2015-02-24 21:05:19 +03:00
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<?php
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/**
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* @author Clark Tomlinson <clark@owncloud.com>
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* @since 2/19/15, 1:20 PM
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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 OCA\Encryption;
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2015-03-25 00:29:10 +03:00
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use OC\Encryption\Exceptions\DecryptionFailedException;
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2015-02-24 21:05:19 +03:00
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use OC\Encryption\Exceptions\PrivateKeyMissingException;
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use OC\Encryption\Exceptions\PublicKeyMissingException;
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use OCA\Encryption\Crypto\Crypt;
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2015-03-25 00:29:10 +03:00
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use OCP\Encryption\Keys\IStorage;
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use OCP\ICache;
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use OCP\ICacheFactory;
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2015-02-24 21:05:19 +03:00
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use OCP\IConfig;
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2015-03-25 00:29:10 +03:00
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use OCP\ILogger;
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2015-02-24 21:05:19 +03:00
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use OCP\IUserSession;
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2015-03-26 16:13:39 +03:00
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use \OCP\ISession;
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2015-02-24 21:05:19 +03:00
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class KeyManager {
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/**
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2015-03-27 03:35:36 +03:00
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* @var ISession
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2015-03-25 00:29:10 +03:00
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*/
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2015-03-27 03:35:36 +03:00
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public static $session;
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2015-03-25 00:29:10 +03:00
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/**
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* @var IStorage
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2015-02-24 21:05:19 +03:00
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*/
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private $keyStorage;
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/**
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* @var Crypt
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*/
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private $crypt;
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/**
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* @var string
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*/
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private $recoveryKeyId;
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/**
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* @var string
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*/
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private $publicShareKeyId;
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/**
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* @var string UserID
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*/
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private $keyId;
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2015-03-25 00:29:10 +03:00
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/**
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* @var string
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*/
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2015-03-26 14:23:36 +03:00
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private $publicKeyId = 'publicKey';
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2015-03-25 00:29:10 +03:00
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/**
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* @var string
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*/
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2015-03-26 14:23:36 +03:00
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private $privateKeyId = 'privateKey';
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2015-02-24 21:05:19 +03:00
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/**
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* @var string
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*/
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2015-03-26 14:23:36 +03:00
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private $shareKeyId = 'shareKey';
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2015-03-25 00:29:10 +03:00
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2015-02-24 21:05:19 +03:00
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/**
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* @var string
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*/
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2015-03-26 14:23:36 +03:00
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private $fileKeyId = 'fileKey';
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2015-02-24 21:05:19 +03:00
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/**
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* @var IConfig
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*/
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private $config;
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2015-03-25 00:29:10 +03:00
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/**
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* @var ILogger
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*/
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private $log;
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2015-02-24 21:05:19 +03:00
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/**
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2015-03-25 00:29:10 +03:00
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* @param IStorage $keyStorage
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2015-02-24 21:05:19 +03:00
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* @param Crypt $crypt
