contrib/wpa/src/eap_peer/eap_fast.c

   1 /*
   2  * EAP peer method: EAP-FAST (RFC 4851)
   3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/tls.h"
  13 #include "crypto/sha1.h"
  14 #include "eap_common/eap_tlv_common.h"
  15 #include "eap_i.h"
  16 #include "eap_tls_common.h"
  17 #include "eap_config.h"
  18 #include "eap_fast_pac.h"
  19
  20 #ifdef EAP_FAST_DYNAMIC
  21 #include "eap_fast_pac.c"
  22 #endif /* EAP_FAST_DYNAMIC */
  23
  24 /* TODO:
  25  * - test session resumption and enable it if it interoperates
  26  * - password change (pending mschapv2 packet; replay decrypted packet)
  27  */
  28
  29
  30 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
  31
  32
  33 struct eap_fast_data {
  34         struct eap_ssl_data ssl;
  35
  36         int fast_version;
  37
  38         const struct eap_method *phase2_method;
  39         void *phase2_priv;
  40         int phase2_success;
  41
  42         struct eap_method_type phase2_type;
  43         struct eap_method_type *phase2_types;
  44         size_t num_phase2_types;
  45         int resuming; /* starting a resumed session */
  46         struct eap_fast_key_block_provisioning *key_block_p;
  47 #define EAP_FAST_PROV_UNAUTH 1
  48 #define EAP_FAST_PROV_AUTH 2
  49         int provisioning_allowed; /* Allowed PAC provisioning modes */
  50         int provisioning; /* doing PAC provisioning (not the normal auth) */
  51         int anon_provisioning; /* doing anonymous (unauthenticated)
  52                                 * provisioning */
  53         int session_ticket_used;
  54
  55         u8 key_data[EAP_FAST_KEY_LEN];
  56         u8 emsk[EAP_EMSK_LEN];
  57         int success;
  58
  59         struct eap_fast_pac *pac;
  60         struct eap_fast_pac *current_pac;
  61         size_t max_pac_list_len;
  62         int use_pac_binary_format;
  63
  64         u8 simck[EAP_FAST_SIMCK_LEN];
  65         int simck_idx;
  66
  67         struct wpabuf *pending_phase2_req;
  68 };
  69
  70
  71 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
  72                                       const u8 *client_random,
  73                                       const u8 *server_random,
  74                                       u8 *master_secret)
  75 {
  76         struct eap_fast_data *data = ctx;
  77
  78         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
  79
  80         if (client_random == NULL || server_random == NULL ||
  81             master_secret == NULL) {
  82                 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
  83                            "back to full TLS handshake");
  84                 data->session_ticket_used = 0;
  85                 if (data->provisioning_allowed) {
  86                         wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
  87                                    "new PAC-Key");
  88                         data->provisioning = 1;
  89                         data->current_pac = NULL;
  90                 }
  91                 return 0;
  92         }
  93
  94         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
  95
  96         if (data->current_pac == NULL) {
  97                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
  98                            "using SessionTicket");
  99                 data->session_ticket_used = 0;
 100                 return 0;
 101         }
 102
 103         eap_fast_derive_master_secret(data->current_pac->pac_key,
 104                                       server_random, client_random,
 105                                       master_secret);
 106
 107         data->session_ticket_used = 1;
 108
 109         return 1;
 110 }
 111
 112
 113 static int eap_fast_parse_phase1(struct eap_fast_data *data,
 114                                  const char *phase1)
 115 {
 116         const char *pos;
 117
 118         pos = os_strstr(phase1, "fast_provisioning=");
 119         if (pos) {
 120                 data->provisioning_allowed = atoi(pos + 18);
 121                 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
 122                            "mode: %d", data->provisioning_allowed);
 123         }
 124
 125         pos = os_strstr(phase1, "fast_max_pac_list_len=");
 126         if (pos) {
 127                 data->max_pac_list_len = atoi(pos + 22);
 128                 if (data->max_pac_list_len == 0)
 129                         data->max_pac_list_len = 1;
 130                 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
 131                            (unsigned long) data->max_pac_list_len);
 132         }
 133
 134         pos = os_strstr(phase1, "fast_pac_format=binary");
 135         if (pos) {
 136                 data->use_pac_binary_format = 1;
 137                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
 138                            "list");
 139         }
 140
 141         return 0;
 142 }
 143
 144
 145 static void * eap_fast_init(struct eap_sm *sm)
 146 {
 147         struct eap_fast_data *data;
 148         struct eap_peer_config *config = eap_get_config(sm);
 149
 150         data = os_zalloc(sizeof(*data));
 151         if (data == NULL)
 152                 return NULL;
 153         data->fast_version = EAP_FAST_VERSION;
 154         data->max_pac_list_len = 10;
 155
 156         if (config && config->phase1 &&
 157             eap_fast_parse_phase1(data, config->phase1) < 0) {
 158                 eap_fast_deinit(sm, data);
 159                 return NULL;
 160         }
 161
 162         if (eap_peer_select_phase2_methods(config, "auth=",
 163                                            &data->phase2_types,
 164                                            &data->num_phase2_types) < 0) {
 165                 eap_fast_deinit(sm, data);
 166                 return NULL;
 167         }
 168
 169         data->phase2_type.vendor = EAP_VENDOR_IETF;
 170         data->phase2_type.method = EAP_TYPE_NONE;
 171
 172         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
 173                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 174                 eap_fast_deinit(sm, data);
 175                 return NULL;
 176         }
 177
 178         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 179                                                  eap_fast_session_ticket_cb,
 180                                                  data) < 0) {
 181                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 182                            "callback");
 183                 eap_fast_deinit(sm, data);
 184                 return NULL;
 185         }
 186
 187         /*
 188          * The local RADIUS server in a Cisco AP does not seem to like empty
 189          * fragments before data, so disable that workaround for CBC.
