1 /* 2 * EAP peer method: EAP-FAST (RFC 4851) 3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/tls.h" 13 #include "crypto/sha1.h" 14 #include "eap_common/eap_tlv_common.h" 15 #include "eap_i.h" 16 #include "eap_tls_common.h" 17 #include "eap_config.h" 18 #include "eap_fast_pac.h" 19 20 #ifdef EAP_FAST_DYNAMIC 21 #include "eap_fast_pac.c" 22 #endif /* EAP_FAST_DYNAMIC */ 23 24 /* TODO: 25 * - test session resumption and enable it if it interoperates 26 * - password change (pending mschapv2 packet; replay decrypted packet) 27 */ 28 29 30 static void eap_fast_deinit(struct eap_sm *sm, void *priv); 31 32 33 struct eap_fast_data { 34 struct eap_ssl_data ssl; 35 36 int fast_version; 37 38 const struct eap_method *phase2_method; 39 void *phase2_priv; 40 int phase2_success; 41 42 struct eap_method_type phase2_type; 43 struct eap_method_type *phase2_types; 44 size_t num_phase2_types; 45 int resuming; /* starting a resumed session */ 46 struct eap_fast_key_block_provisioning *key_block_p; 47 #define EAP_FAST_PROV_UNAUTH 1 48 #define EAP_FAST_PROV_AUTH 2 49 int provisioning_allowed; /* Allowed PAC provisioning modes */ 50 int provisioning; /* doing PAC provisioning (not the normal auth) */ 51 int anon_provisioning; /* doing anonymous (unauthenticated) 52 * provisioning */ 53 int session_ticket_used; 54 55 u8 key_data[EAP_FAST_KEY_LEN]; 56 u8 *session_id; 57 size_t id_len; 58 u8 emsk[EAP_EMSK_LEN]; 59 int success; 60 61 struct eap_fast_pac *pac; 62 struct eap_fast_pac *current_pac; 63 size_t max_pac_list_len; 64 int use_pac_binary_format; 65 66 u8 simck[EAP_FAST_SIMCK_LEN]; 67 int simck_idx; 68 69 struct wpabuf *pending_phase2_req; 70 }; 71 72 73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 74 const u8 *client_random, 75 const u8 *server_random, 76 u8 *master_secret) 77 { 78 struct eap_fast_data *data = ctx; 79 80 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 81 82 if (client_random == NULL || server_random == NULL || 83 master_secret == NULL) { 84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall " 85 "back to full TLS handshake"); 86 data->session_ticket_used = 0; 87 if (data->provisioning_allowed) { 88 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a " 89 "new PAC-Key"); 90 data->provisioning = 1; 91 data->current_pac = NULL; 92 } 93 return 0; 94 } 95 96 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len); 97 98 if (data->current_pac == NULL) { 99 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for " 100 "using SessionTicket"); 101 data->session_ticket_used = 0; 102 return 0; 103 } 104 105 eap_fast_derive_master_secret(data->current_pac->pac_key, 106 server_random, client_random, 107 master_secret); 108 109 data->session_ticket_used = 1; 110 111 return 1; 112 } 113 114 115 static int eap_fast_parse_phase1(struct eap_fast_data *data, 116 const char *phase1) 117 { 118 const char *pos; 119 120 pos = os_strstr(phase1, "fast_provisioning="); 121 if (pos) { 122 data->provisioning_allowed = atoi(pos + 18); 123 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning " 124 "mode: %d", data->provisioning_allowed); 125 } 126 127 pos = os_strstr(phase1, "fast_max_pac_list_len="); 128 if (pos) { 129 data->max_pac_list_len = atoi(pos + 22); 130 if (data->max_pac_list_len == 0) 131 data->max_pac_list_len = 1; 132 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu", 133 (unsigned long) data->max_pac_list_len); 134 } 135 136 pos = os_strstr(phase1, "fast_pac_format=binary"); 137 if (pos) { 138 data->use_pac_binary_format = 1; 139 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC " 140 "list"); 141 } 142 143 return 0; 144 } 145 146 147 static void * eap_fast_init(struct eap_sm *sm) 148 { 149 struct eap_fast_data *data; 150 struct eap_peer_config *config = eap_get_config(sm); 151 152 data = os_zalloc(sizeof(*data)); 153 if (data == NULL) 154 return NULL; 155 data->fast_version = EAP_FAST_VERSION; 156 data->max_pac_list_len = 10; 157 158 if (config && config->phase1 && 159 eap_fast_parse_phase1(data, config->phase1) < 0) { 160 eap_fast_deinit(sm, data); 161 return NULL; 162 } 163 164 if (eap_peer_select_phase2_methods(config, "auth=", 165 &data->phase2_types, 166 &data->num_phase2_types) < 0) { 167 eap_fast_deinit(sm, data); 168 return NULL; 169 } 170 171 data->phase2_type.vendor = EAP_VENDOR_IETF; 172 data->phase2_type.method = EAP_TYPE_NONE; 173 174 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) { 175 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 176 eap_fast_deinit(sm, data); 177 return NULL; 178 } 179 180 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 181 eap_fast_session_ticket_cb, 182 data) < 0) { 183 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 184 "callback"); 185 eap_fast_deinit(sm, data); 186 return NULL; 187 } 188 189 /* 190 * The local RADIUS server in a Cisco AP does not seem to like empty 191 * fragments before data, so disable that workaround for CBC. 192 * TODO: consider making this configurable 193 */ 194 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) { 195 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS " 196 "workarounds"); 197 } 198 199 if (!config->pac_file) { 200 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured"); 201 eap_fast_deinit(sm, data); 202 return NULL; 203 } 204 205 if (data->use_pac_binary_format && 206 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) { 207 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 208 eap_fast_deinit(sm, data); 209 return NULL; 210 } 211 212 if (!data->use_pac_binary_format && 213 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) { 214 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 215 eap_fast_deinit(sm, data); 216 return NULL; 217 } 218 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 219 220 if (data->pac == NULL && !data->provisioning_allowed) { 221 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and " 222 "provisioning disabled"); 223 eap_fast_deinit(sm, data); 224 return NULL; 225 } 226 227 return data; 228 } 229 230 231 static void eap_fast_deinit(struct eap_sm *sm, void *priv) 232 { 233 struct eap_fast_data *data = priv; 234 struct eap_fast_pac *pac, *prev; 235 236 if (data == NULL) 237 return; 238 if (data->phase2_priv && data->phase2_method) 239 data->phase2_method->deinit(sm, data->phase2_priv); 240 os_free(data->phase2_types); 241 os_free(data->key_block_p); 242 eap_peer_tls_ssl_deinit(sm, &data->ssl); 243 244 pac = data->pac; 245 prev = NULL; 246 while (pac) { 247 prev = pac; 248 pac = pac->next; 249 eap_fast_free_pac(prev); 250 } 251 os_free(data->session_id); 252 wpabuf_free(data->pending_phase2_req); 253 os_free(data); 254 } 255 256 257 static int eap_fast_derive_msk(struct eap_fast_data *data) 258 { 259 eap_fast_derive_eap_msk(data->simck, data->key_data); 260 eap_fast_derive_eap_emsk(data->simck, data->emsk); 261 data->success = 1; 262 return 0; 263 } 264 265 266 static void eap_fast_derive_key_auth(struct eap_sm *sm, 267 struct eap_fast_data *data) 268 { 269 u8 *sks; 270 271 /* RFC 4851, Section 5.1: 272 * Extra key material after TLS key_block: session_key_seed[40] 273 */ 274 275 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion", 276 EAP_FAST_SKS_LEN); 277 if (sks == NULL) { 278 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 279 "session_key_seed"); 280 return; 281 } 282 283 /* 284 * RFC 4851, Section 5.2: 285 * S-IMCK[0] = session_key_seed 286 */ 287 wpa_hexdump_key(MSG_DEBUG, 288 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 289 sks, EAP_FAST_SKS_LEN); 290 data->simck_idx = 0; 291 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 292 os_free(sks); 293 } 294 295 296 static void eap_fast_derive_key_provisioning(struct eap_sm *sm, 297 struct eap_fast_data *data) 298 { 299 os_free(data->key_block_p); 300 data->key_block_p = (struct eap_fast_key_block_provisioning *) 301 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 302 "key expansion", 303 sizeof(*data->key_block_p)); 304 if (data->key_block_p == NULL) { 305 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 306 return; 307 } 308 /* 309 * RFC 4851, Section 5.2: 310 * S-IMCK[0] = session_key_seed 311 */ 312 wpa_hexdump_key(MSG_DEBUG, 313 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 314 data->key_block_p->session_key_seed, 315 sizeof(data->key_block_p->session_key_seed)); 316 data->simck_idx = 0; 317 os_memcpy(data->simck, data->key_block_p->session_key_seed, 318 EAP_FAST_SIMCK_LEN); 319 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 320 data->key_block_p->server_challenge, 321 sizeof(data->key_block_p->server_challenge)); 322 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 323 data->key_block_p->client_challenge, 324 sizeof(data->key_block_p->client_challenge)); 325 } 326 327 328 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 329 { 330 if (data->anon_provisioning) 331 eap_fast_derive_key_provisioning(sm, data); 332 else 333 eap_fast_derive_key_auth(sm, data); 334 } 335 336 337 static int eap_fast_init_phase2_method(struct eap_sm *sm, 338 struct eap_fast_data *data) 339 { 340 data->phase2_method = 341 eap_peer_get_eap_method(data->phase2_type.vendor, 342 data->phase2_type.method); 343 if (data->phase2_method == NULL) 344 return -1; 345 346 if (data->key_block_p) { 347 sm->auth_challenge = data->key_block_p->server_challenge; 348 sm->peer_challenge = data->key_block_p->client_challenge; 349 } 350 sm->init_phase2 = 1; 351 data->phase2_priv = data->phase2_method->init(sm); 352 sm->init_phase2 = 0; 353 sm->auth_challenge = NULL; 354 sm->peer_challenge = NULL; 355 356 return data->phase2_priv == NULL ? -1 : 0; 357 } 358 359 360 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type) 361 { 362 size_t i; 363 364 /* TODO: TNC with anonymous provisioning; need to require both 365 * completed MSCHAPv2 and TNC */ 366 367 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) { 368 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 369 "during unauthenticated provisioning; reject phase2" 370 " type %d", type); 371 return -1; 372 } 373 374 #ifdef EAP_TNC 375 if (type == EAP_TYPE_TNC) { 376 data->phase2_type.vendor = EAP_VENDOR_IETF; 377 data->phase2_type.method = EAP_TYPE_TNC; 378 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 379 "vendor %d method %d for TNC", 380 data->phase2_type.vendor, 381 data->phase2_type.method); 382 return 0; 383 } 384 #endif /* EAP_TNC */ 385 386 for (i = 0; i < data->num_phase2_types; i++) { 387 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 388 data->phase2_types[i].method != type) 389 continue; 390 391 data->phase2_type.vendor = data->phase2_types[i].vendor; 392 data->phase2_type.method = data->phase2_types[i].method; 393 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 394 "vendor %d method %d", 395 data->phase2_type.vendor, 396 data->phase2_type.method); 397 break; 398 } 399 400 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 401 return -1; 402 403 return 0; 404 } 405 406 407 static int eap_fast_phase2_request(struct eap_sm *sm, 408 struct eap_fast_data *data, 409 struct eap_method_ret *ret, 410 struct eap_hdr *hdr, 411 struct wpabuf **resp) 412 { 413 size_t len = be_to_host16(hdr->length); 414 u8 *pos; 415 struct eap_method_ret iret; 416 struct eap_peer_config *config = eap_get_config(sm); 417 struct wpabuf msg; 418 419 if (len <= sizeof(struct eap_hdr)) { 420 wpa_printf(MSG_INFO, "EAP-FAST: too short " 421 "Phase 2 request (len=%lu)", (unsigned long) len); 422 return -1; 423 } 424 pos = (u8 *) (hdr + 1); 425 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 426 if (*pos == EAP_TYPE_IDENTITY) { 427 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 428 return 0; 429 } 430 431 if (data->phase2_priv && data->phase2_method && 432 *pos != data->phase2_type.method) { 433 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 434 "deinitialize previous method"); 435 data->phase2_method->deinit(sm, data->phase2_priv); 436 data->phase2_method = NULL; 437 data->phase2_priv = NULL; 438 data->phase2_type.vendor = EAP_VENDOR_IETF; 439 data->phase2_type.method = EAP_TYPE_NONE; 440 } 441 442 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 443 data->phase2_type.method == EAP_TYPE_NONE && 444 eap_fast_select_phase2_method(data, *pos) < 0) { 445 if (eap_peer_tls_phase2_nak(data->phase2_types, 446 data->num_phase2_types, 447 hdr, resp)) 448 return -1; 449 return 0; 450 } 451 452 if ((data->phase2_priv == NULL && 453 eap_fast_init_phase2_method(sm, data) < 0) || 454 data->phase2_method == NULL) { 455 