contrib/wpa/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 software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "utils/state_machine.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "crypto/aes_wrap.h"
  16 #include "crypto/crypto.h"
  17 #include "crypto/sha1.h"
  18 #include "crypto/sha256.h"
  19 #include "crypto/random.h"
  20 #include "eapol_auth/eapol_auth_sm.h"
  21 #include "ap_config.h"
  22 #include "ieee802_11.h"
  23 #include "wpa_auth.h"
  24 #include "pmksa_cache_auth.h"
  25 #include "wpa_auth_i.h"
  26 #include "wpa_auth_ie.h"
  27
  28 #define STATE_MACHINE_DATA struct wpa_state_machine
  29 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
  30 #define STATE_MACHINE_ADDR sm->addr
  31
  32
  33 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
  34 static int wpa_sm_step(struct wpa_state_machine *sm);
  35 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
  36 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
  37 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
  38                               struct wpa_group *group);
  39 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
  40 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
  41                           struct wpa_group *group);
  42 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
  43                                        struct wpa_group *group);
  44
  45 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
  46 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
  47 static const u32 eapol_key_timeout_first = 100; /* ms */
  48 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
  49 static const u32 eapol_key_timeout_first_group = 500; /* ms */
  50
  51 /* TODO: make these configurable */
  52 static const int dot11RSNAConfigPMKLifetime = 43200;
  53 static const int dot11RSNAConfigPMKReauthThreshold = 70;
  54 static const int dot11RSNAConfigSATimeout = 60;
  55
  56
  57 static inline int wpa_auth_mic_failure_report(
  58         struct wpa_authenticator *wpa_auth, const u8 *addr)
  59 {
  60         if (wpa_auth->cb.mic_failure_report)
  61                 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
  62         return 0;
  63 }
  64
  65
  66 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
  67                                       const u8 *addr, wpa_eapol_variable var,
  68                                       int value)
  69 {
  70         if (wpa_auth->cb.set_eapol)
  71                 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
  72 }
  73
  74
  75 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
  76                                      const u8 *addr, wpa_eapol_variable var)
  77 {
  78         if (wpa_auth->cb.get_eapol == NULL)
  79                 return -1;
  80         return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
  81 }
  82
  83
  84 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
  85                                           const u8 *addr, const u8 *prev_psk)
  86 {
  87         if (wpa_auth->cb.get_psk == NULL)
  88                 return NULL;
  89         return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk);
  90 }
  91
  92
  93 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
  94                                    const u8 *addr, u8 *msk, size_t *len)
  95 {
  96         if (wpa_auth->cb.get_msk == NULL)
  97                 return -1;
  98         return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
  99 }
 100
 101
 102 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
 103                                    int vlan_id,
 104                                    enum wpa_alg alg, const u8 *addr, int idx,
 105                                    u8 *key, size_t key_len)
 106 {
 107         if (wpa_auth->cb.set_key == NULL)
 108                 return -1;
 109         return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
 110                                     key, key_len);
 111 }
 112
 113
 114 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
 115                                       const u8 *addr, int idx, u8 *seq)
 116 {
 117         if (wpa_auth->cb.get_seqnum == NULL)
 118                 return -1;
 119         return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
 120 }
 121
 122
 123 static inline int
 124 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
 125                     const u8 *data, size_t data_len, int encrypt)
 126 {
 127         if (wpa_auth->cb.send_eapol == NULL)
 128                 return -1;
 129         return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
 130                                        encrypt);
 131 }
 132
 133
 134 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
 135                           int (*cb)(struct wpa_state_machine *sm, void *ctx),
 136                           void *cb_ctx)
 137 {
 138         if (wpa_auth->cb.for_each_sta == NULL)
 139                 return 0;
 140         return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
 141 }
 142
 143
 144 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
 145                            int (*cb)(struct wpa_authenticator *a, void *ctx),
 146                            void *cb_ctx)
 147 {
 148         if (wpa_auth->cb.for_each_auth == NULL)
 149                 return 0;
 150         return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
 151 }
 152
 153
 154 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
 155                      logger_level level, const char *txt)
 156 {
 157         if (wpa_auth->cb.logger == NULL)
 158                 return;
 159         wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
 160 }
 161
 162
 163 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
 164                       logger_level level, const char *fmt, ...)
 165 {
 166         char *format;
 167         int maxlen;
 168         va_list ap;
 169
 170         if (wpa_auth->cb.logger == NULL)
 171                 return;
 172
 173         maxlen = os_strlen(fmt) + 100;
 174         format = os_malloc(maxlen);
 175         if (!format)
 176                 return;
 177
 178         va_start(ap, fmt);
 179         vsnprintf(format, maxlen, fmt, ap);
 180         va_end(ap);
 181
 182         wpa_auth_logger(wpa_auth, addr, level, format);
 183
 184         os_free(format);
 185 }
 186
 187
 188 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
 189                                const u8 *addr)
 190 {
 191         if (wpa_auth->cb.disconnect == NULL)
 192                 return;
 193         wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
 194         wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
 195                                 WLAN_REASON_PREV_AUTH_NOT_VALID);
 196 }
 197
 198
 199 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
 200 {
 201         int ret = 0;
 202 #ifdef CONFIG_IEEE80211R
 203         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
 204                 ret = 1;
 205 #endif /* CONFIG_IEEE80211R */
 206 #ifdef CONFIG_IEEE80211W
 207         if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
 208                 ret = 1;
 209 #endif /* CONFIG_IEEE80211W */
 210         return ret;
 211 }
 212
 213
 214 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
 215 {
 216         struct wpa_authenticator *wpa_auth = eloop_ctx;
 217
 218         if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
 219                 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
 220                            "initialization.");
 221         } else {
 222                 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
 223                 wpa_hexdump_key(MSG_DEBUG, "GMK",
 224                                 wpa_auth->group->GMK, WPA_GMK_LEN);
 225         }
 226
 227         if (wpa_auth->conf.wpa_gmk_rekey) {
 228                 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
 229                                        wpa_rekey_gmk, wpa_auth, NULL);
 230         }
 231 }
 232
 233
 234 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
 235 {
 236         struct wpa_authenticator *wpa_auth = eloop_ctx;
 237         struct wpa_group *group;
 238
 239         wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
 240         for (group = wpa_auth->group; group; group = group->next) {
 241                 group->GTKReKey = TRUE;
 242                 do {
 243                         group->changed = FALSE;
 244                         wpa_group_sm_step(wpa_auth, group);
 245                 } while (group->changed);
 246         }
 247
 248         if (wpa_auth->conf.wpa_group_rekey) {
 249                 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
 250                                        0, wpa_rekey_gtk, wpa_auth, NULL);
 251         }
 252 }
 253
 254
 255 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
 256 {
 257         struct wpa_authenticator *wpa_auth = eloop_ctx;
 258         struct wpa_state_machine *sm = timeout_ctx;
 259
 260         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
 261         wpa_request_new_ptk(sm);
 262         wpa_sm_step(sm);
 263 }
 264
 265
 266 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
 267 {
 268         if (sm->pmksa == ctx)
 269                 sm->pmksa = NULL;
 270         return 0;
 271 }
 272
 273
 274 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
 275                                    void *ctx)
 276 {
 277         struct wpa_authenticator *wpa_auth = ctx;
 278         wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
 279 }
 280
 281
 282 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
 283                                           struct wpa_group *group)
 284 {
 285         u8 buf[ETH_ALEN + 8 + sizeof(group)];
 286         u8 rkey[32];
 287
 288         if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
 289                 return -1;
 290         wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
 291
 292         /*
 293          * Counter = PRF-256(Random number, "Init Counter",
 294          *                   Local MAC Address || Time)
 295          */
 296         os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
 297         wpa_get_ntp_timestamp(buf + ETH_ALEN);
 298         os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group));
 299         if (random_get_bytes(rkey, sizeof(rkey)) < 0)
 300                 return -1;
 301
 302         if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
 303                      group->Counter, WPA_NONCE_LEN) < 0)
 304                 return -1;
 305         wpa_hexdump_key(MSG_DEBUG, "Key Counter",
 306                         group->Counter, WPA_NONCE_LEN);
 307
 308         return 0;
 309 }
 310
 311
 312 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
 313                                          int vlan_id, int delay_init)
 314 {
 315         struct wpa_group *group;
 316
 317         group = os_zalloc(sizeof(struct wpa_group));
 318         if (group == NULL)
 319                 return NULL;
 320
 321         group->GTKAuthenticator = TRUE;
 322         group->vlan_id = vlan_id;
 323         group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
 324
 325         if (random_pool_ready() != 1) {
 326                 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
 327                            "for secure operations - update keys later when "
 328                            "the first station connects");
 329         }
 330
 331         /*
 332          * Set initial GMK/Counter value here. The actual values that will be
 333          * used in negotiations will be set once the first station tries to
 334          * connect. This allows more time for collecting additional randomness
 335          * on embedded devices.
 336          */
 337         if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
 338                 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
 339                            "initialization.");
 340                 os_free(group);
 341                 return NULL;
 342         }
 343
 344         group->GInit = TRUE;
 345         if (delay_init) {
 346                 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
 347                            "until Beacon frames have been configured");
 348                 /* Initialization is completed in wpa_init_keys(). */
 349         } else {
 350                 wpa_group_sm_step(wpa_auth, group);
 351                 group->GInit = FALSE;
 352                 wpa_group_sm_step(wpa_auth, group);
 353         }
 354
 355         return group;
 356 }
 357
 358
 359 /**
 360  * wpa_init - Initialize WPA authenticator
 361  * @addr: Authenticator address
 362  * @conf: Configuration for WPA authenticator
 363  * @cb: Callback functions for WPA authenticator
 364  * Returns: Pointer to WPA authenticator data or %NULL on failure
 365  */
 366 struct wpa_authenticator * wpa_init(const u8 *addr,
 367                                     struct wpa_auth_config *conf,
 368                                     struct wpa_auth_callbacks *cb)
 369 {
 370         struct wpa_authenticator *wpa_auth;
 371
 372         wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
 373         if (wpa_auth == NULL)
 374                 return NULL;
 375         os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
 376         os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
 377         os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
 378
 379         if (wpa_auth_gen_wpa_ie(wpa_auth)) {
 380                 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
 381                 os_free(wpa_auth);
 382                 return NULL;
 383         }
 384
 385         wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
 386         if (wpa_auth->group == NULL) {
 387                 os_free(wpa_auth->wpa_ie);
 388                 os_free(wpa_auth);
 389                 return NULL;
 390         }
 391
 392         wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
 393                                                 wpa_auth);
 394         if (wpa_auth->pmksa == NULL) {
 395                 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
 396                 os_free(wpa_auth->wpa_ie);
 397                 os_free(wpa_auth);
 398                 return NULL;
 399         }
 400
 401 #ifdef CONFIG_IEEE80211R
 402         wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
 403         if (wpa_auth->ft_pmk_cache == NULL) {
 404                 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
 405                 os_free(wpa_auth->wpa_ie);
 406                 pmksa_cache_auth_deinit(wpa_auth->pmksa);
 407                 os_free(wpa_auth);
 408                 return NULL;
 409         }
 410 #endif /* CONFIG_IEEE80211R */
 411
 412         if (wpa_auth->conf.wpa_gmk_rekey) {
 413                 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
 414                                        wpa_rekey_gmk, wpa_auth, NULL);
 415         }
 416
 417         if (wpa_auth->conf.wpa_group_rekey) {
 418                 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
 419                                        wpa_rekey_gtk, wpa_auth, NULL);
 420         }
 421
 422         return wpa_auth;
 423 }
 424
 425
 426 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
 427 {
 428         struct wpa_group *group = wpa_auth->group;
 429
 430         wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
 431                    "keys");
 432         wpa_group_sm_step(wpa_auth, group);
 433         group->GInit = FALSE;
 434         wpa_group_sm_step(wpa_auth, group);
 435         return 0;
 436 }
 437
 438
 439 /**
 440  * wpa_deinit - Deinitialize WPA authenticator
 441  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
 442  */
 443 void wpa_deinit(struct wpa_authenticator *wpa_auth)
 444 {
 445         struct wpa_group *group, *prev;
 446
 447         eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
 448         eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
 449
 450 #ifdef CONFIG_PEERKEY
 451         while (wpa_auth->stsl_negotiations)
 452                 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
 453 #endif /* CONFIG_PEERKEY */
 454
 455         pmksa_cache_auth_deinit(wpa_auth->pmksa);
 456
 457 #ifdef CONFIG_IEEE80211R
 458         wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
 459         wpa_auth->ft_pmk_cache = NULL;
 460 #endif /* CONFIG_IEEE80211R */
 461
 462         os_free(wpa_auth->wpa_ie);
 463
 464         group = wpa_auth->group;
 465         while (group) {
 466                 prev = group;
 467                 group = group->next;
 468                 os_free(prev);
 469         }
 470
 471         os_free(wpa_auth);
 472 }
 473
 474
 475 /**
 476  * wpa_reconfig - Update WPA authenticator configuration
 477  * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
 478  * @conf: Configuration for WPA authenticator
 479  */
 480 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
 481                  struct wpa_auth_config *conf)
 482 {
 483         struct wpa_group *group;
 484         if (wpa_auth == NULL)
 485                 return 0;
 486
 487         os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
 488         if (wpa_auth_gen_wpa_ie(wpa_auth)) {
 489                 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
 490                 return -1;
 491         }
 492
 493         /*
 494          * Reinitialize GTK to make sure it is suitable for the new
 495          * configuration.
