eap_fast.c revision c5ec7f57ead87efa365800228aa0b09a12d9e6c4
1/* 2 * EAP peer method: EAP-FAST (RFC 4851) 3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "includes.h" 10 11#include "common.h" 12#include "crypto/tls.h" 13#include "crypto/sha1.h" 14#include "eap_common/eap_tlv_common.h" 15#include "eap_i.h" 16#include "eap_tls_common.h" 17#include "eap_config.h" 18#include "eap_fast_pac.h" 19 20#ifdef EAP_FAST_DYNAMIC 21#include "eap_fast_pac.c" 22#endif /* EAP_FAST_DYNAMIC */ 23 24/* TODO: 25 * - test session resumption and enable it if it interoperates 26 * - password change (pending mschapv2 packet; replay decrypted packet) 27 */ 28 29 30static void eap_fast_deinit(struct eap_sm *sm, void *priv); 31 32 33struct 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 emsk[EAP_EMSK_LEN]; 57 int success; 58 59 struct eap_fast_pac *pac; 60 struct eap_fast_pac *current_pac; 61 size_t max_pac_list_len; 62 int use_pac_binary_format; 63 64 u8 simck[EAP_FAST_SIMCK_LEN]; 65 int simck_idx; 66 67 struct wpabuf *pending_phase2_req; 68}; 69 70 71static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 72 const u8 *client_random, 73 const u8 *server_random, 74 u8 *master_secret) 75{ 76 struct eap_fast_data *data = ctx; 77 78 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 79 80 if (client_random == NULL || server_random == NULL || 81 master_secret == NULL) { 82 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall " 83 "back to full TLS handshake"); 84 data->session_ticket_used = 0; 85 if (data->provisioning_allowed) { 86 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a " 87 "new PAC-Key"); 88 data->provisioning = 1; 89 data->current_pac = NULL; 90 } 91 return 0; 92 } 93 94 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len); 95 96 if (data->current_pac == NULL) { 97 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for " 98 "using SessionTicket"); 99 data->session_ticket_used = 0; 100 return 0; 101 } 102 103 eap_fast_derive_master_secret(data->current_pac->pac_key, 104 server_random, client_random, 105 master_secret); 106 107 data->session_ticket_used = 1; 108 109 return 1; 110} 111 112 113static int eap_fast_parse_phase1(struct eap_fast_data *data, 114 const char *phase1) 115{ 116 const char *pos; 117 118 pos = os_strstr(phase1, "fast_provisioning="); 119 if (pos) { 120 data->provisioning_allowed = atoi(pos + 18); 121 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning " 122 "mode: %d", data->provisioning_allowed); 123 } 124 125 pos = os_strstr(phase1, "fast_max_pac_list_len="); 126 if (pos) { 127 data->max_pac_list_len = atoi(pos + 22); 128 if (data->max_pac_list_len == 0) 129 data->max_pac_list_len = 1; 130 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu", 131 (unsigned long) data->max_pac_list_len); 132 } 133 134 pos = os_strstr(phase1, "fast_pac_format=binary"); 135 if (pos) { 136 data->use_pac_binary_format = 1; 137 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC " 138 "list"); 139 } 140 141 return 0; 142} 143 144 145static void * eap_fast_init(struct eap_sm *sm) 146{ 147 struct eap_fast_data *data; 148 struct eap_peer_config *config = eap_get_config(sm); 149 150 data = os_zalloc(sizeof(*data)); 151 if (data == NULL) 152 return NULL; 153 data->fast_version = EAP_FAST_VERSION; 154 data->max_pac_list_len = 10; 155 156 if (config && config->phase1 && 157 eap_fast_parse_phase1(data, config->phase1) < 0) { 158 eap_fast_deinit(sm, data); 159 return NULL; 160 } 161 162 if (eap_peer_select_phase2_methods(config, "auth=", 163 &data->phase2_types, 164 &data->num_phase2_types) < 0) { 165 eap_fast_deinit(sm, data); 166 return NULL; 167 } 168 169 data->phase2_type.vendor = EAP_VENDOR_IETF; 170 data->phase2_type.method = EAP_TYPE_NONE; 171 172 if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) { 173 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 174 eap_fast_deinit(sm, data); 175 return NULL; 176 } 177 178 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 179 eap_fast_session_ticket_cb, 180 data) < 0) { 181 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 182 "callback"); 183 eap_fast_deinit(sm, data); 184 return NULL; 185 } 186 187 /* 188 * The local RADIUS server in a Cisco AP does not seem to like empty 189 * fragments before data, so disable that workaround for CBC. 190 * TODO: consider making this configurable 191 */ 192 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) { 193 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS " 194 "workarounds"); 195 } 196 197 if (data->use_pac_binary_format && 198 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) { 199 eap_fast_deinit(sm, data); 200 return NULL; 201 } 202 203 if (!data->use_pac_binary_format && 204 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) { 205 eap_fast_deinit(sm, data); 206 return NULL; 207 } 208 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 209 210 if (data->pac == NULL && !data->provisioning_allowed) { 211 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and " 212 "provisioning disabled"); 213 eap_fast_deinit(sm, data); 214 return NULL; 215 } 216 217 return data; 218} 219 220 221static void eap_fast_deinit(struct eap_sm *sm, void *priv) 222{ 223 struct eap_fast_data *data = priv; 224 struct eap_fast_pac *pac, *prev; 225 226 if (data == NULL) 227 return; 228 if (data->phase2_priv && data->phase2_method) 229 data->phase2_method->deinit(sm, data->phase2_priv); 230 os_free(data->phase2_types); 231 os_free(data->key_block_p); 232 eap_peer_tls_ssl_deinit(sm, &data->ssl); 233 234 pac = data->pac; 235 prev = NULL; 236 while (pac) { 237 prev = pac; 238 pac = pac->next; 239 eap_fast_free_pac(prev); 240 } 241 wpabuf_free(data->pending_phase2_req); 242 os_free(data); 243} 244 245 246static int eap_fast_derive_msk(struct eap_fast_data *data) 247{ 248 eap_fast_derive_eap_msk(data->simck, data->key_data); 249 eap_fast_derive_eap_emsk(data->simck, data->emsk); 250 data->success = 1; 251 return 0; 252} 253 254 255static void eap_fast_derive_key_auth(struct eap_sm *sm, 256 struct eap_fast_data *data) 257{ 258 u8 *sks; 259 260 /* RFC 4851, Section 5.1: 261 * Extra key material after TLS key_block: session_key_seed[40] 262 */ 263 264 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion", 265 EAP_FAST_SKS_LEN); 266 if (sks == NULL) { 267 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 268 "session_key_seed"); 269 return; 270 } 271 272 /* 273 * RFC 4851, Section 5.2: 274 * S-IMCK[0] = session_key_seed 275 */ 276 wpa_hexdump_key(MSG_DEBUG, 277 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 278 sks, EAP_FAST_SKS_LEN); 279 data->simck_idx = 0; 280 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 281 os_free(sks); 282} 283 284 285static void eap_fast_derive_key_provisioning(struct eap_sm *sm, 286 struct eap_fast_data *data) 287{ 288 os_free(data->key_block_p); 289 data->key_block_p = (struct eap_fast_key_block_provisioning *) 290 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 291 "key expansion", 292 sizeof(*data->key_block_p)); 293 if (data->key_block_p == NULL) { 294 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 295 return; 296 } 297 /* 298 * RFC 4851, Section 5.2: 299 * S-IMCK[0] = session_key_seed 300 */ 301 wpa_hexdump_key(MSG_DEBUG, 302 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 303 data->key_block_p->session_key_seed, 304 sizeof(data->key_block_p->session_key_seed)); 305 data->simck_idx = 0; 306 os_memcpy(data->simck, data->key_block_p->session_key_seed, 307 EAP_FAST_SIMCK_LEN); 308 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 309 data->key_block_p->server_challenge, 310 sizeof(data->key_block_p->server_challenge)); 311 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 312 data->key_block_p->client_challenge, 313 sizeof(data->key_block_p->client_challenge)); 314} 315 316 317static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 318{ 319 if (data->anon_provisioning) 320 eap_fast_derive_key_provisioning(sm, data); 321 else 322 eap_fast_derive_key_auth(sm, data); 323} 324 325 326static int eap_fast_init_phase2_method(struct eap_sm *sm, 327 struct eap_fast_data *data) 328{ 329 data->phase2_method = 330 eap_peer_get_eap_method(data->phase2_type.vendor, 331 data->phase2_type.method); 332 if (data->phase2_method == NULL) 333 return -1; 334 335 if (data->key_block_p) { 336 sm->auth_challenge = data->key_block_p->server_challenge; 337 sm->peer_challenge = data->key_block_p->client_challenge; 338 } 339 sm->init_phase2 = 1; 340 data->phase2_priv = data->phase2_method->init(sm); 341 sm->init_phase2 = 0; 342 sm->auth_challenge = NULL; 343 sm->peer_challenge = NULL; 344 345 return data->phase2_priv == NULL ? -1 : 0; 346} 347 348 349static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type) 350{ 351 size_t i; 352 353 /* TODO: TNC with anonymous provisioning; need to require both 354 * completed MSCHAPv2 and TNC */ 355 356 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) { 357 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 358 "during unauthenticated provisioning; reject phase2" 359 " type %d", type); 360 return -1; 361 } 362 363#ifdef EAP_TNC 364 if (type == EAP_TYPE_TNC) { 365 data->phase2_type.vendor = EAP_VENDOR_IETF; 366 data->phase2_type.method = EAP_TYPE_TNC; 367 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 368 "vendor %d method %d for TNC", 369 data->phase2_type.vendor, 370 data->phase2_type.method); 371 return 0; 372 } 373#endif /* EAP_TNC */ 374 375 for (i = 0; i < data->num_phase2_types; i++) { 376 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 377 data->phase2_types[i].method != type) 378 continue; 379 380 data->phase2_type.vendor = data->phase2_types[i].vendor; 381 data->phase2_type.method = data->phase2_types[i].method; 382 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 383 "vendor %d method %d", 384 data->phase2_type.vendor, 385 data->phase2_type.method); 386 break; 387 } 388 389 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 390 return -1; 391 392 return 0; 393} 394 395 396static int eap_fast_phase2_request(struct eap_sm *sm, 397 struct eap_fast_data *data, 398 struct eap_method_ret *ret, 399 struct eap_hdr *hdr, 400 struct wpabuf **resp) 401{ 402 size_t len = be_to_host16(hdr->length); 403 u8 *pos; 404 struct eap_method_ret iret; 405 struct eap_peer_config *config = eap_get_config(sm); 406 struct wpabuf msg; 407 408 if (len <= sizeof(struct eap_hdr)) { 409 wpa_printf(MSG_INFO, "EAP-FAST: too short " 410 "Phase 2 request (len=%lu)", (unsigned long) len); 411 return -1; 412 } 413 pos = (u8 *) (hdr + 1); 414 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 415 if (*pos == EAP_TYPE_IDENTITY) { 416 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 417 return 0; 418 } 419 420 if (data->phase2_priv && data->phase2_method && 421 *pos != data->phase2_type.method) { 422 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 423 "deinitialize previous method"); 424 data->phase2_method->deinit(sm, data->phase2_priv); 425 data->phase2_method = NULL; 426 data->phase2_priv = NULL; 427 data->phase2_type.vendor = EAP_VENDOR_IETF; 428 data->phase2_type.method = EAP_TYPE_NONE; 429 } 430 431 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 432 data->phase2_type.method == EAP_TYPE_NONE && 433 eap_fast_select_phase2_method(data, *pos) < 0) { 434 if (eap_peer_tls_phase2_nak(data->phase2_types, 435 data->num_phase2_types, 436 hdr, resp)) 437 return -1; 438 return 0; 439 } 440 441 if ((data->phase2_priv == NULL && 442 eap_fast_init_phase2_method(sm, data) < 0) || 443 data->phase2_method == NULL) { 444 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 445 "Phase 2 EAP method %d", *pos); 446 ret->methodState = METHOD_DONE; 447 ret->decision = DECISION_FAIL; 448 return -1; 449 } 450 451 os_memset(&iret, 0, sizeof(iret)); 452 wpabuf_set(&msg, hdr, len); 453 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 454 &msg); 455 if (*resp == NULL || 456 (iret.methodState == METHOD_DONE && 457 iret.decision == DECISION_FAIL)) { 458 ret->methodState = METHOD_DONE; 