/*----------------------------------------------------------------------------*/
zrtp_status_t zrtp_init_rng(zrtp_global_t* zrtp)
{
if (!zrtp->rand_initialized) {
zrtp_mutex_init(&zrtp->rng_protector);
MD_Init(&zrtp->rand_ctx);
#if (ZRTP_PLATFORM == ZP_WIN32) || (ZRTP_PLATFORM == ZP_WIN64) || (ZRTP_PLATFORM == ZP_WINCE)
if (zrtp_status_ok != NtLmInitializeRNG()) {
ZRTP_LOG(1,(_ZTU_,"\tERROR! during CryptAcquireContext!\n"));
return zrtp_status_fail;
}
#endif
zrtp->rand_initialized = 1;
}
return zrtp_status_ok;
}
/*----------------------------------------------------------------------------*/
zrtp_status_t zrtp_stream_attach(zrtp_session_t *session, zrtp_stream_t** stream)
{
uint32_t i = 0;
zrtp_status_t s = zrtp_status_fail;
zrtp_stream_t* new_stream = NULL;
ZRTP_LOG(3, (_ZTU_,"ATTACH NEW STREAM to sID=%d:\n", session->id));
/*
* Initialize first unused stream. If there are no available streams return error.
*/
zrtp_mutex_lock(session->streams_protector);
for (i=0; i<ZRTP_MAX_STREAMS_PER_SESSION; i++) {
if (ZRTP_STATE_NONE == session->streams[i].state) {
new_stream = &session->streams[i];
zrtp_memset(new_stream, 0, sizeof(zrtp_stream_t));
break;
}
}
zrtp_mutex_unlock(session->streams_protector);
if (!new_stream) {
ZRTP_LOG(1, (_ZTU_,"\tWARNING! Can't attach one more stream. Limit is reached."
" Use #ZRTP_MAX_STREAMS_PER_SESSION. sID=%u\n", session->id));
return zrtp_status_alloc_fail;
}
/*
* Initialize the private data stream with default initial values
*/
zrtp_mutex_init(&new_stream->stream_protector);
_zrtp_change_state(new_stream, ZRTP_STATE_ACTIVE);
new_stream->mode = ZRTP_STREAM_MODE_CLEAR;
new_stream->id = session->zrtp->streams_count++;
new_stream->session = session;
new_stream->zrtp = session->zrtp;
new_stream->mitm_mode = ZRTP_MITM_MODE_UNKN;
new_stream->is_hello_received = 0;
ZSTR_SET_EMPTY(new_stream->cc.hmackey);
ZSTR_SET_EMPTY(new_stream->cc.peer_hmackey);
ZSTR_SET_EMPTY(new_stream->cc.zrtp_key);
ZSTR_SET_EMPTY(new_stream->cc.peer_zrtp_key);
new_stream->dh_cc.initialized_with = ZRTP_COMP_UNKN;
bnBegin(&new_stream->dh_cc.peer_pv);
ZSTR_SET_EMPTY(new_stream->dh_cc.dhss);
ZRTP_LOG(3, (_ZTU_,"\tEmpty slot was found - initializing new stream with ID=%u.\n", new_stream->id));
do {
zrtp_string32_t hash_buff = ZSTR_INIT_EMPTY(hash_buff);
zrtp_hash_t *hash = zrtp_comp_find(ZRTP_CC_HASH, ZRTP_HASH_SHA256, new_stream->zrtp);
s = zrtp_status_algo_fail;
if (sizeof(uint16_t) != zrtp_randstr( new_stream->zrtp,
(uint8_t*)&new_stream->media_ctx.high_out_zrtp_seq,
sizeof(uint16_t))) {
break;
}
/*
* Compute and store message hashes to prevent DoS attacks.
* Generate H0 as a random nonce and compute H1, H2 and H3
* using the leftmost 128 bits from every hash.
* Then insert these directly into the message structures.
