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<?php
/**
* Copyright (c) 2015 Lukas Reschke <lukas@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
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
*/
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;
}
// TODO: Workaround for older instances still with port applied. Remove for ownCloud 9.
if(in_array($domainWithPort, $trustedList)) {
return true;
}
// Always allow access from localhost
if (preg_match(Request::REGEX_LOCALHOST, $domain) === 1) {
return true;
}
return in_array($domain, $trustedList);
}
}
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