CAS SSO with Silex guard authfailure handler - php

Question

I have implemented jasig/phpCas authentication in My Silex App.
It is almost done, but I can't Handle authfailure Response correclty.
$app['app.token_authenticator'] = function ($app) {
return new MyApp\Domain\MyTokenAuthenticator($app['security.encoder_factory'],$app['cas'],$app['dao.usersso']);
};
$app['security.firewalls'] = array(
'default' => array(
'pattern' => '^/.*$',
'anonymous' => true,
'guard' => array(
'authenticators' => array(
'app.token_authenticator'
),
),
'logout' => array ( 'logout_path' => '/logout', 'target_url' => '/goodbye' ),
'form' => array('login_path' =>'/login', 'check_path' =>'/admin/login_check', 'authenticator' => 'time_authenticator' ),
'users' => function () use ($app) {
return new MyApp\DAO\UserDAO($app['db']);
},
),
);
MyTokenAuthenticator class :
class MyTokenAuthenticator extends AbstractGuardAuthenticator
{
private $encoderFactory;
private $cas_settings;
private $sso_dao;
public function __construct(EncoderFactoryInterface $encoderFactory, $cas_settings, MyApp\DAO\UserSsoDAO $userdao)
{
$this->encoderFactory = $encoderFactory;
$this->cas_settings = $cas_settings;
$this->sso_dao = $userdao;
}
public function getCredentials(Request $request)
{
$bSSO = false;
//Test request for sso
if ( strpos($request->get("ticket"),"cas-intra") !==false )
$bSSO = true;
if($request->get("sso") == "1")
$bSSO=true;
if ($bSSO)
{
if ($this->cas_settings['debug'])
{
\CAS_phpCAS::setDebug();
\CAS_phpCAS::setVerbose(true);
}
\CAS_phpCAS::client(CAS_VERSION_2_0,
$this->cas_settings['server'],
$this->cas_settings['port'],
$this->cas_settings['context'],
false);
\CAS_phpCAS::setCasServerCACert('../app/config/cas.pem');
// force CAS authentication
\CAS_phpCAS::forceAuthentication();
$username = \CAS_phpCAS::getUser();
return array (
'username' => $username,
'secret' => 'SSO'
);
}
//Nothing to do, skip custom auth
return;
}
/**
* Get User from the SSO database.
* Add it into the MyApp users database (Update if already exists)
* {#inheritDoc}
* #see \Symfony\Component\Security\Guard\GuardAuthenticatorInterface::getUser()
*/
public function getUser($credentials, UserProviderInterface $userProvider)
{
//Get user stuf
....
//return $userProvider->loadUserByUsername($credentials['username']);
return $user;
}
/**
*
* {#inheritDoc}
* #see \Symfony\Component\Security\Guard\GuardAuthenticatorInterface::checkCredentials()
*/
public function checkCredentials($credentials, UserInterface $user)
{
// check credentials - e.g. make sure the password is valid
// return true to cause authentication success
if ( $this->sso_dao->isBAllowed($user->getLogin() ) )
return true;
else
throw new CustomUserMessageAuthenticationException("Sorry, you're not alllowed tu use this app.");
}
public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey)
{
// on success, let the request continue
return;
}
public function onAuthenticationFailure(Request $request, AuthenticationException $exception)
{
$data = array(
'message' => strtr($exception->getMessageKey(), $exception->getMessageData()),
// or to translate this message
// $this->translator->trans($exception->getMessageKey(), $exception->getMessageData())
);
return new JsonResponse($data,403);
}
Issue is when a valid user from SSO is denied in app. It displays
a page with json Message, without any rendering.
My workaround is to use minimal html page with sso logout link as response and session_destroy(), but its quick and dirty fix.
I'd like a redenring via twig with a nice error message. Maybe some other class to extend ? Silex's Documentation was no help. Thank you !

Answer 1

Back to this question as I was on others apsects of the dev.
#mTorres solution is working. I had to store whole app object via constructor as twig is not set at this time in service registry.
class MyTokenAuthenticator extends AbstractGuardAuthenticator
{
private $app;
public function __construct($app)
{
$this->app=$app;
}
then custom event
public function onAuthenticationFailure(Request $request, AuthenticationException $exception)
{
return new \Symfony\Component\HttpFoundation\Response(
$this->app['twig']->render( 'logout.html.twig',array(
'error' => $data,
));
}
Many thanks !