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MAC(3)		       FreeBSD Library Functions Manual			MAC(3)

NAME
     mac -- introduction to the	MAC security API

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/mac.h>

     In	the kernel configuration file:
     options MAC

DESCRIPTION
     FreeBSD permits administrators to define Mandatory	Access Control labels
     defining levels for the privacy and integrity of data, overriding discre-
     tionary policies for those	objects.  Not all objects currently provide
     support for MAC labels, and MAC support must be explicitly	enabled	by the
     administrator.  The library calls include routines	to retrieve, dupli-
     cate, and set MAC labels associated with files and	processes.

     POSIX.1e describes	a set of MAC manipulation routines to manage the con-
     tents of MAC labels, as well as their relationships with files and	pro-
     cesses; almost all	of these support routines are implemented in FreeBSD.

     Available functions, sorted by behavior, include:

     mac_get_fd()
	     This function is described	in mac_get(3), and may be used to
	     retrieve the MAC label associated with a specific file descrip-
	     tor.

     mac_get_file()
	     This function is described	in mac_get(3), and may be used to
	     retrieve the MAC label associated with a named file.

     mac_get_proc()
	     This function is described	in mac_get(3), and may be used to
	     retrieve the MAC label associated with the	calling	process.

     mac_set_fd()
	     This function is described	in mac_set(3), and may be used to set
	     the MAC label associated with a specific file descriptor.

     mac_set_file()
	     This function is described	in mac_set(3), and may be used to set
	     the MAC label associated with a named file.

     mac_set_proc()
	     This function is described	in mac_set(3), and may be used to set
	     the MAC label associated with the calling process.

     mac_free()
	     This function is described	in mac_free(3),	and may	be used	to
	     free userland working MAC label storage.

     mac_from_text()
	     This function is described	in mac_text(3),	and may	be used	to
	     convert a text-form MAC label into	a working mac_t.

     mac_prepare()

     mac_prepare_file_label()

     mac_prepare_ifnet_label()

     mac_prepare_process_label()
	     These functions are described in mac_prepare(3), and may be used
	     to	preallocate storage for	MAC label retrieval.  mac_prepare(3)
	     prepares a	label based on caller-specified	label names; the other
	     calls rely	on the default configuration specified in mac.conf(5).

     mac_to_text()
	     This function is described	in mac_text(3),	and may	be used	to
	     convert a mac_t into a text-form MAC label.
     The behavior of some of these calls is influenced by the configuration
     settings found in mac.conf(5), the	MAC library run-time configuration
     file.

IMPLEMENTATION NOTES
     FreeBSD's support for POSIX.1e interfaces and features is currently under
     development.

FILES
     /etc/mac.conf  MAC	library	configuration file, documented in mac.conf(5).
		    Provides default behavior for applications aware of	MAC
		    labels on system objects, but without policy-specific
		    knowledge.

SEE ALSO
     mac_free(3), mac_get(3), mac_prepare(3), mac_set(3), mac_text(3), mac(4),
     mac.conf(5), mac(9)

STANDARDS
     These APIs	are loosely based on the APIs described	in POSIX.1e.  POSIX.1e
     is	described in IEEE POSIX.1e draft 17.  Discussion of the	draft contin-
     ues on the	cross-platform POSIX.1e	implementation mailing list.  To join
     this list,	see the	FreeBSD	POSIX.1e implementation	page for more informa-
     tion.  However, the resemblence of	these APIs to the POSIX	APIs is	only
     loose, as the POSIX APIs were unable to express many notions required for
     flexible and extensible access control.

HISTORY
     Support for Mandatory Access Control was introduced in FreeBSD 5.0	as
     part of the TrustedBSD Project.

BUGS
     The TrustedBSD MAC	Framework and associated policies, interfaces, and
     applications are considered to be an experimental feature in FreeBSD.
     Sites considering production deployment should keep the experimental sta-
     tus of these services in mind during any deployment process.  See also
     mac(9) for	related	considerations regarding the kernel framework.

FreeBSD	10.1			April 19, 2003			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | FILES | SEE ALSO | STANDARDS | HISTORY | BUGS

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