1 /* 2 * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (RFC 5448) 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/crypto.h" 14 #include "crypto/sha1.h" 15 #include "crypto/sha256.h" 16 #include "crypto/milenage.h" 17 #include "eap_common/eap_sim_common.h" 18 #include "eap_config.h" 19 #include "eap_i.h" 20 21 22 struct eap_aka_data { 23 u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN]; 24 size_t res_len; 25 u8 nonce_s[EAP_SIM_NONCE_S_LEN]; 26 u8 mk[EAP_SIM_MK_LEN]; 27 u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN]; 28 u8 k_encr[EAP_SIM_K_ENCR_LEN]; 29 u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */ 30 u8 msk[EAP_SIM_KEYING_DATA_LEN]; 31 u8 emsk[EAP_EMSK_LEN]; 32 u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN]; 33 u8 auts[EAP_AKA_AUTS_LEN]; 34 35 int num_id_req, num_notification; 36 u8 *pseudonym; 37 size_t pseudonym_len; 38 u8 *reauth_id; 39 size_t reauth_id_len; 40 int reauth; 41 unsigned int counter, counter_too_small; 42 u8 *last_eap_identity; 43 size_t last_eap_identity_len; 44 enum { 45 CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE 46 } state; 47 48 struct wpabuf *id_msgs; 49 int prev_id; 50 int result_ind, use_result_ind; 51 int use_pseudonym; 52 u8 eap_method; 53 u8 *network_name; 54 size_t network_name_len; 55 u16 kdf; 56 int kdf_negotiation; 57 u16 last_kdf_attrs[EAP_AKA_PRIME_KDF_MAX]; 58 size_t last_kdf_count; 59 int error_code; 60 }; 61 62 63 #ifndef CONFIG_NO_STDOUT_DEBUG 64 static const char * eap_aka_state_txt(int state) 65 { 66 switch (state) { 67 case CONTINUE: 68 return "CONTINUE"; 69 case RESULT_SUCCESS: 70 return "RESULT_SUCCESS"; 71 case SUCCESS: 72 return "SUCCESS"; 73 case FAILURE: 74 return "FAILURE"; 75 default: 76 return "?"; 77 } 78 } 79 #endif /* CONFIG_NO_STDOUT_DEBUG */ 80 81 82 static void eap_aka_state(struct eap_aka_data *data, int state) 83 { 84 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s", 85 eap_aka_state_txt(data->state), 86 eap_aka_state_txt(state)); 87 data->state = state; 88 } 89 90 91 static void * eap_aka_init(struct eap_sm *sm) 92 { 93 struct eap_aka_data *data; 94 const char *phase1 = eap_get_config_phase1(sm); 95 struct eap_peer_config *config = eap_get_config(sm); 96 97 data = os_zalloc(sizeof(*data)); 98 if (data == NULL) 99 return NULL; 100 101 data->eap_method = EAP_TYPE_AKA; 102 103 /* Zero is a valid error code, so we need to initialize */ 104 data->error_code = NO_EAP_METHOD_ERROR; 105 106 eap_aka_state(data, CONTINUE); 107 data->prev_id = -1; 108 109 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL; 110 111 data->use_pseudonym = !sm->init_phase2; 112 if (config && config->anonymous_identity && data->use_pseudonym) { 113 data->pseudonym = os_malloc(config->anonymous_identity_len); 114 if (data->pseudonym) { 115 os_memcpy(data->pseudonym, config->anonymous_identity, 116 config->anonymous_identity_len); 117 data->pseudonym_len = config->anonymous_identity_len; 118 } 119 } 120 121 return data; 122 } 123 124 125 #ifdef EAP_AKA_PRIME 126 static void * eap_aka_prime_init(struct eap_sm *sm) 127 { 128 struct eap_aka_data *data = eap_aka_init(sm); 129 if (data == NULL) 130 return NULL; 131 data->eap_method = EAP_TYPE_AKA_PRIME; 132 return data; 133 } 134 #endif /* EAP_AKA_PRIME */ 135 136 137 static void eap_aka_clear_keys(struct eap_aka_data *data, int reauth) 138 { 139 if (!reauth) { 140 os_memset(data->mk, 0, EAP_SIM_MK_LEN); 141 os_memset(data->k_aut, 0, EAP_AKA_PRIME_K_AUT_LEN); 142 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN); 143 os_memset(data->k_re, 0, EAP_AKA_PRIME_K_RE_LEN); 144 } 145 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN); 146 os_memset(data->emsk, 0, EAP_EMSK_LEN); 147 os_memset(data->autn, 0, EAP_AKA_AUTN_LEN); 148 os_memset(data->auts, 0, EAP_AKA_AUTS_LEN); 149 } 150 151 152 static void eap_aka_deinit(struct eap_sm *sm, void *priv) 153 { 154 struct eap_aka_data *data = priv; 155 if (data) { 156 os_free(data->pseudonym); 157 os_free(data->reauth_id); 158 os_free(data->last_eap_identity); 159 wpabuf_free(data->id_msgs); 160 os_free(data->network_name); 161 eap_aka_clear_keys(data, 0); 162 os_free(data); 163 } 164 } 165 166 167 static int eap_aka_ext_sim_req(struct eap_sm *sm, struct eap_aka_data *data) 168 { 169 char req[200], *pos, *end; 170 171 wpa_printf(MSG_DEBUG, "EAP-AKA: Use external USIM processing"); 172 pos = req; 173 end = pos + sizeof(req); 174 pos += os_snprintf(pos, end - pos, "UMTS-AUTH"); 175 pos += os_snprintf(pos, end - pos, ":"); 176 pos += wpa_snprintf_hex(pos, end - pos, data->rand, EAP_AKA_RAND_LEN); 177 pos += os_snprintf(pos, end - pos, ":"); 178 wpa_snprintf_hex(pos, end - pos, data->autn, EAP_AKA_AUTN_LEN); 179 180 eap_sm_request_sim(sm, req); 181 return 1; 182 } 183 184 185 static int eap_aka_ext_sim_result(struct eap_sm *sm, struct eap_aka_data *data, 186 struct eap_peer_config *conf) 187 { 188 char *resp, *pos; 189 190 wpa_printf(MSG_DEBUG, 191 "EAP-AKA: Use result from external USIM processing"); 192 193 resp = conf->external_sim_resp; 194 conf->external_sim_resp = NULL; 195 196 if (os_strncmp(resp, "UMTS-AUTS:", 10) == 0) { 197 pos = resp + 10; 198 if (hexstr2bin(pos, data->auts, EAP_AKA_AUTS_LEN) < 0) 199 goto invalid; 200 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: AUTS", data->auts, 201 EAP_AKA_AUTS_LEN); 202 os_free(resp); 203 return -2; 204 } 205 206 if (os_strncmp(resp, "UMTS-AUTH:", 10) != 0) { 207 wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized external USIM processing response"); 208 os_free(resp); 209 return -1; 210 } 211 212 pos = resp + 10; 213 wpa_hexdump(MSG_DEBUG, "EAP-AKA: RAND", data->rand, EAP_AKA_RAND_LEN); 214 215 if (hexstr2bin(pos, data->ik, EAP_AKA_IK_LEN) < 0) 216 goto invalid; 217 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", data->ik, EAP_AKA_IK_LEN); 218 pos += EAP_AKA_IK_LEN * 2; 219 if (*pos != ':') 220 goto invalid; 221 pos++; 222 223 if (hexstr2bin(pos, data->ck, EAP_AKA_CK_LEN) < 0) 224 goto invalid; 225 