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kernel - TMPFS - Stabilization pass, fix rename, symlink issues
[dragonfly.git] / contrib / wpa_supplicant / wpa_supplicant / events.c
blob63002a4725312cf893cb90c72976fc9c308e7299
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
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 os_memset(wpa_s->bssid, 0, ETH_ALEN);
101 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
102 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
103 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
104 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt))
105 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
106 wpa_s->ap_ies_from_associnfo = 0;
107 }
108
109
110 static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
111 {
112 struct wpa_ie_data ie;
113 int pmksa_set = -1;
114 size_t i;
115
116 if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
117 ie.pmkid == NULL)
118 return;
119
120 for (i = 0; i < ie.num_pmkid; i++) {
121 pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
122 ie.pmkid + i * PMKID_LEN,
123 NULL, NULL, 0);
124 if (pmksa_set == 0) {
125 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
126 break;
127 }
128 }
129
130 wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
131 "cache", pmksa_set == 0 ? "" : "not ");
132 }
133
134
135 static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
136 union wpa_event_data *data)
137 {
138 if (data == NULL) {
139 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
140 return;
141 }
142 wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
143 " index=%d preauth=%d",
144 MAC2STR(data->pmkid_candidate.bssid),
145 data->pmkid_candidate.index,
146 data->pmkid_candidate.preauth);
147
148 pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
149 data->pmkid_candidate.index,
150 data->pmkid_candidate.preauth);
151 }
152
153
154 static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
155 {
156 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
157 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
158 return 0;
159
160 #ifdef IEEE8021X_EAPOL
161 if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
162 wpa_s->current_ssid &&
163 !(wpa_s->current_ssid->eapol_flags &
164 (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
165 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
166 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
167 * plaintext or static WEP keys). */
168 return 0;
169 }
170 #endif /* IEEE8021X_EAPOL */
171
172 return 1;
173 }
174
175
176 /**
177 * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
178 * @wpa_s: pointer to wpa_supplicant data
179 * @ssid: Configuration data for the network
180 * Returns: 0 on success, -1 on failure
181 *
182 * This function is called when starting authentication with a network that is
183 * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
184 */
185 int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
186 struct wpa_ssid *ssid)
187 {
188 #ifdef IEEE8021X_EAPOL
189 int aka = 0, sim = 0, type;
190
191 if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL)
192 return 0;
193
194 if (ssid->eap.eap_methods == NULL) {
195 sim = 1;
196 aka = 1;
197 } else {
198 struct eap_method_type *eap = ssid->eap.eap_methods;
199 while (eap->vendor != EAP_VENDOR_IETF ||
200 eap->method != EAP_TYPE_NONE) {
201 if (eap->vendor == EAP_VENDOR_IETF) {
202 if (eap->method == EAP_TYPE_SIM)
203 sim = 1;
204 else if (eap->method == EAP_TYPE_AKA)
205 aka = 1;
206 }
207 eap++;
208 }
209 }
210
211 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
212 sim = 0;
213 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
214 aka = 0;
215
216 if (!sim && !aka) {
217 wpa_printf(MSG_DEBUG, "Selected network is configured to use "
218 "SIM, but neither EAP-SIM nor EAP-AKA are enabled");
219 return 0;
220 }
221
222 wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
223 "(sim=%d aka=%d) - initialize PCSC", sim, aka);
224 if (sim && aka)
225 type = SCARD_TRY_BOTH;
226 else if (aka)
227 type = SCARD_USIM_ONLY;
228 else
229 type = SCARD_GSM_SIM_ONLY;
230
231 wpa_s->scard = scard_init(type);
232 if (wpa_s->scard == NULL) {
233 wpa_printf(MSG_WARNING, "Failed to initialize SIM "
234 "(pcsc-lite)");
235 return -1;
236 }
237 wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
238 eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
239 #endif /* IEEE8021X_EAPOL */
240
241 return 0;
242 }
243
244
245 #ifndef CONFIG_NO_SCAN_PROCESSING
246 static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss,
247 struct wpa_ssid *ssid)
248 {
249 int i, privacy = 0;
250
251 if (ssid->mixed_cell)
252 return 1;
253
254 #ifdef CONFIG_WPS
255 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS)
256 return 1;
257 #endif /* CONFIG_WPS */
258
259 for (i = 0; i < NUM_WEP_KEYS; i++) {
260 if (ssid->wep_key_len[i]) {
261 privacy = 1;
262 break;
263 }
264 }
265 #ifdef IEEE8021X_EAPOL
266 if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
267 ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
268 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
269 privacy = 1;
270 #endif /* IEEE8021X_EAPOL */
271
272 if (bss->caps & IEEE80211_CAP_PRIVACY)
273 return privacy;
274 return !privacy;
275 }
276
277
278 static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s,
279 struct wpa_ssid *ssid,
280 struct wpa_scan_res *bss)
281 {
282 struct wpa_ie_data ie;
283 int proto_match = 0;
284 const u8 *rsn_ie, *wpa_ie;
285 int ret;
286
287 ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss);
288 if (ret >= 0)
289 return ret;
290
291 rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
292 while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) {
293 proto_match++;
294
295 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) {
296 wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed");
297 break;
298 }
299 if (!(ie.proto & ssid->proto)) {
300 wpa_printf(MSG_DEBUG, " skip RSN IE - proto "
301 "mismatch");
302 break;
303 }
304
305 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
306 wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher "
307 "mismatch");
308 break;
309 }
310
311 if (!(ie.group_cipher & ssid->group_cipher)) {
312 wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher "
313 "mismatch");
314 break;
315 }
316
317 if (!(ie.key_mgmt & ssid->key_mgmt)) {
318 wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt "
319 "mismatch");
320 break;
321 }
322
323 #ifdef CONFIG_IEEE80211W
324 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) &&
325 ssid->ieee80211w == IEEE80211W_REQUIRED) {
326 wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame "
327 "protection");
328 break;
329 }
330 #endif /* CONFIG_IEEE80211W */
331
332 wpa_printf(MSG_DEBUG, " selected based on RSN IE");
333 return 1;
334 }
335
336 wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
337 while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) {
338 proto_match++;
339
340 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) {
341 wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed");
342 break;
343 }
344 if (!(ie.proto & ssid->proto)) {
345 wpa_printf(MSG_DEBUG, " skip WPA IE - proto "
346 "mismatch");
347 break;
348 }
349
350 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
351 wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher "
352 "mismatch");
353 break;
354 }
355
356 if (!(ie.group_cipher & ssid->group_cipher)) {
357 wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher "
358 "mismatch");
359 break;
360 }
361
362 if (!(ie.key_mgmt & ssid->key_mgmt)) {
363 wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt "
364 "mismatch");
365 break;
366 }
367
368 wpa_printf(MSG_DEBUG, " selected based on WPA IE");
369 return 1;
370 }
371
372 if (proto_match == 0)
373 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match");
374
375 return 0;
376 }
377
378
379 static struct wpa_scan_res *
380 wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
381 struct wpa_ssid *group,
382 struct wpa_ssid **selected_ssid)
383 {
384 struct wpa_ssid *ssid;
385 struct wpa_scan_res *bss;
386 size_t i;
387 struct wpa_blacklist *e;
388 const u8 *ie;
389
390 wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
391 for (i = 0; i < wpa_s->scan_res->num; i++) {
392 const u8 *ssid_;
393 u8 wpa_ie_len, rsn_ie_len, ssid_len;
394 bss = wpa_s->scan_res->res[i];
395
396 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
397 ssid_ = ie ? ie + 2 : (u8 *) "";
398 ssid_len = ie ? ie[1] : 0;
399
400 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
