188 lines
5.8 KiB
Groff
188 lines
5.8 KiB
Groff
.\" Copyright (c) 2001, 2003 Networks Associates Technology, Inc.
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project by Chris
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.\" Costello at Safeport Network Services and Network Associates
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.\" Laboratories, the Security Research Division of Network Associates,
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.\" Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part
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.\" of the DARPA CHATS research program.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 19, 2003
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.Dt MAC 3
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.Os
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.Sh NAME
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.Nm mac
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.Nd introduction to the MAC security API
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mac.h
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.Pp
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In the kernel configuration file:
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.Cd "options MAC"
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.Sh DESCRIPTION
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.Fx
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permits administrators to define Mandatory Access Control labels
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defining levels for the privacy and integrity of data,
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overriding discretionary policies
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for those objects.
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Not all objects currently provide support for MAC labels,
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and MAC support must be explicitly enabled by the administrator.
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The library calls include routines to retrieve, duplicate,
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and set MAC labels associated with files and processes.
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.Pp
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POSIX.1e describes a set of MAC manipulation routines
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to manage the contents of MAC labels,
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as well as their relationships with
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files and processes;
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almost all of these support routines
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are implemented in
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.Fx .
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.Pp
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Available functions, sorted by behavior, include:
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.Bl -tag -width indent
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.It Fn mac_get_fd
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This function is described in
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.Xr mac_get 3 ,
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and may be used to retrieve the
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MAC label associated with
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a specific file descriptor.
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.It Fn mac_get_file
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This function is described in
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.Xr mac_get 3 ,
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and may be used to retrieve the
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MAC label associated with
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a named file.
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.It Fn mac_get_proc
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This function is described in
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.Xr mac_get 3 ,
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and may be used to retrieve the
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MAC label associated with
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the calling process.
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.It Fn mac_set_fd
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This function is described in
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.Xr mac_set 3 ,
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and may be used to set the
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MAC label associated with
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a specific file descriptor.
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.It Fn mac_set_file
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This function is described in
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.Xr mac_set 3 ,
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and may be used to set the
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MAC label associated with
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a named file.
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.It Fn mac_set_proc
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This function is described in
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.Xr mac_set 3 ,
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and may be used to set the
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MAC label associated with
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the calling process.
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.It Fn mac_free
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This function is described in
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.Xr mac_free 3 ,
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and may be used to free
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userland working MAC label storage.
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.It Fn mac_from_text
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This function is described in
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.Xr mac_text 3 ,
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and may be used to convert
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a text-form MAC label
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into a working
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.Vt mac_t .
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.It Fn mac_prepare
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.It Fn mac_prepare_file_label
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.It Fn mac_prepare_ifnet_label
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.It Fn mac_prepare_process_label
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These functions are described in
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.Xr mac_prepare 3 ,
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and may be used to preallocate storage for MAC label retrieval.
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.Xr mac_prepare 3
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prepares a label based on caller-specified label names; the other calls
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rely on the default configuration specified in
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.Xr mac.conf 5 .
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.It Fn mac_to_text
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This function is described in
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.Xr mac_text 3 ,
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and may be used to convert a
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.Vt mac_t
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into a text-form MAC label.
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.El
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The behavior of some of these calls is influenced by the configuration
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settings found in
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.Xr mac.conf 5 ,
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the MAC library run-time configuration file.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/mac.conf" -compact
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.It Pa /etc/mac.conf
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MAC library configuration file, documented in
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.Xr mac.conf 5 .
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Provides default behavior for applications aware of MAC labels on
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system objects, but without policy-specific knowledge.
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.El
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.Sh IMPLEMENTATION NOTES
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.Fx Ns 's
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support for POSIX.1e interfaces and features
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is
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.Ud .
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.Sh SEE ALSO
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.Xr mac_free 3 ,
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.Xr mac_get 3 ,
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.Xr mac_prepare 3 ,
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.Xr mac_set 3 ,
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.Xr mac_text 3 ,
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.Xr mac 4 ,
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.Xr mac.conf 5 ,
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.Xr mac 9
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.Sh STANDARDS
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These APIs are loosely based on the APIs described in POSIX.1e.
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POSIX.1e is described in IEEE POSIX.1e draft 17.
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Discussion of the draft
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continues on the cross-platform POSIX.1e implementation mailing list.
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To join this list, see the
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.Fx
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POSIX.1e implementation page
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for more information.
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However, the resemblence of these APIs to the POSIX APIs is only loose,
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as the POSIX APIs were unable to express many notions required for
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flexible and extensible access control.
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.Sh HISTORY
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Support for Mandatory Access Control was introduced in
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.Fx 5.0
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as part of the
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.Tn TrustedBSD
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Project.
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.Sh BUGS
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The
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.Tn TrustedBSD
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MAC Framework and associated policies, interfaces, and
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applications are considered to be an experimental feature in
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.Fx .
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Sites considering production deployment should keep the experimental
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status of these services in mind during any deployment process.
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See also
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.Xr mac 9
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for related considerations regarding the kernel framework.
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