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00015 #include "includes.h"
00016
00017 #include "common.h"
00018 #include "crypto/tls.h"
00019 #include "crypto/sha1.h"
00020 #include "eap_common/eap_tlv_common.h"
00021 #include "eap_i.h"
00022 #include "eap_tls_common.h"
00023 #include "eap_config.h"
00024 #include "eap_fast_pac.h"
00025
00026 #ifdef EAP_FAST_DYNAMIC
00027 #include "eap_fast_pac.c"
00028 #endif
00029
00030
00031
00032
00033
00034
00035
00036 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
00037
00038
00039 struct eap_fast_data {
00040 struct eap_ssl_data ssl;
00041
00042 int fast_version;
00043
00044 const struct eap_method *phase2_method;
00045 void *phase2_priv;
00046 int phase2_success;
00047
00048 struct eap_method_type phase2_type;
00049 struct eap_method_type *phase2_types;
00050 size_t num_phase2_types;
00051 int resuming;
00052 struct eap_fast_key_block_provisioning *key_block_p;
00053 #define EAP_FAST_PROV_UNAUTH 1
00054 #define EAP_FAST_PROV_AUTH 2
00055 int provisioning_allowed;
00056 int provisioning;
00057 int anon_provisioning;
00058
00059 int session_ticket_used;
00060
00061 u8 key_data[EAP_FAST_KEY_LEN];
00062 u8 emsk[EAP_EMSK_LEN];
00063 int success;
00064
00065 struct eap_fast_pac *pac;
00066 struct eap_fast_pac *current_pac;
00067 size_t max_pac_list_len;
00068 int use_pac_binary_format;
00069
00070 u8 simck[EAP_FAST_SIMCK_LEN];
00071 int simck_idx;
00072
00073 struct wpabuf *pending_phase2_req;
00074 };
00075
00076
00077 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
00078 const u8 *client_random,
00079 const u8 *server_random,
00080 u8 *master_secret)
00081 {
00082 struct eap_fast_data *data = ctx;
00083
00084 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
00085
00086 if (client_random == NULL || server_random == NULL ||
00087 master_secret == NULL) {
00088 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
00089 "back to full TLS handshake");
00090 data->session_ticket_used = 0;
00091 if (data->provisioning_allowed) {
00092 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
00093 "new PAC-Key");
00094 data->provisioning = 1;
00095 data->current_pac = NULL;
00096 }
00097 return 0;
00098 }
00099
00100 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
00101
00102 if (data->current_pac == NULL) {
00103 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
00104 "using SessionTicket");
00105 data->session_ticket_used = 0;
00106 return 0;
00107 }
00108
00109 eap_fast_derive_master_secret(data->current_pac->pac_key,
00110 server_random, client_random,
00111 master_secret);
00112
00113 data->session_ticket_used = 1;
00114
00115 return 1;
00116 }
00117
00118
00119 static int eap_fast_parse_phase1(struct eap_fast_data *data,
00120 const char *phase1)
00121 {
00122 const char *pos;
00123
00124 pos = os_strstr(phase1, "fast_provisioning=");
00125 if (pos) {
00126 data->provisioning_allowed = atoi(pos + 18);
00127 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
00128 "mode: %d", data->provisioning_allowed);
00129 }
00130
00131 pos = os_strstr(phase1, "fast_max_pac_list_len=");
00132 if (pos) {
00133 data->max_pac_list_len = atoi(pos + 22);
00134 if (data->max_pac_list_len == 0)
00135 data->max_pac_list_len = 1;
00136 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
00137 (unsigned long) data->max_pac_list_len);
00138 }
00139
00140 pos = os_strstr(phase1, "fast_pac_format=binary");
00141 if (pos) {
00142 data->use_pac_binary_format = 1;
00143 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
00144 "list");
00145 }
00146
00147 return 0;
00148 }
00149
00150
00151 static void * eap_fast_init(struct eap_sm *sm)
00152 {
00153 struct eap_fast_data *data;
00154 struct eap_peer_config *config = eap_get_config(sm);
00155
00156 data = os_zalloc(sizeof(*data));
00157 if (data == NULL)
00158 return NULL;
00159 data->fast_version = EAP_FAST_VERSION;
00160 data->max_pac_list_len = 10;
00161
00162 if (config && config->phase1 &&
00163 eap_fast_parse_phase1(data, config->phase1) < 0) {
00164 eap_fast_deinit(sm, data);
00165 return NULL;
00166 }
00167
00168 if (eap_peer_select_phase2_methods(config, "auth=",
00169 &data->phase2_types,
00170 &data->num_phase2_types) < 0) {
00171 eap_fast_deinit(sm, data);
00172 return NULL;
00173 }
00174
00175 data->phase2_type.vendor = EAP_VENDOR_IETF;
00176 data->phase2_type.method = EAP_TYPE_NONE;
00177
00178 if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
00179 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
00180 eap_fast_deinit(sm, data);
00181 return NULL;
00182 }
00183
00184 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
00185 eap_fast_session_ticket_cb,
00186 data) < 0) {
00187 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
00188 "callback");
00189 eap_fast_deinit(sm, data);
00190 return NULL;
00191 }
00192
00193
00194
00195
00196
00197
00198 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
00199 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
00200 "workarounds");
00201 }
00202
00203 if (data->use_pac_binary_format &&
00204 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
00205 eap_fast_deinit(sm, data);
00206 return NULL;
00207 }
00208
00209 if (!data->use_pac_binary_format &&
00210 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
00211 eap_fast_deinit(sm, data);
00212 return NULL;
00213 }
00214 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
00215
00216 if (data->pac == NULL && !data->provisioning_allowed) {
00217 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
00218 "provisioning disabled");
00219 eap_fast_deinit(sm, data);
00220 return NULL;
00221 }
00222
00223 return data;
00224 }
00225
00226
00227 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
00228 {
00229 struct eap_fast_data *data = priv;
00230 struct eap_fast_pac *pac, *prev;
00231
00232 if (data == NULL)
00233 return;
00234 if (data->phase2_priv && data->phase2_method)
00235 data->phase2_method->deinit(sm, data->phase2_priv);
00236 os_free(data->phase2_types);
00237 os_free(data->key_block_p);
