3 * Copyright (c) 2009-2010, 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 "common/ieee802_11_common.h"
20 #include "eapol_supp/eapol_supp_sm.h"
21 #include "common/wpa_common.h"
22 #include "rsn_supp/wpa.h"
23 #include "rsn_supp/pmksa_cache.h"
25 #include "wpa_supplicant_i.h"
27 #include "wpas_glue.h"
28 #include "wps_supplicant.h"
30 #include "blacklist.h"
35 void sme_authenticate(struct wpa_supplicant *wpa_s,
36 struct wpa_bss *bss, struct wpa_ssid *ssid)
38 struct wpa_driver_auth_params params;
39 struct wpa_ssid *old_ssid;
40 #ifdef CONFIG_IEEE80211R
42 #endif /* CONFIG_IEEE80211R */
43 #ifdef CONFIG_IEEE80211R
45 #endif /* CONFIG_IEEE80211R */
49 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
54 wpa_s->current_bss = bss;
56 os_memset(¶ms, 0, sizeof(params));
57 wpa_s->reassociate = 0;
59 params.freq = bss->freq;
60 params.bssid = bss->bssid;
61 params.ssid = bss->ssid;
62 params.ssid_len = bss->ssid_len;
64 if (wpa_s->sme.ssid_len != params.ssid_len ||
65 os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
66 wpa_s->sme.prev_bssid_set = 0;
68 wpa_s->sme.freq = params.freq;
69 os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
70 wpa_s->sme.ssid_len = params.ssid_len;
72 params.auth_alg = WPA_AUTH_ALG_OPEN;
73 #ifdef IEEE8021X_EAPOL
74 if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
76 if (ssid->non_leap == 0)
77 params.auth_alg = WPA_AUTH_ALG_LEAP;
79 params.auth_alg |= WPA_AUTH_ALG_LEAP;
82 #endif /* IEEE8021X_EAPOL */
83 wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
86 params.auth_alg = ssid->auth_alg;
87 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
91 for (i = 0; i < NUM_WEP_KEYS; i++) {
92 if (ssid->wep_key_len[i])
93 params.wep_key[i] = ssid->wep_key[i];
94 params.wep_key_len[i] = ssid->wep_key_len[i];
96 params.wep_tx_keyidx = ssid->wep_tx_keyidx;
98 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
99 os_memset(wpa_s->bssid, 0, ETH_ALEN);
100 os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
102 wpas_notify_bssid_changed(wpa_s);
104 if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
105 wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
106 (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
107 WPA_KEY_MGMT_FT_IEEE8021X |
108 WPA_KEY_MGMT_FT_PSK |
109 WPA_KEY_MGMT_IEEE8021X_SHA256 |
110 WPA_KEY_MGMT_PSK_SHA256))) {
111 int try_opportunistic;
112 try_opportunistic = ssid->proactive_key_caching &&
113 (ssid->proto & WPA_PROTO_RSN);
114 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
116 try_opportunistic) == 0)
117 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
118 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
119 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
120 wpa_s->sme.assoc_req_ie,
121 &wpa_s->sme.assoc_req_ie_len)) {
122 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
123 "management and encryption suites");
126 } else if (ssid->key_mgmt &
127 (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
128 WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
129 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
130 WPA_KEY_MGMT_IEEE8021X_SHA256)) {
131 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
132 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
133 wpa_s->sme.assoc_req_ie,
134 &wpa_s->sme.assoc_req_ie_len)) {
135 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
136 "management and encryption suites (no scan "
141 } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
142 struct wpabuf *wps_ie;
143 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
144 if (wps_ie && wpabuf_len(wps_ie) <=
145 sizeof(wpa_s->sme.assoc_req_ie)) {
146 wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
147 os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
148 wpa_s->sme.assoc_req_ie_len);
150 wpa_s->sme.assoc_req_ie_len = 0;
152 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
153 #endif /* CONFIG_WPS */
155 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
156 wpa_s->sme.assoc_req_ie_len = 0;
159 #ifdef CONFIG_IEEE80211R
160 ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
161 if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
163 wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
165 /* Prepare for the next transition */
166 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
169 if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
170 WPA_KEY_MGMT_FT_IEEE8021X)) {
171 if (wpa_s->sme.assoc_req_ie_len + 5 <
172 sizeof(wpa_s->sme.assoc_req_ie)) {
173 struct rsn_mdie *mdie;
174 u8 *pos = wpa_s->sme.assoc_req_ie +
175 wpa_s->sme.assoc_req_ie_len;
176 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
177 *pos++ = sizeof(*mdie);
178 mdie = (struct rsn_mdie *) pos;
179 os_memcpy(mdie->mobility_domain, md,
180 MOBILITY_DOMAIN_ID_LEN);
181 mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
182 wpa_s->sme.assoc_req_ie_len += 5;
185 if (wpa_s->sme.ft_used &&
186 os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
187 wpa_sm_has_ptk(wpa_s->wpa)) {
188 wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
190 params.auth_alg = WPA_AUTH_ALG_FT;
191 params.ie = wpa_s->sme.ft_ies;
192 params.ie_len = wpa_s->sme.ft_ies_len;
195 #endif /* CONFIG_IEEE80211R */
197 #ifdef CONFIG_IEEE80211W
198 wpa_s->sme.mfp = ssid->ieee80211w;
199 if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
200 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
201 struct wpa_ie_data _ie;
202 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
204 (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
205 wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
207 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
210 #endif /* CONFIG_IEEE80211W */
212 wpa_supplicant_cancel_scan(wpa_s);
214 wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
215 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
216 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
218 wpa_clear_keys(wpa_s, bss->bssid);
219 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
220 old_ssid = wpa_s->current_ssid;
221 wpa_s->current_ssid = ssid;
222 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
223 wpa_supplicant_initiate_eapol(wpa_s);
224 if (old_ssid != wpa_s->current_ssid)
225 wpas_notify_network_changed(wpa_s);
227 wpa_s->sme.auth_alg = params.auth_alg;
228 if (wpa_drv_authenticate(wpa_s, ¶ms) < 0) {
229 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
234 /* TODO: add timeout on authentication */
