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d18ec23d0a
profanity/src/xmpp/omemo.c
Paul Fariello c66cd17bbb Fix maybe uninitialized and don't guard g_free
2020-01-20 14:34:09 +01:00

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/*
* omemo.c
* vim: expandtab:ts=4:sts=4:sw=4
*
* Copyright (C) 2019 Paul Fariello <paul@fariello.eu>
*
* This file is part of Profanity.
*
* Profanity 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 3 of the License, or
* (at your option) any later version.
*
* Profanity 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 Profanity. If not, see <https://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give permission to
* link the code of portions of this program with the OpenSSL library under
* certain conditions as described in each individual source file, and
* distribute linked combinations including the two.
*
* You must obey the GNU General Public License in all respects for all of the
* code used other than OpenSSL. If you modify file(s) with this exception, you
* may extend this exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this exception
* statement from your version. If you delete this exception statement from all
* source files in the program, then also delete it here.
*
*/
#include <glib.h>
#include "log.h"
#include "xmpp/connection.h"
#include "xmpp/form.h"
#include "xmpp/iq.h"
#include "xmpp/message.h"
#include "xmpp/stanza.h"
#include "omemo/omemo.h"
static int _omemo_receive_devicelist(xmpp_stanza_t *const stanza, void *const userdata);
static int _omemo_bundle_publish_result(xmpp_stanza_t *const stanza, void *const userdata);
static int _omemo_bundle_publish_configure(xmpp_stanza_t *const stanza, void *const userdata);
static int _omemo_bundle_publish_configure_result(xmpp_stanza_t *const stanza, void *const userdata);
void
omemo_devicelist_subscribe(void)
{
message_pubsub_event_handler_add(STANZA_NS_OMEMO_DEVICELIST, _omemo_receive_devicelist, NULL, NULL);
caps_add_feature(XMPP_FEATURE_OMEMO_DEVICELIST_NOTIFY);
}
void
omemo_devicelist_publish(GList *device_list)
{
xmpp_ctx_t * const ctx = connection_get_ctx();
xmpp_stanza_t *iq = stanza_create_omemo_devicelist_publish(ctx, device_list);
if (connection_supports(XMPP_FEATURE_PUBSUB_PUBLISH_OPTIONS)) {
stanza_attach_publish_options(ctx, iq, "pubsub#access_model", "open");
}
iq_send_stanza(iq);
xmpp_stanza_release(iq);
}
void
omemo_devicelist_request(const char * const jid)
{
xmpp_ctx_t * const ctx = connection_get_ctx();
char *id = connection_create_stanza_id();
xmpp_stanza_t *iq = stanza_create_omemo_devicelist_request(ctx, id, jid);
iq_id_handler_add(id, _omemo_receive_devicelist, NULL, NULL);
iq_send_stanza(iq);
free(id);
xmpp_stanza_release(iq);
}
void
omemo_bundle_publish(gboolean first)
{
xmpp_ctx_t * const ctx = connection_get_ctx();
unsigned char *identity_key = NULL;
size_t identity_key_length;
unsigned char *signed_prekey = NULL;
size_t signed_prekey_length;
unsigned char *signed_prekey_signature = NULL;
size_t signed_prekey_signature_length;
GList *prekeys = NULL, *ids = NULL, *lengths = NULL;
omemo_identity_key(&identity_key, &identity_key_length);
omemo_signed_prekey(&signed_prekey, &signed_prekey_length);
omemo_signed_prekey_signature(&signed_prekey_signature, &signed_prekey_signature_length);
omemo_prekeys(&prekeys, &ids, &lengths);
char *id = connection_create_stanza_id();
xmpp_stanza_t *iq = stanza_create_omemo_bundle_publish(ctx, id,
omemo_device_id(), identity_key, identity_key_length, signed_prekey,
signed_prekey_length, signed_prekey_signature,
signed_prekey_signature_length, prekeys, ids, lengths);
g_list_free_full(prekeys, free);
g_list_free(lengths);
