This is krb5-admin.info, produced by makeinfo version 4.6 from
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INFO-DIR-SECTION Kerberos V5
START-INFO-DIR-ENTRY
* Admin Guide: (krb5-admin).            Kerberos V5 System Admin's Guide
END-INFO-DIR-ENTRY



File: krb5-admin.info,  Node: Top,  Next: Copyright,  Prev: (dir),  Up: (dir)

This document describes how to administrate a Kerberos V5 installation.

* Menu:

* Copyright::
* Introduction::
* How Kerberos Works::
* Configuration Files::
* Using DNS::
* Administrating the Kerberos Database::
* Application Servers::
* Backups of Secure Hosts::
* Bug Reporting::
* Appendix::


File: krb5-admin.info,  Node: Copyright,  Next: Introduction,  Prev: Top,  Up: Top

Copyright
*********

Copyright (C) 1985-2002 by the Massachusetts Institute of Technology.

     Export of software employing encryption from the United States of
     America may require a specific license from the United States
     Government.  It is the responsibility of any person or organization
     contemplating export to obtain such a license before exporting.

WITHIN THAT CONSTRAINT, permission to use, copy, modify, and distribute
this software and its documentation for any purpose and without fee is
hereby granted, provided that the above copyright notice appear in all
copies and that both that copyright notice and this permission notice
appear in supporting documentation, and that the name of M.I.T. not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  Furthermore if you
modify this software you must label your software as modified software
and not distribute it in such a fashion that it might be confused with
the original MIT software.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.

The following copyright and permission notice applies to the OpenVision
Kerberos Administration system located in kadmin/create, kadmin/dbutil,
kadmin/passwd, kadmin/server, lib/kadm5, and portions of lib/rpc:

     Copyright, OpenVision Technologies, Inc., 1996, All Rights Reserved

     WARNING:  Retrieving the OpenVision Kerberos Administration system
     source code, as described below, indicates your acceptance of the
     following terms.  If you do not agree to the following terms, do
     not retrieve the OpenVision Kerberos administration system.

     You may freely use and distribute the Source Code and Object Code
     compiled from it, with or without modification, but this Source
     Code is provided to you "AS IS" EXCLUSIVE OF ANY WARRANTY,
     INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY
     OR FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER WARRANTY,
     WHETHER EXPRESS OR IMPLIED.  IN NO EVENT WILL OPENVISION HAVE ANY
     LIABILITY FOR ANY LOST PROFITS, LOSS OF DATA OR COSTS OF
     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY SPECIAL,
     INDIRECT, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT,
     INCLUDING, WITHOUT LIMITATION, THOSE RESULTING FROM THE USE OF THE
     SOURCE CODE, OR THE FAILURE OF THE SOURCE CODE TO PERFORM, OR FOR
     ANY OTHER REASON.

     OpenVision retains all copyrights in the donated Source Code.
     OpenVision also retains copyright to derivative works of the
     Source Code, whether created by OpenVision or by a third party.
     The OpenVision copyright notice must be preserved if derivative
     works are made based on the donated Source Code.

     OpenVision Technologies, Inc. has donated this Kerberos
     Administration system to MIT for inclusion in the standard
     Kerberos 5 distribution.  This donation underscores our commitment
     to continuing Kerberos technology development and our gratitude
     for the valuable work which has been performed by MIT and the
     Kerberos community.

The implementation of the Yarrow pseudo-random number generator in
src/lib/crypto/yarrow has the following copyright:

     Copyright 2000 by Zero-Knowledge Systems, Inc.

     Permission to use, copy, modify, distribute, and sell this software
     and its documentation for any purpose is hereby granted without
     fee, provided that the above copyright notice appear in all copies
     and that both that copyright notice and this permission notice
     appear in supporting documentation, and that the name of
     Zero-Knowledge Systems, Inc. not be used in advertising or
     publicity pertaining to distribution of the software without
     specific, written prior permission.  Zero-Knowledge Systems, Inc.
     makes no representations about the suitability of this software
     for any purpose.  It is provided "as is" without express or
     implied warranty.

     ZERO-KNOWLEDGE SYSTEMS, INC. DISCLAIMS ALL WARRANTIES WITH REGARD
     TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
     MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL ZERO-KNOWLEDGE
     SYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
     DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
     OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
     TORTUOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
     PERFORMANCE OF THIS SOFTWARE.


The implementation of the AES encryption algorithm in
src/lib/crypto/aes has the following copyright:

     Copyright (c) 2001, Dr Brian Gladman <brg@gladman.uk.net>,
     Worcester, UK.  All rights reserved.

     LICENSE TERMS

     The free distribution and use of this software in both source and
     binary form is allowed (with or without changes) provided that:

       1. distributions of this source code include the above copyright
          notice, this list of conditions and the following disclaimer;

       2. distributions in binary form include the above copyright
          notice, this list of conditions and the following disclaimer
          in the documentation and/or other associated materials;

       3. the copyright holder's name is not used to endorse products
          built using this software without specific written permission.

     DISCLAIMER

     This software is provided 'as is' with no explcit or implied
     warranties in respect of any properties, including, but not
     limited to, correctness and fitness for purpose.


Kerberos V5 includes documentation and software developed at the
University of California at Berkeley, which includes this copyright
notice:

Copyright (C) 1983 Regents of the University of California.
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. All advertising materials mentioning features or use of this
     software must display the following acknowledgement:

          This product includes software developed by the University of
          California, Berkeley and its contributors.

  4. Neither the name of the University nor the names of its
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.

Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notices and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided also that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Permission is granted to copy and distribute translations of this manual
into another language, under the above conditions for modified versions.


File: krb5-admin.info,  Node: Introduction,  Next: How Kerberos Works,  Prev: Copyright,  Up: Top

Introduction
************

* Menu:

* Why Should I use Kerberos?::
* Documentation for Kerberos V5::
* Overview of This Guide::


File: krb5-admin.info,  Node: Why Should I use Kerberos?,  Next: Documentation for Kerberos V5,  Prev: Introduction,  Up: Introduction

Why Should I use Kerberos?
==========================

Since Kerberos negotiates authenticated, and optionally encrypted,
communications between two points anywhere on the internet, it provides
a layer of security that is not dependent on which side of a firewall
either client is on.  Since studies have shown that half of the computer
security breaches in industry happen from inside firewalls, Kerberos V5
from MIT will play a vital role in the security of your network.


File: krb5-admin.info,  Node: Documentation for Kerberos V5,  Next: Overview of This Guide,  Prev: Why Should I use Kerberos?,  Up: Introduction

Documentation for Kerberos V5
=============================

This document is one piece of the document set for Kerberos V5.  The
documents, and their intended audiences, are:

   * Kerberos V5 Installation Guide:  a concise guide for installing
     Kerberos V5.  Kerberos administrators (particularly whoever will be
     making site-wide decisions about the installation) and the system
     administrators who will be installing the software should read this
     guide.

   * Kerberos V5 System Administrator's Guide:  a sysadmin's guide to
     administering a Kerberos installation.  The System Administrator's
     Guide describes the administration software and suggests policies
     and procedures for administering a Kerberos installation.  Anyone
     who will have administrative access to your Kerberos database
     should read this guide.

   * Kerberos V5 UNIX User's Guide:  a guide to using the Kerberos UNIX
     client programs.  All users on UNIX systems should read this guide,
     particularly the "Tutorial" section.


File: krb5-admin.info,  Node: Overview of This Guide,  Prev: Documentation for Kerberos V5,  Up: Introduction

Overview of This Guide
======================

The next chapter describes how Kerberos works.

Chapter three describes administration of the principals in the Kerberos
database.

Chapter four describes how you can use DNS in configuring your Kerberos
realm.

Chapter five describes administrative programs for manipulating the
Kerberos database as a whole.

Chapter six describes issues to consider when adding an application
server to the database.

Chapter seven describes our problem reporting system.

The appendices include the list of Kerberos error messages, and a
complete list of the time zones understood by `kadmin'.


File: krb5-admin.info,  Node: How Kerberos Works,  Next: Configuration Files,  Prev: Introduction,  Up: Top

How Kerberos Works
******************

This section provides a simplified description of a general user's
interaction with the Kerberos system.  This interaction happens
transparently--users don't need to know and probably don't care about
what's going on--but Kerberos administrators might find a schematic
description of the process useful.  This description glosses over a lot
of details; for more information, see Kerberos: An Authentication
Service for Open Network Systems, a paper presented at Winter USENIX
1988, in Dallas, Texas.  This paper can be retreived by FTP from
`athena-dist.mit.edu', in the location:
`/pub/ATHENA/kerberos/doc/usenix.PS'.

* Menu:

* Network Services and Their Client Programs::
* Kerberos Tickets::
* The Kerberos Database::
* Kerberos Realms::
* The Ticket-Granting Ticket::
* Network Services and the Master Database::
* The User/Kerberos Interaction::
* Definitions::


File: krb5-admin.info,  Node: Network Services and Their Client Programs,  Next: Kerberos Tickets,  Prev: How Kerberos Works,  Up: How Kerberos Works

Network Services and Their Client Programs
==========================================

In an environment that provides network services, you use "client"
programs to request "services" from "server" programs that are
somewhere on the network.  Suppose you have logged in to a workstation
and you want to `rlogin' to a typical UNIX host.  You use the local
`rlogin' client program to contact the remote machine's `rlogind'
daemon.


File: krb5-admin.info,  Node: Kerberos Tickets,  Next: The Kerberos Database,  Prev: Network Services and Their Client Programs,  Up: How Kerberos Works

Kerberos Tickets
================

Under Kerberos, the `klogind' daemon allows you to login to a remote
machine if you can provide `klogind' a Kerberos ticket which proves
your identity.  In addition to the ticket, you must also have
possession of the corresponding ticket session key. The combination of
a ticket and the ticket's session key is known as a credential.

Typically, a client program automatically obtains credentials
identifying the person using the client program.  The credentials are
obtained from a Kerberos server that resides somewhere on the network.
A Kerberos server maintains a database of user, server, and password
information.


File: krb5-admin.info,  Node: The Kerberos Database,  Next: Kerberos Realms,  Prev: Kerberos Tickets,  Up: How Kerberos Works

The Kerberos Database
=====================

Kerberos will give you credentials only if you have an entry in the
Kerberos server's "Kerberos database".  Your database entry includes
your Kerberos "principal" (an identifying string, which is often just
your username), and your Kerberos password.  Every Kerberos user must
have an entry in this database.


File: krb5-admin.info,  Node: Kerberos Realms,  Next: The Ticket-Granting Ticket,  Prev: The Kerberos Database,  Up: How Kerberos Works

Kerberos Realms
===============

Each administrative domain will have its own Kerberos database, which
contains information about the users and services for that particular
site or administrative domain.  This administrative domain is the
"Kerberos realm".

Each Kerberos realm will have at least one Kerberos server, where the
master Kerberos database for that site or administrative domain is
stored.  A Kerberos realm may also have one or more "slave servers",
which have read-only copies of the Kerberos database that are
periodically propagated from the master server.  For more details on how
this is done, see the "Set Up the Slave KDCs for Database Propagation"
and "Propagate the Database to Each Slave KDC" sections of the Kerberos
V5 Installation Guide.


File: krb5-admin.info,  Node: The Ticket-Granting Ticket,  Next: Network Services and the Master Database,  Prev: Kerberos Realms,  Up: How Kerberos Works

The Ticket-Granting Ticket
==========================

The `kinit' command prompts for your password.  If you enter it
successfully, you will obtain a "ticket-granting ticket" and a "ticket
session key" which gives you the right to use the ticket.  This
combination of the ticket and its associated key is known as your
"credentials".  As illustrated below, client programs use your
ticket-granting ticket credentials in order to obtain client-specific
credentials as needed.

Your credentials are stored in a "credentials cache", which is often
just a file in `/tmp'.  The credentials cache is also called the
"ticket file", especially in Kerberos V4 documentation.  Note, however,
that a credentials cache does not have to be stored in a file.


File: krb5-admin.info,  Node: Network Services and the Master Database,  Next: The User/Kerberos Interaction,  Prev: The Ticket-Granting Ticket,  Up: How Kerberos Works

Network Services and the Master Database
========================================

The master database also contains entries for all network services that
require Kerberos authentication.  Suppose that your site has a machine,
`laughter.mit.edu', that requires Kerberos authentication from anyone
who wants to `rlogin' to it.  The host's Kerberos realm is
`ATHENA.MIT.EDU'.

This service must be registered in the Kerberos database, using the
proper service name, which in this case is the "principal":

     host/laughter.mit.edu@ATHENA.MIT.EDU

The `/' character separates the Kerberos "primary" (in this case,
`host') from the "instance" (in this case, `laughter.mit.edu'); the `@'
character separates the realm name (in this case, `ATHENA.MIT.EDU')
from the rest of the principal.  The primary, `host', denotes the name
or type of the service that is being offered:  generic host-level
access to the machine.  The instance, `laughter.mit.edu', names the
specific machine that is offering this service.  There will generally be
many different machines, each offering one particular type of service,
and the instance serves to give each one of these servers a different
Kerberos principal.

* Menu:

* The Keytab File::


File: krb5-admin.info,  Node: The Keytab File,  Prev: Network Services and the Master Database,  Up: Network Services and the Master Database

The Keytab File
---------------

For each service, there must also be a "service key" known only by
Kerberos and the service.  On the Kerberos server, the service key is
stored in the Kerberos database.

On the server host, these service keys are stored in "key tables",
which are files known as "keytabs".(1)  For example, the service keys
used by services that run as root are usually stored in the keytab file
`/etc/krb5.keytab'.  N.B.: This service key is the equivalent of the
service's password, and must be kept secure.  Data which is meant to be
read only by the service is encrypted using this key.

---------- Footnotes ----------

(1) Keytabs were called "srvtabs" in Kerberos V4.


File: krb5-admin.info,  Node: The User/Kerberos Interaction,  Next: Definitions,  Prev: Network Services and the Master Database,  Up: How Kerberos Works

The User/Kerberos Interaction
=============================

Suppose that you walk up to a host intending to login to it, and then
`rlogin' to the machine `laughter'.  Here's what happens:

  1. You login to the workstation and use the `kinit' command to get a
     ticket-granting ticket.  This command prompts you for your Kerberos
     password.  (On systems running the Kerberos V5 `login' program,
     this may be done as part of the login process, not requiring the
     user to run a separate program.)

       A. The `kinit' command sends your request to the Kerberos master
          server machine.  The server software looks for your principal
          name's entry in the Kerberos database.

       B. If this entry exists, the Kerberos server creates and returns
          a ticket-granting ticket and the key which allows you to use
          it, encrypted by your password.  If `kinit' can decrypt the
          Kerberos reply using the password you provide, it stores this
          ticket in a credentials cache on your local machine for later
          use.  The name of the credentials cache can be specified in
          the `KRB5CCNAME' environment variable.  If this variable is
          not set, the name of the file will be `/tmp/krb5cc_<uid>',
          where <uid> is your UNIX user-id, represented in decimal
          format.

  2. Now you use the `rlogin' client to access the machine `laughter'.

          host% rlogin laughter

       A. The `rlogin' client checks your ticket file to see if you
          have a ticket for the `host' service for `laughter'.  You
          don't, so `rlogin' uses the credential cache's
          ticket-granting ticket to make a request to the master
          server's ticket-granting service.

       B. This ticket-granting service receives the request for a
          ticket for `host/laughter.mit.edu', and looks in the master
          database for an entry for `host/laughter.mit.edu'.  If the
          entry exists, the ticket-granting service issues you a ticket
          for that service.  That ticket is also cached in your
          credentials cache.

       C. The `rlogin' client now sends that ticket to the `laughter'
          `klogind' service program.  The service program checks the
          ticket by using its own service key.  If the ticket is valid,
          it now knows your identity.  If you are allowed to login to
          `laughter' (because your username matches one in /etc/passwd,
          or your Kerberos principal is in the appropriate `.k5login'
          file), `klogind' will let you login.


File: krb5-admin.info,  Node: Definitions,  Prev: The User/Kerberos Interaction,  Up: How Kerberos Works

Definitions
===========

Following are definitions of some of the Kerberos terminology.

client
     an entity that can obtain a ticket.  This entity is usually either
     a user or a host.

host
     a computer that can be accessed over a network.

Kerberos
     in Greek mythology, the three-headed dog that guards the entrance
     to the underworld.  In the computing world, Kerberos is a network
     security package that was developed at MIT.

KDC
     Key Distribution Center.  A machine that issues Kerberos tickets.

keytab
     a key table file containing one or more keys.  A host or service
     uses a "keytab" file in much the same way as a user uses his/her
     password.

principal
     a string that names a specific entity to which a set of
     credentials may be assigned.  It can have an arbitrary number of
     components, but generally has three:

    primary
          the first part of a Kerberos principal.  In the case of a
          user, it is the username.  In the case of a service, it is
          the name of the service.

    instance
          the second part of a Kerberos principal.  It gives
          information that qualifies the primary.  The instance may be
          null.  In the case of a user, the instance is often used to
          describe the intended use of the corresponding credentials.
          In the case of a host, the instance is the fully qualified
          hostname.

    realm
          the logical network served by a single Kerberos database and
          a set of Key Distribution Centers.  By convention, realm
          names are generally all uppercase letters, to differentiate
          the realm from the internet domain.

     The typical format of a typical Kerberos principal is
     primary/instance@REALM.

service
     any program or computer you access over a network.  Examples of
     services include "host" (a host, e.g., when you use `telnet' and
     `rsh'), "ftp" (FTP), "krbtgt" (authentication; cf. ticket-granting
     ticket), and "pop" (email).

ticket
     a temporary set of electronic credentials that verify the identity
     of a client for a particular service.

TGT
     Ticket-Granting Ticket.  A special Kerberos ticket that permits the
     client to obtain additional Kerberos tickets within the same
     Kerberos realm.


File: krb5-admin.info,  Node: Configuration Files,  Next: Using DNS,  Prev: How Kerberos Works,  Up: Top

Configuration Files
*******************

* Menu:

* Supported Encryption Types::
* Salts::
* krb5.conf::
* kdc.conf::


File: krb5-admin.info,  Node: Supported Encryption Types,  Next: Salts,  Prev: Configuration Files,  Up: Configuration Files

Supported Encryption Types
==========================

Any tag in the configuration files which requires a list of encryption
types can be set to some combination of the following strings.

