libraries/cleanup.lib.php

   1 <?php
   2 /* $Id: common.lib.php 9531 2006-10-10 14:06:56Z nijel $ */
   3 // vim: expandtab sw=4 ts=4 sts=4:
   4
   5 /**
   6  * Functions for cleanup of user input.
   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     // do not check only $_REQUEST because it could have been overwritten
  19     // and use type casting because the variables could have become
  20     // strings
  21     $keys = array_keys(array_merge((array)$_REQUEST, (array)$_GET, (array)$_POST, (array)$_COOKIE));
  22
  23     foreach($keys as $key) {
  24         if (!in_array($key, $whitelist)) {
  25             unset($_REQUEST[$key], $_GET[$key], $_POST[$key], $GLOBALS[$key]);
  26         } else {
  27             // allowed stuff could be compromised so escape it
  28             // we require it to be a string
  29             if (isset($_REQUEST[$key]) && is_string($_REQUEST[$key])) {
  30                 $_REQUEST[$key] = htmlspecialchars($_REQUEST[$key], ENT_QUOTES);
  31             } else {
  32                 unset($_REQUEST[$key]);
  33             }
  34             if (isset($_POST[$key]) && is_string($_POST[$key])) {
  35                 $_POST[$key] = htmlspecialchars($_POST[$key], ENT_QUOTES);
  36             } else {
  37                 unset($_POST[$key]);
  38             }
  39             if (isset($_COOKIE[$key]) && is_string($_COOKIE[$key])) {
  40                 $_COOKIE[$key] = htmlspecialchars($_COOKIE[$key], ENT_QUOTES);
  41             } else {
  42                 unset($_COOKIE[$key]);
  43             }
  44             if (isset($_GET[$key]) && is_string($_GET[$key])) {
  45                 $_GET[$key] = htmlspecialchars($_GET[$key], ENT_QUOTES);
  46             } else {
  47                 unset($_GET[$key]);
  48             }
  49         }
  50     }
  51 }
  52 ?>