events.c

   1 /*
   2  * WPA Supplicant - Driver event processing
   3  * Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "eapol_sm.h"
  19 #include "wpa.h"
  20 #include "eloop.h"
  21 #include "wpa_supplicant.h"
  22 #include "config.h"
  23 #include "l2_packet.h"
  24 #include "wpa_supplicant_i.h"
  25 #include "pcsc_funcs.h"
  26 #include "preauth.h"
  27 #include "pmksa_cache.h"
  28 #include "wpa_ctrl.h"
  29 #include "eap.h"
  30 #include "ctrl_iface_dbus.h"
  31
  32
  33 static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
  34 {
  35         struct wpa_ssid *ssid;
  36
  37         if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
  38                 return 0;
  39
  40         ssid = wpa_supplicant_get_ssid(wpa_s);
  41         if (ssid == NULL) {
  42                 wpa_printf(MSG_INFO, "No network configuration found for the "
  43                            "current AP");
  44                 return -1;
  45         }
  46
  47         if (ssid->disabled) {
  48                 wpa_printf(MSG_DEBUG, "Selected network is disabled");
  49                 return -1;
  50         }
  51
  52         wpa_printf(MSG_DEBUG, "Network configuration found for the current "
  53                    "AP");
  54         if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
  55                               WPA_KEY_MGMT_WPA_NONE)) {
  56                 u8 wpa_ie[80];
  57                 size_t wpa_ie_len = sizeof(wpa_ie);
  58                 wpa_supplicant_set_suites(wpa_s, NULL, ssid,
  59                                           wpa_ie, &wpa_ie_len);
  60         } else {
  61                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
  62         }
  63
  64         if (wpa_s->current_ssid && wpa_s->current_ssid != ssid)
  65                 eapol_sm_invalidate_cached_session(wpa_s->eapol);
  66         wpa_s->current_ssid = ssid;
  67         wpa_sm_set_config(wpa_s->wpa, wpa_s->current_ssid);
  68         wpa_supplicant_initiate_eapol(wpa_s);
  69
  70         return 0;
  71 }
  72
  73
  74 static void wpa_supplicant_stop_countermeasures(void *eloop_ctx,
  75                                                 void *sock_ctx)
  76 {
  77         struct wpa_supplicant *wpa_s = eloop_ctx;
  78
  79         if (wpa_s->countermeasures) {
  80                 wpa_s->countermeasures = 0;
  81                 wpa_drv_set_countermeasures(wpa_s, 0);
  82                 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped");
  83                 wpa_supplicant_req_scan(wpa_s, 0, 0);
  84         }
  85 }
  86
  87
  88 void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
  89 {
  90         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
  91         os_memset(wpa_s->bssid, 0, ETH_ALEN);
  92         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
  93         eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
  94         eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
  95         if (wpa_s->key_mgmt == WPA_KEY_MGMT_PSK)
  96                 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
  97 }
  98
  99
 100 static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
 101 {
 102         struct wpa_ie_data ie;
 103         int i, pmksa_set = -1;
 104
 105         if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
 106             ie.pmkid == NULL)
 107                 return;
 108
 109         for (i = 0; i < ie.num_pmkid; i++) {
 110                 pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
 111                                                     ie.pmkid + i * PMKID_LEN,
 112                                                     NULL, NULL, 0);
 113                 if (pmksa_set == 0) {
 114                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 115                         break;
 116                 }
 117         }
 118
 119         wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
 120                    "cache", pmksa_set == 0 ? "" : "not ");
 121 }
 122
 123
 124 static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
 125                                                  union wpa_event_data *data)
 126 {
 127         if (data == NULL) {
 128                 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
 129                 return;
 130         }
 131         wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
 132                    " index=%d preauth=%d",
 133                    MAC2STR(data->pmkid_candidate.bssid),
 134                    data->pmkid_candidate.index,
 135                    data->pmkid_candidate.preauth);
 136
 137         pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
 138                             data->pmkid_candidate.index,
 139                             data->pmkid_candidate.preauth);
 140 }
 141
 142
 143 static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
 144 {
 145         if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
 146             wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
 147                 return 0;
 148
 149 #ifdef IEEE8021X_EAPOL
 150         if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
 151             wpa_s->current_ssid &&
 152             !(wpa_s->current_ssid->eapol_flags &