 496          */
 497         group = wpa_auth->group;
 498         group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
 499         group->GInit = TRUE;
 500         wpa_group_sm_step(wpa_auth, group);
 501         group->GInit = FALSE;
 502         wpa_group_sm_step(wpa_auth, group);
 503
 504         return 0;
 505 }
 506
 507
 508 struct wpa_state_machine *
 509 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr)
 510 {
 511         struct wpa_state_machine *sm;
 512
 513         sm = os_zalloc(sizeof(struct wpa_state_machine));
 514         if (sm == NULL)
 515                 return NULL;
 516         os_memcpy(sm->addr, addr, ETH_ALEN);
 517
 518         sm->wpa_auth = wpa_auth;
 519         sm->group = wpa_auth->group;
 520
 521         return sm;
 522 }
 523
 524
 525 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
 526                             struct wpa_state_machine *sm)
 527 {
 528         if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
 529                 return -1;
 530
 531 #ifdef CONFIG_IEEE80211R
 532         if (sm->ft_completed) {
 533                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
 534                                 "FT authentication already completed - do not "
 535                                 "start 4-way handshake");
 536                 return 0;
 537         }
 538 #endif /* CONFIG_IEEE80211R */
 539
 540         if (sm->started) {
 541                 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
 542                 sm->ReAuthenticationRequest = TRUE;
 543                 return wpa_sm_step(sm);
 544         }
 545
 546         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
 547                         "start authentication");
 548         sm->started = 1;
 549
 550         sm->Init = TRUE;
 551         if (wpa_sm_step(sm) == 1)
 552                 return 1; /* should not really happen */
 553         sm->Init = FALSE;
 554         sm->AuthenticationRequest = TRUE;
 555         return wpa_sm_step(sm);
 556 }
 557
 558
 559 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
 560 {
 561         /* WPA/RSN was not used - clear WPA state. This is needed if the STA
 562          * reassociates back to the same AP while the previous entry for the
 563          * STA has not yet been removed. */
 564         if (sm == NULL)
 565                 return;
 566
 567         sm->wpa_key_mgmt = 0;
 568 }
 569
 570
 571 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
 572 {
 573         if (sm->GUpdateStationKeys) {
 574                 sm->group->GKeyDoneStations--;
 575                 sm->GUpdateStationKeys = FALSE;
 576         }
 577 #ifdef CONFIG_IEEE80211R
 578         os_free(sm->assoc_resp_ftie);
 579 #endif /* CONFIG_IEEE80211R */
 580         os_free(sm->last_rx_eapol_key);
 581         os_free(sm->wpa_ie);
 582         os_free(sm);
 583 }
 584
 585
 586 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
 587 {
 588         if (sm == NULL)
 589                 return;
 590
 591         if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
 592                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
 593                                 "strict rekeying - force GTK rekey since STA "
 594                                 "is leaving");
 595                 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
 596                 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
 597                                        NULL);
 598         }
 599
 600         eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
 601         sm->pending_1_of_4_timeout = 0;
 602         eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
 603         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
 604         if (sm->in_step_loop) {
 605                 /* Must not free state machine while wpa_sm_step() is running.
 606                  * Freeing will be completed in the end of wpa_sm_step(). */
 607                 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
 608                            "machine deinit for " MACSTR, MAC2STR(sm->addr));
 609                 sm->pending_deinit = 1;
 610         } else
 611                 wpa_free_sta_sm(sm);
 612 }
 613
 614
 615 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
 616 {
 617         if (sm == NULL)
 618                 return;
 619
 620         sm->PTKRequest = TRUE;
 621         sm->PTK_valid = 0;
 622 }
 623
 624
 625 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
 626                                     const u8 *replay_counter)
 627 {
 628         int i;
 629         for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
 630                 if (!ctr[i].valid)
 631                         break;
 632                 if (os_memcmp(replay_counter, ctr[i].counter,
 633                               WPA_REPLAY_COUNTER_LEN) == 0)
 634                         return 1;
 635         }
 636         return 0;
 637 }
 638
 639
 640 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
 641                                             const u8 *replay_counter)
 642 {
 643         int i;
 644         for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
 645                 if (ctr[i].valid &&
 646                     (replay_counter == NULL ||
 647                      os_memcmp(replay_counter, ctr[i].counter,
 648                                WPA_REPLAY_COUNTER_LEN) == 0))
 649                         ctr[i].valid = FALSE;
 650         }
 651 }
 652
 653
 654 #ifdef CONFIG_IEEE80211R
 655 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
 656                                struct wpa_state_machine *sm,
 657                                struct wpa_eapol_ie_parse *kde)
 658 {
 659         struct wpa_ie_data ie;
 660         struct rsn_mdie *mdie;
 661
 662         if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
 663             ie.num_pmkid != 1 || ie.pmkid == NULL) {
 664                 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
 665                            "FT 4-way handshake message 2/4");
 666                 return -1;
 667         }
 668
 669         os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
 670         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
 671                     sm->sup_pmk_r1_name, PMKID_LEN);
 672
 673         if (!kde->mdie || !kde->ftie) {
 674                 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
 675                            "message 2/4", kde->mdie ? "FTIE" : "MDIE");
 676                 return -1;
 677         }
 678
 679         mdie = (struct rsn_mdie *) (kde->mdie + 2);
 680         if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
 681             os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
 682                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 683                 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
 684                 return -1;
 685         }
 686
 687         if (sm->assoc_resp_ftie &&
 688             (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
 689              os_memcmp(kde->ftie, sm->assoc_resp_ftie,
 690                        2 + sm->assoc_resp_ftie[1]) != 0)) {
 691                 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
 692                 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
 693                             kde->ftie, kde->ftie_len);
 694                 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
 695                             sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
 696                 return -1;
 697         }
 698
 699         return 0;
 700 }
 701 #endif /* CONFIG_IEEE80211R */
 702
 703
 704 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
 705                                     struct wpa_state_machine *sm, int group)
 706 {
 707         /* Supplicant reported a Michael MIC error */
 708         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 709                          "received EAPOL-Key Error Request "
 710                          "(STA detected Michael MIC failure (group=%d))",
 711                          group);
 712
 713         if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
 714                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 715                                 "ignore Michael MIC failure report since "
 716                                 "group cipher is not TKIP");
 717         } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
 718                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 719                                 "ignore Michael MIC failure report since "
 720                                 "pairwise cipher is not TKIP");
 721         } else {
 722                 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
 723                         return 1; /* STA entry was removed */
 724                 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
 725                 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
 726         }
 727
 728         /*
 729          * Error report is not a request for a new key handshake, but since
 730          * Authenticator may do it, let's change the keys now anyway.
 731          */
 732         wpa_request_new_ptk(sm);
 733         return 0;
 734 }
 735
 736
 737 void wpa_receive(struct wpa_authenticator *wpa_auth,
 738                  struct wpa_state_machine *sm,
 739                  u8 *data, size_t data_len)
 740 {
 741         struct ieee802_1x_hdr *hdr;
 742         struct wpa_eapol_key *key;
 743         u16 key_info, key_data_length;
 744         enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
 745                SMK_M1, SMK_M3, SMK_ERROR } msg;
 746         char *msgtxt;
 747         struct wpa_eapol_ie_parse kde;
 748         int ft;
 749         const u8 *eapol_key_ie;
 750         size_t eapol_key_ie_len;
 751
 752         if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
 753                 return;
 754
 755         if (data_len < sizeof(*hdr) + sizeof(*key))
 756                 return;
 757
 758         hdr = (struct ieee802_1x_hdr *) data;
 759         key = (struct wpa_eapol_key *) (hdr + 1);
 760         key_info = WPA_GET_BE16(key->key_info);
 761         key_data_length = WPA_GET_BE16(key->key_data_length);
 762         wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
 763                    " key_info=0x%x type=%u key_data_length=%u",
 764                    MAC2STR(sm->addr), key_info, key->type, key_data_length);
 765         if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
 766                 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
 767                            "key_data overflow (%d > %lu)",
 768                            key_data_length,
 769                            (unsigned long) (data_len - sizeof(*hdr) -
 770                                             sizeof(*key)));
 771                 return;
 772         }
 773
 774         if (sm->wpa == WPA_VERSION_WPA2) {
 775                 if (key->type == EAPOL_KEY_TYPE_WPA) {
 776                         /*
 777                          * Some deployed station implementations seem to send
 778                          * msg 4/4 with incorrect type value in WPA2 mode.
