wpa_supplicant/wps_supplicant.c

   1 /*
   2  * wpa_supplicant / WPS integration
   3  * Copyright (c) 2008, 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 "ieee802_11_common.h"
  20 #include "wpa_common.h"
  21 #include "config.h"
  22 #include "eap_peer/eap.h"
  23 #include "wpa_supplicant_i.h"
  24 #include "driver_i.h"
  25 #include "eloop.h"
  26 #include "uuid.h"
  27 #include "wpa_ctrl.h"
  28 #include "notify.h"
  29 #include "eap_common/eap_wsc_common.h"
  30 #include "blacklist.h"
  31 #include "wpa.h"
  32 #include "wps_supplicant.h"
  33 #include "dh_group5.h"
  34
  35 #define WPS_PIN_SCAN_IGNORE_SEL_REG 3
  36
  37 static void wpas_wps_timeout(void *eloop_ctx, void *timeout_ctx);
  38 static void wpas_clear_wps(struct wpa_supplicant *wpa_s);
  39
  40
  41 int wpas_wps_eapol_cb(struct wpa_supplicant *wpa_s)
  42 {
  43         if (!wpa_s->wps_success &&
  44             wpa_s->current_ssid &&
  45             eap_is_wps_pin_enrollee(&wpa_s->current_ssid->eap)) {
  46                 const u8 *bssid = wpa_s->bssid;
  47                 if (is_zero_ether_addr(bssid))
  48                         bssid = wpa_s->pending_bssid;
  49
  50                 wpa_printf(MSG_DEBUG, "WPS: PIN registration with " MACSTR
  51                            " did not succeed - continue trying to find "
  52                            "suitable AP", MAC2STR(bssid));
  53                 wpa_blacklist_add(wpa_s, bssid);
  54
  55                 wpa_supplicant_deauthenticate(wpa_s,
  56                                               WLAN_REASON_DEAUTH_LEAVING);
  57                 wpa_s->reassociate = 1;
  58                 wpa_supplicant_req_scan(wpa_s,
  59                                         wpa_s->blacklist_cleared ? 5 : 0, 0);
  60                 wpa_s->blacklist_cleared = 0;
  61                 return 1;
  62         }
  63
  64         eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);
  65
  66         if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPS && wpa_s->current_ssid &&
  67             !(wpa_s->current_ssid->key_mgmt & WPA_KEY_MGMT_WPS)) {
  68                 wpa_printf(MSG_DEBUG, "WPS: Network configuration replaced - "
  69                            "try to associate with the received credential");
  70                 wpa_supplicant_deauthenticate(wpa_s,
  71                                               WLAN_REASON_DEAUTH_LEAVING);
  72                 wpa_s->reassociate = 1;
  73                 wpa_supplicant_req_scan(wpa_s, 0, 0);
  74                 return 1;
  75         }
  76
  77         if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPS && wpa_s->current_ssid) {
  78                 wpa_printf(MSG_DEBUG, "WPS: Registration completed - waiting "
  79                            "for external credential processing");
  80                 wpas_clear_wps(wpa_s);
  81                 wpa_supplicant_deauthenticate(wpa_s,
  82                                               WLAN_REASON_DEAUTH_LEAVING);
  83                 return 1;
  84         }
  85
  86         return 0;
  87 }
  88
  89
  90 static void wpas_wps_security_workaround(struct wpa_supplicant *wpa_s,
  91                                          struct wpa_ssid *ssid,
  92                                          const struct wps_credential *cred)
  93 {
  94         struct wpa_driver_capa capa;
  95         size_t i;
  96         struct wpa_scan_res *bss;
  97         const u8 *ie;
  98         struct wpa_ie_data adv;
  99         int wpa2 = 0, ccmp = 0;
 100
 101         /*
 102          * Many existing WPS APs do not know how to negotiate WPA2 or CCMP in
 103          * case they are configured for mixed mode operation (WPA+WPA2 and
 104          * TKIP+CCMP). Try to use scan results to figure out whether the AP
 105          * actually supports stronger security and select that if the client
 106          * has support for it, too.
 107          */
 108
 109         if (wpa_drv_get_capa(wpa_s, &capa))
 110                 return; /* Unknown what driver supports */
 111
 112         if (wpa_supplicant_get_scan_results(wpa_s) || wpa_s->scan_res == NULL)
 113                 return; /* Could not get scan results for checking advertised
 114                          * parameters */
 115
 116         for (i = 0; i < wpa_s->scan_res->num; i++) {
 117                 bss = wpa_s->scan_res->res[i];
 118                 if (os_memcmp(bss->bssid, cred->mac_addr, ETH_ALEN) != 0)
 119                         continue;
 120                 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
 121                 if (ie == NULL)
 122                         continue;
 123                 if (ie[1] != ssid->ssid_len || ssid->ssid == NULL ||
 124                     os_memcmp(ie + 2, ssid->ssid, ssid->ssid_len) != 0)
 125                         continue;
 126
 127                 wpa_printf(MSG_DEBUG, "WPS: AP found from scan results");
 128                 break;
 129         }
 130
 131         if (i == wpa_s->scan_res->num) {
 132                 wpa_printf(MSG_DEBUG, "WPS: The AP was not found from scan "
 133                            "results - use credential as-is");
 134                 return;
 135         }
 136
 137         ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
 138         if (ie && wpa_parse_wpa_ie(ie, 2 + ie[1], &adv) == 0) {
 139                 wpa2 = 1;
 140                 if (adv.pairwise_cipher & WPA_CIPHER_CCMP)
 141                         ccmp = 1;
 142         } else {
 143                 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
 144                 if (ie && wpa_parse_wpa_ie(ie, 2 + ie[1], &adv) == 0 &&
 145                     adv.pairwise_cipher & WPA_CIPHER_CCMP)
 146                         ccmp = 1;
 147         }
 148
 149         if (ie == NULL && (ssid->proto & WPA_PROTO_WPA) &&
 150             (ssid->pairwise_cipher & WPA_CIPHER_TKIP)) {
 151                 /*
 152                  * TODO: This could be the initial AP configuration and the
 153                  * Beacon contents could change shortly. Should request a new
 154                  * scan and delay addition of the network until the updated
 155                  * scan results are available.