 153               (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
 154                EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
 155                 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
 156                  * plaintext or static WEP keys). */
 157                 return 0;
 158         }
 159 #endif /* IEEE8021X_EAPOL */
 160
 161         return 1;
 162 }
 163
 164
 165 /**
 166  * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
 167  * @wpa_s: pointer to wpa_supplicant data
 168  * @ssid: Configuration data for the network
 169  * Returns: 0 on success, -1 on failure
 170  *
 171  * This function is called when starting authentication with a network that is
 172  * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
 173  */
 174 int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
 175                               struct wpa_ssid *ssid)
 176 {
 177 #ifdef IEEE8021X_EAPOL
 178         int aka = 0, sim = 0, type;
 179
 180         if (ssid->pcsc == NULL || wpa_s->scard != NULL)
 181                 return 0;
 182
 183         if (ssid->eap_methods == NULL) {
 184                 sim = 1;
 185                 aka = 1;
 186         } else {
 187                 struct eap_method_type *eap = ssid->eap_methods;
 188                 while (eap->vendor != EAP_VENDOR_IETF ||
 189                        eap->method != EAP_TYPE_NONE) {
 190                         if (eap->vendor == EAP_VENDOR_IETF) {
 191                                 if (eap->method == EAP_TYPE_SIM)
 192                                         sim = 1;
 193                                 else if (eap->method == EAP_TYPE_AKA)
 194                                         aka = 1;
 195                         }
 196                         eap++;
 197                 }
 198         }
 199
 200         if (eap_sm_get_eap_methods(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
 201                 sim = 0;
 202         if (eap_sm_get_eap_methods(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
 203                 aka = 0;
 204
 205         if (!sim && !aka) {
 206                 wpa_printf(MSG_DEBUG, "Selected network is configured to use "
 207                            "SIM, but neither EAP-SIM nor EAP-AKA are enabled");
 208                 return 0;
 209         }
 210
 211         wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
 212                    "(sim=%d aka=%d) - initialize PCSC", sim, aka);
 213         if (sim && aka)
 214                 type = SCARD_TRY_BOTH;
 215         else if (aka)
 216                 type = SCARD_USIM_ONLY;
 217         else
 218                 type = SCARD_GSM_SIM_ONLY;
 219
 220         wpa_s->scard = scard_init(type);
 221         if (wpa_s->scard == NULL) {
 222                 wpa_printf(MSG_WARNING, "Failed to initialize SIM "
 223                            "(pcsc-lite)");
 224                 return -1;
 225         }
 226         wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
 227         eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
 228 #endif /* IEEE8021X_EAPOL */
 229
 230         return 0;
 231 }
 232
 233
 234 static int wpa_supplicant_match_privacy(struct wpa_scan_result *bss,
 235                                         struct wpa_ssid *ssid)
 236 {
 237         int i, privacy = 0;
 238
 239         if (ssid->mixed_cell)
 240                 return 1;
 241
 242         for (i = 0; i < NUM_WEP_KEYS; i++) {
 243                 if (ssid->wep_key_len[i]) {
 244                         privacy = 1;
 245                         break;
 246                 }
 247         }
 248 #ifdef IEEE8021X_EAPOL
 249         if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
 250             ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
 251                                  EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
 252                 privacy = 1;
 253 #endif /* IEEE8021X_EAPOL */
 254
 255         if (bss->caps & IEEE80211_CAP_PRIVACY)
 256                 return privacy;
 257         return !privacy;
 258 }
 259
 260
 261 static int wpa_supplicant_ssid_bss_match(struct wpa_ssid *ssid,
 262                                          struct wpa_scan_result *bss)
 263 {
 264         struct wpa_ie_data ie;
 265         int proto_match = 0;
 266
 267         while ((ssid->proto & WPA_PROTO_RSN) && bss->rsn_ie_len > 0) {
 268                 proto_match++;
 269
 270                 if (wpa_parse_wpa_ie(bss->rsn_ie, bss->rsn_ie_len, &ie)) {
 271                         wpa_printf(MSG_DEBUG, "   skip RSN IE - parse failed");
 272                         break;
 273                 }
 274                 if (!(ie.proto & ssid->proto)) {
 275                         wpa_printf(MSG_DEBUG, "   skip RSN IE - proto "
 276                                    "mismatch");
 277                         break;
 278                 }
 279
 280                 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
 281                         wpa_printf(MSG_DEBUG, "   skip RSN IE - PTK cipher "
 282                                    "mismatch");
 283                         break;
 284                 }
 285
 286                 if (!(ie.group_cipher & ssid->group_cipher)) {
 287                         wpa_printf(MSG_DEBUG, "   skip RSN IE - GTK cipher "
