1 /* 2 * EAP peer method: EAP-FAST (RFC 4851) 3 * Copyright (c) 2004-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/tls.h" 13 #include "crypto/sha1.h" 14 #include "eap_common/eap_tlv_common.h" 15 #include "eap_i.h" 16 #include "eap_tls_common.h" 17 #include "eap_config.h" 18 #include "eap_fast_pac.h" 19 20 #ifdef EAP_FAST_DYNAMIC 21 #include "eap_fast_pac.c" 22 #endif /* EAP_FAST_DYNAMIC */ 23 24 /* TODO: 25 * - test session resumption and enable it if it interoperates 26 * - password change (pending mschapv2 packet; replay decrypted packet) 27 */ 28 29 30 static void eap_fast_deinit(struct eap_sm *sm, void *priv); 31 32 33 struct eap_fast_data { 34 struct eap_ssl_data ssl; 35 36 int fast_version; 37 38 const struct eap_method *phase2_method; 39 void *phase2_priv; 40 int phase2_success; 41 42 struct eap_method_type phase2_type; 43 struct eap_method_type *phase2_types; 44 size_t num_phase2_types; 45 int resuming; /* starting a resumed session */ 46 struct eap_fast_key_block_provisioning *key_block_p; 47 #define EAP_FAST_PROV_UNAUTH 1 48 #define EAP_FAST_PROV_AUTH 2 49 int provisioning_allowed; /* Allowed PAC provisioning modes */ 50 int provisioning; /* doing PAC provisioning (not the normal auth) */ 51 int anon_provisioning; /* doing anonymous (unauthenticated) 52 * provisioning */ 53 int session_ticket_used; 54 55 u8 key_data[EAP_FAST_KEY_LEN]; 56 u8 *session_id; 57 size_t id_len; 58 u8 emsk[EAP_EMSK_LEN]; 59 int success; 60 61 struct eap_fast_pac *pac; 62 struct eap_fast_pac *current_pac; 63 size_t max_pac_list_len; 64 int use_pac_binary_format; 65 66 u8 simck[EAP_FAST_SIMCK_LEN]; 67 int simck_idx; 68 69 struct wpabuf *pending_phase2_req; 70 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) { 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_free(data->pending_phase2_req); 254 wpabuf_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, "key expansion", 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 "key expansion", 307 sizeof(*data->key_block_p)); 308 if (data->key_block_p == NULL) { 309 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 310 return -1; 311 } 312 /* 313 * RFC 4851, Section 5.2: 314 * S-IMCK[0] = session_key_seed 315 */ 316 wpa_hexdump_key(MSG_DEBUG, 317 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 318 data->key_block_p->session_key_seed, 319 sizeof(data->key_block_p->session_key_seed)); 320 data->simck_idx = 0; 321 os_memcpy(data->simck, data->key_block_p->session_key_seed, 322 EAP_FAST_SIMCK_LEN); 323 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 324 data->key_block_p->server_challenge, 325 sizeof(data->key_block_p->server_challenge)); 326 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 327 data->key_block_p->client_challenge, 328 sizeof(data->key_block_p->client_challenge)); 329 return 0; 330 } 331 332 333 static int eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 334 { 335 int res; 336 337 if (data->anon_provisioning) 338 res = eap_fast_derive_key_provisioning(sm, data); 339 else 340 res = eap_fast_derive_key_auth(sm, data); 341 return res; 342 } 343 344 345 static int eap_fast_init_phase2_method(struct eap_sm *sm, 346 struct eap_fast_data *data) 347 { 348 data->phase2_method = 349 eap_peer_get_eap_method(data->phase2_type.vendor, 350 data->phase2_type.method); 351 if (data->phase2_method == NULL) 352 return -1; 353 354 if (data->key_block_p) { 355 sm->auth_challenge = data->key_block_p->server_challenge; 356 sm->peer_challenge = data->key_block_p->client_challenge; 357 } 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, u8 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 && type != EAP_TYPE_MSCHAPV2) { 376 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 377 "during unauthenticated provisioning; reject phase2" 378 " type %d", type); 379 return -1; 380 } 381 382 #ifdef EAP_TNC 383 if (type == EAP_TYPE_TNC) { 384 data->phase2_type.vendor = EAP_VENDOR_IETF; 385 data->phase2_type.method = EAP_TYPE_TNC; 386 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 387 "vendor %d method %d for TNC", 388 data->phase2_type.vendor, 389 data->phase2_type.method); 390 return 0; 391 } 392 #endif /* EAP_TNC */ 393 394 for (i = 0; i < data->num_phase2_types; i++) { 395 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 396 data->phase2_types[i].method != type) 397 continue; 398 399 data->phase2_type.vendor = data->phase2_types[i].vendor; 400 data->phase2_type.method = data->phase2_types[i].method; 401 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 402 "vendor %d method %d", 403 data->phase2_type.vendor, 404 data->phase2_type.method); 405 break; 406 } 407 408 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 409 return -1; 410 411 return 0; 412 } 413 414 415 static int eap_fast_phase2_request(struct eap_sm *sm, 416 struct eap_fast_data *data, 417 struct eap_method_ret *ret, 418 struct eap_hdr *hdr, 419 struct wpabuf **resp) 420 { 421 size_t len = be_to_host16(hdr->length); 422 u8 *pos; 423 struct eap_method_ret iret; 424 struct eap_peer_config *config = eap_get_config(sm); 425 struct wpabuf msg; 426 427 if (len <= sizeof(struct eap_hdr)) { 428 wpa_printf(MSG_INFO, "EAP-FAST: too short " 429 "Phase 2 request (len=%lu)", (unsigned long) len); 430 return -1; 431 } 432 pos = (u8 *) (hdr + 1); 433 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 434 if (*pos == EAP_TYPE_IDENTITY) { 435 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 436 return 0; 437 } 438 439 if (data->phase2_priv && data->phase2_method && 440 *pos != data->phase2_type.method) { 441 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 442 "deinitialize previous method"); 443 data->phase2_method->deinit(sm, data->phase2_priv); 