contrib/wpa/src/wps/wps_common.c

   1 /*
   2  * Wi-Fi Protected Setup - common functionality
   3  * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/aes_wrap.h"
  19 #include "crypto/crypto.h"
  20 #include "crypto/dh_group5.h"
  21 #include "crypto/sha1.h"
  22 #include "crypto/sha256.h"
  23 #include "wps_i.h"
  24 #include "wps_dev_attr.h"
  25
  26
  27 void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
  28              const char *label, u8 *res, size_t res_len)
  29 {
  30         u8 i_buf[4], key_bits[4];
  31         const u8 *addr[4];
  32         size_t len[4];
  33         int i, iter;
  34         u8 hash[SHA256_MAC_LEN], *opos;
  35         size_t left;
  36
  37         WPA_PUT_BE32(key_bits, res_len * 8);
  38
  39         addr[0] = i_buf;
  40         len[0] = sizeof(i_buf);
  41         addr[1] = label_prefix;
  42         len[1] = label_prefix_len;
  43         addr[2] = (const u8 *) label;
  44         len[2] = os_strlen(label);
  45         addr[3] = key_bits;
  46         len[3] = sizeof(key_bits);
  47
  48         iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
  49         opos = res;
  50         left = res_len;
  51
  52         for (i = 1; i <= iter; i++) {
  53                 WPA_PUT_BE32(i_buf, i);
  54                 hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
  55                 if (i < iter) {
  56                         os_memcpy(opos, hash, SHA256_MAC_LEN);
  57                         opos += SHA256_MAC_LEN;
  58                         left -= SHA256_MAC_LEN;
  59                 } else
  60                         os_memcpy(opos, hash, left);
  61         }
  62 }
  63
  64
  65 int wps_derive_keys(struct wps_data *wps)
  66 {
  67         struct wpabuf *pubkey, *dh_shared;
  68         u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
  69         const u8 *addr[3];
  70         size_t len[3];
  71         u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
  72
  73         if (wps->dh_privkey == NULL) {
  74                 wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
  75                 return -1;
  76         }
  77
  78         pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
  79         if (pubkey == NULL) {
  80                 wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
  81                 return -1;
  82         }
  83
  84         dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
  85         dh5_free(wps->dh_ctx);
  86         wps->dh_ctx = NULL;
  87         dh_shared = wpabuf_zeropad(dh_shared, 192);
  88         if (dh_shared == NULL) {
  89                 wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
  90                 return -1;
  91         }
  92
  93         /* Own DH private key is not needed anymore */
  94         wpabuf_free(wps->dh_privkey);
  95         wps->dh_privkey = NULL;
  96
  97         wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
  98
  99         /* DHKey = SHA-256(g^AB mod p) */
 100         addr[0] = wpabuf_head(dh_shared);
 101         len[0] = wpabuf_len(dh_shared);
 102         sha256_vector(1, addr, len, dhkey);
 103         wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
 104         wpabuf_free(dh_shared);
 105
 106         /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
 107         addr[0] = wps->nonce_e;
 108         len[0] = WPS_NONCE_LEN;
 109         addr[1] = wps->mac_addr_e;
 110         len[1] = ETH_ALEN;
 111         addr[2] = wps->nonce_r;
 112         len[2] = WPS_NONCE_LEN;
 113         hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
 114         wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
 115
 116         wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
 117                 keys, sizeof(keys));
 118         os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
 119         os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
 120         os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
 121                   WPS_EMSK_LEN);
 122
 123         wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
 124                         wps->authkey, WPS_AUTHKEY_LEN);
 125         wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
 126                         wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
 127         wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
