src/eap_server/eap_fast.c

   1 /*
   2  * EAP-FAST server (RFC 4851)
   3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "aes_wrap.h"
  19 #include "sha1.h"
  20 #include "eap_i.h"
  21 #include "eap_tls_common.h"
  22 #include "tls.h"
  23 #include "eap_common/eap_tlv_common.h"
  24 #include "eap_common/eap_fast_common.h"
  25
  26
  27 static void eap_fast_reset(struct eap_sm *sm, void *priv);
  28
  29
  30 /* Private PAC-Opaque TLV types */
  31 #define PAC_OPAQUE_TYPE_PAD 0
  32 #define PAC_OPAQUE_TYPE_KEY 1
  33 #define PAC_OPAQUE_TYPE_LIFETIME 2
  34 #define PAC_OPAQUE_TYPE_IDENTITY 3
  35
  36 /* PAC-Key lifetime in seconds (hard limit) */
  37 #define PAC_KEY_LIFETIME (7 * 24 * 60 * 60)
  38
  39 /*
  40  * PAC-Key refresh time in seconds (soft limit on remaining hard limit). The
  41  * server will generate a new PAC-Key when this number of seconds (or fewer)
  42  * of the lifetime.
  43  */
  44 #define PAC_KEY_REFRESH_TIME (1 * 24 * 60 * 60)
  45
  46
  47 struct eap_fast_data {
  48         struct eap_ssl_data ssl;
  49         enum {
  50                 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
  51                 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
  52         } state;
  53
  54         int fast_version;
  55         const struct eap_method *phase2_method;
  56         void *phase2_priv;
  57         int force_version;
  58         int peer_version;
  59
  60         u8 crypto_binding_nonce[32];
  61         int final_result;
  62
  63         struct eap_fast_key_block_provisioning *key_block_p;
  64
  65         u8 simck[EAP_FAST_SIMCK_LEN];
  66         u8 cmk[EAP_FAST_CMK_LEN];
  67         int simck_idx;
  68
  69         u8 pac_opaque_encr[16];
  70         char *srv_id;
  71
  72         int anon_provisioning;
  73         int send_new_pac; /* server triggered re-keying of Tunnel PAC */
  74         struct wpabuf *pending_phase2_resp;
  75         u8 *identity; /* from PAC-Opaque */
  76         size_t identity_len;
  77         int eap_seq;
  78 };
  79
  80
  81 static const char * eap_fast_state_txt(int state)
  82 {
  83         switch (state) {
  84         case START:
  85                 return "START";
  86         case PHASE1:
  87                 return "PHASE1";
  88         case PHASE2_START:
  89                 return "PHASE2_START";
  90         case PHASE2_ID:
  91                 return "PHASE2_ID";
  92         case PHASE2_METHOD:
  93                 return "PHASE2_METHOD";
  94         case CRYPTO_BINDING:
  95                 return "CRYPTO_BINDING";
  96         case REQUEST_PAC:
  97                 return "REQUEST_PAC";
  98         case SUCCESS:
  99                 return "SUCCESS";
 100         case FAILURE:
 101                 return "FAILURE";
 102         default:
 103                 return "Unknown?!";
 104         }
 105 }
 106
 107
 108 static void eap_fast_state(struct eap_fast_data *data, int state)
 109 {
 110         wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
 111                    eap_fast_state_txt(data->state),
 112                    eap_fast_state_txt(state));
 113         data->state = state;
 114 }
 115
 116
 117 static EapType eap_fast_req_failure(struct eap_sm *sm,
 118                                     struct eap_fast_data *data)
 119 {
 120         /* TODO: send Result TLV(FAILURE) */
 121         eap_fast_state(data, FAILURE);
 122         return EAP_TYPE_NONE;
 123 }
 124
 125
 126 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
 127                                       const u8 *client_random,
 128                                       const u8 *server_random,
 129                                       u8 *master_secret)
 130 {
 131         struct eap_fast_data *data = ctx;
 132         const u8 *pac_opaque;
 133         size_t pac_opaque_len;
 134         u8 *buf, *pos, *end, *pac_key = NULL;
 135         os_time_t lifetime = 0;
 136         struct os_time now;
 137         u8 *identity = NULL;
 138         size_t identity_len = 0;
 139
 140         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
 141         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
 142                     ticket, len);
 143
 144         if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
 145                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
 146                            "SessionTicket");
 147                 return 0;
 148         }
 149
 150         pac_opaque_len = WPA_GET_BE16(ticket + 2);
 151         pac_opaque = ticket + 4;
 152         if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
 153             pac_opaque_len > len - 4) {
 154                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
 155                            "(len=%lu left=%lu)",
 156                            (unsigned long) pac_opaque_len,
 157                            (unsigned long) len);
 158                 return 0;
 159         }
 160         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
 161                     pac_opaque, pac_opaque_len);
 162
 163         buf = os_malloc(pac_opaque_len - 8);
 164         if (buf == NULL) {
 165                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
 166                            "for decrypting PAC-Opaque");
 167                 return 0;
 168         }
 169
 170         if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
 171                        pac_opaque, buf) < 0) {
 172                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
 173                            "PAC-Opaque");
 174                 os_free(buf);
 175                 /*
 176                  * This may have been caused by server changing the PAC-Opaque
 177                  * encryption key, so just ignore this PAC-Opaque instead of
 178                  * failing the authentication completely. Provisioning can now
 179                  * be used to provision a new PAC.
