static void janus_dtls_srtp_free(const janus_refcount *dtls_ref) {
janus_dtls_srtp *dtls = janus_refcount_containerof(dtls_ref, janus_dtls_srtp, ref);
/* This stack can be destroyed, free all the resources */
dtls->component = NULL;
if(dtls->ssl != NULL) {
SSL_free(dtls->ssl);
dtls->ssl = NULL;
}
/* BIOs are destroyed by SSL_free */
dtls->read_bio = NULL;
dtls->write_bio = NULL;
dtls->filter_bio = NULL;
if(dtls->srtp_valid) {
if(dtls->srtp_in) {
srtp_dealloc(dtls->srtp_in);
dtls->srtp_in = NULL;
}
if(dtls->srtp_out) {
srtp_dealloc(dtls->srtp_out);
dtls->srtp_out = NULL;
}
/* FIXME What about dtls->remote_policy and dtls->local_policy? */
}
g_free(dtls);
dtls = NULL;
}
void janus_dtls_srtp_destroy(janus_dtls_srtp *dtls) {
if(dtls == NULL)
return;
#ifdef HAVE_SCTP
/* Destroy the SCTP association if this is a DataChannel */
if(dtls->sctp != NULL) {
janus_sctp_association_destroy(dtls->sctp);
dtls->sctp = NULL;
}
#endif
/* Destroy DTLS stack and free resources */
dtls->component = NULL;
if(dtls->ssl != NULL) {
SSL_free(dtls->ssl);
dtls->ssl = NULL;
}
/* BIOs are destroyed by SSL_free */
dtls->read_bio = NULL;
dtls->write_bio = NULL;
dtls->filter_bio = NULL;
if(dtls->srtp_valid) {
if(dtls->srtp_in) {
srtp_dealloc(dtls->srtp_in);
dtls->srtp_in = NULL;
}
if(dtls->srtp_out) {
srtp_dealloc(dtls->srtp_out);
dtls->srtp_out = NULL;
}
/* FIXME What about dtls->remote_policy and dtls->local_policy? */
}
g_free(dtls);
dtls = NULL;
}
/*
* Stop SRTP session.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_stop(pjmedia_transport *srtp)
{
transport_srtp *p_srtp = (transport_srtp*) srtp;
err_status_t err;
PJ_ASSERT_RETURN(srtp, PJ_EINVAL);
if (!p_srtp->session_inited)
return PJ_SUCCESS;
err = srtp_dealloc(p_srtp->srtp_rx_ctx);
if (err != err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc RX SRTP context: %s",
get_libsrtp_errstr(err)));
}
err = srtp_dealloc(p_srtp->srtp_tx_ctx);
if (err != err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc TX SRTP context: %s",
get_libsrtp_errstr(err)));
}
p_srtp->session_inited = PJ_FALSE;
return PJ_SUCCESS;
}
/*
* Stop SRTP session.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_stop(pjmedia_transport *srtp)
{
transport_srtp *p_srtp = (transport_srtp*) srtp;
err_status_t err;
PJ_ASSERT_RETURN(srtp, PJ_EINVAL);
pj_lock_acquire(p_srtp->mutex);
if (!p_srtp->session_inited) {
pj_lock_release(p_srtp->mutex);
return PJ_SUCCESS;
}
err = srtp_dealloc(p_srtp->srtp_rx_ctx);
if (err != err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc RX SRTP context: %s",
get_libsrtp_errstr(err)));
}
err = srtp_dealloc(p_srtp->srtp_tx_ctx);
if (err != err_status_ok) {
PJ_LOG(4, (p_srtp->pool->obj_name,
"Failed to dealloc TX SRTP context: %s",
get_libsrtp_errstr(err)));
}
p_srtp->session_inited = PJ_FALSE;
pj_bzero(&p_srtp->rx_policy, sizeof(p_srtp->rx_policy));
pj_bzero(&p_srtp->tx_policy, sizeof(p_srtp->tx_policy));
pj_lock_release(p_srtp->mutex);
return PJ_SUCCESS;
}
void janus_dtls_srtp_destroy(janus_dtls_srtp *dtls) {
if(dtls == NULL)
return;
/* Destroy DTLS stack and free resources */
dtls->component = NULL;
if(dtls->ssl != NULL) {
SSL_free(dtls->ssl);
dtls->ssl = NULL;
}
/* BIOs are destroyed by SSL_free */
dtls->read_bio = NULL;
dtls->write_bio = NULL;
if(dtls->srtp_valid) {
if(dtls->remote_policy.key != NULL) {
g_free(dtls->remote_policy.key);
dtls->remote_policy.key = NULL;
}
if(dtls->local_policy.key != NULL) {
g_free(dtls->local_policy.key);
dtls->local_policy.key = NULL;
}
srtp_dealloc(dtls->srtp_in);
srtp_dealloc(dtls->srtp_out);
/* FIXME What about dtls->remote_policy and dtls->local_policy? */
}
if(dtls->dtls_last_msg != NULL) {
g_free(dtls->dtls_last_msg);
dtls->dtls_last_msg = NULL;
}
g_free(dtls);
dtls = NULL;
}
SrtpChannel::~SrtpChannel() {
active_ = false;
ELOG_DEBUG("Deallocating SRTP sessions");
if (send_session_ != NULL) {
srtp_dealloc(send_session_);
}
if (receive_session_ != NULL) {
srtp_dealloc(receive_session_);
}
}
/**
* Switch off the security for the defined part.
