1 /* 2 * EAP peer method: EAP-SIM (RFC 4186) 3 * Copyright (c) 2004-2012, 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 "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 u8 reauth_mac[EAP_SIM_MAC_LEN]; 36 37 int num_id_req, num_notification; 38 u8 *pseudonym; 39 size_t pseudonym_len; 40 u8 *reauth_id; 41 size_t reauth_id_len; 42 int reauth; 43 unsigned int counter, counter_too_small; 44 u8 *last_eap_identity; 45 size_t last_eap_identity_len; 46 enum { 47 CONTINUE, START_DONE, RESULT_SUCCESS, SUCCESS, FAILURE 48 } state; 49 int result_ind, use_result_ind; 50 int use_pseudonym; 51 int error_code; 52 }; 53 54 55 #ifndef CONFIG_NO_STDOUT_DEBUG 56 static const char * eap_sim_state_txt(int state) 57 { 58 switch (state) { 59 case CONTINUE: 60 return "CONTINUE"; 61 case START_DONE: 62 return "START_DONE"; 63 case RESULT_SUCCESS: 64 return "RESULT_SUCCESS"; 65 case SUCCESS: 66 return "SUCCESS"; 67 case FAILURE: 68 return "FAILURE"; 69 default: 70 return "?"; 71 } 72 } 73 #endif /* CONFIG_NO_STDOUT_DEBUG */ 74 75 76 static void eap_sim_state(struct eap_sim_data *data, int state) 77 { 78 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s", 79 eap_sim_state_txt(data->state), 80 eap_sim_state_txt(state)); 81 data->state = state; 82 } 83 84 85 static void * eap_sim_init(struct eap_sm *sm) 86 { 87 struct eap_sim_data *data; 88 struct eap_peer_config *config = eap_get_config(sm); 89 90 data = os_zalloc(sizeof(*data)); 91 if (data == NULL) 92 return NULL; 93 94 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) { 95 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data " 96 "for NONCE_MT"); 97 os_free(data); 98 return NULL; 99 } 100 101 /* Zero is a valid error code, so we need to initialize */ 102 data->error_code = NO_EAP_METHOD_ERROR; 103 104 data->min_num_chal = 2; 105 if (config && config->phase1) { 106 char *pos = os_strstr(config->phase1, "sim_min_num_chal="); 107 if (pos) { 108 data->min_num_chal = atoi(pos + 17); 109 if (data->min_num_chal < 2 || data->min_num_chal > 3) { 110 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid " 111 "sim_min_num_chal configuration " 112 "(%lu, expected 2 or 3)", 113 (unsigned long) data->min_num_chal); 114 os_free(data); 115 return NULL; 116 } 117 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of " 118 "challenges to %lu", 119 (unsigned long) data->min_num_chal); 120 } 121 122 data->result_ind = os_strstr(config->phase1, "result_ind=1") != 123 NULL; 124 } 125 126 data->use_pseudonym = !sm->init_phase2; 127 if (config && config->anonymous_identity && data->use_pseudonym) { 128 data->pseudonym = os_malloc(config->anonymous_identity_len); 129 if (data->pseudonym) { 130 os_memcpy(data->pseudonym, config->anonymous_identity, 131 config->anonymous_identity_len); 132 data->pseudonym_len = config->anonymous_identity_len; 133 } 134 } 135 136 eap_sim_state(data, CONTINUE); 137 138 return data; 139 } 140 141 142 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth) 143 { 144 if (!reauth) { 145 os_memset(data->mk, 0, EAP_SIM_MK_LEN); 146 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN); 147 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN); 148 } 149 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN); 150 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN); 151 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN); 152 os_memset(data->emsk, 0, EAP_EMSK_LEN); 153 } 154 155 156 static void eap_sim_deinit(struct eap_sm *sm, void *priv) 157 { 158 struct eap_sim_data *data = priv; 159 if (data) { 160 os_free(data->ver_list); 161 os_free(data->pseudonym); 162 os_free(data->reauth_id); 163 os_free(data->last_eap_identity); 164 eap_sim_clear_keys(data, 0); 165 os_free(data); 166 } 167 } 168 169 170 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data) 171 { 172 char req[200], *pos, *end; 173 size_t i; 174 175 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing"); 176 pos = req; 177 end = pos + sizeof(req); 178 pos += os_snprintf(pos, end - pos, "GSM-AUTH"); 179 for (i = 0; i < data->num_chal; i++) { 180 pos += os_snprintf(pos, end - pos, ":"); 181 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i], 182 GSM_RAND_LEN); 183 } 184 185 eap_sm_request_sim(sm, req); 186 return 1; 187 } 188 189 190 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data, 191 struct eap_peer_config *conf) 192 { 193 char *resp, *pos; 194 size_t i; 195 196 wpa_printf(MSG_DEBUG, 197 "EAP-SIM: Use result from external SIM processing"); 198 199 resp = conf->external_sim_resp; 200 conf->external_sim_resp = NULL; 201 202 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) { 203 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response"); 204 os_free(resp); 205 return -1; 206 } 207 208 pos = resp + 9; 209 for (i = 0; i < data->num_chal; i++) { 210 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND", 211 data->rand[i], GSM_RAND_LEN); 212 213 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0) 214 goto invalid; 