xref: /freebsd/lib/libc/posix1e/mac_text.3 (revision d97fcfce273eb3bc3984441c9e4bcbd5231fb1f5)

.\" Copyright (c) 2001 Networks Associates Technology, Inc.
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.\" This software was developed for the FreeBSD Project by Chris
.\" Costello at Safeport Network Services and 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.
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.\" $FreeBSD$
.Dd December 21, 2001
.Dt MAC_TEXT 3
.Sh NAME
.Nm mac_from_text ,
.Nm mac_to_text
.Nd convert MAC label to/from text representation
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/mac.h
.Ft mac_t
.Fn mac_from_text "const char *text_p"
.Ft "char *"
.Fn mac_to_text "mac_t label" "size_t *len_p"
.Sh DESCRIPTION
The
.Fn mac_from_text
function converts the text representation of a label
into a
.Vt mac_t ,
which must later be freed with
.Xr mac_free .
The
.Fn mac_to_text
function returns
the text representation of
.Fa label
and sets
.Fa *len_p
to the length of the returned string.
.Pp
.Fx
uses the following format
for MAC policy text representations:
.Pp
.Dl Sy policy Ns No / Ns Sy qualifier
.Pp
Where
.Sy policy
can be one of
.Dq biba ,
.Dq mls ,
or
.Dq te .
.Pp
Valid labels can have the following arguments for
.Sy qualifier ,
depending on the value of
.Sy policy .
.Bl -tag -width "Policy" -offset indent
.It Em Policy
.Em Qualifier
.It biba
.Dq high ,
.Dq low ,
.Dq equal ,
or a numeric grade.
.It mls
.Dq high ,
.Dq low ,
.Dq equal ,
or a numeric level.
.It te
Types for
.Dq te
consist of a type name which must
neither be empty nor exceed the length limit for the label.
.El
.Pp
All policies must be present
in a comma-separated list,
but may be in any order
(see
.Sx EXAMPLES ) .
.Sh RETURN VALUES
The
.Fn mac_from_text
function returns a valid
.Vt mac_t
equivalent to
the MAC label described in
.Fa text_p
upon success, and
.Dv NULL
upon failure, setting
.Va errno
to indicate the error.
.Pp
The
.Fn mac_to_text
function returns a string
containing the text representation of
.Fa label
upon success, and
.Dv NULL
upon failure, setting
.Va errno
to indicate the error.
.Sh EXAMPLES
The following are valid MAC labels:
.Bd -literal -offset indent
biba/high,mls/low,te/none
biba/low,mls/low,te/none
biba/low,mls/3,te/none
.Ed
.Sh COMPATIBILITY
POSIX.1e does not define
a text format for text representations
of MAC labels.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINVAL
An invalid policy or qualifier
was specified in
.Fa text_p ,
or an invalid MAC label
was specified in
.Fa label .
.It Bq Er ENOMEM
Insufficient memory was available
to allocate internal storage.
.El
.Sh SEE ALSO
.Xr mac 3 ,
.Xr mac_free 3 ,
.Xr mac_get 3 ,
.Xr mac_set 3
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
Discussion of the draft
continues on the cross-platform POSIX.1e implementation mailing list.
To join this list, see the
.Fx
POSIX.1e implementation page
for more information.