*
* @param ctx
* Pointer to the opaque ZrtpContext structure.
* @param part Defines for which part (sender or receiver) to
* switch off security
*/
static void ozrtp_srtpSecretsOff (ZrtpContext* ctx, int32_t part ) {
OrtpZrtpContext *userData = user_data(ctx);
if (userData->srtpRecv != NULL) {
srtp_dealloc(userData->srtpRecv);
userData->srtpRecv=NULL;
}
if (userData->srtpSend != NULL) {
srtp_dealloc(userData->srtpSend);
userData->srtpSend=NULL;
}
ortp_message("ZRTP secrets off");
}
void ortp_zrtp_context_destroy(OrtpZrtpContext *ctx) {
ortp_message("Stopping ZRTP context");
zrtp_stopZrtpEngine(ctx->zrtpContext);
ortp_message("Destroying ZRTP wrapper");
zrtp_DestroyWrapper(ctx->zrtpContext);
ortp_message("Destroying ORTP-ZRTP mutex");
ortp_mutex_destroy(&ctx->mutex);
ortp_message("Destroying SRTP contexts");
if (ctx->srtpSend != NULL) srtp_dealloc(ctx->srtpSend);
if (ctx->srtpRecv != NULL) srtp_dealloc(ctx->srtpRecv);
ortp_message("ORTP-ZRTP context destroyed");
}
srtpw_err_status_t srtpw_srtp_destroy(srtpw_srtp *srtp)
{
if ((srtp_t)srtp)
{
srtp_dealloc((srtp_t)srtp);
}
return srtpw_err_status_ok;
}
static void destructor(void *arg)
{
struct menc_st *st = arg;
mem_deref(st->sdpm);
mem_deref(st->crypto_suite);
/* note: must be done before freeing socket */
mem_deref(st->uh_rtp);
mem_deref(st->uh_rtcp);
mem_deref(st->rtpsock);
mem_deref(st->rtcpsock);
if (st->srtp_tx)
srtp_dealloc(st->srtp_tx);
if (st->srtp_rx)
srtp_dealloc(st->srtp_rx);
}
void * sender_thread (void *arg)
{
err_status_t status;
thread_parms_t *tp = (thread_parms_t*)arg;
rtp_sender_t snd[NUM_SSRC_PER_THREAD];
int cnt = 0;
int i;
srtp_ctx_t *srtp_ctx = NULL;
printf("\nStarting sender thread (port: %d base-ssrc: %x stream_cnt: %d)\n",
tp->port, tp->ssrc, tp->stream_cnt);
/* initialize sender's rtp and srtp contexts */
status = srtp_create(&srtp_ctx, tp->policy);
if (status) {
fprintf(stderr,
"error: srtp_create() failed with code %d\n",
status);
exit(1);
}
/* now add the streams on the session */
for (i = 0; i < tp->stream_cnt; i++) {
rtp_sender_init(&snd[i], tp->sock, tp->name, tp->ssrc);
snd[i].srtp_ctx = srtp_ctx;
status = srtp_add_stream(snd[i].srtp_ctx, tp->policy);
if (status) {
fprintf(stderr,
"error: srtp_add_stream() failed with code %d\n",
status);
exit(1);
}
tp->policy->ssrc.value++;
tp->ssrc++;
}
while (cnt < THREAD_PKT_CNT) {
for (i = 0; i < tp->stream_cnt; i++) {
rtp_sendto(&snd[i], test_data, DATA_LEN);
cnt++;
if (cnt % STAT_WINDOW == 0) {
printf("Thread id %d transmit count is %d\n", tp->thread_num, cnt);
}
}
usleep(SLEEP_LEN);
}
/*
* Clean up the session
*/
srtp_dealloc(srtp_ctx);
return NULL;
}
int trtp_srtp_ctx_deinit(trtp_srtp_ctx_xt* ctx){
if(!ctx){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
if(ctx->initialized){
/*err_status_t srtp_err =*/ srtp_dealloc(ctx->session);
memset(&ctx->policy, 0, sizeof(ctx->policy));
ctx->initialized = tsk_false;
}
return 0;
}
void evrb_crypto_free(void* ctx)
{
EVRB_CRYPTO* evb_crypto=ctx;
if(evb_crypto) {
srtp_dealloc(evb_crypto->srtp_session);
if (evb_crypto->key) free(evb_crypto->key);
evb_crypto->key=0;
if (evb_crypto->dh)
dh_free(evb_crypto->dh);
