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.\" $Id$
.\"
.\" Copyright (c) 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.
.\"
.Dd May 24, 2005
.Dt IPROP 8
.Os
.Sh NAME
.Nm iprop ,
.Nm ipropd-master ,
.Nm ipropd-slave
.Nd propagate transactions from a Heimdal Kerberos master KDC to slave KDCs
.Sh SYNOPSIS
.Nm ipropd-master
.Oo Fl c Ar string \*(Ba Xo
.Fl Fl config-file= Ns Ar string
.Xc
.Oc
.Oo Fl r Ar string \*(Ba Xo
.Fl Fl realm= Ns Ar string
.Xc
.Oc
.Oo Fl k Ar kspec \*(Ba Xo
.Fl Fl keytab= Ns Ar kspec
.Xc
.Oc
.Oo Fl d Ar file \*(Ba Xo
.Fl Fl database= Ns Ar file
.Xc
.Oc
.Op Fl Fl slave-stats-file= Ns Ar file
.Op Fl Fl time-missing= Ns Ar time
.Op Fl Fl time-gone= Ns Ar time
.Op Fl Fl detach
.Op Fl Fl version
.Op Fl Fl help
.Nm ipropd-slave
.Oo Fl c Ar string \*(Ba Xo Fl Fl config-file= Ns Ar string Xc Oc
.Oo Fl r Ar string \*(Ba Xo Fl Fl realm= Ns Ar string Xc Oc
.Oo Fl d Ar file \*(Ba Xo Fl Fl database= Ns Ar file Xc Oc
.Oo Fl k Ar kspec \*(Ba Xo Fl Fl keytab= Ns Ar kspec Xc Oc
.Op Fl Fl statusfile= Ns Ar file
.Op Fl Fl hostname= Ns Ar hostname
.Op Fl Fl port= Ns Ar port
.Op Fl Fl time-lost= Ns Ar time
.Op Fl Fl async-hdb
.Op Fl Fl detach
.Op Fl Fl version
.Op Fl Fl help
.Ar master
.Sh DESCRIPTION
.Nm ipropd-master
is used to propagate changes to a Heimdal Kerberos database from the
master Kerberos server on which it runs to slave Kerberos servers
running
.Nm ipropd-slave .
.Pp
The slaves are specified by the contents of the
.Pa slaves
file in the KDC's database directory, e.g.\&
.Pa /var/heimdal/slaves .
This has principals one per-line of the form
.Dl iprop/ Ns Ar slave Ns @ Ns Ar REALM
where
.Ar slave
is the hostname of the slave server in the given
.Ar REALM ,
e.g.\&
.Dl iprop/kerberos-1.example.com@EXAMPLE.COM
On a slave, the argument
.Fa master
specifies the hostname of the master server from which to receive updates.
.Pp
In contrast to
.Xr hprop 8 ,
which sends the whole database to the slaves regularly,
.Nm
normally sends only the changes as they happen on the master.
The master keeps track of all the changes by assigning a version
number to every transaction to the database.
The slaves know which was the latest version they saw, and in this
way it can be determined if they are in sync or not.
A log of all the transactions is kept on the master.
When a slave is at an older version than the oldest one in the log,
the whole database has to be sent.
.Pp
The log of transactions is also used to implement a two-phase commit
(with roll-forward for recovery) method of updating the HDB.
Transactions are first recorded in the log, then in the HDB, then
the log is updated to mark the transaction as committed.
.Pp
The changes are propagated over a secure channel (on port 2121 by
default).
This should normally be defined as
.Dq iprop/tcp
in
.Pa /etc/services
or another source of the services database.
The master and slaves
must each have access to a keytab with keys for the
.Nm iprop
service principal on the local host.
.Pp
There is a keep-alive feature logged in the master's
.Pa slave-stats
file (e.g.\&
.Pa /var/heimdal/slave-stats ) .
.Pp
Note that hierarchical replication is supported by running
an
.Nm ipropd-master
on the same KDC as an
.Nm ipropd-slave .
.Pp
Supported options for
.Nm ipropd-master :
.Bl -tag -width Ds
.It Fl c Ar string , Fl Fl config-file= Ns Ar string
.It Fl r Ar string , Fl Fl realm= Ns Ar string
.It Fl k Ar kspec , Fl Fl keytab= Ns Ar kspec
Keytab for authenticating
.Nm ipropd-slave
clients.
.It Fl d Ar file , Fl Fl database= Ns Ar file
Database (default per KDC)
.It Fl Fl slave-stats-file= Ns Ar file
File for slave status information.
.It Fl Fl time-missing= Ns Ar time
Time before slave is polled for presence (default 2 min).
.It Fl Fl time-gone= Ns Ar time
Time of inactivity after which a slave is considered gone (default 5 min).
.It Fl Fl detach
Detach from console.
.It Fl Fl version
.It Fl Fl help
.El
.Pp
Supported options for
.Nm ipropd-slave :
.Bl -tag -width Ds
.It Fl c Ar string , Fl Fl config-file= Ns Ar string
.It Fl r Ar string , Fl Fl realm= Ns Ar string
.It Fl d Ar file , Fl Fl database= Ns Ar file
Database (default per KDC)
.It Fl k Ar kspec , Fl Fl keytab= Ns Ar kspec
Keytab with client credentials for authenticating to
.Nm ipropd-master .
.It Fl Fl status-file= Ns Ar file
.It Fl Fl hostname= Ns Ar hostname
Hostname for client principal if different from actual hostname.
.It Fl Fl port= Ns Ar port
.It Fl Fl time-lost= Ns Ar time
time before server is considered lost (default 5 min)
.It Fl Fl async-hdb
Use asynchronous writes.
This is very useful for very busy sites or sites with very large
HDBs.
.It Fl Fl detach
Detach from console.
.It Fl Fl version
.It Fl Fl help
.El
Time arguments for the relevant options above may be specified in forms
like 5 min, 300 s, or simply a number of seconds.
.Sh FILES
.Pa slaves ,
.Pa slave-stats
in the database directory.
.Pa ipropd-master.pid ,
.Pa ipropd-slave.pid
in the database directory, or in the directory named by the
.Ev HEIM_PIDFILE_DIR
environment variable.
.Sh SEE ALSO
.Xr krb5.conf 5 ,
.Xr hprop 8 ,
.Xr hpropd 8 ,
.Xr iprop-log 8 ,
.Xr kdc 8 .
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