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Diffstat (limited to 'libs/libcurl/src/curl_ntlm_wb.c')
-rw-r--r--libs/libcurl/src/curl_ntlm_wb.c1000
1 files changed, 500 insertions, 500 deletions
diff --git a/libs/libcurl/src/curl_ntlm_wb.c b/libs/libcurl/src/curl_ntlm_wb.c
index 33dcf0ce25..510b311a7e 100644
--- a/libs/libcurl/src/curl_ntlm_wb.c
+++ b/libs/libcurl/src/curl_ntlm_wb.c
@@ -1,500 +1,500 @@
-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- * SPDX-License-Identifier: curl
- *
- ***************************************************************************/
-
-#include "curl_setup.h"
-
-#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM) && \
- defined(NTLM_WB_ENABLED)
-
-/*
- * NTLM details:
- *
- * https://davenport.sourceforge.net/ntlm.html
- * https://www.innovation.ch/java/ntlm.html
- */
-
-#define DEBUG_ME 0
-
-#ifdef HAVE_SYS_WAIT_H
-#include <sys/wait.h>
-#endif
-#ifdef HAVE_SIGNAL_H
-#include <signal.h>
-#endif
-#ifdef HAVE_PWD_H
-#include <pwd.h>
-#endif
-
-#include "urldata.h"
-#include "sendf.h"
-#include "select.h"
-#include "vauth/ntlm.h"
-#include "curl_ntlm_core.h"
-#include "curl_ntlm_wb.h"
-#include "url.h"
-#include "strerror.h"
-#include "strdup.h"
-#include "strcase.h"
-
-/* The last 3 #include files should be in this order */
-#include "curl_printf.h"
-#include "curl_memory.h"
-#include "memdebug.h"
-
-#if DEBUG_ME
-# define DEBUG_OUT(x) x
-#else
-# define DEBUG_OUT(x) Curl_nop_stmt
-#endif
-
-/* Portable 'sclose_nolog' used only in child process instead of 'sclose'
- to avoid fooling the socket leak detector */
-#if defined(HAVE_CLOSESOCKET)
-# define sclose_nolog(x) closesocket((x))
-#elif defined(HAVE_CLOSESOCKET_CAMEL)
-# define sclose_nolog(x) CloseSocket((x))
-#else
-# define sclose_nolog(x) close((x))
-#endif
-
-static void ntlm_wb_cleanup(struct ntlmdata *ntlm)
-{
- if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
- sclose(ntlm->ntlm_auth_hlpr_socket);
- ntlm->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
- }
-
- if(ntlm->ntlm_auth_hlpr_pid) {
- int i;
- for(i = 0; i < 4; i++) {
- pid_t ret = waitpid(ntlm->ntlm_auth_hlpr_pid, NULL, WNOHANG);
- if(ret == ntlm->ntlm_auth_hlpr_pid || errno == ECHILD)
- break;
- switch(i) {
- case 0:
- kill(ntlm->ntlm_auth_hlpr_pid, SIGTERM);
- break;
- case 1:
- /* Give the process another moment to shut down cleanly before
- bringing down the axe */
- Curl_wait_ms(1);
- break;
- case 2:
- kill(ntlm->ntlm_auth_hlpr_pid, SIGKILL);
- break;
- case 3:
- break;
- }
- }
- ntlm->ntlm_auth_hlpr_pid = 0;
- }
-
- Curl_safefree(ntlm->challenge);
- Curl_safefree(ntlm->response);
-}
-
-static CURLcode ntlm_wb_init(struct Curl_easy *data, struct ntlmdata *ntlm,
- const char *userp)
-{
- curl_socket_t sockfds[2];
- pid_t child_pid;
- const char *username;
- char *slash, *domain = NULL;
- const char *ntlm_auth = NULL;
- char *ntlm_auth_alloc = NULL;
-#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
- struct passwd pw, *pw_res;
- char pwbuf[1024];
-#endif
- char buffer[STRERROR_LEN];
-
-#if defined(CURL_DISABLE_VERBOSE_STRINGS)
- (void) data;
-#endif
-
- /* Return if communication with ntlm_auth already set up */
- if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
- ntlm->ntlm_auth_hlpr_pid)
- return CURLE_OK;
-
- username = userp;
