sme.c 15 KB

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  1. /*
  2. * wpa_supplicant - SME
  3. * Copyright (c) 2009-2010, 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. #include "includes.h"
  15. #include "common.h"
  16. #include "common/ieee802_11_defs.h"
  17. #include "common/ieee802_11_common.h"
  18. #include "eapol_supp/eapol_supp_sm.h"
  19. #include "common/wpa_common.h"
  20. #include "rsn_supp/wpa.h"
  21. #include "rsn_supp/pmksa_cache.h"
  22. #include "config.h"
  23. #include "wpa_supplicant_i.h"
  24. #include "driver_i.h"
  25. #include "wpas_glue.h"
  26. #include "wps_supplicant.h"
  27. #include "p2p_supplicant.h"
  28. #include "notify.h"
  29. #include "blacklist.h"
  30. #include "bss.h"
  31. #include "scan.h"
  32. #include "sme.h"
  33. void sme_authenticate(struct wpa_supplicant *wpa_s,
  34. struct wpa_bss *bss, struct wpa_ssid *ssid)
  35. {
  36. struct wpa_driver_auth_params params;
  37. struct wpa_ssid *old_ssid;
  38. #ifdef CONFIG_IEEE80211R
  39. const u8 *ie;
  40. #endif /* CONFIG_IEEE80211R */
  41. #ifdef CONFIG_IEEE80211R
  42. const u8 *md = NULL;
  43. #endif /* CONFIG_IEEE80211R */
  44. int i, bssid_changed;
  45. if (bss == NULL) {
  46. wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  47. "network");
  48. return;
  49. }
  50. wpa_s->current_bss = bss;
  51. os_memset(&params, 0, sizeof(params));
  52. wpa_s->reassociate = 0;
  53. params.freq = bss->freq;
  54. params.bssid = bss->bssid;
  55. params.ssid = bss->ssid;
  56. params.ssid_len = bss->ssid_len;
  57. if (wpa_s->sme.ssid_len != params.ssid_len ||
  58. os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
  59. wpa_s->sme.prev_bssid_set = 0;
  60. wpa_s->sme.freq = params.freq;
  61. os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  62. wpa_s->sme.ssid_len = params.ssid_len;
  63. params.auth_alg = WPA_AUTH_ALG_OPEN;
  64. #ifdef IEEE8021X_EAPOL
  65. if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  66. if (ssid->leap) {
  67. if (ssid->non_leap == 0)
  68. params.auth_alg = WPA_AUTH_ALG_LEAP;
  69. else
  70. params.auth_alg |= WPA_AUTH_ALG_LEAP;
  71. }
  72. }
  73. #endif /* IEEE8021X_EAPOL */
  74. wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  75. params.auth_alg);
  76. if (ssid->auth_alg) {
  77. params.auth_alg = ssid->auth_alg;
  78. wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  79. params.auth_alg);
  80. }
  81. for (i = 0; i < NUM_WEP_KEYS; i++) {
  82. if (ssid->wep_key_len[i])
  83. params.wep_key[i] = ssid->wep_key[i];
  84. params.wep_key_len[i] = ssid->wep_key_len[i];
  85. }
  86. params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  87. bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
  88. os_memset(wpa_s->bssid, 0, ETH_ALEN);
  89. os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
  90. if (bssid_changed)
  91. wpas_notify_bssid_changed(wpa_s);
  92. if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
  93. wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
  94. (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
  95. WPA_KEY_MGMT_FT_IEEE8021X |
  96. WPA_KEY_MGMT_FT_PSK |
  97. WPA_KEY_MGMT_IEEE8021X_SHA256 |
  98. WPA_KEY_MGMT_PSK_SHA256))) {
  99. int try_opportunistic;
  100. try_opportunistic = ssid->proactive_key_caching &&
  101. (ssid->proto & WPA_PROTO_RSN);
  102. if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
  103. wpa_s->current_ssid,
  104. try_opportunistic) == 0)
  105. eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
  106. wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
  107. if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
  108. wpa_s->sme.assoc_req_ie,
  109. &wpa_s->sme.assoc_req_ie_len)) {
  110. wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
  111. "management and encryption suites");
  112. return;
  113. }
  114. } else if (ssid->key_mgmt &
  115. (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
  116. WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
  117. WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
  118. WPA_KEY_MGMT_IEEE8021X_SHA256)) {
  119. wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
  120. if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
  121. wpa_s->sme.assoc_req_ie,
  122. &wpa_s->sme.assoc_req_ie_len)) {