g_list_free(ids);
if (connection_supports(XMPP_FEATURE_PUBSUB_PUBLISH_OPTIONS)) {
stanza_attach_publish_options(ctx, iq, "pubsub#access_model", "open");
}
iq_id_handler_add(id, _omemo_bundle_publish_result, NULL, GINT_TO_POINTER(first));
iq_send_stanza(iq);
xmpp_stanza_release(iq);
free(identity_key);
free(signed_prekey);
free(signed_prekey_signature);
free(id);
}
void
omemo_bundle_request(const char * const jid, uint32_t device_id, ProfIqCallback func, ProfIqFreeCallback free_func, void *userdata)
{
xmpp_ctx_t * const ctx = connection_get_ctx();
char *id = connection_create_stanza_id();
xmpp_stanza_t *iq = stanza_create_omemo_bundle_request(ctx, id, jid, device_id);
iq_id_handler_add(id, func, free_func, userdata);
iq_send_stanza(iq);
free(id);
xmpp_stanza_release(iq);
}
int
omemo_start_device_session_handle_bundle(xmpp_stanza_t *const stanza, void *const userdata)
{
GList *prekeys_list = NULL;
unsigned char *signed_prekey_raw = NULL;
unsigned char *signed_prekey_signature_raw = NULL;
char *from = NULL;
const char *from_attr = xmpp_stanza_get_attribute(stanza, STANZA_ATTR_FROM);
if (!from_attr) {
Jid *jid = jid_create(connection_get_fulljid());
from = strdup(jid->barejid);
jid_destroy(jid);
} else {
from = strdup(from_attr);
}
if (g_strcmp0(from, userdata) != 0) {
goto out;
}
xmpp_stanza_t *pubsub = xmpp_stanza_get_child_by_ns(stanza, STANZA_NS_PUBSUB);
if (!pubsub) {
goto out;
}
xmpp_stanza_t *items = xmpp_stanza_get_child_by_name(pubsub, "items");
if (!items) {
goto out;
}
const char *node = xmpp_stanza_get_attribute(items, "node");
char *device_id_str = strstr(node, ":");
if (!device_id_str) {
goto out;
}
uint32_t device_id = strtoul(++device_id_str, NULL, 10);
xmpp_stanza_t *item = xmpp_stanza_get_child_by_name(items, "item");
if (!item) {
goto out;
}
xmpp_stanza_t *bundle = xmpp_stanza_get_child_by_ns(item, STANZA_NS_OMEMO);
if (!bundle) {
goto out;
}
xmpp_stanza_t *prekeys = xmpp_stanza_get_child_by_name(bundle, "prekeys");
if (!prekeys) {
goto out;
}
xmpp_stanza_t *prekey;
for (prekey = xmpp_stanza_get_children(prekeys); prekey != NULL; prekey = xmpp_stanza_get_next(prekey)) {
if (g_strcmp0(xmpp_stanza_get_name(prekey), "preKeyPublic") != 0) {
continue;
}
omemo_key_t *key = malloc(sizeof(omemo_key_t));
key->data = NULL;
const char *prekey_id_text = xmpp_stanza_get_attribute(prekey, "preKeyId");
if (!prekey_id_text) {
omemo_key_free(key);
continue;
}
key->id = strtoul(prekey_id_text, NULL, 10);
xmpp_stanza_t *prekey_text = xmpp_stanza_get_children(prekey);
if (!prekey_text) {
omemo_key_free(key);
continue;
}
char *prekey_b64 = xmpp_stanza_get_text(prekey_text);
key->data = g_base64_decode(prekey_b64, &key->length);
free(prekey_b64);
if (!key->data) {
omemo_key_free(key);
continue;
}
key->prekey = TRUE;
key->device_id = device_id;
prekeys_list = g_list_append(prekeys_list, key);
}
xmpp_stanza_t *signed_prekey = xmpp_stanza_get_child_by_name(bundle, "signedPreKeyPublic");
if (!signed_prekey) {
goto out;
}
const char *signed_prekey_id_text = xmpp_stanza_get_attribute(signed_prekey, "signedPreKeyId");
if (!signed_prekey_id_text) {
goto out;
}
uint32_t signed_prekey_id = strtoul(signed_prekey_id_text, NULL, 10);
xmpp_stanza_t *signed_prekey_text = xmpp_stanza_get_children(signed_prekey);
if (!signed_prekey_text) {
goto out;
}
size_t signed_prekey_len;
char *signed_prekey_b64 = xmpp_stanza_get_text(signed_prekey_text);
signed_prekey_raw = g_base64_decode(signed_prekey_b64, &signed_prekey_len);
free(signed_prekey_b64);
if (!signed_prekey_raw) {
goto out;
}
xmpp_stanza_t *signed_prekey_signature = xmpp_stanza_get_child_by_name(bundle, "signedPreKeySignature");
if (!signed_prekey_signature) {
goto out;