459 ret->decision = DECISION_FAIL; 460 } else if ((iret.methodState == METHOD_DONE || 461 iret.methodState == METHOD_MAY_CONT) && 462 (iret.decision == DECISION_UNCOND_SUCC || 463 iret.decision == DECISION_COND_SUCC)) { 464 data->phase2_success = 1; 465 } 466 467 if (*resp == NULL && config && 468 (config->pending_req_identity || config->pending_req_password || 469 config->pending_req_otp || config->pending_req_new_password)) { 470 wpabuf_free(data->pending_phase2_req); 471 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 472 } else if (*resp == NULL) 473 return -1; 474 475 return 0; 476} 477 478 479static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 480{ 481 struct wpabuf *buf; 482 struct eap_tlv_nak_tlv *nak; 483 buf = wpabuf_alloc(sizeof(*nak)); 484 if (buf == NULL) 485 return NULL; 486 nak = wpabuf_put(buf, sizeof(*nak)); 487 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 488 nak->length = host_to_be16(6); 489 nak->vendor_id = host_to_be32(vendor_id); 490 nak->nak_type = host_to_be16(tlv_type); 491 return buf; 492} 493 494 495static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 496{ 497 struct wpabuf *buf; 498 struct eap_tlv_intermediate_result_tlv *result; 499 buf = wpabuf_alloc(sizeof(*result)); 500 if (buf == NULL) 501 return NULL; 502 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 503 intermediate ? "Intermediate " : "", status); 504 result = wpabuf_put(buf, sizeof(*result)); 505 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 506 (intermediate ? 507 EAP_TLV_INTERMEDIATE_RESULT_TLV : 508 EAP_TLV_RESULT_TLV)); 509 result->length = host_to_be16(2); 510 result->status = host_to_be16(status); 511 return buf; 512} 513 514 515static struct wpabuf * eap_fast_tlv_pac_ack(void) 516{ 517 struct wpabuf *buf; 518 struct eap_tlv_result_tlv *res; 519 struct eap_tlv_pac_ack_tlv *ack; 520 521 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 522 if (buf == NULL) 523 return NULL; 524 525 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 526 ack = wpabuf_put(buf, sizeof(*ack)); 527 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 528 EAP_TLV_TYPE_MANDATORY); 529 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 530 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 531 ack->pac_len = host_to_be16(2); 532 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 533 534 return buf; 535} 536 537 538static struct wpabuf * eap_fast_process_eap_payload_tlv( 539 struct eap_sm *sm, struct eap_fast_data *data, 540 struct eap_method_ret *ret, 541 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 542{ 543 struct eap_hdr *hdr; 544 struct wpabuf *resp = NULL; 545 546 if (eap_payload_tlv_len < sizeof(*hdr)) { 547 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 548 "Payload TLV (len=%lu)", 549 (unsigned long) eap_payload_tlv_len); 550 return NULL; 551 } 552 553 hdr = (struct eap_hdr *) eap_payload_tlv; 554 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 555 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 556 "EAP Payload TLV"); 557 return NULL; 558 } 559 560 if (hdr->code != EAP_CODE_REQUEST) { 561 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 562 "Phase 2 EAP header", hdr->code); 563 return NULL; 564 } 565 566 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 567 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 568 "failed"); 569 return NULL; 570 } 571 572 return eap_fast_tlv_eap_payload(resp); 573} 574 575 576static int eap_fast_validate_crypto_binding( 577 struct eap_tlv_crypto_binding_tlv *_bind) 578{ 579 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 580 "Received Version %d SubType %d", 581 _bind->version, _bind->received_version, _bind->subtype); 582 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 583 _bind->nonce, sizeof(_bind->nonce)); 584 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 585 _bind->compound_mac, sizeof(_bind->compound_mac)); 586 587 if (_bind->version != EAP_FAST_VERSION || 588 _bind->received_version != EAP_FAST_VERSION || 589 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 590 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 591 "Crypto-Binding TLV: Version %d " 592 "Received Version %d SubType %d", 593 _bind->version, _bind->received_version, 594 _bind->subtype); 595 return -1; 596 } 597 598 return 0; 599} 600 601 602static void eap_fast_write_crypto_binding( 603 struct eap_tlv_crypto_binding_tlv *rbind, 604 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 605{ 606 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 607 EAP_TLV_CRYPTO_BINDING_TLV); 608 rbind->length = host_to_be16(sizeof(*rbind) - 609 sizeof(struct eap_tlv_hdr)); 610 rbind->version = EAP_FAST_VERSION; 611 rbind->received_version = _bind->version; 612 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 613 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 614 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 615 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 616 rbind->compound_mac); 617 618 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 619 "Received Version %d SubType %d", 620 rbind->version, rbind->received_version, rbind->subtype); 621 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 622 rbind->nonce, sizeof(rbind->nonce)); 623 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 624 rbind->compound_mac, sizeof(rbind->compound_mac)); 625} 626 627 628static int eap_fast_get_phase2_key(struct eap_sm *sm, 629 struct eap_fast_data *data, 630 u8 *isk, size_t isk_len) 631{ 632 u8 *key; 633 size_t key_len; 634 635 os_memset(isk, 0, isk_len); 636 637 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 638 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 639 "available"); 640 return -1; 641 } 642 643 if (data->phase2_method->isKeyAvailable == NULL || 644 data->phase2_method->getKey == NULL) 645 return 0; 646 647 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 648 (key = data->phase2_method->getKey(sm, data->phase2_priv, 649 &key_len)) == NULL) { 650 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 651 "from Phase 2"); 652 return -1; 653 } 654 655 if (key_len > isk_len) 656 key_len = isk_len; 657 if (key_len == 32 && 658 data->phase2_method->vendor == EAP_VENDOR_IETF && 659 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 660 /* 661 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 662 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 663 * ISK for EAP-FAST cryptobinding. 