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, 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, u8 type) 368 { 369 size_t i; 370 371 /* TODO: TNC with anonymous provisioning; need to require both 372 * completed MSCHAPv2 and TNC */ 373 374 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) { 375 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 376 "during unauthenticated provisioning; reject phase2" 377 " type %d", type); 378 return -1; 379 } 380 381 #ifdef EAP_TNC 382 if (type == EAP_TYPE_TNC) { 383 data->phase2_type.vendor = EAP_VENDOR_IETF; 384 data->phase2_type.method = EAP_TYPE_TNC; 385 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 386 "vendor %d method %d for TNC", 387 data->phase2_type.vendor, 388 data->phase2_type.method); 389 return 0; 390 } 391 #endif /* EAP_TNC */ 392 393 for (i = 0; i < data->num_phase2_types; i++) { 394 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 395 data->phase2_types[i].method != type) 396 continue; 397 398 data->phase2_type.vendor = data->phase2_types[i].vendor; 399 data->phase2_type.method = data->phase2_types[i].method; 400 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 401 "vendor %d method %d", 402 data->phase2_type.vendor, 403 data->phase2_type.method); 404 break; 405 } 406 407 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 408 return -1; 409 410 return 0; 411 } 412 413 414 static int eap_fast_phase2_request(struct eap_sm *sm, 415 struct eap_fast_data *data, 416 struct eap_method_ret *ret, 417 struct eap_hdr *hdr, 418 struct wpabuf **resp) 419 { 420 size_t len = be_to_host16(hdr->length); 421 u8 *pos; 422 struct eap_method_ret iret; 423 struct eap_peer_config *config = eap_get_config(sm); 424 struct wpabuf msg; 425 426 if (len <= sizeof(struct eap_hdr)) { 427 wpa_printf(MSG_INFO, "EAP-FAST: too short " 428 "Phase 2 request (len=%lu)", (unsigned long) len); 429 return -1; 430 } 431 pos = (u8 *) (hdr + 1); 432 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 433 if (*pos == EAP_TYPE_IDENTITY) { 434 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 435 return 0; 436 } 437 438 if (data->phase2_priv && data->phase2_method && 439 *pos != data->phase2_type.method) { 440 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 441 "deinitialize previous method"); 442 data->phase2_method->deinit(sm, data->phase2_priv); 443 data->phase2_method = NULL; 444 data->phase2_priv = NULL; 445 data->phase2_type.vendor = EAP_VENDOR_IETF; 446 data->phase2_type.method = EAP_TYPE_NONE; 447 } 448 449 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 450 data->phase2_type.method == EAP_TYPE_NONE && 451 eap_fast_select_phase2_method(data, *pos) < 0) { 452 if (eap_peer_tls_phase2_nak(data->phase2_types, 453 data->num_phase2_types, 454 hdr, resp)) 455 return -1; 456 return 0; 457 } 458 459 if ((data->phase2_priv == NULL && 460 eap_fast_init_phase2_method(sm, data) < 0) || 461 data->phase2_method == NULL) { 462 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 463 "Phase 2 EAP method %d", *pos); 464 ret->methodState = METHOD_DONE; 465 ret->decision = DECISION_FAIL; 466 return -1; 467 } 468 469 os_memset(&iret, 0, sizeof(iret)); 470 wpabuf_set(&msg, hdr, len); 471 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 472 &msg); 473 if (*resp == NULL || 474 (iret.methodState == METHOD_DONE && 475 iret.decision == DECISION_FAIL)) { 476 ret->methodState = METHOD_DONE; 477 ret->decision = DECISION_FAIL; 478 } else if ((iret.methodState == METHOD_DONE || 479 iret.methodState == METHOD_MAY_CONT) && 480 (iret.decision == DECISION_UNCOND_SUCC || 481 iret.decision == DECISION_COND_SUCC)) { 482 data->phase2_success = 1; 483 } 484 485 if (*resp == NULL && config && 486 (config->pending_req_identity || config->pending_req_password || 487 config->pending_req_otp || config->pending_req_new_password || 488 config->pending_req_sim)) { 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 if (sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 714 "Inner Methods Compound Keys", 715 isk, sizeof(isk), imck, sizeof(imck)) < 0) 716 return -1; 717 data->simck_idx++; 718 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 719 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 720 data->simck, EAP_FAST_SIMCK_LEN); 721 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 722 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 723 cmk, EAP_FAST_CMK_LEN); 724 725 return 0; 726 } 727 728 729 