215 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc", 216 data->kc[i], EAP_SIM_KC_LEN); 217 pos += EAP_SIM_KC_LEN * 2; 218 if (*pos != ':') 219 goto invalid; 220 pos++; 221 222 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0) 223 goto invalid; 224 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES", 225 data->sres[i], EAP_SIM_SRES_LEN); 226 pos += EAP_SIM_SRES_LEN * 2; 227 if (i + 1 < data->num_chal) { 228 if (*pos != ':') 229 goto invalid; 230 pos++; 231 } 232 } 233 234 os_free(resp); 235 return 0; 236 237 invalid: 238 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response"); 239 os_free(resp); 240 return -1; 241 } 242 243 244 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data) 245 { 246 struct eap_peer_config *conf; 247 248 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm"); 249 250 conf = eap_get_config(sm); 251 if (conf == NULL) 252 return -1; 253 254 if (sm->external_sim) { 255 if (conf->external_sim_resp) 256 return eap_sim_ext_sim_result(sm, data, conf); 257 else 258 return eap_sim_ext_sim_req(sm, data); 259 } 260 261 #ifdef PCSC_FUNCS 262 if (conf->pcsc) { 263 if (scard_gsm_auth(sm->scard_ctx, data->rand[0], 264 data->sres[0], data->kc[0]) || 265 scard_gsm_auth(sm->scard_ctx, data->rand[1], 266 data->sres[1], data->kc[1]) || 267 (data->num_chal > 2 && 268 scard_gsm_auth(sm->scard_ctx, data->rand[2], 269 data->sres[2], data->kc[2]))) { 270 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM " 271 "authentication could not be completed"); 272 return -1; 273 } 274 return 0; 275 } 276 #endif /* PCSC_FUNCS */ 277 278 #ifdef CONFIG_SIM_SIMULATOR 279 if (conf->password) { 280 u8 opc[16], k[16]; 281 const char *pos; 282 size_t i; 283 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage " 284 "implementation for authentication"); 285 if (conf->password_len < 65) { 286 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage " 287 "password"); 288 return -1; 289 } 290 pos = (const char *) conf->password; 291 if (hexstr2bin(pos, k, 16)) 292 return -1; 293 pos += 32; 294 if (*pos != ':') 295 return -1; 296 pos++; 297 298 if (hexstr2bin(pos, opc, 16)) 299 return -1; 300 301 for (i = 0; i < data->num_chal; i++) { 302 if (gsm_milenage(opc, k, data->rand[i], 303 data->sres[i], data->kc[i])) { 304 wpa_printf(MSG_DEBUG, "EAP-SIM: " 305 "GSM-Milenage authentication " 306 "could not be completed"); 307 return -1; 308 } 309 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND", 310 data->rand[i], GSM_RAND_LEN); 311 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES", 312 data->sres[i], EAP_SIM_SRES_LEN); 313 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc", 314 data->kc[i], EAP_SIM_KC_LEN); 315 } 316 return 0; 317 } 318 #endif /* CONFIG_SIM_SIMULATOR */ 319 320 #ifdef CONFIG_SIM_HARDCODED 321 /* These hardcoded Kc and SRES values are used for testing. RAND to 322 * KC/SREC mapping is very bogus as far as real authentication is 323 * concerned, but it is quite useful for cases where the AS is rotating 324 * the order of pre-configured values. */ 325 { 326 size_t i; 327 328 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES " 329 "values for testing"); 330 331 for (i = 0; i < data->num_chal; i++) { 332 if (data->rand[i][0] == 0xaa) { 333 os_memcpy(data->kc[i], 334 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7", 335 EAP_SIM_KC_LEN); 336 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4", 337 EAP_SIM_SRES_LEN); 338 } else if (data->rand[i][0] == 0xbb) { 339 os_memcpy(data->kc[i], 340 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7", 341 EAP_SIM_KC_LEN); 342 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4", 343 EAP_SIM_SRES_LEN); 344 } else { 345 os_memcpy(data->kc[i], 346 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7", 347 EAP_SIM_KC_LEN); 348 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4", 349 EAP_SIM_SRES_LEN); 350 } 351 } 352 } 353 354 return 0; 355 356 #else /* CONFIG_SIM_HARDCODED */ 357 358 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm " 359 "enabled"); 360 return -1; 361 362 #endif /* CONFIG_SIM_HARDCODED */ 363 } 364 365 366 static int eap_sim_supported_ver(int version) 367 { 368 return version == EAP_SIM_VERSION; 369 } 370 371 372 #define CLEAR_PSEUDONYM 0x01 373 #define CLEAR_REAUTH_ID 0x02 374 #define CLEAR_EAP_ID 0x04 375 376 static void eap_sim_clear_identities(struct eap_sm *sm, 377 struct eap_sim_data *data, int id) 378 { 379 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) { 380 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym"); 381 os_free(data->pseudonym); 382 data->pseudonym = NULL; 383 data->pseudonym_len = 0; 384 if (data->use_pseudonym) 385 eap_set_anon_id(sm, NULL, 0); 386 } 387 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) { 388 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id"); 389 os_free(data->reauth_id); 390 data->reauth_id = NULL; 391 data->reauth_id_len = 0; 392 } 393 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) { 