758 lines
21 KiB
PHP
758 lines
21 KiB
PHP
<?php
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/**
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* @author Björn Schießle <schiessle@owncloud.com>
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* @author Joas Schilling <nickvergessen@owncloud.com>
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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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 OC\Files\Storage\Wrapper;
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use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
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use OC\Encryption\Update;
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use OC\Encryption\Util;
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use OC\Files\Filesystem;
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use OC\Files\Mount\Manager;
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use OC\Files\Storage\LocalTempFileTrait;
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use OCP\Encryption\Exceptions\GenericEncryptionException;
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use OCP\Encryption\IFile;
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use OCP\Encryption\IManager;
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use OCP\Encryption\Keys\IStorage;
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use OCP\Files\Mount\IMountPoint;
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use OCP\Files\Storage;
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use OCP\ILogger;
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class Encryption extends Wrapper {
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use LocalTempFileTrait;
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/** @var string */
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private $mountPoint;
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/** @var \OC\Encryption\Util */
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private $util;
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/** @var \OCP\Encryption\IManager */
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private $encryptionManager;
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/** @var \OCP\ILogger */
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private $logger;
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/** @var string */
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private $uid;
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/** @var array */
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private $unencryptedSize;
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/** @var \OCP\Encryption\IFile */
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private $fileHelper;
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/** @var IMountPoint */
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private $mount;
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/** @var IStorage */
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private $keyStorage;
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/** @var Update */
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private $update;
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/** @var Manager */
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private $mountManager;
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/**
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* @param array $parameters
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* @param IManager $encryptionManager
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* @param Util $util
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* @param ILogger $logger
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* @param IFile $fileHelper
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* @param string $uid
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* @param IStorage $keyStorage
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* @param Update $update
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* @param Manager $mountManager
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*/
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public function __construct(
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$parameters,
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IManager $encryptionManager = null,
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Util $util = null,
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ILogger $logger = null,
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IFile $fileHelper = null,
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$uid = null,
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IStorage $keyStorage = null,
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Update $update = null,
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Manager $mountManager = null
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) {
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$this->mountPoint = $parameters['mountPoint'];
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$this->mount = $parameters['mount'];
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$this->encryptionManager = $encryptionManager;
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$this->util = $util;
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$this->logger = $logger;
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$this->uid = $uid;
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$this->fileHelper = $fileHelper;
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$this->keyStorage = $keyStorage;
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$this->unencryptedSize = array();
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$this->update = $update;
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$this->mountManager = $mountManager;
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parent::__construct($parameters);
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}
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/**
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* see http://php.net/manual/en/function.filesize.php
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* The result for filesize when called on a folder is required to be 0
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*
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* @param string $path
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* @return int
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*/
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public function filesize($path) {
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$fullPath = $this->getFullPath($path);
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$info = $this->getCache()->get($path);
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if (isset($this->unencryptedSize[$fullPath])) {
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$size = $this->unencryptedSize[$fullPath];
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if (isset($info['fileid'])) {
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$info['encrypted'] = true;
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$info['size'] = $size;
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$this->getCache()->put($path, $info);
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}
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return $size;
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}
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if (isset($info['fileid']) && $info['encrypted']) {
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return $info['size'];
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}
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return $this->storage->filesize($path);
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}
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/**
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* @param string $path
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* @return array
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*/
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public function getMetaData($path) {
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$data = $this->storage->getMetaData($path);
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if (is_null($data)) {
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return null;
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}
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$fullPath = $this->getFullPath($path);
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if (isset($this->unencryptedSize[$fullPath])) {
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$data['encrypted'] = true;
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$data['size'] = $this->unencryptedSize[$fullPath];
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} else {
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$info = $this->getCache()->get($path);
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if (isset($info['fileid']) && $info['encrypted']) {
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$data['encrypted'] = true;
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$data['size'] = $info['size'];
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}
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}
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return $data;
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}
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/**
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* see http://php.net/manual/en/function.file_get_contents.php
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*
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* @param string $path
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* @return string
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*/
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public function file_get_contents($path) {
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$encryptionModule = $this->getEncryptionModule($path);
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if ($encryptionModule) {
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$handle = $this->fopen($path, "r");
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if (!$handle) {
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return false;
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}
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$data = stream_get_contents($handle);
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fclose($handle);
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return $data;
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}
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return $this->storage->file_get_contents($path);
