AuthManager.php

<?php namespace Backend\Auth;

use Illuminate\Auth\AuthManager as BaseAuthManager;
use Illuminate\Auth\EloquentUserProvider;

class AuthManager extends BaseAuthManager
{

    /**
     * Create an instance of the Eloquent driver.
     *
     * @return \Illuminate\Auth\Guard
     */
    public function createEloquentDriver()
    {
        $provider = $this->createEloquentProvider();

        return new Guard($provider, $this->app['session.store']);
    }

    /**
     * Create an instance of the Eloquent user provider.
     *
     * @return \Illuminate\Auth\EloquentUserProvider
     */
    protected function createEloquentProvider()
    {
        $model = $this->app['config']->get('auth.model');

        return new EloquentUserProvider($this->app['hash'], $model);
    }

    /**
     * Get the default authentication driver name.
     *
     * @return string
     */
    public function getDefaultDriver()
    {
        return 'eloquent';
    }

}

AuthServiceProvider.php

<?php namespace Backend\Auth;

use Illuminate\Support\ServiceProvider;

class AuthServiceProvider extends ServiceProvider
{

    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = true;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bindShared('backend.auth', function ($app)
        {
            return new AuthManager($app);
        });
    }

    /**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return ['backend.auth'];
    }

}

Facades\Auth.php

<?php namespace Backend\Auth\Facades;

use Illuminate\Support\Facades\Facade;

/**
 * @see \Illuminate\Auth\AuthManager
 * @see \Illuminate\Auth\Guard
 */
class Auth extends Facade
{

    /**
     * Get the registered name of the component.
     *
     * @return string
     */
    protected static function getFacadeAccessor()
    {
        return 'backend.auth';
    }

Guard.php

<?php namespace Backend\Auth;

class Guard extends \Illuminate\Auth\Guard
{
}