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