1 /* 2 * hostapd / EAP-AKA (RFC 4187) and EAP-AKA' (RFC 5448) 3 * Copyright (c) 2005-2012, 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 "crypto/sha256.h" 13 #include "crypto/crypto.h" 14 #include "crypto/random.h" 15 #include "eap_common/eap_sim_common.h" 16 #include "eap_server/eap_i.h" 17 #include "eap_server/eap_sim_db.h" 18 19 20 struct eap_aka_data { 21 u8 mk[EAP_SIM_MK_LEN]; 22 u8 nonce_s[EAP_SIM_NONCE_S_LEN]; 23 u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN]; 24 u8 k_encr[EAP_SIM_K_ENCR_LEN]; 25 u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */ 26 u8 msk[EAP_SIM_KEYING_DATA_LEN]; 27 u8 emsk[EAP_EMSK_LEN]; 28 u8 rand[EAP_AKA_RAND_LEN]; 29 u8 autn[EAP_AKA_AUTN_LEN]; 30 u8 ck[EAP_AKA_CK_LEN]; 31 u8 ik[EAP_AKA_IK_LEN]; 32 u8 res[EAP_AKA_RES_MAX_LEN]; 33 size_t res_len; 34 enum { 35 IDENTITY, CHALLENGE, REAUTH, NOTIFICATION, SUCCESS, FAILURE 36 } state; 37 char *next_pseudonym; 38 char *next_reauth_id; 39 u16 counter; 40 struct eap_sim_reauth *reauth; 41 int auts_reported; /* whether the current AUTS has been reported to the 42 * eap_sim_db */ 43 u16 notification; 44 int use_result_ind; 45 46 struct wpabuf *id_msgs; 47 int pending_id; 48 u8 eap_method; 49 u8 *network_name; 50 size_t network_name_len; 51 u16 kdf; 52 int identity_round; 53 char permanent[20]; /* Permanent username */ 54 }; 55 56 57 static void eap_aka_fullauth(struct eap_sm *sm, struct eap_aka_data *data); 58 59 60 static const char * eap_aka_state_txt(int state) 61 { 62 switch (state) { 63 case IDENTITY: 64 return "IDENTITY"; 65 case CHALLENGE: 66 return "CHALLENGE"; 67 case REAUTH: 68 return "REAUTH"; 69 case SUCCESS: 70 return "SUCCESS"; 71 case FAILURE: 72 return "FAILURE"; 73 case NOTIFICATION: 74 return "NOTIFICATION"; 75 default: 76 return "Unknown?!"; 77 } 78 } 79 80 81 static void eap_aka_state(struct eap_aka_data *data, int state) 82 { 83 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s", 84 eap_aka_state_txt(data->state), 85 eap_aka_state_txt(state)); 86 data->state = state; 87 } 88 89 90 static int eap_aka_check_identity_reauth(struct eap_sm *sm, 91 struct eap_aka_data *data, 92 const char *username) 93 { 94 if (data->eap_method == EAP_TYPE_AKA_PRIME && 95 username[0] != EAP_AKA_PRIME_REAUTH_ID_PREFIX) 96 return 0; 97 if (data->eap_method == EAP_TYPE_AKA && 98 username[0] != EAP_AKA_REAUTH_ID_PREFIX) 99 return 0; 100 101 wpa_printf(MSG_DEBUG, "EAP-AKA: Reauth username '%s'", username); 102 data->reauth = eap_sim_db_get_reauth_entry(sm->eap_sim_db_priv, 103 username); 104 if (data->reauth == NULL) { 105 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown reauth identity - " 106 "request full auth identity"); 107 /* Remain in IDENTITY state for another round */ 108 return 0; 109 } 110 111 wpa_printf(MSG_DEBUG, "EAP-AKA: Using fast re-authentication"); 112 os_strlcpy(data->permanent, data->reauth->permanent, 113 sizeof(data->permanent)); 114 data->counter = data->reauth->counter; 115 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 116 os_memcpy(data->k_encr, data->reauth->k_encr, 117 EAP_SIM_K_ENCR_LEN); 118 os_memcpy(data->k_aut, data->reauth->k_aut, 119 EAP_AKA_PRIME_K_AUT_LEN); 120 os_memcpy(data->k_re, data->reauth->k_re, 121 EAP_AKA_PRIME_K_RE_LEN); 122 } else { 123 os_memcpy(data->mk, data->reauth->mk, EAP_SIM_MK_LEN); 124 } 125 126 eap_aka_state(data, REAUTH); 127 return 1; 128 } 129 130 131 static void eap_aka_check_identity(struct eap_sm *sm, 132 struct eap_aka_data *data) 133 { 134 char *username; 135 136 /* Check if we already know the identity from EAP-Response/Identity */ 137 138 username = sim_get_username(sm->identity, sm->identity_len); 139 if (username == NULL) 140 return; 141 142 if (eap_aka_check_identity_reauth(sm, data, username) > 0) { 143 os_free(username); 144 /* 145 * Since re-auth username was recognized, skip AKA/Identity 146 * exchange. 147 */ 148 return; 149 } 150 151 if ((data->eap_method == EAP_TYPE_AKA_PRIME && 152 username[0] == EAP_AKA_PRIME_PSEUDONYM_PREFIX) || 153 (data->eap_method == EAP_TYPE_AKA && 154 username[0] == EAP_AKA_PSEUDONYM_PREFIX)) { 155 const char *permanent; 156 wpa_printf(MSG_DEBUG, "EAP-AKA: Pseudonym username '%s'", 157 username); 158 permanent = eap_sim_db_get_permanent( 159 sm->eap_sim_db_priv, username); 160 if (permanent == NULL) { 161 os_free(username); 162 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown pseudonym " 163 "identity - request permanent identity"); 164 /* Remain in IDENTITY state for another round */ 165 return; 166 } 167 os_strlcpy(data->permanent, permanent, 168 sizeof(data->permanent)); 169 /* 170 * Since pseudonym username was recognized, skip AKA/Identity 171 * exchange. 