InfoPath Dev

I need to know how to retrieve data from an Active Directory service or smart card.  All I know how to do is retrieve the username when the user opens the form.  Then I store the username into a field and manipulate it.  But I want to know how to retrieve their name, username, office, building, email, and phone number.  A plus would to be able to retrieve their digital signature.  I don't have any idea where to look.

You can use GetUserProfileByName web service data connection to get  user details.

this may help

http://blog.mangroveweb.com/pre-populating-an-infopath-from-with-mysql-data-using-a-net-web-service/using-sharepoints-getuserprofilebyname-web-service-to-retrieve-ad-account-information/