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 456 "Phase 2 EAP method %d", *pos); 457 ret->methodState = METHOD_DONE; 458 ret->decision = DECISION_FAIL; 459 return -1; 460 } 461 462 os_memset(&iret, 0, sizeof(iret)); 463 wpabuf_set(&msg, hdr, len); 464 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 465 &msg); 466 if (*resp == NULL || 467 (iret.methodState == METHOD_DONE && 468 iret.decision == DECISION_FAIL)) { 469 ret->methodState = METHOD_DONE; 470 ret->decision = DECISION_FAIL; 471 } else if ((iret.methodState == METHOD_DONE || 472 iret.methodState == METHOD_MAY_CONT) && 473 (iret.decision == DECISION_UNCOND_SUCC || 474 iret.decision == DECISION_COND_SUCC)) { 475 data->phase2_success = 1; 476 } 477 478 if (*resp == NULL && config && 479 (config->pending_req_identity || config->pending_req_password || 480 config->pending_req_otp || config->pending_req_new_password)) { 481 wpabuf_free(data->pending_phase2_req); 482 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 483 } else if (*resp == NULL) 484 return -1; 485 486 return 0; 487 } 488 489 490 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 491 { 492 struct wpabuf *buf; 493 struct eap_tlv_nak_tlv *nak; 494 buf = wpabuf_alloc(sizeof(*nak)); 495 if (buf == NULL) 496 return NULL; 497 nak = wpabuf_put(buf, sizeof(*nak)); 498 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 499 nak->length = host_to_be16(6); 500 nak->vendor_id = host_to_be32(vendor_id); 501 nak->nak_type = host_to_be16(tlv_type); 502 return buf; 503 } 504 505 506 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 507 { 508 struct wpabuf *buf; 509 struct eap_tlv_intermediate_result_tlv *result; 510 buf = wpabuf_alloc(sizeof(*result)); 511 if (buf == NULL) 512 return NULL; 513 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 514 intermediate ? "Intermediate " : "", status); 515 result = wpabuf_put(buf, sizeof(*result)); 516 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 517 (intermediate ? 518 EAP_TLV_INTERMEDIATE_RESULT_TLV : 519 EAP_TLV_RESULT_TLV)); 520 result->length = host_to_be16(2); 521 result->status = host_to_be16(status); 522 return buf; 523 } 524 525 526 static struct wpabuf * eap_fast_tlv_pac_ack(void) 527 { 528 struct wpabuf *buf; 529 struct eap_tlv_result_tlv *res; 530 struct eap_tlv_pac_ack_tlv *ack; 531 532 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 533 if (buf == NULL) 534 return NULL; 535 536 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 537 ack = wpabuf_put(buf, sizeof(*ack)); 538 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 539 EAP_TLV_TYPE_MANDATORY); 540 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 541 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 542 ack->pac_len = host_to_be16(2); 543 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 544 545 return buf; 546 } 547 548 549 static struct wpabuf * eap_fast_process_eap_payload_tlv( 550 struct eap_sm *sm, struct eap_fast_data *data, 551 struct eap_method_ret *ret, 552 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 553 { 554 struct eap_hdr *hdr; 555 struct wpabuf *resp = NULL; 556 557 if (eap_payload_tlv_len < sizeof(*hdr)) { 558 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 559 "Payload TLV (len=%lu)", 560 (unsigned long) eap_payload_tlv_len); 561 return NULL; 562 } 563 564 hdr = (struct eap_hdr *) eap_payload_tlv; 565 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 566 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 567 "EAP Payload TLV"); 568 return NULL; 569 } 570 571 if (hdr->code != EAP_CODE_REQUEST) { 572 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 573 "Phase 2 EAP header", hdr->code); 574 return NULL; 575 } 576 577 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 578 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 579 "failed"); 580 return NULL; 581 } 582 583 return eap_fast_tlv_eap_payload(resp); 584 } 585 586 587 static int eap_fast_validate_crypto_binding( 588 struct eap_tlv_crypto_binding_tlv *_bind) 589 { 590 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 591 "Received Version %d SubType %d", 592 _bind->version, _bind->received_version, _bind->subtype); 593 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 594 _bind->nonce, sizeof(_bind->nonce)); 595 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 596 _bind->compound_mac, sizeof(_bind->compound_mac)); 597 598 if (_bind->version != EAP_FAST_VERSION || 599 _bind->received_version != EAP_FAST_VERSION || 600 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 601 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 602 "Crypto-Binding TLV: Version %d " 603 "Received Version %d SubType %d", 604 _bind->version, _bind->received_version, 605 _bind->subtype); 606 return -1; 607 } 608 609 return 0; 610 } 611 612 613 static void eap_fast_write_crypto_binding( 614 struct eap_tlv_crypto_binding_tlv *rbind, 615 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 616 { 617 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 618 EAP_TLV_CRYPTO_BINDING_TLV); 619 rbind->length = host_to_be16(sizeof(*rbind) - 620 sizeof(struct eap_tlv_hdr)); 621 rbind->version = EAP_FAST_VERSION; 622 rbind->received_version = _bind->version; 623 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 624 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 625 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 626 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 627 rbind->compound_mac); 628 629 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 630 "Received Version %d SubType %d", 631 rbind->version, rbind->received_version, rbind->subtype); 632 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 633 rbind->nonce, sizeof(rbind->nonce)); 634 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 635 rbind->compound_mac, sizeof(rbind->compound_mac)); 636 } 637 638 639 static int eap_fast_get_phase2_key(struct eap_sm *sm, 640 struct eap_fast_data *data, 641 u8 *isk, size_t isk_len) 642 { 643 u8 *key; 644 size_t key_len; 645 646 os_memset(isk, 0, isk_len); 647 648 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 649 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 650 "available"); 651 return -1; 652 } 653 654 if (data->phase2_method->isKeyAvailable == NULL || 655 data->phase2_method->getKey == NULL) 656 return 0; 657 658 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 659 (key = data->phase2_method->getKey(sm, data->phase2_priv, 660 &key_len)) == NULL) { 661 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 662 "from Phase 2"); 663 return -1; 664 } 665 666 if (key_len > isk_len) 667 key_len = isk_len; 668 if (key_len == 32 && 669 data->phase2_method->vendor == EAP_VENDOR_IETF && 670 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 671 /* 672 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 673 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 674 * ISK for EAP-FAST cryptobinding. 