[Security/Http] better error message when session times out, or cookies are disabled

src/Symfony/Component/Security/Core/Exception/SessionUnavailableException.php

@@ -0,0 +1,27 @@
+<?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\Core\Exception;
+
+/**
+ * This exception is thrown when no session is available.
+ *
+ * Possible reasons for this are:
+ *
+ *     a) The session timed-out because the user waited too long.
+ *     b) The user has disabled cookies, and a new session is started on each
+ *        request.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class SessionUnavailableException extends AuthenticationException
+{
+}

src/Symfony/Component/Security/Http/Firewall/AbstractAuthenticationListener.php

@@ -18,6 +18,7 @@ use Symfony\Component\Security\Http\RememberMe\RememberMeServicesInterface;
 use Symfony\Component\Security\Core\SecurityContextInterface;
 use Symfony\Component\Security\Core\Authentication\AuthenticationManagerInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
+use Symfony\Component\Security\Core\Exception\SessionUnavailableException;
 use Symfony\Component\HttpKernel\Log\LoggerInterface;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Events as KernelEvents;
@@ -123,6 +124,14 @@ abstract class AbstractAuthenticationListener implements ListenerInterface
                 return;
             }
 
+            if (!$request->hasSession()) {
+                throw new \RuntimeException('This authentication method requires a session.');
+            }
+
+            if (!$request->hasPreviousSession()) {
+                throw new SessionUnavailableException('Your session has timed-out, or you have disabled cookies.');
+            }
+
             if ($returnValue instanceof TokenInterface) {
                 $this->sessionStrategy->onAuthentication($request, $returnValue);