3 * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 #include "common/ieee802_11_defs.h"
19 #include "eapol_supp/eapol_supp_sm.h"
20 #include "common/wpa_common.h"
21 #include "rsn_supp/wpa.h"
22 #include "rsn_supp/pmksa_cache.h"
24 #include "wpa_supplicant_i.h"
26 #include "wpas_glue.h"
27 #include "wps_supplicant.h"
29 #include "blacklist.h"
34 void sme_authenticate(struct wpa_supplicant *wpa_s,
35 struct wpa_bss *bss, struct wpa_ssid *ssid)
37 struct wpa_driver_auth_params params;
38 struct wpa_ssid *old_ssid;
39 #ifdef CONFIG_IEEE80211R
41 #endif /* CONFIG_IEEE80211R */
42 #ifdef CONFIG_IEEE80211R
44 #endif /* CONFIG_IEEE80211R */
48 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
53 wpa_s->current_bss = bss;
55 os_memset(¶ms, 0, sizeof(params));
56 wpa_s->reassociate = 0;
58 params.freq = bss->freq;
59 params.bssid = bss->bssid;
60 params.ssid = bss->ssid;
61 params.ssid_len = bss->ssid_len;
63 if (wpa_s->sme.ssid_len != params.ssid_len ||
64 os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
65 wpa_s->sme.prev_bssid_set = 0;
67 wpa_s->sme.freq = params.freq;
68 os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
69 wpa_s->sme.ssid_len = params.ssid_len;
71 params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
72 #ifdef IEEE8021X_EAPOL
73 if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
75 if (ssid->non_leap == 0)
76 params.auth_alg = AUTH_ALG_LEAP;
78 params.auth_alg |= AUTH_ALG_LEAP;
81 #endif /* IEEE8021X_EAPOL */
82 wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
86 if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
87 params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
88 if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
89 params.auth_alg |= AUTH_ALG_SHARED_KEY;
90 if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
91 params.auth_alg |= AUTH_ALG_LEAP;
92 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
96 for (i = 0; i < NUM_WEP_KEYS; i++) {
97 if (ssid->wep_key_len[i])
98 params.wep_key[i] = ssid->wep_key[i];
99 params.wep_key_len[i] = ssid->wep_key_len[i];
101 params.wep_tx_keyidx = ssid->wep_tx_keyidx;
103 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
104 os_memset(wpa_s->bssid, 0, ETH_ALEN);
105 os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
107 wpas_notify_bssid_changed(wpa_s);
109 if (bss && (wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
110 wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
111 (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
112 WPA_KEY_MGMT_FT_IEEE8021X |
113 WPA_KEY_MGMT_FT_PSK |
114 WPA_KEY_MGMT_IEEE8021X_SHA256 |
115 WPA_KEY_MGMT_PSK_SHA256))) {
116 int try_opportunistic;
117 try_opportunistic = ssid->proactive_key_caching &&
118 (ssid->proto & WPA_PROTO_RSN);
119 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
121 try_opportunistic) == 0)
122 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
123 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
124 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
125 wpa_s->sme.assoc_req_ie,
126 &wpa_s->sme.assoc_req_ie_len)) {
127 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
128 "management and encryption suites");
131 } else if (ssid->key_mgmt &
132 (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
133 WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
134 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
135 WPA_KEY_MGMT_IEEE8021X_SHA256)) {
136 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
137 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
138 wpa_s->sme.assoc_req_ie,
139 &wpa_s->sme.assoc_req_ie_len)) {
140 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
141 "management and encryption suites (no scan "
146 } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
147 struct wpabuf *wps_ie;
148 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
149 if (wps_ie && wpabuf_len(wps_ie) <=
150 sizeof(wpa_s->sme.assoc_req_ie)) {
151 wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
152 os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
153 wpa_s->sme.assoc_req_ie_len);
155 wpa_s->sme.assoc_req_ie_len = 0;
157 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
158 #endif /* CONFIG_WPS */
160 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
161 wpa_s->sme.assoc_req_ie_len = 0;
164 #ifdef CONFIG_IEEE80211R
165 ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
166 if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
168 wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
170 /* Prepare for the next transition */
171 wpa_ft_prepare_auth_request(wpa_s->wpa);
174 if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
175 WPA_KEY_MGMT_FT_IEEE8021X)) {
176 if (wpa_s->sme.assoc_req_ie_len + 5 <
177 sizeof(wpa_s->sme.assoc_req_ie)) {
178 struct rsn_mdie *mdie;
179 u8 *pos = wpa_s->sme.assoc_req_ie +
180 wpa_s->sme.assoc_req_ie_len;
181 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
182 *pos++ = sizeof(*mdie);
183 mdie = (struct rsn_mdie *) pos;
184 os_memcpy(mdie->mobility_domain, md,
185 MOBILITY_DOMAIN_ID_LEN);
187 wpa_s->sme.assoc_req_ie_len += 5;
190 if (wpa_s->sme.ft_used &&
191 os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0) {
192 wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
194 params.auth_alg = AUTH_ALG_FT;
195 params.ie = wpa_s->sme.ft_ies;
196 params.ie_len = wpa_s->sme.ft_ies_len;
199 #endif /* CONFIG_IEEE80211R */
201 #ifdef CONFIG_IEEE80211W
202 switch (ssid->ieee80211w) {
204 wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
206 case IEEE80211W_OPTIONAL:
207 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
209 case IEEE80211W_REQUIRED:
210 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
213 if (ssid->ieee80211w != NO_IEEE80211W && bss) {
214 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
215 struct wpa_ie_data _ie;
216 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
218 (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
219 wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
221 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
224 #endif /* CONFIG_IEEE80211W */
226 wpa_supplicant_cancel_scan(wpa_s);
228 wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
229 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
230 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
