Remember me function for custom user login in Sulu CMS

I created a website with a user login using Sulu CMF. For the user login, I would like to create a "remember me" checkbox. According to Symfony docs, all that need to be done is

• adjust firewall settings in security.yaml
• add a checkbox to the form, with name="_remember_me"
• add Remember Me Support to the Authenticator

Symfony docs link

The first two points are straight forward. For the third point, "add Remember Me Support to the Authenticator" I am a bit lost, as with sulu I am not using a custom authenticator, but Sulu rather provides the authentication mechanism, with Sulu users and roles an all that.

How can I tell the Sulu authenticator to add the RememberMeBadge to the authentication Passport as described in the docs?

Update: When loggin in, the server responds with the REMEMBERME cookie, but with the value "deleted".

Finally I got it working by creating a custom Authenticator. The reason why it did not work in the first place is due to the symfony FormLoginAuthenticator that creates the RememberMeBadge, but does not enable it. See https://github.com/symfony/security-http/blob/7.0/Authenticator/FormLoginAuthenticator.php

Here you see that the RememberMeBadge is disabled by default: https://github.com/symfony/security-http/blob/7.0/Authenticator/Passport/Badge/RememberMeBadge.php

That fact that the badge is created but not enabled, does not make sense to me, maybe this is a bug in the Symfony framework.

However, a custom Authenticator that creates and enables the badge, solved the issue for me.

<?php

namespace App\Security;

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Http\Authenticator\AbstractLoginFormAuthenticator;
use Symfony\Component\Security\Http\Authenticator\Passport\Badge\CsrfTokenBadge;
use Symfony\Component\Security\Http\Authenticator\Passport\Badge\RememberMeBadge;
use Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge;
use Symfony\Component\Security\Http\Authenticator\Passport\Credentials\PasswordCredentials;
use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
use Symfony\Component\Security\Http\SecurityRequestAttributes;
use Symfony\Component\Security\Http\Util\TargetPathTrait;

class CustomAuthenticator extends AbstractLoginFormAuthenticator
{
    use TargetPathTrait;

    public const LOGIN_ROUTE = 'app_login';

    public function __construct(private UrlGeneratorInterface $urlGenerator)
    {
    }

    public function authenticate(Request $request): Passport
    {
        $username = $request->request->get('_username', '');

        $request->getSession()->set(SecurityRequestAttributes::LAST_USERNAME, $username);

        return new Passport(
            new UserBadge($username),
            new PasswordCredentials($request->request->get('_password', '')),
            [
                new CsrfTokenBadge('authenticate', $request->request->get('_csrf_token')),
                (new RememberMeBadge())->enable(),
            ]
        );
    }

    public function onAuthenticationSuccess(Request $request, TokenInterface $token, string $firewallName): ?Response
    {
        if ($targetPath = $this->getTargetPath($request->getSession(), $firewallName)) {
            return new RedirectResponse($targetPath);
        }

        // redirect to homepage
        return new RedirectResponse('/');
    }

    protected function getLoginUrl(Request $request): string
    {
        return $this->urlGenerator->generate(self::LOGIN_ROUTE);
    }
}

The authenticator was created using the symfony cli command php bin/console make:auth with some minor adjustments.