free(ctx);
ctx=0;
}
}
JNIEXPORT jint JNICALL Java_org_theonionphone_protocol_SrtpProtocol_deinit
(JNIEnv *env, jobject obj) {
err_status_t status = srtp_dealloc((*srtpContextSend));
if(status) {
return status;
}
status = srtp_dealloc((*srtpContextRecv));
if(status) {
return status;
}
status = srtp_deinit();
if(status) {
return status;
}
free(srtpContextSend);
free(srtpContextRecv);
return status;
}
err_status_t srtp_print_policy(const srtp_policy_t *policy) {
err_status_t status;
srtp_t session;
status = srtp_create(&session, policy);
if (status)
return status;
status = srtp_session_print_policy(session);
if (status)
return status;
status = srtp_dealloc(session);
if (status)
return status;
return err_status_ok;
}
/* Clear the policy list
*/
static void
gst_srtp_dec_clear_streams (GstSrtpDec * filter)
{
guint nb = 0;
GST_OBJECT_LOCK (filter);
if (!filter->first_session)
srtp_dealloc (filter->session);
if (filter->streams)
nb = g_hash_table_foreach_remove (filter->streams, remove_yes, NULL);
filter->first_session = TRUE;
GST_OBJECT_UNLOCK (filter);
GST_DEBUG_OBJECT (filter, "Cleared %d streams", nb);
}
err_status_t ortp_srtp_dealloc(srtp_t session)
{
return srtp_dealloc(session);
}
int
rtp_decoder_deinit_srtp(rtp_decoder_t decoder) {
return srtp_dealloc(decoder->srtp_ctx);
}
/*
* Initialize and start SRTP session with the given parameters.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_start(
pjmedia_transport *tp,
const pjmedia_srtp_crypto *tx,
const pjmedia_srtp_crypto *rx)
{
transport_srtp *srtp = (transport_srtp*) tp;
srtp_policy_t tx_;
srtp_policy_t rx_;
err_status_t err;
int cr_tx_idx = 0;
int au_tx_idx = 0;
int cr_rx_idx = 0;
int au_rx_idx = 0;
pj_status_t status = PJ_SUCCESS;
PJ_ASSERT_RETURN(tp && tx && rx, PJ_EINVAL);
pj_lock_acquire(srtp->mutex);
if (srtp->session_inited) {
pjmedia_transport_srtp_stop(tp);
}
/* Get encryption and authentication method */
cr_tx_idx = au_tx_idx = get_crypto_idx(&tx->name);
if (tx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_tx_idx = 0;
if (tx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_tx_idx = 0;
cr_rx_idx = au_rx_idx = get_crypto_idx(&rx->name);
if (rx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_rx_idx = 0;
if (rx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_rx_idx = 0;
/* Check whether the crypto-suite requested is supported */
if (cr_tx_idx == -1 || cr_rx_idx == -1 || au_tx_idx == -1 ||
au_rx_idx == -1)
{
status = PJMEDIA_SRTP_ENOTSUPCRYPTO;
goto on_return;
}
/* If all options points to 'NULL' method, just bypass SRTP */
if (cr_tx_idx == 0 && cr_rx_idx == 0 && au_tx_idx == 0 && au_rx_idx == 0) {
srtp->bypass_srtp = PJ_TRUE;
goto on_return;
}
/* Check key length */
if (tx->key.slen != (pj_ssize_t)crypto_suites[cr_tx_idx].cipher_key_len ||
rx->key.slen != (pj_ssize_t)crypto_suites[cr_rx_idx].cipher_key_len)
{
status = PJMEDIA_SRTP_EINKEYLEN;
goto on_return;
}
/* Init transmit direction */
pj_bzero(&tx_, sizeof(srtp_policy_t));
pj_memmove(srtp->tx_key, tx->key.ptr, tx->key.slen);
if (cr_tx_idx && au_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf;
else if (au_tx_idx)
tx_.rtp.sec_serv = sec_serv_auth;
