contrib/hostapd/src/wps/wps_attr_parse.c

   1 /*
   2  * Wi-Fi Protected Setup - attribute parsing
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "wps_defs.h"
  13 #include "wps_attr_parse.h"
  14
  15 #ifndef CONFIG_WPS_STRICT
  16 #define WPS_WORKAROUNDS
  17 #endif /* CONFIG_WPS_STRICT */
  18
  19
  20 static int wps_set_vendor_ext_wfa_subelem(struct wps_parse_attr *attr,
  21                                           u8 id, u8 len, const u8 *pos)
  22 {
  23         wpa_printf(MSG_EXCESSIVE, "WPS: WFA subelement id=%u len=%u",
  24                    id, len);
  25         switch (id) {
  26         case WFA_ELEM_VERSION2:
  27                 if (len != 1) {
  28                         wpa_printf(MSG_DEBUG, "WPS: Invalid Version2 length "
  29                                    "%u", len);
  30                         return -1;
  31                 }
  32                 attr->version2 = pos;
  33                 break;
  34         case WFA_ELEM_AUTHORIZEDMACS:
  35                 attr->authorized_macs = pos;
  36                 attr->authorized_macs_len = len;
  37                 break;
  38         case WFA_ELEM_NETWORK_KEY_SHAREABLE:
  39                 if (len != 1) {
  40                         wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key "
  41                                    "Shareable length %u", len);
  42                         return -1;
  43                 }
  44                 attr->network_key_shareable = pos;
  45                 break;
  46         case WFA_ELEM_REQUEST_TO_ENROLL:
  47                 if (len != 1) {
  48                         wpa_printf(MSG_DEBUG, "WPS: Invalid Request to Enroll "
  49                                    "length %u", len);
  50                         return -1;
  51                 }
  52                 attr->request_to_enroll = pos;
  53                 break;
  54         case WFA_ELEM_SETTINGS_DELAY_TIME:
  55                 if (len != 1) {
  56                         wpa_printf(MSG_DEBUG, "WPS: Invalid Settings Delay "
  57                                    "Time length %u", len);
  58                         return -1;
  59                 }
  60                 attr->settings_delay_time = pos;
  61                 break;
  62         default:
  63                 wpa_printf(MSG_MSGDUMP, "WPS: Skipped unknown WFA Vendor "
  64                            "Extension subelement %u", id);
  65                 break;
  66         }
  67
  68         return 0;
  69 }
  70
  71
  72 static int wps_parse_vendor_ext_wfa(struct wps_parse_attr *attr, const u8 *pos,
  73                                     u16 len)
  74 {
  75         const u8 *end = pos + len;
  76         u8 id, elen;
  77
  78         while (pos + 2 < end) {
  79                 id = *pos++;
  80                 elen = *pos++;
  81                 if (pos + elen > end)
  82                         break;
  83                 if (wps_set_vendor_ext_wfa_subelem(attr, id, elen, pos) < 0)
  84                         return -1;
  85                 pos += elen;
  86         }
  87
  88         return 0;
  89 }
  90
  91
  92 static int wps_parse_vendor_ext(struct wps_parse_attr *attr, const u8 *pos,
  93                                 u16 len)
  94 {
  95         u32 vendor_id;
  96
  97         if (len < 3) {
  98                 wpa_printf(MSG_DEBUG, "WPS: Skip invalid Vendor Extension");
  99                 return 0;
 100         }
 101
 102         vendor_id = WPA_GET_BE24(pos);
 103         switch (vendor_id) {
 104         case WPS_VENDOR_ID_WFA:
 105                 return wps_parse_vendor_ext_wfa(attr, pos + 3, len - 3);
 106         }
 107
 108         /* Handle unknown vendor extensions */
 109
 110         wpa_printf(MSG_MSGDUMP, "WPS: Unknown Vendor Extension (Vendor ID %u)",
 111                    vendor_id);
 112
 113         if (len > WPS_MAX_VENDOR_EXT_LEN) {
 114                 wpa_printf(MSG_DEBUG, "WPS: Too long Vendor Extension (%u)",
 115                            len);
 116                 return -1;
 117         }
 118
 119         if (attr->num_vendor_ext >= MAX_WPS_PARSE_VENDOR_EXT) {
 120                 wpa_printf(MSG_DEBUG, "WPS: Skipped Vendor Extension "
 121                            "attribute (max %d vendor extensions)",
 122                            MAX_WPS_PARSE_VENDOR_EXT);
 123                 return -1;
 124         }
 125         attr->vendor_ext[attr->num_vendor_ext] = pos;
 126         attr->vendor_ext_len[attr->num_vendor_ext] = len;
 127         attr->num_vendor_ext++;
 128
 129         return 0;
 130 }
