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