mirror of
https://github.com/profanity-im/profanity.git
synced 2024-11-03 19:37:16 -05:00
1648 lines
56 KiB
C
1648 lines
56 KiB
C
/*
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* omemo.c
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*
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* Copyright (C) 2019 Paul Fariello <paul@fariello.eu>
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* Copyright (C) 2019 Michael Vetter <jubalh@iodoru.org>
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*
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* This file is part of Profanity.
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*
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* Profanity is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Profanity is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Profanity. If not, see <https://www.gnu.org/licenses/>.
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*
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* In addition, as a special exception, the copyright holders give permission to
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* link the code of portions of this program with the OpenSSL library under
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* certain conditions as described in each individual source file, and
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* distribute linked combinations including the two.
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*
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* You must obey the GNU General Public License in all respects for all of the
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* code used other than OpenSSL. If you modify file(s) with this exception, you
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* may extend this exception to your version of the file(s), but you are not
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* obligated to do so. If you do not wish to do so, delete this exception
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* statement from your version. If you delete this exception statement from all
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* source files in the program, then also delete it here.
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*
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*/
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <glib.h>
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#include <pthread.h>
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#include <signal/key_helper.h>
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#include <signal/protocol.h>
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#include <signal/signal_protocol.h>
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#include <signal/session_builder.h>
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#include <signal/session_cipher.h>
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#include <gcrypt.h>
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#include "config/account.h"
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#include "config/files.h"
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#include "config/preferences.h"
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#include "log.h"
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#include "omemo/crypto.h"
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#include "omemo/omemo.h"
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#include "omemo/store.h"
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#include "ui/ui.h"
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#include "ui/window_list.h"
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#include "xmpp/connection.h"
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#include "xmpp/muc.h"
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#include "xmpp/omemo.h"
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#include "xmpp/roster_list.h"
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#include "xmpp/xmpp.h"
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static gboolean loaded;
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static void _generate_pre_keys(int count);
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static void _generate_signed_pre_key(void);
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static gboolean _load_identity(void);
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static void _load_trust(void);
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static void _load_sessions(void);
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static void _load_known_devices(void);
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static void _lock(void *user_data);
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static void _unlock(void *user_data);
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static void _omemo_log(int level, const char *message, size_t len, void *user_data);
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static gboolean _handle_own_device_list(const char *const jid, GList *device_list);
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static gboolean _handle_device_list_start_session(const char *const jid, GList *device_list);
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static char * _omemo_fingerprint(ec_public_key *identity, gboolean formatted);
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static unsigned char *_omemo_fingerprint_decode(const char *const fingerprint, size_t *len);
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static char * _omemo_unformat_fingerprint(const char *const fingerprint_formatted);
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static void _cache_device_identity(const char *const jid, uint32_t device_id, ec_public_key *identity);
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static void _g_hash_table_free(GHashTable *hash_table);
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typedef gboolean (*OmemoDeviceListHandler)(const char *const jid, GList *device_list);
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struct omemo_context_t {
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pthread_mutexattr_t attr;
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pthread_mutex_t lock;
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signal_context *signal;
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uint32_t device_id;
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GHashTable *device_list;
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GHashTable *device_list_handler;
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ratchet_identity_key_pair *identity_key_pair;
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uint32_t registration_id;
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uint32_t signed_pre_key_id;
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signal_protocol_store_context *store;
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GHashTable *session_store;
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GHashTable *pre_key_store;
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GHashTable *signed_pre_key_store;
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identity_key_store_t identity_key_store;
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GHashTable *device_ids;
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GString *identity_filename;
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GKeyFile *identity_keyfile;
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GString *trust_filename;
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GKeyFile *trust_keyfile;
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GString *sessions_filename;
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GKeyFile *sessions_keyfile;
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GHashTable *known_devices;
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GString *known_devices_filename;
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GKeyFile *known_devices_keyfile;
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Autocomplete fingerprint_ac;
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};
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static omemo_context omemo_ctx;
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void
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omemo_init(void)
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{
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log_info("OMEMO: initialising");
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if (omemo_crypto_init() != 0) {
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cons_show("Error initializing OMEMO crypto");
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}
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pthread_mutexattr_init(&omemo_ctx.attr);
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pthread_mutexattr_settype(&omemo_ctx.attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&omemo_ctx.lock, &omemo_ctx.attr);
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omemo_ctx.fingerprint_ac = autocomplete_new();
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}
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void
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omemo_close(void)
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{
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if (omemo_ctx.fingerprint_ac) {
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autocomplete_free(omemo_ctx.fingerprint_ac);
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omemo_ctx.fingerprint_ac = NULL;
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}
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}
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void
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omemo_on_connect(ProfAccount *account)
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{
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GError *error = NULL;
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if (signal_context_create(&omemo_ctx.signal, &omemo_ctx) != 0) {
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cons_show("Error initializing OMEMO context");
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return;
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}
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if (signal_context_set_log_function(omemo_ctx.signal, _omemo_log) != 0) {
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cons_show("Error initializing OMEMO log");
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}
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signal_crypto_provider crypto_provider = {
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.random_func = omemo_random_func,
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.hmac_sha256_init_func = omemo_hmac_sha256_init_func,
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.hmac_sha256_update_func = omemo_hmac_sha256_update_func,
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.hmac_sha256_final_func = omemo_hmac_sha256_final_func,
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.hmac_sha256_cleanup_func = omemo_hmac_sha256_cleanup_func,
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.sha512_digest_init_func = omemo_sha512_digest_init_func,
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.sha512_digest_update_func = omemo_sha512_digest_update_func,
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.sha512_digest_final_func = omemo_sha512_digest_final_func,
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.sha512_digest_cleanup_func = omemo_sha512_digest_cleanup_func,
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.encrypt_func = omemo_encrypt_func,
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.decrypt_func = omemo_decrypt_func,
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.user_data = NULL
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};
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if (signal_context_set_crypto_provider(omemo_ctx.signal, &crypto_provider) != 0) {
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cons_show("Error initializing OMEMO crypto");
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return;
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}
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signal_context_set_locking_functions(omemo_ctx.signal, _lock, _unlock);
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signal_protocol_store_context_create(&omemo_ctx.store, omemo_ctx.signal);
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omemo_ctx.session_store = session_store_new();
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signal_protocol_session_store session_store = {
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.load_session_func = load_session,
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.get_sub_device_sessions_func = get_sub_device_sessions,
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.store_session_func = store_session,
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.contains_session_func = contains_session,
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.delete_session_func = delete_session,
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.delete_all_sessions_func = delete_all_sessions,
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.destroy_func = NULL,
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.user_data = omemo_ctx.session_store
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};
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signal_protocol_store_context_set_session_store(omemo_ctx.store, &session_store);
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omemo_ctx.pre_key_store = pre_key_store_new();
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signal_protocol_pre_key_store pre_key_store = {
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.load_pre_key = load_pre_key,
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.store_pre_key = store_pre_key,
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.contains_pre_key = contains_pre_key,
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.remove_pre_key = remove_pre_key,
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.destroy_func = NULL,
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.user_data = omemo_ctx.pre_key_store
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};
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signal_protocol_store_context_set_pre_key_store(omemo_ctx.store, &pre_key_store);
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omemo_ctx.signed_pre_key_store = signed_pre_key_store_new();
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signal_protocol_signed_pre_key_store signed_pre_key_store = {
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.load_signed_pre_key = load_signed_pre_key,
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.store_signed_pre_key = store_signed_pre_key,
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.contains_signed_pre_key = contains_signed_pre_key,
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.remove_signed_pre_key = remove_signed_pre_key,
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.destroy_func = NULL,
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.user_data = omemo_ctx.signed_pre_key_store
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};
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signal_protocol_store_context_set_signed_pre_key_store(omemo_ctx.store, &signed_pre_key_store);
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identity_key_store_new(&omemo_ctx.identity_key_store);
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signal_protocol_identity_key_store identity_key_store = {
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.get_identity_key_pair = get_identity_key_pair,
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.get_local_registration_id = get_local_registration_id,
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.save_identity = save_identity,
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.is_trusted_identity = is_trusted_identity,
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.destroy_func = NULL,
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.user_data = &omemo_ctx.identity_key_store
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};
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signal_protocol_store_context_set_identity_key_store(omemo_ctx.store, &identity_key_store);
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loaded = FALSE;
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omemo_ctx.device_list = g_hash_table_new_full(g_str_hash, g_str_equal, free, (GDestroyNotify)g_list_free);
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omemo_ctx.device_list_handler = g_hash_table_new_full(g_str_hash, g_str_equal, free, NULL);
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omemo_ctx.known_devices = g_hash_table_new_full(g_str_hash, g_str_equal, free, (GDestroyNotify)_g_hash_table_free);
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char *omemodir = files_get_data_path(DIR_OMEMO);
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GString *basedir = g_string_new(omemodir);
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free(omemodir);
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gchar *account_dir = str_replace(account->jid, "@", "_at_");
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g_string_append(basedir, "/");
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g_string_append(basedir, account_dir);
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g_string_append(basedir, "/");
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free(account_dir);
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omemo_ctx.identity_filename = g_string_new(basedir->str);
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g_string_append(omemo_ctx.identity_filename, "identity.txt");
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omemo_ctx.trust_filename = g_string_new(basedir->str);
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g_string_append(omemo_ctx.trust_filename, "trust.txt");
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omemo_ctx.sessions_filename = g_string_new(basedir->str);