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 730 { 731 struct eap_tlv_hdr *pac; 732 struct eap_tlv_request_action_tlv *act; 733 struct eap_tlv_pac_type_tlv *type; 734 735 act = (struct eap_tlv_request_action_tlv *) pos; 736 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 737 act->length = host_to_be16(2); 738 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 739 740 pac = (struct eap_tlv_hdr *) (act + 1); 741 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 742 pac->length = host_to_be16(sizeof(*type)); 743 744 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 745 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 746 type->length = host_to_be16(2); 747 type->pac_type = host_to_be16(pac_type); 748 749 return (u8 *) (type + 1); 750 } 751 752 753 static struct wpabuf * eap_fast_process_crypto_binding( 754 struct eap_sm *sm, struct eap_fast_data *data, 755 struct eap_method_ret *ret, 756 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 757 { 758 struct wpabuf *resp; 759 u8 *pos; 760 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 761 int res; 762 size_t len; 763 764 if (eap_fast_validate_crypto_binding(_bind) < 0) 765 return NULL; 766 767 if (eap_fast_get_cmk(sm, data, cmk) < 0) 768 return NULL; 769 770 /* Validate received Compound MAC */ 771 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 772 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 773 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 774 "MAC calculation", (u8 *) _bind, bind_len); 775 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 776 _bind->compound_mac); 777 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 778 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 779 cmac, sizeof(cmac)); 780 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 781 _bind->compound_mac, sizeof(cmac)); 782 if (res != 0) { 783 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 784 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 785 return NULL; 786 } 787 788 /* 789 * Compound MAC was valid, so authentication succeeded. Reply with 790 * crypto binding to allow server to complete authentication. 791 */ 792 793 len = sizeof(struct eap_tlv_crypto_binding_tlv); 794 resp = wpabuf_alloc(len); 795 if (resp == NULL) 796 return NULL; 797 798 if (!data->anon_provisioning && data->phase2_success && 799 eap_fast_derive_msk(data) < 0) { 800 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 801 ret->methodState = METHOD_DONE; 802 ret->decision = DECISION_FAIL; 803 data->phase2_success = 0; 804 wpabuf_free(resp); 805 return NULL; 806 } 807 808 if (!data->anon_provisioning && data->phase2_success) { 809 os_free(data->session_id); 810 data->session_id = eap_peer_tls_derive_session_id( 811 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 812 if (data->session_id) { 813 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 814 data->session_id, data->id_len); 815 } else { 816 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 817 "Session-Id"); 818 wpabuf_free(resp); 819 return NULL; 820 } 821 } 822 823 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 824 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 825 pos, _bind, cmk); 826 827 return resp; 828 } 829 830 831 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 832 u8 *pos, size_t len, int *pac_key_found) 833 { 834 switch (type & 0x7fff) { 835 case PAC_TYPE_PAC_KEY: 836 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 837 if (len != EAP_FAST_PAC_KEY_LEN) { 838 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 839 "length %lu", (unsigned long) len); 840 break; 841 } 842 *pac_key_found = 1; 843 os_memcpy(entry->pac_key, pos, len); 844 break; 845 case PAC_TYPE_PAC_OPAQUE: 846 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 847 entry->pac_opaque = pos; 848 entry->pac_opaque_len = len; 849 break; 850 case PAC_TYPE_PAC_INFO: 851 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 852 entry->pac_info = pos; 853 entry->pac_info_len = len; 854 break; 855 default: 856 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 857 type); 858 break; 859 } 860 } 861 862 863 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 864 u8 *pac, size_t pac_len) 865 { 866 struct pac_tlv_hdr *hdr; 867 u8 *pos; 868 size_t left, len; 869 int type, pac_key_found = 0; 870 871 pos = pac; 872 left = pac_len; 873 874 while (left > sizeof(*hdr)) { 875 hdr = (struct pac_tlv_hdr *) pos; 876 type = be_to_host16(hdr->type); 