1 /* 2 * EAP peer method: EAP-SIM (RFC 4186) 3 * Copyright (c) 2004-2012, Jouni Malinen <j (at) 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 "pcsc_funcs.h" 13 #include "crypto/milenage.h" 14 #include "crypto/random.h" 15 #include "eap_peer/eap_i.h" 16 #include "eap_config.h" 17 #include "eap_common/eap_sim_common.h" 18 19 20 struct eap_sim_data { 21 u8 *ver_list; 22 size_t ver_list_len; 23 int selected_version; 24 size_t min_num_chal, num_chal; 25 26 u8 kc[3][EAP_SIM_KC_LEN]; 27 u8 sres[3][EAP_SIM_SRES_LEN]; 28 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN]; 29 u8 mk[EAP_SIM_MK_LEN]; 30 u8 k_aut[EAP_SIM_K_AUT_LEN]; 31 u8 k_encr[EAP_SIM_K_ENCR_LEN]; 32 u8 msk[EAP_SIM_KEYING_DATA_LEN]; 33 u8 emsk[EAP_EMSK_LEN]; 34 u8 rand[3][GSM_RAND_LEN]; 35 36 int num_id_req, num_notification; 37 u8 *pseudonym; 38 size_t pseudonym_len; 39 u8 *reauth_id; 40 size_t reauth_id_len; 41 int reauth; 42 unsigned int counter, counter_too_small; 43 u8 *last_eap_identity; 44 size_t last_eap_identity_len; 45 enum { 46 CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE 47 } state; 48 int result_ind, use_result_ind; 49 int use_pseudonym; 50 }; 51 52 53 #ifndef CONFIG_NO_STDOUT_DEBUG 54 static const char * eap_sim_state_txt(int state) 55 { 56 switch (state) { 57 case CONTINUE: 58 return "CONTINUE"; 59 case RESULT_SUCCESS: 60 return "RESULT_SUCCESS"; 61 case SUCCESS: 62 return "SUCCESS"; 63 case FAILURE: 64 return "FAILURE"; 65 default: 66 return "?"; 67 } 68 } 69 #endif /* CONFIG_NO_STDOUT_DEBUG */ 70 71 72 static void eap_sim_state(struct eap_sim_data *data, int state) 73 { 74 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s", 75 eap_sim_state_txt(data->state), 76 eap_sim_state_txt(state)); 77 data->state = state; 78 } 79 80 81 static void * eap_sim_init(struct eap_sm *sm) 82 { 83 struct eap_sim_data *data; 84 struct eap_peer_config *config = eap_get_config(sm); 85 86 data = os_zalloc(sizeof(*data)); 87 if (data == NULL) 88 return NULL; 89 90 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) { 91 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data " 92 "for NONCE_MT"); 93 os_free(data); 94 return NULL; 95 } 96 97 data->min_num_chal = 2; 98 if (config && config->phase1) { 99 char *pos = os_strstr(config->phase1, "sim_min_num_chal="); 100 if (pos) { 101 data->min_num_chal = atoi(pos + 17); 102 if (data->min_num_chal < 2 || data->min_num_chal > 3) { 103 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid " 104 "sim_min_num_chal configuration " 105 "(%lu, expected 2 or 3)", 106 (unsigned long) data->min_num_chal); 107 os_free(data); 108 return NULL; 109 } 110 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of " 111 "challenges to %lu", 112 (unsigned long) data->min_num_chal); 113 } 114 115 data->result_ind = os_strstr(config->phase1, "result_ind=1") != 116 NULL; 117 } 118 119 data->use_pseudonym = !sm->init_phase2; 120 if (config && config->anonymous_identity && data->use_pseudonym) { 121 data->pseudonym = os_malloc(config->anonymous_identity_len); 122 if (data->pseudonym) { 123 os_memcpy(data->pseudonym, config->anonymous_identity, 124 config->anonymous_identity_len); 125 data->pseudonym_len = config->anonymous_identity_len; 126 } 127 } 128 129 eap_sim_state(data, CONTINUE); 130 131 return data; 132 } 133 134 135 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth) 136 { 137 if (!reauth) { 138 os_memset(data->mk, 0, EAP_SIM_MK_LEN); 139 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN); 140 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN); 141 } 142 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN); 143 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN); 144 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN); 145 os_memset(data->emsk, 0, EAP_EMSK_LEN); 146 } 147 148 149 static void eap_sim_deinit(struct eap_sm *sm, void *priv) 150 { 151 struct eap_sim_data *data = priv; 152 if (data) { 153 os_free(data->ver_list); 154 os_free(data->pseudonym); 155 os_free(data->reauth_id); 156 os_free(data->last_eap_identity); 157 eap_sim_clear_keys(data, 0); 158 os_free(data); 159 } 160 } 161 162 163 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data) 164 { 165 char req[200], *pos, *end; 166 size_t i; 167 168 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing"); 169 pos = req; 170 end = pos + sizeof(req); 171 pos += os_snprintf(pos, end - pos, "GSM-AUTH"); 172 for (i = 0; i < data->num_chal; i++) { 173 pos += os_snprintf(pos, end - pos, ":"); 174 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i], 175 GSM_RAND_LEN); 176 } 177 178 eap_sm_request_sim(sm, req); 179 return 1; 180 } 181 182 183 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data, 184 struct eap_peer_config *conf) 185 { 186 char *resp, *pos; 187 size_t i; 188 189 wpa_printf(MSG_DEBUG, 190 "EAP-SIM: Use result from external SIM processing"); 191 192 resp = conf->external_sim_resp; 193 conf->external_sim_resp = NULL; 194 195 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) { 196 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response"); 197 os_free(resp); 198 return -1; 199 } 200 201 pos = resp + 9; 202 for (i = 0; i < data->num_chal; i++) { 203 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND", 204 data->rand[i], GSM_RAND_LEN); 205 206 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0) 207 goto invalid; 208 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc", 209 data->kc[i], EAP_SIM_KC_LEN); 210 pos += EAP_SIM_KC_LEN * 2; 211 if (*pos != ':') 212 goto invalid; 213 pos++; 214 215 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0) 216 goto invalid; 217 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES", 218 data->sres[i], EAP_SIM_SRES_LEN); 219 pos += EAP_SIM_SRES_LEN * 2; 220 if (i + 1 < data->num_chal) { 221 if (*pos != ':') 222 goto invalid; 223 pos++; 224 } 225 } 226 227 os_free(resp); 228 return 0; 229 230 invalid: 231 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response"); 232 os_free(resp); 233 return -1; 234 } 235 236 237 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data) 238 { 239 struct eap_peer_config *conf; 240 241 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm"); 242 243 conf = eap_get_config(sm); 244 if (conf == NULL) 245 return -1; 246 247 if (sm->external_sim) { 248 if (conf->external_sim_resp) 249 return eap_sim_ext_sim_result(sm, data, conf); 250 else 251 return eap_sim_ext_sim_req(sm, data); 252 } 253 254 #ifdef PCSC_FUNCS 255 if (conf->pcsc) { 256 if (scard_gsm_auth(sm->scard_ctx, data->rand[0], 257 data->sres[0], data->kc[0]) || 258 scard_gsm_auth(sm->scard_ctx, data->rand[1], 259 data->sres[1], data->kc[1]) || 260 (data->num_chal > 2 && 261 scard_gsm_auth(sm->scard_ctx, data->rand[2], 262 data->sres[2], data->kc[2]))) { 263 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM " 264 "authentication could not be completed"); 265 return -1; 266 } 267 return 0; 268 } 269 #endif /* PCSC_FUNCS */ 270 271 #ifdef CONFIG_SIM_SIMULATOR 272 if (conf->password) { 273 u8 opc[16], k[16]; 274 const char *pos; 275 size_t i; 276 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage " 277 "implementation for authentication"); 278 if (conf->password_len < 65) { 279 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage " 280 "password"); 281 return -1; 282 } 283 pos = (const char *) conf->password; 284 if (hexstr2bin(pos, k, 16)) 285 return -1; 286 pos += 32; 287 if (*pos != ':') 288 return -1; 289 pos++; 290 291 if (hexstr2bin(pos, opc, 16)) 292 return -1; 293 294 for (i = 0; i < data->num_chal; i++) { 295 if (gsm_milenage(opc, k, data->rand[i], 296 data->sres[i], data->kc[i])) { 297 wpa_printf(MSG_DEBUG, "EAP-SIM: " 298 "GSM-Milenage authentication " 299 "could not be completed"); 300 return -1; 301 } 302 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND", 303 data->rand[i], GSM_RAND_LEN); 304 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES", 305 data->sres[i], EAP_SIM_SRES_LEN); 306 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc", 307 data->kc[i], EAP_SIM_KC_LEN); 308 } 309 return 0; 310 } 311 #endif /* CONFIG_SIM_SIMULATOR */ 312 313 #ifdef CONFIG_SIM_HARDCODED 314 /* These hardcoded Kc and SRES values are used for testing. RAND to 315 * KC/SREC mapping is very bogus as far as real authentication is 316 * concerned, but it is quite useful for cases where the AS is rotating 317 * the order of pre-configured values. */ 318 { 319 size_t i; 320 321 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES " 322 "values for testing"); 323 324 for (i = 0; i < data->num_chal; i++) { 325 if (data->rand[i][0] == 0xaa) { 326 os_memcpy(data->kc[i], 327 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7", 328 EAP_SIM_KC_LEN); 329 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4", 330 EAP_SIM_SRES_LEN); 331 } else if (data->rand[i][0] == 0xbb) { 332 os_memcpy(data->kc[i], 333 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7", 334 EAP_SIM_KC_LEN); 335 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4", 336 EAP_SIM_SRES_LEN); 337 } else { 338 os_memcpy(data->kc[i], 339 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7", 340 EAP_SIM_KC_LEN); 341 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4", 342 EAP_SIM_SRES_LEN); 343 } 344 } 345 } 346 347 return 0; 348 349 #else /* CONFIG_SIM_HARDCODED */ 350 351 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm " 352 "enabled"); 353 return -1; 354 355 #endif /* CONFIG_SIM_HARDCODED */ 356 } 357 358 359 static int eap_sim_supported_ver(int version) 360 { 361 return version == EAP_SIM_VERSION; 362 } 363 364 365 #define CLEAR_PSEUDONYM 0x01 366 #define CLEAR_REAUTH_ID 0x02 367 #define CLEAR_EAP_ID 0x04 368 369 static void eap_sim_clear_identities(struct eap_sm *sm, 370 struct eap_sim_data *data, int id) 371 { 372 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) { 373 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym"); 374 os_free(data->pseudonym); 375 data->pseudonym = NULL; 376 data->pseudonym_len = 0; 377 if (data->use_pseudonym) 378 eap_set_anon_id(sm, NULL, 0); 379 } 380 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) { 381 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id"); 382 os_free(data->reauth_id); 383 data->reauth_id = NULL; 384 data->reauth_id_len = 0; 385 } 386 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) { 387 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id"); 388 os_free(data->last_eap_identity); 389 data->last_eap_identity = NULL; 390 data->last_eap_identity_len = 0; 391 } 392 } 393 394 395 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data, 396 struct eap_sim_attrs *attr) 397 { 398 if (attr->next_pseudonym) { 399 const u8 *identity = NULL; 400 size_t identity_len = 0; 401 const u8 *realm = NULL; 402 size_t realm_len = 0; 403 404 wpa_hexdump_ascii(MSG_DEBUG, 405 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM", 406 attr->next_pseudonym, 407 attr->next_pseudonym_len); 408 os_free(data->pseudonym); 409 /* Look for the realm of the permanent identity */ 410 identity = eap_get_config_identity(sm, &identity_len); 411 if (identity) { 412 for (realm = identity, realm_len = identity_len; 413 realm_len > 0; realm_len--, realm++) { 414 if (*realm == '@') 415 break; 416 } 417 } 418 data->pseudonym = os_malloc(attr->next_pseudonym_len + 419 realm_len); 420 if (data->pseudonym == NULL) { 421 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for " 422 "next pseudonym"); 423 data->pseudonym_len = 0; 424 return -1; 425 } 426 os_memcpy(data->pseudonym, attr->next_pseudonym, 427 attr->next_pseudonym_len); 428 if (realm_len) { 429 os_memcpy(data->pseudonym + attr->next_pseudonym_len, 430 realm, realm_len); 431 } 432 data->pseudonym_len = attr->next_pseudonym_len + realm_len; 433 if (data->use_pseudonym) 434 eap_set_anon_id(sm, data->pseudonym, 435 data->pseudonym_len); 436 } 437 438 if (attr->next_reauth_id) { 439 os_free(data->reauth_id); 440 data->reauth_id = os_malloc(attr->next_reauth_id_len); 441 if (data->reauth_id == NULL) { 442 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for " 443 "next reauth_id"); 444 data->reauth_id_len = 0; 445 return -1; 446 } 447 os_memcpy(data->reauth_id, attr->next_reauth_id, 448 attr->next_reauth_id_len); 449 data->reauth_id_len = attr->next_reauth_id_len; 450 wpa_hexdump_ascii(MSG_DEBUG, 451 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID", 452 data->reauth_id, 453 data->reauth_id_len); 454 } 455 456 return 0; 457 } 458 459 460 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id, 461 int err) 462 { 463 struct eap_sim_msg *msg; 464 465 eap_sim_state(data, FAILURE); 466 data->num_id_req = 0; 467 data->num_notification = 0; 468 469 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)", 470 err); 471 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 472 EAP_SIM_SUBTYPE_CLIENT_ERROR); 473 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0); 474 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0); 475 } 476 477 478 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm, 479 struct eap_sim_data *data, u8 id, 480 enum eap_sim_id_req id_req) 481 { 482 const u8 *identity = NULL; 483 size_t identity_len = 0; 484 struct eap_sim_msg *msg; 485 486 data->reauth = 0; 487 if (id_req == ANY_ID && data->reauth_id) { 488 identity = data->reauth_id; 489 identity_len = data->reauth_id_len; 490 data->reauth = 1; 491 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) && 492 data->pseudonym) { 493 identity = data->pseudonym; 494 identity_len = data->pseudonym_len; 495 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID); 496 } else if (id_req != NO_ID_REQ) { 497 identity = eap_get_config_identity(sm, &identity_len); 498 if (identity) { 499 eap_sim_clear_identities(sm, data, CLEAR_PSEUDONYM | 500 CLEAR_REAUTH_ID); 501 } 502 } 503 if (id_req != NO_ID_REQ) 504 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID); 505 506 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id); 507 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, 508 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START); 509 if (!data->reauth) { 510 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT", 511 data->nonce_mt, EAP_SIM_NONCE_MT_LEN); 512 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0, 513 data->nonce_mt, EAP_SIM_NONCE_MT_LEN); 514 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d", 515 data->selected_version); 516 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION, 517 data->selected_version, NULL, 0); 518 } 519 520 if (identity) { 521 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY", 522 identity, identity_len); 523 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len, 524 identity, identity_len); 525 } 526 527 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0); 528 } 529 530 531 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data, 532 u8 id) 533 { 534 struct eap_sim_msg *msg; 535 536 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id); 537 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 538 EAP_SIM_SUBTYPE_CHALLENGE); 539 if (data->use_result_ind) { 540 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 541 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 542 } 543 wpa_printf(MSG_DEBUG, " AT_MAC"); 544 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 545 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, 546 (u8 *) data->sres, 547 data->num_chal * EAP_SIM_SRES_LEN); 548 } 549 550 551 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data, 552 u8 id, int counter_too_small, 553 const u8 *nonce_s) 554 { 555 struct eap_sim_msg *msg; 556 unsigned int counter; 557 558 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)", 559 id); 560 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 561 EAP_SIM_SUBTYPE_REAUTHENTICATION); 562 wpa_printf(MSG_DEBUG, " AT_IV"); 563 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 564 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); 565 566 if (counter_too_small) { 567 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL"); 568 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0); 569 counter = data->counter_too_small; 570 } else 571 counter = data->counter; 572 573 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter); 574 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0); 575 576 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { 577 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt " 578 "AT_ENCR_DATA"); 579 eap_sim_msg_free(msg); 580 return NULL; 581 } 582 if (data->use_result_ind) { 583 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 584 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 585 } 586 wpa_printf(MSG_DEBUG, " AT_MAC"); 587 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 588 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s, 589 EAP_SIM_NONCE_S_LEN); 590 } 591 592 593 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data, 594 u8 id, u16 notification) 595 { 596 struct eap_sim_msg *msg; 597 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL; 598 599 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id); 600 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, 601 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION); 602 if (k_aut && data->reauth) { 603 wpa_printf(MSG_DEBUG, " AT_IV"); 604 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 605 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, 606 EAP_SIM_AT_ENCR_DATA); 607 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter); 608 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter, 609 NULL, 0); 610 if (eap_sim_msg_add_encr_end(msg, data->k_encr, 611 EAP_SIM_AT_PADDING)) { 612 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt " 613 "AT_ENCR_DATA"); 614 eap_sim_msg_free(msg); 615 return NULL; 616 } 617 } 618 if (k_aut) { 619 wpa_printf(MSG_DEBUG, " AT_MAC"); 620 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 621 } 622 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0); 623 } 624 625 626 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm, 627 struct eap_sim_data *data, u8 id, 628 struct eap_sim_attrs *attr) 629 { 630 int selected_version = -1, id_error; 631 size_t i; 632 u8 *pos; 633 634 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start"); 635 if (attr->version_list == NULL) { 636 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in " 637 "SIM/Start"); 638 return eap_sim_client_error(data, id, 639 EAP_SIM_UNSUPPORTED_VERSION); 640 } 641 642 os_free(data->ver_list); 643 data->ver_list = os_malloc(attr->version_list_len); 644 if (data->ver_list == NULL) { 645 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate " 646 "memory for version list"); 647 return eap_sim_client_error(data, id, 648 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 649 } 650 os_memcpy(data->ver_list, attr->version_list, attr->version_list_len); 