Date: Wed, 15 Nov 2000 09:09:34 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: freebsd-hackers@FreeBSD.ORG Subject: Re: changing a running process's credentials Message-ID: <20001115090934.A830@fw.wintelcom.net> In-Reply-To: <20001115190135.E309@ringworld.oblivion.bg>; from roam@orbitel.bg on Wed, Nov 15, 2000 at 07:01:35PM %2B0200 References: <20001115161316.C309@ringworld.oblivion.bg> <20001115084722.I29448@fw.wintelcom.net> <20001115190135.E309@ringworld.oblivion.bg>
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* Peter Pentchev <roam@orbitel.bg> [001115 09:02] wrote: > > > > Well there's setuid for you. > > Hmm.. I've also received two private mails so far, pointing me to setuid(). > The problem is, I want to force a new UID on *another* process without > its knowledge. setuid() only works on the process invoking it, so > both the 'force' and the 'without its knowledge' part fall by the wayside :( > > > What comes to mind is using the cmsg stuff that's normally used to > > pass file descriptors and authentication information to pass the > > ability to setuid over to another application over a unix domain > > pipe. The recieving process would read using recvmsg determine if > > the passed uid is 'ok' (the kernel would hold it in the proc struct > > in a temporary), if it 'wanted' this uid it could then call some > > variation of setuid to switch to this recieved uid. > > Yeah; problem is, as I said above, I do not want the receiving process > to do anything special - just to wake up with a shiny new uid (this > would probably surprise the hell out of most programs, but oh well :) Unless this syscall was restricted to root, or a small subset of uid's it would cause some severe security issues from my point of view. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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