68748d4f85
* Order the imports * No leading slash on imports * Empty line before namespace * One line per import * Empty after imports * Emmpty line at bottom of file Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
316 lines
7.9 KiB
PHP
316 lines
7.9 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 Björn Schießle <bjoern@schiessle.org>
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* @author Clark Tomlinson <fallen013@gmail.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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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\Encryption;
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use OC\Files\View;
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use OCA\Encryption\Crypto\Crypt;
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use OCP\Encryption\IFile;
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use OCP\Encryption\Keys\IStorage;
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use OCP\IConfig;
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use OCP\IUser;
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use OCP\IUserSession;
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use OCP\PreConditionNotMetException;
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use OCP\Security\ISecureRandom;
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class Recovery {
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/**
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* @var null|IUser
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*/
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protected $user;
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/**
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* @var Crypt
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*/
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protected $crypt;
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/**
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* @var KeyManager
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*/
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private $keyManager;
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/**
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* @var IConfig
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*/
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private $config;
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/**
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* @var View
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*/
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private $view;
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/**
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* @var IFile
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*/
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private $file;
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/**
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* @param IUserSession $userSession
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* @param Crypt $crypt
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* @param KeyManager $keyManager
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* @param IConfig $config
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* @param IFile $file
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* @param View $view
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*/
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public function __construct(IUserSession $userSession,
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Crypt $crypt,
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KeyManager $keyManager,
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IConfig $config,
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IFile $file,
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View $view) {
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$this->user = ($userSession && $userSession->isLoggedIn()) ? $userSession->getUser() : false;
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$this->crypt = $crypt;
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$this->keyManager = $keyManager;
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$this->config = $config;
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$this->view = $view;
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$this->file = $file;
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}
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/**
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* @param string $password
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* @return bool
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*/
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public function enableAdminRecovery($password) {
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$appConfig = $this->config;
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$keyManager = $this->keyManager;
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if (!$keyManager->recoveryKeyExists()) {
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$keyPair = $this->crypt->createKeyPair();
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if(!is_array($keyPair)) {
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return false;
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}
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$this->keyManager->setRecoveryKey($password, $keyPair);
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}
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if ($keyManager->checkRecoveryPassword($password)) {
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$appConfig->setAppValue('encryption', 'recoveryAdminEnabled', 1);
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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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* change recovery key id
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*
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* @param string $newPassword
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* @param string $oldPassword
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* @return bool
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*/
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public function changeRecoveryKeyPassword($newPassword, $oldPassword) {
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$recoveryKey = $this->keyManager->getSystemPrivateKey($this->keyManager->getRecoveryKeyId());
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$decryptedRecoveryKey = $this->crypt->decryptPrivateKey($recoveryKey, $oldPassword);
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if($decryptedRecoveryKey === false) {
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return false;
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}
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$encryptedRecoveryKey = $this->crypt->encryptPrivateKey($decryptedRecoveryKey, $newPassword);
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$header = $this->crypt->generateHeader();
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if ($encryptedRecoveryKey) {
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$this->keyManager->setSystemPrivateKey($this->keyManager->getRecoveryKeyId(), $header . $encryptedRecoveryKey);
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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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* @param string $recoveryPassword
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* @return bool
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*/
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public function disableAdminRecovery($recoveryPassword) {
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$keyManager = $this->keyManager;
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if ($keyManager->checkRecoveryPassword($recoveryPassword)) {
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// Set recoveryAdmin as disabled
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$this->config->setAppValue('encryption', 'recoveryAdminEnabled', 0);
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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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* check if recovery is enabled for user
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*
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* @param string $user if no user is given we check the current logged-in user
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*
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* @return bool
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*/
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public function isRecoveryEnabledForUser($user = '') {
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$uid = $user === '' ? $this->user->getUID() : $user;
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$recoveryMode = $this->config->getUserValue($uid,
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'encryption',
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'recoveryEnabled',
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0);
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return ($recoveryMode === '1');
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}
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/**
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* check if recovery is key is enabled by the administrator
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*
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* @return bool
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*/
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public function isRecoveryKeyEnabled() {
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$enabled = $this->config->getAppValue('encryption', 'recoveryAdminEnabled', 0);