- /* The real ntlm_auth really doesn't like being invoked with an
- empty username. It won't make inferences for itself, and expects
- the client to do so (mostly because it's really designed for
- servers like squid to use for auth, and client support is an
- afterthought for it). So try hard to provide a suitable username
- if we don't already have one. But if we can't, provide the
- empty one anyway. Perhaps they have an implementation of the
- ntlm_auth helper which *doesn't* need it so we might as well try */
- if(!username || !username[0]) {
- username = getenv("NTLMUSER");
- if(!username || !username[0])
- username = getenv("LOGNAME");
- if(!username || !username[0])
- username = getenv("USER");
-#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
- if((!username || !username[0]) &&
- !getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res) &&
- pw_res) {
- username = pw.pw_name;
- }
-#endif
- if(!username || !username[0])
- username = userp;
- }
- slash = strpbrk(username, "\\/");
- if(slash) {
- domain = strdup(username);
- if(!domain)
- return CURLE_OUT_OF_MEMORY;
- slash = domain + (slash - username);
- *slash = '\0';
- username = username + (slash - domain) + 1;
- }
-
- /* For testing purposes, when DEBUGBUILD is defined and environment
- variable CURL_NTLM_WB_FILE is set a fake_ntlm is used to perform
- NTLM challenge/response which only accepts commands and output
- strings pre-written in test case definitions */
-#ifdef DEBUGBUILD
- ntlm_auth_alloc = curl_getenv("CURL_NTLM_WB_FILE");
- if(ntlm_auth_alloc)
- ntlm_auth = ntlm_auth_alloc;
- else
-#endif
- ntlm_auth = NTLM_WB_FILE;
-
- if(access(ntlm_auth, X_OK) != 0) {
- failf(data, "Could not access ntlm_auth: %s errno %d: %s",
- ntlm_auth, errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- goto done;
- }
-
- if(Curl_socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
- failf(data, "Could not open socket pair. errno %d: %s",
- errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- goto done;
- }
-
- child_pid = fork();
- if(child_pid == -1) {
- sclose(sockfds[0]);
- sclose(sockfds[1]);
- failf(data, "Could not fork. errno %d: %s",
- errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- goto done;
- }
- else if(!child_pid) {
- /*
- * child process
- */
-
- /* Don't use sclose in the child since it fools the socket leak detector */
- sclose_nolog(sockfds[0]);
- if(dup2(sockfds[1], STDIN_FILENO) == -1) {
- failf(data, "Could not redirect child stdin. errno %d: %s",
- errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- exit(1);
- }
-
- if(dup2(sockfds[1], STDOUT_FILENO) == -1) {
- failf(data, "Could not redirect child stdout. errno %d: %s",
- errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- exit(1);
- }
-
- if(domain)
- execl(ntlm_auth, ntlm_auth,
- "--helper-protocol", "ntlmssp-client-1",
- "--use-cached-creds",
- "--username", username,
- "--domain", domain,
- NULL);
- else
- execl(ntlm_auth, ntlm_auth,
- "--helper-protocol", "ntlmssp-client-1",
- "--use-cached-creds",
- "--username", username,
- NULL);
-
- sclose_nolog(sockfds[1]);
- failf(data, "Could not execl(). errno %d: %s",
- errno, Curl_strerror(errno, buffer, sizeof(buffer)));
- exit(1);
- }
-
- sclose(sockfds[1]);
- ntlm->ntlm_auth_hlpr_socket = sockfds[0];
