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https://github.com/Shadowss/TravianZ.git
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Ferywir
60 lines
2.0 KiB
PHP
60 lines
2.0 KiB
PHP
<?php
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/**
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* CSRF protection helpers (issue #139).
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*
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* Shared by Admin/admin.php and the admin Mods (GameEngine/Admin/Mods/*.php),
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* which are POSTed to directly and therefore cannot rely on admin.php's
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* formerly-inline helpers. Include this file after the session is started:
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*
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* - csrf_token(): current per-session token (hex string)
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* - csrf_field(): hidden <input> to drop into any POST <form>
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* - csrf_verify(): abort with HTTP 403 if the POSTed token is missing/invalid
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*/
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// Defensive: callers normally start the session themselves, but make sure we
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// have one to store the token in.
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if (session_status() !== PHP_SESSION_ACTIVE) {
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session_start();
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}
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// Generate the token once per session.
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if (empty($_SESSION['_csrf_token'])) {
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$_SESSION['_csrf_token'] = bin2hex(random_bytes(32));
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}
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if (!function_exists('csrf_token')) {
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/**
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* Return the current CSRF token as a hex string.
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*/
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function csrf_token(): string
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{
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return $_SESSION['_csrf_token'] ?? '';
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}
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/**
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* Emit a ready-to-use hidden <input> for any POST <form> in a template.
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* Usage in a .tpl: <?php echo csrf_field(); ?>
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*/
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function csrf_field(): string
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{
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return '<input type="hidden" name="_csrf_token" value="' . htmlspecialchars(csrf_token(), ENT_QUOTES, 'UTF-8') . '">';
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}
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/**
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* Verify the CSRF token of a POST request.
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* Stops execution with HTTP 403 if the token is missing or does not match.
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* Uses hash_equals() instead of === to prevent timing attacks.
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*/
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function csrf_verify(): void
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{
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$submitted = isset($_POST['_csrf_token']) ? (string)$_POST['_csrf_token'] : '';
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$stored = csrf_token();
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if ($stored === '' || !hash_equals($stored, $submitted)) {
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http_response_code(403);
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// Generic message — does not reveal details about the mechanism.
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die('<h1>403 Forbidden</h1><p>Invalid or missing security token. Please go back and try again.</p>');
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}
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}
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}
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