135 lines
3.9 KiB
Groff
135 lines
3.9 KiB
Groff
.\" Copyright (c) 2002 Networks Associates Technology, Inc.
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 10, 2002
|
|
.Os
|
|
.Dt MAC_IFOFF 4
|
|
.Sh NAME
|
|
.Nm mac_ifoff
|
|
.Nd "interface silencing policy"
|
|
.Sh SYNOPSIS
|
|
To compile the interface silencing policy into your kernel,
|
|
place the following lines in your kernel
|
|
configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "options MAC"
|
|
.Cd "options MAC_IFOFF"
|
|
.Ed
|
|
.Pp
|
|
Alternately, to load the interface silencing policy module at boot time,
|
|
place the following line in your kernel configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "options MAC"
|
|
.Ed
|
|
.Pp
|
|
and in
|
|
.Xr loader.conf 5 :
|
|
.Bd -literal -offset indent
|
|
mac_ifoff_load="YES"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
interface silencing module allows administrators to enable and disable
|
|
incoming and outgoing data flow on system network interfaces
|
|
via the
|
|
.Xr sysctl 8
|
|
interface.
|
|
.Pp
|
|
To disable network traffic over the loopback
|
|
.Pq Xr lo 4
|
|
interface, set the
|
|
.Xr sysctl 8
|
|
OID
|
|
.Va security.mac.ifoff.lo_enabled
|
|
to 0 (default 1).
|
|
.Pp
|
|
To enable network traffic over other interfaces,
|
|
set the
|
|
.Xr sysctl 8
|
|
OID
|
|
.Va security.mac.ifoff.other_enabled
|
|
to 1 (default 0).
|
|
.Pp
|
|
To allow BPF traffic to be received,
|
|
even while other traffic is disabled,
|
|
set the
|
|
.Xr sysctl 8
|
|
OID
|
|
.Va security.mac.ifoff.bpfrecv_enabled
|
|
to 1 (default 0).
|
|
.Ss Label Format
|
|
No labels are defined.
|
|
.Sh SEE ALSO
|
|
.Xr lomac 4 ,
|
|
.Xr mac 4 ,
|
|
.Xr mac_bsdextended 4 ,
|
|
.Xr mac_lomac 4 ,
|
|
.Xr mac_mls 4 ,
|
|
.Xr mac_none 4 ,
|
|
.Xr mac_partition 4 ,
|
|
.Xr mac_portacl 4 ,
|
|
.Xr mac_seeotheruids 4 ,
|
|
.Xr mac_test 4 ,
|
|
.Xr mac 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
policy module first appeared in
|
|
.Fx 5.0
|
|
and was developed by the
|
|
.Tn TrustedBSD
|
|
Project.
|
|
.Sh AUTHORS
|
|
This software was contributed to the
|
|
.Fx
|
|
Project by Network Associates Labs,
|
|
the Security Research Division of Network Associates
|
|
Inc.
|
|
under DARPA/SPAWAR contract N66001-01-C-8035
|
|
.Pq Dq CBOSS ,
|
|
as part of the DARPA CHATS research program.
|
|
.Sh BUGS
|
|
See
|
|
.Xr mac 9
|
|
concerning appropriateness for production use.
|
|
The
|
|
.Tn TrustedBSD
|
|
MAC Framework is considered experimental in
|
|
.Fx .
|
|
.Pp
|
|
While the MAC Framework design is intended to support the containment of
|
|
the root user, not all attack channels are currently protected by entry
|
|
point checks.
|
|
As such, MAC Framework policies should not be relied on, in isolation,
|
|
to protect against a malicious privileged user.
|