172 */ 173 eap_aka_fullauth(sm, data); 174 } 175 176 os_free(username); 177 } 178 179 180 static void * eap_aka_init(struct eap_sm *sm) 181 { 182 struct eap_aka_data *data; 183 184 if (sm->eap_sim_db_priv == NULL) { 185 wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured"); 186 return NULL; 187 } 188 189 data = os_zalloc(sizeof(*data)); 190 if (data == NULL) 191 return NULL; 192 193 data->eap_method = EAP_TYPE_AKA; 194 195 data->state = IDENTITY; 196 data->pending_id = -1; 197 eap_aka_check_identity(sm, data); 198 199 return data; 200 } 201 202 203 #ifdef EAP_SERVER_AKA_PRIME 204 static void * eap_aka_prime_init(struct eap_sm *sm) 205 { 206 struct eap_aka_data *data; 207 /* TODO: make ANID configurable; see 3GPP TS 24.302 */ 208 char *network_name = "WLAN"; 209 210 if (sm->eap_sim_db_priv == NULL) { 211 wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured"); 212 return NULL; 213 } 214 215 data = os_zalloc(sizeof(*data)); 216 if (data == NULL) 217 return NULL; 218 219 data->eap_method = EAP_TYPE_AKA_PRIME; 220 data->network_name = (u8 *) os_strdup(network_name); 221 if (data->network_name == NULL) { 222 os_free(data); 223 return NULL; 224 } 225 226 data->network_name_len = os_strlen(network_name); 227 228 data->state = IDENTITY; 229 data->pending_id = -1; 230 eap_aka_check_identity(sm, data); 231 232 return data; 233 } 234 #endif /* EAP_SERVER_AKA_PRIME */ 235 236 237 static void eap_aka_reset(struct eap_sm *sm, void *priv) 238 { 239 struct eap_aka_data *data = priv; 240 os_free(data->next_pseudonym); 241 os_free(data->next_reauth_id); 242 wpabuf_free(data->id_msgs); 243 os_free(data->network_name); 244 bin_clear_free(data, sizeof(*data)); 245 } 246 247 248 static int eap_aka_add_id_msg(struct eap_aka_data *data, 249 const struct wpabuf *msg) 250 { 251 if (msg == NULL) 252 return -1; 253 254 if (data->id_msgs == NULL) { 255 data->id_msgs = wpabuf_dup(msg); 256 return data->id_msgs == NULL ? -1 : 0; 257 } 258 259 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0) 260 return -1; 261 wpabuf_put_buf(data->id_msgs, msg); 262 263 return 0; 264 } 265 266 267 static void eap_aka_add_checkcode(struct eap_aka_data *data, 268 struct eap_sim_msg *msg) 269 { 270 const u8 *addr; 271 size_t len; 272 u8 hash[SHA256_MAC_LEN]; 273 274 wpa_printf(MSG_DEBUG, " AT_CHECKCODE"); 275 276 if (data->id_msgs == NULL) { 277 /* 278 * No EAP-AKA/Identity packets were exchanged - send empty 279 * checkcode. 280 */ 281 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0); 282 return; 283 } 284 285 /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */ 286 addr = wpabuf_head(data->id_msgs); 287 len = wpabuf_len(data->id_msgs); 288 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len); 289 if (data->eap_method == EAP_TYPE_AKA_PRIME) 290 sha256_vector(1, &addr, &len, hash); 291 else 292 sha1_vector(1, &addr, &len, hash); 293 294 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash, 295 data->eap_method == EAP_TYPE_AKA_PRIME ? 296 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN); 297 } 298 299 300 static int eap_aka_verify_checkcode(struct eap_aka_data *data, 301 const u8 *checkcode, size_t checkcode_len) 302 { 303 const u8 *addr; 304 size_t len; 305 u8 hash[SHA256_MAC_LEN]; 306 size_t hash_len; 307 308 if (checkcode == NULL) 309 return -1; 310 311 if (data->id_msgs == NULL) { 312 if (checkcode_len != 0) { 313 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer " 314 "indicates that AKA/Identity messages were " 315 "used, but they were not"); 316 return -1; 317 } 318 return 0; 319 } 320 321 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ? 322 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN; 323 324 if (checkcode_len != hash_len) { 325 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer indicates " 326 "that AKA/Identity message were not used, but they " 327 "were"); 328 return -1; 329 } 330 331 /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */ 332 addr = wpabuf_head(data->id_msgs); 333 len = wpabuf_len(data->id_msgs); 334 if (data->eap_method == EAP_TYPE_AKA_PRIME) 335 sha256_vector(1, &addr, &len, hash); 336 else 337 sha1_vector(1, &addr, &len, hash); 338 339 if (os_memcmp_const(hash, checkcode, hash_len) != 0) { 340 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE"); 341 return -1; 342 } 343 344 return 0; 345 } 346 347 348 static struct wpabuf * eap_aka_build_identity(struct eap_sm *sm, 349 struct eap_aka_data *data, u8 id) 350 { 351 struct eap_sim_msg *msg; 352 struct wpabuf *buf; 353 354 wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Identity"); 355 msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method, 356 EAP_AKA_SUBTYPE_IDENTITY); 357 data->identity_round++; 358 if (data->identity_round == 1) { 359 /* 360 * RFC 4187, Chap. 4.1.4 recommends that identity from EAP is 361 * ignored and the AKA/Identity is used to request the 362 * identity. 