1 /* 2 * hostapd / EAP-PAX (RFC 4746) server 3 * Copyright (c) 2005-2007, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/random.h" 13 #include "eap_server/eap_i.h" 14 #include "eap_common/eap_pax_common.h" 15 16 /* 17 * Note: only PAX_STD subprotocol is currently supported 18 * 19 * TODO: Add support with PAX_SEC with the mandatory to implement ciphersuite 20 * (HMAC_SHA1_128, IANA DH Group 14 (2048 bits), RSA-PKCS1-V1_5) and 21 * recommended ciphersuite (HMAC_SHA256_128, IANA DH Group 15 (3072 bits), 22 * RSAES-OAEP). 23 */ 24 25 struct eap_pax_data { 26 enum { PAX_STD_1, PAX_STD_3, SUCCESS, FAILURE } state; 27 u8 mac_id; 28 union { 29 u8 e[2 * EAP_PAX_RAND_LEN]; 30 struct { 31 u8 x[EAP_PAX_RAND_LEN]; /* server rand */ 32 u8 y[EAP_PAX_RAND_LEN]; /* client rand */ 33 } r; 34 } rand; 35 u8 ak[EAP_PAX_AK_LEN]; 36 u8 mk[EAP_PAX_MK_LEN]; 37 u8 ck[EAP_PAX_CK_LEN]; 38 u8 ick[EAP_PAX_ICK_LEN]; 39 u8 mid[EAP_PAX_MID_LEN]; 40 int keys_set; 41 char *cid; 42 size_t cid_len; 43 }; 44 45 46 static void * eap_pax_init(struct eap_sm *sm) 47 { 48 struct eap_pax_data *data; 49 50 data = os_zalloc(sizeof(*data)); 51 if (data == NULL) 52 return NULL; 53 data->state = PAX_STD_1; 54 /* 55 * TODO: make this configurable once EAP_PAX_HMAC_SHA256_128 is 56 * supported 57 */ 58 data->mac_id = EAP_PAX_MAC_HMAC_SHA1_128; 59 60 return data; 61 } 62 63 64 static void eap_pax_reset(struct eap_sm *sm, void *priv) 65 { 66 struct eap_pax_data *data = priv; 67 os_free(data->cid); 68 bin_clear_free(data, sizeof(*data)); 69 } 70 71 72 static struct wpabuf * eap_pax_build_std_1(struct eap_sm *sm, 73 struct eap_pax_data *data, u8 id) 74 { 75 struct wpabuf *req; 76 struct eap_pax_hdr *pax; 77 u8 *pos; 78 79 wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)"); 80 81 if (random_get_bytes(data->rand.r.x, EAP_PAX_RAND_LEN)) { 82 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); 83 data->state = FAILURE; 84 return NULL; 85 } 86 87 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX, 88 sizeof(*pax) + 2 + EAP_PAX_RAND_LEN + 89 EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id); 90 if (req == NULL) { 91 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " 92 "request"); 93 data->state = FAILURE; 94 return NULL; 95 } 96 97 pax = wpabuf_put(req, sizeof(*pax)); 98 pax->op_code = EAP_PAX_OP_STD_1; 99 pax->flags = 0; 100 pax->mac_id = data->mac_id; 101 pax->dh_group_id = EAP_PAX_DH_GROUP_NONE; 102 pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; 103 104 wpabuf_put_be16(req, EAP_PAX_RAND_LEN); 105 wpabuf_put_data(req, data->rand.r.x, EAP_PAX_RAND_LEN); 106 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)", 107 data->rand.r.x, EAP_PAX_RAND_LEN); 108 109 pos = wpabuf_put(req, EAP_PAX_MAC_LEN); 110 if (eap_pax_mac(data->mac_id, (u8 *) "", 0, 111 wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN, 112 NULL, 0, NULL, 0, pos) < 0) { 113 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to calculate ICV"); 114 data->state = FAILURE; 115 wpabuf_free(req); 116 return NULL; 117 } 118 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); 119 120 return req; 121 } 122 123 124 static struct wpabuf * eap_pax_build_std_3(struct eap_sm *sm, 125 struct eap_pax_data *data, u8 id) 126 { 127 struct wpabuf *req; 128 struct eap_pax_hdr *pax; 129 u8 *pos; 130 131 wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)"); 132 133 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX, 134 sizeof(*pax) + 2 + EAP_PAX_MAC_LEN + 135 EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id); 136 if (req == NULL) { 137 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " 138 "request"); 139 data->state = FAILURE; 140 return NULL; 141 } 142 143 pax = wpabuf_put(req, sizeof(*pax)); 144 pax->op_code = EAP_PAX_OP_STD_3; 145 pax->flags = 0; 146 pax->mac_id = data->mac_id; 147 pax->dh_group_id = EAP_PAX_DH_GROUP_NONE; 148 pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; 149 150 wpabuf_put_be16(req, EAP_PAX_MAC_LEN); 151 pos = wpabuf_put(req, EAP_PAX_MAC_LEN); 152 if (eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, 153 data->rand.r.y, EAP_PAX_RAND_LEN, 154 (u8 *) data->cid, data->cid_len, NULL, 0, pos) < 0) { 155 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to