mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-27 02:14:45 +01:00
ff567e04e5
Restrict redirect.php to allow requests only from within eGroupware. HTTP_REFERER is checked against the egroupware path. A valid session is now required.
96 lines
2.9 KiB
PHP
96 lines
2.9 KiB
PHP
<?php
|
|
/**************************************************************************\
|
|
* eGroupWare - save redirect script *
|
|
* idea by: Jason Wies <jason@xc.net> *
|
|
* doing and adding to cvs: Lars Kneschke <lkneschke@linux-at-work.de> *
|
|
* http://www.egroupware.org *
|
|
* -------------------------------------------- *
|
|
* This program is free software; you can redistribute it and/or modify it *
|
|
* under the terms of the GNU General Public License as published by the *
|
|
* Free Software Foundation; either version 2 of the License, or (at your *
|
|
* option) any later version. *
|
|
\**************************************************************************/
|
|
|
|
/* $Id$ */
|
|
|
|
/*
|
|
Use this script when you want to link to a external url.
|
|
This way you don't send something like sessionid as referer
|
|
|
|
Use this in your app:
|
|
|
|
"<a href=\"$webserverURL/redirect.php?go=".htmlentities(urlencode('http://www.egroupware.org')).'">'
|
|
*/
|
|
|
|
if(!function_exists('html_entity_decode'))
|
|
{
|
|
function html_entity_decode($given_html, $quote_style = ENT_QUOTES)
|
|
{
|
|
$trans_table = array_flip(get_html_translation_table( HTML_SPECIALCHARS, $quote_style));
|
|
$trans_table['''] = "'";
|
|
return(strtr($given_html, $trans_table));
|
|
}
|
|
}
|
|
|
|
/* Only allow redirects with a valid session */
|
|
$GLOBALS['egw_info'] = array(
|
|
'flags' => array(
|
|
'noheader' => True,
|
|
'nonavbar' => True,
|
|
'currentapp' => 'home'
|
|
)
|
|
);
|
|
include('./header.inc.php');
|
|
|
|
|
|
/* Only allow redirects from inside this eGroupware installation. */
|
|
$valid_referer = array();
|
|
$path = preg_replace('/\/[^\/]*$/','',$_SERVER['PHP_SELF']) . '/';
|
|
array_push($valid_referer, $path);
|
|
array_push($valid_referer, ($_SERVER['HTTPS'] ? 'https://' : 'http://') . $_SERVER['SERVER_ADDR'] . $path);
|
|
array_push($valid_referer, ($_SERVER['HTTPS'] ? 'https://' : 'http://') . $_SERVER['SERVER_NAME'] . $path);
|
|
|
|
$referrer = trim($_SERVER['HTTP_REFERER']);
|
|
if ((!isset($_SERVER['HTTP_REFERER'])) || (empty($referrer)))
|
|
{
|
|
echo "Only usable from within eGroupware.\n";
|
|
}
|
|
else if($_GET['go'])
|
|
{
|
|
$allow = false;
|
|
foreach ($valid_referer as $urlRoot)
|
|
{
|
|
/* Check if the referrer begins with a valid URL. */
|
|
if (strncmp($urlRoot, $referrer, strlen($urlRoot)) == 0)
|
|
{
|
|
$allow = true;
|
|
break;
|
|
}
|
|
}
|
|
if ($allow)
|
|
{
|
|
$url= html_entity_decode(urldecode($_GET['go']));
|
|
unset($_GET['go']);
|
|
/* Only add "&" if there is something to append. */
|
|
if (!empty($_GET))
|
|
{
|
|
$url=$url."&".http_build_query($_GET);
|
|
}
|
|
|
|
Header('Location: ' . html_entity_decode(urldecode($url)));
|
|
exit;
|
|
}
|
|
else
|
|
{
|
|
echo "Redirect not allowed for referrer '".$_SERVER['HTTP_REFERER']."'.\n";
|
|
echo "<pre>";
|
|
print_r($valid_referer);
|
|
echo "<pre>\n";
|
|
}
|
|
}
|
|
else
|
|
{
|
|
echo "Error redirecting.";
|
|
}
|
|
?>
|