*/
zrtp_memset(&new_stream->messages, 0, sizeof(new_stream->messages));
ZSTR_SET_EMPTY(new_stream->messages.h0);
ZSTR_SET_EMPTY(new_stream->messages.signaling_hash);
/* Generate Random nonce, compute H1 and store in the DH packet */
new_stream->messages.h0.length = (uint16_t)zrtp_randstr( new_stream->zrtp,
(unsigned char*)new_stream->messages.h0.buffer,
ZRTP_MESSAGE_HASH_SIZE);
if (ZRTP_MESSAGE_HASH_SIZE != new_stream->messages.h0.length) {
break;
}
s = hash->hash(hash, ZSTR_GV(new_stream->messages.h0), ZSTR_GV(hash_buff));
if (zrtp_status_ok != s) {
break;
}
zrtp_memcpy(new_stream->messages.dhpart.hash, hash_buff.buffer, ZRTP_MESSAGE_HASH_SIZE);
/* Compute H2 for the Commit */
s = hash->hash_c(hash, (char*)new_stream->messages.dhpart.hash, ZRTP_MESSAGE_HASH_SIZE, ZSTR_GV(hash_buff));
if (zrtp_status_ok != s) {
break;
}
zrtp_memcpy(new_stream->messages.commit.hash, hash_buff.buffer, ZRTP_MESSAGE_HASH_SIZE);
/* Compute H3 for the Hello message */
s = hash->hash_c(hash, (char*)new_stream->messages.commit.hash, ZRTP_MESSAGE_HASH_SIZE, ZSTR_GV(hash_buff));
if (zrtp_status_ok != s) {
break;
}
zrtp_memcpy(new_stream->messages.hello.hash, hash_buff.buffer, ZRTP_MESSAGE_HASH_SIZE);
s = zrtp_status_ok;
} while (0);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"\tERROR! Fail to compute messages hashes <%s>.\n", zrtp_log_status2str(s)));
return s;
}
/*
* Preparing HELLO based on user's profile
*/
ZRTP_LOG(3, (_ZTU_,"\tPreparing ZRTP Hello according to the Session profile.\n"));
{
zrtp_packet_Hello_t* hello = &new_stream->messages.hello;
uint8_t i = 0;
int8_t* comp_ptr = NULL;
/* Set Protocol Version and ClientID */
zrtp_memcpy(hello->version, ZRTP_PROTOCOL_VERSION, ZRTP_VERSION_SIZE);
zrtp_memcpy(hello->cliend_id, session->zrtp->client_id.buffer, session->zrtp->client_id.length);
/* Set flags. */
hello->pasive = (ZRTP_LICENSE_MODE_PASSIVE == session->zrtp->lic_mode) ? 1 : 0;
hello->uflag = (ZRTP_LICENSE_MODE_UNLIMITED == session->zrtp->lic_mode) ? 1 : 0;
hello->mitmflag = session->zrtp->is_mitm;
hello->sigflag = 0;
zrtp_memcpy(hello->zid, session->zid.buffer, session->zid.length);
comp_ptr = (int8_t*)hello->comp;
i = 0;
while ( session->profile.hash_schemes[i]) {
zrtp_memcpy( comp_ptr,
zrtp_comp_id2type(ZRTP_CC_HASH, session->profile.hash_schemes[i++]),
ZRTP_COMP_TYPE_SIZE );
comp_ptr += ZRTP_COMP_TYPE_SIZE;
}
hello->hc = i;
i = 0;
while (session->profile.cipher_types[i]) {
zrtp_memcpy( comp_ptr,
zrtp_comp_id2type(ZRTP_CC_CIPHER, session->profile.cipher_types[i++]),
ZRTP_COMP_TYPE_SIZE );
comp_ptr += ZRTP_COMP_TYPE_SIZE;
}
hello->cc = i;
i = 0;
while (session->profile.auth_tag_lens[i] ) {
zrtp_memcpy( comp_ptr,
zrtp_comp_id2type(ZRTP_CC_ATL, session->profile.auth_tag_lens[i++]),
ZRTP_COMP_TYPE_SIZE );
comp_ptr += ZRTP_COMP_TYPE_SIZE;
}
hello->ac = i;
i = 0;
while (session->profile.pk_schemes[i] ) {
zrtp_memcpy( comp_ptr,
zrtp_comp_id2type(ZRTP_CC_PKT, session->profile.pk_schemes[i++]),
ZRTP_COMP_TYPE_SIZE );
comp_ptr += ZRTP_COMP_TYPE_SIZE;
}
hello->kc = i;
i = 0;
while (session->profile.sas_schemes[i]) {
zrtp_memcpy( comp_ptr,
zrtp_comp_id2type(ZRTP_CC_SAS, session->profile.sas_schemes[i++]),
ZRTP_COMP_TYPE_SIZE );
comp_ptr += ZRTP_COMP_TYPE_SIZE;
}
hello->sc = i;
/*
* Hmac will appear at the end of the message, after the dynamic portion.