 288                                    "mismatch");
 289                         break;
 290                 }
 291
 292                 if (!(ie.key_mgmt & ssid->key_mgmt)) {
 293                         wpa_printf(MSG_DEBUG, "   skip RSN IE - key mgmt "
 294                                    "mismatch");
 295                         break;
 296                 }
 297
 298 #ifdef CONFIG_IEEE80211W
 299                 if (!(ie.capabilities & WPA_CAPABILITY_MGMT_FRAME_PROTECTION)
 300                     && ssid->ieee80211w == IEEE80211W_REQUIRED) {
 301                         wpa_printf(MSG_DEBUG, "   skip RSN IE - no mgmt frame "
 302                                    "protection");
 303                         break;
 304                 }
 305 #endif /* CONFIG_IEEE80211W */
 306
 307                 wpa_printf(MSG_DEBUG, "   selected based on RSN IE");
 308                 return 1;
 309         }
 310
 311         while ((ssid->proto & WPA_PROTO_WPA) && bss->wpa_ie_len > 0) {
 312                 proto_match++;
 313
 314                 if (wpa_parse_wpa_ie(bss->wpa_ie, bss->wpa_ie_len, &ie)) {
 315                         wpa_printf(MSG_DEBUG, "   skip WPA IE - parse failed");
 316                         break;
 317                 }
 318                 if (!(ie.proto & ssid->proto)) {
 319                         wpa_printf(MSG_DEBUG, "   skip WPA IE - proto "
 320                                    "mismatch");
 321                         break;
 322                 }
 323
 324                 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
 325                         wpa_printf(MSG_DEBUG, "   skip WPA IE - PTK cipher "
 326                                    "mismatch");
 327                         break;
 328                 }
 329
 330                 if (!(ie.group_cipher & ssid->group_cipher)) {
 331                         wpa_printf(MSG_DEBUG, "   skip WPA IE - GTK cipher "
 332                                    "mismatch");
 333                         break;
 334                 }
 335
 336                 if (!(ie.key_mgmt & ssid->key_mgmt)) {
 337                         wpa_printf(MSG_DEBUG, "   skip WPA IE - key mgmt "
 338                                    "mismatch");
 339                         break;
 340                 }
 341
 342                 wpa_printf(MSG_DEBUG, "   selected based on WPA IE");
 343                 return 1;
 344         }
 345
 346         if (proto_match == 0)
 347                 wpa_printf(MSG_DEBUG, "   skip - no WPA/RSN proto match");
 348
 349         return 0;
 350 }
 351
 352
 353 static struct wpa_scan_result *
 354 wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
 355                           struct wpa_scan_result *results, int num,
 356                           struct wpa_ssid **selected_ssid)
 357 {
 358         struct wpa_ssid *ssid;
 359         struct wpa_scan_result *bss, *selected = NULL;
 360         int i;
 361         struct wpa_blacklist *e;
 362
 363         wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
 364                    group->priority);
 365
 366         bss = NULL;
 367         ssid = NULL;
 368         /* First, try to find WPA-enabled AP */
 369         wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
 370         for (i = 0; i < num && !selected; i++) {
 371                 bss = &results[i];
 372                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 373                            "wpa_ie_len=%lu rsn_ie_len=%lu caps=0x%x",
 374                            i, MAC2STR(bss->bssid),
 375                            wpa_ssid_txt(bss->ssid, bss->ssid_len),
 376                            (unsigned long) bss->wpa_ie_len,
 377                            (unsigned long) bss->rsn_ie_len, bss->caps);
 378                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 379                 if (e && e->count > 1) {
 380                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 381                         continue;
 382                 }
 383
 384                 if (bss->wpa_ie_len == 0 && bss->rsn_ie_len == 0) {
 385                         wpa_printf(MSG_DEBUG, "   skip - no WPA/RSN IE");
 386                         continue;
 387                 }
 388
 389                 for (ssid = group; ssid; ssid = ssid->pnext) {
 390                         if (ssid->disabled) {
 391                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 392                                 continue;
 393                         }
 394                         if (bss->ssid_len != ssid->ssid_len ||
 395                             os_memcmp(bss->ssid, ssid->ssid,
 396                                       bss->ssid_len) != 0) {
 397                                 wpa_printf(MSG_DEBUG, "   skip - "
 398                                            "SSID mismatch");
 399                                 continue;
 400                         }
 401                         if (ssid->bssid_set &&
 402                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 403                         {
 404                                 wpa_printf(MSG_DEBUG, "   skip - "
 405                                            "BSSID mismatch");
 406                                 continue;