401 wpa_ie_len = ie ? ie[1] : 0;
402
403 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
404 rsn_ie_len = ie ? ie[1] : 0;
405
406 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
407 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
408 (int) i, MAC2STR(bss->bssid),
409 wpa_ssid_txt(ssid_, ssid_len),
410 wpa_ie_len, rsn_ie_len, bss->caps);
411
412 e = wpa_blacklist_get(wpa_s, bss->bssid);
413 if (e && e->count > 1) {
414 wpa_printf(MSG_DEBUG, " skip - blacklisted");
415 continue;
416 }
417
418 if (ssid_len == 0) {
419 wpa_printf(MSG_DEBUG, " skip - SSID not known");
420 continue;
421 }
422
423 if (wpa_ie_len == 0 && rsn_ie_len == 0) {
424 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE");
425 continue;
426 }
427
428 for (ssid = group; ssid; ssid = ssid->pnext) {
429 int check_ssid = 1;
430
431 if (ssid->disabled) {
432 wpa_printf(MSG_DEBUG, " skip - disabled");
433 continue;
434 }
435
436 #ifdef CONFIG_WPS
437 if (ssid->ssid_len == 0 &&
438 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss))
439 check_ssid = 0;
440 #endif /* CONFIG_WPS */
441
442 if (check_ssid &&
443 (ssid_len != ssid->ssid_len ||
444 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
445 wpa_printf(MSG_DEBUG, " skip - "
446 "SSID mismatch");
447 continue;
448 }
449
450 if (ssid->bssid_set &&
451 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
452 {
453 wpa_printf(MSG_DEBUG, " skip - "
454 "BSSID mismatch");
455 continue;
456 }
457
458 if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss))
459 continue;
460
461 wpa_printf(MSG_DEBUG, " selected WPA AP "
462 MACSTR " ssid='%s'",
463 MAC2STR(bss->bssid),
464 wpa_ssid_txt(ssid_, ssid_len));
465 *selected_ssid = ssid;
466 return bss;
467 }
468 }
469
470 return NULL;
471 }
472
473
474 static struct wpa_scan_res *
475 wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
476 struct wpa_ssid *group,
477 struct wpa_ssid **selected_ssid)
478 {
479 struct wpa_ssid *ssid;
480 struct wpa_scan_res *bss;
481 size_t i;
482 struct wpa_blacklist *e;
483 const u8 *ie;
484
485 wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
486 for (i = 0; i < wpa_s->scan_res->num; i++) {
487 const u8 *ssid_;
488 u8 wpa_ie_len, rsn_ie_len, ssid_len;
489 bss = wpa_s->scan_res->res[i];
490
491 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
492 ssid_ = ie ? ie + 2 : (u8 *) "";
493 ssid_len = ie ? ie[1] : 0;
494
495 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
496 wpa_ie_len = ie ? ie[1] : 0;
497
498 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
499 rsn_ie_len = ie ? ie[1] : 0;
500
501 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
502 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
503 (int) i, MAC2STR(bss->bssid),
504 wpa_ssid_txt(ssid_, ssid_len),
505 wpa_ie_len, rsn_ie_len, bss->caps);
506
507 e = wpa_blacklist_get(wpa_s, bss->bssid);
508 if (e && e->count > 1) {
509 wpa_printf(MSG_DEBUG, " skip - blacklisted");
510 continue;
511 }
512
513 if (ssid_len == 0) {
514 wpa_printf(MSG_DEBUG, " skip - SSID not known");
515 continue;
516 }
517
518 for (ssid = group; ssid; ssid = ssid->pnext) {
519 int check_ssid = ssid->ssid_len != 0;
520
521 if (ssid->disabled) {
522 wpa_printf(MSG_DEBUG, " skip - disabled");
523 continue;
524 }
525
526 #ifdef CONFIG_WPS
527 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
528 /* Only allow wildcard SSID match if an AP
529 * advertises active WPS operation that matches
530 * with our mode. */
531 check_ssid = 1;
532 if (ssid->ssid_len == 0 &&
533 wpas_wps_ssid_wildcard_ok(wpa_s, ssid,
534 bss))
535 check_ssid = 0;
536 }
537 #endif /* CONFIG_WPS */
538
539 if (check_ssid &&
540 (ssid_len != ssid->ssid_len ||
541 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
542 wpa_printf(MSG_DEBUG, " skip - "
543 "SSID mismatch");
544 continue;
545 }
546
547 if (ssid->bssid_set &&
548 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
549 {
550 wpa_printf(MSG_DEBUG, " skip - "
551 "BSSID mismatch");
552 continue;
553 }
554
555 if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
556 !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) &&
557 !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
558 {
559 wpa_printf(MSG_DEBUG, " skip - "
560 "non-WPA network not allowed");
561 continue;
562 }
563
564 if ((ssid->key_mgmt &
565 (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
566 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
567 WPA_KEY_MGMT_IEEE8021X_SHA256 |
568 WPA_KEY_MGMT_PSK_SHA256)) &&
569 (wpa_ie_len != 0 || rsn_ie_len != 0)) {
570 wpa_printf(MSG_DEBUG, " skip - "
571 "WPA network");
572 continue;
573 }
574
575 if (!wpa_supplicant_match_privacy(bss, ssid)) {
576 wpa_printf(MSG_DEBUG, " skip - "
577 "privacy mismatch");
578 continue;
579 }
580
581 if (bss->caps & IEEE80211_CAP_IBSS) {
582 wpa_printf(MSG_DEBUG, " skip - "
583 "IBSS (adhoc) network");
584 continue;
585 }
586
587 wpa_printf(MSG_DEBUG, " selected non-WPA AP "
588 MACSTR " ssid='%s'",
589 MAC2STR(bss->bssid),
590 wpa_ssid_txt(ssid_, ssid_len));
591 *selected_ssid = ssid;
592 return bss;
593 }
594 }
595
596 return NULL;
597 }
598
599
600 static struct wpa_scan_res *
601 wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
602 struct wpa_ssid **selected_ssid)
603 {
604 struct wpa_scan_res *selected;
605
606 wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
607 group->priority);
608
609 /* First, try to find WPA-enabled AP */
610 selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid);
611 if (selected)
612 return selected;
613
614 /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
615 * allows this. */
616 return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid);
617 }
618
619
620 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
621 {
622 int prio, timeout;
623 struct wpa_scan_res *selected = NULL;
624 struct wpa_ssid *ssid = NULL;
625
626 wpa_supplicant_notify_scanning(wpa_s, 0);
627
628 if (wpa_supplicant_get_scan_results(wpa_s) < 0) {
629 if (wpa_s->conf->ap_scan == 2)
630 return;
631 wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
632 "scanning again");
633 timeout = 1;
634 goto req_scan;
635 }
636
637 /*
638 * Don't post the results if this was the initial cached
639 * and there were no results.
640 */
641 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
642 wpa_s->scan_res->num == 0) {
643 wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
644 "empty - not posting");
645 } else {
646 wpa_printf(MSG_DEBUG, "New scan results available");
647 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
648 wpa_supplicant_dbus_notify_scan_results(wpa_s);
649 wpas_wps_notify_scan_results(wpa_s);
650 }
651
652 if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s)))
653 return;
654
655 if (wpa_s->disconnected) {
656 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
657 return;
658 }
659
660 while (selected == NULL) {
661 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
662 selected = wpa_supplicant_select_bss(
663 wpa_s, wpa_s->conf->pssid[prio], &ssid);
664 if (selected)
665 break;
666 }
667
668 if (selected == NULL && wpa_s->blacklist) {
669 wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
670 "and try again");
671 wpa_blacklist_clear(wpa_s);
672 wpa_s->blacklist_cleared++;
673 } else if (selected == NULL) {
674 break;
675 }
676 }
677
678 if (selected) {
679 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) {
680 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP
681 "PBC session overlap");
682 timeout = 10;
683 goto req_scan;
684 }
685
686 /* Do not trigger new association unless the BSSID has changed
687 * or if reassociation is requested. If we are in process of
688 * associating with the selected BSSID, do not trigger new
689 * attempt. */
690 if (wpa_s->reassociate ||
691 (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
692 (wpa_s->wpa_state != WPA_ASSOCIATING ||
693 os_memcmp(selected->bssid, wpa_s->pending_bssid,
694 ETH_ALEN) != 0))) {
695 if (wpa_supplicant_scard_init(wpa_s, ssid)) {
696 wpa_supplicant_req_scan(wpa_s, 10, 0);
697 return;
698 }
699 wpa_supplicant_associate(wpa_s, selected, ssid);
700 } else {
701 wpa_printf(MSG_DEBUG, "Already associated with the "
702 "selected AP.");
703 }
704 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
705 } else {
706 wpa_printf(MSG_DEBUG, "No suitable AP found.");
707 timeout = 5;
708 goto req_scan;
709 }
710
711 return;
712
713 req_scan:
714 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
715 /*
716 * Quick recovery if the initial scan results were not
717 * complete when fetched before the first scan request.
718 */
719 wpa_s->scan_res_tried++;
720 timeout = 0;
721 } else if (!wpa_supplicant_enabled_networks(wpa_s->conf)) {
722 /*
723 * No networks are enabled; short-circuit request so
724 * we don't wait timeout seconds before transitioning
725 * to INACTIVE state.
726 */
727 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
728 return;
729 }
730 wpa_supplicant_req_scan(wpa_s, timeout, 0);
731 }
732 #endif /* CONFIG_NO_SCAN_PROCESSING */
733
734
735 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
736 union wpa_event_data *data)
737 {
738 int l, len, found = 0, wpa_found, rsn_found;
739 u8 *p;
740
741 wpa_printf(MSG_DEBUG, "Association info event");
742 if (data->assoc_info.req_ies)
743 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
744 data->assoc_info.req_ies_len);
745 if (data->assoc_info.resp_ies)
746 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
747 data->assoc_info.resp_ies_len);
748 if (data->assoc_info.beacon_ies)
749 wpa_hexdump(MSG_DEBUG, "beacon_ies",
750 data->assoc_info.beacon_ies,
751 data->assoc_info.beacon_ies_len);
752
753 p = data->assoc_info.req_ies;
754 l = data->assoc_info.req_ies_len;
755
756 /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
757 while (p && l >= 2) {
758 len = p[1] + 2;
759 if (len > l) {
760 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
761 p, l);
762 break;
763 }
764 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
765 (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
766 (p[0] == WLAN_EID_RSN && p[1] >= 2)) {
767 if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
768 break;
769 found = 1;
770 wpa_find_assoc_pmkid(wpa_s);
771 break;
772 }
773 l -= len;
774 p += len;
775 }
776 if (!found && data->assoc_info.req_ies)
777 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
778
779 /* WPA/RSN IE from Beacon/ProbeResp */
780 p = data->assoc_info.beacon_ies;
781 l = data->assoc_info.beacon_ies_len;
782
783 /* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
784 */
785 wpa_found = rsn_found = 0;
786 while (p && l >= 2) {
787 len = p[1] + 2;
788 if (len > l) {
789 wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
790 p, l);
791 break;
792 }
793 if (!wpa_found &&
794 p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
795 os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
796 wpa_found = 1;
797 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
798 }
799
800 if (!rsn_found &&
801 p[0] == WLAN_EID_RSN && p[1] >= 2) {
802 rsn_found = 1;
803 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
804 }
805
806 l -= len;
807 p += len;
808 }
809
810 if (!wpa_found && data->assoc_info.beacon_ies)
811 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
812 if (!rsn_found && data->assoc_info.beacon_ies)
813 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
814 if (wpa_found || rsn_found)
815 wpa_s->ap_ies_from_associnfo = 1;
816 }
817
818
819 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
820 union wpa_event_data *data)
821 {
822 u8 bssid[ETH_ALEN];
823 int ft_completed = wpa_ft_is_completed(wpa_s->wpa);
824
825 if (data)
826 wpa_supplicant_event_associnfo(wpa_s, data);
827
828 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
829 if (wpa_s->use_client_mlme)
830 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
831 if (wpa_s->use_client_mlme ||
832 (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
833 os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
834 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
