-
-
Save blackstrip/4ed97dcad92ccb328e2a to your computer and use it in GitHub Desktop.
Simple PHP / jQuery CSRF Protection
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <?php | |
| // See: http://blog.ircmaxell.com/2013/02/preventing-csrf-attacks.html | |
| // Start a session (which should use cookies over HTTP only). | |
| session_start(); | |
| // Create a new CSRF token. | |
| if (! isset($_SESSION['csrf_token'])) { | |
| $_SESSION['csrf_token'] = base64_encode(openssl_random_pseudo_bytes(32)); | |
| } | |
| // Check a POST is valid. | |
| if (isset($_POST['csrf_token']) && $_POST['csrf_token'] === $_SESSION['csrf_token']) { | |
| // POST data is valid. | |
| } | |
| ?> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>PHP CSRF Protection</title> | |
| <script> | |
| window.csrf = { csrf_token: '<?php echo $_SESSION['csrf_token']; ?>' }; | |
| $.ajaxSetup({ | |
| data: window.csrf | |
| }); | |
| $(document).ready(function() { | |
| // CSRF token is now automatically merged in AJAX request data. | |
| $.post('/awesome/ajax/url', { foo: 'bar' }, function(data) { | |
| console.log(data); | |
| }); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <form action="index.php" method="post" accept-charset="utf-8"> | |
| <input type="text" name="foo" /> | |
| <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token']; ?>" /> | |
| <input type="submit" value="Submit" /> | |
| </form> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment