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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the TYPO3 CMS project. |
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* |
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* It is free software; you can redistribute it and/or modify it under |
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* the terms of the GNU General Public License, either version 2 |
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* of the License, or any later version. |
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* |
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* For the full copyright and license information, please read the |
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* LICENSE.txt file that was distributed with this source code. |
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* |
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* The TYPO3 project - inspiring people to share! |
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*/ |
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namespace TYPO3\CMS\Install\SystemEnvironment\ServerResponse; |
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/** |
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* Evaluates a Content-Security-Policy HTTP header. |
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* |
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* @internal should only be used from within TYPO3 Core |
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*/ |
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class ContentSecurityPolicyHeader |
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{ |
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protected const HEADER_PATTERN = '#(?<directive>default-src|script-src|style-src|object-src)\h+(?<rule>[^;]+)(?:\s*;\s*|$)#'; |
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/** |
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* @var ContentSecurityPolicyDirective[] |
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*/ |
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protected $directives = []; |
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public function __construct(string $header) |
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{ |
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if (preg_match_all(self::HEADER_PATTERN, $header, $matches)) { |
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foreach ($matches['directive'] as $index => $name) { |
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$this->directives[$name] = new ContentSecurityPolicyDirective( |
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$name, |
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$matches['rule'][$index] |
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); |
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} |
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} |
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} |
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public function isEmpty(): bool |
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{ |
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return empty($this->directives); |
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} |
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public function mitigatesCrossSiteScripting(): bool |
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{ |
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$defaultSrc = isset($this->directives['default-src']) |
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? $this->directiveMitigatesCrossSiteScripting($this->directives['default-src']) |
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: null; |
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$scriptSrc = isset($this->directives['script-src']) |
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? $this->directiveMitigatesCrossSiteScripting($this->directives['script-src']) |
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: null; |
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$styleSrc = isset($this->directives['style-src']) |
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? $this->directiveMitigatesCrossSiteScripting($this->directives['style-src']) |
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: null; |
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$objectSrc = isset($this->directives['object-src']) |
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? $this->directiveMitigatesCrossSiteScripting($this->directives['object-src']) |
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: null; |
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return ($scriptSrc ?? $defaultSrc ?? false) |
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&& ($styleSrc ?? $defaultSrc ?? false) |
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&& ($objectSrc ?? $defaultSrc ?? false); |
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} |
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protected function directiveMitigatesCrossSiteScripting(ContentSecurityPolicyDirective $directive): bool |
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{ |
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return $directive->hasInstructions('none') |
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&& !$directive->hasInstructions('unsafe-eval', 'unsafe-inline'); |
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} |
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} |
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TYPO3 /
TYPO3.CMS