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", data->ck, EAP_AKA_CK_LEN); 226 pos += EAP_AKA_CK_LEN * 2; 227 if (*pos != ':') 228 goto invalid; 229 pos++; 230 231 data->res_len = os_strlen(pos) / 2; 232 if (data->res_len > EAP_AKA_RES_MAX_LEN) { 233 data->res_len = 0; 234 goto invalid; 235 } 236 if (hexstr2bin(pos, data->res, data->res_len) < 0) 237 goto invalid; 238 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: RES", data->res, data->res_len); 239 240 os_free(resp); 241 return 0; 242 243 invalid: 244 wpa_printf(MSG_DEBUG, "EAP-AKA: Invalid external USIM processing UMTS-AUTH response"); 245 os_free(resp); 246 return -1; 247 } 248 249 250 static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data) 251 { 252 struct eap_peer_config *conf; 253 254 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm"); 255 256 conf = eap_get_config(sm); 257 if (conf == NULL) 258 return -1; 259 260 if (sm->external_sim) { 261 if (conf->external_sim_resp) 262 return eap_aka_ext_sim_result(sm, data, conf); 263 else 264 return eap_aka_ext_sim_req(sm, data); 265 } 266 267 if (conf->pcsc) { 268 return scard_umts_auth(sm->scard_ctx, data->rand, 269 data->autn, data->res, &data->res_len, 270 data->ik, data->ck, data->auts); 271 } 272 273 #ifdef CONFIG_USIM_SIMULATOR 274 if (conf->password) { 275 u8 opc[16], k[16], sqn[6]; 276 const char *pos; 277 wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage " 278 "implementation for UMTS authentication"); 279 if (conf->password_len < 78) { 280 wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage " 281 "password"); 282 return -1; 283 } 284 pos = (const char *) conf->password; 285 if (hexstr2bin(pos, k, 16)) 286 return -1; 287 pos += 32; 288 if (*pos != ':') 289 return -1; 290 pos++; 291 292 if (hexstr2bin(pos, opc, 16)) 293 return -1; 294 pos += 32; 295 if (*pos != ':') 296 return -1; 297 pos++; 298 299 if (hexstr2bin(pos, sqn, 6)) 300 return -1; 301 302 return milenage_check(opc, k, sqn, data->rand, data->autn, 303 data->ik, data->ck, 304 data->res, &data->res_len, data->auts); 305 } 306 #endif /* CONFIG_USIM_SIMULATOR */ 307 308 #ifdef CONFIG_USIM_HARDCODED 309 wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for " 310 "testing"); 311 312 /* These hardcoded Kc and SRES values are used for testing. 313 * Could consider making them configurable. */ 314 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN); 315 data->res_len = EAP_AKA_RES_MAX_LEN; 316 os_memset(data->ik, '3', EAP_AKA_IK_LEN); 317 os_memset(data->ck, '4', EAP_AKA_CK_LEN); 318 { 319 u8 autn[EAP_AKA_AUTN_LEN]; 320 os_memset(autn, '1', EAP_AKA_AUTN_LEN); 321 if (os_memcmp_const(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) { 322 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match " 323 "with expected value"); 324 return -1; 325 } 326 } 327 #if 0 328 { 329 static int test_resync = 1; 330 if (test_resync) { 331 /* Test Resynchronization */ 332 test_resync = 0; 333 return -2; 334 } 335 } 336 #endif 337 return 0; 338 339 #else /* CONFIG_USIM_HARDCODED */ 340 341 wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorithm " 342 "enabled"); 343 return -1; 344 345 #endif /* CONFIG_USIM_HARDCODED */ 346 } 347 348 349 #define CLEAR_PSEUDONYM 0x01 350 #define CLEAR_REAUTH_ID 0x02 351 #define CLEAR_EAP_ID 0x04 352 353 static void eap_aka_clear_identities(struct eap_sm *sm, 354 struct eap_aka_data *data, int id) 355 { 356 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) { 357 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym"); 358 os_free(data->pseudonym); 359 data->pseudonym = NULL; 360 data->pseudonym_len = 0; 361 if (data->use_pseudonym) 362 eap_set_anon_id(sm, NULL, 0); 363 } 364 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) { 365 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id"); 366 os_free(data->reauth_id); 367 data->reauth_id = NULL; 368 data->reauth_id_len = 0; 369 } 370 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) { 371 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old eap_id"); 372 os_free(data->last_eap_identity); 373 data->last_eap_identity = NULL; 374 data->last_eap_identity_len = 0; 375 } 376 } 377 378 379 static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data, 380 struct eap_sim_attrs *attr) 381 { 382 if (attr->next_pseudonym) { 383 const u8 *identity = NULL; 384 size_t identity_len = 0; 385 const u8 *realm = NULL; 386 size_t realm_len = 0; 387 388 wpa_hexdump_ascii(MSG_DEBUG, 389 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM", 390 attr->next_pseudonym, 391 attr->next_pseudonym_len); 392 os_free(data->pseudonym); 393 /* Look for the realm of the permanent identity */ 394 identity = eap_get_config_identity(sm, &identity_len); 395 if (identity) { 396 for (realm = identity, realm_len = identity_len; 397 realm_len > 0; realm_len--, realm++) { 398 if (*realm == '@') 399 break; 400 } 401 } 402 data->pseudonym = os_malloc(attr->next_pseudonym_len + 403 realm_len); 404 if (data->pseudonym == NULL) { 405 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for " 406 "next pseudonym"); 407 data->pseudonym_len = 0; 408 return -1; 409 } 410 os_memcpy(data->pseudonym, attr->next_pseudonym, 411 attr->next_pseudonym_len); 412 if (realm_len) { 413 os_memcpy(data->pseudonym + attr->next_pseudonym_len, 414 realm, realm_len); 415 } 416 data->pseudonym_len = attr->next_pseudonym_len + realm_len; 417 if (data->use_pseudonym) 418 eap_set_anon_id(sm, data->pseudonym, 419 data->pseudonym_len); 420 } 421 422 if (attr->next_reauth_id) { 423 os_free(data->reauth_id); 424 data->reauth_id = os_memdup(attr->next_reauth_id, 425 attr->next_reauth_id_len); 426 if (data->reauth_id == NULL) { 427 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for " 428 "next reauth_id"); 429 data->reauth_id_len = 0; 430 return -1; 431 } 432 data->reauth_id_len = attr->next_reauth_id_len; 433 wpa_hexdump_ascii(MSG_DEBUG, 434 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID", 435 data->reauth_id, 436 data->reauth_id_len); 437 } 438 439 return 0; 440 } 441 442 443 static int eap_aka_add_id_msg(struct eap_aka_data *data, 444 const struct wpabuf *msg) 445 { 446 if (msg == NULL) 447 return -1; 448 449 if (data->id_msgs == NULL) { 450 data->id_msgs = wpabuf_dup(msg); 451 return data->id_msgs == NULL ? -1 : 0; 452 } 453 454 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0) 455 return -1; 456 wpabuf_put_buf(data->id_msgs, msg); 457 458 return 0; 459 } 460 461 462 static void eap_aka_add_checkcode(struct eap_aka_data *data, 463 struct eap_sim_msg *msg) 464 { 465 const u8 *addr; 466 size_t len; 467 u8 hash[SHA256_MAC_LEN]; 468 469 wpa_printf(MSG_DEBUG, " AT_CHECKCODE"); 470 471 if (data->id_msgs == NULL) { 472 /* 473 * No EAP-AKA/Identity packets were exchanged - send empty 474 * checkcode. 