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matrix-e2e.c
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matrix-e2e.c
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/**
* Matrix end-to-end encryption support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <sqlite3.h>
#include "libmatrix.h"
#include "matrix-api.h"
#include "matrix-e2e.h"
#include "matrix-json.h"
#include "debug.h"
/* json-glib */
#include <json-glib/json-glib.h>
#include "connection.h"
#ifndef MATRIX_NO_E2E
#include "olm/olm.h"
#include <gcrypt.h>
struct _MatrixOlmSession;
struct _MatrixE2EData {
OlmAccount *oa;
gchar *device_id;
gchar *curve25519_pubkey;
gchar *ed25519_pubkey;
sqlite3 *db;
/* Mapping from MatrixHashKeyOlm to MatrixOlmSession */
GHashTable *olm_session_hash;
};
#define PURPLE_CONV_E2E_STATE "e2e"
/* Hung off the Purple conversation with the PURPLE_CONV_E2E_STATE */
typedef struct _MatrixE2ERoomData {
/* Mapping from _MatrixHashKeyInBoundMegOlm to OlmInboundGroupSession */
GHashTable *megolm_sessions_inbound;
} MatrixE2ERoomData;
typedef struct _MatrixHashKeyOlm {
gchar *sender_key;
gchar *sender_id;
} MatrixHashKeyOlm;
typedef struct _MatrixOlmSession {
gchar *sender_key;
gchar *sender_id;
OlmSession *session;
sqlite3_int64 unique;
struct _MatrixOlmSession *next;
} MatrixOlmSession;
typedef struct _MatrixHashKeyInBoundMegOlm {
gchar *sender_key;
gchar *sender_id;
gchar *session_id;
gchar *device_id;
} MatrixHashKeyInBoundMegOlm;
struct _MatrixMediaCryptInfo {
guchar sha256[32];
guchar aes_k[32];
guchar aes_iv[16];
};
static void key_upload_callback(MatrixConnectionData *conn,
gpointer user_data,
struct _JsonNode *json_root,
const char *body,
size_t body_len, const char *content_type);
/* Really clear an area of memory */
static void clear_mem(volatile char *data, size_t len)
{
#ifdef __STDC_LIB_EXT1__
/* Untested! */
memset_s(data, len, '\0', len);
#else
size_t index;
for(index = 0;index < len; index ++)
{
data[index] = '\0';
}
#endif
}
/* Returns a pointer to a freshly allocated buffer of 'n' bytes of random data.
* If it fails it returns NULL.
* TODO: There must be some portable function we can call to do this.
*/
static void *get_random(size_t n)
{
FILE *urandom = fopen("/dev/urandom", "rb");
if (!urandom) {
return NULL;
}
void *buffer = g_malloc(n);
if (fread(buffer, 1, n, urandom) != n) {
g_free(buffer);
buffer = NULL;
}
fclose(urandom);
return buffer;
}
/* GHashFunc for two MatrixHasKeyOlm */
static gboolean olm_inbound_equality(gconstpointer a, gconstpointer b)
{
const MatrixHashKeyOlm *hk_a;
const MatrixHashKeyOlm *hk_b;
hk_a = (const MatrixHashKeyOlm *)a;
hk_b = (const MatrixHashKeyOlm *)b;
return !strcmp(hk_a->sender_key, hk_b->sender_key) &&
!strcmp(hk_a->sender_id, hk_b->sender_id);
}
/* GHashFunc for a _MatrixHashKeyOlm */
static guint olm_inbound_hash(gconstpointer a)
{
const MatrixHashKeyOlm *hk;
hk = (const MatrixHashKeyOlm *)a;
return g_str_hash(hk->sender_key) +
g_str_hash(hk->sender_id);
}
static void olm_hash_key_destroy(gpointer k)
{
MatrixHashKeyOlm *ok = k;
clear_mem(ok->sender_key, strlen(ok->sender_key));
g_free(ok->sender_key);
g_free(ok->sender_id);
g_free(ok);
}
static void free_matrix_olm_session(MatrixOlmSession *msession,
gboolean free_session)
{
g_free(msession->sender_id);
g_free(msession->sender_key);
if (free_session) {
olm_clear_session(msession->session);