444 data->phase2_method = NULL; 445 data->phase2_priv = NULL; 446 data->phase2_type.vendor = EAP_VENDOR_IETF; 447 data->phase2_type.method = EAP_TYPE_NONE; 448 } 449 450 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 451 data->phase2_type.method == EAP_TYPE_NONE && 452 eap_fast_select_phase2_method(data, *pos) < 0) { 453 if (eap_peer_tls_phase2_nak(data->phase2_types, 454 data->num_phase2_types, 455 hdr, resp)) 456 return -1; 457 return 0; 458 } 459 460 if ((data->phase2_priv == NULL && 461 eap_fast_init_phase2_method(sm, data) < 0) || 462 data->phase2_method == NULL) { 463 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 464 "Phase 2 EAP method %d", *pos); 465 ret->methodState = METHOD_DONE; 466 ret->decision = DECISION_FAIL; 467 return -1; 468 } 469 470 os_memset(&iret, 0, sizeof(iret)); 471 wpabuf_set(&msg, hdr, len); 472 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 473 &msg); 474 if (*resp == NULL || 475 (iret.methodState == METHOD_DONE && 476 iret.decision == DECISION_FAIL)) { 477 ret->methodState = METHOD_DONE; 478 ret->decision = DECISION_FAIL; 479 } else if ((iret.methodState == METHOD_DONE || 480 iret.methodState == METHOD_MAY_CONT) && 481 (iret.decision == DECISION_UNCOND_SUCC || 482 iret.decision == DECISION_COND_SUCC)) { 483 data->phase2_success = 1; 484 } 485 486 if (*resp == NULL && config && 487 (config->pending_req_identity || config->pending_req_password || 488 config->pending_req_otp || config->pending_req_new_password)) { 489 wpabuf_free(data->pending_phase2_req); 490 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 491 } else if (*resp == NULL) 492 return -1; 493 494 return 0; 495 } 496 497 498 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 499 { 500 struct wpabuf *buf; 501 struct eap_tlv_nak_tlv *nak; 502 buf = wpabuf_alloc(sizeof(*nak)); 503 if (buf == NULL) 504 return NULL; 505 nak = wpabuf_put(buf, sizeof(*nak)); 506 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 507 nak->length = host_to_be16(6); 508 nak->vendor_id = host_to_be32(vendor_id); 509 nak->nak_type = host_to_be16(tlv_type); 510 return buf; 511 } 512 513 514 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 515 { 516 struct wpabuf *buf; 517 struct eap_tlv_intermediate_result_tlv *result; 518 buf = wpabuf_alloc(sizeof(*result)); 519 if (buf == NULL) 520 return NULL; 521 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 522 intermediate ? "Intermediate " : "", status); 523 result = wpabuf_put(buf, sizeof(*result)); 524 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 525 (intermediate ? 526 EAP_TLV_INTERMEDIATE_RESULT_TLV : 527 EAP_TLV_RESULT_TLV)); 528 result->length = host_to_be16(2); 529 result->status = host_to_be16(status); 530 return buf; 531 } 532 533 534 static struct wpabuf * eap_fast_tlv_pac_ack(void) 535 { 536 struct wpabuf *buf; 537 struct eap_tlv_result_tlv *res; 538 struct eap_tlv_pac_ack_tlv *ack; 539 540 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 541 if (buf == NULL) 542 return NULL; 543 544 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 545 ack = wpabuf_put(buf, sizeof(*ack)); 546 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 547 EAP_TLV_TYPE_MANDATORY); 548 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 549 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 550 ack->pac_len = host_to_be16(2); 551 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 552 553 return buf; 554 } 555 556 557 static struct wpabuf * eap_fast_process_eap_payload_tlv( 558 struct eap_sm *sm, struct eap_fast_data *data, 559 struct eap_method_ret *ret, 560 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 561 { 562 struct eap_hdr *hdr; 563 struct wpabuf *resp = NULL; 564 565 if (eap_payload_tlv_len < sizeof(*hdr)) { 566 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 567 "Payload TLV (len=%lu)", 568 (unsigned long) eap_payload_tlv_len); 569 return NULL; 570 } 571 572 hdr = (struct eap_hdr *) eap_payload_tlv; 573 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 574 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 575 "EAP Payload TLV"); 576 return NULL; 577 } 578 579 if (hdr->code != EAP_CODE_REQUEST) { 580 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 581 "Phase 2 EAP header", hdr->code); 582 return NULL; 583 } 584 585 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 586 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 587 "failed"); 588 return NULL; 589 } 590 591 return eap_fast_tlv_eap_payload(resp); 592 } 593 594 595 static int eap_fast_validate_crypto_binding( 596 struct eap_tlv_crypto_binding_tlv *_bind) 597 { 598 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 599 "Received Version %d SubType %d", 600 _bind->version, _bind->received_version, _bind->subtype); 601 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 602 _bind->nonce, sizeof(_bind->nonce)); 603 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 604 _bind->compound_mac, sizeof(_bind->compound_mac)); 605 606 if (_bind->version != EAP_FAST_VERSION || 607 _bind->received_version != EAP_FAST_VERSION || 608 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 609 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 610 "Crypto-Binding TLV: Version %d " 611 "Received Version %d SubType %d", 612 _bind->version, _bind->received_version, 613 _bind->subtype); 614 return -1; 615 } 616 617 return 0; 618 } 619 620 621 static void eap_fast_write_crypto_binding( 622 struct eap_tlv_crypto_binding_tlv *rbind, 623 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 624 { 625 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 626 EAP_TLV_CRYPTO_BINDING_TLV); 627 rbind->length = host_to_be16(sizeof(*rbind) - 628 