170 lines
4.3 KiB
Groff
170 lines
4.3 KiB
Groff
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.\" Copyright (c) 2001 Networks Associates Technology, Inc.
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project by Chris
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.\" Costello at Safeport Network Services and NAI Labs, the Security
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.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
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.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
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.\" research program.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd December 21, 2001
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.Dt MAC_TEXT 3
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.Sh NAME
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.Nm mac_from_text ,
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.Nm mac_to_text
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.Nd convert MAC label to/from text representation
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mac.h
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.Ft mac_t
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.Fn mac_from_text "const char *text_p"
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.Ft "char *"
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.Fn mac_to_text "mac_t label" "size_t *len_p"
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.Sh DESCRIPTION
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The
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.Fn mac_from_text
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function converts the text representation of a label
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into a
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.Vt mac_t ,
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which must later be freed with
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.Xr mac_free .
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The
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.Fn mac_to_text
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function returns
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the text representation of
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.Fa label
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and sets
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.Fa *len_p
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to the length of the returned string.
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.Pp
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.Fx
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uses the following format
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for MAC policy text representations:
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.Pp
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.Dl Sy policy Ns No / Ns Sy qualifier
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.Pp
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Where
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.Sy policy
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can be one of
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.Dq biba ,
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.Dq mls ,
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or
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.Dq te .
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.Pp
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Valid labels can have the following arguments for
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.Sy qualifier ,
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depending on the value of
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.Sy policy .
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.Bl -tag -width "Policy" -offset indent
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.It Em Policy
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.Em Qualifier
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.It biba
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.Dq high ,
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.Dq low ,
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.Dq equal ,
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or a numeric grade.
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.It mls
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.Dq high ,
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.Dq low ,
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.Dq equal ,
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or a numeric level.
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.It te
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Types for
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.Dq te
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consist of a type name which must
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neither be empty nor exceed the length limit for the label.
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.El
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.Pp
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All policies must be present
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in a comma-separated list,
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but may be in any order
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(see
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.Sx EXAMPLES ) .
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.Sh RETURN VALUES
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The
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.Fn mac_from_text
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function returns a valid
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.Vt mac_t
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equivalent to
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the MAC label described in
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.Fa text_p
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upon success, and
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.Dv NULL
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upon failure, setting
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.Va errno
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to indicate the error.
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.Pp
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The
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.Fn mac_to_text
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function returns a string
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containing the text representation of
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.Fa label
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upon success, and
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.Dv NULL
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upon failure, setting
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.Va errno
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to indicate the error.
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.Sh EXAMPLES
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The following are valid MAC labels:
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.Bd -literal -offset indent
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biba/high,mls/low,te/none
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biba/low,mls/low,te/none
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biba/low,mls/3,te/none
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.Ed
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.Sh COMPATIBILITY
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POSIX.1e does not define
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a text format for text representations
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of MAC labels.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EINVAL
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An invalid policy or qualifier
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was specified in
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.Fa text_p ,
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or an invalid MAC label
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was specified in
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.Fa label .
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.It Bq Er ENOMEM
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Insufficient memory was available
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to allocate internal storage.
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.El
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.Sh SEE ALSO
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.Xr mac 3 ,
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.Xr mac_free 3 ,
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.Xr mac_get 3 ,
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.Xr mac_set 3
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.Sh STANDARDS
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POSIX.1e is described in IEEE POSIX.1e draft 17.
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Discussion of the draft
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continues on the cross-platform POSIX.1e implementation mailing list.
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To join this list, see the
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.Fx
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POSIX.1e implementation page
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for more information.
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