651 data->ver_list_len = attr->version_list_len; 652 pos = data->ver_list; 653 for (i = 0; i < data->ver_list_len / 2; i++) { 654 int ver = pos[0] * 256 + pos[1]; 655 pos += 2; 656 if (eap_sim_supported_ver(ver)) { 657 selected_version = ver; 658 break; 659 } 660 } 661 if (selected_version < 0) { 662 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported " 663 "version"); 664 return eap_sim_client_error(data, id, 665 EAP_SIM_UNSUPPORTED_VERSION); 666 } 667 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d", 668 selected_version); 669 data->selected_version = selected_version; 670 671 id_error = 0; 672 switch (attr->id_req) { 673 case NO_ID_REQ: 674 break; 675 case ANY_ID: 676 if (data->num_id_req > 0) 677 id_error++; 678 data->num_id_req++; 679 break; 680 case FULLAUTH_ID: 681 if (data->num_id_req > 1) 682 id_error++; 683 data->num_id_req++; 684 break; 685 case PERMANENT_ID: 686 if (data->num_id_req > 2) 687 id_error++; 688 data->num_id_req++; 689 break; 690 } 691 if (id_error) { 692 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests " 693 "used within one authentication"); 694 return eap_sim_client_error(data, id, 695 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 696 } 697 698 return eap_sim_response_start(sm, data, id, attr->id_req); 699 } 700 701 702 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm, 703 struct eap_sim_data *data, 704 u8 id, 705 const struct wpabuf *reqData, 706 struct eap_sim_attrs *attr) 707 { 708 const u8 *identity; 709 size_t identity_len; 710 struct eap_sim_attrs eattr; 711 int res; 712 713 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge"); 714 data->reauth = 0; 715 if (!attr->mac || !attr->rand) { 716 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message " 717 "did not include%s%s", 718 !attr->mac ? " AT_MAC" : "", 719 !attr->rand ? " AT_RAND" : ""); 720 return eap_sim_client_error(data, id, 721 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 722 } 723 724 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges", 725 (unsigned long) attr->num_chal); 726 if (attr->num_chal < data->min_num_chal) { 727 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of " 728 "challenges (%lu)", (unsigned long) attr->num_chal); 729 return eap_sim_client_error(data, id, 730 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL); 731 } 732 if (attr->num_chal > 3) { 733 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges " 734 "(%lu)", (unsigned long) attr->num_chal); 735 return eap_sim_client_error(data, id, 736 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 737 } 738 739 /* Verify that RANDs are different */ 740 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN, 741 GSM_RAND_LEN) == 0 || 742 (attr->num_chal > 2 && 743 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN, 744 GSM_RAND_LEN) == 0 || 745 os_memcmp(attr->rand + GSM_RAND_LEN, 746 attr->rand + 2 * GSM_RAND_LEN, 747 GSM_RAND_LEN) == 0))) { 748 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times"); 749 return eap_sim_client_error(data, id, 750 EAP_SIM_RAND_NOT_FRESH); 751 } 752 753 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN); 754 data->num_chal = attr->num_chal; 755 756 res = eap_sim_gsm_auth(sm, data); 757 if (res > 0) { 758 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing"); 759 return NULL; 760 } 761 if (res) { 762 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed"); 763 return eap_sim_client_error(data, id, 764 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 765 } 766 if (data->last_eap_identity) { 767 identity = data->last_eap_identity; 768 identity_len = data->last_eap_identity_len; 769 } else if (data->pseudonym) { 770 identity = data->pseudonym; 771 identity_len = data->pseudonym_len; 772 } else 773 identity = eap_get_config_identity(sm, &identity_len); 774 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK " 775 "derivation", identity, identity_len); 776 eap_sim_derive_mk(identity, identity_len, data->nonce_mt, 777 data->selected_version, data->ver_list, 778 data->ver_list_len, data->num_chal, 779 (const u8 *) data->kc, data->mk); 780 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk, 781 data->emsk); 782 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt, 783 EAP_SIM_NONCE_MT_LEN)) { 784 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message " 785 "used invalid AT_MAC"); 786 return eap_sim_client_error(data, id, 787 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 788 } 789 790 /* Old reauthentication identity must not be used anymore. In 791 * other words, if no new reauth identity is received, full 792 * authentication will be used on next reauthentication (using 793 * pseudonym identity or permanent identity). */ 794 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 795 796 if (attr->encr_data) { 797 u8 *decrypted; 798 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 799 attr->encr_data_len, attr->iv, 800 &eattr, 0); 801 if (decrypted == NULL) { 802 return eap_sim_client_error( 803 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET); 804 } 805 eap_sim_learn_ids(sm, data, &eattr); 806 os_free(decrypted); 807 } 808 809 if (data->result_ind && attr->result_ind) 810 data->use_result_ind = 1; 811 812 if (data->state != FAILURE) { 813 eap_sim_state(data, data->use_result_ind ? 