Chris@17: <?php
Chris@17: 
Chris@17: /*
Chris@17:  * This file is part of the Symfony package.
Chris@17:  *
Chris@17:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@17:  *
Chris@17:  * For the full copyright and license information, please view the LICENSE
Chris@17:  * file that was distributed with this source code.
Chris@17:  */
Chris@17: 
Chris@17: namespace Symfony\Component\HttpKernel\HttpCache;
Chris@17: 
Chris@17: use Symfony\Component\HttpFoundation\IpUtils;
Chris@17: use Symfony\Component\HttpFoundation\Request;
Chris@17: use Symfony\Component\HttpFoundation\Response;
Chris@17: use Symfony\Component\HttpKernel\HttpKernelInterface;
Chris@17: 
Chris@17: /**
Chris@17:  * @author Nicolas Grekas <p@tchwork.com>
Chris@17:  *
Chris@17:  * @internal
Chris@17:  */
Chris@17: class SubRequestHandler
Chris@17: {
Chris@17:     /**
Chris@17:      * @return Response
Chris@17:      */
Chris@17:     public static function handle(HttpKernelInterface $kernel, Request $request, $type, $catch)
Chris@17:     {
Chris@17:         // save global state related to trusted headers and proxies
Chris@17:         $trustedProxies = Request::getTrustedProxies();
Chris@17:         $trustedHeaderSet = Request::getTrustedHeaderSet();
Chris@17:         if (\method_exists(Request::class, 'getTrustedHeaderName')) {
Chris@17:             Request::setTrustedProxies($trustedProxies, -1);
Chris@17:             $trustedHeaders = [
Chris@17:                 Request::HEADER_FORWARDED => Request::getTrustedHeaderName(Request::HEADER_FORWARDED, false),
Chris@17:                 Request::HEADER_X_FORWARDED_FOR => Request::getTrustedHeaderName(Request::HEADER_X_FORWARDED_FOR, false),
Chris@17:                 Request::HEADER_X_FORWARDED_HOST => Request::getTrustedHeaderName(Request::HEADER_X_FORWARDED_HOST, false),
Chris@17:                 Request::HEADER_X_FORWARDED_PROTO => Request::getTrustedHeaderName(Request::HEADER_X_FORWARDED_PROTO, false),
Chris@17:                 Request::HEADER_X_FORWARDED_PORT => Request::getTrustedHeaderName(Request::HEADER_X_FORWARDED_PORT, false),
Chris@17:             ];
Chris@17:             Request::setTrustedProxies($trustedProxies, $trustedHeaderSet);
Chris@17:         } else {
Chris@17:             $trustedHeaders = [
Chris@17:                 Request::HEADER_FORWARDED => 'FORWARDED',
Chris@17:                 Request::HEADER_X_FORWARDED_FOR => 'X_FORWARDED_FOR',
Chris@17:                 Request::HEADER_X_FORWARDED_HOST => 'X_FORWARDED_HOST',
Chris@17:                 Request::HEADER_X_FORWARDED_PROTO => 'X_FORWARDED_PROTO',
Chris@17:                 Request::HEADER_X_FORWARDED_PORT => 'X_FORWARDED_PORT',
Chris@17:             ];
Chris@17:         }
Chris@17: 
Chris@17:         // remove untrusted values
Chris@17:         $remoteAddr = $request->server->get('REMOTE_ADDR');
Chris@17:         if (!IpUtils::checkIp($remoteAddr, $trustedProxies)) {
Chris@17:             foreach ($trustedHeaders as $key => $name) {
Chris@17:                 if ($trustedHeaderSet & $key) {
Chris@17:                     $request->headers->remove($name);
Chris@17:                     $request->server->remove('HTTP_'.strtoupper(str_replace('-', '_', $name)));
Chris@17:                 }
Chris@17:             }
Chris@17:         }
Chris@17: 
Chris@17:         // compute trusted values, taking any trusted proxies into account
Chris@17:         $trustedIps = [];
Chris@17:         $trustedValues = [];
Chris@17:         foreach (array_reverse($request->getClientIps()) as $ip) {
Chris@17:             $trustedIps[] = $ip;
Chris@17:             $trustedValues[] = sprintf('for="%s"', $ip);
Chris@17:         }
Chris@17:         if ($ip !== $remoteAddr) {
Chris@17:             $trustedIps[] = $remoteAddr;
Chris@17:             $trustedValues[] = sprintf('for="%s"', $remoteAddr);
Chris@17:         }
Chris@17: 
Chris@17:         // set trusted values, reusing as much as possible the global trusted settings
Chris@17:         if (Request::HEADER_FORWARDED & $trustedHeaderSet) {
Chris@17:             $trustedValues[0] .= sprintf(';host="%s";proto=%s', $request->getHttpHost(), $request->getScheme());
Chris@17:             $request->headers->set($name = $trustedHeaders[Request::HEADER_FORWARDED], $v = implode(', ', $trustedValues));
Chris@17:             $request->server->set('HTTP_'.strtoupper(str_replace('-', '_', $name)), $v);
Chris@17:         }
Chris@17:         if (Request::HEADER_X_FORWARDED_FOR & $trustedHeaderSet) {
Chris@17:             $request->headers->set($name = $trustedHeaders[Request::HEADER_X_FORWARDED_FOR], $v = implode(', ', $trustedIps));
Chris@17:             $request->server->set('HTTP_'.strtoupper(str_replace('-', '_', $name)), $v);
Chris@17:         } elseif (!(Request::HEADER_FORWARDED & $trustedHeaderSet)) {
Chris@17:             Request::setTrustedProxies($trustedProxies, $trustedHeaderSet | Request::HEADER_X_FORWARDED_FOR);
Chris@17:             $request->headers->set($name = $trustedHeaders[Request::HEADER_X_FORWARDED_FOR], $v = implode(', ', $trustedIps));
Chris@17:             $request->server->set('HTTP_'.strtoupper(str_replace('-', '_', $name)), $v);
Chris@17:         }
Chris@17: 
Chris@17:         // fix the client IP address by setting it to 127.0.0.1,
Chris@17:         // which is the core responsibility of this method
Chris@17:         $request->server->set('REMOTE_ADDR', '127.0.0.1');
Chris@17: 
Chris@17:         // ensure 127.0.0.1 is set as trusted proxy
Chris@17:         if (!IpUtils::checkIp('127.0.0.1', $trustedProxies)) {
Chris@17:             Request::setTrustedProxies(array_merge($trustedProxies, ['127.0.0.1']), Request::getTrustedHeaderSet());
Chris@17:         }
Chris@17: 
Chris@17:         try {
Chris@17:             return $kernel->handle($request, $type, $catch);
Chris@17:         } finally {
Chris@17:             // restore global state
Chris@17:             Request::setTrustedProxies($trustedProxies, $trustedHeaderSet);
Chris@17:         }
Chris@17:     }
Chris@17: }