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Date: Tue, 10 Jun 2003 00:14:42 -0700
From: Jon DeShirley <jond@uidaho.edu>
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To: Brett Glass <brett@lariat.org>
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cc: Doug Barton <DougB@freebsd.org>
cc: security@freebsd.org
Subject: Re: Removable media security in FreeBSD
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On Tue, 9 Jun 2003 Brett Glass wrote:
> At 05:21 PM 6/9/2003, Doug Barton wrote:
> 
>>On Mon, 9 Jun 2003, Brett Glass wrote:
>>
>>>Allowing the user to use sudo would effectively be giving him/her root
>>>privileges, which we explicitly don't want to do.
>>
>>No it wouldn't. You can specify the commands that you allow each user to
>>run. 
> 
> Ah, but letting the user mount and unmount things effectively lets that
> person do anything he or she wants, by switching around what's mounted
> at key mountpoints.

Example:

%users  NOPASSWD:ALL=/sbin/mount /cdrom,/sbin/umount /cdrom

What does this do?  It allows users in the group 'users' to run the 
explicit commands ONLY.

Now, unless you give them sudo access to vi /etc/fstab or something, 
there's no way '/sbin/mount /cdrom' is going to change behavior.

btw, I would suggest reading the sudoers manual: 
http://www.courtesan.com/sudo/man/sudoers.html

Cheers,

--jon