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<?php |
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declare(strict_types=1); |
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/** |
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* @copyright Copyright (c) 2021, Lukas Reschke <[email protected]> |
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* |
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* @author Lukas Reschke <[email protected]> |
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* |
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* @license GNU AGPL version 3 or any later version |
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* |
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* This program 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 as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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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 |
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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\Http\Client; |
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use Psr\Http\Message\RequestInterface; |
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class DnsPinMiddleware { |
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/** @var NegativeDnsCache */ |
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private $negativeDnsCache; |
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/** @var LocalAddressChecker */ |
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private $localAddressChecker; |
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public function __construct( |
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NegativeDnsCache $negativeDnsCache, |
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LocalAddressChecker $localAddressChecker |
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) { |
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$this->negativeDnsCache = $negativeDnsCache; |
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$this->localAddressChecker = $localAddressChecker; |
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} |
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private function dnsResolve(string $target, int $recursionCount) : array { |
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if ($recursionCount >= 10) { |
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return []; |
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} |
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$recursionCount = $recursionCount++; |
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$targetIps = []; |
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$soaDnsEntry = dns_get_record($target, DNS_SOA); |
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if (isset($soaDnsEntry[0]) && isset($soaDnsEntry[0]['minimum-ttl'])) { |
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$dnsNegativeTtl = $soaDnsEntry[0]['minimum-ttl']; |
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} else { |
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$dnsNegativeTtl = null; |
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} |
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$dnsTypes = [DNS_A, DNS_AAAA, DNS_CNAME]; |
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foreach ($dnsTypes as $key => $dnsType) { |
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if ($this->negativeDnsCache->isNegativeCached($target, $dnsType)) { |
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unset($dnsTypes[$key]); |
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continue; |
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} |
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$dnsResponses = dns_get_record($target, $dnsType); |
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$canHaveCnameRecord = true; |
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if (count($dnsResponses) > 0) { |
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foreach ($dnsResponses as $key => $dnsResponse) { |
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if (isset($dnsResponse['ip'])) { |
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$targetIps[] = $dnsResponse['ip']; |
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$canHaveCnameRecord = false; |
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} elseif (isset($dnsResponse['ipv6'])) { |
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$targetIps[] = $dnsResponse['ipv6']; |
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$canHaveCnameRecord = false; |
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} elseif (isset($dnsResponse['target']) && $canHaveCnameRecord) { |
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$targetIps = array_merge($targetIps, $this->dnsResolve($dnsResponse['target'], $recursionCount)); |
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$canHaveCnameRecord = true; |
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} |
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} |
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} else { |
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if ($dnsNegativeTtl !== null) { |
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$this->negativeDnsCache->setNegativeCacheForDnsType($target, $dnsType, $dnsNegativeTtl); |
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} |
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} |
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} |
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return $targetIps; |
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} |
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public function addDnsPinning() { |
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return function (callable $handler) { |
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return function ( |
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RequestInterface $request, |
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array $options |
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) use ($handler) { |
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if ($options['nextcloud']['allow_local_address'] === true) { |
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return $handler($request, $options); |
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} |
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$hostName = (string)$request->getUri()->getHost(); |
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$port = $request->getUri()->getPort(); |
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$ports = [ |
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'80', |
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'443', |
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]; |
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if ($port !== null) { |
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$ports[] = (string)$port; |
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} |
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$targetIps = $this->dnsResolve($hostName, 0); |
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foreach ($targetIps as $ip) { |
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$this->localAddressChecker->ThrowIfLocalIp($ip); |
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foreach ($ports as $port) { |
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$curlEntry = $hostName . ':' . $port . ':' . $ip; |
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$options['curl'][CURLOPT_RESOLVE][] = $curlEntry; |
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} |
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} |
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return $handler($request, $options); |
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}; |
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}; |
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} |
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} |
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nextcloud /
server
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