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Versions: 00 01 02 03 04 RFC 3634

INTERNET-DRAFT                                          K. Luehrs
Dynamic Host Configuration Working Group                CableLabs
Expires August 2003                                     R. Woundy
                                                        Comcast Cable
                                                        J. Bevilacqua
                                                        YAS Corporation
                                                        February 2003


                KDC Server Address Sub-option
         <draft-ietf-dhc-suboptions-kdc-serveraddress-03.txt>

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six
   months and may be updated, replaced, or obsoleted by other documents
   at any time.  It is inappropriate to use Internet-Drafts as
   reference material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

Copyright Notice

   Copyright (C) The Internet Society (2003). All Rights Reserved.

Abstract

   This document defines a new sub-option for the CableLabs Client
   Configuration (CCC) DHCP option code for conveying the network
   addresses of Key Distribution Center (KDC) servers.

1.  Introduction

   A CCC DHCP Option code providing the KDC server address will be
   needed for CableHome-compliant residential gateways configured to
   use Kerberos for authentication as the first step in establishing
   a secure SNMPv3 link between the PS and the SNMP entity in the
   cable operator's data network.

   The CCC DHCP option code will be used to address specific needs of
   CableLabs client devices during their configuration processes. This
   document proposes a sub-option for the CCC DHCP option.



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   Configuration of a class of CableLabs client devices described in
   [2] will require a DHCP sub-option to provide the client with the
   network address of a KDC server in the cable operator's data
   network. The class of devices assumed in [2] is unlike the class
   of devices considered in [1], which perform a DNS lookup of the
   Kerberos Realm name to find the KDC server network address.

   This document proposes a sub-option of the CCC DHCP option
   code for use with CableLabs client devices. The proposed sub-option
   encodes an identifier for the network address of each of one or more
   Key Distribution Center servers with which the CableLabs client
   device exchanges security information.

   The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY"
   in this document are to be interpreted as described in RFC 2119 [3].


2.  Key Distribution Center IP Address Sub-option

   CableHome specifications will specify the Key Distribution
   Center network address encoding as a sub-option of the CCC DHCP
   Option code. This field will be used to inform the client device of
   the network address of one or more Key Distribution Center servers.

   The encoding of the KDC Server Address sub-option will adhere to the
   format of an IPv4 address. The minimum length for this option is 4
   octets, and the length MUST always be a multiple of 4. If multiple
   KDC Servers are listed, they MUST be listed in decreasing order of
   priority. The format of the KDC Server Address sub-option of the CCC
   option code is as shown below:

    SubOpt  Len      Address 1               Address 2
   +------+-----+-----+-----+-----+-----+-----+-----+--
   |  TBD |  n  |  a1 |  a2 |  a3 |  a4 |  a1 |  a2 |  ...
   +------+-----+-----+-----+-----+-----+-----+-----+--


3.  Security Considerations

   This document relies upon the DHCP protocol [4] for authentication
   and security, i.e., it does not provide security in excess of what
   DHCP is (or will be) providing. It does not expose any security
   threats beyond what is currently exposed by other DHCP options.






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Internet Draft    KDC Server Address Sub-option       February 2003


4.  IANA Considerations

   The KDC Server Address sub-option described in this document is
   intended to be a sub-option of the CableLabs Client Configuration
   (CCC) option described in [1]. IANA is requested to assign and
   register a sub-option code of the CCC option to the KDC Server
   Address sub-option.

5.  Normative References


   [1] "DHCP Option for CableLabs Client Configuration  draft-ietf-dhc-
        packetcable-06", IETF, February 2003.

   [2] "CableHome 1.0 Specification SP-CH1.0-I03-030124", CableLabs,
        January 2003, http://www.cablelabs.com/projects/cablehome/
        specifications/.

   [3] Bradner, S., "Key words for use in RFCs to Indicate Requirement
       Levels", BCP 14, RFC 2119, March 1997.

   [4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March
       1997.

6.  Authors' Addresses

        Kevin Luehrs
        CableLabs
        400 Centennial Parkway
        Louisville, CO 80027
        Phone:  (303) 661-9100
        EMail:  k.luehrs@cablelabs.com

        Richard Woundy
        Comcast Cable
        27 Industrial Drive
        Chelmsford, MA 01824
        Phone: (978) 244-4010
        EMail: richard_woundy@cable.comcast.com

        John Bevilacqua
        YAS Corporation
        300 Brickstone Square
        Andover, MA 01810
        Phone: (978) 749-9999
        EMail: john@yas.com









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Internet Draft    KDC Server Address Sub-option       February 2003


7.  Full Copyright Statement

   Copyright (C) The Internet Society (2003). All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph
   are included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of develop-
   ing Internet standards in which case the procedures for copyrights
   defined in the Internet Standards process must be followed, or as
   required to translate it into languages other than English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.


   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Acknowledgement

    Funding for the RFC Editor function is currently provided by
    the Internet Society.
























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