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MAC_BSDEXTENDED(4)     FreeBSD Kernel Interfaces Manual	    MAC_BSDEXTENDED(4)

NAME
     mac_bsdextended --	file system firewall policy

SYNOPSIS
     To	compile	the file system	firewall policy	into your kernel, place	the
     following lines in	your kernel configuration file:

	   options MAC
	   options MAC_BSDEXTENDED

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

	   options MAC

     and in loader.conf(5):

	   mac_bsdextended_load="YES"

DESCRIPTION
     The mac_bsdextended security policy module	provides an interface for the
     system administrator to impose mandatory rules regarding users and	some
     system objects.  Rules are	uploaded to the	module (typically using
     ugidfw(8),	or some	other tool utilizing libugidfw(3)) where they are
     stored internally and used	to determine whether to	allow or deny specific
     accesses (see ugidfw(8)).

IMPLEMENTATION NOTES
     While the traditional mac(9) entry	points are implemented,	policy labels
     are not used; instead, access control decisions are made by iterating
     through the internal list of rules	until a	rule which denies the particu-
     lar access	is found, or the end of	the list is reached.  The
     mac_bsdextended policy works similar to ipfw(8) or	by using a first match
     semantic.	This means that	not all	rules are applied, only	the first
     matched rule; thus	if Rule	A allows access	and Rule B blocks access, Rule
     B will never be applied.

   Sysctls
     The following sysctls may be used to tweak	the behavior of
     mac_bsdextended:

     security.mac.bsdextended.enabled
	     Set to zero or one	to toggle the policy off or on.

     security.mac.bsdextended.rule_count
	     List the number of	defined	rules, the maximum rule	count is cur-
	     rent set at 256.

     security.mac.bsdextended.rule_slots
	     List the number of	rule slots currently being used.

     security.mac.bsdextended.firstmatch_enabled
	     Toggle between the	old all	rules match functionality and the new
	     first rule	matches	functionality.	This is	enabled	by default.

     security.mac.bsdextended.logging
	     Log all access violations via the AUTHPRIV	syslog(3) facility.

     security.mac.bsdextended.rules
	     Currently does nothing interesting.

SEE ALSO
     libugidfw(3), syslog(3), mac(4), mac_biba(4), mac_ifoff(4), mac_lomac(4),
     mac_mls(4), mac_none(4), mac_partition(4),	mac_portacl(4),
     mac_seeotheruids(4), mac_test(4), ipfw(8),	ugidfw(8), mac(9)

HISTORY
     The mac_bsdextended policy	module first appeared in FreeBSD 5.0 and was
     developed by the TrustedBSD Project.

     The "match	first case" and	logging	capabilities were later	added by Tom
     Rhodes <trhodes@FreeBSD.org>.

AUTHORS
     This software was contributed to the FreeBSD Project by NAI 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.

FreeBSD	10.1			 May 21, 2005			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=mac_bsdextended&sektion=4&manpath=FreeBSD+10.1-RELEASE>

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