


Network Working Group                                            G. Zorn
Internet-Draft                                               Network Zen
Intended status: Standards Track                                   Q. Wu
Expires: October 24, 2011                                        Y. Wang
                                                                  Huawei
                                                          April 22, 2011


                The ERP Local Domain Name DHCPv6 Option
                   draft-ietf-hokey-ldn-discovery-10

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 the EAP Re-authentication Protocol (ERP) EAP method of the name
   of the local domain for ERP.

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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on October 24, 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



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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

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





























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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 LDN to be used in ERP 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 LDN to be used in
   ERP.

2.  Terminology

2.1.  Standards Language

   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].

2.2.  Acronyms

   FQDN  Fully Qualified Domain Name

   AAA  Authentication, Authorization and Accounting

   DSRK  Domain-Specific Root Key

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.

   The contents of the ERP Local Domain Name option are intended only
   for use with ERP and do not represent the name of a local domain for
   any other purposes.

3.1.  DHCPv6 ERP Local Domain Name Option

   The format of this option is:






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   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_ERP_LOCAL_DOMAIN_NAME|         option-length         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | erp-local-domain-name...
   +-+-+-+-+-+-+-+-+-+-+-+-+-

   option code
      OPTION_ERP_LOCAL_DOMAIN_NAME (TBD)

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

   erp-local-domain-name
      This field contains the name of the local ERP 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 ERP LDN and requires the DHCPv6
   Server to provide the DHCPv6 ERP LDN option, it MUST include an
   Option Request option requesting the DHCPv6 ERP Local Domain Name
   option, as described in Section 22.7 of RFC 3315 [RFC3315].

   When the DHCPv6 client recieves an ERP Local Domain Name option with
   the ERP LDN present in it, it MUST verify that the option length is
   no more than 256 octets (the maximum length of a single fully-
   qualified domain name (FQDN) allowed by the 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 ERP local
   domain name for a client (for example, from a previous AAA exchange),
   it SHOULD include it in an instance of the DHCPv6 ERP Local Domain
   Name option and forward to the DHCPv6 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



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   and requires server authentication and integrity 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
                                                 Options", draft-ietf-
                                                 dhc-dhcpv6-relay-
                                                 supplied-options-04
                                                 (work in progress),
                                                 October 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-



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                                                 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
                                                 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









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   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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