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Koodli 5 Expires: April 27, 2015 Intel 6 October 24, 2014 8 EAP Attributes for Wi-Fi - EPC Integration 9 draft-ietf-netext-wifi-epc-eap-attributes-13 11 Abstract 13 With Wi-Fi emerging as a trusted access network for service 14 providers, it has become important to provide functions commonly 15 available in 3G and 4G networks in Wi-Fi access networks as well. 16 Such functions include Access Point Name (APN) Selection, multiple 17 Packet Data Network (PDN) connections, and seamless mobility between 18 Wi-Fi and 3G/4G networks. 20 The EAP/AKA (and EAP/AKA') protocol is required for mobile devices to 21 access the mobile Evolved Packet Core (EPC) via trusted Wi-Fi 22 networks. This document defines a few new EAP attributes to enable 23 the above-mentioned functions in trusted Wi-Fi access networks. The 24 attributes are exchanged between a client (such as a Mobile Node) and 25 its network counterpart (such as a AAA server) in the service 26 provider's infrastructure. 28 Status of This Memo 30 This Internet-Draft is submitted in full conformance with the 31 provisions of BCP 78 and BCP 79. 33 Internet-Drafts are working documents of the Internet Engineering 34 Task Force (IETF). Note that other groups may also distribute 35 working documents as Internet-Drafts. The list of current Internet- 36 Drafts is at http://datatracker.ietf.org/drafts/current/. 38 Internet-Drafts are draft documents valid for a maximum of six months 39 and may be updated, replaced, or obsoleted by other documents at any 40 time. It is inappropriate to use Internet-Drafts as reference 41 material or to cite them other than as "work in progress." 43 This Internet-Draft will expire on April 27, 2015. 45 Copyright Notice 47 Copyright (c) 2014 IETF Trust and the persons identified as the 48 document authors. All rights reserved. 50 This document is subject to BCP 78 and the IETF Trust's Legal 51 Provisions Relating to IETF Documents 52 (http://trustee.ietf.org/license-info) in effect on the date of 53 publication of this document. Please review these documents 54 carefully, as they describe your rights and restrictions with respect 55 to this document. Code Components extracted from this document must 56 include Simplified BSD License text as described in Section 4.e of 57 the Trust Legal Provisions and are provided without warranty as 58 described in the Simplified BSD License. 60 Table of Contents 62 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 63 1.1. APN Selection . . . . . . . . . . . . . . . . . . . . . . 4 64 1.2. Multiple APN Connectivity . . . . . . . . . . . . . . . . 4 65 1.3. Wi-Fi to E-UTRAN mobility . . . . . . . . . . . . . . . . 4 66 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 67 3. Protocol Overview . . . . . . . . . . . . . . . . . . . . . . 5 68 3.1. Brief Introduction to EAP . . . . . . . . . . . . . . . . 5 69 3.2. IEEE 802.11 Authentication using EAP over 802.1X . . . . 5 70 4. New EAP Attributes . . . . . . . . . . . . . . . . . . . . . 7 71 4.1. APN Selection . . . . . . . . . . . . . . . . . . . . . . 7 72 4.2. Connectivity Type . . . . . . . . . . . . . . . . . . . . 7 73 4.3. Wi-Fi to UTRAN/E-UTRAN Mobility . . . . . . . . . . . . . 8 74 4.4. MN Serial ID . . . . . . . . . . . . . . . . . . . . . . 8 75 5. Attribute Extensions . . . . . . . . . . . . . . . . . . . . 8 76 5.1. AT_VIRTUAL_NETWORK_ID . . . . . . . . . . . . . . . . . . 8 77 5.2. AT_VIRTUAL_NETWORK_REQ . . . . . . . . . . . . . . . . . 9 78 5.3. AT_CONNECTIVITY_TYPE . . . . . . . . . . . . . . . . . . 10 79 5.4. AT_HANDOVER_INDICATION . . . . . . . . . . . . . . . . . 11 80 5.5. AT_HANDOVER_SESSION_ID . . . . . . . . . . . . . . . . . 11 81 5.6. AT_MN_SERIAL_ID . . . . . . . . . . . . . . . . . . . . . 12 82 6. Security Considerations . . . . . . . . . . . . . . . . . . . 13 83 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14 84 8. Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . 15 85 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 15 86 9.1. Normative References . . . . . . . . . . . . . . . . . . 15 87 9.2. Informative References . . . . . . . . . . . . . . . . . 15 88 Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 17 89 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18 91 1. Introduction 93 Wi-Fi has emerged as a trusted access technology for mobile service 94 providers. Advances in IEEE 802.11u [IEEE802.11u] and "HotSpot 2.0" 95 [hs20] have enabled seamless roaming, in which a Mobile Node can 96 select and connect to a Wi-Fi access network just as it would roam 97 into a cellular network. It has thus become important to provide 98 certain functions in Wi-Fi which are commonly supported in licensed- 99 spectrum networks such as 3G and 4G networks. This draft specifies a 100 few new EAP attributes for a Mobile Node (MN) to interact with the 101 network to support some of these functions (see below). These new 102 attributes serve as a trigger for Proxy Mobile IPv6 network nodes to 103 undertake the relevant mobility operations. For instance, when the 104 Mobile Node requests and the network agrees for a new IP session 105 (i.e., a new Access Point Name or APN in 3GPP), the corresponding 106 attribute (defined below) acts as a trigger for the Mobile Anchor 107 Gateway (MAG) to initiate a new mobility session with the Local 108 Mobility Anchor (LMA). This document refers to [RFC6459] for the 109 basic definitions of mobile network terminology (such as APN) used 110 here. 112 The 3rd Generation Partnership Project (3GPP) networks support many 113 functions that are not commonly implemented in a Wi-Fi network. This 114 document defines EAP attributes that enable the following functions 115 in trusted Wi-Fi access networks using EAP-AKA' [RFC5448] and EAP-AKA 116 [RFC4187]: 118 o APN Selection 120 o Multiple APN Connectivity 122 o Wi-Fi to 3G/4G (UTRAN/EUTRAN) mobility 124 The attributes defined here are exchanged between the Mobile Node and 125 the EAP server, typically realized as part of the AAA server 126 infrastructure in a service provider's infrastructure. In 127 particular, the Wi-Fi access network simply conveys the attributes to 128 the service provider's core network where the EAP processing takes 129 place [EPC]. Since these attributes share the same IANA registry, 130 the methods are applicable to EAP-AKA', EAP-AKA, EAP-SIM [RFC4186] 131 and, with appropriate extensions, are possibly applicable for other 132 EAP methods as well. In addition to the trusted Wi-Fi access 133 networks, the attributes are applicable to any trusted "non-3GPP" 134 access network that uses the EAP methods and provides connectivity to 135 the mobile EPC, which provides connectivity for 3G, 4G, and other 136 non-3GPP access networks [EPC]. 138 1.1. APN Selection 140 The 3GPP networks support the concept of an APN (Access Point Name). 141 This is defined in [GPRS]. Each APN is an independent IP network 142 with its own set of IP services. When the MN attaches to the 143 network, it may select a specific APN to receive desired services. 144 For example, to receive generic Internet services, a user device may 145 select APN "Internet" and to receive IMS voice services, it may 146 select APN "IMSvoice". 148 In a Wi-Fi access scenario, an MN needs a way of sending the desired 149 APN name to the network. This draft specifies a new attribute to 150 propagate the APN information via EAP. The agreed APN is necessary 151 for the Proxy Mobile IPv6 MAG to initiate a new session with the LMA. 153 1.2. Multiple APN Connectivity 155 As an extension of APN Selection, an MN may choose to connect to 156 multiple IP networks simultaneously. 