`des-cbc-crc'
     DES cbc mode with CRC-32

`des-cbc-md4'
     DES cbc mode with RSA-MD4

`des-cbc-md5'
     DES cbc mode with RSA-MD5

`des3-cbc-sha1'
`des3-hmac-sha1'
`des3-cbc-sha1-kd'
     triple DES cbc mode with HMAC/sha1

`des-hmac-sha1'
     DES with HMAC/sha1

`aes256-cts-hmac-sha1-96'
`aes256-cts'
     AES-256 CTS mode with 96-bit SHA-1 HMAC

`aes128-cts-hmac-sha1-96'
`aes128-cts'
     AES-128 CTS mode with 96-bit SHA-1 HMAC

`arcfour-hmac'
`rc4-hmac'
`arcfour-hmac-md5'
     RC4 with HMAC/MD5

`arcfour-hmac-exp'
`rc4-hmac-exp'
`arcfour-hmac-md5-exp'
     exportable RC4 with HMAC/MD5

While aes128-cts and aes256-cts are supported for all Kerberos
operations, they are not supported by older versions of our GSSAPI
implementation (krb5-1.3.1 and earlier).

By default, AES is enabled in this release.  Sites wishing to use AES
encryption types on their KDCs need to be careful not to give GSSAPI
services AES keys if the servers have not been updated.  If older
GSSAPI services are given AES keys, then services may fail when clients
supporting AES for GSSAPI are used.  Sites may wish to use AES for user
keys and for the ticket granting ticket key, although doing so requires
specifying what encryption types are used as each principal is created.

If all GSSAPI-based services have been updated before or with the KDC,
this is not an issue.


File: krb5-admin.info,  Node: Salts,  Next: krb5.conf,  Prev: Supported Encryption Types,  Up: Configuration Files

Salts
=====

Your Kerberos key is derived from your password.  To ensure that people
who happen to pick the same password do not have the same key, Kerberos
5 incorporates more information into the key using something called a
salt.  The supported values for salts are as follows.

`normal'
     default for Kerberos Version 5

`v4'
     the only type used by Kerberos Version 4, no salt

`norealm'
     same as the default, without using realm information

`onlyrealm'
     uses only realm information as the salt

`afs3'
     AFS version 3, only used for compatibility with Kerberos 4 in AFS

`special'
     only used in very special cases; not fully supported


File: krb5-admin.info,  Node: krb5.conf,  Next: kdc.conf,  Prev: Salts,  Up: Configuration Files

krb5.conf
=========

The `krb5.conf' file contains Kerberos configuration information,
including the locations of KDCs and admin servers for the Kerberos
realms of interest, defaults for the current realm and for Kerberos
applications, and mappings of hostnames onto Kerberos realms.  Normally,
you should install your `krb5.conf' file in the directory `/etc'.  You
can override the default location by setting the environment variable
`KRB5_CONFIG'.

The `krb5.conf' file is set up in the style of a Windows INI file.
Sections are headed by the section name, in square brackets.  Each
section may contain zero or more relations, of the form:

     foo = bar

or

     fubar = {
             foo = bar
             baz = quux
     }

Placing a `*' at the end of a line indicates that this is the "final"
value for the tag.  This means that neither the remainder of this
configuration file nor any other configuration file will be checked for
any other values for this tag.

For example, if you have the following lines:

     foo = bar*
     foo = baz

then the second value of foo (baz) would never be read.

The `krb5.conf' file may contain any or all of the following sections:

libdefaults
     Contains default values used by the Kerberos V5 library.

login
     Contains default values used by the Kerberos V5 login program.

appdefaults
     Contains default values that can be used by Kerberos V5
     applications.

realms
     Contains subsections keyed by Kerberos realm names.  Each
     subsection describes realm-specific information, including where
     to find the Kerberos servers for that realm.

domain_realm
     Contains relations which map domain names and subdomains onto
     Kerberos realm names.  This is used by programs to determine what
     realm a host should be in, given its fully qualified domain name.

logging
     Contains relations which determine how Kerberos programs are to
     perform logging.

capaths
     Contains the authentication paths used with direct
     (nonhierarchical) cross-realm authentication.  Entries in this
     section are used by the client to determine the intermediate
     realms which may be used in cross-realm authentication.  It is
     also used by the end-service when checking the transited field for
     trusted intermediate realms.


* Menu:

* libdefaults::
* appdefaults::
* login::
* realms (krb5.conf)::
* domain_realm::
* logging::
* capaths::
* Sample krb5.conf File::


File: krb5-admin.info,  Node: libdefaults,  Next: appdefaults,  Prev: krb5.conf,  Up: krb5.conf

[libdefaults]
-------------

The `libdefaults' section may contain any of the following relations:

default_keytab_name
     This relation specifies the default keytab name to be used by
     application servers such as telnetd and rlogind.  The default is
     /etc/krb5.keytab.

default_realm
     Identifies the default Kerberos realm for the client.  Set its
     value to your Kerberos realm.  If this is not specified and the
     TXT record lookup is enabled (see *Note Using DNS::), then that
     information will be used to determine the default realm.  If this
     tag is not set in this configuration file and there is no DNS
     information found, then an error will be returned.

default_tgs_enctypes
     Identifies the supported list of session key encryption types that
     should be returned by the KDC.  The list may be delimited with
     commas or whitespace.  Kerberos supports many different encryption
     types, and support for more is planned in the future. (see *Note
     Supported Encryption Types:: for a list of the accepted values for
     this tag).  The default value is aes256-cts-hmac-sha1-96
     des3-cbc-sha1 arcfour-hmac-md5 des-cbc-crc des-cbc-md5 des-cbc-md4.

default_tkt_enctypes
     Identifies the supported list of session key encryption types that
     should be requested by the client.  The format is the same as for
     _default_tgs_enctypes_.  The default value for this tag is
     aes256-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 des-cbc-crc
     des-cbc-md5 des-cbc-md4.

permitted_enctypes
     Identifies all encryption types that are permitted for use in
     session key encryption.  The default value for this tag is
     aes256-cts-hmac-sha1-96 des3-cbc-sha1 arcfour-hmac-md5 des-cbc-crc
     des-cbc-md5 des-cbc-md4.

clockskew
     Sets the maximum allowable amount of clockskew in seconds that the
     library  will tolerate before assuming that a Kerberos message is
     invalid.  The default value is 300 seconds, or five minutes.

kdc_timesync
     If this is set to 1 (for true), then client machines will compute
     the difference between their time and the time returned by the KDC
     in the timestamps in the tickets and use this value to correct for
     an inaccurate system clock.  This corrective factor is only used
     by the Kerberos library.  The default is 1.

kdc_req_checksum_type
ap_req_checksum_type
safe_checksum_type
     An integer which specifies the type of checksum to use.  Used for
     compatability with DCE security servers which do not support the
     default RSA MD5 used by this version of Kerberos.  The possible
     values and their meanings are as follows.

    1
          CRC32

    2
          RSA MD4

    3
          RSA MD4 DES

    4
          DES CBC

    7
          RSA MD5

    8
          RSA MD5 DES

    9
          NIST SHA

    12
          HMAC SHA1 DES3

    -138
          Microsoft MD5 HMAC checksum type

ccache_type
     Use this parameter on systems which are DCE clients, to specify the
     type of cache to be created by kinit, or when forwarded tickets are
     received.  DCE and Kerberos can share the cache, but some versions
     of DCE do not support the default cache as created by this version
     of Kerberos.  Use a value of 1 on DCE 1.0.3a systems, and a value
     of 2 on DCE 1.1 systems.  The default value is 4.

krb4_srvtab
     Specifies the location of the Kerberos V4 srvtab file.  Default is
     /etc/srvtab.

krb4_config
     Specifies the location of hte Kerberos V4 configuration file.
     Default is /etc/krb.conf.

krb4_realms
     Specifies the location of the Kerberos V4 domain/realm translation
     file.  Default is /etc/krb.realms.

dns_lookup_kdc
     Indicate whether DNS SRV records should be used to locate the KDCs
     and other servers for a realm, if they are not listed in the
     information for the realm.  (Note that the `admin_server' entry
     must be in the file, because the DNS implementation for it is
     incomplete.)

     Enabling this option does open up a type of denial-of-service
     attack, if someone spoofs the DNS records and redirects you to
     another server.  However, it's no worse than a denial of service,
     because that fake KDC will be unable to decode anything you send
     it (besides the initial ticket request, which has no encrypted
     data), and anything the fake KDC sends will not be trusted without
     verification using some secret that it won't know.

     If this option is not specified but `dns_fallback' is, that value
     will be used instead.  If neither option is specified, the behavior
     depends on configure-time options; if none were given, the default
     is to enable this option.  If the DNS support is not compiled in,
     this entry has no effect.

dns_lookup_realm
     Indicate whether DNS TXT records should be used to determine the
     Kerberos realm of a host.

     Enabling this option may permit a redirection attack, where
     spoofed DNS replies persuade a client to authenticate to the wrong
     realm, when talking to the wrong host (either by spoofing yet more
     DNS records or by intercepting the net traffic).  Depending on how
     the client software manages hostnames, however, it could already
     be vulnerable to such attacks.  We are looking at possible ways to
     minimize or eliminate this exposure.  For now, we encourage more
     adventurous sites to try using Secure DNS.

     If this option is not specified but `dns_fallback' is, that value
     will be used instead.  If neither option is specified, the behavior
     depends on configure-time options; if none were given, the default
     is to disable this option.  If the DNS support is not compiled in,
     this entry has no effect.

dns_fallback
     General flag controlling the use of DNS for Kerberos information.
     If both of the preceding options are specified, this option has no
     effect.

extra_addresses
     This allows a computer to use multiple local addresses, in order to
     allow Kerberos to work in a network that uses NATs.  The addresses
     should be in a comma-separated list.

udp_preference_limit
     When sending a message to the KDC, the library will try using TCP
     before UDP if the size of the message is above
     `udp_preference_list'.  If the message is smaller than
     `udp_preference_list', then UDP will be tried before TCP.
     Regardless of the size, both protocols will be tried if the first
     attempt fails.

verify_ap_req_nofail
     If this flag is set, then an attempt to get initial credentials
     will fail if the client machine does not have a keytab.  The
     default for the flag is not set.

renew_lifetime
     The value of this tag is the default renewable lifetime for
     initial tickets.  The default value for the tag is
     0.

noaddresses
     Setting this flag causes the initial Kerberos ticket to be
     addressless.  The default for the flag is set.

forwardable
     If this flag is set, initial tickets by default will be
     forwardable.  The default value for this flag is not set.

proxiable
     If this flag is set, initial tickets by default will be proxiable.
     The default value for this flag is not set.



File: krb5-admin.info,  Node: appdefaults,  Next: login,  Prev: libdefaults,  Up: krb5.conf

[appdefaults]
-------------

Each tag in the [appdefaults] section names a Kerberos V5 application
or an option that is used by some Kerberos V5 application[s].  The
value of the tag defines the default behaviors for that application.

For example:

     [appdefaults]
         telnet = {
             ATHENA.MIT.EDU = {
                  option1 = false
             }
         }
         telnet = {
             option1 = true
             option2 = true
         }
         ATHENA.MIT.EDU = {
             option2 = false
         }
         option2 = true

The above four ways of specifying the value of an option are shown in
order of decreasing precedence.   In this example, if telnet is running
in the realm EXAMPLE.COM, it should, by default, have option1 and
option2 set to true.  However, a telnet program in the realm
ATHENA.MIT.EDU should have option1 set to false and option2 set to
true.  Any other programs in ATHENA.MIT.EDU should have option2 set to
false by default.  Any programs running in other realms should have
option2 set to true.

The list of specifiable options for each application may be found in
that application's man pages.  The application defaults specified here
are overridden by those specified in the [realms] section.

A special application name (afs_krb5) is used by the krb524 service to
know whether new format AFS tokens based on Kerberos 5 can be used
rather than the older format which used a converted Kerberos 4 ticket.
The new format allows for cross-realm authentication without
introducing a security hole.  It is used by default.  Older AFS servers
(before OpenAFS 1.2.8) will not support the new format.  If servers in
your cell do not support the new format, you will need to add an
`afs_krb5' relation to the `appdefaults' section.  The following config
file shows how to disable new format AFS tickets for the
`afs.example.com' cell in the `EXAMPLE.COM' realm.

     [appdefaults]
         afs_krb5 = {
             EXAMPLE.COM = {
                 afs/afs.example.com = false
             }
         }


File: krb5-admin.info,  Node: login,  Next: realms (krb5.conf),  Prev: appdefaults,  Up: krb5.conf

[login]
-------

Each tag in the [login] section of the file is an option for
login.krb5.  This section may contain any of the following relations:

krb5_get_tickets
     Indicate whether or not to use a user's password to get V5 tickets.
     The default value is true.

krb4_get_tickets
     Indicate whether or not to user a user's password to get V4
     tickets.  The default value is false.

krb4_convert
     Indicate whether or not to use the Kerberos conversion daemon to
     get V4 tickets.  The default value is false.  If this is set to
     false and krb4_get_tickets is true, then login will get the V5
     tickets directly using the Kerberos V4 protocol directly.  This
     does not currently work with non-MIT-V4 salt types (such as the
     AFS3 salt type).  Note that if this is set to true and krb524d is
     not running, login will hang for approximately a minute under
     Solaris, due to a Solaris socket emulation bug.

krb_run_aklog
     Indicate whether or not to run aklog.  The default value is
     false.

aklog_path
     Indicate where to find aklog.  The default value is
     $(prefix)/bin/aklog.

accept_passwd
     A true value will cause login not to accept plaintext passwords.
     The default value is false.  This is not yet implemented.


File: krb5-admin.info,  Node: realms (krb5.conf),  Next: domain_realm,  Prev: login,  Up: krb5.conf

[realms]
--------

Each tag in the [realms] section of the file is the name of a Kerberos
realm.  The value of the tag is a subsection with relations that define
the properties of that particular realm.  For each realm, the following
tags may be specified in the realm's subsection:

kdc
     The name of a host running a KDC for that realm.  An optional port
     number (separated from the hostname by a colon) may be included.
     For your computer to be able to communicate with the KDC for each
     realm, this tag must be given a value in each realm subsection in
     the configuration file, or there must be DNS SRV records
     specifying the KDCs (see *Note Using DNS::).

master_kdc
     Identifies the master KDC(s).  Currently, this tag is used in only
     one case: If an attempt to get credentials fails because of an
     invalid password, the client software will attempt to contact the
     master KDC, in case the user's password has just been changed, and
     the updated database has not been propagated to the slave servers
     yet.  (We don't currently check whether the KDC from which the
     initial response came is on the master KDC list.  That may be
     fixed in the future.)

admin_server
     Identifies the host where the administration server is running.
     Typically, this is the master Kerberos server.  This tag must be
     given a value in order to communicate with the kadmin server for
     the realm.

default_domain
     This tag is used for Kerberos 4 compatibility.  Kerberos 4 does not
     require the entire hostname of a server to be in its principal like
     Kerberos 5 does.  This tag provides the domain name needed to
     produce a full hostname when translating V4 principal names into
     V5 principal names.  All servers in this realm are assumed to be
     in the domain given as the value of this tag

v4_instance_convert
     This subsection allows the administrator to configure exceptions
     to the default_domain mapping rule.  It contains V4 instances (the
     tag name) which should be translated to some specific hostname
     (the tag value) as the second component in a Kerberos V5 principal
     name.

v4_realm
     This relation is used by the krb524 library routines when
     converting a V5 principal name to a V4 principal name.  It is used
     when the V4 realm name and the V5 realm name are not the same, but
     still share the same principal names and passwords.  The tag value
     is the Kerberos V4 realm name.

auth_to_local_names
     This subsection allows you to set explicit mappings from principal
     names to local user names.  The tag is the mapping name, and the
     value is the corresponding local user name.

auth_to_local
     This tag allows you to set a general rule for mapping principal
     names to local user names.  It will be used if there is not an
     explicit mapping for the principal name that is being translated.
     The possible values are:

    DB:filename
          The principal will be looked up in the database filename.
          Support for this is not currently compiled in by default.

    RULE:exp
          The local name will be formulated from exp.

          The format for exp is
          `[n:$d..string](regexp)s/pattern/replacement/g'.  The integer
          n indicates how many components the target principal should
          have.  If this matches, then a string will be formed by
          putting together the components of the principal in the order
          indicated by each integer d, and the arbitrary string string
          (i.e. if the principal was johndoe/admin then [2:$2$1foo]
          would result in the string "adminjohndoefoo".  If this string
          matches regexp, then the `s//[g]' substitution command will
          be run over the string.  The optional g will cause the
          substitution to be global over the string, instead of
          replacing only the first match in the string.

    DEFAULT
          The principal name will be used as the local user name.  If
          the principal has more than one component or is not in the
          default realm, this rule is not applicable and the conversion
          will fail.


     For example:

          [realms]
              ATHENA.MIT.EDU = {
                  auth_to_local = {
                      RULE:[2:$1](johndoe)s/^.*$/guest/
                      RULE:[2:$1;$2](^.*;admin$)s/;admin$//
                      RULE:[2:$2](^.*;root)s/^.*$/root/
                      DEFAULT
                      }
                  }

     would result in any principal without `root' or `admin' as the
     second component to be translated with the default rule.  A
     principal with a second component of `admin' will become its first
     component.  `root' will be used as the local name for any
     principal with a second component of `root'.  The exception to
     these two rules are any principals johndoe/*, which will always
     get the local name `guest'.



File: krb5-admin.info,  Node: domain_realm,  Next: logging,  Prev: realms (krb5.conf),  Up: krb5.conf

[domain_realm]
--------------

The [domain_realm] section provides a translation from a domain name or
hostname to a Kerberos realm name.  The tag name can be a host name, or
a domain name, where domain names are indicated by a prefix of a period
(`.').  The value of the relation is the Kerberos realm name for that
particular host or domain.  Host names and domain names should be in
lower case.

If no translation entry applies, the host's realm is considered to be
the hostname's domain portion converted to upper case.  For example, the
following [domain_realm] section:

     [domain_realm]
         .mit.edu = ATHENA.MIT.EDU
         mit.edu = ATHENA.MIT.EDU
         crash.mit.edu = TEST.ATHENA.MIT.EDU
         example.com = EXAMPLE.COM

maps crash.mit.edu into the TEST.ATHENA.MIT.EDU realm.  All other hosts
in the mit.edu domain will map by default to the ATHENA.MIT.EDU realm,
and all hosts in the example.com domain will map by default into the
EXAMPLE.COM realm.  Note the entries for the hosts mit.edu and
example.com.  Without these entries, these hosts would be mapped into
the Kerberos realms `EDU' and `ORG', respectively.


File: krb5-admin.info,  Node: logging,  Next: capaths,  Prev: domain_realm,  Up: krb5.conf

[logging]
---------

The [logging] section indicates how a particular entity is to perform
its logging.  The relations in this section assign one or more values to
the entity name.  Currently, the following entities are used:

kdc
     These entries specify how the KDC is to perform its logging.

admin_server
     These entries specify how the administrative server is to perform
     its logging.

default
     These entries specify how to perform logging in the absence of
     explicit specifications otherwise.

Values are of the following forms:

FILE=<filename>
FILE:<filename>
     This value causes the entity's logging messages to go to the
     specified file.  If the `=' form is used, the file is overwritten.
     If the `:' form is used, the file is appended to.

