src/eap_server/eap_fast.c

   1 /*
   2  * EAP-FAST server (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 "aes_wrap.h"
  19 #include "sha1.h"
  20 #include "eap_i.h"
  21 #include "eap_tls_common.h"
  22 #include "tls.h"
  23 #include "eap_common/eap_tlv_common.h"
  24 #include "eap_common/eap_fast_common.h"
  25
  26
  27 static void eap_fast_reset(struct eap_sm *sm, void *priv);
  28
  29
  30 /* Private PAC-Opaque TLV types */
  31 #define PAC_OPAQUE_TYPE_PAD 0
  32 #define PAC_OPAQUE_TYPE_KEY 1
  33 #define PAC_OPAQUE_TYPE_LIFETIME 2
  34
  35 /* PAC-Key lifetime in seconds (hard limit) */
  36 #define PAC_KEY_LIFETIME (7 * 24 * 60 * 60)
  37
  38 /*
  39  * PAC-Key refresh time in seconds (soft limit on remaining hard limit). The
  40  * server will generate a new PAC-Key when this number of seconds (or fewer)
  41  * of the lifetime.
  42  */
  43 #define PAC_KEY_REFRESH_TIME (1 * 24 * 60 * 60)
  44
  45
  46 struct eap_fast_data {
  47         struct eap_ssl_data ssl;
  48         enum {
  49                 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
  50                 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
  51         } state;
  52
  53         int fast_version;
  54         const struct eap_method *phase2_method;
  55         void *phase2_priv;
  56         int force_version;
  57         int peer_version;
  58
  59         u8 crypto_binding_nonce[32];
  60         int final_result;
  61
  62         struct eap_fast_key_block_provisioning *key_block_p;
  63
  64         u8 simck[EAP_FAST_SIMCK_LEN];
  65         u8 cmk[20];
  66         int simck_idx;
  67
  68         u8 pac_opaque_encr[16];
  69         char *srv_id;
  70
  71         int anon_provisioning;
  72         int send_new_pac; /* server triggered re-keying of Tunnel PAC */
  73         struct wpabuf *pending_phase2_resp;
  74 };
  75
  76
  77 static const char * eap_fast_state_txt(int state)
  78 {
  79         switch (state) {
  80         case START:
  81                 return "START";
  82         case PHASE1:
  83                 return "PHASE1";
  84         case PHASE2_START:
  85                 return "PHASE2_START";
  86         case PHASE2_ID:
  87                 return "PHASE2_ID";
  88         case PHASE2_METHOD:
  89                 return "PHASE2_METHOD";
  90         case CRYPTO_BINDING:
  91                 return "CRYPTO_BINDING";
  92         case REQUEST_PAC:
  93                 return "REQUEST_PAC";
  94         case SUCCESS:
  95                 return "SUCCESS";
  96         case FAILURE:
  97                 return "FAILURE";
  98         default:
  99                 return "Unknown?!";
 100         }
 101 }
 102
 103
 104 static void eap_fast_state(struct eap_fast_data *data, int state)
 105 {
 106         wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
 107                    eap_fast_state_txt(data->state),
 108                    eap_fast_state_txt(state));
 109         data->state = state;
 110 }
 111
 112
 113 static EapType eap_fast_req_failure(struct eap_sm *sm,
 114                                     struct eap_fast_data *data)
 115 {
 116         /* TODO: send Result TLV(FAILURE) */
 117         eap_fast_state(data, FAILURE);
 118         return EAP_TYPE_NONE;
 119 }
 120
 121
 122 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 123                                       const u8 *client_random,
 124                                       const u8 *server_random,
 125                                       u8 *master_secret)
 126 {
 127         struct eap_fast_data *data = ctx;
 128 #define TLS_RANDOM_LEN 32
 129 #define TLS_MASTER_SECRET_LEN 48
 130         u8 seed[2 * TLS_RANDOM_LEN];
 131         const u8 *pac_opaque;
 132         size_t pac_opaque_len;
 133         u8 *buf, *pos, *end, *pac_key = NULL;
 134         os_time_t lifetime = 0;
 135         struct os_time now;
 136
 137         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
 138         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
 139                     ticket, len);
 140         wpa_hexdump(MSG_DEBUG, "EAP-FAST: client_random",
 141                     client_random, TLS_RANDOM_LEN);
 142         wpa_hexdump(MSG_DEBUG, "EAP-FAST: server_random",
 143                     server_random, TLS_RANDOM_LEN);
 144
 145         if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
 146                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
 147                            "SessionTicket");
 148                 return 0;
 149         }
 150
 151         pac_opaque_len = WPA_GET_BE16(ticket + 2);
 152         pac_opaque = ticket + 4;
 153         if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
 154             pac_opaque_len > len - 4) {
 155                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
 156                            "(len=%lu left=%lu)",
 157                            (unsigned long) pac_opaque_len,
 158                            (unsigned long) len);
 159                 return 0;
 160         }
 161         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
 162                     pac_opaque, pac_opaque_len);
 163
 164         buf = os_malloc(pac_opaque_len - 8);
 165         if (buf == NULL) {
 166                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 167                            "for decrypting PAC-Opaque");
 168                 return 0;
 169         }
 170
 171         if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
 172                        pac_opaque, buf) < 0) {
 173                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
 174                            "PAC-Opaque");
 175                 os_free(buf);
 176                 /*
 177                  * This may have been caused by server changing the PAC-Opaque
 178                  * encryption key, so just ignore this PAC-Opaque instead of
 179                  * failing the authentication completely. Provisioning can now
 180                  * be used to provision a new PAC.