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* @param IConfig $config
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2015-03-27 03:35:36 +03:00
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* @param IUserSession $userSession
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2015-03-26 16:13:39 +03:00
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* @param \OCP\ISession $session
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2015-03-25 00:29:10 +03:00
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* @param ILogger $log
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2015-02-24 21:05:19 +03:00
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*/
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2015-03-27 20:10:32 +03:00
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public function __construct(
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IStorage $keyStorage,
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Crypt $crypt,
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IConfig $config,
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IUserSession $userSession,
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ISession $session,
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ILogger $log) {
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2015-02-24 21:05:19 +03:00
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2015-03-27 03:35:36 +03:00
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self::$session = $session;
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2015-02-24 21:05:19 +03:00
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$this->keyStorage = $keyStorage;
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$this->crypt = $crypt;
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$this->config = $config;
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2015-03-25 00:29:10 +03:00
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$this->recoveryKeyId = $this->config->getAppValue('encryption',
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'recoveryKeyId');
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$this->publicShareKeyId = $this->config->getAppValue('encryption',
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'publicShareKeyId');
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2015-03-27 20:10:32 +03:00
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if (empty($this->publicShareKeyId)) {
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$this->publicShareKeyId = 'pubShare_' . substr(md5(time()), 0, 8);
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$this->config->setAppValue('encryption', 'publicShareKeyId', $this->publicShareKeyId);
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$keypair = $this->crypt->createKeyPair();
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// Save public key
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$this->keyStorage->setSystemUserKey(
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$this->publicShareKeyId . '.publicKey',
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$keypair['publicKey']);
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// Encrypt private key empty passphrase
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$encryptedKey = $this->crypt->symmetricEncryptFileContent($keypair['privateKey'], '');
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if ($encryptedKey) {
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$this->keyStorage->setSystemUserKey($this->publicShareKeyId . '.privateKey', $encryptedKey);
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} else {
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$this->log->error('Could not create public share keys');
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}
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}
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2015-02-24 21:05:19 +03:00
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$this->keyId = $userSession && $userSession->isLoggedIn() ? $userSession->getUser()->getUID() : false;
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2015-03-25 00:29:10 +03:00
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$this->log = $log;
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}
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/**
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* @return bool
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*/
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public function recoveryKeyExists() {
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2015-03-28 13:02:26 +03:00
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return (!empty($this->keyStorage->getSystemUserKey($this->recoveryKeyId)));
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}
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/**
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* get recovery key
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*
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* @return string
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*/
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public function getRecoveryKey() {
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return $this->keyStorage->getSystemUserKey($this->recoveryKeyId . '.publicKey');
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}
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/**
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* get recovery key ID
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*
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* @return string
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*/
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public function getRecoveryKeyId() {
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return $this->recoveryKeyId;
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2015-03-25 00:29:10 +03:00
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}
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/**
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* @param $password
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* @return bool
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*/
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public function checkRecoveryPassword($password) {
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$recoveryKey = $this->keyStorage->getSystemUserKey($this->recoveryKeyId);
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$decryptedRecoveryKey = $this->crypt->decryptPrivateKey($recoveryKey,
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$password);
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if ($decryptedRecoveryKey) {
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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 $uid
