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_malloc(sm->eap_fast_a_id_len); 475 if (data->srv_id == NULL) { 476 eap_fast_reset(sm, data); 477 return NULL; 478 } 479 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len); 480 data->srv_id_len = sm->eap_fast_a_id_len; 481 482 if (sm->eap_fast_a_id_info == NULL) { 483 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured"); 484 eap_fast_reset(sm, data); 485 return NULL; 486 } 487 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info); 488 if (data->srv_id_info == NULL) { 489 eap_fast_reset(sm, data); 490 return NULL; 491 } 492 493 /* PAC-Key lifetime in seconds (hard limit) */ 494 data->pac_key_lifetime = sm->pac_key_lifetime; 495 496 /* 497 * PAC-Key refresh time in seconds (soft limit on remaining hard 498 * limit). The server will generate a new PAC-Key when this number of 499 * seconds (or fewer) of the lifetime remains. 500 */ 501 data->pac_key_refresh_time = sm->pac_key_refresh_time; 502 503 return data; 504 } 505 506 507 static void eap_fast_reset(struct eap_sm *sm, void *priv) 508 { 509 struct eap_fast_data *data = priv; 510 if (data == NULL) 511 return; 512 if (data->phase2_priv && data->phase2_method) 513 data->phase2_method->reset(sm, data->phase2_priv); 514 eap_server_tls_ssl_deinit(sm, &data->ssl); 515 os_free(data->srv_id); 516 os_free(data->srv_id_info); 517 os_free(data->key_block_p); 518 wpabuf_free(data->pending_phase2_resp); 519 os_free(data->identity); 520 bin_clear_free(data, sizeof(*data)); 521 } 522 523 524 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm, 525 struct eap_fast_data *data, u8 id) 526 { 527 struct wpabuf *req; 528 529 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST, 530 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len, 531 EAP_CODE_REQUEST, id); 532 if (req == NULL) { 533 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for" 534 " request"); 535 eap_fast_state(data, FAILURE); 536 return NULL; 537 } 538 539 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version); 540 541 /* RFC 4851, 4.1.1. Authority ID Data */ 542 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len); 543 544 eap_fast_state(data, PHASE1); 545 546 return req; 547 } 548 549 550 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data) 551 { 552 char cipher[64]; 553 554 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2"); 555 556 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher)) 557 < 0) { 558 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher " 559 "information"); 560 eap_fast_state(data, FAILURE); 561 return -1; 562 } 563 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL; 564 565 if (data->anon_provisioning) { 566 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning"); 567 eap_fast_derive_key_provisioning(sm, data); 568 } else 569 eap_fast_derive_key_auth(sm, data); 570 571 eap_fast_state(data, PHASE2_START); 572 573 return 0; 574 } 575 576 577 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm, 578 struct eap_fast_data *data, 579 u8 id) 580 { 581 struct wpabuf *req; 582 583 if (data->phase2_priv == NULL) { 584 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 585 "initialized"); 586 return NULL; 587 } 588 req = data->phase2_method->buildReq(sm, data->phase2_priv, id); 589 if (req == NULL) 590 return NULL; 591 592 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req); 593 return eap_fast_tlv_eap_payload(req); 594 } 595 596 597 static struct wpabuf * eap_fast_build_crypto_binding( 598 struct eap_sm *sm, struct eap_fast_data *data) 599 { 600 struct wpabuf *buf; 601 struct eap_tlv_result_tlv *result; 602 struct eap_tlv_crypto_binding_tlv *binding; 603 604 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding)); 605 if (buf == NULL) 606 return NULL; 607 608 if (data->send_new_pac || data->anon_provisioning || 609 data->phase2_method) 610 data->final_result = 0; 611 else 612 data->final_result = 1; 613 614 if (!data->final_result || data->eap_seq > 1) { 615 /* Intermediate-Result */ 616 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV " 617 "(status=SUCCESS)"); 618 result = wpabuf_put(buf, sizeof(*result)); 619 result->tlv_type = host_to_be16( 620 EAP_TLV_TYPE_MANDATORY | 621 