1 /* 2 * EAP peer method: EAP-FAST (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/tls.h" 13 #include "crypto/sha1.h" 14 #include "eap_common/eap_tlv_common.h" 15 #include "eap_i.h" 16 #include "eap_tls_common.h" 17 #include "eap_config.h" 18 #include "eap_fast_pac.h" 19 20 #ifdef EAP_FAST_DYNAMIC 21 #include "eap_fast_pac.c" 22 #endif /* EAP_FAST_DYNAMIC */ 23 24 /* TODO: 25 * - test session resumption and enable it if it interoperates 26 * - password change (pending mschapv2 packet; replay decrypted packet) 27 */ 28 29 30 static void eap_fast_deinit(struct eap_sm *sm, void *priv); 31 32 33 struct eap_fast_data { 34 struct eap_ssl_data ssl; 35 36 int fast_version; 37 38 const struct eap_method *phase2_method; 39 void *phase2_priv; 40 int phase2_success; 41 42 struct eap_method_type phase2_type; 43 struct eap_method_type *phase2_types; 44 size_t num_phase2_types; 45 int resuming; /* starting a resumed session */ 46 struct eap_fast_key_block_provisioning *key_block_p; 47 #define EAP_FAST_PROV_UNAUTH 1 48 #define EAP_FAST_PROV_AUTH 2 49 int provisioning_allowed; /* Allowed PAC provisioning modes */ 50 int provisioning; /* doing PAC provisioning (not the normal auth) */ 51 int anon_provisioning; /* doing anonymous (unauthenticated) 52 * provisioning */ 53 int session_ticket_used; 54 55 u8 key_data[EAP_FAST_KEY_LEN]; 56 u8 *session_id; 57 size_t id_len; 58 u8 emsk[EAP_EMSK_LEN]; 59 int success; 60 61 struct eap_fast_pac *pac; 62 struct eap_fast_pac *current_pac; 63 size_t max_pac_list_len; 64 int use_pac_binary_format; 65 66 u8 simck[EAP_FAST_SIMCK_LEN]; 67 int simck_idx; 68 69 struct wpabuf *pending_phase2_req; 70 }; 71 72 73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 74 const u8 *client_random, 75 const u8 *server_random, 76 u8 *master_secret) 77 { 78 struct eap_fast_data *data = ctx; 79 80 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 81 82 if (client_random == NULL || server_random == NULL || 83 master_secret == NULL) { 84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall " 85 "back to full TLS handshake"); 86 data->session_ticket_used = 0; 87 if (data->provisioning_allowed) { 88 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a " 89 "new PAC-Key"); 90 data->provisioning = 1; 91 data->current_pac = NULL; 92 } 93 return 0; 94 } 95 96 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len); 97 98 if (data->current_pac == NULL) { 99 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for " 100 "using SessionTicket"); 101 data->session_ticket_used = 0; 102 return 0; 103 } 104 105 eap_fast_derive_master_secret(data->current_pac->pac_key, 106 server_random, client_random, 107 master_secret); 108 109 data->session_ticket_used = 1; 110 111 return 1; 112 } 113 114 115 static int eap_fast_parse_phase1(struct eap_fast_data *data, 116 const char *phase1) 117 { 118 const char *pos; 119 120 pos = os_strstr(phase1, "fast_provisioning="); 121 if (pos) { 122 data->provisioning_allowed = atoi(pos + 18); 123 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning " 124 "mode: %d", data->provisioning_allowed); 125 } 126 127 pos = os_strstr(phase1, "fast_max_pac_list_len="); 128 if (pos) { 129 data->max_pac_list_len = atoi(pos + 22); 130 if (data->max_pac_list_len == 0) 131 data->max_pac_list_len = 1; 132 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu", 133 (unsigned long) data->max_pac_list_len); 134 } 135 136 pos = os_strstr(phase1, "fast_pac_format=binary"); 137 if (pos) { 138 data->use_pac_binary_format = 1; 139 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC " 140 "list"); 141 } 142 143 return 0; 144 } 145 146 147 static void * eap_fast_init(struct eap_sm *sm) 148 { 149 struct eap_fast_data *data; 150 struct eap_peer_config *config = eap_get_config(sm); 151 152 if (config == NULL) 153 return NULL; 154 155 data = os_zalloc(sizeof(*data)); 156 if (data == NULL) 157 return NULL; 158 data->fast_version = EAP_FAST_VERSION; 159 data->max_pac_list_len = 10; 160 161 if (config->phase1 && eap_fast_parse_phase1(data, config->phase1) < 0) { 162 eap_fast_deinit(sm, data); 163 return NULL; 164 } 165 166 if (eap_peer_select_phase2_methods(config, "auth=", 167 &data->phase2_types, 168 &data->num_phase2_types) < 0) { 169 eap_fast_deinit(sm, data); 170 return NULL; 171 } 172 173 data->phase2_type.vendor = EAP_VENDOR_IETF; 174 data->phase2_type.method = EAP_TYPE_NONE; 175 176 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) { 177 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 178 eap_fast_deinit(sm, data); 179 return NULL; 180 } 181 182 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 183 eap_fast_session_ticket_cb, 184 data) < 0) { 185 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 186 "callback"); 187 eap_fast_deinit(sm, data); 188 return NULL; 189 } 190 191 /* 192 * The local RADIUS server in a Cisco AP does not seem to like empty 193 * fragments before data, so disable that workaround for CBC. 194 * TODO: consider making this configurable 195 */ 196 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) { 197 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS " 198 "workarounds"); 199 } 200 201 if (!config->pac_file) { 202 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured"); 203 eap_fast_deinit(sm, data); 204 return NULL; 205 } 206 207 if (data->use_pac_binary_format && 208 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) { 209 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 210 eap_fast_deinit(sm, data); 211 return NULL; 212 } 213 214 if (!data->use_pac_binary_format && 215 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) { 216 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 217 eap_fast_deinit(sm, data); 218 return NULL; 219 } 220 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 221 222 if (data->pac == NULL && !data->provisioning_allowed) { 223 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and " 224 "provisioning disabled"); 225 eap_fast_deinit(sm, data); 226 return NULL; 227 } 228 229 return data; 230 } 231 232 233 static void eap_fast_deinit(struct eap_sm *sm, void *priv) 234 { 235 struct eap_fast_data *data = priv; 236 struct eap_fast_pac *pac, *prev; 237 238 if (data == NULL) 239 return; 240 if (data->phase2_priv && data->phase2_method) 241 data->phase2_method->deinit(sm, data->phase2_priv); 242 os_free(data->phase2_types); 243 os_free(data->key_block_p); 244 eap_peer_tls_ssl_deinit(sm, &data->ssl); 245 246 pac = data->pac; 247 prev = NULL; 248 while (pac) { 249 prev = pac; 250 pac = pac->next; 251 eap_fast_free_pac(prev); 252 } 253 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 254 os_memset(data->emsk, 0, EAP_EMSK_LEN); 255 os_free(data->session_id); 256 wpabuf_free(data->pending_phase2_req); 257 os_free(data); 258 } 259 260 261 static int eap_fast_derive_msk(struct eap_fast_data *data) 262 { 263 eap_fast_derive_eap_msk(data->simck, data->key_data); 264 eap_fast_derive_eap_emsk(data->simck, data->emsk); 265 data->success = 1; 266 return 0; 267 } 268 269 270 static int eap_fast_derive_key_auth(struct eap_sm *sm, 271 struct eap_fast_data *data) 272 { 273 u8 *sks; 274 275 /* RFC 4851, Section 5.1: 276 * Extra key material after TLS key_block: session_key_seed[40] 277 */ 278 279 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion", 280 EAP_FAST_SKS_LEN); 281 if (sks == NULL) { 282 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 283 "session_key_seed"); 284 return -1; 285 } 286 287 /* 288 * RFC 4851, Section 5.2: 289 * S-IMCK[0] = session_key_seed 290 */ 291 wpa_hexdump_key(MSG_DEBUG, 292 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 293 sks, EAP_FAST_SKS_LEN); 294 data->simck_idx = 0; 295 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 296 os_free(sks); 297 return 0; 298 } 299 300 301 static int eap_fast_derive_key_provisioning(struct eap_sm *sm, 302 struct eap_fast_data *data) 303 { 304 os_free(data->key_block_p); 305 data->key_block_p = (struct eap_fast_key_block_provisioning *) 306 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 307 "key expansion", 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 -1; 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 return 0; 331 } 332 333 334 static int eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 335 { 336 int res; 337 338 if (data->anon_provisioning) 339 res = eap_fast_derive_key_provisioning(sm, data); 340 else 341 res = eap_fast_derive_key_auth(sm, data); 342 return res; 343 } 344 345 346 static int eap_fast_init_phase2_method(struct eap_sm *sm, 347 struct eap_fast_data *data) 348 { 349 data->phase2_method = 350 eap_peer_get_eap_method(data->phase2_type.vendor, 351 data->phase2_type.method); 352 if (data->phase2_method == NULL) 353 return -1; 354 355 if (data->key_block_p) { 356 sm->auth_challenge = data->key_block_p->server_challenge; 357 sm->peer_challenge = data->key_block_p->client_challenge; 358 } 359 sm->init_phase2 = 1; 360 data->phase2_priv = data->phase2_method->init(sm); 361 sm->init_phase2 = 0; 362 sm->auth_challenge = NULL; 363 sm->peer_challenge = NULL; 364 365 return data->phase2_priv == NULL ? -1 : 0; 366 } 367 368 369 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type) 370 { 371 size_t i; 372 373 /* TODO: TNC with anonymous provisioning; need to require both 374 * completed MSCHAPv2 and TNC */ 375 376 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) { 377 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 378 "during unauthenticated provisioning; reject phase2" 379 " type %d", type); 380 return -1; 381 } 382 383 #ifdef EAP_TNC 384 if (type == EAP_TYPE_TNC) { 385 data->phase2_type.vendor = EAP_VENDOR_IETF; 386 data->phase2_type.method = EAP_TYPE_TNC; 387 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 388 "vendor %d method %d for TNC", 389 data->phase2_type.vendor, 390 data->phase2_type.method); 391 return 0; 392 } 393 #endif /* EAP_TNC */ 394 395 for (i = 0; i < data->num_phase2_types; i++) { 396 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 397 data->phase2_types[i].method != type) 398 continue; 399 400 data->phase2_type.vendor = data->phase2_types[i].vendor; 401 data->phase2_type.method = data->phase2_types[i].method; 402 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 403 "vendor %d method %d", 404 data->phase2_type.vendor, 405 data->phase2_type.method); 406 break; 407 } 408 409 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 410 return -1; 411 412 return 0; 413 } 414 415 416 static int eap_fast_phase2_request(struct eap_sm *sm, 417 struct eap_fast_data *data, 418 struct eap_method_ret *ret, 419 struct eap_hdr *hdr, 420 struct wpabuf **resp) 421 { 422 size_t len = be_to_host16(hdr->length); 423 u8 *pos; 424 struct eap_method_ret iret; 425 struct eap_peer_config *config = eap_get_config(sm); 426 struct wpabuf msg; 427 428 if (len <= sizeof(struct eap_hdr)) { 429 wpa_printf(MSG_INFO, "EAP-FAST: too short " 430 "Phase 2 request (len=%lu)", (unsigned long) len); 431 return -1; 432 } 433 pos = (u8 *) (hdr + 1); 434 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 435 if (*pos == EAP_TYPE_IDENTITY) { 436 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 437 return 0; 438 } 439 440 if (data->phase2_priv && data->phase2_method && 441 *pos != data->phase2_type.method) { 442 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 443 "deinitialize previous method"); 444 data->phase2_method->deinit(sm, data->phase2_priv); 445 data->phase2_method = NULL; 446 data->phase2_priv = NULL; 447 data->phase2_type.vendor = EAP_VENDOR_IETF; 448 data->phase2_type.method = EAP_TYPE_NONE; 449 } 450 451 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 452 data->phase2_type.method == EAP_TYPE_NONE && 453 eap_fast_select_phase2_method(data, *pos) < 0) { 454 if (eap_peer_tls_phase2_nak(data->phase2_types, 455 data->num_phase2_types, 456 hdr, resp)) 457 return -1; 458 return 0; 459 } 460 461 if ((data->phase2_priv == NULL && 462 eap_fast_init_phase2_method(sm, data) < 0) || 463 data->phase2_method == NULL) { 464 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 465 "Phase 2 EAP method %d", *pos); 466 ret->methodState = METHOD_DONE; 467 ret->decision = DECISION_FAIL; 468 return -1; 469 } 470 471 os_memset(&iret, 0, sizeof(iret)); 472 wpabuf_set(&msg, hdr, len); 473 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 474 &msg); 475 if (*resp == NULL || 476 (iret.methodState == METHOD_DONE && 477 iret.decision == DECISION_FAIL)) { 478 ret->methodState = METHOD_DONE; 