664 */ 665 os_memcpy(isk, key + 16, 16); 666 os_memcpy(isk + 16, key, 16); 667 } else 668 os_memcpy(isk, key, key_len); 669 os_free(key); 670 671 return 0; 672} 673 674 675static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 676 u8 *cmk) 677{ 678 u8 isk[32], imck[60]; 679 680 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 681 "calculation", data->simck_idx + 1); 682 683 /* 684 * RFC 4851, Section 5.2: 685 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 686 * MSK[j], 60) 687 * S-IMCK[j] = first 40 octets of IMCK[j] 688 * CMK[j] = last 20 octets of IMCK[j] 689 */ 690 691 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 692 return -1; 693 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 694 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 695 "Inner Methods Compound Keys", 696 isk, sizeof(isk), imck, sizeof(imck)); 697 data->simck_idx++; 698 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 699 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 700 data->simck, EAP_FAST_SIMCK_LEN); 701 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 702 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 703 cmk, EAP_FAST_CMK_LEN); 704 705 return 0; 706} 707 708 709static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 710{ 711 struct eap_tlv_hdr *pac; 712 struct eap_tlv_request_action_tlv *act; 713 struct eap_tlv_pac_type_tlv *type; 714 715 act = (struct eap_tlv_request_action_tlv *) pos; 716 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 717 act->length = host_to_be16(2); 718 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 719 720 pac = (struct eap_tlv_hdr *) (act + 1); 721 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 722 pac->length = host_to_be16(sizeof(*type)); 723 724 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 725 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 726 type->length = host_to_be16(2); 727 type->pac_type = host_to_be16(pac_type); 728 729 return (u8 *) (type + 1); 730} 731 732 733static struct wpabuf * eap_fast_process_crypto_binding( 734 struct eap_sm *sm, struct eap_fast_data *data, 735 struct eap_method_ret *ret, 736 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 737{ 738 struct wpabuf *resp; 739 u8 *pos; 740 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 741 int res; 742 size_t len; 743 744 if (eap_fast_validate_crypto_binding(_bind) < 0) 745 return NULL; 746 747 if (eap_fast_get_cmk(sm, data, cmk) < 0) 748 return NULL; 749 750 /* Validate received Compound MAC */ 751 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 752 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 753 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 754 "MAC calculation", (u8 *) _bind, bind_len); 755 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 756 _bind->compound_mac); 757 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac)); 758 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 759 cmac, sizeof(cmac)); 760 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 761 _bind->compound_mac, sizeof(cmac)); 762 if (res != 0) { 763 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 764 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 765 return NULL; 766 } 767 768 /* 769 * Compound MAC was valid, so authentication succeeded. Reply with 770 * crypto binding to allow server to complete authentication. 771 */ 772 773 len = sizeof(struct eap_tlv_crypto_binding_tlv); 774 resp = wpabuf_alloc(len); 775 if (resp == NULL) 776 return NULL; 777 778 if (!data->anon_provisioning && data->phase2_success && 779 eap_fast_derive_msk(data) < 0) { 780 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 781 ret->methodState = METHOD_DONE; 782 ret->decision = DECISION_FAIL; 783 data->phase2_success = 0; 784 wpabuf_free(resp); 785 return NULL; 786 } 787 788 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 789 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 790 pos, _bind, cmk); 791 792 return resp; 793} 794 795 796static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 797 u8 *pos, size_t len, int *pac_key_found) 798{ 799 switch (type & 0x7fff) { 800 case PAC_TYPE_PAC_KEY: 801 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 802 if (len != EAP_FAST_PAC_KEY_LEN) { 803 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 804 "length %lu", (unsigned long) len); 805 break; 806 } 807 *pac_key_found = 1; 808 os_memcpy(entry->pac_key, pos, len); 809 break; 810 case PAC_TYPE_PAC_OPAQUE: 811 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 812 entry->pac_opaque = pos; 813 entry->pac_opaque_len = len; 814 break; 815 case PAC_TYPE_PAC_INFO: 816 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 817 entry->pac_info = pos; 818 entry->pac_info_len = len; 819 break; 820 default: 821 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 822 type); 823 break; 824 } 825} 826 827 828static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 829 u8 *pac, size_t pac_len) 830{ 831 struct pac_tlv_hdr *hdr; 832 u8 *pos; 833 size_t left, len; 834 int type, pac_key_found = 0; 835 836 pos = pac; 837 left = pac_len; 838 839 while (left > sizeof(*hdr)) { 840 hdr = (struct pac_tlv_hdr *) pos; 841 type = be_to_host16(hdr->type); 842 len = be_to_host16(hdr->len); 843 pos += sizeof(*hdr); 844 left -= sizeof(*hdr); 845 if (len > left) { 846 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 847 "(type=%d len=%lu left=%lu)", 848 type, (unsigned long) len, 849 (unsigned long) left); 850 return -1; 851 } 852 853 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 854 855 pos += len; 856 left -= len; 857 } 858 859 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 860 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 861 "all the required fields"); 862 return -1; 863 } 864 865 return 0; 866} 867 868 869static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 870 u8 *pos, size_t len) 871{ 872 u16 pac_type; 873 u32 lifetime; 874 struct os_time now; 875 876 switch (type & 0x7fff) { 877 case PAC_TYPE_CRED_LIFETIME: 878 if (len != 4) { 879 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 880 "Invalid CRED_LIFETIME length - ignored", 881 pos, len); 882 return 0; 883 } 884 885 /* 886 * This is not currently saved separately in PAC files since 887 * the server can automatically initiate PAC update when 888 * needed. Anyway, the information is available from PAC-Info 889 * dump if it is needed for something in the future. 