EAP_TLV_INTERMEDIATE_RESULT_TLV); 622 result->length = host_to_be16(2); 623 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS); 624 } 625 626 if (data->final_result) { 627 /* Result TLV */ 628 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV " 629 "(status=SUCCESS)"); 630 result = wpabuf_put(buf, sizeof(*result)); 631 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 632 EAP_TLV_RESULT_TLV); 633 result->length = host_to_be16(2); 634 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS); 635 } 636 637 /* Crypto-Binding TLV */ 638 binding = wpabuf_put(buf, sizeof(*binding)); 639 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 640 EAP_TLV_CRYPTO_BINDING_TLV); 641 binding->length = host_to_be16(sizeof(*binding) - 642 sizeof(struct eap_tlv_hdr)); 643 binding->version = EAP_FAST_VERSION; 644 binding->received_version = data->peer_version; 645 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST; 646 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) { 647 wpabuf_free(buf); 648 return NULL; 649 } 650 651 /* 652 * RFC 4851, Section 4.2.8: 653 * The nonce in a request MUST have its least significant bit set to 0. 654 */ 655 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01; 656 657 os_memcpy(data->crypto_binding_nonce, binding->nonce, 658 sizeof(binding->nonce)); 659 660 /* 661 * RFC 4851, Section 5.3: 662 * CMK = CMK[j] 663 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV ) 664 */ 665 666 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, 667 (u8 *) binding, sizeof(*binding), 668 binding->compound_mac); 669 670 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d " 671 "Received Version %d SubType %d", 672 binding->version, binding->received_version, 673 binding->subtype); 674 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 675 binding->nonce, sizeof(binding->nonce)); 676 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 677 binding->compound_mac, sizeof(binding->compound_mac)); 678 679 return buf; 680 } 681 682 683 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm, 684 struct eap_fast_data *data) 685 { 686 u8 pac_key[EAP_FAST_PAC_KEY_LEN]; 687 u8 *pac_buf, *pac_opaque; 688 struct wpabuf *buf; 689 u8 *pos; 690 size_t buf_len, srv_id_info_len, pac_len; 691 struct eap_tlv_hdr *pac_tlv; 692 struct pac_tlv_hdr *pac_info; 693 struct eap_tlv_result_tlv *result; 694 struct os_time now; 695 696 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 || 697 os_get_time(&now) < 0) 698 return NULL; 699 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key", 700 pac_key, EAP_FAST_PAC_KEY_LEN); 701 702 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) + 703 (2 + sm->identity_len) + 8; 704 pac_buf = os_malloc(pac_len); 705 if (pac_buf == NULL) 706 return NULL; 707 708 srv_id_info_len = os_strlen(data->srv_id_info); 709 710 pos = pac_buf; 711 *pos++ = PAC_OPAQUE_TYPE_KEY; 712 *pos++ = EAP_FAST_PAC_KEY_LEN; 713 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN); 714 pos += EAP_FAST_PAC_KEY_LEN; 715 716 *pos++ = PAC_OPAQUE_TYPE_LIFETIME; 717 *pos++ = 4; 718 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime); 719 pos += 4; 720 721 if (sm->identity) { 722 *pos++ = PAC_OPAQUE_TYPE_IDENTITY; 723 *pos++ = sm->identity_len; 724 os_memcpy(pos, sm->identity, sm->identity_len); 725 pos += sm->identity_len; 726 } 727 728 pac_len = pos - pac_buf; 729 while (pac_len % 8) { 730 *pos++ = PAC_OPAQUE_TYPE_PAD; 731 pac_len++; 732 } 733 734 pac_opaque = os_malloc(pac_len + 8); 735 if (pac_opaque == NULL) { 736 os_free(pac_buf); 737 return NULL; 738 } 739 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr), 740 pac_len / 8, pac_buf, pac_opaque) < 0) { 741 os_free(pac_buf); 742 os_free(pac_opaque); 743 return NULL; 744 } 745 os_free(pac_buf); 746 747 pac_len += 8; 748 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", 749 pac_opaque, pac_len); 750 751 buf_len = sizeof(*pac_tlv) + 752 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN + 753 sizeof(struct pac_tlv_hdr) + pac_len + 754 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result); 755 buf = wpabuf_alloc(buf_len); 756 if (buf == NULL) { 757 os_free(pac_opaque); 758 return NULL; 759 } 760 761 /* Result TLV */ 762 