394 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id"); 395 os_free(data->last_eap_identity); 396 data->last_eap_identity = NULL; 397 data->last_eap_identity_len = 0; 398 } 399 } 400 401 402 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data, 403 struct eap_sim_attrs *attr) 404 { 405 if (attr->next_pseudonym) { 406 const u8 *identity = NULL; 407 size_t identity_len = 0; 408 const u8 *realm = NULL; 409 size_t realm_len = 0; 410 411 wpa_hexdump_ascii(MSG_DEBUG, 412 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM", 413 attr->next_pseudonym, 414 attr->next_pseudonym_len); 415 os_free(data->pseudonym); 416 /* Look for the realm of the permanent identity */ 417 identity = eap_get_config_identity(sm, &identity_len); 418 if (identity) { 419 for (realm = identity, realm_len = identity_len; 420 realm_len > 0; realm_len--, realm++) { 421 if (*realm == '@') 422 break; 423 } 424 } 425 data->pseudonym = os_malloc(attr->next_pseudonym_len + 426 realm_len); 427 if (data->pseudonym == NULL) { 428 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for " 429 "next pseudonym"); 430 data->pseudonym_len = 0; 431 return -1; 432 } 433 os_memcpy(data->pseudonym, attr->next_pseudonym, 434 attr->next_pseudonym_len); 435 if (realm_len) { 436 os_memcpy(data->pseudonym + attr->next_pseudonym_len, 437 realm, realm_len); 438 } 439 data->pseudonym_len = attr->next_pseudonym_len + realm_len; 440 if (data->use_pseudonym) 441 eap_set_anon_id(sm, data->pseudonym, 442 data->pseudonym_len); 443 } 444 445 if (attr->next_reauth_id) { 446 os_free(data->reauth_id); 447 data->reauth_id = os_memdup(attr->next_reauth_id, 448 attr->next_reauth_id_len); 449 if (data->reauth_id == NULL) { 450 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for " 451 "next reauth_id"); 452 data->reauth_id_len = 0; 453 return -1; 454 } 455 data->reauth_id_len = attr->next_reauth_id_len; 456 wpa_hexdump_ascii(MSG_DEBUG, 457 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID", 458 data->reauth_id, 459 data->reauth_id_len); 460 } 461 462 return 0; 463 } 464 465 466 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id, 467 int err) 468 { 469 struct eap_sim_msg *msg; 470 471 eap_sim_state(data, FAILURE); 472 data->num_id_req = 0; 473 data->num_notification = 0; 474 475 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)", 476 err); 477 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 478 EAP_SIM_SUBTYPE_CLIENT_ERROR); 479 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0); 480 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0); 481 } 482 483 484 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm, 485 struct eap_sim_data *data, u8 id, 486 enum eap_sim_id_req id_req) 487 { 488 const u8 *identity = NULL; 489 size_t identity_len = 0; 490 struct eap_sim_msg *msg; 491 struct wpabuf *resp; 492 493 data->reauth = 0; 494 if (id_req == ANY_ID && data->reauth_id) { 495 identity = data->reauth_id; 496 identity_len = data->reauth_id_len; 497 data->reauth = 1; 498 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) && 499 data->pseudonym && 500 !eap_sim_anonymous_username(data->pseudonym, 501 data->pseudonym_len)) { 502 identity = data->pseudonym; 503 identity_len = data->pseudonym_len; 504 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID); 505 } else if (id_req != NO_ID_REQ) { 506 identity = eap_get_config_identity(sm, &identity_len); 507 if (identity) { 508 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID; 509 510 if (data->pseudonym && 511 eap_sim_anonymous_username(data->pseudonym, 512 data->pseudonym_len)) 513 ids &= ~CLEAR_PSEUDONYM; 514 eap_sim_clear_identities(sm, data, ids); 515 } 516 } 517 if (id_req != NO_ID_REQ) 518 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID); 519 520 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id); 521 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, 522 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START); 523 if (identity) { 524 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY", 525 identity, identity_len); 526 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len, 527 identity, identity_len); 528 } 529 if (!data->reauth) { 530 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT", 531 data->nonce_mt, EAP_SIM_NONCE_MT_LEN); 532 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0, 533 data->nonce_mt, EAP_SIM_NONCE_MT_LEN); 534 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d", 535 data->selected_version); 536 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION, 537 data->selected_version, NULL, 0); 538 } 539 540 resp = eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0); 541 if (resp) 542 eap_sim_state(data, START_DONE); 543 return resp; 544 } 545 546 547 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data, 548 u8 id) 549 { 550 struct eap_sim_msg *msg; 551 552 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id); 553 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 