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         u8 *pin;
  30         size_t pin_len;
  31         int locked;
  32 };
  33
  34
  35 static void wps_free_pin(struct wps_uuid_pin *pin)
  36 {
  37         os_free(pin->pin);
  38         os_free(pin);
  39 }
  40
  41
  42 static void wps_free_pins(struct wps_uuid_pin *pins)
  43 {
  44         struct wps_uuid_pin *pin, *prev;
  45
  46         pin = pins;
  47         while (pin) {
  48                 prev = pin;
  49                 pin = pin->next;
  50                 wps_free_pin(prev);
  51         }
  52 }
  53
  54
  55 struct wps_pbc_session {
  56         struct wps_pbc_session *next;
  57         u8 addr[ETH_ALEN];
  58         u8 uuid_e[WPS_UUID_LEN];
  59         struct os_time timestamp;
  60 };
  61
  62
  63 static void wps_free_pbc_sessions(struct wps_pbc_session *pbc)
  64 {
  65         struct wps_pbc_session *prev;
  66
  67         while (pbc) {
  68                 prev = pbc;
  69                 pbc = pbc->next;
  70                 os_free(prev);
  71         }
  72 }
  73
  74
  75 struct wps_registrar {
  76         struct wps_context *wps;
  77
  78         int pbc;
  79         int selected_registrar;
  80
  81         int (*new_psk_cb)(void *ctx, const u8 *mac_addr, const u8 *psk,
  82                           size_t psk_len);
  83         int (*set_ie_cb)(void *ctx, const u8 *beacon_ie, size_t beacon_ie_len,
  84                          const u8 *probe_resp_ie, size_t probe_resp_ie_len);
  85         void (*pin_needed_cb)(void *ctx, const u8 *uuid_e,
  86                               const struct wps_device_data *dev);
  87         void *cb_ctx;
  88
  89         struct wps_uuid_pin *pins;
  90         struct wps_pbc_session *pbc_sessions;
  91 };
  92
  93
  94 static int wps_set_ie(struct wps_registrar *reg);
  95 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx);
  96
  97
  98 static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
  99                                           const u8 *addr, const u8 *uuid_e)
 100 {
 101         struct wps_pbc_session *pbc, *prev = NULL;
 102         struct os_time now;
 103
 104         os_get_time(&now);
 105
 106         pbc = reg->pbc_sessions;
 107         while (pbc) {
 108                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 109                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 110                         if (prev)
 111                                 prev->next = pbc->next;
 112                         else
 113                                 reg->pbc_sessions = pbc->next;
 114                         break;
 115                 }
 116                 prev = pbc;
 117                 pbc = pbc->next;
 118         }
 119
 120         if (!pbc) {
 121                 pbc = os_zalloc(sizeof(*pbc));
 122                 if (pbc == NULL)
 123                         return;
 124                 os_memcpy(pbc->addr, addr, ETH_ALEN);
 125                 if (uuid_e)
 126                         os_memcpy(pbc->uuid_e, uuid_e, WPS_UUID_LEN);
 127         }
 128
 129         pbc->next = reg->pbc_sessions;
 130         reg->pbc_sessions = pbc;
 131         pbc->timestamp = now;
 132
 133         /* remove entries that have timed out */
 134         prev = pbc;
 135         pbc = pbc->next;
 136
 137         while (pbc) {
 138                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME) {
 139                         prev->next = NULL;
 140                         wps_free_pbc_sessions(pbc);
 141                         break;
 142                 }
 143                 prev = pbc;
 144                 pbc = pbc->next;
 145         }
 146 }
 147
 148
 149 static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
 150                                              const u8 *addr, const u8 *uuid_e)
 151 {
 152         struct wps_pbc_session *pbc, *prev = NULL;
 153
 154         pbc = reg->pbc_sessions;
 155         while (pbc) {
 156                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 157                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 158                         if (prev)
 159                                 prev->next = pbc->next;
