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150 lines
4.7 KiB
Groff
150 lines
4.7 KiB
Groff
.\" Copyright (c) 2002 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 Costello
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.\" at Safeport Network Services and Network Associates Laboratories, the
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.\" Security Research Division of Network Associates, Inc. under
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.\" DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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.\" 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 May 21, 2005
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.Os
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.Dt MAC_BSDEXTENDED 4
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.Sh NAME
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.Nm mac_bsdextended
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.Nd "file system firewall policy"
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.Sh SYNOPSIS
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To compile the file system firewall policy into your kernel,
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place the following lines in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options MAC"
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.Cd "options MAC_BSDEXTENDED"
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.Ed
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.Pp
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Alternately, to load the file system firewall policy module at boot time,
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place the following line in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options MAC"
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.Ed
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.Pp
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and in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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mac_bsdextended_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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security policy module provides an interface for the system administrator
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to impose mandatory rules regarding users and some system objects.
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Rules are uploaded to the module
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(typically using
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.Xr ugidfw 8 ,
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or some other tool utilizing
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.Xr libugidfw 3 )
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where they are stored internally
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and used to determine whether to allow or deny specific accesses
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(see
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.Xr ugidfw 8 ) .
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.Sh IMPLEMENTATION NOTES
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While the traditional
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.Xr mac 9
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entry points are implemented,
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policy labels are not used;
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instead, access control decisions are made by iterating through the internal
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list of rules until a rule
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which denies the particular access
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is found,
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or the end of the list is reached.
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The
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.Nm
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policy works similar to
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.Xr ipfw 8
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or by using a
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.Em first match semantic .
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This means that not all rules are applied,
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only the first matched rule; thus if
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Rule A allows access and Rule B blocks
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access, Rule B will never be applied.
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.Pp
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.Ss Sysctls
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The following sysctls may be used to tweak the behavior of
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.Nm :
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.Bl -tag -width indent
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.It Va security.mac.bsdextended.enabled
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Set to zero or one to toggle the policy off or on.
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.It Va security.mac.bsdextended.rule_count
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List the number of defined rules, the maximum rule count is
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current set at 256.
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.It Va security.mac.bsdextended.rule_slots
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List the number of rule slots currently being used.
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.It Va security.mac.bsdextended.firstmatch_enabled
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Toggle between the old all rules match functionality
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and the new first rule matches functionality.
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This is enabled by default.
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.It Va security.mac.bsdextended.logging
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Log all access violations via the
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.Dv AUTHPRIV
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.Xr syslog 3
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facility.
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.It Va security.mac.bsdextended.rules
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Currently does nothing interesting.
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.El
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.Sh SEE ALSO
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.Xr libugidfw 3 ,
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.Xr syslog 3 ,
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.Xr mac 4 ,
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.Xr mac_biba 4 ,
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.Xr mac_ifoff 4 ,
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.Xr mac_lomac 4 ,
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.Xr mac_mls 4 ,
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.Xr mac_none 4 ,
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.Xr mac_partition 4 ,
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.Xr mac_portacl 4 ,
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.Xr mac_seeotheruids 4 ,
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.Xr mac_test 4 ,
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.Xr ipfw 8 ,
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.Xr ugidfw 8 ,
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.Xr mac 9
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.Sh HISTORY
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The
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.Nm
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policy module first appeared in
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.Fx 5.0
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and was developed by the
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.Tn TrustedBSD
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Project.
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.Pp
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The "match first case" and logging capabilities were later added by
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.An Tom Rhodes Aq trhodes@FreeBSD.org .
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.Sh AUTHORS
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This software was contributed to the
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.Fx
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Project by NAI Labs, the Security Research Division of Network Associates
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Inc.\& under DARPA/SPAWAR contract N66001-01-C-8035
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.Pq Dq CBOSS ,
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as part of the DARPA CHATS research program.
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