877 len = be_to_host16(hdr->len); 878 pos += sizeof(*hdr); 879 left -= sizeof(*hdr); 880 if (len > left) { 881 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 882 "(type=%d len=%lu left=%lu)", 883 type, (unsigned long) len, 884 (unsigned long) left); 885 return -1; 886 } 887 888 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 889 890 pos += len; 891 left -= len; 892 } 893 894 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 895 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 896 "all the required fields"); 897 return -1; 898 } 899 900 return 0; 901 } 902 903 904 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 905 u8 *pos, size_t len) 906 { 907 u16 pac_type; 908 u32 lifetime; 909 struct os_time now; 910 911 switch (type & 0x7fff) { 912 case PAC_TYPE_CRED_LIFETIME: 913 if (len != 4) { 914 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 915 "Invalid CRED_LIFETIME length - ignored", 916 pos, len); 917 return 0; 918 } 919 920 /* 921 * This is not currently saved separately in PAC files since 922 * the server can automatically initiate PAC update when 923 * needed. Anyway, the information is available from PAC-Info 924 * dump if it is needed for something in the future. 925 */ 926 lifetime = WPA_GET_BE32(pos); 927 os_get_time(&now); 928 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 929 "(%d days)", 930 lifetime, (lifetime - (u32) now.sec) / 86400); 931 break; 932 case PAC_TYPE_A_ID: 933 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 934 pos, len); 935 entry->a_id = pos; 936 entry->a_id_len = len; 937 break; 938 case PAC_TYPE_I_ID: 939 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 940 pos, len); 941 entry->i_id = pos; 942 entry->i_id_len = len; 943 break; 944 case PAC_TYPE_A_ID_INFO: 945 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 946 pos, len); 947 entry->a_id_info = pos; 948 entry->a_id_info_len = len; 949 break; 950 case PAC_TYPE_PAC_TYPE: 951 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 952 if (len != 2) { 953 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 954 "length %lu (expected 2)", 955 (unsigned long) len); 956 wpa_hexdump_ascii(MSG_DEBUG, 957 "EAP-FAST: PAC-Info - PAC-Type", 958 pos, len); 959 return -1; 960 } 961 pac_type = WPA_GET_BE16(pos); 962 if (pac_type != PAC_TYPE_TUNNEL_PAC && 963 pac_type != PAC_TYPE_USER_AUTHORIZATION && 964 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 965 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 966 "%d", pac_type); 967 return -1; 968 } 969 970 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 971 pac_type); 972 entry->pac_type = pac_type; 973 break; 974 default: 975 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 976 "type %d", type); 977 break; 978 } 979 980 return 0; 981 } 982 983 984 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 985 { 986 struct pac_tlv_hdr *hdr; 987 u8 *pos; 988 size_t left, len; 989 int type; 990 991 /* RFC 5422, Section 4.2.4 */ 992 993 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 994 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 995 996 pos = entry->pac_info; 997 left = entry->pac_info_len; 998 while (left > sizeof(*hdr)) { 999 hdr = (struct pac_tlv_hdr *) pos; 1000 type = be_to_host16(hdr->type); 1001 len = be_to_host16(hdr->len); 1002 pos += sizeof(*hdr); 1003 left -= sizeof(*hdr); 1004 if (len > left) { 1005 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1006 "(type=%d len=%lu left=%lu)", 1007 type, (unsigned long) len, 1008 (unsigned long) left); 1009 return -1; 1010 } 1011 1012 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1013 return -1; 1014 1015 pos += len; 1016 left -= len; 1017 } 1018 1019 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1020 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1021 "all the required fields"); 1022 return -1; 1023 } 1024 1025 return 0; 1026 } 1027 1028 1029 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1030 struct eap_fast_data *data, 1031 struct eap_method_ret *ret, 1032 u8 *pac, size_t pac_len) 1033 { 1034 struct eap_peer_config *config = eap_get_config(sm); 1035 struct eap_fast_pac entry; 1036 1037 os_memset(&entry, 0, sizeof(entry)); 1038 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1039 eap_fast_process_pac_info(&entry)) 1040 return NULL; 1041 1042 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1043 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1044 if (data->use_pac_binary_format) 1045 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1046 else 1047 eap_fast_save_pac(sm, data->pac, config->pac_file); 1048 1049 if (data->provisioning) { 1050 if (data->anon_provisioning) { 1051 /* 1052 * Unauthenticated provisioning does not provide keying 1053 * material and must end with an EAP-Failure. 