1693 lines
45 KiB
PHP
1693 lines
45 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Sam Tuke, Frank Karlitschek, Bjoern Schiessle
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* @copyright 2012 Sam Tuke <samtuke@owncloud.com>,
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* Frank Karlitschek <frank@owncloud.org>,
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* Bjoern Schiessle <schiessle@owncloud.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library 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
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* License along with this library. 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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/**
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* @brief Class for utilities relating to encrypted file storage system
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* @param \OC\Files\View $view expected to have OC '/' as root path
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* @param string $userId ID of the logged in user
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* @param int $client indicating status of client side encryption. Currently
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* unused, likely to become obsolete shortly
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*/
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class Util {
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const MIGRATION_COMPLETED = 1; // migration to new encryption completed
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const MIGRATION_IN_PROGRESS = -1; // migration is running
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const MIGRATION_OPEN = 0; // user still needs to be migrated
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private $view; // OC\Files\View object for filesystem operations
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private $userId; // ID of the user we use to encrypt/decrypt files
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private $keyId; // ID of the key we want to manipulate
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private $client; // Client side encryption mode flag
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private $publicKeyDir; // Dir containing all public user keys
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private $encryptionDir; // Dir containing user's files_encryption
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private $keyfilesPath; // Dir containing user's keyfiles
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private $shareKeysPath; // Dir containing env keys for shared files
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private $publicKeyPath; // Path to user's public key
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private $privateKeyPath; // Path to user's private key
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private $publicShareKeyId;
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private $recoveryKeyId;
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private $isPublic;
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/**
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* @param \OC\Files\View $view
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* @param $userId
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* @param bool $client
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*/
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public function __construct($view, $userId, $client = false) {
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$this->view = $view;
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$this->client = $client;
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$this->userId = $userId;
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$appConfig = \OC::$server->getAppConfig();
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$this->publicShareKeyId = $appConfig->getValue('files_encryption', 'publicShareKeyId');
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$this->recoveryKeyId = $appConfig->getValue('files_encryption', 'recoveryKeyId');
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$this->userDir = '/' . $this->userId;
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$this->fileFolderName = 'files';
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$this->userFilesDir =
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'/' . $userId . '/' . $this->fileFolderName; // TODO: Does this need to be user configurable?
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$this->publicKeyDir = '/' . 'public-keys';
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$this->encryptionDir = '/' . $this->userId . '/' . 'files_encryption';
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$this->keyfilesPath = $this->encryptionDir . '/' . 'keyfiles';
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$this->shareKeysPath = $this->encryptionDir . '/' . 'share-keys';
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$this->publicKeyPath =
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$this->publicKeyDir . '/' . $this->userId . '.public.key'; // e.g. data/public-keys/admin.public.key
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$this->privateKeyPath =
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$this->encryptionDir . '/' . $this->userId . '.private.key'; // e.g. data/admin/admin.private.key
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// make sure that the owners home is mounted
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\OC\Files\Filesystem::initMountPoints($userId);
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if (\OCA\Encryption\Helper::isPublicAccess()) {
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$this->keyId = $this->publicShareKeyId;
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$this->isPublic = true;
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} else {
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$this->keyId = $this->userId;
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$this->isPublic = false;
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}
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}
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/**
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* @return bool
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*/
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public function ready() {
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if (
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!$this->view->file_exists($this->encryptionDir)
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or !$this->view->file_exists($this->keyfilesPath)
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or !$this->view->file_exists($this->shareKeysPath)
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or !$this->view->file_exists($this->publicKeyPath)
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or !$this->view->file_exists($this->privateKeyPath)
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) {
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return false;
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} else {
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return true;
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}
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}
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/**
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* @brief check if the users private & public key exists
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* @return boolean
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*/
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public function userKeysExists() {
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if (
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$this->view->file_exists($this->privateKeyPath) &&
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$this->view->file_exists($this->publicKeyPath)) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* @brief Sets up user folders and keys for serverside encryption
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*
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* @param string $passphrase to encrypt server-stored private key with
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* @return bool
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*/
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public function setupServerSide($passphrase = null) {
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// Set directories to check / create
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$setUpDirs = array(
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$this->userDir,
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$this->publicKeyDir,
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$this->encryptionDir,
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$this->keyfilesPath,
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$this->shareKeysPath
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);
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// Check / create all necessary dirs
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foreach ($setUpDirs as $dirPath) {
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if (!$this->view->file_exists($dirPath)) {
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$this->view->mkdir($dirPath);
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}
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}
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// Create user keypair
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// we should never override a keyfile
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if (
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!$this->view->file_exists($this->publicKeyPath)
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&& !$this->view->file_exists($this->privateKeyPath)
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) {
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// Generate keypair
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$keypair = Crypt::createKeypair();
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if ($keypair) {
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\OC_FileProxy::$enabled = false;
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// Encrypt private key with user pwd as passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], $passphrase);
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// Save key-pair
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if ($encryptedPrivateKey) {
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$this->view->file_put_contents($this->privateKeyPath, $encryptedPrivateKey);
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$this->view->file_put_contents($this->publicKeyPath, $keypair['publicKey']);
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}
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\OC_FileProxy::$enabled = true;
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}
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} else {
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// check if public-key exists but private-key is missing
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if ($this->view->file_exists($this->publicKeyPath) && !$this->view->file_exists($this->privateKeyPath)) {
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\OCP\Util::writeLog('Encryption library',
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'public key exists but private key is missing for "' . $this->keyId . '"', \OCP\Util::FATAL);
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return false;
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} else {
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if (!$this->view->file_exists($this->publicKeyPath) && $this->view->file_exists($this->privateKeyPath)
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) {
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\OCP\Util::writeLog('Encryption library',
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'private key exists but public key is missing for "' . $this->keyId . '"', \OCP\Util::FATAL);
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return false;
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}
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}
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}
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// If there's no record for this user's encryption preferences
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if (false === $this->recoveryEnabledForUser()) {
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// create database configuration
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$sql = 'INSERT INTO `*PREFIX*encryption` (`uid`,`mode`,`recovery_enabled`,`migration_status`) VALUES (?,?,?,?)';
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$args = array(
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$this->userId,
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'server-side',
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0,
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self::MIGRATION_OPEN
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);
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$query = \OCP\DB::prepare($sql);
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$query->execute($args);
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}
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return true;
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}
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/**
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* @return string
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*/
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public function getPublicShareKeyId() {
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return $this->publicShareKeyId;
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}
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/**
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* @brief Check whether pwd recovery is enabled for a given user
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* @return bool 1 = yes, 0 = no, false = no record
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*
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* @note If records are not being returned, check for a hidden space
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* at the start of the uid in db
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*/
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public function recoveryEnabledForUser() {
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$sql = 'SELECT `recovery_enabled` FROM `*PREFIX*encryption` WHERE `uid` = ?';
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$args = array($this->userId);
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$query = \OCP\DB::prepare($sql);
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$result = $query->execute($args);
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$recoveryEnabled = array();
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if (\OCP\DB::isError($result)) {
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\OCP\Util::writeLog('Encryption library', \OC_DB::getErrorMessage($result), \OCP\Util::ERROR);
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} else {
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$row = $result->fetchRow();
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if ($row && isset($row['recovery_enabled'])) {
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$recoveryEnabled[] = $row['recovery_enabled'];
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}
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}
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// If no record is found
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if (empty($recoveryEnabled)) {
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return false;
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// If a record is found
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} else {
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return $recoveryEnabled[0];
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}
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}
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/**
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* @brief Enable / disable pwd recovery for a given user
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* @param bool $enabled Whether to enable or disable recovery
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* @return bool
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*/
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public function setRecoveryForUser($enabled) {
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$recoveryStatus = $this->recoveryEnabledForUser();
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// If a record for this user already exists, update it
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if (false === $recoveryStatus) {
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$sql = 'INSERT INTO `*PREFIX*encryption` (`uid`,`mode`,`recovery_enabled`) VALUES (?,?,?)';
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$args = array(
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$this->userId,
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'server-side',
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$enabled
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);
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// Create a new record instead
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} else {
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$sql = 'UPDATE `*PREFIX*encryption` SET `recovery_enabled` = ? WHERE `uid` = ?';
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$args = array(
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$enabled ? '1' : '0',
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$this->userId
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);
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}
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return is_numeric(\OC_DB::executeAudited($sql, $args));
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}
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/**
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* @brief Find all files and their encryption status within a directory
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* @param string $directory The path of the parent directory to search
