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List: fedora-devel-list
Subject: Re: utmp and friends
From: Bill Nottingham <notting () redhat ! com>
Date: 2007-06-27 12:25:24
Message-ID: 20070627122524.GD23234 () nostromo ! devel ! redhat ! com
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Miroslav Lichvar (mlichvar@redhat.com) said:
> > The entire idea of utempter is so that the terminal *doesn't* need to be
> > setgid - if it's setgid, what's the point of a helper?
>
> Well, the terminal doesn't need to be setgid utmp, but only utempter.
> Setgid utempter allows only adding/removing entries in utmp while
> setgid utmp allows unrestricted access.
Only if it's coded wrong (doesn't drop privs, etc.). By adding a
setgid to the binary, you're making the point of separating it
merely a code-sharing issue, as opposed to any huge security gains.
I'd remove the block on the directory - basically, you're intentionally
breaking user's environments for illusory security.
Bill
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