00238 eap_peer_tls_ssl_deinit(sm, &data->ssl);
00239
00240 pac = data->pac;
00241 prev = NULL;
00242 while (pac) {
00243 prev = pac;
00244 pac = pac->next;
00245 eap_fast_free_pac(prev);
00246 }
00247 wpabuf_free(data->pending_phase2_req);
00248 os_free(data);
00249 }
00250
00251
00252 static int eap_fast_derive_msk(struct eap_fast_data *data)
00253 {
00254 eap_fast_derive_eap_msk(data->simck, data->key_data);
00255 eap_fast_derive_eap_emsk(data->simck, data->emsk);
00256 data->success = 1;
00257 return 0;
00258 }
00259
00260
00261 static void eap_fast_derive_key_auth(struct eap_sm *sm,
00262 struct eap_fast_data *data)
00263 {
00264 u8 *sks;
00265
00266
00267
00268
00269
00270 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
00271 EAP_FAST_SKS_LEN);
00272 if (sks == NULL) {
00273 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
00274 "session_key_seed");
00275 return;
00276 }
00277
00278
00279
00280
00281
00282 wpa_hexdump_key(MSG_DEBUG,
00283 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
00284 sks, EAP_FAST_SKS_LEN);
00285 data->simck_idx = 0;
00286 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
00287 os_free(sks);
00288 }
00289
00290
00291 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
00292 struct eap_fast_data *data)
00293 {
00294 os_free(data->key_block_p);
00295 data->key_block_p = (struct eap_fast_key_block_provisioning *)
00296 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
00297 "key expansion",
00298 sizeof(*data->key_block_p));
00299 if (data->key_block_p == NULL) {
00300 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
00301 return;
00302 }
00303
00304
00305
00306
00307 wpa_hexdump_key(MSG_DEBUG,
00308 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
00309 data->key_block_p->session_key_seed,
00310 sizeof(data->key_block_p->session_key_seed));
00311 data->simck_idx = 0;
00312 os_memcpy(data->simck, data->key_block_p->session_key_seed,
00313 EAP_FAST_SIMCK_LEN);
00314 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
00315 data->key_block_p->server_challenge,
00316 sizeof(data->key_block_p->server_challenge));
00317 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
00318 data->key_block_p->client_challenge,
00319 sizeof(data->key_block_p->client_challenge));
00320 }
00321
00322
00323 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
00324 {
00325 if (data->anon_provisioning)
00326 eap_fast_derive_key_provisioning(sm, data);
00327 else
00328 eap_fast_derive_key_auth(sm, data);
00329 }
00330
00331
00332 static int eap_fast_init_phase2_method(struct eap_sm *sm,
00333 struct eap_fast_data *data)
00334 {
00335 data->phase2_method =
00336 eap_peer_get_eap_method(data->phase2_type.vendor,
00337 data->phase2_type.method);
00338 if (data->phase2_method == NULL)
00339 return -1;
00340
00341 if (data->key_block_p) {
00342 sm->auth_challenge = data->key_block_p->server_challenge;
00343 sm->peer_challenge = data->key_block_p->client_challenge;
00344 }
00345 sm->init_phase2 = 1;
00346 data->phase2_priv = data->phase2_method->init(sm);
00347 sm->init_phase2 = 0;
00348 sm->auth_challenge = NULL;
00349 sm->peer_challenge = NULL;
00350
00351 return data->phase2_priv == NULL ? -1 : 0;
00352 }
00353
00354
00355 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
00356 {
00357 size_t i;
00358
00359
00360
00361
00362 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
00363 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
00364 "during unauthenticated provisioning; reject phase2"
00365 " type %d", type);
00366 return -1;
00367 }
00368
00369 #ifdef EAP_TNC
00370 if (type == EAP_TYPE_TNC) {
00371 data->phase2_type.vendor = EAP_VENDOR_IETF;
00372 data->phase2_type.method = EAP_TYPE_TNC;
00373 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
00374 "vendor %d method %d for TNC",
00375 data->phase2_type.vendor,
00376 data->phase2_type.method);
00377 return 0;
00378 }
00379 #endif
00380
00381 for (i = 0; i < data->num_phase2_types; i++) {
00382 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
00383 data->phase2_types[i].method != type)
00384 continue;
00385
00386 data->phase2_type.vendor = data->phase2_types[i].vendor;
00387 data->phase2_type.method = data->phase2_types[i].method;
00388 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
00389 "vendor %d method %d",
00390 data->phase2_type.vendor,
00391 data->phase2_type.method);
00392 break;
00393 }
00394
00395 if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
00396 return -1;
00397
00398 return 0;
00399 }
00400
00401
00402 static int eap_fast_phase2_request(struct eap_sm *sm,
00403 struct eap_fast_data *data,
00404 struct eap_method_ret *ret,
00405 struct eap_hdr *hdr,
00406 struct wpabuf **resp)
00407 {
00408 size_t len = be_to_host16(hdr->length);
00409 u8 *pos;
00410 struct eap_method_ret iret;
00411 struct eap_peer_config *config = eap_get_config(sm);
00412 struct wpabuf msg;
00413
00414 if (len <= sizeof(struct eap_hdr)) {
00415 wpa_printf(MSG_INFO, "EAP-FAST: too short "
00416 "Phase 2 request (len=%lu)", (unsigned long) len);
00417 return -1;
00418 }
00419 pos = (u8 *) (hdr + 1);
00420 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
00421 if (*pos == EAP_TYPE_IDENTITY) {
00422 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
00423 return 0;
00424 }
00425
00426 if (data->phase2_priv && data->phase2_method &&
00427 *pos != data->phase2_type.method) {
00428 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
00429 "deinitialize previous method");
00430 data->phase2_method->deinit(sm, data->phase2_priv);
00431 data->phase2_method = NULL;
00432 data->phase2_priv = NULL;
00433 data->phase2_type.vendor = EAP_VENDOR_IETF;
00434 data->phase2_type.method = EAP_TYPE_NONE;
00435 }
00436
00437 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
00438 data->phase2_type.method == EAP_TYPE_NONE &&
00439 eap_fast_select_phase2_method(data, *pos) < 0) {
00440 if (eap_peer_tls_phase2_nak(data->phase2_types,
00441 data->num_phase2_types,
00442 hdr, resp))
00443 return -1;
