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Simple PHP / jQuery CSRF Protection
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| <?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> |
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