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->init_phase2 = 1; 358 data->phase2_priv = data->phase2_method->init(sm); 359 sm->init_phase2 = 0; 360 sm->auth_challenge = NULL; 361 sm->peer_challenge = NULL; 362 363 return data->phase2_priv == NULL ? -1 : 0; 364 } 365 366 367 static int eap_fast_select_phase2_method(struct eap_fast_data *data, 368 int vendor, enum eap_type type) 369 { 370 size_t i; 371 372 /* TODO: TNC with anonymous provisioning; need to require both 373 * completed MSCHAPv2 and TNC */ 374 375 if (data->anon_provisioning && 376 (vendor != EAP_VENDOR_IETF || type != EAP_TYPE_MSCHAPV2)) { 377 wpa_printf(MSG_INFO, 378 "EAP-FAST: Only EAP-MSCHAPv2 is allowed during unauthenticated provisioning; reject phase2 type %u:%u", 379 vendor, type); 380 return -1; 381 } 382 383 #ifdef EAP_TNC 384 if (vendor == EAP_VENDOR_IETF && 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 != vendor || 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 (vendor != data->phase2_type.vendor || 410 type != data->phase2_type.method || 411 (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_NONE)) 412 return -1; 413 414 return 0; 415 } 416 417 418 static int eap_fast_phase2_request(struct eap_sm *sm, 419 struct eap_fast_data *data, 420 struct eap_method_ret *ret, 421 struct eap_hdr *hdr, 422 struct wpabuf **resp) 423 { 424 size_t len = be_to_host16(hdr->length); 425 u8 *pos; 426 struct eap_method_ret iret; 427 struct eap_peer_config *config = eap_get_config(sm); 428 struct wpabuf msg; 429 int vendor = EAP_VENDOR_IETF; 430 enum eap_type method; 431 432 if (len <= sizeof(struct eap_hdr)) { 433 wpa_printf(MSG_INFO, "EAP-FAST: too short " 434 "Phase 2 request (len=%lu)", (unsigned long) len); 435 return -1; 436 } 437 pos = (u8 *) (hdr + 1); 438 method = *pos; 439 if (method == EAP_TYPE_EXPANDED) { 440 if (len < sizeof(struct eap_hdr) + 8) { 441 wpa_printf(MSG_INFO, 442 "EAP-FAST: Too short Phase 2 request (expanded header) (len=%lu)", 443 (unsigned long) len); 444 return -1; 445 } 446 vendor = WPA_GET_BE24(pos + 1); 447 method = WPA_GET_BE32(pos + 4); 448 } 449 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%u:%u", 450 vendor, method); 451 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_IDENTITY) { 452 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 453 return 0; 454 } 455 456 if (data->phase2_priv && data->phase2_method && 457 (vendor != data->phase2_type.vendor || 458 method != data->phase2_type.method)) { 459 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 460 "deinitialize previous method"); 461 data->phase2_method->deinit(sm, data->phase2_priv); 462 data->phase2_method = NULL; 463 data->phase2_priv = NULL; 464 data->phase2_type.vendor = EAP_VENDOR_IETF; 465 data->phase2_type.method = EAP_TYPE_NONE; 466 } 467 468 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 469 data->phase2_type.method == EAP_TYPE_NONE && 470 eap_fast_select_phase2_method(data, vendor, method) < 0) { 471 if (eap_peer_tls_phase2_nak(data->phase2_types, 472 data->num_phase2_types, 473 hdr, resp)) 474 return -1; 475 return 0; 476 } 477 478 if ((data->phase2_priv == NULL && 479 eap_fast_init_phase2_method(sm, data) < 0) || 480 data->phase2_method == NULL) { 481 wpa_printf(MSG_INFO, 482 "EAP-FAST: Failed to initialize Phase 2 EAP method %u:%u", 483 vendor, method); 484 ret->methodState = METHOD_DONE; 485 ret->decision = DECISION_FAIL; 486 return -1; 487 } 488 489 os_memset(&iret, 0, sizeof(iret)); 490 wpabuf_set(&msg, hdr, len); 491 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 492 &msg); 493 if (*resp == NULL || 494 (iret.methodState == METHOD_DONE && 495 iret.decision == DECISION_FAIL)) { 496 ret->methodState = METHOD_DONE; 497 ret->decision = DECISION_FAIL; 498 } else if ((iret.methodState == METHOD_DONE || 499 iret.methodState == METHOD_MAY_CONT) && 500 (iret.decision == DECISION_UNCOND_SUCC || 501 iret.decision == DECISION_COND_SUCC)) { 502 data->phase2_success = 1; 503 } 504 505 if (*resp == NULL && config && 506 (config->pending_req_identity || config->pending_req_password || 507 config->pending_req_otp || config->pending_req_new_password || 508 config->pending_req_sim)) { 509 wpabuf_clear_free(data->pending_phase2_req); 510 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 511 } else if (*resp == NULL) 512 return -1; 513 514 return 0; 515 } 516 517 518 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 519 { 520 struct wpabuf *buf; 521 struct eap_tlv_nak_tlv *nak; 522 buf = wpabuf_alloc(sizeof(*nak)); 523 if (buf == NULL) 524 return NULL; 525 nak = wpabuf_put(buf, sizeof(*nak)); 526 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 527 nak->length = host_to_be16(6); 528 nak->vendor_id = host_to_be32(vendor_id); 529 nak->nak_type = host_to_be16(tlv_type); 530 return buf; 531 } 532 533 534 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 535 { 536 struct wpabuf *buf; 537 struct eap_tlv_intermediate_result_tlv *result; 538 buf = wpabuf_alloc(sizeof(*result)); 539 if (buf == NULL) 540 return NULL; 541 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 542 intermediate ? "Intermediate " : "", status); 543 result = wpabuf_put(buf, sizeof(*result)); 544 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 545 (intermediate ? 