363 */ 364 wpa_printf(MSG_DEBUG, " AT_ANY_ID_REQ"); 365 eap_sim_msg_add(msg, EAP_SIM_AT_ANY_ID_REQ, 0, NULL, 0); 366 } else if (data->identity_round > 3) { 367 /* Cannot use more than three rounds of Identity messages */ 368 eap_sim_msg_free(msg); 369 return NULL; 370 } else if (sm->identity && sm->identity_len > 0 && 371 (sm->identity[0] == EAP_AKA_REAUTH_ID_PREFIX || 372 sm->identity[0] == EAP_AKA_PRIME_REAUTH_ID_PREFIX)) { 373 /* Reauth id may have expired - try fullauth */ 374 wpa_printf(MSG_DEBUG, " AT_FULLAUTH_ID_REQ"); 375 eap_sim_msg_add(msg, EAP_SIM_AT_FULLAUTH_ID_REQ, 0, NULL, 0); 376 } else { 377 wpa_printf(MSG_DEBUG, " AT_PERMANENT_ID_REQ"); 378 eap_sim_msg_add(msg, EAP_SIM_AT_PERMANENT_ID_REQ, 0, NULL, 0); 379 } 380 buf = eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0); 381 if (eap_aka_add_id_msg(data, buf) < 0) { 382 wpabuf_free(buf); 383 return NULL; 384 } 385 data->pending_id = id; 386 return buf; 387 } 388 389 390 static int eap_aka_build_encr(struct eap_sm *sm, struct eap_aka_data *data, 391 struct eap_sim_msg *msg, u16 counter, 392 const u8 *nonce_s) 393 { 394 os_free(data->next_pseudonym); 395 if (nonce_s == NULL) { 396 data->next_pseudonym = 397 eap_sim_db_get_next_pseudonym( 398 sm->eap_sim_db_priv, 399 data->eap_method == EAP_TYPE_AKA_PRIME ? 400 EAP_SIM_DB_AKA_PRIME : EAP_SIM_DB_AKA); 401 } else { 402 /* Do not update pseudonym during re-authentication */ 403 data->next_pseudonym = NULL; 404 } 405 os_free(data->next_reauth_id); 406 if (data->counter <= EAP_AKA_MAX_FAST_REAUTHS) { 407 data->next_reauth_id = 408 eap_sim_db_get_next_reauth_id( 409 sm->eap_sim_db_priv, 410 data->eap_method == EAP_TYPE_AKA_PRIME ? 411 EAP_SIM_DB_AKA_PRIME : EAP_SIM_DB_AKA); 412 } else { 413 wpa_printf(MSG_DEBUG, "EAP-AKA: Max fast re-authentication " 414 "count exceeded - force full authentication"); 415 data->next_reauth_id = NULL; 416 } 417 418 if (data->next_pseudonym == NULL && data->next_reauth_id == NULL && 419 counter == 0 && nonce_s == NULL) 420 return 0; 421 422 wpa_printf(MSG_DEBUG, " AT_IV"); 423 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 424 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); 425 426 if (counter > 0) { 427 wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", counter); 428 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0); 429 } 430 431 if (nonce_s) { 432 wpa_printf(MSG_DEBUG, " *AT_NONCE_S"); 433 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_S, 0, nonce_s, 434 EAP_SIM_NONCE_S_LEN); 435 } 436 437 if (data->next_pseudonym) { 438 wpa_printf(MSG_DEBUG, " *AT_NEXT_PSEUDONYM (%s)", 439 data->next_pseudonym); 440 eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_PSEUDONYM, 441 os_strlen(data->next_pseudonym), 442 (u8 *) data->next_pseudonym, 443 os_strlen(data->next_pseudonym)); 444 } 445 446 if (data->next_reauth_id) { 447 wpa_printf(MSG_DEBUG, " *AT_NEXT_REAUTH_ID (%s)", 448 data->next_reauth_id); 449 eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_REAUTH_ID, 450 os_strlen(data->next_reauth_id), 451 (u8 *) data->next_reauth_id, 452 os_strlen(data->next_reauth_id)); 453 } 454 455 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { 456 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt " 457 "AT_ENCR_DATA"); 458 return -1; 459 } 460 461 return 0; 462 } 463 464 465 static struct wpabuf * eap_aka_build_challenge(struct eap_sm *sm, 466 struct eap_aka_data *data, 467 u8 id) 468 { 469 struct eap_sim_msg *msg; 470 471 wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Challenge"); 472 msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method, 473 EAP_AKA_SUBTYPE_CHALLENGE); 474 wpa_printf(MSG_DEBUG, " AT_RAND"); 475 eap_sim_msg_add(msg, EAP_SIM_AT_RAND, 0, data->rand, EAP_AKA_RAND_LEN); 476 wpa_printf(MSG_DEBUG, " AT_AUTN"); 477 eap_sim_msg_add(msg, EAP_SIM_AT_AUTN, 0, data->autn, EAP_AKA_AUTN_LEN); 478 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 479 if (data->kdf) { 480 /* Add the selected KDF into the beginning */ 481 wpa_printf(MSG_DEBUG, " AT_KDF"); 482 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, data->kdf, 483 NULL, 0); 484 } 485 wpa_printf(MSG_DEBUG, " AT_KDF"); 486 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, EAP_AKA_PRIME_KDF, 487 NULL, 0); 488 wpa_printf(MSG_DEBUG, " AT_KDF_INPUT"); 489 eap_sim_msg_add(msg, EAP_SIM_AT_KDF_INPUT, 490 data->network_name_len, 491 data->network_name, data->network_name_len); 492 } 493 494 if (eap_aka_build_encr(sm, data, msg, 0, NULL)) { 495 eap_sim_msg_free(msg); 496 return NULL; 497 } 498 499 eap_aka_add_checkcode(data, msg); 500 501 if (sm->eap_sim_aka_result_ind) { 502 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 503 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 504 } 505 506 #ifdef EAP_SERVER_AKA_PRIME 507 if (data->eap_method == EAP_TYPE_AKA) { 508 u16 flags = 0; 509 int i; 510 int aka_prime_preferred = 0; 511 512 i = 0; 513 while (sm->user && i < EAP_MAX_METHODS && 514 (sm->user->methods[i].vendor != EAP_VENDOR_IETF || 515 sm->user->methods[i].method != EAP_TYPE_NONE)) { 516 if (sm->user->methods[i].vendor == EAP_VENDOR_IETF) { 517 if (sm->user->methods[i].method == 518 EAP_TYPE_AKA) 519 break; 520 if (sm->user->methods[i].method == 521 EAP_TYPE_AKA_PRIME) { 522 aka_prime_preferred = 1; 523 break; 524 } 525 } 526 i++; 527 } 528 529 if (aka_prime_preferred) 530 flags |= EAP_AKA_BIDDING_FLAG_D; 531 eap_sim_msg_add(msg, EAP_SIM_AT_BIDDING, flags, NULL, 