aboutsummaryrefslogtreecommitdiffstats
path: root/apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php
diff options
context:
space:
mode:
Diffstat (limited to 'apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php')
-rw-r--r--apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php111
1 files changed, 111 insertions, 0 deletions
diff --git a/apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php b/apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php
new file mode 100644
index 00000000000..8ee4c9cb4d3
--- /dev/null
+++ b/apps/dav/lib/CalDAV/Security/RateLimitingPlugin.php
@@ -0,0 +1,111 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\CalDAV\Security;
+
+use OC\Security\RateLimiting\Exception\RateLimitExceededException;
+use OC\Security\RateLimiting\Limiter;
+use OCA\DAV\CalDAV\CalDavBackend;
+use OCA\DAV\Connector\Sabre\Exception\TooManyRequests;
+use OCP\IAppConfig;
+use OCP\IUserManager;
+use Psr\Log\LoggerInterface;
+use Sabre\DAV;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\ServerPlugin;
+use function count;
+use function explode;
+
+class RateLimitingPlugin extends ServerPlugin {
+
+ private Limiter $limiter;
+ private IUserManager $userManager;
+ private CalDavBackend $calDavBackend;
+ private IAppConfig $config;
+ private LoggerInterface $logger;
+ private ?string $userId;
+
+ public function __construct(Limiter $limiter,
+ IUserManager $userManager,
+ CalDavBackend $calDavBackend,
+ LoggerInterface $logger,
+ IAppConfig $config,
+ ?string $userId) {
+ $this->limiter = $limiter;
+ $this->userManager = $userManager;
+ $this->calDavBackend = $calDavBackend;
+ $this->config = $config;
+ $this->logger = $logger;
+ $this->userId = $userId;
+ }
+
+ public function initialize(DAV\Server $server): void {
+ $server->on('beforeBind', [$this, 'beforeBind'], 1);
+ }
+
+ public function beforeBind(string $path): void {
+ if ($this->userId === null) {
+ // We only care about authenticated users here
+ return;
+ }
+ $user = $this->userManager->get($this->userId);
+ if ($user === null) {
+ // We only care about authenticated users here
+ return;
+ }
+
+ $pathParts = explode('/', $path);
+ if (count($pathParts) === 3 && $pathParts[0] === 'calendars') {
+ // Path looks like calendars/username/calendarname so a new calendar or subscription is created
+ try {
+ $this->limiter->registerUserRequest(
+ 'caldav-create-calendar',
+ $this->config->getValueInt('dav', 'rateLimitCalendarCreation', 10),
+ $this->config->getValueInt('dav', 'rateLimitPeriodCalendarCreation', 3600),
+ $user
+ );
+ } catch (RateLimitExceededException $e) {
+ throw new TooManyRequests('Too many calendars created', 0, $e);
+ }
+
+ $calendarLimit = $this->config->getValueInt('dav', 'maximumCalendarsSubscriptions', 30);
+ if ($calendarLimit === -1) {
+ return;
+ }
+ $numCalendars = $this->calDavBackend->getCalendarsForUserCount('principals/users/' . $user->getUID());
+ $numSubscriptions = $this->calDavBackend->getSubscriptionsForUserCount('principals/users/' . $user->getUID());
+
+ if (($numCalendars + $numSubscriptions) >= $calendarLimit) {
+ $this->logger->warning('Maximum number of calendars/subscriptions reached', [
+ 'calendars' => $numCalendars,
+ 'subscription' => $numSubscriptions,
+ 'limit' => $calendarLimit,
+ ]);
+ throw new Forbidden('Calendar limit reached', 0);
+ }
+ }
+ }
+
+}