nextcloud/apps/encryption/hooks/userhooks.php

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<?php
/**
* @author Björn Schießle <schiessle@owncloud.com>
* @author Clark Tomlinson <fallen013@gmail.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Encryption\Hooks;
use OCP\Util as OCUtil;
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use OCA\Encryption\Hooks\Contracts\IHook;
use OCA\Encryption\KeyManager;
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use OCA\Encryption\Crypto\Crypt;
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use OCA\Encryption\Users\Setup;
use OCP\App;
use OCP\ILogger;
use OCP\IUserSession;
use OCA\Encryption\Util;
use OCA\Encryption\Session;
use OCA\Encryption\Recovery;
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class UserHooks implements IHook {
/**
* @var KeyManager
*/
private $keyManager;
/**
* @var ILogger
*/
private $logger;
/**
* @var Setup
*/
private $userSetup;
/**
* @var IUserSession
*/
private $user;
/**
* @var Util
*/
private $util;
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/**
* @var Session
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*/
private $session;
/**
* @var Recovery
*/
private $recovery;
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/**
* @var Crypt
*/
private $crypt;
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/**
* UserHooks constructor.
*
* @param KeyManager $keyManager
* @param ILogger $logger
* @param Setup $userSetup
* @param IUserSession $user
* @param Util $util
* @param Session $session
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* @param Crypt $crypt
* @param Recovery $recovery
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*/
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public function __construct(KeyManager $keyManager,
ILogger $logger,
Setup $userSetup,
IUserSession $user,
Util $util,
Session $session,
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Crypt $crypt,
Recovery $recovery) {
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$this->keyManager = $keyManager;
$this->logger = $logger;
$this->userSetup = $userSetup;
$this->user = $user;
$this->util = $util;
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$this->session = $session;
$this->recovery = $recovery;
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$this->crypt = $crypt;
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}
/**
* Connects Hooks
*
* @return null
*/
public function addHooks() {
OCUtil::connectHook('OC_User', 'post_login', $this, 'login');
OCUtil::connectHook('OC_User', 'logout', $this, 'logout');
OCUtil::connectHook('OC_User',
'post_setPassword',
$this,
'setPassphrase');
OCUtil::connectHook('OC_User',
'pre_setPassword',
$this,
'preSetPassphrase');
OCUtil::connectHook('OC_User',
'post_createUser',
$this,
'postCreateUser');
OCUtil::connectHook('OC_User',
'post_deleteUser',
$this,
'postDeleteUser');
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}
/**
* Startup encryption backend upon user login
*
* @note This method should never be called for users using client side encryption
* @param array $params
* @return bool
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*/
public function login($params) {
if (!App::isEnabled('encryption')) {
return true;
}
// ensure filesystem is loaded
if (!\OC\Files\Filesystem::$loaded) {
\OC_Util::setupFS($params['uid']);
}
// setup user, if user not ready force relogin
if (!$this->userSetup->setupUser($params['uid'], $params['password'])) {
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return false;
}
$this->keyManager->init($params['uid'], $params['password']);
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}
/**
* remove keys from session during logout
*/
public function logout() {
$this->session->clear();
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}
/**
* setup encryption backend upon user created
*
* @note This method should never be called for users using client side encryption
* @param array $params
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*/
public function postCreateUser($params) {
if (App::isEnabled('encryption')) {
$this->userSetup->setupUser($params['uid'], $params['password']);
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}
}
/**
* cleanup encryption backend upon user deleted
*
* @param array $params : uid, password
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* @note This method should never be called for users using client side encryption
*/
public function postDeleteUser($params) {
if (App::isEnabled('encryption')) {
$this->keyManager->deletePublicKey($params['uid']);
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}
}
/**
* If the password can't be changed within ownCloud, than update the key password in advance.
*
* @param array $params : uid, password
* @return bool
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*/
public function preSetPassphrase($params) {
if (App::isEnabled('encryption')) {
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$user = $this->user->getUser();
if ($user && !$user->canChangePassword()) {
$this->setPassphrase($params);
}
}
}
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/**
* Change a user's encryption passphrase
*
* @param array $params keys: uid, password
* @return bool
*/
public function setPassphrase($params) {
// Get existing decrypted private key
$privateKey = $this->session->getPrivateKey();
$user = $this->user->getUser();
// current logged in user changes his own password
if ($user && $params['uid'] === $user->getUID() && $privateKey) {
// Encrypt private key with new user pwd as passphrase
$encryptedPrivateKey = $this->crypt->symmetricEncryptFileContent($privateKey,
$params['password']);
// Save private key
if ($encryptedPrivateKey) {
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$this->keyManager->setPrivateKey($this->user->getUser()->getUID(),
$this->crypt->generateHeader() . $encryptedPrivateKey);
} else {
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$this->logger->error('Encryption could not update users encryption password');
}
// 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 re-encrypt file keys
$user = $params['uid'];
$recoveryPassword = isset($params['recoveryPassword']) ? $params['recoveryPassword'] : null;
// we generate new keys if...
// ...we have a recovery password and the user enabled the recovery key
// ...encryption was activated for the first time (no keys exists)
// ...the user doesn't have any files
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if (
($this->recovery->isRecoveryEnabledForUser($user) && $recoveryPassword)
|| !$this->keyManager->userHasKeys($user)
|| !$this->util->userHasFiles($user)
) {
// backup old keys
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//$this->backupAllKeys('recovery');
$newUserPassword = $params['password'];
$keyPair = $this->crypt->createKeyPair();
// Save public key
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$this->keyManager->setPublicKey($user, $keyPair['publicKey']);
// Encrypt private key with new password
$encryptedKey = $this->crypt->symmetricEncryptFileContent($keyPair['privateKey'],
$newUserPassword);
if ($encryptedKey) {
$this->keyManager->setPrivateKey($user, $this->crypt->generateHeader() . $encryptedKey);
if ($recoveryPassword) { // if recovery key is set we can re-encrypt the key files
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$this->recovery->recoverUsersFiles($recoveryPassword, $user);
}
} else {
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$this->logger->error('Encryption Could not update users encryption password');
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}
}
}
}
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/**
* after password reset we create a new key pair for the user
*
* @param array $params
*/
public function postPasswordReset($params) {
$password = $params['password'];
$this->keyManager->replaceUserKeys($params['uid']);
$this->userSetup->setupServerSide($params['uid'], $password);
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}
}