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         }
 430 }
 431
 432
 433 enum wps_request_type wpas_wps_get_req_type(struct wpa_ssid *ssid)
 434 {
 435         if (eap_is_wps_pbc_enrollee(&ssid->eap) ||
 436             eap_is_wps_pin_enrollee(&ssid->eap))
 437                 return WPS_REQ_ENROLLEE;
 438         else
 439                 return WPS_REQ_REGISTRAR;
 440 }
 441
 442
 443 static void wpas_clear_wps(struct wpa_supplicant *wpa_s)
 444 {
 445         int id;
 446         struct wpa_ssid *ssid, *remove_ssid = NULL;
 447
 448         eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);
 449
 450         /* Remove any existing WPS network from configuration */
 451         ssid = wpa_s->conf->ssid;
 452         while (ssid) {
 453                 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 454                         if (ssid == wpa_s->current_ssid) {
 455                                 wpa_s->current_ssid = NULL;
 456                                 if (ssid != NULL)
 457                                         wpas_notify_network_changed(wpa_s);
 458                         }
 459                         id = ssid->id;
 460                         remove_ssid = ssid;
 461                 } else
 462                         id = -1;
 463                 ssid = ssid->next;
 464                 if (id >= 0) {
 465                         wpas_notify_network_removed(wpa_s, remove_ssid);
 466                         wpa_config_remove_network(wpa_s->conf, id);
 467                 }
 468         }
 469 }
 470
 471
 472 static void wpas_wps_timeout(void *eloop_ctx, void *timeout_ctx)
 473 {
 474         struct wpa_supplicant *wpa_s = eloop_ctx;
 475         wpa_printf(MSG_INFO, WPS_EVENT_TIMEOUT "Requested operation timed "
 476                    "out");
 477         wpas_clear_wps(wpa_s);
 478 }
 479
 480
 481 static struct wpa_ssid * wpas_wps_add_network(struct wpa_supplicant *wpa_s,
 482                                               int registrar, const u8 *bssid)
 483 {
 484         struct wpa_ssid *ssid;
 485
 486         ssid = wpa_config_add_network(wpa_s->conf);
 487         if (ssid == NULL)
 488                 return NULL;
 489         wpas_notify_network_added(wpa_s, ssid);
 490         wpa_config_set_network_defaults(ssid);
 491         if (wpa_config_set(ssid, "key_mgmt", "WPS", 0) < 0 ||
 492             wpa_config_set(ssid, "eap", "WSC", 0) < 0 ||
 493             wpa_config_set(ssid, "identity", registrar ?
 494                            "\"" WSC_ID_REGISTRAR "\"" :
 495                            "\"" WSC_ID_ENROLLEE "\"", 0) < 0) {
 496                 wpas_notify_network_removed(wpa_s, ssid);
 497                 wpa_config_remove_network(wpa_s->conf, ssid->id);
 498                 return NULL;
 499         }
 500
 501         if (bssid) {
 502                 size_t i;
 503                 struct wpa_scan_res *res;
 504
 505                 os_memcpy(ssid->bssid, bssid, ETH_ALEN);
 506                 ssid->bssid_set = 1;
 507
 508                 /* Try to get SSID from scan results */
 509                 if (wpa_s->scan_res == NULL &&
 510                     wpa_supplicant_get_scan_results(wpa_s) < 0)
 511                         return ssid; /* Could not find any scan results */
 512
 513                 for (i = 0; i < wpa_s->scan_res->num; i++) {
 514                         const u8 *ie;
 515
 516                         res = wpa_s->scan_res->res[i];
 517                         if (os_memcmp(bssid, res->bssid, ETH_ALEN) != 0)
 518                                 continue;
 519
 520                         ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
 521                         if (ie == NULL)
 522                                 break;
 523                         os_free(ssid->ssid);
 524                         ssid->ssid = os_malloc(ie[1]);
 525                         if (ssid->ssid == NULL)
 526                                 break;
 527                         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 528                         ssid->ssid_len = ie[1];
 529                         break;
 530                 }
 531         }
 532
 533         return ssid;
 534 }
 535
 536
 537 static void wpas_wps_reassoc(struct wpa_supplicant *wpa_s,
