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 "sme.h"
  32
  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         const u8 *ie;
  39 #ifdef CONFIG_IEEE80211R
  40         const u8 *md = NULL;
  41 #endif /* CONFIG_IEEE80211R */
  42         int i, bssid_changed;
  43
  44         if (bss == NULL) {
  45                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  46                            "network");
  47                 return;
  48         }
  49
  50         wpa_s->current_bss = bss;
  51
  52         os_memset(&params, 0, sizeof(params));
  53         wpa_s->reassociate = 0;
  54
  55         params.freq = bss->freq;
  56         params.bssid = bss->bssid;
  57         params.ssid = bss->ssid;
  58         params.ssid_len = bss->ssid_len;
  59
  60         if (wpa_s->sme.ssid_len != params.ssid_len ||
  61             os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
  62                 wpa_s->sme.prev_bssid_set = 0;
  63
  64         wpa_s->sme.freq = params.freq;
  65         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  66         wpa_s->sme.ssid_len = params.ssid_len;
  67
  68         params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
  69 #ifdef IEEE8021X_EAPOL
  70         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  71                 if (ssid->leap) {
  72                         if (ssid->non_leap == 0)
  73                                 params.auth_alg = AUTH_ALG_LEAP;
  74                         else
  75                                 params.auth_alg |= AUTH_ALG_LEAP;
  76                 }
  77         }
  78 #endif /* IEEE8021X_EAPOL */
  79         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  80                    params.auth_alg);
  81         if (ssid->auth_alg) {
  82                 params.auth_alg = 0;
  83                 if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
  84                         params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
  85                 if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
  86                         params.auth_alg |= AUTH_ALG_SHARED_KEY;
  87                 if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
  88                         params.auth_alg |= AUTH_ALG_LEAP;
  89                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  90                            params.auth_alg);
  91         }
  92
  93         for (i = 0; i < NUM_WEP_KEYS; i++) {
  94                 if (ssid->wep_key_len[i])
  95                         params.wep_key[i] = ssid->wep_key[i];
  96                 params.wep_key_len[i] = ssid->wep_key_len[i];
  97         }
  98         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  99
 100         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 101         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 102         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
 103         if (bssid_changed)
 104                 wpas_notify_bssid_changed(wpa_s);
 105
 106         if (bss && (wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 107                     wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
 108             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 109                                WPA_KEY_MGMT_FT_IEEE8021X |
 110                                WPA_KEY_MGMT_FT_PSK |
 111                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
 112                                WPA_KEY_MGMT_PSK_SHA256))) {
 113                 int try_opportunistic;
 114                 try_opportunistic = ssid->proactive_key_caching &&
 115                         (ssid->proto & WPA_PROTO_RSN);
 116                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
 117                                             wpa_s->current_ssid,
 118                                             try_opportunistic) == 0)
 119                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 120                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 121                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
 122                                               wpa_s->sme.assoc_req_ie,
 123                                               &wpa_s->sme.assoc_req_ie_len)) {
 124                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 125                                    "management and encryption suites");
 126                         return;
 127                 }
 128         } else if (ssid->key_mgmt &
 129                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
 130                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
 131                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
 132                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
 133                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 134                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
 135                                               wpa_s->sme.assoc_req_ie,
 136                                               &wpa_s->sme.assoc_req_ie_len)) {
 137                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 138                                    "management and encryption suites (no scan "
 139                                    "results)");
 140                         return;
 141                 }
 142 #ifdef CONFIG_WPS
 143         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 144                 struct wpabuf *wps_ie;
 145                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
 146                 if (wps_ie && wpabuf_len(wps_ie) <=
 147                     sizeof(wpa_s->sme.assoc_req_ie)) {
 148                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
 149                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
 150                                   wpa_s->sme.assoc_req_ie_len);
 151                 } else
 152                         wpa_s->sme.assoc_req_ie_len = 0;
 153                 wpabuf_free(wps_ie);
 154                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 155 #endif /* CONFIG_WPS */
 156         } else {
 157                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 158                 wpa_s->sme.assoc_req_ie_len = 0;