475 */ 476 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0); 477 return; 478 } 479 480 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */ 481 addr = wpabuf_head(data->id_msgs); 482 len = wpabuf_len(data->id_msgs); 483 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len); 484 #ifdef EAP_AKA_PRIME 485 if (data->eap_method == EAP_TYPE_AKA_PRIME) 486 sha256_vector(1, &addr, &len, hash); 487 else 488 #endif /* EAP_AKA_PRIME */ 489 sha1_vector(1, &addr, &len, hash); 490 491 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash, 492 data->eap_method == EAP_TYPE_AKA_PRIME ? 493 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN); 494 } 495 496 497 static int eap_aka_verify_checkcode(struct eap_aka_data *data, 498 const u8 *checkcode, size_t checkcode_len) 499 { 500 const u8 *addr; 501 size_t len; 502 u8 hash[SHA256_MAC_LEN]; 503 size_t hash_len; 504 505 if (checkcode == NULL) 506 return -1; 507 508 if (data->id_msgs == NULL) { 509 if (checkcode_len != 0) { 510 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server " 511 "indicates that AKA/Identity messages were " 512 "used, but they were not"); 513 return -1; 514 } 515 return 0; 516 } 517 518 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ? 519 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN; 520 521 if (checkcode_len != hash_len) { 522 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server " 523 "indicates that AKA/Identity message were not " 524 "used, but they were"); 525 return -1; 526 } 527 528 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */ 529 addr = wpabuf_head(data->id_msgs); 530 len = wpabuf_len(data->id_msgs); 531 #ifdef EAP_AKA_PRIME 532 if (data->eap_method == EAP_TYPE_AKA_PRIME) 533 sha256_vector(1, &addr, &len, hash); 534 else 535 #endif /* EAP_AKA_PRIME */ 536 sha1_vector(1, &addr, &len, hash); 537 538 if (os_memcmp_const(hash, checkcode, hash_len) != 0) { 539 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE"); 540 return -1; 541 } 542 543 return 0; 544 } 545 546 547 static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id, 548 int err) 549 { 550 struct eap_sim_msg *msg; 551 552 eap_aka_state(data, FAILURE); 553 data->num_id_req = 0; 554 data->num_notification = 0; 555 556 wpa_printf(MSG_DEBUG, "EAP-AKA: Send Client-Error (error code %d)", 557 err); 558 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 559 EAP_AKA_SUBTYPE_CLIENT_ERROR); 560 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0); 561 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 562 } 563 564 565 static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data, 566 u8 id) 567 { 568 struct eap_sim_msg *msg; 569 570 eap_aka_state(data, FAILURE); 571 data->num_id_req = 0; 572 data->num_notification = 0; 573 574 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject " 575 "(id=%d)", id); 576 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 577 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT); 578 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 579 } 580 581 582 static struct wpabuf * eap_aka_synchronization_failure( 583 struct eap_aka_data *data, u8 id, struct eap_sim_attrs *attr) 584 { 585 struct eap_sim_msg *msg; 586 587 data->num_id_req = 0; 588 data->num_notification = 0; 589 590 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure " 591 "(id=%d)", id); 592 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 593 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE); 594 wpa_printf(MSG_DEBUG, " AT_AUTS"); 595 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts, 596 EAP_AKA_AUTS_LEN); 597 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 598 size_t i; 599 600 for (i = 0; i < attr->kdf_count; i++) { 601 wpa_printf(MSG_DEBUG, " AT_KDF"); 602 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, attr->kdf[i], 603 NULL, 0); 604 } 605 } 606 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 607 } 608 609 610 static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm, 611 struct eap_aka_data *data, 612 u8 id, 613 enum eap_sim_id_req id_req) 614 { 615 const u8 *identity = NULL; 616 size_t identity_len = 0; 617 struct eap_sim_msg *msg; 618 619 data->reauth = 0; 620 if (id_req == ANY_ID && data->reauth_id) { 621 identity = data->reauth_id; 622 identity_len = data->reauth_id_len; 623 data->reauth = 1; 624 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) && 625 data->pseudonym) { 626 identity = data->pseudonym; 627 identity_len = data->pseudonym_len; 628 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID); 629 } else if (id_req != NO_ID_REQ) { 630 identity = eap_get_config_identity(sm, &identity_len); 631 if (identity) { 632 eap_aka_clear_identities(sm, data, CLEAR_PSEUDONYM | 633 CLEAR_REAUTH_ID); 634 } 635 } 636 if (id_req != NO_ID_REQ) 637 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID); 638 639 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id); 640 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 641 EAP_AKA_SUBTYPE_IDENTITY); 642 643 if (identity) { 644 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY", 645 identity, identity_len); 646 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len, 647 identity, identity_len); 648 } 