479 ret->decision = DECISION_FAIL; 480 } else if ((iret.methodState == METHOD_DONE || 481 iret.methodState == METHOD_MAY_CONT) && 482 (iret.decision == DECISION_UNCOND_SUCC || 483 iret.decision == DECISION_COND_SUCC)) { 484 data->phase2_success = 1; 485 } 486 487 if (*resp == NULL && config && 488 (config->pending_req_identity || config->pending_req_password || 489 config->pending_req_otp || config->pending_req_new_password)) { 490 wpabuf_free(data->pending_phase2_req); 491 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 492 } else if (*resp == NULL) 493 return -1; 494 495 return 0; 496 } 497 498 499 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 500 { 501 struct wpabuf *buf; 502 struct eap_tlv_nak_tlv *nak; 503 buf = wpabuf_alloc(sizeof(*nak)); 504 if (buf == NULL) 505 return NULL; 506 nak = wpabuf_put(buf, sizeof(*nak)); 507 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 508 nak->length = host_to_be16(6); 509 nak->vendor_id = host_to_be32(vendor_id); 510 nak->nak_type = host_to_be16(tlv_type); 511 return buf; 512 } 513 514 515 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 516 { 517 struct wpabuf *buf; 518 struct eap_tlv_intermediate_result_tlv *result; 519 buf = wpabuf_alloc(sizeof(*result)); 520 if (buf == NULL) 521 return NULL; 522 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 523 intermediate ? "Intermediate " : "", status); 524 result = wpabuf_put(buf, sizeof(*result)); 525 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 526 (intermediate ? 527 EAP_TLV_INTERMEDIATE_RESULT_TLV : 528 EAP_TLV_RESULT_TLV)); 529 result->length = host_to_be16(2); 530 result->status = host_to_be16(status); 531 return buf; 532 } 533 534 535 static struct wpabuf * eap_fast_tlv_pac_ack(void) 536 { 537 struct wpabuf *buf; 538 struct eap_tlv_result_tlv *res; 539 struct eap_tlv_pac_ack_tlv *ack; 540 541 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 542 if (buf == NULL) 543 return NULL; 544 545 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 546 ack = wpabuf_put(buf, sizeof(*ack)); 547 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 548 EAP_TLV_TYPE_MANDATORY); 549 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 550 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 551 ack->pac_len = host_to_be16(2); 552 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 553 554 return buf; 555 } 556 557 558 static struct wpabuf * eap_fast_process_eap_payload_tlv( 559 struct eap_sm *sm, struct eap_fast_data *data, 560 struct eap_method_ret *ret, 561 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 562 { 563 struct eap_hdr *hdr; 564 struct wpabuf *resp = NULL; 565 566 if (eap_payload_tlv_len < sizeof(*hdr)) { 567 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 568 "Payload TLV (len=%lu)", 569 (unsigned long) eap_payload_tlv_len); 570 return NULL; 571 } 572 573 hdr = (struct eap_hdr *) eap_payload_tlv; 574 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 575 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 576 "EAP Payload TLV"); 577 return NULL; 578 } 579 580 if (hdr->code != EAP_CODE_REQUEST) { 581 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 582 "Phase 2 EAP header", hdr->code); 583 return NULL; 584 } 585 586 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 587 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 588 "failed"); 589 return NULL; 590 } 591 592 return eap_fast_tlv_eap_payload(resp); 593 } 594 595 596 static int eap_fast_validate_crypto_binding( 597 struct eap_tlv_crypto_binding_tlv *_bind) 598 { 599 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 600 "Received Version %d SubType %d", 601 _bind->version, _bind->received_version, _bind->subtype); 602 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 603 _bind->nonce, sizeof(_bind->nonce)); 604 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 605 _bind->compound_mac, sizeof(_bind->compound_mac)); 606 607 if (_bind->version != EAP_FAST_VERSION || 608 _bind->received_version != EAP_FAST_VERSION || 609 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 610 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 611 "Crypto-Binding TLV: Version %d " 612 "Received Version %d SubType %d", 613 _bind->version, _bind->received_version, 614 _bind->subtype); 615 return -1; 616 } 617 618 return 0; 619 } 620 621 622 static void eap_fast_write_crypto_binding( 623 struct eap_tlv_crypto_binding_tlv *rbind, 624 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 625 { 626 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 627 EAP_TLV_CRYPTO_BINDING_TLV); 628 rbind->length = host_to_be16(sizeof(*rbind) - 629 sizeof(struct eap_tlv_hdr)); 630 rbind->version = EAP_FAST_VERSION; 631 rbind->received_version = _bind->version; 632 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 633 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 634 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 635 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 636 rbind->compound_mac); 637 638 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 639 "Received Version %d SubType %d", 640 rbind->version, rbind->received_version, rbind->subtype); 641 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 642 rbind->nonce, sizeof(rbind->nonce)); 643 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 644 rbind->compound_mac, sizeof(rbind->compound_mac)); 645 } 646 647 648 static int eap_fast_get_phase2_key(struct eap_sm *sm, 649 struct eap_fast_data *data, 650 u8 *isk, size_t isk_len) 651 { 652 u8 *key; 653 size_t key_len; 654 655 os_memset(isk, 0, isk_len); 656 657 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 658 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 659 "available"); 660 return -1; 661 } 662 663 if (data->phase2_method->isKeyAvailable == NULL || 664 data->phase2_method->getKey == NULL) 665 return 0; 666 667 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 668 (key = data->phase2_method->getKey(sm, data->phase2_priv, 669 &key_len)) == NULL) { 670 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 671 "from Phase 2"); 672 return -1; 673 } 674 675 if (key_len > isk_len) 676 key_len = isk_len; 677 if (key_len == 32 && 678 data->phase2_method->vendor == EAP_VENDOR_IETF && 679 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 680 /* 681 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 682 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 683 * ISK for EAP-FAST cryptobinding. 