contrib/wpa/wpa_supplicant/sme.c

   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
  15 #include "includes.h"
  16
  17 #include "common.h"
  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"
  24 #include "config.h"
  25 #include "wpa_supplicant_i.h"
  26 #include "driver_i.h"
  27 #include "wpas_glue.h"
  28 #include "wps_supplicant.h"
  29 #include "notify.h"
  30 #include "blacklist.h"
  31 #include "bss.h"
  32 #include "scan.h"
  33 #include "sme.h"
  34
  35 void sme_authenticate(struct wpa_supplicant *wpa_s,
  36                       struct wpa_bss *bss, struct wpa_ssid *ssid)
  37 {
  38         struct wpa_driver_auth_params params;
  39         struct wpa_ssid *old_ssid;
  40 #ifdef CONFIG_IEEE80211R
  41         const u8 *ie;
  42 #endif /* CONFIG_IEEE80211R */
  43 #ifdef CONFIG_IEEE80211R
  44         const u8 *md = NULL;
  45 #endif /* CONFIG_IEEE80211R */
  46         int i, bssid_changed;
  47
  48         if (bss == NULL) {
  49                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  50                            "network");
  51                 return;
  52         }
  53
  54         wpa_s->current_bss = bss;
  55
  56         os_memset(&params, 0, sizeof(params));
  57         wpa_s->reassociate = 0;
  58
  59         params.freq = bss->freq;
  60         params.bssid = bss->bssid;
  61         params.ssid = bss->ssid;
  62         params.ssid_len = bss->ssid_len;
  63
  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;
  67
  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;
  71
  72         params.auth_alg = WPA_AUTH_ALG_OPEN;
  73 #ifdef IEEE8021X_EAPOL
  74         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  75                 if (ssid->leap) {
  76                         if (ssid->non_leap == 0)
  77                                 params.auth_alg = WPA_AUTH_ALG_LEAP;
  78                         else
  79                                 params.auth_alg |= WPA_AUTH_ALG_LEAP;
  80                 }
  81         }
  82 #endif /* IEEE8021X_EAPOL */
  83         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  84                    params.auth_alg);
  85         if (ssid->auth_alg) {
  86                 params.auth_alg = ssid->auth_alg;
  87                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  88                            params.auth_alg);
  89         }
  90
  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];
  95         }
  96         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  97
  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);
 101         if (bssid_changed)
 102                 wpas_notify_bssid_changed(wpa_s);
 103
 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,
 115                                             wpa_s->current_ssid,
 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");
 124                         return;
 125                 }
 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 "
 137                                    "results)");
 138                         return;
 139                 }
 140 #ifdef CONFIG_WPS
 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);
 149                 } else
 150                         wpa_s->sme.assoc_req_ie_len = 0;
 151                 wpabuf_free(wps_ie);
 152                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 153 #endif /* CONFIG_WPS */
 154         } else {
 155                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 156                 wpa_s->sme.assoc_req_ie_len = 0;
 157         }
 158
 159 #ifdef CONFIG_IEEE80211R
 160         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 161         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 162                 md = ie + 2;
 163         wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
 164         if (md) {
 165                 /* Prepare for the next transition */
 166                 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
 167         }
 168
 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;
 183                 }
 184
 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 "
 189                                    "over-the-air");
 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;
 193                 }
 194         }
 195 #endif /* CONFIG_IEEE80211R */
 196
 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 &&
 203                     _ie.capabilities &
 204                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 205                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 206                                    "require MFP");
 207                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 208                 }
 209         }
 210 #endif /* CONFIG_IEEE80211W */
 211
 212         wpa_supplicant_cancel_scan(wpa_s);
 213
 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);
 217
 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);
 226
 227         wpa_s->sme.auth_alg = params.auth_alg;
 228         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 229                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 230                         "driver failed");
 231                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 232                 return;
 233         }
 234
 235         /* TODO: add timeout on authentication */
 236
 237         /*
 238          * Association will be started based on the authentication event from
 239          * the driver.