237 * Association will be started based on the authentication event from
243 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
245 struct wpa_ssid *ssid = wpa_s->current_ssid;
248 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
249 "network is not selected");
253 if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
254 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
255 "not in authenticating state");
259 if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
260 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
261 "unexpected peer " MACSTR,
262 MAC2STR(data->auth.peer));
266 wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
267 " auth_type=%d status_code=%d",
268 MAC2STR(data->auth.peer), data->auth.auth_type,
269 data->auth.status_code);
270 wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
271 data->auth.ies, data->auth.ies_len);
273 if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
274 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
275 "code %d)", data->auth.status_code);
279 #ifdef CONFIG_IEEE80211R
280 if (data->auth.auth_type == WLAN_AUTH_FT) {
281 union wpa_event_data edata;
282 os_memset(&edata, 0, sizeof(edata));
283 edata.ft_ies.ies = data->auth.ies;
284 edata.ft_ies.ies_len = data->auth.ies_len;
285 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
286 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
288 #endif /* CONFIG_IEEE80211R */
290 sme_associate(wpa_s, ssid->mode, data->auth.peer,
291 data->auth.auth_type);
295 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
296 const u8 *bssid, u16 auth_type)
298 struct wpa_driver_associate_params params;
299 struct ieee802_11_elems elems;
301 os_memset(¶ms, 0, sizeof(params));
302 params.bssid = bssid;
303 params.ssid = wpa_s->sme.ssid;
304 params.ssid_len = wpa_s->sme.ssid_len;
305 params.freq = wpa_s->sme.freq;
306 params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
307 wpa_s->sme.assoc_req_ie : NULL;
308 params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
309 #ifdef CONFIG_IEEE80211R
310 if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
311 params.wpa_ie = wpa_s->sme.ft_ies;
312 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
314 #endif /* CONFIG_IEEE80211R */
316 params.mgmt_frame_protection = wpa_s->sme.mfp;
317 if (wpa_s->sme.prev_bssid_set)
318 params.prev_bssid = wpa_s->sme.prev_bssid;
320 wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
321 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
322 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
325 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
327 if (params.wpa_ie == NULL ||
328 ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
330 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
331 os_memset(&elems, 0, sizeof(elems));
334 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
335 elems.rsn_ie_len + 2);
336 else if (elems.wpa_ie)
337 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
338 elems.wpa_ie_len + 2);
340 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
342 if (wpa_drv_associate(wpa_s, ¶ms) < 0) {
343 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
345 wpa_supplicant_req_scan(wpa_s, 5, 0);
349 /* TODO: add timeout on association */
353 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
354 const u8 *ies, size_t ies_len)
356 if (md == NULL || ies == NULL) {
357 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
358 os_free(wpa_s->sme.ft_ies);
359 wpa_s->sme.ft_ies = NULL;
360 wpa_s->sme.ft_ies_len = 0;
361 wpa_s->sme.ft_used = 0;
365 os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
366 wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
367 os_free(wpa_s->sme.ft_ies);
368 wpa_s->sme.ft_ies = os_malloc(ies_len);
369 if (wpa_s->sme.ft_ies == NULL)
371 os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
372 wpa_s->sme.ft_ies_len = ies_len;
377 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
378 union wpa_event_data *data)
383 wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
384 "status code %d", MAC2STR(wpa_s->pending_bssid),
385 data->assoc_reject.status_code);
387 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
390 * For now, unconditionally terminate the previous authentication. In
391 * theory, this should not be needed, but mac80211 gets quite confused
392 * if the authentication is left pending.. Some roaming cases might
393 * benefit from using the previous authentication, so this could be
394 * optimized in the future.
396 if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
397 WLAN_REASON_DEAUTH_LEAVING) < 0) {
398 wpa_msg(wpa_s, MSG_INFO,
399 "Deauth request to the driver failed");
401 wpa_s->sme.prev_bssid_set = 0;
403 if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
404 struct wpa_blacklist *b;
405 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
406 if (b && b->count < 3) {
408 * Speed up next attempt if there could be other APs
409 * that could accept association.
414 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
415 os_memset(wpa_s->bssid, 0, ETH_ALEN);
416 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
418 wpas_notify_bssid_changed(wpa_s);
421 * TODO: if more than one possible AP is available in scan results,
422 * could try the other ones before requesting a new scan.
424 wpa_supplicant_req_scan(wpa_s, timeout / 1000,
425 1000 * (timeout % 1000));
429 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
430 union wpa_event_data *data)
432 wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
433 wpa_supplicant_req_scan(wpa_s, 5, 0);
437 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
438 union wpa_event_data *data)
440 wpa_printf(MSG_DEBUG, "SME: Association timed out");
441 wpa_supplicant_mark_disassoc(wpa_s);
442 wpa_supplicant_req_scan(wpa_s, 5, 0);
446 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
447 union wpa_event_data *data)
449 wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
450 if (!is_zero_ether_addr(wpa_s->bssid) &&
451 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
453 * cfg80211/mac80211 can get into somewhat confused state if
454 * the AP only disassociates us and leaves us in authenticated
455 * state. For now, force the state to be cleared to avoid
456 * confusing errors if we try to associate with the AP again.
458 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
460 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
461 WLAN_REASON_DEAUTH_LEAVING);