1 /* 2 * EAP peer method: EAP-TTLS (RFC 5281) 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 "crypto/ms_funcs.h" 19 #include "crypto/sha1.h" 20 #include "crypto/tls.h" 21 #include "eap_common/chap.h" 22 #include "eap_common/eap_ttls.h" 23 #include "mschapv2.h" 24 #include "eap_i.h" 25 #include "eap_tls_common.h" 26 #include "eap_config.h" 27 28 29 /* Maximum supported TTLS version 30 * 0 = RFC 5281 31 * 1 = draft-funk-eap-ttls-v1-00.txt 32 */ 33 #ifndef EAP_TTLS_VERSION 34 #define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */ 35 #endif /* EAP_TTLS_VERSION */ 36 37 38 #define MSCHAPV2_KEY_LEN 16 39 #define MSCHAPV2_NT_RESPONSE_LEN 24 40 41 42 static void eap_ttls_deinit(struct eap_sm *sm, void *priv); 43 44 45 struct eap_ttls_data { 46 struct eap_ssl_data ssl; 47 int ssl_initialized; 48 49 int ttls_version, force_ttls_version; 50 51 const struct eap_method *phase2_method; 52 void *phase2_priv; 53 int phase2_success; 54 int phase2_start; 55 56 enum phase2_types { 57 EAP_TTLS_PHASE2_EAP, 58 EAP_TTLS_PHASE2_MSCHAPV2, 59 EAP_TTLS_PHASE2_MSCHAP, 60 EAP_TTLS_PHASE2_PAP, 61 EAP_TTLS_PHASE2_CHAP 62 } phase2_type; 63 struct eap_method_type phase2_eap_type; 64 struct eap_method_type *phase2_eap_types; 65 size_t num_phase2_eap_types; 66 67 u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN]; 68 int auth_response_valid; 69 u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */ 70 u8 ident; 71 int resuming; /* starting a resumed session */ 72 int reauth; /* reauthentication */ 73 u8 *key_data; 74 75 struct wpabuf *pending_phase2_req; 76 77 #ifdef EAP_TNC 78 int ready_for_tnc; 79 int tnc_started; 80 #endif /* EAP_TNC */ 81 }; 82 83 84 static void * eap_ttls_init(struct eap_sm *sm) 85 { 86 struct eap_ttls_data *data; 87 struct eap_peer_config *config = eap_get_config(sm); 88 char *selected; 89 90 data = os_zalloc(sizeof(*data)); 91 if (data == NULL) 92 return NULL; 93 data->ttls_version = EAP_TTLS_VERSION; 94 data->force_ttls_version = -1; 95 selected = "EAP"; 96 data->phase2_type = EAP_TTLS_PHASE2_EAP; 97 98 #if EAP_TTLS_VERSION > 0 99 if (config && config->phase1) { 100 const char *pos = os_strstr(config->phase1, "ttlsver="); 101 if (pos) { 102 data->force_ttls_version = atoi(pos + 8); 103 data->ttls_version = data->force_ttls_version; 104 wpa_printf(MSG_DEBUG, "EAP-TTLS: Forced TTLS version " 105 "%d", data->force_ttls_version); 106 } 107 } 108 #endif /* EAP_TTLS_VERSION */ 109 110 if (config && config->phase2) { 111 if (os_strstr(config->phase2, "autheap=")) { 112 selected = "EAP"; 113 data->phase2_type = EAP_TTLS_PHASE2_EAP; 114 } else if (os_strstr(config->phase2, "auth=MSCHAPV2")) { 115 selected = "MSCHAPV2"; 116 data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2; 117 } else if (os_strstr(config->phase2, "auth=MSCHAP")) { 118 selected = "MSCHAP"; 119 data->phase2_type = EAP_TTLS_PHASE2_MSCHAP; 120 } else if (os_strstr(config->phase2, "auth=PAP")) { 121 selected = "PAP"; 122 data->phase2_type = EAP_TTLS_PHASE2_PAP; 123 } else if (os_strstr(config->phase2, "auth=CHAP")) { 124 selected = "CHAP"; 125 data->phase2_type = EAP_TTLS_PHASE2_CHAP; 126 } 127 } 128 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected); 129 130 if (data->phase2_type == EAP_TTLS_PHASE2_EAP) { 131 if (eap_peer_select_phase2_methods(config, "autheap=", 132 &data->phase2_eap_types, 133 &data->num_phase2_eap_types) 134 < 0) { 135 eap_ttls_deinit(sm, data); 136 return NULL; 137 } 138 139 data->phase2_eap_type.vendor = EAP_VENDOR_IETF; 140 data->phase2_eap_type.method = EAP_TYPE_NONE; 141 } 142 143 #if EAP_TTLS_VERSION > 0 144 if (!(tls_capabilities(sm->ssl_ctx) & TLS_CAPABILITY_IA) && 145 data->ttls_version > 0) { 146 if (data->force_ttls_version > 0) { 147 wpa_printf(MSG_INFO, "EAP-TTLS: Forced TTLSv%d and " 148 "TLS library does not support TLS/IA.", 149 data->force_ttls_version); 150 eap_ttls_deinit(sm, data); 151 return NULL; 152 } 153 data->ttls_version = 0; 154 } 155 #endif /* EAP_TTLS_VERSION */ 156 157 return data; 158 } 159 160 161 static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm, 162 struct eap_ttls_data *data) 163 { 164 if (data->phase2_priv && data->phase2_method) { 165 data->phase2_method->deinit(sm, data->phase2_priv); 166 data->phase2_method = NULL; 167 data->phase2_priv = NULL; 168 } 169 } 170 171 172 static void eap_ttls_deinit(struct eap_sm *sm, void *priv) 173 { 174 struct eap_ttls_data *data = priv; 175 if (data == NULL) 176 return; 177 eap_ttls_phase2_eap_deinit(sm, data); 178 os_free(data->phase2_eap_types); 179 if (data->ssl_initialized) 180 eap_peer_tls_ssl_deinit(sm, &data->ssl); 181 os_free(data->key_data); 182 wpabuf_free(data->pending_phase2_req); 183 os_free(data); 184 } 185 186 187 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id, 188 int mandatory, size_t len) 189 { 190 struct ttls_avp_vendor *avp; 191 u8 flags; 192 size_t hdrlen; 193 194 avp = (struct ttls_avp_vendor *) avphdr; 195 flags = mandatory ? AVP_FLAGS_MANDATORY : 0; 196 if (vendor_id) { 197 flags |= AVP_FLAGS_VENDOR; 198 hdrlen = sizeof(*avp); 199 avp->vendor_id = host_to_be32(vendor_id); 200 } else { 201 hdrlen = sizeof(struct ttls_avp); 202 } 203 204 avp->avp_code = host_to_be32(avp_code); 205 avp->avp_length = host_to_be32((flags << 24) | (u32) (hdrlen + len)); 206 207 return avphdr + hdrlen; 208 } 209 210 211 static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code, 212 u32 vendor_id, int mandatory, 213 const u8 *data, size_t len) 214 { 215 u8 *pos; 216 pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len); 217 os_memcpy(pos, data, len); 218 pos += len; 219 AVP_PAD(start, pos); 220 return pos; 221 } 222 223 224 static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code, 225 int mandatory) 226 { 227 struct wpabuf *msg; 228 u8 *avp, *pos; 229 230 msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4); 231 if (msg == NULL) { 232 wpabuf_free(*resp); 233 *resp = NULL; 234 return -1; 235 } 236 237 avp = wpabuf_mhead(msg); 238 pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp)); 239 os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp)); 240 pos += wpabuf_len(*resp); 241 AVP_PAD(avp, pos); 242 wpabuf_free(*resp); 243 wpabuf_put(msg, pos - avp); 244 *resp = msg; 245 return 0; 246 } 247 248 249 #if EAP_TTLS_VERSION > 0 250 static int eap_ttls_ia_permute_inner_secret(struct eap_sm *sm, 251 struct eap_ttls_data *data, 252 const u8 *key, size_t key_len) 253 { 254 u8 *buf; 255 size_t buf_len; 256 int ret; 257 258 if (key) { 259 buf_len = 2 + key_len; 260 buf = os_malloc(buf_len); 261 if (buf == NULL) 262 return -1; 263 WPA_PUT_BE16(buf, key_len); 264 os_memcpy(buf + 2, key, key_len); 265 } else { 266 buf = NULL; 267 buf_len = 0; 268 } 269 270 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Session keys for TLS/IA inner " 271 "secret permutation", buf, buf_len); 272 ret = tls_connection_ia_permute_inner_secret(sm->ssl_ctx, 273 data->ssl.conn, 274 buf, buf_len); 275 os_free(buf); 276 277 return ret; 278 } 279 #endif /* EAP_TTLS_VERSION */ 280 281 282 static int eap_ttls_v0_derive_key(struct eap_sm *sm, 283 struct eap_ttls_data *data) 284 { 285 os_free(data->key_data); 286 data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, 