sizeof(struct eap_tlv_hdr)); 629 rbind->version = EAP_FAST_VERSION; 630 rbind->received_version = _bind->version; 631 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 632 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 633 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 634 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 635 rbind->compound_mac); 636 637 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 638 "Received Version %d SubType %d", 639 rbind->version, rbind->received_version, rbind->subtype); 640 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 641 rbind->nonce, sizeof(rbind->nonce)); 642 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 643 rbind->compound_mac, sizeof(rbind->compound_mac)); 644 } 645 646 647 static int eap_fast_get_phase2_key(struct eap_sm *sm, 648 struct eap_fast_data *data, 649 u8 *isk, size_t isk_len) 650 { 651 u8 *key; 652 size_t key_len; 653 654 os_memset(isk, 0, isk_len); 655 656 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 657 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 658 "available"); 659 return -1; 660 } 661 662 if (data->phase2_method->isKeyAvailable == NULL || 663 data->phase2_method->getKey == NULL) 664 return 0; 665 666 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 667 (key = data->phase2_method->getKey(sm, data->phase2_priv, 668 &key_len)) == NULL) { 669 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 670 "from Phase 2"); 671 return -1; 672 } 673 674 if (key_len > isk_len) 675 key_len = isk_len; 676 if (key_len == 32 && 677 data->phase2_method->vendor == EAP_VENDOR_IETF && 678 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 679 /* 680 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 681 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 682 * ISK for EAP-FAST cryptobinding. 683 */ 684 os_memcpy(isk, key + 16, 16); 685 os_memcpy(isk + 16, key, 16); 686 } else 687 os_memcpy(isk, key, key_len); 688 os_free(key); 689 690 return 0; 691 } 692 693 694 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 695 u8 *cmk) 696 { 697 u8 isk[32], imck[60]; 698 699 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 700 "calculation", data->simck_idx + 1); 701 702 /* 703 * RFC 4851, Section 5.2: 704 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 705 * MSK[j], 60) 706 * S-IMCK[j] = first 40 octets of IMCK[j] 707 * CMK[j] = last 20 octets of IMCK[j] 708 */ 709 710 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 711 return -1; 712 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 713 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 714 "Inner Methods Compound Keys", 715 isk, sizeof(isk), imck, sizeof(imck)); 716 data->simck_idx++; 717 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 718 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 719 data->simck, EAP_FAST_SIMCK_LEN); 720 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 721 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 722 cmk, EAP_FAST_CMK_LEN); 723 724 return 0; 725 } 726 727 728 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 729 { 730 struct eap_tlv_hdr *pac; 731 struct eap_tlv_request_action_tlv *act; 732 struct eap_tlv_pac_type_tlv *type; 733 734 act = (struct eap_tlv_request_action_tlv *) pos; 735 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 736 act->length = host_to_be16(2); 737 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 738 739 pac = (struct eap_tlv_hdr *) (act + 1); 740 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 741 pac->length = host_to_be16(sizeof(*type)); 742 743 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 744 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 745 type->length = host_to_be16(2); 746 type->pac_type = host_to_be16(pac_type); 747 748 return (u8 *) (type + 1); 749 } 750 751 752 static struct wpabuf * eap_fast_process_crypto_binding( 753 struct eap_sm *sm, struct eap_fast_data *data, 754 struct eap_method_ret *ret, 755 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 756 { 757 struct wpabuf *resp; 758 u8 *pos; 759 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 760 int res; 761 size_t len; 762 763 if (eap_fast_validate_crypto_binding(_bind) < 0) 764 return NULL; 765 766 if (eap_fast_get_cmk(sm, data, cmk) < 0) 767 return NULL; 768 769 /* Validate received Compound MAC */ 770 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 771 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 772 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 773 "MAC calculation", (u8 *) _bind, bind_len); 774 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 775 _bind->compound_mac); 776 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 777 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 778 cmac, sizeof(cmac)); 779 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 780 _bind->compound_mac, sizeof(cmac)); 781 if (res != 0) { 782 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 783 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 784 return NULL; 785 } 786 787 /* 788 * Compound MAC was valid, so authentication succeeded. Reply with 789 * crypto binding to allow server to complete authentication. 