AspNetCore.Docs/aspnetcore/security/authorization/simple.md

title	author	description	ms.author	manager	ms.date	ms.topic	ms.technology	ms.prod	uid
Simple Authorization	rick-anderson	This document explains how to use the Authorize attribute to restrict access to ASP.NET Core controllers and actions.	riande	wpickett	10/14/2016	article	aspnet	asp.net-core	security/authorization/simple

Simple Authorization

Authorization in MVC is controlled through the AuthorizeAttribute attribute and its various parameters. At its simplest, applying the AuthorizeAttribute attribute to a controller or action limits access to the controller or action to any authenticated user.

For example, the following code limits access to the AccountController to any authenticated user.

[Authorize]
public class AccountController : Controller
{
    public ActionResult Login()
    {
    }

    public ActionResult Logout()
    {
    }
}

If you want to apply authorization to an action rather than the controller, apply the AuthorizeAttribute attribute to the action itself:

public class AccountController : Controller
{
   public ActionResult Login()
   {
   }

   [Authorize]
   public ActionResult Logout()
   {
   }
}

Now only authenticated users can access the Logout function.

You can also use the AllowAnonymousAttribute attribute to allow access by non-authenticated users to individual actions. For example:

[Authorize]
public class AccountController : Controller
{
    [AllowAnonymous]
    public ActionResult Login()
    {
    }

    public ActionResult Logout()
    {
    }
}

This would allow only authenticated users to the AccountController, except for the Login action, which is accessible by everyone, regardless of their authenticated or unauthenticated / anonymous status.

[!WARNING] [AllowAnonymous] bypasses all authorization statements. If you apply combine [AllowAnonymous] and any [Authorize] attribute then the Authorize attributes will always be ignored. For example if you apply [AllowAnonymous] at the controller level any [Authorize] attributes on the same controller, or on any action within it will be ignored.