src/wps/wps_registrar.c

   1 /*
   2  * Wi-Fi Protected Setup - Registrar
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "sha256.h"
  19 #include "base64.h"
  20 #include "ieee802_11_defs.h"
  21 #include "eloop.h"
  22 #include "wps_i.h"
  23 #include "wps_dev_attr.h"
  24
  25
  26 struct wps_uuid_pin {
  27         struct wps_uuid_pin *next;
  28         u8 uuid[WPS_UUID_LEN];
  29         int wildcard_uuid;
  30         u8 *pin;
  31         size_t pin_len;
  32         int locked;
  33 };
  34
  35
  36 static void wps_free_pin(struct wps_uuid_pin *pin)
  37 {
  38         os_free(pin->pin);
  39         os_free(pin);
  40 }
  41
  42
  43 static void wps_free_pins(struct wps_uuid_pin *pins)
  44 {
  45         struct wps_uuid_pin *pin, *prev;
  46
  47         pin = pins;
  48         while (pin) {
  49                 prev = pin;
  50                 pin = pin->next;
  51                 wps_free_pin(prev);
  52         }
  53 }
  54
  55
  56 struct wps_pbc_session {
  57         struct wps_pbc_session *next;
  58         u8 addr[ETH_ALEN];
  59         u8 uuid_e[WPS_UUID_LEN];
  60         struct os_time timestamp;
  61 };
  62
  63
  64 static void wps_free_pbc_sessions(struct wps_pbc_session *pbc)
  65 {
  66         struct wps_pbc_session *prev;
  67
  68         while (pbc) {
  69                 prev = pbc;
  70                 pbc = pbc->next;
  71                 os_free(prev);
  72         }
  73 }
  74
  75
  76 struct wps_registrar {
  77         struct wps_context *wps;
  78
  79         int pbc;
  80         int selected_registrar;
  81
  82         int (*new_psk_cb)(void *ctx, const u8 *mac_addr, const u8 *psk,
  83                           size_t psk_len);
  84         int (*set_ie_cb)(void *ctx, const u8 *beacon_ie, size_t beacon_ie_len,
  85                          const u8 *probe_resp_ie, size_t probe_resp_ie_len);
  86         void (*pin_needed_cb)(void *ctx, const u8 *uuid_e,
  87                               const struct wps_device_data *dev);
  88         void *cb_ctx;
  89
  90         struct wps_uuid_pin *pins;
  91         struct wps_pbc_session *pbc_sessions;
  92 };
  93
  94
  95 static int wps_set_ie(struct wps_registrar *reg);
  96 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx);
  97
  98
  99 static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
 100                                           const u8 *addr, const u8 *uuid_e)
 101 {
 102         struct wps_pbc_session *pbc, *prev = NULL;
 103         struct os_time now;
 104
 105         os_get_time(&now);
 106
 107         pbc = reg->pbc_sessions;
 108         while (pbc) {
 109                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 110                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 111                         if (prev)
 112                                 prev->next = pbc->next;
 113                         else
 114                                 reg->pbc_sessions = pbc->next;
 115                         break;
 116                 }
 117                 prev = pbc;
 118                 pbc = pbc->next;
 119         }
 120
 121         if (!pbc) {
 122                 pbc = os_zalloc(sizeof(*pbc));
 123                 if (pbc == NULL)
 124                         return;
 125                 os_memcpy(pbc->addr, addr, ETH_ALEN);
 126                 if (uuid_e)
 127                         os_memcpy(pbc->uuid_e, uuid_e, WPS_UUID_LEN);
 128         }
 129
 130         pbc->next = reg->pbc_sessions;
 131         reg->pbc_sessions = pbc;
 132         pbc->timestamp = now;
 133
 134         /* remove entries that have timed out */
 135         prev = pbc;
 136         pbc = pbc->next;
 137
 138         while (pbc) {
 139                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME) {
 140                         prev->next = NULL;
 141                         wps_free_pbc_sessions(pbc);
 142                         break;
 143                 }
 144                 prev = pbc;
 145                 pbc = pbc->next;
 146         }
 147 }
 148
 149
 150 static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
 151                                              const u8 *addr, const u8 *uuid_e)
 152 {
 153         struct wps_pbc_session *pbc, *prev = NULL;
 154
 155         pbc = reg->pbc_sessions;
 156         while (pbc) {
 157                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 158                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 159                         if (prev)
 160                                 prev->next = pbc->next;
 161                         else
 162                                 reg->pbc_sessions = pbc->next;
 163                         os_free(pbc);
 164                         break;
 165                 }
 166                 prev = pbc;
 167                 pbc = pbc->next;
 168         }
 169 }
 170
 171
 172 int wps_registrar_pbc_overlap(struct wps_registrar *reg,
 173                               const u8 *addr, const u8 *uuid_e)
 174 {
 175         int count = 0;
 176         struct wps_pbc_session *pbc;
 177         struct os_time now;
 178
 179         os_get_time(&now);
 180
 181         for (pbc = reg->pbc_sessions; pbc; pbc = pbc->next) {
 182                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME)
 183                         break;
 184                 if (addr == NULL || os_memcmp(addr, pbc->addr, ETH_ALEN) ||
 185                     uuid_e == NULL ||
 186                     os_memcmp(uuid_e, pbc->uuid_e, WPS_UUID_LEN))
 187                         count++;
 188         }
 189
 190         if (addr || uuid_e)
 191                 count++;
 192
 193         return count > 1 ? 1 : 0;
 194 }
 195
 196
 197 static int wps_build_wps_state(struct wps_context *wps, struct wpabuf *msg)
 198 {
 199         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
 200                    wps->wps_state);
 201         wpabuf_put_be16(msg, ATTR_WPS_STATE);
 202         wpabuf_put_be16(msg, 1);
 203         wpabuf_put_u8(msg, wps->wps_state);
 204         return 0;
 205 }
 206
 207
 208 static int wps_build_ap_setup_locked(struct wps_context *wps,
 209                                      struct wpabuf *msg)
 210 {
 211         if (wps->ap_setup_locked) {
 212                 wpa_printf(MSG_DEBUG, "WPS:  * AP Setup Locked");
 213                 wpabuf_put_be16(msg, ATTR_AP_SETUP_LOCKED);
 214                 wpabuf_put_be16(msg, 1);
 215                 wpabuf_put_u8(msg, 1);
 216         }
 217         return 0;
 218 }
 219
 220
 221 static int wps_build_selected_registrar(struct wps_registrar *reg,
 222                                         struct wpabuf *msg)
 223 {
 224         if (!reg->selected_registrar)
 225                 return 0;
 226         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar");
 227         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR);
 228         wpabuf_put_be16(msg, 1);
 229         wpabuf_put_u8(msg, 1);
 230         return 0;
 231 }
 232
 233
 234 static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
 235                                              struct wpabuf *msg)
 236 {
 237         u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
 238         if (!reg->selected_registrar)
 239                 return 0;
 240         wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
 241         wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
 242         wpabuf_put_be16(msg, 2);
 243         wpabuf_put_be16(msg, id);
 244         return 0;
 245 }
 246
 247
 248 static int wps_build_sel_reg_config_methods(struct wps_registrar *reg,
 249                                             struct wpabuf *msg)
 250 {
 251         u16 methods;
 252         if (!reg->selected_registrar)
 253                 return 0;
 254         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 255         if (reg->pbc)
 256                 methods |= WPS_CONFIG_PUSHBUTTON;
 257         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar Config Methods (%x)",
 258                    methods);
 259         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR_CONFIG_METHODS);
 260         wpabuf_put_be16(msg, 2);
 261         wpabuf_put_be16(msg, methods);
 262         return 0;
 263 }
 264
 265
 266 static int wps_build_probe_config_methods(struct wps_registrar *reg,
 267                                           struct wpabuf *msg)
 268 {
 269         u16 methods;
 270         methods = 0;
 271         wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
 272         wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
 273         wpabuf_put_be16(msg, 2);
