src/ap/wpa_auth.c

   1 /*
   2  * IEEE 802.11 RSN / WPA Authenticator
   3  * Copyright (c) 2004-2011, 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 "utils/includes.h"
  16
  17 #include "utils/common.h"
  18 #include "utils/eloop.h"
  19 #include "utils/state_machine.h"
  20 #include "common/ieee802_11_defs.h"
  21 #include "crypto/aes_wrap.h"
  22 #include "crypto/crypto.h"
  23 #include "crypto/sha1.h"
  24 #include "crypto/sha256.h"
  25 #include "crypto/random.h"
  26 #include "eapol_auth/eapol_auth_sm.h"
  27 #include "ap_config.h"
  28 #include "ieee802_11.h"
  29 #include "wpa_auth.h"
  30 #include "pmksa_cache_auth.h"
  31 #include "wpa_auth_i.h"
  32 #include "wpa_auth_ie.h"
  33
  34 #define STATE_MACHINE_DATA struct wpa_state_machine
  35 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
  36 #define STATE_MACHINE_ADDR sm->addr
  37
  38
  39 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
  40 static int wpa_sm_step(struct wpa_state_machine *sm);
  41 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
  42 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
  43 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
  44                               struct wpa_group *group);
  45 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
  46 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
  47                           struct wpa_group *group);
  48 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
  49                                        struct wpa_group *group);
  50
  51 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
  52 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
  53 static const u32 eapol_key_timeout_first = 100; /* ms */
  54 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
  55 static const u32 eapol_key_timeout_first_group = 500; /* ms */
  56
  57 /* TODO: make these configurable */
  58 static const int dot11RSNAConfigPMKLifetime = 43200;
  59 static const int dot11RSNAConfigPMKReauthThreshold = 70;
  60 static const int dot11RSNAConfigSATimeout = 60;
  61
  62
  63 static inline void wpa_auth_mic_failure_report(
  64         struct wpa_authenticator *wpa_auth, const u8 *addr)
  65 {
  66         if (wpa_auth->cb.mic_failure_report)
  67                 wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
  68 }
  69
  70
  71 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
  72                                       const u8 *addr, wpa_eapol_variable var,
  73                                       int value)
  74 {
  75         if (wpa_auth->cb.set_eapol)
  76                 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
  77 }
  78
  79
  80 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
  81                                      const u8 *addr, wpa_eapol_variable var)
  82 {
  83         if (wpa_auth->cb.get_eapol == NULL)
  84                 return -1;
  85         return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
  86 }
  87
  88
  89 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
  90                                           const u8 *addr, const u8 *prev_psk)
  91 {
  92         if (wpa_auth->cb.get_psk == NULL)
  93                 return NULL;
  94         return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
  95 }
  96
  97
  98 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
  99                                    const u8 *addr, u8 *msk, size_t *len)
 100 {
 101         if (wpa_auth->cb.get_msk == NULL)
 102                 return -1;
 103         return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
 104 }
 105
 106
 107 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
 108                                    int vlan_id,
 109                                    enum wpa_alg alg, const u8 *addr, int idx,
 110                                    u8 *key, size_t key_len)
 111 {
 112         if (wpa_auth->cb.set_key == NULL)
 113                 return -1;
 114         return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
 115                                     key, key_len);
 116 }
 117
 118
 119 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
 120                                       const u8 *addr, int idx, u8 *seq)
 121 {
 122         if (wpa_auth->cb.get_seqnum == NULL)
 123                 return -1;
 124         return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
 125 }
 126
 127
 128 static inline int
 129 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
 130                     const u8 *data, size_t data_len, int encrypt)
 131 {
 132         if (wpa_auth->cb.send_eapol == NULL)
 133                 return -1;
 134         return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
 135                                        encrypt);
 136 }
 137
 138
 139 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
 140                           int (*cb)(struct wpa_state_machine *sm, void *ctx),
 141                           void *cb_ctx)
 142 {
 143         if (wpa_auth->cb.for_each_sta == NULL)
 144                 return 0;
 145         return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
 146 }
 147
 148
 149 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
 150                            int (*cb)(struct wpa_authenticator *a, void *ctx),
 151                            void *cb_ctx)
 152 {
 153         if (wpa_auth->cb.for_each_auth == NULL)
 154                 return 0;
 155         return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
 156 }
 157
 158
 159 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
 160                      logger_level level, const char *txt)
 161 {
 162         if (wpa_auth->cb.logger == NULL)
 163                 return;
 164         wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
 165 }
 166
 167
 168 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
 169                       logger_level level, const char *fmt, ...)
 170 {
 171         char *format;
 172         int maxlen;
 173         va_list ap;
 174
 175         if (wpa_auth->cb.logger == NULL)
 176                 return;
 177
 178         maxlen = os_strlen(fmt) + 100;
 179         format = os_malloc(maxlen);
 180         if (!format)
 181                 return;
 182
 183         va_start(ap, fmt);
 184         vsnprintf(format, maxlen, fmt, ap);
 185         va_end(ap);
 186
 187         wpa_auth_logger(wpa_auth, addr, level, format);
 188
 189         os_free(format);
 190 }
 191
 192
 193 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
 194                                const u8 *addr)
 195 {
 196         if (wpa_auth->cb.disconnect == NULL)
 197                 return;
 198         wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
 199         wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
 200                                 WLAN_REASON_PREV_AUTH_NOT_VALID);
 201 }
 202
 203
 204 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
 205 {
 206         int ret = 0;
 207 #ifdef CONFIG_IEEE80211R
 208         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
 209                 ret = 1;
 210 #endif /* CONFIG_IEEE80211R */
 211 #ifdef CONFIG_IEEE80211W
 212         if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
 213                 ret = 1;
 214 #endif /* CONFIG_IEEE80211W */
 215         return ret;
 216 }
 217
 218
 219 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
 220 {
 221         struct wpa_authenticator *wpa_auth = eloop_ctx;
 222
 223         if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
 224                 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
 225                            "initialization.");
 226         } else {
 227                 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
 228                 wpa_hexdump_key(MSG_DEBUG, "GMK",
 229                                 wpa_auth->group->GMK, WPA_GMK_LEN);
 230         }
 231
 232         if (wpa_auth->conf.wpa_gmk_rekey) {
 233                 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
 234                                        wpa_rekey_gmk, wpa_auth, NULL);
 235         }
 236 }
 237
 238
 239 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
 240 {
 241         struct wpa_authenticator *wpa_auth = eloop_ctx;
 242         struct wpa_group *group;
 243
 244         wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
 245         for (group = wpa_auth->group; group; group = group->next) {
 246                 group->GTKReKey = TRUE;
 247                 do {
 248                         group->changed = FALSE;
 249                         wpa_group_sm_step(wpa_auth, group);
 250                 } while (group->changed);
 251         }
 252
 253         if (wpa_auth->conf.wpa_group_rekey) {
 254                 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
 255                                        0, wpa_rekey_gtk, wpa_auth, NULL);
 256         }
 257 }
 258
 259
 260 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
 261 {
 262         struct wpa_authenticator *wpa_auth = eloop_ctx;
 263         struct wpa_state_machine *sm = timeout_ctx;
 264
 265         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
 266         wpa_request_new_ptk(sm);
 267         wpa_sm_step(sm);
 268 }
 269
 270
 271 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
 272 {
 273         if (sm->pmksa == ctx)
 274                 sm->pmksa = NULL;
 275         return 0;
 276 }
 277
 278
 279 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
 280                                    void *ctx)
 281 {
 282         struct wpa_authenticator *wpa_auth = ctx;
 283         wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
 284 }
 285
 286
 287 static void wpa_group_set_key_len(struct wpa_group *group, int cipher)
 288 {
 289         switch (cipher) {
 290         case WPA_CIPHER_CCMP:
 291                 group->GTK_len = 16;
 292                 break;
 293         case WPA_CIPHER_TKIP:
 294                 group->GTK_len = 32;
 295                 break;
 296         case WPA_CIPHER_WEP104:
 297                 group->GTK_len = 13;
 298                 break;
 299         case WPA_CIPHER_WEP40:
 300                 group->GTK_len = 5;
 301                 break;
 302         }
 303 }
 304
 305
 306 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
 307                                           struct wpa_group *group)
 308 {
 309         u8 buf[ETH_ALEN + 8 + sizeof(group)];
 310         u8 rkey[32];
 311
 312         if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
 313                 return -1;
 314         wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
 315
 316         /*
 317          * Counter = PRF-256(Random number, "Init Counter",
 318          *                   Local MAC Address || Time)
 319          */
 320         os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
 321         wpa_get_ntp_timestamp(buf + ETH_ALEN);
 322         os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group));
 323         if (random_get_bytes(rkey, sizeof(rkey)) < 0)
 324                 return -1;
 325
 326         if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
 327                      group->Counter, WPA_NONCE_LEN) < 0)
 328                 return -1;
 329         wpa_hexdump_key(MSG_DEBUG, "Key Counter",
 330                         group->Counter, WPA_NONCE_LEN);
 331
 332         return 0;
 333 }
 334
 335
 336 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
 337                                          int vlan_id, int delay_init)
 338 {
 339         struct wpa_group *group;
 340
 341         group = os_zalloc(sizeof(struct wpa_group));
 342         if (group == NULL)
 343                 return NULL;
 344
 345         group->GTKAuthenticator = TRUE;
 346         group->vlan_id = vlan_id;
 347
 348         wpa_group_set_key_len(group, wpa_auth->conf.wpa_group);
 349
 350         if (random_pool_ready() != 1) {
 351                 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
 352                            "for secure operations - update keys later when "
 353                            "the first station connects");
 354         }
 355
 356         /*
 357          * Set initial GMK/Counter value here. The actual values that will be
 358          * used in negotiations will be set once the first station tries to
 359          * connect. This allows more time for collecting additional randomness
 360          * on embedded devices.