00444 return 0;
00445 }
00446
00447 if (data->phase2_priv == NULL &&
00448 eap_fast_init_phase2_method(sm, data) < 0) {
00449 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
00450 "Phase 2 EAP method %d", *pos);
00451 ret->methodState = METHOD_DONE;
00452 ret->decision = DECISION_FAIL;
00453 return -1;
00454 }
00455
00456 os_memset(&iret, 0, sizeof(iret));
00457 wpabuf_set(&msg, hdr, len);
00458 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
00459 &msg);
00460 if (*resp == NULL ||
00461 (iret.methodState == METHOD_DONE &&
00462 iret.decision == DECISION_FAIL)) {
00463 ret->methodState = METHOD_DONE;
00464 ret->decision = DECISION_FAIL;
00465 } else if ((iret.methodState == METHOD_DONE ||
00466 iret.methodState == METHOD_MAY_CONT) &&
00467 (iret.decision == DECISION_UNCOND_SUCC ||
00468 iret.decision == DECISION_COND_SUCC)) {
00469 data->phase2_success = 1;
00470 }
00471
00472 if (*resp == NULL && config &&
00473 (config->pending_req_identity || config->pending_req_password ||
00474 config->pending_req_otp || config->pending_req_new_password)) {
00475 wpabuf_free(data->pending_phase2_req);
00476 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
00477 } else if (*resp == NULL)
00478 return -1;
00479
00480 return 0;
00481 }
00482
00483
00484 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
00485 {
00486 struct wpabuf *buf;
00487 struct eap_tlv_nak_tlv *nak;
00488 buf = wpabuf_alloc(sizeof(*nak));
00489 if (buf == NULL)
00490 return NULL;
00491 nak = wpabuf_put(buf, sizeof(*nak));
00492 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
00493 nak->length = host_to_be16(6);
00494 nak->vendor_id = host_to_be32(vendor_id);
00495 nak->nak_type = host_to_be16(tlv_type);
00496 return buf;
00497 }
00498
00499
00500 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
00501 {
00502 struct wpabuf *buf;
00503 struct eap_tlv_intermediate_result_tlv *result;
00504 buf = wpabuf_alloc(sizeof(*result));
00505 if (buf == NULL)
00506 return NULL;
00507 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
00508 intermediate ? "Intermediate " : "", status);
00509 result = wpabuf_put(buf, sizeof(*result));
00510 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
00511 (intermediate ?
00512 EAP_TLV_INTERMEDIATE_RESULT_TLV :
00513 EAP_TLV_RESULT_TLV));
00514 result->length = host_to_be16(2);
00515 result->status = host_to_be16(status);
00516 return buf;
00517 }
00518
00519
00520 static struct wpabuf * eap_fast_tlv_pac_ack(void)
00521 {
00522 struct wpabuf *buf;
00523 struct eap_tlv_result_tlv *res;
00524 struct eap_tlv_pac_ack_tlv *ack;
00525
00526 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
00527 if (buf == NULL)
00528 return NULL;
00529
00530 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
00531 ack = wpabuf_put(buf, sizeof(*ack));
00532 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
00533 EAP_TLV_TYPE_MANDATORY);
00534 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
00535 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
00536 ack->pac_len = host_to_be16(2);
00537 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
00538
00539 return buf;
00540 }
00541
00542
00543 static struct wpabuf * eap_fast_process_eap_payload_tlv(
00544 struct eap_sm *sm, struct eap_fast_data *data,
00545 struct eap_method_ret *ret, const struct eap_hdr *req,
00546 u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
00547 {
00548 struct eap_hdr *hdr;
00549 struct wpabuf *resp = NULL;
00550
00551 if (eap_payload_tlv_len < sizeof(*hdr)) {
00552 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
00553 "Payload TLV (len=%lu)",
00554 (unsigned long) eap_payload_tlv_len);
00555 return NULL;
00556 }
00557
00558 hdr = (struct eap_hdr *) eap_payload_tlv;
00559 if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
00560 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
00561 "EAP Payload TLV");
00562 return NULL;
00563 }
00564
00565 if (hdr->code != EAP_CODE_REQUEST) {
00566 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
00567 "Phase 2 EAP header", hdr->code);
00568 return NULL;
00569 }
00570
00571 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
00572 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
00573 "failed");
00574 return NULL;
00575 }
00576
00577 return eap_fast_tlv_eap_payload(resp);
00578 }
00579
00580
00581 static int eap_fast_validate_crypto_binding(
00582 struct eap_tlv_crypto_binding_tlv *_bind)
00583 {
00584 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
00585 "Received Version %d SubType %d",
00586 _bind->version, _bind->received_version, _bind->subtype);
00587 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
00588 _bind->nonce, sizeof(_bind->nonce));
00589 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
00590 _bind->compound_mac, sizeof(_bind->compound_mac));
00591
00592 if (_bind->version != EAP_FAST_VERSION ||
00593 _bind->received_version != EAP_FAST_VERSION ||
00594 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
00595 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
00596 "Crypto-Binding TLV: Version %d "
00597 "Received Version %d SubType %d",
00598 _bind->version, _bind->received_version,
00599 _bind->subtype);
00600 return -1;
00601 }
00602
00603 return 0;
00604 }
00605
00606
00607 static void eap_fast_write_crypto_binding(
00608 struct eap_tlv_crypto_binding_tlv *rbind,
00609 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
00610 {
00611 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
00612 EAP_TLV_CRYPTO_BINDING_TLV);
00613 rbind->length = host_to_be16(sizeof(*rbind) -
00614 sizeof(struct eap_tlv_hdr));
00615 rbind->version = EAP_FAST_VERSION;
00616 rbind->received_version = _bind->version;
00617 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
00618 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
00619 inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
00620 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
00621 rbind->compound_mac);
00622
00623 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