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g_string_append(omemo_ctx.sessions_filename, "sessions.txt");
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omemo_ctx.known_devices_filename = g_string_new(basedir->str);
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g_string_append(omemo_ctx.known_devices_filename, "known_devices.txt");
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errno = 0;
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int res = g_mkdir_with_parents(basedir->str, S_IRWXU);
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if (res == -1) {
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char *errmsg = strerror(errno);
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if (errmsg) {
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log_error("OMEMO: error creating directory: %s, %s", basedir->str, errmsg);
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} else {
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log_error("OMEMO: creating directory: %s", basedir->str);
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}
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}
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g_string_free(basedir, TRUE);
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omemo_devicelist_subscribe();
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omemo_ctx.identity_keyfile = g_key_file_new();
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omemo_ctx.trust_keyfile = g_key_file_new();
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omemo_ctx.sessions_keyfile = g_key_file_new();
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omemo_ctx.known_devices_keyfile = g_key_file_new();
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if (g_key_file_load_from_file(omemo_ctx.identity_keyfile, omemo_ctx.identity_filename->str, G_KEY_FILE_KEEP_COMMENTS, &error)) {
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if (!_load_identity()) {
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return;
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}
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} else if (error->code != G_FILE_ERROR_NOENT) {
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log_warning("OMEMO: error loading identity from: %s, %s", omemo_ctx.identity_filename->str, error->message);
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return;
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}
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error = NULL;
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if (g_key_file_load_from_file(omemo_ctx.trust_keyfile, omemo_ctx.trust_filename->str, G_KEY_FILE_KEEP_COMMENTS, &error)) {
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_load_trust();
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} else if (error->code != G_FILE_ERROR_NOENT) {
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log_warning("OMEMO: error loading trust from: %s, %s", omemo_ctx.trust_filename->str, error->message);
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}
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error = NULL;
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if (g_key_file_load_from_file(omemo_ctx.sessions_keyfile, omemo_ctx.sessions_filename->str, G_KEY_FILE_KEEP_COMMENTS, &error)) {
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_load_sessions();
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} else if (error->code != G_FILE_ERROR_NOENT) {
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log_warning("OMEMO: error loading sessions from: %s, %s", omemo_ctx.sessions_filename->str, error->message);
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}
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error = NULL;
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if (g_key_file_load_from_file(omemo_ctx.known_devices_keyfile, omemo_ctx.known_devices_filename->str, G_KEY_FILE_KEEP_COMMENTS, &error)) {
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_load_known_devices();
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} else if (error->code != G_FILE_ERROR_NOENT) {
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log_warning("OMEMO: error loading known devices from: %s, %s", omemo_ctx.known_devices_filename->str, error->message);
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}
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}
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void
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omemo_on_disconnect(void)
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{
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if (!loaded) {
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return;
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}
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_g_hash_table_free(omemo_ctx.signed_pre_key_store);
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_g_hash_table_free(omemo_ctx.pre_key_store);
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_g_hash_table_free(omemo_ctx.device_list_handler);
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g_string_free(omemo_ctx.identity_filename, TRUE);
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g_key_file_free(omemo_ctx.identity_keyfile);
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g_string_free(omemo_ctx.trust_filename, TRUE);
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g_key_file_free(omemo_ctx.trust_keyfile);
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g_string_free(omemo_ctx.sessions_filename, TRUE);
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g_key_file_free(omemo_ctx.sessions_keyfile);
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_g_hash_table_free(omemo_ctx.session_store);
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g_string_free(omemo_ctx.known_devices_filename, TRUE);
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g_key_file_free(omemo_ctx.known_devices_keyfile);
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}
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void
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omemo_generate_crypto_materials(ProfAccount *account)
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{
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if (loaded) {
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return;
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}
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log_info("Generate long term OMEMO cryptography metarials");
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/* Device ID */
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gcry_randomize(&omemo_ctx.device_id, 4, GCRY_VERY_STRONG_RANDOM);
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omemo_ctx.device_id &= 0x7fffffff;
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g_key_file_set_uint64(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_DEVICE_ID, omemo_ctx.device_id);
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log_info("OMEMO: device id: %d", omemo_ctx.device_id);
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/* Identity key */
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signal_protocol_key_helper_generate_identity_key_pair(&omemo_ctx.identity_key_pair, omemo_ctx.signal);
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ec_public_key_serialize(&omemo_ctx.identity_key_store.public, ratchet_identity_key_pair_get_public(omemo_ctx.identity_key_pair));
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char *identity_key_public = g_base64_encode(signal_buffer_data(omemo_ctx.identity_key_store.public), signal_buffer_len(omemo_ctx.identity_key_store.public));
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g_key_file_set_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_IDENTITY_KEY_PUBLIC, identity_key_public);
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g_free(identity_key_public);
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ec_private_key_serialize(&omemo_ctx.identity_key_store.private, ratchet_identity_key_pair_get_private(omemo_ctx.identity_key_pair));
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char *identity_key_private = g_base64_encode(signal_buffer_data(omemo_ctx.identity_key_store.private), signal_buffer_len(omemo_ctx.identity_key_store.private));
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g_key_file_set_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_IDENTITY_KEY_PRIVATE, identity_key_private);
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g_free(identity_key_private);
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/* Registration ID */
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signal_protocol_key_helper_generate_registration_id(&omemo_ctx.registration_id, 0, omemo_ctx.signal);
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g_key_file_set_uint64(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_REGISTRATION_ID, omemo_ctx.registration_id);
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/* Pre keys */
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_generate_pre_keys(100);
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/* Signed pre key */
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_generate_signed_pre_key();
