contrib/hostapd/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 *session_id;
  57         size_t id_len;
  58         u8 emsk[EAP_EMSK_LEN];
  59         int success;
  60
  61         struct eap_fast_pac *pac;
  62         struct eap_fast_pac *current_pac;
  63         size_t max_pac_list_len;
  64         int use_pac_binary_format;
  65
  66         u8 simck[EAP_FAST_SIMCK_LEN];
  67         int simck_idx;
  68
  69         struct wpabuf *pending_phase2_req;
  70 };
  71
  72
  73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
  74                                       const u8 *client_random,
  75                                       const u8 *server_random,
  76                                       u8 *master_secret)
  77 {
  78         struct eap_fast_data *data = ctx;
  79
  80         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
  81
  82         if (client_random == NULL || server_random == NULL ||
  83             master_secret == NULL) {
  84                 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
  85                            "back to full TLS handshake");
  86                 data->session_ticket_used = 0;
  87                 if (data->provisioning_allowed) {
  88                         wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
  89                                    "new PAC-Key");
  90                         data->provisioning = 1;
  91                         data->current_pac = NULL;
  92                 }
  93                 return 0;
  94         }
  95
  96         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
  97
  98         if (data->current_pac == NULL) {
  99                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
 100                            "using SessionTicket");
 101                 data->session_ticket_used = 0;
 102                 return 0;
 103         }
 104
 105         eap_fast_derive_master_secret(data->current_pac->pac_key,
 106                                       server_random, client_random,
 107                                       master_secret);
 108
 109         data->session_ticket_used = 1;
 110
 111         return 1;
 112 }
 113
 114
 115 static int eap_fast_parse_phase1(struct eap_fast_data *data,
 116                                  const char *phase1)
 117 {
 118         const char *pos;
 119
 120         pos = os_strstr(phase1, "fast_provisioning=");
 121         if (pos) {
 122                 data->provisioning_allowed = atoi(pos + 18);
 123                 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
 124                            "mode: %d", data->provisioning_allowed);
 125         }
 126
 127         pos = os_strstr(phase1, "fast_max_pac_list_len=");
 128         if (pos) {
 129                 data->max_pac_list_len = atoi(pos + 22);
 130                 if (data->max_pac_list_len == 0)
 131                         data->max_pac_list_len = 1;
 132                 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
 133                            (unsigned long) data->max_pac_list_len);
 134         }
 135
 136         pos = os_strstr(phase1, "fast_pac_format=binary");
 137         if (pos) {
 138                 data->use_pac_binary_format = 1;
 139                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
 140                            "list");
 141         }
 142
 143         return 0;
 144 }
 145
 146
 147 static void * eap_fast_init(struct eap_sm *sm)
 148 {
 149         struct eap_fast_data *data;
 150         struct eap_peer_config *config = eap_get_config(sm);
 151
 152         data = os_zalloc(sizeof(*data));
 153         if (data == NULL)
 154                 return NULL;
 155         data->fast_version = EAP_FAST_VERSION;
 156         data->max_pac_list_len = 10;
 157
 158         if (config && config->phase1 &&
 159             eap_fast_parse_phase1(data, config->phase1) < 0) {
 160                 eap_fast_deinit(sm, data);
 161                 return NULL;
 162         }
 163
 164         if (eap_peer_select_phase2_methods(config, "auth=",
 165                                            &data->phase2_types,
 166                                            &data->num_phase2_types) < 0) {
 167                 eap_fast_deinit(sm, data);
 168                 return NULL;
 169         }
 170
 171         data->phase2_type.vendor = EAP_VENDOR_IETF;
 172         data->phase2_type.method = EAP_TYPE_NONE;
 173
 174         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
 175                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 176                 eap_fast_deinit(sm, data);
 177                 return NULL;
 178         }
 179
 180         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 181                                                  eap_fast_session_ticket_cb,
 182                                                  data) < 0) {
 183                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 184                            "callback");
 185                 eap_fast_deinit(sm, data);
 186                 return NULL;
 187         }
 188
 189         /*
 190          * The local RADIUS server in a Cisco AP does not seem to like empty
 191          * fragments before data, so disable that workaround for CBC.
 192          * TODO: consider making this configurable
 193          */
 194         if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
 195                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
 196                            "workarounds");
 197         }
 198
 199         if (!config->pac_file) {
 200                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
 201                 eap_fast_deinit(sm, data);
 202                 return NULL;
 203         }
 204
 205         if (data->use_pac_binary_format &&
 206             eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
 207                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 208                 eap_fast_deinit(sm, data);
 209                 return NULL;
 210         }
 211
 212         if (!data->use_pac_binary_format &&
 213             eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
 214                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 215                 eap_fast_deinit(sm, data);
 216                 return NULL;
 217         }
 218         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
 219
 220         if (data->pac == NULL && !data->provisioning_allowed) {
 221                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
 222                            "provisioning disabled");
 223                 eap_fast_deinit(sm, data);
 224                 return NULL;
 225         }
 226
 227         return data;
 228 }
 229
 230
 231 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
 232 {
 233         struct eap_fast_data *data = priv;
 234         struct eap_fast_pac *pac, *prev;
 235
 236         if (data == NULL)
 237                 return;
 238         if (data->phase2_priv && data->phase2_method)
 239                 data->phase2_method->deinit(sm, data->phase2_priv);
 240         os_free(data->phase2_types);
 241         os_free(data->key_block_p);
 242         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 243
 244         pac = data->pac;
 245         prev = NULL;
 246         while (pac) {
 247                 prev = pac;
 248                 pac = pac->next;
 249                 eap_fast_free_pac(prev);
 250         }
 251         os_free(data->session_id);
 252         wpabuf_free(data->pending_phase2_req);
 253         os_free(data);
 254 }
 255
 256
 257 static int eap_fast_derive_msk(struct eap_fast_data *data)
 258 {
 259         eap_fast_derive_eap_msk(data->simck, data->key_data);
 260         eap_fast_derive_eap_emsk(data->simck, data->emsk);
 261         data->success = 1;
 262         return 0;
 263 }
 264
 265
 266 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 267                                      struct eap_fast_data *data)
 268 {
 269         u8 *sks;
 270
 271         /* RFC 4851, Section 5.1:
 272          * Extra key material after TLS key_block: session_key_seed[40]
 273          */
 274
 275         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 276                                   EAP_FAST_SKS_LEN);
 277         if (sks == NULL) {
 278                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 279                            "session_key_seed");
 280                 return;
 281         }
 282
 283         /*
 284          * RFC 4851, Section 5.2:
 285          * S-IMCK[0] = session_key_seed
 286          */
 287         wpa_hexdump_key(MSG_DEBUG,
 288                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 289                         sks, EAP_FAST_SKS_LEN);
 290         data->simck_idx = 0;
 291         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 292         os_free(sks);
 293 }
 294
 295
 296 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 297                                              struct eap_fast_data *data)
 298 {
 299         os_free(data->key_block_p);
 300         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 301                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 302                                     "key expansion",
