Network Working Group P. Eronen, Ed.
Request for Comments: 4072 Nokia
Category: Standards Track T. Hiller
Lucent Technologies
G. Zorn
Cisco Systems
August 2005
Diameter Extensible Authentication Protocol (EAP) Application
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
The Extensible Authentication Protocol (EAP) provides a standard
mechanism for support of various authentication methods. This
document defines the Command-Codes and AVPs necessary to carry EAP
packets between a Network Access Server (NAS) and a back-end
authentication server.
Table of Contents
1. Introduction ...................................................2
1.1. Conventions Used in This Document ........................3
2. Extensible Authentication Protocol Support in Diameter .........3
2.1. Advertising Application Support ..........................3
2.2. Protocol Overview ........................................4
2.3. Sessions and NASREQ Interaction ..........................6
2.3.1. Scenario 1: Direct Connection .....................7
2.3.2. Scenario 2: Direct Connection with Redirects ......8
2.3.3. Scenario 3: Direct EAP, Authorization via Agents ..9
2.3.4. Scenario 4: Proxy Agents .........................10
2.4. Invalid Packets .........................................10
2.5. Retransmission ..........................................11
2.6. Fragmentation ...........................................12
2.7. Accounting ..............................................12
2.8. Usage Guidelines ........................................13
Eronen, et al. Standards Track [Page 1]RFC 4072 Diameter EAP Application August 2005
2.8.1. User-Name AVP ....................................13
2.8.2. Conflicting AVPs .................................13
2.8.3. Displayable Messages .............................14
2.8.4. Role Reversal ....................................14
2.8.5. Identifier Space .................................14
3. Command-Codes .................................................14
3.1. Diameter-EAP-Request (DER) Command ......................15
3.2. Diameter-EAP-Answer (DEA) Command .......................16
4. Attribute-Value Pairs .........................................18
4.1. New AVPs ................................................18
4.1.1. EAP-Payload AVP ..................................18
4.1.2. EAP-Reissued-Payload AVP .........................18
4.1.3. EAP-Master-Session-Key AVP .......................19
4.1.4. EAP-Key-Name AVP .................................19
4.1.5. Accounting-EAP-Auth-Method AVP ...................19
5. AVP Occurrence Tables .........................................19
5.1. EAP Command AVP Table ...................................20
5.2. Accounting AVP Table ....................................21
6. RADIUS/Diameter Interactions ..................................22
6.1. RADIUS Request Forwarded as Diameter Request ............22
6.2. Diameter Request Forwarded as RADIUS Request ............23
6.3. Accounting Requests .....................................24
7. IANA Considerations ...........................................24
8. Security Considerations .......................................24
8.1. Overview ................................................24
8.2. AVP Editing .............................................26
8.3. Negotiation Attacks .....................................27
8.4. Session Key Distribution ................................28
8.5. Privacy Issues ..........................................28
8.6. Note about EAP and Impersonation ........................29
9. Acknowledgements ..............................................29
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