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  * @version $Id$
   7  */
   8
   9 /**
  10  * Removes all variables from request except whitelisted ones.
  11  *
  12  * @param string list of variables to allow
  13  * @return nothing
  14  * @access public
  15  * @author  Michal Cihar (michal@cihar.com)
  16  */
  17 function PMA_remove_request_vars(&$whitelist)
  18 {
  19     // do not check only $_REQUEST because it could have been overwritten
  20     // and use type casting because the variables could have become
  21     // strings
  22     $keys = array_keys(array_merge((array)$_REQUEST, (array)$_GET, (array)$_POST, (array)$_COOKIE));
  23
  24     foreach($keys as $key) {
  25         if (! in_array($key, $whitelist)) {
  26             unset($_REQUEST[$key], $_GET[$key], $_POST[$key], $GLOBALS[$key]);
  27         } else {
  28             // allowed stuff could be compromised so escape it
  29             // we require it to be a string
  30             if (isset($_REQUEST[$key]) && ! is_string($_REQUEST[$key])) {
  31                 unset($_REQUEST[$key]);
  32             }
  33             if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
  34                 unset($_POST[$key]);
  35             }
  36             if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
  37                 unset($_COOKIE[$key]);
  38             }
  39             if (isset($_GET[$key]) && ! is_string($_GET[$key])) {
  40                 unset($_GET[$key]);
  41             }
  42         }
  43     }
  44 }
  45 ?>