wpa_supplicant/events.c

   1 /*
   2  * WPA Supplicant - Driver event processing
   3  * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "eapol_supp/eapol_supp_sm.h"
  19 #include "wpa.h"
  20 #include "eloop.h"
  21 #include "drivers/driver.h"
  22 #include "config.h"
  23 #include "l2_packet/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_peer/eap.h"
  30 #include "ctrl_iface_dbus.h"
  31 #include "ieee802_11_defs.h"
  32 #include "blacklist.h"
  33 #include "wpas_glue.h"
  34 #include "wps_supplicant.h"
  35
  36
  37 static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
  38 {
  39         struct wpa_ssid *ssid;
  40
  41         if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
  42                 return 0;
  43
  44         wpa_printf(MSG_DEBUG, "Select network based on association "
  45                    "information");
  46         ssid = wpa_supplicant_get_ssid(wpa_s);
  47         if (ssid == NULL) {
  48                 wpa_printf(MSG_INFO, "No network configuration found for the "
  49                            "current AP");
  50                 return -1;
  51         }
  52
  53         if (ssid->disabled) {
  54                 wpa_printf(MSG_DEBUG, "Selected network is disabled");
  55                 return -1;
  56         }
  57
  58         wpa_printf(MSG_DEBUG, "Network configuration found for the current "
  59                    "AP");
  60         if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
  61                               WPA_KEY_MGMT_WPA_NONE |
  62                               WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X |
  63                               WPA_KEY_MGMT_PSK_SHA256 |
  64                               WPA_KEY_MGMT_IEEE8021X_SHA256)) {
  65                 u8 wpa_ie[80];
  66                 size_t wpa_ie_len = sizeof(wpa_ie);
  67                 wpa_supplicant_set_suites(wpa_s, NULL, ssid,
  68                                           wpa_ie, &wpa_ie_len);
  69         } else {
  70                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
  71         }
  72
  73         if (wpa_s->current_ssid && wpa_s->current_ssid != ssid)
  74                 eapol_sm_invalidate_cached_session(wpa_s->eapol);
  75         wpa_s->current_ssid = ssid;
  76         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
  77         wpa_supplicant_initiate_eapol(wpa_s);
  78
  79         return 0;
  80 }
  81
  82
  83 static void wpa_supplicant_stop_countermeasures(void *eloop_ctx,
  84                                                 void *sock_ctx)
  85 {
  86         struct wpa_supplicant *wpa_s = eloop_ctx;
  87
  88         if (wpa_s->countermeasures) {
  89                 wpa_s->countermeasures = 0;
  90                 wpa_drv_set_countermeasures(wpa_s, 0);
  91                 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped");
  92                 wpa_supplicant_req_scan(wpa_s, 0, 0);
  93         }
  94 }
  95
  96
  97 void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
  98 {
  99         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 100         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 101         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 102         eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
 103         eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
 104         if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt))
 105                 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
 106         wpa_s->ap_ies_from_associnfo = 0;
 107 }
 108
 109
 110 static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
 111 {
 112         struct wpa_ie_data ie;
 113         int pmksa_set = -1;
 114         size_t i;
 115
 116         if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
 117             ie.pmkid == NULL)
 118                 return;
 119
 120         for (i = 0; i < ie.num_pmkid; i++) {
 121                 pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
 122                                                     ie.pmkid + i * PMKID_LEN,
 123                                                     NULL, NULL, 0);
 124                 if (pmksa_set == 0) {
 125                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 126                         break;
 127                 }
 128         }
 129
 130         wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
 131                    "cache", pmksa_set == 0 ? "" : "not ");
 132 }
 133
 134
 135 static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
 136                                                  union wpa_event_data *data)
 137 {
 138         if (data == NULL) {
 139                 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
 140                 return;
 141         }
 142         wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
 143                    " index=%d preauth=%d",
 144                    MAC2STR(data->pmkid_candidate.bssid),
 145                    data->pmkid_candidate.index,
 146                    data->pmkid_candidate.preauth);
 147
 148         pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
 149                             data->pmkid_candidate.index,
 150                             data->pmkid_candidate.preauth);
 151 }
 152
 153
 154 static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
 155 {
 156         if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
 157             wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
 158                 return 0;
 159
 160 #ifdef IEEE8021X_EAPOL
 161         if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
