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Mobility for IPv6 (mip6)                                   H. Tschofenig
Internet-Draft                                                 T. Tsenov
Expires: January 12, 2006                                        Siemens
                                                             G. Giaretta
                                                                   TILab
                                                            J. Bournelle
                                                                 GET/INT
                                                           July 11, 2005


       Diameter applicability for AAA-HA Interface in Mobile IPv6
              draft-tschofenig-mip6-aaa-ha-diameter-00.txt

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   This Internet-Draft will expire on January 12, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   In Mobile IPv6 deployment a need for interface between the Home Agent
   and the AAA infrastructure of the Mobile Service Provider (MSP) and
   the Mobility Service Authorizer (MSA) has been identified.  This
   interface should meet a list of requirements.  This document provides



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   an overview description of the functionalities and design of Diameter
   protocol which could meet the specified goals.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Goals  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1   General goals  . . . . . . . . . . . . . . . . . . . . . .  5
       3.1.1   G1.1 - G1.4 Security . . . . . . . . . . . . . . . . .  5
       3.1.2   Dead peer detection - the AAA-HA interface should
               support inactive peer detection. . . . . . . . . . . .  5
     3.2   Service Authorization  . . . . . . . . . . . . . . . . . .  5
       3.2.1   G2.1. The AAA-HA interface should allow the use of
               Network Access Identifier (NAI) to identify the
               mobile node. . . . . . . . . . . . . . . . . . . . . .  5
       3.2.2   G2.2. The HA should be able to query the AAAH
               server to verify Mobile IPv6 service authorization
               for the mobile node. . . . . . . . . . . . . . . . . .  6
       3.2.3   G2.3. The AAAH server should be able to enforce
               explicit operational limitations and authorization
               restrictions on the HA.( e.g. packet filters, QoS
               parameters). . . . . . . . . . . . . . . . . . . . . .  6
       3.2.4   G2.4 - G2.6. Issues addressing the maintenance of
               a Mobile IPv6 session by         the AAAH server,
               e.g. authorization lifetime, extension of the
               authorization lifetime and explicit
               session termination by the AAAH server side. . . . . .  6
       3.2.5   G2.7. The AAAH server should be able to retrieve
               the Mobile IPv6 state associated to a specific MN
               from the correspondent HA. This may be useful to
               periodically verify the Mobile IPv6 service status.  .  7
     3.3   Accounting - G3.1. The AAA-HA interface must support
           the transfer of accounting records needed for service
           control and charging . . . . . . . . . . . . . . . . . . .  7
     3.4   Mobile Node Authentication (G4.1. and G4.2.) . . . . . . .  7
     3.5   Provisioning of configuration parameters . . . . . . . . .  8
   4.  Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  Security considerations  . . . . . . . . . . . . . . . . . . . 10
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     8.1   Normative References . . . . . . . . . . . . . . . . . . . 13
     8.2   Informative References . . . . . . . . . . . . . . . . . . 13
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 13
       Intellectual Property and Copyright Statements . . . . . . . . 15





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1.  Introduction

   In Mobile IPv6 deployment, authentication, authorization and
   accounting issues in the protocol operations are approached by
   definition of an interface between the Home Agent (HA) and the AAA
   infrastructure of the Mobility Service Provider (MSP). [3] document
   presents a number of bootstrapping scenarios using the AAA-HA
   interface and defines a list of requirements that the interface
   should cover.  This document deals with the functionalities provided
   by Diameter protocol as a AAA protocol applicable at the discussed
   interface.








































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2.  Motivation

   Designed to cover network access requirements for AAA protocols [1],
   Diameter protocol provides a framework for applications offering AAA
   services.  This design approach gives to the protocol extensibility,
   interoperability and flexibility in offering AAA solutions in
   comparison to other AAA protocols.  Support of definition of new
   application Ids, commands and AVPs provides extensibility.
   Recommended re-use of commands and AVPs and careful consideration of
   the level of AVP's support provides interoperability.  Usage of IPsec
   and TLS for transport hop-by-hop security, possible support for AVP
   integrity and confidentiality and usage of peer-to-peer model (any
   Diameter node can initiate a request message) provide flexibility of
   the Diameter AAA applications to fit to specific requirements.

   In the following sections we try to specify by which means a possible
   Diameter application would cover the requirements for the AAA-HA
   interface specified in [3].

































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3.  Goals

   In presentation of the analysis of goals and possible design
   solutions by Diameter we follow the classification, labels and naming
   assigned in the document [3], where these goals are identified.
   Since several of the issues might be addressed in similar way or by
   similar Diameter functionality, we have grouped these issues and have
   given a general description of the groups.