else
tx_.rtp.sec_serv = sec_serv_none;
tx_.key = (uint8_t*)srtp->tx_key;
tx_.ssrc.type = ssrc_any_outbound;
tx_.ssrc.value = 0;
tx_.rtp.cipher_type = crypto_suites[cr_tx_idx].cipher_type;
tx_.rtp.cipher_key_len = crypto_suites[cr_tx_idx].cipher_key_len;
tx_.rtp.auth_type = crypto_suites[au_tx_idx].auth_type;
tx_.rtp.auth_key_len = crypto_suites[au_tx_idx].auth_key_len;
tx_.rtp.auth_tag_len = crypto_suites[au_tx_idx].srtp_auth_tag_len;
tx_.rtcp = tx_.rtp;
tx_.rtcp.auth_tag_len = crypto_suites[au_tx_idx].srtcp_auth_tag_len;
tx_.next = NULL;
err = srtp_create(&srtp->srtp_tx_ctx, &tx_);
if (err != err_status_ok) {
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
goto on_return;
}
srtp->tx_policy = *tx;
pj_strset(&srtp->tx_policy.key, srtp->tx_key, tx->key.slen);
srtp->tx_policy.name=pj_str(crypto_suites[get_crypto_idx(&tx->name)].name);
/* Init receive direction */
pj_bzero(&rx_, sizeof(srtp_policy_t));
pj_memmove(srtp->rx_key, rx->key.ptr, rx->key.slen);
if (cr_rx_idx && au_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf;
else if (au_rx_idx)
rx_.rtp.sec_serv = sec_serv_auth;
else
rx_.rtp.sec_serv = sec_serv_none;
rx_.key = (uint8_t*)srtp->rx_key;
rx_.ssrc.type = ssrc_any_inbound;
rx_.ssrc.value = 0;
rx_.rtp.sec_serv = crypto_suites[cr_rx_idx].service;
rx_.rtp.cipher_type = crypto_suites[cr_rx_idx].cipher_type;
rx_.rtp.cipher_key_len = crypto_suites[cr_rx_idx].cipher_key_len;
rx_.rtp.auth_type = crypto_suites[au_rx_idx].auth_type;
rx_.rtp.auth_key_len = crypto_suites[au_rx_idx].auth_key_len;
rx_.rtp.auth_tag_len = crypto_suites[au_rx_idx].srtp_auth_tag_len;
rx_.rtcp = rx_.rtp;
rx_.rtcp.auth_tag_len = crypto_suites[au_rx_idx].srtcp_auth_tag_len;
rx_.next = NULL;
err = srtp_create(&srtp->srtp_rx_ctx, &rx_);
if (err != err_status_ok) {
srtp_dealloc(srtp->srtp_tx_ctx);
status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
goto on_return;
}
srtp->rx_policy = *rx;
pj_strset(&srtp->rx_policy.key, srtp->rx_key, rx->key.slen);
srtp->rx_policy.name=pj_str(crypto_suites[get_crypto_idx(&rx->name)].name);
/* Declare SRTP session initialized */
srtp->session_inited = PJ_TRUE;
/* Logging stuffs */
#if PJ_LOG_MAX_LEVEL >= 5
{
char b64[PJ_BASE256_TO_BASE64_LEN(MAX_KEY_LEN)];
int b64_len;
/* TX crypto and key */
b64_len = sizeof(b64);
status = pj_base64_encode((pj_uint8_t*)tx->key.ptr, tx->key.slen,
b64, &b64_len);
if (status != PJ_SUCCESS)
b64_len = pj_ansi_sprintf(b64, "--key too long--");
else
b64[b64_len] = '\0';
PJ_LOG(5, (srtp->pool->obj_name, "TX: %s key=%s",
srtp->tx_policy.name.ptr, b64));
if (srtp->tx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name, "TX: disable%s%s",
(cr_tx_idx?"":" enc"),
(au_tx_idx?"":" auth")));
}
/* RX crypto and key */
b64_len = sizeof(b64);
status = pj_base64_encode((pj_uint8_t*)rx->key.ptr, rx->key.slen,
b64, &b64_len);
if (status != PJ_SUCCESS)
b64_len = pj_ansi_sprintf(b64, "--key too long--");
else
b64[b64_len] = '\0';
PJ_LOG(5, (srtp->pool->obj_name, "RX: %s key=%s",
srtp->rx_policy.name.ptr, b64));
if (srtp->rx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name,"RX: disable%s%s",
(cr_rx_idx?"":" enc"),