 361          */
 362         if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
 363                 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
 364                            "initialization.");
 365                 os_free(group);
 366                 return NULL;
 367         }
 368
 369         group->GInit = TRUE;
 370         if (delay_init) {
 371                 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
 372                            "until Beacon frames have been configured");
 373                 /* Initialization is completed in wpa_init_keys(). */
 374         } else {
 375                 wpa_group_sm_step(wpa_auth, group);
 376                 group->GInit = FALSE;
 377                 wpa_group_sm_step(wpa_auth, group);
 378         }
 379
 380         return group;
 381 }
 382
 383
 384 /**
 385  * wpa_init - Initialize WPA authenticator
 386  * @addr: Authenticator address
 387  * @conf: Configuration for WPA authenticator
 388  * @cb: Callback functions for WPA authenticator
 389  * Returns: Pointer to WPA authenticator data or %NULL on failure
 390  */
 391 struct wpa_authenticator * wpa_init(const u8 *addr,
 392                                     struct wpa_auth_config *conf,
 393                                     struct wpa_auth_callbacks *cb)
 394 {
 395         struct wpa_authenticator *wpa_auth;
 396
 397         wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
 398         if (wpa_auth == NULL)
 399                 return NULL;
 400         os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
 401         os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
 402         os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
 403
 404         if (wpa_auth_gen_wpa_ie(wpa_auth)) {
 405                 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
 406                 os_free(wpa_auth);
 407                 return NULL;
 408         }
 409
 410         wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
 411         if (wpa_auth->group == NULL) {
 412                 os_free(wpa_auth->wpa_ie);
 413                 os_free(wpa_auth);
 414                 return NULL;
 415         }
 416
 417         wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
 418                                                 wpa_auth);
 419         if (wpa_auth->pmksa == NULL) {
 420                 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
 421                 os_free(wpa_auth->wpa_ie);
 422                 os_free(wpa_auth);
 423                 return NULL;
 424         }
 425
 426 #ifdef CONFIG_IEEE80211R
 427         wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
 428         if (wpa_auth->ft_pmk_cache == NULL) {
 429                 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
 430                 os_free(wpa_auth->wpa_ie);
 431                 pmksa_cache_auth_deinit(wpa_auth->pmksa);
 432                 os_free(wpa_auth);
 433                 return NULL;
 434         }
 435 #endif /* CONFIG_IEEE80211R */
 436
 437         if (wpa_auth->conf.wpa_gmk_rekey) {
 438                 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
 439                                        wpa_rekey_gmk, wpa_auth, NULL);
 440         }
 441
 442         if (wpa_auth->conf.wpa_group_rekey) {
 443                 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
 444                                        wpa_rekey_gtk, wpa_auth, NULL);
 445         }
 446
 447         return wpa_auth;
 448 }
 449
 450
 451 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
 452 {
 453         struct wpa_group *group = wpa_auth->group;
 454
 455         wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
 456                    "keys");
 457         wpa_group_sm_step(wpa_auth, group);
 458         group->GInit = FALSE;
 459         wpa_group_sm_step(wpa_auth, group);
 460         return 0;
 461 }
 462
 463
 464 /**
 465  * wpa_deinit - Deinitialize WPA authenticator
 466  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
 467  */
 468 void wpa_deinit(struct wpa_authenticator *wpa_auth)
 469 {
 470         struct wpa_group *group, *prev;
 471
 472         eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
 473         eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
 474
 475 #ifdef CONFIG_PEERKEY
 476         while (wpa_auth->stsl_negotiations)
 477                 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
 478 #endif /* CONFIG_PEERKEY */
 479
 480         pmksa_cache_auth_deinit(wpa_auth->pmksa);
 481
 482 #ifdef CONFIG_IEEE80211R
 483         wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
 484         wpa_auth->ft_pmk_cache = NULL;
 485 #endif /* CONFIG_IEEE80211R */
 486
 487         os_free(wpa_auth->wpa_ie);
 488
 489         group = wpa_auth->group;
 490         while (group) {
 491                 prev = group;
 492                 group = group->next;
 493                 os_free(prev);
 494         }
 495
 496         os_free(wpa_auth);
 497 }
 498
 499
 500 /**
 501  * wpa_reconfig - Update WPA authenticator configuration
 502  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
 503  * @conf: Configuration for WPA authenticator
 504  */
 505 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
 506                  struct wpa_auth_config *conf)
 507 {
 508         struct wpa_group *group;
 509         if (wpa_auth == NULL)
 510                 return 0;
 511
 512         os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
 513         if (wpa_auth_gen_wpa_ie(wpa_auth)) {
 514                 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
 515                 return -1;
 516         }
 517
 518         /*
 519          * Reinitialize GTK to make sure it is suitable for the new
 520          * configuration.
 521          */
 522         group = wpa_auth->group;
 523         wpa_group_set_key_len(group, wpa_auth->conf.wpa_group);
 524         group->GInit = TRUE;
 525         wpa_group_sm_step(wpa_auth, group);
 526         group->GInit = FALSE;
 527         wpa_group_sm_step(wpa_auth, group);
 528
 529         return 0;
 530 }
 531
 532
 533 struct wpa_state_machine *
 534 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
 535 {
 536         struct wpa_state_machine *sm;
 537
 538         sm = os_zalloc(sizeof(struct wpa_state_machine));
 539         if (sm == NULL)
 540                 return NULL;
 541         os_memcpy(sm->addr, addr, ETH_ALEN);
 542
 543         sm->wpa_auth = wpa_auth;
 544         sm->group = wpa_auth->group;
 545
 546         return sm;
 547 }
 548
 549
 550 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
 551                             struct wpa_state_machine *sm)
 552 {
 553         if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
 554                 return -1;
 555
 556 #ifdef CONFIG_IEEE80211R
 557         if (sm->ft_completed) {
 558                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
 559                                 "FT authentication already completed - do not "
 560                                 "start 4-way handshake");
 561                 return 0;
 562         }
 563 #endif /* CONFIG_IEEE80211R */
 564
 565         if (sm->started) {
 566                 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
 567                 sm->ReAuthenticationRequest = TRUE;
 568                 return wpa_sm_step(sm);
 569         }
 570
 571         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
 572                         "start authentication");
 573         sm->started = 1;
 574
 575         sm->Init = TRUE;
 576         if (wpa_sm_step(sm) == 1)
 577                 return 1; /* should not really happen */
 578         sm->Init = FALSE;
 579         sm->AuthenticationRequest = TRUE;
 580         return wpa_sm_step(sm);
 581 }
 582
 583
 584 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
 585 {
 586         /* WPA/RSN was not used - clear WPA state. This is needed if the STA
 587          * reassociates back to the same AP while the previous entry for the
 588          * STA has not yet been removed. */
 589         if (sm == NULL)
 590                 return;
 591
 592         sm->wpa_key_mgmt = 0;
 593 }
 594
 595
 596 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
 597 {
 598         if (sm->GUpdateStationKeys) {
 599                 sm->group->GKeyDoneStations--;
 600                 sm->GUpdateStationKeys = FALSE;
 601         }
 602 #ifdef CONFIG_IEEE80211R
 603         os_free(sm->assoc_resp_ftie);
 604 #endif /* CONFIG_IEEE80211R */
 605         os_free(sm->last_rx_eapol_key);
 606         os_free(sm->wpa_ie);
 607         os_free(sm);
 608 }
 609
 610
 611 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
 612 {
 613         if (sm == NULL)
 614                 return;
 615
 616         if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
 617                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
 618                                 "strict rekeying - force GTK rekey since STA "
 619                                 "is leaving");
 620                 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
 621                 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
 622                                        NULL);
 623         }
 624
 625         eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
 626         sm->pending_1_of_4_timeout = 0;
 627         eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
 628         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
 629         if (sm->in_step_loop) {
 630                 /* Must not free state machine while wpa_sm_step() is running.
 631                  * Freeing will be completed in the end of wpa_sm_step(). */
 632                 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
 633                            "machine deinit for " MACSTR, MAC2STR(sm->addr));
 634                 sm->pending_deinit = 1;
 635         } else
 636                 wpa_free_sta_sm(sm);
 637 }
 638
 639
 640 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
 641 {
 642         if (sm == NULL)
 643                 return;
 644
 645         sm->PTKRequest = TRUE;
 646         sm->PTK_valid = 0;
 647 }
 648
 649
 650 static int wpa_replay_counter_valid(struct wpa_state_machine *sm,
 651                                     const u8 *replay_counter)
 652 {
 653         int i;
 654         for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
 655                 if (!sm->key_replay[i].valid)
 656                         break;
 657                 if (os_memcmp(replay_counter, sm->key_replay[i].counter,
 658                               WPA_REPLAY_COUNTER_LEN) == 0)
 659                         return 1;
 660         }
 661         return 0;
 662 }
 663
 664
 665 #ifdef CONFIG_IEEE80211R
 666 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
 667                                struct wpa_state_machine *sm,
 668                                struct wpa_eapol_ie_parse *kde)
 669 {
 670         struct wpa_ie_data ie;
 671         struct rsn_mdie *mdie;
 672
 673         if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
 674             ie.num_pmkid != 1 || ie.pmkid == NULL) {
 675                 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
 676                            "FT 4-way handshake message 2/4");
 677                 return -1;
 678         }
 679
 680         os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
 681         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
 682                     sm->sup_pmk_r1_name, PMKID_LEN);
 683
 684         if (!kde->mdie || !kde->ftie) {
 685                 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
 686                            "message 2/4", kde->mdie ? "FTIE" : "MDIE");
 687                 return -1;
 688         }
 689
 690         mdie = (struct rsn_mdie *) (kde->mdie + 2);
 691         if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
 692             os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
 693                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 694                 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
 695                 return -1;
 696         }
 697
 698         if (sm->assoc_resp_ftie &&
 699             (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
 700              os_memcmp(kde->ftie, sm->assoc_resp_ftie,
 701                        2 + sm->assoc_resp_ftie[1]) != 0)) {
 702                 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
 703                 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
 704                             kde->ftie, kde->ftie_len);
 705                 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
 706                             sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
 707                 return -1;
 708         }
 709
 710         return 0;
 711 }
 712 #endif /* CONFIG_IEEE80211R */
 713
 714
 715 static void wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
 716                                      struct wpa_state_machine *sm, int group)
 717 {
 718         /* Supplicant reported a Michael MIC error */
 719         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 720                          "received EAPOL-Key Error Request "
 721                          "(STA detected Michael MIC failure (group=%d))",
 722                          group);
 723
 724         if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
 725                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 726                                 "ignore Michael MIC failure report since "
 727                                 "group cipher is not TKIP");
 728         } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
 729                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 730                                 "ignore Michael MIC failure report since "
 731                                 "pairwise cipher is not TKIP");
 732         } else {
 733                 wpa_auth_mic_failure_report(wpa_auth, sm->addr);
 734                 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
 735                 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
 736         }
 737
 738         /*
 739          * Error report is not a request for a new key handshake, but since
 740          * Authenticator may do it, let's change the keys now anyway.