 303                                     sizeof(*data->key_block_p));
 304         if (data->key_block_p == NULL) {
 305                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 306                 return;
 307         }
 308         /*
 309          * RFC 4851, Section 5.2:
 310          * S-IMCK[0] = session_key_seed
 311          */
 312         wpa_hexdump_key(MSG_DEBUG,
 313                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 314                         data->key_block_p->session_key_seed,
 315                         sizeof(data->key_block_p->session_key_seed));
 316         data->simck_idx = 0;
 317         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 318                   EAP_FAST_SIMCK_LEN);
 319         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 320                         data->key_block_p->server_challenge,
 321                         sizeof(data->key_block_p->server_challenge));
 322         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 323                         data->key_block_p->client_challenge,
 324                         sizeof(data->key_block_p->client_challenge));
 325 }
 326
 327
 328 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
 329 {
 330         if (data->anon_provisioning)
 331                 eap_fast_derive_key_provisioning(sm, data);
 332         else
 333                 eap_fast_derive_key_auth(sm, data);
 334 }
 335
 336
 337 static int eap_fast_init_phase2_method(struct eap_sm *sm,
 338                                        struct eap_fast_data *data)
 339 {
 340         data->phase2_method =
 341                 eap_peer_get_eap_method(data->phase2_type.vendor,
 342                                         data->phase2_type.method);
 343         if (data->phase2_method == NULL)
 344                 return -1;
 345
 346         if (data->key_block_p) {
 347                 sm->auth_challenge = data->key_block_p->server_challenge;
 348                 sm->peer_challenge = data->key_block_p->client_challenge;
 349         }
 350         sm->init_phase2 = 1;
 351         data->phase2_priv = data->phase2_method->init(sm);
 352         sm->init_phase2 = 0;
 353         sm->auth_challenge = NULL;
 354         sm->peer_challenge = NULL;
 355
 356         return data->phase2_priv == NULL ? -1 : 0;
 357 }
 358
 359
 360 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
 361 {
 362         size_t i;
 363
 364         /* TODO: TNC with anonymous provisioning; need to require both
 365          * completed MSCHAPv2 and TNC */
 366
 367         if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
 368                 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
 369                            "during unauthenticated provisioning; reject phase2"
 370                            " type %d", type);
 371                 return -1;
 372         }
 373
 374 #ifdef EAP_TNC
 375         if (type == EAP_TYPE_TNC) {
 376                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 377                 data->phase2_type.method = EAP_TYPE_TNC;
 378                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 379                            "vendor %d method %d for TNC",
 380                            data->phase2_type.vendor,
 381                            data->phase2_type.method);
 382                 return 0;
 383         }
 384 #endif /* EAP_TNC */
 385
 386         for (i = 0; i < data->num_phase2_types; i++) {
 387                 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
 388                     data->phase2_types[i].method != type)
 389                         continue;
 390
 391                 data->phase2_type.vendor = data->phase2_types[i].vendor;
 392                 data->phase2_type.method = data->phase2_types[i].method;
 393                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 394                            "vendor %d method %d",
 395                            data->phase2_type.vendor,
 396                            data->phase2_type.method);
 397                 break;
 398         }
 399
 400         if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
 401                 return -1;
 402
 403         return 0;
 404 }
 405
 406
 407 static int eap_fast_phase2_request(struct eap_sm *sm,
 408                                    struct eap_fast_data *data,
 409                                    struct eap_method_ret *ret,
 410                                    struct eap_hdr *hdr,
 411                                    struct wpabuf **resp)
 412 {
 413         size_t len = be_to_host16(hdr->length);
 414         u8 *pos;
 415         struct eap_method_ret iret;
 416         struct eap_peer_config *config = eap_get_config(sm);
 417         struct wpabuf msg;
 418
 419         if (len <= sizeof(struct eap_hdr)) {
 420                 wpa_printf(MSG_INFO, "EAP-FAST: too short "
 421                            "Phase 2 request (len=%lu)", (unsigned long) len);
 422                 return -1;
 423         }
 424         pos = (u8 *) (hdr + 1);
 425         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
 426         if (*pos == EAP_TYPE_IDENTITY) {
 427                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 428                 return 0;
 429         }
 430
 431         if (data->phase2_priv && data->phase2_method &&
 432             *pos != data->phase2_type.method) {
 433                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
 434                            "deinitialize previous method");
 435                 data->phase2_method->deinit(sm, data->phase2_priv);
 436                 data->phase2_method = NULL;
 437                 data->phase2_priv = NULL;
 438                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 439                 data->phase2_type.method = EAP_TYPE_NONE;
 440         }
 441
 442         if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 443             data->phase2_type.method == EAP_TYPE_NONE &&
 444             eap_fast_select_phase2_method(data, *pos) < 0) {
 445                 if (eap_peer_tls_phase2_nak(data->phase2_types,
 446                                             data->num_phase2_types,
 447                                             hdr, resp))
 448                         return -1;
 449                 return 0;
 450         }
 451
 452         if ((data->phase2_priv == NULL &&
 453              eap_fast_init_phase2_method(sm, data) < 0) ||
 454             data->phase2_method == NULL) {
 455                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
 456                            "Phase 2 EAP method %d", *pos);
 457                 ret->methodState = METHOD_DONE;
 458                 ret->decision = DECISION_FAIL;
 459                 return -1;
 460         }
 461
 462         os_memset(&iret, 0, sizeof(iret));
 463         wpabuf_set(&msg, hdr, len);
 464         *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
 465                                              &msg);
 466         if (*resp == NULL ||
 467             (iret.methodState == METHOD_DONE &&
 468              iret.decision == DECISION_FAIL)) {
 469                 ret->methodState = METHOD_DONE;
 470                 ret->decision = DECISION_FAIL;
 471         } else if ((iret.methodState == METHOD_DONE ||
 472                     iret.methodState == METHOD_MAY_CONT) &&
 473                    (iret.decision == DECISION_UNCOND_SUCC ||
 474                     iret.decision == DECISION_COND_SUCC)) {
 475                 data->phase2_success = 1;
 476         }
 477
 478         if (*resp == NULL && config &&
 479             (config->pending_req_identity || config->pending_req_password ||
 480              config->pending_req_otp || config->pending_req_new_password)) {
 481                 wpabuf_free(data->pending_phase2_req);
 482                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 483         } else if (*resp == NULL)
 484                 return -1;
 485
 486         return 0;
 487 }
 488
 489
 490 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
 491 {
 492         struct wpabuf *buf;
 493         struct eap_tlv_nak_tlv *nak;
 494         buf = wpabuf_alloc(sizeof(*nak));
 495         if (buf == NULL)
 496                 return NULL;
 497         nak = wpabuf_put(buf, sizeof(*nak));
 498         nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
 499         nak->length = host_to_be16(6);
 500         nak->vendor_id = host_to_be32(vendor_id);
 501         nak->nak_type = host_to_be16(tlv_type);
 502         return buf;
 503 }
 504
 505
 506 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
 507 {
 508         struct wpabuf *buf;
 509         struct eap_tlv_intermediate_result_tlv *result;
 510         buf = wpabuf_alloc(sizeof(*result));
 511         if (buf == NULL)
 512                 return NULL;
 513         wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
 514                    intermediate ? "Intermediate " : "", status);
 515         result = wpabuf_put(buf, sizeof(*result));
 516         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 517                                         (intermediate ?