calculate MAC"); 156 data->state = FAILURE; 157 wpabuf_free(req); 158 return NULL; 159 } 160 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)", 161 pos, EAP_PAX_MAC_LEN); 162 163 /* Optional ADE could be added here, if needed */ 164 165 pos = wpabuf_put(req, EAP_PAX_MAC_LEN); 166 if (eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, 167 wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN, 168 NULL, 0, NULL, 0, pos) < 0) { 169 wpa_printf(MSG_ERROR, "EAP-PAX: Failed to calculate ICV"); 170 data->state = FAILURE; 171 wpabuf_free(req); 172 return NULL; 173 } 174 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); 175 176 return req; 177 } 178 179 180 static struct wpabuf * eap_pax_buildReq(struct eap_sm *sm, void *priv, u8 id) 181 { 182 struct eap_pax_data *data = priv; 183 184 switch (data->state) { 185 case PAX_STD_1: 186 return eap_pax_build_std_1(sm, data, id); 187 case PAX_STD_3: 188 return eap_pax_build_std_3(sm, data, id); 189 default: 190 wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown state %d in buildReq", 191 data->state); 192 break; 193 } 194 return NULL; 195 } 196 197 198 static Boolean eap_pax_check(struct eap_sm *sm, void *priv, 199 struct wpabuf *respData) 200 { 201 struct eap_pax_data *data = priv; 202 struct eap_pax_hdr *resp; 203 const u8 *pos; 204 size_t len, mlen; 205 u8 icvbuf[EAP_PAX_ICV_LEN], *icv; 206 207 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); 208 if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN) { 209 wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame"); 210 return TRUE; 211 } 212 213 mlen = sizeof(struct eap_hdr) + 1 + len; 214 resp = (struct eap_pax_hdr *) pos; 215 216 wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x " 217 "flags 0x%x mac_id 0x%x dh_group_id 0x%x " 218 "public_key_id 0x%x", 219 resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id, 220 resp->public_key_id); 221 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload", 222 (u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN); 223 224 if (data->state == PAX_STD_1 && 225 resp->op_code != EAP_PAX_OP_STD_2) { 226 wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - " 227 "ignore op %d", resp->op_code); 228 return TRUE; 229 } 230 231 if (data->state == PAX_STD_3 && 232 resp->op_code != EAP_PAX_OP_ACK) { 233 wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - " 234 "ignore op %d", resp->op_code); 235 return TRUE; 236 } 237 238 if (resp->op_code != EAP_PAX_OP_STD_2 && 239 resp->op_code != EAP_PAX_OP_ACK) { 240 wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x", 241 resp->op_code); 242 } 243 244 if (data->mac_id != resp->mac_id) { 245 wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, " 246 "received 0x%x", data->mac_id, resp->mac_id); 247 return TRUE; 248 } 249 250 if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) { 251 wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, " 252 "received 0x%x", EAP_PAX_DH_GROUP_NONE, 253 resp->dh_group_id); 254 return TRUE; 255 } 256 257 if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) { 258 wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, " 259 "received 0x%x", EAP_PAX_PUBLIC_KEY_NONE, 260 resp->public_key_id); 261 return TRUE; 262 } 263 264 if (resp->flags & EAP_PAX_FLAGS_MF) { 265 /* TODO: add support for reassembling fragments */ 266 wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported"); 267 return TRUE; 268 } 269 270 if (resp->flags & EAP_PAX_FLAGS_CE) { 271 wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag"); 272 return TRUE; 273 } 274 275 if (data->keys_set) { 276 if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) { 277 wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet"); 278 return TRUE; 279 } 280 icv = wpabuf_mhead_u8(respData) + mlen - EAP_PAX_ICV_LEN; 281 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN); 282 if (eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, 283 wpabuf_mhead(respData), 284 wpabuf_len(respData) - EAP_PAX_ICV_LEN, 285 NULL, 0, NULL, 0, icvbuf) < 0 || 286 os_memcmp_const(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) { 287 wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV"); 288 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", 