[Samba] "primary domain controller"+"internet access"

[kdmprasad at netindial.com]

Hello,
Iam just planning to go with samba as a primary domain 
controller.And i just had an idea whether the LAN users once 
authenticated in PDC has an access to the file and print 
services.Can i use the same PDC and untill a user is authorized 
there is no internet access given.Did anyone have the same idea or 
worked before at anytime.Please guide me .
thanks in advance
prasad.