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18c013d8fc
When two booleans conflict when merging CSP policies, true will win. Signed-off-by: Vincent Petry <vincent@nextcloud.com>
96 lines
3.1 KiB
PHP
96 lines
3.1 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @license AGPL-3.0
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*
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* This code 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, version 3,
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* as published by the Free Software Foundation.
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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, version 3,
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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 OCP\AppFramework\Http\ContentSecurityPolicy;
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use OCP\AppFramework\Http\EmptyContentSecurityPolicy;
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use OCP\EventDispatcher\IEventDispatcher;
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use OCP\Security\CSP\AddContentSecurityPolicyEvent;
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use OCP\Security\IContentSecurityPolicyManager;
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class ContentSecurityPolicyManager implements IContentSecurityPolicyManager {
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/** @var ContentSecurityPolicy[] */
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private $policies = [];
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/** @var IEventDispatcher */
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private $dispatcher;
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public function __construct(IEventDispatcher $dispatcher) {
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$this->dispatcher = $dispatcher;
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}
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/** {@inheritdoc} */
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public function addDefaultPolicy(EmptyContentSecurityPolicy $policy) {
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$this->policies[] = $policy;
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}
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/**
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* Get the configured default policy. This is not in the public namespace
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* as it is only supposed to be used by core itself.
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*
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* @return ContentSecurityPolicy
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*/
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public function getDefaultPolicy(): ContentSecurityPolicy {
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$event = new AddContentSecurityPolicyEvent($this);
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$this->dispatcher->dispatchTyped($event);
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$defaultPolicy = new \OC\Security\CSP\ContentSecurityPolicy();
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foreach ($this->policies as $policy) {
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$defaultPolicy = $this->mergePolicies($defaultPolicy, $policy);
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}
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return $defaultPolicy;
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}
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/**
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* Merges the first given policy with the second one
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*
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* @param ContentSecurityPolicy $defaultPolicy
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* @param EmptyContentSecurityPolicy $originalPolicy
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* @return ContentSecurityPolicy
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*/
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public function mergePolicies(ContentSecurityPolicy $defaultPolicy,
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EmptyContentSecurityPolicy $originalPolicy): ContentSecurityPolicy {
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foreach ((object)(array)$originalPolicy as $name => $value) {
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$setter = 'set'.ucfirst($name);
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if (\is_array($value)) {
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$getter = 'get'.ucfirst($name);
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$currentValues = \is_array($defaultPolicy->$getter()) ? $defaultPolicy->$getter() : [];
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$defaultPolicy->$setter(array_values(array_unique(array_merge($currentValues, $value))));
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} elseif (\is_bool($value)) {
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$getter = 'is'.ucfirst($name);
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$currentValue = $defaultPolicy->$getter();
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// true wins over false
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if ($value > $currentValue) {
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$defaultPolicy->$setter($value);
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}
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}
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}
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return $defaultPolicy;
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}
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}
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