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 software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/aes_wrap.h"
  13 #include "crypto/sha1.h"
  14 #include "crypto/tls.h"
  15 #include "crypto/random.h"
  16 #include "eap_common/eap_tlv_common.h"
  17 #include "eap_common/eap_fast_common.h"
  18 #include "eap_i.h"
  19 #include "eap_tls_common.h"
  20
  21
  22 static void eap_fast_reset(struct eap_sm *sm, void *priv);
  23
  24
  25 /* Private PAC-Opaque TLV types */
  26 #define PAC_OPAQUE_TYPE_PAD 0
  27 #define PAC_OPAQUE_TYPE_KEY 1
  28 #define PAC_OPAQUE_TYPE_LIFETIME 2
  29 #define PAC_OPAQUE_TYPE_IDENTITY 3
  30
  31 struct eap_fast_data {
  32         struct eap_ssl_data ssl;
  33         enum {
  34                 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
  35                 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
  36         } state;
  37
  38         int fast_version;
  39         const struct eap_method *phase2_method;
  40         void *phase2_priv;
  41         int force_version;
  42         int peer_version;
  43
  44         u8 crypto_binding_nonce[32];
  45         int final_result;
  46
  47         struct eap_fast_key_block_provisioning *key_block_p;
  48
  49         u8 simck[EAP_FAST_SIMCK_LEN];
  50         u8 cmk[EAP_FAST_CMK_LEN];
  51         int simck_idx;
  52
  53         u8 pac_opaque_encr[16];
  54         u8 *srv_id;
  55         size_t srv_id_len;
  56         char *srv_id_info;
  57
  58         int anon_provisioning;
  59         int send_new_pac; /* server triggered re-keying of Tunnel PAC */
  60         struct wpabuf *pending_phase2_resp;
  61         u8 *identity; /* from PAC-Opaque */
  62         size_t identity_len;
  63         int eap_seq;
  64         int tnc_started;
  65
  66         int pac_key_lifetime;
  67         int pac_key_refresh_time;
  68 };
  69
  70
  71 static int eap_fast_process_phase2_start(struct eap_sm *sm,
  72                                          struct eap_fast_data *data);
  73
  74
  75 static const char * eap_fast_state_txt(int state)
  76 {
  77         switch (state) {
  78         case START:
  79                 return "START";
  80         case PHASE1:
  81                 return "PHASE1";
  82         case PHASE2_START:
  83                 return "PHASE2_START";
  84         case PHASE2_ID:
  85                 return "PHASE2_ID";
  86         case PHASE2_METHOD:
  87                 return "PHASE2_METHOD";
  88         case CRYPTO_BINDING:
  89                 return "CRYPTO_BINDING";
  90         case REQUEST_PAC:
  91                 return "REQUEST_PAC";
  92         case SUCCESS:
  93                 return "SUCCESS";
  94         case FAILURE:
  95                 return "FAILURE";
  96         default:
  97                 return "Unknown?!";
  98         }
  99 }
 100
 101
 102 static void eap_fast_state(struct eap_fast_data *data, int state)
 103 {
 104         wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
 105                    eap_fast_state_txt(data->state),
 106                    eap_fast_state_txt(state));
 107         data->state = state;
 108 }
 109
 110
 111 static EapType eap_fast_req_failure(struct eap_sm *sm,
 112                                     struct eap_fast_data *data)
 113 {
 114         /* TODO: send Result TLV(FAILURE) */
 115         eap_fast_state(data, FAILURE);
 116         return EAP_TYPE_NONE;
 117 }
 118
 119
 120 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 121                                       const u8 *client_random,
 122                                       const u8 *server_random,
 123                                       u8 *master_secret)
 124 {
 125         struct eap_fast_data *data = ctx;
 126         const u8 *pac_opaque;
 127         size_t pac_opaque_len;
 128         u8 *buf, *pos, *end, *pac_key = NULL;
 129         os_time_t lifetime = 0;
 130         struct os_time now;
 131         u8 *identity = NULL;
 132         size_t identity_len = 0;
 133
 134         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
 135         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
 136                     ticket, len);
 137
 138         if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
 139                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
 140                            "SessionTicket");
 141                 return 0;
 142         }
 143
 144         pac_opaque_len = WPA_GET_BE16(ticket + 2);
 145         pac_opaque = ticket + 4;
 146         if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
 147             pac_opaque_len > len - 4) {
 148                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
 149                            "(len=%lu left=%lu)",
 150                            (unsigned long) pac_opaque_len,
 151                            (unsigned long) len);
 152                 return 0;
 153         }
 154         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
 155                     pac_opaque, pac_opaque_len);
 156
 157         buf = os_malloc(pac_opaque_len - 8);
 158         if (buf == NULL) {
 159                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 160                            "for decrypting PAC-Opaque");
 161                 return 0;
 162         }
 163
 164         if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
 165                        pac_opaque, buf) < 0) {
 166                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
 167                            "PAC-Opaque");
 168                 os_free(buf);
 169                 /*
 170                  * This may have been caused by server changing the PAC-Opaque
 171                  * encryption key, so just ignore this PAC-Opaque instead of
 172                  * failing the authentication completely. Provisioning can now
 173                  * be used to provision a new PAC.
