Home Developers Documentation Source code ACLs Audit BSMtrace ExtAttr + UFS2 GEOM + GBDE
Mailing Lists News Legal MAC Framework OpenBSM OpenPAM Privileges SEBSD SEDarwin

TrustedBSD Mandatory Access Control (MAC) Framework

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.

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 SEBSD, 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.

MAC Framework and general MAC user documentation and a number of implementation papers may be found on the documentation page. 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, New Approaches to Operating System Security Extensibility.

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 SEDarwin, 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).

    Copyright 2000-2012 Robert N. M. Watson. All rights reserved.
    Copyright 2005 SPARTA, Inc. All rights reserved.
    Copyright 2002, Leigh T. Denault. All rights reserved.
    Copyright 2002, 2003 Networks Associates, Inc. All rights reserved.