890 */ 891 lifetime = WPA_GET_BE32(pos); 892 os_get_time(&now); 893 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 894 "(%d days)", 895 lifetime, (lifetime - (u32) now.sec) / 86400); 896 break; 897 case PAC_TYPE_A_ID: 898 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 899 pos, len); 900 entry->a_id = pos; 901 entry->a_id_len = len; 902 break; 903 case PAC_TYPE_I_ID: 904 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 905 pos, len); 906 entry->i_id = pos; 907 entry->i_id_len = len; 908 break; 909 case PAC_TYPE_A_ID_INFO: 910 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 911 pos, len); 912 entry->a_id_info = pos; 913 entry->a_id_info_len = len; 914 break; 915 case PAC_TYPE_PAC_TYPE: 916 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 917 if (len != 2) { 918 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 919 "length %lu (expected 2)", 920 (unsigned long) len); 921 wpa_hexdump_ascii(MSG_DEBUG, 922 "EAP-FAST: PAC-Info - PAC-Type", 923 pos, len); 924 return -1; 925 } 926 pac_type = WPA_GET_BE16(pos); 927 if (pac_type != PAC_TYPE_TUNNEL_PAC && 928 pac_type != PAC_TYPE_USER_AUTHORIZATION && 929 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 930 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 931 "%d", pac_type); 932 return -1; 933 } 934 935 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 936 pac_type); 937 entry->pac_type = pac_type; 938 break; 939 default: 940 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 941 "type %d", type); 942 break; 943 } 944 945 return 0; 946} 947 948 949static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 950{ 951 struct pac_tlv_hdr *hdr; 952 u8 *pos; 953 size_t left, len; 954 int type; 955 956 /* RFC 5422, Section 4.2.4 */ 957 958 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 959 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 960 961 pos = entry->pac_info; 962 left = entry->pac_info_len; 963 while (left > sizeof(*hdr)) { 964 hdr = (struct pac_tlv_hdr *) pos; 965 type = be_to_host16(hdr->type); 966 len = be_to_host16(hdr->len); 967 pos += sizeof(*hdr); 968 left -= sizeof(*hdr); 969 if (len > left) { 970 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 971 "(type=%d len=%lu left=%lu)", 972 type, (unsigned long) len, 973 (unsigned long) left); 974 return -1; 975 } 976 977 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 978 return -1; 979 980 pos += len; 981 left -= len; 982 } 983 984 if (entry->a_id == NULL || entry->a_id_info == NULL) { 985 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 986 "all the required fields"); 987 return -1; 988 } 989 990 return 0; 991} 992 993 994static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 995 struct eap_fast_data *data, 996 struct eap_method_ret *ret, 997 u8 *pac, size_t pac_len) 998{ 999 struct eap_peer_config *config = eap_get_config(sm); 1000 struct eap_fast_pac entry; 1001 1002 os_memset(&entry, 0, sizeof(entry)); 1003 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1004 eap_fast_process_pac_info(&entry)) 1005 return NULL; 1006 1007 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1008 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1009 if (data->use_pac_binary_format) 1010 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1011 else 1012 eap_fast_save_pac(sm, data->pac, config->pac_file); 1013 1014 if (data->provisioning) { 1015 if (data->anon_provisioning) { 1016 /* 1017 * Unauthenticated provisioning does not provide keying 1018 * material and must end with an EAP-Failure. 1019 * Authentication will be done separately after this. 1020 */ 1021 data->success = 0; 1022 ret->decision = DECISION_FAIL; 1023 } else { 1024 /* 1025 * Server may or may not allow authenticated 1026 * provisioning also for key generation. 1027 */ 1028 ret->decision = DECISION_COND_SUCC; 1029 } 1030 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1031 "- Provisioning completed successfully"); 1032 } else { 1033 /* 1034 * This is PAC refreshing, i.e., normal authentication that is 1035 * expected to be completed with an EAP-Success. However, 1036 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1037 * after protected success exchange in case of EAP-Fast 1038 * provisioning, so we better use DECISION_COND_SUCC here 1039 * instead of DECISION_UNCOND_SUCC. 1040 */ 1041 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1042 "- PAC refreshing completed successfully"); 1043 ret->decision = DECISION_COND_SUCC; 1044 } 1045 ret->methodState = METHOD_DONE; 1046 return eap_fast_tlv_pac_ack(); 1047} 1048 1049 1050static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1051 struct eap_fast_tlv_parse *tlv, 1052 struct wpabuf **resp) 1053{ 1054 int mandatory, tlv_type, len, res; 1055 u8 *pos, *end; 1056 1057 os_memset(tlv, 0, sizeof(*tlv)); 1058 1059 /* Parse TLVs from the decrypted Phase 2 data */ 1060 pos = wpabuf_mhead(decrypted); 1061 end = pos + wpabuf_len(decrypted); 1062 while (pos + 4 < end) { 1063 mandatory = pos[0] & 0x80; 1064 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1065 pos += 2; 1066 len = WPA_GET_BE16(pos); 1067 pos += 2; 1068 if (pos + len > end) { 1069 