95 lines
2.5 KiB
PHP
95 lines
2.5 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
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*
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Sam Bull <aa6bs0@sambull.org>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Security\CSP;
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use OC\AppFramework\Http\Request;
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use OC\Security\CSRF\CsrfTokenManager;
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use OCP\IRequest;
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/**
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* @package OC\Security\CSP
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*/
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class ContentSecurityPolicyNonceManager {
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/** @var CsrfTokenManager */
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private $csrfTokenManager;
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/** @var IRequest */
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private $request;
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/** @var string */
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private $nonce = '';
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/**
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* @param CsrfTokenManager $csrfTokenManager
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* @param IRequest $request
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*/
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public function __construct(CsrfTokenManager $csrfTokenManager,
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IRequest $request) {
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$this->csrfTokenManager = $csrfTokenManager;
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$this->request = $request;
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}
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/**
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* Returns the current CSP nounce
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*
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* @return string
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*/
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public function getNonce(): string {
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if($this->nonce === '') {
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if (empty($this->request->server['CSP_NONCE'])) {
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$this->nonce = base64_encode($this->csrfTokenManager->getToken()->getEncryptedValue());
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} else {
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$this->nonce = $this->request->server['CSP_NONCE'];
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}
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}
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return $this->nonce;
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}
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/**
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* Check if the browser supports CSP v3
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*
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* @return bool
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*/
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public function browserSupportsCspV3(): bool {
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$browserWhitelist = [
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Request::USER_AGENT_CHROME,
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// Firefox 45+
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'/^Mozilla\/5\.0 \([^)]+\) Gecko\/[0-9.]+ Firefox\/(4[5-9]|[5-9][0-9])\.[0-9.]+$/',
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// Safari 12+
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'/^Mozilla\/5\.0 \([^)]+\) AppleWebKit\/[0-9.]+ \(KHTML, like Gecko\) Version\/(1[2-9]|[2-9][0-9])\.[0-9]+ Safari\/[0-9.A-Z]+$/',
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];
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if($this->request->isUserAgent($browserWhitelist)) {
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return true;
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}
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return false;
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}
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}
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