contrib/hostapd/src/eap_server/eap_server_gpsk.c

   1 /*
   2  * hostapd / EAP-GPSK (RFC 5433) server
   3  * Copyright (c) 2006-2007, 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_gpsk_common.h"
  15
  16
  17 struct eap_gpsk_data {
  18         enum { GPSK_1, GPSK_3, SUCCESS, FAILURE } state;
  19         u8 rand_server[EAP_GPSK_RAND_LEN];
  20         u8 rand_peer[EAP_GPSK_RAND_LEN];
  21         u8 msk[EAP_MSK_LEN];
  22         u8 emsk[EAP_EMSK_LEN];
  23         u8 sk[EAP_GPSK_MAX_SK_LEN];
  24         size_t sk_len;
  25         u8 pk[EAP_GPSK_MAX_PK_LEN];
  26         size_t pk_len;
  27         u8 *id_peer;
  28         size_t id_peer_len;
  29 #define MAX_NUM_CSUITES 2
  30         struct eap_gpsk_csuite csuite_list[MAX_NUM_CSUITES];
  31         size_t csuite_count;
  32         int vendor; /* CSuite/Vendor */
  33         int specifier; /* CSuite/Specifier */
  34 };
  35
  36
  37 static const char * eap_gpsk_state_txt(int state)
  38 {
  39         switch (state) {
  40         case GPSK_1:
  41                 return "GPSK-1";
  42         case GPSK_3:
  43                 return "GPSK-3";
  44         case SUCCESS:
  45                 return "SUCCESS";
  46         case FAILURE:
  47                 return "FAILURE";
  48         default:
  49                 return "?";
  50         }
  51 }
  52
  53
  54 static void eap_gpsk_state(struct eap_gpsk_data *data, int state)
  55 {
  56         wpa_printf(MSG_DEBUG, "EAP-GPSK: %s -> %s",
  57                    eap_gpsk_state_txt(data->state),
  58                    eap_gpsk_state_txt(state));
  59         data->state = state;
  60 }
  61
  62
  63 static void * eap_gpsk_init(struct eap_sm *sm)
  64 {
  65         struct eap_gpsk_data *data;
  66
  67         data = os_zalloc(sizeof(*data));
  68         if (data == NULL)
  69                 return NULL;
  70         data->state = GPSK_1;
  71
  72         data->csuite_count = 0;
  73         if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
  74                                            EAP_GPSK_CIPHER_AES)) {
  75                 WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
  76                              EAP_GPSK_VENDOR_IETF);
  77                 WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
  78                              EAP_GPSK_CIPHER_AES);
  79                 data->csuite_count++;
  80         }
  81         if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
  82                                            EAP_GPSK_CIPHER_SHA256)) {
  83                 WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
  84                              EAP_GPSK_VENDOR_IETF);
  85                 WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
  86                              EAP_GPSK_CIPHER_SHA256);
  87                 data->csuite_count++;
  88         }
  89
  90         return data;
  91 }
  92
  93
  94 static void eap_gpsk_reset(struct eap_sm *sm, void *priv)
  95 {
  96         struct eap_gpsk_data *data = priv;
  97         os_free(data->id_peer);
  98         os_free(data);
  99 }
 100
 101
 102 static struct wpabuf * eap_gpsk_build_gpsk_1(struct eap_sm *sm,
 103                                              struct eap_gpsk_data *data, u8 id)
 104 {
 105         size_t len;
 106         struct wpabuf *req;
 107
 108         wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-1");
 109
 110         if (random_get_bytes(data->rand_server, EAP_GPSK_RAND_LEN)) {
 111                 wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to get random data");
 112                 eap_gpsk_state(data, FAILURE);
 113                 return NULL;
 114         }
 115         wpa_hexdump(MSG_MSGDUMP, "EAP-GPSK: RAND_Server",
 116                     data->rand_server, EAP_GPSK_RAND_LEN);
 117
 118         len = 1 + 2 + sm->server_id_len + EAP_GPSK_RAND_LEN + 2 +
 119                 data->csuite_count * sizeof(struct eap_gpsk_csuite);
 120         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
 121                             EAP_CODE_REQUEST, id);
 122         if (req == NULL) {
 123                 wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
 124                            "for request/GPSK-1");
 125                 eap_gpsk_state(data, FAILURE);
 126                 return NULL;
 127         }
 128
 129         wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_1);
 130         wpabuf_put_be16(req, sm->server_id_len);
 131         wpabuf_put_data(req, sm->server_id, sm->server_id_len);
 132         wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
 133         wpabuf_put_be16(req,
 134                         data->csuite_count * sizeof(struct eap_gpsk_csuite));
 135         wpabuf_put_data(req, data->csuite_list,
