1 /* 2 * WPA Supplicant - Driver event processing 3 * Copyright (c) 2003-2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "eapol_supp/eapol_supp_sm.h" 19 #include "wpa.h" 20 #include "eloop.h" 21 #include "drivers/driver.h" 22 #include "config.h" 23 #include "l2_packet/l2_packet.h" 24 #include "wpa_supplicant_i.h" 25 #include "pcsc_funcs.h" 26 #include "preauth.h" 27 #include "pmksa_cache.h" 28 #include "wpa_ctrl.h" 29 #include "eap_peer/eap.h" 30 #include "ctrl_iface_dbus.h" 31 #include "ieee802_11_defs.h" 32 #include "blacklist.h" 33 #include "wpas_glue.h" 34 #include "wps_supplicant.h" 35 36 37 static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s) 38 { 39 struct wpa_ssid *ssid; 40 41 if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid) 42 return 0; 43 44 wpa_printf(MSG_DEBUG, "Select network based on association " 45 "information"); 46 ssid = wpa_supplicant_get_ssid(wpa_s); 47 if (ssid == NULL) { 48 wpa_printf(MSG_INFO, "No network configuration found for the " 49 "current AP"); 50 return -1; 51 } 52 53 if (ssid->disabled) { 54 wpa_printf(MSG_DEBUG, "Selected network is disabled"); 55 return -1; 56 } 57 58 wpa_printf(MSG_DEBUG, "Network configuration found for the current " 59 "AP"); 60 if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X | 61 WPA_KEY_MGMT_WPA_NONE | 62 WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X | 63 WPA_KEY_MGMT_PSK_SHA256 | 64 WPA_KEY_MGMT_IEEE8021X_SHA256)) { 65 u8 wpa_ie[80]; 66 size_t wpa_ie_len = sizeof(wpa_ie); 67 wpa_supplicant_set_suites(wpa_s, NULL, ssid, 68 wpa_ie, &wpa_ie_len); 69 } else { 70 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid); 71 } 72 73 if (wpa_s->current_ssid && wpa_s->current_ssid != ssid) 74 eapol_sm_invalidate_cached_session(wpa_s->eapol); 75 wpa_s->current_ssid = ssid; 76 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid); 77 wpa_supplicant_initiate_eapol(wpa_s); 78 79 return 0; 80 } 81 82 83 static void wpa_supplicant_stop_countermeasures(void *eloop_ctx, 84 void *sock_ctx) 85 { 86 struct wpa_supplicant *wpa_s = eloop_ctx; 87 88 if (wpa_s->countermeasures) { 89 wpa_s->countermeasures = 0; 90 wpa_drv_set_countermeasures(wpa_s, 0); 91 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped"); 92 wpa_supplicant_req_scan(wpa_s, 0, 0); 93 } 94 } 95 96 97 void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s) 98 { 99 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 100 wpa_s->conf->ap_scan = DEFAULT_AP_SCAN; 101 os_memset(wpa_s->bssid, 0, ETH_ALEN); 102 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 103 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 104 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 105 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) 106 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 107 wpa_s->ap_ies_from_associnfo = 0; 108 } 109 110 111 static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s) 112 { 113 struct wpa_ie_data ie; 114 int pmksa_set = -1; 115 size_t i; 116 117 if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 || 118 ie.pmkid == NULL) 119 return; 120 121 for (i = 0; i < ie.num_pmkid; i++) { 122 pmksa_set = pmksa_cache_set_current(wpa_s->wpa, 123 ie.pmkid + i * PMKID_LEN, 124 NULL, NULL, 0); 125 if (pmksa_set == 0) { 126 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1); 127 break; 128 } 129 } 130 131 wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA " 132 "cache", pmksa_set == 0 ? "" : "not "); 133 } 134 135 136 static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s, 137 union wpa_event_data *data) 138 { 139 if (data == NULL) { 140 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event"); 141 return; 142 } 143 wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR 144 " index=%d preauth=%d", 145 MAC2STR(data->pmkid_candidate.bssid), 146 data->pmkid_candidate.index, 147 data->pmkid_candidate.preauth); 148 149 pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid, 150 data->pmkid_candidate.index, 151 data->pmkid_candidate.preauth); 152 } 153 154 155 static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s) 156 { 157 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 158 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) 159 return 0; 160 161 #ifdef IEEE8021X_EAPOL 162 if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA && 163 wpa_s->current_ssid && 164 !