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omemo_identity_keyfile_save();
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loaded = TRUE;
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omemo_publish_crypto_materials();
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omemo_start_sessions();
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}
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void
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omemo_publish_crypto_materials(void)
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{
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if (loaded != TRUE) {
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log_error("OMEMO: cannot publish crypto materials before they are generated");
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return;
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}
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Jid *jid = jid_create(connection_get_fulljid());
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/* Ensure we get our current device list, and it gets updated with our
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* device_id */
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g_hash_table_insert(omemo_ctx.device_list_handler, strdup(jid->barejid), _handle_own_device_list);
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omemo_devicelist_request(jid->barejid);
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omemo_bundle_publish(true);
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jid_destroy(jid);
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}
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void
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omemo_start_sessions(void)
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{
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GSList *contacts = roster_get_contacts(ROSTER_ORD_NAME);
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if (contacts) {
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GSList *curr = contacts;
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for (curr = contacts; curr != NULL; curr = g_slist_next(curr)){
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PContact contact = curr->data;
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const char *jid = p_contact_barejid(contact);
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omemo_start_session(jid);
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}
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g_slist_free(contacts);
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}
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}
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void
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omemo_start_session(const char *const barejid)
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{
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log_info("OMEMO: start session with %s", barejid);
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GList *device_list = g_hash_table_lookup(omemo_ctx.device_list, barejid);
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if (!device_list) {
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log_info("OMEMO: missing device list for %s", barejid);
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omemo_devicelist_request(barejid);
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g_hash_table_insert(omemo_ctx.device_list_handler, strdup(barejid), _handle_device_list_start_session);
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return;
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}
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GList *device_id;
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for (device_id = device_list; device_id != NULL; device_id = device_id->next) {
|
|
omemo_bundle_request(barejid, GPOINTER_TO_INT(device_id->data), omemo_start_device_session_handle_bundle, free, strdup(barejid));
|
|
}
|
|
}
|
|
|
|
void
|
|
omemo_start_muc_sessions(const char *const roomjid)
|
|
{
|
|
GList *roster = muc_roster(roomjid);
|
|
GList *iter;
|
|
for (iter = roster; iter != NULL; iter = iter->next) {
|
|
Occupant *occupant = (Occupant *)iter->data;
|
|
if (occupant->jid != NULL) {
|
|
Jid *jid = jid_create(occupant->jid);
|
|
omemo_start_session(jid->barejid);
|
|
jid_destroy(jid);
|
|
} else {
|
|
log_error("OMEMO: cannot get real jid for %s in %s", occupant->nick, roomjid);
|
|
}
|
|
}
|
|
g_list_free(roster);
|
|
}
|
|
|
|
gboolean
|
|
omemo_loaded(void)
|
|
{
|
|
return loaded;
|
|
}
|
|
|
|
uint32_t
|
|
omemo_device_id(void)
|
|
{
|
|
return omemo_ctx.device_id;
|
|
}
|
|
|
|
void
|
|
omemo_identity_key(unsigned char **output, size_t *length)
|
|
{
|
|
signal_buffer *buffer = NULL;
|
|
ec_public_key_serialize(&buffer, ratchet_identity_key_pair_get_public(omemo_ctx.identity_key_pair));
|
|
*length = signal_buffer_len(buffer);
|
|
*output = malloc(*length);
|
|
memcpy(*output, signal_buffer_data(buffer), *length);
|
|
signal_buffer_free(buffer);
|
|
}
|
|
|
|
void
|
|
omemo_signed_prekey(unsigned char **output, size_t *length)
|
|
{
|
|
session_signed_pre_key *signed_pre_key;
|
|
signal_buffer *buffer = NULL;
|
|
|
|
if (signal_protocol_signed_pre_key_load_key(omemo_ctx.store, &signed_pre_key, omemo_ctx.signed_pre_key_id) != SG_SUCCESS) {
|
|
*output = NULL;
|
|
*length = 0;
|
|
return;
|
|
}
|
|
|
|
ec_public_key_serialize(&buffer, ec_key_pair_get_public(session_signed_pre_key_get_key_pair(signed_pre_key)));
|
|
SIGNAL_UNREF(signed_pre_key);
|
|
*length = signal_buffer_len(buffer);
|
|
*output = malloc(*length);
|
|
memcpy(*output, signal_buffer_data(buffer), *length);
|
|
signal_buffer_free(buffer);
|
|
}
|
|
|
|
void
|
|
omemo_signed_prekey_signature(unsigned char **output, size_t *length)
|
|
{
|
|
session_signed_pre_key *signed_pre_key;
|
|
|
|
if (signal_protocol_signed_pre_key_load_key(omemo_ctx.store, &signed_pre_key, omemo_ctx.signed_pre_key_id) != SG_SUCCESS) {
|
|
*output = NULL;
|
|
*length = 0;
|
|
return;
|
|
}
|
|
|
|
*length = session_signed_pre_key_get_signature_len(signed_pre_key);
|
|
*output = malloc(*length);
|
|
memcpy(*output, session_signed_pre_key_get_signature(signed_pre_key), *length);
|
|
SIGNAL_UNREF(signed_pre_key);
|
|
}
|
|
|
|
void
|
|
omemo_prekeys(GList **prekeys, GList **ids, GList **lengths)
|
|
{
|
|
GHashTableIter iter;
|
|
gpointer id;
|
|
|
|
g_hash_table_iter_init(&iter, omemo_ctx.pre_key_store);
|
|
while (g_hash_table_iter_next(&iter, &id, NULL)) {
|
|
session_pre_key *pre_key;
|
|
int ret;
|
|
ret = signal_protocol_pre_key_load_key(omemo_ctx.store, &pre_key, GPOINTER_TO_INT(id));
|
|
if (ret != SG_SUCCESS) {
|
|
continue;
|
|
}
|
|
|
|
signal_buffer *public_key;
|
|
ec_public_key_serialize(&public_key, ec_key_pair_get_public(session_pre_key_get_key_pair(pre_key)));
|
|
SIGNAL_UNREF(pre_key);
|
|
size_t length = signal_buffer_len(public_key);
|
|
unsigned char *prekey_value = malloc(length);
|
|
memcpy(prekey_value, signal_buffer_data(public_key), length);
|
|
signal_buffer_free(public_key);
|
|
|
|
*prekeys = g_list_append(*prekeys, prekey_value);
|
|
*ids = g_list_append(*ids, GINT_TO_POINTER(id));
|
|
*lengths = g_list_append(*lengths, GINT_TO_POINTER(length));
|
|
}
|
|
}
|
|
|
|
void
|
|
omemo_set_device_list(const char *const from, GList * device_list)
|
|
{
|
|
Jid *jid;
|
|
if (from) {
|
|
jid = jid_create(from);
|
|
} else {
|
|
jid = jid_create(connection_get_fulljid());
|
|
}
|
|
|
|
g_hash_table_insert(omemo_ctx.device_list, strdup(jid->barejid), device_list);
|
|
|
|
OmemoDeviceListHandler handler = g_hash_table_lookup(omemo_ctx.device_list_handler, jid->barejid);
|
|
if (handler) {
|
|
gboolean keep = handler(jid->barejid, device_list);
|
|
if (!keep) {
|
|
g_hash_table_remove(omemo_ctx.device_list_handler, jid->barejid);
|
|
}
|
|
}
|
|
|
|
jid_destroy(jid);
|
|
}
|
|
|
|
GKeyFile *
|
|
omemo_identity_keyfile(void)
|
|
{
|
|
return omemo_ctx.identity_keyfile;
|
|
}
|
|
|
|
void
|
|
omemo_identity_keyfile_save(void)
|
|
{
|
|
GError *error = NULL;
|
|
|
|
if (!g_key_file_save_to_file(omemo_ctx.identity_keyfile, omemo_ctx.identity_filename->str, &error)) {
|
|
log_error("OMEMO: error saving identity to: %s, %s", omemo_ctx.identity_filename->str, error->message);
|
|
}
|
|
}
|
|
|
|
GKeyFile *
|
|
omemo_trust_keyfile(void)
|
|
{
|
|
return omemo_ctx.trust_keyfile;
|
|
}
|
|
|
|
void
|
|
omemo_trust_keyfile_save(void)
|
|
{
|
|
GError *error = NULL;
|
|
|
|
if (!g_key_file_save_to_file(omemo_ctx.trust_keyfile, omemo_ctx.trust_filename->str, &error)) {
|
|
log_error("OMEMO: error saving trust to: %s, %s", omemo_ctx.trust_filename->str, error->message);
|
|
}
|
|
}
|
|
|
|
GKeyFile *
|
|
omemo_sessions_keyfile(void)
|
|
{
|
|
return omemo_ctx.sessions_keyfile;
|
|
}
|
|
|
|
void
|
|
omemo_sessions_keyfile_save(void)
|
|
{
|
|
GError *error = NULL;
|
|
|
|
if (!g_key_file_save_to_file(omemo_ctx.sessions_keyfile, omemo_ctx.sessions_filename->str, &error)) {
|
|
log_error("OMEMO: error saving sessions to: %s, %s", omemo_ctx.sessions_filename->str, error->message);
|
|
}
|
|
}
|
|
|
|
void
|
|
omemo_known_devices_keyfile_save(void)
|
|
{
|
|
GError *error = NULL;
|
|
|
|
if (!g_key_file_save_to_file(omemo_ctx.known_devices_keyfile, omemo_ctx.known_devices_filename->str, &error)) {