 160                         else
 161                                 reg->pbc_sessions = pbc->next;
 162                         os_free(pbc);
 163                         break;
 164                 }
 165                 prev = pbc;
 166                 pbc = pbc->next;
 167         }
 168 }
 169
 170
 171 int wps_registrar_pbc_overlap(struct wps_registrar *reg,
 172                               const u8 *addr, const u8 *uuid_e)
 173 {
 174         int count = 0;
 175         struct wps_pbc_session *pbc;
 176         struct os_time now;
 177
 178         os_get_time(&now);
 179
 180         for (pbc = reg->pbc_sessions; pbc; pbc = pbc->next) {
 181                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME)
 182                         break;
 183                 if (addr == NULL || os_memcmp(addr, pbc->addr, ETH_ALEN) ||
 184                     uuid_e == NULL ||
 185                     os_memcmp(uuid_e, pbc->uuid_e, WPS_UUID_LEN))
 186                         count++;
 187         }
 188
 189         if (addr || uuid_e)
 190                 count++;
 191
 192         return count > 1 ? 1 : 0;
 193 }
 194
 195
 196 static int wps_build_wps_state(struct wps_context *wps, struct wpabuf *msg)
 197 {
 198         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
 199                    wps->wps_state);
 200         wpabuf_put_be16(msg, ATTR_WPS_STATE);
 201         wpabuf_put_be16(msg, 1);
 202         wpabuf_put_u8(msg, wps->wps_state);
 203         return 0;
 204 }
 205
 206
 207 static int wps_build_ap_setup_locked(struct wps_context *wps,
 208                                      struct wpabuf *msg)
 209 {
 210         if (wps->ap_setup_locked) {
 211                 wpa_printf(MSG_DEBUG, "WPS:  * AP Setup Locked");
 212                 wpabuf_put_be16(msg, ATTR_AP_SETUP_LOCKED);
 213                 wpabuf_put_be16(msg, 1);
 214                 wpabuf_put_u8(msg, 1);
 215         }
 216         return 0;
 217 }
 218
 219
 220 static int wps_build_selected_registrar(struct wps_registrar *reg,
 221                                         struct wpabuf *msg)
 222 {
 223         if (!reg->selected_registrar)
 224                 return 0;
 225         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar");
 226         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR);
 227         wpabuf_put_be16(msg, 1);
 228         wpabuf_put_u8(msg, 1);
 229         return 0;
 230 }
 231
 232
 233 static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
 234                                              struct wpabuf *msg)
 235 {
 236         u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
 237         if (!reg->selected_registrar)
 238                 return 0;
 239         wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
 240         wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
 241         wpabuf_put_be16(msg, 2);
 242         wpabuf_put_be16(msg, id);
 243         return 0;
 244 }
 245
 246
 247 static int wps_build_sel_reg_config_methods(struct wps_registrar *reg,
 248                                             struct wpabuf *msg)
 249 {
 250         u16 methods;
 251         if (!reg->selected_registrar)
 252                 return 0;
 253         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 254         if (reg->pbc)
 255                 methods |= WPS_CONFIG_PUSHBUTTON;
 256         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar Config Methods (%x)",
 257                    methods);
 258         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR_CONFIG_METHODS);
 259         wpabuf_put_be16(msg, 2);
 260         wpabuf_put_be16(msg, methods);
 261         return 0;
 262 }
 263
 264
 265 static int wps_build_probe_config_methods(struct wps_registrar *reg,
 266                                           struct wpabuf *msg)
 267 {
 268         u16 methods;
 269         methods = 0;
 270         wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
 271         wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
 272         wpabuf_put_be16(msg, 2);
 273         wpabuf_put_be16(msg, methods);
 274         return 0;
 275 }
 276
 277
 278 static int wps_build_config_methods_r(struct wps_registrar *reg,