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)"); 763 result = wpabuf_put(buf, sizeof(*result)); 764 WPA_PUT_BE16((u8 *) &result->tlv_type, 765 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV); 766 WPA_PUT_BE16((u8 *) &result->length, 2); 767 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS); 768 769 /* PAC TLV */ 770 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV"); 771 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv)); 772 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 773 EAP_TLV_PAC_TLV); 774 775 /* PAC-Key */ 776 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN); 777 778 /* PAC-Opaque */ 779 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len); 780 os_free(pac_opaque); 781 782 /* PAC-Info */ 783 pac_info = wpabuf_put(buf, sizeof(*pac_info)); 784 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO); 785 786 /* PAC-Lifetime (inside PAC-Info) */ 787 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4); 788 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime); 789 790 /* A-ID (inside PAC-Info) */ 791 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len); 792 793 /* Note: headers may be misaligned after A-ID */ 794 795 if (sm->identity) { 796 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity, 797 sm->identity_len); 798 } 799 800 /* A-ID-Info (inside PAC-Info) */ 801 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info, 802 srv_id_info_len); 803 804 /* PAC-Type (inside PAC-Info) */ 805 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2); 806 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC); 807 808 /* Update PAC-Info and PAC TLV Length fields */ 809 pos = wpabuf_put(buf, 0); 810 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1)); 811 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1)); 812 813 return buf; 814 } 815 816 817 static int eap_fast_encrypt_phase2(struct eap_sm *sm, 818 struct eap_fast_data *data, 819 struct wpabuf *plain, int piggyback) 820 { 821 struct wpabuf *encr; 822 823 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs", 824 plain); 825 encr = eap_server_tls_encrypt(sm, &data->ssl, plain); 826 wpabuf_free(plain); 827 828 if (!encr) 829 return -1; 830 831 if (data->ssl.tls_out && piggyback) { 832 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data " 833 "(len=%d) with last Phase 1 Message (len=%d " 834 "used=%d)", 835 (int) wpabuf_len(encr), 836 (int) wpabuf_len(data->ssl.tls_out), 837 (int) data->ssl.tls_out_pos); 838 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) { 839 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize " 840 "output buffer"); 841 wpabuf_free(encr); 842 return -1; 843 } 844 wpabuf_put_buf(data->ssl.tls_out, encr); 845 wpabuf_free(encr); 846 } else { 847 wpabuf_free(data->ssl.tls_out); 848 data->ssl.tls_out_pos = 0; 849 data->ssl.tls_out = encr; 850 } 851 852 return 0; 853 } 854 855 856 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id) 857 { 858 struct eap_fast_data *data = priv; 859 struct wpabuf *req = NULL; 860 int piggyback = 0; 861 862 if (data->ssl.state == FRAG_ACK) { 863 return eap_server_tls_build_ack(id, EAP_TYPE_FAST, 864 data->fast_version); 865 } 866 867 if (data->ssl.state == WAIT_FRAG_ACK) { 868 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST, 869 data->fast_version, id); 870 } 871 872 switch (data->state) { 873 case START: 874 return eap_fast_build_start(sm, data, id); 875 case PHASE1: 876 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 877 if (eap_fast_phase1_done(sm, data) < 0) 878 return NULL; 879 if (data->state == PHASE2_START) { 880 /* 881 * Try to generate Phase 2 data to piggyback 882 * with the end of Phase 1 to avoid extra 883 * roundtrip. 