 128
 129         return 0;
 130 }
 131
 132
 133 void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
 134                     size_t dev_passwd_len)
 135 {
 136         u8 hash[SHA256_MAC_LEN];
 137
 138         hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
 139                     (dev_passwd_len + 1) / 2, hash);
 140         os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
 141         hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
 142                     dev_passwd + (dev_passwd_len + 1) / 2,
 143                     dev_passwd_len / 2, hash);
 144         os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
 145
 146         wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
 147                               dev_passwd, dev_passwd_len);
 148         wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
 149         wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
 150 }
 151
 152
 153 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
 154                                           size_t encr_len)
 155 {
 156         struct wpabuf *decrypted;
 157         const size_t block_size = 16;
 158         size_t i;
 159         u8 pad;
 160         const u8 *pos;
 161
 162         /* AES-128-CBC */
 163         if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
 164         {
 165                 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
 166                 return NULL;
 167         }
 168
 169         decrypted = wpabuf_alloc(encr_len - block_size);
 170         if (decrypted == NULL)
 171                 return NULL;
 172
 173         wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
 174         wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
 175         if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
 176                                 wpabuf_len(decrypted))) {
 177                 wpabuf_free(decrypted);
 178                 return NULL;
 179         }
 180
 181         wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
 182                             decrypted);
 183
 184         pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
 185         pad = *pos;
 186         if (pad > wpabuf_len(decrypted)) {
 187                 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
 188                 wpabuf_free(decrypted);
 189                 return NULL;
 190         }
 191         for (i = 0; i < pad; i++) {
 192                 if (*pos-- != pad) {
 193                         wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
 194                                    "string");
 195                         wpabuf_free(decrypted);
 196                         return NULL;
 197                 }
 198         }
 199         decrypted->used -= pad;
 200
 201         return decrypted;
 202 }
 203
 204
 205 /**
 206  * wps_pin_checksum - Compute PIN checksum
 207  * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
 208  * Returns: Checksum digit
 209  */
 210 unsigned int wps_pin_checksum(unsigned int pin)
 211 {
 212         unsigned int accum = 0;
 213         while (pin) {
 214                 accum += 3 * (pin % 10);
 215                 pin /= 10;
 216                 accum += pin % 10;
 217                 pin /= 10;
 218         }
 219
 220         return (10 - accum % 10) % 10;
 221 }
 222
 223
 224 /**
 225  * wps_pin_valid - Check whether a PIN has a valid checksum
 226  * @pin: Eight digit PIN (i.e., including the checksum digit)
 227  * Returns: 1 if checksum digit is valid, or 0 if not
 228  */
 229 unsigned int wps_pin_valid(unsigned int pin)
 230 {
 231         return wps_pin_checksum(pin / 10) == (pin % 10);
 232 }
 233
 234
 235 /**
 236  * wps_generate_pin - Generate a random PIN
 237  * Returns: Eight digit PIN (i.e., including the checksum digit)
 238  */
 239 unsigned int wps_generate_pin(void)
 240 {
 241         unsigned int val;
 242
 243         /* Generate seven random digits for the PIN */
 244         if (os_get_random((unsigned char *) &val, sizeof(val)) < 0) {
 245                 struct os_time now;
 246                 os_get_time(&now);
 247                 val = os_random() ^ now.sec ^ now.usec;
 248         }
 249         val %= 10000000;
 250
 251         /* Append checksum digit */
 252         return val * 10 + wps_pin_checksum(val);