554 EAP_SIM_SUBTYPE_CHALLENGE); 555 if (data->use_result_ind) { 556 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 557 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 558 } 559 wpa_printf(MSG_DEBUG, " AT_MAC"); 560 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 561 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, 562 (u8 *) data->sres, 563 data->num_chal * EAP_SIM_SRES_LEN); 564 } 565 566 567 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data, 568 u8 id, int counter_too_small, 569 const u8 *nonce_s) 570 { 571 struct eap_sim_msg *msg; 572 unsigned int counter; 573 574 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)", 575 id); 576 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM, 577 EAP_SIM_SUBTYPE_REAUTHENTICATION); 578 wpa_printf(MSG_DEBUG, " AT_IV"); 579 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 580 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); 581 582 if (counter_too_small) { 583 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL"); 584 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0); 585 counter = data->counter_too_small; 586 } else 587 counter = data->counter; 588 589 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter); 590 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0); 591 592 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { 593 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt " 594 "AT_ENCR_DATA"); 595 eap_sim_msg_free(msg); 596 return NULL; 597 } 598 if (data->use_result_ind) { 599 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 600 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 601 } 602 wpa_printf(MSG_DEBUG, " AT_MAC"); 603 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 604 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s, 605 EAP_SIM_NONCE_S_LEN); 606 } 607 608 609 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data, 610 u8 id, u16 notification) 611 { 612 struct eap_sim_msg *msg; 613 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL; 614 615 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id); 616 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, 617 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION); 618 if (k_aut && data->reauth) { 619 wpa_printf(MSG_DEBUG, " AT_IV"); 620 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 621 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, 622 EAP_SIM_AT_ENCR_DATA); 623 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter); 624 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter, 625 NULL, 0); 626 if (eap_sim_msg_add_encr_end(msg, data->k_encr, 627 EAP_SIM_AT_PADDING)) { 628 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt " 629 "AT_ENCR_DATA"); 630 eap_sim_msg_free(msg); 631 return NULL; 632 } 633 } 634 if (k_aut) { 635 wpa_printf(MSG_DEBUG, " AT_MAC"); 636 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 637 } 638 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0); 639 } 640 641 642 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm, 643 struct eap_sim_data *data, u8 id, 644 struct eap_sim_attrs *attr) 645 { 646 int selected_version = -1, id_error; 647 size_t i; 648 u8 *pos; 649 650 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start"); 651 if (attr->version_list == NULL) { 652 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in " 653 "SIM/Start"); 654 return eap_sim_client_error(data, id, 655 EAP_SIM_UNSUPPORTED_VERSION); 656 } 657 658 os_free(data->ver_list); 659 data->ver_list = os_memdup(attr->version_list, attr->version_list_len); 660 if (data->ver_list == NULL) { 661 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate " 662 "memory for version list"); 663 return eap_sim_client_error(data, id, 664 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 665 } 666 data->ver_list_len = attr->version_list_len; 667 pos = data->ver_list; 668 for (i = 0; i < data->ver_list_len / 2; i++) { 669 int ver = pos[0] * 256 + pos[1]; 670 pos += 2; 671 if (eap_sim_supported_ver(ver)) { 672 selected_version = ver; 673 break; 674 } 675 } 676 if (selected_version < 0) { 677 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported " 678 "version"); 679 return eap_sim_client_error(data, id, 680 EAP_SIM_UNSUPPORTED_VERSION); 681 } 682 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d", 683 selected_version); 684 data->selected_version = selected_version; 685 686 id_error = 0; 687 switch (attr->id_req) { 688 case NO_ID_REQ: 689 break; 690 case ANY_ID: 691 if (data->num_id_req > 0) 692 id_error++; 693 data->num_id_req++; 694 break; 695 case FULLAUTH_ID: 696 if (data->num_id_req > 1) 697 id_error++; 698 data->num_id_req++; 699 break; 700 case PERMANENT_ID: 701 if (data->num_id_req > 2) 702 id_error++; 703 data->num_id_req++; 704 break; 705 } 706 if (id_error) { 707 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests " 708 "used within one authentication"); 709 return eap_sim_client_error(data, id, 710 