 162             wpa_s->current_ssid &&
 163             !(wpa_s->current_ssid->eapol_flags &
 164               (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
 165                EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
 166                 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
 167                  * plaintext or static WEP keys). */
 168                 return 0;
 169         }
 170 #endif /* IEEE8021X_EAPOL */
 171
 172         return 1;
 173 }
 174
 175
 176 /**
 177  * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
 178  * @wpa_s: pointer to wpa_supplicant data
 179  * @ssid: Configuration data for the network
 180  * Returns: 0 on success, -1 on failure
 181  *
 182  * This function is called when starting authentication with a network that is
 183  * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
 184  */
 185 int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
 186                               struct wpa_ssid *ssid)
 187 {
 188 #ifdef IEEE8021X_EAPOL
 189         int aka = 0, sim = 0, type;
 190
 191         if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL)
 192                 return 0;
 193
 194         if (ssid->eap.eap_methods == NULL) {
 195                 sim = 1;
 196                 aka = 1;
 197         } else {
 198                 struct eap_method_type *eap = ssid->eap.eap_methods;
 199                 while (eap->vendor != EAP_VENDOR_IETF ||
 200                        eap->method != EAP_TYPE_NONE) {
 201                         if (eap->vendor == EAP_VENDOR_IETF) {
 202                                 if (eap->method == EAP_TYPE_SIM)
 203                                         sim = 1;
 204                                 else if (eap->method == EAP_TYPE_AKA)
 205                                         aka = 1;
 206                         }
 207                         eap++;
 208                 }
 209         }
 210
 211         if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
 212                 sim = 0;
 213         if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
 214                 aka = 0;
 215
 216         if (!sim && !aka) {
 217                 wpa_printf(MSG_DEBUG, "Selected network is configured to use "
 218                            "SIM, but neither EAP-SIM nor EAP-AKA are enabled");
 219                 return 0;
 220         }
 221
 222         wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
 223                    "(sim=%d aka=%d) - initialize PCSC", sim, aka);
 224         if (sim && aka)
 225                 type = SCARD_TRY_BOTH;
 226         else if (aka)
 227                 type = SCARD_USIM_ONLY;
 228         else
 229                 type = SCARD_GSM_SIM_ONLY;
 230
 231         wpa_s->scard = scard_init(type);
 232         if (wpa_s->scard == NULL) {
 233                 wpa_printf(MSG_WARNING, "Failed to initialize SIM "
 234                            "(pcsc-lite)");
 235                 return -1;
 236         }
 237         wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
 238         eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
 239 #endif /* IEEE8021X_EAPOL */
 240
 241         return 0;
 242 }
 243
 244
 245 #ifndef CONFIG_NO_SCAN_PROCESSING
 246 static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss,
 247                                         struct wpa_ssid *ssid)
 248 {
 249         int i, privacy = 0;
 250
 251         if (ssid->mixed_cell)
 252                 return 1;
 253
 254         for (i = 0; i < NUM_WEP_KEYS; i++) {
 255                 if (ssid->wep_key_len[i]) {
 256                         privacy = 1;
 257                         break;
 258                 }
 259         }
 260 #ifdef IEEE8021X_EAPOL
 261         if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
 262             ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
 263                                  EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
 264                 privacy = 1;
 265 #endif /* IEEE8021X_EAPOL */
 266
 267         if (bss->caps & IEEE80211_CAP_PRIVACY)
 268                 return privacy;
 269         return !privacy;
 270 }
 271
 272
 273 static int wpa_supplicant_ssid_bss_match(struct wpa_ssid *ssid,
 274                                          struct wpa_scan_res *bss)
 275 {
 276         struct wpa_ie_data ie;
 277         int proto_match = 0;
 278         const u8 *rsn_ie, *wpa_ie;
 279         int ret;
 280
 281         ret = wpas_wps_ssid_bss_match(ssid, bss);
 282         if (ret >= 0)
 283                 return ret;
 284
 285         rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 286         while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) {
 287                 proto_match++;
 288
 289                 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) {
 290                         wpa_printf(MSG_DEBUG, "   skip RSN IE - parse failed");
 291                         break;
 292                 }
 293                 if (!(ie.proto & ssid->proto)) {
 294                         wpa_printf(MSG_DEBUG, "   skip RSN IE - proto "
 295                                    "mismatch");
 296                         break;
 297                 }
 298
 299                 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
 300                         wpa_printf(MSG_DEBUG, "   skip RSN IE - PTK cipher "
 301                                    "mismatch");
 302                         break;
 303                 }
 304
 305                 if (!(ie.group_cipher & ssid->group_cipher)) {
 306                         wpa_printf(MSG_DEBUG, "   skip RSN IE - GTK cipher "