00624 "Received Version %d SubType %d",
00625 rbind->version, rbind->received_version, rbind->subtype);
00626 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
00627 rbind->nonce, sizeof(rbind->nonce));
00628 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
00629 rbind->compound_mac, sizeof(rbind->compound_mac));
00630 }
00631
00632
00633 static int eap_fast_get_phase2_key(struct eap_sm *sm,
00634 struct eap_fast_data *data,
00635 u8 *isk, size_t isk_len)
00636 {
00637 u8 *key;
00638 size_t key_len;
00639
00640 os_memset(isk, 0, isk_len);
00641
00642 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
00643 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
00644 "available");
00645 return -1;
00646 }
00647
00648 if (data->phase2_method->isKeyAvailable == NULL ||
00649 data->phase2_method->getKey == NULL)
00650 return 0;
00651
00652 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
00653 (key = data->phase2_method->getKey(sm, data->phase2_priv,
00654 &key_len)) == NULL) {
00655 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
00656 "from Phase 2");
00657 return -1;
00658 }
00659
00660 if (key_len > isk_len)
00661 key_len = isk_len;
00662 if (key_len == 32 &&
00663 data->phase2_method->vendor == EAP_VENDOR_IETF &&
00664 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
00665
00666
00667
00668
00669
00670 os_memcpy(isk, key + 16, 16);
00671 os_memcpy(isk + 16, key, 16);
00672 } else
00673 os_memcpy(isk, key, key_len);
00674 os_free(key);
00675
00676 return 0;
00677 }
00678
00679
00680 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
00681 u8 *cmk)
00682 {
00683 u8 isk[32], imck[60];
00684
00685 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
00686 "calculation", data->simck_idx + 1);
00687
00688
00689
00690
00691
00692
00693
00694
00695
00696 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
00697 return -1;
00698 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
00699 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
00700 "Inner Methods Compound Keys",
00701 isk, sizeof(isk), imck, sizeof(imck));
00702 data->simck_idx++;
00703 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
00704 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
00705 data->simck, EAP_FAST_SIMCK_LEN);
00706 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
00707 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
00708 cmk, EAP_FAST_CMK_LEN);
00709
00710 return 0;
00711 }
00712
00713
00714 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
00715 {
00716 struct eap_tlv_hdr *pac;
00717 struct eap_tlv_request_action_tlv *act;
00718 struct eap_tlv_pac_type_tlv *type;
00719
00720 act = (struct eap_tlv_request_action_tlv *) pos;
00721 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
00722 act->length = host_to_be16(2);
00723 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
00724
00725 pac = (struct eap_tlv_hdr *) (act + 1);
00726 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
00727 pac->length = host_to_be16(sizeof(*type));
00728
00729 type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
00730 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
00731 type->length = host_to_be16(2);
00732 type->pac_type = host_to_be16(pac_type);
00733
00734 return (u8 *) (type + 1);
00735 }
00736
00737
00738 static struct wpabuf * eap_fast_process_crypto_binding(
00739 struct eap_sm *sm, struct eap_fast_data *data,
00740 struct eap_method_ret *ret,
00741 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
00742 {
00743 struct wpabuf *resp;
00744 u8 *pos;
00745 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
00746 int res;
00747 size_t len;
00748
00749 if (eap_fast_validate_crypto_binding(_bind) < 0)
00750 return NULL;
00751
00752 if (eap_fast_get_cmk(sm, data, cmk) < 0)
00753 return NULL;
00754
00755
00756 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
00757 os_memset(_bind->compound_mac, 0, sizeof(cmac));
00758 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
00759 "MAC calculation", (u8 *) _bind, bind_len);
00760 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
00761 _bind->compound_mac);
00762 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
00763 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
00764 cmac, sizeof(cmac));
00765 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
00766 _bind->compound_mac, sizeof(cmac));
00767 if (res != 0) {
00768 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
00769 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
00770 return NULL;
00771 }
00772
00773
00774
00775
00776
00777
00778 len = sizeof(struct eap_tlv_crypto_binding_tlv);
00779 resp = wpabuf_alloc(len);
00780 if (resp == NULL)
00781 return NULL;
00782
00783 if (!data->anon_provisioning && data->phase2_success &&
00784 eap_fast_derive_msk(data) < 0) {
00785 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
00786 ret->methodState = METHOD_DONE;
00787 ret->decision = DECISION_FAIL;
00788 data->phase2_success = 0;
00789 wpabuf_free(resp);
00790 return NULL;
00791 }
00792
00793 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
00794 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
00795 pos, _bind, cmk);
00796
00797 return resp;
00798 }
00799
00800
00801 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
00802 u8 *pos, size_t len, int *pac_key_found)
00803 {
00804 switch (type & 0x7fff) {
00805 case PAC_TYPE_PAC_KEY:
00806 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
00807 if (len != EAP_FAST_PAC_KEY_LEN) {
00808 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
00809 "length %lu", (unsigned long) len);
00810 break;
00811 }
00812 *pac_key_found = 1;
00813 os_memcpy(entry->pac_key, pos, len);
00814 break;
00815 case PAC_TYPE_PAC_OPAQUE:
00816 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
00817 entry->pac_opaque = pos;
00818 entry->pac_opaque_len = len;
00819 break;
00820 case PAC_TYPE_PAC_INFO:
00821 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
00822 entry->pac_info = pos;