}
xmpp_stanza_t *signed_prekey_signature_text = xmpp_stanza_get_children(signed_prekey_signature);
if (!signed_prekey_signature_text) {
goto out;
}
size_t signed_prekey_signature_len;
char *signed_prekey_signature_b64 = xmpp_stanza_get_text(signed_prekey_signature_text);
signed_prekey_signature_raw = g_base64_decode(signed_prekey_signature_b64, &signed_prekey_signature_len);
free(signed_prekey_signature_b64);
if (!signed_prekey_signature_raw) {
goto out;
}
xmpp_stanza_t *identity_key = xmpp_stanza_get_child_by_name(bundle, "identityKey");
if (!identity_key) {
goto out;
}
xmpp_stanza_t *identity_key_text = xmpp_stanza_get_children(identity_key);
if (!identity_key_text) {
goto out;
}
size_t identity_key_len;
char *identity_key_b64 = xmpp_stanza_get_text(identity_key_text);
unsigned char *identity_key_raw = g_base64_decode(identity_key_b64, &identity_key_len);
free(identity_key_b64);
if (!identity_key_raw) {
goto out;
}
omemo_start_device_session(from, device_id, prekeys_list, signed_prekey_id,
signed_prekey_raw, signed_prekey_len, signed_prekey_signature_raw,
signed_prekey_signature_len, identity_key_raw, identity_key_len);
g_free(identity_key_raw);
out:
free(from);
if (signed_prekey_raw) {
g_free(signed_prekey_raw);
}
if (signed_prekey_signature_raw) {
g_free(signed_prekey_signature_raw);
}
if (prekeys_list) {
g_list_free_full(prekeys_list, (GDestroyNotify)omemo_key_free);
}
return 1;
}
char *
omemo_receive_message(xmpp_stanza_t *const stanza, gboolean *trusted)
{
char *plaintext = NULL;
const char *type = xmpp_stanza_get_type(stanza);
GList *keys = NULL;
unsigned char *iv_raw = NULL;
unsigned char *payload_raw = NULL;
char *iv_text = NULL;
char *payload_text = NULL;
xmpp_stanza_t *encrypted = xmpp_stanza_get_child_by_ns(stanza, STANZA_NS_OMEMO);
if (!encrypted) {
return NULL;
}
xmpp_stanza_t *header = xmpp_stanza_get_child_by_name(encrypted, "header");
if (!header) {
return NULL;
}
const char *sid_text = xmpp_stanza_get_attribute(header, "sid");
if (!sid_text) {
return NULL;
}
uint32_t sid = strtoul(sid_text, NULL, 10);
xmpp_stanza_t *iv = xmpp_stanza_get_child_by_name(header, "iv");
if (!iv) {
return NULL;
}
iv_text = xmpp_stanza_get_text(iv);
if (!iv_text) {
return NULL;
}
size_t iv_len;
iv_raw = g_base64_decode(iv_text, &iv_len);
if (!iv_raw) {
goto out;
}
xmpp_stanza_t *payload = xmpp_stanza_get_child_by_name(encrypted, "payload");
if (!payload) {
goto out;
}
payload_text = xmpp_stanza_get_text(payload);
if (!payload_text) {
goto out;
}
size_t payload_len;
payload_raw = g_base64_decode(payload_text, &payload_len);
if (!payload_raw) {
goto out;
}
xmpp_stanza_t *key_stanza;
for (key_stanza = xmpp_stanza_get_children(header); key_stanza != NULL; key_stanza = xmpp_stanza_get_next(key_stanza)) {
if (g_strcmp0(xmpp_stanza_get_name(key_stanza), "key") != 0) {
continue;
}
omemo_key_t *key = malloc(sizeof(omemo_key_t));
char *key_text = xmpp_stanza_get_text(key_stanza);
if (!key_text) {
goto skip;
}
const char *rid_text = xmpp_stanza_get_attribute(key_stanza, "rid");
key->device_id = strtoul(rid_text, NULL, 10);
if (!key->device_id) {
goto skip;
}
key->data = g_base64_decode(key_text, &key->length);
free(key_text);
if (!key->data) {
goto skip;
}
key->prekey =
g_strcmp0(xmpp_stanza_get_attribute(key_stanza, "prekey"), "true") == 0
|| g_strcmp0(xmpp_stanza_get_attribute(key_stanza, "prekey"), "1") == 0;
keys = g_list_append(keys, key);
continue;
skip:
free(key);
}
const char *from = xmpp_stanza_get_from(stanza);
plaintext = omemo_on_message_recv(from, sid, iv_raw, iv_len,
keys, payload_raw, payload_len,
g_strcmp0(type, STANZA_TYPE_GROUPCHAT) == 0, trusted);
out:
if (keys) {
g_list_free_full(keys, (GDestroyNotify)omemo_key_free);
