How can disable keyboard/unused ports?

[Rick Meyer]

How do I lock or disable unused ports such as keyboard, video and USB ports?
 
Here is the scenario; I have several firewalls built upon Fedora that are in
closets physically unmonitored.  An unscrupulous individual could plug in a
keyboard, mouse and monitor into one of these systems and start getting
access to it.  Even worse the individual could plug in other devices to log
all packets flowing through the firewall.   This gives me chills just
thinking about it!
 
I would like to disable any I/O devices that aren't actually needed.  
 
(Also I would like to insure that the system only boots from the configured
hard drive that the system was originally load with.  But this might turn
into another thread.)
 
So how can I protect a system from a local attack such as above?
 
 
Thanks 
Rick
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