Revert r4609 and use stateless request tokens; no need to save them in session and thus no keep-alive necessary; fixes #1487829

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Stateless request tokens. No keep-alive necessary on login page (#1487829)
 - PEAR::Net_SMTP 1.5.1
 - Allow multiple concurrent compose sessions
 - Force names of unique constraints in PostgreSQL DDL

index.php

@@ -154,9 +154,7 @@ else if ($RCMAIL->task != 'login' && $_SESSION['user_id'] && $RCMAIL->action !=
 
 // not logged in -> show login page
 if (empty($RCMAIL->user->ID)) {
-  if ($RCMAIL->action == 'keep-alive')
-    $OUTPUT->send();
-  else if ($OUTPUT->ajax_call)
+  if ($OUTPUT->ajax_call)
     $OUTPUT->redirect(array(), 2000);
 
   if (!empty($_REQUEST['_framed']))
@@ -184,7 +182,7 @@ else {
 
   // check client X-header to verify request origin
   if ($OUTPUT->ajax_call) {
-    if (rc_request_header('X-Roundcube-Request') != $RCMAIL->get_request_token()) {
+    if (rc_request_header('X-Roundcube-Request') != $RCMAIL->get_request_token() && !$RCMAIL->config->get('devel_mode')) {
       header('HTTP/1.1 404 Not Found');
       die("Invalid Request");
     }

program/include/rcmail.php

@@ -1106,12 +1106,8 @@ class rcmail
    */
   public function get_request_token()
   {
-    $key = $this->task;
-
-    if (!$_SESSION['request_tokens'][$key])
-      $_SESSION['request_tokens'][$key] = md5(uniqid($key . mt_rand(), true));
-
-    return $_SESSION['request_tokens'][$key];
+    $sess_id = $_COOKIE[ini_get('session.name')];
+    return md5('RT' . $this->task . $this->config->get('des_key') . $sess_id);
   }
 
 
@@ -1124,7 +1120,8 @@ class rcmail
   public function check_request($mode = RCUBE_INPUT_POST)
   {
     $token = get_input_value('_token', $mode);
-    return !empty($token) && $_SESSION['request_tokens'][$this->task] == $token;
+    $sess_id = $_COOKIE[ini_get('session.name')];
+    return !empty($sess_id) && $token == $this->get_request_token();
   }
 
 

program/js/app.js

@@ -5431,7 +5431,7 @@ function rcube_webmail()
 
     if (this.env.keep_alive && !this.env.framed && this.task == 'mail' && this.gui_objects.mailboxlist)
       this._int = setInterval(function(){ ref.check_for_recent(false); }, this.env.keep_alive * 1000);
-    else if (this.env.keep_alive && !this.env.framed && this.env.action != 'print')
+    else if (this.env.keep_alive && !this.env.framed && this.task != 'login' && this.env.action != 'print')
       this._int = setInterval(function(){ ref.send_keep_alive(); }, this.env.keep_alive * 1000);
   };