126 lines
4.5 KiB
PHP
126 lines
4.5 KiB
PHP
<?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\Backend\Middleware;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\ServerRequestInterface;
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use Psr\Http\Server\MiddlewareInterface;
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use Psr\Http\Server\RequestHandlerInterface;
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use TYPO3\CMS\Backend\Authentication\BackendLocker;
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use TYPO3\CMS\Backend\Exception\BackendAccessDeniedException;
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use TYPO3\CMS\Backend\Exception\BackendLockedException;
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use TYPO3\CMS\Core\Http\JsonResponse;
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use TYPO3\CMS\Core\Http\RedirectResponse;
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use TYPO3\CMS\Core\Utility\GeneralUtility;
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use TYPO3\CMS\Core\Utility\HttpUtility;
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/**
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* Checks various security options for accessing the TYPO3 backend before proceeding
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*
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* Depends on the NormalizedParams middleware to identify the
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* Site URL and if the page is not running via HTTPS yet.
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*
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* @internal
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*/
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readonly class LockedBackendGuard implements MiddlewareInterface
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{
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public function __construct(
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protected BackendLocker $lockService
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) {}
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/**
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* Checks the client's IP address and the availability of LOCK_BACKEND file,
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* location may vary, @see BackendLocker->isLocked().
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*/
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
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{
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try {
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$redirectToUri = $this->checkLockedBackend();
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if (!empty($redirectToUri)) {
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return new RedirectResponse($redirectToUri, 302);
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}
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} catch (BackendLockedException $e) {
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// Looks like an AJAX request that can handle JSON, (usually from the timeout functionality)
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// So, let's form a request that fits
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if (str_contains($request->getHeaderLine('Accept'), 'application/json')) {
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$session = [
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'timed_out' => false,
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'will_time_out' => false,
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'locked' => true,
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'message' => $e->getMessage(),
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];
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return new JsonResponse(['login' => $session]);
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}
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throw $e;
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}
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$this->validateVisitorsIpAgainstIpMaskList(
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$request->getAttribute('normalizedParams')->getRemoteAddress(),
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trim((string)$GLOBALS['TYPO3_CONF_VARS']['BE']['IPmaskList'])
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);
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return $handler->handle($request);
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}
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/**
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* Check adminOnly configuration variable and redirects to an URL in file
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* LOCK_BACKEND. Location may vary, @see BackendLocker->isLocked().
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*
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* @throws BackendLockedException
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*/
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protected function checkLockedBackend(): ?string
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{
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if ($GLOBALS['TYPO3_CONF_VARS']['BE']['adminOnly'] < 0) {
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throw new BackendLockedException(
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HttpUtility::HTTP_STATUS_403,
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'Backend is locked for maintenance. [BE][adminOnly] is set to "' . (int)$GLOBALS['TYPO3_CONF_VARS']['BE']['adminOnly'] . '".',
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'TYPO3 Backend locked',
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1517949794
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);
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}
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if ($this->lockService->isLocked()) {
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$redirectUri = $this->lockService->getRedirectUriFromLockContents();
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if ($redirectUri) {
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return $redirectUri;
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}
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throw new BackendLockedException(
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HttpUtility::HTTP_STATUS_403,
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'Backend access by browser is locked for maintenance. Remove lock by removing the file "LOCK_BACKEND" as configured in TYPO3_CONF_VARS[BE][lockBackendFile]. Or (better) use CLI-script "bin/typo3 backend:unlock".',
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'TYPO3 Backend locked',
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1517949793
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);
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}
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return null;
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}
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/**
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* Compare client IP with IPmaskList and throw an exception
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*/
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protected function validateVisitorsIpAgainstIpMaskList(string $ipAddress, string $ipMaskList = ''): void
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{
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if ($ipMaskList !== '' && !GeneralUtility::cmpIP($ipAddress, $ipMaskList)) {
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throw new BackendAccessDeniedException(
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HttpUtility::HTTP_STATUS_403,
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'The IP address of your client does not match the list of allowed IP addresses.',
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'TYPO3 Backend access denied',
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1517949792
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);
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}
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}
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}
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