proto_query_bestversion(const char *otrquerymsg, OtrlPolicy policy) { char *otrtag; unsigned int query_versions = 0; - otrtag = strstr(querymsg, "?OTR"); + + otrtag = strstr(otrquerymsg, "?OTR"); + if (!otrtag) { + return 0; + } otrtag += 4; + if (*otrtag == '?') { query_versions = (1<<0); ++otrtag; @@ -264,10 +312,16 @@ unsigned int otrl_proto_query_bestversion(const char *querymsg, case '2': query_versions |= (1<<1); break; + case '3': + query_versions |= (1<<2); + break; } } } + if ((policy & OTRL_POLICY_ALLOW_V3) && (query_versions & (1<<2))) { + return 3; + } if ((policy & OTRL_POLICY_ALLOW_V2) && (query_versions & (1<<1))) { return 2; } @@ -311,6 +365,9 @@ unsigned int otrl_proto_whitespace_bestversion(const char *msg, if (!strncmp(endtag, OTRL_MESSAGE_TAG_V2, 8)) { query_versions |= (1<<1); } + if (!strncmp(endtag, OTRL_MESSAGE_TAG_V3, 8)) { + query_versions |= (1<<2); + } endtag += 8; } else { break; @@ -320,6 +377,9 @@ unsigned int otrl_proto_whitespace_bestversion(const char *msg, *starttagp = starttag; *endtagp = endtag; + if ((policy & OTRL_POLICY_ALLOW_V3) && (query_versions & (1<<2))) { + return 3; + } if ((policy & OTRL_POLICY_ALLOW_V2) && (query_versions & (1<<1))) { return 2; } @@ -329,7 +389,7 @@ unsigned int otrl_proto_whitespace_bestversion(const char *msg, return 0; } -/* Return the Message type of the given message. */ +/* Find the message type. */ OtrlMessageType otrl_proto_message_type(const char *message) { char *otrtag; @@ -344,25 +404,83 @@ OtrlMessageType otrl_proto_message_type(const char *message) } } - if (!strncmp(otrtag, "?OTR?", 5)) return OTRL_MSGTYPE_QUERY; - if (!strncmp(otrtag, "?OTRv", 5)) return OTRL_MSGTYPE_QUERY; - if (!strncmp(otrtag, "?OTR:AAIC", 9)) return OTRL_MSGTYPE_DH_COMMIT; - if (!strncmp(otrtag, "?OTR:AAIK", 9)) return OTRL_MSGTYPE_DH_KEY; - if (!strncmp(otrtag, "?OTR:AAIR", 9)) return OTRL_MSGTYPE_REVEALSIG; - if (!strncmp(otrtag, "?OTR:AAIS", 9)) return OTRL_MSGTYPE_SIGNATURE; - if (!strncmp(otrtag, "?OTR:AAEK", 9)) return OTRL_MSGTYPE_V1_KEYEXCH; - if (!strncmp(otrtag, "?OTR:AAED", 9)) return OTRL_MSGTYPE_DATA; - if (!strncmp(otrtag, "?OTR:AAID", 9)) return OTRL_MSGTYPE_DATA; - if (!strncmp(otrtag, "?OTR Error:", 11)) return OTRL_MSGTYPE_ERROR; - + if (!strncmp(otrtag, "?OTR:AAM", 8) || !strncmp(otrtag, "?OTR:AAI", 8)) { + switch(*(otrtag + 8)) { + case 'C': return OTRL_MSGTYPE_DH_COMMIT; + case 'K': return OTRL_MSGTYPE_DH_KEY; + case 'R': return OTRL_MSGTYPE_REVEALSIG; + case 'S': return OTRL_MSGTYPE_SIGNATURE; + case 'D': return OTRL_MSGTYPE_DATA; + } + } else { + if (!strncmp(otrtag, "?OTR?", 5)) return OTRL_MSGTYPE_QUERY; + if (!strncmp(otrtag, "?OTRv", 5)) return OTRL_MSGTYPE_QUERY; + if (!strncmp(otrtag, "?OTR:AAEK", 9)) return OTRL_MSGTYPE_V1_KEYEXCH; + if (!strncmp(otrtag, "?OTR:AAED", 9)) return OTRL_MSGTYPE_DATA; + if (!strncmp(otrtag, "?OTR Error:", 11)) return OTRL_MSGTYPE_ERROR; + } return OTRL_MSGTYPE_UNKNOWN; } +/* Find the message version. */ +int otrl_proto_message_version(const char *message) +{ + char *otrtag; + + otrtag = strstr(message, "?OTR"); + + if (!otrtag) { + return 0; + } + + if (!strncmp(otrtag, "?OTR:AAM", 8)) + return 3; + if (!strncmp(otrtag, "?OTR:AAI", 8)) + return 2; + if (!strncmp(otrtag, "?OTR:AAE", 8)) + return 1; + + return 0; +} + +/* Find the instance tags in this message */ +gcry_error_t otrl_proto_instance(const char *otrmsg, + unsigned int *instance_from, unsigned int *instance_to) +{ + gcry_error_t err = gcry_error(GPG_ERR_NO_ERROR); + + const char *otrtag = otrmsg; + unsigned char *bufp = NULL; + unsigned char *bufp_head = NULL; + size_t lenp; + + if (!otrtag || strncmp(otrtag, "?OTR:AAM", 8)) { + goto invval; + } + + if (strlen(otrtag) < 21 ) goto invval; + + /* Decode and extract instance tag */ + bufp = malloc(OTRL_B64_MAX_DECODED_SIZE(12)); + bufp_head = bufp; + lenp = otrl_base64_decode(bufp, otrtag+9, 12); + read_int(*instance_from); + read_int(*instance_to); + free(bufp_head); + return gcry_error(GPG_ERR_NO_ERROR); +invval: + free(bufp_head); + err = gcry_error(GPG_ERR_INV_VALUE); + return err; +} + /* Create an OTR Data message. Pass the plaintext as msg, and an * optional chain of TLVs. A newly-allocated string will be returned in - * *encmessagep. */ + * *encmessagep. Put the current extra symmetric key into extrakey + * (if non-NULL). */ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, - const char *msg, const OtrlTLV *tlvs, unsigned char flags) + const char *msg, const OtrlTLV *tlvs, unsigned char flags, + unsigned char *extrakey) { size_t justmsglen = strlen(msg); size_t msglen = justmsglen + 1 + otrl_tlv_seriallen(tlvs); @@ -371,10 +489,9 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, unsigned char *buf = NULL; unsigned char *bufp; size_t lenp; - DH_sesskeys *sess = &(context->sesskeys[1][0]); + DH_sesskeys *sess = &(context->context_priv->sesskeys[1][0]); gcry_error_t err; - size_t reveallen = 20 * context->numsavedkeys; - size_t base64len; + size_t reveallen = 20 * context->context_priv->numsavedkeys; char *base64buf = NULL; unsigned char *msgbuf = NULL; enum gcry_mpi_format format = GCRYMPI_FMT_USG; @@ -383,7 +500,7 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, /* Make sure we're actually supposed to be able to encrypt */ if (context->msgstate != OTRL_MSGSTATE_ENCRYPTED || - context->their_keyid == 0) { + context->context_priv->their_keyid == 0) { return gcry_error(GPG_ERR_CONFLICT); } @@ -397,11 +514,13 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, *encmessagep = NULL; - /* Header, send keyid, recv keyid, counter, msg len, msg + /* Header, msg flags, send keyid, recv keyid, counter, msg len, msg * len of revealed mac keys, revealed mac keys, MAC */ - buflen = 3 + (version == 2 ? 1 : 0) + 4 + 4 + 8 + 4 + msglen + - 4 + reveallen + 20; - gcry_mpi_print(format, NULL, 0, &pubkeylen, context->our_dh_key.pub); + buflen = OTRL_HEADER_LEN + (version == 3 ? 8 : 0) + + (version == 2 || version == 3 ? 1 : 0) + 4 + 4 + + 8 + 4 + msglen + 4 + reveallen + 20; + gcry_mpi_print(format, NULL, 0, &pubkeylen, + context->context_priv->our_dh_key.pub); buflen += pubkeylen + 4; buf = malloc(buflen); msgbuf = gcry_malloc_secure(msglen); @@ -417,25 +536,38 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, bufp = buf; lenp = buflen; if (version == 1) { - memcpy(bufp, "\x00\x01\x03", 3); /* header */ + memmove(bufp, "\x00\x01\x03", 3); /* header */ + } else if (version == 2) { + memmove(bufp, "\x00\x02\x03", 3); /* header */ } else { - memcpy(bufp, "\x00\x02\x03", 3); /* header */ + memmove(bufp, "\x00\x03\x03", 3); /* header */ } + debug_data("Header", bufp, 3); bufp += 3; lenp -= 3; - if (version == 2) { + + if (version == 3) { + /* v3 instance tags */ + write_int(context->our_instance); + debug_int("Sender instag", bufp-4); + write_int(context->their_instance); + debug_int("Recipient instag", bufp-4); + } + + if (version == 2 || version == 3) { bufp[0] = flags; bufp += 1; lenp -= 1; } - write_int(context->our_keyid-1); /* sender keyid */ + + write_int(context->context_priv->our_keyid-1); /* sender keyid */ debug_int("Sender keyid", bufp-4); - write_int(context->their_keyid); /* recipient keyid */ + write_int(context->context_priv->their_keyid); /* recipient keyid */ debug_int("Recipient keyid", bufp-4); - write_mpi(context->our_dh_key.pub, pubkeylen, "Y"); /* Y */ + write_mpi(context->context_priv->our_dh_key.pub, pubkeylen, "Y"); /* Y */ otrl_dh_incctr(sess->sendctr); - memcpy(bufp, sess->sendctr, 8); /* Counter (top 8 bytes only) */ + memmove(bufp, sess->sendctr, 8); /* Counter (top 8 bytes only) */ debug_data("Counter", bufp, 8); bufp += 8; lenp -= 8; @@ -454,7 +586,7 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, gcry_md_reset(sess->sendmac); gcry_md_write(sess->sendmac, buf, bufp-buf); - memcpy(bufp, gcry_md_read(sess->sendmac, GCRY_MD_SHA1), 