git.maemo.org Git - wpasupplicant/blob - 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(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
 369                           struct wpa_ssid **selected_ssid)
 370 {
 371         struct wpa_ssid *ssid;
 372         struct wpa_scan_res *bss, *selected = NULL;
 373         size_t i;
 374         struct wpa_blacklist *e;
 375         const u8 *ie;
 376
 377         wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
 378                    group->priority);
 379
 380         bss = NULL;
 381         ssid = NULL;
 382         /* First, try to find WPA-enabled AP */
 383         wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
 384         for (i = 0; i < wpa_s->scan_res->num && !selected; i++) {
 385                 const u8 *ssid_;
 386                 u8 wpa_ie_len, rsn_ie_len, ssid_len;
 387                 bss = wpa_s->scan_res->res[i];
 388
 389                 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
 390                 ssid_ = ie ? ie + 2 : (u8 *) "";
 391                 ssid_len = ie ? ie[1] : 0;
 392
 393                 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 394                 wpa_ie_len = ie ? ie[1] : 0;
 395
 396                 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 397                 rsn_ie_len = ie ? ie[1] : 0;
 398
 399                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 400                            "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
 401                            (int) i, MAC2STR(bss->bssid),
 402                            wpa_ssid_txt(ssid_, ssid_len),
 403                            wpa_ie_len, rsn_ie_len, bss->caps);
 404                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 405                 if (e && e->count > 1) {
 406                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 407                         continue;
 408                 }
 409
 410                 if (wpa_ie_len == 0 && rsn_ie_len == 0) {
 411                         wpa_printf(MSG_DEBUG, "   skip - no WPA/RSN IE");
 412                         continue;
 413                 }
 414
 415                 for (ssid = group; ssid; ssid = ssid->pnext) {
 416                         if (ssid->disabled) {
 417                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 418                                 continue;
 419                         }
 420                         if (ssid_len != ssid->ssid_len ||
 421                             os_memcmp(ssid_, ssid->ssid, ssid_len) != 0) {
 422                                 wpa_printf(MSG_DEBUG, "   skip - "
 423                                            "SSID mismatch");
 424                                 continue;
 425                         }
 426                         if (ssid->bssid_set &&
 427                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 428                         {
 429                                 wpa_printf(MSG_DEBUG, "   skip - "
 430                                            "BSSID mismatch");
 431                                 continue;
 432                         }
 433                         if (wpa_supplicant_ssid_bss_match(ssid, bss)) {
 434                                 selected = bss;
 435                                 *selected_ssid = ssid;
 436                                 wpa_printf(MSG_DEBUG, "   selected WPA AP "
 437                                            MACSTR " ssid='%s'",
 438                                            MAC2STR(bss->bssid),
 439                                            wpa_ssid_txt(ssid_, ssid_len));
 440                                 break;
 441                         }
 442                 }
 443         }
 444
 445         /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
 446          * allows this. */
 447         wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
 448         for (i = 0; i < wpa_s->scan_res->num && !selected; i++) {
 449                 const u8 *ssid_;
 450                 u8 wpa_ie_len, rsn_ie_len, ssid_len;
 451                 bss = wpa_s->scan_res->res[i];
 452
 453                 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
 454                 ssid_ = ie ? ie + 2 : (u8 *) "";
 455                 ssid_len = ie ? ie[1] : 0;
 456
 457                 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 458                 wpa_ie_len = ie ? ie[1] : 0;
 459
 460                 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 461                 rsn_ie_len = ie ? ie[1] : 0;
 462
 463                 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
 464                            "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
 465                            (int) i, MAC2STR(bss->bssid),
 466                            wpa_ssid_txt(ssid_, ssid_len),
 467                            wpa_ie_len, rsn_ie_len, bss->caps);
 468                 e = wpa_blacklist_get(wpa_s, bss->bssid);
 469                 if (e && e->count > 1) {
 470                         wpa_printf(MSG_DEBUG, "   skip - blacklisted");
 471                         continue;
 472                 }
 473                 for (ssid = group; ssid; ssid = ssid->pnext) {
 474                         if (ssid->disabled) {
 475                                 wpa_printf(MSG_DEBUG, "   skip - disabled");
 476                                 continue;
 477                         }
 478                         if (ssid->ssid_len != 0 &&
 479                             (ssid_len != ssid->ssid_len ||
 480                              os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
 481                                 wpa_printf(MSG_DEBUG, "   skip - "
 482                                            "SSID mismatch");
 483                                 continue;