 518                                          EAP_TLV_INTERMEDIATE_RESULT_TLV :
 519                                          EAP_TLV_RESULT_TLV));
 520         result->length = host_to_be16(2);
 521         result->status = host_to_be16(status);
 522         return buf;
 523 }
 524
 525
 526 static struct wpabuf * eap_fast_tlv_pac_ack(void)
 527 {
 528         struct wpabuf *buf;
 529         struct eap_tlv_result_tlv *res;
 530         struct eap_tlv_pac_ack_tlv *ack;
 531
 532         buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
 533         if (buf == NULL)
 534                 return NULL;
 535
 536         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
 537         ack = wpabuf_put(buf, sizeof(*ack));
 538         ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
 539                                      EAP_TLV_TYPE_MANDATORY);
 540         ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
 541         ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
 542         ack->pac_len = host_to_be16(2);
 543         ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 544
 545         return buf;
 546 }
 547
 548
 549 static struct wpabuf * eap_fast_process_eap_payload_tlv(
 550         struct eap_sm *sm, struct eap_fast_data *data,
 551         struct eap_method_ret *ret,
 552         u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
 553 {
 554         struct eap_hdr *hdr;
 555         struct wpabuf *resp = NULL;
 556
 557         if (eap_payload_tlv_len < sizeof(*hdr)) {
 558                 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
 559                            "Payload TLV (len=%lu)",
 560                            (unsigned long) eap_payload_tlv_len);
 561                 return NULL;
 562         }
 563
 564         hdr = (struct eap_hdr *) eap_payload_tlv;
 565         if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
 566                 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
 567                            "EAP Payload TLV");
 568                 return NULL;
 569         }
 570
 571         if (hdr->code != EAP_CODE_REQUEST) {
 572                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
 573                            "Phase 2 EAP header", hdr->code);
 574                 return NULL;
 575         }
 576
 577         if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
 578                 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
 579                            "failed");
 580                 return NULL;
 581         }
 582
 583         return eap_fast_tlv_eap_payload(resp);
 584 }
 585
 586
 587 static int eap_fast_validate_crypto_binding(
 588         struct eap_tlv_crypto_binding_tlv *_bind)
 589 {
 590         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
 591                    "Received Version %d SubType %d",
 592                    _bind->version, _bind->received_version, _bind->subtype);
 593         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 594                     _bind->nonce, sizeof(_bind->nonce));
 595         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 596                     _bind->compound_mac, sizeof(_bind->compound_mac));
 597
 598         if (_bind->version != EAP_FAST_VERSION ||
 599             _bind->received_version != EAP_FAST_VERSION ||
 600             _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
 601                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
 602                            "Crypto-Binding TLV: Version %d "
 603                            "Received Version %d SubType %d",
 604                            _bind->version, _bind->received_version,
 605                            _bind->subtype);
 606                 return -1;
 607         }
 608
 609         return 0;
 610 }
 611
 612
 613 static void eap_fast_write_crypto_binding(
 614         struct eap_tlv_crypto_binding_tlv *rbind,
 615         struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
 616 {
 617         rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 618                                        EAP_TLV_CRYPTO_BINDING_TLV);
 619         rbind->length = host_to_be16(sizeof(*rbind) -
 620                                      sizeof(struct eap_tlv_hdr));
 621         rbind->version = EAP_FAST_VERSION;
 622         rbind->received_version = _bind->version;
 623         rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
 624         os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
 625         inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
 626         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
 627                   rbind->compound_mac);
 628
 629         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
 630                    "Received Version %d SubType %d",
 631                    rbind->version, rbind->received_version, rbind->subtype);
 632         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 633                     rbind->nonce, sizeof(rbind->nonce));
 634         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 635                     rbind->compound_mac, sizeof(rbind->compound_mac));
 636 }
 637
 638
 639 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 640                                    struct eap_fast_data *data,
 641                                    u8 *isk, size_t isk_len)
 642 {
 643         u8 *key;
 644         size_t key_len;
 645
 646         os_memset(isk, 0, isk_len);
 647
 648         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 649                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 650                            "available");
 651                 return -1;
 652         }
 653
 654         if (data->phase2_method->isKeyAvailable == NULL ||
 655             data->phase2_method->getKey == NULL)
 656                 return 0;
 657
 658         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 659             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 660                                                &key_len)) == NULL) {
 661                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 662                            "from Phase 2");
 663                 return -1;
 664         }
 665
 666         if (key_len > isk_len)
 667                 key_len = isk_len;
 668         if (key_len == 32 &&
 669             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 670             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 671                 /*
 672                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 673                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 674                  * ISK for EAP-FAST cryptobinding.
 675                  */
 676                 os_memcpy(isk, key + 16, 16);
 677                 os_memcpy(isk + 16, key, 16);
 678         } else
 679                 os_memcpy(isk, key, key_len);
 680         os_free(key);
 681
 682         return 0;
 683 }
 684
 685
 686 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
 687                             u8 *cmk)
 688 {
 689         u8 isk[32], imck[60];
 690
 691         wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
 692                    "calculation", data->simck_idx + 1);
 693
 694         /*
 695          * RFC 4851, Section 5.2:
 696          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 697          *                 MSK[j], 60)
 698          * S-IMCK[j] = first 40 octets of IMCK[j]
 699          * CMK[j] = last 20 octets of IMCK[j]
 700          */
 701
 702         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 703                 return -1;
 704         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 705         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 706                    "Inner Methods Compound Keys",
 707                    isk, sizeof(isk), imck, sizeof(imck));
 708         data->simck_idx++;
 709         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 710         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 711                         data->simck, EAP_FAST_SIMCK_LEN);
 712         os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 713         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 714                         cmk, EAP_FAST_CMK_LEN);
 715
 716         return 0;
 717 }
 718
 719
 720 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
 721 {
 722         struct eap_tlv_hdr *pac;
 723         struct eap_tlv_request_action_tlv *act;
 724         struct eap_tlv_pac_type_tlv *type;
 725
 726         act = (struct eap_tlv_request_action_tlv *) pos;
 727         act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
 728         act->length = host_to_be16(2);
 729         act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
 730
 731         pac = (struct eap_tlv_hdr *) (act + 1);
 732         pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
 733         pac->length = host_to_be16(sizeof(*type));
 734
 735         type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
 736         type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
 737         type->length = host_to_be16(2);
 738         type->pac_type = host_to_be16(pac_type);
 739
 740         return (u8 *) (type + 1);
 741 }
 742
 743
 744 static struct wpabuf * eap_fast_process_crypto_binding(
 745         struct eap_sm *sm, struct eap_fast_data *data,
 746         struct eap_method_ret *ret,
 747         struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
 748 {
 749         struct wpabuf *resp;
 750         u8 *pos;
 751         u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
 752         int res;
 753         size_t len;
 754
 755         if (eap_fast_validate_crypto_binding(_bind) < 0)
 756                 return NULL;
 757
 758         if (eap_fast_get_cmk(sm, data, cmk) < 0)
 759                 return NULL;
 760
 761         /* Validate received Compound MAC */
 762         os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
 763         os_memset(_bind->compound_mac, 0, sizeof(cmac));
 764         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
 765                     "MAC calculation", (u8 *) _bind, bind_len);
 766         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
 767                   _bind->compound_mac);
 768         res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
 769         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
 770                     cmac, sizeof(cmac));
 771         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
 772                     _bind->compound_mac, sizeof(cmac));
 773         if (res != 0) {
 774                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
 775                 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
 776                 return NULL;
 777         }
 778
 779         /*
 780          * Compound MAC was valid, so authentication succeeded. Reply with
 781          * crypto binding to allow server to complete authentication.
 782          */
 783
 784         len = sizeof(struct eap_tlv_crypto_binding_tlv);
 785         resp = wpabuf_alloc(len);
 786         if (resp == NULL)
 787                 return NULL;
 788
 789         if (!data->anon_provisioning && data->phase2_success &&
 790             eap_fast_derive_msk(data) < 0) {
 791                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
 792                 ret->methodState = METHOD_DONE;
 793                 ret->decision = DECISION_FAIL;
 794                 data->phase2_success = 0;
 795                 wpabuf_free(resp);
 796                 return NULL;
 797         }
 798
 799         if (!data->anon_provisioning && data->phase2_success) {
 800                 os_free(data->session_id);
 801                 data->session_id = eap_peer_tls_derive_session_id(
 802                         sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
 803                 if (data->session_id) {
 804                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
 805                                     data->session_id, data->id_len);
 806                 } else {
 807                         wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
 808                                    "Session-Id");
 809                         wpabuf_free(resp);
 810                         return NULL;
 811                 }
 812         }
 813
 814         pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
 815         eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
 816                                       pos, _bind, cmk);
 817
 818         return resp;
 819 }
 820
 821
 822 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
 823                                    u8 *pos, size_t len, int *pac_key_found)
 824 {
 825         switch (type & 0x7fff) {
 826         case PAC_TYPE_PAC_KEY:
 827                 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
 828                 if (len != EAP_FAST_PAC_KEY_LEN) {
 829                         wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
 830                                    "length %lu", (unsigned long) len);
 831                         break;
 832                 }
 833                 *pac_key_found = 1;
 834                 os_memcpy(entry->pac_key, pos, len);
 835                 break;
 836         case PAC_TYPE_PAC_OPAQUE:
 837                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
 838                 entry->pac_opaque = pos;
 839                 entry->pac_opaque_len = len;
 840                 break;
 841         case PAC_TYPE_PAC_INFO:
 842                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
 843                 entry->pac_info = pos;
 844                 entry->pac_info_len = len;
 845                 break;
 846         default:
 847                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
 848                            type);
 849                 break;
 850         }
 851 }
 852
 853
 854 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
 855                                     u8 *pac, size_t pac_len)
 856 {
 857         struct pac_tlv_hdr *hdr;
 858         u8 *pos;
 859         size_t left, len;
 860         int type, pac_key_found = 0;
 861
 862         pos = pac;
 863         left = pac_len;
 864
 865         while (left > sizeof(*hdr)) {
 866                 hdr = (struct pac_tlv_hdr *) pos;
 867                 type = be_to_host16(hdr->type);
 868                 len = be_to_host16(hdr->len);
 869                 pos += sizeof(*hdr);
 870                 left -= sizeof(*hdr);
 871                 if (len > left) {
 872                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
 873                                    "(type=%d len=%lu left=%lu)",
 874                                    type, (unsigned long) len,
 875                                    (unsigned long) left);
 876                         return -1;
 877                 }
 878
 879                 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
 880
 881                 pos += len;
 882                 left -= len;
 883         }
 884
 885         if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
 886                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
 887                            "all the required fields");
 888                 return -1;
 889         }
 890
 891         return 0;
 892 }
 893
 894
 895 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
 896                                    u8 *pos, size_t len)
 897 {
 898         u16 pac_type;
 899         u32 lifetime;
 900         struct os_time now;
 901
 902         switch (type & 0x7fff) {
 903         case PAC_TYPE_CRED_LIFETIME:
 904                 if (len != 4) {
 905                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
 906                                     "Invalid CRED_LIFETIME length - ignored",
 907                                     pos, len);
 908                         return 0;
 909                 }
 910
 911                 /*
 912                  * This is not currently saved separately in PAC files since
 913                  * the server can automatically initiate PAC update when
 914                  * needed. Anyway, the information is available from PAC-Info
 915                  * dump if it is needed for something in the future.
 916                  */
 917                 lifetime = WPA_GET_BE32(pos);
 918                 os_get_time(&now);
 919                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
 920                            "(%d days)",
 921                            lifetime, (lifetime - (u32) now.sec) / 86400);
 922                 break;
 923         case PAC_TYPE_A_ID:
 924                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
 925                                   pos, len);
 926                 entry->a_id = pos;
 927                 entry->a_id_len = len;
 928                 break;
 929         case PAC_TYPE_I_ID:
 930                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
 931                                   pos, len);
 932                 entry->i_id = pos;
 933                 entry->i_id_len = len;
 934                 break;
 935         case PAC_TYPE_A_ID_INFO:
 936                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
 937                                   pos, len);
 938                 entry->a_id_info = pos;
 939                 entry->a_id_info_len = len;
 940                 break;
 941         case PAC_TYPE_PAC_TYPE:
 942                 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
 943                 if (len != 2) {
 944                         wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
 945                                    "length %lu (expected 2)",
 946                                    (unsigned long) len);
 947                         wpa_hexdump_ascii(MSG_DEBUG,
 948                                           "EAP-FAST: PAC-Info - PAC-Type",
 949                                           pos, len);
 950                         return -1;
 951                 }
 952                 pac_type = WPA_GET_BE16(pos);
 953                 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
 954                     pac_type != PAC_TYPE_USER_AUTHORIZATION &&
 955                     pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
 956                         wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
 957                                    "%d", pac_type);
 958                         return -1;
 959                 }
 960
 961                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
 962                            pac_type);
 963                 entry->pac_type = pac_type;
 964                 break;
 965         default:
 966                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
 967                            "type %d", type);
 968                 break;
 969         }
 970
 971         return 0;
 972 }
 973
 974
 975 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
 976 {
 977         struct pac_tlv_hdr *hdr;
 978         u8 *pos;
 979         size_t left, len;
 980         int type;
 981
 982         /* RFC 5422, Section 4.2.4 */
 983
 984         /* PAC-Type defaults to Tunnel PAC (Type 1) */
 985         entry->pac_type = PAC_TYPE_TUNNEL_PAC;
 986
 987         pos = entry->pac_info;
 988         left = entry->pac_info_len;
 989         while (left > sizeof(*hdr)) {
 990                 hdr = (struct pac_tlv_hdr *) pos;
 991                 type = be_to_host16(hdr->type);
 992                 len = be_to_host16(hdr->len);
 993                 pos += sizeof(*hdr);
 994                 left -= sizeof(*hdr);
 995                 if (len > left) {
 996                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
 997                                    "(type=%d len=%lu left=%lu)",
 998                                    type, (unsigned long) len,
 999                                    (unsigned long) left);
1000                         return -1;
1001                 }
1002
1003                 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
1004                         return -1;
1005
1006                 pos += len;
1007                 left -= len;
1008         }
1009
1010         if (entry->a_id == NULL || entry->a_id_info == NULL) {
1011                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1012                            "all the required fields");
1013                 return -1;
1014         }
1015
1016         return 0;
1017 }
1018
1019
1020 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1021                                             struct eap_fast_data *data,
1022                                             struct eap_method_ret *ret,
1023                                             u8 *pac, size_t pac_len)
1024 {
1025         struct eap_peer_config *config = eap_get_config(sm);
1026         struct eap_fast_pac entry;
1027
1028         os_memset(&entry, 0, sizeof(entry));
1029         if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1030             eap_fast_process_pac_info(&entry))
1031                 return NULL;
1032
1033         eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1034         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1035         if (data->use_pac_binary_format)
1036                 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1037         else
1038                 eap_fast_save_pac(sm, data->pac, config->pac_file);
1039
1040         if (data->provisioning) {
1041                 if (data->anon_provisioning) {
1042                         /*
1043                          * Unauthenticated provisioning does not provide keying
1044                          * material and must end with an EAP-Failure.
1045                          * Authentication will be done separately after this.
1046                          */
1047                         data->success = 0;
1048                         ret->decision = DECISION_FAIL;
1049                 } else {
1050                         /*
1051                          * Server may or may not allow authenticated
1052                          * provisioning also for key generation.
1053                          */
1054                         ret->decision = DECISION_COND_SUCC;
1055                 }
1056                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1057                            "- Provisioning completed successfully");
1058                 sm->expected_failure = 1;
1059         } else {
1060                 /*
1061                  * This is PAC refreshing, i.e., normal authentication that is
1062                  * expected to be completed with an EAP-Success. However,
1063                  * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1064                  * after protected success exchange in case of EAP-Fast
1065                  * provisioning, so we better use DECISION_COND_SUCC here
1066                  * instead of DECISION_UNCOND_SUCC.
1067                  */
1068                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1069                            "- PAC refreshing completed successfully");
1070                 ret->decision = DECISION_COND_SUCC;
1071         }
1072         ret->methodState = METHOD_DONE;
1073         return eap_fast_tlv_pac_ack();
1074 }
1075
1076
1077 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1078                                     struct eap_fast_tlv_parse *tlv,
1079                                     struct wpabuf **resp)
1080 {
1081         int mandatory, tlv_type, len, res;
1082         u8 *pos, *end;
1083
1084         os_memset(tlv, 0, sizeof(*tlv));
1085
1086         /* Parse TLVs from the decrypted Phase 2 data */
1087         pos = wpabuf_mhead(decrypted);
1088         end = pos + wpabuf_len(decrypted);
1089         while (pos + 4 < end) {
1090                 mandatory = pos[0] & 0x80;
1091                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1092                 pos += 2;
1093                 len = WPA_GET_BE16(pos);
1094                 pos += 2;
1095                 if (pos + len > end) {
1096                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1097                         return -1;
1098                 }
1099                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1100                            "TLV type %d length %d%s",
1101                            tlv_type, len, mandatory ? " (mandatory)" : "");
1102
1103                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1104                 if (res == -2)
1105                         break;
1106                 if (res < 0) {
1107                         if (mandatory) {
1108                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1109                                            "mandatory TLV type %d", tlv_type);
1110                                 *resp = eap_fast_tlv_nak(0, tlv_type);
1111                                 break;
1112                         } else {
1113                                 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1114                                            "unknown optional TLV type %d",
1115                                            tlv_type);
1116                         }
1117                 }
1118
1119                 pos += len;
1120         }
1121
1122         return 0;
1123 }
1124
1125
1126 static int eap_fast_encrypt_response(struct eap_sm *sm,
1127                                      struct eap_fast_data *data,
1128                                      struct wpabuf *resp,
1129                                      u8 identifier, struct wpabuf **out_data)
1130 {
1131         if (resp == NULL)
1132                 return 0;
1133
1134         wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1135                         resp);
1136         if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1137                                  data->fast_version, identifier,
1138                                  resp, out_data)) {
1139                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1140                            "frame");
1141         }
1142         wpabuf_free(resp);
1143
1144         return 0;
1145 }
1146
1147
1148 static struct wpabuf * eap_fast_pac_request(void)
1149 {
1150         struct wpabuf *tmp;
1151         u8 *pos, *pos2;
1152
1153         tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1154                            sizeof(struct eap_tlv_request_action_tlv) +
1155                            sizeof(struct eap_tlv_pac_type_tlv));
1156         if (tmp == NULL)
1157                 return NULL;
1158
1159         pos = wpabuf_put(tmp, 0);
1160         pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1161         wpabuf_put(tmp, pos2 - pos);
1162         return tmp;
1163 }
1164
1165
1166 static int eap_fast_process_decrypted(struct eap_sm *sm,
1167                                       struct eap_fast_data *data,
1168                                       struct eap_method_ret *ret,
1169                                       const struct eap_hdr *req,
1170                                       struct wpabuf *decrypted,
1171                                       struct wpabuf **out_data)
1172 {
1173         struct wpabuf *resp = NULL, *tmp;
1174         struct eap_fast_tlv_parse tlv;
1175         int failed = 0;
1176
1177         if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1178                 return 0;
1179         if (resp)
1180                 return eap_fast_encrypt_response(sm, data, resp,
1181                                                  req->identifier, out_data);
1182
1183         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1184                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1185                 return eap_fast_encrypt_response(sm, data, resp,
1186                                                  req->identifier, out_data);
1187         }
1188
1189         if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1190                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1191                 return eap_fast_encrypt_response(sm, data, resp,
1192                                                  req->identifier, out_data);
1193         }
1194
1195         if (tlv.crypto_binding) {
1196                 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1197                                                       tlv.crypto_binding,
1198                                                       tlv.crypto_binding_len);
1199                 if (tmp == NULL)
1200                         failed = 1;
1201                 else
1202                         resp = wpabuf_concat(resp, tmp);
1203         }
1204
1205         if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1206                 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1207                                           EAP_TLV_RESULT_SUCCESS, 1);
1208                 resp = wpabuf_concat(resp, tmp);
1209         }
1210
1211         if (tlv.eap_payload_tlv) {
1212                 tmp = eap_fast_process_eap_payload_tlv(
1213                         sm, data, ret, tlv.eap_payload_tlv,
1214                         tlv.eap_payload_tlv_len);
1215                 resp = wpabuf_concat(resp, tmp);
1216         }
1217
1218         if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1219                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1220                            "acknowledging success");
1221                 failed = 1;
1222         } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1223                 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1224                                            tlv.pac_len);
1225                 resp = wpabuf_concat(resp, tmp);
1226         }
1227
1228         if (data->current_pac == NULL && data->provisioning &&
1229             !data->anon_provisioning && !tlv.pac &&
1230             (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1231              tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1232                 /*
1233                  * Need to request Tunnel PAC when using authenticated
1234                  * provisioning.
1235                  */
1236                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1237                 tmp = eap_fast_pac_request();
1238                 resp = wpabuf_concat(resp, tmp);
1239         }
1240
1241         if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1242                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1243                 resp = wpabuf_concat(tmp, resp);
1244         } else if (failed) {
1245                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1246                 resp = wpabuf_concat(tmp, resp);
1247         }
1248
1249         if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1250             tlv.crypto_binding && data->phase2_success) {
1251                 if (data->anon_provisioning) {
1252                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1253                                    "provisioning completed successfully.");
1254                         ret->methodState = METHOD_DONE;
1255                         ret->decision = DECISION_FAIL;
1256                         sm->expected_failure = 1;
1257                 } else {
1258                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1259                                    "completed successfully.");
1260                         if (data->provisioning)
1261                                 ret->methodState = METHOD_MAY_CONT;
1262                         else
1263                                 ret->methodState = METHOD_DONE;
1264                         ret->decision = DECISION_UNCOND_SUCC;
1265                 }
1266         }
1267
1268         if (resp == NULL) {
1269                 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1270                            "empty response packet");
1271                 resp = wpabuf_alloc(1);
1272         }
1273
1274         return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1275                                          out_data);
1276 }
1277
1278
1279 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1280                             struct eap_method_ret *ret,
1281                             const struct eap_hdr *req,
1282                             const struct wpabuf *in_data,
1283                             struct wpabuf **out_data)
1284 {
1285         struct wpabuf *in_decrypted;
1286         int res;
1287
1288         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1289                    " Phase 2", (unsigned long) wpabuf_len(in_data));
1290
1291         if (data->pending_phase2_req) {
1292                 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1293                            "skip decryption and use old data");
1294                 /* Clear TLS reassembly state. */
1295                 eap_peer_tls_reset_input(&data->ssl);
1296
1297                 in_decrypted = data->pending_phase2_req;
1298                 data->pending_phase2_req = NULL;
1299                 goto continue_req;
1300         }
1301
1302         if (wpabuf_len(in_data) == 0) {
1303                 /* Received TLS ACK - requesting more fragments */
1304                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1305                                             data->fast_version,
1306                                             req->identifier, NULL, out_data);
1307         }
1308
1309         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1310         if (res)
1311                 return res;
1312
1313 continue_req:
1314         wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1315                         in_decrypted);
1316
1317         if (wpabuf_len(in_decrypted) < 4) {
1318                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1319                            "TLV frame (len=%lu)",
1320                            (unsigned long) wpabuf_len(in_decrypted));
1321                 wpabuf_free(in_decrypted);
1322                 return -1;
1323         }
1324
1325         res = eap_fast_process_decrypted(sm, data, ret, req,
1326                                          in_decrypted, out_data);
1327
1328         wpabuf_free(in_decrypted);
1329
1330         return res;
1331 }
1332
1333
1334 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1335 {
1336         const u8 *a_id;
1337         struct pac_tlv_hdr *hdr;
1338
1339         /*
1340          * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1341          * supports both raw A-ID and one inside an A-ID TLV.