790 */ 791 792 len = sizeof(struct eap_tlv_crypto_binding_tlv); 793 resp = wpabuf_alloc(len); 794 if (resp == NULL) 795 return NULL; 796 797 if (!data->anon_provisioning && data->phase2_success && 798 eap_fast_derive_msk(data) < 0) { 799 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 800 ret->methodState = METHOD_DONE; 801 ret->decision = DECISION_FAIL; 802 data->phase2_success = 0; 803 wpabuf_free(resp); 804 return NULL; 805 } 806 807 if (!data->anon_provisioning && data->phase2_success) { 808 os_free(data->session_id); 809 data->session_id = eap_peer_tls_derive_session_id( 810 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 811 if (data->session_id) { 812 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 813 data->session_id, data->id_len); 814 } else { 815 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 816 "Session-Id"); 817 wpabuf_free(resp); 818 return NULL; 819 } 820 } 821 822 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 823 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 824 pos, _bind, cmk); 825 826 return resp; 827 } 828 829 830 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 831 u8 *pos, size_t len, int *pac_key_found) 832 { 833 switch (type & 0x7fff) { 834 case PAC_TYPE_PAC_KEY: 835 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 836 if (len != EAP_FAST_PAC_KEY_LEN) { 837 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 838 "length %lu", (unsigned long) len); 839 break; 840 } 841 *pac_key_found = 1; 842 os_memcpy(entry->pac_key, pos, len); 843 break; 844 case PAC_TYPE_PAC_OPAQUE: 845 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 846 entry->pac_opaque = pos; 847 entry->pac_opaque_len = len; 848 break; 849 case PAC_TYPE_PAC_INFO: 850 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 851 entry->pac_info = pos; 852 entry->pac_info_len = len; 853 break; 854 default: 855 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 856 type); 857 break; 858 } 859 } 860 861 862 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 863 u8 *pac, size_t pac_len) 864 { 865 struct pac_tlv_hdr *hdr; 866 u8 *pos; 867 size_t left, len; 868 int type, pac_key_found = 0; 869 870 pos = pac; 871 left = pac_len; 872 873 while (left > sizeof(*hdr)) { 874 hdr = (struct pac_tlv_hdr *) pos; 875 type = be_to_host16(hdr->type); 876 len = be_to_host16(hdr->len); 877 pos += sizeof(*hdr); 878 left -= sizeof(*hdr); 879 if (len > left) { 880 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 881 "(type=%d len=%lu left=%lu)", 882 type, (unsigned long) len, 883 (unsigned long) left); 884 return -1; 885 } 886 887 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 888 889 pos += len; 890 left -= len; 891 } 892 893 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 894 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 895 "all the required fields"); 896 return -1; 897 } 898 899 return 0; 900 } 901 902 903 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 904 u8 *pos, size_t len) 905 { 906 u16 pac_type; 907 u32 lifetime; 908 struct os_time now; 909 910 switch (type & 0x7fff) { 911 case PAC_TYPE_CRED_LIFETIME: 912 if (len != 4) { 913 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 914 "Invalid CRED_LIFETIME length - ignored", 915 pos, len); 916 return 0; 917 } 918 919 /* 920 * This is not currently saved separately in PAC files since 921 * the server can automatically initiate PAC update when 922 * needed. Anyway, the information is available from PAC-Info 923 * dump if it is needed for something in the future. 924 */ 925 lifetime = WPA_GET_BE32(pos); 926 os_get_time(&now); 927 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 928 "(%d days)", 929 lifetime, (lifetime - (u32) now.sec) / 86400); 930 break; 931 case PAC_TYPE_A_ID: 932 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 933 pos, len); 934 entry->a_id = pos; 935 entry->a_id_len = len; 936 break; 937 case PAC_TYPE_I_ID: 938 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 939 pos, len); 940 entry->i_id = pos; 941 entry->i_id_len = len; 942 break; 943 case PAC_TYPE_A_ID_INFO: 944 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 945 pos, len); 946 entry->a_id_info = pos; 947 entry->a_id_info_len = len; 948 break; 949 case PAC_TYPE_PAC_TYPE: 950 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 951 if (len != 2) { 952 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 953 "length %lu (expected 2)", 954 (unsigned long) len); 955 wpa_hexdump_ascii(MSG_DEBUG, 956 "EAP-FAST: PAC-Info - PAC-Type", 957 pos, len); 958 return -1; 959 } 960 pac_type = WPA_GET_BE16(pos); 961 if (pac_type != PAC_TYPE_TUNNEL_PAC && 962 pac_type != PAC_TYPE_USER_AUTHORIZATION && 963 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 964 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 965 "%d", pac_type); 966 return -1; 967 } 968 969 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 970 pac_type); 971 entry->pac_type = pac_type; 972 break; 973 default: 974 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 975 "type %d", type); 976 break; 977 } 978 979 return 0; 980 } 981 982 983 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 984 { 985 struct pac_tlv_hdr *hdr; 986 u8 *pos; 987 size_t left, len; 988 int type; 989 990 /* RFC 5422, Section 4.2.4 */ 991 992 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 993 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 994 995 pos = entry->pac_info; 996 left = entry->pac_info_len; 997 while (left > sizeof(*hdr)) { 998 hdr = (struct pac_tlv_hdr *) pos; 999 type = be_to_host16(hdr->type); 1000 len = be_to_host16(hdr->len); 1001 pos += sizeof(*hdr); 1002 left -= sizeof(*hdr); 1003 if (len > left) { 1004 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1005 "(type=%d len=%lu left=%lu)", 1006 type, (unsigned long) len, 1007 (unsigned long) left); 1008 return -1; 1009 } 1010 1011 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1012 return -1; 1013 1014 pos += len; 1015 left -= len; 1016 } 1017 1018 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1019 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1020 "all the required fields"); 1021 return -1; 1022 } 1023 1024 return 0; 1025 } 1026 1027 