835 MACSTR, MAC2STR(bssid));
836 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
837 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
838 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
839 wpa_clear_keys(wpa_s, bssid);
840 }
841 if (wpa_supplicant_select_config(wpa_s) < 0) {
842 wpa_supplicant_disassociate(
843 wpa_s, WLAN_REASON_DEAUTH_LEAVING);
844 return;
845 }
846 }
847
848 wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
849 if (wpa_s->current_ssid) {
850 /* When using scanning (ap_scan=1), SIM PC/SC interface can be
851 * initialized before association, but for other modes,
852 * initialize PC/SC here, if the current configuration needs
853 * smartcard or SIM/USIM. */
854 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
855 }
856 wpa_sm_notify_assoc(wpa_s->wpa, bssid);
857 l2_packet_notify_auth_start(wpa_s->l2);
858
859 /*
860 * Set portEnabled first to FALSE in order to get EAP state machine out
861 * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
862 * state machine may transit to AUTHENTICATING state based on obsolete
863 * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
864 * AUTHENTICATED without ever giving chance to EAP state machine to
865 * reset the state.
866 */
867 if (!ft_completed) {
868 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
869 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
870 }
871 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
872 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
873 /* 802.1X::portControl = Auto */
874 eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
875 wpa_s->eapol_received = 0;
876 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
877 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
878 wpa_supplicant_cancel_auth_timeout(wpa_s);
879 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
880 } else if (!ft_completed) {
881 /* Timeout for receiving the first EAPOL packet */
882 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
883 }
884 wpa_supplicant_cancel_scan(wpa_s);
885
886 if (wpa_s->driver_4way_handshake &&
887 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
888 /*
889 * We are done; the driver will take care of RSN 4-way
890 * handshake.
891 */
892 wpa_supplicant_cancel_auth_timeout(wpa_s);
893 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
894 eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
895 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
896 }
897
898 if (wpa_s->pending_eapol_rx) {
899 struct os_time now, age;
900 os_get_time(&now);
901 os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age);
902 if (age.sec == 0 && age.usec < 100000 &&
903 os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) ==
904 0) {
905 wpa_printf(MSG_DEBUG, "Process pending EAPOL frame "
906 "that was received just before association "
907 "notification");
908 wpa_supplicant_rx_eapol(
909 wpa_s, wpa_s->pending_eapol_rx_src,
910 wpabuf_head(wpa_s->pending_eapol_rx),
911 wpabuf_len(wpa_s->pending_eapol_rx));
912 }
913 wpabuf_free(wpa_s->pending_eapol_rx);
914 wpa_s->pending_eapol_rx = NULL;
915 }
916 }
917
918
919 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
920 {
921 const u8 *bssid;
922
923 if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
924 /*
925 * At least Host AP driver and a Prism3 card seemed to be
926 * generating streams of disconnected events when configuring
927 * IBSS for WPA-None. Ignore them for now.