 407                         }
 408                         if (wpa_supplicant_ssid_bss_match(ssid, bss)) {
 409                                 selected = bss;
 410                                 *selected_ssid = ssid;
 411                                 wpa_printf(MSG_DEBUG, "   selected WPA AP "
 412                                            MACSTR " ssid='%s'",
 413                                            MAC2STR(bss->bssid),
 414                                            wpa_ssid_txt(bss->ssid,
 415                                                         bss->ssid_len));
 416                                 break;
 417                         }
 418                 }
 419         }
 420
 421         /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
 422          * allows this. */
 423         wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
 424         for (i = 0; i < num && !selected; i++) {
 425                 bss = &results[i];
 426                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 427                            "wpa_ie_len=%lu rsn_ie_len=%lu caps=0x%x",
 428                            i, MAC2STR(bss->bssid),
 429                            wpa_ssid_txt(bss->ssid, bss->ssid_len),
 430                            (unsigned long) bss->wpa_ie_len,
 431                            (unsigned long) bss->rsn_ie_len, bss->caps);
 432                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 433                 if (e && e->count > 1) {
 434                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 435                         continue;
 436                 }
 437                 for (ssid = group; ssid; ssid = ssid->pnext) {
 438                         if (ssid->disabled) {
 439                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 440                                 continue;
 441                         }
 442                         if (ssid->ssid_len != 0 &&
 443                             (bss->ssid_len != ssid->ssid_len ||
 444                              os_memcmp(bss->ssid, ssid->ssid,
 445                                        bss->ssid_len) != 0)) {
 446                                 wpa_printf(MSG_DEBUG, "   skip - "
 447                                            "SSID mismatch");
 448                                 continue;
 449                         }
 450
 451                         if (ssid->bssid_set &&
 452                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 453                         {
 454                                 wpa_printf(MSG_DEBUG, "   skip - "
 455                                            "BSSID mismatch");
 456                                 continue;
 457                         }
 458
 459                         if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
 460                             !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
 461                         {
 462                                 wpa_printf(MSG_DEBUG, "   skip - "
 463                                            "non-WPA network not allowed");
 464                                 continue;
 465                         }
 466
 467                         if ((ssid->key_mgmt &
 468                              (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK)) &&
 469                             (bss->wpa_ie_len != 0 || bss->rsn_ie_len != 0)) {
 470                                 wpa_printf(MSG_DEBUG, "   skip - "
 471                                            "WPA network");
 472                                 continue;
 473                         }
 474
 475                         if (!wpa_supplicant_match_privacy(bss, ssid)) {
 476                                 wpa_printf(MSG_DEBUG, "   skip - "
 477                                            "privacy mismatch");
 478                                 continue;
 479                         }
 480
 481                         if (bss->caps & IEEE80211_CAP_IBSS) {
 482                                 wpa_printf(MSG_DEBUG, "   skip - "
 483                                            "IBSS (adhoc) network");
 484                                 continue;
 485                         }
 486
 487                         selected = bss;
 488                         *selected_ssid = ssid;
 489                         wpa_printf(MSG_DEBUG, "   selected non-WPA AP "
 490                                    MACSTR " ssid='%s'",
 491                                    MAC2STR(bss->bssid),
 492                                    wpa_ssid_txt(bss->ssid, bss->ssid_len));
 493                         break;
 494                 }
 495         }
 496
 497         return selected;
 498 }
 499
 500
 501 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
 502 {
 503         int num, prio, timeout;
 504         struct wpa_scan_result *selected = NULL;
 505         struct wpa_ssid *ssid = NULL;
 506         struct wpa_scan_result *results;
 507
 508         if (wpa_supplicant_get_scan_results(wpa_s) < 0) {
 509                 if (wpa_s->conf->ap_scan == 2)
 510                         return;
 511                 wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
 512                            "scanning again");
