src/wps/wps.c

   1 /*
   2  * Wi-Fi Protected Setup
   3  * Copyright (c) 2007-2009, 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/dh_group5.h"
  19 #include "common/ieee802_11_defs.h"
  20 #include "wps_i.h"
  21 #include "wps_dev_attr.h"
  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 = data->wps->oob_dev_pw_id == 0 ?
  49                         DEV_PW_DEFAULT : data->wps->oob_dev_pw_id;
  50                 data->dev_password = os_malloc(cfg->pin_len);
  51                 if (data->dev_password == NULL) {
  52                         os_free(data);
  53                         return NULL;
  54                 }
  55                 os_memcpy(data->dev_password, cfg->pin, cfg->pin_len);
  56                 data->dev_password_len = cfg->pin_len;
  57         }
  58
  59         data->pbc = cfg->pbc;
  60         if (cfg->pbc) {
  61                 /* Use special PIN '00000000' for PBC */
  62                 data->dev_pw_id = DEV_PW_PUSHBUTTON;
  63                 os_free(data->dev_password);
  64                 data->dev_password = os_malloc(8);
  65                 if (data->dev_password == NULL) {
  66                         os_free(data);
  67                         return NULL;
  68                 }
  69                 os_memset(data->dev_password, '0', 8);
  70                 data->dev_password_len = 8;
  71         }
  72
  73         data->state = data->registrar ? RECV_M1 : SEND_M1;
  74
  75         if (cfg->assoc_wps_ie) {
  76                 struct wps_parse_attr attr;
  77                 wpa_hexdump_buf(MSG_DEBUG, "WPS: WPS IE from (Re)AssocReq",
  78                                 cfg->assoc_wps_ie);
  79                 if (wps_parse_msg(cfg->assoc_wps_ie, &attr) < 0) {
  80                         wpa_printf(MSG_DEBUG, "WPS: Failed to parse WPS IE "
  81                                    "from (Re)AssocReq");
  82                 } else if (attr.request_type == NULL) {
  83                         wpa_printf(MSG_DEBUG, "WPS: No Request Type attribute "
  84                                    "in (Re)AssocReq WPS IE");
  85                 } else {
  86                         wpa_printf(MSG_DEBUG, "WPS: Request Type (from WPS IE "
  87                                    "in (Re)AssocReq WPS IE): %d",
  88                                    *attr.request_type);
  89                         data->request_type = *attr.request_type;
  90                 }
  91         }
  92
  93         if (cfg->new_ap_settings) {
  94                 data->new_ap_settings =
  95                         os_malloc(sizeof(*data->new_ap_settings));
  96                 if (data->new_ap_settings == NULL) {
  97                         os_free(data);
  98                         return NULL;
  99                 }
 100                 os_memcpy(data->new_ap_settings, cfg->new_ap_settings,
 101                           sizeof(*data->new_ap_settings));
 102         }
 103
 104         if (cfg->peer_addr)
 105                 os_memcpy(data->peer_dev.mac_addr, cfg->peer_addr, ETH_ALEN);
 106
 107         data->use_psk_key = cfg->use_psk_key;
 108
 109         return data;
 110 }
 111
 112
 113 /**
 114  * wps_deinit - Deinitialize WPS Registration protocol data
 115  * @data: WPS Registration protocol data from wps_init()
 116  */
 117 void wps_deinit(struct wps_data *data)
 118 {
 119         if (data->wps_pin_revealed) {
 120                 wpa_printf(MSG_DEBUG, "WPS: Full PIN information revealed and "
 121                            "negotiation failed");
 122                 if (data->registrar)
 123                         wps_registrar_invalidate_pin(data->wps->registrar,
 124                                                      data->uuid_e);
 125         } else if (data->registrar)
 126                 wps_registrar_unlock_pin(data->wps->registrar, data->uuid_e);
 127
 128         wpabuf_free(data->dh_privkey);
 129         wpabuf_free(data->dh_pubkey_e);
 130         wpabuf_free(data->dh_pubkey_r);
 131         wpabuf_free(data->last_msg);
 132         os_free(data->dev_password);
 133         os_free(data->new_psk);
 134         wps_device_data_free(&data->peer_dev);
 135         os_free(data->new_ap_settings);
 136         dh5_free(data->dh_ctx);
 137         os_free(data);
 138 }
 139
 140
 141 /**
 142  * wps_process_msg - Process a WPS message
 143  * @wps: WPS Registration protocol data from wps_init()
 144  * @op_code: Message OP Code
 145  * @msg: Message data
 146  * Returns: Processing result
 147  *
 148  * This function is used to process WPS messages with OP Codes WSC_ACK,
 149  * WSC_NACK, WSC_MSG, and WSC_Done. The caller (e.g., EAP server/peer) is
 150  * responsible for reassembling the messages before calling this function.
