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 "
231 wpa_supplicant_req_scan(wpa_s
, 1, 0);
235 /* TODO: add timeout on authentication */
238 * Association will be started based on the authentication event from
244 void sme_event_auth(struct wpa_supplicant
*wpa_s
, union wpa_event_data
*data
)
246 struct wpa_ssid
*ssid
= wpa_s
->current_ssid
;
249 wpa_printf(MSG_DEBUG
, "SME: Ignore authentication event when "
250 "network is not selected");
254 if (wpa_s
->wpa_state
!= WPA_AUTHENTICATING
) {
255 wpa_printf(MSG_DEBUG
, "SME: Ignore authentication event when "
256 "not in authenticating state");
260 if (os_memcmp(wpa_s
->pending_bssid
, data
->auth
.peer
, ETH_ALEN
) != 0) {
261 wpa_printf(MSG_DEBUG
, "SME: Ignore authentication with "
262 "unexpected peer " MACSTR
,
263 MAC2STR(data
->auth
.peer
));
267 wpa_printf(MSG_DEBUG
, "SME: Authentication response: peer=" MACSTR
268 " auth_type=%d status_code=%d",
269 MAC2STR(data
->auth
.peer
), data
->auth
.auth_type
,
270 data
->auth
.status_code
);
271 wpa_hexdump(MSG_MSGDUMP
, "SME: Authentication response IEs",
272 data
->auth
.ies
, data
->auth
.ies_len
);
274 if (data
->auth
.status_code
!= WLAN_STATUS_SUCCESS
) {
275 wpa_printf(MSG_DEBUG
, "SME: Authentication failed (status "
276 "code %d)", data
->auth
.status_code
);
278 if (data
->auth
.status_code
!=
279 WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG
||
280 wpa_s
->sme
.auth_alg
== data
->auth
.auth_type
||
281 wpa_s
->current_ssid
->auth_alg
== WPA_AUTH_ALG_LEAP
)
284 switch (data
->auth
.auth_type
) {
286 wpa_s
->current_ssid
->auth_alg
= WPA_AUTH_ALG_SHARED
;
288 wpa_printf(MSG_DEBUG
, "SME: Trying SHARED auth");
289 wpa_supplicant_associate(wpa_s
, wpa_s
->current_bss
,
290 wpa_s
->current_ssid
);
293 case WLAN_AUTH_SHARED_KEY
:
294 wpa_s
->current_ssid
->auth_alg
= WPA_AUTH_ALG_LEAP
;
296 wpa_printf(MSG_DEBUG
, "SME: Trying LEAP auth");
297 wpa_supplicant_associate(wpa_s
, wpa_s
->current_bss
,
298 wpa_s
->current_ssid
);
306 #ifdef CONFIG_IEEE80211R
307 if (data
->auth
.auth_type
== WLAN_AUTH_FT
) {
308 union wpa_event_data edata
;
309 os_memset(&edata
, 0, sizeof(edata
));
310 edata
.ft_ies
.ies
= data
->auth
.ies
;
311 edata
.ft_ies
.ies_len
= data
->auth
.ies_len
;
312 os_memcpy(edata
.ft_ies
.target_ap
, data
->auth
.peer
, ETH_ALEN
);
313 wpa_supplicant_event(wpa_s
, EVENT_FT_RESPONSE
, &edata
);
315 #endif /* CONFIG_IEEE80211R */
317 sme_associate(wpa_s
, ssid
->mode
, data
->auth
.peer
,
318 data
->auth
.auth_type
);
322 void sme_associate(struct wpa_supplicant
*wpa_s
, enum wpas_mode mode
,
323 const u8
*bssid
, u16 auth_type
)
325 struct wpa_driver_associate_params params
;
326 struct ieee802_11_elems elems
;
328 os_memset(¶ms
, 0, sizeof(params
));
329 params
.bssid
= bssid
;
330 params
.ssid
= wpa_s
->sme
.ssid
;
331 params
.ssid_len
= wpa_s
->sme
.ssid_len
;
332 params
.freq
= wpa_s
->sme
.freq
;
333 params
.wpa_ie
= wpa_s
->sme
.assoc_req_ie_len
?
