src/eap_server/eap_server_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 "crypto/aes_wrap.h"
  19 #include "crypto/sha1.h"
  20 #include "crypto/tls.h"
  21 #include "crypto/random.h"
  22 #include "eap_common/eap_tlv_common.h"
  23 #include "eap_common/eap_fast_common.h"
  24 #include "eap_i.h"
  25 #include "eap_tls_common.h"
  26
  27
  28 static void eap_fast_reset(struct eap_sm *sm, void *priv);
  29
  30
  31 /* Private PAC-Opaque TLV types */
  32 #define PAC_OPAQUE_TYPE_PAD 0
  33 #define PAC_OPAQUE_TYPE_KEY 1
  34 #define PAC_OPAQUE_TYPE_LIFETIME 2
  35 #define PAC_OPAQUE_TYPE_IDENTITY 3
  36
  37 struct eap_fast_data {
  38         struct eap_ssl_data ssl;
  39         enum {
  40                 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
  41                 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
  42         } state;
  43
  44         int fast_version;
  45         const struct eap_method *phase2_method;
  46         void *phase2_priv;
  47         int force_version;
  48         int peer_version;
  49
  50         u8 crypto_binding_nonce[32];
  51         int final_result;
  52
  53         struct eap_fast_key_block_provisioning *key_block_p;
  54
  55         u8 simck[EAP_FAST_SIMCK_LEN];
  56         u8 cmk[EAP_FAST_CMK_LEN];
  57         int simck_idx;
  58
  59         u8 pac_opaque_encr[16];
  60         u8 *srv_id;
  61         size_t srv_id_len;
  62         char *srv_id_info;
  63
  64         int anon_provisioning;
  65         int send_new_pac; /* server triggered re-keying of Tunnel PAC */
  66         struct wpabuf *pending_phase2_resp;
  67         u8 *identity; /* from PAC-Opaque */
  68         size_t identity_len;
  69         int eap_seq;
  70         int tnc_started;
  71
  72         int pac_key_lifetime;
  73         int pac_key_refresh_time;
  74 };
  75
  76
  77 static int eap_fast_process_phase2_start(struct eap_sm *sm,
  78                                          struct eap_fast_data *data);
  79
  80
  81 static const char * eap_fast_state_txt(int state)
  82 {
  83         switch (state) {
  84         case START:
  85                 return "START";
  86         case PHASE1:
  87                 return "PHASE1";
  88         case PHASE2_START:
  89                 return "PHASE2_START";
  90         case PHASE2_ID:
  91                 return "PHASE2_ID";
  92         case PHASE2_METHOD:
  93                 return "PHASE2_METHOD";
  94         case CRYPTO_BINDING:
  95                 return "CRYPTO_BINDING";
  96         case REQUEST_PAC:
  97                 return "REQUEST_PAC";
  98         case SUCCESS:
  99                 return "SUCCESS";
 100         case FAILURE:
 101                 return "FAILURE";
 102         default:
 103                 return "Unknown?!";
 104         }
 105 }
 106
 107
 108 static void eap_fast_state(struct eap_fast_data *data, int state)
 109 {
 110         wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
 111                    eap_fast_state_txt(data->state),
 112                    eap_fast_state_txt(state));
 113         data->state = state;
 114 }
 115
 116
 117 static EapType eap_fast_req_failure(struct eap_sm *sm,
 118                                     struct eap_fast_data *data)
 119 {
 120         /* TODO: send Result TLV(FAILURE) */
 121         eap_fast_state(data, FAILURE);
 122         return EAP_TYPE_NONE;
 123 }
 124
 125
 126 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 127                                       const u8 *client_random,
 128                                       const u8 *server_random,
 129                                       u8 *master_secret)
 130 {
 131         struct eap_fast_data *data = ctx;
 132         const u8 *pac_opaque;
 133         size_t pac_opaque_len;
 134         u8 *buf, *pos, *end, *pac_key = NULL;
 135         os_time_t lifetime = 0;
 136         struct os_time now;
 137         u8 *identity = NULL;
 138         size_t identity_len = 0;
 139
 140         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
 141         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
 142                     ticket, len);
 143
 144         if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
 145                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
 146                            "SessionTicket");
 147                 return 0;
 148         }
 149
 150         pac_opaque_len = WPA_GET_BE16(ticket + 2);
 151         pac_opaque = ticket + 4;
 152         if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
 153             pac_opaque_len > len - 4) {
 154                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
 155                            "(len=%lu left=%lu)",
 156                            (unsigned long) pac_opaque_len,
 157                            (unsigned long) len);
 158                 return 0;
 159         }
 160         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
 161                     pac_opaque, pac_opaque_len);
 162
 163         buf = os_malloc(pac_opaque_len - 8);
 164         if (buf == NULL) {
 165                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 166                            "for decrypting PAC-Opaque");
 167                 return 0;
 168         }
 169
 170         if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
 171                        pac_opaque, buf) < 0) {
 172                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
 173                            "PAC-Opaque");
 174                 os_free(buf);
 175                 /*
 176                  * This may have been caused by server changing the PAC-Opaque
 177                  * encryption key, so just ignore this PAC-Opaque instead of
 178                  * failing the authentication completely. Provisioning can now
 179                  * be used to provision a new PAC.
 180                  */
 181                 return 0;
 182         }
 183
 184         end = buf + pac_opaque_len - 8;
 185         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
 186                         buf, end - buf);
 187
 188         pos = buf;
 189         while (pos + 1 < end) {
 190                 if (pos + 2 + pos[1] > end)
 191                         break;
 192
 193                 switch (*pos) {
 194                 case PAC_OPAQUE_TYPE_PAD:
 195                         pos = end;
 196                         break;
 197                 case PAC_OPAQUE_TYPE_KEY:
 198                         if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
 199                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 200                                            "PAC-Key length %d", pos[1]);
 201                                 os_free(buf);
 202                                 return -1;
 203                         }
 204                         pac_key = pos + 2;
 205                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 206                                         "decrypted PAC-Opaque",
 207                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 208                         break;
 209                 case PAC_OPAQUE_TYPE_LIFETIME:
 210                         if (pos[1] != 4) {
 211                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 212                                            "PAC-Key lifetime length %d",
 213                                            pos[1]);
 214                                 os_free(buf);
 215                                 return -1;
 216                         }
 217                         lifetime = WPA_GET_BE32(pos + 2);
 218                         break;
 219                 case PAC_OPAQUE_TYPE_IDENTITY:
 220                         identity = pos + 2;
 221                         identity_len = pos[1];
 222                         break;
 223                 }
 224
 225                 pos += 2 + pos[1];
 226         }
 227
 228         if (pac_key == NULL) {
 229                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
 230                            "PAC-Opaque");
 231                 os_free(buf);
 232                 return -1;
 233         }
 234
 235         if (identity) {
 236                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
 237                                   "PAC-Opaque", identity, identity_len);
 238                 os_free(data->identity);
 239                 data->identity = os_malloc(identity_len);
 240                 if (data->identity) {
 241                         os_memcpy(data->identity, identity, identity_len);
 242                         data->identity_len = identity_len;
 243                 }
 244         }
 245
 246         if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
 247                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
 248                            "(lifetime=%ld now=%ld)", lifetime, now.sec);
 249                 data->send_new_pac = 2;
 250                 /*
 251                  * Allow PAC to be used to allow a PAC update with some level
 252                  * of server authentication (i.e., do not fall back to full TLS
 253                  * handshake since we cannot be sure that the peer would be
 254                  * able to validate server certificate now). However, reject
 255                  * the authentication since the PAC was not valid anymore. Peer
 256                  * can connect again with the newly provisioned PAC after this.
 257                  */
 258         } else if (lifetime - now.sec < data->pac_key_refresh_time) {
 259                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
 260                            "an update if authentication succeeds");
 261                 data->send_new_pac = 1;
 262         }
 263
 264         eap_fast_derive_master_secret(pac_key, server_random, client_random,
 265                                       master_secret);
 266
 267         os_free(buf);
 268
 269         return 1;
 270 }
 271
 272
 273 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 274                                      struct eap_fast_data *data)
 275 {
 276         u8 *sks;
 277
 278         /* RFC 4851, Section 5.1:
 279          * Extra key material after TLS key_block: session_key_seed[40]
 280          */
 281
 282         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 283                                   EAP_FAST_SKS_LEN);
 284         if (sks == NULL) {
 285                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 286                            "session_key_seed");
 287                 return;
 288         }
 289
 290         /*
 291          * RFC 4851, Section 5.2:
 292          * S-IMCK[0] = session_key_seed
 293          */
 294         wpa_hexdump_key(MSG_DEBUG,
 295                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 296                         sks, EAP_FAST_SKS_LEN);
 297         data->simck_idx = 0;
 298         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 299         os_free(sks);
 300 }
 301
 302
 303 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 304                                              struct eap_fast_data *data)
 305 {
 306         os_free(data->key_block_p);
 307         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 308                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 309                                     "key expansion",
 310                                     sizeof(*data->key_block_p));
 311         if (data->key_block_p == NULL) {
 312                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 313                 return;
 314         }
 315         /*
 316          * RFC 4851, Section 5.2:
 317          * S-IMCK[0] = session_key_seed
 318          */
 319         wpa_hexdump_key(MSG_DEBUG,
 320                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 321                         data->key_block_p->session_key_seed,
 322                         sizeof(data->key_block_p->session_key_seed));
 323         data->simck_idx = 0;
 324         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 325                   EAP_FAST_SIMCK_LEN);
 326         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 327                         data->key_block_p->server_challenge,
 328                         sizeof(data->key_block_p->server_challenge));
 329         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 330                         data->key_block_p->client_challenge,
 331                         sizeof(data->key_block_p->client_challenge));
 332 }
 333
 334
 335 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 336                                    struct eap_fast_data *data,
 337                                    u8 *isk, size_t isk_len)
 338 {
 339         u8 *key;
 340         size_t key_len;
 341
 342         os_memset(isk, 0, isk_len);
 343
 344         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 345                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 346                            "available");
 347                 return -1;
 348         }
 349
 350         if (data->phase2_method->getKey == NULL)
 351                 return 0;
 352
 353         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 354                                                &key_len)) == NULL) {
 355                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 356                            "from Phase 2");
 357                 return -1;
 358         }
 359
 360         if (key_len > isk_len)
 361                 key_len = isk_len;
 362         if (key_len == 32 &&
 363             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 364             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 365                 /*
 366                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 367                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 368                  * ISK for EAP-FAST cryptobinding.