 131
 132
 133 static int wps_set_attr(struct wps_parse_attr *attr, u16 type,
 134                         const u8 *pos, u16 len)
 135 {
 136         switch (type) {
 137         case ATTR_VERSION:
 138                 if (len != 1) {
 139                         wpa_printf(MSG_DEBUG, "WPS: Invalid Version length %u",
 140                                    len);
 141                         return -1;
 142                 }
 143                 attr->version = pos;
 144                 break;
 145         case ATTR_MSG_TYPE:
 146                 if (len != 1) {
 147                         wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type "
 148                                    "length %u", len);
 149                         return -1;
 150                 }
 151                 attr->msg_type = pos;
 152                 break;
 153         case ATTR_ENROLLEE_NONCE:
 154                 if (len != WPS_NONCE_LEN) {
 155                         wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce "
 156                                    "length %u", len);
 157                         return -1;
 158                 }
 159                 attr->enrollee_nonce = pos;
 160                 break;
 161         case ATTR_REGISTRAR_NONCE:
 162                 if (len != WPS_NONCE_LEN) {
 163                         wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce "
 164                                    "length %u", len);
 165                         return -1;
 166                 }
 167                 attr->registrar_nonce = pos;
 168                 break;
 169         case ATTR_UUID_E:
 170                 if (len != WPS_UUID_LEN) {
 171                         wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-E length %u",
 172                                    len);
 173                         return -1;
 174                 }
 175                 attr->uuid_e = pos;
 176                 break;
 177         case ATTR_UUID_R:
 178                 if (len != WPS_UUID_LEN) {
 179                         wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-R length %u",
 180                                    len);
 181                         return -1;
 182                 }
 183                 attr->uuid_r = pos;
 184                 break;
 185         case ATTR_AUTH_TYPE_FLAGS:
 186                 if (len != 2) {
 187                         wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
 188                                    "Type Flags length %u", len);
 189                         return -1;
 190                 }
 191                 attr->auth_type_flags = pos;
 192                 break;
 193         case ATTR_ENCR_TYPE_FLAGS:
 194                 if (len != 2) {
 195                         wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption Type "
 196                                    "Flags length %u", len);
 197                         return -1;
 198                 }
 199                 attr->encr_type_flags = pos;
 200                 break;
 201         case ATTR_CONN_TYPE_FLAGS:
 202                 if (len != 1) {
 203                         wpa_printf(MSG_DEBUG, "WPS: Invalid Connection Type "
 204                                    "Flags length %u", len);
 205                         return -1;
 206                 }
 207                 attr->conn_type_flags = pos;
 208                 break;
 209         case ATTR_CONFIG_METHODS:
 210                 if (len != 2) {
 211                         wpa_printf(MSG_DEBUG, "WPS: Invalid Config Methods "
 212                                    "length %u", len);
 213                         return -1;
 214                 }
 215                 attr->config_methods = pos;
 216                 break;
 217         case ATTR_SELECTED_REGISTRAR_CONFIG_METHODS:
 218                 if (len != 2) {
 219                         wpa_printf(MSG_DEBUG, "WPS: Invalid Selected "
 220                                    "Registrar Config Methods length %u", len);
 221                         return -1;
 222                 }
 223                 attr->sel_reg_config_methods = pos;
 224                 break;
 225         case ATTR_PRIMARY_DEV_TYPE:
 226                 if (len != WPS_DEV_TYPE_LEN) {
 227                         wpa_printf(MSG_DEBUG, "WPS: Invalid Primary Device "
 228                                    "Type length %u", len);
 229                         return -1;
 230                 }
 231                 attr->primary_dev_type = pos;
 232                 break;