334 wpa_s
->sme
.assoc_req_ie
: NULL
;
335 params
.wpa_ie_len
= wpa_s
->sme
.assoc_req_ie_len
;
336 #ifdef CONFIG_IEEE80211R
337 if (auth_type
== WLAN_AUTH_FT
&& wpa_s
->sme
.ft_ies
) {
338 params
.wpa_ie
= wpa_s
->sme
.ft_ies
;
339 params
.wpa_ie_len
= wpa_s
->sme
.ft_ies_len
;
341 #endif /* CONFIG_IEEE80211R */
343 params
.mgmt_frame_protection
= wpa_s
->sme
.mfp
;
344 if (wpa_s
->sme
.prev_bssid_set
)
345 params
.prev_bssid
= wpa_s
->sme
.prev_bssid
;
347 wpa_msg(wpa_s
, MSG_INFO
, "Trying to associate with " MACSTR
348 " (SSID='%s' freq=%d MHz)", MAC2STR(params
.bssid
),
349 params
.ssid
? wpa_ssid_txt(params
.ssid
, params
.ssid_len
) : "",
352 wpa_supplicant_set_state(wpa_s
, WPA_ASSOCIATING
);
354 if (params
.wpa_ie
== NULL
||
355 ieee802_11_parse_elems(params
.wpa_ie
, params
.wpa_ie_len
, &elems
, 0)
357 wpa_printf(MSG_DEBUG
, "SME: Could not parse own IEs?!");
358 os_memset(&elems
, 0, sizeof(elems
));
361 wpa_sm_set_assoc_wpa_ie(wpa_s
->wpa
, elems
.rsn_ie
- 2,
362 elems
.rsn_ie_len
+ 2);
363 else if (elems
.wpa_ie
)
364 wpa_sm_set_assoc_wpa_ie(wpa_s
->wpa
, elems
.wpa_ie
- 2,
365 elems
.wpa_ie_len
+ 2);
367 wpa_sm_set_assoc_wpa_ie(wpa_s
->wpa
, NULL
, 0);
369 if (wpa_drv_associate(wpa_s
, ¶ms
) < 0) {
370 wpa_msg(wpa_s
, MSG_INFO
, "Association request to the driver "
372 wpa_supplicant_req_scan(wpa_s
, 5, 0);
376 /* TODO: add timeout on association */
380 int sme_update_ft_ies(struct wpa_supplicant
*wpa_s
, const u8
*md
,
381 const u8
*ies
, size_t ies_len
)
383 if (md
== NULL
|| ies
== NULL
) {
384 wpa_printf(MSG_DEBUG
, "SME: Remove mobility domain");
385 os_free(wpa_s
->sme
.ft_ies
);
386 wpa_s
->sme
.ft_ies
= NULL
;
387 wpa_s
->sme
.ft_ies_len
= 0;
388 wpa_s
->sme
.ft_used
= 0;
392 os_memcpy(wpa_s
->sme
.mobility_domain
, md
, MOBILITY_DOMAIN_ID_LEN
);
393 wpa_hexdump(MSG_DEBUG
, "SME: FT IEs", ies
, ies_len
);
394 os_free(wpa_s
->sme
.ft_ies
);
395 wpa_s
->sme
.ft_ies
= os_malloc(ies_len
);
396 if (wpa_s
->sme
.ft_ies
== NULL
)
398 os_memcpy(wpa_s
->sme
.ft_ies
, ies
, ies_len
);
399 wpa_s
->sme
.ft_ies_len
= ies_len
;
404 void sme_event_assoc_reject(struct wpa_supplicant
*wpa_s
,
405 union wpa_event_data
*data
)
410 wpa_printf(MSG_DEBUG
, "SME: Association with " MACSTR
" failed: "
411 "status code %d", MAC2STR(wpa_s
->pending_bssid
),
412 data
->assoc_reject
.status_code
);
414 bssid_changed
= !is_zero_ether_addr(wpa_s
->bssid
);
417 * For now, unconditionally terminate the previous authentication. In
418 * theory, this should not be needed, but mac80211 gets quite confused
419 * if the authentication is left pending.. Some roaming cases might
420 * benefit from using the previous authentication, so this could be
421 * optimized in the future.
423 if (wpa_drv_deauthenticate(wpa_s
, wpa_s
->pending_bssid
,
424 WLAN_REASON_DEAUTH_LEAVING
) < 0) {
425 wpa_msg(wpa_s
, MSG_INFO
,
426 "Deauth request to the driver failed");
428 wpa_s
->sme
.prev_bssid_set
= 0;
430 if (wpa_blacklist_add(wpa_s
, wpa_s
->pending_bssid
) == 0) {
431 struct wpa_blacklist
*b
;
432 b
= wpa_blacklist_get(wpa_s
, wpa_s
->pending_bssid
);
433 if (b
&& b
->count
< 3) {
435 * Speed up next attempt if there could be other APs
436 * that could accept association.
441 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
442 os_memset(wpa_s
->bssid
, 0, ETH_ALEN
);
443 os_memset(wpa_s
->pending_bssid
, 0, ETH_ALEN
);
445 wpas_notify_bssid_changed(wpa_s
);
448 * TODO: if more than one possible AP is available in scan results,
449 * could try the other ones before requesting a new scan.
451 wpa_supplicant_req_scan(wpa_s
, timeout
/ 1000,
452 1000 * (timeout
% 1000));
456 void sme_event_auth_timed_out(struct wpa_supplicant
*wpa_s
,
457 union wpa_event_data
*data
)
459 wpa_printf(MSG_DEBUG
, "SME: Authentication timed out");
460 wpa_supplicant_req_scan(wpa_s
, 5, 0);
464 void sme_event_assoc_timed_out(struct wpa_supplicant
*wpa_s
,
465 union wpa_event_data
*data
)
467 wpa_printf(MSG_DEBUG
, "SME: Association timed out");
468 wpa_supplicant_mark_disassoc(wpa_s
);
469 wpa_supplicant_req_scan(wpa_s
, 5, 0);
473 void sme_event_disassoc(struct wpa_supplicant
*wpa_s
,
474 union wpa_event_data
*data
)
476 wpa_printf(MSG_DEBUG
, "SME: Disassociation event received");
477 if (wpa_s
->sme
.prev_bssid_set
&&
478 !(wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_USER_SPACE_MLME
)) {
480 * cfg80211/mac80211 can get into somewhat confused state if
481 * the AP only disassociates us and leaves us in authenticated
482 * state. For now, force the state to be cleared to avoid
483 * confusing errors if we try to associate with the AP again.
485 wpa_printf(MSG_DEBUG
, "SME: Deauthenticate to clear driver "
487 wpa_drv_deauthenticate(wpa_s
, wpa_s
->sme
.prev_bssid
,
488 WLAN_REASON_DEAUTH_LEAVING
);