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mac.page
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<!--
Copyright (c) 2000-2012 Robert N. M. Watson
Copyright (c) 2001 Leigh Denault
Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
All rights reserved.
This software was developed for the FreeBSD Project by Chris
Costello at Safeport Network Services and McAfee Research,
the Security Research Division of Network Associates, Inc. under
DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
DARPA CHATS research program.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
-->
<page role="mac">
<title>TrustedBSD Mandatory Access Control (MAC) Framework</title>
<section>
<title>TrustedBSD Mandatory Access Control (MAC) Framework</title>
<html>
<p>Mandatory access controls extend operating system access control
policy by allowing administrators to enforce additional constraints
on user and application behavior.
The TrustedBSD MAC Framework is a kernel programming interface
allowing loadable modules to augment the system security policy in
order to implement mandatory access control in a flexible manner.</p>
<p>The TrustedBSD MAC Framework first shipped in FreeBSD 5.0, with
significant functionality, quality, and performance enhancements in
later releases. Supported policy modules include rule-based file
system firewall support, TCP/UDP port access control lists,
inter-user process visibility controls, as well as classic mandatory
access control policies such as Multi-Level Security (MLS) with
compartments, and fixed- and floating-label Biba integrity policies.
Third party policy modules include cryptographic checksums on system
binaries, and <a href="sebsd.html">SEBSD</a>, a port of the NSA
FLASK/SELinux policy to FreeBSD. A number of commercial
FreeBSD-based products make use of the TrustedBSD MAC Framework to
locally modify the operating system security policy.</p>
<p>MAC Framework and general MAC user documentation and a number of
implementation papers may be found on the <a
href="docs.html">documentation page</a>. A detailed discussion of
the architecture and industry adoption of the MAC Framework,
including use in FreeBSD and Apple's Mac OS X and iOS, may be found
in Robert Watson's PhD Dissertation, <a
href="http://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-818.html">New
Approaches to Operating System Security Extensibility</a>.</p>
<p>The TrustedBSD MAC Framework has also been present in Mac OS X
releases as of "Leopard", where it is used to implement Seatbelt
and other system security services; on the iPhone and iPad, the
MAC Framework is used for App sandboxing. This port of the MAC
Framework was performed initially as part of <a
href="sedarwin.html">SEDarwin</a>, which also included a port of
FLASK and SELinux to the Mac OS X platform. Other prominent
industry consumers of the MAC Framework include Juniper Networks
and McAfee (now Intel).</p>
</html>
</section>
</page>