(wpa_s->current_ssid->eapol_flags & 165 (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 166 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) { 167 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either 168 * plaintext or static WEP keys). */ 169 return 0; 170 } 171 #endif /* IEEE8021X_EAPOL */ 172 173 return 1; 174 } 175 176 177 /** 178 * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC 179 * @wpa_s: pointer to wpa_supplicant data 180 * @ssid: Configuration data for the network 181 * Returns: 0 on success, -1 on failure 182 * 183 * This function is called when starting authentication with a network that is 184 * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA). 185 */ 186 int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s, 187 struct wpa_ssid *ssid) 188 { 189 #ifdef IEEE8021X_EAPOL 190 int aka = 0, sim = 0, type; 191 192 if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL) 193 return 0; 194 195 if (ssid->eap.eap_methods == NULL) { 196 sim = 1; 197 aka = 1; 198 } else { 199 struct eap_method_type *eap = ssid->eap.eap_methods; 200 while (eap->vendor != EAP_VENDOR_IETF || 201 eap->method != EAP_TYPE_NONE) { 202 if (eap->vendor == EAP_VENDOR_IETF) { 203 if (eap->method == EAP_TYPE_SIM) 204 sim = 1; 205 else if (eap->method == EAP_TYPE_AKA) 206 aka = 1; 207 } 208 eap++; 209 } 210 } 211 212 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL) 213 sim = 0; 214 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL) 215 aka = 0; 216 217 if (!sim && !aka) { 218 wpa_printf(MSG_DEBUG, "Selected network is configured to use " 219 "SIM, but neither EAP-SIM nor EAP-AKA are enabled"); 220 return 0; 221 } 222 223 wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM " 224 "(sim=%d aka=%d) - initialize PCSC", sim, aka); 225 if (sim && aka) 226 type = SCARD_TRY_BOTH; 227 else if (aka) 228 type = SCARD_USIM_ONLY; 229 else 230 type = SCARD_GSM_SIM_ONLY; 231 232 wpa_s->scard = scard_init(type); 233 if (wpa_s->scard == NULL) { 234 wpa_printf(MSG_WARNING, "Failed to initialize SIM " 235 "(pcsc-lite)"); 236 return -1; 237 } 238 wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard); 239 eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard); 240 #endif /* IEEE8021X_EAPOL */ 241 242 return 0; 243 } 244 245 246 #ifndef CONFIG_NO_SCAN_PROCESSING 247 static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss, 248 struct wpa_ssid *ssid) 249 { 250 int i, privacy = 0; 251 252 if (ssid->mixed_cell) 253 return 1; 254 255 #ifdef CONFIG_WPS 256 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) 257 return 1; 258 #endif /* CONFIG_WPS */ 259 260 for (i = 0; i < NUM_WEP_KEYS; i++) { 261 if (ssid->wep_key_len[i]) { 262 privacy = 1; 263 break; 264 } 265 } 266 #ifdef IEEE8021X_EAPOL 267 if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) && 268 ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 269 EAPOL_FLAG_REQUIRE_KEY_BROADCAST)) 270 privacy = 1; 271 #endif /* IEEE8021X_EAPOL */ 272 273 if (bss->caps & IEEE80211_CAP_PRIVACY) 274 return privacy; 275 return !privacy; 276 } 277 278 279 static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s, 280 struct wpa_ssid *ssid, 281 struct wpa_scan_res *bss) 282 { 283 struct wpa_ie_data ie; 284 int proto_match = 0; 285 const u8 *rsn_ie, *wpa_ie; 286 int ret; 287 288 ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss); 289 if (ret >= 0) 290 return ret; 291 292 rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 293 while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) { 294 proto_match++; 295 296 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) { 297 wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed"); 298 break; 299 } 300 if (!(ie.proto & ssid->proto)) { 301 wpa_printf(MSG_DEBUG, " skip RSN IE - proto " 302 "mismatch"); 303 break; 304 } 305 306 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 307 wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher " 308 "mismatch"); 309 break; 310 } 311 312 if (!(ie.group_cipher & ssid->group_cipher)) { 313 wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher " 314 "mismatch"); 315 break; 316 } 317 318 if (!