928 */
929 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
930 "IBSS/WPA-None mode");
931 return;
932 }
933
934 if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
935 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
936 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
937 "pre-shared key may be incorrect");
938 }
939 if (wpa_s->wpa_state >= WPA_ASSOCIATED)
940 wpa_supplicant_req_scan(wpa_s, 0, 100000);
941 bssid = wpa_s->bssid;
942 if (is_zero_ether_addr(bssid))
943 bssid = wpa_s->pending_bssid;
944 wpa_blacklist_add(wpa_s, bssid);
945 wpa_sm_notify_disassoc(wpa_s->wpa);
946 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
947 "remove keys");
948 if (wpa_supplicant_dynamic_keys(wpa_s)) {
949 wpa_s->keys_cleared = 0;
950 wpa_clear_keys(wpa_s, wpa_s->bssid);
951 }
952 wpa_supplicant_mark_disassoc(wpa_s);
953 }
954
955
956 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
957 static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx,
958 void *sock_ctx)
959 {
960 struct wpa_supplicant *wpa_s = eloop_ctx;
961
962 if (!wpa_s->pending_mic_error_report)
963 return;
964
965 wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report");
966 wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise);
967 wpa_s->pending_mic_error_report = 0;
968 }
969 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
970
971
972 static void
973 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
974 union wpa_event_data *data)
975 {
976 int pairwise;
977 struct os_time t;
978
979 wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
980 pairwise = (data && data->michael_mic_failure.unicast);
981 os_get_time(&t);
982 if ((wpa_s->last_michael_mic_error &&
983 t.sec - wpa_s->last_michael_mic_error <= 60) ||
984 wpa_s->pending_mic_error_report) {
985 if (wpa_s->pending_mic_error_report) {
986 /*
987 * Send the pending MIC error report immediately since
988 * we are going to start countermeasures and AP better
989 * do the same.
990 */
991 wpa_sm_key_request(wpa_s->wpa, 1,
992 wpa_s->pending_mic_error_pairwise);
993 }
994
995 /* Send the new MIC error report immediately since we are going
996 * to start countermeasures and AP better do the same.
997 */
998 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
999
1000 /* initialize countermeasures */
1001 wpa_s->countermeasures = 1;
1002 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
1003
1004 /*
1005 * Need to wait for completion of request frame. We do not get
1006 * any callback for the message completion, so just wait a
1007 * short while and hope for the best. */
1008 os_sleep(0, 10000);
1009
1010 wpa_drv_set_countermeasures(wpa_s, 1);
1011 wpa_supplicant_deauthenticate(wpa_s,
1012 WLAN_REASON_MICHAEL_MIC_FAILURE);
1013 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
1014 wpa_s, NULL);
1015 eloop_register_timeout(60, 0,
1016 wpa_supplicant_stop_countermeasures,
1017 wpa_s, NULL);
1018 /* TODO: mark the AP rejected for 60 second. STA is
1019 * allowed to associate with another AP.. */
1020 } else {
1021 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
1022 if (wpa_s->mic_errors_seen) {
1023 /*
1024 * Reduce the effectiveness of Michael MIC error
1025 * reports as a means for attacking against TKIP if
1026 * more than one MIC failure is noticed with the same
1027 * PTK. We delay the transmission of the reports by a
1028 * random time between 0 and 60 seconds in order to
1029 * force the attacker wait 60 seconds before getting
1030 * the information on whether a frame resulted in a MIC
1031 * failure.
1032 */
1033 u8 rval[4];
1034 int sec;
1035
1036 if (os_get_random(rval, sizeof(rval)) < 0)
1037 sec = os_random() % 60;
1038 else
1039 sec = WPA_GET_BE32(rval) % 60;
1040 wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d "
1041 "seconds", sec);
1042 wpa_s->pending_mic_error_report = 1;
1043 wpa_s->pending_mic_error_pairwise = pairwise;
1044 eloop_cancel_timeout(
1045 wpa_supplicant_delayed_mic_error_report,