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* @param bool $found the founded files if called again
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* @return mixed false if 0 found, array on success. Keys: name, path
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* @note $directory needs to be a path relative to OC data dir. e.g.
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* /admin/files NOT /backup OR /home/www/oc/data/admin/files
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*/
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public function findEncFiles($directory, &$found = false) {
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// Disable proxy - we don't want files to be decrypted before
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// we handle them
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\OC_FileProxy::$enabled = false;
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if ($found === false) {
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$found = array(
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'plain' => array(),
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'encrypted' => array(),
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'legacy' => array(),
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'broken' => array(),
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);
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}
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if (
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$this->view->is_dir($directory)
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&& $handle = $this->view->opendir($directory)
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) {
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if(is_resource($handle)) {
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while (false !== ($file = readdir($handle))) {
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if ($file !== "." && $file !== "..") {
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$filePath = $directory . '/' . $this->view->getRelativePath('/' . $file);
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$relPath = \OCA\Encryption\Helper::stripUserFilesPath($filePath);
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// If the path is a directory, search
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// its contents
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if ($this->view->is_dir($filePath)) {
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$this->findEncFiles($filePath, $found);
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// If the path is a file, determine
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// its encryption status
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} elseif ($this->view->is_file($filePath)) {
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// Disable proxies again, some-
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// where they got re-enabled :/
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\OC_FileProxy::$enabled = false;
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$isEncryptedPath = $this->isEncryptedPath($filePath);
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// If the file is encrypted
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// NOTE: If the userId is
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// empty or not set, file will
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// detected as plain
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// NOTE: This is inefficient;
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// scanning every file like this
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// will eat server resources :(
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if ($isEncryptedPath) {
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$fileKey = Keymanager::getFileKey($this->view, $this, $relPath);
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$shareKey = Keymanager::getShareKey($this->view, $this->userId, $this, $relPath);
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// if file is encrypted but now file key is available, throw exception
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if ($fileKey === false || $shareKey === false) {
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\OCP\Util::writeLog('encryption library', 'No keys available to decrypt the file: ' . $filePath, \OCP\Util::ERROR);
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$found['broken'][] = array(
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'name' => $file,
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'path' => $filePath,
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);
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} else {
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$found['encrypted'][] = array(
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'name' => $file,
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'path' => $filePath,
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);
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}
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// If the file uses old
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// encryption system
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} elseif (Crypt::isLegacyEncryptedContent($isEncryptedPath, $relPath)) {
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$found['legacy'][] = array(
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'name' => $file,
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'path' => $filePath
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);
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// If the file is not encrypted
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} else {
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$found['plain'][] = array(
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'name' => $file,
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'path' => $relPath
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);
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}
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}
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}
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}
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}
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\OC_FileProxy::$enabled = true;
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if (empty($found)) {
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return false;
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} else {
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return $found;
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}
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}
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\OC_FileProxy::$enabled = true;
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return false;
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}
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/**
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* @brief Check if a given path identifies an encrypted file
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* @param string $path
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* @return boolean
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*/
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public function isEncryptedPath($path) {
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// Disable encryption proxy so data retrieved is in its
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// original form
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$data = '';
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// we only need 24 byte from the last chunk
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if ($this->view->file_exists($path)) {
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$handle = $this->view->fopen($path, 'r');
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if (is_resource($handle)) {
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// suppress fseek warining, we handle the case that fseek doesn't
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// work in the else branch
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if (@fseek($handle, -24, SEEK_END) === 0) {
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$data = fgets($handle);
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} else {
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// if fseek failed on the storage we create a local copy from the file
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// and read this one
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fclose($handle);
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$localFile = $this->view->getLocalFile($path);
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$handle = fopen($localFile, 'r');
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if (is_resource($handle) && fseek($handle, -24, SEEK_END) === 0) {
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$data = fgets($handle);
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}
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}