 156                  */
 157                 wpa_printf(MSG_DEBUG, "WPS: The AP did not yet advertise WPA "
 158                            "support - use credential as-is");
 159                 return;
 160         }
 161
 162         if (ccmp && !(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
 163             (ssid->pairwise_cipher & WPA_CIPHER_TKIP) &&
 164             (capa.key_mgmt & WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK)) {
 165                 wpa_printf(MSG_DEBUG, "WPS: Add CCMP into the credential "
 166                            "based on scan results");
 167                 if (wpa_s->conf->ap_scan == 1)
 168                         ssid->pairwise_cipher |= WPA_CIPHER_CCMP;
 169                 else
 170                         ssid->pairwise_cipher = WPA_CIPHER_CCMP;
 171         }
 172
 173         if (wpa2 && !(ssid->proto & WPA_PROTO_RSN) &&
 174             (ssid->proto & WPA_PROTO_WPA) &&
 175             (capa.enc & WPA_DRIVER_CAPA_ENC_CCMP)) {
 176                 wpa_printf(MSG_DEBUG, "WPS: Add WPA2 into the credential "
 177                            "based on scan results");
 178                 if (wpa_s->conf->ap_scan == 1)
 179                         ssid->proto |= WPA_PROTO_RSN;
 180                 else
 181                         ssid->proto = WPA_PROTO_RSN;
 182         }
 183 }
 184
 185
 186 static int wpa_supplicant_wps_cred(void *ctx,
 187                                    const struct wps_credential *cred)
 188 {
 189         struct wpa_supplicant *wpa_s = ctx;
 190         struct wpa_ssid *ssid = wpa_s->current_ssid;
 191         u8 key_idx = 0;
 192         u16 auth_type;
 193
 194         if ((wpa_s->conf->wps_cred_processing == 1 ||
 195              wpa_s->conf->wps_cred_processing == 2) && cred->cred_attr) {
 196                 size_t blen = cred->cred_attr_len * 2 + 1;
 197                 char *buf = os_malloc(blen);
 198                 if (buf) {
 199                         wpa_snprintf_hex(buf, blen,
 200                                          cred->cred_attr, cred->cred_attr_len);
 201                         wpa_msg(wpa_s, MSG_INFO, "%s%s",
 202                                 WPS_EVENT_CRED_RECEIVED, buf);
 203                         os_free(buf);
 204                 }
 205
 206                 wpas_notify_wps_credential(wpa_s, cred);
 207         } else
 208                 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_CRED_RECEIVED);
 209
 210         wpa_hexdump_key(MSG_DEBUG, "WPS: Received Credential attribute",
 211                         cred->cred_attr, cred->cred_attr_len);
 212
 213         if (wpa_s->conf->wps_cred_processing == 1)
 214                 return 0;
 215
 216         wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID", cred->ssid, cred->ssid_len);
 217         wpa_printf(MSG_DEBUG, "WPS: Authentication Type 0x%x",
 218                    cred->auth_type);
 219         wpa_printf(MSG_DEBUG, "WPS: Encryption Type 0x%x", cred->encr_type);
 220         wpa_printf(MSG_DEBUG, "WPS: Network Key Index %d", cred->key_idx);
 221         wpa_hexdump_key(MSG_DEBUG, "WPS: Network Key",
 222                         cred->key, cred->key_len);
 223         wpa_printf(MSG_DEBUG, "WPS: MAC Address " MACSTR,
 224                    MAC2STR(cred->mac_addr));
 225
 226         auth_type = cred->auth_type;
 227         if (auth_type == (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
 228                 wpa_printf(MSG_DEBUG, "WPS: Workaround - convert mixed-mode "
 229                            "auth_type into WPA2PSK");
 230                 auth_type = WPS_AUTH_WPA2PSK;
 231         }
 232
 233         if (auth_type != WPS_AUTH_OPEN &&
 234             auth_type != WPS_AUTH_SHARED &&
 235             auth_type != WPS_AUTH_WPAPSK &&
 236             auth_type != WPS_AUTH_WPA2PSK) {
 237                 wpa_printf(MSG_DEBUG, "WPS: Ignored credentials for "
 238                            "unsupported authentication type 0x%x",
 239                            auth_type);
 240                 return 0;
 241         }
 242
 243         if (ssid && (ssid->key_mgmt & WPA_KEY_MGMT_WPS)) {
 244                 wpa_printf(MSG_DEBUG, "WPS: Replace WPS network block based "
 245                            "on the received credential");
 246                 os_free(ssid->eap.identity);
 247                 ssid->eap.identity = NULL;
 248                 ssid->eap.identity_len = 0;
 249                 os_free(ssid->eap.phase1);
 250                 ssid->eap.phase1 = NULL;
 251                 os_free(ssid->eap.eap_methods);
 252                 ssid->eap.eap_methods = NULL;
 253         } else {
 254                 wpa_printf(MSG_DEBUG, "WPS: Create a new network based on the "
 255                            "received credential");
 256                 ssid = wpa_config_add_network(wpa_s->conf);
 257                 if (ssid == NULL)
 258                         return -1;
 259                 wpas_notify_network_added(wpa_s, ssid);