STDERR
     This value causes the entity's logging messages to go to its
     standard error stream.

CONSOLE
     This value causes the entity's logging messages to go to the
     console, if the system supports it.

DEVICE=<devicename>
     This causes the entity's logging messages to go to the specified
     device.

SYSLOG[:<severity>[:<facility>]]
     This causes the entity's logging messages to go to the system log.

     The "severity" argument specifies the default severity of system
     log messages.  This may be any of the following severities
     supported by the `syslog(3)' call, minus the LOG_ prefix:
     LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE,
     LOG_INFO, and LOG_DEBUG.  For example, a value of `CRIT' would
     specify LOG_CRIT severity.

     The facility argument specifies the facility under which the
     messages are logged.  This may be any of the following facilities
     supported by the syslog(3) call minus the LOG_ prefix:  LOG_KERN,
     LOG_USER, LOG_MAIL, LOG_DAEMON, LOG_AUTH, LOG_LPR, LOG_NEWS,
     LOG_UUCP, LOG_CRON, and LOG_LOCAL0 through LOG_LOCAL7.

     If no severity is specified, the default is ERR.  If no facility is
     specified, the default is AUTH.

In the following example, the logging messages from the KDC will go to
the console and to the system log under the facility LOG_DAEMON with
default severity of LOG_INFO; and the logging messages from the
administrative server will be appended to the file /var/adm/kadmin.log
and sent to the device /dev/tty04.

     [logging]
         kdc = CONSOLE
         kdc = SYSLOG:INFO:DAEMON
         admin_server = FILE:/var/adm/kadmin.log
         admin_server = DEVICE=/dev/tty04


File: krb5-admin.info,  Node: capaths,  Next: Sample krb5.conf File,  Prev: logging,  Up: krb5.conf

[capaths]
---------

In order to perform direct (non-hierarchical) cross-realm
authentication, a database is needed to construct the authentication
paths between the realms.  This section defines that database.

A client will use this section to find the authentication path between
its realm and the realm of the server.  The server will use this section
to verify the authentication path used by the client, by checking the
transited field of the received ticket.

There is a tag for each participating realm, and each tag has subtags
for each of the realms.  The value of the subtags is an intermediate
realm which may participate in the cross-realm authentication.  The
subtags may be repeated if there is more then one intermediate realm.  A
value of "."  means that the two realms share keys directly, and no
intermediate realms should be allowd to participate.

There are n**2 possible entries in this table, but only those entries
which will be needed on the client or the server need to be present.
The client needs a tag for its local realm, with subtags for all the
realms of servers it will need to authenticate with.  A server needs a
tag for each realm of the clients it will serve.

For example, ANL.GOV, PNL.GOV, and NERSC.GOV all wish to use the ES.NET
realm as an intermediate realm.  ANL has a sub realm of TEST.ANL.GOV
which will authenticate with NERSC.GOV but not PNL.GOV.  The [capaths]
section for ANL.GOV systems would look like this:

     [capaths]
         ANL.GOV = {
             TEST.ANL.GOV = .
             PNL.GOV = ES.NET
             NERSC.GOV = ES.NET
             ES.NET = .
         }
         TEST.ANL.GOV = {
             ANL.GOV = .
         }
         PNL.GOV = {
             ANL.GOV = ES.NET
         }
         NERSC.GOV = {
             ANL.GOV = ES.NET
         }
         ES.NET = {
             ANL.GOV = .
         }

The [capaths] section of the configuration file used on NERSC.GOV
systems would look like this:

     [capaths]
         NERSC.GOV = {
             ANL.GOV = ES.NET
             TEST.ANL.GOV = ES.NET
             TEST.ANL.GOV = ANL.GOV
             PNL.GOV = ES.NET
             ES.NET = .
         }
         ANL.GOV = {
             NERSC.GOV = ES.NET
         }
         PNL.GOV = {
             NERSC.GOV = ES.NET
         }
         ES.NET = {
             NERSC.GOV = .
         }
         TEST.ANL.GOV = {
             NERSC.GOV = ANL.GOV
             NERSC.GOV = ES.NET
         }

In the above examples, the ordering is not important, except when the
same subtag name is used more then once.  The client will use this to
determine the path.  (It is not important to the server, since the
transited field is not sorted.)

This feature is not currently supported by DCE.  DCE security servers
can be used with Kerberized clients and servers, but versions prior to
DCE 1.1 did not fill in the transited field, and should be used with
caution.


File: krb5-admin.info,  Node: Sample krb5.conf File,  Prev: capaths,  Up: krb5.conf

Sample krb5.conf File
---------------------

Here is an example of a generic `krb5.conf' file:

     [libdefaults]
         default_realm = ATHENA.MIT.EDU
         default_tkt_enctypes = des3-hmac-sha1 des-cbc-crc
         default_tgs_enctypes = des3-hmac-sha1 des-cbc-crc
         dns_lookup_kdc = true
         dns_lookup_realm = false
     
     [realms]
         ATHENA.MIT.EDU = {
             kdc = kerberos.mit.edu
             kdc = kerberos-1.mit.edu
             kdc = kerberos-2.mit.edu:750
             admin_server = kerberos.mit.edu
             master_kdc = kerberos.mit.edu
             default_domain = mit.edu
         }
         EXAMPLE.COM = {
             kdc = kerberos.example.com
             kdc = kerberos-1.example.com
             admin_server = kerberos.example.com
         }
     
     [domain_realm]
         .mit.edu = ATHENA.MIT.EDU
         mit.edu = ATHENA.MIT.EDU
     
     [capaths]
         ATHENA.MIT.EDU = {
         	EXAMPLE.COM = .
         }
         EXAMPLE.COM = {
         	ATHENA.MIT.EDU = .
         }
     
     [logging]
         kdc = SYSLOG:INFO
         admin_server = FILE=/var/kadm5.log


File: krb5-admin.info,  Node: kdc.conf,  Prev: krb5.conf,  Up: Configuration Files

kdc.conf
========

The `kdc.conf' file contains KDC configuration information, including
defaults used when issuing Kerberos tickets.  Normally, you should
install your `kdc.conf' file in the directory `/usr/local/var/krb5kdc'.
You can override the default location by setting the environment
variable `KRB5_KDC_PROFILE'.

The `kdc.conf' file is set up in the same format as the `krb5.conf'
file.  (*Note krb5.conf::.)  The `kdc.conf' file may contain any or all
of the following three sections:

kdcdefaults
     Contains default values for overall behavior of the KDC.

realms
     Contains subsections keyed by Kerberos realm names.  Each
     subsection describes realm-specific information, including where
     to find the Kerberos servers for that realm.

logging
     Contains relations which determine how Kerberos programs are to
     perform logging.

* Menu:

* kdcdefaults::
* realms (kdc.conf)::
* Sample kdc.conf File::


File: krb5-admin.info,  Node: kdcdefaults,  Next: realms (kdc.conf),  Prev: kdc.conf,  Up: kdc.conf

[kdcdefaults]
-------------

The following relation is defined in the [kdcdefaults] section:

kdc_ports
     This relation lists the ports on which the Kerberos server should
     listen for UDP requests by default.  This list is a comma separated
     list of integers.  If this relation is not specified, the
     compiled-in default is 88,750, the first being the assigned
     Kerberos port and the second which was used by Kerberos V4.

kdc_tcp_ports
     This relation lists the ports on which the Kerberos server should
     listen for TCP connections by default.  This list is a comma
     separated list of integers.  If this relation is not specified,
     the compiled-in default is not to listen for TCP connections at
     all.

     If you wish to change this (which we do not recommend, because the
     current implementation has little protection against
     denial-of-service attacks), the standard port number assigned for
     Kerberos TCP traffic is port 88.

v4_mode
     This string specifies how the KDC should respond to Kerberos 4
     packets.  The possible values are none, disable, full, and
     nopreauth.  The default value is none.


File: krb5-admin.info,  Node: realms (kdc.conf),  Next: Sample kdc.conf File,  Prev: kdcdefaults,  Up: kdc.conf

[realms]
--------

Each tag in the [realms] section of the file names a Kerberos realm.
The value of the tag is a subsection where the relations in that
subsection define KDC parameters for that particular realm.

For each realm, the following tags may be specified in the [realms]
subsection:

acl_file
     (String.)  Location of the access control list (acl) file that
     kadmin uses to determine which principals are allowed which
     permissions on the database.  The default is
     `/usr/local/var/krb5kdc/kadm5.acl'.

admin_keytab
     (String.)  Location of the keytab file that the legacy
     administration daemons `kadmind4' and `v5passwdd' use to
     authenticate to the database.  The default is
     `/usr/local/var/krb5kdc/kadm5.keytab'.

database_name
     (String.)  Location of the Kerberos database for this realm.  The
     default is
     `/usr/local/var/krb5kdc/principal'.

default_principal_expiration
     (Absolute time string.)  Specifies the default expiration date of
     principals created in this realm.  The default value for this tag
     is 0.

default_principal_flags
     (Flag string.)  Specifies the default attributes of principals
     created in this realm.  The format for this string is a
     comma-separated list of flags, with '+' before each flag that
     should be enabled and '-' before each flag that should be
     disabled.   The default is postdateable, forwardable, tgt-based,
     renewable, proxiable, dup-skey, allow-tickets, and service
     enabled..

     There are a number of possible flags:

    postdateable
          Enabling this flag allows the principal to obtain
          postdateable tickets.

    forwardable
          Enabling this flag allows the principal to obtain forwardable
          tickets.

    tgt-based
          Enabling this flag allows a principal to obtain tickets based
          on a ticket-granting-ticket, rather than repeating the
          authentication process that was used to obtain the TGT.

    renewable
          Enabling this flag allows the principal to obtain renewable
          tickets.

    proxiable
          Enabling this flag allows the principal to obtain proxy
          tickets.

    dup-skey
          Enabling this flag allows the principal to obtain a session
          key for another user, permitting user-to-user authentication
          for this principal.

    allow-tickets
          Enabling this flag means that the KDC will issue tickets for
          this principal.  Disabling this flag essentially deactivates
          the principal within this realm.

    preauth
          If this flag is enabled on a client principal, then that
          principal is required to preauthenticate to the KDC before
          receiving any tickets.  On a service principal, enabling this
          flag means that service tickets for this principal will only
          be issued to clients with a TGT that has the preauthenticated
          ticket set.

    hwauth
          If this flag is enabled, then the principal is required to
          preauthenticate using a hardware device before receiving any
          tickets.

    pwchange
          Enabling this flag forces a password change for this
          principal.

    service
          Enabling this flag allows the the KDC to issue service
          tickets for this principal.

    pwservice
          If this flag is enabled, it marks this principal as a
          password change service.  This should only be used in special
          cases, for example, if a user's password has expired, then
          the user has to get tickets for that principal without going
          through the normal password authentication in order to be
          able to change the password.


dict_file
     (String.)  Location of the dictionary file containing strings that
     are not allowed as passwords.  If none is specified or if there is
     no policy assigned to the principal, no dictionary checks of
     passwords will be performed.

kadmind_port
     (Port number.)  Specifies the port on which the kadmind daemon is
     to listen for this realm.  The assigned port for kadmind is
     749.

kpasswd_port
     (Port number.)  Specifies the port on which the kpasswd daemon is
     to listen for this realm.  The default is 464.

key_stash_file
     (String.)  Specifies the location where the master key has been
     stored (via `kdb5_util stash').  The default is
     `/usr/local/var/krb5kdc/.k5.REALM', where REALM is the Kerberos
     realm.

kdc_ports
     (String.)  Specifies the list of ports that the KDC is to listen to
     for UDP requests for this realm.  By default, the value of
     kdc_ports as specified in the [kdcdefaults] section is used.

kdc_tcp_ports
     (String.)  Specifies the list of ports that the KDC is to listen to
     for TCP requests for this realm.  By default, the value of
     kdc_tcp_ports as specified in the [kdcdefaults] section is used.

master_key_name
     (String.)  Specifies the name of the principal associated with the
     master key.  The default is K/M.

master_key_type
     (Key type string.)  Specifies the master key's key type.  The
     default value for this is des3-cbc-sha1.  For a list of all
     possible values, see *Note Supported Encryption Types::.

max_life
     (Delta time string.)  Specifes the maximum time period for which a
     ticket may be valid in this realm.  The default value is
     10 hours.

max_renewable_life
     (Delta time string.)  Specifies the maximum time period during
     which a valid ticket may be renewed in this realm.  The default
     value is 0.

supported_enctypes
     List of key:salt strings.  Specifies the default key/salt
     combinations of principals for this realm.  Any principals created
     through `kadmin' will have keys of these types.  The default value
     for this tag is des3-hmac-sha1:normal des-cbc-crc:normal. For
     lists of possible values, see *Note Supported Encryption Types::
     and *Note Salts::.

reject_bad_transit
     A boolean value (`true', `false').  If set to `true', the KDC will
     check the list of transited realms for cross-realm tickets against
     the transit path computed from the realm names and the `capaths'
     section of its `krb5.conf' file; if the path in the ticket to be
     issued contains any realms not in the computed path, the ticket
     will not be issued, and an error will be returned to the client
     instead.  If this value is set to `false', such tickets will be
     issued anyways, and it will be left up to the application server to
     validate the realm transit path.

     If the `disable-transited-check' flag is set in the incoming
     request, this check is not performed at all.  Having the
     `reject_bad_transit' option will cause such ticket requests to be
     rejected always.

     This transit path checking and config file option currently apply
     only to TGS requests.

     Earlier versions of the MIT release (before 1.2.3) had bugs in the
     application server support such that the server-side checks may
     not be performed correctly.  We recommend turning this option on,
     unless you know that all application servers in this realm have
     been updated to fixed versions of the software, and for whatever
     reason, you don't want the KDC to do the validation.

     This is a per-realm option so that multiple-realm KDCs may control
     it separately for each realm, in case (for example) one realm has
     had the software on its application servers updated but another
     has not.

     This option defaults to `true'.



File: krb5-admin.info,  Node: Sample kdc.conf File,  Prev: realms (kdc.conf),  Up: kdc.conf

Sample kdc.conf File
--------------------

Here's an example of a `kdc.conf' file:

     [kdcdefaults]
         kdc_ports = 88
     
     [realms]
         ATHENA.MIT.EDU = {
             kadmind_port = 749
             max_life = 12h 0m 0s
             max_renewable_life = 7d 0h 0m 0s
             master_key_type = des3-hmac-sha1
             supported_enctypes = des3-hmac-sha1:normal des-cbc-crc:normal des-cbc-crc:v4
         }
     
     [logging]
         kdc = FILE:/usr/local/var/krb5kdc/kdc.log
         admin_server = FILE:/usr/local/var/krb5kdc/kadmin.log


File: krb5-admin.info,  Node: Using DNS,  Next: Administrating the Kerberos Database,  Prev: Configuration Files,  Up: Top

Using DNS
*********

* Menu:

* Mapping Hostnames onto Kerberos Realms::
* Hostnames for KDCs::


File: krb5-admin.info,  Node: Mapping Hostnames onto Kerberos Realms,  Next: Hostnames for KDCs,  Prev: Using DNS,  Up: Using DNS

Mapping Hostnames onto Kerberos Realms
======================================

Mapping hostnames onto Kerberos realms is done in one of two ways.

The first mechanism, which has been in use for years in MIT-based
Kerberos distributions, works through a set of rules in the `krb5.conf'
configuration file.  (*Note krb5.conf::.)  You can specify mappings for
an entire domain or subdomain, and/or on a hostname-by-hostname basis.
Since greater specificity takes precedence, you would do this by
specifying the mappings for a given domain or subdomain and listing the
exceptions.

The second mechanism works by looking up the information in special
`TXT' records in the Domain Name Service.  This is currently not used
by default because security holes could result if the DNS TXT records
were spoofed.  If this mechanism is enabled on the client, it will try
to look up a `TXT' record for the DNS name formed by putting the prefix
`_kerberos' in front of the hostname in question.  If that record is
not found, it will try using `_kerberos' and the host's domain name,
then its parent domain, and so forth.  So for the hostname
BOSTON.ENGINEERING.FOOBAR.COM, the names looked up would be:

     _kerberos.boston.engineering.foobar.com
     _kerberos.engineering.foobar.com
     _kerberos.foobar.com
     _kerberos.com

The value of the first TXT record found is taken as the realm name.
(Obviously, this doesn't work all that well if a host and a subdomain
have the same name, and different realms.  For example, if all the hosts
in the ENGINEERING.FOOBAR.COM domain are in the ENGINEERING.FOOBAR.COM
realm, but a host named ENGINEERING.FOOBAR.COM is for some reason in
another realm.  In that case, you would set up TXT records for all
hosts, rather than relying on the fallback to the domain name.)

Even if you do not choose to use this mechanism within your site, you
may wish to set it up anyway, for use when interacting with other sites.


File: krb5-admin.info,  Node: Hostnames for KDCs,  Prev: Mapping Hostnames onto Kerberos Realms,  Up: Using DNS

Hostnames for KDCs
==================

MIT recommends that your KDCs have a predefined set of CNAME records
(DNS hostname aliases), such as `kerberos' for the master KDC and
`kerberos-1', `kerberos-2', ... for the slave KDCs.  This way, if you
need to swap a machine, you only need to change a DNS entry, rather
than having to change hostnames.

A new mechanism for locating KDCs of a realm through DNS has been added
to the MIT Kerberos V5 distribution.  A relatively new record type
called `SRV' has been added to DNS.  Looked up by a service name and a
domain name, these records indicate the hostname and port number to
contact for that service, optionally with weighting and prioritization.
(See RFC 2782 if you want more information.  You can follow the
example below for straightforward cases.)

The use with Kerberos is fairly straightforward.  The domain name used
in the SRV record name is the domain-style Kerberos realm name.  (It is
possible to have Kerberos realm names that are not DNS-style names, but
we don't recommend it for Internet use, and our code does not support it
well.)  Several different Kerberos-related service names are used:

`_kerberos._udp'
     This is for contacting any KDC by UDP.  This entry will be used
     the most often.  Normally you should list port 88 on each of your
     KDCs.

`_kerberos._tcp'
     This is for contacting any KDC by TCP.  The MIT KDC by default
     will not listen on any TCP ports, so unless you've changed the
     configuration or you're running another KDC implementation, you
     should leave this unspecified.  If you do enable TCP support,
     normally you should use port 88.

`_kerberos-master._udp'
     This entry should refer to those KDCs, if any, that will
     immediately see password changes to the Kerberos database.  This
     entry is used only in one case, when the user is logging in and
     the password appears to be incorrect; the master KDC is then
     contacted, and the same password used to try to decrypt the
     response, in case the user's password had recently been changed
     and the first KDC contacted hadn't been updated.  Only if that
     fails is an "incorrect password" error given.

