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application/Espo/Core/Authentication/Util/IpAddressUtil.php

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+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 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\Authentication\Util;
+
+use CIDRmatch\CIDRmatch;
+
+class IpAddressUtil
+{
+    /**
+     * @param string $ipAddress An IP address.
+     * @param string[] $whitelist A whitelist. IPs or IP ranges in CIDR notation.
+     */
+    public function isInWhitelist(string $ipAddress, array $whitelist): bool
+    {
+        $cidrMatch = new CIDRmatch();
+
+        foreach ($whitelist as $whiteIpAddress) {
+            if ($ipAddress === $whiteIpAddress) {
+                return true;
+            }
+
+            if (
+                str_contains($whiteIpAddress, '/') &&
+                $cidrMatch->match($ipAddress, $whiteIpAddress)
+            ) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}