laravel/application/config/auth.php

<?php

return array(

	/*
	|--------------------------------------------------------------------------
	| Retrieve The Current User
	|--------------------------------------------------------------------------
	|
	| This closure is called by the Auth::user() method when attempting to
	| retrieve a user by their ID stored in the session.
	|
	| Simply return an object representing the user with the given ID. Or, if
	| no user with the given ID is registered to use your application, you do
	| not need to return anything.
	|
	| Of course, a simple, elegant authentication solution is already provided
	| for you using Eloquent and the default Laravel hashing engine.
	|
	*/

	'user' => function($id)
	{
		if ( ! is_null($id) and filter_var($id, FILTER_VALIDATE_INT) !== false)
		{
			return User::find($id);
		} 
	},

	/*
	|--------------------------------------------------------------------------
	| Authenticate User Credentials
	|--------------------------------------------------------------------------
	|
	| This closure is called by the Auth::attempt() method when attempting to
	| authenticate a user that is logging into your application.
	|
	| If the provided credentials are correct, simply return an object that
	| represents the user being authenticated. If the credentials are not
	| valid, don't return anything.
	|
	| Note: If a user object is returned, it must have an "id" property.
	|
	*/

	'attempt' => function($username, $password)
	{
		if ( ! is_null($user = User::where('email', '=', $username)->first()))
		{
			if (Hasher::check($password, $user->password)) return $user;
		}
	},

	/*
	|--------------------------------------------------------------------------
	| Logout
	|--------------------------------------------------------------------------
	|
	| Here you may do anything that needs to be done when a user logs out of
	| your application, such as call the logout method on a third-party API
	| you are using for authentication, or anything else you desire.
	|
	*/

	'logout' => function($user) {}

);