 513                 timeout = 1;
 514                 goto req_scan;
 515         }
 516
 517         wpa_supplicant_dbus_notify_scan_results(wpa_s);
 518     wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS " Ready"); /* Dm: */
 519
 520         if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
 521                 return;
 522         results = wpa_s->scan_results;
 523         num = wpa_s->num_scan_results;
 524
 525         while (selected == NULL) {
 526                 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
 527                         selected = wpa_supplicant_select_bss(
 528                                 wpa_s, wpa_s->conf->pssid[prio], results, num,
 529                                 &ssid);
 530                         if (selected)
 531                                 break;
 532                 }
 533
 534                 if (selected == NULL && wpa_s->blacklist) {
 535                         wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
 536                                    "and try again");
 537                         wpa_blacklist_clear(wpa_s);
 538                 } else if (selected == NULL) {
 539                         break;
 540                 }
 541         }
 542
 543         if (selected) {
 544                 /* Do not trigger new association unless the BSSID has changed
 545                  * or if reassociation is requested. If we are in process of
 546                  * associating with the selected BSSID, do not trigger new
 547                  * attempt. */
 548                 if (wpa_s->reassociate ||
 549                     (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
 550                      (wpa_s->wpa_state != WPA_ASSOCIATING ||
 551                       os_memcmp(selected->bssid, wpa_s->pending_bssid,
 552                                 ETH_ALEN) != 0))) {
 553                         if (wpa_supplicant_scard_init(wpa_s, ssid)) {
 554                                 wpa_supplicant_req_scan(wpa_s, 10, 0);
 555                                 return;
 556                         }
 557                         wpa_supplicant_associate(wpa_s, selected, ssid);
 558                 } else {
 559                         wpa_printf(MSG_DEBUG, "Already associated with the "
 560                                    "selected AP.");
 561                 }
 562                 rsn_preauth_scan_results(wpa_s->wpa, results, num);
 563         } else {
 564                 wpa_printf(MSG_DEBUG, "No suitable AP found.");
 565 #ifdef ANDROID
 566                 timeout = wpa_s->scan_interval;
 567 #else
 568                 timeout = 5;
 569 #endif
 570                 goto req_scan;
 571         }
 572
 573         return;
 574
 575 req_scan:
 576         if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
 577                 /*
 578                  * Quick recovery if the initial scan results were not
 579                  * complete when fetched before the first scan request.
 580                  */
 581                 wpa_s->scan_res_tried++;
 582                 timeout = 0;
 583         }
 584         wpa_supplicant_req_scan(wpa_s, timeout, 0);
 585 }
 586
 587
 588 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
 589                                            union wpa_event_data *data)
 590 {
 591         int l, len, found = 0, wpa_found, rsn_found;
 592         u8 *p;
 593
 594         wpa_printf(MSG_DEBUG, "Association info event");
 595         if (data->assoc_info.req_ies)
 596                 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
 597                             data->assoc_info.req_ies_len);
 598         if (data->assoc_info.resp_ies)
 599                 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
 600                             data->assoc_info.resp_ies_len);
 601         if (data->assoc_info.beacon_ies)
 602                 wpa_hexdump(MSG_DEBUG, "beacon_ies",
 603                             data->assoc_info.beacon_ies,
 604                             data->assoc_info.beacon_ies_len);
 605
 606         p = data->assoc_info.req_ies;
 607         l = data->assoc_info.req_ies_len;
 608
 609         /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
 610         while (p && l >= 2) {
 611                 len = p[1] + 2;
 612                 if (len > l) {
 613                         wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
 614                                     p, l);
 615                         break;
 616                 }
 617                 if ((p[0] == GENERIC_INFO_ELEM && p[1] >= 6 &&
 618                      (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
 619                     (p[0] == RSN_INFO_ELEM && p[1] >= 2)) {
 620                         if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
 621                                 break;
 622                         found = 1;
 623                         wpa_find_assoc_pmkid(wpa_s);
 624                         break;
 625                 }
 626                 l -= len;
 627                 p += len;
 628         }
 629         if (!found && data->assoc_info.req_ies)
 630                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 631
