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 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
1184 {
1185         struct wpabuf *msg;
1186
1187         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
1188
1189         msg = wpabuf_alloc(1000);
1190         if (msg == NULL)
1191                 return NULL;
1192
1193         if (wps_build_version(msg) ||
1194             wps_build_msg_type(msg, WPS_WSC_NACK) ||
1195             wps_build_enrollee_nonce(wps, msg) ||
1196             wps_build_registrar_nonce(wps, msg) ||
1197             wps_build_config_error(msg, wps->config_error)) {
1198                 wpabuf_free(msg);
1199                 return NULL;
1200         }
1201
1202         return msg;
1203 }
1204
1205
1206 struct wpabuf * wps_registrar_get_msg(struct wps_data *wps, u8 *op_code)
1207 {
1208         struct wpabuf *msg;
1209
1210         switch (wps->state) {
1211         case SEND_M2:
1212                 if (wps_get_dev_password(wps) < 0)
1213                         msg = wps_build_m2d(wps);
1214                 else
1215                         msg = wps_build_m2(wps);
1216                 *op_code = WSC_MSG;
1217                 break;
1218         case SEND_M2D:
1219                 msg = wps_build_m2d(wps);
1220                 *op_code = WSC_MSG;
1221                 break;
1222         case SEND_M4:
1223                 msg = wps_build_m4(wps);
1224                 *op_code = WSC_MSG;
1225                 break;
1226         case SEND_M6:
1227                 msg = wps_build_m6(wps);
1228                 *op_code = WSC_MSG;
1229                 break;
1230         case SEND_M8:
1231                 msg = wps_build_m8(wps);
1232                 *op_code = WSC_MSG;
1233                 break;
1234         case RECV_DONE:
1235                 msg = wps_build_wsc_ack(wps);
1236                 *op_code = WSC_ACK;
1237                 break;
1238         case SEND_WSC_NACK:
1239                 msg = wps_build_wsc_nack(wps);
1240                 *op_code = WSC_NACK;
1241                 break;
1242         default:
1243                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
1244                            "a message", wps->state);
1245                 msg = NULL;
1246                 break;
1247         }
1248
1249         if (*op_code == WSC_MSG && msg) {
1250                 /* Save a copy of the last message for Authenticator derivation
1251                  */
1252                 wpabuf_free(wps->last_msg);
1253                 wps->last_msg = wpabuf_dup(msg);
1254         }
1255
1256         return msg;
1257 }
1258
1259
1260 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
1261 {
1262         if (e_nonce == NULL) {
1263                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
1264                 return -1;
1265         }
1266
1267         os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
1268         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
1269                     wps->nonce_e, WPS_NONCE_LEN);
1270
1271         return 0;
1272 }
1273
1274
1275 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
1276 {
1277         if (r_nonce == NULL) {
1278                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
1279                 return -1;
1280         }
1281
1282         if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
1283                 wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
1284                 return -1;
1285         }
1286
1287         return 0;
1288 }
1289
1290
1291 static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
1292 {
1293         if (uuid_e == NULL) {
1294                 wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
1295                 return -1;
1296         }
1297
1298         os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
1299         wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);
1300
1301         return 0;
1302 }
1303
1304
1305 static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
1306 {
1307         if (pw_id == NULL) {
1308                 wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
1309                 return -1;
1310         }
1311
1312         wps->dev_pw_id = WPA_GET_BE16(pw_id);
1313         wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);
1314
1315         return 0;
1316 }
1317
1318
1319 static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
1320 {
1321         if (e_hash1 == NULL) {
1322                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
1323                 return -1;
1324         }
1325
1326         os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
1327         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);
1328
1329         return 0;
1330 }
1331
1332
1333 static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
1334 {
1335         if (e_hash2 == NULL) {
1336                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
1337                 return -1;
1338         }
1339
1340         os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
1341         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);
1342
1343         return 0;
1344 }
1345
1346
1347 static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
1348 {
1349         u8 hash[SHA256_MAC_LEN];
1350         const u8 *addr[4];
1351         size_t len[4];
1352
1353         if (e_snonce1 == NULL) {
1354                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
1355                 return -1;