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 711 } 712 713 return eap_sim_response_start(sm, data, id, attr->id_req); 714 } 715 716 717 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm, 718 struct eap_sim_data *data, 719 u8 id, 720 const struct wpabuf *reqData, 721 struct eap_sim_attrs *attr) 722 { 723 const u8 *identity; 724 size_t identity_len; 725 struct eap_sim_attrs eattr; 726 int res; 727 728 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge"); 729 if (data->state != START_DONE) { 730 wpa_printf(MSG_DEBUG, 731 "EAP-SIM: Unexpected Challenge in state %s", 732 eap_sim_state_txt(data->state)); 733 return eap_sim_client_error(data, id, 734 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 735 } 736 data->reauth = 0; 737 if (!attr->mac || !attr->rand) { 738 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message " 739 "did not include%s%s", 740 !attr->mac ? " AT_MAC" : "", 741 !attr->rand ? " AT_RAND" : ""); 742 return eap_sim_client_error(data, id, 743 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 744 } 745 746 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges", 747 (unsigned long) attr->num_chal); 748 if (attr->num_chal < data->min_num_chal) { 749 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of " 750 "challenges (%lu)", (unsigned long) attr->num_chal); 751 return eap_sim_client_error(data, id, 752 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL); 753 } 754 if (attr->num_chal > 3) { 755 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges " 756 "(%lu)", (unsigned long) attr->num_chal); 757 return eap_sim_client_error(data, id, 758 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 759 } 760 761 /* Verify that RANDs are different */ 762 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN, 763 GSM_RAND_LEN) == 0 || 764 (attr->num_chal > 2 && 765 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN, 766 GSM_RAND_LEN) == 0 || 767 os_memcmp(attr->rand + GSM_RAND_LEN, 768 attr->rand + 2 * GSM_RAND_LEN, 769 GSM_RAND_LEN) == 0))) { 770 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times"); 771 return eap_sim_client_error(data, id, 772 EAP_SIM_RAND_NOT_FRESH); 773 } 774 775 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN); 776 data->num_chal = attr->num_chal; 777 778 res = eap_sim_gsm_auth(sm, data); 779 if (res > 0) { 780 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing"); 781 return NULL; 782 } 783 if (res) { 784 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed"); 785 return eap_sim_client_error(data, id, 786 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 787 } 788 if (data->last_eap_identity) { 789 identity = data->last_eap_identity; 790 identity_len = data->last_eap_identity_len; 791 } else if (data->pseudonym && 792 !eap_sim_anonymous_username(data->pseudonym, 793 data->pseudonym_len)) { 794 identity = data->pseudonym; 795 identity_len = data->pseudonym_len; 796 } else { 797 struct eap_peer_config *config; 798 799 config = eap_get_config(sm); 800 if (config && config->imsi_identity) { 801 identity = config->imsi_identity; 802 identity_len = config->imsi_identity_len; 803 } else { 804 identity = eap_get_config_identity(sm, &identity_len); 805 } 806 } 807 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK " 808 "derivation", identity, identity_len); 809 eap_sim_derive_mk(identity, identity_len, data->nonce_mt, 810 data->selected_version, data->ver_list, 811 data->ver_list_len, data->num_chal, 812 (const u8 *) data->kc, data->mk); 813 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk, 814 data->emsk); 815 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt, 816 EAP_SIM_NONCE_MT_LEN)) { 817 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message " 818 "used invalid AT_MAC"); 819 #ifdef TEST_FUZZ 820 wpa_printf(MSG_INFO, 821 "TEST: Ignore AT_MAC mismatch for fuzz testing"); 822 #else /* TEST_FUZZ */ 823 return eap_sim_client_error(data, id, 824 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 825 #endif /* TEST_FUZZ */ 826 } 827 828 /* Old reauthentication identity must not be used anymore. In 829 * other words, if no new reauth identity is received, full 830 * authentication will be used on next reauthentication (using 831 * pseudonym identity or permanent identity). */ 832 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 833 834 if (attr->encr_data) { 835 u8 *decrypted; 836 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 837 attr->encr_data_len, attr->iv, 838 &eattr, 0); 839 if (decrypted == NULL) { 840 return eap_sim_client_error( 841 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET); 842 } 843 eap_sim_learn_ids(sm, data, &eattr); 844 os_free(decrypted); 845 } 846 847 if (data->result_ind && attr->result_ind) 848 data->use_result_ind = 1; 849 850 if (data->state != FAILURE) { 851 eap_sim_state(data, data->use_result_ind ? 