 779                          */
 780                         wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
 781                                    "with unexpected WPA type in RSN mode");
 782                 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
 783                         wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
 784                                    "unexpected type %d in RSN mode",
 785                                    key->type);
 786                         return;
 787                 }
 788         } else {
 789                 if (key->type != EAPOL_KEY_TYPE_WPA) {
 790                         wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
 791                                    "unexpected type %d in WPA mode",
 792                                    key->type);
 793                         return;
 794                 }
 795         }
 796
 797         wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
 798                     WPA_NONCE_LEN);
 799         wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
 800                     key->replay_counter, WPA_REPLAY_COUNTER_LEN);
 801
 802         /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
 803          * are set */
 804
 805         if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
 806             (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
 807                 if (key_info & WPA_KEY_INFO_ERROR) {
 808                         msg = SMK_ERROR;
 809                         msgtxt = "SMK Error";
 810                 } else {
 811                         msg = SMK_M1;
 812                         msgtxt = "SMK M1";
 813                 }
 814         } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
 815                 msg = SMK_M3;
 816                 msgtxt = "SMK M3";
 817         } else if (key_info & WPA_KEY_INFO_REQUEST) {
 818                 msg = REQUEST;
 819                 msgtxt = "Request";
 820         } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
 821                 msg = GROUP_2;
 822                 msgtxt = "2/2 Group";
 823         } else if (key_data_length == 0) {
 824                 msg = PAIRWISE_4;
 825                 msgtxt = "4/4 Pairwise";
 826         } else {
 827                 msg = PAIRWISE_2;
 828                 msgtxt = "2/4 Pairwise";
 829         }
 830
 831         /* TODO: key_info type validation for PeerKey */
 832         if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
 833             msg == GROUP_2) {
 834                 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
 835                 if (sm->pairwise == WPA_CIPHER_CCMP ||
 836                     sm->pairwise == WPA_CIPHER_GCMP) {
 837                         if (wpa_use_aes_cmac(sm) &&
 838                             ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
 839                                 wpa_auth_logger(wpa_auth, sm->addr,
 840                                                 LOGGER_WARNING,
 841                                                 "advertised support for "
 842                                                 "AES-128-CMAC, but did not "
 843                                                 "use it");
 844                                 return;
 845                         }
 846
 847                         if (!wpa_use_aes_cmac(sm) &&
 848                             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
 849                                 wpa_auth_logger(wpa_auth, sm->addr,
 850                                                 LOGGER_WARNING,
 851                                                 "did not use HMAC-SHA1-AES "
 852                                                 "with CCMP/GCMP");
 853                                 return;
 854                         }
 855                 }
 856         }
 857
 858         if (key_info & WPA_KEY_INFO_REQUEST) {
 859                 if (sm->req_replay_counter_used &&
 860                     os_memcmp(key->replay_counter, sm->req_replay_counter,
 861                               WPA_REPLAY_COUNTER_LEN) <= 0) {
 862                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
 863                                         "received EAPOL-Key request with "
 864                                         "replayed counter");
 865                         return;
 866                 }
 867         }
 868
 869         if (!(key_info & WPA_KEY_INFO_REQUEST) &&
 870             !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
 871                 int i;
 872
 873                 if (msg == PAIRWISE_2 &&
 874                     wpa_replay_counter_valid(sm->prev_key_replay,
 875                                              key->replay_counter) &&
 876                     sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
 877                     os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
 878                 {
 879                         /*
 880                          * Some supplicant implementations (e.g., Windows XP
 881                          * WZC) update SNonce for each EAPOL-Key 2/4. This
 882                          * breaks the workaround on accepting any of the
 883                          * pending requests, so allow the SNonce to be updated
 884                          * even if we have already sent out EAPOL-Key 3/4.
 885                          */
 886                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
 887                                          "Process SNonce update from STA "
 888                                          "based on retransmitted EAPOL-Key "
 889                                          "1/4");
 890                         sm->update_snonce = 1;
 891                         wpa_replay_counter_mark_invalid(sm->prev_key_replay,
 892                                                         key->replay_counter);
 893                         goto continue_processing;
 894                 }
 895
 896                 if (msg == PAIRWISE_2 &&
 897                     wpa_replay_counter_valid(sm->prev_key_replay,
 898                                              key->replay_counter) &&
 899                     sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
 900                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
 901                                          "ignore retransmitted EAPOL-Key %s - "
 902                                          "SNonce did not change", msgtxt);
 903                 } else {
 904                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
 905                                          "received EAPOL-Key %s with "
 906                                          "unexpected replay counter", msgtxt);
 907                 }
 908                 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
 909                         if (!sm->key_replay[i].valid)
 910                                 break;
 911                         wpa_hexdump(MSG_DEBUG, "pending replay counter",
 912                                     sm->key_replay[i].counter,
 913                                     WPA_REPLAY_COUNTER_LEN);
 914                 }
 915                 wpa_hexdump(MSG_DEBUG, "received replay counter",
 916                             key->replay_counter, WPA_REPLAY_COUNTER_LEN);
 917                 return;
 918         }
 919
 920 continue_processing:
 921         switch (msg) {
 922         case PAIRWISE_2:
 923                 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
 924                     sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
 925                     (!sm->update_snonce ||
 926                      sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
 927                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 928                                          "received EAPOL-Key msg 2/4 in "
 929                                          "invalid state (%d) - dropped",
 930                                          sm->wpa_ptk_state);
 931                         return;
 932                 }
 933                 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
 934                 if (sm->group->reject_4way_hs_for_entropy) {
 935                         /*
 936                          * The system did not have enough entropy to generate
 937                          * strong random numbers. Reject the first 4-way
 938                          * handshake(s) and collect some entropy based on the
 939                          * information from it. Once enough entropy is
 940                          * available, the next atempt will trigger GMK/Key
 941                          * Counter update and the station will be allowed to
 942                          * continue.
 943                          */
 944                         wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
 945                                    "collect more entropy for random number "
 946                                    "generation");
 947                         random_mark_pool_ready();
 948                         wpa_sta_disconnect(wpa_auth, sm->addr);
 949                         return;
 950                 }
 951                 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
 952                                       &kde) < 0) {
 953                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 954                                          "received EAPOL-Key msg 2/4 with "
 955                                          "invalid Key Data contents");
 956                         return;
 957                 }
 958                 if (kde.rsn_ie) {
 959                         eapol_key_ie = kde.rsn_ie;
 960                         eapol_key_ie_len = kde.rsn_ie_len;
 961                 } else {
 962                         eapol_key_ie = kde.wpa_ie;
 963                         eapol_key_ie_len = kde.wpa_ie_len;
 964                 }
 965                 ft = sm->wpa == WPA_VERSION_WPA2 &&
 966                         wpa_key_mgmt_ft(sm->wpa_key_mgmt);
 967                 if (sm->wpa_ie == NULL ||
 968                     wpa_compare_rsn_ie(ft,
 969                                        sm->wpa_ie, sm->wpa_ie_len,
 970                                        eapol_key_ie, eapol_key_ie_len)) {
 971                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
 972                                         "WPA IE from (Re)AssocReq did not "
 973                                         "match with msg 2/4");
 974                         if (sm->wpa_ie) {
 975                                 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
 976                                             sm->wpa_ie, sm->wpa_ie_len);
 977                         }
 978                         wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
 979                                     eapol_key_ie, eapol_key_ie_len);
 980                         /* MLME-DEAUTHENTICATE.request */
 981                         wpa_sta_disconnect(wpa_auth, sm->addr);
 982                         return;
 983                 }
 984 #ifdef CONFIG_IEEE80211R
 985                 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
 986                         wpa_sta_disconnect(wpa_auth, sm->addr);
 987                         return;
 988                 }
 989 #endif /* CONFIG_IEEE80211R */
 990                 break;
 991         case PAIRWISE_4:
 992                 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
 993                     !sm->PTK_valid) {
 994                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
 995                                          "received EAPOL-Key msg 4/4 in "
 996                                          "invalid state (%d) - dropped",
 997                                          sm->wpa_ptk_state);
 998                         return;
 999                 }
1000                 break;
1001         case GROUP_2:
1002                 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1003                     || !sm->PTK_valid) {
1004                         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1005                                          "received EAPOL-Key msg 2/2 in "
1006                                          "invalid state (%d) - dropped",
1007                                          sm->wpa_ptk_group_state);
1008                         return;
1009                 }
1010                 break;
1011 #ifdef CONFIG_PEERKEY
1012         case SMK_M1:
1013         case SMK_M3:
1014         case SMK_ERROR:
1015                 if (!wpa_auth->conf.peerkey) {
1016                         wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1017                                    "PeerKey use disabled - ignoring message");
1018                         return;
1019                 }
1020                 if (!sm->PTK_valid) {
1021                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1022                                         "received EAPOL-Key msg SMK in "
1023                                         "invalid state - dropped");
1024                         return;
1025                 }
1026                 break;
1027 #else /* CONFIG_PEERKEY */
1028         case SMK_M1:
1029         case SMK_M3:
1030         case SMK_ERROR:
1031                 return; /* STSL disabled - ignore SMK messages */
1032 #endif /* CONFIG_PEERKEY */
1033         case REQUEST:
1034                 break;
1035         }
1036
1037         wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1038                          "received EAPOL-Key frame (%s)", msgtxt);
1039
1040         if (key_info & WPA_KEY_INFO_ACK) {
1041                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1042                                 "received invalid EAPOL-Key: Key Ack set");
1043                 return;
1044         }
1045
1046         if (!(key_info & WPA_KEY_INFO_MIC)) {
1047                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1048                                 "received invalid EAPOL-Key: Key MIC not set");
1049                 return;
1050         }
1051
1052         sm->MICVerified = FALSE;
1053         if (sm->PTK_valid && !sm->update_snonce) {
1054                 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1055                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1056                                         "received EAPOL-Key with invalid MIC");
1057                         return;
1058                 }
1059                 sm->MICVerified = TRUE;
1060                 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1061                 sm->pending_1_of_4_timeout = 0;
1062         }
1063
1064         if (key_info & WPA_KEY_INFO_REQUEST) {
1065                 if (sm->MICVerified) {
1066                         sm->req_replay_counter_used = 1;
1067                         os_memcpy(sm->req_replay_counter, key->replay_counter,
1068                                   WPA_REPLAY_COUNTER_LEN);
1069                 } else {
1070                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1071                                         "received EAPOL-Key request with "
1072                                         "invalid MIC");
1073                         return;
1074                 }
1075
1076                 /*
1077                  * TODO: should decrypt key data field if encryption was used;
1078                  * even though MAC address KDE is not normally encrypted,
1079                  * supplicant is allowed to encrypt it.
1080                  */
1081                 if (msg == SMK_ERROR) {
1082 #ifdef CONFIG_PEERKEY
1083                         wpa_smk_error(wpa_auth, sm, key);
1084 #endif /* CONFIG_PEERKEY */
1085                         return;
1086                 } else if (key_info & WPA_KEY_INFO_ERROR) {
1087                         if (wpa_receive_error_report(
1088                                     wpa_auth, sm,
1089                                     !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1090                                 return; /* STA entry was removed */
1091                 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1092                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1093                                         "received EAPOL-Key Request for new "
1094                                         "4-Way Handshake");
1095                         wpa_request_new_ptk(sm);
1096 #ifdef CONFIG_PEERKEY
1097                 } else if (msg == SMK_M1) {
1098                         wpa_smk_m1(wpa_auth, sm, key);
1099 #endif /* CONFIG_PEERKEY */
1100                 } else if (key_data_length > 0 &&
1101                            wpa_parse_kde_ies((const u8 *) (key + 1),
1102                                              key_data_length, &kde) == 0 &&
1103                            kde.mac_addr) {
1104                 } else {
1105                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1106                                         "received EAPOL-Key Request for GTK "
1107                                         "rekeying");
1108                         eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1109                         wpa_rekey_gtk(wpa_auth, NULL);
1110                 }
1111         } else {
1112                 /* Do not allow the same key replay counter to be reused. */
1113                 wpa_replay_counter_mark_invalid(sm->key_replay,
1114                                                 key->replay_counter);
1115
1116                 if (msg == PAIRWISE_2) {
1117                         /*
1118                          * Maintain a copy of the pending EAPOL-Key frames in
1119                          * case the EAPOL-Key frame was retransmitted. This is
1120                          * needed to allow EAPOL-Key msg 2/4 reply to another
1121                          * pending msg 1/4 to update the SNonce to work around
1122                          * unexpected supplicant behavior.