3GPP provides this feature via 157 additional Packet Data Protocol (PDP) contexts or additional Packet 158 Data Network (PDN) connections, and defines the corresponding set of 159 signaling procedures. In a trusted Wi-Fi network, an MN connects to 160 the first APN via DHCPv4 or IPv6 Router Solicitation. This document 161 specifies an attribute that indicates the MN's capability to support 162 multiple APN connectivity. The specific connectivity types are also 163 necessary for the Proxy Mobile IPv6 signaling. 165 1.3. Wi-Fi to E-UTRAN mobility 167 When operating in a multi-access network, an MN may want to 168 gracefully handover its IP attachment from one access network to 169 another. For instance, an MN connected to a 3GPP E-UTRAN network may 170 choose to move its connectivity to a trusted Wi-Fi network. 171 Alternatively, the MN may choose to connect using both access 172 technologies simultaneously, and maintain two independent IP 173 attachments. To implement these scenarios, the MN needs a way to 174 correlate the UTRAN/E-UTRAN session with the new Wi-Fi session. This 175 draft specifies an attribute to propagate E-UTRAN session 176 identification to the network via EAP. This helps the network to 177 correlate the sessions between the two Radio Access Network 178 technologies and thus helps the overall handover process. 180 2. Terminology 182 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 183 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 184 document are to be interpreted as described in [RFC2119]. 186 3. Protocol Overview 188 3.1. Brief Introduction to EAP 190 EAP is defined as a generic protocol in [RFC3748]. EAP, combined 191 with one of the payload protocols such as EAP-AKA' [RFC5448] can 192 accomplish several things in a network: 194 o Establish identity of the user (MN) to the network. 196 o Authenticate the user during the first attach with the help of an 197 authentication center that securely maintains the user 198 credentials. This process is called EAP Authentication. 200 o Re-authenticate the user periodically, but without the overhead of 201 a round-trip to the authentication center. This process is called 202 EAP Fast Re-Authentication. 204 This draft makes use of the EAP Authentication procedure. The use of 205 EAP Fast Re-Authentication procedure is for further study. Both the 206 EAP Authentication and EAP Fast Re-Authentication procedures are 207 specified for trusted access network use in 3GPP. [TS-33.402] 209 3.2. IEEE 802.11 Authentication using EAP over 802.1X 211 In a Wi-Fi network, EAP is carried over the IEEE 802.1X 212 Authentication protocol. The IEEE 802.1X Authentication is a 213 transparent, payload-unaware mechanism to carry the authentication 214 messages between the MN and the Wi-Fi network elements. 216 EAP, on the other hand, has multiple purposes. Apart from its core 217 functions of communicating an MN's credentials to the network and 218 proving the MN's identity, it also allows the MN to send arbitrary 219 information elements to help establish the MN's IP session in the 220 network. The following figure shows an example end-to-end EAP flow 221 in the context of an IEEE 802.11 Wi-Fi network. We first define the 222 terminology: 224 o MN: Mobile Node 226 o WAP: Wi-Fi Access Point 228 o WAC: Wi-Fi Access Controller. In a PMIPv6 [RFC5213] network, 229 hosts the MAG functionality or is assumed to have a suitable 230 interface to the MAG. In the following, we simply use "WAC" 231 notation. The MAG functionality within the WAC (or within the Wi- 232 Fi access network), or a suitable interface to the MAG is assumed 233 for PMIPv6 deployments. 235 o IPCN: IP Core Network. This includes the LMA function. It 236 generically also includes the AAA server function. 