Internet DRAFT - draft-tschofenig-mip6-aaa-ha-diameter
draft-tschofenig-mip6-aaa-ha-diameter
Mobility for IPv6 (mip6) H. Tschofenig
Internet-Draft T. Tsenov
Expires: April 26, 2006 Siemens
G. Giaretta
TILab
J. Bournelle
GET/INT
October 23, 2005
Mobile IPv6 Bootstrapping using Diameter
draft-tschofenig-mip6-aaa-ha-diameter-01.txt
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Copyright (C) The Internet Society (2005).
Abstract
Both Mobile IPv6 bootstrapping solutions require use of a AAA
interface. In the split scenario, this interface is between the Home
Agent and the AAA infrastructure of the Mobile Service Provider (MSP)
and the Mobility Service Authorizer (MSA). The first interface
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should meet a list of requirements. This document provides an
overview of the capabilities and design of the Diameter protocol that
could meet the specified goals. In the integrated scenario, in
addition to this interface, the impact of the MIPv6 bootstrapping on
the AAA interface for network access authentication must be
considered. Basically, this interface is also used to carry Home
Agent information. This document defines the necessary AVP and how
Diameter can be used in the integrated scenario.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. General goals . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1. G1.1 - G1.4 Security . . . . . . . . . . . . . . . . . 6
3.1.2. Dead peer detection - the HA-AAA interface SHOULD
support inactive peer detection. . . . . . . . . . . . 6
3.2. Service Authorization . . . . . . . . . . . . . . . . . . 6
3.2.1. G2.1. The HA-AAA interface SHOULD allow the use of
Network Access Identifier (NAI) to identify the
mobile node. . . . . . . . . . . . . . . . . . . . . . 6
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. . . . . . . . . . . . . . . . . . 7
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). . . . . . . . . . . . . . . . . . . . . . 7
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. . . . . . . . . . 7
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. . 8
3.3. Accounting - G3.1. The HA-AAA interface MUST support
the transfer of accounting records needed for service
control and charging . . . . . . . . . . . . . . . . . . . 8
3.4. Mobile Node Authentication (G4.1. and G4.2.) . . . . . . . 8
3.5. Provisioning of configuration parameters . . . . . . . . . 9
4. Bootstrapping Mobile IPv6 in the split scenario . . . . . . . 10
5. Bootstrapping Mobile IPv6 in the integrated scenario based
on DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1. Home-Agent AVP . . . . . . . . . . . . . . . . . . . . . . 14
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6. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7. Security considerations . . . . . . . . . . . . . . . . . . . 16
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1. Normative References . . . . . . . . . . . . . . . . . . . 19
10.2. Informative References . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20
Intellectual Property and Copyright Statements . . . . . . . . . . 21
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1. Introduction
In Mobile IPv6 deployment, authentication, authorization and
accounting issues in the protocol operations are approached by using
the AAA infrastructure. The [8] document presents a number of
bootstrapping scenarios using the HA-AAA interface and defines a list
of requirements that this interface should cover. In the first part,
this document deals with the functional capabilities of the Diameter
protocol as a AAA protocol applicable at the discussed interface.
Currently, two Mobile IPv6 bootstrapping solutions exist depending on
the considered scenario. In the split scenario, only a HA-AAA
interface is considered whereas in the integrated scenario both NAS-
AAA and HA-AAA interface need to be addressed. This document
explains how to use Diameter and its EAP and NASREQ applications to
handle the AAA part of the both Mobile IPv6 bootstrapping solutions.
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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 HA-AAA
interface specified in [8].
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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 [8], 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. IPsec
or TLS provide the hop-by-hop security. Combined, they SHOULD be
able to provide the range of security services required for the HA-
AAA interface.
3.1.2. Dead peer detection - the HA-AAA 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 HA-AAA 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
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.
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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 [2], credit control [9], quality of
service [10]. 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 [2], provides IP packet filter
description. QoS-Filter-Rule AVP defined by Diameter NASREQ
application and QSPEC AVP defined by Diameter QoS Authorization [10]
provide QoS parameter description. Credit Control application [9]
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 [9]. 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
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
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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 [11], 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 HA-AAA 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
NASREQ and EAP applications, and MIGHT be re-used at the AAAH-AH
interface.[2], [3]
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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 [3].
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4. Bootstrapping Mobile IPv6 in the split scenario
In the split scenario for bootstrapping Mobile IPv6 [4], the MN
discovers HA through DNS mechanism. Then it uses IKEv2 [5] to setup
IPsec SAs. IKEv2 supports EAP to authenticate the Initiator and thus
the MN. As such, the MN can use its credentials (obtained from the
MSA) to be authenticated for the IPv6 mobility service. The HA MAY
rely on a EAP server co-located on a AAA server for this purpose. In
this case, a HA-AAA interface is needed. This interface MUST support
transport of EAP packets.
+----+ IKEv2 +----+ Diameter EAP +---+
| MN |<----------->| HA |<-------------------->|AAA|
+----+ +----+ +---+
Figure 1: Diameter EAP as the HA-AAA interface in Split scenario
For this purpose, the HA can use Diameter EAP Application [3] (cf.
Figure 1). As shown in the previous section, this protocol fulfill
goals described in [8]
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MN HA AAAH
-- -- ----
IKE_SA_INIT
<------------------------------>
HDR, SK{IDi,[CERTREQ,] [IDr,]
SAi2, TSi, TSr}
------------------------------->
DER (EAP-Response)
------------------------>
DEA (EAP-Request)
<------------------------
HDR, SK {IDr, [CERT,] AUTH,
EAP }
<-------------------------------
HDR, SK {EAP}
-------------------------------->
DER (EAP-Response)
------------------------>
DEA (EAP-Request)
<------------------------
HDR, SK{EAP-Request}
<-------------------------------
HDR, SK{EAP-Response}
-------------------------------->
DER (EAP-Response)
------------------------>
... ...