* i is the length of the dynamic part.
*/
i = (hello->hc + hello->cc + hello->ac + hello->kc + hello->sc) * ZRTP_COMP_TYPE_SIZE;
_zrtp_packet_fill_msg_hdr( new_stream,
ZRTP_HELLO,
ZRTP_HELLO_STATIC_SIZE + i + ZRTP_HMAC_SIZE,
&hello->hdr);
}
*stream = new_stream;
ZRTP_LOG(3, (_ZTU_,"ATTACH NEW STREAM - DONE.\n"));
return zrtp_status_ok;
}
zrtp_status_t zrtp_init(zrtp_config_t* config, zrtp_global_t** zrtp)
{
zrtp_global_t* new_zrtp;
zrtp_status_t s = zrtp_status_ok;
ZRTP_LOG(3, (_ZTU_,"INITIALIZING LIBZRTP...\n"));
/* Print out configuration setting */
zrtp_print_env_settings(config);
new_zrtp = zrtp_sys_alloc(sizeof(zrtp_global_t));
if (!new_zrtp) {
return zrtp_status_alloc_fail;
}
zrtp_memset(new_zrtp, 0, sizeof(zrtp_global_t));
/*
* Apply configuration according to the config
*/
new_zrtp->lic_mode = config->lic_mode;
new_zrtp->is_mitm = config->is_mitm;
ZSTR_SET_EMPTY(new_zrtp->def_cache_path);
zrtp_zstrcpy(ZSTR_GV(new_zrtp->def_cache_path), ZSTR_GV(config->def_cache_path));
zrtp_memcpy(&new_zrtp->cb, &config->cb, sizeof(zrtp_callback_t));
new_zrtp->cache_auto_store = config->cache_auto_store;
ZSTR_SET_EMPTY(new_zrtp->client_id);
zrtp_memset(new_zrtp->client_id.buffer, ' ', sizeof(zrtp_client_id_t));
zrtp_zstrncpyc( ZSTR_GV(new_zrtp->client_id),
(const char*)config->client_id,
sizeof(zrtp_client_id_t));
/*
* General Initialization
*/
init_mlist(&new_zrtp->sessions_head);
zrtp_mutex_init(&new_zrtp->sessions_protector);
init_mlist(&new_zrtp->hash_head);
init_mlist(&new_zrtp->cipher_head);
init_mlist(&new_zrtp->atl_head);
init_mlist(&new_zrtp->pktype_head);
init_mlist(&new_zrtp->sas_head);
/* Init RNG context */
s = zrtp_init_rng(new_zrtp);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! zrtp_init_rng() failed:%s.\n", zrtp_log_status2str(s)));
return zrtp_status_rng_fail;
}
/* Initialize SRTP engine */
s = zrtp_srtp_init(new_zrtp);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! zrtp_srtp_init() failed:<%s>\n", zrtp_log_status2str(s)));
return zrtp_status_fail;
}
if (new_zrtp->cb.cache_cb.on_init) {
s = new_zrtp->cb.cache_cb.on_init(new_zrtp);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! cache on_init() callback failed <%s>\n", zrtp_log_status2str(s)));
zrtp_srtp_down(new_zrtp);
return zrtp_status_fail;
}
}
if (new_zrtp->cb.sched_cb.on_init) {
s = new_zrtp->cb.sched_cb.on_init(new_zrtp);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! scheduler on_init() callback failed <%s>\n", zrtp_log_status2str(s)));
zrtp_srtp_down(new_zrtp);
return zrtp_status_fail;
}
}
/* Load default crypto-components */
zrtp_prepare_pkt(new_zrtp);
zrtp_defaults_sas(new_zrtp);
zrtp_defaults_pkt(new_zrtp);
zrtp_defaults_atl(new_zrtp);
