1 /* 2 * EAP peer method: EAP-FAST (RFC 4851) 3 * Copyright (c) 2004-2015, Jouni Malinen <j@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 struct wpabuf *pending_resp; 71 }; 72 73 74 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 75 const u8 *client_random, 76 const u8 *server_random, 77 u8 *master_secret) 78 { 79 struct eap_fast_data *data = ctx; 80 81 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 82 83 if (client_random == NULL || server_random == NULL || 84 master_secret == NULL) { 85 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall " 86 "back to full TLS handshake"); 87 data->session_ticket_used = 0; 88 if (data->provisioning_allowed) { 89 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a " 90 "new PAC-Key"); 91 data->provisioning = 1; 92 data->current_pac = NULL; 93 } 94 return 0; 95 } 96 97 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len); 98 99 if (data->current_pac == NULL) { 100 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for " 101 "using SessionTicket"); 102 data->session_ticket_used = 0; 103 return 0; 104 } 105 106 eap_fast_derive_master_secret(data->current_pac->pac_key, 107 server_random, client_random, 108 master_secret); 109 110 data->session_ticket_used = 1; 111 112 return 1; 113 } 114 115 116 static void eap_fast_parse_phase1(struct eap_fast_data *data, 117 const char *phase1) 118 { 119 const char *pos; 120 121 pos = os_strstr(phase1, "fast_provisioning="); 122 if (pos) { 123 data->provisioning_allowed = atoi(pos + 18); 124 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning " 125 "mode: %d", data->provisioning_allowed); 126 } 127 128 pos = os_strstr(phase1, "fast_max_pac_list_len="); 129 if (pos) { 130 data->max_pac_list_len = atoi(pos + 22); 131 if (data->max_pac_list_len == 0) 132 data->max_pac_list_len = 1; 133 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu", 134 (unsigned long) data->max_pac_list_len); 135 } 136 137 pos = os_strstr(phase1, "fast_pac_format=binary"); 138 if (pos) { 139 data->use_pac_binary_format = 1; 140 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC " 141 "list"); 142 } 143 } 144 145 146 static void * eap_fast_init(struct eap_sm *sm) 147 { 148 struct eap_fast_data *data; 149 struct eap_peer_config *config = eap_get_config(sm); 150 151 if (config == NULL) 152 return NULL; 153 154 data = os_zalloc(sizeof(*data)); 155 if (data == NULL) 156 return NULL; 157 data->fast_version = EAP_FAST_VERSION; 158 data->max_pac_list_len = 10; 159 160 if (config->phase1) 161 eap_fast_parse_phase1(data, config->phase1); 162 163 if (eap_peer_select_phase2_methods(config, "auth=", 164 &data->phase2_types, 165 &data->num_phase2_types, 0) < 0) { 166 eap_fast_deinit(sm, data); 167 return NULL; 168 } 169 170 data->phase2_type.vendor = EAP_VENDOR_IETF; 171 data->phase2_type.method = EAP_TYPE_NONE; 172 173 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) { 174 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 175 eap_fast_deinit(sm, data); 176 return NULL; 177 } 178 179 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 180 eap_fast_session_ticket_cb, 181 data) < 0) { 182 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 183 "callback"); 184 eap_fast_deinit(sm, data); 185 return NULL; 186 } 187 188 /* 189 * The local RADIUS server in a Cisco AP does not seem to like empty 190 * fragments before data, so disable that workaround for CBC. 191 * TODO: consider making this configurable 192 */ 193 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) { 194 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS " 195 "workarounds"); 196 } 197 198 if (!config->pac_file) { 199 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured"); 200 eap_fast_deinit(sm, data); 201 return NULL; 202 } 203 204 if (data->use_pac_binary_format && 205 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) { 206 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 207 eap_fast_deinit(sm, data); 208 return NULL; 209 } 210 211 if (!data->use_pac_binary_format && 212 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) { 213 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 214 eap_fast_deinit(sm, data); 215 return NULL; 216 } 217 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 218 219 if (data->pac == NULL && !data->provisioning_allowed) { 220 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and " 221 "provisioning disabled"); 222 eap_fast_deinit(sm, data); 223 return NULL; 224 } 225 226 return data; 227 } 228 229 230 static void eap_fast_deinit(struct eap_sm *sm, void *priv) 231 { 232 struct eap_fast_data *data = priv; 233 struct eap_fast_pac *pac, *prev; 234 235 if (data == NULL) 236 return; 237 if (data->phase2_priv && data->phase2_method) 238 data->phase2_method->deinit(sm, data->phase2_priv); 239 os_free(data->phase2_types); 240 os_free(data->key_block_p); 241 eap_peer_tls_ssl_deinit(sm, &data->ssl); 242 243 pac = data->pac; 244 prev = NULL; 245 while (pac) { 246 prev = pac; 247 pac = pac->next; 248 eap_fast_free_pac(prev); 249 } 250 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 251 os_memset(data->emsk, 0, EAP_EMSK_LEN); 252 os_free(data->session_id); 253 wpabuf_clear_free(data->pending_phase2_req); 254 wpabuf_clear_free(data->pending_resp); 255 os_free(data); 256 } 257 258 259 static int eap_fast_derive_msk(struct eap_fast_data *data) 260 { 261 if (eap_fast_derive_eap_msk(data->simck, data->key_data) < 0 || 262 eap_fast_derive_eap_emsk(data->simck, data->emsk) < 0) 263 return -1; 264 data->success = 1; 265 return 0; 266 } 267 268 269 static int eap_fast_derive_key_auth(struct eap_sm *sm, 270 struct eap_fast_data *data) 271 { 272 u8 *sks; 273 274 /* RFC 4851, Section 5.1: 275 * Extra key material after TLS key_block: session_key_seed[40] 276 */ 277 278 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 279 EAP_FAST_SKS_LEN); 280 if (sks == NULL) { 281 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 282 "session_key_seed"); 283 return -1; 284 } 285 286 /* 287 * RFC 4851, Section 5.2: 288 * S-IMCK[0] = session_key_seed 289 */ 290 wpa_hexdump_key(MSG_DEBUG, 291 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 292 sks, EAP_FAST_SKS_LEN); 293 data->simck_idx = 0; 294 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 295 os_free(sks); 296 return 0; 297 } 298 299 300 static int eap_fast_derive_key_provisioning(struct eap_sm *sm, 