 253 }
 254
 255
 256 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg)
 257 {
 258         union wps_event_data data;
 259
 260         if (wps->event_cb == NULL)
 261                 return;
 262
 263         os_memset(&data, 0, sizeof(data));
 264         data.fail.msg = msg;
 265         wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
 266 }
 267
 268
 269 void wps_success_event(struct wps_context *wps)
 270 {
 271         if (wps->event_cb == NULL)
 272                 return;
 273
 274         wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, NULL);
 275 }
 276
 277
 278 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part)
 279 {
 280         union wps_event_data data;
 281
 282         if (wps->event_cb == NULL)
 283                 return;
 284
 285         os_memset(&data, 0, sizeof(data));
 286         data.pwd_auth_fail.enrollee = enrollee;
 287         data.pwd_auth_fail.part = part;
 288         wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
 289 }
 290
 291
 292 void wps_pbc_overlap_event(struct wps_context *wps)
 293 {
 294         if (wps->event_cb == NULL)
 295                 return;
 296
 297         wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
 298 }
 299
 300
 301 void wps_pbc_timeout_event(struct wps_context *wps)
 302 {
 303         if (wps->event_cb == NULL)
 304                 return;
 305
 306         wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
 307 }
 308
 309
 310 #ifdef CONFIG_WPS_OOB
 311
 312 static struct wpabuf * wps_get_oob_cred(struct wps_context *wps)
 313 {
 314         struct wps_data data;
 315         struct wpabuf *plain;
 316
 317         plain = wpabuf_alloc(500);
 318         if (plain == NULL) {
 319                 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
 320                            "credential");
 321                 return NULL;
 322         }
 323
 324         os_memset(&data, 0, sizeof(data));
 325         data.wps = wps;
 326         data.auth_type = wps->auth_types;
 327         data.encr_type = wps->encr_types;
 328         if (wps_build_version(plain) || wps_build_cred(&data, plain)) {
 329                 wpabuf_free(plain);
 330                 return NULL;
 331         }
 332
 333         return plain;
 334 }
 335
 336
 337 static struct wpabuf * wps_get_oob_dev_pwd(struct wps_context *wps)
 338 {
 339         struct wpabuf *data;
 340
 341         data = wpabuf_alloc(9 + WPS_OOB_DEVICE_PASSWORD_ATTR_LEN);
 342         if (data == NULL) {
 343                 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
 344                            "device password attribute");
 345                 return NULL;
 346         }
 347
 348         wpabuf_free(wps->oob_conf.dev_password);
 349         wps->oob_conf.dev_password =
 350                 wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
 351         if (wps->oob_conf.dev_password == NULL) {
 352                 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
 353                            "device password");
 354                 wpabuf_free(data);
 355                 return NULL;
 356         }
 357
 358         if (wps_build_version(data) ||
 359             wps_build_oob_dev_password(data, wps)) {
 360                 wpa_printf(MSG_ERROR, "WPS: Build OOB device password "
 361                            "attribute error");
 362                 wpabuf_free(data);
 363                 return NULL;
 364         }
 365
 366         return data;
 367 }
 368
 369
 370 static int wps_parse_oob_dev_pwd(struct wps_context *wps,
 371                                  struct wpabuf *data)
 372 {
 373         struct oob_conf_data *oob_conf = &wps->oob_conf;
 374         struct wps_parse_attr attr;
 375         const u8 *pos;
 376
 377         if (wps_parse_msg(data, &attr) < 0 ||
 378             attr.oob_dev_password == NULL) {
 379                 wpa_printf(MSG_ERROR, "WPS: OOB device password not found");
 380                 return -1;
 381         }
 382
 383         pos = attr.oob_dev_password;
 384
 385         oob_conf->pubkey_hash =
 386                 wpabuf_alloc_copy(pos, WPS_OOB_PUBKEY_HASH_LEN);
 387         if (oob_conf->pubkey_hash == NULL) {
 388                 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
 389                            "public key hash");
 390                 return -1;
