libeap/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, sizeof(data->pac_opaque_encr),
 165                        (pac_opaque_len - 8) / 8, 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 (end - pos > 1) {
 184                 u8 id, elen;
 185
 186                 id = *pos++;
 187                 elen = *pos++;
 188                 if (elen > end - pos)
 189                         break;
 190
 191                 switch (id) {
 192                 case PAC_OPAQUE_TYPE_PAD:
 193                         goto done;
 194                 case PAC_OPAQUE_TYPE_KEY:
 195                         if (elen != EAP_FAST_PAC_KEY_LEN) {
 196                                 wpa_printf(MSG_DEBUG,
 197                                            "EAP-FAST: Invalid PAC-Key length %d",
 198                                            elen);
 199                                 os_free(buf);
 200                                 return -1;
 201                         }
 202                         pac_key = pos;
 203                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 204                                         "decrypted PAC-Opaque",
 205                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 206                         break;
 207                 case PAC_OPAQUE_TYPE_LIFETIME:
 208                         if (elen != 4) {
 209                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 210                                            "PAC-Key lifetime length %d",
 211                                            elen);
 212                                 os_free(buf);
 213                                 return -1;
 214                         }
 215                         lifetime = WPA_GET_BE32(pos);
 216                         break;
 217                 case PAC_OPAQUE_TYPE_IDENTITY:
 218                         identity = pos;
 219                         identity_len = elen;
 220                         break;
 221                 }
 222
 223                 pos += elen;
 224         }
 225 done:
 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,
 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                                     sizeof(*data->key_block_p));
 309         if (data->key_block_p == NULL) {
 310                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 311                 return;
 312         }
 313         /*
 314          * RFC 4851, Section 5.2:
 315          * S-IMCK[0] = session_key_seed
 316          */
 317         wpa_hexdump_key(MSG_DEBUG,
 318                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 319                         data->key_block_p->session_key_seed,
 320                         sizeof(data->key_block_p->session_key_seed));
 321         data->simck_idx = 0;
 322         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 323                   EAP_FAST_SIMCK_LEN);
 324         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 325                         data->key_block_p->server_challenge,
 326                         sizeof(data->key_block_p->server_challenge));
 327         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 328                         data->key_block_p->client_challenge,
 329                         sizeof(data->key_block_p->client_challenge));
 330 }
 331
 332
 333 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 334                                    struct eap_fast_data *data,
 335                                    u8 *isk, size_t isk_len)
 336 {
 337         u8 *key;
 338         size_t key_len;
 339
 340         os_memset(isk, 0, isk_len);
 341
 342         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 343                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 344                            "available");
 345                 return -1;
 346         }
 347
 348         if (data->phase2_method->getKey == NULL)
 349                 return 0;
 350
 351         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 352                                                &key_len)) == NULL) {
 353                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 354                            "from Phase 2");
 355                 return -1;
 356         }
 357
 358         if (key_len > isk_len)
 359                 key_len = isk_len;
 360         if (key_len == 32 &&
 361             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 362             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 363                 /*
 364                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 365                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 366                  * ISK for EAP-FAST cryptobinding.
 367                  */
 368                 os_memcpy(isk, key + 16, 16);
 369                 os_memcpy(isk + 16, key, 16);
 370         } else
 371                 os_memcpy(isk, key, key_len);
 372         os_free(key);
 373
 374         return 0;
 375 }
 376
 377
 378 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 379 {
 380         u8 isk[32], imck[60];
 381
 382         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 383                    data->simck_idx + 1);
 384
 385         /*
 386          * RFC 4851, Section 5.2:
 387          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 388          *                 MSK[j], 60)
 389          * S-IMCK[j] = first 40 octets of IMCK[j]
 390          * CMK[j] = last 20 octets of IMCK[j]
 391          */
 392
 393         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 394                 return -1;
 395         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 396         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 397                    "Inner Methods Compound Keys",
 398                    isk, sizeof(isk), imck, sizeof(imck));
 399         data->simck_idx++;
 400         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 401         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 402                         data->simck, EAP_FAST_SIMCK_LEN);
 403         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 404         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 405                         data->cmk, EAP_FAST_CMK_LEN);
 406
 407         return 0;
 408 }
 409
 410
 411 static void * eap_fast_init(struct eap_sm *sm)
 412 {
 413         struct eap_fast_data *data;
 414         u8 ciphers[7] = {
 415                 TLS_CIPHER_ANON_DH_AES128_SHA,
 416                 TLS_CIPHER_AES128_SHA,
 417                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 418                 TLS_CIPHER_RC4_SHA,
 419                 TLS_CIPHER_RSA_DHE_AES256_SHA,
 420                 TLS_CIPHER_AES256_SHA,
 421                 TLS_CIPHER_NONE
 422         };
 423
 424         data = os_zalloc(sizeof(*data));
 425         if (data == NULL)
 426                 return NULL;
 427         data->fast_version = EAP_FAST_VERSION;
 428         data->force_version = -1;
 429         if (sm->user && sm->user->force_version >= 0) {
 430                 data->force_version = sm->user->force_version;
 431                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 432                            data->force_version);
 433                 data->fast_version = data->force_version;
 434         }
 435         data->state = START;
 436
 437         if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_FAST)) {
 438                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 439                 eap_fast_reset(sm, data);
 440                 return NULL;
 441         }
 442
 443         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 444                                            ciphers) < 0) {
 445                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 446                            "suites");
 447                 eap_fast_reset(sm, data);
 448                 return NULL;
 449         }
 450
