freebsd-dev/lib/libc/posix1e/mac_get.3

.\" 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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.Dd December 21, 2001
.Dt MAC_GET 3
.Os
.Sh NAME
.Nm mac_get_file ,
.Nm mac_get_fd ,
.Nm mac_get_proc
.Nd get the label of a file, socket, socket peer or process
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/mac.h
.Ft int
.Fn mac_get_file "const char *path" "mac_t label"
.Ft int
.Fn mac_get_fd "int fd" "mac_t label"
.Ft int
.Fn mac_get_pid "pid_t pid" "mac_t label"
.Ft int
.Fn mac_get_proc "mac_t label"
.Sh DESCRIPTION
The
.Fn mac_get_file
and
.Fn mac_get_fd
functions fill in
.Fa label
(which must first be allocated by
.Xr mac_prepare 3 )
with the MAC label associated with the file referenced by
.Fa path
or the file descriptor specified by
.Fa fd ,
respectively.
Note that this function will fail on socket descriptors.
For information on
getting MAC labels on socket descriptors see
.Xr getsockopt 2 .
.Pp
The
.Fn mac_get_proc
and
.Fn mac_get_pid
functions fill in
.Fa label
(which must first be allocated by
.Xr mac_prepare 3 )
with the MAC label associated
with the requesting process
or the specified process, respectively.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EACCES
A component of
.Fa path
is not searchable,
or MAC read access to the file
is denied.
.It Bq Er ENAMETOOLONG
The pathname pointed to by
.Fa path
exceeds
.Dv PATH_MAX ,
or a component of the pathname exceeds
.Dv NAME_MAX .
.It Bq Er ENOENT
A component of
.Fa path
does not exist.
.It Bq Er ENOMEM
Insufficient memory is available
to allocate a new MAC label structure.
.It Bq Er ENOTDIR
A component of
.Fa path
is not a directory.
.El
.Sh SEE ALSO
.Xr mac 3 ,
.Xr mac_free 3 ,
.Xr mac_prepare 3 ,
.Xr mac_set 3 ,
.Xr mac_text 3 ,
.Xr mac 4 ,
.Xr mac 9
.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.
.Sh HISTORY
Support for Mandatory Access Control was introduced in
.Fx 5.0
as part of the
.Tn TrustedBSD
Project.