 484                         }
 485
 486                         if (ssid->bssid_set &&
 487                             os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
 488                         {
 489                                 wpa_printf(MSG_DEBUG, "   skip - "
 490                                            "BSSID mismatch");
 491                                 continue;
 492                         }
 493
 494                         if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
 495                             !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
 496                         {
 497                                 wpa_printf(MSG_DEBUG, "   skip - "
 498                                            "non-WPA network not allowed");
 499                                 continue;
 500                         }
 501
 502                         if ((ssid->key_mgmt &
 503                              (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 504                               WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
 505                               WPA_KEY_MGMT_IEEE8021X_SHA256 |
 506                               WPA_KEY_MGMT_PSK_SHA256)) &&
 507                             (wpa_ie_len != 0 || rsn_ie_len != 0)) {
 508                                 wpa_printf(MSG_DEBUG, "   skip - "
 509                                            "WPA network");
 510                                 continue;
 511                         }
 512
 513                         if (!wpa_supplicant_match_privacy(bss, ssid)) {
 514                                 wpa_printf(MSG_DEBUG, "   skip - "
 515                                            "privacy mismatch");
 516                                 continue;
 517                         }
 518
 519                         if (bss->caps & IEEE80211_CAP_IBSS) {
 520                                 wpa_printf(MSG_DEBUG, "   skip - "
 521                                            "IBSS (adhoc) network");
 522                                 continue;
 523                         }
 524
 525                         selected = bss;
 526                         *selected_ssid = ssid;
 527                         wpa_printf(MSG_DEBUG, "   selected non-WPA AP "
 528                                    MACSTR " ssid='%s'",
 529                                    MAC2STR(bss->bssid),
 530                                    wpa_ssid_txt(ssid_, ssid_len));
 531                         break;
 532                 }
 533         }
 534
 535         return selected;
 536 }
 537
 538
 539 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
 540 {
 541         int prio, timeout;
 542         struct wpa_scan_res *selected = NULL;
 543         struct wpa_ssid *ssid = NULL;
 544
 545         if (wpa_supplicant_get_scan_results(wpa_s) < 0) {
 546                 if (wpa_s->conf->ap_scan == 2)
 547                         return;
 548                 wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
 549                            "scanning again");
 550                 timeout = 1;
 551                 goto req_scan;
 552         }
 553
 554         wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
 555
 556         wpa_supplicant_dbus_notify_scan_results(wpa_s);
 557
 558         if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
 559                 return;
 560
 561         while (selected == NULL) {
 562                 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
 563                         selected = wpa_supplicant_select_bss(
 564                                 wpa_s, wpa_s->conf->pssid[prio], &ssid);
 565                         if (selected)
 566                                 break;
 567                 }
 568
 569                 if (selected == NULL && wpa_s->blacklist) {
 570                         wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
 571                                    "and try again");
 572                         wpa_blacklist_clear(wpa_s);
 573                 } else if (selected == NULL) {
 574                         break;
 575                 }
 576         }
 577
 578         if (selected) {
 579                 /* Do not trigger new association unless the BSSID has changed
 580                  * or if reassociation is requested. If we are in process of
 581                  * associating with the selected BSSID, do not trigger new
 582                  * attempt. */
 583                 if (wpa_s->reassociate ||
 584                     (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
 585                      (wpa_s->wpa_state != WPA_ASSOCIATING ||
 586                       os_memcmp(selected->bssid, wpa_s->pending_bssid,
 587                                 ETH_ALEN) != 0))) {
 588                         if (wpa_supplicant_scard_init(wpa_s, ssid)) {
 589                                 wpa_supplicant_req_scan(wpa_s, 10, 0);
 590                                 return;
 591                         }
 592                         wpa_supplicant_associate(wpa_s, selected, ssid);
 593                 } else {
 594                         wpa_printf(MSG_DEBUG, "Already associated with the "
 595                                    "selected AP.");
 596                 }
 597                 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
 598         } else {
 599                 wpa_printf(MSG_DEBUG, "No suitable AP found.");
 600                 timeout = 5;
 601                 goto req_scan;
 602         }
 603
 604         return;
 605
 606 req_scan:
 607         if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
 608                 /*
 609                  * Quick recovery if the initial scan results were not
 610                  * complete when fetched before the first scan request.
