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SubjectRe: One process with multiple user ids.
Giuliano Gagliardi wrote:
> Hello,
>
> I have a server that has to switch to different user ids, but because it does
> other complex things, I would rather not have it run as root. I only need the
> server to be able to switch to certain pre-defined user ids.
>
> I have seen that two possible solutions have already been suggested here on
> the LKML, but it was some years ago, and nothing like it has been
> implemented.
>
> (1) Having supplementary user ids like there are supplementary group ids and
> system calls getuids() and setuids() that work like getgroups() and
> setgroups()
>
> (2) Allowing processes to pass user and group ids via sockets.
>
> Both (1) and (2) would solve my problem. Now my question is whether there are
> any fundamental flaws with (1) or (2), or whether the right way to solve my
> problem is another one.
>
Changing to a limited set of IDs is interesting, I have never looked at
what happens when a thread does setuid, and neither the man page or a
very quick look at the code tells me. But the portable way is to do the
things needed for init, then fork into three processes and give each a
UID as needed. I would really evaluate the design which made this
necessary, to see if some IPC could be used. Certainly that's more
likely to be portable.

--
Bill Davidsen <davidsen@tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
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