ACL check not present for verifying SIP INVITEs

The ACL check in check_peer_ok was missing and has now been restored. The
missing check allowed for calls to be made on prohibited networks where an ACL
was defined in sip.conf and the allowguest option was set to off. See the AST
security advisory below for more information.

Merge code associated with AST-2009-007.

(closes issue #16091)
Reported by: thom4fun


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@225912 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -14459,7 +14459,11 @@ static enum check_auth_result check_peer_ok(struct sip_pvt *p, char *of,
 				of, ast_inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port));
 		return AUTH_DONT_KNOW;
 	}
-
+	if (!ast_apply_ha(peer->ha, sin)) {
+		ast_debug(2, "Found peer '%s' for '%s', but fails host access\n", peer->name, of);
+		unref_peer(peer, "unref_peer: check_peer_ok: from find_peer call, early return of AUTH_ACL_FAILED");
+		return AUTH_ACL_FAILED;
+	}
 	if (debug)
 		ast_verbose("Found peer '%s' for '%s' from %s:%d\n",
 			peer->name, of, ast_inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port));