 632         /* WPA/RSN IE from Beacon/ProbeResp */
 633         p = data->assoc_info.beacon_ies;
 634         l = data->assoc_info.beacon_ies_len;
 635
 636         /* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
 637          */
 638         wpa_found = rsn_found = 0;
 639         while (p && l >= 2) {
 640                 len = p[1] + 2;
 641                 if (len > l) {
 642                         wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
 643                                     p, l);
 644                         break;
 645                 }
 646                 if (!wpa_found &&
 647                     p[0] == GENERIC_INFO_ELEM && p[1] >= 6 &&
 648                     os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
 649                         wpa_found = 1;
 650                         wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
 651                 }
 652
 653                 if (!rsn_found &&
 654                     p[0] == RSN_INFO_ELEM && p[1] >= 2) {
 655                         rsn_found = 1;
 656                         wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
 657                 }
 658
 659                 l -= len;
 660                 p += len;
 661         }
 662
 663         if (!wpa_found && data->assoc_info.beacon_ies)
 664                 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
 665         if (!rsn_found && data->assoc_info.beacon_ies)
 666                 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
 667 }
 668
 669
 670 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
 671                                        union wpa_event_data *data)
 672 {
 673         u8 bssid[ETH_ALEN];
 674
 675         if (data)
 676                 wpa_supplicant_event_associnfo(wpa_s, data);
 677
 678         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
 679         if (wpa_s->use_client_mlme)
 680                 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
 681         if (wpa_s->use_client_mlme ||
 682             (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
 683              os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
 684                 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
 685                         MACSTR, MAC2STR(bssid));
 686                 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
 687                 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 688                 if (wpa_supplicant_dynamic_keys(wpa_s)) {
 689                         wpa_clear_keys(wpa_s, bssid);
 690                 }
 691                 if (wpa_supplicant_select_config(wpa_s) < 0) {
 692                         wpa_supplicant_disassociate(wpa_s,
 693                                                     REASON_DEAUTH_LEAVING);
 694                         return;
 695                 }
 696         }
 697
 698         wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
 699         if (wpa_s->current_ssid) {
 700                 /* When using scanning (ap_scan=1), SIM PC/SC interface can be
 701                  * initialized before association, but for other modes,
 702                  * initialize PC/SC here, if the current configuration needs
 703                  * smartcard or SIM/USIM. */
 704                 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
 705         }
 706         wpa_sm_notify_assoc(wpa_s->wpa, bssid);
 707         l2_packet_notify_auth_start(wpa_s->l2);
 708
 709         /*
 710          * Set portEnabled first to FALSE in order to get EAP state machine out
 711          * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
 712          * state machine may transit to AUTHENTICATING state based on obsolete
 713          * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
 714          * AUTHENTICATED without ever giving chance to EAP state machine to
 715          * reset the state.
 716          */
 717         eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
 718         eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
 719         if (wpa_s->key_mgmt == WPA_KEY_MGMT_PSK)
 720                 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
 721         /* 802.1X::portControl = Auto */
 722         eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
 723         wpa_s->eapol_received = 0;
 724         if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
 725             wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 726                 wpa_supplicant_cancel_auth_timeout(wpa_s);
 727                 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 728         } else {
 729                 /* Timeout for receiving the first EAPOL packet */
 730                 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
 731         }
 732         wpa_supplicant_cancel_scan(wpa_s);
 733 }
 734
 735
 736 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
 737 {
 738         const u8 *bssid;
 739
 740         if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 741                 /*
 742                  * At least Host AP driver and a Prism3 card seemed to be
 743                  * generating streams of disconnected events when configuring
 744                  * IBSS for WPA-None. Ignore them for now.