 190          * TODO: consider making this configurable
 191          */
 192         if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
 193                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
 194                            "workarounds");
 195         }
 196
 197         if (data->use_pac_binary_format &&
 198             eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
 199                 eap_fast_deinit(sm, data);
 200                 return NULL;
 201         }
 202
 203         if (!data->use_pac_binary_format &&
 204             eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
 205                 eap_fast_deinit(sm, data);
 206                 return NULL;
 207         }
 208         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
 209
 210         if (data->pac == NULL && !data->provisioning_allowed) {
 211                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
 212                            "provisioning disabled");
 213                 eap_fast_deinit(sm, data);
 214                 return NULL;
 215         }
 216
 217         return data;
 218 }
 219
 220
 221 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
 222 {
 223         struct eap_fast_data *data = priv;
 224         struct eap_fast_pac *pac, *prev;
 225
 226         if (data == NULL)
 227                 return;
 228         if (data->phase2_priv && data->phase2_method)
 229                 data->phase2_method->deinit(sm, data->phase2_priv);
 230         os_free(data->phase2_types);
 231         os_free(data->key_block_p);
 232         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 233
 234         pac = data->pac;
 235         prev = NULL;
 236         while (pac) {
 237                 prev = pac;
 238                 pac = pac->next;
 239                 eap_fast_free_pac(prev);
 240         }
 241         wpabuf_free(data->pending_phase2_req);
 242         os_free(data);
 243 }
 244
 245
 246 static int eap_fast_derive_msk(struct eap_fast_data *data)
 247 {
 248         eap_fast_derive_eap_msk(data->simck, data->key_data);
 249         eap_fast_derive_eap_emsk(data->simck, data->emsk);
 250         data->success = 1;
 251         return 0;
 252 }
 253
 254
 255 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 256                                      struct eap_fast_data *data)
 257 {
 258         u8 *sks;
 259
 260         /* RFC 4851, Section 5.1:
 261          * Extra key material after TLS key_block: session_key_seed[40]
 262          */
 263
 264         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 265                                   EAP_FAST_SKS_LEN);
 266         if (sks == NULL) {
 267                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 268                            "session_key_seed");
 269                 return;
 270         }
 271
 272         /*
 273          * RFC 4851, Section 5.2:
 274          * S-IMCK[0] = session_key_seed
 275          */
 276         wpa_hexdump_key(MSG_DEBUG,
 277                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 278                         sks, EAP_FAST_SKS_LEN);
 279         data->simck_idx = 0;
 280         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 281         os_free(sks);
 282 }
 283
 284
 285 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 286                                              struct eap_fast_data *data)
 287 {
 288         os_free(data->key_block_p);
 289         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 290                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 291                                     "key expansion",
 292                                     sizeof(*data->key_block_p));
 293         if (data->key_block_p == NULL) {
 294                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 295                 return;
 296         }
 297         /*
 298          * RFC 4851, Section 5.2:
 299          * S-IMCK[0] = session_key_seed
 300          */
 301         wpa_hexdump_key(MSG_DEBUG,
 302                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 303                         data->key_block_p->session_key_seed,
 304                         sizeof(data->key_block_p->session_key_seed));
 305         data->simck_idx = 0;
 306         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 307                   EAP_FAST_SIMCK_LEN);
 308         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 309                         data->key_block_p->server_challenge,
 310                         sizeof(data->key_block_p->server_challenge));
 311         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 312                         data->key_block_p->client_challenge,
 313                         sizeof(data->key_block_p->client_challenge));
 314 }
 315
 316
 317 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
 318 {
 319         if (data->anon_provisioning)
 320                 eap_fast_derive_key_provisioning(sm, data);
 321         else
 322                 eap_fast_derive_key_auth(sm, data);
 323 }
 324
 325
 326 static int eap_fast_init_phase2_method(struct eap_sm *sm,
 327                                        struct eap_fast_data *data)
 328 {
 329         data->phase2_method =
 330                 eap_peer_get_eap_method(data->phase2_type.vendor,
 331                                         data->phase2_type.method);
 332         if (data->phase2_method == NULL)
 333                 return -1;
 334
 335         if (data->key_block_p) {
 336                 sm->auth_challenge = data->key_block_p->server_challenge;
 337                 sm->peer_challenge = data->key_block_p->client_challenge;
 338         }
 339         sm->init_phase2 = 1;
 340         data->phase2_priv = data->phase2_method->init(sm);
 341         sm->init_phase2 = 0;
 342         sm->auth_challenge = NULL;
 343         sm->peer_challenge = NULL;
 344
 345         return data->phase2_priv == NULL ? -1 : 0;
 346 }
 347
 348
 349 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
 350 {
 351         size_t i;
 352
 353         /* TODO: TNC with anonymous provisioning; need to require both
 354          * completed MSCHAPv2 and TNC */
 355
 356         if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
 357                 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
 358                            "during unauthenticated provisioning; reject phase2"
 359                            " type %d", type);
 360                 return -1;
 361         }
 362
 363 #ifdef EAP_TNC
 364         if (type == EAP_TYPE_TNC) {
 365                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 366                 data->phase2_type.method = EAP_TYPE_TNC;
 367                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 368                            "vendor %d method %d for TNC",
 369                            data->phase2_type.vendor,
 370                            data->phase2_type.method);
 371                 return 0;
 372         }
 373 #endif /* EAP_TNC */
 374
 375         for (i = 0; i < data->num_phase2_types; i++) {
 376                 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
 377                     data->phase2_types[i].method != type)
 378                         continue;
 379
 380                 data->phase2_type.vendor = data->phase2_types[i].vendor;
 381                 data->phase2_type.method = data->phase2_types[i].method;
 382                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 383                            "vendor %d method %d",
 384                            data->phase2_type.vendor,
 385                            data->phase2_type.method);
 386                 break;
 387         }
 388
 389         if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
 390                 return -1;
 391
 392         return 0;
 393 }
 394
 395
 396 static int eap_fast_phase2_request(struct eap_sm *sm,
 397                                    struct eap_fast_data *data,
 398                                    struct eap_method_ret *ret,
 399                                    struct eap_hdr *hdr,
 400                                    struct wpabuf **resp)
 401 {
 402         size_t len = be_to_host16(hdr->length);
 403         u8 *pos;
 404         struct eap_method_ret iret;
 405         struct eap_peer_config *config = eap_get_config(sm);
 406         struct wpabuf msg;
 407
 408         if (len <= sizeof(struct eap_hdr)) {
 409                 wpa_printf(MSG_INFO, "EAP-FAST: too short "
 410                            "Phase 2 request (len=%lu)", (unsigned long) len);
 411                 return -1;
 412         }
 413         pos = (u8 *) (hdr + 1);
 414         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
 415         if (*pos == EAP_TYPE_IDENTITY) {
 416                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 417                 return 0;
 418         }
 419
 420         if (data->phase2_priv && data->phase2_method &&
 421             *pos != data->phase2_type.method) {
 422                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
 423                            "deinitialize previous method");
 424                 data->phase2_method->deinit(sm, data->phase2_priv);
 425                 data->phase2_method = NULL;
 426                 data->phase2_priv = NULL;
 427                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 428                 data->phase2_type.method = EAP_TYPE_NONE;
 429         }
 430
 431         if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 432             data->phase2_type.method == EAP_TYPE_NONE &&
 433             eap_fast_select_phase2_method(data, *pos) < 0) {
 434                 if (eap_peer_tls_phase2_nak(data->phase2_types,