0); 532 } 533 #endif /* EAP_SERVER_AKA_PRIME */ 534 535 wpa_printf(MSG_DEBUG, " AT_MAC"); 536 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 537 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, NULL, 0); 538 } 539 540 541 static struct wpabuf * eap_aka_build_reauth(struct eap_sm *sm, 542 struct eap_aka_data *data, u8 id) 543 { 544 struct eap_sim_msg *msg; 545 546 wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Re-authentication"); 547 548 if (random_get_bytes(data->nonce_s, EAP_SIM_NONCE_S_LEN)) 549 return NULL; 550 wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA: NONCE_S", 551 data->nonce_s, EAP_SIM_NONCE_S_LEN); 552 553 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 554 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter, 555 sm->identity, 556 sm->identity_len, 557 data->nonce_s, 558 data->msk, data->emsk); 559 } else { 560 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, 561 data->msk, data->emsk); 562 eap_sim_derive_keys_reauth(data->counter, sm->identity, 563 sm->identity_len, data->nonce_s, 564 data->mk, data->msk, data->emsk); 565 } 566 567 msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method, 568 EAP_AKA_SUBTYPE_REAUTHENTICATION); 569 570 if (eap_aka_build_encr(sm, data, msg, data->counter, data->nonce_s)) { 571 eap_sim_msg_free(msg); 572 return NULL; 573 } 574 575 eap_aka_add_checkcode(data, msg); 576 577 if (sm->eap_sim_aka_result_ind) { 578 wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); 579 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); 580 } 581 582 wpa_printf(MSG_DEBUG, " AT_MAC"); 583 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 584 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, NULL, 0); 585 } 586 587 588 static struct wpabuf * eap_aka_build_notification(struct eap_sm *sm, 589 struct eap_aka_data *data, 590 u8 id) 591 { 592 struct eap_sim_msg *msg; 593 594 wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Notification"); 595 msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method, 596 EAP_AKA_SUBTYPE_NOTIFICATION); 597 wpa_printf(MSG_DEBUG, " AT_NOTIFICATION (%d)", data->notification); 598 eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, data->notification, 599 NULL, 0); 600 if (data->use_result_ind) { 601 if (data->reauth) { 602 wpa_printf(MSG_DEBUG, " AT_IV"); 603 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); 604 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, 605 EAP_SIM_AT_ENCR_DATA); 606 wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", 607 data->counter); 608 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter, 609 NULL, 0); 610 611 if (eap_sim_msg_add_encr_end(msg, data->k_encr, 612 EAP_SIM_AT_PADDING)) { 613 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to " 614 "encrypt AT_ENCR_DATA"); 615 eap_sim_msg_free(msg); 616 return NULL; 617 } 618 } 619 620 wpa_printf(MSG_DEBUG, " AT_MAC"); 621 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); 622 } 623 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, NULL, 0); 624 } 625 626 627 static struct wpabuf * eap_aka_buildReq(struct eap_sm *sm, void *priv, u8 id) 628 { 629 struct eap_aka_data *data = priv; 630 631 data->auts_reported = 0; 632 switch (data->state) { 633 case IDENTITY: 634 return eap_aka_build_identity(sm, data, id); 635 case CHALLENGE: 636 return eap_aka_build_challenge(sm, data, id); 637 case REAUTH: 638 return eap_aka_build_reauth(sm, data, id); 639 case NOTIFICATION: 640 return eap_aka_build_notification(sm, data, id); 641 default: 642 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in " 643 "buildReq", data->state); 644 break; 645 } 646 return NULL; 647 } 648 649 650 static Boolean eap_aka_check(struct eap_sm *sm, void *priv, 651 struct wpabuf *respData) 652 { 653 struct eap_aka_data *data = priv; 654 const u8 *pos; 655 size_t len; 656 657 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData, 658 &len); 659 if (pos == NULL || len < 3) { 660 wpa_printf(MSG_INFO, "EAP-AKA: Invalid frame"); 661 return TRUE; 662 } 663 664 return FALSE; 665 } 666 667 668 static Boolean eap_aka_subtype_ok(struct eap_aka_data *data, u8 subtype) 669 { 670 if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR || 671 subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT) 672 return FALSE; 673 674 switch (data->state) { 675 case IDENTITY: 676 if (subtype != EAP_AKA_SUBTYPE_IDENTITY) { 677 wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response " 678 "subtype %d", subtype); 679 return TRUE; 680 } 681 break; 682 case CHALLENGE: 683 if (subtype != EAP_AKA_SUBTYPE_CHALLENGE && 684 subtype != EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) { 685 wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response " 686 "subtype %d", subtype); 687 return TRUE; 688 } 689 break; 690 case REAUTH: 691 if (subtype != EAP_AKA_SUBTYPE_REAUTHENTICATION) { 692 wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response " 693 "subtype %d", subtype); 694 return TRUE; 