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 "ieee802_11_defs.h"
  19 #include "eapol_supp/eapol_supp_sm.h"
  20 #include "wpa_common.h"
  21 #include "wpa.h"
  22 #include "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 "sme.h"
  31
  32 void sme_authenticate(struct wpa_supplicant *wpa_s,
  33                       struct wpa_scan_res *bss, struct wpa_ssid *ssid)
  34 {
  35         struct wpa_driver_auth_params params;
  36         struct wpa_ssid *old_ssid;
  37         const u8 *ie;
  38 #ifdef CONFIG_IEEE80211R
  39         const u8 *md = NULL;
  40 #endif /* CONFIG_IEEE80211R */
  41         int i, bssid_changed;
  42
  43         if (bss == NULL) {
  44                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  45                            "network");
  46                 return;
  47         }
  48
  49         os_memset(&params, 0, sizeof(params));
  50         wpa_s->reassociate = 0;
  51
  52         params.freq = bss->freq;
  53         params.bssid = bss->bssid;
  54         ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
  55         if (ie == NULL) {
  56                 wpa_printf(MSG_ERROR, "SME: SSID not available for the BSS");
  57                 return;
  58         }
  59         params.ssid = ie + 2;
  60         params.ssid_len = ie[1];
  61
  62         wpa_s->sme.freq = params.freq;
  63         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  64         wpa_s->sme.ssid_len = params.ssid_len;
  65
  66         params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
  67 #ifdef IEEE8021X_EAPOL
  68         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  69                 if (ssid->leap) {
  70                         if (ssid->non_leap == 0)
  71                                 params.auth_alg = AUTH_ALG_LEAP;
  72                         else
  73                                 params.auth_alg |= AUTH_ALG_LEAP;
  74                 }
  75         }
  76 #endif /* IEEE8021X_EAPOL */
  77         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  78                    params.auth_alg);
  79         if (ssid->auth_alg) {
  80                 params.auth_alg = 0;
  81                 if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
  82                         params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
  83                 if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
  84                         params.auth_alg |= AUTH_ALG_SHARED_KEY;
  85                 if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
  86                         params.auth_alg |= AUTH_ALG_LEAP;
  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 (bss && (wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 105                     wpa_scan_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_scan_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, md, NULL, 0, NULL);
 164         if (md) {
 165                 /* Prepare for the next transition */
 166                 wpa_ft_prepare_auth_request(wpa_s->wpa);
 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 = 0;
 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_printf(MSG_DEBUG, "SME: Trying to use FT "
 188                                    "over-the-air");
 189                         params.auth_alg = AUTH_ALG_FT;
 190                         params.ie = wpa_s->sme.ft_ies;
 191                         params.ie_len = wpa_s->sme.ft_ies_len;
 192                 }
 193         }
 194 #endif /* CONFIG_IEEE80211R */
 195
 196 #ifdef CONFIG_IEEE80211W
 197         switch (ssid->ieee80211w) {
 198         case NO_IEEE80211W:
 199                 wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
 200                 break;
 201         case IEEE80211W_OPTIONAL:
 202                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
 203                 break;
 204         case IEEE80211W_REQUIRED:
 205                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 206                 break;
 207         }
 208         if (ssid->ieee80211w != NO_IEEE80211W && bss) {
 209                 const u8 *rsn = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 210                 struct wpa_ie_data _ie;
 211                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 212                     _ie.capabilities &
 213                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 214                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 215                                    "require MFP");
 216                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 217                 }
 218         }
 219 #endif /* CONFIG_IEEE80211W */
 220
 221         wpa_supplicant_cancel_scan(wpa_s);
 222
 223         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 224                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 225                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 226
 227         wpa_clear_keys(wpa_s, bss->bssid);
 228         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 229         old_ssid = wpa_s->current_ssid;
 230         wpa_s->current_ssid = ssid;
 231         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 232         wpa_supplicant_initiate_eapol(wpa_s);
 233         if (old_ssid != wpa_s->current_ssid)
 234                 wpas_notify_network_changed(wpa_s);
 235
 236         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 237                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 238                         "driver failed");
 239                 return;
 240         }
 241
 242         /* TODO: add timeout on authentication */
 243
 244         /*
 245          * Association will be started based on the authentication event from
 246          * the driver.