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}
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/**
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* see http://php.net/manual/en/function.file_put_contents.php
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*
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* @param string $path
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* @param string $data
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* @return bool
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*/
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public function file_put_contents($path, $data) {
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// file put content will always be translated to a stream write
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$handle = $this->fopen($path, 'w');
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$written = fwrite($handle, $data);
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fclose($handle);
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return $written;
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}
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/**
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* see http://php.net/manual/en/function.unlink.php
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*
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* @param string $path
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* @return bool
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*/
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public function unlink($path) {
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$fullPath = $this->getFullPath($path);
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if ($this->util->isExcluded($fullPath)) {
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return $this->storage->unlink($path);
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}
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$encryptionModule = $this->getEncryptionModule($path);
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if ($encryptionModule) {
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$this->keyStorage->deleteAllFileKeys($this->getFullPath($path));
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}
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return $this->storage->unlink($path);
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}
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/**
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* see http://php.net/manual/en/function.rename.php
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*
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* @param string $path1
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* @param string $path2
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* @return bool
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*/
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public function rename($path1, $path2) {
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$result = $this->storage->rename($path1, $path2);
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if ($result && $this->encryptionManager->isEnabled()) {
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$source = $this->getFullPath($path1);
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if (!$this->util->isExcluded($source)) {
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$target = $this->getFullPath($path2);
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if (isset($this->unencryptedSize[$source])) {
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$this->unencryptedSize[$target] = $this->unencryptedSize[$source];
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}
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$this->keyStorage->renameKeys($source, $target);
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}
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}
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return $result;
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}
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/**
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* see http://php.net/manual/en/function.rmdir.php
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*
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* @param string $path
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* @return bool
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*/
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public function rmdir($path) {
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$result = $this->storage->rmdir($path);
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$fullPath = $this->getFullPath($path);
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if ($result &&
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$this->util->isExcluded($fullPath) === false &&
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$this->encryptionManager->isEnabled()
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) {
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$this->keyStorage->deleteAllFileKeys($fullPath);
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}
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return $result;
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}
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/**
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* check if a file can be read
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*
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* @param string $path
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* @return bool
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*/
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public function isReadable($path) {
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$isReadable = true;
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$metaData = $this->getMetaData($path);
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if (
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!$this->is_dir($path) &&
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isset($metaData['encrypted']) &&
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$metaData['encrypted'] === true
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) {
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$fullPath = $this->getFullPath($path);
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$module = $this->getEncryptionModule($path);
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$isReadable = $module->isReadable($fullPath, $this->uid);
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}
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return $this->storage->isReadable($path) && $isReadable;
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}
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/**
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* see http://php.net/manual/en/function.copy.php
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*
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* @param string $path1
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* @param string $path2
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* @return bool
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*/
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public function copy($path1, $path2) {
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$source = $this->getFullPath($path1);
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$target = $this->getFullPath($path2);
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if ($this->util->isExcluded($source)) {
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return $this->storage->copy($path1, $path2);
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}
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$result = $this->storage->copy($path1, $path2);
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if ($result && $this->encryptionManager->isEnabled()) {
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$keysCopied = $this->copyKeys($source, $target);
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if ($keysCopied &&
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dirname($source) !== dirname($target) &&
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$this->util->isFile($target)
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) {
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$this->update->update($target);
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}
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$data = $this->getMetaData($path1);
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if (isset($data['encrypted'])) {
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$this->getCache()->put($path2, ['encrypted' => $data['encrypted']]);
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}
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if (isset($data['size'])) {
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$this->updateUnencryptedSize($target, $data['size']);
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}
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}
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return $result;
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}
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/**
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* see http://php.net/manual/en/function.fopen.php
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*
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* @param string $path
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* @param string $mode
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* @return resource
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* @throws GenericEncryptionException
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* @throws ModuleDoesNotExistsException
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*/
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public function fopen($path, $mode) {
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$encryptionEnabled = $this->encryptionManager->isEnabled();
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$shouldEncrypt = false;
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$encryptionModule = null;
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$header = $this->getHeader($path);
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$fullPath = $this->getFullPath($path);
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$encryptionModuleId = $this->util->getEncryptionModuleId($header);
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if ($this->util->isExcluded($fullPath) === false) {
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$size = $unencryptedSize = 0;
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$realFile = $this->util->stripPartialFileExtension($path);