 260         }
 261
 262         wpa_config_set_network_defaults(ssid);
 263
 264         os_free(ssid->ssid);
 265         ssid->ssid = os_malloc(cred->ssid_len);
 266         if (ssid->ssid) {
 267                 os_memcpy(ssid->ssid, cred->ssid, cred->ssid_len);
 268                 ssid->ssid_len = cred->ssid_len;
 269         }
 270
 271         switch (cred->encr_type) {
 272         case WPS_ENCR_NONE:
 273                 break;
 274         case WPS_ENCR_WEP:
 275                 if (cred->key_len <= 0)
 276                         break;
 277                 if (cred->key_len != 5 && cred->key_len != 13 &&
 278                     cred->key_len != 10 && cred->key_len != 26) {
 279                         wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key length "
 280                                    "%lu", (unsigned long) cred->key_len);
 281                         return -1;
 282                 }
 283                 if (cred->key_idx > NUM_WEP_KEYS) {
 284                         wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key index %d",
 285                                    cred->key_idx);
 286                         return -1;
 287                 }
 288                 if (cred->key_idx)
 289                         key_idx = cred->key_idx - 1;
 290                 if (cred->key_len == 10 || cred->key_len == 26) {
 291                         if (hexstr2bin((char *) cred->key,
 292                                        ssid->wep_key[key_idx],
 293                                        cred->key_len / 2) < 0) {
 294                                 wpa_printf(MSG_ERROR, "WPS: Invalid WEP Key "
 295                                            "%d", key_idx);
 296                                 return -1;
 297                         }
 298                         ssid->wep_key_len[key_idx] = cred->key_len / 2;
 299                 } else {
 300                         os_memcpy(ssid->wep_key[key_idx], cred->key,
 301                                   cred->key_len);
 302                         ssid->wep_key_len[key_idx] = cred->key_len;
 303                 }
 304                 ssid->wep_tx_keyidx = key_idx;
 305                 break;
 306         case WPS_ENCR_TKIP:
 307                 ssid->pairwise_cipher = WPA_CIPHER_TKIP;
 308                 break;
 309         case WPS_ENCR_AES:
 310                 ssid->pairwise_cipher = WPA_CIPHER_CCMP;
 311                 break;
 312         }
 313
 314         switch (auth_type) {
 315         case WPS_AUTH_OPEN:
 316                 ssid->auth_alg = WPA_AUTH_ALG_OPEN;
 317                 ssid->key_mgmt = WPA_KEY_MGMT_NONE;
 318                 ssid->proto = 0;
 319                 break;
 320         case WPS_AUTH_SHARED:
 321                 ssid->auth_alg = WPA_AUTH_ALG_SHARED;
 322                 ssid->key_mgmt = WPA_KEY_MGMT_NONE;
 323                 ssid->proto = 0;
 324                 break;
 325         case WPS_AUTH_WPAPSK:
 326                 ssid->auth_alg = WPA_AUTH_ALG_OPEN;
 327                 ssid->key_mgmt = WPA_KEY_MGMT_PSK;
 328                 ssid->proto = WPA_PROTO_WPA;
 329                 break;
 330         case WPS_AUTH_WPA:
 331                 ssid->auth_alg = WPA_AUTH_ALG_OPEN;
 332                 ssid->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
 333                 ssid->proto = WPA_PROTO_WPA;
 334                 break;
 335         case WPS_AUTH_WPA2:
 336                 ssid->auth_alg = WPA_AUTH_ALG_OPEN;
 337                 ssid->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
 338                 ssid->proto = WPA_PROTO_RSN;
 339                 break;
 340         case WPS_AUTH_WPA2PSK:
 341                 ssid->auth_alg = WPA_AUTH_ALG_OPEN;
 342                 ssid->key_mgmt = WPA_KEY_MGMT_PSK;
 343                 ssid->proto = WPA_PROTO_RSN;
 344                 break;
 345         }
 346
 347         if (ssid->key_mgmt == WPA_KEY_MGMT_PSK) {
 348                 if (cred->key_len == 2 * PMK_LEN) {
 349                         if (hexstr2bin((const char *) cred->key, ssid->psk,
 350                                        PMK_LEN)) {
 351                                 wpa_printf(MSG_ERROR, "WPS: Invalid Network "
 352                                            "Key");
 353                                 return -1;
 354                         }
 355                         ssid->psk_set = 1;
 356                 } else if (cred->key_len >= 8 && cred->key_len < 2 * PMK_LEN) {
 357                         os_free(ssid->passphrase);
 358                         ssid->passphrase = os_malloc(cred->key_len + 1);
 359                         if (ssid->passphrase == NULL)
 360                                 return -1;
 361                         os_memcpy(ssid->passphrase, cred->key, cred->key_len);
 362                         ssid->passphrase[cred->key_len] = '\0';
 363                         wpa_config_update_psk(ssid);
 364                 } else {
 365                         wpa_printf(MSG_ERROR, "WPS: Invalid Network Key "
 366                                    "length %lu",
 367                                    (unsigned long) cred->key_len);
 368                         return -1;
 369                 }
 370         }
 371
 372         wpas_wps_security_workaround(wpa_s, ssid, cred);
 373
 374 #ifndef CONFIG_NO_CONFIG_WRITE
 375         if (wpa_s->conf->update_config &&
 376             wpa_config_write(wpa_s->confname, wpa_s->conf)) {
 377                 wpa_printf(MSG_DEBUG, "WPS: Failed to update configuration");
 378                 return -1;
 379         }
 380 #endif /* CONFIG_NO_CONFIG_WRITE */
 381
 382         return 0;
 383 }
 384
 385
 386 static void wpa_supplicant_wps_event_m2d(struct wpa_supplicant *wpa_s,
 387                                          struct wps_event_m2d *m2d)
 388 {
 389         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_M2D
 390                 "dev_password_id=%d config_error=%d",
 391                 m2d->dev_password_id, m2d->config_error);
 392         wpas_notify_wps_event_m2d(wpa_s, m2d);
 393 }
 394
 395
 396 static void wpa_supplicant_wps_event_fail(struct wpa_supplicant *wpa_s,
 397                                           struct wps_event_fail *fail)
 398 {
 399         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_FAIL "msg=%d", fail->msg);
 400         wpas_clear_wps(wpa_s);
 401         wpas_notify_wps_event_fail(wpa_s, fail);
 402 }
 403
 404
 405 static void wpa_supplicant_wps_event_success(struct wpa_supplicant *wpa_s)
 406 {
 407         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_SUCCESS);
 408         wpa_s->wps_success = 1;
 409         wpas_notify_wps_event_success(wpa_s);
 410 }
 411
 412
 413 static void wpa_supplicant_wps_event(void *ctx, enum wps_event event,
 414                                      union wps_event_data *data)
 415 {
 416         struct wpa_supplicant *wpa_s = ctx;
 417         switch (event) {
 418         case WPS_EV_M2D:
 419                 wpa_supplicant_wps_event_m2d(wpa_s, &data->m2d);
 420                 break;
 421         case WPS_EV_FAIL:
 422                 wpa_supplicant_wps_event_fail(wpa_s, &data->fail);
 423                 break;
 424         case WPS_EV_SUCCESS:
 425                 wpa_supplicant_wps_event_success(wpa_s);
 426                 break;
 427         case WPS_EV_PWD_AUTH_FAIL:
 428                 break;
 429         case WPS_EV_PBC_OVERLAP:
 430                 break;
 431         case WPS_EV_PBC_TIMEOUT:
 432                 break;
 433         }
 434 }
 435
 436
 437 enum wps_request_type wpas_wps_get_req_type(struct wpa_ssid *ssid)
 438 {
 439         if (eap_is_wps_pbc_enrollee(&ssid->eap) ||
 440             eap_is_wps_pin_enrollee(&ssid->eap))
 441                 return WPS_REQ_ENROLLEE;
 442         else
 443                 return WPS_REQ_REGISTRAR;
 444 }
 445
 446
 447 static void wpas_clear_wps(struct wpa_supplicant *wpa_s)
 448 {
 449         int id;
 450         struct wpa_ssid *ssid, *remove_ssid = NULL;
 451
 452         eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);
 453
 454         /* Remove any existing WPS network from configuration */
 455         ssid = wpa_s->conf->ssid;
 456         while (ssid) {
 457                 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 458                         if (ssid == wpa_s->current_ssid) {
 459                                 wpa_s->current_ssid = NULL;
 460                                 if (ssid != NULL)
 461                                         wpas_notify_network_changed(wpa_s);
 462                         }
 463                         id = ssid->id;
 464                         remove_ssid = ssid;
 465                 } else
 466                         id = -1;
 467                 ssid = ssid->next;
 468                 if (id >= 0) {
 469                         wpas_notify_network_removed(wpa_s, remove_ssid);
 470                         wpa_config_remove_network(wpa_s->conf, id);
 471                 }
 472         }
 473 }
 474
 475
 476 static void wpas_wps_timeout(void *eloop_ctx, void *timeout_ctx)
 477 {
 478         struct wpa_supplicant *wpa_s = eloop_ctx;
 479         wpa_printf(MSG_INFO, WPS_EVENT_TIMEOUT "Requested operation timed "
 480                    "out");
 481         wpas_clear_wps(wpa_s);
 482 }
 483
 484
 485 static struct wpa_ssid * wpas_wps_add_network(struct wpa_supplicant *wpa_s,
 486                                               int registrar, const u8 *bssid)
 487 {
 488         struct wpa_ssid *ssid;
 489
 490         ssid = wpa_config_add_network(wpa_s->conf);
 491         if (ssid == NULL)
 492                 return NULL;
 493         wpas_notify_network_added(wpa_s, ssid);
 494         wpa_config_set_network_defaults(ssid);
 495         if (wpa_config_set(ssid, "key_mgmt", "WPS", 0) < 0 ||
 496             wpa_config_set(ssid, "eap", "WSC", 0) < 0 ||
 497             wpa_config_set(ssid, "identity", registrar ?