 451         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 452                                                  eap_fast_session_ticket_cb,
 453                                                  data) < 0) {
 454                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 455                            "callback");
 456                 eap_fast_reset(sm, data);
 457                 return NULL;
 458         }
 459
 460         if (sm->pac_opaque_encr_key == NULL) {
 461                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 462                            "configured");
 463                 eap_fast_reset(sm, data);
 464                 return NULL;
 465         }
 466         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 467                   sizeof(data->pac_opaque_encr));
 468
 469         if (sm->eap_fast_a_id == NULL) {
 470                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 471                 eap_fast_reset(sm, data);
 472                 return NULL;
 473         }
 474         data->srv_id = os_malloc(sm->eap_fast_a_id_len);
 475         if (data->srv_id == NULL) {
 476                 eap_fast_reset(sm, data);
 477                 return NULL;
 478         }
 479         os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
 480         data->srv_id_len = sm->eap_fast_a_id_len;
 481
 482         if (sm->eap_fast_a_id_info == NULL) {
 483                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
 484                 eap_fast_reset(sm, data);
 485                 return NULL;
 486         }
 487         data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
 488         if (data->srv_id_info == NULL) {
 489                 eap_fast_reset(sm, data);
 490                 return NULL;
 491         }
 492
 493         /* PAC-Key lifetime in seconds (hard limit) */
 494         data->pac_key_lifetime = sm->pac_key_lifetime;
 495
 496         /*
 497          * PAC-Key refresh time in seconds (soft limit on remaining hard
 498          * limit). The server will generate a new PAC-Key when this number of
 499          * seconds (or fewer) of the lifetime remains.
 500          */
 501         data->pac_key_refresh_time = sm->pac_key_refresh_time;
 502
 503         return data;
 504 }
 505
 506
 507 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 508 {
 509         struct eap_fast_data *data = priv;
 510         if (data == NULL)
 511                 return;
 512         if (data->phase2_priv && data->phase2_method)
 513                 data->phase2_method->reset(sm, data->phase2_priv);
 514         eap_server_tls_ssl_deinit(sm, &data->ssl);
 515         os_free(data->srv_id);
 516         os_free(data->srv_id_info);
 517         os_free(data->key_block_p);
 518         wpabuf_free(data->pending_phase2_resp);
 519         os_free(data->identity);
 520         bin_clear_free(data, sizeof(*data));
 521 }
 522
 523
 524 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
 525                                             struct eap_fast_data *data, u8 id)
 526 {
 527         struct wpabuf *req;
 528
 529         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 530                             1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
 531                             EAP_CODE_REQUEST, id);
 532         if (req == NULL) {
 533                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 534                            " request");
 535                 eap_fast_state(data, FAILURE);
 536                 return NULL;
 537         }
 538
 539         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 540
 541         /* RFC 4851, 4.1.1. Authority ID Data */
 542         eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 543
 544         eap_fast_state(data, PHASE1);
 545
 546         return req;
 547 }
 548
 549
 550 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 551 {
 552         char cipher[64];
 553
 554         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 555
 556         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 557             < 0) {
 558                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 559                            "information");
 560                 eap_fast_state(data, FAILURE);
 561                 return -1;
 562         }
 563         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 564
 565         if (data->anon_provisioning) {
 566                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 567                 eap_fast_derive_key_provisioning(sm, data);
 568         } else
 569                 eap_fast_derive_key_auth(sm, data);
 570
 571         eap_fast_state(data, PHASE2_START);
 572
 573         return 0;
 574 }
 575
 576
 577 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 578                                                  struct eap_fast_data *data,
 579                                                  u8 id)
 580 {
 581         struct wpabuf *req;
 582
 583         if (data->phase2_priv == NULL) {
 584                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 585                            "initialized");
 586                 return NULL;
 587         }
 588         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 589         if (req == NULL)
 590                 return NULL;
 591
 592         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 593         return eap_fast_tlv_eap_payload(req);
 594 }
 595
 596
 597 static struct wpabuf * eap_fast_build_crypto_binding(
 598         struct eap_sm *sm, struct eap_fast_data *data)
 599 {
 600         struct wpabuf *buf;
 601         struct eap_tlv_result_tlv *result;
 602         struct eap_tlv_crypto_binding_tlv *binding;
 603
 604         buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
 605         if (buf == NULL)
 606                 return NULL;
 607
 608         if (data->send_new_pac || data->anon_provisioning ||
 609             data->phase2_method)
 610                 data->final_result = 0;
 611         else
 612                 data->final_result = 1;
 613
 614         if (!data->final_result || data->eap_seq > 1) {
 615                 /* Intermediate-Result */
 616                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
 617                            "(status=SUCCESS)");
 618                 result = wpabuf_put(buf, sizeof(*result));
 619                 result->tlv_type = host_to_be16(
 620                         EAP_TLV_TYPE_MANDATORY |
 621                         EAP_TLV_INTERMEDIATE_RESULT_TLV);
 622                 result->length = host_to_be16(2);
 623                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 624         }
 625
 626         if (data->final_result) {
 627                 /* Result TLV */
 628                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
 629                            "(status=SUCCESS)");
 630                 result = wpabuf_put(buf, sizeof(*result));
 631                 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 632                                                 EAP_TLV_RESULT_TLV);
 633                 result->length = host_to_be16(2);
 634                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 635         }
 636
 637         /* Crypto-Binding TLV */
 638         binding = wpabuf_put(buf, sizeof(*binding));
 639         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 640                                          EAP_TLV_CRYPTO_BINDING_TLV);
 641         binding->length = host_to_be16(sizeof(*binding) -
 642                                        sizeof(struct eap_tlv_hdr));
 643         binding->version = EAP_FAST_VERSION;
 644         binding->received_version = data->peer_version;
 645         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 646         if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
 647                 wpabuf_free(buf);
 648                 return NULL;
 649         }
 650
 651         /*
 652          * RFC 4851, Section 4.2.8:
 653          * The nonce in a request MUST have its least significant bit set to 0.