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1070 return -1; 1071 } 1072 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1073 "TLV type %d length %d%s", 1074 tlv_type, len, mandatory ? " (mandatory)" : ""); 1075 1076 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1077 if (res == -2) 1078 break; 1079 if (res < 0) { 1080 if (mandatory) { 1081 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1082 "mandatory TLV type %d", tlv_type); 1083 *resp = eap_fast_tlv_nak(0, tlv_type); 1084 break; 1085 } else { 1086 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1087 "unknown optional TLV type %d", 1088 tlv_type); 1089 } 1090 } 1091 1092 pos += len; 1093 } 1094 1095 return 0; 1096} 1097 1098 1099static int eap_fast_encrypt_response(struct eap_sm *sm, 1100 struct eap_fast_data *data, 1101 struct wpabuf *resp, 1102 u8 identifier, struct wpabuf **out_data) 1103{ 1104 if (resp == NULL) 1105 return 0; 1106 1107 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1108 resp); 1109 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1110 data->fast_version, identifier, 1111 resp, out_data)) { 1112 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1113 "frame"); 1114 } 1115 wpabuf_free(resp); 1116 1117 return 0; 1118} 1119 1120 1121static struct wpabuf * eap_fast_pac_request(void) 1122{ 1123 struct wpabuf *tmp; 1124 u8 *pos, *pos2; 1125 1126 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1127 sizeof(struct eap_tlv_request_action_tlv) + 1128 sizeof(struct eap_tlv_pac_type_tlv)); 1129 if (tmp == NULL) 1130 return NULL; 1131 1132 pos = wpabuf_put(tmp, 0); 1133 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1134 wpabuf_put(tmp, pos2 - pos); 1135 return tmp; 1136} 1137 1138 1139static int eap_fast_process_decrypted(struct eap_sm *sm, 1140 struct eap_fast_data *data, 1141 struct eap_method_ret *ret, 1142 const struct eap_hdr *req, 1143 struct wpabuf *decrypted, 1144 struct wpabuf **out_data) 1145{ 1146 struct wpabuf *resp = NULL, *tmp; 1147 struct eap_fast_tlv_parse tlv; 1148 int failed = 0; 1149 1150 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1151 return 0; 1152 if (resp) 1153 return eap_fast_encrypt_response(sm, data, resp, 1154 req->identifier, out_data); 1155 1156 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1157 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1158 return eap_fast_encrypt_response(sm, data, resp, 1159 req->identifier, out_data); 1160 } 1161 1162 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1163 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1164 return eap_fast_encrypt_response(sm, data, resp, 1165 req->identifier, out_data); 1166 } 1167 1168 if (tlv.crypto_binding) { 1169 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1170 tlv.crypto_binding, 1171 tlv.crypto_binding_len); 1172 if (tmp == NULL) 1173 failed = 1; 1174 else 1175 resp = wpabuf_concat(resp, tmp); 1176 } 1177 1178 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1179 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1180 EAP_TLV_RESULT_SUCCESS, 1); 1181 resp = wpabuf_concat(resp, tmp); 1182 } 1183 1184 if (tlv.eap_payload_tlv) { 1185 tmp = eap_fast_process_eap_payload_tlv( 1186 sm, data, ret, tlv.eap_payload_tlv, 1187 tlv.eap_payload_tlv_len); 1188 resp = wpabuf_concat(resp, tmp); 1189 } 1190 1191 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1192 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1193 "acknowledging success"); 1194 failed = 1; 1195 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1196 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1197 tlv.pac_len); 1198 resp = wpabuf_concat(resp, tmp); 1199 } 1200 1201 if (data->current_pac == NULL && data->provisioning && 1202 !data->anon_provisioning && !tlv.pac && 1203 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1204 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1205 /* 1206 * Need to request Tunnel PAC when using authenticated 1207 * provisioning. 1208 */ 1209 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1210 tmp = eap_fast_pac_request(); 1211 resp = wpabuf_concat(resp, tmp); 1212 } 1213 1214 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1215 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1216 resp = wpabuf_concat(tmp, resp); 1217 } else if (failed) { 1218 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1219 resp = wpabuf_concat(tmp, resp); 1220 } 1221 1222 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1223 tlv.crypto_binding && data->phase2_success) { 1224 if (data->anon_provisioning) { 1225 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1226 "provisioning completed successfully."); 1227 ret->methodState = METHOD_DONE; 1228 ret->decision = DECISION_FAIL; 1229 } else { 1230 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1231 "completed successfully."); 1232 if (data->provisioning) 1233 ret->methodState = METHOD_MAY_CONT; 1234 else 1235 ret->methodState = METHOD_DONE; 1236 ret->decision = DECISION_UNCOND_SUCC; 1237 } 1238 } 1239 1240 if (resp == NULL) { 1241 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1242 "empty response packet"); 1243 resp = wpabuf_alloc(1); 1244 } 1245 1246 return eap_fast_encrypt_response(sm, data, resp, req->identifier, 1247 out_data); 1248} 1249 1250 1251static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1252 struct eap_method_ret *ret, 1253 const struct eap_hdr *req, 1254 const struct wpabuf *in_data, 1255 struct wpabuf **out_data) 1256{ 1257 struct wpabuf *in_decrypted; 1258 int res; 1259 1260 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1261 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1262 1263 if (data->pending_phase2_req) { 1264 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1265 "skip decryption and use old data"); 1266 /* Clear TLS reassembly state. */ 1267 eap_peer_tls_reset_input(&data->ssl); 1268 1269 in_decrypted = data->pending_phase2_req; 1270 data->pending_phase2_req = NULL; 1271 goto continue_req; 1272 } 1273 1274 if (wpabuf_len(in_data) == 0) { 1275 /* Received