1028 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1029 struct eap_fast_data *data, 1030 struct eap_method_ret *ret, 1031 u8 *pac, size_t pac_len) 1032 { 1033 struct eap_peer_config *config = eap_get_config(sm); 1034 struct eap_fast_pac entry; 1035 1036 os_memset(&entry, 0, sizeof(entry)); 1037 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1038 eap_fast_process_pac_info(&entry)) 1039 return NULL; 1040 1041 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1042 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1043 if (data->use_pac_binary_format) 1044 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1045 else 1046 eap_fast_save_pac(sm, data->pac, config->pac_file); 1047 1048 if (data->provisioning) { 1049 if (data->anon_provisioning) { 1050 /* 1051 * Unauthenticated provisioning does not provide keying 1052 * material and must end with an EAP-Failure. 1053 * Authentication will be done separately after this. 1054 */ 1055 data->success = 0; 1056 ret->decision = DECISION_FAIL; 1057 } else { 1058 /* 1059 * Server may or may not allow authenticated 1060 * provisioning also for key generation. 1061 */ 1062 ret->decision = DECISION_COND_SUCC; 1063 } 1064 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1065 "- Provisioning completed successfully"); 1066 sm->expected_failure = 1; 1067 } else { 1068 /* 1069 * This is PAC refreshing, i.e., normal authentication that is 1070 * expected to be completed with an EAP-Success. However, 1071 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1072 * after protected success exchange in case of EAP-Fast 1073 * provisioning, so we better use DECISION_COND_SUCC here 1074 * instead of DECISION_UNCOND_SUCC. 1075 */ 1076 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1077 "- PAC refreshing completed successfully"); 1078 ret->decision = DECISION_COND_SUCC; 1079 } 1080 ret->methodState = METHOD_DONE; 1081 return eap_fast_tlv_pac_ack(); 1082 } 1083 1084 1085 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1086 struct eap_fast_tlv_parse *tlv, 1087 struct wpabuf **resp) 1088 { 1089 int mandatory, tlv_type, res; 1090 size_t len; 1091 u8 *pos, *end; 1092 1093 os_memset(tlv, 0, sizeof(*tlv)); 1094 1095 /* Parse TLVs from the decrypted Phase 2 data */ 1096 pos = wpabuf_mhead(decrypted); 1097 end = pos + wpabuf_len(decrypted); 1098 while (end - pos > 4) { 1099 mandatory = pos[0] & 0x80; 1100 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1101 pos += 2; 1102 len = WPA_GET_BE16(pos); 1103 pos += 2; 1104 if (len > (size_t) (end - pos)) { 1105 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1106 return -1; 1107 } 1108 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1109 "TLV type %d length %u%s", 1110 tlv_type, (unsigned int) len, 1111 mandatory ? " (mandatory)" : ""); 1112 1113 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1114 if (res == -2) 1115 break; 1116 if (res < 0) { 1117 if (mandatory) { 1118 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1119 "mandatory TLV type %d", tlv_type); 1120 *resp = eap_fast_tlv_nak(0, tlv_type); 1121 break; 1122 } else { 1123 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1124 "unknown optional TLV type %d", 1125 tlv_type); 1126 } 1127 } 1128 1129 pos += len; 1130 } 1131 1132 return 0; 1133 } 1134 1135 1136 static int eap_fast_encrypt_response(struct eap_sm *sm, 1137 struct eap_fast_data *data, 1138 struct wpabuf *resp, 1139 u8 identifier, struct wpabuf **out_data) 1140 { 1141 if (resp == NULL) 1142 return 0; 1143 1144 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1145 resp); 1146 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1147 data->fast_version, identifier, 1148 resp, out_data)) { 1149 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1150 "frame"); 1151 } 1152 wpabuf_free(resp); 1153 1154 return 0; 1155 } 1156 1157 1158 static struct wpabuf * eap_fast_pac_request(void) 1159 { 1160 struct wpabuf *tmp; 1161 u8 *pos, *pos2; 1162 1163 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1164 sizeof(struct eap_tlv_request_action_tlv) + 1165 sizeof(struct eap_tlv_pac_type_tlv)); 1166 if (tmp == NULL) 1167 return NULL; 1168 1169 pos = wpabuf_put(tmp, 0); 1170 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1171 wpabuf_put(tmp, pos2 - pos); 1172 return tmp; 1173 } 1174 1175 1176 static int eap_fast_process_decrypted(struct eap_sm *sm, 1177 struct eap_fast_data *data, 1178 struct eap_method_ret *ret, 1179 u8 identifier, 1180 struct wpabuf *decrypted, 1181 struct wpabuf **out_data) 1182 { 1183 struct wpabuf *resp = NULL, *tmp; 1184 struct eap_fast_tlv_parse tlv; 1185 int failed = 0; 1186 1187 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1188 return 0; 1189 if (resp) 1190 return eap_fast_encrypt_response(sm, data, resp, 1191 identifier, out_data); 1192 1193 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1194 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1195 return eap_fast_encrypt_response(sm, data, resp, 1196 identifier, out_data); 1197 } 1198 1199 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1200 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1201 return eap_fast_encrypt_response(sm, data, resp, 1202 identifier, out_data); 1203 } 1204 1205 if (tlv.crypto_binding) { 1206 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1207 tlv.crypto_binding, 1208 tlv.crypto_binding_len); 1209 if (tmp == NULL) 1210 failed = 1; 1211 else 1212 resp = wpabuf_concat(resp, tmp); 1213 } 1214 1215 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1216 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1217 EAP_TLV_RESULT_SUCCESS, 1); 1218 resp = wpabuf_concat(resp, tmp); 1219 } 1220 1221 if (tlv.eap_payload_tlv) { 1222 tmp = eap_fast_process_eap_payload_tlv( 1223 sm, data, ret, tlv.eap_payload_tlv, 1224 tlv.eap_payload_tlv_len); 1225 resp = wpabuf_concat(resp, tmp); 1226 } 1227 1228 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1229 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1230 "acknowledging success"); 1231 failed = 1; 1232 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1233 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1234 tlv.pac_len); 1235 resp = wpabuf_concat(resp, tmp); 1236 } 1237 1238 if (data->current_pac == NULL && data->provisioning && 1239 !data->anon_provisioning && !tlv.pac && 1240 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1241 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1242 /* 1243 * Need to request Tunnel PAC when using authenticated 1244 * provisioning. 