 654          */
 655         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 656
 657         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 658                   sizeof(binding->nonce));
 659
 660         /*
 661          * RFC 4851, Section 5.3:
 662          * CMK = CMK[j]
 663          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 664          */
 665
 666         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
 667                   (u8 *) binding, sizeof(*binding),
 668                   binding->compound_mac);
 669
 670         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 671                    "Received Version %d SubType %d",
 672                    binding->version, binding->received_version,
 673                    binding->subtype);
 674         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 675                     binding->nonce, sizeof(binding->nonce));
 676         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 677                     binding->compound_mac, sizeof(binding->compound_mac));
 678
 679         return buf;
 680 }
 681
 682
 683 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 684                                           struct eap_fast_data *data)
 685 {
 686         u8 pac_key[EAP_FAST_PAC_KEY_LEN];
 687         u8 *pac_buf, *pac_opaque;
 688         struct wpabuf *buf;
 689         u8 *pos;
 690         size_t buf_len, srv_id_info_len, pac_len;
 691         struct eap_tlv_hdr *pac_tlv;
 692         struct pac_tlv_hdr *pac_info;
 693         struct eap_tlv_result_tlv *result;
 694         struct os_time now;
 695
 696         if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
 697             os_get_time(&now) < 0)
 698                 return NULL;
 699         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 700                         pac_key, EAP_FAST_PAC_KEY_LEN);
 701
 702         pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
 703                 (2 + sm->identity_len) + 8;
 704         pac_buf = os_malloc(pac_len);
 705         if (pac_buf == NULL)
 706                 return NULL;
 707
 708         srv_id_info_len = os_strlen(data->srv_id_info);
 709
 710         pos = pac_buf;
 711         *pos++ = PAC_OPAQUE_TYPE_KEY;
 712         *pos++ = EAP_FAST_PAC_KEY_LEN;
 713         os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
 714         pos += EAP_FAST_PAC_KEY_LEN;
 715
 716         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 717         *pos++ = 4;
 718         WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
 719         pos += 4;
 720
 721         if (sm->identity) {
 722                 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
 723                 *pos++ = sm->identity_len;
 724                 os_memcpy(pos, sm->identity, sm->identity_len);
 725                 pos += sm->identity_len;
 726         }
 727
 728         pac_len = pos - pac_buf;
 729         while (pac_len % 8) {
 730                 *pos++ = PAC_OPAQUE_TYPE_PAD;
 731                 pac_len++;
 732         }
 733
 734         pac_opaque = os_malloc(pac_len + 8);
 735         if (pac_opaque == NULL) {
 736                 os_free(pac_buf);
 737                 return NULL;
 738         }
 739         if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
 740                      pac_len / 8, pac_buf, pac_opaque) < 0) {
 741                 os_free(pac_buf);
 742                 os_free(pac_opaque);
 743                 return NULL;
 744         }
 745         os_free(pac_buf);
 746
 747         pac_len += 8;
 748         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 749                     pac_opaque, pac_len);
 750
 751         buf_len = sizeof(*pac_tlv) +
 752                 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
 753                 sizeof(struct pac_tlv_hdr) + pac_len +
 754                 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
 755         buf = wpabuf_alloc(buf_len);
 756         if (buf == NULL) {
 757                 os_free(pac_opaque);
 758                 return NULL;
 759         }
 760
 761         /* Result TLV */
 762         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 763         result = wpabuf_put(buf, sizeof(*result));
 764         WPA_PUT_BE16((u8 *) &result->tlv_type,
 765                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 766         WPA_PUT_BE16((u8 *) &result->length, 2);
 767         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 768
 769         /* PAC TLV */
 770         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 771         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 772         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 773                                          EAP_TLV_PAC_TLV);
 774
 775         /* PAC-Key */
 776         eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
 777
 778         /* PAC-Opaque */
 779         eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
 780         os_free(pac_opaque);
 781
 782         /* PAC-Info */
 783         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 784         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 785