675 */ 676 os_memcpy(isk, key + 16, 16); 677 os_memcpy(isk + 16, key, 16); 678 } else 679 os_memcpy(isk, key, key_len); 680 os_free(key); 681 682 return 0; 683 } 684 685 686 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 687 u8 *cmk) 688 { 689 u8 isk[32], imck[60]; 690 691 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 692 "calculation", data->simck_idx + 1); 693 694 /* 695 * RFC 4851, Section 5.2: 696 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 697 * MSK[j], 60) 698 * S-IMCK[j] = first 40 octets of IMCK[j] 699 * CMK[j] = last 20 octets of IMCK[j] 700 */ 701 702 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 703 return -1; 704 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 705 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 706 "Inner Methods Compound Keys", 707 isk, sizeof(isk), imck, sizeof(imck)); 708 data->simck_idx++; 709 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 710 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 711 data->simck, EAP_FAST_SIMCK_LEN); 712 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 713 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 714 cmk, EAP_FAST_CMK_LEN); 715 716 return 0; 717 } 718 719 720 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 721 { 722 struct eap_tlv_hdr *pac; 723 struct eap_tlv_request_action_tlv *act; 724 struct eap_tlv_pac_type_tlv *type; 725 726 act = (struct eap_tlv_request_action_tlv *) pos; 727 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 728 act->length = host_to_be16(2); 729 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 730 731 pac = (struct eap_tlv_hdr *) (act + 1); 732 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 733 pac->length = host_to_be16(sizeof(*type)); 734 735 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 736 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 737 type->length = host_to_be16(2); 738 type->pac_type = host_to_be16(pac_type); 739 740 return (u8 *) (type + 1); 741 } 742 743 744 static struct wpabuf * eap_fast_process_crypto_binding( 745 struct eap_sm *sm, struct eap_fast_data *data, 746 struct eap_method_ret *ret, 747 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 748 { 749 struct wpabuf *resp; 750 u8 *pos; 751 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 752 int res; 753 size_t len; 754 755 if (eap_fast_validate_crypto_binding(_bind) < 0) 756 return NULL; 757 758 if (eap_fast_get_cmk(sm, data, cmk) < 0) 759 return NULL; 760 761 /* Validate received Compound MAC */ 762 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 763 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 764 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 765 "MAC calculation", (u8 *) _bind, bind_len); 766 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 767 _bind->compound_mac); 768 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac)); 769 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 770 cmac, sizeof(cmac)); 771 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 772 _bind->compound_mac, sizeof(cmac)); 773 if (res != 0) { 774 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 775 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 776 return NULL; 777 } 778 779 /* 780 * Compound MAC was valid, so authentication succeeded. Reply with 781 * crypto binding to allow server to complete authentication. 782 */ 783 784 len = sizeof(struct eap_tlv_crypto_binding_tlv); 785 resp = wpabuf_alloc(len); 786 if (resp == NULL) 787 return NULL; 788 789 if (!data->anon_provisioning && data->phase2_success && 790 eap_fast_derive_msk(data) < 0) { 791 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 792 ret->methodState = METHOD_DONE; 793 ret->decision = DECISION_FAIL; 794 data->phase2_success = 0; 795 wpabuf_free(resp); 796 return NULL; 797 } 798 799 if (!data->anon_provisioning && data->phase2_success) { 800 os_free(data->session_id); 801 data->session_id = eap_peer_tls_derive_session_id( 802 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 803 if (data->session_id) { 804 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 805 data->session_id, data->id_len); 806 } else { 807 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 808 "Session-Id"); 809 wpabuf_free(resp); 810 return NULL; 811 } 812 } 813 814 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 815 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 816 pos, _bind, cmk); 817 818 return resp; 819 } 820 821 822 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 823 u8 *pos, size_t len, int *pac_key_found) 824 { 825 switch (type & 0x7fff) { 826 case PAC_TYPE_PAC_KEY: 827 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 828 if (len != EAP_FAST_PAC_KEY_LEN) { 829 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 830 "length %lu", (unsigned long) len); 831 break; 832 } 833 *pac_key_found = 1; 834 os_memcpy(entry->pac_key, pos, len); 835 break; 836 case PAC_TYPE_PAC_OPAQUE: 837 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 838 entry->pac_opaque = pos; 839 entry->pac_opaque_len = len; 840 break; 841 case PAC_TYPE_PAC_INFO: 842 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 843 entry->pac_info = pos; 844 entry->pac_info_len = len; 845 break; 846 default: 847 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 848 type); 849 break; 850 } 851 } 852 853 854 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 855 u8 *pac, size_t pac_len) 856 { 857 struct pac_tlv_hdr *hdr; 858 u8 *pos; 859 size_t left, len; 860 int type, pac_key_found = 0; 861 862 pos = pac; 863 left = pac_len; 864 865 while (left > sizeof(*hdr)) { 866 