238 MN WAP WAC IPCN 239 (MAG) (LMA) 240 1)|<----------Beacon--------| | | 241 2)|<----------Probe-------->| | | 242 | | | | 243 | 802.11 Auth| (Open System) | | 244 3)|<----------------------->|<----------------------->| | 245 | | | | 246 | 802.11 | Association | | 247 4)|<----------------------->|<----------------------->| | 248 | | | | 249 | (802.1X) | (CAPWAP/802.1X) | | 250 5)|<----EAP Req/Identity----|<----EAP Req/Identity----| | 251 | | | | 252 6)|----EAP Resp/Identity--->|----EAP Resp/Identity--->| | 253 | | | | 254 7)|<-EAP Req/AKA-Challenge--|<-EAP Req/AKA-Challenge--| | 255 | | | | 256 8)|-EAP Resp/AKA-Challenge->|-EAP Resp/AKA-Challenge->| | 257 | | | | 258 9)|<-----EAP Success--------|<-----EAP Success--------| | 259 | | | | 260 10)|<====== 802.11 Data ====>|<=== CAPWAP(802.3 Data)=>|<=Tunnel to=>| 261 | | | core network| 262 | | | | 264 Figure 1: Example EAP Deployment 266 The figure shows separate Wi-Fi Access Point and Wi-Fi Access 267 Controller, following the split-MAC model of CAPWAP [RFC5415]. A 268 particular deployment may have the two functions within a single 269 node. 271 1. An MN detects a beacon from a WAP in the vicinity. 273 2. The MN probes the WAP to determine suitability to attach (Verify 274 SSID list, authentication type and so on). 276 3. The MN initiates the IEEE 802.11 Authentication with the Wi-Fi 277 network. In WPA/WPA2 mode, this is an open authentication 278 without any security credential verification. 280 4. The MN initiates 802.11 Association with the Wi-Fi network. 282 5. The Wi-Fi network initiates 802.1X/EAP Authentication procedures 283 by sending EAP Request/Identity. 285 6. The MN responds with its permanent or temporary identity. 287 7. The Wi-Fi network challenges the MN to prove its identity by 288 sending EAP Request/AKA-Challenge. 290 8. The MN calculates the security digest and responds with EAP 291 Response/AKA-Challenge. 293 9. If the authentication is successful, the Wi-Fi network responds 294 to the MN with EAP Success. 296 10. An end-to-End data path is available for the MN to start IP 297 layer communication (DHCPv4, IPv6 Router Solicitation and so 298 on). 300 4. New EAP Attributes 302 The following sections define the new EAP attributes and their usage. 304 4.1. APN Selection 306 In a Wi-Fi network, an MN includes the AT_VIRTUAL_NETWORK_ID 307 attribute in the EAP-Response/AKA-Challenge to indicate the desired 308 APN identity for the first PDN connection. 310 If the MN does not include the AT_VIRTUAL_NETWORK_ID attribute in the 311 EAP-Response/AKA-Challenge, the network may select an APN by other 312 means. This selection mechanism is outside the scope of this 313 document. 315 An MN includes the AT_VIRTUAL_NETWORK_REQ attribute to indicate 316 single or multiple PDN capability. In addition, a sub-type in the 317 attribute indicates IPv4, IPv6, or dual IPv4v6 PDN connectivity. 319 4.2. Connectivity Type 321 An MN indicates its preference for connectivity using the 322 AT_CONNECTIVITY_TYPE attribute in the EAP-Response/AKA-Challenge 323 message. The preference indicates whether the MN wishes connectivity 324 to the Evolved Packet Core (the so-called "EPC PDN connectivity") or 325 Internet Offload (termed as "Non-Seamless Wireless Offload"). 327 The network makes its decision and replies with the same attribute in 328 the EAP Success message. 330 4.3. Wi-Fi to UTRAN/E-UTRAN Mobility 332 When a multi-access MN enters a Wi-Fi network, the following 333 parameters are applicable in the EAP-Response/AKA-Challenge for IP 334 session continuity from UTRAN/E-UTRAN. 336 o AT_HANDOVER_INDICATION: This attribute indicates to the network 337 that the MN intends to continue the IP session from UTRAN/E-UTRAN. 338 If a previous session can be located, network will honor this 339 request by connecting the Wi-Fi access to the existing IP session. 341 o AT_HANDOVER_SESSION_ID: An MN MAY use this attribute to identify 342 the session on UTRAN/E-UTRAN. If used, this attribute contains 343 P-TMSI (Packet Temporary Mobile Subscriber Identity) if the 344 previous session was on UTRAN or M-TMSI (Mobile Temporary Mobile 345 Subscriber Identity) if the previous session was on E-UTRAN. This 346 attribute helps the network correlate the Wi-Fi session to an 347 existing UTRAN/E-UTRAN session. 