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