1 /* 2 * EAP-FAST server (RFC 4851) 3 * Copyright (c) 2004-2008, 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/aes_wrap.h" 13 #include "crypto/sha1.h" 14 #include "crypto/tls.h" 15 #include "crypto/random.h" 16 #include "eap_common/eap_tlv_common.h" 17 #include "eap_common/eap_fast_common.h" 18 #include "eap_i.h" 19 #include "eap_tls_common.h" 20 21 22 static void eap_fast_reset(struct eap_sm *sm, void *priv); 23 24 25 /* Private PAC-Opaque TLV types */ 26 #define PAC_OPAQUE_TYPE_PAD 0 27 #define PAC_OPAQUE_TYPE_KEY 1 28 #define PAC_OPAQUE_TYPE_LIFETIME 2 29 #define PAC_OPAQUE_TYPE_IDENTITY 3 30 31 struct eap_fast_data { 32 struct eap_ssl_data ssl; 33 enum { 34 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD, 35 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE 36 } state; 37 38 int fast_version; 39 const struct eap_method *phase2_method; 40 void *phase2_priv; 41 int force_version; 42 int peer_version; 43 44 u8 crypto_binding_nonce[32]; 45 int final_result; 46 47 struct eap_fast_key_block_provisioning *key_block_p; 48 49 u8 simck[EAP_FAST_SIMCK_LEN]; 50 u8 cmk[EAP_FAST_CMK_LEN]; 51 int simck_idx; 52 53 u8 pac_opaque_encr[16]; 54 u8 *srv_id; 55 size_t srv_id_len; 56 char *srv_id_info; 57 58 int anon_provisioning; 59 int send_new_pac; /* server triggered re-keying of Tunnel PAC */ 60 struct wpabuf *pending_phase2_resp; 61 u8 *identity; /* from PAC-Opaque */ 62 size_t identity_len; 63 int eap_seq; 64 int tnc_started; 65 66 int pac_key_lifetime; 67 int pac_key_refresh_time; 68 }; 69 70 71 static int eap_fast_process_phase2_start(struct eap_sm *sm, 72 struct eap_fast_data *data); 73 74 75 static const char * eap_fast_state_txt(int state) 76 { 77 switch (state) { 78 case START: 79 return "START"; 80 case PHASE1: 81 return "PHASE1"; 82 case PHASE2_START: 83 return "PHASE2_START"; 84 case PHASE2_ID: 85 return "PHASE2_ID"; 86 case PHASE2_METHOD: 87 return "PHASE2_METHOD"; 88 case CRYPTO_BINDING: 89 return "CRYPTO_BINDING"; 90 case REQUEST_PAC: 91 return "REQUEST_PAC"; 92 case SUCCESS: 93 return "SUCCESS"; 94 case FAILURE: 95 return "FAILURE"; 96 default: 97 return "Unknown?!"; 98 } 99 } 100 101 102 static void eap_fast_state(struct eap_fast_data *data, int state) 103 { 104 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s", 105 eap_fast_state_txt(data->state), 106 eap_fast_state_txt(state)); 107 data->state = state; 108 } 109 110 111 static EapType eap_fast_req_failure(struct eap_sm *sm, 112 struct eap_fast_data *data) 113 { 114 /* TODO: send Result TLV(FAILURE) */ 115 eap_fast_state(data, FAILURE); 116 return EAP_TYPE_NONE; 117 } 118 119 120 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 121 const u8 *client_random, 122 const u8 *server_random, 123 u8 *master_secret) 124 { 125 struct eap_fast_data *data = ctx; 126 const u8 *pac_opaque; 127 size_t pac_opaque_len; 128 u8 *buf, *pos, *end, *pac_key = NULL; 129 os_time_t lifetime = 0; 130 struct os_time now; 131 u8 *identity = NULL; 132 size_t identity_len = 0; 133 134 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 135 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)", 136 ticket, len); 137 138 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) { 139 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid " 140 "SessionTicket"); 141 return 0; 142 } 143 144 pac_opaque_len = WPA_GET_BE16(ticket + 2); 145 pac_opaque = ticket + 4; 146 if (pac_opaque_len < 8 || pac_opaque_len % 8 || 147 pac_opaque_len > len - 4) { 148 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque " 149 "(len=%lu left=%lu)", 150 (unsigned long) pac_opaque_len, 151 (unsigned long) len); 152 return 0; 153 } 154 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque", 155 pac_opaque, pac_opaque_len); 156 157 buf = os_malloc(pac_opaque_len - 8); 158 if (buf == NULL) { 159 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory " 160 "for decrypting PAC-Opaque"); 161 return 0; 162 } 163 164 if (aes_unwrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr), 165 (pac_opaque_len - 8) / 8, pac_opaque, buf) < 0) { 166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt " 167 "PAC-Opaque"); 168 os_free(buf); 169 /* 170 * This may have been caused by server changing the PAC-Opaque 171 * encryption key, so just ignore this PAC-Opaque instead of 172 * failing the authentication completely. Provisioning can now 173 * be used to provision a new PAC. 174 */ 175 return 0; 176 } 177 178 end = buf + pac_opaque_len - 8; 179 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque", 180 buf, end - buf); 181 182 pos = buf; 183 while (end - pos > 1) { 184 u8 id, elen; 185 186 id = *pos++; 187 elen = *pos++; 188 if (elen > end - pos) 189 break; 190 191 switch (id) { 192 case PAC_OPAQUE_TYPE_PAD: 193 goto done; 194 case PAC_OPAQUE_TYPE_KEY: 195 if (elen != EAP_FAST_PAC_KEY_LEN) { 196 wpa_printf(MSG_DEBUG, 197 "EAP-FAST: Invalid PAC-Key length %d", 198 elen); 199 os_free(buf); 200 return -1; 201 } 202 pac_key = pos; 203 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from " 204 "decrypted PAC-Opaque", 205 pac_key, EAP_FAST_PAC_KEY_LEN); 206 break; 207 case PAC_OPAQUE_TYPE_LIFETIME: 208 if (elen != 4) { 209 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid " 210 "PAC-Key lifetime length %d", 211 elen); 212 os_free(buf); 213 return -1; 214 } 215 lifetime = WPA_GET_BE32(pos); 216 break; 217 case PAC_OPAQUE_TYPE_IDENTITY: 218 identity = pos; 219 identity_len = elen; 220 break; 221 } 222 223 pos += elen; 224 } 225 done: 226 227 if (pac_key == NULL) { 228 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in " 229 "PAC-Opaque"); 230 os_free(buf); 231 return -1; 232 } 233 234 if (identity) { 235 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from " 236 "PAC-Opaque", identity, identity_len); 237 os_free(data->identity); 238 data->identity = os_malloc(identity_len); 239 if (data->identity) { 240 os_memcpy(data->identity, identity, identity_len); 241 data->identity_len = identity_len; 242 } 243 } 244 245 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) { 246 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore " 247 "(lifetime=%ld now=%ld)", lifetime, now.sec); 248 data->send_new_pac = 2; 249 /* 250 * Allow PAC to be used to allow a PAC update with some level 251 * of server authentication (i.e., do not fall back to full TLS 252 * handshake since we cannot be sure that the peer would be 253 * able to validate server certificate now). However, reject 254 * the authentication since the PAC was not valid anymore. Peer 255 * can connect again with the newly provisioned PAC after this. 256 */ 257 } else if (lifetime - now.sec < data->pac_key_refresh_time) { 258 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send " 259 "an update if authentication succeeds"); 260 data->send_new_pac = 1; 261 } 262 263 eap_fast_derive_master_secret(pac_key, server_random, client_random, 264 master_secret); 265 266 os_free(buf); 267 268 return 1; 269 } 270 271 272 static void eap_fast_derive_key_auth(struct eap_sm *sm, 273 struct eap_fast_data *data) 274 { 275 u8 *sks; 276 277 /* RFC 4851, Section 5.1: 278 * Extra key material after TLS key_block: session_key_seed[40] 279 */ 280 281 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 282 EAP_FAST_SKS_LEN); 283 if (sks == NULL) { 284 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 285 "session_key_seed"); 286 return; 287 } 288 289 /* 290 * RFC 4851, Section 5.2: 291 * S-IMCK[0] = session_key_seed 292 */ 293 wpa_hexdump_key(MSG_DEBUG, 294 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 295 sks, EAP_FAST_SKS_LEN); 296 data->simck_idx = 0; 297 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 298 os_free(sks); 299 } 300 301 302 static void eap_fast_derive_key_provisioning(struct eap_sm *sm, 303 struct eap_fast_data *data) 304 { 305 os_free(data->key_block_p); 306 data->key_block_p = (struct eap_fast_key_block_provisioning *) 307 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 308 sizeof(*data->key_block_p)); 309 if (data->key_block_p == NULL) { 310 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 311 return; 312 } 313 /* 314 * RFC 4851, Section 5.2: 315 * S-IMCK[0] = session_key_seed 316 */ 317 wpa_hexdump_key(MSG_DEBUG, 318 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 319 data->key_block_p->session_key_seed, 320 sizeof(data->key_block_p->session_key_seed)); 321 data->simck_idx = 0; 322 os_memcpy(data->simck, data->key_block_p->session_key_seed, 323 EAP_FAST_SIMCK_LEN); 324 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 325 data->key_block_p->server_challenge, 326 sizeof(data->key_block_p->server_challenge)); 327 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 328 data->key_block_p->client_challenge, 329 sizeof(data->key_block_p->client_challenge)); 330 } 331 332 333 static int eap_fast_get_phase2_key(struct eap_sm *sm, 334 struct eap_fast_data *data, 335 u8 *isk, size_t isk_len) 336 { 337 u8 *key; 338 size_t key_len; 339 340 os_memset(isk, 0, isk_len); 341 342 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 343 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 344 "available"); 345 return -1; 346 } 347 348 if (data->phase2_method->getKey == NULL) 349 return 0; 350 351 if ((key = data->phase2_method->getKey(sm, data->phase2_priv, 352 &key_len)) == NULL) { 353 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 354 "from Phase 2"); 355 return -1; 356 } 357 358 if (key_len > isk_len) 359 key_len = isk_len; 360 if (key_len == 32 && 361 data->phase2_method->vendor == EAP_VENDOR_IETF && 362 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 363 /* 364 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 365 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 366 * ISK for EAP-FAST cryptobinding. 367 */ 368 os_memcpy(isk, key + 16, 16); 369 os_memcpy(isk + 16, key, 16); 370 } else 371 os_memcpy(isk, key, key_len); 372 os_free(key); 373 374 return 0; 375 } 376 377 378 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data) 379 { 380 u8 isk[32], imck[60]; 381 382 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)", 383 data->simck_idx + 1); 384 385 /* 386 * RFC 4851, Section 5.2: 387 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 388 * MSK[j], 60) 389 * S-IMCK[j] = first 40 octets of IMCK[j] 390 * CMK[j] = last 20 octets of IMCK[j] 391 */ 392 393 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 394 return -1; 395 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 396 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 397 "Inner Methods Compound Keys", 398 isk, sizeof(isk), imck, sizeof(imck)); 399 data->simck_idx++; 400 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 401 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 402 data->simck, EAP_FAST_SIMCK_LEN); 403 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 404 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 405 data->cmk, EAP_FAST_CMK_LEN); 406 407 return 0; 408 } 409 410 411 static void * eap_fast_init(struct eap_sm *sm) 412 { 413 struct eap_fast_data *data; 414 u8 ciphers[7] = { 415 TLS_CIPHER_ANON_DH_AES128_SHA, 416 TLS_CIPHER_AES128_SHA, 417 TLS_CIPHER_RSA_DHE_AES128_SHA, 418 TLS_CIPHER_RC4_SHA, 419 TLS_CIPHER_RSA_DHE_AES256_SHA, 420 TLS_CIPHER_AES256_SHA, 421 TLS_CIPHER_NONE 422 }; 423 424 data = os_zalloc(sizeof(*data)); 425 if (data == NULL) 426 return NULL; 427 data->fast_version = EAP_FAST_VERSION; 428 data->force_version = -1; 429 if (sm->user && sm->user->force_version >= 0) { 430 data->force_version = sm->user->force_version; 431 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d", 432 data->force_version); 433 