303 lines
7.9 KiB
PHP
303 lines
7.9 KiB
PHP
<?php
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/**
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* @author Björn Schießle <schiessle@owncloud.com>
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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\Encryption\Keys;
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use OC\Encryption\Util;
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use OC\Files\Filesystem;
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use OC\Files\View;
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use OCP\Encryption\Exceptions\GenericEncryptionException;
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use OCP\Encryption\Keys\IStorage;
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class Storage implements IStorage {
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/** @var View */
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private $view;
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/** @var Util */
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private $util;
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// base dir where all the file related keys are stored
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private $keys_base_dir;
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private $encryption_base_dir;
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private $keyCache = array();
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/**
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* @param string $encryptionModuleId
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* @param View $view
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* @param Util $util
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*/
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public function __construct(View $view, Util $util) {
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$this->view = $view;
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$this->util = $util;
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$this->encryption_base_dir = '/files_encryption';
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$this->keys_base_dir = $this->encryption_base_dir .'/keys';
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}
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/**
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* @inheritdoc
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*/
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public function getUserKey($uid, $keyId, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, $uid);
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return $this->getKey($path);
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}
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/**
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* @inheritdoc
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*/
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public function getFileKey($path, $keyId, $encryptionModuleId) {
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$keyDir = $this->getFileKeyDir($encryptionModuleId, $path);
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return $this->getKey($keyDir . $keyId);
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}
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/**
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* @inheritdoc
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*/
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public function getSystemUserKey($keyId, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, null);
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return $this->getKey($path);
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}
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/**
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* @inheritdoc
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*/
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public function setUserKey($uid, $keyId, $key, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, $uid);
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return $this->setKey($path, $key);
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}
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/**
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* @inheritdoc
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*/
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public function setFileKey($path, $keyId, $key, $encryptionModuleId) {
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$keyDir = $this->getFileKeyDir($encryptionModuleId, $path);
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return $this->setKey($keyDir . $keyId, $key);
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}
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/**
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* @inheritdoc
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*/
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public function setSystemUserKey($keyId, $key, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, null);
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return $this->setKey($path, $key);
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}
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/**
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* @inheritdoc
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*/
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public function deleteUserKey($uid, $keyId, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, $uid);
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return !$this->view->file_exists($path) || $this->view->unlink($path);
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}
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/**
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* @inheritdoc
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*/
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public function deleteFileKey($path, $keyId, $encryptionModuleId) {
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$keyDir = $this->getFileKeyDir($encryptionModuleId, $path);
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return !$this->view->file_exists($keyDir . $keyId) || $this->view->unlink($keyDir . $keyId);
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}
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/**
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* @inheritdoc
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*/
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public function deleteAllFileKeys($path, $encryptionModuleId) {
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$keyDir = $this->getFileKeyDir($encryptionModuleId, $path);
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$path = dirname($keyDir);
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return !$this->view->file_exists($path) || $this->view->deleteAll($path);
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}
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/**
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* @inheritdoc
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*/
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public function deleteSystemUserKey($keyId, $encryptionModuleId) {
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$path = $this->constructUserKeyPath($encryptionModuleId, $keyId, null);
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return !$this->view->file_exists($path) || $this->view->unlink($path);
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}
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/**
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* construct path to users key
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*
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* @param string $keyId
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* @param string $uid
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* @return string
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*/
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protected function constructUserKeyPath($encryptionModuleId, $keyId, $uid) {
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if ($uid === null) {
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$path = $this->encryption_base_dir . '/' . $encryptionModuleId . '/' . $keyId;
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} else {
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$path = '/' . $uid . $this->encryption_base_dir . '/'
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. $encryptionModuleId . '/' . $uid . '.' . $keyId;
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}
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return $path;
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}
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/**
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* read key from hard disk
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*
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* @param string $path to key
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* @return string
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*/
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private function getKey($path) {
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$key = '';