 159         }
 160
 161 #ifdef CONFIG_IEEE80211R
 162         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 163         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 164                 md = ie + 2;
 165         wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
 166         if (md) {
 167                 /* Prepare for the next transition */
 168                 wpa_ft_prepare_auth_request(wpa_s->wpa);
 169         }
 170
 171         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
 172                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
 173                 if (wpa_s->sme.assoc_req_ie_len + 5 <
 174                     sizeof(wpa_s->sme.assoc_req_ie)) {
 175                         struct rsn_mdie *mdie;
 176                         u8 *pos = wpa_s->sme.assoc_req_ie +
 177                                 wpa_s->sme.assoc_req_ie_len;
 178                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 179                         *pos++ = sizeof(*mdie);
 180                         mdie = (struct rsn_mdie *) pos;
 181                         os_memcpy(mdie->mobility_domain, md,
 182                                   MOBILITY_DOMAIN_ID_LEN);
 183                         mdie->ft_capab = 0;
 184                         wpa_s->sme.assoc_req_ie_len += 5;
 185                 }
 186
 187                 if (wpa_s->sme.ft_used &&
 188                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0) {
 189                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
 190                                    "over-the-air");
 191                         params.auth_alg = AUTH_ALG_FT;
 192                         params.ie = wpa_s->sme.ft_ies;
 193                         params.ie_len = wpa_s->sme.ft_ies_len;
 194                 }
 195         }
 196 #endif /* CONFIG_IEEE80211R */
 197
 198 #ifdef CONFIG_IEEE80211W
 199         switch (ssid->ieee80211w) {
 200         case NO_IEEE80211W:
 201                 wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
 202                 break;
 203         case IEEE80211W_OPTIONAL:
 204                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
 205                 break;
 206         case IEEE80211W_REQUIRED:
 207                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 208                 break;
 209         }
 210         if (ssid->ieee80211w != NO_IEEE80211W && bss) {
 211                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
 212                 struct wpa_ie_data _ie;
 213                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 214                     _ie.capabilities &
 215                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 216                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 217                                    "require MFP");
 218                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 219                 }
 220         }
 221 #endif /* CONFIG_IEEE80211W */
 222
 223         wpa_supplicant_cancel_scan(wpa_s);
 224
 225         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 226                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 227                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 228
 229         wpa_clear_keys(wpa_s, bss->bssid);
 230         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 231         old_ssid = wpa_s->current_ssid;
 232         wpa_s->current_ssid = ssid;
 233         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 234         wpa_supplicant_initiate_eapol(wpa_s);
 235         if (old_ssid != wpa_s->current_ssid)
 236                 wpas_notify_network_changed(wpa_s);
 237
 238         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 239                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 240                         "driver failed");
 241                 return;
 242         }
 243
 244         /* TODO: add timeout on authentication */
 245
 246         /*
 247          * Association will be started based on the authentication event from
 248          * the driver.
 249          */
 250 }
 251
 252
 253 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 254 {
 255         struct wpa_driver_associate_params params;
 256         struct wpa_ssid *ssid = wpa_s->current_ssid;
 257
 258         if (ssid == NULL) {
 259                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 260                            "network is not selected");
 261                 return;
 262         }
 263
 264         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 265                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 266                            "not in authenticating state");
 267                 return;
 268         }
 269
 270         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 271                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 272                            "unexpected peer " MACSTR,
 273                            MAC2STR(data->auth.peer));
 274                 return;
 275         }
 276
 277         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 278                    " auth_type=%d status_code=%d",
 279                    MAC2STR(data->auth.peer), data->auth.auth_type,
 280                    data->auth.status_code);
 281         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 282                     data->auth.ies, data->auth.ies_len);
 283
 284         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 285                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 286                            "code %d)", data->auth.status_code);
 287                 return;
 288         }
 289
 290 #ifdef CONFIG_IEEE80211R
 291         if (data->auth.auth_type == WLAN_AUTH_FT) {
 292                 union wpa_event_data edata;
 293                 os_memset(&edata, 0, sizeof(edata));
 294                 edata.ft_ies.ies = data->auth.ies;
 295                 edata.ft_ies.ies_len = data->auth.ies_len;
 296                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 297                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 298         }
 299 #endif /* CONFIG_IEEE80211R */
 300
 301         os_memset(&params, 0, sizeof(params));