 498                            "\"" WSC_ID_REGISTRAR "\"" :
 499                            "\"" WSC_ID_ENROLLEE "\"", 0) < 0) {
 500                 wpas_notify_network_removed(wpa_s, ssid);
 501                 wpa_config_remove_network(wpa_s->conf, ssid->id);
 502                 return NULL;
 503         }
 504
 505         if (bssid) {
 506                 size_t i;
 507                 struct wpa_scan_res *res;
 508
 509                 os_memcpy(ssid->bssid, bssid, ETH_ALEN);
 510                 ssid->bssid_set = 1;
 511
 512                 /* Try to get SSID from scan results */
 513                 if (wpa_s->scan_res == NULL &&
 514                     wpa_supplicant_get_scan_results(wpa_s) < 0)
 515                         return ssid; /* Could not find any scan results */
 516
 517                 for (i = 0; i < wpa_s->scan_res->num; i++) {
 518                         const u8 *ie;
 519
 520                         res = wpa_s->scan_res->res[i];
 521                         if (os_memcmp(bssid, res->bssid, ETH_ALEN) != 0)
 522                                 continue;
 523
 524                         ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
 525                         if (ie == NULL)
 526                                 break;
 527                         os_free(ssid->ssid);
 528                         ssid->ssid = os_malloc(ie[1]);
 529                         if (ssid->ssid == NULL)
 530                                 break;
 531                         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 532                         ssid->ssid_len = ie[1];
 533                         break;
 534                 }
 535         }
 536
 537         return ssid;
 538 }
 539
 540
 541 static void wpas_wps_reassoc(struct wpa_supplicant *wpa_s,
 542                              struct wpa_ssid *selected)
 543 {
 544         struct wpa_ssid *ssid;
 545
 546         /* Mark all other networks disabled and trigger reassociation */
 547         ssid = wpa_s->conf->ssid;
 548         while (ssid) {
 549                 int was_disabled = ssid->disabled;
 550                 ssid->disabled = ssid != selected;
 551                 if (was_disabled != ssid->disabled)
 552                         wpas_notify_network_enabled_changed(wpa_s, ssid);
 553                 ssid = ssid->next;
 554         }
 555         wpa_s->disconnected = 0;
 556         wpa_s->reassociate = 1;
 557         wpa_s->scan_runs = 0;
 558         wpa_s->wps_success = 0;
 559         wpa_s->blacklist_cleared = 0;
 560         wpa_supplicant_req_scan(wpa_s, 0, 0);
 561 }
 562
 563
 564 int wpas_wps_start_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 565 {
 566         struct wpa_ssid *ssid;
 567         wpas_clear_wps(wpa_s);
 568         ssid = wpas_wps_add_network(wpa_s, 0, bssid);
 569         if (ssid == NULL)
 570                 return -1;
 571         wpa_config_set(ssid, "phase1", "\"pbc=1\"", 0);
 572         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 573                                wpa_s, NULL);
 574         wpas_wps_reassoc(wpa_s, ssid);
 575         return 0;
 576 }
 577
 578
 579 int wpas_wps_start_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 580                        const char *pin)
 581 {
 582         struct wpa_ssid *ssid;
 583         char val[128];
 584         unsigned int rpin = 0;
 585
 586         wpas_clear_wps(wpa_s);
 587         ssid = wpas_wps_add_network(wpa_s, 0, bssid);
 588         if (ssid == NULL)
 589                 return -1;
 590         if (pin)
 591                 os_snprintf(val, sizeof(val), "\"pin=%s\"", pin);
 592         else {
 593                 rpin = wps_generate_pin();
 594                 os_snprintf(val, sizeof(val), "\"pin=%08d\"", rpin);
 595         }
 596         wpa_config_set(ssid, "phase1", val, 0);
 597         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 598                                wpa_s, NULL);
 599         wpas_wps_reassoc(wpa_s, ssid);
 600         return rpin;
 601 }
 602
 603
 604 #ifdef CONFIG_WPS_OOB
 605 int wpas_wps_start_oob(struct wpa_supplicant *wpa_s, char *device_type,
 606                        char *path, char *method, char *name)
 607 {
 608         struct wps_context *wps = wpa_s->wps;
 609         struct oob_device_data *oob_dev;
 610
 611         oob_dev = wps_get_oob_device(device_type);
 612         if (oob_dev == NULL)
 613                 return -1;
 614         oob_dev->device_path = path;
 615         oob_dev->device_name = name;
 616         wps->oob_conf.oob_method = wps_get_oob_method(method);
 617
 618         if (wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E) {
 619                 /*
 620                  * Use pre-configured DH keys in order to be able to write the
 621                  * key hash into the OOB file.
