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 *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         if (config == NULL)
 153                 return NULL;
 154
 155         data = os_zalloc(sizeof(*data));
 156         if (data == NULL)
 157                 return NULL;
 158         data->fast_version = EAP_FAST_VERSION;
 159         data->max_pac_list_len = 10;
 160
 161         if (config->phase1 && eap_fast_parse_phase1(data, config->phase1) < 0) {
 162                 eap_fast_deinit(sm, data);
 163                 return NULL;
 164         }
 165
 166         if (eap_peer_select_phase2_methods(config, "auth=",
 167                                            &data->phase2_types,
 168                                            &data->num_phase2_types) < 0) {
 169                 eap_fast_deinit(sm, data);
 170                 return NULL;
 171         }
 172
 173         data->phase2_type.vendor = EAP_VENDOR_IETF;
 174         data->phase2_type.method = EAP_TYPE_NONE;
 175
 176         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
 177                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 178                 eap_fast_deinit(sm, data);
 179                 return NULL;
 180         }
 181
 182         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 183                                                  eap_fast_session_ticket_cb,
 184                                                  data) < 0) {
 185                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 186                            "callback");
 187                 eap_fast_deinit(sm, data);
 188                 return NULL;
 189         }
 190
 191         /*
 192          * The local RADIUS server in a Cisco AP does not seem to like empty
 193          * fragments before data, so disable that workaround for CBC.
 194          * TODO: consider making this configurable
 195          */
 196         if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
 197                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
 198                            "workarounds");
 199         }
 200
 201         if (!config->pac_file) {
 202                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
 203                 eap_fast_deinit(sm, data);
 204                 return NULL;
 205         }
 206
 207         if (data->use_pac_binary_format &&
 208             eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
 209                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 210                 eap_fast_deinit(sm, data);
 211                 return NULL;
 212         }
 213
 214         if (!data->use_pac_binary_format &&
 215             eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
 216                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 217                 eap_fast_deinit(sm, data);
 218                 return NULL;
 219         }
 220         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
 221
 222         if (data->pac == NULL && !data->provisioning_allowed) {
 223                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
 224                            "provisioning disabled");
 225                 eap_fast_deinit(sm, data);
 226                 return NULL;
 227         }
 228
 229         return data;
 230 }
 231
 232
 233 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
 234 {
 235         struct eap_fast_data *data = priv;
 236         struct eap_fast_pac *pac, *prev;
 237
 238         if (data == NULL)
 239                 return;
 240         if (data->phase2_priv && data->phase2_method)
 241                 data->phase2_method->deinit(sm, data->phase2_priv);
 242         os_free(data->phase2_types);
 243         os_free(data->key_block_p);
 244         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 245
 246         pac = data->pac;
 247         prev = NULL;
 248         while (pac) {
 249                 prev = pac;
 250                 pac = pac->next;
 251                 eap_fast_free_pac(prev);
 252         }
 253         os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
 254         os_memset(data->emsk, 0, EAP_EMSK_LEN);
 255         os_free(data->session_id);
 256         wpabuf_free(data->pending_phase2_req);
 257         os_free(data);
 258 }
 259
 260
 261 static int eap_fast_derive_msk(struct eap_fast_data *data)
 262 {
 263         eap_fast_derive_eap_msk(data->simck, data->key_data);
 264         eap_fast_derive_eap_emsk(data->simck, data->emsk);
 265         data->success = 1;
 266         return 0;
 267 }
 268
 269
 270 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 271                                      struct eap_fast_data *data)
 272 {
 273         u8 *sks;
 274
 275         /* RFC 4851, Section 5.1:
 276          * Extra key material after TLS key_block: session_key_seed[40]
 277          */
 278
 279         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 280                                   EAP_FAST_SKS_LEN);
 281         if (sks == NULL) {
 282                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 283                            "session_key_seed");
 284                 return;
 285         }
 286
 287         /*
 288          * RFC 4851, Section 5.2:
 289          * S-IMCK[0] = session_key_seed
 290          */
 291         wpa_hexdump_key(MSG_DEBUG,
 292                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 293                         sks, EAP_FAST_SKS_LEN);
 294         data->simck_idx = 0;
 295         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 296         os_free(sks);
 297 }
 298
 299
 300 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 301                                              struct eap_fast_data *data)
 302 {
 303         os_free(data->key_block_p);
 304         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 305                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 306                                     "key expansion",
 307                                     sizeof(*data->key_block_p));
 308         if (data->key_block_p == NULL) {
 309                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 310                 return;
 311         }
 312         /*
 313          * RFC 4851, Section 5.2:
 314          * S-IMCK[0] = session_key_seed
 315          */
 316         wpa_hexdump_key(MSG_DEBUG,
 317                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 318                         data->key_block_p->session_key_seed,
 319                         sizeof(data->key_block_p->session_key_seed));
 320         data->simck_idx = 0;
 321         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 322                   EAP_FAST_SIMCK_LEN);
 323         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 324                         data->key_block_p->server_challenge,
 325                         sizeof(data->key_block_p->server_challenge));
 326         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 327                         data->key_block_p->client_challenge,
 328                         sizeof(data->key_block_p->client_challenge));
 329 }
 330
 331
 332 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
 333 {
 334         if (data->anon_provisioning)
 335                 eap_fast_derive_key_provisioning(sm, data);
 336         else
 337                 eap_fast_derive_key_auth(sm, data);
 338 }
 339
 340
 341 static int eap_fast_init_phase2_method(struct eap_sm *sm,
 342                                        struct eap_fast_data *data)
 343 {