(ie.key_mgmt & ssid->key_mgmt)) { 319 wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt " 320 "mismatch"); 321 break; 322 } 323 324 #ifdef CONFIG_IEEE80211W 325 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) && 326 ssid->ieee80211w == IEEE80211W_REQUIRED) { 327 wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame " 328 "protection"); 329 break; 330 } 331 #endif /* CONFIG_IEEE80211W */ 332 333 wpa_printf(MSG_DEBUG, " selected based on RSN IE"); 334 return 1; 335 } 336 337 wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 338 while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) { 339 proto_match++; 340 341 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) { 342 wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed"); 343 break; 344 } 345 if (!(ie.proto & ssid->proto)) { 346 wpa_printf(MSG_DEBUG, " skip WPA IE - proto " 347 "mismatch"); 348 break; 349 } 350 351 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 352 wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher " 353 "mismatch"); 354 break; 355 } 356 357 if (!(ie.group_cipher & ssid->group_cipher)) { 358 wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher " 359 "mismatch"); 360 break; 361 } 362 363 if (!(ie.key_mgmt & ssid->key_mgmt)) { 364 wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt " 365 "mismatch"); 366 break; 367 } 368 369 wpa_printf(MSG_DEBUG, " selected based on WPA IE"); 370 return 1; 371 } 372 373 if (proto_match == 0) 374 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match"); 375 376 return 0; 377 } 378 379 380 static struct wpa_scan_res * 381 wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s, 382 struct wpa_ssid *group, 383 struct wpa_ssid **selected_ssid) 384 { 385 struct wpa_ssid *ssid; 386 struct wpa_scan_res *bss; 387 size_t i; 388 struct wpa_blacklist *e; 389 const u8 *ie; 390 391 wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP"); 392 for (i = 0; i < wpa_s->scan_res->num; i++) { 393 const u8 *ssid_; 394 u8 wpa_ie_len, rsn_ie_len, ssid_len; 395 bss = wpa_s->scan_res->res[i]; 396 397 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 398 ssid_ = ie ? ie + 2 : (u8 *) ""; 399 ssid_len = ie ? ie[1] : 0; 400 401 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 402 wpa_ie_len = ie ? ie[1] : 0; 403 404 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 405 rsn_ie_len = ie ? ie[1] : 0; 406 407 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 408 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 409 (int) i, MAC2STR(bss->bssid), 410 wpa_ssid_txt(ssid_, ssid_len), 411 wpa_ie_len, rsn_ie_len, bss->caps); 412 413 e = wpa_blacklist_get(wpa_s, bss->bssid); 414 if (e && e->count > 1) { 415 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 416 continue; 417 } 418 419 if (ssid_len == 0) { 420 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 421 continue; 422 } 423 424 if (wpa_ie_len == 0 && rsn_ie_len == 0) { 425 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE"); 426 continue; 427 } 428 429 for (ssid = group; ssid; ssid = ssid->pnext) { 430 int check_ssid = 1; 431 432 if (ssid->disabled) { 433 wpa_printf(MSG_DEBUG, " skip - disabled"); 434 continue; 435 } 436 437 #ifdef CONFIG_WPS 438 if (ssid->ssid_len == 0 && 439 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss)) 440 check_ssid = 0; 441 #endif /* CONFIG_WPS */ 442 443 if (check_ssid && 444 (ssid_len != ssid->ssid_len || 445 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 446 wpa_printf(MSG_DEBUG, " skip - " 447 "SSID mismatch"); 448 continue; 449 } 450 451 if (ssid->bssid_set && 452 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 453 { 454 wpa_printf(MSG_DEBUG, " skip - " 455 "BSSID mismatch"); 456 continue; 457 } 458 459 if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss)) 460 continue; 461 462 wpa_printf(MSG_DEBUG, " selected WPA AP " 463 MACSTR " ssid='%s'", 464 MAC2STR(bss->bssid), 465 wpa_ssid_txt(ssid_, ssid_len)); 466 *selected_ssid = ssid; 467 return bss; 468 } 469 } 470 471 return NULL; 472 } 473 474 475 static struct wpa_scan_res * 476 wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s, 477 struct wpa_ssid *group, 478 struct wpa_ssid **selected_ssid) 479 { 480 struct wpa_ssid *ssid; 481 struct wpa_scan_res *bss; 482 size_t i; 483 struct wpa_blacklist *e; 484 const u8 *ie; 485 486 wpa_printf(MSG_DEBUG, "Try