 622                  */
 623                 wpabuf_free(wps->dh_pubkey);
 624                 wpabuf_free(wps->dh_privkey);
 625                 wps->dh_privkey = NULL;
 626                 wps->dh_pubkey = NULL;
 627                 dh5_free(wps->dh_ctx);
 628                 wps->dh_ctx = dh5_init(&wps->dh_privkey, &wps->dh_pubkey);
 629                 wps->dh_pubkey = wpabuf_zeropad(wps->dh_pubkey, 192);
 630                 if (wps->dh_ctx == NULL || wps->dh_pubkey == NULL) {
 631                         wpa_printf(MSG_ERROR, "WPS: Failed to initialize "
 632                                    "Diffie-Hellman handshake");
 633                         return -1;
 634                 }
 635         }
 636
 637         if (wps->oob_conf.oob_method == OOB_METHOD_CRED)
 638                 wpas_clear_wps(wpa_s);
 639
 640         if (wps_process_oob(wps, oob_dev, 0) < 0)
 641                 return -1;
 642
 643         if ((wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E ||
 644              wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_R) &&
 645             wpas_wps_start_pin(wpa_s, NULL,
 646                                wpabuf_head(wps->oob_conf.dev_password)) < 0)
 647                         return -1;
 648
 649         return 0;
 650 }
 651 #endif /* CONFIG_WPS_OOB */
 652
 653
 654 int wpas_wps_start_reg(struct wpa_supplicant *wpa_s, const u8 *bssid,
 655                        const char *pin, struct wps_new_ap_settings *settings)
 656 {
 657         struct wpa_ssid *ssid;
 658         char val[200];
 659         char *pos, *end;
 660         int res;
 661
 662         if (!pin)
 663                 return -1;
 664         wpas_clear_wps(wpa_s);
 665         ssid = wpas_wps_add_network(wpa_s, 1, bssid);
 666         if (ssid == NULL)
 667                 return -1;
 668         pos = val;
 669         end = pos + sizeof(val);
 670         res = os_snprintf(pos, end - pos, "\"pin=%s", pin);
 671         if (res < 0 || res >= end - pos)
 672                 return -1;
 673         pos += res;
 674         if (settings) {
 675                 res = os_snprintf(pos, end - pos, " new_ssid=%s new_auth=%s "
 676                                   "new_encr=%s new_key=%s",
 677                                   settings->ssid_hex, settings->auth,
 678                                   settings->encr, settings->key_hex);
 679                 if (res < 0 || res >= end - pos)
 680                         return -1;
 681                 pos += res;
 682         }
 683         res = os_snprintf(pos, end - pos, "\"");
 684         if (res < 0 || res >= end - pos)
 685                 return -1;
 686         wpa_config_set(ssid, "phase1", val, 0);
 687         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 688                                wpa_s, NULL);
 689         wpas_wps_reassoc(wpa_s, ssid);
 690         return 0;
 691 }
 692
 693
 694 static int wpas_wps_new_psk_cb(void *ctx, const u8 *mac_addr, const u8 *psk,
 695                                size_t psk_len)
 696 {
 697         wpa_printf(MSG_DEBUG, "WPS: Received new WPA/WPA2-PSK from WPS for "
 698                    "STA " MACSTR, MAC2STR(mac_addr));
 699         wpa_hexdump_key(MSG_DEBUG, "Per-device PSK", psk, psk_len);
 700
 701         /* TODO */
 702
 703         return 0;
 704 }
 705
 706
 707 static void wpas_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
 708                                    const struct wps_device_data *dev)
 709 {
 710         char uuid[40], txt[400];
 711         int len;
 712         if (uuid_bin2str(uuid_e, uuid, sizeof(uuid)))
 713                 return;
 714         wpa_printf(MSG_DEBUG, "WPS: PIN needed for UUID-E %s", uuid);
 715         len = os_snprintf(txt, sizeof(txt), "WPS-EVENT-PIN-NEEDED %s " MACSTR
 716                           " [%s|%s|%s|%s|%s|%d-%08X-%d]",
 717                           uuid, MAC2STR(dev->mac_addr), dev->device_name,
 718                           dev->manufacturer, dev->model_name,
 719                           dev->model_number, dev->serial_number,
 720                           dev->categ, dev->oui, dev->sub_categ);
 721         if (len > 0 && len < (int) sizeof(txt))
 722                 wpa_printf(MSG_INFO, "%s", txt);
 723 }
 724
 725
 726 int wpas_wps_init(struct wpa_supplicant *wpa_s)
 727 {
 728         struct wps_context *wps;
 729         struct wps_registrar_config rcfg;
 730
 731         wps = os_zalloc(sizeof(*wps));
 732         if (wps == NULL)
 733                 return -1;
 734
 735         wps->cred_cb = wpa_supplicant_wps_cred;
 736         wps->event_cb = wpa_supplicant_wps_event;
 737         wps->cb_ctx = wpa_s;
 738
 739         wps->dev.device_name = wpa_s->conf->device_name;
 740         wps->dev.manufacturer = wpa_s->conf->manufacturer;
 741         wps->dev.model_name = wpa_s->conf->model_name;
 742         wps->dev.model_number = wpa_s->conf->model_number;
 743         wps->dev.serial_number = wpa_s->conf->serial_number;