349 4.4. MN Serial ID 351 The MN_SERIAL_ID attribute defines an MN's serial number, including 352 International Mobile Equipment Identity (IMEI) and International 353 Mobile Equipment Identity Software Version (IMEISV). The IMEI (or 354 IMEISV) is used for ensuring a legitimate (and not a stolen) device 355 is in use. As with the others, this attribute is exchanged with the 356 service provider's AAA server. The MN_SERIAL_ID MUST NOT be 357 propagated further by the AAA server to any other node. 359 5. Attribute Extensions 361 The format for the new attributes follows that in [RFC4187]. Note 362 that the Length field value is inclusive of the first two bytes. 364 5.1. AT_VIRTUAL_NETWORK_ID 366 The AT_VIRTUAL_NETWORK_ID attribute identifies the virtual IP network 367 that the MN intends to attach to. The implementation of the virtual 368 network on the core network side is technology specific. For 369 instance, in a 3GPP network, the virtual network is implemented based 370 on the 3GPP APN primitive. 372 This attribute SHOULD be included in the EAP-Response/AKA-Challenge 373 message. 375 0 1 2 3 376 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 1 377 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 378 |AT_VIRTUAL | Length | Virtual Network Id | 379 | _NETWORK_ID | | | 380 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 381 | Virtual Network Id | 382 | | 383 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 385 Figure 2: AT_VIRTUAL_NETWORK_ID EAP Attribute 387 Virtual Network Id: 389 An arbitrary octet string that identifies a virtual network in the 390 access technology the MN is attaching to. For instance, in 3GPP 391 E-UTRAN, this could be an APN. See [TS-23.003] for encoding of the 392 field. 394 5.2. AT_VIRTUAL_NETWORK_REQ 396 When an MN intends to connect an APN, it SHOULD use this attribute to 397 indicate different capabilities to the network. In turn, the network 398 provides what is supported. 400 From the MN, this attribute can be included only in EAP-Response/ 401 Identity. From the network, it SHOULD be included in the EAP 402 Request/AKA-Challenge message. In the MN-to-network direction, the 403 Type field (below) indicates the MN's request. In the network-to-MN 404 direction, the Type field indicates network's willingness to support 405 the request; a present Type field value indicates the network support 406 for that Type. 408 0 1 2 3 409 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 1 410 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 411 |AT_VIRTUAL_ | Length | Virt-Net-Req | Virt-Net-Req | 412 |NETWORK_REQ | | Type | Sub-type | 413 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 415 Figure 3: AT_VIRTUAL_NETWORK_REQ EAP Attribute 417 Virt-Net-Req Type: 419 Type can have one of the following values: 421 o TBA IANA: Reserved 422 o TBA IANA: Single PDN connection 424 o TBA IANA : Multiple PDN connection. Can request Non-Seamless Wi- 425 Fi Offload or EPC connectivity (see the Connectivity Type 426 attribute below) 428 Virt-Net-Req Sub-type: 430 Sub-type can have one of the following values: 432 o TBA IANA : Reserved 434 o TBA IANA : PDN Type: IPv4 436 o TBA IANA : PDN Type: IPv6 438 o TBA IANA : PDN Type: IPv4v6 440 5.3. AT_CONNECTIVITY_TYPE 442 An MN uses this attribute to indicate whether it wishes the 443 connectivity type to be Non-Seamless WLAN Offload or EPC. This 444 attribute is applicable for multiple PDN connections only. 446 From the MN, this attribute can be included only in EAP-Response/ 447 Identity. From the network, it SHOULD be included in the EAP 448 Request/AKA-Challenge message. 450 0 1 2 3 451 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 1 452 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 453 |AT_CONNECTIVITY| Length | Connectivity | Reserved | 454 |_TYPE | | Type | | 455 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 457 Figure 4: AT_CONNECTIVITY_TYPE EAP Attribute 459 Connectivity Type: 461 Connectivity Type can have one of the following values: 463 o TBA IANA : Reserved 465 o TBA IANA : Non-Seamless WLAN Offload (NSWO) 467 o TBA IANA : EPC PDN connectivity 469 5.4. AT_HANDOVER_INDICATION 471 This attribute indicates an MN's handover intention of an existing IP 472 attachment. 