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Init Crypt in StreamConnection Bang Handler

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This commit is contained in:
Florian Märkl 2019-06-27 17:55:07 +02:00
commit 7c8a8bc600
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GPG key ID: 125BC8A5A6A1E857
1 changed files with 32 additions and 22 deletions
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54
lib/src/streamconnection.c
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@ -171,34 +171,13 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_stream_connection_run(ChiakiStreamConnectio
if(err == CHIAKI_ERR_TIMEOUT)
CHIAKI_LOGE(&session->log, "StreamConnection bang receive timeout\n");
CHIAKI_LOGE(&session->log, "StreamConnection didn't receive bang\n");
CHIAKI_LOGE(&session->log, "StreamConnection didn't receive bang or failed to handle it\n");
err = CHIAKI_ERR_UNKNOWN;
goto disconnect;
}
CHIAKI_LOGI(&session->log, "StreamConnection successfully received bang\n");
stream_connection->gkcrypt_local = chiaki_gkcrypt_new(&session->log, 0 /* TODO */, 2, session->handshake_key, stream_connection->ecdh_secret);
if(!stream_connection->gkcrypt_local)
{
CHIAKI_LOGE(&session->log, "StreamConnection failed to initialize GKCrypt with index 2\n");
goto disconnect;
}
stream_connection->gkcrypt_remote = chiaki_gkcrypt_new(&session->log, 0 /* TODO */, 3, session->handshake_key, stream_connection->ecdh_secret);
if(!stream_connection->gkcrypt_remote)
{
CHIAKI_LOGE(&session->log, "StreamConnection failed to initialize GKCrypt with index 3\n");
goto disconnect;
}
// TODO: IMPORTANT!!!
// This all needs to be synchronized correctly!!!
// After receiving the bang, we MUST wait for the gkcrypts to be set before handling any new takion packets!
// Otherwise we might ignore some macs.
// Also, access to the gkcrypts must be synchronized for key_pos and everything.
chiaki_takion_set_crypt(&stream_connection->takion, stream_connection->gkcrypt_local, stream_connection->gkcrypt_remote);
stream_connection->state = STATE_EXPECT_STREAMINFO;
stream_connection->state_finished = false;
stream_connection->state_failed = false;
@ -329,6 +308,30 @@ static void stream_connection_takion_data_idle(ChiakiStreamConnection *stream_co
//chiaki_log_hexdump(stream_connection->log, CHIAKI_LOG_DEBUG, buf, buf_size);
}
static ChiakiErrorCode stream_connection_init_crypt(ChiakiStreamConnection *stream_connection)
{
ChiakiSession *session = stream_connection->session;
stream_connection->gkcrypt_local = chiaki_gkcrypt_new(stream_connection->log, 0 /* TODO */, 2, session->handshake_key, stream_connection->ecdh_secret);
if(!stream_connection->gkcrypt_local)
{
CHIAKI_LOGE(stream_connection->log, "StreamConnection failed to initialize local GKCrypt with index 2\n");
return CHIAKI_ERR_UNKNOWN;
}
stream_connection->gkcrypt_remote = chiaki_gkcrypt_new(stream_connection->log, 0 /* TODO */, 3, session->handshake_key, stream_connection->ecdh_secret);
if(!stream_connection->gkcrypt_remote)
{
CHIAKI_LOGE(stream_connection->log, "StreamConnection failed to initialize remote GKCrypt with index 3\n");
free(stream_connection->gkcrypt_local);
stream_connection->gkcrypt_local = NULL;
return CHIAKI_ERR_UNKNOWN;
}
chiaki_takion_set_crypt(&stream_connection->takion, stream_connection->gkcrypt_local, stream_connection->gkcrypt_remote);
return CHIAKI_ERR_SUCCESS;
}
static void stream_connection_takion_data_expect_bang(ChiakiStreamConnection *stream_connection, uint8_t *buf, size_t buf_size)
{
char ecdh_pub_key[128];
@ -406,6 +409,13 @@ static void stream_connection_takion_data_expect_bang(ChiakiStreamConnection *st
goto error;
}
err = stream_connection_init_crypt(stream_connection);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(stream_connection->log, "StreamConnection failed to init crypt after receiving bang\n");
goto error;
}
// stream_connection->state_mutex is expected to be locked by the caller of this function
stream_connection->state_finished = true;
chiaki_cond_signal(&stream_connection->state_cond);