814 RESULT_SUCCESS : SUCCESS); 815 } 816 817 data->num_id_req = 0; 818 data->num_notification = 0; 819 /* RFC 4186 specifies that counter is initialized to one after 820 * fullauth, but initializing it to zero makes it easier to implement 821 * reauth verification. */ 822 data->counter = 0; 823 return eap_sim_response_challenge(data, id); 824 } 825 826 827 static int eap_sim_process_notification_reauth(struct eap_sim_data *data, 828 struct eap_sim_attrs *attr) 829 { 830 struct eap_sim_attrs eattr; 831 u8 *decrypted; 832 833 if (attr->encr_data == NULL || attr->iv == NULL) { 834 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after " 835 "reauth did not include encrypted data"); 836 return -1; 837 } 838 839 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 840 attr->encr_data_len, attr->iv, &eattr, 841 0); 842 if (decrypted == NULL) { 843 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted " 844 "data from notification message"); 845 return -1; 846 } 847 848 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) { 849 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification " 850 "message does not match with counter in reauth " 851 "message"); 852 os_free(decrypted); 853 return -1; 854 } 855 856 os_free(decrypted); 857 return 0; 858 } 859 860 861 static int eap_sim_process_notification_auth(struct eap_sim_data *data, 862 const struct wpabuf *reqData, 863 struct eap_sim_attrs *attr) 864 { 865 if (attr->mac == NULL) { 866 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth " 867 "Notification message"); 868 return -1; 869 } 870 871 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0)) 872 { 873 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message " 874 "used invalid AT_MAC"); 875 return -1; 876 } 877 878 if (data->reauth && 879 eap_sim_process_notification_reauth(data, attr)) { 880 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification " 881 "message after reauth"); 882 return -1; 883 } 884 885 return 0; 886 } 887 888 889 static struct wpabuf * eap_sim_process_notification( 890 struct eap_sm *sm, struct eap_sim_data *data, u8 id, 891 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 892 { 893 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification"); 894 if (data->num_notification > 0) { 895 wpa_printf(MSG_INFO, "EAP-SIM: too many notification " 896 "rounds (only one allowed)"); 897 return eap_sim_client_error(data, id, 898 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 899 } 900 data->num_notification++; 901 if (attr->notification == -1) { 902 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in " 903 "Notification message"); 904 return eap_sim_client_error(data, id, 905 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 906 } 907 908 if ((attr->notification & 0x4000) == 0 && 909 eap_sim_process_notification_auth(data, reqData, attr)) { 910 return eap_sim_client_error(data, id, 911 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 912 } 913 914 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0); 915 if (attr->notification >= 0 && attr->notification < 32768) { 916 eap_sim_state(data, FAILURE); 917 } else if (attr->notification == EAP_SIM_SUCCESS && 918 data->state == RESULT_SUCCESS) 919 eap_sim_state(data, SUCCESS); 920 return eap_sim_response_notification(data, id, attr->notification); 921 } 922 923 924 static struct wpabuf * eap_sim_process_reauthentication( 925 struct eap_sm *sm, struct eap_sim_data *data, u8 id, 926 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 927 { 928 struct eap_sim_attrs eattr; 929 u8 *decrypted; 930 931 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication"); 932 933 if (data->reauth_id == NULL) { 934 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying " 935 "reauthentication, but no reauth_id available"); 936 return eap_sim_client_error(data, id, 937 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 938 } 939 940 data->reauth = 1; 941 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0)) 942 { 943 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication " 944 "did not have valid AT_MAC"); 945 return eap_sim_client_error(data, id, 