Block old legacy clients

apps/files/appinfo/remote.php

@@ -43,6 +43,7 @@
 
 // Load plugins
 $defaults = new OC_Defaults();
+$server->addPlugin(new \OC\Connector\Sabre\BlockLegacyClientPlugin(\OC::$server->getConfig()));
 $server->addPlugin(new \Sabre\DAV\Auth\Plugin($authBackend, $defaults->getName()));
 // FIXME: The following line is a workaround for legacy components relying on being able to send a GET to /
 $server->addPlugin(new \OC\Connector\Sabre\DummyGetResponsePlugin());

config/config.sample.php

@@ -799,6 +799,17 @@
  */
 'cipher' => 'AES-256-CFB',
 
+/**
+ * The minimum ownCloud desktop client version that will be allowed to sync with
+ * this server instance. All connections made from earlier clients will be denied
+ * by the server. Defaults to the minimum officially supported ownCloud version at
+ * the time of release of this server version.
+ *
+ * When changing this, note that older unsupported versions of the ownCloud desktop
+ * client may not function as expected, and could lead to permanent data loss for
+ * clients or other unexpected results.
+ */
+'minimum.supported.desktop.version' => '1.7.0',
 
 /**
  * Memory caching backend configuration

lib/private/connector/sabre/blocklegacyclientplugin.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * @author Lukas Reschke <[email protected]>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Connector\Sabre;
+
+use OCP\IConfig;
+use Sabre\HTTP\RequestInterface;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\Exception;
+
+/**
+ * Class BlockLegacyClientPlugin is used to detect old legacy sync clients and
+ * returns a 403 status to those clients
+ *
+ * @package OC\Connector\Sabre
+ */
+class BlockLegacyClientPlugin extends ServerPlugin {
+	/** @var \Sabre\DAV\Server */
+	protected $server;
+	/** @var IConfig */
+	protected $config;
+
+	/**
+	 * @param IConfig $config
+	 */
+	public function __construct(IConfig $config) {
+		$this->config = $config;
+	}
+
+	/**
+	 * @param \Sabre\DAV\Server $server
+	 * @return void
+	 */
+	public function initialize(\Sabre\DAV\Server $server) {
+		$this->server = $server;
+		$this->server->on('beforeMethod', [$this, 'beforeHandler'], 200);
+	}
+
+	/**
+	 * Detects all unsupported clients and throws a \Sabre\DAV\Exception\Forbidden
+	 * exception which will result in a 403 to them.
+	 * @param RequestInterface $request
+	 * @throws \Sabre\DAV\Exception\Forbidden If the client version is not supported
+	 */
+	public function beforeHandler(RequestInterface $request) {
+		$userAgent = $request->getHeader('User-Agent');
+		if($userAgent === null) {
+			return;
+		}
+
+		$minimumSupportedDesktopVersion = $this->config->getSystemValue('minimum.supported.desktop.version', '1.7.0');
+
+		// Match on the mirall version which is in scheme "Mozilla/5.0 (%1) mirall/%2" or
+		// "mirall/%1" for older releases
+		preg_match("/(?:mirall\\/)([\d.]+)/i", $userAgent, $versionMatches);
+		if(isset($versionMatches[1]) &&
+			version_compare($versionMatches[1], $minimumSupportedDesktopVersion) === -1) {
+			throw new \Sabre\DAV\Exception\Forbidden('Unsupported client version.');
+		}
+	}
+}

tests/lib/connector/sabre/BlockLegacyClientPluginTest.php

@@ -0,0 +1,129 @@
+<?php
+/**
+ * @author Lukas Reschke <[email protected]>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace Test\Connector\Sabre;
+
+use OC\Connector\Sabre\BlockLegacyClientPlugin;
+use Test\TestCase;
+use OCP\IConfig;
+
+/**
+ * Class BlockLegacyClientPluginTest
+ *
+ * @package Test\Connector\Sabre
+ */
+class BlockLegacyClientPluginTest extends TestCase {
+	/** @var IConfig */
+	private $config;
+	/** @var BlockLegacyClientPlugin */
+	private $blockLegacyClientVersionPlugin;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->config = $this->getMock('\OCP\IConfig');
+		$this->blockLegacyClientVersionPlugin = new BlockLegacyClientPlugin($this->config);
+	}
+
+	/**
+	 * @return array
+	 */
+	public function oldDesktopClientProvider() {
+		return [
+			['Mozilla/5.0 (1.5.0) mirall/1.5.0'],
+			['mirall/1.5.0'],
+			['mirall/1.5.4'],
+			['mirall/1.6.0'],
+			['Mozilla/5.0 (Bogus Text) mirall/1.6.9'],
+		];
+	}
+
+	/**
+	 * @dataProvider oldDesktopClientProvider
+	 * @param string $userAgent
+	 * @expectedException \Sabre\DAV\Exception\Forbidden
+	 * @expectedExceptionMessage Unsupported client version.
+	 */
+	public function testBeforeHandlerException($userAgent) {
+		/** @var \Sabre\HTTP\RequestInterface $request */
+		$request = $this->getMock('\Sabre\HTTP\RequestInterface');
+		$request
+			->expects($this->once())
+			->method('getHeader')
+			->with('User-Agent')
+			->will($this->returnValue($userAgent));
+
+		$this->config
+			->expects($this->once())
+			->method('getSystemValue')
+			->with('minimum.supported.desktop.version', '1.7.0')
+			->will($this->returnValue('1.7.0'));
+
+		$this->blockLegacyClientVersionPlugin->beforeHandler($request);
+	}
+
+	/**
+	 * @return array
+	 */
+	public function newAndAlternateDesktopClientProvider() {
+		return [
+			['Mozilla/5.0 (1.7.0) mirall/1.7.0'],
+			['mirall/1.8.3'],
+			['mirall/1.7.2'],
+			['mirall/1.7.0'],
+			['Mozilla/5.0 (Bogus Text) mirall/1.9.3'],
+		];
+	}
+
+	/**
+	 * @dataProvider newAndAlternateDesktopClientProvider
+	 * @param string $userAgent
+	 */
+	public function testBeforeHandlerSuccess($userAgent) {
+		/** @var \Sabre\HTTP\RequestInterface $request */
+		$request = $this->getMock('\Sabre\HTTP\RequestInterface');
+		$request
+			->expects($this->once())
+			->method('getHeader')
+			->with('User-Agent')
+			->will($this->returnValue($userAgent));
+
+		$this->config
+			->expects($this->once())
+			->method('getSystemValue')
+			->with('minimum.supported.desktop.version', '1.7.0')
+			->will($this->returnValue('1.7.0'));
+
+		$this->blockLegacyClientVersionPlugin->beforeHandler($request);
+	}
+
+	public function testBeforeHandlerNoUserAgent() {
+		/** @var \Sabre\HTTP\RequestInterface $request */
+		$request = $this->getMock('\Sabre\HTTP\RequestInterface');
+		$request
+			->expects($this->once())
+			->method('getHeader')
+			->with('User-Agent')
+			->will($this->returnValue(null));
+		$this->blockLegacyClientVersionPlugin->beforeHandler($request);
+	}
+
+}