SSL: disabled saving tickets to session cache.

OpenSSL tries to save TLSv1.3 sessions into session cache even when using
tickets for stateless session resumption, "because some applications just
want to know about the creation of a session".  To avoid trashing session
cache with useless data, we do not save such sessions now.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 085ec5530..a80f30253 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -3818,6 +3818,23 @@ ngx_ssl_new_session(ngx_ssl_conn_t *ssl_conn, ngx_ssl_session_t *sess)
     ngx_ssl_session_cache_t  *cache;
     u_char                    buf[NGX_SSL_MAX_SESSION_SIZE];
 
+#ifdef TLS1_3_VERSION
+
+    /*
+     * OpenSSL tries to save TLSv1.3 sessions into session cache
+     * even when using tickets for stateless session resumption,
+     * "because some applications just want to know about the creation
+     * of a session"; do not cache such sessions
+     */
+
+    if (SSL_version(ssl_conn) == TLS1_3_VERSION
+        && (SSL_get_options(ssl_conn) & SSL_OP_NO_TICKET) == 0)
+    {
+        return 0;
+    }
+
+#endif
+
     len = i2d_SSL_SESSION(sess, NULL);
 
     /* do not cache too big session */