1123                          */
1124                         os_memcpy(sm->prev_key_replay, sm->key_replay,
1125                                   sizeof(sm->key_replay));
1126                 } else {
1127                         os_memset(sm->prev_key_replay, 0,
1128                                   sizeof(sm->prev_key_replay));
1129                 }
1130
1131                 /*
1132                  * Make sure old valid counters are not accepted anymore and
1133                  * do not get copied again.
1134                  */
1135                 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1136         }
1137
1138 #ifdef CONFIG_PEERKEY
1139         if (msg == SMK_M3) {
1140                 wpa_smk_m3(wpa_auth, sm, key);
1141                 return;
1142         }
1143 #endif /* CONFIG_PEERKEY */
1144
1145         os_free(sm->last_rx_eapol_key);
1146         sm->last_rx_eapol_key = os_malloc(data_len);
1147         if (sm->last_rx_eapol_key == NULL)
1148                 return;
1149         os_memcpy(sm->last_rx_eapol_key, data, data_len);
1150         sm->last_rx_eapol_key_len = data_len;
1151
1152         sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1153         sm->EAPOLKeyReceived = TRUE;
1154         sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1155         sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1156         os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1157         wpa_sm_step(sm);
1158 }
1159
1160
1161 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1162                           const u8 *gnonce, u8 *gtk, size_t gtk_len)
1163 {
1164         u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1165         u8 *pos;
1166         int ret = 0;
1167
1168         /* GTK = PRF-X(GMK, "Group key expansion",
1169          *      AA || GNonce || Time || random data)
1170          * The example described in the IEEE 802.11 standard uses only AA and
1171          * GNonce as inputs here. Add some more entropy since this derivation
1172          * is done only at the Authenticator and as such, does not need to be
1173          * exactly same.
1174          */
1175         os_memcpy(data, addr, ETH_ALEN);
1176         os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1177         pos = data + ETH_ALEN + WPA_NONCE_LEN;
1178         wpa_get_ntp_timestamp(pos);
1179         pos += 8;
1180         if (random_get_bytes(pos, 16) < 0)
1181                 ret = -1;
1182
1183 #ifdef CONFIG_IEEE80211W
1184         sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1185 #else /* CONFIG_IEEE80211W */
1186         if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1187             < 0)
1188                 ret = -1;
1189 #endif /* CONFIG_IEEE80211W */
1190
1191         return ret;
1192 }
1193
1194
1195 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1196 {
1197         struct wpa_authenticator *wpa_auth = eloop_ctx;
1198         struct wpa_state_machine *sm = timeout_ctx;
1199
1200         sm->pending_1_of_4_timeout = 0;
1201         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1202         sm->TimeoutEvt = TRUE;
1203         wpa_sm_step(sm);
1204 }
1205
1206
1207 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1208                       struct wpa_state_machine *sm, int key_info,
1209                       const u8 *key_rsc, const u8 *nonce,
1210                       const u8 *kde, size_t kde_len,
1211                       int keyidx, int encr, int force_version)
1212 {
1213         struct ieee802_1x_hdr *hdr;
1214         struct wpa_eapol_key *key;
1215         size_t len;
1216         int alg;
1217         int key_data_len, pad_len = 0;
1218         u8 *buf, *pos;
1219         int version, pairwise;
1220         int i;
1221
1222         len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1223
1224         if (force_version)
1225                 version = force_version;
1226         else if (wpa_use_aes_cmac(sm))
1227                 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1228         else if (sm->pairwise != WPA_CIPHER_TKIP)
1229                 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1230         else
1231                 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1232
1233         pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1234
1235         wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1236                    "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1237                    "encr=%d)",
1238                    version,
1239                    (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1240                    (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1241                    (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1242                    (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1243                    pairwise, (unsigned long) kde_len, keyidx, encr);
1244
1245         key_data_len = kde_len;
1246
1247         if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1248              version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1249                 pad_len = key_data_len % 8;
1250                 if (pad_len)
1251                         pad_len = 8 - pad_len;
1252                 key_data_len += pad_len + 8;
1253         }
1254
1255         len += key_data_len;
1256
1257         hdr = os_zalloc(len);
1258         if (hdr == NULL)
1259                 return;
1260         hdr->version = wpa_auth->conf.eapol_version;
1261         hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1262         hdr->length = host_to_be16(len  - sizeof(*hdr));
1263         key = (struct wpa_eapol_key *) (hdr + 1);
1264
1265         key->type = sm->wpa == WPA_VERSION_WPA2 ?
1266                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1267         key_info |= version;
1268         if (encr && sm->wpa == WPA_VERSION_WPA2)
1269                 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1270         if (sm->wpa != WPA_VERSION_WPA2)
1271                 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1272         WPA_PUT_BE16(key->key_info, key_info);
1273
1274         alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1275         WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1276         if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1277                 WPA_PUT_BE16(key->key_length, 0);
1278
1279         /* FIX: STSL: what to use as key_replay_counter? */
1280         for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1281                 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1282                 os_memcpy(sm->key_replay[i].counter,
1283                           sm->key_replay[i - 1].counter,
1284                           WPA_REPLAY_COUNTER_LEN);
1285         }
1286         inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1287         os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1288                   WPA_REPLAY_COUNTER_LEN);
1289         sm->key_replay[0].valid = TRUE;
1290
1291         if (nonce)
1292                 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1293
1294         if (key_rsc)
1295                 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1296
1297         if (kde && !encr) {
1298                 os_memcpy(key + 1, kde, kde_len);
1299                 WPA_PUT_BE16(key->key_data_length, kde_len);
1300         } else if (encr && kde) {
1301                 buf = os_zalloc(key_data_len);
1302                 if (buf == NULL) {
1303                         os_free(hdr);
1304                         return;
1305                 }
1306                 pos = buf;
1307                 os_memcpy(pos, kde, kde_len);
1308                 pos += kde_len;
1309
1310                 if (pad_len)
1311                         *pos++ = 0xdd;
1312
1313                 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1314                                 buf, key_data_len);
1315                 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1316                     version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1317                         if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1318                                      (u8 *) (key + 1))) {
1319                                 os_free(hdr);
1320                                 os_free(buf);
1321                                 return;
1322                         }
1323                         WPA_PUT_BE16(key->key_data_length, key_data_len);
1324                 } else {
1325                         u8 ek[32];
1326                         os_memcpy(key->key_iv,
1327                                   sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1328                         inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1329                         os_memcpy(ek, key->key_iv, 16);
1330                         os_memcpy(ek + 16, sm->PTK.kek, 16);
1331                         os_memcpy(key + 1, buf, key_data_len);
1332                         rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1333                         WPA_PUT_BE16(key->key_data_length, key_data_len);
1334                 }
1335                 os_free(buf);
1336         }
1337
1338         if (key_info & WPA_KEY_INFO_MIC) {
1339                 if (!sm->PTK_valid) {
1340                         wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1341                                         "PTK not valid when sending EAPOL-Key "
1342                                         "frame");
1343                         os_free(hdr);
1344                         return;
1345                 }
1346                 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1347                                   key->key_mic);
1348         }
1349
1350         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1351                            1);
1352         wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1353                             sm->pairwise_set);
1354         os_free(hdr);
1355 }
1356
1357
1358 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1359                            struct wpa_state_machine *sm, int key_info,
1360                            const u8 *key_rsc, const u8 *nonce,
1361                            const u8 *kde, size_t kde_len,
1362                            int keyidx, int encr)
1363 {
1364         int timeout_ms;
1365         int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1366         int ctr;
1367
1368         if (sm == NULL)
1369                 return;
1370
1371         __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1372                          keyidx, encr, 0);
1373
1374         ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1375         if (ctr == 1 && wpa_auth->conf.tx_status)
1376                 timeout_ms = pairwise ? eapol_key_timeout_first :
1377                         eapol_key_timeout_first_group;
1378         else
1379                 timeout_ms = eapol_key_timeout_subseq;
1380         if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1381                 sm->pending_1_of_4_timeout = 1;
1382         wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1383                    "counter %d)", timeout_ms, ctr);
1384         eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1385                                wpa_send_eapol_timeout, wpa_auth, sm);
1386 }
1387
1388
1389 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1390 {
1391         struct ieee802_1x_hdr *hdr;
1392         struct wpa_eapol_key *key;
1393         u16 key_info;
1394         int ret = 0;
1395         u8 mic[16];
1396
1397         if (data_len < sizeof(*hdr) + sizeof(*key))
1398                 return -1;
1399
1400         hdr = (struct ieee802_1x_hdr *) data;
1401         key = (struct wpa_eapol_key *) (hdr + 1);
1402         key_info = WPA_GET_BE16(key->key_info);
1403         os_memcpy(mic, key->key_mic, 16);
1404         os_memset(key->key_mic, 0, 16);
1405         if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1406                               data, data_len, key->key_mic) ||
1407             os_memcmp(mic, key->key_mic, 16) != 0)
1408                 ret = -1;
1409         os_memcpy(key->key_mic, mic, 16);
1410         return ret;
1411 }
1412
1413
1414 void wpa_remove_ptk(struct wpa_state_machine *sm)
1415 {
1416         sm->PTK_valid = FALSE;
1417         os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1418         wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1419         sm->pairwise_set = FALSE;
1420         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1421 }
1422
1423
1424 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1425 {
1426         int remove_ptk = 1;
1427
1428         if (sm == NULL)
1429                 return -1;
1430
1431         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1432                          "event %d notification", event);
1433
1434         switch (event) {
1435         case WPA_AUTH:
1436         case WPA_ASSOC:
1437                 break;
1438         case WPA_DEAUTH:
1439         case WPA_DISASSOC:
1440                 sm->DeauthenticationRequest = TRUE;
1441                 break;
1442         case WPA_REAUTH:
1443         case WPA_REAUTH_EAPOL:
1444                 if (!sm->started) {
1445                         /*
1446                          * When using WPS, we may end up here if the STA
1447                          * manages to re-associate without the previous STA
1448                          * entry getting removed. Consequently, we need to make
1449                          * sure that the WPA state machines gets initialized
1450                          * properly at this point.
1451                          */
1452                         wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1453                                    "started - initialize now");
1454                         sm->started = 1;
1455                         sm->Init = TRUE;
1456                         if (wpa_sm_step(sm) == 1)
1457                                 return 1; /* should not really happen */
1458                         sm->Init = FALSE;
1459                         sm->AuthenticationRequest = TRUE;
1460                         break;
1461                 }
1462                 if (sm->GUpdateStationKeys) {
1463                         /*
1464                          * Reauthentication cancels the pending group key
1465                          * update for this STA.