 279                                       struct wpabuf *msg)
 280 {
 281         u16 methods;
 282         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 283         if (reg->pbc)
 284                 methods |= WPS_CONFIG_PUSHBUTTON;
 285         return wps_build_config_methods(msg, methods);
 286 }
 287
 288
 289 static int wps_build_resp_type(struct wps_registrar *reg, struct wpabuf *msg)
 290 {
 291         u8 resp = reg->wps->ap ? WPS_RESP_AP : WPS_RESP_REGISTRAR;
 292         wpa_printf(MSG_DEBUG, "WPS:  * Response Type (%d)", resp);
 293         wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
 294         wpabuf_put_be16(msg, 1);
 295         wpabuf_put_u8(msg, resp);
 296         return 0;
 297 }
 298
 299
 300 struct wps_registrar *
 301 wps_registrar_init(struct wps_context *wps,
 302                    const struct wps_registrar_config *cfg)
 303 {
 304         struct wps_registrar *reg = os_zalloc(sizeof(*reg));
 305         if (reg == NULL)
 306                 return NULL;
 307
 308         reg->wps = wps;
 309         reg->new_psk_cb = cfg->new_psk_cb;
 310         reg->set_ie_cb = cfg->set_ie_cb;
 311         reg->pin_needed_cb = cfg->pin_needed_cb;
 312         reg->cb_ctx = cfg->cb_ctx;
 313
 314         if (wps_set_ie(reg)) {
 315                 wps_registrar_deinit(reg);
 316                 return NULL;
 317         }
 318
 319         return reg;
 320 }
 321
 322
 323 void wps_registrar_deinit(struct wps_registrar *reg)
 324 {
 325         if (reg == NULL)
 326                 return;
 327         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 328         wps_free_pins(reg->pins);
 329         wps_free_pbc_sessions(reg->pbc_sessions);
 330         os_free(reg);
 331 }
 332
 333
 334 int wps_registrar_add_pin(struct wps_registrar *reg, const u8 *uuid,
 335                           const u8 *pin, size_t pin_len)
 336 {
 337         struct wps_uuid_pin *p;
 338
 339         p = os_zalloc(sizeof(*p));
 340         if (p == NULL)
 341                 return -1;
 342         os_memcpy(p->uuid, uuid, WPS_UUID_LEN);
 343         p->pin = os_malloc(pin_len);
 344         if (p->pin == NULL) {
 345                 os_free(p);
 346                 return -1;
 347         }
 348         os_memcpy(p->pin, pin, pin_len);
 349         p->pin_len = pin_len;
 350
 351         p->next = reg->pins;
 352         reg->pins = p;
 353
 354         wpa_printf(MSG_DEBUG, "WPS: A new PIN configured");
 355         wpa_hexdump(MSG_DEBUG, "WPS: UUID", uuid, WPS_UUID_LEN);
 356         wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: PIN", pin, pin_len);
 357         reg->selected_registrar = 1;
 358         reg->pbc = 0;
 359         wps_set_ie(reg);
 360
 361         return 0;
 362 }
 363
 364
 365 int wps_registrar_invalidate_pin(struct wps_registrar *reg, const u8 *uuid)
 366 {
 367         struct wps_uuid_pin *pin, *prev;
 368
 369         prev = NULL;
 370         pin = reg->pins;
 371         while (pin) {
 372                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 373                         if (prev == NULL)
 374                                 reg->pins = pin->next;
 375                         else
 376                                 prev->next = pin->next;
 377                         wpa_hexdump(MSG_DEBUG, "WPS: Invalidated PIN for UUID",
 378                                     pin->uuid, WPS_UUID_LEN);
 379                         wps_free_pin(pin);
 380                         return 0;
 381                 }
 382                 prev = pin;
 383                 pin = pin->next;
 384         }
 385
 386         return -1;
 387 }
 388
 389
 390 static const u8 * wps_registrar_get_pin(struct wps_registrar *reg,
 391                                         const u8 *uuid, size_t *pin_len)
 392 {
 393         struct wps_uuid_pin *pin;
 394
 395         pin = reg->pins;
 396         while (pin) {
 397                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 398                         /*
 399                          * Lock the PIN to avoid attacks based on concurrent
 400                          * re-use of the PIN that could otherwise avoid PIN
 401                          * invalidations.