287 "ttls keying material", 288 EAP_TLS_KEY_LEN); 289 if (!data->key_data) { 290 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key"); 291 return -1; 292 } 293 294 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key", 295 data->key_data, EAP_TLS_KEY_LEN); 296 297 return 0; 298 } 299 300 301 #if EAP_TTLS_VERSION > 0 302 static int eap_ttls_v1_derive_key(struct eap_sm *sm, 303 struct eap_ttls_data *data) 304 { 305 struct tls_keys keys; 306 u8 *rnd; 307 308 os_free(data->key_data); 309 data->key_data = NULL; 310 311 os_memset(&keys, 0, sizeof(keys)); 312 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) || 313 keys.client_random == NULL || keys.server_random == NULL || 314 keys.inner_secret == NULL) { 315 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, " 316 "client random, or server random to derive keying " 317 "material"); 318 return -1; 319 } 320 321 rnd = os_malloc(keys.client_random_len + keys.server_random_len); 322 data->key_data = os_malloc(EAP_TLS_KEY_LEN); 323 if (rnd == NULL || data->key_data == NULL) { 324 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for key derivation"); 325 os_free(rnd); 326 os_free(data->key_data); 327 data->key_data = NULL; 328 return -1; 329 } 330 os_memcpy(rnd, keys.client_random, keys.client_random_len); 331 os_memcpy(rnd + keys.client_random_len, keys.server_random, 332 keys.server_random_len); 333 334 if (tls_prf(keys.inner_secret, keys.inner_secret_len, 335 "ttls v1 keying material", rnd, keys.client_random_len + 336 keys.server_random_len, data->key_data, EAP_TLS_KEY_LEN)) { 337 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key"); 338 os_free(rnd); 339 os_free(data->key_data); 340 data->key_data = NULL; 341 return -1; 342 } 343 344 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: client/server random", 345 rnd, keys.client_random_len + keys.server_random_len); 346 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: TLS/IA inner secret", 347 keys.inner_secret, keys.inner_secret_len); 348 349 os_free(rnd); 350 351 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key", 352 data->key_data, EAP_TLS_KEY_LEN); 353 354 return 0; 355 } 356 #endif /* EAP_TTLS_VERSION */ 357 358 359 static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm, 360 struct eap_ttls_data *data, size_t len) 361 { 362 #if EAP_TTLS_VERSION > 0 363 struct tls_keys keys; 364 u8 *challenge, *rnd; 365 #endif /* EAP_TTLS_VERSION */ 366 367 if (data->ttls_version == 0) { 368 return eap_peer_tls_derive_key(sm, &data->ssl, 369 "ttls challenge", len); 370 } 371 372 #if EAP_TTLS_VERSION > 0 373 374 os_memset(&keys, 0, sizeof(keys)); 375 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) || 376 keys.client_random == NULL || keys.server_random == NULL || 377 keys.inner_secret == NULL) { 378 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, " 379 "client random, or server random to derive " 380 "implicit challenge"); 381 return NULL; 382 } 383 384 rnd = os_malloc(keys.client_random_len + keys.server_random_len); 385 challenge = os_malloc(len); 386 if (rnd == NULL || challenge == NULL) { 387 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for implicit " 388 "challenge derivation"); 389 os_free(rnd); 390 os_free(challenge); 391 return NULL; 392 } 393 os_memcpy(rnd, keys.server_random, keys.server_random_len); 394 os_memcpy(rnd + keys.server_random_len, keys.client_random, 395 keys.client_random_len); 396 397 if (tls_prf(keys.inner_secret, keys.inner_secret_len, 398 "inner application challenge", rnd, 399 keys.client_random_len + keys.server_random_len, 400 challenge, len)) { 401 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive implicit " 402 "challenge"); 403 os_free(rnd); 404 os_free(challenge); 405 return NULL; 406 } 407 408 os_free(rnd); 409 410 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived implicit challenge", 411 challenge, len); 412 413 return challenge; 414 415 #else /* EAP_TTLS_VERSION */ 416 417 return NULL; 418 419 #endif /* EAP_TTLS_VERSION */ 420 } 421 422 423 static void eap_ttlsv1_phase2_eap_finish(struct eap_sm *sm, 424 struct eap_ttls_data *data, 425 struct eap_method_ret *ret) 426 { 427 #if EAP_TTLS_VERSION > 0 428 if (data->ttls_version > 0) { 429 const struct eap_method *m = data->phase2_method; 430 void *priv = data->phase2_priv; 431 432 /* TTLSv1 requires TLS/IA FinalPhaseFinished */ 433 if (ret->decision == DECISION_UNCOND_SUCC) 434 ret->decision = DECISION_COND_SUCC; 435 ret->methodState = METHOD_CONT; 436 437 if (ret->decision == DECISION_COND_SUCC && 438 m->isKeyAvailable && m->getKey && 439 m->isKeyAvailable(sm, priv)) { 440 u8 *key; 441 size_t key_len; 442 key = m->getKey(sm, priv, &key_len); 443 if (key) { 444 eap_ttls_ia_permute_inner_secret( 445 sm, data, key, key_len); 446 os_free(key); 447 } 448 } 449 } 450 #endif /* EAP_TTLS_VERSION */ 451 } 452 453 454 static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data, 455 u8 method) 456 { 457 size_t i; 458 for (i = 0; i < data->num_phase2_eap_types; i++) { 459 if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF || 460 data->phase2_eap_types[i].method != method) 461 continue; 462 463 data->phase2_eap_type.vendor = 464 data->phase2_eap_types[i].vendor; 465 data->phase2_eap_type.method = 466 data->phase2_eap_types[i].method; 467 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected " 468 "Phase 2 EAP vendor %d method %d", 469 data->phase2_eap_type.vendor, 470 data->phase2_eap_type.method); 471 break; 472 } 473 } 474 475 476 static int eap_ttls_phase2_eap_process(struct eap_sm *sm, 477 struct eap_ttls_data *data, 478 struct eap_method_ret *ret, 479 struct eap_hdr *hdr, size_t len, 480 struct wpabuf **resp) 481 { 482 struct wpabuf msg; 483 struct eap_method_ret iret; 484 485 os_memset(&iret, 0, sizeof(iret)); 486 wpabuf_set(&msg, hdr, len); 487 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 488 &msg); 489 if ((iret.methodState == METHOD_DONE || 490 iret.methodState == METHOD_MAY_CONT) && 491 (iret.decision == DECISION_UNCOND_SUCC || 492 iret.decision == DECISION_COND_SUCC || 493 iret.decision == DECISION_FAIL)) { 494 ret->methodState = iret.methodState; 495 ret->decision = iret.decision; 496 } 497 eap_ttlsv1_phase2_eap_finish(sm, data, ret); 498 499 return 0; 500 } 501 502 503 static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm, 504 struct eap_ttls_data *data, 505 struct eap_method_ret *ret, 506 struct eap_hdr *hdr, size_t len, 507 u8 method, struct wpabuf **resp) 508 { 509 #ifdef EAP_TNC 510 if (data->tnc_started && data->phase2_method && 511 data->phase2_priv && method == EAP_TYPE_TNC && 512 data->phase2_eap_type.method == EAP_TYPE_TNC) 513 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, 514 resp); 515 516 if (data->ready_for_tnc && !data->tnc_started && 517 method == EAP_TYPE_TNC) { 518 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed " 519 "EAP method"); 520 data->tnc_started = 1; 521 } 522 523 if (data->tnc_started) { 524 if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF || 525 data->phase2_eap_type.method == EAP_TYPE_TNC) { 526 wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP " 527 "type %d for TNC", method); 528 