     If you have only one KDC, or for whatever reason there is no
     accessible KDC that would get database changes faster than the
     others, you do not need to define this entry.

`_kerberos-adm._tcp'
     This should list port 749 on your master KDC.  Support for it is
     not complete at this time, but it will eventually be used by the
     `kadmin' program and related utilities.  For now, you will also
     need the `admin_server' entry in `krb5.conf'.  (*Note krb5.conf::.)

`_kpasswd._udp'
     This should list port 464 on your master KDC.  It is used when a
     user changes her password.

`_kerberos-iv._udp'
     This should refer to your KDCs that serve Kerberos version 4
     requests, if you have Kerberos v4 enabled.


Be aware, however, that the DNS SRV specification requires that the
hostnames listed be the canonical names, not aliases.  So, for example,
you might include the following records in your (BIND-style) zone file:

     $ORIGIN foobar.com.
     _kerberos               TXT       "FOOBAR.COM"
     kerberos                CNAME     daisy
     kerberos-1              CNAME     use-the-force-luke
     kerberos-2              CNAME     bunny-rabbit
     _kerberos._udp          SRV       0 0 88 daisy
                             SRV       0 0 88 use-the-force-luke
                             SRV       0 0 88 bunny-rabbit
     _kerberos-master._udp   SRV       0 0 88 daisy
     _kerberos-adm._tcp      SRV       0 0 749 daisy
     _kpasswd._udp           SRV       0 0 464 daisy

As with the DNS-based mechanism for determining the Kerberos realm of a
host, we recommend distributing the information this way for use by
other sites that may want to interact with yours using Kerberos, even if
you don't immediately make use of it within your own site.  If you
anticipate installing a very large number of machines on which it will
be hard to update the Kerberos configuration files, you may wish to do
all of your Kerberos service lookups via DNS and not put the information
(except for `admin_server' as noted above) in future versions of your
`krb5.conf' files at all.  Eventually, we hope to phase out the listing
of server hostnames in the client-side configuration files; making
preparations now will make the transition easier in the future.


File: krb5-admin.info,  Node: Administrating the Kerberos Database,  Next: Application Servers,  Prev: Using DNS,  Up: Top

Administrating the Kerberos Database
************************************

Your Kerberos database contains all of your realm's Kerberos principals,
their passwords, and other administrative information about each
principal.  For the most part, you will use the `kdb5_util' program to
manipulate the Kerberos database as a whole, and the `kadmin' program
to make changes to the entries in the database.  (One notable exception
is that users will use the `kpasswd' program to change their own
passwords.)  The `kadmin' program has its own command-line interface,
to which you type the database administrating commands.

`Kdb5_util' provides a means to create, delete, load, or dump a
Kerberos database.  It also includes a command to stash a copy of the
master database key in a file on a KDC, so that the KDC can authenticate
itself to the `kadmind' and `krb5kdc' daemons at boot time.

`Kadmin' provides for the maintenance of Kerberos principals, KADM5
policies, and service key tables (keytabs).  It exists as both a
Kerberos client, `kadmin', using Kerberos authentication and an RPC, to
operate securely from anywhere on the network, and as a local client,
`kadmin.local', intended to run directly on the KDC without Kerberos
authentication.  Other than the fact that the remote client uses
Kerberos to authenticate the person using it, the functionalities of
the two versions are identical.  The local version is necessary to
enable you to set up enough of the database to be able to use the remote
version.  It replaces the now obsolete `kdb5_edit' (except for database
dump and load, which are provided by `kdb5_util').

The remote version authenticates to the KADM5 server using the service
principal `kadmin/admin'.  If the credentials cache contains a ticket
for the `kadmin/admin' principal, and the `-c ccache' option is
specified, that ticket is used to authenticate to KADM5.  Otherwise,
the `-p' and `-k' options are used to specify the client Kerberos
principal name used to authenticate.  Once kadmin has determined the
principal name, it requests a `kadmin/admin' Kerberos service ticket
from the KDC, and uses that service ticket to authenticate to KADM5.

* Menu:

* Kadmin Options::
* Date Format::
* Principals::
* Policies::
* Global Operations on the Kerberos Database::
* Cross-realm Authentication::


File: krb5-admin.info,  Node: Kadmin Options,  Next: Date Format,  Prev: Administrating the Kerberos Database,  Up: Administrating the Kerberos Database

Kadmin Options
==============

You can invoke `kadmin' or `kadmin.local' with any of the following
options:

-r REALM
     Use REALM as the default Kerberos realm for the database.

-p principal
     Use the Kerberos principal principal to authenticate to Kerberos.
     If this option is not given, `kadmin' will append `admin' to
     either the primary principal name, the environment variable USER,
     or to the username obtained from `getpwuid', in order of
     preference.

-q query
     Pass query directly to `kadmin'.  This is useful for writing
     scripts that pass specific queries to `kadmin'.

     You can invoke `kadmin' with any of the following options:

-k [-t keytab]
     Use the keytab keytab to decrypt the KDC response instead of
     prompting for a password on the TTY.  In this case, the principal
     will be `host/hostname'.  If -t is not used to specify a keytab,
     then the default keytab will be used.

-c credentials cache
     Use credentials_cache as the credentials cache.  The credentials
     cache should contain a service ticket for the `kadmin/admin'
     service, which can be acquired with the `kinit' program.  If this
     option is not specified, `kadmin' requests a new service ticket
     from the KDC, and stores it in its own temporary ccache.

-w password
     Use password as the password instead of prompting for one on the
     TTY.  Note:  placing the password for a Kerberos principal with
     administration access into a shell script can be dangerous if
     unauthorized users gain read access to the script.

-s admin_server[:port]
     Specifies the admin server that kadmin should contact.

     You can invoke `kadmin.local' with an of the follwing options:

-d_ dbname
     Specifies the name of the Kerberos database.

-e "enctypes ..."
     Sets the list of cryptosystem and salt types to be used for any new
     keys created.  See *Note Supported Encryption Types:: and *Note
     Salts:: for available types.

-m
     Do not authenticate using a keytab.  This option will cause kadmin
     to prompt for the master database password.



File: krb5-admin.info,  Node: Date Format,  Next: Principals,  Prev: Kadmin Options,  Up: Administrating the Kerberos Database

Date Format
===========

Many of the `kadmin' commands take a duration or time as an argument.
The date can appear in a wide variety of formats, such as:

     "15 minutes"
     "7 days"
     "1 month"
     "2 hours"
     "400000 seconds"
     "next year"
     "this Monday"
     "next Monday"
     yesterday
     tomorrow
     now
     "second Monday"
     fortnight
     "3/31/1992 10:00:07 PST"
     "January 23, 2007 10:05pm"
     "22:00 GMT"

Note that if the date specification contains spaces, you must enclose it
in double quotes.  Note also that you cannot use a number without a
unit.  (I.e., ""60 seconds"" is correct, but "60" is incorrect.)  All
keywords are case-insensitive.  The following is a list of all of the
allowable keywords.

Months
     january, jan, february, feb, march, mar, april, apr, may, june,
     jun, july, jul, august, aug, september, sep, sept, october, oct,
     november, nov, december, dec

Days
     sunday, sun, monday, mon, tuesday, tues, tue, wednesday, wednes,
     wed, thursday, thurs, thur, thu, friday, fri, saturday, sat

Units
     year, month, fortnight, week, day, hour, minute, min, second, sec

Relative
     tomorrow, yesterday, today, now, last, this, next, first, second,
     third, fourth, fifth, sixth, seventh, eighth, ninth, tenth,
     eleventh, twelfth, ago

Time Zones
     `kadmin' recognizes abbreviations for most of the world's time
     zones.  A complete listing appears in *Note kadmin Time Zones::.

12-hour Time Delimiters
     am, pm


File: krb5-admin.info,  Node: Principals,  Next: Policies,  Prev: Date Format,  Up: Administrating the Kerberos Database

Principals
==========

Each entry in the Kerberos database contains a Kerberos principal
(*note Definitions::) and the attributes and policies associated with
that principal.

* Menu:

* Retrieving Information About a Principal::
* Privileges::
* Adding or Modifying Principals::
* Deleting Principals::
* Changing Passwords::


File: krb5-admin.info,  Node: Retrieving Information About a Principal,  Next: Privileges,  Prev: Principals,  Up: Principals

Retrieving Information About a Principal
----------------------------------------

* Menu:

* Attributes::
* Retrieving a List of Principals::


File: krb5-admin.info,  Node: Attributes,  Next: Retrieving a List of Principals,  Prev: Retrieving Information About a Principal,  Up: Retrieving Information About a Principal

Attributes
..........

To retrieve a listing of the attributes and/or policies associated with
a principal, use the `kadmin' `get_principal' command, which requires
the "inquire" administrative privilege.  The syntax is:

     get_principal principal

The `get_principal' command has the alias `getprinc'.

For example, suppose you wanted to view the attributes of the principal
`jennifer/root@ATHENA.MIT.EDU'.    You would type:

     shell% kadmin
     kadmin: getprinc jennifer/root
     Principal: jennifer/root@ATHENA.MIT.EDU
     Expiration date: [never]
     Last password change: Mon Jan 31 02:06:40 EDT 2002
     Password Expiration date: [none]
     Maximum ticket life: 0 days 10:00:00
     Maximum renewable life: 7 days 00:00:00
     Last modified: Wed Jul 24 14:46:25 EDT 2002 (joeadmin/admin@ATHENA.MIT.EDU)
     Last successful authentication: Mon Jul 29 18:20:17 EDT 2002
     Last failed authentication: Mon Jul 29 18:18:54 EDT 2002
     Failed password attempts: 3
     Number of keys: 2
     Key: vno 2, Triple DES cbc mode with HMAC/sha1, no salt
     Key: vno 2, DES cbc mode with CRC-32, no salt
     Attributes: DISALLOW_FORWARDABLE, DISALLOW_PROXIABLE
     Policy: [none]
     kadmin:

The `get_principal' command has a `-terse' option, which lists the
fields as a quoted, tab-separated string.  For example:

     kadmin: getprinc -terse jennifer/root
     jennifer/root@ATHENA.MIT.EDU	0	1027458564
     0	36000	 (joeadmin/admin@ATHENA.MIT.EDU
     1027536385	18	2	0	[none]	604800	1027980137
     1027980054	3	2	1	2	16	0	1
     2	1	0
     kadmin:


File: krb5-admin.info,  Node: Retrieving a List of Principals,  Prev: Attributes,  Up: Retrieving Information About a Principal

Retrieving a List of Principals
...............................

To generate a listing of principals, use the `kadmin' `list_principals'
command, which requires the "list" privilege.  The syntax is:

     list_principals [expression]

where expression is a shell-style glob expression that can contain the
characters `*', `?', `[', and `]'.  All policy names matching the
expression are displayed.  The `list_principals' command has the
aliases `listprincs', `get_principals', and `getprincs'.  For example:

     kadmin: listprincs test*
     test3@ATHENA.MIT.EDU
     test2@ATHENA.MIT.EDU
     test1@ATHENA.MIT.EDU
     testuser@ATHENA.MIT.EDU
     kadmin:

If no expression is provided, all principals are printed.


File: krb5-admin.info,  Node: Privileges,  Next: Adding or Modifying Principals,  Prev: Retrieving Information About a Principal,  Up: Principals

Privileges
----------

Administrative privileges for the Kerberos database are stored in the
file `kadm5.acl'.

The format of the file is:

     Kerberos_principal      permissions     [target_principal]	[restrictions]

The Kerberos principal (and optional target principal) can include the
"*" wildcard, so if you want any principal with the instance "admin" to
have full permissions on the database, you could use the principal
"`*/admin@REALM'" where "REALM" is your Kerberos realm.
`target_principal' can also include backreferences to
`Kerberos_principal', in which "*number" matches the component number
in the `Kerberos_principal'.

Note:  a common use of an admin instance is so you can grant separate
permissions (such as administrator access to the Kerberos database) to
a separate Kerberos principal.  For example, the user `joeadmin' might
have a principal for his administrative use, called `joeadmin/admin'.
This way, `joeadmin' would obtain `joeadmin/admin' tickets only when he
actually needs to use those permissions.

The permissions are represented by single letters; UPPER-CASE letters
represent negative permissions.  The permissions are:

a
     allows the addition of principals or policies in the database.

A
     disallows the addition of principals or policies in the database.

d
     allows the deletion of principals or policies in the database.

D
     disallows the deletion of principals or policies in the database.

m
     allows the modification of principals or policies in the database.

M
     disallows the modification of principals or policies in the
     database.

c
     allows the changing of passwords for principals in the database.

C
     disallows the changing of passwords for principals in the database.

i
     allows inquiries to the database.

I
     disallows inquiries to the database.

l
     allows the listing of principals or policies in the database.

L
     disallows the listing of principals or policies in the database.

s
     allows the explicit setting of the key for a principal

S
     disallows the explicit setting of the key for a principal

*
     All privileges (admcil).

x
     All privileges (admcil); identical to "*".

The restrictions are a string of flags.  Allowed restrictions are:

[+ -]flagname
     flag is forced to indicated value.  The permissible flags are the
     same as the `+' and `-' flags for the `kadmin addprinc' and
     `modprinc' commands.

-clearpolicy
     policy is forced to clear

-policy pol
     policy is forced to be pol

expire time
pwexpire time
maxlife time
maxrenewlife time
     associated value will be forced to MIN(time, requested value)

The above flags act as restrictions on any add or modify operation
which is allowed due to that ACL line.

Here is an example of a `kadm5.acl' file.  Note that order is
important; permissions are determined by the first matching entry.

     */admin@ATHENA.MIT.EDU  *
     joeadmin@ATHENA.MIT.EDU  ADMCIL
     joeadmin/*@ATHENA.MIT.EDU il */root@ATHENA.MIT.EDU
     *@ATHENA.MIT.EDU cil *1/admin@ATHENA.MIT.EDU
     */*@ATHENA.MIT.EDU  i
     */admin@EXAMPLE.COM * -maxlife 9h -postdateable

In the above file, any principal in the ATHENA.MIT.EDU realm with an
`admin' instance has all administrative privileges.  The user `joeadmin'
has all permissions with his `admin' instance,
`joeadmin/admin@ATHENA.MIT.EDU' (matches the first line).  He has no
permissions at all with his `null' instance, `joeadmin@ATHENA.MIT.EDU'
(matches the second line).  His root instance has inquire and list
permissions with any other principal that has the instance `root'.  Any
principal in ATHENA.MIT.EDU can inquire, list, or change the password of
their `admin' instance, but not any other `admin' instance.  Any
principal in the realm `ATHENA.MIT.EDU' (except for
`joeadmin@ATHENA.MIT.EDU', as mentioned above) has inquire privileges.
Finally, any principal with an admin instance in EXAMPLE.COM has all
permissions, but any principal that they create or modify will not be
able to get postdateable tickets or tickets with a life of longer than
9 hours.


File: krb5-admin.info,  Node: Adding or Modifying Principals,  Next: Deleting Principals,  Prev: Privileges,  Up: Principals

Adding or Modifying Principals
------------------------------

To add a principal to the database, use the kadmin `add_principal'
command, which requires the "add" administrative privilege.  This
function creates the new principal, prompting twice for a password, and,
if neither the -policy nor -clearpolicy options are specified and the
policy "default" exists, assigns it that policy.  The syntax is:

     kadmin: add_principal [options] principal

To modify attributes of a principal, use the kadmin `modify_principal'
command, which requires the "modify" administrative privilege.  The
syntax is:

     kadmin: modify_principal [options] principal

`add_principal' has the aliases `addprinc' and `ank'(1).
`modify_principal' has the alias `modprinc'.

The `add_principal' and `modify_principal' commands take the following
switches:

-expire date
     Sets the expiration date of the principal to date.

-pwexpire date
     Sets the expiration date of the password to date.

-maxlife maxlife
     Sets the maximum ticket life of the principal to maxlife.

-maxrenewlife maxrenewlife
     Sets the maximum renewable life of tickets for the principal to
     maxrenewlife.

-kvno number
     Explicity sets the key version number to number.  MIT does not
     recommend doing this unless there is a specific reason.

-policy policy
     Sets the policy used by this principal.  (*Note Policies::.)  With
     `modify_principal', the current policy assigned to the principal is
     set or changed.  With `add_principal', if this option is not
     supplied, the -clearpolicy is not specified, and the policy
     "default" exists, that policy is assigned.  If a principal is
     created with no policy, `kadmin' will print a warning message.

-clearpolicy
     For `modify_principal', removes the current policy from a
     principal.  For `add_principal', suppresses the automatic
     assignment of the policy "default".

{-|+}allow_postdated
     The "-allow_postdated" option prohibits this principal from
     obtaining postdated tickets.  "+allow_postdated" clears this flag.
     In effect, "-allow_postdated" sets the
     KRB5_KDB_DISALLOW_POSTDATED flag on the principal in the database.

{-|+}allow_forwardable
     The "-allow_forwardable" option prohibits this principal from
     obtaining forwardable tickets.  "+allow_forwardable" clears this
     flag.  In effect, "-allow_forwardable" sets the
     KRB5_KDB_DISALLOW_FORWARDABLE flag on the principal in the
     database.

{-|+}allow_renewable
     The "-allow_renewable" option prohibits this principal from
     obtaining renewable tickets.  "+allow_renewable" clears this flag.
     In effect, "-allow_renewable" sets the
     KRB5_KDB_DISALLOW_RENEWABLE flag on the principal in the database.

{-|+}allow_proxiable
     The "-allow_proxiable" option prohibits this principal from
     obtaining proxiable tickets.  "+allow_proxiable" clears this flag.
     In effect, "-allow_proxiable" sets the
     KRB5_KDB_DISALLOW_PROXIABLE flag. on the principal in the database.

{-|+}allow_dup_skey
     The "-allow_dup_skey" option disables user-to-user authentication
     for this principal by prohibiting this principal from obtaining a
     session key for another user.  "+allow_dup_skey" clears this flag.
     In effect, "-allow_dup_skey" sets the
     KRB5_KDB_DISALLOW_DUP_SKEY flag on the principal in the database.

{-|+}requires_preauth
     The "+requires_preauth" option requires this principal to
     preauthenticate before being allowed to kinit.  -requires_preauth
     clears this flag.  In effect, +requires_preauth sets the
     KRB5_KDB_REQUIRES_PRE_AUTH flag on the principal in the database.

{-|+}requires_hwauth
     The "+requires_hwauth" flag requires the principal to
     preauthenticate using a hardware device before being allowed to
     kinit.  "-requires_hwauth" clears this flag.  In effect,
     "+requires_hwauth" sets the KRB5_KDB_REQUIRES_HW_AUTH flag on the
     principal in the database.

{-|+}allow_svr
     The "-allow_svr" flag prohibits the issuance of service tickets for
     this principal.  "+allow_svr" clears this flag.  In effect,
     "-allow_svr" sets the
     KRB5_KDB_DISALLOW_SVR flag on the principal in the database.