 344         data->phase2_method =
 345                 eap_peer_get_eap_method(data->phase2_type.vendor,
 346                                         data->phase2_type.method);
 347         if (data->phase2_method == NULL)
 348                 return -1;
 349
 350         if (data->key_block_p) {
 351                 sm->auth_challenge = data->key_block_p->server_challenge;
 352                 sm->peer_challenge = data->key_block_p->client_challenge;
 353         }
 354         sm->init_phase2 = 1;
 355         data->phase2_priv = data->phase2_method->init(sm);
 356         sm->init_phase2 = 0;
 357         sm->auth_challenge = NULL;
 358         sm->peer_challenge = NULL;
 359
 360         return data->phase2_priv == NULL ? -1 : 0;
 361 }
 362
 363
 364 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
 365 {
 366         size_t i;
 367
 368         /* TODO: TNC with anonymous provisioning; need to require both
 369          * completed MSCHAPv2 and TNC */
 370
 371         if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
 372                 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
 373                            "during unauthenticated provisioning; reject phase2"
 374                            " type %d", type);
 375                 return -1;
 376         }
 377
 378 #ifdef EAP_TNC
 379         if (type == EAP_TYPE_TNC) {
 380                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 381                 data->phase2_type.method = EAP_TYPE_TNC;
 382                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 383                            "vendor %d method %d for TNC",
 384                            data->phase2_type.vendor,
 385                            data->phase2_type.method);
 386                 return 0;
 387         }
 388 #endif /* EAP_TNC */
 389
 390         for (i = 0; i < data->num_phase2_types; i++) {
 391                 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
 392                     data->phase2_types[i].method != type)
 393                         continue;
 394
 395                 data->phase2_type.vendor = data->phase2_types[i].vendor;
 396                 data->phase2_type.method = data->phase2_types[i].method;
 397                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 398                            "vendor %d method %d",
 399                            data->phase2_type.vendor,
 400                            data->phase2_type.method);
 401                 break;
 402         }
 403
 404         if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
 405                 return -1;
 406
 407         return 0;
 408 }
 409
 410
 411 static int eap_fast_phase2_request(struct eap_sm *sm,
 412                                    struct eap_fast_data *data,
 413                                    struct eap_method_ret *ret,
 414                                    struct eap_hdr *hdr,
 415                                    struct wpabuf **resp)
 416 {
 417         size_t len = be_to_host16(hdr->length);
 418         u8 *pos;
 419         struct eap_method_ret iret;
 420         struct eap_peer_config *config = eap_get_config(sm);
 421         struct wpabuf msg;
 422
 423         if (len <= sizeof(struct eap_hdr)) {
 424                 wpa_printf(MSG_INFO, "EAP-FAST: too short "
 425                            "Phase 2 request (len=%lu)", (unsigned long) len);
 426                 return -1;
 427         }
 428         pos = (u8 *) (hdr + 1);
 429         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
 430         if (*pos == EAP_TYPE_IDENTITY) {
 431                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 432                 return 0;
 433         }
 434
 435         if (data->phase2_priv && data->phase2_method &&
 436             *pos != data->phase2_type.method) {
 437                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
 438                            "deinitialize previous method");
 439                 data->phase2_method->deinit(sm, data->phase2_priv);
 440                 data->phase2_method = NULL;
 441                 data->phase2_priv = NULL;
 442                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 443                 data->phase2_type.method = EAP_TYPE_NONE;
 444         }
 445
 446         if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 447             data->phase2_type.method == EAP_TYPE_NONE &&
 448             eap_fast_select_phase2_method(data, *pos) < 0) {
 449                 if (eap_peer_tls_phase2_nak(data->phase2_types,
 450                                             data->num_phase2_types,
 451                                             hdr, resp))
 452                         return -1;
 453                 return 0;
 454         }
 455
 456         if ((data->phase2_priv == NULL &&
 457              eap_fast_init_phase2_method(sm, data) < 0) ||
 458             data->phase2_method == NULL) {
 459                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
 460                            "Phase 2 EAP method %d", *pos);
 461                 ret->methodState = METHOD_DONE;
 462                 ret->decision = DECISION_FAIL;
 463                 return -1;
 464         }
 465
 466         os_memset(&iret, 0, sizeof(iret));
 467         wpabuf_set(&msg, hdr, len);
 468         *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
 469                                              &msg);
 470         if (*resp == NULL ||
 471             (iret.methodState == METHOD_DONE &&
 472              iret.decision == DECISION_FAIL)) {
 473                 ret->methodState = METHOD_DONE;
 474                 ret->decision = DECISION_FAIL;
 475         } else if ((iret.methodState == METHOD_DONE ||
 476                     iret.methodState == METHOD_MAY_CONT) &&
 477                    (iret.decision == DECISION_UNCOND_SUCC ||
 478                     iret.decision == DECISION_COND_SUCC)) {
 479                 data->phase2_success = 1;
 480         }
 481
 482         if (*resp == NULL && config &&
 483             (config->pending_req_identity || config->pending_req_password ||
 484              config->pending_req_otp || config->pending_req_new_password)) {
 485                 wpabuf_free(data->pending_phase2_req);
 486                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 487         } else if (*resp == NULL)
 488                 return -1;
 489
 490         return 0;
 491 }
 492
 493
 494 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
 495 {
 496         struct wpabuf *buf;
 497         struct eap_tlv_nak_tlv *nak;
 498         buf = wpabuf_alloc(sizeof(*nak));
 499         if (buf == NULL)
 500                 return NULL;
 501         nak = wpabuf_put(buf, sizeof(*nak));
 502         nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
 503         nak->length = host_to_be16(6);
 504         nak->vendor_id = host_to_be32(vendor_id);
 505         nak->nak_type = host_to_be16(tlv_type);
 506         return buf;
 507 }
 508
 509
 510 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
 511 {
 512         struct wpabuf *buf;
 513         struct eap_tlv_intermediate_result_tlv *result;
 514         buf = wpabuf_alloc(sizeof(*result));
 515         if (buf == NULL)
 516                 return NULL;
 517         wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
 518                    intermediate ? "Intermediate " : "", status);
 519         result = wpabuf_put(buf, sizeof(*result));
 520         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 521                                         (intermediate ?