1342          */
1343         a_id = buf;
1344         *id_len = len;
1345         if (len > sizeof(*hdr)) {
1346                 int tlen;
1347                 hdr = (struct pac_tlv_hdr *) buf;
1348                 tlen = be_to_host16(hdr->len);
1349                 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1350                     sizeof(*hdr) + tlen <= len) {
1351                         wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1352                                    "(Start)");
1353                         a_id = (u8 *) (hdr + 1);
1354                         *id_len = tlen;
1355                 }
1356         }
1357         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1358
1359         return a_id;
1360 }
1361
1362
1363 static void eap_fast_select_pac(struct eap_fast_data *data,
1364                                 const u8 *a_id, size_t a_id_len)
1365 {
1366         data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1367                                              PAC_TYPE_TUNNEL_PAC);
1368         if (data->current_pac == NULL) {
1369                 /*
1370                  * Tunnel PAC was not available for this A-ID. Try to use
1371                  * Machine Authentication PAC, if one is available.
1372                  */
1373                 data->current_pac = eap_fast_get_pac(
1374                         data->pac, a_id, a_id_len,
1375                         PAC_TYPE_MACHINE_AUTHENTICATION);
1376         }
1377
1378         if (data->current_pac) {
1379                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1380                            "(PAC-Type %d)", data->current_pac->pac_type);
1381                 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1382                                   data->current_pac->a_id_info,
1383                                   data->current_pac->a_id_info_len);
1384         }
1385 }
1386
1387
1388 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1389                                    struct eap_fast_data *data,
1390                                    struct eap_fast_pac *pac)
1391 {
1392         u8 *tlv;
1393         size_t tlv_len, olen;
1394         struct eap_tlv_hdr *ehdr;
1395
1396         olen = pac->pac_opaque_len;
1397         tlv_len = sizeof(*ehdr) + olen;
1398         tlv = os_malloc(tlv_len);
1399         if (tlv) {
1400                 ehdr = (struct eap_tlv_hdr *) tlv;
1401                 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1402                 ehdr->length = host_to_be16(olen);
1403                 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1404         }
1405         if (tlv == NULL ||
1406             tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1407                                             TLS_EXT_PAC_OPAQUE,
1408                                             tlv, tlv_len) < 0) {
1409                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1410                            "extension");
1411                 os_free(tlv);
1412                 return -1;
1413         }
1414         os_free(tlv);
1415
1416         return 0;
1417 }
1418
1419
1420 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1421                                          struct eap_fast_data *data)
1422 {
1423         if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1424                                             TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1425                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1426                            "TLS extension");
1427                 return -1;
1428         }
1429         return 0;
1430 }
1431
1432
1433 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1434                                              struct eap_fast_data *data)
1435 {
1436         u8 ciphers[5];
1437         int count = 0;
1438
1439         if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1440                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1441                            "provisioning TLS cipher suites");
1442                 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1443         }
1444
1445         if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1446                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1447                            "provisioning TLS cipher suites");
1448                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1449                 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1450                 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1451         }
1452
1453         ciphers[count++] = TLS_CIPHER_NONE;
1454
1455         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1456                                            ciphers)) {
1457                 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1458                            "cipher suites for provisioning");
1459                 return -1;
1460         }
1461
1462         return 0;
1463 }
1464
1465
1466 static int eap_fast_process_start(struct eap_sm *sm,
1467                                   struct eap_fast_data *data, u8 flags,
1468                                   const u8 *pos, size_t left)
1469 {
1470         const u8 *a_id;
1471         size_t a_id_len;
1472
1473         /* EAP-FAST Version negotiation (section 3.1) */
1474         wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1475                    flags & EAP_TLS_VERSION_MASK, data->fast_version);
1476         if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1477                 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1478         wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1479                    data->fast_version);
1480
1481         a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1482         eap_fast_select_pac(data, a_id, a_id_len);
1483
1484         if (data->resuming && data->current_pac) {
1485                 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1486                            "do not add PAC-Opaque to TLS ClientHello");
1487                 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1488                         return -1;
1489         } else if (data->current_pac) {
1490                 /*
1491                  * PAC found for the A-ID and we are not resuming an old
1492                  * session, so add PAC-Opaque extension to ClientHello.
1493                  */
1494                 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1495                         return -1;
1496         } else {
1497                 /* No PAC found, so we must provision one. */
1498                 if (!data->provisioning_allowed) {
1499                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1500                                    "provisioning disabled");
1501                         return -1;
1502                 }
1503                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1504                            "starting provisioning");
1505                 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1506                     eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1507                         return -1;
1508                 data->provisioning = 1;
1509         }
1510
1511         return 0;
1512 }
1513
1514
1515 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1516                                         struct eap_method_ret *ret,
1517                                         const struct wpabuf *reqData)
1518 {
1519         const struct eap_hdr *req;
1520         size_t left;
1521         int res;
1522         u8 flags, id;
1523         struct wpabuf *resp;
1524         const u8 *pos;
1525         struct eap_fast_data *data = priv;
1526
1527         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1528                                         reqData, &left, &flags);
1529         if (pos == NULL)
1530                 return NULL;
1531
1532         req = wpabuf_head(reqData);
1533         id = req->identifier;
1534
1535         if (flags & EAP_TLS_FLAGS_START) {
1536                 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1537                         return NULL;
1538
1539                 left = 0; /* A-ID is not used in further packet processing */
1540         }
1541
1542         resp = NULL;
1543         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1544             !data->resuming) {
1545                 /* Process tunneled (encrypted) phase 2 data. */
1546                 struct wpabuf msg;
1547                 wpabuf_set(&msg, pos, left);
1548                 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1549                 if (res < 0) {
1550                         ret->methodState = METHOD_DONE;
1551                         ret->decision = DECISION_FAIL;
1552                         /*
1553                          * Ack possible Alert that may have caused failure in
1554                          * decryption.