289 icvbuf, EAP_PAX_ICV_LEN); 290 return TRUE; 291 } 292 } 293 294 return FALSE; 295 } 296 297 298 static void eap_pax_process_std_2(struct eap_sm *sm, 299 struct eap_pax_data *data, 300 struct wpabuf *respData) 301 { 302 struct eap_pax_hdr *resp; 303 u8 mac[EAP_PAX_MAC_LEN], icvbuf[EAP_PAX_ICV_LEN]; 304 const u8 *pos; 305 size_t len, left, cid_len; 306 int i; 307 308 if (data->state != PAX_STD_1) 309 return; 310 311 wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX_STD-2"); 312 313 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); 314 if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN) 315 return; 316 317 resp = (struct eap_pax_hdr *) pos; 318 pos = (u8 *) (resp + 1); 319 left = len - sizeof(*resp); 320 321 if (left < 2 + EAP_PAX_RAND_LEN || 322 WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { 323 wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (B)"); 324 return; 325 } 326 pos += 2; 327 left -= 2; 328 os_memcpy(data->rand.r.y, pos, EAP_PAX_RAND_LEN); 329 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", 330 data->rand.r.y, EAP_PAX_RAND_LEN); 331 pos += EAP_PAX_RAND_LEN; 332 left -= EAP_PAX_RAND_LEN; 333 334 if (left < 2 || (size_t) 2 + WPA_GET_BE16(pos) > left) { 335 wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (CID)"); 336 return; 337 } 338 cid_len = WPA_GET_BE16(pos); 339 if (cid_len > 1500) { 340 wpa_printf(MSG_INFO, "EAP-PAX: Too long CID"); 341 return; 342 } 343 data->cid_len = cid_len; 344 os_free(data->cid); 345 data->cid = os_memdup(pos + 2, data->cid_len); 346 if (data->cid == NULL) { 347 wpa_printf(MSG_INFO, "EAP-PAX: Failed to allocate memory for " 348 "CID"); 349 return; 350 } 351 pos += 2 + data->cid_len; 352 left -= 2 + data->cid_len; 353 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", 354 (u8 *) data->cid, data->cid_len); 355 356 if (left < 2 + EAP_PAX_MAC_LEN || 357 WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) { 358 wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (MAC_CK)"); 359 return; 360 } 361 pos += 2; 362 left -= 2; 363 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", 364 pos, EAP_PAX_MAC_LEN); 365 366 if (eap_user_get(sm, (u8 *) data->cid, data->cid_len, 0) < 0) { 367 wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: unknown CID", 368 (u8 *) data->cid, data->cid_len); 369 data->state = FAILURE; 370 return; 371 } 372 373 for (i = 0; 374 i < EAP_MAX_METHODS && 375 (sm->user->methods[i].vendor != EAP_VENDOR_IETF || 376 sm->user->methods[i].method != EAP_TYPE_NONE); 377 i++) { 378 if (sm->user->methods[i].vendor == EAP_VENDOR_IETF && 379 sm->user->methods[i].method == EAP_TYPE_PAX) 380 break; 381 } 382 383 if (i >= EAP_MAX_METHODS || 384 sm->user->methods[i].vendor != EAP_VENDOR_IETF || 385 sm->user->methods[i].method != EAP_TYPE_PAX) { 386 wpa_hexdump_ascii(MSG_DEBUG, 387 "EAP-PAX: EAP-PAX not enabled for CID", 388 (u8 *) data->cid, data->cid_len); 389 data->state = FAILURE; 390 return; 391 } 392 393 if (sm->user->password == NULL || 394 sm->user->password_len != EAP_PAX_AK_LEN) { 395 wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: invalid password in " 396 "user database for CID", 397 (u8 *) data->cid, data->cid_len); 398 data->state = FAILURE; 399 return; 400 } 401 os_memcpy(data->ak, sm->user->password, EAP_PAX_AK_LEN); 402 403 if (eap_pax_initial_key_derivation(data->mac_id, data->ak, 404 data->rand.e, data->mk, data->ck, 405 data->ick, data->mid) < 0) { 406 wpa_printf(MSG_INFO, "EAP-PAX: Failed to complete initial " 407 "key derivation"); 408 data->state = FAILURE; 409 return; 410 } 411 data->keys_set = 1; 412 413 if (eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, 414 data->rand.r.x, EAP_PAX_RAND_LEN, 415 data->rand.r.y, EAP_PAX_RAND_LEN, 416 (u8 *) data->cid, data->cid_len, mac) < 0 || 417 os_memcmp_const(mac, pos, EAP_PAX_MAC_LEN) != 0) { 418 wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(A, B, CID) in " 419 "PAX_STD-2"); 420 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected MAC_CK(A, B, CID)", 421 mac, EAP_PAX_MAC_LEN); 422 data->state = FAILURE; 423 return; 424 } 425 426 pos += EAP_PAX_MAC_LEN; 427 left -= EAP_PAX_MAC_LEN; 428 429 if (left < EAP_PAX_ICV_LEN) { 430 wpa_printf(MSG_INFO, "EAP-PAX: Too