96 lines
2.9 KiB
PHP
96 lines
2.9 KiB
PHP
<?php
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/************************************************************************
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* This file is part of EspoCRM.
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*
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* EspoCRM – Open Source CRM application.
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* Copyright (C) 2014-2025 EspoCRM, Inc.
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* Website: https://www.espocrm.com
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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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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 <https://www.gnu.org/licenses/>.
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*
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* The interactive user interfaces in modified source and object code versions
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* of this program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU Affero General Public License version 3.
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*
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* In accordance with Section 7(b) of the GNU Affero General Public License version 3,
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* these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
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************************************************************************/
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namespace Espo\Core\Utils\Security;
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use const DNS_A;
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use const FILTER_FLAG_NO_PRIV_RANGE;
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use const FILTER_FLAG_NO_RES_RANGE;
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use const FILTER_VALIDATE_IP;
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use const FILTER_VALIDATE_URL;
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use const PHP_URL_HOST;
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class UrlCheck
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{
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public function isUrl(string $url): bool
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{
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return filter_var($url, FILTER_VALIDATE_URL) !== false;
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}
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/**
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* Checks whether a URL does not follow to an internal host.
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*/
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public function isNotInternalUrl(string $url): bool
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{
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if (!$this->isUrl($url)) {
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return false;
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}
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$host = parse_url($url, PHP_URL_HOST);
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if (!is_string($host)) {
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return false;
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}
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$records = dns_get_record($host, DNS_A);
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if (filter_var($host, FILTER_VALIDATE_IP)) {
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return $this->ipAddressIsNotInternal($host);
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}
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if (!$records) {
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return false;
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}
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foreach ($records as $record) {
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/** @var ?string $idAddress */
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$idAddress = $record['ip'] ?? null;
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if (!$idAddress) {
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return false;
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}
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if (!$this->ipAddressIsNotInternal($idAddress)) {
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return false;
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}
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}
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return true;
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}
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private function ipAddressIsNotInternal(string $ipAddress): bool
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{
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return (bool) filter_var(
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$ipAddress,
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FILTER_VALIDATE_IP,
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FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE
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);
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}
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}
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