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.

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 085ec553034d4b8dc00746cb795334e87adeb890..a80f30253c28fc3e163ccbba3794420b63a3c45a 100644 (file)
--- 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 */