The Mixed Authentication Disposition ASP.NET Module (MADAM) is exactly what I need for the project I’m building in MVC2. I’m not an expert on authentication, could MADAM be quickly retrofitted to work with the MVC pipeline?
http://msdn.microsoft.com/en-us/library/aa479391.aspx

Depending on your Server Version of IIS, you will need to place the MADAM modules into different locations within your web.config file.
IIS 6
IIS 7