Volker Kroll wrote:
On Tue, 2003-12-09 at 18:25, Stas Bekman wrote:


% su - nobody

This account is currently not available.



So I think, here is the problem: grep ^nobody /etc/passwd nobody:x:99:99:Nobody:/:/sbin/nologin ^^^^^^^^^^^^ nobody cannot login and allocate a shell


The 'su - nobody' test above should give us the answer where the fault is.


and it does :-)

Which probably means that your perl POSIX implementation is broken.


I've tried to emulate your case:
nobody:x:65534:65534:Nobody:/:/sbin/nologin
before it was:
nobody:x:65534:65534:Nobody:/:/bin/sh

% perl -le 'require POSIX; POSIX::setuid(65534) or die "failed to setuid: $@"; POSIX::setgid(65534) or die "failed to setgid: $@"; \ print -r q{/root} && -w _ && -x _ ? q{OK} : q{NOK}; '
failed to setgid: at -e line 1.


As you can see setgid has failed, but not setuid. Does this fail for you:

% perl -le 'require POSIX; POSIX::setgid(99) or die "failed to run: $@";'

I wonder why setuid doesn't fail for me:
% perl -le 'require POSIX; POSIX::setuid(65534) or die "failed to setuid: $@"; \
print -r q{/root} && -w _ && -x _ ? q{OK} : q{NOK}; '
OK


I think this is definitely broken on my machine, since my /root is drwx------ and that means that setuid() didn't do its job and the process is still running as the root user.

So if you change /etc/passwd's nobody entry to have /bin/sh instead of /sbin/nologin the test suite should now successfully detect that it won't be able to work from that directory.

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