wpa_supplicant/sme.c

   1 /*
   2  * wpa_supplicant - SME
   3  * Copyright (c) 2009, 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
  15 #include "includes.h"
  16
  17 #include "common.h"
  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"
  23 #include "config.h"
  24 #include "wpa_supplicant_i.h"
  25 #include "driver_i.h"
  26 #include "wpas_glue.h"
  27 #include "wps_supplicant.h"
  28 #include "notify.h"
  29 #include "blacklist.h"
  30 #include "bss.h"
  31 #include "scan.h"
  32 #include "sme.h"
  33
  34 void sme_authenticate(struct wpa_supplicant *wpa_s,
  35                       struct wpa_bss *bss, struct wpa_ssid *ssid)
  36 {
  37         struct wpa_driver_auth_params params;
  38         struct wpa_ssid *old_ssid;
  39 #ifdef CONFIG_IEEE80211R
  40         const u8 *ie;
  41 #endif /* CONFIG_IEEE80211R */
  42 #ifdef CONFIG_IEEE80211R
  43         const u8 *md = NULL;
  44 #endif /* CONFIG_IEEE80211R */
  45         int i, bssid_changed;
  46
  47         if (bss == NULL) {
  48                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  49                            "network");
  50                 return;
  51         }
  52
  53         wpa_s->current_bss = bss;
  54
  55         os_memset(&params, 0, sizeof(params));
  56         wpa_s->reassociate = 0;
  57
  58         params.freq = bss->freq;
  59         params.bssid = bss->bssid;
  60         params.ssid = bss->ssid;
  61         params.ssid_len = bss->ssid_len;
  62
  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;
  66
  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;
  70
  71         params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
  72 #ifdef IEEE8021X_EAPOL
  73         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  74                 if (ssid->leap) {
  75                         if (ssid->non_leap == 0)
  76                                 params.auth_alg = AUTH_ALG_LEAP;
  77                         else
  78                                 params.auth_alg |= AUTH_ALG_LEAP;
  79                 }
  80         }
  81 #endif /* IEEE8021X_EAPOL */
  82         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  83                    params.auth_alg);
  84         if (ssid->auth_alg) {
  85                 params.auth_alg = 0;
  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",
  93                            params.auth_alg);
  94         }
  95
  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];
 100         }
 101         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
 102
 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);
 106         if (bssid_changed)
 107                 wpas_notify_bssid_changed(wpa_s);
 108
 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,
 120                                             wpa_s->current_ssid,
 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");
 129                         return;
 130                 }
 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 "
 142                                    "results)");
 143                         return;
 144                 }
 145 #ifdef CONFIG_WPS
 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);
 154                 } else
 155                         wpa_s->sme.assoc_req_ie_len = 0;
 156                 wpabuf_free(wps_ie);
 157                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 158 #endif /* CONFIG_WPS */
 159         } else {
 160                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 161                 wpa_s->sme.assoc_req_ie_len = 0;
 162         }
 163
 164 #ifdef CONFIG_IEEE80211R
 165         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 166         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 167                 md = ie + 2;
 168         wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
 169         if (md) {
 170                 /* Prepare for the next transition */
 171                 wpa_ft_prepare_auth_request(wpa_s->wpa);
 172         }
 173
 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);
 186                         mdie->ft_capab = 0;
 187                         wpa_s->sme.assoc_req_ie_len += 5;
 188                 }
 189
 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 "
 193                                    "over-the-air");
 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;
 197                 }
 198         }
 199 #endif /* CONFIG_IEEE80211R */
 200
 201 #ifdef CONFIG_IEEE80211W
 202         wpa_s->sme.mfp = ssid->ieee80211w;
 203         if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION && bss) {
 204                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
 205                 struct wpa_ie_data _ie;
 206                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 207                     _ie.capabilities &
 208                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 209                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 210                                    "require MFP");
 211                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 212                 }
 213         }
 214 #endif /* CONFIG_IEEE80211W */
 215
 216         wpa_supplicant_cancel_scan(wpa_s);
 217
 218         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 219                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 220                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 221
 222         wpa_clear_keys(wpa_s, bss->bssid);
 223         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 224         old_ssid = wpa_s->current_ssid;
 225         wpa_s->current_ssid = ssid;
 226         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 227         wpa_supplicant_initiate_eapol(wpa_s);
 228         if (old_ssid != wpa_s->current_ssid)
 229                 wpas_notify_network_changed(wpa_s);
 230
 231         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 232                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 233                         "driver failed");
 234                 return;
 235         }
 236
 237         /* TODO: add timeout on authentication */
 238
 239         /*
 240          * Association will be started based on the authentication event from
 241          * the driver.