301 struct eap_fast_data *data) 302 { 303 os_free(data->key_block_p); 304 data->key_block_p = (struct eap_fast_key_block_provisioning *) 305 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 306 sizeof(*data->key_block_p)); 307 if (data->key_block_p == NULL) { 308 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 309 return -1; 310 } 311 /* 312 * RFC 4851, Section 5.2: 313 * S-IMCK[0] = session_key_seed 314 */ 315 wpa_hexdump_key(MSG_DEBUG, 316 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 317 data->key_block_p->session_key_seed, 318 sizeof(data->key_block_p->session_key_seed)); 319 data->simck_idx = 0; 320 os_memcpy(data->simck, data->key_block_p->session_key_seed, 321 EAP_FAST_SIMCK_LEN); 322 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 323 data->key_block_p->server_challenge, 324 sizeof(data->key_block_p->server_challenge)); 325 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 326 data->key_block_p->client_challenge, 327 sizeof(data->key_block_p->client_challenge)); 328 return 0; 329 } 330 331 332 static int eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 333 { 334 int res; 335 336 if (data->anon_provisioning) 337 res = eap_fast_derive_key_provisioning(sm, data); 338 else 339 res = eap_fast_derive_key_auth(sm, data); 340 return res; 341 } 342 343 344 static int eap_fast_init_phase2_method(struct eap_sm *sm, 345 struct eap_fast_data *data) 346 { 347 data->phase2_method = 348 eap_peer_get_eap_method(data->phase2_type.vendor, 349 data->phase2_type.method); 350 if (data->phase2_method == NULL) 351 return -1; 352 353 if (data->key_block_p) { 354 sm->auth_challenge = data->key_block_p->server_challenge; 355 sm->peer_challenge = data->key_block_p->client_challenge; 356 } 357 sm->eap_fast_mschapv2 = true; 358 sm->init_phase2 = 1; 359 data->phase2_priv = data->phase2_method->init(sm); 360 sm->init_phase2 = 0; 361 sm->auth_challenge = NULL; 362 sm->peer_challenge = NULL; 363 364 return data->phase2_priv == NULL ? -1 : 0; 365 } 366 367 368 static int eap_fast_select_phase2_method(struct eap_fast_data *data, 369 int vendor, enum eap_type 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 && 377 (vendor != EAP_VENDOR_IETF || type != EAP_TYPE_MSCHAPV2)) { 378 wpa_printf(MSG_INFO, 379 "EAP-FAST: Only EAP-MSCHAPv2 is allowed during unauthenticated provisioning; reject phase2 type %u:%u", 380 vendor, type); 381 return -1; 382 } 383 384 #ifdef EAP_TNC 385 if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_TNC) { 386 data->phase2_type.vendor = EAP_VENDOR_IETF; 387 data->phase2_type.method = EAP_TYPE_TNC; 388 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 389 "vendor %d method %d for TNC", 390 data->phase2_type.vendor, 391 data->phase2_type.method); 392 return 0; 393 } 394 #endif /* EAP_TNC */ 395 396 for (i = 0; i < data->num_phase2_types; i++) { 397 if (data->phase2_types[i].vendor != vendor || 398 data->phase2_types[i].method != type) 399 continue; 400 401 data->phase2_type.vendor = data->phase2_types[i].vendor; 402 data->phase2_type.method = data->phase2_types[i].method; 403 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 404 "vendor %d method %d", 405 data->phase2_type.vendor, 406 data->phase2_type.method); 407 break; 408 } 409 410 if (vendor != data->phase2_type.vendor || 411 type != data->phase2_type.method || 412 (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_NONE)) 413 return -1; 414 415 return 0; 416 } 417 418 419 static int eap_fast_phase2_request(struct eap_sm *sm, 420 struct eap_fast_data *data, 421 struct eap_method_ret *ret, 422 struct eap_hdr *hdr, 423 struct wpabuf **resp) 424 { 425 size_t len = be_to_host16(hdr->length); 426 u8 *pos; 427 struct eap_method_ret iret; 428 struct eap_peer_config *config = eap_get_config(sm); 429 struct wpabuf msg; 430 int vendor = EAP_VENDOR_IETF; 431 enum eap_type method; 432 433 if (len <= sizeof(struct eap_hdr)) { 434 wpa_printf(MSG_INFO, "EAP-FAST: too short " 435 "Phase 2 request (len=%lu)", (unsigned long) len); 436 return -1; 437 } 438 pos = (u8 *) (hdr + 1); 439 method = *pos; 440 if (method == EAP_TYPE_EXPANDED) { 441 if (len < sizeof(struct eap_hdr) + 8) { 442 wpa_printf(MSG_INFO, 443 "EAP-FAST: Too short Phase 2 request (expanded header) (len=%lu)", 444 (unsigned long) len); 445 return -1; 446 } 447 vendor = WPA_GET_BE24(pos + 1); 448 method = WPA_GET_BE32(pos + 4); 449 } 450 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%u:%u", 451 vendor, method); 452 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_IDENTITY) { 453 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 454 return 0; 455 } 456 457 if (data->phase2_priv && data->phase2_method && 458 (vendor != data->phase2_type.vendor || 459 method != data->phase2_type.method)) { 460 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 461 "deinitialize previous method"); 462 data->phase2_method->deinit(sm, data->phase2_priv); 463 data->phase2_method = NULL; 464 data->phase2_priv = NULL; 465 data->phase2_type.vendor = EAP_VENDOR_IETF; 466 data->phase2_type.method = EAP_TYPE_NONE; 467 } 468 469 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 470 data->phase2_type.method == EAP_TYPE_NONE && 471 eap_fast_select_phase2_method(data, vendor, method) < 0) { 472 if (eap_peer_tls_phase2_nak(data->phase2_types, 473 data->num_phase2_types, 474 hdr, resp)) 475 return -1; 476 return 0; 477 } 478 479 if ((data->phase2_priv == NULL && 480 eap_fast_init_phase2_method(sm, data) < 0) || 481 data->phase2_method == NULL) { 482 wpa_printf(MSG_INFO, 483 "EAP-FAST: Failed to initialize Phase 2 EAP method %u:%u", 484 vendor, method); 485 ret->methodState = METHOD_DONE; 486 ret->decision = DECISION_FAIL; 487 return -1; 488 } 489 490 os_memset(&iret, 0, sizeof(iret)); 491 wpabuf_set(&msg, hdr, len); 492 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 493 &msg); 494 if (*resp == NULL || 495 (iret.methodState == METHOD_DONE && 496 iret.decision == DECISION_FAIL)) { 497 ret->methodState = METHOD_DONE; 498 ret->decision = DECISION_FAIL; 499 } else if ((iret.methodState == METHOD_DONE || 500 iret.methodState == METHOD_MAY_CONT) && 501 (iret.decision == DECISION_UNCOND_SUCC || 502 iret.decision == DECISION_COND_SUCC)) { 503 data->phase2_success = 1; 504 } 505 506 if (*resp == NULL && config && 507 (config->pending_req_identity || config->pending_req_password || 508 config->pending_req_otp || config->pending_req_new_password || 509 config->pending_req_sim)) { 510 wpabuf_clear_free(data->pending_phase2_req); 511 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 512 } else if (*resp == NULL) 513 return -1; 514 515 return 0; 516 } 517 518 519 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 520 { 521 struct wpabuf *buf; 522 struct eap_tlv_nak_tlv *nak; 523 buf = wpabuf_alloc(sizeof(*nak)); 524 if (buf == NULL) 525 return NULL; 526 nak = wpabuf_put(buf, sizeof(*nak)); 527 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 528 nak->length = host_to_be16(6); 529 nak->vendor_id = host_to_be32(vendor_id); 530 nak->nak_type = host_to_be16(tlv_type); 531 return buf; 532 } 533 534 535 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 536 { 537 struct wpabuf *buf; 538 struct eap_tlv_intermediate_result_tlv *result; 539 buf = wpabuf_alloc(sizeof(*result)); 540 if (buf == NULL) 541 return NULL; 542 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 543 intermediate ? "Intermediate " : "", status); 544 result = wpabuf_put(buf, sizeof(*result)); 545 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 546 (intermediate ? 547 EAP_TLV_INTERMEDIATE_RESULT_TLV : 548 EAP_TLV_RESULT_TLV)); 549 result->length = host_to_be16(2); 550 result->status = host_to_be16(status); 551 return buf; 552 } 553 554 555 static struct wpabuf * eap_fast_tlv_pac_ack(void) 556 { 557 struct wpabuf *buf; 558 struct eap_tlv_result_tlv *res; 559 struct eap_tlv_pac_ack_tlv *ack; 560 561 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 562 if (buf == NULL) 563 return NULL; 564 565 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 566 ack = wpabuf_put(buf, sizeof(*ack)); 567 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 568 EAP_TLV_TYPE_MANDATORY); 569 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 570 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 571 ack->pac_len = host_to_be16(2); 572 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 573 574 return buf; 575 } 576 577 578 static struct wpabuf * eap_fast_process_eap_payload_tlv( 579 struct eap_sm *sm, struct eap_fast_data *data, 580 struct eap_method_ret *ret, 581 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 582 { 583 struct eap_hdr *hdr; 584 struct wpabuf *resp = NULL; 585 586 if (eap_payload_tlv_len < sizeof(*hdr)) { 587 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 588 "Payload TLV (len=%lu)", 589 (unsigned long) eap_payload_tlv_len); 590 return NULL; 591 } 592 593 hdr = (struct eap_hdr *) eap_payload_tlv; 594 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 595 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 596 "EAP Payload TLV"); 597 return NULL; 598 } 599 600 if (hdr->code != EAP_CODE_REQUEST) { 601 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 602 "Phase 2 EAP header", hdr->code); 603 return NULL; 604 } 605 606 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 607 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 608 "failed"); 609 return NULL; 610 } 611 612 return eap_fast_tlv_eap_payload(resp); 613 } 614 615 616 static int eap_fast_validate_crypto_binding( 617 struct eap_tlv_crypto_binding_tlv *_bind) 618 { 619 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 620 "Received Version %d SubType %d", 621 _bind->version, _bind->received_version, _bind->subtype); 622 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 623 _bind->nonce, sizeof(_bind->nonce)); 624 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 625 _bind->compound_mac, sizeof(_bind->compound_mac)); 626 627 if (_bind->version != EAP_FAST_VERSION || 628 _bind->received_version != EAP_FAST_VERSION || 629 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 630 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 631 "Crypto-Binding TLV: Version %d " 632 "Received Version %d SubType %d", 633 _bind->version, _bind->received_version, 634 _bind->subtype); 635 return -1; 636 } 637 638 return 0; 639 } 640 641 642 static void eap_fast_write_crypto_binding( 643 struct eap_tlv_crypto_binding_tlv *rbind, 644 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 645 { 646 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 647 EAP_TLV_CRYPTO_BINDING_TLV); 648 rbind->length = host_to_be16(sizeof(*rbind) - 649 sizeof(struct eap_tlv_hdr)); 650 rbind->version = EAP_FAST_VERSION; 651 rbind->received_version = _bind->version; 652 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 653 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 654 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 655 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 656 rbind->compound_mac); 657 658 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 659 "Received Version %d SubType %d", 660 rbind->version, rbind->received_version, rbind->subtype); 661 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 662 rbind->nonce, sizeof(rbind->nonce)); 663 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 664 rbind->compound_mac, sizeof(rbind->compound_mac)); 665 } 666 667 668 static int eap_fast_get_phase2_key(struct eap_sm *sm, 669 struct eap_fast_data *data, 670 u8 *isk, size_t isk_len) 671 { 672 u8 *key; 673 size_t key_len; 674 675 os_memset(isk, 0, isk_len); 676 677 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 678 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 679 "available"); 680 return -1; 681 } 682 683 if (data->phase2_method->isKeyAvailable == NULL || 684 data->phase2_method->getKey == NULL) 685 return 0; 686 687 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 688 (key = data->phase2_method->getKey(sm, data->phase2_priv, 689 &key_len)) == NULL) { 690 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 691 "from Phase 2"); 692 return -1; 693 } 694 695 if (key_len > isk_len) 696 key_len = isk_len; 697 os_memcpy(isk, key, key_len); 698 os_free(key); 699 700 return 0; 701 } 702 703 704 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 705 u8 *cmk) 706 { 707 u8 isk[32], imck[60]; 708 709 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 710 "calculation", data->simck_idx + 1); 711 712 /* 713 * RFC 4851, Section 5.2: 714 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 715 * MSK[j], 60) 716 * S-IMCK[j] = first 40 octets of IMCK[j] 717 * CMK[j] = last 20 octets of IMCK[j] 718 */ 719 720 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 721 return -1; 722 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 723 if (sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 724 "Inner Methods Compound Keys", 725 isk, sizeof(isk), imck, sizeof(imck)) < 0) 726 return -1; 727 data->simck_idx++; 728 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 729 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 730 data->simck, EAP_FAST_SIMCK_LEN); 731 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 732 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 733 cmk, EAP_FAST_CMK_LEN); 734 735 return 0; 736 } 737 738 739 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 740 { 741 struct eap_tlv_hdr *pac; 742 struct eap_tlv_request_action_tlv *act; 743 struct eap_tlv_pac_type_tlv *type; 744 745 act = (struct eap_tlv_request_action_tlv *) pos; 746 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 747 act->length = host_to_be16(2); 748 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 749 750 pac = (struct eap_tlv_hdr *) (act + 1); 751 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 752 pac->length = host_to_be16(sizeof(*type)); 753 754 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 755 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 756 type->length = host_to_be16(2); 757 type->pac_type = host_to_be16(pac_type); 758 759 return (u8 *) (type + 1); 760 } 761 762 763 static struct wpabuf * eap_fast_process_crypto_binding( 764 struct eap_sm *sm, struct eap_fast_data *data, 765 struct eap_method_ret *ret, 766 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 767 { 768 struct wpabuf *resp; 769 u8 *pos; 770 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 771 int res; 772 size_t len; 773 774 if (eap_fast_validate_crypto_binding(_bind) < 0) 775 return NULL; 776 777 if (eap_fast_get_cmk(sm, data, cmk) < 0) 778 return NULL; 779 780 /* Validate received Compound MAC */ 781 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 782 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 783 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 784 "MAC calculation", (u8 *) _bind, bind_len); 785 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 786 _bind->compound_mac); 787 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 788 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 789 cmac, sizeof(cmac)); 790 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 791 _bind->compound_mac, sizeof(cmac)); 792 if (res != 0) { 793 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 794 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 795 return NULL; 796 } 797 798 /* 799 * Compound MAC was valid, so authentication succeeded. Reply with 800 * crypto binding to allow server to complete authentication. 801 */ 802 803 len = sizeof(struct eap_tlv_crypto_binding_tlv); 804 resp = wpabuf_alloc(len); 805 if (resp == NULL) 806 return NULL; 807 808 if (!data->anon_provisioning && data->phase2_success && 809 eap_fast_derive_msk(data) < 0) { 810 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 811 ret->methodState = METHOD_DONE; 812 ret->decision = DECISION_FAIL; 813 data->phase2_success = 0; 814 wpabuf_clear_free(resp); 815 return NULL; 816 } 817 818 if (!data->anon_provisioning && data->phase2_success) { 819 os_free(data->session_id); 820 data->session_id = eap_peer_tls_derive_session_id( 821 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 822 if (data->session_id) { 823 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 824 data->session_id, data->id_len); 825 } else { 826 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 827 "Session-Id"); 828 wpabuf_clear_free(resp); 829 return NULL; 830 } 831 } 832 833 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 834 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 835 pos, _bind, cmk); 836 837 return resp; 838 } 839 840 841 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 842 u8 *pos, size_t len, int *pac_key_found) 843 { 844 switch (type & 0x7fff) { 845 case PAC_TYPE_PAC_KEY: 846 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 847 if (len != EAP_FAST_PAC_KEY_LEN) { 848 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 849 "length %lu", (unsigned long) len); 850 break; 851 } 852 *pac_key_found = 1; 853 os_memcpy(entry->pac_key, pos, len); 854 break; 855 case PAC_TYPE_PAC_OPAQUE: 856 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 857 entry->pac_opaque = pos; 858 entry->pac_opaque_len = len; 859 break; 860 case PAC_TYPE_PAC_INFO: 861 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 862 entry->pac_info = pos; 863 entry->pac_info_len = len; 864 break; 865 default: 866 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 867 type); 868 break; 869 } 870 } 871 872 873 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 874 u8 *pac, size_t pac_len) 875 { 876 struct pac_tlv_hdr *hdr; 877 u8 *pos; 878 size_t left, len; 879 int type, pac_key_found = 0; 880 881 pos = pac; 882 left = pac_len; 883 884 while (left > sizeof(*hdr)) { 885 hdr = (struct pac_tlv_hdr *) pos; 886 type = be_to_host16(hdr->type); 887 len = be_to_host16(hdr->len); 888 pos += sizeof(*hdr); 889 left -= sizeof(*hdr); 890 if (len > left) { 891 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 892 "(type=%d len=%lu left=%lu)", 893 type, (unsigned long) len, 894 (unsigned long) left); 895 return -1; 896 } 897 898 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 899 900 pos += len; 901 left -= len; 902 } 903 904 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 905 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 906 "all the required fields"); 907 return -1; 908 } 909 910 return 0; 911 } 912 913 914 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 915 u8 *pos, size_t len) 916 { 917 u16 pac_type; 918 u32 lifetime; 919 struct os_time now; 920 921 switch (type & 0x7fff) { 922 case PAC_TYPE_CRED_LIFETIME: 923 if (len != 4) { 924 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 925 "Invalid CRED_LIFETIME length - ignored", 926 pos, len); 927 return 0; 928 } 929 930 /* 931 * This is not currently saved separately in PAC files since 932 * the server can automatically initiate PAC update when 933 * needed. Anyway, the information is available from PAC-Info 934 * dump if it is needed for something in the future. 