hdr = (struct pac_tlv_hdr *) pos; 867 type = be_to_host16(hdr->type); 868 len = be_to_host16(hdr->len); 869 pos += sizeof(*hdr); 870 left -= sizeof(*hdr); 871 if (len > left) { 872 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 873 "(type=%d len=%lu left=%lu)", 874 type, (unsigned long) len, 875 (unsigned long) left); 876 return -1; 877 } 878 879 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 880 881 pos += len; 882 left -= len; 883 } 884 885 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 886 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 887 "all the required fields"); 888 return -1; 889 } 890 891 return 0; 892 } 893 894 895 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 896 u8 *pos, size_t len) 897 { 898 u16 pac_type; 899 u32 lifetime; 900 struct os_time now; 901 902 switch (type & 0x7fff) { 903 case PAC_TYPE_CRED_LIFETIME: 904 if (len != 4) { 905 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 906 "Invalid CRED_LIFETIME length - ignored", 907 pos, len); 908 return 0; 909 } 910 911 /* 912 * This is not currently saved separately in PAC files since 913 * the server can automatically initiate PAC update when 914 * needed. Anyway, the information is available from PAC-Info 915 * dump if it is needed for something in the future. 916 */ 917 lifetime = WPA_GET_BE32(pos); 918 os_get_time(&now); 919 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 920 "(%d days)", 921 lifetime, (lifetime - (u32) now.sec) / 86400); 922 break; 923 case PAC_TYPE_A_ID: 924 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 925 pos, len); 926 entry->a_id = pos; 927 entry->a_id_len = len; 928 break; 929 case PAC_TYPE_I_ID: 930 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 931 pos, len); 932 entry->i_id = pos; 933 entry->i_id_len = len; 934 break; 935 case PAC_TYPE_A_ID_INFO: 936 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 937 pos, len); 938 entry->a_id_info = pos; 939 entry->a_id_info_len = len; 940 break; 941 case PAC_TYPE_PAC_TYPE: 942 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 943 if (len != 2) { 944 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 945 "length %lu (expected 2)", 946 (unsigned long) len); 947 wpa_hexdump_ascii(MSG_DEBUG, 948 "EAP-FAST: PAC-Info - PAC-Type", 949 pos, len); 950 return -1; 951 } 952 pac_type = WPA_GET_BE16(pos); 953 if (pac_type != PAC_TYPE_TUNNEL_PAC && 954 pac_type != PAC_TYPE_USER_AUTHORIZATION && 955 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 956 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 957 "%d", pac_type); 958 return -1; 959 } 960 961 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 962 pac_type); 963 entry->pac_type = pac_type; 964 break; 965 default: 966 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 967 "type %d", type); 968 break; 969 } 970 971 return 0; 972 } 973 974 975 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 976 { 977 struct pac_tlv_hdr *hdr; 978 u8 *pos; 979 size_t left, len; 980 int type; 981 982 /* RFC 5422, Section 4.2.4 */ 983 984 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 985 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 986 987 pos = entry->pac_info; 988 left = entry->pac_info_len; 989 while (left > sizeof(*hdr)) { 990 hdr = (struct pac_tlv_hdr *) pos; 991 type = be_to_host16(hdr->type); 992 len = be_to_host16(hdr->len); 993 pos += sizeof(*hdr); 994 left -= sizeof(*hdr); 995 if (len > left) { 996 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 997 "(type=%d len=%lu left=%lu)", 998 type, (unsigned long) len, 999 (unsigned long) left); 1000 return -1; 1001 } 1002 1003 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1004 return -1; 1005 1006 pos += len; 1007 left -= len; 1008 } 1009 1010 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1011 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1012 "all the required fields"); 1013 return -1; 1014 } 1015 1016 return 0; 1017 } 1018 1019 1020 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1021 struct eap_fast_data *data, 1022 struct eap_method_ret *ret, 1023 u8 *pac, size_t pac_len) 1024 { 1025 struct eap_peer_config *config = eap_get_config(sm); 1026 struct eap_fast_pac entry; 1027 1028 os_memset(&entry, 0, sizeof(entry)); 1029 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1030 eap_fast_process_pac_info(&entry)) 1031 return NULL; 1032 1033 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1034 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1035 if (data->use_pac_binary_format) 1036 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1037 else 1038 eap_fast_save_pac(sm, data->pac, config->pac_file); 1039 1040 if (data->provisioning) { 1041 if (data->anon_provisioning) { 1042 /* 1043 * Unauthenticated provisioning does not provide keying 1044 * material and must end with an EAP-Failure. 1045 * Authentication will be done separately after this. 1046 */ 1047 data->success = 0; 1048 ret->decision = DECISION_FAIL; 1049 } else { 1050 /* 1051 * Server may or may not allow authenticated 1052 * provisioning also for key generation. 1053 */ 1054 ret->decision = DECISION_COND_SUCC; 1055 } 1056 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1057 "- Provisioning completed successfully"); 1058 sm->expected_failure = 1; 1059 } else { 1060 /* 1061 * This is PAC refreshing, i.e., normal authentication that is 1062 * expected to be completed with an EAP-Success. However, 1063 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1064 * after protected success exchange in case of EAP-Fast 1065 * provisioning, so we better use DECISION_COND_SUCC here 1066 * instead of DECISION_UNCOND_SUCC. 1067 */ 1068 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1069 "- PAC refreshing completed successfully"); 1070 ret->decision = DECISION_COND_SUCC; 1071 } 1072 ret->methodState = METHOD_DONE; 1073 return eap_fast_tlv_pac_ack(); 1074 } 1075 1076 1077 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1078 struct eap_fast_tlv_parse *tlv, 1079 struct wpabuf **resp) 1080 { 1081 int mandatory, tlv_type, len, res; 1082 u8 *pos, *end; 1083 1084 os_memset(tlv, 0, sizeof(*tlv)); 1085 1086 /* Parse TLVs from the decrypted Phase 2 data */ 1087 pos = wpabuf_mhead(decrypted); 1088 end = pos + wpabuf_len(decrypted); 