884 */ 885 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start " 886 "Phase 2"); 887 if (eap_fast_process_phase2_start(sm, data)) 888 break; 889 req = eap_fast_build_phase2_req(sm, data, id); 890 piggyback = 1; 891 } 892 } 893 break; 894 case PHASE2_ID: 895 case PHASE2_METHOD: 896 req = eap_fast_build_phase2_req(sm, data, id); 897 break; 898 case CRYPTO_BINDING: 899 req = eap_fast_build_crypto_binding(sm, data); 900 if (data->phase2_method) { 901 /* 902 * Include the start of the next EAP method in the 903 * sequence in the same message with Crypto-Binding to 904 * save a round-trip. 905 */ 906 struct wpabuf *eap; 907 eap = eap_fast_build_phase2_req(sm, data, id); 908 req = wpabuf_concat(req, eap); 909 eap_fast_state(data, PHASE2_METHOD); 910 } 911 break; 912 case REQUEST_PAC: 913 req = eap_fast_build_pac(sm, data); 914 break; 915 default: 916 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d", 917 __func__, data->state); 918 return NULL; 919 } 920 921 if (req && 922 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0) 923 return NULL; 924 925 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST, 926 data->fast_version, id); 927 } 928 929 930 static Boolean eap_fast_check(struct eap_sm *sm, void *priv, 931 struct wpabuf *respData) 932 { 933 const u8 *pos; 934 size_t len; 935 936 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len); 937 if (pos == NULL || len < 1) { 938 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame"); 939 return TRUE; 940 } 941 942 return FALSE; 943 } 944 945 946 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data, 947 EapType eap_type) 948 { 949 if (data->phase2_priv && data->phase2_method) { 950 data->phase2_method->reset(sm, data->phase2_priv); 951 data->phase2_method = NULL; 952 data->phase2_priv = NULL; 953 } 954 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF, 955 eap_type); 956 if (!data->phase2_method) 957 return -1; 958 959 if (data->key_block_p) { 960 sm->auth_challenge = data->key_block_p->server_challenge; 961 sm->peer_challenge = data->key_block_p->client_challenge; 962 } 963 sm->init_phase2 = 1; 964 data->phase2_priv = data->phase2_method->init(sm); 965 sm->init_phase2 = 0; 966 sm->auth_challenge = NULL; 967 sm->peer_challenge = NULL; 968 969 return data->phase2_priv == NULL ? -1 : 0; 970 } 971 972 973 static void eap_fast_process_phase2_response(struct eap_sm *sm, 974 struct eap_fast_data *data, 975 u8 *in_data, size_t in_len) 976 { 977 u8 next_type = EAP_TYPE_NONE; 978 struct eap_hdr *hdr; 979 u8 *pos; 980 size_t left; 981 struct wpabuf buf; 982 const struct eap_method *m = data->phase2_method; 983 void *priv = data->phase2_priv; 984 985 if (priv == NULL) { 986 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not " 987 "initialized?!", __func__); 988 return; 989 } 990 991 hdr = (struct eap_hdr *) in_data; 992 pos = (u8 *) (hdr + 1); 993 994 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) { 995 left = in_len - sizeof(*hdr); 996 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; " 997 "allowed types", pos + 1, left - 1); 998 #ifdef EAP_SERVER_TNC 999 if (m && m->vendor == EAP_VENDOR_IETF && 1000 m->method == EAP_TYPE_TNC) { 1001 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required " 1002 "TNC negotiation"); 1003 next_type = eap_fast_req_failure(sm, data); 1004 eap_fast_phase2_init(sm, data, next_type); 1005 return; 1006 } 1007 #endif /* EAP_SERVER_TNC */ 1008 eap_sm_process_nak(sm, pos + 1, left - 1); 1009 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS && 1010 sm->user->methods[sm->user_eap_method_index].method != 1011 EAP_TYPE_NONE) { 1012 next_type = sm->user->methods[ 1013 sm->user_eap_method_index++].method; 1014 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", 1015 next_type); 1016 } else { 1017 next_type = eap_fast_req_failure(sm, data); 1018 } 1019 eap_fast_phase2_init(sm, data, next_type); 1020 return; 1021 } 1022 1023 wpabuf_set(&buf, in_data, in_len); 1024 1025 if (m->check(sm, priv, &buf)) { 1026 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to " 1027 "ignore the packet"); 1028 eap_fast_req_failure(sm, data); 1029 return; 1030 } 1031 1032 m->process(sm, priv, &buf); 1033 1034 if (!m->isDone(sm, priv)) 1035 return; 1036 1037 if (!m->isSuccess(sm, priv)) { 1038 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed"); 1039 next_type = eap_fast_req_failure(sm, data); 1040 eap_fast_phase2_init(sm, data, next_type); 1041 return; 1042 } 1043 1044 switch (data->state) { 1045 case PHASE2_ID: 1046 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) { 1047 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 " 1048 "Identity not found in the user " 1049 "database", 1050 sm->identity, sm->identity_len); 1051 next_type = eap_fast_req_failure(sm, data); 1052 break; 1053 } 1054 1055 eap_fast_state(data, PHASE2_METHOD); 1056 if (data->anon_provisioning) { 1057 /* 1058 * Only EAP-MSCHAPv2 is allowed for anonymous 1059 * provisioning. 