 307                                    "mismatch");
 308                         break;
 309                 }
 310
 311                 if (!(ie.key_mgmt & ssid->key_mgmt)) {
 312                         wpa_printf(MSG_DEBUG, "   skip RSN IE - key mgmt "
 313                                    "mismatch");
 314                         break;
 315                 }
 316
 317 #ifdef CONFIG_IEEE80211W
 318                 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) &&
 319                     ssid->ieee80211w == IEEE80211W_REQUIRED) {
 320                         wpa_printf(MSG_DEBUG, "   skip RSN IE - no mgmt frame "
 321                                    "protection");
 322                         break;
 323                 }
 324 #endif /* CONFIG_IEEE80211W */
 325
 326                 wpa_printf(MSG_DEBUG, "   selected based on RSN IE");
 327                 return 1;
 328         }
 329
 330         wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 331         while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) {
 332                 proto_match++;
 333
 334                 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) {
 335                         wpa_printf(MSG_DEBUG, "   skip WPA IE - parse failed");
 336                         break;
 337                 }
 338                 if (!(ie.proto & ssid->proto)) {
 339                         wpa_printf(MSG_DEBUG, "   skip WPA IE - proto "
 340                                    "mismatch");
 341                         break;
 342                 }
 343
 344                 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
 345                         wpa_printf(MSG_DEBUG, "   skip WPA IE - PTK cipher "
 346                                    "mismatch");
 347                         break;
 348                 }
 349
 350                 if (!(ie.group_cipher & ssid->group_cipher)) {
 351                         wpa_printf(MSG_DEBUG, "   skip WPA IE - GTK cipher "
 352                                    "mismatch");
 353                         break;
 354                 }
 355
 356                 if (!(ie.key_mgmt & ssid->key_mgmt)) {
 357                         wpa_printf(MSG_DEBUG, "   skip WPA IE - key mgmt "
 358                                    "mismatch");
 359                         break;
 360                 }
 361
 362                 wpa_printf(MSG_DEBUG, "   selected based on WPA IE");
 363                 return 1;
 364         }
 365
 366         if (proto_match == 0)
 367                 wpa_printf(MSG_DEBUG, "   skip - no WPA/RSN proto match");
 368
 369         return 0;
 370 }
 371
 372
 373 static struct wpa_scan_res *
 374 wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
 375                               struct wpa_ssid *group,
 376                               struct wpa_ssid **selected_ssid)
 377 {
 378         struct wpa_ssid *ssid;
 379         struct wpa_scan_res *bss;
 380         size_t i;
 381         struct wpa_blacklist *e;
 382         const u8 *ie;
 383
 384         wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
 385         for (i = 0; i < wpa_s->scan_res->num; i++) {
 386                 const u8 *ssid_;
 387                 u8 wpa_ie_len, rsn_ie_len, ssid_len;
 388                 bss = wpa_s->scan_res->res[i];
 389
 390                 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
 391                 ssid_ = ie ? ie + 2 : (u8 *) "";
 392                 ssid_len = ie ? ie[1] : 0;
 393
 394                 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 395                 wpa_ie_len = ie ? ie[1] : 0;
 396
 397                 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 398                 rsn_ie_len = ie ? ie[1] : 0;
 399
 400                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 401                            "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
 402                            (int) i, MAC2STR(bss->bssid),
 403                            wpa_ssid_txt(ssid_, ssid_len),
 404                            wpa_ie_len, rsn_ie_len, bss->caps);
 405
 406                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 407                 if (e && e->count > 1) {
 408                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 409                         continue;
 410                 }
 411
 412                 if (wpa_ie_len == 0 && rsn_ie_len == 0) {
 413                         wpa_printf(MSG_DEBUG, "   skip - no WPA/RSN IE");
 414                         continue;
 415                 }
 416
 417                 for (ssid = group; ssid; ssid = ssid->pnext) {
 418                         int check_ssid = 1;
 419
 420                         if (ssid->disabled) {
 421                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 422                                 continue;
 423                         }
 424
 425 #ifdef CONFIG_WPS
 426                         if (ssid->ssid_len == 0 &&
 427                             wpas_wps_ssid_wildcard_ok(ssid, bss))
 428                                 check_ssid = 0;
 429 #endif /* CONFIG_WPS */
 430
 431                         if (check_ssid &&
 432                             (ssid_len != ssid->ssid_len ||
 433                              os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
 434                                 wpa_printf(MSG_DEBUG, "   skip - "
 435                                            "SSID mismatch");
 436                                 continue;
 437                         }
 438
 439                         if (ssid->bssid_set &&
