Remote hardware authentication

[Garrett Kajmowicz]

I have no experience with PAM development, but I'd be willing to commit some 
time to learning if the following seems reasonably possible:

How difficult would it be to implement a pass-through authentication scheme 
which would allow for existing hardware PAM modules to have the hardware 
access executed on the remote machine?  That is, instead of reading a local 
USB device, a remote USB device would be read, for those people who are 
logging in via SSH, X11, etc from a remote system.

Other ideas/whack over the head appreciated.

- Garrett Kajmowicz