 391         }
 392         pos += WPS_OOB_PUBKEY_HASH_LEN;
 393
 394         wps->oob_dev_pw_id = WPA_GET_BE16(pos);
 395         pos += sizeof(wps->oob_dev_pw_id);
 396
 397         oob_conf->dev_password =
 398                 wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
 399         if (oob_conf->dev_password == NULL) {
 400                 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
 401                            "device password");
 402                 return -1;
 403         }
 404         wpa_snprintf_hex_uppercase(wpabuf_put(oob_conf->dev_password,
 405                                    wpabuf_size(oob_conf->dev_password)),
 406                                    wpabuf_size(oob_conf->dev_password), pos,
 407                                    WPS_OOB_DEVICE_PASSWORD_LEN);
 408
 409         return 0;
 410 }
 411
 412
 413 static int wps_parse_oob_cred(struct wps_context *wps, struct wpabuf *data)
 414 {
 415         struct wpabuf msg;
 416         struct wps_parse_attr attr;
 417         size_t i;
 418
 419         if (wps_parse_msg(data, &attr) < 0 || attr.num_cred <= 0) {
 420                 wpa_printf(MSG_ERROR, "WPS: OOB credential not found");
 421                 return -1;
 422         }
 423
 424         for (i = 0; i < attr.num_cred; i++) {
 425                 struct wps_credential local_cred;
 426                 struct wps_parse_attr cattr;
 427
 428                 os_memset(&local_cred, 0, sizeof(local_cred));
 429                 wpabuf_set(&msg, attr.cred[i], attr.cred_len[i]);
 430                 if (wps_parse_msg(&msg, &cattr) < 0 ||
 431                     wps_process_cred(&cattr, &local_cred)) {
 432                         wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
 433                                    "credential");
 434                         return -1;
 435                 }
 436                 wps->cred_cb(wps->cb_ctx, &local_cred);
 437         }
 438
 439         return 0;
 440 }
 441
 442
 443 int wps_process_oob(struct wps_context *wps, struct oob_device_data *oob_dev,
 444                     int registrar)
 445 {
 446         struct wpabuf *data;
 447         int ret, write_f, oob_method = wps->oob_conf.oob_method;
 448         void *oob_priv;
 449
 450         write_f = oob_method == OOB_METHOD_DEV_PWD_E ? !registrar : registrar;
 451
 452         oob_priv = oob_dev->init_func(wps, oob_dev, registrar);
 453         if (oob_priv == NULL) {
 454                 wpa_printf(MSG_ERROR, "WPS: Failed to initialize OOB device");
 455                 return -1;
 456         }
 457
 458         if (write_f) {
 459                 if (oob_method == OOB_METHOD_CRED)
 460                         data = wps_get_oob_cred(wps);
 461                 else
 462                         data = wps_get_oob_dev_pwd(wps);
 463
 464                 ret = 0;
 465                 if (data == NULL || oob_dev->write_func(oob_priv, data) < 0)
 466                         ret = -1;
 467         } else {
 468                 data = oob_dev->read_func(oob_priv);
 469                 if (data == NULL)
 470                         ret = -1;
 471                 else {
 472                         if (oob_method == OOB_METHOD_CRED)
 473                                 ret = wps_parse_oob_cred(wps, data);
 474                         else
 475                                 ret = wps_parse_oob_dev_pwd(wps, data);
 476                 }
 477         }
 478         wpabuf_free(data);
 479         oob_dev->deinit_func(oob_priv);
 480
 481         if (ret < 0) {
 482                 wpa_printf(MSG_ERROR, "WPS: Failed to process OOB data");
 483                 return -1;
 484         }
 485
 486         return 0;
 487 }
 488
 489
 490 struct oob_device_data * wps_get_oob_device(char *device_type)
 491 {
 492 #ifdef CONFIG_WPS_UFD
 493         if (os_strstr(device_type, "ufd") != NULL)
 494                 return &oob_ufd_device_data;
 495 #endif /* CONFIG_WPS_UFD */
 496 #ifdef CONFIG_WPS_NFC
 497         if (os_strstr(device_type, "nfc") != NULL)
 498                 return &oob_nfc_device_data;
 499 #endif /* CONFIG_WPS_NFC */
 500
 501         return NULL;
 502 }
 503
 504
 505 #ifdef CONFIG_WPS_NFC
 506 struct oob_nfc_device_data * wps_get_oob_nfc_device(char *device_name)
 507 {
 508         if (device_name == NULL)
 509                 return NULL;