|
|
log_error("OMEMO: error saving known devices to: %s, %s", omemo_ctx.known_devices_filename->str, error->message);
|
|
}
|
|
}
|
|
|
|
void
|
|
omemo_start_device_session(const char *const jid, uint32_t device_id,
|
|
GList *prekeys, uint32_t signed_prekey_id,
|
|
const unsigned char *const signed_prekey_raw, size_t signed_prekey_len,
|
|
const unsigned char *const signature, size_t signature_len,
|
|
const unsigned char *const identity_key_raw, size_t identity_key_len)
|
|
{
|
|
signal_protocol_address address = {
|
|
.name = jid,
|
|
.name_len = strlen(jid),
|
|
.device_id = device_id,
|
|
};
|
|
|
|
ec_public_key *identity_key;
|
|
curve_decode_point(&identity_key, identity_key_raw, identity_key_len, omemo_ctx.signal);
|
|
_cache_device_identity(jid, device_id, identity_key);
|
|
|
|
gboolean trusted = is_trusted_identity(&address, (uint8_t *)identity_key_raw, identity_key_len, &omemo_ctx.identity_key_store);
|
|
|
|
if (!trusted) {
|
|
goto out;
|
|
}
|
|
|
|
if (!contains_session(&address, omemo_ctx.session_store)) {
|
|
int res;
|
|
session_pre_key_bundle *bundle;
|
|
signal_protocol_address *address;
|
|
|
|
address = malloc(sizeof(signal_protocol_address));
|
|
address->name = strdup(jid);
|
|
address->name_len = strlen(jid);
|
|
address->device_id = device_id;
|
|
|
|
session_builder *builder;
|
|
res = session_builder_create(&builder, omemo_ctx.store, address, omemo_ctx.signal);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot create session builder for %s device %d", jid, device_id);
|
|
goto out;
|
|
}
|
|
|
|
int prekey_index;
|
|
gcry_randomize(&prekey_index, sizeof(int), GCRY_STRONG_RANDOM);
|
|
prekey_index %= g_list_length(prekeys);
|
|
omemo_key_t *prekey = g_list_nth_data(prekeys, prekey_index);
|
|
|
|
ec_public_key *prekey_public;
|
|
curve_decode_point(&prekey_public, prekey->data, prekey->length, omemo_ctx.signal);
|
|
ec_public_key *signed_prekey;
|
|
curve_decode_point(&signed_prekey, signed_prekey_raw, signed_prekey_len, omemo_ctx.signal);
|
|
|
|
res = session_pre_key_bundle_create(&bundle, 0, device_id, prekey->id, prekey_public, signed_prekey_id, signed_prekey, signature, signature_len, identity_key);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot create pre key bundle for %s device %d", jid, device_id);
|
|
goto out;
|
|
}
|
|
|
|
res = session_builder_process_pre_key_bundle(builder, bundle);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot process pre key bundle for %s device %d", jid, device_id);
|
|
goto out;
|
|
}
|
|
|
|
log_info("OMEMO: create session with %s device %d", jid, device_id);
|
|
}
|
|
|
|
out:
|
|
SIGNAL_UNREF(identity_key);
|
|
}
|
|
|
|
char *
|
|
omemo_on_message_send(ProfWin *win, const char *const message, gboolean request_receipt, gboolean muc)
|
|
{
|
|
char *id = NULL;
|
|
int res;
|
|
Jid *jid = jid_create(connection_get_fulljid());
|
|
GList *keys = NULL;
|
|
|
|
unsigned char *key;
|
|
unsigned char *iv;
|
|
unsigned char *ciphertext;
|
|
unsigned char *tag;
|
|
unsigned char *key_tag;
|
|
size_t ciphertext_len, tag_len;
|
|
|
|
ciphertext_len = strlen(message);
|
|
ciphertext = malloc(ciphertext_len);
|
|
tag_len = AES128_GCM_TAG_LENGTH;
|
|
tag = gcry_malloc_secure(tag_len);
|
|
key_tag = gcry_malloc_secure(AES128_GCM_KEY_LENGTH + AES128_GCM_TAG_LENGTH);
|
|
|
|
key = gcry_random_bytes_secure(AES128_GCM_KEY_LENGTH, GCRY_VERY_STRONG_RANDOM);
|
|
iv = gcry_random_bytes_secure(AES128_GCM_IV_LENGTH, GCRY_VERY_STRONG_RANDOM);
|
|
|
|
res = aes128gcm_encrypt(ciphertext, &ciphertext_len, tag, &tag_len, (const unsigned char * const)message, strlen(message), iv, key);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot encrypt message");
|
|
goto out;
|
|
}
|
|
|
|
memcpy(key_tag, key, AES128_GCM_KEY_LENGTH);
|
|
memcpy(key_tag + AES128_GCM_KEY_LENGTH, tag, AES128_GCM_TAG_LENGTH);
|
|
|
|
GList *recipients = NULL;
|
|
if (muc) {
|
|
ProfMucWin *mucwin = (ProfMucWin *)win;
|
|
assert(mucwin->memcheck == PROFMUCWIN_MEMCHECK);
|
|
GList *roster = muc_roster(mucwin->roomjid);
|
|
GList *iter;
|
|
for (iter = roster; iter != NULL; iter = iter->next) {
|
|
Occupant *occupant = (Occupant *)iter->data;
|
|
Jid *jid = jid_create(occupant->jid);
|
|
if (!jid->barejid) {
|
|
log_warning("OMEMO: missing barejid for MUC %s occupant %s", mucwin->roomjid, occupant->nick);
|
|
} else {
|
|
recipients = g_list_append(recipients, strdup(jid->barejid));
|
|
}
|
|
jid_destroy(jid);
|
|
}
|
|
g_list_free(roster);
|
|
} else {
|
|
ProfChatWin *chatwin = (ProfChatWin *)win;
|
|
assert(chatwin->memcheck == PROFCHATWIN_MEMCHECK);
|
|
recipients = g_list_append(recipients, strdup(chatwin->barejid));
|
|
}
|
|
|
|
GList *device_ids_iter;
|
|
|
|
omemo_ctx.identity_key_store.recv = false;
|
|
|
|
GList *recipients_iter;
|
|
for (recipients_iter = recipients; recipients_iter != NULL; recipients_iter = recipients_iter->next) {
|
|
GList *recipient_device_id = NULL;
|
|
recipient_device_id = g_hash_table_lookup(omemo_ctx.device_list, recipients_iter->data);
|
|
if (!recipient_device_id) {
|
|
log_warning("OMEMO: cannot find device ids for %s", recipients_iter->data);
|
|
continue;
|
|
}
|
|
|
|
for (device_ids_iter = recipient_device_id; device_ids_iter != NULL; device_ids_iter = device_ids_iter->next) {
|
|
int res;
|
|
ciphertext_message *ciphertext;
|
|
session_cipher *cipher;
|
|
signal_protocol_address address = {
|
|
.name = recipients_iter->data,
|
|
.name_len = strlen(recipients_iter->data),
|
|
.device_id = GPOINTER_TO_INT(device_ids_iter->data)
|
|
};
|
|
|
|
res = session_cipher_create(&cipher, omemo_ctx.store, &address, omemo_ctx.signal);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot create cipher for %s device id %d", address.name, address.device_id);
|
|
continue;
|
|
}
|
|
|
|
res = session_cipher_encrypt(cipher, key_tag, AES128_GCM_KEY_LENGTH + AES128_GCM_TAG_LENGTH, &ciphertext);
|
|
session_cipher_free(cipher);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot encrypt key for %s device id %d", address.name, address.device_id);
|
|
continue;
|
|
}
|
|
signal_buffer *buffer = ciphertext_message_get_serialized(ciphertext);
|
|
omemo_key_t *key = malloc(sizeof(omemo_key_t));
|
|
key->length = signal_buffer_len(buffer);
|
|
key->data = malloc(key->length);
|
|
memcpy(key->data, signal_buffer_data(buffer), key->length);
|
|
key->device_id = GPOINTER_TO_INT(device_ids_iter->data);
|
|
key->prekey = ciphertext_message_get_type(ciphertext) == CIPHERTEXT_PREKEY_TYPE;
|
|
keys = g_list_append(keys, key);
|
|
SIGNAL_UNREF(ciphertext);
|
|
}
|
|
}
|
|
|
|
g_list_free_full(recipients, free);
|
|
|
|
if (!muc) {
|
|
GList *sender_device_id = g_hash_table_lookup(omemo_ctx.device_list, jid->barejid);
|
|
for (device_ids_iter = sender_device_id; device_ids_iter != NULL; device_ids_iter = device_ids_iter->next) {
|
|
int res;
|
|
ciphertext_message *ciphertext;
|
|
session_cipher *cipher;
|
|
signal_protocol_address address = {
|
|
.name = jid->barejid,
|
|
.name_len = strlen(jid->barejid),
|
|
.device_id = GPOINTER_TO_INT(device_ids_iter->data)
|
|
};
|
|
|
|
res = session_cipher_create(&cipher, omemo_ctx.store, &address, omemo_ctx.signal);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot create cipher for %s device id %d", address.name, address.device_id);
|
|
continue;
|
|
}
|
|
|
|
res = session_cipher_encrypt(cipher, key_tag, AES128_GCM_KEY_LENGTH + AES128_GCM_TAG_LENGTH, &ciphertext);
|
|
session_cipher_free(cipher);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot encrypt key for %s device id %d", address.name, address.device_id);
|
|
continue;
|
|
}
|
|
signal_buffer *buffer = ciphertext_message_get_serialized(ciphertext);
|
|
omemo_key_t *key = malloc(sizeof(omemo_key_t));
|
|
key->length = signal_buffer_len(buffer);
|
|
key->data = malloc(key->length);
|
|
memcpy(key->data, signal_buffer_data(buffer), key->length);
|
|
key->device_id = GPOINTER_TO_INT(device_ids_iter->data);
|
|
key->prekey = ciphertext_message_get_type(ciphertext) == CIPHERTEXT_PREKEY_TYPE;
|
|
keys = g_list_append(keys, key);
|
|
SIGNAL_UNREF(ciphertext);
|
|
}
|
|
}
|
|
|
|
if (muc) {
|
|
ProfMucWin *mucwin = (ProfMucWin *)win;
|
|
assert(mucwin->memcheck == PROFMUCWIN_MEMCHECK);
|
|
id = message_send_chat_omemo(mucwin->roomjid, omemo_ctx.device_id, keys, iv, AES128_GCM_IV_LENGTH, ciphertext, ciphertext_len, request_receipt, TRUE);
|
|
} else {
|
|
ProfChatWin *chatwin = (ProfChatWin *)win;
|
|
assert(chatwin->memcheck == PROFCHATWIN_MEMCHECK);
|
|
id = message_send_chat_omemo(chatwin->barejid, omemo_ctx.device_id, keys, iv, AES128_GCM_IV_LENGTH, ciphertext, ciphertext_len, request_receipt, FALSE);
|
|
}
|
|
|
|
out:
|
|
jid_destroy(jid);
|
|
g_list_free_full(keys, (GDestroyNotify)omemo_key_free);
|
|
free(ciphertext);
|
|
gcry_free(key);
|
|
gcry_free(iv);
|
|
gcry_free(tag);
|
|
gcry_free(key_tag);
|
|
|
|
return id;
|
|
}
|
|
|
|
char *
|
|
omemo_on_message_recv(const char *const from_jid, uint32_t sid,
|
|
const unsigned char *const iv, size_t iv_len, GList *keys,
|
|
const unsigned char *const payload, size_t payload_len, gboolean muc, gboolean *trusted)
|
|
{
|
|
unsigned char *plaintext = NULL;
|
|
Jid *sender = NULL;
|
|
Jid *from = jid_create(from_jid);
|
|
if (!from) {
|
|
log_error("Invalid jid %s", from_jid);
|
|
goto out;
|
|
}
|
|
|
|
int res;
|
|
GList *key_iter;
|
|