1245 */ 1246 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1247 tmp = eap_fast_pac_request(); 1248 resp = wpabuf_concat(resp, tmp); 1249 } 1250 1251 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1252 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1253 resp = wpabuf_concat(tmp, resp); 1254 } else if (failed) { 1255 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1256 resp = wpabuf_concat(tmp, resp); 1257 } 1258 1259 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1260 tlv.crypto_binding && data->phase2_success) { 1261 if (data->anon_provisioning) { 1262 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1263 "provisioning completed successfully."); 1264 ret->methodState = METHOD_DONE; 1265 ret->decision = DECISION_FAIL; 1266 sm->expected_failure = 1; 1267 } else { 1268 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1269 "completed successfully."); 1270 if (data->provisioning) 1271 ret->methodState = METHOD_MAY_CONT; 1272 else 1273 ret->methodState = METHOD_DONE; 1274 ret->decision = DECISION_UNCOND_SUCC; 1275 } 1276 } 1277 1278 if (resp == NULL) { 1279 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1280 "empty response packet"); 1281 resp = wpabuf_alloc(1); 1282 } 1283 1284 return eap_fast_encrypt_response(sm, data, resp, identifier, 1285 out_data); 1286 } 1287 1288 1289 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1290 struct eap_method_ret *ret, u8 identifier, 1291 const struct wpabuf *in_data, 1292 struct wpabuf **out_data) 1293 { 1294 struct wpabuf *in_decrypted; 1295 int res; 1296 1297 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1298 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1299 1300 if (data->pending_phase2_req) { 1301 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1302 "skip decryption and use old data"); 1303 /* Clear TLS reassembly state. */ 1304 eap_peer_tls_reset_input(&data->ssl); 1305 1306 in_decrypted = data->pending_phase2_req; 1307 data->pending_phase2_req = NULL; 1308 goto continue_req; 1309 } 1310 1311 if (wpabuf_len(in_data) == 0) { 1312 /* Received TLS ACK - requesting more fragments */ 1313 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1314 data->fast_version, 1315 identifier, NULL, out_data); 1316 } 1317 1318 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1319 if (res) 1320 return res; 1321 1322 continue_req: 1323 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1324 in_decrypted); 1325 1326 if (wpabuf_len(in_decrypted) < 4) { 1327 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1328 "TLV frame (len=%lu)", 1329 (unsigned long) wpabuf_len(in_decrypted)); 1330 wpabuf_free(in_decrypted); 1331 return -1; 1332 } 1333 1334 res = eap_fast_process_decrypted(sm, data, ret, identifier, 1335 in_decrypted, out_data); 1336 1337 wpabuf_free(in_decrypted); 1338 1339 return res; 1340 } 1341 1342 1343 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1344 { 1345 const u8 *a_id; 1346 const struct pac_tlv_hdr *hdr; 1347 1348 /* 1349 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1350 * supports both raw A-ID and one inside an A-ID TLV. 1351 */ 1352 a_id = buf; 1353 *id_len = len; 1354 if (len > sizeof(*hdr)) { 1355 int tlen; 1356 hdr = (const struct pac_tlv_hdr *) buf; 1357 tlen = be_to_host16(hdr->len); 1358 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1359 sizeof(*hdr) + tlen <= len) { 1360 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1361 "(Start)"); 1362 a_id = (const u8 *) (hdr + 1); 1363 *id_len = tlen; 1364 } 1365 } 1366 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1367 1368 return a_id; 1369 } 1370 1371 1372 static void eap_fast_select_pac(struct eap_fast_data *data, 1373 const u8 *a_id, size_t a_id_len) 1374 { 1375 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1376 PAC_TYPE_TUNNEL_PAC); 1377 if (data->current_pac == NULL) { 1378 /* 1379 * Tunnel PAC was not available for this A-ID. Try to use 1380 * Machine Authentication PAC, if one is available. 1381 */ 1382 data->current_pac = eap_fast_get_pac( 1383 data->pac, a_id, a_id_len, 1384 PAC_TYPE_MACHINE_AUTHENTICATION); 1385 } 1386 1387 if (data->current_pac) { 1388 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1389 "(PAC-Type %d)", data->current_pac->pac_type); 1390 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1391 data->current_pac->a_id_info, 1392 data->current_pac->a_id_info_len); 1393 } 1394 } 1395 1396 1397 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1398 struct eap_fast_data *data, 1399 struct eap_fast_pac *pac) 1400 { 1401 u8 *tlv; 1402 size_t tlv_len, olen; 1403 struct eap_tlv_hdr *ehdr; 1404 1405 olen = pac->pac_opaque_len; 1406 tlv_len = sizeof(*ehdr) + olen; 1407 tlv = os_malloc(tlv_len); 1408 if (tlv) { 1409 ehdr = (struct eap_tlv_hdr *) tlv; 1410 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1411 ehdr->length = host_to_be16(olen); 1412 