pjsip_configuration.c: Disable DTLS renegotiation if WebRTC is enabled.

Per RFC8827:

    Implementations MUST NOT implement DTLS renegotiation and MUST
    reject it with a "no_renegotiation" alert if offered.

So we disable it when webrtc=yes is set.

Fixes #378

UpgradeNote: The dtls_rekey will be disabled if webrtc support is
requested on an endpoint. A warning will also be emitted.

(cherry picked from commit c7afd5357c9e1ec5d779d04391b52e77f2513b59)

diff --git a/res/res_pjsip/pjsip_configuration.c b/res/res_pjsip/pjsip_configuration.c
index ea62187f495c3c9c25e0e8c5c457064cf5611a38..613d06fa5205510590e4eb0cc355d6640bf8c4a5 100644 (file)
--- a/res/res_pjsip/pjsip_configuration.c
+++ b/res/res_pjsip/pjsip_configuration.c
@@ -1589,6 +1589,13 @@ static int sip_endpoint_apply_handler(const struct ast_sorcery *sorcery, void *o
                endpoint->media.rtp.dtls_cfg.default_setup = AST_RTP_DTLS_SETUP_ACTPASS;
                endpoint->media.rtp.dtls_cfg.verify = AST_RTP_DTLS_VERIFY_FINGERPRINT;
 
+               /* RFC8827 says: Implementations MUST NOT implement DTLS renegotiation
+                * and MUST reject it with a "no_renegotiation" alert if offered. */
+               if (endpoint->media.rtp.dtls_cfg.rekey) {
+                       ast_log(LOG_WARNING, "DTLS renegotiation is not supported with WebRTC. Disabling dtls_rekey.\n");
+                       endpoint->media.rtp.dtls_cfg.rekey = 0;
+               }
+
                if (ast_strlen_zero(endpoint->media.rtp.dtls_cfg.certfile)) {
                        /* If no certificate has been specified, try to automatically create one */
                        endpoint->media.rtp.dtls_cfg.ephemeral_cert = 1;