 435                                             data->num_phase2_types,
 436                                             hdr, resp))
 437                         return -1;
 438                 return 0;
 439         }
 440
 441         if ((data->phase2_priv == NULL &&
 442              eap_fast_init_phase2_method(sm, data) < 0) ||
 443             data->phase2_method == NULL) {
 444                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
 445                            "Phase 2 EAP method %d", *pos);
 446                 ret->methodState = METHOD_DONE;
 447                 ret->decision = DECISION_FAIL;
 448                 return -1;
 449         }
 450
 451         os_memset(&iret, 0, sizeof(iret));
 452         wpabuf_set(&msg, hdr, len);
 453         *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
 454                                              &msg);
 455         if (*resp == NULL ||
 456             (iret.methodState == METHOD_DONE &&
 457              iret.decision == DECISION_FAIL)) {
 458                 ret->methodState = METHOD_DONE;
 459                 ret->decision = DECISION_FAIL;
 460         } else if ((iret.methodState == METHOD_DONE ||
 461                     iret.methodState == METHOD_MAY_CONT) &&
 462                    (iret.decision == DECISION_UNCOND_SUCC ||
 463                     iret.decision == DECISION_COND_SUCC)) {
 464                 data->phase2_success = 1;
 465         }
 466
 467         if (*resp == NULL && config &&
 468             (config->pending_req_identity || config->pending_req_password ||
 469              config->pending_req_otp || config->pending_req_new_password)) {
 470                 wpabuf_free(data->pending_phase2_req);
 471                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 472         } else if (*resp == NULL)
 473                 return -1;
 474
 475         return 0;
 476 }
 477
 478
 479 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
 480 {
 481         struct wpabuf *buf;
 482         struct eap_tlv_nak_tlv *nak;
 483         buf = wpabuf_alloc(sizeof(*nak));
 484         if (buf == NULL)
 485                 return NULL;
 486         nak = wpabuf_put(buf, sizeof(*nak));
 487         nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
 488         nak->length = host_to_be16(6);
 489         nak->vendor_id = host_to_be32(vendor_id);
 490         nak->nak_type = host_to_be16(tlv_type);
 491         return buf;
 492 }
 493
 494
 495 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
 496 {
 497         struct wpabuf *buf;
 498         struct eap_tlv_intermediate_result_tlv *result;
 499         buf = wpabuf_alloc(sizeof(*result));
 500         if (buf == NULL)
 501                 return NULL;
 502         wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
 503                    intermediate ? "Intermediate " : "", status);
 504         result = wpabuf_put(buf, sizeof(*result));
 505         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 506                                         (intermediate ?
 507                                          EAP_TLV_INTERMEDIATE_RESULT_TLV :
 508                                          EAP_TLV_RESULT_TLV));
 509         result->length = host_to_be16(2);
 510         result->status = host_to_be16(status);
 511         return buf;
 512 }
 513
 514
 515 static struct wpabuf * eap_fast_tlv_pac_ack(void)
 516 {
 517         struct wpabuf *buf;
 518         struct eap_tlv_result_tlv *res;
 519         struct eap_tlv_pac_ack_tlv *ack;
 520
 521         buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
 522         if (buf == NULL)
 523                 return NULL;
 524
 525         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
 526         ack = wpabuf_put(buf, sizeof(*ack));
 527         ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
 528                                      EAP_TLV_TYPE_MANDATORY);
 529         ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
 530         ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
 531         ack->pac_len = host_to_be16(2);
 532         ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 533
 534         return buf;
 535 }
 536
 537
 538 static struct wpabuf * eap_fast_process_eap_payload_tlv(
 539         struct eap_sm *sm, struct eap_fast_data *data,
 540         struct eap_method_ret *ret,
 541         u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
 542 {
 543         struct eap_hdr *hdr;
 544         struct wpabuf *resp = NULL;
 545
 546         if (eap_payload_tlv_len < sizeof(*hdr)) {
 547                 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
 548                            "Payload TLV (len=%lu)",
 549                            (unsigned long) eap_payload_tlv_len);
 550                 return NULL;
 551         }
 552
 553         hdr = (struct eap_hdr *) eap_payload_tlv;
 554         if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
 555                 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
 556                            "EAP Payload TLV");
 557                 return NULL;
 558         }
 559
 560         if (hdr->code != EAP_CODE_REQUEST) {
 561                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
 562                            "Phase 2 EAP header", hdr->code);
 563                 return NULL;
 564         }
 565
 566         if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
 567                 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
 568                            "failed");
 569                 return NULL;
 570         }
 571
 572         return eap_fast_tlv_eap_payload(resp);
 573 }
 574
 575
 576 static int eap_fast_validate_crypto_binding(
 577         struct eap_tlv_crypto_binding_tlv *_bind)
 578 {
 579         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
 580                    "Received Version %d SubType %d",
 581                    _bind->version, _bind->received_version, _bind->subtype);
 582         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 583                     _bind->nonce, sizeof(_bind->nonce));
 584         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 585                     _bind->compound_mac, sizeof(_bind->compound_mac));
 586
 587         if (_bind->version != EAP_FAST_VERSION ||
 588             _bind->received_version != EAP_FAST_VERSION ||
 589             _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
 590                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
 591                            "Crypto-Binding TLV: Version %d "
 592                            "Received Version %d SubType %d",
 593                            _bind->version, _bind->received_version,
 594                            _bind->subtype);
 595                 return -1;
 596         }
 597
 598         return 0;
 599 }
 600
 601
 602 static void eap_fast_write_crypto_binding(
 603         struct eap_tlv_crypto_binding_tlv *rbind,
 604         struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
 605 {
 606         rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 607                                        EAP_TLV_CRYPTO_BINDING_TLV);
 608         rbind->length = host_to_be16(sizeof(*rbind) -
 609                                      sizeof(struct eap_tlv_hdr));
 610         rbind->version = EAP_FAST_VERSION;
 611         rbind->received_version = _bind->version;
 612         rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
 613         os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
 614         inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
 615         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
 616                   rbind->compound_mac);
 617
 618         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
 619                    "Received Version %d SubType %d",
 620                    rbind->version, rbind->received_version, rbind->subtype);
 621         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 622                     rbind->nonce, sizeof(rbind->nonce));
 623         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 624                     rbind->compound_mac, sizeof(rbind->compound_mac));
 625 }
 626
 627
 628 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 629                                    struct eap_fast_data *data,
 630                                    u8 *isk, size_t isk_len)
 631 {
 632         u8 *key;
 633         size_t key_len;
 634
 635         os_memset(isk, 0, isk_len);
 636
 637         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 638                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 639                            "available");
 640                 return -1;
 641         }
 642
 643         if (data->phase2_method->isKeyAvailable == NULL ||
 644             data->phase2_method->getKey == NULL)
 645                 return 0;
 646
 647         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 648             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 649                                                &key_len)) == NULL) {
 650                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 651                            "from Phase 2");
 652                 return -1;
 653         }
 654
 655         if (key_len > isk_len)
 656                 key_len = isk_len;
 657         if (key_len == 32 &&
 658             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 659             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 660                 /*
 661                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 662                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 663                  * ISK for EAP-FAST cryptobinding.