- ntlm->ntlm_auth_hlpr_pid = child_pid;
- free(domain);
- free(ntlm_auth_alloc);
- return CURLE_OK;
-
-done:
- free(domain);
- free(ntlm_auth_alloc);
- return CURLE_REMOTE_ACCESS_DENIED;
-}
-
-/* if larger than this, something is seriously wrong */
-#define MAX_NTLM_WB_RESPONSE 100000
-
-static CURLcode ntlm_wb_response(struct Curl_easy *data, struct ntlmdata *ntlm,
- const char *input, curlntlm state)
-{
- size_t len_in = strlen(input), len_out = 0;
- struct dynbuf b;
- char *ptr = NULL;
- unsigned char *buf = (unsigned char *)data->state.buffer;
- Curl_dyn_init(&b, MAX_NTLM_WB_RESPONSE);
-
- while(len_in > 0) {
- ssize_t written = swrite(ntlm->ntlm_auth_hlpr_socket, input, len_in);
- if(written == -1) {
- /* Interrupted by a signal, retry it */
- if(errno == EINTR)
- continue;
- /* write failed if other errors happen */
- goto done;
- }
- input += written;
- len_in -= written;
- }
- /* Read one line */
- while(1) {
- ssize_t size =
- sread(ntlm->ntlm_auth_hlpr_socket, buf, data->set.buffer_size);
- if(size == -1) {
- if(errno == EINTR)
- continue;
- goto done;
- }
- else if(size == 0)
- goto done;
-
- if(Curl_dyn_addn(&b, buf, size))
- goto done;
-
- len_out = Curl_dyn_len(&b);
- ptr = Curl_dyn_ptr(&b);
- if(len_out && ptr[len_out - 1] == '\n') {
- ptr[len_out - 1] = '\0';
- break; /* done! */
- }
- /* loop */
- }
-
- /* Samba/winbind installed but not configured */
- if(state == NTLMSTATE_TYPE1 &&
- len_out == 3 &&
- ptr[0] == 'P' && ptr[1] == 'W')
- goto done;
- /* invalid response */
- if(len_out < 4)
- goto done;
- if(state == NTLMSTATE_TYPE1 &&
- (ptr[0]!='Y' || ptr[1]!='R' || ptr[2]!=' '))
- goto done;
- if(state == NTLMSTATE_TYPE2 &&
- (ptr[0]!='K' || ptr[1]!='K' || ptr[2]!=' ') &&
- (ptr[0]!='A' || ptr[1]!='F' || ptr[2]!=' '))
- goto done;
-
- ntlm->response = strdup(ptr + 3);
- Curl_dyn_free(&b);
- if(!ntlm->response)
- return CURLE_OUT_OF_MEMORY;
- return CURLE_OK;
-done:
- Curl_dyn_free(&b);
- return CURLE_REMOTE_ACCESS_DENIED;
-}
-
-CURLcode Curl_input_ntlm_wb(struct Curl_easy *data,
- struct connectdata *conn,
- bool proxy,
- const char *header)
-{
- struct ntlmdata *ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
- curlntlm *state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
-
- (void) data; /* In case it gets unused by nop log macros. */
-
- if(!checkprefix("NTLM", header))
- return CURLE_BAD_CONTENT_ENCODING;
-
- header += strlen("NTLM");
- while(*header && ISSPACE(*header))
- header++;
-
- if(*header) {
- ntlm->challenge = strdup(header);
- if(!ntlm->challenge)
- return CURLE_OUT_OF_MEMORY;
-
- *state = NTLMSTATE_TYPE2; /* We got a type-2 message */
- }
- else {
- if(*state == NTLMSTATE_LAST) {
- infof(data, "NTLM auth restarted");
- Curl_http_auth_cleanup_ntlm_wb(conn);
- }
- else if(*state == NTLMSTATE_TYPE3) {
- infof(data, "NTLM handshake rejected");
- Curl_http_auth_cleanup_ntlm_wb(conn);
- *state = NTLMSTATE_NONE;
- return CURLE_REMOTE_ACCESS_DENIED;
- }
- else if(*state >= NTLMSTATE_TYPE1) {
- infof(data, "NTLM handshake failure (internal error)");
- return CURLE_REMOTE_ACCESS_DENIED;
- }
-
- *state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
- }
-
- return CURLE_OK;
-}
-
-/*
- * This is for creating ntlm header output by delegating challenge/response
- * to Samba's winbind daemon helper ntlm_auth.