1356         }
1357
1358         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
1359                         WPS_SECRET_NONCE_LEN);
1360
1361         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
1362         addr[0] = e_snonce1;
1363         len[0] = WPS_SECRET_NONCE_LEN;
1364         addr[1] = wps->psk1;
1365         len[1] = WPS_PSK_LEN;
1366         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1367         len[2] = wpabuf_len(wps->dh_pubkey_e);
1368         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1369         len[3] = wpabuf_len(wps->dh_pubkey_r);
1370         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1371
1372         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
1373                 wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
1374                            "not match with the pre-committed value");
1375                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1376                 return -1;
1377         }
1378
1379         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
1380                    "half of the device password");
1381
1382         return 0;
1383 }
1384
1385
1386 static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
1387 {
1388         u8 hash[SHA256_MAC_LEN];
1389         const u8 *addr[4];
1390         size_t len[4];
1391
1392         if (e_snonce2 == NULL) {
1393                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
1394                 return -1;
1395         }
1396
1397         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
1398                         WPS_SECRET_NONCE_LEN);
1399
1400         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
1401         addr[0] = e_snonce2;
1402         len[0] = WPS_SECRET_NONCE_LEN;
1403         addr[1] = wps->psk2;
1404         len[1] = WPS_PSK_LEN;
1405         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1406         len[2] = wpabuf_len(wps->dh_pubkey_e);
1407         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1408         len[3] = wpabuf_len(wps->dh_pubkey_r);
1409         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1410
1411         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
1412                 wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
1413                            "not match with the pre-committed value");
1414                 wps_registrar_invalidate_pin(wps->registrar, wps->uuid_e);
1415                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1416                 return -1;
1417         }
1418
1419         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
1420                    "half of the device password");
1421         wps->wps_pin_revealed = 0;
1422         wps_registrar_unlock_pin(wps->registrar, wps->uuid_e);
1423
1424         return 0;
1425 }
1426
1427
1428 static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
1429 {
1430         if (mac_addr == NULL) {
1431                 wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
1432                 return -1;
1433         }
1434
1435         wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
1436                    MAC2STR(mac_addr));
1437         os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
1438         os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);
1439
1440         return 0;
1441 }
1442
1443
1444 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
1445                               size_t pk_len)
1446 {
1447         if (pk == NULL || pk_len == 0) {
1448                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
1449                 return -1;
1450         }
1451
1452         wpabuf_free(wps->dh_pubkey_e);
1453         wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
1454         if (wps->dh_pubkey_e == NULL)
1455                 return -1;
1456
1457         return 0;
1458 }
1459
1460
1461 static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
1462 {
1463         u16 auth_types;
1464
1465         if (auth == NULL) {
1466                 wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
1467                            "received");
1468                 return -1;
1469         }
1470
1471         auth_types = WPA_GET_BE16(auth);
1472
1473         wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
1474                    auth_types);
1475         wps->auth_type = wps->wps->auth_types & auth_types;
1476         if (wps->auth_type == 0) {
1477                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1478                            "authentication types (own 0x%x Enrollee 0x%x)",
1479                            wps->wps->auth_types, auth_types);
1480                 return -1;
1481         }
1482
1483         return 0;
1484 }
1485
1486
1487 static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
1488 {
1489         u16 encr_types;
1490
1491         if (encr == NULL) {
1492                 wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
1493                            "received");
1494                 return -1;
1495         }
1496
1497         encr_types = WPA_GET_BE16(encr);
1498
1499         wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
1500                    encr_types);
1501         wps->encr_type = wps->wps->encr_types & encr_types;
1502         if (wps->encr_type == 0) {
1503                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1504                            "encryption types");
1505                 return -1;
