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<?php |
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/** |
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* @copyright Copyright (c) 2016 Morris Jobke <[email protected]> |
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* |
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* @license GNU AGPL version 3 or any later version |
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* |
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* This program 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 as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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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 |
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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\FilesAccessControl; |
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use OCP\Files\ForbiddenException; |
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use OCP\IL10N; |
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use OCP\WorkflowEngine\IManager; |
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use OCP\WorkflowEngine\IOperation; |
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class Operation implements IOperation{ |
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/** @var IManager */ |
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protected $manager; |
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/** @var IL10N */ |
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protected $l; |
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/** @var int */ |
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protected $nestingLevel = 0; |
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/** |
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* @param IManager $manager |
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* @param IL10N $l |
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*/ |
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public function __construct(IManager $manager, IL10N $l) { |
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$this->manager = $manager; |
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$this->l = $l; |
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} |
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/** |
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* @param StorageWrapper $storage |
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* @param string $path |
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* @throws ForbiddenException |
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*/ |
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public function checkFileAccess(StorageWrapper $storage, $path) { |
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if (!$this->isBlockablePath($storage, $path) || $this->isCreatingSkeletonFiles() || $this->nestingLevel !== 0) { |
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// Allow creating skeletons and theming |
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// https://github.com/nextcloud/files_accesscontrol/issues/5 |
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// https://github.com/nextcloud/files_accesscontrol/issues/12 |
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return; |
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} |
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$this->nestingLevel++; |
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$filePath = $this->translatePath($storage, $path); |
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$this->manager->setFileInfo($storage, $filePath); |
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$match = $this->manager->getMatchingOperations('OCA\FilesAccessControl\Operation'); |
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$this->nestingLevel--; |
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if (!empty($match)) { |
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// All Checks of one operation matched: prevent access |
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throw new ForbiddenException('Access denied', true); |
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} |
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} |
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/** |
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* @param StorageWrapper $storage |
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* @param string $path |
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* @return bool |
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*/ |
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protected function isBlockablePath(StorageWrapper $storage, $path) { |
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$fullPath = $storage->mountPoint . $path; |
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if (substr_count($fullPath, '/') < 3) { |
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return false; |
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} |
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// '', admin, 'files', 'path/to/file.txt' |
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$segment = explode('/', $fullPath, 4); |
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return isset($segment[2]) && in_array($segment[2], [ |
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'files', |
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'thumbnails', |
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'files_versions', |
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]); |
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} |
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/** |
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* For thumbnails and versions we want to check the tags of the original file |
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* |
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* @param StorageWrapper $storage |
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* @param string $path |
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* @return bool |
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*/ |
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protected function translatePath(StorageWrapper $storage, $path) { |
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if (substr_count($path, '/') < 1) { |
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return $path; |
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} |
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// 'files', 'path/to/file.txt' |
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list($folder, $innerPath) = explode('/', $path, 2); |
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if ($folder === 'files_versions') { |
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$innerPath = substr($innerPath, 0, strrpos($innerPath, '.v')); |
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return 'files/' . $innerPath; |
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} else if ($folder === 'thumbnails') { |
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list($fileId,) = explode('/', $innerPath, 2); |
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$innerPath = $storage->getCache()->getPathById($fileId); |
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if ($innerPath !== null) { |
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return 'files/' . $innerPath; |
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} |
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} |
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return $path; |
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} |
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/** |
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* Check if we are in the LoginController and if so, ignore the firewall |
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* @return bool |
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*/ |
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protected function isCreatingSkeletonFiles() { |
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$exception = new \Exception(); |
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$trace = $exception->getTrace(); |
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foreach ($trace as $step) { |
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if (isset($step['class']) && $step['class'] === 'OC\Core\Controller\LoginController' && |
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isset($step['function']) && $step['function'] === 'tryLogin') { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param string $name |
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* @param array[] $checks |
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* @param string $operation |
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* @throws \UnexpectedValueException |
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*/ |
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public function validateOperation($name, array $checks, $operation) { |
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if (empty($checks)) { |
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throw new \UnexpectedValueException($this->l->t('No rule given')); |
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} |
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} |
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} |
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nextcloud /
files_accesscontrol