1054 * Authentication will be done separately after this. 1055 */ 1056 data->success = 0; 1057 ret->decision = DECISION_FAIL; 1058 } else { 1059 /* 1060 * Server may or may not allow authenticated 1061 * provisioning also for key generation. 1062 */ 1063 ret->decision = DECISION_COND_SUCC; 1064 } 1065 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1066 "- Provisioning completed successfully"); 1067 sm->expected_failure = 1; 1068 } else { 1069 /* 1070 * This is PAC refreshing, i.e., normal authentication that is 1071 * expected to be completed with an EAP-Success. However, 1072 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1073 * after protected success exchange in case of EAP-Fast 1074 * provisioning, so we better use DECISION_COND_SUCC here 1075 * instead of DECISION_UNCOND_SUCC. 1076 */ 1077 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1078 "- PAC refreshing completed successfully"); 1079 ret->decision = DECISION_COND_SUCC; 1080 } 1081 ret->methodState = METHOD_DONE; 1082 return eap_fast_tlv_pac_ack(); 1083 } 1084 1085 1086 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1087 struct eap_fast_tlv_parse *tlv, 1088 struct wpabuf **resp) 1089 { 1090 int mandatory, tlv_type, res; 1091 size_t len; 1092 u8 *pos, *end; 1093 1094 os_memset(tlv, 0, sizeof(*tlv)); 1095 1096 /* Parse TLVs from the decrypted Phase 2 data */ 1097 pos = wpabuf_mhead(decrypted); 1098 end = pos + wpabuf_len(decrypted); 1099 while (end - pos > 4) { 1100 mandatory = pos[0] & 0x80; 1101 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1102 pos += 2; 1103 len = WPA_GET_BE16(pos); 1104 pos += 2; 1105 if (len > (size_t) (end - pos)) { 1106 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1107 return -1; 1108 } 1109 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1110 "TLV type %d length %u%s", 1111 tlv_type, (unsigned int) len, 1112 mandatory ? " (mandatory)" : ""); 1113 1114 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1115 if (res == -2) 1116 break; 1117 if (res < 0) { 1118 if (mandatory) { 1119 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1120 "mandatory TLV type %d", tlv_type); 1121 *resp = eap_fast_tlv_nak(0, tlv_type); 1122 break; 1123 } else { 1124 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1125 "unknown optional TLV type %d", 1126 tlv_type); 1127 } 1128 } 1129 1130 pos += len; 1131 } 1132 1133 return 0; 1134 } 1135 1136 1137 static int eap_fast_encrypt_response(struct eap_sm *sm, 1138 struct eap_fast_data *data, 1139 struct wpabuf *resp, 1140 u8 identifier, struct wpabuf **out_data) 1141 { 1142 if (resp == NULL) 1143 return 0; 1144 1145 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1146 resp); 1147 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1148 data->fast_version, identifier, 1149 resp, out_data)) { 1150 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1151 "frame"); 1152 } 1153 wpabuf_free(resp); 1154 1155 return 0; 1156 } 1157 1158 1159 static struct wpabuf * eap_fast_pac_request(void) 1160 { 1161 struct wpabuf *tmp; 1162 u8 *pos, *pos2; 1163 1164 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1165 sizeof(struct eap_tlv_request_action_tlv) + 1166 sizeof(struct eap_tlv_pac_type_tlv)); 1167 if (tmp == NULL) 1168 return NULL; 1169 1170 pos = wpabuf_put(tmp, 0); 1171 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1172 wpabuf_put(tmp, pos2 - pos); 1173 return tmp; 1174 } 1175 1176 1177 static int eap_fast_process_decrypted(struct eap_sm *sm, 1178 struct eap_fast_data *data, 1179 struct eap_method_ret *ret, 1180 u8 identifier, 1181 struct wpabuf *decrypted, 1182 struct wpabuf **out_data) 1183 { 1184 struct wpabuf *resp = NULL, *tmp; 1185 struct eap_fast_tlv_parse tlv; 1186 int failed = 0; 1187 1188 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1189 return 0; 1190 if (resp) 1191 return eap_fast_encrypt_response(sm, data, resp, 1192 identifier, out_data); 1193 1194 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1195 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1196 return eap_fast_encrypt_response(sm, data, resp, 1197 identifier, out_data); 1198 } 1199 1200 