Manual Reference Pages - MAC_BSDEXTENDED (4)
- file system firewall policy
To compile the file system firewall policy into your kernel,
place the following lines in your kernel configuration file:
.Cd options MAC
.Cd options MAC_BSDEXTENDED
Alternately, to load the file system firewall policy module at boot time,
place the following line in your kernel configuration file:
.Cd options MAC
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
or some other tool utilizing
where they are stored internally
and used to determine whether to allow or deny specific accesses
While the traditional
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 particular access
or the end of the list is reached.
policy works similar to
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.
The following sysctls may be used to tweak the behavior of
Set to zero or one to toggle the policy off or on.
List the number of defined rules, the maximum rule count is
current set at 256.
List the number of rule slots currently being used.
Toggle between the old all rules match functionality
and the new first rule matches functionality.
This is enabled by default.
Log all access violations via the
Currently does nothing interesting.
policy module first appeared in
and was developed by the
The "match first case" and logging capabilities were later added by
.An Tom Rhodes Aq trhodes@FreeBSD.org .
This software was contributed to the
Project by NAI Labs, the Security Research Division of Network Associates
Inc. under DARPA/SPAWAR contract N66001-01-C-8035
as part of the DARPA CHATS research program.
Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.