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
   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  */
  16 function PMA_remove_request_vars(&$whitelist)
  17 {
  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                 unset($_REQUEST[$key]);
  31             }
  32             if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
  33                 unset($_POST[$key]);
  34             }
  35             if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
  36                 unset($_COOKIE[$key]);
  37             }
  38             if (isset($_GET[$key]) && ! is_string($_GET[$key])) {
  39                 unset($_GET[$key]);
  40             }
  41         }
  42     }
  43 }
  44 ?>