00823 entry->pac_info_len = len;
00824 break;
00825 default:
00826 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
00827 type);
00828 break;
00829 }
00830 }
00831
00832
00833 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
00834 u8 *pac, size_t pac_len)
00835 {
00836 struct pac_tlv_hdr *hdr;
00837 u8 *pos;
00838 size_t left, len;
00839 int type, pac_key_found = 0;
00840
00841 pos = pac;
00842 left = pac_len;
00843
00844 while (left > sizeof(*hdr)) {
00845 hdr = (struct pac_tlv_hdr *) pos;
00846 type = be_to_host16(hdr->type);
00847 len = be_to_host16(hdr->len);
00848 pos += sizeof(*hdr);
00849 left -= sizeof(*hdr);
00850 if (len > left) {
00851 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
00852 "(type=%d len=%lu left=%lu)",
00853 type, (unsigned long) len,
00854 (unsigned long) left);
00855 return -1;
00856 }
00857
00858 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
00859
00860 pos += len;
00861 left -= len;
00862 }
00863
00864 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
00865 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
00866 "all the required fields");
00867 return -1;
00868 }
00869
00870 return 0;
00871 }
00872
00873
00874 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
00875 u8 *pos, size_t len)
00876 {
00877 u16 pac_type;
00878 u32 lifetime;
00879 struct os_time now;
00880
00881 switch (type & 0x7fff) {
00882 case PAC_TYPE_CRED_LIFETIME:
00883 if (len != 4) {
00884 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
00885 "Invalid CRED_LIFETIME length - ignored",
00886 pos, len);
00887 return 0;
00888 }
00889
00890
00891
00892
00893
00894
00895
00896 lifetime = WPA_GET_BE32(pos);
00897 os_get_time(&now);
00898 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
00899 "(%d days)",
00900 lifetime, (lifetime - (u32) now.sec) / 86400);
00901 break;
00902 case PAC_TYPE_A_ID:
00903 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
00904 pos, len);
00905 entry->a_id = pos;
00906 entry->a_id_len = len;
00907 break;
00908 case PAC_TYPE_I_ID:
00909 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
00910 pos, len);
00911 entry->i_id = pos;
00912 entry->i_id_len = len;
00913 break;
00914 case PAC_TYPE_A_ID_INFO:
00915 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
00916 pos, len);
00917 entry->a_id_info = pos;
00918 entry->a_id_info_len = len;
00919 break;
00920 case PAC_TYPE_PAC_TYPE:
00921
00922 if (len != 2) {
00923 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
00924 "length %lu (expected 2)",
00925 (unsigned long) len);
00926 wpa_hexdump_ascii(MSG_DEBUG,
00927 "EAP-FAST: PAC-Info - PAC-Type",
00928 pos, len);
00929 return -1;
00930 }
00931 pac_type = WPA_GET_BE16(pos);
00932 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
00933 pac_type != PAC_TYPE_USER_AUTHORIZATION &&
00934 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
00935 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
00936 "%d", pac_type);
00937 return -1;
00938 }
00939
00940 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
00941 pac_type);
00942 entry->pac_type = pac_type;
00943 break;
00944 default:
00945 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
00946 "type %d", type);
00947 break;
00948 }
00949
00950 return 0;
00951 }
00952
00953
00954 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
00955 {
00956 struct pac_tlv_hdr *hdr;
00957 u8 *pos;
00958 size_t left, len;
00959 int type;
00960
00961
00962
00963
00964 entry->pac_type = PAC_TYPE_TUNNEL_PAC;
00965
00966 pos = entry->pac_info;
00967 left = entry->pac_info_len;
00968 while (left > sizeof(*hdr)) {
00969 hdr = (struct pac_tlv_hdr *) pos;
00970 type = be_to_host16(hdr->type);
00971 len = be_to_host16(hdr->len);
00972 pos += sizeof(*hdr);
00973 left -= sizeof(*hdr);
00974 if (len > left) {
00975 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
00976 "(type=%d len=%lu left=%lu)",
00977 type, (unsigned long) len,
00978 (unsigned long) left);
00979 return -1;
00980 }
00981
00982 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
00983 return -1;
00984
00985 pos += len;
00986 left -= len;
00987 }
00988
00989 if (entry->a_id == NULL || entry->a_id_info == NULL) {
00990 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
00991 "all the required fields");
00992 return -1;
00993 }
00994
00995 return 0;
00996 }
00997
00998
00999 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
01000 struct eap_fast_data *data,
01001 struct eap_method_ret *ret,
01002 u8 *pac, size_t pac_len)
01003 {
01004 struct eap_peer_config *config = eap_get_config(sm);
01005 struct eap_fast_pac entry;
01006
01007 os_memset(&entry, 0, sizeof(entry));
01008 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
01009 eap_fast_process_pac_info(&entry))
01010 return NULL;
01011
01012 eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
01013 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
01014 if (data->use_pac_binary_format)
01015 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
01016 else
01017 eap_fast_save_pac(sm, data->pac, config->pac_file);
01018
01019 if (data->provisioning) {
01020 if (data->anon_provisioning) {
01021
01022
01023
01024
01025
01026 data->success = 0;
01027 ret->decision = DECISION_FAIL;
01028 } else {
01029
01030
01031
01032
01033 ret->decision = DECISION_COND_SUCC;
01034 }
01035 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
01036 "- Provisioning completed successfully");
01037 } else {
01038
01039
01040
01041
01042 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
01043 "- PAC refreshing completed successfully");
01044 ret->decision = DECISION_UNCOND_SUCC;
01045 }
01046 ret->methodState = METHOD_DONE;
01047 return eap_fast_tlv_pac_ack();
01048 }
01049
01050
01051 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
01052 struct eap_fast_tlv_parse *tlv,
01053 struct wpabuf **resp)
01054 {
01055 int mandatory, tlv_type, len, res;
01056 u8 *pos, *end;
01057
01058 os_memset(tlv, 0, sizeof(*tlv));
01059
01060
01061 pos = wpabuf_mhead(decrypted);
