Programming with Privileges

For this assignment, modify the programs for the last assignment
to use the actual user and group ID.  That is, instead of having
-u and -g, see what permissions the programs are actually running
with.

The catch: you MUST prevent any access to the repository that bypasses
the ACLs.  This implies that the repository must be protected using
OS permissions, which in turn means that a separate UID is needed.
The programs must either be setUID or use message-passing; that's your choice.

The objects for user and group names are no longer needed; use the system's
equivalents.

One important design decision: what UID are you using, root or some
non-privileged one?  Your README file MUST justify your choice.  A
correct choice with an incorrect justification will lose points.  (Of
course, an incorrect choice will also lose points.)

You should run this assignment using a VMware virtual machine; see
the instructions on the web page.

If you choose to use message-passing, you need not solve the start-up
problem; it is acceptable to start the daemon manually.

You must supply a script that will create an empty repository, including
setting all permissions you rely on for correct, secure behavior.  The
README file should explain the rationale for whatever permissions you
choose.