1506         }
1507
1508         return 0;
1509 }
1510
1511
1512 static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
1513 {
1514         if (conn == NULL) {
1515                 wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
1516                            "received");
1517                 return -1;
1518         }
1519
1520         wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
1521                    *conn);
1522
1523         return 0;
1524 }
1525
1526
1527 static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
1528 {
1529         u16 m;
1530
1531         if (methods == NULL) {
1532                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
1533                 return -1;
1534         }
1535
1536         m = WPA_GET_BE16(methods);
1537
1538         wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
1539
1540         return 0;
1541 }
1542
1543
1544 static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
1545 {
1546         if (state == NULL) {
1547                 wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
1548                            "received");
1549                 return -1;
1550         }
1551
1552         wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
1553                    *state);
1554
1555         return 0;
1556 }
1557
1558
1559 static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
1560 {
1561         u16 a;
1562
1563         if (assoc == NULL) {
1564                 wpa_printf(MSG_DEBUG, "WPS: No Association State received");
1565                 return -1;
1566         }
1567
1568         a = WPA_GET_BE16(assoc);
1569         wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);
1570
1571         return 0;
1572 }
1573
1574
1575 static int wps_process_config_error(struct wps_data *wps, const u8 *err)
1576 {
1577         u16 e;
1578
1579         if (err == NULL) {
1580                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
1581                 return -1;
1582         }
1583
1584         e = WPA_GET_BE16(err);
1585         wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);
1586
1587         return 0;
1588 }
1589
1590
1591 static enum wps_process_res wps_process_m1(struct wps_data *wps,
1592                                            struct wps_parse_attr *attr)
1593 {
1594         wpa_printf(MSG_DEBUG, "WPS: Received M1");
1595
1596         if (wps->state != RECV_M1) {
1597                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1598                            "receiving M1", wps->state);
1599                 return WPS_FAILURE;
1600         }
1601
1602         if (wps_process_uuid_e(wps, attr->uuid_e) ||
1603             wps_process_mac_addr(wps, attr->mac_addr) ||
1604             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1605             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
1606             wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
1607             wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
1608             wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
1609             wps_process_config_methods(wps, attr->config_methods) ||
1610             wps_process_wps_state(wps, attr->wps_state) ||
1611             wps_process_device_attrs(&wps->peer_dev, attr) ||
1612             wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
1613             wps_process_assoc_state(wps, attr->assoc_state) ||
1614             wps_process_dev_password_id(wps, attr->dev_password_id) ||
1615             wps_process_config_error(wps, attr->config_error) ||
1616             wps_process_os_version(&wps->peer_dev, attr->os_version))
1617                 return WPS_FAILURE;
1618
1619         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
1620             wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
1621             wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
1622             wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
1623             (wps->dev_pw_id != DEV_PW_PUSHBUTTON || !wps->registrar->pbc)) {
1624                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
1625                            wps->dev_pw_id);
1626                 wps->state = SEND_M2D;
1627                 return WPS_CONTINUE;
1628         }
1629
1630         if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
1631                 if (wps_registrar_pbc_overlap(wps->registrar, wps->mac_addr_e,
1632                                               wps->uuid_e)) {
1633                         wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
1634                                    "negotiation");
1635                         wps->state = SEND_M2D;
1636                         return WPS_CONTINUE;
1637                 }
1638                 wps_registrar_add_pbc_session(wps->registrar, wps->mac_addr_e,
1639                                               wps->uuid_e);
1640                 wps->pbc = 1;
1641         }
1642
1643         wps->state = SEND_M2;
1644         return WPS_CONTINUE;
1645 }
1646
1647
1648 static enum wps_process_res wps_process_m3(struct wps_data *wps,
1649                                            const struct wpabuf *msg,
1650                                            struct wps_parse_attr *attr)
1651 {
1652         wpa_printf(MSG_DEBUG, "WPS: Received M3");
1653
1654         if (wps->state != RECV_M3) {
1655                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1656                            "receiving M3", wps->state);