data->fast_version = data->force_version; 434 } 435 data->state = START; 436 437 if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_FAST)) { 438 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 439 eap_fast_reset(sm, data); 440 return NULL; 441 } 442 443 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 444 ciphers) < 0) { 445 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher " 446 "suites"); 447 eap_fast_reset(sm, data); 448 return NULL; 449 } 450 451 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 452 eap_fast_session_ticket_cb, 453 data) < 0) { 454 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 455 "callback"); 456 eap_fast_reset(sm, data); 457 return NULL; 458 } 459 460 if (sm->pac_opaque_encr_key == NULL) { 461 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key " 462 "configured"); 463 eap_fast_reset(sm, data); 464 return NULL; 465 } 466 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key, 467 sizeof(data->pac_opaque_encr)); 468 469 if (sm->eap_fast_a_id == NULL) { 470 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured"); 471 eap_fast_reset(sm, data); 472 return NULL; 473 } 474 data->srv_id = os_memdup(sm->eap_fast_a_id, sm->eap_fast_a_id_len); 475 if (data->srv_id == NULL) { 476 eap_fast_reset(sm, data); 477 return NULL; 478 } 479 data->srv_id_len = sm->eap_fast_a_id_len; 480 481 if (sm->eap_fast_a_id_info == NULL) { 482 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured"); 483 eap_fast_reset(sm, data); 484 return NULL; 485 } 486 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info); 487 if (data->srv_id_info == NULL) { 488 eap_fast_reset(sm, data); 489 return NULL; 490 } 491 492 /* PAC-Key lifetime in seconds (hard limit) */ 493 data->pac_key_lifetime = sm->pac_key_lifetime; 494 495 /* 496 * PAC-Key refresh time in seconds (soft limit on remaining hard 497 * limit). The server will generate a new PAC-Key when this number of 498 * seconds (or fewer) of the lifetime remains. 499 */ 500 data->pac_key_refresh_time = sm->pac_key_refresh_time; 501 502 return data; 503 } 504 505 506 static void eap_fast_reset(struct eap_sm *sm, void *priv) 507 { 508 struct eap_fast_data *data = priv; 509 if (data == NULL) 510 return; 511 if (data->phase2_priv && data->phase2_method) 512 data->phase2_method->reset(sm, data->phase2_priv); 513 eap_server_tls_ssl_deinit(sm, &data->ssl); 514 os_free(data->srv_id); 515 os_free(data->srv_id_info); 516 os_free(data->key_block_p); 517 wpabuf_free(data->pending_phase2_resp); 518 os_free(data->identity); 519 bin_clear_free(data, sizeof(*data)); 520 } 521 522 523 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm, 524 struct eap_fast_data *data, u8 id) 525 { 526 struct wpabuf *req; 527 528 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST, 529 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len, 530 EAP_CODE_REQUEST, id); 531 if (req == NULL) { 532 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for" 533 " request"); 534 eap_fast_state(data, FAILURE); 535 return NULL; 536 } 537 538 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version); 539 540 /* RFC 4851, 4.1.1. Authority ID Data */ 541 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len); 542 543 eap_fast_state(data, PHASE1); 544 545 return req; 546 } 547 548 549 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data) 550 { 551 char cipher[64]; 552 553 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2"); 554 555 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher)) 556 < 0) { 557 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher " 558 "information"); 559 eap_fast_state(data, FAILURE); 560 return -1; 561 } 562 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL; 563 564 if (data->anon_provisioning) { 565 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning"); 566 eap_fast_derive_key_provisioning(sm, data); 567 } else 568 eap_fast_derive_key_auth(sm, data); 569 570 eap_fast_state(data, PHASE2_START); 571 572 return 0; 573 } 574 575 576 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm, 577 struct eap_fast_data *data, 578 u8 id) 579 { 580 struct wpabuf *req; 581 582 if (data->phase2_priv == NULL) { 583 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 584 "initialized"); 585 return NULL; 586 } 587 req = data->phase2_method->buildReq(sm, data->phase2_priv, id); 588 if (req == NULL) 589 return NULL; 590 591 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req); 592 return eap_fast_tlv_eap_payload(req); 593 } 594 595 596 static struct wpabuf * eap_fast_build_crypto_binding( 597 struct eap_sm *sm, struct eap_fast_data *data) 598 { 599 struct wpabuf *buf; 600 struct eap_tlv_result_tlv *result; 601 struct eap_tlv_crypto_binding_tlv *binding; 602 603 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding)); 604 if (buf == NULL) 605 return NULL; 606 607 if (data->send_new_pac || data->anon_provisioning || 608 data->phase2_method) 609 data->final_result = 0; 610 else 611 data->final_result = 1; 612 613 if (!data->final_result || data->eap_seq > 1) { 614 /* Intermediate-Result */ 615 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV " 616 "(status=SUCCESS)"); 617 result = wpabuf_put(buf, sizeof(*result)); 618 result->tlv_type = host_to_be16( 619 EAP_TLV_TYPE_MANDATORY | 620 EAP_TLV_INTERMEDIATE_RESULT_TLV); 621 result->length = host_to_be16(2); 622 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS); 623 } 624 625 if (data->final_result) { 626 /* Result TLV */ 627 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV " 628 "(status=SUCCESS)"); 629 result = wpabuf_put(buf, sizeof(*result)); 630 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 631 EAP_TLV_RESULT_TLV); 632 result->length = host_to_be16(2); 633 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS); 634 } 635 636 /* Crypto-Binding TLV */ 637 binding = wpabuf_put(buf, sizeof(*binding)); 638 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 639 EAP_TLV_CRYPTO_BINDING_TLV); 640 binding->length = host_to_be16(sizeof(*binding) - 641 sizeof(struct eap_tlv_hdr)); 642 binding->version = EAP_FAST_VERSION; 643 binding->received_version = data->peer_version; 644 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST; 645 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) { 646 wpabuf_free(buf); 647 return NULL; 648 } 649 650 /* 651 * RFC 4851, Section 4.2.8: 652 * The nonce in a request MUST have its least significant bit set to 0. 