01062 end = pos + wpabuf_len(decrypted);
01063 while (pos + 4 < end) {
01064 mandatory = pos[0] & 0x80;
01065 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
01066 pos += 2;
01067 len = WPA_GET_BE16(pos);
01068 pos += 2;
01069 if (pos + len > end) {
01070 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
01071 return -1;
01072 }
01073 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
01074 "TLV type %d length %d%s",
01075 tlv_type, len, mandatory ? " (mandatory)" : "");
01076
01077 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
01078 if (res == -2)
01079 break;
01080 if (res < 0) {
01081 if (mandatory) {
01082 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
01083 "mandatory TLV type %d", tlv_type);
01084 *resp = eap_fast_tlv_nak(0, tlv_type);
01085 break;
01086 } else {
01087 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
01088 "unknown optional TLV type %d",
01089 tlv_type);
01090 }
01091 }
01092
01093 pos += len;
01094 }
01095
01096 return 0;
01097 }
01098
01099
01100 static int eap_fast_encrypt_response(struct eap_sm *sm,
01101 struct eap_fast_data *data,
01102 struct wpabuf *resp,
01103 u8 identifier, struct wpabuf **out_data)
01104 {
01105 if (resp == NULL)
01106 return 0;
01107
01108 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
01109 resp);
01110 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
01111 data->fast_version, identifier,
01112 resp, out_data)) {
01113 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
01114 "frame");
01115 }
01116 wpabuf_free(resp);
01117
01118 return 0;
01119 }
01120
01121
01122 static struct wpabuf * eap_fast_pac_request(void)
01123 {
01124 struct wpabuf *tmp;
01125 u8 *pos, *pos2;
01126
01127 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
01128 sizeof(struct eap_tlv_request_action_tlv) +
01129 sizeof(struct eap_tlv_pac_type_tlv));
01130 if (tmp == NULL)
01131 return NULL;
01132
01133 pos = wpabuf_put(tmp, 0);
01134 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
01135 wpabuf_put(tmp, pos2 - pos);
01136 return tmp;
01137 }
01138
01139
01140 static int eap_fast_process_decrypted(struct eap_sm *sm,
01141 struct eap_fast_data *data,
01142 struct eap_method_ret *ret,
01143 const struct eap_hdr *req,
01144 struct wpabuf *decrypted,
01145 struct wpabuf **out_data)
01146 {
01147 struct wpabuf *resp = NULL, *tmp;
01148 struct eap_fast_tlv_parse tlv;
01149 int failed = 0;
01150
01151 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
01152 return 0;
01153 if (resp)
01154 return eap_fast_encrypt_response(sm, data, resp,
01155 req->identifier, out_data);
01156
01157 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
01158 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
01159 return eap_fast_encrypt_response(sm, data, resp,
01160 req->identifier, out_data);
01161 }
01162
01163 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
01164 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
01165 return eap_fast_encrypt_response(sm, data, resp,
01166 req->identifier, out_data);
01167 }
01168
01169 if (tlv.crypto_binding) {
01170 tmp = eap_fast_process_crypto_binding(sm, data, ret,
01171 tlv.crypto_binding,
01172 tlv.crypto_binding_len);
01173 if (tmp == NULL)
01174 failed = 1;
01175 else
01176 resp = wpabuf_concat(resp, tmp);
01177 }
01178
01179 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
01180 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
01181 EAP_TLV_RESULT_SUCCESS, 1);
01182 resp = wpabuf_concat(resp, tmp);
01183 }
01184
01185 if (tlv.eap_payload_tlv) {
01186 tmp = eap_fast_process_eap_payload_tlv(
01187 sm, data, ret, req, tlv.eap_payload_tlv,
01188 tlv.eap_payload_tlv_len);
01189 resp = wpabuf_concat(resp, tmp);
01190 }
01191
01192 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
01193 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
01194 "acknowledging success");
01195 failed = 1;
01196 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
01197 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
01198 tlv.pac_len);
01199 resp = wpabuf_concat(resp, tmp);
01200 }
01201
01202 if (data->current_pac == NULL && data->provisioning &&
01203 !data->anon_provisioning && !tlv.pac &&
01204 (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
01205 tlv.result == EAP_TLV_RESULT_SUCCESS)) {
01206
01207
01208
01209
01210 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
01211 tmp = eap_fast_pac_request();
01212 resp = wpabuf_concat(resp, tmp);
01213 }
01214
01215 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
01216 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
01217 resp = wpabuf_concat(tmp, resp);
01218 } else if (failed) {
01219 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
01220 resp = wpabuf_concat(tmp, resp);
01221 }
01222
01223 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
01224 tlv.crypto_binding && data->phase2_success) {
01225 if (data->anon_provisioning) {
01226 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
01227 "provisioning completed successfully.");
01228 ret->methodState = METHOD_DONE;
01229 ret->decision = DECISION_FAIL;
01230 } else {
01231 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
01232 "completed successfully.");
01233 if (data->provisioning)
01234 ret->methodState = METHOD_MAY_CONT;
01235 else
01236 ret->methodState = METHOD_DONE;
01237 ret->decision = DECISION_UNCOND_SUCC;
01238 }
01239 }
01240
01241 if (resp == NULL) {
01242 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
01243 "empty response packet");
01244 resp = wpabuf_alloc(1);
01245 }
01246
01247 return eap_fast_encrypt_response(sm, data, resp, req->identifier,
01248 out_data);
01249 }
01250
01251
01252 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
01253 struct eap_method_ret *ret,
01254 const struct eap_hdr *req,
01255 const struct wpabuf *in_data,
01256 struct wpabuf **out_data)
01257 {
01258 struct wpabuf *in_decrypted;
01259 int res;
01260
01261 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
01262 " Phase 2", (unsigned long) wpabuf_len(in_data));