 741          */
 742         wpa_request_new_ptk(sm);
 743 }
 744
 745
 746 void wpa_receive(struct wpa_authenticator *wpa_auth,
 747                  struct wpa_state_machine *sm,
 748                  u8 *data, size_t data_len)
 749 {
 750         struct ieee802_1x_hdr *hdr;
 751         struct wpa_eapol_key *key;
 752         u16 key_info, key_data_length;
 753         enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
 754                SMK_M1, SMK_M3, SMK_ERROR } msg;
 755         char *msgtxt;
 756         struct wpa_eapol_ie_parse kde;
 757         int ft;
 758         const u8 *eapol_key_ie;
 759         size_t eapol_key_ie_len;
 760
 761         if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
 762                 return;
 763
 764         if (data_len < sizeof(*hdr) + sizeof(*key))
 765                 return;
 766
 767         hdr = (struct ieee802_1x_hdr *) data;
 768         key = (struct wpa_eapol_key *) (hdr + 1);
 769         key_info = WPA_GET_BE16(key->key_info);
 770         key_data_length = WPA_GET_BE16(key->key_data_length);
 771         wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
 772                    " key_info=0x%x type=%u key_data_length=%u",
 773                    MAC2STR(sm->addr), key_info, key->type, key_data_length);
 774         if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
 775                 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
 776                            "key_data overflow (%d > %lu)",
 777                            key_data_length,
 778                            (unsigned long) (data_len - sizeof(*hdr) -
 779                                             sizeof(*key)));
 780                 return;
 781         }
 782
 783         if (sm->wpa == WPA_VERSION_WPA2) {
 784                 if (key->type != EAPOL_KEY_TYPE_RSN) {
 785                         wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
 786                                    "unexpected type %d in RSN mode",
 787                                    key->type);
 788                         return;
 789                 }
 790         } else {
 791                 if (key->type != EAPOL_KEY_TYPE_WPA) {
 792                         wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
 793                                    "unexpected type %d in WPA mode",
 794                                    key->type);
 795                         return;
 796                 }
 797         }
 798
 799         wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
 800                     WPA_NONCE_LEN);
 801         wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
 802                     key->replay_counter, WPA_REPLAY_COUNTER_LEN);
 803
 804         /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
 805          * are set */
 806
 807         if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
 808             (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
 809                 if (key_info & WPA_KEY_INFO_ERROR) {
 810                         msg = SMK_ERROR;
 811                         msgtxt = "SMK Error";
 812                 } else {
 813                         msg = SMK_M1;
 814                         msgtxt = "SMK M1";
 815                 }
 816         } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
 817                 msg = SMK_M3;
 818                 msgtxt = "SMK M3";
 819         } else if (key_info & WPA_KEY_INFO_REQUEST) {
 820                 msg = REQUEST;
 821                 msgtxt = "Request";
 822         } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
 823                 msg = GROUP_2;
 824                 msgtxt = "2/2 Group";
 825         } else if (key_data_length == 0) {
 826                 msg = PAIRWISE_4;
 827                 msgtxt = "4/4 Pairwise";
 828         } else {
 829                 msg = PAIRWISE_2;
 830                 msgtxt = "2/4 Pairwise";
 831         }
 832
 833         /* TODO: key_info type validation for PeerKey */
 834         if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
 835             msg == GROUP_2) {
 836                 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
 837                 if (sm->pairwise == WPA_CIPHER_CCMP) {
 838                         if (wpa_use_aes_cmac(sm) &&
 839                             ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
 840                                 wpa_auth_logger(wpa_auth, sm->addr,
 841                                                 LOGGER_WARNING,
 842                                                 "advertised support for "
 843                                                 "AES-128-CMAC, but did not "
 844                                                 "use it");
 845                                 return;
 846                         }
 847
 848                         if (!wpa_use_aes_cmac(sm) &&
 849                             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
 850                                 wpa_auth_logger(wpa_auth, sm->addr,
 851                                                 LOGGER_WARNING,
 852                                                 "did not use HMAC-SHA1-AES "
 853                                                 "with CCMP");
 854                                 return;
 855                         }
 856                 }
 857         }
 858
 859         if (key_info & WPA_KEY_INFO_REQUEST) {
 860                 if (sm->req_replay_counter_used &&
 861                     os_memcmp(key->replay_counter, sm->req_replay_counter,
 862                               WPA_REPLAY_COUNTER_LEN) <= 0) {
 863                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
 864                                         "received EAPOL-Key request with "
 865                                         "replayed counter");
 866                         return;
 867                 }
 868         }
 869
 870         if (!(key_info & WPA_KEY_INFO_REQUEST) &&
 871             !wpa_replay_counter_valid(sm, key->replay_counter)) {
 872                 int i;
 873                 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
 874                                  "received EAPOL-Key %s with unexpected "
 875                                  "replay counter", msgtxt);
 876                 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
 877                         if (!sm->key_replay[i].valid)
 878                                 break;
 879                         wpa_hexdump(MSG_DEBUG, "pending replay counter",
 880                                     sm->key_replay[i].counter,
 881                                     WPA_REPLAY_COUNTER_LEN);
 882                 }
 883                 wpa_hexdump(MSG_DEBUG, "received replay counter",
 884                             key->replay_counter, WPA_REPLAY_COUNTER_LEN);
 885                 return;
 886         }
 887
 888         switch (msg) {
 889         case PAIRWISE_2:
 890                 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
 891                     sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING) {
 892                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 893                                          "received EAPOL-Key msg 2/4 in "
 894                                          "invalid state (%d) - dropped",
 895                                          sm->wpa_ptk_state);
 896                         return;
 897                 }
 898                 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
 899                 if (sm->group->reject_4way_hs_for_entropy) {
 900                         /*
 901                          * The system did not have enough entropy to generate
 902                          * strong random numbers. Reject the first 4-way
 903                          * handshake(s) and collect some entropy based on the
 904                          * information from it. Once enough entropy is
 905                          * available, the next atempt will trigger GMK/Key
 906                          * Counter update and the station will be allowed to
 907                          * continue.
 908                          */
 909                         wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
 910                                    "collect more entropy for random number "
 911                                    "generation");
 912                         sm->group->reject_4way_hs_for_entropy = FALSE;
 913                         random_mark_pool_ready();
 914                         sm->group->first_sta_seen = FALSE;
 915                         wpa_sta_disconnect(wpa_auth, sm->addr);
 916                         return;
 917                 }
 918                 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
 919                                       &kde) < 0) {
 920                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 921                                          "received EAPOL-Key msg 2/4 with "
 922                                          "invalid Key Data contents");
 923                         return;
 924                 }
 925                 if (kde.rsn_ie) {
 926                         eapol_key_ie = kde.rsn_ie;
 927                         eapol_key_ie_len = kde.rsn_ie_len;
 928                 } else {
 929                         eapol_key_ie = kde.wpa_ie;
 930                         eapol_key_ie_len = kde.wpa_ie_len;
 931                 }
 932                 ft = sm->wpa == WPA_VERSION_WPA2 &&
 933                         wpa_key_mgmt_ft(sm->wpa_key_mgmt);
 934                 if (sm->wpa_ie == NULL ||
 935                     wpa_compare_rsn_ie(ft,
 936                                        sm->wpa_ie, sm->wpa_ie_len,
 937                                        eapol_key_ie, eapol_key_ie_len)) {
 938                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 939                                         "WPA IE from (Re)AssocReq did not "
 940                                         "match with msg 2/4");
 941                         if (sm->wpa_ie) {
 942                                 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
 943                                             sm->wpa_ie, sm->wpa_ie_len);
 944                         }
 945                         wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
 946                                     eapol_key_ie, eapol_key_ie_len);
 947                         /* MLME-DEAUTHENTICATE.request */
 948                         wpa_sta_disconnect(wpa_auth, sm->addr);
 949                         return;
 950                 }
 951 #ifdef CONFIG_IEEE80211R
 952                 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
 953                         wpa_sta_disconnect(wpa_auth, sm->addr);
 954                         return;
 955                 }
 956 #endif /* CONFIG_IEEE80211R */
 957                 break;
 958         case PAIRWISE_4:
 959                 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
 960                     !sm->PTK_valid) {
 961                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 962                                          "received EAPOL-Key msg 4/4 in "
 963                                          "invalid state (%d) - dropped",
 964                                          sm->wpa_ptk_state);
 965                         return;
 966                 }
 967                 break;
 968         case GROUP_2:
 969                 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
 970                     || !sm->PTK_valid) {
 971                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 972                                          "received EAPOL-Key msg 2/2 in "
 973                                          "invalid state (%d) - dropped",
 974                                          sm->wpa_ptk_group_state);
 975                         return;
 976                 }
 977                 break;
 978 #ifdef CONFIG_PEERKEY
 979         case SMK_M1:
 980         case SMK_M3:
 981         case SMK_ERROR:
 982                 if (!wpa_auth->conf.peerkey) {
 983                         wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
 984                                    "PeerKey use disabled - ignoring message");
 985                         return;
 986                 }
 987                 if (!sm->PTK_valid) {
 988                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 989                                         "received EAPOL-Key msg SMK in "
 990                                         "invalid state - dropped");
 991                         return;
 992                 }
 993                 break;
 994 #else /* CONFIG_PEERKEY */
 995         case SMK_M1:
 996         case SMK_M3:
 997         case SMK_ERROR:
 998                 return; /* STSL disabled - ignore SMK messages */
 999 #endif /* CONFIG_PEERKEY */
1000         case REQUEST:
1001                 break;
1002         }
1003
1004         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1005                          "received EAPOL-Key frame (%s)", msgtxt);
1006
1007         if (key_info & WPA_KEY_INFO_ACK) {
1008                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1009                                 "received invalid EAPOL-Key: Key Ack set");
1010                 return;
1011         }
1012
1013         if (!(key_info & WPA_KEY_INFO_MIC)) {
1014                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1015                                 "received invalid EAPOL-Key: Key MIC not set");
1016                 return;
1017         }
1018
1019         sm->MICVerified = FALSE;
1020         if (sm->PTK_valid) {
1021                 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1022                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1023                                         "received EAPOL-Key with invalid MIC");
1024                         return;
1025                 }
1026                 sm->MICVerified = TRUE;
1027                 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1028                 sm->pending_1_of_4_timeout = 0;
1029         }
1030
1031         if (key_info & WPA_KEY_INFO_REQUEST) {
1032                 if (sm->MICVerified) {
1033                         sm->req_replay_counter_used = 1;
1034                         os_memcpy(sm->req_replay_counter, key->replay_counter,
1035                                   WPA_REPLAY_COUNTER_LEN);
1036                 } else {
1037                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1038                                         "received EAPOL-Key request with "
1039                                         "invalid MIC");
1040                         return;
1041                 }
1042
1043                 /*
1044                  * TODO: should decrypt key data field if encryption was used;
1045                  * even though MAC address KDE is not normally encrypted,
1046                  * supplicant is allowed to encrypt it.
1047                  */
1048                 if (msg == SMK_ERROR) {
1049 #ifdef CONFIG_PEERKEY
1050                         wpa_smk_error(wpa_auth, sm, key);
1051 #endif /* CONFIG_PEERKEY */
1052                         return;
1053                 } else if (key_info & WPA_KEY_INFO_ERROR) {
1054                         wpa_receive_error_report(
1055                                 wpa_auth, sm,
1056                                 !(key_info & WPA_KEY_INFO_KEY_TYPE));
1057                 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1058                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1059                                         "received EAPOL-Key Request for new "
1060                                         "4-Way Handshake");
1061                         wpa_request_new_ptk(sm);
1062 #ifdef CONFIG_PEERKEY
1063                 } else if (msg == SMK_M1) {
1064                         wpa_smk_m1(wpa_auth, sm, key);
1065 #endif /* CONFIG_PEERKEY */
1066                 } else if (key_data_length > 0 &&
1067                            wpa_parse_kde_ies((const u8 *) (key + 1),
1068                                              key_data_length, &kde) == 0 &&
1069                            kde.mac_addr) {
1070                 } else {
1071                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1072                                         "received EAPOL-Key Request for GTK "
1073                                         "rekeying");
1074                         eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1075                         wpa_rekey_gtk(wpa_auth, NULL);
1076                 }
1077         } else {
1078                 /* Do not allow the same key replay counter to be reused. This
1079                  * does also invalidate all other pending replay counters if
1080                  * retransmissions were used, i.e., we will only process one of
1081                  * the pending replies and ignore rest if more than one is
1082                  * received. */
1083                 sm->key_replay[0].valid = FALSE;
1084         }
1085
1086 #ifdef CONFIG_PEERKEY
1087         if (msg == SMK_M3) {
1088                 wpa_smk_m3(wpa_auth, sm, key);
1089                 return;
1090         }
1091 #endif /* CONFIG_PEERKEY */
1092
1093         os_free(sm->last_rx_eapol_key);
1094         sm->last_rx_eapol_key = os_malloc(data_len);
1095         if (sm->last_rx_eapol_key == NULL)
1096                 return;
1097         os_memcpy(sm->last_rx_eapol_key, data, data_len);
1098         sm->last_rx_eapol_key_len = data_len;
1099
1100         sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1101         sm->EAPOLKeyReceived = TRUE;
1102         sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1103         sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1104         os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1105         wpa_sm_step(sm);
1106 }
1107
1108
1109 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1110                           const u8 *gnonce, u8 *gtk, size_t gtk_len)
1111 {
1112         u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1113         u8 *pos;
1114         int ret = 0;
1115
1116         /* GTK = PRF-X(GMK, "Group key expansion",
1117          *      AA || GNonce || Time || random data)
1118          * The example described in the IEEE 802.11 standard uses only AA and
1119          * GNonce as inputs here. Add some more entropy since this derivation
1120          * is done only at the Authenticator and as such, does not need to be
1121          * exactly same.