653 */ 654 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01; 655 656 os_memcpy(data->crypto_binding_nonce, binding->nonce, 657 sizeof(binding->nonce)); 658 659 /* 660 * RFC 4851, Section 5.3: 661 * CMK = CMK[j] 662 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV ) 663 */ 664 665 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, 666 (u8 *) binding, sizeof(*binding), 667 binding->compound_mac); 668 669 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d " 670 "Received Version %d SubType %d", 671 binding->version, binding->received_version, 672 binding->subtype); 673 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 674 binding->nonce, sizeof(binding->nonce)); 675 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 676 binding->compound_mac, sizeof(binding->compound_mac)); 677 678 return buf; 679 } 680 681 682 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm, 683 struct eap_fast_data *data) 684 { 685 u8 pac_key[EAP_FAST_PAC_KEY_LEN]; 686 u8 *pac_buf, *pac_opaque; 687 struct wpabuf *buf; 688 u8 *pos; 689 size_t buf_len, srv_id_info_len, pac_len; 690 struct eap_tlv_hdr *pac_tlv; 691 struct pac_tlv_hdr *pac_info; 692 struct eap_tlv_result_tlv *result; 693 struct os_time now; 694 695 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 || 696 os_get_time(&now) < 0) 697 return NULL; 698 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key", 699 pac_key, EAP_FAST_PAC_KEY_LEN); 700 701 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) + 702 (2 + sm->identity_len) + 8; 703 pac_buf = os_malloc(pac_len); 704 if (pac_buf == NULL) 705 return NULL; 706 707 srv_id_info_len = os_strlen(data->srv_id_info); 708 709 pos = pac_buf; 710 *pos++ = PAC_OPAQUE_TYPE_KEY; 711 *pos++ = EAP_FAST_PAC_KEY_LEN; 712 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN); 713 pos += EAP_FAST_PAC_KEY_LEN; 714 715 *pos++ = PAC_OPAQUE_TYPE_LIFETIME; 716 *pos++ = 4; 717 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime); 718 pos += 4; 719 720 if (sm->identity) { 721 *pos++ = PAC_OPAQUE_TYPE_IDENTITY; 722 *pos++ = sm->identity_len; 723 os_memcpy(pos, sm->identity, sm->identity_len); 724 pos += sm->identity_len; 725 } 726 727 pac_len = pos - pac_buf; 728 while (pac_len % 8) { 729 *pos++ = PAC_OPAQUE_TYPE_PAD; 730 pac_len++; 731 } 732 733 pac_opaque = os_malloc(pac_len + 8); 734 if (pac_opaque == NULL) { 735 os_free(pac_buf); 736 return NULL; 737 } 738 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr), 739 pac_len / 8, pac_buf, pac_opaque) < 0) { 740 os_free(pac_buf); 741 os_free(pac_opaque); 742 return NULL; 743 } 744 os_free(pac_buf); 745 746 pac_len += 8; 747 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", 748 pac_opaque, pac_len); 749 750 buf_len = sizeof(*pac_tlv) + 751 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN + 752 sizeof(struct pac_tlv_hdr) + pac_len + 753 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result); 754 buf = wpabuf_alloc(buf_len); 755 if (buf == NULL) { 756 os_free(pac_opaque); 757 return NULL; 758 } 759 760 /* Result TLV */ 761 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)"); 762 result = wpabuf_put(buf, sizeof(*result)); 763 WPA_PUT_BE16((u8 *) &result->tlv_type, 764 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV); 765 WPA_PUT_BE16((u8 *) &result->length, 2); 766 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS); 767 768 /* PAC TLV */ 769 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV"); 770 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv)); 771 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 772 EAP_TLV_PAC_TLV); 773 774 /* PAC-Key */ 775 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN); 776 777 /* PAC-Opaque */ 778 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len); 779 os_free(pac_opaque); 780 781 /* PAC-Info */ 782 pac_info = wpabuf_put(buf, sizeof(*pac_info)); 783 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO); 784 785 /* PAC-Lifetime (inside PAC-Info) */ 786 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4); 787 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime); 788 789 /* A-ID (inside PAC-Info) */ 790 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len); 791 792 /* Note: headers may be misaligned after A-ID */ 793 794 if (sm->identity) { 795 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity, 796 sm->identity_len); 797 } 798 799 /* A-ID-Info (inside PAC-Info) */ 800 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info, 801 srv_id_info_len); 802 803 /* PAC-Type (inside PAC-Info) */ 804 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2); 805 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC); 806 807 /* Update PAC-Info and PAC TLV Length fields */ 808 pos = wpabuf_put(buf, 0); 809 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1)); 810 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1)); 811 812 return buf; 813 } 814 815 816 static int eap_fast_encrypt_phase2(struct eap_sm *sm, 817 struct eap_fast_data *data, 818 struct wpabuf *plain, int piggyback) 819 { 820 struct wpabuf *encr; 821 822 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs", 823 plain); 824 encr = eap_server_tls_encrypt(sm, &data->ssl, plain); 825 wpabuf_free(plain); 826 827 if (!encr) 828 return -1; 829 830 if (data->ssl.tls_out && piggyback) { 831 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data " 832 "(len=%d) with last Phase 1 Message (len=%d " 833 "used=%d)", 834 (int) wpabuf_len(encr), 835 (int) wpabuf_len(data->ssl.tls_out), 836 (int) data->ssl.tls_out_pos); 837 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) { 838 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize " 839 "output buffer"); 840 wpabuf_free(encr); 841 return -1; 842 } 843 wpabuf_put_buf(data->ssl.tls_out, encr); 844 wpabuf_free(encr); 845 } else { 846 wpabuf_free(data->ssl.tls_out); 847 data->ssl.tls_out_pos = 0; 848 data->ssl.tls_out = encr; 849 } 850 851 return 0; 852 } 853 854 855 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id) 856 { 857 struct eap_fast_data *data = priv; 858 struct wpabuf *req = NULL; 859 int piggyback = 0; 860 861 if (data->ssl.state == FRAG_ACK) { 862 return eap_server_tls_build_ack(id, EAP_TYPE_FAST, 863 data->fast_version); 864 } 865 866 if (data->ssl.state == WAIT_FRAG_ACK) { 867 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST, 868 data->fast_version, id); 869 } 870 871 switch (data->state) { 872 case START: 873 return eap_fast_build_start(sm, data, id); 874 case PHASE1: 875 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 876 if (eap_fast_phase1_done(sm, data) < 0) 877 return NULL; 878 if (data->state == PHASE2_START) { 879 /* 880 * Try to generate Phase 2 data to piggyback 881 * with the end of Phase 1 to avoid extra 882 * roundtrip. 883 */ 884 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start " 885 "Phase 2"); 886 if (eap_fast_process_phase2_start(sm, data)) 887 break; 888 req = eap_fast_build_phase2_req(sm, data, id); 889 piggyback = 1; 890 } 891 } 892 break; 893 case PHASE2_ID: 894 case PHASE2_METHOD: 895 req = eap_fast_build_phase2_req(sm, data, id); 896 break; 897 case CRYPTO_BINDING: 898 req = eap_fast_build_crypto_binding(sm, data); 899 if (data->phase2_method) { 900 /* 901 * Include the start of the next EAP method in the 902 * sequence in the same message with Crypto-Binding to 903 * save a round-trip. 904 */ 905 struct wpabuf *eap; 906 eap = eap_fast_build_phase2_req(sm, data, id); 907 req = wpabuf_concat(req, eap); 908 eap_fast_state(data, PHASE2_METHOD); 909 } 910 break; 911 case REQUEST_PAC: 912 req = eap_fast_build_pac(sm, data); 913 break; 914 default: 915 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d", 916 __func__, data->state); 917 return NULL; 918 } 919 920 if (req && 921 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0) 922 return NULL; 923 924 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST, 925 data->fast_version, id); 926 } 927 928 929 static Boolean eap_fast_check(struct eap_sm *sm, void *priv, 930 struct wpabuf *respData) 931 { 932 const u8 *pos; 933 size_t len; 934 935 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len); 936 if (pos == NULL || len < 1) { 937 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame"); 938 return TRUE; 939 } 940 941 return FALSE; 942 } 943 944 945 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data, 946 EapType eap_type) 947 { 948 if (data->phase2_priv && data->phase2_method) { 949 data->phase2_method->reset(sm, data->phase2_priv); 950 data->phase2_method = NULL; 951 data->phase2_priv = NULL; 952 } 953 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF, 954 eap_type); 955 if (!data->phase2_method) 956 return -1; 957 958 if (data->key_block_p) { 959 sm->auth_challenge = data->key_block_p->server_challenge; 960 sm->peer_challenge = data->key_block_p->client_challenge; 961 } 962 sm->init_phase2 = 1; 963 data->phase2_priv = data->phase2_method->init(sm); 964 sm->init_phase2 = 0; 965 sm->auth_challenge = NULL; 966 sm->peer_challenge = NULL; 967 968 return data->phase2_priv == NULL ? -1 : 0; 969 } 970 971 972 static void eap_fast_process_phase2_response(struct eap_sm *sm, 973 struct eap_fast_data *data, 974 u8 *in_data, size_t in_len) 975 { 976 u8 next_type = EAP_TYPE_NONE; 977 struct eap_hdr *hdr; 978 u8 *pos; 979 size_t left; 980 struct wpabuf buf; 981 const struct eap_method *m = data->phase2_method; 982 void *priv = data->phase2_priv; 983 984 if (priv == NULL) { 985 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not " 986 "initialized?!", __func__); 987 return; 988 } 989 990 hdr = (struct eap_hdr *) in_data; 991 pos = (u8 *) (hdr + 1); 992 993 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) { 994 left = in_len - sizeof(*hdr); 995 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; " 996 "allowed types", pos + 1, left - 1); 997 #ifdef EAP_SERVER_TNC 998 if (m && m->vendor == EAP_VENDOR_IETF && 999 m->method == EAP_TYPE_TNC) { 1000 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required " 1001 "TNC negotiation"); 1002 next_type = eap_fast_req_failure(sm, data); 1003 eap_fast_phase2_init(sm, data, next_type); 1004 return; 1005 } 1006 #endif /* EAP_SERVER_TNC */ 1007 eap_sm_process_nak(sm, pos + 1, left - 1); 1008 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS && 1009 sm->user->methods[sm->user_eap_method_index].method != 1010 EAP_TYPE_NONE) { 1011 next_type = sm->user->methods[ 1012 sm->user_eap_method_index++].method; 1013 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", 1014 next_type); 1015 } else { 1016 next_type = eap_fast_req_failure(sm, data); 1017 } 1018 eap_fast_phase2_init(sm, data, next_type); 1019 return; 1020 } 1021 1022 wpabuf_set(&buf, in_data, in_len); 1023 1024 if (m->check(sm, priv, &buf)) { 1025 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to " 1026 "ignore the packet"); 1027 eap_fast_req_failure(sm, data); 1028 return; 1029 } 1030 1031 m->process(sm, priv, &buf); 1032 1033 if (!m->isDone(sm, priv)) 1034 return; 1035 1036 if (!m->isSuccess(sm, priv)) { 1037 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed"); 1038 next_type = eap_fast_req_failure(sm, data); 1039 eap_fast_phase2_init(sm, data, next_type); 1040 return; 1041 } 1042 1043 switch (data->state) { 1044 case PHASE2_ID: 1045 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) { 1046 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 " 1047 "Identity not found in the user " 1048 "database", 1049 sm->identity, sm->identity_len); 1050 next_type = eap_fast_req_failure(sm, data); 1051 break; 1052 } 1053 1054 eap_fast_state(data, PHASE2_METHOD); 1055 if (data->anon_provisioning) { 1056 /* 1057 * Only EAP-MSCHAPv2 is allowed for anonymous 1058 * provisioning. 