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manpage for krb5_aname_to_localname

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Love Hörnquist Åstrand
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.\" Copyright (c) 2003 Kungliga Tekniska H<>gskolan
.\" (Royal Institute of Technology, Stockholm, Sweden).
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. 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.
.\"
.\" 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
.\"
.\" $Id$
.\"
.Dd March 17, 2003
.Dt KRB5_ANAME_TO_LOCALNAME 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_aname_to_localname
.Nd converts a principal to a system local name.
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.Fd #include <krb5.h>
.Ft krb5_boolean
.Fo krb5_aname_to_localname
.Fa "krb5_context context"
.Fa "krb5_const_principal name"
.Fa "size_t lnsize"
.Fa "char *lname"
.Fc
.Sh DESCRIPTION
This function takes a principal
.Fa name ,
verifies its in the local realm (using
.Fn krb5_get_default_realms )
and then returns the local name of the principal.
.Pp
If
.Fa name
isn't in one of the local realms and error is returned.
.Pp
If size
.Fa ( lnsize )
of the local name
.Fa ( lname )
is to small, an error is returned.
.Pp
.Fn krb5_aname_to_localname
should only be use by application that implements protocols that
doesn't transport the login name and thus needs to convert a principal
to a local name.
.Pp
Protocols should be designed so that the it autheticates using
Kerberos, send over the login name and then verifies in the principal
that authenticated is allowed to login and the login name.
A way to check if a user is allowed to login is using the function
.Fn krb5_kuserok .
.Sh SEE ALSO
.Xr krb5_get_default_realms 3 ,
.Xr krb5_kuserok 3