1555                          */
1556                         res = 1;
1557                 }
1558         } else {
1559                 /* Continue processing TLS handshake (phase 1). */
1560                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1561                                                   EAP_TYPE_FAST,
1562                                                   data->fast_version, id, pos,
1563                                                   left, &resp);
1564
1565                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1566                         char cipher[80];
1567                         wpa_printf(MSG_DEBUG,
1568                                    "EAP-FAST: TLS done, proceed to Phase 2");
1569                         if (data->provisioning &&
1570                             (!(data->provisioning_allowed &
1571                                EAP_FAST_PROV_AUTH) ||
1572                              tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1573                                             cipher, sizeof(cipher)) < 0 ||
1574                              os_strstr(cipher, "ADH-") ||
1575                              os_strstr(cipher, "anon"))) {
1576                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1577                                            "anonymous (unauthenticated) "
1578                                            "provisioning");
1579                                 data->anon_provisioning = 1;
1580                         } else
1581                                 data->anon_provisioning = 0;
1582                         data->resuming = 0;
1583                         eap_fast_derive_keys(sm, data);
1584                 }
1585
1586                 if (res == 2) {
1587                         struct wpabuf msg;
1588                         /*
1589                          * Application data included in the handshake message.
1590                          */
1591                         wpabuf_free(data->pending_phase2_req);
1592                         data->pending_phase2_req = resp;
1593                         resp = NULL;
1594                         wpabuf_set(&msg, pos, left);
1595                         res = eap_fast_decrypt(sm, data, ret, req, &msg,
1596                                                &resp);
1597                 }
1598         }
1599
1600         if (res == 1) {
1601                 wpabuf_free(resp);
1602                 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1603                                               data->fast_version);
1604         }
1605
1606         return resp;
1607 }
1608
1609
1610 #if 0 /* FIX */
1611 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1612 {
1613         struct eap_fast_data *data = priv;
1614         return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1615 }
1616
1617
1618 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1619 {
1620         struct eap_fast_data *data = priv;
1621         os_free(data->key_block_p);
1622         data->key_block_p = NULL;
1623         wpabuf_free(data->pending_phase2_req);
1624         data->pending_phase2_req = NULL;
1625 }
1626
1627
1628 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1629 {
1630         struct eap_fast_data *data = priv;
1631         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1632                 os_free(data);
1633                 return NULL;
1634         }
1635         os_free(data->session_id);
1636         data->session_id = NULL;
1637         if (data->phase2_priv && data->phase2_method &&
1638             data->phase2_method->init_for_reauth)
1639                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1640         data->phase2_success = 0;
1641         data->resuming = 1;
1642         data->provisioning = 0;
1643         data->anon_provisioning = 0;
1644         data->simck_idx = 0;
1645         return priv;
1646 }
1647 #endif
1648
1649
1650 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1651                                size_t buflen, int verbose)
1652 {
1653         struct eap_fast_data *data = priv;
1654         int len, ret;
1655
1656         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1657         if (data->phase2_method) {
1658                 ret = os_snprintf(buf + len, buflen - len,
1659                                   "EAP-FAST Phase2 method=%s\n",
1660                                   data->phase2_method->name);
1661                 if (ret < 0 || (size_t) ret >= buflen - len)
1662                         return len;
1663                 len += ret;
1664         }
1665         return len;
1666 }
1667
1668
1669 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1670 {
1671         struct eap_fast_data *data = priv;
1672         return data->success;
1673 }
1674
1675
1676 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1677 {
1678         struct eap_fast_data *data = priv;
1679         u8 *key;
1680
1681         if (!data->success)
1682                 return NULL;
1683
1684         key = os_malloc(EAP_FAST_KEY_LEN);
1685         if (key == NULL)
1686                 return NULL;
1687
1688         *len = EAP_FAST_KEY_LEN;
1689         os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1690
1691         return key;
1692 }
1693
1694
1695 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1696 {
1697         struct eap_fast_data *data = priv;
1698         u8 *id;
1699
1700         if (!data->success)
1701                 return NULL;
1702
1703         id = os_malloc(data->id_len);
1704         if (id == NULL)
1705                 return NULL;
1706
1707         *len = data->id_len;
1708         os_memcpy(id, data->session_id, data->id_len);
1709
1710         return id;
1711 }
1712
1713
1714 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1715 {
1716         struct eap_fast_data *data = priv;
1717         u8 *key;
1718
1719         if (!data->success)
1720                 return NULL;
1721
1722         key = os_malloc(EAP_EMSK_LEN);
1723         if (key == NULL)
1724                 return NULL;
1725
1726         *len = EAP_EMSK_LEN;
1727         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1728
1729         return key;
1730 }
1731
1732
1733 int eap_peer_fast_register(void)
1734 {
1735         struct eap_method *eap;
1736         int ret;
1737
1738         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1739                                     EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1740         if (eap == NULL)
1741                 return -1;
1742
1743         eap->init = eap_fast_init;
1744         eap->deinit = eap_fast_deinit;
1745         eap->process = eap_fast_process;
1746         eap->isKeyAvailable = eap_fast_isKeyAvailable;
1747         eap->getKey = eap_fast_getKey;
1748         eap->getSessionId = eap_fast_get_session_id;
1749         eap->get_status = eap_fast_get_status;
1750 #if 0
1751         eap->has_reauth_data = eap_fast_has_reauth_data;
1752         eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1753         eap->init_for_reauth = eap_fast_init_for_reauth;
1754 #endif
1755         eap->get_emsk = eap_fast_get_emsk;
1756
1757         ret = eap_peer_method_register(eap);
1758         if (ret)
1759                 eap_peer_method_free(eap);
1760         return ret;
1761 }