1060 */ 1061 next_type = EAP_TYPE_MSCHAPV2; 1062 sm->user_eap_method_index = 0; 1063 } else { 1064 next_type = sm->user->methods[0].method; 1065 sm->user_eap_method_index = 1; 1066 } 1067 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type); 1068 break; 1069 case PHASE2_METHOD: 1070 case CRYPTO_BINDING: 1071 eap_fast_update_icmk(sm, data); 1072 eap_fast_state(data, CRYPTO_BINDING); 1073 data->eap_seq++; 1074 next_type = EAP_TYPE_NONE; 1075 #ifdef EAP_SERVER_TNC 1076 if (sm->tnc && !data->tnc_started) { 1077 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC"); 1078 next_type = EAP_TYPE_TNC; 1079 data->tnc_started = 1; 1080 } 1081 #endif /* EAP_SERVER_TNC */ 1082 break; 1083 case FAILURE: 1084 break; 1085 default: 1086 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d", 1087 __func__, data->state); 1088 break; 1089 } 1090 1091 eap_fast_phase2_init(sm, data, next_type); 1092 } 1093 1094 1095 static void eap_fast_process_phase2_eap(struct eap_sm *sm, 1096 struct eap_fast_data *data, 1097 u8 *in_data, size_t in_len) 1098 { 1099 struct eap_hdr *hdr; 1100 size_t len; 1101 1102 hdr = (struct eap_hdr *) in_data; 1103 if (in_len < (int) sizeof(*hdr)) { 1104 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1105 "EAP frame (len=%lu)", (unsigned long) in_len); 1106 eap_fast_req_failure(sm, data); 1107 return; 1108 } 1109 len = be_to_host16(hdr->length); 1110 if (len > in_len) { 1111 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in " 1112 "Phase 2 EAP frame (len=%lu hdr->length=%lu)", 1113 (unsigned long) in_len, (unsigned long) len); 1114 eap_fast_req_failure(sm, data); 1115 return; 1116 } 1117 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d " 1118 "identifier=%d length=%lu", hdr->code, hdr->identifier, 1119 (unsigned long) len); 1120 switch (hdr->code) { 1121 case EAP_CODE_RESPONSE: 1122 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len); 1123 break; 1124 default: 1125 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 1126 "Phase 2 EAP header", hdr->code); 1127 break; 1128 } 1129 } 1130 1131 1132 static int eap_fast_parse_tlvs(struct wpabuf *data, 1133 struct eap_fast_tlv_parse *tlv) 1134 { 1135 int mandatory, tlv_type, res; 1136 size_t len; 1137 u8 *pos, *end; 1138 1139 os_memset(tlv, 0, sizeof(*tlv)); 1140 1141 pos = wpabuf_mhead(data); 1142 end = pos + wpabuf_len(data); 1143 while (end - pos > 4) { 1144 mandatory = pos[0] & 0x80; 1145 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1146 pos += 2; 1147 len = WPA_GET_BE16(pos); 1148 pos += 2; 1149 if (len > (size_t) (end - pos)) { 1150 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1151 return -1; 1152 } 1153 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1154 "TLV type %d length %u%s", 1155 tlv_type, (unsigned int) len, 1156 mandatory ? " (mandatory)" : ""); 1157 1158 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1159 if (res == -2) 1160 break; 1161 if (res < 0) { 1162 if (mandatory) { 1163 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1164 "mandatory TLV type %d", tlv_type); 1165 /* TODO: generate Nak TLV */ 1166 break; 1167 } else { 1168 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored " 1169 "unknown optional TLV type %d", 1170 tlv_type); 1171 } 1172 } 1173 1174 pos += len; 1175 } 1176 1177 return 0; 1178 } 1179 1180 1181 static int eap_fast_validate_crypto_binding( 1182 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b, 1183 size_t bind_len) 1184 { 1185 u8 cmac[SHA1_MAC_LEN]; 1186 1187 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: " 1188 "Version %d Received Version %d SubType %d", 1189 b->version, b->received_version, b->subtype); 1190 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 1191 b->nonce, sizeof(b->nonce)); 1192 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 1193 b->compound_mac, sizeof(b->compound_mac)); 1194 1195 if (b->version != EAP_FAST_VERSION || 1196 b->received_version != EAP_FAST_VERSION) { 1197 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version " 1198 "in