1122          */
1123         os_memcpy(data, addr, ETH_ALEN);
1124         os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1125         pos = data + ETH_ALEN + WPA_NONCE_LEN;
1126         wpa_get_ntp_timestamp(pos);
1127         pos += 8;
1128         if (random_get_bytes(pos, 16) < 0)
1129                 ret = -1;
1130
1131 #ifdef CONFIG_IEEE80211W
1132         sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1133 #else /* CONFIG_IEEE80211W */
1134         if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1135             < 0)
1136                 ret = -1;
1137 #endif /* CONFIG_IEEE80211W */
1138
1139         return ret;
1140 }
1141
1142
1143 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1144 {
1145         struct wpa_authenticator *wpa_auth = eloop_ctx;
1146         struct wpa_state_machine *sm = timeout_ctx;
1147
1148         sm->pending_1_of_4_timeout = 0;
1149         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1150         sm->TimeoutEvt = TRUE;
1151         wpa_sm_step(sm);
1152 }
1153
1154
1155 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1156                       struct wpa_state_machine *sm, int key_info,
1157                       const u8 *key_rsc, const u8 *nonce,
1158                       const u8 *kde, size_t kde_len,
1159                       int keyidx, int encr, int force_version)
1160 {
1161         struct ieee802_1x_hdr *hdr;
1162         struct wpa_eapol_key *key;
1163         size_t len;
1164         int alg;
1165         int key_data_len, pad_len = 0;
1166         u8 *buf, *pos;
1167         int version, pairwise;
1168         int i;
1169
1170         len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1171
1172         if (force_version)
1173                 version = force_version;
1174         else if (wpa_use_aes_cmac(sm))
1175                 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1176         else if (sm->pairwise == WPA_CIPHER_CCMP)
1177                 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1178         else
1179                 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1180
1181         pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1182
1183         wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1184                    "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1185                    "encr=%d)",
1186                    version,
1187                    (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1188                    (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1189                    (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1190                    (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1191                    pairwise, (unsigned long) kde_len, keyidx, encr);
1192
1193         key_data_len = kde_len;
1194
1195         if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1196              version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1197                 pad_len = key_data_len % 8;
1198                 if (pad_len)
1199                         pad_len = 8 - pad_len;
1200                 key_data_len += pad_len + 8;
1201         }
1202
1203         len += key_data_len;
1204
1205         hdr = os_zalloc(len);
1206         if (hdr == NULL)
1207                 return;
1208         hdr->version = wpa_auth->conf.eapol_version;
1209         hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1210         hdr->length = host_to_be16(len  - sizeof(*hdr));
1211         key = (struct wpa_eapol_key *) (hdr + 1);
1212
1213         key->type = sm->wpa == WPA_VERSION_WPA2 ?
1214                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1215         key_info |= version;
1216         if (encr && sm->wpa == WPA_VERSION_WPA2)
1217                 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1218         if (sm->wpa != WPA_VERSION_WPA2)
1219                 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1220         WPA_PUT_BE16(key->key_info, key_info);
1221
1222         alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1223         switch (alg) {
1224         case WPA_CIPHER_CCMP:
1225                 WPA_PUT_BE16(key->key_length, 16);
1226                 break;
1227         case WPA_CIPHER_TKIP:
1228                 WPA_PUT_BE16(key->key_length, 32);
1229                 break;
1230         case WPA_CIPHER_WEP40:
1231                 WPA_PUT_BE16(key->key_length, 5);
1232                 break;
1233         case WPA_CIPHER_WEP104:
1234                 WPA_PUT_BE16(key->key_length, 13);
1235                 break;
1236         }
1237         if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1238                 WPA_PUT_BE16(key->key_length, 0);
1239
1240         /* FIX: STSL: what to use as key_replay_counter? */
1241         for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1242                 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1243                 os_memcpy(sm->key_replay[i].counter,
1244                           sm->key_replay[i - 1].counter,
1245                           WPA_REPLAY_COUNTER_LEN);
1246         }
1247         inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1248         os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1249                   WPA_REPLAY_COUNTER_LEN);
1250         sm->key_replay[0].valid = TRUE;
1251
1252         if (nonce)
1253                 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1254
1255         if (key_rsc)
1256                 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1257
1258         if (kde && !encr) {
1259                 os_memcpy(key + 1, kde, kde_len);
1260                 WPA_PUT_BE16(key->key_data_length, kde_len);
1261         } else if (encr && kde) {
1262                 buf = os_zalloc(key_data_len);
1263                 if (buf == NULL) {
1264                         os_free(hdr);
1265                         return;
1266                 }
1267                 pos = buf;
1268                 os_memcpy(pos, kde, kde_len);
1269                 pos += kde_len;
1270
1271                 if (pad_len)
1272                         *pos++ = 0xdd;
1273
1274                 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1275                                 buf, key_data_len);
1276                 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1277                     version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1278                         if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1279                                      (u8 *) (key + 1))) {
1280                                 os_free(hdr);
1281                                 os_free(buf);
1282                                 return;
1283                         }
1284                         WPA_PUT_BE16(key->key_data_length, key_data_len);
1285                 } else {
1286                         u8 ek[32];
1287                         os_memcpy(key->key_iv,
1288                                   sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1289                         inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1290                         os_memcpy(ek, key->key_iv, 16);
1291                         os_memcpy(ek + 16, sm->PTK.kek, 16);
1292                         os_memcpy(key + 1, buf, key_data_len);
1293                         rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1294                         WPA_PUT_BE16(key->key_data_length, key_data_len);
1295                 }
1296                 os_free(buf);
1297         }
1298
1299         if (key_info & WPA_KEY_INFO_MIC) {
1300                 if (!sm->PTK_valid) {
1301                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1302                                         "PTK not valid when sending EAPOL-Key "
1303                                         "frame");
1304                         os_free(hdr);
1305                         return;
1306                 }
1307                 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1308                                   key->key_mic);
1309         }
1310
1311         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1312                            1);
1313         wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1314                             sm->pairwise_set);
1315         os_free(hdr);
1316 }
1317
1318
1319 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1320                            struct wpa_state_machine *sm, int key_info,
1321                            const u8 *key_rsc, const u8 *nonce,
1322                            const u8 *kde, size_t kde_len,
1323                            int keyidx, int encr)
1324 {
1325         int timeout_ms;
1326         int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1327         int ctr;
1328
1329         if (sm == NULL)
1330                 return;
1331
1332         __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1333                          keyidx, encr, 0);
1334
1335         ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1336         if (ctr == 1 && wpa_auth->conf.tx_status)
1337                 timeout_ms = pairwise ? eapol_key_timeout_first :
1338                         eapol_key_timeout_first_group;
1339         else
1340                 timeout_ms = eapol_key_timeout_subseq;
1341         if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1342                 sm->pending_1_of_4_timeout = 1;
1343         wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1344                    "counter %d)", timeout_ms, ctr);
1345         eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1346                                wpa_send_eapol_timeout, wpa_auth, sm);
1347 }
1348
1349
1350 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1351 {
1352         struct ieee802_1x_hdr *hdr;
1353         struct wpa_eapol_key *key;
1354         u16 key_info;
1355         int ret = 0;
1356         u8 mic[16];
1357
1358         if (data_len < sizeof(*hdr) + sizeof(*key))
1359                 return -1;
1360
1361         hdr = (struct ieee802_1x_hdr *) data;
1362         key = (struct wpa_eapol_key *) (hdr + 1);
1363         key_info = WPA_GET_BE16(key->key_info);
1364         os_memcpy(mic, key->key_mic, 16);
1365         os_memset(key->key_mic, 0, 16);
1366         if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1367                               data, data_len, key->key_mic) ||
1368             os_memcmp(mic, key->key_mic, 16) != 0)
1369                 ret = -1;
1370         os_memcpy(key->key_mic, mic, 16);
1371         return ret;
1372 }
1373
1374
1375 void wpa_remove_ptk(struct wpa_state_machine *sm)
1376 {
1377         sm->PTK_valid = FALSE;
1378         os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1379         wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1380         sm->pairwise_set = FALSE;
1381         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1382 }
1383
1384
1385 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1386 {
1387         int remove_ptk = 1;
1388
1389         if (sm == NULL)
1390                 return -1;
1391
1392         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1393                          "event %d notification", event);
1394
1395         switch (event) {
1396         case WPA_AUTH:
1397         case WPA_ASSOC:
1398                 break;
1399         case WPA_DEAUTH:
1400         case WPA_DISASSOC:
1401                 sm->DeauthenticationRequest = TRUE;
1402                 break;
1403         case WPA_REAUTH:
1404         case WPA_REAUTH_EAPOL:
1405                 if (!sm->started) {
1406                         /*
1407                          * When using WPS, we may end up here if the STA
1408                          * manages to re-associate without the previous STA
1409                          * entry getting removed. Consequently, we need to make
1410                          * sure that the WPA state machines gets initialized
1411                          * properly at this point.
1412                          */
1413                         wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1414                                    "started - initialize now");
1415                         sm->started = 1;
1416                         sm->Init = TRUE;
1417                         if (wpa_sm_step(sm) == 1)
1418                                 return 1; /* should not really happen */
1419                         sm->Init = FALSE;
1420                         sm->AuthenticationRequest = TRUE;
1421                         break;
1422                 }
1423                 if (sm->GUpdateStationKeys) {
1424                         /*
1425                          * Reauthentication cancels the pending group key
1426                          * update for this STA.
