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 program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "eap_i.h"
  19 #include "eap_tls_common.h"
  20 #include "eap_config.h"
  21 #include "tls.h"
  22 #include "eap_common/eap_tlv_common.h"
  23 #include "sha1.h"
  24 #include "eap_fast_pac.h"
  25
  26 #ifdef EAP_FAST_DYNAMIC
  27 #include "eap_fast_pac.c"
  28 #endif /* EAP_FAST_DYNAMIC */
  29
  30 /* TODO:
  31  * - test session resumption and enable it if it interoperates
  32  * - password change (pending mschapv2 packet; replay decrypted packet)
  33  */
  34
  35
  36 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
  37
  38
  39 struct eap_fast_data {
  40         struct eap_ssl_data ssl;
  41
  42         int fast_version;
  43
  44         const struct eap_method *phase2_method;
  45         void *phase2_priv;
  46         int phase2_success;
  47
  48         struct eap_method_type phase2_type;
  49         struct eap_method_type *phase2_types;
  50         size_t num_phase2_types;
  51         int resuming; /* starting a resumed session */
  52         struct eap_fast_key_block_provisioning *key_block_p;
  53 #define EAP_FAST_PROV_UNAUTH 1
  54 #define EAP_FAST_PROV_AUTH 2
  55         int provisioning_allowed; /* Allowed PAC provisioning modes */
  56         int provisioning; /* doing PAC provisioning (not the normal auth) */
  57         int anon_provisioning; /* doing anonymous (unauthenticated)
  58                                 * provisioning */
  59         int session_ticket_used;
  60
  61         u8 key_data[EAP_FAST_KEY_LEN];
  62         u8 emsk[EAP_EMSK_LEN];
  63         int success;
  64
  65         struct eap_fast_pac *pac;
  66         struct eap_fast_pac *current_pac;
  67         size_t max_pac_list_len;
  68         int use_pac_binary_format;
  69
  70         u8 simck[EAP_FAST_SIMCK_LEN];
  71         int simck_idx;
  72
  73         struct wpabuf *pending_phase2_req;
  74 };
  75
  76
  77 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
  78                                       const u8 *client_random,
  79                                       const u8 *server_random,
  80                                       u8 *master_secret)
  81 {
  82         struct eap_fast_data *data = ctx;
  83
  84         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
  85
  86         if (client_random == NULL || server_random == NULL ||
  87             master_secret == NULL) {
  88                 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
  89                            "back to full TLS handshake");
  90                 data->session_ticket_used = 0;
  91                 if (data->provisioning_allowed) {
  92                         wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
  93                                    "new PAC-Key");
  94                         data->provisioning = 1;
  95                         data->current_pac = NULL;
  96                 }
  97                 return 0;
  98         }
  99
 100         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
 101
 102         if (data->current_pac == NULL) {
 103                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
 104                            "using SessionTicket");
 105                 data->session_ticket_used = 0;
 106                 return 0;
 107         }
 108
 109         eap_fast_derive_master_secret(data->current_pac->pac_key,
 110                                       server_random, client_random,
 111                                       master_secret);
 112
 113         data->session_ticket_used = 1;
 114
 115         return 1;
 116 }
 117
 118
 119 static int eap_fast_parse_phase1(struct eap_fast_data *data,
 120                                  const char *phase1)
 121 {
 122         const char *pos;
 123
 124         pos = os_strstr(phase1, "fast_provisioning=");
 125         if (pos) {
 126                 data->provisioning_allowed = atoi(pos + 18);
 127                 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
 128                            "mode: %d", data->provisioning_allowed);
 129         }
 130
 131         pos = os_strstr(phase1, "fast_max_pac_list_len=");
 132         if (pos) {
 133                 data->max_pac_list_len = atoi(pos + 22);
 134                 if (data->max_pac_list_len == 0)
 135                         data->max_pac_list_len = 1;
 136                 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
 137                            (unsigned long) data->max_pac_list_len);
 138         }
 139
 140         pos = os_strstr(phase1, "fast_pac_format=binary");
 141         if (pos) {
 142                 data->use_pac_binary_format = 1;
 143                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
 144                            "list");
 145         }
 146
 147         return 0;
 148 }
 149
 150
 151 static void * eap_fast_init(struct eap_sm *sm)
 152 {
 153         struct eap_fast_data *data;
 154         struct eap_peer_config *config = eap_get_config(sm);
 155
 156         data = os_zalloc(sizeof(*data));
 157         if (data == NULL)
 158                 return NULL;
 159         data->fast_version = EAP_FAST_VERSION;
 160         data->max_pac_list_len = 10;
 161
 162         if (config && config->phase1 &&
 163             eap_fast_parse_phase1(data, config->phase1) < 0) {
 164                 eap_fast_deinit(sm, data);
 165                 return NULL;
 166         }
 167
 168         if (eap_peer_select_phase2_methods(config, "auth=",
 169                                            &data->phase2_types,
 170                                            &data->num_phase2_types) < 0) {
 171                 eap_fast_deinit(sm, data);
 172                 return NULL;
 173         }
 174
 175         data->phase2_type.vendor = EAP_VENDOR_IETF;
 176         data->phase2_type.method = EAP_TYPE_NONE;
 177
 178         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
 179                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 180                 eap_fast_deinit(sm, data);
 181                 return NULL;
 182         }
 183
 184         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 185                                                  eap_fast_session_ticket_cb,
 186                                                  data) < 0) {
 187                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 188                            "callback");
 189                 eap_fast_deinit(sm, data);
 190                 return NULL;
 191         }
 192
 193         /*
 194          * The local RADIUS server in a Cisco AP does not seem to like empty
 195          * fragments before data, so disable that workaround for CBC.
