Dunno if this will help you too much, but a quick google search for pam
netware turned up this page:
http://www.kernel.org/pub/linux/libs/pam/modules.html

There are modules that will let you auth agnist your netware boxes, but you
might still have to have a account on the linux machine ( adduser
--disabled-passwd username + set shell to /bin/false ) or set the password
to complete gibberish and change /etc/pam.d/ppp to use the netware modules
and login and everything else use the standard mosules. 

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