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.\" Copyright (c) 2003-2005 Kungliga Tekniska Högskolan
.\" (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: krb5_kuserok.3 15083 2005-05-04 12:11:22Z joda $
.\"
.Dd May 4, 2005
.Dt KRB5_KUSEROK 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_kuserok
.Nd "checks if a principal is permitted to login as a user"
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.In krb5.h
.Ft krb5_boolean
.Fo krb5_kuserok
.Fa "krb5_context context"
.Fa "krb5_principal principal"
.Fa "const char *user"
.Fc
.Sh DESCRIPTION
This function takes the name of a local
.Fa user
and checks if
.Fa principal
is allowed to log in as that user.
.Pp
The
.Fa user
may have a
.Pa ~/.k5login
file listing principals that are allowed to login as that user. If
that file does not exist, all principals with a first component
identical to the username, and a realm considered local, are allowed
access.
.Pp
The
.Pa .k5login
file must contain one principal per line, be owned by
.Fa user ,
and not be writable by group or other (but must be readable by
anyone).
.Pp
Note that if the file exists, no implicit access rights are given to
.Fa user Ns @ Ns Aq localrealm .
.Pp
Optionally, a set of files may be put in
.Pa ~/.k5login.d ( Ns
a directory), in which case they will all be checked in the same
manner as
.Pa .k5login .
The files may be called anything, but files starting with a hash
.Dq ( # ) ,
or ending with a tilde
.Dq ( ~ )
are ignored. Subdirectories are not traversed. Note that this
directory may not be checked by other implementations.
.Sh RETURN VALUES
.Nm
returns
.Dv TRUE
if access should be granted,
.Dv FALSE
otherwise.
.Sh HISTORY
The
.Pa ~/.k5login.d
feature appeared in Heimdal 0.7.
.Sh SEE ALSO
.Xr krb5_get_default_realms 3 ,
.Xr krb5_verify_user 3 ,
.Xr krb5_verify_user_lrealm 3 ,
.Xr krb5_verify_user_opt 3 ,
.Xr krb5.conf 5
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