- */
-CURLcode Curl_output_ntlm_wb(struct Curl_easy *data, struct connectdata *conn,
- bool proxy)
-{
- /* point to the address of the pointer that holds the string to send to the
- server, which is for a plain host or for a HTTP proxy */
- char **allocuserpwd;
- /* point to the name and password for this */
- const char *userp;
- struct ntlmdata *ntlm;
- curlntlm *state;
- struct auth *authp;
-
- CURLcode res = CURLE_OK;
-
- DEBUGASSERT(conn);
- DEBUGASSERT(data);
-
- if(proxy) {
-#ifndef CURL_DISABLE_PROXY
- allocuserpwd = &data->state.aptr.proxyuserpwd;
- userp = conn->http_proxy.user;
- ntlm = &conn->proxyntlm;
- state = &conn->proxy_ntlm_state;
- authp = &data->state.authproxy;
-#else
- return CURLE_NOT_BUILT_IN;
-#endif
- }
- else {
- allocuserpwd = &data->state.aptr.userpwd;
- userp = conn->user;
- ntlm = &conn->ntlm;
- state = &conn->http_ntlm_state;
- authp = &data->state.authhost;
- }
- authp->done = FALSE;
-
- /* not set means empty */
- if(!userp)
- userp = "";
-
- switch(*state) {
- case NTLMSTATE_TYPE1:
- default:
- /* Use Samba's 'winbind' daemon to support NTLM authentication,
- * by delegating the NTLM challenge/response protocol to a helper
- * in ntlm_auth.
- * https://web.archive.org/web/20190925164737
- * /devel.squid-cache.org/ntlm/squid_helper_protocol.html
- * https://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
- * https://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
- * Preprocessor symbol 'NTLM_WB_ENABLED' is defined when this
- * feature is enabled and 'NTLM_WB_FILE' symbol holds absolute
- * filename of ntlm_auth helper.
- * If NTLM authentication using winbind fails, go back to original
- * request handling process.
- */
- /* Create communication with ntlm_auth */
- res = ntlm_wb_init(data, ntlm, userp);
- if(res)
- return res;
- res = ntlm_wb_response(data, ntlm, "YR\n", *state);
- if(res)
- return res;
-
- free(*allocuserpwd);
- *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
- proxy ? "Proxy-" : "",
- ntlm->response);
- DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
- Curl_safefree(ntlm->response);
- if(!*allocuserpwd)
- return CURLE_OUT_OF_MEMORY;
- break;
-
- case NTLMSTATE_TYPE2: {
- char *input = aprintf("TT %s\n", ntlm->challenge);
- if(!input)
- return CURLE_OUT_OF_MEMORY;
- res = ntlm_wb_response(data, ntlm, input, *state);
- free(input);
- if(res)
- return res;
-
- free(*allocuserpwd);
- *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
- proxy ? "Proxy-" : "",
- ntlm->response);
- DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
- *state = NTLMSTATE_TYPE3; /* we sent a type-3 */
- authp->done = TRUE;
- Curl_http_auth_cleanup_ntlm_wb(conn);
- if(!*allocuserpwd)
- return CURLE_OUT_OF_MEMORY;
- break;
- }
- case NTLMSTATE_TYPE3:
- /* connection is already authenticated,
- * don't send a header in future requests */
- *state = NTLMSTATE_LAST;
- /* FALLTHROUGH */
- case NTLMSTATE_LAST:
- Curl_safefree(*allocuserpwd);
- authp->done = TRUE;
- break;
- }
-
- return CURLE_OK;
-}
-
-void Curl_http_auth_cleanup_ntlm_wb(struct connectdata *conn)