 233         case ATTR_RF_BANDS:
 234                 if (len != 1) {
 235                         wpa_printf(MSG_DEBUG, "WPS: Invalid RF Bands length "
 236                                    "%u", len);
 237                         return -1;
 238                 }
 239                 attr->rf_bands = pos;
 240                 break;
 241         case ATTR_ASSOC_STATE:
 242                 if (len != 2) {
 243                         wpa_printf(MSG_DEBUG, "WPS: Invalid Association State "
 244                                    "length %u", len);
 245                         return -1;
 246                 }
 247                 attr->assoc_state = pos;
 248                 break;
 249         case ATTR_CONFIG_ERROR:
 250                 if (len != 2) {
 251                         wpa_printf(MSG_DEBUG, "WPS: Invalid Configuration "
 252                                    "Error length %u", len);
 253                         return -1;
 254                 }
 255                 attr->config_error = pos;
 256                 break;
 257         case ATTR_DEV_PASSWORD_ID:
 258                 if (len != 2) {
 259                         wpa_printf(MSG_DEBUG, "WPS: Invalid Device Password "
 260                                    "ID length %u", len);
 261                         return -1;
 262                 }
 263                 attr->dev_password_id = pos;
 264                 break;
 265         case ATTR_OOB_DEVICE_PASSWORD:
 266                 if (len < WPS_OOB_PUBKEY_HASH_LEN + 2 ||
 267                     len > WPS_OOB_PUBKEY_HASH_LEN + 2 +
 268                     WPS_OOB_DEVICE_PASSWORD_LEN ||
 269                     (len < WPS_OOB_PUBKEY_HASH_LEN + 2 +
 270                      WPS_OOB_DEVICE_PASSWORD_MIN_LEN &&
 271                      WPA_GET_BE16(pos + WPS_OOB_PUBKEY_HASH_LEN) !=
 272                      DEV_PW_NFC_CONNECTION_HANDOVER)) {
 273                         wpa_printf(MSG_DEBUG, "WPS: Invalid OOB Device "
 274                                    "Password length %u", len);
 275                         return -1;
 276                 }
 277                 attr->oob_dev_password = pos;
 278                 attr->oob_dev_password_len = len;
 279                 break;
 280         case ATTR_OS_VERSION:
 281                 if (len != 4) {
 282                         wpa_printf(MSG_DEBUG, "WPS: Invalid OS Version length "
 283                                    "%u", len);
 284                         return -1;
 285                 }
 286                 attr->os_version = pos;
 287                 break;
 288         case ATTR_WPS_STATE:
 289                 if (len != 1) {
 290                         wpa_printf(MSG_DEBUG, "WPS: Invalid Wi-Fi Protected "
 291                                    "Setup State length %u", len);
 292                         return -1;
 293                 }
 294                 attr->wps_state = pos;
 295                 break;
 296         case ATTR_AUTHENTICATOR:
 297                 if (len != WPS_AUTHENTICATOR_LEN) {
 298                         wpa_printf(MSG_DEBUG, "WPS: Invalid Authenticator "
 299                                    "length %u", len);
 300                         return -1;
 301                 }
 302                 attr->authenticator = pos;
 303                 break;
 304         case ATTR_R_HASH1:
 305                 if (len != WPS_HASH_LEN) {
 306                         wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash1 length %u",
 307                                    len);
 308                         return -1;
 309                 }
 310                 attr->r_hash1 = pos;
 311                 break;
 312         case ATTR_R_HASH2:
 313                 if (len != WPS_HASH_LEN) {
 314                         wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash2 length %u",
 315                                    len);
 316                         return -1;
 317                 }
 318                 attr->r_hash2 = pos;
 319                 break;
 320         case ATTR_E_HASH1:
 321                 if (len != WPS_HASH_LEN) {
 322                         wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash1 length %u",
 323                                    len);
 324                         return -1;
 325                 }
 326                 attr->e_hash1 = pos;
 327                 break;
 328         case ATTR_E_HASH2:
 329                 if (len != WPS_HASH_LEN) {
 330                         wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash2 length %u",
 331                                    len);