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$targetExists = $this->file_exists($realFile) || $this->file_exists($path);
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$targetIsEncrypted = false;
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if ($targetExists) {
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// in case the file exists we require the explicit module as
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// specified in the file header - otherwise we need to fail hard to
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// prevent data loss on client side
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if (!empty($encryptionModuleId)) {
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$targetIsEncrypted = true;
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$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
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}
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if ($this->file_exists($path)) {
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$size = $this->storage->filesize($path);
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$unencryptedSize = $this->filesize($path);
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} else {
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$size = $unencryptedSize = 0;
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}
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}
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try {
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if (
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$mode === 'w'
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|| $mode === 'w+'
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|| $mode === 'wb'
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|| $mode === 'wb+'
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) {
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// don't overwrite encrypted files if encyption is not enabled
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if ($targetIsEncrypted && $encryptionEnabled === false) {
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throw new GenericEncryptionException('Tried to access encrypted file but encryption is not enabled');
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}
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if ($encryptionEnabled) {
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// if $encryptionModuleId is empty, the default module will be used
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$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
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$shouldEncrypt = $encryptionModule->shouldEncrypt($fullPath);
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}
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} else {
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$info = $this->getCache()->get($path);
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// only get encryption module if we found one in the header
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// or if file should be encrypted according to the file cache
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if (!empty($encryptionModuleId)) {
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$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
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$shouldEncrypt = true;
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} else if (empty($encryptionModuleId) && $info['encrypted'] === true) {
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// we come from a old installation. No header and/or no module defined
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// but the file is encrypted. In this case we need to use the
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// OC_DEFAULT_MODULE to read the file
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$encryptionModule = $this->encryptionManager->getEncryptionModule('OC_DEFAULT_MODULE');
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$shouldEncrypt = true;
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$targetIsEncrypted = true;
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}
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}
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} catch (ModuleDoesNotExistsException $e) {
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$this->logger->warning('Encryption module "' . $encryptionModuleId .
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'" not found, file will be stored unencrypted (' . $e->getMessage() . ')');
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}
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// encryption disabled on write of new file and write to existing unencrypted file -> don't encrypt
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if (!$encryptionEnabled || !$this->mount->getOption('encrypt', true)) {
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if (!$targetExists || !$targetIsEncrypted) {
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$shouldEncrypt = false;
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}
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}
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if ($shouldEncrypt === true && $encryptionModule !== null) {
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$source = $this->storage->fopen($path, $mode);
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$handle = \OC\Files\Stream\Encryption::wrap($source, $path, $fullPath, $header,
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$this->uid, $encryptionModule, $this->storage, $this, $this->util, $this->fileHelper, $mode,
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$size, $unencryptedSize, $this->getHeaderSize($path));
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return $handle;
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}
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}
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return $this->storage->fopen($path, $mode);
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}
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/**
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* @param Storage $sourceStorage
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* @param string $sourceInternalPath
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* @param string $targetInternalPath
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* @param bool $preserveMtime
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* @return bool
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*/
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public function moveFromStorage(Storage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = true) {
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// TODO clean this up once the underlying moveFromStorage in OC\Files\Storage\Wrapper\Common is fixed:
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// - call $this->storage->moveFromStorage() instead of $this->copyBetweenStorage
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// - copy the file cache update from $this->copyBetweenStorage to this method
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// - copy the copyKeys() call from $this->copyBetweenStorage to this method
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// - remove $this->copyBetweenStorage
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$result = $this->copyBetweenStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, true);
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if ($result) {
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if ($sourceStorage->is_dir($sourceInternalPath)) {
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$result &= $sourceStorage->rmdir($sourceInternalPath);
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} else {
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$result &= $sourceStorage->unlink($sourceInternalPath);
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}
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}
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return $result;
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}
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/**
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* @param Storage $sourceStorage
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* @param string $sourceInternalPath
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* @param string $targetInternalPath
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* @param bool $preserveMtime
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* @return bool
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*/
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public function copyFromStorage(Storage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = false) {
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// TODO clean this up once the underlying moveFromStorage in OC\Files\Storage\Wrapper\Common is fixed:
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// - call $this->storage->moveFromStorage() instead of $this->copyBetweenStorage
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// - copy the file cache update from $this->copyBetweenStorage to this method
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// - copy the copyKeys() call from $this->copyBetweenStorage to this method
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// - remove $this->copyBetweenStorage
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return $this->copyBetweenStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, false);
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}
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/**
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* copy file between two storages
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*
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* @param Storage $sourceStorage
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* @param string $sourceInternalPath
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* @param string $targetInternalPath
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* @param bool $preserveMtime
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* @param bool $isRename
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* @return bool
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*/
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private function copyBetweenStorage(Storage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime, $isRename) {
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// first copy the keys that we reuse the existing file key on the target location
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// and don't create a new one which would break versions for example.
