1 files changed, 85 insertions, 0 deletions
diff --git a/www/wiki/includes/ProxyLookup.php b/www/wiki/includes/ProxyLookup.php
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+<?php
+
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+use Wikimedia\IPSet;
+
+/**
+ * @since 1.28
+ */
+class ProxyLookup {
+
+	/**
+	 * @var string[]
+	 */
+	private $proxyServers;
+
+	/**
+	 * @var string[]
+	 */
+	private $proxyServersComplex;
+
+	/**
+	 * @var IPSet|null
+	 */
+	private $proxyIPSet;
+
+	/**
+	 * @param string[] $proxyServers Simple list of IPs
+	 * @param string[] $proxyServersComplex Complex list of IPs/ranges
+	 */
+	public function __construct( $proxyServers, $proxyServersComplex ) {
+		$this->proxyServers = $proxyServers;
+		$this->proxyServersComplex = $proxyServersComplex;
+	}
+
+	/**
+	 * Checks if an IP matches a proxy we've configured
+	 *
+	 * @param string $ip
+	 * @return bool
+	 */
+	public function isConfiguredProxy( $ip ) {
+		// Quick check of known singular proxy servers
+		if ( in_array( $ip, $this->proxyServers ) ) {
+			return true;
+		}
+
+		// Check against addresses and CIDR nets in the complex list
+		if ( !$this->proxyIPSet ) {
+			$this->proxyIPSet = new IPSet( $this->proxyServersComplex );
+		}
+		return $this->proxyIPSet->match( $ip );
+	}
+
+	/**
+	 * Checks if an IP is a trusted proxy provider.
+	 * Useful to tell if X-Forwarded-For data is possibly bogus.
+	 * CDN cache servers for the site are whitelisted.
+	 *
+	 * @param string $ip
+	 * @return bool
+	 */
+	public function isTrustedProxy( $ip ) {
+		$trusted = $this->isConfiguredProxy( $ip );
+		Hooks::run( 'IsTrustedProxy', [ &$ip, &$trusted ] );
+		return $trusted;
+	}
+}