946 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 947 } 948 949 if (attr->encr_data == NULL || attr->iv == NULL) { 950 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication " 951 "message did not include encrypted data"); 952 return eap_sim_client_error(data, id, 953 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 954 } 955 956 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 957 attr->encr_data_len, attr->iv, &eattr, 958 0); 959 if (decrypted == NULL) { 960 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted " 961 "data from reauthentication message"); 962 return eap_sim_client_error(data, id, 963 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 964 } 965 966 if (eattr.nonce_s == NULL || eattr.counter < 0) { 967 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet", 968 !eattr.nonce_s ? " AT_NONCE_S" : "", 969 eattr.counter < 0 ? " AT_COUNTER" : ""); 970 os_free(decrypted); 971 return eap_sim_client_error(data, id, 972 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 973 } 974 975 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) { 976 struct wpabuf *res; 977 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter " 978 "(%d <= %d)", eattr.counter, data->counter); 979 data->counter_too_small = eattr.counter; 980 981 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current 982 * reauth_id must not be used to start a new reauthentication. 983 * However, since it was used in the last EAP-Response-Identity 984 * packet, it has to saved for the following fullauth to be 985 * used in MK derivation. */ 986 os_free(data->last_eap_identity); 987 data->last_eap_identity = data->reauth_id; 988 data->last_eap_identity_len = data->reauth_id_len; 989 data->reauth_id = NULL; 990 data->reauth_id_len = 0; 991 992 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s); 993 os_free(decrypted); 994 995 return res; 996 } 997 data->counter = eattr.counter; 998 999 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN); 1000 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S", 1001 data->nonce_s, EAP_SIM_NONCE_S_LEN); 1002 1003 eap_sim_derive_keys_reauth(data->counter, 1004 data->reauth_id, data->reauth_id_len, 1005 data->nonce_s, data->mk, data->msk, 1006 data->emsk); 1007 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1008 eap_sim_learn_ids(sm, data, &eattr); 1009 1010 if (data->result_ind && attr->result_ind) 1011 data->use_result_ind = 1; 1012 1013 if (data->state != FAILURE) { 1014 eap_sim_state(data, data->use_result_ind ? 1015 RESULT_SUCCESS : SUCCESS); 1016 } 1017 1018 data->num_id_req = 0; 1019 data->num_notification = 0; 1020 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) { 1021 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of " 1022 "fast reauths performed - force fullauth"); 1023 eap_sim_clear_identities(sm, data, 1024 CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1025 } 1026 os_free(decrypted); 1027 return eap_sim_response_reauth(data, id, 0, data->nonce_s); 1028 } 1029 1030 1031 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv, 1032 struct eap_method_ret *ret, 1033 const struct wpabuf *reqData) 1034 { 1035 struct eap_sim_data *data = priv; 1036 const struct eap_hdr *req; 1037 u8 subtype, id; 1038 struct wpabuf *res; 1039 const u8 *pos; 1040 struct eap_sim_attrs attr; 1041 size_t len; 1042 1043 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData); 1044 if (eap_get_config_identity(sm, &len) == NULL) { 1045 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured"); 1046 eap_sm_request_identity(sm); 1047 ret->ignore = TRUE; 1048 return NULL; 1049 } 1050 1051 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len); 1052 if (pos == NULL || len < 3) { 1053 ret->ignore = TRUE; 1054 return NULL; 1055 } 1056 req = wpabuf_head(reqData); 1057 id = req->identifier; 1058 len = be_to_host16(req->length); 1059 1060 ret->ignore = FALSE; 1061 ret->methodState = METHOD_MAY_CONT; 1062 ret->decision = DECISION_FAIL; 1063 ret->allowNotifications = TRUE; 1064 1065 subtype = *pos++; 1066 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype); 1067 pos += 2; /* Reserved */ 1068 1069 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0, 1070 0)) { 1071 res = eap_sim_client_error(data, id, 1072 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1073 goto done; 1074 } 1075 1076 switch (subtype) { 1077 case EAP_SIM_SUBTYPE_START: 1078 res = eap_sim_process_start(sm, data, id, &attr); 1079 break; 1080 case EAP_SIM_SUBTYPE_CHALLENGE: 1081 res = eap_sim_process_challenge(sm, data, id, reqData, &attr); 1082 break; 1083 case EAP_SIM_SUBTYPE_NOTIFICATION: 1084 res = eap_sim_process_notification(sm, data, id, reqData, 1085 &attr); 1086 break; 