fix(carddav): limit vcard size

Signed-off-by: SebastianKrupinski <krupinskis05@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/apps/dav/lib/CardDAV/Validation/CardDavValidatePlugin.php b/apps/dav/lib/CardDAV/Validation/CardDavValidatePlugin.php
new file mode 100644
index 00000000000..635ab6fcc78
--- /dev/null
+++ b/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;
+	}
+
+}