 744         if (wpa_s->conf->device_type) {
 745                 char *pos;
 746                 u8 oui[4];
 747                 /* <categ>-<OUI>-<subcateg> */
 748                 wps->dev.categ = atoi(wpa_s->conf->device_type);
 749                 pos = os_strchr(wpa_s->conf->device_type, '-');
 750                 if (pos == NULL) {
 751                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
 752                         os_free(wps);
 753                         return -1;
 754                 }
 755                 pos++;
 756                 if (hexstr2bin(pos, oui, 4)) {
 757                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type OUI");
 758                         os_free(wps);
 759                         return -1;
 760                 }
 761                 wps->dev.oui = WPA_GET_BE32(oui);
 762                 pos = os_strchr(pos, '-');
 763                 if (pos == NULL) {
 764                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
 765                         os_free(wps);
 766                         return -1;
 767                 }
 768                 pos++;
 769                 wps->dev.sub_categ = atoi(pos);
 770         }
 771         wps->dev.os_version = WPA_GET_BE32(wpa_s->conf->os_version);
 772         wps->dev.rf_bands = WPS_RF_24GHZ | WPS_RF_50GHZ; /* TODO: config */
 773         os_memcpy(wps->dev.mac_addr, wpa_s->own_addr, ETH_ALEN);
 774         if (is_nil_uuid(wpa_s->conf->uuid)) {
 775                 uuid_gen_mac_addr(wpa_s->own_addr, wps->uuid);
 776                 wpa_hexdump(MSG_DEBUG, "WPS: UUID based on MAC address",
 777                             wps->uuid, WPS_UUID_LEN);
 778         } else
 779                 os_memcpy(wps->uuid, wpa_s->conf->uuid, WPS_UUID_LEN);
 780
 781         wps->auth_types = WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK;
 782         wps->encr_types = WPS_ENCR_AES | WPS_ENCR_TKIP;
 783
 784         os_memset(&rcfg, 0, sizeof(rcfg));
 785         rcfg.new_psk_cb = wpas_wps_new_psk_cb;
 786         rcfg.pin_needed_cb = wpas_wps_pin_needed_cb;
 787         rcfg.cb_ctx = wpa_s;
 788
 789         wps->registrar = wps_registrar_init(wps, &rcfg);
 790         if (wps->registrar == NULL) {
 791                 wpa_printf(MSG_DEBUG, "Failed to initialize WPS Registrar");
 792                 os_free(wps);
 793                 return -1;
 794         }
 795
 796         wpa_s->wps = wps;
 797
 798         return 0;
 799 }
 800
 801
 802 void wpas_wps_deinit(struct wpa_supplicant *wpa_s)
 803 {
 804         eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);
 805
 806         if (wpa_s->wps == NULL)
 807                 return;
 808
 809         wps_registrar_deinit(wpa_s->wps->registrar);
 810         wpabuf_free(wpa_s->wps->dh_pubkey);
 811         wpabuf_free(wpa_s->wps->dh_privkey);
 812         wpabuf_free(wpa_s->wps->oob_conf.pubkey_hash);
 813         wpabuf_free(wpa_s->wps->oob_conf.dev_password);
 814         os_free(wpa_s->wps->network_key);
 815         os_free(wpa_s->wps);
 816         wpa_s->wps = NULL;
 817
 818         wps_er_deinit(wpa_s->wps_er);
 819         wpa_s->wps_er = NULL;
 820 }
 821
 822
 823 int wpas_wps_ssid_bss_match(struct wpa_supplicant *wpa_s,
 824                             struct wpa_ssid *ssid, struct wpa_scan_res *bss)
 825 {
 826         struct wpabuf *wps_ie;
 827
 828         if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
 829                 return -1;
 830
 831         wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 832         if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
 833                 if (!wps_ie) {
 834                         wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
 835                         return 0;
 836                 }
 837
 838                 if (!wps_is_selected_pbc_registrar(wps_ie)) {
 839                         wpa_printf(MSG_DEBUG, "   skip - WPS AP "
 840                                    "without active PBC Registrar");
 841                         wpabuf_free(wps_ie);
 842                         return 0;
 843                 }
 844
 845                 /* TODO: overlap detection */
 846                 wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
 847                            "(Active PBC)");
 848                 wpabuf_free(wps_ie);
 849                 return 1;
 850         }
 851
 852         if (eap_is_wps_pin_enrollee(&ssid->eap)) {
 853                 if (!wps_ie) {
 854                         wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
 855                         return 0;
 856                 }
 857
 858                 /*
 859                  * Start with WPS APs that advertise active PIN Registrar and
 860                  * allow any WPS AP after third scan since some APs do not set
 861                  * Selected Registrar attribute properly when using external
 862                  * Registrar.