 174                  */
 175                 return 0;
 176         }
 177
 178         end = buf + pac_opaque_len - 8;
 179         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
 180                         buf, end - buf);
 181
 182         pos = buf;
 183         while (pos + 1 < end) {
 184                 if (pos + 2 + pos[1] > end)
 185                         break;
 186
 187                 switch (*pos) {
 188                 case PAC_OPAQUE_TYPE_PAD:
 189                         pos = end;
 190                         break;
 191                 case PAC_OPAQUE_TYPE_KEY:
 192                         if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
 193                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 194                                            "PAC-Key length %d", pos[1]);
 195                                 os_free(buf);
 196                                 return -1;
 197                         }
 198                         pac_key = pos + 2;
 199                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 200                                         "decrypted PAC-Opaque",
 201                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 202                         break;
 203                 case PAC_OPAQUE_TYPE_LIFETIME:
 204                         if (pos[1] != 4) {
 205                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 206                                            "PAC-Key lifetime length %d",
 207                                            pos[1]);
 208                                 os_free(buf);
 209                                 return -1;
 210                         }
 211                         lifetime = WPA_GET_BE32(pos + 2);
 212                         break;
 213                 case PAC_OPAQUE_TYPE_IDENTITY:
 214                         identity = pos + 2;
 215                         identity_len = pos[1];
 216                         break;
 217                 }
 218
 219                 pos += 2 + pos[1];
 220         }
 221
 222         if (pac_key == NULL) {
 223                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
 224                            "PAC-Opaque");
 225                 os_free(buf);
 226                 return -1;
 227         }
 228
 229         if (identity) {
 230                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
 231                                   "PAC-Opaque", identity, identity_len);
 232                 os_free(data->identity);
 233                 data->identity = os_malloc(identity_len);
 234                 if (data->identity) {
 235                         os_memcpy(data->identity, identity, identity_len);
 236                         data->identity_len = identity_len;
 237                 }
 238         }
 239
 240         if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
 241                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
 242                            "(lifetime=%ld now=%ld)", lifetime, now.sec);
 243                 data->send_new_pac = 2;
 244                 /*
 245                  * Allow PAC to be used to allow a PAC update with some level
 246                  * of server authentication (i.e., do not fall back to full TLS
 247                  * handshake since we cannot be sure that the peer would be
 248                  * able to validate server certificate now). However, reject
 249                  * the authentication since the PAC was not valid anymore. Peer
 250                  * can connect again with the newly provisioned PAC after this.
 251                  */
 252         } else if (lifetime - now.sec < data->pac_key_refresh_time) {
 253                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
 254                            "an update if authentication succeeds");
 255                 data->send_new_pac = 1;
 256         }
 257
 258         eap_fast_derive_master_secret(pac_key, server_random, client_random,
 259                                       master_secret);
 260
 261         os_free(buf);
 262
 263         return 1;
 264 }
 265
 266
 267 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 268                                      struct eap_fast_data *data)
 269 {
 270         u8 *sks;
 271
 272         /* RFC 4851, Section 5.1:
 273          * Extra key material after TLS key_block: session_key_seed[40]
 274          */
 275
 276         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 277                                   EAP_FAST_SKS_LEN);
 278         if (sks == NULL) {
 279                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 280                            "session_key_seed");
 281                 return;
 282         }
 283
 284         /*
 285          * RFC 4851, Section 5.2:
 286          * S-IMCK[0] = session_key_seed
 287          */
 288         wpa_hexdump_key(MSG_DEBUG,
 289                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 290                         sks, EAP_FAST_SKS_LEN);
 291         data->simck_idx = 0;
 292         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 293         os_free(sks);
 294 }
 295
 296
 297 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 298                                              struct eap_fast_data *data)
 299 {
 300         os_free(data->key_block_p);
 301         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 302                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 303                                     "key expansion",
 304                                     sizeof(*data->key_block_p));
 305         if (data->key_block_p == NULL) {
 306                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 307                 return;
 308         }
 309         /*
 310          * RFC 4851, Section 5.2:
 311          * S-IMCK[0] = session_key_seed
 312          */
 313         wpa_hexdump_key(MSG_DEBUG,
 314                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 315                         data->key_block_p->session_key_seed,
 316                         sizeof(data->key_block_p->session_key_seed));
 317         data->simck_idx = 0;
 318         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 319                   EAP_FAST_SIMCK_LEN);
 320         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 321                         data->key_block_p->server_challenge,
 322                         sizeof(data->key_block_p->server_challenge));
 323         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 324                         data->key_block_p->client_challenge,
 325                         sizeof(data->key_block_p->client_challenge));
 326 }
 327
 328
 329 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 330                                    struct eap_fast_data *data,
 331                                    u8 *isk, size_t isk_len)
 332 {
 333         u8 *key;
 334         size_t key_len;
 335
 336         os_memset(isk, 0, isk_len);
 337
 338         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 339                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 340                            "available");
 341                 return -1;
 342         }
 343
 344         if (data->phase2_method->getKey == NULL)
 345                 return 0;
 346
 347         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 348                                                &key_len)) == NULL) {
 349                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 350                            "from Phase 2");
 351                 return -1;
 352         }
 353
 354         if (key_len > isk_len)
 355                 key_len = isk_len;
 356         if (key_len == 32 &&
 357             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 358             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 359                 /*
 360                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 361                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 362                  * ISK for EAP-FAST cryptobinding.
 363                  */
 364                 os_memcpy(isk, key + 16, 16);
 365                 os_memcpy(isk + 16, key, 16);
 366         } else
 367                 os_memcpy(isk, key, key_len);
 368         os_free(key);
 369
 370         return 0;
 371 }
 372
 373
 374 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 375 {
 376         u8 isk[32], imck[60];
 377
 378         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 379                    data->simck_idx + 1);
 380
 381         /*
 382          * RFC 4851, Section 5.2:
 383          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 384          *                 MSK[j], 60)
 385          * S-IMCK[j] = first 40 octets of IMCK[j]
 386          * CMK[j] = last 20 octets of IMCK[j]
 387          */
 388
 389         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 390                 return -1;
 391         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 392         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 393                    "Inner Methods Compound Keys",
 394                    isk, sizeof(isk), imck, sizeof(imck));
 395         data->simck_idx++;
 396         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 397         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 398                         data->simck, EAP_FAST_SIMCK_LEN);
 399         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 400         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 401                         data->cmk, EAP_FAST_CMK_LEN);
 402
 403         return 0;
 404 }
 405
 406
 407 static void * eap_fast_init(struct eap_sm *sm)
 408 {
 409         struct eap_fast_data *data;
 410         u8 ciphers[5] = {
 411                 TLS_CIPHER_ANON_DH_AES128_SHA,
 412                 TLS_CIPHER_AES128_SHA,
 413                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 414                 TLS_CIPHER_RC4_SHA,
 415                 TLS_CIPHER_NONE
 416         };
 417
 418         data = os_zalloc(sizeof(*data));
 419         if (data == NULL)
 420                 return NULL;
 421         data->fast_version = EAP_FAST_VERSION;
 422         data->force_version = -1;
 423         if (sm->user && sm->user->force_version >= 0) {
 424                 data->force_version = sm->user->force_version;
 425                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 426                            data->force_version);
 427                 data->fast_version = data->force_version;
 428         }
 429         data->state = START;
 430
 431         if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
 432                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 433                 eap_fast_reset(sm, data);
 434                 return NULL;
 435         }
 436
 437         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 438                                            ciphers) < 0) {
 439                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 440                            "suites");
 441                 eap_fast_reset(sm, data);
 442                 return NULL;
 443         }
 444
 445         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 446                                                  eap_fast_session_ticket_cb,
 447                                                  data) < 0) {
 448                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 449                            "callback");
 450                 eap_fast_reset(sm, data);
 451                 return NULL;
 452         }
 453
 454         if (sm->pac_opaque_encr_key == NULL) {
 455                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 456                            "configured");
 457                 eap_fast_reset(sm, data);
 458                 return NULL;
 459         }
 460         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 461                   sizeof(data->pac_opaque_encr));
 462
 463         if (sm->eap_fast_a_id == NULL) {
 464                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 465                 eap_fast_reset(sm, data);
 466                 return NULL;
 467         }
 468         data->srv_id = os_malloc(sm->eap_fast_a_id_len);
 469         if (data->srv_id == NULL) {
 470                 eap_fast_reset(sm, data);
 471                 return NULL;
 472         }
 473         os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
 474         data->srv_id_len = sm->eap_fast_a_id_len;
 475
 476         if (sm->eap_fast_a_id_info == NULL) {
 477                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
 478                 eap_fast_reset(sm, data);
 479                 return NULL;
 480         }
 481         data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
 482         if (data->srv_id_info == NULL) {
 483                 eap_fast_reset(sm, data);
 484                 return NULL;
 485         }
 486
 487         /* PAC-Key lifetime in seconds (hard limit) */
 488         data->pac_key_lifetime = sm->pac_key_lifetime;
 489
 490         /*
 491          * PAC-Key refresh time in seconds (soft limit on remaining hard
 492          * limit). The server will generate a new PAC-Key when this number of
 493          * seconds (or fewer) of the lifetime remains.
 494          */
 495         data->pac_key_refresh_time = sm->pac_key_refresh_time;
 496
 497         return data;
 498 }
 499
 500
 501 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 502 {
 503         struct eap_fast_data *data = priv;
 504         if (data == NULL)
 505                 return;
 506         if (data->phase2_priv && data->phase2_method)
 507                 data->phase2_method->reset(sm, data->phase2_priv);
 508         eap_server_tls_ssl_deinit(sm, &data->ssl);
 509         os_free(data->srv_id);
 510         os_free(data->srv_id_info);
 511         os_free(data->key_block_p);
 512         wpabuf_free(data->pending_phase2_resp);
 513         os_free(data->identity);
 514         os_free(data);
 515 }
 516
 517
 518 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
 519                                             struct eap_fast_data *data, u8 id)
 520 {
 521         struct wpabuf *req;
 522
 523         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 524                             1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
 525                             EAP_CODE_REQUEST, id);
 526         if (req == NULL) {
 527                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 528                            " request");
 529                 eap_fast_state(data, FAILURE);
 530                 return NULL;
 531         }
 532
 533         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 534
 535         /* RFC 4851, 4.1.1. Authority ID Data */
 536         eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 537
 538         eap_fast_state(data, PHASE1);
 539
 540         return req;
 541 }
 542
 543
 544 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 545 {
 546         char cipher[64];
 547
 548         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 549
 550         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 551             < 0) {
 552                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 553                            "information");
 554                 eap_fast_state(data, FAILURE);
 555                 return -1;
 556         }
 557         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 558
 559         if (data->anon_provisioning) {
 560                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 561                 eap_fast_derive_key_provisioning(sm, data);
 562         } else
 563                 eap_fast_derive_key_auth(sm, data);
 564
 565         eap_fast_state(data, PHASE2_START);
 566
 567         return 0;
 568 }
 569
 570
 571 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 572                                                  struct eap_fast_data *data,
 573                                                  u8 id)
 574 {
 575         struct wpabuf *req;
 576
 577         if (data->phase2_priv == NULL) {
 578                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 579                            "initialized");
 580                 return NULL;
 581         }
 582         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 583         if (req == NULL)
 584                 return NULL;
 585
 586         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 587         return eap_fast_tlv_eap_payload(req);
 588 }
 589
 590
 591 static struct wpabuf * eap_fast_build_crypto_binding(
 592         struct eap_sm *sm, struct eap_fast_data *data)
 593 {
 594         struct wpabuf *buf;
 595         struct eap_tlv_result_tlv *result;
 596         struct eap_tlv_crypto_binding_tlv *binding;
 597
 598         buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
 599         if (buf == NULL)
 600                 return NULL;
 601
 602         if (data->send_new_pac || data->anon_provisioning ||
 603             data->phase2_method)
 604                 data->final_result = 0;
 605         else
 606                 data->final_result = 1;
 607
 608         if (!data->final_result || data->eap_seq > 1) {
 609                 /* Intermediate-Result */
 610                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
 611                            "(status=SUCCESS)");
 612                 result = wpabuf_put(buf, sizeof(*result));
 613                 result->tlv_type = host_to_be16(
 614                         EAP_TLV_TYPE_MANDATORY |
 615                         EAP_TLV_INTERMEDIATE_RESULT_TLV);
 616                 result->length = host_to_be16(2);
 617                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 618         }
 619
 620         if (data->final_result) {
 621                 /* Result TLV */
 622                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
 623                            "(status=SUCCESS)");
 624                 result = wpabuf_put(buf, sizeof(*result));
 625                 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 626                                                 EAP_TLV_RESULT_TLV);
 627                 result->length = host_to_be16(2);
 628                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 629         }
 630
 631         /* Crypto-Binding TLV */
 632         binding = wpabuf_put(buf, sizeof(*binding));
 633         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 634                                          EAP_TLV_CRYPTO_BINDING_TLV);
 635         binding->length = host_to_be16(sizeof(*binding) -
 636                                        sizeof(struct eap_tlv_hdr));
 637         binding->version = EAP_FAST_VERSION;
 638         binding->received_version = data->peer_version;
 639         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 640         if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
 641                 wpabuf_free(buf);
 642                 return NULL;
 643         }
 644
 645         /*
 646          * RFC 4851, Section 4.2.8:
 647          * The nonce in a request MUST have its least significant bit set to 0.