omemo_key_t *key = NULL;
|
|
for (key_iter = keys; key_iter != NULL; key_iter = key_iter->next) {
|
|
if (((omemo_key_t *)key_iter->data)->device_id == omemo_ctx.device_id) {
|
|
key = key_iter->data;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!key) {
|
|
log_warning("OMEMO: Received a message with no corresponding key");
|
|
goto out;
|
|
}
|
|
|
|
if (muc) {
|
|
GList *roster = muc_roster(from->barejid);
|
|
GList *iter;
|
|
for (iter = roster; iter != NULL; iter = iter->next) {
|
|
Occupant *occupant = (Occupant *)iter->data;
|
|
if (g_strcmp0(occupant->nick, from->resourcepart) == 0) {
|
|
sender = jid_create(occupant->jid);
|
|
break;
|
|
}
|
|
}
|
|
g_list_free(roster);
|
|
if (!sender) {
|
|
log_warning("OMEMO: cannot find MUC message sender fulljid");
|
|
goto out;
|
|
}
|
|
} else {
|
|
sender = jid_create(from->barejid);
|
|
}
|
|
|
|
session_cipher *cipher;
|
|
signal_buffer *plaintext_key;
|
|
signal_protocol_address address = {
|
|
.name = sender->barejid,
|
|
.name_len = strlen(sender->barejid),
|
|
.device_id = sid
|
|
};
|
|
|
|
res = session_cipher_create(&cipher, omemo_ctx.store, &address, omemo_ctx.signal);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot create session cipher");
|
|
goto out;
|
|
}
|
|
|
|
if (key->prekey) {
|
|
log_debug("OMEMO: decrypting message with prekey");
|
|
pre_key_signal_message *message;
|
|
ec_public_key *their_identity_key;
|
|
signal_buffer *identity_buffer = NULL;
|
|
|
|
omemo_ctx.identity_key_store.recv = true;
|
|
|
|
pre_key_signal_message_deserialize(&message, key->data, key->length, omemo_ctx.signal);
|
|
their_identity_key = pre_key_signal_message_get_identity_key(message);
|
|
|
|
res = session_cipher_decrypt_pre_key_signal_message(cipher, message, NULL, &plaintext_key);
|
|
|
|
omemo_ctx.identity_key_store.recv = false;
|
|
|
|
/* Perform a real check of the identity */
|
|
ec_public_key_serialize(&identity_buffer, their_identity_key);
|
|
*trusted = is_trusted_identity(&address, signal_buffer_data(identity_buffer),
|
|
signal_buffer_len(identity_buffer), &omemo_ctx.identity_key_store);
|
|
|
|
/* Replace used pre_key in bundle */
|
|
uint32_t pre_key_id = pre_key_signal_message_get_pre_key_id(message);
|
|
ec_key_pair *ec_pair;
|
|
session_pre_key *new_pre_key;
|
|
curve_generate_key_pair(omemo_ctx.signal, &ec_pair);
|
|
session_pre_key_create(&new_pre_key, pre_key_id, ec_pair);
|
|
signal_protocol_pre_key_store_key(omemo_ctx.store, new_pre_key);
|
|
SIGNAL_UNREF(new_pre_key);
|
|
SIGNAL_UNREF(message);
|
|
SIGNAL_UNREF(ec_pair);
|
|
omemo_bundle_publish(true);
|
|
|
|
if (res == 0) {
|
|
/* Start a new session */
|
|
omemo_bundle_request(sender->barejid, sid, omemo_start_device_session_handle_bundle, free, strdup(sender->barejid));
|
|
}
|
|
} else {
|
|
log_debug("OMEMO: decrypting message with existing session");
|
|
signal_message *message = NULL;
|
|
|
|
res = signal_message_deserialize(&message, key->data, key->length, omemo_ctx.signal);
|
|
|
|
if (res < 0) {
|
|
log_error("OMEMO: cannot deserialize message");
|
|
} else {
|
|
res = session_cipher_decrypt_signal_message(cipher, message, NULL, &plaintext_key);
|
|
*trusted = true;
|
|
SIGNAL_UNREF(message);
|
|
}
|
|
}
|
|
|
|
session_cipher_free(cipher);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot decrypt message key");
|
|
goto out;
|
|
}
|
|
|
|
if (signal_buffer_len(plaintext_key) != AES128_GCM_KEY_LENGTH + AES128_GCM_TAG_LENGTH) {
|
|
log_error("OMEMO: invalid key length");
|
|
signal_buffer_free(plaintext_key);
|
|
goto out;
|
|
}
|
|
|
|
size_t plaintext_len = payload_len;
|
|
plaintext = malloc(plaintext_len + 1);
|
|
res = aes128gcm_decrypt(plaintext, &plaintext_len, payload, payload_len, iv,
|
|
signal_buffer_data(plaintext_key),
|
|
signal_buffer_data(plaintext_key) + AES128_GCM_KEY_LENGTH);
|
|
signal_buffer_free(plaintext_key);
|
|
if (res != 0) {
|
|
log_error("OMEMO: cannot decrypt message: %s", gcry_strerror(res));
|
|
free(plaintext);
|
|
plaintext = NULL;
|
|
goto out;
|
|
}
|
|
|
|
plaintext[plaintext_len] = '\0';
|
|
|
|
out:
|
|
jid_destroy(from);
|
|
jid_destroy(sender);
|
|
return (char *)plaintext;
|
|
}
|
|
|
|
char *
|
|
omemo_format_fingerprint(const char *const fingerprint)
|
|
{
|
|
char *output = malloc(strlen(fingerprint) + strlen(fingerprint) / 8);
|
|
|
|
int i, j;
|
|
for (i = 0, j = 0; i < strlen(fingerprint); i++) {
|
|
if (i > 0 && i % 8 == 0) {
|
|
output[j++] = '-';
|
|
}
|
|
output[j++] = fingerprint[i];
|
|
}
|
|
|
|
output[j] = '\0';
|
|
|
|
return output;
|
|
}
|
|
|
|
static char *
|
|
_omemo_unformat_fingerprint(const char *const fingerprint_formatted)
|
|
{
|
|
/* Unformat fingerprint */
|
|
char *fingerprint = malloc(strlen(fingerprint_formatted));
|
|
int i;
|
|
int j;
|
|
for (i = 0, j = 0; fingerprint_formatted[i] != '\0'; i++) {
|
|
if (!g_ascii_isxdigit(fingerprint_formatted[i])) {
|
|
continue;
|
|
}
|
|
fingerprint[j++] = fingerprint_formatted[i];
|
|
}
|
|
|
|
fingerprint[j] = '\0';
|
|
|
|
return fingerprint;
|
|
}
|
|
|
|
char *
|
|
omemo_own_fingerprint(gboolean formatted)
|
|
{
|
|
ec_public_key *identity = ratchet_identity_key_pair_get_public(omemo_ctx.identity_key_pair);
|
|
return _omemo_fingerprint(identity, formatted);
|
|
}
|
|
|
|
GList *
|
|
omemo_known_device_identities(const char *const jid)
|
|
{
|
|
GHashTable *known_identities = g_hash_table_lookup(omemo_ctx.known_devices, jid);
|
|
if (!known_identities) {
|
|
return NULL;
|
|
}
|
|
|
|
return g_hash_table_get_keys(known_identities);
|
|
}
|
|
|
|
gboolean
|
|
omemo_is_trusted_identity(const char *const jid, const char *const fingerprint)
|
|
{
|
|
GHashTable *known_identities = g_hash_table_lookup(omemo_ctx.known_devices, jid);
|
|
if (!known_identities) {
|
|
return FALSE;
|
|
}
|
|
|
|
void *device_id = g_hash_table_lookup(known_identities, fingerprint);
|
|
if (!device_id) {
|
|
return FALSE;
|
|
}
|
|
|
|
signal_protocol_address address = {
|
|
.name = jid,
|
|
.name_len = strlen(jid),
|
|
.device_id = GPOINTER_TO_INT(device_id),
|
|
};
|
|
|
|
size_t fingerprint_len;
|
|
unsigned char *fingerprint_raw = _omemo_fingerprint_decode(fingerprint, &fingerprint_len);
|
|
unsigned char djb_type[] = {'\x05'};
|
|
signal_buffer *buffer = signal_buffer_create(djb_type, 1);
|
|
buffer = signal_buffer_append(buffer, fingerprint_raw, fingerprint_len);
|
|
|
|
gboolean trusted = is_trusted_identity(&address, signal_buffer_data(buffer), signal_buffer_len(buffer), &omemo_ctx.identity_key_store);
|
|
|
|
free(fingerprint_raw);
|
|
signal_buffer_free(buffer);
|
|
|
|
return trusted;
|
|
}
|
|
|
|
static char *
|
|
_omemo_fingerprint(ec_public_key *identity, gboolean formatted)
|
|
{
|
|
int i;
|
|
signal_buffer *identity_public_key;
|
|
|
|
ec_public_key_serialize(&identity_public_key, identity);
|
|
size_t identity_public_key_len = signal_buffer_len(identity_public_key);
|
|
unsigned char *identity_public_key_data = signal_buffer_data(identity_public_key);
|
|
|
|
/* Skip first byte corresponding to signal DJB_TYPE */
|
|
identity_public_key_len--;
|
|
identity_public_key_data = &identity_public_key_data[1];
|
|
|
|
char *fingerprint = malloc(identity_public_key_len * 2 + 1);
|
|
|
|
for (i = 0; i < identity_public_key_len; i++) {
|
|
fingerprint[i * 2] = (identity_public_key_data[i] & 0xf0) >> 4;
|
|
fingerprint[i * 2] += '0';
|
|
if (fingerprint[i * 2] > '9') {
|
|
fingerprint[i * 2] += 0x27;
|
|
}
|
|
|
|
fingerprint[(i * 2) + 1] = identity_public_key_data[i] & 0x0f;
|
|
fingerprint[(i * 2) + 1] += '0';
|
|
if (fingerprint[(i * 2) + 1] > '9') {
|
|
fingerprint[(i * 2) + 1] += 0x27;
|
|
}
|
|
}
|
|
|
|
fingerprint[i * 2] = '\0';
|
|
signal_buffer_free(identity_public_key);
|
|
|
|
if (!formatted) {
|
|
return fingerprint;
|
|
} else {
|
|
char *formatted_fingerprint = omemo_format_fingerprint(fingerprint);
|
|
free(fingerprint);
|
|
return formatted_fingerprint;
|
|
}
|
|
}
|
|
|
|
static unsigned char *
|
|
_omemo_fingerprint_decode(const char *const fingerprint, size_t *len)
|
|
{
|
|
unsigned char *output = malloc(strlen(fingerprint) / 2 + 1);
|
|
|
|
int i;
|
|
int j;
|
|
for (i = 0, j = 0; i < strlen(fingerprint);) {
|
|
if (!g_ascii_isxdigit(fingerprint[i])) {
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
output[j] = g_ascii_xdigit_value(fingerprint[i++]) << 4;
|
|
output[j] |= g_ascii_xdigit_value(fingerprint[i++]);
|
|
j++;
|
|
}
|
|
|
|
*len = j;
|
|
|
|
return output;
|
|
}
|
|
|
|
void
|
|
omemo_trust(const char *const jid, const char *const fingerprint_formatted)
|
|
{
|
|
size_t len;
|
|
|
|
GHashTable *known_identities = g_hash_table_lookup(omemo_ctx.known_devices, jid);
|
|
if (!known_identities) {
|
|
log_warning("OMEMO: cannot trust unknown device: %s", fingerprint_formatted);
|
|
cons_show("Cannot trust unknown device: %s", fingerprint_formatted);
|
|
return;
|
|
}
|
|
|
|
char *fingerprint = _omemo_unformat_fingerprint(fingerprint_formatted);
|
|
|
|
uint32_t device_id = GPOINTER_TO_INT(g_hash_table_lookup(known_identities, fingerprint));
|
|
free(fingerprint);
|
|
|
|
if (!device_id) {
|
|
log_warning("OMEMO: cannot trust unknown device: %s", fingerprint_formatted);
|
|
cons_show("Cannot trust unknown device: %s", fingerprint_formatted);
|
|
return;
|
|
}
|
|
|
|
/* TODO should not hardcode DJB_TYPE here
|
|
* should instead store identity key in known_identities along with
|
|
* device_id */
