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<?php declare(strict_types=1); |
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/** |
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* @license http://opensource.org/licenses/mit-license.php MIT |
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* @link https://github.com/nicoSWD |
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* @author Nicolas Oelgart <[email protected]> |
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*/ |
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namespace nicoSWD\SecHeaderCheck\Domain\Validator\Header; |
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use nicoSWD\SecHeaderCheck\Domain\Result\Result\ContentSecurityPolicyHeaderResult; |
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use nicoSWD\SecHeaderCheck\Domain\Validator\AbstractHeaderParser; |
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final class ContentSecurityPolicyHeader extends AbstractHeaderParser |
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{ |
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private const DEFAULT_SRC = 'default-src'; |
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private const SCRIPT_SRC = 'script-src'; |
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private const IMG_SRC = 'img-src'; |
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private const FRAME_ANCESTORS = 'frame-ancestors'; |
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private const REPORT_URI = 'report-uri'; |
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private const CONNECT_SRC = 'connect-src'; |
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private const STYLE_SRC = 'style-src'; |
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private const SANDBOX = 'sandbox'; |
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private const EXPECTED_DIRECTIVES = [ |
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self::SCRIPT_SRC, |
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self::IMG_SRC, |
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self::FRAME_ANCESTORS, |
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self::REPORT_URI, |
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self::CONNECT_SRC, |
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self::STYLE_SRC, |
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]; |
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private $foundDirectives = []; |
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public function parse(): ContentSecurityPolicyHeaderResult |
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{ |
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foreach ($this->getDirectives($this->getValue()) as $directive) { |
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[$directiveName, $policy] = $this->parseDirectiveNameAndPolicy($directive); |
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switch ($directiveName) { |
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case self::DEFAULT_SRC: |
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case self::IMG_SRC: |
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case self::SCRIPT_SRC: |
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case self::FRAME_ANCESTORS: |
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case self::REPORT_URI: |
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case self::CONNECT_SRC: |
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case self::STYLE_SRC: |
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case self::SANDBOX: |
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if ($this->hasValidPolicy($policy)) { |
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$this->foundDirectives[] = $directiveName; |
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} else { |
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// $this->addWarning(new ContentSecurityPolicyInvalidWarning()); |
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} |
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break; |
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default: |
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// $this->addWarning(new ContentSecurityPolicyWithInvalidDirectiveWarning($directiveName)); |
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break; |
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} |
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} |
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$missingDirectives = $this->getMissingDirectives(); |
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if (count($missingDirectives) > 0) { |
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if (!in_array(self::FRAME_ANCESTORS, $missingDirectives, true)) { |
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// $this->addWarning(new ContentSecurityPolicyMissingFrameAncestorsDirective()); |
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} else { |
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// $this->addWarning(new ContentSecurityPolicyWithMissingDirectiveWarning(implode(', ', $missingDirectives))); |
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} |
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} |
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$contentSecurityPolicyResult = new ContentSecurityPolicyHeaderResult($this->getName(), $this->getValue()); |
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return $contentSecurityPolicyResult; |
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} |
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private function parseDirectiveNameAndPolicy(string $directiveAndValues): array |
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{ |
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$directiveAndValues = $this->splitSkipEmpty('~[ ]~', $directiveAndValues); |
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$directiveName = array_shift($directiveAndValues); |
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return [strtolower($directiveName), $directiveAndValues]; |
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} |
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private function hasValidPolicy(array $values): bool |
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{ |
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return true; |
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} |
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private function getDirectives(string $header): array |
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{ |
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return $this->splitSkipEmpty('~;~', $header); |
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} |
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private function splitSkipEmpty(string $regex, string $header): array |
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{ |
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return array_map('trim', preg_split($regex, $header, -1, PREG_SPLIT_NO_EMPTY)); |
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} |
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private function getMissingDirectives(): array |
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{ |
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if (!in_array(self::DEFAULT_SRC, $this->foundDirectives, true)) { |
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return array_diff(self::EXPECTED_DIRECTIVES, $this->foundDirectives); |
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} |
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return []; |
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} |
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} |
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nicoSWD /
headsec
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