[Sommaire] [Imprimer]

   1  <?php
   2  /* $Id: grab_globals.lib.php 9467 2006-09-29 13:24:33Z lem9 $ */
   3  // vim: expandtab sw=4 ts=4 sts=4:
   4  
   5  
   6  /**
   7   * This library grabs the names and values of the variables sent or posted to a
   8   * script in the $_* arrays and sets simple globals variables from them. It does
   9   * the same work for the $PHP_SELF, $HTTP_ACCEPT_LANGUAGE and
  10   * $HTTP_AUTHORIZATION variables.
  11   *
  12   * loic1 - 2001/25/11: use the new globals arrays defined with php 4.1+
  13   */
  14  
  15  /**
  16   * copy values from one array to another, usally from a superglobal into $GLOBALS
  17   *
  18   * @uses    $GLOBALS['_import_blacklist']
  19   * @uses    preg_replace()
  20   * @uses    array_keys()
  21   * @uses    array_unique()
  22   * @uses    stripslashes()
  23   * @param   array   $array      values from
  24   * @param   array   $target     values to
  25   * @param   boolean $sanitize   prevent importing key names in $_import_blacklist
  26   */
  27  function PMA_gpc_extract($array, &$target, $sanitize = true)
  28  {
  29      if ( ! is_array($array) ) {
  30          return false;
  31      }
  32  
  33      if ( $sanitize ) {
  34          $valid_variables = preg_replace($GLOBALS['_import_blacklist'], '',
  35              array_keys($array));
  36          $valid_variables = array_unique($valid_variables);
  37      } else {
  38          $valid_variables = array_keys($array);
  39      }
  40  
  41      foreach ( $valid_variables as $key ) {
  42  
  43          if ( strlen($key) === 0 ) {
  44              continue;
  45          }
  46  
  47          if ( is_array($array[$key]) ) {
  48              // there could be a variable coming from a cookie of
  49              // another application, with the same name as this array
  50              unset( $target[$key] );
  51  
  52              PMA_gpc_extract($array[$key], $target[$key], false);
  53          } else {
  54              $target[$key] = $array[$key];
  55          }
  56      }
  57      return true;
  58  }
  59  
  60  
  61  /**
  62   * @var array $_import_blacklist variable names that should NEVER be imported
  63   *                              from superglobals
  64   */
  65  $_import_blacklist = array(
  66      '/^cfg$/i',         // PMA configuration
  67      '/^server$/i',      // selected server
  68      '/^db$/i',          // page to display
  69      '/^table$/i',       // page to display
  70      '/^goto$/i',        // page to display
  71      '/^back$/i',        // the page go back
  72      '/^lang$/i',        // selected language
  73      '/^convcharset$/i', // PMA convert charset
  74      '/^collation_connection$/i', //
  75      '/^set_theme$/i',   //
  76      '/^sql_query$/i',   // the query to be executed
  77      '/^GLOBALS$/i',     // the global scope
  78      '/^str.*$/i',       // PMA localized strings
  79      '/^_.*$/i',         // PMA does not use variables starting with _ from extern
  80      '/^.*\s+.*$/i',     // no whitespaces anywhere
  81      '/^[0-9]+.*$/i',    // numeric variable names
  82      //'/^PMA_.*$/i',      // other PMA variables
  83  );
  84  
  85  if (! empty($_GET)) {
  86      PMA_gpc_extract($_GET, $GLOBALS);
  87  }
  88  
  89  if (! empty($_POST)) {
  90      PMA_gpc_extract($_POST, $GLOBALS);
  91  }
  92  
  93  if (! empty($_FILES)) {
  94      $_valid_variables = preg_replace($GLOBALS['_import_blacklist'], '', array_keys($_FILES));
  95      foreach ($_valid_variables as $name) {
  96          if (strlen($name) != 0) {
  97              $$name = $_FILES[$name]['tmp_name'];
  98              ${$name . '_name'} = $_FILES[$name]['name'];
  99          }
 100      }
 101      unset($name, $value);
 102  }
 103  
 104  /**
 105   * globalize some environment variables
 106   */
 107  $server_vars = array('PHP_SELF', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
 108  foreach ($server_vars as $current) {
 109      // its not important HOW we detect html tags
 110      // its more important to prevent XSS
 111      // so its not important if we result in an invalid string,
 112      // its even better than a XSS capable string
 113      if (PMA_getenv($current) && false === strpos(PMA_getenv($current), '<')) {
 114          $$current = PMA_getenv($current);
 115      // already importet by register_globals?
 116      } elseif (! isset($$current) || false !== strpos($$current, '<')) {
 117          $$current = '';
 118      }
 119  }
 120  unset($server_vars, $current, $_import_blacklist);
 121  
 122  ?>