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Original file line number | Diff line number | Diff line change |
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<?php | ||
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/** | ||
* @file | ||
* Contains code for sanitizing user input from the request. | ||
*/ | ||
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/** | ||
* Sanitizes user input from the request. | ||
*/ | ||
class DrupalRequestSanitizer { | ||
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/** | ||
* Tracks whether the request was already sanitized. | ||
*/ | ||
protected static $sanitized = FALSE; | ||
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/** | ||
* Modifies the request to strip dangerous keys from user input. | ||
*/ | ||
public static function sanitize() { | ||
if (!self::$sanitized) { | ||
$whitelist = variable_get('sanitize_input_whitelist', array()); | ||
$log_sanitized_keys = variable_get('sanitize_input_logging', FALSE); | ||
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// Process query string parameters. | ||
$get_sanitized_keys = array(); | ||
$_GET = self::stripDangerousValues($_GET, $whitelist, $get_sanitized_keys); | ||
if ($log_sanitized_keys && $get_sanitized_keys) { | ||
_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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// Process request body parameters. | ||
$post_sanitized_keys = array(); | ||
$_POST = self::stripDangerousValues($_POST, $whitelist, $post_sanitized_keys); | ||
if ($log_sanitized_keys && $post_sanitized_keys) { | ||
_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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// Process cookie parameters. | ||
$cookie_sanitized_keys = array(); | ||
$_COOKIE = self::stripDangerousValues($_COOKIE, $whitelist, $cookie_sanitized_keys); | ||
if ($log_sanitized_keys && $cookie_sanitized_keys) { | ||
_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from cookie parameters (COOKIE): @keys', array('@keys' => implode(', ', $cookie_sanitized_keys))), E_USER_NOTICE); | ||
} | ||
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$request_sanitized_keys = array(); | ||
$_REQUEST = self::stripDangerousValues($_REQUEST, $whitelist, $request_sanitized_keys); | ||
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self::$sanitized = TRUE; | ||
} | ||
} | ||
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/** | ||
* Strips dangerous keys from the provided input. | ||
* | ||
* @param mixed $input | ||
* The input to sanitize. | ||
* @param string[] $whitelist | ||
* An array of keys to whitelist as safe. | ||
* @param string[] $sanitized_keys | ||
* An array of keys that have been removed. | ||
* | ||
* @return mixed | ||
* The sanitized input. | ||
*/ | ||
protected static function stripDangerousValues($input, array $whitelist, array &$sanitized_keys) { | ||
if (is_array($input)) { | ||
foreach ($input as $key => $value) { | ||
if ($key !== '' && $key[0] === '#' && !in_array($key, $whitelist, TRUE)) { | ||
unset($input[$key]); | ||
$sanitized_keys[] = $key; | ||
} | ||
else { | ||
$input[$key] = self::stripDangerousValues($input[$key], $whitelist, $sanitized_keys); | ||
} | ||
} | ||
} | ||
return $input; | ||
} | ||
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} |
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