474 This attribute SHOULD be included in the EAP-Response/AKA-Challenge 475 message. 477 0 1 2 3 478 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 1 479 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 480 |AT_HANDOVER_IND| Length | Handover | Pad | 481 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 483 Figure 5: AT_HANDOVER_INDICATION EAP Attribute 485 Handover Type: 487 o 0 - the MN has no intention of handing over an existing IP 488 session, i.e., the MN is requesting an independent IP session with 489 the Wi-Fi network without disrupting the IP session with the 490 UTRAN/E-UTRAN. In this case, no Session Id (Section 5.5) is 491 included. 493 o 1 - the MN intends to handover an existing IP session. In this 494 case, MN MAY include a Session Id (Section 5.5) to correlate this 495 Wi-Fi session with a UTRAN/E-UTRAN session. 497 5.5. AT_HANDOVER_SESSION_ID 499 When an MN intends to handover an earlier IP session to the current 500 access network, it may propagate a session identity that can help 501 identify the previous session from UTRAN/E-UTRAN that the MN intends 502 to handover. This attribute is defined as a generic octet string. 503 The MN MAY include an E-UTRAN GUTI if the previous session was an 504 E-UTRAN session. If the previous session was a UTRAN session, the MN 505 MAY include UTRAN Global RNC ID (MCC, MNC, RNC Id) and P-TMSI 506 concatenated as an octet string. 508 This attribute SHOULD be included in the EAP-Response/AKA-Challenge 509 message. 511 0 1 2 3 512 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 1 513 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 514 |AT_HANDOVER_ | Length | Access | Reserved | 515 | SESSION_ID | | Technology | | 516 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 517 | Session Id | 518 | ... | 519 | ... | 520 | | 521 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 523 Figure 6: AT_HANDOVER_SESSION_ID EAP Attribute 525 Access Technology: 527 This field represents the RAN technology from which the MN is 528 undergoing a handover. 530 o TBA IANA: Reserved 532 o TBA IANA: UTRAN 534 o TBA IANA: E-UTRAN 536 Session Id: 538 An octet string of variable length that identifies the session in the 539 source access technology. As defined at the beginning of this 540 section, the actual value is RAN technology dependent. For E-UTRAN, 541 the value is GUTI. For UTRAN, the value is Global RNC Id (6 bytes) 542 followed by P-TMSI (4 bytes). See [TS-23.003] for encoding of the 543 field. 545 5.6. AT_MN_SERIAL_ID 547 This attribute defines the MN's machine serial number. Examples are 548 International Mobile Equipment Identity (IMEI) and International 549 Mobile Equipment Identity Software Version (IMEISV). 551 The network SHOULD send a request for the attribute in EAP-Request/ 552 AKA-Challenge message. 554 If the request is present, The MN SHOULD include the attribute in the 555 EAP-Response/AKA-Challenge message. 557 0 1 2 3 558 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 1 559 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 560 |AT_MN_ | Length | Serial ID | Reserved | 561 | SERIAL_ID | | Type | | 562 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 563 | MN Serial Id | 564 | | 565 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 567 Figure 7: AT_MN_SERIAL_ID EAP Attribute 569 Serial ID Type: 571 This field identifies the type of the MN Identifier. 573 o TBA IANA: Reserved 575 o TBA IANA: IMEI 577 o TBA IANA: IMEISV 579 MN Serial Id: 581 An arbitrary octet string that identifies the MN's machine serial 582 number. The actual value is device-specific. See [TS-23.003] for 583 encoding of the field. When sent by the network in the EAP-Request/ 584 AKA-Challenge message, this field is not present, which serves as an 585 indication for the MN to provide the attribute in the EAP-Response/ 586 AKA-Challenge message. 