1657                 wps->state = SEND_WSC_NACK;
1658                 return WPS_CONTINUE;
1659         }
1660
1661         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1662             wps_process_authenticator(wps, attr->authenticator, msg) ||
1663             wps_process_e_hash1(wps, attr->e_hash1) ||
1664             wps_process_e_hash2(wps, attr->e_hash2)) {
1665                 wps->state = SEND_WSC_NACK;
1666                 return WPS_CONTINUE;
1667         }
1668
1669         wps->state = SEND_M4;
1670         return WPS_CONTINUE;
1671 }
1672
1673
1674 static enum wps_process_res wps_process_m5(struct wps_data *wps,
1675                                            const struct wpabuf *msg,
1676                                            struct wps_parse_attr *attr)
1677 {
1678         struct wpabuf *decrypted;
1679         struct wps_parse_attr eattr;
1680
1681         wpa_printf(MSG_DEBUG, "WPS: Received M5");
1682
1683         if (wps->state != RECV_M5) {
1684                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1685                            "receiving M5", wps->state);
1686                 wps->state = SEND_WSC_NACK;
1687                 return WPS_CONTINUE;
1688         }
1689
1690         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1691             wps_process_authenticator(wps, attr->authenticator, msg)) {
1692                 wps->state = SEND_WSC_NACK;
1693                 return WPS_CONTINUE;
1694         }
1695
1696         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1697                                               attr->encr_settings_len);
1698         if (decrypted == NULL) {
1699                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1700                            "Settings attribute");
1701                 wps->state = SEND_WSC_NACK;
1702                 return WPS_CONTINUE;
1703         }
1704
1705         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1706                    "attribute");
1707         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1708             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1709             wps_process_e_snonce1(wps, eattr.e_snonce1)) {
1710                 wpabuf_free(decrypted);
1711                 wps->state = SEND_WSC_NACK;
1712                 return WPS_CONTINUE;
1713         }
1714         wpabuf_free(decrypted);
1715
1716         wps->state = SEND_M6;
1717         return WPS_CONTINUE;
1718 }
1719
1720
1721 static int wps_process_ap_settings_r(struct wps_data *wps,
1722                                      struct wps_parse_attr *attr)
1723 {
1724         if (wps->wps->ap)
1725                 return 0;
1726
1727         /* AP Settings Attributes in M7 when Enrollee is an AP */
1728         if (wps_process_ap_settings(attr, &wps->cred) < 0)
1729                 return -1;
1730
1731         wpa_printf(MSG_INFO, "WPS: Received old AP configuration from AP");
1732
1733         /*
1734          * TODO: Provide access to AP settings and allow changes before sending
1735          * out M8. For now, just copy the settings unchanged into M8.
1736          */
1737
1738         return 0;
1739 }
1740
1741
1742 static enum wps_process_res wps_process_m7(struct wps_data *wps,
1743                                            const struct wpabuf *msg,
1744                                            struct wps_parse_attr *attr)
1745 {
1746         struct wpabuf *decrypted;
1747         struct wps_parse_attr eattr;
1748
1749         wpa_printf(MSG_DEBUG, "WPS: Received M7");
1750
1751         if (wps->state != RECV_M7) {
1752                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1753                            "receiving M7", wps->state);
1754                 wps->state = SEND_WSC_NACK;
1755                 return WPS_CONTINUE;
1756         }
1757
1758         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1759             wps_process_authenticator(wps, attr->authenticator, msg)) {
1760                 wps->state = SEND_WSC_NACK;
1761                 return WPS_CONTINUE;
1762         }
1763
1764         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1765                                               attr->encr_settings_len);
1766         if (decrypted == NULL) {
1767                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1768                            "Settings attribute");
1769                 wps->state = SEND_WSC_NACK;
1770                 return WPS_CONTINUE;
1771         }
1772
1773         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1774                    "attribute");
1775         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1776             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1777             wps_process_e_snonce2(wps, eattr.e_snonce2) ||
1778             wps_process_ap_settings_r(wps, &eattr)) {
1779                 wpabuf_free(decrypted);
1780                 wps->state = SEND_WSC_NACK;
1781                 return WPS_CONTINUE;
1782         }
1783
1784         wpabuf_free(decrypted);
1785
1786         wps->state = SEND_M8;
1787         return WPS_CONTINUE;
1788 }
1789
1790
1791 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1792                                                 const struct wpabuf *msg)
1793 {
1794         struct wps_parse_attr attr;
1795         enum wps_process_res ret = WPS_CONTINUE;
1796
1797         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1798