20); + memmove(bufp, gcry_md_read(sess->sendmac, GCRY_MD_SHA1), 20); debug_data("MAC", bufp, 20); bufp += 20; /* MAC */ lenp -= 20; @@ -463,49 +595,42 @@ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, debug_int("Revealed MAC length", bufp-4); if (reveallen > 0) { - memcpy(bufp, context->saved_mac_keys, reveallen); + memmove(bufp, context->context_priv->saved_mac_keys, reveallen); debug_data("Revealed MAC data", bufp, reveallen); bufp += reveallen; lenp -= reveallen; - free(context->saved_mac_keys); - context->saved_mac_keys = NULL; - context->numsavedkeys = 0; + free(context->context_priv->saved_mac_keys); + context->context_priv->saved_mac_keys = NULL; + context->context_priv->numsavedkeys = 0; } assert(lenp == 0); /* Make the base64-encoding. */ - base64len = ((buflen + 2) / 3) * 4; - base64buf = malloc(5 + base64len + 1 + 1); + base64buf = otrl_base64_otr_encode(buf, buflen); if (base64buf == NULL) { err = gcry_error(GPG_ERR_ENOMEM); goto err; } - memcpy(base64buf, "?OTR:", 5); - otrl_base64_encode(base64buf+5, buf, buflen); - base64buf[5 + base64len] = '.'; - base64buf[5 + base64len + 1] = '\0'; free(buf); gcry_free(msgbuf); *encmessagep = base64buf; - gcry_free(context->lastmessage); - context->lastmessage = NULL; - context->may_retransmit = 0; + gcry_free(context->context_priv->lastmessage); + context->context_priv->lastmessage = NULL; + context->context_priv->may_retransmit = 0; if (msglen > 0) { - const char *prefix = "[resent] "; - size_t prefixlen = strlen(prefix); - if (!strncmp(prefix, msgdup, prefixlen)) { - /* The prefix is already there. Don't add it again. */ - prefix = ""; - prefixlen = 0; - } - context->lastmessage = gcry_malloc_secure(prefixlen + justmsglen + 1); - if (context->lastmessage) { - strcpy(context->lastmessage, prefix); - strcat(context->lastmessage, msgdup); + context->context_priv->lastmessage = gcry_malloc_secure(justmsglen + 1); + if (context->context_priv->lastmessage) { + strcpy(context->context_priv->lastmessage, msgdup); } } gcry_free(msgdup); + + /* Save a copy of the current extra key */ + if (extrakey) { + memmove(extrakey, sess->extrakey, OTRL_EXTRAKEY_BYTES); + } + return gcry_error(GPG_ERR_NO_ERROR); err: free(buf); @@ -537,26 +662,31 @@ gcry_error_t otrl_proto_data_read_flags(const char *datamsg, msglen = strlen(otrtag); } + /* Skip over the "?OTR:" */ + otrtag += 5; + msglen -= 5; + /* Base64-decode the message */ - rawlen = ((msglen-5) / 4) * 3; /* maximum possible */ + rawlen = OTRL_B64_MAX_DECODED_SIZE(msglen); /* maximum possible */ rawmsg = malloc(rawlen); if (!rawmsg && rawlen > 0) { return gcry_error(GPG_ERR_ENOMEM); } - rawlen = otrl_base64_decode(rawmsg, otrtag+5, msglen-5); /* actual size */ + rawlen = otrl_base64_decode(rawmsg, otrtag, msglen); /* actual size */ bufp = rawmsg; lenp = rawlen; require_len(3); - if (memcmp(bufp, "\x00\x01\x03", 3) && memcmp(bufp, "\x00\x02\x03", 3)) { - /* Invalid header */ - goto invval; - } version = bufp[1]; - bufp += 3; lenp -= 3; + skip_header('\x03'); - if (version == 2) { + if (version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } + + if (version == 2 || version == 3) { require_len(1); if (flagsp) *flagsp = bufp[0]; bufp += 1; lenp -= 1; @@ -572,9 +702,11 @@ invval: /* Accept an OTR Data Message in datamsg. Decrypt it and put the * plaintext into *plaintextp, and any TLVs into tlvsp. Put any - * received flags into *flagsp (if non-NULL). */ + * received flags into *flagsp (if non-NULL). Put the current extra + * symmetric key into extrakey (if non-NULL). */ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, - ConnContext *context, const char *datamsg, unsigned char *flagsp) + ConnContext *context, const char *datamsg, unsigned char *flagsp, + unsigned char *extrakey) { char *otrtag, *endtag; gcry_error_t err; @@ -606,37 +738,44 @@ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, msglen = strlen(otrtag); } + /* Skip over the "?OTR:" */ + otrtag += 5; + msglen -= 5; + /* Base64-decode the message */ - rawlen = ((msglen-5) / 4) * 3; /* maximum possible */ + rawlen = OTRL_B64_MAX_DECODED_SIZE(msglen); /* maximum possible */ rawmsg = malloc(rawlen); if (!rawmsg && rawlen > 0) { err = gcry_error(GPG_ERR_ENOMEM); goto err; } - rawlen = otrl_base64_decode(rawmsg, otrtag+5, msglen-5); /* actual size */ + rawlen = otrl_base64_decode(rawmsg, otrtag, msglen); /* actual size */ bufp = rawmsg; lenp = rawlen; macstart = bufp; require_len(3); - if (memcmp(bufp, "\x00\x01\x03", 3) && memcmp(bufp, "\x00\x02\x03", 3)) { - /* Invalid header */ - goto invval; - } version = bufp[1]; - bufp += 3; lenp -= 3; - if (version == 2) { + skip_header('\x03'); + + if (version == 3) { + require_len(8); + bufp += 8; lenp -= 8; + } + + if (version == 2 || version == 3) { require_len(1); if (flagsp) *flagsp = bufp[0]; bufp += 1; lenp -= 1; } + read_int(sender_keyid); read_int(recipient_keyid); read_mpi(sender_next_y); require_len(8); - memcpy(ctr, bufp, 8); + memmove(ctr, bufp, 8); bufp += 8; lenp -= 8; read_int(datalen); require_len(datalen); @@ -645,12 +784,12 @@ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, err = gcry_error(GPG_ERR_ENOMEM); goto err; } - memcpy(data, bufp, datalen); + memmove(data, bufp, datalen); data[datalen] = '\0'; bufp += datalen; lenp -= datalen; macend = bufp; require_len(20); - memcpy(givenmac, bufp, 20); + memmove(givenmac, bufp, 20); bufp += 20; lenp -= 20; read_int(reveallen); require_len(reveallen); @@ -664,28 +803,29 @@ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, /* We don't take any action on this message (especially rotating * keys) until we've verified the MAC on this message. To that end, * we need to know which keys this message is claiming to use. */ - if (context->their_keyid == 0 || - (sender_keyid != context->their_keyid && - sender_keyid != context->their_keyid - 1) || - (recipient_keyid != context->our_keyid && - recipient_keyid != context->our_keyid - 1) || + if (context->context_priv->their_keyid == 0 || + (sender_keyid != context->context_priv->their_keyid && + sender_keyid != context->context_priv->their_keyid - 1) || + (recipient_keyid != context->context_priv->our_keyid && + recipient_keyid != context->context_priv->our_keyid - 1) || sender_keyid == 0 || recipient_keyid == 0) { goto conflict; } - if (sender_keyid == context->their_keyid - 1 && - context->their_old_y == NULL) { + if (sender_keyid == context->context_priv->their_keyid - 1 && + context->context_priv->their_old_y == NULL) { goto conflict; } /* These are the session keys this message is claiming to use. */ - sess = &(context->sesskeys - [context->our_keyid - recipient_keyid] - [context->their_keyid - sender_keyid]); + sess = &(context->context_priv->sesskeys + [context->context_priv->our_keyid - recipient_keyid] + [context->context_priv->their_keyid - sender_keyid]); gcry_md_reset(sess->rcvmac); gcry_md_write(sess->rcvmac, macstart, macend-macstart); - if (memcmp(givenmac, gcry_md_read(sess->rcvmac, GCRY_MD_SHA1), 20)) { + if (otrl_mem_differ(givenmac, gcry_md_read(sess->rcvmac, GCRY_MD_SHA1), + 20)) { /* The MACs didn't match! */ goto conflict; } @@ -698,7 +838,7 @@ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, } /* Decrypt the message */ - memcpy(sess->rcvctr, ctr, 8); + memmove(sess->rcvctr, ctr, 8); err = gcry_cipher_reset(sess->rcvenc); if (err) goto err; err = gcry_cipher_setctr(sess->rcvenc, sess->rcvctr, 16); @@ -706,15 +846,20 @@ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, err = gcry_cipher_decrypt(sess->rcvenc, data, datalen, NULL, 0); if (err) goto err; + /* Save a copy of the current extra key */ + if (extrakey) { + memmove(extrakey, sess->extrakey, OTRL_EXTRAKEY_BYTES); + } + /* See if either