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fclose($handle);
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}
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}
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// re-enable proxy
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\OC_FileProxy::$enabled = $proxyStatus;
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return Crypt::isCatfileContent($data);
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}
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/**
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* @brief get the file size of the unencrypted file
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* @param string $path absolute path
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* @return bool
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*/
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public function getFileSize($path) {
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$result = 0;
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// Disable encryption proxy to prevent recursive calls
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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// split the path parts
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$pathParts = explode('/', $path);
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if (isset($pathParts[2]) && $pathParts[2] === 'files' && $this->view->file_exists($path)
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&& $this->isEncryptedPath($path)
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) {
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// get the size from filesystem
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$size = $this->view->filesize($path);
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// fast path, else the calculation for $lastChunkNr is bogus
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if ($size === 0) {
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\OC_FileProxy::$enabled = $proxyStatus;
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return 0;
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}
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// calculate last chunk nr
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// next highest is end of chunks, one subtracted is last one
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// we have to read the last chunk, we can't just calculate it (because of padding etc)
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$lastChunkNr = ceil($size/ 8192) - 1;
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$lastChunkSize = $size - ($lastChunkNr * 8192);
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// open stream
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$stream = fopen('crypt://' . $path, "r");
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if (is_resource($stream)) {
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// calculate last chunk position
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$lastChunckPos = ($lastChunkNr * 8192);
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// seek to end
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if (@fseek($stream, $lastChunckPos) === -1) {
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// storage doesn't support fseek, we need a local copy
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fclose($stream);
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$localFile = $this->view->getLocalFile($path);
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Helper::addTmpFileToMapper($localFile, $path);
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$stream = fopen('crypt://' . $localFile, "r");
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if (fseek($stream, $lastChunckPos) === -1) {
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// if fseek also fails on the local storage, than
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// there is nothing we can do
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fclose($stream);
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\OCP\Util::writeLog('Encryption library', 'couldn\'t determine size of "' . $path, \OCP\Util::ERROR);
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return $result;
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}
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}
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// get the content of the last chunk
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$lastChunkContent = fread($stream, $lastChunkSize);
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// calc the real file size with the size of the last chunk
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$realSize = (($lastChunkNr * 6126) + strlen($lastChunkContent));
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// store file size
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$result = $realSize;
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}
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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|
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/**
|
|
* @brief fix the file size of the encrypted file
|
|
* @param string $path absolute path
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* @return boolean true / false if file is encrypted
|
|
*/
|
|
public function fixFileSize($path) {
|
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$result = false;
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|
|
// Disable encryption proxy to prevent recursive calls
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
\OC_FileProxy::$enabled = false;
|
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|
|
$realSize = $this->getFileSize($path);
|
|
|
|
if ($realSize > 0) {
|
|
|
|
$cached = $this->view->getFileInfo($path);
|
|
$cached['encrypted'] = true;
|
|
|
|
// set the size
|
|
$cached['unencrypted_size'] = $realSize;
|
|
|
|
// put file info
|
|
$this->view->putFileInfo($path, $cached);
|
|
|
|
$result = true;
|
|
|
|
}
|
|
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
|
|
return $result;
|
|
}
|
|
|
|
|
|
/**
|
|
* @param string $path
|
|
* @return bool
|
|
*/
|
|
public function isSharedPath($path) {
|
|
|
|
$trimmed = ltrim($path, '/');
|
|
$split = explode('/', $trimmed);
|
|
|
|
if (isset($split[2]) && $split[2] === 'Shared') {
|
|
|
|
return true;
|
|
|
|
} else {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief encrypt versions from given file
|
|
* @param array $filelist list of encrypted files, relative to data/user/files
|
|
* @return boolean
|
|
*/
|
|
private function encryptVersions($filelist) {
|
|
|
|
$successful = true;
|
|
|
|
if (\OCP\App::isEnabled('files_versions')) {
|
|
|
|
foreach ($filelist as $filename) {
|
|
|
|
$versions = \OCA\Files_Versions\Storage::getVersions($this->userId, $filename);
|
|
foreach ($versions as $version) {
|
|
|
|
$path = '/' . $this->userId . '/files_versions/' . $version['path'] . '.v' . $version['version'];
|
|
|
|
$encHandle = fopen('crypt://' . $path . '.part', 'wb');
|
|
|
|
if ($encHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $path . '", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
$plainHandle = $this->view->fopen($path, 'rb');
|
|
if ($plainHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $path . '.part", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
stream_copy_to_stream($plainHandle, $encHandle);
|
|
|
|
fclose($encHandle);
|
|
fclose($plainHandle);
|
|
|
|
$this->view->rename($path . '.part', $path);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $successful;
|
|
}
|
|
|
|
/**
|
|
* @brief decrypt versions from given file
|
|
* @param string $filelist list of decrypted files, relative to data/user/files
|
|
* @return boolean
|
|
*/
|
|
private function decryptVersions($filelist) {
|
|
|
|
$successful = true;
|
|
|
|
if (\OCP\App::isEnabled('files_versions')) {
|
|
|
|
foreach ($filelist as $filename) {
|
|
|
|
$versions = \OCA\Files_Versions\Storage::getVersions($this->userId, $filename);
|
|
foreach ($versions as $version) {
|
|
|
|
$path = '/' . $this->userId . '/files_versions/' . $version['path'] . '.v' . $version['version'];
|
|
|
|
$encHandle = fopen('crypt://' . $path, 'rb');
|
|
|
|
if ($encHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $path . '", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
$plainHandle = $this->view->fopen($path . '.part', 'wb');
|
|
if ($plainHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $path . '.part", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
stream_copy_to_stream($encHandle, $plainHandle);
|
|
|
|
fclose($encHandle);
|
|
fclose($plainHandle);
|
|
|
|
$this->view->rename($path . '.part', $path);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $successful;
|
|
}
|
|
|
|
/**
|
|
* @brief Decrypt all files
|
|
* @return bool
|
|
*/
|
|
public function decryptAll() {
|
|
|
|
$found = $this->findEncFiles($this->userId . '/files');
|
|
|
|
$successful = true;
|
|
|
|
if ($found) {
|
|
|
|
$versionStatus = \OCP\App::isEnabled('files_versions');
|
|
\OC_App::disable('files_versions');
|
|
|
|
$decryptedFiles = array();
|
|
|
|
// Encrypt unencrypted files
|
|
foreach ($found['encrypted'] as $encryptedFile) {
|
|
|
|
//relative to data/<user>/file
|
|
$relPath = Helper::stripUserFilesPath($encryptedFile['path']);
|
|
|
|
//get file info
|
|