 538                              struct wpa_ssid *selected)
 539 {
 540         struct wpa_ssid *ssid;
 541
 542         /* Mark all other networks disabled and trigger reassociation */
 543         ssid = wpa_s->conf->ssid;
 544         while (ssid) {
 545                 int was_disabled = ssid->disabled;
 546                 ssid->disabled = ssid != selected;
 547                 if (was_disabled != ssid->disabled)
 548                         wpas_notify_network_enabled_changed(wpa_s, ssid);
 549                 ssid = ssid->next;
 550         }
 551         wpa_s->disconnected = 0;
 552         wpa_s->reassociate = 1;
 553         wpa_s->scan_runs = 0;
 554         wpa_s->wps_success = 0;
 555         wpa_s->blacklist_cleared = 0;
 556         wpa_supplicant_req_scan(wpa_s, 0, 0);
 557 }
 558
 559
 560 int wpas_wps_start_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
 561 {
 562         struct wpa_ssid *ssid;
 563         wpas_clear_wps(wpa_s);
 564         ssid = wpas_wps_add_network(wpa_s, 0, bssid);
 565         if (ssid == NULL)
 566                 return -1;
 567         wpa_config_set(ssid, "phase1", "\"pbc=1\"", 0);
 568         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 569                                wpa_s, NULL);
 570         wpas_wps_reassoc(wpa_s, ssid);
 571         return 0;
 572 }
 573
 574
 575 int wpas_wps_start_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
 576                        const char *pin)
 577 {
 578         struct wpa_ssid *ssid;
 579         char val[128];
 580         unsigned int rpin = 0;
 581
 582         wpas_clear_wps(wpa_s);
 583         ssid = wpas_wps_add_network(wpa_s, 0, bssid);
 584         if (ssid == NULL)
 585                 return -1;
 586         if (pin)
 587                 os_snprintf(val, sizeof(val), "\"pin=%s\"", pin);
 588         else {
 589                 rpin = wps_generate_pin();
 590                 os_snprintf(val, sizeof(val), "\"pin=%08d\"", rpin);
 591         }
 592         wpa_config_set(ssid, "phase1", val, 0);
 593         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 594                                wpa_s, NULL);
 595         wpas_wps_reassoc(wpa_s, ssid);
 596         return rpin;
 597 }
 598
 599
 600 #ifdef CONFIG_WPS_OOB
 601 int wpas_wps_start_oob(struct wpa_supplicant *wpa_s, char *device_type,
 602                        char *path, char *method, char *name)
 603 {
 604         struct wps_context *wps = wpa_s->wps;
 605         struct oob_device_data *oob_dev;
 606
 607         oob_dev = wps_get_oob_device(device_type);
 608         if (oob_dev == NULL)
 609                 return -1;
 610         oob_dev->device_path = path;
 611         oob_dev->device_name = name;
 612         wps->oob_conf.oob_method = wps_get_oob_method(method);
 613
 614         if (wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E) {
 615                 /*
 616                  * Use pre-configured DH keys in order to be able to write the
 617                  * key hash into the OOB file.
 618                  */
 619                 wpabuf_free(wps->dh_pubkey);
 620                 wpabuf_free(wps->dh_privkey);
 621                 wps->dh_privkey = NULL;
 622                 wps->dh_pubkey = NULL;
 623                 dh5_free(wps->dh_ctx);
 624                 wps->dh_ctx = dh5_init(&wps->dh_privkey, &wps->dh_pubkey);
 625                 wps->dh_pubkey = wpabuf_zeropad(wps->dh_pubkey, 192);
 626                 if (wps->dh_ctx == NULL || wps->dh_pubkey == NULL) {
 627                         wpa_printf(MSG_ERROR, "WPS: Failed to initialize "
 628                                    "Diffie-Hellman handshake");
 629                         return -1;
 630                 }
 631         }
 632
 633         if (wps->oob_conf.oob_method == OOB_METHOD_CRED)
 634                 wpas_clear_wps(wpa_s);
 635
 636         if (wps_process_oob(wps, oob_dev, 0) < 0)
 637                 return -1;
 638
 639         if ((wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_E ||
 640              wps->oob_conf.oob_method == OOB_METHOD_DEV_PWD_R) &&
 641             wpas_wps_start_pin(wpa_s, NULL,
 642                                wpabuf_head(wps->oob_conf.dev_password)) < 0)
 643                         return -1;
 644
 645         return 0;
