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 "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 = WPA_AUTH_ALG_OPEN;
  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 = WPA_AUTH_ALG_LEAP;
  77                         else
  78                                 params.auth_alg |= WPA_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 = ssid->auth_alg;
  86                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  87                            params.auth_alg);
  88         }
  89
  90         for (i = 0; i < NUM_WEP_KEYS; i++) {
  91                 if (ssid->wep_key_len[i])
  92                         params.wep_key[i] = ssid->wep_key[i];
  93                 params.wep_key_len[i] = ssid->wep_key_len[i];
  94         }
  95         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  96
  97         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
  98         os_memset(wpa_s->bssid, 0, ETH_ALEN);
  99         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
 100         if (bssid_changed)
 101                 wpas_notify_bssid_changed(wpa_s);
 102
 103         if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 104              wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
 105             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 106                                WPA_KEY_MGMT_FT_IEEE8021X |
 107                                WPA_KEY_MGMT_FT_PSK |
 108                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
 109                                WPA_KEY_MGMT_PSK_SHA256))) {
 110                 int try_opportunistic;
 111                 try_opportunistic = ssid->proactive_key_caching &&
 112                         (ssid->proto & WPA_PROTO_RSN);
 113                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
 114                                             wpa_s->current_ssid,
 115                                             try_opportunistic) == 0)
 116                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 117                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 118                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
 119                                               wpa_s->sme.assoc_req_ie,
 120                                               &wpa_s->sme.assoc_req_ie_len)) {
 121                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 122                                    "management and encryption suites");
 123                         return;
 124                 }
 125         } else if (ssid->key_mgmt &
 126                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
 127                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
 128                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
 129                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
 130                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 131                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
 132                                               wpa_s->sme.assoc_req_ie,
 133                                               &wpa_s->sme.assoc_req_ie_len)) {
 134                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 135                                    "management and encryption suites (no scan "
 136                                    "results)");
 137                         return;
 138                 }
 139 #ifdef CONFIG_WPS
 140         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 141                 struct wpabuf *wps_ie;
 142                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
 143                 if (wps_ie && wpabuf_len(wps_ie) <=
 144                     sizeof(wpa_s->sme.assoc_req_ie)) {
 145                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
 146                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
 147                                   wpa_s->sme.assoc_req_ie_len);
 148                 } else
 149                         wpa_s->sme.assoc_req_ie_len = 0;
 150                 wpabuf_free(wps_ie);
 151                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 152 #endif /* CONFIG_WPS */
 153         } else {
 154                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 155                 wpa_s->sme.assoc_req_ie_len = 0;
 156         }
 157
 158 #ifdef CONFIG_IEEE80211R
 159         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 160         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 161                 md = ie + 2;
 162         wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
 163         if (md) {
 164                 /* Prepare for the next transition */
 165                 wpa_ft_prepare_auth_request(wpa_s->wpa);
 166         }
 167
 168         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
 169                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
 170                 if (wpa_s->sme.assoc_req_ie_len + 5 <
 171                     sizeof(wpa_s->sme.assoc_req_ie)) {
 172                         struct rsn_mdie *mdie;
 173                         u8 *pos = wpa_s->sme.assoc_req_ie +
 174                                 wpa_s->sme.assoc_req_ie_len;
 175                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 176                         *pos++ = sizeof(*mdie);
 177                         mdie = (struct rsn_mdie *) pos;
 178                         os_memcpy(mdie->mobility_domain, md,
 179                                   MOBILITY_DOMAIN_ID_LEN);
 180                         mdie->ft_capab = 0;
 181                         wpa_s->sme.assoc_req_ie_len += 5;
 182                 }
 183
 184                 if (wpa_s->sme.ft_used &&
 185                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0) {
 186                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
 187                                    "over-the-air");
 188                         params.auth_alg = WPA_AUTH_ALG_FT;
 189                         params.ie = wpa_s->sme.ft_ies;
 190                         params.ie_len = wpa_s->sme.ft_ies_len;
 191                 }
 192         }
 193 #endif /* CONFIG_IEEE80211R */
 194
 195 #ifdef CONFIG_IEEE80211W
 196         wpa_s->sme.mfp = ssid->ieee80211w;
 197         if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
 198                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
 199                 struct wpa_ie_data _ie;
 200                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 201                     _ie.capabilities &
 202                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 203                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 204                                    "require MFP");
 205                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 206                 }
 207         }
 208 #endif /* CONFIG_IEEE80211W */
 209
 210         wpa_supplicant_cancel_scan(wpa_s);
 211
 212         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 213                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 214                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 215
 216         wpa_clear_keys(wpa_s, bss->bssid);
 217         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 218         old_ssid = wpa_s->current_ssid;
 219         wpa_s->current_ssid = ssid;
 220         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 221         wpa_supplicant_initiate_eapol(wpa_s);
 222         if (old_ssid != wpa_s->current_ssid)
 223                 wpas_notify_network_changed(wpa_s);
 224
 225         wpa_s->sme.auth_alg = params.auth_alg;
 226         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 227                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 228                         "driver failed");
 229                 return;
 230         }
 231
 232         /* TODO: add timeout on authentication */
 233
 234         /*
 235          * Association will be started based on the authentication event from
 236          * the driver.
