You should take a look at winbind.  I have managed to get a Linux box to 
log into my domain (granted its a Samba domain, but I don't think it 
matters, it should work if its NT).  Check the winbind manpage or google it.

There is also a samba option called credentials .. .check the smbclient 
manpage.

There was a thread a little while ago on this list that might be useful 
... here is the link from that thread (about using credentials)

http://www.justlinux.com/nhf/Filesystems/Mounting_smbfs_Shares_Permanently.html

Austin

Kurt Granroth wrote:
> Does anybody know of a case-study or HOWTO on fully integrating a Linux 
> workstation into an existing Windows NT domain?
> 
> I've got CUPS using the network printer using smb://username:password@DOMAIN 
> and mounting shares back and forth works great... but there are a couple of 
> problems doing things like that:
> 
> 1. CUPS requires you to setup the printer to use an individual's domain 
> credentials.  If there are multiple users on the machine, that one person's 
> credentials are using used.  Not to mention that the username and password 
> are freely viewable using 'ps' while printing.
> 
> 2. Login user names and passwords are different between the Linux and Windows 
> boxes.  Yes, you can manually keep them in sync... but it's a pain.
> 
> What I would like to do is make the Windows domain think that my Linux box is 
> just another host in its domain.  That means several things:
> 
> 1. Login using the NT domain server as the authenticator.  Mounting shares 
> will no longer need a password since it's already supplied.
> 2. A Linux user will be able to print to a network printer in the domain using 
> their own credentials (but hopefully not have to supply them again since they 
> are already logged in).
> 
> Is this even possible?  If so, were can I find docs on how this is done?