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