 242          */
 243 }
 244
 245
 246 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 247 {
 248         struct wpa_driver_associate_params params;
 249         struct wpa_ssid *ssid = wpa_s->current_ssid;
 250
 251         if (ssid == NULL) {
 252                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 253                            "network is not selected");
 254                 return;
 255         }
 256
 257         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 258                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 259                            "not in authenticating state");
 260                 return;
 261         }
 262
 263         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 264                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 265                            "unexpected peer " MACSTR,
 266                            MAC2STR(data->auth.peer));
 267                 return;
 268         }
 269
 270         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 271                    " auth_type=%d status_code=%d",
 272                    MAC2STR(data->auth.peer), data->auth.auth_type,
 273                    data->auth.status_code);
 274         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 275                     data->auth.ies, data->auth.ies_len);
 276
 277         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 278                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 279                            "code %d)", data->auth.status_code);
 280                 return;
 281         }
 282
 283 #ifdef CONFIG_IEEE80211R
 284         if (data->auth.auth_type == WLAN_AUTH_FT) {
 285                 union wpa_event_data edata;
 286                 os_memset(&edata, 0, sizeof(edata));
 287                 edata.ft_ies.ies = data->auth.ies;
 288                 edata.ft_ies.ies_len = data->auth.ies_len;
 289                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 290                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 291         }
 292 #endif /* CONFIG_IEEE80211R */
 293
 294         os_memset(&params, 0, sizeof(params));
 295         params.bssid = data->auth.peer;
 296         params.ssid = wpa_s->sme.ssid;
 297         params.ssid_len = wpa_s->sme.ssid_len;
 298         params.freq = wpa_s->sme.freq;
 299         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 300                 wpa_s->sme.assoc_req_ie : NULL;
 301         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 302 #ifdef CONFIG_IEEE80211R
 303         if (data->auth.auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 304                 params.wpa_ie = wpa_s->sme.ft_ies;
 305                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 306         }
 307 #endif /* CONFIG_IEEE80211R */
 308         params.mode = ssid->mode;
 309         params.mgmt_frame_protection = wpa_s->sme.mfp;
 310         if (wpa_s->sme.prev_bssid_set)
 311                 params.prev_bssid = wpa_s->sme.prev_bssid;
 312
 313         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 314                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 315                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 316                 params.freq);
 317
 318         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 319
 320         if (wpa_drv_associate(wpa_s, &params) < 0) {
 321                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 322                         "failed");
 323                 return;
 324         }
 325
 326         /* TODO: add timeout on association */
 327 }
 328
 329
 330 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 331                       const u8 *ies, size_t ies_len)
 332 {
 333         if (md == NULL || ies == NULL) {
 334                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 335                 os_free(wpa_s->sme.ft_ies);
 336                 wpa_s->sme.ft_ies = NULL;
 337                 wpa_s->sme.ft_ies_len = 0;
 338                 wpa_s->sme.ft_used = 0;
 339                 return 0;
 340         }
 341
 342         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 343         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 344         os_free(wpa_s->sme.ft_ies);
 345         wpa_s->sme.ft_ies = os_malloc(ies_len);
 346         if (wpa_s->sme.ft_ies == NULL)
 347                 return -1;
 348         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 349         wpa_s->sme.ft_ies_len = ies_len;
 350         return 0;
 351 }
 352
 353
 354 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 355                             union wpa_event_data *data)
 356 {
 357         int bssid_changed;
 358         int timeout = 5000;
 359
 360         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 361                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 362                    data->assoc_reject.status_code);
 363
 364         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 365
 366         /*
 367          * For now, unconditionally terminate the previous authentication. In
 368          * theory, this should not be needed, but mac80211 gets quite confused
 369          * if the authentication is left pending.. Some roaming cases might
 370          * benefit from using the previous authentication, so this could be
 371          * optimized in the future.
 372          */
 373         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 374                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 375                 wpa_msg(wpa_s, MSG_INFO,
 376                         "Deauth request to the driver failed");
 377         }
 378         wpa_s->sme.prev_bssid_set = 0;
 379
 380         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
 381                 struct wpa_blacklist *b;
 382                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
 383                 if (b && b->count < 3) {
 384                         /*
 385                          * Speed up next attempt if there could be other APs
 386                          * that could accept association.
 387                          */
 388                         timeout = 100;
 389                 }
 390         }
 391         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 392         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 393         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 394         if (bssid_changed)
 395                 wpas_notify_bssid_changed(wpa_s);
 396
 397         /*
 398          * TODO: if more than one possible AP is available in scan results,
 399          * could try the other ones before requesting a new scan.
 400          */
 401         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 402                                 1000 * (timeout % 1000));
 403 }
 404
 405
 406 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 407                               union wpa_event_data *data)
 408 {
 409         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 410         wpa_supplicant_req_scan(wpa_s, 5, 0);
 411 }
 412
 413
 414 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 415                                union wpa_event_data *data)
 416 {
 417         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 418         wpa_supplicant_mark_disassoc(wpa_s);
 419         wpa_supplicant_req_scan(wpa_s, 5, 0);
 420 }
 421
 422
 423 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 424                         union wpa_event_data *data)
 425 {
 426         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
 427         if (!is_zero_ether_addr(wpa_s->bssid) &&
 428             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 429                 /*
 430                  * cfg80211/mac80211 can get into somewhat confused state if
 431                  * the AP only disassociates us and leaves us in authenticated
 432                  * state. For now, force the state to be cleared to avoid
 433                  * confusing errors if we try to associate with the AP again.
 434                  */
 435                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 436                            "state");
 437                 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
 438                                        WLAN_REASON_DEAUTH_LEAVING);
 439         }
 440 }