wpa_supplicant_node: wpa_supplicant_node: sme.c Source File

00001 /*
00002  * wpa_supplicant - SME
00003  * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License version 2 as
00007  * published by the Free Software Foundation.
00008  *
00009  * Alternatively, this software may be distributed under the terms of BSD
00010  * license.
00011  *
00012  * See README and COPYING for more details.
00013  */
00014 
00015 #include "includes.h"
00016 
00017 #include "common.h"
00018 #include "common/ieee802_11_defs.h"
00019 #include "common/ieee802_11_common.h"
00020 #include "eapol_supp/eapol_supp_sm.h"
00021 #include "common/wpa_common.h"
00022 #include "rsn_supp/wpa.h"
00023 #include "rsn_supp/pmksa_cache.h"
00024 #include "config.h"
00025 #include "wpa_supplicant_i.h"
00026 #include "driver_i.h"
00027 #include "wpas_glue.h"
00028 #include "wps_supplicant.h"
00029 #include "notify.h"
00030 #include "blacklist.h"
00031 #include "bss.h"
00032 #include "scan.h"
00033 #include "sme.h"
00034 
00035 #include "../../src/nodes/wpa_supplicant_node.h"
00036 
00037 void sme_authenticate(struct wpa_supplicant *wpa_s,
00038                       struct wpa_bss *bss, struct wpa_ssid *ssid)
00039 {
00040         struct wpa_driver_auth_params params;
00041         struct wpa_ssid *old_ssid;
00042 #ifdef CONFIG_IEEE80211R
00043         const u8 *ie;
00044 #endif /* CONFIG_IEEE80211R */
00045 #ifdef CONFIG_IEEE80211R
00046         const u8 *md = NULL;
00047 #endif /* CONFIG_IEEE80211R */
00048         int i, bssid_changed;
00049 
00050         if (bss == NULL) {
00051                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
00052                            "network");
00053                 return;
00054         }
00055 
00056         wpa_s->current_bss = bss;
00057 
00058         os_memset(&params, 0, sizeof(params));
00059         wpa_s->reassociate = 0;
00060 
00061         params.freq = bss->freq;
00062         params.bssid = bss->bssid;
00063         params.ssid = bss->ssid;
00064         params.ssid_len = bss->ssid_len;
00065 
00066         if (wpa_s->sme.ssid_len != params.ssid_len ||
00067             os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
00068                 wpa_s->sme.prev_bssid_set = 0;
00069 
00070         wpa_s->sme.freq = params.freq;
00071         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
00072         wpa_s->sme.ssid_len = params.ssid_len;
00073 
00074         params.auth_alg = WPA_AUTH_ALG_OPEN;
00075 #ifdef IEEE8021X_EAPOL
00076         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
00077                 if (ssid->leap) {
00078                         if (ssid->non_leap == 0)
00079                                 params.auth_alg = WPA_AUTH_ALG_LEAP;
00080                         else
00081                                 params.auth_alg |= WPA_AUTH_ALG_LEAP;
00082                 }
00083         }
00084 #endif /* IEEE8021X_EAPOL */
00085         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
00086                    params.auth_alg);
00087         if (ssid->auth_alg) {
00088                 params.auth_alg = ssid->auth_alg;
00089                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
00090                            params.auth_alg);
00091         }
00092 
00093         for (i = 0; i < NUM_WEP_KEYS; i++) {
00094                 if (ssid->wep_key_len[i])
00095                         params.wep_key[i] = ssid->wep_key[i];
00096                 params.wep_key_len[i] = ssid->wep_key_len[i];
00097         }
00098         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
00099 
00100         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
00101         os_memset(wpa_s->bssid, 0, ETH_ALEN);
00102         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
00103         if (bssid_changed)
00104                 wpas_notify_bssid_changed(wpa_s);
00105 
00106         if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
00107              wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
00108             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
00109                                WPA_KEY_MGMT_FT_IEEE8021X |
00110                                WPA_KEY_MGMT_FT_PSK |
00111                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
00112                                WPA_KEY_MGMT_PSK_SHA256))) {
00113                 int try_opportunistic;
00114                 try_opportunistic = ssid->proactive_key_caching &&
00115                         (ssid->proto & WPA_PROTO_RSN);
00116                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
00117                                             wpa_s->current_ssid,
00118                                             try_opportunistic) == 0)
00119                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
00120                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
00121                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
00122                                               wpa_s->sme.assoc_req_ie,
00123                                               &wpa_s->sme.assoc_req_ie_len)) {
00124                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
00125                                    "management and encryption suites");
00126                         return;
00127                 }
00128         } else if (ssid->key_mgmt &
00129                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
00130                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
00131                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
00132                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