1799         if (wps_parse_msg(msg, &attr) < 0)
1800                 return WPS_FAILURE;
1801
1802         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1803                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1804                            attr.version ? *attr.version : 0);
1805                 return WPS_FAILURE;
1806         }
1807
1808         if (attr.msg_type == NULL) {
1809                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1810                 return WPS_FAILURE;
1811         }
1812
1813         if (*attr.msg_type != WPS_M1 &&
1814             (attr.registrar_nonce == NULL ||
1815              os_memcmp(wps->nonce_r, attr.registrar_nonce,
1816                        WPS_NONCE_LEN != 0))) {
1817                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1818                 return WPS_FAILURE;
1819         }
1820
1821         switch (*attr.msg_type) {
1822         case WPS_M1:
1823                 ret = wps_process_m1(wps, &attr);
1824                 break;
1825         case WPS_M3:
1826                 ret = wps_process_m3(wps, msg, &attr);
1827                 break;
1828         case WPS_M5:
1829                 ret = wps_process_m5(wps, msg, &attr);
1830                 break;
1831         case WPS_M7:
1832                 ret = wps_process_m7(wps, msg, &attr);
1833                 break;
1834         default:
1835                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1836                            *attr.msg_type);
1837                 return WPS_FAILURE;
1838         }
1839
1840         if (ret == WPS_CONTINUE) {
1841                 /* Save a copy of the last message for Authenticator derivation
1842                  */
1843                 wpabuf_free(wps->last_msg);
1844                 wps->last_msg = wpabuf_dup(msg);
1845         }
1846
1847         return ret;
1848 }
1849
1850
1851 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1852                                                 const struct wpabuf *msg)
1853 {
1854         struct wps_parse_attr attr;
1855
1856         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1857
1858         if (wps_parse_msg(msg, &attr) < 0)
1859                 return WPS_FAILURE;
1860
1861         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1862                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1863                            attr.version ? *attr.version : 0);
1864                 return WPS_FAILURE;
1865         }
1866
1867         if (attr.msg_type == NULL) {
1868                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1869                 return WPS_FAILURE;
1870         }
1871
1872         if (*attr.msg_type != WPS_WSC_ACK) {
1873                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1874                            *attr.msg_type);
1875                 return WPS_FAILURE;
1876         }
1877
1878         if (attr.registrar_nonce == NULL ||
1879             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1880         {
1881                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1882                 return WPS_FAILURE;
1883         }
1884
1885         if (attr.enrollee_nonce == NULL ||
1886             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1887                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1888                 return WPS_FAILURE;
1889         }
1890
1891         if (wps->state == RECV_M2D_ACK) {
1892                 /* TODO: support for multiple registrars and sending of
1893                  * multiple M2/M2D messages */
1894
1895                 wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
1896                            "terminate negotiation");
1897         }
1898
1899         return WPS_FAILURE;
1900 }
1901
1902
1903 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1904                                                  const struct wpabuf *msg)
1905 {
1906         struct wps_parse_attr attr;
1907
1908         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1909
1910         wps->state = SEND_WSC_NACK;
1911
1912         if (wps_parse_msg(msg, &attr) < 0)
1913                 return WPS_FAILURE;
1914
1915         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1916                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1917                            attr.version ? *attr.version : 0);
1918                 return WPS_FAILURE;
1919         }
1920
1921         if (attr.msg_type == NULL) {
1922                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1923                 return WPS_FAILURE;
1924         }
1925
1926         if (*attr.msg_type != WPS_WSC_NACK) {
1927                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1928                            *attr.msg_type);
1929                 return WPS_FAILURE;
1930         }
1931
1932         if (attr.registrar_nonce == NULL ||
1933             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1934         {
1935                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1936                 return WPS_FAILURE;
1937         }
1938
1939         if (attr.enrollee_nonce == NULL ||
1940             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1941                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1942                 return WPS_FAILURE;
1943         }
1944
1945         if (attr.config_error == NULL) {