 648          */
 649         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 650
 651         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 652                   sizeof(binding->nonce));
 653
 654         /*
 655          * RFC 4851, Section 5.3:
 656          * CMK = CMK[j]
 657          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 658          */
 659
 660         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
 661                   (u8 *) binding, sizeof(*binding),
 662                   binding->compound_mac);
 663
 664         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 665                    "Received Version %d SubType %d",
 666                    binding->version, binding->received_version,
 667                    binding->subtype);
 668         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 669                     binding->nonce, sizeof(binding->nonce));
 670         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 671                     binding->compound_mac, sizeof(binding->compound_mac));
 672
 673         return buf;
 674 }
 675
 676
 677 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 678                                           struct eap_fast_data *data)
 679 {
 680         u8 pac_key[EAP_FAST_PAC_KEY_LEN];
 681         u8 *pac_buf, *pac_opaque;
 682         struct wpabuf *buf;
 683         u8 *pos;
 684         size_t buf_len, srv_id_info_len, pac_len;
 685         struct eap_tlv_hdr *pac_tlv;
 686         struct pac_tlv_hdr *pac_info;
 687         struct eap_tlv_result_tlv *result;
 688         struct os_time now;
 689
 690         if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
 691             os_get_time(&now) < 0)
 692                 return NULL;
 693         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 694                         pac_key, EAP_FAST_PAC_KEY_LEN);
 695
 696         pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
 697                 (2 + sm->identity_len) + 8;
 698         pac_buf = os_malloc(pac_len);
 699         if (pac_buf == NULL)
 700                 return NULL;
 701
 702         srv_id_info_len = os_strlen(data->srv_id_info);
 703
 704         pos = pac_buf;
 705         *pos++ = PAC_OPAQUE_TYPE_KEY;
 706         *pos++ = EAP_FAST_PAC_KEY_LEN;
 707         os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
 708         pos += EAP_FAST_PAC_KEY_LEN;
 709
 710         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 711         *pos++ = 4;
 712         WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
 713         pos += 4;
 714
 715         if (sm->identity) {
 716                 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
 717                 *pos++ = sm->identity_len;
 718                 os_memcpy(pos, sm->identity, sm->identity_len);
 719                 pos += sm->identity_len;
 720         }
 721
 722         pac_len = pos - pac_buf;
 723         while (pac_len % 8) {
 724                 *pos++ = PAC_OPAQUE_TYPE_PAD;
 725                 pac_len++;
 726         }
 727
 728         pac_opaque = os_malloc(pac_len + 8);
 729         if (pac_opaque == NULL) {
 730                 os_free(pac_buf);
 731                 return NULL;
 732         }
 733         if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
 734                      pac_opaque) < 0) {
 735                 os_free(pac_buf);
 736                 os_free(pac_opaque);
 737                 return NULL;
 738         }
 739         os_free(pac_buf);
 740
 741         pac_len += 8;
 742         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 743                     pac_opaque, pac_len);
 744
 745         buf_len = sizeof(*pac_tlv) +
 746                 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
 747                 sizeof(struct pac_tlv_hdr) + pac_len +
 748                 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
 749         buf = wpabuf_alloc(buf_len);
 750         if (buf == NULL) {
 751                 os_free(pac_opaque);
 752                 return NULL;
 753         }
 754
 755         /* Result TLV */
 756         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 757         result = wpabuf_put(buf, sizeof(*result));
 758         WPA_PUT_BE16((u8 *) &result->tlv_type,
 759                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 760         WPA_PUT_BE16((u8 *) &result->length, 2);
 761         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 762
 763         /* PAC TLV */
 764         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 765         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 766         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 767                                          EAP_TLV_PAC_TLV);
 768
 769         /* PAC-Key */
 770         eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
 771
 772         /* PAC-Opaque */
 773         eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
 774         os_free(pac_opaque);
 775
 776         /* PAC-Info */
 777         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 778         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 779
 780         /* PAC-Lifetime (inside PAC-Info) */
 781         eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
 782         wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
 783
 784         /* A-ID (inside PAC-Info) */
 785         eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 786
 787         /* Note: headers may be misaligned after A-ID */
 788
 789         if (sm->identity) {
 790                 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
 791                                  sm->identity_len);
 792         }
 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, plain);
 820         wpabuf_free(plain);
 821
 822         if (data->ssl.tls_out && piggyback) {
 823                 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
 824                            "(len=%d) with last Phase 1 Message (len=%d "
 825                            "used=%d)",
 826                            (int) wpabuf_len(encr),
 827                            (int) wpabuf_len(data->ssl.tls_out),
 828                            (int) data->ssl.tls_out_pos);
 829                 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
 830                         wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
 831                                    "output buffer");
 832                         wpabuf_free(encr);
 833                         return -1;
 834                 }
 835                 wpabuf_put_buf(data->ssl.tls_out, encr);
 836                 wpabuf_free(encr);
 837         } else {
 838                 wpabuf_free(data->ssl.tls_out);
 839                 data->ssl.tls_out_pos = 0;
 840                 data->ssl.tls_out = encr;
 841         }
 842
 843         return 0;
 844 }
 845
 846
 847 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 848 {
 849         struct eap_fast_data *data = priv;
 850         struct wpabuf *req = NULL;
 851         int piggyback = 0;
 852
 853         if (data->ssl.state == FRAG_ACK) {
 854                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 855                                                 data->fast_version);
 856         }
 857
 858         if (data->ssl.state == WAIT_FRAG_ACK) {
 859                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 860                                                 data->fast_version, id);
 861         }
 862
 863         switch (data->state) {
 864         case START:
 865                 return eap_fast_build_start(sm, data, id);
 866         case PHASE1:
 867                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 868                         if (eap_fast_phase1_done(sm, data) < 0)
 869                                 return NULL;
 870                         if (data->state == PHASE2_START) {
 871                                 /*
 872                                  * Try to generate Phase 2 data to piggyback
 873                                  * with the end of Phase 1 to avoid extra
 874                                  * roundtrip.
