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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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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