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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\Core\Http\Security; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use TYPO3\CMS\Core\Http\HtmlResponse; |
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use TYPO3\CMS\Core\Http\NormalizedParams; |
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use TYPO3\CMS\Core\Utility\GeneralUtility; |
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use TYPO3\CMS\Core\Utility\PathUtility; |
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/** |
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* @internal |
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*/ |
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class ReferrerEnforcer |
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{ |
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private const TYPE_REFERRER_EMPTY = 1; |
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private const TYPE_REFERRER_SAME_SITE = 2; |
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private const TYPE_REFERRER_SAME_ORIGIN = 4; |
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/** |
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* @var ServerRequestInterface |
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*/ |
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protected $request; |
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/** |
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* @var string |
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*/ |
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protected $requestHost; |
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/** |
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* @var string |
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*/ |
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protected $requestDir; |
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public function __construct(ServerRequestInterface $request) |
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{ |
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$this->request = $request; |
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$this->requestHost = rtrim($this->resolveRequestHost($request), '/') . '/'; |
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$this->requestDir = $this->resolveRequestDir($request); |
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} |
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public function handle(array $options = null): ?ResponseInterface |
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{ |
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$referrerType = $this->resolveReferrerType(); |
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// valid referrer, no more actions required |
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if ($referrerType & self::TYPE_REFERRER_SAME_ORIGIN) { |
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return null; |
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} |
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$flags = $options['flags'] ?? []; |
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$expiration = $options['expiration'] ?? 5; |
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// referrer is missing and route requested to refresh |
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// (created HTML refresh to enforce having referrer) |
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if (($this->request->getQueryParams()['referrer-refresh'] ?? 0) <= time() |
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&& ( |
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in_array('refresh-always', $flags, true) |
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|| ($referrerType & self::TYPE_REFERRER_EMPTY && in_array('refresh-empty', $flags, true)) |
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|| ($referrerType & self::TYPE_REFERRER_SAME_SITE && in_array('refresh-same-site', $flags, true)) |
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) |
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) { |
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$refreshParameter = 'referrer-refresh=' . (time() + $expiration); |
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$refreshUri = $this->request->getUri(); |
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$query = $refreshUri->getQuery(); |
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$refreshUri = $refreshUri->withQuery( |
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$query !== '' ? $query . '&' . $refreshParameter : $refreshParameter |
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); |
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$scriptUri = $this->resolveAbsoluteWebPath( |
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'EXT:core/Resources/Public/JavaScript/ReferrerRefresh.js' |
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); |
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// simulating navigate event by clicking anchor link |
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// since meta-refresh won't change `document.referrer` in e.g. Firefox |
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return new HtmlResponse(sprintf( |
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'<html>' |
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. '<head><link rel="icon" href="data:image/svg+xml,"></head>' |
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. '<body><a href="%1$s" id="referrer-refresh"> </a>' |
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. '<script src="%2$s"></script></body>' |
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. '</html>', |
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htmlspecialchars((string)$refreshUri), |
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htmlspecialchars($scriptUri) |
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)); |
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} |
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$subject = $options['subject'] ?? ''; |
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if ($referrerType & self::TYPE_REFERRER_EMPTY) { |
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// still empty referrer or invalid referrer, deny route invocation |
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throw new MissingReferrerException( |
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sprintf('Missing referrer%s', $subject !== '' ? ' for ' . $subject : ''), |
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1588095935 |
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); |
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} |
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// referrer is given, but does not match current base URL |
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throw new InvalidReferrerException( |
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sprintf('Invalid referrer%s', $subject !== '' ? ' for ' . $subject : ''), |
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1588095936 |
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); |
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} |
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protected function resolveAbsoluteWebPath(string $target): string |
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{ |
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return PathUtility::getAbsoluteWebPath( |
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GeneralUtility::getFileAbsFileName($target) |
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); |
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} |
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protected function resolveReferrerType(): int |
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{ |
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$referrer = $this->request->getServerParams()['HTTP_REFERER'] ?? ''; |
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if ($referrer === '') { |
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return self::TYPE_REFERRER_EMPTY; |
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} |
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if (strpos($referrer, $this->requestDir) === 0) { |
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// same-origin implies same-site |
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return self::TYPE_REFERRER_SAME_ORIGIN | self::TYPE_REFERRER_SAME_SITE; |
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} |
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if (strpos($referrer, $this->requestHost) === 0) { |
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return self::TYPE_REFERRER_SAME_SITE; |
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} |
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return 0; |
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} |
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protected function resolveRequestHost(ServerRequestInterface $request): string |
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{ |
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$normalizedParams = $request->getAttribute('normalizedParams'); |
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if ($normalizedParams instanceof NormalizedParams) { |
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return $normalizedParams->getRequestHost(); |
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} |
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return GeneralUtility::getIndpEnv('TYPO3_REQUEST_HOST'); |
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} |
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protected function resolveRequestDir(ServerRequestInterface $request): string |
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{ |
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$normalizedParams = $request->getAttribute('normalizedParams'); |
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if ($normalizedParams instanceof NormalizedParams) { |
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return $normalizedParams->getRequestDir(); |
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} |
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return GeneralUtility::getIndpEnv('TYPO3_REQUEST_DIR'); |
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} |
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} |
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TYPO3 /
TYPO3.CMS