 875                                  */
 876                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
 877                                            "Phase 2");
 878                                 if (eap_fast_process_phase2_start(sm, data))
 879                                         break;
 880                                 req = eap_fast_build_phase2_req(sm, data, id);
 881                                 piggyback = 1;
 882                         }
 883                 }
 884                 break;
 885         case PHASE2_ID:
 886         case PHASE2_METHOD:
 887                 req = eap_fast_build_phase2_req(sm, data, id);
 888                 break;
 889         case CRYPTO_BINDING:
 890                 req = eap_fast_build_crypto_binding(sm, data);
 891                 if (data->phase2_method) {
 892                         /*
 893                          * Include the start of the next EAP method in the
 894                          * sequence in the same message with Crypto-Binding to
 895                          * save a round-trip.
 896                          */
 897                         struct wpabuf *eap;
 898                         eap = eap_fast_build_phase2_req(sm, data, id);
 899                         req = wpabuf_concat(req, eap);
 900                         eap_fast_state(data, PHASE2_METHOD);
 901                 }
 902                 break;
 903         case REQUEST_PAC:
 904                 req = eap_fast_build_pac(sm, data);
 905                 break;
 906         default:
 907                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 908                            __func__, data->state);
 909                 return NULL;
 910         }
 911
 912         if (req &&
 913             eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
 914                 return NULL;
 915
 916         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 917                                         data->fast_version, id);
 918 }
 919
 920
 921 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 922                               struct wpabuf *respData)
 923 {
 924         const u8 *pos;
 925         size_t len;
 926
 927         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 928         if (pos == NULL || len < 1) {
 929                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 930                 return TRUE;
 931         }
 932
 933         return FALSE;
 934 }
 935
 936
 937 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 938                                 EapType eap_type)
 939 {
 940         if (data->phase2_priv && data->phase2_method) {
 941                 data->phase2_method->reset(sm, data->phase2_priv);
 942                 data->phase2_method = NULL;
 943                 data->phase2_priv = NULL;
 944         }
 945         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 946                                                         eap_type);
 947         if (!data->phase2_method)
 948                 return -1;
 949
 950         if (data->key_block_p) {
 951                 sm->auth_challenge = data->key_block_p->server_challenge;
 952                 sm->peer_challenge = data->key_block_p->client_challenge;
 953         }
 954         sm->init_phase2 = 1;
 955         data->phase2_priv = data->phase2_method->init(sm);
 956         sm->init_phase2 = 0;
 957         sm->auth_challenge = NULL;
 958         sm->peer_challenge = NULL;
 959
 960         return data->phase2_priv == NULL ? -1 : 0;
 961 }
 962
 963
 964 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 965                                              struct eap_fast_data *data,
 966                                              u8 *in_data, size_t in_len)
 967 {
 968         u8 next_type = EAP_TYPE_NONE;
 969         struct eap_hdr *hdr;
 970         u8 *pos;
 971         size_t left;
 972         struct wpabuf buf;
 973         const struct eap_method *m = data->phase2_method;
 974         void *priv = data->phase2_priv;
 975
 976         if (priv == NULL) {
 977                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 978                            "initialized?!", __func__);
 979                 return;
 980         }
 981
 982         hdr = (struct eap_hdr *) in_data;
 983         pos = (u8 *) (hdr + 1);
 984
 985         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 986                 left = in_len - sizeof(*hdr);
 987                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 988                             "allowed types", pos + 1, left - 1);
 989 #ifdef EAP_SERVER_TNC
 990                 if (m && m->vendor == EAP_VENDOR_IETF &&
 991                     m->method == EAP_TYPE_TNC) {
 992                         wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
 993                                    "TNC negotiation");
 994                         next_type = eap_fast_req_failure(sm, data);
 995                         eap_fast_phase2_init(sm, data, next_type);
 996                         return;
 997                 }
 998 #endif /* EAP_SERVER_TNC */
 999                 eap_sm_process_nak(sm, pos + 1, left - 1);
1000                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1001                     sm->user->methods[sm->user_eap_method_index].method !=
1002                     EAP_TYPE_NONE) {
1003                         next_type = sm->user->methods[
1004                                 sm->user_eap_method_index++].method;
1005                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1006                                    next_type);
1007                 } else {
1008                         next_type = eap_fast_req_failure(sm, data);
1009                 }
1010                 eap_fast_phase2_init(sm, data, next_type);
1011                 return;
1012         }
1013
1014         wpabuf_set(&buf, in_data, in_len);
1015
1016         if (m->check(sm, priv, &buf)) {
1017                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1018                            "ignore the packet");
1019                 next_type = eap_fast_req_failure(sm, data);
1020                 return;
1021         }
1022
1023         m->process(sm, priv, &buf);
1024
1025         if (!m->isDone(sm, priv))
1026                 return;
1027
1028         if (!m->isSuccess(sm, priv)) {
1029                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1030                 next_type = eap_fast_req_failure(sm, data);
1031                 eap_fast_phase2_init(sm, data, next_type);
1032                 return;
1033         }
1034
1035         switch (data->state) {
1036         case PHASE2_ID:
1037                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1038                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1039                                           "Identity not found in the user "
1040                                           "database",
1041                                           sm->identity, sm->identity_len);
1042                         next_type = eap_fast_req_failure(sm, data);
1043                         break;
1044                 }
1045
1046                 eap_fast_state(data, PHASE2_METHOD);
1047                 if (data->anon_provisioning) {
1048                         /*
1049                          * Only EAP-MSCHAPv2 is allowed for anonymous
1050                          * provisioning.
