1.\" Copyright (c) 2002, 2003 Networks Associates Technology, Inc. 2.\" All rights reserved. 3.\" 4.\" This software was developed for the FreeBSD Project by Chris Costello 5.\" at Safeport Network Services and Network Associates Laboratories, the 6.\" Security Research Division of Network Associates, Inc. under 7.\" DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 8.\" DARPA CHATS research program. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" $FreeBSD$ 32.\" 33.Dd July 25, 2015 34.Dt MAC_STUB 4 35.Os 36.Sh NAME 37.Nm mac_stub 38.Nd "MAC policy stub module" 39.Sh SYNOPSIS 40To compile the stub policy 41into your kernel, place the following lines in your kernel 42configuration file: 43.Bd -ragged -offset indent 44.Cd "options MAC" 45.Cd "options MAC_STUB" 46.Ed 47.Pp 48Alternately, to load the stub module at boot time, place the following line 49in your kernel configuration file: 50.Bd -ragged -offset indent 51.Cd "options MAC" 52.Ed 53.Pp 54and in 55.Xr loader.conf 5 : 56.Bd -literal -offset indent 57mac_stub_load="YES" 58.Ed 59.Sh DESCRIPTION 60The 61.Nm 62policy module implements a stub MAC policy that has no effect on 63access control in the system. 64Unlike 65.Xr mac_none 4 , 66each MAC entry point is defined as a 67.Dq no-op , 68so the policy module will be entered for each event, but no change 69in system behavior should result. 70.Ss Label Format 71No labels are defined for 72.Nm . 73.Sh SEE ALSO 74.Xr mac 4 , 75.Xr mac_biba 4 , 76.Xr mac_bsdextended 4 , 77.Xr mac_ifoff 4 , 78.Xr mac_lomac 4 , 79.Xr mac_mls 4 , 80.Xr mac_none 4 , 81.Xr mac_partition 4 , 82.Xr mac_portacl 4 , 83.Xr mac_seeotheruids 4 , 84.Xr mac_test 4 , 85.Xr mac 9 86.Sh HISTORY 87The 88.Nm 89policy module first appeared in 90.Fx 5.1 91and was developed by the 92.Tn TrustedBSD 93Project. 94.Sh AUTHORS 95This software was contributed to the 96.Fx 97Project by Network Associates Labs, 98the Security Research Division of Network Associates 99Inc. 100under DARPA/SPAWAR contract N66001-01-C-8035 101.Pq Dq CBOSS , 102as part of the DARPA CHATS research program. 103.Sh BUGS 104While the MAC Framework design is intended to support the containment of 105the root user, not all attack channels are currently protected by entry 106point checks. 107As such, MAC Framework policies should not be relied on, in isolation, 108to protect against a malicious privileged user. 109