How to get user token in Wrap Credential Provider?

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Windows

Win7

I'm developing credential provider, that would authentificate user by
login, password and identification media(such as flash, cd,dvd,
floppy). Exactly, i'm porting these from my gina realization.
Code, that check media is complete, and my problem is to obtain
current user token in wrap provider that wrap standart password
provider. My first idea was to use LogonUser in GetSerialization method, but i can't get username, password and domain from wrapped custom password provider.