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1201 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1202 return eap_fast_encrypt_response(sm, data, resp, 1203 identifier, out_data); 1204 } 1205 1206 if (tlv.crypto_binding) { 1207 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1208 tlv.crypto_binding, 1209 tlv.crypto_binding_len); 1210 if (tmp == NULL) 1211 failed = 1; 1212 else 1213 resp = wpabuf_concat(resp, tmp); 1214 } 1215 1216 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1217 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1218 EAP_TLV_RESULT_SUCCESS, 1); 1219 resp = wpabuf_concat(resp, tmp); 1220 } 1221 1222 if (tlv.eap_payload_tlv) { 1223 tmp = eap_fast_process_eap_payload_tlv( 1224 sm, data, ret, tlv.eap_payload_tlv, 1225 tlv.eap_payload_tlv_len); 1226 resp = wpabuf_concat(resp, tmp); 1227 } 1228 1229 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1230 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1231 "acknowledging success"); 1232 failed = 1; 1233 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1234 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1235 tlv.pac_len); 1236 resp = wpabuf_concat(resp, tmp); 1237 } 1238 1239 if (data->current_pac == NULL && data->provisioning && 1240 !data->anon_provisioning && !tlv.pac && 1241 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1242 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1243 /* 1244 * Need to request Tunnel PAC when using authenticated 1245 * provisioning. 1246 */ 1247 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1248 tmp = eap_fast_pac_request(); 1249 resp = wpabuf_concat(resp, tmp); 1250 } 1251 1252 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1253 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1254 resp = wpabuf_concat(tmp, resp); 1255 } else if (failed) { 1256 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1257 resp = wpabuf_concat(tmp, resp); 1258 } 1259 1260 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1261 tlv.crypto_binding && data->phase2_success) { 1262 if (data->anon_provisioning) { 1263 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1264 "provisioning completed successfully."); 1265 ret->methodState = METHOD_DONE; 1266 ret->decision = DECISION_FAIL; 1267 sm->expected_failure = 1; 1268 } else { 1269 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1270 "completed successfully."); 1271 if (data->provisioning) 1272 ret->methodState = METHOD_MAY_CONT; 1273 else 1274 ret->methodState = METHOD_DONE; 1275 ret->decision = DECISION_UNCOND_SUCC; 1276 } 1277 } 1278 1279 if (resp == NULL) { 1280 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1281 "empty response packet"); 1282 resp = wpabuf_alloc(1); 1283 } 1284 1285 return eap_fast_encrypt_response(sm, data, resp, identifier, 1286 out_data); 1287 } 1288 1289 1290 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1291 struct eap_method_ret *ret, u8 identifier, 1292 const struct wpabuf *in_data, 1293 struct wpabuf **out_data) 1294 { 1295 struct wpabuf *in_decrypted; 1296 int res; 1297 1298 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1299 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1300 1301 if (data->pending_phase2_req) { 1302 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1303 "skip decryption and use old data"); 1304 /* Clear TLS reassembly state. */ 1305 eap_peer_tls_reset_input(&data->ssl); 1306 1307 in_decrypted = data->pending_phase2_req; 1308 data->pending_phase2_req = NULL; 1309 goto continue_req; 1310 } 1311 1312 if (wpabuf_len(in_data) == 0) { 1313 /* Received TLS ACK - requesting more fragments */ 1314 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1315 data->fast_version, 1316 identifier, NULL, out_data); 1317 } 1318 1319 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1320 if (res) 1321 return res; 1322 1323 continue_req: 1324 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1325 in_decrypted); 1326 1327 if (wpabuf_len(in_decrypted) < 4) { 1328 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1329 "TLV frame (len=%lu)", 1330 (unsigned long) wpabuf_len(in_decrypted)); 1331 wpabuf_free(in_decrypted); 1332 return -1; 1333 } 1334 1335 res = eap_fast_process_decrypted(sm, data, ret, identifier, 1336 in_decrypted, out_data); 1337 1338 wpabuf_free(in_decrypted); 1339 1340 return res; 1341 } 1342 1343 1344 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1345 { 1346 const u8 *a_id; 1347 const struct