 664                  */
 665                 os_memcpy(isk, key + 16, 16);
 666                 os_memcpy(isk + 16, key, 16);
 667         } else
 668                 os_memcpy(isk, key, key_len);
 669         os_free(key);
 670
 671         return 0;
 672 }
 673
 674
 675 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
 676                             u8 *cmk)
 677 {
 678         u8 isk[32], imck[60];
 679
 680         wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
 681                    "calculation", data->simck_idx + 1);
 682
 683         /*
 684          * RFC 4851, Section 5.2:
 685          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 686          *                 MSK[j], 60)
 687          * S-IMCK[j] = first 40 octets of IMCK[j]
 688          * CMK[j] = last 20 octets of IMCK[j]
 689          */
 690
 691         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 692                 return -1;
 693         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 694         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 695                    "Inner Methods Compound Keys",
 696                    isk, sizeof(isk), imck, sizeof(imck));
 697         data->simck_idx++;
 698         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 699         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 700                         data->simck, EAP_FAST_SIMCK_LEN);
 701         os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 702         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 703                         cmk, EAP_FAST_CMK_LEN);
 704
 705         return 0;
 706 }
 707
 708
 709 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
 710 {
 711         struct eap_tlv_hdr *pac;
 712         struct eap_tlv_request_action_tlv *act;
 713         struct eap_tlv_pac_type_tlv *type;
 714
 715         act = (struct eap_tlv_request_action_tlv *) pos;
 716         act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
 717         act->length = host_to_be16(2);
 718         act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
 719
 720         pac = (struct eap_tlv_hdr *) (act + 1);
 721         pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
 722         pac->length = host_to_be16(sizeof(*type));
 723
 724         type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
 725         type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
 726         type->length = host_to_be16(2);
 727         type->pac_type = host_to_be16(pac_type);
 728
 729         return (u8 *) (type + 1);
 730 }
 731
 732
 733 static struct wpabuf * eap_fast_process_crypto_binding(
 734         struct eap_sm *sm, struct eap_fast_data *data,
 735         struct eap_method_ret *ret,
 736         struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
 737 {
 738         struct wpabuf *resp;
 739         u8 *pos;
 740         u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
 741         int res;
 742         size_t len;
 743
 744         if (eap_fast_validate_crypto_binding(_bind) < 0)
 745                 return NULL;
 746
 747         if (eap_fast_get_cmk(sm, data, cmk) < 0)
 748                 return NULL;
 749
 750         /* Validate received Compound MAC */
 751         os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
 752         os_memset(_bind->compound_mac, 0, sizeof(cmac));
 753         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
 754                     "MAC calculation", (u8 *) _bind, bind_len);
 755         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
 756                   _bind->compound_mac);
 757         res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
 758         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
 759                     cmac, sizeof(cmac));
 760         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
 761                     _bind->compound_mac, sizeof(cmac));
 762         if (res != 0) {
 763                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
 764                 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
 765                 return NULL;
 766         }
 767
 768         /*
 769          * Compound MAC was valid, so authentication succeeded. Reply with
 770          * crypto binding to allow server to complete authentication.
 771          */
 772
 773         len = sizeof(struct eap_tlv_crypto_binding_tlv);
 774         resp = wpabuf_alloc(len);
 775         if (resp == NULL)
 776                 return NULL;
 777
 778         if (!data->anon_provisioning && data->phase2_success &&
 779             eap_fast_derive_msk(data) < 0) {
 780                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
 781                 ret->methodState = METHOD_DONE;
 782                 ret->decision = DECISION_FAIL;
 783                 data->phase2_success = 0;
 784                 wpabuf_free(resp);
 785                 return NULL;
 786         }
 787
 788         pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
 789         eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
 790                                       pos, _bind, cmk);
 791
 792         return resp;
 793 }
 794
 795
 796 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
 797                                    u8 *pos, size_t len, int *pac_key_found)
 798 {
 799         switch (type & 0x7fff) {
 800         case PAC_TYPE_PAC_KEY:
 801                 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
 802                 if (len != EAP_FAST_PAC_KEY_LEN) {
 803                         wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
 804                                    "length %lu", (unsigned long) len);
 805                         break;
 806                 }
 807                 *pac_key_found = 1;
 808                 os_memcpy(entry->pac_key, pos, len);
 809                 break;
 810         case PAC_TYPE_PAC_OPAQUE:
 811                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
 812                 entry->pac_opaque = pos;
 813                 entry->pac_opaque_len = len;
 814                 break;
 815         case PAC_TYPE_PAC_INFO:
 816                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
 817                 entry->pac_info = pos;
 818                 entry->pac_info_len = len;
 819                 break;
 820         default:
 821                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
 822                            type);
 823                 break;
 824         }
 825 }
 826
 827
 828 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
 829                                     u8 *pac, size_t pac_len)
 830 {
 831         struct pac_tlv_hdr *hdr;
 832         u8 *pos;
 833         size_t left, len;
 834         int type, pac_key_found = 0;
 835
 836         pos = pac;
 837         left = pac_len;
 838
 839         while (left > sizeof(*hdr)) {
 840                 hdr = (struct pac_tlv_hdr *) pos;
 841                 type = be_to_host16(hdr->type);
 842                 len = be_to_host16(hdr->len);
 843                 pos += sizeof(*hdr);
 844                 left -= sizeof(*hdr);
 845                 if (len > left) {
 846                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
 847                                    "(type=%d len=%lu left=%lu)",
 848                                    type, (unsigned long) len,
 849                                    (unsigned long) left);
 850                         return -1;
 851                 }
 852
 853                 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
 854
 855                 pos += len;
 856                 left -= len;
 857         }
 858
 859         if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
 860                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
 861                            "all the required fields");
 862                 return -1;
 863         }
 864
 865         return 0;
 866 }
 867
 868
 869 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
 870                                    u8 *pos, size_t len)
 871 {
 872         u16 pac_type;
 873         u32 lifetime;
 874         struct os_time now;
 875
 876         switch (type & 0x7fff) {
 877         case PAC_TYPE_CRED_LIFETIME:
 878                 if (len != 4) {
 879                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
 880                                     "Invalid CRED_LIFETIME length - ignored",
 881                                     pos, len);
 882                         return 0;
 883                 }
 884
 885                 /*
 886                  * This is not currently saved separately in PAC files since
 887                  * the server can automatically initiate PAC update when
 888                  * needed. Anyway, the information is available from PAC-Info
 889                  * dump if it is needed for something in the future.
 890                  */
 891                 lifetime = WPA_GET_BE32(pos);
 892                 os_get_time(&now);
 893                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
 894                            "(%d days)",
 895                            lifetime, (lifetime - (u32) now.sec) / 86400);
 896                 break;
 897         case PAC_TYPE_A_ID:
 898                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
 899                                   pos, len);
 900                 entry->a_id = pos;
 901                 entry->a_id_len = len;
 902                 break;
 903         case PAC_TYPE_I_ID:
 904                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
 905                                   pos, len);
 906                 entry->i_id = pos;
 907                 entry->i_id_len = len;
 908                 break;
 909         case PAC_TYPE_A_ID_INFO:
 910                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
 911                                   pos, len);
 912                 entry->a_id_info = pos;
 913                 entry->a_id_info_len = len;
 914                 break;
 915         case PAC_TYPE_PAC_TYPE:
 916                 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
 917                 if (len != 2) {
 918                         wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
 919                                    "length %lu (expected 2)",
 920                                    (unsigned long) len);
 921                         wpa_hexdump_ascii(MSG_DEBUG,
 922                                           "EAP-FAST: PAC-Info - PAC-Type",
 923                                           pos, len);
 924                         return -1;
 925                 }
 926                 pac_type = WPA_GET_BE16(pos);
 927                 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
 928                     pac_type != PAC_TYPE_USER_AUTHORIZATION &&
 929                     pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
 930                         wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
 931                                    "%d", pac_type);
 932                         return -1;
 933                 }
 934
 935                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
 936                            pac_type);
 937                 entry->pac_type = pac_type;
 938                 break;
 939         default:
 940                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
 941                            "type %d", type);
 942                 break;
 943         }
 944
 945         return 0;
 946 }
 947
 948
 949 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
 950 {
 951         struct pac_tlv_hdr *hdr;
 952         u8 *pos;
 953         size_t left, len;
 954         int type;
 955
 956         /* RFC 5422, Section 4.2.4 */
 957
 958         /* PAC-Type defaults to Tunnel PAC (Type 1) */
 959         entry->pac_type = PAC_TYPE_TUNNEL_PAC;
 960
 961         pos = entry->pac_info;
 962         left = entry->pac_info_len;
 963         while (left > sizeof(*hdr)) {
 964                 hdr = (struct pac_tlv_hdr *) pos;
 965                 type = be_to_host16(hdr->type);
 966                 len = be_to_host16(hdr->len);
 967                 pos += sizeof(*hdr);
 968                 left -= sizeof(*hdr);
 969                 if (len > left) {
 970                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
 971                                    "(type=%d len=%lu left=%lu)",
 972                                    type, (unsigned long) len,
 973                                    (unsigned long) left);
 974                         return -1;
 975                 }
 976
 977                 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
 978                         return -1;
 979
 980                 pos += len;
 981                 left -= len;
 982         }
 983
 984         if (entry->a_id == NULL || entry->a_id_info == NULL) {
 985                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
 986                            "all the required fields");
 987                 return -1;
 988         }
 989
 990         return 0;
 991 }
 992
 993
 994 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
 995                                             struct eap_fast_data *data,
 996                                             struct eap_method_ret *ret,
 997                                             u8 *pac, size_t pac_len)
 998 {
 999         struct eap_peer_config *config = eap_get_config(sm);
1000         struct eap_fast_pac entry;
1001
1002         os_memset(&entry, 0, sizeof(entry));
1003         if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1004             eap_fast_process_pac_info(&entry))
1005                 return NULL;
1006
1007         eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1008         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1009         if (data->use_pac_binary_format)
1010                 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1011         else
1012                 eap_fast_save_pac(sm, data->pac, config->pac_file);
1013
1014         if (data->provisioning) {
1015                 if (data->anon_provisioning) {
1016                         /*
1017                          * Unauthenticated provisioning does not provide keying
1018                          * material and must end with an EAP-Failure.
1019                          * Authentication will be done separately after this.
1020                          */
1021                         data->success = 0;
1022                         ret->decision = DECISION_FAIL;
1023                 } else {
1024                         /*
1025                          * Server may or may not allow authenticated
1026                          * provisioning also for key generation.
1027                          */
1028                         ret->decision = DECISION_COND_SUCC;
1029                 }
1030                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1031                            "- Provisioning completed successfully");
1032         } else {
1033                 /*
1034                  * This is PAC refreshing, i.e., normal authentication that is
1035                  * expected to be completed with an EAP-Success. However,
1036                  * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1037                  * after protected success exchange in case of EAP-Fast
1038                  * provisioning, so we better use DECISION_COND_SUCC here
1039                  * instead of DECISION_UNCOND_SUCC.