 180                  */
 181                 return 0;
 182         }
 183
 184         end = buf + pac_opaque_len - 8;
 185         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
 186                         buf, end - buf);
 187
 188         pos = buf;
 189         while (pos + 1 < end) {
 190                 if (pos + 2 + pos[1] > end)
 191                         break;
 192
 193                 switch (*pos) {
 194                 case PAC_OPAQUE_TYPE_PAD:
 195                         pos = end;
 196                         break;
 197                 case PAC_OPAQUE_TYPE_KEY:
 198                         if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
 199                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 200                                            "PAC-Key length %d", pos[1]);
 201                                 os_free(buf);
 202                                 return -1;
 203                         }
 204                         pac_key = pos + 2;
 205                         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
 206                                         "decrypted PAC-Opaque",
 207                                         pac_key, EAP_FAST_PAC_KEY_LEN);
 208                         break;
 209                 case PAC_OPAQUE_TYPE_LIFETIME:
 210                         if (pos[1] != 4) {
 211                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
 212                                            "PAC-Key lifetime length %d",
 213                                            pos[1]);
 214                                 os_free(buf);
 215                                 return -1;
 216                         }
 217                         lifetime = WPA_GET_BE32(pos + 2);
 218                         break;
 219                 case PAC_OPAQUE_TYPE_IDENTITY:
 220                         identity = pos + 2;
 221                         identity_len = pos[1];
 222                         break;
 223                 }
 224
 225                 pos += 2 + pos[1];
 226         }
 227
 228         if (pac_key == NULL) {
 229                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
 230                            "PAC-Opaque");
 231                 os_free(buf);
 232                 return -1;
 233         }
 234
 235         if (identity) {
 236                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
 237                                   "PAC-Opaque", identity, identity_len);
 238                 os_free(data->identity);
 239                 data->identity = os_malloc(identity_len);
 240                 if (data->identity) {
 241                         os_memcpy(data->identity, identity, identity_len);
 242                         data->identity_len = identity_len;
 243                 }
 244         }
 245
 246         if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
 247                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
 248                            "(lifetime=%ld now=%ld)", lifetime, now.sec);
 249                 os_free(buf);
 250                 return 0;
 251         }
 252
 253         if (lifetime - now.sec < PAC_KEY_REFRESH_TIME)
 254                 data->send_new_pac = 1;
 255
 256         eap_fast_derive_master_secret(pac_key, server_random, client_random,
 257                                       master_secret);
 258
 259         os_free(buf);
 260
 261         return 1;
 262 }
 263
 264
 265 static void eap_fast_derive_key_auth(struct eap_sm *sm,
 266                                      struct eap_fast_data *data)
 267 {
 268         u8 *sks;
 269
 270         /* RFC 4851, Section 5.1:
 271          * Extra key material after TLS key_block: session_key_seed[40]
 272          */
 273
 274         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
 275                                   EAP_FAST_SKS_LEN);
 276         if (sks == NULL) {
 277                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 278                            "session_key_seed");
 279                 return;
 280         }
 281
 282         /*
 283          * RFC 4851, Section 5.2:
 284          * S-IMCK[0] = session_key_seed
 285          */
 286         wpa_hexdump_key(MSG_DEBUG,
 287                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 288                         sks, EAP_FAST_SKS_LEN);
 289         data->simck_idx = 0;
 290         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 291         os_free(sks);
 292 }
 293
 294
 295 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
 296                                              struct eap_fast_data *data)
 297 {
 298         os_free(data->key_block_p);
 299         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 300                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 301                                     "key expansion",
 302                                     sizeof(*data->key_block_p));
 303         if (data->key_block_p == NULL) {
 304                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 305                 return;
 306         }
 307         /*
 308          * RFC 4851, Section 5.2:
 309          * S-IMCK[0] = session_key_seed
 310          */
 311         wpa_hexdump_key(MSG_DEBUG,
 312                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 313                         data->key_block_p->session_key_seed,
 314                         sizeof(data->key_block_p->session_key_seed));
 315         data->simck_idx = 0;
 316         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 317                   EAP_FAST_SIMCK_LEN);
 318         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 319                         data->key_block_p->server_challenge,
 320                         sizeof(data->key_block_p->server_challenge));
 321         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 322                         data->key_block_p->client_challenge,
 323                         sizeof(data->key_block_p->client_challenge));
 324 }
 325
 326
 327 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 328                                    struct eap_fast_data *data,
 329                                    u8 *isk, size_t isk_len)
 330 {
 331         u8 *key;
 332         size_t key_len;
 333
 334         os_memset(isk, 0, isk_len);
 335
 336         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 337                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 338                            "available");
 339                 return -1;
 340         }
 341
 342         if (data->phase2_method->getKey == NULL)
 343                 return 0;
 344
 345         if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
 346                                                &key_len)) == NULL) {
 347                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 348                            "from Phase 2");
 349                 return -1;
 350         }
 351
 352         if (key_len > isk_len)
 353                 key_len = isk_len;
 354         os_memcpy(isk, key, key_len);
 355         os_free(key);
 356
 357         return 0;
 358 }
 359
 360
 361 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
 362 {
 363         u8 isk[32], imck[60];
 364
 365         wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
 366                    data->simck_idx + 1);
 367
 368         /*
 369          * RFC 4851, Section 5.2:
 370          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 371          *                 MSK[j], 60)
 372          * S-IMCK[j] = first 40 octets of IMCK[j]
 373          * CMK[j] = last 20 octets of IMCK[j]
 374          */
 375
 376         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 377                 return -1;
 378         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 379         sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 380                    "Inner Methods Compound Keys",
 381                    isk, sizeof(isk), imck, sizeof(imck));
 382         data->simck_idx++;
 383         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 384         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 385                         data->simck, EAP_FAST_SIMCK_LEN);
 386         os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 387         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 388                         data->cmk, EAP_FAST_CMK_LEN);
 389
 390         return 0;
 391 }
 392
 393
 394 static void * eap_fast_init(struct eap_sm *sm)
 395 {
 396         struct eap_fast_data *data;
 397         u8 ciphers[5] = {
 398                 TLS_CIPHER_ANON_DH_AES128_SHA,
 399                 TLS_CIPHER_AES128_SHA,
 400                 TLS_CIPHER_RSA_DHE_AES128_SHA,
 401                 TLS_CIPHER_RC4_SHA,
 402                 TLS_CIPHER_NONE
 403         };
 404
 405         data = os_zalloc(sizeof(*data));
 406         if (data == NULL)
 407                 return NULL;
 408         data->fast_version = EAP_FAST_VERSION;
 409         data->force_version = -1;
 410         if (sm->user && sm->user->force_version >= 0) {
 411                 data->force_version = sm->user->force_version;
 412                 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
 413                            data->force_version);
 414                 data->fast_version = data->force_version;
 415         }
 416         data->state = START;
 417
 418         if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
 419                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 420                 eap_fast_reset(sm, data);
 421                 return NULL;
 422         }
 423
 424         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
 425                                            ciphers) < 0) {
 426                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
 427                            "suites");
 428                 eap_fast_reset(sm, data);
 429                 return NULL;
 430         }
 431
 432         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 433                                                  eap_fast_session_ticket_cb,
 434                                                  data) < 0) {
 435                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 436                            "callback");
 437                 eap_fast_reset(sm, data);
 438                 return NULL;
 439         }
 440
 441         if (sm->pac_opaque_encr_key == NULL) {
 442                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
 443                            "configured");
 444                 eap_fast_reset(sm, data);
 445                 return NULL;
 446         }
 447         os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
 448                   sizeof(data->pac_opaque_encr));
 449
 450         if (sm->eap_fast_a_id == NULL) {
 451                 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
 452                 eap_fast_reset(sm, data);
 453                 return NULL;
 454         }
 455         data->srv_id = os_strdup(sm->eap_fast_a_id);
 456         if (data->srv_id == NULL) {
 457                 eap_fast_reset(sm, data);
 458                 return NULL;
 459         }
 460
 461         return data;
 462 }
 463
 464
 465 static void eap_fast_reset(struct eap_sm *sm, void *priv)
 466 {
 467         struct eap_fast_data *data = priv;
 468         if (data == NULL)
 469                 return;
 470         if (data->phase2_priv && data->phase2_method)
 471                 data->phase2_method->reset(sm, data->phase2_priv);
 472         eap_server_tls_ssl_deinit(sm, &data->ssl);
 473         os_free(data->srv_id);
 474         os_free(data->key_block_p);
 475         wpabuf_free(data->pending_phase2_resp);
 476         os_free(data->identity);
 477         os_free(data);
 478 }
 479
 480
 481 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
 482                                             struct eap_fast_data *data, u8 id)
 483 {
 484         struct wpabuf *req;
 485         size_t srv_id_len = os_strlen(data->srv_id);
 486
 487         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 488                             1 + sizeof(struct pac_tlv_hdr) + srv_id_len,
 489                             EAP_CODE_REQUEST, id);
 490         if (req == NULL) {
 491                 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
 492                            " request");
 493                 eap_fast_state(data, FAILURE);
 494                 return NULL;
 495         }
 496
 497         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
 498
 499         /* RFC 4851, 4.1.1. Authority ID Data */
 500         eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, srv_id_len);
 501
 502         eap_fast_state(data, PHASE1);
 503
 504         return req;
 505 }
 506
 507
 508 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
 509 {
 510         char cipher[64];
 511
 512         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
 513
 514         if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
 515             < 0) {
 516                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
 517                            "information");
 518                 eap_fast_state(data, FAILURE);
 519                 return -1;
 520         }
 521         data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
 522
 523         if (data->anon_provisioning) {
 524                 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
 525                 eap_fast_derive_key_provisioning(sm, data);
 526         } else
 527                 eap_fast_derive_key_auth(sm, data);
 528
 529         eap_fast_state(data, PHASE2_START);
 530
 531         return 0;
 532 }
 533
 534
 535 static struct wpabuf * eap_fast_build_req(struct eap_sm *sm,
 536                                           struct eap_fast_data *data, u8 id)
 537 {
 538         int res;
 539         struct wpabuf *req;
 540
 541         res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_FAST,
 542                                              data->fast_version, id, &req);
 543
 544         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 545                 if (eap_fast_phase1_done(sm, data) < 0) {
 546                         os_free(req);
 547                         return NULL;
 548                 }
 549         }
 550
 551         if (res == 1)
 552                 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
 553                                                 data->fast_version);
 554         return req;
 555 }
 556
 557
 558 static struct wpabuf * eap_fast_encrypt(struct eap_sm *sm,
 559                                         struct eap_fast_data *data,
 560                                         u8 id, u8 *plain, size_t plain_len)
 561 {
 562         int res;
 563         struct wpabuf *buf;
 564
 565         /* TODO: add support for fragmentation, if needed. This will need to
 566          * add TLS Message Length field, if the frame is fragmented. */
 567         buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
 568                             1 + data->ssl.tls_out_limit,
 569                             EAP_CODE_REQUEST, id);
 570         if (buf == NULL)
 571                 return NULL;
 572
 573         wpabuf_put_u8(buf, data->fast_version);
 574
 575         res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
 576                                      plain, plain_len, wpabuf_put(buf, 0),
 577                                      data->ssl.tls_out_limit);
 578         if (res < 0) {
 579                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt Phase 2 "
 580                            "data");
 581                 wpabuf_free(buf);
 582                 return NULL;
 583         }
 584
 585         wpabuf_put(buf, res);
 586         eap_update_len(buf);
 587
 588         return buf;
 589 }
 590
 591
 592 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
 593                                                  struct eap_fast_data *data,
 594                                                  u8 id)
 595 {
 596         struct wpabuf *req;
 597
 598         if (data->phase2_priv == NULL) {
 599                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 600                            "initialized");
 601                 return NULL;
 602         }
 603         req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 604         if (req == NULL)
 605                 return NULL;
 606
 607         wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
 608         return eap_fast_tlv_eap_payload(req);
 609 }
 610
 611
 612 static struct wpabuf * eap_fast_build_crypto_binding(
 613         struct eap_sm *sm, struct eap_fast_data *data)
 614 {
 615         struct wpabuf *buf;
 616         struct eap_tlv_result_tlv *result;
 617         struct eap_tlv_crypto_binding_tlv *binding;
 618
 619         buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
 620         if (buf == NULL)
 621                 return NULL;
 622
 623         if (data->send_new_pac || data->anon_provisioning ||
 624             data->phase2_method)
 625                 data->final_result = 0;
 626         else
 627                 data->final_result = 1;
 628
 629         if (!data->final_result || data->eap_seq > 1) {
 630                 /* Intermediate-Result */
 631                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
 632                            "(status=SUCCESS)");
 633                 result = wpabuf_put(buf, sizeof(*result));
 634                 result->tlv_type = host_to_be16(
 635                         EAP_TLV_TYPE_MANDATORY |
 636                         EAP_TLV_INTERMEDIATE_RESULT_TLV);
 637                 result->length = host_to_be16(2);
 638                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 639         }
 640
 641         if (data->final_result) {
 642                 /* Result TLV */
 643                 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
 644                            "(status=SUCCESS)");
 645                 result = wpabuf_put(buf, sizeof(*result));
 646                 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 647                                                 EAP_TLV_RESULT_TLV);
 648                 result->length = host_to_be16(2);
 649                 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 650         }
 651
 652         /* Crypto-Binding TLV */
 653         binding = wpabuf_put(buf, sizeof(*binding));
 654         binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 655                                          EAP_TLV_CRYPTO_BINDING_TLV);
 656         binding->length = host_to_be16(sizeof(*binding) -
 657                                        sizeof(struct eap_tlv_hdr));
 658         binding->version = EAP_FAST_VERSION;
 659         binding->received_version = data->peer_version;
 660         binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 661         if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
 662                 wpabuf_free(buf);
 663                 return NULL;
 664         }
 665
 666         /*
 667          * RFC 4851, Section 4.2.8:
 668          * The nonce in a request MUST have its least significant bit set to 0.
