mac_ifoff (4)

Leading comments

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...

(The comments found at the beginning of the groff file "man4/mac_ifoff.4freebsd".)

NAME

mac_ifoff - interface silencing policy

SYNOPSIS

To compile the interface silencing policy into your kernel, place the following lines in your kernel configuration file:

options MAC options MAC_IFOFF

Alternately, to load the interface silencing policy module at boot time, place the following line in your kernel configuration file:

options MAC

and in loader.conf5:

mac_ifoff_load="YES"

DESCRIPTION

The interface silencing module allows administrators to enable and disable incoming and outgoing data flow on system network interfaces via the sysctl(8) interface.

To disable network traffic over the loopback (lo(4) ) interface, set the sysctl(8) OID security.mac.ifoff.lo_enabled to 0 (default 1).

To enable network traffic over other interfaces, set the sysctl(8) OID security.mac.ifoff.other_enabled to 1 (default 0).

To allow BPF traffic to be received, even while other traffic is disabled, set the sysctl(8) OID security.mac.ifoff.bpfrecv_enabled to 1 (default 0).

Label Format

No labels are defined.

SEE ALSO

mac(4), mac_bsdextended4, mac_lomac4, mac_mls4, mac_none4, mac_partition4, mac_portacl4, mac_seeotheruids4, mac_test4, mac(9)

HISTORY

The policy module first appeared in Fx 5.0 and was developed by the TrustedBSD Project.

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 (``CBOSS'' ) as part of the DARPA CHATS research program.

BUGS

See mac(9) concerning appropriateness for production use. The TrustedBSD MAC Framework is considered experimental in Fx .

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.