1059 */ 1060 next_type = EAP_TYPE_MSCHAPV2; 1061 sm->user_eap_method_index = 0; 1062 } else { 1063 next_type = sm->user->methods[0].method; 1064 sm->user_eap_method_index = 1; 1065 } 1066 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type); 1067 break; 1068 case PHASE2_METHOD: 1069 case CRYPTO_BINDING: 1070 eap_fast_update_icmk(sm, data); 1071 eap_fast_state(data, CRYPTO_BINDING); 1072 data->eap_seq++; 1073 next_type = EAP_TYPE_NONE; 1074 #ifdef EAP_SERVER_TNC 1075 if (sm->tnc && !data->tnc_started) { 1076 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC"); 1077 next_type = EAP_TYPE_TNC; 1078 data->tnc_started = 1; 1079 } 1080 #endif /* EAP_SERVER_TNC */ 1081 break; 1082 case FAILURE: 1083 break; 1084 default: 1085 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d", 1086 __func__, data->state); 1087 break; 1088 } 1089 1090 eap_fast_phase2_init(sm, data, next_type); 1091 } 1092 1093 1094 static void eap_fast_process_phase2_eap(struct eap_sm *sm, 1095 struct eap_fast_data *data, 1096 u8 *in_data, size_t in_len) 1097 { 1098 struct eap_hdr *hdr; 1099 size_t len; 1100 1101 hdr = (struct eap_hdr *) in_data; 1102 if (in_len < (int) sizeof(*hdr)) { 1103 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1104 "EAP frame (len=%lu)", (unsigned long) in_len); 1105 eap_fast_req_failure(sm, data); 1106 return; 1107 } 1108 len = be_to_host16(hdr->length); 1109 if (len > in_len) { 1110 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in " 1111 "Phase 2 EAP frame (len=%lu hdr->length=%lu)", 1112 (unsigned long) in_len, (unsigned long) len); 1113 eap_fast_req_failure(sm, data); 1114 return; 1115 } 1116 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d " 1117 "identifier=%d length=%lu", hdr->code, hdr->identifier, 1118 (unsigned long) len); 1119 switch (hdr->code) { 1120 case EAP_CODE_RESPONSE: 1121 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len); 1122 break; 1123 default: 1124 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 1125 "Phase 2 EAP header", hdr->code); 1126 break; 1127 } 1128 } 1129 1130 1131 static int eap_fast_parse_tlvs(struct wpabuf *data, 1132 struct eap_fast_tlv_parse *tlv) 1133 { 1134 int mandatory, tlv_type, res; 1135 size_t len; 1136 u8 *pos, *end; 1137 1138 os_memset(tlv, 0, sizeof(*tlv)); 1139 1140 pos = wpabuf_mhead(data); 1141 end = pos + wpabuf_len(data); 1142 while (end - pos > 4) { 1143 mandatory = pos[0] & 0x80; 1144 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1145 pos += 2; 1146 len = WPA_GET_BE16(pos); 1147 pos += 2; 1148 if (len > (size_t) (end - pos)) { 1149 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1150 return -1; 1151 } 1152 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1153 "TLV type %d length %u%s", 1154 tlv_type, (unsigned int) len, 1155 mandatory ? " (mandatory)" : ""); 1156 1157 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1158 if (res == -2) 1159 break; 1160 if (res < 0) { 1161 if (mandatory) { 1162 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1163 "mandatory TLV type %d", tlv_type); 1164 /* TODO: generate Nak TLV */ 1165 break; 1166 } else { 1167 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored " 1168 "unknown optional TLV type %d", 1169 tlv_type); 1170 } 1171 } 1172 1173 pos += len; 1174 } 1175 1176 return 0; 1177 } 1178 1179 1180 static int eap_fast_validate_crypto_binding( 1181 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b, 1182 size_t bind_len) 1183 { 1184 u8 cmac[SHA1_MAC_LEN]; 1185 1186 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: " 1187 "Version %d Received Version %d SubType %d", 1188 b->version, b->received_version, b->subtype); 1189 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 1190 b->nonce, sizeof(b->nonce)); 1191 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 1192 b->compound_mac, sizeof(b->compound_mac)); 1193 1194 if (b->version != EAP_FAST_VERSION || 1195 b->received_version != EAP_FAST_VERSION) { 1196 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version " 1197 "in Crypto-Binding: version %d " 1198 "received_version %d", b->version, 1199 b->received_version); 1200 return -1; 1201 } 1202 1203 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) { 1204 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in " 1205 "Crypto-Binding: %d", b->subtype); 1206 return -1; 1207 } 1208 1209 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 || 1210 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) { 1211 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in " 1212 "Crypto-Binding"); 1213 return -1; 1214 } 1215 1216 os_memcpy(cmac, b->compound_mac, sizeof(cmac)); 1217 os_memset(b->compound_mac, 0, sizeof(cmac)); 1218 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for " 1219 "Compound MAC calculation", 1220 (u8 *) b, bind_len); 1221 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len, 1222 b->compound_mac); 1223 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) { 1224 wpa_hexdump(MSG_MSGDUMP, 1225 "EAP-FAST: Calculated Compound MAC", 1226 b->compound_mac, sizeof(cmac)); 