src/wps/wps.c

   1 /*
   2  * Wi-Fi Protected Setup
   3  * Copyright (c) 2007-2009, 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 "crypto/dh_group5.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "wps_i.h"
  15 #include "wps_dev_attr.h"
  16
  17
  18 #ifdef CONFIG_WPS_TESTING
  19 int wps_version_number = 0x20;
  20 int wps_testing_dummy_cred = 0;
  21 #endif /* CONFIG_WPS_TESTING */
  22
  23
  24 /**
  25  * wps_init - Initialize WPS Registration protocol data
  26  * @cfg: WPS configuration
  27  * Returns: Pointer to allocated data or %NULL on failure
  28  *
  29  * This function is used to initialize WPS data for a registration protocol
  30  * instance (i.e., each run of registration protocol as a Registrar of
  31  * Enrollee. The caller is responsible for freeing this data after the
  32  * registration run has been completed by calling wps_deinit().
  33  */
  34 struct wps_data * wps_init(const struct wps_config *cfg)
  35 {
  36         struct wps_data *data = os_zalloc(sizeof(*data));
  37         if (data == NULL)
  38                 return NULL;
  39         data->wps = cfg->wps;
  40         data->registrar = cfg->registrar;
  41         if (cfg->registrar) {
  42                 os_memcpy(data->uuid_r, cfg->wps->uuid, WPS_UUID_LEN);
  43         } else {
  44                 os_memcpy(data->mac_addr_e, cfg->wps->dev.mac_addr, ETH_ALEN);
  45                 os_memcpy(data->uuid_e, cfg->wps->uuid, WPS_UUID_LEN);
  46         }
  47         if (cfg->pin) {
  48                 data->dev_pw_id = cfg->dev_pw_id;
  49                 data->dev_password = os_malloc(cfg->pin_len);
  50                 if (data->dev_password == NULL) {
  51                         os_free(data);
  52                         return NULL;
  53                 }
  54                 os_memcpy(data->dev_password, cfg->pin, cfg->pin_len);
  55                 data->dev_password_len = cfg->pin_len;
  56                 wpa_hexdump_key(MSG_DEBUG, "WPS: AP PIN dev_password",
  57                                 data->dev_password, data->dev_password_len);
  58         }
  59
  60 #ifdef CONFIG_WPS_NFC
  61         if (cfg->wps->ap && !cfg->registrar && cfg->wps->ap_nfc_dev_pw_id) {
  62                 /* Keep AP PIN as alternative Device Password */
  63                 data->alt_dev_pw_id = data->dev_pw_id;
  64                 data->alt_dev_password = data->dev_password;
  65                 data->alt_dev_password_len = data->dev_password_len;
  66
  67                 data->dev_pw_id = cfg->wps->ap_nfc_dev_pw_id;
  68                 data->dev_password =
  69                         os_malloc(wpabuf_len(cfg->wps->ap_nfc_dev_pw));
  70                 if (data->dev_password == NULL) {
  71                         os_free(data);
  72                         return NULL;
  73                 }
  74                 os_memcpy(data->dev_password,
  75                           wpabuf_head(cfg->wps->ap_nfc_dev_pw),
  76                           wpabuf_len(cfg->wps->ap_nfc_dev_pw));
  77                 data->dev_password_len = wpabuf_len(cfg->wps->ap_nfc_dev_pw);
  78                 wpa_hexdump_key(MSG_DEBUG, "WPS: NFC dev_password",
  79                             data->dev_password, data->dev_password_len);
  80         }
  81 #endif /* CONFIG_WPS_NFC */
  82
  83         data->pbc = cfg->pbc;
  84         if (cfg->pbc) {
  85                 /* Use special PIN '00000000' for PBC */
  86                 data->dev_pw_id = DEV_PW_PUSHBUTTON;
  87                 os_free(data->dev_password);
  88                 data->dev_password = (u8 *) os_strdup("00000000");
  89                 if (data->dev_password == NULL) {
  90                         os_free(data);
  91                         return NULL;
  92                 }
  93                 data->dev_password_len = 8;
  94         }
  95
  96         data->state = data->registrar ? RECV_M1 : SEND_M1;
  97