{-|+}allow_tgs_req
     The "-allow_tgs_req" option specifies that a Ticket-Granting
     Service (TGS) request for a service ticket for this principal is
     not permitted.  You will probably never need to use this option.
     "+allow_tgs_req" clears this flag.  The default is
     "+allow_tgs_req".  In effect, "-allow_tgs_req" sets the
     KRB5_KDB_DISALLOW_TGT_BASED flag on the principal in the database.

{-|+}allow_tix
     The "-allow_tix" option forbids the issuance of any tickets for
     this principal.  "+allow_tix" clears this flag.  The default is
     "+allow_tix".  In effect, "-allow_tix" sets the
     KRB5_KDB_DISALLOW_ALL_TIX flag on the principal in the database.

{-|+}needchange
     The "+needchange" option sets a flag in attributes field to force a
     password change; "-needchange" clears it.  The default is
     "-needchange".  In effect, "+needchange" sets the
     KRB5_KDB_REQUIRES_PWCHANGE flag on the principal in the database.

{-|+}password_changing_service
     The "+password_changing_service" option sets a flag in the
     attributes field marking this principal as a password change
     service. (Again, you will probably never need to use this option.)
     "-password_changing_service" clears the flag.  The default is
     "-password_changing_service".  In effect, the
     "+password_changing_service" option sets the
     KRB5_KDB_PWCHANGE_SERVICE flag on the principal in the database.

-randkey
     Sets the key for the principal to a random value (`add_principal'
     only).  MIT recommends using this option for host keys.

-pw password
     Sets the key of the principal to the specified string and does not
     prompt for a password (`add_principal' only).  MIT does not
     recommend using this option.

-e enc:salt...
     Uses the specified list of enctype-salttype pairs for setting the
     key of the principal.  The quotes are necessary if there are
     multiple enctype-salttype pairs.  This will not function against
     kadmin daemons earlier than krb5-1.2.  See *Note Supported
     Encryption Types:: and *Note Salts:: for available types.

If you want to just use the default values, all you need to do is:

     kadmin: addprinc jennifer
     WARNING: no policy specified for "jennifer@ATHENA.MIT.EDU";
     defaulting to no policy.
     Enter password for principal jennifer@ATHENA.MIT.EDU:  <= Type the password.
     Re-enter password for principal jennifer@ATHENA.MIT.EDU:  <=Type it again.
     Principal "jennifer@ATHENA.MIT.EDU" created.
     kadmin:

If, on the other hand, you want to set up an account that expires on
January 1, 2000, that uses a policy called "stduser", with a temporary
password (which you want the user to change immediately), you would type
the following.  (Note:  each line beginning with => is a continuation
of the previous line.)


     kadmin: addprinc david -expire "1/1/2000 12:01am EST" -policy stduser
     =>  +needchange
     Enter password for principal david@ATHENA.MIT.EDU:  <= Type the password.
     Re-enter password for principal
     david@ATHENA.MIT.EDU:  <= Type it again.
     Principal "david@ATHENA.MIT.EDU" created.
     kadmin:

If you will need cross-realm authentication, you need to add principals
for the other realm's TGT to each realm.  For example, if you need to
do cross-realm authentication between the realms ATHENA.MIT.EDU and
EXAMPLE.COM, you would need to add the principals
`krbtgt/EXAMPLE.COM@ATHENA.MIT.EDU' and
`krbtgt/ATHENA.MIT.EDU@EXAMPLE.COM' to both databases.  You need to be
sure the passwords and the key version numbers (kvno) are the same in
both databases.  This may require explicitly setting the kvno with the
`-kvno' option.  See *Note Cross-realm Authentication:: for more
details.

---------- Footnotes ----------

(1) `ank' was the short form of the equivalent command using the
deprecated `kadmin5' database administrative tool.  It has been kept


File: krb5-admin.info,  Node: Deleting Principals,  Next: Changing Passwords,  Prev: Adding or Modifying Principals,  Up: Principals

Deleting Principals
-------------------

To delete a principal, use the kadmin `delete_principal' command, which
requires the "delete" administrative privilege.  The syntax is:

     delete_principal [-force] principal

`delete_principal' has the alias `delprinc'.  The `-force' option
causes `delete_principal' not to ask if you're sure.  For example:

     kadmin: delprinc jennifer
     Are you sure you want to delete the principal
     "jennifer@ATHENA.MIT.EDU"? (yes/no): yes
     Principal "jennifer@ATHENA.MIT.EDU" deleted.
     Make sure that you have removed this principal from
     all ACLs before reusing.
     kadmin:


File: krb5-admin.info,  Node: Changing Passwords,  Prev: Deleting Principals,  Up: Principals

Changing Passwords
------------------

To change a principal's password use the kadmin `change_password'
command, which requires the "modify" administrative privilege (unless
the principal is changing his/her own password).  The syntax is:

     change_password [options] principal

The `change_password' option has the alias `cpw'.  `change_password'
takes the following options:

-randkey
     Sets the key of the principal to a random value.

-pw password
     Sets the password to the string password.  MIT does not recommend
     using this option.

-e "enc:salt..."
     Uses the specified list of enctype-salttype pairs for setting the
     key of the principal.  The quotes are necessary if there are
     multiple enctype-salttype pairs.  This will not function against
     kadmin daemons earlier than krb5-1.2.  See *Note Supported
     Encryption Types:: and *Note Salts:: for possible values.

-keepold
     Keeps the previous kvno's keys around.  There is no easy way to
     delete the old keys, and this flag is usually not necessary except
     perhaps for TGS keys.  Don't use this flag unless you know what
     you're doing.


For example:

     kadmin: cpw david
     Enter password for principal david@ATHENA.MIT.EDU:  <= Type the new password.
     Re-enter password for principal david@ATHENA.MIT.EDU:  <= Type it again.
     Password for david@ATHENA.MIT.EDU changed.
     kadmin:

Note that `change_password' will not let you change the password to one
that is in the principal's password history.


File: krb5-admin.info,  Node: Policies,  Next: Global Operations on the Kerberos Database,  Prev: Principals,  Up: Administrating the Kerberos Database

Policies
========

A policy is a set of rules governing passwords.  Policies can dictate
minimum and maximum password lifetimes, minimum number of characters and
character classes a password must contain, and the number of old
passwords kept in the database.

* Menu:

* Retrieving Policies::
* Retrieving the List of Policies::
* Adding or Modifying Policies::
* Deleting Policies::


File: krb5-admin.info,  Node: Retrieving Policies,  Next: Retrieving the List of Policies,  Prev: Policies,  Up: Policies

Retrieving Policies
-------------------

To retrieve a policy, use the kadmin `get_policy' command, which
requires the "inquire" administrative privilege.  The syntax is:

     get_policy [-terse] policy

The `get_policy' command has the alias `getpol'.  For example:

     kadmin: get_policy admin
     Policy: admin
     Maximum password life: 180 days 00:00:00
     Minimum password life: 00:00:00
     Minimum password length: 6
     Minimum number of password character classes: 2
     Number of old keys kept: 5
     Reference count: 17
     kadmin:

The "reference count" is the number of principals using that policy.

The `get_policy' command has a `-terse' option, which lists each field
as a quoted, tab-separated string.  For example:

     kadmin: get_policy -terse admin
     admin   15552000        0       6       2       5       17
     kadmin:


File: krb5-admin.info,  Node: Retrieving the List of Policies,  Next: Adding or Modifying Policies,  Prev: Retrieving Policies,  Up: Policies

Retrieving the List of Policies
-------------------------------

You can retrieve the list of policies with the kadmin `list_policies'
command, which requires the "list" privilege.  The syntax is:

     list_policies [expression]

where expression is a shell-style glob expression that can contain the
characters *, ?, and [].  All policy names matching the expression are
displayed.  The `list_policies' command has the aliases `listpols',
`get_policies', and `getpols'.  For example:

     kadmin:  listpols
     test-pol
     dict-only
     once-a-min
     test-pol-nopw
     
     kadmin:  listpols t*
     test-pol
     test-pol-nopw
     kadmin:


File: krb5-admin.info,  Node: Adding or Modifying Policies,  Next: Deleting Policies,  Prev: Retrieving the List of Policies,  Up: Policies

Adding or Modifying Policies
----------------------------

To add a new policy, use the kadmin `add_policy' command, which
requires the "add" administrative privilege.  The syntax is:

     add_policy [options] policy_name

To modify attributes of a principal, use the kadmin `modify_policy'
command, which requires the "modify" administrative privilege.  The
syntax is:

     modify_policy [options] policy_name

`add_policy' has the alias `addpol'.  `modify_poilcy' has the alias
`modpol'.

The `add_policy' and `modify_policy' commands take the following
switches:

-maxlife time
     Sets the maximum lifetime of a password to time.

-minlife time
     Sets the minimum lifetime of a password to time.

-minlength length
     Sets the minimum length of a password to length characters.

-minclasses number
     Requires at least number of character classes in a password.

-history number
     Sets the number of past keys kept for a principal to number.


File: krb5-admin.info,  Node: Deleting Policies,  Prev: Adding or Modifying Policies,  Up: Policies

Deleting Policies
-----------------

To delete a policy, use the `kadmin' `delete_policy' command, which
requires the "delete" administrative privilege.  The syntax is:

     delete_policy [-force] policy_name

The `delete_policy' command has the alias `delpol'.  It prompts for
confirmation before deletion.  For example:

     kadmin: delete_policy guests
     Are you sure you want to delete the policy "guests"?
     (yes/no): yes
     kadmin:

Note that you must cancel the policy from all principals before deleting
it.  The `delete_policy' command will fail if it is in use by any
principals.


File: krb5-admin.info,  Node: Global Operations on the Kerberos Database,  Next: Cross-realm Authentication,  Prev: Policies,  Up: Administrating the Kerberos Database

Global Operations on the Kerberos Database
==========================================

* Menu:

* Dumping a Kerberos Database to a File::
* Restoring a Kerberos Database from a Dump File::
* Creating a Stash File::
* Creating and Destroying a Kerberos Database::

The `kdb5_util' command is the primary tool for administrating the
Kerberos database.  The syntax is:

     kdb5_util command [kdb5_util_options] [command_options]

The `kdb5_util' command takes the following options, which override the
defaults specified in the configuration files:

-r realm
     specifies the the Kerberos realm of the database.

-d database_name
     specifies the name under which the principal database is stored.

-k master_key_type
     specifies the key type of the master key in the database.

-M master_key_name
     specifies the principal name of the master key in the database.

-m
     indicates that the master database password should be read from
     the TTY rather than fetched from a file on disk.

-sf stash_file
     specifies the stash file of the master database password

-P password
     specifies the master database password.  MIT does not recommend
     using this option.



File: krb5-admin.info,  Node: Dumping a Kerberos Database to a File,  Next: Restoring a Kerberos Database from a Dump File,  Prev: Global Operations on the Kerberos Database,  Up: Global Operations on the Kerberos Database

Dumping a Kerberos Database to a File
-------------------------------------

To dump a Kerberos database into a file, use the `kdb5_util' `dump'
command on one of the KDCs.  The syntax is:

     kdb5_util dump [-old] [-b6] [-b7] [-ov]
     [-verbose] [-mkey_convert] [-new_mkey_file] [filename
     [principals...]]

The `kdb5_util dump' command takes the following options:

-old
     causes the dump to be in the Kerberos 5 Beta 5 and earlier dump
     format ("kdb5_edit load_dump version 2.0").

-b6
     causes the dump to be in the Kerberos 5 Beta 6 format ("kdb5_edit
     load_dump version 3.0").

-b7
     causes the dump to be in the Kerberos 5 Beta 7 format ("kdbt_edit
     load_dump version 4").

-ov
     causes the dump to be in ovsec_adm_export format.  Currently, the
     only way to preserve per-principal policy information is to use
     this in conjunction with a normal dump.

-verbose
     causes the name of each principal and policy to be printed as it is
     dumped.

-mkey_convert
     prompts for a new master password, and then dumps the database with
     all keys reencrypted in this new master key

-new_mkey_file
     reads a new key from the default keytab and then dumps the database
     with all keys reencrypted in this new master key

For example:

     shell% kdb5_util dump dumpfile
     shell%

     shell% kbd5_util dump -verbose dumpfile
     kadmin/admin@ATHENA.MIT.EDU
     krbtgt/ATHENA.MIT.EDU@ATHENA.MIT.EDU
     kadmin/history@ATHENA.MIT.EDU
     K/M@ATHENA.MIT.EDU
     kadmin/changepw@ATHENA.MIT.EDU
     shell%

If you specify which principals to dump, you must use the full
principal, as in the following example.  (The line beginning with => is
a continuation of the previous line.):

     shell% kdb5_util dump -verbose dumpfile K/M@ATHENA.MIT.EDU
     => kadmin/admin@ATHENA.MIT.EDU
     kadmin/admin@ATHENA.MIT.EDU
     K/M@ATHENA.MIT.EDU
     shell%

Otherwise, the principals will not match those in the database and will
not be dumped:

     shell% kdb5_util dump -verbose dumpfile K/M kadmin/admin
     shell%

If you do not specify a dump file, `kdb5_util' will dump the database
to the standard output.

There is currently a bug where the default dump format omits the
per-principal policy information.  In order to dump all the data
contained in the Kerberos database, you must perform a normal dump (with
no option flags) and an additional dump using the "-ov" flag to a
different file.


File: krb5-admin.info,  Node: Restoring a Kerberos Database from a Dump File,  Next: Creating a Stash File,  Prev: Dumping a Kerberos Database to a File,  Up: Global Operations on the Kerberos Database

Restoring a Kerberos Database from a Dump File
----------------------------------------------

To restore a Kerberos database dump from a file, use the `kdb5_util'
`load' command on one of the KDCs.  The syntax is:

     kdb5_util load [-old] [-b6] [-b7] [-ov] [-verbose]
     [-update] [-hash] dumpfilename dbname [admin_dbname]

The `kdb5_util load' command takes the following options:

-old
     requires the dump to be in the Kerberos 5 Beta 5 and earlier dump
     format ("kdb5_edit load_dump version 2.0").

-b6
     requires the dump to be in the Kerberos 5 Beta 6 format ("kdb5_edit
     load_dump version 3.0").

-b7
     requires the dump to be in the Kerberos 5 Beta 7 format ("kdb5_edit
     load_dump version 4").

-ov
     requires the dump to be in ovsec_adm_export format.

-verbose
     causes the name of each principal and policy to be printed as it is
     loaded.

-update
     causes records from the dump file to be updated in or added to the
     existing database.  This is useful in conjunction with an
     ovsec_adm_export format dump if you want to preserve per-principal
     policy information, since the current default format does not
     contain this data.

-hash
     causes the database to be stored as a hash rather than a binary
     tree.

For example:

     shell% kdb5_util load dumpfile principal
     shell%

     shell% kdb5_util load -update dumpfile principal
     shell%

If the database file exists, and the -update flag was not given,
`kdb5_util' will overwrite the existing database.


File: krb5-admin.info,  Node: Creating a Stash File,  Next: Creating and Destroying a Kerberos Database,  Prev: Restoring a Kerberos Database from a Dump File,  Up: Global Operations on the Kerberos Database

Creating a Stash File
---------------------

A stash file allows a KDC to authenticate itself to the database
utilities, such as `kadmin', `kadmind', `krb5kdc', and `kdb5_util'.

To create a stash file, use the `kdb5_util' `stash' command.  The
syntax is:

     kdb5_util stash [-f keyfile]

For example:

     shell% kdb5_util stash
     kdb5_util: Cannot find/read stored master key while reading master key
     kdb5_util: Warning: proceeding without master key
     Enter KDC database master key:  <= Type the KDC database master password.
     shell%

If you do not specify a stash file, `kdb5_util' will stash the key in
the file specified in your `kdc.conf' file.


File: krb5-admin.info,  Node: Creating and Destroying a Kerberos Database,  Prev: Creating a Stash File,  Up: Global Operations on the Kerberos Database

Creating and Destroying a Kerberos Database
-------------------------------------------

If you need to create a new Kerberos database, use the `kdb5_util'
`create' command.  The syntax is:

     kdb5_util create [-s]

If you specify the `-s' option, `kdb5_util' will stash a copy of the
master key in a stash file.  (*Note Creating a Stash File::.)  For
example:

     shell% /usr/local/sbin/kdb5_util -r ATHENA.MIT.EDU create -s
     kdb5_util: No such file or directory while setting active database to
     => '/usr/local/var/krb5kdc/principal'
     Initializing database '/usr/local/var/krb5kdc/principal' for
     => realm 'ATHENA.MIT.EDU',
     master key name 'K/M@ATHENA.MIT.EDU'
     You will be prompted for the database Master Password.
     It is important that you NOT FORGET this password.
     Enter KDC database master key:  <= Type the master password.
     Re-enter KDC database master key to verify:  <= Type it again.
     shell%

If you need to destroy the current Kerberos database, use the
`kdb5_util' `destroy' command.  The syntax is:

     kdb5_util destroy [-f]

The `destroy' command destroys the database, first overwriting the disk
sectors and then unlinking the files.  If you specify the `-f' option,
`kdb5_util' will not prompt you for a confirmation before destroying
the database.

     shell% /usr/local/sbin/kdb5_util -r ATHENA.MIT.EDU destroy
     kdb5_util: Deleting KDC database stored in /usr/local/var/krb5kdc/principal, are you sure
     (type yes to confirm)? <== yes
     OK, deleting database '/usr/local/var/krb5kdc/principal'...
     
     shell%


File: krb5-admin.info,  Node: Cross-realm Authentication,  Prev: Global Operations on the Kerberos Database,  Up: Administrating the Kerberos Database

Cross-realm Authentication
==========================

In order for a KDC in one realm to authenticate Kerberos users in a
different realm, it must share a key with the KDC in the other realm.
In both databases, there must be krbtgt service principals for realms.
These principals should all have the same passwords, key version
numbers, and encryption types.  For example, if the administrators of
ATHENA.MIT.EDU and EXAMPLE.COM wanted to authenticate across the
realms, they would run the following commands on the KDCs in both
realms:

     shell%: kadmin.local -e "des3-hmac-sha1:normal des-cbc-crc:v4"
     kadmin: add_princ -requires_preauth krbtgt/ATHENA.MIT.EDU@EXAMPLE.COM
     Enter password for principal krbtgt/ATHENA.MIT.EDU@EXAMPLE.COM:
     Re-enter password for principal krbtgt/ATHENA.MIT.EDU@EXAMPLE.COM:
     kadmin: add_princ -requires_preauth krbtgt/EXAMPLE.COM@ATHENA.MIT.EDU
     Enter password for principal krbtgt/EXAMPLE.COM@ATHENA.MIT.EDU:
     Enter password for principal krbtgt/EXAMPLE.COM@{No value for `PRIMARYREALML'}:
     kadmin:

Even if most principals in a realm are generally created with the
requires_preauth flag enabled, this flag is not desirable on
cross-realm authentication keys because doing so makes it impossible to
disable preauthentication on a service-by-service basis.  Disabling it
as in the example above is recommended.

