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<?php |
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/** |
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* DNSOverHTTPS |
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* |
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* MIT License |
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* |
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* Copyright (c) 2018 wutno (#/g/punk - Rizon) |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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namespace Zwartpet\PHPCertificateToolbox\DNSValidator; |
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use GuzzleHttp\Client; |
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use Zwartpet\PHPCertificateToolbox\Exception\RuntimeException; |
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use GuzzleHttp\Exception\BadResponseException; |
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/** |
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* DNSOverHTTPS implements DNSValidatorInterface using Google's DNS-over-HTTPS service |
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* @package Zwartpet\PHPCertificateToolbox\DNSValidator |
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*/ |
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class DNSOverHTTPS implements DNSValidatorInterface |
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{ |
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const DNS_GOOGLE = 'https://dns.google.com/resolve'; |
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const DNS_MOZILLA = 'https://mozilla.cloudflare-dns.com/dns-query'; |
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const DNS_CLOUDFLARE = 'https://cloudflare-dns.com/dns-query'; |
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/** |
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* What DNS-over-HTTPS service to use |
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* |
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* @var null|string |
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*/ |
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private $baseURI; |
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/** |
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* Guzzle client handler |
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* |
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* @var Client object |
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*/ |
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private $client; |
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/** |
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* DNSOverHTTPS constructor. |
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* @param string|null $baseURI |
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*/ |
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public function __construct(string $baseURI = null) |
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{ |
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//Default to Google, seems like a safe bet... |
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if ($baseURI === null) { |
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$this->baseURI = self::DNS_GOOGLE; |
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} else { |
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$this->baseURI = $baseURI; |
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} |
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$this->client = new Client([ |
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'base_uri' => $this->baseURI |
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]); |
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} |
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public function checkChallenge($domain, $requiredDigest) : bool |
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{ |
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$hostname = '_acme-challenge.' . str_replace('*.', '', $domain); |
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$records = $this->get($hostname, 'TXT'); |
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if ($records->Status == 0) { |
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foreach ($records->Answer as $record) { |
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if ((rtrim($record->name, ".") == $hostname) && |
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($record->type == 16) && |
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(trim($record->data, '"') == $requiredDigest)) { |
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return true; |
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} |
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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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* @param string $name |
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* @param string $type per experimental spec this can be string OR int, we force string |
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* @return \stdClass |
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*/ |
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public function get(string $name, string $type) : \stdClass |
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{ |
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$query = [ |
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'query' => [ |
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'name' => $name, |
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'type' => $type, |
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'edns_client_subnet' => '0.0.0.0/0', //disable geotagged dns results |
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'ct' => 'application/dns-json', //cloudflare requires this |
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], |
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'headers' => [ |
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'Accept' => 'application/dns-json' |
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] |
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]; |
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try { |
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$response = $this->client->get(null, $query); |
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} catch (BadResponseException $e) { |
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throw new RuntimeException("GET {$this->baseURI} failed", 0, $e); |
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} |
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$decode = json_decode($response->getBody()); |
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if (json_last_error() !== JSON_ERROR_NONE) { |
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throw new RuntimeException( |
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'Attempted to decode expected JSON response, however server returned something unexpected.' |
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); |
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} |
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return $decode; |
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} |
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} |
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Zwartpet /
php-certificate-toolbox