Crypto-Binding: version %d " 1199 "received_version %d", b->version, 1200 b->received_version); 1201 return -1; 1202 } 1203 1204 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) { 1205 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in " 1206 "Crypto-Binding: %d", b->subtype); 1207 return -1; 1208 } 1209 1210 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 || 1211 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) { 1212 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in " 1213 "Crypto-Binding"); 1214 return -1; 1215 } 1216 1217 os_memcpy(cmac, b->compound_mac, sizeof(cmac)); 1218 os_memset(b->compound_mac, 0, sizeof(cmac)); 1219 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for " 1220 "Compound MAC calculation", 1221 (u8 *) b, bind_len); 1222 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len, 1223 b->compound_mac); 1224 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) { 1225 wpa_hexdump(MSG_MSGDUMP, 1226 "EAP-FAST: Calculated Compound MAC", 1227 b->compound_mac, sizeof(cmac)); 1228 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not " 1229 "match"); 1230 return -1; 1231 } 1232 1233 return 0; 1234 } 1235 1236 1237 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type) 1238 { 1239 struct eap_tlv_pac_type_tlv *tlv; 1240 1241 if (pac == NULL || len != sizeof(*tlv)) 1242 return 0; 1243 1244 tlv = (struct eap_tlv_pac_type_tlv *) pac; 1245 1246 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE && 1247 be_to_host16(tlv->length) == 2 && 1248 be_to_host16(tlv->pac_type) == type; 1249 } 1250 1251 1252 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm, 1253 struct eap_fast_data *data, 1254 struct wpabuf *in_data) 1255 { 1256 struct eap_fast_tlv_parse tlv; 1257 int check_crypto_binding = data->state == CRYPTO_BINDING; 1258 1259 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) { 1260 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received " 1261 "Phase 2 TLVs"); 1262 return; 1263 } 1264 1265 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1266 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated " 1267 "failure"); 1268 eap_fast_state(data, FAILURE); 1269 return; 1270 } 1271 1272 if (data->state == REQUEST_PAC) { 1273 u16 type, len, res; 1274 if (tlv.pac == NULL || tlv.pac_len < 6) { 1275 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC " 1276 "Acknowledgement received"); 1277 eap_fast_state(data, FAILURE); 1278 return; 1279 } 1280 1281 type = WPA_GET_BE16(tlv.pac); 1282 len = WPA_GET_BE16(tlv.pac + 2); 1283 res = WPA_GET_BE16(tlv.pac + 4); 1284 1285 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 || 1286 res != EAP_TLV_RESULT_SUCCESS) { 1287 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not " 1288 "contain acknowledgement"); 1289 eap_fast_state(data, FAILURE); 1290 return; 1291 } 1292 1293 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received " 1294 "- PAC provisioning succeeded"); 1295 eap_fast_state(data, (data->anon_provisioning || 1296 data->send_new_pac == 2) ? 1297 FAILURE : SUCCESS); 1298 return; 1299 } 1300 1301 if (check_crypto_binding) { 1302 if (tlv.crypto_binding == NULL) { 1303 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding " 1304 "TLV received"); 1305 eap_fast_state(data, FAILURE); 1306 return; 1307 } 1308 1309 if (data->final_result && 1310 tlv.result != EAP_TLV_RESULT_SUCCESS) { 1311 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV " 1312 "without Success Result"); 1313 eap_fast_state(data, FAILURE); 1314 return; 1315 } 1316 1317 if (!data->final_result && 1318 tlv.iresult != EAP_TLV_RESULT_SUCCESS) { 1319 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV " 1320 "without intermediate Success Result"); 1321 eap_fast_state(data, FAILURE); 1322 return; 1323 } 1324 1325 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding, 1326 tlv.crypto_binding_len)) { 1327 eap_fast_state(data, FAILURE); 1328 return; 1329 } 1330 1331 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV " 1332 "received"); 1333 if (data->final_result) { 1334 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1335 "completed successfully"); 1336 } 1337 1338 if (data->anon_provisioning && 1339 sm->eap_fast_prov != ANON_PROV && 1340 