 369                  */
 370                 os_memcpy(isk, key + 16, 16);
 371                 os_memcpy(isk + 16, key, 16);
 372         } else
 373                 os_memcpy(isk, key, key_len);
 374         os_free(key);
 375
 376         return 0;
 377 }
 378
 379
 380 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 381 {
 382         u8 isk[32], imck[60];
 383
 384         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 385                    data->simck_idx + 1);
 386
 387         /*
 388          * RFC 4851, Section 5.2:
 389          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 390          *                 MSK[j], 60)
 391          * S-IMCK[j] = first 40 octets of IMCK[j]
 392          * CMK[j] = last 20 octets of IMCK[j]
 393          */
 394
 395         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 396                 return -1;
 397         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 398         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 399                    "Inner Methods Compound Keys",
 400                    isk, sizeof(isk), imck, sizeof(imck));
 401         data->simck_idx++;
 402         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 403         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 404                         data->simck, EAP_FAST_SIMCK_LEN);
 405         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 406         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 407                         data->cmk, EAP_FAST_CMK_LEN);
 408
 409         return 0;
 410 }
 411
 412
 413 static void * eap_fast_init(struct eap_sm *sm)
 414 {
 415         struct eap_fast_data *data;
 416         u8 ciphers[5] = {
 417                 TLS_CIPHER_ANON_DH_AES128_SHA,
 418                 TLS_CIPHER_AES128_SHA,
 419                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 420                 TLS_CIPHER_RC4_SHA,
 421                 TLS_CIPHER_NONE
 422         };
 423
 424         data = os_zalloc(sizeof(*data));
 425         if (data == NULL)
 426                 return NULL;
 427         data->fast_version = EAP_FAST_VERSION;
 428         data->force_version = -1;
 429         if (sm->user && sm->user->force_version >= 0) {
 430                 data->force_version = sm->user->force_version;
 431                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 432                            data->force_version);
 433                 data->fast_version = data->force_version;
 434         }
 435         data->state = START;
 436
 437         if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
 438                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 439                 eap_fast_reset(sm, data);
 440                 return NULL;
 441         }
 442
 443         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 444                                            ciphers) < 0) {
 445                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 446                            "suites");
 447                 eap_fast_reset(sm, data);
 448                 return NULL;
 449         }
 450
 451         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 452                                                  eap_fast_session_ticket_cb,
 453                                                  data) < 0) {
 454                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 455                            "callback");
 456                 eap_fast_reset(sm, data);
 457                 return NULL;
 458         }
 459
 460         if (sm->pac_opaque_encr_key == NULL) {
 461                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 462                            "configured");
 463                 eap_fast_reset(sm, data);
 464                 return NULL;
 465         }
 466         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 467                   sizeof(data->pac_opaque_encr));
 468
 469         if (sm->eap_fast_a_id == NULL) {
 470                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 471                 eap_fast_reset(sm, data);
 472                 return NULL;
 473         }
 474         data->srv_id = os_malloc(sm->eap_fast_a_id_len);
 475         if (data->srv_id == NULL) {
 476                 eap_fast_reset(sm, data);
 477                 return NULL;
 478         }
 479         os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
 480         data->srv_id_len = sm->eap_fast_a_id_len;
 481
 482         if (sm->eap_fast_a_id_info == NULL) {
 483                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
 484                 eap_fast_reset(sm, data);
 485                 return NULL;
 486         }
 487         data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
 488         if (data->srv_id_info == NULL) {
 489                 eap_fast_reset(sm, data);
 490                 return NULL;
 491         }
 492
 493         /* PAC-Key lifetime in seconds (hard limit) */
 494         data->pac_key_lifetime = sm->pac_key_lifetime;
 495
 496         /*
 497          * PAC-Key refresh time in seconds (soft limit on remaining hard
 498          * limit). The server will generate a new PAC-Key when this number of
 499          * seconds (or fewer) of the lifetime remains.
 500          */
 501         data->pac_key_refresh_time = sm->pac_key_refresh_time;
 502
 503         return data;
 504 }
 505
 506
 507 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 508 {
 509         struct eap_fast_data *data = priv;
 510         if (data == NULL)
 511                 return;
 512         if (data->phase2_priv && data->phase2_method)
 513                 data->phase2_method->reset(sm, data->phase2_priv);
 514         eap_server_tls_ssl_deinit(sm, &data->ssl);
 515         os_free(data->srv_id);
 516         os_free(data->srv_id_info);
 517         os_free(data->key_block_p);
 518         wpabuf_free(data->pending_phase2_resp);
 519         os_free(data->identity);
 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
 529         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 530                             1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
 531                             EAP_CODE_REQUEST, id);
 532         if (req == NULL) {
 533                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 534                            " request");
 535                 eap_fast_state(data, FAILURE);
 536                 return NULL;
 537         }
 538
 539         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 540
 541         /* RFC 4851, 4.1.1. Authority ID Data */
 542         eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 543
 544         eap_fast_state(data, PHASE1);
 545
 546         return req;
 547 }
 548
 549
 550 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 551 {
 552         char cipher[64];
 553
 554         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 555
 556         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 557             < 0) {
 558                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 559                            "information");
 560                 eap_fast_state(data, FAILURE);
 561                 return -1;
 562         }
 563         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 564
 565         if (data->anon_provisioning) {
 566                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 567                 eap_fast_derive_key_provisioning(sm, data);
 568         } else
 569                 eap_fast_derive_key_auth(sm, data);
 570
 571         eap_fast_state(data, PHASE2_START);
 572
 573         return 0;
 574 }
 575
 576
 577 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 578                                                  struct eap_fast_data *data,
 579                                                  u8 id)
 580 {
 581         struct wpabuf *req;
 582
 583         if (data->phase2_priv == NULL) {
 584                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 585                            "initialized");
 586                 return NULL;
 587         }
 588         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 589         if (req == NULL)
 590                 return NULL;
 591
 592         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 593         return eap_fast_tlv_eap_payload(req);
 594 }
 595
 596
 597 static struct wpabuf * eap_fast_build_crypto_binding(
 598         struct eap_sm *sm, struct eap_fast_data *data)
 599 {
 600         struct wpabuf *buf;
 601         struct eap_tlv_result_tlv *result;
 602         struct eap_tlv_crypto_binding_tlv *binding;
 603
 604         buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
 605         if (buf == NULL)
 606                 return NULL;
 607
 608         if (data->send_new_pac || data->anon_provisioning ||
 609             data->phase2_method)
 610                 data->final_result = 0;
 611         else
 612                 data->final_result = 1;
 613
 614         if (!data->final_result || data->eap_seq > 1) {
 615                 /* Intermediate-Result */
 616                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
 617                            "(status=SUCCESS)");
 618                 result = wpabuf_put(buf, sizeof(*result));
 619                 result->tlv_type = host_to_be16(
 620                         EAP_TLV_TYPE_MANDATORY |
 621                         EAP_TLV_INTERMEDIATE_RESULT_TLV);
 622                 result->length = host_to_be16(2);
 623                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 624         }
 625
 626         if (data->final_result) {
 627                 /* Result TLV */
 628                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
 629                            "(status=SUCCESS)");
 630                 result = wpabuf_put(buf, sizeof(*result));
 631                 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 632                                                 EAP_TLV_RESULT_TLV);
 633                 result->length = host_to_be16(2);
 634                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 635         }
 636
 637         /* Crypto-Binding TLV */
 638         binding = wpabuf_put(buf, sizeof(*binding));
 639         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 640                                          EAP_TLV_CRYPTO_BINDING_TLV);
 641         binding->length = host_to_be16(sizeof(*binding) -
 642                                        sizeof(struct eap_tlv_hdr));
 643         binding->version = EAP_FAST_VERSION;
 644         binding->received_version = data->peer_version;
 645         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 646         if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
 647                 wpabuf_free(buf);
 648                 return NULL;
 649         }
 650
 651         /*
 652          * RFC 4851, Section 4.2.8:
 653          * The nonce in a request MUST have its least significant bit set to 0.
 654          */
 655         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 656
 657         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 658                   sizeof(binding->nonce));
 659
 660         /*
 661          * RFC 4851, Section 5.3:
 662          * CMK = CMK[j]
 663          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 664          */
 665
 666         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
 667                   (u8 *) binding, sizeof(*binding),
 668                   binding->compound_mac);
 669
 670         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 671                    "Received Version %d SubType %d",
 672                    binding->version, binding->received_version,
 673                    binding->subtype);
 674         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 675                     binding->nonce, sizeof(binding->nonce));
 676         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 677                     binding->compound_mac, sizeof(binding->compound_mac));
 678
 679         return buf;
 680 }
 681
 682
 683 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 684                                           struct eap_fast_data *data)
 685 {
 686         u8 pac_key[EAP_FAST_PAC_KEY_LEN];
 687         u8 *pac_buf, *pac_opaque;
 688         struct wpabuf *buf;
 689         u8 *pos;
 690         size_t buf_len, srv_id_info_len, pac_len;
 691         struct eap_tlv_hdr *pac_tlv;
 692         struct pac_tlv_hdr *pac_info;
 693         struct eap_tlv_result_tlv *result;
 694         struct os_time now;
 695
 696         if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
 697             os_get_time(&now) < 0)
 698                 return NULL;
 699         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 700                         pac_key, EAP_FAST_PAC_KEY_LEN);
 701
 702         pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
 703                 (2 + sm->identity_len) + 8;
 704         pac_buf = os_malloc(pac_len);
 705         if (pac_buf == NULL)
 706                 return NULL;
 707
 708         srv_id_info_len = os_strlen(data->srv_id_info);
 709
 710         pos = pac_buf;
 711         *pos++ = PAC_OPAQUE_TYPE_KEY;
 712         *pos++ = EAP_FAST_PAC_KEY_LEN;
 713         os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
 714         pos += EAP_FAST_PAC_KEY_LEN;
 715
 716         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 717         *pos++ = 4;
 718         WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
 719         pos += 4;
 720
 721         if (sm->identity) {
 722                 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
 723                 *pos++ = sm->identity_len;
 724                 os_memcpy(pos, sm->identity, sm->identity_len);
 725                 pos += sm->identity_len;
 726         }
 727
 728         pac_len = pos - pac_buf;
 729         while (pac_len % 8) {
 730                 *pos++ = PAC_OPAQUE_TYPE_PAD;
 731                 pac_len++;
 732         }
 733
 734         pac_opaque = os_malloc(pac_len + 8);
 735         if (pac_opaque == NULL) {
 736                 os_free(pac_buf);
 737                 return NULL;
 738         }
 739         if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
 740                      pac_opaque) < 0) {
 741                 os_free(pac_buf);
 742                 os_free(pac_opaque);
 743                 return NULL;
 744         }
 745         os_free(pac_buf);
 746
 747         pac_len += 8;
 748         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 749                     pac_opaque, pac_len);
 750
 751         buf_len = sizeof(*pac_tlv) +
 752                 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
 753                 sizeof(struct pac_tlv_hdr) + pac_len +
 754                 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
 755         buf = wpabuf_alloc(buf_len);
 756         if (buf == NULL) {
 757                 os_free(pac_opaque);
 758                 return NULL;
 759         }
 760
 761         /* Result TLV */
 762         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 763         result = wpabuf_put(buf, sizeof(*result));
 764         WPA_PUT_BE16((u8 *) &result->tlv_type,
 765                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 766         WPA_PUT_BE16((u8 *) &result->length, 2);
 767         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 768
 769         /* PAC TLV */
 770         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 771         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 772         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 773                                          EAP_TLV_PAC_TLV);
 774
 775         /* PAC-Key */
 776         eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
 777
 778         /* PAC-Opaque */
 779         eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
 780         os_free(pac_opaque);
 781
 782         /* PAC-Info */
 783         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 784         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 785
 786         /* PAC-Lifetime (inside PAC-Info) */
 787         eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
 788         wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
 789
 790         /* A-ID (inside PAC-Info) */
 791         eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 792
 793         /* Note: headers may be misaligned after A-ID */
 794
 795         if (sm->identity) {
 796                 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
 797                                  sm->identity_len);
 798         }
 799
 800         /* A-ID-Info (inside PAC-Info) */
 801         eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
 802                          srv_id_info_len);
 803
 804         /* PAC-Type (inside PAC-Info) */
 805         eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
 806         wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
 807
 808         /* Update PAC-Info and PAC TLV Length fields */
 809         pos = wpabuf_put(buf, 0);
 810         pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
 811         pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
 812
 813         return buf;
 814 }
 815
 816
 817 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
 818                                    struct eap_fast_data *data,
 819                                    struct wpabuf *plain, int piggyback)
 820 {
 821         struct wpabuf *encr;
 822
 823         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 824                             plain);
 825         encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
 826         wpabuf_free(plain);
 827
 828         if (data->ssl.tls_out && piggyback) {
 829                 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
 830                            "(len=%d) with last Phase 1 Message (len=%d "
 831                            "used=%d)",
 832                            (int) wpabuf_len(encr),
 833                            (int) wpabuf_len(data->ssl.tls_out),
 834                            (int) data->ssl.tls_out_pos);
 835                 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
 836                         wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
 837                                    "output buffer");
 838                         wpabuf_free(encr);
 839                         return -1;
 840                 }
 841                 wpabuf_put_buf(data->ssl.tls_out, encr);
 842                 wpabuf_free(encr);
 843         } else {
 844                 wpabuf_free(data->ssl.tls_out);
 845                 data->ssl.tls_out_pos = 0;
 846                 data->ssl.tls_out = encr;
 847         }
 848
 849         return 0;
 850 }
 851
 852
 853 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 854 {
 855         struct eap_fast_data *data = priv;
 856         struct wpabuf *req = NULL;
 857         int piggyback = 0;
 858
 859         if (data->ssl.state == FRAG_ACK) {
 860                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 861                                                 data->fast_version);
 862         }
 863
 864         if (data->ssl.state == WAIT_FRAG_ACK) {
 865                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 866                                                 data->fast_version, id);
 867         }
 868
 869         switch (data->state) {
 870         case START:
 871                 return eap_fast_build_start(sm, data, id);
 872         case PHASE1:
 873                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 874                         if (eap_fast_phase1_done(sm, data) < 0)
 875                                 return NULL;
 876                         if (data->state == PHASE2_START) {
 877                                 /*
 878                                  * Try to generate Phase 2 data to piggyback
 879                                  * with the end of Phase 1 to avoid extra
 880                                  * roundtrip.
 881                                  */
 882                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
 883                                            "Phase 2");
 884                                 if (eap_fast_process_phase2_start(sm, data))
 885                                         break;
 886                                 req = eap_fast_build_phase2_req(sm, data, id);
 887                                 piggyback = 1;
 888                         }
 889                 }
 890                 break;
 891         case PHASE2_ID:
 892         case PHASE2_METHOD:
 893                 req = eap_fast_build_phase2_req(sm, data, id);
 894                 break;
 895         case CRYPTO_BINDING:
 896                 req = eap_fast_build_crypto_binding(sm, data);
 897                 if (data->phase2_method) {
 898                         /*
 899                          * Include the start of the next EAP method in the
 900                          * sequence in the same message with Crypto-Binding to
 901                          * save a round-trip.
 902                          */
 903                         struct wpabuf *eap;
 904                         eap = eap_fast_build_phase2_req(sm, data, id);
 905                         req = wpabuf_concat(req, eap);
 906                         eap_fast_state(data, PHASE2_METHOD);
 907                 }
 908                 break;
 909         case REQUEST_PAC:
 910                 req = eap_fast_build_pac(sm, data);
 911                 break;
 912         default:
 913                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 914                            __func__, data->state);
 915                 return NULL;
 916         }
 917
 918         if (req &&
 919             eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
 920                 return NULL;
 921
 922         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 923                                         data->fast_version, id);
 924 }
 925
 926
 927 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 928                               struct wpabuf *respData)
 929 {
 930         const u8 *pos;
 931         size_t len;
 932
 933         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 934         if (pos == NULL || len < 1) {
 935                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 936                 return TRUE;
 937         }
 938
 939         return FALSE;
 940 }
 941
 942
 943 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 944                                 EapType eap_type)
 945 {
 946         if (data->phase2_priv && data->phase2_method) {
 947                 data->phase2_method->reset(sm, data->phase2_priv);
 948                 data->phase2_method = NULL;
 949                 data->phase2_priv = NULL;
 950         }
 951         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 952                                                         eap_type);
 953         if (!data->phase2_method)
 954                 return -1;
 955
 956         if (data->key_block_p) {
 957                 sm->auth_challenge = data->key_block_p->server_challenge;
 958                 sm->peer_challenge = data->key_block_p->client_challenge;
 959         }
 960         sm->init_phase2 = 1;
 961         data->phase2_priv = data->phase2_method->init(sm);
 962         sm->init_phase2 = 0;
 963         sm->auth_challenge = NULL;
 964         sm->peer_challenge = NULL;
 965
 966         return data->phase2_priv == NULL ? -1 : 0;
 967 }
 968
 969
 970 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 971                                              struct eap_fast_data *data,
 972                                              u8 *in_data, size_t in_len)
 973 {
 974         u8 next_type = EAP_TYPE_NONE;
 975         struct eap_hdr *hdr;
 976         u8 *pos;
 977         size_t left;
 978         struct wpabuf buf;
 979         const struct eap_method *m = data->phase2_method;
 980         void *priv = data->phase2_priv;
 981
 982         if (priv == NULL) {
 983                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 984                            "initialized?!", __func__);
 985                 return;
 986         }
 987
 988         hdr = (struct eap_hdr *) in_data;
 989         pos = (u8 *) (hdr + 1);
 990
 991         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 992                 left = in_len - sizeof(*hdr);
 993                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 994                             "allowed types", pos + 1, left - 1);
 995 #ifdef EAP_SERVER_TNC
 996                 if (m && m->vendor == EAP_VENDOR_IETF &&
 997                     m->method == EAP_TYPE_TNC) {
 998                         wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
 999                                    "TNC negotiation");
1000                         next_type = eap_fast_req_failure(sm, data);
1001                         eap_fast_phase2_init(sm, data, next_type);
1002                         return;
1003                 }
1004 #endif /* EAP_SERVER_TNC */
1005                 eap_sm_process_nak(sm, pos + 1, left - 1);
1006                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1007                     sm->user->methods[sm->user_eap_method_index].method !=
1008                     EAP_TYPE_NONE) {
1009                         next_type = sm->user->methods[
1010                                 sm->user_eap_method_index++].method;
1011                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1012                                    next_type);
1013                 } else {
1014                         next_type = eap_fast_req_failure(sm, data);
1015                 }
1016                 eap_fast_phase2_init(sm, data, next_type);
1017                 return;
1018         }
1019
1020         wpabuf_set(&buf, in_data, in_len);
1021
1022         if (m->check(sm, priv, &buf)) {
1023                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1024                            "ignore the packet");
1025                 next_type = eap_fast_req_failure(sm, data);
1026                 return;
1027         }
1028
1029         m->process(sm, priv, &buf);
1030
1031         if (!m->isDone(sm, priv))
1032                 return;
1033
1034         if (!m->isSuccess(sm, priv)) {
1035                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1036                 next_type = eap_fast_req_failure(sm, data);
1037                 eap_fast_phase2_init(sm, data, next_type);
1038                 return;
1039         }
1040
1041         switch (data->state) {
1042         case PHASE2_ID:
1043                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1044                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1045                                           "Identity not found in the user "
1046                                           "database",
1047                                           sm->identity, sm->identity_len);
1048                         next_type = eap_fast_req_failure(sm, data);
1049                         break;
1050                 }
1051
1052                 eap_fast_state(data, PHASE2_METHOD);
1053                 if (data->anon_provisioning) {
1054                         /*
1055                          * Only EAP-MSCHAPv2 is allowed for anonymous
1056                          * provisioning.
1057                          */
1058                         next_type = EAP_TYPE_MSCHAPV2;
1059                         sm->user_eap_method_index = 0;
1060                 } else {
1061                         next_type = sm->user->methods[0].method;
1062                         sm->user_eap_method_index = 1;
1063                 }
1064                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1065                 break;
1066         case PHASE2_METHOD:
1067         case CRYPTO_BINDING:
1068                 eap_fast_update_icmk(sm, data);
1069                 eap_fast_state(data, CRYPTO_BINDING);
1070                 data->eap_seq++;
1071                 next_type = EAP_TYPE_NONE;
1072 #ifdef EAP_SERVER_TNC
1073                 if (sm->tnc && !data->tnc_started) {
1074                         wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1075                         next_type = EAP_TYPE_TNC;
1076                         data->tnc_started = 1;
1077                 }
1078 #endif /* EAP_SERVER_TNC */
1079                 break;
1080         case FAILURE:
1081                 break;
1082         default:
1083                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1084                            __func__, data->state);
1085                 break;
1086         }
1087
1088         eap_fast_phase2_init(sm, data, next_type);
1089 }
1090
1091
1092 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1093                                         struct eap_fast_data *data,
1094                                         u8 *in_data, size_t in_len)
1095 {
1096         struct eap_hdr *hdr;
1097         size_t len;
1098
1099         hdr = (struct eap_hdr *) in_data;
1100         if (in_len < (int) sizeof(*hdr)) {
1101                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1102                            "EAP frame (len=%lu)", (unsigned long) in_len);
1103                 eap_fast_req_failure(sm, data);
1104                 return;
1105         }
1106         len = be_to_host16(hdr->length);
1107         if (len > in_len) {
1108                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1109                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1110                            (unsigned long) in_len, (unsigned long) len);
1111                 eap_fast_req_failure(sm, data);
1112                 return;
1113         }
1114         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1115                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1116                    (unsigned long) len);
1117         switch (hdr->code) {
1118         case EAP_CODE_RESPONSE:
1119                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1120                 break;
1121         default:
1122                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1123                            "Phase 2 EAP header", hdr->code);
1124                 break;
1125         }
1126 }
1127
1128
1129 static int eap_fast_parse_tlvs(struct wpabuf *data,
1130                                struct eap_fast_tlv_parse *tlv)
1131 {
1132         int mandatory, tlv_type, len, res;
1133         u8 *pos, *end;
1134
1135         os_memset(tlv, 0, sizeof(*tlv));
1136
1137         pos = wpabuf_mhead(data);
1138         end = pos + wpabuf_len(data);
1139         while (pos + 4 < end) {
1140                 mandatory = pos[0] & 0x80;
1141                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1142                 pos += 2;
1143                 len = WPA_GET_BE16(pos);
1144                 pos += 2;
1145                 if (pos + len > end) {
1146                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1147                         return -1;
1148                 }
1149                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1150                            "TLV type %d length %d%s",
1151                            tlv_type, len, mandatory ? " (mandatory)" : "");
1152
1153                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1154                 if (res == -2)
1155                         break;
1156                 if (res < 0) {
1157                         if (mandatory) {
1158                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1159                                            "mandatory TLV type %d", tlv_type);
1160                                 /* TODO: generate Nak TLV */
1161                                 break;
1162                         } else {
1163                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1164                                            "unknown optional TLV type %d",
1165                                            tlv_type);
1166                         }
1167                 }
1168
1169                 pos += len;
1170         }
1171
1172         return 0;
1173 }
1174
1175
1176 static int eap_fast_validate_crypto_binding(
1177         struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1178         size_t bind_len)
1179 {
1180         u8 cmac[SHA1_MAC_LEN];
1181
1182         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1183                    "Version %d Received Version %d SubType %d",
1184                    b->version, b->received_version, b->subtype);
1185         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1186                     b->nonce, sizeof(b->nonce));
1187         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1188                     b->compound_mac, sizeof(b->compound_mac));
1189
1190         if (b->version != EAP_FAST_VERSION ||
1191             b->received_version != EAP_FAST_VERSION) {
1192                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1193                            "in Crypto-Binding: version %d "
1194                            "received_version %d", b->version,
1195                            b->received_version);
1196                 return -1;
1197         }
1198
1199         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1200                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1201                            "Crypto-Binding: %d", b->subtype);
1202                 return -1;
1203         }
1204
1205         if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1206             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1207                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1208                            "Crypto-Binding");
1209                 return -1;
1210         }
1211
1212         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1213         os_memset(b->compound_mac, 0, sizeof(cmac));
1214         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1215                     "Compound MAC calculation",
1216                     (u8 *) b, bind_len);
1217         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1218                   b->compound_mac);
1219         if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1220                 wpa_hexdump(MSG_MSGDUMP,
1221                             "EAP-FAST: Calculated Compound MAC",
1222                             b->compound_mac, sizeof(cmac));
1223                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1224                            "match");
1225                 return -1;
1226         }
1227
1228         return 0;
1229 }
1230
1231
1232 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1233 {
1234         struct eap_tlv_pac_type_tlv *tlv;
1235
1236         if (pac == NULL || len != sizeof(*tlv))
1237                 return 0;
1238
1239         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1240
1241         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1242                 be_to_host16(tlv->length) == 2 &&
1243                 be_to_host16(tlv->pac_type) == type;
1244 }
1245
1246
1247 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1248                                          struct eap_fast_data *data,
1249                                          struct wpabuf *in_data)
1250 {
1251         struct eap_fast_tlv_parse tlv;
1252         int check_crypto_binding = data->state == CRYPTO_BINDING;
1253
1254         if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1255                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1256                            "Phase 2 TLVs");
1257                 return;
1258         }
1259
1260         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1261                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1262                            "failure");
1263                 eap_fast_state(data, FAILURE);
1264                 return;
1265         }
1266
1267         if (data->state == REQUEST_PAC) {
1268                 u16 type, len, res;