g_free(msession->session);
}
}
static void olm_hash_value_destroy(gpointer v)
{
MatrixOlmSession *os = v;
while (os) {
MatrixOlmSession *next = os->next;
free_matrix_olm_session(os, TRUE);
os = next;
}
}
/* GEqualFunc for two MatrixHashKeyInBoundMegOlm */
static gboolean megolm_inbound_equality(gconstpointer a, gconstpointer b)
{
const MatrixHashKeyInBoundMegOlm *hk_a;
const MatrixHashKeyInBoundMegOlm *hk_b;
hk_a = (const MatrixHashKeyInBoundMegOlm *)a;
hk_b = (const MatrixHashKeyInBoundMegOlm *)b;
return !strcmp(hk_a->sender_key, hk_b->sender_key) &&
!strcmp(hk_a->sender_id, hk_b->sender_id) &&
!strcmp(hk_a->session_id, hk_b->session_id) &&
!strcmp(hk_a->device_id, hk_b->device_id);
}
/* GHashFunc for a _MatrixHashKeyInBoundMegOlm */
static guint megolm_inbound_hash(gconstpointer a)
{
const MatrixHashKeyInBoundMegOlm *hk;
hk = (const MatrixHashKeyInBoundMegOlm *)a;
return g_str_hash(hk->sender_key) +
g_str_hash(hk->session_id) +
g_str_hash(hk->sender_id) +
g_str_hash(hk->device_id);
}
static void megolm_inbound_key_destroy(gpointer v)
{
MatrixHashKeyInBoundMegOlm *key = v;
g_free(key->sender_key);
g_free(key->session_id);
g_free(key->sender_id);
g_free(key->device_id);
}
static void megolm_inbound_value_destroy(gpointer v)
{
OlmInboundGroupSession *oigs = v;
olm_clear_inbound_group_session(oigs);
g_free(oigs);
}
static MatrixE2ERoomData *get_e2e_room_data(PurpleConversation *conv)
{
MatrixE2ERoomData *result;
result = purple_conversation_get_data(conv, PURPLE_CONV_E2E_STATE);
if (!result) {
result = g_new0(MatrixE2ERoomData, 1);
purple_conversation_set_data(conv, PURPLE_CONV_E2E_STATE, result);
}
return result;
}
static GHashTable *get_e2e_inbound_megolm_hash(PurpleConversation *conv)
{
MatrixE2ERoomData *rd = get_e2e_room_data(conv);
if (!rd->megolm_sessions_inbound) {
rd->megolm_sessions_inbound = g_hash_table_new_full(megolm_inbound_hash,
megolm_inbound_equality,
megolm_inbound_key_destroy,
megolm_inbound_value_destroy);
}
return rd->megolm_sessions_inbound;
}
static OlmInboundGroupSession *get_inbound_megolm_session(
PurpleConversation *conv,
const gchar *sender_key, const gchar *sender_id,
const gchar *session_id, const gchar *device_id)
{
MatrixHashKeyInBoundMegOlm match;
match.sender_key = (gchar *)sender_key;
match.sender_id = (gchar *)sender_id;
match.session_id = (gchar *)session_id;
match.device_id = (gchar *)device_id;
OlmInboundGroupSession *result =
(OlmInboundGroupSession *)g_hash_table_lookup(
get_e2e_inbound_megolm_hash(conv), &match);
purple_debug_info("matrixprpl", "%s: %s/%s/%s/%s: %p\n",
__func__, device_id, sender_id, sender_key, session_id,
result);
return result;
}
static void store_inbound_megolm_session(PurpleConversation *conv,
const gchar *sender_key, const gchar *sender_id,
const gchar *session_id, const gchar *device_id,
OlmInboundGroupSession *igs) {
MatrixHashKeyInBoundMegOlm *key = g_new0(MatrixHashKeyInBoundMegOlm, 1);
key->sender_key = g_strdup(sender_key);
key->sender_id = g_strdup(sender_id);
key->session_id = g_strdup(session_id);
key->device_id = g_strdup(device_id);
purple_debug_info("matrixprpl", "%s: %s/%s/%s/%s\n",
__func__, device_id, sender_id, sender_key, session_id);
g_hash_table_insert(get_e2e_inbound_megolm_hash(conv), key, igs);
}
/* Find if we already have an OlmSession for this sender/sender_key somewhere
* that this body matches.