1089 while (pos + 4 < end) { 1090 mandatory = pos[0] & 0x80; 1091 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1092 pos += 2; 1093 len = WPA_GET_BE16(pos); 1094 pos += 2; 1095 if (pos + len > end) { 1096 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1097 return -1; 1098 } 1099 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1100 "TLV type %d length %d%s", 1101 tlv_type, len, mandatory ? " (mandatory)" : ""); 1102 1103 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1104 if (res == -2) 1105 break; 1106 if (res < 0) { 1107 if (mandatory) { 1108 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1109 "mandatory TLV type %d", tlv_type); 1110 *resp = eap_fast_tlv_nak(0, tlv_type); 1111 break; 1112 } else { 1113 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1114 "unknown optional TLV type %d", 1115 tlv_type); 1116 } 1117 } 1118 1119 pos += len; 1120 } 1121 1122 return 0; 1123 } 1124 1125 1126 static int eap_fast_encrypt_response(struct eap_sm *sm, 1127 struct eap_fast_data *data, 1128 struct wpabuf *resp, 1129 u8 identifier, struct wpabuf **out_data) 1130 { 1131 if (resp == NULL) 1132 return 0; 1133 1134 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1135 resp); 1136 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1137 data->fast_version, identifier, 1138 resp, out_data)) { 1139 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1140 "frame"); 1141 } 1142 wpabuf_free(resp); 1143 1144 return 0; 1145 } 1146 1147 1148 static struct wpabuf * eap_fast_pac_request(void) 1149 { 1150 struct wpabuf *tmp; 1151 u8 *pos, *pos2; 1152 1153 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1154 sizeof(struct eap_tlv_request_action_tlv) + 1155 sizeof(struct eap_tlv_pac_type_tlv)); 1156 if (tmp == NULL) 1157 return NULL; 1158 1159 pos = wpabuf_put(tmp, 0); 1160 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1161 wpabuf_put(tmp, pos2 - pos); 1162 return tmp; 1163 } 1164 1165 1166 static int eap_fast_process_decrypted(struct eap_sm *sm, 1167 struct eap_fast_data *data, 1168 struct eap_method_ret *ret, 1169 const struct eap_hdr *req, 1170 struct wpabuf *decrypted, 1171 struct wpabuf **out_data) 1172 { 1173 struct wpabuf *resp = NULL, *tmp; 1174 struct eap_fast_tlv_parse tlv; 1175 int failed = 0; 1176 1177 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1178 return 0; 1179 if (resp) 1180 return eap_fast_encrypt_response(sm, data, resp, 1181 req->identifier, out_data); 1182 1183 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1184 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1185 return eap_fast_encrypt_response(sm, data, resp, 1186 req->identifier, out_data); 1187 } 1188 1189 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1190 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1191 return eap_fast_encrypt_response(sm, data, resp, 1192 req->identifier, out_data); 1193 } 1194 1195 if (tlv.crypto_binding) { 1196 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1197 tlv.crypto_binding, 1198 tlv.crypto_binding_len); 1199 if (tmp == NULL) 1200 failed = 1; 1201 else 1202 resp = wpabuf_concat(resp, tmp); 1203 } 1204 1205 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1206 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1207 EAP_TLV_RESULT_SUCCESS, 1); 1208 resp = wpabuf_concat(resp, tmp); 1209 } 1210 1211 if (tlv.eap_payload_tlv) { 1212 tmp = eap_fast_process_eap_payload_tlv( 1213 sm, data, ret, tlv.eap_payload_tlv, 1214 tlv.eap_payload_tlv_len); 1215 resp = wpabuf_concat(resp, tmp); 1216 } 1217 1218 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1219 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1220 "acknowledging success"); 1221 failed = 1; 1222 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1223 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1224 tlv.pac_len); 1225 resp = wpabuf_concat(resp, tmp); 1226 } 1227 1228 if (data->current_pac == NULL && data->provisioning && 1229 !data->anon_provisioning && !tlv.pac && 1230 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1231 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1232 /* 1233 * Need to request Tunnel PAC when using authenticated 1234 * provisioning. 1235 */ 1236 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1237 tmp = eap_fast_pac_request(); 1238 resp = wpabuf_concat(resp, tmp); 1239 } 1240 1241 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1242 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1243 resp = wpabuf_concat(tmp, resp); 1244 } else if (failed) { 1245 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1246 resp = wpabuf_concat(tmp, resp); 1247 } 1248 1249 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1250 tlv.crypto_binding && data->phase2_success) { 1251 if (data->anon_provisioning) { 1252 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1253 "provisioning completed successfully."); 1254 ret->methodState = METHOD_DONE; 1255 ret->decision = DECISION_FAIL; 1256 sm->expected_failure = 1; 1257 } else { 1258 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1259 "completed successfully."); 1260 if (data->provisioning) 1261 ret->methodState = METHOD_MAY_CONT; 1262 else 1263 ret->methodState = METHOD_DONE; 1264 ret->decision = DECISION_UNCOND_SUCC; 1265 } 1266 } 1267 1268 if (resp == NULL) { 1269 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1270 "empty response packet"); 1271 resp = wpabuf_alloc(1); 1272 } 1273 1274 return eap_fast_encrypt_response(sm, data, resp, req->identifier, 1275 out_data); 1276 } 1277 1278 1279 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1280 struct eap_method_ret *ret, 1281 const struct eap_hdr *req, 1282 const struct wpabuf *in_data, 1283 struct wpabuf **out_data) 1284 { 1285 struct wpabuf *in_decrypted; 1286 int res; 1287 1288 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1289 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1290 1291 if (data->pending_phase2_req) { 1292 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1293 "skip decryption and use old data"); 1294 /* Clear TLS reassembly state. */ 1295 eap_peer_tls_reset_input(&data->ssl); 1296 1297 in_decrypted = data->pending_phase2_req; 1298 data->pending_phase2_req = NULL; 1299 goto continue_req; 1300 } 1301 1302 if (wpabuf_len(in_data) == 