SSL: support for TLSv1.3 early data with BoringSSL.

Early data AKA 0-RTT mode is enabled as long as "ssl_early_data on" is
specified in the configuration (default is off).

The $ssl_early_data variable evaluates to "1" if the SSL handshake
isn't yet completed, and can be used to set the Early-Data header as
per draft-ietf-httpbis-replay-04.

1 files changed, 38 insertions, 0 deletions

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 805855147..cca4609f9 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1169,6 +1169,29 @@ ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name)
 
 
 ngx_int_t
+ngx_ssl_early_data(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_uint_t enable)
+{
+    if (!enable) {
+        return NGX_OK;
+    }
+
+#ifdef SSL_ERROR_EARLY_DATA_REJECTED
+
+    /* BoringSSL */
+
+    SSL_CTX_set_early_data_enabled(ssl->ctx, 1);
+
+#else
+    ngx_log_error(NGX_LOG_WARN, ssl->log, 0,
+                  "\"ssl_early_data\" is not supported on this platform, "
+                  "ignored");
+#endif
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_client_session_cache(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_uint_t enable)
 {
     if (!enable) {
@@ -3624,6 +3647,21 @@ ngx_ssl_get_session_reused(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
 
 
 ngx_int_t
+ngx_ssl_get_early_data(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
+{
+    s->len = 0;
+
+#ifdef SSL_ERROR_EARLY_DATA_REJECTED
+    if (SSL_in_early_data(c->ssl->connection)) {
+        ngx_str_set(s, "1");
+    }
+#endif
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_get_server_name(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
 {
 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME