git.maemo.org Git - wpasupplicant/blob - 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 "sme.h"
  29
  30 void sme_authenticate(struct wpa_supplicant *wpa_s,
  31                       struct wpa_scan_res *bss, struct wpa_ssid *ssid)
  32 {
  33         struct wpa_driver_auth_params params;
  34         const u8 *ie;
  35 #ifdef CONFIG_IEEE80211R
  36         const u8 *md = NULL;
  37 #endif /* CONFIG_IEEE80211R */
  38         int i;
  39
  40         if (bss == NULL) {
  41                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  42                            "network");
  43                 return;
  44         }
  45
  46         os_memset(&params, 0, sizeof(params));
  47         wpa_s->reassociate = 0;
  48
  49         params.freq = bss->freq;
  50         params.bssid = bss->bssid;
  51         ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
  52         if (ie == NULL) {
  53                 wpa_printf(MSG_ERROR, "SME: SSID not available for the BSS");
  54                 return;
  55         }
  56         params.ssid = ie + 2;
  57         params.ssid_len = ie[1];
  58
  59         wpa_s->sme.freq = params.freq;
  60         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  61         wpa_s->sme.ssid_len = params.ssid_len;
  62
  63         params.auth_alg = AUTH_ALG_OPEN_SYSTEM;
  64 #ifdef IEEE8021X_EAPOL
  65         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  66                 if (ssid->leap) {
  67                         if (ssid->non_leap == 0)
  68                                 params.auth_alg = AUTH_ALG_LEAP;
  69                         else
  70                                 params.auth_alg |= AUTH_ALG_LEAP;
  71                 }
  72         }
  73 #endif /* IEEE8021X_EAPOL */
  74         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  75                    params.auth_alg);
  76         if (ssid->auth_alg) {
  77                 params.auth_alg = 0;
  78                 if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
  79                         params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
  80                 if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
  81                         params.auth_alg |= AUTH_ALG_SHARED_KEY;
  82                 if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
  83                         params.auth_alg |= AUTH_ALG_LEAP;
  84                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  85                            params.auth_alg);
  86         }
  87
  88         for (i = 0; i < NUM_WEP_KEYS; i++) {
  89                 if (ssid->wep_key_len[i])
  90                         params.wep_key[i] = ssid->wep_key[i];
  91                 params.wep_key_len[i] = ssid->wep_key_len[i];
  92         }
  93         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  94
  95         os_memset(wpa_s->bssid, 0, ETH_ALEN);
  96         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
  97
  98         if (bss && (wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
  99                     wpa_scan_get_ie(bss, WLAN_EID_RSN)) &&
 100             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 101                                WPA_KEY_MGMT_FT_IEEE8021X |
 102                                WPA_KEY_MGMT_FT_PSK |
 103                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
 104                                WPA_KEY_MGMT_PSK_SHA256))) {
 105                 int try_opportunistic;
 106                 try_opportunistic = ssid->proactive_key_caching &&
 107                         (ssid->proto & WPA_PROTO_RSN);
 108                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
 109                                             wpa_s->current_ssid,
 110                                             try_opportunistic) == 0)
 111                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 112                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 113                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
 114                                               wpa_s->sme.assoc_req_ie,
 115                                               &wpa_s->sme.assoc_req_ie_len)) {
 116                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 117                                    "management and encryption suites");
 118                         return;
 119                 }
 120         } else if (ssid->key_mgmt &
 121                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
 122                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
 123                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
 124                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
 125                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 126                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
 127                                               wpa_s->sme.assoc_req_ie,
 128                                               &wpa_s->sme.assoc_req_ie_len)) {
 129                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 130                                    "management and encryption suites (no scan "
 131                                    "results)");
 132                         return;
 133                 }
 134 #ifdef CONFIG_WPS
 135         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 136                 struct wpabuf *wps_ie;
 137                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
 138                 if (wps_ie && wpabuf_len(wps_ie) <=
 139                     sizeof(wpa_s->sme.assoc_req_ie)) {
 140                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
 141                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
 142                                   wpa_s->sme.assoc_req_ie_len);
 143                 } else
 144                         wpa_s->sme.assoc_req_ie_len = 0;
 145                 wpabuf_free(wps_ie);
 146                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 147 #endif /* CONFIG_WPS */
 148         } else {
 149                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 150                 wpa_s->sme.assoc_req_ie_len = 0;
 151         }
 152
 153 #ifdef CONFIG_IEEE80211R
 154         ie = wpa_scan_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 155         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 156                 md = ie + 2;
 157         wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
 158         if (md) {
 159                 /* Prepare for the next transition */
 160                 wpa_ft_prepare_auth_request(wpa_s->wpa);
 161         }
 162
 163         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
 164                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
 165                 if (wpa_s->sme.assoc_req_ie_len + 5 <
 166                     sizeof(wpa_s->sme.assoc_req_ie)) {
 167                         struct rsn_mdie *mdie;
 168                         u8 *pos = wpa_s->sme.assoc_req_ie +
 169                                 wpa_s->sme.assoc_req_ie_len;
 170                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 171                         *pos++ = sizeof(*mdie);
 172                         mdie = (struct rsn_mdie *) pos;
 173                         os_memcpy(mdie->mobility_domain, md,
 174                                   MOBILITY_DOMAIN_ID_LEN);
 175                         mdie->ft_capab = 0;
 176                         wpa_s->sme.assoc_req_ie_len += 5;
 177                 }
 178
 179                 if (wpa_s->sme.ft_used &&
 180                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0) {
 181                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
 182                                    "over-the-air");
 183                         params.auth_alg = AUTH_ALG_FT;
 184                         params.ie = wpa_s->sme.ft_ies;
 185                         params.ie_len = wpa_s->sme.ft_ies_len;
 186                 }
 187         }
 188 #endif /* CONFIG_IEEE80211R */
 189
 190 #ifdef CONFIG_IEEE80211W
 191         switch (ssid->ieee80211w) {
 192         case NO_IEEE80211W:
 193                 wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
 194                 break;
 195         case IEEE80211W_OPTIONAL:
 196                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
 197                 break;
 198         case IEEE80211W_REQUIRED:
 199                 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 200                 break;
 201         }
 202         if (ssid->ieee80211w != NO_IEEE80211W && bss) {
 203                 const u8 *rsn = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 204                 struct wpa_ie_data _ie;
 205                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 206                     _ie.capabilities &
 207                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 208                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 209                                    "require MFP");
 210                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 211                 }
 212         }
 213 #endif /* CONFIG_IEEE80211W */
 214
 215         wpa_supplicant_cancel_scan(wpa_s);
 216
 217         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 218                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 219                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 220
 221         wpa_clear_keys(wpa_s, bss->bssid);
 222         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 223         wpa_s->current_ssid = ssid;
 224         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 225         wpa_supplicant_initiate_eapol(wpa_s);
 226
 227         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 228                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 229                         "driver failed");
 230                 return;
 231         }
 232
 233         /* TODO: add timeout on authentication */
 234
 235         /*
 236          * Association will be started based on the authentication event from
 237          * the driver.
 238          */
 239 }
 240
 241
 242 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 243 {
 244         struct wpa_driver_associate_params params;
 245         struct wpa_ssid *ssid = wpa_s->current_ssid;
 246
 247         if (ssid == NULL) {
 248                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 249                            "network is not selected");
 250                 return;
 251         }
 252
 253         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 254                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 255                            "not in authenticating state");
 256                 return;
 257         }
 258
 259         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 260                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 261                            "unexpected peer " MACSTR,
 262                            MAC2STR(data->auth.peer));
 263                 return;
 264         }
 265
 266         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 267                    " auth_type=%d status_code=%d",
 268                    MAC2STR(data->auth.peer), data->auth.auth_type,
 269                    data->auth.status_code);
 270         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 271                     data->auth.ies, data->auth.ies_len);
 272
 273         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 274                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 275                            "code %d)", data->auth.status_code);
 276                 return;
 277         }
 278
 279 #ifdef CONFIG_IEEE80211R
 280         if (data->auth.auth_type == WLAN_AUTH_FT) {
 281                 union wpa_event_data edata;
 282                 os_memset(&edata, 0, sizeof(edata));
 283                 edata.ft_ies.ies = data->auth.ies;
 284                 edata.ft_ies.ies_len = data->auth.ies_len;
 285                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 286                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 287         }
 288 #endif /* CONFIG_IEEE80211R */
 289
 290         os_memset(&params, 0, sizeof(params));
 291         params.bssid = data->auth.peer;
 292         params.ssid = wpa_s->sme.ssid;
 293         params.ssid_len = wpa_s->sme.ssid_len;
 294         params.freq = wpa_s->sme.freq;
 295         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 296                 wpa_s->sme.assoc_req_ie : NULL;
 297         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 298 #ifdef CONFIG_IEEE80211R
 299         if (data->auth.auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 300                 params.wpa_ie = wpa_s->sme.ft_ies;
 301                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 302         }
 303 #endif /* CONFIG_IEEE80211R */
 304         params.mode = ssid->mode;
 305         params.mgmt_frame_protection = wpa_s->sme.mfp;
 306
 307         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 308                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 309                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 310                 params.freq);
 311
 312         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 313
 314         if (wpa_drv_associate(wpa_s, &params) < 0) {
 315                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 316                         "failed");
 317                 return;
 318         }
 319
 320         /* TODO: add timeout on association */
 321 }
 322
 323
 324 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 325                       const u8 *ies, size_t ies_len)
 326 {
 327         if (md == NULL || ies == NULL) {
 328                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 329                 os_free(wpa_s->sme.ft_ies);
 330                 wpa_s->sme.ft_ies = NULL;
 331                 wpa_s->sme.ft_ies_len = 0;
 332                 wpa_s->sme.ft_used = 0;
 333                 return 0;
 334         }
 335
 336         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 337         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 338         os_free(wpa_s->sme.ft_ies);
 339         wpa_s->sme.ft_ies = os_malloc(ies_len);
 340         if (wpa_s->sme.ft_ies == NULL)
 341                 return -1;
 342         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 343         wpa_s->sme.ft_ies_len = ies_len;
 344         return 0;
 345 }
 346
 347
 348 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 349                             union wpa_event_data *data)
 350 {
 351         wpa_printf(MSG_DEBUG, "SME: Association failed: status code %d",
 352                    data->assoc_reject.status_code);
 353
 354         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 355         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 356         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 357
 358         /*
 359          * TODO: if more than one possible AP is available in scan results,
 360          * could try the other ones before requesting a new scan.
 361          */
 362         wpa_supplicant_req_scan(wpa_s, 5, 0);
 363 }
 364
 365
 366 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 367                               union wpa_event_data *data)
 368 {
 369         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 370         wpa_supplicant_req_scan(wpa_s, 5, 0);
 371 }
 372
 373
 374 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 375                                union wpa_event_data *data)
 376 {
 377         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 378         wpa_supplicant_mark_disassoc(wpa_s);
 379         wpa_supplicant_req_scan(wpa_s, 5, 0);
 380 }