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* @param string $password
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* @param string $keyPair
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* @return bool
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*/
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public function storeKeyPair($uid, $password, $keyPair) {
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// Save Public Key
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$this->setPublicKey($uid, $keyPair['publicKey']);
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$encryptedKey = $this->crypt->symmetricEncryptFileContent($keyPair['privateKey'],
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$password);
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if ($encryptedKey) {
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$this->setPrivateKey($uid, $encryptedKey);
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$this->config->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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* @param $userId
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* @param $key
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* @return bool
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*/
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public function setPublicKey($userId, $key) {
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return $this->keyStorage->setUserKey($userId, $this->publicKeyId, $key);
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}
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/**
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* @param $userId
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* @param $key
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* @return bool
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*/
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public function setPrivateKey($userId, $key) {
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return $this->keyStorage->setUserKey($userId,
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$this->privateKeyId,
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$key);
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}
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2015-03-26 15:37:14 +03:00
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/**
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* write file key to key storage
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*
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* @param string $path
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* @param string $key
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* @return boolean
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*/
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public function setFileKey($path, $key) {
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return $this->keyStorage->setFileKey($path, $this->fileKeyId, $key);
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}
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2015-03-27 13:43:02 +03:00
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/**
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* set all file keys (the file key and the corresponding share keys)
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*
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* @param string $path
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* @param array $keys
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*/
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public function setAllFileKeys($path, $keys) {
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$this->setFileKey($path, $keys['data']);
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foreach ($keys['keys'] as $uid => $keyFile) {
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$this->setShareKey($path, $uid, $keyFile);
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}
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}
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2015-03-26 15:37:14 +03:00
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/**
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* write share key to the key storage
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*
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* @param string $path
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* @param string $uid
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* @param string $key
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* @return boolean
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*/
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public function setShareKey($path, $uid, $key) {
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$keyId = $uid . '.' . $this->shareKeyId;
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return $this->keyStorage->setFileKey($path, $keyId, $key);
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}
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2015-03-25 00:29:10 +03:00
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/**
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* Decrypt private key and store it
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*
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* @param string $uid userid
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* @param string $passPhrase users password
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2015-03-27 03:35:36 +03:00
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* @return ISession
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2015-03-25 00:29:10 +03:00
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*/
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public function init($uid, $passPhrase) {
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try {
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$privateKey = $this->getPrivateKey($uid);
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$privateKey = $this->crypt->decryptPrivateKey($privateKey,
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$passPhrase);
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} catch (PrivateKeyMissingException $e) {
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return false;
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} catch (DecryptionFailedException $e) {
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return false;
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}
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2015-03-26 16:13:39 +03:00
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2015-03-27 03:35:36 +03:00