 402                          */
 403                         if (pin->locked) {
 404                                 wpa_printf(MSG_DEBUG, "WPS: Selected PIN "
 405                                            "locked - do not allow concurrent "
 406                                            "re-use");
 407                                 return NULL;
 408                         }
 409                         *pin_len = pin->pin_len;
 410                         pin->locked = 1;
 411                         return pin->pin;
 412                 }
 413                 pin = pin->next;
 414         }
 415
 416         return NULL;
 417 }
 418
 419
 420 int wps_registrar_unlock_pin(struct wps_registrar *reg, const u8 *uuid)
 421 {
 422         struct wps_uuid_pin *pin;
 423
 424         pin = reg->pins;
 425         while (pin) {
 426                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 427                         pin->locked = 0;
 428                         return 0;
 429                 }
 430                 pin = pin->next;
 431         }
 432
 433         return -1;
 434 }
 435
 436
 437 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx)
 438 {
 439         struct wps_registrar *reg = eloop_ctx;
 440
 441         wpa_printf(MSG_DEBUG, "WPS: PBC timed out - disable PBC mode");
 442         reg->selected_registrar = 0;
 443         reg->pbc = 0;
 444         wps_set_ie(reg);
 445 }
 446
 447
 448 int wps_registrar_button_pushed(struct wps_registrar *reg)
 449 {
 450         if (wps_registrar_pbc_overlap(reg, NULL, NULL)) {
 451                 wpa_printf(MSG_DEBUG, "WPS: PBC overlap - do not start PBC "
 452                            "mode");
 453                 return -1;
 454         }
 455         wpa_printf(MSG_DEBUG, "WPS: Button pushed - PBC mode started");
 456         reg->selected_registrar = 1;
 457         reg->pbc = 1;
 458         wps_set_ie(reg);
 459
 460         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 461         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wps_registrar_pbc_timeout,
 462                                reg, NULL);
 463         return 0;
 464 }
 465
 466
 467 static void wps_registrar_pbc_completed(struct wps_registrar *reg)
 468 {
 469         wpa_printf(MSG_DEBUG, "WPS: PBC completed - stopping PBC mode");
 470         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 471         reg->selected_registrar = 0;
 472         reg->pbc = 0;
 473         wps_set_ie(reg);
 474 }
 475
 476
 477 void wps_registrar_probe_req_rx(struct wps_registrar *reg, const u8 *addr,
 478                                 const struct wpabuf *wps_data)
 479 {
 480         struct wps_parse_attr attr;
 481         u16 methods;
 482
 483         wpa_hexdump_buf(MSG_MSGDUMP,
 484                         "WPS: Probe Request with WPS data received",
 485                         wps_data);
 486
 487         if (wps_parse_msg(wps_data, &attr) < 0 ||
 488             attr.version == NULL || *attr.version != WPS_VERSION) {
 489                 wpa_printf(MSG_DEBUG, "WPS: Unsupported ProbeReq WPS IE "
 490                            "version 0x%x", attr.version ? *attr.version : 0);
 491                 return;
 492         }
 493
 494         if (attr.config_methods == NULL) {
 495                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods attribute in "
 496                            "Probe Request");
 497                 return;
 498         }
 499
 500         methods = WPA_GET_BE16(attr.config_methods);
 501         if (!(methods & WPS_CONFIG_PUSHBUTTON))
 502                 return; /* Not PBC */
 503
 504         wpa_printf(MSG_DEBUG, "WPS: Probe Request for PBC received from "
 505                    MACSTR, MAC2STR(addr));
 506
 507         wps_registrar_add_pbc_session(reg, addr, attr.uuid_e);
 508 }
 509
 510
 511 static int wps_cb_new_psk(struct wps_registrar *reg, const u8 *mac_addr,
 512                           const u8 *psk, size_t psk_len)
 513 {
 514         if (reg->new_psk_cb == NULL)
 515                 return 0;
 516
 517         return reg->new_psk_cb(reg->cb_ctx, mac_addr, psk, psk_len);
 518 }
 519
 520
 521 static void wps_cb_pin_needed(struct wps_registrar *reg, const u8 *uuid_e,
 522                               const struct wps_device_data *dev)
 523 {
 524         if (reg->pin_needed_cb == NULL)
 525                 return;
 526