 669          */
 670         binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
 671
 672         os_memcpy(data->crypto_binding_nonce, binding->nonce,
 673                   sizeof(binding->nonce));
 674
 675         /*
 676          * RFC 4851, Section 5.3:
 677          * CMK = CMK[j]
 678          * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
 679          */
 680
 681         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
 682                   (u8 *) binding, sizeof(*binding),
 683                   binding->compound_mac);
 684
 685         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
 686                    "Received Version %d SubType %d",
 687                    binding->version, binding->received_version,
 688                    binding->subtype);
 689         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 690                     binding->nonce, sizeof(binding->nonce));
 691         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 692                     binding->compound_mac, sizeof(binding->compound_mac));
 693
 694         return buf;
 695 }
 696
 697
 698 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
 699                                           struct eap_fast_data *data)
 700 {
 701         u8 pac_key[EAP_FAST_PAC_KEY_LEN];
 702         u8 *pac_buf, *pac_opaque;
 703         struct wpabuf *buf;
 704         u8 *pos;
 705         size_t buf_len, srv_id_len, pac_len;
 706         struct eap_tlv_hdr *pac_tlv;
 707         struct pac_tlv_hdr *pac_info;
 708         struct eap_tlv_result_tlv *result;
 709         struct os_time now;
 710
 711         if (os_get_random(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
 712             os_get_time(&now) < 0)
 713                 return NULL;
 714         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
 715                         pac_key, EAP_FAST_PAC_KEY_LEN);
 716
 717         pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
 718                 (2 + sm->identity_len) + 8;
 719         pac_buf = os_malloc(pac_len);
 720         if (pac_buf == NULL)
 721                 return NULL;
 722
 723         srv_id_len = os_strlen(data->srv_id);
 724
 725         pos = pac_buf;
 726         *pos++ = PAC_OPAQUE_TYPE_KEY;
 727         *pos++ = EAP_FAST_PAC_KEY_LEN;
 728         os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
 729         pos += EAP_FAST_PAC_KEY_LEN;
 730
 731         *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
 732         *pos++ = 4;
 733         WPA_PUT_BE32(pos, now.sec + PAC_KEY_LIFETIME);
 734         pos += 4;
 735
 736         if (sm->identity) {
 737                 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
 738                 *pos++ = sm->identity_len;
 739                 os_memcpy(pos, sm->identity, sm->identity_len);
 740                 pos += sm->identity_len;
 741         }
 742
 743         pac_len = pos - pac_buf;
 744         if (pac_len % 8) {
 745                 *pos++ = PAC_OPAQUE_TYPE_PAD;
 746                 pac_len++;
 747         }
 748
 749         pac_opaque = os_malloc(pac_len + 8);
 750         if (pac_opaque == NULL) {
 751                 os_free(pac_buf);
 752                 return NULL;
 753         }
 754         if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
 755                      pac_opaque) < 0) {
 756                 os_free(pac_buf);
 757                 os_free(pac_opaque);
 758                 return NULL;
 759         }
 760         os_free(pac_buf);
 761
 762         pac_len += 8;
 763         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
 764                     pac_opaque, pac_len);
 765
 766         buf_len = sizeof(*pac_tlv) +
 767                 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
 768                 sizeof(struct pac_tlv_hdr) + pac_len +
 769                 2 * srv_id_len + 100 + sizeof(*result);
 770         buf = wpabuf_alloc(buf_len);
 771         if (buf == NULL) {
 772                 os_free(pac_opaque);
 773                 return NULL;
 774         }
 775
 776         /* PAC TLV */
 777         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
 778         pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
 779         pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 780                                          EAP_TLV_PAC_TLV);
 781
 782         /* PAC-Key */
 783         eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
 784
 785         /* PAC-Opaque */
 786         eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
 787         os_free(pac_opaque);
 788
 789         /* PAC-Info */
 790         pac_info = wpabuf_put(buf, sizeof(*pac_info));
 791         pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
 792
 793         /* PAC-Lifetime (inside PAC-Info) */
 794         eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
 795         wpabuf_put_be32(buf, now.sec + PAC_KEY_LIFETIME);
 796
 797         /* A-ID (inside PAC-Info) */
 798         eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, srv_id_len);
 799
 800         /* Note: headers may be misaligned after A-ID */
 801
 802         /* A-ID-Info (inside PAC-Info) */
 803         eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id, srv_id_len);
 804
 805         /* PAC-Type (inside PAC-Info) */
 806         eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
 807         wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
 808
 809         /* Update PAC-Info and PAC TLV Length fields */
 810         pos = wpabuf_put(buf, 0);
 811         pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
 812         pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
 813
 814         /* Result TLV */
 815         wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
 816         result = wpabuf_put(buf, sizeof(*result));
 817         WPA_PUT_BE16((u8 *) &result->tlv_type,
 818                      EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
 819         WPA_PUT_BE16((u8 *) &result->length, 2);
 820         WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
 821
 822         return buf;
 823 }
 824
 825
 826 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
 827 {
 828         struct eap_fast_data *data = priv;
 829         struct wpabuf *req;
 830         struct wpabuf *encr;
 831
 832         if (data->state == START)
 833                 return eap_fast_build_start(sm, data, id);
 834
 835         if (data->state == PHASE1)
 836                 return eap_fast_build_req(sm, data, id);
 837
 838         switch (data->state) {
 839         case PHASE2_ID:
 840         case PHASE2_METHOD:
 841                 req = eap_fast_build_phase2_req(sm, data, id);
 842                 break;
 843         case CRYPTO_BINDING:
 844                 req = eap_fast_build_crypto_binding(sm, data);
 845                 if (data->phase2_method) {
 846                         /*
 847                          * Include the start of the next EAP method in the
 848                          * sequence in the same message with Crypto-Binding to
 849                          * save a round-trip.