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self::$session->set('privateKey', $privateKey);
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self::$session->set('initStatus', true);
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2015-03-25 00:29:10 +03:00
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2015-03-27 03:35:36 +03:00
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return self::$session;
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2015-02-24 21:05:19 +03:00
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}
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/**
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* @param $userId
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* @return mixed
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* @throws PrivateKeyMissingException
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*/
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public function getPrivateKey($userId) {
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2015-03-25 00:29:10 +03:00
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$privateKey = $this->keyStorage->getUserKey($userId,
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$this->privateKeyId);
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2015-02-24 21:05:19 +03:00
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if (strlen($privateKey) !== 0) {
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return $privateKey;
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}
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throw new PrivateKeyMissingException();
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}
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/**
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2015-03-25 00:29:10 +03:00
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* @param $path
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2015-03-26 16:13:39 +03:00
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* @param $uid
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* @return string
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2015-02-24 21:05:19 +03:00
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*/
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2015-03-26 16:13:39 +03:00
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public function getFileKey($path, $uid) {
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$key = '';
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2015-03-27 03:35:36 +03:00
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$encryptedFileKey = $this->keyStorage->getFileKey($path,
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$this->fileKeyId);
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2015-03-26 16:13:39 +03:00
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$shareKey = $this->getShareKey($path, $uid);
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2015-03-27 20:10:32 +03:00
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$privateKey = self::$session->get('privateKey');
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2015-03-26 16:13:39 +03:00
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if ($encryptedFileKey && $shareKey && $privateKey) {
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2015-03-27 03:35:36 +03:00
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$key = $this->crypt->multiKeyDecrypt($encryptedFileKey,
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$shareKey,
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$privateKey);
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2015-03-26 16:13:39 +03:00
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}
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return $key;
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2015-03-25 00:29:10 +03:00
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}
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2015-02-24 21:05:19 +03:00
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2015-03-25 00:29:10 +03:00
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/**
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* @param $path
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2015-03-26 16:13:39 +03:00
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* @param $uid
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2015-03-25 00:29:10 +03:00
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* @return mixed
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*/
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2015-03-26 16:13:39 +03:00
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public function getShareKey($path, $uid) {
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$keyId = $uid . '.' . $this->shareKeyId;
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return $this->keyStorage->getFileKey($path, $keyId);
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2015-02-24 21:05:19 +03:00
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}
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/**
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2015-03-25 00:29:10 +03:00
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* Change a user's encryption passphrase
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*
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* @param array $params keys: uid, password
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* @param IUserSession $user
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* @param Util $util
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2015-02-24 21:05:19 +03:00
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* @return bool
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*/
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2015-03-25 00:29:10 +03:00
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public function setPassphrase($params, IUserSession $user, Util $util) {
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2015-03-26 11:58:31 +03:00
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// Get existing decrypted private key
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$privateKey = self::$cacheFactory->get('privateKey');
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2015-03-25 00:29:10 +03:00
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2015-03-26 11:58:31 +03:00
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if ($params['uid'] === $user->getUser()->getUID() && $privateKey) {
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2015-03-25 00:29:10 +03:00
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2015-03-26 11:58:31 +03:00
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// Encrypt private key with new user pwd as passphrase
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2015-03-27 03:35:36 +03:00