695 } 696 break; 697 case NOTIFICATION: 698 if (subtype != EAP_AKA_SUBTYPE_NOTIFICATION) { 699 wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response " 700 "subtype %d", subtype); 701 return TRUE; 702 } 703 break; 704 default: 705 wpa_printf(MSG_INFO, "EAP-AKA: Unexpected state (%d) for " 706 "processing a response", data->state); 707 return TRUE; 708 } 709 710 return FALSE; 711 } 712 713 714 static void eap_aka_determine_identity(struct eap_sm *sm, 715 struct eap_aka_data *data) 716 { 717 char *username; 718 719 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity", 720 sm->identity, sm->identity_len); 721 722 username = sim_get_username(sm->identity, sm->identity_len); 723 if (username == NULL) { 724 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 725 eap_aka_state(data, NOTIFICATION); 726 return; 727 } 728 729 if (eap_aka_check_identity_reauth(sm, data, username) > 0) { 730 os_free(username); 731 return; 732 } 733 734 if (((data->eap_method == EAP_TYPE_AKA_PRIME && 735 username[0] == EAP_AKA_PRIME_REAUTH_ID_PREFIX) || 736 (data->eap_method == EAP_TYPE_AKA && 737 username[0] == EAP_AKA_REAUTH_ID_PREFIX)) && 738 data->identity_round == 1) { 739 /* Remain in IDENTITY state for another round to request full 740 * auth identity since we did not recognize reauth id */ 741 os_free(username); 742 return; 743 } 744 745 if ((data->eap_method == EAP_TYPE_AKA_PRIME && 746 username[0] == EAP_AKA_PRIME_PSEUDONYM_PREFIX) || 747 (data->eap_method == EAP_TYPE_AKA && 748 username[0] == EAP_AKA_PSEUDONYM_PREFIX)) { 749 const char *permanent; 750 wpa_printf(MSG_DEBUG, "EAP-AKA: Pseudonym username '%s'", 751 username); 752 permanent = eap_sim_db_get_permanent( 753 sm->eap_sim_db_priv, username); 754 os_free(username); 755 if (permanent == NULL) { 756 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown pseudonym " 757 "identity - request permanent identity"); 758 /* Remain in IDENTITY state for another round */ 759 return; 760 } 761 os_strlcpy(data->permanent, permanent, 762 sizeof(data->permanent)); 763 } else if ((data->eap_method == EAP_TYPE_AKA_PRIME && 764 username[0] == EAP_AKA_PRIME_PERMANENT_PREFIX) || 765 (data->eap_method == EAP_TYPE_AKA && 766 username[0] == EAP_AKA_PERMANENT_PREFIX)) { 767 wpa_printf(MSG_DEBUG, "EAP-AKA: Permanent username '%s'", 768 username); 769 os_strlcpy(data->permanent, username, sizeof(data->permanent)); 770 os_free(username); 771 } else { 772 wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized username '%s'", 773 username); 774 os_free(username); 775 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 776 eap_aka_state(data, NOTIFICATION); 777 return; 778 } 779 780 eap_aka_fullauth(sm, data); 781 } 782 783 784 static void eap_aka_fullauth(struct eap_sm *sm, struct eap_aka_data *data) 785 { 786 size_t identity_len; 787 int res; 788 789 res = eap_sim_db_get_aka_auth(sm->eap_sim_db_priv, data->permanent, 790 data->rand, data->autn, data->ik, 791 data->ck, data->res, &data->res_len, sm); 792 if (res == EAP_SIM_DB_PENDING) { 793 wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data " 794 "not yet available - pending request"); 795 sm->method_pending = METHOD_PENDING_WAIT; 796 return; 797 } 798 799 #ifdef EAP_SERVER_AKA_PRIME 800 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 801 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the 802 * needed 6-octet SQN ^AK for CK',IK' derivation */ 803 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik, 804 data->autn, 805 data->network_name, 806 data->network_name_len); 807 } 808 #endif /* EAP_SERVER_AKA_PRIME */ 809 810 data->reauth = NULL; 811 data->counter = 0; /* reset re-auth counter since this is full auth */ 812 813 if (res != 0) { 814 wpa_printf(MSG_INFO, "EAP-AKA: Failed to get AKA " 815 "authentication data for the peer"); 816 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 817 eap_aka_state(data, NOTIFICATION); 818 return; 819 } 820 if (sm->method_pending == METHOD_PENDING_WAIT) { 821 wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data " 822 "available - abort pending wait"); 823 sm->method_pending = METHOD_PENDING_NONE; 824 } 825 826 identity_len = sm->identity_len; 827 while (identity_len > 0 && sm->identity[identity_len - 1] == '\0') { 828 wpa_printf(MSG_DEBUG, "EAP-AKA: Workaround - drop last null " 829 "character from identity"); 830 identity_len--; 831 } 832 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity for MK derivation", 833 sm->identity, identity_len); 834 835 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 836 eap_aka_prime_derive_keys(sm->identity, identity_len, data->ik, 837 data->ck, data->k_encr, data->k_aut, 838 data->k_re, data->msk, data->emsk); 839 } else { 840 eap_aka_derive_mk(sm->identity, identity_len, data->ik, 841 data->ck, data->mk); 842 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, 843 data->msk, data->emsk); 844 } 845 846 eap_aka_state(data, CHALLENGE); 847 } 848 849 850 static void eap_aka_process_identity(struct