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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Johannes Ernst <jernst@indiecomputing.com>
* @author Julius Härtl <jus@bitgrid.net>
* @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(string $host): string {
$pos = strrpos($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(string $domainWithPort): bool {
// overwritehost is always trusted
if ($this->config->getSystemValue('overwritehost') !== '') {
return true;
}
$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('*', $trusted))) . '$/i';
if (preg_match($regex, $domain) || preg_match($regex, $domainWithPort)) {
return true;
}
}
return false;
}
}
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