 196          * TODO: consider making this configurable
 197          */
 198         if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
 199                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
 200                            "workarounds");
 201         }
 202
 203         if (data->use_pac_binary_format &&
 204             eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
 205                 eap_fast_deinit(sm, data);
 206                 return NULL;
 207         }
 208
 209         if (!data->use_pac_binary_format &&
 210             eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
 211                 eap_fast_deinit(sm, data);
 212                 return NULL;
 213         }
 214         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
 215
 216         if (data->pac == NULL && !data->provisioning_allowed) {
 217                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
 218                            "provisioning disabled");
 219                 eap_fast_deinit(sm, data);
 220                 return NULL;
 221         }
 222
 223         return data;
 224 }
 225
 226
 227 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
 228 {
 229         struct eap_fast_data *data = priv;
 230         struct eap_fast_pac *pac, *prev;
 231
 232         if (data == NULL)
 233                 return;
 234         if (data->phase2_priv && data->phase2_method)
 235                 data->phase2_method->deinit(sm, data->phase2_priv);
 236         os_free(data->phase2_types);
 237         os_free(data->key_block_p);
 238         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 239
 240         pac = data->pac;
 241         prev = NULL;
 242         while (pac) {
 243                 prev = pac;
 244                 pac = pac->next;
 245                 eap_fast_free_pac(prev);
 246         }
 247         wpabuf_free(data->pending_phase2_req);
 248         os_free(data);
 249 }
 250
 251
 252 static int eap_fast_derive_msk(struct eap_fast_data *data)
 253 {
 254         eap_fast_derive_eap_msk(data->simck, data->key_data);
 255         eap_fast_derive_eap_emsk(data->simck, data->emsk);
 256         data->success = 1;
 257         return 0;
 258 }
 259
 260
 261 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 262                                      struct eap_fast_data *data)
 263 {
 264         u8 *sks;
 265
 266         /* RFC 4851, Section 5.1:
 267          * Extra key material after TLS key_block: session_key_seed[40]
 268          */
 269
 270         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 271                                   EAP_FAST_SKS_LEN);
 272         if (sks == NULL) {
 273                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 274                            "session_key_seed");
 275                 return;
 276         }
 277
 278         /*
 279          * RFC 4851, Section 5.2:
 280          * S-IMCK[0] = session_key_seed
 281          */
 282         wpa_hexdump_key(MSG_DEBUG,
 283                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 284                         sks, EAP_FAST_SKS_LEN);
 285         data->simck_idx = 0;
 286         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 287         os_free(sks);
 288 }
 289
 290
 291 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 292                                              struct eap_fast_data *data)
 293 {
 294         os_free(data->key_block_p);
 295         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 296                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 297                                     "key expansion",
 298                                     sizeof(*data->key_block_p));
 299         if (data->key_block_p == NULL) {
 300                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 301                 return;
 302         }
 303         /*
 304          * RFC 4851, Section 5.2:
 305          * S-IMCK[0] = session_key_seed
 306          */
 307         wpa_hexdump_key(MSG_DEBUG,
 308                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 309                         data->key_block_p->session_key_seed,
 310                         sizeof(data->key_block_p->session_key_seed));
 311         data->simck_idx = 0;
 312         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 313                   EAP_FAST_SIMCK_LEN);
 314         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 315                         data->key_block_p->server_challenge,
 316                         sizeof(data->key_block_p->server_challenge));
 317         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 318                         data->key_block_p->client_challenge,
 319                         sizeof(data->key_block_p->client_challenge));
 320 }
 321
 322
 323 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
 324 {
 325         if (data->anon_provisioning)
 326                 eap_fast_derive_key_provisioning(sm, data);
 327         else
 328                 eap_fast_derive_key_auth(sm, data);
 329 }
 330
 331
 332 static int eap_fast_init_phase2_method(struct eap_sm *sm,
 333                                        struct eap_fast_data *data)
 334 {
 335         data->phase2_method =
 336                 eap_peer_get_eap_method(data->phase2_type.vendor,
 337                                         data->phase2_type.method);
 338         if (data->phase2_method == NULL)
 339                 return -1;
 340
 341         if (data->key_block_p) {
 342                 sm->auth_challenge = data->key_block_p->server_challenge;
 343                 sm->peer_challenge = data->key_block_p->client_challenge;
 344         }
 345         sm->init_phase2 = 1;
 346         data->phase2_priv = data->phase2_method->init(sm);
 347         sm->init_phase2 = 0;
 348         sm->auth_challenge = NULL;
 349         sm->peer_challenge = NULL;
 350
 351         return data->phase2_priv == NULL ? -1 : 0;
 352 }
 353
 354
 355 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
 356 {
 357         size_t i;
 358
 359         /* TODO: TNC with anonymous provisioning; need to require both
 360          * completed MSCHAPv2 and TNC */
 361
 362         if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
 363                 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
 364                            "during unauthenticated provisioning; reject phase2"
 365                            " type %d", type);
 366                 return -1;
 367         }
 368
 369 #ifdef EAP_TNC
 370         if (type == EAP_TYPE_TNC) {
 371                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 372                 data->phase2_type.method = EAP_TYPE_TNC;
 373                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 374                            "vendor %d method %d for TNC",
 375                            data->phase2_type.vendor,
 376                            data->phase2_type.method);
 377                 return 0;
 378         }
 379 #endif /* EAP_TNC */
 380
 381         for (i = 0; i < data->num_phase2_types; i++) {
 382                 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
 383                     data->phase2_types[i].method != type)
 384                         continue;
 385
 386                 data->phase2_type.vendor = data->phase2_types[i].vendor;
 387                 data->phase2_type.method = data->phase2_types[i].method;
 388                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 389                            "vendor %d method %d",
 390                            data->phase2_type.vendor,
 391                            data->phase2_type.method);
 392                 break;
 393         }
 394
 395         if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
 396                 return -1;
 397
 398         return 0;
 399 }
 400
 401
 402 static int eap_fast_phase2_request(struct eap_sm *sm,
 403                                    struct eap_fast_data *data,
 404                                    struct eap_method_ret *ret,
 405                                    struct eap_hdr *hdr,
 406                                    struct wpabuf **resp)
 407 {
 408         size_t len = be_to_host16(hdr->length);
 409         u8 *pos;
 410         struct eap_method_ret iret;
 411         struct eap_peer_config *config = eap_get_config(sm);
 412         struct wpabuf msg;
 413
 414         if (len <= sizeof(struct eap_hdr)) {
 415                 wpa_printf(MSG_INFO, "EAP-FAST: too short "
 416                            "Phase 2 request (len=%lu)", (unsigned long) len);
 417                 return -1;
 418         }
 419         pos = (u8 *) (hdr + 1);
 420         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
 421         if (*pos == EAP_TYPE_IDENTITY) {
 422                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 423                 return 0;
 424         }
 425
 426         if (data->phase2_priv && data->phase2_method &&
 427             *pos != data->phase2_type.method) {
 428                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
 429                            "deinitialize previous method");
 430                 data->phase2_method->deinit(sm, data->phase2_priv);
 431                 data->phase2_method = NULL;
 432                 data->phase2_priv = NULL;
 433                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 434                 data->phase2_type.method = EAP_TYPE_NONE;
 435         }
 436
 437         if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 438             data->phase2_type.method == EAP_TYPE_NONE &&
 439             eap_fast_select_phase2_method(data, *pos) < 0) {
 440                 if (eap_peer_tls_phase2_nak(data->phase2_types,
