920325ee1d
SO_PEERLABEL. This provides an interface to query the label of a socket peer without embedding implementation details of mac_t in the application. Previously, sizeof(*mac_t) had to be specified by an application when performing getsockopt(). Document mac_get_peer(3), and expand documentation of the other mac_get(3) functions. Note that it's possible to get EINVAL back from mac_get_fd(3) when pointing it at an inappropriate object. NOTE: mac_get_fd() and mac_set_fd() support for sockets will follow shortly, so the documentation is slightly ahead of the code. Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
142 lines
4.2 KiB
Groff
142 lines
4.2 KiB
Groff
.\" 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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.\"
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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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.\"
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.Dd December 21, 2001
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.Dt MAC_GET 3
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.Os
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.Sh NAME
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.Nm mac_get_file ,
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.Nm mac_get_fd ,
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.Nm mac_get_proc
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.Nd get the label of a file, socket, socket peer or process
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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 int
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.Fn mac_get_file "const char *path" "mac_t label"
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.Ft int
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.Fn mac_get_fd "int fd" "mac_t label"
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.Ft int
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.Fn mac_get_peer "int fd" "mac_t label"
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.Ft int
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.Fn mac_get_pid "pid_t pid" "mac_t label"
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.Ft int
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.Fn mac_get_proc "mac_t label"
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.Sh DESCRIPTION
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The
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.Fn mac_get_file
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system call returns the label associated with a file specified by
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pathname.
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.Pp
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The
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.Fn mac_get_fd
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system call returns the label associated with an object referenced by
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the specified file descriptor.
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Note that in the case of a file system socket, the label returned will
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be the socket label, which may be different from the label of the
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on-disk node acting as a rendezvous for the socket.
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The
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.Fn mac_get_peer
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system call returns the label associated with the remote endpoint of
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a socket; the exact semantics of this call will depend on the protocol
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domain, communications type, and endpoint; typically this label will
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be cached when a connection-oriented protocol instance is first set up,
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and is undefined for datagram protocols.
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.Pp
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The
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.Fn mac_get_pid
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and
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.Fn mac_get_proc
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system calls return the process label associated with an arbitrary
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process id, or the current process.
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.Pp
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Label storage for use with these calls must first be allocated and
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prepared using the
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.Xr mac_prepare 3
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functions.
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When an application is done using a label, the memory may be returned
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using
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.Xr mac_free 3 .
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EACCES
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A component of
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.Fa path
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is not searchable,
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or MAC read access to the file
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is denied.
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.It Bq Er EINVAL
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The requested label operation is not valid for the object referenced by
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.Fa fd .
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.It Bq Er ENAMETOOLONG
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The pathname pointed to by
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.Fa path
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exceeds
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.Dv PATH_MAX ,
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or a component of the pathname exceeds
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.Dv NAME_MAX .
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.It Bq Er ENOENT
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A component of
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.Fa path
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does not exist.
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.It Bq Er ENOMEM
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Insufficient memory is available
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to allocate a new MAC label structure.
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.It Bq Er ENOTDIR
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A component of
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.Fa path
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is not a directory.
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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_prepare 3 ,
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.Xr mac_set 3 ,
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.Xr mac_text 3 ,
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.Xr mac 4 ,
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.Xr mac 9
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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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.Sh HISTORY
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Support for Mandatory Access Control was introduced in
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.Fx 5.0
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as part of the
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.Tn TrustedBSD
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Project.
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