DEA (EAP-Success)
<------------------------
HDR, SK{EAP-Success}
<-------------------------------
HDR, SK{AUTH}
------------------------------->
HDR, SK {AUTH, SAr2, TSi, TSr }
<-------------------------------
Figure 2: IKEv2 Diameter EAP
MN and HA start with an IKE_SA_INIT to setup the IKE SA. The MN
indicates its desire to use EAP by not including the AUTH payload in
the third message. However it indicates its identity (e.g. NAI) by
using the IDi field. If the HA supports EAP for authentication, it
forwards the identity to the AAAH by sending a Diameter-EAP-Request
(DER) message containing the identity in the EAP-Payload AVP and in
the User-Name AVP. Based on this identity, the AAAH chooses an
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authentication method and sends the first EAP-Request in the
Diameter-EAP-Answer message. During the EAP authentication phase,
the HA relays EAP packets between the MN and the AAAH. If the
authentication succeeds and if the MN is authorized to use Mobile
IPv6 service, the AAAH sends a DEA message containing the EAP-success
and the AAA-Key derived from the EAP authentication method . Note
that EAP authentication methods that do not derive keys are not
recommended. This key is used by both MN and HA to generate the AUTH
payload. In the latter message, MN and HA finish to setup IPsec SAs
for Mobile IPv6.
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5. Bootstrapping Mobile IPv6 in the integrated scenario based on DHCP
The Figure 3 represents the components and architecture of the Mobile
IPv6 bootstrapping solution in the integrated scenario. This figure
is extracted from [6].
|
ASP(/MSP) | ASA/MSA(/MSP)
|
|
+-------+ | +-----+
| AAAL |-----------|--------|AAAH |
+-------+ | +-----+
| |
| |
| |
| |
| |
+-----+ +------+ |
+----+ | | |DHCP | |
| MN |------| NAS/|----|Server| |
+----+ |Relay| | | |
+-----+ +------+ |
|
|
+--------+ | +--------+
| HA | | | HA |
| in ASP | | |in MSP |
+--------+ | +--------+
Figure 3: Mobile IPv6 Bootstrapping: Integrated scenario
In the solution for the Integrated scenario based on DHCP [6], the HA
is allocated during the network access authentication phase. Then,
the MN queries a HA by using DHCPv6 (the NAS acting as a DCHPv6
relay). In this scenario, it is the same entity that authorizes
Network Access (ASA) and Mobility Service (MSA). The current
solution [6] allows the MN to require a local HA (in the visited ASP)
by specifying it in its DHCPv6 request. Even in this case, the AAAH
allocates a HA from the home MSP. The Home Agent information is sent
during the AAA exchange for network access authentication. After
this, the MN initiates an IKEv2 exchange with the allocated HA as
described in the previous section.
Diameter EAP [3] or NASREQ [2] applications are used as Diameter AAA
protocols for network access. As we are combining network access and
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mobility authorization, the Home Agent information SHOULD be sent
when the MN is correctly authenticated. For this reason, the AVP
containing HA information MUST be sent in a AAA message containing
the success authentication. For Diameter EAP, this AVP will be
carried in a DEA message containing the EAP-Payload AVP with EAP-
Success. For Diameter-NASREQ, the AVP MUST be carried in AA-Answer
containing the Result-Code AVP indicating a success.
5.1. Home-Agent AVP
The Home-Agent AVP (AVP Code To Be Assigned) is of type OctetString
and contains the IPv6 address of the allocated Home Agent. The 'M"
bit in the header of the Home-Agent AVP MUST be cleared, otherwise if
the NAS does not support it, the authentication will fail.
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6. Conclusion
This document provides information about the Diameter usage for both
split and integrated scenarios for Mobile IPv6 bootstrapping. It is
not yet complete since the goals for the HA-AAA interface [8] are
still work in progress.
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7. 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 [11], [8] and [1].]
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8. IANA Considerations
The AVP code for the Home-Agent AVP needs to be allocated.
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9. Acknowledgements
We would like to thank the MIPv6 Bootstrapping Design Team for their
comments. Additionally, we would like to thank Junghoon Jee for his
feedback.
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10. References
10.1. Normative References
[1] Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko,
"Diameter Base Protocol", RFC 3588, September 2003.
[2] Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter
Network Access Server Application", RFC 4005, August 2005.
[3] Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
Authentication Protocol (EAP) Application", RFC 4072,
August 2005.
[4] Giaretta, G., "Mobile IPv6 bootstrapping in split scenario",
draft-ietf-mip6-bootstrapping-split-01 (work in progress),
October 2005.
[5] Kaufman, C., "Internet Key Exchange (IKEv2) Protocol",
draft-ietf-ipsec-ikev2-17 (work in progress), October 2004.
[6] Chowdhury, K. and A. Yegin, "MIP6-bootstrapping via DHCPv6 for
the Integrated Scenario",
draft-ietf-mip6-bootstrapping-integrated-dhc-00 (work in
progress), October 2005.
[7] Hamilton, M. and R. Wright, "Use of DNS Aliases for Network
Services", BCP 17, RFC 2219, October 1997.
10.2. Informative References
[8] Giaretta, G., "Goals for AAA-HA interface",
draft-ietf-mip6-aaa-ha-goals-00 (work in progress), May 2005.
[9] 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.
[10] Alfano, F., "Diameter Quality of Service Application",
draft-alfano-aaa-qosprot-04 (work in progress), September 2005.
[11] Giaretta, G., "MIPv6 Authorization and Configuration based on
EAP", draft-giaretta-mip6-authorization-eap-02 (work in
progress), October 2004.
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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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