to find non-WPA AP"); 487 for (i = 0; i < wpa_s->scan_res->num; i++) { 488 const u8 *ssid_; 489 u8 wpa_ie_len, rsn_ie_len, ssid_len; 490 bss = wpa_s->scan_res->res[i]; 491 492 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 493 ssid_ = ie ? ie + 2 : (u8 *) ""; 494 ssid_len = ie ? ie[1] : 0; 495 496 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 497 wpa_ie_len = ie ? ie[1] : 0; 498 499 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 500 rsn_ie_len = ie ? ie[1] : 0; 501 502 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 503 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 504 (int) i, MAC2STR(bss->bssid), 505 wpa_ssid_txt(ssid_, ssid_len), 506 wpa_ie_len, rsn_ie_len, bss->caps); 507 508 e = wpa_blacklist_get(wpa_s, bss->bssid); 509 if (e && e->count > 1) { 510 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 511 continue; 512 } 513 514 if (ssid_len == 0) { 515 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 516 continue; 517 } 518 519 for (ssid = group; ssid; ssid = ssid->pnext) { 520 int check_ssid = ssid->ssid_len != 0; 521 522 if (ssid->disabled) { 523 wpa_printf(MSG_DEBUG, " skip - disabled"); 524 continue; 525 } 526 527 #ifdef CONFIG_WPS 528 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) { 529 /* Only allow wildcard SSID match if an AP 530 * advertises active WPS operation that matches 531 * with our mode. */ 532 check_ssid = 1; 533 if (ssid->ssid_len == 0 && 534 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, 535 bss)) 536 check_ssid = 0; 537 } 538 #endif /* CONFIG_WPS */ 539 540 if (check_ssid && 541 (ssid_len != ssid->ssid_len || 542 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 543 wpa_printf(MSG_DEBUG, " skip - " 544 "SSID mismatch"); 545 continue; 546 } 547 548 if (ssid->bssid_set && 549 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 550 { 551 wpa_printf(MSG_DEBUG, " skip - " 552 "BSSID mismatch"); 553 continue; 554 } 555 556 /* Fix 5.1.7 WPS test case */ 557 if (wpas_wps_ssid_bss_match(wpa_s, ssid, bss) == 0) { 558 continue; 559 } 560 561 if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) && 562 !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) && 563 !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA)) 564 { 565 wpa_printf(MSG_DEBUG, " skip - " 566 "non-WPA network not allowed"); 567 continue; 568 } 569 570 if ((ssid->key_mgmt & 571 (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK | 572 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK | 573 WPA_KEY_MGMT_IEEE8021X_SHA256 | 574 WPA_KEY_MGMT_PSK_SHA256)) && 575 (wpa_ie_len != 0 || rsn_ie_len != 0)) { 576 wpa_printf(MSG_DEBUG, " skip - " 577 "WPA network"); 578 continue; 579 } 580 581 if (!wpa_supplicant_match_privacy(bss, ssid)) { 582 wpa_printf(MSG_DEBUG, " skip - " 583 "privacy mismatch"); 584 continue; 585 } 586 587 if (bss->caps & IEEE80211_CAP_IBSS) { 588 wpa_printf(MSG_DEBUG, " skip - " 589 "IBSS (adhoc) network"); 590 continue; 591 } 592 593 wpa_printf(MSG_DEBUG, " selected non-WPA AP " 594 MACSTR " ssid='%s'", 595 MAC2STR(bss->bssid), 596 wpa_ssid_txt(ssid_, ssid_len)); 597 *selected_ssid = ssid; 598 return bss; 599 } 600 } 601 602 return NULL; 603 } 604 605 606 static struct wpa_scan_res * 607 wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group, 608 struct wpa_ssid **selected_ssid) 609 { 610 struct wpa_scan_res *selected; 611 612 wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d", 613 group->priority); 614 615 /* First, try to find WPA-enabled AP */ 616 selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid); 617 if (selected) 618 return selected; 619 620 /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration 621 * allows this. */ 622 return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid); 623 } 624 625 626 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s) 627 { 628 int prio, timeout; 629 struct wpa_scan_res *selected = NULL; 630 struct wpa_ssid *ssid = NULL; 631 632 wpa_supplicant_notify_scanning(wpa_s, 0); 633 if (wpa_supplicant_get_scan_results(wpa_s) < 0) { 634 if (wpa_s->conf->ap_scan == 2) 635 return; 636 wpa_printf(MSG_DEBUG, "Failed to get scan results - try " 637 "scanning again"); 638 timeout = 1; 639 goto req_scan; 640 } 641 642 /* 643 * Don't post the results if this was the initial cached 644 * and there were no results. 