It is also very important that these principals have good passwords.
MIT recommends that TGT principal passwords be at least 26 characters
of random ASCII text.


File: krb5-admin.info,  Node: Application Servers,  Next: Backups of Secure Hosts,  Prev: Administrating the Kerberos Database,  Up: Top

Application Servers
*******************

If you need to install the Kerberos V5 programs on an application
server, please refer to the Kerberos V5 Installation Guide.  Once you
have installed the software, you need to add that host to the Kerberos
database (*note Adding or Modifying Principals::), and generate a
"keytab" for that host, that contains the host's key.  You also need to
make sure the host's clock is within your maximum clock skew of the
KDCs.

* Menu:

* Keytabs::
* Clock Skew::
* Getting DNS Information Correct::
* Configuring Your Firewall to Work With Kerberos V5::


File: krb5-admin.info,  Node: Keytabs,  Next: Clock Skew,  Prev: Application Servers,  Up: Application Servers

Keytabs
=======

A "keytab" is a host's copy of its own keylist, which is analogous to a
user's password.  An application server that needs to authenticate
itself to the KDC has to have a keytab that contains its own principal
and key.  Just as it is important for users to protect their passwords,
it is equally important for hosts to protect their keytabs.  You should
always store keytab files on local disk, and make them readable only by
root, and you should never send a keytab file over a network in the
clear.  Ideally, you should run the `kadmin' command to extract a
keytab on the host on which the keytab is to reside.

* Menu:

* Adding Principals to Keytabs::
* Removing Principals from Keytabs::


File: krb5-admin.info,  Node: Adding Principals to Keytabs,  Next: Removing Principals from Keytabs,  Prev: Keytabs,  Up: Keytabs

Adding Principals to Keytabs
----------------------------

To generate a keytab, or to add a principal to an existing keytab, use
the `ktadd' command from `kadmin', which requires the "inquire"
administrative privilege.  (If you use the -glob princ_exp option, it
also requires the "list" administrative privilege.)  The syntax is:

     ktadd [-k[eytab] keytab] [-q] [-e
     key:salt_list] [principal | -glob princ_exp]
     [...]

The `ktadd' command takes the following switches:

-k[eytab] keytab
     use keytab as the keytab file.  Otherwise, `ktadd' will use the
     default keytab file (`/etc/krb5.keytab').

-e "enc:salt..."
     Uses the specified list of enctype-salttype pairs for setting the
     key of the principal.  The quotes are necessary if there are
     multiple enctype-salttype pairs.  This will not function against
     kadmin daemons earlier than krb5-1.2.  See *Note Supported
     Encryption Types:: and *Note Salts:: for all possible values.

-q
     run in quiet mode.  This causes `ktadd' to display less verbose
     information.

principal | -glob principal expression
     add principal, or all principals matching principal expression to
     the keytab.  The rules for principal expression are the same as
     for the kadmin `list_principals' (*note Retrieving a List of
     Principals::) command.

Here is a sample session, using configuration files that enable only
`des-cbc-crc' encryption. (The line beginning with => is a continuation
of the previous line.)

     kadmin: ktadd host/daffodil.mit.edu@ATHENA.MIT.EDU
     kadmin: Entry for principal host/daffodil.mit.edu@ATHENA.MIT.EDU with
          kvno 2, encryption type DES-CBC-CRC added to keytab
          WRFILE:/etc/krb5.keytab.
     kadmin:

     kadmin: ktadd -k /usr/local/var/krb5kdc/kadmind.keytab
     => kadmin/admin kadmin/changepw
     kadmin: Entry for principal kadmin/admin@ATHENA.MIT.EDU with
          kvno 3, encryption type DES-CBC-CRC added to keytab
          WRFILE:/usr/local/var/krb5kdc/kadmind.keytab.
     kadmin:


File: krb5-admin.info,  Node: Removing Principals from Keytabs,  Prev: Adding Principals to Keytabs,  Up: Keytabs

Removing Principals from Keytabs
--------------------------------

To remove a principal from an existing keytab, use the kadmin
`ktremove' command.  The syntax is:

     ktremove [-k[eytab] keytab] [-q] principal [kvno | all | old]

The `ktremove' command takes the following switches:

-k[eytab] keytab
     use keytab as the keytab file.  Otherwise, `ktremove' will use the
     default keytab file (`/etc/krb5.keytab').

-q
     run in quiet mode.  This causes `ktremove' to display less verbose
     information.

principal
     the principal to remove from the keytab.  (Required.)

kvno
     remove all entries for the specified principal whose Key Version
     Numbers match kvno.

all
     remove all entries for the specified principal

old
     remove all entries for the specified principal except those with
     the highest kvno.

For example:

     kadmin: ktremove -k /usr/local/var/krb5kdc/kadmind.keytab kadmin/admin
     kadmin: Entry for principal kadmin/admin with kvno 3 removed
          from keytab WRFILE:/usr/local/var/krb5kdc/kadmind.keytab.
     kadmin:


File: krb5-admin.info,  Node: Clock Skew,  Next: Getting DNS Information Correct,  Prev: Keytabs,  Up: Application Servers

Clock Skew
==========

In order to prevent intruders from resetting their system clocks in
order to continue to use expired tickets, Kerberos V5 is set up to
reject ticket requests from any host whose clock is not within the
specified maximum clock skew of the KDC (as specified in the `kdc.conf'
file).  Similarly, hosts are configured to reject responses from any
KDC whose clock is not within the specified maximum clock skew of the
host (as specified in the `krb5.conf' file).  The default value for
maximum clock skew is 300 seconds, or five minutes.

MIT suggests that you add a line to client machines' `/etc/rc' files to
synchronize the machine's clock to your KDC at boot time.  On UNIX
hosts, assuming you had a kdc called `kerberos' in your realm, this
would be:

     gettime -s kerberos

If the host is not likely to be rebooted frequently, you may also want
to set up a cron job that adjusts the time on a regular basis.


File: krb5-admin.info,  Node: Getting DNS Information Correct,  Next: Configuring Your Firewall to Work With Kerberos V5,  Prev: Clock Skew,  Up: Application Servers

Getting DNS Information Correct
===============================

Several aspects of Kerberos rely on name service.  In order for Kerberos
to provide its high level of security, it is less forgiving of name
service problems than some other parts of your network.  It is important
that your Domain Name System (DNS) entries and your hosts have the
correct information.

Each host's canonical name must be the fully-qualified host name
(including the domain), and each host's IP address must reverse-resolve
to the canonical name.

Other than the `localhost' entry, make all entries in each machine's
`/etc/hosts' file in the following form:

     IP address      fully-qualified hostname        aliases

Here is a sample `/etc/hosts' file:

     # this is a comment
     127.0.0.1       localhost localhost@mit.edu
     10.0.0.6       daffodil.mit.edu trillium wake-robin

Additionally, on Solaris machines, you need to be sure the "hosts"
entry in the file
`/etc/nsswitch.conf' includes the source "dns" as well as "file".

Finally, each host's keytab file must include a host/key pair for the
host's canonical name.  You can list the keys in a keytab file by
issuing the command `klist -k'.  For example:

     viola# klist -k
     Keytab name: /etc/krb5.keytab
     KVNO Principal
     ---- ------------------------------------------------------------
        1 host/daffodil.mit.edu@ATHENA.MIT.EDU

If you telnet to the host with a fresh credentials cache (ticket file),
and then `klist', the host's service principal should be
host/fully-qualified-hostname@REALM_NAME.


File: krb5-admin.info,  Node: Configuring Your Firewall to Work With Kerberos V5,  Prev: Getting DNS Information Correct,  Up: Application Servers

Configuring Your Firewall to Work With Kerberos V5
==================================================

If you need off-site users to be able to get Kerberos tickets in your
realm, they must be able to get to your KDC.  This requires either that
you have a slave KDC outside your firewall, or you configure your
firewall to allow UDP requests into at least one of your KDCs, on
whichever port the KDC is running.  (The default is port 88; other
ports may be specified in the KDC's kdc.conf file.)  Similarly, if you
need off-site users to be able to change their passwords in your realm,
they must be able to get to your Kerberos admin server.  The default
port for the admin server is 749.

If your on-site users inside your firewall will need to get to KDCs in
other realms, you will also need to configure your firewall to allow
outgoing TCP and UDP requests to port 88.  Additionally, if they will
need to get to any Kerberos V4 KDCs, you may also need to allow TCP and
UDP requests to port 750.  If your on-site users inside your firewall
will need to get to Kerberos admin servers in other realms, you will
also need to allow outgoing TCP and UDP requests to port
749.

If any of your KDCs are outside your firewall, you will need to allow
`kprop' requests to get through to the remote KDC.  `Kprop' uses the
krb5_prop service on port 754 (tcp).

If you need your off-site users to have access to machines inside your
firewall, you need to allow TCP connections from their off-site hosts on
the appropriate ports for the programs they will be using.  The
following lines from `/etc/services' show the default port numbers for
the Kerberos V5 programs:

     ftp           21/tcp           # Kerberos ftp and telnet use the
     telnet        23/tcp           # default ports
     kerberos      88/udp    kdc    # Kerberos V5 KDC
     kerberos      88/tcp    kdc    # Kerberos V5 KDC
     klogin        543/tcp          # Kerberos authenticated rlogin
     kshell        544/tcp   cmd    # and remote shell
     kerberos-adm  749/tcp          # Kerberos 5 admin/changepw
     kerberos-adm  749/udp          # Kerberos 5 admin/changepw
     krb5_prop     754/tcp          # Kerberos slave propagation
     eklogin       2105/tcp         # Kerberos auth. & encrypted rlogin
     krb524        4444/tcp         # Kerberos 5 to 4 ticket translator

By default, Kerberos V5 `telnet' and `ftp' use the same ports as the
standard `telnet' and `ftp' programs, so if you already allow telnet
and ftp connections through your firewall, the Kerberos V5 versions
will get through as well.  If you do not already allow telnet and ftp
connections through your firewall, but need your users to be able to
use Kerberos V5 telnet and ftp, you can either allow ftp and telnet
connections on the standard ports, or switch these programs to
non-default port numbers and allow ftp and telnet connections on those
ports to get through.

Kerberos V5 `rlogin' uses the `klogin' service, which by default uses
port 543.  Encrypted Kerberos V5 rlogin uses the `eklogin' service,
which by default uses port 2105.

Kerberos V5 `rsh' uses the `kshell' service, which by default uses port
544.  However, the server must be able to make a TCP connection from
the kshell port to an arbitrary port on the client, so if your users
are to be able to use `rsh' from outside your firewall, the server they
connect to must be able to send outgoing packets to arbitrary port
numbers.  Similarly, if your users need to run `rsh' from inside your
firewall to hosts outside your firewall, the outside server needs to be
able to connect to an arbitrary port on the machine inside your
firewall.  Because Kerberos V5 `rcp' uses `rsh', the same issues apply.
If you need to use `rsh' (or `rcp') through your firewall and are
concerned with the security implications of allowing connections to
arbitrary ports, MIT suggests that you have rules that specifically
name these applications and, if possible, list the allowed hosts.

The book `UNIX System Security', by David Curry, is a good starting
point for learning to configure firewalls.


File: krb5-admin.info,  Node: Backups of Secure Hosts,  Next: Bug Reporting,  Prev: Application Servers,  Up: Top

Backups of Secure Hosts
***********************

When you back up a secure host, you should exclude the host's keytab
file from the backup.  If someone obtained a copy of the keytab from a
backup, that person could make any host masquerade as the host whose
keytab was compromised.  This could be particularly dangerous if the
compromised keytab was from one of your KDCs.  If the machine has a disk
crash and the keytab file is lost, it is easy to generate another keytab
file.  (*Note Adding Principals to Keytabs::.)  If you are unable to
exclude particular files from backups, you should ensure that the
backups are kept as secure as the host's root password.

* Menu:

* Backing Up the Kerberos Database::


File: krb5-admin.info,  Node: Backing Up the Kerberos Database,  Prev: Backups of Secure Hosts,  Up: Backups of Secure Hosts

Backing Up the Kerberos Database
================================

As with any file, it is possible that your Kerberos database could
become corrupted.  If this happens on one of the slave KDCs, you might
never notice, since the next automatic propagation of the database would
install a fresh copy.  However, if it happens to the master KDC, the
corrupted database would be propagated to all of the slaves during the
next propagation.  For this reason, MIT recommends that you back up
your Kerberos database regularly.  Because the master KDC is
continuously dumping the database to a file in order to propagate it to
the slave KDCs, it is a simple matter to have a cron job periodically
copy the dump file to a secure machine elsewhere on your network.  (Of
course, it is important to make the host where these backups are stored
as secure as your KDCs, and to encrypt its transmission across your
network.)  Then if your database becomes corrupted, you can load the
most recent dump onto the master KDC.  (*Note Restoring a Kerberos
Database from a Dump File::.)


File: krb5-admin.info,  Node: Bug Reporting,  Next: Appendix,  Prev: Backups of Secure Hosts,  Up: Top

Bug Reporting
*************

In any complex software, there will be bugs.  If you have successfully
built and installed Kerberos V5, please use the `krb5-send-pr' program
to fill out a Problem Report should you encounter any errors in our
software.

Bug reports that include proposed fixes are especially welcome.  If you
do include fixes, please send them using either context diffs or unified
diffs (using `diff -c' or `diff -u', respectively).  Please be careful
when using "cut and paste" or other such means to copy a patch into a
bug report; depending on the system being used, that can result in
converting TAB characters into spaces, which makes applying the patches
more difficult.

The `krb5-send-pr' program is installed in the directory
`/usr/local/sbin'.

The `krb5-send-pr' program enters the problem report into our Problem
Report Management System (PRMS), which automatically assigns it to the
engineer best able to help you with problems in the assigned category.

The `krb5-send-pr' program will try to intelligently fill in as many
fields as it can.  You need to choose the "category", "class",
"severity", and "priority" of the problem, as well as giving us as much
information as you can about its exact nature.

The PR category will be one of:

     krb5-admin   krb5-appl    krb5-build   krb5-clients
     krb5-doc     krb5-kdc     krb5-libs    krb5-misc
     pty          telnet       test

Choose the category that best describes the area under which your
problem falls.

The class can be "sw-bug", "doc-bug", "change-request", or "support".
The first two are exactly as their names imply.  Use change-request
when the software is behaving according to specifications, but you want
to request changes in some feature or behavior.  The support class is
intended for more general questions about building or using Kerberos V5.

The severity of the problem indicates the problem's impact on the
usability of Kerberos V5.  If a problem is "critical", that means the
product, component or concept is completely non-operational, or some
essential functionality is missing, and no workaround is known.  A
"serious" problem is one in which the product, component or concept is
not working properly or significant functionality is missing.  Problems
that would otherwise be considered critical are rated serious when a
workaround is known.  A "non-critical" problem is one that is indeed a
problem, but one that is having a minimal effect on your ability to use
Kerberos V5.  E.g., The product, component or concept is working in
general, but lacks features, has irritating behavior, does something
wrong, or doesn't match its documentation.  The default severity is
serious.

The priority indicates how urgent this particular problem is in
relation to your work.  Note that low priority does not imply low
importance.  A priority of "high" means a solution is needed as soon as
possible.  A priority of "medium" means the problem should be solved no
later than the next release.  A priority of "low" means the problem
should be solved in a future release, but it is not important to your
work how soon this happens.  The default priority is medium.

Note that a given severity does not necessarily imply a given priority.
For example, a non-critical problem might still have a high priority if
you are faced with a hard deadline.  Conversely, a serious problem might
have a low priority if the feature it is disabling is one that you do
not need.

It is important that you fill in the release field and tell us what
changes you have made, if any.

A sample filled-out form from a company named "Toasters, Inc." might
look like this:

     To: krb5-bugs@mit.edu
     Subject: misspelled "Kerberos" in title of installation guide
     From: jcb
     Reply-To: jcb
     Cc:
     X-send-pr-version: 3.99
     
     
     >Submitter-Id:	mit
     >Originator:	Jeffrey C. Gilman Bigler
     >Organization:
     mit
     >Confidential:	no
     >Synopsis:	Misspelled "Kerberos" in title of installation guide
     >Severity:	non-critical
     >Priority:	low
     >Category:	krb5-doc
     >Class:		doc-bug
     >Release:	1.0-development
     >Environment:
     	<machine, os, target, libraries (multiple lines)>
     System: ULTRIX imbrium 4.2 0 RISC
     Machine: mips
     >Description:
             Misspelled "Kerberos" in title of "Kerboros V5 Installation Guide"
     >How-To-Repeat:
             N/A
     >Fix:
             Correct the spelling.

If the `krb5-send-pr' program does not work for you, or if you did not
get far enough in the process to have an installed and working
`krb5-send-pr', you can generate your own form, using the above as an
example.


File: krb5-admin.info,  Node: Appendix,  Prev: Bug Reporting,  Up: Top

Appendix
********

* Menu:

* Errors::
* kadmin Time Zones::


File: krb5-admin.info,  Node: Errors,  Next: kadmin Time Zones,  Prev: Appendix,  Up: Appendix

Kerberos Error Messages
=======================

* Menu:

* Kerberos V5 Library Error Codes::
* Kerberos V5 Database Library Error Codes::
* Kerberos V5 Magic Numbers Error Codes::
* ASN.1 Error Codes::
* GSSAPI Error Codes::


File: krb5-admin.info,  Node: Kerberos V5 Library Error Codes,  Next: Kerberos V5 Database Library Error Codes,  Prev: Errors,  Up: Errors

Kerberos V5 Library Error Codes
-------------------------------

This is the Kerberos v5 library error code table.  Protocol error codes
are
ERROR_TABLE_BASE_krb5 + the protocol error code number; other error
codes start at ERROR_TABLE_BASE_krb5 + 128.