  123. wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
  124. "management and encryption suites (no scan "
  125. "results)");
  126. return;
  127. }
  128. #ifdef CONFIG_WPS
  129. } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
  130. struct wpabuf *wps_ie;
  131. wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
  132. if (wps_ie && wpabuf_len(wps_ie) <=
  133. sizeof(wpa_s->sme.assoc_req_ie)) {
  134. wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
  135. os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
  136. wpa_s->sme.assoc_req_ie_len);
  137. } else
  138. wpa_s->sme.assoc_req_ie_len = 0;
  139. wpabuf_free(wps_ie);
  140. wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
  141. #endif /* CONFIG_WPS */
  142. } else {
  143. wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
  144. wpa_s->sme.assoc_req_ie_len = 0;
  145. }
  146. #ifdef CONFIG_IEEE80211R
  147. ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
  148. if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
  149. md = ie + 2;
  150. wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
  151. if (md) {
  152. /* Prepare for the next transition */
  153. wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
  154. }
  155. if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
  156. WPA_KEY_MGMT_FT_IEEE8021X)) {
  157. if (wpa_s->sme.assoc_req_ie_len + 5 <
  158. sizeof(wpa_s->sme.assoc_req_ie)) {
  159. struct rsn_mdie *mdie;
  160. u8 *pos = wpa_s->sme.assoc_req_ie +
  161. wpa_s->sme.assoc_req_ie_len;
  162. *pos++ = WLAN_EID_MOBILITY_DOMAIN;
  163. *pos++ = sizeof(*mdie);
  164. mdie = (struct rsn_mdie *) pos;
  165. os_memcpy(mdie->mobility_domain, md,
  166. MOBILITY_DOMAIN_ID_LEN);
  167. mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
  168. wpa_s->sme.assoc_req_ie_len += 5;
  169. }
  170. if (wpa_s->sme.ft_used &&
  171. os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
  172. wpa_sm_has_ptk(wpa_s->wpa)) {
  173. wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
  174. "over-the-air");
  175. params.auth_alg = WPA_AUTH_ALG_FT;
  176. params.ie = wpa_s->sme.ft_ies;
  177. params.ie_len = wpa_s->sme.ft_ies_len;
  178. }
  179. }
  180. #endif /* CONFIG_IEEE80211R */
  181. #ifdef CONFIG_IEEE80211W
  182. wpa_s->sme.mfp = ssid->ieee80211w;
  183. if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
  184. const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
  185. struct wpa_ie_data _ie;
  186. if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
  187. _ie.capabilities &
  188. (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
  189. wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
  190. "require MFP");
  191. wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
  192. }
  193. }
  194. #endif /* CONFIG_IEEE80211W */
  195. #ifdef CONFIG_P2P
  196. if (wpa_s->global->p2p) {
  197. u8 *pos;
  198. size_t len;
  199. int res;
  200. int p2p_group;
  201. p2p_group = wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE;
  202. pos = wpa_s->sme.assoc_req_ie + wpa_s->sme.assoc_req_ie_len;
  203. len = sizeof(wpa_s->sme.assoc_req_ie) -
  204. wpa_s->sme.assoc_req_ie_len;
  205. res = wpas_p2p_assoc_req_ie(wpa_s, bss, pos, len, p2p_group);
  206. if (res >= 0)
  207. wpa_s->sme.assoc_req_ie_len += res;
  208. }
  209. #endif /* CONFIG_P2P */
  210. wpa_supplicant_cancel_scan(wpa_s);
  211. wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
  212. " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
  213. wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
  214. wpa_clear_keys(wpa_s, bss->bssid);
  215. wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
  216. old_ssid = wpa_s->current_ssid;
  217. wpa_s->current_ssid = ssid;
  218. wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
  219. wpa_supplicant_initiate_eapol(wpa_s);
  220. if (old_ssid != wpa_s->current_ssid)
  221. wpas_notify_network_changed(wpa_s);
  222. wpa_s->sme.auth_alg = params.auth_alg;
  223. if (wpa_drv_authenticate(wpa_s, &params) < 0) {
  224. wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
  225. "driver failed");
  226. wpa_supplicant_req_scan(wpa_s, 1, 0);
  227. return;
  228. }
  229. /* TODO: add timeout on authentication */
  230. /*
  231. * Association will be started based on the authentication event from
  232. * the driver.