00133                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
00134                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
00135                                               wpa_s->sme.assoc_req_ie,
00136                                               &wpa_s->sme.assoc_req_ie_len)) {
00137                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
00138                                    "management and encryption suites (no scan "
00139                                    "results)");
00140                         return;
00141                 }
00142 #ifdef CONFIG_WPS
00143         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
00144                 struct wpabuf *wps_ie;
00145                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
00146                 if (wps_ie && wpabuf_len(wps_ie) <=
00147                     sizeof(wpa_s->sme.assoc_req_ie)) {
00148                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
00149                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
00150                                   wpa_s->sme.assoc_req_ie_len);
00151                 } else
00152                         wpa_s->sme.assoc_req_ie_len = 0;
00153                 wpabuf_free(wps_ie);
00154                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
00155 #endif /* CONFIG_WPS */
00156         } else {
00157                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
00158                 wpa_s->sme.assoc_req_ie_len = 0;
00159         }
00160 
00161 #ifdef CONFIG_IEEE80211R
00162         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
00163         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
00164                 md = ie + 2;
00165         wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
00166         if (md) {
00167                 /* Prepare for the next transition */
00168                 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
00169         }
00170 
00171         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
00172                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
00173                 if (wpa_s->sme.assoc_req_ie_len + 5 <
00174                     sizeof(wpa_s->sme.assoc_req_ie)) {
00175                         struct rsn_mdie *mdie;
00176                         u8 *pos = wpa_s->sme.assoc_req_ie +
00177                                 wpa_s->sme.assoc_req_ie_len;
00178                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
00179                         *pos++ = sizeof(*mdie);
00180                         mdie = (struct rsn_mdie *) pos;
00181                         os_memcpy(mdie->mobility_domain, md,
00182                                   MOBILITY_DOMAIN_ID_LEN);
00183                         mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
00184                         wpa_s->sme.assoc_req_ie_len += 5;
00185                 }
00186 
00187                 if (wpa_s->sme.ft_used &&
00188                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
00189                     wpa_sm_has_ptk(wpa_s->wpa)) {
00190                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
00191                                    "over-the-air");
00192                         params.auth_alg = WPA_AUTH_ALG_FT;
00193                         params.ie = wpa_s->sme.ft_ies;
00194                         params.ie_len = wpa_s->sme.ft_ies_len;
00195                 }
00196         }
00197 #endif /* CONFIG_IEEE80211R */
00198 
00199 #ifdef CONFIG_IEEE80211W
00200         wpa_s->sme.mfp = ssid->ieee80211w;
00201         if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
00202                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
00203                 struct wpa_ie_data _ie;
00204                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
00205                     _ie.capabilities &
00206                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
00207                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
00208                                    "require MFP");
00209                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
00210                 }
00211         }
00212 #endif /* CONFIG_IEEE80211W */
00213 
00214         wpa_supplicant_cancel_scan(wpa_s);
00215 
00216         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
00217                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
00218                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
00219 
00220         wpa_clear_keys(wpa_s, bss->bssid);
00221         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
00222         old_ssid = wpa_s->current_ssid;
00223         wpa_s->current_ssid = ssid;
00224         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
00225         wpa_supplicant_initiate_eapol(wpa_s);
00226         if (old_ssid != wpa_s->current_ssid)
00227                 wpas_notify_network_changed(wpa_s);
00228 
00229         wpa_s->sme.auth_alg = params.auth_alg;
00230         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
00231                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
00232                         "driver failed");
00233                 //wpa_supplicant_req_scan(wpa_s, 0, 200000);
00234                 ros_assoc_failed(wpa_s, bss->bssid, "Driver request to authenticate failed");
00235                 return;
00236         }
00237 
00238         /* TODO: add timeout on authentication */
00239 
00240         /*
00241          * Association will be started based on the authentication event from
00242          * the driver.