 646 }
 647 #endif /* CONFIG_WPS_OOB */
 648
 649
 650 int wpas_wps_start_reg(struct wpa_supplicant *wpa_s, const u8 *bssid,
 651                        const char *pin, struct wps_new_ap_settings *settings)
 652 {
 653         struct wpa_ssid *ssid;
 654         char val[200];
 655         char *pos, *end;
 656         int res;
 657
 658         if (!pin)
 659                 return -1;
 660         wpas_clear_wps(wpa_s);
 661         ssid = wpas_wps_add_network(wpa_s, 1, bssid);
 662         if (ssid == NULL)
 663                 return -1;
 664         pos = val;
 665         end = pos + sizeof(val);
 666         res = os_snprintf(pos, end - pos, "\"pin=%s", pin);
 667         if (res < 0 || res >= end - pos)
 668                 return -1;
 669         pos += res;
 670         if (settings) {
 671                 res = os_snprintf(pos, end - pos, " new_ssid=%s new_auth=%s "
 672                                   "new_encr=%s new_key=%s",
 673                                   settings->ssid_hex, settings->auth,
 674                                   settings->encr, settings->key_hex);
 675                 if (res < 0 || res >= end - pos)
 676                         return -1;
 677                 pos += res;
 678         }
 679         res = os_snprintf(pos, end - pos, "\"");
 680         if (res < 0 || res >= end - pos)
 681                 return -1;
 682         wpa_config_set(ssid, "phase1", val, 0);
 683         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wpas_wps_timeout,
 684                                wpa_s, NULL);
 685         wpas_wps_reassoc(wpa_s, ssid);
 686         return 0;
 687 }
 688
 689
 690 static int wpas_wps_new_psk_cb(void *ctx, const u8 *mac_addr, const u8 *psk,
 691                                size_t psk_len)
 692 {
 693         wpa_printf(MSG_DEBUG, "WPS: Received new WPA/WPA2-PSK from WPS for "
 694                    "STA " MACSTR, MAC2STR(mac_addr));
 695         wpa_hexdump_key(MSG_DEBUG, "Per-device PSK", psk, psk_len);
 696
 697         /* TODO */
 698
 699         return 0;
 700 }
 701
 702
 703 static void wpas_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
 704                                    const struct wps_device_data *dev)
 705 {
 706         char uuid[40], txt[400];
 707         int len;
 708         if (uuid_bin2str(uuid_e, uuid, sizeof(uuid)))
 709                 return;
 710         wpa_printf(MSG_DEBUG, "WPS: PIN needed for UUID-E %s", uuid);
 711         len = os_snprintf(txt, sizeof(txt), "WPS-EVENT-PIN-NEEDED %s " MACSTR
 712                           " [%s|%s|%s|%s|%s|%d-%08X-%d]",
 713                           uuid, MAC2STR(dev->mac_addr), dev->device_name,
 714                           dev->manufacturer, dev->model_name,
 715                           dev->model_number, dev->serial_number,
 716                           dev->categ, dev->oui, dev->sub_categ);
 717         if (len > 0 && len < (int) sizeof(txt))
 718                 wpa_printf(MSG_INFO, "%s", txt);
 719 }
 720
 721
 722 int wpas_wps_init(struct wpa_supplicant *wpa_s)
 723 {
 724         struct wps_context *wps;
 725         struct wps_registrar_config rcfg;
 726
 727         wps = os_zalloc(sizeof(*wps));
 728         if (wps == NULL)
 729                 return -1;
 730
 731         wps->cred_cb = wpa_supplicant_wps_cred;
 732         wps->event_cb = wpa_supplicant_wps_event;
 733         wps->cb_ctx = wpa_s;
 734
 735         wps->dev.device_name = wpa_s->conf->device_name;
 736         wps->dev.manufacturer = wpa_s->conf->manufacturer;
 737         wps->dev.model_name = wpa_s->conf->model_name;
 738         wps->dev.model_number = wpa_s->conf->model_number;
 739         wps->dev.serial_number = wpa_s->conf->serial_number;
 740         if (wpa_s->conf->device_type) {
 741                 char *pos;
 742                 u8 oui[4];
 743                 /* <categ>-<OUI>-<subcateg> */
 744                 wps->dev.categ = atoi(wpa_s->conf->device_type);
 745                 pos = os_strchr(wpa_s->conf->device_type, '-');
 746                 if (pos == NULL) {
 747                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
 748                         os_free(wps);
 749                         return -1;
 750                 }
 751                 pos++;