*/
static MatrixOlmSession *find_olm_session(MatrixConnectionData *conn,
const char *sender_id, const char *sender_key,
const char *body)
{
gboolean have_sender = FALSE;
MatrixOlmSession *cur_entry, *list_head, *hash_result;
MatrixOlmSession *result = NULL;
MatrixHashKeyOlm match;
purple_debug_info("matrixprpl", "find_olm_session for %s/%s\n",
sender_id, sender_key);
match.sender_key = (gchar *)sender_key;
match.sender_id = (gchar *)sender_id;
hash_result = (MatrixOlmSession *)g_hash_table_lookup(
conn->e2e->olm_session_hash, &match);
cur_entry = hash_result;
list_head = hash_result;
while (cur_entry) {
if (!strcmp(sender_id, cur_entry->sender_id) &&
!strcmp(sender_key, cur_entry->sender_key)) {
size_t ret;
char *body_double = g_strdup(body);
have_sender = TRUE;
ret = olm_matches_inbound_session(cur_entry->session, body_double,
strlen(body));
g_free(body_double);
if (ret == 1) {
purple_debug_info("matrixprpl",
"%s: Found matching session for %s/%s\n",
__func__, sender_id, sender_key);
return cur_entry;
}
if (ret == olm_error()) {
purple_debug_warning("matrixprpl",
"%s: Error while checking session %p for "
"match with %s/%s: %s\n", __func__, cur_entry->session,
sender_id, sender_key,
olm_session_last_error(cur_entry->session));
}
}
cur_entry = cur_entry->next;
}
if (!have_sender) {
MatrixOlmSession **chain = &list_head;
int ret;
/* We have no entries at all for the sender+key, lets load all the
* data from the db
*/
const char *query = "SELECT session_pickle, rowid "
"FROM olmsessions "
"WHERE sender_name = ? AND "
"sender_key = ?";
sqlite3_stmt *dbstmt = NULL;
ret = sqlite3_prepare_v2(conn->e2e->db, query, -1, &dbstmt, NULL);
if (ret != SQLITE_OK || !dbstmt) {
purple_debug_warning("matrixprpl",
"%s: Failed to prep select %d '%s'\n",
__func__, ret, query);
goto bad_sql;
}
ret = sqlite3_bind_text(dbstmt, 1, sender_id, -1, NULL);
if (ret == SQLITE_OK) {
ret = sqlite3_bind_text(dbstmt, 2, sender_key, -1, NULL);
}
if (ret != SQLITE_OK) {
purple_debug_warning("matrixprpl", "%s: Failed to bind %d\n",
__func__, ret);
goto bad_sql;
}
/* Find the end of the chain to get the pointer to update */
for (cur_entry = list_head; cur_entry; cur_entry=cur_entry->next) {
chain = &(cur_entry->next);
}
while (ret = sqlite3_step(dbstmt), ret == SQLITE_ROW) {
const gchar *pickle = (gchar *)sqlite3_column_text(dbstmt, 0);
gchar *dupe_pickle;
if (!pickle) {
purple_debug_warning("matrixprpl",
"%s: Empty pickle for %s/%s\n", __func__,
sender_id, sender_key);
continue;
};
dupe_pickle = g_strdup(pickle);
OlmSession *session = olm_session(g_malloc0(olm_session_size()));
if (olm_unpickle_session(session, "!", 1, dupe_pickle,
strlen(dupe_pickle)) == olm_error()) {
purple_debug_warning("matrixprpl",
"%s: Failed to unpickle %s for %s/%s\n",
__func__, pickle, sender_id, sender_key);
g_free(dupe_pickle);
g_free(session);
continue;
}
g_free(dupe_pickle);
cur_entry = g_new0(MatrixOlmSession, 1);
cur_entry->sender_id = g_strdup(sender_id);
cur_entry->sender_key = g_strdup(sender_key);
cur_entry->session = session;
cur_entry->unique = sqlite3_column_int64(dbstmt, 1);
*chain = cur_entry;
