commit 081912943f951a49420b1f7d89288bab47f67500
author Matt Caswell <matt@openssl.org> Thu Jan 19 11:23:06 2017 +0000
committer Matt Caswell <matt@openssl.org> Mon Jan 30 10:18:21 2017 +0000
tree 5efbc819b81e5d4330472da9047b0cb59c3cc0b6
parent 128ae2769270f467982601b743964fb840aa2926

Use the correct session resumption mechanism

Don't attempt to add a TLS1.3 session to a TLS1.2 ClientHello session
ticket extensions. Similarly don't add a TLS1.2 session to a TLS1.3
psk extension.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2259)

ssl/statem/extensions_clnt.c

diff --git a/ssl/statem/extensions_clnt.c b/ssl/statem/extensions_clnt.c
index 1e6eddf..c17901a 100644
--- a/ssl/statem/extensions_clnt.c
+++ b/ssl/statem/extensions_clnt.c
@@ -191,7 +191,8 @@
         return 1;
 
     if (!s->new_session && s->session != NULL
-            && s->session->ext.tick != NULL) {
+            && s->session->ext.tick != NULL
+            && s->session->ssl_version != TLS1_3_VERSION) {
         ticklen = s->session->ext.ticklen;
     } else if (s->session && s->ext.session_ticket != NULL
                && s->ext.session_ticket->data != NULL) {
@@ -674,10 +675,11 @@
     s->session->ext.tick_identity = TLSEXT_PSK_BAD_IDENTITY;
 
     /*
-     * If this is a new session then we have nothing to resume so don't add
-     * this extension.
+     * If this is an incompatible or new session then we have nothing to resume
+     * so don't add this extension.
      */
-    if (s->session->ext.ticklen == 0)
+    if (s->session->ssl_version != TLS1_3_VERSION
+            || s->session->ext.ticklen == 0)
         return 1;
 
     /*

ssl/t1_lib.c

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 046b665..b0df32b 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -954,7 +954,7 @@
 
 int tls_use_ticket(SSL *s)
 {
-    if ((s->options & SSL_OP_NO_TICKET) || SSL_IS_TLS13(s))
+    if ((s->options & SSL_OP_NO_TICKET))
         return 0;
     return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
 }