 786         /* PAC-Lifetime (inside PAC-Info) */
 787         eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
 788         wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
 789
 790         /* A-ID (inside PAC-Info) */
 791         eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
 792
 793         /* Note: headers may be misaligned after A-ID */
 794
 795         if (sm->identity) {
 796                 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
 797                                  sm->identity_len);
 798         }
 799
 800         /* A-ID-Info (inside PAC-Info) */
 801         eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
 802                          srv_id_info_len);
 803
 804         /* PAC-Type (inside PAC-Info) */
 805         eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
 806         wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
 807
 808         /* Update PAC-Info and PAC TLV Length fields */
 809         pos = wpabuf_put(buf, 0);
 810         pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
 811         pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
 812
 813         return buf;
 814 }
 815
 816
 817 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
 818                                    struct eap_fast_data *data,
 819                                    struct wpabuf *plain, int piggyback)
 820 {
 821         struct wpabuf *encr;
 822
 823         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 824                             plain);
 825         encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
 826         wpabuf_free(plain);
 827
 828         if (!encr)
 829                 return -1;
 830
 831         if (data->ssl.tls_out && piggyback) {
 832                 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
 833                            "(len=%d) with last Phase 1 Message (len=%d "
 834                            "used=%d)",
 835                            (int) wpabuf_len(encr),
 836                            (int) wpabuf_len(data->ssl.tls_out),
 837                            (int) data->ssl.tls_out_pos);
 838                 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
 839                         wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
 840                                    "output buffer");
 841                         wpabuf_free(encr);
 842                         return -1;
 843                 }
 844                 wpabuf_put_buf(data->ssl.tls_out, encr);
 845                 wpabuf_free(encr);
 846         } else {
 847                 wpabuf_free(data->ssl.tls_out);
 848                 data->ssl.tls_out_pos = 0;
 849                 data->ssl.tls_out = encr;
 850         }
 851
 852         return 0;
 853 }
 854
 855
 856 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 857 {
 858         struct eap_fast_data *data = priv;
 859         struct wpabuf *req = NULL;
 860         int piggyback = 0;
 861
 862         if (data->ssl.state == FRAG_ACK) {
 863                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 864                                                 data->fast_version);
 865         }
 866
 867         if (data->ssl.state == WAIT_FRAG_ACK) {
 868                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 869                                                 data->fast_version, id);
 870         }
 871
 872         switch (data->state) {
 873         case START:
 874                 return eap_fast_build_start(sm, data, id);
 875         case PHASE1:
 876                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 877                         if (eap_fast_phase1_done(sm, data) < 0)
 878                                 return NULL;
 879                         if (data->state == PHASE2_START) {
 880                                 /*
 881                                  * Try to generate Phase 2 data to piggyback
 882                                  * with the end of Phase 1 to avoid extra
 883                                  * roundtrip.
 884                                  */
 885                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
 886                                            "Phase 2");
 887                                 if (eap_fast_process_phase2_start(sm, data))
 888                                         break;
 889                                 req = eap_fast_build_phase2_req(sm, data, id);
 890                                 piggyback = 1;
 891                         }
 892                 }
 893                 break;
 894         case PHASE2_ID:
 895         case PHASE2_METHOD:
 896                 req = eap_fast_build_phase2_req(sm, data, id);
 897                 break;
 898         case CRYPTO_BINDING:
 899                 req = eap_fast_build_crypto_binding(sm, data);
 900                 if (data->phase2_method) {
 901                         /*
 902                          * Include the start of the next EAP method in the
 903                          * sequence in the same message with Crypto-Binding to
 904                          * save a round-trip.
 905                          */
 906                         struct wpabuf *eap;
 907                         eap = eap_fast_build_phase2_req(sm, data, id);
 908                         req = wpabuf_concat(req, eap);
 909                         eap_fast_state(data, PHASE2_METHOD);
 910                 }
 911                 break;
 912         case REQUEST_PAC:
 913                 req = eap_fast_build_pac(sm, data);
 914                 break;
 915         default:
 916                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 917                            __func__, data->state);
 918                 return NULL;
 919         }
 920
 921         if (req &&
 922             eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
 923                 return NULL;
 924
 925         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
 926                                         data->fast_version, id);
 927 }
 928
 929
 930 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 931                               struct wpabuf *respData)
 932 {
 933         const u8 *pos;
 934         size_t len;
 935
 936         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 937         if (pos == NULL || len < 1) {
 938                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 939                 return TRUE;
 940         }
 941
 942         return FALSE;
 943 }
 944
 945
 946 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 947                                 EapType eap_type)
 948 {
 949         if (data->phase2_priv && data->phase2_method) {
 950                 data->phase2_method->reset(sm, data->phase2_priv);
 951                 data->phase2_method = NULL;
 952                 data->phase2_priv = NULL;
 953         }
 954         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 955                                                         eap_type);
 956         if (!data->phase2_method)
 957                 return -1;
 958
 959         if (data->key_block_p) {
 960                 sm->auth_challenge = data->key_block_p->server_challenge;
 961                 sm->peer_challenge = data->key_block_p->client_challenge;
 962         }
 963         sm->init_phase2 = 1;
 964         data->phase2_priv = data->phase2_method->init(sm);
 965         sm->init_phase2 = 0;
 966         sm->auth_challenge = NULL;
 967         sm->peer_challenge = NULL;
 968
 969         return data->phase2_priv == NULL ? -1 : 0;
 970 }
 971
 972
 973 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 974                                              struct eap_fast_data *data,
 975                                              u8 *in_data, size_t in_len)
 976 {
 977         u8 next_type = EAP_TYPE_NONE;
 978         struct eap_hdr *hdr;
 979         u8 *pos;
 980         size_t left;
 981         struct wpabuf buf;
 982         const struct eap_method *m = data->phase2_method;
 983         void *priv = data->phase2_priv;
 984
 985         if (priv == NULL) {
 986                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 987                            "initialized?!", __func__);
 988                 return;
 989         }
 990
 991         hdr = (struct eap_hdr *) in_data;
 992         pos = (u8 *) (hdr + 1);
 993
 994         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 995                 left = in_len - sizeof(*hdr);
 996                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 997                             "allowed types", pos + 1, left - 1);
 998 #ifdef EAP_SERVER_TNC
 999                 if (m && m->vendor == EAP_VENDOR_IETF &&
1000                     m->method == EAP_TYPE_TNC) {
1001                         wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
1002                                    "TNC negotiation");
1003                         next_type = eap_fast_req_failure(sm, data);
1004                         eap_fast_phase2_init(sm, data, next_type);
1005                         return;
1006                 }
1007 #endif /* EAP_SERVER_TNC */
1008                 eap_sm_process_nak(sm, pos + 1, left - 1);
1009                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1010                     sm->user->methods[sm->user_eap_method_index].method !=
1011                     EAP_TYPE_NONE) {
1012                         next_type = sm->user->methods[
1013                                 sm->user_eap_method_index++].method;
1014                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1015                                    next_type);
1016                 } else {
1017                         next_type = eap_fast_req_failure(sm, data);
1018                 }
1019                 eap_fast_phase2_init(sm, data, next_type);
1020                 return;
1021         }
1022
1023         wpabuf_set(&buf, in_data, in_len);
1024
1025         if (m->check(sm, priv, &buf)) {
1026                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1027                            "ignore the packet");
1028                 eap_fast_req_failure(sm, data);
1029                 return;
1030         }
1031
1032         m->process(sm, priv, &buf);
1033
1034         if (!m->isDone(sm, priv))
1035                 return;
1036
1037         if (!m->isSuccess(sm, priv)) {
1038                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1039                 next_type = eap_fast_req_failure(sm, data);
1040                 eap_fast_phase2_init(sm, data, next_type);
1041                 return;
1042         }
1043
1044         switch (data->state) {
1045         case PHASE2_ID:
1046                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1047                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1048                                           "Identity not found in the user "
1049                                           "database",
1050                                           sm->identity, sm->identity_len);
1051                         next_type = eap_fast_req_failure(sm, data);
1052                         break;
1053                 }
1054
1055                 eap_fast_state(data, PHASE2_METHOD);
1056                 if (data->anon_provisioning) {
1057                         /*
1058                          * Only EAP-MSCHAPv2 is allowed for anonymous
1059                          * provisioning.