-{
- ntlm_wb_cleanup(&conn->ntlm);
- ntlm_wb_cleanup(&conn->proxyntlm);
-}
-
-#endif /* !CURL_DISABLE_HTTP && USE_NTLM && NTLM_WB_ENABLED */
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM) && \
+ defined(NTLM_WB_ENABLED)
+
+/*
+ * NTLM details:
+ *
+ * https://davenport.sourceforge.net/ntlm.html
+ * https://www.innovation.ch/java/ntlm.html
+ */
+
+#define DEBUG_ME 0
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#endif
+
+#include "urldata.h"
+#include "sendf.h"
+#include "select.h"
+#include "vauth/ntlm.h"
+#include "curl_ntlm_core.h"
+#include "curl_ntlm_wb.h"
+#include "url.h"
+#include "strerror.h"
+#include "strdup.h"
+#include "strcase.h"
+
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+#if DEBUG_ME
+# define DEBUG_OUT(x) x
+#else
+# define DEBUG_OUT(x) Curl_nop_stmt
+#endif
+
+/* Portable 'sclose_nolog' used only in child process instead of 'sclose'
+ to avoid fooling the socket leak detector */
+#if defined(HAVE_CLOSESOCKET)
+# define sclose_nolog(x) closesocket((x))
+#elif defined(HAVE_CLOSESOCKET_CAMEL)
+# define sclose_nolog(x) CloseSocket((x))
+#else
+# define sclose_nolog(x) close((x))
+#endif
+
+static void ntlm_wb_cleanup(struct ntlmdata *ntlm)
+{
+ if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
+ sclose(ntlm->ntlm_auth_hlpr_socket);
+ ntlm->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
+ }
+
+ if(ntlm->ntlm_auth_hlpr_pid) {
+ int i;
+ for(i = 0; i < 4; i++) {
+ pid_t ret = waitpid(ntlm->ntlm_auth_hlpr_pid, NULL, WNOHANG);
+ if(ret == ntlm->ntlm_auth_hlpr_pid || errno == ECHILD)
+ break;
+ switch(i) {
+ case 0:
+ kill(ntlm->ntlm_auth_hlpr_pid, SIGTERM);
+ break;
+ case 1:
+ /* Give the process another moment to shut down cleanly before
+ bringing down the axe */
+ Curl_wait_ms(1);
+ break;
+ case 2:
+ kill(ntlm->ntlm_auth_hlpr_pid, SIGKILL);
+ break;
+ case 3:
+ break;
+ }
+ }
+ ntlm->ntlm_auth_hlpr_pid = 0;
+ }
+
+ Curl_safefree(ntlm->challenge);
+ Curl_safefree(ntlm->response);
+}
+
+static CURLcode ntlm_wb_init(struct Curl_easy *data, struct ntlmdata *ntlm,
+ const char *userp)
+{
+ curl_socket_t sockfds[2];
+ pid_t child_pid;
+ const char *username;
+ char *slash, *domain = NULL;
+ const char *ntlm_auth = NULL;
+ char *ntlm_auth_alloc = NULL;
+#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
+ struct passwd pw, *pw_res;
+ char pwbuf[1024];
+#endif
+ char buffer[STRERROR_LEN];
+
+#if defined(CURL_DISABLE_VERBOSE_STRINGS)
+ (void) data;
+#endif
+
+ /* Return if communication with ntlm_auth already set up */
+ if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
+ ntlm->ntlm_auth_hlpr_pid)
+ return CURLE_OK;
+
+ username = userp;
+ /* The real ntlm_auth really doesn't like being invoked with an
+ empty username. It won't make inferences for itself, and expects
+ the client to do so (mostly because it's really designed for
+ servers like squid to use for auth, and client support is an
+ afterthought for it). So try hard to provide a suitable username
+ if we don't already have one. But if we can't, provide the
+ empty one anyway. Perhaps they have an implementation of the