0) { 1303 /* Received TLS ACK - requesting more fragments */ 1304 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1305 data->fast_version, 1306 req->identifier, NULL, out_data); 1307 } 1308 1309 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1310 if (res) 1311 return res; 1312 1313 continue_req: 1314 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1315 in_decrypted); 1316 1317 if (wpabuf_len(in_decrypted) < 4) { 1318 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1319 "TLV frame (len=%lu)", 1320 (unsigned long) wpabuf_len(in_decrypted)); 1321 wpabuf_free(in_decrypted); 1322 return -1; 1323 } 1324 1325 res = eap_fast_process_decrypted(sm, data, ret, req, 1326 in_decrypted, out_data); 1327 1328 wpabuf_free(in_decrypted); 1329 1330 return res; 1331 } 1332 1333 1334 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1335 { 1336 const u8 *a_id; 1337 struct pac_tlv_hdr *hdr; 1338 1339 /* 1340 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1341 * supports both raw A-ID and one inside an A-ID TLV. 1342 */ 1343 a_id = buf; 1344 *id_len = len; 1345 if (len > sizeof(*hdr)) { 1346 int tlen; 1347 hdr = (struct pac_tlv_hdr *) buf; 1348 tlen = be_to_host16(hdr->len); 1349 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1350 sizeof(*hdr) + tlen <= len) { 1351 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1352 "(Start)"); 1353 a_id = (u8 *) (hdr + 1); 1354 *id_len = tlen; 1355 } 1356 } 1357 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1358 1359 return a_id; 1360 } 1361 1362 1363 static void eap_fast_select_pac(struct eap_fast_data *data, 1364 const u8 *a_id, size_t a_id_len) 1365 { 1366 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1367 PAC_TYPE_TUNNEL_PAC); 1368 if (data->current_pac == NULL) { 1369 /* 1370 * Tunnel PAC was not available for this A-ID. Try to use 1371 * Machine Authentication PAC, if one is available. 1372 */ 1373 data->current_pac = eap_fast_get_pac( 1374 data->pac, a_id, a_id_len, 1375 PAC_TYPE_MACHINE_AUTHENTICATION); 1376 } 1377 1378 if (data->current_pac) { 1379 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1380 "(PAC-Type %d)", data->current_pac->pac_type); 1381 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1382 data->current_pac->a_id_info, 1383 data->current_pac->a_id_info_len); 1384 } 1385 } 1386 1387 1388 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1389 struct eap_fast_data *data, 1390 struct eap_fast_pac *pac) 1391 { 1392 u8 *tlv; 1393 size_t tlv_len, olen; 1394 struct eap_tlv_hdr *ehdr; 1395 1396 olen = pac->pac_opaque_len; 1397 tlv_len = sizeof(*ehdr) + olen; 1398 tlv = os_malloc(tlv_len); 1399 if (tlv) { 1400 ehdr = (struct eap_tlv_hdr *) tlv; 1401 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1402 ehdr->length = host_to_be16(olen); 1403 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1404 } 1405 if (tlv == NULL || 1406 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1407 TLS_EXT_PAC_OPAQUE, 1408 tlv, tlv_len) < 0) { 1409 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1410 "extension"); 1411 os_free(tlv); 1412 return -1; 1413 } 1414 os_free(tlv); 1415 1416 return 0; 1417 } 1418 1419 1420 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1421 struct eap_fast_data *data) 1422 { 1423 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1424 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1425 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1426 "TLS extension"); 1427 return -1; 1428 } 1429 return 0; 1430 } 1431 1432 1433 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1434 struct eap_fast_data *data) 1435 { 1436 u8 ciphers[5]; 1437 int count = 0; 1438 1439 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1440 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1441 "provisioning TLS cipher suites"); 1442 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1443 } 1444 1445 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1446 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1447 "provisioning TLS cipher suites"); 1448 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1449 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1450 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1451 } 1452 1453 ciphers[count++] = TLS_CIPHER_NONE; 1454 1455 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1456 ciphers)) { 1457 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1458 "cipher suites for provisioning"); 1459 return -1; 1460 } 1461 1462 return 0; 1463 } 1464 1465 1466 static int eap_fast_process_start(struct eap_sm *sm, 1467 struct eap_fast_data *data, u8 flags, 1468 const u8 *pos, size_t left) 1469 { 1470 const u8 *a_id; 1471 size_t a_id_len; 1472 1473 /* EAP-FAST Version negotiation (section 3.1) */ 1474 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1475 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1476 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1477 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1478 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1479 data->fast_version); 1480 1481 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1482 eap_fast_select_pac(data, a_id, a_id_len); 1483 1484 if (data->resuming && data->current_pac) { 1485 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1486 "do not add PAC-Opaque to TLS ClientHello"); 1487 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1488 return -1; 1489 } else if (data->current_pac) { 1490 /* 1491 * PAC found for the A-ID and we are not resuming an old 1492 * session, so add PAC-Opaque extension to ClientHello. 