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