 440                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 441                         {
 442                                 wpa_printf(MSG_DEBUG, "   skip - "
 443                                            "BSSID mismatch");
 444                                 continue;
 445                         }
 446
 447                         if (!wpa_supplicant_ssid_bss_match(ssid, bss))
 448                                 continue;
 449
 450                         wpa_printf(MSG_DEBUG, "   selected WPA AP "
 451                                    MACSTR " ssid='%s'",
 452                                    MAC2STR(bss->bssid),
 453                                    wpa_ssid_txt(ssid_, ssid_len));
 454                         *selected_ssid = ssid;
 455                         return bss;
 456                 }
 457         }
 458
 459         return NULL;
 460 }
 461
 462
 463 static struct wpa_scan_res *
 464 wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
 465                                   struct wpa_ssid *group,
 466                                   struct wpa_ssid **selected_ssid)
 467 {
 468         struct wpa_ssid *ssid;
 469         struct wpa_scan_res *bss;
 470         size_t i;
 471         struct wpa_blacklist *e;
 472         const u8 *ie;
 473
 474         wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
 475         for (i = 0; i < wpa_s->scan_res->num; i++) {
 476                 const u8 *ssid_;
 477                 u8 wpa_ie_len, rsn_ie_len, ssid_len;
 478                 bss = wpa_s->scan_res->res[i];
 479
 480                 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
 481                 ssid_ = ie ? ie + 2 : (u8 *) "";
 482                 ssid_len = ie ? ie[1] : 0;
 483
 484                 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 485                 wpa_ie_len = ie ? ie[1] : 0;
 486
 487                 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 488                 rsn_ie_len = ie ? ie[1] : 0;
 489
 490                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 491                            "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
 492                            (int) i, MAC2STR(bss->bssid),
 493                            wpa_ssid_txt(ssid_, ssid_len),
 494                            wpa_ie_len, rsn_ie_len, bss->caps);
 495
 496                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 497                 if (e && e->count > 1) {
 498                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 499                         continue;
 500                 }
 501
 502                 for (ssid = group; ssid; ssid = ssid->pnext) {
 503                         int check_ssid = ssid->ssid_len != 0;
 504
 505                         if (ssid->disabled) {
 506                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 507                                 continue;
 508                         }
 509
 510 #ifdef CONFIG_WPS
 511                         if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 512                                 /* Only allow wildcard SSID match if an AP
 513                                  * advertises active WPS operation that matches
 514                                  * with our mode. */
 515                                 check_ssid = 1;
 516                                 if (ssid->ssid_len == 0 &&
 517                                     wpas_wps_ssid_wildcard_ok(ssid, bss))
 518                                         check_ssid = 0;
 519                         }
 520 #endif /* CONFIG_WPS */
 521
 522                         if (check_ssid &&
 523                             (ssid_len != ssid->ssid_len ||
 524                              os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
 525                                 wpa_printf(MSG_DEBUG, "   skip - "
 526                                            "SSID mismatch");
 527                                 continue;
 528                         }
 529
 530                         if (ssid->bssid_set &&
 531                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 532                         {
 533                                 wpa_printf(MSG_DEBUG, "   skip - "
 534                                            "BSSID mismatch");
 535                                 continue;
 536                         }
 537
 538                         if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
 539                             !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) &&
 540                             !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
 541                         {
 542                                 wpa_printf(MSG_DEBUG, "   skip - "
 543                                            "non-WPA network not allowed");
 544                                 continue;
 545                         }
 546
 547                         if ((ssid->key_mgmt &
 548                              (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 549                               WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
 550                               WPA_KEY_MGMT_IEEE8021X_SHA256 |
 551                               WPA_KEY_MGMT_PSK_SHA256)) &&
 552                             (wpa_ie_len != 0 || rsn_ie_len != 0)) {
 553                                 wpa_printf(MSG_DEBUG, "   skip - "
 554                                            "WPA network");
 555                                 continue;
 556                         }
 557
 558                         if (!wpa_supplicant_match_privacy(bss, ssid)) {