1427                          */
1428                         sm->group->GKeyDoneStations--;
1429                         sm->GUpdateStationKeys = FALSE;
1430                         sm->PtkGroupInit = TRUE;
1431                 }
1432                 sm->ReAuthenticationRequest = TRUE;
1433                 break;
1434         case WPA_ASSOC_FT:
1435 #ifdef CONFIG_IEEE80211R
1436                 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1437                            "after association");
1438                 wpa_ft_install_ptk(sm);
1439
1440                 /* Using FT protocol, not WPA auth state machine */
1441                 sm->ft_completed = 1;
1442                 return 0;
1443 #else /* CONFIG_IEEE80211R */
1444                 break;
1445 #endif /* CONFIG_IEEE80211R */
1446         }
1447
1448 #ifdef CONFIG_IEEE80211R
1449         sm->ft_completed = 0;
1450 #endif /* CONFIG_IEEE80211R */
1451
1452 #ifdef CONFIG_IEEE80211W
1453         if (sm->mgmt_frame_prot && event == WPA_AUTH)
1454                 remove_ptk = 0;
1455 #endif /* CONFIG_IEEE80211W */
1456
1457         if (remove_ptk) {
1458                 sm->PTK_valid = FALSE;
1459                 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1460
1461                 if (event != WPA_REAUTH_EAPOL)
1462                         wpa_remove_ptk(sm);
1463         }
1464
1465         return wpa_sm_step(sm);
1466 }
1467
1468
1469 static enum wpa_alg wpa_alg_enum(int alg)
1470 {
1471         switch (alg) {
1472         case WPA_CIPHER_CCMP:
1473                 return WPA_ALG_CCMP;
1474         case WPA_CIPHER_TKIP:
1475                 return WPA_ALG_TKIP;
1476         case WPA_CIPHER_WEP104:
1477         case WPA_CIPHER_WEP40:
1478                 return WPA_ALG_WEP;
1479         default:
1480                 return WPA_ALG_NONE;
1481         }
1482 }
1483
1484
1485 SM_STATE(WPA_PTK, INITIALIZE)
1486 {
1487         SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1488         if (sm->Init) {
1489                 /* Init flag is not cleared here, so avoid busy
1490                  * loop by claiming nothing changed. */
1491                 sm->changed = FALSE;
1492         }
1493
1494         sm->keycount = 0;
1495         if (sm->GUpdateStationKeys)
1496                 sm->group->GKeyDoneStations--;
1497         sm->GUpdateStationKeys = FALSE;
1498         if (sm->wpa == WPA_VERSION_WPA)
1499                 sm->PInitAKeys = FALSE;
1500         if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1501                * Local AA > Remote AA)) */) {
1502                 sm->Pair = TRUE;
1503         }
1504         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1505         wpa_remove_ptk(sm);
1506         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1507         sm->TimeoutCtr = 0;
1508         if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1509                 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1510                                    WPA_EAPOL_authorized, 0);
1511         }
1512 }
1513
1514
1515 SM_STATE(WPA_PTK, DISCONNECT)
1516 {
1517         SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1518         sm->Disconnect = FALSE;
1519         wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1520 }
1521
1522
1523 SM_STATE(WPA_PTK, DISCONNECTED)
1524 {
1525         SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1526         sm->DeauthenticationRequest = FALSE;
1527 }
1528
1529
1530 SM_STATE(WPA_PTK, AUTHENTICATION)
1531 {
1532         SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1533         os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1534         sm->PTK_valid = FALSE;
1535         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1536                            1);
1537         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1538         sm->AuthenticationRequest = FALSE;
1539 }
1540
1541
1542 static void wpa_group_first_station(struct wpa_authenticator *wpa_auth,
1543                                     struct wpa_group *group)
1544 {
1545         /*
1546          * System has run bit further than at the time hostapd was started
1547          * potentially very early during boot up. This provides better chances
1548          * of collecting more randomness on embedded systems. Re-initialize the
1549          * GMK and Counter here to improve their strength if there was not
1550          * enough entropy available immediately after system startup.
1551          */
1552         wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1553                    "station");
1554         if (random_pool_ready() != 1) {
1555                 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1556                            "to proceed - reject first 4-way handshake");
1557                 group->reject_4way_hs_for_entropy = TRUE;
1558         }
1559         wpa_group_init_gmk_and_counter(wpa_auth, group);
1560         wpa_gtk_update(wpa_auth, group);
1561         wpa_group_config_group_keys(wpa_auth, group);
1562 }
1563
1564
1565 SM_STATE(WPA_PTK, AUTHENTICATION2)
1566 {
1567         SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1568
1569         if (!sm->group->first_sta_seen) {
1570                 wpa_group_first_station(sm->wpa_auth, sm->group);
1571                 sm->group->first_sta_seen = TRUE;
1572         }
1573
1574         os_memcpy(sm->ANonce, sm->group->Counter, WPA_NONCE_LEN);
1575         wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1576                     WPA_NONCE_LEN);
1577         inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1578         sm->ReAuthenticationRequest = FALSE;
1579         /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1580          * logical place than INITIALIZE since AUTHENTICATION2 can be
1581          * re-entered on ReAuthenticationRequest without going through
1582          * INITIALIZE. */
1583         sm->TimeoutCtr = 0;
1584 }
1585
1586
1587 SM_STATE(WPA_PTK, INITPMK)
1588 {
1589         u8 msk[2 * PMK_LEN];
1590         size_t len = 2 * PMK_LEN;
1591
1592         SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1593 #ifdef CONFIG_IEEE80211R
1594         sm->xxkey_len = 0;
1595 #endif /* CONFIG_IEEE80211R */
1596         if (sm->pmksa) {
1597                 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1598                 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1599         } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1600                 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1601                            "(len=%lu)", (unsigned long) len);
1602                 os_memcpy(sm->PMK, msk, PMK_LEN);
1603 #ifdef CONFIG_IEEE80211R
1604                 if (len >= 2 * PMK_LEN) {
1605                         os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1606                         sm->xxkey_len = PMK_LEN;
1607                 }
1608 #endif /* CONFIG_IEEE80211R */
1609         } else {
1610                 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1611         }
1612
1613         sm->req_replay_counter_used = 0;
1614         /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1615          * will break reauthentication since EAPOL state machines may not be
1616          * get into AUTHENTICATING state that clears keyRun before WPA state
1617          * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1618          * state and takes PMK from the previously used AAA Key. This will
1619          * eventually fail in 4-Way Handshake because Supplicant uses PMK
1620          * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1621          * be good workaround for this issue. */
1622         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1623 }
1624
1625
1626 SM_STATE(WPA_PTK, INITPSK)
1627 {
1628         const u8 *psk;
1629         SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1630         psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1631         if (psk) {
1632                 os_memcpy(sm->PMK, psk, PMK_LEN);
1633 #ifdef CONFIG_IEEE80211R
1634                 os_memcpy(sm->xxkey, psk, PMK_LEN);
1635                 sm->xxkey_len = PMK_LEN;
1636 #endif /* CONFIG_IEEE80211R */
1637         }
1638         sm->req_replay_counter_used = 0;
1639 }
1640
1641
1642 SM_STATE(WPA_PTK, PTKSTART)
1643 {
1644         u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1645         size_t pmkid_len = 0;
1646
1647         SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1648         sm->PTKRequest = FALSE;
1649         sm->TimeoutEvt = FALSE;
1650
1651         sm->TimeoutCtr++;
1652         if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1653                 /* No point in sending the EAPOL-Key - we will disconnect
1654                  * immediately following this. */
1655                 return;
1656         }
1657
1658         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1659                         "sending 1/4 msg of 4-Way Handshake");
1660         /*
1661          * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1662          * one possible PSK for this STA.
1663          */
1664         if (sm->wpa == WPA_VERSION_WPA2 &&
1665             wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1666                 pmkid = buf;
1667                 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1668                 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1669                 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1670                 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1671                 if (sm->pmksa)
1672                         os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1673                                   sm->pmksa->pmkid, PMKID_LEN);
1674                 else {
1675                         /*
1676                          * Calculate PMKID since no PMKSA cache entry was
1677                          * available with pre-calculated PMKID.
1678                          */
1679                         rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1680                                   sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1681                                   wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1682                 }
1683         }
1684         wpa_send_eapol(sm->wpa_auth, sm,
1685                        WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1686                        sm->ANonce, pmkid, pmkid_len, 0, 0);
1687 }
1688
1689
1690 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1691                           struct wpa_ptk *ptk)
1692 {
1693         size_t ptk_len = sm->pairwise == WPA_CIPHER_CCMP ? 48 : 64;
1694 #ifdef CONFIG_IEEE80211R
1695         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1696                 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1697 #endif /* CONFIG_IEEE80211R */
1698
1699         wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1700                        sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1701                        (u8 *) ptk, ptk_len,
1702                        wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1703
1704         return 0;
1705 }
1706
1707
1708 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1709 {
1710         struct wpa_ptk PTK;
1711         int ok = 0;
1712         const u8 *pmk = NULL;
1713
1714         SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1715         sm->EAPOLKeyReceived = FALSE;
1716
1717         /* WPA with IEEE 802.1X: use the derived PMK from EAP
1718          * WPA-PSK: iterate through possible PSKs and select the one matching
1719          * the packet */
1720         for (;;) {
1721                 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1722                         pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1723                         if (pmk == NULL)
1724                                 break;
1725                 } else
1726                         pmk = sm->PMK;
1727
1728                 wpa_derive_ptk(sm, pmk, &PTK);
1729
1730                 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1731                                        sm->last_rx_eapol_key_len) == 0) {
1732                         ok = 1;
1733                         break;
1734                 }
1735
1736                 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1737                         break;
1738         }
1739
1740         if (!ok) {
1741                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1742                                 "invalid MIC in msg 2/4 of 4-Way Handshake");
1743                 return;
1744         }
1745
1746 #ifdef CONFIG_IEEE80211R
1747         if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1748                 /*
1749                  * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1750                  * with the value we derived.
1751                  */
1752                 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1753                               WPA_PMK_NAME_LEN) != 0) {
1754                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1755                                         "PMKR1Name mismatch in FT 4-way "
1756                                         "handshake");
1757                         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1758                                     "Supplicant",
1759                                     sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1760                         wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1761                                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1762                         return;
1763                 }
1764         }
1765 #endif /* CONFIG_IEEE80211R */
1766
1767         sm->pending_1_of_4_timeout = 0;
1768         eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1769
1770         if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1771                 /* PSK may have changed from the previous choice, so update
1772                  * state machine data based on whatever PSK was selected here.