if (!result) {
char *body_double = g_strdup(body);
/* But is this the session we're after ? */
ret = olm_matches_inbound_session(session,
body_double, strlen(body));
g_free(body_double);
if (ret == 1) {
purple_debug_info("matrixprpl",
"%s: Found (loaded) session for %s/%s\n",
__func__, sender_id, sender_key);
result = cur_entry;
/* Carry on loading any other sessions */
}
if (ret == olm_error()) {
purple_debug_warning("matrixprpl",
"%s: Error while checking loaded session %p for "
"match with %s/%s: %s\n", __func__, session,
sender_id, sender_key,
olm_session_last_error(session));
}
if (!ret) {
purple_debug_warning("matrixprpl",
"%s: Loaded session (%" PRIx64
") is not a match for %s/%s\n",
__func__, (int64_t)cur_entry->unique, sender_id,
sender_key);
}
}
}
if (ret != SQLITE_DONE) {
purple_debug_warning("matrixprpl", "%s: db step failed %d\n",
__func__, ret);
goto bad_sql;
}
bad_sql:
sqlite3_finalize(dbstmt);
}
if (list_head && !hash_result) {
MatrixHashKeyOlm *key = g_new0(MatrixHashKeyOlm, 1);
key->sender_key = g_strdup(sender_key);
key->sender_id = g_strdup(sender_id);
/* We loaded entries where there were none before, set the hash */
g_hash_table_insert(conn->e2e->olm_session_hash, key, list_head);
}
return result;
}
/* Save a new olm session into the database */
static MatrixOlmSession *store_olm_session(MatrixConnectionData *conn,
OlmSession *session,
const char *sender_id,
const char *sender_key)
{
MatrixOlmSession *cur_entry = g_new0(MatrixOlmSession, 1);
size_t pickle_len = olm_pickle_session_length(session);
gchar *pickle = g_malloc(pickle_len+1);
sqlite3_stmt *dbstmt = NULL;
pickle_len = olm_pickle_session(session, "!", 1, pickle, pickle_len);
if (pickle_len == olm_error()) {
purple_debug_warning("matrixprpl",
"%s: Failed to pickle session for %s/%s: %s\n",
__func__, sender_id, sender_key,
olm_session_last_error(session));
goto err;
}
pickle[pickle_len] = '\0';
cur_entry->sender_id = g_strdup(sender_id);
cur_entry->sender_key = g_strdup(sender_key);
cur_entry->session = session;
const char *query = "INSERT into olmsessions "
"(sender_name, sender_key, session_pickle) "
"VALUES (?, ?, ?)";
int ret = sqlite3_prepare_v2(conn->e2e->db, query, -1, &dbstmt, NULL);
if (ret != SQLITE_OK || !dbstmt) {
purple_debug_warning("matrixprpl",
"%s: Failed to prep insert %d '%s'\n",
__func__, ret, query);
goto err;
}
ret = sqlite3_bind_text(dbstmt, 1, sender_id, -1, NULL);
if (ret == SQLITE_OK) {
ret = sqlite3_bind_text(dbstmt, 2, sender_key, -1, NULL);
}
if (ret == SQLITE_OK) {
ret = sqlite3_bind_text(dbstmt, 3, pickle, -1, NULL);
}
if (ret != SQLITE_OK) {
purple_debug_warning("matrixprpl",
"%s: Failed to bind %d\n", __func__, ret);
goto err;
}
ret = sqlite3_step(dbstmt);
if (ret != SQLITE_DONE) {
purple_debug_warning("matrixprpl",
"%s: Insert failed %d (%s)\n", __func__,
ret, query);
goto err;
}
sqlite3_finalize(dbstmt);
cur_entry->unique = sqlite3_last_insert_rowid(conn->e2e->db);
MatrixHashKeyOlm match;
match.sender_key = (gchar *)sender_key;
match.sender_id = (gchar *)sender_id;
MatrixOlmSession *hash_result = (MatrixOlmSession *)g_hash_table_lookup(