return -1; 529 } 530 531 data->phase2_eap_type.vendor = EAP_VENDOR_IETF; 532 data->phase2_eap_type.method = method; 533 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected " 534 "Phase 2 EAP vendor %d method %d (TNC)", 535 data->phase2_eap_type.vendor, 536 data->phase2_eap_type.method); 537 538 if (data->phase2_type == EAP_TTLS_PHASE2_EAP) 539 eap_ttls_phase2_eap_deinit(sm, data); 540 } 541 #endif /* EAP_TNC */ 542 543 if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF && 544 data->phase2_eap_type.method == EAP_TYPE_NONE) 545 eap_ttls_phase2_select_eap_method(data, method); 546 547 if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE) 548 { 549 if (eap_peer_tls_phase2_nak(data->phase2_eap_types, 550 data->num_phase2_eap_types, 551 hdr, resp)) 552 return -1; 553 return 0; 554 } 555 556 if (data->phase2_priv == NULL) { 557 data->phase2_method = eap_peer_get_eap_method( 558 EAP_VENDOR_IETF, method); 559 if (data->phase2_method) { 560 sm->init_phase2 = 1; 561 data->phase2_priv = data->phase2_method->init(sm); 562 sm->init_phase2 = 0; 563 } 564 } 565 if (data->phase2_priv == NULL || data->phase2_method == NULL) { 566 wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize " 567 "Phase 2 EAP method %d", method); 568 return -1; 569 } 570 571 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp); 572 } 573 574 575 static int eap_ttls_phase2_request_eap(struct eap_sm *sm, 576 struct eap_ttls_data *data, 577 struct eap_method_ret *ret, 578 struct eap_hdr *hdr, 579 struct wpabuf **resp) 580 { 581 size_t len = be_to_host16(hdr->length); 582 u8 *pos; 583 struct eap_peer_config *config = eap_get_config(sm); 584 585 if (len <= sizeof(struct eap_hdr)) { 586 wpa_printf(MSG_INFO, "EAP-TTLS: too short " 587 "Phase 2 request (len=%lu)", (unsigned long) len); 588 return -1; 589 } 590 pos = (u8 *) (hdr + 1); 591 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos); 592 switch (*pos) { 593 case EAP_TYPE_IDENTITY: 594 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 595 break; 596 default: 597 if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len, 598 *pos, resp) < 0) 599 return -1; 600 break; 601 } 602 603 if (*resp == NULL && 604 (config->pending_req_identity || config->pending_req_password || 605 config->pending_req_otp)) { 606 return 0; 607 } 608 609 if (*resp == NULL) 610 return -1; 611 612 wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response", 613 *resp); 614 return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1); 615 } 616 617 618 static void eap_ttlsv1_permute_inner(struct eap_sm *sm, 619 struct eap_ttls_data *data) 620 { 621 #if EAP_TTLS_VERSION > 0 622 u8 session_key[2 * MSCHAPV2_KEY_LEN]; 623 624 if (data->ttls_version == 0) 625 return; 626 627 get_asymetric_start_key(data->master_key, session_key, 628 MSCHAPV2_KEY_LEN, 0, 0); 629 get_asymetric_start_key(data->master_key, 630 session_key + MSCHAPV2_KEY_LEN, 631 MSCHAPV2_KEY_LEN, 1, 0); 632 eap_ttls_ia_permute_inner_secret(sm, data, session_key, 633 sizeof(session_key)); 634 #endif /* EAP_TTLS_VERSION */ 635 } 636 637 638 static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm, 639 struct eap_ttls_data *data, 640 struct eap_method_ret *ret, 641 struct wpabuf **resp) 642 { 643 struct wpabuf *msg; 644 u8 *buf, *pos, *challenge, *peer_challenge; 645 const u8 *identity, *password; 646 size_t identity_len, password_len; 647 int pwhash; 648 649 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request"); 650 651 identity = eap_get_config_identity(sm, &identity_len); 652 password = eap_get_config_password2(sm, &password_len, &pwhash); 653 if (identity == NULL || password == NULL) 654 return -1; 655 656 msg = wpabuf_alloc(identity_len + 1000); 657 if (msg == NULL) { 658 wpa_printf(MSG_ERROR, 659 "EAP-TTLS/MSCHAPV2: Failed to allocate memory"); 660 return -1; 661 } 662 pos = buf = wpabuf_mhead(msg); 663 664 /* User-Name */ 665 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, 666 identity, identity_len); 667 668 /* MS-CHAP-Challenge */ 669 challenge = eap_ttls_implicit_challenge( 670 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1); 671 if (challenge == NULL) { 672 wpabuf_free(msg); 673 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive " 674 "implicit challenge"); 675 return -1; 676 } 677 peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN; 678 679 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, 680 RADIUS_VENDOR_ID_MICROSOFT, 1, 681 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); 682 683 /* MS-CHAP2-Response */ 684 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE, 685 RADIUS_VENDOR_ID_MICROSOFT, 1, 686 EAP_TTLS_MSCHAPV2_RESPONSE_LEN); 687 data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN]; 688 *pos++ = data->ident; 689 *pos++ = 0; /* Flags */ 690 os_memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); 691 pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN; 692 os_memset(pos, 0, 8); /* Reserved, must be zero */ 693 pos += 8; 694 if (mschapv2_derive_response(identity, identity_len, password, 695 password_len, pwhash, challenge, 696 peer_challenge, pos, data->auth_response, 697 data->master_key)) { 698 wpabuf_free(msg); 699 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive " 700 "response"); 701 return -1; 702 } 703 data->auth_response_valid = 1; 704 705 eap_ttlsv1_permute_inner(sm, data); 706 707 pos += 24; 708 os_free(challenge); 709 AVP_PAD(buf, pos); 710 711 wpabuf_put(msg, pos - buf); 712 *resp = msg; 713 714 if (sm->workaround && data->ttls_version == 0) { 715 /* At least FreeRADIUS seems to be terminating 716 * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success 717 * packet. */ 718 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - " 719 "allow success without tunneled response"); 720 ret->methodState = METHOD_MAY_CONT; 721 ret->decision = DECISION_COND_SUCC; 722 } 723 724 return 0; 725 } 726 727 728 static int eap_ttls_phase2_request_mschap(struct eap_sm *sm, 729 struct eap_ttls_data *data, 730 struct eap_method_ret *ret, 731 struct wpabuf **resp) 732 { 733 struct wpabuf *msg; 734 u8 *buf, *pos, *challenge; 735 const u8 *identity, *password; 736 size_t identity_len, password_len; 737 int pwhash; 738 739 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request"); 740 741 identity = eap_get_config_identity(sm, &identity_len); 742 password = eap_get_config_password2(sm, &password_len, &pwhash); 743 if (identity == NULL || password == NULL) 744 return -1; 745 746 msg = wpabuf_alloc(identity_len + 1000); 747 if (msg == NULL) { 748 wpa_printf(MSG_ERROR, 749 "EAP-TTLS/MSCHAP: Failed to allocate memory"); 750 return -1; 751 } 752 pos = buf = wpabuf_mhead(msg); 753 754 /* User-Name */ 755 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, 756 identity, identity_len); 757 758 /* MS-CHAP-Challenge */ 759 challenge = eap_ttls_implicit_challenge( 760 sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1); 761 if (challenge == NULL) { 762 wpabuf_free(msg); 763 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive " 764 "implicit challenge"); 765 return -1; 766 } 767 768 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, 769 RADIUS_VENDOR_ID_MICROSOFT, 1, 770 