1060                          */
1061                         next_type = EAP_TYPE_MSCHAPV2;
1062                         sm->user_eap_method_index = 0;
1063                 } else {
1064                         next_type = sm->user->methods[0].method;
1065                         sm->user_eap_method_index = 1;
1066                 }
1067                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1068                 break;
1069         case PHASE2_METHOD:
1070         case CRYPTO_BINDING:
1071                 eap_fast_update_icmk(sm, data);
1072                 eap_fast_state(data, CRYPTO_BINDING);
1073                 data->eap_seq++;
1074                 next_type = EAP_TYPE_NONE;
1075 #ifdef EAP_SERVER_TNC
1076                 if (sm->tnc && !data->tnc_started) {
1077                         wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1078                         next_type = EAP_TYPE_TNC;
1079                         data->tnc_started = 1;
1080                 }
1081 #endif /* EAP_SERVER_TNC */
1082                 break;
1083         case FAILURE:
1084                 break;
1085         default:
1086                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1087                            __func__, data->state);
1088                 break;
1089         }
1090
1091         eap_fast_phase2_init(sm, data, next_type);
1092 }
1093
1094
1095 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1096                                         struct eap_fast_data *data,
1097                                         u8 *in_data, size_t in_len)
1098 {
1099         struct eap_hdr *hdr;
1100         size_t len;
1101
1102         hdr = (struct eap_hdr *) in_data;
1103         if (in_len < (int) sizeof(*hdr)) {
1104                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1105                            "EAP frame (len=%lu)", (unsigned long) in_len);
1106                 eap_fast_req_failure(sm, data);
1107                 return;
1108         }
1109         len = be_to_host16(hdr->length);
1110         if (len > in_len) {
1111                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1112                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1113                            (unsigned long) in_len, (unsigned long) len);
1114                 eap_fast_req_failure(sm, data);
1115                 return;
1116         }
1117         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1118                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1119                    (unsigned long) len);
1120         switch (hdr->code) {
1121         case EAP_CODE_RESPONSE:
1122                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1123                 break;
1124         default:
1125                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1126                            "Phase 2 EAP header", hdr->code);
1127                 break;
1128         }
1129 }
1130
1131
1132 static int eap_fast_parse_tlvs(struct wpabuf *data,
1133                                struct eap_fast_tlv_parse *tlv)
1134 {
1135         int mandatory, tlv_type, res;
1136         size_t len;
1137         u8 *pos, *end;
1138
1139         os_memset(tlv, 0, sizeof(*tlv));
1140
1141         pos = wpabuf_mhead(data);
1142         end = pos + wpabuf_len(data);
1143         while (end - pos > 4) {
1144                 mandatory = pos[0] & 0x80;
1145                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1146                 pos += 2;
1147                 len = WPA_GET_BE16(pos);
1148                 pos += 2;
1149                 if (len > (size_t) (end - pos)) {
1150                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1151                         return -1;
1152                 }
1153                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1154                            "TLV type %d length %u%s",
1155                            tlv_type, (unsigned int) len,
1156                            mandatory ? " (mandatory)" : "");
1157
1158                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1159                 if (res == -2)
1160                         break;
1161                 if (res < 0) {
1162                         if (mandatory) {
1163                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1164                                            "mandatory TLV type %d", tlv_type);
1165                                 /* TODO: generate Nak TLV */
1166                                 break;
1167                         } else {
1168                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1169                                            "unknown optional TLV type %d",
1170                                            tlv_type);
1171                         }
1172                 }
1173
1174                 pos += len;
1175         }
1176
1177         return 0;
1178 }
1179
1180
1181 static int eap_fast_validate_crypto_binding(
1182         struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1183         size_t bind_len)
1184 {
1185         u8 cmac[SHA1_MAC_LEN];
1186
1187         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1188                    "Version %d Received Version %d SubType %d",
1189                    b->version, b->received_version, b->subtype);
1190         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1191                     b->nonce, sizeof(b->nonce));
1192         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1193                     b->compound_mac, sizeof(b->compound_mac));
1194
1195         if (b->version != EAP_FAST_VERSION ||
1196             b->received_version != EAP_FAST_VERSION) {
1197                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1198                            "in Crypto-Binding: version %d "
1199                            "received_version %d", b->version,
1200                            b->received_version);
1201                 return -1;
1202         }
1203
1204         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1205                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1206                            "Crypto-Binding: %d", b->subtype);
1207                 return -1;
1208         }
1209
1210         if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1211             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1212                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1213                            "Crypto-Binding");
1214                 return -1;
1215         }
1216
1217         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1218         os_memset(b->compound_mac, 0, sizeof(cmac));
1219         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1220                     "Compound MAC calculation",
1221                     (u8 *) b, bind_len);
1222         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1223                   b->compound_mac);
1224         if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1225                 wpa_hexdump(MSG_MSGDUMP,
1226                             "EAP-FAST: Calculated Compound MAC",
1227                             b->compound_mac, sizeof(cmac));
1228                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1229                            "match");
1230                 return -1;
1231         }
1232
1233         return 0;
1234 }
1235
1236
1237 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1238 {
1239         struct eap_tlv_pac_type_tlv *tlv;
1240
1241         if (pac == NULL || len != sizeof(*tlv))
1242                 return 0;
1243
1244         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1245
1246         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1247                 be_to_host16(tlv->length) == 2 &&
1248                 be_to_host16(tlv->pac_type) == type;
1249 }
1250
1251
1252 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1253                                          struct eap_fast_data *data,
1254                                          struct wpabuf *in_data)
1255 {
1256         struct eap_fast_tlv_parse tlv;
1257         int check_crypto_binding = data->state == CRYPTO_BINDING;
1258
1259         if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1260                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1261                            "Phase 2 TLVs");
1262                 return;
1263         }
1264
1265         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1266                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1267                            "failure");
1268                 eap_fast_state(data, FAILURE);
1269                 return;
1270         }
1271
1272         if (data->state == REQUEST_PAC) {
1273                 u16 type, len, res;
1274                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1275                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1276                                    "Acknowledgement received");
1277                         eap_fast_state(data, FAILURE);
1278                         return;
1279                 }
1280
1281                 type = WPA_GET_BE16(tlv.pac);
1282                 len = WPA_GET_BE16(tlv.pac + 2);
1283                 res = WPA_GET_BE16(tlv.pac + 4);
1284
1285                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1286                     res != EAP_TLV_RESULT_SUCCESS) {
1287                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1288                                    "contain acknowledgement");
1289                         eap_fast_state(data, FAILURE);
1290                         return;
1291                 }
1292
1293                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1294                            "- PAC provisioning succeeded");
1295                 eap_fast_state(data, (data->anon_provisioning ||
1296                                       data->send_new_pac == 2) ?
