1/* 2 * WPA Supplicant - Driver event processing 3 * Copyright (c) 2003-2010, 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 "rsn_supp/wpa.h" 20#include "eloop.h" 21#include "config.h" 22#include "l2_packet/l2_packet.h" 23#include "wpa_supplicant_i.h" 24#include "driver_i.h" 25#include "pcsc_funcs.h" 26#include "rsn_supp/preauth.h" 27#include "rsn_supp/pmksa_cache.h" 28#include "common/wpa_ctrl.h" 29#include "eap_peer/eap.h" 30#include "ap/hostapd.h" 31#include "notify.h" 32#include "common/ieee802_11_defs.h" 33#include "blacklist.h" 34#include "wpas_glue.h" 35#include "wps_supplicant.h" 36#include "ibss_rsn.h" 37#include "sme.h" 38#include "bgscan.h" 39#include "ap.h" 40#include "bss.h" 41#include "mlme.h" 42#include "scan.h" 43 44 45static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s) 46{ 47 struct wpa_ssid *ssid, *old_ssid; 48 49 if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid) 50 return 0; 51 52 wpa_printf(MSG_DEBUG, "Select network based on association " 53 "information"); 54 ssid = wpa_supplicant_get_ssid(wpa_s); 55 if (ssid == NULL) { 56 wpa_printf(MSG_INFO, "No network configuration found for the " 57 "current AP"); 58 return -1; 59 } 60 61 if (ssid->disabled) { 62 wpa_printf(MSG_DEBUG, "Selected network is disabled"); 63 return -1; 64 } 65 66 wpa_printf(MSG_DEBUG, "Network configuration found for the current " 67 "AP"); 68 if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X | 69 WPA_KEY_MGMT_WPA_NONE | 70 WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X | 71 WPA_KEY_MGMT_PSK_SHA256 | 72 WPA_KEY_MGMT_IEEE8021X_SHA256)) { 73 u8 wpa_ie[80]; 74 size_t wpa_ie_len = sizeof(wpa_ie); 75 wpa_supplicant_set_suites(wpa_s, NULL, ssid, 76 wpa_ie, &wpa_ie_len); 77 } else { 78 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid); 79 } 80 81 if (wpa_s->current_ssid && wpa_s->current_ssid != ssid) 82 eapol_sm_invalidate_cached_session(wpa_s->eapol); 83 old_ssid = wpa_s->current_ssid; 84 wpa_s->current_ssid = ssid; 85 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid); 86 wpa_supplicant_initiate_eapol(wpa_s); 87 if (old_ssid != wpa_s->current_ssid) 88 wpas_notify_network_changed(wpa_s); 89 90 return 0; 91} 92 93 94static void wpa_supplicant_stop_countermeasures(void *eloop_ctx, 95 void *sock_ctx) 96{ 97 struct wpa_supplicant *wpa_s = eloop_ctx; 98 99 if (wpa_s->countermeasures) { 100 wpa_s->countermeasures = 0; 101 wpa_drv_set_countermeasures(wpa_s, 0); 102 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped"); 103 wpa_supplicant_req_scan(wpa_s, 0, 0); 104 } 105} 106 107 108void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s) 109{ 110 int bssid_changed; 111 112 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 113 bssid_changed = !is_zero_ether_addr(wpa_s->bssid); 114 os_memset(wpa_s->bssid, 0, ETH_ALEN); 115 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 116 wpa_s->current_bss = NULL; 117 if (bssid_changed) 118 wpas_notify_bssid_changed(wpa_s); 119 120 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 121 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 122 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) 123 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 124 wpa_s->ap_ies_from_associnfo = 0; 125} 126 127 128static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s) 129{ 130 struct wpa_ie_data ie; 131 int pmksa_set = -1; 132 size_t i; 133 134 if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 || 135 ie.pmkid == NULL) 136 return; 137 138 for (i = 0; i < ie.num_pmkid; i++) { 139 pmksa_set = pmksa_cache_set_current(wpa_s->wpa, 140 ie.pmkid + i * PMKID_LEN, 141 NULL, NULL, 0); 142 if (pmksa_set == 0) { 143 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1); 144 break; 145 } 146 } 147 148 wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA " 149 "cache", pmksa_set == 0 ? "" : "not "); 150} 151 152 153static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s, 154 union wpa_event_data *data) 155{ 156 if (data == NULL) { 157 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event"); 158 return; 159 } 160 wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR 161 " index=%d preauth=%d", 162 MAC2STR(data->pmkid_candidate.bssid), 163 data->pmkid_candidate.index, 164 data->pmkid_candidate.preauth); 165 166 pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid, 167 data->pmkid_candidate.index, 168 data->pmkid_candidate.preauth); 169} 170 171 172static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s) 173{ 174 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 175 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) 176 return 0; 177 178#ifdef IEEE8021X_EAPOL 179 if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA && 180 wpa_s->current_ssid && 181 !(wpa_s->current_ssid->eapol_flags & 182 (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 183 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) { 184 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either 185 * plaintext or static WEP keys). */ 186 return 0; 187 } 188#endif /* IEEE8021X_EAPOL */ 189 190 return 1; 191} 192 193 194/** 195 * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC 196 * @wpa_s: pointer to wpa_supplicant data 197 * @ssid: Configuration data for the network 198 * Returns: 0 on success, -1 on failure 199 * 200 * This function is called when starting authentication with a network that is 201 * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA). 202 */ 203int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s, 204 struct wpa_ssid *ssid) 205{ 206#ifdef IEEE8021X_EAPOL 207 int aka = 0, sim = 0, type; 208 209 if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL) 210 return 0; 211 212 if (ssid->eap.eap_methods == NULL) { 213 sim = 1; 214 aka = 1; 215 } else { 216 struct eap_method_type *eap = ssid->eap.eap_methods; 217 while (eap->vendor != EAP_VENDOR_IETF || 218 eap->method != EAP_TYPE_NONE) { 219 if (eap->vendor == EAP_VENDOR_IETF) { 220 if (eap->method == EAP_TYPE_SIM) 221 sim = 1; 222 else if (eap->method == EAP_TYPE_AKA) 223 aka = 1; 224 } 225 eap++; 226 } 227 } 228 229 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL) 230 sim = 0; 231 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL) 232 aka = 0; 233 234 if (!sim && !aka) { 235 wpa_printf(MSG_DEBUG, "Selected network is configured to use " 236 "SIM, but neither EAP-SIM nor EAP-AKA are enabled"); 237 return 0; 238 } 239 240 wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM " 241 "(sim=%d aka=%d) - initialize PCSC", sim, aka); 242 if (sim && aka) 243 type = SCARD_TRY_BOTH; 244 else if (aka) 245 type = SCARD_USIM_ONLY; 246 else 247 type = SCARD_GSM_SIM_ONLY; 248 249 wpa_s->scard = scard_init(type); 250 if (wpa_s->scard == NULL) { 251 wpa_printf(MSG_WARNING, "Failed to initialize SIM " 252 "(pcsc-lite)"); 253 return -1; 254 } 255 wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard); 256 eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard); 257#endif /* IEEE8021X_EAPOL */ 258 259 return 0; 260} 261 262 263#ifndef CONFIG_NO_SCAN_PROCESSING 264static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss, 265 struct wpa_ssid *ssid) 266{ 267 int i, privacy = 0; 268 269 if (ssid->mixed_cell) 270 return 1; 271 272#ifdef CONFIG_WPS 273 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) 274 return 1; 275#endif /* CONFIG_WPS */ 276 277 for (i = 0; i < NUM_WEP_KEYS; i++) { 278 if (ssid->wep_key_len[i]) { 279 privacy = 1; 280 break; 281 } 282 } 283#ifdef IEEE8021X_EAPOL 284 if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) && 285 ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 286 EAPOL_FLAG_REQUIRE_KEY_BROADCAST)) 287 privacy = 1; 288#endif /* IEEE8021X_EAPOL */ 289 290 if (bss->caps & IEEE80211_CAP_PRIVACY) 291 return privacy; 292 return !privacy; 293} 294 295 296static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s, 297 struct wpa_ssid *ssid, 298 struct wpa_scan_res *bss) 299{ 300 struct wpa_ie_data ie; 301 int proto_match = 0; 302 const u8 *rsn_ie, *wpa_ie; 303 int ret; 304 305 ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss); 306 if (ret >= 0) 307 return ret; 308 309 rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 310 while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) { 311 proto_match++; 312 313 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) { 314 wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed"); 315 break; 316 } 317 if (!(ie.proto & ssid->proto)) { 318 wpa_printf(MSG_DEBUG, " skip RSN IE - proto " 319 "mismatch"); 320 break; 321 } 322 323 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 324 wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher " 325 "mismatch"); 326 break; 327 } 328 329 if (!(ie.group_cipher & ssid->group_cipher)) { 330 wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher " 331 "mismatch"); 332 break; 333 } 334 335 if (!(ie.key_mgmt & ssid->key_mgmt)) { 336 wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt " 337 "mismatch"); 338 break; 339 } 340 341#ifdef CONFIG_IEEE80211W 342 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) && 343 ssid->ieee80211w == MGMT_FRAME_PROTECTION_REQUIRED) { 344 wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame " 345 "protection"); 346 break; 347 } 348#endif /* CONFIG_IEEE80211W */ 349 350 wpa_printf(MSG_DEBUG, " selected based on RSN IE"); 351 return 1; 352 } 353 354 wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 355 while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) { 356 proto_match++; 357 358 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) { 359 wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed"); 360 break; 361 } 362 if (!(ie.proto & ssid->proto)) { 363 wpa_printf(MSG_DEBUG, " skip WPA IE - proto " 364 "mismatch"); 365 break; 366 } 367 368 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 369 wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher " 370 "mismatch"); 371 break; 372 } 373 374 if (!(ie.group_cipher & ssid->group_cipher)) { 375 wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher " 376 "mismatch"); 377 break; 378 } 379 380 if (!(ie.key_mgmt & ssid->key_mgmt)) { 381 wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt " 382 "mismatch"); 383 break; 384 } 385 386 wpa_printf(MSG_DEBUG, " selected based on WPA IE"); 387 return 1; 388 } 389 390 if (proto_match == 0) 391 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match"); 392 393 return 0; 394} 395 396 397static int freq_allowed(int *freqs, int freq) 398{ 399 int i; 400 401 if (freqs == NULL) 402 return 1; 403 404 for (i = 0; freqs[i]; i++) 405 if (freqs[i] == freq) 406 return 1; 407 return 0; 408} 409 410 411static struct wpa_bss * 412wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s, 413 struct wpa_scan_results *scan_res, 414 struct wpa_ssid *group, 415 struct wpa_ssid **selected_ssid) 416{ 417 struct wpa_ssid *ssid; 418 struct wpa_scan_res *bss; 419 size_t i; 420 struct wpa_blacklist *e; 421 const u8 *ie; 422 423 wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP"); 424 for (i = 0; i < scan_res->num; i++) { 425 const u8 *ssid_; 426 u8 wpa_ie_len, rsn_ie_len, ssid_len; 427 bss = scan_res->res[i]; 428 429 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 430 ssid_ = ie ? ie + 2 : (u8 *) ""; 431 ssid_len = ie ? ie[1] : 0; 432 433 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 434 wpa_ie_len = ie ? ie[1] : 0; 435 436 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 437 rsn_ie_len = ie ? ie[1] : 0; 438 439 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 440 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 441 (int) i, MAC2STR(bss->bssid), 442 wpa_ssid_txt(ssid_, ssid_len), 443 wpa_ie_len, rsn_ie_len, bss->caps); 444 445 e = wpa_blacklist_get(wpa_s, bss->bssid); 446 if (e && e->count > 1) { 447 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 448 continue; 449 } 450 451 if (ssid_len == 0) { 452 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 453 continue; 454 } 455 456 if (wpa_ie_len == 0 && rsn_ie_len == 0) { 457 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE"); 458 continue; 459 } 460 461 for (ssid = group; ssid; ssid = ssid->pnext) { 462 int check_ssid = 1; 463 464 if (ssid->disabled) { 465 wpa_printf(MSG_DEBUG, " skip - disabled"); 466 continue; 467 } 468 469#ifdef CONFIG_WPS 470 if (ssid->ssid_len == 0 && 471 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss)) 472 check_ssid = 0; 473#endif /* CONFIG_WPS */ 474 475 if (check_ssid && 476 (ssid_len != ssid->ssid_len || 477 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 478 wpa_printf(MSG_DEBUG, " skip - " 479 "SSID mismatch"); 480 continue; 481 } 482 483 if (ssid->bssid_set && 484 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 485 { 486 wpa_printf(MSG_DEBUG, " skip - " 487 "BSSID mismatch"); 488 continue; 489 } 490 491 if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss)) 492 continue; 493 494 if (!freq_allowed(ssid->freq_list, bss->freq)) { 495 wpa_printf(MSG_DEBUG, " skip - " 496 "frequency not allowed"); 497 continue; 498 } 499 500 wpa_printf(MSG_DEBUG, " selected WPA AP " 501 MACSTR " ssid='%s'", 502 MAC2STR(bss->bssid), 503 wpa_ssid_txt(ssid_, ssid_len)); 504 *selected_ssid = ssid; 505 return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len); 506 } 507 } 508 509 return NULL; 510} 511 512 513static struct wpa_bss * 514wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s, 515 struct wpa_scan_results *scan_res, 516 struct wpa_ssid *group, 517 struct wpa_ssid **selected_ssid) 518{ 519 struct wpa_ssid *ssid; 520 struct wpa_scan_res *bss; 521 size_t i; 522 struct wpa_blacklist *e; 523 const u8 *ie; 524 525 wpa_printf(MSG_DEBUG, "Try to find non-WPA AP"); 526 for (i = 0; i < scan_res->num; i++) { 527 const u8 *ssid_; 528 u8 wpa_ie_len, rsn_ie_len, ssid_len; 529 bss = scan_res->res[i]; 530 531 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 532 ssid_ = ie ? ie + 2 : (u8 *) ""; 533 ssid_len = ie ? ie[1] : 0; 534 535 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 536 wpa_ie_len = ie ? ie[1] : 0; 537 538 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 539 rsn_ie_len = ie ? ie[1] : 0; 540 541 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 542 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 543 (int) i, MAC2STR(bss->bssid), 544 wpa_ssid_txt(ssid_, ssid_len), 545 wpa_ie_len, rsn_ie_len, bss->caps); 546 547 e = wpa_blacklist_get(wpa_s, bss->bssid); 548 if (e && e->count > 1) { 549 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 550 continue; 551 } 552 553 if (ssid_len == 0) { 554 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 555 continue; 556 } 557 558 for (ssid = group; ssid; ssid = ssid->pnext) { 559 int check_ssid = ssid->ssid_len != 0; 560 561 if (ssid->disabled) { 562 wpa_printf(MSG_DEBUG, " skip - disabled"); 563 continue; 564 } 565 566#ifdef CONFIG_WPS 567 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) { 568 /* Only allow wildcard SSID match if an AP 569 * advertises active WPS operation that matches 570 * with our mode. */ 571 check_ssid = 1; 572 if (ssid->ssid_len == 0 && 573 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, 574 bss)) 575 check_ssid = 0; 576 } 577#endif /* CONFIG_WPS */ 578 579 if (check_ssid && 580 (ssid_len != ssid->ssid_len || 581 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 582 wpa_printf(MSG_DEBUG, " skip - " 583 "SSID mismatch"); 584 continue; 585 } 586 587 if (ssid->bssid_set && 588 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 589 { 590 wpa_printf(MSG_DEBUG, " skip - " 591 "BSSID mismatch"); 592 continue; 593 } 594 595 if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) && 596 !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) && 597 !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA)) 598 { 599 wpa_printf(MSG_DEBUG, " skip - " 600 "non-WPA network not allowed"); 601 continue; 602 } 603 604 if ((ssid->key_mgmt & 605 (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK | 606 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK | 607 WPA_KEY_MGMT_IEEE8021X_SHA256 | 608 WPA_KEY_MGMT_PSK_SHA256)) && 609 (wpa_ie_len != 0 || rsn_ie_len != 0)) { 610 wpa_printf(MSG_DEBUG, " skip - " 611 "WPA network"); 612 continue; 613 } 614 615 if (!wpa_supplicant_match_privacy(bss, ssid)) { 616 wpa_printf(MSG_DEBUG, " skip - " 617 "privacy mismatch"); 618 continue; 619 } 620 621 if (bss->caps & IEEE80211_CAP_IBSS) { 622 wpa_printf(MSG_DEBUG, " skip - " 623 "IBSS (adhoc) network"); 624 continue; 625 } 626 627 if (!freq_allowed(ssid->freq_list, bss->freq)) { 628 wpa_printf(MSG_DEBUG, " skip - " 629 "frequency not allowed"); 630 continue; 631 } 632 633 wpa_printf(MSG_DEBUG, " selected non-WPA AP " 634 MACSTR " ssid='%s'", 635 MAC2STR(bss->bssid), 636 wpa_ssid_txt(ssid_, ssid_len)); 637 *selected_ssid = ssid; 638 return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len); 639 } 640 } 641 642 return NULL; 643} 644 645 646static struct wpa_bss * 647wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, 648 struct wpa_scan_results *scan_res, 649 struct wpa_ssid *group, 650 struct wpa_ssid **selected_ssid) 651{ 652 struct wpa_bss *selected; 653 654 wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d", 655 group->priority); 656 657 /* First, try to find WPA-enabled AP */ 658 selected = wpa_supplicant_select_bss_wpa(wpa_s, scan_res, group, 659 selected_ssid); 660 if (selected) 661 return selected; 662 663 /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration 664 * allows this. */ 665 return wpa_supplicant_select_bss_non_wpa(wpa_s, scan_res, group, 666 selected_ssid); 667} 668 669 670static struct wpa_bss * 671wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s, 672 struct wpa_scan_results *scan_res, 673 struct wpa_ssid **selected_ssid) 674{ 675 struct wpa_bss *selected = NULL; 676 int prio; 677 678 while (selected == NULL) { 679 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) { 680 selected = wpa_supplicant_select_bss( 681 wpa_s, scan_res, wpa_s->conf->pssid[prio], 682 selected_ssid); 683 if (selected) 684 break; 685 } 686 687 if (selected == NULL && wpa_s->blacklist) { 688 wpa_printf(MSG_DEBUG, "No APs found - clear blacklist " 689 "and try again"); 690 wpa_blacklist_clear(wpa_s); 691 wpa_s->blacklist_cleared++; 692 } else if (selected == NULL) 693 break; 694 } 695 696 return selected; 697} 698 699 700static void wpa_supplicant_req_new_scan(struct wpa_supplicant *wpa_s, 701 int timeout_sec, int timeout_usec) 702{ 703 if (!wpa_supplicant_enabled_networks(wpa_s->conf)) { 704 /* 705 * No networks are enabled; short-circuit request so 706 * we don't wait timeout seconds before transitioning 707 * to INACTIVE state. 