config_transport: Tell pjproject to allow all SSL/TLS protocols

The default tls settings for pjproject only allow TLS 1, TLS 1.1 and TLS 1.2.
SSL is not allowed.   So, even if you specify "sslv3" for a transport method,
it's silently ignored and one of the TLS protocols is used.  This was a new
behavior of pjsip_tls_setting_default() in 2.4 (when tls.proto was added) that
we never caught.

Now we need to set tls.proto = 0 after we call pjsip_tls_setting_default().
This tells pjproject to set the socket protocol to match the method.

ASTERISK-26004 #close

Change-Id: Icfb55c1ebe921298dedb4b1a1d3bdc3ca41dd078

diff --git a/res/res_pjsip/config_transport.c b/res/res_pjsip/config_transport.c
index d2c087487a505189a456ef3c6b1f68bc21f2ab83..3a5afb6bcc81aa4c81d4a4c452e6da5e478d77b0 100644 (file)
--- a/res/res_pjsip/config_transport.c
+++ b/res/res_pjsip/config_transport.c
@@ -378,6 +378,10 @@ static struct ast_sip_transport_state *find_or_create_temporary_state(struct ast
        new_state->type = transport->type;
 
        pjsip_tls_setting_default(&new_state->tls);
+#ifdef HAVE_PJSIP_TLS_TRANSPORT_PROTO
+       /* proto must be forced to 0 to enable all protocols otherwise only TLS will work */
+       new_state->tls.proto = 0;
+#endif
        new_state->tls.ciphers = new_state->ciphers;
 
        ao2_ref(new_state, +1);