|
|
signal_protocol_address address = {
|
|
.name = jid,
|
|
.name_len = strlen(jid),
|
|
.device_id = device_id,
|
|
};
|
|
unsigned char *fingerprint_raw = _omemo_fingerprint_decode(fingerprint_formatted, &len);
|
|
unsigned char djb_type[] = {'\x05'};
|
|
signal_buffer *buffer = signal_buffer_create(djb_type, 1);
|
|
buffer = signal_buffer_append(buffer, fingerprint_raw, len);
|
|
save_identity(&address, signal_buffer_data(buffer), signal_buffer_len(buffer), &omemo_ctx.identity_key_store);
|
|
free(fingerprint_raw);
|
|
signal_buffer_free(buffer);
|
|
|
|
omemo_bundle_request(jid, device_id, omemo_start_device_session_handle_bundle, free, strdup(jid));
|
|
}
|
|
|
|
void
|
|
omemo_untrust(const char *const jid, const char *const fingerprint_formatted)
|
|
{
|
|
size_t len;
|
|
unsigned char *identity = _omemo_fingerprint_decode(fingerprint_formatted, &len);
|
|
|
|
GHashTableIter iter;
|
|
gpointer key, value;
|
|
|
|
GHashTable *trusted = g_hash_table_lookup(omemo_ctx.identity_key_store.trusted, jid);
|
|
if (!trusted) {
|
|
return;
|
|
}
|
|
|
|
g_hash_table_iter_init(&iter, trusted);
|
|
while (g_hash_table_iter_next(&iter, &key, &value)) {
|
|
signal_buffer *buffer = value;
|
|
unsigned char *original = signal_buffer_data(buffer);
|
|
/* Skip DJB_TYPE byte */
|
|
original++;
|
|
if ((signal_buffer_len(buffer) - 1) == len && memcmp(original, identity, len) == 0) {
|
|
g_hash_table_remove(trusted, key);
|
|
}
|
|
}
|
|
free(identity);
|
|
|
|
char *fingerprint = _omemo_unformat_fingerprint(fingerprint_formatted);
|
|
|
|
/* Remove existing session */
|
|
GHashTable *known_identities = g_hash_table_lookup(omemo_ctx.known_devices, jid);
|
|
if (!known_identities) {
|
|
log_error("OMEMO: cannot find known device while untrusting a fingerprint");
|
|
goto out;
|
|
}
|
|
|
|
uint32_t device_id = GPOINTER_TO_INT(g_hash_table_lookup(known_identities, fingerprint));
|
|
if (!device_id) {
|
|
log_error("OMEMO: cannot find device id while untrusting a fingerprint");
|
|
goto out;
|
|
}
|
|
signal_protocol_address address = {
|
|
.name = jid,
|
|
.name_len = strlen(jid),
|
|
.device_id = device_id
|
|
};
|
|
|
|
delete_session(&address, omemo_ctx.session_store);
|
|
|
|
/* Remove from keyfile */
|
|
char *device_id_str = g_strdup_printf("%d", device_id);
|
|
g_key_file_remove_key(omemo_ctx.trust_keyfile, jid, device_id_str, NULL);
|
|
g_free(device_id_str);
|
|
omemo_trust_keyfile_save();
|
|
|
|
out:
|
|
free(fingerprint);
|
|
}
|
|
|
|
static void
|
|
_lock(void *user_data)
|
|
{
|
|
omemo_context *ctx = (omemo_context *)user_data;
|
|
pthread_mutex_lock(&ctx->lock);
|
|
}
|
|
|
|
static void
|
|
_unlock(void *user_data)
|
|
{
|
|
omemo_context *ctx = (omemo_context *)user_data;
|
|
pthread_mutex_unlock(&ctx->lock);
|
|
}
|
|
|
|
static void
|
|
_omemo_log(int level, const char *message, size_t len, void *user_data)
|
|
{
|
|
switch (level) {
|
|
case SG_LOG_ERROR:
|
|
log_error("OMEMO: %s", message);
|
|
break;
|
|
case SG_LOG_WARNING:
|
|
log_warning("OMEMO: %s", message);
|
|
break;
|
|
case SG_LOG_NOTICE:
|
|
case SG_LOG_INFO:
|
|
log_info("OMEMO: %s", message);
|
|
break;
|
|
case SG_LOG_DEBUG:
|
|
log_debug("OMEMO: %s", message);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
_handle_own_device_list(const char *const jid, GList *device_list)
|
|
{
|
|
if (!g_list_find(device_list, GINT_TO_POINTER(omemo_ctx.device_id))) {
|
|
device_list = g_list_copy(device_list);
|
|
device_list = g_list_append(device_list, GINT_TO_POINTER(omemo_ctx.device_id));
|
|
g_hash_table_insert(omemo_ctx.device_list, strdup(jid), device_list);
|
|
omemo_devicelist_publish(device_list);
|
|
}
|
|
|
|
GList *device_id;
|
|
for (device_id = device_list; device_id != NULL; device_id = device_id->next) {
|
|
omemo_bundle_request(jid, GPOINTER_TO_INT(device_id->data), omemo_start_device_session_handle_bundle, free, strdup(jid));
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
_handle_device_list_start_session(const char *const jid, GList *device_list)
|
|
{
|
|
omemo_start_session(jid);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
omemo_key_free(omemo_key_t *key)
|
|
{
|
|
if (key == NULL) {
|
|
return;
|
|
}
|
|
|
|
free(key->data);
|
|
free(key);
|
|
}
|
|
|
|
char*
|
|
omemo_fingerprint_autocomplete(const char *const search_str, gboolean previous)
|
|
{
|
|
return autocomplete_complete(omemo_ctx.fingerprint_ac, search_str, FALSE, previous);
|
|
}
|
|
|
|
void
|
|
omemo_fingerprint_autocomplete_reset(void)
|
|
{
|
|
autocomplete_reset(omemo_ctx.fingerprint_ac);
|
|
}
|
|
|
|
gboolean
|
|
omemo_automatic_start(const char *const recipient)
|
|
{
|
|
gboolean result = FALSE;
|
|
char *account_name = session_get_account_name();
|
|
ProfAccount *account = accounts_get_account(account_name);
|
|
prof_omemopolicy_t policy;
|
|
|
|
if (account->omemo_policy) {
|
|
// check default account setting
|
|
if (g_strcmp0(account->omemo_policy, "manual") == 0) {
|
|
policy = PROF_OMEMOPOLICY_MANUAL;
|
|
}
|
|
if (g_strcmp0(account->omemo_policy, "opportunistic") == 0) {
|
|
policy = PROF_OMEMOPOLICY_AUTOMATIC;
|
|
}
|
|
if (g_strcmp0(account->omemo_policy, "always") == 0) {
|
|
policy = PROF_OMEMOPOLICY_ALWAYS;
|
|
}
|
|
} else {
|
|
// check global setting
|
|
char *pref_omemo_policy = prefs_get_string(PREF_OMEMO_POLICY);
|
|
|
|
// pref defaults to manual
|
|
policy = PROF_OMEMOPOLICY_AUTOMATIC;
|
|
|
|
if (strcmp(pref_omemo_policy, "manual") == 0) {
|
|
policy = PROF_OMEMOPOLICY_MANUAL;
|
|
} else if (strcmp(pref_omemo_policy, "always") == 0) {
|
|
policy = PROF_OMEMOPOLICY_ALWAYS;
|
|
}
|
|
|
|
prefs_free_string(pref_omemo_policy);
|
|
}
|
|
|
|
switch (policy) {
|
|
case PROF_OMEMOPOLICY_MANUAL:
|
|
result = FALSE;
|
|
break;
|
|
case PROF_OMEMOPOLICY_AUTOMATIC:
|
|
if (g_list_find_custom(account->omemo_enabled, recipient, (GCompareFunc)g_strcmp0)) {
|
|
result = TRUE;
|
|
} else if (g_list_find_custom(account->omemo_disabled, recipient, (GCompareFunc)g_strcmp0)) {
|
|
result = FALSE;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
break;
|
|
case PROF_OMEMOPOLICY_ALWAYS:
|
|
if (g_list_find_custom(account->omemo_disabled, recipient, (GCompareFunc)g_strcmp0)) {
|
|
result = FALSE;
|
|
} else {
|
|
return TRUE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
account_free(account);
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
_load_identity(void)
|
|
{
|
|
GError *error = NULL;
|
|
log_info("Loading OMEMO identity");
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|
|
|
/* Device ID */
|
|
error = NULL;
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|
omemo_ctx.device_id = g_key_file_get_uint64(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_DEVICE_ID, &error);
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if (error != NULL) {
|
|
log_error("OMEMO: cannot load device id: %s", error->message);
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|
return FALSE;
|
|
}
|
|
log_info("OMEMO: device id: %d", omemo_ctx.device_id);
|
|
|
|
/* Registration ID */
|
|
error = NULL;
|
|
omemo_ctx.registration_id = g_key_file_get_uint64(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_REGISTRATION_ID, &error);
|
|
if (error != NULL) {
|
|
log_error("OMEMO: cannot load registration id: %s", error->message);
|
|
return FALSE;
|
|
}
|
|
|
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/* Identity key */
|
|
error = NULL;
|
|
char *identity_key_public_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_IDENTITY_KEY_PUBLIC, &error);
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if (!identity_key_public_b64) {
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log_error("OMEMO: cannot load identity public key: %s", error->message);
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|
return FALSE;
|
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}
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|
|
|
size_t identity_key_public_len;
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unsigned char *identity_key_public = g_base64_decode(identity_key_public_b64, &identity_key_public_len);
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g_free(identity_key_public_b64);
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omemo_ctx.identity_key_store.public = signal_buffer_create(identity_key_public, identity_key_public_len);
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|
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error = NULL;
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char *identity_key_private_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_IDENTITY_KEY_PRIVATE, &error);
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if (!identity_key_private_b64) {
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log_error("OMEMO: cannot load identity private key: %s", error->message);
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return FALSE;
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}
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|
|
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size_t identity_key_private_len;
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unsigned char *identity_key_private = g_base64_decode(identity_key_private_b64, &identity_key_private_len);
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g_free(identity_key_private_b64);