546 EAP_TLV_INTERMEDIATE_RESULT_TLV : 547 EAP_TLV_RESULT_TLV)); 548 result->length = host_to_be16(2); 549 result->status = host_to_be16(status); 550 return buf; 551 } 552 553 554 static struct wpabuf * eap_fast_tlv_pac_ack(void) 555 { 556 struct wpabuf *buf; 557 struct eap_tlv_result_tlv *res; 558 struct eap_tlv_pac_ack_tlv *ack; 559 560 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 561 if (buf == NULL) 562 return NULL; 563 564 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 565 ack = wpabuf_put(buf, sizeof(*ack)); 566 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 567 EAP_TLV_TYPE_MANDATORY); 568 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 569 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 570 ack->pac_len = host_to_be16(2); 571 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 572 573 return buf; 574 } 575 576 577 static struct wpabuf * eap_fast_process_eap_payload_tlv( 578 struct eap_sm *sm, struct eap_fast_data *data, 579 struct eap_method_ret *ret, 580 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 581 { 582 struct eap_hdr *hdr; 583 struct wpabuf *resp = NULL; 584 585 if (eap_payload_tlv_len < sizeof(*hdr)) { 586 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 587 "Payload TLV (len=%lu)", 588 (unsigned long) eap_payload_tlv_len); 589 return NULL; 590 } 591 592 hdr = (struct eap_hdr *) eap_payload_tlv; 593 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 594 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 595 "EAP Payload TLV"); 596 return NULL; 597 } 598 599 if (hdr->code != EAP_CODE_REQUEST) { 600 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 601 "Phase 2 EAP header", hdr->code); 602 return NULL; 603 } 604 605 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 606 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 607 "failed"); 608 return NULL; 609 } 610 611 return eap_fast_tlv_eap_payload(resp); 612 } 613 614 615 static int eap_fast_validate_crypto_binding( 616 struct eap_tlv_crypto_binding_tlv *_bind) 617 { 618 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 619 "Received Version %d SubType %d", 620 _bind->version, _bind->received_version, _bind->subtype); 621 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 622 _bind->nonce, sizeof(_bind->nonce)); 623 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 624 _bind->compound_mac, sizeof(_bind->compound_mac)); 625 626 if (_bind->version != EAP_FAST_VERSION || 627 _bind->received_version != EAP_FAST_VERSION || 628 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 629 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 630 "Crypto-Binding TLV: Version %d " 631 "Received Version %d SubType %d", 632 _bind->version, _bind->received_version, 633 _bind->subtype); 634 return -1; 635 } 636 637 return 0; 638 } 639 640 641 static void eap_fast_write_crypto_binding( 642 struct eap_tlv_crypto_binding_tlv *rbind, 643 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 644 { 645 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 646 EAP_TLV_CRYPTO_BINDING_TLV); 647 rbind->length = host_to_be16(sizeof(*rbind) - 648 sizeof(struct eap_tlv_hdr)); 649 rbind->version = EAP_FAST_VERSION; 650 rbind->received_version = _bind->version; 651 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 652 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 653 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 654 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 655 rbind->compound_mac); 656 657 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 658 "Received Version %d SubType %d", 659 rbind->version, rbind->received_version, rbind->subtype); 660 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 661 rbind->nonce, sizeof(rbind->nonce)); 662 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 663 rbind->compound_mac, sizeof(rbind->compound_mac)); 664 } 665 666 667 static int eap_fast_get_phase2_key(struct eap_sm *sm, 668 struct eap_fast_data *data, 669 u8 *isk, size_t isk_len) 670 { 671 u8 *key; 672 size_t key_len; 673 674 os_memset(isk, 0, isk_len); 675 676 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 677 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 678 "available"); 679 return -1; 680 } 681 682 if (data->phase2_method->isKeyAvailable == NULL || 683 data->phase2_method->getKey == NULL) 684 return 0; 685 686 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 687 (key = data->phase2_method->getKey(sm, data->phase2_priv, 688 &key_len)) == NULL) { 689 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 690 "from Phase 2"); 691 return -1; 692 } 693 694 if (key_len > isk_len) 695 key_len = isk_len; 696 if (key_len == 32 && 697 data->phase2_method->vendor == EAP_VENDOR_IETF && 698 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 699 /* 700 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 701 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 702 * ISK for EAP-FAST cryptobinding. 