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1413 } 1414 if (tlv == NULL || 1415 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1416 TLS_EXT_PAC_OPAQUE, 1417 tlv, tlv_len) < 0) { 1418 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1419 "extension"); 1420 os_free(tlv); 1421 return -1; 1422 } 1423 os_free(tlv); 1424 1425 return 0; 1426 } 1427 1428 1429 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1430 struct eap_fast_data *data) 1431 { 1432 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1433 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1434 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1435 "TLS extension"); 1436 return -1; 1437 } 1438 return 0; 1439 } 1440 1441 1442 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1443 struct eap_fast_data *data) 1444 { 1445 u8 ciphers[7]; 1446 int count = 0; 1447 1448 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1449 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1450 "provisioning TLS cipher suites"); 1451 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1452 } 1453 1454 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1455 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1456 "provisioning TLS cipher suites"); 1457 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA; 1458 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1459 ciphers[count++] = TLS_CIPHER_AES256_SHA; 1460 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1461 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1462 } 1463 1464 ciphers[count++] = TLS_CIPHER_NONE; 1465 1466 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1467 ciphers)) { 1468 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1469 "cipher suites for provisioning"); 1470 return -1; 1471 } 1472 1473 return 0; 1474 } 1475 1476 1477 static int eap_fast_process_start(struct eap_sm *sm, 1478 struct eap_fast_data *data, u8 flags, 1479 const u8 *pos, size_t left) 1480 { 1481 const u8 *a_id; 1482 size_t a_id_len; 1483 1484 /* EAP-FAST Version negotiation (section 3.1) */ 1485 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1486 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1487 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1488 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1489 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1490 data->fast_version); 1491 1492 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1493 eap_fast_select_pac(data, a_id, a_id_len); 1494 1495 if (data->resuming && data->current_pac) { 1496 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1497 "do not add PAC-Opaque to TLS ClientHello"); 1498 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1499 return -1; 1500 } else if (data->current_pac) { 1501 /* 1502 * PAC found for the A-ID and we are not resuming an old 1503 * session, so add PAC-Opaque extension to ClientHello. 1504 */ 1505 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1506 return -1; 1507 } else { 1508 /* No PAC found, so we must provision one. */ 1509 if (!data->provisioning_allowed) { 1510 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1511 "provisioning disabled"); 1512 return -1; 1513 } 1514 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1515 "starting provisioning"); 1516 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1517 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1518 return -1; 1519 data->provisioning = 1; 1520 } 1521 1522 return 0; 1523 } 1524 1525 1526 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1527 struct eap_method_ret *ret, 1528 const struct wpabuf *reqData) 1529 { 1530 const struct eap_hdr *req; 1531 size_t left; 1532 int res; 1533 u8 flags, id; 1534 struct wpabuf *resp; 1535 const u8 *pos; 1536 struct eap_fast_data *data = priv; 1537 struct wpabuf msg; 1538 1539 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1540 reqData, &left, &flags); 1541 if (pos == NULL) 1542 return NULL; 1543 1544 req = wpabuf_head(reqData); 1545 id = req->identifier; 1546 1547 if (flags & EAP_TLS_FLAGS_START) { 1548 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1549 return NULL; 1550 1551 left = 0; /* A-ID is not used in further packet processing */ 1552 } 1553 1554 wpabuf_set(&msg, pos, left); 1555 1556 resp = NULL; 1557 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1558 !data->resuming) { 1559 /* Process tunneled (encrypted) phase 2 data. */ 1560 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1561 if (res < 0) { 1562 ret->methodState = METHOD_DONE; 1563 ret->decision = DECISION_FAIL; 1564 /* 1565 * Ack possible Alert that may have caused failure in 1566 * decryption. 1567 */ 1568 res = 1; 1569 } 1570 } else { 1571 if (sm->waiting_ext_cert_check && data->pending_resp) { 1572 struct eap_peer_config *config = eap_get_config(sm); 1573 1574 if (config->pending_ext_cert_check == 1575 EXT_CERT_CHECK_GOOD) { 1576 wpa_printf(MSG_DEBUG, 1577 "EAP-FAST: External certificate check succeeded - continue handshake"); 1578 resp = data->pending_resp; 1579 data->pending_resp = NULL; 1580 sm->waiting_ext_cert_check = 0; 1581 return resp; 1582 } 1583 1584 if (config->pending_ext_cert_check == 1585 EXT_CERT_CHECK_BAD) { 1586 wpa_printf(MSG_DEBUG, 1587 "EAP-FAST: External certificate check failed - force authentication failure"); 1588 ret->methodState = METHOD_DONE; 1589 ret->decision = DECISION_FAIL; 1590 sm->waiting_ext_cert_check = 0; 1591 return NULL; 1592 } 1593 1594 wpa_printf(MSG_DEBUG, 1595 "EAP-FAST: Continuing to wait external server certificate validation"); 1596 return NULL; 1597 } 1598 1599 /* Continue processing TLS handshake (phase 1). */ 1600 res = eap_peer_tls_process_helper(sm, &data->ssl, 1601 EAP_TYPE_FAST, 1602 data->fast_version, id, &msg, 1603 &resp); 1604 if (res < 0) { 1605 wpa_printf(MSG_DEBUG, 1606 "EAP-FAST: TLS processing failed"); 1607 ret->methodState = METHOD_DONE; 1608 ret->decision = DECISION_FAIL; 1609 return resp; 1610 } 1611 1612 if (sm->waiting_ext_cert_check) { 1613 wpa_printf(MSG_DEBUG, 1614 "EAP-FAST: Waiting external server certificate validation"); 1615 wpabuf_free(data->pending_resp); 1616 data->pending_resp = resp; 1617 return NULL; 1618 } 1619 1620 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1621 char cipher[80]; 1622 wpa_printf(MSG_DEBUG, 1623 "EAP-FAST: TLS done, proceed to Phase 2"); 1624 if (data->provisioning && 1625 (!