1946                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1947                            "in WSC_NACK");
1948                 return WPS_FAILURE;
1949         }
1950
1951         wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
1952                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1953
1954         return WPS_FAILURE;
1955 }
1956
1957
1958 static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
1959                                                  const struct wpabuf *msg)
1960 {
1961         struct wps_parse_attr attr;
1962
1963         wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");
1964
1965         if (wps->state != RECV_DONE) {
1966                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1967                            "receiving WSC_Done", wps->state);
1968                 return WPS_FAILURE;
1969         }
1970
1971         if (wps_parse_msg(msg, &attr) < 0)
1972                 return WPS_FAILURE;
1973
1974         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1975                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1976                            attr.version ? *attr.version : 0);
1977                 return WPS_FAILURE;
1978         }
1979
1980         if (attr.msg_type == NULL) {
1981                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1982                 return WPS_FAILURE;
1983         }
1984
1985         if (*attr.msg_type != WPS_WSC_DONE) {
1986                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1987                            *attr.msg_type);
1988                 return WPS_FAILURE;
1989         }
1990
1991         if (attr.registrar_nonce == NULL ||
1992             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1993         {
1994                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1995                 return WPS_FAILURE;
1996         }
1997
1998         if (attr.enrollee_nonce == NULL ||
1999             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2000                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2001                 return WPS_FAILURE;
2002         }
2003
2004         wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
2005
2006         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
2007             wps->wps->ap) {
2008                 struct wps_credential cred;
2009
2010                 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
2011                            "on first Enrollee connection");
2012
2013                 os_memset(&cred, 0, sizeof(cred));
2014                 os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
2015                 cred.ssid_len = wps->wps->ssid_len;
2016                 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
2017                 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
2018                 os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
2019                 cred.key_len = wps->new_psk_len;
2020
2021                 wps->wps->wps_state = WPS_STATE_CONFIGURED;
2022                 wpa_hexdump_ascii_key(MSG_DEBUG,
2023                                       "WPS: Generated random passphrase",
2024                                       wps->new_psk, wps->new_psk_len);
2025                 if (wps->wps->cred_cb)
2026                         wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
2027
2028                 os_free(wps->new_psk);
2029                 wps->new_psk = NULL;
2030         }
2031
2032         if (!wps->wps->ap) {
2033                 wpa_printf(MSG_DEBUG, "WPS: Update local configuration based "
2034                            "on the modified AP configuration");
2035                 if (wps->wps->cred_cb)
2036                         wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
2037         }
2038
2039         if (wps->new_psk) {
2040                 if (wps_cb_new_psk(wps->registrar, wps->mac_addr_e,
2041                                    wps->new_psk, wps->new_psk_len)) {
2042                         wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
2043                                    "new PSK");
2044                 }
2045                 os_free(wps->new_psk);
2046                 wps->new_psk = NULL;
2047         }
2048
2049         if (wps->pbc) {
2050                 wps_registrar_remove_pbc_session(wps->registrar,
2051                                                  wps->mac_addr_e, wps->uuid_e);
2052                 wps_registrar_pbc_completed(wps->registrar);
2053         }
2054
2055         return WPS_DONE;
2056 }
2057
2058
2059 enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
2060                                                u8 op_code,
2061                                                const struct wpabuf *msg)
2062 {
2063
2064         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
2065                    "op_code=%d)",
2066                    (unsigned long) wpabuf_len(msg), op_code);
2067
2068         switch (op_code) {
2069         case WSC_MSG:
2070                 return wps_process_wsc_msg(wps, msg);
2071         case WSC_ACK:
2072                 return wps_process_wsc_ack(wps, msg);
2073         case WSC_NACK:
2074                 return wps_process_wsc_nack(wps, msg);
2075         case WSC_Done:
2076                 return wps_process_wsc_done(wps, msg);
2077         default:
2078                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
2079                 return WPS_FAILURE;
2080         }
2081 }