I've writting an httpModule to handle our custom authentication process,
which uses site-wide kerberos.

Currently, this means that each and every page causes authentication to
occur. I'd like to short-circuit authentication if it's already happened by
using something like:

private void AuthenticateRequest(object requestObjectSender, EventArgs
requestObjectEventArguments)
{
if (!Thread.CurrentPrincipal.Identity.IsAuthenticated )
{
HttpApplication objectApplication = (HttpApplication)requestObjectSender;
HttpContext objectContext = (HttpContext)objectApplication.Context;
.....

For this to work, I need to have my GenericPrinciple setup here:

objectContext.User = new GenericPrincipal(objectIdentity, stringRoles);

have its IsAuthenticated property set to true.

How would I do this? The article "Directly Accessing a Principal Object" in
the .NET Framework Developer's Guide doesn't explain this, as far as I can
tell. Are there other pointers?

Thanks,