.\"	$OpenBSD: rpcauth.3,v 1.15 2010/09/07 19:52:37 schwarze Exp $
.\" Mostly converted to mandoc by Theo de Raadt, Tue Feb 24 04:04:46 MST 1998
.\"
.\" Copyright (c) 2010, Oracle America, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\"
.\"     * Redistributions of source code must retain the above copyright
.\"       notice, this list of conditions and the following disclaimer.
.\"     * Redistributions in binary form must reproduce the above
.\"       copyright notice, this list of conditions and the following
.\"       disclaimer in the documentation and/or other materials
.\"       provided with the distribution.
.\"     * Neither the name of the "Oracle America, Inc." nor the names of its
.\"       contributors may be used to endorse or promote products derived
.\"       from this software without specific prior written permission.
.\"
.\"   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
.\"   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
.\"   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
.\"   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
.\"   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
.\"   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\"   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
.\"   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\"   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\"   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
.\"   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
.\"   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: September 7 2010 $
.Dt RPC 3
.Os
.Sh NAME
.Nm auth_destroy ,
.Nm authnone_create ,
.Nm authunix_create ,
.Nm authunix_create_default
.Nd library routines for remote procedure calls
.Sh SYNOPSIS
.Fd #include <rpc/rpc.h>
.Ft void
.Fn auth_destroy "AUTH *auth"
.Ft AUTH *
.Fn authnone_create "void"
.Ft AUTH *
.Fn authunix_create "char *host" "int uid" "int gid" "int len" "int *aup.gids"
.Ft AUTH *
.Fn authunix_create_default "void"
.Ft void
.Fn set_rpc_maxgrouplist "int num"
.Sh DESCRIPTION
These routines establish authentication information for use by the
RPC functions described in
.Xr rpc 3 .
.Pp
.Fn auth_destroy
is a macro that destroys the authentication information associated with
.Fa auth .
Destruction usually involves deallocation of private data structures.
The use of
.Fa auth
is undefined after calling
.Fn auth_destroy .
.Pp
.Fn authnone_create
creates and returns an RPC
authentication handle that passes nonusable authentication
information with each remote procedure call.
This is the default authentication used by RPC.
.Pp
.Fn authunix_create
creates and returns an RPC authentication handle that contains
.Ux
authentication information.
The parameter
.Fa host
is the name of the machine on which the information was
created;
.Fa uid
is the user's user ID;
.Fa gid
is the user's current group ID;
.Fa len
and
.Fa aup_gids
refer to a counted array of groups to which the user belongs.
It is easy to impersonate a user.
.Pp
.Fn authunix_create_default
calls
.Fn authunix_create
with the appropriate parameters.
.Pp
.Fn set_rpc_maxgrouplist
allows the application to set the maximum size of the group list that
will be used in
.Fn authunix_create_default
to
.Fa num .
Some servers will refuse mounts if the group list is larger than it
expects (like 8).
.Sh SEE ALSO
.\"Xr rpc_secure 3 ,
.Xr rpcgen 1 ,
.Xr select 2 ,
.Xr getrpcport 3 ,
.Xr rpc 3 ,
.Xr xdr 3 ,
.Xr rpc 5 ,
.Xr portmap 8
.Rs
.%T "Remote Procedure Calls: Protocol Specification"
.Re
.Rs
.%T "Remote Procedure Call Programming Guide"
.Re
.Rs
.%T "rpcgen Programming Guide"
.Re
.Rs
.%A "Sun Microsystems, Inc."
.%T "RPC: Remote Procedure Call Protocol Specification"
.%R "RFC 1057, USC-ISI"
.Re