703 */ 704 os_memcpy(isk, key + 16, 16); 705 os_memcpy(isk + 16, key, 16); 706 } else 707 os_memcpy(isk, key, key_len); 708 os_free(key); 709 710 return 0; 711 } 712 713 714 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 715 u8 *cmk) 716 { 717 u8 isk[32], imck[60]; 718 719 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 720 "calculation", data->simck_idx + 1); 721 722 /* 723 * RFC 4851, Section 5.2: 724 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 725 * MSK[j], 60) 726 * S-IMCK[j] = first 40 octets of IMCK[j] 727 * CMK[j] = last 20 octets of IMCK[j] 728 */ 729 730 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 731 return -1; 732 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 733 if (sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 734 "Inner Methods Compound Keys", 735 isk, sizeof(isk), imck, sizeof(imck)) < 0) 736 return -1; 737 data->simck_idx++; 738 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 739 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 740 data->simck, EAP_FAST_SIMCK_LEN); 741 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 742 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 743 cmk, EAP_FAST_CMK_LEN); 744 745 return 0; 746 } 747 748 749 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 750 { 751 struct eap_tlv_hdr *pac; 752 struct eap_tlv_request_action_tlv *act; 753 struct eap_tlv_pac_type_tlv *type; 754 755 act = (struct eap_tlv_request_action_tlv *) pos; 756 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 757 act->length = host_to_be16(2); 758 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 759 760 pac = (struct eap_tlv_hdr *) (act + 1); 761 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 762 pac->length = host_to_be16(sizeof(*type)); 763 764 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 765 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 766 type->length = host_to_be16(2); 767 type->pac_type = host_to_be16(pac_type); 768 769 return (u8 *) (type + 1); 770 } 771 772 773 static struct wpabuf * eap_fast_process_crypto_binding( 774 struct eap_sm *sm, struct eap_fast_data *data, 775 struct eap_method_ret *ret, 776 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 777 { 778 struct wpabuf *resp; 779 u8 *pos; 780 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 781 int res; 782 size_t len; 783 784 if (eap_fast_validate_crypto_binding(_bind) < 0) 785 return NULL; 786 787 if (eap_fast_get_cmk(sm, data, cmk) < 0) 788 return NULL; 789 790 /* Validate received Compound MAC */ 791 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 792 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 793 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 794 "MAC calculation", (u8 *) _bind, bind_len); 795 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 796 _bind->compound_mac); 797 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 798 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 799 cmac, sizeof(cmac)); 800 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 801 _bind->compound_mac, sizeof(cmac)); 802 if (res != 0) { 803 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 804 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 805 return NULL; 806 } 807 808 /* 809 * Compound MAC was valid, so authentication succeeded. Reply with 810 * crypto binding to allow server to complete authentication. 811 */ 812 813 len = sizeof(struct eap_tlv_crypto_binding_tlv); 814 resp = wpabuf_alloc(len); 815 if (resp == NULL) 816 return NULL; 817 818 if (!data->anon_provisioning && data->phase2_success && 819 eap_fast_derive_msk(data) < 0) { 820 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 821 ret->methodState = METHOD_DONE; 822 ret->decision = DECISION_FAIL; 823 data->phase2_success = 0; 824 wpabuf_clear_free(resp); 825 return NULL; 826 } 827 828 if (!data->anon_provisioning && data->phase2_success) { 829 os_free(data->session_id); 830 data->session_id = eap_peer_tls_derive_session_id( 831 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 832 if (data->session_id) { 833 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 834 data->session_id, data->id_len); 835 } else { 836 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 837 "Session-Id"); 838 wpabuf_clear_free(resp); 839 return NULL; 840 } 841 } 842 843 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 844 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 845 pos, _bind, cmk); 846 847 return resp; 848 } 849 850 851 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 852 u8 *pos, size_t len, int *pac_key_found) 853 { 854 switch (type & 0x7fff) { 855 case PAC_TYPE_PAC_KEY: 856 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 857 if (len != EAP_FAST_PAC_KEY_LEN) { 858 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 859 "length %lu", (unsigned long) len); 860 break; 861 } 862 *pac_key_found = 1; 863 os_memcpy(entry->pac_key, pos, len); 864 break; 865 case PAC_TYPE_PAC_OPAQUE: 866 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 867 entry->pac_opaque = pos; 868 entry->pac_opaque_len = len; 869 break; 870 case PAC_TYPE_PAC_INFO: 871 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 872 entry->pac_info = pos; 873 entry->pac_info_len = len; 874 break; 875 default: 876 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 877 type); 878 break; 879 } 880 } 881 882 883 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 884 u8 *pac, size_t pac_len) 885 { 886 struct pac_tlv_hdr *hdr; 887 u8 *pos; 888 size_t left, len; 889 int type, pac_key_found = 0; 890 891 pos = pac; 892 left = pac_len; 893 894 while (left > sizeof(*hdr)) { 895 hdr = (struct pac_tlv_hdr *) pos; 896 type = be_to_host16(hdr->type); 897 len = be_to_host16(hdr->len); 898 pos += sizeof(*hdr); 899 left -= sizeof(*hdr); 900 if (len > left) { 