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); 771 772 /* MS-CHAP-Response */ 773 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE, 774 RADIUS_VENDOR_ID_MICROSOFT, 1, 775 EAP_TTLS_MSCHAP_RESPONSE_LEN); 776 data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN]; 777 *pos++ = data->ident; 778 *pos++ = 1; /* Flags: Use NT style passwords */ 779 os_memset(pos, 0, 24); /* LM-Response */ 780 pos += 24; 781 if (pwhash) { 782 challenge_response(challenge, password, pos); /* NT-Response */ 783 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash", 784 password, 16); 785 } else { 786 nt_challenge_response(challenge, password, password_len, 787 pos); /* NT-Response */ 788 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password", 789 password, password_len); 790 } 791 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge", 792 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); 793 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24); 794 pos += 24; 795 os_free(challenge); 796 AVP_PAD(buf, pos); 797 798 wpabuf_put(msg, pos - buf); 799 *resp = msg; 800 801 if (data->ttls_version > 0) { 802 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success, 803 * so do not allow connection to be terminated yet. */ 804 ret->methodState = METHOD_CONT; 805 ret->decision = DECISION_COND_SUCC; 806 } else { 807 /* EAP-TTLS/MSCHAP does not provide tunneled success 808 * notification, so assume that Phase2 succeeds. */ 809 ret->methodState = METHOD_DONE; 810 ret->decision = DECISION_COND_SUCC; 811 } 812 813 return 0; 814 } 815 816 817 static int eap_ttls_phase2_request_pap(struct eap_sm *sm, 818 struct eap_ttls_data *data, 819 struct eap_method_ret *ret, 820 struct wpabuf **resp) 821 { 822 struct wpabuf *msg; 823 u8 *buf, *pos; 824 size_t pad; 825 const u8 *identity, *password; 826 size_t identity_len, password_len; 827 828 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request"); 829 830 identity = eap_get_config_identity(sm, &identity_len); 831 password = eap_get_config_password(sm, &password_len); 832 if (identity == NULL || password == NULL) 833 return -1; 834 835 msg = wpabuf_alloc(identity_len + password_len + 100); 836 if (msg == NULL) { 837 wpa_printf(MSG_ERROR, 838 "EAP-TTLS/PAP: Failed to allocate memory"); 839 return -1; 840 } 841 pos = buf = wpabuf_mhead(msg); 842 843 /* User-Name */ 844 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, 845 identity, identity_len); 846 847 /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts 848 * the data, so no separate encryption is used in the AVP itself. 849 * However, the password is padded to obfuscate its length. */ 850 pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15; 851 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1, 852 password_len + pad); 853 os_memcpy(pos, password, password_len); 854 pos += password_len; 855 os_memset(pos, 0, pad); 856 pos += pad; 857 AVP_PAD(buf, pos); 858 859 wpabuf_put(msg, pos - buf); 860 *resp = msg; 861 862 if (data->ttls_version > 0) { 863 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success, 864 * so do not allow connection to be terminated yet. */ 865 ret->methodState = METHOD_CONT; 866 ret->decision = DECISION_COND_SUCC; 867 } else { 868 /* EAP-TTLS/PAP does not provide tunneled success notification, 869 * so assume that Phase2 succeeds. */ 870 ret->methodState = METHOD_DONE; 871 ret->decision = DECISION_COND_SUCC; 872 } 873 874 return 0; 875 } 876 877 878 static int eap_ttls_phase2_request_chap(struct eap_sm *sm, 879 struct eap_ttls_data *data, 880 struct eap_method_ret *ret, 881 struct wpabuf **resp) 882 { 883 struct wpabuf *msg; 884 u8 *buf, *pos, *challenge; 885 const u8 *identity, *password; 886 size_t identity_len, password_len; 887 888 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request"); 889 890 identity = eap_get_config_identity(sm, &identity_len); 891 password = eap_get_config_password(sm, &password_len); 892 if (identity == NULL || password == NULL) 893 return -1; 894 895 msg = wpabuf_alloc(identity_len + 1000); 896 if (msg == NULL) { 897 wpa_printf(MSG_ERROR, 898 "EAP-TTLS/CHAP: Failed to allocate memory"); 899 return -1; 900 } 901 pos = buf = wpabuf_mhead(msg); 902 903 /* User-Name */ 904 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, 905 identity, identity_len); 906 907 /* CHAP-Challenge */ 908 challenge = eap_ttls_implicit_challenge( 909 sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1); 910 if (challenge == NULL) { 911 wpabuf_free(msg); 912 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive " 913 "implicit challenge"); 914 return -1; 915 } 916 917 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1, 918 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); 919 920 /* CHAP-Password */ 921 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1, 922 1 + EAP_TTLS_CHAP_PASSWORD_LEN); 923 data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN]; 924 *pos++ = data->ident; 925 926 /* MD5(Ident + Password + Challenge) */ 927 chap_md5(data->ident, password, password_len, challenge, 928 EAP_TTLS_CHAP_CHALLENGE_LEN, pos); 929 930 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username", 931 identity, identity_len); 932 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password", 933 password, password_len); 934 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge", 935 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); 936 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password", 937 pos, EAP_TTLS_CHAP_PASSWORD_LEN); 938 pos += EAP_TTLS_CHAP_PASSWORD_LEN; 939 os_free(challenge); 940 AVP_PAD(buf, pos); 941 942 wpabuf_put(msg, pos - buf); 943 *resp = msg; 944 945 if (data->ttls_version > 0) { 946 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success, 947 * so do not allow connection to be terminated yet. */ 948 ret->methodState = METHOD_CONT; 949 ret->decision = DECISION_COND_SUCC; 950 } else { 951 /* EAP-TTLS/CHAP does not provide tunneled success 952 * notification, so assume that Phase2 succeeds. */ 953 ret->methodState = METHOD_DONE; 954 ret->decision = DECISION_COND_SUCC; 955 } 956 957 return 0; 958 } 959 960 961 static int eap_ttls_phase2_request(struct eap_sm *sm, 962 struct eap_ttls_data *data, 963 struct eap_method_ret *ret, 964 struct eap_hdr *hdr, 965 struct wpabuf **resp) 966 { 967 int res = 0; 968 size_t len; 969 enum phase2_types phase2_type = data->phase2_type; 970 971 #ifdef EAP_TNC 972 if (data->tnc_started) { 973 wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC"); 974 phase2_type = EAP_TTLS_PHASE2_EAP; 975 } 976 #endif /* EAP_TNC */ 977 978 if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 || 979 phase2_type == EAP_TTLS_PHASE2_MSCHAP || 980 phase2_type == EAP_TTLS_PHASE2_PAP || 981 phase2_type == EAP_TTLS_PHASE2_CHAP) { 982 if (eap_get_config_identity(sm, &len) == NULL) { 983 wpa_printf(MSG_INFO, 984 "EAP-TTLS: Identity not configured"); 985 eap_sm_request_identity(sm); 986 if (eap_get_config_password(sm, &len) == NULL) 987 eap_sm_request_password(sm); 988 return 0; 989 } 990 991 if (eap_get_config_password(sm, &len) == NULL) { 992 wpa_printf(MSG_INFO, 993 "EAP-TTLS: Password not configured"); 994 