 850                          */
 851                         struct wpabuf *eap;
 852                         eap = eap_fast_build_phase2_req(sm, data, id);
 853                         req = wpabuf_concat(req, eap);
 854                 }
 855                 break;
 856         case REQUEST_PAC:
 857                 req = eap_fast_build_pac(sm, data);
 858                 break;
 859         default:
 860                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
 861                            __func__, data->state);
 862                 return NULL;
 863         }
 864
 865         if (req == NULL)
 866                 return NULL;
 867
 868         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
 869                             req);
 870         encr = eap_fast_encrypt(sm, data, id, wpabuf_mhead(req),
 871                                 wpabuf_len(req));
 872         wpabuf_free(req);
 873
 874         return encr;
 875 }
 876
 877
 878 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
 879                               struct wpabuf *respData)
 880 {
 881         const u8 *pos;
 882         size_t len;
 883
 884         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
 885         if (pos == NULL || len < 1) {
 886                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
 887                 return TRUE;
 888         }
 889
 890         return FALSE;
 891 }
 892
 893
 894 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
 895                                 EapType eap_type)
 896 {
 897         if (data->phase2_priv && data->phase2_method) {
 898                 data->phase2_method->reset(sm, data->phase2_priv);
 899                 data->phase2_method = NULL;
 900                 data->phase2_priv = NULL;
 901         }
 902         data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
 903                                                         eap_type);
 904         if (!data->phase2_method)
 905                 return -1;
 906
 907         if (data->key_block_p) {
 908                 sm->auth_challenge = data->key_block_p->server_challenge;
 909                 sm->peer_challenge = data->key_block_p->client_challenge;
 910         }
 911         sm->init_phase2 = 1;
 912         data->phase2_priv = data->phase2_method->init(sm);
 913         sm->init_phase2 = 0;
 914         sm->auth_challenge = NULL;
 915         sm->peer_challenge = NULL;
 916
 917         return data->phase2_priv == NULL ? -1 : 0;
 918 }
 919
 920
 921 static void eap_fast_process_phase2_response(struct eap_sm *sm,
 922                                              struct eap_fast_data *data,
 923                                              u8 *in_data, size_t in_len)
 924 {
 925         u8 next_type = EAP_TYPE_NONE;
 926         struct eap_hdr *hdr;
 927         u8 *pos;
 928         size_t left;
 929         struct wpabuf buf;
 930         const struct eap_method *m = data->phase2_method;
 931         void *priv = data->phase2_priv;
 932
 933         if (priv == NULL) {
 934                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
 935                            "initialized?!", __func__);
 936                 return;
 937         }
 938
 939         hdr = (struct eap_hdr *) in_data;
 940         pos = (u8 *) (hdr + 1);
 941
 942         if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 943                 left = in_len - sizeof(*hdr);
 944                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
 945                             "allowed types", pos + 1, left - 1);
 946                 eap_sm_process_nak(sm, pos + 1, left - 1);
 947                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
 948                     sm->user->methods[sm->user_eap_method_index].method !=
 949                     EAP_TYPE_NONE) {
 950                         next_type = sm->user->methods[
 951                                 sm->user_eap_method_index++].method;
 952                         wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
 953                                    next_type);
 954                 } else {
 955                         next_type = eap_fast_req_failure(sm, data);
 956                 }
 957                 eap_fast_phase2_init(sm, data, next_type);
 958                 return;
 959         }
 960
 961         wpabuf_set(&buf, in_data, in_len);
 962
 963         if (m->check(sm, priv, &buf)) {
 964                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
 965                            "ignore the packet");
 966                 next_type = eap_fast_req_failure(sm, data);
 967                 return;
 968         }
 969
 970         m->process(sm, priv, &buf);
 971
 972         if (!m->isDone(sm, priv))
 973                 return;
 974
 975         if (!m->isSuccess(sm, priv)) {
 976                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
 977                 next_type = eap_fast_req_failure(sm, data);
 978                 eap_fast_phase2_init(sm, data, next_type);
 979                 return;
 980         }
 981
 982         switch (data->state) {
 983         case PHASE2_ID:
 984                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
 985                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
 986                                           "Identity not found in the user "
 987                                           "database",
 988                                           sm->identity, sm->identity_len);
 989                         next_type = eap_fast_req_failure(sm, data);
 990                         break;
 991                 }
 992
 993                 eap_fast_state(data, PHASE2_METHOD);
 994                 if (data->anon_provisioning) {
 995                         /*
 996                          * Only EAP-MSCHAPv2 is allowed for anonymous
 997                          * provisioning.