 274         wpabuf_put_be16(msg, methods);
 275         return 0;
 276 }
 277
 278
 279 static int wps_build_config_methods_r(struct wps_registrar *reg,
 280                                       struct wpabuf *msg)
 281 {
 282         u16 methods;
 283         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 284         if (reg->pbc)
 285                 methods |= WPS_CONFIG_PUSHBUTTON;
 286         return wps_build_config_methods(msg, methods);
 287 }
 288
 289
 290 static int wps_build_resp_type(struct wps_registrar *reg, struct wpabuf *msg)
 291 {
 292         u8 resp = reg->wps->ap ? WPS_RESP_AP : WPS_RESP_REGISTRAR;
 293         wpa_printf(MSG_DEBUG, "WPS:  * Response Type (%d)", resp);
 294         wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
 295         wpabuf_put_be16(msg, 1);
 296         wpabuf_put_u8(msg, resp);
 297         return 0;
 298 }
 299
 300
 301 struct wps_registrar *
 302 wps_registrar_init(struct wps_context *wps,
 303                    const struct wps_registrar_config *cfg)
 304 {
 305         struct wps_registrar *reg = os_zalloc(sizeof(*reg));
 306         if (reg == NULL)
 307                 return NULL;
 308
 309         reg->wps = wps;
 310         reg->new_psk_cb = cfg->new_psk_cb;
 311         reg->set_ie_cb = cfg->set_ie_cb;
 312         reg->pin_needed_cb = cfg->pin_needed_cb;
 313         reg->cb_ctx = cfg->cb_ctx;
 314
 315         if (wps_set_ie(reg)) {
 316                 wps_registrar_deinit(reg);
 317                 return NULL;
 318         }
 319
 320         return reg;
 321 }
 322
 323
 324 void wps_registrar_deinit(struct wps_registrar *reg)
 325 {
 326         if (reg == NULL)
 327                 return;
 328         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 329         wps_free_pins(reg->pins);
 330         wps_free_pbc_sessions(reg->pbc_sessions);
 331         os_free(reg);
 332 }
 333
 334
 335 int wps_registrar_add_pin(struct wps_registrar *reg, const u8 *uuid,
 336                           const u8 *pin, size_t pin_len)
 337 {
 338         struct wps_uuid_pin *p;
 339
 340         p = os_zalloc(sizeof(*p));
 341         if (p == NULL)
 342                 return -1;
 343         if (uuid == NULL)
 344                 p->wildcard_uuid = 1;
 345         else
 346                 os_memcpy(p->uuid, uuid, WPS_UUID_LEN);
 347         p->pin = os_malloc(pin_len);
 348         if (p->pin == NULL) {
 349                 os_free(p);
 350                 return -1;
 351         }
 352         os_memcpy(p->pin, pin, pin_len);
 353         p->pin_len = pin_len;
 354
 355         p->next = reg->pins;
 356         reg->pins = p;
 357
 358         wpa_printf(MSG_DEBUG, "WPS: A new PIN configured");
 359         wpa_hexdump(MSG_DEBUG, "WPS: UUID", uuid, WPS_UUID_LEN);
 360         wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: PIN", pin, pin_len);
 361         reg->selected_registrar = 1;
 362         reg->pbc = 0;
 363         wps_set_ie(reg);
 364
 365         return 0;
 366 }
 367
 368
 369 int wps_registrar_invalidate_pin(struct wps_registrar *reg, const u8 *uuid)
 370 {
 371         struct wps_uuid_pin *pin, *prev;
 372
 373         prev = NULL;
 374         pin = reg->pins;
 375         while (pin) {
 376                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 377                         if (prev == NULL)
 378                                 reg->pins = pin->next;
 379                         else
 380                                 prev->next = pin->next;
 381                         wpa_hexdump(MSG_DEBUG, "WPS: Invalidated PIN for UUID",
 382                                     pin->uuid, WPS_UUID_LEN);
 383                         wps_free_pin(pin);
 384                         return 0;
 385                 }
 386                 prev = pin;
 387                 pin = pin->next;
 388         }
 389
 390         return -1;
 391 }
 392
 393
 394 static const u8 * wps_registrar_get_pin(struct wps_registrar *reg,
 395                                         const u8 *uuid, size_t *pin_len)
 396 {
 397         struct wps_uuid_pin *pin;
 398
 399         pin = reg->pins;
 400         while (pin) {
 401                 if (!pin->wildcard_uuid &&
 402                     os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0)
 403                         break;
 404                 pin = pin->next;
 405         }
 406
 407         if (!pin) {
 408                 /* Check for wildcard UUIDs since none of the UUID-specific
 409                  * PINs matched */
 410                 pin = reg->pins;
 411                 while (pin) {
 412                         if (pin->wildcard_uuid == 1) {
 413                                 wpa_printf(MSG_DEBUG, "WPS: Found a wildcard "
 414                                            "PIN. Assigned it for this UUID-E");
 415                                 pin->wildcard_uuid = 2;
 416                                 os_memcpy(pin->uuid, uuid, WPS_UUID_LEN);
 417                                 break;
 418                         }
 419                         pin = pin->next;
 420                 }
 421         }
 422
 423         if (!pin)
 424                 return NULL;
 425
 426         /*
 427          * Lock the PIN to avoid attacks based on concurrent re-use of the PIN
 428          * that could otherwise avoid PIN invalidations.
 429          */
 430         if (pin->locked) {
 431                 wpa_printf(MSG_DEBUG, "WPS: Selected PIN locked - do not "
 432                            "allow concurrent re-use");
 433                 return NULL;
 434         }
 435         *pin_len = pin->pin_len;
 436         pin->locked = 1;
 437         return pin->pin;
 438 }
 439
 440
 441 int wps_registrar_unlock_pin(struct wps_registrar *reg, const u8 *uuid)
 442 {
 443         struct wps_uuid_pin *pin;
 444
 445         pin = reg->pins;
 446         while (pin) {
 447                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 448                         if (pin->wildcard_uuid == 2) {
 449                                 wpa_printf(MSG_DEBUG, "WPS: Invalidating used "
 450                                            "wildcard PIN");
 451                                 return wps_registrar_invalidate_pin(reg, uuid);
 452                         }
 453                         pin->locked = 0;
 454                         return 0;
 455                 }
 456                 pin = pin->next;
 457         }
 458
 459         return -1;
 460 }
 461
 462
 463 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx)
 464 {
 465         struct wps_registrar *reg = eloop_ctx;
 466
 467         wpa_printf(MSG_DEBUG, "WPS: PBC timed out - disable PBC mode");
 468         reg->selected_registrar = 0;
 469         reg->pbc = 0;
 470         wps_set_ie(reg);
 471 }
 472
 473
 474 int wps_registrar_button_pushed(struct wps_registrar *reg)
 475 {
 476         if (wps_registrar_pbc_overlap(reg, NULL, NULL)) {
 477                 wpa_printf(MSG_DEBUG, "WPS: PBC overlap - do not start PBC "
 478                            "mode");
 479                 return -1;
 480         }
 481         wpa_printf(MSG_DEBUG, "WPS: Button pushed - PBC mode started");
 482         reg->selected_registrar = 1;
 483         reg->pbc = 1;
 484         wps_set_ie(reg);
 485
 486         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 487         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wps_registrar_pbc_timeout,
 488                                reg, NULL);
 489         return 0;
 490 }
 491
 492
 493 static void wps_registrar_pbc_completed(struct wps_registrar *reg)
 494 {
 495         wpa_printf(MSG_DEBUG, "WPS: PBC completed - stopping PBC mode");
 496         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 497         reg->selected_registrar = 0;
 498         reg->pbc = 0;
 499         wps_set_ie(reg);
 500 }
 501
 502
 503 void wps_registrar_probe_req_rx(struct wps_registrar *reg, const u8 *addr,
 504                                 const struct wpabuf *wps_data)
 505 {
 506         struct wps_parse_attr attr;
 507         u16 methods;
 508
 509         wpa_hexdump_buf(MSG_MSGDUMP,
 510                         "WPS: Probe Request with WPS data received",
 511                         wps_data);
 512
 513         if (wps_parse_msg(wps_data, &attr) < 0 ||
 514             attr.version == NULL || *attr.version != WPS_VERSION) {
 515                 wpa_printf(MSG_DEBUG, "WPS: Unsupported ProbeReq WPS IE "
 516                            "version 0x%x", attr.version ? *attr.version : 0);
 517                 return;
 518         }
 519
 520         if (attr.config_methods == NULL) {