1269                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1270                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1271                                    "Acknowledgement received");
1272                         eap_fast_state(data, FAILURE);
1273                         return;
1274                 }
1275
1276                 type = WPA_GET_BE16(tlv.pac);
1277                 len = WPA_GET_BE16(tlv.pac + 2);
1278                 res = WPA_GET_BE16(tlv.pac + 4);
1279
1280                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1281                     res != EAP_TLV_RESULT_SUCCESS) {
1282                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1283                                    "contain acknowledgement");
1284                         eap_fast_state(data, FAILURE);
1285                         return;
1286                 }
1287
1288                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1289                            "- PAC provisioning succeeded");
1290                 eap_fast_state(data, (data->anon_provisioning ||
1291                                       data->send_new_pac == 2) ?
1292                                FAILURE : SUCCESS);
1293                 return;
1294         }
1295
1296         if (check_crypto_binding) {
1297                 if (tlv.crypto_binding == NULL) {
1298                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1299                                    "TLV received");
1300                         eap_fast_state(data, FAILURE);
1301                         return;
1302                 }
1303
1304                 if (data->final_result &&
1305                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1306                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1307                                    "without Success Result");
1308                         eap_fast_state(data, FAILURE);
1309                         return;
1310                 }
1311
1312                 if (!data->final_result &&
1313                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1314                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1315                                    "without intermediate Success Result");
1316                         eap_fast_state(data, FAILURE);
1317                         return;
1318                 }
1319
1320                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1321                                                      tlv.crypto_binding_len)) {
1322                         eap_fast_state(data, FAILURE);
1323                         return;
1324                 }
1325
1326                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1327                            "received");
1328                 if (data->final_result) {
1329                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1330                                    "completed successfully");
1331                 }
1332
1333                 if (data->anon_provisioning &&
1334                     sm->eap_fast_prov != ANON_PROV &&
1335                     sm->eap_fast_prov != BOTH_PROV) {
1336                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1337                                    "use unauthenticated provisioning which is "
1338                                    "disabled");
1339                         eap_fast_state(data, FAILURE);
1340                         return;
1341                 }
1342
1343                 if (sm->eap_fast_prov != AUTH_PROV &&
1344                     sm->eap_fast_prov != BOTH_PROV &&
1345                     tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1346                     eap_fast_pac_type(tlv.pac, tlv.pac_len,
1347                                       PAC_TYPE_TUNNEL_PAC)) {
1348                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1349                                    "use authenticated provisioning which is "
1350                                    "disabled");
1351                         eap_fast_state(data, FAILURE);
1352                         return;
1353                 }
1354
1355                 if (data->anon_provisioning ||
1356                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1357                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1358                                        PAC_TYPE_TUNNEL_PAC))) {
1359                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1360                                    "Tunnel PAC");
1361                         eap_fast_state(data, REQUEST_PAC);
1362                 } else if (data->send_new_pac) {
1363                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1364                                    "re-keying of Tunnel PAC");
1365                         eap_fast_state(data, REQUEST_PAC);
1366                 } else if (data->final_result)
1367                         eap_fast_state(data, SUCCESS);
1368         }
1369
1370         if (tlv.eap_payload_tlv) {
1371                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1372                                             tlv.eap_payload_tlv_len);
1373         }
1374 }
1375
1376
1377 static void eap_fast_process_phase2(struct eap_sm *sm,
1378                                     struct eap_fast_data *data,
1379                                     struct wpabuf *in_buf)
1380 {
1381         struct wpabuf *in_decrypted;
1382
1383         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1384                    " Phase 2", (unsigned long) wpabuf_len(in_buf));
1385
1386         if (data->pending_phase2_resp) {
1387                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1388                            "skip decryption and use old data");
1389                 eap_fast_process_phase2_tlvs(sm, data,
1390                                              data->pending_phase2_resp);
1391                 wpabuf_free(data->pending_phase2_resp);
1392                 data->pending_phase2_resp = NULL;
1393                 return;
1394         }
1395
1396         in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1397                                               in_buf);
1398         if (in_decrypted == NULL) {
1399                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1400                            "data");
1401                 eap_fast_state(data, FAILURE);
1402                 return;
1403         }
1404
1405         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1406                             in_decrypted);
1407
1408         eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1409
1410         if (sm->method_pending == METHOD_PENDING_WAIT) {
1411                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1412                            "pending wait state - save decrypted response");
1413                 wpabuf_free(data->pending_phase2_resp);
1414                 data->pending_phase2_resp = in_decrypted;
1415                 return;
1416         }
1417
1418         wpabuf_free(in_decrypted);
1419 }
1420
1421
1422 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1423                                     int peer_version)
1424 {
1425         struct eap_fast_data *data = priv;
1426
1427         data->peer_version = peer_version;
1428
1429         if (data->force_version >= 0 && peer_version != data->force_version) {
1430                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1431                            " version (forced=%d peer=%d) - reject",
1432                            data->force_version, peer_version);
1433                 return -1;
1434         }
1435
1436         if (peer_version < data->fast_version) {
1437                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1438                            "use version %d",
1439                            peer_version, data->fast_version, peer_version);
1440                 data->fast_version = peer_version;
1441         }
1442
1443         return 0;
1444 }
1445
1446
1447 static int eap_fast_process_phase1(struct eap_sm *sm,
1448                                    struct eap_fast_data *data)
1449 {
1450         if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1451                 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1452                 eap_fast_state(data, FAILURE);
1453                 return -1;
1454         }
1455
1456         if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1457             wpabuf_len(data->ssl.tls_out) > 0)
1458                 return 1;
1459
1460         /*
1461          * Phase 1 was completed with the received message (e.g., when using
1462          * abbreviated handshake), so Phase 2 can be started immediately
1463          * without having to send through an empty message to the peer.
1464          */
1465
1466         return eap_fast_phase1_done(sm, data);
1467 }
1468
1469
1470 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1471                                          struct eap_fast_data *data)
1472 {
1473         u8 next_type;
1474
1475         if (data->identity) {
1476                 os_free(sm->identity);
1477                 sm->identity = data->identity;
1478                 data->identity = NULL;
1479                 sm->identity_len = data->identity_len;
1480                 data->identity_len = 0;
1481                 sm->require_identity_match = 1;
1482                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1483                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1484                                           "Phase2 Identity not found "
1485                                           "in the user database",
1486                                           sm->identity, sm->identity_len);
1487                         next_type = eap_fast_req_failure(sm, data);
1488                 } else {
1489                         wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1490                                    "known - skip Phase 2 Identity Request");
1491                         next_type = sm->user->methods[0].method;
1492                         sm->user_eap_method_index = 1;
1493                 }
1494
1495                 eap_fast_state(data, PHASE2_METHOD);
1496         } else {
1497                 eap_fast_state(data, PHASE2_ID);
1498                 next_type = EAP_TYPE_IDENTITY;
1499         }
1500
1501         return eap_fast_phase2_init(sm, data, next_type);
1502 }
1503
1504
1505 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1506                                  const struct wpabuf *respData)
1507 {
1508         struct eap_fast_data *data = priv;
1509
1510         switch (data->state) {
1511         case PHASE1:
1512                 if (eap_fast_process_phase1(sm, data))
1513                         break;
1514
1515                 /* fall through to PHASE2_START */
1516         case PHASE2_START:
1517                 eap_fast_process_phase2_start(sm, data);
1518                 break;
1519         case PHASE2_ID:
1520         case PHASE2_METHOD:
1521         case CRYPTO_BINDING:
1522         case REQUEST_PAC:
1523                 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1524                 break;
1525         default:
1526                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1527                            data->state, __func__);
1528                 break;
1529         }
1530 }
1531
1532
1533 static void eap_fast_process(struct eap_sm *sm, void *priv,
1534                              struct wpabuf *respData)
1535 {
1536         struct eap_fast_data *data = priv;
1537         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1538                                    EAP_TYPE_FAST, eap_fast_process_version,
1539                                    eap_fast_process_msg) < 0)
1540                 eap_fast_state(data, FAILURE);
1541 }
1542
1543
1544 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1545 {
1546         struct eap_fast_data *data = priv;
1547         return data->state == SUCCESS || data->state == FAILURE;
1548 }
1549
1550
1551 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1552 {
1553         struct eap_fast_data *data = priv;
1554         u8 *eapKeyData;
1555
1556         if (data->state != SUCCESS)
1557                 return NULL;
1558
1559         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1560         if (eapKeyData == NULL)
1561                 return NULL;
1562
1563         eap_fast_derive_eap_msk(data->simck, eapKeyData);
1564         *len = EAP_FAST_KEY_LEN;
1565
1566         return eapKeyData;
1567 }
1568
1569
1570 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1571 {
1572         struct eap_fast_data *data = priv;
1573         u8 *eapKeyData;
1574
1575         if (data->state != SUCCESS)
1576                 return NULL;
1577
1578         eapKeyData = os_malloc(EAP_EMSK_LEN);
1579         if (eapKeyData == NULL)
1580                 return NULL;
1581
1582         eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1583         *len = EAP_EMSK_LEN;
1584
1585         return eapKeyData;
1586 }
1587
1588
1589 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1590 {
1591         struct eap_fast_data *data = priv;
1592         return data->state == SUCCESS;
1593 }
1594
1595
1596 int eap_server_fast_register(void)
1597 {
1598         struct eap_method *eap;
1599         int ret;
1600
1601         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1602                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1603         if (eap == NULL)
1604                 return -1;
1605
1606         eap->init = eap_fast_init;
1607         eap->reset = eap_fast_reset;
1608         eap->buildReq = eap_fast_buildReq;
1609         eap->check = eap_fast_check;
1610         eap->process = eap_fast_process;
1611         eap->isDone = eap_fast_isDone;
1612         eap->getKey = eap_fast_getKey;
1613         eap->get_emsk = eap_fast_get_emsk;
1614         eap->isSuccess = eap_fast_isSuccess;
1615
1616         ret = eap_server_method_register(eap);
1617         if (ret)
1618                 eap_server_method_free(eap);
1619         return ret;
1620 }