 136                         data->csuite_count * sizeof(struct eap_gpsk_csuite));
 137
 138         return req;
 139 }
 140
 141
 142 static struct wpabuf * eap_gpsk_build_gpsk_3(struct eap_sm *sm,
 143                                              struct eap_gpsk_data *data, u8 id)
 144 {
 145         u8 *pos, *start;
 146         size_t len, miclen;
 147         struct eap_gpsk_csuite *csuite;
 148         struct wpabuf *req;
 149
 150         wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-3");
 151
 152         miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
 153         len = 1 + 2 * EAP_GPSK_RAND_LEN + 2 + sm->server_id_len +
 154                 sizeof(struct eap_gpsk_csuite) + 2 + miclen;
 155         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
 156                             EAP_CODE_REQUEST, id);
 157         if (req == NULL) {
 158                 wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
 159                            "for request/GPSK-3");
 160                 eap_gpsk_state(data, FAILURE);
 161                 return NULL;
 162         }
 163
 164         wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_3);
 165         start = wpabuf_put(req, 0);
 166
 167         wpabuf_put_data(req, data->rand_peer, EAP_GPSK_RAND_LEN);
 168         wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
 169         wpabuf_put_be16(req, sm->server_id_len);
 170         wpabuf_put_data(req, sm->server_id, sm->server_id_len);
 171         csuite = wpabuf_put(req, sizeof(*csuite));
 172         WPA_PUT_BE32(csuite->vendor, data->vendor);
 173         WPA_PUT_BE16(csuite->specifier, data->specifier);
 174
 175         /* no PD_Payload_2 */
 176         wpabuf_put_be16(req, 0);
 177
 178         pos = wpabuf_put(req, miclen);
 179         if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
 180                                  data->specifier, start, pos - start, pos) < 0)
 181         {
 182                 os_free(req);
 183                 eap_gpsk_state(data, FAILURE);
 184                 return NULL;
 185         }
 186
 187         return req;
 188 }
 189
 190
 191 static struct wpabuf * eap_gpsk_buildReq(struct eap_sm *sm, void *priv, u8 id)
 192 {
 193         struct eap_gpsk_data *data = priv;
 194
 195         switch (data->state) {
 196         case GPSK_1:
 197                 return eap_gpsk_build_gpsk_1(sm, data, id);
 198         case GPSK_3:
 199                 return eap_gpsk_build_gpsk_3(sm, data, id);
 200         default:
 201                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Unknown state %d in buildReq",
 202                            data->state);
 203                 break;
 204         }
 205         return NULL;
 206 }
 207
 208
 209 static Boolean eap_gpsk_check(struct eap_sm *sm, void *priv,
 210                               struct wpabuf *respData)
 211 {
 212         struct eap_gpsk_data *data = priv;
 213         const u8 *pos;
 214         size_t len;
 215
 216         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
 217         if (pos == NULL || len < 1) {
 218                 wpa_printf(MSG_INFO, "EAP-GPSK: Invalid frame");
 219                 return TRUE;
 220         }
 221
 222         wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode=%d", *pos);
 223
 224         if (data->state == GPSK_1 && *pos == EAP_GPSK_OPCODE_GPSK_2)
 225                 return FALSE;
 226
 227         if (data->state == GPSK_3 && *pos == EAP_GPSK_OPCODE_GPSK_4)
 228                 return FALSE;
 229
 230         wpa_printf(MSG_INFO, "EAP-GPSK: Unexpected opcode=%d in state=%d",
 231                    *pos, data->state);
 232
 233         return TRUE;
 234 }
 235
 236
 237 static void eap_gpsk_process_gpsk_2(struct eap_sm *sm,
 238                                     struct eap_gpsk_data *data,
 239                                     const u8 *payload, size_t payloadlen)
 240 {
 241         const u8 *pos, *end;
 242         u16 alen;
 243         const struct eap_gpsk_csuite *csuite;
 244         size_t i, miclen;
 245         u8 mic[EAP_GPSK_MAX_MIC_LEN];
 246
 247         if (data->state != GPSK_1)
 248                 return;
 249
 250         wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-2");
 251
 252         pos = payload;
 253         end = payload + payloadlen;
 254
 255         if (end - pos < 2) {
 256                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 257                            "ID_Peer length");
 258                 eap_gpsk_state(data, FAILURE);
 259                 return;
 260         }
 261         alen = WPA_GET_BE16(pos);
 262         pos += 2;
 263         if (end - pos < alen) {
 264                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 265                            "ID_Peer");