 752                 if (hexstr2bin(pos, oui, 4)) {
 753                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type OUI");
 754                         os_free(wps);
 755                         return -1;
 756                 }
 757                 wps->dev.oui = WPA_GET_BE32(oui);
 758                 pos = os_strchr(pos, '-');
 759                 if (pos == NULL) {
 760                         wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
 761                         os_free(wps);
 762                         return -1;
 763                 }
 764                 pos++;
 765                 wps->dev.sub_categ = atoi(pos);
 766         }
 767         wps->dev.os_version = WPA_GET_BE32(wpa_s->conf->os_version);
 768         wps->dev.rf_bands = WPS_RF_24GHZ | WPS_RF_50GHZ; /* TODO: config */
 769         os_memcpy(wps->dev.mac_addr, wpa_s->own_addr, ETH_ALEN);
 770         if (is_nil_uuid(wpa_s->conf->uuid)) {
 771                 uuid_gen_mac_addr(wpa_s->own_addr, wps->uuid);
 772                 wpa_hexdump(MSG_DEBUG, "WPS: UUID based on MAC address",
 773                             wps->uuid, WPS_UUID_LEN);
 774         } else
 775                 os_memcpy(wps->uuid, wpa_s->conf->uuid, WPS_UUID_LEN);
 776
 777         wps->auth_types = WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK;
 778         wps->encr_types = WPS_ENCR_AES | WPS_ENCR_TKIP;
 779
 780         os_memset(&rcfg, 0, sizeof(rcfg));
 781         rcfg.new_psk_cb = wpas_wps_new_psk_cb;
 782         rcfg.pin_needed_cb = wpas_wps_pin_needed_cb;
 783         rcfg.cb_ctx = wpa_s;
 784
 785         wps->registrar = wps_registrar_init(wps, &rcfg);
 786         if (wps->registrar == NULL) {
 787                 wpa_printf(MSG_DEBUG, "Failed to initialize WPS Registrar");
 788                 os_free(wps);
 789                 return -1;
 790         }
 791
 792         wpa_s->wps = wps;
 793
 794         return 0;
 795 }
 796
 797
 798 void wpas_wps_deinit(struct wpa_supplicant *wpa_s)
 799 {
 800         eloop_cancel_timeout(wpas_wps_timeout, wpa_s, NULL);
 801
 802         if (wpa_s->wps == NULL)
 803                 return;
 804
 805         wps_registrar_deinit(wpa_s->wps->registrar);
 806         wpabuf_free(wpa_s->wps->dh_pubkey);
 807         wpabuf_free(wpa_s->wps->dh_privkey);
 808         wpabuf_free(wpa_s->wps->oob_conf.pubkey_hash);
 809         wpabuf_free(wpa_s->wps->oob_conf.dev_password);
 810         os_free(wpa_s->wps->network_key);
 811         os_free(wpa_s->wps);
 812         wpa_s->wps = NULL;
 813 }
 814
 815
 816 int wpas_wps_ssid_bss_match(struct wpa_supplicant *wpa_s,
 817                             struct wpa_ssid *ssid, struct wpa_scan_res *bss)
 818 {
 819         struct wpabuf *wps_ie;
 820
 821         if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
 822                 return -1;
 823
 824         wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 825         if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
 826                 if (!wps_ie) {
 827                         wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
 828                         return 0;
 829                 }
 830
 831                 if (!wps_is_selected_pbc_registrar(wps_ie)) {
 832                         wpa_printf(MSG_DEBUG, "   skip - WPS AP "
 833                                    "without active PBC Registrar");
 834                         wpabuf_free(wps_ie);
 835                         return 0;
 836                 }
 837
 838                 /* TODO: overlap detection */
 839                 wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
 840                            "(Active PBC)");
 841                 wpabuf_free(wps_ie);
 842                 return 1;
 843         }
 844
 845         if (eap_is_wps_pin_enrollee(&ssid->eap)) {
 846                 if (!wps_ie) {
 847                         wpa_printf(MSG_DEBUG, "   skip - non-WPS AP");
 848                         return 0;
 849                 }
 850
 851                 /*
 852                  * Start with WPS APs that advertise active PIN Registrar and
 853                  * allow any WPS AP after third scan since some APs do not set
 854                  * Selected Registrar attribute properly when using external
 855                  * Registrar.