649 650 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 651 } 652 653 654 static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data, 655 u8 id) 656 { 657 struct eap_sim_msg *msg; 658 659 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id); 660 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 661 EAP_AKA_SUBTYPE_CHALLENGE); 662 wpa_printf(MSG_DEBUG, " AT_RES"); 663 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8, 664 data->res, data->res_len); 665 eap_aka_add_checkcode(data, msg); 666 if (data->use_result_ind) { 667 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 668 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 669 } 670 wpa_printf(MSG_DEBUG, " AT_MAC"); 671 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 672 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, (u8 *) "", 673 0); 674 } 675 676 677 static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data, 678 u8 id, int counter_too_small, 679 const u8 *nonce_s) 680 { 681 struct eap_sim_msg *msg; 682 unsigned int counter; 683 684 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)", 685 id); 686 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 687 EAP_AKA_SUBTYPE_REAUTHENTICATION); 688 wpa_printf(MSG_DEBUG, " AT_IV"); 689 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 690 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); 691 692 if (counter_too_small) { 693 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL"); 694 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0); 695 counter = data->counter_too_small; 696 } else 697 counter = data->counter; 698 699 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter); 700 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0); 701 702 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { 703 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt " 704 "AT_ENCR_DATA"); 705 eap_sim_msg_free(msg); 706 return NULL; 707 } 708 eap_aka_add_checkcode(data, msg); 709 if (data->use_result_ind) { 710 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 711 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 712 } 713 wpa_printf(MSG_DEBUG, " AT_MAC"); 714 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 715 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, nonce_s, 716 EAP_SIM_NONCE_S_LEN); 717 } 718 719 720 static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data, 721 u8 id, u16 notification) 722 { 723 struct eap_sim_msg *msg; 724 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL; 725 726 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id); 727 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 728 EAP_AKA_SUBTYPE_NOTIFICATION); 729 if (k_aut && data->reauth) { 730 wpa_printf(MSG_DEBUG, " AT_IV"); 731 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 732 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, 733 EAP_SIM_AT_ENCR_DATA); 734 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter); 735 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter, 736 NULL, 0); 737 if (eap_sim_msg_add_encr_end(msg, data->k_encr, 738 EAP_SIM_AT_PADDING)) { 739 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt " 740 "AT_ENCR_DATA"); 741 eap_sim_msg_free(msg); 742 return NULL; 743 } 744 } 745 if (k_aut) { 746 wpa_printf(MSG_DEBUG, " AT_MAC"); 747 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 748 } 749 return eap_sim_msg_finish(msg, data->eap_method, k_aut, (u8 *) "", 0); 750 } 751 752 753 static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm, 754 struct eap_aka_data *data, 755 u8 id, 756 const struct wpabuf *reqData, 757 struct eap_sim_attrs *attr) 758 { 759 int id_error; 760 struct wpabuf *buf; 761 762 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity"); 763 764 id_error = 0; 765 switch (attr->id_req) { 766 case NO_ID_REQ: 767 break; 768 case ANY_ID: 769 if (data->num_id_req > 0) 770 id_error++; 771 data->num_id_req++; 772 break; 773 case FULLAUTH_ID: 774 if (data->num_id_req > 1) 775 id_error++; 776 data->num_id_req++; 777 break; 778 case PERMANENT_ID: 779 if (data->num_id_req > 2) 780 id_error++; 781 data->num_id_req++; 782 break; 783 } 784 if (id_error) { 785 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests " 786 "used within one authentication"); 787 return eap_aka_client_error(data, id, 788 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 789 } 790 791 buf = eap_aka_response_identity(sm, data, id, attr->id_req); 792 793 if (data->prev_id != id) { 794 eap_aka_add_id_msg(data, reqData); 795 eap_aka_add_id_msg(data, buf); 796 data->prev_id = id; 797 } 798 799 return buf; 800 } 801 802 803 static int eap_aka_verify_mac(struct eap_aka_data *data, 804 const struct wpabuf *req, 805 const u8 *mac, const u8 *extra, 806 size_t extra_len) 807 { 808 if (data->eap_method == EAP_TYPE_AKA_PRIME) 809 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra, 810 extra_len); 811 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len); 812 } 813 814 815 #ifdef EAP_AKA_PRIME 816 static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data, 817 u8 id, u16 kdf) 818 { 819 struct eap_sim_msg *msg; 820 821 data->kdf_negotiation = 1; 822 data->kdf = kdf; 823 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF " 824 "select)", id); 825 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method, 826 EAP_AKA_SUBTYPE_CHALLENGE); 827 wpa_printf(MSG_DEBUG, " AT_KDF"); 828 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0); 829 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 830 } 831 832 833 static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data, 834 u8 id, struct eap_sim_attrs *attr) 835 { 836 size_t i; 837 838 for (i = 0; i < attr->kdf_count; i++) { 839 if (attr->kdf[i] == EAP_AKA_PRIME_KDF) { 840 os_memcpy(data->last_kdf_attrs, attr->kdf, 841 sizeof(u16) * attr->kdf_count); 842 data->last_kdf_count = attr->kdf_count; 843 return eap_aka_prime_kdf_select(data, id, 844 EAP_AKA_PRIME_KDF); 845 } 846 } 847 848 /* No matching KDF found - fail authentication as if AUTN had been 849 * incorrect */ 850 return eap_aka_authentication_reject(data, id); 851 } 852 853 854 static int eap_aka_prime_kdf_valid(struct eap_aka_data *data, 855 struct eap_sim_attrs *attr) 856 { 857 size_t i, j; 858 859 if (attr->kdf_count == 0) 860 return 0; 861 862 /* The only allowed (and required) duplication of a KDF is the addition 863 * of the selected KDF into the beginning of the list. */ 864 865 if (data->kdf_negotiation) { 866 /* When the peer receives the new EAP-Request/AKA'-Challenge 867 * message, must check only requested change occurred in the 868 * list of AT_KDF attributes. If there are any other changes, 869 * the peer must behave like the case that AT_MAC had been 870 * incorrect and authentication is failed. These are defined in 871 * EAP-AKA' specification RFC 5448, Section 3.2. */ 872 if (attr->kdf[0] != data->kdf) { 873 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not " 874 "accept the selected KDF"); 875 return -1; 876 } 877 878 if (attr->kdf_count > EAP_AKA_PRIME_KDF_MAX || 879 attr->kdf_count != data->last_kdf_count + 1) { 880 wpa_printf(MSG_WARNING, 881 "EAP-AKA': The length of KDF attributes is wrong"); 882 return -1; 883 } 884 885 for (i = 1; i < attr->kdf_count; i++) { 886 if (attr->kdf[i] != data->last_kdf_attrs[i - 1]) { 887 wpa_printf(MSG_WARNING, 888 "EAP-AKA': The KDF attributes except selected KDF are not same as original one"); 889 return -1; 890 } 891 } 892 } 893 894 for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) { 895 for (j = i + 1; j < attr->kdf_count; j++) { 896 if (attr->kdf[i] == attr->kdf[j]) { 897 wpa_printf(MSG_WARNING, "EAP-AKA': The server " 898 "included a duplicated KDF"); 899 return 0; 900 } 901 } 902 } 903 904 return 1; 905 } 906 #endif /* EAP_AKA_PRIME */ 907 908 909 static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm, 910 struct eap_aka_data *data, 911 u8 id, 912 const struct wpabuf *reqData, 913 struct eap_sim_attrs *attr) 914 { 915 const u8 *identity; 916 size_t identity_len; 917 int res; 918 struct eap_sim_attrs eattr; 919 920 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge"); 921 922 if (attr->checkcode && 923 eap_aka_verify_checkcode(data, attr->checkcode, 924 attr->checkcode_len)) { 925 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the " 926 "message"); 927 return eap_aka_client_error(data, id, 928 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 929 } 930 931 #ifdef EAP_AKA_PRIME 932 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 933 if (!attr->kdf_input || attr->kdf_input_len == 0) { 934 wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message " 935 "did not include non-empty AT_KDF_INPUT"); 936 /* Fail authentication as if AUTN had been incorrect */ 937 return eap_aka_authentication_reject(data, id); 938 } 939 os_free(data->network_name); 940 data->network_name = os_memdup(attr->kdf_input, 941 attr->kdf_input_len); 942 if (data->network_name == NULL) { 943 wpa_printf(MSG_WARNING, "EAP-AKA': No memory for " 944 "storing Network Name"); 945 return eap_aka_authentication_reject(data, id); 946 } 947 data->network_name_len = attr->kdf_input_len; 948 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name " 949 "(AT_KDF_INPUT)", 950 data->network_name, data->network_name_len); 951 /* TODO: check Network Name per 3GPP.33.402 */ 952 953 res = eap_aka_prime_kdf_valid(data, attr); 954 if (res == 0) 955 return eap_aka_authentication_reject(data, id); 956 else if (res == -1) 957 return eap_aka_client_error( 958 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET); 959 960 if (attr->kdf[0] != EAP_AKA_PRIME_KDF) 961 return eap_aka_prime_kdf_neg(data, id, attr); 962 963 data->kdf = EAP_AKA_PRIME_KDF; 964 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf); 965 } 966 967 if (data->eap_method == EAP_TYPE_AKA && attr->bidding) { 968 u16 flags = WPA_GET_BE16(attr->bidding); 969 if ((flags & EAP_AKA_BIDDING_FLAG_D) && 970 eap_allowed_method(sm, EAP_VENDOR_IETF, 971 EAP_TYPE_AKA_PRIME)) { 972 wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from " 973 "AKA' to AKA detected"); 974 /* Fail authentication as if AUTN had been incorrect */ 975 return eap_aka_authentication_reject(data, id); 976 } 977 } 978 #endif /* EAP_AKA_PRIME */ 979 980 data->reauth = 0; 981 if (!attr->mac || !attr->rand || !attr->autn) { 982 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message " 983 "did not include%s%s%s", 984 !attr->mac ? " AT_MAC" : "", 985 !attr->rand ? " AT_RAND" : "", 986 !attr->autn ? " AT_AUTN" : ""); 987 return eap_aka_client_error(data, id, 988 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 989 } 990 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN); 991 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN); 992 993 res = eap_aka_umts_auth(sm, data); 994 if (res == -1) { 995 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication " 996 "failed (AUTN)"); 997 return eap_aka_authentication_reject(data, id); 998 } else if (res == -2) { 999 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication " 1000 "failed (AUTN seq# -> AUTS)"); 1001 return eap_aka_synchronization_failure(data, id, attr); 1002 } else if (res > 0) { 1003 wpa_printf(MSG_DEBUG, "EAP-AKA: Wait for external USIM processing"); 1004 return NULL; 1005 } else if (res) { 1006 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed"); 1007 return eap_aka_client_error(data, id, 1008 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1009 } 1010 #ifdef EAP_AKA_PRIME 1011 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 1012 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the 1013 * needed 6-octet SQN ^ AK for CK',IK' derivation */ 1014 u16 amf = WPA_GET_BE16(data->autn + 6); 1015 if (!