zrtp_defaults_aes_cipher(new_zrtp);
zrtp_defaults_hash(new_zrtp);
*zrtp = new_zrtp;
ZRTP_LOG(3, (_ZTU_,"INITIALIZING LIBZRTP - DONE\n"));
return s;
}
/*----------------------------------------------------------------------------*/
zrtp_status_t zrtp_session_init( zrtp_global_t* zrtp,
zrtp_profile_t* profile,
zrtp_zid_t zid,
zrtp_signaling_role_t role,
zrtp_session_t **session)
{
uint32_t i = 0;
zrtp_status_t s = zrtp_status_fail;
zrtp_session_t* new_session = NULL;
if (!zrtp) {
return zrtp_status_bad_param;
}
new_session = zrtp_sys_alloc(sizeof(zrtp_session_t));
if (!new_session) {
return zrtp_status_alloc_fail;
}
zrtp_memset(new_session, 0, sizeof(zrtp_session_t));
new_session->id = zrtp->sessions_count++;
{
zrtp_uchar32_t buff;
ZRTP_LOG(3, (_ZTU_,"START SESSION INITIALIZATION. sID=%u.\n", new_session->id));
ZRTP_LOG(3, (_ZTU_,"ZID=%s.\n", hex2str((const char*)zid, sizeof(zrtp_uchar12_t), (char*)buff, sizeof(buff)) ));
}
do {
/*
* Apply profile for the stream context: set flags and prepare Hello packet.
* If profile structure isn't provided, generate default.
*/
if (!profile) {
ZRTP_LOG(1, (_ZTU_,"Profile in NULL - loading default one.\n"));
zrtp_profile_defaults(&new_session->profile, zrtp);
} else {
ZRTP_LOG(1, (_ZTU_,"Loading User's profile:\n"));
if (zrtp_status_ok != zrtp_profile_check(profile, zrtp)) {
ZRTP_LOG(1, (_ZTU_,"ERROR! Can't apply wrong profile to the session sID=%u.\n", new_session->id));
break;
}
/* Adjust user's settings: force SHA-384 hash for ECDH-384P */
if (zrtp_profile_find(profile, ZRTP_CC_PKT, ZRTP_PKTYPE_EC384P) > 0) {
ZRTP_LOG(3, (_ZTU_,"User wants ECDH384 - auto-adjust profile to use SHA-384.\n"));
profile->hash_schemes[0] = ZRTP_HASH_SHA384;
profile->hash_schemes[1] = ZRTP_HASH_SHA256;
profile->hash_schemes[2] = 0;
}
zrtp_memcpy(&new_session->profile, profile, sizeof(zrtp_profile_t));
{
int i;
ZRTP_LOG(3, (_ZTU_," allowclear: %s\n", profile->allowclear?"ON":"OFF"));
ZRTP_LOG(3, (_ZTU_," autosecure: %s\n", profile->autosecure?"ON":"OFF"));
ZRTP_LOG(3, (_ZTU_," disclose_bit: %s\n", profile->disclose_bit?"ON":"OFF"));
ZRTP_LOG(3, (_ZTU_," signal. role: %s\n", zrtp_log_sign_role2str(role)));
ZRTP_LOG(3, (_ZTU_," TTL: %u\n", profile->cache_ttl));
ZRTP_LOG(3, (_ZTU_," SAS schemes: "));
i=0;
while (profile->sas_schemes[i]) {
ZRTP_LOGC(3, ("%.4s ", zrtp_comp_id2type(ZRTP_CC_SAS, profile->sas_schemes[i++])));
}
ZRTP_LOGC(3, ("\n")); ZRTP_LOG(1, (_ZTU_," Ciphers: "));
i=0;
while (profile->cipher_types[i]) {
ZRTP_LOGC(3, ("%.4s ", zrtp_comp_id2type(ZRTP_CC_CIPHER, profile->cipher_types[i++])));
}
ZRTP_LOGC(3, ("\n")); ZRTP_LOG(1, (_ZTU_," PK schemes: "));
i=0;
while (profile->pk_schemes[i]) {