684 */ 685 os_memcpy(isk, key + 16, 16); 686 os_memcpy(isk + 16, key, 16); 687 } else 688 os_memcpy(isk, key, key_len); 689 os_free(key); 690 691 return 0; 692 } 693 694 695 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 696 u8 *cmk) 697 { 698 u8 isk[32], imck[60]; 699 700 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 701 "calculation", data->simck_idx + 1); 702 703 /* 704 * RFC 4851, Section 5.2: 705 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 706 * MSK[j], 60) 707 * S-IMCK[j] = first 40 octets of IMCK[j] 708 * CMK[j] = last 20 octets of IMCK[j] 709 */ 710 711 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 712 return -1; 713 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 714 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 715 "Inner Methods Compound Keys", 716 isk, sizeof(isk), imck, sizeof(imck)); 717 data->simck_idx++; 718 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 719 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 720 data->simck, EAP_FAST_SIMCK_LEN); 721 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 722 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 723 cmk, EAP_FAST_CMK_LEN); 724 725 return 0; 726 } 727 728 729 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 730 { 731 struct eap_tlv_hdr *pac; 732 struct eap_tlv_request_action_tlv *act; 733 struct eap_tlv_pac_type_tlv *type; 734 735 act = (struct eap_tlv_request_action_tlv *) pos; 736 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 737 act->length = host_to_be16(2); 738 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 739 740 pac = (struct eap_tlv_hdr *) (act + 1); 741 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 742 pac->length = host_to_be16(sizeof(*type)); 743 744 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 745 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 746 type->length = host_to_be16(2); 747 type->pac_type = host_to_be16(pac_type); 748 749 return (u8 *) (type + 1); 750 } 751 752 753 static struct wpabuf * eap_fast_process_crypto_binding( 754 struct eap_sm *sm, struct eap_fast_data *data, 755 struct eap_method_ret *ret, 756 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 757 { 758 struct wpabuf *resp; 759 u8 *pos; 760 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 761 int res; 762 size_t len; 763 764 if (eap_fast_validate_crypto_binding(_bind) < 0) 765 return NULL; 766 767 if (eap_fast_get_cmk(sm, data, cmk) < 0) 768 return NULL; 769 770 /* Validate received Compound MAC */ 771 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 772 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 773 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 774 "MAC calculation", (u8 *) _bind, bind_len); 775 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 776 _bind->compound_mac); 777 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 778 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 779 cmac, sizeof(cmac)); 780 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 781 _bind->compound_mac, sizeof(cmac)); 782 if (res != 0) { 783 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 784 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 785 return NULL; 786 } 787 788 /* 789 * Compound MAC was valid, so authentication succeeded. Reply with 790 * crypto binding to allow server to complete authentication. 791 */ 792 793 len = sizeof(struct eap_tlv_crypto_binding_tlv); 794 resp = wpabuf_alloc(len); 795 if (resp == NULL) 796 return NULL; 797 798 if (!data->anon_provisioning && data->phase2_success && 799 eap_fast_derive_msk(data) < 0) { 800 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 801 ret->methodState = METHOD_DONE; 802 ret->decision = DECISION_FAIL; 803 data->phase2_success = 0; 804 wpabuf_free(resp); 805 return NULL; 806 } 807 808 if (!data->anon_provisioning && data->phase2_success) { 809 os_free(data->session_id); 810 data->session_id = eap_peer_tls_derive_session_id( 811 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 812 if (data->session_id) { 813 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 814 data->session_id, data->id_len); 815 } else { 816 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 817 "Session-Id"); 818 wpabuf_free(resp); 819 return NULL; 820 } 821 } 822 823 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 824 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 825 pos, _bind, cmk); 826 827 return resp; 828 } 829 830 831 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 832 u8 *pos, size_t len, int *pac_key_found) 833 { 834 switch (type & 0x7fff) { 835 case PAC_TYPE_PAC_KEY: 836 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 837 if (len != EAP_FAST_PAC_KEY_LEN) { 838 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 839 "length %lu", (unsigned long) len); 840 break; 841 } 842 *pac_key_found = 1; 843 os_memcpy(entry->pac_key, pos, len); 844 break; 845 case PAC_TYPE_PAC_OPAQUE: 846 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 847 entry->pac_opaque = pos; 848 entry->pac_opaque_len = len; 849 break; 850 case PAC_TYPE_PAC_INFO: 851 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 852 entry->pac_info = pos; 853 entry->pac_info_len = len; 854 break; 855 default: 856 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 857 type); 858 break; 859 } 860 } 861 862 863 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 864 u8 *pac, size_t pac_len) 865 { 866 struct pac_tlv_hdr *hdr; 867 u8 *pos; 868 size_t left, len; 869 int type, pac_key_found = 0; 870 871 pos = pac; 872 left = pac_len; 873 874 while (left > sizeof(*hdr)) { 875 hdr = (struct pac_tlv_hdr *) pos; 876 type = be_to_host16(hdr->type); 877 len = be_to_host16(hdr->len); 878 pos += sizeof(*hdr); 879 left -= sizeof(*hdr); 880 if (len > left) { 881 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 882 "(type=%d len=%lu left=%lu)", 883 type, (unsigned long) len, 884 (unsigned long) left); 885 return -1; 886 } 887 888 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 889 890 pos += len; 891 left -= len; 892 } 893 894 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 895 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 896 "all the required fields"); 897 return -1; 898 } 899 900 return 0; 901 } 902 903 904 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 905 u8 *pos, size_t len) 906 { 907 u16 pac_type; 908 u32 lifetime; 909 struct os_time now; 910 911 switch (type & 0x7fff) { 912 case PAC_TYPE_CRED_LIFETIME: 913 if (len != 4) { 914 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 915 "Invalid CRED_LIFETIME length - ignored", 916 pos, len); 917 return 0; 918 } 919 920 /* 921 * This is not currently saved separately in PAC files since 922 * the server can automatically initiate PAC update when 923 * needed. Anyway, the information is available from PAC-Info 924 * dump if it is needed for something in the future. 