852 RESULT_SUCCESS : SUCCESS); 853 } 854 855 data->num_id_req = 0; 856 data->num_notification = 0; 857 /* RFC 4186 specifies that counter is initialized to one after 858 * fullauth, but initializing it to zero makes it easier to implement 859 * reauth verification. */ 860 data->counter = 0; 861 return eap_sim_response_challenge(data, id); 862 } 863 864 865 static int eap_sim_process_notification_reauth(struct eap_sim_data *data, 866 struct eap_sim_attrs *attr) 867 { 868 struct eap_sim_attrs eattr; 869 u8 *decrypted; 870 871 if (attr->encr_data == NULL || attr->iv == NULL) { 872 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after " 873 "reauth did not include encrypted data"); 874 return -1; 875 } 876 877 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 878 attr->encr_data_len, attr->iv, &eattr, 879 0); 880 if (decrypted == NULL) { 881 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted " 882 "data from notification message"); 883 return -1; 884 } 885 886 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) { 887 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification " 888 "message does not match with counter in reauth " 889 "message"); 890 os_free(decrypted); 891 return -1; 892 } 893 894 os_free(decrypted); 895 return 0; 896 } 897 898 899 static int eap_sim_process_notification_auth(struct eap_sim_data *data, 900 const struct wpabuf *reqData, 901 struct eap_sim_attrs *attr) 902 { 903 if (attr->mac == NULL) { 904 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth " 905 "Notification message"); 906 return -1; 907 } 908 909 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0)) 910 { 911 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message " 912 "used invalid AT_MAC"); 913 return -1; 914 } 915 916 if (data->reauth && 917 eap_sim_process_notification_reauth(data, attr)) { 918 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification " 919 "message after reauth"); 920 return -1; 921 } 922 923 return 0; 924 } 925 926 927 static struct wpabuf * eap_sim_process_notification( 928 struct eap_sm *sm, struct eap_sim_data *data, u8 id, 929 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 930 { 931 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification"); 932 if (data->num_notification > 0) { 933 wpa_printf(MSG_INFO, "EAP-SIM: too many notification " 934 "rounds (only one allowed)"); 935 return eap_sim_client_error(data, id, 936 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 937 } 938 data->num_notification++; 939 if (attr->notification == -1) { 940 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in " 941 "Notification message"); 942 return eap_sim_client_error(data, id, 943 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 944 } 945 946 if ((attr->notification & 0x4000) == 0 && 947 eap_sim_process_notification_auth(data, reqData, attr)) { 948 return eap_sim_client_error(data, id, 949 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 950 } 951 952 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0); 953 if (attr->notification >= 0 && attr->notification < 32768) { 954 data->error_code = attr->notification; 955 eap_sim_state(data, FAILURE); 956 } else if (attr->notification == EAP_SIM_SUCCESS && 957 data->state == RESULT_SUCCESS) 958 eap_sim_state(data, SUCCESS); 959 return eap_sim_response_notification(data, id, attr->notification); 960 } 961 962 963 static struct wpabuf * eap_sim_process_reauthentication( 964 struct eap_sm *sm, struct eap_sim_data *data, u8 id, 965 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 966 { 967 struct eap_sim_attrs eattr; 968 u8 *decrypted; 969 970 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication"); 971 972 if (data->reauth_id == NULL) { 973 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying " 974 "reauthentication, but no reauth_id available"); 975 return eap_sim_client_error(data, id, 976 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 977 } 978 979 data->reauth = 1; 980 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0)) 981 { 982 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication " 983 "did not have valid AT_MAC"); 984 #ifdef TEST_FUZZ 985 wpa_printf(MSG_INFO, 986 "TEST: Ignore AT_MAC mismatch for fuzz testing"); 987 #else /* TEST_FUZZ */ 988 return eap_sim_client_error(data, id, 989 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 990 #endif /* TEST_FUZZ */ 991 } 992 993 /* At this stage the received MAC has been verified. Use this MAC for 994 * reauth Session-Id calculation if all other checks pass. 995 * The peer does not use the local MAC but the received MAC in deriving 996 * Session-Id. */ 997 #ifdef TEST_FUZZ 998 if (attr->mac) 999 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN); 1000 else 1001 os_memset(data->reauth_mac, 0x12, EAP_SIM_MAC_LEN); 1002 #else /* TEST_FUZZ */ 1003 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN); 1004 #endif /* TEST_FUZZ */ 1005 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Server MAC", 1006 data->reauth_mac, EAP_SIM_MAC_LEN); 1007 1008 if (attr->encr_data == NULL || attr->iv == NULL) { 1009 