+ ntlm_auth helper which *doesn't* need it so we might as well try */
+ if(!username || !username[0]) {
+ username = getenv("NTLMUSER");
+ if(!username || !username[0])
+ username = getenv("LOGNAME");
+ if(!username || !username[0])
+ username = getenv("USER");
+#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
+ if((!username || !username[0]) &&
+ !getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res) &&
+ pw_res) {
+ username = pw.pw_name;
+ }
+#endif
+ if(!username || !username[0])
+ username = userp;
+ }
+ slash = strpbrk(username, "\\/");
+ if(slash) {
+ domain = strdup(username);
+ if(!domain)
+ return CURLE_OUT_OF_MEMORY;
+ slash = domain + (slash - username);
+ *slash = '\0';
+ username = username + (slash - domain) + 1;
+ }
+
+ /* For testing purposes, when DEBUGBUILD is defined and environment
+ variable CURL_NTLM_WB_FILE is set a fake_ntlm is used to perform
+ NTLM challenge/response which only accepts commands and output
+ strings pre-written in test case definitions */
+#ifdef DEBUGBUILD
+ ntlm_auth_alloc = curl_getenv("CURL_NTLM_WB_FILE");
+ if(ntlm_auth_alloc)
+ ntlm_auth = ntlm_auth_alloc;
+ else
+#endif
+ ntlm_auth = NTLM_WB_FILE;
+
+ if(access(ntlm_auth, X_OK) != 0) {
+ failf(data, "Could not access ntlm_auth: %s errno %d: %s",
+ ntlm_auth, errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ goto done;
+ }
+
+ if(Curl_socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
+ failf(data, "Could not open socket pair. errno %d: %s",
+ errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ goto done;
+ }
+
+ child_pid = fork();
+ if(child_pid == -1) {
+ sclose(sockfds[0]);
+ sclose(sockfds[1]);
+ failf(data, "Could not fork. errno %d: %s",
+ errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ goto done;
+ }
+ else if(!child_pid) {
+ /*
+ * child process
+ */
+
+ /* Don't use sclose in the child since it fools the socket leak detector */
+ sclose_nolog(sockfds[0]);
+ if(dup2(sockfds[1], STDIN_FILENO) == -1) {
+ failf(data, "Could not redirect child stdin. errno %d: %s",
+ errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ exit(1);
+ }
+
+ if(dup2(sockfds[1], STDOUT_FILENO) == -1) {
+ failf(data, "Could not redirect child stdout. errno %d: %s",
+ errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ exit(1);
+ }
+
+ if(domain)
+ execl(ntlm_auth, ntlm_auth,
+ "--helper-protocol", "ntlmssp-client-1",
+ "--use-cached-creds",
+ "--username", username,
+ "--domain", domain,
+ NULL);
+ else
+ execl(ntlm_auth, ntlm_auth,
+ "--helper-protocol", "ntlmssp-client-1",
+ "--use-cached-creds",
+ "--username", username,
+ NULL);
+
+ sclose_nolog(sockfds[1]);
+ failf(data, "Could not execl(). errno %d: %s",
+ errno, Curl_strerror(errno, buffer, sizeof(buffer)));
+ exit(1);
+ }
+
+ sclose(sockfds[1]);
+ ntlm->ntlm_auth_hlpr_socket = sockfds[0];
+ ntlm->ntlm_auth_hlpr_pid = child_pid;
+ free(domain);
+ free(ntlm_auth_alloc);
+ return CURLE_OK;
+
+done:
+ free(domain);
+ free(ntlm_auth_alloc);
+ return CURLE_REMOTE_ACCESS_DENIED;
+}
+
+/* if larger than this, something is seriously wrong */