 856                  */
 857                 if (!wps_is_selected_pin_registrar(wps_ie)) {
 858                         if (wpa_s->scan_runs < WPS_PIN_SCAN_IGNORE_SEL_REG) {
 859                                 wpa_printf(MSG_DEBUG, "   skip - WPS AP "
 860                                            "without active PIN Registrar");
 861                                 wpabuf_free(wps_ie);
 862                                 return 0;
 863                         }
 864                         wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
 865                 } else {
 866                         wpa_printf(MSG_DEBUG, "   selected based on WPS IE "
 867                                    "(Active PIN)");
 868                 }
 869                 wpabuf_free(wps_ie);
 870                 return 1;
 871         }
 872
 873         if (wps_ie) {
 874                 wpa_printf(MSG_DEBUG, "   selected based on WPS IE");
 875                 wpabuf_free(wps_ie);
 876                 return 1;
 877         }
 878
 879         return -1;
 880 }
 881
 882
 883 int wpas_wps_ssid_wildcard_ok(struct wpa_supplicant *wpa_s,
 884                               struct wpa_ssid *ssid,
 885                               struct wpa_scan_res *bss)
 886 {
 887         struct wpabuf *wps_ie = NULL;
 888         int ret = 0;
 889
 890         if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
 891                 wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 892                 if (wps_ie && wps_is_selected_pbc_registrar(wps_ie)) {
 893                         /* allow wildcard SSID for WPS PBC */
 894                         ret = 1;
 895                 }
 896         } else if (eap_is_wps_pin_enrollee(&ssid->eap)) {
 897                 wps_ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 898                 if (wps_ie &&
 899                     (wps_is_selected_pin_registrar(wps_ie) ||
 900                      wpa_s->scan_runs >= WPS_PIN_SCAN_IGNORE_SEL_REG)) {
 901                         /* allow wildcard SSID for WPS PIN */
 902                         ret = 1;
 903                 }
 904         }
 905
 906         if (!ret && ssid->bssid_set &&
 907             os_memcmp(ssid->bssid, bss->bssid, ETH_ALEN) == 0) {
 908                 /* allow wildcard SSID due to hardcoded BSSID match */
 909                 ret = 1;
 910         }
 911
 912         wpabuf_free(wps_ie);
 913
 914         return ret;
 915 }
 916
 917
 918 int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 919                               struct wpa_scan_res *selected,
 920                               struct wpa_ssid *ssid)
 921 {
 922         const u8 *sel_uuid, *uuid;
 923         size_t i;
 924         struct wpabuf *wps_ie;
 925         int ret = 0;
 926
 927         if (!eap_is_wps_pbc_enrollee(&ssid->eap))
 928                 return 0;
 929
 930         /* Make sure that only one AP is in active PBC mode */
 931         wps_ie = wpa_scan_get_vendor_ie_multi(selected, WPS_IE_VENDOR_TYPE);
 932         if (wps_ie)
 933                 sel_uuid = wps_get_uuid_e(wps_ie);
 934         else
 935                 sel_uuid = NULL;
 936
 937         for (i = 0; i < wpa_s->scan_res->num; i++) {
 938                 struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
 939                 struct wpabuf *ie;
 940                 if (bss == selected)
 941                         continue;
 942                 ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 943                 if (!ie)
 944                         continue;
 945                 if (!wps_is_selected_pbc_registrar(ie)) {
 946                         wpabuf_free(ie);
 947                         continue;
 948                 }
 949                 uuid = wps_get_uuid_e(ie);
 950                 if (sel_uuid == NULL || uuid == NULL ||
 951                     os_memcmp(sel_uuid, uuid, 16) != 0) {
 952                         ret = 1; /* PBC overlap */
 953                         wpabuf_free(ie);
 954                         break;
 955                 }
 956
 957                 /* TODO: verify that this is reasonable dual-band situation */
 958
 959                 wpabuf_free(ie);
 960         }
 961
 962         wpabuf_free(wps_ie);
 963
 964         return ret;
 965 }
 966
 967
 968 void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s)
 969 {
 970         size_t i;
 971
 972         if (wpa_s->disconnected || wpa_s->wpa_state >= WPA_ASSOCIATED)
 973                 return;
 974
 975         for (i = 0; i < wpa_s->scan_res->num; i++) {
 976                 struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
 977                 struct wpabuf *ie;
 978                 ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
 979                 if (!ie)
 980                         continue;
 981                 if (wps_is_selected_pbc_registrar(ie))
 982                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PBC);
 983                 else if (wps_is_selected_pin_registrar(ie))
 984                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PIN);
 985                 else
 986                         wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE);
 987                 wpabuf_free(ie);
 988                 break;
 989         }
 990 }
 991
 992
 993 int wpas_wps_searching(struct wpa_supplicant *wpa_s)
 994 {
 995         struct wpa_ssid *ssid;
 996
 997         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 998                 if ((ssid->key_mgmt & WPA_KEY_MGMT_WPS) && !ssid->disabled)
 999                         return 1;
1000         }
1001
1002         return 0;
1003 }
1004
1005
1006 int wpas_wps_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
1007                               char *end)
1008 {
1009         struct wpabuf *wps_ie;
1010         int ret;
1011
1012         wps_ie = ieee802_11_vendor_ie_concat(ies, ies_len, WPS_DEV_OUI_WFA);
1013         if (wps_ie == NULL)
1014                 return 0;
1015
1016         ret = wps_attr_text(wps_ie, buf, end);
1017         wpabuf_free(wps_ie);
1018         return ret;
1019 }