645 */ 646 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 && 647 wpa_s->scan_res->num == 0) { 648 wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are " 649 "empty - not posting"); 650 } else { 651 wpa_printf(MSG_DEBUG, "New scan results available"); 652 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); 653 wpa_supplicant_dbus_notify_scan_results(wpa_s); 654 /* WPS availability is fetched from scan results. Reduce logging. */ 655 #ifndef ANDROID 656 wpas_wps_notify_scan_results(wpa_s); 657 #endif 658 } 659 660 if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) 661 return; 662 663 if (wpa_s->disconnected) { 664 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 665 return; 666 } 667 668 while (selected == NULL) { 669 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) { 670 selected = wpa_supplicant_select_bss( 671 wpa_s, wpa_s->conf->pssid[prio], &ssid); 672 if (selected) 673 break; 674 } 675 676 if (selected == NULL && wpa_s->blacklist) { 677 wpa_printf(MSG_DEBUG, "No APs found - clear blacklist " 678 "and try again"); 679 wpa_blacklist_clear(wpa_s); 680 wpa_s->blacklist_cleared++; 681 } else if (selected == NULL) { 682 break; 683 } 684 } 685 686 if (selected) { 687 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) { 688 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP 689 "PBC session overlap"); 690 timeout = 10; 691 goto req_scan; 692 } 693 694 /* Do not trigger new association unless the BSSID has changed 695 * or if reassociation is requested. If we are in process of 696 * associating with the selected BSSID, do not trigger new 697 * attempt. */ 698 if (wpa_s->reassociate || 699 (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 && 700 (wpa_s->wpa_state != WPA_ASSOCIATING || 701 os_memcmp(selected->bssid, wpa_s->pending_bssid, 702 ETH_ALEN) != 0))) { 703 if (wpa_supplicant_scard_init(wpa_s, ssid)) { 704 wpa_supplicant_req_scan(wpa_s, 10, 0); 705 return; 706 } 707 wpa_supplicant_associate(wpa_s, selected, ssid); 708 } else { 709 wpa_printf(MSG_DEBUG, "Already associated with the " 710 "selected AP."); 711 } 712 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res); 713 } else { 714 wpa_printf(MSG_DEBUG, "No suitable AP found."); 715 #ifdef ANDROID 716 timeout = wpa_s->scan_interval; 717 if (wpas_wps_searching(wpa_s)) { 718 timeout = 5; 719 } 720 #else 721 timeout = 5; 722 #endif 723 goto req_scan; 724 } 725 726 return; 727 728 req_scan: 729 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) { 730 /* 731 * Quick recovery if the initial scan results were not 732 * complete when fetched before the first scan request. 733 */ 734 wpa_s->scan_res_tried++; 735 timeout = 0; 736 } else if (!wpa_supplicant_enabled_networks(wpa_s->conf)) { 737 /* 738 * No networks are enabled; short-circuit request so 739 * we don't wait timeout seconds before transitioning 740 * to INACTIVE state. 741 */ 742 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); 743 return; 744 } 745 wpa_supplicant_req_scan(wpa_s, timeout, 0); 746 } 747 #endif /* CONFIG_NO_SCAN_PROCESSING */ 748 749 750 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s, 751 union wpa_event_data *data) 752 { 753 int l, len, found = 0, wpa_found, rsn_found; 754 u8 *p; 755 756 wpa_printf(MSG_DEBUG, "Association info event"); 757 if (data->assoc_info.req_ies) 758 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies, 759 data->assoc_info.req_ies_len); 760 if (data->assoc_info.resp_ies) 761 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies, 762 data->assoc_info.resp_ies_len); 763 if (data->assoc_info.beacon_ies) 764 wpa_hexdump(MSG_DEBUG, "beacon_ies", 765 data->assoc_info.beacon_ies, 766 data->assoc_info.beacon_ies_len); 767 768 p = data->assoc_info.req_ies; 769 l = data->assoc_info.req_ies_len; 770 771 /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */ 772 while (p && l >= 2) { 773 len = p[1] + 2; 774 if (len > l) { 775 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info", 776 p, l); 777 break; 778 } 779 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 780 (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) || 781 (p[0] == WLAN_EID_RSN && p[1] >= 2)) { 782 if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len)) 783 break; 784 found = 1; 785 wpa_find_assoc_pmkid(wpa_s); 786 break; 787 } 788 l -= len; 789 p += len; 790 } 791 if (!found && data->assoc_info.req_ies) 792 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0); 793 794 /* WPA/RSN IE from Beacon/ProbeResp */ 795 p = data->assoc_info.beacon_ies; 796 l = data->assoc_info.beacon_ies_len; 797 798 /* Go through the IEs and make a copy of the WPA/RSN IEs, if present. 