925 */ 926 lifetime = WPA_GET_BE32(pos); 927 os_get_time(&now); 928 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 929 "(%d days)", 930 lifetime, (lifetime - (u32) now.sec) / 86400); 931 break; 932 case PAC_TYPE_A_ID: 933 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 934 pos, len); 935 entry->a_id = pos; 936 entry->a_id_len = len; 937 break; 938 case PAC_TYPE_I_ID: 939 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 940 pos, len); 941 entry->i_id = pos; 942 entry->i_id_len = len; 943 break; 944 case PAC_TYPE_A_ID_INFO: 945 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 946 pos, len); 947 entry->a_id_info = pos; 948 entry->a_id_info_len = len; 949 break; 950 case PAC_TYPE_PAC_TYPE: 951 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 952 if (len != 2) { 953 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 954 "length %lu (expected 2)", 955 (unsigned long) len); 956 wpa_hexdump_ascii(MSG_DEBUG, 957 "EAP-FAST: PAC-Info - PAC-Type", 958 pos, len); 959 return -1; 960 } 961 pac_type = WPA_GET_BE16(pos); 962 if (pac_type != PAC_TYPE_TUNNEL_PAC && 963 pac_type != PAC_TYPE_USER_AUTHORIZATION && 964 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 965 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 966 "%d", pac_type); 967 return -1; 968 } 969 970 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 971 pac_type); 972 entry->pac_type = pac_type; 973 break; 974 default: 975 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 976 "type %d", type); 977 break; 978 } 979 980 return 0; 981 } 982 983 984 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 985 { 986 struct pac_tlv_hdr *hdr; 987 u8 *pos; 988 size_t left, len; 989 int type; 990 991 /* RFC 5422, Section 4.2.4 */ 992 993 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 994 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 995 996 pos = entry->pac_info; 997 left = entry->pac_info_len; 998 while (left > sizeof(*hdr)) { 999 hdr = (struct pac_tlv_hdr *) pos; 1000 type = be_to_host16(hdr->type); 1001 len = be_to_host16(hdr->len); 1002 pos += sizeof(*hdr); 1003 left -= sizeof(*hdr); 1004 if (len > left) { 1005 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1006 "(type=%d len=%lu left=%lu)", 1007 type, (unsigned long) len, 1008 (unsigned long) left); 1009 return -1; 1010 } 1011 1012 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1013 return -1; 1014 1015 pos += len; 1016 left -= len; 1017 } 1018 1019 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1020 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1021 "all the required fields"); 1022 return -1; 1023 } 1024 1025 return 0; 1026 } 1027 1028 1029 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1030 struct eap_fast_data *data, 1031 struct eap_method_ret *ret, 1032 u8 *pac, size_t pac_len) 1033 { 1034 struct eap_peer_config *config = eap_get_config(sm); 1035 struct eap_fast_pac entry; 1036 1037 os_memset(&entry, 0, sizeof(entry)); 1038 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1039 eap_fast_process_pac_info(&entry)) 1040 return NULL; 1041 1042 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1043 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1044 if (data->use_pac_binary_format) 1045 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1046 else 1047 eap_fast_save_pac(sm, data->pac, config->pac_file); 1048 1049 if (data->provisioning) { 1050 if (data->anon_provisioning) { 1051 /* 1052 * Unauthenticated provisioning does not provide keying 1053 * material and must end with an EAP-Failure. 1054 * Authentication will be done separately after this. 1055 */ 1056 data->success = 0; 1057 ret->decision = DECISION_FAIL; 1058 } else { 1059 /* 1060 * Server may or may not allow authenticated 1061 * provisioning also for key generation. 1062 */ 1063 ret->decision = DECISION_COND_SUCC; 1064 } 1065 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1066 "- Provisioning completed successfully"); 1067 sm->expected_failure = 1; 1068 } else { 1069 /* 1070 * This is PAC refreshing, i.e., normal authentication that is 1071 * expected to be completed with an EAP-Success. However, 1072 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1073 * after protected success exchange in case of EAP-Fast 1074 * provisioning, so we better use DECISION_COND_SUCC here 1075 * instead of DECISION_UNCOND_SUCC. 1076 */ 1077 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1078 "- PAC refreshing completed successfully"); 1079 ret->decision = DECISION_COND_SUCC; 1080 } 1081 ret->methodState = METHOD_DONE; 1082 return eap_fast_tlv_pac_ack(); 1083 } 1084 1085 1086 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1087 struct eap_fast_tlv_parse *tlv, 1088 struct wpabuf **resp) 1089 { 1090 int mandatory, tlv_type, res; 1091 size_t len; 1092 u8 *pos, *end; 1093 1094 os_memset(tlv, 0, sizeof(*tlv)); 1095 1096 /* Parse TLVs from the decrypted Phase 2 data */ 1097 pos = wpabuf_mhead(decrypted); 1098 end = pos + wpabuf_len(decrypted); 1099 while (pos + 4 < end) { 1100 mandatory = pos[0] & 0x80; 1101 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1102 pos += 2; 1103 len = WPA_GET_BE16(pos); 1104 pos += 2; 1105 if (len > (size_t) (end - pos)) { 1106 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1107 return -1; 1108 } 1109 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1110 "TLV type %d length %u%s", 1111 tlv_type, (unsigned int) len, 1112 mandatory ? " (mandatory)" : ""); 1113 1114 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1115 if (res == -2) 1116 break; 1117 if (res < 0) { 1118 if (mandatory) { 1119 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1120 "mandatory TLV type %d", tlv_type); 1121 *resp = eap_fast_tlv_nak(0, tlv_type); 1122 break; 1123 } else { 1124 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1125 "unknown optional TLV type %d", 1126 tlv_type); 1127 } 1128 } 1129 1130 pos += len; 1131 } 1132 1133 return 0; 1134 } 1135 1136 1137 static int eap_fast_encrypt_response(struct eap_sm *sm, 1138 struct eap_fast_data *data, 1139 struct wpabuf *resp, 1140 u8 identifier, struct wpabuf **out_data) 1141 { 1142 if (resp == NULL) 1143 return 0; 1144 1145 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1146 resp); 1147 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1148 data->fast_version, identifier, 1149 resp, out_data)) { 1150 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1151 "frame"); 1152 } 1153 wpabuf_free(resp); 1154 1155 return 0; 1156 } 1157 1158 1159 static struct wpabuf * eap_fast_pac_request(void) 1160 { 1161 struct wpabuf *tmp; 1162 u8 *pos, *pos2; 1163 1164 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1165 sizeof(struct eap_tlv_request_action_tlv) + 1166 sizeof(struct eap_tlv_pac_type_tlv)); 1167 if (tmp == NULL) 1168 return NULL; 1169 1170 pos = wpabuf_put(tmp, 0); 1171 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1172 wpabuf_put(tmp, pos2 - pos); 1173 return tmp; 1174 } 1175 1176 1177 static int eap_fast_process_decrypted(struct eap_sm *sm, 1178 struct eap_fast_data *data, 1179 struct eap_method_ret *ret, 1180 u8 identifier, 1181 struct wpabuf *decrypted, 1182 struct wpabuf **out_data) 1183 { 1184 struct wpabuf *resp = NULL, *tmp; 1185 struct eap_fast_tlv_parse tlv; 1186 int failed = 0; 1187 1188 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1189 return 0; 1190 if (resp) 1191 return eap_fast_encrypt_response(sm, data, resp, 1192 identifier, out_data); 1193 1194 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1195 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1196 return eap_fast_encrypt_response(sm, data, resp, 1197 identifier, out_data); 1198 } 1199 1200 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1201 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1202 return eap_fast_encrypt_response(sm, data, resp, 1203 identifier, out_data); 1204 } 1205 1206 if (tlv.crypto_binding) { 1207 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1208 tlv.crypto_binding, 1209 tlv.crypto_binding_len); 1210 if (tmp == NULL) 1211 failed = 1; 1212 else 1213 resp = wpabuf_concat(resp, tmp); 1214 } 1215 1216 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1217 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1218 EAP_TLV_RESULT_SUCCESS, 1); 1219 resp = wpabuf_concat(resp, tmp); 1220 } 1221 1222 if (tlv.eap_payload_tlv) { 1223 tmp = eap_fast_process_eap_payload_tlv( 1224 sm, data, ret, tlv.eap_payload_tlv, 1225 tlv.eap_payload_tlv_len); 1226 resp = wpabuf_concat(resp, tmp); 1227 } 1228 1229 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1230 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1231 "acknowledging success"); 1232 failed = 1; 1233 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1234 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1235 tlv.pac_len); 1236 resp = wpabuf_concat(resp, tmp); 1237 } 1238 1239 if (data->current_pac == NULL && data->provisioning && 1240 !data->anon_provisioning && !tlv.pac && 1241 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1242 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1243 /* 1244 * Need to request Tunnel PAC when using authenticated 1245 * provisioning. 1246 */ 1247 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1248 tmp = eap_fast_pac_request(); 1249 resp = wpabuf_concat(resp, tmp); 1250 } 1251 1252 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1253 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1254 resp = wpabuf_concat(tmp, resp); 1255 } else if (failed) { 1256 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1257 resp = wpabuf_concat(tmp, resp); 1258 } 1259 1260 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1261 tlv.crypto_binding && data->phase2_success) { 1262 if (data->anon_provisioning) { 1263 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1264 "provisioning completed successfully."); 1265 ret->methodState = METHOD_DONE; 1266 ret->decision = DECISION_FAIL; 1267 sm->expected_failure = 1; 1268 } else { 1269 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1270 "completed successfully."); 1271 if (data->provisioning) 1272 ret->methodState = METHOD_MAY_CONT; 1273 else 1274 ret->methodState = METHOD_DONE; 1275 ret->decision = DECISION_UNCOND_SUCC; 1276 } 1277 } 1278 1279 if (resp == NULL) { 1280 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1281 "empty response packet"); 1282 resp = wpabuf_alloc(1); 1283 } 1284 1285 return eap_fast_encrypt_response(sm, data, resp, identifier, 1286 out_data); 1287 } 1288 1289 1290 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1291 struct eap_method_ret *ret, u8 identifier, 1292 const struct wpabuf *in_data, 1293 struct wpabuf **out_data) 1294 { 1295 struct wpabuf *in_decrypted; 1296 int res; 1297 1298 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1299 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1300 1301 if (data->pending_phase2_req) { 1302 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1303 "skip decryption and use old data"); 1304 /* Clear TLS reassembly state. */ 1305 eap_peer_tls_reset_input(&data->ssl); 1306 1307 in_decrypted = data->pending_phase2_req; 1308 data->pending_phase2_req = NULL; 1309 goto continue_req; 1310 } 1311 1312 if (wpabuf_len(in_data) == 0) { 1313 /* Received TLS ACK - requesting more fragments */ 1314 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1315 data->fast_version, 1316 identifier, NULL, out_data); 1317 } 1318 1319 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1320 if (res) 1321 return res; 1322 1323 continue_req: 1324 