 181                  */
 182                 return 0;
 183         }
 184
 185         end = buf + pac_opaque_len - 8;
 186         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
 187                         buf, end - buf);
 188
 189         pos = buf;
 190         while (pos + 1 < end) {
 191                 if (pos + 2 + pos[1] > end)
 192                         break;
 193
 194                 switch (*pos) {
 195                 case PAC_OPAQUE_TYPE_PAD:
 196                         pos = end;
 197                         break;
 198                 case PAC_OPAQUE_TYPE_KEY:
 199                         if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
 200                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 201                                            "PAC-Key length %d", pos[1]);
 202                                 os_free(buf);
 203                                 return -1;
 204                         }
 205                         pac_key = pos + 2;
 206                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 207                                         "decrypted PAC-Opaque",
 208                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 209                         break;
 210                 case PAC_OPAQUE_TYPE_LIFETIME:
 211                         if (pos[1] != 4) {
 212                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 213                                            "PAC-Key lifetime length %d",
 214                                            pos[1]);
 215                                 os_free(buf);
 216                                 return -1;
 217                         }
 218                         lifetime = WPA_GET_BE32(pos + 2);
 219                         break;
 220                 }
 221
 222                 pos += 2 + pos[1];
 223         }
 224
 225         if (pac_key == NULL) {
 226                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
 227                            "PAC-Opaque");
 228                 os_free(buf);
 229                 return -1;
 230         }
 231
 232         if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
 233                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
 234                            "(lifetime=%ld now=%ld)", lifetime, now.sec);
 235                 os_free(buf);
 236                 return 0;
 237         }
 238
 239         if (lifetime - now.sec < PAC_KEY_REFRESH_TIME)
 240                 data->send_new_pac = 1;
 241
 242         /*
 243          * RFC 4851, Section 5.1:
 244          * master_secret = T-PRF(PAC-Key, "PAC to master secret label hash",
 245          *                       server_random + client_random, 48)
 246          */
 247         os_memcpy(seed, server_random, TLS_RANDOM_LEN);
 248         os_memcpy(seed + TLS_RANDOM_LEN, client_random, TLS_RANDOM_LEN);
 249         sha1_t_prf(pac_key, EAP_FAST_PAC_KEY_LEN,
 250                    "PAC to master secret label hash",
 251                    seed, sizeof(seed), master_secret, TLS_MASTER_SECRET_LEN);
 252
 253         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: master_secret",
 254                         master_secret, TLS_MASTER_SECRET_LEN);
 255
 256         os_free(buf);
 257
 258         return 1;
 259 }
 260
 261
 262 static u8 * eap_fast_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
 263                                 char *label, size_t len)
 264 {
 265         struct tls_keys keys;
 266         u8 *rnd = NULL, *out;
 267         int block_size;
 268
 269         block_size = tls_connection_get_keyblock_size(sm->ssl_ctx, data->conn);
 270         if (block_size < 0)
 271                 return NULL;
 272
 273         out = os_malloc(block_size + len);
 274         if (out == NULL)
 275                 return NULL;
 276
 277         if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 1, out,
 278                                block_size + len) == 0) {
 279                 os_memmove(out, out + block_size, len);
 280                 return out;
 281         }
 282
 283         if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
 284                 goto fail;
 285
 286         rnd = os_malloc(keys.client_random_len + keys.server_random_len);
 287         if (rnd == NULL)
 288                 goto fail;
 289
 290         os_memcpy(rnd, keys.server_random, keys.server_random_len);
 291         os_memcpy(rnd + keys.server_random_len, keys.client_random,
 292                   keys.client_random_len);
 293
 294         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: master_secret for key "
 295                         "expansion", keys.master_key, keys.master_key_len);
 296         if (tls_prf(keys.master_key, keys.master_key_len,
 297                     label, rnd, keys.client_random_len +
 298                     keys.server_random_len, out, block_size + len))
 299                 goto fail;
 300         os_free(rnd);
 301         os_memmove(out, out + block_size, len);
 302         return out;
 303
 304 fail:
 305         os_free(rnd);
 306         os_free(out);
 307         return NULL;
 308 }
 309
 310
 311 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 312                                      struct eap_fast_data *data)
 313 {
 314         u8 *sks;
 315
 316         /* RFC 4851, Section 5.1:
 317          * Extra key material after TLS key_block: session_key_seed[40]
 318          */
 319
 320         sks = eap_fast_derive_key(sm, &data->ssl, "key expansion",
 321                                   EAP_FAST_SKS_LEN);
 322         if (sks == NULL) {
 323                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 324                            "session_key_seed");
 325                 return;
 326         }
 327
 328         /*
 329          * RFC 4851, Section 5.2:
 330          * S-IMCK[0] = session_key_seed
 331          */
 332         wpa_hexdump_key(MSG_DEBUG,
 333                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 334                         sks, EAP_FAST_SKS_LEN);
 335         data->simck_idx = 0;
 336         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 337         os_free(sks);
 338 }
 339
 340
 341 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 342                                              struct eap_fast_data *data)
 343 {
 344         os_free(data->key_block_p);
 345         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 346                 eap_fast_derive_key(sm, &data->ssl, "key expansion",
 347                                     sizeof(*data->key_block_p));
 348         if (data->key_block_p == NULL) {
 349                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 350                 return;
 351         }
 352         /*
 353          * RFC 4851, Section 5.2:
 354          * S-IMCK[0] = session_key_seed
 355          */
 356         wpa_hexdump_key(MSG_DEBUG,
 357                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 358                         data->key_block_p->session_key_seed,
 359                         sizeof(data->key_block_p->session_key_seed));
 360         data->simck_idx = 0;
 361         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 362                   EAP_FAST_SIMCK_LEN);
 363         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 364                         data->key_block_p->server_challenge,
 365                         sizeof(data->key_block_p->server_challenge));
 366         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 367                         data->key_block_p->client_challenge,
 368                         sizeof(data->key_block_p->client_challenge));
 369 }
 370
 371
 372 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 373                                    struct eap_fast_data *data,
 374                                    u8 *isk, size_t isk_len)
 375 {
 376         u8 *key;
 377         size_t key_len;
 378
 379         os_memset(isk, 0, isk_len);
 380
 381         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 382                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 383                            "available");
 384                 return -1;
 385         }
 386
 387         if (data->phase2_method->getKey == NULL)
 388                 return 0;
 389
 390         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 391                                                &key_len)) == NULL) {
 392                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 393                            "from Phase 2");
 394                 return -1;
 395         }
 396
 397         if (key_len > isk_len)
 398                 key_len = isk_len;
 399         os_memcpy(isk, key, key_len);
 400         os_free(key);
 401
 402         return 0;
 403 }
 404
 405
 406 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 407 {
 408         u8 isk[32], imck[60];
 409
 410         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 411                    data->simck_idx + 1);
 412
 413         /*
 414          * RFC 4851, Section 5.2:
 415          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 416          *                 MSK[j], 60)
 417          * S-IMCK[j] = first 40 octets of IMCK[j]
 418          * CMK[j] = last 20 octets of IMCK[j]
 419          */
 420
 421         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 422                 return -1;
 423         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 424         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 425                    "Inner Methods Compound Keys",
 426                    isk, sizeof(isk), imck, sizeof(imck));
 427         data->simck_idx++;
 428         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 429         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 430                         data->simck, EAP_FAST_SIMCK_LEN);
 431         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, 20);
 432         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", data->cmk, 20);
 433
 434         return 0;
 435 }
 436
 437
 438 static void * eap_fast_init(struct eap_sm *sm)
 439 {
 440         struct eap_fast_data *data;
 441         u8 ciphers[5] = {
 442                 TLS_CIPHER_ANON_DH_AES128_SHA,
 443                 TLS_CIPHER_AES128_SHA,
 444                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 445                 TLS_CIPHER_RC4_SHA,
 446                 TLS_CIPHER_NONE
 447         };
 448
 449         data = os_zalloc(sizeof(*data));
 450         if (data == NULL)
 451                 return NULL;
 452         data->fast_version = EAP_FAST_VERSION;
 453         data->force_version = -1;
 454         if (sm->user && sm->user->force_version >= 0) {
 455                 data->force_version = sm->user->force_version;
 456                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 457                            data->force_version);
 458                 data->fast_version = data->force_version;
 459         }
 460         data->state = START;
 461
 462         if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
 463                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 464                 eap_fast_reset(sm, data);
 465                 return NULL;
 466         }
 467
 468         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 469                                            ciphers) < 0) {
 470                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 471                            "suites");
 472                 eap_fast_reset(sm, data);
 473                 return NULL;
 474         }
 475
 476         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 477                                                  eap_fast_session_ticket_cb,
 478                                                  data) < 0) {
 479                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 480                            "callback");
 481                 eap_fast_reset(sm, data);
 482                 return NULL;
 483         }
 484
 485         if (sm->pac_opaque_encr_key == NULL) {
 486                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 487                            "configured");
 488                 eap_fast_reset(sm, data);
 489                 return NULL;
 490         }
 491         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 492                   sizeof(data->pac_opaque_encr));
 493
 494         if (sm->eap_fast_a_id == NULL) {
 495                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 496                 eap_fast_reset(sm, data);
 497                 return NULL;
 498         }
 499         data->srv_id = os_strdup(sm->eap_fast_a_id);
 500         if (data->srv_id == NULL) {
 501                 eap_fast_reset(sm, data);
 502                 return NULL;
 503         }
 504
 505         return data;
 506 }
 507
 508
 509 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 510 {
 511         struct eap_fast_data *data = priv;
 512         if (data == NULL)
 513                 return;
 514         if (data->phase2_priv && data->phase2_method)
 515                 data->phase2_method->reset(sm, data->phase2_priv);
 516         eap_server_tls_ssl_deinit(sm, &data->ssl);
 517         os_free(data->srv_id);
 518         os_free(data->key_block_p);
 519         wpabuf_free(data->pending_phase2_resp);
 520         os_free(data);
 521 }
 522
 523
 524 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
 525                                             struct eap_fast_data *data, u8 id)
 526 {
 527         struct wpabuf *req;
 528         struct pac_tlv_hdr *a_id;
 529         size_t srv_id_len = os_strlen(data->srv_id);
 530
 531         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 532                             1 + sizeof(*a_id) + srv_id_len,
 533                             EAP_CODE_REQUEST, id);
 534         if (req == NULL) {
 535                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 536                            " request");
 537                 eap_fast_state(data, FAILURE);
 538                 return NULL;
 539         }
 540
 541         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 542         a_id = wpabuf_put(req, sizeof(*a_id));
 543         a_id->type = host_to_be16(PAC_TYPE_A_ID);
 544         a_id->len = host_to_be16(srv_id_len);
 545         wpabuf_put_data(req, data->srv_id, srv_id_len);
 546
 547         eap_fast_state(data, PHASE1);
 548
 549         return req;
 550 }
 551
 552
 553 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 554 {
 555         char cipher[64];
 556
 557         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 558
 559         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 560             < 0) {
 561                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 562                            "information");
 563                 eap_fast_state(data, FAILURE);
 564                 return -1;
 565         }
 566         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 567
 568         if (data->anon_provisioning) {
 569                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 570                 eap_fast_derive_key_provisioning(sm, data);
 571         } else
 572                 eap_fast_derive_key_auth(sm, data);
 573
 574         eap_fast_state(data, PHASE2_START);
 575
 576         return 0;
 577 }
 578
 579
 580 static struct wpabuf * eap_fast_build_req(struct eap_sm *sm,
 581                                           struct eap_fast_data *data, u8 id)
 582 {
 583         int res;
 584         struct wpabuf *req;
 585
 586         res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_FAST,
 587                                              data->fast_version, id, &req);
 588
 589         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 590                 if (eap_fast_phase1_done(sm, data) < 0) {
 591                         os_free(req);
 592                         return NULL;
 593                 }
 594         }
 595
 596         if (res == 1)
 597                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 598                                                 data->fast_version);
 599         return req;
 600 }
 601
 602
 603 static struct wpabuf * eap_fast_encrypt(struct eap_sm *sm,
 604                                         struct eap_fast_data *data,
 605                                         u8 id, u8 *plain, size_t plain_len)
 606 {
 607         int res;
 608         struct wpabuf *buf;
 609
 610         /* TODO: add support for fragmentation, if needed. This will need to
 611          * add TLS Message Length field, if the frame is fragmented. */
 612         buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 613                             1 + data->ssl.tls_out_limit,
 614                             EAP_CODE_REQUEST, id);
 615         if (buf == NULL)
 616                 return NULL;
 617
 618         wpabuf_put_u8(buf, data->fast_version);
 619
 620         res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
 621                                      plain, plain_len, wpabuf_put(buf, 0),
 622                                      data->ssl.tls_out_limit);
 623         if (res < 0) {
 624                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt Phase 2 "
 625                            "data");
 626                 wpabuf_free(buf);
 627                 return NULL;
 628         }
 629
 630         wpabuf_put(buf, res);
 631         eap_update_len(buf);
 632
 633         return buf;
 634 }
 635
 636
 637 static struct wpabuf * eap_fast_tlv_eap_payload(struct wpabuf *buf)
 638 {
 639         struct wpabuf *e;
 640         struct eap_tlv_hdr *tlv;
 641
 642         if (buf == NULL)
 643                 return NULL;
 644
 645         /* Encapsulate EAP packet in EAP-Payload TLV */
 646         wpa_printf(MSG_DEBUG, "EAP-FAST: Add EAP-Payload TLV");
 647         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 648         if (e == NULL) {
 649                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 650                            "for TLV encapsulation");
 651                 wpabuf_free(buf);
 652                 return NULL;
 653         }
 654         tlv = wpabuf_put(e, sizeof(*tlv));
 655         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 656                                      EAP_TLV_EAP_PAYLOAD_TLV);
 657         tlv->length = host_to_be16(wpabuf_len(buf));
 658         wpabuf_put_buf(e, buf);
 659         wpabuf_free(buf);
 660         return e;
 661 }
 662
 663
 664 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 665                                                  struct eap_fast_data *data,
 666                                                  u8 id)
 667 {
 668         struct wpabuf *req;
 669
 670         if (data->phase2_priv == NULL) {
 671                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 672                            "initialized");
 673                 return NULL;
 674         }
 675         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 676         if (req == NULL)
 677                 return NULL;
 678
 679         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 680         return eap_fast_tlv_eap_payload(req);
 681 }
 682
 683
 684 static struct wpabuf * eap_fast_build_crypto_binding(
 685         struct eap_sm *sm, struct eap_fast_data *data)
 686 {
 687         struct wpabuf *buf;
 688         struct eap_tlv_result_tlv *result;
 689         struct eap_tlv_crypto_binding__tlv *binding;
 690         int type;
 691
 692         buf = wpabuf_alloc(sizeof(*result) + sizeof(*binding));
 693         if (buf == NULL)
 694                 return NULL;
 695
 696         if (data->send_new_pac || data->anon_provisioning) {
 697                 type = EAP_TLV_INTERMEDIATE_RESULT_TLV;
 698                 data->final_result = 0;
 699         } else {
 700                 type = EAP_TLV_RESULT_TLV;
 701                 data->final_result = 1;
 702         }
 703
 704         /* Result TLV */
 705         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 706         result = wpabuf_put(buf, sizeof(*result));
 707         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | type);
 708         result->length = host_to_be16(2);
 709         result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 710
 711         /* Crypto-Binding TLV */
 712         binding = wpabuf_put(buf, sizeof(*binding));
 713         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 714                                          EAP_TLV_CRYPTO_BINDING_TLV);
 715         binding->length = host_to_be16(sizeof(*binding) -
 716                                        sizeof(struct eap_tlv_hdr));
 717         binding->version = EAP_FAST_VERSION;
 718         binding->received_version = data->peer_version;
 719         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 720         if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
 721                 wpabuf_free(buf);
 722                 return NULL;
 723         }
 724
 725         /*
 726          * RFC 4851, Section 4.2.8:
 727          * The nonce in a request MUST have its least significant bit set to 0.
 728          */
 729         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 730
 731         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 732                   sizeof(binding->nonce));
 733
 734         /*
 735          * RFC 4851, Section 5.3:
 736          * CMK = CMK[j]
 737          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 738          */
 739
 740         hmac_sha1(data->cmk, 20, (u8 *) binding, sizeof(*binding),
 741                   binding->compound_mac);
 742
 743         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 744                    "Received Version %d SubType %d",
 745                    binding->version, binding->received_version,
 746                    binding->subtype);
 747         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 748                     binding->nonce, sizeof(binding->nonce));
 749         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 750                     binding->compound_mac, sizeof(binding->compound_mac));
 751
 752         return buf;
 753 }
 754
 755
 756 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 757                                           struct eap_fast_data *data)
 758 {
 759         u8 pac_key[2 + EAP_FAST_PAC_KEY_LEN + 6];
 760         u8 pac_opaque[8 + EAP_FAST_PAC_KEY_LEN + 8];
 761         struct wpabuf *buf;
 762         u8 *pos;
 763         size_t buf_len, srv_id_len;
 764         struct eap_tlv_hdr *pac_tlv;
 765         struct pac_tlv_hdr *hdr, *pac_info;
 766         struct eap_tlv_result_tlv *result;
 767         struct os_time now;
 768
 769         srv_id_len = os_strlen(data->srv_id);
 770
 771         pac_key[0] = PAC_OPAQUE_TYPE_KEY;
 772         pac_key[1] = EAP_FAST_PAC_KEY_LEN;
 773         if (os_get_random(pac_key + 2, EAP_FAST_PAC_KEY_LEN) < 0)
 774                 return NULL;
 775         if (os_get_time(&now) < 0)
 776                 return NULL;
 777         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 778                         pac_key + 2, EAP_FAST_PAC_KEY_LEN);
 779         pos = pac_key + 2 + EAP_FAST_PAC_KEY_LEN;
 780         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 781         *pos++ = 4;
 782         WPA_PUT_BE32(pos, now.sec + PAC_KEY_LIFETIME);
 783
 784         if (aes_wrap(data->pac_opaque_encr, sizeof(pac_key) / 8, pac_key,
 785                      pac_opaque) < 0)
 786                 return NULL;
 787
 788         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 789                     pac_opaque, sizeof(pac_opaque));
 790
 791         buf_len = sizeof(*pac_tlv) +
 792                 sizeof(*hdr) + EAP_FAST_PAC_KEY_LEN +
 793                 sizeof(*hdr) + sizeof(pac_opaque) +
 794                 2 * srv_id_len + 100 + sizeof(*result);
 795         buf = wpabuf_alloc(buf_len);
 796         if (buf == NULL)
 797                 return NULL;
 798
 799         /* PAC TLV */
 800         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 801         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 802         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 803                                          EAP_TLV_PAC_TLV);
 804
 805         /* PAC-Key */
 806         hdr = wpabuf_put(buf, sizeof(*hdr));
 807         hdr->type = host_to_be16(PAC_TYPE_PAC_KEY);
 808         hdr->len = host_to_be16(EAP_FAST_PAC_KEY_LEN);
 809         wpabuf_put_data(buf, pac_key + 2, EAP_FAST_PAC_KEY_LEN);
 810
 811         /* PAC-Opaque */
 812         hdr = wpabuf_put(buf, sizeof(*hdr));
 813         hdr->type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
 814         hdr->len = host_to_be16(sizeof(pac_opaque));
 815         wpabuf_put_data(buf, pac_opaque, sizeof(pac_opaque));
 816
 817         /* PAC-Info */
 818         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 819         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 820
 821         /* PAC-Lifetime (inside PAC-Info) */
 822         hdr = wpabuf_put(buf, sizeof(*hdr));
 823         hdr->type = host_to_be16(PAC_TYPE_CRED_LIFETIME);
 824         hdr->len = host_to_be16(4);
 825         wpabuf_put_be32(buf, now.sec + PAC_KEY_LIFETIME);
 826
 827         /* A-ID (inside PAC-Info) */
 828         hdr = wpabuf_put(buf, sizeof(*hdr));
 829         hdr->type = host_to_be16(PAC_TYPE_A_ID);
 830         hdr->len = host_to_be16(srv_id_len);
 831         wpabuf_put_data(buf, data->srv_id, srv_id_len);
 832
 833         /* Note: headers may be misaligned after A-ID */
 834
 835         /* A-ID-Info (inside PAC-Info) */
 836         hdr = wpabuf_put(buf, sizeof(*hdr));
 837         WPA_PUT_BE16((u8 *) &hdr->type, PAC_TYPE_A_ID_INFO);
 838         WPA_PUT_BE16((u8 *) &hdr->len, srv_id_len);
 839         wpabuf_put_data(buf, data->srv_id, srv_id_len);
 840
 841         /* PAC-Type (inside PAC-Info) */
 842         hdr = wpabuf_put(buf, sizeof(*hdr));
 843         WPA_PUT_BE16((u8 *) &hdr->type, PAC_TYPE_PAC_TYPE);
 844         WPA_PUT_BE16((u8 *) &hdr->len, 2);
 845         wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
 846
 847         /* Update PAC-Info and PAC TLV Length fields */
 848         pos = wpabuf_put(buf, 0);
 849         pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
 850         pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
 851
 852         /* Result TLV */
 853         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 854         result = wpabuf_put(buf, sizeof(*result));
 855         WPA_PUT_BE16((u8 *) &result->tlv_type,
 856                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 857         WPA_PUT_BE16((u8 *) &result->length, 2);
 858         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 859
 860         return buf;
 861 }
 862
 863
 864 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 865 {
 866         struct eap_fast_data *data = priv;
 867         struct wpabuf *req;
 868         struct wpabuf *encr;
 869
 870         if (data->state == START)
 871                 return eap_fast_build_start(sm, data, id);
 872
 873         if (data->state == PHASE1)
 874                 return eap_fast_build_req(sm, data, id);
 875
 876         switch (data->state) {
 877         case PHASE2_ID:
 878         case PHASE2_METHOD:
 879                 req = eap_fast_build_phase2_req(sm, data, id);
 880                 break;
 881         case CRYPTO_BINDING:
 882                 req = eap_fast_build_crypto_binding(sm, data);
 883                 break;
 884         case REQUEST_PAC:
 885                 req = eap_fast_build_pac(sm, data);
 886                 break;
 887         default:
 888                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 889                            __func__, data->state);
 890                 return NULL;
 891         }
 892
 893         if (req == NULL)
 894                 return NULL;
 895
 896         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 897                             req);
 898         encr = eap_fast_encrypt(sm, data, id, wpabuf_mhead(req),
 899                                 wpabuf_len(req));
 900         wpabuf_free(req);
 901
 902         return encr;
 903 }
 904
 905
 906 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 907                               struct wpabuf *respData)
 908 {
 909         const u8 *pos;
 910         size_t len;
 911
 912         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 913         if (pos == NULL || len < 1) {
 914                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 915                 return TRUE;
 916         }
 917
 918         return FALSE;
 919 }
 920
 921
 922 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 923                                 EapType eap_type)
 924 {
 925         if (data->phase2_priv && data->phase2_method) {
 926                 data->phase2_method->reset(sm, data->phase2_priv);
 927                 data->phase2_method = NULL;
 928                 data->phase2_priv = NULL;
 929         }
 930         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 931                                                         eap_type);
 932         if (!data->phase2_method)
 933                 return -1;
 934
 935         if (data->key_block_p) {
 936                 sm->auth_challenge = data->key_block_p->server_challenge;
 937                 sm->peer_challenge = data->key_block_p->client_challenge;
 938         }
 939         sm->init_phase2 = 1;
 940         data->phase2_priv = data->phase2_method->init(sm);
 941         sm->init_phase2 = 0;
 942         sm->auth_challenge = NULL;
 943         sm->peer_challenge = NULL;
 944
 945         return data->phase2_priv == NULL ? -1 : 0;
 946 }
 947
 948
 949 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 950                                              struct eap_fast_data *data,
 951                                              u8 *in_data, size_t in_len)
 952 {
 953         u8 next_type = EAP_TYPE_NONE;
 954         struct eap_hdr *hdr;
 955         u8 *pos;
 956         size_t left;
 957         struct wpabuf buf;
 958         const struct eap_method *m = data->phase2_method;
 959         void *priv = data->phase2_priv;
 960
 961         if (priv == NULL) {
 962                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 963                            "initialized?!", __func__);
 964                 return;
 965         }
 966
 967         hdr = (struct eap_hdr *) in_data;
 968         pos = (u8 *) (hdr + 1);
 969
 970         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 971                 left = in_len - sizeof(*hdr);
 972                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 973                             "allowed types", pos + 1, left - 1);
 974                 eap_sm_process_nak(sm, pos + 1, left - 1);
 975                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
 976                     sm->user->methods[sm->user_eap_method_index].method !=
 977                     EAP_TYPE_NONE) {
 978                         next_type = sm->user->methods[
 979                                 sm->user_eap_method_index++].method;
 980                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
 981                                    next_type);
 982                 } else {
 983                         next_type = eap_fast_req_failure(sm, data);
 984                 }
 985                 eap_fast_phase2_init(sm, data, next_type);
 986                 return;
 987         }
 988
 989         wpabuf_set(&buf, in_data, in_len);
 990
 991         if (m->check(sm, priv, &buf)) {
 992                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
 993                            "ignore the packet");
 994                 next_type = eap_fast_req_failure(sm, data);
 995                 return;
 996         }
 997
 998         m->process(sm, priv, &buf);
 999
1000         if (!m->isDone(sm, priv))
1001                 return;
1002
1003         if (!m->isSuccess(sm, priv)) {
1004                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1005                 next_type = eap_fast_req_failure(sm, data);
1006                 eap_fast_phase2_init(sm, data, next_type);
1007                 return;
1008         }
1009
1010         switch (data->state) {
1011         case PHASE2_ID:
1012                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1013                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1014                                           "Identity not found in the user "
1015                                           "database",
1016                                           sm->identity, sm->identity_len);
1017                         next_type = eap_fast_req_failure(sm, data);
1018                         break;
1019                 }
1020
1021                 eap_fast_state(data, PHASE2_METHOD);
1022                 if (data->anon_provisioning) {
1023                         /*
1024                          * Only EAP-MSCHAPv2 is allowed for anonymous
1025                          * provisioning.
1026                          */
1027                         next_type = EAP_TYPE_MSCHAPV2;
1028                         sm->user_eap_method_index = 0;
1029                 } else {
1030                         next_type = sm->user->methods[0].method;
1031                         sm->user_eap_method_index = 1;
1032                 }
1033                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1034                 break;
1035         case PHASE2_METHOD:
1036                 eap_fast_update_icmk(sm, data);
1037                 eap_fast_state(data, CRYPTO_BINDING);
1038                 next_type = EAP_TYPE_NONE;
1039                 break;
1040         case FAILURE:
1041                 break;
1042         default:
1043                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1044                            __func__, data->state);
1045                 break;
1046         }
1047
1048         eap_fast_phase2_init(sm, data, next_type);
1049 }
1050
1051
1052 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1053                                         struct eap_fast_data *data,
1054                                         u8 *in_data, size_t in_len)
1055 {
1056         struct eap_hdr *hdr;
1057         size_t len;
1058
1059         hdr = (struct eap_hdr *) in_data;
1060         if (in_len < (int) sizeof(*hdr)) {
1061                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1062                            "EAP frame (len=%d)", in_len);
1063                 eap_fast_req_failure(sm, data);
1064                 return;
1065         }
1066         len = be_to_host16(hdr->length);
1067         if (len > in_len) {
1068                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1069                            "Phase 2 EAP frame (len=%d hdr->length=%d)",
1070                            in_len, len);
1071                 eap_fast_req_failure(sm, data);
1072                 return;
1073         }
1074         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1075                    "identifier=%d length=%d", hdr->code, hdr->identifier, len);
1076         switch (hdr->code) {
1077         case EAP_CODE_RESPONSE:
1078                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1079                 break;
1080         default:
1081                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1082                            "Phase 2 EAP header", hdr->code);
1083                 break;
1084         }
1085 }
1086
1087
1088 struct eap_fast_tlv_parse {
1089         u8 *eap_payload_tlv;
1090         size_t eap_payload_tlv_len;
1091         struct eap_tlv_crypto_binding__tlv *crypto_binding;
1092         size_t crypto_binding_len;
1093         int iresult;
1094         int result;
1095         int request_action;
1096         u8 *pac;
1097         size_t pac_len;
1098 };
1099
1100
1101 static int eap_fast_parse_tlv(struct eap_fast_tlv_parse *tlv,
1102                               int tlv_type, u8 *pos, int len)
1103 {
1104         switch (tlv_type) {
1105         case EAP_TLV_EAP_PAYLOAD_TLV:
1106                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: EAP-Payload TLV",
1107                             pos, len);
1108                 if (tlv->eap_payload_tlv) {
1109                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1110                                    "EAP-Payload TLV in the message");
1111                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1112                         return -2;
1113                 }
1114                 tlv->eap_payload_tlv = pos;
1115                 tlv->eap_payload_tlv_len = len;
1116                 break;
1117         case EAP_TLV_RESULT_TLV:
1118                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Result TLV", pos, len);
1119                 if (tlv->result) {
1120                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1121                                    "Result TLV in the message");
1122                         tlv->result = EAP_TLV_RESULT_FAILURE;
1123                         return -2;
1124                 }
1125                 if (len < 2) {
1126                         wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
1127                                    "Result TLV");
1128                         tlv->result = EAP_TLV_RESULT_FAILURE;
1129                         break;
1130                 }
1131                 tlv->result = WPA_GET_BE16(pos);
1132                 if (tlv->result != EAP_TLV_RESULT_SUCCESS &&
1133                     tlv->result != EAP_TLV_RESULT_FAILURE) {
1134                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Result %d",
1135                                    tlv->result);
1136                         tlv->result = EAP_TLV_RESULT_FAILURE;
1137                 }
1138                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result: %s",
1139                            tlv->result == EAP_TLV_RESULT_SUCCESS ?
1140                            "Success" : "Failure");
1141                 break;
1142         case EAP_TLV_INTERMEDIATE_RESULT_TLV:
1143                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Intermediate Result TLV",
1144                             pos, len);
1145                 if (len < 2) {
1146                         wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
1147                                    "Intermediate-Result TLV");
1148                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1149                         break;
1150                 }
1151                 if (tlv->iresult) {
1152                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1153                                    "Intermediate-Result TLV in the message");
1154                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1155                         return -2;
1156                 }
1157                 tlv->iresult = WPA_GET_BE16(pos);
1158                 if (tlv->iresult != EAP_TLV_RESULT_SUCCESS &&
1159                     tlv->iresult != EAP_TLV_RESULT_FAILURE) {
1160                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Intermediate "
1161                                    "Result %d", tlv->iresult);
1162                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1163                 }
1164                 wpa_printf(MSG_DEBUG, "EAP-FAST: Intermediate Result: %s",
1165                            tlv->iresult == EAP_TLV_RESULT_SUCCESS ?
1166                            "Success" : "Failure");
1167                 break;
1168         case EAP_TLV_CRYPTO_BINDING_TLV:
1169                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV",
1170                             pos, len);
1171                 if (tlv->crypto_binding) {
1172                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1173                                    "Crypto-Binding TLV in the message");
1174                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1175                         return -2;
1176                 }
1177                 tlv->crypto_binding_len = sizeof(struct eap_tlv_hdr) + len;
1178                 if (tlv->crypto_binding_len < sizeof(*tlv->crypto_binding)) {
1179                         wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
1180                                    "Crypto-Binding TLV");
1181                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1182                         return -2;
1183                 }
1184                 tlv->crypto_binding = (struct eap_tlv_crypto_binding__tlv *)
1185                         (pos - sizeof(struct eap_tlv_hdr));
1186                 break;
1187         case EAP_TLV_REQUEST_ACTION_TLV:
1188                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Request-Action TLV",
1189                             pos, len);
1190                 if (tlv->request_action) {
1191                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1192                                    "Request-Action TLV in the message");
1193                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1194                         return -2;
1195                 }
1196                 if (len < 2) {
1197                         wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
1198                                    "Request-Action TLV");
1199                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1200                         break;
1201                 }
1202                 tlv->request_action = WPA_GET_BE16(pos);
1203                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request-Action: %d",
1204                            tlv->request_action);
1205                 break;
1206         case EAP_TLV_PAC_TLV:
1207                 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: PAC TLV", pos, len);
1208                 if (tlv->pac) {
1209                         wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
1210                                    "PAC TLV in the message");
1211                         tlv->iresult = EAP_TLV_RESULT_FAILURE;
1212                         return -2;
1213                 }
1214                 tlv->pac = pos;
1215                 tlv->pac_len = len;
1216                 break;
1217         default:
1218                 /* Unknown TLV */
1219                 return -1;
1220         }
1221
1222         return 0;
1223 }
1224
1225
1226 static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
1227                                struct eap_fast_tlv_parse *tlv)
1228 {
1229         int mandatory, tlv_type, len, res;
1230         u8 *pos, *end;
1231
1232         os_memset(tlv, 0, sizeof(*tlv));
1233
1234         pos = data;
1235         end = data + data_len;
1236         while (pos + 4 < end) {
1237                 mandatory = pos[0] & 0x80;
1238                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1239                 pos += 2;
1240                 len = WPA_GET_BE16(pos);
1241                 pos += 2;
1242                 if (pos + len > end) {
1243                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1244                         return -1;
1245                 }
1246                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1247                            "TLV type %d length %d%s",
1248                            tlv_type, len, mandatory ? " (mandatory)" : "");
1249
1250                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1251                 if (res == -2)
1252                         break;
1253                 if (res < 0) {
1254                         if (mandatory) {
1255                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1256                                            "mandatory TLV type %d", tlv_type);
1257                                 /* TODO: generate Nak TLV */
1258                                 break;
1259                         } else {
1260                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1261                                            "unknown optional TLV type %d",
1262                                            tlv_type);
1263                         }
1264                 }
1265
1266                 pos += len;
1267         }
1268
1269         return 0;
1270 }
1271
1272
1273 static int eap_fast_validate_crypto_binding(
1274         struct eap_fast_data *data, struct eap_tlv_crypto_binding__tlv *b,
1275         size_t bind_len)
1276 {
1277         u8 cmac[20];
1278
1279         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1280                    "Version %d Received Version %d SubType %d",
1281                    b->version, b->received_version, b->subtype);
1282         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1283                     b->nonce, sizeof(b->nonce));
1284         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1285                     b->compound_mac, sizeof(b->compound_mac));
1286
1287         if (b->version != EAP_FAST_VERSION ||
1288             b->received_version != EAP_FAST_VERSION) {
1289                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1290                            "in Crypto-Binding: version %d "
1291                            "received_version %d", b->version,
1292                            b->received_version);
1293                 return -1;
1294         }
1295
1296         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1297                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1298                            "Crypto-Binding: %d", b->subtype);
1299                 return -1;
1300         }
1301
1302         if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1303             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1304                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1305                            "Crypto-Binding");
1306                 return -1;
1307         }
1308
1309         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1310         os_memset(b->compound_mac, 0, sizeof(cmac));
1311         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1312                     "Compound MAC calculation",
1313                     (u8 *) b, bind_len);
1314         hmac_sha1(data->cmk, 20, (u8 *) b, bind_len, b->compound_mac);
1315         if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1316                 wpa_hexdump(MSG_MSGDUMP,
1317                             "EAP-FAST: Calculated Compound MAC",
1318                             b->compound_mac, sizeof(cmac));
1319                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1320                            "match");
1321                 return -1;
1322         }
1323
1324         return 0;
1325 }
1326
1327
1328 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1329 {
1330         struct eap_tlv_pac_type_tlv *tlv;
1331
1332         if (pac == NULL || len != sizeof(*tlv))
1333                 return 0;
1334
1335         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1336
1337         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1338                 be_to_host16(tlv->length) == 2 &&
1339                 be_to_host16(tlv->pac_type) == type;
1340 }
1341
1342
1343 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1344                                          struct eap_fast_data *data,
1345                                          u8 *in_data, size_t in_len)
1346 {
1347         struct eap_fast_tlv_parse tlv;
1348         int check_crypto_binding = data->state == CRYPTO_BINDING;
1349
1350         if (eap_fast_parse_tlvs(in_data, in_len, &tlv) < 0) {
1351                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1352                            "Phase 2 TLVs");
1353                 return;
1354         }
1355
1356         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1357                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1358                            "failure");
1359                 eap_fast_state(data, FAILURE);
1360                 return;
1361         }
1362
1363         if (data->state == REQUEST_PAC) {
1364                 u16 type, len, res;
1365                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1366                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1367                                    "Acknowledgement received");
1368                         eap_fast_state(data, FAILURE);
1369                         return;
1370                 }
1371
1372                 type = WPA_GET_BE16(tlv.pac);
1373                 len = WPA_GET_BE16(tlv.pac + 2);
1374                 res = WPA_GET_BE16(tlv.pac + 4);
1375
1376                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1377                     res != EAP_TLV_RESULT_SUCCESS) {
1378                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1379                                    "contain acknowledgement");
1380                         eap_fast_state(data, FAILURE);
1381                         return;
1382                 }
1383
1384                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1385                            "- PAC provisioning succeeded");
1386                 eap_fast_state(data, data->anon_provisioning ?
1387                                FAILURE : SUCCESS);
1388                 return;
1389         }
1390
1391         if (tlv.eap_payload_tlv) {
1392                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1393                                             tlv.eap_payload_tlv_len);
1394         }
1395
1396         if (check_crypto_binding) {
1397                 if (tlv.crypto_binding == NULL) {
1398                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1399                                    "TLV received");
1400                         eap_fast_state(data, FAILURE);
1401                         return;
1402                 }
1403
1404                 if (data->final_result &&
1405                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1406                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1407                                    "without Success Result");
1408                         eap_fast_state(data, FAILURE);
1409                         return;
1410                 }
1411
1412                 if (!data->final_result &&
1413                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1414                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1415                                    "without intermediate Success Result");
1416                         eap_fast_state(data, FAILURE);
1417                         return;
1418                 }
1419
1420                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1421                                                      tlv.crypto_binding_len)) {
1422                         eap_fast_state(data, FAILURE);
1423                         return;
1424                 }
1425
1426                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1427                            "received - authentication completed successfully");
1428
1429                 if (data->anon_provisioning ||
1430                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1431                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1432                                        PAC_TYPE_TUNNEL_PAC))) {
1433                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1434                                    "Tunnel PAC");
1435                         eap_fast_state(data, REQUEST_PAC);
1436                 } else if (data->send_new_pac) {
1437                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1438                                    "re-keying of Tunnel PAC");
1439                         eap_fast_state(data, REQUEST_PAC);
1440                 } else
1441                         eap_fast_state(data, SUCCESS);
1442         }
1443 }
1444
1445
1446 static void eap_fast_process_phase2(struct eap_sm *sm,
1447                                     struct eap_fast_data *data,
1448                                     const u8 *in_data, size_t in_len)
1449 {
1450         u8 *in_decrypted;
1451         int len_decrypted, res;
1452         size_t buf_len;
1453
1454         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1455                    " Phase 2", (unsigned long) in_len);
1456
1457         if (data->pending_phase2_resp) {
1458                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1459                            "skip decryption and use old data");
1460                 eap_fast_process_phase2_tlvs(
1461                         sm, data, wpabuf_mhead(data->pending_phase2_resp),
1462                         wpabuf_len(data->pending_phase2_resp));
1463                 wpabuf_free(data->pending_phase2_resp);
1464                 data->pending_phase2_resp = NULL;
1465                 return;
1466         }
1467
1468         /* FIX: get rid of const -> non-const typecast */
1469         res = eap_server_tls_data_reassemble(sm, &data->ssl, (u8 **) &in_data,
1470                                              &in_len);
1471         if (res < 0 || res == 1)
1472                 return;
1473
1474         buf_len = in_len;
1475         if (data->ssl.tls_in_total > buf_len)
1476                 buf_len = data->ssl.tls_in_total;
1477         in_decrypted = os_malloc(buf_len);
1478         if (in_decrypted == NULL) {
1479                 os_free(data->ssl.tls_in);
1480                 data->ssl.tls_in = NULL;
1481                 data->ssl.tls_in_len = 0;
1482                 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
1483                            "for decryption");
1484                 return;
1485         }
1486
1487         len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1488                                                in_data, in_len,
1489                                                in_decrypted, buf_len);
1490         os_free(data->ssl.tls_in);
1491         data->ssl.tls_in = NULL;
1492         data->ssl.tls_in_len = 0;
1493         if (len_decrypted < 0) {
1494                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1495                            "data");
1496                 os_free(in_decrypted);
1497                 eap_fast_state(data, FAILURE);
1498                 return;
1499         }
1500
1501         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1502                         in_decrypted, len_decrypted);
1503
1504         eap_fast_process_phase2_tlvs(sm, data, in_decrypted, len_decrypted);
1505
1506         if (sm->method_pending == METHOD_PENDING_WAIT) {
1507                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1508                            "pending wait state - save decrypted response");
1509                 wpabuf_free(data->pending_phase2_resp);
1510                 data->pending_phase2_resp = wpabuf_alloc_copy(in_decrypted,
1511                                                               len_decrypted);
1512         }
1513
1514         os_free(in_decrypted);
1515 }
1516
1517
1518 static void eap_fast_process(struct eap_sm *sm, void *priv,
1519                              struct wpabuf *respData)
1520 {
1521         struct eap_fast_data *data = priv;
1522         const u8 *pos;
1523         u8 flags;
1524         size_t left;
1525         unsigned int tls_msg_len;
1526         int peer_version;
1527
1528         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData,
1529                                &left);
1530         if (pos == NULL || left < 1)
1531                 return;
1532         flags = *pos++;
1533         left--;
1534         wpa_printf(MSG_DEBUG, "EAP-FAST: Received packet(len=%lu) - "
1535                    "Flags 0x%02x", (unsigned long) wpabuf_len(respData),
1536                    flags);
1537         data->peer_version = peer_version = flags & EAP_PEAP_VERSION_MASK;
1538         if (data->force_version >= 0 && peer_version != data->force_version) {
1539                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1540                            " version (forced=%d peer=%d) - reject",
1541                            data->force_version, peer_version);
1542                 eap_fast_state(data, FAILURE);
1543                 return;
1544         }
1545         if (peer_version < data->fast_version) {
1546                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1547                            "use version %d",
1548                            peer_version, data->fast_version, peer_version);
1549                 data->fast_version = peer_version;
1550         }
1551         if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
1552                 if (left < 4) {
1553                         wpa_printf(MSG_INFO, "EAP-FAST: Short frame with TLS "
1554                                    "length");
1555                         eap_fast_state(data, FAILURE);
1556                         return;
1557                 }
1558                 tls_msg_len = WPA_GET_BE32(pos);
1559                 wpa_printf(MSG_DEBUG, "EAP-FAST: TLS Message Length: %d",
1560                            tls_msg_len);
1561                 if (data->ssl.tls_in_left == 0) {
1562                         data->ssl.tls_in_total = tls_msg_len;
1563                         data->ssl.tls_in_left = tls_msg_len;
1564                         os_free(data->ssl.tls_in);
1565                         data->ssl.tls_in = NULL;
1566                         data->ssl.tls_in_len = 0;
1567                 }
1568                 pos += 4;
1569                 left -= 4;
1570         }
1571
1572         switch (data->state) {
1573         case PHASE1:
1574                 if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) <
1575                     0) {
1576                         wpa_printf(MSG_INFO, "EAP-FAST: TLS processing "
1577                                    "failed");
1578                         eap_fast_state(data, FAILURE);
1579                 }
1580
1581                 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1582                     data->ssl.tls_out_len > 0)
1583                         break;
1584
1585                 /*
1586                  * Phase 1 was completed with the received message (e.g., when
1587                  * using abbreviated handshake), so Phase 2 can be started
1588                  * immediately without having to send through an empty message
1589                  * to the peer.
1590                  */
1591
1592                 if (eap_fast_phase1_done(sm, data) < 0)
1593                         break;
1594
1595                 /* fall through to PHASE2_START */
1596         case PHASE2_START:
1597                 eap_fast_state(data, PHASE2_ID);
1598                 eap_fast_phase2_init(sm, data, EAP_TYPE_IDENTITY);
1599                 break;
1600         case PHASE2_ID:
1601         case PHASE2_METHOD:
1602         case CRYPTO_BINDING:
1603         case REQUEST_PAC:
1604                 eap_fast_process_phase2(sm, data, pos, left);
1605                 break;
1606         default:
1607                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1608                            data->state, __func__);
1609                 break;
1610         }
1611
1612         if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
1613                 wpa_printf(MSG_INFO, "EAP-FAST: Locally detected fatal error "
1614                            "in TLS processing");
1615                 eap_fast_state(data, FAILURE);
1616         }
1617 }
1618
1619
1620 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1621 {
1622         struct eap_fast_data *data = priv;
1623         return data->state == SUCCESS || data->state == FAILURE;
1624 }
1625
1626
1627 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1628 {
1629         struct eap_fast_data *data = priv;
1630         u8 *eapKeyData;
1631
1632         if (data->state != SUCCESS)
1633                 return NULL;
1634
1635         /*
1636          * RFC 4851, Section 5.4: EAP Master Session Key Genreration
1637          * MSK = T-PRF(S-IMCK[j], "Session Key Generating Function", 64)
1638          */
1639
1640         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1641         if (eapKeyData == NULL)
1642                 return NULL;
1643
1644         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
1645                    "Session Key Generating Function", (u8 *) "", 0,
1646                    eapKeyData, EAP_FAST_KEY_LEN);
1647         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (MSK)",
1648                         eapKeyData, EAP_FAST_KEY_LEN);
1649         *len = EAP_FAST_KEY_LEN;
1650
1651         return eapKeyData;
1652 }
1653
1654
1655 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1656 {
1657         struct eap_fast_data *data = priv;
1658         u8 *eapKeyData;
1659
1660         if (data->state != SUCCESS)
1661                 return NULL;
1662
1663         /*
1664          * RFC 4851, Section 5.4: EAP Master Session Key Genreration
1665          * EMSK = T-PRF(S-IMCK[j],
1666          *        "Extended Session Key Generating Function", 64)
1667          */
1668
1669         eapKeyData = os_malloc(EAP_EMSK_LEN);
1670         if (eapKeyData == NULL)
1671                 return NULL;
1672
1673         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
1674                    "Extended Session Key Generating Function",
1675                    (u8 *) "", 0, eapKeyData, EAP_EMSK_LEN);
1676         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (EMSK)",
1677                         eapKeyData, EAP_EMSK_LEN);
1678
1679         *len = EAP_EMSK_LEN;
1680
1681         return eapKeyData;
1682 }
1683
1684
1685 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1686 {
1687         struct eap_fast_data *data = priv;
1688         return data->state == SUCCESS;
1689 }
1690
1691
1692 int eap_server_fast_register(void)
1693 {
1694         struct eap_method *eap;
1695         int ret;
1696
1697         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1698                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1699         if (eap == NULL)
1700                 return -1;
1701
1702         eap->init = eap_fast_init;
1703         eap->reset = eap_fast_reset;
1704         eap->buildReq = eap_fast_buildReq;
1705         eap->check = eap_fast_check;
1706         eap->process = eap_fast_process;
1707         eap->isDone = eap_fast_isDone;
1708         eap->getKey = eap_fast_getKey;
1709         eap->get_emsk = eap_fast_get_emsk;
1710         eap->isSuccess = eap_fast_isSuccess;
1711
1712         ret = eap_server_method_register(eap);
1713         if (ret)
1714                 eap_server_method_free(eap);
1715         return ret;
1716 }