708 */ 709 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); 710 return; 711 } 712 wpa_supplicant_req_scan(wpa_s, timeout_sec, timeout_usec); 713} 714 715 716void wpa_supplicant_connect(struct wpa_supplicant *wpa_s, 717 struct wpa_bss *selected, 718 struct wpa_ssid *ssid) 719{ 720 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) { 721 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP 722 "PBC session overlap"); 723 wpa_supplicant_req_new_scan(wpa_s, 10, 0); 724 return; 725 } 726 727 /* 728 * Do not trigger new association unless the BSSID has changed or if 729 * reassociation is requested. If we are in process of associating with 730 * the selected BSSID, do not trigger new attempt. 731 */ 732 if (wpa_s->reassociate || 733 (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 && 734 (wpa_s->wpa_state != WPA_ASSOCIATING || 735 os_memcmp(selected->bssid, wpa_s->pending_bssid, ETH_ALEN) != 736 0))) { 737 if (wpa_supplicant_scard_init(wpa_s, ssid)) { 738 wpa_supplicant_req_new_scan(wpa_s, 10, 0); 739 return; 740 } 741 wpa_supplicant_associate(wpa_s, selected, ssid); 742 } else { 743 wpa_printf(MSG_DEBUG, "Already associated with the selected " 744 "AP"); 745 } 746} 747 748 749static struct wpa_ssid * 750wpa_supplicant_pick_new_network(struct wpa_supplicant *wpa_s) 751{ 752 int prio; 753 struct wpa_ssid *ssid; 754 755 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) { 756 for (ssid = wpa_s->conf->pssid[prio]; ssid; ssid = ssid->pnext) 757 { 758 if (ssid->disabled) 759 continue; 760 if (ssid->mode == IEEE80211_MODE_IBSS || 761 ssid->mode == IEEE80211_MODE_AP) 762 return ssid; 763 } 764 } 765 return NULL; 766} 767 768 769/* TODO: move the rsn_preauth_scan_result*() to be called from notify.c based 770 * on BSS added and BSS changed events */ 771static void wpa_supplicant_rsn_preauth_scan_results( 772 struct wpa_supplicant *wpa_s, struct wpa_scan_results *scan_res) 773{ 774 int i; 775 776 if (rsn_preauth_scan_results(wpa_s->wpa) < 0) 777 return; 778 779 for (i = scan_res->num - 1; i >= 0; i--) { 780 const u8 *ssid, *rsn; 781 struct wpa_scan_res *r; 782 783 r = scan_res->res[i]; 784 785 ssid = wpa_scan_get_ie(r, WLAN_EID_SSID); 786 if (ssid == NULL) 787 continue; 788 789 rsn = wpa_scan_get_ie(r, WLAN_EID_RSN); 790 if (rsn == NULL) 791 continue; 792 793 rsn_preauth_scan_result(wpa_s->wpa, r->bssid, ssid, rsn); 794 } 795 796} 797 798 799static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s, 800 struct wpa_bss *selected, 801 struct wpa_ssid *ssid, 802 struct wpa_scan_results *scan_res) 803{ 804 size_t i; 805 struct wpa_scan_res *current_bss = NULL; 806 int min_diff; 807 808 if (wpa_s->reassociate) 809 return 1; /* explicit request to reassociate */ 810 if (wpa_s->wpa_state < WPA_ASSOCIATED) 811 return 1; /* we are not associated; continue */ 812 if (wpa_s->current_ssid == NULL) 813 return 1; /* unknown current SSID */ 814 if (wpa_s->current_ssid != ssid) 815 return 1; /* different network block */ 816 817 for (i = 0; i < scan_res->num; i++) { 818 struct wpa_scan_res *res = scan_res->res[i]; 819 const u8 *ie; 820 if (os_memcmp(res->bssid, wpa_s->bssid, ETH_ALEN) != 0) 821 continue; 822 823 ie = wpa_scan_get_ie(res, WLAN_EID_SSID); 824 if (ie == NULL) 825 continue; 826 if (ie[1] != wpa_s->current_ssid->ssid_len || 827 os_memcmp(ie + 2, wpa_s->current_ssid->ssid, ie[1]) != 0) 828 continue; 829 current_bss = res; 830 break; 831 } 832 833 if (!current_bss) 834 return 1; /* current BSS not seen in scan results */ 835 836 wpa_printf(MSG_DEBUG, "Considering within-ESS reassociation"); 837 wpa_printf(MSG_DEBUG, "Current BSS: " MACSTR " level=%d", 838 MAC2STR(current_bss->bssid), current_bss->level); 839 wpa_printf(MSG_DEBUG, "Selected BSS: " MACSTR " level=%d", 840 MAC2STR(selected->bssid), selected->level); 841 842 if (wpa_s->current_ssid->bssid_set && 843 os_memcmp(selected->bssid, wpa_s->current_ssid->bssid, ETH_ALEN) == 844 0) { 845 wpa_printf(MSG_DEBUG, "Allow reassociation - selected BSS has " 846 "preferred BSSID"); 847 return 1; 848 } 849 850 min_diff = 2; 851 if (current_bss->level < 0) { 852 if (current_bss->level < -85) 853 min_diff = 1; 854 else if (current_bss->level < -80) 855 min_diff = 2; 856 else if (current_bss->level < -75) 857 min_diff = 3; 858 else if (current_bss->level < -70) 859 min_diff = 4; 860 else 861 min_diff = 5; 862 } 863 if (abs(current_bss->level - selected->level) < min_diff) { 864 wpa_printf(MSG_DEBUG, "Skip roam - too small difference in " 865 "signal level"); 866 return 0; 867 } 868 869 return 1; 870} 871 872 873static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s, 874 union wpa_event_data *data) 875{ 876 struct wpa_bss *selected; 877 struct wpa_ssid *ssid = NULL; 878 struct wpa_scan_results *scan_res; 879 int ap = 0; 880 881#ifdef CONFIG_AP 882 if (wpa_s->ap_iface) 883 ap = 1; 884#endif /* CONFIG_AP */ 885 886 wpa_supplicant_notify_scanning(wpa_s, 0); 887 888 scan_res = wpa_supplicant_get_scan_results(wpa_s, 889 data ? &data->scan_info : 890 NULL, 1); 891 if (scan_res == NULL) { 892 if (wpa_s->conf->ap_scan == 2 || ap) 893 return; 894 wpa_printf(MSG_DEBUG, "Failed to get scan results - try " 895 "scanning again"); 896 wpa_supplicant_req_new_scan(wpa_s, 1, 0); 897 return; 898 } 899 900 if (wpa_s->scan_res_handler) { 901 wpa_s->scan_res_handler(wpa_s, scan_res); 902 wpa_s->scan_res_handler = NULL; 903 wpa_scan_results_free(scan_res); 904 return; 905 } 906 907 if (ap) { 908 wpa_printf(MSG_DEBUG, "Ignore scan results in AP mode"); 909 wpa_scan_results_free(scan_res); 910 return; 911 } 912 913 wpa_printf(MSG_DEBUG, "New scan results available"); 914 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); 915 wpas_notify_scan_results(wpa_s); 916 917 wpas_notify_scan_done(wpa_s, 1); 918 919 if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) { 920 wpa_scan_results_free(scan_res); 921 return; 922 } 923 924 if (wpa_s->disconnected) { 925 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 926 wpa_scan_results_free(scan_res); 927 return; 928 } 929 930 if (bgscan_notify_scan(wpa_s) == 1) { 931 wpa_scan_results_free(scan_res); 932 return; 933 } 934 935 wpa_supplicant_rsn_preauth_scan_results(wpa_s, scan_res); 936 937 selected = wpa_supplicant_pick_network(wpa_s, scan_res, &ssid); 938 939 if (selected) { 940 int skip; 941 skip = !wpa_supplicant_need_to_roam(wpa_s, selected, ssid, 942 scan_res); 943 wpa_scan_results_free(scan_res); 944 if (skip) 945 return; 946 wpa_supplicant_connect(wpa_s, selected, ssid); 947 } else { 948 wpa_scan_results_free(scan_res); 949 