  233. */
  234. }
  235. void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
  236. {
  237. struct wpa_ssid *ssid = wpa_s->current_ssid;
  238. if (ssid == NULL) {
  239. wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
  240. "network is not selected");
  241. return;
  242. }
  243. if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
  244. wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
  245. "not in authenticating state");
  246. return;
  247. }
  248. if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
  249. wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
  250. "unexpected peer " MACSTR,
  251. MAC2STR(data->auth.peer));
  252. return;
  253. }
  254. wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
  255. " auth_type=%d status_code=%d",
  256. MAC2STR(data->auth.peer), data->auth.auth_type,
  257. data->auth.status_code);
  258. wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
  259. data->auth.ies, data->auth.ies_len);
  260. if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
  261. wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
  262. "code %d)", data->auth.status_code);
  263. if (data->auth.status_code !=
  264. WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG ||
  265. wpa_s->sme.auth_alg == data->auth.auth_type ||
  266. wpa_s->current_ssid->auth_alg == WPA_AUTH_ALG_LEAP) {
  267. wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
  268. return;
  269. }
  270. switch (data->auth.auth_type) {
  271. case WLAN_AUTH_OPEN:
  272. wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_SHARED;
  273. wpa_printf(MSG_DEBUG, "SME: Trying SHARED auth");
  274. wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
  275. wpa_s->current_ssid);
  276. return;
  277. case WLAN_AUTH_SHARED_KEY:
  278. wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_LEAP;
  279. wpa_printf(MSG_DEBUG, "SME: Trying LEAP auth");
  280. wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
  281. wpa_s->current_ssid);
  282. return;
  283. default:
  284. return;
  285. }
  286. }
  287. #ifdef CONFIG_IEEE80211R
  288. if (data->auth.auth_type == WLAN_AUTH_FT) {
  289. union wpa_event_data edata;
  290. os_memset(&edata, 0, sizeof(edata));
  291. edata.ft_ies.ies = data->auth.ies;
  292. edata.ft_ies.ies_len = data->auth.ies_len;
  293. os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
  294. wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
  295. }
  296. #endif /* CONFIG_IEEE80211R */
  297. sme_associate(wpa_s, ssid->mode, data->auth.peer,
  298. data->auth.auth_type);
  299. }
  300. void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
  301. const u8 *bssid, u16 auth_type)
  302. {
  303. struct wpa_driver_associate_params params;
  304. struct ieee802_11_elems elems;
  305. os_memset(&params, 0, sizeof(params));
  306. params.bssid = bssid;
  307. params.ssid = wpa_s->sme.ssid;
  308. params.ssid_len = wpa_s->sme.ssid_len;
  309. params.freq = wpa_s->sme.freq;
  310. params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
  311. wpa_s->sme.assoc_req_ie : NULL;
  312. params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
  313. params.pairwise_suite = cipher_suite2driver(wpa_s->pairwise_cipher);
  314. params.group_suite = cipher_suite2driver(wpa_s->group_cipher);
  315. #ifdef CONFIG_IEEE80211R
  316. if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
  317. params.wpa_ie = wpa_s->sme.ft_ies;
  318. params.wpa_ie_len = wpa_s->sme.ft_ies_len;
  319. }
  320. #endif /* CONFIG_IEEE80211R */
  321. params.mode = mode;
  322. params.mgmt_frame_protection = wpa_s->sme.mfp;
  323. if (wpa_s->sme.prev_bssid_set)
  324. params.prev_bssid = wpa_s->sme.prev_bssid;
  325. wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
  326. " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
  327. params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
  328. params.freq);
  329. wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