901 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 902 "(type=%d len=%lu left=%lu)", 903 type, (unsigned long) len, 904 (unsigned long) left); 905 return -1; 906 } 907 908 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 909 910 pos += len; 911 left -= len; 912 } 913 914 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 915 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 916 "all the required fields"); 917 return -1; 918 } 919 920 return 0; 921 } 922 923 924 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 925 u8 *pos, size_t len) 926 { 927 u16 pac_type; 928 u32 lifetime; 929 struct os_time now; 930 931 switch (type & 0x7fff) { 932 case PAC_TYPE_CRED_LIFETIME: 933 if (len != 4) { 934 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 935 "Invalid CRED_LIFETIME length - ignored", 936 pos, len); 937 return 0; 938 } 939 940 /* 941 * This is not currently saved separately in PAC files since 942 * the server can automatically initiate PAC update when 943 * needed. Anyway, the information is available from PAC-Info 944 * dump if it is needed for something in the future. 945 */ 946 lifetime = WPA_GET_BE32(pos); 947 os_get_time(&now); 948 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 949 "(%d days)", 950 lifetime, (lifetime - (u32) now.sec) / 86400); 951 break; 952 case PAC_TYPE_A_ID: 953 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 954 pos, len); 955 entry->a_id = pos; 956 entry->a_id_len = len; 957 break; 958 case PAC_TYPE_I_ID: 959 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 960 pos, len); 961 entry->i_id = pos; 962 entry->i_id_len = len; 963 break; 964 case PAC_TYPE_A_ID_INFO: 965 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 966 pos, len); 967 entry->a_id_info = pos; 968 entry->a_id_info_len = len; 969 break; 970 case PAC_TYPE_PAC_TYPE: 971 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 972 if (len != 2) { 973 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 974 "length %lu (expected 2)", 975 (unsigned long) len); 976 wpa_hexdump_ascii(MSG_DEBUG, 977 "EAP-FAST: PAC-Info - PAC-Type", 978 pos, len); 979 return -1; 980 } 981 pac_type = WPA_GET_BE16(pos); 982 if (pac_type != PAC_TYPE_TUNNEL_PAC && 983 pac_type != PAC_TYPE_USER_AUTHORIZATION && 984 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 985 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 986 "%d", pac_type); 987 return -1; 988 } 989 990 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 991 pac_type); 992 entry->pac_type = pac_type; 993 break; 994 default: 995 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 996 "type %d", type); 997 break; 998 } 999 1000 return 0; 1001 } 1002 1003 1004 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 1005 { 1006 struct pac_tlv_hdr *hdr; 1007 u8 *pos; 1008 size_t left, len; 1009 int type; 1010 1011 /* RFC 5422, Section 4.2.4 */ 1012 1013 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 1014 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 1015 1016 pos = entry->pac_info; 1017 left = entry->pac_info_len; 1018 while (left > sizeof(*hdr)) { 1019 hdr = (struct pac_tlv_hdr *) pos; 1020 type = be_to_host16(hdr->type); 1021 len = be_to_host16(hdr->len); 1022 pos += sizeof(*hdr); 1023 left -= sizeof(*hdr); 1024 if (len > left) { 1025 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1026 "(type=%d len=%lu left=%lu)", 1027 type, (unsigned long) len, 1028 (unsigned long) left); 1029 return -1; 1030 } 1031 1032 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1033 return -1; 1034 1035 pos += len; 1036 left -= len; 1037 } 1038 1039 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1040 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1041 "all the required fields"); 1042 return -1; 1043 } 1044 1045 return 0; 1046 } 1047 1048 1049 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1050 struct eap_fast_data *data, 1051 struct eap_method_ret *ret, 1052 u8 *pac, size_t pac_len) 1053 { 1054 struct eap_peer_config *config = eap_get_config(sm); 1055 struct eap_fast_pac entry; 1056 1057 os_memset(&entry, 0, sizeof(entry)); 1058 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1059 eap_fast_process_pac_info(&entry)) 1060 return NULL; 1061 1062 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1063 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1064 if (data->use_pac_binary_format) 1065 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1066 else 1067 eap_fast_save_pac(sm, data->pac, config->pac_file); 1068 1069 if (data->provisioning) { 1070 if (data->anon_provisioning) { 1071 /* 1072 * Unauthenticated provisioning does not provide keying 1073 * material and must end with an EAP-Failure. 1074 * Authentication will be done separately after this. 1075 */ 1076 data->success = 0; 1077 ret->decision = DECISION_FAIL; 1078 } else { 1079 /* 1080 * Server may or may not allow authenticated 1081 * provisioning also for key generation. 