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<?php
/**
* @author Björn Schießle <schiessle@owncloud.com>
*
* @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\Federation\API;
use OCA\Federation\DbHandler;
use OCA\Federation\TrustedServers;
use OCP\AppFramework\Http;
use OCP\BackgroundJob\IJobList;
use OCP\ILogger;
use OCP\IRequest;
use OCP\Security\ISecureRandom;
use OCP\Security\StringUtils;
/**
* Class OCSAuthAPI
*
* OCS API end-points to exchange shared secret between two connected ownClouds
*
* @package OCA\Federation\API
*/
class OCSAuthAPI {
/** @var IRequest */
private $request;
/** @var ISecureRandom */
private $secureRandom;
/** @var IJobList */
private $jobList;
/** @var TrustedServers */
private $trustedServers;
/** @var DbHandler */
private $dbHandler;
/** @var ILogger */
private $logger;
/**
* OCSAuthAPI constructor.
*
* @param IRequest $request
* @param ISecureRandom $secureRandom
* @param IJobList $jobList
* @param TrustedServers $trustedServers
* @param DbHandler $dbHandler
* @param ILogger $logger
*/
public function __construct(
IRequest $request,
ISecureRandom $secureRandom,
IJobList $jobList,
TrustedServers $trustedServers,
DbHandler $dbHandler,
ILogger $logger
) {
$this->request = $request;
$this->secureRandom = $secureRandom;
$this->jobList = $jobList;
$this->trustedServers = $trustedServers;
$this->dbHandler = $dbHandler;
$this->logger = $logger;
}
/**
* request received to ask remote server for a shared secret
*
* @return \OC_OCS_Result
*/
public function requestSharedSecret() {
$url = $this->request->getParam('url');
$token = $this->request->getParam('token');
if ($this->trustedServers->isTrustedServer($url) === false) {
$this->logger->log(\OCP\Util::ERROR, 'remote server not trusted (' . $url . ') while requesting shared secret');
return new \OC_OCS_Result(null, HTTP::STATUS_FORBIDDEN);
}
// if both server initiated the exchange of the shared secret the greater
// token wins
$localToken = $this->dbHandler->getToken($url);
if (strcmp($localToken, $token) > 0) {
$this->logger->log(\OCP\Util::ERROR, 'remote server (' . $url . ') presented lower token');
return new \OC_OCS_Result(null, HTTP::STATUS_FORBIDDEN);
}
$this->jobList->add(
'OCA\Federation\BackgroundJob\GetSharedSecret',
[
'url' => $url,
'token' => $token,
]
);
return new \OC_OCS_Result(null, Http::STATUS_OK);
}
/**
* create shared secret and return it
*
* @return \OC_OCS_Result
*/
public function getSharedSecret() {
$url = $this->request->getParam('url');
$token = $this->request->getParam('token');
if ($this->trustedServers->isTrustedServer($url) === false) {
$this->logger->log(\OCP\Util::ERROR, 'remote server not trusted (' . $url . ') while getting shared secret');
return new \OC_OCS_Result(null, HTTP::STATUS_FORBIDDEN);
}
if ($this->isValidToken($url, $token) === false) {
$this->logger->log(\OCP\Util::ERROR, 'remote server (' . $url . ') didn\'t send a valid token (got ' . $token . ') while getting shared secret');
return new \OC_OCS_Result(null, HTTP::STATUS_FORBIDDEN);
}
$sharedSecret = $this->secureRandom->generate(32);
$this->trustedServers->addSharedSecret($url, $sharedSecret);
// reset token after the exchange of the shared secret was successful
$this->dbHandler->addToken($url, '');
return new \OC_OCS_Result(['sharedSecret' => $sharedSecret], Http::STATUS_OK);
}
protected function isValidToken($url, $token) {
$storedToken = $this->dbHandler->getToken($url);
return hash_equals($storedToken, $token);
}
}
|
