39efeddfafd5283f2a3139a6a597822afb95262c
[dragonfly.git] / contrib / wpa_supplicant / 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
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 static void
1064 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
1065                                       union wpa_event_data *data)
1066 {
1067         if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
1068                 return;
1069
1070         switch (data->interface_status.ievent) {
1071         case EVENT_INTERFACE_ADDED:
1072                 if (!wpa_s->interface_removed)
1073                         break;
1074                 wpa_s->interface_removed = 0;
1075                 wpa_printf(MSG_DEBUG, "Configured interface was added.");
1076                 if (wpa_supplicant_driver_init(wpa_s) < 0) {
1077                         wpa_printf(MSG_INFO, "Failed to initialize the driver "
1078                                    "after interface was added.");
1079                 }
1080                 break;
1081         case EVENT_INTERFACE_REMOVED:
1082                 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
1083                 wpa_s->interface_removed = 1;
1084                 wpa_supplicant_mark_disassoc(wpa_s);
1085                 l2_packet_deinit(wpa_s->l2);
1086                 wpa_s->l2 = NULL;
1087                 break;
1088         }
1089 }
1090
1091
1092 #ifdef CONFIG_PEERKEY
1093 static void
1094 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
1095                               union wpa_event_data *data)
1096 {
1097         if (data == NULL)
1098                 return;
1099         wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
1100 }
1101 #endif /* CONFIG_PEERKEY */
1102
1103
1104 #ifdef CONFIG_IEEE80211R
1105 static void
1106 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
1107                                  union wpa_event_data *data)
1108 {
1109         if (data == NULL)
1110                 return;
1111
1112         if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
1113                                     data->ft_ies.ies_len,
1114                                     data->ft_ies.ft_action,
1115                                     data->ft_ies.target_ap) < 0) {
1116                 /* TODO: prevent MLME/driver from trying to associate? */
1117         }
1118 }
1119 #endif /* CONFIG_IEEE80211R */
1120
1121
1122 void wpa_supplicant_event(void *ctx, wpa_event_type event,
1123                           union wpa_event_data *data)
1124 {
1125         struct wpa_supplicant *wpa_s = ctx;
1126
1127         switch (event) {
1128         case EVENT_ASSOC:
1129                 wpa_supplicant_event_assoc(wpa_s, data);
1130                 break;
1131         case EVENT_DISASSOC:
1132                 wpa_supplicant_event_disassoc(wpa_s);
1133                 break;
1134         case EVENT_MICHAEL_MIC_FAILURE:
1135                 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
1136                 break;
1137 #ifndef CONFIG_NO_SCAN_PROCESSING
1138         case EVENT_SCAN_RESULTS:
1139                 wpa_supplicant_event_scan_results(wpa_s);
1140                 break;
1141 #endif /* CONFIG_NO_SCAN_PROCESSING */
1142         case EVENT_ASSOCINFO:
1143                 wpa_supplicant_event_associnfo(wpa_s, data);
1144                 break;
1145         case EVENT_INTERFACE_STATUS:
1146                 wpa_supplicant_event_interface_status(wpa_s, data);
1147                 break;
1148         case EVENT_PMKID_CANDIDATE:
1149                 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
1150                 break;
1151 #ifdef CONFIG_PEERKEY
1152         case EVENT_STKSTART:
1153                 wpa_supplicant_event_stkstart(wpa_s, data);
1154                 break;
1155 #endif /* CONFIG_PEERKEY */
1156 #ifdef CONFIG_IEEE80211R
1157         case EVENT_FT_RESPONSE:
1158                 wpa_supplicant_event_ft_response(wpa_s, data);
1159                 break;
1160 #endif /* CONFIG_IEEE80211R */
1161         default:
1162                 wpa_printf(MSG_INFO, "Unknown event %d", event);
1163                 break;
1164         }
1165 }