935 */ 936 lifetime = WPA_GET_BE32(pos); 937 os_get_time(&now); 938 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 939 "(%d days)", 940 lifetime, (lifetime - (u32) now.sec) / 86400); 941 break; 942 case PAC_TYPE_A_ID: 943 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 944 pos, len); 945 entry->a_id = pos; 946 entry->a_id_len = len; 947 break; 948 case PAC_TYPE_I_ID: 949 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 950 pos, len); 951 entry->i_id = pos; 952 entry->i_id_len = len; 953 break; 954 case PAC_TYPE_A_ID_INFO: 955 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 956 pos, len); 957 entry->a_id_info = pos; 958 entry->a_id_info_len = len; 959 break; 960 case PAC_TYPE_PAC_TYPE: 961 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 962 if (len != 2) { 963 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 964 "length %lu (expected 2)", 965 (unsigned long) len); 966 wpa_hexdump_ascii(MSG_DEBUG, 967 "EAP-FAST: PAC-Info - PAC-Type", 968 pos, len); 969 return -1; 970 } 971 pac_type = WPA_GET_BE16(pos); 972 if (pac_type != PAC_TYPE_TUNNEL_PAC && 973 pac_type != PAC_TYPE_USER_AUTHORIZATION && 974 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 975 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 976 "%d", pac_type); 977 return -1; 978 } 979 980 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 981 pac_type); 982 entry->pac_type = pac_type; 983 break; 984 default: 985 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 986 "type %d", type); 987 break; 988 } 989 990 return 0; 991 } 992 993 994 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 995 { 996 struct pac_tlv_hdr *hdr; 997 u8 *pos; 998 size_t left, len; 999 int type; 1000 1001 /* RFC 5422, Section 4.2.4 */ 1002 1003 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 1004 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 1005 1006 pos = entry->pac_info; 1007 left = entry->pac_info_len; 1008 while (left > sizeof(*hdr)) { 1009 hdr = (struct pac_tlv_hdr *) pos; 1010 type = be_to_host16(hdr->type); 1011 len = be_to_host16(hdr->len); 1012 pos += sizeof(*hdr); 1013 left -= sizeof(*hdr); 1014 if (len > left) { 1015 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1016 "(type=%d len=%lu left=%lu)", 1017 type, (unsigned long) len, 1018 (unsigned long) left); 1019 return -1; 1020 } 1021 1022 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1023 return -1; 1024 1025 pos += len; 1026 left -= len; 1027 } 1028 1029 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1030 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1031 "all the required fields"); 1032 return -1; 1033 } 1034 1035 return 0; 1036 } 1037 1038 1039 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1040 struct eap_fast_data *data, 1041 struct eap_method_ret *ret, 1042 u8 *pac, size_t pac_len) 1043 { 1044 struct eap_peer_config *config = eap_get_config(sm); 1045 struct eap_fast_pac entry; 1046 1047 os_memset(&entry, 0, sizeof(entry)); 1048 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1049 eap_fast_process_pac_info(&entry)) 1050 return NULL; 1051 1052 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1053 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1054 if (data->use_pac_binary_format) 1055 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1056 else 1057 eap_fast_save_pac(sm, data->pac, config->pac_file); 1058 1059 if (data->provisioning) { 1060 if (data->anon_provisioning) { 1061 /* 1062 * Unauthenticated provisioning does not provide keying 1063 * material and must end with an EAP-Failure. 1064 * Authentication will be done separately after this. 1065 */ 1066 data->success = 0; 1067 ret->decision = DECISION_FAIL; 1068 } else { 1069 /* 1070 * Server may or may not allow authenticated 1071 * provisioning also for key generation. 1072 */ 1073 ret->decision = DECISION_COND_SUCC; 1074 } 1075 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1076 "- Provisioning completed successfully"); 1077 sm->expected_failure = 1; 1078 } else { 1079 /* 1080 * This is PAC refreshing, i.e., normal authentication that is 1081 * expected to be completed with an EAP-Success. However, 1082 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1083 * after protected success exchange in case of EAP-Fast 1084 * provisioning, so we better use DECISION_COND_SUCC here 1085 * instead of DECISION_UNCOND_SUCC. 1086 */ 1087 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1088 "- PAC refreshing completed successfully"); 1089 ret->decision = DECISION_COND_SUCC; 1090 } 1091 ret->methodState = METHOD_DONE; 1092 return eap_fast_tlv_pac_ack(); 1093 } 1094 1095 1096 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1097 struct eap_fast_tlv_parse *tlv, 1098 struct wpabuf **resp) 1099 { 1100 int mandatory, tlv_type, res; 1101 size_t len; 1102 u8 *pos, *end; 1103 1104 os_memset(tlv, 0, sizeof(*tlv)); 1105 1106 /* Parse TLVs from the decrypted Phase 2 data */ 1107 pos = wpabuf_mhead(decrypted); 1108 end = pos + wpabuf_len(decrypted); 1109 while (end - pos > 4) { 1110 mandatory = pos[0] & 0x80; 1111 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1112 pos += 2; 1113 len = WPA_GET_BE16(pos); 1114 pos += 2; 1115 if (len > (size_t) (end - pos)) { 1116 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1117 return -1; 1118 } 1119 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1120 "TLV type %d length %u%s", 1121 tlv_type, (unsigned int) len, 1122 mandatory ? " (mandatory)" : ""); 1123 1124 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1125 if (res == -2) 1126 break; 1127 if (res < 0) { 1128 if (mandatory) { 1129 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1130 "mandatory TLV type %d", tlv_type); 1131 *resp = eap_fast_tlv_nak(0, tlv_type); 1132 break; 1133 } else { 1134 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1135 "unknown optional TLV type %d", 1136 tlv_type); 1137 } 1138 } 1139 1140 pos += len; 1141 } 1142 1143 return 0; 1144 } 1145 1146 1147 static int eap_fast_encrypt_response(struct eap_sm *sm, 1148 struct eap_fast_data *data, 1149 struct wpabuf *resp, 1150 u8 identifier, struct wpabuf **out_data) 1151 { 1152 if (resp == NULL) 1153 return 0; 1154 1155 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1156 resp); 1157 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1158 data->fast_version, identifier, 1159 resp, out_data)) { 1160 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1161 "frame"); 1162 } 1163 