Self hosted WCF Service Security

I am looking to implement a WCF Service that is self hosted and not hosted in IIS.  From what I can find online, and in books, I can't use the Sql Database Security provider for username and password access control if I host the service outside of IIS.  Can anyone confirm or deny this, and I am really confused at this point for how to implement username/password with roles security for the service if there is now AD domain to authenticate to, and I don't have the ASP.NET/SQL role provider available.

Can any tell me how I could have a self hosted service that can authenticate username/passwords, and apply role security?

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Jonathan Kehayias
http://sqlblog.com/blogs/jonathan_kehayias/
http://www.sqlclr.net/
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