00243          */
00244 }
00245 
00246 
00247 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
00248 {
00249         struct wpa_ssid *ssid = wpa_s->current_ssid;
00250 
00251         if (ssid == NULL) {
00252                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
00253                            "network is not selected");
00254                 return;
00255         }
00256 
00257         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
00258                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
00259                            "not in authenticating state");
00260                 return;
00261         }
00262 
00263         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
00264                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
00265                            "unexpected peer " MACSTR,
00266                            MAC2STR(data->auth.peer));
00267                 return;
00268         }
00269 
00270         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
00271                    " auth_type=%d status_code=%d",
00272                    MAC2STR(data->auth.peer), data->auth.auth_type,
00273                    data->auth.status_code);
00274         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
00275                     data->auth.ies, data->auth.ies_len);
00276 
00277         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
00278                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
00279                            "code %d)", data->auth.status_code);
00280                 ros_assoc_failed(wpa_s, data->auth.peer, "Authentication failed");
00281                 return;
00282         }
00283 
00284 #ifdef CONFIG_IEEE80211R
00285         if (data->auth.auth_type == WLAN_AUTH_FT) {
00286                 union wpa_event_data edata;
00287                 os_memset(&edata, 0, sizeof(edata));
00288                 edata.ft_ies.ies = data->auth.ies;
00289                 edata.ft_ies.ies_len = data->auth.ies_len;
00290                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
00291                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
00292         }
00293 #endif /* CONFIG_IEEE80211R */
00294 
00295         sme_associate(wpa_s, ssid->mode, data->auth.peer,
00296                       data->auth.auth_type);
00297 }
00298 
00299 
00300 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
00301                    const u8 *bssid, u16 auth_type)
00302 {
00303         struct wpa_driver_associate_params params;
00304         struct ieee802_11_elems elems;
00305 
00306         os_memset(&params, 0, sizeof(params));
00307         params.bssid = bssid;
00308         params.ssid = wpa_s->sme.ssid;
00309         params.ssid_len = wpa_s->sme.ssid_len;
00310         params.freq = wpa_s->sme.freq;
00311         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
00312                 wpa_s->sme.assoc_req_ie : NULL;
00313         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
00314 #ifdef CONFIG_IEEE80211R
00315         if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
00316                 params.wpa_ie = wpa_s->sme.ft_ies;
00317                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
00318         }
00319 #endif /* CONFIG_IEEE80211R */
00320         params.mode = mode;
00321         params.mgmt_frame_protection = wpa_s->sme.mfp;
00322         if (wpa_s->sme.prev_bssid_set)
00323                 params.prev_bssid = wpa_s->sme.prev_bssid;
00324 
00325         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
00326                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
00327                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
00328                 params.freq);
00329 
00330         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
00331 
00332         if (params.wpa_ie == NULL ||
00333             ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
00334             < 0) {
00335                 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
00336                 os_memset(&elems, 0, sizeof(elems));
00337         }
00338         if (elems.rsn_ie)
00339                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
00340                                         elems.rsn_ie_len + 2);
00341         else if (elems.wpa_ie)
00342                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
00343                                         elems.wpa_ie_len + 2);
00344         else
00345                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
00346 
00347         if (wpa_drv_associate(wpa_s, &params) < 0) {
00348                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
00349                         "failed");
00350                 //wpa_supplicant_req_scan(wpa_s, 5, 0);
00351                 ros_assoc_failed(wpa_s, bssid, "Driver request to associate failed");
00352                 return;
00353         }
00354 
00355         /* TODO: add timeout on association */
00356 }
00357 
00358 
00359 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
00360                       const u8 *ies, size_t ies_len)
00361 {
00362         if (md == NULL || ies == NULL) {
00363                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
00364                 os_free(wpa_s->sme.ft_ies);
00365                 wpa_s->sme.ft_ies = NULL;
00366                 wpa_s->sme.ft_ies_len = 0;
