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Re: SELinux newbie help please



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On 01/09/2012 07:24 AM, Alain Williams wrote:
> On Fri, Jan 06, 2012 at 09:47:09AM -0500, Edward Ned Harvey wrote:
>>> From: selinux-bounces@xxxxxxxxxxxxxxxxxxxxxxx [mailto:selinux- 
>>> bounces@xxxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Alain Williams
>>> 
>>> I want one user to, on login, run a script setuid root -- it
>>> needs to be able to read all files in one part of the file
>>> system to back that part up to an externally mounted USB
>>> drive.
>>> 
>>> I have a small setuid root program (written in C) that just
>>> runs the shell script.
>> 
>> This doesn't sound like a selinux thing.  It sounds like you
>> should probably just use sudo.  You should be able to add the
>> "sudo /path/to/some/script" into your .bash_login or something
>> like that.
>> 
>> Sudo is a setuid root program (written in C) that allows you to
>> run other things as other users.  It's highly stable and secure,
>> probably much more reliable and secure than the average homegrown
>> C setuid root program.  ;-)
>> 
>> You can configure sudo using the "visudo" command as root.  You
>> can configure the behavior you want by adding a line like this: 
>> awilliam    ALL=(ALL) NOPASSWD: /path/to/some/script
> 
> This is what my workaround is. However: I would like to work out
> how to do it directly by writing selinux rules/... - the purpose is
> as much to teach me how to do things with selinux as to achive the
> end result.
> 
> So: back to my original question ....
> 

I would say that there is nothing about SELinux that should block your
access. Since you are logging in as unconfined_t, you should be able
to execute setuid apps.  I would make sure your stuff is working with
SELinux in permissive mode, before determining whether SELinux is
blocking access.
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