588 6. Security Considerations 590 This document defines new EAP attributes to extend the capability of 591 the EAP-AKA protocol as specified in Section 8.2 of [RFC4187]. The 592 attributes are passed between an MN and a AAA server in provider- 593 controlled trusted Wi-Fi networks. The document does not specify any 594 new messages or options to the EAP-AKA protocol. 596 The attributes defined here are fields which are used in existing 597 trusted 3G and 4G networks, where they are exchanged (in protocols 598 specific to 3G and 4G networks) subsequent to the mobile network 599 authentication (e.g., using the UMTS-AKA mechanism). For the 600 operator-controled Wi-Fi access which is connected to the same core 601 infrastructure as the 3G and 4G access, similar model is followed 602 here with the EAP-AKA (or EAP-AKA', EAP-SIM) authentication. In 603 doing so, these attribute processing, security-wise, is no worse than 604 that in existing 3G and 4G mobile networks. 606 The attributes inherit the security protection (integrity, replay, 607 and confidentiality) provided by the paratmeters in the AKA(') or SIM 608 methods ; see Section 12.6 in [RFC4187]. Furthermore, RFC 4187 609 requires attributes exchanged in EAP-Request/AKA-Identity or EAP- 610 Response/AKA-Identity to be integrity-protected with AT_CHECKCODE; 611 see Section 8.2 in [RFC4187]. This requirement applies to the 612 AT_CONNECTIVITY_TYPE and AT_VIRTUAL_NETWORK_REQ attributes defined in 613 this document. 615 The AT_MN_SERIAL_ID attribute MUST have confidentiality protection 616 provided by the AKA(') or SIM methods beyond the secure transport 617 (such as private leased lines, VPN etc.) deployed by the provider of 618 the trusted Wi-Fi service. 620 7. IANA Considerations 622 This document defines the following new skippable EAP-AKA attributes. 623 These attributes need assignments from the "EAP-AKA and EAP-SIM 624 Parameters" registry at https://www.iana.org/assignments/eapsimaka- 625 numbers 627 o AT_VIRTUAL_NETWORK_ID (Section 5.1) - TBA by IANA 629 o AT_VIRTUAL_NETWORK_REQ (Section 5.2) - TBA by IANA 631 o AT_CONNECTIVITY_TYPE (Section 5.3) - TBA IANA 633 o AT_HANDOVER_INDICATION (Section 5.4) - TBA by IANA 635 o AT_HANDOVER_SESSION_ID (Section 5.5) - TBA by IANA 637 o AT_MN_SERIAL_ID (Section 5.6) - TBA by IANA 639 This document requests a new IANA registry "Trusted non-3GPP Access 640 EAP Parameters". The range for both Types and Sub types in the 641 registry is 0 - 127, with 0 (zero) being a reserved value. The 642 document requests IANA to make assignments in a monotonically 643 increasing order in increments of 1, starting from 1. New 644 assignments in this registry are made with the Specification Required 645 policy [RFC5226]. 647 The IANA Designated Expert should review the requirements for new 648 assignments based on factors including, but not limited to, the 649 source of request (e.g., standards bodies), deployment needs (e.g., 650 industry consortium, operator community) and experimental needs 651 (e.g., academia, industrial labs). A document outlining the purpose 652 of new assignments should accompany the request. Such a document 653 could be a standards document, or a research project description. 655 The Designated Expert should consider that there is sufficient 656 evidence of potential usage both on the end-points (e.g., Mobile 657 Devices etc.) and the infrastructure (e.g., AAA servers, gateways 658 etc.) 660 The document requests assignments from the new registry for the 661 following fields defined in this document: 663 o Virt-Net-Req Type (Section 5.2) - TBA by IANA 665 o Virt-Net-Req Sub type (Section 5.2) - TBA by IANA 667 o Connectivity Type (Section 5.3) - TBA IANA 669 o Access Technology (Section 5.5) - TBA by IANA 671 o Serial ID Type (Section 5.6) - TBA by IANA 673 8. Acknowledgment 675 Thanks to Sebastian Speicher for the review and suggesting 676 improvements. Thanks to Mark Grayson for proposing the MN Serial ID 677 attribute. And, thanks to Brian Haberman for suggesting a new 678 registry. 