libraries/grab_globals.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * This library grabs the names and values of the variables sent or posted to a
   5  * script in $_GET, $_POST and $_FILES superglobals and sets simple globals
   6  * variables from them. It does the same work for $HTTP_ACCEPT_LANGUAGE and
   7  * $HTTP_AUTHORIZATION.
   8  *
   9  * @package phpMyAdmin
  10  */
  11 if (! defined('PHPMYADMIN')) {
  12     exit;
  13 }
  14
  15 /**
  16  * copy values from one array to another, usually from a superglobal into $GLOBALS
  17  *
  18  * @param array   $array      values from
  19  * @param array   $target     values to
  20  * @param boolean $sanitize   prevent importing key names in $_import_blacklist
  21  */
  22 function PMA_recursive_extract($array, &$target, $sanitize = true)
  23 {
  24     if (! is_array($array)) {
  25         return false;
  26     }
  27
  28     if ($sanitize) {
  29         $valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
  30             array_keys($array));
  31         $valid_variables = array_unique($valid_variables);
  32     } else {
  33         $valid_variables = array_keys($array);
  34     }
  35
  36     foreach ($valid_variables as $key) {
  37
  38         if (strlen($key) === 0) {
  39             continue;
  40         }
  41
  42         if (is_array($array[$key])) {
  43             // there could be a variable coming from a cookie of
  44             // another application, with the same name as this array
  45             unset($target[$key]);
  46
  47             PMA_recursive_extract($array[$key], $target[$key], false);
  48         } else {
  49             $target[$key] = $array[$key];
  50         }
  51     }
  52     return true;
  53 }
  54
  55
  56 /**
  57  * @var array $_import_blacklist variable names that should NEVER be imported
  58  *                              from superglobals
  59  */
  60 $_import_blacklist = array(
  61     '/^cfg$/i',         // PMA configuration
  62     '/^server$/i',      // selected server
  63     '/^db$/i',          // page to display
  64     '/^table$/i',       // page to display
  65     '/^goto$/i',        // page to display
  66     '/^back$/i',        // the page go back
  67     '/^lang$/i',        // selected language
  68     '/^collation_connection$/i', //
  69     '/^set_theme$/i',   //
  70     '/^sql_query$/i',   // the query to be executed
  71     '/^GLOBALS$/i',     // the global scope
  72     '/^str.*$/i',       // PMA localized strings
  73     '/^error_handler.*$/i',       // the error handler
  74     '/^_.*$/i',         // PMA does not use variables starting with _ from extern
  75     '/^.*\s+.*$/i',     // no whitespaces anywhere
  76     '/^[0-9]+.*$/i',    // numeric variable names
  77     //'/^PMA_.*$/i',      // other PMA variables
  78 );
  79
  80 if (! empty($_GET)) {
  81     PMA_recursive_extract($_GET, $GLOBALS);
  82 }
  83
  84 if (! empty($_POST)) {
  85     PMA_recursive_extract($_POST, $GLOBALS);
  86 }
  87
  88 if (! empty($_FILES)) {
  89     $_valid_variables = preg_replace($GLOBALS['_import_blacklist'], '', array_keys($_FILES));
  90     foreach ($_valid_variables as $name) {
  91         if (strlen($name) != 0) {
  92             $$name = $_FILES[$name]['tmp_name'];
  93             ${$name . '_name'} = $_FILES[$name]['name'];
  94         }
  95     }
  96     unset($name, $value);
  97 }
  98
  99 /**
 100  * globalize some environment variables
 101  */
 102 $server_vars = array('HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
 103 foreach ($server_vars as $current) {
 104     // it's not important HOW we detect html tags
 105     // it's more important to prevent XSS
 106     // so it's not important if we result in an invalid string,
 107     // it's even better than a XSS capable string
 108     if (PMA_getenv($current) && false === strpos(PMA_getenv($current), '<')) {
 109         $$current = PMA_getenv($current);
 110     // already imported by register_globals?
 111     } elseif (! isset($$current) || false !== strpos($$current, '<')) {
 112         $$current = '';
 113     }
 114 }
 115 unset($server_vars, $current, $_import_blacklist);
 116
 117 ?>