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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Björn Schießle <bjoern@schiessle.org>
*
* @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\Crypto;
use OCA\Encryption\KeyManager;
use OCA\Encryption\Session;
use OCA\Encryption\Util;
use Symfony\Component\Console\Helper\QuestionHelper;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\ConfirmationQuestion;
use Symfony\Component\Console\Question\Question;
class DecryptAll {
/** @var Util */
protected $util;
/** @var QuestionHelper */
protected $questionHelper;
/** @var Crypt */
protected $crypt;
/** @var KeyManager */
protected $keyManager;
/** @var Session */
protected $session;
/**
* @param Util $util
* @param KeyManager $keyManager
* @param Crypt $crypt
* @param Session $session
* @param QuestionHelper $questionHelper
*/
public function __construct(
Util $util,
KeyManager $keyManager,
Crypt $crypt,
Session $session,
QuestionHelper $questionHelper
) {
$this->util = $util;
$this->keyManager = $keyManager;
$this->crypt = $crypt;
$this->session = $session;
$this->questionHelper = $questionHelper;
}
/**
* prepare encryption module to decrypt all files
*
* @param InputInterface $input
* @param OutputInterface $output
* @param $user
* @return bool
*/
public function prepare(InputInterface $input, OutputInterface $output, $user) {
$question = new Question('Please enter the recovery key password: ');
if ($this->util->isMasterKeyEnabled()) {
$output->writeln('Use master key to decrypt all files');
$user = $this->keyManager->getMasterKeyId();
$password =$this->keyManager->getMasterKeyPassword();
} else {
$recoveryKeyId = $this->keyManager->getRecoveryKeyId();
if (!empty($user)) {
$output->writeln('You can only decrypt the users files if you know');
$output->writeln('the users password or if he activated the recovery key.');
$output->writeln('');
$questionUseLoginPassword = new ConfirmationQuestion(
'Do you want to use the users login password to decrypt all files? (y/n) ',
false
);
$useLoginPassword = $this->questionHelper->ask($input, $output, $questionUseLoginPassword);
if ($useLoginPassword) {
$question = new Question('Please enter the user\'s login password: ');
} elseif ($this->util->isRecoveryEnabledForUser($user) === false) {
$output->writeln('No recovery key available for user ' . $user);
return false;
} else {
$user = $recoveryKeyId;
}
} else {
$output->writeln('You can only decrypt the files of all users if the');
$output->writeln('recovery key is enabled by the admin and activated by the users.');
$output->writeln('');
$user = $recoveryKeyId;
}
$question->setHidden(true);
$question->setHiddenFallback(false);
$password = $this->questionHelper->ask($input, $output, $question);
}
$privateKey = $this->getPrivateKey($user, $password);
if ($privateKey !== false) {
$this->updateSession($user, $privateKey);
return true;
} else {
$output->writeln('Could not decrypt private key, maybe you entered the wrong password?');
}
return false;
}
/**
* get the private key which will be used to decrypt all files
*
* @param string $user
* @param string $password
* @return bool|string
* @throws \OCA\Encryption\Exceptions\PrivateKeyMissingException
*/
protected function getPrivateKey($user, $password) {
$recoveryKeyId = $this->keyManager->getRecoveryKeyId();
$masterKeyId = $this->keyManager->getMasterKeyId();
if ($user === $recoveryKeyId) {
$recoveryKey = $this->keyManager->getSystemPrivateKey($recoveryKeyId);
$privateKey = $this->crypt->decryptPrivateKey($recoveryKey, $password);
} elseif ($user === $masterKeyId) {
$masterKey = $this->keyManager->getSystemPrivateKey($masterKeyId);
$privateKey = $this->crypt->decryptPrivateKey($masterKey, $password, $masterKeyId);
} else {
$userKey = $this->keyManager->getPrivateKey($user);
$privateKey = $this->crypt->decryptPrivateKey($userKey, $password, $user);
}
return $privateKey;
}
protected function updateSession($user, $privateKey) {
$this->session->prepareDecryptAll($user, $privateKey);
}
}
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