phpmyadmin/libraries/cleanup.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * Functions for cleanup of user input.
   5  *
   6  * @package PhpMyAdmin
   7  */
   8 if (! defined('PHPMYADMIN')) {
   9     exit;
  10 }
  11
  12 /**
  13  * Removes all variables from request except whitelisted ones.
  14  *
  15  * @param string &$whitelist list of variables to allow
  16  *
  17  * @return void
  18  * @access public
  19  */
  20 function PMA_removeRequestVars(&$whitelist)
  21 {
  22     // do not check only $_REQUEST because it could have been overwritten
  23     // and use type casting because the variables could have become
  24     // strings
  25     $keys = array_keys(
  26         array_merge((array)$_REQUEST, (array)$_GET, (array)$_POST, (array)$_COOKIE)
  27     );
  28
  29     foreach ($keys as $key) {
  30         if (! in_array($key, $whitelist)) {
  31             unset($_REQUEST[$key], $_GET[$key], $_POST[$key], $GLOBALS[$key]);
  32             continue;
  33         }
  34
  35         // allowed stuff could be compromised so escape it
  36         // we require it to be a string
  37         if (isset($_REQUEST[$key]) && ! is_string($_REQUEST[$key])) {
  38             unset($_REQUEST[$key]);
  39         }
  40         if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
  41             unset($_POST[$key]);
  42         }
  43         if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
  44             unset($_COOKIE[$key]);
  45         }
  46         if (isset($_GET[$key]) && ! is_string($_GET[$key])) {
  47             unset($_GET[$key]);
  48         }
  49     }
  50 }