  330. if (params.wpa_ie == NULL ||
  331. ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
  332. < 0) {
  333. wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
  334. os_memset(&elems, 0, sizeof(elems));
  335. }
  336. if (elems.rsn_ie)
  337. wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
  338. elems.rsn_ie_len + 2);
  339. else if (elems.wpa_ie)
  340. wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
  341. elems.wpa_ie_len + 2);
  342. else
  343. wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
  344. if (elems.p2p &&
  345. (wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE))
  346. params.p2p = 1;
  347. if (wpa_s->parent->set_sta_uapsd)
  348. params.uapsd = wpa_s->parent->sta_uapsd;
  349. else
  350. params.uapsd = -1;
  351. if (wpa_drv_associate(wpa_s, &params) < 0) {
  352. wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
  353. "failed");
  354. wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
  355. os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
  356. return;
  357. }
  358. /* TODO: add timeout on association */
  359. }
  360. int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
  361. const u8 *ies, size_t ies_len)
  362. {
  363. if (md == NULL || ies == NULL) {
  364. wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
  365. os_free(wpa_s->sme.ft_ies);
  366. wpa_s->sme.ft_ies = NULL;
  367. wpa_s->sme.ft_ies_len = 0;
  368. wpa_s->sme.ft_used = 0;
  369. return 0;
  370. }
  371. os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
  372. wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
  373. os_free(wpa_s->sme.ft_ies);
  374. wpa_s->sme.ft_ies = os_malloc(ies_len);
  375. if (wpa_s->sme.ft_ies == NULL)
  376. return -1;
  377. os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
  378. wpa_s->sme.ft_ies_len = ies_len;
  379. return 0;
  380. }
  381. void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
  382. union wpa_event_data *data)
  383. {
  384. int bssid_changed;
  385. wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
  386. "status code %d", MAC2STR(wpa_s->pending_bssid),
  387. data->assoc_reject.status_code);
  388. bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
  389. /*
  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.
  395. */
  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");
  400. }
  401. wpa_s->sme.prev_bssid_set = 0;
  402. wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
  403. wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
  404. os_memset(wpa_s->bssid, 0, ETH_ALEN);
  405. os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
  406. if (bssid_changed)
  407. wpas_notify_bssid_changed(wpa_s);
  408. }
  409. void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
  410. union wpa_event_data *data)
  411. {
  412. wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
  413. wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
  414. }
  415. void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
  416. union wpa_event_data *data)
  417. {
  418. wpa_printf(MSG_DEBUG, "SME: Association timed out");
  419. wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
  420. wpa_supplicant_mark_disassoc(wpa_s);
  421. }
  422. void sme_event_disassoc(struct wpa_supplicant *wpa_s,
  423. union wpa_event_data *data)
  424. {
  425. wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
  426. if (wpa_s->sme.prev_bssid_set &&
  427. !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
  428. /*
  429. * cfg80211/mac80211 can get into somewhat confused state if
  430. * the AP only disassociates us and leaves us in authenticated
  431. * state. For now, force the state to be cleared to avoid
  432. * confusing errors if we try to associate with the AP again.
  433. */
  434. wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
  435. "state");
  436. wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
  437. WLAN_REASON_DEAUTH_LEAVING);
  438. }
  439. }