(au_rx_idx?"":" auth")));
}
}
#endif
on_return:
pj_lock_release(srtp->mutex);
return status;
}
SrtpFlow::~SrtpFlow() {
if (session_) {
srtp_dealloc(session_);
}
}
srtp_err_status_t
test_dtls_srtp(void) {
srtp_hdr_t *test_packet;
int test_packet_len = 80;
srtp_t s;
srtp_policy_t policy;
uint8_t key[SRTP_MAX_KEY_LEN];
uint8_t salt[SRTP_MAX_KEY_LEN];
unsigned int key_len, salt_len;
srtp_profile_t profile;
srtp_err_status_t err;
/* create a 'null' SRTP session */
err = srtp_create(&s, NULL);
if (err)
return err;
/*
* verify that packet-processing functions behave properly - we
* expect that these functions will return srtp_err_status_no_ctx
*/
test_packet = srtp_create_test_packet(80, 0xa5a5a5a5);
if (test_packet == NULL)
return srtp_err_status_alloc_fail;
err = srtp_protect(s, test_packet, &test_packet_len);
if (err != srtp_err_status_no_ctx) {
printf("wrong return value from srtp_protect() (got code %d)\n",
err);
return srtp_err_status_fail;
}
err = srtp_unprotect(s, test_packet, &test_packet_len);
if (err != srtp_err_status_no_ctx) {
printf("wrong return value from srtp_unprotect() (got code %d)\n",
err);
return srtp_err_status_fail;
}
err = srtp_protect_rtcp(s, test_packet, &test_packet_len);
if (err != srtp_err_status_no_ctx) {
printf("wrong return value from srtp_protect_rtcp() (got code %d)\n",
err);
return srtp_err_status_fail;
}
err = srtp_unprotect_rtcp(s, test_packet, &test_packet_len);
if (err != srtp_err_status_no_ctx) {
printf("wrong return value from srtp_unprotect_rtcp() (got code %d)\n",
err);
return srtp_err_status_fail;
}
/*
* set keys to known values for testing
*/
profile = srtp_profile_aes128_cm_sha1_80;
key_len = srtp_profile_get_master_key_length(profile);
salt_len = srtp_profile_get_master_salt_length(profile);
memset(key, 0xff, key_len);
memset(salt, 0xee, salt_len);
srtp_append_salt_to_key(key, key_len, salt, salt_len);
policy.key = key;
/* initialize SRTP policy from profile */
err = srtp_crypto_policy_set_from_profile_for_rtp(&policy.rtp, profile);
if (err) return err;
err = srtp_crypto_policy_set_from_profile_for_rtcp(&policy.rtcp, profile);
if (err) return err;
policy.ssrc.type = ssrc_any_inbound;
policy.ekt = NULL;
policy.window_size = 128;
policy.allow_repeat_tx = 0;
policy.next = NULL;
err = srtp_add_stream(s, &policy);
if (err)
return err;
err = srtp_dealloc(s);
if (err)
return err;
free(test_packet);
return srtp_err_status_ok;
}
/*
* Initialize and start SRTP session with the given parameters.
*/
PJ_DEF(pj_status_t) pjmedia_transport_srtp_start(
pjmedia_transport *tp,
const pjmedia_srtp_crypto *tx,
const pjmedia_srtp_crypto *rx)
{
transport_srtp *srtp = (transport_srtp*) tp;
srtp_policy_t tx_;
srtp_policy_t rx_;
err_status_t err;
int cr_tx_idx = 0;
int au_tx_idx = 0;
int cr_rx_idx = 0;
int au_rx_idx = 0;
int crypto_suites_cnt;
PJ_ASSERT_RETURN(tp && tx && rx, PJ_EINVAL);
if (srtp->session_inited) {
pjmedia_transport_srtp_stop(tp);
}
crypto_suites_cnt = sizeof(crypto_suites)/sizeof(crypto_suites[0]);
/* Get encryption and authentication method */
cr_tx_idx = au_tx_idx = get_crypto_idx(&tx->name);
if (tx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_tx_idx = 0;