 510 #ifdef CONFIG_WPS_NFC_PN531
 511         if (os_strstr(device_name, "pn531") != NULL)
 512                 return &oob_nfc_pn531_device_data;
 513 #endif /* CONFIG_WPS_NFC_PN531 */
 514
 515         return NULL;
 516 }
 517 #endif /* CONFIG_WPS_NFC */
 518
 519
 520 int wps_get_oob_method(char *method)
 521 {
 522         if (os_strstr(method, "pin-e") != NULL)
 523                 return OOB_METHOD_DEV_PWD_E;
 524         if (os_strstr(method, "pin-r") != NULL)
 525                 return OOB_METHOD_DEV_PWD_R;
 526         if (os_strstr(method, "cred") != NULL)
 527                 return OOB_METHOD_CRED;
 528         return OOB_METHOD_UNKNOWN;
 529 }
 530
 531 #endif /* CONFIG_WPS_OOB */
 532
 533
 534 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
 535 {
 536         const char *pos;
 537
 538         /* <categ>-<OUI>-<subcateg> */
 539         WPA_PUT_BE16(dev_type, atoi(str));
 540         pos = os_strchr(str, '-');
 541         if (pos == NULL)
 542                 return -1;
 543         pos++;
 544         if (hexstr2bin(pos, &dev_type[2], 4))
 545                 return -1;
 546         pos = os_strchr(pos, '-');
 547         if (pos == NULL)
 548                 return -1;
 549         pos++;
 550         WPA_PUT_BE16(&dev_type[6], atoi(pos));
 551
 552
 553         return 0;
 554 }
 555
 556
 557 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
 558                             size_t buf_len)
 559 {
 560         int ret;
 561
 562         ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
 563                           WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
 564                           WPA_GET_BE16(&dev_type[6]));
 565         if (ret < 0 || (unsigned int) ret >= buf_len)
 566                 return NULL;
 567
 568         return buf;
 569 }
 570
 571
 572 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
 573 {
 574         const u8 *addr[2];
 575         size_t len[2];
 576         u8 hash[SHA1_MAC_LEN];
 577         u8 nsid[16] = {
 578                 0x52, 0x64, 0x80, 0xf8,
 579                 0xc9, 0x9b,
 580                 0x4b, 0xe5,
 581                 0xa6, 0x55,
 582                 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
 583         };
 584
 585         addr[0] = nsid;
 586         len[0] = sizeof(nsid);
 587         addr[1] = mac_addr;
 588         len[1] = 6;
 589         sha1_vector(2, addr, len, hash);
 590         os_memcpy(uuid, hash, 16);
 591
 592         /* Version: 5 = named-based version using SHA-1 */
 593         uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
 594
 595         /* Variant specified in RFC 4122 */
 596         uuid[8] = 0x80 | (uuid[8] & 0x3f);
 597 }
 598
 599
 600 u16 wps_config_methods_str2bin(const char *str)
 601 {
 602         u16 methods = 0;
 603
 604         if (str == NULL) {
 605                 /* Default to enabling methods based on build configuration */
 606                 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
 607 #ifdef CONFIG_WPS_UFD
 608                 methods |= WPS_CONFIG_USBA;
 609 #endif /* CONFIG_WPS_UFD */
 610 #ifdef CONFIG_WPS_NFC
 611                 methods |= WPS_CONFIG_NFC_INTERFACE;
 612 #endif /* CONFIG_WPS_NFC */
 613         } else {
 614                 if (os_strstr(str, "usba"))
 615                         methods |= WPS_CONFIG_USBA;
 616                 if (os_strstr(str, "ethernet"))
 617                         methods |= WPS_CONFIG_ETHERNET;
 618                 if (os_strstr(str, "label"))
 619                         methods |= WPS_CONFIG_LABEL;
 620                 if (os_strstr(str, "display"))
 621                         methods |= WPS_CONFIG_DISPLAY;
 622                 if (os_strstr(str, "ext_nfc_token"))
 623                         methods |= WPS_CONFIG_EXT_NFC_TOKEN;
 624                 if (os_strstr(str, "int_nfc_token"))
 625                         methods |= WPS_CONFIG_INT_NFC_TOKEN;
 626                 if (os_strstr(str, "nfc_interface"))
 627                         methods |= WPS_CONFIG_NFC_INTERFACE;
 628                 if (os_strstr(str, "push_button"))
 629                         methods |= WPS_CONFIG_PUSHBUTTON;
 630                 if (os_strstr(str, "keypad"))
 631                         methods |= WPS_CONFIG_KEYPAD;
 632         }
 633
 634         return methods;
 635 }