799 */ 800 wpa_found = rsn_found = 0; 801 while (p && l >= 2) { 802 len = p[1] + 2; 803 if (len > l) { 804 wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies", 805 p, l); 806 break; 807 } 808 if (!wpa_found && 809 p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 810 os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) { 811 wpa_found = 1; 812 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len); 813 } 814 815 if (!rsn_found && 816 p[0] == WLAN_EID_RSN && p[1] >= 2) { 817 rsn_found = 1; 818 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len); 819 } 820 821 l -= len; 822 p += len; 823 } 824 825 if (!wpa_found) 826 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0); 827 if (!rsn_found) 828 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0); 829 if (wpa_found || rsn_found) 830 wpa_s->ap_ies_from_associnfo = 1; 831 } 832 833 834 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s, 835 union wpa_event_data *data) 836 { 837 u8 bssid[ETH_ALEN]; 838 int ft_completed = wpa_ft_is_completed(wpa_s->wpa); 839 840 if (data) 841 wpa_supplicant_event_associnfo(wpa_s, data); 842 843 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED); 844 if (wpa_s->use_client_mlme) 845 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN); 846 if (wpa_s->use_client_mlme || 847 (wpa_drv_get_bssid(wpa_s, bssid) >= 0 && 848 os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) { 849 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID=" 850 MACSTR, MAC2STR(bssid)); 851 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN); 852 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 853 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) { 854 wpa_clear_keys(wpa_s, bssid); 855 } 856 if (wpa_supplicant_select_config(wpa_s) < 0) { 857 wpa_supplicant_disassociate( 858 wpa_s, WLAN_REASON_DEAUTH_LEAVING); 859 return; 860 } 861 } 862 863 wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid)); 864 if (wpa_s->current_ssid) { 865 /* When using scanning (ap_scan=1), SIM PC/SC interface can be 866 * initialized before association, but for other modes, 867 * initialize PC/SC here, if the current configuration needs 868 * smartcard or SIM/USIM. */ 869 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid); 870 } 871 wpa_sm_notify_assoc(wpa_s->wpa, bssid); 872 l2_packet_notify_auth_start(wpa_s->l2); 873 874 /* 875 * Set portEnabled first to FALSE in order to get EAP state machine out 876 * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE 877 * state machine may transit to AUTHENTICATING state based on obsolete 878 * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to 879 * AUTHENTICATED without ever giving chance to EAP state machine to 880 * reset the state. 881 */ 882 if (!ft_completed) { 883 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 884 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 885 } 886 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed) 887 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 888 /* 802.1X::portControl = Auto */ 889 eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE); 890 wpa_s->eapol_received = 0; 891 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 892 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 893 wpa_supplicant_cancel_auth_timeout(wpa_s); 894 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 895 } else if (!ft_completed) { 896 /* Timeout for receiving the first EAPOL packet */ 897 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0); 898 } 899 wpa_supplicant_cancel_scan(wpa_s); 900 901 if (wpa_s->driver_4way_handshake && 902 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 903 /* 904 * We are done; the driver will take care of RSN 4-way 905 * handshake. 