We are using WSFederationAuthenticationModule in an ASP.NET MVC 5 application to authenticate users via Windows Azure ACS. We have tried multiple things to save some user specific data in the session after the authentication has succeeded but everytime we write to the session object we got the exception 'Session state is not available in this context'. Our favorite was the event System.IdentityModel.Services.FederatedAuthentication.WSFederationAuthenticationModule.SignedIn but of course at this time the session does not exist. Where is the recommended place to write initial data of an currently authenticated user into the session?
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Have you considered using the ClaimsAuthenticationManager for this? The beauty of this is that you can access the current claims for the authenticated user (before your application code is executed), run whatever query you need to run, and then stuff new claims into the claimset of the principal. I've used this technique before for similar situations as you described.
If you really need to get access to the session data, then I think you want to look at the SessionSecurityTokenHandler class.