 151  * Response to this message is built by calling wps_get_msg().
 152  */
 153 enum wps_process_res wps_process_msg(struct wps_data *wps,
 154                                      enum wsc_op_code op_code,
 155                                      const struct wpabuf *msg)
 156 {
 157         if (wps->registrar)
 158                 return wps_registrar_process_msg(wps, op_code, msg);
 159         else
 160                 return wps_enrollee_process_msg(wps, op_code, msg);
 161 }
 162
 163
 164 /**
 165  * wps_get_msg - Build a WPS message
 166  * @wps: WPS Registration protocol data from wps_init()
 167  * @op_code: Buffer for returning message OP Code
 168  * Returns: The generated WPS message or %NULL on failure
 169  *
 170  * This function is used to build a response to a message processed by calling
 171  * wps_process_msg(). The caller is responsible for freeing the buffer.
 172  */
 173 struct wpabuf * wps_get_msg(struct wps_data *wps, enum wsc_op_code *op_code)
 174 {
 175         if (wps->registrar)
 176                 return wps_registrar_get_msg(wps, op_code);
 177         else
 178                 return wps_enrollee_get_msg(wps, op_code);
 179 }
 180
 181
 182 /**
 183  * wps_is_selected_pbc_registrar - Check whether WPS IE indicates active PBC
 184  * @msg: WPS IE contents from Beacon or Probe Response frame
 185  * Returns: 1 if PBC Registrar is active, 0 if not
 186  */
 187 int wps_is_selected_pbc_registrar(const struct wpabuf *msg)
 188 {
 189         struct wps_parse_attr attr;
 190
 191         /*
 192          * In theory, this could also verify that attr.sel_reg_config_methods
 193          * includes WPS_CONFIG_PUSHBUTTON, but some deployed AP implementations
 194          * do not set Selected Registrar Config Methods attribute properly, so
 195          * it is safer to just use Device Password ID here.
 196          */
 197
 198         if (wps_parse_msg(msg, &attr) < 0 ||
 199             !attr.selected_registrar || *attr.selected_registrar == 0 ||
 200             !attr.dev_password_id ||
 201             WPA_GET_BE16(attr.dev_password_id) != DEV_PW_PUSHBUTTON)
 202                 return 0;
 203
 204         return 1;
 205 }
 206
 207
 208 /**
 209  * wps_is_selected_pin_registrar - Check whether WPS IE indicates active PIN
 210  * @msg: WPS IE contents from Beacon or Probe Response frame
 211  * Returns: 1 if PIN Registrar is active, 0 if not
 212  */
 213 int wps_is_selected_pin_registrar(const struct wpabuf *msg)
 214 {
 215         struct wps_parse_attr attr;
 216
 217         /*
 218          * In theory, this could also verify that attr.sel_reg_config_methods
 219          * includes WPS_CONFIG_LABEL, WPS_CONFIG_DISPLAY, or WPS_CONFIG_KEYPAD,
 220          * but some deployed AP implementations do not set Selected Registrar
 221          * Config Methods attribute properly, so it is safer to just use
 222          * Device Password ID here.
