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+<?php
+/**
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ *
+ * @author Björn Schießle <bjoern@schiessle.org>
+ * @author Christoph Wurst <christoph@winzerhof-wurst.at>
+ * @author Joas Schilling <coding@schilljs.com>
+ * @author Lukas Reschke <lukas@statuscode.ch>
+ * @author Maxence Lange <maxence@artificial-owl.com>
+ * @author Robin Appelman <robin@icewind.nl>
+ * @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ * @author Vincent Petry <vincent@nextcloud.com>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCA\DAV\Connector;
+
+use OCA\DAV\Connector\Sabre\PublicAuth;
+use OCP\IRequest;
+use OCP\ISession;
+use OCP\Security\Bruteforce\IThrottler;
+use OCP\Share\Exceptions\ShareNotFound;
+use OCP\Share\IManager;
+use OCP\Share\IShare;
+use Sabre\DAV\Auth\Backend\AbstractBasic;
+
+/**
+ * Class PublicAuth
+ *
+ * @package OCA\DAV\Connector
+ */
+class LegacyPublicAuth extends AbstractBasic {
+ private const BRUTEFORCE_ACTION = 'legacy_public_webdav_auth';
+
+ private ?IShare $share = null;
+ private IManager $shareManager;
+ private ISession $session;
+ private IRequest $request;
+ private IThrottler $throttler;
+
+ public function __construct(IRequest $request,
+ IManager $shareManager,
+ ISession $session,
+ IThrottler $throttler) {
+ $this->request = $request;
+ $this->shareManager = $shareManager;
+ $this->session = $session;
+ $this->throttler = $throttler;
+
+ // setup realm
+ $defaults = new \OCP\Defaults();
+ $this->realm = $defaults->getName();
+ }
+
+ /**
+ * Validates a username and password
+ *
+ * This method should return true or false depending on if login
+ * succeeded.
+ *
+ * @param string $username
+ * @param string $password
+ *
+ * @return bool
+ * @throws \Sabre\DAV\Exception\NotAuthenticated
+ */
+ protected function validateUserPass($username, $password) {
+ $this->throttler->sleepDelayOrThrowOnMax($this->request->getRemoteAddress(), self::BRUTEFORCE_ACTION);
+
+ try {
+ $share = $this->shareManager->getShareByToken($username);
+ } catch (ShareNotFound $e) {
+ $this->throttler->registerAttempt(self::BRUTEFORCE_ACTION, $this->request->getRemoteAddress());
+ return false;
+ }
+
+ $this->share = $share;
+
+ \OC_User::setIncognitoMode(true);
+
+ // check if the share is password protected
+ if ($share->getPassword() !== null) {
+ if ($share->getShareType() === IShare::TYPE_LINK
+ || $share->getShareType() === IShare::TYPE_EMAIL
+ || $share->getShareType() === IShare::TYPE_CIRCLE) {
+ if ($this->shareManager->checkPassword($share, $password)) {
+ return true;
+ } elseif ($this->session->exists(PublicAuth::DAV_AUTHENTICATED)
+ && $this->session->get(PublicAuth::DAV_AUTHENTICATED) === $share->getId()) {
+ return true;
+ } else {
+ if (in_array('XMLHttpRequest', explode(',', $this->request->getHeader('X-Requested-With')))) {
+ // do not re-authenticate over ajax, use dummy auth name to prevent browser popup
+ http_response_code(401);
+ header('WWW-Authenticate: DummyBasic realm="' . $this->realm . '"');
+ throw new \Sabre\DAV\Exception\NotAuthenticated('Cannot authenticate over ajax calls');
+ }
+
+ $this->throttler->registerAttempt(self::BRUTEFORCE_ACTION, $this->request->getRemoteAddress());
+ return false;
+ }
+ } elseif ($share->getShareType() === IShare::TYPE_REMOTE) {
+ return true;
+ } else {
+ $this->throttler->registerAttempt(self::BRUTEFORCE_ACTION, $this->request->getRemoteAddress());
+ return false;
+ }
+ }
+ return true;
+ }
+
+ public function getShare(): IShare {
+ assert($this->share !== null);
+ return $this->share;
+ }
+}