How to set up two-factor authentication (2FA) in Symfony?

To set up two-factor authentication (2FA) in Symfony, you can follow these steps:

Install and configure the Symfony security bundle by running the following command in your terminal:

composer require symfony/security-bundle

Create a new firewall configuration in your Symfony security configuration file (usually located at config/packages/security.yaml). Here is an example configuration for setting up 2FA:

security:
  firewalls:
    dev:
      pattern: ^/(_(profiler|wdt)|css|images|js)/
      security: false
    main:
      pattern: ^/
      user_checker: App\Security\UserChecker
      form_login:
        login_path: app_login
        check_path: app_login
      logout:
        path: app_logout
        target: app_home
      two_factor:
        auth_form_path: app_2fa

Create a new route for the 2FA form in your routes configuration file (usually located at config/routes.yaml). Here is an example route configuration:

app_2fa:
  path: /2fa
  controller: App\Controller\SecurityController::twoFactorAuth

Create a new controller method that handles the 2FA form submission in your Symfony application. Here is an example implementation of the twoFactorAuth method:

namespace App\Controller;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class SecurityController
{
    /**
     * @Route("/2fa", name="app_2fa")
     */
    public function twoFactorAuth(Request $request): Response
    {
        // Handle the 2FA form submission here
    }
}

Implement the logic for sending the 2FA code (e.g., via email, SMS, or a 2FA app) and verifying the 2FA code in your Symfony application.

By following these steps, you can set up two-factor authentication (2FA) in Symfony and enhance the security of your application.