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$mount = $this->mountManager->findByStorageId($sourceStorage->getId());
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if (count($mount) === 1) {
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$mountPoint = $mount[0]->getMountPoint();
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$source = $mountPoint . '/' . $sourceInternalPath;
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$target = $this->getFullPath($targetInternalPath);
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$this->copyKeys($source, $target);
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} else {
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$this->logger->error('Could not find mount point, can\'t keep encryption keys');
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}
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if ($sourceStorage->is_dir($sourceInternalPath)) {
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$dh = $sourceStorage->opendir($sourceInternalPath);
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$result = $this->mkdir($targetInternalPath);
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if (is_resource($dh)) {
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while ($result and ($file = readdir($dh)) !== false) {
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if (!Filesystem::isIgnoredDir($file)) {
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$result &= $this->copyFromStorage($sourceStorage, $sourceInternalPath . '/' . $file, $targetInternalPath . '/' . $file);
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}
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}
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}
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} else {
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$source = $sourceStorage->fopen($sourceInternalPath, 'r');
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$target = $this->fopen($targetInternalPath, 'w');
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list(, $result) = \OC_Helper::streamCopy($source, $target);
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fclose($source);
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fclose($target);
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if($result) {
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if ($preserveMtime) {
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$this->touch($targetInternalPath, $sourceStorage->filemtime($sourceInternalPath));
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}
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$isEncrypted = $this->encryptionManager->isEnabled() && $this->mount->getOption('encrypt', true) ? 1 : 0;
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// in case of a rename we need to manipulate the source cache because
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// this information will be kept for the new target
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if ($isRename) {
|
|
$sourceStorage->getCache()->put($sourceInternalPath, ['encrypted' => $isEncrypted]);
|
|
} else {
|
|
$this->getCache()->put($targetInternalPath, ['encrypted' => $isEncrypted]);
|
|
}
|
|
} else {
|
|
// delete partially written target file
|
|
$this->unlink($targetInternalPath);
|
|
// delete cache entry that was created by fopen
|
|
$this->getCache()->remove($targetInternalPath);
|
|
}
|
|
}
|
|
return (bool)$result;
|
|
|
|
}
|
|
|
|
/**
|
|
* get the path to a local version of the file.
|
|
* The local version of the file can be temporary and doesn't have to be persistent across requests
|
|
*
|
|
* @param string $path
|
|
* @return string
|
|
*/
|
|
public function getLocalFile($path) {
|
|
if ($this->encryptionManager->isEnabled()) {
|
|
$cachedFile = $this->getCachedFile($path);
|
|
if (is_string($cachedFile)) {
|
|
return $cachedFile;
|
|
}
|
|
}
|
|
return $this->storage->getLocalFile($path);
|
|
}
|
|
|
|
/**
|
|
* Returns the wrapped storage's value for isLocal()
|
|
*
|
|
* @return bool wrapped storage's isLocal() value
|
|
*/
|
|
public function isLocal() {
|
|
if ($this->encryptionManager->isEnabled()) {
|
|
return false;
|
|
}
|
|
return $this->storage->isLocal();
|
|
}
|
|
|
|
/**
|
|
* see http://php.net/manual/en/function.stat.php
|
|
* only the following keys are required in the result: size and mtime
|
|
*
|
|
* @param string $path
|
|
* @return array
|
|
*/
|
|
public function stat($path) {
|
|
$stat = $this->storage->stat($path);
|
|
$fileSize = $this->filesize($path);
|
|
$stat['size'] = $fileSize;
|
|
$stat[7] = $fileSize;
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* see http://php.net/manual/en/function.hash.php
