100 lines
2.8 KiB
PHP
100 lines
2.8 KiB
PHP
<?php
|
|
/**
|
|
* @copyright Copyright (c) 2016, ownCloud, Inc.
|
|
*
|
|
* @author Johannes Ernst <jernst@indiecomputing.com>
|
|
* @author Lukas Reschke <lukas@statuscode.ch>
|
|
* @author Morris Jobke <hey@morrisjobke.de>
|
|
* @author Roeland Jago Douma <roeland@famdouma.nl>
|
|
*
|
|
* @license AGPL-3.0
|
|
*
|
|
* This code is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License, version 3,
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License, version 3,
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>
|
|
*
|
|
*/
|
|
|
|
namespace OC\Security;
|
|
use OC\AppFramework\Http\Request;
|
|
use OCP\IConfig;
|
|
|
|
/**
|
|
* Class TrustedDomain
|
|
*
|
|
* @package OC\Security
|
|
*/
|
|
class TrustedDomainHelper {
|
|
/** @var IConfig */
|
|
private $config;
|
|
|
|
/**
|
|
* @param IConfig $config
|
|
*/
|
|
public function __construct(IConfig $config) {
|
|
$this->config = $config;
|
|
}
|
|
|
|
/**
|
|
* Strips a potential port from a domain (in format domain:port)
|
|
* @param string $host
|
|
* @return string $host without appended port
|
|
*/
|
|
private function getDomainWithoutPort($host) {
|
|
$pos = strrpos($host, ':');
|
|
if ($pos !== false) {
|
|
$port = substr($host, $pos + 1);
|
|
if (is_numeric($port)) {
|
|
$host = substr($host, 0, $pos);
|
|
}
|
|
}
|
|
return $host;
|
|
}
|
|
|
|
/**
|
|
* Checks whether a domain is considered as trusted from the list
|
|
* of trusted domains. If no trusted domains have been configured, returns
|
|
* true.
|
|
* This is used to prevent Host Header Poisoning.
|
|
* @param string $domainWithPort
|
|
* @return bool true if the given domain is trusted or if no trusted domains
|
|
* have been configured
|
|
*/
|
|
public function isTrustedDomain($domainWithPort) {
|
|
$domain = $this->getDomainWithoutPort($domainWithPort);
|
|
|
|
// Read trusted domains from config
|
|
$trustedList = $this->config->getSystemValue('trusted_domains', []);
|
|
if (!is_array($trustedList)) {
|
|
return false;
|
|
}
|
|
|
|
// Always allow access from localhost
|
|
if (preg_match(Request::REGEX_LOCALHOST, $domain) === 1) {
|
|
return true;
|
|
}
|
|
// Reject misformed domains in any case
|
|
if (strpos($domain,'-') === 0 || strpos($domain,'..') !== false) {
|
|
return false;
|
|
}
|
|
// Match, allowing for * wildcards
|
|
foreach ($trustedList as $trusted) {
|
|
if (gettype($trusted) !== 'string') {
|
|
break;
|
|
}
|
|
$regex = '/^' . implode('[-\.a-zA-Z0-9]*', array_map(function($v) { return preg_quote($v, '/'); }, explode('*', $trusted))) . '$/';
|
|
if (preg_match($regex, $domain) || preg_match($regex, $domainWithPort)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
}
|