contrib/wpa_supplicant/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 #define PAC_OPAQUE_TYPE_IDENTITY 3
  35
  36 struct eap_fast_data {
  37         struct eap_ssl_data ssl;
  38         enum {
  39                 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
  40                 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
  41         } state;
  42
  43         int fast_version;
  44         const struct eap_method *phase2_method;
  45         void *phase2_priv;
  46         int force_version;
  47         int peer_version;
  48
  49         u8 crypto_binding_nonce[32];
  50         int final_result;
  51
  52         struct eap_fast_key_block_provisioning *key_block_p;
  53
  54         u8 simck[EAP_FAST_SIMCK_LEN];
  55         u8 cmk[EAP_FAST_CMK_LEN];
  56         int simck_idx;
  57
  58         u8 pac_opaque_encr[16];
  59         u8 *srv_id;
  60         size_t srv_id_len;
  61         char *srv_id_info;
  62
  63         int anon_provisioning;
  64         int send_new_pac; /* server triggered re-keying of Tunnel PAC */
  65         struct wpabuf *pending_phase2_resp;
  66         u8 *identity; /* from PAC-Opaque */
  67         size_t identity_len;
  68         int eap_seq;
  69         int tnc_started;
  70
  71         int pac_key_lifetime;
  72         int pac_key_refresh_time;
  73 };
  74
  75
  76 static int eap_fast_process_phase2_start(struct eap_sm *sm,
  77                                          struct eap_fast_data *data);
  78
  79
  80 static const char * eap_fast_state_txt(int state)
  81 {
  82         switch (state) {
  83         case START:
  84                 return "START";
  85         case PHASE1:
  86                 return "PHASE1";
  87         case PHASE2_START:
  88                 return "PHASE2_START";
  89         case PHASE2_ID:
  90                 return "PHASE2_ID";
  91         case PHASE2_METHOD:
  92                 return "PHASE2_METHOD";
  93         case CRYPTO_BINDING:
  94                 return "CRYPTO_BINDING";
  95         case REQUEST_PAC:
  96                 return "REQUEST_PAC";
  97         case SUCCESS:
  98                 return "SUCCESS";
  99         case FAILURE:
 100                 return "FAILURE";
 101         default:
 102                 return "Unknown?!";
 103         }
 104 }
 105
 106
 107 static void eap_fast_state(struct eap_fast_data *data, int state)
 108 {
 109         wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
 110                    eap_fast_state_txt(data->state),
 111                    eap_fast_state_txt(state));
 112         data->state = state;
 113 }
 114
 115
 116 static EapType eap_fast_req_failure(struct eap_sm *sm,
 117                                     struct eap_fast_data *data)
 118 {
 119         /* TODO: send Result TLV(FAILURE) */
 120         eap_fast_state(data, FAILURE);
 121         return EAP_TYPE_NONE;
 122 }
 123
 124
 125 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 126                                       const u8 *client_random,
 127                                       const u8 *server_random,
 128                                       u8 *master_secret)
 129 {
 130         struct eap_fast_data *data = ctx;
 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         u8 *identity = NULL;
 137         size_t identity_len = 0;
 138
 139         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
 140         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
 141                     ticket, len);
 142
 143         if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
 144                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
 145                            "SessionTicket");
 146                 return 0;
 147         }
 148
 149         pac_opaque_len = WPA_GET_BE16(ticket + 2);
 150         pac_opaque = ticket + 4;
 151         if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
 152             pac_opaque_len > len - 4) {
 153                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
 154                            "(len=%lu left=%lu)",
 155                            (unsigned long) pac_opaque_len,
 156                            (unsigned long) len);
 157                 return 0;
 158         }
 159         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
 160                     pac_opaque, pac_opaque_len);
 161
 162         buf = os_malloc(pac_opaque_len - 8);
 163         if (buf == NULL) {
 164                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 165                            "for decrypting PAC-Opaque");
 166                 return 0;
 167         }
 168
 169         if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
 170                        pac_opaque, buf) < 0) {
 171                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
 172                            "PAC-Opaque");
 173                 os_free(buf);
 174                 /*
 175                  * This may have been caused by server changing the PAC-Opaque
 176                  * encryption key, so just ignore this PAC-Opaque instead of
 177                  * failing the authentication completely. Provisioning can now
 178                  * be used to provision a new PAC.
 179                  */
 180                 return 0;
 181         }
 182
 183         end = buf + pac_opaque_len - 8;
 184         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
 185                         buf, end - buf);
 186
 187         pos = buf;
 188         while (pos + 1 < end) {
 189                 if (pos + 2 + pos[1] > end)
 190                         break;
 191
 192                 switch (*pos) {
 193                 case PAC_OPAQUE_TYPE_PAD:
 194                         pos = end;
 195                         break;
 196                 case PAC_OPAQUE_TYPE_KEY:
 197                         if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
 198                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 199                                            "PAC-Key length %d", pos[1]);
 200                                 os_free(buf);
 201                                 return -1;
 202                         }
 203                         pac_key = pos + 2;
 204                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 205                                         "decrypted PAC-Opaque",
 206                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 207                         break;
 208                 case PAC_OPAQUE_TYPE_LIFETIME:
 209                         if (pos[1] != 4) {
 210                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 211                                            "PAC-Key lifetime length %d",
 212                                            pos[1]);
 213                                 os_free(buf);
 214                                 return -1;
 215                         }
 216                         lifetime = WPA_GET_BE32(pos + 2);
 217                         break;
 218                 case PAC_OPAQUE_TYPE_IDENTITY:
 219                         identity = pos + 2;
 220                         identity_len = pos[1];
 221                         break;
 222                 }
 223
 224                 pos += 2 + pos[1];
 225         }
 226
 227         if (pac_key == NULL) {
 228                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
 229                            "PAC-Opaque");
 230                 os_free(buf);
 231                 return -1;
 232         }
 233
 234         if (identity) {
 235                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
 236                                   "PAC-Opaque", identity, identity_len);
 237                 os_free(data->identity);
 238                 data->identity = os_malloc(identity_len);
 239                 if (data->identity) {
 240                         os_memcpy(data->identity, identity, identity_len);
 241                         data->identity_len = identity_len;
 242                 }
 243         }
 244
 245         if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
 246                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
 247                            "(lifetime=%ld now=%ld)", lifetime, now.sec);
 248                 data->send_new_pac = 2;
 249                 /*
 250                  * Allow PAC to be used to allow a PAC update with some level
 251                  * of server authentication (i.e., do not fall back to full TLS
 252                  * handshake since we cannot be sure that the peer would be
 253                  * able to validate server certificate now). However, reject
 254                  * the authentication since the PAC was not valid anymore. Peer
 255                  * can connect again with the newly provisioned PAC after this.
 256                  */
 257         } else if (lifetime - now.sec < data->pac_key_refresh_time) {
 258                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
 259                            "an update if authentication succeeds");
 260                 data->send_new_pac = 1;
 261         }
 262
 263         eap_fast_derive_master_secret(pac_key, server_random, client_random,
 264                                       master_secret);
 265
 266         os_free(buf);
 267
 268         return 1;
 269 }
 270
 271
 272 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 273                                      struct eap_fast_data *data)
 274 {
 275         u8 *sks;
 276
 277         /* RFC 4851, Section 5.1:
 278          * Extra key material after TLS key_block: session_key_seed[40]
 279          */
 280
 281         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 282                                   EAP_FAST_SKS_LEN);
 283         if (sks == NULL) {
 284                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 285                            "session_key_seed");
 286                 return;
 287         }
 288
 289         /*
 290          * RFC 4851, Section 5.2:
 291          * S-IMCK[0] = session_key_seed
 292          */
 293         wpa_hexdump_key(MSG_DEBUG,
 294                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 295                         sks, EAP_FAST_SKS_LEN);
 296         data->simck_idx = 0;
 297         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 298         os_free(sks);
 299 }
 300
 301
 302 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 303                                              struct eap_fast_data *data)
 304 {
 305         os_free(data->key_block_p);
 306         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 307                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 308                                     "key expansion",
 309                                     sizeof(*data->key_block_p));
 310         if (data->key_block_p == NULL) {
 311                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 312                 return;
 313         }
 314         /*
 315          * RFC 4851, Section 5.2:
 316          * S-IMCK[0] = session_key_seed
 317          */
 318         wpa_hexdump_key(MSG_DEBUG,
 319                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 320                         data->key_block_p->session_key_seed,
 321                         sizeof(data->key_block_p->session_key_seed));
 322         data->simck_idx = 0;
 323         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 324                   EAP_FAST_SIMCK_LEN);
 325         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 326                         data->key_block_p->server_challenge,
 327                         sizeof(data->key_block_p->server_challenge));
 328         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 329                         data->key_block_p->client_challenge,
 330                         sizeof(data->key_block_p->client_challenge));
 331 }
 332
 333
 334 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 335                                    struct eap_fast_data *data,
 336                                    u8 *isk, size_t isk_len)
 337 {
 338         u8 *key;
 339         size_t key_len;
 340
 341         os_memset(isk, 0, isk_len);
 342
 343         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 344                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 345                            "available");
 346                 return -1;
 347         }
 348
 349         if (data->phase2_method->getKey == NULL)
 350                 return 0;
 351
 352         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 353                                                &key_len)) == NULL) {
 354                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 355                            "from Phase 2");
 356                 return -1;
 357         }
 358
 359         if (key_len > isk_len)
 360                 key_len = isk_len;
 361         if (key_len == 32 &&
 362             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 363             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 364                 /*
 365                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 366                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 367                  * ISK for EAP-FAST cryptobinding.
 368                  */
 369                 os_memcpy(isk, key + 16, 16);
 370                 os_memcpy(isk + 16, key, 16);
 371         } else
 372                 os_memcpy(isk, key, key_len);
 373         os_free(key);
 374
 375         return 0;
 376 }
 377
 378
 379 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 380 {
 381         u8 isk[32], imck[60];
 382
 383         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 384                    data->simck_idx + 1);
 385
 386         /*
 387          * RFC 4851, Section 5.2:
 388          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 389          *                 MSK[j], 60)
 390          * S-IMCK[j] = first 40 octets of IMCK[j]
 391          * CMK[j] = last 20 octets of IMCK[j]
 392          */
 393
 394         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 395                 return -1;
 396         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 397         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 398                    "Inner Methods Compound Keys",
 399                    isk, sizeof(isk), imck, sizeof(imck));
 400         data->simck_idx++;
 401         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 402         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 403                         data->simck, EAP_FAST_SIMCK_LEN);
 404         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 405         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 406                         data->cmk, EAP_FAST_CMK_LEN);
 407
 408         return 0;
 409 }
 410
 411
 412 static void * eap_fast_init(struct eap_sm *sm)
 413 {
 414         struct eap_fast_data *data;
 415         u8 ciphers[5] = {
 416                 TLS_CIPHER_ANON_DH_AES128_SHA,
 417                 TLS_CIPHER_AES128_SHA,
 418                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 419                 TLS_CIPHER_RC4_SHA,
 420                 TLS_CIPHER_NONE
 421         };
 422
 423         data = os_zalloc(sizeof(*data));
 424         if (data == NULL)
 425                 return NULL;
 426         data->fast_version = EAP_FAST_VERSION;
 427         data->force_version = -1;
 428         if (sm->user && sm->user->force_version >= 0) {
 429                 data->force_version = sm->user->force_version;
 430                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 431                            data->force_version);
 432                 data->fast_version = data->force_version;
 433         }
 434         data->state = START;
 435
 436         if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
 437                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 438                 eap_fast_reset(sm, data);
 439                 return NULL;
 440         }
 441
 442         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 443                                            ciphers) < 0) {
 444                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 445                            "suites");
 446                 eap_fast_reset(sm, data);
 447                 return NULL;
 448         }
 449
 450         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 451                                                  eap_fast_session_ticket_cb,
 452                                                  data) < 0) {
 453                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 454                            "callback");
 455                 eap_fast_reset(sm, data);
 456                 return NULL;
 457         }
 458
 459         if (sm->pac_opaque_encr_key == NULL) {
 460                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 461                            "configured");
 462                 eap_fast_reset(sm, data);
 463                 return NULL;
 464         }
 465         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 466                   sizeof(data->pac_opaque_encr));
 467
 468         if (sm->eap_fast_a_id == NULL) {
 469                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 470                 eap_fast_reset(sm, data);
 471                 return NULL;
 472         }
 473         data->srv_id = os_malloc(sm->eap_fast_a_id_len);
 474         if (data->srv_id == NULL) {
 475                 eap_fast_reset(sm, data);
 476                 return NULL;
 477         }
 478         os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
 479         data->srv_id_len = sm->eap_fast_a_id_len;
 480
 481         if (sm->eap_fast_a_id_info == NULL) {
 482                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
 483                 eap_fast_reset(sm, data);
 484                 return NULL;
 485         }
 486         data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
 487         if (data->srv_id_info == NULL) {
 488                 eap_fast_reset(sm, data);
 489                 return NULL;
 490         }
 491
 492         /* PAC-Key lifetime in seconds (hard limit) */
 493         data->pac_key_lifetime = sm->pac_key_lifetime;
 494
 495         /*
 496          * PAC-Key refresh time in seconds (soft limit on remaining hard
 497          * limit). The server will generate a new PAC-Key when this number of
 498          * seconds (or fewer) of the lifetime remains.
 499          */
 500         data->pac_key_refresh_time = sm->pac_key_refresh_time;
 501
 502         return data;
 503 }
 504
 505
 506 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 507 {
 508         struct eap_fast_data *data = priv;
 509         if (data == NULL)
 510                 return;
 511         if (data->phase2_priv && data->phase2_method)
 512                 data->phase2_method->reset(sm, data->phase2_priv);
 513         eap_server_tls_ssl_deinit(sm, &data->ssl);
 514         os_free(data->srv_id);
 515         os_free(data->srv_id_info);
 516         os_free(data->key_block_p);
 517         wpabuf_free(data->pending_phase2_resp);
 518         os_free(data->identity);
 519         os_free(data);
 520 }
 521
 522
 523 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
 524                                             struct eap_fast_data *data, u8 id)
 525 {
 526         struct wpabuf *req;
 527
 528         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 529                             1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
 530                             EAP_CODE_REQUEST, id);
 531         if (req == NULL) {
 532                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 533                            " request");
 534                 eap_fast_state(data, FAILURE);
 535                 return NULL;
 536         }
 537
 538         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 539
 540         /* RFC 4851, 4.1.1. Authority ID Data */
 541         eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 542
 543         eap_fast_state(data, PHASE1);
 544
 545         return req;
 546 }
 547
 548
 549 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 550 {
 551         char cipher[64];
 552
 553         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 554
 555         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 556             < 0) {
 557                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 558                            "information");
 559                 eap_fast_state(data, FAILURE);
 560                 return -1;
 561         }
 562         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 563
 564         if (data->anon_provisioning) {
 565                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 566                 eap_fast_derive_key_provisioning(sm, data);
 567         } else
 568                 eap_fast_derive_key_auth(sm, data);
 569
 570         eap_fast_state(data, PHASE2_START);
 571
 572         return 0;
 573 }
 574
 575
 576 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 577                                                  struct eap_fast_data *data,
 578                                                  u8 id)
 579 {
 580         struct wpabuf *req;
 581
 582         if (data->phase2_priv == NULL) {
 583                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 584                            "initialized");
 585                 return NULL;
 586         }
 587         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 588         if (req == NULL)
 589                 return NULL;
 590
 591         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 592         return eap_fast_tlv_eap_payload(req);
 593 }
 594
 595
 596 static struct wpabuf * eap_fast_build_crypto_binding(
 597         struct eap_sm *sm, struct eap_fast_data *data)
 598 {
 599         struct wpabuf *buf;
 600         struct eap_tlv_result_tlv *result;
 601         struct eap_tlv_crypto_binding_tlv *binding;
 602
 603         buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
 604         if (buf == NULL)
 605                 return NULL;
 606
 607         if (data->send_new_pac || data->anon_provisioning ||
 608             data->phase2_method)
 609                 data->final_result = 0;
 610         else
 611                 data->final_result = 1;
 612
 613         if (!data->final_result || data->eap_seq > 1) {
 614                 /* Intermediate-Result */
 615                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
 616                            "(status=SUCCESS)");
 617                 result = wpabuf_put(buf, sizeof(*result));
 618                 result->tlv_type = host_to_be16(
 619                         EAP_TLV_TYPE_MANDATORY |
 620                         EAP_TLV_INTERMEDIATE_RESULT_TLV);
 621                 result->length = host_to_be16(2);
 622                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 623         }
 624
 625         if (data->final_result) {
 626                 /* Result TLV */
 627                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
 628                            "(status=SUCCESS)");
 629                 result = wpabuf_put(buf, sizeof(*result));
 630                 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 631                                                 EAP_TLV_RESULT_TLV);
 632                 result->length = host_to_be16(2);
 633                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 634         }
 635
 636         /* Crypto-Binding TLV */
 637         binding = wpabuf_put(buf, sizeof(*binding));
 638         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 639                                          EAP_TLV_CRYPTO_BINDING_TLV);
 640         binding->length = host_to_be16(sizeof(*binding) -
 641                                        sizeof(struct eap_tlv_hdr));
 642         binding->version = EAP_FAST_VERSION;
 643         binding->received_version = data->peer_version;
 644         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 645         if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
 646                 wpabuf_free(buf);
 647                 return NULL;
 648         }
 649
 650         /*
 651          * RFC 4851, Section 4.2.8:
 652          * The nonce in a request MUST have its least significant bit set to 0.
 653          */
 654         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 655
 656         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 657                   sizeof(binding->nonce));
 658
 659         /*
 660          * RFC 4851, Section 5.3:
 661          * CMK = CMK[j]
 662          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 663          */
 664
 665         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
 666                   (u8 *) binding, sizeof(*binding),
 667                   binding->compound_mac);
 668
 669         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 670                    "Received Version %d SubType %d",
 671                    binding->version, binding->received_version,
 672                    binding->subtype);
 673         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 674                     binding->nonce, sizeof(binding->nonce));
 675         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 676                     binding->compound_mac, sizeof(binding->compound_mac));
 677
 678         return buf;
 679 }
 680
 681
 682 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 683                                           struct eap_fast_data *data)
 684 {
 685         u8 pac_key[EAP_FAST_PAC_KEY_LEN];
 686         u8 *pac_buf, *pac_opaque;
 687         struct wpabuf *buf;
 688         u8 *pos;
 689         size_t buf_len, srv_id_info_len, pac_len;
 690         struct eap_tlv_hdr *pac_tlv;
 691         struct pac_tlv_hdr *pac_info;
 692         struct eap_tlv_result_tlv *result;
 693         struct os_time now;
 694
 695         if (os_get_random(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
 696             os_get_time(&now) < 0)
 697                 return NULL;
 698         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 699                         pac_key, EAP_FAST_PAC_KEY_LEN);
 700
 701         pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
 702                 (2 + sm->identity_len) + 8;
 703         pac_buf = os_malloc(pac_len);
 704         if (pac_buf == NULL)
 705                 return NULL;
 706
 707         srv_id_info_len = os_strlen(data->srv_id_info);
 708
 709         pos = pac_buf;
 710         *pos++ = PAC_OPAQUE_TYPE_KEY;
 711         *pos++ = EAP_FAST_PAC_KEY_LEN;
 712         os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
 713         pos += EAP_FAST_PAC_KEY_LEN;
 714
 715         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 716         *pos++ = 4;
 717         WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
 718         pos += 4;
 719
 720         if (sm->identity) {
 721                 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
 722                 *pos++ = sm->identity_len;
 723                 os_memcpy(pos, sm->identity, sm->identity_len);
 724                 pos += sm->identity_len;
 725         }
 726
 727         pac_len = pos - pac_buf;
 728         while (pac_len % 8) {
 729                 *pos++ = PAC_OPAQUE_TYPE_PAD;
 730                 pac_len++;
 731         }
 732
 733         pac_opaque = os_malloc(pac_len + 8);
 734         if (pac_opaque == NULL) {
 735                 os_free(pac_buf);
 736                 return NULL;
 737         }
 738         if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
 739                      pac_opaque) < 0) {
 740                 os_free(pac_buf);
 741                 os_free(pac_opaque);
 742                 return NULL;
 743         }
 744         os_free(pac_buf);
 745
 746         pac_len += 8;
 747         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 748                     pac_opaque, pac_len);
 749
 750         buf_len = sizeof(*pac_tlv) +
 751                 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
 752                 sizeof(struct pac_tlv_hdr) + pac_len +
 753                 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
 754         buf = wpabuf_alloc(buf_len);
 755         if (buf == NULL) {
 756                 os_free(pac_opaque);
 757                 return NULL;
 758         }
 759
 760         /* Result TLV */
 761         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 762         result = wpabuf_put(buf, sizeof(*result));
 763         WPA_PUT_BE16((u8 *) &result->tlv_type,
 764                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 765         WPA_PUT_BE16((u8 *) &result->length, 2);
 766         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 767
 768         /* PAC TLV */
 769         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 770         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 771         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 772                                          EAP_TLV_PAC_TLV);
 773
 774         /* PAC-Key */
 775         eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
 776
 777         /* PAC-Opaque */
 778         eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
 779         os_free(pac_opaque);
 780
 781         /* PAC-Info */
 782         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 783         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 784
 785         /* PAC-Lifetime (inside PAC-Info) */
 786         eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
 787         wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
 788
 789         /* A-ID (inside PAC-Info) */
 790         eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 791
 792         /* Note: headers may be misaligned after A-ID */
 793
 794         /* A-ID-Info (inside PAC-Info) */
 795         eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
 796                          srv_id_info_len);
 797
 798         /* PAC-Type (inside PAC-Info) */
 799         eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
 800         wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
 801
 802         /* Update PAC-Info and PAC TLV Length fields */
 803         pos = wpabuf_put(buf, 0);
 804         pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
 805         pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
 806
 807         return buf;
 808 }
 809
 810
 811 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
 812                                    struct eap_fast_data *data,
 813                                    struct wpabuf *plain, int piggyback)
 814 {
 815         struct wpabuf *encr;
 816
 817         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 818                             plain);
 819         encr = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_mhead(plain),
 820                                       wpabuf_len(plain));
 821         wpabuf_free(plain);
 822
 823         if (data->ssl.out_buf && piggyback) {
 824                 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
 825                            "(len=%d) with last Phase 1 Message (len=%d "
 826                            "used=%d)",
 827                            (int) wpabuf_len(encr),
 828                            (int) wpabuf_len(data->ssl.out_buf),
 829                            (int) data->ssl.out_used);
 830                 if (wpabuf_resize(&data->ssl.out_buf, wpabuf_len(encr)) < 0) {
 831                         wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
 832                                    "output buffer");
 833                         wpabuf_free(encr);
 834                         return -1;
 835                 }
 836                 wpabuf_put_buf(data->ssl.out_buf, encr);
 837                 wpabuf_free(encr);
 838         } else {
 839                 wpabuf_free(data->ssl.out_buf);
 840                 data->ssl.out_used = 0;
 841                 data->ssl.out_buf = encr;
 842         }
 843
 844         return 0;
 845 }
 846
 847
 848 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 849 {
 850         struct eap_fast_data *data = priv;
 851         struct wpabuf *req = NULL;
 852         int piggyback = 0;
 853
 854         if (data->ssl.state == FRAG_ACK) {
 855                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 856                                                 data->fast_version);
 857         }
 858
 859         if (data->ssl.state == WAIT_FRAG_ACK) {
 860                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 861                                                 data->fast_version, id);
 862         }
 863
 864         switch (data->state) {
 865         case START:
 866                 return eap_fast_build_start(sm, data, id);
 867         case PHASE1:
 868                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 869                         if (eap_fast_phase1_done(sm, data) < 0)
 870                                 return NULL;
 871                         if (data->state == PHASE2_START) {
 872                                 /*
 873                                  * Try to generate Phase 2 data to piggyback
 874                                  * with the end of Phase 1 to avoid extra
 875                                  * roundtrip.
 876                                  */
 877                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
 878                                            "Phase 2");
 879                                 if (eap_fast_process_phase2_start(sm, data))
 880                                         break;
 881                                 req = eap_fast_build_phase2_req(sm, data, id);
 882                                 piggyback = 1;
 883                         }
 884                 }
 885                 break;
 886         case PHASE2_ID:
 887         case PHASE2_METHOD:
 888                 req = eap_fast_build_phase2_req(sm, data, id);
 889                 break;
 890         case CRYPTO_BINDING:
 891                 req = eap_fast_build_crypto_binding(sm, data);
 892                 if (data->phase2_method) {
 893                         /*
 894                          * Include the start of the next EAP method in the
 895                          * sequence in the same message with Crypto-Binding to
 896                          * save a round-trip.
 897                          */
 898                         struct wpabuf *eap;
 899                         eap = eap_fast_build_phase2_req(sm, data, id);
 900                         req = wpabuf_concat(req, eap);
 901                         eap_fast_state(data, PHASE2_METHOD);
 902                 }
 903                 break;
 904         case REQUEST_PAC:
 905                 req = eap_fast_build_pac(sm, data);
 906                 break;
 907         default:
 908                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 909                            __func__, data->state);
 910                 return NULL;
 911         }
 912
 913         if (req &&
 914             eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
 915                 return NULL;
 916
 917         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 918                                         data->fast_version, id);
 919 }
 920
 921
 922 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 923                               struct wpabuf *respData)
 924 {
 925         const u8 *pos;
 926         size_t len;
 927
 928         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 929         if (pos == NULL || len < 1) {
 930                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 931                 return TRUE;
 932         }
 933
 934         return FALSE;
 935 }
 936
 937
 938 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 939                                 EapType eap_type)
 940 {
 941         if (data->phase2_priv && data->phase2_method) {
 942                 data->phase2_method->reset(sm, data->phase2_priv);
 943                 data->phase2_method = NULL;
 944                 data->phase2_priv = NULL;
 945         }
 946         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 947                                                         eap_type);
 948         if (!data->phase2_method)
 949                 return -1;
 950
 951         if (data->key_block_p) {
 952                 sm->auth_challenge = data->key_block_p->server_challenge;
 953                 sm->peer_challenge = data->key_block_p->client_challenge;
 954         }
 955         sm->init_phase2 = 1;
 956         data->phase2_priv = data->phase2_method->init(sm);
 957         sm->init_phase2 = 0;
 958         sm->auth_challenge = NULL;
 959         sm->peer_challenge = NULL;
 960
 961         return data->phase2_priv == NULL ? -1 : 0;
 962 }
 963
 964
 965 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 966                                              struct eap_fast_data *data,
 967                                              u8 *in_data, size_t in_len)
 968 {
 969         u8 next_type = EAP_TYPE_NONE;
 970         struct eap_hdr *hdr;
 971         u8 *pos;
 972         size_t left;
 973         struct wpabuf buf;
 974         const struct eap_method *m = data->phase2_method;
 975         void *priv = data->phase2_priv;
 976
 977         if (priv == NULL) {
 978                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 979                            "initialized?!", __func__);
 980                 return;
 981         }
 982
 983         hdr = (struct eap_hdr *) in_data;
 984         pos = (u8 *) (hdr + 1);
 985
 986         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 987                 left = in_len - sizeof(*hdr);
 988                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 989                             "allowed types", pos + 1, left - 1);
 990 #ifdef EAP_TNC
 991                 if (m && m->vendor == EAP_VENDOR_IETF &&
 992                     m->method == EAP_TYPE_TNC) {
 993                         wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
 994                                    "TNC negotiation");
 995                         next_type = eap_fast_req_failure(sm, data);
 996                         eap_fast_phase2_init(sm, data, next_type);
 997                         return;
 998                 }
 999 #endif /* EAP_TNC */
1000                 eap_sm_process_nak(sm, pos + 1, left - 1);
1001                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1002                     sm->user->methods[sm->user_eap_method_index].method !=
1003                     EAP_TYPE_NONE) {
1004                         next_type = sm->user->methods[
1005                                 sm->user_eap_method_index++].method;
1006                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1007                                    next_type);
1008                 } else {
1009                         next_type = eap_fast_req_failure(sm, data);
1010                 }
1011                 eap_fast_phase2_init(sm, data, next_type);
1012                 return;
1013         }
1014
1015         wpabuf_set(&buf, in_data, in_len);
1016
1017         if (m->check(sm, priv, &buf)) {
1018                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1019                            "ignore the packet");
1020                 next_type = eap_fast_req_failure(sm, data);
1021                 return;
1022         }
1023
1024         m->process(sm, priv, &buf);
1025
1026         if (!m->isDone(sm, priv))
1027                 return;
1028
1029         if (!m->isSuccess(sm, priv)) {
1030                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1031                 next_type = eap_fast_req_failure(sm, data);
1032                 eap_fast_phase2_init(sm, data, next_type);
1033                 return;
1034         }
1035
1036         switch (data->state) {
1037         case PHASE2_ID:
1038                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1039                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1040                                           "Identity not found in the user "
1041                                           "database",
1042                                           sm->identity, sm->identity_len);
1043                         next_type = eap_fast_req_failure(sm, data);
1044                         break;
1045                 }
1046
1047                 eap_fast_state(data, PHASE2_METHOD);
1048                 if (data->anon_provisioning) {
1049                         /*
1050                          * Only EAP-MSCHAPv2 is allowed for anonymous
1051                          * provisioning.
1052                          */
1053                         next_type = EAP_TYPE_MSCHAPV2;
1054                         sm->user_eap_method_index = 0;
1055                 } else {
1056                         next_type = sm->user->methods[0].method;
1057                         sm->user_eap_method_index = 1;
1058                 }
1059                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1060                 break;
1061         case PHASE2_METHOD:
1062         case CRYPTO_BINDING:
1063                 eap_fast_update_icmk(sm, data);
1064                 eap_fast_state(data, CRYPTO_BINDING);
1065                 data->eap_seq++;
1066                 next_type = EAP_TYPE_NONE;
1067 #ifdef EAP_TNC
1068                 if (sm->tnc && !data->tnc_started) {
1069                         wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1070                         next_type = EAP_TYPE_TNC;
1071                         data->tnc_started = 1;
1072                 }
1073 #endif /* EAP_TNC */
1074                 break;
1075         case FAILURE:
1076                 break;
1077         default:
1078                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1079                            __func__, data->state);
1080                 break;
1081         }
1082
1083         eap_fast_phase2_init(sm, data, next_type);
1084 }
1085
1086
1087 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1088                                         struct eap_fast_data *data,
1089                                         u8 *in_data, size_t in_len)
1090 {
1091         struct eap_hdr *hdr;
1092         size_t len;
1093
1094         hdr = (struct eap_hdr *) in_data;
1095         if (in_len < (int) sizeof(*hdr)) {
1096                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1097                            "EAP frame (len=%lu)", (unsigned long) in_len);
1098                 eap_fast_req_failure(sm, data);
1099                 return;
1100         }
1101         len = be_to_host16(hdr->length);
1102         if (len > in_len) {
1103                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1104                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1105                            (unsigned long) in_len, (unsigned long) len);
1106                 eap_fast_req_failure(sm, data);
1107                 return;
1108         }
1109         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1110                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1111                    (unsigned long) len);
1112         switch (hdr->code) {
1113         case EAP_CODE_RESPONSE:
1114                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1115                 break;
1116         default:
1117                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1118                            "Phase 2 EAP header", hdr->code);
1119                 break;
1120         }
1121 }
1122
1123
1124 static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
1125                                struct eap_fast_tlv_parse *tlv)
1126 {
1127         int mandatory, tlv_type, len, res;
1128         u8 *pos, *end;
1129
1130         os_memset(tlv, 0, sizeof(*tlv));
1131
1132         pos = data;
1133         end = data + data_len;
1134         while (pos + 4 < end) {
1135                 mandatory = pos[0] & 0x80;
1136                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1137                 pos += 2;
1138                 len = WPA_GET_BE16(pos);
1139                 pos += 2;
1140                 if (pos + len > end) {
1141                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1142                         return -1;
1143                 }
1144                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1145                            "TLV type %d length %d%s",
1146                            tlv_type, len, mandatory ? " (mandatory)" : "");
1147
1148                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1149                 if (res == -2)
1150                         break;
1151                 if (res < 0) {
1152                         if (mandatory) {
1153                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1154                                            "mandatory TLV type %d", tlv_type);
1155                                 /* TODO: generate Nak TLV */
1156                                 break;
1157                         } else {
1158                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1159                                            "unknown optional TLV type %d",
1160                                            tlv_type);
1161                         }
1162                 }
1163
1164                 pos += len;
1165         }
1166
1167         return 0;
1168 }
1169
1170
1171 static int eap_fast_validate_crypto_binding(
1172         struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1173         size_t bind_len)
1174 {
1175         u8 cmac[SHA1_MAC_LEN];
1176
1177         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1178                    "Version %d Received Version %d SubType %d",
1179                    b->version, b->received_version, b->subtype);
1180         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1181                     b->nonce, sizeof(b->nonce));
1182         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1183                     b->compound_mac, sizeof(b->compound_mac));
1184
1185         if (b->version != EAP_FAST_VERSION ||
1186             b->received_version != EAP_FAST_VERSION) {
1187                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1188                            "in Crypto-Binding: version %d "
1189                            "received_version %d", b->version,
1190                            b->received_version);
1191                 return -1;
1192         }
1193
1194         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1195                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1196                            "Crypto-Binding: %d", b->subtype);
1197                 return -1;
1198         }
1199
1200         if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1201             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1202                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1203                            "Crypto-Binding");
1204                 return -1;
1205         }
1206
1207         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1208         os_memset(b->compound_mac, 0, sizeof(cmac));
1209         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1210                     "Compound MAC calculation",
1211                     (u8 *) b, bind_len);
1212         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1213                   b->compound_mac);
1214         if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1215                 wpa_hexdump(MSG_MSGDUMP,
1216                             "EAP-FAST: Calculated Compound MAC",
1217                             b->compound_mac, sizeof(cmac));
1218                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1219                            "match");
1220                 return -1;
1221         }
1222
1223         return 0;
1224 }
1225
1226
1227 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1228 {
1229         struct eap_tlv_pac_type_tlv *tlv;
1230
1231         if (pac == NULL || len != sizeof(*tlv))
1232                 return 0;
1233
1234         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1235
1236         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1237                 be_to_host16(tlv->length) == 2 &&
1238                 be_to_host16(tlv->pac_type) == type;
1239 }
1240
1241
1242 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1243                                          struct eap_fast_data *data,
1244                                          u8 *in_data, size_t in_len)
1245 {
1246         struct eap_fast_tlv_parse tlv;
1247         int check_crypto_binding = data->state == CRYPTO_BINDING;
1248
1249         if (eap_fast_parse_tlvs(in_data, in_len, &tlv) < 0) {
1250                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1251                            "Phase 2 TLVs");
1252                 return;
1253         }
1254
1255         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1256                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1257                            "failure");
1258                 eap_fast_state(data, FAILURE);
1259                 return;
1260         }
1261
1262         if (data->state == REQUEST_PAC) {
1263                 u16 type, len, res;
1264                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1265                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1266                                    "Acknowledgement received");
1267                         eap_fast_state(data, FAILURE);
1268                         return;
1269                 }
1270
1271                 type = WPA_GET_BE16(tlv.pac);
1272                 len = WPA_GET_BE16(tlv.pac + 2);
1273                 res = WPA_GET_BE16(tlv.pac + 4);
1274
1275                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1276                     res != EAP_TLV_RESULT_SUCCESS) {
1277                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1278                                    "contain acknowledgement");
1279                         eap_fast_state(data, FAILURE);
1280                         return;
1281                 }
1282
1283                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1284                            "- PAC provisioning succeeded");
1285                 eap_fast_state(data, (data->anon_provisioning ||
1286                                       data->send_new_pac == 2) ?
1287                                FAILURE : SUCCESS);
1288                 return;
1289         }
1290
1291         if (check_crypto_binding) {
1292                 if (tlv.crypto_binding == NULL) {
1293                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1294                                    "TLV received");
1295                         eap_fast_state(data, FAILURE);
1296                         return;
1297                 }
1298
1299                 if (data->final_result &&
1300                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1301                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1302                                    "without Success Result");
1303                         eap_fast_state(data, FAILURE);
1304                         return;
1305                 }
1306
1307                 if (!data->final_result &&
1308                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1309                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1310                                    "without intermediate Success Result");
1311                         eap_fast_state(data, FAILURE);
1312                         return;
1313                 }
1314
1315                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1316                                                      tlv.crypto_binding_len)) {
1317                         eap_fast_state(data, FAILURE);
1318                         return;
1319                 }
1320
1321                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1322                            "received");
1323                 if (data->final_result) {
1324                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1325                                    "completed successfully");
1326                 }
1327
1328                 if (data->anon_provisioning &&
1329                     sm->eap_fast_prov != ANON_PROV &&
1330                     sm->eap_fast_prov != BOTH_PROV) {
1331                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1332                                    "use unauthenticated provisioning which is "
1333                                    "disabled");
1334                         eap_fast_state(data, FAILURE);
1335                         return;
1336                 }
1337
1338                 if (sm->eap_fast_prov != AUTH_PROV &&
1339                     sm->eap_fast_prov != BOTH_PROV &&
1340                     tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1341                     eap_fast_pac_type(tlv.pac, tlv.pac_len,
1342                                       PAC_TYPE_TUNNEL_PAC)) {
1343                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1344                                    "use authenticated provisioning which is "
1345                                    "disabled");
1346                         eap_fast_state(data, FAILURE);
1347                         return;
1348                 }
1349
1350                 if (data->anon_provisioning ||
1351                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1352                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1353                                        PAC_TYPE_TUNNEL_PAC))) {
1354                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1355                                    "Tunnel PAC");
1356                         eap_fast_state(data, REQUEST_PAC);
1357                 } else if (data->send_new_pac) {
1358                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1359                                    "re-keying of Tunnel PAC");
1360                         eap_fast_state(data, REQUEST_PAC);
1361                 } else if (data->final_result)
1362                         eap_fast_state(data, SUCCESS);
1363         }
1364
1365         if (tlv.eap_payload_tlv) {
1366                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1367                                             tlv.eap_payload_tlv_len);
1368         }
1369 }
1370
1371
1372 static void eap_fast_process_phase2(struct eap_sm *sm,
1373                                     struct eap_fast_data *data,
1374                                     struct wpabuf *in_buf)
1375 {
1376         u8 *in_decrypted;
1377         int len_decrypted;
1378         size_t buf_len;
1379         u8 *in_data;
1380         size_t in_len;
1381
1382         in_data = wpabuf_mhead(in_buf);
1383         in_len = wpabuf_len(in_buf);
1384
1385         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1386                    " Phase 2", (unsigned long) in_len);
1387
1388         if (data->pending_phase2_resp) {
1389                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1390                            "skip decryption and use old data");
1391                 eap_fast_process_phase2_tlvs(
1392                         sm, data, wpabuf_mhead(data->pending_phase2_resp),
1393                         wpabuf_len(data->pending_phase2_resp));
1394                 wpabuf_free(data->pending_phase2_resp);
1395                 data->pending_phase2_resp = NULL;
1396                 return;
1397         }
1398
1399         buf_len = in_len;
1400         /*
1401          * Even though we try to disable TLS compression, it is possible that
1402          * this cannot be done with all TLS libraries. Add extra buffer space
1403          * to handle the possibility of the decrypted data being longer than
1404          * input data.
1405          */
1406         buf_len += 500;
1407         buf_len *= 3;
1408         in_decrypted = os_malloc(buf_len);
1409         if (in_decrypted == NULL) {
1410                 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
1411                            "for decryption");
1412                 return;
1413         }
1414
1415         len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1416                                                in_data, in_len,
1417                                                in_decrypted, buf_len);
1418         if (len_decrypted < 0) {
1419                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1420                            "data");
1421                 os_free(in_decrypted);
1422                 eap_fast_state(data, FAILURE);
1423                 return;
1424         }
1425
1426         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1427                         in_decrypted, len_decrypted);
1428
1429         eap_fast_process_phase2_tlvs(sm, data, in_decrypted, len_decrypted);
1430
1431         if (sm->method_pending == METHOD_PENDING_WAIT) {
1432                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1433                            "pending wait state - save decrypted response");
1434                 wpabuf_free(data->pending_phase2_resp);
1435                 data->pending_phase2_resp = wpabuf_alloc_copy(in_decrypted,
1436                                                               len_decrypted);
1437         }
1438
1439         os_free(in_decrypted);
1440 }
1441
1442
1443 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1444                                     int peer_version)
1445 {
1446         struct eap_fast_data *data = priv;
1447
1448         data->peer_version = peer_version;
1449
1450         if (data->force_version >= 0 && peer_version != data->force_version) {
1451                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1452                            " version (forced=%d peer=%d) - reject",
1453                            data->force_version, peer_version);
1454                 return -1;
1455         }
1456
1457         if (peer_version < data->fast_version) {
1458                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1459                            "use version %d",
1460                            peer_version, data->fast_version, peer_version);
1461                 data->fast_version = peer_version;
1462         }
1463
1464         return 0;
1465 }
1466
1467
1468 static int eap_fast_process_phase1(struct eap_sm *sm,
1469                                    struct eap_fast_data *data)
1470 {
1471         if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1472                 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1473                 eap_fast_state(data, FAILURE);
1474                 return -1;
1475         }
1476
1477         if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1478             wpabuf_len(data->ssl.out_buf) > 0)
1479                 return 1;
1480
1481         /*
1482          * Phase 1 was completed with the received message (e.g., when using
1483          * abbreviated handshake), so Phase 2 can be started immediately
1484          * without having to send through an empty message to the peer.
1485          */
1486
1487         return eap_fast_phase1_done(sm, data);
1488 }
1489
1490
1491 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1492                                          struct eap_fast_data *data)
1493 {
1494         u8 next_type;
1495
1496         if (data->identity) {
1497                 os_free(sm->identity);
1498                 sm->identity = data->identity;
1499                 data->identity = NULL;
1500                 sm->identity_len = data->identity_len;
1501                 data->identity_len = 0;
1502                 sm->require_identity_match = 1;
1503                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1504                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1505                                           "Phase2 Identity not found "
1506                                           "in the user database",
1507                                           sm->identity, sm->identity_len);
1508                         next_type = eap_fast_req_failure(sm, data);
1509                 } else {
1510                         wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1511                                    "known - skip Phase 2 Identity Request");
1512                         next_type = sm->user->methods[0].method;
1513                         sm->user_eap_method_index = 1;
1514                 }
1515
1516                 eap_fast_state(data, PHASE2_METHOD);
1517         } else {
1518                 eap_fast_state(data, PHASE2_ID);
1519                 next_type = EAP_TYPE_IDENTITY;
1520         }
1521
1522         return eap_fast_phase2_init(sm, data, next_type);
1523 }
1524
1525
1526 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1527                                  const struct wpabuf *respData)
1528 {
1529         struct eap_fast_data *data = priv;
1530
1531         switch (data->state) {
1532         case PHASE1:
1533                 if (eap_fast_process_phase1(sm, data))
1534                         break;
1535
1536                 /* fall through to PHASE2_START */
1537         case PHASE2_START:
1538                 eap_fast_process_phase2_start(sm, data);
1539                 break;
1540         case PHASE2_ID:
1541         case PHASE2_METHOD:
1542         case CRYPTO_BINDING:
1543         case REQUEST_PAC:
1544                 eap_fast_process_phase2(sm, data, data->ssl.in_buf);
1545                 break;
1546         default:
1547                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1548                            data->state, __func__);
1549                 break;
1550         }
1551 }
1552
1553
1554 static void eap_fast_process(struct eap_sm *sm, void *priv,
1555                              struct wpabuf *respData)
1556 {
1557         struct eap_fast_data *data = priv;
1558         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1559                                    EAP_TYPE_FAST, eap_fast_process_version,
1560                                    eap_fast_process_msg) < 0)
1561                 eap_fast_state(data, FAILURE);
1562 }
1563
1564
1565 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1566 {
1567         struct eap_fast_data *data = priv;
1568         return data->state == SUCCESS || data->state == FAILURE;
1569 }
1570
1571
1572 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1573 {
1574         struct eap_fast_data *data = priv;
1575         u8 *eapKeyData;
1576
1577         if (data->state != SUCCESS)
1578                 return NULL;
1579
1580         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1581         if (eapKeyData == NULL)
1582                 return NULL;
1583
1584         eap_fast_derive_eap_msk(data->simck, eapKeyData);
1585         *len = EAP_FAST_KEY_LEN;
1586
1587         return eapKeyData;
1588 }
1589
1590
1591 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1592 {
1593         struct eap_fast_data *data = priv;
1594         u8 *eapKeyData;
1595
1596         if (data->state != SUCCESS)
1597                 return NULL;
1598
1599         eapKeyData = os_malloc(EAP_EMSK_LEN);
1600         if (eapKeyData == NULL)
1601                 return NULL;
1602
1603         eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1604         *len = EAP_EMSK_LEN;
1605
1606         return eapKeyData;
1607 }
1608
1609
1610 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1611 {
1612         struct eap_fast_data *data = priv;
1613         return data->state == SUCCESS;
1614 }
1615
1616
1617 int eap_server_fast_register(void)
1618 {
1619         struct eap_method *eap;
1620         int ret;
1621
1622         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1623                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1624         if (eap == NULL)
1625                 return -1;
1626
1627         eap->init = eap_fast_init;
1628         eap->reset = eap_fast_reset;
1629         eap->buildReq = eap_fast_buildReq;
1630         eap->check = eap_fast_check;
1631         eap->process = eap_fast_process;
1632         eap->isDone = eap_fast_isDone;
1633         eap->getKey = eap_fast_getKey;
1634         eap->get_emsk = eap_fast_get_emsk;
1635         eap->isSuccess = eap_fast_isSuccess;
1636
1637         ret = eap_server_method_register(eap);
1638         if (ret)
1639                 eap_server_method_free(eap);
1640         return ret;
1641 }