1773                  */
1774                 os_memcpy(sm->PMK, pmk, PMK_LEN);
1775         }
1776
1777         sm->MICVerified = TRUE;
1778
1779         os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1780         sm->PTK_valid = TRUE;
1781 }
1782
1783
1784 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1785 {
1786         SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1787         sm->TimeoutCtr = 0;
1788 }
1789
1790
1791 #ifdef CONFIG_IEEE80211W
1792
1793 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1794 {
1795         if (sm->mgmt_frame_prot) {
1796                 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1797         }
1798
1799         return 0;
1800 }
1801
1802
1803 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1804 {
1805         struct wpa_igtk_kde igtk;
1806         struct wpa_group *gsm = sm->group;
1807
1808         if (!sm->mgmt_frame_prot)
1809                 return pos;
1810
1811         igtk.keyid[0] = gsm->GN_igtk;
1812         igtk.keyid[1] = 0;
1813         if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1814             wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1815                 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1816         os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1817         pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1818                           (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1819
1820         return pos;
1821 }
1822
1823 #else /* CONFIG_IEEE80211W */
1824
1825 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1826 {
1827         return 0;
1828 }
1829
1830
1831 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1832 {
1833         return pos;
1834 }
1835
1836 #endif /* CONFIG_IEEE80211W */
1837
1838
1839 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1840 {
1841         u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos;
1842         size_t gtk_len, kde_len;
1843         struct wpa_group *gsm = sm->group;
1844         u8 *wpa_ie;
1845         int wpa_ie_len, secure, keyidx, encr = 0;
1846
1847         SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1848         sm->TimeoutEvt = FALSE;
1849
1850         sm->TimeoutCtr++;
1851         if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1852                 /* No point in sending the EAPOL-Key - we will disconnect
1853                  * immediately following this. */
1854                 return;
1855         }
1856
1857         /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1858            GTK[GN], IGTK, [FTIE], [TIE * 2])
1859          */
1860         os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1861         wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1862         /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1863         wpa_ie = sm->wpa_auth->wpa_ie;
1864         wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1865         if (sm->wpa == WPA_VERSION_WPA &&
1866             (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1867             wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1868                 /* WPA-only STA, remove RSN IE */
1869                 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1870                 wpa_ie_len = wpa_ie[1] + 2;
1871         }
1872         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1873                         "sending 3/4 msg of 4-Way Handshake");
1874         if (sm->wpa == WPA_VERSION_WPA2) {
1875                 /* WPA2 send GTK in the 4-way handshake */
1876                 secure = 1;
1877                 gtk = gsm->GTK[gsm->GN - 1];
1878                 gtk_len = gsm->GTK_len;
1879                 keyidx = gsm->GN;
1880                 _rsc = rsc;
1881                 encr = 1;
1882         } else {
1883                 /* WPA does not include GTK in msg 3/4 */
1884                 secure = 0;
1885                 gtk = NULL;
1886                 gtk_len = 0;
1887                 keyidx = 0;
1888                 _rsc = NULL;
1889                 if (sm->rx_eapol_key_secure) {
1890                         /*
1891                          * It looks like Windows 7 supplicant tries to use
1892                          * Secure bit in msg 2/4 after having reported Michael
1893                          * MIC failure and it then rejects the 4-way handshake
1894                          * if msg 3/4 does not set Secure bit. Work around this
1895                          * by setting the Secure bit here even in the case of
1896                          * WPA if the supplicant used it first.
1897                          */
1898                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1899                                         "STA used Secure bit in WPA msg 2/4 - "
1900                                         "set Secure for 3/4 as workaround");
1901                         secure = 1;
1902                 }
1903         }
1904
1905         kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1906         if (gtk)
1907                 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1908 #ifdef CONFIG_IEEE80211R
1909         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1910                 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1911                 kde_len += 300; /* FTIE + 2 * TIE */
1912         }
1913 #endif /* CONFIG_IEEE80211R */
1914         kde = os_malloc(kde_len);
1915         if (kde == NULL)
1916                 return;
1917
1918         pos = kde;
1919         os_memcpy(pos, wpa_ie, wpa_ie_len);
1920         pos += wpa_ie_len;
1921 #ifdef CONFIG_IEEE80211R
1922         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1923                 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1924                 if (res < 0) {
1925                         wpa_printf(MSG_ERROR, "FT: Failed to insert "
1926                                    "PMKR1Name into RSN IE in EAPOL-Key data");
1927                         os_free(kde);
1928                         return;
1929                 }
1930                 pos += res;
1931         }
1932 #endif /* CONFIG_IEEE80211R */
1933         if (gtk) {
1934                 u8 hdr[2];
1935                 hdr[0] = keyidx & 0x03;
1936                 hdr[1] = 0;
1937                 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
1938                                   gtk, gtk_len);
1939         }
1940         pos = ieee80211w_kde_add(sm, pos);
1941
1942 #ifdef CONFIG_IEEE80211R
1943         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1944                 int res;
1945                 struct wpa_auth_config *conf;
1946
1947                 conf = &sm->wpa_auth->conf;
1948                 res = wpa_write_ftie(conf, conf->r0_key_holder,
1949                                      conf->r0_key_holder_len,
1950                                      NULL, NULL, pos, kde + kde_len - pos,
1951                                      NULL, 0);
1952                 if (res < 0) {
1953                         wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
1954                                    "into EAPOL-Key Key Data");
1955                         os_free(kde);
1956                         return;
1957                 }
1958                 pos += res;
1959
1960                 /* TIE[ReassociationDeadline] (TU) */
1961                 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
1962                 *pos++ = 5;
1963                 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
1964                 WPA_PUT_LE32(pos, conf->reassociation_deadline);
1965                 pos += 4;
1966
1967                 /* TIE[KeyLifetime] (seconds) */
1968                 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
1969                 *pos++ = 5;
1970                 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
1971                 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
1972                 pos += 4;
1973         }
1974 #endif /* CONFIG_IEEE80211R */
1975
1976         wpa_send_eapol(sm->wpa_auth, sm,
1977                        (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
1978                        WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
1979                        WPA_KEY_INFO_KEY_TYPE,
1980                        _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
1981         os_free(kde);
1982 }
1983
1984
1985 SM_STATE(WPA_PTK, PTKINITDONE)
1986 {
1987         SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
1988         sm->EAPOLKeyReceived = FALSE;
1989         if (sm->Pair) {
1990                 enum wpa_alg alg;
1991                 int klen;
1992                 if (sm->pairwise == WPA_CIPHER_TKIP) {
1993                         alg = WPA_ALG_TKIP;
1994                         klen = 32;
1995                 } else {
1996                         alg = WPA_ALG_CCMP;
1997                         klen = 16;
1998                 }
1999                 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2000                                      sm->PTK.tk1, klen)) {
2001                         wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2002                         return;
2003                 }
2004                 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2005                 sm->pairwise_set = TRUE;
2006
2007                 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2008                         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2009                         eloop_register_timeout(sm->wpa_auth->conf.
2010                                                wpa_ptk_rekey, 0, wpa_rekey_ptk,
2011                                                sm->wpa_auth, sm);
2012                 }
2013
2014                 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2015                         wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2016                                            WPA_EAPOL_authorized, 1);
2017                 }
2018         }
2019
2020         if (0 /* IBSS == TRUE */) {
2021                 sm->keycount++;
2022                 if (sm->keycount == 2) {
2023                         wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2024                                            WPA_EAPOL_portValid, 1);
2025                 }
2026         } else {
2027                 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2028                                    1);
2029         }
2030         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2031         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2032         if (sm->wpa == WPA_VERSION_WPA)
2033                 sm->PInitAKeys = TRUE;
2034         else
2035                 sm->has_GTK = TRUE;
2036         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2037                          "pairwise key handshake completed (%s)",
2038                          sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2039
2040 #ifdef CONFIG_IEEE80211R
2041         wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2042 #endif /* CONFIG_IEEE80211R */
2043 }
2044
2045
2046 SM_STEP(WPA_PTK)
2047 {
2048         struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2049
2050         if (sm->Init)
2051                 SM_ENTER(WPA_PTK, INITIALIZE);
2052         else if (sm->Disconnect
2053                  /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2054                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2055                                 "WPA_PTK: sm->Disconnect");
2056                 SM_ENTER(WPA_PTK, DISCONNECT);
2057         }
2058         else if (sm->DeauthenticationRequest)
2059                 SM_ENTER(WPA_PTK, DISCONNECTED);
2060         else if (sm->AuthenticationRequest)
2061                 SM_ENTER(WPA_PTK, AUTHENTICATION);
2062         else if (sm->ReAuthenticationRequest)
2063                 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2064         else if (sm->PTKRequest)
2065                 SM_ENTER(WPA_PTK, PTKSTART);
2066         else switch (sm->wpa_ptk_state) {
2067         case WPA_PTK_INITIALIZE:
2068                 break;
2069         case WPA_PTK_DISCONNECT:
2070                 SM_ENTER(WPA_PTK, DISCONNECTED);
2071                 break;
2072         case WPA_PTK_DISCONNECTED:
2073                 SM_ENTER(WPA_PTK, INITIALIZE);
2074                 break;
2075         case WPA_PTK_AUTHENTICATION:
2076                 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2077                 break;
2078         case WPA_PTK_AUTHENTICATION2:
2079                 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2080                     wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2081                                        WPA_EAPOL_keyRun) > 0)
2082                         SM_ENTER(WPA_PTK, INITPMK);
2083                 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2084                          /* FIX: && 802.1X::keyRun */)
2085                         SM_ENTER(WPA_PTK, INITPSK);
2086                 break;
2087         case WPA_PTK_INITPMK:
2088                 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2089                                        WPA_EAPOL_keyAvailable) > 0)
2090                         SM_ENTER(WPA_PTK, PTKSTART);
2091                 else {
2092                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2093                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2094                                         "INITPMK - keyAvailable = false");
2095                         SM_ENTER(WPA_PTK, DISCONNECT);
2096                 }
2097                 break;
2098         case WPA_PTK_INITPSK:
2099                 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2100                         SM_ENTER(WPA_PTK, PTKSTART);
2101                 else {
2102                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2103                                         "no PSK configured for the STA");
2104                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2105                         SM_ENTER(WPA_PTK, DISCONNECT);
2106                 }
2107                 break;
2108         case WPA_PTK_PTKSTART:
2109                 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2110                     sm->EAPOLKeyPairwise)
2111                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2112                 else if (sm->TimeoutCtr >
2113                          (int) dot11RSNAConfigPairwiseUpdateCount) {
2114                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2115                         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2116                                          "PTKSTART: Retry limit %d reached",
2117                                          dot11RSNAConfigPairwiseUpdateCount);
2118                         SM_ENTER(WPA_PTK, DISCONNECT);
2119                 } else if (sm->TimeoutEvt)
2120                         SM_ENTER(WPA_PTK, PTKSTART);
2121                 break;
2122         case WPA_PTK_PTKCALCNEGOTIATING:
2123                 if (sm->MICVerified)
2124                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2125                 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2126                          sm->EAPOLKeyPairwise)