conn->e2e->olm_session_hash, &match);
if (hash_result) {
/* If there's already an entry, insert it after the head */
cur_entry->next = hash_result->next;
hash_result->next = cur_entry;
} else {
/* No entry, we need to stuff it into the hash table */
MatrixHashKeyOlm *key = g_new0(MatrixHashKeyOlm, 1);
key->sender_key = g_strdup(sender_key);
key->sender_id = g_strdup(sender_id);
/* We loaded entries where there were none before, set the hash */
g_hash_table_insert(conn->e2e->olm_session_hash, key, cur_entry);
}
return cur_entry;
err:
g_free(pickle);
free_matrix_olm_session(cur_entry, FALSE);
return NULL;
}
/* Update an existing OLM session in the database */
static int update_olm_session(MatrixConnectionData *conn,
MatrixOlmSession *mos)
{
size_t pickle_len = olm_pickle_session_length(mos->session);
gchar *pickle = g_malloc(pickle_len+1);
sqlite3_stmt *dbstmt = NULL;
int ret = -1;
pickle_len = olm_pickle_session(mos->session, "!", 1, pickle, pickle_len);
if (pickle_len == olm_error()) {
purple_debug_warning("matrixprpl",
"%s: Failed to pickle session for %s/%s: %s\n",
__func__, mos->sender_id, mos->sender_key,
olm_session_last_error(mos->session));
goto err;
}
pickle[pickle_len] = '\0';
const char *query ="UPDATE olmsessions SET session_pickle=? "
"WHERE sender_name = ? AND sender_key = ? AND "
"ROWID = ?";
ret = sqlite3_prepare_v2(conn->e2e->db, query, -1, &dbstmt, NULL);
if (ret != SQLITE_OK || !dbstmt) {
purple_debug_warning("matrixprpl",
"%s: Failed to prep update %d '%s'\n",
__func__, ret, query);
ret = -1;
goto err;
}
ret = sqlite3_bind_text(dbstmt, 1, pickle, -1, NULL);
if (ret == SQLITE_OK) {
ret = sqlite3_bind_text(dbstmt, 2, mos->sender_id, -1, NULL);
}
if (ret == SQLITE_OK) {
ret = sqlite3_bind_text(dbstmt, 3, mos->sender_key, -1, NULL);
}
if (ret == SQLITE_OK) {
ret = sqlite3_bind_int64(dbstmt, 4, mos->unique);
}
if (ret != SQLITE_OK) {
purple_debug_warning("matrixprpl",
"%s: Failed to bind %d\n", __func__, ret);
ret = -1;
goto err;
}
ret = sqlite3_step(dbstmt);
if (ret != SQLITE_DONE) {
purple_debug_warning("matrixprpl",
"%s: Update failed %d (%s)\n", __func__,
ret, query);
ret = -1;
goto err;
}
ret = 0;
err:
sqlite3_finalize(dbstmt);
g_free(pickle);
return ret;
}
/* Sign the JsonObject with olm_account_sign and add it to the object
* as a 'signatures' member of the top level object.
* 0 on success
*/
int matrix_sign_json(MatrixConnectionData *conn, JsonObject *tosign)
{
int ret = -1;
OlmAccount *account = conn->e2e->oa;
const gchar *device_id = conn->e2e->device_id;
PurpleConnection *pc = conn->pc;
GString *can_json = matrix_canonical_json(tosign);
gchar *can_json_c = g_string_free(can_json, FALSE);
size_t sig_length = olm_account_signature_length(account);
gchar *sig = g_malloc0(sig_length+1);
if (olm_account_sign(account, can_json_c, strlen(can_json_c),
sig, sig_length)==olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(account));
goto out;
}
/* We need to add a "signatures" member which is an object, with
* a "user_id" member that is itself an object which has an "ed25519:$DEVICEID" member
* that is the signature.