sm->eap_fast_prov != BOTH_PROV) { 1341 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to " 1342 "use unauthenticated provisioning which is " 1343 "disabled"); 1344 eap_fast_state(data, FAILURE); 1345 return; 1346 } 1347 1348 if (sm->eap_fast_prov != AUTH_PROV && 1349 sm->eap_fast_prov != BOTH_PROV && 1350 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV && 1351 eap_fast_pac_type(tlv.pac, tlv.pac_len, 1352 PAC_TYPE_TUNNEL_PAC)) { 1353 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to " 1354 "use authenticated provisioning which is " 1355 "disabled"); 1356 eap_fast_state(data, FAILURE); 1357 return; 1358 } 1359 1360 if (data->anon_provisioning || 1361 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV && 1362 eap_fast_pac_type(tlv.pac, tlv.pac_len, 1363 PAC_TYPE_TUNNEL_PAC))) { 1364 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new " 1365 "Tunnel PAC"); 1366 eap_fast_state(data, REQUEST_PAC); 1367 } else if (data->send_new_pac) { 1368 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered " 1369 "re-keying of Tunnel PAC"); 1370 eap_fast_state(data, REQUEST_PAC); 1371 } else if (data->final_result) 1372 eap_fast_state(data, SUCCESS); 1373 } 1374 1375 if (tlv.eap_payload_tlv) { 1376 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv, 1377 tlv.eap_payload_tlv_len); 1378 } 1379 } 1380 1381 1382 static void eap_fast_process_phase2(struct eap_sm *sm, 1383 struct eap_fast_data *data, 1384 struct wpabuf *in_buf) 1385 { 1386 struct wpabuf *in_decrypted; 1387 1388 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1389 " Phase 2", (unsigned long) wpabuf_len(in_buf)); 1390 1391 if (data->pending_phase2_resp) { 1392 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - " 1393 "skip decryption and use old data"); 1394 eap_fast_process_phase2_tlvs(sm, data, 1395 data->pending_phase2_resp); 1396 wpabuf_free(data->pending_phase2_resp); 1397 data->pending_phase2_resp = NULL; 1398 return; 1399 } 1400 1401 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn, 1402 in_buf); 1403 if (in_decrypted == NULL) { 1404 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 " 1405 "data"); 1406 eap_fast_state(data, FAILURE); 1407 return; 1408 } 1409 1410 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs", 1411 in_decrypted); 1412 1413 eap_fast_process_phase2_tlvs(sm, data, in_decrypted); 1414 1415 if (sm->method_pending == METHOD_PENDING_WAIT) { 1416 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in " 1417 "pending wait state - save decrypted response"); 1418 wpabuf_free(data->pending_phase2_resp); 1419 data->pending_phase2_resp = in_decrypted; 1420 return; 1421 } 1422 1423 wpabuf_free(in_decrypted); 1424 } 1425 1426 1427 static int eap_fast_process_version(struct eap_sm *sm, void *priv, 1428 int peer_version) 1429 { 1430 struct eap_fast_data *data = priv; 1431 1432 data->peer_version = peer_version; 1433 1434 if (data->force_version >= 0 && peer_version != data->force_version) { 1435 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced" 1436 " version (forced=%d peer=%d) - reject", 1437 data->force_version, peer_version); 1438 return -1; 1439 } 1440 1441 if (peer_version < data->fast_version) { 1442 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; " 1443 "use version %d", 1444 peer_version, data->fast_version, peer_version); 1445 data->fast_version = peer_version; 1446 } 1447 1448 return 0; 1449 } 1450 1451 1452 static int eap_fast_process_phase1(struct eap_sm *sm, 1453 struct eap_fast_data *data) 1454 { 1455 if (eap_server_tls_phase1(sm, &data->ssl) < 0) { 1456 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed"); 1457 eap_fast_state(data, FAILURE); 1458 return -1; 1459 } 1460 1461 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) || 1462 wpabuf_len(data->ssl.tls_out) > 0) 1463 return 1; 1464 1465 /* 1466 * Phase 1 was completed with the received message (e.g., when using 1467 * abbreviated handshake), so Phase 2 can be started immediately 1468 * without having to send through an empty message to the peer. 1469 */ 1470 1471 return eap_fast_phase1_done(sm, data); 1472 } 1473 1474 1475 static int eap_fast_process_phase2_start(struct eap_sm *sm, 1476 struct eap_fast_data *data) 1477 { 1478 u8 