 521                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods attribute in "
 522                            "Probe Request");
 523                 return;
 524         }
 525
 526         methods = WPA_GET_BE16(attr.config_methods);
 527         if (!(methods & WPS_CONFIG_PUSHBUTTON))
 528                 return; /* Not PBC */
 529
 530         wpa_printf(MSG_DEBUG, "WPS: Probe Request for PBC received from "
 531                    MACSTR, MAC2STR(addr));
 532
 533         wps_registrar_add_pbc_session(reg, addr, attr.uuid_e);
 534 }
 535
 536
 537 static int wps_cb_new_psk(struct wps_registrar *reg, const u8 *mac_addr,
 538                           const u8 *psk, size_t psk_len)
 539 {
 540         if (reg->new_psk_cb == NULL)
 541                 return 0;
 542
 543         return reg->new_psk_cb(reg->cb_ctx, mac_addr, psk, psk_len);
 544 }
 545
 546
 547 static void wps_cb_pin_needed(struct wps_registrar *reg, const u8 *uuid_e,
 548                               const struct wps_device_data *dev)
 549 {
 550         if (reg->pin_needed_cb == NULL)
 551                 return;
 552
 553         reg->pin_needed_cb(reg->cb_ctx, uuid_e, dev);
 554 }
 555
 556
 557 static int wps_cb_set_ie(struct wps_registrar *reg,
 558                          const struct wpabuf *beacon_ie,
 559                          const struct wpabuf *probe_resp_ie)
 560 {
 561         if (reg->set_ie_cb == NULL)
 562                 return 0;
 563
 564         return reg->set_ie_cb(reg->cb_ctx, wpabuf_head(beacon_ie),
 565                               wpabuf_len(beacon_ie),
 566                               wpabuf_head(probe_resp_ie),
 567                               wpabuf_len(probe_resp_ie));
 568 }
 569
 570
 571 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
 572 static struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
 573 {
 574         struct wpabuf *ie;
 575         const u8 *pos, *end;
 576
 577         ie = wpabuf_alloc(wpabuf_len(data) + 100);
 578         if (ie == NULL) {
 579                 wpabuf_free(data);
 580                 return NULL;
 581         }
 582
 583         pos = wpabuf_head(data);
 584         end = pos + wpabuf_len(data);
 585
 586         while (end > pos) {
 587                 size_t frag_len = end - pos;
 588                 if (frag_len > 251)
 589                         frag_len = 251;
 590                 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 591                 wpabuf_put_u8(ie, 4 + frag_len);
 592                 wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 593                 wpabuf_put_data(ie, pos, frag_len);
 594                 pos += frag_len;
 595         }
 596
 597         wpabuf_free(data);
 598
 599         return ie;
 600 }
 601
 602
 603 static int wps_set_ie(struct wps_registrar *reg)
 604 {
 605         struct wpabuf *beacon;
 606         struct wpabuf *probe;
 607         int ret;
 608
 609         wpa_printf(MSG_DEBUG, "WPS: Build Beacon and Probe Response IEs");
 610
 611         beacon = wpabuf_alloc(300);
 612         if (beacon == NULL)
 613                 return -1;
 614         probe = wpabuf_alloc(400);
 615         if (probe == NULL) {
 616                 wpabuf_free(beacon);
 617                 return -1;
 618         }
 619
 620         if (wps_build_version(beacon) ||
 621             wps_build_wps_state(reg->wps, beacon) ||
 622             wps_build_ap_setup_locked(reg->wps, beacon) ||
 623             wps_build_selected_registrar(reg, beacon) ||
 624             wps_build_sel_reg_dev_password_id(reg, beacon) ||
 625             wps_build_sel_reg_config_methods(reg, beacon) ||
 626             wps_build_version(probe) ||
 627             wps_build_wps_state(reg->wps, probe) ||
 628             wps_build_ap_setup_locked(reg->wps, probe) ||
 629             wps_build_selected_registrar(reg, probe) ||
 630             wps_build_sel_reg_dev_password_id(reg, probe) ||
 631             wps_build_sel_reg_config_methods(reg, probe) ||
 632             wps_build_resp_type(reg, probe) ||
 633             wps_build_uuid_e(probe, reg->wps->uuid) ||
 634             wps_build_device_attrs(&reg->wps->dev, probe) ||
 635             wps_build_probe_config_methods(reg, probe) ||
 636             wps_build_rf_bands(&reg->wps->dev, probe)) {
 637                 wpabuf_free(beacon);
 638                 wpabuf_free(probe);
 639                 return -1;
 640         }
 641
 642         beacon = wps_ie_encapsulate(beacon);
 643         probe = wps_ie_encapsulate(probe);
 644
 645         if (!beacon || !probe) {
 646                 wpabuf_free(beacon);
 647                 wpabuf_free(probe);
 648                 return -1;
 649         }
 650
 651         ret = wps_cb_set_ie(reg, beacon, probe);
 652         wpabuf_free(beacon);
 653         wpabuf_free(probe);
 654
 655         return ret;
 656 }
 657
 658
 659 static int wps_get_dev_password(struct wps_data *wps)
 660 {
 661         const u8 *pin;
 662         size_t pin_len = 0;
 663
 664         os_free(wps->dev_password);
 665         wps->dev_password = NULL;
 666
 667         if (wps->pbc) {
 668                 wpa_printf(MSG_DEBUG, "WPS: Use default PIN for PBC");
 669                 pin = (const u8 *) "00000000";
 670                 pin_len = 8;
 671         } else {
 672                 pin = wps_registrar_get_pin(wps->registrar, wps->uuid_e,
 673                                             &pin_len);
 674         }
 675         if (pin == NULL) {
 676                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available for "
 677                            "the Enrollee");
 678                 wps_cb_pin_needed(wps->registrar, wps->uuid_e, &wps->peer_dev);
 679                 return -1;
 680         }
 681
 682         wps->dev_password = os_malloc(pin_len);
 683         if (wps->dev_password == NULL)
 684                 return -1;
 685         os_memcpy(wps->dev_password, pin, pin_len);
 686         wps->dev_password_len = pin_len;
 687
 688         return 0;
 689 }
 690
 691
 692 static int wps_build_uuid_r(struct wps_data *wps, struct wpabuf *msg)
 693 {
 694         wpa_printf(MSG_DEBUG, "WPS:  * UUID-R");
 695         wpabuf_put_be16(msg, ATTR_UUID_R);
 696         wpabuf_put_be16(msg, WPS_UUID_LEN);
 697         wpabuf_put_data(msg, wps->uuid_r, WPS_UUID_LEN);
 698         return 0;
 699 }
 700
 701
 702 static int wps_build_r_hash(struct wps_data *wps, struct wpabuf *msg)
 703 {
 704         u8 *hash;
 705         const u8 *addr[4];
 706         size_t len[4];
 707
 708         if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
 709                 return -1;
 710         wpa_hexdump(MSG_DEBUG, "WPS: R-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
 711         wpa_hexdump(MSG_DEBUG, "WPS: R-S2",
 712                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
 713
 714         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
 715                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
 716                            "R-Hash derivation");
 717                 return -1;
 718         }
 719
 720         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash1");
 721         wpabuf_put_be16(msg, ATTR_R_HASH1);
 722         wpabuf_put_be16(msg, SHA256_MAC_LEN);
 723         hash = wpabuf_put(msg, SHA256_MAC_LEN);
 724         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 725         addr[0] = wps->snonce;
 726         len[0] = WPS_SECRET_NONCE_LEN;
 727         addr[1] = wps->psk1;
 728         len[1] = WPS_PSK_LEN;
 729         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 730         len[2] = wpabuf_len(wps->dh_pubkey_e);
 731         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 732         len[3] = wpabuf_len(wps->dh_pubkey_r);
 733         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 734         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", hash, SHA256_MAC_LEN);
 735
 736         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash2");
 737         wpabuf_put_be16(msg, ATTR_R_HASH2);
 738         wpabuf_put_be16(msg, SHA256_MAC_LEN);
 739         hash = wpabuf_put(msg, SHA256_MAC_LEN);
 740         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 741         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
 742         addr[1] = wps->psk2;
 743         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 744         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", hash, SHA256_MAC_LEN);
 745
 746         return 0;
 747 }
 748
 749
 750 static int wps_build_r_snonce1(struct wps_data *wps, struct wpabuf *msg)
 751 {
 752         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce1");