01263
01264 if (data->pending_phase2_req) {
01265 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
01266 "skip decryption and use old data");
01267
01268 eap_peer_tls_reset_input(&data->ssl);
01269
01270 in_decrypted = data->pending_phase2_req;
01271 data->pending_phase2_req = NULL;
01272 goto continue_req;
01273 }
01274
01275 if (wpabuf_len(in_data) == 0) {
01276
01277 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
01278 data->fast_version,
01279 req->identifier, NULL, out_data);
01280 }
01281
01282 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
01283 if (res)
01284 return res;
01285
01286 continue_req:
01287 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
01288 in_decrypted);
01289
01290 if (wpabuf_len(in_decrypted) < 4) {
01291 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
01292 "TLV frame (len=%lu)",
01293 (unsigned long) wpabuf_len(in_decrypted));
01294 wpabuf_free(in_decrypted);
01295 return -1;
01296 }
01297
01298 res = eap_fast_process_decrypted(sm, data, ret, req,
01299 in_decrypted, out_data);
01300
01301 wpabuf_free(in_decrypted);
01302
01303 return res;
01304 }
01305
01306
01307 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
01308 {
01309 const u8 *a_id;
01310 struct pac_tlv_hdr *hdr;
01311
01312
01313
01314
01315
01316 a_id = buf;
01317 *id_len = len;
01318 if (len > sizeof(*hdr)) {
01319 int tlen;
01320 hdr = (struct pac_tlv_hdr *) buf;
01321 tlen = be_to_host16(hdr->len);
01322 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
01323 sizeof(*hdr) + tlen <= len) {
01324 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
01325 "(Start)");
01326 a_id = (u8 *) (hdr + 1);
01327 *id_len = tlen;
01328 }
01329 }
01330 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
01331
01332 return a_id;
01333 }
01334
01335
01336 static void eap_fast_select_pac(struct eap_fast_data *data,
01337 const u8 *a_id, size_t a_id_len)
01338 {
01339 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
01340 PAC_TYPE_TUNNEL_PAC);
01341 if (data->current_pac == NULL) {
01342
01343
01344
01345
01346 data->current_pac = eap_fast_get_pac(
01347 data->pac, a_id, a_id_len,
01348 PAC_TYPE_MACHINE_AUTHENTICATION);
01349 }
01350
01351 if (data->current_pac) {
01352 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
01353 "(PAC-Type %d)", data->current_pac->pac_type);
01354 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
01355 data->current_pac->a_id_info,
01356 data->current_pac->a_id_info_len);
01357 }
01358 }
01359
01360
01361 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
01362 struct eap_fast_data *data,
01363 struct eap_fast_pac *pac)
01364 {
01365 u8 *tlv;
01366 size_t tlv_len, olen;
01367 struct eap_tlv_hdr *ehdr;
01368
01369 olen = pac->pac_opaque_len;
01370 tlv_len = sizeof(*ehdr) + olen;
01371 tlv = os_malloc(tlv_len);
01372 if (tlv) {
01373 ehdr = (struct eap_tlv_hdr *) tlv;
01374 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
01375 ehdr->length = host_to_be16(olen);
01376 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
01377 }
01378 if (tlv == NULL ||
01379 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
01380 TLS_EXT_PAC_OPAQUE,
01381 tlv, tlv_len) < 0) {
01382 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
01383 "extension");
01384 os_free(tlv);
01385 return -1;
01386 }
01387 os_free(tlv);
01388
01389 return 0;
01390 }
01391
01392
01393 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
01394 struct eap_fast_data *data)
01395 {
01396 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
01397 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
01398 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
01399 "TLS extension");
01400 return -1;
01401 }
01402 return 0;
01403 }
01404
01405
01406 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
01407 struct eap_fast_data *data)
01408 {
01409 u8 ciphers[5];
01410 int count = 0;
01411
01412 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
01413 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
01414 "provisioning TLS cipher suites");
01415 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
01416 }
01417
01418 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
01419 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
01420 "provisioning TLS cipher suites");
01421 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
01422 ciphers[count++] = TLS_CIPHER_AES128_SHA;
01423 ciphers[count++] = TLS_CIPHER_RC4_SHA;
01424 }
01425
01426 ciphers[count++] = TLS_CIPHER_NONE;
01427
01428 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
01429 ciphers)) {
01430 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
01431 "cipher suites for provisioning");
01432 return -1;
01433 }
01434
01435 return 0;
01436 }
01437
01438
01439 static int eap_fast_process_start(struct eap_sm *sm,
01440 struct eap_fast_data *data, u8 flags,
01441 const u8 *pos, size_t left)
01442 {
01443 const u8 *a_id;
01444 size_t a_id_len;
01445
01446
01447 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
01448 flags & EAP_TLS_VERSION_MASK, data->fast_version);
01449 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
01450 data->fast_version = flags & EAP_TLS_VERSION_MASK;
01451 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
01452 data->fast_version);
01453
01454 a_id = eap_fast_get_a_id(pos, left, &a_id_len);
01455 eap_fast_select_pac(data, a_id, a_id_len);
01456
01457 if (data->resuming && data->current_pac) {
01458 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
01459 "do not add PAC-Opaque to TLS ClientHello");
01460 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
01461 return -1;
01462 } else if (data->current_pac) {
01463
01464
01465
01466
01467 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
01468 return -1;
01469 } else {
01470
01471 if (!data->provisioning_allowed) {
01472 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
01473 "provisioning disabled");
01474 return -1;
01475 }
01476 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
01477 "starting provisioning");