 863                  */
 864                 if (!wps_is_selected_pin_registrar(wps_ie)) {
 865                         if (wpa_s->scan_runs < WPS_PIN_SCAN_IGNORE_SEL_REG) {
 866                                 wpa_printf(MSG_DEBUG, "   skip - WPS AP "
 867                                            "without active PIN Registrar");
 868                                 wpabuf_free(wps_ie);
 869                                 return 0;
 870                         }
 871                         wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
 872                 } else {
 873                         wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
 874                                    "(Active PIN)");
 875                 }
 876                 wpabuf_free(wps_ie);
 877                 return 1;
 878         }
 879
 880         if (wps_ie) {
 881                 wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
 882                 wpabuf_free(wps_ie);
 883                 return 1;
 884         }
 885
 886         return -1;
 887 }
 888
 889
 890 int wpas_wps_ssid_wildcard_ok(struct wpa_supplicant *wpa_s,
 891                               struct wpa_ssid *ssid,
 892                               struct wpa_scan_res *bss)
 893 {
 894         struct wpabuf *wps_ie = NULL;
 895         int ret = 0;
 896
 897         if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
 898                 wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 899                 if (wps_ie && wps_is_selected_pbc_registrar(wps_ie)) {
 900                         /* allow wildcard SSID for WPS PBC */
 901                         ret = 1;
 902                 }
 903         } else if (eap_is_wps_pin_enrollee(&ssid->eap)) {
 904                 wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 905                 if (wps_ie &&
 906                     (wps_is_selected_pin_registrar(wps_ie) ||
 907                      wpa_s->scan_runs >= WPS_PIN_SCAN_IGNORE_SEL_REG)) {
 908                         /* allow wildcard SSID for WPS PIN */
 909                         ret = 1;
 910                 }
 911         }
 912
 913         if (!ret && ssid->bssid_set &&
 914             os_memcmp(ssid->bssid, bss->bssid, ETH_ALEN) == 0) {
 915                 /* allow wildcard SSID due to hardcoded BSSID match */
 916                 ret = 1;
 917         }
 918
 919         wpabuf_free(wps_ie);
 920
 921         return ret;
 922 }
 923
 924
 925 int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 926                               struct wpa_scan_res *selected,
 927                               struct wpa_ssid *ssid)
 928 {
 929         const u8 *sel_uuid, *uuid;
 930         size_t i;
 931         struct wpabuf *wps_ie;
 932         int ret = 0;
 933
 934         if (!eap_is_wps_pbc_enrollee(&ssid->eap))
 935                 return 0;
 936
 937         /* Make sure that only one AP is in active PBC mode */
 938         wps_ie = wpa_scan_get_vendor_ie_multi(selected, WPS_IE_VENDOR_TYPE);
 939         if (wps_ie)
 940                 sel_uuid = wps_get_uuid_e(wps_ie);
 941         else
 942                 sel_uuid = NULL;
 943
 944         for (i = 0; i < wpa_s->scan_res->num; i++) {
 945                 struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
 946                 struct wpabuf *ie;
 947                 if (bss == selected)
 948                         continue;
 949                 ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 950                 if (!ie)
 951                         continue;
 952                 if (!wps_is_selected_pbc_registrar(ie)) {
 953                         wpabuf_free(ie);
 954                         continue;
 955                 }
 956                 uuid = wps_get_uuid_e(ie);
 957                 if (sel_uuid == NULL || uuid == NULL ||
 958                     os_memcmp(sel_uuid, uuid, 16) != 0) {
 959                         ret = 1; /* PBC overlap */
 960                         wpabuf_free(ie);
 961                         break;
 962                 }
 963
 964                 /* TODO: verify that this is reasonable dual-band situation */
 965
 966                 wpabuf_free(ie);
 967         }
 968
 969         wpabuf_free(wps_ie);
 970
 971         return ret;
 972 }
 973
 974
 975 void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s)
 976 {
 977         size_t i;
 978
 979         if (wpa_s->disconnected || wpa_s->wpa_state >= WPA_ASSOCIATED)
 980                 return;
 981
 982         for (i = 0; i < wpa_s->scan_res->num; i++) {
 983                 struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
 984                 struct wpabuf *ie;
 985                 ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 986                 if (!ie)
 987                         continue;
 988                 if (wps_is_selected_pbc_registrar(ie))
 989                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PBC);
 990                 else if (wps_is_selected_pin_registrar(ie))
 991                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PIN);
 992                 else
 993                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE);
 994                 wpabuf_free(ie);
 995                 break;
 996         }
 997 }
 998
 999
1000 int wpas_wps_searching(struct wpa_supplicant *wpa_s)
1001 {
1002         struct wpa_ssid *ssid;
1003
1004         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1005                 if ((ssid->key_mgmt & WPA_KEY_MGMT_WPS) && !ssid->disabled)
1006                         return 1;
1007         }
1008
1009         return 0;
1010 }
1011
1012
1013 int wpas_wps_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
1014                               char *end)
1015 {
1016         struct wpabuf *wps_ie;
1017         int ret;
1018
1019         wps_ie = ieee802_11_vendor_ie_concat(ies, ies_len, WPS_DEV_OUI_WFA);
1020         if (wps_ie == NULL)
1021                 return 0;
1022
1023         ret = wps_attr_text(wps_ie, buf, end);
1024         wpabuf_free(wps_ie);
1025         return ret;
1026 }
1027
1028
1029 int wpas_wps_er_start(struct wpa_supplicant *wpa_s)
1030 {
1031 #ifdef CONFIG_WPS_ER
1032         if (wpa_s->wps_er) {
1033                 /* TODO: re-send ctrl_iface events for current data? */
1034                 return 0;
1035         }
1036         wpa_s->wps_er = wps_er_init(wpa_s->wps, wpa_s->ifname);
1037         if (wpa_s->wps_er == NULL)
1038                 return -1;
1039         return 0;
1040 #else /* CONFIG_WPS_ER */
1041         return 0;
1042 #endif /* CONFIG_WPS_ER */
1043 }
1044
1045
1046 int wpas_wps_er_stop(struct wpa_supplicant *wpa_s)
1047 {
1048 #ifdef CONFIG_WPS_ER
1049         wps_er_deinit(wpa_s->wps_er);
1050         wpa_s->wps_er = NULL;
1051 #endif /* CONFIG_WPS_ER */
1052         return 0;
1053 }