pac_tlv_hdr *hdr; 1348 1349 /* 1350 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1351 * supports both raw A-ID and one inside an A-ID TLV. 1352 */ 1353 a_id = buf; 1354 *id_len = len; 1355 if (len > sizeof(*hdr)) { 1356 int tlen; 1357 hdr = (const struct pac_tlv_hdr *) buf; 1358 tlen = be_to_host16(hdr->len); 1359 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1360 sizeof(*hdr) + tlen <= len) { 1361 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1362 "(Start)"); 1363 a_id = (const u8 *) (hdr + 1); 1364 *id_len = tlen; 1365 } 1366 } 1367 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1368 1369 return a_id; 1370 } 1371 1372 1373 static void eap_fast_select_pac(struct eap_fast_data *data, 1374 const u8 *a_id, size_t a_id_len) 1375 { 1376 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1377 PAC_TYPE_TUNNEL_PAC); 1378 if (data->current_pac == NULL) { 1379 /* 1380 * Tunnel PAC was not available for this A-ID. Try to use 1381 * Machine Authentication PAC, if one is available. 1382 */ 1383 data->current_pac = eap_fast_get_pac( 1384 data->pac, a_id, a_id_len, 1385 PAC_TYPE_MACHINE_AUTHENTICATION); 1386 } 1387 1388 if (data->current_pac) { 1389 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1390 "(PAC-Type %d)", data->current_pac->pac_type); 1391 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1392 data->current_pac->a_id_info, 1393 data->current_pac->a_id_info_len); 1394 } 1395 } 1396 1397 1398 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1399 struct eap_fast_data *data, 1400 struct eap_fast_pac *pac) 1401 { 1402 u8 *tlv; 1403 size_t tlv_len, olen; 1404 struct eap_tlv_hdr *ehdr; 1405 1406 olen = pac->pac_opaque_len; 1407 tlv_len = sizeof(*ehdr) + olen; 1408 tlv = os_malloc(tlv_len); 1409 if (tlv) { 1410 ehdr = (struct eap_tlv_hdr *) tlv; 1411 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1412 ehdr->length = host_to_be16(olen); 1413 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1414 } 1415 if (tlv == NULL || 1416 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1417 TLS_EXT_PAC_OPAQUE, 1418 tlv, tlv_len) < 0) { 1419 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1420 "extension"); 1421 os_free(tlv); 1422 return -1; 1423 } 1424 os_free(tlv); 1425 1426 return 0; 1427 } 1428 1429 1430 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1431 struct eap_fast_data *data) 1432 { 1433 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1434 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1435 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1436 "TLS extension"); 1437 return -1; 1438 } 1439 return 0; 1440 } 1441 1442 1443 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1444 struct eap_fast_data *data) 1445 { 1446 u8 ciphers[7]; 1447 int count = 0; 1448 1449 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1450 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1451 "provisioning TLS cipher suites"); 1452 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1453 } 1454 1455 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1456 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1457 "provisioning TLS cipher suites"); 1458 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA; 1459 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1460 ciphers[count++] = TLS_CIPHER_AES256_SHA; 1461 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1462 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1463 } 1464 1465 ciphers[count++] = TLS_CIPHER_NONE; 1466 1467 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1468 ciphers)) { 1469 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1470 "cipher suites for provisioning"); 1471 return -1; 1472 } 1473 1474 return 0; 1475 } 1476 1477 1478 static int eap_fast_process_start(struct eap_sm *sm, 1479 struct eap_fast_data *data, u8 flags, 1480 const u8 *pos, size_t left) 1481 { 1482 const u8 *a_id; 1483 size_t a_id_len; 1484 1485 /* EAP-FAST Version negotiation (section 3.1) */ 1486 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1487 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1488 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1489 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1490 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1491 data->fast_version); 1492 1493 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1494 eap_fast_select_pac(data, a_id, a_id_len); 1495 1496 if (data->resuming && data->current_pac) { 1497 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1498 "do not add PAC-Opaque to TLS ClientHello"); 1499 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1500 return -1; 1501 } else if (data->current_pac) { 1502 /* 1503 * PAC found for the A-ID and we are not resuming an old 1504 * session, so add PAC-Opaque extension to ClientHello. 