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<?php
declare(strict_types=1);
/*
* @copyright 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Security;
use OC\Net\HostnameClassifier;
use OC\Net\IpAddressClassifier;
use OCP\IConfig;
use OCP\Security\IRemoteHostValidator;
use Psr\Log\LoggerInterface;
use function strpos;
use function strtolower;
use function substr;
use function urldecode;
/**
* @internal
*/
final class RemoteHostValidator implements IRemoteHostValidator {
private IConfig $config;
private HostnameClassifier $hostnameClassifier;
private IpAddressClassifier $ipAddressClassifier;
private LoggerInterface $logger;
public function __construct(IConfig $config,
HostnameClassifier $hostnameClassifier,
IpAddressClassifier $ipAddressClassifier,
LoggerInterface $logger) {
$this->config = $config;
$this->hostnameClassifier = $hostnameClassifier;
$this->ipAddressClassifier = $ipAddressClassifier;
$this->logger = $logger;
}
public function isValid(string $host): bool {
if ($this->config->getSystemValueBool('allow_local_remote_servers', false)) {
return true;
}
$host = idn_to_utf8(strtolower(urldecode($host)));
// Remove brackets from IPv6 addresses
if (strpos($host, '[') === 0 && substr($host, -1) === ']') {
$host = substr($host, 1, -1);
}
if ($this->hostnameClassifier->isLocalHostname($host)
|| $this->ipAddressClassifier->isLocalAddress($host)) {
$this->logger->warning("Host $host was not connected to because it violates local access rules");
return false;
}
return true;
}
}
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