232 wpa_clear_keys(wpa_s, bss->bssid);
233 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
234 old_ssid = wpa_s->current_ssid;
235 wpa_s->current_ssid = ssid;
236 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
237 wpa_supplicant_initiate_eapol(wpa_s);
238 if (old_ssid != wpa_s->current_ssid)
239 wpas_notify_network_changed(wpa_s);
241 if (wpa_drv_authenticate(wpa_s, ¶ms) < 0) {
242 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
247 /* TODO: add timeout on authentication */
250 * Association will be started based on the authentication event from
256 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
258 struct wpa_driver_associate_params params;
259 struct wpa_ssid *ssid = wpa_s->current_ssid;
262 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
263 "network is not selected");
267 if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
268 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
269 "not in authenticating state");
273 if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
274 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
275 "unexpected peer " MACSTR,
276 MAC2STR(data->auth.peer));
280 wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
281 " auth_type=%d status_code=%d",
282 MAC2STR(data->auth.peer), data->auth.auth_type,
283 data->auth.status_code);
284 wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
285 data->auth.ies, data->auth.ies_len);
287 if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
288 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
289 "code %d)", data->auth.status_code);
293 #ifdef CONFIG_IEEE80211R
294 if (data->auth.auth_type == WLAN_AUTH_FT) {
295 union wpa_event_data edata;
296 os_memset(&edata, 0, sizeof(edata));
297 edata.ft_ies.ies = data->auth.ies;
298 edata.ft_ies.ies_len = data->auth.ies_len;
299 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
300 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
302 #endif /* CONFIG_IEEE80211R */
304 os_memset(¶ms, 0, sizeof(params));
305 params.bssid = data->auth.peer;
306 params.ssid = wpa_s->sme.ssid;
307 params.ssid_len = wpa_s->sme.ssid_len;
308 params.freq = wpa_s->sme.freq;
309 params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
310 wpa_s->sme.assoc_req_ie : NULL;
311 params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
312 #ifdef CONFIG_IEEE80211R
313 if (data->auth.auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
314 params.wpa_ie = wpa_s->sme.ft_ies;
315 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
317 #endif /* CONFIG_IEEE80211R */
318 params.mode = ssid->mode;
319 params.mgmt_frame_protection = wpa_s->sme.mfp;
320 if (wpa_s->sme.prev_bssid_set)
321 params.prev_bssid = wpa_s->sme.prev_bssid;
323 wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
324 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
325 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
328 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
330 if (wpa_drv_associate(wpa_s, ¶ms) < 0) {
331 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
336 /* TODO: add timeout on association */
340 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
341 const u8 *ies, size_t ies_len)
343 if (md == NULL || ies == NULL) {
344 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
345 os_free(wpa_s->sme.ft_ies);
346 wpa_s->sme.ft_ies = NULL;
347 wpa_s->sme.ft_ies_len = 0;
348 wpa_s->sme.ft_used = 0;
352 os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
353 wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
354 os_free(wpa_s->sme.ft_ies);
355 wpa_s->sme.ft_ies = os_malloc(ies_len);
356 if (wpa_s->sme.ft_ies == NULL)
358 os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
359 wpa_s->sme.ft_ies_len = ies_len;
364 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
365 union wpa_event_data *data)
370 wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
371 "status code %d", MAC2STR(wpa_s->pending_bssid),
372 data->assoc_reject.status_code);
374 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
377 * For now, unconditionally terminate the previous authentication. In
378 * theory, this should not be needed, but mac80211 gets quite confused
379 * if the authentication is left pending.. Some roaming cases might
380 * benefit from using the previous authentication, so this could be
381 * optimized in the future.
383 if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
384 WLAN_REASON_DEAUTH_LEAVING) < 0) {
385 wpa_msg(wpa_s, MSG_INFO,
386 "Deauth request to the driver failed");
388 wpa_s->sme.prev_bssid_set = 0;
390 if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
391 struct wpa_blacklist *b;
392 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
393 if (b && b->count < 3) {
395 * Speed up next attempt if there could be other APs
396 * that could accept association.
401 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
402 os_memset(wpa_s->bssid, 0, ETH_ALEN);
403 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
405 wpas_notify_bssid_changed(wpa_s);
408 * TODO: if more than one possible AP is available in scan results,
409 * could try the other ones before requesting a new scan.
411 wpa_supplicant_req_scan(wpa_s, timeout / 1000,
412 1000 * (timeout % 1000));
416 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
417 union wpa_event_data *data)
419 wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
420 wpa_supplicant_req_scan(wpa_s, 5, 0);
424 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
425 union wpa_event_data *data)
427 wpa_printf(MSG_DEBUG, "SME: Association timed out");
428 wpa_supplicant_mark_disassoc(wpa_s);
429 wpa_supplicant_req_scan(wpa_s, 5, 0);
433 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
434 union wpa_event_data *data)
436 wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
437 if (!is_zero_ether_addr(wpa_s->bssid) &&
438 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
440 * cfg80211/mac80211 can get into somewhat confused state if
441 * the AP only disassociates us and leaves us in authenticated
442 * state. For now, force the state to be cleared to avoid
443 * confusing errors if we try to associate with the AP again.
445 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
447 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
448 WLAN_REASON_DEAUTH_LEAVING);