1087 case EAP_SIM_SUBTYPE_REAUTHENTICATION: 1088 res = eap_sim_process_reauthentication(sm, data, id, reqData, 1089 &attr); 1090 break; 1091 case EAP_SIM_SUBTYPE_CLIENT_ERROR: 1092 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error"); 1093 res = eap_sim_client_error(data, id, 1094 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1095 break; 1096 default: 1097 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype); 1098 res = eap_sim_client_error(data, id, 1099 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1100 break; 1101 } 1102 1103 done: 1104 if (data->state == FAILURE) { 1105 ret->decision = DECISION_FAIL; 1106 ret->methodState = METHOD_DONE; 1107 } else if (data->state == SUCCESS) { 1108 ret->decision = data->use_result_ind ? 1109 DECISION_UNCOND_SUCC : DECISION_COND_SUCC; 1110 ret->methodState = data->use_result_ind ? 1111 METHOD_DONE : METHOD_MAY_CONT; 1112 } else if (data->state == RESULT_SUCCESS) 1113 ret->methodState = METHOD_CONT; 1114 1115 if (ret->methodState == METHOD_DONE) { 1116 ret->allowNotifications = FALSE; 1117 } 1118 1119 return res; 1120 } 1121 1122 1123 static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv) 1124 { 1125 struct eap_sim_data *data = priv; 1126 return data->pseudonym || data->reauth_id; 1127 } 1128 1129 1130 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv) 1131 { 1132 struct eap_sim_data *data = priv; 1133 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID); 1134 data->use_result_ind = 0; 1135 eap_sim_clear_keys(data, 1); 1136 } 1137 1138 1139 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv) 1140 { 1141 struct eap_sim_data *data = priv; 1142 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) { 1143 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data " 1144 "for NONCE_MT"); 1145 eap_sim_deinit(sm, data); 1146 return NULL; 1147 } 1148 data->num_id_req = 0; 1149 data->num_notification = 0; 1150 eap_sim_state(data, CONTINUE); 1151 return priv; 1152 } 1153 1154 1155 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv, 1156 size_t *len) 1157 { 1158 struct eap_sim_data *data = priv; 1159 1160 if (data->reauth_id) { 1161 *len = data->reauth_id_len; 1162 return data->reauth_id; 1163 } 1164 1165 if (data->pseudonym) { 1166 *len = data->pseudonym_len; 1167 return data->pseudonym; 1168 } 1169 1170 return NULL; 1171 } 1172 1173 1174 static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv) 1175 { 1176 struct eap_sim_data *data = priv; 1177 return data->state == SUCCESS; 1178 } 1179 1180 1181 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len) 1182 { 1183 struct eap_sim_data *data = priv; 1184 u8 *key; 1185 1186 if (data->state != SUCCESS) 1187 return NULL; 1188 1189 key = os_malloc(EAP_SIM_KEYING_DATA_LEN); 1190 if (key == NULL) 1191 return NULL; 1192 1193 *len = EAP_SIM_KEYING_DATA_LEN; 1194 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN); 1195 1196 return key; 1197 } 1198 1199 1200 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1201 { 1202 struct eap_sim_data *data = priv; 1203 u8 *id; 1204 1205 if (data->state != SUCCESS) 1206 return NULL; 1207 1208 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN; 1209 id = os_malloc(*len); 1210 if (id == NULL) 1211 return NULL; 1212 1213 id[0] = EAP_TYPE_SIM; 1214 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN); 1215 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN, data->nonce_mt, 1216 EAP_SIM_NONCE_MT_LEN); 1217 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len); 1218 1219 return id; 1220 } 1221 1222 1223 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1224 { 1225 struct eap_sim_data *data = priv; 1226 u8 *key; 1227 1228 if (data->state != SUCCESS) 1229 return NULL; 1230 1231 key = os_malloc(EAP_EMSK_LEN); 1232 if (key == NULL) 1233 return NULL; 1234 1235 *len = EAP_EMSK_LEN; 1236 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1237 1238 return key; 1239 } 1240 1241 1242 int eap_peer_sim_register(void) 1243 { 1244 struct eap_method *eap; 1245 1246 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1247 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM"); 1248 if (eap == NULL) 1249 return -1; 1250 1251 eap->init = eap_sim_init; 1252 eap->deinit = eap_sim_deinit; 1253 eap->process = eap_sim_process; 1254 eap->isKeyAvailable = eap_sim_isKeyAvailable; 1255 eap->getKey = eap_sim_getKey; 1256 eap->getSessionId = eap_sim_get_session_id; 1257 eap->has_reauth_data = eap_sim_has_reauth_data; 1258 eap->deinit_for_reauth = eap_sim_deinit_for_reauth; 1259 eap->init_for_reauth = eap_sim_init_for_reauth; 1260 eap->get_identity = eap_sim_get_identity; 1261 eap->get_emsk = eap_sim_get_emsk; 1262 1263 return eap_peer_method_register(eap); 1264 } 1265