 559                                 wpa_printf(MSG_DEBUG, "   skip - "
 560                                            "privacy mismatch");
 561                                 continue;
 562                         }
 563
 564                         if (bss->caps & IEEE80211_CAP_IBSS) {
 565                                 wpa_printf(MSG_DEBUG, "   skip - "
 566                                            "IBSS (adhoc) network");
 567                                 continue;
 568                         }
 569
 570                         wpa_printf(MSG_DEBUG, "   selected non-WPA AP "
 571                                    MACSTR " ssid='%s'",
 572                                    MAC2STR(bss->bssid),
 573                                    wpa_ssid_txt(ssid_, ssid_len));
 574                         *selected_ssid = ssid;
 575                         return bss;
 576                 }
 577         }
 578
 579         return NULL;
 580 }
 581
 582
 583 static struct wpa_scan_res *
 584 wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
 585                           struct wpa_ssid **selected_ssid)
 586 {
 587         struct wpa_scan_res *selected;
 588
 589         wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
 590                    group->priority);
 591
 592         /* First, try to find WPA-enabled AP */
 593         selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid);
 594         if (selected)
 595                 return selected;
 596
 597         /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
 598          * allows this. */
 599         return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid);
 600 }
 601
 602
 603 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
 604 {
 605         int prio, timeout;
 606         struct wpa_scan_res *selected = NULL;
 607         struct wpa_ssid *ssid = NULL;
 608
 609         if (wpa_supplicant_get_scan_results(wpa_s) < 0) {
 610                 if (wpa_s->conf->ap_scan == 2)
 611                         return;
 612                 wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
 613                            "scanning again");
 614                 timeout = 1;
 615                 goto req_scan;
 616         }
 617
 618         /*
 619          * Don't post the results if this was the initial cached
 620          * and there were no results.
 621          */
 622         if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
 623             wpa_s->scan_res->num == 0) {
 624                 wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
 625                         "empty - not posting");
 626         } else {
 627                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
 628                 wpa_supplicant_dbus_notify_scan_results(wpa_s);
 629         }
 630
 631         if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
 632                 return;
 633
 634         while (selected == NULL) {
 635                 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
 636                         selected = wpa_supplicant_select_bss(
 637                                 wpa_s, wpa_s->conf->pssid[prio], &ssid);
 638                         if (selected)
 639                                 break;
 640                 }
 641
 642                 if (selected == NULL && wpa_s->blacklist) {
 643                         wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
 644                                    "and try again");
 645                         wpa_blacklist_clear(wpa_s);
 646                 } else if (selected == NULL) {
 647                         break;
 648                 }
 649         }
 650
 651         if (selected) {
 652                 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) {
 653                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP
 654                                 "PBC session overlap");
 655                         timeout = 10;
 656                         goto req_scan;
 657                 }
 658
 659                 /* Do not trigger new association unless the BSSID has changed
 660                  * or if reassociation is requested. If we are in process of
 661                  * associating with the selected BSSID, do not trigger new
 662                  * attempt. */
 663                 if (wpa_s->reassociate ||
 664                     (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
 665                      (wpa_s->wpa_state != WPA_ASSOCIATING ||
 666                       os_memcmp(selected->bssid, wpa_s->pending_bssid,
 667                                 ETH_ALEN) != 0))) {
 668                         if (wpa_supplicant_scard_init(wpa_s, ssid)) {
 669                                 wpa_supplicant_req_scan(wpa_s, 10, 0);
 670                                 return;
 671                         }
 672                         wpa_supplicant_associate(wpa_s, selected, ssid);
 673                 } else {
 674                         wpa_printf(MSG_DEBUG, "Already associated with the "
 675                                    "selected AP.");
 676                 }
 677                 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
 678         } else {
 679                 wpa_printf(MSG_DEBUG, "No suitable AP found.");
 680                 timeout = 5;
 681                 goto req_scan;
 682         }
 683
 684         return;
 685
 686 req_scan:
 687         if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
 688                 /*
 689                  * Quick recovery if the initial scan results were not
 690                  * complete when fetched before the first scan request.