1466                          */
1467                         sm->group->GKeyDoneStations--;
1468                         sm->GUpdateStationKeys = FALSE;
1469                         sm->PtkGroupInit = TRUE;
1470                 }
1471                 sm->ReAuthenticationRequest = TRUE;
1472                 break;
1473         case WPA_ASSOC_FT:
1474 #ifdef CONFIG_IEEE80211R
1475                 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1476                            "after association");
1477                 wpa_ft_install_ptk(sm);
1478
1479                 /* Using FT protocol, not WPA auth state machine */
1480                 sm->ft_completed = 1;
1481                 return 0;
1482 #else /* CONFIG_IEEE80211R */
1483                 break;
1484 #endif /* CONFIG_IEEE80211R */
1485         }
1486
1487 #ifdef CONFIG_IEEE80211R
1488         sm->ft_completed = 0;
1489 #endif /* CONFIG_IEEE80211R */
1490
1491 #ifdef CONFIG_IEEE80211W
1492         if (sm->mgmt_frame_prot && event == WPA_AUTH)
1493                 remove_ptk = 0;
1494 #endif /* CONFIG_IEEE80211W */
1495
1496         if (remove_ptk) {
1497                 sm->PTK_valid = FALSE;
1498                 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1499
1500                 if (event != WPA_REAUTH_EAPOL)
1501                         wpa_remove_ptk(sm);
1502         }
1503
1504         return wpa_sm_step(sm);
1505 }
1506
1507
1508 SM_STATE(WPA_PTK, INITIALIZE)
1509 {
1510         SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1511         if (sm->Init) {
1512                 /* Init flag is not cleared here, so avoid busy
1513                  * loop by claiming nothing changed. */
1514                 sm->changed = FALSE;
1515         }
1516
1517         sm->keycount = 0;
1518         if (sm->GUpdateStationKeys)
1519                 sm->group->GKeyDoneStations--;
1520         sm->GUpdateStationKeys = FALSE;
1521         if (sm->wpa == WPA_VERSION_WPA)
1522                 sm->PInitAKeys = FALSE;
1523         if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1524                * Local AA > Remote AA)) */) {
1525                 sm->Pair = TRUE;
1526         }
1527         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1528         wpa_remove_ptk(sm);
1529         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1530         sm->TimeoutCtr = 0;
1531         if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1532                 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1533                                    WPA_EAPOL_authorized, 0);
1534         }
1535 }
1536
1537
1538 SM_STATE(WPA_PTK, DISCONNECT)
1539 {
1540         SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1541         sm->Disconnect = FALSE;
1542         wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1543 }
1544
1545
1546 SM_STATE(WPA_PTK, DISCONNECTED)
1547 {
1548         SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1549         sm->DeauthenticationRequest = FALSE;
1550 }
1551
1552
1553 SM_STATE(WPA_PTK, AUTHENTICATION)
1554 {
1555         SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1556         os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1557         sm->PTK_valid = FALSE;
1558         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1559                            1);
1560         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1561         sm->AuthenticationRequest = FALSE;
1562 }
1563
1564
1565 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1566                                   struct wpa_group *group)
1567 {
1568         if (group->first_sta_seen)
1569                 return;
1570         /*
1571          * System has run bit further than at the time hostapd was started
1572          * potentially very early during boot up. This provides better chances
1573          * of collecting more randomness on embedded systems. Re-initialize the
1574          * GMK and Counter here to improve their strength if there was not
1575          * enough entropy available immediately after system startup.
1576          */
1577         wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1578                    "station");
1579         if (random_pool_ready() != 1) {
1580                 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1581                            "to proceed - reject first 4-way handshake");
1582                 group->reject_4way_hs_for_entropy = TRUE;
1583         } else {
1584                 group->first_sta_seen = TRUE;
1585                 group->reject_4way_hs_for_entropy = FALSE;
1586         }
1587
1588         wpa_group_init_gmk_and_counter(wpa_auth, group);
1589         wpa_gtk_update(wpa_auth, group);
1590         wpa_group_config_group_keys(wpa_auth, group);
1591 }
1592
1593
1594 SM_STATE(WPA_PTK, AUTHENTICATION2)
1595 {
1596         SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1597
1598         wpa_group_ensure_init(sm->wpa_auth, sm->group);
1599
1600         /*
1601          * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1602          * ambiguous. The Authenticator state machine uses a counter that is
1603          * incremented by one for each 4-way handshake. However, the security
1604          * analysis of 4-way handshake points out that unpredictable nonces
1605          * help in preventing precomputation attacks. Instead of the state
1606          * machine definition, use an unpredictable nonce value here to provide
1607          * stronger protection against potential precomputation attacks.
1608          */
1609         if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1610                 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1611                            "ANonce.");
1612                 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1613                 return;
1614         }
1615         wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1616                     WPA_NONCE_LEN);
1617         sm->ReAuthenticationRequest = FALSE;
1618         /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1619          * logical place than INITIALIZE since AUTHENTICATION2 can be
1620          * re-entered on ReAuthenticationRequest without going through
1621          * INITIALIZE. */
1622         sm->TimeoutCtr = 0;
1623 }
1624
1625
1626 SM_STATE(WPA_PTK, INITPMK)
1627 {
1628         u8 msk[2 * PMK_LEN];
1629         size_t len = 2 * PMK_LEN;
1630
1631         SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1632 #ifdef CONFIG_IEEE80211R
1633         sm->xxkey_len = 0;
1634 #endif /* CONFIG_IEEE80211R */
1635         if (sm->pmksa) {
1636                 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1637                 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1638         } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1639                 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1640                            "(len=%lu)", (unsigned long) len);
1641                 os_memcpy(sm->PMK, msk, PMK_LEN);
1642 #ifdef CONFIG_IEEE80211R
1643                 if (len >= 2 * PMK_LEN) {
1644                         os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1645                         sm->xxkey_len = PMK_LEN;
1646                 }
1647 #endif /* CONFIG_IEEE80211R */
1648         } else {
1649                 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1650         }
1651
1652         sm->req_replay_counter_used = 0;
1653         /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1654          * will break reauthentication since EAPOL state machines may not be
1655          * get into AUTHENTICATING state that clears keyRun before WPA state
1656          * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1657          * state and takes PMK from the previously used AAA Key. This will
1658          * eventually fail in 4-Way Handshake because Supplicant uses PMK
1659          * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1660          * be good workaround for this issue. */
1661         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1662 }
1663
1664
1665 SM_STATE(WPA_PTK, INITPSK)
1666 {
1667         const u8 *psk;
1668         SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1669         psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL);
1670         if (psk) {
1671                 os_memcpy(sm->PMK, psk, PMK_LEN);
1672 #ifdef CONFIG_IEEE80211R
1673                 os_memcpy(sm->xxkey, psk, PMK_LEN);
1674                 sm->xxkey_len = PMK_LEN;
1675 #endif /* CONFIG_IEEE80211R */
1676         }
1677         sm->req_replay_counter_used = 0;
1678 }
1679
1680
1681 SM_STATE(WPA_PTK, PTKSTART)
1682 {
1683         u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1684         size_t pmkid_len = 0;
1685
1686         SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1687         sm->PTKRequest = FALSE;
1688         sm->TimeoutEvt = FALSE;
1689
1690         sm->TimeoutCtr++;
1691         if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1692                 /* No point in sending the EAPOL-Key - we will disconnect
1693                  * immediately following this. */
1694                 return;
1695         }
1696
1697         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1698                         "sending 1/4 msg of 4-Way Handshake");
1699         /*
1700          * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1701          * one possible PSK for this STA.
1702          */
1703         if (sm->wpa == WPA_VERSION_WPA2 &&
1704             wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) {
1705                 pmkid = buf;
1706                 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1707                 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1708                 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1709                 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1710                 if (sm->pmksa)
1711                         os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1712                                   sm->pmksa->pmkid, PMKID_LEN);
1713                 else {
1714                         /*
1715                          * Calculate PMKID since no PMKSA cache entry was
1716                          * available with pre-calculated PMKID.
1717                          */
1718                         rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1719                                   sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1720                                   wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1721                 }
1722         }
1723         wpa_send_eapol(sm->wpa_auth, sm,
1724                        WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1725                        sm->ANonce, pmkid, pmkid_len, 0, 0);
1726 }
1727
1728
1729 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1730                           struct wpa_ptk *ptk)
1731 {
1732         size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64;
1733 #ifdef CONFIG_IEEE80211R
1734         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1735                 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1736 #endif /* CONFIG_IEEE80211R */
1737
1738         wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1739                        sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1740                        (u8 *) ptk, ptk_len,
1741                        wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1742
1743         return 0;
1744 }
1745
1746
1747 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1748 {
1749         struct wpa_ptk PTK;
1750         int ok = 0;
1751         const u8 *pmk = NULL;
1752
1753         SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1754         sm->EAPOLKeyReceived = FALSE;
1755         sm->update_snonce = FALSE;
1756
1757         /* WPA with IEEE 802.1X: use the derived PMK from EAP
1758          * WPA-PSK: iterate through possible PSKs and select the one matching
1759          * the packet */
1760         for (;;) {
1761                 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1762                         pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk);
1763                         if (pmk == NULL)
1764                                 break;
1765                 } else
1766                         pmk = sm->PMK;
1767
1768                 wpa_derive_ptk(sm, pmk, &PTK);
1769
1770                 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1771                                        sm->last_rx_eapol_key_len) == 0) {
1772                         ok = 1;
1773                         break;
1774                 }
1775
1776                 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1777                         break;
1778         }
1779
1780         if (!ok) {
1781                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1782                                 "invalid MIC in msg 2/4 of 4-Way Handshake");
1783                 return;
1784         }
1785
1786 #ifdef CONFIG_IEEE80211R
1787         if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1788                 /*
1789                  * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1790                  * with the value we derived.
1791                  */
1792                 if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1793                               WPA_PMK_NAME_LEN) != 0) {
1794                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1795                                         "PMKR1Name mismatch in FT 4-way "
1796                                         "handshake");
1797                         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1798                                     "Supplicant",
1799                                     sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1800                         wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1801                                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1802                         return;
1803                 }
1804         }
1805 #endif /* CONFIG_IEEE80211R */
1806
1807         sm->pending_1_of_4_timeout = 0;
1808         eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1809
1810         if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1811                 /* PSK may have changed from the previous choice, so update
1812                  * state machine data based on whatever PSK was selected here.
1813                  */
1814                 os_memcpy(sm->PMK, pmk, PMK_LEN);
1815         }
1816
1817         sm->MICVerified = TRUE;
1818
1819         os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1820         sm->PTK_valid = TRUE;
1821 }
1822
1823
1824 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1825 {
1826         SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1827         sm->TimeoutCtr = 0;
1828 }
1829
1830
1831 #ifdef CONFIG_IEEE80211W
1832
1833 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1834 {
1835         if (sm->mgmt_frame_prot) {
1836                 return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde);
1837         }
1838
1839         return 0;
1840 }
1841
1842
1843 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1844 {
1845         struct wpa_igtk_kde igtk;
1846         struct wpa_group *gsm = sm->group;
1847
1848         if (!sm->mgmt_frame_prot)
1849                 return pos;
1850
1851         igtk.keyid[0] = gsm->GN_igtk;
1852         igtk.keyid[1] = 0;
1853         if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1854             wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0)
1855                 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1856         os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
1857         if (sm->wpa_auth->conf.disable_gtk) {
1858                 /*
1859                  * Provide unique random IGTK to each STA to prevent use of
1860                  * IGTK in the BSS.
1861                  */
1862                 if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0)
1863                         return pos;
1864         }
1865         pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1866                           (const u8 *) &igtk, sizeof(igtk), NULL, 0);
1867
1868         return pos;
1869 }
1870
1871 #else /* CONFIG_IEEE80211W */
1872
1873 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1874 {
1875         return 0;
1876 }
1877
1878
1879 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1880 {
1881         return pos;
1882 }
1883
1884 #endif /* CONFIG_IEEE80211W */
1885
1886
1887 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1888 {
1889         u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1890         size_t gtk_len, kde_len;
1891         struct wpa_group *gsm = sm->group;
1892         u8 *wpa_ie;
1893         int wpa_ie_len, secure, keyidx, encr = 0;
1894
1895         SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1896         sm->TimeoutEvt = FALSE;
1897
1898         sm->TimeoutCtr++;
1899         if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1900                 /* No point in sending the EAPOL-Key - we will disconnect
1901                  * immediately following this. */
1902                 return;
1903         }
1904
1905         /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
1906            GTK[GN], IGTK, [FTIE], [TIE * 2])
1907          */
1908         os_memset(rsc, 0, WPA_KEY_RSC_LEN);
1909         wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
1910         /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
1911         wpa_ie = sm->wpa_auth->wpa_ie;
1912         wpa_ie_len = sm->wpa_auth->wpa_ie_len;
1913         if (sm->wpa == WPA_VERSION_WPA &&
1914             (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
1915             wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
1916                 /* WPA-only STA, remove RSN IE */
1917                 wpa_ie = wpa_ie + wpa_ie[1] + 2;
1918                 wpa_ie_len = wpa_ie[1] + 2;
1919         }
1920         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1921                         "sending 3/4 msg of 4-Way Handshake");
1922         if (sm->wpa == WPA_VERSION_WPA2) {
1923                 /* WPA2 send GTK in the 4-way handshake */
1924                 secure = 1;
1925                 gtk = gsm->GTK[gsm->GN - 1];
1926                 gtk_len = gsm->GTK_len;
1927                 if (sm->wpa_auth->conf.disable_gtk) {
1928                         /*
1929                          * Provide unique random GTK to each STA to prevent use
1930                          * of GTK in the BSS.
1931                          */
1932                         if (random_get_bytes(dummy_gtk, gtk_len) < 0)
1933                                 return;
1934                         gtk = dummy_gtk;
1935                 }
1936                 keyidx = gsm->GN;
1937                 _rsc = rsc;
1938                 encr = 1;
1939         } else {
1940                 /* WPA does not include GTK in msg 3/4 */
1941                 secure = 0;
1942                 gtk = NULL;
1943                 gtk_len = 0;
1944                 keyidx = 0;
1945                 _rsc = NULL;
1946                 if (sm->rx_eapol_key_secure) {
1947                         /*
1948                          * It looks like Windows 7 supplicant tries to use
1949                          * Secure bit in msg 2/4 after having reported Michael
1950                          * MIC failure and it then rejects the 4-way handshake
1951                          * if msg 3/4 does not set Secure bit. Work around this
1952                          * by setting the Secure bit here even in the case of
1953                          * WPA if the supplicant used it first.
1954                          */
1955                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1956                                         "STA used Secure bit in WPA msg 2/4 - "
1957                                         "set Secure for 3/4 as workaround");
1958                         secure = 1;
1959                 }
1960         }
1961
1962         kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
1963         if (gtk)
1964                 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
1965 #ifdef CONFIG_IEEE80211R
1966         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1967                 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
1968                 kde_len += 300; /* FTIE + 2 * TIE */
1969         }
1970 #endif /* CONFIG_IEEE80211R */
1971         kde = os_malloc(kde_len);
1972         if (kde == NULL)
1973                 return;
1974
1975         pos = kde;
1976         os_memcpy(pos, wpa_ie, wpa_ie_len);
1977         pos += wpa_ie_len;
1978 #ifdef CONFIG_IEEE80211R
1979         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1980                 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
1981                 if (res < 0) {
1982                         wpa_printf(MSG_ERROR, "FT: Failed to insert "
1983                                    "PMKR1Name into RSN IE in EAPOL-Key data");
1984                         os_free(kde);
1985                         return;
1986                 }
1987                 pos += res;
1988         }
1989 #endif /* CONFIG_IEEE80211R */
1990         if (gtk) {
1991                 u8 hdr[2];
1992                 hdr[0] = keyidx & 0x03;
1993                 hdr[1] = 0;
1994                 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
1995                                   gtk, gtk_len);
1996         }
1997         pos = ieee80211w_kde_add(sm, pos);
1998
1999 #ifdef CONFIG_IEEE80211R
2000         if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2001                 int res;
2002                 struct wpa_auth_config *conf;
2003
2004                 conf = &sm->wpa_auth->conf;
2005                 res = wpa_write_ftie(conf, conf->r0_key_holder,
2006                                      conf->r0_key_holder_len,
2007                                      NULL, NULL, pos, kde + kde_len - pos,
2008                                      NULL, 0);
2009                 if (res < 0) {
2010                         wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2011                                    "into EAPOL-Key Key Data");
2012                         os_free(kde);
2013                         return;
2014                 }
2015                 pos += res;
2016
2017                 /* TIE[ReassociationDeadline] (TU) */
2018                 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2019                 *pos++ = 5;
2020                 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2021                 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2022                 pos += 4;
2023
2024                 /* TIE[KeyLifetime] (seconds) */
2025                 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2026                 *pos++ = 5;
2027                 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2028                 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2029                 pos += 4;
2030         }
2031 #endif /* CONFIG_IEEE80211R */
2032
2033         wpa_send_eapol(sm->wpa_auth, sm,
2034                        (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2035                        WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2036                        WPA_KEY_INFO_KEY_TYPE,
2037                        _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2038         os_free(kde);
2039 }
2040
2041
2042 SM_STATE(WPA_PTK, PTKINITDONE)
2043 {
2044         SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2045         sm->EAPOLKeyReceived = FALSE;
2046         if (sm->Pair) {
2047                 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2048                 int klen = wpa_cipher_key_len(sm->pairwise);
2049                 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2050                                      sm->PTK.tk1, klen)) {
2051                         wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2052                         return;
2053                 }
2054                 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2055                 sm->pairwise_set = TRUE;
2056
2057                 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2058                         eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2059                         eloop_register_timeout(sm->wpa_auth->conf.
2060                                                wpa_ptk_rekey, 0, wpa_rekey_ptk,
2061                                                sm->wpa_auth, sm);
2062                 }
2063
2064                 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2065                         wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2066                                            WPA_EAPOL_authorized, 1);
2067                 }
2068         }
2069
2070         if (0 /* IBSS == TRUE */) {
2071                 sm->keycount++;
2072                 if (sm->keycount == 2) {
2073                         wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2074                                            WPA_EAPOL_portValid, 1);
2075                 }
2076         } else {
2077                 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2078                                    1);
2079         }
2080         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2081         wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2082         if (sm->wpa == WPA_VERSION_WPA)
2083                 sm->PInitAKeys = TRUE;
2084         else
2085                 sm->has_GTK = TRUE;
2086         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2087                          "pairwise key handshake completed (%s)",
2088                          sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2089
2090 #ifdef CONFIG_IEEE80211R
2091         wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2092 #endif /* CONFIG_IEEE80211R */
2093 }
2094
2095
2096 SM_STEP(WPA_PTK)
2097 {
2098         struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2099
2100         if (sm->Init)
2101                 SM_ENTER(WPA_PTK, INITIALIZE);
2102         else if (sm->Disconnect
2103                  /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2104                 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2105                                 "WPA_PTK: sm->Disconnect");
2106                 SM_ENTER(WPA_PTK, DISCONNECT);
2107         }
2108         else if (sm->DeauthenticationRequest)
2109                 SM_ENTER(WPA_PTK, DISCONNECTED);
2110         else if (sm->AuthenticationRequest)
2111                 SM_ENTER(WPA_PTK, AUTHENTICATION);
2112         else if (sm->ReAuthenticationRequest)
2113                 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2114         else if (sm->PTKRequest)
2115                 SM_ENTER(WPA_PTK, PTKSTART);
2116         else switch (sm->wpa_ptk_state) {
2117         case WPA_PTK_INITIALIZE:
2118                 break;
2119         case WPA_PTK_DISCONNECT:
2120                 SM_ENTER(WPA_PTK, DISCONNECTED);
2121                 break;
2122         case WPA_PTK_DISCONNECTED:
2123                 SM_ENTER(WPA_PTK, INITIALIZE);
2124                 break;
2125         case WPA_PTK_AUTHENTICATION:
2126                 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2127                 break;
2128         case WPA_PTK_AUTHENTICATION2:
2129                 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2130                     wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2131                                        WPA_EAPOL_keyRun) > 0)
2132                         SM_ENTER(WPA_PTK, INITPMK);
2133                 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2134                          /* FIX: && 802.1X::keyRun */)
2135                         SM_ENTER(WPA_PTK, INITPSK);
2136                 break;
2137         case WPA_PTK_INITPMK:
2138                 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2139                                        WPA_EAPOL_keyAvailable) > 0)
2140                         SM_ENTER(WPA_PTK, PTKSTART);
2141                 else {
2142                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2143                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2144                                         "INITPMK - keyAvailable = false");
2145                         SM_ENTER(WPA_PTK, DISCONNECT);
2146                 }
2147                 break;
2148         case WPA_PTK_INITPSK:
2149                 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL))
2150                         SM_ENTER(WPA_PTK, PTKSTART);
2151                 else {
2152                         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2153                                         "no PSK configured for the STA");
2154                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2155                         SM_ENTER(WPA_PTK, DISCONNECT);
2156                 }
2157                 break;
2158         case WPA_PTK_PTKSTART:
2159                 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2160                     sm->EAPOLKeyPairwise)
2161                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2162                 else if (sm->TimeoutCtr >
2163                          (int) dot11RSNAConfigPairwiseUpdateCount) {
2164                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2165                         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2166                                          "PTKSTART: Retry limit %d reached",
2167                                          dot11RSNAConfigPairwiseUpdateCount);
2168                         SM_ENTER(WPA_PTK, DISCONNECT);
2169                 } else if (sm->TimeoutEvt)
2170                         SM_ENTER(WPA_PTK, PTKSTART);
2171                 break;
2172         case WPA_PTK_PTKCALCNEGOTIATING:
2173                 if (sm->MICVerified)
2174                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2175                 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2176                          sm->EAPOLKeyPairwise)
2177                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2178                 else if (sm->TimeoutEvt)
2179                         SM_ENTER(WPA_PTK, PTKSTART);
2180                 break;
2181         case WPA_PTK_PTKCALCNEGOTIATING2:
2182                 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2183                 break;
2184         case WPA_PTK_PTKINITNEGOTIATING:
2185                 if (sm->update_snonce)
2186                         SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2187                 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2188                          sm->EAPOLKeyPairwise && sm->MICVerified)
2189                         SM_ENTER(WPA_PTK, PTKINITDONE);
2190                 else if (sm->TimeoutCtr >
2191                          (int) dot11RSNAConfigPairwiseUpdateCount) {
2192                         wpa_auth->dot11RSNA4WayHandshakeFailures++;
2193                         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2194                                          "PTKINITNEGOTIATING: Retry limit %d "
2195                                          "reached",
2196                                          dot11RSNAConfigPairwiseUpdateCount);
2197                         SM_ENTER(WPA_PTK, DISCONNECT);
2198                 } else if (sm->TimeoutEvt)
2199                         SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2200                 break;
2201         case WPA_PTK_PTKINITDONE:
2202                 break;
2203         }
2204 }
2205
2206
2207 SM_STATE(WPA_PTK_GROUP, IDLE)
2208 {
2209         SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2210         if (sm->Init) {
2211                 /* Init flag is not cleared here, so avoid busy
2212                  * loop by claiming nothing changed. */
2213                 sm->changed = FALSE;
2214         }
2215         sm->GTimeoutCtr = 0;
2216 }
2217
2218
2219 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2220 {
2221         u8 rsc[WPA_KEY_RSC_LEN];
2222         struct wpa_group *gsm = sm->group;
2223         u8 *kde, *pos, hdr[2];
2224         size_t kde_len;
2225         u8 *gtk, dummy_gtk[32];
2226
2227         SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2228
2229         sm->GTimeoutCtr++;
2230         if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2231                 /* No point in sending the EAPOL-Key - we will disconnect
2232                  * immediately following this. */
2233                 return;
2234         }
2235
2236         if (sm->wpa == WPA_VERSION_WPA)
2237                 sm->PInitAKeys = FALSE;
2238         sm->TimeoutEvt = FALSE;
2239         /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2240         os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2241         if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2242                 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2243         wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2244                         "sending 1/2 msg of Group Key Handshake");
2245
2246         gtk = gsm->GTK[gsm->GN - 1];
2247         if (sm->wpa_auth->conf.disable_gtk) {
2248                 /*
2249                  * Provide unique random GTK to each STA to prevent use
2250                  * of GTK in the BSS.
