From 5af0cfd99a13fda9afad3380b0c50a3428acd299 Mon Sep 17 00:00:00 2001
From: Till Brehm <tbrehm@ispconfig.org>
Date: Wed, 03 Jun 2015 12:14:07 -0400
Subject: [PATCH] Extended the CSRF check.
---
interface/lib/classes/auth.inc.php | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/interface/lib/classes/auth.inc.php b/interface/lib/classes/auth.inc.php
index 9abb535..fe63fc6 100644
--- a/interface/lib/classes/auth.inc.php
+++ b/interface/lib/classes/auth.inc.php
@@ -201,6 +201,56 @@
$salt.="$";
return crypt($cleartext_password, $salt);
}
+
+ public function csrf_token_get($form_name) {
+ /* CSRF PROTECTION */
+ // generate csrf protection id and key
+ $_csrf_id = uniqid($form_name . '_'); // form id
+ $_csrf_key = sha1(uniqid(microtime(true), true)); // the key
+ if(!isset($_SESSION['_csrf'])) $_SESSION['_csrf'] = array();
+ if(!isset($_SESSION['_csrf_timeout'])) $_SESSION['_csrf_timeout'] = array();
+ $_SESSION['_csrf'][$_csrf_id] = $_csrf_key;
+ $_SESSION['_csrf_timeout'][$_csrf_id] = time() + 3600; // timeout hash in 1 hour
+
+ return array('csrf_id' => $_csrf_id,'csrf_key' => $_csrf_key);
+ }
+
+ public function csrf_token_check() {
+ global $app;
+
+ if(isset($_POST) && is_array($_POST)) {
+ $_csrf_valid = false;
+ if(isset($_POST['_csrf_id']) && isset($_POST['_csrf_key'])) {
+ $_csrf_id = trim($_POST['_csrf_id']);
+ $_csrf_key = trim($_POST['_csrf_key']);
+ if(isset($_SESSION['_csrf']) && isset($_SESSION['_csrf'][$_csrf_id]) && isset($_SESSION['_csrf_timeout']) && isset($_SESSION['_csrf_timeout'][$_csrf_id])) {
+ if($_SESSION['_csrf'][$_csrf_id] === $_csrf_key && $_SESSION['_csrf_timeout'] >= time()) $_csrf_valid = true;
+ }
+ }
+ if($_csrf_valid !== true) {
+ $app->log('CSRF attempt blocked. Referer: ' . (isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : 'unknown'), LOGLEVEL_WARN);
+ $app->error($app->lng('err_csrf_attempt_blocked'));
+ }
+ $_SESSION['_csrf'][$_csrf_id] = null;
+ $_SESSION['_csrf_timeout'][$_csrf_id] = null;
+ unset($_SESSION['_csrf'][$_csrf_id]);
+ unset($_SESSION['_csrf_timeout'][$_csrf_id]);
+
+ if(isset($_SESSION['_csrf_timeout']) && is_array($_SESSION['_csrf_timeout'])) {
+ $to_unset = array();
+ foreach($_SESSION['_csrf_timeout'] as $_csrf_id => $timeout) {
+ if($timeout < time()) $to_unset[] = $_csrf_id;
+ }
+ foreach($to_unset as $_csrf_id) {
+ $_SESSION['_csrf'][$_csrf_id] = null;
+ $_SESSION['_csrf_timeout'][$_csrf_id] = null;
+ unset($_SESSION['_csrf'][$_csrf_id]);
+ unset($_SESSION['_csrf_timeout'][$_csrf_id]);
+ }
+ unset($to_unset);
+ }
+ }
+ }
}
--
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