 998                          */
 999                         next_type = EAP_TYPE_MSCHAPV2;
1000                         sm->user_eap_method_index = 0;
1001                 } else {
1002                         next_type = sm->user->methods[0].method;
1003                         sm->user_eap_method_index = 1;
1004                 }
1005                 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1006                 break;
1007         case PHASE2_METHOD:
1008         case CRYPTO_BINDING:
1009                 eap_fast_update_icmk(sm, data);
1010                 eap_fast_state(data, CRYPTO_BINDING);
1011                 data->eap_seq++;
1012                 next_type = EAP_TYPE_NONE;
1013                 /* TODO: could start another EAP method in sequence by setting
1014                  * next_type to the selected method */
1015                 break;
1016         case FAILURE:
1017                 break;
1018         default:
1019                 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1020                            __func__, data->state);
1021                 break;
1022         }
1023
1024         eap_fast_phase2_init(sm, data, next_type);
1025 }
1026
1027
1028 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1029                                         struct eap_fast_data *data,
1030                                         u8 *in_data, size_t in_len)
1031 {
1032         struct eap_hdr *hdr;
1033         size_t len;
1034
1035         hdr = (struct eap_hdr *) in_data;
1036         if (in_len < (int) sizeof(*hdr)) {
1037                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1038                            "EAP frame (len=%d)", in_len);
1039                 eap_fast_req_failure(sm, data);
1040                 return;
1041         }
1042         len = be_to_host16(hdr->length);
1043         if (len > in_len) {
1044                 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1045                            "Phase 2 EAP frame (len=%d hdr->length=%d)",
1046                            in_len, len);
1047                 eap_fast_req_failure(sm, data);
1048                 return;
1049         }
1050         wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1051                    "identifier=%d length=%d", hdr->code, hdr->identifier, len);
1052         switch (hdr->code) {
1053         case EAP_CODE_RESPONSE:
1054                 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1055                 break;
1056         default:
1057                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1058                            "Phase 2 EAP header", hdr->code);
1059                 break;
1060         }
1061 }
1062
1063
1064 static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
1065                                struct eap_fast_tlv_parse *tlv)
1066 {
1067         int mandatory, tlv_type, len, res;
1068         u8 *pos, *end;
1069
1070         os_memset(tlv, 0, sizeof(*tlv));
1071
1072         pos = data;
1073         end = data + data_len;
1074         while (pos + 4 < end) {
1075                 mandatory = pos[0] & 0x80;
1076                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1077                 pos += 2;
1078                 len = WPA_GET_BE16(pos);
1079                 pos += 2;
1080                 if (pos + len > end) {
1081                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1082                         return -1;
1083                 }
1084                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1085                            "TLV type %d length %d%s",
1086                            tlv_type, len, mandatory ? " (mandatory)" : "");
1087
1088                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1089                 if (res == -2)
1090                         break;
1091                 if (res < 0) {
1092                         if (mandatory) {
1093                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1094                                            "mandatory TLV type %d", tlv_type);
1095                                 /* TODO: generate Nak TLV */
1096                                 break;
1097                         } else {
1098                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1099                                            "unknown optional TLV type %d",
1100                                            tlv_type);
1101                         }
1102                 }
1103
1104                 pos += len;
1105         }
1106
1107         return 0;
1108 }
1109
1110
1111 static int eap_fast_validate_crypto_binding(
1112         struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1113         size_t bind_len)
1114 {
1115         u8 cmac[SHA1_MAC_LEN];
1116
1117         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1118                    "Version %d Received Version %d SubType %d",
1119                    b->version, b->received_version, b->subtype);
1120         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1121                     b->nonce, sizeof(b->nonce));
1122         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1123                     b->compound_mac, sizeof(b->compound_mac));
1124
1125         if (b->version != EAP_FAST_VERSION ||
1126             b->received_version != EAP_FAST_VERSION) {
1127                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1128                            "in Crypto-Binding: version %d "
1129                            "received_version %d", b->version,
1130                            b->received_version);
1131                 return -1;
1132         }
1133
1134         if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1135                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1136                            "Crypto-Binding: %d", b->subtype);
1137                 return -1;
1138         }
1139
1140         if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1141             (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1142                 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1143                            "Crypto-Binding");
1144                 return -1;
1145         }
1146
1147         os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1148         os_memset(b->compound_mac, 0, sizeof(cmac));
1149         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1150                     "Compound MAC calculation",
1151                     (u8 *) b, bind_len);
1152         hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1153                   b->compound_mac);
1154         if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1155                 wpa_hexdump(MSG_MSGDUMP,
1156                             "EAP-FAST: Calculated Compound MAC",
1157                             b->compound_mac, sizeof(cmac));
1158                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1159                            "match");
1160                 return -1;
1161         }
1162
1163         return 0;
1164 }
1165
1166
1167 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1168 {
1169         struct eap_tlv_pac_type_tlv *tlv;
1170
1171         if (pac == NULL || len != sizeof(*tlv))
1172                 return 0;
1173
1174         tlv = (struct eap_tlv_pac_type_tlv *) pac;
1175
1176         return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1177                 be_to_host16(tlv->length) == 2 &&
1178                 be_to_host16(tlv->pac_type) == type;
1179 }
1180
1181
1182 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1183                                          struct eap_fast_data *data,
1184                                          u8 *in_data, size_t in_len)
1185 {
1186         struct eap_fast_tlv_parse tlv;
1187         int check_crypto_binding = data->state == CRYPTO_BINDING;
1188
1189         if (eap_fast_parse_tlvs(in_data, in_len, &tlv) < 0) {
1190                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1191                            "Phase 2 TLVs");
1192                 return;
1193         }
1194
1195         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1196                 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1197                            "failure");
1198                 eap_fast_state(data, FAILURE);
1199                 return;
1200         }
1201
1202         if (data->state == REQUEST_PAC) {
1203                 u16 type, len, res;
1204                 if (tlv.pac == NULL || tlv.pac_len < 6) {
1205                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1206                                    "Acknowledgement received");
1207                         eap_fast_state(data, FAILURE);
1208                         return;
1209                 }
1210
1211                 type = WPA_GET_BE16(tlv.pac);
1212                 len = WPA_GET_BE16(tlv.pac + 2);
1213                 res = WPA_GET_BE16(tlv.pac + 4);
1214
1215                 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1216                     res != EAP_TLV_RESULT_SUCCESS) {
1217                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1218                                    "contain acknowledgement");
1219                         eap_fast_state(data, FAILURE);
1220                         return;
1221                 }
1222
1223                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1224                            "- PAC provisioning succeeded");
1225                 eap_fast_state(data, data->anon_provisioning ?