  98         if (cfg->assoc_wps_ie) {
  99                 struct wps_parse_attr attr;
 100                 wpa_hexdump_buf(MSG_DEBUG, "WPS: WPS IE from (Re)AssocReq",
 101                                 cfg->assoc_wps_ie);
 102                 if (wps_parse_msg(cfg->assoc_wps_ie, &attr) < 0) {
 103                         wpa_printf(MSG_DEBUG, "WPS: Failed to parse WPS IE "
 104                                    "from (Re)AssocReq");
 105                 } else if (attr.request_type == NULL) {
 106                         wpa_printf(MSG_DEBUG, "WPS: No Request Type attribute "
 107                                    "in (Re)AssocReq WPS IE");
 108                 } else {
 109                         wpa_printf(MSG_DEBUG, "WPS: Request Type (from WPS IE "
 110                                    "in (Re)AssocReq WPS IE): %d",
 111                                    *attr.request_type);
 112                         data->request_type = *attr.request_type;
 113                 }
 114         }
 115
 116         if (cfg->new_ap_settings) {
 117                 data->new_ap_settings =
 118                         os_malloc(sizeof(*data->new_ap_settings));
 119                 if (data->new_ap_settings == NULL) {
 120                         os_free(data->dev_password);
 121                         os_free(data);
 122                         return NULL;
 123                 }
 124                 os_memcpy(data->new_ap_settings, cfg->new_ap_settings,
 125                           sizeof(*data->new_ap_settings));
 126         }
 127
 128         if (cfg->peer_addr)
 129                 os_memcpy(data->peer_dev.mac_addr, cfg->peer_addr, ETH_ALEN);
 130         if (cfg->p2p_dev_addr)
 131                 os_memcpy(data->p2p_dev_addr, cfg->p2p_dev_addr, ETH_ALEN);
 132
 133         data->use_psk_key = cfg->use_psk_key;
 134         data->pbc_in_m1 = cfg->pbc_in_m1;
 135
 136         return data;
 137 }
 138
 139
 140 /**
 141  * wps_deinit - Deinitialize WPS Registration protocol data
 142  * @data: WPS Registration protocol data from wps_init()
 143  */
 144 void wps_deinit(struct wps_data *data)
 145 {
 146 #ifdef CONFIG_WPS_NFC
 147         if (data->registrar && data->nfc_pw_token)
 148                 wps_registrar_remove_nfc_pw_token(data->wps->registrar,
 149                                                   data->nfc_pw_token);
 150 #endif /* CONFIG_WPS_NFC */
 151
 152         if (data->wps_pin_revealed) {
 153                 wpa_printf(MSG_DEBUG, "WPS: Full PIN information revealed and "
 154                            "negotiation failed");
 155                 if (data->registrar)
 156                         wps_registrar_invalidate_pin(data->wps->registrar,
 157                                                      data->uuid_e);
 158         } else if (data->registrar)
 159                 wps_registrar_unlock_pin(data->wps->registrar, data->uuid_e);
 160
 161         wpabuf_free(data->dh_privkey);
 162         wpabuf_free(data->dh_pubkey_e);
 163         wpabuf_free(data->dh_pubkey_r);
 164         wpabuf_free(data->last_msg);
 165         os_free(data->dev_password);
 166         os_free(data->alt_dev_password);
 167         os_free(data->new_psk);
 168         wps_device_data_free(&data->peer_dev);
 169         os_free(data->new_ap_settings);
 170         dh5_free(data->dh_ctx);
 171         os_free(data->nfc_pw_token);
 172         os_free(data);
 173 }
 174
 175
 176 /**
 177  * wps_process_msg - Process a WPS message
 178  * @wps: WPS Registration protocol data from wps_init()
 179  * @op_code: Message OP Code
 180  * @msg: Message data
 181  * Returns: Processing result
 182  *
 183  * This function is used to process WPS messages with OP Codes WSC_ACK,
 184  * WSC_NACK, WSC_MSG, and WSC_Done. The caller (e.g., EAP server/peer) is
 185  * responsible for reassembling the messages before calling this function.
 186  * Response to this message is built by calling wps_get_msg().
