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