1493 */ 1494 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1495 return -1; 1496 } else { 1497 /* No PAC found, so we must provision one. */ 1498 if (!data->provisioning_allowed) { 1499 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1500 "provisioning disabled"); 1501 return -1; 1502 } 1503 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1504 "starting provisioning"); 1505 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1506 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1507 return -1; 1508 data->provisioning = 1; 1509 } 1510 1511 return 0; 1512 } 1513 1514 1515 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1516 struct eap_method_ret *ret, 1517 const struct wpabuf *reqData) 1518 { 1519 const struct eap_hdr *req; 1520 size_t left; 1521 int res; 1522 u8 flags, id; 1523 struct wpabuf *resp; 1524 const u8 *pos; 1525 struct eap_fast_data *data = priv; 1526 1527 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1528 reqData, &left, &flags); 1529 if (pos == NULL) 1530 return NULL; 1531 1532 req = wpabuf_head(reqData); 1533 id = req->identifier; 1534 1535 if (flags & EAP_TLS_FLAGS_START) { 1536 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1537 return NULL; 1538 1539 left = 0; /* A-ID is not used in further packet processing */ 1540 } 1541 1542 resp = NULL; 1543 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1544 !data->resuming) { 1545 /* Process tunneled (encrypted) phase 2 data. */ 1546 struct wpabuf msg; 1547 wpabuf_set(&msg, pos, left); 1548 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp); 1549 if (res < 0) { 1550 ret->methodState = METHOD_DONE; 1551 ret->decision = DECISION_FAIL; 1552 /* 1553 * Ack possible Alert that may have caused failure in 1554 * decryption. 1555 */ 1556 res = 1; 1557 } 1558 } else { 1559 /* Continue processing TLS handshake (phase 1). */ 1560 res = eap_peer_tls_process_helper(sm, &data->ssl, 1561 EAP_TYPE_FAST, 1562 data->fast_version, id, pos, 1563 left, &resp); 1564 1565 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1566 char cipher[80]; 1567 wpa_printf(MSG_DEBUG, 1568 "EAP-FAST: TLS done, proceed to Phase 2"); 1569 if (data->provisioning && 1570 (!(data->provisioning_allowed & 1571 EAP_FAST_PROV_AUTH) || 1572 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1573 cipher, sizeof(cipher)) < 0 || 1574 os_strstr(cipher, "ADH-") || 1575 os_strstr(cipher, "anon"))) { 1576 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1577 "anonymous (unauthenticated) " 1578 "provisioning"); 1579 data->anon_provisioning = 1; 1580 } else 1581 data->anon_provisioning = 0; 1582 data->resuming = 0; 1583 eap_fast_derive_keys(sm, data); 1584 } 1585 1586 if (res == 2) { 1587 struct wpabuf msg; 1588 /* 1589 * Application data included in the handshake message. 1590 */ 1591 wpabuf_free(data->pending_phase2_req); 1592 data->pending_phase2_req = resp; 1593 resp = NULL; 1594 wpabuf_set(&msg, pos, left); 1595 res = eap_fast_decrypt(sm, data, ret, req, &msg, 1596 &resp); 1597 } 1598 } 1599 1600 if (res == 1) { 1601 wpabuf_free(resp); 1602 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1603 data->fast_version); 1604 } 1605 1606 return resp; 1607 } 1608 1609 1610 #if 0 /* FIX */ 1611 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1612 { 1613 struct eap_fast_data *data = priv; 1614 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1615 } 1616 1617 1618 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1619 { 1620 struct eap_fast_data *data = priv; 1621 os_free(data->key_block_p); 1622 data->key_block_p = NULL; 1623 wpabuf_free(data->pending_phase2_req); 1624 data->pending_phase2_req = NULL; 1625 } 1626 1627 1628 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1629 { 1630 struct eap_fast_data *data = priv; 1631 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1632 os_free(data); 1633 return NULL; 1634 } 1635 os_free(data->session_id); 1636 data->session_id = NULL; 1637 if (data->phase2_priv && data->phase2_method && 1638 data->phase2_method->init_for_reauth) 1639 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1640 data->phase2_success = 0; 1641 data->resuming = 1; 1642 data->provisioning = 0; 1643 data->anon_provisioning = 0; 1644 data->simck_idx = 0; 1645 return priv; 1646 } 1647 #endif 1648 1649 1650 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1651 size_t buflen, int verbose) 1652 { 1653 struct eap_fast_data *data = priv; 1654 int len, ret; 1655 1656 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1657 if (data->phase2_method) { 1658 ret = os_snprintf(buf + len, buflen - len, 1659 "EAP-FAST Phase2 method=%s\n", 1660 data->phase2_method->name); 1661 if (ret < 0 || (size_t) ret >= buflen - len) 1662 return len; 1663 len += ret; 1664 } 1665 return len; 1666 } 1667 1668 1669 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1670 { 1671 struct eap_fast_data *data = priv; 1672 return data->success; 1673 } 1674 1675 1676 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1677 { 1678 struct eap_fast_data *data = priv; 1679 u8 *key; 1680 1681 if (!data->success) 1682 return NULL; 1683 1684 key = os_malloc(EAP_FAST_KEY_LEN); 1685 if (key == NULL) 1686 return NULL; 1687 1688 *len = EAP_FAST_KEY_LEN; 1689 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN); 1690 1691 return key; 1692 } 1693 1694 1695 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1696 { 1697 struct eap_fast_data *data = priv; 1698 u8 *id; 1699 1700 if (!data->success) 1701 return NULL; 1702 1703 id = os_malloc(data->id_len); 1704 if (id == NULL) 1705 return NULL; 1706 1707 *len = data->id_len; 1708 os_memcpy(id, data->session_id, data->id_len); 1709 1710 return id; 1711 } 1712 1713 1714 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1715 { 1716 struct eap_fast_data *data = priv; 1717 u8 *key; 1718 1719 if (!data->success) 1720 return NULL; 1721 1722 key = os_malloc(EAP_EMSK_LEN); 1723 if (key == NULL) 1724 return NULL; 1725 1726 *len = EAP_EMSK_LEN; 1727 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1728 1729 return key; 1730 } 1731 1732 1733 int eap_peer_fast_register(void) 1734 { 1735 struct eap_method *eap; 1736 int ret; 1737 1738 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1739 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1740 if (eap == NULL) 1741 return -1; 1742 1743 eap->init = eap_fast_init; 1744 eap->deinit = eap_fast_deinit; 1745 eap->process = eap_fast_process; 1746 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1747 eap->getKey = eap_fast_getKey; 1748 eap->getSessionId = eap_fast_get_session_id; 1749 eap->get_status = eap_fast_get_status; 1750 #if 0 1751 eap->has_reauth_data = eap_fast_has_reauth_data; 1752 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1753 eap->init_for_reauth = eap_fast_init_for_reauth; 1754 #endif 1755 eap->get_emsk = eap_fast_get_emsk; 1756 1757 ret = eap_peer_method_register(eap); 1758 if (ret) 1759 eap_peer_method_free(eap); 1760 return ret; 1761 } 1762