Viewing file:  grab_globals.lib.php (5.38 KB) -rw-rw-rw-
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
<?php
/* $Id: grab_globals.lib.php,v 2.20.2.1 2005/12/07 08:08:52 lem9 Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:
/**
* This library grabs the names and values of the variables sent or posted to a
* script in the $_* arrays and sets simple globals variables from them. It does
* the same work for the $PHP_SELF, $HTTP_ACCEPT_LANGUAGE and
* $HTTP_AUTHORIZATION variables.
*
* loic1 - 2001/25/11: use the new globals arrays defined with php 4.1+
*/
// just to be sure there was no import (registering) before here
$variables_whitelist = array (
'GLOBALS',
'_SERVER',
'_GET',
'_POST',
'_REQUEST',
'_FILES',
'_ENV',
'_COOKIE',
);
foreach ( get_defined_vars() as $key => $value ) {
if ( ! in_array( $key, $variables_whitelist ) ) {
unset( $$key );
}
}
unset( $key, $value );
// protect against older PHP versions' bug about GLOBALS overwrite
// (no need to translate this one :) )
// but what if script.php?GLOABLS[admin]=1&GLOBALS[_REQUEST]=1 ???
if ( isset( $_REQUEST['GLOBALS'] ) || isset( $_FILES['GLOBALS'] )
|| isset( $_SERVER['GLOBALS'] ) || isset( $_COOKIE['GLOBALS'] )
|| isset( $_ENV['GLOBALS'] ) ) {
die( 'GLOBALS overwrite attempt' );
}
require_once './libraries/session.inc.php';
/**
* @var array $_import_blacklist variable names that should NEVER be imported
* from superglobals
*/
$_import_blacklist = array(
'/^cfg$/i', // PMA configuration
'/^GLOBALS$/i', // the global scope
'/^str.*$/i', // PMA strings
'/^_.*$/i', // PMA does not use variables starting with _ from extern
'/^.*\s+.*$/i', // no whitespaces anywhere
'/^[0-9]+.*$/i', // numeric variable names
//'/^PMA_.*$/i', // other PMA variables
);
/**
* copy values from one array to another, usally from a superglobal into $GLOBALS
*
* @uses $GLOBALS['_import_blacklist']
* @uses preg_replace()
* @uses array_keys()
* @uses array_unique()
* @uses get_magic_quotes_gpc() to check wether stripslashes or not
* @uses stripslashes()
* @param array $array values from
* @param array $target values to
* @param boolean $sanitize prevent importing key names in $_import_blacklist
*/
function PMA_gpc_extract($array, &$target, $sanitize = TRUE) {
if (!is_array($array)) {
return FALSE;
}
if ( $sanitize ) {
$valid_variables = preg_replace( $GLOBALS['_import_blacklist'], '',
array_keys( $array ) );
$valid_variables = array_unique( $valid_variables );
} else {
$valid_variables = array_keys( $array );
}
$is_magic_quotes = get_magic_quotes_gpc();
foreach ( $valid_variables as $key ) {
if ( strlen( $key ) === 0 ) {
continue;
}
if ( is_array( $array[$key] ) ) {
// there could be a variable coming from a cookie of
// another application, with the same name as this array
unset($target[$key]);
PMA_gpc_extract($array[$key], $target[$key], FALSE);
} elseif ($is_magic_quotes) {
$target[$key] = stripslashes($array[$key]);
} else {
$target[$key] = $array[$key];
}
}
return TRUE;
}
// check if a subform is submitted
$__redirect = NULL;
if ( isset( $_POST['usesubform'] ) ) {
// if a subform is present and should be used
// the rest of the form is deprecated
$subform_id = key( $_POST['usesubform'] );
$subform = $_POST['subform'][$subform_id];
$_POST = $subform;
if ( isset( $_POST['redirect'] )
&& $_POST['redirect'] != basename( $_SERVER['PHP_SELF'] ) ) {
$__redirect = $_POST['redirect'];
unset( $_POST['redirect'] );
} // end if ( isset( $_POST['redirect'] ) )
unset( $subform_id, $subform );
} // end if ( isset( $_POST['usesubform'] ) )
// end check if a subform is submitted
if (!empty($_GET)) {
PMA_gpc_extract($_GET, $GLOBALS);
} // end if
if (!empty($_POST)) {
PMA_gpc_extract($_POST, $GLOBALS);
} // end if (!empty($_POST))
if (!empty($_FILES)) {
foreach ($_FILES AS $name => $value) {
$$name = $value['tmp_name'];
${$name . '_name'} = $value['name'];
}
} // end if
unset( $name, $value );
if (!empty($_SERVER)) {
$server_vars = array('PHP_SELF', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_AUTHORIZATION');
foreach ( $server_vars as $current ) {
// its not important HOW we detect html tags
// its more important to prevent XSS
// so its not important if we result in an invalid string,
// its even better than a XSS capable string
if ( isset( $_SERVER[$current] ) && false === strpos( $_SERVER[$current], '<' ) ) {
$$current = $_SERVER[$current];
// already importet by register_globals?
} elseif ( ! isset( $$current ) || false !== strpos( $$current, '<' ) ) {
$$current = '';
}
}
unset( $server_vars, $current );
} // end if
// Security fix: disallow accessing serious server files via "?goto="
if (isset($goto) && strpos(' ' . $goto, '/') > 0 && substr($goto, 0, 2) != './') {
unset($goto);
} // end if
unset( $_import_blacklist );
if ( ! empty( $__redirect ) ) {
// TODO: ensure that PMA_securePath() is defined and available
// for this script. Meanwhile we duplicate what this function does:
require('./' . preg_replace('@\.\.*@','.',$__redirect));
exit();
} // end if ( ! empty( $__redirect ) )
?>
|