 332                         return -1;
 333                 }
 334                 attr->e_hash2 = pos;
 335                 break;
 336         case ATTR_R_SNONCE1:
 337                 if (len != WPS_SECRET_NONCE_LEN) {
 338                         wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce1 length "
 339                                    "%u", len);
 340                         return -1;
 341                 }
 342                 attr->r_snonce1 = pos;
 343                 break;
 344         case ATTR_R_SNONCE2:
 345                 if (len != WPS_SECRET_NONCE_LEN) {
 346                         wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce2 length "
 347                                    "%u", len);
 348                         return -1;
 349                 }
 350                 attr->r_snonce2 = pos;
 351                 break;
 352         case ATTR_E_SNONCE1:
 353                 if (len != WPS_SECRET_NONCE_LEN) {
 354                         wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce1 length "
 355                                    "%u", len);
 356                         return -1;
 357                 }
 358                 attr->e_snonce1 = pos;
 359                 break;
 360         case ATTR_E_SNONCE2:
 361                 if (len != WPS_SECRET_NONCE_LEN) {
 362                         wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce2 length "
 363                                    "%u", len);
 364                         return -1;
 365                 }
 366                 attr->e_snonce2 = pos;
 367                 break;
 368         case ATTR_KEY_WRAP_AUTH:
 369                 if (len != WPS_KWA_LEN) {
 370                         wpa_printf(MSG_DEBUG, "WPS: Invalid Key Wrap "
 371                                    "Authenticator length %u", len);
 372                         return -1;
 373                 }
 374                 attr->key_wrap_auth = pos;
 375                 break;
 376         case ATTR_AUTH_TYPE:
 377                 if (len != 2) {
 378                         wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
 379                                    "Type length %u", len);
 380                         return -1;
 381                 }
 382                 attr->auth_type = pos;
 383                 break;
 384         case ATTR_ENCR_TYPE:
 385                 if (len != 2) {
 386                         wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption "
 387                                    "Type length %u", len);
 388                         return -1;
 389                 }
 390                 attr->encr_type = pos;
 391                 break;
 392         case ATTR_NETWORK_INDEX:
 393                 if (len != 1) {
 394                         wpa_printf(MSG_DEBUG, "WPS: Invalid Network Index "
 395                                    "length %u", len);
 396                         return -1;
 397                 }
 398                 attr->network_idx = pos;
 399                 break;
 400         case ATTR_NETWORK_KEY_INDEX:
 401                 if (len != 1) {
 402                         wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key Index "
 403                                    "length %u", len);
 404                         return -1;
 405                 }
 406                 attr->network_key_idx = pos;
 407                 break;
 408         case ATTR_MAC_ADDR:
 409                 if (len != ETH_ALEN) {
 410                         wpa_printf(MSG_DEBUG, "WPS: Invalid MAC Address "
 411                                    "length %u", len);
 412                         return -1;
 413                 }
 414                 attr->mac_addr = pos;
 415                 break;
 416         case ATTR_KEY_PROVIDED_AUTO:
 417                 if (len != 1) {
 418                         wpa_printf(MSG_DEBUG, "WPS: Invalid Key Provided "
 419                                    "Automatically length %u", len);
 420                         return -1;
 421                 }
 422                 attr->key_prov_auto = pos;
 423                 break;
 424         case ATTR_802_1X_ENABLED:
 425                 if (len != 1) {
 426                         wpa_printf(MSG_DEBUG, "WPS: Invalid 802.1X Enabled "
 427                                    "length %u", len);
 428                         return -1;
 429                 }
 430                 attr->dot1x_enabled = pos;
 431                 break;
 432         case ATTR_SELECTED_REGISTRAR:
 433                 if (len != 1) {
 434                         wpa_printf(MSG_DEBUG, "WPS: Invalid Selected Registrar"
 435                                    " length %u", len);
 436                         return -1;
 437                 }
 438                 attr->selected_registrar = pos;
 439                 break;
 440         case ATTR_REQUEST_TYPE:
 441                 if (len != 1) {
 442                         wpa_printf(MSG_DEBUG, "WPS: Invalid Request Type "
 443                                    "length %u", len);
 444                         return -1;
 445                 }
 446                 attr->request_type = pos;
 447                 break;
 448         case ATTR_RESPONSE_TYPE:
 449                 if (len != 1) {
 450                         wpa_printf(MSG_DEBUG, "WPS: Invalid Response Type "
 451                                    "length %u", len);
 452                         return -1;
 453                 }
 454                 attr->response_type = pos;
 455                 break;
 456         case ATTR_MANUFACTURER:
 457                 attr->manufacturer = pos;
 458                 attr->manufacturer_len = len;
 459                 break;
 460         case ATTR_MODEL_NAME:
 461                 attr->model_name = pos;
 462                 attr->model_name_len = len;
 463                 break;
 464         case ATTR_MODEL_NUMBER:
 465                 attr->model_number = pos;
 466                 attr->model_number_len = len;
 467                 break;
 468         case ATTR_SERIAL_NUMBER:
 469                 attr->serial_number = pos;
 470                 attr->serial_number_len = len;
 471                 break;
 472         case ATTR_DEV_NAME:
 473                 attr->dev_name = pos;
 474                 attr->dev_name_len = len;
 475                 break;
 476         case ATTR_PUBLIC_KEY:
 477                 attr->public_key = pos;
 478                 attr->public_key_len = len;
 479                 break;
 480         case ATTR_ENCR_SETTINGS:
 481                 attr->encr_settings = pos;
 482                 attr->encr_settings_len = len;
 483                 break;
 484         case ATTR_CRED:
 485                 if (attr->num_cred >= MAX_CRED_COUNT) {
 486                         wpa_printf(MSG_DEBUG, "WPS: Skipped Credential "
 487                                    "attribute (max %d credentials)",
 488                                    MAX_CRED_COUNT);
 489                         break;
 490                 }
 491                 attr->cred[attr->num_cred] = pos;
 492                 attr->cred_len[attr->num_cred] = len;
 493                 attr->num_cred++;
 494                 break;
 495         case ATTR_SSID:
 496                 attr->ssid = pos;
 497                 attr->ssid_len = len;
 498                 break;
 499         case ATTR_NETWORK_KEY:
 500                 attr->network_key = pos;
 501                 attr->network_key_len = len;
 502                 break;
 503         case ATTR_EAP_TYPE:
 504                 attr->eap_type = pos;
 505                 attr->eap_type_len = len;
 506                 break;
 507         case ATTR_EAP_IDENTITY:
 508                 attr->eap_identity = pos;
 509                 attr->eap_identity_len = len;
 510                 break;
 511         case ATTR_AP_SETUP_LOCKED:
 512                 if (len != 1) {
 513                         wpa_printf(MSG_DEBUG, "WPS: Invalid AP Setup Locked "
 514                                    "length %u", len);
 515                         return -1;
 516                 }
 517                 attr->ap_setup_locked = pos;
 518                 break;
 519         case ATTR_REQUESTED_DEV_TYPE:
 520                 if (len != WPS_DEV_TYPE_LEN) {
 521                         wpa_printf(MSG_DEBUG, "WPS: Invalid Requested Device "
 522                                    "Type length %u", len);
 523                         return -1;
 524                 }
 525                 if (attr->num_req_dev_type >= MAX_REQ_DEV_TYPE_COUNT) {
 526                         wpa_printf(MSG_DEBUG, "WPS: Skipped Requested Device "
 527                                    "Type attribute (max %u types)",
 528                                    MAX_REQ_DEV_TYPE_COUNT);
 529                         break;
 530                 }
 531                 attr->req_dev_type[attr->num_req_dev_type] = pos;
 532                 attr->num_req_dev_type++;
 533                 break;
 534         case ATTR_SECONDARY_DEV_TYPE_LIST:
 535                 if (len > WPS_SEC_DEV_TYPE_MAX_LEN ||
