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<?php |
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declare(strict_types=1); |
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namespace TheCodingMachine\Middlewares; |
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use Interop\Http\ServerMiddleware\DelegateInterface; |
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use Interop\Http\ServerMiddleware\MiddlewareInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use TheCodingMachine\Middlewares\OriginFetchers\SourceOriginInterface; |
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use TheCodingMachine\Middlewares\OriginFetchers\TargetOriginInterface; |
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use TheCodingMachine\Middlewares\SafeRequests\IsSafeHttpRequestInterface; |
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/** |
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* This class will check that all POST/PUT/DELETE... requests and verify that the "Origin" of the request is your own website. |
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*/ |
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final class CsrfHeaderCheckMiddleware implements MiddlewareInterface |
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{ |
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/** |
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* @var IsSafeHttpRequestInterface |
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*/ |
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private $isSafeHttpRequest; |
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/** |
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* @var TargetOriginInterface |
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*/ |
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private $targetOrigins; |
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/** |
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* @var SourceOriginInterface |
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*/ |
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private $sourceOrigin; |
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const STRICT_COMPARE = true; |
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/** |
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* CsrfHeaderCheckMiddleware constructor. |
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* @param IsSafeHttpRequestInterface $isSafeHttpRequest |
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* @param TargetOriginInterface $targetOrigins |
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* @param SourceOriginInterface $sourceOrigin |
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*/ |
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public function __construct(IsSafeHttpRequestInterface $isSafeHttpRequest, TargetOriginInterface $targetOrigins, SourceOriginInterface $sourceOrigin) |
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{ |
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$this->isSafeHttpRequest = $isSafeHttpRequest; |
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$this->targetOrigins = $targetOrigins; |
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$this->sourceOrigin = $sourceOrigin; |
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} |
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/** |
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* Process an incoming server request and return a response, optionally delegating |
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* to the next middleware component to create the response. |
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* |
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* @param ServerRequestInterface $request |
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* @param DelegateInterface $delegate |
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* @return ResponseInterface |
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* @throws CsrfHeaderCheckMiddlewareException |
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*/ |
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public function process(ServerRequestInterface $request, DelegateInterface $delegate) |
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{ |
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$isSafeHttpRequest = $this->isSafeHttpRequest; |
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if (!$isSafeHttpRequest($request)) { |
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$sourceOrigin = $this->sourceOrigin; |
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$targetOrigins = $this->targetOrigins; |
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$source = $sourceOrigin($request); |
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$targets = $targetOrigins($request); |
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if (!in_array($source, $targets, self::STRICT_COMPARE)) { |
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throw new CsrfHeaderCheckMiddlewareException('Potential CSRF attack stopped. Source origin and target origin do not match.'); |
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} |
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} |
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return $delegate->process($request); |
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} |
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} |
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thecodingmachine /
csrf-header-check-middleware