 753         wpabuf_put_be16(msg, ATTR_R_SNONCE1);
 754         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 755         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
 756         return 0;
 757 }
 758
 759
 760 static int wps_build_r_snonce2(struct wps_data *wps, struct wpabuf *msg)
 761 {
 762         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce2");
 763         wpabuf_put_be16(msg, ATTR_R_SNONCE2);
 764         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 765         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
 766                         WPS_SECRET_NONCE_LEN);
 767         return 0;
 768 }
 769
 770
 771 static int wps_build_cred_network_idx(struct wpabuf *msg,
 772                                       struct wps_credential *cred)
 773 {
 774         wpa_printf(MSG_DEBUG, "WPS:  * Network Index");
 775         wpabuf_put_be16(msg, ATTR_NETWORK_INDEX);
 776         wpabuf_put_be16(msg, 1);
 777         wpabuf_put_u8(msg, 0);
 778         return 0;
 779 }
 780
 781
 782 static int wps_build_cred_ssid(struct wpabuf *msg,
 783                                struct wps_credential *cred)
 784 {
 785         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 786         wpabuf_put_be16(msg, ATTR_SSID);
 787         wpabuf_put_be16(msg, cred->ssid_len);
 788         wpabuf_put_data(msg, cred->ssid, cred->ssid_len);
 789         return 0;
 790 }
 791
 792
 793 static int wps_build_cred_auth_type(struct wpabuf *msg,
 794                                     struct wps_credential *cred)
 795 {
 796         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)",
 797                    cred->auth_type);
 798         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 799         wpabuf_put_be16(msg, 2);
 800         wpabuf_put_be16(msg, cred->auth_type);
 801         return 0;
 802 }
 803
 804
 805 static int wps_build_cred_encr_type(struct wpabuf *msg,
 806                                     struct wps_credential *cred)
 807 {
 808         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)",
 809                    cred->encr_type);
 810         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 811         wpabuf_put_be16(msg, 2);
 812         wpabuf_put_be16(msg, cred->encr_type);
 813         return 0;
 814 }
 815
 816
 817 static int wps_build_cred_network_key(struct wpabuf *msg,
 818                                       struct wps_credential *cred)
 819 {
 820         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 821         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 822         wpabuf_put_be16(msg, cred->key_len);
 823         wpabuf_put_data(msg, cred->key, cred->key_len);
 824         return 0;
 825 }
 826
 827
 828 static int wps_build_cred_mac_addr(struct wpabuf *msg,
 829                                    struct wps_credential *cred)
 830 {
 831         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address");
 832         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 833         wpabuf_put_be16(msg, ETH_ALEN);
 834         wpabuf_put_data(msg, cred->mac_addr, ETH_ALEN);
 835         return 0;
 836 }
 837
 838
 839 static int wps_build_credential(struct wpabuf *msg,
 840                                 struct wps_credential *cred)
 841 {
 842         if (wps_build_cred_network_idx(msg, cred) ||
 843             wps_build_cred_ssid(msg, cred) ||
 844             wps_build_cred_auth_type(msg, cred) ||
 845             wps_build_cred_encr_type(msg, cred) ||
 846             wps_build_cred_network_key(msg, cred) ||
 847             wps_build_cred_mac_addr(msg, cred))
 848                 return -1;
 849         return 0;
 850 }
 851
 852
 853 static int wps_build_cred(struct wps_data *wps, struct wpabuf *msg)
 854 {
 855         struct wpabuf *cred;
 856
 857         wpa_printf(MSG_DEBUG, "WPS:  * Credential");
 858         os_memset(&wps->cred, 0, sizeof(wps->cred));
 859
 860         os_memcpy(wps->cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
 861         wps->cred.ssid_len = wps->wps->ssid_len;
 862
 863         /* Select the best authentication and encryption type */
 864         if (wps->auth_type & WPS_AUTH_WPA2PSK)
 865                 wps->auth_type = WPS_AUTH_WPA2PSK;
 866         else if (wps->auth_type & WPS_AUTH_WPAPSK)
 867                 wps->auth_type = WPS_AUTH_WPAPSK;
 868         else if (wps->auth_type & WPS_AUTH_OPEN)
 869                 wps->auth_type = WPS_AUTH_OPEN;
 870         else if (wps->auth_type & WPS_AUTH_SHARED)
 871                 wps->auth_type = WPS_AUTH_SHARED;
 872         else {
 873                 wpa_printf(MSG_DEBUG, "WPS: Unsupported auth_type 0x%x",
 874                            wps->auth_type);
 875                 return -1;
 876         }
 877         wps->cred.auth_type = wps->auth_type;
 878
 879         if (wps->auth_type == WPS_AUTH_WPA2PSK ||
 880             wps->auth_type == WPS_AUTH_WPAPSK) {
 881                 if (wps->encr_type & WPS_ENCR_AES)
 882                         wps->encr_type = WPS_ENCR_AES;
 883                 else if (wps->encr_type & WPS_ENCR_TKIP)
 884                         wps->encr_type = WPS_ENCR_TKIP;
 885                 else {
 886                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
 887                                    "type for WPA/WPA2");
 888                         return -1;
 889                 }
 890         } else {
 891                 if (wps->encr_type & WPS_ENCR_WEP)
 892                         wps->encr_type = WPS_ENCR_WEP;
 893                 else if (wps->encr_type & WPS_ENCR_NONE)
 894                         wps->encr_type = WPS_ENCR_NONE;
 895                 else {
 896                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
 897                                    "type for non-WPA/WPA2 mode");
 898                         return -1;
 899                 }
 900         }
 901         wps->cred.encr_type = wps->encr_type;
 902         os_memcpy(wps->cred.mac_addr, wps->mac_addr_e, ETH_ALEN);
 903
 904         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->wps->ap) {
 905                 u8 r[16];
 906                 /* Generate a random passphrase */
 907                 if (os_get_random(r, sizeof(r)) < 0)
 908                         return -1;
 909                 os_free(wps->new_psk);
 910                 wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
 911                 if (wps->new_psk == NULL)
 912                         return -1;
 913                 wps->new_psk_len--; /* remove newline */
 914                 while (wps->new_psk_len &&
 915                        wps->new_psk[wps->new_psk_len - 1] == '=')
 916                         wps->new_psk_len--;
 917                 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Generated passphrase",
 918                                       wps->new_psk, wps->new_psk_len);
 919                 os_memcpy(wps->cred.key, wps->new_psk, wps->new_psk_len);
 920                 wps->cred.key_len = wps->new_psk_len;
 921         } else if (wps->wps->network_key) {
 922                 os_memcpy(wps->cred.key, wps->wps->network_key,
 923                           wps->wps->network_key_len);
 924                 wps->cred.key_len = wps->wps->network_key_len;
 925         } else if (wps->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
 926                 char hex[65];
 927                 /* Generate a random per-device PSK */
 928                 os_free(wps->new_psk);
 929                 wps->new_psk_len = 32;
 930                 wps->new_psk = os_malloc(wps->new_psk_len);
 931                 if (wps->new_psk == NULL)
 932                         return -1;
 933                 if (os_get_random(wps->new_psk, wps->new_psk_len) < 0) {
 934                         os_free(wps->new_psk);
 935                         wps->new_psk = NULL;
 936                         return -1;
 937                 }
 938                 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
 939                                 wps->new_psk, wps->new_psk_len);
 940                 wpa_snprintf_hex(hex, sizeof(hex), wps->new_psk,
 941                                  wps->new_psk_len);
 942                 os_memcpy(wps->cred.key, hex, wps->new_psk_len * 2);
 943                 wps->cred.key_len = wps->new_psk_len * 2;
 944         }
 945
 946         cred = wpabuf_alloc(200);
 947         if (cred == NULL)
 948                 return -1;
 949
 950         if (wps_build_credential(cred, &wps->cred)) {
 951                 wpabuf_free(cred);
 952                 return -1;
 953         }
 954
 955         wpabuf_put_be16(msg, ATTR_CRED);
