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