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if ($this->view->file_exists($path)) {
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if (isset($this->keyCache[$path])) {
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$key = $this->keyCache[$path];
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} else {
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$key = $this->view->file_get_contents($path);
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$this->keyCache[$path] = $key;
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}
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}
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return $key;
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}
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/**
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* write key to disk
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*
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*
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* @param string $path path to key directory
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* @param string $key key
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* @return bool
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*/
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private function setKey($path, $key) {
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$this->keySetPreparation(dirname($path));
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$result = $this->view->file_put_contents($path, $key);
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if (is_int($result) && $result > 0) {
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$this->keyCache[$path] = $key;
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return true;
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}
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return false;
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}
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/**
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* get path to key folder for a given file
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*
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* @param string $path path to the file, relative to data/
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* @return string
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* @throws GenericEncryptionException
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* @internal param string $keyId
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*/
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private function getFileKeyDir($encryptionModuleId, $path) {
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if ($this->view->is_dir($path)) {
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throw new GenericEncryptionException("file was expected but directory was given: $path");
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}
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list($owner, $filename) = $this->util->getUidAndFilename($path);
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$filename = $this->util->stripPartialFileExtension($filename);
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// in case of system wide mount points the keys are stored directly in the data directory
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if ($this->util->isSystemWideMountPoint($filename, $owner)) {
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$keyPath = $this->keys_base_dir . $filename . '/';
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} else {
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$keyPath = '/' . $owner . $this->keys_base_dir . $filename . '/';
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}
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return Filesystem::normalizePath($keyPath . $encryptionModuleId . '/', false);
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}
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/**
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* move keys if a file was renamed
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*
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* @param string $source
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* @param string $target
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* @param string $owner
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* @param bool $systemWide
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*/
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public function renameKeys($source, $target) {
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list($owner, $source) = $this->util->getUidAndFilename($source);
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list(, $target) = $this->util->getUidAndFilename($target);
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$systemWide = $this->util->isSystemWideMountPoint($target, $owner);
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if ($systemWide) {
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$sourcePath = $this->keys_base_dir . $source . '/';
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$targetPath = $this->keys_base_dir . $target . '/';
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} else {
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$sourcePath = '/' . $owner . $this->keys_base_dir . $source . '/';
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$targetPath = '/' . $owner . $this->keys_base_dir . $target . '/';
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}
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if ($this->view->file_exists($sourcePath)) {
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$this->keySetPreparation(dirname($targetPath));
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$this->view->rename($sourcePath, $targetPath);
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}
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}
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/**
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* copy keys if a file was renamed
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*
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* @param string $source
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* @param string $target
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* @param string $owner
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* @param bool $systemWide
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*/
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public function copyKeys($source, $target) {
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list($owner, $source) = $this->util->getUidAndFilename($source);
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list(, $target) = $this->util->getUidAndFilename($target);
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$systemWide = $this->util->isSystemWideMountPoint($target, $owner);
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if ($systemWide) {
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$sourcePath = $this->keys_base_dir . $source . '/';
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$targetPath = $this->keys_base_dir . $target . '/';
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} else {
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$sourcePath = '/' . $owner . $this->keys_base_dir . $source . '/';
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$targetPath = '/' . $owner . $this->keys_base_dir . $target . '/';
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}
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if ($this->view->file_exists($sourcePath)) {
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$this->keySetPreparation(dirname($targetPath));
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$this->view->copy($sourcePath, $targetPath);
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}
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}
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/**
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* Make preparations to filesystem for saving a keyfile
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*
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* @param string $path relative to the views root
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*/
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protected function keySetPreparation($path) {
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// If the file resides within a subdirectory, create it
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if (!$this->view->file_exists($path)) {
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$sub_dirs = explode('/', ltrim($path, '/'));
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$dir = '';
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foreach ($sub_dirs as $sub_dir) {
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$dir .= '/' . $sub_dir;
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if (!$this->view->is_dir($dir)) {
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$this->view->mkdir($dir);
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}
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}
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}
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}
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}
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