 691                  */
 692                 wpa_s->scan_res_tried++;
 693                 timeout = 0;
 694         }
 695         wpa_supplicant_req_scan(wpa_s, timeout, 0);
 696 }
 697 #endif /* CONFIG_NO_SCAN_PROCESSING */
 698
 699
 700 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
 701                                            union wpa_event_data *data)
 702 {
 703         int l, len, found = 0, wpa_found, rsn_found;
 704         u8 *p;
 705
 706         wpa_printf(MSG_DEBUG, "Association info event");
 707         if (data->assoc_info.req_ies)
 708                 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
 709                             data->assoc_info.req_ies_len);
 710         if (data->assoc_info.resp_ies)
 711                 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
 712                             data->assoc_info.resp_ies_len);
 713         if (data->assoc_info.beacon_ies)
 714                 wpa_hexdump(MSG_DEBUG, "beacon_ies",
 715                             data->assoc_info.beacon_ies,
 716                             data->assoc_info.beacon_ies_len);
 717
 718         p = data->assoc_info.req_ies;
 719         l = data->assoc_info.req_ies_len;
 720
 721         /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
 722         while (p && l >= 2) {
 723                 len = p[1] + 2;
 724                 if (len > l) {
 725                         wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
 726                                     p, l);
 727                         break;
 728                 }
 729                 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
 730                      (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
 731                     (p[0] == WLAN_EID_RSN && p[1] >= 2)) {
 732                         if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
 733                                 break;
 734                         found = 1;
 735                         wpa_find_assoc_pmkid(wpa_s);
 736                         break;
 737                 }
 738                 l -= len;
 739                 p += len;
 740         }
 741         if (!found && data->assoc_info.req_ies)
 742                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 743
 744         /* WPA/RSN IE from Beacon/ProbeResp */
 745         p = data->assoc_info.beacon_ies;
 746         l = data->assoc_info.beacon_ies_len;
 747
 748         /* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
 749          */
 750         wpa_found = rsn_found = 0;
 751         while (p && l >= 2) {
 752                 len = p[1] + 2;
 753                 if (len > l) {
 754                         wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
 755                                     p, l);
 756                         break;
 757                 }
 758                 if (!wpa_found &&
 759                     p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
 760                     os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
 761                         wpa_found = 1;
 762                         wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
 763                 }
 764
 765                 if (!rsn_found &&
 766                     p[0] == WLAN_EID_RSN && p[1] >= 2) {
 767                         rsn_found = 1;
 768                         wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
 769                 }
 770
 771                 l -= len;
 772                 p += len;
 773         }
 774
 775         if (!wpa_found && data->assoc_info.beacon_ies)
 776                 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
 777         if (!rsn_found && data->assoc_info.beacon_ies)
 778                 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
 779         if (wpa_found || rsn_found)
 780                 wpa_s->ap_ies_from_associnfo = 1;
 781 }
 782
 783
 784 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
 785                                        union wpa_event_data *data)
 786 {
 787         u8 bssid[ETH_ALEN];
 788         int ft_completed = wpa_ft_is_completed(wpa_s->wpa);
 789
 790         if (data)
 791                 wpa_supplicant_event_associnfo(wpa_s, data);
 792
 793         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
 794         if (wpa_s->use_client_mlme)
 795                 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
 796         if (wpa_s->use_client_mlme ||
 797             (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
 798              os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
 799                 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
 800                         MACSTR, MAC2STR(bssid));
 801                 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
 802                 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 803                 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
 804                         wpa_clear_keys(wpa_s, bssid);
 805                 }
 806                 if (wpa_supplicant_select_config(wpa_s) < 0) {
 807                         wpa_supplicant_disassociate(
 808                                 wpa_s, WLAN_REASON_DEAUTH_LEAVING);
 809                         return;
 810                 }
 811         }
 812
 813         wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
 814         if (wpa_s->current_ssid) {
 815                 /* When using scanning (ap_scan=1), SIM PC/SC interface can be
 816                  * initialized before association, but for other modes,
 817                  * initialize PC/SC here, if the current configuration needs
 818                  * smartcard or SIM/USIM. */
 819                 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
 820         }
 821         wpa_sm_notify_assoc(wpa_s->wpa, bssid);
 822         l2_packet_notify_auth_start(wpa_s->l2);
 823
 824         /*
 825          * Set portEnabled first to FALSE in order to get EAP state machine out
 826          * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
 827          * state machine may transit to AUTHENTICATING state based on obsolete
 828          * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
 829          * AUTHENTICATED without ever giving chance to EAP state machine to
 830          * reset the state.
 831          */
 832         if (!ft_completed) {
 833                 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
 834                 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
 835         }
 836         if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
 837                 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
 838         /* 802.1X::portControl = Auto */
 839         eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
 840         wpa_s->eapol_received = 0;
 841         if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
 842             wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 843                 wpa_supplicant_cancel_auth_timeout(wpa_s);
 844                 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 845         } else if (!ft_completed) {
 846                 /* Timeout for receiving the first EAPOL packet */
 847                 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
 848         }
 849         wpa_supplicant_cancel_scan(wpa_s);
 850
 851         if (wpa_s->driver_4way_handshake &&
 852             wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
 853                 /*
 854                  * We are done; the driver will take care of RSN 4-way
 855                  * handshake.