+#define MAX_NTLM_WB_RESPONSE 100000
+
+static CURLcode ntlm_wb_response(struct Curl_easy *data, struct ntlmdata *ntlm,
+ const char *input, curlntlm state)
+{
+ size_t len_in = strlen(input), len_out = 0;
+ struct dynbuf b;
+ char *ptr = NULL;
+ unsigned char *buf = (unsigned char *)data->state.buffer;
+ Curl_dyn_init(&b, MAX_NTLM_WB_RESPONSE);
+
+ while(len_in > 0) {
+ ssize_t written = swrite(ntlm->ntlm_auth_hlpr_socket, input, len_in);
+ if(written == -1) {
+ /* Interrupted by a signal, retry it */
+ if(errno == EINTR)
+ continue;
+ /* write failed if other errors happen */
+ goto done;
+ }
+ input += written;
+ len_in -= written;
+ }
+ /* Read one line */
+ while(1) {
+ ssize_t size =
+ sread(ntlm->ntlm_auth_hlpr_socket, buf, data->set.buffer_size);
+ if(size == -1) {
+ if(errno == EINTR)
+ continue;
+ goto done;
+ }
+ else if(size == 0)
+ goto done;
+
+ if(Curl_dyn_addn(&b, buf, size))
+ goto done;
+
+ len_out = Curl_dyn_len(&b);
+ ptr = Curl_dyn_ptr(&b);
+ if(len_out && ptr[len_out - 1] == '\n') {
+ ptr[len_out - 1] = '\0';
+ break; /* done! */
+ }
+ /* loop */
+ }
+
+ /* Samba/winbind installed but not configured */
+ if(state == NTLMSTATE_TYPE1 &&
+ len_out == 3 &&
+ ptr[0] == 'P' && ptr[1] == 'W')
+ goto done;
+ /* invalid response */
+ if(len_out < 4)
+ goto done;
+ if(state == NTLMSTATE_TYPE1 &&
+ (ptr[0]!='Y' || ptr[1]!='R' || ptr[2]!=' '))
+ goto done;
+ if(state == NTLMSTATE_TYPE2 &&
+ (ptr[0]!='K' || ptr[1]!='K' || ptr[2]!=' ') &&
+ (ptr[0]!='A' || ptr[1]!='F' || ptr[2]!=' '))
+ goto done;
+
+ ntlm->response = strdup(ptr + 3);
+ Curl_dyn_free(&b);
+ if(!ntlm->response)
+ return CURLE_OUT_OF_MEMORY;
+ return CURLE_OK;
+done:
+ Curl_dyn_free(&b);
+ return CURLE_REMOTE_ACCESS_DENIED;
+}
+
+CURLcode Curl_input_ntlm_wb(struct Curl_easy *data,
+ struct connectdata *conn,
+ bool proxy,
+ const char *header)
+{
+ struct ntlmdata *ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
+ curlntlm *state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
+
+ (void) data; /* In case it gets unused by nop log macros. */
+
+ if(!checkprefix("NTLM", header))
+ return CURLE_BAD_CONTENT_ENCODING;
+
+ header += strlen("NTLM");
+ while(*header && ISSPACE(*header))
+ header++;
+
+ if(*header) {
+ ntlm->challenge = strdup(header);
+ if(!ntlm->challenge)
+ return CURLE_OUT_OF_MEMORY;
+
+ *state = NTLMSTATE_TYPE2; /* We got a type-2 message */
+ }
+ else {
+ if(*state == NTLMSTATE_LAST) {
+ infof(data, "NTLM auth restarted");
+ Curl_http_auth_cleanup_ntlm_wb(conn);
+ }
+ else if(*state == NTLMSTATE_TYPE3) {
+ infof(data, "NTLM handshake rejected");
+ Curl_http_auth_cleanup_ntlm_wb(conn);
+ *state = NTLMSTATE_NONE;
+ return CURLE_REMOTE_ACCESS_DENIED;
+ }
+ else if(*state >= NTLMSTATE_TYPE1) {
+ infof(data, "NTLM handshake failure (internal error)");
+ return CURLE_REMOTE_ACCESS_DENIED;
+ }
+
+ *state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
+ }
+
+ return CURLE_OK;
+}
+
+/*
+ * This is for creating ntlm header output by delegating challenge/response
+ * to Samba's winbind daemon helper ntlm_auth.
