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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 IPLib\Address\IPv6; |
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use IPLib\Factory; |
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use IPLib\ParseStringFlag; |
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use OCP\Http\Client\LocalServerException; |
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use Psr\Log\LoggerInterface; |
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use Symfony\Component\HttpFoundation\IpUtils; |
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class LocalAddressChecker { |
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private LoggerInterface $logger; |
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public function __construct(LoggerInterface $logger) { |
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$this->logger = $logger; |
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} |
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public function throwIfLocalIp(string $ip) : void { |
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$parsedIp = Factory::parseAddressString( |
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$ip, |
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ParseStringFlag::IPV4_MAYBE_NON_DECIMAL | ParseStringFlag::IPV4ADDRESS_MAYBE_NON_QUAD_DOTTED |
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); |
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if ($parsedIp === null) { |
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/* Not an IP */ |
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return; |
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} |
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/* Replace by normalized form */ |
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if ($parsedIp instanceof IPv6) { |
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$ip = (string)($parsedIp->toIPv4() ?? $parsedIp); |
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} else { |
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$ip = (string)$parsedIp; |
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} |
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$localRanges = [ |
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'100.64.0.0/10', // See RFC 6598 |
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'192.0.0.0/24', // See RFC 6890 |
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]; |
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if ( |
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(bool)filter_var($ip, FILTER_VALIDATE_IP) && |
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( |
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!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) || |
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IpUtils::checkIp($ip, $localRanges) |
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)) { |
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$this->logger->warning("Host $ip was not connected to because it violates local access rules"); |
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throw new LocalServerException('Host violates local access rules'); |
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} |
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} |
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public function throwIfLocalAddress(string $uri) : void { |
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$host = parse_url($uri, PHP_URL_HOST); |
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if ($host === false || $host === null) { |
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$this->logger->warning("Could not detect any host in $uri"); |
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throw new LocalServerException('Could not detect any host'); |
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} |
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$host = idn_to_utf8(strtolower(urldecode($host))); |
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// Remove brackets from IPv6 addresses |
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if (strpos($host, '[') === 0 && substr($host, -1) === ']') { |
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$host = substr($host, 1, -1); |
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} |
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// Disallow local network top-level domains from RFC 6762 |
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$localTopLevelDomains = ['local','localhost','intranet','internal','private','corp','home','lan']; |
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$topLevelDomain = substr((strrchr($host, '.') ?: ''), 1); |
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if (in_array($topLevelDomain, $localTopLevelDomains)) { |
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$this->logger->warning("Host $host was not connected to because it violates local access rules"); |
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throw new LocalServerException('Host violates local access rules'); |
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} |
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// Disallow hostname only |
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if (substr_count($host, '.') === 0 && !(bool)filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) { |
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$this->logger->warning("Host $host was not connected to because it violates local access rules"); |
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throw new LocalServerException('Host violates local access rules'); |
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} |
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$this->throwIfLocalIp($host); |
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} |
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} |
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nextcloud /
server
