title: ASP.NET MVC Identity with existing user table
body: <p>I am creating a new web application that needs to authenticate users against an existing user table that exists from another web application. User registration, forgotten password, etc are handled in that application. All I need in my new application is login. </p>
  
  <p>I wondered if it was possible to overwrite some Identity class to point to that table to authenticate the user so I can use the existing Identity functionality like the [Authorize] attribute on Controllers and to redirect back to the login page, etc. </p>