set of keys needs rotating */ - if (recipient_keyid == context->our_keyid) { + if (recipient_keyid == context->context_priv->our_keyid) { /* They're using our most recent key, so generate a new one */ err = rotate_dh_keys(context); if (err) goto err; } - if (sender_keyid == context->their_keyid) { + if (sender_keyid == context->context_priv->their_keyid) { /* They've sent us a new public key */ err = rotate_y_keys(context, sender_next_y); if (err) goto err; @@ -752,77 +897,90 @@ OtrlFragmentResult otrl_proto_fragment_accumulate(char **unfragmessagep, { OtrlFragmentResult res = OTRL_FRAGMENT_INCOMPLETE; const char *tag; + unsigned short n = 0, k = 0; + int start = 0, end = 0; - tag = strstr(msg, "?OTR,"); + tag = strstr(msg, "?OTR|"); if (tag) { - unsigned short n = 0, k = 0; - int start = 0, end = 0; - + sscanf(tag, "?OTR|%*x|%*x,%hu,%hu,%n%*[^,],%n", &k, &n, &start, &end); + } else if ((tag = strstr(msg, "?OTR,")) != NULL) { sscanf(tag, "?OTR,%hu,%hu,%n%*[^,],%n", &k, &n, &start, &end); - if (k > 0 && n > 0 && k <= n && start > 0 && end > 0 && start < end) { - if (k == 1) { - int fraglen = end - start - 1; - free(context->fragment); - context->fragment = malloc(fraglen + 1); - if (fraglen + 1 > fraglen && context->fragment) { - memmove(context->fragment, tag + start, fraglen); - context->fragment_len = fraglen; - context->fragment[context->fragment_len] = '\0'; - context->fragment_n = n; - context->fragment_k = k; - } else { - free(context->fragment); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - } - } else if (n == context->fragment_n && - k == context->fragment_k + 1) { - int fraglen = end - start - 1; - char *newfrag = realloc(context->fragment, - context->fragment_len + fraglen + 1); - if (context->fragment_len + fraglen + 1 > fraglen && newfrag) { - context->fragment = newfrag; - memmove(context->fragment + context->fragment_len, - tag + start, fraglen); - context->fragment_len += fraglen; - context->fragment[context->fragment_len] = '\0'; - context->fragment_k = k; - } else { - free(context->fragment); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - } + } else { + /* Unfragmented message, so discard any fragment we may have */ + free(context->context_priv->fragment); + context->context_priv->fragment = NULL; + context->context_priv->fragment_len = 0; + context->context_priv->fragment_n = 0; + context->context_priv->fragment_k = 0; + res = OTRL_FRAGMENT_UNFRAGMENTED; + return res; + } + + if (k > 0 && n > 0 && k <= n && start > 0 && end > 0 && start < end) { + if (k == 1) { + int fraglen = end - start - 1; + size_t newsize = fraglen + 1; + free(context->context_priv->fragment); + context->context_priv->fragment = NULL; + if (newsize >= 1) { /* Check for overflow */ + context->context_priv->fragment = malloc(newsize); + } + if (context->context_priv->fragment) { + memmove(context->context_priv->fragment, tag + start, fraglen); + context->context_priv->fragment_len = fraglen; + context->context_priv->fragment[ + context->context_priv->fragment_len] = '\0'; + context->context_priv->fragment_n = n; + context->context_priv->fragment_k = k; } else { - free(context->fragment); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; + context->context_priv->fragment_len = 0; + context->context_priv->fragment_n = 0; + context->context_priv->fragment_k = 0; + } + } else if (n == context->context_priv->fragment_n && + k == context->context_priv->fragment_k + 1) { + int fraglen = end - start - 1; + char *newfrag = NULL; + size_t newsize = context->context_priv->fragment_len + fraglen + 1; + /* Check for overflow */ + if (newsize > context->context_priv->fragment_len) { + newfrag = realloc(context->context_priv->fragment, newsize); } + if (newfrag) { + context->context_priv->fragment = newfrag; + memmove(context->context_priv->fragment + + context->context_priv->fragment_len, + tag + start, fraglen); + context->context_priv->fragment_len += fraglen; + context->context_priv->fragment[ + context->context_priv->fragment_len] = '\0'; + context->context_priv->fragment_k = k; + } else { + free(context->context_priv->fragment); + context->context_priv->fragment = NULL; + context->context_priv->fragment_len = 0; + context->context_priv->fragment_n = 0; + context->context_priv->fragment_k = 0; + } + } else { + free(context->context_priv->fragment); + context->context_priv->fragment = NULL; + context->context_priv->fragment_len = 0; + context->context_priv->fragment_n = 0; + context->context_priv->fragment_k = 0; } + } - if (context->fragment_n > 0 && - context->fragment_n == context->fragment_k) { - /* We've got a complete message */ - *unfragmessagep = context->fragment; - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - res = OTRL_FRAGMENT_COMPLETE; - } - } else { - /* Unfragmented message, so discard any fragment we may have */ - free(context->fragment); - context->fragment = NULL; - context->fragment_len = 0; - context->fragment_n = 0; - context->fragment_k = 0; - res = OTRL_FRAGMENT_UNFRAGMENTED; + if (context->context_priv->fragment_n > 0 && + context->context_priv->fragment_n == + context->context_priv->fragment_k) { + /* We've got a complete message */ + *unfragmessagep = context->context_priv->fragment; + context->context_priv->fragment = NULL; + context->context_priv->fragment_len = 0; + context->context_priv->fragment_n = 0; + context->context_priv->fragment_k = 0; + res = OTRL_FRAGMENT_COMPLETE; } return res; @@ -830,60 +988,79 @@ OtrlFragmentResult otrl_proto_fragment_accumulate(char **unfragmessagep, /* Create a fragmented message. */ gcry_error_t otrl_proto_fragment_create(int mms, int fragment_count, - char ***fragments, const char *message) + char ***fragments, ConnContext *context, const char *message) { char *fragdata; int fragdatalen = 0; - unsigned short curfrag = 0; + int curfrag = 0; int index = 0; int msglen = strlen(message); - int headerlen = 19; /* Should vary by number of msgs */ + /* Should vary by number of msgs */ + int headerlen = context->protocol_version == 3 ? 37 : 19; + + char **fragmentarray; - char **fragmentarray = malloc(fragment_count * sizeof(char*)); + if (fragment_count < 1 || fragment_count > 65535) { + return gcry_error(GPG_ERR_INV_VALUE); + } + + fragmentarray = malloc(fragment_count * sizeof(char*)); if(!fragmentarray) return gcry_error(GPG_ERR_ENOMEM); - + /* * Find the next message fragment and store it in the array. */ for(curfrag = 1; curfrag <= fragment_count; curfrag++) { int i; - char *fragmentmsg; + char *fragmentmsg; if (msglen - index < mms - headerlen) { - fragdatalen = msglen - index; + fragdatalen = msglen - index; } else { fragdatalen = mms - headerlen; } + fragdata = malloc(fragdatalen + 1); - if(!fragdata) { + if(!fragdata) { for (i=0; i<curfrag-1; free(fragmentarray[i++])) {} - free(fragmentarray); - return gcry_error(GPG_ERR_ENOMEM); - } - strncpy(fragdata, message, fragdatalen); - fragdata[fragdatalen] = 0; - - fragmentmsg = malloc(fragdatalen+headerlen+1); - if(!fragmentmsg) { + free(fragmentarray); + return gcry_error(GPG_ERR_ENOMEM); + } + strncpy(fragdata, message, fragdatalen); + fragdata[fragdatalen] = 0; + + fragmentmsg = malloc(fragdatalen+headerlen+1); + if(!fragmentmsg) { for (i=0; i<curfrag-1; free(fragmentarray[i++])) {} - free(fragmentarray); - free(fragdata); - return gcry_error(GPG_ERR_ENOMEM); - } - - /* - * Create the actual fragment and store it in the array - */ - _snprintf(fragmentmsg, fragdatalen + headerlen, "?OTR,%05hu,%05hu,%s,", curfrag, fragment_count, fragdata); - fragmentmsg[fragdatalen + headerlen] = 0; - - fragmentarray[curfrag-1] = fragmentmsg; - - free(fragdata); - index += fragdatalen; + free(fragmentarray); + free(fragdata); + return gcry_error(GPG_ERR_ENOMEM); + } + + /* + * Create the actual fragment and store it in the array + */ + if (context->auth.protocol_version != 3) { + snprintf(fragmentmsg, fragdatalen + headerlen, + "?OTR,%05hu,%05hu,%s,", (unsigned short)curfrag, + (unsigned short)fragment_count, fragdata); + } else { + /* V3 messages require instance tags in the header */ + snprintf(fragmentmsg, fragdatalen + headerlen, + "?OTR|%08x|%08x,%05hu,%05hu,%s,", + context->our_instance, context->their_instance, + (unsigned short)curfrag, (unsigned short)fragment_count, + fragdata); + } + fragmentmsg[fragdatalen + headerlen] = 0; + + fragmentarray[curfrag-1] = fragmentmsg; + + free(fragdata); + index += fragdatalen; message += fragdatalen; } - + *fragments = fragmentarray; return gcry_error(GPG_ERR_NO_ERROR); } @@ -897,7 +1074,7 @@ void otrl_proto_fragment_free(char ***fragments, unsigned short arraylen) for(i = 0; i < arraylen; i++) { if(fragmentarray[i]) { - free(fragmentarray[i]); + free(fragmentarray[i]); } } free(fragmentarray); diff --git a/plugins/MirOTR/libotr/src/proto.h b/plugins/MirOTR/libotr/src/proto.h index d7b0ae6f90..28be83f439 100644 --- a/plugins/MirOTR/libotr/src/proto.h +++ b/plugins/MirOTR/libotr/src/proto.