 611                  */
 612                 wpa_s->scan_res_tried++;
 613                 timeout = 0;
 614         }
 615         wpa_supplicant_req_scan(wpa_s, timeout, 0);
 616 }
 617 #endif /* CONFIG_NO_SCAN_PROCESSING */
 618
 619
 620 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
 621                                            union wpa_event_data *data)
 622 {
 623         int l, len, found = 0, wpa_found, rsn_found;
 624         u8 *p;
 625
 626         wpa_printf(MSG_DEBUG, "Association info event");
 627         if (data->assoc_info.req_ies)
 628                 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
 629                             data->assoc_info.req_ies_len);
 630         if (data->assoc_info.resp_ies)
 631                 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
 632                             data->assoc_info.resp_ies_len);
 633         if (data->assoc_info.beacon_ies)
 634                 wpa_hexdump(MSG_DEBUG, "beacon_ies",
 635                             data->assoc_info.beacon_ies,
 636                             data->assoc_info.beacon_ies_len);
 637
 638         p = data->assoc_info.req_ies;
 639         l = data->assoc_info.req_ies_len;
 640
 641         /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
 642         while (p && l >= 2) {
 643                 len = p[1] + 2;
 644                 if (len > l) {
 645                         wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
 646                                     p, l);
 647                         break;
 648                 }
 649                 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
 650                      (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
 651                     (p[0] == WLAN_EID_RSN && p[1] >= 2)) {
 652                         if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
 653                                 break;
 654                         found = 1;
 655                         wpa_find_assoc_pmkid(wpa_s);
 656                         break;
 657                 }
 658                 l -= len;
 659                 p += len;
 660         }
 661         if (!found && data->assoc_info.req_ies)
 662                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 663
 664         /* WPA/RSN IE from Beacon/ProbeResp */
 665         p = data->assoc_info.beacon_ies;
 666         l = data->assoc_info.beacon_ies_len;
 667
 668         /* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
 669          */
 670         wpa_found = rsn_found = 0;
 671         while (p && l >= 2) {
 672                 len = p[1] + 2;
 673                 if (len > l) {
 674                         wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
 675                                     p, l);
 676                         break;
 677                 }
 678                 if (!wpa_found &&
 679                     p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
 680                     os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
 681                         wpa_found = 1;
 682                         wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
 683                 }
 684
 685                 if (!rsn_found &&
 686                     p[0] == WLAN_EID_RSN && p[1] >= 2) {
 687                         rsn_found = 1;
 688                         wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
 689                 }
 690
 691                 l -= len;
 692                 p += len;
 693         }
 694
 695         if (!wpa_found && data->assoc_info.beacon_ies)
 696                 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
 697         if (!rsn_found && data->assoc_info.beacon_ies)
 698                 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
 699         if (wpa_found || rsn_found)
 700                 wpa_s->ap_ies_from_associnfo = 1;
 701 }
 702
 703
 704 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
 705                                        union wpa_event_data *data)
 706 {
 707         u8 bssid[ETH_ALEN];
 708         int ft_completed = wpa_ft_is_completed(wpa_s->wpa);
 709
 710         if (data)
 711                 wpa_supplicant_event_associnfo(wpa_s, data);
 712
 713         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
 714         if (wpa_s->use_client_mlme)
 715                 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
 716         if (wpa_s->use_client_mlme ||
 717             (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
 718              os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
 719                 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
 720                         MACSTR, MAC2STR(bssid));
 721                 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
 722                 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 723                 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
 724                         wpa_clear_keys(wpa_s, bssid);
 725                 }
 726                 if (wpa_supplicant_select_config(wpa_s) < 0) {
 727                         wpa_supplicant_disassociate(
 728                                 wpa_s, WLAN_REASON_DEAUTH_LEAVING);
 729                         return;
 730                 }
 731         }
 732
 733         wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
 734         if (wpa_s->current_ssid) {
 735                 /* When using scanning (ap_scan=1), SIM PC/SC interface can be
 736                  * initialized before association, but for other modes,
 737                  * initialize PC/SC here, if the current configuration needs
 738                  * smartcard or SIM/USIM. */
 739                 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
 740         }
 741         wpa_sm_notify_assoc(wpa_s->wpa, bssid);
 742         l2_packet_notify_auth_start(wpa_s->l2);
 743
 744         /*
 745          * Set portEnabled first to FALSE in order to get EAP state machine out
 746          * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
 747          * state machine may transit to AUTHENTICATING state based on obsolete
 748          * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
 749          * AUTHENTICATED without ever giving chance to EAP state machine to
 750          * reset the state.