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$encryptedPrivateKey = $this->crypt->symmetricEncryptFileContent($privateKey,
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$params['password']);
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2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// Save private key
|
|
|
|
if ($encryptedPrivateKey) {
|
2015-03-27 03:35:36 +03:00
|
|
|
$this->setPrivateKey($user->getUser()->getUID(),
|
|
|
|
$encryptedPrivateKey);
|
2015-03-26 11:58:31 +03:00
|
|
|
} else {
|
|
|
|
$this->log->error('Encryption could not update users encryption password');
|
|
|
|
}
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// NOTE: Session does not need to be updated as the
|
|
|
|
// private key has not changed, only the passphrase
|
|
|
|
// used to decrypt it has changed
|
|
|
|
} else { // admin changed the password for a different user, create new keys and reencrypt file keys
|
|
|
|
$user = $params['uid'];
|
|
|
|
$recoveryPassword = isset($params['recoveryPassword']) ? $params['recoveryPassword'] : null;
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// we generate new keys if...
|
|
|
|
// ...we have a recovery password and the user enabled the recovery key
|
|
|
|
// ...encryption was activated for the first time (no keys exists)
|
|
|
|
// ...the user doesn't have any files
|
|
|
|
if (($util->recoveryEnabledForUser() && $recoveryPassword) || !$this->userHasKeys($user) || !$util->userHasFiles($user)
|
|
|
|
) {
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// backup old keys
|
|
|
|
$this->backupAllKeys('recovery');
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
$newUserPassword = $params['password'];
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
$keypair = $this->crypt->createKeyPair();
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// Disable encryption proxy to prevent recursive calls
|
|
|
|
$proxyStatus = \OC_FileProxy::$enabled;
|
|
|
|
\OC_FileProxy::$enabled = false;
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// Save public key
|
|
|
|
$this->setPublicKey($user, $keypair['publicKey']);
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
// Encrypt private key with new password
|
2015-03-27 03:35:36 +03:00
|
|
|
$encryptedKey = $this->crypt->symmetricEncryptFileContent($keypair['privateKey'],
|
|
|
|
$newUserPassword);
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
if ($encryptedKey) {
|
|
|
|
$this->setPrivateKey($user, $encryptedKey);
|
2015-03-25 00:29:10 +03:00
|
|
|
|
2015-03-26 11:58:31 +03:00
|
|
|
if ($recoveryPassword) { // if recovery key is set we can re-encrypt the key files
|
|
|
|
$util->recoverUsersFiles($recoveryPassword);
|
2015-03-25 00:29:10 +03:00
|
|
|
}
|
2015-03-26 11:58:31 +03:00
|
|
|
} else {
|
|
|
|
$this->log->error('Encryption Could not update users encryption password');
|
2015-03-25 00:29:10 +03:00
|
|
|
}
|
2015-03-26 11:58:31 +03:00
|
|
|
|
|
|
|
\OC_FileProxy::$enabled = $proxyStatus;
|
2015-03-25 00:29:10 +03:00
|
|
|
}
|
|
|
|
}
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @param $userId
|
|
|
|
* @return bool
|
|
|
|
*/
|
|
|
|
public function userHasKeys($userId) {
|
|
|
|
try {
|
|
|
|
$this->getPrivateKey($userId);
|
|
|
|
$this->getPublicKey($userId);
|
|
|
|
} catch (PrivateKeyMissingException $e) {
|
|
|
|
return false;
|
|
|
|
} catch (PublicKeyMissingException $e) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param $userId
|
|
|
|
* @return mixed
|
|
|
|
* @throws PublicKeyMissingException
|
2015-02-24 21:05:19 +03:00
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
public function getPublicKey($userId) {
|
|
|
|
$publicKey = $this->keyStorage->getUserKey($userId, $this->publicKeyId);
|
2015-02-24 21:05:19 +03:00
|
|
|
|
2015-03-25 00:29:10 +03:00
|
|
|
if (strlen($publicKey) !== 0) {
|
|
|
|
return $publicKey;
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
2015-03-25 00:29:10 +03:00
|
|
|
throw new PublicKeyMissingException();
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
2015-03-27 20:10:32 +03:00
|
|
|
public function getPublicShareKeyId() {
|
|
|
|
return $this->publicShareKeyId;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* get public key for public link shares
|
|
|
|
*
|
|
|
|
* @return string
|
|
|
|
*/
|
|
|
|
public function getPublicShareKey() {
|
|
|
|
return $this->keyStorage->getSystemUserKey($this->publicShareKeyId . '.publicKey');
|
|
|
|
}
|
|
|
|
|
2015-02-24 21:05:19 +03:00
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param $purpose
|
|
|
|
* @param bool $timestamp
|
|
|
|
* @param bool $includeUserKeys
|
2015-02-24 21:05:19 +03:00
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
public function backupAllKeys($purpose, $timestamp = true, $includeUserKeys = true) {
|
|
|
|
// $backupDir = $this->keyStorage->;
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param string $uid
|
2015-02-24 21:05:19 +03:00
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
public function replaceUserKeys($uid) {
|
|
|
|
$this->backupAllKeys('password_reset');
|
|
|
|
$this->deletePublicKey($uid);
|
|
|
|
$this->deletePrivateKey($uid);
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param $uid
|
2015-02-24 21:05:19 +03:00
|
|
|
* @return bool
|
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
public function deletePublicKey($uid) {
|
|
|
|
return $this->keyStorage->deleteUserKey($uid, $this->publicKeyId);
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param $uid
|
2015-02-24 21:05:19 +03:00
|
|
|
* @return bool
|
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
private function deletePrivateKey($uid) {
|
|
|
|
return $this->keyStorage->deleteUserKey($uid, $this->privateKeyId);
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|
|
|
|
|
2015-03-27 13:43:02 +03:00
|
|
|
public function deleteAllFileKeys($path) {
|
|
|
|
return $this->keyStorage->deleteAllFileKeys($path);
|
|
|
|
}
|
|
|
|
|
2015-02-24 21:05:19 +03:00
|
|
|
/**
|
2015-03-25 00:29:10 +03:00
|
|
|
* @param array $userIds
|
|
|
|
* @return array
|
|
|
|
* @throws PublicKeyMissingException
|
2015-02-24 21:05:19 +03:00
|
|
|
*/
|
2015-03-25 00:29:10 +03:00
|
|
|
public function getPublicKeys(array $userIds) {
|
|
|
|
$keys = [];
|
2015-02-24 21:05:19 +03:00
|
|
|
|
2015-03-25 00:29:10 +03:00
|
|
|
foreach ($userIds as $userId) {
|
|
|
|
try {
|
|
|
|
$keys[$userId] = $this->getPublicKey($userId);
|
|
|
|
} catch (PublicKeyMissingException $e) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
}
|
2015-02-24 21:05:19 +03:00
|
|
|
|
2015-03-25 00:29:10 +03:00
|
|
|
return $keys;
|
2015-02-24 21:05:19 +03:00
|
|
|
|
|
|
|
}
|
2015-03-27 03:35:36 +03:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @return string returns openssl key
|
|
|
|
*/
|
|
|
|
public function getSystemPrivateKey() {
|
|
|
|
return $this->keyStorage->getSystemUserKey($this->privateKeyId);
|
|
|
|
}
|
2015-02-24 21:05:19 +03:00
|
|
|
}
|