*/
GString *alg_dev = g_string_new(NULL);
g_string_printf(alg_dev, "ed25519:%s", device_id);
gchar *alg_dev_c = g_string_free(alg_dev, FALSE);
JsonObject *sig_dev = json_object_new();
json_object_set_string_member(sig_dev, alg_dev_c, sig);
JsonObject *sig_obj = json_object_new();
json_object_set_object_member(sig_obj, conn->user_id, sig_dev);
json_object_set_object_member(tosign, "signatures", sig_obj);
g_free(alg_dev_c);
ret = 0;
out:
g_free(can_json_c);
g_free(sig);
return ret;
}
/* Store the current Olm account data into the Purple account data
*/
static int matrix_store_e2e_account(MatrixConnectionData *conn)
{
PurpleConnection *pc = conn->pc;
size_t pickle_len = olm_pickle_account_length(conn->e2e->oa);
char *pickled_account = g_malloc0(pickle_len+1);
/* TODO: Wth to use as the key? We've not got anything in purple to protect
* it with? We could do with stuffing something into the system key ring
*/
if (olm_pickle_account(conn->e2e->oa, "!", 1, pickled_account, pickle_len) ==
olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(conn->e2e->oa));
g_free(pickled_account);
return -1;
}
/* Create a JSON string to store in our account data, we include
* our device and server as sanity checks.
* TODO: Should we defer this until we've sent it to the server?
*/
JsonObject *settings_body = json_object_new();
json_object_set_string_member(settings_body, "device_id", conn->e2e->device_id);
json_object_set_string_member(settings_body, "server", conn->homeserver);
json_object_set_string_member(settings_body, "pickle", pickled_account);
g_free(pickled_account);
JsonNode *settings_node = json_node_new(JSON_NODE_OBJECT);
json_node_set_object(settings_node, settings_body);
json_object_unref(settings_body);
JsonGenerator *settings_generator = json_generator_new();
json_generator_set_root(settings_generator, settings_node);
gchar *settings_string = json_generator_to_data(settings_generator, NULL);
g_object_unref(G_OBJECT(settings_generator));
json_node_free(settings_node);
purple_account_set_string(pc->account,
PRPL_ACCOUNT_OPT_OLM_ACCOUNT_KEYS, settings_string);
g_free(settings_string);
return 0;
}
/* Retrieve an Olm account from the Purple account data
* Returns: 1 on success
* 0 on no stored account
* -1 on error
*/
static int matrix_restore_e2e_account(MatrixConnectionData *conn)
{
PurpleConnection *pc = conn->pc;
gchar *pickled_account = NULL;
const char *account_string = purple_account_get_string(pc->account,
PRPL_ACCOUNT_OPT_OLM_ACCOUNT_KEYS, NULL);
int ret = -1;
if (!account_string || !*account_string) {
return 0;
}
/* Deal with existing account string */
JsonParser *json_parser = json_parser_new();
const gchar *retrieved_device_id, *retrieved_hs, *retrieved_pickle;
GError *err = NULL;
if (!json_parser_load_from_data(json_parser,
account_string, strlen(account_string),
&err)) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
"Failed to parse stored account key");
purple_debug_info("matrixprpl",
"unable to parse account JSON: %s",
err->message);
g_error_free(err);
g_object_unref(json_parser);
ret = -1;
goto out;
}
JsonNode *settings_node = json_parser_get_root(json_parser);
JsonObject *settings_body = matrix_json_node_get_object(settings_node);
retrieved_device_id = matrix_json_object_get_string_member(settings_body, "device_id");
retrieved_hs = matrix_json_object_get_string_member(settings_body, "server");
retrieved_pickle = matrix_json_object_get_string_member(settings_body, "pickle");
if (!retrieved_device_id || !retrieved_hs || !retrieved_pickle) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
"Unable to retrieve part of the stored account key");
g_object_unref(json_parser);
ret = -1;
goto out;
}
if (strcmp(retrieved_device_id, conn->e2e->device_id) ||
strcmp(retrieved_hs, conn->homeserver)) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
"Device ID/HS doesn't matched for stored account key");
g_object_unref(json_parser);
ret = -1;
goto out;
}
pickled_account = g_strdup(retrieved_pickle);
if (olm_unpickle_account(conn->e2e->oa, "!", 1, pickled_account, strlen(retrieved_pickle)) ==
olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(conn->e2e->oa));
g_object_unref(json_parser);
ret = -1;
goto out;
}
g_object_unref(json_parser);
purple_debug_info("matrixprpl", "Succesfully unpickled account\n");
ret = 1;
out:
g_free(pickled_account);
return ret;
}
/* Returns the list of algorithms and our keys for those algorithms on the current account */
static int get_id_keys(PurpleConnection *pc, OlmAccount *account, gchar ***algorithms, gchar ***keys)
{
/* There has to be an easier way than this.... */
size_t id_key_len = olm_account_identity_keys_length(account);
gchar *id_keys = g_malloc0(id_key_len+1);
if (olm_account_identity_keys(account, id_keys, id_key_len) ==
olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(account));
g_free(id_keys);
return -1;
}
/* We get back a json string, something like:
* {"curve25519":"encodedkey...","ed25519":"encodedkey...."}'
*/
JsonParser *json_parser = json_parser_new();
GError *err = NULL;
if (!json_parser_load_from_data(json_parser,
id_keys, strlen(id_keys), &err)) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
"Failed to parse olm account ID keys");
purple_debug_info("matrixprpl",
"unable to parse olm account ID keys: %s",
err->message);
g_error_free(err);
g_free(id_keys);
g_object_unref(json_parser);
return -1;
}
/* We have one object with a series of string members where
* each member is named after the algorithm.