$fileInfo = \OC\Files\Filesystem::getFileInfo($relPath);
|
|
|
|
//relative to /data
|
|
$rawPath = $encryptedFile['path'];
|
|
|
|
//get timestamp
|
|
$timestamp = $fileInfo['mtime'];
|
|
|
|
//enable proxy to use OC\Files\View to access the original file
|
|
\OC_FileProxy::$enabled = true;
|
|
|
|
// Open enc file handle for binary reading
|
|
$encHandle = $this->view->fopen($rawPath, 'rb');
|
|
|
|
// Disable proxy to prevent file being encrypted again
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
if ($encHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $rawPath . '", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
// Open plain file handle for binary writing, with same filename as original plain file
|
|
$plainHandle = $this->view->fopen($rawPath . '.part', 'wb');
|
|
if ($plainHandle === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'couldn\'t open "' . $rawPath . '.part", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
// Move plain file to a temporary location
|
|
$size = stream_copy_to_stream($encHandle, $plainHandle);
|
|
if ($size === 0) {
|
|
\OCP\Util::writeLog('Encryption library', 'Zero bytes copied of "' . $rawPath . '", decryption failed!', \OCP\Util::FATAL);
|
|
$successful = false;
|
|
continue;
|
|
}
|
|
|
|
fclose($encHandle);
|
|
fclose($plainHandle);
|
|
|
|
$fakeRoot = $this->view->getRoot();
|
|
$this->view->chroot('/' . $this->userId . '/files');
|
|
|
|
$this->view->rename($relPath . '.part', $relPath);
|
|
|
|
//set timestamp
|
|
$this->view->touch($relPath, $timestamp);
|
|
|
|
$this->view->chroot($fakeRoot);
|
|
|
|
// Add the file to the cache
|
|
\OC\Files\Filesystem::putFileInfo($relPath, array(
|
|
'encrypted' => false,
|
|
'size' => $size,
|
|
'unencrypted_size' => 0,
|
|
'etag' => $fileInfo['etag']
|
|
));
|
|
|
|
$decryptedFiles[] = $relPath;
|
|
|
|
}
|
|
|
|
if ($versionStatus) {
|
|
\OC_App::enable('files_versions');
|
|
}
|
|
|
|
if (!$this->decryptVersions($decryptedFiles)) {
|
|
$successful = false;
|
|
}
|
|
|
|
// if there are broken encrypted files than the complete decryption
|
|
// was not successful
|
|
if (!empty($found['broken'])) {
|
|
$successful = false;
|
|
}
|
|
|
|
if ($successful) {
|
|
$this->view->rename($this->keyfilesPath, $this->keyfilesPath . '.backup');
|
|
$this->view->rename($this->shareKeysPath, $this->shareKeysPath . '.backup');
|
|
}
|
|
|
|
\OC_FileProxy::$enabled = true;
|
|
}
|
|
|
|
return $successful;
|
|
}
|
|
|
|
/**
|
|
* @brief Encrypt all files in a directory
|
|
* @param string $dirPath the directory whose files will be encrypted
|
|
* @param null $legacyPassphrase
|
|
* @param null $newPassphrase
|
|
* @return bool
|
|
* @note Encryption is recursive
|
|
*/
|
|
public function encryptAll($dirPath, $legacyPassphrase = null, $newPassphrase = null) {
|
|
|
|
$found = $this->findEncFiles($dirPath);
|
|
|
|
if ($found) {
|
|
|
|
// Disable proxy to prevent file being encrypted twice
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
$versionStatus = \OCP\App::isEnabled('files_versions');
|
|
\OC_App::disable('files_versions');
|
|
|
|
$encryptedFiles = array();
|
|
|
|
// Encrypt unencrypted files
|
|
foreach ($found['plain'] as $plainFile) {
|
|
|
|
//get file info
|
|
$fileInfo = \OC\Files\Filesystem::getFileInfo($plainFile['path']);
|
|
|
|
//relative to data/<user>/file
|
|
$relPath = $plainFile['path'];
|
|
|
|
//relative to /data
|
|
$rawPath = '/' . $this->userId . '/files/' . $plainFile['path'];
|
|
|
|
// keep timestamp
|
|
$timestamp = $fileInfo['mtime'];
|
|
|
|
// Open plain file handle for binary reading
|
|
$plainHandle = $this->view->fopen($rawPath, 'rb');
|
|
|
|
// Open enc file handle for binary writing, with same filename as original plain file
|
|
$encHandle = fopen('crypt://' . $rawPath . '.part', 'wb');
|
|
|
|
if (is_resource($encHandle)) {
|
|
// Move plain file to a temporary location
|
|
$size = stream_copy_to_stream($plainHandle, $encHandle);
|
|
|
|
fclose($encHandle);
|
|
fclose($plainHandle);
|
|
|
|
$fakeRoot = $this->view->getRoot();
|
|
$this->view->chroot('/' . $this->userId . '/files');
|
|
|
|
$this->view->rename($relPath . '.part', $relPath);
|
|
|
|
// set timestamp
|
|
$this->view->touch($relPath, $timestamp);
|
|
|
|
$encSize = $this->view->filesize($relPath);
|
|
|
|
$this->view->chroot($fakeRoot);
|
|
|
|
// Add the file to the cache
|
|
\OC\Files\Filesystem::putFileInfo($relPath, array(
|
|
'encrypted' => true,
|
|
'size' => $encSize,
|
|
'unencrypted_size' => $size,
|
|
'etag' => $fileInfo['etag']
|
|
));
|
|
|
|
$encryptedFiles[] = $relPath;
|
|
}
|
|
}
|
|
|
|
// Encrypt legacy encrypted files
|
|
if (
|
|
!empty($legacyPassphrase)
|
|
&& !empty($newPassphrase)
|
|
) {
|
|
|
|
foreach ($found['legacy'] as $legacyFile) {
|
|
|
|
// Fetch data from file
|
|
$legacyData = $this->view->file_get_contents($legacyFile['path']);
|
|
|
|
// decrypt data, generate catfile
|
|
$decrypted = Crypt::legacyBlockDecrypt($legacyData, $legacyPassphrase);
|
|
|
|
$rawPath = $legacyFile['path'];
|
|
|
|
// enable proxy the ensure encryption is handled
|
|
\OC_FileProxy::$enabled = true;
|
|
|
|
// Open enc file handle for binary writing, with same filename as original plain file
|
|
$encHandle = $this->view->fopen( $rawPath, 'wb' );
|
|
|
|
if (is_resource($encHandle)) {
|
|
|
|
// write data to stream
|
|
fwrite($encHandle, $decrypted);
|
|
|
|
// close stream
|
|
fclose($encHandle);
|
|
}
|
|
|
|
// disable proxy to prevent file being encrypted twice
|
|
\OC_FileProxy::$enabled = false;
|
|
}
|
|
}
|
|
|
|
\OC_FileProxy::$enabled = true;
|
|
|
|
if ($versionStatus) {
|
|
\OC_App::enable('files_versions');
|
|
}
|
|
|
|
$this->encryptVersions($encryptedFiles);
|
|
|
|
// If files were found, return true
|
|
return true;
|
|
} else {
|
|
|
|
// If no files were found, return false
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Return important encryption related paths
|
|
* @param string $pathName Name of the directory to return the path of
|
|
* @return string path
|
|
*/
|
|
public function getPath($pathName) {
|
|
|
|
switch ($pathName) {
|
|
|
|
case 'publicKeyDir':
|
|
|
|
return $this->publicKeyDir;
|
|
|
|
break;
|
|
|
|
case 'encryptionDir':
|
|
|
|
return $this->encryptionDir;
|
|
|
|
break;
|
|
|
|
case 'keyfilesPath':
|
|
|
|
return $this->keyfilesPath;
|
|
|
|
break;
|
|
|
|
case 'publicKeyPath':
|
|
|
|
return $this->publicKeyPath;
|
|
|
|
break;
|
|
|
|
case 'privateKeyPath':
|
|
|
|
return $this->privateKeyPath;
|
|
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief Filter an array of UIDs to return only ones ready for sharing
|
|
* @param array $unfilteredUsers users to be checked for sharing readiness
|
|
* @return array as multi-dimensional array. keys: ready, unready
|
|
*/
|
|
public function filterShareReadyUsers($unfilteredUsers) {
|
|
|
|
// This array will collect the filtered IDs
|
|
$readyIds = $unreadyIds = array();
|
|
|
|
// Loop through users and create array of UIDs that need new keyfiles
|
|
foreach ($unfilteredUsers as $user) {
|
|
|
|
$util = new Util($this->view, $user);
|
|
|
|
// Check that the user is encryption capable, or is the
|
|
// public system user 'ownCloud' (for public shares)
|
|
if (
|
|
$user === $this->publicShareKeyId
|
|
or $user === $this->recoveryKeyId
|
|
or $util->ready()
|
|
) {
|
|
|
|
// Construct array of ready UIDs for Keymanager{}
|
|
$readyIds[] = $user;
|
|
|
|
} else {
|
|
|
|
// Construct array of unready UIDs for Keymanager{}
|
|
$unreadyIds[] = $user;
|
|
|
|
// Log warning; we can't do necessary setup here
|
|
// because we don't have the user passphrase
|
|
\OCP\Util::writeLog('Encryption library',
|
|
'"' . $user . '" is not setup for encryption', \OCP\Util::WARN);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return array(
|
|
'ready' => $readyIds,
|
|
'unready' => $unreadyIds
|
|
);
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief Decrypt a keyfile
|
|
* @param string $filePath
|
|
* @param string $privateKey
|
|
* @return false|string
|
|
*/
|
|
private function decryptKeyfile($filePath, $privateKey) {
|
|
|
|
// Get the encrypted keyfile
|
|
$encKeyfile = Keymanager::getFileKey($this->view, $this, $filePath);
|
|
|
|
// The file has a shareKey and must use it for decryption
|
|
$shareKey = Keymanager::getShareKey($this->view, $this->keyId, $this, $filePath);
|
|
|
|
$plainKeyfile = Crypt::multiKeyDecrypt($encKeyfile, $shareKey, $privateKey);
|
|
|
|
return $plainKeyfile;
|
|
}
|
|
|
|
/**
|
|
* @brief Encrypt keyfile to multiple users
|
|
* @param Session $session
|
|
* @param array $users list of users which should be able to access the file
|
|
* @param string $filePath path of the file to be shared
|
|
* @return bool
|
|
*/
|
|
public function setSharedFileKeyfiles(Session $session, array $users, $filePath) {
|
|
|
|
// Make sure users are capable of sharing
|
|
$filteredUids = $this->filterShareReadyUsers($users);
|
|
|
|
// If we're attempting to share to unready users
|
|
if (!empty($filteredUids['unready'])) {
|
|
|
|
\OCP\Util::writeLog('Encryption library',
|
|
'Sharing to these user(s) failed as they are unready for encryption:"'
|
|
. print_r($filteredUids['unready'], 1), \OCP\Util::WARN);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
// Get public keys for each user, ready for generating sharekeys
|
|
$userPubKeys = Keymanager::getPublicKeys($this->view, $filteredUids['ready']);
|
|
|
|
// Note proxy status then disable it
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