 237          */
 238 }
 239
 240
 241 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 242 {
 243         struct wpa_ssid *ssid = wpa_s->current_ssid;
 244
 245         if (ssid == NULL) {
 246                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 247                            "network is not selected");
 248                 return;
 249         }
 250
 251         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 252                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 253                            "not in authenticating state");
 254                 return;
 255         }
 256
 257         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 258                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 259                            "unexpected peer " MACSTR,
 260                            MAC2STR(data->auth.peer));
 261                 return;
 262         }
 263
 264         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 265                    " auth_type=%d status_code=%d",
 266                    MAC2STR(data->auth.peer), data->auth.auth_type,
 267                    data->auth.status_code);
 268         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 269                     data->auth.ies, data->auth.ies_len);
 270
 271         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 272                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 273                            "code %d)", data->auth.status_code);
 274                 return;
 275         }
 276
 277 #ifdef CONFIG_IEEE80211R
 278         if (data->auth.auth_type == WLAN_AUTH_FT) {
 279                 union wpa_event_data edata;
 280                 os_memset(&edata, 0, sizeof(edata));
 281                 edata.ft_ies.ies = data->auth.ies;
 282                 edata.ft_ies.ies_len = data->auth.ies_len;
 283                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 284                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 285         }
 286 #endif /* CONFIG_IEEE80211R */
 287
 288         sme_associate(wpa_s, ssid->mode, data->auth.peer,
 289                       data->auth.auth_type);
 290 }
 291
 292
 293 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
 294                    const u8 *bssid, u16 auth_type)
 295 {
 296         struct wpa_driver_associate_params params;
 297
 298         os_memset(&params, 0, sizeof(params));
 299         params.bssid = bssid;
 300         params.ssid = wpa_s->sme.ssid;
 301         params.ssid_len = wpa_s->sme.ssid_len;
 302         params.freq = wpa_s->sme.freq;
 303         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 304                 wpa_s->sme.assoc_req_ie : NULL;
 305         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 306 #ifdef CONFIG_IEEE80211R
 307         if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 308                 params.wpa_ie = wpa_s->sme.ft_ies;
 309                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 310         }
 311 #endif /* CONFIG_IEEE80211R */
 312         params.mode = mode;
 313         params.mgmt_frame_protection = wpa_s->sme.mfp;
 314         if (wpa_s->sme.prev_bssid_set)
 315                 params.prev_bssid = wpa_s->sme.prev_bssid;
 316
 317         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 318                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 319                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 320                 params.freq);
 321
 322         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 323
 324         if (wpa_drv_associate(wpa_s, &params) < 0) {
 325                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 326                         "failed");
 327                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 328                 return;
 329         }
 330
 331         /* TODO: add timeout on association */
 332 }
 333
 334
 335 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 336                       const u8 *ies, size_t ies_len)
 337 {
 338         if (md == NULL || ies == NULL) {
 339                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 340                 os_free(wpa_s->sme.ft_ies);
 341                 wpa_s->sme.ft_ies = NULL;
 342                 wpa_s->sme.ft_ies_len = 0;
 343                 wpa_s->sme.ft_used = 0;
 344                 return 0;
 345         }
 346
 347         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 348         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 349         os_free(wpa_s->sme.ft_ies);
 350         wpa_s->sme.ft_ies = os_malloc(ies_len);
 351         if (wpa_s->sme.ft_ies == NULL)
 352                 return -1;
 353         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 354         wpa_s->sme.ft_ies_len = ies_len;
 355         return 0;
 356 }
 357
 358
 359 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 360                             union wpa_event_data *data)
 361 {
 362         int bssid_changed;
 363         int timeout = 5000;
 364
 365         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 366                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 367                    data->assoc_reject.status_code);
 368
 369         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 370
 371         /*
 372          * For now, unconditionally terminate the previous authentication. In
 373          * theory, this should not be needed, but mac80211 gets quite confused
 374          * if the authentication is left pending.. Some roaming cases might
 375          * benefit from using the previous authentication, so this could be
 376          * optimized in the future.
 377          */
 378         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 379                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 380                 wpa_msg(wpa_s, MSG_INFO,
 381                         "Deauth request to the driver failed");
 382         }
 383         wpa_s->sme.prev_bssid_set = 0;
 384
 385         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
 386                 struct wpa_blacklist *b;
 387                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
 388                 if (b && b->count < 3) {
 389                         /*
 390                          * Speed up next attempt if there could be other APs
 391                          * that could accept association.
 392                          */
 393                         timeout = 100;
 394                 }
 395         }
 396         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 397         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 398         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 399         if (bssid_changed)
 400                 wpas_notify_bssid_changed(wpa_s);
 401
 402         /*
 403          * TODO: if more than one possible AP is available in scan results,
 404          * could try the other ones before requesting a new scan.
 405          */
 406         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 407                                 1000 * (timeout % 1000));
 408 }
 409
 410
 411 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 412                               union wpa_event_data *data)
 413 {
 414         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 415         wpa_supplicant_req_scan(wpa_s, 5, 0);
 416 }
 417
 418
 419 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 420                                union wpa_event_data *data)
 421 {
 422         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 423         wpa_supplicant_mark_disassoc(wpa_s);
 424         wpa_supplicant_req_scan(wpa_s, 5, 0);
 425 }
 426
 427
 428 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 429                         union wpa_event_data *data)
 430 {
 431         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
 432         if (!is_zero_ether_addr(wpa_s->bssid) &&
 433             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 434                 /*
 435                  * cfg80211/mac80211 can get into somewhat confused state if
 436                  * the AP only disassociates us and leaves us in authenticated
 437                  * state. For now, force the state to be cleared to avoid
 438                  * confusing errors if we try to associate with the AP again.
 439                  */
 440                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 441                            "state");
 442                 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
 443                                        WLAN_REASON_DEAUTH_LEAVING);
 444         }
 445 }