 187  */
 188 enum wps_process_res wps_process_msg(struct wps_data *wps,
 189                                      enum wsc_op_code op_code,
 190                                      const struct wpabuf *msg)
 191 {
 192         if (wps->registrar)
 193                 return wps_registrar_process_msg(wps, op_code, msg);
 194         else
 195                 return wps_enrollee_process_msg(wps, op_code, msg);
 196 }
 197
 198
 199 /**
 200  * wps_get_msg - Build a WPS message
 201  * @wps: WPS Registration protocol data from wps_init()
 202  * @op_code: Buffer for returning message OP Code
 203  * Returns: The generated WPS message or %NULL on failure
 204  *
 205  * This function is used to build a response to a message processed by calling
 206  * wps_process_msg(). The caller is responsible for freeing the buffer.
 207  */
 208 struct wpabuf * wps_get_msg(struct wps_data *wps, enum wsc_op_code *op_code)
 209 {
 210         if (wps->registrar)
 211                 return wps_registrar_get_msg(wps, op_code);
 212         else
 213                 return wps_enrollee_get_msg(wps, op_code);
 214 }
 215
 216
 217 /**
 218  * wps_is_selected_pbc_registrar - Check whether WPS IE indicates active PBC
 219  * @msg: WPS IE contents from Beacon or Probe Response frame
 220  * Returns: 1 if PBC Registrar is active, 0 if not
 221  */
 222 int wps_is_selected_pbc_registrar(const struct wpabuf *msg)
 223 {
 224         struct wps_parse_attr attr;
 225
 226         /*
 227          * In theory, this could also verify that attr.sel_reg_config_methods
 228          * includes WPS_CONFIG_PUSHBUTTON, but some deployed AP implementations
 229          * do not set Selected Registrar Config Methods attribute properly, so
 230          * it is safer to just use Device Password ID here.
 231          */
 232
 233         if (wps_parse_msg(msg, &attr) < 0 ||
 234             !attr.selected_registrar || *attr.selected_registrar == 0 ||
 235             !attr.dev_password_id ||
 236             WPA_GET_BE16(attr.dev_password_id) != DEV_PW_PUSHBUTTON)
 237                 return 0;
 238
 239 #ifdef CONFIG_WPS_STRICT
 240         if (!attr.sel_reg_config_methods ||
 241             !(WPA_GET_BE16(attr.sel_reg_config_methods) &
 242               WPS_CONFIG_PUSHBUTTON))
 243                 return 0;
 244 #endif /* CONFIG_WPS_STRICT */
 245
 246         return 1;
 247 }
 248
 249
 250 static int is_selected_pin_registrar(struct wps_parse_attr *attr)
 251 {
 252         /*
 253          * In theory, this could also verify that attr.sel_reg_config_methods
 254          * includes WPS_CONFIG_LABEL, WPS_CONFIG_DISPLAY, or WPS_CONFIG_KEYPAD,
 255          * but some deployed AP implementations do not set Selected Registrar
 256          * Config Methods attribute properly, so it is safer to just use
 257          * Device Password ID here.
 258          */
 259
 260         if (!attr->selected_registrar || *attr->selected_registrar == 0)
 261                 return 0;
 262
 263         if (attr->dev_password_id != NULL &&
 264             WPA_GET_BE16(attr->dev_password_id) == DEV_PW_PUSHBUTTON)
 265                 return 0;
 266
 267 #ifdef CONFIG_WPS_STRICT
 268         if (!attr->sel_reg_config_methods ||
 269             !(WPA_GET_BE16(attr->sel_reg_config_methods) &
 270               (WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD)))
 271                 return 0;
 272 #endif /* CONFIG_WPS_STRICT */
 273
 274         return 1;
 275 }
 276
 277
 278 /**
 279  * wps_is_selected_pin_registrar - Check whether WPS IE indicates active PIN
 280  * @msg: WPS IE contents from Beacon or Probe Response frame
 281  * Returns: 1 if PIN Registrar is active, 0 if not
 282  */
 283 int wps_is_selected_pin_registrar(const struct wpabuf *msg)
 284 {
 285         struct wps_parse_attr attr;
 286
 287         if (wps_parse_msg(msg, &attr) < 0)
 288                 return 0;
 289
 290         return is_selected_pin_registrar(&attr);
 291 }
 292
 293
 294 /**
 295  * wps_is_addr_authorized - Check whether WPS IE authorizes MAC address
 296  * @msg: WPS IE contents from Beacon or Probe Response frame
 297  * @addr: MAC address to search for
 298  * @ver1_compat: Whether to use version 1 compatibility mode
 299  * Returns: 2 if the specified address is explicit authorized, 1 if address is
 300  * authorized (broadcast), 0 if not
 301  */
 302 int wps_is_addr_authorized(const struct wpabuf *msg, const u8 *addr,
 303                            int ver1_compat)
 304 {
 305         struct wps_parse_attr attr;
 306         unsigned int i;
 307         const u8 *pos;
 308         const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 309
 310         if (wps_parse_msg(msg, &attr) < 0)
 311                 return 0;
 312
 313         if (!attr.version2 && ver1_compat) {
 314                 /*
 315                  * Version 1.0 AP - AuthorizedMACs not used, so revert back to
 316                  * old mechanism of using SelectedRegistrar.
