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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Session;
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 {
public const COOKIE_NAME = 'oc_sessionPassphrase';
/** @var IConfig */
protected $config;
/** @var ISession */
protected $session;
/** @var ICrypto */
protected $crypto;
/** @var ISecureRandom */
protected $random;
/** @var string */
protected $passphrase;
/**
* @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->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,
[
'expires' => 0,
'path' => $webRoot,
'domain' => '',
'secure' => $secureCookie,
'httponly' => true,
'samesite' => 'Lax',
]
);
}
}
}
/**
* @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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