}
g_free(iv_raw);
g_free(payload_raw);
g_free(iv_text);
g_free(payload_text);
return plaintext;
}
static int
_omemo_receive_devicelist(xmpp_stanza_t *const stanza, void *const userdata)
{
GList *device_list = NULL;
const char *from = xmpp_stanza_get_attribute(stanza, STANZA_ATTR_FROM);
xmpp_stanza_t *root = NULL;
xmpp_stanza_t *event = xmpp_stanza_get_child_by_ns(stanza, STANZA_NS_PUBSUB_EVENT);
if (event) {
root = event;
}
xmpp_stanza_t *pubsub = xmpp_stanza_get_child_by_ns(stanza, STANZA_NS_PUBSUB);
if (pubsub) {
root = pubsub;
}
if (!root) {
return 1;
}
xmpp_stanza_t *items = xmpp_stanza_get_child_by_name(root, "items");
if (!items) {
return 1;
}
xmpp_stanza_t *item = xmpp_stanza_get_child_by_name(items, "item");
if (item) {
xmpp_stanza_t *list = xmpp_stanza_get_child_by_ns(item, STANZA_NS_OMEMO);
if (!list) {
return 1;
}
xmpp_stanza_t *device;
for (device = xmpp_stanza_get_children(list); device != NULL; device = xmpp_stanza_get_next(device)) {
if (g_strcmp0(xmpp_stanza_get_name(device), "device") != 0) {
continue;
}
const char *id = xmpp_stanza_get_id(device);
if (id != NULL) {
device_list = g_list_append(device_list, GINT_TO_POINTER(strtoul(id, NULL, 10)));
} else {
log_error("OMEMO: received device without ID");
}
}
}
omemo_set_device_list(from, device_list);
return 1;
}
static int
_omemo_bundle_publish_result(xmpp_stanza_t *const stanza, void *const userdata)
{
const char *type = xmpp_stanza_get_type(stanza);
if (g_strcmp0(type, STANZA_TYPE_ERROR) != 0) {
return 0;
}
if (!GPOINTER_TO_INT(userdata)) {
log_error("OMEMO: definitely cannot publish bundle with an open access model");
return 0;
}
log_info("OMEMO: cannot publish bundle with open access model, trying to configure node");
xmpp_ctx_t * const ctx = connection_get_ctx();
Jid *jid = jid_create(connection_get_fulljid());
char *id = connection_create_stanza_id();
char *node = g_strdup_printf("%s:%d", STANZA_NS_OMEMO_BUNDLES, omemo_device_id());
xmpp_stanza_t *iq = stanza_create_pubsub_configure_request(ctx, id, jid->barejid, node);
g_free(node);
iq_id_handler_add(id, _omemo_bundle_publish_configure, NULL, userdata);
iq_send_stanza(iq);
xmpp_stanza_release(iq);
free(id);
jid_destroy(jid);
return 0;
}
static int
_omemo_bundle_publish_configure(xmpp_stanza_t *const stanza, void *const userdata)
{
/* TODO handle error */
xmpp_stanza_t *pubsub = xmpp_stanza_get_child_by_name(stanza, "pubsub");
xmpp_stanza_t *configure = xmpp_stanza_get_child_by_name(pubsub, STANZA_NAME_CONFIGURE);
xmpp_stanza_t *x = xmpp_stanza_get_child_by_name(configure, "x");
DataForm* form = form_create(x);
char *tag = g_hash_table_lookup(form->var_to_tag, "pubsub#access_model");
if (!tag) {
log_info("OMEMO: cannot configure bundle to an open access model");
return 0;
}
form_set_value(form, tag, "open");
xmpp_ctx_t * const ctx = connection_get_ctx();
Jid *jid = jid_create(connection_get_fulljid());
char *id = connection_create_stanza_id();
char *node = g_strdup_printf("%s:%d", STANZA_NS_OMEMO_BUNDLES, omemo_device_id());
xmpp_stanza_t *iq = stanza_create_pubsub_configure_submit(ctx, id, jid->barejid, node, form);
g_free(node);
iq_id_handler_add(id, _omemo_bundle_publish_configure_result, NULL, userdata);
iq_send_stanza(iq);
xmpp_stanza_release(iq);
free(id);
jid_destroy(jid);
return 0;
}
static int
_omemo_bundle_publish_configure_result(xmpp_stanza_t *const stanza, void *const userdata)
{
const char *type = xmpp_stanza_get_type(stanza);
if (g_strcmp0(type, STANZA_TYPE_ERROR) == 0) {
log_error("OMEMO: cannot configure bundle to an open access model");
return 0;
}
omemo_bundle_publish(TRUE);
return 0;
}
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