1040                  */
1041                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1042                            "- PAC refreshing completed successfully");
1043                 ret->decision = DECISION_COND_SUCC;
1044         }
1045         ret->methodState = METHOD_DONE;
1046         return eap_fast_tlv_pac_ack();
1047 }
1048
1049
1050 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1051                                     struct eap_fast_tlv_parse *tlv,
1052                                     struct wpabuf **resp)
1053 {
1054         int mandatory, tlv_type, len, res;
1055         u8 *pos, *end;
1056
1057         os_memset(tlv, 0, sizeof(*tlv));
1058
1059         /* Parse TLVs from the decrypted Phase 2 data */
1060         pos = wpabuf_mhead(decrypted);
1061         end = pos + wpabuf_len(decrypted);
1062         while (pos + 4 < end) {
1063                 mandatory = pos[0] & 0x80;
1064                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1065                 pos += 2;
1066                 len = WPA_GET_BE16(pos);
1067                 pos += 2;
1068                 if (pos + len > end) {
1069                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1070                         return -1;
1071                 }
1072                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1073                            "TLV type %d length %d%s",
1074                            tlv_type, len, mandatory ? " (mandatory)" : "");
1075
1076                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1077                 if (res == -2)
1078                         break;
1079                 if (res < 0) {
1080                         if (mandatory) {
1081                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1082                                            "mandatory TLV type %d", tlv_type);
1083                                 *resp = eap_fast_tlv_nak(0, tlv_type);
1084                                 break;
1085                         } else {
1086                                 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1087                                            "unknown optional TLV type %d",
1088                                            tlv_type);
1089                         }
1090                 }
1091
1092                 pos += len;
1093         }
1094
1095         return 0;
1096 }
1097
1098
1099 static int eap_fast_encrypt_response(struct eap_sm *sm,
1100                                      struct eap_fast_data *data,
1101                                      struct wpabuf *resp,
1102                                      u8 identifier, struct wpabuf **out_data)
1103 {
1104         if (resp == NULL)
1105                 return 0;
1106
1107         wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1108                         resp);
1109         if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1110                                  data->fast_version, identifier,
1111                                  resp, out_data)) {
1112                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1113                            "frame");
1114         }
1115         wpabuf_free(resp);
1116
1117         return 0;
1118 }
1119
1120
1121 static struct wpabuf * eap_fast_pac_request(void)
1122 {
1123         struct wpabuf *tmp;
1124         u8 *pos, *pos2;
1125
1126         tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1127                            sizeof(struct eap_tlv_request_action_tlv) +
1128                            sizeof(struct eap_tlv_pac_type_tlv));
1129         if (tmp == NULL)
1130                 return NULL;
1131
1132         pos = wpabuf_put(tmp, 0);
1133         pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1134         wpabuf_put(tmp, pos2 - pos);
1135         return tmp;
1136 }
1137
1138
1139 static int eap_fast_process_decrypted(struct eap_sm *sm,
1140                                       struct eap_fast_data *data,
1141                                       struct eap_method_ret *ret,
1142                                       const struct eap_hdr *req,
1143                                       struct wpabuf *decrypted,
1144                                       struct wpabuf **out_data)
1145 {
1146         struct wpabuf *resp = NULL, *tmp;
1147         struct eap_fast_tlv_parse tlv;
1148         int failed = 0;
1149
1150         if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1151                 return 0;
1152         if (resp)
1153                 return eap_fast_encrypt_response(sm, data, resp,
1154                                                  req->identifier, out_data);
1155
1156         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1157                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1158                 return eap_fast_encrypt_response(sm, data, resp,
1159                                                  req->identifier, out_data);
1160         }
1161
1162         if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1163                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1164                 return eap_fast_encrypt_response(sm, data, resp,
1165                                                  req->identifier, out_data);
1166         }
1167
1168         if (tlv.crypto_binding) {
1169                 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1170                                                       tlv.crypto_binding,
1171                                                       tlv.crypto_binding_len);
1172                 if (tmp == NULL)
1173                         failed = 1;
1174                 else
1175                         resp = wpabuf_concat(resp, tmp);
1176         }
1177
1178         if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1179                 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1180                                           EAP_TLV_RESULT_SUCCESS, 1);
1181                 resp = wpabuf_concat(resp, tmp);
1182         }
1183
1184         if (tlv.eap_payload_tlv) {
1185                 tmp = eap_fast_process_eap_payload_tlv(
1186                         sm, data, ret, tlv.eap_payload_tlv,
1187                         tlv.eap_payload_tlv_len);
1188                 resp = wpabuf_concat(resp, tmp);
1189         }
1190
1191         if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1192                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1193                            "acknowledging success");
1194                 failed = 1;
1195         } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1196                 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1197                                            tlv.pac_len);
1198                 resp = wpabuf_concat(resp, tmp);
1199         }
1200
1201         if (data->current_pac == NULL && data->provisioning &&
1202             !data->anon_provisioning && !tlv.pac &&
1203             (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1204              tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1205                 /*
1206                  * Need to request Tunnel PAC when using authenticated
1207                  * provisioning.
1208                  */
1209                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1210                 tmp = eap_fast_pac_request();
1211                 resp = wpabuf_concat(resp, tmp);
1212         }
1213
1214         if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1215                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1216                 resp = wpabuf_concat(tmp, resp);
1217         } else if (failed) {
1218                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1219                 resp = wpabuf_concat(tmp, resp);
1220         }
1221
1222         if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1223             tlv.crypto_binding && data->phase2_success) {
1224                 if (data->anon_provisioning) {
1225                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1226                                    "provisioning completed successfully.");
1227                         ret->methodState = METHOD_DONE;
1228                         ret->decision = DECISION_FAIL;
1229                 } else {
1230                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1231                                    "completed successfully.");
1232                         if (data->provisioning)
1233                                 ret->methodState = METHOD_MAY_CONT;
1234                         else
1235                                 ret->methodState = METHOD_DONE;
1236                         ret->decision = DECISION_UNCOND_SUCC;
1237                 }
1238         }
1239
1240         if (resp == NULL) {
1241                 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1242                            "empty response packet");
1243                 resp = wpabuf_alloc(1);
1244         }
1245
1246         return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1247                                          out_data);
1248 }
1249
1250
1251 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1252                             struct eap_method_ret *ret,
1253                             const struct eap_hdr *req,
1254                             const struct wpabuf *in_data,
1255                             struct wpabuf **out_data)
1256 {
1257         struct wpabuf *in_decrypted;
1258         int res;
1259
1260         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1261                    " Phase 2", (unsigned long) wpabuf_len(in_data));
1262
1263         if (data->pending_phase2_req) {
1264                 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1265                            "skip decryption and use old data");
1266                 /* Clear TLS reassembly state. */
1267                 eap_peer_tls_reset_input(&data->ssl);
1268
1269                 in_decrypted = data->pending_phase2_req;
1270                 data->pending_phase2_req = NULL;
1271                 goto continue_req;
1272         }
1273
1274         if (wpabuf_len(in_data) == 0) {
1275                 /* Received TLS ACK - requesting more fragments */
1276                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1277                                             data->fast_version,
1278                                             req->identifier, NULL, out_data);
1279         }
1280
1281         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1282         if (res)
1283                 return res;
1284
1285 continue_req:
1286         wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1287                         in_decrypted);
1288
1289         if (wpabuf_len(in_decrypted) < 4) {
1290                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1291                            "TLV frame (len=%lu)",
1292                            (unsigned long) wpabuf_len(in_decrypted));
1293                 wpabuf_free(in_decrypted);
1294                 return -1;
1295         }
1296
1297         res = eap_fast_process_decrypted(sm, data, ret, req,
1298                                          in_decrypted, out_data);
1299
1300         wpabuf_free(in_decrypted);
1301
1302         return res;
1303 }
1304
1305
1306 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1307 {
1308         const u8 *a_id;
1309         struct pac_tlv_hdr *hdr;
1310
1311         /*
1312          * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1313          * supports both raw A-ID and one inside an A-ID TLV.
1314          */
1315         a_id = buf;
1316         *id_len = len;
1317         if (len > sizeof(*hdr)) {
1318                 int tlen;
1319                 hdr = (struct pac_tlv_hdr *) buf;
1320                 tlen = be_to_host16(hdr->len);
1321                 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1322                     sizeof(*hdr) + tlen <= len) {
1323                         wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1324                                    "(Start)");
1325                         a_id = (u8 *) (hdr + 1);
1326                         *id_len = tlen;
1327                 }
1328         }
1329         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1330
1331         return a_id;
1332 }
1333
1334
1335 static void eap_fast_select_pac(struct eap_fast_data *data,
1336                                 const u8 *a_id, size_t a_id_len)
1337 {
1338         data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1339                                              PAC_TYPE_TUNNEL_PAC);
1340         if (data->current_pac == NULL) {
1341                 /*
1342                  * Tunnel PAC was not available for this A-ID. Try to use
1343                  * Machine Authentication PAC, if one is available.
1344                  */
1345                 data->current_pac = eap_fast_get_pac(
1346                         data->pac, a_id, a_id_len,
1347                         PAC_TYPE_MACHINE_AUTHENTICATION);
1348         }
1349
1350         if (data->current_pac) {
1351                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1352                            "(PAC-Type %d)", data->current_pac->pac_type);
1353                 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1354                                   data->current_pac->a_id_info,
1355                                   data->current_pac->a_id_info_len);
1356         }
1357 }
1358
1359
1360 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1361                                    struct eap_fast_data *data,
1362                                    struct eap_fast_pac *pac)
1363 {
1364         u8 *tlv;
1365         size_t tlv_len, olen;
1366         struct eap_tlv_hdr *ehdr;
1367
1368         olen = pac->pac_opaque_len;
1369         tlv_len = sizeof(*ehdr) + olen;
1370         tlv = os_malloc(tlv_len);
1371         if (tlv) {
1372                 ehdr = (struct eap_tlv_hdr *) tlv;
1373                 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1374                 ehdr->length = host_to_be16(olen);
1375                 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1376         }
1377         if (tlv == NULL ||
1378             tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1379                                             TLS_EXT_PAC_OPAQUE,
1380                                             tlv, tlv_len) < 0) {
1381                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1382                            "extension");
1383                 os_free(tlv);
1384                 return -1;
1385         }
1386         os_free(tlv);
1387
1388         return 0;
1389 }
1390
1391
1392 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1393                                          struct eap_fast_data *data)
1394 {
1395         if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1396                                             TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1397                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1398                            "TLS extension");
1399                 return -1;
1400         }
1401         return 0;
1402 }
1403
1404
1405 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1406                                              struct eap_fast_data *data)
1407 {
1408         u8 ciphers[5];
1409         int count = 0;
1410
1411         if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1412                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1413                            "provisioning TLS cipher suites");
1414                 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1415         }
1416
1417         if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1418                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1419                            "provisioning TLS cipher suites");
1420                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1421                 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1422                 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1423         }
1424
1425         ciphers[count++] = TLS_CIPHER_NONE;
1426
1427         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1428                                            ciphers)) {
1429                 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1430                            "cipher suites for provisioning");
1431                 return -1;
1432         }
1433
1434         return 0;
1435 }
1436
1437
1438 static int eap_fast_process_start(struct eap_sm *sm,
1439                                   struct eap_fast_data *data, u8 flags,
1440                                   const u8 *pos, size_t left)
1441 {
1442         const u8 *a_id;
1443         size_t a_id_len;
1444
1445         /* EAP-FAST Version negotiation (section 3.1) */
1446         wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1447                    flags & EAP_TLS_VERSION_MASK, data->fast_version);
1448         if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1449                 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1450         wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1451                    data->fast_version);
1452
1453         a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1454         eap_fast_select_pac(data, a_id, a_id_len);
1455
1456         if (data->resuming && data->current_pac) {
1457                 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1458                            "do not add PAC-Opaque to TLS ClientHello");
1459                 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1460                         return -1;
1461         } else if (data->current_pac) {
1462                 /*
1463                  * PAC found for the A-ID and we are not resuming an old
1464                  * session, so add PAC-Opaque extension to ClientHello.