 856                  */
 857                 wpa_supplicant_cancel_auth_timeout(wpa_s);
 858                 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 859                 eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
 860                 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
 861         }
 862 }
 863
 864
 865 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
 866 {
 867         const u8 *bssid;
 868
 869         if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 870                 /*
 871                  * At least Host AP driver and a Prism3 card seemed to be
 872                  * generating streams of disconnected events when configuring
 873                  * IBSS for WPA-None. Ignore them for now.
 874                  */
 875                 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
 876                            "IBSS/WPA-None mode");
 877                 return;
 878         }
 879
 880         if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
 881             wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
 882                 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
 883                         "pre-shared key may be incorrect");
 884         }
 885         if (wpa_s->wpa_state >= WPA_ASSOCIATED)
 886                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
 887         bssid = wpa_s->bssid;
 888         if (is_zero_ether_addr(bssid))
 889                 bssid = wpa_s->pending_bssid;
 890         wpa_blacklist_add(wpa_s, bssid);
 891         wpa_sm_notify_disassoc(wpa_s->wpa);
 892         wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
 893                 "remove keys");
 894         if (wpa_supplicant_dynamic_keys(wpa_s)) {
 895                 wpa_s->keys_cleared = 0;
 896                 wpa_clear_keys(wpa_s, wpa_s->bssid);
 897         }
 898         wpa_supplicant_mark_disassoc(wpa_s);
 899 }
 900
 901
 902 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
 903 static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx,
 904                                                     void *sock_ctx)
 905 {
 906         struct wpa_supplicant *wpa_s = eloop_ctx;
 907
 908         if (!wpa_s->pending_mic_error_report)
 909                 return;
 910
 911         wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report");
 912         wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise);
 913         wpa_s->pending_mic_error_report = 0;
 914 }
 915 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
 916
 917
 918 static void
 919 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
 920                                          union wpa_event_data *data)
 921 {
 922         int pairwise;
 923         struct os_time t;
 924
 925         wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
 926         pairwise = (data && data->michael_mic_failure.unicast);
 927         os_get_time(&t);
 928         if ((wpa_s->last_michael_mic_error &&
 929              t.sec - wpa_s->last_michael_mic_error <= 60) ||
 930             wpa_s->pending_mic_error_report) {
 931                 if (wpa_s->pending_mic_error_report) {
 932                         /*
 933                          * Send the pending MIC error report immediately since
 934                          * we are going to start countermeasures and AP better
 935                          * do the same.
 936                          */
 937                         wpa_sm_key_request(wpa_s->wpa, 1,
 938                                            wpa_s->pending_mic_error_pairwise);
 939                 }
 940
 941                 /* Send the new MIC error report immediately since we are going
 942                  * to start countermeasures and AP better do the same.
 943                  */
 944                 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
 945
 946                 /* initialize countermeasures */
 947                 wpa_s->countermeasures = 1;
 948                 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
 949
 950                 /*
 951                  * Need to wait for completion of request frame. We do not get
 952                  * any callback for the message completion, so just wait a
 953                  * short while and hope for the best. */
 954                 os_sleep(0, 10000);
 955
 956                 wpa_drv_set_countermeasures(wpa_s, 1);
 957                 wpa_supplicant_deauthenticate(wpa_s,
 958                                               WLAN_REASON_MICHAEL_MIC_FAILURE);
 959                 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
 960                                      wpa_s, NULL);
 961                 eloop_register_timeout(60, 0,
 962                                        wpa_supplicant_stop_countermeasures,
 963                                        wpa_s, NULL);
 964                 /* TODO: mark the AP rejected for 60 second. STA is
 965                  * allowed to associate with another AP.. */
 966         } else {
 967 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
 968                 if (wpa_s->mic_errors_seen) {
 969                         /*
 970                          * Reduce the effectiveness of Michael MIC error
 971                          * reports as a means for attacking against TKIP if
 972                          * more than one MIC failure is noticed with the same
 973                          * PTK. We delay the transmission of the reports by a
 974                          * random time between 0 and 60 seconds in order to
 975                          * force the attacker wait 60 seconds before getting
 976                          * the information on whether a frame resulted in a MIC
 977                          * failure.
