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Date: Sat, 29 Aug 2009 12:03:36 -0400
From: Jerry McAllister <jerrymc@msu.edu>
To: Tim Judd <tajudd@gmail.com>
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Cc: RW <rwmaillists@googlemail.com>, freebsd-questions@freebsd.org
Subject: Re: SUID permission on Bash script
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On Fri, Aug 28, 2009 at 08:10:59PM -0600, Tim Judd wrote:

> On 8/28/09, RW <rwmaillists@googlemail.com> wrote:
> > On Fri, 28 Aug 2009 11:54:19 +0300
> > Giorgos Keramidas <keramida@ceid.upatras.gr> wrote:
> >
> >> On Fri, 28 Aug 2009 09:24:35 +0100, Jeronimo Calvo
> >> <jeronimocalvop@googlemail.com> wrote:
> >
> >> > As far as i know, using SUID, script must runs with root
> >> > permissions... so i shoudnt get "Permission denied", what im doing
> >> > wrong??
> >>
> >> No it must not.  There are security reasons why shell scripts are not
> >> setuid-capable.  You can find some of them in the archives of the
> >> mailing list, going back at least until 1997.
> >
> > I'm bit puzzled by this, previous threads have given the impression
> > that this is a myth, for example:
> >
> > http://www.mail-archive.com/freebsd-questions@freebsd.org/msg185134.html
> >
> > So are scripts actually incapable of running setuid?
> 
> 
> Dunno, but this dawns on me..
> 
> what defines a script?  I've always defined a script that starts with
> a #! shebang.
> 
> So the script can be SUID, but the interpreter/shell isn't.  Is that
> why it doesn't work?

It doesn't work because the system does not allow it - for security
reasons.   You could fish around and defeat that but don't.

The most common way to get around it is create a tiny binary that
can run Setuid which merely invokes your script.

The better way is to use Sudo as has been suggested already
in this thread.

////jerry

> 
> 
> --Tim
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