Messages in this thread | | | Date | Tue, 02 Oct 2007 18:38:58 -0400 | From | Bill Davidsen <> | Subject | Re: One process with multiple user ids. |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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