 751          */
 752         if (!ft_completed) {
 753                 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
 754                 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
 755         }
 756         if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
 757                 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
 758         /* 802.1X::portControl = Auto */
 759         eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
 760         wpa_s->eapol_received = 0;
 761         if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
 762             wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 763                 wpa_supplicant_cancel_auth_timeout(wpa_s);
 764                 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 765         } else if (!ft_completed) {
 766                 /* Timeout for receiving the first EAPOL packet */
 767                 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
 768         }
 769         wpa_supplicant_cancel_scan(wpa_s);
 770
 771         if (wpa_s->driver_4way_handshake &&
 772             wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
 773                 /*
 774                  * We are done; the driver will take care of RSN 4-way
 775                  * handshake.
 776                  */
 777                 wpa_supplicant_cancel_auth_timeout(wpa_s);
 778                 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
 779                 eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
 780                 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
 781         }
 782 }
 783
 784
 785 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
 786 {
 787         const u8 *bssid;
 788
 789         if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 790                 /*
 791                  * At least Host AP driver and a Prism3 card seemed to be
 792                  * generating streams of disconnected events when configuring
 793                  * IBSS for WPA-None. Ignore them for now.
 794                  */
 795                 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
 796                            "IBSS/WPA-None mode");
 797                 return;
 798         }
 799
 800         if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
 801             wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
 802                 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
 803                         "pre-shared key may be incorrect");
 804         }
 805         if (wpa_s->wpa_state >= WPA_ASSOCIATED)
 806                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
 807         bssid = wpa_s->bssid;
 808         if (is_zero_ether_addr(bssid))
 809                 bssid = wpa_s->pending_bssid;
 810         wpa_blacklist_add(wpa_s, bssid);
 811         wpa_sm_notify_disassoc(wpa_s->wpa);
 812         wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
 813                 "remove keys");
 814         if (wpa_supplicant_dynamic_keys(wpa_s)) {
 815                 wpa_s->keys_cleared = 0;
 816                 wpa_clear_keys(wpa_s, wpa_s->bssid);
 817         }
 818         wpa_supplicant_mark_disassoc(wpa_s);
 819 }
 820
 821
 822 static void
 823 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
 824                                          union wpa_event_data *data)
 825 {
 826         int pairwise;
 827         struct os_time t;
 828
 829         wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
 830         pairwise = (data && data->michael_mic_failure.unicast);
 831         wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
 832         os_get_time(&t);
 833         if (wpa_s->last_michael_mic_error &&
 834             t.sec - wpa_s->last_michael_mic_error <= 60) {
 835                 /* initialize countermeasures */
 836                 wpa_s->countermeasures = 1;
 837                 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
 838
 839                 /*
 840                  * Need to wait for completion of request frame. We do not get
 841                  * any callback for the message completion, so just wait a
 842                  * short while and hope for the best. */
 843                 os_sleep(0, 10000);
 844
 845                 wpa_drv_set_countermeasures(wpa_s, 1);
 846                 wpa_supplicant_deauthenticate(wpa_s,
 847                                               WLAN_REASON_MICHAEL_MIC_FAILURE);