 317                  */
 318                 return is_selected_pin_registrar(&attr);
 319         }
 320
 321         if (!attr.authorized_macs)
 322                 return 0;
 323
 324         pos = attr.authorized_macs;
 325         for (i = 0; i < attr.authorized_macs_len / ETH_ALEN; i++) {
 326                 if (os_memcmp(pos, addr, ETH_ALEN) == 0)
 327                         return 2;
 328                 if (os_memcmp(pos, bcast, ETH_ALEN) == 0)
 329                         return 1;
 330                 pos += ETH_ALEN;
 331         }
 332
 333         return 0;
 334 }
 335
 336
 337 /**
 338  * wps_ap_priority_compar - Prioritize WPS IE from two APs
 339  * @wps_a: WPS IE contents from Beacon or Probe Response frame
 340  * @wps_b: WPS IE contents from Beacon or Probe Response frame
 341  * Returns: 1 if wps_b is considered more likely selection for WPS
 342  * provisioning, -1 if wps_a is considered more like, or 0 if no preference
 343  */
 344 int wps_ap_priority_compar(const struct wpabuf *wps_a,
 345                            const struct wpabuf *wps_b)
 346 {
 347         struct wps_parse_attr attr_a, attr_b;
 348         int sel_a, sel_b;
 349
 350         if (wps_a == NULL || wps_parse_msg(wps_a, &attr_a) < 0)
 351                 return 1;
 352         if (wps_b == NULL || wps_parse_msg(wps_b, &attr_b) < 0)
 353                 return -1;
 354
 355         sel_a = attr_a.selected_registrar && *attr_a.selected_registrar != 0;
 356         sel_b = attr_b.selected_registrar && *attr_b.selected_registrar != 0;
 357
 358         if (sel_a && !sel_b)
 359                 return -1;
 360         if (!sel_a && sel_b)
 361                 return 1;
 362
 363         return 0;
 364 }
 365
 366
 367 /**
 368  * wps_get_uuid_e - Get UUID-E from WPS IE
 369  * @msg: WPS IE contents from Beacon or Probe Response frame
 370  * Returns: Pointer to UUID-E or %NULL if not included
 371  *
 372  * The returned pointer is to the msg contents and it remains valid only as
 373  * long as the msg buffer is valid.
 374  */
 375 const u8 * wps_get_uuid_e(const struct wpabuf *msg)
 376 {
 377         struct wps_parse_attr attr;
 378
 379         if (wps_parse_msg(msg, &attr) < 0)
 380                 return NULL;
 381         return attr.uuid_e;
 382 }
 383
 384
 385 /**
 386  * wps_is_20 - Check whether WPS attributes claim support for WPS 2.0
 387  */
 388 int wps_is_20(const struct wpabuf *msg)
 389 {
 390         struct wps_parse_attr attr;
 391
 392         if (msg == NULL || wps_parse_msg(msg, &attr) < 0)
 393                 return 0;
 394         return attr.version2 != NULL;
 395 }
 396
 397
 398 /**
 399  * wps_build_assoc_req_ie - Build WPS IE for (Re)Association Request
 400  * @req_type: Value for Request Type attribute
 401  * Returns: WPS IE or %NULL on failure
 402  *
 403  * The caller is responsible for freeing the buffer.