*/
JsonNode *id_node = json_parser_get_root(json_parser);
JsonObject *id_body = matrix_json_node_get_object(id_node);
guint n_keys = json_object_get_size(id_body);
*algorithms = g_new(gchar *, n_keys);
*keys = g_new(gchar *, n_keys);
JsonObjectIter iter;
const gchar *key_algo;
JsonNode *key_node;
guint i = 0;
json_object_iter_init(&iter, id_body);
while (json_object_iter_next(&iter, &key_algo, &key_node)) {
(*algorithms)[i] = g_strdup(key_algo);
(*keys)[i] = g_strdup(matrix_json_object_get_string_member(id_body, key_algo));
i++;
}
g_free(id_keys);
g_object_unref(json_parser);
return n_keys;
}
/* See: https://matrix.org/docs/guides/e2e_implementation.html#creating-and-registering-one-time-keys */
static int send_one_time_keys(MatrixConnectionData *conn, size_t n_keys)
{
PurpleConnection *pc = conn->pc;
int ret;
size_t random_needed;
void *random_buffer;
void *olm_1t_keys_json = NULL;
JsonParser *json_parser = NULL;
size_t olm_keys_buffer_size;
JsonObject *otk_json = NULL;
random_needed = olm_account_generate_one_time_keys_random_length(
conn->e2e->oa, n_keys);
random_buffer = get_random(random_needed);
if (!random_buffer) {
return -1;
}
if (olm_account_generate_one_time_keys(conn->e2e->oa, n_keys, random_buffer,
random_needed) == olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(conn->e2e->oa));
ret = -1;
goto out;
}
olm_keys_buffer_size = olm_account_one_time_keys_length(conn->e2e->oa);
olm_1t_keys_json = g_malloc0(olm_keys_buffer_size+1);
if (olm_account_one_time_keys(conn->e2e->oa, olm_1t_keys_json,
olm_keys_buffer_size) == olm_error()) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
olm_account_last_error(conn->e2e->oa));
ret = -1;
goto out;
}
/* olm_1t_keys_json has json like:
* {
* curve25519: {
* "keyid1": "base64encodedcurve25519key1",
* "keyid2": "base64encodedcurve25519key2"
* }
* }
* I think in practice this is just curve25519 but I'll avoid hard coding
* We need to produce an object with a set of signed objects each having
* one key
*/
json_parser = json_parser_new();
GError *err = NULL;
if (!json_parser_load_from_data(json_parser,
olm_1t_keys_json, strlen(olm_1t_keys_json), &err)) {
purple_connection_error_reason(pc,
PURPLE_CONNECTION_ERROR_OTHER_ERROR,
"Failed to parse generated 1-time json");
g_error_free(err);
ret = -1;
goto out;
}
/* The output JSON we're generating */
otk_json = json_object_new();
JsonNode *olm_1tk_root = json_parser_get_root(json_parser);
JsonObject *olm_1tk_obj = matrix_json_node_get_object(olm_1tk_root);
JsonObjectIter algo_iter;
json_object_iter_init(&algo_iter, olm_1tk_obj);
const gchar *keys_algo;
JsonNode *keys_node;
while (json_object_iter_next(&algo_iter, &keys_algo, &keys_node)) {
/* We're expecting keys_algo to be "curve25519" and keys_node to be an
* object with a set of keys.
