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<?php
/**
* @author Björn Schießle <schiessle@owncloud.com>
* @author Florin Peter <github@florin-peter.de>
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author Sam Tuke <mail@samtuke.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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\Files_Encryption;
/**
* Class for handling encryption related session data
*/
class Session {
private $view;
private static $publicShareKey = false;
const NOT_INITIALIZED = '0';
const INIT_EXECUTED = '1';
const INIT_SUCCESSFUL = '2';
/**
* if session is started, check if ownCloud key pair is set up, if not create it
* @param \OC\Files\View $view
*
* @note The ownCloud key pair is used to allow public link sharing even if encryption is enabled
*/
public function __construct($view) {
$this->view = $view;
if (!$this->view->is_dir('files_encryption')) {
$this->view->mkdir('files_encryption');
}
$appConfig = \OC::$server->getAppConfig();
$publicShareKeyId = Helper::getPublicShareKeyId();
if ($publicShareKeyId === false) {
$publicShareKeyId = 'pubShare_' . substr(md5(time()), 0, 8);
$appConfig->setValue('files_encryption', 'publicShareKeyId', $publicShareKeyId);
}
if (!Keymanager::publicShareKeyExists($view)) {
$keypair = Crypt::createKeypair();
// Save public key
Keymanager::setPublicKey($keypair['publicKey'], $publicShareKeyId);
// Encrypt private key empty passphrase
$cipher = Helper::getCipher();
$encryptedKey = Crypt::symmetricEncryptFileContent($keypair['privateKey'], '', $cipher);
if ($encryptedKey) {
Keymanager::setPrivateSystemKey($encryptedKey, $publicShareKeyId);
} else {
\OCP\Util::writeLog('files_encryption', 'Could not create public share keys', \OCP\Util::ERROR);
}
}
if (Helper::isPublicAccess() && !self::getPublicSharePrivateKey()) {
// Disable encryption proxy to prevent recursive calls
$proxyStatus = \OC_FileProxy::$enabled;
\OC_FileProxy::$enabled = false;
$encryptedKey = Keymanager::getPrivateSystemKey($publicShareKeyId);
$privateKey = Crypt::decryptPrivateKey($encryptedKey, '');
self::setPublicSharePrivateKey($privateKey);
\OC_FileProxy::$enabled = $proxyStatus;
}
}
/**
* Sets user private key to session
* @param string $privateKey
* @return bool
*
* @note this should only be set on login
*/
public function setPrivateKey($privateKey) {
\OC::$server->getSession()->set('privateKey', $privateKey);
return true;
}
/**
* remove keys from session
*/
public function removeKeys() {
\OC::$server->getSession()->remove('publicSharePrivateKey');
\OC::$server->getSession()->remove('privateKey');
}
/**
* Sets status of encryption app
* @param string $init INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
* @return bool
*
* @note this doesn not indicate of the init was successful, we just remeber the try!
*/
public function setInitialized($init) {
\OC::$server->getSession()->set('encryptionInitialized', $init);
return true;
}
/**
* remove encryption keys and init status from session
*/
public function closeSession() {
\OC::$server->getSession()->remove('encryptionInitialized');
\OC::$server->getSession()->remove('privateKey');
}
/**
* Gets status if we already tried to initialize the encryption app
* @return string init status INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
*
* @note this doesn not indicate of the init was successful, we just remeber the try!
*/
public function getInitialized() {
if (!is_null(\OC::$server->getSession()->get('encryptionInitialized'))) {
return \OC::$server->getSession()->get('encryptionInitialized');
} else if (Helper::isPublicAccess() && self::getPublicSharePrivateKey()) {
return self::INIT_SUCCESSFUL;
} else {
return self::NOT_INITIALIZED;
}
}
/**
* Gets user or public share private key from session
* @return string $privateKey The user's plaintext private key
*
*/
public function getPrivateKey() {
// return the public share private key if this is a public access
if (Helper::isPublicAccess()) {
return self::getPublicSharePrivateKey();
} else {
if (!is_null(\OC::$server->getSession()->get('privateKey'))) {
return \OC::$server->getSession()->get('privateKey');
} else {
return false;
}
}
}
/**
* Sets public user private key to session
* @param string $privateKey
* @return bool
*/
private static function setPublicSharePrivateKey($privateKey) {
self::$publicShareKey = $privateKey;
return true;
}
/**
* Gets public share private key from session
* @return string $privateKey
*
*/
private static function getPublicSharePrivateKey() {
return self::$publicShareKey;
}
}
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