All rights reserved.
This software was developed for the FreeBSD Project by Chris
Costello at Safeport Network Services and Network Associates
Laboratories, 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.
$FreeBSD: head/lib/libc/posix1e/mac.3 113732 2003-04-20 02:56:16Z rwatson $
.Dd December 21, 2001 .Dt MAC 3 .Os .Sh NAME .Nm mac .Nd Introduction to the MAC security API .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/mac.h
p In the kernel configuration file: .Cd "options MAC" .Sh DESCRIPTION .Fx permits administrators to define Mandatory Access Control labels defining levels for the privacy and integrity of data, overriding discretionary policies for those objects. Not all objects currently provide support for MAC labels, and MAC support must be explicitly enabled by the administrator. The library calls include routines to retrieve, duplicate, and set MAC labels associated with files and processes.
p POSIX.1e describes a set of MAC manipulation routines to manage the contents of MAC labels, as well as their relationships with files and processes; almost all of these support routines are implemented in .Fx .
p Available functions, sorted by behavior, include: l -tag -width indent t Fn mac_get_fd This function is described in .Xr mac_get 3 , and may be used to retrieve the MAC label associated with a specific file descriptor. t Fn mac_get_file This function is described in .Xr mac_get 3 , and may be used to retrieve the MAC label associated with a named file. t Fn mac_get_proc This function is described in .Xr mac_get 3 , and may be used to retrieve the MAC label associated with the calling process. t Fn mac_set_fd This function is described in .Xr mac_set 3 , and may be used to set the MAC label associated with a specific file descriptor. t Fn mac_set_file This function is described in .Xr mac_set 3 , and may be used to set the MAC label associated with a named file. t Fn mac_set_proc This function is described in .Xr mac_set 3 , and may be used to set the MAC label associated with the calling process. t Fn mac_free This function is described in .Xr mac_free 3 , and may be used to free userland working MAC label storage. t Fn mac_from_text This function is described in .Xr mac_text 3 , and may be used to convert a text-form MAC label into a working .Vt mac_t . t Fn mac_prepare t Fn mac_prepare_file_label t Fn mac_prepare_ifnet_label t Fn mac_prepare_process_label These functions are described in .Xr mac_prepare 3 , and may be used to preallocate storage for MAC label retrieval. .Xr mac_prepare 3 prepares a label based on caller-specified label names; the other calls rely on the default configuration specified in .Xr mac.conf 5 . t Fn mac_to_text This function is described in .Xr mac_text 3 , and may be used to convert a .Vt mac_t into a text-form MAC label. .El .Sh IMPLEMENTATION NOTES .Fx Ns 's support for POSIX.1e interfaces and features is d . .Sh SEE ALSO .Xr mac_free 3 , .Xr mac_get 3 , .Xr mac_prepare 3 , .Xr mac_set 3 , .Xr mac_text 3 , .Xr mac 4 , .Xr mac 9 .Sh STANDARDS These APIs are loosely based on the APIs described in POSIX.1e. POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion of the draft continues on the cross-platform POSIX.1e implementation mailing list. To join this list, see the .Fx POSIX.1e implementation page for more information. However, the resemblence of these APIs to the POSIX APIs is only loose, as the POSIX APIs were unable to express many notions required for flexible and extensible access control. .Sh HISTORY Support for Mandatory Access Control was introduced in .Fx 5.0 as part of the .Tn TrustedBSD Project. .Sh BUGS The .Tn TrustedBSD MAC Framework and associated policies, interfaces, and applications are considered to be an experimental feature in .Fx . Sites considering production deployment should keep the experimental status of these services in mind during any deployment process. See also .Xr mac 9 for related considerations regarding the kernel framework.