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MAC.CONF (5) | | Unix Manual Pages | :man


mac.conf - format of the MAC library configuration file


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The mac.conf file configures the default label elements to be used by policy-agnostic applications that operate on MAC labels. A file contains a series of default label sets specified by object class, in addition to blank lines and comments preceded by a ‘#’ symbol.

Currently, the implementation supports two syntax styles for label element declaration. The old (deprecated) syntax consists of a single line with two fields separated by white space: the object class name, and a list of label elements as used by the mac_prepare(3) library calls prior to an application invocation of a function from mac_get(3).

The newer more preferred syntax consists of three fields separated by white space: the label group, object class name and a list of label elements.

Label element names may optionally begin with a ‘?’ symbol to indicate that a failure to retrieve the label element for an object should be silently ignored, and improves usability if the set of MAC policies may change over time.


/etc/mac.conf MAC library configuration file.


The following example configures user applications to operate with four MAC policies: mac_biba(4), mac_mls(4), SEBSD, and mac_partition(4).
# Default label set to be used by simple MAC applications

default_labels file ?biba,?lomac,?mls,?sebsd
default_labels ifnet ?biba,?lomac,?mls,?sebsd
default_labels process ?biba,?lomac,?mls,?partition,?sebsd
default_labels socket ?biba,?lomac,?mls

# Deprecated (old) syntax

default_file_labels ?biba,?mls,?sebsd
default_ifnet_labels ?biba,?mls,?sebsd
default_process_labels ?biba,?mls,partition,?sebsd

In this example, userland applications will attempt to retrieve Biba, MLS, and SEBSD labels for all object classes; for processes, they will additionally attempt to retrieve a Partition identifier. In all cases except the Partition identifier, failure to retrieve a label due to the respective policy not being present will be ignored.


mac(3), mac_get(3), mac_prepare(3), mac(4), mac(9)




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