 302         params.bssid = data->auth.peer;
 303         params.ssid = wpa_s->sme.ssid;
 304         params.ssid_len = wpa_s->sme.ssid_len;
 305         params.freq = wpa_s->sme.freq;
 306         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 307                 wpa_s->sme.assoc_req_ie : NULL;
 308         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 309 #ifdef CONFIG_IEEE80211R
 310         if (data->auth.auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 311                 params.wpa_ie = wpa_s->sme.ft_ies;
 312                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 313         }
 314 #endif /* CONFIG_IEEE80211R */
 315         params.mode = ssid->mode;
 316         params.mgmt_frame_protection = wpa_s->sme.mfp;
 317         if (wpa_s->sme.prev_bssid_set)
 318                 params.prev_bssid = wpa_s->sme.prev_bssid;
 319
 320         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 321                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 322                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 323                 params.freq);
 324
 325         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 326
 327         if (wpa_drv_associate(wpa_s, &params) < 0) {
 328                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 329                         "failed");
 330                 return;
 331         }
 332
 333         /* TODO: add timeout on association */
 334 }
 335
 336
 337 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 338                       const u8 *ies, size_t ies_len)
 339 {
 340         if (md == NULL || ies == NULL) {
 341                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 342                 os_free(wpa_s->sme.ft_ies);
 343                 wpa_s->sme.ft_ies = NULL;
 344                 wpa_s->sme.ft_ies_len = 0;
 345                 wpa_s->sme.ft_used = 0;
 346                 return 0;
 347         }
 348
 349         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 350         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 351         os_free(wpa_s->sme.ft_ies);
 352         wpa_s->sme.ft_ies = os_malloc(ies_len);
 353         if (wpa_s->sme.ft_ies == NULL)
 354                 return -1;
 355         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 356         wpa_s->sme.ft_ies_len = ies_len;
 357         return 0;
 358 }
 359
 360
 361 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 362                             union wpa_event_data *data)
 363 {
 364         int bssid_changed;
 365         int timeout = 5000;
 366
 367         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 368                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 369                    data->assoc_reject.status_code);
 370
 371         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 372
 373         /*
 374          * For now, unconditionally terminate the previous authentication. In
 375          * theory, this should not be needed, but mac80211 gets quite confused
 376          * if the authentication is left pending.. Some roaming cases might
 377          * benefit from using the previous authentication, so this could be
 378          * optimized in the future.
 379          */
 380         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 381                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 382                 wpa_msg(wpa_s, MSG_INFO,
 383                         "Deauth request to the driver failed");
 384         }
 385         wpa_s->sme.prev_bssid_set = 0;
 386
 387         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
 388                 struct wpa_blacklist *b;
 389                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
 390                 if (b && b->count < 3) {
 391                         /*
 392                          * Speed up next attempt if there could be other APs
 393                          * that could accept association.
 394                          */
 395                         timeout = 100;
 396                 }
 397         }
 398         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 399         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 400         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 401         if (bssid_changed)
 402                 wpas_notify_bssid_changed(wpa_s);
 403
 404         /*
 405          * TODO: if more than one possible AP is available in scan results,
 406          * could try the other ones before requesting a new scan.
 407          */
 408         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 409                                 1000 * (timeout % 1000));
 410 }
 411
 412
 413 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 414                               union wpa_event_data *data)
 415 {
 416         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 417         wpa_supplicant_req_scan(wpa_s, 5, 0);
 418 }
 419
 420
 421 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 422                                union wpa_event_data *data)
 423 {
 424         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 425         wpa_supplicant_mark_disassoc(wpa_s);
 426         wpa_supplicant_req_scan(wpa_s, 5, 0);
 427 }
 428
 429
 430 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 431                         union wpa_event_data *data)
 432 {
 433         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
 434         if (!is_zero_ether_addr(wpa_s->bssid) &&
 435             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 436                 /*
 437                  * cfg80211/mac80211 can get into somewhat confused state if
 438                  * the AP only disassociates us and leaves us in authenticated
 439                  * state. For now, force the state to be cleared to avoid
 440                  * confusing errors if we try to associate with the AP again.
 441                  */
 442                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 443                            "state");
 444                 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
 445                                        WLAN_REASON_DEAUTH_LEAVING);
 446         }
 447 }