contrib/hostapd/src/eap_server/eap_server_pax.c

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