 522                                          EAP_TLV_INTERMEDIATE_RESULT_TLV :
 523                                          EAP_TLV_RESULT_TLV));
 524         result->length = host_to_be16(2);
 525         result->status = host_to_be16(status);
 526         return buf;
 527 }
 528
 529
 530 static struct wpabuf * eap_fast_tlv_pac_ack(void)
 531 {
 532         struct wpabuf *buf;
 533         struct eap_tlv_result_tlv *res;
 534         struct eap_tlv_pac_ack_tlv *ack;
 535
 536         buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
 537         if (buf == NULL)
 538                 return NULL;
 539
 540         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
 541         ack = wpabuf_put(buf, sizeof(*ack));
 542         ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
 543                                      EAP_TLV_TYPE_MANDATORY);
 544         ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
 545         ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
 546         ack->pac_len = host_to_be16(2);
 547         ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 548
 549         return buf;
 550 }
 551
 552
 553 static struct wpabuf * eap_fast_process_eap_payload_tlv(
 554         struct eap_sm *sm, struct eap_fast_data *data,
 555         struct eap_method_ret *ret,
 556         u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
 557 {
 558         struct eap_hdr *hdr;
 559         struct wpabuf *resp = NULL;
 560
 561         if (eap_payload_tlv_len < sizeof(*hdr)) {
 562                 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
 563                            "Payload TLV (len=%lu)",
 564                            (unsigned long) eap_payload_tlv_len);
 565                 return NULL;
 566         }
 567
 568         hdr = (struct eap_hdr *) eap_payload_tlv;
 569         if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
 570                 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
 571                            "EAP Payload TLV");
 572                 return NULL;
 573         }
 574
 575         if (hdr->code != EAP_CODE_REQUEST) {
 576                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
 577                            "Phase 2 EAP header", hdr->code);
 578                 return NULL;
 579         }
 580
 581         if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
 582                 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
 583                            "failed");
 584                 return NULL;
 585         }
 586
 587         return eap_fast_tlv_eap_payload(resp);
 588 }
 589
 590
 591 static int eap_fast_validate_crypto_binding(
 592         struct eap_tlv_crypto_binding_tlv *_bind)
 593 {
 594         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
 595                    "Received Version %d SubType %d",
 596                    _bind->version, _bind->received_version, _bind->subtype);
 597         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 598                     _bind->nonce, sizeof(_bind->nonce));
 599         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 600                     _bind->compound_mac, sizeof(_bind->compound_mac));
 601
 602         if (_bind->version != EAP_FAST_VERSION ||
 603             _bind->received_version != EAP_FAST_VERSION ||
 604             _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
 605                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
 606                            "Crypto-Binding TLV: Version %d "
 607                            "Received Version %d SubType %d",
 608                            _bind->version, _bind->received_version,
 609                            _bind->subtype);
 610                 return -1;
 611         }
 612
 613         return 0;
 614 }
 615
 616
 617 static void eap_fast_write_crypto_binding(
 618         struct eap_tlv_crypto_binding_tlv *rbind,
 619         struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
 620 {
 621         rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 622                                        EAP_TLV_CRYPTO_BINDING_TLV);
 623         rbind->length = host_to_be16(sizeof(*rbind) -
 624                                      sizeof(struct eap_tlv_hdr));
 625         rbind->version = EAP_FAST_VERSION;
 626         rbind->received_version = _bind->version;
 627         rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
 628         os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
 629         inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
 630         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
 631                   rbind->compound_mac);
 632
 633         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
 634                    "Received Version %d SubType %d",
 635                    rbind->version, rbind->received_version, rbind->subtype);
 636         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 637                     rbind->nonce, sizeof(rbind->nonce));
 638         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 639                     rbind->compound_mac, sizeof(rbind->compound_mac));
 640 }
 641
 642
 643 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 644                                    struct eap_fast_data *data,
 645                                    u8 *isk, size_t isk_len)
 646 {
 647         u8 *key;
 648         size_t key_len;
 649
 650         os_memset(isk, 0, isk_len);
 651
 652         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 653                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 654                            "available");
 655                 return -1;
 656         }
 657
 658         if (data->phase2_method->isKeyAvailable == NULL ||
 659             data->phase2_method->getKey == NULL)
 660                 return 0;
 661
 662         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 663             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 664                                                &key_len)) == NULL) {
 665                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 666                            "from Phase 2");
 667                 return -1;
 668         }
 669
 670         if (key_len > isk_len)
 671                 key_len = isk_len;
 672         if (key_len == 32 &&
 673             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 674             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 675                 /*
 676                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 677                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 678                  * ISK for EAP-FAST cryptobinding.
 679                  */
 680                 os_memcpy(isk, key + 16, 16);
 681                 os_memcpy(isk + 16, key, 16);
 682         } else
 683                 os_memcpy(isk, key, key_len);
 684         os_free(key);
 685
 686         return 0;
 687 }
 688
 689
 690 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
 691                             u8 *cmk)
 692 {
 693         u8 isk[32], imck[60];
 694
 695         wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
 696                    "calculation", data->simck_idx + 1);
 697
 698         /*
 699          * RFC 4851, Section 5.2:
 700          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 701          *                 MSK[j], 60)
 702          * S-IMCK[j] = first 40 octets of IMCK[j]
 703          * CMK[j] = last 20 octets of IMCK[j]
 704          */
 705
 706         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 707                 return -1;
 708         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 709         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 710                    "Inner Methods Compound Keys",
 711                    isk, sizeof(isk), imck, sizeof(imck));
 712         data->simck_idx++;
 713         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 714         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 715                         data->simck, EAP_FAST_SIMCK_LEN);
 716         os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 717         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 718                         cmk, EAP_FAST_CMK_LEN);
 719
 720         return 0;
 721 }
 722
 723
 724 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
 725 {
 726         struct eap_tlv_hdr *pac;
 727         struct eap_tlv_request_action_tlv *act;
 728         struct eap_tlv_pac_type_tlv *type;
 729
 730         act = (struct eap_tlv_request_action_tlv *) pos;
 731         act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
 732         act->length = host_to_be16(2);
 733         act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
 734
 735         pac = (struct eap_tlv_hdr *) (act + 1);
 736         pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
 737         pac->length = host_to_be16(sizeof(*type));
 738
 739         type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
 740         type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
 741         type->length = host_to_be16(2);
 742         type->pac_type = host_to_be16(pac_type);
 743
 744         return (u8 *) (type + 1);
 745 }
 746
 747
 748 static struct wpabuf * eap_fast_process_crypto_binding(
 749         struct eap_sm *sm, struct eap_fast_data *data,
 750         struct eap_method_ret *ret,
 751         struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
 752 {
 753         struct wpabuf *resp;
 754         u8 *pos;
 755         u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
 756         int res;
 757         size_t len;
 758
 759         if (eap_fast_validate_crypto_binding(_bind) < 0)
 760                 return NULL;
 761
 762         if (eap_fast_get_cmk(sm, data, cmk) < 0)
 763                 return NULL;
 764
 765         /* Validate received Compound MAC */
 766         os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
 767         os_memset(_bind->compound_mac, 0, sizeof(cmac));
 768         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
 769                     "MAC calculation", (u8 *) _bind, bind_len);
 770         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
 771                   _bind->compound_mac);
 772         res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac));
 773         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
 774                     cmac, sizeof(cmac));
 775         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
 776                     _bind->compound_mac, sizeof(cmac));
 777         if (res != 0) {
 778                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
 779                 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
 780                 return NULL;
 781         }
 782
 783         /*
 784          * Compound MAC was valid, so authentication succeeded. Reply with
 785          * crypto binding to allow server to complete authentication.
 786          */
 787
 788         len = sizeof(struct eap_tlv_crypto_binding_tlv);
 789         resp = wpabuf_alloc(len);
 790         if (resp == NULL)
 791                 return NULL;
 792
 793         if (!data->anon_provisioning && data->phase2_success &&
 794             eap_fast_derive_msk(data) < 0) {
 795                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
 796                 ret->methodState = METHOD_DONE;
 797                 ret->decision = DECISION_FAIL;
 798                 data->phase2_success = 0;
 799                 wpabuf_free(resp);
 800                 return NULL;
 801         }
 802
 803         if (!data->anon_provisioning && data->phase2_success) {
 804                 os_free(data->session_id);
 805                 data->session_id = eap_peer_tls_derive_session_id(
 806                         sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
 807                 if (data->session_id) {
 808                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
 809                                     data->session_id, data->id_len);
 810                 } else {
 811                         wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
 812                                    "Session-Id");
 813                         wpabuf_free(resp);
 814                         return NULL;
 815                 }
 816         }
 817
 818         pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
 819         eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
 820                                       pos, _bind, cmk);
 821
 822         return resp;
 823 }
 824
 825
 826 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
 827                                    u8 *pos, size_t len, int *pac_key_found)
 828 {
 829         switch (type & 0x7fff) {
 830         case PAC_TYPE_PAC_KEY:
 831                 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
 832                 if (len != EAP_FAST_PAC_KEY_LEN) {
 833                         wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
 834                                    "length %lu", (unsigned long) len);
 835                         break;
 836                 }
 837                 *pac_key_found = 1;
 838                 os_memcpy(entry->pac_key, pos, len);
 839                 break;
 840         case PAC_TYPE_PAC_OPAQUE:
 841                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
 842                 entry->pac_opaque = pos;
 843                 entry->pac_opaque_len = len;
 844                 break;
 845         case PAC_TYPE_PAC_INFO:
 846                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
 847                 entry->pac_info = pos;
 848                 entry->pac_info_len = len;
 849                 break;
 850         default:
 851                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
 852                            type);
 853                 break;
 854         }
 855 }
 856
 857
 858 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
 859                                     u8 *pac, size_t pac_len)
 860 {
 861         struct pac_tlv_hdr *hdr;
 862         u8 *pos;
 863         size_t left, len;
 864         int type, pac_key_found = 0;
 865
 866         pos = pac;
 867         left = pac_len;
 868
 869         while (left > sizeof(*hdr)) {
 870                 hdr = (struct pac_tlv_hdr *) pos;
 871                 type = be_to_host16(hdr->type);
 872                 len = be_to_host16(hdr->len);
 873                 pos += sizeof(*hdr);
 874                 left -= sizeof(*hdr);
 875                 if (len > left) {
 876                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
 877                                    "(type=%d len=%lu left=%lu)",
 878                                    type, (unsigned long) len,
 879                                    (unsigned long) left);
 880                         return -1;
 881                 }
 882
 883                 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
 884
 885                 pos += len;
 886                 left -= len;
 887         }
 888
 889         if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
 890                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
 891                            "all the required fields");
 892                 return -1;
 893         }
 894
 895         return 0;
 896 }
 897
 898
 899 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
 900                                    u8 *pos, size_t len)
 901 {
 902         u16 pac_type;
 903         u32 lifetime;
 904         struct os_time now;
 905
 906         switch (type & 0x7fff) {
 907         case PAC_TYPE_CRED_LIFETIME:
 908                 if (len != 4) {
 909                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
 910                                     "Invalid CRED_LIFETIME length - ignored",
 911                                     pos, len);
 912                         return 0;
 913                 }
 914
 915                 /*
 916                  * This is not currently saved separately in PAC files since
 917                  * the server can automatically initiate PAC update when
 918                  * needed. Anyway, the information is available from PAC-Info
 919                  * dump if it is needed for something in the future.