  0. KRB5KDC_ERR_NONE:  No error

  1. KRB5KDC_ERR_NAME_EXP:  Client's entry in database has expired

  2. KRB5KDC_ERR_SERVICE_EXP:  Server's entry in database has expired

  3. KRB5KDC_ERR_BAD_PVNO:  Requested protocol version not supported

  4. KRB5KDC_ERR_C_OLD_MAST_KVNO:  Client's key is encrypted in an old
     master key

  5. KRB5KDC_ERR_S_OLD_MAST_KVNO:  Server's key is encrypted in an old
     master key

  6. KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:  Client not found in Kerberos
     database

  7. KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:  Server not found in Kerberos
     database

  8. KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE:  Principal has multiple entries
     in Kerberos database

  9. KRB5KDC_ERR_NULL_KEY:  Client or server has a null key

 10. KRB5KDC_ERR_CANNOT_POSTDATE:  Ticket is ineligible for postdating

 11. KRB5KDC_ERR_NEVER_VALID:  Requested effective lifetime is negative
     or too short

 12. KRB5KDC_ERR_POLICY:  KDC policy rejects request

 13. KRB5KDC_ERR_BADOPTION:  KDC can't fulfill requested option

 14. KRB5KDC_ERR_ETYPE_NOSUPP:  KDC has no support for encryption type

 15. KRB5KDC_ERR_SUMTYPE_NOSUPP:  KDC has no support for checksum type

 16. KRB5KDC_ERR_PADATA_TYPE_NOSUPP:  KDC has no support for padata type

 17. KRB5KDC_ERR_TRTYPE_NOSUPP:  KDC has no support for transited type

 18. KRB5KDC_ERR_CLIENT_REVOKED:  Clients credentials have been revoked

 19. KRB5KDC_ERR_SERVICE_REVOKED:  Credentials for server have been
     revoked

 20. KRB5KDC_ERR_TGT_REVOKED:  TGT has been revoked

 21. KRB5KDC_ERR_CLIENT_NOTYET:  Client not yet valid - try again later

 22. KRB5KDC_ERR_SERVICE_NOTYET:  Server not yet valid - try again later

 23. KRB5KDC_ERR_KEY_EXP:  Password has expired

 24. KRB5KDC_ERR_PREAUTH_FAILED:  Preauthentication failed

 25. KRB5KDC_ERR_PREAUTH_REQUIRED:  Additional pre-authentication
     required

 26. KRB5KDC_ERR_SERVER_NOMATCH:  Requested server and ticket don't
     match

 27. KRB5PLACEHOLD_27:  KRB5 error code 27

 28. KRB5PLACEHOLD_28:  KRB5 error code 28

 29. KRB5PLACEHOLD_29:  KRB5 error code 29

 30. KRB5PLACEHOLD_30:  KRB5 error code 30

 31. KRB5KRB_AP_ERR_BAD_INTEGRITY:  Decrypt integrity check failed

 32. KRB5KRB_AP_ERR_TKT_EXPIRED:  Ticket expired

 33. KRB5KRB_AP_ERR_TKT_NYV:  Ticket not yet valid

 34. KRB5KRB_AP_ERR_REPEAT:  Request is a replay

 35. KRB5KRB_AP_ERR_NOT_US:  The ticket isn't for us

 36. KRB5KRB_AP_ERR_BADMATCH:  Ticket/authenticator don't match

 37. KRB5KRB_AP_ERR_SKEW:  Clock skew too great

 38. KRB5KRB_AP_ERR_BADADDR:  Incorrect net address

 39. KRB5KRB_AP_ERR_BADVERSION:  Protocol version mismatch

 40. KRB5KRB_AP_ERR_MSG_TYPE:  Invalid message type

 41. KRB5KRB_AP_ERR_MODIFIED:  Message stream modified

 42. KRB5KRB_AP_ERR_BADORDER:  Message out of order

 43. KRB5KRB_AP_ERR_ILL_CR_TKT:  Illegal cross-realm ticket

 44. KRB5KRB_AP_ERR_BADKEYVER:  Key version is not available

 45. KRB5KRB_AP_ERR_NOKEY:  Service key not available

 46. KRB5KRB_AP_ERR_MUT_FAIL:  Mutual authentication failed

 47. KRB5KRB_AP_ERR_BADDIRECTION:  Incorrect message direction

 48. KRB5KRB_AP_ERR_METHOD:  Alternative authentication method required

 49. KRB5KRB_AP_ERR_BADSEQ:  Incorrect sequence number in message

 50. KRB5KRB_AP_ERR_INAPP_CKSUM:  Inappropriate type of checksum in
     message

 51. KRB5KRB_AP_PATH_NOT_ACCEPTED: Policy rejects transited path

 52. KRB5KRB_ERR_RESPONSE_TOO_BIG: Response too big for UDP, retry with
     TCP

 53. KRB5PLACEHOLD_53:  KRB5 error code 53

 54. KRB5PLACEHOLD_54:  KRB5 error code 54

 55. KRB5PLACEHOLD_55:  KRB5 error code 55

 56. KRB5PLACEHOLD_56:  KRB5 error code 56

 57. KRB5PLACEHOLD_57:  KRB5 error code 57

 58. KRB5PLACEHOLD_58:  KRB5 error code 58

 59. KRB5PLACEHOLD_59:  KRB5 error code 59

 60. KRB5KRB_ERR_GENERIC:  Generic error (see e-text)

 61. KRB5KRB_ERR_FIELD_TOOLONG:  Field is too long for this
     implementation

 62. KRB5PLACEHOLD_62:  KRB5 error code 62

 63. KRB5PLACEHOLD_63:  KRB5 error code 63

 64. KRB5PLACEHOLD_64:  KRB5 error code 64

 65. KRB5PLACEHOLD_65:  KRB5 error code 65

 66. KRB5PLACEHOLD_66:  KRB5 error code 66

 67. KRB5PLACEHOLD_67:  KRB5 error code 67

 68. KRB5PLACEHOLD_68:  KRB5 error code 68

 69. KRB5PLACEHOLD_69:  KRB5 error code 69

 70. KRB5PLACEHOLD_70:  KRB5 error code 70

 71. KRB5PLACEHOLD_71:  KRB5 error code 71

 72. KRB5PLACEHOLD_72:  KRB5 error code 72

 73. KRB5PLACEHOLD_73:  KRB5 error code 73

 74. KRB5PLACEHOLD_74:  KRB5 error code 74

 75. KRB5PLACEHOLD_75:  KRB5 error code 75

 76. KRB5PLACEHOLD_76:  KRB5 error code 76

 77. KRB5PLACEHOLD_77:  KRB5 error code 77

 78. KRB5PLACEHOLD_78:  KRB5 error code 78

 79. KRB5PLACEHOLD_79:  KRB5 error code 79

 80. KRB5PLACEHOLD_80:  KRB5 error code 80

 81. KRB5PLACEHOLD_81:  KRB5 error code 81

 82. KRB5PLACEHOLD_82:  KRB5 error code 82

 83. KRB5PLACEHOLD_83:  KRB5 error code 83

 84. KRB5PLACEHOLD_84:  KRB5 error code 84

 85. KRB5PLACEHOLD_85:  KRB5 error code 85

 86. KRB5PLACEHOLD_86:  KRB5 error code 86

 87. KRB5PLACEHOLD_87:  KRB5 error code 87

 88. KRB5PLACEHOLD_88:  KRB5 error code 88

 89. KRB5PLACEHOLD_89:  KRB5 error code 89

 90. KRB5PLACEHOLD_90:  KRB5 error code 90

 91. KRB5PLACEHOLD_91:  KRB5 error code 91

 92. KRB5PLACEHOLD_92:  KRB5 error code 92

 93. KRB5PLACEHOLD_93:  KRB5 error code 93

 94. KRB5PLACEHOLD_94:  KRB5 error code 94

 95. KRB5PLACEHOLD_95:  KRB5 error code 95

 96. KRB5PLACEHOLD_96:  KRB5 error code 96

 97. KRB5PLACEHOLD_97:  KRB5 error code 97

 98. KRB5PLACEHOLD_98:  KRB5 error code 98

 99. KRB5PLACEHOLD_99:  KRB5 error code 99

100. KRB5PLACEHOLD_100:  KRB5 error code 100

101. KRB5PLACEHOLD_101:  KRB5 error code 101

102. KRB5PLACEHOLD_102:  KRB5 error code 102

103. KRB5PLACEHOLD_103:  KRB5 error code 103

104. KRB5PLACEHOLD_104:  KRB5 error code 104

105. KRB5PLACEHOLD_105:  KRB5 error code 105

106. KRB5PLACEHOLD_106:  KRB5 error code 106

107. KRB5PLACEHOLD_107:  KRB5 error code 107

108. KRB5PLACEHOLD_108:  KRB5 error code 108

109. KRB5PLACEHOLD_109:  KRB5 error code 109

110. KRB5PLACEHOLD_110:  KRB5 error code 110

111. KRB5PLACEHOLD_111:  KRB5 error code 111

112. KRB5PLACEHOLD_112:  KRB5 error code 112

113. KRB5PLACEHOLD_113:  KRB5 error code 113

114. KRB5PLACEHOLD_114:  KRB5 error code 114

115. KRB5PLACEHOLD_115:  KRB5 error code 115

116. KRB5PLACEHOLD_116:  KRB5 error code 116

117. KRB5PLACEHOLD_117:  KRB5 error code 117

118. KRB5PLACEHOLD_118:  KRB5 error code 118

119. KRB5PLACEHOLD_119:  KRB5 error code 119

120. KRB5PLACEHOLD_120:  KRB5 error code 120

121. KRB5PLACEHOLD_121:  KRB5 error code 121

122. KRB5PLACEHOLD_122:  KRB5 error code 122

123. KRB5PLACEHOLD_123:  KRB5 error code 123

124. KRB5PLACEHOLD_124:  KRB5 error code 124

125. KRB5PLACEHOLD_125:  KRB5 error code 125

126. KRB5PLACEHOLD_126:  KRB5 error code 126

127. KRB5PLACEHOLD_127:  KRB5 error code 127

128. KRB5_ERR_RCSID:  (RCS Id string for the krb5 error table)

129. KRB5_LIBOS_BADLOCKFLAG:  Invalid flag for file lock mode

130. KRB5_LIBOS_CANTREADPWD:  Cannot read password

131. KRB5_LIBOS_BADPWDMATCH:  Password mismatch

132. KRB5_LIBOS_PWDINTR:  Password read interrupted

133. KRB5_PARSE_ILLCHAR:  Illegal character in component name

134. KRB5_PARSE_MALFORMED:  Malformed representation of principal

135. KRB5_CONFIG_CANTOPEN:  Can't open/find Kerberos configuration file

136. KRB5_CONFIG_BADFORMAT:  Improper format of Kerberos configuration
     file

137. KRB5_CONFIG_NOTENUFSPACE:  Insufficient space to return complete
     information

138. KRB5_BADMSGTYPE:  Invalid message type specified for encoding

139. KRB5_CC_BADNAME:  Credential cache name malformed

140. KRB5_CC_UNKNOWN_TYPE:  Unknown credential cache type

141. KRB5_CC_NOTFOUND:  Matching credential not found

142. KRB5_CC_END:  End of credential cache reached

143. KRB5_NO_TKT_SUPPLIED:  Request did not supply a ticket

144. KRB5KRB_AP_WRONG_PRINC:  Wrong principal in request

145. KRB5KRB_AP_ERR_TKT_INVALID:  Ticket has invalid flag set

146. KRB5_PRINC_NOMATCH:  Requested principal and ticket don't match

147. KRB5_KDCREP_MODIFIED:  KDC reply did not match expectations

148. KRB5_KDCREP_SKEW:  Clock skew too great in KDC reply

149. KRB5_IN_TKT_REALM_MISMATCH:  Client/server realm mismatch in
     initial ticket request

150. KRB5_PROG_ETYPE_NOSUPP:  Program lacks support for encryption type

151. KRB5_PROG_KEYTYPE_NOSUPP:  Program lacks support for key type

152. KRB5_WRONG_ETYPE:  Requested encryption type not used in message

153. KRB5_PROG_SUMTYPE_NOSUPP:  Program lacks support for checksum type

154. KRB5_REALM_UNKNOWN:  Cannot find KDC for requested realm

155. KRB5_SERVICE_UNKNOWN:  Kerberos service unknown

156. KRB5_KDC_UNREACH:  Cannot contact any KDC for requested realm

157. KRB5_NO_LOCALNAME:  No local name found for principal name

158. KRB5_MUTUAL_FAILED:  Mutual authentication failed

159. KRB5_RC_TYPE_EXISTS:  Replay cache type is already registered

160. KRB5_RC_MALLOC:  No more memory to allocate (in replay cache code)

161. KRB5_RC_TYPE_NOTFOUND:  Replay cache type is unknown

162. KRB5_RC_UNKNOWN:  Generic unknown RC error

163. KRB5_RC_REPLAY:  Message is a replay

164. KRB5_RC_IO:  Replay I/O operation failed XXX

165. KRB5_RC_NOIO:  Replay cache type does not support non-volatile
     storage

166. KRB5_RC_PARSE:  Replay cache name parse/format error

167. KRB5_RC_IO_EOF:  End-of-file on replay cache I/O

168. KRB5_RC_IO_MALLOC:  No more memory to allocate (in replay cache I/O
     code)

169. KRB5_RC_IO_PERM:  Permission denied in replay cache code

170. KRB5_RC_IO_IO:  I/O error in replay cache i/o code

171. KRB5_RC_IO_UNKNOWN:  Generic unknown RC/IO error

172. KRB5_RC_IO_SPACE:  Insufficient system space to store replay
     information

173. KRB5_TRANS_CANTOPEN:  Can't open/find realm translation file

174. KRB5_TRANS_BADFORMAT:  Improper format of realm translation file

175. KRB5_LNAME_CANTOPEN:  Can't open/find lname translation database

176. KRB5_LNAME_NOTRANS:  No translation available for requested
     principal

177. KRB5_LNAME_BADFORMAT:  Improper format of translation database
     entry

178. KRB5_CRYPTO_INTERNAL:  Cryptosystem internal error

179. KRB5_KT_BADNAME:  Key table name malformed

180. KRB5_KT_UNKNOWN_TYPE:  Unknown Key table type

181. KRB5_KT_NOTFOUND:  Key table entry not found

182. KRB5_KT_END:  End of key table reached

183. KRB5_KT_NOWRITE:  Cannot write to specified key table

184. KRB5_KT_IOERR:  Error writing to key table

185. KRB5_NO_TKT_IN_RLM:  Cannot find ticket for requested realm

186. KRB5DES_BAD_KEYPAR:  DES key has bad parity

187. KRB5DES_WEAK_KEY:  DES key is a weak key

188. KRB5_BAD_ENCTYPE:  Bad encryption type

189. KRB5_BAD_KEYSIZE:  Key size is incompatible with encryption type

190. KRB5_BAD_MSIZE:  Message size is incompatible with encryption type

191. KRB5_CC_TYPE_EXISTS:  Credentials cache type is already registered.

192. KRB5_KT_TYPE_EXISTS:  Key table type is already registered.

193. KRB5_CC_IO:  Credentials cache I/O operation failed XXX

194. KRB5_FCC_PERM:  Credentials cache file permissions incorrect

195. KRB5_FCC_NOFILE:  No credentials cache found

196. KRB5_FCC_INTERNAL:  Internal credentials cache error

197. KRB5_CC_WRITE:  Error writing to credentials cache

198. KRB5_CC_NOMEM:  No more memory to allocate (in credentials cache
     code)

199. KRB5_CC_FORMAT:  Bad format in credentials cache

200. KRB5_INVALID_FLAGS:  Invalid KDC option combination (library
     internal error) [for dual tgt library calls]

201. KRB5_NO_2ND_TKT:  Request missing second ticket [for dual tgt
     library calls]

202. KRB5_NOCREDS_SUPPLIED:  No credentials supplied to library routine

203. KRB5_SENDAUTH_BADAUTHVERS:  Bad sendauth version was sent

204. KRB5_SENDAUTH_BADAPPLVERS:  Bad application version was sent (via
     sendauth)

205. KRB5_SENDAUTH_BADRESPONSE:  Bad response (during sendauth exchange)

206. KRB5_SENDAUTH_REJECTED:  Server rejected authentication (during
     sendauth exchange)

207. KRB5_PREAUTH_BAD_TYPE:  Unsupported preauthentication type

208. KRB5_PREAUTH_NO_KEY:  Required preauthentication key not supplied

209. KRB5_PREAUTH_FAILED:  Generic preauthentication failure

210. KRB5_RCACHE_BADVNO:  Unsupported replay cache format version number

211. KRB5_CCACHE_BADVNO:  Unsupported credentials cache format version
     number

212. KRB5_KEYTAB_BADVNO:  Unsupported key table format version number

213. KRB5_PROG_ATYPE_NOSUPP:  Program lacks support for address type

214. KRB5_RC_REQUIRED:  Message replay detection requires rcache
     parameter

215. KRB5_ERR_BAD_HOSTNAME:  Hostname cannot be canonicalized

216. KRB5_ERR_HOST_REALM_UNKNOWN:  Cannot determine realm for host

217. KRB5_SNAME_UNSUPP_NAMETYPE:  Conversion to service principal
     undefined for name type

218. KRB5KRB_AP_ERR_V4_REPLY:  Initial Ticket response appears to be
     Version 4 error

219. KRB5_REALM_CANT_RESOLVE:  Cannot resolve KDC for requested realm

220. KRB5_TKT_NOT_FORWARDABLE:  Requesting ticket can't get forwardable
     tickets

221. KRB5_FWD_BAD_PRINCIPAL:  Bad principal name while trying to forward
     credentials

222. KRB5_GET_IN_TKT_LOOP:  Looping detected inside krb5_get_in_tkt

223. KRB5_CONFIG_NODEFREALM:  Configuration file does not specify
     default realm

224. KRB5_SAM_UNSUPPORTED:  Bad SAM flags in obtain_sam_padata

225. KRB5_KT_NAME_TOOLONG: Keytab name too long

226. KRB5_KT_KVNONOTFOUND: Key version number for principal in key
     table is incorrect

227. KRB5_APPL_EXPIRED: This application has expired

228. KRB5_LIB_EXPIRED: This Krb5 library has expired

229. KRB5_CHPW_PWDNULL: New password cannot be zero length

230. KRB5_CHPW_FAIL: Password change failed

231. KRB5_KT_FORMAT: Bad format in keytab

232. KRB5_NOPERM_ETYPE: Encryption type not permitted

233. KRB5_CONFIG_ETYPE_NOSUPP: No supported encryption types (config
     file error?)

234. KRB5_OBSOLETE_FN: Program called an obsolete, deleted function

235. KRB5_EAI_FAIL: unknown getaddrinfo failure

236. KRB5_EAI_NODATA: no data available for host/domain name

237. KRB5_EAI_NONAME: host/domain name not found

238. KRB5_EAI_SERVICE: service name unknown

239. KRB5_ERR_NUMERIC_REALM: Cannot determine realm for numeric host
     address


File: krb5-admin.info,  Node: Kerberos V5 Database Library Error Codes,  Next: Kerberos V5 Magic Numbers Error Codes,  Prev: Kerberos V5 Library Error Codes,  Up: Errors

Kerberos V5 Database Library Error Codes
----------------------------------------

This is the Kerberos v5 database library error code table.