TLS ACK - requesting more fragments */ 1276 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1277 data->fast_version, 1278 req->identifier, NULL, out_data); 1279 } 1280 1281 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1282 if (res) 1283 return res; 1284 1285continue_req: 1286 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1287 in_decrypted); 1288 1289 if (wpabuf_len(in_decrypted) < 4) { 1290 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1291 "TLV frame (len=%lu)", 1292 (unsigned long) wpabuf_len(in_decrypted)); 1293 wpabuf_free(in_decrypted); 1294 return -1; 1295 } 1296 1297 res = eap_fast_process_decrypted(sm, data, ret, req, 1298 in_decrypted, out_data); 1299 1300 wpabuf_free(in_decrypted); 1301 1302 return res; 1303} 1304 1305 1306static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1307{ 1308 const u8 *a_id; 1309 struct pac_tlv_hdr *hdr; 1310 1311 /* 1312 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1313 * supports both raw A-ID and one inside an A-ID TLV. 1314 */ 1315 a_id = buf; 1316 *id_len = len; 1317 if (len > sizeof(*hdr)) { 1318 int tlen; 1319 hdr = (struct pac_tlv_hdr *) buf; 1320 tlen = be_to_host16(hdr->len); 1321 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1322 sizeof(*hdr) + tlen <= len) { 1323 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1324 "(Start)"); 1325 a_id = (u8 *) (hdr + 1); 1326 *id_len = tlen; 1327 } 1328 } 1329 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1330 1331 return a_id; 1332} 1333 1334 1335static void eap_fast_select_pac(struct eap_fast_data *data, 1336 const u8 *a_id, size_t a_id_len) 1337{ 1338 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1339 PAC_TYPE_TUNNEL_PAC); 1340 if (data->current_pac == NULL) { 1341 /* 1342 * Tunnel PAC was not available for this A-ID. Try to use 1343 * Machine Authentication PAC, if one is available. 1344 */ 1345 data->current_pac = eap_fast_get_pac( 1346 data->pac, a_id, a_id_len, 1347 PAC_TYPE_MACHINE_AUTHENTICATION); 1348 } 1349 1350 if (data->current_pac) { 1351 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1352 "(PAC-Type %d)", data->current_pac->pac_type); 1353 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1354 data->current_pac->a_id_info, 1355 data->current_pac->a_id_info_len); 1356 } 1357} 1358 1359 1360static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1361 struct eap_fast_data *data, 1362 struct eap_fast_pac *pac) 1363{ 1364 u8 *tlv; 1365 size_t tlv_len, olen; 1366 struct eap_tlv_hdr *ehdr; 1367 1368 olen = pac->pac_opaque_len; 1369 tlv_len = sizeof(*ehdr) + olen; 1370 tlv = os_malloc(tlv_len); 1371 if (tlv) { 1372 ehdr = (struct eap_tlv_hdr *) tlv; 1373 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1374 ehdr->length = host_to_be16(olen); 1375 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1376 } 1377 if (tlv == NULL || 1378 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1379 TLS_EXT_PAC_OPAQUE, 1380 tlv, tlv_len) < 0) { 1381 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1382 "extension"); 1383 os_free(tlv); 1384 return -1; 1385 } 1386 os_free(tlv); 1387 1388 return 0; 1389} 1390 1391 1392static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1393 struct eap_fast_data *data) 1394{ 1395 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1396 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1397 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1398 "TLS extension"); 1399 return -1; 1400 } 1401 return 0; 1402} 1403 1404 1405static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1406 struct eap_fast_data *data) 1407{ 1408 u8 ciphers[5]; 1409 int count = 0; 1410 1411 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1412 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1413 "provisioning TLS cipher suites"); 1414 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1415 } 1416 1417 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1418 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1419 "provisioning TLS cipher suites"); 1420 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1421 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1422 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1423 } 1424 1425 ciphers[count++] = TLS_CIPHER_NONE; 1426 1427 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1428 ciphers)) { 1429 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1430 "cipher suites for provisioning"); 1431 return -1; 1432 } 1433 1434 return 0; 1435} 1436 1437 1438static int eap_fast_process_start(struct eap_sm *sm, 1439 struct eap_fast_data *data, u8 flags, 1440 const u8 *pos, size_t left) 1441{ 1442 const u8 *a_id; 1443 size_t a_id_len; 1444 1445 /* EAP-FAST Version negotiation (section 3.1) */ 1446 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1447 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1448 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1449 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1450 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1451 data->fast_version); 1452 1453 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1454 eap_fast_select_pac(data, a_id, a_id_len); 1455 1456 if (data->resuming && data->current_pac) { 1457 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1458 "do not add PAC-Opaque to TLS ClientHello"); 1459 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1460 return -1; 1461 } else if (data->current_pac) { 1462 /* 1463 * PAC found for the A-ID and we are not resuming an old 1464 * session, so add PAC-Opaque extension to ClientHello. 