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mac_bsdextended(4) [linux man page]

MAC_BSDEXTENDED(4)					   BSD 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 iterat-
     ing through the internal list of rules until a rule which denies the particular 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 current 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.

BSD
								   May 21, 2005 							       BSD

Check Out this Related Man Page

MAC_SEEOTHERUIDS(4)					   BSD Kernel Interfaces Manual 				       MAC_SEEOTHERUIDS(4)

NAME

     mac_seeotheruids -- simple policy controlling whether users see other users

SYNOPSIS

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

	   options MAC
	   options MAC_SEEOTHERUIDS

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

	   options MAC

     and in loader.conf(5):

	   mac_seeotheruids_load="YES"

DESCRIPTION

     The mac_seeotheruids policy module, when enabled, denies users to see processes or sockets owned by other users.

     To enable mac_seeotheruids, set the sysctl OID security.mac.seeotheruids.enabled to 1.  To permit superuser awareness of other credentials by
     virtue of privilege, set the sysctl OID security.mac.seeotheruids.suser_privileged to 1.

     To allow users to see processes and sockets owned by the same primary group, set the sysctl OID
     security.mac.seeotheruids.primarygroup_enabled to 1.

     To allow processes with a specific group ID to be exempt from the policy, set the sysctl OID security.mac.seeotheruids.specificgid_enabled to
     1, and security.mac.seeotheruids.specificgid to the group ID to be exempted.

   Label Format
     No labels are defined for mac_seeotheruids.

SEE ALSO

     mac(4), mac_biba(4), mac_bsdextended(4), mac_ifoff(4), mac_lomac(4), mac_mls(4), mac_none(4), mac_partition(4), mac_portacl(4), mac_test(4),
     mac(9)

HISTORY

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

AUTHORS

     This software was contributed to the FreeBSD 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 FreeBSD.

     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.

BSD
								  October 6, 2005							       BSD
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