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication " 1010 "message did not include encrypted data"); 1011 return eap_sim_client_error(data, id, 1012 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1013 } 1014 1015 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 1016 attr->encr_data_len, attr->iv, &eattr, 1017 0); 1018 if (decrypted == NULL) { 1019 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted " 1020 "data from reauthentication message"); 1021 return eap_sim_client_error(data, id, 1022 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1023 } 1024 1025 if (eattr.nonce_s == NULL || eattr.counter < 0) { 1026 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet", 1027 !eattr.nonce_s ? " AT_NONCE_S" : "", 1028 eattr.counter < 0 ? " AT_COUNTER" : ""); 1029 os_free(decrypted); 1030 return eap_sim_client_error(data, id, 1031 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1032 } 1033 1034 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) { 1035 struct wpabuf *res; 1036 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter " 1037 "(%d <= %d)", eattr.counter, data->counter); 1038 data->counter_too_small = eattr.counter; 1039 1040 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current 1041 * reauth_id must not be used to start a new reauthentication. 1042 * However, since it was used in the last EAP-Response-Identity 1043 * packet, it has to saved for the following fullauth to be 1044 * used in MK derivation. */ 1045 os_free(data->last_eap_identity); 1046 data->last_eap_identity = data->reauth_id; 1047 data->last_eap_identity_len = data->reauth_id_len; 1048 data->reauth_id = NULL; 1049 data->reauth_id_len = 0; 1050 1051 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s); 1052 os_free(decrypted); 1053 1054 return res; 1055 } 1056 data->counter = eattr.counter; 1057 1058 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN); 1059 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S", 1060 data->nonce_s, EAP_SIM_NONCE_S_LEN); 1061 1062 eap_sim_derive_keys_reauth(data->counter, 1063 data->reauth_id, data->reauth_id_len, 1064 data->nonce_s, data->mk, data->msk, 1065 data->emsk); 1066 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1067 eap_sim_learn_ids(sm, data, &eattr); 1068 1069 if (data->result_ind && attr->result_ind) 1070 data->use_result_ind = 1; 1071 1072 if (data->state != FAILURE) { 1073 eap_sim_state(data, data->use_result_ind ? 1074 RESULT_SUCCESS : SUCCESS); 1075 } 1076 1077 data->num_id_req = 0; 1078 data->num_notification = 0; 1079 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) { 1080 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of " 1081 "fast reauths performed - force fullauth"); 1082 eap_sim_clear_identities(sm, data, 1083 CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1084 } 1085 os_free(decrypted); 1086 return eap_sim_response_reauth(data, id, 0, data->nonce_s); 1087 } 1088 1089 1090 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv, 1091 struct eap_method_ret *ret, 1092 const struct wpabuf *reqData) 1093 { 1094 struct eap_sim_data *data = priv; 1095 const struct eap_hdr *req; 1096 u8 subtype, id; 1097 struct wpabuf *res; 1098 const u8 *pos; 1099 struct eap_sim_attrs attr; 1100 size_t len; 1101 1102 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData); 1103 if (eap_get_config_identity(sm, &len) == NULL) { 1104 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured"); 1105 eap_sm_request_identity(sm); 1106 ret->ignore = true; 1107 return NULL; 1108 } 1109 1110 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len); 1111 if (pos == NULL || len < 3) { 1112 ret->ignore = true; 1113 return NULL; 1114 } 1115 req = wpabuf_head(reqData); 1116 id = req->identifier; 1117 len = be_to_host16(req->length); 1118 1119 ret->ignore = false; 1120 ret->methodState = METHOD_MAY_CONT; 1121 ret->decision = DECISION_FAIL; 1122 ret->allowNotifications = true; 1123 1124 subtype = *pos++; 1125 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype); 1126 pos += 2; /* Reserved */ 1127 1128 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0, 1129 0)) { 1130 res = eap_sim_client_error(data, id, 1131 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1132 goto done; 1133 } 1134 1135 switch (subtype) { 1136 case EAP_SIM_SUBTYPE_START: 1137 res = eap_sim_process_start(sm, data, id, &attr); 1138 break; 1139 case EAP_SIM_SUBTYPE_CHALLENGE: 1140 res = eap_sim_process_challenge(sm, data, id, reqData, &attr); 1141 break; 1142 case EAP_SIM_SUBTYPE_NOTIFICATION: 1143 res = eap_sim_process_notification(sm, data, id, reqData, 1144 &attr); 1145 break; 1146 case EAP_SIM_SUBTYPE_REAUTHENTICATION: 1147 res = eap_sim_process_reauthentication(sm, data, id, reqData, 1148 &attr); 1149 break; 1150 case EAP_SIM_SUBTYPE_CLIENT_ERROR: 1151 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error"); 1152 res = eap_sim_client_error(data, id, 1153 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1154 break; 1155 default: 1156 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype); 1157 res = eap_sim_client_error(data, id, 1158 EAP_SIM_UNABLE_TO_PROCESS_PACKET); 1159 break; 1160 } 1161 1162 done: 1163 if (data->state == FAILURE) { 1164 ret->decision = DECISION_FAIL; 1165 ret->methodState = METHOD_DONE; 1166 } else if (data->state == SUCCESS) { 1167 ret->decision = data->use_result_ind ? 