I'm calling a WCF service from an ASP.NET application. From this, I am accessing a WCF service using WSHTTPBinding. I can get the current user from HttpContext.Current.User.Identity.Name. I want to be able to pass this to WCF (not using a custome header - surely there is a proper way to do this.) It must be the identity in HttpContext.Current.User.Identity.Name and not WindowsIdentity.GetCurrent().Name, as this service may be consumed from ASP.nET applications that use Forms or Windows authentication. From what I understand, it should appear in ServiceSecurityContext.Current.PrimaryIdentity.Name. I have search for ages to try to find the answer to this but have not yet found it.
Have a look at Username Authentication :) http://codebetter.com/petervanooijen/2010/03/22/a-simple-wcf-service-with-username-password-authentication-the-things-they-don-t-tell-you/