00367                 wpa_s->sme.ft_used = 0;
00368                 return 0;
00369         }
00370 
00371         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
00372         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
00373         os_free(wpa_s->sme.ft_ies);
00374         wpa_s->sme.ft_ies = os_malloc(ies_len);
00375         if (wpa_s->sme.ft_ies == NULL)
00376                 return -1;
00377         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
00378         wpa_s->sme.ft_ies_len = ies_len;
00379         return 0;
00380 }
00381 
00382 
00383 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
00384                             union wpa_event_data *data)
00385 {
00386         int bssid_changed;
00387         int timeout = 5000;
00388 
00389         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
00390                    "status code %d", MAC2STR(wpa_s->pending_bssid),
00391                    data->assoc_reject.status_code);
00392 
00393         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
00394 
00395         /*
00396          * For now, unconditionally terminate the previous authentication. In
00397          * theory, this should not be needed, but mac80211 gets quite confused
00398          * if the authentication is left pending.. Some roaming cases might
00399          * benefit from using the previous authentication, so this could be
00400          * optimized in the future.
00401          */
00402         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
00403                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
00404                 wpa_msg(wpa_s, MSG_INFO,
00405                         "Deauth request to the driver failed");
00406         }
00407         wpa_s->sme.prev_bssid_set = 0;
00408 
00409         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
00410                 struct wpa_blacklist *b;
00411                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
00412                 if (b && b->count < 3) {
00413                         /*
00414                          * Speed up next attempt if there could be other APs
00415                          * that could accept association.
00416                          */
00417                         timeout = 100;
00418                 }
00419         }
00420         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
00421         os_memset(wpa_s->bssid, 0, ETH_ALEN);
00422         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
00423         if (bssid_changed)
00424                 wpas_notify_bssid_changed(wpa_s);
00425 
00426         /*
00427          * TODO: if more than one possible AP is available in scan results,
00428          * could try the other ones before requesting a new scan.
00429          */
00430         ros_assoc_failed(wpa_s, wpa_s->pending_bssid, "Association rejected");
00431         //wpa_supplicant_req_scan(wpa_s, timeout / 1000,
00432         //                      1000 * (timeout % 1000));
00433 }
00434 
00435 
00436 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
00437                               union wpa_event_data *data)
00438 {
00439         int timeout = 5000;
00440         
00441         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
00442         
00443         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
00444                 struct wpa_blacklist *b;
00445                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
00446                 if (b && b->count < 3) {
00447                         /*
00448                          * Speed up next attempt if there could be other APs
00449                          * that could accept association.
00450                          */
00451                         timeout = 100;
00452                 }
00453         }
00454         ros_assoc_failed(wpa_s, wpa_s->pending_bssid, "Authentication timed out");
00455         //wpa_supplicant_req_scan(wpa_s, timeout / 1000,
00456         //                      1000 * (timeout % 1000));
00457 }
00458 
00459 
00460 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
00461                                union wpa_event_data *data)
00462 {
00463         wpa_printf(MSG_DEBUG, "SME: Association timed out");
00464         wpa_supplicant_mark_disassoc(wpa_s);
00465         ros_assoc_failed(wpa_s, wpa_s->pending_bssid, "Association timed out");
00466         //wpa_supplicant_req_scan(wpa_s, 5, 0);
00467 }
00468 
00469 
00470 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
00471                         union wpa_event_data *data)
00472 {
00473         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
00474         if (!is_zero_ether_addr(wpa_s->bssid) &&
00475             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
00476                 /*
00477                  * cfg80211/mac80211 can get into somewhat confused state if
00478                  * the AP only disassociates us and leaves us in authenticated
00479                  * state. For now, force the state to be cleared to avoid
00480                  * confusing errors if we try to associate with the AP again.
00481                  */
00482                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
00483                            "state");
00484                 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
00485                                        WLAN_REASON_DEAUTH_LEAVING);
00486         }
00487 }