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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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rtspsrc: create and send the RTCP encryption key
Create and make a key for encrypting the RTCP packets back to the server and wrap this in a MIKEY message that we send as a header in the SETUP request.
This commit is contained in:
Wim Taymans
parent
a52b7eadfd
commit
2edd450369
2 changed files with 124 additions and 2 deletions
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@ -1517,6 +1517,7 @@ gst_rtspsrc_stream_free (GstRTSPSrc * src, GstRTSPStream * stream)
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}
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if (stream->channelpad[i])
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gst_object_unref (stream->channelpad[i]);
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if (stream->udpsink[i]) {
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gst_element_set_state (stream->udpsink[i], GST_STATE_NULL);
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gst_bin_remove (GST_BIN_CAST (src), stream->udpsink[i]);
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@ -1533,12 +1534,16 @@ gst_rtspsrc_stream_free (GstRTSPSrc * src, GstRTSPStream * stream)
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if (stream->added)
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gst_element_remove_pad (GST_ELEMENT_CAST (src), stream->srcpad);
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}
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if (stream->srtpenc)
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gst_object_unref (stream->srtpenc);
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if (stream->srtpdec)
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gst_object_unref (stream->srtpdec);
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if (stream->key)
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gst_buffer_unref (stream->key);
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if (stream->rtcppad)
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gst_object_unref (stream->rtcppad);
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if (stream->session)
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g_object_unref (stream->session);
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if (stream->srtpdec)
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gst_object_unref (stream->srtpdec);
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g_free (stream);
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}
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@ -2955,6 +2960,7 @@ request_key (GstElement * srtpdec, guint ssrc, GstRTSPStream * stream)
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static GstElement *
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request_rtp_decoder (GstElement * rtpbin, guint session, GstRTSPStream * stream)
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{
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GST_DEBUG ("decoder session %u, stream %p, %d", session, stream, stream->id);
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if (stream->id != session)
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return NULL;
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@ -2975,6 +2981,38 @@ request_rtp_decoder (GstElement * rtpbin, guint session, GstRTSPStream * stream)
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return gst_object_ref (stream->srtpdec);
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}
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static GstElement *
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request_rtcp_encoder (GstElement * rtpbin, guint session,
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GstRTSPStream * stream)
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{
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gchar *name;
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GstPad *pad;
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GST_DEBUG ("decoder session %u, stream %p, %d", session, stream, stream->id);
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if (stream->id != session)
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return NULL;
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if (stream->profile != GST_RTSP_PROFILE_SAVP &&
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stream->profile != GST_RTSP_PROFILE_SAVPF)
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return NULL;
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if (stream->srtpenc == NULL) {
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name = g_strdup_printf ("srtpenc_%u", session);
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stream->srtpenc = gst_element_factory_make ("srtpenc", name);
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g_free (name);
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/* key has been made before */
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g_object_set (stream->srtpenc, "key", stream->key, NULL);
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}
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name = g_strdup_printf ("rtcp_sink_%d", session);
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pad = gst_element_get_request_pad (stream->srtpenc, name);
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g_free (name);
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gst_object_unref (pad);
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return gst_object_ref (stream->srtpenc);
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}
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/* try to get and configure a manager */
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static gboolean
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gst_rtspsrc_stream_configure_manager (GstRTSPSrc * src, GstRTSPStream * stream,
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@ -3074,6 +3112,8 @@ gst_rtspsrc_stream_configure_manager (GstRTSPSrc * src, GstRTSPStream * stream,
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(GCallback) request_rtp_decoder, stream);
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g_signal_connect (src->manager, "request-rtcp-decoder",
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(GCallback) request_rtp_decoder, stream);
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g_signal_connect (src->manager, "request-rtcp-encoder",
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(GCallback) request_rtcp_encoder, stream);
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/* we stream directly to the manager, get some pads. Each RTSP stream goes
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* into a separate RTP session. */
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@ -5762,6 +5802,79 @@ failed:
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}
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}
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static gchar *
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gst_rtspsrc_stream_make_keymgmt (GstRTSPSrc * src, GstRTSPStream * stream)
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{
