Ensure chan_sip rejects encrypted streams without crypto info

This ensures that Asterisk rejects encrypted media streams (RTP/SAVP
audio and video) that are missing cryptographic keys and ensures that
the incoming SDP is consistent with RFC4568 as far as having a crypto
attribute present for any SAVP streams.

Review: https://reviewboard.asterisk.org/r/2204/
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Merged revisions 378217 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 378218 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@378219 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 9e193f1a1f835a14af039cb679ac3bea7e94d372..8fb61850c47e90fc5d1ad5467a9c11fbb4ebadaa 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -10378,6 +10378,15 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
                                  type, value,
                                  (processed == TRUE)? "OK." : "UNSUPPORTED OR FAILED.");
                }
+
+               /* Ensure crypto lines are provided where necessary */
+               if (audio && secure_audio && !processed_crypto) {
+                       ast_log(LOG_WARNING, "Rejecting secure audio stream without encryption details: %s\n", m);
+                       return -1;
+               } else if (video && secure_video && !processed_crypto) {
+                       ast_log(LOG_WARNING, "Rejecting secure video stream without encryption details: %s\n", m);
+                       return -1;
+               }
        }
 
        /* Sanity checks */