 920                  */
 921                 lifetime = WPA_GET_BE32(pos);
 922                 os_get_time(&now);
 923                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
 924                            "(%d days)",
 925                            lifetime, (lifetime - (u32) now.sec) / 86400);
 926                 break;
 927         case PAC_TYPE_A_ID:
 928                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
 929                                   pos, len);
 930                 entry->a_id = pos;
 931                 entry->a_id_len = len;
 932                 break;
 933         case PAC_TYPE_I_ID:
 934                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
 935                                   pos, len);
 936                 entry->i_id = pos;
 937                 entry->i_id_len = len;
 938                 break;
 939         case PAC_TYPE_A_ID_INFO:
 940                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
 941                                   pos, len);
 942                 entry->a_id_info = pos;
 943                 entry->a_id_info_len = len;
 944                 break;
 945         case PAC_TYPE_PAC_TYPE:
 946                 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
 947                 if (len != 2) {
 948                         wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
 949                                    "length %lu (expected 2)",
 950                                    (unsigned long) len);
 951                         wpa_hexdump_ascii(MSG_DEBUG,
 952                                           "EAP-FAST: PAC-Info - PAC-Type",
 953                                           pos, len);
 954                         return -1;
 955                 }
 956                 pac_type = WPA_GET_BE16(pos);
 957                 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
 958                     pac_type != PAC_TYPE_USER_AUTHORIZATION &&
 959                     pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
 960                         wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
 961                                    "%d", pac_type);
 962                         return -1;
 963                 }
 964
 965                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
 966                            pac_type);
 967                 entry->pac_type = pac_type;
 968                 break;
 969         default:
 970                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
 971                            "type %d", type);
 972                 break;
 973         }
 974
 975         return 0;
 976 }
 977
 978
 979 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
 980 {
 981         struct pac_tlv_hdr *hdr;
 982         u8 *pos;
 983         size_t left, len;
 984         int type;
 985
 986         /* RFC 5422, Section 4.2.4 */
 987
 988         /* PAC-Type defaults to Tunnel PAC (Type 1) */
 989         entry->pac_type = PAC_TYPE_TUNNEL_PAC;
 990
 991         pos = entry->pac_info;
 992         left = entry->pac_info_len;
 993         while (left > sizeof(*hdr)) {
 994                 hdr = (struct pac_tlv_hdr *) pos;
 995                 type = be_to_host16(hdr->type);
 996                 len = be_to_host16(hdr->len);
 997                 pos += sizeof(*hdr);
 998                 left -= sizeof(*hdr);
 999                 if (len > left) {
1000                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
1001                                    "(type=%d len=%lu left=%lu)",
1002                                    type, (unsigned long) len,
1003                                    (unsigned long) left);
1004                         return -1;
1005                 }
1006
1007                 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
1008                         return -1;
1009
1010                 pos += len;
1011                 left -= len;
1012         }
1013
1014         if (entry->a_id == NULL || entry->a_id_info == NULL) {
1015                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1016                            "all the required fields");
1017                 return -1;
1018         }
1019
1020         return 0;
1021 }
1022
1023
1024 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1025                                             struct eap_fast_data *data,
1026                                             struct eap_method_ret *ret,
1027                                             u8 *pac, size_t pac_len)
1028 {
1029         struct eap_peer_config *config = eap_get_config(sm);
1030         struct eap_fast_pac entry;
1031
1032         os_memset(&entry, 0, sizeof(entry));
1033         if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1034             eap_fast_process_pac_info(&entry))
1035                 return NULL;
1036
1037         eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1038         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1039         if (data->use_pac_binary_format)
1040                 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1041         else
1042                 eap_fast_save_pac(sm, data->pac, config->pac_file);
1043
1044         if (data->provisioning) {
1045                 if (data->anon_provisioning) {
1046                         /*
1047                          * Unauthenticated provisioning does not provide keying
1048                          * material and must end with an EAP-Failure.
1049                          * Authentication will be done separately after this.
1050                          */
1051                         data->success = 0;
1052                         ret->decision = DECISION_FAIL;
1053                 } else {
1054                         /*
1055                          * Server may or may not allow authenticated
1056                          * provisioning also for key generation.
1057                          */
1058                         ret->decision = DECISION_COND_SUCC;
1059                 }
1060                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1061                            "- Provisioning completed successfully");
1062                 sm->expected_failure = 1;
1063         } else {
1064                 /*
1065                  * This is PAC refreshing, i.e., normal authentication that is
1066                  * expected to be completed with an EAP-Success. However,
1067                  * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1068                  * after protected success exchange in case of EAP-Fast
1069                  * provisioning, so we better use DECISION_COND_SUCC here
1070                  * instead of DECISION_UNCOND_SUCC.
1071                  */
1072                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1073                            "- PAC refreshing completed successfully");
1074                 ret->decision = DECISION_COND_SUCC;
1075         }
1076         ret->methodState = METHOD_DONE;
1077         return eap_fast_tlv_pac_ack();
1078 }
1079
1080
1081 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1082                                     struct eap_fast_tlv_parse *tlv,
1083                                     struct wpabuf **resp)
1084 {
1085         int mandatory, tlv_type, res;
1086         size_t len;
1087         u8 *pos, *end;
1088
1089         os_memset(tlv, 0, sizeof(*tlv));
1090
1091         /* Parse TLVs from the decrypted Phase 2 data */
1092         pos = wpabuf_mhead(decrypted);
1093         end = pos + wpabuf_len(decrypted);
1094         while (pos + 4 < end) {
1095                 mandatory = pos[0] & 0x80;
1096                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1097                 pos += 2;
1098                 len = WPA_GET_BE16(pos);
1099                 pos += 2;
1100                 if (len > (size_t) (end - pos)) {
1101                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1102                         return -1;
1103                 }
1104                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1105                            "TLV type %d length %u%s",
1106                            tlv_type, (unsigned int) len,
1107                            mandatory ? " (mandatory)" : "");
1108
1109                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1110                 if (res == -2)
1111                         break;
1112                 if (res < 0) {
1113                         if (mandatory) {
1114                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1115                                            "mandatory TLV type %d", tlv_type);
1116                                 *resp = eap_fast_tlv_nak(0, tlv_type);
1117                                 break;
1118                         } else {
1119                                 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1120                                            "unknown optional TLV type %d",
1121                                            tlv_type);
1122                         }
1123                 }
1124
1125                 pos += len;
1126         }
1127
1128         return 0;
1129 }
1130
1131
1132 static int eap_fast_encrypt_response(struct eap_sm *sm,