1226                                FAILURE : SUCCESS);
1227                 return;
1228         }
1229
1230         if (check_crypto_binding) {
1231                 if (tlv.crypto_binding == NULL) {
1232                         wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1233                                    "TLV received");
1234                         eap_fast_state(data, FAILURE);
1235                         return;
1236                 }
1237
1238                 if (data->final_result &&
1239                     tlv.result != EAP_TLV_RESULT_SUCCESS) {
1240                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1241                                    "without Success Result");
1242                         eap_fast_state(data, FAILURE);
1243                         return;
1244                 }
1245
1246                 if (!data->final_result &&
1247                     tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1248                         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1249                                    "without intermediate Success Result");
1250                         eap_fast_state(data, FAILURE);
1251                         return;
1252                 }
1253
1254                 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1255                                                      tlv.crypto_binding_len)) {
1256                         eap_fast_state(data, FAILURE);
1257                         return;
1258                 }
1259
1260                 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1261                            "received");
1262                 if (data->final_result) {
1263                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1264                                    "completed successfully");
1265                 }
1266
1267                 if (data->anon_provisioning ||
1268                     (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1269                      eap_fast_pac_type(tlv.pac, tlv.pac_len,
1270                                        PAC_TYPE_TUNNEL_PAC))) {
1271                         wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1272                                    "Tunnel PAC");
1273                         eap_fast_state(data, REQUEST_PAC);
1274                 } else if (data->send_new_pac) {
1275                         wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1276                                    "re-keying of Tunnel PAC");
1277                         eap_fast_state(data, REQUEST_PAC);
1278                 } else if (data->final_result)
1279                         eap_fast_state(data, SUCCESS);
1280         }
1281
1282         if (tlv.eap_payload_tlv) {
1283                 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1284                                             tlv.eap_payload_tlv_len);
1285         }
1286 }
1287
1288
1289 static void eap_fast_process_phase2(struct eap_sm *sm,
1290                                     struct eap_fast_data *data,
1291                                     const u8 *in_data, size_t in_len)
1292 {
1293         u8 *in_decrypted;
1294         int len_decrypted, res;
1295         size_t buf_len;
1296
1297         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1298                    " Phase 2", (unsigned long) in_len);
1299
1300         if (data->pending_phase2_resp) {
1301                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1302                            "skip decryption and use old data");
1303                 eap_fast_process_phase2_tlvs(
1304                         sm, data, wpabuf_mhead(data->pending_phase2_resp),
1305                         wpabuf_len(data->pending_phase2_resp));
1306                 wpabuf_free(data->pending_phase2_resp);
1307                 data->pending_phase2_resp = NULL;
1308                 return;
1309         }
1310
1311         /* FIX: get rid of const -> non-const typecast */
1312         res = eap_server_tls_data_reassemble(sm, &data->ssl, (u8 **) &in_data,
1313                                              &in_len);
1314         if (res < 0 || res == 1)
1315                 return;
1316
1317         buf_len = in_len;
1318         if (data->ssl.tls_in_total > buf_len)
1319                 buf_len = data->ssl.tls_in_total;
1320         in_decrypted = os_malloc(buf_len);
1321         if (in_decrypted == NULL) {
1322                 os_free(data->ssl.tls_in);
1323                 data->ssl.tls_in = NULL;
1324                 data->ssl.tls_in_len = 0;
1325                 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
1326                            "for decryption");
1327                 return;
1328         }
1329
1330         len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1331                                                in_data, in_len,
1332                                                in_decrypted, buf_len);
1333         os_free(data->ssl.tls_in);
1334         data->ssl.tls_in = NULL;
1335         data->ssl.tls_in_len = 0;
1336         if (len_decrypted < 0) {
1337                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1338                            "data");
1339                 os_free(in_decrypted);
1340                 eap_fast_state(data, FAILURE);
1341                 return;
1342         }
1343
1344         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1345                         in_decrypted, len_decrypted);
1346
1347         eap_fast_process_phase2_tlvs(sm, data, in_decrypted, len_decrypted);
1348
1349         if (sm->method_pending == METHOD_PENDING_WAIT) {
1350                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1351                            "pending wait state - save decrypted response");
1352                 wpabuf_free(data->pending_phase2_resp);
1353                 data->pending_phase2_resp = wpabuf_alloc_copy(in_decrypted,
1354                                                               len_decrypted);
1355         }
1356
1357         os_free(in_decrypted);
1358 }
1359
1360
1361 static int eap_fast_process_version(struct eap_fast_data *data,
1362                                     int peer_version)
1363 {
1364         data->peer_version = peer_version;
1365
1366         if (data->force_version >= 0 && peer_version != data->force_version) {
1367                 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1368                            " version (forced=%d peer=%d) - reject",
1369                            data->force_version, peer_version);
1370                 eap_fast_state(data, FAILURE);
1371                 return -1;
1372         }
1373
1374         if (peer_version < data->fast_version) {
1375                 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1376                            "use version %d",
1377                            peer_version, data->fast_version, peer_version);
1378                 data->fast_version = peer_version;
1379         }
1380
1381         return 0;
1382 }
1383
1384
1385 static int eap_fast_process_length(struct eap_fast_data *data,
1386                                    const u8 **pos, size_t *left)
1387 {
1388         u32 tls_msg_len;
1389
1390         if (*left < 4) {
1391                 wpa_printf(MSG_INFO, "EAP-FAST: Short frame with TLS "
1392                            "length");
1393                 eap_fast_state(data, FAILURE);
1394                 return -1;
1395         }
1396
1397         tls_msg_len = WPA_GET_BE32(*pos);
1398         wpa_printf(MSG_DEBUG, "EAP-FAST: TLS Message Length: %d",
1399                    tls_msg_len);
1400
1401         if (data->ssl.tls_in_left == 0) {
1402                 data->ssl.tls_in_total = tls_msg_len;
1403                 data->ssl.tls_in_left = tls_msg_len;
1404                 os_free(data->ssl.tls_in);
1405                 data->ssl.tls_in = NULL;
1406                 data->ssl.tls_in_len = 0;
1407         }
1408
1409         *pos += 4;
1410         *left -= 4;
1411
1412         return 0;
1413 }
1414
1415
1416 static int eap_fast_process_phase1(struct eap_sm *sm,
1417                                    struct eap_fast_data *data,
1418                                    const u8 *pos, size_t left)
1419 {
1420         if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
1421                 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1422                 eap_fast_state(data, FAILURE);
1423                 return -1;
1424         }
1425
1426         if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1427             data->ssl.tls_out_len > 0)
1428                 return 1;
1429
1430         /*
1431          * Phase 1 was completed with the received message (e.g., when using
1432          * abbreviated handshake), so Phase 2 can be started immediately
1433          * without having to send through an empty message to the peer.