 527         reg->pin_needed_cb(reg->cb_ctx, uuid_e, dev);
 528 }
 529
 530
 531 static int wps_cb_set_ie(struct wps_registrar *reg,
 532                          const struct wpabuf *beacon_ie,
 533                          const struct wpabuf *probe_resp_ie)
 534 {
 535         if (reg->set_ie_cb == NULL)
 536                 return 0;
 537
 538         return reg->set_ie_cb(reg->cb_ctx, wpabuf_head(beacon_ie),
 539                               wpabuf_len(beacon_ie),
 540                               wpabuf_head(probe_resp_ie),
 541                               wpabuf_len(probe_resp_ie));
 542 }
 543
 544
 545 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
 546 static struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
 547 {
 548         struct wpabuf *ie;
 549         const u8 *pos, *end;
 550
 551         ie = wpabuf_alloc(wpabuf_len(data) + 100);
 552         if (ie == NULL) {
 553                 wpabuf_free(data);
 554                 return NULL;
 555         }
 556
 557         pos = wpabuf_head(data);
 558         end = pos + wpabuf_len(data);
 559
 560         while (end > pos) {
 561                 size_t frag_len = end - pos;
 562                 if (frag_len > 251)
 563                         frag_len = 251;
 564                 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 565                 wpabuf_put_u8(ie, 4 + frag_len);
 566                 wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 567                 wpabuf_put_data(ie, pos, frag_len);
 568                 pos += frag_len;
 569         }
 570
 571         wpabuf_free(data);
 572
 573         return ie;
 574 }
 575
 576
 577 static int wps_set_ie(struct wps_registrar *reg)
 578 {
 579         struct wpabuf *beacon;
 580         struct wpabuf *probe;
 581         int ret;
 582
 583         wpa_printf(MSG_DEBUG, "WPS: Build Beacon and Probe Response IEs");
 584
 585         beacon = wpabuf_alloc(300);
 586         if (beacon == NULL)
 587                 return -1;
 588         probe = wpabuf_alloc(400);
 589         if (probe == NULL) {
 590                 wpabuf_free(beacon);
 591                 return -1;
 592         }
 593
 594         if (wps_build_version(beacon) ||
 595             wps_build_wps_state(reg->wps, beacon) ||
 596             wps_build_ap_setup_locked(reg->wps, beacon) ||
 597             wps_build_selected_registrar(reg, beacon) ||
 598             wps_build_sel_reg_dev_password_id(reg, beacon) ||
 599             wps_build_sel_reg_config_methods(reg, beacon) ||
 600             wps_build_version(probe) ||
 601             wps_build_wps_state(reg->wps, probe) ||
 602             wps_build_ap_setup_locked(reg->wps, probe) ||
 603             wps_build_selected_registrar(reg, probe) ||
 604             wps_build_sel_reg_dev_password_id(reg, probe) ||
 605             wps_build_sel_reg_config_methods(reg, probe) ||
 606             wps_build_resp_type(reg, probe) ||
 607             wps_build_uuid_e(probe, reg->wps->uuid) ||
 608             wps_build_device_attrs(&reg->wps->dev, probe) ||
 609             wps_build_probe_config_methods(reg, probe) ||
 610             wps_build_rf_bands(&reg->wps->dev, probe)) {
 611                 wpabuf_free(beacon);
 612                 wpabuf_free(probe);
 613                 return -1;
 614         }
 615
 616         beacon = wps_ie_encapsulate(beacon);
 617         probe = wps_ie_encapsulate(probe);
 618
 619         if (!beacon || !probe) {
 620                 wpabuf_free(beacon);
 621                 wpabuf_free(probe);
 622                 return -1;
 623         }
 624
 625         ret = wps_cb_set_ie(reg, beacon, probe);
 626         wpabuf_free(beacon);
 627         wpabuf_free(probe);
 628
 629         return ret;
 630 }
 631
 632
 633 static int wps_get_dev_password(struct wps_data *wps)
 634 {
 635         const u8 *pin;
 636         size_t pin_len;
 637
 638         os_free(wps->dev_password);
 639         wps->dev_password = NULL;
 640
 641         if (wps->pbc) {
 642                 wpa_printf(MSG_DEBUG, "WPS: Use default PIN for PBC");
 643                 pin = (const u8 *) "00000000";
 644                 pin_len = 8;
 645         } else {
 646                 pin = wps_registrar_get_pin(wps->registrar, wps->uuid_e,
 647                                             &pin_len);
 648         }
 649         if (pin == NULL) {