wpa_printf(MSG_DEBUG, "No suitable network found"); 950 ssid = wpa_supplicant_pick_new_network(wpa_s); 951 if (ssid) { 952 wpa_printf(MSG_DEBUG, "Setup a new network"); 953 wpa_supplicant_associate(wpa_s, NULL, ssid); 954 } else { 955 int timeout_sec = 5; 956 int timeout_usec = 0; 957 wpa_supplicant_req_new_scan(wpa_s, timeout_sec, 958 timeout_usec); 959 } 960 } 961} 962#endif /* CONFIG_NO_SCAN_PROCESSING */ 963 964 965static int wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s, 966 union wpa_event_data *data) 967{ 968 int l, len, found = 0, wpa_found, rsn_found; 969 const u8 *p; 970 971 wpa_printf(MSG_DEBUG, "Association info event"); 972 if (data->assoc_info.req_ies) 973 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies, 974 data->assoc_info.req_ies_len); 975 if (data->assoc_info.resp_ies) 976 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies, 977 data->assoc_info.resp_ies_len); 978 if (data->assoc_info.beacon_ies) 979 wpa_hexdump(MSG_DEBUG, "beacon_ies", 980 data->assoc_info.beacon_ies, 981 data->assoc_info.beacon_ies_len); 982 if (data->assoc_info.freq) 983 wpa_printf(MSG_DEBUG, "freq=%u MHz", data->assoc_info.freq); 984 985 p = data->assoc_info.req_ies; 986 l = data->assoc_info.req_ies_len; 987 988 /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */ 989 while (p && l >= 2) { 990 len = p[1] + 2; 991 if (len > l) { 992 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info", 993 p, l); 994 break; 995 } 996 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 997 (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) || 998 (p[0] == WLAN_EID_RSN && p[1] >= 2)) { 999 if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len)) 1000 break; 1001 found = 1; 1002 wpa_find_assoc_pmkid(wpa_s); 1003 break; 1004 } 1005 l -= len; 1006 p += len; 1007 } 1008 if (!found && data->assoc_info.req_ies) 1009 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0); 1010 1011#ifdef CONFIG_IEEE80211R 1012#ifdef CONFIG_SME 1013 if (wpa_s->sme.auth_alg == WPA_AUTH_ALG_FT) { 1014 u8 bssid[ETH_ALEN]; 1015 if (wpa_drv_get_bssid(wpa_s, bssid) < 0 || 1016 wpa_ft_validate_reassoc_resp(wpa_s->wpa, 1017 data->assoc_info.resp_ies, 1018 data->assoc_info.resp_ies_len, 1019 bssid) < 0) { 1020 wpa_printf(MSG_DEBUG, "FT: Validation of " 1021 "Reassociation Response failed"); 1022 wpa_supplicant_deauthenticate( 1023 wpa_s, WLAN_REASON_INVALID_IE); 1024 return -1; 1025 } 1026 } 1027 1028 p = data->assoc_info.resp_ies; 1029 l = data->assoc_info.resp_ies_len; 1030 1031 /* Go through the IEs and make a copy of the MDIE, if present. */ 1032 while (p && l >= 2) { 1033 len = p[1] + 2; 1034 if (len > l) { 1035 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info", 1036 p, l); 1037 break; 1038 } 1039 if (p[0] == WLAN_EID_MOBILITY_DOMAIN && 1040 p[1] >= MOBILITY_DOMAIN_ID_LEN) { 1041 wpa_s->sme.ft_used = 1; 1042 os_memcpy(wpa_s->sme.mobility_domain, p + 2, 1043 MOBILITY_DOMAIN_ID_LEN); 1044 break; 1045 } 1046 l -= len; 1047 p += len; 1048 } 1049#endif /* CONFIG_SME */ 1050 1051 wpa_sm_set_ft_params(wpa_s->wpa, data->assoc_info.resp_ies, 1052 data->assoc_info.resp_ies_len); 1053#endif /* CONFIG_IEEE80211R */ 1054 1055 /* WPA/RSN IE from Beacon/ProbeResp */ 1056 p = data->assoc_info.beacon_ies; 1057 l = data->assoc_info.beacon_ies_len; 1058 1059 /* Go through the IEs and make a copy of the WPA/RSN IEs, if present. 1060 */ 1061 wpa_found = rsn_found = 0; 1062 while (p && l >= 2) { 1063 len = p[1] + 2; 1064 if (len > l) { 1065 wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies", 1066 p, l); 1067 break; 1068 } 1069 if (!wpa_found && 1070 p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 1071 os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) { 1072 wpa_found = 1; 1073 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len); 1074 } 1075 1076 if (!rsn_found && 1077 p[0] == WLAN_EID_RSN && p[1] >= 2) { 1078 rsn_found = 1; 1079 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len); 1080 } 1081 1082 l -= len; 1083 p += len; 1084 } 1085 1086 if (!wpa_found && data->assoc_info.beacon_ies) 1087 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0); 1088 if (!rsn_found && data->assoc_info.beacon_ies) 1089 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0); 1090 if (wpa_found || rsn_found) 1091 wpa_s->ap_ies_from_associnfo = 1; 1092 1093 wpa_s->assoc_freq = data->assoc_info.freq; 1094 1095 return 0; 1096} 1097 1098 1099static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s, 1100 union wpa_event_data *data) 1101{ 1102 u8 bssid[ETH_ALEN]; 1103 int ft_completed; 1104 int bssid_changed; 1105 struct wpa_driver_capa capa; 1106 1107#ifdef CONFIG_AP 1108 if (wpa_s->ap_iface) { 1109 hostapd_notif_assoc(wpa_s->ap_iface->bss[0], 1110 data->assoc_info.addr, 1111 data->assoc_info.req_ies, 1112 data->assoc_info.req_ies_len); 1113 return; 1114 } 1115#endif /* CONFIG_AP */ 1116 1117 ft_completed = wpa_ft_is_completed(wpa_s->wpa); 1118 if (data && wpa_supplicant_event_associnfo(wpa_s, data) < 0) 1119 return; 1120 1121 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED); 1122 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) 1123 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN); 1124 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) || 1125 (wpa_drv_get_bssid(wpa_s, bssid) >= 0 && 1126 os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) { 1127 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID=" 1128 MACSTR, MAC2STR(bssid)); 1129 bssid_changed = os_memcmp(wpa_s->bssid, bssid, ETH_ALEN); 1130 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN); 1131 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 1132 if (bssid_changed) 1133 wpas_notify_bssid_changed(wpa_s); 1134 1135 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) { 1136 wpa_clear_keys(wpa_s, bssid); 1137 } 1138 if (wpa_supplicant_select_config(wpa_s) < 0) { 1139 wpa_supplicant_disassociate( 1140 wpa_s, WLAN_REASON_DEAUTH_LEAVING); 1141 return; 1142 } 1143 if (wpa_s->current_ssid) { 1144 struct wpa_bss *bss = NULL; 1145 struct wpa_ssid *ssid = wpa_s->current_ssid; 1146 if (ssid->ssid_len > 0) 1147 bss = wpa_bss_get(wpa_s, bssid, 1148 ssid->ssid, ssid->ssid_len); 1149 if (!bss) 1150 bss = wpa_bss_get_bssid(wpa_s, bssid); 1151 if (bss) 1152 wpa_s->current_bss = bss; 1153 } 1154 } 1155 1156#ifdef