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HostnameClassifier.php 1.8 KB

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  1. <?php
  2. declare(strict_types=1);
  3. /*
  4. * @copyright 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
  5. *
  6. * @author 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
  7. *
  8. * @license GNU AGPL version 3 or any later version
  9. *
  10. * This program is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU Affero General Public License as
  12. * published by the Free Software Foundation, either version 3 of the
  13. * License, or (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU Affero General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU Affero General Public License
  21. * along with this program. If not, see <http://www.gnu.org/licenses/>.
  22. */
  23. namespace OC\Net;
  24. use function filter_var;
  25. use function in_array;
  26. use function strrchr;
  27. use function substr;
  28. use function substr_count;
  29. /**
  30. * Classifier for network hostnames
  31. *
  32. * @internal
  33. */
  34. class HostnameClassifier {
  35. private const LOCAL_TOPLEVEL_DOMAINS = [
  36. 'local',
  37. 'localhost',
  38. 'intranet',
  39. 'internal',
  40. 'private',
  41. 'corp',
  42. 'home',
  43. 'lan',
  44. ];
  45. /**
  46. * Check host identifier for local hostname
  47. *
  48. * IP addresses are not considered local. Use the IpAddressClassifier for those.
  49. */
  50. public function isLocalHostname(string $hostname): bool {
  51. // Disallow local network top-level domains from RFC 6762
  52. $topLevelDomain = substr((strrchr($hostname, '.') ?: ''), 1);
  53. if (in_array($topLevelDomain, self::LOCAL_TOPLEVEL_DOMAINS)) {
  54. return true;
  55. }
  56. // Disallow hostname only
  57. if (substr_count($hostname, '.') === 0 && !filter_var($hostname, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
  58. return true;
  59. }
  60. return false;
  61. }
  62. }