1133                                      struct eap_fast_data *data,
1134                                      struct wpabuf *resp,
1135                                      u8 identifier, struct wpabuf **out_data)
1136 {
1137         if (resp == NULL)
1138                 return 0;
1139
1140         wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1141                         resp);
1142         if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1143                                  data->fast_version, identifier,
1144                                  resp, out_data)) {
1145                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1146                            "frame");
1147         }
1148         wpabuf_free(resp);
1149
1150         return 0;
1151 }
1152
1153
1154 static struct wpabuf * eap_fast_pac_request(void)
1155 {
1156         struct wpabuf *tmp;
1157         u8 *pos, *pos2;
1158
1159         tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1160                            sizeof(struct eap_tlv_request_action_tlv) +
1161                            sizeof(struct eap_tlv_pac_type_tlv));
1162         if (tmp == NULL)
1163                 return NULL;
1164
1165         pos = wpabuf_put(tmp, 0);
1166         pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1167         wpabuf_put(tmp, pos2 - pos);
1168         return tmp;
1169 }
1170
1171
1172 static int eap_fast_process_decrypted(struct eap_sm *sm,
1173                                       struct eap_fast_data *data,
1174                                       struct eap_method_ret *ret,
1175                                       const struct eap_hdr *req,
1176                                       struct wpabuf *decrypted,
1177                                       struct wpabuf **out_data)
1178 {
1179         struct wpabuf *resp = NULL, *tmp;
1180         struct eap_fast_tlv_parse tlv;
1181         int failed = 0;
1182
1183         if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1184                 return 0;
1185         if (resp)
1186                 return eap_fast_encrypt_response(sm, data, resp,
1187                                                  req->identifier, out_data);
1188
1189         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1190                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1191                 return eap_fast_encrypt_response(sm, data, resp,
1192                                                  req->identifier, out_data);
1193         }
1194
1195         if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1196                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1197                 return eap_fast_encrypt_response(sm, data, resp,
1198                                                  req->identifier, out_data);
1199         }
1200
1201         if (tlv.crypto_binding) {
1202                 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1203                                                       tlv.crypto_binding,
1204                                                       tlv.crypto_binding_len);
1205                 if (tmp == NULL)
1206                         failed = 1;
1207                 else
1208                         resp = wpabuf_concat(resp, tmp);
1209         }
1210
1211         if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1212                 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1213                                           EAP_TLV_RESULT_SUCCESS, 1);
1214                 resp = wpabuf_concat(resp, tmp);
1215         }
1216
1217         if (tlv.eap_payload_tlv) {
1218                 tmp = eap_fast_process_eap_payload_tlv(
1219                         sm, data, ret, tlv.eap_payload_tlv,
1220                         tlv.eap_payload_tlv_len);
1221                 resp = wpabuf_concat(resp, tmp);
1222         }
1223
1224         if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1225                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1226                            "acknowledging success");
1227                 failed = 1;
1228         } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1229                 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1230                                            tlv.pac_len);
1231                 resp = wpabuf_concat(resp, tmp);
1232         }
1233
1234         if (data->current_pac == NULL && data->provisioning &&
1235             !data->anon_provisioning && !tlv.pac &&
1236             (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1237              tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1238                 /*
1239                  * Need to request Tunnel PAC when using authenticated
1240                  * provisioning.
1241                  */
1242                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1243                 tmp = eap_fast_pac_request();
1244                 resp = wpabuf_concat(resp, tmp);
1245         }
1246
1247         if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1248                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1249                 resp = wpabuf_concat(tmp, resp);
1250         } else if (failed) {
1251                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1252                 resp = wpabuf_concat(tmp, resp);
1253         }
1254
1255         if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1256             tlv.crypto_binding && data->phase2_success) {
1257                 if (data->anon_provisioning) {
1258                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1259                                    "provisioning completed successfully.");
1260                         ret->methodState = METHOD_DONE;
1261                         ret->decision = DECISION_FAIL;
1262                         sm->expected_failure = 1;
1263                 } else {
1264                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1265                                    "completed successfully.");
1266                         if (data->provisioning)
1267                                 ret->methodState = METHOD_MAY_CONT;
1268                         else
1269                                 ret->methodState = METHOD_DONE;
1270                         ret->decision = DECISION_UNCOND_SUCC;
1271                 }
1272         }
1273
1274         if (resp == NULL) {
1275                 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1276                            "empty response packet");
1277                 resp = wpabuf_alloc(1);
1278         }
1279
1280         return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1281                                          out_data);
1282 }
1283
1284
1285 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1286                             struct eap_method_ret *ret,
1287                             const struct eap_hdr *req,
1288                             const struct wpabuf *in_data,
1289                             struct wpabuf **out_data)
1290 {
1291         struct wpabuf *in_decrypted;
1292         int res;
1293
1294         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1295                    " Phase 2", (unsigned long) wpabuf_len(in_data));
1296
1297         if (data->pending_phase2_req) {
1298                 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1299                            "skip decryption and use old data");
1300                 /* Clear TLS reassembly state. */
1301                 eap_peer_tls_reset_input(&data->ssl);
1302
1303                 in_decrypted = data->pending_phase2_req;
1304                 data->pending_phase2_req = NULL;
1305                 goto continue_req;
1306         }
1307
1308         if (wpabuf_len(in_data) == 0) {
1309                 /* Received TLS ACK - requesting more fragments */
1310                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1311                                             data->fast_version,
1312                                             req->identifier, NULL, out_data);
1313         }
1314
1315         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1316         if (res)
1317                 return res;
1318
1319 continue_req:
1320         wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1321                         in_decrypted);
1322
1323         if (wpabuf_len(in_decrypted) < 4) {
1324                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1325                            "TLV frame (len=%lu)",
1326                            (unsigned long) wpabuf_len(in_decrypted));
1327                 wpabuf_free(in_decrypted);
1328                 return -1;
1329         }
1330
1331         res = eap_fast_process_decrypted(sm, data, ret, req,
1332                                          in_decrypted, out_data);
1333
1334         wpabuf_free(in_decrypted);
1335
1336         return res;
1337 }
1338
1339
1340 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1341 {
1342         const u8 *a_id;
1343         struct pac_tlv_hdr *hdr;
1344
1345         /*
1346          * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1347          * supports both raw A-ID and one inside an A-ID TLV.