wpabuf_clear_free(resp); 1164 1165 return 0; 1166 } 1167 1168 1169 static struct wpabuf * eap_fast_pac_request(void) 1170 { 1171 struct wpabuf *tmp; 1172 u8 *pos, *pos2; 1173 1174 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1175 sizeof(struct eap_tlv_request_action_tlv) + 1176 sizeof(struct eap_tlv_pac_type_tlv)); 1177 if (tmp == NULL) 1178 return NULL; 1179 1180 pos = wpabuf_put(tmp, 0); 1181 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1182 wpabuf_put(tmp, pos2 - pos); 1183 return tmp; 1184 } 1185 1186 1187 static int eap_fast_process_decrypted(struct eap_sm *sm, 1188 struct eap_fast_data *data, 1189 struct eap_method_ret *ret, 1190 u8 identifier, 1191 struct wpabuf *decrypted, 1192 struct wpabuf **out_data) 1193 { 1194 struct wpabuf *resp = NULL, *tmp; 1195 struct eap_fast_tlv_parse tlv; 1196 int failed = 0; 1197 1198 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1199 return 0; 1200 if (resp) 1201 return eap_fast_encrypt_response(sm, data, resp, 1202 identifier, out_data); 1203 1204 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1205 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1206 return eap_fast_encrypt_response(sm, data, resp, 1207 identifier, out_data); 1208 } 1209 1210 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1211 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1212 return eap_fast_encrypt_response(sm, data, resp, 1213 identifier, out_data); 1214 } 1215 1216 if (tlv.crypto_binding) { 1217 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1218 tlv.crypto_binding, 1219 tlv.crypto_binding_len); 1220 if (tmp == NULL) 1221 failed = 1; 1222 else 1223 resp = wpabuf_concat(resp, tmp); 1224 } 1225 1226 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1227 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1228 EAP_TLV_RESULT_SUCCESS, 1); 1229 resp = wpabuf_concat(resp, tmp); 1230 } 1231 1232 if (tlv.eap_payload_tlv) { 1233 tmp = eap_fast_process_eap_payload_tlv( 1234 sm, data, ret, tlv.eap_payload_tlv, 1235 tlv.eap_payload_tlv_len); 1236 resp = wpabuf_concat(resp, tmp); 1237 } 1238 1239 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1240 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1241 "acknowledging success"); 1242 failed = 1; 1243 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1244 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1245 tlv.pac_len); 1246 resp = wpabuf_concat(resp, tmp); 1247 } 1248 1249 if (data->current_pac == NULL && data->provisioning && 1250 !data->anon_provisioning && !tlv.pac && 1251 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1252 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1253 /* 1254 * Need to request Tunnel PAC when using authenticated 1255 * provisioning. 1256 */ 1257 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1258 tmp = eap_fast_pac_request(); 1259 resp = wpabuf_concat(resp, tmp); 1260 } 1261 1262 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1263 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1264 resp = wpabuf_concat(tmp, resp); 1265 } else if (failed) { 1266 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1267 resp = wpabuf_concat(tmp, resp); 1268 } 1269 1270 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1271 tlv.crypto_binding && data->phase2_success) { 1272 if (data->anon_provisioning) { 1273 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1274 "provisioning completed successfully."); 1275 ret->methodState = METHOD_DONE; 1276 ret->decision = DECISION_FAIL; 1277 sm->expected_failure = 1; 1278 } else { 1279 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1280 "completed successfully."); 1281 if (data->provisioning) 1282 ret->methodState = METHOD_MAY_CONT; 1283 else 1284 ret->methodState = METHOD_DONE; 1285 ret->decision = DECISION_UNCOND_SUCC; 1286 } 1287 } 1288 1289 if (resp == NULL) { 1290 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1291 "empty response packet"); 1292 resp = wpabuf_alloc(1); 1293 } 1294 1295 return eap_fast_encrypt_response(sm, data, resp, identifier, 1296 out_data); 1297 } 1298 1299 1300 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1301 struct eap_method_ret *ret, u8 identifier, 1302 const struct wpabuf *in_data, 1303 struct wpabuf **out_data) 1304 { 1305 struct wpabuf *in_decrypted; 1306 int res; 1307 1308 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1309 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1310 1311 if (data->pending_phase2_req) { 1312 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1313 "skip decryption and use old data"); 1314 /* Clear TLS reassembly state. */ 1315 eap_peer_tls_reset_input(&data->ssl); 1316 1317 in_decrypted = data->pending_phase2_req; 1318 data->pending_phase2_req = NULL; 1319 goto continue_req; 1320 } 1321 1322 if (wpabuf_len(in_data) == 0) { 1323 /* Received TLS ACK - requesting more fragments */ 1324 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1325 data->fast_version, 1326 identifier, NULL, out_data); 1327 } 1328 1329 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1330 if (res) 1331 return res; 1332 1333 continue_req: 1334 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1335 in_decrypted); 1336 1337 if (wpabuf_len(in_decrypted) < 4) { 1338 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1339 "TLV frame (len=%lu)", 1340 (unsigned long) wpabuf_len(in_decrypted)); 1341 wpabuf_clear_free(in_decrypted); 1342 return -1; 1343 } 1344 1345 res = eap_fast_process_decrypted(sm, data, ret, identifier, 1346 in_decrypted, out_data); 1347 1348 wpabuf_clear_free(in_decrypted); 1349 1350 return res; 1351 } 1352 1353 1354 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1355 { 1356 const u8 *a_id; 1357 const struct pac_tlv_hdr *hdr; 1358 1359 /* 1360 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1361 * supports both raw A-ID and one inside an A-ID TLV. 1362 */ 1363 a_id = buf; 1364 *id_len = len; 1365 if (len > sizeof(*hdr)) { 1366 int tlen; 1367 hdr = (const struct pac_tlv_hdr *) buf; 1368 tlen = be_to_host16(hdr->len); 1369 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1370 sizeof(*hdr) + tlen <= len) { 1371 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1372 "(Start)"); 1373 a_id = (const u8 *) (hdr + 1); 1374 *id_len = tlen; 1375 } 1376 } 1377 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1378 1379 return a_id; 1380 } 1381 1382 1383 static void eap_fast_select_pac(struct eap_fast_data *data, 1384 const u8 *a_id, size_t a_id_len) 1385 { 1386 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1387 PAC_TYPE_TUNNEL_PAC); 1388 if (data->current_pac == NULL) { 1389 /* 1390 * Tunnel PAC was not available for this A-ID. Try to use 1391 * Machine Authentication PAC, if one is available. 