 441                                             data->num_phase2_types,
 442                                             hdr, resp))
 443                         return -1;
 444                 return 0;
 445         }
 446
 447         if (data->phase2_priv == NULL &&
 448             eap_fast_init_phase2_method(sm, data) < 0) {
 449                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
 450                            "Phase 2 EAP method %d", *pos);
 451                 ret->methodState = METHOD_DONE;
 452                 ret->decision = DECISION_FAIL;
 453                 return -1;
 454         }
 455
 456         os_memset(&iret, 0, sizeof(iret));
 457         wpabuf_set(&msg, hdr, len);
 458         *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
 459                                              &msg);
 460         if (*resp == NULL ||
 461             (iret.methodState == METHOD_DONE &&
 462              iret.decision == DECISION_FAIL)) {
 463                 ret->methodState = METHOD_DONE;
 464                 ret->decision = DECISION_FAIL;
 465         } else if ((iret.methodState == METHOD_DONE ||
 466                     iret.methodState == METHOD_MAY_CONT) &&
 467                    (iret.decision == DECISION_UNCOND_SUCC ||
 468                     iret.decision == DECISION_COND_SUCC)) {
 469                 data->phase2_success = 1;
 470         }
 471
 472         if (*resp == NULL && config &&
 473             (config->pending_req_identity || config->pending_req_password ||
 474              config->pending_req_otp || config->pending_req_new_password)) {
 475                 wpabuf_free(data->pending_phase2_req);
 476                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 477         } else if (*resp == NULL)
 478                 return -1;
 479
 480         return 0;
 481 }
 482
 483
 484 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
 485 {
 486         struct wpabuf *buf;
 487         struct eap_tlv_nak_tlv *nak;
 488         buf = wpabuf_alloc(sizeof(*nak));
 489         if (buf == NULL)
 490                 return NULL;
 491         nak = wpabuf_put(buf, sizeof(*nak));
 492         nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
 493         nak->length = host_to_be16(6);
 494         nak->vendor_id = host_to_be32(vendor_id);
 495         nak->nak_type = host_to_be16(tlv_type);
 496         return buf;
 497 }
 498
 499
 500 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
 501 {
 502         struct wpabuf *buf;
 503         struct eap_tlv_intermediate_result_tlv *result;
 504         buf = wpabuf_alloc(sizeof(*result));
 505         if (buf == NULL)
 506                 return NULL;
 507         wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
 508                    intermediate ? "Intermediate " : "", status);
 509         result = wpabuf_put(buf, sizeof(*result));
 510         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 511                                         (intermediate ?
 512                                          EAP_TLV_INTERMEDIATE_RESULT_TLV :
 513                                          EAP_TLV_RESULT_TLV));
 514         result->length = host_to_be16(2);
 515         result->status = host_to_be16(status);
 516         return buf;
 517 }
 518
 519
 520 static struct wpabuf * eap_fast_tlv_pac_ack(void)
 521 {
 522         struct wpabuf *buf;
 523         struct eap_tlv_result_tlv *res;
 524         struct eap_tlv_pac_ack_tlv *ack;
 525
 526         buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
 527         if (buf == NULL)
 528                 return NULL;
 529
 530         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
 531         ack = wpabuf_put(buf, sizeof(*ack));
 532         ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
 533                                      EAP_TLV_TYPE_MANDATORY);
 534         ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
 535         ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
 536         ack->pac_len = host_to_be16(2);
 537         ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 538
 539         return buf;
 540 }
 541
 542
 543 static struct wpabuf * eap_fast_process_eap_payload_tlv(
 544         struct eap_sm *sm, struct eap_fast_data *data,
 545         struct eap_method_ret *ret, const struct eap_hdr *req,
 546         u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
 547 {
 548         struct eap_hdr *hdr;
 549         struct wpabuf *resp = NULL;
 550
 551         if (eap_payload_tlv_len < sizeof(*hdr)) {
 552                 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
 553                            "Payload TLV (len=%lu)",
 554                            (unsigned long) eap_payload_tlv_len);
 555                 return NULL;
 556         }
 557
 558         hdr = (struct eap_hdr *) eap_payload_tlv;
 559         if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
 560                 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
 561                            "EAP Payload TLV");
 562                 return NULL;
 563         }
 564
 565         if (hdr->code != EAP_CODE_REQUEST) {
 566                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
 567                            "Phase 2 EAP header", hdr->code);
 568                 return NULL;
 569         }
 570
 571         if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
 572                 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
 573                            "failed");
 574                 return NULL;
 575         }
 576
 577         return eap_fast_tlv_eap_payload(resp);
 578 }
 579
 580
 581 static int eap_fast_validate_crypto_binding(
 582         struct eap_tlv_crypto_binding_tlv *_bind)
 583 {
 584         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
 585                    "Received Version %d SubType %d",
 586                    _bind->version, _bind->received_version, _bind->subtype);
 587         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 588                     _bind->nonce, sizeof(_bind->nonce));
 589         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 590                     _bind->compound_mac, sizeof(_bind->compound_mac));
 591
 592         if (_bind->version != EAP_FAST_VERSION ||
 593             _bind->received_version != EAP_FAST_VERSION ||
 594             _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
 595                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
 596                            "Crypto-Binding TLV: Version %d "
 597                            "Received Version %d SubType %d",
 598                            _bind->version, _bind->received_version,
 599                            _bind->subtype);
 600                 return -1;
 601         }
 602
 603         return 0;
 604 }
 605
 606
 607 static void eap_fast_write_crypto_binding(
 608         struct eap_tlv_crypto_binding_tlv *rbind,
 609         struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
 610 {
 611         rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 612                                        EAP_TLV_CRYPTO_BINDING_TLV);
 613         rbind->length = host_to_be16(sizeof(*rbind) -
 614                                      sizeof(struct eap_tlv_hdr));
 615         rbind->version = EAP_FAST_VERSION;
 616         rbind->received_version = _bind->version;
 617         rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
 618         os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
 619         inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
 620         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
 621                   rbind->compound_mac);
 622
 623         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
 624                    "Received Version %d SubType %d",
 625                    rbind->version, rbind->received_version, rbind->subtype);
 626         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 627                     rbind->nonce, sizeof(rbind->nonce));
 628         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 629                     rbind->compound_mac, sizeof(rbind->compound_mac));
 630 }
 631
 632
 633 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 634                                    struct eap_fast_data *data,
 635                                    u8 *isk, size_t isk_len)
 636 {
 637         u8 *key;
 638         size_t key_len;
 639
 640         os_memset(isk, 0, isk_len);
 641
 642         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 643                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 644                            "available");
 645                 return -1;
 646         }
 647
 648         if (data->phase2_method->isKeyAvailable == NULL ||
 649             data->phase2_method->getKey == NULL)
 650                 return 0;
 651
 652         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 653             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 654                                                &key_len)) == NULL) {
 655                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 656                            "from Phase 2");
 657                 return -1;
 658         }
 659
 660         if (key_len > isk_len)
 661                 key_len = isk_len;
 662         if (key_len == 32 &&
 663             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 664             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 665                 /*
 666                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 667                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 668                  * ISK for EAP-FAST cryptobinding.