eap_sm_request_password(sm); 995 return 0; 996 } 997 } 998 999 switch (phase2_type) { 1000 case EAP_TTLS_PHASE2_EAP: 1001 res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp); 1002 break; 1003 case EAP_TTLS_PHASE2_MSCHAPV2: 1004 res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp); 1005 break; 1006 case EAP_TTLS_PHASE2_MSCHAP: 1007 res = eap_ttls_phase2_request_mschap(sm, data, ret, resp); 1008 break; 1009 case EAP_TTLS_PHASE2_PAP: 1010 res = eap_ttls_phase2_request_pap(sm, data, ret, resp); 1011 break; 1012 case EAP_TTLS_PHASE2_CHAP: 1013 res = eap_ttls_phase2_request_chap(sm, data, ret, resp); 1014 break; 1015 default: 1016 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown"); 1017 res = -1; 1018 break; 1019 } 1020 1021 if (res < 0) { 1022 ret->methodState = METHOD_DONE; 1023 ret->decision = DECISION_FAIL; 1024 } 1025 1026 return res; 1027 } 1028 1029 1030 #if EAP_TTLS_VERSION > 0 1031 static struct wpabuf * eap_ttls_build_phase_finished( 1032 struct eap_sm *sm, struct eap_ttls_data *data, int id, int final) 1033 { 1034 struct wpabuf *req, *buf; 1035 1036 buf = tls_connection_ia_send_phase_finished(sm->ssl_ctx, 1037 data->ssl.conn, 1038 final); 1039 if (buf == NULL) 1040 return NULL; 1041 1042 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1043 1 + wpabuf_len(buf), 1044 EAP_CODE_RESPONSE, id); 1045 if (req == NULL) { 1046 wpabuf_free(buf); 1047 return NULL; 1048 } 1049 1050 wpabuf_put_u8(req, data->ttls_version); 1051 wpabuf_put_buf(req, buf); 1052 wpabuf_free(buf); 1053 eap_update_len(req); 1054 1055 return req; 1056 } 1057 #endif /* EAP_TTLS_VERSION */ 1058 1059 1060 struct ttls_parse_avp { 1061 u8 *mschapv2; 1062 u8 *eapdata; 1063 size_t eap_len; 1064 int mschapv2_error; 1065 }; 1066 1067 1068 static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen, 1069 struct ttls_parse_avp *parse) 1070 { 1071 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message"); 1072 if (parse->eapdata == NULL) { 1073 parse->eapdata = os_malloc(dlen); 1074 if (parse->eapdata == NULL) { 1075 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate " 1076 "memory for Phase 2 EAP data"); 1077 return -1; 1078 } 1079 os_memcpy(parse->eapdata, dpos, dlen); 1080 parse->eap_len = dlen; 1081 } else { 1082 u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen); 1083 if (neweap == NULL) { 1084 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate " 1085 "memory for Phase 2 EAP data"); 1086 return -1; 1087 } 1088 os_memcpy(neweap + parse->eap_len, dpos, dlen); 1089 parse->eapdata = neweap; 1090 parse->eap_len += dlen; 1091 } 1092 1093 return 0; 1094 } 1095 1096 1097 static int eap_ttls_parse_avp(u8 *pos, size_t left, 1098 struct ttls_parse_avp *parse) 1099 { 1100 struct ttls_avp *avp; 1101 u32 avp_code, avp_length, vendor_id = 0; 1102 u8 avp_flags, *dpos; 1103 size_t dlen; 1104 1105 avp = (struct ttls_avp *) pos; 1106 avp_code = be_to_host32(avp->avp_code); 1107 avp_length = be_to_host32(avp->avp_length); 1108 avp_flags = (avp_length >> 24) & 0xff; 1109 avp_length &= 0xffffff; 1110 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x " 1111 "length=%d", (int) avp_code, avp_flags, 1112 (int) avp_length); 1113 1114 if (avp_length > left) { 1115 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow " 1116 "(len=%d, left=%lu) - dropped", 1117 (int) avp_length, (unsigned long) left); 1118 return -1; 1119 } 1120 1121 if (avp_length < sizeof(*avp)) { 1122 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d", 1123 avp_length); 1124 return -1; 1125 } 1126 1127 dpos = (u8 *) (avp + 1); 1128 dlen = avp_length - sizeof(*avp); 1129 if (avp_flags & AVP_FLAGS_VENDOR) { 1130 if (dlen < 4) { 1131 wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP " 1132 "underflow"); 1133 return -1; 1134 } 1135 vendor_id = WPA_GET_BE32(dpos); 1136 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d", 1137 (int) vendor_id); 1138 dpos += 4; 1139 dlen -= 4; 1140 } 1141 1142 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen); 1143 1144 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) { 1145 if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0) 1146 return -1; 1147 } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) { 1148 /* This is an optional message that can be displayed to 1149 * the user. */ 1150 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message", 1151 dpos, dlen); 1152 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && 1153 avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) { 1154 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success", 1155 dpos, dlen); 1156 if (dlen != 43) { 1157 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected " 1158 "MS-CHAP2-Success length " 1159 "(len=%lu, expected 43)", 1160 (unsigned long) dlen); 1161 return -1; 1162 } 1163 parse->mschapv2 = dpos; 1164 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && 1165 avp_code == RADIUS_ATTR_MS_CHAP_ERROR) { 1166 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error", 1167 dpos, dlen); 1168 parse->mschapv2_error = 1; 1169 } else if (avp_flags & AVP_FLAGS_MANDATORY) { 1170 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP " 1171 "code %d vendor_id %d - dropped", 1172 (int) avp_code, (int) vendor_id); 1173 return -1; 1174 } else { 1175 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP " 1176 "code %d vendor_id %d", 1177 (int) avp_code, (int) vendor_id); 1178 } 1179 1180 return avp_length; 1181 } 1182 1183 1184 static int eap_ttls_parse_avps(struct wpabuf *in_decrypted, 1185 struct ttls_parse_avp *parse) 1186 { 1187 u8 *pos; 1188 size_t left, pad; 1189 int avp_length; 1190 1191 pos = wpabuf_mhead(in_decrypted); 1192 left = wpabuf_len(in_decrypted); 1193 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left); 1194 if (left < sizeof(struct ttls_avp)) { 1195 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame" 1196 " len=%lu expected %lu or more - dropped", 1197 (unsigned long) left, 1198 (unsigned long) sizeof(struct ttls_avp)); 1199 return -1; 1200 } 1201 1202 /* Parse AVPs */ 1203 os_memset(parse, 0, sizeof(*parse)); 1204 1205 while (left > 0) { 1206 avp_length = eap_ttls_parse_avp(pos, left, parse); 1207 if (avp_length < 0) 1208 return -1; 1209 1210 pad = (4 - (avp_length & 3)) & 3; 1211 pos += avp_length + pad; 1212 if (left < avp_length + pad) 1213 left = 0; 1214 else 1215 left -= avp_length + pad; 1216 } 1217 1218 return 0; 1219 } 1220 1221 1222 static u8 * eap_ttls_fake_identity_request(void) 1223 { 1224 struct eap_hdr *hdr; 1225 u8 *buf; 1226 1227 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of " 1228 "Phase 2 - use fake EAP-Request Identity"); 1229 buf = os_malloc(sizeof(*hdr) + 1); 1230 if (buf == NULL) { 1231 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate " 1232 "memory for fake EAP-Identity Request"); 1233 return NULL; 1234 } 1235 1236 hdr = (struct eap_hdr *) buf; 1237 hdr->code = EAP_CODE_REQUEST; 1238 hdr->identifier = 0; 1239 hdr->length = host_to_be16(sizeof(*hdr) + 1); 1240 buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY; 1241 1242 return buf; 1243 } 1244 1245 1246 static int eap_ttls_encrypt_response(struct eap_sm *sm, 1247 struct eap_ttls_data *data, 1248 struct wpabuf *resp, u8 identifier, 1249 struct wpabuf **out_data) 1250 { 1251 if (resp == NULL) 1252 return 0; 1253 1254 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data", 1255 resp); 1256 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS, 1257 data->ttls_version, identifier, 1258 resp, out_data)) { 1259 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 " 1260 "frame"); 1261 return -1; 1262 } 1263 wpabuf_free(resp); 1264 1265 return 0; 1266 } 1267 1268 1269 static int eap_ttls_process_phase2_eap(struct eap_sm *sm, 1270 struct eap_ttls_data *data, 1271 struct eap_method_ret *ret, 1272 struct ttls_parse_avp *parse, 1273 struct wpabuf **resp) 1274 { 1275 struct eap_hdr *hdr; 1276 size_t len; 1277 1278 if (parse->eapdata == NULL) { 1279 wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the " 1280 "packet - dropped"); 1281 return -1; 1282 } 1283 1284 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP", 1285 parse->eapdata, parse->eap_len); 1286 hdr = (struct eap_hdr *) parse->eapdata; 1287 1288 if (parse->eap_len < sizeof(*hdr)) { 1289 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP " 1290 "frame (len=%lu, expected %lu or more) - dropped", 1291 (unsigned long) parse->eap_len, 1292 (unsigned long) sizeof(*hdr)); 1293 return -1; 1294 } 1295 len = be_to_host16(hdr->length); 1296 if (len > parse->eap_len) { 1297 wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 " 1298 "EAP frame (EAP hdr len=%lu, EAP data len in " 1299 "AVP=%lu)", 1300 (unsigned long) len, 1301 (unsigned long) parse->eap_len); 1302 return -1; 1303 } 1304 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d " 1305 "identifier=%d length=%lu", 1306 hdr->code, hdr->identifier, (unsigned long) len); 1307 switch (hdr->code) { 1308 case EAP_CODE_REQUEST: 1309 if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) { 1310 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request " 1311 "processing failed"); 1312 return -1; 1313 } 1314 break; 1315 default: 1316 wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in " 1317 "Phase 2 EAP header", hdr->code); 1318 return -1; 1319 } 1320 1321 return 0; 1322 } 1323 1324 1325 static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm, 1326 struct eap_ttls_data *data, 1327 struct eap_method_ret *ret, 1328 struct ttls_parse_avp *parse) 1329 { 1330 if (parse->mschapv2_error) { 1331 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received " 1332 "MS-CHAP-Error - failed"); 1333 ret->methodState = METHOD_DONE; 1334 ret->decision = DECISION_FAIL; 1335 /* Reply with empty data to ACK error */ 1336 return 1; 1337 } 1338 1339 if (parse->mschapv2 == NULL) { 1340 #ifdef EAP_TNC 1341 if (data->phase2_success && parse->eapdata) { 1342 /* 1343 * Allow EAP-TNC to be started after successfully 1344 * completed MSCHAPV2. 1345 */ 1346 return 1; 1347 } 1348 #endif /* EAP_TNC */ 1349 wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP " 1350 "received for Phase2 MSCHAPV2"); 1351 return -1; 1352 } 1353 if (parse->mschapv2[0] != data->ident) { 1354 wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 " 1355 "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)", 1356 parse->mschapv2[0], data->ident); 1357 return -1; 1358 } 1359 if (!data->auth_response_valid || 1360 mschapv2_verify_auth_response(data->auth_response, 1361 parse->mschapv2 + 1, 42)) { 1362 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator " 1363 "response in Phase 2 MSCHAPV2 success request"); 1364 return -1; 1365 } 1366 1367 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 " 1368 "authentication succeeded"); 1369 if (data->ttls_version > 0) { 1370 /* 1371 * EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report 1372 * success, so do not allow connection to be terminated 1373 * yet. 1374 */ 1375 ret->methodState = METHOD_CONT; 1376 ret->decision = DECISION_COND_SUCC; 1377 } else { 1378 ret->methodState = METHOD_DONE; 1379 ret->decision = DECISION_UNCOND_SUCC; 1380 data->phase2_success = 1; 1381 } 1382 1383 /* 1384 * Reply with empty data; authentication server will reply 1385 * with EAP-Success after this. 1386 */ 1387 return 1; 1388 } 1389 1390 1391 #ifdef EAP_TNC 1392 static int eap_ttls_process_tnc_start(struct eap_sm *sm, 1393 struct eap_ttls_data *data, 1394 struct eap_method_ret *ret, 1395 struct ttls_parse_avp *parse, 1396 struct wpabuf **resp) 1397 { 1398 /* TNC uses inner EAP method after non-EAP TTLS phase 2. */ 1399 if (parse->eapdata == NULL) { 1400 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received " 1401 "unexpected tunneled data (no EAP)"); 1402 return -1; 1403 } 1404 1405 if (!data->ready_for_tnc) { 1406 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received " 1407 "EAP after non-EAP, but not ready for TNC"); 1408 return -1; 1409 } 1410 1411 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed " 1412 "non-EAP method"); 1413 data->tnc_started = 1; 1414 1415 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0) 1416 return -1; 1417 1418 return 0; 1419 } 1420 #endif /* EAP_TNC */ 1421 1422 1423 static int eap_ttls_process_decrypted(struct eap_sm *sm, 1424 struct eap_ttls_data *data, 1425 struct eap_method_ret *ret, 1426 u8 identifier, 1427 struct ttls_parse_avp *parse, 1428 struct wpabuf *in_decrypted, 1429 struct wpabuf **out_data) 1430 { 1431 struct wpabuf *resp = NULL; 1432 struct eap_peer_config *config = eap_get_config(sm); 1433 int res; 1434 enum phase2_types phase2_type = data->phase2_type; 1435 1436 #ifdef EAP_TNC 1437 if (data->tnc_started) 1438 phase2_type = EAP_TTLS_PHASE2_EAP; 1439 #endif /* EAP_TNC */ 1440 1441 switch (phase2_type) { 1442 case EAP_TTLS_PHASE2_EAP: 1443 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) < 1444 0) 1445 return -1; 1446 break; 1447 case EAP_TTLS_PHASE2_MSCHAPV2: 1448 res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse); 1449 #ifdef EAP_TNC 1450 if (res == 1 && parse->eapdata && data->phase2_success) { 1451 /* 1452 * TNC may be required as the next 1453 * authentication method within the tunnel. 1454 */ 1455 ret->methodState = METHOD_MAY_CONT; 1456 data->ready_for_tnc = 1; 1457 if (eap_ttls_process_tnc_start(sm, data, ret, parse, 1458 &resp) == 0) 1459 break; 1460 } 1461 #endif /* EAP_TNC */ 1462 return res; 1463 case EAP_TTLS_PHASE2_MSCHAP: 1464 case EAP_TTLS_PHASE2_PAP: 1465 case EAP_TTLS_PHASE2_CHAP: 1466 #ifdef EAP_TNC 1467 if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) < 1468 0) 1469 return -1; 1470 break; 1471 #else /* EAP_TNC */ 1472 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled 1473 * requests to the supplicant */ 1474 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected " 1475 "tunneled data"); 1476 return -1; 1477 #endif /* EAP_TNC */ 1478 } 1479 1480 if (resp) { 1481 if (eap_ttls_encrypt_response(sm, data, resp, identifier, 1482 out_data) < 0) 1483 return -1; 1484 } else if (config->pending_req_identity || 1485 config->pending_req_password || 1486 config->pending_req_otp || 1487 config->pending_req_new_password) { 1488 wpabuf_free(data->pending_phase2_req); 1489 data->pending_phase2_req = wpabuf_dup(in_decrypted); 1490 } 1491 1492 return 0; 1493 } 1494 1495 1496 #if EAP_TTLS_VERSION > 0 1497 static void