1434          */
1435
1436         return eap_fast_phase1_done(sm, data);
1437 }
1438
1439
1440 static void eap_fast_process_phase2_start(struct eap_sm *sm,
1441                                           struct eap_fast_data *data)
1442 {
1443         u8 next_type;
1444
1445         if (data->identity) {
1446                 os_free(sm->identity);
1447                 sm->identity = data->identity;
1448                 data->identity = NULL;
1449                 sm->identity_len = data->identity_len;
1450                 data->identity_len = 0;
1451                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1452                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1453                                           "Phase2 Identity not found "
1454                                           "in the user database",
1455                                           sm->identity, sm->identity_len);
1456                         next_type = eap_fast_req_failure(sm, data);
1457                 } else {
1458                         wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1459                                    "known - skip Phase 2 Identity Request");
1460                         next_type = sm->user->methods[0].method;
1461                         sm->user_eap_method_index = 1;
1462                 }
1463
1464                 eap_fast_state(data, PHASE2_METHOD);
1465         } else {
1466                 eap_fast_state(data, PHASE2_ID);
1467                 next_type = EAP_TYPE_IDENTITY;
1468         }
1469
1470         eap_fast_phase2_init(sm, data, next_type);
1471 }
1472
1473
1474 static void eap_fast_process(struct eap_sm *sm, void *priv,
1475                              struct wpabuf *respData)
1476 {
1477         struct eap_fast_data *data = priv;
1478         const u8 *pos;
1479         u8 flags;
1480         size_t left;
1481
1482         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData,
1483                                &left);
1484         if (pos == NULL || left < 1)
1485                 return;
1486         flags = *pos++;
1487         left--;
1488         wpa_printf(MSG_DEBUG, "EAP-FAST: Received packet(len=%lu) - "
1489                    "Flags 0x%02x", (unsigned long) wpabuf_len(respData),
1490                    flags);
1491
1492         if (eap_fast_process_version(data, flags & EAP_PEAP_VERSION_MASK))
1493                 return;
1494
1495         if ((flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) &&
1496             eap_fast_process_length(data, &pos, &left))
1497                 return;
1498
1499         switch (data->state) {
1500         case PHASE1:
1501                 if (eap_fast_process_phase1(sm, data, pos, left))
1502                         break;
1503
1504                 /* fall through to PHASE2_START */
1505         case PHASE2_START:
1506                 eap_fast_process_phase2_start(sm, data);
1507                 break;
1508         case PHASE2_ID:
1509         case PHASE2_METHOD:
1510         case CRYPTO_BINDING:
1511         case REQUEST_PAC:
1512                 eap_fast_process_phase2(sm, data, pos, left);
1513                 break;
1514         default:
1515                 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1516                            data->state, __func__);
1517                 break;
1518         }
1519
1520         if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
1521                 wpa_printf(MSG_INFO, "EAP-FAST: Locally detected fatal error "
1522                            "in TLS processing");
1523                 eap_fast_state(data, FAILURE);
1524         }
1525 }
1526
1527
1528 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1529 {
1530         struct eap_fast_data *data = priv;
1531         return data->state == SUCCESS || data->state == FAILURE;
1532 }
1533
1534
1535 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1536 {
1537         struct eap_fast_data *data = priv;
1538         u8 *eapKeyData;
1539
1540         if (data->state != SUCCESS)
1541                 return NULL;
1542
1543         eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1544         if (eapKeyData == NULL)
1545                 return NULL;
1546
1547         eap_fast_derive_eap_msk(data->simck, eapKeyData);
1548         *len = EAP_FAST_KEY_LEN;
1549
1550         return eapKeyData;
1551 }
1552
1553
1554 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1555 {
1556         struct eap_fast_data *data = priv;
1557         u8 *eapKeyData;
1558
1559         if (data->state != SUCCESS)
1560                 return NULL;
1561
1562         eapKeyData = os_malloc(EAP_EMSK_LEN);
1563         if (eapKeyData == NULL)
1564                 return NULL;
1565
1566         eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1567         *len = EAP_EMSK_LEN;
1568
1569         return eapKeyData;
1570 }
1571
1572
1573 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1574 {
1575         struct eap_fast_data *data = priv;
1576         return data->state == SUCCESS;
1577 }
1578
1579
1580 int eap_server_fast_register(void)
1581 {
1582         struct eap_method *eap;
1583         int ret;
1584
1585         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1586                                       EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1587         if (eap == NULL)
1588                 return -1;
1589
1590         eap->init = eap_fast_init;
1591         eap->reset = eap_fast_reset;
1592         eap->buildReq = eap_fast_buildReq;
1593         eap->check = eap_fast_check;
1594         eap->process = eap_fast_process;
1595         eap->isDone = eap_fast_isDone;
1596         eap->getKey = eap_fast_getKey;
1597         eap->get_emsk = eap_fast_get_emsk;
1598         eap->isSuccess = eap_fast_isSuccess;
1599
1600         ret = eap_server_method_register(eap);
1601         if (ret)
1602                 eap_server_method_free(eap);
1603         return ret;
1604 }