eap_sm *sm, 851 struct eap_aka_data *data, 852 struct wpabuf *respData, 853 struct eap_sim_attrs *attr) 854 { 855 u8 *new_identity; 856 857 wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Identity"); 858 859 if (attr->mac || attr->iv || attr->encr_data) { 860 wpa_printf(MSG_WARNING, "EAP-AKA: Unexpected attribute " 861 "received in EAP-Response/AKA-Identity"); 862 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 863 eap_aka_state(data, NOTIFICATION); 864 return; 865 } 866 867 /* 868 * We always request identity with AKA/Identity, so the peer is 869 * required to have replied with one. 870 */ 871 if (!attr->identity || attr->identity_len == 0) { 872 wpa_printf(MSG_DEBUG, "EAP-AKA: Peer did not provide any " 873 "identity"); 874 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 875 eap_aka_state(data, NOTIFICATION); 876 return; 877 } 878 879 new_identity = os_malloc(attr->identity_len); 880 if (new_identity == NULL) { 881 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 882 eap_aka_state(data, NOTIFICATION); 883 return; 884 } 885 os_free(sm->identity); 886 sm->identity = new_identity; 887 os_memcpy(sm->identity, attr->identity, attr->identity_len); 888 sm->identity_len = attr->identity_len; 889 890 eap_aka_determine_identity(sm, data); 891 if (eap_get_id(respData) == data->pending_id) { 892 data->pending_id = -1; 893 eap_aka_add_id_msg(data, respData); 894 } 895 } 896 897 898 static int eap_aka_verify_mac(struct eap_aka_data *data, 899 const struct wpabuf *req, 900 const u8 *mac, const u8 *extra, 901 size_t extra_len) 902 { 903 if (data->eap_method == EAP_TYPE_AKA_PRIME) 904 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra, 905 extra_len); 906 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len); 907 } 908 909 910 static void eap_aka_process_challenge(struct eap_sm *sm, 911 struct eap_aka_data *data, 912 struct wpabuf *respData, 913 struct eap_sim_attrs *attr) 914 { 915 wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Challenge"); 916 917 #ifdef EAP_SERVER_AKA_PRIME 918 #if 0 919 /* KDF negotiation; to be enabled only after more than one KDF is 920 * supported */ 921 if (data->eap_method == EAP_TYPE_AKA_PRIME && 922 attr->kdf_count == 1 && attr->mac == NULL) { 923 if (attr->kdf[0] != EAP_AKA_PRIME_KDF) { 924 wpa_printf(MSG_WARNING, "EAP-AKA': Peer selected " 925 "unknown KDF"); 926 data->notification = 927 EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 928 eap_aka_state(data, NOTIFICATION); 929 return; 930 } 931 932 data->kdf = attr->kdf[0]; 933 934 /* Allow negotiation to continue with the selected KDF by 935 * sending another Challenge message */ 936 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf); 937 return; 938 } 939 #endif 940 #endif /* EAP_SERVER_AKA_PRIME */ 941 942 if (attr->checkcode && 943 eap_aka_verify_checkcode(data, attr->checkcode, 944 attr->checkcode_len)) { 945 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the " 946 "message"); 947 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 948 eap_aka_state(data, NOTIFICATION); 949 return; 950 } 951 if (attr->mac == NULL || 952 eap_aka_verify_mac(data, respData, attr->mac, NULL, 0)) { 953 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message " 954 "did not include valid AT_MAC"); 955 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 956 eap_aka_state(data, NOTIFICATION); 957 return; 958 } 959 960 /* 961 * AT_RES is padded, so verify that there is enough room for RES and 962 * that the RES length in bits matches with the expected RES. 963 */ 964 if (attr->res == NULL || attr->res_len < data->res_len || 965 attr->res_len_bits != data->res_len * 8 || 966 os_memcmp_const(attr->res, data->res, data->res_len) != 0) { 967 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message did not " 968 "include valid AT_RES (attr len=%lu, res len=%lu " 969 "bits, expected %lu bits)", 970 (unsigned long) attr->res_len, 971 (unsigned long) attr->res_len_bits, 972 (unsigned long) data->res_len * 8); 973 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 974 eap_aka_state(data, NOTIFICATION); 975 return; 976 } 977 978 wpa_printf(MSG_DEBUG, "EAP-AKA: Challenge response includes the " 979 "correct AT_MAC"); 980 if (sm->eap_sim_aka_result_ind && attr->result_ind) { 981 data->use_result_ind = 1; 982 data->notification = EAP_SIM_SUCCESS; 983 eap_aka_state(data, NOTIFICATION); 984 } else 985 eap_aka_state(data, SUCCESS); 986 987 if (data->next_pseudonym) { 988 eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, data->permanent, 989 data->next_pseudonym); 990 data->next_pseudonym = NULL; 991 } 992 if (data->next_reauth_id) { 993 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 994 #ifdef EAP_SERVER_AKA_PRIME 995 eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv, 996 data->permanent, 997 data->next_reauth_id, 998 data->counter + 1, 999 data->k_encr, data->k_aut, 1000 data->k_re); 1001 #endif /* EAP_SERVER_AKA_PRIME */ 1002 } else { 1003 eap_sim_db_add_reauth(sm->eap_sim_db_priv, 