+ */
+CURLcode Curl_output_ntlm_wb(struct Curl_easy *data, struct connectdata *conn,
+ bool proxy)
+{
+ /* point to the address of the pointer that holds the string to send to the
+ server, which is for a plain host or for an HTTP proxy */
+ char **allocuserpwd;
+ /* point to the name and password for this */
+ const char *userp;
+ struct ntlmdata *ntlm;
+ curlntlm *state;
+ struct auth *authp;
+
+ CURLcode res = CURLE_OK;
+
+ DEBUGASSERT(conn);
+ DEBUGASSERT(data);
+
+ if(proxy) {
+#ifndef CURL_DISABLE_PROXY
+ allocuserpwd = &data->state.aptr.proxyuserpwd;
+ userp = conn->http_proxy.user;
+ ntlm = &conn->proxyntlm;
+ state = &conn->proxy_ntlm_state;
+ authp = &data->state.authproxy;
+#else
+ return CURLE_NOT_BUILT_IN;
+#endif
+ }
+ else {
+ allocuserpwd = &data->state.aptr.userpwd;
+ userp = conn->user;
+ ntlm = &conn->ntlm;
+ state = &conn->http_ntlm_state;
+ authp = &data->state.authhost;
+ }
+ authp->done = FALSE;
+
+ /* not set means empty */
+ if(!userp)
+ userp = "";
+
+ switch(*state) {
+ case NTLMSTATE_TYPE1:
+ default:
+ /* Use Samba's 'winbind' daemon to support NTLM authentication,
+ * by delegating the NTLM challenge/response protocol to a helper
+ * in ntlm_auth.
+ * https://web.archive.org/web/20190925164737
+ * /devel.squid-cache.org/ntlm/squid_helper_protocol.html
+ * https://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
+ * https://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
+ * Preprocessor symbol 'NTLM_WB_ENABLED' is defined when this
+ * feature is enabled and 'NTLM_WB_FILE' symbol holds absolute
+ * filename of ntlm_auth helper.
+ * If NTLM authentication using winbind fails, go back to original
+ * request handling process.
+ */
+ /* Create communication with ntlm_auth */
+ res = ntlm_wb_init(data, ntlm, userp);
+ if(res)
+ return res;
+ res = ntlm_wb_response(data, ntlm, "YR\n", *state);
+ if(res)
+ return res;
+
+ free(*allocuserpwd);
+ *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
+ proxy ? "Proxy-" : "",
+ ntlm->response);
+ DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
+ Curl_safefree(ntlm->response);
+ if(!*allocuserpwd)
+ return CURLE_OUT_OF_MEMORY;
+ break;
+
+ case NTLMSTATE_TYPE2: {
+ char *input = aprintf("TT %s\n", ntlm->challenge);
+ if(!input)
+ return CURLE_OUT_OF_MEMORY;
+ res = ntlm_wb_response(data, ntlm, input, *state);
+ free(input);
+ if(res)
+ return res;
+
+ free(*allocuserpwd);
+ *allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
+ proxy ? "Proxy-" : "",
+ ntlm->response);
+ DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
+ *state = NTLMSTATE_TYPE3; /* we sent a type-3 */
+ authp->done = TRUE;
+ Curl_http_auth_cleanup_ntlm_wb(conn);
+ if(!*allocuserpwd)
+ return CURLE_OUT_OF_MEMORY;
+ break;
+ }
+ case NTLMSTATE_TYPE3:
+ /* connection is already authenticated,
+ * don't send a header in future requests */
+ *state = NTLMSTATE_LAST;
+ /* FALLTHROUGH */
+ case NTLMSTATE_LAST:
+ Curl_safefree(*allocuserpwd);
+ authp->done = TRUE;
+ break;
+ }
+
+ return CURLE_OK;
+}
+
+void Curl_http_auth_cleanup_ntlm_wb(struct connectdata *conn)
+{
+ ntlm_wb_cleanup(&conn->ntlm);
+ ntlm_wb_cleanup(&conn->proxyntlm);
+}
+
+#endif /* !CURL_DISABLE_HTTP && USE_NTLM && NTLM_WB_ENABLED */
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-31 22:15:57 +0000