 240          */
 241 }
 242
 243
 244 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 245 {
 246         struct wpa_ssid *ssid = wpa_s->current_ssid;
 247
 248         if (ssid == NULL) {
 249                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 250                            "network is not selected");
 251                 return;
 252         }
 253
 254         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 255                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 256                            "not in authenticating state");
 257                 return;
 258         }
 259
 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));
 264                 return;
 265         }
 266
 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);
 273
 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);
 277
 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)
 282                         return;
 283
 284                 switch (data->auth.auth_type) {
 285                 case WLAN_AUTH_OPEN:
 286                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_SHARED;
 287
 288                         wpa_printf(MSG_DEBUG, "SME: Trying SHARED auth");
 289                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 290                                                  wpa_s->current_ssid);
 291                         return;
 292
 293                 case WLAN_AUTH_SHARED_KEY:
 294                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_LEAP;
 295
 296                         wpa_printf(MSG_DEBUG, "SME: Trying LEAP auth");
 297                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 298                                                  wpa_s->current_ssid);
 299                         return;
 300
 301                 default:
 302                         return;
 303                 }
 304         }
 305
 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);
 314         }
 315 #endif /* CONFIG_IEEE80211R */
 316
 317         sme_associate(wpa_s, ssid->mode, data->auth.peer,
 318                       data->auth.auth_type);
 319 }
 320
 321
 322 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
 323                    const u8 *bssid, u16 auth_type)
 324 {
 325         struct wpa_driver_associate_params params;
 326         struct ieee802_11_elems elems;
 327
 328         os_memset(&params, 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;
 340         }
 341 #endif /* CONFIG_IEEE80211R */
 342         params.mode = mode;
 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;
 346
 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) : "",
 350                 params.freq);
 351
 352         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 353
 354         if (params.wpa_ie == NULL ||
 355             ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
 356             < 0) {
 357                 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
 358                 os_memset(&elems, 0, sizeof(elems));
 359         }
 360         if (elems.rsn_ie)
 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);
 366         else
 367                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 368
 369         if (wpa_drv_associate(wpa_s, &params) < 0) {
 370                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 371                         "failed");
 372                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 373                 return;
 374         }
 375
 376         /* TODO: add timeout on association */
 377 }
 378
 379
 380 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 381                       const u8 *ies, size_t ies_len)
 382 {
 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;
 389                 return 0;
 390         }
 391
 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)
 397                 return -1;
 398         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 399         wpa_s->sme.ft_ies_len = ies_len;
 400         return 0;
 401 }
 402
 403
 404 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 405                             union wpa_event_data *data)
 406 {
 407         int bssid_changed;
 408         int timeout = 5000;
 409
 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);
 413
 414         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 415
 416         /*
 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.
 422          */
 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");
 427         }
 428         wpa_s->sme.prev_bssid_set = 0;
 429
 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) {
 434                         /*
 435                          * Speed up next attempt if there could be other APs
 436                          * that could accept association.
 437                          */
 438                         timeout = 100;
 439                 }
 440         }
 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);
 444         if (bssid_changed)
 445                 wpas_notify_bssid_changed(wpa_s);
 446
 447         /*
 448          * TODO: if more than one possible AP is available in scan results,
 449          * could try the other ones before requesting a new scan.
 450          */
 451         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 452                                 1000 * (timeout % 1000));
 453 }
 454
 455
 456 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 457                               union wpa_event_data *data)
 458 {
 459         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 460         wpa_supplicant_req_scan(wpa_s, 5, 0);
 461 }
 462
 463
 464 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 465                                union wpa_event_data *data)
 466 {
 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);
 470 }
 471
 472
 473 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 474                         union wpa_event_data *data)
 475 {
 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)) {
 479                 /*
 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.
 484                  */
 485                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 486                            "state");
 487                 wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
 488                                        WLAN_REASON_DEAUTH_LEAVING);
 489         }
 490 }