(amf & 0x8000)) { 1016 wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit " 1017 "not set (AMF=0x%4x)", amf); 1018 return eap_aka_authentication_reject(data, id); 1019 } 1020 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik, 1021 data->autn, 1022 data->network_name, 1023 data->network_name_len); 1024 } 1025 #endif /* EAP_AKA_PRIME */ 1026 if (data->last_eap_identity) { 1027 identity = data->last_eap_identity; 1028 identity_len = data->last_eap_identity_len; 1029 } else if (data->pseudonym) { 1030 identity = data->pseudonym; 1031 identity_len = data->pseudonym_len; 1032 } else { 1033 struct eap_peer_config *config; 1034 1035 config = eap_get_config(sm); 1036 if (config && config->imsi_identity) { 1037 identity = config->imsi_identity; 1038 identity_len = config->imsi_identity_len; 1039 } else { 1040 identity = eap_get_config_identity(sm, &identity_len); 1041 } 1042 } 1043 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK " 1044 "derivation", identity, identity_len); 1045 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 1046 eap_aka_prime_derive_keys(identity, identity_len, data->ik, 1047 data->ck, data->k_encr, data->k_aut, 1048 data->k_re, data->msk, data->emsk); 1049 } else { 1050 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck, 1051 data->mk); 1052 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, 1053 data->msk, data->emsk); 1054 } 1055 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) { 1056 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message " 1057 "used invalid AT_MAC"); 1058 return eap_aka_client_error(data, id, 1059 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1060 } 1061 1062 /* Old reauthentication identity must not be used anymore. In 1063 * other words, if no new identities are received, full 1064 * authentication will be used on next reauthentication (using 1065 * pseudonym identity or permanent identity). */ 1066 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1067 1068 if (attr->encr_data) { 1069 u8 *decrypted; 1070 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 1071 attr->encr_data_len, attr->iv, 1072 &eattr, 0); 1073 if (decrypted == NULL) { 1074 return eap_aka_client_error( 1075 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1076 } 1077 eap_aka_learn_ids(sm, data, &eattr); 1078 os_free(decrypted); 1079 } 1080 1081 if (data->result_ind && attr->result_ind) 1082 data->use_result_ind = 1; 1083 1084 if (data->state != FAILURE) { 1085 eap_aka_state(data, data->use_result_ind ? 1086 RESULT_SUCCESS : SUCCESS); 1087 } 1088 1089 data->num_id_req = 0; 1090 data->num_notification = 0; 1091 /* RFC 4187 specifies that counter is initialized to one after 1092 * fullauth, but initializing it to zero makes it easier to implement 1093 * reauth verification. */ 1094 data->counter = 0; 1095 return eap_aka_response_challenge(data, id); 1096 } 1097 1098 1099 static int eap_aka_process_notification_reauth(struct eap_aka_data *data, 1100 struct eap_sim_attrs *attr) 1101 { 1102 struct eap_sim_attrs eattr; 1103 u8 *decrypted; 1104 1105 if (attr->encr_data == NULL || attr->iv == NULL) { 1106 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after " 1107 "reauth did not include encrypted data"); 1108 return -1; 1109 } 1110 1111 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 1112 attr->encr_data_len, attr->iv, &eattr, 1113 0); 1114 if (decrypted == NULL) { 1115 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted " 1116 "data from notification message"); 1117 return -1; 1118 } 1119 1120 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) { 1121 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification " 1122 "message does not match with counter in reauth " 1123 "message"); 1124 os_free(decrypted); 1125 return -1; 1126 } 1127 1128 os_free(decrypted); 1129 return 0; 1130 } 1131 1132 1133 static int eap_aka_process_notification_auth(struct eap_aka_data *data, 1134 const struct wpabuf *reqData, 1135 struct eap_sim_attrs *attr) 1136 { 1137 if (attr->mac == NULL) { 1138 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth " 1139 "Notification message"); 1140 return -1; 1141 } 1142 1143 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) { 1144 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message " 1145 "used invalid AT_MAC"); 1146 return -1; 1147 } 1148 1149 if (data->reauth && 1150 eap_aka_process_notification_reauth(data, attr)) { 1151 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification " 1152 "message after reauth"); 1153 return -1; 1154 } 1155 1156 return 0; 1157 } 1158 1159 1160 static struct wpabuf * eap_aka_process_notification( 1161 struct eap_sm *sm, struct eap_aka_data *data, u8 id, 1162 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 1163 { 1164 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification"); 1165 if (data->num_notification > 0) { 1166 wpa_printf(MSG_INFO, "EAP-AKA: too many notification " 1167 "rounds (only one allowed)"); 1168 return eap_aka_client_error(data, id, 1169 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1170 } 1171 data->num_notification++; 1172 if (attr->notification == -1) { 1173 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in " 1174 "Notification message"); 1175 return eap_aka_client_error(data, id, 1176 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1177 } 1178 1179 if ((attr->notification & 0x4000) == 0 && 1180 eap_aka_process_notification_auth(data, reqData, attr)) { 1181 return eap_aka_client_error(data, id, 1182 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1183 } 1184 1185 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1); 1186 if (attr->notification >= 0 && attr->notification < 32768) { 1187 data->error_code = attr->notification; 1188 eap_aka_state(data, FAILURE); 1189 } else if (attr->notification == EAP_SIM_SUCCESS && 1190 data->state == RESULT_SUCCESS) 1191 eap_aka_state(data, SUCCESS); 1192 return eap_aka_response_notification(data, id, attr->notification); 1193 } 1194 1195 1196 static struct wpabuf * eap_aka_process_reauthentication( 1197 struct eap_sm *sm, struct eap_aka_data *data, u8 id, 1198 const struct wpabuf *reqData, struct eap_sim_attrs *attr) 1199 { 1200 struct eap_sim_attrs eattr; 1201 u8 *decrypted; 