Best Approch for Generic Authentication Framework

Question

Hi

We have got multiple application that uses different way of authetication to authenticate user. Almost all application are developed in WPF but there are few application which are developed in ASP.NET and Silverlight.

Our ultimate goal is that every application that we had developed already and those we develop in future will use a common authetication famework to authenticate user and this framework will return the status of the authentication

What would be the best approch for this? Is it feasible to developed such system? Has anyone did it past?

Any suggestion/question/critics are welcome.

Thanks