if (tx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_tx_idx = 0;
cr_rx_idx = au_rx_idx = get_crypto_idx(&rx->name);
if (rx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
cr_rx_idx = 0;
if (rx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
au_rx_idx = 0;
/* Check whether the crypto-suite requested is supported */
if (cr_tx_idx == -1 || cr_rx_idx == -1 || au_tx_idx == -1 ||
au_rx_idx == -1)
return PJMEDIA_SRTP_ENOTSUPCRYPTO;
/* If all options points to 'NULL' method, just bypass SRTP */
if (cr_tx_idx == 0 && cr_rx_idx == 0 && au_tx_idx == 0 && au_rx_idx == 0) {
srtp->bypass_srtp = PJ_TRUE;
return PJ_SUCCESS;
}
/* Check key length */
if (tx->key.slen != (pj_ssize_t)crypto_suites[cr_tx_idx].cipher_key_len ||
rx->key.slen != (pj_ssize_t)crypto_suites[cr_rx_idx].cipher_key_len)
return PJMEDIA_SRTP_EINKEYLEN;
/* Init transmit direction */
pj_bzero(&tx_, sizeof(srtp_policy_t));
pj_memmove(srtp->tx_key, tx->key.ptr, tx->key.slen);
if (cr_tx_idx && au_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_tx_idx)
tx_.rtp.sec_serv = sec_serv_conf;
else if (au_tx_idx)
tx_.rtp.sec_serv = sec_serv_auth;
else
tx_.rtp.sec_serv = sec_serv_none;
tx_.key = (uint8_t*)srtp->tx_key;
tx_.ssrc.type = ssrc_any_outbound;
tx_.ssrc.value = 0;
tx_.rtp.cipher_type = crypto_suites[cr_tx_idx].cipher_type;
tx_.rtp.cipher_key_len = crypto_suites[cr_tx_idx].cipher_key_len;
tx_.rtp.auth_type = crypto_suites[au_tx_idx].auth_type;
tx_.rtp.auth_key_len = crypto_suites[au_tx_idx].auth_key_len;
tx_.rtp.auth_tag_len = crypto_suites[au_tx_idx].srtp_auth_tag_len;
tx_.rtcp = tx_.rtp;
tx_.rtcp.auth_tag_len = crypto_suites[au_tx_idx].srtcp_auth_tag_len;
tx_.next = NULL;
err = srtp_create(&srtp->srtp_tx_ctx, &tx_);
if (err != err_status_ok) {
return PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
srtp->tx_policy = *tx;
pj_strset(&srtp->tx_policy.key, srtp->tx_key, tx->key.slen);
srtp->tx_policy.name=pj_str(crypto_suites[get_crypto_idx(&tx->name)].name);
/* Init receive direction */
pj_bzero(&rx_, sizeof(srtp_policy_t));
pj_memmove(srtp->rx_key, rx->key.ptr, rx->key.slen);
if (cr_rx_idx && au_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf_and_auth;
else if (cr_rx_idx)
rx_.rtp.sec_serv = sec_serv_conf;
else if (au_rx_idx)
rx_.rtp.sec_serv = sec_serv_auth;
else
rx_.rtp.sec_serv = sec_serv_none;
rx_.key = (uint8_t*)srtp->rx_key;
rx_.ssrc.type = ssrc_any_inbound;
rx_.ssrc.value = 0;
rx_.rtp.sec_serv = crypto_suites[cr_rx_idx].service;
rx_.rtp.cipher_type = crypto_suites[cr_rx_idx].cipher_type;
rx_.rtp.cipher_key_len = crypto_suites[cr_rx_idx].cipher_key_len;
rx_.rtp.auth_type = crypto_suites[au_rx_idx].auth_type;
rx_.rtp.auth_key_len = crypto_suites[au_rx_idx].auth_key_len;
rx_.rtp.auth_tag_len = crypto_suites[au_rx_idx].srtp_auth_tag_len;
rx_.rtcp = rx_.rtp;
rx_.rtcp.auth_tag_len = crypto_suites[au_rx_idx].srtcp_auth_tag_len;
rx_.next = NULL;
err = srtp_create(&srtp->srtp_rx_ctx, &rx_);
if (err != err_status_ok) {
srtp_dealloc(srtp->srtp_tx_ctx);
return PJMEDIA_ERRNO_FROM_LIBSRTP(err);
}
srtp->rx_policy = *rx;
pj_strset(&srtp->rx_policy.key, srtp->rx_key, rx->key.slen);
