snapshot of https://github.com/espocrm/espocrm.git (master, 2026-09-18; blobs > 131072B omitted)

application/Espo/Core/Utils/Security/UrlCheck.php

@@ -0,0 +1,192 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Utils\Security;
+
+class UrlCheck
+{
+    public function __construct(
+        private HostCheck $hostCheck,
+    ) {}
+
+    public function isUrl(string $url): bool
+    {
+        return filter_var($url, FILTER_VALIDATE_URL) !== false;
+    }
+
+    /**
+     * Checks whether it's a URL, and it does not follow to an internal host.
+     *
+     * @since 10.0.8
+     */
+    public function isUrlAndNotInternal(string $url): bool
+    {
+        if (!$this->isUrl($url)) {
+            return false;
+        }
+
+        $host = parse_url($url, PHP_URL_HOST);
+
+        if (!is_string($host)) {
+            return false;
+        }
+
+        return $this->hostCheck->isHostAndNotInternal($host);
+    }
+
+
+    /**
+     * Checks whether it's a URL, and it does not follow to an internal host.
+     *
+     * @since 9.3.4
+     * @deprecated Since 10.0.8.
+     * @todo Remove in v10.1.0.
+     */
+    public function isUrlAndNotIternal(string $url): bool
+    {
+        return $this->isUrlAndNotInternal($url);
+    }
+
+    /**
+     * @return ?string[] Null if not a domain name or not a URL.
+     * @internal
+     * @since 9.3.4
+     */
+    public function getCurlResolve(string $url): ?array
+    {
+        if (!$this->isUrl($url)) {
+            return null;
+        }
+
+        $host = parse_url($url, PHP_URL_HOST);
+        $port = parse_url($url, PHP_URL_PORT);
+        $scheme = parse_url($url, PHP_URL_SCHEME);
+
+        if ($port === null && $scheme) {
+            $port = match (strtolower($scheme)) {
+                'http' => 80,
+                'https'=> 443,
+                'ftp' => 21,
+                'ssh' => 22,
+                'smtp' => 25,
+                default  => null,
+            };
+        }
+
+        if ($port === null) {
+            return [];
+        }
+
+        if (!is_string($host)) {
+            return null;
+        }
+
+        if (filter_var($host, FILTER_VALIDATE_IP)) {
+            return null;
+        }
+
+        if (!$this->hostCheck->isDomainHost($host)) {
+            return null;
+        }
+
+        $ipAddresses = $this->hostCheck->getHostIpAddresses($host);
+
+        $output = [];
+
+        $hasIpV4 = false;
+
+        foreach ($ipAddresses as $ipAddress) {
+            if (filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+                $hasIpV4 = true;
+
+                break;
+            }
+        }
+
+        foreach ($ipAddresses as $ipAddress) {
+            $ipPart = $ipAddress;
+
+            if (filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
+                if ($hasIpV4) {
+                    continue;
+                }
+
+                $ipPart = "[$ipPart]";
+            }
+
+            $output[] = "$host:$port:$ipPart";
+        }
+
+        return $output;
+    }
+
+    /**
+     * @param string[] $resolve
+     * @param string[] $allowed An allowed address list in the `{host}:{port}` format.
+     * @internal
+     */
+    public function validateCurlResolveNotInternal(array $resolve, array $allowed = []): bool
+    {
+        if ($resolve === []) {
+            return false;
+        }
+
+        $ipAddresses = [];
+
+        foreach ($resolve as $item) {
+            $arr = explode(':', $item, 3);
+
+            if (count($arr) < 3) {
+                return false;
+            }
+
+            $ipAddress = $arr[2];
+            $port = $arr[1];
+            $domain = $arr[0];
+
+            if (in_array("$ipAddress:$port", $allowed) || in_array("$domain:$port", $allowed)) {
+                return true;
+            }
+
+            if (str_starts_with($ipAddress, '[') && str_ends_with($ipAddress, ']')) {
+                $ipAddress = substr($ipAddress, 1, -1);
+            }
+
+            $ipAddresses[] = $ipAddress;
+        }
+
+        foreach ($ipAddresses as $ipAddress) {
+            if (!$this->hostCheck->ipAddressIsNotInternal($ipAddress)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}