1051                          */
1052                         next_type = EAP_TYPE_MSCHAPV2;
1053                         sm->user_eap_method_index = 0;
1054                 } else {
1055                         next_type = sm->user->methods[0].method;
1056                         sm->user_eap_method_index = 1;
1057                 }
1058                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1059                 break;
1060         case PHASE2_METHOD:
1061         case CRYPTO_BINDING:
1062                 eap_fast_update_icmk(sm, data);
1063                 eap_fast_state(data, CRYPTO_BINDING);
1064                 data->eap_seq++;
1065                 next_type = EAP_TYPE_NONE;
1066 #ifdef EAP_SERVER_TNC
1067                 if (sm->tnc && !data->tnc_started) {
1068                         wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1069                         next_type = EAP_TYPE_TNC;
1070                         data->tnc_started = 1;
1071                 }
1072 #endif /* EAP_SERVER_TNC */
1073                 break;
1074         case FAILURE:
1075                 break;
1076         default:
1077                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1078                            __func__, data->state);
1079                 break;
1080         }
1081
1082         eap_fast_phase2_init(sm, data, next_type);
1083 }
1084
1085
1086 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1087                                         struct eap_fast_data *data,
1088                                         u8 *in_data, size_t in_len)
1089 {
1090         struct eap_hdr *hdr;
1091         size_t len;
1092
1093         hdr = (struct eap_hdr *) in_data;
1094         if (in_len < (int) sizeof(*hdr)) {
1095                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1096                            "EAP frame (len=%lu)", (unsigned long) in_len);
1097                 eap_fast_req_failure(sm, data);
1098                 return;
1099         }
1100         len = be_to_host16(hdr->length);
1101         if (len > in_len) {
1102                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1103                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1104                            (unsigned long) in_len, (unsigned long) len);
1105                 eap_fast_req_failure(sm, data);
1106                 return;
1107         }
1108         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1109                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1110                    (unsigned long) len);
1111         switch (hdr->code) {
1112         case EAP_CODE_RESPONSE:
1113                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1114                 break;
1115         default:
1116                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1117                            "Phase 2 EAP header", hdr->code);
1118                 break;
1119         }
1120 }
1121
1122
1123 static int eap_fast_parse_tlvs(struct wpabuf *data,
1124                                struct eap_fast_tlv_parse *tlv)
1125 {
1126         int mandatory, tlv_type, res;
1127         size_t len;
1128         u8 *pos, *end;
1129
1130         os_memset(tlv, 0, sizeof(*tlv));
1131
1132         pos = wpabuf_mhead(data);
1133         end = pos + wpabuf_len(data);
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 (len > (size_t) (end - pos)) {
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 %u%s",
1146                            tlv_type, (unsigned int) len,
1147                            mandatory ? " (mandatory)" : "");
1148
1149                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1150                 if (res == -2)
1151                         break;
1152                 if (res < 0) {
1153                         if (mandatory) {
1154                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1155                                            "mandatory TLV type %d", tlv_type);
1156                                 /* TODO: generate Nak TLV */
1157                                 break;
1158                         } else {
1159                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1160                                            "unknown optional TLV type %d",
1161                                            tlv_type);
1162                         }
1163                 }
1164
1165                 pos += len;
1166         }
1167
1168         return 0;
1169 }
1170
1171
1172 static int eap_fast_validate_crypto_binding(
1173         struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1174         size_t bind_len)
1175 {
1176         u8 cmac[SHA1_MAC_LEN];
1177
1178         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1179                    "Version %d Received Version %d SubType %d",
1180                    b->version, b->received_version, b->subtype);
1181         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1182                     b->nonce, sizeof(b->nonce));
1183         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1184                     b->compound_mac, sizeof(b->compound_mac));
1185
1186         if (b->version != EAP_FAST_VERSION ||
1187             b->received_version != EAP_FAST_VERSION) {
1188                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1189                            "in Crypto-Binding: version %d "
1190                            "received_version %d", b->version,
1191                            b->received_version);
1192                 return -1;
1193         }
1194
1195         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1196                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1197                            "Crypto-Binding: %d", b->subtype);
1198                 return -1;
1199         }
1200
1201         if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1202             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1203                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1204                            "Crypto-Binding");
1205                 return -1;
1206         }
1207
1208         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1209         os_memset(b->compound_mac, 0, sizeof(cmac));
1210         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1211                     "Compound MAC calculation",
1212                     (u8 *) b, bind_len);
1213         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1214                   b->compound_mac);
1215         if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1216                 wpa_hexdump(MSG_MSGDUMP,
1217                             "EAP-FAST: Calculated Compound MAC",
1218                             b->compound_mac, sizeof(cmac));
1219                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1220                            "match");
1221                 return -1;
1222         }
1223
1224         return 0;
1225 }
1226
1227
1228 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1229 {
1230         struct eap_tlv_pac_type_tlv *tlv;
1231
1232         if (pac == NULL || len != sizeof(*tlv))
1233                 return 0;
1234
1235         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1236
1237         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1238                 be_to_host16(tlv->length) == 2 &&
1239                 be_to_host16(tlv->pac_type) == type;
1240 }
1241
1242
1243 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1244                                          struct eap_fast_data *data,
1245                                          struct wpabuf *in_data)
1246 {
1247         struct eap_fast_tlv_parse tlv;
1248         int check_crypto_binding = data->state == CRYPTO_BINDING;
1249
1250         if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1251                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1252                            "Phase 2 TLVs");
1253                 return;
1254         }
1255
1256         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1257                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1258                            "failure");
1259                 eap_fast_state(data, FAILURE);
1260                 return;
1261         }
1262
1263         if (data->state == REQUEST_PAC) {
1264                 u16 type, len, res;
1265                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1266                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1267                                    "Acknowledgement received");