1505 */ 1506 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1507 return -1; 1508 } else { 1509 /* No PAC found, so we must provision one. */ 1510 if (!data->provisioning_allowed) { 1511 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1512 "provisioning disabled"); 1513 return -1; 1514 } 1515 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1516 "starting provisioning"); 1517 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1518 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1519 return -1; 1520 data->provisioning = 1; 1521 } 1522 1523 return 0; 1524 } 1525 1526 1527 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1528 struct eap_method_ret *ret, 1529 const struct wpabuf *reqData) 1530 { 1531 const struct eap_hdr *req; 1532 size_t left; 1533 int res; 1534 u8 flags, id; 1535 struct wpabuf *resp; 1536 const u8 *pos; 1537 struct eap_fast_data *data = priv; 1538 struct wpabuf msg; 1539 1540 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1541 reqData, &left, &flags); 1542 if (pos == NULL) 1543 return NULL; 1544 1545 req = wpabuf_head(reqData); 1546 id = req->identifier; 1547 1548 if (flags & EAP_TLS_FLAGS_START) { 1549 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1550 return NULL; 1551 1552 left = 0; /* A-ID is not used in further packet processing */ 1553 } 1554 1555 wpabuf_set(&msg, pos, left); 1556 1557 resp = NULL; 1558 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1559 !data->resuming) { 1560 /* Process tunneled (encrypted) phase 2 data. */ 1561 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1562 if (res < 0) { 1563 ret->methodState = METHOD_DONE; 1564 ret->decision = DECISION_FAIL; 1565 /* 1566 * Ack possible Alert that may have caused failure in 1567 * decryption. 1568 */ 1569 res = 1; 1570 } 1571 } else { 1572 if (sm->waiting_ext_cert_check && data->pending_resp) { 1573 struct eap_peer_config *config = eap_get_config(sm); 1574 1575 if (config->pending_ext_cert_check == 1576 EXT_CERT_CHECK_GOOD) { 1577 wpa_printf(MSG_DEBUG, 1578 "EAP-FAST: External certificate check succeeded - continue handshake"); 1579 resp = data->pending_resp; 1580 data->pending_resp = NULL; 1581 sm->waiting_ext_cert_check = 0; 1582 return resp; 1583 } 1584 1585 if (config->pending_ext_cert_check == 1586 EXT_CERT_CHECK_BAD) { 1587 wpa_printf(MSG_DEBUG, 1588 "EAP-FAST: External certificate check failed - force authentication failure"); 1589 ret->methodState = METHOD_DONE; 1590 ret->decision = DECISION_FAIL; 1591 sm->waiting_ext_cert_check = 0; 1592 return NULL; 1593 } 1594 1595 wpa_printf(MSG_DEBUG, 1596 "EAP-FAST: Continuing to wait external server certificate validation"); 1597 return NULL; 1598 } 1599 1600 /* Continue processing TLS handshake (phase 1). */ 1601 res = eap_peer_tls_process_helper(sm, &data->ssl, 1602 EAP_TYPE_FAST, 1603 data->fast_version, id, &msg, 1604 &resp); 1605 if (res < 0) { 1606 wpa_printf(MSG_DEBUG, 1607 "EAP-FAST: TLS processing failed"); 1608 ret->methodState = METHOD_DONE; 1609 ret->decision = DECISION_FAIL; 1610 return resp; 1611 } 1612 1613 if (sm->waiting_ext_cert_check) { 1614 wpa_printf(MSG_DEBUG, 1615 "EAP-FAST: Waiting external server certificate validation"); 1616 wpabuf_free(data->pending_resp); 1617 data->pending_resp = resp; 1618 return NULL; 1619 } 1620 1621 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1622 char cipher[80]; 1623 wpa_printf(MSG_DEBUG, 1624 "EAP-FAST: TLS done, proceed to Phase 2"); 1625 if (data->provisioning && 1626 (!(data->provisioning_allowed & 1627 EAP_FAST_PROV_AUTH) || 1628 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1629 cipher, sizeof(cipher)) < 0 || 1630 os_strstr(cipher, "ADH-") || 1631 os_strstr(cipher, "anon"))) { 1632 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1633 "anonymous (unauthenticated) " 1634 "provisioning"); 1635 data->anon_provisioning = 1; 1636 } else 1637 data->anon_provisioning = 0; 1638 data->resuming = 0; 1639 if (eap_fast_derive_keys(sm, data) < 0) { 1640 wpa_printf(MSG_DEBUG, 1641 "EAP-FAST: Could not derive keys"); 1642 ret->methodState = METHOD_DONE; 1643 ret->decision = DECISION_FAIL; 1644 wpabuf_free(resp); 1645 return NULL; 1646 } 1647 } 1648 1649 if (res == 2) { 1650 /* 1651 * Application data included in the handshake message. 