 669                  */
 670                 os_memcpy(isk, key + 16, 16);
 671                 os_memcpy(isk + 16, key, 16);
 672         } else
 673                 os_memcpy(isk, key, key_len);
 674         os_free(key);
 675
 676         return 0;
 677 }
 678
 679
 680 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
 681                             u8 *cmk)
 682 {
 683         u8 isk[32], imck[60];
 684
 685         wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
 686                    "calculation", data->simck_idx + 1);
 687
 688         /*
 689          * RFC 4851, Section 5.2:
 690          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 691          *                 MSK[j], 60)
 692          * S-IMCK[j] = first 40 octets of IMCK[j]
 693          * CMK[j] = last 20 octets of IMCK[j]
 694          */
 695
 696         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 697                 return -1;
 698         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 699         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 700                    "Inner Methods Compound Keys",
 701                    isk, sizeof(isk), imck, sizeof(imck));
 702         data->simck_idx++;
 703         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 704         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 705                         data->simck, EAP_FAST_SIMCK_LEN);
 706         os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 707         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 708                         cmk, EAP_FAST_CMK_LEN);
 709
 710         return 0;
 711 }
 712
 713
 714 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
 715 {
 716         struct eap_tlv_hdr *pac;
 717         struct eap_tlv_request_action_tlv *act;
 718         struct eap_tlv_pac_type_tlv *type;
 719
 720         act = (struct eap_tlv_request_action_tlv *) pos;
 721         act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
 722         act->length = host_to_be16(2);
 723         act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
 724
 725         pac = (struct eap_tlv_hdr *) (act + 1);
 726         pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
 727         pac->length = host_to_be16(sizeof(*type));
 728
 729         type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
 730         type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
 731         type->length = host_to_be16(2);
 732         type->pac_type = host_to_be16(pac_type);
 733
 734         return (u8 *) (type + 1);
 735 }
 736
 737
 738 static struct wpabuf * eap_fast_process_crypto_binding(
 739         struct eap_sm *sm, struct eap_fast_data *data,
 740         struct eap_method_ret *ret,
 741         struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
 742 {
 743         struct wpabuf *resp;
 744         u8 *pos;
 745         u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
 746         int res;
 747         size_t len;
 748
 749         if (eap_fast_validate_crypto_binding(_bind) < 0)
 750                 return NULL;
 751
 752         if (eap_fast_get_cmk(sm, data, cmk) < 0)
 753                 return NULL;
 754
 755         /* Validate received Compound MAC */
 756         os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
 757         os_memset(_bind->compound_mac, 0, sizeof(cmac));
 758         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
 759                     "MAC calculation", (u8 *) _bind, bind_len);
 760         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
 761                   _bind->compound_mac);
 762         res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
 763         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
 764                     cmac, sizeof(cmac));
 765         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
 766                     _bind->compound_mac, sizeof(cmac));
 767         if (res != 0) {
 768                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
 769                 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
 770                 return NULL;
 771         }
 772
 773         /*
 774          * Compound MAC was valid, so authentication succeeded. Reply with
 775          * crypto binding to allow server to complete authentication.
 776          */
 777
 778         len = sizeof(struct eap_tlv_crypto_binding_tlv);
 779         resp = wpabuf_alloc(len);
 780         if (resp == NULL)
 781                 return NULL;
 782
 783         if (!data->anon_provisioning && data->phase2_success &&
 784             eap_fast_derive_msk(data) < 0) {
 785                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
 786                 ret->methodState = METHOD_DONE;
 787                 ret->decision = DECISION_FAIL;
 788                 data->phase2_success = 0;
 789                 wpabuf_free(resp);
 790                 return NULL;
 791         }
 792
 793         pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
 794         eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
 795                                       pos, _bind, cmk);
 796
 797         return resp;
 798 }
 799
 800
 801 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
 802                                    u8 *pos, size_t len, int *pac_key_found)
 803 {
 804         switch (type & 0x7fff) {
 805         case PAC_TYPE_PAC_KEY:
 806                 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
 807                 if (len != EAP_FAST_PAC_KEY_LEN) {
 808                         wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
 809                                    "length %lu", (unsigned long) len);
 810                         break;
 811                 }
 812                 *pac_key_found = 1;
 813                 os_memcpy(entry->pac_key, pos, len);
 814                 break;
 815         case PAC_TYPE_PAC_OPAQUE:
 816                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
 817                 entry->pac_opaque = pos;
 818                 entry->pac_opaque_len = len;
 819                 break;
 820         case PAC_TYPE_PAC_INFO:
 821                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
 822                 entry->pac_info = pos;
 823                 entry->pac_info_len = len;
 824                 break;
 825         default:
 826                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
 827                            type);
 828                 break;
 829         }
 830 }
 831
 832
 833 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
 834                                     u8 *pac, size_t pac_len)
 835 {
 836         struct pac_tlv_hdr *hdr;
 837         u8 *pos;
 838         size_t left, len;
 839         int type, pac_key_found = 0;
 840
 841         pos = pac;
 842         left = pac_len;
 843
 844         while (left > sizeof(*hdr)) {
 845                 hdr = (struct pac_tlv_hdr *) pos;
 846                 type = be_to_host16(hdr->type);
 847                 len = be_to_host16(hdr->len);
 848                 pos += sizeof(*hdr);
 849                 left -= sizeof(*hdr);
 850                 if (len > left) {
 851                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
 852                                    "(type=%d len=%lu left=%lu)",
 853                                    type, (unsigned long) len,
 854                                    (unsigned long) left);
 855                         return -1;
 856                 }
 857
 858                 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
 859
 860                 pos += len;
 861                 left -= len;
 862         }
 863
 864         if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
 865                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
 866                            "all the required fields");
 867                 return -1;
 868         }
 869
 870         return 0;
 871 }
 872
 873
 874 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
 875                                    u8 *pos, size_t len)
 876 {
 877         u16 pac_type;
 878         u32 lifetime;
 879         struct os_time now;
 880
 881         switch (type & 0x7fff) {
 882         case PAC_TYPE_CRED_LIFETIME:
 883                 if (len != 4) {
 884                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
 885                                     "Invalid CRED_LIFETIME length - ignored",
 886                                     pos, len);
 887                         return 0;
 888                 }
 889
 890                 /*
 891                  * This is not currently saved separately in PAC files since
 892                  * the server can automatically initiate PAC update when
 893                  * needed. Anyway, the information is available from PAC-Info
 894                  * dump if it is needed for something in the future.