1227 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not " 1228 "match"); 1229 return -1; 1230 } 1231 1232 return 0; 1233 } 1234 1235 1236 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type) 1237 { 1238 struct eap_tlv_pac_type_tlv *tlv; 1239 1240 if (pac == NULL || len != sizeof(*tlv)) 1241 return 0; 1242 1243 tlv = (struct eap_tlv_pac_type_tlv *) pac; 1244 1245 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE && 1246 be_to_host16(tlv->length) == 2 && 1247 be_to_host16(tlv->pac_type) == type; 1248 } 1249 1250 1251 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm, 1252 struct eap_fast_data *data, 1253 struct wpabuf *in_data) 1254 { 1255 struct eap_fast_tlv_parse tlv; 1256 int check_crypto_binding = data->state == CRYPTO_BINDING; 1257 1258 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) { 1259 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received " 1260 "Phase 2 TLVs"); 1261 return; 1262 } 1263 1264 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1265 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated " 1266 "failure"); 1267 eap_fast_state(data, FAILURE); 1268 return; 1269 } 1270 1271 if (data->state == REQUEST_PAC) { 1272 u16 type, len, res; 1273 if (tlv.pac == NULL || tlv.pac_len < 6) { 1274 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC " 1275 "Acknowledgement received"); 1276 eap_fast_state(data, FAILURE); 1277 return; 1278 } 1279 1280 type = WPA_GET_BE16(tlv.pac); 1281 len = WPA_GET_BE16(tlv.pac + 2); 1282 res = WPA_GET_BE16(tlv.pac + 4); 1283 1284 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 || 1285 res != EAP_TLV_RESULT_SUCCESS) { 1286 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not " 1287 "contain acknowledgement"); 1288 eap_fast_state(data, FAILURE); 1289 return; 1290 } 1291 1292 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received " 1293 "- PAC provisioning succeeded"); 1294 eap_fast_state(data, (data->anon_provisioning || 1295 data->send_new_pac == 2) ? 1296 FAILURE : SUCCESS); 1297 return; 1298 } 1299 1300 if (check_crypto_binding) { 1301 if (tlv.crypto_binding == NULL) { 1302 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding " 1303 "TLV received"); 1304 eap_fast_state(data, FAILURE); 1305 return; 1306 } 1307 1308 if (data->final_result && 1309 tlv.result != EAP_TLV_RESULT_SUCCESS) { 1310 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV " 1311 "without Success Result"); 1312 eap_fast_state(data, FAILURE); 1313 return; 1314 } 1315 1316 if (!data->final_result && 1317 tlv.iresult != EAP_TLV_RESULT_SUCCESS) { 1318 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV " 1319 "without intermediate Success Result"); 1320 eap_fast_state(data, FAILURE); 1321 return; 1322 } 1323 1324 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding, 1325 tlv.crypto_binding_len)) { 1326 eap_fast_state(data, FAILURE); 1327 return; 1328 } 1329 1330 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV " 1331 "received"); 1332 if (data->final_result) { 1333 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1334 "completed successfully"); 1335 } 1336 1337 if (data->anon_provisioning && 1338 sm->eap_fast_prov != ANON_PROV && 1339 sm->eap_fast_prov != BOTH_PROV) { 1340 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to " 1341 "use unauthenticated provisioning which is " 1342 "disabled"); 1343 eap_fast_state(data, FAILURE); 1344 return; 1345 } 1346 1347 if (sm->eap_fast_prov != AUTH_PROV && 1348 sm->eap_fast_prov != BOTH_PROV && 1349 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV && 1350 eap_fast_pac_type(tlv.pac, tlv.pac_len, 1351 PAC_TYPE_TUNNEL_PAC)) { 1352 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to " 1353 "use authenticated provisioning which is " 1354 "disabled"); 1355 eap_fast_state(data, FAILURE); 1356 return; 1357 } 1358 1359 if (data->anon_provisioning || 1360 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV && 1361 eap_fast_pac_type(tlv.pac, tlv.pac_len, 1362 PAC_TYPE_TUNNEL_PAC))) { 1363 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new " 1364 "Tunnel PAC"); 1365 eap_fast_state(data, REQUEST_PAC); 1366 } else if (data->send_new_pac) { 1367 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered " 1368 "re-keying of Tunnel PAC"); 1369 eap_fast_state(data, REQUEST_PAC); 1370 } else if (data->final_result) 1371 eap_fast_state(data, SUCCESS); 1372 } 1373 1374 if (tlv.eap_payload_tlv) { 1375 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv, 1376 tlv.eap_payload_tlv_len); 1377 } 1378 } 1379 1380 1381 static void eap_fast_process_phase2(struct eap_sm *sm, 1382 struct eap_fast_data *data, 1383 struct wpabuf *in_buf) 1384 { 1385 struct wpabuf *in_decrypted; 1386 1387 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1388 " Phase 2", (unsigned long) wpabuf_len(in_buf)); 1389 1390 if (data->pending_phase2_resp) { 1391 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - " 1392 "skip decryption and use old data"); 1393 eap_fast_process_phase2_tlvs(sm, data, 1394 data->pending_phase2_resp); 1395 wpabuf_free(data->pending_phase2_resp); 1396 data->pending_phase2_resp = NULL; 1397 return; 1398 } 1399 1400 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn, 1401 in_buf); 1402 if (in_decrypted == NULL) { 1403 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 " 1404 "data"); 1405 eap_fast_state(data, FAILURE); 1406 return; 1407 } 1408 1409 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs", 1410 in_decrypted); 1411 1412 eap_fast_process_phase2_tlvs(sm, data, in_decrypted); 1413 1414 if (sm->method_pending == METHOD_PENDING_WAIT) { 1415 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in " 1416 "pending wait state - save decrypted response"); 1417 wpabuf_free(data->pending_phase2_resp); 1418 data->pending_phase2_resp = in_decrypted; 1419 