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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
*
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Pavel Krasikov <klonishe@gmail.com>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Sam Bull <aa6bs0@sambull.org>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Security\CSP;
use OC\AppFramework\Http\Request;
use OC\Security\CSRF\CsrfTokenManager;
use OCP\IRequest;
/**
* @package OC\Security\CSP
*/
class ContentSecurityPolicyNonceManager {
/** @var CsrfTokenManager */
private $csrfTokenManager;
/** @var IRequest */
private $request;
/** @var string */
private $nonce = '';
/**
* @param CsrfTokenManager $csrfTokenManager
* @param IRequest $request
*/
public function __construct(CsrfTokenManager $csrfTokenManager,
IRequest $request) {
$this->csrfTokenManager = $csrfTokenManager;
$this->request = $request;
}
/**
* Returns the current CSP nounce
*
* @return string
*/
public function getNonce(): string {
if($this->nonce === '') {
if (empty($this->request->server['CSP_NONCE'])) {
$this->nonce = base64_encode($this->csrfTokenManager->getToken()->getEncryptedValue());
} else {
$this->nonce = $this->request->server['CSP_NONCE'];
}
}
return $this->nonce;
}
/**
* Check if the browser supports CSP v3
*
* @return bool
*/
public function browserSupportsCspV3(): bool {
$browserWhitelist = [
Request::USER_AGENT_CHROME,
// Firefox 45+
'/^Mozilla\/5\.0 \([^)]+\) Gecko\/[0-9.]+ Firefox\/(4[5-9]|[5-9][0-9])\.[0-9.]+$/',
// Safari 12+
'/^Mozilla\/5\.0 \([^)]+\) AppleWebKit\/[0-9.]+ \(KHTML, like Gecko\) Version\/(?:1[2-9]|[2-9][0-9])\.[0-9]+(?:\.[0-9]+)? Safari\/[0-9.A-Z]+$/',
];
if($this->request->isUserAgent($browserWhitelist)) {
return true;
}
return false;
}
}
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