1202 1203 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication"); 1204 1205 if (attr->checkcode && 1206 eap_aka_verify_checkcode(data, attr->checkcode, 1207 attr->checkcode_len)) { 1208 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the " 1209 "message"); 1210 return eap_aka_client_error(data, id, 1211 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1212 } 1213 1214 if (data->reauth_id == NULL) { 1215 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying " 1216 "reauthentication, but no reauth_id available"); 1217 return eap_aka_client_error(data, id, 1218 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1219 } 1220 1221 data->reauth = 1; 1222 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) { 1223 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication " 1224 "did not have valid AT_MAC"); 1225 return eap_aka_client_error(data, id, 1226 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1227 } 1228 1229 if (attr->encr_data == NULL || attr->iv == NULL) { 1230 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication " 1231 "message did not include encrypted data"); 1232 return eap_aka_client_error(data, id, 1233 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1234 } 1235 1236 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 1237 attr->encr_data_len, attr->iv, &eattr, 1238 0); 1239 if (decrypted == NULL) { 1240 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted " 1241 "data from reauthentication message"); 1242 return eap_aka_client_error(data, id, 1243 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1244 } 1245 1246 if (eattr.nonce_s == NULL || eattr.counter < 0) { 1247 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet", 1248 !eattr.nonce_s ? " AT_NONCE_S" : "", 1249 eattr.counter < 0 ? " AT_COUNTER" : ""); 1250 os_free(decrypted); 1251 return eap_aka_client_error(data, id, 1252 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1253 } 1254 1255 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) { 1256 struct wpabuf *res; 1257 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter " 1258 "(%d <= %d)", eattr.counter, data->counter); 1259 data->counter_too_small = eattr.counter; 1260 1261 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current 1262 * reauth_id must not be used to start a new reauthentication. 1263 * However, since it was used in the last EAP-Response-Identity 1264 * packet, it has to saved for the following fullauth to be 1265 * used in MK derivation. */ 1266 os_free(data->last_eap_identity); 1267 data->last_eap_identity = data->reauth_id; 1268 data->last_eap_identity_len = data->reauth_id_len; 1269 data->reauth_id = NULL; 1270 data->reauth_id_len = 0; 1271 1272 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s); 1273 os_free(decrypted); 1274 1275 return res; 1276 } 1277 data->counter = eattr.counter; 1278 1279 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN); 1280 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S", 1281 data->nonce_s, EAP_SIM_NONCE_S_LEN); 1282 1283 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 1284 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter, 1285 data->reauth_id, 1286 data->reauth_id_len, 1287 data->nonce_s, 1288 data->msk, data->emsk); 1289 } else { 1290 eap_sim_derive_keys_reauth(data->counter, data->reauth_id, 1291 data->reauth_id_len, 1292 data->nonce_s, data->mk, 1293 data->msk, data->emsk); 1294 } 1295 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1296 eap_aka_learn_ids(sm, data, &eattr); 1297 1298 if (data->result_ind && attr->result_ind) 1299 data->use_result_ind = 1; 1300 1301 if (data->state != FAILURE) { 1302 eap_aka_state(data, data->use_result_ind ? 1303 RESULT_SUCCESS : SUCCESS); 1304 } 1305 1306 data->num_id_req = 0; 1307 data->num_notification = 0; 1308 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) { 1309 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of " 1310 "fast reauths performed - force fullauth"); 1311 eap_aka_clear_identities(sm, data, 1312 CLEAR_REAUTH_ID | CLEAR_EAP_ID); 1313 } 1314 os_free(decrypted); 1315 return eap_aka_response_reauth(data, id, 0, data->nonce_s); 1316 } 1317 1318 1319 static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv, 1320 struct eap_method_ret *ret, 1321 const struct wpabuf *reqData) 1322 { 1323 struct eap_aka_data *data = priv; 1324 const struct eap_hdr *req; 1325 u8 subtype, id; 1326 struct wpabuf *res; 1327 const u8 *pos; 1328 struct eap_sim_attrs attr; 1329 size_t len; 1330 1331 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData); 1332 if (eap_get_config_identity(sm, &len) == NULL) { 1333 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured"); 1334 eap_sm_request_identity(sm); 1335 ret->ignore = TRUE; 1336 return NULL; 1337 } 1338 1339 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData, 1340 &len); 1341 if (pos == NULL || len < 3) { 1342 ret->ignore = TRUE; 1343 return NULL; 1344 } 1345 req = wpabuf_head(reqData); 1346 id = req->identifier; 1347 len = be_to_host16(req->length); 1348 1349 ret->ignore = FALSE; 1350 ret->methodState = METHOD_MAY_CONT; 1351 ret->decision = DECISION_FAIL; 1352 ret->allowNotifications = TRUE; 1353 1354 subtype = *pos++; 1355 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype); 1356 pos += 2; /* Reserved */ 1357 1358 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 1359 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1, 1360 0)) { 1361 res = eap_aka_client_error(data, id, 1362 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1363 goto done; 1364 } 1365 1366 switch (subtype) { 1367 case EAP_AKA_SUBTYPE_IDENTITY: 1368 res = eap_aka_process_identity(sm, data, id, reqData, &attr); 1369 break; 1370 case EAP_AKA_SUBTYPE_CHALLENGE: 1371 res = eap_aka_process_challenge(sm, data, id, reqData, &attr); 1372 break; 1373 case EAP_AKA_SUBTYPE_NOTIFICATION: 1374 res = eap_aka_process_notification(sm, data, id, reqData, 1375 &attr); 1376 break; 1377 case EAP_AKA_SUBTYPE_REAUTHENTICATION: 1378 res = eap_aka_process_reauthentication(sm, data, id, reqData, 1379 &attr); 1380 break; 1381 case EAP_AKA_SUBTYPE_CLIENT_ERROR: 1382 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error"); 1383 res = eap_aka_client_error(data, id, 1384 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1385 break; 1386 default: 1387 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype); 1388 res = eap_aka_client_error(data, id, 1389 EAP_AKA_UNABLE_TO_PROCESS_PACKET); 1390 break; 1391 } 1392 1393 done: 1394 if (data->state == FAILURE) { 1395 ret->decision = DECISION_FAIL; 1396 ret->methodState = METHOD_DONE; 1397 } else if (data->state == SUCCESS) { 1398 ret->decision = data->use_result_ind ? 