1004 data->permanent, 1005 data->next_reauth_id, 1006 data->counter + 1, 1007 data->mk); 1008 } 1009 data->next_reauth_id = NULL; 1010 } 1011 } 1012 1013 1014 static void eap_aka_process_sync_failure(struct eap_sm *sm, 1015 struct eap_aka_data *data, 1016 struct wpabuf *respData, 1017 struct eap_sim_attrs *attr) 1018 { 1019 wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Synchronization-Failure"); 1020 1021 if (attr->auts == NULL) { 1022 wpa_printf(MSG_WARNING, "EAP-AKA: Synchronization-Failure " 1023 "message did not include valid AT_AUTS"); 1024 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 1025 eap_aka_state(data, NOTIFICATION); 1026 return; 1027 } 1028 1029 /* Avoid re-reporting AUTS when processing pending EAP packet by 1030 * maintaining a local flag stating whether this AUTS has already been 1031 * reported. */ 1032 if (!data->auts_reported && 1033 eap_sim_db_resynchronize(sm->eap_sim_db_priv, data->permanent, 1034 attr->auts, data->rand)) { 1035 wpa_printf(MSG_WARNING, "EAP-AKA: Resynchronization failed"); 1036 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 1037 eap_aka_state(data, NOTIFICATION); 1038 return; 1039 } 1040 data->auts_reported = 1; 1041 1042 /* Remain in CHALLENGE state to re-try after resynchronization */ 1043 eap_aka_fullauth(sm, data); 1044 } 1045 1046 1047 static void eap_aka_process_reauth(struct eap_sm *sm, 1048 struct eap_aka_data *data, 1049 struct wpabuf *respData, 1050 struct eap_sim_attrs *attr) 1051 { 1052 struct eap_sim_attrs eattr; 1053 u8 *decrypted = NULL; 1054 1055 wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Reauthentication"); 1056 1057 if (attr->mac == NULL || 1058 eap_aka_verify_mac(data, respData, attr->mac, data->nonce_s, 1059 EAP_SIM_NONCE_S_LEN)) { 1060 wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message " 1061 "did not include valid AT_MAC"); 1062 goto fail; 1063 } 1064 1065 if (attr->encr_data == NULL || attr->iv == NULL) { 1066 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication " 1067 "message did not include encrypted data"); 1068 goto fail; 1069 } 1070 1071 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, 1072 attr->encr_data_len, attr->iv, &eattr, 1073 0); 1074 if (decrypted == NULL) { 1075 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted " 1076 "data from reauthentication message"); 1077 goto fail; 1078 } 1079 1080 if (eattr.counter != data->counter) { 1081 wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message " 1082 "used incorrect counter %u, expected %u", 1083 eattr.counter, data->counter); 1084 goto fail; 1085 } 1086 os_free(decrypted); 1087 decrypted = NULL; 1088 1089 wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response includes " 1090 "the correct AT_MAC"); 1091 1092 if (eattr.counter_too_small) { 1093 wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response " 1094 "included AT_COUNTER_TOO_SMALL - starting full " 1095 "authentication"); 1096 eap_aka_fullauth(sm, data); 1097 return; 1098 } 1099 1100 if (sm->eap_sim_aka_result_ind && attr->result_ind) { 1101 data->use_result_ind = 1; 1102 data->notification = EAP_SIM_SUCCESS; 1103 eap_aka_state(data, NOTIFICATION); 1104 } else 1105 eap_aka_state(data, SUCCESS); 1106 1107 if (data->next_reauth_id) { 1108 if (data->eap_method == EAP_TYPE_AKA_PRIME) { 1109 #ifdef EAP_SERVER_AKA_PRIME 1110 eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv, 1111 data->permanent, 1112 data->next_reauth_id, 1113 data->counter + 1, 1114 data->k_encr, data->k_aut, 1115 data->k_re); 1116 #endif /* EAP_SERVER_AKA_PRIME */ 1117 } else { 1118 eap_sim_db_add_reauth(sm->eap_sim_db_priv, 1119 data->permanent, 1120 data->next_reauth_id, 1121 data->counter + 1, 1122 data->mk); 1123 } 1124 data->next_reauth_id = NULL; 1125 } else { 1126 eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth); 1127 data->reauth = NULL; 1128 } 1129 1130 return; 1131 1132 fail: 1133 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 1134 eap_aka_state(data, NOTIFICATION); 1135 eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth); 1136 data->reauth = NULL; 1137 os_free(decrypted); 1138 } 1139 1140 1141 static void eap_aka_process_client_error(struct eap_sm *sm, 1142 struct eap_aka_data *data, 1143 struct wpabuf *respData, 1144 struct eap_sim_attrs *attr) 1145 { 1146 wpa_printf(MSG_DEBUG, "EAP-AKA: Client reported error %d", 1147 attr->client_error_code); 1148 if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind) 1149 eap_aka_state(data, SUCCESS); 1150 else 1151 eap_aka_state(data, FAILURE); 1152 } 1153 1154 1155 static void eap_aka_process_authentication_reject( 1156 struct eap_sm *sm, struct eap_aka_data *data, 1157 struct wpabuf *respData, struct eap_sim_attrs *attr) 1158 { 1159 wpa_printf(MSG_DEBUG, "EAP-AKA: Client rejected authentication"); 1160 eap_aka_state(data, FAILURE); 1161 } 1162 1163 1164 static void eap_aka_process_notification(struct eap_sm *sm, 1165 struct eap_aka_data *data, 1166 struct wpabuf *respData, 1167 