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1325 in_decrypted); 1326 1327 if (wpabuf_len(in_decrypted) < 4) { 1328 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1329 "TLV frame (len=%lu)", 1330 (unsigned long) wpabuf_len(in_decrypted)); 1331 wpabuf_free(in_decrypted); 1332 return -1; 1333 } 1334 1335 res = eap_fast_process_decrypted(sm, data, ret, identifier, 1336 in_decrypted, out_data); 1337 1338 wpabuf_free(in_decrypted); 1339 1340 return res; 1341 } 1342 1343 1344 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1345 { 1346 const u8 *a_id; 1347 const struct pac_tlv_hdr *hdr; 1348 1349 /* 1350 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1351 * supports both raw A-ID and one inside an A-ID TLV. 1352 */ 1353 a_id = buf; 1354 *id_len = len; 1355 if (len > sizeof(*hdr)) { 1356 int tlen; 1357 hdr = (const struct pac_tlv_hdr *) buf; 1358 tlen = be_to_host16(hdr->len); 1359 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1360 sizeof(*hdr) + tlen <= len) { 1361 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1362 "(Start)"); 1363 a_id = (const u8 *) (hdr + 1); 1364 *id_len = tlen; 1365 } 1366 } 1367 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1368 1369 return a_id; 1370 } 1371 1372 1373 static void eap_fast_select_pac(struct eap_fast_data *data, 1374 const u8 *a_id, size_t a_id_len) 1375 { 1376 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1377 PAC_TYPE_TUNNEL_PAC); 1378 if (data->current_pac == NULL) { 1379 /* 1380 * Tunnel PAC was not available for this A-ID. Try to use 1381 * Machine Authentication PAC, if one is available. 1382 */ 1383 data->current_pac = eap_fast_get_pac( 1384 data->pac, a_id, a_id_len, 1385 PAC_TYPE_MACHINE_AUTHENTICATION); 1386 } 1387 1388 if (data->current_pac) { 1389 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1390 "(PAC-Type %d)", data->current_pac->pac_type); 1391 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1392 data->current_pac->a_id_info, 1393 data->current_pac->a_id_info_len); 1394 } 1395 } 1396 1397 1398 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1399 struct eap_fast_data *data, 1400 struct eap_fast_pac *pac) 1401 { 1402 u8 *tlv; 1403 size_t tlv_len, olen; 1404 struct eap_tlv_hdr *ehdr; 1405 1406 olen = pac->pac_opaque_len; 1407 tlv_len = sizeof(*ehdr) + olen; 1408 tlv = os_malloc(tlv_len); 1409 if (tlv) { 1410 ehdr = (struct eap_tlv_hdr *) tlv; 1411 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1412 ehdr->length = host_to_be16(olen); 1413 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1414 } 1415 if (tlv == NULL || 1416 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1417 TLS_EXT_PAC_OPAQUE, 1418 tlv, tlv_len) < 0) { 1419 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1420 "extension"); 1421 os_free(tlv); 1422 return -1; 1423 } 1424 os_free(tlv); 1425 1426 return 0; 1427 } 1428 1429 1430 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1431 struct eap_fast_data *data) 1432 { 1433 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1434 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1435 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1436 "TLS extension"); 1437 return -1; 1438 } 1439 return 0; 1440 } 1441 1442 1443 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1444 struct eap_fast_data *data) 1445 { 1446 u8 ciphers[5]; 1447 int count = 0; 1448 1449 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1450 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1451 "provisioning TLS cipher suites"); 1452 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1453 } 1454 1455 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1456 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1457 "provisioning TLS cipher suites"); 1458 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1459 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1460 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1461 } 1462 1463 ciphers[count++] = TLS_CIPHER_NONE; 1464 1465 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1466 ciphers)) { 1467 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1468 "cipher suites for provisioning"); 1469 return -1; 1470 } 1471 1472 return 0; 1473 } 1474 1475 1476 static int eap_fast_process_start(struct eap_sm *sm, 1477 struct eap_fast_data *data, u8 flags, 1478 const u8 *pos, size_t left) 1479 { 1480 const u8 *a_id; 1481 size_t a_id_len; 1482 1483 /* EAP-FAST Version negotiation (section 3.1) */ 1484 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1485 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1486 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1487 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1488 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1489 data->fast_version); 1490 1491 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1492 eap_fast_select_pac(data, a_id, a_id_len); 1493 1494 if (data->resuming && data->current_pac) { 1495 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1496 "do not add PAC-Opaque to TLS ClientHello"); 1497 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1498 return -1; 1499 } else if (data->current_pac) { 1500 /* 1501 * PAC found for the A-ID and we are not resuming an old 1502 * session, so add PAC-Opaque extension to ClientHello. 1503 */ 1504 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1505 return -1; 1506 } else { 1507 /* No PAC found, so we must provision one. */ 1508 if (!data->provisioning_allowed) { 1509 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1510 "provisioning disabled"); 1511 return -1; 1512 } 1513 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1514 "starting provisioning"); 1515 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1516 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1517 return -1; 1518 data->provisioning = 1; 1519 } 1520 1521 return 0; 1522 } 1523 1524 1525 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1526 struct eap_method_ret *ret, 1527 const struct wpabuf *reqData) 1528 { 1529 const struct eap_hdr *req; 1530 size_t left; 1531 int res; 1532 u8 flags, id; 1533 struct wpabuf *resp; 1534 const u8 *pos; 1535 struct eap_fast_data *data = priv; 1536 struct wpabuf msg; 1537 1538 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1539 reqData, &left, &flags); 1540 if (pos == NULL) 1541 return NULL; 1542 1543 req = wpabuf_head(reqData); 1544 id = req->identifier; 1545 1546 if (flags & EAP_TLS_FLAGS_START) { 1547 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1548 return NULL; 1549 1550 left = 0; /* A-ID is not used in further packet processing */ 1551 } 1552 1553 wpabuf_set(&msg, pos, left); 1554 1555 resp = NULL; 1556 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1557 !data->resuming) { 1558 /* Process tunneled (encrypted) phase 2 data. */ 1559 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1560 if (res < 0) { 1561 ret->methodState = METHOD_DONE; 1562 ret->decision = DECISION_FAIL; 1563 /* 1564 * Ack possible Alert that may have caused failure in 1565 * decryption. 