1399 DECISION_UNCOND_SUCC : DECISION_COND_SUCC; 1400 /* 1401 * It is possible for the server to reply with AKA 1402 * Notification, so we must allow the method to continue and 1403 * not only accept EAP-Success at this point. 1404 */ 1405 ret->methodState = data->use_result_ind ? 1406 METHOD_DONE : METHOD_MAY_CONT; 1407 } else if (data->state == RESULT_SUCCESS) 1408 ret->methodState = METHOD_CONT; 1409 1410 if (ret->methodState == METHOD_DONE) { 1411 ret->allowNotifications = FALSE; 1412 } 1413 1414 return res; 1415 } 1416 1417 1418 static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv) 1419 { 1420 struct eap_aka_data *data = priv; 1421 return data->pseudonym || data->reauth_id; 1422 } 1423 1424 1425 static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv) 1426 { 1427 struct eap_aka_data *data = priv; 1428 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID); 1429 data->prev_id = -1; 1430 wpabuf_free(data->id_msgs); 1431 data->id_msgs = NULL; 1432 data->use_result_ind = 0; 1433 data->kdf_negotiation = 0; 1434 eap_aka_clear_keys(data, 1); 1435 } 1436 1437 1438 static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv) 1439 { 1440 struct eap_aka_data *data = priv; 1441 data->num_id_req = 0; 1442 data->num_notification = 0; 1443 eap_aka_state(data, CONTINUE); 1444 return priv; 1445 } 1446 1447 1448 static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv, 1449 size_t *len) 1450 { 1451 struct eap_aka_data *data = priv; 1452 1453 if (data->reauth_id) { 1454 *len = data->reauth_id_len; 1455 return data->reauth_id; 1456 } 1457 1458 if (data->pseudonym) { 1459 *len = data->pseudonym_len; 1460 return data->pseudonym; 1461 } 1462 1463 return NULL; 1464 } 1465 1466 1467 static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv) 1468 { 1469 struct eap_aka_data *data = priv; 1470 return data->state == SUCCESS; 1471 } 1472 1473 1474 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len) 1475 { 1476 struct eap_aka_data *data = priv; 1477 u8 *key; 1478 1479 if (data->state != SUCCESS) 1480 return NULL; 1481 1482 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN); 1483 if (key == NULL) 1484 return NULL; 1485 1486 *len = EAP_SIM_KEYING_DATA_LEN; 1487 1488 return key; 1489 } 1490 1491 1492 static u8 * eap_aka_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1493 { 1494 struct eap_aka_data *data = priv; 1495 u8 *id; 1496 1497 if (data->state != SUCCESS) 1498 return NULL; 1499 1500 *len = 1 + EAP_AKA_RAND_LEN + EAP_AKA_AUTN_LEN; 1501 id = os_malloc(*len); 1502 if (id == NULL) 1503 return NULL; 1504 1505 id[0] = data->eap_method; 1506 os_memcpy(id + 1, data->rand, EAP_AKA_RAND_LEN); 1507 os_memcpy(id + 1 + EAP_AKA_RAND_LEN, data->autn, EAP_AKA_AUTN_LEN); 1508 wpa_hexdump(MSG_DEBUG, "EAP-AKA: Derived Session-Id", id, *len); 1509 1510 return id; 1511 } 1512 1513 1514 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1515 { 1516 struct eap_aka_data *data = priv; 1517 u8 *key; 1518 1519 if (data->state != SUCCESS) 1520 return NULL; 1521 1522 key = os_memdup(data->emsk, EAP_EMSK_LEN); 1523 if (key == NULL) 1524 return NULL; 1525 1526 *len = EAP_EMSK_LEN; 1527 1528 return key; 1529 } 1530 1531 static int eap_aka_get_error_code(void *priv) 1532 { 1533 struct eap_aka_data *data = priv; 1534 1535 if (!data) 1536 return NO_EAP_METHOD_ERROR; 1537 1538 int current_data_error = data->error_code; 1539 1540 /* Now reset for next transaction */ 1541 data->error_code = NO_EAP_METHOD_ERROR; 1542 1543 return current_data_error; 1544 } 1545 1546 int eap_peer_aka_register(void) 1547 { 1548 struct eap_method *eap; 1549 1550 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1551 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA"); 1552 if (eap == NULL) 1553 return -1; 1554 1555 eap->init = eap_aka_init; 1556 eap->deinit = eap_aka_deinit; 1557 eap->process = eap_aka_process; 1558 eap->isKeyAvailable = eap_aka_isKeyAvailable; 1559 eap->getKey = eap_aka_getKey; 1560 eap->getSessionId = eap_aka_get_session_id; 1561 eap->has_reauth_data = eap_aka_has_reauth_data; 1562 eap->deinit_for_reauth = eap_aka_deinit_for_reauth; 1563 eap->init_for_reauth = eap_aka_init_for_reauth; 1564 eap->get_identity = eap_aka_get_identity; 1565 eap->get_emsk = eap_aka_get_emsk; 1566 eap->get_error_code = eap_aka_get_error_code; 1567 1568 return eap_peer_method_register(eap); 1569 } 1570 1571 1572 #ifdef EAP_AKA_PRIME 1573 int eap_peer_aka_prime_register(void) 1574 { 1575 struct eap_method *eap; 1576 1577 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1578 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME, 1579 "AKA'"); 1580 if (eap == NULL) 1581 return -1; 1582 1583 eap->init = eap_aka_prime_init; 1584 eap->deinit = eap_aka_deinit; 1585 eap->process = eap_aka_process; 1586 eap->isKeyAvailable = eap_aka_isKeyAvailable; 1587 eap->getKey = eap_aka_getKey; 1588 eap->getSessionId = eap_aka_get_session_id; 1589 eap->has_reauth_data = eap_aka_has_reauth_data; 1590 eap->deinit_for_reauth = eap_aka_deinit_for_reauth; 1591 eap->init_for_reauth = eap_aka_init_for_reauth; 1592 eap->get_identity = eap_aka_get_identity; 1593 eap->get_emsk = eap_aka_get_emsk; 1594 eap->get_error_code = eap_aka_get_error_code; 1595 1596 return eap_peer_method_register(eap); 1597 } 1598 #endif /* EAP_AKA_PRIME */ 1599