 247          */
 248 }
 249
 250
 251 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 252 {
 253         struct wpa_driver_associate_params params;
 254         struct wpa_ssid *ssid = wpa_s->current_ssid;
 255
 256         if (ssid == NULL) {
 257                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 258                            "network is not selected");
 259                 return;
 260         }
 261
 262         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 263                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 264                            "not in authenticating state");
 265                 return;
 266         }
 267
 268         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 269                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 270                            "unexpected peer " MACSTR,
 271                            MAC2STR(data->auth.peer));
 272                 return;
 273         }
 274
 275         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 276                    " auth_type=%d status_code=%d",
 277                    MAC2STR(data->auth.peer), data->auth.auth_type,
 278                    data->auth.status_code);
 279         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 280                     data->auth.ies, data->auth.ies_len);
 281
 282         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 283                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 284                            "code %d)", data->auth.status_code);
 285                 return;
 286         }
 287
 288 #ifdef CONFIG_IEEE80211R
 289         if (data->auth.auth_type == WLAN_AUTH_FT) {
 290                 union wpa_event_data edata;
 291                 os_memset(&edata, 0, sizeof(edata));
 292                 edata.ft_ies.ies = data->auth.ies;
 293                 edata.ft_ies.ies_len = data->auth.ies_len;
 294                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 295                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 296         }
 297 #endif /* CONFIG_IEEE80211R */
 298
 299         os_memset(&params, 0, sizeof(params));
 300         params.bssid = data->auth.peer;
 301         params.ssid = wpa_s->sme.ssid;
 302         params.ssid_len = wpa_s->sme.ssid_len;
 303         params.freq = wpa_s->sme.freq;
 304         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 305                 wpa_s->sme.assoc_req_ie : NULL;
 306         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 307 #ifdef CONFIG_IEEE80211R
 308         if (data->auth.auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 309                 params.wpa_ie = wpa_s->sme.ft_ies;
 310                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 311         }
 312 #endif /* CONFIG_IEEE80211R */
 313         params.mode = ssid->mode;
 314         params.mgmt_frame_protection = wpa_s->sme.mfp;
 315
 316         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 317                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 318                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 319                 params.freq);
 320
 321         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 322
 323         if (wpa_drv_associate(wpa_s, &params) < 0) {
 324                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 325                         "failed");
 326                 return;
 327         }
 328
 329         /* TODO: add timeout on association */
 330 }
 331
 332
 333 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 334                       const u8 *ies, size_t ies_len)
 335 {
 336         if (md == NULL || ies == NULL) {
 337                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 338                 os_free(wpa_s->sme.ft_ies);
 339                 wpa_s->sme.ft_ies = NULL;
 340                 wpa_s->sme.ft_ies_len = 0;
 341                 wpa_s->sme.ft_used = 0;
 342                 return 0;
 343         }
 344
 345         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 346         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 347         os_free(wpa_s->sme.ft_ies);
 348         wpa_s->sme.ft_ies = os_malloc(ies_len);
 349         if (wpa_s->sme.ft_ies == NULL)
 350                 return -1;
 351         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 352         wpa_s->sme.ft_ies_len = ies_len;
 353         return 0;
 354 }
 355
 356
 357 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 358                             union wpa_event_data *data)
 359 {
 360         int bssid_changed;
 361         int timeout = 5000;
 362
 363         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 364                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 365                    data->assoc_reject.status_code);
 366
 367         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 368
 369         /*
 370          * For now, unconditionally terminate the previous authentication. In
 371          * theory, this should not be needed, but mac80211 gets quite confused
 372          * if the authentication is left pending.. Some roaming cases might
 373          * benefit from using the previous authentication, so this could be
 374          * optimized in the future.
 375          */
 376         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 377                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 378                 wpa_msg(wpa_s, MSG_INFO,
 379                         "Deauth request to the driver failed");
 380         }
 381
 382         if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
 383                 struct wpa_blacklist *b;
 384                 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
 385                 if (b && b->count < 3) {
 386                         /*
 387                          * Speed up next attempt if there could be other APs
 388                          * that could accept association.
 389                          */
 390                         timeout = 100;
 391                 }
 392         }
 393         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 394         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 395         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 396         if (bssid_changed)
 397                 wpas_notify_bssid_changed(wpa_s);
 398
 399         /*
 400          * TODO: if more than one possible AP is available in scan results,
 401          * could try the other ones before requesting a new scan.
 402          */
 403         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 404                                 1000 * (timeout % 1000));
 405 }
 406
 407
 408 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 409                               union wpa_event_data *data)
 410 {
 411         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 412         wpa_supplicant_req_scan(wpa_s, 5, 0);
 413 }
 414
 415
 416 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 417                                union wpa_event_data *data)
 418 {
 419         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 420         wpa_supplicant_mark_disassoc(wpa_s);
 421         wpa_supplicant_req_scan(wpa_s, 5, 0);
 422 }