 956         wpabuf_put_be16(msg, wpabuf_len(cred));
 957         wpabuf_put_buf(msg, cred);
 958         wpabuf_free(cred);
 959
 960         return 0;
 961 }
 962
 963
 964 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *msg)
 965 {
 966         wpa_printf(MSG_DEBUG, "WPS:  * AP Settings");
 967
 968         if (wps_build_credential(msg, &wps->cred))
 969                 return -1;
 970
 971         return 0;
 972 }
 973
 974
 975 static struct wpabuf * wps_build_m2(struct wps_data *wps)
 976 {
 977         struct wpabuf *msg;
 978
 979         if (os_get_random(wps->nonce_r, WPS_NONCE_LEN) < 0)
 980                 return NULL;
 981         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 982                     wps->nonce_r, WPS_NONCE_LEN);
 983         os_memcpy(wps->uuid_r, wps->wps->uuid, WPS_UUID_LEN);
 984         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 985
 986         wpa_printf(MSG_DEBUG, "WPS: Building Message M2");
 987         msg = wpabuf_alloc(1000);
 988         if (msg == NULL)
 989                 return NULL;
 990
 991         if (wps_build_version(msg) ||
 992             wps_build_msg_type(msg, WPS_M2) ||
 993             wps_build_enrollee_nonce(wps, msg) ||
 994             wps_build_registrar_nonce(wps, msg) ||
 995             wps_build_uuid_r(wps, msg) ||
 996             wps_build_public_key(wps, msg) ||
 997             wps_derive_keys(wps) ||
 998             wps_build_auth_type_flags(wps, msg) ||
 999             wps_build_encr_type_flags(wps, msg) ||
1000             wps_build_conn_type_flags(wps, msg) ||
1001             wps_build_config_methods_r(wps->registrar, msg) ||
1002             wps_build_device_attrs(&wps->wps->dev, msg) ||
1003             wps_build_rf_bands(&wps->wps->dev, msg) ||
1004             wps_build_assoc_state(wps, msg) ||
1005             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
1006             wps_build_dev_password_id(msg, DEV_PW_DEFAULT) ||
1007             wps_build_os_version(&wps->wps->dev, msg) ||
1008             wps_build_authenticator(wps, msg)) {
1009                 wpabuf_free(msg);
1010                 return NULL;
1011         }
1012
1013         wps->state = RECV_M3;
1014         return msg;
1015 }
1016
1017
1018 static struct wpabuf * wps_build_m2d(struct wps_data *wps)
1019 {
1020         struct wpabuf *msg;
1021         u16 err = WPS_CFG_NO_ERROR;
1022
1023         wpa_printf(MSG_DEBUG, "WPS: Building Message M2D");
1024         msg = wpabuf_alloc(1000);
1025         if (msg == NULL)
1026                 return NULL;
1027
1028         if (wps->authenticator && wps->wps->ap_setup_locked)
1029                 err = WPS_CFG_SETUP_LOCKED;
1030
1031         if (wps_build_version(msg) ||
1032             wps_build_msg_type(msg, WPS_M2D) ||
1033             wps_build_enrollee_nonce(wps, msg) ||
1034             wps_build_registrar_nonce(wps, msg) ||
1035             wps_build_uuid_r(wps, msg) ||
1036             wps_build_auth_type_flags(wps, msg) ||
1037             wps_build_encr_type_flags(wps, msg) ||
1038             wps_build_conn_type_flags(wps, msg) ||
1039             wps_build_config_methods_r(wps->registrar, msg) ||
1040             wps_build_device_attrs(&wps->wps->dev, msg) ||
1041             wps_build_rf_bands(&wps->wps->dev, msg) ||
1042             wps_build_assoc_state(wps, msg) ||
1043             wps_build_config_error(msg, err) ||
1044             wps_build_os_version(&wps->wps->dev, msg)) {
1045                 wpabuf_free(msg);
1046                 return NULL;
1047         }
1048
1049         wps->state = RECV_M2D_ACK;
1050         return msg;
1051 }
1052
1053
1054 static struct wpabuf * wps_build_m4(struct wps_data *wps)
1055 {
1056         struct wpabuf *msg, *plain;
1057
1058         wpa_printf(MSG_DEBUG, "WPS: Building Message M4");
1059
1060         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
1061
1062         plain = wpabuf_alloc(200);
1063         if (plain == NULL)
1064                 return NULL;
1065
1066         msg = wpabuf_alloc(1000);
1067         if (msg == NULL) {
1068                 wpabuf_free(plain);
1069                 return NULL;
1070         }
1071
1072         if (wps_build_version(msg) ||
1073             wps_build_msg_type(msg, WPS_M4) ||
1074             wps_build_enrollee_nonce(wps, msg) ||
1075             wps_build_r_hash(wps, msg) ||
1076             wps_build_r_snonce1(wps, plain) ||
1077             wps_build_key_wrap_auth(wps, plain) ||
1078             wps_build_encr_settings(wps, msg, plain) ||
1079             wps_build_authenticator(wps, msg)) {
1080                 wpabuf_free(plain);
1081                 wpabuf_free(msg);
1082                 return NULL;
1083         }
1084         wpabuf_free(plain);
1085
1086         wps->state = RECV_M5;
1087         return msg;
1088 }
1089
1090
1091 static struct wpabuf * wps_build_m6(struct wps_data *wps)
1092 {
1093         struct wpabuf *msg, *plain;
1094
1095         wpa_printf(MSG_DEBUG, "WPS: Building Message M6");
1096
1097         plain = wpabuf_alloc(200);
1098         if (plain == NULL)
1099                 return NULL;
1100
1101         msg = wpabuf_alloc(1000);
1102         if (msg == NULL) {
1103                 wpabuf_free(plain);
1104                 return NULL;
1105         }
1106
1107         if (wps_build_version(msg) ||
1108             wps_build_msg_type(msg, WPS_M6) ||
1109             wps_build_enrollee_nonce(wps, msg) ||
1110             wps_build_r_snonce2(wps, plain) ||
1111             wps_build_key_wrap_auth(wps, plain) ||
1112             wps_build_encr_settings(wps, msg, plain) ||
1113             wps_build_authenticator(wps, msg)) {
1114                 wpabuf_free(plain);
1115                 wpabuf_free(msg);
1116                 return NULL;
1117         }
1118         wpabuf_free(plain);
1119
1120         wps->wps_pin_revealed = 1;
1121         wps->state = RECV_M7;
1122         return msg;
1123 }
1124
1125
1126 static struct wpabuf * wps_build_m8(struct wps_data *wps)
1127 {
1128         struct wpabuf *msg, *plain;
1129
1130         wpa_printf(MSG_DEBUG, "WPS: Building Message M8");
1131
1132         plain = wpabuf_alloc(500);
1133         if (plain == NULL)
1134                 return NULL;
1135
1136         msg = wpabuf_alloc(1000);
1137         if (msg == NULL) {
1138                 wpabuf_free(plain);
1139                 return NULL;
1140         }
1141
1142         if (wps_build_version(msg) ||
1143             wps_build_msg_type(msg, WPS_M8) ||
1144             wps_build_enrollee_nonce(wps, msg) ||
1145             (wps->wps->ap && wps_build_cred(wps, plain)) ||
1146             (!wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
1147             wps_build_key_wrap_auth(wps, plain) ||
1148             wps_build_encr_settings(wps, msg, plain) ||
1149             wps_build_authenticator(wps, msg)) {
1150                 wpabuf_free(plain);
1151                 wpabuf_free(msg);
1152                 return NULL;
1153         }
1154         wpabuf_free(plain);
1155
1156         wps->state = RECV_DONE;
1157         return msg;
1158 }
1159
1160
1161 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
1162 {
1163         struct wpabuf *msg;
1164
1165         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
1166
1167         msg = wpabuf_alloc(1000);
1168         if (msg == NULL)
1169                 return NULL;
1170
1171         if (wps_build_version(msg) ||
1172             wps_build_msg_type(msg, WPS_WSC_ACK) ||
1173             wps_build_enrollee_nonce(wps, msg) ||
1174             wps_build_registrar_nonce(wps, msg)) {
1175                 wpabuf_free(msg);
1176                 return NULL;
1177         }
1178
1179         return msg;
1180 }
1181
1182
1183 struct wpabuf * wps_registrar_get_msg(struct wps_data *wps, u8 *op_code)
1184 {
1185         struct wpabuf *msg;
1186
1187         switch (wps->state) {
1188         case SEND_M2:
1189                 if (wps_get_dev_password(wps) < 0)
1190                         msg = wps_build_m2d(wps);
1191                 else
1192                         msg = wps_build_m2(wps);
1193                 *op_code = WSC_MSG;
1194                 break;
1195         case SEND_M2D:
1196                 msg = wps_build_m2d(wps);
1197                 *op_code = WSC_MSG;
1198                 break;
1199         case SEND_M4:
1200                 msg = wps_build_m4(wps);
1201                 *op_code = WSC_MSG;
1202                 break;
1203         case SEND_M6:
1204                 msg = wps_build_m6(wps);
1205                 *op_code = WSC_MSG;
1206                 break;
1207         case SEND_M8:
1208                 msg = wps_build_m8(wps);