1652 */ 1653 wpabuf_free(data->pending_phase2_req); 1654 data->pending_phase2_req = resp; 1655 resp = NULL; 1656 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp); 1657 } 1658 } 1659 1660 if (res == 1) { 1661 wpabuf_free(resp); 1662 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1663 data->fast_version); 1664 } 1665 1666 return resp; 1667 } 1668 1669 1670 #if 0 /* FIX */ 1671 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1672 { 1673 struct eap_fast_data *data = priv; 1674 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1675 } 1676 1677 1678 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1679 { 1680 struct eap_fast_data *data = priv; 1681 1682 if (data->phase2_priv && data->phase2_method && 1683 data->phase2_method->deinit_for_reauth) 1684 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv); 1685 os_free(data->key_block_p); 1686 data->key_block_p = NULL; 1687 wpabuf_free(data->pending_phase2_req); 1688 data->pending_phase2_req = NULL; 1689 wpabuf_free(data->pending_resp); 1690 data->pending_resp = NULL; 1691 } 1692 1693 1694 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1695 { 1696 struct eap_fast_data *data = priv; 1697 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1698 os_free(data); 1699 return NULL; 1700 } 1701 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1702 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1703 os_free(data->session_id); 1704 data->session_id = NULL; 1705 if (data->phase2_priv && data->phase2_method && 1706 data->phase2_method->init_for_reauth) 1707 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1708 data->phase2_success = 0; 1709 data->resuming = 1; 1710 data->provisioning = 0; 1711 data->anon_provisioning = 0; 1712 data->simck_idx = 0; 1713 return priv; 1714 } 1715 #endif 1716 1717 1718 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1719 size_t buflen, int verbose) 1720 { 1721 struct eap_fast_data *data = priv; 1722 int len, ret; 1723 1724 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1725 if (data->phase2_method) { 1726 ret = os_snprintf(buf + len, buflen - len, 1727 "EAP-FAST Phase2 method=%s\n", 1728 data->phase2_method->name); 1729 if (os_snprintf_error(buflen - len, ret)) 1730 return len; 1731 len += ret; 1732 } 1733 return len; 1734 } 1735 1736 1737 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1738 { 1739 struct eap_fast_data *data = priv; 1740 return data->success; 1741 } 1742 1743 1744 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1745 { 1746 struct eap_fast_data *data = priv; 1747 u8 *key; 1748 1749 if (!data->success) 1750 return NULL; 1751 1752 key = os_memdup(data->key_data, EAP_FAST_KEY_LEN); 1753 if (key == NULL) 1754 return NULL; 1755 1756 *len = EAP_FAST_KEY_LEN; 1757 1758 return key; 1759 } 1760 1761 1762 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1763 { 1764 struct eap_fast_data *data = priv; 1765 u8 *id; 1766 1767 if (!data->success || !data->session_id) 1768 return NULL; 1769 1770 id = os_memdup(data->session_id, data->id_len); 1771 if (id == NULL) 1772 return NULL; 1773 1774 *len = data->id_len; 1775 1776 return id; 1777 } 1778 1779 1780 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1781 { 1782 struct eap_fast_data *data = priv; 1783 u8 *key; 1784 1785 if (!data->success) 1786 return NULL; 1787 1788 key = os_memdup(data->emsk, EAP_EMSK_LEN); 1789 if (key == NULL) 1790 return NULL; 1791 1792 *len = EAP_EMSK_LEN; 1793 1794 return key; 1795 } 1796 1797 1798 int eap_peer_fast_register(void) 1799 { 1800 struct eap_method *eap; 1801 1802 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1803 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1804 if (eap == NULL) 1805 return -1; 1806 1807 eap->init = eap_fast_init; 1808 eap->deinit = eap_fast_deinit; 1809 eap->process = eap_fast_process; 1810 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1811 eap->getKey = eap_fast_getKey; 1812 eap->getSessionId = eap_fast_get_session_id; 1813 eap->get_status = eap_fast_get_status; 1814 #if 0 1815 eap->has_reauth_data = eap_fast_has_reauth_data; 1816 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1817 eap->init_for_reauth = eap_fast_init_for_reauth; 1818 #endif 1819 eap->get_emsk = eap_fast_get_emsk; 1820 1821 return eap_peer_method_register(eap); 1822 } 1823