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omemo_ctx.identity_key_store.private = signal_buffer_create(identity_key_private, identity_key_private_len);
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|
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ec_public_key *public_key;
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curve_decode_point(&public_key, identity_key_public, identity_key_public_len, omemo_ctx.signal);
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ec_private_key *private_key;
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curve_decode_private_point(&private_key, identity_key_private, identity_key_private_len, omemo_ctx.signal);
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ratchet_identity_key_pair_create(&omemo_ctx.identity_key_pair, public_key, private_key);
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|
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g_free(identity_key_public);
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g_free(identity_key_private);
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|
|
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char **keys = NULL;
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int i;
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/* Pre keys */
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i = 0;
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keys = g_key_file_get_keys(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_PREKEYS, NULL, NULL);
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if (keys) {
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for (i = 0; keys[i] != NULL; i++) {
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char *pre_key_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_PREKEYS, keys[i], NULL);
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size_t pre_key_len;
|
|
unsigned char *pre_key = g_base64_decode(pre_key_b64, &pre_key_len);
|
|
g_free(pre_key_b64);
|
|
signal_buffer *buffer = signal_buffer_create(pre_key, pre_key_len);
|
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g_free(pre_key);
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g_hash_table_insert(omemo_ctx.pre_key_store, GINT_TO_POINTER(strtoul(keys[i], NULL, 10)), buffer);
|
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}
|
|
|
|
g_strfreev(keys);
|
|
}
|
|
|
|
/* Ensure we have at least 100 pre keys */
|
|
if (i < 100) {
|
|
_generate_pre_keys(100 - i);
|
|
}
|
|
|
|
/* Signed pre keys */
|
|
i = 0;
|
|
keys = g_key_file_get_keys(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_SIGNED_PREKEYS, NULL, NULL);
|
|
if (keys) {
|
|
for (i = 0; keys[i] != NULL; i++) {
|
|
char *signed_pre_key_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_SIGNED_PREKEYS, keys[i], NULL);
|
|
size_t signed_pre_key_len;
|
|
unsigned char *signed_pre_key = g_base64_decode(signed_pre_key_b64, &signed_pre_key_len);
|
|
g_free(signed_pre_key_b64);
|
|
signal_buffer *buffer = signal_buffer_create(signed_pre_key, signed_pre_key_len);
|
|
g_free(signed_pre_key);
|
|
g_hash_table_insert(omemo_ctx.signed_pre_key_store, GINT_TO_POINTER(strtoul(keys[i], NULL, 10)), buffer);
|
|
omemo_ctx.signed_pre_key_id = strtoul(keys[i], NULL, 10);
|
|
}
|
|
g_strfreev(keys);
|
|
}
|
|
|
|
if (i == 0) {
|
|
_generate_signed_pre_key();
|
|
}
|
|
|
|
loaded = TRUE;
|
|
|
|
omemo_identity_keyfile_save();
|
|
omemo_start_sessions();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
_load_trust(void)
|
|
{
|
|
char **keys = NULL;
|
|
char **groups = g_key_file_get_groups(omemo_ctx.trust_keyfile, NULL);
|
|
if (groups) {
|
|
int i;
|
|
for (i = 0; groups[i] != NULL; i++) {
|
|
GHashTable *trusted;
|
|
|
|
trusted = g_hash_table_lookup(omemo_ctx.identity_key_store.trusted, groups[i]);
|
|
if (!trusted) {
|
|
trusted = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, (GDestroyNotify)signal_buffer_free);
|
|
g_hash_table_insert(omemo_ctx.identity_key_store.trusted, strdup(groups[i]), trusted);
|
|
}
|
|
|
|
keys = g_key_file_get_keys(omemo_ctx.trust_keyfile, groups[i], NULL, NULL);
|
|
int j;
|
|
for (j = 0; keys[j] != NULL; j++) {
|
|
char *key_b64 = g_key_file_get_string(omemo_ctx.trust_keyfile, groups[i], keys[j], NULL);
|
|
size_t key_len;
|
|
unsigned char *key = g_base64_decode(key_b64, &key_len);
|
|
g_free(key_b64);
|
|
signal_buffer *buffer = signal_buffer_create(key, key_len);
|
|
g_free(key);
|
|
uint32_t device_id = strtoul(keys[j], NULL, 10);
|
|
g_hash_table_insert(trusted, GINT_TO_POINTER(device_id), buffer);
|
|
}
|
|
g_strfreev(keys);
|
|
}
|
|
g_strfreev(groups);
|
|
}
|
|
}
|
|
|
|
static void
|
|
_load_sessions(void)
|
|
{
|
|
int i;
|
|
char **groups = g_key_file_get_groups(omemo_ctx.sessions_keyfile, NULL);
|
|
if (groups) {
|
|
for (i = 0; groups[i] != NULL; i++) {
|
|
int j;
|
|
GHashTable *device_store = NULL;
|
|
|
|
device_store = g_hash_table_lookup(omemo_ctx.session_store, groups[i]);
|
|
if (!device_store) {
|
|
device_store = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, (GDestroyNotify)signal_buffer_free);
|
|
g_hash_table_insert(omemo_ctx.session_store, strdup(groups[i]), device_store);
|
|
}
|
|
|
|
char **keys = g_key_file_get_keys(omemo_ctx.sessions_keyfile, groups[i], NULL, NULL);
|
|
for (j = 0; keys[j] != NULL; j++) {
|
|
uint32_t id = strtoul(keys[j], NULL, 10);
|
|
char *record_b64 = g_key_file_get_string(omemo_ctx.sessions_keyfile, groups[i], keys[j], NULL);
|
|
size_t record_len;
|
|
unsigned char *record = g_base64_decode(record_b64, &record_len);
|
|
g_free(record_b64);
|
|
signal_buffer *buffer = signal_buffer_create(record, record_len);
|
|
g_free(record);
|
|
g_hash_table_insert(device_store, GINT_TO_POINTER(id), buffer);
|
|
}
|
|
g_strfreev(keys);
|
|
}
|
|
g_strfreev(groups);
|
|
}
|
|
}
|
|
|
|
static void
|
|
_load_known_devices(void)
|
|
{
|
|
int i;
|
|
char **groups = g_key_file_get_groups(omemo_ctx.known_devices_keyfile, NULL);
|
|
if (groups) {
|
|
for (i = 0; groups[i] != NULL; i++) {
|
|
int j;
|
|
GHashTable *known_identities = NULL;
|
|
|
|
known_identities = g_hash_table_lookup(omemo_ctx.known_devices, groups[i]);
|
|
if (!known_identities) {
|
|
known_identities = g_hash_table_new_full(g_str_hash, g_str_equal, free, NULL);
|
|
g_hash_table_insert(omemo_ctx.known_devices, strdup(groups[i]), known_identities);
|
|
}
|
|
|
|
char **keys = g_key_file_get_keys(omemo_ctx.known_devices_keyfile, groups[i], NULL, NULL);
|
|
for (j = 0; keys[j] != NULL; j++) {
|
|
uint32_t device_id = strtoul(keys[j], NULL, 10);
|
|
char *fingerprint = g_key_file_get_string(omemo_ctx.known_devices_keyfile, groups[i], keys[j], NULL);
|
|
g_hash_table_insert(known_identities, strdup(fingerprint), GINT_TO_POINTER(device_id));
|
|
g_free(fingerprint);
|
|
}
|
|
g_strfreev(keys);
|
|
}
|
|
g_strfreev(groups);
|
|
}
|
|
}
|
|
|
|
static void
|
|
_cache_device_identity(const char *const jid, uint32_t device_id, ec_public_key *identity)
|
|
{
|
|
GHashTable *known_identities = g_hash_table_lookup(omemo_ctx.known_devices, jid);
|
|
if (!known_identities) {
|
|
known_identities = g_hash_table_new_full(g_str_hash, g_str_equal, free, NULL);
|
|
g_hash_table_insert(omemo_ctx.known_devices, strdup(jid), known_identities);
|
|
}
|
|
|
|
char *fingerprint = _omemo_fingerprint(identity, FALSE);
|
|
log_info("OMEMO: cache identity for %s:%d: %s", jid, device_id, fingerprint);
|
|
g_hash_table_insert(known_identities, strdup(fingerprint), GINT_TO_POINTER(device_id));
|
|
|
|
char *device_id_str = g_strdup_printf("%d", device_id);
|
|
g_key_file_set_string(omemo_ctx.known_devices_keyfile, jid, device_id_str, fingerprint);
|
|
g_free(device_id_str);
|
|
omemo_known_devices_keyfile_save();
|
|
|
|
char *formatted_fingerprint = omemo_format_fingerprint(fingerprint);
|
|
autocomplete_add(omemo_ctx.fingerprint_ac, formatted_fingerprint);
|
|
free(formatted_fingerprint);
|
|
free(fingerprint);
|
|
}
|
|
|
|
static void
|
|
_g_hash_table_free(GHashTable *hash_table)
|
|
{
|
|
g_hash_table_remove_all(hash_table);
|
|
g_hash_table_unref(hash_table);
|
|
}
|
|
|
|
static void
|
|
_generate_pre_keys(int count)
|
|
{
|
|
unsigned int start;
|
|
gcry_randomize(&start, sizeof(unsigned int), GCRY_VERY_STRONG_RANDOM);
|
|
signal_protocol_key_helper_pre_key_list_node *pre_keys_head;
|
|
signal_protocol_key_helper_generate_pre_keys(&pre_keys_head, start, count, omemo_ctx.signal);
|
|
|
|
signal_protocol_key_helper_pre_key_list_node *p;
|
|
for (p = pre_keys_head; p != NULL; p = signal_protocol_key_helper_key_list_next(p)) {
|
|
session_pre_key *prekey = signal_protocol_key_helper_key_list_element(p);
|
|
signal_protocol_pre_key_store_key(omemo_ctx.store, prekey);
|
|
}
|
|
signal_protocol_key_helper_key_list_free(pre_keys_head);
|
|
}
|
|
|
|
static void
|
|
_generate_signed_pre_key(void)
|
|
{
|
|
session_signed_pre_key *signed_pre_key;
|
|
struct timeval tv;
|
|
gettimeofday(&tv, NULL);
|
|
unsigned long long timestamp = (unsigned long long)(tv.tv_sec) * 1000 + (unsigned long long)(tv.tv_usec) / 1000;
|
|
|
|
omemo_ctx.signed_pre_key_id = 1;
|
|
signal_protocol_key_helper_generate_signed_pre_key(&signed_pre_key, omemo_ctx.identity_key_pair, omemo_ctx.signed_pre_key_id, timestamp, omemo_ctx.signal);
|
|
signal_protocol_signed_pre_key_store_key(omemo_ctx.store, signed_pre_key);
|
|
SIGNAL_UNREF(signed_pre_key);
|
|
}
|