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<?php
/**
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Phil Davis <phil.davis@inf.org>
*
* @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 OC\Session;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use OCP\IRequest;
use OCP\ISession;
use OCP\Security\ICrypto;
use OCP\Security\ISecureRandom;
/**
* Class CryptoWrapper provides some rough basic level of additional security by
* storing the session data in an encrypted form.
*
* The content of the session is encrypted using another cookie sent by the browser.
* One should note that an adversary with access to the source code or the system
* memory is still able to read the original session ID from the users' request.
* This thus can not be considered a strong security measure one should consider
* it as an additional small security obfuscation layer to comply with compliance
* guidelines.
*
* TODO: Remove this in a future release with an approach such as
* https://github.com/owncloud/core/pull/17866
*
* @package OC\Session
*/
class CryptoWrapper {
const COOKIE_NAME = 'oc_sessionPassphrase';
/** @var ISession */
protected $session;
/** @var \OCP\Security\ICrypto */
protected $crypto;
/** @var ISecureRandom */
protected $random;
/**
* @param IConfig $config
* @param ICrypto $crypto
* @param ISecureRandom $random
* @param IRequest $request
*/
public function __construct(IConfig $config,
ICrypto $crypto,
ISecureRandom $random,
IRequest $request) {
$this->crypto = $crypto;
$this->config = $config;
$this->random = $random;
if (!is_null($request->getCookie(self::COOKIE_NAME))) {
$this->passphrase = $request->getCookie(self::COOKIE_NAME);
} else {
$this->passphrase = $this->random->getMediumStrengthGenerator()->generate(128);
$secureCookie = $request->getServerProtocol() === 'https';
// FIXME: Required for CI
if (!defined('PHPUNIT_RUN')) {
$webRoot = \OC::$WEBROOT;
if($webRoot === '') {
$webRoot = '/';
}
setcookie(self::COOKIE_NAME, $this->passphrase, 0, $webRoot, '', $secureCookie, true);
}
}
}
/**
* @param ISession $session
* @return ISession
*/
public function wrapSession(ISession $session) {
if (!($session instanceof CryptoSessionData)) {
return new CryptoSessionData($session, $this->crypto, $this->passphrase);
}
return $session;
}
}
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