2251                  */
2252                 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2253                         return;
2254                 gtk = dummy_gtk;
2255         }
2256         if (sm->wpa == WPA_VERSION_WPA2) {
2257                 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2258                         ieee80211w_kde_len(sm);
2259                 kde = os_malloc(kde_len);
2260                 if (kde == NULL)
2261                         return;
2262
2263                 pos = kde;
2264                 hdr[0] = gsm->GN & 0x03;
2265                 hdr[1] = 0;
2266                 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2267                                   gtk, gsm->GTK_len);
2268                 pos = ieee80211w_kde_add(sm, pos);
2269         } else {
2270                 kde = gtk;
2271                 pos = kde + gsm->GTK_len;
2272         }
2273
2274         wpa_send_eapol(sm->wpa_auth, sm,
2275                        WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2276                        WPA_KEY_INFO_ACK |
2277                        (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2278                        rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2279         if (sm->wpa == WPA_VERSION_WPA2)
2280                 os_free(kde);
2281 }
2282
2283
2284 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2285 {
2286         SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2287         sm->EAPOLKeyReceived = FALSE;
2288         if (sm->GUpdateStationKeys)
2289                 sm->group->GKeyDoneStations--;
2290         sm->GUpdateStationKeys = FALSE;
2291         sm->GTimeoutCtr = 0;
2292         /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2293         wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2294                          "group key handshake completed (%s)",
2295                          sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2296         sm->has_GTK = TRUE;
2297 }
2298
2299
2300 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2301 {
2302         SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2303         if (sm->GUpdateStationKeys)
2304                 sm->group->GKeyDoneStations--;
2305         sm->GUpdateStationKeys = FALSE;
2306         sm->Disconnect = TRUE;
2307 }
2308
2309
2310 SM_STEP(WPA_PTK_GROUP)
2311 {
2312         if (sm->Init || sm->PtkGroupInit) {
2313                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2314                 sm->PtkGroupInit = FALSE;
2315         } else switch (sm->wpa_ptk_group_state) {
2316         case WPA_PTK_GROUP_IDLE:
2317                 if (sm->GUpdateStationKeys ||
2318                     (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2319                         SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2320                 break;
2321         case WPA_PTK_GROUP_REKEYNEGOTIATING:
2322                 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2323                     !sm->EAPOLKeyPairwise && sm->MICVerified)
2324                         SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2325                 else if (sm->GTimeoutCtr >
2326                          (int) dot11RSNAConfigGroupUpdateCount)
2327                         SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2328                 else if (sm->TimeoutEvt)
2329                         SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2330                 break;
2331         case WPA_PTK_GROUP_KEYERROR:
2332                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2333                 break;
2334         case WPA_PTK_GROUP_REKEYESTABLISHED:
2335                 SM_ENTER(WPA_PTK_GROUP, IDLE);
2336                 break;
2337         }
2338 }
2339
2340
2341 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2342                           struct wpa_group *group)
2343 {
2344         int ret = 0;
2345
2346         os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2347         inc_byte_array(group->Counter, WPA_NONCE_LEN);
2348         if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2349                            wpa_auth->addr, group->GNonce,
2350                            group->GTK[group->GN - 1], group->GTK_len) < 0)
2351                 ret = -1;
2352         wpa_hexdump_key(MSG_DEBUG, "GTK",
2353                         group->GTK[group->GN - 1], group->GTK_len);
2354
2355 #ifdef CONFIG_IEEE80211W
2356         if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2357                 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2358                 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2359                 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2360                                    wpa_auth->addr, group->GNonce,
2361                                    group->IGTK[group->GN_igtk - 4],
2362                                    WPA_IGTK_LEN) < 0)
2363                         ret = -1;
2364                 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2365                                 group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN);
2366         }
2367 #endif /* CONFIG_IEEE80211W */
2368
2369         return ret;
2370 }
2371
2372
2373 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2374                                struct wpa_group *group)
2375 {
2376         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2377                    "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2378         group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2379         group->wpa_group_state = WPA_GROUP_GTK_INIT;
2380
2381         /* GTK[0..N] = 0 */
2382         os_memset(group->GTK, 0, sizeof(group->GTK));
2383         group->GN = 1;
2384         group->GM = 2;
2385 #ifdef CONFIG_IEEE80211W
2386         group->GN_igtk = 4;
2387         group->GM_igtk = 5;
2388 #endif /* CONFIG_IEEE80211W */
2389         /* GTK[GN] = CalcGTK() */
2390         wpa_gtk_update(wpa_auth, group);
2391 }
2392
2393
2394 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2395 {
2396         if (ctx != NULL && ctx != sm->group)
2397                 return 0;
2398
2399         if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2400                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2401                                 "Not in PTKINITDONE; skip Group Key update");
2402                 sm->GUpdateStationKeys = FALSE;
2403                 return 0;
2404         }
2405         if (sm->GUpdateStationKeys) {
2406                 /*
2407                  * This should not really happen, so add a debug log entry.
2408                  * Since we clear the GKeyDoneStations before the loop, the
2409                  * station needs to be counted here anyway.
2410                  */
2411                 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2412                                 "GUpdateStationKeys was already set when "
2413                                 "marking station for GTK rekeying");
2414         }
2415
2416         /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2417         if (sm->is_wnmsleep)
2418                 return 0;
2419
2420         sm->group->GKeyDoneStations++;
2421         sm->GUpdateStationKeys = TRUE;
2422
2423         wpa_sm_step(sm);
2424         return 0;
2425 }
2426
2427
2428 #ifdef CONFIG_WNM
2429 /* update GTK when exiting WNM-Sleep Mode */
2430 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2431 {
2432         if (sm->is_wnmsleep)
2433                 return;
2434
2435         wpa_group_update_sta(sm, NULL);
2436 }
2437
2438
2439 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2440 {
2441         sm->is_wnmsleep = !!flag;
2442 }
2443
2444
2445 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2446 {
2447         struct wpa_group *gsm = sm->group;
2448         u8 *start = pos;
2449
2450         /*
2451          * GTK subelement:
2452          * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2453          * Key[5..32]
2454          */
2455         *pos++ = WNM_SLEEP_SUBELEM_GTK;
2456         *pos++ = 11 + gsm->GTK_len;
2457         /* Key ID in B0-B1 of Key Info */
2458         WPA_PUT_LE16(pos, gsm->GN & 0x03);
2459         pos += 2;
2460         *pos++ = gsm->GTK_len;
2461         if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2462                 return 0;
2463         pos += 8;
2464         os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2465         pos += gsm->GTK_len;
2466
2467         wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2468                    gsm->GN);
2469         wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2470                         gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2471
2472         return pos - start;
2473 }
2474
2475
2476 #ifdef CONFIG_IEEE80211W
2477 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2478 {
2479         struct wpa_group *gsm = sm->group;
2480         u8 *start = pos;
2481
2482         /*
2483          * IGTK subelement:
2484          * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2485          */
2486         *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2487         *pos++ = 2 + 6 + WPA_IGTK_LEN;
2488         WPA_PUT_LE16(pos, gsm->GN_igtk);
2489         pos += 2;
2490         if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2491                 return 0;
2492         pos += 6;
2493
2494         os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2495         pos += WPA_IGTK_LEN;
2496
2497         wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2498                    gsm->GN_igtk);
2499         wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2500                         gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN);
2501
2502         return pos - start;
2503 }
2504 #endif /* CONFIG_IEEE80211W */
2505 #endif /* CONFIG_WNM */
2506
2507
2508 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2509                               struct wpa_group *group)
2510 {
2511         int tmp;
2512
2513         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2514                    "SETKEYS (VLAN-ID %d)", group->vlan_id);
2515         group->changed = TRUE;
2516         group->wpa_group_state = WPA_GROUP_SETKEYS;
2517         group->GTKReKey = FALSE;
2518         tmp = group->GM;
2519         group->GM = group->GN;
2520         group->GN = tmp;
2521 #ifdef CONFIG_IEEE80211W
2522         tmp = group->GM_igtk;
2523         group->GM_igtk = group->GN_igtk;
2524         group->GN_igtk = tmp;
2525 #endif /* CONFIG_IEEE80211W */
2526         /* "GKeyDoneStations = GNoStations" is done in more robust way by
2527          * counting the STAs that are marked with GUpdateStationKeys instead of
2528          * including all STAs that could be in not-yet-completed state. */
2529         wpa_gtk_update(wpa_auth, group);
2530
2531         if (group->GKeyDoneStations) {
2532                 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2533                            "GKeyDoneStations=%d when starting new GTK rekey",
2534                            group->GKeyDoneStations);
2535                 group->GKeyDoneStations = 0;
2536         }
2537         wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2538         wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2539                    group->GKeyDoneStations);
2540 }
2541
2542
2543 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2544                                        struct wpa_group *group)
2545 {
2546         int ret = 0;
2547
2548         if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2549                              wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2550                              broadcast_ether_addr, group->GN,
2551                              group->GTK[group->GN - 1], group->GTK_len) < 0)
2552                 ret = -1;
2553
2554 #ifdef CONFIG_IEEE80211W
2555         if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION &&
2556             wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK,
2557                              broadcast_ether_addr, group->GN_igtk,
2558                              group->IGTK[group->GN_igtk - 4],
2559                              WPA_IGTK_LEN) < 0)
2560                 ret = -1;
2561 #endif /* CONFIG_IEEE80211W */
2562
2563         return ret;
2564 }
2565
2566
2567 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2568                                  struct wpa_group *group)
2569 {
2570         wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2571                    "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2572         group->changed = TRUE;
2573         group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2574
2575         if (wpa_group_config_group_keys(wpa_auth, group) < 0)
2576                 return -1;
2577
2578         return 0;
2579 }
2580
2581
2582 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2583                               struct wpa_group *group)
2584 {
2585         if (group->GInit) {
2586                 wpa_group_gtk_init(wpa_auth, group);
2587         } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2588                    group->GTKAuthenticator) {
2589                 wpa_group_setkeysdone(wpa_auth, group);
2590         } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2591                    group->GTKReKey) {
2592                 wpa_group_setkeys(wpa_auth, group);
2593         } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2594                 if (group->GKeyDoneStations == 0)
2595                         wpa_group_setkeysdone(wpa_auth, group);
2596                 else if (group->GTKReKey)
2597                         wpa_group_setkeys(wpa_auth, group);
2598         }
2599 }
2600
2601
2602 static int wpa_sm_step(struct wpa_state_machine *sm)
2603 {
2604         if (sm == NULL)
2605                 return 0;
2606
2607         if (sm->in_step_loop) {
2608                 /* This should not happen, but if it does, make sure we do not
2609                  * end up freeing the state machine too early by exiting the
2610                  * recursive call. */
2611                 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2612                 return 0;
2613         }
2614
2615         sm->in_step_loop = 1;
2616         do {
2617                 if (sm->pending_deinit)
2618                         break;
2619
2620                 sm->changed = FALSE;
2621                 sm->wpa_auth->group->changed = FALSE;
2622
2623                 SM_STEP_RUN(WPA_PTK);
2624                 if (sm->pending_deinit)
2625                         break;
2626                 SM_STEP_RUN(WPA_PTK_GROUP);
2627                 if (sm->pending_deinit)
