added MirOTR

git-svn-id: http://svn.miranda-ng.org/main/trunk@83 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 330 insertions, 0 deletions

diff --git a/plugins/MirOTR/libotr-3.2.0/src/context.c b/plugins/MirOTR/libotr-3.2.0/src/context.c
new file mode 100644
index 0000000000..8807b89145
--- /dev/null
+++ b/plugins/MirOTR/libotr-3.2.0/src/context.c
@@ -0,0 +1,330 @@
+/*
+ *  Off-the-Record Messaging library
+ *  Copyright (C) 2004-2008  Ian Goldberg, Chris Alexander, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/* system headers */
+#include <stdlib.h>
+#include <assert.h>
+
+/* libgcrypt headers */
+#include <gcrypt.h>
+
+/* libotr headers */
+#include "context.h"
+
+/* 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 * otrl_context_new(const char * user, const char * accountname,
+	const char * protocol)
+{
+	return new_context(user, accountname, 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
+ * 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. */
+ConnContext * otrl_context_find(OtrlUserState us, const char *user,
+	const char *accountname, const char *protocol, 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 ||
+		(usercmp == 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;
+	}
+	if (usercmp == 0 && acctcmp == 0 && protocmp == 0) {
+	/* Found it! */
+	return *curp;
+	}
+	if (add_if_missing) {
+	ConnContext *newctx;
+	if (addedp) *addedp = 1;
+	newctx = new_context(user, accountname, protocol);
+	newctx->next = *curp;
+	if (*curp) {
+		(*curp)->tous = &(newctx->next);
+	}
+	*curp = newctx;
+	newctx->tous = curp;
+	if (add_app_data) {
+		add_app_data(data, *curp);
+	}
+	return *curp;
+	}
+	return NULL;
+}
+
+/* Find a fingerprint in a given context, perhaps adding it if not
+ * present. */
+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) {
+	if (!memcmp(f->fingerprint, fingerprint, 20)) return f;
+	f = f->next;
+	}
+	/* 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);
+	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);
+	}
+	context->fingerprint_root.next = f;
+	f->tous = &(context->fingerprint_root.next);
+	return f;
+	}
+	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;
+}
+
+/* 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) {
+		memmove(context->preshared_secret, secret, secret_len);
+		context->preshared_secret_len = secret_len;
+	}
+	}
+}
+
+/* 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);
+}
+
+/* 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);
+
+	/* 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
+ * fingerprint_root, forget the whole context (as long as
+ * and_maybe_context is set, and it's PLAINTEXT).  Also, if it's not
+ * the fingerprint_root, but it's the only fingerprint, and we're
+ * PLAINTEXT, forget the whole context if and_maybe_context is set. */
+void otrl_context_forget_fingerprint(Fingerprint *fprint,
+	int and_maybe_context)
+{
+	ConnContext *context = fprint->context;
+	if (fprint == &(context->fingerprint_root)) {
+	if (context->msgstate == OTRL_MSGSTATE_PLAINTEXT &&
+		and_maybe_context) {
+		otrl_context_forget(context);
+	}
+	} else {
+	if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT ||
+		context->active_fingerprint != fprint) {
+		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) {
+		/* 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)
+{
+	if (context->msgstate != OTRL_MSGSTATE_PLAINTEXT) return;
+
+	/* 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) {
+	context->next->tous = context->tous;
+	}
+
+	free(context);
+}
+
+/* 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);
+	otrl_context_forget(us->context_root);
+	}
+}