2127                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2128                 else if (sm->TimeoutEvt)
2129                         SM_ENTER(WPA_PTK, PTKSTART);
2130                 break;
2131         case WPA_PTK_PTKCALCNEGOTIATING2:
2132                 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2133                 break;
2134         case WPA_PTK_PTKINITNEGOTIATING:
2135                 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2136                     sm->EAPOLKeyPairwise && sm->MICVerified)
2137                         SM_ENTER(WPA_PTK, PTKINITDONE);
2138                 else if (sm->TimeoutCtr >
2139                          (int) dot11RSNAConfigPairwiseUpdateCount) {
2140                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2141                         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2142                                          "PTKINITNEGOTIATING: Retry limit %d "
2143                                          "reached",
2144                                          dot11RSNAConfigPairwiseUpdateCount);
2145                         SM_ENTER(WPA_PTK, DISCONNECT);
2146                 } else if (sm->TimeoutEvt)
2147                         SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2148                 break;
2149         case WPA_PTK_PTKINITDONE:
2150                 break;
2151         }
2152 }
2153
2154
2155 SM_STATE(WPA_PTK_GROUP, IDLE)
2156 {
2157         SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2158         if (sm->Init) {
2159                 /* Init flag is not cleared here, so avoid busy
2160                  * loop by claiming nothing changed. */
2161                 sm->changed = FALSE;
2162         }
2163         sm->GTimeoutCtr = 0;
2164 }
2165
2166
2167 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2168 {
2169         u8 rsc[WPA_KEY_RSC_LEN];
2170         struct wpa_group *gsm = sm->group;
2171         u8 *kde, *pos, hdr[2];
2172         size_t kde_len;
2173
2174         SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2175
2176         sm->GTimeoutCtr++;
2177         if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2178                 /* No point in sending the EAPOL-Key - we will disconnect
2179                  * immediately following this. */
2180                 return;
2181         }
2182
2183         if (sm->wpa == WPA_VERSION_WPA)
2184                 sm->PInitAKeys = FALSE;
2185         sm->TimeoutEvt = FALSE;
2186         /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2187         os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2188         if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2189                 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2190         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2191                         "sending 1/2 msg of Group Key Handshake");
2192
2193         if (sm->wpa == WPA_VERSION_WPA2) {
2194                 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2195                         ieee80211w_kde_len(sm);
2196                 kde = os_malloc(kde_len);
2197                 if (kde == NULL)
2198                         return;
2199
2200                 pos = kde;
2201                 hdr[0] = gsm->GN & 0x03;
2202                 hdr[1] = 0;
2203                 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2204                                   gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2205                 pos = ieee80211w_kde_add(sm, pos);
2206         } else {
2207                 kde = gsm->GTK[gsm->GN - 1];
2208                 pos = kde + gsm->GTK_len;
2209         }
2210
2211         wpa_send_eapol(sm->wpa_auth, sm,
2212                        WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2213                        WPA_KEY_INFO_ACK |
2214                        (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2215                        rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2216         if (sm->wpa == WPA_VERSION_WPA2)
2217                 os_free(kde);
2218 }
2219
2220
2221 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2222 {
2223         SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2224         sm->EAPOLKeyReceived = FALSE;
2225         if (sm->GUpdateStationKeys)
2226                 sm->group->GKeyDoneStations--;
2227         sm->GUpdateStationKeys = FALSE;
2228         sm->GTimeoutCtr = 0;
2229         /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2230         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2231                          "group key handshake completed (%s)",
2232                          sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2233         sm->has_GTK = TRUE;
2234 }
2235
2236
2237 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2238 {
2239         SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2240         if (sm->GUpdateStationKeys)
2241                 sm->group->GKeyDoneStations--;
2242         sm->GUpdateStationKeys = FALSE;
2243         sm->Disconnect = TRUE;
2244 }
2245
2246
2247 SM_STEP(WPA_PTK_GROUP)
2248 {
2249         if (sm->Init || sm->PtkGroupInit) {
2250                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2251                 sm->PtkGroupInit = FALSE;
2252         } else switch (sm->wpa_ptk_group_state) {
2253         case WPA_PTK_GROUP_IDLE:
2254                 if (sm->GUpdateStationKeys ||
2255                     (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2256                         SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2257                 break;
2258         case WPA_PTK_GROUP_REKEYNEGOTIATING:
2259                 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2260                     !sm->EAPOLKeyPairwise && sm->MICVerified)
2261                         SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2262                 else if (sm->GTimeoutCtr >
2263                          (int) dot11RSNAConfigGroupUpdateCount)
2264                         SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2265                 else if (sm->TimeoutEvt)
2266                         SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2267                 break;
2268         case WPA_PTK_GROUP_KEYERROR:
2269                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2270                 break;
2271         case WPA_PTK_GROUP_REKEYESTABLISHED:
2272                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2273                 break;
2274         }
2275 }
2276
2277
2278 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2279                           struct wpa_group *group)
2280 {
2281         int ret = 0;
2282
2283         os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2284         inc_byte_array(group->Counter, WPA_NONCE_LEN);
2285         if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2286                            wpa_auth->addr, group->GNonce,
2287                            group->GTK[group->GN - 1], group->GTK_len) < 0)
2288                 ret = -1;
2289         wpa_hexdump_key(MSG_DEBUG, "GTK",
2290                         group->GTK[group->GN - 1], group->GTK_len);
2291
2292 #ifdef CONFIG_IEEE80211W
2293         if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2294                 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2295                 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2296                 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2297                                    wpa_auth->addr, group->GNonce,
2298                                    group->IGTK[group->GN_igtk - 4],
2299                                    WPA_IGTK_LEN) < 0)
2300                         ret = -1;
2301                 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2302                                 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2303         }
2304 #endif /* CONFIG_IEEE80211W */
2305
2306         return ret;
2307 }
2308
2309
2310 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2311                                struct wpa_group *group)
2312 {
2313         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2314                    "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2315         group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2316         group->wpa_group_state = WPA_GROUP_GTK_INIT;
2317
2318         /* GTK[0..N] = 0 */
2319         os_memset(group->GTK, 0, sizeof(group->GTK));
2320         group->GN = 1;
2321         group->GM = 2;
2322 #ifdef CONFIG_IEEE80211W
2323         group->GN_igtk = 4;
2324         group->GM_igtk = 5;
2325 #endif /* CONFIG_IEEE80211W */
2326         /* GTK[GN] = CalcGTK() */
2327         wpa_gtk_update(wpa_auth, group);
2328 }
2329
2330
2331 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2332 {
2333         if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2334                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2335                                 "Not in PTKINITDONE; skip Group Key update");
2336                 sm->GUpdateStationKeys = FALSE;
2337                 return 0;
2338         }
2339         if (sm->GUpdateStationKeys) {
2340                 /*
2341                  * This should not really happen, so add a debug log entry.
2342                  * Since we clear the GKeyDoneStations before the loop, the
2343                  * station needs to be counted here anyway.
2344                  */
2345                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2346                                 "GUpdateStationKeys was already set when "
2347                                 "marking station for GTK rekeying");
2348         }
2349
2350         sm->group->GKeyDoneStations++;
2351         sm->GUpdateStationKeys = TRUE;
2352
2353         wpa_sm_step(sm);
2354         return 0;
2355 }
2356
2357
2358 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2359                               struct wpa_group *group)
2360 {
2361         int tmp;
2362
2363         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2364                    "SETKEYS (VLAN-ID %d)", group->vlan_id);
2365         group->changed = TRUE;
2366         group->wpa_group_state = WPA_GROUP_SETKEYS;
2367         group->GTKReKey = FALSE;
2368         tmp = group->GM;
2369         group->GM = group->GN;
2370         group->GN = tmp;
2371 #ifdef CONFIG_IEEE80211W
2372         tmp = group->GM_igtk;
2373         group->GM_igtk = group->GN_igtk;
2374         group->GN_igtk = tmp;
2375 #endif /* CONFIG_IEEE80211W */
2376         /* "GKeyDoneStations = GNoStations" is done in more robust way by
2377          * counting the STAs that are marked with GUpdateStationKeys instead of
2378          * including all STAs that could be in not-yet-completed state. */
2379         wpa_gtk_update(wpa_auth, group);
2380
2381         if (group->GKeyDoneStations) {
2382                 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2383                            "GKeyDoneStations=%d when starting new GTK rekey",
2384                            group->GKeyDoneStations);
2385                 group->GKeyDoneStations = 0;
2386         }
2387         wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, NULL);
2388         wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2389                    group->GKeyDoneStations);
2390 }
2391
2392
2393 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2394                                        struct wpa_group *group)
2395 {
2396         int ret = 0;
2397
2398         if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2399                              wpa_alg_enum(wpa_auth->conf.wpa_group),
2400                              broadcast_ether_addr, group->GN,
2401                              group->GTK[group->GN - 1], group->GTK_len) < 0)
2402                 ret = -1;
2403
2404 #ifdef CONFIG_IEEE80211W
2405         if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2406             wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2407                              broadcast_ether_addr, group->GN_igtk,
2408                              group->IGTK[group->GN_igtk - 4],
2409                              WPA_IGTK_LEN) < 0)
2410                 ret = -1;
2411 #endif /* CONFIG_IEEE80211W */
2412
2413         return ret;
2414 }
2415
2416
2417 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2418                                  struct wpa_group *group)
2419 {
2420         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2421                    "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2422         group->changed = TRUE;
2423         group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2424
2425         if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2426                 return -1;
2427
2428         return 0;
2429 }
2430
2431
2432 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2433                               struct wpa_group *group)
2434 {
2435         if (group->GInit) {
2436                 wpa_group_gtk_init(wpa_auth, group);
2437         } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2438                    group->GTKAuthenticator) {
2439                 wpa_group_setkeysdone(wpa_auth, group);
2440         } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2441                    group->GTKReKey) {
2442                 wpa_group_setkeys(wpa_auth, group);
2443         } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2444                 if (group->GKeyDoneStations == 0)
2445                         wpa_group_setkeysdone(wpa_auth, group);
2446                 else if (group->GTKReKey)
2447                         wpa_group_setkeys(wpa_auth, group);
2448         }
2449 }
2450
2451
2452 static int wpa_sm_step(struct wpa_state_machine *sm)
2453 {
2454         if (sm == NULL)
2455                 return 0;
2456
2457         if (sm->in_step_loop) {
2458                 /* This should not happen, but if it does, make sure we do not
2459                  * end up freeing the state machine too early by exiting the
2460                  * recursive call. */
2461                 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2462                 return 0;
2463         }
2464
2465         sm->in_step_loop = 1;
2466         do {
2467                 if (sm->pending_deinit)
2468                         break;
2469
2470                 sm->changed = FALSE;
2471                 sm->wpa_auth->group->changed = FALSE;
2472
2473                 SM_STEP_RUN(WPA_PTK);
2474                 if (sm->pending_deinit)
2475                         break;
2476                 SM_STEP_RUN(WPA_PTK_GROUP);
2477                 if (sm->pending_deinit)
2478                         break;
2479                 wpa_group_sm_step(sm->wpa_auth, sm->group);
2480         } while (sm->changed || sm->wpa_auth->group->changed);
2481         sm->in_step_loop = 0;
2482
2483         if (sm->pending_deinit) {
2484                 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2485                            "machine deinit for " MACSTR, MAC2STR(sm->addr));
2486                 wpa_free_sta_sm(sm);
2487                 return 1;
2488         }
2489         return 0;
2490 }
2491
2492
2493 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2494 {
2495         struct wpa_state_machine *sm = eloop_ctx;
2496         wpa_sm_step(sm);
2497 }
2498
2499