 650                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available for "
 651                            "the Enrollee");
 652                 wps_cb_pin_needed(wps->registrar, wps->uuid_e, &wps->peer_dev);
 653                 return -1;
 654         }
 655
 656         wps->dev_password = os_malloc(pin_len);
 657         if (wps->dev_password == NULL)
 658                 return -1;
 659         os_memcpy(wps->dev_password, pin, pin_len);
 660         wps->dev_password_len = pin_len;
 661
 662         return 0;
 663 }
 664
 665
 666 static int wps_build_uuid_r(struct wps_data *wps, struct wpabuf *msg)
 667 {
 668         wpa_printf(MSG_DEBUG, "WPS:  * UUID-R");
 669         wpabuf_put_be16(msg, ATTR_UUID_R);
 670         wpabuf_put_be16(msg, WPS_UUID_LEN);
 671         wpabuf_put_data(msg, wps->uuid_r, WPS_UUID_LEN);
 672         return 0;
 673 }
 674
 675
 676 static int wps_build_r_hash(struct wps_data *wps, struct wpabuf *msg)
 677 {
 678         u8 *hash;
 679         const u8 *addr[4];
 680         size_t len[4];
 681
 682         if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
 683                 return -1;
 684         wpa_hexdump(MSG_DEBUG, "WPS: R-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
 685         wpa_hexdump(MSG_DEBUG, "WPS: R-S2",
 686                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
 687
 688         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
 689                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
 690                            "R-Hash derivation");
 691                 return -1;
 692         }
 693
 694         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash1");
 695         wpabuf_put_be16(msg, ATTR_R_HASH1);
 696         wpabuf_put_be16(msg, SHA256_MAC_LEN);
 697         hash = wpabuf_put(msg, SHA256_MAC_LEN);
 698         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 699         addr[0] = wps->snonce;
 700         len[0] = WPS_SECRET_NONCE_LEN;
 701         addr[1] = wps->psk1;
 702         len[1] = WPS_PSK_LEN;
 703         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 704         len[2] = wpabuf_len(wps->dh_pubkey_e);
 705         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 706         len[3] = wpabuf_len(wps->dh_pubkey_r);
 707         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 708         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", hash, SHA256_MAC_LEN);
 709
 710         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash2");
 711         wpabuf_put_be16(msg, ATTR_R_HASH2);
 712         wpabuf_put_be16(msg, SHA256_MAC_LEN);
 713         hash = wpabuf_put(msg, SHA256_MAC_LEN);
 714         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 715         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
 716         addr[1] = wps->psk2;
 717         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 718         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", hash, SHA256_MAC_LEN);
 719
 720         return 0;
 721 }
 722
 723
 724 static int wps_build_r_snonce1(struct wps_data *wps, struct wpabuf *msg)
 725 {
 726         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce1");
 727         wpabuf_put_be16(msg, ATTR_R_SNONCE1);
 728         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 729         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
 730         return 0;
 731 }
 732
 733
 734 static int wps_build_r_snonce2(struct wps_data *wps, struct wpabuf *msg)
 735 {
 736         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce2");
 737         wpabuf_put_be16(msg, ATTR_R_SNONCE2);
 738         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 739         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
 740                         WPS_SECRET_NONCE_LEN);
 741         return 0;
 742 }
 743
 744
 745 static int wps_build_cred_network_idx(struct wpabuf *msg,
 746                                       struct wps_credential *cred)
 747 {
 748         wpa_printf(MSG_DEBUG, "WPS:  * Network Index");
 749         wpabuf_put_be16(msg, ATTR_NETWORK_INDEX);
 750         wpabuf_put_be16(msg, 1);
 751         wpabuf_put_u8(msg, 0);
 752         return 0;
 753 }
 754
 755
 756 static int wps_build_cred_ssid(struct wpabuf *msg,
 757                                struct wps_credential *cred)
 758 {