1168 DECISION_UNCOND_SUCC : DECISION_COND_SUCC; 1169 ret->methodState = data->use_result_ind ? 1170 METHOD_DONE : METHOD_MAY_CONT; 1171 } else if (data->state == RESULT_SUCCESS) 1172 ret->methodState = METHOD_CONT; 1173 1174 if (ret->methodState == METHOD_DONE) { 1175 ret->allowNotifications = false; 1176 } 1177 1178 return res; 1179 } 1180 1181 1182 static bool eap_sim_has_reauth_data(struct eap_sm *sm, void *priv) 1183 { 1184 struct eap_sim_data *data = priv; 1185 return data->pseudonym || data->reauth_id; 1186 } 1187 1188 1189 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv) 1190 { 1191 struct eap_sim_data *data = priv; 1192 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID); 1193 data->use_result_ind = 0; 1194 eap_sim_clear_keys(data, 1); 1195 } 1196 1197 1198 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv) 1199 { 1200 struct eap_sim_data *data = priv; 1201 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) { 1202 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data " 1203 "for NONCE_MT"); 1204 eap_sim_deinit(sm, data); 1205 return NULL; 1206 } 1207 data->num_id_req = 0; 1208 data->num_notification = 0; 1209 eap_sim_state(data, CONTINUE); 1210 return priv; 1211 } 1212 1213 1214 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv, 1215 size_t *len) 1216 { 1217 struct eap_sim_data *data = priv; 1218 1219 if (data->reauth_id) { 1220 *len = data->reauth_id_len; 1221 return data->reauth_id; 1222 } 1223 1224 if (data->pseudonym) { 1225 *len = data->pseudonym_len; 1226 return data->pseudonym; 1227 } 1228 1229 return NULL; 1230 } 1231 1232 1233 static bool eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv) 1234 { 1235 struct eap_sim_data *data = priv; 1236 return data->state == SUCCESS; 1237 } 1238 1239 1240 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len) 1241 { 1242 struct eap_sim_data *data = priv; 1243 u8 *key; 1244 1245 if (data->state != SUCCESS) 1246 return NULL; 1247 1248 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN); 1249 if (key == NULL) 1250 return NULL; 1251 1252 *len = EAP_SIM_KEYING_DATA_LEN; 1253 1254 return key; 1255 } 1256 1257 1258 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1259 { 1260 struct eap_sim_data *data = priv; 1261 u8 *id; 1262 1263 if (data->state != SUCCESS) 1264 return NULL; 1265 1266 if (!data->reauth) 1267 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN; 1268 else 1269 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN; 1270 id = os_malloc(*len); 1271 if (id == NULL) 1272 return NULL; 1273 1274 id[0] = EAP_TYPE_SIM; 1275 if (!data->reauth) { 1276 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN); 1277 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN, 1278 data->nonce_mt, EAP_SIM_NONCE_MT_LEN); 1279 } else { 1280 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN); 1281 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac, 1282 EAP_SIM_MAC_LEN); 1283 } 1284 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len); 1285 1286 return id; 1287 } 1288 1289 1290 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1291 { 1292 struct eap_sim_data *data = priv; 1293 u8 *key; 1294 1295 if (data->state != SUCCESS) 1296 return NULL; 1297 1298 key = os_memdup(data->emsk, EAP_EMSK_LEN); 1299 if (key == NULL) 1300 return NULL; 1301 1302 *len = EAP_EMSK_LEN; 1303 1304 return key; 1305 } 1306 1307 1308 static int eap_sim_get_error_code(void *priv) 1309 { 1310 struct eap_sim_data *data = priv; 1311 int current_data_error; 1312 1313 if (!data) 1314 return NO_EAP_METHOD_ERROR; 1315 1316 current_data_error = data->error_code; 1317 1318 /* Now reset for next transaction */ 1319 data->error_code = NO_EAP_METHOD_ERROR; 1320 1321 return current_data_error; 1322 } 1323 1324 1325 int eap_peer_sim_register(void) 1326 { 1327 struct eap_method *eap; 1328 1329 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1330 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM"); 1331 if (eap == NULL) 1332 return -1; 1333 1334 eap->init = eap_sim_init; 1335 eap->deinit = eap_sim_deinit; 1336 eap->process = eap_sim_process; 1337 eap->isKeyAvailable = eap_sim_isKeyAvailable; 1338 eap->getKey = eap_sim_getKey; 1339 eap->getSessionId = eap_sim_get_session_id; 1340 eap->has_reauth_data = eap_sim_has_reauth_data; 1341 eap->deinit_for_reauth = eap_sim_deinit_for_reauth; 1342 eap->init_for_reauth = eap_sim_init_for_reauth; 1343 eap->get_identity = eap_sim_get_identity; 1344 eap->get_emsk = eap_sim_get_emsk; 1345 eap->get_error_code = eap_sim_get_error_code; 1346 1347 return eap_peer_method_register(eap); 1348 } 1349