3.1  General goals

3.1.1  G1.1 - G1.4 Security

   As design goals for an AAA interface, G1.1 - G1.4 goals specify
   standard requirements for a AAA protocol - mutual authentication of
   the peers, integrity, replay protection and confidentiality.  Various
   authentication methods might be used, many of them are already
   supported by a Diameter NASREQ and EAP applications [4],[5] and could
   be re-used.  IPsec or TLS provide the hop-by-hop security.  Combined,
   they should be able to provide the range of security services
   required for the AAA-HA interface.

3.1.2  Dead peer detection - the AAA-HA interface should support
       inactive peer detection.

   Two possible approaches might be considered here:

   o  AAAH server and Home Agent establish a transport connection
      between each other.  In this case Diameter heartbeat messages
      called Watch-Dog-Request/Answer, which are exchanged over this
      connection to test for its aliveness, may be used to detect
      inactivity in any of the two Diameter peers.


   o  AAAH server and Home Agent do not have transport connection.  In
      this case inactive peer detection functionality should be provided
      into the Diameter session - service stateless Diameter sessions
      might be established between the AAAH server and the range of
      MSP's Home Agents for detecting HAs availability.



3.2  Service Authorization

3.2.1  G2.1. The AAA-HA interface should allow the use of Network Access
       Identifier (NAI) to identify the mobile node.

   Identification by User-Name AVP [1], which has a format consistent



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   with the NAI specifications, is common for Diameter applications.
   Diameter provides functionality for routing of Diameter requests
   based on the information included in the User-Name AVP.

3.2.2  G2.2. The HA should be able to query the AAAH server to verify
       Mobile IPv6 service authorization for the mobile node.

   Based on the peer-to-peer model, Diameter design gives the
   functionality that any Diameter node can initiate a request message.
   This, combined with the support of EAP, would provide flexible
   solutions for this issue.  Currently several Diameter application
   standardized or under work-in-progress address different types of
   authorization - network access [4], credit control [6], quality of
   service [7].  This might allow re-use of present AVPs over the
   AAAH-HA interface.

3.2.3  G2.3. The AAAH server should be able to enforce explicit
       operational limitations and authorization restrictions on the
       HA.( e.g. packet filters, QoS parameters).

   Several present Diameter applications, standardized or under work-in-
   progress address an operation and authorization control over specific
   services and have defined appropriate AVPs.  NAS-Filter-Rule AVP,
   defined by Diameter NASREQ application [4], provides IP packet filter
   description.  QoS-Filter-Rule AVP defined by Diameter NASREQ
   application and QSPEC AVP defined by Diameter QoS Authorization [7]
   provide QoS parameter description.  Credit Control application [6]
   provides cost control over requested services.  AVPs may be re-used
   for providing required functionality over the AAAH-HA interface.
   This, combined with the possibility that any node can initiate
   request message, gives control to the AAAH server over HA's
   functionality.

3.2.4  G2.4 - G2.6. Issues addressing the maintenance of a Mobile IPv6
       session by         the AAAH server, e.g. authorization lifetime,
       extension of the authorization lifetime and explicit
       session termination by the AAAH server side.

   Diameter base protocol provides a powerful set of commands and AVPs
   for management of the authorization and accounting sessions.  A
   number of AVPs (Auth-Lifetime-AVP, Grace-Period-AVP, Session-Timeout-
   AVP) handle the duration (in time) of an authorization session [1].
   Additional AVPs for measuring the authorization duration in units
   different that time are specified too [6].  Exchanging of application
   specific authorization request/answer messages provides extension of
   the authorization session.  Initiation of the re-authorization by
   both sides could be supported.  Both sides could initiate session
   termination, by using Diameter Session Termination and Abort Session



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   messages.

   All these are applied to the Diameter session used for authorization
   of a Mobile IPv6 session and need to be applied appropriately to this
   Mobile IPv6 session too.

3.2.5  G2.7. The AAAH server should be able to retrieve the Mobile IPv6
       state associated to a specific MN from the correspondent HA. This
       may be useful to periodically verify the Mobile IPv6 service
       status.

   This issue has two sides:

   1.  How the AAAH should know which HA to contact to retrieve current
       status of MN's Mobile IPv6 service in case of stateless MSP
       architecture and several servicing AAA servers? - As analyzed
       into the [8], this need would be required for re-authorization
       and in this case the provision of HA info could be provided from
       the MN during the re-authentication session between NM and AAAH
       server.


   2.  Once having the HA info, AAAH should contact it to verify the
       status of MN's Mobile IPv6 service. - This could be performed by
       Request/Response messages initiated by the AAAH server.  This
       functionality is supported by the Diameter protocol and currently
       is applied into Diameter SIP application for updating user
       profiles at Diameter client (i.e., SIP server).