// Get the current users's private key for decrypting existing keyfile
|
|
$privateKey = $session->getPrivateKey();
|
|
|
|
$fileOwner = \OC\Files\Filesystem::getOwner($filePath);
|
|
|
|
// Decrypt keyfile
|
|
$plainKeyfile = $this->decryptKeyfile($filePath, $privateKey);
|
|
|
|
// Re-enc keyfile to (additional) sharekeys
|
|
$multiEncKey = Crypt::multiKeyEncrypt($plainKeyfile, $userPubKeys);
|
|
|
|
// Save the recrypted key to it's owner's keyfiles directory
|
|
// Save new sharekeys to all necessary user directory
|
|
if (
|
|
!Keymanager::setFileKey($this->view, $this, $filePath, $multiEncKey['data'])
|
|
|| !Keymanager::setShareKeys($this->view, $this, $filePath, $multiEncKey['keys'])
|
|
) {
|
|
|
|
\OCP\Util::writeLog('Encryption library',
|
|
'Keyfiles could not be saved for users sharing ' . $filePath, \OCP\Util::ERROR);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
// Return proxy to original status
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Find, sanitise and format users sharing a file
|
|
* @note This wraps other methods into a portable bundle
|
|
* @param boolean $sharingEnabled
|
|
* @param string $filePath path relativ to current users files folder
|
|
*/
|
|
public function getSharingUsersArray($sharingEnabled, $filePath) {
|
|
|
|
$appConfig = \OC::$server->getAppConfig();
|
|
|
|
// Check if key recovery is enabled
|
|
if (
|
|
$appConfig->getValue('files_encryption', 'recoveryAdminEnabled')
|
|
&& $this->recoveryEnabledForUser()
|
|
) {
|
|
$recoveryEnabled = true;
|
|
} else {
|
|
$recoveryEnabled = false;
|
|
}
|
|
|
|
// Make sure that a share key is generated for the owner too
|
|
list($owner, $ownerPath) = $this->getUidAndFilename($filePath);
|
|
|
|
$ownerPath = \OCA\Encryption\Helper::stripPartialFileExtension($ownerPath);
|
|
|
|
// always add owner to the list of users with access to the file
|
|
$userIds = array($owner);
|
|
|
|
if ($sharingEnabled) {
|
|
|
|
// Find out who, if anyone, is sharing the file
|
|
$result = \OCP\Share::getUsersSharingFile($ownerPath, $owner);
|
|
$userIds = \array_merge($userIds, $result['users']);
|
|
if ($result['public']) {
|
|
$userIds[] = $this->publicShareKeyId;
|
|
}
|
|
|
|
}
|
|
|
|
// If recovery is enabled, add the
|
|
// Admin UID to list of users to share to
|
|
if ($recoveryEnabled) {
|
|
// Find recoveryAdmin user ID
|
|
$recoveryKeyId = $appConfig->getValue('files_encryption', 'recoveryKeyId');
|
|
// Add recoveryAdmin to list of users sharing
|
|
$userIds[] = $recoveryKeyId;
|
|
}
|
|
|
|
// check if it is a group mount
|
|
if (\OCP\App::isEnabled("files_external")) {
|
|
$mount = \OC_Mount_Config::getSystemMountPoints();
|
|
foreach ($mount as $mountPoint => $data) {
|
|
if ($mountPoint == substr($ownerPath, 1, strlen($mountPoint))) {
|
|
$userIds = array_merge($userIds, $this->getUserWithAccessToMountPoint($data['applicable']['users'], $data['applicable']['groups']));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Remove duplicate UIDs
|
|
$uniqueUserIds = array_unique($userIds);
|
|
|
|
return $uniqueUserIds;
|
|
|
|
}
|
|
|
|
private function getUserWithAccessToMountPoint($users, $groups) {
|
|
$result = array();
|
|
if (in_array('all', $users)) {
|
|
$result = \OCP\User::getUsers();
|
|
} else {
|
|
$result = array_merge($result, $users);
|
|
foreach ($groups as $group) {
|
|
$result = array_merge($result, \OC_Group::usersInGroup($group));
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @brief set migration status
|
|
* @param int $status
|
|
* @return boolean
|
|
*/
|
|
private function setMigrationStatus($status) {
|
|
|
|
$sql = 'UPDATE `*PREFIX*encryption` SET `migration_status` = ? WHERE `uid` = ?';
|
|
$args = array($status, $this->userId);
|
|
$query = \OCP\DB::prepare($sql);
|
|
$manipulatedRows = $query->execute($args);
|
|
|
|
if ($manipulatedRows === 1) {
|
|
$result = true;
|
|
\OCP\Util::writeLog('Encryption library', "Migration status set to " . self::MIGRATION_OPEN, \OCP\Util::INFO);
|
|
} else {
|
|
$result = false;
|
|
\OCP\Util::writeLog('Encryption library', "Could not set migration status to " . self::MIGRATION_OPEN, \OCP\Util::WARN);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @brief start migration mode to initially encrypt users data
|
|
* @return boolean
|
|
*/
|
|
public function beginMigration() {
|
|
|
|
$result = $this->setMigrationStatus(self::MIGRATION_IN_PROGRESS);
|
|
|
|
if ($result) {
|
|
\OCP\Util::writeLog('Encryption library', "Start migration to encryption mode for " . $this->userId, \OCP\Util::INFO);
|
|
} else {
|
|
\OCP\Util::writeLog('Encryption library', "Could not activate migration mode for " . $this->userId . ". Probably another process already started the initial encryption", \OCP\Util::WARN);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
public function resetMigrationStatus() {
|
|
return $this->setMigrationStatus(self::MIGRATION_OPEN);
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief close migration mode after users data has been encrypted successfully
|
|
* @return boolean
|
|
*/
|
|
public function finishMigration() {
|
|
$result = $this->setMigrationStatus(self::MIGRATION_COMPLETED);
|
|
|
|
if ($result) {
|
|
\OCP\Util::writeLog('Encryption library', "Finish migration successfully for " . $this->userId, \OCP\Util::INFO);
|
|
} else {
|
|
\OCP\Util::writeLog('Encryption library', "Could not deactivate migration mode for " . $this->userId, \OCP\Util::WARN);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @brief check if files are already migrated to the encryption system
|
|
* @return migration status, false = in case of no record
|
|
* @note If records are not being returned, check for a hidden space
|
|
* at the start of the uid in db
|
|
*/
|
|
public function getMigrationStatus() {
|
|
|
|
$sql = 'SELECT `migration_status` FROM `*PREFIX*encryption` WHERE `uid` = ?';
|
|
|
|
$args = array($this->userId);
|
|
$query = \OCP\DB::prepare($sql);
|
|
|
|
$result = $query->execute($args);
|
|
|
|
$migrationStatus = array();
|
|
|
|
if (\OCP\DB::isError($result)) {
|
|
\OCP\Util::writeLog('Encryption library', \OC_DB::getErrorMessage($result), \OCP\Util::ERROR);
|
|
} else {
|
|
$row = $result->fetchRow();
|
|
if ($row && isset($row['migration_status'])) {
|
|
$migrationStatus[] = $row['migration_status'];
|
|
}
|
|
}
|
|
|
|
// If no record is found
|
|
if (empty($migrationStatus)) {
|
|
\OCP\Util::writeLog('Encryption library', "Could not get migration status for " . $this->userId . ", no record found", \OCP\Util::ERROR);
|
|
// insert missing entry in DB with status open if the user exists
|
|
if (\OCP\User::userExists($this->userId)) {
|
|
$sql = 'INSERT INTO `*PREFIX*encryption` (`uid`,`mode`,`recovery_enabled`,`migration_status`) VALUES (?,?,?,?)';
|
|
$args = array(
|
|
$this->userId,
|
|
'server-side',
|
|
0,
|
|
self::MIGRATION_OPEN
|
|
);
|
|
$query = \OCP\DB::prepare($sql);
|
|
$query->execute($args);
|
|
|
|
return self::MIGRATION_OPEN;
|
|
} else {
|
|
return false;
|
|
}
|
|
} else { // If a record is found
|
|
return (int)$migrationStatus[0];
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief get uid of the owners of the file and the path to the file
|
|
* @param string $path Path of the file to check
|
|
* @throws \Exception
|
|
* @note $shareFilePath must be relative to data/UID/files. Files
|
|
* relative to /Shared are also acceptable
|
|
* @return array
|
|
*/
|
|
public function getUidAndFilename($path) {
|
|
|
|
$pathinfo = pathinfo($path);
|
|
$partfile = false;
|
|
$parentFolder = false;
|
|
if (array_key_exists('extension', $pathinfo) && $pathinfo['extension'] === 'part') {
|
|
// if the real file exists we check this file
|
|
$filePath = $this->userFilesDir . '/' .$pathinfo['dirname'] . '/' . $pathinfo['filename'];
|
|
if ($this->view->file_exists($filePath)) {
|
|
$pathToCheck = $pathinfo['dirname'] . '/' . $pathinfo['filename'];
|
|
} else { // otherwise we look for the parent
|
|
$pathToCheck = $pathinfo['dirname'];
|
|
$parentFolder = true;
|
|
}
|
|
$partfile = true;
|
|
} else {
|
|
$pathToCheck = $path;
|
|
}
|
|
|
|
$view = new \OC\Files\View($this->userFilesDir);
|
|
$fileOwnerUid = $view->getOwner($pathToCheck);
|
|
|
|
// handle public access
|
|
if ($this->isPublic) {
|
|
$filename = $path;
|
|
$fileOwnerUid = $this->userId;
|
|
|
|
return array(
|
|
$fileOwnerUid,
|
|
$filename
|
|
);
|
|
} else {
|
|
|
|
// Check that UID is valid
|
|
if (!\OCP\User::userExists($fileOwnerUid)) {
|
|
throw new \Exception(
|
|
'Could not find owner (UID = "' . var_export($fileOwnerUid, 1) . '") of file "' . $path . '"');
|
|
}
|
|
|
|
// NOTE: Bah, this dependency should be elsewhere
|
|
\OC\Files\Filesystem::initMountPoints($fileOwnerUid);
|
|
|
|
// If the file owner is the currently logged in user
|
|
if ($fileOwnerUid === $this->userId) {
|
|
|
|
// Assume the path supplied is correct
|
|
$filename = $path;
|
|
|
|
} else {
|
|
$info = $view->getFileInfo($pathToCheck);
|
|
$ownerView = new \OC\Files\View('/' . $fileOwnerUid . '/files');
|
|
|
|
// Fetch real file path from DB
|
|
$filename = $ownerView->getPath($info['fileid']);
|
|
if ($parentFolder) {
|
|
$filename = $filename . '/'. $pathinfo['filename'];
|
|
}
|
|
|
|
if ($partfile) {
|
|
$filename = $filename . '.' . $pathinfo['extension'];
|
|
}
|
|
|
|
}
|
|
|
|
return array(
|
|
$fileOwnerUid,
|
|
\OC\Files\Filesystem::normalizePath($filename)
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief go recursively through a dir and collect all files and sub files.
