From a7d1313c14011bbc5290a1e9baf9c1f3f9e03af5 Mon Sep 17 00:00:00 2001
From: Julien Veyssier <julien-nc@posteo.net>
Date: Wed, 7 Dec 2022 16:26:26 +0100
Subject: manual backport of #35057

Signed-off-by: Julien Veyssier <julien-nc@posteo.net>
---
 .../DependencyInjection/DIContainer.php             |  3 ++-
 .../PublicShare/PublicShareMiddleware.php           | 21 ++++++++++++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

(limited to 'lib/private')

diff --git a/lib/private/AppFramework/DependencyInjection/DIContainer.php b/lib/private/AppFramework/DependencyInjection/DIContainer.php
index e06d5226a28..55278dabad5 100644
--- a/lib/private/AppFramework/DependencyInjection/DIContainer.php
+++ b/lib/private/AppFramework/DependencyInjection/DIContainer.php
@@ -301,7 +301,8 @@ class DIContainer extends SimpleContainer implements IAppContainer {
 				new OC\AppFramework\Middleware\PublicShare\PublicShareMiddleware(
 					$c->get(IRequest::class),
 					$c->get(ISession::class),
-					$c->get(\OCP\IConfig::class)
+					$c->get(\OCP\IConfig::class),
+					$c->get(OC\Security\Bruteforce\Throttler::class)
 				)
 			);
 			$dispatcher->registerMiddleware(
diff --git a/lib/private/AppFramework/Middleware/PublicShare/PublicShareMiddleware.php b/lib/private/AppFramework/Middleware/PublicShare/PublicShareMiddleware.php
index d3beb4fd3a8..f20bd333452 100644
--- a/lib/private/AppFramework/Middleware/PublicShare/PublicShareMiddleware.php
+++ b/lib/private/AppFramework/Middleware/PublicShare/PublicShareMiddleware.php
@@ -24,6 +24,7 @@
 namespace OC\AppFramework\Middleware\PublicShare;
 
 use OC\AppFramework\Middleware\PublicShare\Exceptions\NeedAuthenticationException;
+use OC\Security\Bruteforce\Throttler;
 use OCP\AppFramework\AuthPublicShareController;
 use OCP\AppFramework\Http\NotFoundResponse;
 use OCP\AppFramework\Middleware;
@@ -43,10 +44,14 @@ class PublicShareMiddleware extends Middleware {
 	/** @var IConfig */
 	private $config;
 
-	public function __construct(IRequest $request, ISession $session, IConfig $config) {
+	/** @var Throttler */
+	private $throttler;
+
+	public function __construct(IRequest $request, ISession $session, IConfig $config, Throttler $throttler) {
 		$this->request = $request;
 		$this->session = $session;
 		$this->config = $config;
+		$this->throttler = $throttler;
 	}
 
 	public function beforeController($controller, $methodName) {
@@ -54,6 +59,11 @@ class PublicShareMiddleware extends Middleware {
 			return;
 		}
 
+		$controllerClassPath = explode('\\', get_class($controller));
+		$controllerShortClass = end($controllerClassPath);
+		$bruteforceProtectionAction = $controllerShortClass . '::' . $methodName;
+		$this->throttler->sleepDelayOrThrowOnMax($this->request->getRemoteAddress(), $bruteforceProtectionAction);
+
 		if (!$this->isLinkSharingEnabled()) {
 			throw new NotFoundException('Link sharing is disabled');
 		}
@@ -68,6 +78,8 @@ class PublicShareMiddleware extends Middleware {
 		$controller->setToken($token);
 
 		if (!$controller->isValidToken()) {
+			$this->throttle($bruteforceProtectionAction, $token);
+
 			$controller->shareNotFound();
 			throw new NotFoundException();
 		}
@@ -88,6 +100,7 @@ class PublicShareMiddleware extends Middleware {
 			throw new NeedAuthenticationException();
 		}
 
+		$this->throttle($bruteforceProtectionAction, $token);
 		throw new NotFoundException();
 	}
 
@@ -128,4 +141,10 @@ class PublicShareMiddleware extends Middleware {
 
 		return true;
 	}
+
+	private function throttle($bruteforceProtectionAction, $token): void {
+		$ip = $this->request->getRemoteAddress();
+		$this->throttler->sleepDelay($ip, $bruteforceProtectionAction);
+		$this->throttler->registerAttempt($bruteforceProtectionAction, $ip, ['token' => $token]);
+	}
 }
-- 
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