CONFIG_SME 1157 os_memcpy(wpa_s->sme.prev_bssid, bssid, ETH_ALEN); 1158 wpa_s->sme.prev_bssid_set = 1; 1159#endif /* CONFIG_SME */ 1160 1161 wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid)); 1162 if (wpa_s->current_ssid) { 1163 /* When using scanning (ap_scan=1), SIM PC/SC interface can be 1164 * initialized before association, but for other modes, 1165 * initialize PC/SC here, if the current configuration needs 1166 * smartcard or SIM/USIM. */ 1167 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid); 1168 } 1169 wpa_sm_notify_assoc(wpa_s->wpa, bssid); 1170 if (wpa_s->l2) 1171 l2_packet_notify_auth_start(wpa_s->l2); 1172 1173 /* 1174 * Set portEnabled first to FALSE in order to get EAP state machine out 1175 * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE 1176 * state machine may transit to AUTHENTICATING state based on obsolete 1177 * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to 1178 * AUTHENTICATED without ever giving chance to EAP state machine to 1179 * reset the state. 1180 */ 1181 if (!ft_completed) { 1182 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 1183 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 1184 } 1185 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed) 1186 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 1187 /* 802.1X::portControl = Auto */ 1188 eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE); 1189 wpa_s->eapol_received = 0; 1190 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 1191 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE || 1192 (wpa_s->current_ssid && 1193 wpa_s->current_ssid->mode == IEEE80211_MODE_IBSS)) { 1194 wpa_supplicant_cancel_auth_timeout(wpa_s); 1195 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 1196 } else if (!ft_completed) { 1197 /* Timeout for receiving the first EAPOL packet */ 1198 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0); 1199 } 1200 wpa_supplicant_cancel_scan(wpa_s); 1201 1202 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE) && 1203 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 1204 /* 1205 * We are done; the driver will take care of RSN 4-way 1206 * handshake. 1207 */ 1208 wpa_supplicant_cancel_auth_timeout(wpa_s); 1209 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 1210 eapol_sm_notify_portValid(wpa_s->eapol, TRUE); 1211 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE); 1212 } 1213 1214 if (wpa_s->pending_eapol_rx) { 1215 struct os_time now, age; 1216 os_get_time(&now); 1217 os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age); 1218 if (age.sec == 0 && age.usec < 100000 && 1219 os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) == 1220 0) { 1221 wpa_printf(MSG_DEBUG, "Process pending EAPOL frame " 1222 "that was received just before association " 1223 "notification"); 1224 wpa_supplicant_rx_eapol( 1225 wpa_s, wpa_s->pending_eapol_rx_src, 1226 wpabuf_head(wpa_s->pending_eapol_rx), 1227 wpabuf_len(wpa_s->pending_eapol_rx)); 1228 } 1229 wpabuf_free(wpa_s->pending_eapol_rx); 1230 wpa_s->pending_eapol_rx = NULL; 1231 } 1232 1233#ifdef CONFIG_BGSCAN 1234 if (wpa_s->current_ssid != wpa_s->bgscan_ssid) { 1235 bgscan_deinit(wpa_s); 1236 if (wpa_s->current_ssid && wpa_s->current_ssid->bgscan) { 1237 if (bgscan_init(wpa_s, wpa_s->current_ssid)) { 1238 wpa_printf(MSG_DEBUG, "Failed to initialize " 1239 "bgscan"); 1240 /* 1241 * Live without bgscan; it is only used as a 1242 * roaming optimization, so the initial 1243 * connection is not affected. 1244 */ 1245 } else 1246 wpa_s->bgscan_ssid = wpa_s->current_ssid; 1247 } else 1248 wpa_s->bgscan_ssid = NULL; 1249 } 1250#endif /* CONFIG_BGSCAN */ 1251 1252 if ((wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 1253 wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA) && 1254 wpa_s->current_ssid && wpa_drv_get_capa(wpa_s, &capa) == 0 && 1255 capa.flags & WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE) { 1256 /* Set static WEP keys again */ 1257 wpa_set_wep_keys(wpa_s, wpa_s->current_ssid); 1258 } 1259} 1260 1261 1262static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s, 1263 u16 reason_code) 1264{ 1265 const u8 *bssid; 1266#ifdef CONFIG_SME 1267 int authenticating; 1268 u8 prev_pending_bssid[ETH_ALEN]; 1269 1270 authenticating = wpa_s->wpa_state == WPA_AUTHENTICATING; 1271 os_memcpy(prev_pending_bssid, wpa_s->pending_bssid, ETH_ALEN); 1272#endif /* CONFIG_SME */ 1273 1274 if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 1275 /* 1276 * At least Host AP driver and a Prism3 card seemed to be 1277 * generating streams of disconnected events when configuring 1278 * IBSS for WPA-None. Ignore them for now. 1279 */ 1280 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in " 1281 "IBSS/WPA-None mode"); 1282 return; 1283 } 1284 1285 if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE && 1286 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 1287 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - " 1288 "pre-shared key may be incorrect"); 1289 } 1290 if (wpa_s->wpa_state >= WPA_ASSOCIATED) 1291 wpa_supplicant_req_scan(wpa_s, 0, 100000); 1292 bssid = wpa_s->bssid; 1293 if (is_zero_ether_addr(bssid)) 1294 bssid = wpa_s->pending_bssid; 1295 wpa_blacklist_add(wpa_s, bssid); 1296 wpa_sm_notify_disassoc(wpa_s->wpa); 1297 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "bssid=" MACSTR 1298 " reason=%d", 1299 MAC2STR(bssid), reason_code); 1300 if (wpa_supplicant_dynamic_keys(wpa_s)) { 1301 wpa_printf(MSG_DEBUG, "Disconnect event - remove keys"); 1302 wpa_s->keys_cleared = 0; 1303 wpa_clear_keys(wpa_s, wpa_s->bssid); 1304 } 1305 wpa_supplicant_mark_disassoc(wpa_s); 1306 bgscan_deinit(wpa_s); 1307 wpa_s->bgscan_ssid = NULL; 1308#ifdef CONFIG_SME 1309 if (authenticating && 1310 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) { 1311 /* 1312 * mac80211-workaround to force deauth on failed auth cmd, 1313 * requires us to remain in authenticating state to allow the 1314 * second authentication attempt to be continued properly. 