2500 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2501 {
2502         if (sm == NULL)
2503                 return;
2504         eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2505 }
2506
2507
2508 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2509 {
2510         int tmp, i;
2511         struct wpa_group *group;
2512
2513         if (wpa_auth == NULL)
2514                 return;
2515
2516         group = wpa_auth->group;
2517
2518         for (i = 0; i < 2; i++) {
2519                 tmp = group->GM;
2520                 group->GM = group->GN;
2521                 group->GN = tmp;
2522 #ifdef CONFIG_IEEE80211W
2523                 tmp = group->GM_igtk;
2524                 group->GM_igtk = group->GN_igtk;
2525                 group->GN_igtk = tmp;
2526 #endif /* CONFIG_IEEE80211W */
2527                 wpa_gtk_update(wpa_auth, group);
2528                 wpa_group_config_group_keys(wpa_auth, group);
2529         }
2530 }
2531
2532
2533 static const char * wpa_bool_txt(int bool)
2534 {
2535         return bool ? "TRUE" : "FALSE";
2536 }
2537
2538
2539 static int wpa_cipher_bits(int cipher)
2540 {
2541         switch (cipher) {
2542         case WPA_CIPHER_CCMP:
2543                 return 128;
2544         case WPA_CIPHER_TKIP:
2545                 return 256;
2546         case WPA_CIPHER_WEP104:
2547                 return 104;
2548         case WPA_CIPHER_WEP40:
2549                 return 40;
2550         default:
2551                 return 0;
2552         }
2553 }
2554
2555
2556 #define RSN_SUITE "%02x-%02x-%02x-%d"
2557 #define RSN_SUITE_ARG(s) \
2558 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2559
2560 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2561 {
2562         int len = 0, ret;
2563         char pmkid_txt[PMKID_LEN * 2 + 1];
2564 #ifdef CONFIG_RSN_PREAUTH
2565         const int preauth = 1;
2566 #else /* CONFIG_RSN_PREAUTH */
2567         const int preauth = 0;
2568 #endif /* CONFIG_RSN_PREAUTH */
2569
2570         if (wpa_auth == NULL)
2571                 return len;
2572
2573         ret = os_snprintf(buf + len, buflen - len,
2574                           "dot11RSNAOptionImplemented=TRUE\n"
2575                           "dot11RSNAPreauthenticationImplemented=%s\n"
2576                           "dot11RSNAEnabled=%s\n"
2577                           "dot11RSNAPreauthenticationEnabled=%s\n",
2578                           wpa_bool_txt(preauth),
2579                           wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2580                           wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2581         if (ret < 0 || (size_t) ret >= buflen - len)
2582                 return len;
2583         len += ret;
2584
2585         wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2586                          wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2587
2588         ret = os_snprintf(
2589                 buf + len, buflen - len,
2590                 "dot11RSNAConfigVersion=%u\n"
2591                 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2592                 /* FIX: dot11RSNAConfigGroupCipher */
2593                 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2594                 /* FIX: dot11RSNAConfigGroupRekeyTime */
2595                 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2596                 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2597                 "dot11RSNAConfigGroupUpdateCount=%u\n"
2598                 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2599                 "dot11RSNAConfigGroupCipherSize=%u\n"
2600                 "dot11RSNAConfigPMKLifetime=%u\n"
2601                 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2602                 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2603                 "dot11RSNAConfigSATimeout=%u\n"
2604                 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2605                 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2606                 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2607                 "dot11RSNAPMKIDUsed=%s\n"
2608                 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2609                 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2610                 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2611                 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2612                 "dot11RSNA4WayHandshakeFailures=%u\n"
2613                 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2614                 RSN_VERSION,
2615                 !!wpa_auth->conf.wpa_strict_rekey,
2616                 dot11RSNAConfigGroupUpdateCount,
2617                 dot11RSNAConfigPairwiseUpdateCount,
2618                 wpa_cipher_bits(wpa_auth->conf.wpa_group),
2619                 dot11RSNAConfigPMKLifetime,
2620                 dot11RSNAConfigPMKReauthThreshold,
2621                 dot11RSNAConfigSATimeout,
2622                 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2623                 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2624                 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2625                 pmkid_txt,
2626                 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2627                 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2628                 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2629                 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2630                 wpa_auth->dot11RSNA4WayHandshakeFailures);
2631         if (ret < 0 || (size_t) ret >= buflen - len)
2632                 return len;
2633         len += ret;
2634
2635         /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2636         /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2637
2638         /* Private MIB */
2639         ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2640                           wpa_auth->group->wpa_group_state);
2641         if (ret < 0 || (size_t) ret >= buflen - len)
2642                 return len;
2643         len += ret;
2644
2645         return len;
2646 }
2647
2648
2649 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2650 {
2651         int len = 0, ret;
2652         u32 pairwise = 0;
2653
2654         if (sm == NULL)
2655                 return 0;
2656
2657         /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2658
2659         /* dot11RSNAStatsEntry */
2660
2661         if (sm->wpa == WPA_VERSION_WPA) {
2662                 if (sm->pairwise == WPA_CIPHER_CCMP)
2663                         pairwise = WPA_CIPHER_SUITE_CCMP;
2664                 else if (sm->pairwise == WPA_CIPHER_TKIP)
2665                         pairwise = WPA_CIPHER_SUITE_TKIP;
2666                 else if (sm->pairwise == WPA_CIPHER_WEP104)
2667                         pairwise = WPA_CIPHER_SUITE_WEP104;
2668                 else if (sm->pairwise == WPA_CIPHER_WEP40)
2669                         pairwise = WPA_CIPHER_SUITE_WEP40;
2670                 else if (sm->pairwise == WPA_CIPHER_NONE)
2671                         pairwise = WPA_CIPHER_SUITE_NONE;
2672         } else if (sm->wpa == WPA_VERSION_WPA2) {
2673                 if (sm->pairwise == WPA_CIPHER_CCMP)
2674                         pairwise = RSN_CIPHER_SUITE_CCMP;
2675                 else if (sm->pairwise == WPA_CIPHER_TKIP)
2676                         pairwise = RSN_CIPHER_SUITE_TKIP;
2677                 else if (sm->pairwise == WPA_CIPHER_WEP104)
2678                         pairwise = RSN_CIPHER_SUITE_WEP104;
2679                 else if (sm->pairwise == WPA_CIPHER_WEP40)
2680                         pairwise = RSN_CIPHER_SUITE_WEP40;
2681                 else if (sm->pairwise == WPA_CIPHER_NONE)
2682                         pairwise = RSN_CIPHER_SUITE_NONE;
2683         } else
2684                 return 0;
2685
2686         ret = os_snprintf(
2687                 buf + len, buflen - len,
2688                 /* TODO: dot11RSNAStatsIndex */
2689                 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2690                 "dot11RSNAStatsVersion=1\n"
2691                 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2692                 /* TODO: dot11RSNAStatsTKIPICVErrors */
2693                 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2694                 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2695                 /* TODO: dot11RSNAStatsCCMPReplays */
2696                 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2697                 /* TODO: dot11RSNAStatsTKIPReplays */,
2698                 MAC2STR(sm->addr),
2699                 RSN_SUITE_ARG(pairwise),
2700                 sm->dot11RSNAStatsTKIPLocalMICFailures,
2701                 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2702         if (ret < 0 || (size_t) ret >= buflen - len)
2703                 return len;
2704         len += ret;
2705
2706         /* Private MIB */
2707         ret = os_snprintf(buf + len, buflen - len,
2708                           "hostapdWPAPTKState=%d\n"
2709                           "hostapdWPAPTKGroupState=%d\n",
2710                           sm->wpa_ptk_state,
2711                           sm->wpa_ptk_group_state);
2712         if (ret < 0 || (size_t) ret >= buflen - len)
2713                 return len;
2714         len += ret;
2715
2716         return len;
2717 }
2718
2719
2720 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2721 {
2722         if (wpa_auth)
2723                 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2724 }
2725
2726
2727 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2728 {
2729         return sm && sm->pairwise_set;
2730 }
2731
2732
2733 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2734 {
2735         return sm->pairwise;
2736 }
2737
2738
2739 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2740 {
2741         if (sm == NULL)
2742                 return -1;
2743         return sm->wpa_key_mgmt;
2744 }
2745
2746
2747 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2748 {
2749         if (sm == NULL)
2750                 return 0;
2751         return sm->wpa;
2752 }
2753
2754
2755 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2756                              struct rsn_pmksa_cache_entry *entry)
2757 {
2758         if (sm == NULL || sm->pmksa != entry)
2759                 return -1;
2760         sm->pmksa = NULL;
2761         return 0;
2762 }
2763
2764
2765 struct rsn_pmksa_cache_entry *
2766 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2767 {
2768         return sm ? sm->pmksa : NULL;
2769 }
2770
2771
2772 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2773 {
2774         if (sm)
2775                 sm->dot11RSNAStatsTKIPLocalMICFailures++;
2776 }
2777
2778
2779 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2780 {
2781         if (wpa_auth == NULL)
2782                 return NULL;
2783         *len = wpa_auth->wpa_ie_len;
2784         return wpa_auth->wpa_ie;
2785 }
2786
2787
2788 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2789                        int session_timeout, struct eapol_state_machine *eapol)
2790 {
2791         if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2792             sm->wpa_auth->conf.disable_pmksa_caching)
2793                 return -1;
2794
2795         if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2796                                  sm->wpa_auth->addr, sm->addr, session_timeout,
2797                                  eapol, sm->wpa_key_mgmt))
2798                 return 0;
2799
2800         return -1;
2801 }
2802
2803
2804 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2805                                const u8 *pmk, size_t len, const u8 *sta_addr,
2806                                int session_timeout,
2807                                struct eapol_state_machine *eapol)
2808 {
2809         if (wpa_auth == NULL)
2810                 return -1;
2811
2812         if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2813                                  sta_addr, session_timeout, eapol,
2814                                  WPA_KEY_MGMT_IEEE8021X))
2815                 return 0;
2816
2817         return -1;
2818 }
2819
2820
2821 static struct wpa_group *
2822 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2823 {
2824         struct wpa_group *group;
2825
2826         if (wpa_auth == NULL || wpa_auth->group == NULL)
2827                 return NULL;
2828
2829         wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2830                    vlan_id);
2831         group = wpa_group_init(wpa_auth, vlan_id, 0);
2832         if (group == NULL)
2833                 return NULL;
2834
2835         group->next = wpa_auth->group->next;
2836         wpa_auth->group->next = group;
2837
2838         return group;
2839 }
2840
2841
2842 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
2843 {
2844         struct wpa_group *group;
2845
2846         if (sm == NULL || sm->wpa_auth == NULL)
2847                 return 0;
2848
2849         group = sm->wpa_auth->group;
2850         while (group) {
2851                 if (group->vlan_id == vlan_id)
2852                         break;
2853                 group = group->next;
2854         }
2855
2856         if (group == NULL) {
2857                 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
2858                 if (group == NULL)
2859                         return -1;
2860         }
2861
2862         if (sm->group == group)
2863                 return 0;
2864
2865         wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
2866                    "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
2867
2868         sm->group = group;
2869         return 0;
2870 }
2871
2872
2873 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
2874                                   struct wpa_state_machine *sm, int ack)
2875 {
2876         if (wpa_auth == NULL || sm == NULL)
2877                 return;
2878         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
2879                    " ack=%d", MAC2STR(sm->addr), ack);
2880         if (sm->pending_1_of_4_timeout && ack) {
2881                 /*
2882                  * Some deployed supplicant implementations update their SNonce
2883                  * for each EAPOL-Key 2/4 message even within the same 4-way
2884                  * handshake and then fail to use the first SNonce when
2885                  * deriving the PTK. This results in unsuccessful 4-way
2886                  * handshake whenever the relatively short initial timeout is
2887                  * reached and EAPOL-Key 1/4 is retransmitted. Try to work
2888                  * around this by increasing the timeout now that we know that
2889                  * the station has received the frame.
2890                  */
2891                 int timeout_ms = eapol_key_timeout_subseq;
2892                 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
2893                            "timeout by %u ms because of acknowledged frame",
2894                            timeout_ms);
2895                 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
2896                 eloop_register_timeout(timeout_ms / 1000,
2897                                        (timeout_ms % 1000) * 1000,
2898                                        wpa_send_eapol_timeout, wpa_auth, sm);
2899         }
2900 }