|
|
* @param string $dir relative to the users files folder
|
|
* @return array with list of files relative to the users files folder
|
|
*/
|
|
public function getAllFiles($dir, $mountPoint = '') {
|
|
$result = array();
|
|
$dirList = array($dir);
|
|
|
|
while ($dirList) {
|
|
$dir = array_pop($dirList);
|
|
$content = $this->view->getDirectoryContent(\OC\Files\Filesystem::normalizePath(
|
|
$this->userFilesDir . '/' . $dir));
|
|
|
|
foreach ($content as $c) {
|
|
// getDirectoryContent() returns the paths relative to the mount points, so we need
|
|
// to re-construct the complete path
|
|
$path = ($mountPoint !== '') ? $mountPoint . '/' . $c['path'] : $c['path'];
|
|
if ($c['type'] === 'dir') {
|
|
$dirList[] = substr($path, strlen("files"));
|
|
} else {
|
|
$result[] = substr($path, strlen("files"));
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @brief get owner of the shared files.
|
|
* @param $id
|
|
* @internal param int $Id of a share
|
|
* @return string owner
|
|
*/
|
|
public function getOwnerFromSharedFile($id) {
|
|
|
|
$query = \OCP\DB::prepare('SELECT `parent`, `uid_owner` FROM `*PREFIX*share` WHERE `id` = ?', 1);
|
|
|
|
$result = $query->execute(array($id));
|
|
|
|
$source = null;
|
|
if (\OCP\DB::isError($result)) {
|
|
\OCP\Util::writeLog('Encryption library', \OC_DB::getErrorMessage($result), \OCP\Util::ERROR);
|
|
} else {
|
|
$source = $result->fetchRow();
|
|
}
|
|
|
|
$fileOwner = false;
|
|
|
|
if ($source && isset($source['parent'])) {
|
|
|
|
$parent = $source['parent'];
|
|
|
|
while (isset($parent)) {
|
|
|
|
$query = \OCP\DB::prepare('SELECT `parent`, `uid_owner` FROM `*PREFIX*share` WHERE `id` = ?', 1);
|
|
|
|
$result = $query->execute(array($parent));
|
|
|
|
$item = null;
|
|
if (\OCP\DB::isError($result)) {
|
|
\OCP\Util::writeLog('Encryption library', \OC_DB::getErrorMessage($result), \OCP\Util::ERROR);
|
|
} else {
|
|
$item = $result->fetchRow();
|
|
}
|
|
|
|
if ($item && isset($item['parent'])) {
|
|
|
|
$parent = $item['parent'];
|
|
|
|
} else {
|
|
|
|
$fileOwner = $item['uid_owner'];
|
|
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
$fileOwner = $source['uid_owner'];
|
|
|
|
}
|
|
|
|
return $fileOwner;
|
|
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function getUserId() {
|
|
return $this->userId;
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function getKeyId() {
|
|
return $this->keyId;
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function getUserFilesDir() {
|
|
return $this->userFilesDir;
|
|
}
|
|
|
|
/**
|
|
* @param $password
|
|
* @return bool
|
|
*/
|
|
public function checkRecoveryPassword($password) {
|
|
|
|
$result = false;
|
|
$pathKey = '/owncloud_private_key/' . $this->recoveryKeyId . ".private.key";
|
|
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
$recoveryKey = $this->view->file_get_contents($pathKey);
|
|
|
|
$decryptedRecoveryKey = Crypt::decryptPrivateKey($recoveryKey, $password);
|
|
|
|
if ($decryptedRecoveryKey) {
|
|
$result = true;
|
|
}
|
|
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function getRecoveryKeyId() {
|
|
return $this->recoveryKeyId;
|
|
}
|
|
|
|
/**
|
|
* @brief add recovery key to all encrypted files
|
|
*/
|
|
public function addRecoveryKeys($path = '/') {
|
|
$dirContent = $this->view->getDirectoryContent($this->keyfilesPath . $path);
|
|
foreach ($dirContent as $item) {
|
|
// get relative path from files_encryption/keyfiles/
|
|
$filePath = substr($item['path'], strlen('files_encryption/keyfiles'));
|
|
if ($item['type'] === 'dir') {
|
|
$this->addRecoveryKeys($filePath . '/');
|
|
} else {
|
|
$session = new \OCA\Encryption\Session(new \OC\Files\View('/'));
|
|
$sharingEnabled = \OCP\Share::isEnabled();
|
|
// remove '.key' extension from path e.g. 'file.txt.key' to 'file.txt'
|
|
$file = substr($filePath, 0, -4);
|
|
$usersSharing = $this->getSharingUsersArray($sharingEnabled, $file);
|
|
$this->setSharedFileKeyfiles($session, $usersSharing, $file);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief remove recovery key to all encrypted files
|
|
*/
|
|
public function removeRecoveryKeys($path = '/') {
|
|
$dirContent = $this->view->getDirectoryContent($this->keyfilesPath . $path);
|
|
foreach ($dirContent as $item) {
|
|
// get relative path from files_encryption/keyfiles
|
|
$filePath = substr($item['path'], strlen('files_encryption/keyfiles'));
|
|
if ($item['type'] === 'dir') {
|
|
$this->removeRecoveryKeys($filePath . '/');
|
|
} else {
|
|
// remove '.key' extension from path e.g. 'file.txt.key' to 'file.txt'
|
|
$file = substr($filePath, 0, -4);
|
|
$this->view->unlink($this->shareKeysPath . '/' . $file . '.' . $this->recoveryKeyId . '.shareKey');
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief decrypt given file with recovery key and encrypt it again to the owner and his new key
|
|
* @param string $file
|
|