1465 */ 1466 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1467 return -1; 1468 } else { 1469 /* No PAC found, so we must provision one. */ 1470 if (!data->provisioning_allowed) { 1471 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1472 "provisioning disabled"); 1473 return -1; 1474 } 1475 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1476 "starting provisioning"); 1477 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1478 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1479 return -1; 1480 data->provisioning = 1; 1481 } 1482 1483 return 0; 1484} 1485 1486 1487static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1488 struct eap_method_ret *ret, 1489 const struct wpabuf *reqData) 1490{ 1491 const struct eap_hdr *req; 1492 size_t left; 1493 int res; 1494 u8 flags, id; 1495 struct wpabuf *resp; 1496 const u8 *pos; 1497 struct eap_fast_data *data = priv; 1498 1499 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1500 reqData, &left, &flags); 1501 if (pos == NULL) 1502 return NULL; 1503 1504 req = wpabuf_head(reqData); 1505 id = req->identifier; 1506 1507 if (flags & EAP_TLS_FLAGS_START) { 1508 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1509 return NULL; 1510 1511 left = 0; /* A-ID is not used in further packet processing */ 1512 } 1513 1514 resp = NULL; 1515 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1516 !data->resuming) { 1517 /* Process tunneled (encrypted) phase 2 data. */ 1518 struct wpabuf msg; 1519 wpabuf_set(&msg, pos, left); 1520 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp); 1521 if (res < 0) { 1522 ret->methodState = METHOD_DONE; 1523 ret->decision = DECISION_FAIL; 1524 /* 1525 * Ack possible Alert that may have caused failure in 1526 * decryption. 1527 */ 1528 res = 1; 1529 } 1530 } else { 1531 /* Continue processing TLS handshake (phase 1). */ 1532 res = eap_peer_tls_process_helper(sm, &data->ssl, 1533 EAP_TYPE_FAST, 1534 data->fast_version, id, pos, 1535 left, &resp); 1536 1537 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1538 char cipher[80]; 1539 wpa_printf(MSG_DEBUG, 1540 "EAP-FAST: TLS done, proceed to Phase 2"); 1541 if (data->provisioning && 1542 (!(data->provisioning_allowed & 1543 EAP_FAST_PROV_AUTH) || 1544 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1545 cipher, sizeof(cipher)) < 0 || 1546 os_strstr(cipher, "ADH-") || 1547 os_strstr(cipher, "anon"))) { 1548 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1549 "anonymous (unauthenticated) " 1550 "provisioning"); 1551 data->anon_provisioning = 1; 1552 } else 1553 data->anon_provisioning = 0; 1554 data->resuming = 0; 1555 eap_fast_derive_keys(sm, data); 1556 } 1557 1558 if (res == 2) { 1559 struct wpabuf msg; 1560 /* 1561 * Application data included in the handshake message. 1562 */ 1563 wpabuf_free(data->pending_phase2_req); 1564 data->pending_phase2_req = resp; 1565 resp = NULL; 1566 wpabuf_set(&msg, pos, left); 1567 res = eap_fast_decrypt(sm, data, ret, req, &msg, 1568 &resp); 1569 } 1570 } 1571 1572 if (res == 1) { 1573 wpabuf_free(resp); 1574 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1575 data->fast_version); 1576 } 1577 1578 return resp; 1579} 1580 1581 1582#if 0 /* FIX */ 1583static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1584{ 1585 struct eap_fast_data *data = priv; 1586 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1587} 1588 1589 1590static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1591{ 1592 struct eap_fast_data *data = priv; 1593 os_free(data->key_block_p); 1594 data->key_block_p = NULL; 1595 wpabuf_free(data->pending_phase2_req); 1596 data->pending_phase2_req = NULL; 1597} 1598 1599 1600static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1601{ 1602 struct eap_fast_data *data = priv; 1603 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1604 os_free(data); 1605 return NULL; 1606 } 1607 if (data->phase2_priv && data->phase2_method && 1608 data->phase2_method->init_for_reauth) 1609 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1610 data->phase2_success = 0; 1611 data->resuming = 1; 1612 data->provisioning = 0; 1613 data->anon_provisioning = 0; 1614 data->simck_idx = 0; 1615 return priv; 1616} 1617#endif 1618 1619 1620static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1621 size_t buflen, int verbose) 1622{ 1623 struct eap_fast_data *data = priv; 1624 int len, ret; 1625 1626 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1627 if (data->phase2_method) { 1628 ret = os_snprintf(buf + len, buflen - len, 1629 "EAP-FAST Phase2 method=%s\n", 1630 data->phase2_method->name); 1631 if (ret < 0 || (size_t) ret >= buflen - len) 1632 return len; 1633 len += ret; 1634 } 1635 return len; 1636} 1637 1638 1639static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1640{ 1641 struct eap_fast_data *data = priv; 1642 return data->success; 1643} 1644 1645 1646static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1647{ 1648 struct eap_fast_data *data = priv; 1649 u8 *key; 1650 1651 if (!data->success) 1652 return NULL; 1653 1654 key = os_malloc(EAP_FAST_KEY_LEN); 1655 if (key == NULL) 1656 return NULL; 1657 1658 *len = EAP_FAST_KEY_LEN; 1659 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN); 1660 1661 return key; 1662} 1663 1664 1665static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1666{ 1667 struct eap_fast_data *data = priv; 1668 u8 *key; 1669 1670 if (!data->success) 1671 return NULL; 1672 1673 key = os_malloc(EAP_EMSK_LEN); 1674 if (key == NULL) 1675 return NULL; 1676 1677 *len = EAP_EMSK_LEN; 1678 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1679 1680 return key; 1681} 1682 1683 1684int eap_peer_fast_register(void) 1685{ 1686 struct eap_method *eap; 1687 int ret; 1688 1689 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1690 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1691 if (eap == NULL) 1692 return -1; 1693 1694 eap->init = eap_fast_init; 1695 eap->deinit = eap_fast_deinit; 1696 eap->process = eap_fast_process; 1697 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1698 eap->getKey = eap_fast_getKey; 1699 eap->get_status = eap_fast_get_status; 1700#if 0 1701 eap->has_reauth_data = eap_fast_has_reauth_data; 1702 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1703 eap->init_for_reauth = eap_fast_init_for_reauth; 1704#endif 1705 eap->get_emsk = eap_fast_get_emsk; 1706 1707 ret = eap_peer_method_register(eap); 1708 if (ret) 1709 eap_peer_method_free(eap); 1710 return ret; 1711} 1712