1209                 *op_code = WSC_MSG;
1210                 break;
1211         case RECV_DONE:
1212                 msg = wps_build_wsc_ack(wps);
1213                 *op_code = WSC_ACK;
1214                 break;
1215         default:
1216                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
1217                            "a message", wps->state);
1218                 msg = NULL;
1219                 break;
1220         }
1221
1222         if (*op_code == WSC_MSG && msg) {
1223                 /* Save a copy of the last message for Authenticator derivation
1224                  */
1225                 wpabuf_free(wps->last_msg);
1226                 wps->last_msg = wpabuf_dup(msg);
1227         }
1228
1229         return msg;
1230 }
1231
1232
1233 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
1234 {
1235         if (e_nonce == NULL) {
1236                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
1237                 return -1;
1238         }
1239
1240         os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
1241         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
1242                     wps->nonce_e, WPS_NONCE_LEN);
1243
1244         return 0;
1245 }
1246
1247
1248 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
1249 {
1250         if (r_nonce == NULL) {
1251                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
1252                 return -1;
1253         }
1254
1255         if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
1256                 wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
1257                 return -1;
1258         }
1259
1260         return 0;
1261 }
1262
1263
1264 static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
1265 {
1266         if (uuid_e == NULL) {
1267                 wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
1268                 return -1;
1269         }
1270
1271         os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
1272         wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);
1273
1274         return 0;
1275 }
1276
1277
1278 static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
1279 {
1280         if (pw_id == NULL) {
1281                 wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
1282                 return -1;
1283         }
1284
1285         wps->dev_pw_id = WPA_GET_BE16(pw_id);
1286         wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);
1287
1288         return 0;
1289 }
1290
1291
1292 static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
1293 {
1294         if (e_hash1 == NULL) {
1295                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
1296                 return -1;
1297         }
1298
1299         os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
1300         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);
1301
1302         return 0;
1303 }
1304
1305
1306 static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
1307 {
1308         if (e_hash2 == NULL) {
1309                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
1310                 return -1;
1311         }
1312
1313         os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
1314         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);
1315
1316         return 0;
1317 }
1318
1319
1320 static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
1321 {
1322         u8 hash[SHA256_MAC_LEN];
1323         const u8 *addr[4];
1324         size_t len[4];
1325
1326         if (e_snonce1 == NULL) {
1327                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
1328                 return -1;
1329         }
1330
1331         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
1332                         WPS_SECRET_NONCE_LEN);
1333
1334         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
1335         addr[0] = e_snonce1;
1336         len[0] = WPS_SECRET_NONCE_LEN;
1337         addr[1] = wps->psk1;
1338         len[1] = WPS_PSK_LEN;
1339         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1340         len[2] = wpabuf_len(wps->dh_pubkey_e);
1341         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1342         len[3] = wpabuf_len(wps->dh_pubkey_r);
1343         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1344
1345         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
1346                 wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
1347                            "not match with the pre-committed value");
1348                 return -1;
1349         }
1350
1351         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
1352                    "half of the device password");
1353
1354         return 0;
1355 }
1356
1357
1358 static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
1359 {
1360         u8 hash[SHA256_MAC_LEN];
1361         const u8 *addr[4];
1362         size_t len[4];
1363
1364         if (e_snonce2 == NULL) {
1365                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
1366                 return -1;
1367         }
1368
1369         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
1370                         WPS_SECRET_NONCE_LEN);
1371
1372         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
1373         addr[0] = e_snonce2;
1374         len[0] = WPS_SECRET_NONCE_LEN;
1375         addr[1] = wps->psk2;
1376         len[1] = WPS_PSK_LEN;
1377         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1378         len[2] = wpabuf_len(wps->dh_pubkey_e);
1379         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1380         len[3] = wpabuf_len(wps->dh_pubkey_r);
1381         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1382
1383         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
1384                 wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
1385                            "not match with the pre-committed value");
1386                 wps_registrar_invalidate_pin(wps->registrar, wps->uuid_e);
1387                 return -1;
1388         }
1389
1390         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
1391                    "half of the device password");
1392         wps->wps_pin_revealed = 0;
1393         wps_registrar_unlock_pin(wps->registrar, wps->uuid_e);
1394
1395         return 0;
1396 }
1397
1398
1399 static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
1400 {
1401         if (mac_addr == NULL) {
1402                 wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
1403                 return -1;
1404         }
1405
1406         wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
1407                    MAC2STR(mac_addr));
1408         os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
1409         os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);
1410
1411         return 0;
1412 }
1413
1414
1415 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
1416                               size_t pk_len)
1417 {
1418         if (pk == NULL || pk_len == 0) {
1419                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
1420                 return -1;
1421         }
1422
1423         wpabuf_free(wps->dh_pubkey_e);
1424         wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
1425         if (wps->dh_pubkey_e == NULL)
1426                 return -1;
1427
1428         return 0;
1429 }
1430
1431
1432 static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
1433 {
1434         u16 auth_types;
1435
1436         if (auth == NULL) {
1437                 wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
1438                            "received");
1439                 return -1;
1440         }
1441
1442         auth_types = WPA_GET_BE16(auth);
1443
1444         wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
1445                    auth_types);
1446         wps->auth_type = wps->wps->auth_types & auth_types;
1447         if (wps->auth_type == 0) {
1448                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1449                            "authentication types (own 0x%x Enrollee 0x%x)",
1450                            wps->wps->auth_types, auth_types);
1451                 return -1;
1452         }
1453
1454         return 0;
1455 }
1456
1457
1458 static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
1459 {
1460         u16 encr_types;
1461
1462         if (encr == NULL) {
1463                 wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
1464                            "received");
1465                 return -1;
1466         }
1467
1468         encr_types = WPA_GET_BE16(encr);
1469