struct eap_sim_attrs *attr) 1168 { 1169 wpa_printf(MSG_DEBUG, "EAP-AKA: Client replied to notification"); 1170 if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind) 1171 eap_aka_state(data, SUCCESS); 1172 else 1173 eap_aka_state(data, FAILURE); 1174 } 1175 1176 1177 static void eap_aka_process(struct eap_sm *sm, void *priv, 1178 struct wpabuf *respData) 1179 { 1180 struct eap_aka_data *data = priv; 1181 const u8 *pos, *end; 1182 u8 subtype; 1183 size_t len; 1184 struct eap_sim_attrs attr; 1185 1186 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData, 1187 &len); 1188 if (pos == NULL || len < 3) 1189 return; 1190 1191 end = pos + len; 1192 subtype = *pos; 1193 pos += 3; 1194 1195 if (eap_aka_subtype_ok(data, subtype)) { 1196 wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized or unexpected " 1197 "EAP-AKA Subtype in EAP Response"); 1198 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 1199 eap_aka_state(data, NOTIFICATION); 1200 return; 1201 } 1202 1203 if (eap_sim_parse_attr(pos, end, &attr, 1204 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1, 1205 0)) { 1206 wpa_printf(MSG_DEBUG, "EAP-AKA: Failed to parse attributes"); 1207 data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; 1208 eap_aka_state(data, NOTIFICATION); 1209 return; 1210 } 1211 1212 if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR) { 1213 eap_aka_process_client_error(sm, data, respData, &attr); 1214 return; 1215 } 1216 1217 if (subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT) { 1218 eap_aka_process_authentication_reject(sm, data, respData, 1219 &attr); 1220 return; 1221 } 1222 1223 switch (data->state) { 1224 case IDENTITY: 1225 eap_aka_process_identity(sm, data, respData, &attr); 1226 break; 1227 case CHALLENGE: 1228 if (subtype == EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) { 1229 eap_aka_process_sync_failure(sm, data, respData, 1230 &attr); 1231 } else { 1232 eap_aka_process_challenge(sm, data, respData, &attr); 1233 } 1234 break; 1235 case REAUTH: 1236 eap_aka_process_reauth(sm, data, respData, &attr); 1237 break; 1238 case NOTIFICATION: 1239 eap_aka_process_notification(sm, data, respData, &attr); 1240 break; 1241 default: 1242 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in " 1243 "process", data->state); 1244 break; 1245 } 1246 } 1247 1248 1249 static Boolean eap_aka_isDone(struct eap_sm *sm, void *priv) 1250 { 1251 struct eap_aka_data *data = priv; 1252 return data->state == SUCCESS || data->state == FAILURE; 1253 } 1254 1255 1256 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len) 1257 { 1258 struct eap_aka_data *data = priv; 1259 u8 *key; 1260 1261 if (data->state != SUCCESS) 1262 return NULL; 1263 1264 key = os_malloc(EAP_SIM_KEYING_DATA_LEN); 1265 if (key == NULL) 1266 return NULL; 1267 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN); 1268 *len = EAP_SIM_KEYING_DATA_LEN; 1269 return key; 1270 } 1271 1272 1273 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1274 { 1275 struct eap_aka_data *data = priv; 1276 u8 *key; 1277 1278 if (data->state != SUCCESS) 1279 return NULL; 1280 1281 key = os_malloc(EAP_EMSK_LEN); 1282 if (key == NULL) 1283 return NULL; 1284 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1285 *len = EAP_EMSK_LEN; 1286 return key; 1287 } 1288 1289 1290 static Boolean eap_aka_isSuccess(struct eap_sm *sm, void *priv) 1291 { 1292 struct eap_aka_data *data = priv; 1293 return data->state == SUCCESS; 1294 } 1295 1296 1297 int eap_server_aka_register(void) 1298 { 1299 struct eap_method *eap; 1300 int ret; 1301 1302 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 1303 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA"); 1304 if (eap == NULL) 1305 return -1; 1306 1307 eap->init = eap_aka_init; 1308 eap->reset = eap_aka_reset; 1309 eap->buildReq = eap_aka_buildReq; 1310 eap->check = eap_aka_check; 1311 eap->process = eap_aka_process; 1312 eap->isDone = eap_aka_isDone; 1313 eap->getKey = eap_aka_getKey; 1314 eap->isSuccess = eap_aka_isSuccess; 1315 eap->get_emsk = eap_aka_get_emsk; 1316 1317 ret = eap_server_method_register(eap); 1318 if (ret) 1319 eap_server_method_free(eap); 1320 return ret; 1321 } 1322 1323 1324 #ifdef EAP_SERVER_AKA_PRIME 1325 int eap_server_aka_prime_register(void) 1326 { 1327 struct eap_method *eap; 1328 int ret; 1329 1330 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 1331 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME, 1332 "AKA'"); 1333 if (eap == NULL) 1334 return -1; 1335 1336 eap->init = eap_aka_prime_init; 1337 eap->reset = eap_aka_reset; 1338 eap->buildReq = eap_aka_buildReq; 1339 eap->check = eap_aka_check; 1340 eap->process = eap_aka_process; 1341 eap->isDone = eap_aka_isDone; 1342 eap->getKey = eap_aka_getKey; 1343 eap->isSuccess = eap_aka_isSuccess; 1344 eap->get_emsk = eap_aka_get_emsk; 1345 1346 ret = eap_server_method_register(eap); 1347 if (ret) 1348 eap_server_method_free(eap); 1349 1350 return ret; 1351 } 1352 #endif /* EAP_SERVER_AKA_PRIME */ 1353