906 */ 907 wpa_supplicant_cancel_auth_timeout(wpa_s); 908 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 909 eapol_sm_notify_portValid(wpa_s->eapol, TRUE); 910 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE); 911 } 912 913 if (wpa_s->pending_eapol_rx) { 914 struct os_time now, age; 915 os_get_time(&now); 916 os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age); 917 if (age.sec == 0 && age.usec < 100000 && 918 os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) == 919 0) { 920 wpa_printf(MSG_DEBUG, "Process pending EAPOL frame " 921 "that was received just before association " 922 "notification"); 923 wpa_supplicant_rx_eapol( 924 wpa_s, wpa_s->pending_eapol_rx_src, 925 wpabuf_head(wpa_s->pending_eapol_rx), 926 wpabuf_len(wpa_s->pending_eapol_rx)); 927 } 928 wpabuf_free(wpa_s->pending_eapol_rx); 929 wpa_s->pending_eapol_rx = NULL; 930 } 931 } 932 933 934 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s) 935 { 936 const u8 *bssid; 937 938 if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 939 /* 940 * At least Host AP driver and a Prism3 card seemed to be 941 * generating streams of disconnected events when configuring 942 * IBSS for WPA-None. Ignore them for now. 943 */ 944 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in " 945 "IBSS/WPA-None mode"); 946 return; 947 } 948 949 if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE && 950 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 951 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - " 952 "pre-shared key may be incorrect"); 953 } 954 if (wpa_s->wpa_state >= WPA_ASSOCIATED) 955 wpa_supplicant_req_scan(wpa_s, 0, 500000); 956 bssid = wpa_s->bssid; 957 if (is_zero_ether_addr(bssid)) 958 bssid = wpa_s->pending_bssid; 959 wpa_blacklist_add(wpa_s, bssid); 960 wpa_sm_notify_disassoc(wpa_s->wpa); 961 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - " 962 "remove keys"); 963 if (wpa_supplicant_dynamic_keys(wpa_s)) { 964 wpa_s->keys_cleared = 0; 965 wpa_clear_keys(wpa_s, wpa_s->bssid); 966 } 967 wpa_supplicant_mark_disassoc(wpa_s); 968 } 969 970 971 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 972 static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx, 973 void *sock_ctx) 974 { 975 struct wpa_supplicant *wpa_s = eloop_ctx; 976 977 if (!wpa_s->pending_mic_error_report) 978 return; 979 980 wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report"); 981 wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise); 982 wpa_s->pending_mic_error_report = 0; 983 } 984 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 985 986 987 static void 988 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s, 989 union wpa_event_data *data) 990 { 991 int pairwise; 992 struct os_time t; 993 994 wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected"); 995 pairwise = (data && data->michael_mic_failure.unicast); 996 os_get_time(&t); 997 if ((wpa_s->last_michael_mic_error && 998 t.sec - wpa_s->last_michael_mic_error <= 60) || 999 wpa_s->pending_mic_error_report) { 1000 if (wpa_s->pending_mic_error_report) { 1001 /* 1002 * Send the pending MIC error report immediately since 1003 * we are going to start countermeasures and AP better 1004 * do the same. 1005 */ 1006 wpa_sm_key_request(wpa_s->wpa, 1, 1007 wpa_s->pending_mic_error_pairwise); 1008 } 1009 1010 /* Send the new MIC error report immediately since we are going 1011 * to start countermeasures and AP better do the same. 1012 */ 1013 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1014 1015 /* initialize countermeasures */ 1016 wpa_s->countermeasures = 1; 1017 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started"); 1018 1019 /* 1020 * Need to wait for completion of request frame. We do not get 1021 * any callback for the message completion, so just wait a 1022 * short while and hope for the best. */ 1023 os_sleep(0, 10000); 1024 1025 wpa_drv_set_countermeasures(wpa_s, 1); 1026 wpa_supplicant_deauthenticate(wpa_s, 1027 WLAN_REASON_MICHAEL_MIC_FAILURE); 1028 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures, 1029 wpa_s, NULL); 1030 eloop_register_timeout(60, 0, 1031 wpa_supplicant_stop_countermeasures, 1032 wpa_s, NULL); 1033 /* TODO: mark the AP rejected for 60 second. STA is 1034 * allowed to associate with another AP.. */ 1035 } else { 1036 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 1037 if (wpa_s->mic_errors_seen) { 1038 /* 1039 * Reduce the effectiveness of Michael MIC error 1040 * reports as a means for attacking against TKIP if 1041 * more than one MIC failure is noticed with the same 1042 * PTK. We delay the transmission of the reports by a 1043 * random time between 0 and 60 seconds in order to 1044 * force the attacker wait 60 seconds before getting 1045 * the information on whether a frame resulted in a MIC 1046 * failure. 