chain_provider

security:

    providers:
        chain_provider:
            chain:
                providers: [db_username, db_email]
        db_username:
            entity:
                class: MyUserBundle:User
                property: username
        db_email:
            entity:
                class: MyUserBundle:User
                property: email

    firewalls:

        default:
            anonymous: ~
            provider: chain_provider
            form_login:
                login_path: /login
                check_path: /login