1082 */ 1083 ret->decision = DECISION_COND_SUCC; 1084 } 1085 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1086 "- Provisioning completed successfully"); 1087 sm->expected_failure = 1; 1088 } else { 1089 /* 1090 * This is PAC refreshing, i.e., normal authentication that is 1091 * expected to be completed with an EAP-Success. However, 1092 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1093 * after protected success exchange in case of EAP-Fast 1094 * provisioning, so we better use DECISION_COND_SUCC here 1095 * instead of DECISION_UNCOND_SUCC. 1096 */ 1097 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1098 "- PAC refreshing completed successfully"); 1099 ret->decision = DECISION_COND_SUCC; 1100 } 1101 ret->methodState = METHOD_DONE; 1102 return eap_fast_tlv_pac_ack(); 1103 } 1104 1105 1106 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1107 struct eap_fast_tlv_parse *tlv, 1108 struct wpabuf **resp) 1109 { 1110 int mandatory, tlv_type, res; 1111 size_t len; 1112 u8 *pos, *end; 1113 1114 os_memset(tlv, 0, sizeof(*tlv)); 1115 1116 /* Parse TLVs from the decrypted Phase 2 data */ 1117 pos = wpabuf_mhead(decrypted); 1118 end = pos + wpabuf_len(decrypted); 1119 while (end - pos > 4) { 1120 mandatory = pos[0] & 0x80; 1121 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1122 pos += 2; 1123 len = WPA_GET_BE16(pos); 1124 pos += 2; 1125 if (len > (size_t) (end - pos)) { 1126 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1127 return -1; 1128 } 1129 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1130 "TLV type %d length %u%s", 1131 tlv_type, (unsigned int) len, 1132 mandatory ? " (mandatory)" : ""); 1133 1134 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1135 if (res == -2) 1136 break; 1137 if (res < 0) { 1138 if (mandatory) { 1139 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1140 "mandatory TLV type %d", tlv_type); 1141 *resp = eap_fast_tlv_nak(0, tlv_type); 1142 break; 1143 } else { 1144 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1145 "unknown optional TLV type %d", 1146 tlv_type); 1147 } 1148 } 1149 1150 pos += len; 1151 } 1152 1153 return 0; 1154 } 1155 1156 1157 static int eap_fast_encrypt_response(struct eap_sm *sm, 1158 struct eap_fast_data *data, 1159 struct wpabuf *resp, 1160 u8 identifier, struct wpabuf **out_data) 1161 { 1162 if (resp == NULL) 1163 return 0; 1164 1165 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1166 resp); 1167 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1168 data->fast_version, identifier, 1169 resp, out_data)) { 1170 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1171 "frame"); 1172 } 1173 wpabuf_clear_free(resp); 1174 1175 return 0; 1176 } 1177 1178 1179 static struct wpabuf * eap_fast_pac_request(void) 1180 { 1181 struct wpabuf *tmp; 1182 u8 *pos, *pos2; 1183 1184 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1185 sizeof(struct eap_tlv_request_action_tlv) + 1186 sizeof(struct eap_tlv_pac_type_tlv)); 1187 if (tmp == NULL) 1188 return NULL; 1189 1190 pos = wpabuf_put(tmp, 0); 1191 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1192 wpabuf_put(tmp, pos2 - pos); 1193 return tmp; 1194 } 1195 1196 1197 static int eap_fast_process_decrypted(struct eap_sm *sm, 1198 struct eap_fast_data *data, 1199 struct eap_method_ret *ret, 1200 u8 identifier, 1201 struct wpabuf *decrypted, 1202 struct wpabuf **out_data) 1203 { 1204 struct wpabuf *resp = NULL, *tmp; 1205 struct eap_fast_tlv_parse tlv; 1206 int failed = 0; 1207 1208 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1209 return 0; 1210 if (resp) 1211 return eap_fast_encrypt_response(sm, data, resp, 1212 identifier, out_data); 1213 1214 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1215 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1216 return eap_fast_encrypt_response(sm, data, resp, 1217 identifier, out_data); 1218 } 1219 1220 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1221 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1222 return eap_fast_encrypt_response(sm, data, resp, 1223 identifier, out_data); 1224 } 1225 1226 if (tlv.crypto_binding) { 1227 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1228 tlv.crypto_binding, 1229 tlv.crypto_binding_len); 1230 if (tmp == NULL) 1231 failed = 1; 1232 else 1233 resp = wpabuf_concat(resp, tmp); 1234 } 1235 1236 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1237 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1238 EAP_TLV_RESULT_SUCCESS, 1); 1239 resp = wpabuf_concat(resp, tmp); 1240 } 1241 1242 if (tlv.eap_payload_tlv) { 1243 tmp = eap_fast_process_eap_payload_tlv( 1244 sm, data, ret, tlv.eap_payload_tlv, 1245 tlv.eap_payload_tlv_len); 1246 resp = wpabuf_concat(resp, tmp); 1247 } 1248 1249 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1250 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1251 "acknowledging success"); 1252 failed = 1; 1253 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1254 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1255 tlv.pac_len); 1256 resp = wpabuf_concat(resp, tmp); 1257 } 1258 1259 if (data->current_pac == NULL && data->provisioning && 1260 !data->anon_provisioning && !tlv.pac && 1261 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1262 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1263 /* 1264 * Need to request Tunnel PAC when using authenticated 1265 * provisioning. 