return; 1420 } 1421 1422 wpabuf_free(in_decrypted); 1423 } 1424 1425 1426 static int eap_fast_process_version(struct eap_sm *sm, void *priv, 1427 int peer_version) 1428 { 1429 struct eap_fast_data *data = priv; 1430 1431 data->peer_version = peer_version; 1432 1433 if (data->force_version >= 0 && peer_version != data->force_version) { 1434 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced" 1435 " version (forced=%d peer=%d) - reject", 1436 data->force_version, peer_version); 1437 return -1; 1438 } 1439 1440 if (peer_version < data->fast_version) { 1441 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; " 1442 "use version %d", 1443 peer_version, data->fast_version, peer_version); 1444 data->fast_version = peer_version; 1445 } 1446 1447 return 0; 1448 } 1449 1450 1451 static int eap_fast_process_phase1(struct eap_sm *sm, 1452 struct eap_fast_data *data) 1453 { 1454 if (eap_server_tls_phase1(sm, &data->ssl) < 0) { 1455 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed"); 1456 eap_fast_state(data, FAILURE); 1457 return -1; 1458 } 1459 1460 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) || 1461 wpabuf_len(data->ssl.tls_out) > 0) 1462 return 1; 1463 1464 /* 1465 * Phase 1 was completed with the received message (e.g., when using 1466 * abbreviated handshake), so Phase 2 can be started immediately 1467 * without having to send through an empty message to the peer. 1468 */ 1469 1470 return eap_fast_phase1_done(sm, data); 1471 } 1472 1473 1474 static int eap_fast_process_phase2_start(struct eap_sm *sm, 1475 struct eap_fast_data *data) 1476 { 1477 u8 next_type; 1478 1479 if (data->identity) { 1480 os_free(sm->identity); 1481 sm->identity = data->identity; 1482 data->identity = NULL; 1483 sm->identity_len = data->identity_len; 1484 data->identity_len = 0; 1485 sm->require_identity_match = 1; 1486 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) { 1487 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: " 1488 "Phase2 Identity not found " 1489 "in the user database", 1490 sm->identity, sm->identity_len); 1491 next_type = eap_fast_req_failure(sm, data); 1492 } else { 1493 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already " 1494 "known - skip Phase 2 Identity Request"); 1495 next_type = sm->user->methods[0].method; 1496 sm->user_eap_method_index = 1; 1497 } 1498 1499 eap_fast_state(data, PHASE2_METHOD); 1500 } else { 1501 eap_fast_state(data, PHASE2_ID); 1502 next_type = EAP_TYPE_IDENTITY; 1503 } 1504 1505 return eap_fast_phase2_init(sm, data, next_type); 1506 } 1507 1508 1509 static void eap_fast_process_msg(struct eap_sm *sm, void *priv, 1510 const struct wpabuf *respData) 1511 { 1512 struct eap_fast_data *data = priv; 1513 1514 switch (data->state) { 1515 case PHASE1: 1516 if (eap_fast_process_phase1(sm, data)) 1517 break; 1518 1519 /* fall through */ 1520 case PHASE2_START: 1521 eap_fast_process_phase2_start(sm, data); 1522 break; 1523 case PHASE2_ID: 1524 case PHASE2_METHOD: 1525 case CRYPTO_BINDING: 1526 case REQUEST_PAC: 1527 eap_fast_process_phase2(sm, data, data->ssl.tls_in); 1528 break; 1529 default: 1530 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s", 1531 data->state, __func__); 1532 break; 1533 } 1534 } 1535 1536 1537 static void eap_fast_process(struct eap_sm *sm, void *priv, 1538 struct wpabuf *respData) 1539 { 1540 struct eap_fast_data *data = priv; 1541 if (eap_server_tls_process(sm, &data->ssl, respData, data, 1542 EAP_TYPE_FAST, eap_fast_process_version, 1543 eap_fast_process_msg) < 0) 1544 eap_fast_state(data, FAILURE); 1545 } 1546 1547 1548 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv) 1549 { 1550 struct eap_fast_data *data = priv; 1551 return data->state == SUCCESS || data->state == FAILURE; 1552 } 1553 1554 1555 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1556 { 1557 struct eap_fast_data *data = priv; 1558 u8 *eapKeyData; 1559 1560 if (data->state != SUCCESS) 1561 return NULL; 1562 1563 eapKeyData = os_malloc(EAP_FAST_KEY_LEN); 1564 if (eapKeyData == NULL) 1565 return NULL; 1566 1567 if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) { 1568 os_free(eapKeyData); 1569 return NULL; 1570 } 1571 *len = EAP_FAST_KEY_LEN; 1572 1573 return eapKeyData; 1574 } 1575 1576 1577 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1578 { 1579 struct eap_fast_data *data = priv; 1580 u8 *eapKeyData; 1581 1582 if (data->state != SUCCESS) 1583 return NULL; 1584 1585 eapKeyData = os_malloc(EAP_EMSK_LEN); 1586 if (eapKeyData == NULL) 1587 return NULL; 1588 1589 if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) { 1590 os_free(eapKeyData); 1591 return NULL; 1592 } 1593 *len = EAP_EMSK_LEN; 1594 1595 return eapKeyData; 1596 } 1597 1598 1599 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv) 1600 { 1601 struct eap_fast_data *data = priv; 1602 return data->state == SUCCESS; 1603 } 1604 1605 1606 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1607 { 1608 struct eap_fast_data *data = priv; 1609 1610 if (data->state != SUCCESS) 1611 return NULL; 1612 1613 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST, 1614 len); 1615 } 1616 1617 1618 int eap_server_fast_register(void) 1619 { 1620 struct eap_method *eap; 1621 1622 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 1623 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1624 if (eap == NULL) 1625 return -1; 1626 1627 eap->init = eap_fast_init; 1628 eap->reset = eap_fast_reset; 1629 eap->buildReq = eap_fast_buildReq; 1630 eap->check = eap_fast_check; 1631 eap->process = eap_fast_process; 1632 eap->isDone = eap_fast_isDone; 1633 eap->getKey = eap_fast_getKey; 1634 eap->get_emsk = eap_fast_get_emsk; 1635 eap->isSuccess = eap_fast_isSuccess; 1636 eap->getSessionId = eap_fast_get_session_id; 1637 1638 return eap_server_method_register(eap); 1639 } 1640