  0. KRB5_KDB_RCSID:  (RCS Id string for the kdb error table)

  1. KRB5_KDB_INUSE:  Entry already exists in database

  2. KRB5_KDB_UK_SERROR:  Database store error

  3. KRB5_KDB_UK_RERROR:  Database read error

  4. KRB5_KDB_UNAUTH:  Insufficient access to perform requested
     operation

  5. KRB5_KDB_NOENTRY:  No such entry in the database

  6. KRB5_KDB_ILL_WILDCARD:  Illegal use of wildcard

  7. KRB5_KDB_DB_INUSE:  Database is locked or in use-try again later

  8. KRB5_KDB_DB_CHANGED:  Database was modified during read

  9. KRB5_KDB_TRUNCATED_RECORD:  Database record is incomplete or
     corrupted

 10. KRB5_KDB_RECURSIVELOCK:  Attempt to lock database twice

 11. KRB5_KDB_NOTLOCKED:  Attempt to unlock database when not locked

 12. KRB5_KDB_BADLOCKMODE:  Invalid kdb lock mode

 13. KRB5_KDB_DBNOTINITED:  Database has not been initialized

 14. KRB5_KDB_DBINITED:  Database has already been initialized

 15. KRB5_KDB_ILLDIRECTION:  Bad direction for converting keys

 16. KRB5_KDB_NOMASTERKEY:  Cannot find master key record in database

 17. KRB5_KDB_BADMASTERKEY:  Master key does not match database

 18. KRB5_KDB_INVALIDKEYSIZE:  Key size in database is invalid

 19. KRB5_KDB_CANTREAD_STORED:  Cannot find/read stored master key

 20. KRB5_KDB_BADSTORED_MKEY:  Stored master key is corrupted

 21. KRB5_KDB_CANTLOCK_DB:  Insufficient access to lock database

 22. KRB5_KDB_DB_CORRUPT:  Database format error

 23. KRB5_KDB_BAD_VERSION:  Unsupported version in database entry

 24. KRB5_KDB_BAD_SALTTYPE:  Unsupported salt type

 25. KRB5_KDB_BAD_ENCTYPE:  Unsupported encryption type

 26. KRB5_KDB_BAD_CREATEFLAGS: Bad database creation flags

 27. KRB5_KDB_NO_PERMITTED_KEY: No matching key in entry having a
     permitted enc type

 28. KRB5_KDB_NO_MATCHING_KEY: No matching key in entry


File: krb5-admin.info,  Node: Kerberos V5 Magic Numbers Error Codes,  Next: ASN.1 Error Codes,  Prev: Kerberos V5 Database Library Error Codes,  Up: Errors

Kerberos V5 Magic Numbers Error Codes
-------------------------------------

This is the Kerberos v5 magic numbers error code table.

  0. KV5M_NONE:  Kerberos V5 magic number table

  1. KV5M_PRINCIPAL:  Bad magic number for krb5_principal structure

  2. KV5M_DATA:  Bad magic number for krb5_data structure

  3. KV5M_KEYBLOCK:  Bad magic number for krb5_keyblock structure

  4. KV5M_CHECKSUM:  Bad magic number for krb5_checksum structure

  5. KV5M_ENCRYPT_BLOCK:  Bad magic number for krb5_encrypt_block
     structure

  6. KV5M_ENC_DATA:  Bad magic number for krb5_enc_data structure

  7. KV5M_CRYPTOSYSTEM_ENTRY:  Bad magic number for
     krb5_cryptosystem_entry structure

  8. KV5M_CS_TABLE_ENTRY:  Bad magic number for krb5_cs_table_entry
     structure

  9. KV5M_CHECKSUM_ENTRY:  Bad magic number for krb5_checksum_entry
     structure

 10. KV5M_AUTHDATA:  Bad magic number for krb5_authdata structure

 11. KV5M_TRANSITED:  Bad magic number for krb5_transited structure

 12. KV5M_ENC_TKT_PART:  Bad magic number for krb5_enc_tkt_part
     structure

 13. KV5M_TICKET:  Bad magic number for krb5_ticket structure

 14. KV5M_AUTHENTICATOR:  Bad magic number for krb5_authenticator
     structure

 15. KV5M_TKT_AUTHENT:  Bad magic number for krb5_tkt_authent structure

 16. KV5M_CREDS:  Bad magic number for krb5_creds structure

 17. KV5M_LAST_REQ_ENTRY:  Bad magic number for krb5_last_req_entry
     structure

 18. KV5M_PA_DATA:  Bad magic number for krb5_pa_data structure

 19. KV5M_KDC_REQ:  Bad magic number for krb5_kdc_req structure

 20. KV5M_ENC_KDC_REP_PART:  Bad magic number for
     krb5_enc_kdc_rep_part structure

 21. KV5M_KDC_REP:  Bad magic number for krb5_kdc_rep structure

 22. KV5M_ERROR:  Bad magic number for krb5_error structure

 23. KV5M_AP_REQ:  Bad magic number for krb5_ap_req structure

 24. KV5M_AP_REP:  Bad magic number for krb5_ap_rep structure

 25. KV5M_AP_REP_ENC_PART:  Bad magic number for
     krb5_ap_rep_enc_part structure

 26. KV5M_RESPONSE:  Bad magic number for krb5_response structure

 27. KV5M_SAFE:  Bad magic number for krb5_safe structure

 28. KV5M_PRIV:  Bad magic number for krb5_priv structure

 29. KV5M_PRIV_ENC_PART:  Bad magic number for krb5_priv_enc_part
     structure

 30. KV5M_CRED:  Bad magic number for krb5_cred structure

 31. KV5M_CRED_INFO:  Bad magic number for krb5_cred_info structure

 32. KV5M_CRED_ENC_PART:  Bad magic number for krb5_cred_enc_part
     structure

 33. KV5M_PWD_DATA:  Bad magic number for krb5_pwd_data structure

 34. KV5M_ADDRESS:  Bad magic number for krb5_address structure

 35. KV5M_KEYTAB_ENTRY:  Bad magic number for krb5_keytab_entry
     structure

 36. KV5M_CONTEXT:  Bad magic number for krb5_context structure

 37. KV5M_OS_CONTEXT:  Bad magic number for krb5_os_context structure

 38. KV5M_ALT_METHOD:  Bad magic number for krb5_alt_method structure

 39. KV5M_ETYPE_INFO_ENTRY:  Bad magic number for
     krb5_etype_info_entry structure

 40. KV5M_DB_CONTEXT:  Bad magic number for krb5_db_context structure

 41. KV5M_AUTH_CONTEXT:  Bad magic number for krb5_auth_context
     structure

 42. KV5M_KEYTAB:  Bad magic number for krb5_keytab structure

 43. KV5M_RCACHE:  Bad magic number for krb5_rcache structure

 44. KV5M_CCACHE:  Bad magic number for krb5_ccache structure

 45. KV5M_PREAUTH_OPS:  Bad magic number for krb5_preauth_ops

 46. KV5M_SAM_CHALLENGE:  Bad magic number for krb5_sam_challenge

 47. KV5M_SAM_KEY:  Bad magic number for krb5_sam_key

 48. KV5M_ENC_SAM_RESPONSE_ENC:  Bad magic number for
     krb5_enc_sam_response_enc

 49. KV5M_SAM_RESPONSE:  Bad magic number for krb5_sam_response

 50. KV5M_PREDICTED_SAM_RESPONSE:  Bad magic number for
     krb5_predicted_sam_response

 51. KV5M_PASSWD_PHRASE_ELEMENT:  Bad magic number for
     passwd_phrase_element

 52. KV5M_GSS_OID: Bad magic number for GSSAPI OID

 53. KV5M_GSS_QUEUE: Bad magic number for GSSAPI QUEUE


File: krb5-admin.info,  Node: ASN.1 Error Codes,  Next: GSSAPI Error Codes,  Prev: Kerberos V5 Magic Numbers Error Codes,  Up: Errors

ASN.1 Error Codes
-----------------

  0. ASN1_BAD_TIMEFORMAT:  ASN.1 failed call to system time library

  1. ASN1_MISSING_FIELD:  ASN.1 structure is missing a required field

  2. ASN1_MISPLACED_FIELD:  ASN.1 unexpected field number

  3. ASN1_TYPE_MISMATCH:  ASN.1 type numbers are inconsistent

  4. ASN1_OVERFLOW:  ASN.1 value too large

  5. ASN1_OVERRUN:  ASN.1 encoding ended unexpectedly

  6. ASN1_BAD_ID:  ASN.1 identifier doesn't match expected value

  7. ASN1_BAD_LENGTH:  ASN.1 length doesn't match expected value

  8. ASN1_BAD_FORMAT:  ASN.1 badly-formatted encoding

  9. ASN1_PARSE_ERROR:  ASN.1 parse error

 10. ASN1_BAD_GMTIME: ASN.1 bad return from gmtime

 11. ASN1_MISMATCH_INDEF: ASN.1 non-constructed indefinite encoding

 12. ASN1_MISSING_EOC: ASN.1 missing expected EOC


File: krb5-admin.info,  Node: GSSAPI Error Codes,  Prev: ASN.1 Error Codes,  Up: Errors

GSSAPI Error Codes
------------------

Generic GSSAPI Errors:

  0. G_BAD_SERVICE_NAME:  No  in SERVICE-NAME name string

  1. G_BAD_STRING_UID: STRING-UID-NAME contains nondigits

  2. G_NOUSER:  UID does not resolve to username

  3. G_VALIDATE_FAILED:  Validation error

  4. G_BUFFER_ALLOC:  Couldn't allocate gss_buffer_t data

  5. G_BAD_MSG_CTX:  Message context invalid

  6. G_WRONG_SIZE:  Buffer is the wrong size

  7. G_BAD_USAGE:  Credential usage type is unknown

  8. G_UNKNOWN_QOP:  Unknown quality of protection specified

  9. G_BAD_HOSTNAME:  Hostname in SERVICE-NAME string could not be
     canonicalized

 10. G_WRONG_MECH: Mechanism is incorrect

 11. G_BAD_TOK_HEADER: Token header is malformed or corrupt

 12. G_BAD_DIRECTION: Packet was replayed in wrong direction

 13. G_TOK_TRUNC: Token is missing data

 14. G_REFLECT: Token was reflected

 15. G_WRONG_TOKID: Received token ID does not match expected token ID

Kerberos 5 GSSAPI Errors:

  0. KG_CCACHE_NOMATCH:  Principal in credential cache does not match
     desired name

  1. KG_KEYTAB_NOMATCH:  No principal in keytab matches desired name

  2. KG_TGT_MISSING:  Credential cache has no TGT

  3. KG_NO_SUBKEY:  Authenticator has no subkey

  4. KG_CONTEXT_ESTABLISHED:  Context is already fully established

  5. KG_BAD_SIGN_TYPE:  Unknown signature type in token

  6. KG_BAD_LENGTH:  Invalid field length in token

  7. KG_CTX_INCOMPLETE:  Attempt to use incomplete security context

  8. KG_CONTEXT:  Bad magic number for krb5_gss_ctx_id_t

  9. KG_CRED:  Bad magic number for krb5_gss_cred_id_t

 10. KG_ENC_DESC:  Bad magic number for krb5_gss_enc_desc

 11. KG_BAD_SEQ: Sequence number in token is corrupt

 12. KG_EMPTY_CCACHE: Credential cache is empty

 13. KG_NO_CTYPES: Acceptor and Initiator share no checksum types


File: krb5-admin.info,  Node: kadmin Time Zones,  Prev: Errors,  Up: Appendix

kadmin Time Zones
=================

This is a complete listing of the time zones recognized by the `kadmin'
command.

gmt
     Greenwich Mean Time

ut, utc
     Universal Time (Coordinated).

wet
     Western European Time.  (Same as GMT.)

bst
     British Summer Time.  (1 hour ahead of GMT.)

wat
     West Africa Time.  (1 hour behind GMT.)

at
     Azores Time.  (2 hours behind GMT.)

bst
     Brazil Standard Time.  (3 hours behind GMT.)  Note that the
     abbreviation BST also stands for British Summer Time.

gst
     Greenland Standard Time.  (3 hours behind GMT.)  Note that the
     abbreviation GST also stands for Guam Standard Time.

nft
     Newfoundland Time.  (3.5 hours behind GMT.)

nst
     Newfoundland Standard Time.  (3.5 hours behind GMT.)

ndt
     Newfoundland Daylight Time.  (2.5 hours behind GMT.)

ast
     Atlantic Standard Time.  (4 hours behind GMT.)

adt
     Atlantic Daylight Time.  (3 hours behind GMT.)

est
     Eastern Standard Time.  (5 hours behind GMT.)

edt
     Eastern Daylight Time.  (4 hours behind GMT.)

cst
     Central Standard Time.  (6 hours behind GMT.)

cdt
     Central Daylight Time.  (5 hours behind GMT.)

mst
     Mountain Standard Time.  (7 hours behind GMT.)

mdt
     Mountain Daylight Time.  (6 hours behind GMT.)

pst
     Pacific Standard Time.  (8 hours behind GMT.)

pdt
     Pacific Daylight Time.  (7 hours behind GMT.)

yst
     Yukon Standard Time.  (9 hours behind GMT.)

ydt
     Yukon Daylight Time.  (8 hours behind GMT.)

hst
     Hawaii Standard Time.  (10 hours behind GMT.)

hdt
     Hawaii Daylight Time.  (9 hours behind GMT.)

cat
     Central Alaska Time.  (10 hours behind GMT.)

ahst
     Alaska-Hawaii Standard Time.  (10 hours behind GMT.)

nt
     Nome Time.  (11 hours behind GMT.)

idlw
     International Date Line West Time.  (12 hours behind GMT.)

cet
     Central European Time.  (1 hour ahead of GMT.)

met
     Middle European Time.  (1 hour ahead of GMT.)

mewt
     Middle European Winter Time.  (1 hour ahead of GMT.)

mest
     Middle European Summer Time.  (2 hours ahead of GMT.)

swt
     Swedish Winter Time.  (1 hour ahead of GMT.)

sst
     Swedish Summer Time.  (1 hours ahead of GMT.)

fwt
     French Winter Time.  (1 hour ahead of GMT.)

fst
     French Summer Time.  (2 hours ahead of GMT.)

eet
     Eastern Europe Time; Russia Zone 1.  (2 hours ahead of GMT.)

bt
     Baghdad Time; Russia Zone 2.  (3 hours ahead of GMT.)

it
     Iran Time.  (3.5 hours ahead of GMT.)

zp4
     Russia Zone 3.  (4 hours ahead of GMT.)

zp5
     Russia Zone 4.  (5 hours ahead of GMT.)

ist
     Indian Standard Time.  (5.5 hours ahead of GMT.)

zp6
     Russia Zone 5.  (6 hours ahead of GMT.)

nst
     North Sumatra Time.  (6.5 hours ahead of GMT.)  Note that the
     abbreviation NST is also used for Newfoundland Stanard Time.

sst
     South Sumatra Time; Russia Zone 6.  (7 hours ahead of GMT.)  Note
     that SST is also Swedish Summer Time.

wast
     West Australian Standard Time.  (7 hours ahead of GMT.)

wadt
     West Australian Daylight Time.  (8 hours ahead of GMT.)

jt
     Java Time.  (7.5 hours ahead of GMT.)

cct
     China Coast Time; Russia Zone 7.  (8 hours ahead of GMT.)

jst
     Japan Standard time; Russia Zone 8.  (9 hours ahead of GMT.)

kst
     Korean Standard Time.  (9 hours ahead of GMT.)

cast
     Central Australian Standard Time.  (9.5 hours ahead of GMT.)

cadt
     Central Australian Daylight Time.  (10.5 hours ahead of GMT.)

east
     Eastern Australian Standard Time.  (10 hours ahead of GMT.)

eadt
     Eastern Australian Daylight Time.  (11 hours ahead of GMT.)

gst
     Guam Standard Time; Russia Zone 9.  (10 hours ahead of GMT.)

kdt
     Korean Daylight Time.  (10 hours ahead of GMT.)

nzt
     New Zealand Time.  (12 hours ahead of GMT.)

nzst
     New Zealand Standard Time.  (12 hours ahead of GMT.)

nzdt
     New Zealand Daylight Time.  (13 hours ahead of GMT.)

idle
     International Date Line East.  (12 hours ahead of GMT.)



Tag Table:
Node: Top223
Node: Copyright603
Node: Introduction8108
Node: Why Should I use Kerberos?8338
Node: Documentation for Kerberos V58951
Node: Overview of This Guide10144
Node: How Kerberos Works10886
Node: Network Services and Their Client Programs11906
Node: Kerberos Tickets12490
Node: The Kerberos Database13302
Node: Kerberos Realms13786
Node: The Ticket-Granting Ticket14691
Node: Network Services and the Master Database15596
Node: The Keytab File16991
Ref: The Keytab File-Footnote-117778
Node: The User/Kerberos Interaction17829
Node: Definitions20594
Node: Configuration Files23032
Node: Supported Encryption Types23259
Node: Salts24939
Node: krb5.conf25721
Node: libdefaults28276
Node: appdefaults35643
Node: login37797
Node: realms (krb5.conf)39182
Node: domain_realm44300
Node: logging45549
Node: capaths48141
Node: Sample krb5.conf File51163
Node: kdc.conf52395
Node: kdcdefaults53417
Node: realms (kdc.conf)54687
Node: Sample kdc.conf File62449
Node: Using DNS63114
Node: Mapping Hostnames onto Kerberos Realms63337
Node: Hostnames for KDCs65414
Node: Administrating the Kerberos Database70024
Node: Kadmin Options72477
Node: Date Format74747
Node: Principals76388
Node: Retrieving Information About a Principal76840
Node: Attributes77113
Node: Retrieving a List of Principals78867
Node: Privileges79717
Node: Adding or Modifying Principals83968
Ref: Adding or Modifying Principals-Footnote-192132
Node: Deleting Principals92267
Node: Changing Passwords93036
Node: Policies94658
Node: Retrieving Policies95198
Node: Retrieving the List of Policies96186
Node: Adding or Modifying Policies96984
Node: Deleting Policies98087
Node: Global Operations on the Kerberos Database98791
Node: Dumping a Kerberos Database to a File100148
Node: Restoring a Kerberos Database from a Dump File102830
Node: Creating a Stash File104573
Node: Creating and Destroying a Kerberos Database105456
Node: Cross-realm Authentication107209
Node: Application Servers108902
Node: Keytabs109631
Node: Adding Principals to Keytabs110456
Node: Removing Principals from Keytabs112631
Node: Clock Skew113831
Node: Getting DNS Information Correct114893
Node: Configuring Your Firewall to Work With Kerberos V5116635
Node: Backups of Secure Hosts120884
Node: Backing Up the Kerberos Database121713
Node: Bug Reporting122908
Node: Appendix127689
Node: Errors127825
Node: Kerberos V5 Library Error Codes128150
Node: Kerberos V5 Database Library Error Codes142810
Node: Kerberos V5 Magic Numbers Error Codes144949
Node: ASN.1 Error Codes149038
Node: GSSAPI Error Codes149975
Node: kadmin Time Zones151884

End Tag Table