1266 */ 1267 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1268 tmp = eap_fast_pac_request(); 1269 resp = wpabuf_concat(resp, tmp); 1270 } 1271 1272 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1273 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1274 resp = wpabuf_concat(tmp, resp); 1275 } else if (failed) { 1276 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1277 resp = wpabuf_concat(tmp, resp); 1278 } 1279 1280 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1281 tlv.crypto_binding && data->phase2_success) { 1282 if (data->anon_provisioning) { 1283 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1284 "provisioning completed successfully."); 1285 ret->methodState = METHOD_DONE; 1286 ret->decision = DECISION_FAIL; 1287 sm->expected_failure = 1; 1288 } else { 1289 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1290 "completed successfully."); 1291 if (data->provisioning) 1292 ret->methodState = METHOD_MAY_CONT; 1293 else 1294 ret->methodState = METHOD_DONE; 1295 ret->decision = DECISION_UNCOND_SUCC; 1296 } 1297 } 1298 1299 if (resp == NULL) { 1300 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1301 "empty response packet"); 1302 resp = wpabuf_alloc(1); 1303 } 1304 1305 return eap_fast_encrypt_response(sm, data, resp, identifier, 1306 out_data); 1307 } 1308 1309 1310 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1311 struct eap_method_ret *ret, u8 identifier, 1312 const struct wpabuf *in_data, 1313 struct wpabuf **out_data) 1314 { 1315 struct wpabuf *in_decrypted; 1316 int res; 1317 1318 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1319 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1320 1321 if (data->pending_phase2_req) { 1322 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1323 "skip decryption and use old data"); 1324 /* Clear TLS reassembly state. */ 1325 eap_peer_tls_reset_input(&data->ssl); 1326 1327 in_decrypted = data->pending_phase2_req; 1328 data->pending_phase2_req = NULL; 1329 goto continue_req; 1330 } 1331 1332 if (wpabuf_len(in_data) == 0) { 1333 /* Received TLS ACK - requesting more fragments */ 1334 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1335 data->fast_version, 1336 identifier, NULL, out_data); 1337 } 1338 1339 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1340 if (res) 1341 return res; 1342 1343 continue_req: 1344 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1345 in_decrypted); 1346 1347 if (wpabuf_len(in_decrypted) < 4) { 1348 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1349 "TLV frame (len=%lu)", 1350 (unsigned long) wpabuf_len(in_decrypted)); 1351 wpabuf_clear_free(in_decrypted); 1352 return -1; 1353 } 1354 1355 res = eap_fast_process_decrypted(sm, data, ret, identifier, 1356 in_decrypted, out_data); 1357 1358 wpabuf_clear_free(in_decrypted); 1359 1360 return res; 1361 } 1362 1363 1364 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1365 { 1366 const u8 *a_id; 1367 const struct pac_tlv_hdr *hdr; 1368 1369 /* 1370 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1371 * supports both raw A-ID and one inside an A-ID TLV. 1372 */ 1373 a_id = buf; 1374 *id_len = len; 1375 if (len > sizeof(*hdr)) { 1376 int tlen; 1377 hdr = (const struct pac_tlv_hdr *) buf; 1378 tlen = be_to_host16(hdr->len); 1379 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1380 sizeof(*hdr) + tlen <= len) { 1381 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1382 "(Start)"); 1383 a_id = (const u8 *) (hdr + 1); 1384 *id_len = tlen; 1385 } 1386 } 1387 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1388 1389 return a_id; 1390 } 1391 1392 1393 static void eap_fast_select_pac(struct eap_fast_data *data, 1394 const u8 *a_id, size_t a_id_len) 1395 { 1396 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1397 PAC_TYPE_TUNNEL_PAC); 1398 if (data->current_pac == NULL) { 1399 /* 1400 * Tunnel PAC was not available for this A-ID. Try to use 1401 * Machine Authentication PAC, if one is available. 1402 */ 1403 data->current_pac = eap_fast_get_pac( 1404 data->pac, a_id, a_id_len, 1405 PAC_TYPE_MACHINE_AUTHENTICATION); 1406 } 1407 1408 if (data->current_pac) { 1409 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1410 "(PAC-Type %d)", data->current_pac->pac_type); 1411 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1412 data->current_pac->a_id_info, 1413 data->current_pac->a_id_info_len); 1414 } 1415 } 1416 1417 1418 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1419 struct eap_fast_data *data, 1420 struct eap_fast_pac *pac) 1421 { 1422 u8 *tlv; 1423 size_t tlv_len, olen; 1424 struct eap_tlv_hdr *ehdr; 1425 1426 olen = pac->pac_opaque_len; 1427 tlv_len = sizeof(*ehdr) + olen; 1428 tlv = os_malloc(tlv_len); 1429 if (tlv) { 1430 ehdr = (struct eap_tlv_hdr *) tlv; 1431 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1432 ehdr->length = host_to_be16(olen); 1433 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1434 } 1435 if (tlv == NULL || 1436 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1437 TLS_EXT_PAC_OPAQUE, 1438 tlv, tlv_len) < 0) { 1439 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1440 "extension"); 1441 os_free(tlv); 1442 return -1; 1443 } 1444 os_free(tlv); 1445 1446 return 0; 1447 } 1448 1449 1450 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1451 struct eap_fast_data *data) 1452 { 1453 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1454 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1455 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1456 "TLS extension"); 1457 return -1; 1458 } 1459 return 0; 1460 } 1461 1462 1463 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1464 struct eap_fast_data *data) 1465 { 1466 u8 ciphers[7]; 1467 int count = 0; 1468 1469 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1470 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1471 "provisioning TLS cipher suites"); 1472 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1473 } 1474 1475 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1476 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1477 "provisioning TLS cipher suites"); 1478 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA; 1479 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1480 ciphers[count++] = TLS_CIPHER_AES256_SHA; 1481 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1482 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1483 } 1484 1485 ciphers[count++] = TLS_CIPHER_NONE; 1486 1487 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1488 ciphers)) { 1489 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1490 "cipher suites for provisioning"); 1491 return -1; 1492 } 1493 1494 return 0; 1495 } 1496 1497 1498 static int eap_fast_process_start(struct eap_sm *sm, 1499 struct eap_fast_data *data, u8 flags, 1500 const u8 *pos, size_t left) 1501 { 1502 const u8 *a_id; 1503 size_t a_id_len; 1504 1505 /* EAP-FAST Version negotiation (section 3.1) */ 1506 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1507 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1508 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1509 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1510 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1511 data->fast_version); 1512 1513 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1514 eap_fast_select_pac(data, a_id, a_id_len); 1515 1516 if (data->resuming && data->current_pac) { 1517 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1518 "do not add PAC-Opaque to TLS ClientHello"); 1519 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1520 return -1; 1521 } else if (data->current_pac) { 1522 /* 1523 * PAC found for the A-ID and we are not resuming an old 1524 * session, so add PAC-Opaque extension to ClientHello. 1525 */ 1526 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1527 return -1; 1528 } else { 1529 /* No PAC found, so we must provision one. */ 1530 if (!data->provisioning_allowed) { 1531 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1532 "provisioning disabled"); 1533 return -1; 1534 } 1535 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1536 "starting provisioning"); 1537 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1538 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1539 return -1; 1540 data->provisioning = 1; 1541 } 1542 1543 return 0; 1544 } 1545 1546 1547 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1548 struct eap_method_ret *ret, 1549 const struct wpabuf *reqData) 1550 { 1551 const struct eap_hdr *req; 1552 size_t left; 1553 int res; 1554 u8 flags, id; 1555 struct wpabuf *resp; 1556 const u8 *pos; 1557 struct eap_fast_data *data = priv; 1558 struct wpabuf msg; 1559 1560 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1561 reqData, &left, &flags); 1562 if (pos == NULL) 1563 return NULL; 1564 1565 req = wpabuf_head(reqData); 1566 id = req->identifier; 1567 1568 if (flags & EAP_TLS_FLAGS_START) { 1569 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1570 return NULL; 1571 1572 left = 0; /* A-ID is not used in further packet processing */ 1573 } 1574 1575 wpabuf_set(&msg, pos, left); 1576 1577 resp = NULL; 1578 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1579 !data->resuming) { 1580 /* Process tunneled (encrypted) phase 2 data. */ 1581 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1582 if (res < 0) { 1583 ret->methodState = METHOD_DONE; 1584 ret->decision = DECISION_FAIL; 1585 /* 1586 * Ack possible Alert that may have caused failure in 1587 * decryption. 1588 */ 1589 res = 1; 1590 } 1591 } else { 1592 if (sm->waiting_ext_cert_check && data->pending_resp) { 1593 struct eap_peer_config *config = eap_get_config(sm); 1594 1595 if (config->pending_ext_cert_check == 1596 EXT_CERT_CHECK_GOOD) { 1597 wpa_printf(MSG_DEBUG, 1598 "EAP-FAST: External certificate check succeeded - continue handshake"); 1599 resp = data->pending_resp; 1600 data->pending_resp = NULL; 1601 sm->waiting_ext_cert_check = 0; 1602 return resp; 1603 } 1604 1605 if (config->pending_ext_cert_check == 1606 EXT_CERT_CHECK_BAD) { 1607 wpa_printf(MSG_DEBUG, 1608 "EAP-FAST: External certificate check failed - force authentication failure"); 1609 ret->methodState = METHOD_DONE; 1610 ret->decision = DECISION_FAIL; 1611 sm->waiting_ext_cert_check = 0; 1612 return NULL; 1613 } 1614 1615 wpa_printf(MSG_DEBUG, 1616 "EAP-FAST: Continuing to wait external server certificate validation"); 1617 return NULL; 1618 } 1619 1620 /* Continue processing TLS handshake (phase 1). */ 1621 res = eap_peer_tls_process_helper(sm, &data->ssl, 1622 EAP_TYPE_FAST, 1623 data->fast_version, id, &msg, 1624 &resp); 1625 if (res < 0) { 1626 wpa_printf(MSG_DEBUG, 1627 "EAP-FAST: TLS processing failed"); 1628 ret->methodState = METHOD_DONE; 1629 ret->decision = DECISION_FAIL; 1630 return resp; 1631 } 1632 1633 if (sm->waiting_ext_cert_check) { 1634 wpa_printf(MSG_DEBUG, 1635 "EAP-FAST: Waiting external server certificate validation"); 1636 wpabuf_clear_free(data->pending_resp); 1637 data->pending_resp = resp; 1638 return NULL; 1639 } 1640 1641 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1642 char cipher[80]; 1643 wpa_printf(MSG_DEBUG, 1644 "EAP-FAST: TLS done, proceed to Phase 2"); 1645 if (data->provisioning && 1646 (!