eap_ttls_final_phase_finished(struct eap_sm *sm, 1498 struct eap_ttls_data *data, 1499 struct eap_method_ret *ret, 1500 u8 identifier, 1501 struct wpabuf **out_data) 1502 { 1503 wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received"); 1504 wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication succeeded"); 1505 ret->methodState = METHOD_DONE; 1506 ret->decision = DECISION_UNCOND_SUCC; 1507 data->phase2_success = 1; 1508 *out_data = eap_ttls_build_phase_finished(sm, data, identifier, 1); 1509 eap_ttls_v1_derive_key(sm, data); 1510 } 1511 #endif /* EAP_TTLS_VERSION */ 1512 1513 1514 static int eap_ttls_implicit_identity_request(struct eap_sm *sm, 1515 struct eap_ttls_data *data, 1516 struct eap_method_ret *ret, 1517 u8 identifier, 1518 struct wpabuf **out_data) 1519 { 1520 int retval = 0; 1521 struct eap_hdr *hdr; 1522 struct wpabuf *resp; 1523 1524 hdr = (struct eap_hdr *) eap_ttls_fake_identity_request(); 1525 if (hdr == NULL) { 1526 ret->methodState = METHOD_DONE; 1527 ret->decision = DECISION_FAIL; 1528 return -1; 1529 } 1530 1531 resp = NULL; 1532 if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) { 1533 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request " 1534 "processing failed"); 1535 retval = -1; 1536 } else { 1537 retval = eap_ttls_encrypt_response(sm, data, resp, identifier, 1538 out_data); 1539 } 1540 1541 os_free(hdr); 1542 1543 if (retval < 0) { 1544 ret->methodState = METHOD_DONE; 1545 ret->decision = DECISION_FAIL; 1546 } 1547 1548 return retval; 1549 } 1550 1551 1552 static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data, 1553 struct eap_method_ret *ret, u8 identifier, 1554 struct wpabuf **out_data) 1555 { 1556 data->phase2_start = 0; 1557 1558 /* 1559 * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only 1560 * if TLS part was indeed resuming a previous session. Most 1561 * Authentication Servers terminate EAP-TTLS before reaching this 1562 * point, but some do not. Make wpa_supplicant stop phase 2 here, if 1563 * needed. 1564 */ 1565 if (data->reauth && 1566 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) { 1567 wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - " 1568 "skip phase 2"); 1569 *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS, 1570 data->ttls_version); 1571 ret->methodState = METHOD_DONE; 1572 ret->decision = DECISION_UNCOND_SUCC; 1573 data->phase2_success = 1; 1574 return 0; 1575 } 1576 1577 return eap_ttls_implicit_identity_request(sm, data, ret, identifier, 1578 out_data); 1579 } 1580 1581 1582 static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data, 1583 struct eap_method_ret *ret, u8 identifier, 1584 const struct wpabuf *in_data, 1585 struct wpabuf **out_data) 1586 { 1587 struct wpabuf *in_decrypted = NULL; 1588 int retval = 0; 1589 struct ttls_parse_avp parse; 1590 1591 os_memset(&parse, 0, sizeof(parse)); 1592 1593 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for" 1594 " Phase 2", 1595 in_data ? (unsigned long) wpabuf_len(in_data) : 0); 1596 1597 if (data->pending_phase2_req) { 1598 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - " 1599 "skip decryption and use old data"); 1600 /* Clear TLS reassembly state. */ 1601 eap_peer_tls_reset_input(&data->ssl); 1602 1603 in_decrypted = data->pending_phase2_req; 1604 data->pending_phase2_req = NULL; 1605 if (wpabuf_len(in_decrypted) == 0) { 1606 wpabuf_free(in_decrypted); 1607 return eap_ttls_implicit_identity_request( 1608 sm, data, ret, identifier, out_data); 1609 } 1610 goto continue_req; 1611 } 1612 1613 if ((in_data == NULL || wpabuf_len(in_data) == 0) && 1614 data->phase2_start) { 1615 return eap_ttls_phase2_start(sm, data, ret, identifier, 1616 out_data); 1617 } 1618 1619 if (in_data == NULL || wpabuf_len(in_data) == 0) { 1620 /* Received TLS ACK - requesting more fragments */ 1621 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS, 1622 data->ttls_version, 1623 identifier, NULL, out_data); 1624 } 1625 1626 retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1627 if (retval) 1628 goto done; 1629 1630 #if EAP_TTLS_VERSION > 0 1631 if (data->ttls_version > 0 && 1632 (in_decrypted == NULL || wpabuf_len(in_decrypted) == 0) && 1633 tls_connection_ia_final_phase_finished(sm->ssl_ctx, 1634 data->ssl.conn)) { 1635 eap_ttls_final_phase_finished(sm, data, ret, identifier, 1636 out_data); 1637 goto done; 1638 } 1639 #endif /* EAP_TTLS_VERSION */ 1640 1641 continue_req: 1642 data->phase2_start = 0; 1643 1644 if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) { 1645 retval = -1; 1646 goto done; 1647 } 1648 1649 retval = eap_ttls_process_decrypted(sm, data, ret, identifier, 1650 &parse, in_decrypted, out_data); 1651 1652 done: 1653 wpabuf_free(in_decrypted); 1654 os_free(parse.eapdata); 1655 1656 if (retval < 0) { 1657 ret->methodState = METHOD_DONE; 1658 ret->decision = DECISION_FAIL; 1659 } 1660 1661 return retval; 1662 } 1663 1664 1665 static int eap_ttls_process_start(struct eap_sm *sm, 1666 struct eap_ttls_data *data, u8 flags, 1667 struct eap_method_ret *ret) 1668 { 1669 struct eap_peer_config *config = eap_get_config(sm); 1670 1671 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own ver=%d)", 1672 flags & EAP_TLS_VERSION_MASK, data->ttls_version); 1673 #if EAP_TTLS_VERSION > 0 1674 if ((flags & EAP_TLS_VERSION_MASK) < data->ttls_version) 1675 data->ttls_version = flags & EAP_TLS_VERSION_MASK; 1676 if (data->force_ttls_version >= 0 && 1677 data->force_ttls_version != data->ttls_version) { 1678 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to select " 1679 "forced TTLS version %d", 1680 data->force_ttls_version); 1681 ret->methodState = METHOD_DONE; 1682 ret->decision = DECISION_FAIL; 1683 ret->allowNotifications = FALSE; 1684 return -1; 1685 } 1686 wpa_printf(MSG_DEBUG, "EAP-TTLS: Using TTLS version %d", 1687 data->ttls_version); 1688 1689 if (data->ttls_version > 0) 1690 data->ssl.tls_ia = 1; 1691 #endif /* EAP_TTLS_VERSION */ 1692 if (!data->ssl_initialized && 1693 eap_peer_tls_ssl_init(sm, &data->ssl, config)) { 1694 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL."); 1695 return -1; 1696 } 1697 data->ssl_initialized = 1; 1698 1699 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start"); 1700 1701 return 0; 1702 } 1703 1704 1705 static int eap_ttls_process_handshake(struct eap_sm *sm, 1706 struct eap_ttls_data *data, 1707 struct eap_method_ret *ret, 1708 u8 identifier, 1709 const u8 *in_data, size_t in_len, 1710 struct wpabuf **out_data) 1711 { 1712 int res; 1713 1714 res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS, 1715 data->ttls_version, identifier, 1716 in_data, in_len, out_data); 1717 1718 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1719 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to " 1720 "Phase 2"); 1721 if (data->resuming) { 1722 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may " 1723 "skip Phase 2"); 1724 ret->decision = DECISION_COND_SUCC; 1725 ret->methodState = METHOD_MAY_CONT; 1726 } 1727 data->phase2_start = 1; 1728 if (data->ttls_version == 0) 1729 eap_ttls_v0_derive_key(sm, data); 1730 1731 if (*out_data == NULL || wpabuf_len(*out_data) == 0) { 1732 if (eap_ttls_decrypt(sm, data, ret, identifier, 1733 NULL, out_data)) { 1734 wpa_printf(MSG_WARNING, "EAP-TTLS: " 1735 "failed to process early " 1736 "start for Phase 2"); 1737 } 1738 res = 0; 1739 } 1740 data->resuming = 0; 1741 } 1742 1743 if (res == 2) { 1744 struct wpabuf msg; 1745 /* 1746 * Application data included in the handshake message. 