680 9. References 682 9.1. Normative References 684 [RFC4187] Arkko, J. and H. Haverinen, "Extensible Authentication 685 Protocol Method for 3rd Generation Authentication and Key 686 Agreement (EAP-AKA)", RFC4187, January 2006, 687 . 689 [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an 690 IANA Considerations Section in RFCs", BCP 26, RFC 5226, 691 May 2008. 693 [RFC6459] Korhonen, J., Soininen, J., Patil, B., Savolainen, T., 694 Bajko, G., and K. Iisakkila, "IPv6 in 3rd Generation 695 Partnership Project (3GPP) Evolved Packet System (EPS)", 696 RFC 6459, January 2012. 698 9.2. Informative References 700 [EPC] "General Packet Radio Service (GPRS); enhancements for 701 Evolved Universal Terrestrial Radio Access Network 702 (E-UTRAN) access, 3GPP TS 23.401 8.8.0, December 2009.", 703 . 705 [GPRS] "General Packet Radio Service (GPRS); Service description, 706 Stage 2, 3GPP TS 23.060, December 2006", 707 . 709 [IEEE802.11u] 710 "802.11u-2011 - IEEE Standard for Information Technology- 711 Telecommunications and information exchange between 712 systems- Local and Metropolitan networks-specific 713 requirements- Part II: Wireless LAN Medium Access Control 714 (MAC) and Physical Layer (PHY) specifications: Amendment 715 9: Interworking with External Networks", , Feb 2011, 716 . 719 [RFC3748] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. 720 Levkowetz, Ed., "Extensible Authentication Protocol 721 (EAP)", RFC3748, June 2004, 722 . 724 [RFC4186] Haverinen, H. and J. Salowey, "Extensible Authentication 725 Protocol Method for Global System for Mobile 726 Communications (GSM) Subscriber Identity Modules (EAP- 727 SIM)", RFC 4186, January 2006. 729 [RFC5213] Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K., 730 and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008. 732 [RFC5415] Calhoun, P., Montemurro, M., and D. Stanley, "Control And 733 Provisioning of Wireless Access Points (CAPWAP) Protocol 734 Specification", RFC5415, January 2009, 735 . 737 [RFC5448] Arkko, J., Lehtovirta, V., and P. Eronen, "Improved 738 Extensible Authentication Protocol Method for 3rd 739 Generation Authentication and Key Agreement (EAP-AKA')", 740 RFC 5448, May 2009. 742 [TS-23.003] 743 "3rd Generation Partnership Project: Numbering, Addressing 744 and Identification, 3GPP TS 23.003 12.2.0, March 2014.", , 745 . 747 [TS-33.402] 748 "3GPP System Architecture Evolution (SAE); Security 749 aspects of non-3GPP accesses, 3GPP TS 33.402 8.6.0, 750 December 2009.", , 751 . 753 [hs20] "Hotspot 2.0 (Release 2) Technical Specification Package 754 v1.0.0", , . 757 Appendix A. Change Log 759 o: Initial Draft 761 o: v01: status to Informational, Updated References, Revised the 762 Figure 764 o: No changes from 01 to 02 766 o: Per recent 3GPP updates, added the Connectivity Type attribute 767 to allow indicating Non-Seamless WLAN Offload or EPC connectivity 769 o: version-04: Revised AT_VIRTUAL_NETWORK_REQ to include 1) single 770 PDN vs Multiple PDN connections, 2) PDN Types, and referred to 771 NSWO Connectivity Type attribute 773 o: version 05: Added AT_MN_SERIAL_ID. Revised the IANA 774 Considerations section 776 o: version 06, 07: various edits 778 o: AD review revs 780 o: version 09: IETF LC, Directorate review revs 782 o: IANA Section revision, based on IANA interaction 784 o: version 12 - clarified/revised: 1) IMEI purpose, 2) attributes 785 requirement in PMIP6 signaling, 3) references to 802.11u, HotSpot 786 2.0 (seamless roaming) 4) References (normative/informative), 5) 787 editorial corrections 789 o: version 13 - revised AT_MN_SERIAL_ID processing per IESG 790 DISCUSS 792 Authors' Addresses 794 Ravi Valmikam 795 Unaffiliated 796 USA 798 Email: valmikam@gmail.com 800 Rajeev Koodli 801 Intel 802 USA 804 Email: rajeev.koodli@intel.com