1047 */ 1048 u8 rval[4]; 1049 int sec; 1050 1051 if (os_get_random(rval, sizeof(rval)) < 0) 1052 sec = os_random() % 60; 1053 else 1054 sec = WPA_GET_BE32(rval) % 60; 1055 wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d " 1056 "seconds", sec); 1057 wpa_s->pending_mic_error_report = 1; 1058 wpa_s->pending_mic_error_pairwise = pairwise; 1059 eloop_cancel_timeout( 1060 wpa_supplicant_delayed_mic_error_report, 1061 wpa_s, NULL); 1062 eloop_register_timeout( 1063 sec, os_random() % 1000000, 1064 wpa_supplicant_delayed_mic_error_report, 1065 wpa_s, NULL); 1066 } else { 1067 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1068 } 1069 #else /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1070 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1071 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1072 } 1073 wpa_s->last_michael_mic_error = t.sec; 1074 wpa_s->mic_errors_seen++; 1075 } 1076 1077 1078 static void 1079 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s, 1080 union wpa_event_data *data) 1081 { 1082 if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0) 1083 return; 1084 1085 switch (data->interface_status.ievent) { 1086 case EVENT_INTERFACE_ADDED: 1087 if (!wpa_s->interface_removed) 1088 break; 1089 wpa_s->interface_removed = 0; 1090 wpa_printf(MSG_DEBUG, "Configured interface was added."); 1091 if (wpa_supplicant_driver_init(wpa_s) < 0) { 1092 wpa_printf(MSG_INFO, "Failed to initialize the driver " 1093 "after interface was added."); 1094 } 1095 break; 1096 case EVENT_INTERFACE_REMOVED: 1097 wpa_printf(MSG_DEBUG, "Configured interface was removed."); 1098 wpa_s->interface_removed = 1; 1099 wpa_supplicant_mark_disassoc(wpa_s); 1100 l2_packet_deinit(wpa_s->l2); 1101 wpa_s->l2 = NULL; 1102 break; 1103 } 1104 } 1105 1106 1107 #ifdef CONFIG_PEERKEY 1108 static void 1109 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s, 1110 union wpa_event_data *data) 1111 { 1112 if (data == NULL) 1113 return; 1114 wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer); 1115 } 1116 #endif /* CONFIG_PEERKEY */ 1117 1118 1119 #ifdef CONFIG_IEEE80211R 1120 static void 1121 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s, 1122 union wpa_event_data *data) 1123 { 1124 if (data == NULL) 1125 return; 1126 1127 if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies, 1128 data->ft_ies.ies_len, 1129 data->ft_ies.ft_action, 1130 data->ft_ies.target_ap) < 0) { 1131 /* TODO: prevent MLME/driver from trying to associate? */ 1132 } 1133 } 1134 #endif /* CONFIG_IEEE80211R */ 1135 1136 1137 void wpa_supplicant_event(void *ctx, wpa_event_type event, 1138 union wpa_event_data *data) 1139 { 1140 struct wpa_supplicant *wpa_s = ctx; 1141 1142 switch (event) { 1143 case EVENT_ASSOC: 1144 wpa_supplicant_event_assoc(wpa_s, data); 1145 break; 1146 case EVENT_DISASSOC: 1147 wpa_supplicant_event_disassoc(wpa_s); 1148 break; 1149 case EVENT_MICHAEL_MIC_FAILURE: 1150 wpa_supplicant_event_michael_mic_failure(wpa_s, data); 1151 break; 1152 #ifndef CONFIG_NO_SCAN_PROCESSING 1153 case EVENT_SCAN_RESULTS: 1154 wpa_supplicant_event_scan_results(wpa_s); 1155 break; 1156 #endif /* CONFIG_NO_SCAN_PROCESSING */ 1157 case EVENT_ASSOCINFO: 1158 wpa_supplicant_event_associnfo(wpa_s, data); 1159 break; 1160 case EVENT_INTERFACE_STATUS: 1161 wpa_supplicant_event_interface_status(wpa_s, data); 1162 break; 1163 case EVENT_PMKID_CANDIDATE: 1164 wpa_supplicant_event_pmkid_candidate(wpa_s, data); 1165 break; 1166 #ifdef CONFIG_PEERKEY 1167 case EVENT_STKSTART: 1168 wpa_supplicant_event_stkstart(wpa_s, data); 1169 break; 1170 #endif /* CONFIG_PEERKEY */ 1171 #ifdef CONFIG_IEEE80211R 1172 case EVENT_FT_RESPONSE: 1173 wpa_supplicant_event_ft_response(wpa_s, data); 1174 break; 1175 #endif /* CONFIG_IEEE80211R */ 1176 default: 1177 wpa_printf(MSG_INFO, "Unknown event %d", event); 1178 break; 1179 } 1180 } 1181
