86 lines
2.7 KiB
PHP
86 lines
2.7 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\DAV\Connector\Sabre;
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use Sabre\CalDAV\Principal\User;
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use Sabre\DAV\Exception\NotFound;
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use Sabre\DAV\INode;
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use \Sabre\DAV\PropFind;
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/**
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* Class DavAclPlugin is a wrapper around \Sabre\DAVACL\Plugin that returns 404
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* responses in case the resource to a response has been forbidden instead of
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* a 403. This is used to prevent enumeration of valid resources.
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*
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* @see https://github.com/owncloud/core/issues/22578
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* @package OCA\DAV\Connector\Sabre
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*/
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class DavAclPlugin extends \Sabre\DAVACL\Plugin {
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public function __construct() {
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$this->hideNodesFromListings = true;
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$this->allowUnauthenticatedAccess = false;
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}
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function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true) {
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$access = parent::checkPrivileges($uri, $privileges, $recursion, false);
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if($access === false && $throwExceptions) {
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/** @var INode $node */
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$node = $this->server->tree->getNodeForPath($uri);
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switch(get_class($node)) {
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case 'OCA\DAV\CardDAV\AddressBook':
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$type = 'Addressbook';
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break;
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default:
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$type = 'Node';
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break;
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}
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throw new NotFound(
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sprintf(
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"%s with name '%s' could not be found",
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$type,
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$node->getName()
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)
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);
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}
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return $access;
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}
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public function propFind(PropFind $propFind, INode $node) {
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// If the node is neither readable nor writable then fail unless its of
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// the standard user-principal
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if(!($node instanceof User)) {
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$path = $propFind->getPath();
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$readPermissions = $this->checkPrivileges($path, '{DAV:}read', self::R_PARENT, false);
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$writePermissions = $this->checkPrivileges($path, '{DAV:}write', self::R_PARENT, false);
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if ($readPermissions === false && $writePermissions === false) {
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$this->checkPrivileges($path, '{DAV:}read', self::R_PARENT, true);
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$this->checkPrivileges($path, '{DAV:}write', self::R_PARENT, true);
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}
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}
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return parent::propFind($propFind, $node);
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}
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}
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