tls13: cli: Ignore tickets if not supported

If a TLS 1.3 client receives a ticket and
the feature is not enabled, ignore it.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

library/ssl_msg.c

@@ -5570,40 +5570,44 @@ static int ssl_check_ctr_renegotiate(mbedtls_ssl_context *ssl)
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
 
-#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+#if defined(MBEDTLS_SSL_CLI_C)
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_tls13_check_new_session_ticket(mbedtls_ssl_context *ssl)
 {
 
     if ((ssl->in_hslen == mbedtls_ssl_hs_hdr_len(ssl)) ||
         (ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET)) {
-        return 0;
+        return -1;
     }
 
-    ssl->keep_current_message = 1;
-
-    MBEDTLS_SSL_DEBUG_MSG(3, ("NewSessionTicket received"));
-    mbedtls_ssl_handshake_set_state(ssl,
-                                    MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET);
-
-    return MBEDTLS_ERR_SSL_WANT_READ;
+    return 0;
 }
-#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+#endif /* MBEDTLS_SSL_CLI_C */
 
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_tls13_handle_hs_message_post_handshake(mbedtls_ssl_context *ssl)
 {
 
     MBEDTLS_SSL_DEBUG_MSG(3, ("received post-handshake message"));
 
-#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+#if defined(MBEDTLS_SSL_CLI_C)
     if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
         int ret = ssl_tls13_check_new_session_ticket(ssl);
-        if (ret != 0) {
-            return ret;
+        if (ret == 0) {
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+            MBEDTLS_SSL_DEBUG_MSG(3, ("NewSessionTicket received"));
+            ssl->keep_current_message = 1;
+
+            mbedtls_ssl_handshake_set_state(ssl,
+                                            MBEDTLS_SSL_TLS1_3_NEW_SESSION_TICKET);
+            return MBEDTLS_ERR_SSL_WANT_READ;
+#else
+            MBEDTLS_SSL_DEBUG_MSG(3, ("Ignore NewSessionTicket, not supported."));
+            return 0;
+#endif
         }
     }
-#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+#endif /* MBEDTLS_SSL_CLI_C */
 
     /* Fail in all other cases. */
     return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;