short ICV (%lu) in " 431 "PAX_STD-2", (unsigned long) left); 432 return; 433 } 434 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); 435 if (eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, 436 wpabuf_head(respData), 437 wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, 438 NULL, 0, icvbuf) < 0 || 439 os_memcmp_const(icvbuf, pos, EAP_PAX_ICV_LEN) != 0) { 440 wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV in PAX_STD-2"); 441 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", 442 icvbuf, EAP_PAX_ICV_LEN); 443 return; 444 } 445 pos += EAP_PAX_ICV_LEN; 446 left -= EAP_PAX_ICV_LEN; 447 448 if (left > 0) { 449 wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", 450 pos, left); 451 } 452 453 data->state = PAX_STD_3; 454 } 455 456 457 static void eap_pax_process_ack(struct eap_sm *sm, 458 struct eap_pax_data *data, 459 struct wpabuf *respData) 460 { 461 if (data->state != PAX_STD_3) 462 return; 463 464 wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX-ACK - authentication " 465 "completed successfully"); 466 data->state = SUCCESS; 467 } 468 469 470 static void eap_pax_process(struct eap_sm *sm, void *priv, 471 struct wpabuf *respData) 472 { 473 struct eap_pax_data *data = priv; 474 struct eap_pax_hdr *resp; 475 const u8 *pos; 476 size_t len; 477 478 if (sm->user == NULL || sm->user->password == NULL) { 479 wpa_printf(MSG_INFO, "EAP-PAX: Plaintext password not " 480 "configured"); 481 data->state = FAILURE; 482 return; 483 } 484 485 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); 486 if (pos == NULL || len < sizeof(*resp)) 487 return; 488 489 resp = (struct eap_pax_hdr *) pos; 490 491 switch (resp->op_code) { 492 case EAP_PAX_OP_STD_2: 493 eap_pax_process_std_2(sm, data, respData); 494 break; 495 case EAP_PAX_OP_ACK: 496 eap_pax_process_ack(sm, data, respData); 497 break; 498 } 499 } 500 501 502 static Boolean eap_pax_isDone(struct eap_sm *sm, void *priv) 503 { 504 struct eap_pax_data *data = priv; 505 return data->state == SUCCESS || data->state == FAILURE; 506 } 507 508 509 static u8 * eap_pax_getKey(struct eap_sm *sm, void *priv, size_t *len) 510 { 511 struct eap_pax_data *data = priv; 512 u8 *key; 513 514 if (data->state != SUCCESS) 515 return NULL; 516 517 key = os_malloc(EAP_MSK_LEN); 518 if (key == NULL) 519 return NULL; 520 521 *len = EAP_MSK_LEN; 522 eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN, 523 "Master Session Key", data->rand.e, 2 * EAP_PAX_RAND_LEN, 524 EAP_MSK_LEN, key); 525 526 return key; 527 } 528 529 530 static u8 * eap_pax_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 531 { 532 struct eap_pax_data *data = priv; 533 u8 *key; 534 535 if (data->state != SUCCESS) 536 return NULL; 537 538 key = os_malloc(EAP_EMSK_LEN); 539 if (key == NULL) 540 return NULL; 541 542 *len = EAP_EMSK_LEN; 543 eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN, 544 "Extended Master Session Key", 545 data->rand.e, 2 * EAP_PAX_RAND_LEN, 546 EAP_EMSK_LEN, key); 547 548 return key; 549 } 550 551 552 static Boolean eap_pax_isSuccess(struct eap_sm *sm, void *priv) 553 { 554 struct eap_pax_data *data = priv; 555 return data->state == SUCCESS; 556 } 557 558 559 static u8 * eap_pax_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 560 { 561 struct eap_pax_data *data = priv; 562 u8 *sid; 563 564 if (data->state != SUCCESS) 565 return NULL; 566 567 sid = os_malloc(1 + EAP_PAX_MID_LEN); 568 if (sid == NULL) 569 return NULL; 570 571 *len = 1 + EAP_PAX_MID_LEN; 572 sid[0] = EAP_TYPE_PAX; 573 os_memcpy(sid + 1, data->mid, EAP_PAX_MID_LEN); 574 575 return sid; 576 } 577 578 579 int eap_server_pax_register(void) 580 { 581 struct eap_method *eap; 582 583 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 584 EAP_VENDOR_IETF, EAP_TYPE_PAX, "PAX"); 585 if (eap == NULL) 586 return -1; 587 588 eap->init = eap_pax_init; 589 eap->reset = eap_pax_reset; 590 eap->buildReq = eap_pax_buildReq; 591 eap->check = eap_pax_check; 592 eap->process = eap_pax_process; 593 eap->isDone = eap_pax_isDone; 594 eap->getKey = eap_pax_getKey; 595 eap->isSuccess = eap_pax_isSuccess; 596 eap->get_emsk = eap_pax_get_emsk; 597 eap->getSessionId = eap_pax_get_session_id; 598 599 return eap_server_method_register(eap); 600 } 601