Kerberos Options for DHCPv6
RFC 6784

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Internet Engineering Task Force (IETF)                         S. Sakane
Request for Comments: 6784                                 Cisco Systems
Category: Standards Track                                    M. Ishiyama
ISSN: 2070-1721                                      Toshiba Corporation
                                                           November 2012

                      Kerberos Options for DHCPv6

Abstract

   This document defines four new options for the Dynamic Host
   Configuration Protocol for IPv6 (DHCPv6).  These options are used to
   carry configuration information for Kerberos.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6784.

Sakane & Ishiyama            Standards Track                    [Page 1]
RFC 6784               Kerberos Options for DHCPv6         November 2012

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................4
   3. Kerberos Options ................................................4
      3.1. Kerberos Principal Name Option .............................4
      3.2. Kerberos Realm Name Option .................................5
      3.3. Kerberos Default Realm Name Option .........................6
      3.4. Kerberos KDC Option ........................................6
   4. Client and Server Operation .....................................7
      4.1. KDC Discovery for a Client .................................8
   5. IANA Considerations .............................................8
   6. Security Considerations .........................................9
   7. Acknowledgments .................................................9
   8. References .....................................................10
      8.1. Normative References ......................................10
      8.2. Informative References ....................................10
   Appendix A. An Example of the Operation of the Client .............11

Sakane & Ishiyama            Standards Track                    [Page 2]
RFC 6784               Kerberos Options for DHCPv6         November 2012

1.  Introduction

   Kerberos Version 5 [RFC4120] is a trusted third-party authentication
   system.  Each organization wishing to use Kerberos establishes its
   own "realm", and each client is registered as part of that realm.  At
   least one Key Distribution Center (KDC) is required for the operation
   of a Kerberos realm.

   When a client wishes to communicate with, and be authenticated to, a
   Kerberos application server (also a client of the KDC), the client
   identifies itself, and its realm, to the KDC and acquires a
   credential from the KDC.  The client then presents the credential to
   the Kerberos application server, which can use the credential to
   authenticate the client.  The client needs to know at least one IP
   address for a KDC in order to initiate this process.

   One example of the application of this protocol is as follows.  A
   student might want to use a shared, public workstation, one that is