Throttle requests to unknown tokens

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/dav/appinfo/v2/direct.php

@@ -38,7 +38,10 @@ $server = $serverFactory->createServer(
 	$baseuri,
 	$requestUri,
 	\OC::$server->getRootFolder(),
-	\OC::$server->query(\OCA\DAV\Db\DirectMapper::class)
+	\OC::$server->query(\OCA\DAV\Db\DirectMapper::class),
+	\OC::$server->query(\OCP\AppFramework\Utility\ITimeFactory::class),
+	\OC::$server->getBruteForceThrottler(),
+	\OC::$server->getRequest()
 );
 
 $server->exec();

apps/dav/lib/Direct/DirectHome.php

@@ -24,10 +24,12 @@ declare(strict_types=1);
 
 namespace OCA\DAV\Direct;
 
+use OC\Security\Bruteforce\Throttler;
 use OCA\DAV\Db\DirectMapper;
 use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Files\IRootFolder;
+use OCP\IRequest;
 use Sabre\DAV\Exception\Forbidden;
 use Sabre\DAV\Exception\MethodNotAllowed;
 use Sabre\DAV\Exception\NotFound;
@@ -44,12 +46,22 @@ class DirectHome implements ICollection {
 	/** @var ITimeFactory */
 	private $timeFactory;
 
+	/** @var Throttler */
+	private $throttler;
+
+	/** @var IRequest */
+	private $request;
+
 	public function __construct(IRootFolder $rootFolder,
 								DirectMapper $mapper,
-								ITimeFactory $timeFactory) {
+								ITimeFactory $timeFactory,
+								Throttler $throttler,
+								IRequest $request) {
 		$this->rootFolder = $rootFolder;
 		$this->mapper = $mapper;
 		$this->timeFactory = $timeFactory;
+		$this->throttler = $throttler;
+		$this->request = $request;
 	}
 
 	public function createFile($name, $data = null) {
@@ -71,7 +83,9 @@ class DirectHome implements ICollection {
 
 			return new DirectFile($direct, $this->rootFolder);
 		} catch (DoesNotExistException $e) {
-			//TODO: throttle the ip to avoid brute forcing
+			// Since the token space is so huge only throttle on non exsisting token
+			$this->throttler->registerAttempt('directlink', $this->request->getRemoteAddress());
+			$this->throttler->sleepDelay($this->request->getRemoteAddress(), 'directlink');
 
 			throw new NotFound();
 		}

apps/dav/lib/Direct/ServerFactory.php

@@ -24,9 +24,12 @@ declare(strict_types=1);
 
 namespace OCA\DAV\Direct;
 
+use OC\Security\Bruteforce\Throttler;
 use OCA\DAV\Db\DirectMapper;
+use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Files\IRootFolder;
 use OCP\IConfig;
+use OCP\IRequest;
 
 class ServerFactory {
 	/** @var IConfig */
@@ -39,8 +42,11 @@ class ServerFactory {
 	public function createServer(string $baseURI,
 								 string $requestURI,
 								 IRootFolder $rootFolder,
-								 DirectMapper $mapper) {
-		$home = new DirectHome($rootFolder, $mapper);
+								 DirectMapper $mapper,
+								 ITimeFactory $timeFactory,
+								 Throttler $throttler,
+								 IRequest $request): Server {
+		$home = new DirectHome($rootFolder, $mapper, $timeFactory, $throttler, $request);
 		$server = new Server($home);
 
 		$server->httpRequest->setUrl($requestURI);