 759         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 760         wpabuf_put_be16(msg, ATTR_SSID);
 761         wpabuf_put_be16(msg, cred->ssid_len);
 762         wpabuf_put_data(msg, cred->ssid, cred->ssid_len);
 763         return 0;
 764 }
 765
 766
 767 static int wps_build_cred_auth_type(struct wpabuf *msg,
 768                                     struct wps_credential *cred)
 769 {
 770         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)",
 771                    cred->auth_type);
 772         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 773         wpabuf_put_be16(msg, 2);
 774         wpabuf_put_be16(msg, cred->auth_type);
 775         return 0;
 776 }
 777
 778
 779 static int wps_build_cred_encr_type(struct wpabuf *msg,
 780                                     struct wps_credential *cred)
 781 {
 782         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)",
 783                    cred->encr_type);
 784         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 785         wpabuf_put_be16(msg, 2);
 786         wpabuf_put_be16(msg, cred->encr_type);
 787         return 0;
 788 }
 789
 790
 791 static int wps_build_cred_network_key(struct wpabuf *msg,
 792                                       struct wps_credential *cred)
 793 {
 794         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 795         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 796         wpabuf_put_be16(msg, cred->key_len);
 797         wpabuf_put_data(msg, cred->key, cred->key_len);
 798         return 0;
 799 }
 800
 801
 802 static int wps_build_cred_mac_addr(struct wpabuf *msg,
 803                                    struct wps_credential *cred)
 804 {
 805         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address");
 806         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 807         wpabuf_put_be16(msg, ETH_ALEN);
 808         wpabuf_put_data(msg, cred->mac_addr, ETH_ALEN);
 809         return 0;
 810 }
 811
 812
 813 static int wps_build_credential(struct wpabuf *msg,
 814                                 struct wps_credential *cred)
 815 {
 816         if (wps_build_cred_network_idx(msg, cred) ||
 817             wps_build_cred_ssid(msg, cred) ||
 818             wps_build_cred_auth_type(msg, cred) ||
 819             wps_build_cred_encr_type(msg, cred) ||
 820             wps_build_cred_network_key(msg, cred) ||
 821             wps_build_cred_mac_addr(msg, cred))
 822                 return -1;
 823         return 0;
 824 }
 825
 826
 827 static int wps_build_cred(struct wps_data *wps, struct wpabuf *msg)
 828 {
 829         struct wpabuf *cred;
 830
 831         wpa_printf(MSG_DEBUG, "WPS:  * Credential");
 832         os_memset(&wps->cred, 0, sizeof(wps->cred));
 833
 834         os_memcpy(wps->cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
 835         wps->cred.ssid_len = wps->wps->ssid_len;
 836
 837         /* Select the best authentication and encryption type */
 838         if (wps->auth_type & WPS_AUTH_WPA2PSK)
 839                 wps->auth_type = WPS_AUTH_WPA2PSK;
 840         else if (wps->auth_type & WPS_AUTH_WPAPSK)
 841                 wps->auth_type = WPS_AUTH_WPAPSK;
 842         else if (wps->auth_type & WPS_AUTH_OPEN)
 843                 wps->auth_type = WPS_AUTH_OPEN;
 844         else if (wps->auth_type & WPS_AUTH_SHARED)
 845                 wps->auth_type = WPS_AUTH_SHARED;
 846         else {
 847                 wpa_printf(MSG_DEBUG, "WPS: Unsupported auth_type 0x%x",
 848                            wps->auth_type);
 849                 return -1;
 850         }
 851         wps->cred.auth_type = wps->auth_type;
 852
 853         if (wps->auth_type == WPS_AUTH_WPA2PSK ||
 854             wps->auth_type == WPS_AUTH_WPAPSK) {
 855                 if (wps->encr_type & WPS_ENCR_AES)
 856                         wps->encr_type = WPS_ENCR_AES;
 857                 else if (wps->encr_type & WPS_ENCR_TKIP)
 858                         wps->encr_type = WPS_ENCR_TKIP;
 859                 else {
 860                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
 861                                    "type for WPA/WPA2");
 862                         return -1;
 863                 }
 864         } else {
 865                 if (wps->encr_type & WPS_ENCR_WEP)
 866                         wps->encr_type = WPS_ENCR_WEP;
 867                 else if (wps->encr_type & WPS_ENCR_NONE)