next_type; 1479 1480 if (data->identity) { 1481 os_free(sm->identity); 1482 sm->identity = data->identity; 1483 data->identity = NULL; 1484 sm->identity_len = data->identity_len; 1485 data->identity_len = 0; 1486 sm->require_identity_match = 1; 1487 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) { 1488 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: " 1489 "Phase2 Identity not found " 1490 "in the user database", 1491 sm->identity, sm->identity_len); 1492 next_type = eap_fast_req_failure(sm, data); 1493 } else { 1494 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already " 1495 "known - skip Phase 2 Identity Request"); 1496 next_type = sm->user->methods[0].method; 1497 sm->user_eap_method_index = 1; 1498 } 1499 1500 eap_fast_state(data, PHASE2_METHOD); 1501 } else { 1502 eap_fast_state(data, PHASE2_ID); 1503 next_type = EAP_TYPE_IDENTITY; 1504 } 1505 1506 return eap_fast_phase2_init(sm, data, next_type); 1507 } 1508 1509 1510 static void eap_fast_process_msg(struct eap_sm *sm, void *priv, 1511 const struct wpabuf *respData) 1512 { 1513 struct eap_fast_data *data = priv; 1514 1515 switch (data->state) { 1516 case PHASE1: 1517 if (eap_fast_process_phase1(sm, data)) 1518 break; 1519 1520 /* fall through to PHASE2_START */ 1521 case PHASE2_START: 1522 eap_fast_process_phase2_start(sm, data); 1523 break; 1524 case PHASE2_ID: 1525 case PHASE2_METHOD: 1526 case CRYPTO_BINDING: 1527 case REQUEST_PAC: 1528 eap_fast_process_phase2(sm, data, data->ssl.tls_in); 1529 break; 1530 default: 1531 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s", 1532 data->state, __func__); 1533 break; 1534 } 1535 } 1536 1537 1538 static void eap_fast_process(struct eap_sm *sm, void *priv, 1539 struct wpabuf *respData) 1540 { 1541 struct eap_fast_data *data = priv; 1542 if (eap_server_tls_process(sm, &data->ssl, respData, data, 1543 EAP_TYPE_FAST, eap_fast_process_version, 1544 eap_fast_process_msg) < 0) 1545 eap_fast_state(data, FAILURE); 1546 } 1547 1548 1549 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv) 1550 { 1551 struct eap_fast_data *data = priv; 1552 return data->state == SUCCESS || data->state == FAILURE; 1553 } 1554 1555 1556 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1557 { 1558 struct eap_fast_data *data = priv; 1559 u8 *eapKeyData; 1560 1561 if (data->state != SUCCESS) 1562 return NULL; 1563 1564 eapKeyData = os_malloc(EAP_FAST_KEY_LEN); 1565 if (eapKeyData == NULL) 1566 return NULL; 1567 1568 if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) { 1569 os_free(eapKeyData); 1570 return NULL; 1571 } 1572 *len = EAP_FAST_KEY_LEN; 1573 1574 return eapKeyData; 1575 } 1576 1577 1578 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1579 { 1580 struct eap_fast_data *data = priv; 1581 u8 *eapKeyData; 1582 1583 if (data->state != SUCCESS) 1584 return NULL; 1585 1586 eapKeyData = os_malloc(EAP_EMSK_LEN); 1587 if (eapKeyData == NULL) 1588 return NULL; 1589 1590 if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) { 1591 os_free(eapKeyData); 1592 return NULL; 1593 } 1594 *len = EAP_EMSK_LEN; 1595 1596 return eapKeyData; 1597 } 1598 1599 1600 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv) 1601 { 1602 struct eap_fast_data *data = priv; 1603 return data->state == SUCCESS; 1604 } 1605 1606 1607 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1608 { 1609 struct eap_fast_data *data = priv; 1610 1611 if (data->state != SUCCESS) 1612 return NULL; 1613 1614 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST, 1615 len); 1616 } 1617 1618 1619 int eap_server_fast_register(void) 1620 { 1621 struct eap_method *eap; 1622 1623 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 1624 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1625 if (eap == NULL) 1626 return -1; 1627 1628 eap->init = eap_fast_init; 1629 eap->reset = eap_fast_reset; 1630 eap->buildReq = eap_fast_buildReq; 1631 eap->check = eap_fast_check; 1632 eap->process = eap_fast_process; 1633 eap->isDone = eap_fast_isDone; 1634 eap->getKey = eap_fast_getKey; 1635 eap->get_emsk = eap_fast_get_emsk; 1636 eap->isSuccess = eap_fast_isSuccess; 1637 eap->getSessionId = eap_fast_get_session_id; 1638 1639 return eap_server_method_register(eap); 1640 } 1641