* @param string $privateKey recovery key to decrypt the file
|
|
*/
|
|
private function recoverFile($file, $privateKey) {
|
|
|
|
$sharingEnabled = \OCP\Share::isEnabled();
|
|
|
|
// Find out who, if anyone, is sharing the file
|
|
if ($sharingEnabled) {
|
|
$result = \OCP\Share::getUsersSharingFile($file, $this->userId, true);
|
|
$userIds = $result['users'];
|
|
$userIds[] = $this->recoveryKeyId;
|
|
if ($result['public']) {
|
|
$userIds[] = $this->publicShareKeyId;
|
|
}
|
|
} else {
|
|
$userIds = array(
|
|
$this->userId,
|
|
$this->recoveryKeyId
|
|
);
|
|
}
|
|
$filteredUids = $this->filterShareReadyUsers($userIds);
|
|
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
//decrypt file key
|
|
$encKeyfile = $this->view->file_get_contents($this->keyfilesPath . $file . ".key");
|
|
$shareKey = $this->view->file_get_contents(
|
|
$this->shareKeysPath . $file . "." . $this->recoveryKeyId . ".shareKey");
|
|
$plainKeyfile = Crypt::multiKeyDecrypt($encKeyfile, $shareKey, $privateKey);
|
|
// encrypt file key again to all users, this time with the new public key for the recovered use
|
|
$userPubKeys = Keymanager::getPublicKeys($this->view, $filteredUids['ready']);
|
|
$multiEncKey = Crypt::multiKeyEncrypt($plainKeyfile, $userPubKeys);
|
|
|
|
// write new keys to filesystem TDOO!
|
|
$this->view->file_put_contents($this->keyfilesPath . $file . '.key', $multiEncKey['data']);
|
|
foreach ($multiEncKey['keys'] as $userId => $shareKey) {
|
|
$shareKeyPath = $this->shareKeysPath . $file . '.' . $userId . '.shareKey';
|
|
$this->view->file_put_contents($shareKeyPath, $shareKey);
|
|
}
|
|
|
|
// Return proxy to original status
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
}
|
|
|
|
/**
|
|
* @brief collect all files and recover them one by one
|
|
* @param string $path to look for files keys
|
|
* @param string $privateKey private recovery key which is used to decrypt the files
|
|
*/
|
|
private function recoverAllFiles($path, $privateKey) {
|
|
$dirContent = $this->view->getDirectoryContent($this->keyfilesPath . $path);
|
|
foreach ($dirContent as $item) {
|
|
// get relative path from files_encryption/keyfiles
|
|
$filePath = substr($item['path'], strlen('files_encryption/keyfiles'));
|
|
if ($item['type'] === 'dir') {
|
|
$this->recoverAllFiles($filePath . '/', $privateKey);
|
|
} else {
|
|
// remove '.key' extension from path e.g. 'file.txt.key' to 'file.txt'
|
|
$file = substr($filePath, 0, -4);
|
|
$this->recoverFile($file, $privateKey);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief recover users files in case of password lost
|
|
* @param string $recoveryPassword
|
|
*/
|
|
public function recoverUsersFiles($recoveryPassword) {
|
|
|
|
// Disable encryption proxy to prevent recursive calls
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
\OC_FileProxy::$enabled = false;
|
|
|
|
$encryptedKey = $this->view->file_get_contents(
|
|
'/owncloud_private_key/' . $this->recoveryKeyId . '.private.key');
|
|
$privateKey = Crypt::decryptPrivateKey($encryptedKey, $recoveryPassword);
|
|
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
|
|
|
$this->recoverAllFiles('/', $privateKey);
|
|
}
|
|
|
|
/**
|
|
* @brief check if the file is stored on a system wide mount point
|
|
* @param $path relative to /data/user with leading '/'
|
|
* @return boolean
|
|
*/
|
|
public function isSystemWideMountPoint($path) {
|
|
if (\OCP\App::isEnabled("files_external")) {
|
|
$mount = \OC_Mount_Config::getSystemMountPoints();
|
|
foreach ($mount as $mountPoint => $data) {
|
|
if ($mountPoint == substr($path, 1, strlen($mountPoint))) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief decrypt private key and add it to the current session
|
|
* @param array $params with 'uid' and 'password'
|
|
* @return mixed session or false
|
|
*/
|
|
public function initEncryption($params) {
|
|
|
|
$session = new \OCA\Encryption\Session($this->view);
|
|
|
|
// we tried to initialize the encryption app for this session
|
|
$session->setInitialized(\OCA\Encryption\Session::INIT_EXECUTED);
|
|
|
|
$encryptedKey = Keymanager::getPrivateKey($this->view, $params['uid']);
|
|
|
|
$privateKey = Crypt::decryptPrivateKey($encryptedKey, $params['password']);
|
|
|
|
if ($privateKey === false) {
|
|
\OCP\Util::writeLog('Encryption library', 'Private key for user "' . $params['uid']
|
|
. '" is not valid! Maybe the user password was changed from outside if so please change it back to gain access', \OCP\Util::ERROR);
|
|
return false;
|
|
}
|
|
|
|
$session->setPrivateKey($privateKey);
|
|
$session->setInitialized(\OCA\Encryption\Session::INIT_SUCCESSFUL);
|
|
|
|
return $session;
|
|
}
|
|
|
|
/*
|
|
* @brief remove encryption related keys from the session
|
|
*/
|
|
public function closeEncryptionSession() {
|
|
$session = new \OCA\Encryption\Session($this->view);
|
|
$session->closeSession();
|
|
}
|
|
|
|
}
|