 848                 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
 849                                      wpa_s, NULL);
 850                 eloop_register_timeout(60, 0,
 851                                        wpa_supplicant_stop_countermeasures,
 852                                        wpa_s, NULL);
 853                 /* TODO: mark the AP rejected for 60 second. STA is
 854                  * allowed to associate with another AP.. */
 855         }
 856         wpa_s->last_michael_mic_error = t.sec;
 857 }
 858
 859
 860 static void
 861 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
 862                                       union wpa_event_data *data)
 863 {
 864         if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
 865                 return;
 866
 867         switch (data->interface_status.ievent) {
 868         case EVENT_INTERFACE_ADDED:
 869                 if (!wpa_s->interface_removed)
 870                         break;
 871                 wpa_s->interface_removed = 0;
 872                 wpa_printf(MSG_DEBUG, "Configured interface was added.");
 873                 if (wpa_supplicant_driver_init(wpa_s) < 0) {
 874                         wpa_printf(MSG_INFO, "Failed to initialize the driver "
 875                                    "after interface was added.");
 876                 }
 877                 break;
 878         case EVENT_INTERFACE_REMOVED:
 879                 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
 880                 wpa_s->interface_removed = 1;
 881                 wpa_supplicant_mark_disassoc(wpa_s);
 882                 l2_packet_deinit(wpa_s->l2);
 883                 wpa_s->l2 = NULL;
 884                 break;
 885         }
 886 }
 887
 888
 889 #ifdef CONFIG_PEERKEY
 890 static void
 891 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
 892                               union wpa_event_data *data)
 893 {
 894         if (data == NULL)
 895                 return;
 896         wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
 897 }
 898 #endif /* CONFIG_PEERKEY */
 899
 900
 901 #ifdef CONFIG_IEEE80211R
 902 static void
 903 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
 904                                  union wpa_event_data *data)
 905 {
 906         if (data == NULL)
 907                 return;
 908
 909         if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
 910                                     data->ft_ies.ies_len,
 911                                     data->ft_ies.ft_action,
 912                                     data->ft_ies.target_ap) < 0) {
 913                 /* TODO: prevent MLME/driver from trying to associate? */
 914         }
 915 }
 916 #endif /* CONFIG_IEEE80211R */
 917
 918
 919 void wpa_supplicant_event(void *ctx, wpa_event_type event,
 920                           union wpa_event_data *data)
 921 {
 922         struct wpa_supplicant *wpa_s = ctx;
 923
 924         switch (event) {
 925         case EVENT_ASSOC:
 926                 wpa_supplicant_event_assoc(wpa_s, data);
 927                 break;
 928         case EVENT_DISASSOC:
 929                 wpa_supplicant_event_disassoc(wpa_s);
 930                 break;
 931         case EVENT_MICHAEL_MIC_FAILURE:
 932                 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
 933                 break;
 934 #ifndef CONFIG_NO_SCAN_PROCESSING
 935         case EVENT_SCAN_RESULTS:
 936                 wpa_supplicant_event_scan_results(wpa_s);
 937                 break;
 938 #endif /* CONFIG_NO_SCAN_PROCESSING */
 939         case EVENT_ASSOCINFO:
 940                 wpa_supplicant_event_associnfo(wpa_s, data);
 941                 break;
 942         case EVENT_INTERFACE_STATUS:
 943                 wpa_supplicant_event_interface_status(wpa_s, data);
 944                 break;
 945         case EVENT_PMKID_CANDIDATE:
 946                 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
 947                 break;
 948 #ifdef CONFIG_PEERKEY
 949         case EVENT_STKSTART:
 950                 wpa_supplicant_event_stkstart(wpa_s, data);
 951                 break;
 952 #endif /* CONFIG_PEERKEY */
 953 #ifdef CONFIG_IEEE80211R
 954         case EVENT_FT_RESPONSE:
 955                 wpa_supplicant_event_ft_response(wpa_s, data);
 956                 break;
 957 #endif /* CONFIG_IEEE80211R */
 958         default:
 959                 wpa_printf(MSG_INFO, "Unknown event %d", event);
 960                 break;
 961         }
 962 }