 536                     (len % WPS_DEV_TYPE_LEN) > 0) {
 537                         wpa_printf(MSG_DEBUG, "WPS: Invalid Secondary Device "
 538                                    "Type length %u", len);
 539                         return -1;
 540                 }
 541                 attr->sec_dev_type_list = pos;
 542                 attr->sec_dev_type_list_len = len;
 543                 break;
 544         case ATTR_VENDOR_EXT:
 545                 if (wps_parse_vendor_ext(attr, pos, len) < 0)
 546                         return -1;
 547                 break;
 548         case ATTR_AP_CHANNEL:
 549                 if (len != 2) {
 550                         wpa_printf(MSG_DEBUG, "WPS: Invalid AP Channel "
 551                                    "length %u", len);
 552                         return -1;
 553                 }
 554                 attr->ap_channel = pos;
 555                 break;
 556         default:
 557                 wpa_printf(MSG_DEBUG, "WPS: Unsupported attribute type 0x%x "
 558                            "len=%u", type, len);
 559                 break;
 560         }
 561
 562         return 0;
 563 }
 564
 565
 566 int wps_parse_msg(const struct wpabuf *msg, struct wps_parse_attr *attr)
 567 {
 568         const u8 *pos, *end;
 569         u16 type, len;
 570 #ifdef WPS_WORKAROUNDS
 571         u16 prev_type = 0;
 572 #endif /* WPS_WORKAROUNDS */
 573
 574         os_memset(attr, 0, sizeof(*attr));
 575         pos = wpabuf_head(msg);
 576         end = pos + wpabuf_len(msg);
 577
 578         while (pos < end) {
 579                 if (end - pos < 4) {
 580                         wpa_printf(MSG_DEBUG, "WPS: Invalid message - "
 581                                    "%lu bytes remaining",
 582                                    (unsigned long) (end - pos));
 583                         return -1;
 584                 }
 585
 586                 type = WPA_GET_BE16(pos);
 587                 pos += 2;
 588                 len = WPA_GET_BE16(pos);
 589                 pos += 2;
 590                 wpa_printf(MSG_EXCESSIVE, "WPS: attr type=0x%x len=%u",
 591                            type, len);
 592                 if (len > end - pos) {
 593                         wpa_printf(MSG_DEBUG, "WPS: Attribute overflow");
 594                         wpa_hexdump_buf(MSG_MSGDUMP, "WPS: Message data", msg);
 595 #ifdef WPS_WORKAROUNDS
 596                         /*
 597                          * Some deployed APs seem to have a bug in encoding of
 598                          * Network Key attribute in the Credential attribute
 599                          * where they add an extra octet after the Network Key
 600                          * attribute at least when open network is being
 601                          * provisioned.
 602                          */
 603                         if ((type & 0xff00) != 0x1000 &&
 604                             prev_type == ATTR_NETWORK_KEY) {
 605                                 wpa_printf(MSG_DEBUG, "WPS: Workaround - try "
 606                                            "to skip unexpected octet after "
 607                                            "Network Key");
 608                                 pos -= 3;
 609                                 continue;
 610                         }
 611 #endif /* WPS_WORKAROUNDS */
 612                         return -1;
 613                 }
 614
 615 #ifdef WPS_WORKAROUNDS
 616                 if (type == 0 && len == 0) {
 617                         /*
 618                          * Mac OS X 10.6 seems to be adding 0x00 padding to the
 619                          * end of M1. Skip those to avoid interop issues.
 620                          */
 621                         int i;
 622                         for (i = 0; i < end - pos; i++) {
 623                                 if (pos[i])
 624                                         break;
 625                         }
 626                         if (i == end - pos) {
 627                                 wpa_printf(MSG_DEBUG, "WPS: Workaround - skip "
 628                                            "unexpected message padding");
 629                                 break;
 630                         }
 631                 }
 632 #endif /* WPS_WORKAROUNDS */
 633
 634                 if (wps_set_attr(attr, type, pos, len) < 0)
 635                         return -1;
 636
 637 #ifdef WPS_WORKAROUNDS
 638                 prev_type = type;
 639 #endif /* WPS_WORKAROUNDS */
 640                 pos += len;
 641         }
 642
 643         return 0;
 644 }