01478 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
01479 eap_fast_clear_pac_opaque_ext(sm, data) < 0)
01480 return -1;
01481 data->provisioning = 1;
01482 }
01483
01484 return 0;
01485 }
01486
01487
01488 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
01489 struct eap_method_ret *ret,
01490 const struct wpabuf *reqData)
01491 {
01492 const struct eap_hdr *req;
01493 size_t left;
01494 int res;
01495 u8 flags, id;
01496 struct wpabuf *resp;
01497 const u8 *pos;
01498 struct eap_fast_data *data = priv;
01499
01500 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
01501 reqData, &left, &flags);
01502 if (pos == NULL)
01503 return NULL;
01504
01505 req = wpabuf_head(reqData);
01506 id = req->identifier;
01507
01508 if (flags & EAP_TLS_FLAGS_START) {
01509 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
01510 return NULL;
01511
01512 left = 0;
01513 }
01514
01515 resp = NULL;
01516 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
01517 !data->resuming) {
01518
01519 struct wpabuf msg;
01520 wpabuf_set(&msg, pos, left);
01521 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
01522 if (res < 0) {
01523 ret->methodState = METHOD_DONE;
01524 ret->decision = DECISION_FAIL;
01525
01526
01527
01528
01529 res = 1;
01530 }
01531 } else {
01532
01533 res = eap_peer_tls_process_helper(sm, &data->ssl,
01534 EAP_TYPE_FAST,
01535 data->fast_version, id, pos,
01536 left, &resp);
01537
01538 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
01539 char cipher[80];
01540 wpa_printf(MSG_DEBUG,
01541 "EAP-FAST: TLS done, proceed to Phase 2");
01542 if (data->provisioning &&
01543 (!(data->provisioning_allowed &
01544 EAP_FAST_PROV_AUTH) ||
01545 tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
01546 cipher, sizeof(cipher)) < 0 ||
01547 os_strstr(cipher, "ADH-") ||
01548 os_strstr(cipher, "anon"))) {
01549 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
01550 "anonymous (unauthenticated) "
01551 "provisioning");
01552 data->anon_provisioning = 1;
01553 } else
01554 data->anon_provisioning = 0;
01555 data->resuming = 0;
01556 eap_fast_derive_keys(sm, data);
01557 }
01558
01559 if (res == 2) {
01560 struct wpabuf msg;
01561
01562
01563
01564 wpabuf_free(data->pending_phase2_req);
01565 data->pending_phase2_req = resp;
01566 resp = NULL;
01567 wpabuf_set(&msg, pos, left);
01568 res = eap_fast_decrypt(sm, data, ret, req, &msg,
01569 &resp);
01570 }
01571 }
01572
01573 if (res == 1) {
01574 wpabuf_free(resp);
01575 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
01576 data->fast_version);
01577 }
01578
01579 return resp;
01580 }
01581
01582
01583 #if 0
01584 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
01585 {
01586 struct eap_fast_data *data = priv;
01587 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
01588 }
01589
01590
01591 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
01592 {
01593 struct eap_fast_data *data = priv;
01594 os_free(data->key_block_p);
01595 data->key_block_p = NULL;
01596 wpabuf_free(data->pending_phase2_req);
01597 data->pending_phase2_req = NULL;
01598 }
01599
01600
01601 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
01602 {
01603 struct eap_fast_data *data = priv;
01604 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
01605 os_free(data);
01606 return NULL;
01607 }
01608 if (data->phase2_priv && data->phase2_method &&
01609 data->phase2_method->init_for_reauth)
01610 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
01611 data->phase2_success = 0;
01612 data->resuming = 1;
01613 data->provisioning = 0;
01614 data->anon_provisioning = 0;
01615 data->simck_idx = 0;
01616 return priv;
01617 }
01618 #endif
01619
01620
01621 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
01622 size_t buflen, int verbose)
01623 {
01624 struct eap_fast_data *data = priv;
01625 int len, ret;
01626
01627 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
01628 if (data->phase2_method) {
01629 ret = os_snprintf(buf + len, buflen - len,
01630 "EAP-FAST Phase2 method=%s\n",
01631 data->phase2_method->name);
01632 if (ret < 0 || (size_t) ret >= buflen - len)
01633 return len;
01634 len += ret;
01635 }
01636 return len;
01637 }
01638
01639
01640 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
01641 {
01642 struct eap_fast_data *data = priv;
01643 return data->success;
01644 }
01645
01646
01647 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
01648 {
01649 struct eap_fast_data *data = priv;
01650 u8 *key;
01651
01652 if (!data->success)
01653 return NULL;
01654
01655 key = os_malloc(EAP_FAST_KEY_LEN);
01656 if (key == NULL)
01657 return NULL;
01658
01659 *len = EAP_FAST_KEY_LEN;
01660 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
01661
01662 return key;
01663 }
01664
01665
01666 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
01667 {
01668 struct eap_fast_data *data = priv;
01669 u8 *key;
01670
01671 if (!data->success)
01672 return NULL;
01673
01674 key = os_malloc(EAP_EMSK_LEN);
01675 if (key == NULL)
01676 return NULL;
01677
01678 *len = EAP_EMSK_LEN;
01679 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
01680
01681 return key;
01682 }
01683
01684
01685 int eap_peer_fast_register(void)
01686 {
01687 struct eap_method *eap;
01688 int ret;
01689
01690 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
01691 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
01692 if (eap == NULL)
01693 return -1;
01694
01695 eap->init = eap_fast_init;
01696 eap->deinit = eap_fast_deinit;
01697 eap->process = eap_fast_process;
01698 eap->isKeyAvailable = eap_fast_isKeyAvailable;
01699 eap->getKey = eap_fast_getKey;
01700 eap->get_status = eap_fast_get_status;
01701 #if 0
01702 eap->has_reauth_data = eap_fast_has_reauth_data;
01703 eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
01704 eap->init_for_reauth = eap_fast_init_for_reauth;
01705 #endif
01706 eap->get_emsk = eap_fast_get_emsk;
01707
01708 ret = eap_peer_method_register(eap);
01709 if (ret)
01710 eap_peer_method_free(eap);
01711 return ret;
01712 }