|
|
*
|
|
* @param string $type
|
|
* @param string $path
|
|
* @param bool $raw
|
|
* @return string
|
|
*/
|
|
public function hash($type, $path, $raw = false) {
|
|
$fh = $this->fopen($path, 'rb');
|
|
$ctx = hash_init($type);
|
|
hash_update_stream($ctx, $fh);
|
|
fclose($fh);
|
|
return hash_final($ctx, $raw);
|
|
}
|
|
|
|
/**
|
|
* return full path, including mount point
|
|
*
|
|
* @param string $path relative to mount point
|
|
* @return string full path including mount point
|
|
*/
|
|
protected function getFullPath($path) {
|
|
return Filesystem::normalizePath($this->mountPoint . '/' . $path);
|
|
}
|
|
|
|
/**
|
|
* read first block of encrypted file, typically this will contain the
|
|
* encryption header
|
|
*
|
|
* @param string $path
|
|
* @return string
|
|
*/
|
|
protected function readFirstBlock($path) {
|
|
$firstBlock = '';
|
|
if ($this->storage->file_exists($path)) {
|
|
$handle = $this->storage->fopen($path, 'r');
|
|
$firstBlock = fread($handle, $this->util->getHeaderSize());
|
|
fclose($handle);
|
|
}
|
|
return $firstBlock;
|
|
}
|
|
|
|
/**
|
|
* return header size of given file
|
|
*
|
|
* @param string $path
|
|
* @return int
|
|
*/
|
|
protected function getHeaderSize($path) {
|
|
$headerSize = 0;
|
|
$realFile = $this->util->stripPartialFileExtension($path);
|
|
if ($this->storage->file_exists($realFile)) {
|
|
$path = $realFile;
|
|
}
|
|
$firstBlock = $this->readFirstBlock($path);
|
|
|
|
if (substr($firstBlock, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
|
|
$headerSize = strlen($firstBlock);
|
|
}
|
|
|
|
return $headerSize;
|
|
}
|
|
|
|
/**
|
|
* parse raw header to array
|
|
*
|
|
* @param string $rawHeader
|
|
* @return array
|
|
*/
|
|
protected function parseRawHeader($rawHeader) {
|
|
$result = array();
|
|
if (substr($rawHeader, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
|
|
$header = $rawHeader;
|
|
$endAt = strpos($header, Util::HEADER_END);
|
|
if ($endAt !== false) {
|
|
$header = substr($header, 0, $endAt + strlen(Util::HEADER_END));
|
|
|
|
// +1 to not start with an ':' which would result in empty element at the beginning
|
|
$exploded = explode(':', substr($header, strlen(Util::HEADER_START)+1));
|
|
|
|
$element = array_shift($exploded);
|
|
while ($element !== Util::HEADER_END) {
|
|
$result[$element] = array_shift($exploded);
|
|
$element = array_shift($exploded);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* read header from file
|
|
*
|
|
* @param string $path
|
|
* @return array
|
|
*/
|
|
protected function getHeader($path) {
|
|
$realFile = $this->util->stripPartialFileExtension($path);
|
|
if ($this->storage->file_exists($realFile)) {
|
|
$path = $realFile;
|
|
}
|
|
|
|
$firstBlock = $this->readFirstBlock($path);
|
|
$result = $this->parseRawHeader($firstBlock);
|
|
|
|
// if the header doesn't contain a encryption module we check if it is a
|
|
// legacy file. If true, we add the default encryption module
|
|
if (!isset($result[Util::HEADER_ENCRYPTION_MODULE_KEY])) {
|
|
if (!empty($result)) {
|
|
$result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
|
|
} else {
|
|
// if the header was empty we have to check first if it is a encrypted file at all
|
|
$info = $this->getCache()->get($path);
|
|
if (isset($info['encrypted']) && $info['encrypted'] === true) {
|
|
$result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
|
|
}
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* read encryption module needed to read/write the file located at $path
|
|
*
|
|
* @param string $path
|
|
* @return null|\OCP\Encryption\IEncryptionModule
|
|
* @throws ModuleDoesNotExistsException
|
|
* @throws \Exception
|
|
*/
|
|
protected function getEncryptionModule($path) {
|
|
$encryptionModule = null;
|
|
$header = $this->getHeader($path);
|
|
$encryptionModuleId = $this->util->getEncryptionModuleId($header);
|
|
if (!empty($encryptionModuleId)) {
|
|
try {
|
|
$encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
|
|
} catch (ModuleDoesNotExistsException $e) {
|
|
$this->logger->critical('Encryption module defined in "' . $path . '" not loaded!');
|
|
throw $e;
|
|
}
|
|
}
|
|
return $encryptionModule;
|
|
}
|
|
|
|
/**
|
|
* @param string $path
|
|
* @param int $unencryptedSize
|
|
*/
|
|
public function updateUnencryptedSize($path, $unencryptedSize) {
|
|
$this->unencryptedSize[$path] = $unencryptedSize;
|
|
}
|
|
|
|
/**
|
|
* copy keys to new location
|
|
*
|
|
* @param string $source path relative to data/
|
|
* @param string $target path relative to data/
|
|
* @return bool
|
|
*/
|
|
protected function copyKeys($source, $target) {
|
|
if (!$this->util->isExcluded($source)) {
|
|
return $this->keyStorage->copyKeys($source, $target);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
}
|