 404  */
 405 struct wpabuf * wps_build_assoc_req_ie(enum wps_request_type req_type)
 406 {
 407         struct wpabuf *ie;
 408         u8 *len;
 409
 410         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
 411                    "Request");
 412         ie = wpabuf_alloc(100);
 413         if (ie == NULL)
 414                 return NULL;
 415
 416         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 417         len = wpabuf_put(ie, 1);
 418         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 419
 420         if (wps_build_version(ie) ||
 421             wps_build_req_type(ie, req_type) ||
 422             wps_build_wfa_ext(ie, 0, NULL, 0)) {
 423                 wpabuf_free(ie);
 424                 return NULL;
 425         }
 426
 427         *len = wpabuf_len(ie) - 2;
 428
 429         return ie;
 430 }
 431
 432
 433 /**
 434  * wps_build_assoc_resp_ie - Build WPS IE for (Re)Association Response
 435  * Returns: WPS IE or %NULL on failure
 436  *
 437  * The caller is responsible for freeing the buffer.
 438  */
 439 struct wpabuf * wps_build_assoc_resp_ie(void)
 440 {
 441         struct wpabuf *ie;
 442         u8 *len;
 443
 444         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
 445                    "Response");
 446         ie = wpabuf_alloc(100);
 447         if (ie == NULL)
 448                 return NULL;
 449
 450         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 451         len = wpabuf_put(ie, 1);
 452         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 453
 454         if (wps_build_version(ie) ||
 455             wps_build_resp_type(ie, WPS_RESP_AP) ||
 456             wps_build_wfa_ext(ie, 0, NULL, 0)) {
 457                 wpabuf_free(ie);
 458                 return NULL;
 459         }
 460
 461         *len = wpabuf_len(ie) - 2;
 462
 463         return ie;
 464 }
 465
 466
 467 /**
 468  * wps_build_probe_req_ie - Build WPS IE for Probe Request
 469  * @pw_id: Password ID (DEV_PW_PUSHBUTTON for active PBC and DEV_PW_DEFAULT for
 470  * most other use cases)
 471  * @dev: Device attributes
 472  * @uuid: Own UUID
 473  * @req_type: Value for Request Type attribute
 474  * @num_req_dev_types: Number of requested device types
 475  * @req_dev_types: Requested device types (8 * num_req_dev_types octets) or
 476  *      %NULL if none
 477  * Returns: WPS IE or %NULL on failure
 478  *
 479  * The caller is responsible for freeing the buffer.
 480  */
 481 struct wpabuf * wps_build_probe_req_ie(u16 pw_id, struct wps_device_data *dev,
 482                                        const u8 *uuid,
 483                                        enum wps_request_type req_type,
 484                                        unsigned int num_req_dev_types,
 485                                        const u8 *req_dev_types)
 486 {
 487         struct wpabuf *ie;
 488
 489         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for Probe Request");
 490
 491         ie = wpabuf_alloc(500);
 492         if (ie == NULL)
 493                 return NULL;
 494
 495         if (wps_build_version(ie) ||
 496             wps_build_req_type(ie, req_type) ||
 497             wps_build_config_methods(ie, dev->config_methods) ||
 498             wps_build_uuid_e(ie, uuid) ||
 499             wps_build_primary_dev_type(dev, ie) ||
 500             wps_build_rf_bands(dev, ie) ||
 501             wps_build_assoc_state(NULL, ie) ||
 502             wps_build_config_error(ie, WPS_CFG_NO_ERROR) ||
 503             wps_build_dev_password_id(ie, pw_id) ||
 504 #ifdef CONFIG_WPS2
 505             wps_build_manufacturer(dev, ie) ||
 506             wps_build_model_name(dev, ie) ||
 507             wps_build_model_number(dev, ie) ||
 508             wps_build_dev_name(dev, ie) ||
 509             wps_build_wfa_ext(ie, req_type == WPS_REQ_ENROLLEE, NULL, 0) ||
 510 #endif /* CONFIG_WPS2 */
 511             wps_build_req_dev_type(dev, ie, num_req_dev_types, req_dev_types)
 512             ||
 513             wps_build_secondary_dev_type(dev, ie)
 514                 ) {
 515                 wpabuf_free(ie);
 516                 return NULL;
 517         }
 518
 519 #ifndef CONFIG_WPS2
 520         if (dev->p2p && wps_build_dev_name(dev, ie)) {
 521                 wpabuf_free(ie);
 522                 return NULL;
 523         }
 524 #endif /* CONFIG_WPS2 */
 525
 526         return wps_ie_encapsulate(ie);
 527 }
 528
 529
 530 void wps_free_pending_msgs(struct upnp_pending_message *msgs)
 531 {
 532         struct upnp_pending_message *p, *prev;