1268                         eap_fast_state(data, FAILURE);
1269                         return;
1270                 }
1271
1272                 type = WPA_GET_BE16(tlv.pac);
1273                 len = WPA_GET_BE16(tlv.pac + 2);
1274                 res = WPA_GET_BE16(tlv.pac + 4);
1275
1276                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1277                     res != EAP_TLV_RESULT_SUCCESS) {
1278                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1279                                    "contain acknowledgement");
1280                         eap_fast_state(data, FAILURE);
1281                         return;
1282                 }
1283
1284                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1285                            "- PAC provisioning succeeded");
1286                 eap_fast_state(data, (data->anon_provisioning ||
1287                                       data->send_new_pac == 2) ?
1288                                FAILURE : SUCCESS);
1289                 return;
1290         }
1291
1292         if (check_crypto_binding) {
1293                 if (tlv.crypto_binding == NULL) {
1294                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1295                                    "TLV received");
1296                         eap_fast_state(data, FAILURE);
1297                         return;
1298                 }
1299
1300                 if (data->final_result &&
1301                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1302                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1303                                    "without Success Result");
1304                         eap_fast_state(data, FAILURE);
1305                         return;
1306                 }
1307
1308                 if (!data->final_result &&
1309                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1310                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1311                                    "without intermediate Success Result");
1312                         eap_fast_state(data, FAILURE);
1313                         return;
1314                 }
1315
1316                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1317                                                      tlv.crypto_binding_len)) {
1318                         eap_fast_state(data, FAILURE);
1319                         return;
1320                 }
1321
1322                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1323                            "received");
1324                 if (data->final_result) {
1325                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1326                                    "completed successfully");
1327                 }
1328
1329                 if (data->anon_provisioning &&
1330                     sm->eap_fast_prov != ANON_PROV &&
1331                     sm->eap_fast_prov != BOTH_PROV) {
1332                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1333                                    "use unauthenticated provisioning which is "
1334                                    "disabled");
1335                         eap_fast_state(data, FAILURE);
1336                         return;
1337                 }
1338
1339                 if (sm->eap_fast_prov != AUTH_PROV &&
1340                     sm->eap_fast_prov != BOTH_PROV &&
1341                     tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1342                     eap_fast_pac_type(tlv.pac, tlv.pac_len,
1343                                       PAC_TYPE_TUNNEL_PAC)) {
1344                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1345                                    "use authenticated provisioning which is "
1346                                    "disabled");
1347                         eap_fast_state(data, FAILURE);
1348                         return;
1349                 }
1350
1351                 if (data->anon_provisioning ||
1352                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1353                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1354                                        PAC_TYPE_TUNNEL_PAC))) {
1355                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1356                                    "Tunnel PAC");
1357                         eap_fast_state(data, REQUEST_PAC);
1358                 } else if (data->send_new_pac) {
1359                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1360                                    "re-keying of Tunnel PAC");
1361                         eap_fast_state(data, REQUEST_PAC);
1362                 } else if (data->final_result)
1363                         eap_fast_state(data, SUCCESS);
1364         }
1365
1366         if (tlv.eap_payload_tlv) {
1367                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1368                                             tlv.eap_payload_tlv_len);
1369         }
1370 }
1371
1372
1373 static void eap_fast_process_phase2(struct eap_sm *sm,
1374                                     struct eap_fast_data *data,
1375                                     struct wpabuf *in_buf)
1376 {
1377         struct wpabuf *in_decrypted;
1378
1379         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1380                    " Phase 2", (unsigned long) wpabuf_len(in_buf));
1381
1382         if (data->pending_phase2_resp) {
1383                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1384                            "skip decryption and use old data");
1385                 eap_fast_process_phase2_tlvs(sm, data,
1386                                              data->pending_phase2_resp);
1387                 wpabuf_free(data->pending_phase2_resp);
1388                 data->pending_phase2_resp = NULL;
1389                 return;
1390         }
1391
1392         in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1393                                               in_buf);
1394         if (in_decrypted == NULL) {
1395                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1396                            "data");
1397                 eap_fast_state(data, FAILURE);
1398                 return;
1399         }
1400
1401         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1402                             in_decrypted);
1403
1404         eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1405
1406         if (sm->method_pending == METHOD_PENDING_WAIT) {
1407                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1408                            "pending wait state - save decrypted response");
1409                 wpabuf_free(data->pending_phase2_resp);
1410                 data->pending_phase2_resp = in_decrypted;
1411                 return;
1412         }
1413
1414         wpabuf_free(in_decrypted);
1415 }
1416
1417
1418 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1419                                     int peer_version)
1420 {
1421         struct eap_fast_data *data = priv;
1422
1423         data->peer_version = peer_version;
1424
1425         if (data->force_version >= 0 && peer_version != data->force_version) {
1426                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1427                            " version (forced=%d peer=%d) - reject",
1428                            data->force_version, peer_version);
1429                 return -1;
1430         }
1431
1432         if (peer_version < data->fast_version) {
1433                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1434                            "use version %d",
1435                            peer_version, data->fast_version, peer_version);
1436                 data->fast_version = peer_version;
1437         }
1438
1439         return 0;
1440 }
1441
1442
1443 static int eap_fast_process_phase1(struct eap_sm *sm,
1444                                    struct eap_fast_data *data)
1445 {
1446         if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1447                 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1448                 eap_fast_state(data, FAILURE);
1449                 return -1;
1450         }
1451
1452         if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1453             wpabuf_len(data->ssl.tls_out) > 0)
1454                 return 1;
1455
1456         /*
1457          * Phase 1 was completed with the received message (e.g., when using
1458          * abbreviated handshake), so Phase 2 can be started immediately
1459          * without having to send through an empty message to the peer.
