title: Custom Authentication Provider for ASP.NET and MVC3
body: <p>I am looking for information on how to build out a custom authentication provider. I have to interface with a rather odd authentication/authorization scheme and it would be nice if it just “plugged” into asp.net.  Any links would be helpful.</p>
  
  <p>I figured out how to write a custom Authorize attribute, but how to get the authentication part in?</p>