1315 */ 1316 wpa_printf(MSG_DEBUG, "SME: Allow pending authentication to " 1317 "proceed after disconnection event"); 1318 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING); 1319 os_memcpy(wpa_s->pending_bssid, prev_pending_bssid, ETH_ALEN); 1320 } 1321#endif /* CONFIG_SME */ 1322} 1323 1324 1325#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 1326static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx, 1327 void *sock_ctx) 1328{ 1329 struct wpa_supplicant *wpa_s = eloop_ctx; 1330 1331 if (!wpa_s->pending_mic_error_report) 1332 return; 1333 1334 wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report"); 1335 wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise); 1336 wpa_s->pending_mic_error_report = 0; 1337} 1338#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1339 1340 1341static void 1342wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s, 1343 union wpa_event_data *data) 1344{ 1345 int pairwise; 1346 struct os_time t; 1347 1348 wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected"); 1349 pairwise = (data && data->michael_mic_failure.unicast); 1350 os_get_time(&t); 1351 if ((wpa_s->last_michael_mic_error && 1352 t.sec - wpa_s->last_michael_mic_error <= 60) || 1353 wpa_s->pending_mic_error_report) { 1354 if (wpa_s->pending_mic_error_report) { 1355 /* 1356 * Send the pending MIC error report immediately since 1357 * we are going to start countermeasures and AP better 1358 * do the same. 1359 */ 1360 wpa_sm_key_request(wpa_s->wpa, 1, 1361 wpa_s->pending_mic_error_pairwise); 1362 } 1363 1364 /* Send the new MIC error report immediately since we are going 1365 * to start countermeasures and AP better do the same. 1366 */ 1367 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1368 1369 /* initialize countermeasures */ 1370 wpa_s->countermeasures = 1; 1371 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started"); 1372 1373 /* 1374 * Need to wait for completion of request frame. We do not get 1375 * any callback for the message completion, so just wait a 1376 * short while and hope for the best. */ 1377 os_sleep(0, 10000); 1378 1379 wpa_drv_set_countermeasures(wpa_s, 1); 1380 wpa_supplicant_deauthenticate(wpa_s, 1381 WLAN_REASON_MICHAEL_MIC_FAILURE); 1382 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures, 1383 wpa_s, NULL); 1384 eloop_register_timeout(60, 0, 1385 wpa_supplicant_stop_countermeasures, 1386 wpa_s, NULL); 1387 /* TODO: mark the AP rejected for 60 second. STA is 1388 * allowed to associate with another AP.. */ 1389 } else { 1390#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 1391 if (wpa_s->mic_errors_seen) { 1392 /* 1393 * Reduce the effectiveness of Michael MIC error 1394 * reports as a means for attacking against TKIP if 1395 * more than one MIC failure is noticed with the same 1396 * PTK. We delay the transmission of the reports by a 1397 * random time between 0 and 60 seconds in order to 1398 * force the attacker wait 60 seconds before getting 1399 * the information on whether a frame resulted in a MIC 1400 * failure. 1401 */ 1402 u8 rval[4]; 1403 int sec; 1404 1405 if (os_get_random(rval, sizeof(rval)) < 0) 1406 sec = os_random() % 60; 1407 else 1408 sec = WPA_GET_BE32(rval) % 60; 1409 wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d " 1410 "seconds", sec); 1411 wpa_s->pending_mic_error_report = 1; 1412 wpa_s->pending_mic_error_pairwise = pairwise; 1413 eloop_cancel_timeout( 1414 wpa_supplicant_delayed_mic_error_report, 1415 wpa_s, NULL); 1416 eloop_register_timeout( 1417 sec, os_random() % 1000000, 1418 wpa_supplicant_delayed_mic_error_report, 1419 wpa_s, NULL); 1420 } else { 1421 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1422 } 1423#else /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1424 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1425#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1426 } 1427 wpa_s->last_michael_mic_error = t.sec; 1428 wpa_s->mic_errors_seen++; 1429} 1430 1431 1432#ifdef CONFIG_TERMINATE_ONLASTIF 1433static int any_interfaces(struct wpa_supplicant *head) 1434{ 1435 struct wpa_supplicant *wpa_s; 1436 1437 for (wpa_s = head; wpa_s != NULL; wpa_s = wpa_s->next) 1438 if (!wpa_s->interface_removed) 1439 return 1; 1440 return 0; 1441} 1442#endif /* CONFIG_TERMINATE_ONLASTIF */ 1443 1444 1445static void 1446wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s, 1447 union wpa_event_data *data) 1448{ 1449 if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0) 1450 return; 1451 1452 switch (data->interface_status.ievent) { 1453 case EVENT_INTERFACE_ADDED: 1454 if (!wpa_s->interface_removed) 1455 break; 1456 wpa_s->interface_removed = 0; 1457 wpa_printf(MSG_DEBUG, "Configured interface was added."); 1458 if (wpa_supplicant_driver_init(wpa_s) < 0) { 1459 wpa_printf(MSG_INFO, "Failed to initialize the driver " 1460 "after interface was added."); 1461 } 1462 break; 1463 case EVENT_INTERFACE_REMOVED: 1464 wpa_printf(MSG_DEBUG, "Configured interface was removed."); 1465 wpa_s->interface_removed = 1; 1466 wpa_supplicant_mark_disassoc(wpa_s); 1467 l2_packet_deinit(wpa_s->l2); 1468 wpa_s->l2 = NULL; 1469#ifdef CONFIG_TERMINATE_ONLASTIF 1470 /* check if last interface */ 1471 if (!any_interfaces(wpa_s->global->ifaces)) 1472 eloop_terminate(); 1473#endif /* CONFIG_TERMINATE_ONLASTIF */ 1474 break; 1475 } 1476} 1477 1478 1479#ifdef CONFIG_PEERKEY 1480static void 1481wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s, 1482 union wpa_event_data *data) 1483{ 1484 if (data == NULL) 1485 return; 1486 wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer); 1487} 1488#endif /* CONFIG_PEERKEY */ 1489 1490 1491#ifdef CONFIG_IEEE80211R 1492static void 1493wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s, 1494 union wpa_event_data *data) 1495{ 1496 if (data == NULL) 1497 return; 1498 1499 if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies, 1500 data->ft_ies.ies_len, 1501 data->ft_ies.ft_action, 1502 data->ft_ies.target_ap, 1503 data->ft_ies.ric_ies, 1504 data->ft_ies.ric_ies_len) < 0) { 1505 /* TODO: prevent MLME/driver from trying to associate? */ 1506 } 1507} 1508#endif /* CONFIG_IEEE80211R */ 1509 1510 1511#ifdef CONFIG_IBSS_RSN 1512static void wpa_supplicant_event_ibss_rsn_start(struct wpa_supplicant *wpa_s, 1513 union wpa_event_data *data) 1514{ 1515 if (data == NULL) 1516 return; 1517 ibss_rsn_start(wpa_s->ibss_rsn, data->ibss_rsn_start.peer); 1518} 1519#endif /* CONFIG_IBSS_RSN */ 1520 1521 1522#ifdef CONFIG_IEEE80211R 1523static void ft_rx_action(struct wpa_supplicant *wpa_s, const u8 *data, 1524 size_t len) 1525{ 1526 const u8 *sta_addr, *target_ap_addr; 1527 u16 status; 1528 1529 wpa_hexdump(MSG_MSGDUMP, "FT: RX Action", data, len); 1530 if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) 1531 return; /* only SME case supported for now */ 1532 if (len < 1 + 2 * ETH_ALEN + 2) 1533 return; 1534 if (data[0] != 2) 1535 return; /* Only FT Action Response is supported for now */ 1536 sta_addr = data + 1; 1537 target_ap_addr = data + 1 + ETH_ALEN; 1538 status = WPA_GET_LE16(data + 1 + 2 * ETH_ALEN); 1539 wpa_printf(MSG_DEBUG, "FT: Received FT Action Response: STA " MACSTR 1540 " TargetAP " MACSTR " status %u", 1541 MAC2STR(sta_addr), MAC2STR(target_ap_addr), status); 1542 1543 if (os_memcmp(sta_addr, wpa_s->own_addr, ETH_ALEN) != 0) { 1544 wpa_printf(MSG_DEBUG, "FT: Foreign STA Address " MACSTR 1545 " in FT Action Response", MAC2STR(sta_addr)); 1546 return; 1547 } 1548 1549 if (status) { 1550 wpa_printf(MSG_DEBUG, "FT: FT Action Response indicates " 1551 "failure (status code %d)", status); 1552 /* TODO: report error to FT code(?) */ 1553 return; 1554 } 1555 1556 if (wpa_ft_process_response(wpa_s->wpa, data + 1 + 2 * ETH_ALEN + 2, 1557 len - (1 + 2 * ETH_ALEN + 2), 1, 1558 target_ap_addr, NULL, 0) < 0) 1559 return; 1560 1561#ifdef CONFIG_SME 1562 { 1563 struct wpa_bss *bss; 1564 bss = wpa_bss_get_bssid(wpa_s, target_ap_addr); 1565 if (bss) 1566 wpa_s->sme.freq = bss->freq; 1567 wpa_s->sme.auth_alg = WPA_AUTH_ALG_FT; 1568 sme_associate(wpa_s, WPAS_MODE_INFRA, target_ap_addr, 1569 WLAN_AUTH_FT); 1570 } 1571#endif /* CONFIG_SME */ 1572} 1573#endif /* CONFIG_IEEE80211R */ 1574 1575 1576void wpa_supplicant_event(void *ctx, enum wpa_event_type event, 1577 union wpa_event_data *data) 1578{ 1579 struct wpa_supplicant *wpa_s = ctx; 1580 u16 reason_code = 0; 1581 1582 switch (event) { 1583 case EVENT_AUTH: 1584 sme_event_auth(wpa_s, data); 1585 break; 1586 case EVENT_ASSOC: 1587 wpa_supplicant_event_assoc(wpa_s, data); 1588 break; 1589 case EVENT_DISASSOC: 1590 wpa_printf(MSG_DEBUG, "Disassociation notification"); 1591#ifdef CONFIG_AP 1592 if (wpa_s->ap_iface && data && data->disassoc_info.addr) { 1593 hostapd_notif_disassoc(wpa_s->ap_iface->bss[0], 1594 data->disassoc_info.addr); 1595 break; 1596 } 1597#endif /* CONFIG_AP */ 1598 if (data) 1599 reason_code = data->deauth_info.reason_code; 1600 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME) 1601 sme_event_disassoc(wpa_s, data); 1602 /* fall through */ 1603 case EVENT_DEAUTH: 1604 if (event == EVENT_DEAUTH) { 1605 wpa_printf(MSG_DEBUG, "Deauthentication notification"); 1606 if (data) 1607 reason_code = data->deauth_info.reason_code; 1608 } 1609#ifdef CONFIG_AP 1610 if (wpa_s->ap_iface && data && data->deauth_info.addr) { 1611 hostapd_notif_disassoc(wpa_s->ap_iface->bss[0], 1612 data->deauth_info.addr); 1613 break; 1614 } 1615#endif /* CONFIG_AP */ 1616 wpa_supplicant_event_disassoc(wpa_s, reason_code); 1617 break; 1618 case EVENT_MICHAEL_MIC_FAILURE: 1619 wpa_supplicant_event_michael_mic_failure(wpa_s, data); 1620 break; 1621#ifndef CONFIG_NO_SCAN_PROCESSING 1622 case EVENT_SCAN_RESULTS: 1623 wpa_supplicant_event_scan_results(wpa_s, data); 1624 break; 1625#endif /* CONFIG_NO_SCAN_PROCESSING */ 1626 case EVENT_ASSOCINFO: 1627 wpa_supplicant_event_associnfo(wpa_s, data); 1628 break; 1629 case EVENT_INTERFACE_STATUS: 1630 wpa_supplicant_event_interface_status(wpa_s, data); 1631 break; 1632 case EVENT_PMKID_CANDIDATE: 1633 wpa_supplicant_event_pmkid_candidate(wpa_s, data); 1634 break; 1635#ifdef CONFIG_PEERKEY 1636 case EVENT_STKSTART: 1637 wpa_supplicant_event_stkstart(wpa_s, data); 1638 break; 1639#endif /* CONFIG_PEERKEY */ 1640#ifdef CONFIG_IEEE80211R 1641 case EVENT_FT_RESPONSE: 1642 wpa_supplicant_event_ft_response(wpa_s, data); 1643 break; 1644#endif /* CONFIG_IEEE80211R */ 1645#ifdef CONFIG_IBSS_RSN 1646 case EVENT_IBSS_RSN_START: 1647 wpa_supplicant_event_ibss_rsn_start(wpa_s, data); 1648 break; 1649#endif /* CONFIG_IBSS_RSN */ 1650 case EVENT_ASSOC_REJECT: 1651 sme_event_assoc_reject(wpa_s, data); 1652 break; 1653 case EVENT_AUTH_TIMED_OUT: 1654 sme_event_auth_timed_out(wpa_s, data); 1655 break; 1656 case EVENT_ASSOC_TIMED_OUT: 1657 sme_event_assoc_timed_out(wpa_s, data); 1658 break; 1659#ifdef CONFIG_AP 1660 case EVENT_TX_STATUS: 1661 if (wpa_s->ap_iface == NULL) 1662 break; 1663 switch (data->tx_status.type) { 1664 case WLAN_FC_TYPE_MGMT: 1665 ap_mgmt_tx_cb(wpa_s, data->tx_status.data, 1666 data->tx_status.data_len, 1667 data->tx_status.stype, 1668 data->tx_status.ack); 1669 break; 1670 case WLAN_FC_TYPE_DATA: 1671 ap_tx_status(wpa_s, data->tx_status.dst, 1672 data->tx_status.data, 1673 data->tx_status.data_len, 1674 data->tx_status.ack); 1675 break; 1676 } 1677 break; 1678 case EVENT_RX_FROM_UNKNOWN: 1679 if (wpa_s->ap_iface == NULL) 1680 break; 1681 ap_rx_from_unknown_sta(wpa_s, data->rx_from_unknown.frame, 1682 data->rx_from_unknown.len); 1683 break; 1684 case EVENT_RX_MGMT: 1685 if (wpa_s->ap_iface == NULL) 1686 break; 1687 ap_mgmt_rx(wpa_s, &data->rx_mgmt); 1688 break; 1689#endif /* CONFIG_AP */ 1690 case EVENT_RX_ACTION: 1691 wpa_printf(MSG_DEBUG, "Received Action frame: SA=" MACSTR 1692 " Category=%u DataLen=%d freq=%d MHz", 1693 MAC2STR(data->rx_action.sa), 1694 data->rx_action.category, (int) data->rx_action.len, 1695 data->rx_action.freq); 1696#ifdef CONFIG_IEEE80211R 1697 if (data->rx_action.category == WLAN_ACTION_FT) { 1698 ft_rx_action(wpa_s, data->rx_action.data, 1699 data->rx_action.len); 1700 break; 1701 } 1702#endif /* CONFIG_IEEE80211R */ 1703 break; 1704#ifdef CONFIG_CLIENT_MLME 1705 case EVENT_MLME_RX: { 1706 struct ieee80211_rx_status rx_status; 1707 os_memset(&rx_status, 0, sizeof(rx_status)); 1708 rx_status.freq = data->mlme_rx.freq; 1709 rx_status.channel = data->mlme_rx.channel; 1710 rx_status.ssi = data->mlme_rx.ssi; 1711 ieee80211_sta_rx(wpa_s, data->mlme_rx.buf, data->mlme_rx.len, 1712 &rx_status); 1713 break; 1714 } 1715#endif /* CONFIG_CLIENT_MLME */ 1716 case EVENT_EAPOL_RX: 1717 wpa_supplicant_rx_eapol(wpa_s, data->eapol_rx.src, 1718 data->eapol_rx.data, 1719 data->eapol_rx.data_len); 1720 break; 1721 case EVENT_SIGNAL_CHANGE: 1722 bgscan_notify_signal_change( 1723 wpa_s, data->signal_change.above_threshold); 1724 break; 1725 default: 1726 wpa_printf(MSG_INFO, "Unknown event %d", event); 1727 break; 1728 } 1729} 1730