From owner-freebsd-security@FreeBSD.ORG  Wed Feb  6 16:54:13 2013
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 9CBAFB74
 for <freebsd-security@freebsd.org>; Wed,  6 Feb 2013 16:54:13 +0000 (UTC)
 (envelope-from andreas@romab.com)
Received: from rot13.romab.com (rot13.romab.com [213.115.13.4])
 by mx1.freebsd.org (Postfix) with ESMTP id 534A2904
 for <freebsd-security@freebsd.org>; Wed,  6 Feb 2013 16:54:13 +0000 (UTC)
Received: by rot13.romab.com (Postfix, from userid 1004)
 id 41BCB849; Wed,  6 Feb 2013 17:48:23 +0100 (CET)
Received: from stiletto.u88.romab.com (localhost [127.0.0.1])
 by rot13.romab.com (Postfix) with ESMTP id 2EE74847
 for <freebsd-security@freebsd.org>; Wed,  6 Feb 2013 17:48:23 +0100 (CET)
Message-ID: <5112895E.5050506@romab.com>
Date: Wed, 06 Feb 2013 17:48:30 +0100
From: Andreas Jonsson <andreas@romab.com>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8;
 rv:17.0) Gecko/20130107 Thunderbird/17.0.2
MIME-Version: 1.0
To: freebsd-security@freebsd.org
Subject: FreeBSD 9.1 MAC Multilabel on nullfs
X-Enigmail-Version: 1.5
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: "Security issues \[members-only posting\]"
 <freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-security>, 
 <mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
 <mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Feb 2013 16:54:13 -0000


Hi List!
Don't see much discussion about MAC here, time to change that! :-)

Currently trying to set up a service jail, according to instructions in
the handbook[1]. The problem I'm facing is that nullfs does not seem to
support multilabeled filesystems, or am i missing something?

ls -lZ /usr/js/testjail/var/run/test
-rw-r--r--  1 root  wheel  biba/equal 0 Feb  6 17:15
/usr/js/testjail/var/run/test

Nullfs-mounting it inside the jail:
ls -lZ /usr/j/testjail/s/var/run/test
-rw-r--r--  1 root  wheel  biba/high 0 Feb  6 17:15
/usr/j/testjail/s/var/run/test

Currently, it looks like this:
/usr/j/mroot on /usr/j/testjail (nullfs, local, nosuid, read-only)
/usr/js/testjail on /usr/j/testjail/s (nullfs, local, nosuid)
devfs on /usr/j/testjail/dev (devfs, local, multilabel)

>From inside the jail, (where this directory is mounted), the following
maclabel appears to be the following instead:
# ls -lZ /var/run/test
-rw-r--r--  1 root  wheel  biba/high 0 Feb  6 16:15 /var/run/test

Does the list have any suggestions for workarounds? One alternative
would be to create a jail without shared root filesystems and skip
nullfs, but perhaps there are other tricks i am not aware of?

BR
Andreas

[1].
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails-application.html