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