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Johansson 5 Ericsson 6 May 30, 2002 8 AAA NAI for Mobile IPv4 Extension 9 draft-ietf-mobileip-aaa-nai-02 11 Status of this Memo 13 This document is an Internet-Draft and is in full conformance with 14 all provisions of Section 10 of RFC2026. 16 Internet-Drafts are working documents of the Internet Engineering 17 Task Force (IETF), its areas, and its working groups. Note that 18 other groups may also distribute working documents as Internet- 19 Drafts. 21 Internet-Drafts are draft documents valid for a maximum of six months 22 and may be updated, replaced, or obsoleted by other documents at any 23 time. It is inappropriate to use Internet-Drafts as reference 24 material or to cite them other than as "work in progress." 26 The list of current Internet-Drafts can be accessed at http:// 27 www.ietf.org/ietf/1id-abstracts.txt. 29 The list of Internet-Draft Shadow Directories can be accessed at 30 http://www.ietf.org/shadow.html. 32 This Internet-Draft will expire on November 28, 2002. 34 Copyright Notice 36 Copyright (C) The Internet Society (2002). All Rights Reserved. 38 Abstract 40 When a mobile node moves between two foreign networks it has to be 41 reauthenticated. If the home network has multiple AAA servers the 42 reauthentication request may not be received by the same AAAH as 43 previous authentication requests. 45 In order for the new AAAH to be able to forward the request to the 46 correct HA it has to know the identity of the HA. This document 47 defines an extension that enables the HA to pass its identity to the 48 mobile node which can in turn pass it to the AAA server when changing 49 point of attachment. This document specifies a NAI extension that 50 can carry these NAIs. 52 Table of Contents 54 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 56 2. Requirements terminology . . . . . . . . . . . . . . . . . . . 3 58 3. AAA NAI Extension . . . . . . . . . . . . . . . . . . . . . . 4 59 3.1 Processing of the AAA NAI Extension . . . . . . . . . . . . . 5 61 4. HA Identity subtype . . . . . . . . . . . . . . . . . . . . . 5 63 5. AAAH Identity subtype . . . . . . . . . . . . . . . . . . . . 6 65 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 67 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 69 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6 71 Noramtive References . . . . . . . . . . . . . . . . . . . . . 7 73 Informative References . . . . . . . . . . . . . . . . . . . . 7 75 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 7 77 Full Copyright Statement . . . . . . . . . . . . . . . . . . . 8 79 1. Introduction 81 When building networks one would like to be able to have redundancy. 82 In order to achieve this, one might place multiple AAA servers in one 83 domain. When a mobile node registers via a visited network the 84 authentication will be handled by one of the AAA servers in the home 85 domain. At a later point, when the mobile node moves to another 86 visited domain it again has to be authenticated. However, due to the 87 redundancy offered by the AAA protocol, it can not be guaranteed that 88 the authentication will be handled by the same AAAH server as the 89 previous one which can cause problems when trying to contact the HA 90 assigned during this session. 92 To solve this the home agent MUST include the AAAH NAI in the 93 registration reply message, sent via the AAA infrastructure, which 94 the mobile node then MUST include in every subsequent registration 95 request sent to a foreign agent when changing point of attachment. 97 Furthermore, the only information that is available about the home 98 agent in the registration request is the IP address as defined in RFC 99 3220 [1]. This is unfortunately not enough, since the AAA 100 infrastructure needs to know the FQDN identity of the home agent to 101 be able to correctly handle the assignment of the home agent. A 102 reverse DNS lookup would only disclose the identity of the Mobile IP 103 interface for that HA IP address, which may or may not be the same as 104 the AAA interface of the home agent. One way of solving this problem 105 would be for the home agent to include its identity in the 106 registration reply so that it can be included by the mobile node in 107 the coming registration requests when changing point of attachment. 109 2. Requirements terminology 111 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 112 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 113 document are to be interpreted as described in RFC 2119 [3]. 115 The Mobile IP related terminology used in this document is described 116 in RFC 3220 [1]. 118 The Mobile IP related terminology described in RFC 3220 [1] is used 119 in this document. In addition, the following terms are used: 121 AAAH 122 AAA Server in the Home Network 124 AAAF 125 AAA Server in the Foreign Network 127 Authentication 128 The process of verifying (using cryptographic techniques, for all 129 applications in this specification) the identity of the originator 130 of a message. 132 Foreign Network 133 Any network other than the mobile node's Home network. 135 FQDN 136 Fully Qualified Domain Name. 138 Home Network 139 A network, possible virtual, having a network prefix matching that 140 of a mobile node's home address. Note that standard IP routing 141 mechanisms will deliver datagrams destined to a mobile node's Home 142 Address to the mobile node's Home Network. 144 Identity 145 The identity of a node is equal to its FQDN. 147 NAI 148 Network Access Identifier [4]. 150 Visited Network 151 A network other than a mobile node's Home Network, to which the 152 mobile node is currently connected. 