1470         wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
1471                    encr_types);
1472         wps->encr_type = wps->wps->encr_types & encr_types;
1473         if (wps->encr_type == 0) {
1474                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1475                            "encryption types");
1476                 return -1;
1477         }
1478
1479         return 0;
1480 }
1481
1482
1483 static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
1484 {
1485         if (conn == NULL) {
1486                 wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
1487                            "received");
1488                 return -1;
1489         }
1490
1491         wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
1492                    *conn);
1493
1494         return 0;
1495 }
1496
1497
1498 static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
1499 {
1500         u16 m;
1501
1502         if (methods == NULL) {
1503                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
1504                 return -1;
1505         }
1506
1507         m = WPA_GET_BE16(methods);
1508
1509         wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
1510
1511         return 0;
1512 }
1513
1514
1515 static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
1516 {
1517         if (state == NULL) {
1518                 wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
1519                            "received");
1520                 return -1;
1521         }
1522
1523         wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
1524                    *state);
1525
1526         return 0;
1527 }
1528
1529
1530 static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
1531 {
1532         u16 a;
1533
1534         if (assoc == NULL) {
1535                 wpa_printf(MSG_DEBUG, "WPS: No Association State received");
1536                 return -1;
1537         }
1538
1539         a = WPA_GET_BE16(assoc);
1540         wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);
1541
1542         return 0;
1543 }
1544
1545
1546 static int wps_process_config_error(struct wps_data *wps, const u8 *err)
1547 {
1548         u16 e;
1549
1550         if (err == NULL) {
1551                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
1552                 return -1;
1553         }
1554
1555         e = WPA_GET_BE16(err);
1556         wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);
1557
1558         return 0;
1559 }
1560
1561
1562 static enum wps_process_res wps_process_m1(struct wps_data *wps,
1563                                            struct wps_parse_attr *attr)
1564 {
1565         wpa_printf(MSG_DEBUG, "WPS: Received M1");
1566
1567         if (wps->state != RECV_M1) {
1568                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1569                            "receiving M1", wps->state);
1570                 return WPS_FAILURE;
1571         }
1572
1573         if (wps_process_uuid_e(wps, attr->uuid_e) ||
1574             wps_process_mac_addr(wps, attr->mac_addr) ||
1575             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1576             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
1577             wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
1578             wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
1579             wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
1580             wps_process_config_methods(wps, attr->config_methods) ||
1581             wps_process_wps_state(wps, attr->wps_state) ||
1582             wps_process_device_attrs(&wps->peer_dev, attr) ||
1583             wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
1584             wps_process_assoc_state(wps, attr->assoc_state) ||
1585             wps_process_dev_password_id(wps, attr->dev_password_id) ||
1586             wps_process_config_error(wps, attr->config_error) ||
1587             wps_process_os_version(&wps->peer_dev, attr->os_version))
1588                 return WPS_FAILURE;
1589
1590         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
1591             wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
1592             wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
1593             wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
1594             (wps->dev_pw_id != DEV_PW_PUSHBUTTON || !wps->registrar->pbc)) {
1595                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
1596                            wps->dev_pw_id);
1597                 wps->state = SEND_M2D;
1598                 return WPS_CONTINUE;
1599         }
1600
1601         if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
1602                 if (wps_registrar_pbc_overlap(wps->registrar, wps->mac_addr_e,
1603                                               wps->uuid_e)) {
1604                         wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
1605                                    "negotiation");
1606                         wps->state = SEND_M2D;
1607                         return WPS_CONTINUE;
1608                 }
1609                 wps_registrar_add_pbc_session(wps->registrar, wps->mac_addr_e,
1610                                               wps->uuid_e);
1611                 wps->pbc = 1;
1612         }
1613
1614         wps->state = SEND_M2;
1615         return WPS_CONTINUE;
1616 }
1617
1618
1619 static enum wps_process_res wps_process_m3(struct wps_data *wps,
1620                                            const struct wpabuf *msg,
1621                                            struct wps_parse_attr *attr)
1622 {
1623         wpa_printf(MSG_DEBUG, "WPS: Received M3");
1624
1625         if (wps->state != RECV_M3) {
1626                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1627                            "receiving M3", wps->state);
1628                 return WPS_FAILURE;
1629         }
1630
1631         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1632             wps_process_authenticator(wps, attr->authenticator, msg) ||
1633             wps_process_e_hash1(wps, attr->e_hash1) ||
1634             wps_process_e_hash2(wps, attr->e_hash2))
1635                 return WPS_FAILURE;
1636
1637         wps->state = SEND_M4;
1638         return WPS_CONTINUE;
1639 }
1640
1641
1642 static enum wps_process_res wps_process_m5(struct wps_data *wps,
1643                                            const struct wpabuf *msg,
1644                                            struct wps_parse_attr *attr)
1645 {
1646         struct wpabuf *decrypted;
1647         struct wps_parse_attr eattr;
1648
1649         wpa_printf(MSG_DEBUG, "WPS: Received M5");
1650
1651         if (wps->state != RECV_M5) {
1652                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1653                            "receiving M5", wps->state);
1654                 return WPS_FAILURE;
1655         }
1656
1657         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1658             wps_process_authenticator(wps, attr->authenticator, msg))
1659                 return WPS_FAILURE;
1660
1661         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1662                                               attr->encr_settings_len);
1663         if (decrypted == NULL) {
1664                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1665                            "Settings attribute");
1666                 return WPS_FAILURE;
1667         }
1668
1669         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1670                    "attribute");
1671         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1672             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1673             wps_process_e_snonce1(wps, eattr.e_snonce1)) {
1674                 wpabuf_free(decrypted);
1675                 return WPS_FAILURE;
1676         }
1677         wpabuf_free(decrypted);
1678
1679         wps->state = SEND_M6;
1680         return WPS_CONTINUE;
1681 }
1682
1683
1684 static int wps_process_ap_settings_r(struct wps_data *wps,
1685                                      struct wps_parse_attr *attr)
1686 {
1687         if (wps->wps->ap)
1688                 return 0;
1689
1690         /* AP Settings Attributes in M7 when Enrollee is an AP */
1691         if (wps_process_ap_settings(attr, &wps->cred) < 0)
1692                 return -1;
1693
1694         wpa_printf(MSG_INFO, "WPS: Received old AP configuration from AP");
1695
1696         /*
1697          * TODO: Provide access to AP settings and allow changes before sending
1698          * out M8. For now, just copy the settings unchanged into M8.