1046 wpa_s, NULL);
1047 eloop_register_timeout(
1048 sec, os_random() % 1000000,
1049 wpa_supplicant_delayed_mic_error_report,
1050 wpa_s, NULL);
1051 } else {
1052 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1053 }
1054 #else /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1055 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1056 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1057 }
1058 wpa_s->last_michael_mic_error = t.sec;
1059 wpa_s->mic_errors_seen++;
1060 }
1061
1062
1063 #ifdef CONFIG_TERMINATE_ONLASTIF
1064 static int any_interfaces(struct wpa_supplicant *head)
1065 {
1066 struct wpa_supplicant *wpa_s;
1067
1068 for (wpa_s = head; wpa_s != NULL; wpa_s = wpa_s->next)
1069 if (!wpa_s->interface_removed)
1070 return 1;
1071 return 0;
1072 }
1073 #endif /* CONFIG_TERMINATE_ONLASTIF */
1074
1075 static void
1076 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
1077 union wpa_event_data *data)
1078 {
1079 if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
1080 return;
1081
1082 switch (data->interface_status.ievent) {
1083 case EVENT_INTERFACE_ADDED:
1084 if (!wpa_s->interface_removed)
1085 break;
1086 wpa_s->interface_removed = 0;
1087 wpa_printf(MSG_DEBUG, "Configured interface was added.");
1088 if (wpa_supplicant_driver_init(wpa_s) < 0) {
1089 wpa_printf(MSG_INFO, "Failed to initialize the driver "
1090 "after interface was added.");
1091 }
1092 break;
1093 case EVENT_INTERFACE_REMOVED:
1094 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
1095 wpa_s->interface_removed = 1;
1096 wpa_supplicant_mark_disassoc(wpa_s);
1097 l2_packet_deinit(wpa_s->l2);
1098 wpa_s->l2 = NULL;
1099 #ifdef CONFIG_TERMINATE_ONLASTIF
1100 /* check if last interface */
1101 if (!any_interfaces(wpa_s->global->ifaces))
1102 eloop_terminate();
1103 #endif /* CONFIG_TERMINATE_ONLASTIF */
1104 break;
1105 }
1106 }
1107
1108
1109 #ifdef CONFIG_PEERKEY
1110 static void
1111 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
1112 union wpa_event_data *data)
1113 {
1114 if (data == NULL)
1115 return;
1116 wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
1117 }
1118 #endif /* CONFIG_PEERKEY */
1119
1120
1121 #ifdef CONFIG_IEEE80211R
1122 static void
1123 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
1124 union wpa_event_data *data)
1125 {
1126 if (data == NULL)
1127 return;
1128
1129 if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
1130 data->ft_ies.ies_len,
1131 data->ft_ies.ft_action,
1132 data->ft_ies.target_ap) < 0) {
1133 /* TODO: prevent MLME/driver from trying to associate? */
1134 }
1135 }
1136 #endif /* CONFIG_IEEE80211R */
1137
1138
1139 void wpa_supplicant_event(void *ctx, wpa_event_type event,
1140 union wpa_event_data *data)
1141 {
1142 struct wpa_supplicant *wpa_s = ctx;
1143
1144 switch (event) {
1145 case EVENT_ASSOC:
1146 wpa_supplicant_event_assoc(wpa_s, data);
1147 break;
1148 case EVENT_DISASSOC:
1149 wpa_supplicant_event_disassoc(wpa_s);
1150 break;
1151 case EVENT_MICHAEL_MIC_FAILURE:
1152 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
1153 break;
1154 #ifndef CONFIG_NO_SCAN_PROCESSING
1155 case EVENT_SCAN_RESULTS:
1156 wpa_supplicant_event_scan_results(wpa_s);
1157 break;
1158 #endif /* CONFIG_NO_SCAN_PROCESSING */
1159 case EVENT_ASSOCINFO:
1160 wpa_supplicant_event_associnfo(wpa_s, data);
1161 break;
1162 case EVENT_INTERFACE_STATUS:
1163 wpa_supplicant_event_interface_status(wpa_s, data);
1164 break;
1165 case EVENT_PMKID_CANDIDATE:
1166 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
1167 break;
1168 #ifdef CONFIG_PEERKEY
1169 case EVENT_STKSTART:
1170 wpa_supplicant_event_stkstart(wpa_s, data);
1171 break;
1172 #endif /* CONFIG_PEERKEY */
1173 #ifdef CONFIG_IEEE80211R
1174 case EVENT_FT_RESPONSE:
1175 wpa_supplicant_event_ft_response(wpa_s, data);
1176 break;
1177 #endif /* CONFIG_IEEE80211R */
1178 default:
1179 wpa_printf(MSG_INFO, "Unknown event %d", event);
1180 break;
1181 }
1182 }
DragonFly BSD