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GBytes *bytes;
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gchar *result, *base64;
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guint8 *key_data;
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const guint8 *data;
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gsize size;
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guint i;
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GstMIKEYMessage *msg;
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GstMIKEYPayload *payload;
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guint8 byte;
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#define KEY_SIZE 30
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key_data = g_malloc (KEY_SIZE);
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for (i = 0; i < KEY_SIZE; i += 4)
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GST_WRITE_UINT32_BE (key_data + i, g_random_int ());
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if (stream->key)
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gst_buffer_unref (stream->key);
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stream->key = gst_buffer_new_wrapped (key_data, KEY_SIZE);
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msg = gst_mikey_message_new ();
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/* unencrypted MIKEY message, we send this over TLS so this is allowed */
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gst_mikey_message_set_info (msg, GST_MIKEY_VERSION, GST_MIKEY_TYPE_PSK_INIT,
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FALSE, GST_MIKEY_PRF_MIKEY_1, 0, GST_MIKEY_MAP_TYPE_SRTP);
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/* add policy '0' for our SSRC */
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gst_mikey_message_add_cs_srtp (msg, 0, stream->ssrc, 0);
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/* timestamp is now */
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gst_mikey_message_add_t_now_ntp_utc (msg);
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/* add some random data */
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gst_mikey_message_add_rand_len (msg, 16);
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/* the policy '0' is SRTP */
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payload = gst_mikey_payload_new (GST_MIKEY_PT_SP);
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gst_mikey_payload_sp_set (payload, 0, GST_MIKEY_SEC_PROTO_SRTP);
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/* only AES-CM is supported */
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byte = 1;
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gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_ENC_ALG, 1, &byte);
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/* only HMAC-SHA1 */
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gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_AUTH_ALG, 1,
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&byte);
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/* we enable encryption on RTP and RTCP */
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gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTP_ENC, 1,
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&byte);
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gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTCP_ENC, 1,
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&byte);
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/* we enable authentication on RTP and RTCP */
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gst_mikey_payload_sp_add_param (payload, GST_MIKEY_SP_SRTP_SRTP_AUTH, 1,
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&byte);
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gst_mikey_message_add_payload (msg, payload);
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/* add the key in KEMAC */
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gst_mikey_message_add_kemac (msg, GST_MIKEY_ENC_NULL, KEY_SIZE, key_data,
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GST_MIKEY_MAC_NULL, NULL);
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/* now serialize this to bytes */
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bytes = gst_mikey_message_to_bytes (msg);
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gst_mikey_message_free (msg);
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/* and make it into base64 */
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data = g_bytes_get_data (bytes, &size);
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base64 = g_base64_encode (data, size);
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g_bytes_unref (bytes);
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result = g_strdup_printf ("prot=mikey; uri=\"%s\"; data=\"%s\"",
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stream->conninfo.location, base64);
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g_free (base64);
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return result;
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}
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/* Perform the SETUP request for all the streams.
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*
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* We ask the server for a specific transport, which initially includes all the
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@ -5939,6 +6052,13 @@ gst_rtspsrc_setup_streams (GstRTSPSrc * src, gboolean async)
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/* select transport */
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gst_rtsp_message_take_header (&request, GST_RTSP_HDR_TRANSPORT, transports);
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/* set up keys */
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if (stream->profile == GST_RTSP_PROFILE_SAVP ||
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stream->profile == GST_RTSP_PROFILE_SAVPF) {
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hval = gst_rtspsrc_stream_make_keymgmt (src, stream);
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gst_rtsp_message_take_header (&request, GST_RTSP_HDR_KEYMGMT, hval);
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}
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/* if the user wants a non default RTP packet size we add the blocksize
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* parameter */
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if (src->rtp_blocksize > 0) {
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@ -137,6 +137,8 @@ struct _GstRTSPStream {
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guint32 seqbase;
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guint64 timebase;
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GstElement *srtpdec;
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GstBuffer *key;
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GstElement *srtpenc;
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/* per stream connection */
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GstRTSPConnInfo conninfo;
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