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 "sme.h"
  30
  31 void sme_authenticate(struct wpa_supplicant *wpa_s,
  32                       struct wpa_scan_res *bss, struct wpa_ssid *ssid)
  33 {
  34         struct wpa_driver_auth_params params;
  35         struct wpa_ssid *old_ssid;
  36         const u8 *ie;
  37 #ifdef CONFIG_IEEE80211R
  38         const u8 *md = NULL;
  39 #endif /* CONFIG_IEEE80211R */
  40         int i, bssid_changed;
  41
  42         if (bss == NULL) {
  43                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  44                            "network");
  45                 return;
  46         }
  47
  48         os_memset(&params, 0, sizeof(params));
  49         wpa_s->reassociate = 0;
  50
  51         params.freq = bss->freq;
  52         params.bssid = bss->bssid;
  53         ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
  54         if (ie == NULL) {
  55                 wpa_printf(MSG_ERROR, "SME: SSID not available for the BSS");
  56                 return;
  57         }
  58         params.ssid = ie + 2;
  59         params.ssid_len = ie[1];
  60
  61         wpa_s->sme.freq = params.freq;
  62         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  63         wpa_s->sme.ssid_len = params.ssid_len;
  64
  65         params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
  66 #ifdef IEEE8021X_EAPOL
  67         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  68                 if (ssid->leap) {
  69                         if (ssid->non_leap == 0)
  70                                 params.auth_alg = AUTH_ALG_LEAP;
  71                         else
  72                                 params.auth_alg |= AUTH_ALG_LEAP;
  73                 }
  74         }
  75 #endif /* IEEE8021X_EAPOL */
  76         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  77                    params.auth_alg);
  78         if (ssid->auth_alg) {
  79                 params.auth_alg = 0;
  80                 if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
  81                         params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
  82                 if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
  83                         params.auth_alg |= AUTH_ALG_SHARED_KEY;
  84                 if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
  85                         params.auth_alg |= AUTH_ALG_LEAP;
  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 (bss && (wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 104                     wpa_scan_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_scan_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 = 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         switch (ssid->ieee80211w) {
 197         case NO_IEEE80211W:
 198                 wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
 199                 break;
 200         case IEEE80211W_OPTIONAL:
 201                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
 202                 break;
 203         case IEEE80211W_REQUIRED:
 204                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 205                 break;
 206         }
 207         if (ssid->ieee80211w != NO_IEEE80211W && bss) {
 208                 const u8 *rsn = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 209                 struct wpa_ie_data _ie;
 210                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 211                     _ie.capabilities &
 212                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 213                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 214                                    "require MFP");
 215                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 216                 }
 217         }
 218 #endif /* CONFIG_IEEE80211W */
 219
 220         wpa_supplicant_cancel_scan(wpa_s);
 221
 222         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 223                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 224                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 225
 226         wpa_clear_keys(wpa_s, bss->bssid);
 227         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 228         old_ssid = wpa_s->current_ssid;
 229         wpa_s->current_ssid = ssid;
 230         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 231         wpa_supplicant_initiate_eapol(wpa_s);
 232         if (old_ssid != wpa_s->current_ssid)
 233                 wpas_notify_network_changed(wpa_s);
 234
 235         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 236                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 237                         "driver failed");
 238                 return;
 239         }
 240
 241         /* TODO: add timeout on authentication */
 242
 243         /*
 244          * Association will be started based on the authentication event from
 245          * the driver.
 246          */
 247 }
 248
 249
 250 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 251 {
 252         struct wpa_driver_associate_params params;
 253         struct wpa_ssid *ssid = wpa_s->current_ssid;
 254
 255         if (ssid == NULL) {
 256                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 257                            "network is not selected");
 258                 return;
 259         }
 260
 261         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 262                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 263                            "not in authenticating state");
 264                 return;
 265         }
 266
 267         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 268                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 269                            "unexpected peer " MACSTR,
 270                            MAC2STR(data->auth.peer));
 271                 return;
 272         }
 273
 274         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 275                    " auth_type=%d status_code=%d",
 276                    MAC2STR(data->auth.peer), data->auth.auth_type,
 277                    data->auth.status_code);
 278         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 279                     data->auth.ies, data->auth.ies_len);
 280
 281         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 282                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 283                            "code %d)", data->auth.status_code);
 284                 return;
 285         }
 286
 287 #ifdef CONFIG_IEEE80211R
 288         if (data->auth.auth_type == WLAN_AUTH_FT) {
 289                 union wpa_event_data edata;
 290                 os_memset(&edata, 0, sizeof(edata));
 291                 edata.ft_ies.ies = data->auth.ies;
 292                 edata.ft_ies.ies_len = data->auth.ies_len;
 293                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 294                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 295         }
 296 #endif /* CONFIG_IEEE80211R */
 297
 298         os_memset(&params, 0, sizeof(params));
 299         params.bssid = data->auth.peer;
 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 (data->auth.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 = ssid->mode;
 313         params.mgmt_frame_protection = wpa_s->sme.mfp;
 314
 315         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 316                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 317                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 318                 params.freq);
 319
 320         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 321
 322         if (wpa_drv_associate(wpa_s, &params) < 0) {
 323                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 324                         "failed");
 325                 return;
 326         }
 327
 328         /* TODO: add timeout on association */
 329 }
 330
 331
 332 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 333                       const u8 *ies, size_t ies_len)
 334 {
 335         if (md == NULL || ies == NULL) {
 336                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 337                 os_free(wpa_s->sme.ft_ies);
 338                 wpa_s->sme.ft_ies = NULL;
 339                 wpa_s->sme.ft_ies_len = 0;
 340                 wpa_s->sme.ft_used = 0;
 341                 return 0;
 342         }
 343
 344         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 345         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 346         os_free(wpa_s->sme.ft_ies);
 347         wpa_s->sme.ft_ies = os_malloc(ies_len);
 348         if (wpa_s->sme.ft_ies == NULL)
 349                 return -1;
 350         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 351         wpa_s->sme.ft_ies_len = ies_len;
 352         return 0;
 353 }
 354
 355
 356 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 357                             union wpa_event_data *data)
 358 {
 359         int bssid_changed;
 360
 361         wpa_printf(MSG_DEBUG, "SME: Association failed: status code %d",
 362                    data->assoc_reject.status_code);
 363
 364         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 365         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 366         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 367         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 368         if (bssid_changed)
 369                 wpas_notify_bssid_changed(wpa_s);
 370
 371         /*
 372          * TODO: if more than one possible AP is available in scan results,
 373          * could try the other ones before requesting a new scan.
 374          */
 375         wpa_supplicant_req_scan(wpa_s, 5, 0);
 376 }
 377
 378
 379 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 380                               union wpa_event_data *data)
 381 {
 382         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 383         wpa_supplicant_req_scan(wpa_s, 5, 0);
 384 }
 385
 386
 387 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 388                                union wpa_event_data *data)
 389 {
 390         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 391         wpa_supplicant_mark_disassoc(wpa_s);
 392         wpa_supplicant_req_scan(wpa_s, 5, 0);
 393 }