(data->provisioning_allowed & 1626 EAP_FAST_PROV_AUTH) || 1627 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1628 cipher, sizeof(cipher)) < 0 || 1629 os_strstr(cipher, "ADH-") || 1630 os_strstr(cipher, "anon"))) { 1631 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1632 "anonymous (unauthenticated) " 1633 "provisioning"); 1634 data->anon_provisioning = 1; 1635 } else 1636 data->anon_provisioning = 0; 1637 data->resuming = 0; 1638 if (eap_fast_derive_keys(sm, data) < 0) { 1639 wpa_printf(MSG_DEBUG, 1640 "EAP-FAST: Could not derive keys"); 1641 ret->methodState = METHOD_DONE; 1642 ret->decision = DECISION_FAIL; 1643 wpabuf_free(resp); 1644 return NULL; 1645 } 1646 } 1647 1648 if (res == 2) { 1649 /* 1650 * Application data included in the handshake message. 1651 */ 1652 wpabuf_free(data->pending_phase2_req); 1653 data->pending_phase2_req = resp; 1654 resp = NULL; 1655 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1656 } 1657 } 1658 1659 if (res == 1) { 1660 wpabuf_free(resp); 1661 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1662 data->fast_version); 1663 } 1664 1665 return resp; 1666 } 1667 1668 1669 #if 0 /* FIX */ 1670 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1671 { 1672 struct eap_fast_data *data = priv; 1673 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1674 } 1675 1676 1677 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1678 { 1679 struct eap_fast_data *data = priv; 1680 os_free(data->key_block_p); 1681 data->key_block_p = NULL; 1682 wpabuf_free(data->pending_phase2_req); 1683 data->pending_phase2_req = NULL; 1684 wpabuf_free(data->pending_resp); 1685 data->pending_resp = NULL; 1686 } 1687 1688 1689 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1690 { 1691 struct eap_fast_data *data = priv; 1692 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1693 os_free(data); 1694 return NULL; 1695 } 1696 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1697 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1698 os_free(data->session_id); 1699 data->session_id = NULL; 1700 if (data->phase2_priv && data->phase2_method && 1701 data->phase2_method->init_for_reauth) 1702 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1703 data->phase2_success = 0; 1704 data->resuming = 1; 1705 data->provisioning = 0; 1706 data->anon_provisioning = 0; 1707 data->simck_idx = 0; 1708 return priv; 1709 } 1710 #endif 1711 1712 1713 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1714 size_t buflen, int verbose) 1715 { 1716 struct eap_fast_data *data = priv; 1717 int len, ret; 1718 1719 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1720 if (data->phase2_method) { 1721 ret = os_snprintf(buf + len, buflen - len, 1722 "EAP-FAST Phase2 method=%s\n", 1723 data->phase2_method->name); 1724 if (os_snprintf_error(buflen - len, ret)) 1725 return len; 1726 len += ret; 1727 } 1728 return len; 1729 } 1730 1731 1732 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1733 { 1734 struct eap_fast_data *data = priv; 1735 return data->success; 1736 } 1737 1738 1739 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1740 { 1741 struct eap_fast_data *data = priv; 1742 u8 *key; 1743 1744 if (!data->success) 1745 return NULL; 1746 1747 key = os_malloc(EAP_FAST_KEY_LEN); 1748 if (key == NULL) 1749 return NULL; 1750 1751 *len = EAP_FAST_KEY_LEN; 1752 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN); 1753 1754 return key; 1755 } 1756 1757 1758 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1759 { 1760 struct eap_fast_data *data = priv; 1761 u8 *id; 1762 1763 if (!data->success || !data->session_id) 1764 return NULL; 1765 1766 id = os_malloc(data->id_len); 1767 if (id == NULL) 1768 return NULL; 1769 1770 *len = data->id_len; 1771 os_memcpy(id, data->session_id, data->id_len); 1772 1773 return id; 1774 } 1775 1776 1777 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1778 { 1779 struct eap_fast_data *data = priv; 1780 u8 *key; 1781 1782 if (!data->success) 1783 return NULL; 1784 1785 key = os_malloc(EAP_EMSK_LEN); 1786 if (key == NULL) 1787 return NULL; 1788 1789 *len = EAP_EMSK_LEN; 1790 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1791 1792 return key; 1793 } 1794 1795 1796 int eap_peer_fast_register(void) 1797 { 1798 struct eap_method *eap; 1799 1800 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1801 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1802 if (eap == NULL) 1803 return -1; 1804 1805 eap->init = eap_fast_init; 1806 eap->deinit = eap_fast_deinit; 1807 eap->process = eap_fast_process; 1808 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1809 eap->getKey = eap_fast_getKey; 1810 eap->getSessionId = eap_fast_get_session_id; 1811 eap->get_status = eap_fast_get_status; 1812 #if 0 1813 eap->has_reauth_data = eap_fast_has_reauth_data; 1814 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1815 eap->init_for_reauth = eap_fast_init_for_reauth; 1816 #endif 1817 eap->get_emsk = eap_fast_get_emsk; 1818 1819 return eap_peer_method_register(eap); 1820 } 1821