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return ($enabled === '1');
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}
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/**
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* @param string $value
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* @return bool
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*/
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public function setRecoveryForUser($value) {
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try {
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$this->config->setUserValue($this->user->getUID(),
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'encryption',
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'recoveryEnabled',
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$value);
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if ($value === '1') {
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$this->addRecoveryKeys('/' . $this->user->getUID() . '/files/');
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} else {
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$this->removeRecoveryKeys('/' . $this->user->getUID() . '/files/');
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}
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return true;
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} catch (PreConditionNotMetException $e) {
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return false;
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}
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}
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/**
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* add recovery key to all encrypted files
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* @param string $path
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*/
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private function addRecoveryKeys($path) {
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$dirContent = $this->view->getDirectoryContent($path);
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foreach ($dirContent as $item) {
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$filePath = $item->getPath();
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if ($item['type'] === 'dir') {
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$this->addRecoveryKeys($filePath . '/');
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} else {
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$fileKey = $this->keyManager->getFileKey($filePath, $this->user->getUID());
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if (!empty($fileKey)) {
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$accessList = $this->file->getAccessList($filePath);
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$publicKeys = array();
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foreach ($accessList['users'] as $uid) {
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$publicKeys[$uid] = $this->keyManager->getPublicKey($uid);
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}
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$publicKeys = $this->keyManager->addSystemKeys($accessList, $publicKeys, $this->user->getUID());
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$encryptedKeyfiles = $this->crypt->multiKeyEncrypt($fileKey, $publicKeys);
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$this->keyManager->setAllFileKeys($filePath, $encryptedKeyfiles);
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}
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}
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}
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}
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/**
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* remove recovery key to all encrypted files
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* @param string $path
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*/
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private function removeRecoveryKeys($path) {
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$dirContent = $this->view->getDirectoryContent($path);
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foreach ($dirContent as $item) {
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$filePath = $item->getPath();
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if ($item['type'] === 'dir') {
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$this->removeRecoveryKeys($filePath . '/');
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} else {
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$this->keyManager->deleteShareKey($filePath, $this->keyManager->getRecoveryKeyId());
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}
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}
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}
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/**
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* recover users files with the recovery key
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*
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* @param string $recoveryPassword
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* @param string $user
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*/
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public function recoverUsersFiles($recoveryPassword, $user) {
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$encryptedKey = $this->keyManager->getSystemPrivateKey($this->keyManager->getRecoveryKeyId());
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$privateKey = $this->crypt->decryptPrivateKey($encryptedKey, $recoveryPassword);
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if($privateKey !== false) {
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$this->recoverAllFiles('/' . $user . '/files/', $privateKey, $user);
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}
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}
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/**
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* recover users files
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*
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* @param string $path
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* @param string $privateKey
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* @param string $uid
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*/
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private function recoverAllFiles($path, $privateKey, $uid) {
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$dirContent = $this->view->getDirectoryContent($path);
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foreach ($dirContent as $item) {
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// Get relative path from encryption/keyfiles
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$filePath = $item->getPath();
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if ($this->view->is_dir($filePath)) {
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$this->recoverAllFiles($filePath . '/', $privateKey, $uid);
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} else {
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$this->recoverFile($filePath, $privateKey, $uid);
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}
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}
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}
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/**
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* recover file
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*
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* @param string $path
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* @param string $privateKey
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* @param string $uid
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*/
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private function recoverFile($path, $privateKey, $uid) {
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$encryptedFileKey = $this->keyManager->getEncryptedFileKey($path);
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$shareKey = $this->keyManager->getShareKey($path, $this->keyManager->getRecoveryKeyId());
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if ($encryptedFileKey && $shareKey && $privateKey) {
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$fileKey = $this->crypt->multiKeyDecrypt($encryptedFileKey,
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$shareKey,
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$privateKey);
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}
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if (!empty($fileKey)) {
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$accessList = $this->file->getAccessList($path);
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$publicKeys = array();
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foreach ($accessList['users'] as $user) {
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$publicKeys[$user] = $this->keyManager->getPublicKey($user);
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}
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$publicKeys = $this->keyManager->addSystemKeys($accessList, $publicKeys, $uid);
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$encryptedKeyfiles = $this->crypt->multiKeyEncrypt($fileKey, $publicKeys);
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$this->keyManager->setAllFileKeys($path, $encryptedKeyfiles);
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}
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}
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}
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