 266                 eap_gpsk_state(data, FAILURE);
 267                 return;
 268         }
 269         os_free(data->id_peer);
 270         data->id_peer = os_malloc(alen);
 271         if (data->id_peer == NULL) {
 272                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Not enough memory to store "
 273                            "%d-octet ID_Peer", alen);
 274                 return;
 275         }
 276         os_memcpy(data->id_peer, pos, alen);
 277         data->id_peer_len = alen;
 278         wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Peer",
 279                           data->id_peer, data->id_peer_len);
 280         pos += alen;
 281
 282         if (end - pos < 2) {
 283                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 284                            "ID_Server length");
 285                 eap_gpsk_state(data, FAILURE);
 286                 return;
 287         }
 288         alen = WPA_GET_BE16(pos);
 289         pos += 2;
 290         if (end - pos < alen) {
 291                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 292                            "ID_Server");
 293                 eap_gpsk_state(data, FAILURE);
 294                 return;
 295         }
 296         if (alen != sm->server_id_len ||
 297             os_memcmp(pos, sm->server_id, alen) != 0) {
 298                 wpa_printf(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1 and "
 299                            "GPSK-2 did not match");
 300                 eap_gpsk_state(data, FAILURE);
 301                 return;
 302         }
 303         pos += alen;
 304
 305         if (end - pos < EAP_GPSK_RAND_LEN) {
 306                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 307                            "RAND_Peer");
 308                 eap_gpsk_state(data, FAILURE);
 309                 return;
 310         }
 311         os_memcpy(data->rand_peer, pos, EAP_GPSK_RAND_LEN);
 312         wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer",
 313                     data->rand_peer, EAP_GPSK_RAND_LEN);
 314         pos += EAP_GPSK_RAND_LEN;
 315
 316         if (end - pos < EAP_GPSK_RAND_LEN) {
 317                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 318                            "RAND_Server");
 319                 eap_gpsk_state(data, FAILURE);
 320                 return;
 321         }
 322         if (os_memcmp(data->rand_server, pos, EAP_GPSK_RAND_LEN) != 0) {
 323                 wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
 324                            "GPSK-2 did not match");
 325                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
 326                             data->rand_server, EAP_GPSK_RAND_LEN);
 327                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-2",
 328                             pos, EAP_GPSK_RAND_LEN);
 329                 eap_gpsk_state(data, FAILURE);
 330                 return;
 331         }
 332         pos += EAP_GPSK_RAND_LEN;
 333
 334         if (end - pos < 2) {
 335                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 336                            "CSuite_List length");
 337                 eap_gpsk_state(data, FAILURE);
 338                 return;
 339         }
 340         alen = WPA_GET_BE16(pos);
 341         pos += 2;
 342         if (end - pos < alen) {
 343                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 344                            "CSuite_List");
 345                 eap_gpsk_state(data, FAILURE);
 346                 return;
 347         }
 348         if (alen != data->csuite_count * sizeof(struct eap_gpsk_csuite) ||
 349             os_memcmp(pos, data->csuite_list, alen) != 0) {
 350                 wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List in GPSK-1 and "
 351                            "GPSK-2 did not match");
 352                 eap_gpsk_state(data, FAILURE);
 353                 return;
 354         }
 355         pos += alen;
 356
 357         if (end - pos < (int) sizeof(*csuite)) {
 358                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 359                            "CSuite_Sel");
 360                 eap_gpsk_state(data, FAILURE);
 361                 return;
 362         }
 363         csuite = (const struct eap_gpsk_csuite *) pos;
 364         for (i = 0; i < data->csuite_count; i++) {
 365                 if (os_memcmp(csuite, &data->csuite_list[i], sizeof(*csuite))
 366                     == 0)
 367                         break;
 368         }
 369         if (i == data->csuite_count) {
 370                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Peer selected unsupported "
