fix(carddav): limit vcard size

Signed-off-by: SebastianKrupinski <[email protected]>

apps/dav/appinfo/v1/carddav.php

@@ -33,6 +33,7 @@
 use OCA\DAV\CardDAV\AddressBookRoot;
 use OCA\DAV\CardDAV\CardDavBackend;
 use OCA\DAV\CardDAV\Security\CardDavRateLimitingPlugin;
+use OCA\DAV\CardDAV\Validation\CardDavValidatePlugin;
 use OCA\DAV\Connector\LegacyDAVACL;
 use OCA\DAV\Connector\Sabre\Auth;
 use OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin;
@@ -105,6 +106,7 @@
 )));
 $server->addPlugin(new ExceptionLoggerPlugin('carddav', \OC::$server->get(LoggerInterface::class)));
 $server->addPlugin(\OCP\Server::get(CardDavRateLimitingPlugin::class));
+$server->addPlugin(\OCP\Server::get(CardDavValidatePlugin::class));
 
 // And off we go!
 $server->exec();

apps/dav/composer/composer/autoload_classmap.php

@@ -133,6 +133,7 @@
     'OCA\\DAV\\CardDAV\\SyncService' => $baseDir . '/../lib/CardDAV/SyncService.php',
     'OCA\\DAV\\CardDAV\\SystemAddressbook' => $baseDir . '/../lib/CardDAV/SystemAddressbook.php',
     'OCA\\DAV\\CardDAV\\UserAddressBooks' => $baseDir . '/../lib/CardDAV/UserAddressBooks.php',
+    'OCA\\DAV\\CardDAV\\Validation\\CardDavValidatePlugin' => $baseDir . '/../lib/CardDAV/Validation/CardDavValidatePlugin.php',
     'OCA\\DAV\\CardDAV\\Xml\\Groups' => $baseDir . '/../lib/CardDAV/Xml/Groups.php',
     'OCA\\DAV\\Command\\CreateAddressBook' => $baseDir . '/../lib/Command/CreateAddressBook.php',
     'OCA\\DAV\\Command\\CreateCalendar' => $baseDir . '/../lib/Command/CreateCalendar.php',

apps/dav/composer/composer/autoload_static.php

@@ -148,6 +148,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\CardDAV\\SyncService' => __DIR__ . '/..' . '/../lib/CardDAV/SyncService.php',
         'OCA\\DAV\\CardDAV\\SystemAddressbook' => __DIR__ . '/..' . '/../lib/CardDAV/SystemAddressbook.php',
         'OCA\\DAV\\CardDAV\\UserAddressBooks' => __DIR__ . '/..' . '/../lib/CardDAV/UserAddressBooks.php',
+        'OCA\\DAV\\CardDAV\\Validation\\CardDavValidatePlugin' => __DIR__ . '/..' . '/../lib/CardDAV/Validation/CardDavValidatePlugin.php',
         'OCA\\DAV\\CardDAV\\Xml\\Groups' => __DIR__ . '/..' . '/../lib/CardDAV/Xml/Groups.php',
         'OCA\\DAV\\Command\\CreateAddressBook' => __DIR__ . '/..' . '/../lib/Command/CreateAddressBook.php',
         'OCA\\DAV\\Command\\CreateCalendar' => __DIR__ . '/..' . '/../lib/Command/CreateCalendar.php',

apps/dav/lib/CardDAV/Validation/CardDavValidatePlugin.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\DAV\CardDAV\Validation;
+
+use OCA\DAV\AppInfo\Application;
+use OCP\IAppConfig;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+class CardDavValidatePlugin extends ServerPlugin {
+
+	public function __construct(
+		private IAppConfig $config
+	) {
+	}
+
+	public function initialize(Server $server): void {
+		$server->on('beforeMethod:PUT', [$this, 'beforePut']);
+	}
+
+	public function beforePut(RequestInterface $request, ResponseInterface $response): bool {
+		// evaluate if card size exceeds defined limit
+		$cardSizeLimit = $this->config->getValueInt(Application::APP_ID, 'card_size_limit', 5242880);
+		if ((int) $request->getRawServerValue('CONTENT_LENGTH') > $cardSizeLimit) {
+			throw new Forbidden("VCard object exceeds $cardSizeLimit bytes");
+		}
+		// all tests passed return true
+		return true;
+	}
+
+}

apps/dav/lib/Server.php

@@ -44,6 +44,7 @@
 use OCA\DAV\CardDAV\MultiGetExportPlugin;
 use OCA\DAV\CardDAV\PhotoCache;
 use OCA\DAV\CardDAV\Security\CardDavRateLimitingPlugin;
+use OCA\DAV\CardDAV\Validation\CardDavValidatePlugin;
 use OCA\DAV\Comments\CommentsPlugin;
 use OCA\DAV\Connector\Sabre\AnonymousOptionsPlugin;
 use OCA\DAV\Connector\Sabre\Auth;
@@ -211,6 +212,7 @@ public function __construct(IRequest $request, string $baseUri) {
 			));
 
 			$this->server->addPlugin(\OCP\Server::get(CardDavRateLimitingPlugin::class));
+			$this->server->addPlugin(\OCP\Server::get(CardDavValidatePlugin::class));
 		}
 
 		// system tags plugins

apps/dav/tests/unit/CardDAV/Validation/CardDavValidatePluginTest.php

@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Tests\unit\CardDAV\Validation;
+
+use OCA\DAV\CardDAV\Validation\CardDavValidatePlugin;
+use OCP\IAppConfig;
+use PHPUnit\Framework\MockObject\MockObject;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Test\TestCase;
+
+class CardDavValidatePluginTest extends TestCase {
+
+	private CardDavValidatePlugin $plugin;
+	private IAppConfig|MockObject $config;
+	private RequestInterface|MockObject $request;
+	private ResponseInterface|MockObject $response;
+
+	protected function setUp(): void {
+		parent::setUp();
+		// construct mock objects
+		$this->config = $this->createMock(IAppConfig::class);
+		$this->request = $this->createMock(RequestInterface::class);
+		$this->response = $this->createMock(ResponseInterface::class);
+		$this->plugin = new CardDavValidatePlugin(
+			$this->config,
+		);
+	}
+
+	public function testPutSizeLessThenLimit(): void {
+
+		// construct method responses
+		$this->config
+			->method('getValueInt')
+			->with('dav', 'card_size_limit', 5242880)
+			->willReturn(5242880);
+		$this->request
+			->method('getRawServerValue')
+			->with('CONTENT_LENGTH')
+			->willReturn('1024');
+		// test condition
+		$this->assertTrue(
+			$this->plugin->beforePut($this->request, $this->response)
+		);
+
+	}
+
+	public function testPutSizeMoreThenLimit(): void {
+
+		// construct method responses
+		$this->config
+			->method('getValueInt')
+			->with('dav', 'card_size_limit', 5242880)
+			->willReturn(5242880);
+		$this->request
+			->method('getRawServerValue')
+			->with('CONTENT_LENGTH')
+			->willReturn('6242880');
+		$this->expectException(Forbidden::class);
+		// test condition
+		$this->plugin->beforePut($this->request, $this->response);
+
+	}
+
+}