 745                  */
 746                 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
 747                            "IBSS/WPA-None mode");
 748                 return;
 749         }
 750
 751         if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
 752             wpa_s->key_mgmt == WPA_KEY_MGMT_PSK) {
 753                 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
 754                         "pre-shared key may be incorrect");
 755         }
 756         if (wpa_s->wpa_state >= WPA_ASSOCIATED)
 757                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
 758         bssid = wpa_s->bssid;
 759         if (os_memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
 760                 bssid = wpa_s->pending_bssid;
 761         wpa_blacklist_add(wpa_s, bssid);
 762         wpa_sm_notify_disassoc(wpa_s->wpa);
 763         wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
 764                 "remove keys");
 765         if (wpa_supplicant_dynamic_keys(wpa_s)) {
 766                 wpa_s->keys_cleared = 0;
 767                 wpa_clear_keys(wpa_s, wpa_s->bssid);
 768         }
 769         wpa_supplicant_mark_disassoc(wpa_s);
 770 }
 771
 772
 773 static void
 774 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
 775                                          union wpa_event_data *data)
 776 {
 777         int pairwise;
 778         struct os_time t;
 779
 780         wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
 781         pairwise = (data && data->michael_mic_failure.unicast);
 782         wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
 783         os_get_time(&t);
 784         if (wpa_s->last_michael_mic_error &&
 785             t.sec - wpa_s->last_michael_mic_error <= 60) {
 786                 /* initialize countermeasures */
 787                 wpa_s->countermeasures = 1;
 788                 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
 789
 790                 /*
 791                  * Need to wait for completion of request frame. We do not get
 792                  * any callback for the message completion, so just wait a
 793                  * short while and hope for the best. */
 794                 os_sleep(0, 10000);
 795
 796                 wpa_drv_set_countermeasures(wpa_s, 1);
 797                 wpa_supplicant_deauthenticate(wpa_s,
 798                                               REASON_MICHAEL_MIC_FAILURE);
 799                 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
 800                                      wpa_s, NULL);
 801                 eloop_register_timeout(60, 0,
 802                                        wpa_supplicant_stop_countermeasures,
 803                                        wpa_s, NULL);
 804                 /* TODO: mark the AP rejected for 60 second. STA is
 805                  * allowed to associate with another AP.. */
 806         }
 807         wpa_s->last_michael_mic_error = t.sec;
 808 }
 809
 810
 811 static void
 812 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
 813                                       union wpa_event_data *data)
 814 {
 815         if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
 816                 return;
 817
 818         switch (data->interface_status.ievent) {
 819         case EVENT_INTERFACE_ADDED:
 820                 if (!wpa_s->interface_removed)
 821                         break;
 822                 wpa_s->interface_removed = 0;
 823                 wpa_printf(MSG_DEBUG, "Configured interface was added.");
 824                 if (wpa_supplicant_driver_init(wpa_s, 1) < 0) {
 825                         wpa_printf(MSG_INFO, "Failed to initialize the driver "
 826                                    "after interface was added.");
 827                 }
 828                 break;
 829         case EVENT_INTERFACE_REMOVED:
 830                 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
 831                 wpa_s->interface_removed = 1;
 832                 wpa_supplicant_mark_disassoc(wpa_s);
 833                 l2_packet_deinit(wpa_s->l2);
 834                 wpa_s->l2 = NULL;
 835                 break;
 836         }
 837 }
 838
 839
 840 #ifdef CONFIG_PEERKEY
 841 static void
 842 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
 843                               union wpa_event_data *data)
 844 {
 845         if (data == NULL)
 846                 return;
 847         wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
 848 }
 849 #endif /* CONFIG_PEERKEY */
 850
 851
 852 void wpa_supplicant_event(struct wpa_supplicant *wpa_s, wpa_event_type event,
 853                           union wpa_event_data *data)
 854 {
 855         switch (event) {
 856         case EVENT_ASSOC:
 857                 wpa_supplicant_event_assoc(wpa_s, data);
 858                 break;
 859         case EVENT_DISASSOC:
 860                 wpa_supplicant_event_disassoc(wpa_s);
 861                 break;
 862         case EVENT_MICHAEL_MIC_FAILURE:
 863                 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
 864                 break;
 865         case EVENT_SCAN_RESULTS:
 866                 wpa_supplicant_event_scan_results(wpa_s);
 867                 break;
 868         case EVENT_ASSOCINFO:
 869                 wpa_supplicant_event_associnfo(wpa_s, data);
 870                 break;
 871         case EVENT_INTERFACE_STATUS:
 872                 wpa_supplicant_event_interface_status(wpa_s, data);
 873                 break;
 874         case EVENT_PMKID_CANDIDATE:
 875                 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
 876                 break;
 877 #ifdef CONFIG_PEERKEY
 878         case EVENT_STKSTART:
 879                 wpa_supplicant_event_stkstart(wpa_s, data);
 880                 break;
 881 #endif /* CONFIG_PEERKEY */
 882         default:
 883                 wpa_printf(MSG_INFO, "Unknown event %d", event);
 884                 break;
 885         }
 886 }