1460          */
1461
1462         return eap_fast_phase1_done(sm, data);
1463 }
1464
1465
1466 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1467                                          struct eap_fast_data *data)
1468 {
1469         u8 next_type;
1470
1471         if (data->identity) {
1472                 os_free(sm->identity);
1473                 sm->identity = data->identity;
1474                 data->identity = NULL;
1475                 sm->identity_len = data->identity_len;
1476                 data->identity_len = 0;
1477                 sm->require_identity_match = 1;
1478                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1479                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1480                                           "Phase2 Identity not found "
1481                                           "in the user database",
1482                                           sm->identity, sm->identity_len);
1483                         next_type = eap_fast_req_failure(sm, data);
1484                 } else {
1485                         wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1486                                    "known - skip Phase 2 Identity Request");
1487                         next_type = sm->user->methods[0].method;
1488                         sm->user_eap_method_index = 1;
1489                 }
1490
1491                 eap_fast_state(data, PHASE2_METHOD);
1492         } else {
1493                 eap_fast_state(data, PHASE2_ID);
1494                 next_type = EAP_TYPE_IDENTITY;
1495         }
1496
1497         return eap_fast_phase2_init(sm, data, next_type);
1498 }
1499
1500
1501 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1502                                  const struct wpabuf *respData)
1503 {
1504         struct eap_fast_data *data = priv;
1505
1506         switch (data->state) {
1507         case PHASE1:
1508                 if (eap_fast_process_phase1(sm, data))
1509                         break;
1510
1511                 /* fall through to PHASE2_START */
1512         case PHASE2_START:
1513                 eap_fast_process_phase2_start(sm, data);
1514                 break;
1515         case PHASE2_ID:
1516         case PHASE2_METHOD:
1517         case CRYPTO_BINDING:
1518         case REQUEST_PAC:
1519                 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1520                 break;
1521         default:
1522                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1523                            data->state, __func__);
1524                 break;
1525         }
1526 }
1527
1528
1529 static void eap_fast_process(struct eap_sm *sm, void *priv,
1530                              struct wpabuf *respData)
1531 {
1532         struct eap_fast_data *data = priv;
1533         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1534                                    EAP_TYPE_FAST, eap_fast_process_version,
1535                                    eap_fast_process_msg) < 0)
1536                 eap_fast_state(data, FAILURE);
1537 }
1538
1539
1540 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1541 {
1542         struct eap_fast_data *data = priv;
1543         return data->state == SUCCESS || data->state == FAILURE;
1544 }
1545
1546
1547 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1548 {
1549         struct eap_fast_data *data = priv;
1550         u8 *eapKeyData;
1551
1552         if (data->state != SUCCESS)
1553                 return NULL;
1554
1555         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1556         if (eapKeyData == NULL)
1557                 return NULL;
1558
1559         eap_fast_derive_eap_msk(data->simck, eapKeyData);
1560         *len = EAP_FAST_KEY_LEN;
1561
1562         return eapKeyData;
1563 }
1564
1565
1566 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1567 {
1568         struct eap_fast_data *data = priv;
1569         u8 *eapKeyData;
1570
1571         if (data->state != SUCCESS)
1572                 return NULL;
1573
1574         eapKeyData = os_malloc(EAP_EMSK_LEN);
1575         if (eapKeyData == NULL)
1576                 return NULL;
1577
1578         eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1579         *len = EAP_EMSK_LEN;
1580
1581         return eapKeyData;
1582 }
1583
1584
1585 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1586 {
1587         struct eap_fast_data *data = priv;
1588         return data->state == SUCCESS;
1589 }
1590
1591
1592 int eap_server_fast_register(void)
1593 {
1594         struct eap_method *eap;
1595         int ret;
1596
1597         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1598                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1599         if (eap == NULL)
1600                 return -1;
1601
1602         eap->init = eap_fast_init;
1603         eap->reset = eap_fast_reset;
1604         eap->buildReq = eap_fast_buildReq;
1605         eap->check = eap_fast_check;
1606         eap->process = eap_fast_process;
1607         eap->isDone = eap_fast_isDone;
1608         eap->getKey = eap_fast_getKey;
1609         eap->get_emsk = eap_fast_get_emsk;
1610         eap->isSuccess = eap_fast_isSuccess;
1611
1612         ret = eap_server_method_register(eap);
1613         if (ret)
1614                 eap_server_method_free(eap);
1615         return ret;
1616 }