1392 */ 1393 data->current_pac = eap_fast_get_pac( 1394 data->pac, a_id, a_id_len, 1395 PAC_TYPE_MACHINE_AUTHENTICATION); 1396 } 1397 1398 if (data->current_pac) { 1399 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1400 "(PAC-Type %d)", data->current_pac->pac_type); 1401 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1402 data->current_pac->a_id_info, 1403 data->current_pac->a_id_info_len); 1404 } 1405 } 1406 1407 1408 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1409 struct eap_fast_data *data, 1410 struct eap_fast_pac *pac) 1411 { 1412 u8 *tlv; 1413 size_t tlv_len, olen; 1414 struct eap_tlv_hdr *ehdr; 1415 1416 olen = pac->pac_opaque_len; 1417 tlv_len = sizeof(*ehdr) + olen; 1418 tlv = os_malloc(tlv_len); 1419 if (tlv) { 1420 ehdr = (struct eap_tlv_hdr *) tlv; 1421 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1422 ehdr->length = host_to_be16(olen); 1423 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1424 } 1425 if (tlv == NULL || 1426 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1427 TLS_EXT_PAC_OPAQUE, 1428 tlv, tlv_len) < 0) { 1429 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1430 "extension"); 1431 os_free(tlv); 1432 return -1; 1433 } 1434 os_free(tlv); 1435 1436 return 0; 1437 } 1438 1439 1440 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1441 struct eap_fast_data *data) 1442 { 1443 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1444 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1445 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1446 "TLS extension"); 1447 return -1; 1448 } 1449 return 0; 1450 } 1451 1452 1453 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1454 struct eap_fast_data *data) 1455 { 1456 u8 ciphers[7]; 1457 int count = 0; 1458 1459 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1460 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1461 "provisioning TLS cipher suites"); 1462 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1463 } 1464 1465 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1466 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1467 "provisioning TLS cipher suites"); 1468 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA; 1469 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1470 ciphers[count++] = TLS_CIPHER_AES256_SHA; 1471 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1472 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1473 } 1474 1475 ciphers[count++] = TLS_CIPHER_NONE; 1476 1477 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1478 ciphers)) { 1479 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1480 "cipher suites for provisioning"); 1481 return -1; 1482 } 1483 1484 return 0; 1485 } 1486 1487 1488 static int eap_fast_process_start(struct eap_sm *sm, 1489 struct eap_fast_data *data, u8 flags, 1490 const u8 *pos, size_t left) 1491 { 1492 const u8 *a_id; 1493 size_t a_id_len; 1494 1495 /* EAP-FAST Version negotiation (section 3.1) */ 1496 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1497 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1498 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1499 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1500 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1501 data->fast_version); 1502 1503 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1504 eap_fast_select_pac(data, a_id, a_id_len); 1505 1506 if (data->resuming && data->current_pac) { 1507 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1508 "do not add PAC-Opaque to TLS ClientHello"); 1509 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1510 return -1; 1511 } else if (data->current_pac) { 1512 /* 1513 * PAC found for the A-ID and we are not resuming an old 1514 * session, so add PAC-Opaque extension to ClientHello. 1515 */ 1516 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1517 return -1; 1518 } else { 1519 /* No PAC found, so we must provision one. */ 1520 if (!data->provisioning_allowed) { 1521 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1522 "provisioning disabled"); 1523 return -1; 1524 } 1525 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1526 "starting provisioning"); 1527 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1528 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1529 return -1; 1530 data->provisioning = 1; 1531 } 1532 1533 return 0; 1534 } 1535 1536 1537 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1538 struct eap_method_ret *ret, 1539 const struct wpabuf *reqData) 1540 { 1541 const struct eap_hdr *req; 1542 size_t left; 1543 int res; 1544 u8 flags, id; 1545 struct wpabuf *resp; 1546 const u8 *pos; 1547 struct eap_fast_data *data = priv; 1548 struct wpabuf msg; 1549 1550 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1551 reqData, &left, &flags); 1552 if (pos == NULL) 1553 return NULL; 1554 1555 req = wpabuf_head(reqData); 1556 id = req->identifier; 1557 1558 if (flags & EAP_TLS_FLAGS_START) { 1559 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1560 return NULL; 1561 1562 left = 0; /* A-ID is not used in further packet processing */ 1563 } 1564 1565 wpabuf_set(&msg, pos, left); 1566 1567 resp = NULL; 1568 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1569 !data->resuming) { 1570 /* Process tunneled (encrypted) phase 2 data. */ 1571 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1572 if (res < 0) { 1573 ret->methodState = METHOD_DONE; 1574 ret->decision = DECISION_FAIL; 1575 /* 1576 * Ack possible Alert that may have caused failure in 1577 * decryption. 