srtp->rx_policy.name=pj_str(crypto_suites[get_crypto_idx(&rx->name)].name);
/* Declare SRTP session initialized */
srtp->session_inited = PJ_TRUE;
PJ_LOG(5, (srtp->pool->obj_name, "TX: %s key=%s", srtp->tx_policy.name.ptr,
octet_string_hex_string(tx->key.ptr, tx->key.slen)));
if (srtp->tx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name,"TX: disable%s%s", (cr_tx_idx?"":" enc"),
(au_tx_idx?"":" auth")));
}
PJ_LOG(5, (srtp->pool->obj_name, "RX: %s key=%s", srtp->rx_policy.name.ptr,
octet_string_hex_string(rx->key.ptr, rx->key.slen)));
if (srtp->rx_policy.flags) {
PJ_LOG(5,(srtp->pool->obj_name,"RX: disable%s%s", (cr_rx_idx?"":" enc"),
(au_rx_idx?"":" auth")));
}
return PJ_SUCCESS;
}
err_status_t
srtcp_test(const srtp_policy_t *policy) {
int i;
srtp_t srtcp_sender;
srtp_t srtcp_rcvr;
err_status_t status = err_status_ok;
srtp_hdr_t *hdr, *hdr2;
uint8_t hdr_enc[64];
uint8_t *pkt_end;
int msg_len_octets, msg_len_enc;
int len;
int tag_length = policy->rtp.auth_tag_len;
uint32_t ssrc;
srtp_policy_t *rcvr_policy;
err_check(srtp_create(&srtcp_sender, policy));
/* print out policy */
err_check(srtp_session_print_policy(srtcp_sender));
/*
* initialize data buffer, using the ssrc in the policy unless that
* value is a wildcard, in which case we'll just use an arbitrary
* one
*/
if (policy->ssrc.type != ssrc_specific)
ssrc = 0xdecafbad;
else
ssrc = policy->ssrc.value;
msg_len_octets = 28;
hdr = srtp_create_test_packet(msg_len_octets, ssrc);
if (hdr == NULL)
return err_status_alloc_fail;
hdr2 = srtp_create_test_packet(msg_len_octets, ssrc);
if (hdr2 == NULL) {
free(hdr);
return err_status_alloc_fail;
}
/* set message length */
len = msg_len_octets;
debug_print(mod_driver, "before protection:\n%s",
srtp_packet_to_string(hdr, len));
#if PRINT_REFERENCE_PACKET
debug_print(mod_driver, "reference packet before protection:\n%s",
octet_string_hex_string((uint8_t *)hdr, len));
#endif
err_check(srtp_protect_rtcp(srtcp_sender, hdr, &len));
debug_print(mod_driver, "after protection:\n%s",
srtp_packet_to_string(hdr, len));
#if PRINT_REFERENCE_PACKET
debug_print(mod_driver, "after protection:\n%s",
octet_string_hex_string((uint8_t *)hdr, len));
#endif
/* save protected message and length */
memcpy(hdr_enc, hdr, len);
msg_len_enc = len;
/*
* check for overrun of the srtp_protect() function
*
* The packet is followed by a value of 0xfffff; if the value of the
* data following the packet is different, then we know that the
* protect function is overwriting the end of the packet.
*/
pkt_end = (uint8_t *)hdr + sizeof(srtp_hdr_t)
+ msg_len_octets + tag_length;
for (i = 0; i < 4; i++)
if (pkt_end[i] != 0xff) {
fprintf(stdout, "overwrite in srtp_protect_rtcp() function "
"(expected %x, found %x in trailing octet %d)\n",
0xff, ((uint8_t *)hdr)[i], i);
free(hdr);
free(hdr2);
return err_status_algo_fail;
}
/*
* if the policy includes confidentiality, check that ciphertext is
* different than plaintext
*
* Note that this check will give false negatives, with some small
* probability, especially if the packets are short. For that
* reason, we skip this check if the plaintext is less than four
* octets long.
