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Versions: (draft-wu-hokey-ldn-discovery) 00 01 02 03 04 05 06 07 08 09 10 RFC 6440

Network Working Group                                            G. Zorn
Internet-Draft                                               Network Zen
Intended status: Standards Track                                   Q. Wu
Expires: October 14, 2011                                        Y. Wang
                                                                  Huawei
                                                          April 12, 2011


                The ERP Local Domain Name DHCPv6 Option
                   draft-ietf-hokey-ldn-discovery-07

Abstract

   In order to derive a Domain-Specific Root Key (DSRK) from the
   Extended Master Session Key (EMSK) generated as a side-effect of an
   Extensible Authentication Protocol (EAP) method, the EAP peer must
   discover the name of the domain to which it is attached.

   This document specifies a Dynamic Host Configuration Protocol Version
   6 (DHCPv6) option designed to allow a DHCPv6 server to inform clients
   using EAP of the name of the local domain.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on October 14, 2011.

Copyright Notice

   Copyright (c) 2011 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



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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Option Format . . . . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  DHCPv6 Local Domain Name Option . . . . . . . . . . . . . . 3
   4.  Client Behavior . . . . . . . . . . . . . . . . . . . . . . . . 4
   5.  Relay Agent Behavior  . . . . . . . . . . . . . . . . . . . . . 4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . . . 4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 5
































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1.  Introduction

   The EAP Re-authentication Protocol (ERP) [RFC5296] is designed to
   allow faster re-authentication of a mobile device which was
   previously authenticated by means of the Extensible Authentication
   Protocol [RFC3748].  Given that the local root key (e.g., DSRK RFC
   5295 [RFC5295]) is generated using the local domain name (LDN), LDN
   discovery is an important part of re-authentication.  As described in
   RFC 5296 [RFC5296], the local domain name can be learned by the
   mobile device through the ERP exchange or via a lower-layer
   mechanism.  However, no lower-layer mechanisms for LDN discovery have
   yet been defined.

   This document specifies an extension to DHCPv6 for local domain name
   discovery by ERP peers.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Option Format

   In DHCPv6-based local domain name discovery, the LDN option is used
   by the DHCPv6 client to obtain the local domain name from the DHCPv6
   Server after full EAP authentication has taken place.

3.1.  DHCPv6 Local Domain Name Option

   The format of this option is:

   0                   1                   2                   3
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | OPTION_LOCAL_DOMAIN_NAME    |         option-length         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | local-domain-name...
   +-+-+-+-+-+-+-+-+-+-+-+

   option code
      OPTION_LOCAL_DOMAIN_NAME (TBD)

   option-length
      Length of the local-domain-name field, in octets






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   local-domain-name
      This field contains the name of the local domain and MUST be
      encoded as specified in Section 8 of RFC 3315 [RFC3315] note that
      this encoding does enable the use of internationalized domain
      names, but only as a set of A-labels [RFC5890].

4.  Client Behavior

   If a DHCPv6 client doesn't know the local domain name and requires
   the DHCPv6 Server to provide the DHCPv6 LDN option, it MUST include
   an Option Request option requesting the DHCPv6 LDN option, as
   described in Section 22.7 of RFC 3315 [RFC3315].

   When the DHCPv6 client recieves a LDN option with the local domain
   name present in it, it MUST verify that the option length is no more
   than 256 octets (the maximum length of a single FQDN allowed by DNS),
   and that the local domain name is a properly encoded single FQDN, as
   specified in Section 8, "Representation and Use of Domain Names" of
   RFC3315 [RFC3315].

5.  Relay Agent Behavior

   If a DHCPv6 relay agent has pre-existing knowledge of the local
   domain name (for example, from a previous AAA exchange), it SHOULD
   include it in an instance of the DHCPv6 LDN option and forward to the
   DHPv6 server as a suboption of the Relay-Supplied Options option
   [I-D.ietf-dhc-dhcpv6-relay-supplied-options].

6.  Security Considerations

   The communication between the DHCPv6 client and the DHCPv6 server for
   the exchange of local domain name information is security sensitive
   and requires authentication, integrity and replay protection.  DHCPv6
   security [RFC3315] can be used for this purpose.

7.  IANA considerations

   IANA is requested to assign one new option code from the registry of
   DHCP Option Codes maintained at
   http://www.iana.org/assignments/dhcpv6-parameters, referencing this
   document.

8.  References

8.1.  Normative References

   [I-D.ietf-dhc-dhcpv6-relay-supplied-options]  Lemon, T. and W. Wu,
                                                 "Relay-Supplied DHCP



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                                                 Options", draft-ietf-
                                                 dhc-dhcpv6-relay-
                                                 supplied-options-02
                                                 (work in progress),
                                                 September 2010.

   [RFC2119]                                     Bradner, S., "Key words
                                                 for use in RFCs to
                                                 Indicate Requirement
                                                 Levels", BCP 14,
                                                 RFC 2119, March 1997.

   [RFC3315]                                     Droms, R., Bound, J.,
                                                 Volz, B., Lemon, T.,
                                                 Perkins, C., and M.
                                                 Carney, "Dynamic Host
                                                 Configuration Protocol
                                                 for IPv6 (DHCPv6)",
                                                 RFC 3315, July 2003.

   [RFC5295]                                     Salowey, J., Dondeti,
                                                 L., Narayanan, V., and
                                                 M. Nakhjiri,
                                                 "Specification for the
                                                 Derivation of Root Keys
                                                 from an Extended Master
                                                 Session Key (EMSK)",
                                                 RFC 5295, August 2008.

   [RFC5296]                                     Narayanan, V. and L.
                                                 Dondeti, "EAP
                                                 Extensions for EAP Re-
                                                 authentication Protocol
                                                 (ERP)", RFC 5296,
                                                 August 2008.

8.2.  Informative References

   [RFC3748]                                     Aboba, B., Blunk, L.,
                                                 Vollbrecht, J.,
                                                 Carlson, J., and H.
                                                 Levkowetz, "Extensible
                                                 Authentication Protocol
                                                 (EAP)", RFC 3748,
                                                 June 2004.

   [RFC5890]                                     Klensin, J.,
                                                 "Internationalized



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                                                 Domain Names for
                                                 Applications (IDNA):
                                                 Definitions and
                                                 Document Framework",
                                                 RFC 5890, August 2010.

Authors' Addresses

   Glen Zorn
   Network Zen
   227/358 Thanon Sanphawut
   Bang Na, Bangkok  10260
   Thailand

   Phone: +66 (0) 87-040-4617
   EMail: gwz@net-zen.net


   Qin Wu
   Huawei Technologies Co., Ltd.
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  21001
   China

   Phone: +86-25-84565892
   EMail: sunseawq@huawei.com


   Yungui Wang
   Huawei Technologies Co., Ltd.
   Site B, Floor 10, HuiHong Mansion, No.91 BaiXia Rd.
   Nanjing, Jiangsu  210001
   P.R. China

   Phone: +86 25 84565893
   EMail: w52006@huawei.com















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