1348          */
1349         a_id = buf;
1350         *id_len = len;
1351         if (len > sizeof(*hdr)) {
1352                 int tlen;
1353                 hdr = (struct pac_tlv_hdr *) buf;
1354                 tlen = be_to_host16(hdr->len);
1355                 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1356                     sizeof(*hdr) + tlen <= len) {
1357                         wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1358                                    "(Start)");
1359                         a_id = (u8 *) (hdr + 1);
1360                         *id_len = tlen;
1361                 }
1362         }
1363         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1364
1365         return a_id;
1366 }
1367
1368
1369 static void eap_fast_select_pac(struct eap_fast_data *data,
1370                                 const u8 *a_id, size_t a_id_len)
1371 {
1372         data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1373                                              PAC_TYPE_TUNNEL_PAC);
1374         if (data->current_pac == NULL) {
1375                 /*
1376                  * Tunnel PAC was not available for this A-ID. Try to use
1377                  * Machine Authentication PAC, if one is available.
1378                  */
1379                 data->current_pac = eap_fast_get_pac(
1380                         data->pac, a_id, a_id_len,
1381                         PAC_TYPE_MACHINE_AUTHENTICATION);
1382         }
1383
1384         if (data->current_pac) {
1385                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1386                            "(PAC-Type %d)", data->current_pac->pac_type);
1387                 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1388                                   data->current_pac->a_id_info,
1389                                   data->current_pac->a_id_info_len);
1390         }
1391 }
1392
1393
1394 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1395                                    struct eap_fast_data *data,
1396                                    struct eap_fast_pac *pac)
1397 {
1398         u8 *tlv;
1399         size_t tlv_len, olen;
1400         struct eap_tlv_hdr *ehdr;
1401
1402         olen = pac->pac_opaque_len;
1403         tlv_len = sizeof(*ehdr) + olen;
1404         tlv = os_malloc(tlv_len);
1405         if (tlv) {
1406                 ehdr = (struct eap_tlv_hdr *) tlv;
1407                 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1408                 ehdr->length = host_to_be16(olen);
1409                 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1410         }
1411         if (tlv == NULL ||
1412             tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1413                                             TLS_EXT_PAC_OPAQUE,
1414                                             tlv, tlv_len) < 0) {
1415                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1416                            "extension");
1417                 os_free(tlv);
1418                 return -1;
1419         }
1420         os_free(tlv);
1421
1422         return 0;
1423 }
1424
1425
1426 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1427                                          struct eap_fast_data *data)
1428 {
1429         if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1430                                             TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1431                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1432                            "TLS extension");
1433                 return -1;
1434         }
1435         return 0;
1436 }
1437
1438
1439 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1440                                              struct eap_fast_data *data)
1441 {
1442         u8 ciphers[5];
1443         int count = 0;
1444
1445         if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1446                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1447                            "provisioning TLS cipher suites");
1448                 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1449         }
1450
1451         if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1452                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1453                            "provisioning TLS cipher suites");
1454                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1455                 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1456                 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1457         }
1458
1459         ciphers[count++] = TLS_CIPHER_NONE;
1460
1461         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1462                                            ciphers)) {
1463                 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1464                            "cipher suites for provisioning");
1465                 return -1;
1466         }
1467
1468         return 0;
1469 }
1470
1471
1472 static int eap_fast_process_start(struct eap_sm *sm,
1473                                   struct eap_fast_data *data, u8 flags,
1474                                   const u8 *pos, size_t left)
1475 {
1476         const u8 *a_id;
1477         size_t a_id_len;
1478
1479         /* EAP-FAST Version negotiation (section 3.1) */
1480         wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1481                    flags & EAP_TLS_VERSION_MASK, data->fast_version);
1482         if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1483                 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1484         wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1485                    data->fast_version);
1486
1487         a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1488         eap_fast_select_pac(data, a_id, a_id_len);
1489
1490         if (data->resuming && data->current_pac) {
1491                 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1492                            "do not add PAC-Opaque to TLS ClientHello");
1493                 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1494                         return -1;
1495         } else if (data->current_pac) {
1496                 /*
1497                  * PAC found for the A-ID and we are not resuming an old
1498                  * session, so add PAC-Opaque extension to ClientHello.
1499                  */
1500                 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1501                         return -1;
1502         } else {
1503                 /* No PAC found, so we must provision one. */
1504                 if (!data->provisioning_allowed) {
1505                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1506                                    "provisioning disabled");
1507                         return -1;
1508                 }
1509                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1510                            "starting provisioning");
1511                 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1512                     eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1513                         return -1;
1514                 data->provisioning = 1;
1515         }
1516
1517         return 0;
1518 }
1519
1520
1521 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1522                                         struct eap_method_ret *ret,
1523                                         const struct wpabuf *reqData)
1524 {
1525         const struct eap_hdr *req;
1526         size_t left;
1527         int res;
1528         u8 flags, id;
1529         struct wpabuf *resp;
1530         const u8 *pos;
1531         struct eap_fast_data *data = priv;
1532
1533         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1534                                         reqData, &left, &flags);
1535         if (pos == NULL)
1536                 return NULL;
1537
1538         req = wpabuf_head(reqData);
1539         id = req->identifier;
1540
1541         if (flags & EAP_TLS_FLAGS_START) {
1542                 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1543                         return NULL;
1544
1545                 left = 0; /* A-ID is not used in further packet processing */
1546         }
1547
1548         resp = NULL;
1549         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1550             !data->resuming) {
1551                 /* Process tunneled (encrypted) phase 2 data. */
1552                 struct wpabuf msg;
1553                 wpabuf_set(&msg, pos, left);
1554                 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1555                 if (res < 0) {
1556                         ret->methodState = METHOD_DONE;
1557                         ret->decision = DECISION_FAIL;
1558                         /*
1559                          * Ack possible Alert that may have caused failure in
1560                          * decryption.
