IPhone Facebook Connect then Login to ASP.NET MVC Server

I have Facebook Connect Implemented on the IPhone I have a ASP.NET MVC "API" site that I want the IPhone client to connect and login to. This enable me to then connect the facebook user to the internal asp.net memberbership provider.

How would I connect the two end points?

I am not sure a secure way to authenticate the user after they have successfully logged in via the IPhone. The parameters that usually provided by the Facebook Cookie like sig_request..etc... is not available on the IPhone.

Similar to which was never answered: iPhone app u开发者_开发技巧sing facebook connect login to authenticate with web server possible?