Manual Pages  — MAC_BSDEXTENDED

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"

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)).

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 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.

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)