 371                            "ciphersuite %d:%d",
 372                            WPA_GET_BE32(csuite->vendor),
 373                            WPA_GET_BE16(csuite->specifier));
 374                 eap_gpsk_state(data, FAILURE);
 375                 return;
 376         }
 377         data->vendor = WPA_GET_BE32(csuite->vendor);
 378         data->specifier = WPA_GET_BE16(csuite->specifier);
 379         wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel %d:%d",
 380                    data->vendor, data->specifier);
 381         pos += sizeof(*csuite);
 382
 383         if (end - pos < 2) {
 384                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 385                            "PD_Payload_1 length");
 386                 eap_gpsk_state(data, FAILURE);
 387                 return;
 388         }
 389         alen = WPA_GET_BE16(pos);
 390         pos += 2;
 391         if (end - pos < alen) {
 392                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 393                            "PD_Payload_1");
 394                 eap_gpsk_state(data, FAILURE);
 395                 return;
 396         }
 397         wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
 398         pos += alen;
 399
 400         if (sm->user == NULL || sm->user->password == NULL) {
 401                 wpa_printf(MSG_INFO, "EAP-GPSK: No PSK/password configured "
 402                            "for the user");
 403                 eap_gpsk_state(data, FAILURE);
 404                 return;
 405         }
 406
 407         if (eap_gpsk_derive_keys(sm->user->password, sm->user->password_len,
 408                                  data->vendor, data->specifier,
 409                                  data->rand_peer, data->rand_server,
 410                                  data->id_peer, data->id_peer_len,
 411                                  sm->server_id, sm->server_id_len,
 412                                  data->msk, data->emsk,
 413                                  data->sk, &data->sk_len,
 414                                  data->pk, &data->pk_len) < 0) {
 415                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive keys");
 416                 eap_gpsk_state(data, FAILURE);
 417                 return;
 418         }
 419
 420         miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
 421         if (end - pos < (int) miclen) {
 422                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
 423                            "(left=%lu miclen=%lu)",
 424                            (unsigned long) (end - pos),
 425                            (unsigned long) miclen);
 426                 eap_gpsk_state(data, FAILURE);
 427                 return;
 428         }
 429         if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
 430                                  data->specifier, payload, pos - payload, mic)
 431             < 0) {
 432                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
 433                 eap_gpsk_state(data, FAILURE);
 434                 return;
 435         }
 436         if (os_memcmp(mic, pos, miclen) != 0) {
 437                 wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-2");
 438                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
 439                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
 440                 eap_gpsk_state(data, FAILURE);
 441                 return;
 442         }
 443         pos += miclen;
 444
 445         if (pos != end) {
 446                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
 447                            "data in the end of GPSK-2",
 448                            (unsigned long) (end - pos));
 449         }
 450
 451         eap_gpsk_state(data, GPSK_3);
 452 }
 453
 454
 455 static void eap_gpsk_process_gpsk_4(struct eap_sm *sm,
 456                                     struct eap_gpsk_data *data,
 457                                     const u8 *payload, size_t payloadlen)
 458 {
 459         const u8 *pos, *end;
 460         u16 alen;
 461         size_t miclen;
 462         u8 mic[EAP_GPSK_MAX_MIC_LEN];
 463
 464         if (data->state != GPSK_3)
 465                 return;
 466
 467         wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-4");
 468
 469         pos = payload;
 470         end = payload + payloadlen;
 471
 472         if (end - pos < 2) {
 473                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 474                            "PD_Payload_1 length");
 475                 eap_gpsk_state(data, FAILURE);
 476                 return;
 477         }
 478         alen = WPA_GET_BE16(pos);
 479         pos += 2;
 480         if (end - pos < alen) {
 481                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
