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