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https://github.com/tag1consulting/d7_to_d10_migration.git
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114 lines
4.1 KiB
PHP
114 lines
4.1 KiB
PHP
<?php
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/**
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* @file
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* Contains code for sanitizing user input from the request.
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*/
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/**
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* Sanitizes user input from the request.
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*/
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class DrupalRequestSanitizer {
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/**
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* Tracks whether the request was already sanitized.
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*/
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protected static $sanitized = FALSE;
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/**
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* Modifies the request to strip dangerous keys from user input.
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*/
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public static function sanitize() {
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if (!self::$sanitized) {
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$whitelist = variable_get('sanitize_input_whitelist', array());
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$log_sanitized_keys = variable_get('sanitize_input_logging', FALSE);
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// Process query string parameters.
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$get_sanitized_keys = array();
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$_GET = self::stripDangerousValues($_GET, $whitelist, $get_sanitized_keys);
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if ($log_sanitized_keys && $get_sanitized_keys) {
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_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from query string parameters (GET): @keys', array('@keys' => implode(', ', $get_sanitized_keys))), E_USER_NOTICE);
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}
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// Process request body parameters.
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$post_sanitized_keys = array();
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$_POST = self::stripDangerousValues($_POST, $whitelist, $post_sanitized_keys);
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if ($log_sanitized_keys && $post_sanitized_keys) {
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_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from request body parameters (POST): @keys', array('@keys' => implode(', ', $post_sanitized_keys))), E_USER_NOTICE);
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}
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// Process cookie parameters.
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$cookie_sanitized_keys = array();
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$_COOKIE = self::stripDangerousValues($_COOKIE, $whitelist, $cookie_sanitized_keys);
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if ($log_sanitized_keys && $cookie_sanitized_keys) {
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_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from cookie parameters (COOKIE): @keys', array('@keys' => implode(', ', $cookie_sanitized_keys))), E_USER_NOTICE);
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}
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$request_sanitized_keys = array();
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$_REQUEST = self::stripDangerousValues($_REQUEST, $whitelist, $request_sanitized_keys);
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self::$sanitized = TRUE;
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}
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}
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/**
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* Removes the destination if it is dangerous.
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*
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* Note this can only be called after common.inc has been included.
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*
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* @return bool
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* TRUE if the destination has been removed from $_GET, FALSE if not.
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*/
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public static function cleanDestination() {
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$dangerous_keys = array();
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$log_sanitized_keys = variable_get('sanitize_input_logging', FALSE);
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$parts = drupal_parse_url($_GET['destination']);
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// If there is a query string, check its query parameters.
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if (!empty($parts['query'])) {
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$whitelist = variable_get('sanitize_input_whitelist', array());
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self::stripDangerousValues($parts['query'], $whitelist, $dangerous_keys);
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if (!empty($dangerous_keys)) {
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// The destination is removed rather than sanitized to mirror the
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// handling of external destinations.
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unset($_GET['destination']);
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unset($_REQUEST['destination']);
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if ($log_sanitized_keys) {
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trigger_error(format_string('Potentially unsafe destination removed from query string parameters (GET) because it contained the following keys: @keys', array('@keys' => implode(', ', $dangerous_keys))));
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}
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Strips dangerous keys from the provided input.
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*
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* @param mixed $input
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* The input to sanitize.
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* @param string[] $whitelist
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* An array of keys to whitelist as safe.
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* @param string[] $sanitized_keys
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* An array of keys that have been removed.
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*
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* @return mixed
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* The sanitized input.
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*/
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protected static function stripDangerousValues($input, array $whitelist, array &$sanitized_keys) {
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if (is_array($input)) {
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foreach ($input as $key => $value) {
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if ($key !== '' && is_string($key) && $key[0] === '#' && !in_array($key, $whitelist, TRUE)) {
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unset($input[$key]);
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$sanitized_keys[] = $key;
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}
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else {
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$input[$key] = self::stripDangerousValues($input[$key], $whitelist, $sanitized_keys);
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}
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}
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}
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return $input;
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}
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}
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