1566 */ 1567 res = 1; 1568 } 1569 } else { 1570 /* Continue processing TLS handshake (phase 1). */ 1571 res = eap_peer_tls_process_helper(sm, &data->ssl, 1572 EAP_TYPE_FAST, 1573 data->fast_version, id, &msg, 1574 &resp); 1575 1576 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1577 char cipher[80]; 1578 wpa_printf(MSG_DEBUG, 1579 "EAP-FAST: TLS done, proceed to Phase 2"); 1580 if (data->provisioning && 1581 (!(data->provisioning_allowed & 1582 EAP_FAST_PROV_AUTH) || 1583 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1584 cipher, sizeof(cipher)) < 0 || 1585 os_strstr(cipher, "ADH-") || 1586 os_strstr(cipher, "anon"))) { 1587 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1588 "anonymous (unauthenticated) " 1589 "provisioning"); 1590 data->anon_provisioning = 1; 1591 } else 1592 data->anon_provisioning = 0; 1593 data->resuming = 0; 1594 if (eap_fast_derive_keys(sm, data) < 0) { 1595 wpa_printf(MSG_DEBUG, 1596 "EAP-FAST: Could not derive keys"); 1597 ret->methodState = METHOD_DONE; 1598 ret->decision = DECISION_FAIL; 1599 wpabuf_free(resp); 1600 return NULL; 1601 } 1602 } 1603 1604 if (res == 2) { 1605 /* 1606 * Application data included in the handshake message. 1607 */ 1608 wpabuf_free(data->pending_phase2_req); 1609 data->pending_phase2_req = resp; 1610 resp = NULL; 1611 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1612 } 1613 } 1614 1615 if (res == 1) { 1616 wpabuf_free(resp); 1617 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1618 data->fast_version); 1619 } 1620 1621 return resp; 1622 } 1623 1624 1625 #if 0 /* FIX */ 1626 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1627 { 1628 struct eap_fast_data *data = priv; 1629 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1630 } 1631 1632 1633 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1634 { 1635 struct eap_fast_data *data = priv; 1636 os_free(data->key_block_p); 1637 data->key_block_p = NULL; 1638 wpabuf_free(data->pending_phase2_req); 1639 data->pending_phase2_req = NULL; 1640 } 1641 1642 1643 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1644 { 1645 struct eap_fast_data *data = priv; 1646 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1647 os_free(data); 1648 return NULL; 1649 } 1650 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1651 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1652 os_free(data->session_id); 1653 data->session_id = NULL; 1654 if (data->phase2_priv && data->phase2_method && 1655 data->phase2_method->init_for_reauth) 1656 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1657 data->phase2_success = 0; 1658 data->resuming = 1; 1659 data->provisioning = 0; 1660 data->anon_provisioning = 0; 1661 data->simck_idx = 0; 1662 return priv; 1663 } 1664 #endif 1665 1666 1667 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1668 size_t buflen, int verbose) 1669 { 1670 struct eap_fast_data *data = priv; 1671 int len, ret; 1672 1673 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1674 if (data->phase2_method) { 1675 ret = os_snprintf(buf + len, buflen - len, 1676 "EAP-FAST Phase2 method=%s\n", 1677 data->phase2_method->name); 1678 if (os_snprintf_error(buflen - len, ret)) 1679 return len; 1680 len += ret; 1681 } 1682 return len; 1683 } 1684 1685 1686 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1687 { 1688 struct eap_fast_data *data = priv; 1689 return data->success; 1690 } 1691 1692 1693 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1694 { 1695 struct eap_fast_data *data = priv; 1696 u8 *key; 1697 1698 if (!data->success) 1699 return NULL; 1700 1701 key = os_malloc(EAP_FAST_KEY_LEN); 1702 if (key == NULL) 1703 return NULL; 1704 1705 *len = EAP_FAST_KEY_LEN; 1706 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN); 1707 1708 return key; 1709 } 1710 1711 1712 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1713 { 1714 struct eap_fast_data *data = priv; 1715 u8 *id; 1716 1717 if (!data->success) 1718 return NULL; 1719 1720 id = os_malloc(data->id_len); 1721 if (id == NULL) 1722 return NULL; 1723 1724 *len = data->id_len; 1725 os_memcpy(id, data->session_id, data->id_len); 1726 1727 return id; 1728 } 1729 1730 1731 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1732 { 1733 struct eap_fast_data *data = priv; 1734 u8 *key; 1735 1736 if (!data->success) 1737 return NULL; 1738 1739 key = os_malloc(EAP_EMSK_LEN); 1740 if (key == NULL) 1741 return NULL; 1742 1743 *len = EAP_EMSK_LEN; 1744 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1745 1746 return key; 1747 } 1748 1749 1750 int eap_peer_fast_register(void) 1751 { 1752 struct eap_method *eap; 1753 int ret; 1754 1755 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1756 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1757 if (eap == NULL) 1758 return -1; 1759 1760 eap->init = eap_fast_init; 1761 eap->deinit = eap_fast_deinit; 1762 eap->process = eap_fast_process; 1763 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1764 eap->getKey = eap_fast_getKey; 1765 eap->getSessionId = eap_fast_get_session_id; 1766 eap->get_status = eap_fast_get_status; 1767 #if 0 1768 eap->has_reauth_data = eap_fast_has_reauth_data; 1769 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1770 eap->init_for_reauth = eap_fast_init_for_reauth; 1771 #endif 1772 eap->get_emsk = eap_fast_get_emsk; 1773 1774 ret = eap_peer_method_register(eap); 1775 if (ret) 1776 eap_peer_method_free(eap); 1777 return ret; 1778 } 1779
