--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1929,6 +1929,40 @@ ngx_ssl_get_cipher_name(ngx_connection_t
 
 
 ngx_int_t
+ngx_ssl_get_session_id(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
+{
+    int           len;
+    u_char       *p, *buf;
+    SSL_SESSION  *sess;
+
+    sess = SSL_get0_session(c->ssl->connection);
+
+    len = i2d_SSL_SESSION(sess, NULL);
+
+    buf = ngx_alloc(len, c->log);
+    if (buf == NULL) {
+        return NGX_ERROR;
+    }
+
+    s->len = 2 * len;
+    s->data = ngx_pnalloc(pool, 2 * len);
+    if (s->data == NULL) {
+        ngx_free(p);
+        return NGX_ERROR;
+    }
+
+    p = buf;
+    i2d_SSL_SESSION(sess, &p);
+
+    ngx_hex_dump(s->data, buf, len);
+
+    ngx_free(buf);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t
 ngx_ssl_get_raw_certificate(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
 {
     size_t   len;