1465                  */
1466                 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1467                         return -1;
1468         } else {
1469                 /* No PAC found, so we must provision one. */
1470                 if (!data->provisioning_allowed) {
1471                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1472                                    "provisioning disabled");
1473                         return -1;
1474                 }
1475                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1476                            "starting provisioning");
1477                 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1478                     eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1479                         return -1;
1480                 data->provisioning = 1;
1481         }
1482
1483         return 0;
1484 }
1485
1486
1487 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1488                                         struct eap_method_ret *ret,
1489                                         const struct wpabuf *reqData)
1490 {
1491         const struct eap_hdr *req;
1492         size_t left;
1493         int res;
1494         u8 flags, id;
1495         struct wpabuf *resp;
1496         const u8 *pos;
1497         struct eap_fast_data *data = priv;
1498
1499         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1500                                         reqData, &left, &flags);
1501         if (pos == NULL)
1502                 return NULL;
1503
1504         req = wpabuf_head(reqData);
1505         id = req->identifier;
1506
1507         if (flags & EAP_TLS_FLAGS_START) {
1508                 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1509                         return NULL;
1510
1511                 left = 0; /* A-ID is not used in further packet processing */
1512         }
1513
1514         resp = NULL;
1515         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1516             !data->resuming) {
1517                 /* Process tunneled (encrypted) phase 2 data. */
1518                 struct wpabuf msg;
1519                 wpabuf_set(&msg, pos, left);
1520                 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1521                 if (res < 0) {
1522                         ret->methodState = METHOD_DONE;
1523                         ret->decision = DECISION_FAIL;
1524                         /*
1525                          * Ack possible Alert that may have caused failure in
1526                          * decryption.
1527                          */
1528                         res = 1;
1529                 }
1530         } else {
1531                 /* Continue processing TLS handshake (phase 1). */
1532                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1533                                                   EAP_TYPE_FAST,
1534                                                   data->fast_version, id, pos,
1535                                                   left, &resp);
1536
1537                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1538                         char cipher[80];
1539                         wpa_printf(MSG_DEBUG,
1540                                    "EAP-FAST: TLS done, proceed to Phase 2");
1541                         if (data->provisioning &&
1542                             (!(data->provisioning_allowed &
1543                                EAP_FAST_PROV_AUTH) ||
1544                              tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1545                                             cipher, sizeof(cipher)) < 0 ||
1546                              os_strstr(cipher, "ADH-") ||
1547                              os_strstr(cipher, "anon"))) {
1548                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1549                                            "anonymous (unauthenticated) "
1550                                            "provisioning");
1551                                 data->anon_provisioning = 1;
1552                         } else
1553                                 data->anon_provisioning = 0;
1554                         data->resuming = 0;
1555                         eap_fast_derive_keys(sm, data);
1556                 }
1557
1558                 if (res == 2) {
1559                         struct wpabuf msg;
1560                         /*
1561                          * Application data included in the handshake message.
1562                          */
1563                         wpabuf_free(data->pending_phase2_req);
1564                         data->pending_phase2_req = resp;
1565                         resp = NULL;
1566                         wpabuf_set(&msg, pos, left);
1567                         res = eap_fast_decrypt(sm, data, ret, req, &msg,
1568                                                &resp);
1569                 }
1570         }
1571
1572         if (res == 1) {
1573                 wpabuf_free(resp);
1574                 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1575                                               data->fast_version);
1576         }
1577
1578         return resp;
1579 }
1580
1581
1582 #if 0 /* FIX */
1583 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1584 {
1585         struct eap_fast_data *data = priv;
1586         return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1587 }
1588
1589
1590 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1591 {
1592         struct eap_fast_data *data = priv;
1593         os_free(data->key_block_p);
1594         data->key_block_p = NULL;
1595         wpabuf_free(data->pending_phase2_req);
1596         data->pending_phase2_req = NULL;
1597 }
1598
1599
1600 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1601 {
1602         struct eap_fast_data *data = priv;
1603         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1604                 os_free(data);
1605                 return NULL;
1606         }
1607         if (data->phase2_priv && data->phase2_method &&
1608             data->phase2_method->init_for_reauth)
1609                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1610         data->phase2_success = 0;
1611         data->resuming = 1;
1612         data->provisioning = 0;
1613         data->anon_provisioning = 0;
1614         data->simck_idx = 0;
1615         return priv;
1616 }
1617 #endif
1618
1619
1620 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1621                                size_t buflen, int verbose)
1622 {
1623         struct eap_fast_data *data = priv;
1624         int len, ret;
1625
1626         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1627         if (data->phase2_method) {
1628                 ret = os_snprintf(buf + len, buflen - len,
1629                                   "EAP-FAST Phase2 method=%s\n",
1630                                   data->phase2_method->name);
1631                 if (ret < 0 || (size_t) ret >= buflen - len)
1632                         return len;
1633                 len += ret;
1634         }
1635         return len;
1636 }
1637
1638
1639 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1640 {
1641         struct eap_fast_data *data = priv;
1642         return data->success;
1643 }
1644
1645
1646 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1647 {
1648         struct eap_fast_data *data = priv;
1649         u8 *key;
1650
1651         if (!data->success)
1652                 return NULL;
1653
1654         key = os_malloc(EAP_FAST_KEY_LEN);
1655         if (key == NULL)
1656                 return NULL;
1657
1658         *len = EAP_FAST_KEY_LEN;
1659         os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1660
1661         return key;
1662 }
1663
1664
1665 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1666 {
1667         struct eap_fast_data *data = priv;
1668         u8 *key;
1669
1670         if (!data->success)
1671                 return NULL;
1672
1673         key = os_malloc(EAP_EMSK_LEN);
1674         if (key == NULL)
1675                 return NULL;
1676
1677         *len = EAP_EMSK_LEN;
1678         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1679
1680         return key;
1681 }
1682
1683
1684 int eap_peer_fast_register(void)
1685 {
1686         struct eap_method *eap;
1687         int ret;
1688
1689         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1690                                     EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1691         if (eap == NULL)
1692                 return -1;
1693
1694         eap->init = eap_fast_init;
1695         eap->deinit = eap_fast_deinit;
1696         eap->process = eap_fast_process;
1697         eap->isKeyAvailable = eap_fast_isKeyAvailable;
1698         eap->getKey = eap_fast_getKey;
1699         eap->get_status = eap_fast_get_status;
1700 #if 0
1701         eap->has_reauth_data = eap_fast_has_reauth_data;
1702         eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1703         eap->init_for_reauth = eap_fast_init_for_reauth;
1704 #endif
1705         eap->get_emsk = eap_fast_get_emsk;
1706
1707         ret = eap_peer_method_register(eap);
1708         if (ret)
1709                 eap_peer_method_free(eap);
1710         return ret;
1711 }