1297                                FAILURE : SUCCESS);
1298                 return;
1299         }
1300
1301         if (check_crypto_binding) {
1302                 if (tlv.crypto_binding == NULL) {
1303                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1304                                    "TLV received");
1305                         eap_fast_state(data, FAILURE);
1306                         return;
1307                 }
1308
1309                 if (data->final_result &&
1310                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1311                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1312                                    "without Success Result");
1313                         eap_fast_state(data, FAILURE);
1314                         return;
1315                 }
1316
1317                 if (!data->final_result &&
1318                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1319                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1320                                    "without intermediate Success Result");
1321                         eap_fast_state(data, FAILURE);
1322                         return;
1323                 }
1324
1325                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1326                                                      tlv.crypto_binding_len)) {
1327                         eap_fast_state(data, FAILURE);
1328                         return;
1329                 }
1330
1331                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1332                            "received");
1333                 if (data->final_result) {
1334                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1335                                    "completed successfully");
1336                 }
1337
1338                 if (data->anon_provisioning &&
1339                     sm->eap_fast_prov != ANON_PROV &&
1340                     sm->eap_fast_prov != BOTH_PROV) {
1341                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1342                                    "use unauthenticated provisioning which is "
1343                                    "disabled");
1344                         eap_fast_state(data, FAILURE);
1345                         return;
1346                 }
1347
1348                 if (sm->eap_fast_prov != AUTH_PROV &&
1349                     sm->eap_fast_prov != BOTH_PROV &&
1350                     tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1351                     eap_fast_pac_type(tlv.pac, tlv.pac_len,
1352                                       PAC_TYPE_TUNNEL_PAC)) {
1353                         wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1354                                    "use authenticated provisioning which is "
1355                                    "disabled");
1356                         eap_fast_state(data, FAILURE);
1357                         return;
1358                 }
1359
1360                 if (data->anon_provisioning ||
1361                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1362                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1363                                        PAC_TYPE_TUNNEL_PAC))) {
1364                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1365                                    "Tunnel PAC");
1366                         eap_fast_state(data, REQUEST_PAC);
1367                 } else if (data->send_new_pac) {
1368                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1369                                    "re-keying of Tunnel PAC");
1370                         eap_fast_state(data, REQUEST_PAC);
1371                 } else if (data->final_result)
1372                         eap_fast_state(data, SUCCESS);
1373         }
1374
1375         if (tlv.eap_payload_tlv) {
1376                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1377                                             tlv.eap_payload_tlv_len);
1378         }
1379 }
1380
1381
1382 static void eap_fast_process_phase2(struct eap_sm *sm,
1383                                     struct eap_fast_data *data,
1384                                     struct wpabuf *in_buf)
1385 {
1386         struct wpabuf *in_decrypted;
1387
1388         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1389                    " Phase 2", (unsigned long) wpabuf_len(in_buf));
1390
1391         if (data->pending_phase2_resp) {
1392                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1393                            "skip decryption and use old data");
1394                 eap_fast_process_phase2_tlvs(sm, data,
1395                                              data->pending_phase2_resp);
1396                 wpabuf_free(data->pending_phase2_resp);
1397                 data->pending_phase2_resp = NULL;
1398                 return;
1399         }
1400
1401         in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1402                                               in_buf);
1403         if (in_decrypted == NULL) {
1404                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1405                            "data");
1406                 eap_fast_state(data, FAILURE);
1407                 return;
1408         }
1409
1410         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1411                             in_decrypted);
1412
1413         eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1414
1415         if (sm->method_pending == METHOD_PENDING_WAIT) {
1416                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1417                            "pending wait state - save decrypted response");
1418                 wpabuf_free(data->pending_phase2_resp);
1419                 data->pending_phase2_resp = in_decrypted;
1420                 return;
1421         }
1422
1423         wpabuf_free(in_decrypted);
1424 }
1425
1426
1427 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1428                                     int peer_version)
1429 {
1430         struct eap_fast_data *data = priv;
1431
1432         data->peer_version = peer_version;
1433
1434         if (data->force_version >= 0 && peer_version != data->force_version) {
1435                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1436                            " version (forced=%d peer=%d) - reject",
1437                            data->force_version, peer_version);
1438                 return -1;
1439         }
1440
1441         if (peer_version < data->fast_version) {
1442                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1443                            "use version %d",
1444                            peer_version, data->fast_version, peer_version);
1445                 data->fast_version = peer_version;
1446         }
1447
1448         return 0;
1449 }
1450
1451
1452 static int eap_fast_process_phase1(struct eap_sm *sm,
1453                                    struct eap_fast_data *data)
1454 {
1455         if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1456                 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1457                 eap_fast_state(data, FAILURE);
1458                 return -1;
1459         }
1460
1461         if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1462             wpabuf_len(data->ssl.tls_out) > 0)
1463                 return 1;
1464
1465         /*
1466          * Phase 1 was completed with the received message (e.g., when using
1467          * abbreviated handshake), so Phase 2 can be started immediately
1468          * without having to send through an empty message to the peer.
