Claims-based security in Silverlight 4

We are implementing a claims-based approach to security for our enterprise applications. I've b开发者_JAVA百科een looking at the built-in support (with System.IdentityModel) as well as Windows Identity Foundation (WIF) but it doesn't look like either support Silverlight applications. I realize that SL4 doesn't support IPrincipal et al, but that shouldn't mean we can't still do claims-based auth.

Am I missing samples or documentation showing how to do so in SL4 or am I left to a home-grown solution?

I recently discovered that the latest version of the WIF Training Kit contains a sample application showing how to integrate WIF into a Silverlight client. It includes a version of the WIF IdentityModel code compiled against the Silverlight runtime. While not an ideal or even long-term solution, it gets me going.

Have a look at this by Dominic: http://www.leastprivilege.com/UsingSilverlightToAccessWIFSecuredWCFServices.aspx

or this: http://social.msdn.microsoft.com/Forums/en/Geneva/thread/fe890df3-8815-4d05-b293-d3c87f32e9e0