1578 */ 1579 res = 1; 1580 } 1581 } else { 1582 if (sm->waiting_ext_cert_check && data->pending_resp) { 1583 struct eap_peer_config *config = eap_get_config(sm); 1584 1585 if (config->pending_ext_cert_check == 1586 EXT_CERT_CHECK_GOOD) { 1587 wpa_printf(MSG_DEBUG, 1588 "EAP-FAST: External certificate check succeeded - continue handshake"); 1589 resp = data->pending_resp; 1590 data->pending_resp = NULL; 1591 sm->waiting_ext_cert_check = 0; 1592 return resp; 1593 } 1594 1595 if (config->pending_ext_cert_check == 1596 EXT_CERT_CHECK_BAD) { 1597 wpa_printf(MSG_DEBUG, 1598 "EAP-FAST: External certificate check failed - force authentication failure"); 1599 ret->methodState = METHOD_DONE; 1600 ret->decision = DECISION_FAIL; 1601 sm->waiting_ext_cert_check = 0; 1602 return NULL; 1603 } 1604 1605 wpa_printf(MSG_DEBUG, 1606 "EAP-FAST: Continuing to wait external server certificate validation"); 1607 return NULL; 1608 } 1609 1610 /* Continue processing TLS handshake (phase 1). */ 1611 res = eap_peer_tls_process_helper(sm, &data->ssl, 1612 EAP_TYPE_FAST, 1613 data->fast_version, id, &msg, 1614 &resp); 1615 if (res < 0) { 1616 wpa_printf(MSG_DEBUG, 1617 "EAP-FAST: TLS processing failed"); 1618 ret->methodState = METHOD_DONE; 1619 ret->decision = DECISION_FAIL; 1620 return resp; 1621 } 1622 1623 if (sm->waiting_ext_cert_check) { 1624 wpa_printf(MSG_DEBUG, 1625 "EAP-FAST: Waiting external server certificate validation"); 1626 wpabuf_clear_free(data->pending_resp); 1627 data->pending_resp = resp; 1628 return NULL; 1629 } 1630 1631 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1632 char cipher[80]; 1633 wpa_printf(MSG_DEBUG, 1634 "EAP-FAST: TLS done, proceed to Phase 2"); 1635 if (data->provisioning && 1636 (!(data->provisioning_allowed & 1637 EAP_FAST_PROV_AUTH) || 1638 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1639 cipher, sizeof(cipher)) < 0 || 1640 os_strstr(cipher, "ADH-") || 1641 os_strstr(cipher, "anon"))) { 1642 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1643 "anonymous (unauthenticated) " 1644 "provisioning"); 1645 data->anon_provisioning = 1; 1646 } else 1647 data->anon_provisioning = 0; 1648 data->resuming = 0; 1649 if (eap_fast_derive_keys(sm, data) < 0) { 1650 wpa_printf(MSG_DEBUG, 1651 "EAP-FAST: Could not derive keys"); 1652 ret->methodState = METHOD_DONE; 1653 ret->decision = DECISION_FAIL; 1654 wpabuf_clear_free(resp); 1655 return NULL; 1656 } 1657 } 1658 1659 if (res == 2) { 1660 /* 1661 * Application data included in the handshake message. 1662 */ 1663 wpabuf_clear_free(data->pending_phase2_req); 1664 data->pending_phase2_req = resp; 1665 resp = NULL; 1666 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1667 } 1668 } 1669 1670 if (res == 1) { 1671 wpabuf_clear_free(resp); 1672 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1673 data->fast_version); 1674 } 1675 1676 return resp; 1677 } 1678 1679 1680 #if 0 /* FIX */ 1681 static bool eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1682 { 1683 struct eap_fast_data *data = priv; 1684 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1685 } 1686 1687 1688 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1689 { 1690 struct eap_fast_data *data = priv; 1691 1692 if (data->phase2_priv && data->phase2_method && 1693 data->phase2_method->deinit_for_reauth) 1694 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv); 1695 os_free(data->key_block_p); 1696 data->key_block_p = NULL; 1697 wpabuf_clear_free(data->pending_phase2_req); 1698 data->pending_phase2_req = NULL; 1699 wpabuf_clear_free(data->pending_resp); 1700 data->pending_resp = NULL; 1701 } 1702 1703 1704 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1705 { 1706 struct eap_fast_data *data = priv; 1707 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1708 os_free(data); 1709 return NULL; 1710 } 1711 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1712 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1713 os_free(data->session_id); 1714 data->session_id = NULL; 1715 if (data->phase2_priv && data->phase2_method && 1716 data->phase2_method->init_for_reauth) 1717 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1718 data->phase2_success = 0; 1719 data->resuming = 1; 1720 data->provisioning = 0; 1721 data->anon_provisioning = 0; 1722 data->simck_idx = 0; 1723 return priv; 1724 } 1725 #endif 1726 1727 1728 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1729 size_t buflen, int verbose) 1730 { 1731 struct eap_fast_data *data = priv; 1732 int len, ret; 1733 1734 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1735 if (data->phase2_method) { 1736 ret = os_snprintf(buf + len, buflen - len, 1737 "EAP-FAST Phase2 method=%s\n", 1738 data->phase2_method->name); 1739 if (os_snprintf_error(buflen - len, ret)) 1740 return len; 1741 len += ret; 1742 } 1743 return len; 1744 } 1745 1746 1747 static bool eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1748 { 1749 struct eap_fast_data *data = priv; 1750 return data->success; 1751 } 1752 1753 1754 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1755 { 1756 struct eap_fast_data *data = priv; 1757 u8 *key; 1758 1759 if (!data->success) 1760 return NULL; 1761 1762 key = os_memdup(data->key_data, EAP_FAST_KEY_LEN); 1763 if (key == NULL) 1764 return NULL; 1765 1766 *len = EAP_FAST_KEY_LEN; 1767 1768 return key; 1769 } 1770 1771 1772 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1773 { 1774 struct eap_fast_data *data = priv; 1775 u8 *id; 1776 1777 if (!data->success || !data->session_id) 1778 return NULL; 1779 1780 id = os_memdup(data->session_id, data->id_len); 1781 if (id == NULL) 1782 return NULL; 1783 1784 *len = data->id_len; 1785 1786 return id; 1787 } 1788 1789 1790 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1791 { 1792 struct eap_fast_data *data = priv; 1793 u8 *key; 1794 1795 if (!data->success) 1796 return NULL; 1797 1798 key = os_memdup(data->emsk, EAP_EMSK_LEN); 1799 if (key == NULL) 1800 return NULL; 1801 1802 *len = EAP_EMSK_LEN; 1803 1804 return key; 1805 } 1806 1807 1808 int eap_peer_fast_register(void) 1809 { 1810 struct eap_method *eap; 1811 1812 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1813 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1814 if (eap == NULL) 1815 return -1; 1816 1817 eap->init = eap_fast_init; 1818 eap->deinit = eap_fast_deinit; 1819 eap->process = eap_fast_process; 1820 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1821 eap->getKey = eap_fast_getKey; 1822 eap->getSessionId = eap_fast_get_session_id; 1823 eap->get_status = eap_fast_get_status; 1824 #if 0 1825 eap->has_reauth_data = eap_fast_has_reauth_data; 1826 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1827 eap->init_for_reauth = eap_fast_init_for_reauth; 1828 #endif 1829 eap->get_emsk = eap_fast_get_emsk; 1830 1831 return eap_peer_method_register(eap); 1832 } 1833