 895                  */
 896                 lifetime = WPA_GET_BE32(pos);
 897                 os_get_time(&now);
 898                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
 899                            "(%d days)",
 900                            lifetime, (lifetime - (u32) now.sec) / 86400);
 901                 break;
 902         case PAC_TYPE_A_ID:
 903                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
 904                                   pos, len);
 905                 entry->a_id = pos;
 906                 entry->a_id_len = len;
 907                 break;
 908         case PAC_TYPE_I_ID:
 909                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
 910                                   pos, len);
 911                 entry->i_id = pos;
 912                 entry->i_id_len = len;
 913                 break;
 914         case PAC_TYPE_A_ID_INFO:
 915                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
 916                                   pos, len);
 917                 entry->a_id_info = pos;
 918                 entry->a_id_info_len = len;
 919                 break;
 920         case PAC_TYPE_PAC_TYPE:
 921                 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
 922                 if (len != 2) {
 923                         wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
 924                                    "length %lu (expected 2)",
 925                                    (unsigned long) len);
 926                         wpa_hexdump_ascii(MSG_DEBUG,
 927                                           "EAP-FAST: PAC-Info - PAC-Type",
 928                                           pos, len);
 929                         return -1;
 930                 }
 931                 pac_type = WPA_GET_BE16(pos);
 932                 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
 933                     pac_type != PAC_TYPE_USER_AUTHORIZATION &&
 934                     pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
 935                         wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
 936                                    "%d", pac_type);
 937                         return -1;
 938                 }
 939
 940                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
 941                            pac_type);
 942                 entry->pac_type = pac_type;
 943                 break;
 944         default:
 945                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
 946                            "type %d", type);
 947                 break;
 948         }
 949
 950         return 0;
 951 }
 952
 953
 954 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
 955 {
 956         struct pac_tlv_hdr *hdr;
 957         u8 *pos;
 958         size_t left, len;
 959         int type;
 960
 961         /* RFC 5422, Section 4.2.4 */
 962
 963         /* PAC-Type defaults to Tunnel PAC (Type 1) */
 964         entry->pac_type = PAC_TYPE_TUNNEL_PAC;
 965
 966         pos = entry->pac_info;
 967         left = entry->pac_info_len;
 968         while (left > sizeof(*hdr)) {
 969                 hdr = (struct pac_tlv_hdr *) pos;
 970                 type = be_to_host16(hdr->type);
 971                 len = be_to_host16(hdr->len);
 972                 pos += sizeof(*hdr);
 973                 left -= sizeof(*hdr);
 974                 if (len > left) {
 975                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
 976                                    "(type=%d len=%lu left=%lu)",
 977                                    type, (unsigned long) len,
 978                                    (unsigned long) left);
 979                         return -1;
 980                 }
 981
 982                 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
 983                         return -1;
 984
 985                 pos += len;
 986                 left -= len;
 987         }
 988
 989         if (entry->a_id == NULL || entry->a_id_info == NULL) {
 990                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
 991                            "all the required fields");
 992                 return -1;
 993         }
 994
 995         return 0;
 996 }
 997
 998
 999 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1000                                             struct eap_fast_data *data,
1001                                             struct eap_method_ret *ret,
1002                                             u8 *pac, size_t pac_len)
1003 {
1004         struct eap_peer_config *config = eap_get_config(sm);
1005         struct eap_fast_pac entry;
1006
1007         os_memset(&entry, 0, sizeof(entry));
1008         if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1009             eap_fast_process_pac_info(&entry))
1010                 return NULL;
1011
1012         eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1013         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1014         if (data->use_pac_binary_format)
1015                 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1016         else
1017                 eap_fast_save_pac(sm, data->pac, config->pac_file);
1018
1019         if (data->provisioning) {
1020                 if (data->anon_provisioning) {
1021                         /*
1022                          * Unauthenticated provisioning does not provide keying
1023                          * material and must end with an EAP-Failure.
1024                          * Authentication will be done separately after this.
1025                          */
1026                         data->success = 0;
1027                         ret->decision = DECISION_FAIL;
1028                 } else {
1029                         /*
1030                          * Server may or may not allow authenticated
1031                          * provisioning also for key generation.
1032                          */
1033                         ret->decision = DECISION_COND_SUCC;
1034                 }
1035                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1036                            "- Provisioning completed successfully");
1037         } else {
1038                 /*
1039                  * This is PAC refreshing, i.e., normal authentication that is
1040                  * expected to be completed with an EAP-Success.
1041                  */
1042                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1043                            "- PAC refreshing completed successfully");
1044                 ret->decision = DECISION_UNCOND_SUCC;
1045         }
1046         ret->methodState = METHOD_DONE;
1047         return eap_fast_tlv_pac_ack();
1048 }
1049
1050
1051 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1052                                     struct eap_fast_tlv_parse *tlv,
1053                                     struct wpabuf **resp)
1054 {
1055         int mandatory, tlv_type, len, res;
1056         u8 *pos, *end;
1057
1058         os_memset(tlv, 0, sizeof(*tlv));
1059
1060         /* Parse TLVs from the decrypted Phase 2 data */
1061         pos = wpabuf_mhead(decrypted);
1062         end = pos + wpabuf_len(decrypted);
1063         while (pos + 4 < end) {
1064                 mandatory = pos[0] & 0x80;
1065                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1066                 pos += 2;
1067                 len = WPA_GET_BE16(pos);
1068                 pos += 2;
1069                 if (pos + len > end) {
1070                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1071                         return -1;
1072                 }
1073                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1074                            "TLV type %d length %d%s",
1075                            tlv_type, len, mandatory ? " (mandatory)" : "");
1076
1077                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1078                 if (res == -2)
1079                         break;
1080                 if (res < 0) {
1081                         if (mandatory) {
1082                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1083                                            "mandatory TLV type %d", tlv_type);
1084                                 *resp = eap_fast_tlv_nak(0, tlv_type);
1085                                 break;
1086                         } else {
1087                                 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1088                                            "unknown optional TLV type %d",
1089                                            tlv_type);
1090                         }
1091                 }
1092
1093                 pos += len;
1094         }
1095
1096         return 0;
1097 }
1098
1099
1100 static int eap_fast_encrypt_response(struct eap_sm *sm,
1101                                      struct eap_fast_data *data,
1102                                      struct wpabuf *resp,
1103                                      u8 identifier, struct wpabuf **out_data)
1104 {
1105         if (resp == NULL)
1106                 return 0;
1107
1108         wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1109                         resp);
1110         if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1111                                  data->fast_version, identifier,
1112                                  resp, out_data)) {
1113                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1114                            "frame");
1115         }
1116         wpabuf_free(resp);
1117
1118         return 0;
1119 }
1120
1121
1122 static struct wpabuf * eap_fast_pac_request(void)
1123 {
1124         struct wpabuf *tmp;
1125         u8 *pos, *pos2;
1126
1127         tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1128                            sizeof(struct eap_tlv_request_action_tlv) +
1129                            sizeof(struct eap_tlv_pac_type_tlv));
1130         if (tmp == NULL)
1131                 return NULL;
1132
1133         pos = wpabuf_put(tmp, 0);
1134         pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1135         wpabuf_put(tmp, pos2 - pos);
1136         return tmp;
1137 }
1138
1139
1140 static int eap_fast_process_decrypted(struct eap_sm *sm,
1141                                       struct eap_fast_data *data,
1142                                       struct eap_method_ret *ret,
1143                                       const struct eap_hdr *req,
1144                                       struct wpabuf *decrypted,
1145                                       struct wpabuf **out_data)
1146 {
1147         struct wpabuf *resp = NULL, *tmp;
1148         struct eap_fast_tlv_parse tlv;
1149         int failed = 0;
1150
1151         if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1152                 return 0;
1153         if (resp)
1154                 return eap_fast_encrypt_response(sm, data, resp,
1155                                                  req->identifier, out_data);
1156
1157         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1158                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1159                 return eap_fast_encrypt_response(sm, data, resp,
1160                                                  req->identifier, out_data);
1161         }
1162
1163         if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1164                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1165                 return eap_fast_encrypt_response(sm, data, resp,
1166                                                  req->identifier, out_data);
1167         }
1168
1169         if (tlv.crypto_binding) {
1170                 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1171                                                       tlv.crypto_binding,
1172                                                       tlv.crypto_binding_len);
1173                 if (tmp == NULL)
1174                         failed = 1;
1175                 else
1176                         resp = wpabuf_concat(resp, tmp);
1177         }
1178
1179         if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1180                 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1181                                           EAP_TLV_RESULT_SUCCESS, 1);
1182                 resp = wpabuf_concat(resp, tmp);
1183         }
1184
1185         if (tlv.eap_payload_tlv) {
1186                 tmp = eap_fast_process_eap_payload_tlv(
1187                         sm, data, ret, req, tlv.eap_payload_tlv,
1188                         tlv.eap_payload_tlv_len);
1189                 resp = wpabuf_concat(resp, tmp);
1190         }
1191
1192         if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1193                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1194                            "acknowledging success");
1195                 failed = 1;
1196         } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1197                 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1198                                            tlv.pac_len);
1199                 resp = wpabuf_concat(resp, tmp);
1200         }
1201
1202         if (data->current_pac == NULL && data->provisioning &&
1203             !data->anon_provisioning && !tlv.pac &&
1204             (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1205              tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1206                 /*
1207                  * Need to request Tunnel PAC when using authenticated
1208                  * provisioning.
1209                  */
1210                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1211                 tmp = eap_fast_pac_request();
1212                 resp = wpabuf_concat(resp, tmp);
1213         }
1214
1215         if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1216                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1217                 resp = wpabuf_concat(tmp, resp);
1218         } else if (failed) {
1219                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1220                 resp = wpabuf_concat(tmp, resp);
1221         }
1222
1223         if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1224             tlv.crypto_binding && data->phase2_success) {
1225                 if (data->anon_provisioning) {
1226                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1227                                    "provisioning completed successfully.");
1228                         ret->methodState = METHOD_DONE;
1229                         ret->decision = DECISION_FAIL;
1230                 } else {
1231                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1232                                    "completed successfully.");
1233                         if (data->provisioning)
1234                                 ret->methodState = METHOD_MAY_CONT;
1235                         else
1236                                 ret->methodState = METHOD_DONE;
1237                         ret->decision = DECISION_UNCOND_SUCC;
1238                 }
1239         }
1240
1241         if (resp == NULL) {
1242                 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1243                            "empty response packet");
1244                 resp = wpabuf_alloc(1);
1245         }
1246
1247         return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1248                                          out_data);
1249 }
1250
1251
1252 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1253                             struct eap_method_ret *ret,
1254                             const struct eap_hdr *req,
1255                             const struct wpabuf *in_data,
1256                             struct wpabuf **out_data)
1257 {
1258         struct wpabuf *in_decrypted;
1259         int res;
1260
1261         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1262                    " Phase 2", (unsigned long) wpabuf_len(in_data));
1263
1264         if (data->pending_phase2_req) {
1265                 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1266                            "skip decryption and use old data");
1267                 /* Clear TLS reassembly state. */
1268                 eap_peer_tls_reset_input(&data->ssl);
1269
1270                 in_decrypted = data->pending_phase2_req;
1271                 data->pending_phase2_req = NULL;
1272                 goto continue_req;
1273         }
1274
1275         if (wpabuf_len(in_data) == 0) {
1276                 /* Received TLS ACK - requesting more fragments */
1277                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1278                                             data->fast_version,
1279                                             req->identifier, NULL, out_data);
1280         }
1281
1282         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1283         if (res)
1284                 return res;
1285
1286 continue_req:
1287         wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1288                         in_decrypted);
1289
1290         if (wpabuf_len(in_decrypted) < 4) {
1291                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1292                            "TLV frame (len=%lu)",
1293                            (unsigned long) wpabuf_len(in_decrypted));
1294                 wpabuf_free(in_decrypted);
1295                 return -1;
1296         }
1297
1298         res = eap_fast_process_decrypted(sm, data, ret, req,
1299                                          in_decrypted, out_data);
1300
1301         wpabuf_free(in_decrypted);
1302
1303         return res;
1304 }
1305
1306
1307 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1308 {
1309         const u8 *a_id;
1310         struct pac_tlv_hdr *hdr;
1311
1312         /*
1313          * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1314          * supports both raw A-ID and one inside an A-ID TLV.
1315          */
1316         a_id = buf;
1317         *id_len = len;
1318         if (len > sizeof(*hdr)) {
1319                 int tlen;
1320                 hdr = (struct pac_tlv_hdr *) buf;
1321                 tlen = be_to_host16(hdr->len);
1322                 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1323                     sizeof(*hdr) + tlen <= len) {
1324                         wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1325                                    "(Start)");
1326                         a_id = (u8 *) (hdr + 1);
1327                         *id_len = tlen;
1328                 }
1329         }
1330         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1331
1332         return a_id;
1333 }
1334
1335
1336 static void eap_fast_select_pac(struct eap_fast_data *data,
1337                                 const u8 *a_id, size_t a_id_len)
1338 {
1339         data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1340                                              PAC_TYPE_TUNNEL_PAC);
1341         if (data->current_pac == NULL) {
1342                 /*
1343                  * Tunnel PAC was not available for this A-ID. Try to use
1344                  * Machine Authentication PAC, if one is available.
1345                  */
1346                 data->current_pac = eap_fast_get_pac(
1347                         data->pac, a_id, a_id_len,
1348                         PAC_TYPE_MACHINE_AUTHENTICATION);
1349         }
1350
1351         if (data->current_pac) {
1352                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1353                            "(PAC-Type %d)", data->current_pac->pac_type);
1354                 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1355                                   data->current_pac->a_id_info,
1356                                   data->current_pac->a_id_info_len);
1357         }
1358 }
1359
1360
1361 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1362                                    struct eap_fast_data *data,
1363                                    struct eap_fast_pac *pac)
1364 {
1365         u8 *tlv;
1366         size_t tlv_len, olen;
1367         struct eap_tlv_hdr *ehdr;
1368
1369         olen = pac->pac_opaque_len;
1370         tlv_len = sizeof(*ehdr) + olen;
1371         tlv = os_malloc(tlv_len);
1372         if (tlv) {
1373                 ehdr = (struct eap_tlv_hdr *) tlv;
1374                 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1375                 ehdr->length = host_to_be16(olen);
1376                 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1377         }
1378         if (tlv == NULL ||
1379             tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1380                                             TLS_EXT_PAC_OPAQUE,
1381                                             tlv, tlv_len) < 0) {
1382                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1383                            "extension");
1384                 os_free(tlv);
1385                 return -1;
1386         }
1387         os_free(tlv);
1388
1389         return 0;
1390 }
1391
1392
1393 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1394                                          struct eap_fast_data *data)
1395 {
1396         if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1397                                             TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1398                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1399                            "TLS extension");
1400                 return -1;
1401         }
1402         return 0;
1403 }
1404
1405
1406 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1407                                              struct eap_fast_data *data)
1408 {
1409         u8 ciphers[5];
1410         int count = 0;
1411
1412         if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1413                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1414                            "provisioning TLS cipher suites");
1415                 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1416         }
1417
1418         if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1419                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1420                            "provisioning TLS cipher suites");
1421                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1422                 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1423                 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1424         }
1425
1426         ciphers[count++] = TLS_CIPHER_NONE;
1427
1428         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1429                                            ciphers)) {
1430                 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1431                            "cipher suites for provisioning");
1432                 return -1;
1433         }
1434
1435         return 0;
1436 }
1437
1438
1439 static int eap_fast_process_start(struct eap_sm *sm,
1440                                   struct eap_fast_data *data, u8 flags,
1441                                   const u8 *pos, size_t left)
1442 {
1443         const u8 *a_id;
1444         size_t a_id_len;
1445
1446         /* EAP-FAST Version negotiation (section 3.1) */
1447         wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1448                    flags & EAP_PEAP_VERSION_MASK, data->fast_version);
1449         if ((flags & EAP_PEAP_VERSION_MASK) < data->fast_version)
1450                 data->fast_version = flags & EAP_PEAP_VERSION_MASK;
1451         wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1452                    data->fast_version);
1453
1454         a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1455         eap_fast_select_pac(data, a_id, a_id_len);
1456
1457         if (data->resuming && data->current_pac) {
1458                 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1459                            "do not add PAC-Opaque to TLS ClientHello");
1460                 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1461                         return -1;
1462         } else if (data->current_pac) {
1463                 /*
1464                  * PAC found for the A-ID and we are not resuming an old
1465                  * session, so add PAC-Opaque extension to ClientHello.
1466                  */
1467                 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1468                         return -1;
1469         } else {
1470                 /* No PAC found, so we must provision one. */
1471                 if (!data->provisioning_allowed) {
1472                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1473                                    "provisioning disabled");
1474                         return -1;
1475                 }
1476                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1477                            "starting provisioning");
1478                 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1479                     eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1480                         return -1;
1481                 data->provisioning = 1;
1482         }
1483
1484         return 0;
1485 }
1486
1487
1488 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1489                                         struct eap_method_ret *ret,
1490                                         const struct wpabuf *reqData)
1491 {
1492         const struct eap_hdr *req;
1493         size_t left;
1494         int res;
1495         u8 flags, id;
1496         struct wpabuf *resp;
1497         const u8 *pos;
1498         struct eap_fast_data *data = priv;
1499
1500         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1501                                         reqData, &left, &flags);
1502         if (pos == NULL)
1503                 return NULL;
1504
1505         req = wpabuf_head(reqData);
1506         id = req->identifier;
1507
1508         if (flags & EAP_TLS_FLAGS_START) {
1509                 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1510                         return NULL;
1511
1512                 left = 0; /* A-ID is not used in further packet processing */
1513         }
1514
1515         resp = NULL;
1516         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1517             !data->resuming) {
1518                 /* Process tunneled (encrypted) phase 2 data. */
1519                 struct wpabuf msg;
1520                 wpabuf_set(&msg, pos, left);
1521                 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1522                 if (res < 0) {
1523                         ret->methodState = METHOD_DONE;
1524                         ret->decision = DECISION_FAIL;
1525                         /*
1526                          * Ack possible Alert that may have caused failure in
1527                          * decryption.
1528                          */
1529                         res = 1;
1530                 }
1531         } else {
1532                 /* Continue processing TLS handshake (phase 1). */
1533                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1534                                                   EAP_TYPE_FAST,
1535                                                   data->fast_version, id, pos,
1536                                                   left, &resp);
1537
1538                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1539                         char cipher[80];
1540                         wpa_printf(MSG_DEBUG,
1541                                    "EAP-FAST: TLS done, proceed to Phase 2");
1542                         if (data->provisioning &&
1543                             (!(data->provisioning_allowed &
1544                                EAP_FAST_PROV_AUTH) ||
1545                              tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1546                                             cipher, sizeof(cipher)) < 0 ||
1547                              os_strstr(cipher, "ADH-") ||
1548                              os_strstr(cipher, "anon"))) {
1549                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1550                                            "anonymous (unauthenticated) "
1551                                            "provisioning");
1552                                 data->anon_provisioning = 1;
1553                         } else
1554                                 data->anon_provisioning = 0;
1555                         data->resuming = 0;
1556                         eap_fast_derive_keys(sm, data);
1557                 }
1558
1559                 if (res == 2) {
1560                         struct wpabuf msg;
1561                         /*
1562                          * Application data included in the handshake message.
1563                          */
1564                         wpabuf_free(data->pending_phase2_req);
1565                         data->pending_phase2_req = resp;
1566                         resp = NULL;
1567                         wpabuf_set(&msg, pos, left);
1568                         res = eap_fast_decrypt(sm, data, ret, req, &msg,
1569                                                &resp);
1570                 }
1571         }
1572
1573         if (res == 1) {
1574                 wpabuf_free(resp);
1575                 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1576                                               data->fast_version);
1577         }
1578
1579         return resp;
1580 }
1581
1582
1583 #if 0 /* FIX */
1584 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1585 {
1586         struct eap_fast_data *data = priv;
1587         return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1588 }
1589
1590
1591 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1592 {
1593         struct eap_fast_data *data = priv;
1594         os_free(data->key_block_p);
1595         data->key_block_p = NULL;
1596         wpabuf_free(data->pending_phase2_req);
1597         data->pending_phase2_req = NULL;
1598 }
1599
1600
1601 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1602 {
1603         struct eap_fast_data *data = priv;
1604         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1605                 os_free(data);
1606                 return NULL;
1607         }
1608         if (data->phase2_priv && data->phase2_method &&
1609             data->phase2_method->init_for_reauth)
1610                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1611         data->phase2_success = 0;
1612         data->resuming = 1;
1613         data->provisioning = 0;
1614         data->anon_provisioning = 0;
1615         data->simck_idx = 0;
1616         return priv;
1617 }
1618 #endif
1619
1620
1621 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1622                                size_t buflen, int verbose)
1623 {
1624         struct eap_fast_data *data = priv;
1625         int len, ret;
1626
1627         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1628         if (data->phase2_method) {
1629                 ret = os_snprintf(buf + len, buflen - len,
1630                                   "EAP-FAST Phase2 method=%s\n",
1631                                   data->phase2_method->name);
1632                 if (ret < 0 || (size_t) ret >= buflen - len)
1633                         return len;
1634                 len += ret;
1635         }
1636         return len;
1637 }
1638
1639
1640 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1641 {
1642         struct eap_fast_data *data = priv;
1643         return data->success;
1644 }
1645
1646
1647 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1648 {
1649         struct eap_fast_data *data = priv;
1650         u8 *key;
1651
1652         if (!data->success)
1653                 return NULL;
1654
1655         key = os_malloc(EAP_FAST_KEY_LEN);
1656         if (key == NULL)
1657                 return NULL;
1658
1659         *len = EAP_FAST_KEY_LEN;
1660         os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1661
1662         return key;
1663 }
1664
1665
1666 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1667 {
1668         struct eap_fast_data *data = priv;
1669         u8 *key;
1670
1671         if (!data->success)
1672                 return NULL;
1673
1674         key = os_malloc(EAP_EMSK_LEN);
1675         if (key == NULL)
1676                 return NULL;
1677
1678         *len = EAP_EMSK_LEN;
1679         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1680
1681         return key;
1682 }
1683
1684
1685 int eap_peer_fast_register(void)
1686 {
1687         struct eap_method *eap;
1688         int ret;
1689
1690         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1691                                     EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1692         if (eap == NULL)
1693                 return -1;
1694
1695         eap->init = eap_fast_init;
1696         eap->deinit = eap_fast_deinit;
1697         eap->process = eap_fast_process;
1698         eap->isKeyAvailable = eap_fast_isKeyAvailable;
1699         eap->getKey = eap_fast_getKey;
1700         eap->get_status = eap_fast_get_status;
1701 #if 0
1702         eap->has_reauth_data = eap_fast_has_reauth_data;
1703         eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1704         eap->init_for_reauth = eap_fast_init_for_reauth;
1705 #endif
1706         eap->get_emsk = eap_fast_get_emsk;
1707
1708         ret = eap_peer_method_register(eap);
1709         if (ret)
1710                 eap_peer_method_free(eap);
1711         return ret;
1712 }