 533         p = msgs;
 534         while (p) {
 535                 prev = p;
 536                 p = p->next;
 537                 wpabuf_free(prev->msg);
 538                 os_free(prev);
 539         }
 540 }
 541
 542
 543 int wps_attr_text(struct wpabuf *data, char *buf, char *end)
 544 {
 545         struct wps_parse_attr attr;
 546         char *pos = buf;
 547         int ret;
 548
 549         if (wps_parse_msg(data, &attr) < 0)
 550                 return -1;
 551
 552         if (attr.wps_state) {
 553                 if (*attr.wps_state == WPS_STATE_NOT_CONFIGURED)
 554                         ret = os_snprintf(pos, end - pos,
 555                                           "wps_state=unconfigured\n");
 556                 else if (*attr.wps_state == WPS_STATE_CONFIGURED)
 557                         ret = os_snprintf(pos, end - pos,
 558                                           "wps_state=configured\n");
 559                 else
 560                         ret = 0;
 561                 if (ret < 0 || ret >= end - pos)
 562                         return pos - buf;
 563                 pos += ret;
 564         }
 565
 566         if (attr.ap_setup_locked && *attr.ap_setup_locked) {
 567                 ret = os_snprintf(pos, end - pos,
 568                                   "wps_ap_setup_locked=1\n");
 569                 if (ret < 0 || ret >= end - pos)
 570                         return pos - buf;
 571                 pos += ret;
 572         }
 573
 574         if (attr.selected_registrar && *attr.selected_registrar) {
 575                 ret = os_snprintf(pos, end - pos,
 576                                   "wps_selected_registrar=1\n");
 577                 if (ret < 0 || ret >= end - pos)
 578                         return pos - buf;
 579                 pos += ret;
 580         }
 581
 582         if (attr.dev_password_id) {
 583                 ret = os_snprintf(pos, end - pos,
 584                                   "wps_device_password_id=%u\n",
 585                                   WPA_GET_BE16(attr.dev_password_id));
 586                 if (ret < 0 || ret >= end - pos)
 587                         return pos - buf;
 588                 pos += ret;
 589         }
 590
 591         if (attr.sel_reg_config_methods) {
 592                 ret = os_snprintf(pos, end - pos,
 593                                   "wps_selected_registrar_config_methods="
 594                                   "0x%04x\n",
 595                                   WPA_GET_BE16(attr.sel_reg_config_methods));
 596                 if (ret < 0 || ret >= end - pos)
 597                         return pos - buf;
 598                 pos += ret;
 599         }
 600
 601         if (attr.primary_dev_type) {
 602                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 603                 ret = os_snprintf(pos, end - pos,
 604                                   "wps_primary_device_type=%s\n",
 605                                   wps_dev_type_bin2str(attr.primary_dev_type,
 606                                                        devtype,
 607                                                        sizeof(devtype)));
 608                 if (ret < 0 || ret >= end - pos)
 609                         return pos - buf;
 610                 pos += ret;
 611         }
 612
 613         if (attr.dev_name) {
 614                 char *str = os_malloc(attr.dev_name_len + 1);
 615                 size_t i;
 616                 if (str == NULL)
 617                         return pos - buf;
 618                 for (i = 0; i < attr.dev_name_len; i++) {
 619                         if (attr.dev_name[i] < 32)
 620                                 str[i] = '_';
 621                         else
 622                                 str[i] = attr.dev_name[i];
 623                 }
 624                 str[i] = '\0';
 625                 ret = os_snprintf(pos, end - pos, "wps_device_name=%s\n", str);
 626                 os_free(str);
 627                 if (ret < 0 || ret >= end - pos)
 628                         return pos - buf;
 629                 pos += ret;
 630         }
 631
 632         if (attr.config_methods) {
 633                 ret = os_snprintf(pos, end - pos,
 634                                   "wps_config_methods=0x%04x\n",
 635                                   WPA_GET_BE16(attr.config_methods));
 636                 if (ret < 0 || ret >= end - pos)
 637                         return pos - buf;
 638                 pos += ret;
 639         }
 640
 641         return pos - buf;
 642 }