1561                          */
1562                         res = 1;
1563                 }
1564         } else {
1565                 /* Continue processing TLS handshake (phase 1). */
1566                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1567                                                   EAP_TYPE_FAST,
1568                                                   data->fast_version, id, pos,
1569                                                   left, &resp);
1570
1571                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1572                         char cipher[80];
1573                         wpa_printf(MSG_DEBUG,
1574                                    "EAP-FAST: TLS done, proceed to Phase 2");
1575                         if (data->provisioning &&
1576                             (!(data->provisioning_allowed &
1577                                EAP_FAST_PROV_AUTH) ||
1578                              tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1579                                             cipher, sizeof(cipher)) < 0 ||
1580                              os_strstr(cipher, "ADH-") ||
1581                              os_strstr(cipher, "anon"))) {
1582                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1583                                            "anonymous (unauthenticated) "
1584                                            "provisioning");
1585                                 data->anon_provisioning = 1;
1586                         } else
1587                                 data->anon_provisioning = 0;
1588                         data->resuming = 0;
1589                         eap_fast_derive_keys(sm, data);
1590                 }
1591
1592                 if (res == 2) {
1593                         struct wpabuf msg;
1594                         /*
1595                          * Application data included in the handshake message.
1596                          */
1597                         wpabuf_free(data->pending_phase2_req);
1598                         data->pending_phase2_req = resp;
1599                         resp = NULL;
1600                         wpabuf_set(&msg, pos, left);
1601                         res = eap_fast_decrypt(sm, data, ret, req, &msg,
1602                                                &resp);
1603                 }
1604         }
1605
1606         if (res == 1) {
1607                 wpabuf_free(resp);
1608                 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1609                                               data->fast_version);
1610         }
1611
1612         return resp;
1613 }
1614
1615
1616 #if 0 /* FIX */
1617 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1618 {
1619         struct eap_fast_data *data = priv;
1620         return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1621 }
1622
1623
1624 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1625 {
1626         struct eap_fast_data *data = priv;
1627         os_free(data->key_block_p);
1628         data->key_block_p = NULL;
1629         wpabuf_free(data->pending_phase2_req);
1630         data->pending_phase2_req = NULL;
1631 }
1632
1633
1634 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1635 {
1636         struct eap_fast_data *data = priv;
1637         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1638                 os_free(data);
1639                 return NULL;
1640         }
1641         os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
1642         os_memset(data->emsk, 0, EAP_EMSK_LEN);
1643         os_free(data->session_id);
1644         data->session_id = NULL;
1645         if (data->phase2_priv && data->phase2_method &&
1646             data->phase2_method->init_for_reauth)
1647                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1648         data->phase2_success = 0;
1649         data->resuming = 1;
1650         data->provisioning = 0;
1651         data->anon_provisioning = 0;
1652         data->simck_idx = 0;
1653         return priv;
1654 }
1655 #endif
1656
1657
1658 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1659                                size_t buflen, int verbose)
1660 {
1661         struct eap_fast_data *data = priv;
1662         int len, ret;
1663
1664         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1665         if (data->phase2_method) {
1666                 ret = os_snprintf(buf + len, buflen - len,
1667                                   "EAP-FAST Phase2 method=%s\n",
1668                                   data->phase2_method->name);
1669                 if (os_snprintf_error(buflen - len, ret))
1670                         return len;
1671                 len += ret;
1672         }
1673         return len;
1674 }
1675
1676
1677 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1678 {
1679         struct eap_fast_data *data = priv;
1680         return data->success;
1681 }
1682
1683
1684 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1685 {
1686         struct eap_fast_data *data = priv;
1687         u8 *key;
1688
1689         if (!data->success)
1690                 return NULL;
1691
1692         key = os_malloc(EAP_FAST_KEY_LEN);
1693         if (key == NULL)
1694                 return NULL;
1695
1696         *len = EAP_FAST_KEY_LEN;
1697         os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1698
1699         return key;
1700 }
1701
1702
1703 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1704 {
1705         struct eap_fast_data *data = priv;
1706         u8 *id;
1707
1708         if (!data->success)
1709                 return NULL;
1710
1711         id = os_malloc(data->id_len);
1712         if (id == NULL)
1713                 return NULL;
1714
1715         *len = data->id_len;
1716         os_memcpy(id, data->session_id, data->id_len);
1717
1718         return id;
1719 }
1720
1721
1722 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1723 {
1724         struct eap_fast_data *data = priv;
1725         u8 *key;
1726
1727         if (!data->success)
1728                 return NULL;
1729
1730         key = os_malloc(EAP_EMSK_LEN);
1731         if (key == NULL)
1732                 return NULL;
1733
1734         *len = EAP_EMSK_LEN;
1735         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1736
1737         return key;
1738 }
1739
1740
1741 int eap_peer_fast_register(void)
1742 {
1743         struct eap_method *eap;
1744         int ret;
1745
1746         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1747                                     EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1748         if (eap == NULL)
1749                 return -1;
1750
1751         eap->init = eap_fast_init;
1752         eap->deinit = eap_fast_deinit;
1753         eap->process = eap_fast_process;
1754         eap->isKeyAvailable = eap_fast_isKeyAvailable;
1755         eap->getKey = eap_fast_getKey;
1756         eap->getSessionId = eap_fast_get_session_id;
1757         eap->get_status = eap_fast_get_status;
1758 #if 0
1759         eap->has_reauth_data = eap_fast_has_reauth_data;
1760         eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1761         eap->init_for_reauth = eap_fast_init_for_reauth;
1762 #endif
1763         eap->get_emsk = eap_fast_get_emsk;
1764
1765         ret = eap_peer_method_register(eap);
1766         if (ret)
1767                 eap_peer_method_free(eap);
1768         return ret;
1769 }