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __PROTO_H__ @@ -30,6 +31,7 @@ /* The following must each be of length 8 */ #define OTRL_MESSAGE_TAG_V1 " \t \t \t " #define OTRL_MESSAGE_TAG_V2 " \t\t \t " +#define OTRL_MESSAGE_TAG_V3 " \t\t \t\t" /* The possible flags contained in a Data Message */ #define OTRL_MSGFLAGS_IGNORE_UNREADABLE 0x01 @@ -38,27 +40,33 @@ typedef unsigned int OtrlPolicy; #define OTRL_POLICY_ALLOW_V1 0x01 #define OTRL_POLICY_ALLOW_V2 0x02 -#define OTRL_POLICY_REQUIRE_ENCRYPTION 0x04 -#define OTRL_POLICY_SEND_WHITESPACE_TAG 0x08 -#define OTRL_POLICY_WHITESPACE_START_AKE 0x10 -#define OTRL_POLICY_ERROR_START_AKE 0x20 +#define OTRL_POLICY_ALLOW_V3 0x04 +#define OTRL_POLICY_REQUIRE_ENCRYPTION 0x08 +#define OTRL_POLICY_SEND_WHITESPACE_TAG 0x10 +#define OTRL_POLICY_WHITESPACE_START_AKE 0x20 +#define OTRL_POLICY_ERROR_START_AKE 0x40 -#define OTRL_POLICY_VERSION_MASK (OTRL_POLICY_ALLOW_V1 | OTRL_POLICY_ALLOW_V2) +#define OTRL_POLICY_VERSION_MASK (OTRL_POLICY_ALLOW_V1 | OTRL_POLICY_ALLOW_V2 |\ + OTRL_POLICY_ALLOW_V3) -/* For v1 compatibility */ +/* Length of OTR message headers */ +#define OTRL_HEADER_LEN 3 +#define OTRL_B64_HEADER_LEN 4 + +/* Analogous to v1 policies */ #define OTRL_POLICY_NEVER 0x00 #define OTRL_POLICY_OPPORTUNISTIC \ - ( OTRL_POLICY_ALLOW_V1 | \ - OTRL_POLICY_ALLOW_V2 | \ + ( OTRL_POLICY_ALLOW_V2 | \ + OTRL_POLICY_ALLOW_V3 | \ OTRL_POLICY_SEND_WHITESPACE_TAG | \ OTRL_POLICY_WHITESPACE_START_AKE | \ OTRL_POLICY_ERROR_START_AKE ) #define OTRL_POLICY_MANUAL \ - ( OTRL_POLICY_ALLOW_V1 | \ - OTRL_POLICY_ALLOW_V2 ) + ( OTRL_POLICY_ALLOW_V2 | \ + OTRL_POLICY_ALLOW_V3) #define OTRL_POLICY_ALWAYS \ - ( OTRL_POLICY_ALLOW_V1 | \ - OTRL_POLICY_ALLOW_V2 | \ + ( OTRL_POLICY_ALLOW_V2 | \ + OTRL_POLICY_ALLOW_V3 | \ OTRL_POLICY_REQUIRE_ENCRYPTION | \ OTRL_POLICY_WHITESPACE_START_AKE | \ OTRL_POLICY_ERROR_START_AKE ) @@ -85,6 +93,8 @@ typedef enum { } OtrlFragmentResult; typedef enum { + OTRL_FRAGMENT_SEND_SKIP, /* Return new message back to caller, + * but don't inject. */ OTRL_FRAGMENT_SEND_ALL, OTRL_FRAGMENT_SEND_ALL_BUT_FIRST, OTRL_FRAGMENT_SEND_ALL_BUT_LAST @@ -92,12 +102,15 @@ typedef enum { /* Initialize the OTR library. Pass the version of the API you are * using. */ -void otrl_init(unsigned int ver_major, unsigned int ver_minor, +gcry_error_t otrl_init(unsigned int ver_major, unsigned int ver_minor, unsigned int ver_sub); /* Shortcut */ #define OTRL_INIT do { \ - otrl_init(OTRL_VERSION_MAJOR, OTRL_VERSION_MINOR, OTRL_VERSION_SUB); \ + if (otrl_init(OTRL_VERSION_MAJOR, OTRL_VERSION_MINOR, \ + OTRL_VERSION_SUB)) { \ + exit(1); \ + } \ } while(0) /* Return a pointer to a static string containing the version number of @@ -120,14 +133,23 @@ unsigned int otrl_proto_query_bestversion(const char *querymsg, unsigned int otrl_proto_whitespace_bestversion(const char *msg, const char **starttagp, const char **endtagp, OtrlPolicy policy); -/* Return the Message type of the given message. */ +/* Find the message type. */ OtrlMessageType otrl_proto_message_type(const char *message); +/* Find the message version. */ +int otrl_proto_message_version(const char *message); + +/* Find the instance tags in this message. */ +gcry_error_t otrl_proto_instance(const char *otrmsg, + unsigned int *instance_from, unsigned int *instance_to); + /* Create an OTR Data message. Pass the plaintext as msg, and an * optional chain of TLVs. A newly-allocated string will be returned in - * *encmessagep. */ + * *encmessagep. Put the current extra symmetric key into extrakey + * (if non-NULL). */ gcry_error_t otrl_proto_create_data(char **encmessagep, ConnContext *context, - const char *msg, const OtrlTLV *tlvs, unsigned char flags); + const char *msg, const OtrlTLV *tlvs, unsigned char flags, + unsigned char *extrakey); /* Extract the flags from an otherwise unreadable Data Message. */ gcry_error_t otrl_proto_data_read_flags(const char *datamsg, @@ -135,16 +157,18 @@ gcry_error_t otrl_proto_data_read_flags(const char *datamsg, /* Accept an OTR Data Message in datamsg. Decrypt it and put the * plaintext into *plaintextp, and any TLVs into tlvsp. Put any - * received flags into *flagsp (if non-NULL). */ + * received flags into *flagsp (if non-NULL). Put the current extra + * symmetric key into extrakey (if non-NULL). */ gcry_error_t otrl_proto_accept_data(char **plaintextp, OtrlTLV **tlvsp, - ConnContext *context, const char *datamsg, unsigned char *flagsp); + ConnContext *context, const char *datamsg, unsigned char *flagsp, + unsigned char *extrakey); /* Accumulate a potential fragment into the current context. */ OtrlFragmentResult otrl_proto_fragment_accumulate(char **unfragmessagep, ConnContext *context, const char *msg); gcry_error_t otrl_proto_fragment_create(int mms, int fragment_count, - char ***fragments, const char *message); + char ***fragments, ConnContext *context, const char *message); void otrl_proto_fragment_free(char ***fragments, unsigned short arraylen); #endif diff --git a/plugins/MirOTR/libotr/src/serial.h b/plugins/MirOTR/libotr/src/serial.h index edc31847e1..cd2442b332 100644 --- a/plugins/MirOTR/libotr/src/serial.h +++ b/plugins/MirOTR/libotr/src/serial.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __SERIAL_H__ @@ -36,7 +37,7 @@ #define debug_int(t,b) do { const unsigned char *data = (b); \ unsigned int v = \ - (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \ + (((unsigned int)data[0]) << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \ fprintf(stderr, "%s: %u (0x%x)\n", (t), v, v); \ } while(0) @@ -66,7 +67,7 @@ #define read_int(x) do { \ require_len(4); \ - (x) = (bufp[0] << 24) | (bufp[1] << 16) | (bufp[2] << 8) | bufp[3]; \ + (x) = (((unsigned int)bufp[0]) << 24) | (bufp[1] << 16) | (bufp[2] << 8) | bufp[3]; \ bufp += 4; lenp -= 4; \ } while(0) @@ -82,4 +83,25 @@ bufp += mpilen; lenp -= mpilen; \ } while(0) +/* Write version and msg type into bufp*/ +#define write_header(version, msgtype) do { \ + bufp[0] = 0x00; \ + bufp[1] = version & 0xff; \ + bufp[2] = msgtype; \ + debug_data("Header", bufp, 3); \ + bufp += 3; lenp -= 3; \ + } while(0) + +/* Verify msg header is v1, v2 or v3 and has type x, +* increment bufp past msg header */ +#define skip_header(x) do { \ + require_len(3); \ + if ((bufp[0] != 0x00) || (bufp[2] != x)) \ + goto invval; \ + if ((bufp[1] == 0x01) || (bufp[1] == 0x02) || \ + (bufp[1] == 0x03)) { \ + bufp += 3; lenp -= 3; \ + } else goto invval; \ + } while(0) + #endif diff --git a/plugins/MirOTR/libotr/src/sm.c b/plugins/MirOTR/libotr/src/sm.c index 535ae2243c..4fb679ea81 100644 --- a/plugins/MirOTR/libotr/src/sm.c +++ b/plugins/MirOTR/libotr/src/sm.c @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,13 +16,13 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ #include <stdlib.h> #include <stdio.h> -#include <sys/types.h> +#include <sys/types.h> /* libgcrypt headers */ #include <gcrypt.h> @@ -29,6 +31,30 @@ #include "sm.h" #include "serial.h" +#if OTRL_DEBUGGING + +/* Dump the contents of an SMState to the FILE *f. */ +void otrl_sm_dump(FILE *f, const OtrlSMState *sm) +{ + fprintf(f, " SM state:\n"); + fprintf(f, " Next expected: %d (%s)\n", sm->nextExpected, + sm->nextExpected == OTRL_SMP_EXPECT1 ? "EXPECT1" : + sm->nextExpected == OTRL_SMP_EXPECT2 ? "EXPECT2" : + sm->nextExpected == OTRL_SMP_EXPECT3 ? "EXPECT3" : + sm->nextExpected == OTRL_SMP_EXPECT4 ? "EXPECT4" : + sm->nextExpected == OTRL_SMP_EXPECT5 ? "EXPECT5" : + "INVALID"); + fprintf(f, " Received_Q: %d\n", sm->received_question); + fprintf(f, " Progress state: %d (%s)\n", sm->sm_prog_state, + sm->sm_prog_state == OTRL_SMP_PROG_OK ? "OK" : + sm->sm_prog_state == OTRL_SMP_PROG_CHEATED ? "CHEATED" : + sm->sm_prog_state == OTRL_SMP_PROG_FAILED ? "FAILED" : + sm->sm_prog_state == OTRL_SMP_PROG_SUCCEEDED ? "SUCCEEDED" : + "INVALID"); +} + +#endif + static const int SM_MSG1_LEN = 6; static const int SM_MSG2_LEN = 11; static const int SM_MSG3_LEN = 8; @@ -70,10 +96,12 @@ static gcry_mpi_t SM_MODULUS_MINUS_2 = NULL; void otrl_sm_init(void) { gcry_check_version(NULL); - gcry_mpi_scan(&SM_MODULUS, GCRYMPI_FMT_HEX, SM_MODULUS_S, 0, NULL); - gcry_mpi_scan(&SM_ORDER, GCRYMPI_FMT_HEX, SM_ORDER_S, 0, NULL); - gcry_mpi_scan(&SM_GENERATOR, GCRYMPI_FMT_HEX, SM_GENERATOR_S, - 0, NULL); + gcry_mpi_scan(&SM_MODULUS, GCRYMPI_FMT_HEX, + (const unsigned char *)SM_MODULUS_S, 0, NULL); + gcry_mpi_scan(&SM_ORDER, GCRYMPI_FMT_HEX, + (const unsigned char *)SM_ORDER_S, 0, NULL); + gcry_mpi_scan(&SM_GENERATOR, GCRYMPI_FMT_HEX, + (const unsigned char *)SM_GENERATOR_S, 0, NULL); SM_MODULUS_MINUS_2 = gcry_mpi_new(SM_MOD_LEN_BITS); gcry_mpi_sub_ui(SM_MODULUS_MINUS_2, SM_MODULUS, 2); } @@ -106,7 +134,7 @@ void otrl_sm_state_new(OtrlSMState *smst) void otrl_sm_state_init(OtrlSMState *smst) { otrl_sm_state_free(smst); - smst->secret = gcry_mpi_new(SM_MOD_LEN_BITS); + smst->secret = gcry_mpi_snew(SM_MOD_LEN_BITS); smst->x2 = NULL; smst->x3 = NULL; smst->g1 = gcry_mpi_copy(SM_GENERATOR); @@ -156,7 +184,7 @@ void otrl_sm_msg2_init(gcry_mpi_t **msg2) msg[7] = gcry_mpi_new(SM_MOD_LEN_BITS); msg[8] = NULL; msg[9] = gcry_mpi_new(SM_MOD_LEN_BITS); - msg[10] = gcry_mpi_new(SM_MOD_LEN_BITS); + msg[10] = gcry_mpi_new(SM_MOD_LEN_BITS); *msg2 = msg; } @@ -223,7 +251,7 @@ void otrl_sm_msg_free(gcry_mpi_t **message, int msglen) gcry_mpi_t *msg = *message; int i; for (i=0; i<msglen; i++) { - gcry_mpi_release(msg[i]); + gcry_mpi_release(msg[i]); } free(msg); *message = NULL; @@ -255,7 +283,7 @@ static gcry_error_t otrl_sm_hash(gcry_mpi_t* hash, int version, size_t totalsize; unsigned char* dataa; unsigned char* datab; - + gcry_mpi_aprint(GCRYMPI_FMT_USG, &dataa, &sizea, a); totalsize = 1 + 4 + sizea; if (b) { @@ -306,9 +334,9 @@ static gcry_error_t serialize_mpi_array(unsigned char **buffer, int *buflen, unsigned char *bufp; for (i=0; i<count; i++) { - gcry_mpi_aprint(GCRYMPI_FMT_USG, &(tempbuffer[i]), &(list_sizes[i]), + gcry_mpi_aprint(GCRYMPI_FMT_USG, &(tempbuffer[i]), &(list_sizes[i]), mpis[i]); - totalsize += list_sizes[i]; + totalsize += list_sizes[i]; } *buflen = (count+1)*4 + totalsize; @@ -320,15 +348,15 @@ static gcry_error_t serialize_mpi_array(unsigned char **buffer, int *buflen, write_int(count); for(i=0; i<count; i++) { - nextsize = list_sizes[i]; - write_int(nextsize); - - for(j=0; j<nextsize; j++) - bufp[j] = tempbuffer[i][j]; - + nextsize = list_sizes[i]; + write_int(nextsize); + + for(j=0; j<nextsize; j++) + bufp[j] = tempbuffer[i][j]; + bufp += nextsize; - lenp -= nextsize; - gcry_free(tempbuffer[i]); + lenp -= nextsize; + gcry_free(tempbuffer[i]); } free(tempbuffer); free(list_sizes); @@ -344,8 +372,8 @@ static gcry_error_t serialize_mpi_array(unsigned char **buffer, int *buflen, static gcry_error_t unserialize_mpi_array(gcry_mpi_t **mpis, unsigned int expcount, const unsigned char *buffer, const int buflen) { - int i; - int lenp = buflen; + unsigned int i; + size_t lenp = buflen; unsigned int thecount = 0; const unsigned char* bufp = buffer; *mpis = NULL; @@ -400,10 +428,11 @@ static int check_expon(gcry_mpi_t x) /* * Proof of knowledge of a discrete logarithm */ -static gcry_error_t otrl_sm_proof_know_log(gcry_mpi_t *c, gcry_mpi_t *d, const gcry_mpi_t g, const gcry_mpi_t x, int version) +static gcry_error_t otrl_sm_proof_know_log(gcry_mpi_t *c, gcry_mpi_t *d, + const gcry_mpi_t g, const gcry_mpi_t x, int version) { gcry_mpi_t r = randomExponent(); - gcry_mpi_t temp = gcry_mpi_new(SM_MOD_LEN_BITS); + gcry_mpi_t temp = gcry_mpi_snew(SM_MOD_LEN_BITS); gcry_mpi_powm(temp, g, r, SM_MODULUS); otrl_sm_hash(c, version, temp, NULL); gcry_mpi_mulm(temp, x, *c, SM_ORDER); @@ -415,9 +444,11 @@ static gcry_error_t otrl_sm_proof_know_log(gcry_mpi_t *c, gcry_mpi_t *d, const g } /* - * Verify a proof of knowledge of a discrete logarithm. Checks that c = h(g^d x^c) + * Verify a proof of knowledge of a discrete logarithm. + * Checks that c = h(g^d x^c) */ -static int otrl_sm_check_know_log(const gcry_mpi_t c, const gcry_mpi_t d, const gcry_mpi_t g, const gcry_mpi_t x, int version) +static int otrl_sm_check_know_log(const gcry_mpi_t c, const gcry_mpi_t d, + const gcry_mpi_t g, const gcry_mpi_t x, int version) { int comp; @@ -430,7 +461,7 @@ static int otrl_sm_check_know_log(const gcry_mpi_t c, const gcry_mpi_t d, const gcry_mpi_powm(xc, x, c, SM_MODULUS); gcry_mpi_mulm(gdxc, gd, xc, SM_MODULUS); otrl_sm_hash(&hgdxc, version, gdxc, NULL); - + comp = gcry_mpi_cmp(hgdxc, c); gcry_mpi_release(gd); gcry_mpi_release(xc); @@ -443,7 +474,9 @@ static int otrl_sm_check_know_log(const gcry_mpi_t c, const gcry_mpi_t d, const /* * Proof of knowledge of coordinates with first components being equal */ -static gcry_error_t otrl_sm_proof_equal_coords(gcry_mpi_t *c, gcry_mpi_t *d1, gcry_mpi_t *d2, const OtrlSMState *state, const gcry_mpi_t r, int version) +static gcry_error_t otrl_sm_proof_equal_coords(gcry_mpi_t *c, gcry_mpi_t *d1, + gcry_mpi_t *d2, const OtrlSMState *state, const gcry_mpi_t r, + int version) { gcry_mpi_t r1 = randomExponent(); gcry_mpi_t r2 = randomExponent(); @@ -475,7 +508,9 @@ static gcry_error_t otrl_sm_proof_equal_coords(gcry_mpi_t *c, gcry_mpi_t *d1, gc /* * Verify a proof of knowledge of coordinates with first components being equal */ -static gcry_error_t otrl_sm_check_equal_coords(const gcry_mpi_t c, const gcry_mpi_t d1, const gcry_mpi_t d2, const gcry_mpi_t p, const gcry_mpi_t q, const OtrlSMState *state, int version) +static gcry_error_t otrl_sm_check_equal_coords(const gcry_mpi_t c, + const gcry_mpi_t d1, const gcry_mpi_t d2, const gcry_mpi_t p, + const gcry_mpi_t q, const OtrlSMState *state, int version) { int comp; @@ -518,7 +553,8 @@ static gcry_error_t otrl_sm_check_equal_coords(const gcry_mpi_t c, const gcry_mp /* * Proof of knowledge of logs with exponents being equal */ -static gcry_error_t otrl_sm_proof_equal_logs(gcry_mpi_t *c, gcry_mpi_t *d, OtrlSMState *state, int version) +static gcry_error_t otrl_sm_proof_equal_logs(gcry_mpi_t *c, gcry_mpi_t *d, + OtrlSMState *state, int version) { gcry_mpi_t r = randomExponent(); gcry_mpi_t temp1 = gcry_mpi_new(SM_MOD_LEN_BITS); @@ -543,7 +579,9 @@ static gcry_error_t otrl_sm_proof_equal_logs(gcry_mpi_t *c, gcry_mpi_t *d, OtrlS /* * Verify a proof of knowledge of logs with exponents being equal */ -static gcry_error_t otrl_sm_check_equal_logs(const gcry_mpi_t c, const gcry_mpi_t d, const gcry_mpi_t r, const OtrlSMState *state, int version) +static gcry_error_t