(data->provisioning_allowed & 1647 EAP_FAST_PROV_AUTH) || 1648 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1649 cipher, sizeof(cipher)) < 0 || 1650 os_strstr(cipher, "ADH-") || 1651 os_strstr(cipher, "anon"))) { 1652 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1653 "anonymous (unauthenticated) " 1654 "provisioning"); 1655 data->anon_provisioning = 1; 1656 } else 1657 data->anon_provisioning = 0; 1658 data->resuming = 0; 1659 if (eap_fast_derive_keys(sm, data) < 0) { 1660 wpa_printf(MSG_DEBUG, 1661 "EAP-FAST: Could not derive keys"); 1662 ret->methodState = METHOD_DONE; 1663 ret->decision = DECISION_FAIL; 1664 wpabuf_clear_free(resp); 1665 return NULL; 1666 } 1667 } 1668 1669 if (res == 2) { 1670 /* 1671 * Application data included in the handshake message. 1672 */ 1673 wpabuf_clear_free(data->pending_phase2_req); 1674 data->pending_phase2_req = resp; 1675 resp = NULL; 1676 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1677 } 1678 } 1679 1680 if (res == 1) { 1681 wpabuf_clear_free(resp); 1682 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1683 data->fast_version); 1684 } 1685 1686 return resp; 1687 } 1688 1689 1690 #if 0 /* FIX */ 1691 static bool eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1692 { 1693 struct eap_fast_data *data = priv; 1694 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1695 } 1696 1697 1698 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1699 { 1700 struct eap_fast_data *data = priv; 1701 1702 if (data->phase2_priv && data->phase2_method && 1703 data->phase2_method->deinit_for_reauth) 1704 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv); 1705 os_free(data->key_block_p); 1706 data->key_block_p = NULL; 1707 wpabuf_clear_free(data->pending_phase2_req); 1708 data->pending_phase2_req = NULL; 1709 wpabuf_clear_free(data->pending_resp); 1710 data->pending_resp = NULL; 1711 } 1712 1713 1714 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1715 { 1716 struct eap_fast_data *data = priv; 1717 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1718 os_free(data); 1719 return NULL; 1720 } 1721 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1722 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1723 os_free(data->session_id); 1724 data->session_id = NULL; 1725 if (data->phase2_priv && data->phase2_method && 1726 data->phase2_method->init_for_reauth) 1727 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1728 data->phase2_success = 0; 1729 data->resuming = 1; 1730 data->provisioning = 0; 1731 data->anon_provisioning = 0; 1732 data->simck_idx = 0; 1733 return priv; 1734 } 1735 #endif 1736 1737 1738 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1739 size_t buflen, int verbose) 1740 { 1741 struct eap_fast_data *data = priv; 1742 int len, ret; 1743 1744 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1745 if (data->phase2_method) { 1746 ret = os_snprintf(buf + len, buflen - len, 1747 "EAP-FAST Phase2 method=%s\n", 1748 data->phase2_method->name); 1749 if (os_snprintf_error(buflen - len, ret)) 1750 return len; 1751 len += ret; 1752 } 1753 return len; 1754 } 1755 1756 1757 static bool eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1758 { 1759 struct eap_fast_data *data = priv; 1760 return data->success; 1761 } 1762 1763 1764 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1765 { 1766 struct eap_fast_data *data = priv; 1767 u8 *key; 1768 1769 if (!data->success) 1770 return NULL; 1771 1772 key = os_memdup(data->key_data, EAP_FAST_KEY_LEN); 1773 if (key == NULL) 1774 return NULL; 1775 1776 *len = EAP_FAST_KEY_LEN; 1777 1778 return key; 1779 } 1780 1781 1782 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1783 { 1784 struct eap_fast_data *data = priv; 1785 u8 *id; 1786 1787 if (!data->success || !data->session_id) 1788 return NULL; 1789 1790 id = os_memdup(data->session_id, data->id_len); 1791 if (id == NULL) 1792 return NULL; 1793 1794 *len = data->id_len; 1795 1796 return id; 1797 } 1798 1799 1800 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1801 { 1802 struct eap_fast_data *data = priv; 1803 u8 *key; 1804 1805 if (!data->success) 1806 return NULL; 1807 1808 key = os_memdup(data->emsk, EAP_EMSK_LEN); 1809 if (key == NULL) 1810 return NULL; 1811 1812 *len = EAP_EMSK_LEN; 1813 1814 return key; 1815 } 1816 1817 1818 int eap_peer_fast_register(void) 1819 { 1820 struct eap_method *eap; 1821 1822 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1823 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1824 if (eap == NULL) 1825 return -1; 1826 1827 eap->init = eap_fast_init; 1828 eap->deinit = eap_fast_deinit; 1829 eap->process = eap_fast_process; 1830 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1831 eap->getKey = eap_fast_getKey; 1832 eap->getSessionId = eap_fast_get_session_id; 1833 eap->get_status = eap_fast_get_status; 1834 #if 0 1835 eap->has_reauth_data = eap_fast_has_reauth_data; 1836 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1837 eap->init_for_reauth = eap_fast_init_for_reauth; 1838 #endif 1839 eap->get_emsk = eap_fast_get_emsk; 1840 1841 return eap_peer_method_register(eap); 1842 } 1843