1747 */ 1748 wpabuf_free(data->pending_phase2_req); 1749 data->pending_phase2_req = *out_data; 1750 *out_data = NULL; 1751 wpabuf_set(&msg, in_data, in_len); 1752 res = eap_ttls_decrypt(sm, data, ret, identifier, &msg, 1753 out_data); 1754 } 1755 1756 return res; 1757 } 1758 1759 1760 static void eap_ttls_check_auth_status(struct eap_sm *sm, 1761 struct eap_ttls_data *data, 1762 struct eap_method_ret *ret) 1763 { 1764 if (data->ttls_version == 0 && ret->methodState == METHOD_DONE) { 1765 ret->allowNotifications = FALSE; 1766 if (ret->decision == DECISION_UNCOND_SUCC || 1767 ret->decision == DECISION_COND_SUCC) { 1768 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " 1769 "completed successfully"); 1770 data->phase2_success = 1; 1771 #ifdef EAP_TNC 1772 if (!data->ready_for_tnc && !data->tnc_started) { 1773 /* 1774 * TNC may be required as the next 1775 * authentication method within the tunnel. 1776 */ 1777 ret->methodState = METHOD_MAY_CONT; 1778 data->ready_for_tnc = 1; 1779 } 1780 #endif /* EAP_TNC */ 1781 } 1782 } else if (data->ttls_version == 0 && 1783 ret->methodState == METHOD_MAY_CONT && 1784 (ret->decision == DECISION_UNCOND_SUCC || 1785 ret->decision == DECISION_COND_SUCC)) { 1786 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " 1787 "completed successfully (MAY_CONT)"); 1788 data->phase2_success = 1; 1789 } 1790 } 1791 1792 1793 static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv, 1794 struct eap_method_ret *ret, 1795 const struct wpabuf *reqData) 1796 { 1797 size_t left; 1798 int res; 1799 u8 flags, id; 1800 struct wpabuf *resp; 1801 const u8 *pos; 1802 struct eap_ttls_data *data = priv; 1803 1804 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret, 1805 reqData, &left, &flags); 1806 if (pos == NULL) 1807 return NULL; 1808 id = eap_get_id(reqData); 1809 1810 if (flags & EAP_TLS_FLAGS_START) { 1811 if (eap_ttls_process_start(sm, data, flags, ret) < 0) 1812 return NULL; 1813 1814 /* RFC 5281, Ch. 9.2: 1815 * "This packet MAY contain additional information in the form 1816 * of AVPs, which may provide useful hints to the client" 1817 * For now, ignore any potential extra data. 1818 */ 1819 left = 0; 1820 } else if (!data->ssl_initialized) { 1821 wpa_printf(MSG_DEBUG, "EAP-TTLS: First message did not " 1822 "include Start flag"); 1823 ret->methodState = METHOD_DONE; 1824 ret->decision = DECISION_FAIL; 1825 ret->allowNotifications = FALSE; 1826 return NULL; 1827 } 1828 1829 resp = NULL; 1830 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1831 !data->resuming) { 1832 struct wpabuf msg; 1833 wpabuf_set(&msg, pos, left); 1834 res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp); 1835 } else { 1836 res = eap_ttls_process_handshake(sm, data, ret, id, 1837 pos, left, &resp); 1838 } 1839 1840 eap_ttls_check_auth_status(sm, data, ret); 1841 1842 /* FIX: what about res == -1? Could just move all error processing into 1843 * the other functions and get rid of this res==1 case here. */ 1844 if (res == 1) { 1845 wpabuf_free(resp); 1846 return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS, 1847 data->ttls_version); 1848 } 1849 return resp; 1850 } 1851 1852 1853 static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv) 1854 { 1855 struct eap_ttls_data *data = priv; 1856 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1857 data->phase2_success; 1858 } 1859 1860 1861 static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv) 1862 { 1863 struct eap_ttls_data *data = priv; 1864 wpabuf_free(data->pending_phase2_req); 1865 data->pending_phase2_req = NULL; 1866 #ifdef EAP_TNC 1867 data->ready_for_tnc = 0; 1868 data->tnc_started = 0; 1869 #endif /* EAP_TNC */ 1870 } 1871 1872 1873 static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv) 1874 { 1875 struct eap_ttls_data *data = priv; 1876 os_free(data->key_data); 1877 data->key_data = NULL; 1878 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1879 os_free(data); 1880 return NULL; 1881 } 1882 if (data->phase2_priv && data->phase2_method && 1883 data->phase2_method->init_for_reauth) 1884 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1885 data->phase2_start = 0; 1886 data->phase2_success = 0; 1887 data->resuming = 1; 1888 data->reauth = 1; 1889 return priv; 1890 } 1891 1892 1893 static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf, 1894 size_t buflen, int verbose) 1895 { 1896 struct eap_ttls_data *data = priv; 1897 int len, ret; 1898 1899 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1900 ret = os_snprintf(buf + len, buflen - len, 1901 "EAP-TTLSv%d Phase2 method=", 1902 data->ttls_version); 1903 if (ret < 0 || (size_t) ret >= buflen - len) 1904 return len; 1905 len += ret; 1906 switch (data->phase2_type) { 1907 case EAP_TTLS_PHASE2_EAP: 1908 ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n", 1909 data->phase2_method ? 1910 data->phase2_method->name : "?"); 1911 break; 1912 case EAP_TTLS_PHASE2_MSCHAPV2: 1913 ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n"); 1914 break; 1915 case EAP_TTLS_PHASE2_MSCHAP: 1916 ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n"); 1917 break; 1918 case EAP_TTLS_PHASE2_PAP: 1919 ret = os_snprintf(buf + len, buflen - len, "PAP\n"); 1920 break; 1921 case EAP_TTLS_PHASE2_CHAP: 1922 ret = os_snprintf(buf + len, buflen - len, "CHAP\n"); 1923 break; 1924 default: 1925 ret = 0; 1926 break; 1927 } 1928 if (ret < 0 || (size_t) ret >= buflen - len) 1929 return len; 1930 len += ret; 1931 1932 return len; 1933 } 1934 1935 1936 static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv) 1937 { 1938 struct eap_ttls_data *data = priv; 1939 return data->key_data != NULL && data->phase2_success; 1940 } 1941 1942 1943 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len) 1944 { 1945 struct eap_ttls_data *data = priv; 1946 u8 *key; 1947 1948 if (data->key_data == NULL || !data->phase2_success) 1949 return NULL; 1950 1951 key = os_malloc(EAP_TLS_KEY_LEN); 1952 if (key == NULL) 1953 return NULL; 1954 1955 *len = EAP_TLS_KEY_LEN; 1956 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN); 1957 1958 return key; 1959 } 1960 1961 1962 int eap_peer_ttls_register(void) 1963 { 1964 struct eap_method *eap; 1965 int ret; 1966 1967 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1968 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS"); 1969 if (eap == NULL) 1970 return -1; 1971 1972 eap->init = eap_ttls_init; 1973 eap->deinit = eap_ttls_deinit; 1974 eap->process = eap_ttls_process; 1975 eap->isKeyAvailable = eap_ttls_isKeyAvailable; 1976 eap->getKey = eap_ttls_getKey; 1977 eap->get_status = eap_ttls_get_status; 1978 eap->has_reauth_data = eap_ttls_has_reauth_data; 1979 eap->deinit_for_reauth = eap_ttls_deinit_for_reauth; 1980 eap->init_for_reauth = eap_ttls_init_for_reauth; 1981 1982 ret = eap_peer_method_register(eap); 1983 if (ret) 1984 eap_peer_method_free(eap); 1985 return ret; 1986 } 1987