 482                            "PD_Payload_1");
 483                 eap_gpsk_state(data, FAILURE);
 484                 return;
 485         }
 486         wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
 487         pos += alen;
 488
 489         miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
 490         if (end - pos < (int) miclen) {
 491                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
 492                            "(left=%lu miclen=%lu)",
 493                            (unsigned long) (end - pos),
 494                            (unsigned long) miclen);
 495                 eap_gpsk_state(data, FAILURE);
 496                 return;
 497         }
 498         if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
 499                                  data->specifier, payload, pos - payload, mic)
 500             < 0) {
 501                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
 502                 eap_gpsk_state(data, FAILURE);
 503                 return;
 504         }
 505         if (os_memcmp(mic, pos, miclen) != 0) {
 506                 wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-4");
 507                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
 508                 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
 509                 eap_gpsk_state(data, FAILURE);
 510                 return;
 511         }
 512         pos += miclen;
 513
 514         if (pos != end) {
 515                 wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
 516                            "data in the end of GPSK-4",
 517                            (unsigned long) (end - pos));
 518         }
 519
 520         eap_gpsk_state(data, SUCCESS);
 521 }
 522
 523
 524 static void eap_gpsk_process(struct eap_sm *sm, void *priv,
 525                              struct wpabuf *respData)
 526 {
 527         struct eap_gpsk_data *data = priv;
 528         const u8 *pos;
 529         size_t len;
 530
 531         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
 532         if (pos == NULL || len < 1)
 533                 return;
 534
 535         switch (*pos) {
 536         case EAP_GPSK_OPCODE_GPSK_2:
 537                 eap_gpsk_process_gpsk_2(sm, data, pos + 1, len - 1);
 538                 break;
 539         case EAP_GPSK_OPCODE_GPSK_4:
 540                 eap_gpsk_process_gpsk_4(sm, data, pos + 1, len - 1);
 541                 break;
 542         }
 543 }
 544
 545
 546 static Boolean eap_gpsk_isDone(struct eap_sm *sm, void *priv)
 547 {
 548         struct eap_gpsk_data *data = priv;
 549         return data->state == SUCCESS || data->state == FAILURE;
 550 }
 551
 552
 553 static u8 * eap_gpsk_getKey(struct eap_sm *sm, void *priv, size_t *len)
 554 {
 555         struct eap_gpsk_data *data = priv;
 556         u8 *key;
 557
 558         if (data->state != SUCCESS)
 559                 return NULL;
 560
 561         key = os_malloc(EAP_MSK_LEN);
 562         if (key == NULL)
 563                 return NULL;
 564         os_memcpy(key, data->msk, EAP_MSK_LEN);
 565         *len = EAP_MSK_LEN;
 566
 567         return key;
 568 }
 569
 570
 571 static u8 * eap_gpsk_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
 572 {
 573         struct eap_gpsk_data *data = priv;
 574         u8 *key;
 575
 576         if (data->state != SUCCESS)
 577                 return NULL;
 578
 579         key = os_malloc(EAP_EMSK_LEN);
 580         if (key == NULL)
 581                 return NULL;
 582         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
 583         *len = EAP_EMSK_LEN;
 584
 585         return key;
 586 }
 587
 588
 589 static Boolean eap_gpsk_isSuccess(struct eap_sm *sm, void *priv)
 590 {
 591         struct eap_gpsk_data *data = priv;
 592         return data->state == SUCCESS;
 593 }
 594
 595
 596 int eap_server_gpsk_register(void)
 597 {
 598         struct eap_method *eap;
 599         int ret;
 600
 601         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
 602                                       EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
 603         if (eap == NULL)
 604                 return -1;
 605
 606         eap->init = eap_gpsk_init;
 607         eap->reset = eap_gpsk_reset;
 608         eap->buildReq = eap_gpsk_buildReq;
 609         eap->check = eap_gpsk_check;
 610         eap->process = eap_gpsk_process;
 611         eap->isDone = eap_gpsk_isDone;
 612         eap->getKey = eap_gpsk_getKey;
 613         eap->isSuccess = eap_gpsk_isSuccess;
 614         eap->get_emsk = eap_gpsk_get_emsk;
 615
 616         ret = eap_server_method_register(eap);
 617         if (ret)
 618                 eap_server_method_free(eap);
 619         return ret;
 620 }