1699          */
1700
1701         return 0;
1702 }
1703
1704
1705 static enum wps_process_res wps_process_m7(struct wps_data *wps,
1706                                            const struct wpabuf *msg,
1707                                            struct wps_parse_attr *attr)
1708 {
1709         struct wpabuf *decrypted;
1710         struct wps_parse_attr eattr;
1711
1712         wpa_printf(MSG_DEBUG, "WPS: Received M7");
1713
1714         if (wps->state != RECV_M7) {
1715                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1716                            "receiving M7", wps->state);
1717                 return WPS_FAILURE;
1718         }
1719
1720         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1721             wps_process_authenticator(wps, attr->authenticator, msg))
1722                 return WPS_FAILURE;
1723
1724         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1725                                               attr->encr_settings_len);
1726         if (decrypted == NULL) {
1727                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1728                            "Settings attribute");
1729                 return WPS_FAILURE;
1730         }
1731
1732         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1733                    "attribute");
1734         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1735             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1736             wps_process_e_snonce2(wps, eattr.e_snonce2) ||
1737             wps_process_ap_settings_r(wps, &eattr)) {
1738                 wpabuf_free(decrypted);
1739                 return WPS_FAILURE;
1740         }
1741
1742         wpabuf_free(decrypted);
1743
1744         wps->state = SEND_M8;
1745         return WPS_CONTINUE;
1746 }
1747
1748
1749 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1750                                                 const struct wpabuf *msg)
1751 {
1752         struct wps_parse_attr attr;
1753         enum wps_process_res ret = WPS_CONTINUE;
1754
1755         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1756
1757         if (wps_parse_msg(msg, &attr) < 0)
1758                 return WPS_FAILURE;
1759
1760         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1761                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1762                            attr.version ? *attr.version : 0);
1763                 return WPS_FAILURE;
1764         }
1765
1766         if (attr.msg_type == NULL) {
1767                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1768                 return WPS_FAILURE;
1769         }
1770
1771         if (*attr.msg_type != WPS_M1 &&
1772             (attr.registrar_nonce == NULL ||
1773              os_memcmp(wps->nonce_r, attr.registrar_nonce,
1774                        WPS_NONCE_LEN != 0))) {
1775                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1776                 return WPS_FAILURE;
1777         }
1778
1779         switch (*attr.msg_type) {
1780         case WPS_M1:
1781                 ret = wps_process_m1(wps, &attr);
1782                 break;
1783         case WPS_M3:
1784                 ret = wps_process_m3(wps, msg, &attr);
1785                 break;
1786         case WPS_M5:
1787                 ret = wps_process_m5(wps, msg, &attr);
1788                 break;
1789         case WPS_M7:
1790                 ret = wps_process_m7(wps, msg, &attr);
1791                 break;
1792         default:
1793                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1794                            *attr.msg_type);
1795                 return WPS_FAILURE;
1796         }
1797
1798         if (ret == WPS_CONTINUE) {
1799                 /* Save a copy of the last message for Authenticator derivation
1800                  */
1801                 wpabuf_free(wps->last_msg);
1802                 wps->last_msg = wpabuf_dup(msg);
1803         }
1804
1805         return ret;
1806 }
1807
1808
1809 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1810                                                 const struct wpabuf *msg)
1811 {
1812         struct wps_parse_attr attr;
1813
1814         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1815
1816         if (wps_parse_msg(msg, &attr) < 0)
1817                 return WPS_FAILURE;
1818
1819         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1820                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1821                            attr.version ? *attr.version : 0);
1822                 return WPS_FAILURE;
1823         }
1824
1825         if (attr.msg_type == NULL) {
1826                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1827                 return WPS_FAILURE;
1828         }
1829
1830         if (*attr.msg_type != WPS_WSC_ACK) {
1831                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1832                            *attr.msg_type);
1833                 return WPS_FAILURE;
1834         }
1835
1836         if (attr.registrar_nonce == NULL ||
1837             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1838         {
1839                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1840                 return WPS_FAILURE;
1841         }
1842
1843         if (attr.enrollee_nonce == NULL ||
1844             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1845                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1846                 return WPS_FAILURE;
1847         }
1848
1849         if (wps->state == RECV_M2D_ACK) {
1850                 /* TODO: support for multiple registrars and sending of
1851                  * multiple M2/M2D messages */
1852
1853                 wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
1854                            "terminate negotiation");
1855         }
1856
1857         return WPS_FAILURE;
1858 }
1859
1860
1861 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1862                                                  const struct wpabuf *msg)
1863 {
1864         struct wps_parse_attr attr;
1865
1866         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1867
1868         if (wps_parse_msg(msg, &attr) < 0)
1869                 return WPS_FAILURE;
1870
1871         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1872                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1873                            attr.version ? *attr.version : 0);
1874                 return WPS_FAILURE;
1875         }
1876
1877         if (attr.msg_type == NULL) {
1878                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1879                 return WPS_FAILURE;
1880         }
1881
1882         if (*attr.msg_type != WPS_WSC_NACK) {
1883                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1884                            *attr.msg_type);
1885                 return WPS_FAILURE;
1886         }
1887
1888         if (attr.registrar_nonce == NULL ||
1889             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1890         {
1891                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1892                 return WPS_FAILURE;
1893         }
1894
1895         if (attr.enrollee_nonce == NULL ||
1896             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1897                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1898                 return WPS_FAILURE;
1899         }
1900
1901         if (attr.config_error == NULL) {
1902                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1903                            "in WSC_NACK");
1904                 return WPS_FAILURE;
1905         }
1906
1907         wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
1908                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1909
1910         return WPS_FAILURE;
1911 }
1912
1913
1914 static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
1915                                                  const struct wpabuf *msg)
1916 {
1917         struct wps_parse_attr attr;
1918
1919         wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");
1920
1921         if (wps->state != RECV_DONE) {
1922                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1923                            "receiving WSC_Done", wps->state);
1924                 return WPS_FAILURE;
1925         }
1926
1927         if (wps_parse_msg(msg, &attr) < 0)
1928                 return WPS_FAILURE;
1929
1930         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1931                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1932                            attr.version ? *attr.version : 0);
1933                 return WPS_FAILURE;
1934         }
1935
1936         if (attr.msg_type == NULL) {
1937                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1938                 return WPS_FAILURE;
1939         }
1940
1941         if (*attr.msg_type != WPS_WSC_DONE) {
1942                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1943                            *attr.msg_type);
1944                 return WPS_FAILURE;
1945         }
1946
1947         if (attr.registrar_nonce == NULL ||
1948             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1949         {
1950                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1951                 return WPS_FAILURE;
1952         }
1953
1954         if (attr.enrollee_nonce == NULL ||
1955             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1956                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1957                 return WPS_FAILURE;
1958         }
1959
1960         wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
1961
1962         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
1963             wps->wps->ap) {
1964                 struct wps_credential cred;
1965
1966                 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
1967                            "on first Enrollee connection");
1968
1969                 os_memset(&cred, 0, sizeof(cred));
1970                 os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
1971                 cred.ssid_len = wps->wps->ssid_len;
1972                 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
1973                 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
1974                 os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
1975                 cred.key_len = wps->new_psk_len;
1976
1977                 wps->wps->wps_state = WPS_STATE_CONFIGURED;
1978                 wpa_hexdump_ascii_key(MSG_DEBUG,
1979                                       "WPS: Generated random passphrase",
1980                                       wps->new_psk, wps->new_psk_len);
1981                 if (wps->wps->cred_cb)
1982                         wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
1983
1984                 os_free(wps->new_psk);
1985                 wps->new_psk = NULL;
1986         }
1987
1988         if (!wps->wps->ap) {
1989                 wpa_printf(MSG_DEBUG, "WPS: Update local configuration based "
1990                            "on the modified AP configuration");
1991                 if (wps->wps->cred_cb)
1992                         wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
1993         }
1994
1995         if (wps->new_psk) {
1996                 if (wps_cb_new_psk(wps->registrar, wps->mac_addr_e,
1997                                    wps->new_psk, wps->new_psk_len)) {
1998                         wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
1999                                    "new PSK");
2000                 }
2001                 os_free(wps->new_psk);
2002                 wps->new_psk = NULL;
2003         }
2004
2005         if (wps->pbc) {
2006                 wps_registrar_remove_pbc_session(wps->registrar,
2007                                                  wps->mac_addr_e, wps->uuid_e);
2008                 wps_registrar_pbc_completed(wps->registrar);
2009         }
2010
2011         return WPS_DONE;
2012 }
2013
2014
2015 enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
2016                                                u8 op_code,
2017                                                const struct wpabuf *msg)
2018 {
2019
2020         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
2021                    "op_code=%d)",
2022                    (unsigned long) wpabuf_len(msg), op_code);
2023
2024         switch (op_code) {
2025         case WSC_MSG:
2026                 return wps_process_wsc_msg(wps, msg);
2027         case WSC_ACK:
2028                 return wps_process_wsc_ack(wps, msg);
2029         case WSC_NACK:
2030                 return wps_process_wsc_nack(wps, msg);
2031         case WSC_Done:
2032                 return wps_process_wsc_done(wps, msg);
2033         default:
2034                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
2035                 return WPS_FAILURE;
2036         }
2037 }