ZRTP_LOGC(3, ("%.4s ", zrtp_comp_id2type(ZRTP_CC_PKT, profile->pk_schemes[i++])));
}
ZRTP_LOGC(3, ("\n")); ZRTP_LOG(1, (_ZTU_," ATL: "));
i=0;
while (profile->auth_tag_lens[i]) {
ZRTP_LOGC(3, ("%.4s ", zrtp_comp_id2type(ZRTP_CC_ATL, profile->auth_tag_lens[i++])));
}
ZRTP_LOGC(3, ("\n")); ZRTP_LOG(1, (_ZTU_," Hashes: "));
i=0;
while (profile->hash_schemes[i]) {
ZRTP_LOGC(3, ("%.4s ", zrtp_comp_id2type(ZRTP_CC_HASH, profile->hash_schemes[i++])));
}
ZRTP_LOGC(3, ("\n"));
}
}
/* Set ZIDs */
ZSTR_SET_EMPTY(new_session->zid);
ZSTR_SET_EMPTY(new_session->peer_zid);
zrtp_zstrncpyc(ZSTR_GV(new_session->zid), (const char*)zid, sizeof(zrtp_zid_t));
new_session->zrtp = zrtp;
new_session->signaling_role = role;
new_session->mitm_alert_detected = 0;
/*
* Allocate memory for holding secrets and initialize with random values.
* Actual values will be written from the cache at the beginning of the protocol.
*/
new_session->secrets.rs1 = _zrtp_alloc_shared_secret(new_session);
new_session->secrets.rs2 = _zrtp_alloc_shared_secret(new_session);
new_session->secrets.auxs = _zrtp_alloc_shared_secret(new_session);
new_session->secrets.pbxs = _zrtp_alloc_shared_secret(new_session);
if ( !new_session->secrets.rs1 || !new_session->secrets.rs2 ||
!new_session->secrets.auxs || !new_session->secrets.pbxs) {
ZRTP_LOG(1, (_ZTU_,"ERROR! Can't allocate shared secrets sID=%u\n.", new_session->id));
s = zrtp_status_alloc_fail;
break;
}
/* Initialize SAS values */
ZSTR_SET_EMPTY(new_session->sas1);
ZSTR_SET_EMPTY(new_session->sas2);
ZSTR_SET_EMPTY(new_session->sasbin);
ZSTR_SET_EMPTY(new_session->zrtpsess);
/* Clear all stream structures */
for (i=0; i<ZRTP_MAX_STREAMS_PER_SESSION ; i++) {
new_session->streams[i].state = ZRTP_STATE_NONE;
new_session->streams[i].prev_state = ZRTP_STATE_NONE;
new_session->streams[i].mode = ZRTP_STREAM_MODE_UNKN;
}
/* Initialize synchronization objects */
s = zrtp_mutex_init(&new_session->streams_protector);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! can't initialize Stream protector. sID=%u.\n", new_session->id));
break;
}
s = zrtp_mutex_init(&new_session->init_protector);
if (zrtp_status_ok != s) {
ZRTP_LOG(1, (_ZTU_,"ERROR! can't initialize Init protector. sID=%u.\n", new_session->id));
break;
}
s = zrtp_status_ok;
} while (0);
if (zrtp_status_ok != s) {
zrtp_sys_free(new_session);
return s;
}
/* Add new session to the global list */
zrtp_mutex_lock(zrtp->sessions_protector);
mlist_add(&zrtp->sessions_head, &new_session->_mlist);
zrtp_mutex_unlock(zrtp->sessions_protector);
*session = new_session;
ZRTP_LOG(3, (_ZTU_,"Session initialization - DONE. sID=%u.\n\n", new_session->id));
return zrtp_status_ok;
}