154 3. AAA NAI Extension 156 This section defines an AAA NAI Extension, used by any extension that 157 must carry data in the format of an NAI [5]. This extension may be 158 carried by Registration Request and Reply messages. 160 0 1 2 3 161 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 1 162 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 163 | Type | Length | Sub-Type | NAI ... 164 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 166 Type 167 (Type to be assigned by IANA) (skippable) [1] 169 Length 8-bit unsigned integer. Length of the extension, in octets, 170 excluding the extension Type and the extension Length 171 fields. This field MUST be set to 1 plus the total length 172 of the NAI field. 174 Sub-Type This field describes the type of the entity which owns the 175 NAI. The following subtypes are defined: 177 1 HA Identity NAI HA Identity (Section 4) 179 2 AAAH Identity NAI AAAH Identity (Section 5) 181 NAI Contains the NAI [4] in a string format. 183 3.1 Processing of the AAA NAI Extension 185 When a mobile node or home agent adds an AAA NAI extension to a 186 registration message, the extension MUST appear prior to any 187 authentication extensions. 189 In the event the foreign agent adds an AAA NAI extension to a 190 registration message, the extension MUST appear prior to any 191 authentication extensions added by the FA. 193 4. HA Identity subtype 195 The HA identity uses subtype 1 of the AAA NAI Extension. It contains 196 the NAI of the AAA interface of the HA in the form hostname@realm. 197 Together the hostname and realm forms the complete FQDN 198 (hostname.realm) of the HA's AAA interface. 200 The home agent MUST provide this in every registration reply sent to 201 the mobile node destined through the AAA infrastructure. 203 A mobile node that recieves this extension in a registration reply 204 message MUST provide it in every registration request when re- 205 authentication is needed. If the mobile node requests a specific 206 home agent and it has the information available it MUST provide this 207 extension in its initial registration request. 209 The foreign agent MUST provide it to the AAA server by means 210 described in [2]. 212 5. AAAH Identity subtype 214 The AAAH identity uses subtype 2 of the AAA NAI Extension. It 215 contains the NAI of the home AAA server in the form hostname@realm. 216 Together the hostname and realm forms the complete FQDN 217 (hostname.realm) of the home AAA servers interface. 219 The home agent MUST provide this in every registration reply sent to 220 the mobile node destined through the AAA infrastructure. 222 A mobile node MUST always save the latest AAAH Identity received in 223 the registration reply message and MUST provide the AAAH Identity in 224 every registration request sent when re-authenticating. 226 If the AAAH identity is present, the foreign agent MUST include this 227 identity when requesting the Mobile Node authentication through the 228 AAA infrastructure as described in [2]. 230 6. Security Considerations 232 This specification introduces new Mobile IP extensions that are used 233 to carry mobility agent and AAA server identities, in the form of 234 Network Access Identifiers. It is assumed that the Mobile IP 235 messages that would carry these extensions would be authenticated in 236 the manner that is described in [4], or any follow-on authentication 237 mechanisms. Therefore, this specification does not lessen the 238 security of Mobile IP messages. 240 It should be noted, that the identities sent in the extensions 241 specified herein MAY be sent in the clear over the network. However, 242 the authors do not envision that this information would create any 243 security issues. 245 7. IANA Considerations 247 The value assigned to the AAA NAI Extension MUST be a unique value 248 from the IANA number space for Mobile IPv4 skippable extensions. 250 8. Acknowledgements 252 Thanks to the original authors of the GNAIE draft, Mohamed M Khalil, 253 Emad Qaddoura, Haseeb Akhtar, Pat R. Calhoun. The original draft 254 was removed from the MIP WG charter when no use was seen for the 255 extension. The original ideas has been reused in this draft. 257 Also thanks to Henrik Levkowetz and Kevin Purser for valuable 258 feedback and help when writing this draft. 260 Noramtive References 262 [1] Perkins, C., "IP Mobility Support for IPv4", RFC 3220, January 263 2002. 265 [2] Perkins, C., Calhoun, P. and T. Johansson, "Diameter Mobile IPv4 266 Application", draft-ietf-aaa-diameter-mobileip-10 (work in 267 progress), April 2002. 269 Informative References 271 [3] Bradner, S., "Key words for use in RFCs to Indicate Requirement 272 Levels", BCP 14, RFC 2119, March 1997. 274 [4] Aboba, B. and M. Beadles, "The Network Access Identifier", RFC 275 2486, January 1999. 277 [5] Calhoun, P. and C. Perkins, "Mobile IP Network Access Identifier 278 Extension for IPv4", RFC 2794, March 2000. 280 Authors' Addresses 282 Fredrik Johansson 283 ipUnplugged AB 284 Arenavagen 33 285 Stockholm S-121 28 286 SWEDEN 288 Phone: +46 8 725 5916 289 EMail: fredrik@ipunplugged.com 291 Tony Johansson 292 Ericsson Inc 293 2100 Shattuck Ave. 294 Berkeley, CA 94704 295 USA 297 Phone: +1 510 541 8783 298 EMail: tony.johansson@ericsson.com 300 Full Copyright Statement 302 Copyright (C) The Internet Society (2002). All Rights Reserved. 304 This document and translations of it may be copied and furnished to 305 others, and derivative works that comment on or otherwise explain it 306 or assist in its implementation may be prepared, copied, published 307 and distributed, in whole or in part, without restriction of any 308 kind, provided that the above copyright notice and this paragraph are 309 included on all such copies and derivative works. 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