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Implementing a custom two-factor authenticator

Getting started

A good starting point are the Google Authenticator and email authentication method, which are shipped with this bundle. Take a look at at the classes located in those namespaces:

  • Scheb\TwoFactorBundle\Security\TwoFactor\Provider\Email
  • Scheb\TwoFactorBundle\Security\TwoFactor\Provider\Google

You will get the basic idea how to implement a custom two-factor method.

The TwoFactorProviderInterface

You have to create a service, which implements the Scheb\TwoFactorBundle\Security\TwoFactor\Provider\TwoFactorProviderInterface interface. It requires these methods:

beginAuthentication

public function beginAuthentication(AuthenticationContextInterface $context): bool

The method is called after successful login. It receives an AuthenticationContextInterface object as the argument (see class Scheb\TwoFactorBundle\Security\TwoFactor\AuthenticationContext) which contains the request object the authentication token, the user entity and other information.

The method has to decide if the user should be asked for two-factor authentication from that provider. In that case return true, otherwise false.

public function prepareAuthentication($user): void;

This method is where you should to the preparation work for your two-factor provider. E.g. the email authenticator is generating a code and sending it to the user.

validateAuthenticationCode

public function validateAuthenticationCode($user, string $authenticationCode): bool

This method is responsible for validating the authentication code entered by the user. Return true if the code was correct or false when it was wrong.

getFormRenderer

public function getFormRenderer(): TwoFactorFormRendererInterface;

This method has to provide a service for rendering the authentication form. Such a service has to implement the Scheb\TwoFactorBundle\Security\TwoFactor\Provider\TwoFactorFormRendererInterface interface:

public function renderForm(Request $request, array $templateVars): Response;

How you render the form is totally up to you. The only important thing is to return a Response, which could also be a RedirectResponse redirect to an external service. A default implementation for rendering forms with Twig is available as Scheb\TwoFactorBundle\Security\TwoFactor\Provider\DefaultTwoFactorFormRenderer.

Register the provider

Now you have to register your two-factor provider as a service. A tag named scheb_two_factor.provider will make your provider available to the bundle.

The attribute alias has to be a unique identifier for the authentication provider.

<service id="acme.two_factor.provider" class="%acme.two_factor.provider.class%">
	<tag name="scheb_two_factor.provider" alias="acme_two_factor" />
</service>

Please note: The aliases google and email are already taken by the authentication methods shipped with this bundle.