 978                          */
 979                         u8 rval[4];
 980                         int sec;
 981
 982                         if (os_get_random(rval, sizeof(rval)) < 0)
 983                                 sec = os_random() % 60;
 984                         else
 985                                 sec = WPA_GET_BE32(rval) % 60;
 986                         wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d "
 987                                    "seconds", sec);
 988                         wpa_s->pending_mic_error_report = 1;
 989                         wpa_s->pending_mic_error_pairwise = pairwise;
 990                         eloop_cancel_timeout(
 991                                 wpa_supplicant_delayed_mic_error_report,
 992                                 wpa_s, NULL);
 993                         eloop_register_timeout(
 994                                 sec, os_random() % 1000000,
 995                                 wpa_supplicant_delayed_mic_error_report,
 996                                 wpa_s, NULL);
 997                 } else {
 998                         wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
 999                 }
1000 #else /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1001                 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1002 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1003         }
1004         wpa_s->last_michael_mic_error = t.sec;
1005         wpa_s->mic_errors_seen++;
1006 }
1007
1008
1009 static void
1010 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
1011                                       union wpa_event_data *data)
1012 {
1013         if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
1014                 return;
1015
1016         switch (data->interface_status.ievent) {
1017         case EVENT_INTERFACE_ADDED:
1018                 if (!wpa_s->interface_removed)
1019                         break;
1020                 wpa_s->interface_removed = 0;
1021                 wpa_printf(MSG_DEBUG, "Configured interface was added.");
1022                 if (wpa_supplicant_driver_init(wpa_s) < 0) {
1023                         wpa_printf(MSG_INFO, "Failed to initialize the driver "
1024                                    "after interface was added.");
1025                 }
1026                 break;
1027         case EVENT_INTERFACE_REMOVED:
1028                 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
1029                 wpa_s->interface_removed = 1;
1030                 wpa_supplicant_mark_disassoc(wpa_s);
1031                 l2_packet_deinit(wpa_s->l2);
1032                 wpa_s->l2 = NULL;
1033                 break;
1034         }
1035 }
1036
1037
1038 #ifdef CONFIG_PEERKEY
1039 static void
1040 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
1041                               union wpa_event_data *data)
1042 {
1043         if (data == NULL)
1044                 return;
1045         wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
1046 }
1047 #endif /* CONFIG_PEERKEY */
1048
1049
1050 #ifdef CONFIG_IEEE80211R
1051 static void
1052 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
1053                                  union wpa_event_data *data)
1054 {
1055         if (data == NULL)
1056                 return;
1057
1058         if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
1059                                     data->ft_ies.ies_len,
1060                                     data->ft_ies.ft_action,
1061                                     data->ft_ies.target_ap) < 0) {
1062                 /* TODO: prevent MLME/driver from trying to associate? */
1063         }
1064 }
1065 #endif /* CONFIG_IEEE80211R */
1066
1067
1068 void wpa_supplicant_event(void *ctx, wpa_event_type event,
1069                           union wpa_event_data *data)
1070 {
1071         struct wpa_supplicant *wpa_s = ctx;
1072
1073         switch (event) {
1074         case EVENT_ASSOC:
1075                 wpa_supplicant_event_assoc(wpa_s, data);
1076                 break;
1077         case EVENT_DISASSOC:
1078                 wpa_supplicant_event_disassoc(wpa_s);
1079                 break;
1080         case EVENT_MICHAEL_MIC_FAILURE:
1081                 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
1082                 break;
1083 #ifndef CONFIG_NO_SCAN_PROCESSING
1084         case EVENT_SCAN_RESULTS:
1085                 wpa_supplicant_event_scan_results(wpa_s);
1086                 break;
1087 #endif /* CONFIG_NO_SCAN_PROCESSING */
1088         case EVENT_ASSOCINFO:
1089                 wpa_supplicant_event_associnfo(wpa_s, data);
1090                 break;
1091         case EVENT_INTERFACE_STATUS:
1092                 wpa_supplicant_event_interface_status(wpa_s, data);
1093                 break;
1094         case EVENT_PMKID_CANDIDATE:
1095                 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
1096                 break;
1097 #ifdef CONFIG_PEERKEY
1098         case EVENT_STKSTART:
1099                 wpa_supplicant_event_stkstart(wpa_s, data);
1100                 break;
1101 #endif /* CONFIG_PEERKEY */
1102 #ifdef CONFIG_IEEE80211R
1103         case EVENT_FT_RESPONSE:
1104                 wpa_supplicant_event_ft_response(wpa_s, data);
1105                 break;
1106 #endif /* CONFIG_IEEE80211R */
1107         default:
1108                 wpa_printf(MSG_INFO, "Unknown event %d", event);
1109                 break;
1110         }
1111 }