 223          */
 224
 225         if (wps_parse_msg(msg, &attr) < 0)
 226                 return 0;
 227
 228         if (!attr.selected_registrar || *attr.selected_registrar == 0)
 229                 return 0;
 230
 231         if (attr.dev_password_id != NULL &&
 232             WPA_GET_BE16(attr.dev_password_id) == DEV_PW_PUSHBUTTON)
 233                 return 0;
 234
 235         return 1;
 236 }
 237
 238
 239 /**
 240  * wps_get_uuid_e - Get UUID-E from WPS IE
 241  * @msg: WPS IE contents from Beacon or Probe Response frame
 242  * Returns: Pointer to UUID-E or %NULL if not included
 243  *
 244  * The returned pointer is to the msg contents and it remains valid only as
 245  * long as the msg buffer is valid.
 246  */
 247 const u8 * wps_get_uuid_e(const struct wpabuf *msg)
 248 {
 249         struct wps_parse_attr attr;
 250
 251         if (wps_parse_msg(msg, &attr) < 0)
 252                 return NULL;
 253         return attr.uuid_e;
 254 }
 255
 256
 257 /**
 258  * wps_build_assoc_req_ie - Build WPS IE for (Re)Association Request
 259  * @req_type: Value for Request Type attribute
 260  * Returns: WPS IE or %NULL on failure
 261  *
 262  * The caller is responsible for freeing the buffer.
 263  */
 264 struct wpabuf * wps_build_assoc_req_ie(enum wps_request_type req_type)
 265 {
 266         struct wpabuf *ie;
 267         u8 *len;
 268
 269         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
 270                    "Request");
 271         ie = wpabuf_alloc(100);
 272         if (ie == NULL)
 273                 return NULL;
 274
 275         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 276         len = wpabuf_put(ie, 1);
 277         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 278
 279         if (wps_build_version(ie) ||
 280             wps_build_req_type(ie, req_type)) {
 281                 wpabuf_free(ie);
 282                 return NULL;
 283         }
 284
 285         *len = wpabuf_len(ie) - 2;
 286
 287         return ie;
 288 }
 289
 290
 291 /**
 292  * wps_build_probe_req_ie - Build WPS IE for Probe Request
 293  * @pbc: Whether searching for PBC mode APs
 294  * @dev: Device attributes
 295  * @uuid: Own UUID
 296  * @req_type: Value for Request Type attribute
 297  * Returns: WPS IE or %NULL on failure
 298  *
 299  * The caller is responsible for freeing the buffer.
 300  */
 301 struct wpabuf * wps_build_probe_req_ie(int pbc, struct wps_device_data *dev,
 302                                        const u8 *uuid,
 303                                        enum wps_request_type req_type)
 304 {
 305         struct wpabuf *ie;
 306         u8 *len;
 307         u16 methods;
 308
 309         wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for Probe Request");
 310
 311         ie = wpabuf_alloc(200);
 312         if (ie == NULL)
 313                 return NULL;
 314
 315         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 316         len = wpabuf_put(ie, 1);
 317         wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 318
 319         if (pbc)
 320                 methods = WPS_CONFIG_PUSHBUTTON;
 321         else {
 322                 methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY |
 323                         WPS_CONFIG_KEYPAD;
 324 #ifdef CONFIG_WPS_UFD
 325                 methods |= WPS_CONFIG_USBA;
 326 #endif /* CONFIG_WPS_UFD */
 327 #ifdef CONFIG_WPS_NFC
 328                 methods |= WPS_CONFIG_NFC_INTERFACE;
 329 #endif /* CONFIG_WPS_NFC */
 330         }
 331
 332         if (wps_build_version(ie) ||
 333             wps_build_req_type(ie, req_type) ||
 334             wps_build_config_methods(ie, methods) ||
 335             wps_build_uuid_e(ie, uuid) ||
 336             wps_build_primary_dev_type(dev, ie) ||
 337             wps_build_rf_bands(dev, ie) ||
 338             wps_build_assoc_state(NULL, ie) ||
 339             wps_build_config_error(ie, WPS_CFG_NO_ERROR) ||
 340             wps_build_dev_password_id(ie, pbc ? DEV_PW_PUSHBUTTON :
 341                                       DEV_PW_DEFAULT)) {
 342                 wpabuf_free(ie);
 343                 return NULL;
 344         }
 345
 346         *len = wpabuf_len(ie) - 2;
 347
 348         return ie;
 349 }
 350
 351
 352 void wps_free_pending_msgs(struct upnp_pending_message *msgs)
 353 {
 354         struct upnp_pending_message *p, *prev;
 355         p = msgs;
 356         while (p) {
 357                 prev = p;
 358                 p = p->next;
 359                 wpabuf_free(prev->msg);
 360                 os_free(prev);
 361         }
 362 }
 363
 364
 365 int wps_attr_text(struct wpabuf *data, char *buf, char *end)
 366 {
 367         struct wps_parse_attr attr;
 368         char *pos = buf;
 369         int ret;
 370
 371         if (wps_parse_msg(data, &attr) < 0)
 372                 return -1;
 373
 374         if (attr.wps_state) {
 375                 if (*attr.wps_state == WPS_STATE_NOT_CONFIGURED)
 376                         ret = os_snprintf(pos, end - pos,
 377                                           "wps_state=unconfigured\n");
 378                 else if (*attr.wps_state == WPS_STATE_CONFIGURED)
 379                         ret = os_snprintf(pos, end - pos,
 380                                           "wps_state=configured\n");
 381                 else
 382                         ret = 0;
 383                 if (ret < 0 || ret >= end - pos)
 384                         return pos - buf;
 385                 pos += ret;
 386         }
 387
 388         if (attr.ap_setup_locked && *attr.ap_setup_locked) {
 389                 ret = os_snprintf(pos, end - pos,
 390                                   "wps_ap_setup_locked=1\n");
 391                 if (ret < 0 || ret >= end - pos)
 392                         return pos - buf;
 393                 pos += ret;
 394         }
 395
 396         if (attr.selected_registrar && *attr.selected_registrar) {
 397                 ret = os_snprintf(pos, end - pos,
 398                                   "wps_selected_registrar=1\n");
 399                 if (ret < 0 || ret >= end - pos)
 400                         return pos - buf;
 401                 pos += ret;
 402         }
 403
 404         if (attr.dev_password_id) {
 405                 ret = os_snprintf(pos, end - pos,
 406                                   "wps_device_password_id=%u\n",
 407                                   WPA_GET_BE16(attr.dev_password_id));
 408                 if (ret < 0 || ret >= end - pos)
 409                         return pos - buf;
 410                 pos += ret;
 411         }
 412
 413         if (attr.sel_reg_config_methods) {
 414                 ret = os_snprintf(pos, end - pos,
 415                                   "wps_selected_registrar_config_methods="
 416                                   "0x%04x\n",
 417                                   WPA_GET_BE16(attr.sel_reg_config_methods));
 418                 if (ret < 0 || ret >= end - pos)
 419                         return pos - buf;
 420                 pos += ret;
 421         }
 422
 423         if (attr.primary_dev_type) {
 424                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 425                 ret = os_snprintf(pos, end - pos,
 426                                   "wps_primary_device_type=%s\n",
 427                                   wps_dev_type_bin2str(attr.primary_dev_type,
 428                                                        devtype,
 429                                                        sizeof(devtype)));
 430                 if (ret < 0 || ret >= end - pos)
 431                         return pos - buf;
 432                 pos += ret;
 433         }
 434
 435         if (attr.dev_name) {
 436                 char *str = os_malloc(attr.dev_name_len + 1);
 437                 size_t i;
 438                 if (str == NULL)
 439                         return pos - buf;
 440                 for (i = 0; i < attr.dev_name_len; i++) {
 441                         if (attr.dev_name[i] < 32)
 442                                 str[i] = '_';
 443                         else
 444                                 str[i] = attr.dev_name[i];
 445                 }
 446                 str[i] = '\0';
 447                 ret = os_snprintf(pos, end - pos, "wps_device_name=%s\n", str);
 448                 os_free(str);
 449                 if (ret < 0 || ret >= end - pos)
 450                         return pos - buf;
 451                 pos += ret;
 452         }
 453
 454         if (attr.config_methods) {
 455                 ret = os_snprintf(pos, end - pos,
 456                                   "wps_config_methods=0x%04x\n",
 457                                   WPA_GET_BE16(attr.config_methods));
 458                 if (ret < 0 || ret >= end - pos)
 459                         return pos - buf;
 460                 pos += ret;
 461         }
 462
 463         return pos - buf;
 464 }