*/
JsonObjectIter keys_iter;
JsonObject *keys_obj = matrix_json_node_get_object(keys_node);
json_object_iter_init(&keys_iter, keys_obj);
const gchar *key_id;
JsonNode *key_node;
while (json_object_iter_next(&keys_iter, &key_id, &key_node)) {
const gchar *key_string = matrix_json_node_get_string(key_node);
JsonObject *signed_key = json_object_new();
json_object_set_string_member(signed_key, "key", key_string);
ret = matrix_sign_json(conn, signed_key);
if (ret) {
g_object_unref(signed_key);
goto out;
}
gchar *signed_key_name = g_strdup_printf("signed_%s:%s", keys_algo,
key_id);
json_object_set_object_member(otk_json,
signed_key_name, signed_key);
g_free(signed_key_name);
}
}
matrix_api_upload_keys(conn, NULL, otk_json,
key_upload_callback,
matrix_api_error, matrix_api_bad_response, (void *)1);
otk_json = NULL; /* matrix_api_upload_keys frees with its json */
ret = 0;
out:
g_object_unref(json_parser);
if (otk_json)
g_object_unref(otk_json);
g_free(random_buffer);
g_free(olm_1t_keys_json);
return ret;
}
/* Called from sync with an object of the form:
* "device_one_time_keys_count" : {
* "signed_curve25519" : 100
* },
*/
void matrix_e2e_handle_sync_key_counts(PurpleConnection *pc, JsonObject *count_object,
gboolean force_send)
{
gboolean need_to_send = force_send;
gboolean valid_counts = FALSE;
MatrixConnectionData *conn = purple_connection_get_protocol_data(pc);
size_t max_keys = olm_account_max_number_of_one_time_keys(conn->e2e->oa);
size_t to_create = max_keys;
if (!force_send) {
JsonObjectIter iter;
const gchar *key_algo;
JsonNode *key_count_node;
json_object_iter_init(&iter, count_object);
while (json_object_iter_next(&iter, &key_algo, &key_count_node)) {
valid_counts = TRUE;
gint64 count = matrix_json_node_get_int(key_count_node);
if (count < max_keys / 2) {
to_create = (max_keys / 2) - count;
need_to_send = TRUE;
}
purple_debug_info("matrixprpl", "%s: %s: %ld\n",
__func__, key_algo, count);
}
}
need_to_send |= !valid_counts;
if (need_to_send) {
purple_debug_info("matrixprpl", "%s: need to send\n",__func__);
send_one_time_keys(conn, to_create);
}
}
/* Called back when we've successfully uploaded the device keys
* we use 'user_data' = 1 to indicate we did an upload of one time
* keys.
*/
static void key_upload_callback(MatrixConnectionData *conn,
gpointer user_data,
struct _JsonNode *json_root,
const char *body,
size_t body_len, const char *content_type)
{
/* The server responds with a count of the one time keys on the server */
JsonObject *top_object = matrix_json_node_get_object(json_root);
JsonObject *key_counts = matrix_json_object_get_object_member(top_object,
"one_time_key_counts");
purple_debug_info("matrixprpl",
"%s: json_root=%p top_object=%p key_counts=%p\n",
__func__, json_root, top_object, key_counts);
/* True if it's a response to a key upload */
if (user_data) {
/* Tell Olm that these one time keys are uploaded */
olm_account_mark_keys_as_published(conn->e2e->oa);
matrix_store_e2e_account(conn);
}
matrix_e2e_handle_sync_key_counts(conn->pc, key_counts, !key_counts);
}
static void close_e2e_db(MatrixConnectionData *conn)
{
sqlite3_close(conn->e2e->db);
conn->e2e->db = NULL;
}
/* 'check' and 'create' are SQL statements; call check, if it returns no result
* then run 'create'.
* typically for checking for the existence of a table and creating it if it didn't