3.3  Accounting - G3.1. The AAA-HA interface must support the transfer
     of accounting records needed for service control and charging

   Diameter accounting protocol provides a variety of options - real-
   time accounting, event/session-type accounting records, fault
   resilience, correlation of accounting records.  Requirements for the
   accounting services over AAAH-HA interface are standard.  Definition
   or re-used of AVPs for the specific accounting records combined with
   the functionality of the Diameter accounting protocol should provide
   desired accounting services.

3.4  Mobile Node Authentication (G4.1. and G4.2.)

   These issues require the functionality of AAAH server working as a
   back-end authentication server and HA working as NAS and EAP
   authenticator in pass-through mode for providing a mobile node
   authentication.  These functionalities are provided by Diameter



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   NASREQ and EAP applications, and might be re-used at the AAAH-AH
   interface.[4], [5]

3.5  Provisioning of configuration parameters

   Issues G5.1 - G5.3 are related to capability of exchanging and
   negotiating of operational parameters for Mobile IPv6 protocol
   bootstrapping and providing appropriate security level for this
   information.

   Diameter provides secure transport by means of IPsec, TLS and
   possible AVPs integrity and confidentiality support (currently with
   no interest from the community).  Several AVPs could be re-used for
   carrying the operational parameters for the Mobile IPv6
   bootstrapping.  Framed-IPv6-Prefix AVP, Login-IPv6-Host AVP, Framed-
   Interface-Id AVP, Framed-IPv6-Route AVP defined by NASREQ might be
   used for home address provision and AVPs defined in EAP application
   might be used for key transport [5].

































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4.  Conclusion

   This document provides information about the Diameter usage for the
   AAA-HA interface.  It is not yet complete since (a) the goals for the
   AAA-HA interface [3] are still work in progress and (b) solutions for
   all scenarios are not yet available.  A final conclusion about the
   required AVPs cannot be provided at this point in time.












































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5.  Security considerations

   [Editor's Note: Since the document is not complete it is necessary to
   state that the security consideration section is incomplete as well.
   Hence, it is only possible to refer to the security issues raised in
   the Mobile IPv6 and Diameter protocol related documents mentioned
   here, such as [8], [3] and [1].]












































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6.  IANA Considerations

   This document does not require actions to be taken by the IANA.
















































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7.  Acknowledgements

   We would like to thank the MIPv6 Bootstrapping Design Team for their
   comments.  Additionally, we would to thank Junghoon Jee for his
   feedback.














































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8.  References

8.1  Normative References

   [1]  Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko,
        "Diameter Base Protocol", RFC 3588, September 2003.

   [2]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", March 1997.

8.2  Informative References

   [3]  Giaretta, G., "Goals for AAA-HA interface",
        draft-ietf-mip6-aaa-ha-goals-00 (work in progress), May 2005.

   [4]  Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter
        Network Access Server Application",
        draft-ietf-aaa-diameter-nasreq-17 (work in progress), July 2004.

   [5]  Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
        Authentication Protocol (EAP) Application",
        draft-ietf-aaa-eap-10 (work in progress), November 2004.

   [6]  Mattila, L., Koskinen, J., Stura, M., Loughney, J., and H.
        Hakala, "Diameter Credit-control Application",
        draft-ietf-aaa-diameter-cc-06 (work in progress), August 2004.

   [7]  Alfano, F., "Diameter Quality of Service Application",
        draft-alfano-aaa-qosprot-02 (work in progress), February 2005.

   [8]  Giaretta, G., "MIPv6 Authorization and Configuration based on
        EAP", draft-giaretta-mip6-authorization-eap-02 (work in
        progress), October 2004.

   [9]  Garcia-Martin, M., "Diameter Session Initiation Protocol (SIP)
        Application", draft-ietf-aaa-diameter-sip-app-07 (work in
        progress), March 2005.














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Authors' Addresses

   Hannes Tschofenig
   Siemens
   Otto-Hahn-Ring 6
   Munich, Bavaria  81739
   Germany

   Email: Hannes.Tschofenig@siemens.com


   Tseno Tsenov
   Siemens
   Otto-Hahn-Ring 6
   Munich, Bayern  81739
   Germany

   Email: tseno.tsenov@mytum.de


   Gerardo Giaretta
   Telecom Italia Lab
   via G. Reiss Romoli, 274
   TORINO,   10148
   Italy

   Email: gerardo.giaretta@tilab.com


   Julien Bournelle
   GET/INT
   9 rue Charles Fourier
   Evry  91011
   France

   Email: julien.bournelle@int-evry.fr















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