otrl_sm_check_equal_logs(const gcry_mpi_t c, + const gcry_mpi_t d, const gcry_mpi_t r, const OtrlSMState *state, + int version) { int comp; @@ -555,7 +593,7 @@ static gcry_error_t otrl_sm_check_equal_logs(const gcry_mpi_t c, const gcry_mpi_ /* Here, we recall the exponents used to create g3. * If we have previously seen g3o = g1^x where x is unknown * during the DH exchange to produce g3, then we may proceed with: - * + * * To verify, we test that hash(g1^d * g3o^c, qab^d * r^c) = c * If indeed c = hash(g1^r1, qab^r1), d = r1- x * c * And if indeed r = qab^x @@ -601,11 +639,11 @@ gcry_error_t otrl_sm_step1(OtrlSMAliceState *astate, *output = NULL; *outputlen = 0; - + gcry_mpi_scan(&secret_mpi, GCRYMPI_FMT_USG, secret, secretlen, NULL); if (! astate->g1) { - otrl_sm_state_init(astate); + otrl_sm_state_init(astate); } gcry_mpi_set(astate->secret, secret_mpi); gcry_mpi_release(secret_mpi); @@ -631,7 +669,8 @@ gcry_error_t otrl_sm_step1(OtrlSMAliceState *astate, /* Receive the first message in SMP exchange, which was generated by * otrl_sm_step1. Input is saved until the user inputs their secret * information. No output. */ -gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, int received_question) +gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, + const int inputlen, int received_question) { gcry_mpi_t *msg1; gcry_error_t err; @@ -645,21 +684,23 @@ gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, /* Read from input to find the mpis */ err = unserialize_mpi_array(&msg1, SM_MSG1_LEN, input, inputlen); - + if (err != gcry_error(GPG_ERR_NO_ERROR)) return err; if (check_group_elem(msg1[0]) || check_expon(msg1[2]) || check_group_elem(msg1[3]) || check_expon(msg1[5])) { - return gcry_error(GPG_ERR_INV_VALUE); + otrl_sm_msg_free(&msg1, SM_MSG1_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } /* Store Alice's g3a value for later in the protocol */ gcry_mpi_set(bstate->g3o, msg1[3]); - + /* Verify Alice's proofs */ - if (otrl_sm_check_know_log(msg1[1], msg1[2], bstate->g1, msg1[0], 1) || - otrl_sm_check_know_log(msg1[4], msg1[5], bstate->g1, msg1[3], 2)) { - return gcry_error(GPG_ERR_INV_VALUE); + if (otrl_sm_check_know_log(msg1[1], msg1[2], bstate->g1, msg1[0], 1) || + otrl_sm_check_know_log(msg1[4], msg1[5], bstate->g1, msg1[3], 2)) { + otrl_sm_msg_free(&msg1, SM_MSG1_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } /* Create Bob's half of the generators g2 and g3 */ @@ -671,6 +712,8 @@ gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, gcry_mpi_powm(bstate->g3, msg1[3], bstate->x3, SM_MODULUS); bstate->sm_prog_state = OTRL_SMP_PROG_OK; + + otrl_sm_msg_free(&msg1, SM_MSG1_LEN); return gcry_error(GPG_ERR_NO_ERROR); } @@ -684,7 +727,8 @@ gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, * [4] = c3, [5] = d3, Bob's ZK proof of knowledge of g3b exponent * [6] = pb, [7] = qb, Bob's halves of the (Pa/Pb) and (Qa/Qb) values * [8] = cp, [9] = d5, [10] = d6, Bob's ZK proof that pb, qb formed correctly */ -gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, int secretlen, unsigned char **output, int* outputlen) +gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, + int secretlen, unsigned char **output, int* outputlen) { /* Convert the given secret to the proper form and store it */ gcry_mpi_t r, qb1, qb2; @@ -693,7 +737,7 @@ gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, *output = NULL; *outputlen = 0; - + gcry_mpi_scan(&secret_mpi, GCRYMPI_FMT_USG, secret, secretlen, NULL); gcry_mpi_set(bstate->secret, secret_mpi); gcry_mpi_release(secret_mpi); @@ -717,7 +761,8 @@ gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, gcry_mpi_mulm(bstate->q, qb1, qb2, SM_MODULUS); gcry_mpi_set(msg2[7], bstate->q); - otrl_sm_proof_equal_coords(&(msg2[8]), &(msg2[9]), &(msg2[10]), bstate, r, 5); + otrl_sm_proof_equal_coords(&(msg2[8]), &(msg2[9]), + &(msg2[10]), bstate, r, 5); /* Convert to serialized form */ serialize_mpi_array(output, outputlen, SM_MSG2_LEN, msg2); @@ -738,18 +783,19 @@ gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, * [2] = cp, [3] = d5, [4] = d6, Alice's ZK proof that pa, qa formed correctly * [5] = ra, calculated as (Qa/Qb)^x3 where x3 is the exponent used in g3a * [6] = cr, [7] = d7, Alice's ZK proof that ra is formed correctly */ -gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen) +gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, + const int inputlen, unsigned char **output, int* outputlen) { /* Read from input to find the mpis */ gcry_mpi_t r, qa1, qa2, inv; gcry_mpi_t *msg2; gcry_mpi_t *msg3; gcry_error_t err; - + *output = NULL; *outputlen = 0; astate->sm_prog_state = OTRL_SMP_PROG_CHEATED; - + err = unserialize_mpi_array(&msg2, SM_MSG2_LEN, input, inputlen); if (err != gcry_error(GPG_ERR_NO_ERROR)) return err; @@ -757,7 +803,8 @@ gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, check_group_elem(msg2[6]) || check_group_elem(msg2[7]) || check_expon(msg2[2]) || check_expon(msg2[5]) || check_expon(msg2[9]) || check_expon(msg2[10])) { - return gcry_error(GPG_ERR_INV_VALUE); + otrl_sm_msg_free(&msg2, SM_MSG2_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } otrl_sm_msg3_init(&msg3); @@ -765,10 +812,12 @@ gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, /* Store Bob's g3a value for later in the protocol */ gcry_mpi_set(astate->g3o, msg2[3]); - /* Verify Bob's knowledge of discreet log proofs */ - if (otrl_sm_check_know_log(msg2[1], msg2[2], astate->g1, msg2[0], 3) || - otrl_sm_check_know_log(msg2[4], msg2[5], astate->g1, msg2[3], 4)) { - return gcry_error(GPG_ERR_INV_VALUE); + /* Verify Bob's knowledge of discrete log proofs */ + if (otrl_sm_check_know_log(msg2[1], msg2[2], astate->g1, msg2[0], 3) || + otrl_sm_check_know_log(msg2[4], msg2[5], astate->g1, msg2[3], 4)) { + otrl_sm_msg_free(&msg2, SM_MSG2_LEN); + otrl_sm_msg_free(&msg3, SM_MSG3_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } /* Combine the two halves from Bob and Alice and determine g2 and g3 */ @@ -776,8 +825,12 @@ gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, gcry_mpi_powm(astate->g3, msg2[3], astate->x3, SM_MODULUS); /* Verify Bob's coordinate equality proof */ - if (otrl_sm_check_equal_coords(msg2[8], msg2[9], msg2[10], msg2[6], msg2[7], astate, 5)) - return gcry_error(GPG_ERR_INV_VALUE); + if (otrl_sm_check_equal_coords(msg2[8], msg2[9], msg2[10], msg2[6], msg2[7], + astate, 5)) { + otrl_sm_msg_free(&msg2, SM_MSG2_LEN); + otrl_sm_msg_free(&msg3, SM_MSG3_LEN); + return gcry_error(GPG_ERR_INV_VALUE); + } /* Calculate P and Q values for Alice */ r = randomExponent(); @@ -790,7 +843,8 @@ gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, gcry_mpi_mulm(astate->q, qa1, qa2, SM_MODULUS); gcry_mpi_set(msg3[1], astate->q); - otrl_sm_proof_equal_coords(&(msg3[2]), &(msg3[3]), &(msg3[4]), astate, r, 6); + otrl_sm_proof_equal_coords(&(msg3[2]), &(msg3[3]), &(msg3[4]), astate, + r, 6); /* Calculate Ra and proof */ inv = gcry_mpi_new(SM_MOD_LEN_BITS); @@ -822,7 +876,8 @@ gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, * This method also checks if Alice and Bob's secrets were the same. If * so, it returns NO_ERROR. If the secrets differ, an INV_VALUE error is * returned instead. */ -gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen) +gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, + const int inputlen, unsigned char **output, int* outputlen) { /* Read from input to find the mpis */ int comp; @@ -835,7 +890,7 @@ gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, c *output = NULL; *outputlen = 0; bstate->sm_prog_state = OTRL_SMP_PROG_CHEATED; - + if (err != gcry_error(GPG_ERR_NO_ERROR)) return err; otrl_sm_msg4_init(&msg4); @@ -843,12 +898,18 @@ gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, c if (check_group_elem(msg3[0]) || check_group_elem(msg3[1]) || check_group_elem(msg3[5]) || check_expon(msg3[3]) || check_expon(msg3[4]) || check_expon(msg3[7])) { - return gcry_error(GPG_ERR_INV_VALUE); + otrl_sm_msg_free(&msg3, SM_MSG3_LEN); + otrl_sm_msg_free(&msg4, SM_MSG4_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } /* Verify Alice's coordinate equality proof */ - if (otrl_sm_check_equal_coords(msg3[2], msg3[3], msg3[4], msg3[0], msg3[1], bstate, 6)) - return gcry_error(GPG_ERR_INV_VALUE); + if (otrl_sm_check_equal_coords(msg3[2], msg3[3], msg3[4], msg3[0], msg3[1], + bstate, 6)) { + otrl_sm_msg_free(&msg3, SM_MSG3_LEN); + otrl_sm_msg_free(&msg4, SM_MSG4_LEN); + return gcry_error(GPG_ERR_INV_VALUE); + } /* Find Pa/Pb and Qa/Qb */ inv = gcry_mpi_new(SM_MOD_LEN_BITS); @@ -858,8 +919,12 @@ gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, c gcry_mpi_mulm(bstate->qab, msg3[1], inv, SM_MODULUS); /* Verify Alice's log equality proof */ - if (otrl_sm_check_equal_logs(msg3[6], msg3[7], msg3[5], bstate, 7)) - return gcry_error(GPG_ERR_INV_VALUE); + if (otrl_sm_check_equal_logs(msg3[6], msg3[7], msg3[5], bstate, 7)) { + otrl_sm_msg_free(&msg3, SM_MSG3_LEN); + otrl_sm_msg_free(&msg4, SM_MSG4_LEN); + gcry_mpi_release(inv); + return gcry_error(GPG_ERR_INV_VALUE); + } /* Calculate Rb and proof */ gcry_mpi_powm(msg4[0], bstate->qab, bstate->x3, SM_MODULUS); @@ -882,16 +947,17 @@ gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, c OTRL_SMP_PROG_SUCCEEDED; if (comp) - return gcry_error(GPG_ERR_INV_VALUE); + return gcry_error(GPG_ERR_INV_VALUE); else - return gcry_error(GPG_ERR_NO_ERROR); + return gcry_error(GPG_ERR_NO_ERROR); } /* Receives the final SMP message, which was generated in otrl_sm_step. * This method checks if Alice and Bob's secrets were the same. If * so, it returns NO_ERROR. If the secrets differ, an INV_VALUE error is * returned instead. */ -gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen) +gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, + const int inputlen) { /* Read from input to find the mpis */ int comp; @@ -900,16 +966,19 @@ gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, gcry_error_t err; err = unserialize_mpi_array(&msg4, SM_MSG4_LEN, input, inputlen); astate->sm_prog_state = OTRL_SMP_PROG_CHEATED; - + if (err != gcry_error(GPG_ERR_NO_ERROR)) return err; if (check_group_elem(msg4[0]) || check_expon(msg4[2])) { - return gcry_error(GPG_ERR_INV_VALUE); + otrl_sm_msg_free(&msg4, SM_MSG4_LEN); + return gcry_error(GPG_ERR_INV_VALUE); } /* Verify Bob's log equality proof */ - if (otrl_sm_check_equal_logs(msg4[1], msg4[2], msg4[0], astate, 8)) - return gcry_error(GPG_ERR_INV_VALUE); + if (otrl_sm_check_equal_logs(msg4[1], msg4[2], msg4[0], astate, 8)) { + otrl_sm_msg_free(&msg4, SM_MSG4_LEN); + return gcry_error(GPG_ERR_INV_VALUE); + } /* Calculate Rab and verify that secrets match */ rab = gcry_mpi_new(SM_MOD_LEN_BITS); @@ -923,7 +992,7 @@ gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, OTRL_SMP_PROG_SUCCEEDED; if (comp) - return gcry_error(GPG_ERR_INV_VALUE); + return gcry_error(GPG_ERR_INV_VALUE); else - return gcry_error(GPG_ERR_NO_ERROR); + return gcry_error(GPG_ERR_NO_ERROR); } diff --git a/plugins/MirOTR/libotr/src/sm.h b/plugins/MirOTR/libotr/src/sm.h index 2e94f07e64..53703ff301 100644 --- a/plugins/MirOTR/libotr/src/sm.h +++ b/plugins/MirOTR/libotr/src/sm.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __SM_H__ diff --git a/plugins/MirOTR/libotr/src/tests.c b/plugins/MirOTR/libotr/src/tests.c new file mode 100644 index 0000000000..d64ac354a1 --- /dev/null +++ b/plugins/MirOTR/libotr/src/tests.c @@ -0,0 +1,275 @@ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "proto.h" +#include "privkey.h" +#include "message.h" +#include "instag.h" + +#define ALICE "alice" +#define BOB "bob" +#define PROTO "prpl-oscar" + +static OtrlPolicy ALICEPOLICY = OTRL_POLICY_DEFAULT &~ OTRL_POLICY_ALLOW_V1; +static OtrlPolicy BOBPOLICY = OTRL_POLICY_DEFAULT; +void receiving(const char *from, const char *to, const char *msg); + +typedef struct s_node { + struct s_node *next; + char *from, *to, *msg; +} MsgNode; + +static MsgNode *noderoot = NULL; +static MsgNode **nodeend = &noderoot; + +void otrl_sm_init(void) {} +void otrl_sm_state_new(OtrlSMState *smst) {} +void otrl_sm_state_init(OtrlSMState *smst) {} +void otrl_sm_state_free(OtrlSMState *smst) {} +gcry_error_t otrl_sm_step1(OtrlSMAliceState *astate, const unsigned char* secret, int secretlen, unsigned char** output, int* outputlen) {return gcry_error(GPG_ERR_NO_ERROR);} +gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, int received_question) {return gcry_error(GPG_ERR_NO_ERROR);} +gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, int secretlen, unsigned char **output, int* outputlen) {return gcry_error(GPG_ERR_NO_ERROR);} +gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen) {return gcry_error(GPG_ERR_NO_ERROR);} +gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen) {return gcry_error(GPG_ERR_NO_ERROR);} +gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen) {return gcry_error(GPG_ERR_NO_ERROR);} + + +static void dispatch(void) +{ + while(noderoot) { + MsgNode *node = noderoot; + + receiving(node->from, node->to, node->msg); + free(node->from); + free(node->to); + free(node->msg); + noderoot = node->next; + free(node); + if (noderoot == NULL) nodeend = &noderoot; + } +} + +static void inject(const char *from, const char *to, const char *msg) +{ + MsgNode *node = malloc(sizeof(*node)); + node->from = strdup(from); + node->to = strdup(to); + node->msg = strdup(msg); + node->next = NULL; + *nodeend = node; + nodeend = &(node->next); + printf("[%s->%s: %s]\n\n", from, to, msg); +} + +static OtrlPolicy op_policy(void *opdata, ConnContext *context) +{ + if (!strcmp(context->accountname, ALICE)) return ALICEPOLICY; + if (!strcmp(context->accountname, BOB)) return BOBPOLICY; + return OTRL_POLICY_DEFAULT; +} + +static void op_inject(void *opdata, const char *accountname, + const char *protocol, const char *recipient, const char *message) +{ + inject(accountname, recipient, message); +} + +static void op_notify(void *opdata, OtrlNotifyLevel level, + const char *accountname, const char *protocol, + const char *username, const char *title, + const char *primary, const char *secondary) +{ +} + +static int op_display_otr_message(void *opdata, const char *accountname, + const char *protocol, const char *username, const char *msg) +{ + return -1; +} + +static void op_gone_secure(void *opdata, ConnContext *context) +{ + printf("SECURE (%d): %s / %s\n\n", context->protocol_version, + context->accountname, context->username); +} + +static void op_gone_insecure(void *opdata, ConnContext *context) +{ + printf("INSECURE: %s / %s\n\n", context->accountname, context->username); +} + +static void op_still_secure(void *opdata, ConnContext *context, int is_reply) +{ + printf("REFRESH (%d/%d): %s / %s\n\n", is_reply, context->protocol_version, + context->accountname, context->username); +} + +static OtrlMessageAppOps ops = { + op_policy, + NULL, + NULL, + op_inject, + op_notify, + op_display_otr_message, + NULL, + NULL, + NULL, + NULL, + NULL, + op_gone_secure, + op_gone_insecure, + op_still_secure, + NULL +}; + +static OtrlUserState us; + +void receiving(const char *from, const char *to, const char *msg) +{ + int ignore; + char *newmsg; + OtrlTLV *tlvs; + + ignore = otrl_message_receiving(us, &ops, NULL, to, PROTO, from, msg, + &newmsg, &tlvs, NULL, NULL); + + if (!ignore) { + printf("%s> %s\n\n", from, newmsg ? newmsg : msg); + } + + otrl_message_free(newmsg); + otrl_tlv_free(tlvs); +} + +static void sending(const char *from, const char *to, const char *msg) +{ + gcry_error_t err; + OtrlTLV *tlvs = NULL; + char *newmsg; + + err = otrl_message_sending(us, &ops, NULL, from, PROTO, to, msg, + tlvs, &newmsg, NULL, NULL, NULL); + + if (!err) { + inject(from, to, newmsg ? newmsg : msg); + } + + otrl_message_free(newmsg); + otrl_tlv_free(tlvs); +} + +static void test(int vers, int both) +{ + printf("\n\n*** Testing version %d, %s ***\n\n", vers, + both ? "simultaneous start" : "Alice start"); + + otrl_context_forget_all(us); + if (vers == 1) + ALICEPOLICY = OTRL_POLICY_ALLOW_V1; + else if (vers == 2) + ALICEPOLICY = OTRL_POLICY_ALLOW_V2; + else + ALICEPOLICY = OTRL_POLICY_DEFAULT; + sending(ALICE, BOB, "?OTR?"); + if (both) { + sending(BOB, ALICE, "?OTR?"); + } + dispatch(); + sending(ALICE, BOB, "Hi there"); + dispatch(); +} + +void test_unreadable(void) +{ + ConnContext *bobcontext; + + printf("\n\n*** Testing Bob receiving unreadable messages from " + "Alice ***\n\n"); + + bobcontext = otrl_context_find(us, ALICE, BOB, PROTO, 0, 0, NULL, NULL, NULL); + otrl_context_force_plaintext(bobcontext); + sending(ALICE, BOB, "unreadable text"); + dispatch(); + +} + +void test_crash1(void) +{ + ConnContext *alicecontext, *bobcontext; + + printf("\n\n*** Testing old double gcry_cipher_release case ***\n\n"); + + otrl_context_forget_all(us); + ALICEPOLICY = OTRL_POLICY_DEFAULT; + sending(ALICE, BOB, "?OTR?"); + dispatch(); + + alicecontext = otrl_context_find(us, BOB, ALICE, PROTO, 0, 0, NULL, NULL, NULL); + bobcontext = otrl_context_find(us, ALICE, BOB, PROTO, 0, 0, NULL, NULL, NULL); + + sending(ALICE, BOB, "Hi!"); dispatch(); + sending(BOB, ALICE, "There!"); dispatch(); + sending(ALICE, BOB, "You!"); dispatch(); + otrl_context_force_plaintext(bobcontext); + sending(BOB, ALICE, "?OTR?"); dispatch(); + sending(ALICE, BOB, "now."); dispatch(); + printf("%d %p %p\n", alicecontext->our_keyid, alicecontext->their_y, alicecontext->their_old_y); + printf("%p %p %p %p\n", + alicecontext->sesskeys[0][0].sendenc, + alicecontext->sesskeys[0][1].sendenc, + alicecontext->sesskeys[1][0].sendenc, + alicecontext->sesskeys[1][1].sendenc); + sending(BOB, ALICE, "then."); dispatch(); +} + +void test_refresh(int vers) +{ + ConnContext *alicecontext, *bobcontext; + + printf("\n\n*** Testing refresh ***\n\n"); + + otrl_context_forget_all(us); + if (vers == 1) + ALICEPOLICY = OTRL_POLICY_ALLOW_V1; + else if (vers == 2) + ALICEPOLICY = OTRL_POLICY_ALLOW_V2; + else + ALICEPOLICY = OTRL_POLICY_DEFAULT; + sending(ALICE, BOB, "?OTR?"); dispatch(); + + alicecontext = otrl_context_find(us, BOB, ALICE, PROTO, 0, 0, NULL, NULL, NULL); + bobcontext = otrl_context_find(us, ALICE, BOB, PROTO, 0, 0, NULL, NULL, NULL); + printf("%p %p\n", alicecontext, bobcontext); + + sending(ALICE, BOB, "Hi!"); dispatch(); + sending(BOB, ALICE, "There!"); dispatch(); + sending(ALICE, BOB, "You!"); dispatch(); + sending(ALICE, BOB, "Guys!"); dispatch(); + sending(BOB, ALICE, "?OTR?"); dispatch(); + sending(ALICE, BOB, "Refreshed!"); dispatch(); + sending(BOB, ALICE, "Also refreshed!"); dispatch(); +} + +int main(int argc, char **argv) +{ + OTRL_INIT; + us = otrl_userstate_create(); + + otrl_privkey_read(us, "/home/iang/.gaim/otr.private_key"); + otrl_instag_read(us, "inst.txt"); + + test(1,0); + test(2,0); + test(3,0); + test(1,1); + test(2,1); + test_unreadable(); + test_crash1(); + test_refresh(3); + test_refresh(2); + test_refresh(1); + + otrl_userstate_free(us); + + return 0; +} diff --git a/plugins/MirOTR/libotr/src/tlv.c b/plugins/MirOTR/libotr/src/tlv.c index 0cea7b5fa2..fa76c3d76c 100644 --- a/plugins/MirOTR/libotr/src/tlv.c +++ b/plugins/MirOTR/libotr/src/tlv.c @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdlib.h> diff --git a/plugins/MirOTR/libotr/src/tlv.h b/plugins/MirOTR/libotr/src/tlv.h index affe0d58e1..0bfeeb27fd 100644 --- a/plugins/MirOTR/libotr/src/tlv.h +++ b/plugins/MirOTR/libotr/src/tlv.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __TLV_H__ @@ -35,7 +36,7 @@ typedef struct s_OtrlTLV { /* The sender has thrown away his OTR session keys with you */ #define OTRL_TLV_DISCONNECTED 0x0001 -/* The message contains a step in the Socialist Millionaires' Protocol. */ +/* The message contains a step in the Socialist Millionaires' Protocol. */ #define OTRL_TLV_SMP1 0x0002 #define OTRL_TLV_SMP2 0x0003 #define OTRL_TLV_SMP3 0x0004 @@ -44,6 +45,13 @@ typedef struct s_OtrlTLV { /* Like OTRL_TLV_SMP1, but there's a question for the buddy at the * beginning */ #define OTRL_TLV_SMP1Q 0x0007 +/* Tell the application the current "extra" symmetric key */ +/* XXX: Document this in the protocol spec: + * The body of the TLV will begin with a 4-byte indication of what this + * symmetric key will be used for (file transfer, voice encryption, + * etc.). After that, the contents are use-specific (which file, etc.). + * There are no currently defined uses. */ +#define OTRL_TLV_SYMKEY 0x0008 /* Make a single TLV, copying the supplied data */ OtrlTLV *otrl_tlv_new(unsigned short type, unsigned short len, diff --git a/plugins/MirOTR/libotr/src/userstate.c b/plugins/MirOTR/libotr/src/userstate.c index 6de95b8e42..58f5a05578 100644 --- a/plugins/MirOTR/libotr/src/userstate.c +++ b/plugins/MirOTR/libotr/src/userstate.c @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* system headers */ @@ -38,14 +39,19 @@ OtrlUserState otrl_userstate_create(void) if (!us) return NULL; us->context_root = NULL; us->privkey_root = NULL; - + us->instag_root = NULL; + us->pending_root = NULL; + us->timer_running = 0; return us; } -/* Free a OtrlUserState */ +/* Free a OtrlUserState. If you have a timer running for this userstate, +stop it before freeing the userstate. */ void otrl_userstate_free(OtrlUserState us) { otrl_context_forget_all(us); otrl_privkey_forget_all(us); + otrl_privkey_pending_forget_all(us); + otrl_instag_forget_all(us); free(us); } diff --git a/plugins/MirOTR/libotr/src/userstate.h b/plugins/MirOTR/libotr/src/userstate.h index 8525df0518..3f1e3b89cf 100644 --- a/plugins/MirOTR/libotr/src/userstate.h +++ b/plugins/MirOTR/libotr/src/userstate.h @@ -1,6 +1,7 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2012 Ian Goldberg, Rob Smits, Chris Alexander, + * Willy Lew, Lisa Du, Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,7 +15,7 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __USERSTATE_H__ @@ -22,12 +23,16 @@ typedef struct s_OtrlUserState* OtrlUserState; +#include "instag.h" #include "context.h" #include "privkey-t.h" struct s_OtrlUserState { ConnContext *context_root; OtrlPrivKey *privkey_root; + OtrlInsTag *instag_root; + OtrlPendingPrivKey *pending_root; + int timer_running; }; /* Create a new OtrlUserState. Most clients will only need one of @@ -39,7 +44,8 @@ struct s_OtrlUserState { * OtrlUserState. */ OtrlUserState otrl_userstate_create(void); -/* Free a OtrlUserState */ +/* Free a OtrlUserState. If you have a timer running for this userstate, +stop it before freeing the userstate. */ void otrl_userstate_free(OtrlUserState us); #endif diff --git a/plugins/MirOTR/libotr/src/version.h b/plugins/MirOTR/libotr/src/version.h index 11cb586699..ae2f7ff3dd 100644 --- a/plugins/MirOTR/libotr/src/version.h +++ b/plugins/MirOTR/libotr/src/version.h @@ -1,6 +1,8 @@ /* * Off-the-Record Messaging library - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov + * Copyright (C) 2004-2014 Ian Goldberg, David Goulet, Rob Smits, + * Chris Alexander, Willy Lew, Lisa Du, + * Nikita Borisov * <otr@cypherpunks.ca> * * This library is free software; you can redistribute it and/or @@ -14,16 +16,16 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __VERSION_H__ #define __VERSION_H__ -#define OTRL_VERSION "3.2.0" +#define OTRL_VERSION "4.1.0" -#define OTRL_VERSION_MAJOR 3 -#define OTRL_VERSION_MINOR 2 +#define OTRL_VERSION_MAJOR 4 +#define OTRL_VERSION_MINOR 1 #define OTRL_VERSION_SUB 0 #endif |