1469          */
1470
1471         return eap_fast_phase1_done(sm, data);
1472 }
1473
1474
1475 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1476                                          struct eap_fast_data *data)
1477 {
1478         u8 next_type;
1479
1480         if (data->identity) {
1481                 os_free(sm->identity);
1482                 sm->identity = data->identity;
1483                 data->identity = NULL;
1484                 sm->identity_len = data->identity_len;
1485                 data->identity_len = 0;
1486                 sm->require_identity_match = 1;
1487                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1488                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1489                                           "Phase2 Identity not found "
1490                                           "in the user database",
1491                                           sm->identity, sm->identity_len);
1492                         next_type = eap_fast_req_failure(sm, data);
1493                 } else {
1494                         wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1495                                    "known - skip Phase 2 Identity Request");
1496                         next_type = sm->user->methods[0].method;
1497                         sm->user_eap_method_index = 1;
1498                 }
1499
1500                 eap_fast_state(data, PHASE2_METHOD);
1501         } else {
1502                 eap_fast_state(data, PHASE2_ID);
1503                 next_type = EAP_TYPE_IDENTITY;
1504         }
1505
1506         return eap_fast_phase2_init(sm, data, next_type);
1507 }
1508
1509
1510 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1511                                  const struct wpabuf *respData)
1512 {
1513         struct eap_fast_data *data = priv;
1514
1515         switch (data->state) {
1516         case PHASE1:
1517                 if (eap_fast_process_phase1(sm, data))
1518                         break;
1519
1520                 /* fall through to PHASE2_START */
1521         case PHASE2_START:
1522                 eap_fast_process_phase2_start(sm, data);
1523                 break;
1524         case PHASE2_ID:
1525         case PHASE2_METHOD:
1526         case CRYPTO_BINDING:
1527         case REQUEST_PAC:
1528                 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1529                 break;
1530         default:
1531                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1532                            data->state, __func__);
1533                 break;
1534         }
1535 }
1536
1537
1538 static void eap_fast_process(struct eap_sm *sm, void *priv,
1539                              struct wpabuf *respData)
1540 {
1541         struct eap_fast_data *data = priv;
1542         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1543                                    EAP_TYPE_FAST, eap_fast_process_version,
1544                                    eap_fast_process_msg) < 0)
1545                 eap_fast_state(data, FAILURE);
1546 }
1547
1548
1549 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1550 {
1551         struct eap_fast_data *data = priv;
1552         return data->state == SUCCESS || data->state == FAILURE;
1553 }
1554
1555
1556 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1557 {
1558         struct eap_fast_data *data = priv;
1559         u8 *eapKeyData;
1560
1561         if (data->state != SUCCESS)
1562                 return NULL;
1563
1564         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1565         if (eapKeyData == NULL)
1566                 return NULL;
1567
1568         if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) {
1569                 os_free(eapKeyData);
1570                 return NULL;
1571         }
1572         *len = EAP_FAST_KEY_LEN;
1573
1574         return eapKeyData;
1575 }
1576
1577
1578 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1579 {
1580         struct eap_fast_data *data = priv;
1581         u8 *eapKeyData;
1582
1583         if (data->state != SUCCESS)
1584                 return NULL;
1585
1586         eapKeyData = os_malloc(EAP_EMSK_LEN);
1587         if (eapKeyData == NULL)
1588                 return NULL;
1589
1590         if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) {
1591                 os_free(eapKeyData);
1592                 return NULL;
1593         }
1594         *len = EAP_EMSK_LEN;
1595
1596         return eapKeyData;
1597 }
1598
1599
1600 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1601 {
1602         struct eap_fast_data *data = priv;
1603         return data->state == SUCCESS;
1604 }
1605
1606
1607 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1608 {
1609         struct eap_fast_data *data = priv;
1610
1611         if (data->state != SUCCESS)
1612                 return NULL;
1613
1614         return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1615                                                 len);
1616 }
1617
1618
1619 int eap_server_fast_register(void)
1620 {
1621         struct eap_method *eap;
1622
1623         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1624                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1625         if (eap == NULL)
1626                 return -1;
1627
1628         eap->init = eap_fast_init;
1629         eap->reset = eap_fast_reset;
1630         eap->buildReq = eap_fast_buildReq;
1631         eap->check = eap_fast_check;
1632         eap->process = eap_fast_process;
1633         eap->isDone = eap_fast_isDone;
1634         eap->getKey = eap_fast_getKey;
1635         eap->get_emsk = eap_fast_get_emsk;
1636         eap->isSuccess = eap_fast_isSuccess;
1637         eap->getSessionId = eap_fast_get_session_id;
1638
1639         return eap_server_method_register(eap);
1640 }