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