*/
if ((policy->rtp.sec_serv & sec_serv_conf) && (msg_len_octets >= 4)) {
printf("testing that ciphertext is distinct from plaintext...");
status = err_status_algo_fail;
for (i=12; i < msg_len_octets+12; i++)
if (((uint8_t *)hdr)[i] != ((uint8_t *)hdr2)[i]) {
status = err_status_ok;
}
if (status) {
printf("failed\n");
free(hdr);
free(hdr2);
return status;
}
printf("passed\n");
}
/*
* if the policy uses a 'wildcard' ssrc, then we need to make a copy
* of the policy that changes the direction to inbound
*
* we always copy the policy into the rcvr_policy, since otherwise
* the compiler would fret about the constness of the policy
*/
rcvr_policy = malloc(sizeof(srtp_policy_t));
if (rcvr_policy == NULL)
return err_status_alloc_fail;
memcpy(rcvr_policy, policy, sizeof(srtp_policy_t));
if (policy->ssrc.type == ssrc_any_outbound) {
rcvr_policy->ssrc.type = ssrc_any_inbound;
}
err_check(srtp_create(&srtcp_rcvr, rcvr_policy));
err_check(srtp_unprotect_rtcp(srtcp_rcvr, hdr, &len));
debug_print(mod_driver, "after unprotection:\n%s",
srtp_packet_to_string(hdr, len));
/* verify that the unprotected packet matches the origial one */
for (i=0; i < msg_len_octets; i++)
if (((uint8_t *)hdr)[i] != ((uint8_t *)hdr2)[i]) {
fprintf(stdout, "mismatch at octet %d\n", i);
status = err_status_algo_fail;
}
if (status) {
free(hdr);
free(hdr2);
return status;
}
/*
* if the policy includes authentication, then test for false positives
*/
if (policy->rtp.sec_serv & sec_serv_auth) {
char *data = ((char *)hdr) + 12;
printf("testing for false positives in replay check...");
/* set message length */
len = msg_len_enc;
/* unprotect a second time - should fail with a replay error */
status = srtp_unprotect_rtcp(srtcp_rcvr, hdr_enc, &len);
if (status != err_status_replay_fail) {
printf("failed with error code %d\n", status);
free(hdr);
free(hdr2);
return status;
} else {
printf("passed\n");
}
printf("testing for false positives in auth check...");
/* increment sequence number in header */
hdr->seq++;
/* set message length */
len = msg_len_octets;
/* apply protection */
err_check(srtp_protect_rtcp(srtcp_sender, hdr, &len));
/* flip bits in packet */
data[0] ^= 0xff;
/* unprotect, and check for authentication failure */
status = srtp_unprotect_rtcp(srtcp_rcvr, hdr, &len);
if (status != err_status_auth_fail) {
printf("failed\n");
free(hdr);
free(hdr2);
return status;
} else {
printf("passed\n");
}
}
err_check(srtp_dealloc(srtcp_sender));
err_check(srtp_dealloc(srtcp_rcvr));
free(hdr);
free(hdr2);
return err_status_ok;
}
int
rtp_receiver_deinit_srtp(rtp_receiver_t sender) {
return srtp_dealloc(sender->srtp_ctx);
}
void * receiver_thread (void *arg)
{
err_status_t status;
rtp_receiver_t rcvr[NUM_SSRC_PER_THREAD];
int cnt = 0;
thread_parms_t *tp = (thread_parms_t*)arg;
int len = DATA_LEN;
char data[DATA_LEN + RTP_HEADER_LEN + 20]; //Adding 20 bytes for UDP header???
srtp_ctx_t *srtp_ctx = NULL;
int i;
printf("\nStarting receiver thread (port: %d base-ssrc: %x stream_cnt: %d)\n",
tp->port, tp->ssrc, tp->stream_cnt);
if (bind(tp->sock, (struct sockaddr*)&tp->name, sizeof(tp->name)) < 0) {
close(tp->sock);
pthread_mutex_lock(&t_mutex);
fprintf(output, "receiver socket bind error\n");
fflush(output);
pthread_mutex_unlock(&t_mutex);
perror(NULL);
exit(1);
}
status = srtp_create(&srtp_ctx, tp->policy);
if (status) {
pthread_mutex_lock(&t_mutex);
fprintf(output,
"error: srtp_create() failed with code %d\n",
status);
fflush(output);
pthread_mutex_unlock(&t_mutex);
exit(1);
}
/* now add the streams on the session */
for (i = 0; i < tp->stream_cnt; i++) {
rtp_receiver_init(&rcvr[i], tp->sock, tp->name, tp->ssrc);
rcvr[i].srtp_ctx = srtp_ctx;
status = srtp_add_stream(rcvr[i].srtp_ctx, tp->policy);
if (status) {
pthread_mutex_lock(&t_mutex);
fprintf(output,
"error: srtp_add_stream() failed with code %d\n",
status);
fflush(output);
pthread_mutex_unlock(&t_mutex);
exit(1);
}
tp->policy->ssrc.value++;
tp->ssrc++;
}
/* get next packet and loop */
while (cnt < THREAD_PKT_CNT) {
len = DATA_LEN + RTP_HEADER_LEN + 20;
if (rtp_recvfrom(&rcvr[0], data, &len) > -1) {
cnt++;
if (cnt % STAT_WINDOW == 0) {
pthread_mutex_lock(&t_mutex);
fprintf(output, "Thread id %d receive count is %d\n", tp->thread_num, cnt);
fflush(output);
pthread_mutex_unlock(&t_mutex);
}
}
}
/*
* Clean up the session
*/
srtp_dealloc(srtp_ctx);
return (NULL);
}
