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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Http\Firewall;
use Psr\Log\LoggerInterface;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\Security\Core\Exception\AccessDeniedException;
use Symfony\Component\Security\Core\Exception\AccountStatusException;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Core\Exception\InsufficientAuthenticationException;
use Symfony\Component\Security\Core\Exception\LogoutException;
use Symfony\Component\Security\Core\Security;
use Symfony\Component\Security\Http\Authorization\AccessDeniedHandlerInterface;
use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
use Symfony\Component\Security\Http\HttpUtils;
use Symfony\Component\Security\Http\Util\TargetPathTrait;
/**
* ExceptionListener catches authentication exception and converts them to
* Response instances.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @final since Symfony 4.3, EventDispatcherInterface type-hints will be updated to the interface from symfony/contracts in 5.0
*/
class ExceptionListener
{
use TargetPathTrait;
private $tokenStorage;
private $providerKey;
private $accessDeniedHandler;
private $authenticationEntryPoint;
private $authenticationTrustResolver;
private $errorPage;
private $logger;
private $httpUtils;
private $stateless;
public function __construct(TokenStorageInterface $tokenStorage, AuthenticationTrustResolverInterface $trustResolver, HttpUtils $httpUtils, string $providerKey, AuthenticationEntryPointInterface $authenticationEntryPoint = null, string $errorPage = null, AccessDeniedHandlerInterface $accessDeniedHandler = null, LoggerInterface $logger = null, bool $stateless = false)
{
$this->tokenStorage = $tokenStorage;
$this->accessDeniedHandler = $accessDeniedHandler;
$this->httpUtils = $httpUtils;
$this->providerKey = $providerKey;
$this->authenticationEntryPoint = $authenticationEntryPoint;
$this->authenticationTrustResolver = $trustResolver;
$this->errorPage = $errorPage;
$this->logger = $logger;
$this->stateless = $stateless;
}
/**
* Registers a onKernelException listener to take care of security exceptions.
*/
public function register(EventDispatcherInterface $dispatcher)
{
$dispatcher->addListener(KernelEvents::EXCEPTION, [$this, 'onKernelException'], 1);
}
/**
* Unregisters the dispatcher.
*/
public function unregister(EventDispatcherInterface $dispatcher)
{
$dispatcher->removeListener(KernelEvents::EXCEPTION, [$this, 'onKernelException']);
}
/**
* Handles security related exceptions.
*/
public function onKernelException(GetResponseForExceptionEvent $event)
{
$exception = $event->getException();
do {
if ($exception instanceof AuthenticationException) {
return $this->handleAuthenticationException($event, $exception);
} elseif ($exception instanceof AccessDeniedException) {
return $this->handleAccessDeniedException($event, $exception);
} elseif ($exception instanceof LogoutException) {
return $this->handleLogoutException($exception);
}
} while (null !== $exception = $exception->getPrevious());
}
private function handleAuthenticationException(GetResponseForExceptionEvent $event, AuthenticationException $exception): void
{
if (null !== $this->logger) {
$this->logger->info('An AuthenticationException was thrown; redirecting to authentication entry point.', ['exception' => $exception]);
}
try {
$event->setResponse($this->startAuthentication($event->getRequest(), $exception));
$event->allowCustomResponseCode();
} catch (\Exception $e) {
$event->setException($e);
}
}
private function handleAccessDeniedException(GetResponseForExceptionEvent $event, AccessDeniedException $exception)
{
$event->setException(new AccessDeniedHttpException($exception->getMessage(), $exception));
$token = $this->tokenStorage->getToken();
if (!$this->authenticationTrustResolver->isFullFledged($token)) {
if (null !== $this->logger) {
$this->logger->debug('Access denied, the user is not fully authenticated; redirecting to authentication entry point.', ['exception' => $exception]);
}
try {
$insufficientAuthenticationException = new InsufficientAuthenticationException('Full authentication is required to access this resource.', 0, $exception);
$insufficientAuthenticationException->setToken($token);
$event->setResponse($this->startAuthentication($event->getRequest(), $insufficientAuthenticationException));
} catch (\Exception $e) {
$event->setException($e);
}
return;
}
if (null !== $this->logger) {
$this->logger->debug('Access denied, the user is neither anonymous, nor remember-me.', ['exception' => $exception]);
}
try {
if (null !== $this->accessDeniedHandler) {
$response = $this->accessDeniedHandler->handle($event->getRequest(), $exception);
if ($response instanceof Response) {
$event->setResponse($response);
}
} elseif (null !== $this->errorPage) {
$subRequest = $this->httpUtils->createRequest($event->getRequest(), $this->errorPage);
$subRequest->attributes->set(Security::ACCESS_DENIED_ERROR, $exception);
$event->setResponse($event->getKernel()->handle($subRequest, HttpKernelInterface::SUB_REQUEST, true));
$event->allowCustomResponseCode();
}
} catch (\Exception $e) {
if (null !== $this->logger) {
$this->logger->error('An exception was thrown when handling an AccessDeniedException.', ['exception' => $e]);
}
$event->setException(new \RuntimeException('Exception thrown when handling an exception.', 0, $e));
}
}
private function handleLogoutException(LogoutException $exception): void
{
if (null !== $this->logger) {
$this->logger->info('A LogoutException was thrown.', ['exception' => $exception]);
}
}
private function startAuthentication(Request $request, AuthenticationException $authException): Response
{
if (null === $this->authenticationEntryPoint) {
throw new HttpException(Response::HTTP_UNAUTHORIZED, $authException->getMessage(), $authException, [], $authException->getCode());
}
if (null !== $this->logger) {
$this->logger->debug('Calling Authentication entry point.');
}
if (!$this->stateless) {
$this->setTargetPath($request);
}
if ($authException instanceof AccountStatusException) {
// remove the security token to prevent infinite redirect loops
$this->tokenStorage->setToken(null);
if (null !== $this->logger) {
$this->logger->info('The security token was removed due to an AccountStatusException.', ['exception' => $authException]);
}
}
$response = $this->authenticationEntryPoint->start($request, $authException);
if (!$response instanceof Response) {
$given = \is_object($response) ? \get_class($response) : \gettype($response);
throw new \LogicException(sprintf('The %s::start() method must return a Response object (%s returned)', \get_class($this->authenticationEntryPoint), $given));
}
return $response;
}
protected function setTargetPath(Request $request)
{
// session isn't required when using HTTP basic authentication mechanism for example
if ($request->hasSession() && $request->isMethodSafe(false) && !$request->isXmlHttpRequest()) {
$this->saveTargetPath($request->getSession(), $this->providerKey, $request->getUri());
}
}
}
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