2628                         break;
2629                 wpa_group_sm_step(sm->wpa_auth, sm->group);
2630         } while (sm->changed || sm->wpa_auth->group->changed);
2631         sm->in_step_loop = 0;
2632
2633         if (sm->pending_deinit) {
2634                 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2635                            "machine deinit for " MACSTR, MAC2STR(sm->addr));
2636                 wpa_free_sta_sm(sm);
2637                 return 1;
2638         }
2639         return 0;
2640 }
2641
2642
2643 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2644 {
2645         struct wpa_state_machine *sm = eloop_ctx;
2646         wpa_sm_step(sm);
2647 }
2648
2649
2650 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2651 {
2652         if (sm == NULL)
2653                 return;
2654         eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2655 }
2656
2657
2658 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2659 {
2660         int tmp, i;
2661         struct wpa_group *group;
2662
2663         if (wpa_auth == NULL)
2664                 return;
2665
2666         group = wpa_auth->group;
2667
2668         for (i = 0; i < 2; i++) {
2669                 tmp = group->GM;
2670                 group->GM = group->GN;
2671                 group->GN = tmp;
2672 #ifdef CONFIG_IEEE80211W
2673                 tmp = group->GM_igtk;
2674                 group->GM_igtk = group->GN_igtk;
2675                 group->GN_igtk = tmp;
2676 #endif /* CONFIG_IEEE80211W */
2677                 wpa_gtk_update(wpa_auth, group);
2678                 wpa_group_config_group_keys(wpa_auth, group);
2679         }
2680 }
2681
2682
2683 static const char * wpa_bool_txt(int bool)
2684 {
2685         return bool ? "TRUE" : "FALSE";
2686 }
2687
2688
2689 #define RSN_SUITE "%02x-%02x-%02x-%d"
2690 #define RSN_SUITE_ARG(s) \
2691 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2692
2693 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2694 {
2695         int len = 0, ret;
2696         char pmkid_txt[PMKID_LEN * 2 + 1];
2697 #ifdef CONFIG_RSN_PREAUTH
2698         const int preauth = 1;
2699 #else /* CONFIG_RSN_PREAUTH */
2700         const int preauth = 0;
2701 #endif /* CONFIG_RSN_PREAUTH */
2702
2703         if (wpa_auth == NULL)
2704                 return len;
2705
2706         ret = os_snprintf(buf + len, buflen - len,
2707                           "dot11RSNAOptionImplemented=TRUE\n"
2708                           "dot11RSNAPreauthenticationImplemented=%s\n"
2709                           "dot11RSNAEnabled=%s\n"
2710                           "dot11RSNAPreauthenticationEnabled=%s\n",
2711                           wpa_bool_txt(preauth),
2712                           wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2713                           wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2714         if (ret < 0 || (size_t) ret >= buflen - len)
2715                 return len;
2716         len += ret;
2717
2718         wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2719                          wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2720
2721         ret = os_snprintf(
2722                 buf + len, buflen - len,
2723                 "dot11RSNAConfigVersion=%u\n"
2724                 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2725                 /* FIX: dot11RSNAConfigGroupCipher */
2726                 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2727                 /* FIX: dot11RSNAConfigGroupRekeyTime */
2728                 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2729                 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2730                 "dot11RSNAConfigGroupUpdateCount=%u\n"
2731                 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2732                 "dot11RSNAConfigGroupCipherSize=%u\n"
2733                 "dot11RSNAConfigPMKLifetime=%u\n"
2734                 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2735                 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2736                 "dot11RSNAConfigSATimeout=%u\n"
2737                 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2738                 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2739                 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2740                 "dot11RSNAPMKIDUsed=%s\n"
2741                 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2742                 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2743                 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2744                 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2745                 "dot11RSNA4WayHandshakeFailures=%u\n"
2746                 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2747                 RSN_VERSION,
2748                 !!wpa_auth->conf.wpa_strict_rekey,
2749                 dot11RSNAConfigGroupUpdateCount,
2750                 dot11RSNAConfigPairwiseUpdateCount,
2751                 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2752                 dot11RSNAConfigPMKLifetime,
2753                 dot11RSNAConfigPMKReauthThreshold,
2754                 dot11RSNAConfigSATimeout,
2755                 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2756                 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2757                 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2758                 pmkid_txt,
2759                 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2760                 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2761                 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2762                 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2763                 wpa_auth->dot11RSNA4WayHandshakeFailures);
2764         if (ret < 0 || (size_t) ret >= buflen - len)
2765                 return len;
2766         len += ret;
2767
2768         /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2769         /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2770
2771         /* Private MIB */
2772         ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2773                           wpa_auth->group->wpa_group_state);
2774         if (ret < 0 || (size_t) ret >= buflen - len)
2775                 return len;
2776         len += ret;
2777
2778         return len;
2779 }
2780
2781
2782 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2783 {
2784         int len = 0, ret;
2785         u32 pairwise = 0;
2786
2787         if (sm == NULL)
2788                 return 0;
2789
2790         /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2791
2792         /* dot11RSNAStatsEntry */
2793
2794         pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2795                                        WPA_PROTO_RSN : WPA_PROTO_WPA,
2796                                        sm->pairwise);
2797         if (pairwise == 0)
2798                 return 0;
2799
2800         ret = os_snprintf(
2801                 buf + len, buflen - len,
2802                 /* TODO: dot11RSNAStatsIndex */
2803                 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2804                 "dot11RSNAStatsVersion=1\n"
2805                 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2806                 /* TODO: dot11RSNAStatsTKIPICVErrors */
2807                 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2808                 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2809                 /* TODO: dot11RSNAStatsCCMPReplays */
2810                 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2811                 /* TODO: dot11RSNAStatsTKIPReplays */,
2812                 MAC2STR(sm->addr),
2813                 RSN_SUITE_ARG(pairwise),
2814                 sm->dot11RSNAStatsTKIPLocalMICFailures,
2815                 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2816         if (ret < 0 || (size_t) ret >= buflen - len)
2817                 return len;
2818         len += ret;
2819
2820         /* Private MIB */
2821         ret = os_snprintf(buf + len, buflen - len,
2822                           "hostapdWPAPTKState=%d\n"
2823                           "hostapdWPAPTKGroupState=%d\n",
2824                           sm->wpa_ptk_state,
2825                           sm->wpa_ptk_group_state);
2826         if (ret < 0 || (size_t) ret >= buflen - len)
2827                 return len;
2828         len += ret;
2829
2830         return len;
2831 }
2832
2833
2834 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2835 {
2836         if (wpa_auth)
2837                 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2838 }
2839
2840
2841 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2842 {
2843         return sm && sm->pairwise_set;
2844 }
2845
2846
2847 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2848 {
2849         return sm->pairwise;
2850 }
2851
2852
2853 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
2854 {
2855         if (sm == NULL)
2856                 return -1;
2857         return sm->wpa_key_mgmt;
2858 }
2859
2860
2861 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
2862 {
2863         if (sm == NULL)
2864                 return 0;
2865         return sm->wpa;
2866 }
2867
2868
2869 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
2870                              struct rsn_pmksa_cache_entry *entry)
2871 {
2872         if (sm == NULL || sm->pmksa != entry)
2873                 return -1;
2874         sm->pmksa = NULL;
2875         return 0;
2876 }
2877
2878
2879 struct rsn_pmksa_cache_entry *
2880 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
2881 {
2882         return sm ? sm->pmksa : NULL;
2883 }
2884
2885
2886 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
2887 {
2888         if (sm)
2889                 sm->dot11RSNAStatsTKIPLocalMICFailures++;
2890 }
2891
2892
2893 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
2894 {
2895         if (wpa_auth == NULL)
2896                 return NULL;
2897         *len = wpa_auth->wpa_ie_len;
2898         return wpa_auth->wpa_ie;
2899 }
2900
2901
2902 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
2903                        int session_timeout, struct eapol_state_machine *eapol)
2904 {
2905         if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
2906             sm->wpa_auth->conf.disable_pmksa_caching)
2907                 return -1;
2908
2909         if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
2910                                  sm->wpa_auth->addr, sm->addr, session_timeout,
2911                                  eapol, sm->wpa_key_mgmt))
2912                 return 0;
2913
2914         return -1;
2915 }
2916
2917
2918 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
2919                                const u8 *pmk, size_t len, const u8 *sta_addr,
2920                                int session_timeout,
2921                                struct eapol_state_machine *eapol)
2922 {
2923         if (wpa_auth == NULL)
2924                 return -1;
2925
2926         if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
2927                                  sta_addr, session_timeout, eapol,
2928                                  WPA_KEY_MGMT_IEEE8021X))
2929                 return 0;
2930
2931         return -1;
2932 }
2933
2934
2935 static struct wpa_group *
2936 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
2937 {
2938         struct wpa_group *group;
2939
2940         if (wpa_auth == NULL || wpa_auth->group == NULL)
2941                 return NULL;
2942
2943         wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
2944                    vlan_id);
2945         group = wpa_group_init(wpa_auth, vlan_id, 0);
2946         if (group == NULL)
2947                 return NULL;
2948
2949         group->next = wpa_auth->group->next;
2950         wpa_auth->group->next = group;
2951
2952         return group;
2953 }
2954
2955
2956 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
2957 {
2958         struct wpa_group *group;
2959
2960         if (sm == NULL || sm->wpa_auth == NULL)
2961                 return 0;
2962
2963         group = sm->wpa_auth->group;
2964         while (group) {
2965                 if (group->vlan_id == vlan_id)
2966                         break;
2967                 group = group->next;
2968         }
2969
2970         if (group == NULL) {
2971                 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
2972                 if (group == NULL)
2973                         return -1;
2974         }
2975
2976         if (sm->group == group)
2977                 return 0;
2978
2979         wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
2980                    "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
2981
2982         sm->group = group;
2983         return 0;
2984 }
2985
2986
2987 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
2988                                   struct wpa_state_machine *sm, int ack)
2989 {
2990         if (wpa_auth == NULL || sm == NULL)
2991                 return;
2992         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
2993                    " ack=%d", MAC2STR(sm->addr), ack);
2994         if (sm->pending_1_of_4_timeout && ack) {
2995                 /*
2996                  * Some deployed supplicant implementations update their SNonce
2997                  * for each EAPOL-Key 2/4 message even within the same 4-way
2998                  * handshake and then fail to use the first SNonce when
2999                  * deriving the PTK. This results in unsuccessful 4-way
3000                  * handshake whenever the relatively short initial timeout is
3001                  * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3002                  * around this by increasing the timeout now that we know that
3003                  * the station has received the frame.
3004                  */
3005                 int timeout_ms = eapol_key_timeout_subseq;
3006                 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3007                            "timeout by %u ms because of acknowledged frame",
3008                            timeout_ms);
3009                 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3010                 eloop_register_timeout(timeout_ms / 1000,
3011                                        (timeout_ms % 1000) * 1000,
3012                                        wpa_send_eapol_timeout, wpa_auth, sm);
3013         }
3014 }
3015
3016
3017 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3018 {
3019         if (sm == NULL)
3020                 return 0;
3021         return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3022 }