 868                         wps->encr_type = WPS_ENCR_NONE;
 869                 else {
 870                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
 871                                    "type for non-WPA/WPA2 mode");
 872                         return -1;
 873                 }
 874         }
 875         wps->cred.encr_type = wps->encr_type;
 876         os_memcpy(wps->cred.mac_addr, wps->mac_addr_e, ETH_ALEN);
 877
 878         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->wps->ap) {
 879                 u8 r[16];
 880                 /* Generate a random passphrase */
 881                 if (os_get_random(r, sizeof(r)) < 0)
 882                         return -1;
 883                 os_free(wps->new_psk);
 884                 wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
 885                 if (wps->new_psk == NULL)
 886                         return -1;
 887                 wps->new_psk_len--; /* remove newline */
 888                 while (wps->new_psk_len &&
 889                        wps->new_psk[wps->new_psk_len - 1] == '=')
 890                         wps->new_psk_len--;
 891                 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Generated passphrase",
 892                                       wps->new_psk, wps->new_psk_len);
 893                 os_memcpy(wps->cred.key, wps->new_psk, wps->new_psk_len);
 894                 wps->cred.key_len = wps->new_psk_len;
 895         } else if (wps->wps->network_key) {
 896                 os_memcpy(wps->cred.key, wps->wps->network_key,
 897                           wps->wps->network_key_len);
 898                 wps->cred.key_len = wps->wps->network_key_len;
 899         } else if (wps->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
 900                 char hex[65];
 901                 /* Generate a random per-device PSK */
 902                 os_free(wps->new_psk);
 903                 wps->new_psk_len = 32;
 904                 wps->new_psk = os_malloc(wps->new_psk_len);
 905                 if (wps->new_psk == NULL)
 906                         return -1;
 907                 if (os_get_random(wps->new_psk, wps->new_psk_len) < 0) {
 908                         os_free(wps->new_psk);
 909                         wps->new_psk = NULL;
 910                         return -1;
 911                 }
 912                 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
 913                                 wps->new_psk, wps->new_psk_len);
 914                 wpa_snprintf_hex(hex, sizeof(hex), wps->new_psk,
 915                                  wps->new_psk_len);
 916                 os_memcpy(wps->cred.key, hex, wps->new_psk_len * 2);
 917                 wps->cred.key_len = wps->new_psk_len * 2;
 918         }
 919
 920         cred = wpabuf_alloc(200);
 921         if (cred == NULL)
 922                 return -1;
 923
 924         if (wps_build_credential(cred, &wps->cred)) {
 925                 wpabuf_free(cred);
 926                 return -1;
 927         }
 928
 929         wpabuf_put_be16(msg, ATTR_CRED);
 930         wpabuf_put_be16(msg, wpabuf_len(cred));
 931         wpabuf_put_buf(msg, cred);
 932         wpabuf_free(cred);
 933
 934         return 0;
 935 }
 936
 937
 938 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *msg)
 939 {
 940         wpa_printf(MSG_DEBUG, "WPS:  * AP Settings");
 941
 942         if (wps_build_credential(msg, &wps->cred))
 943                 return -1;
 944
 945         return 0;
 946 }
 947
 948
 949 static struct wpabuf * wps_build_m2(struct wps_data *wps)
 950 {
 951         struct wpabuf *msg;
 952
 953         if (os_get_random(wps->nonce_r, WPS_NONCE_LEN) < 0)
 954                 return NULL;
 955         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 956                     wps->nonce_r, WPS_NONCE_LEN);
 957         os_memcpy(wps->uuid_r, wps->wps->uuid, WPS_UUID_LEN);
 958         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 959
 960         wpa_printf(MSG_DEBUG, "WPS: Building Message M2");
 961         msg = wpabuf_alloc(1000);
 962         if (msg == NULL)
 963                 return NULL;
 964
 965         if (wps_build_version(msg) ||
 966             wps_build_msg_type(msg, WPS_M2) ||
 967             wps_build_enrollee_nonce(wps, msg) ||
 968             wps_build_registrar_nonce(wps, msg) ||
 969             wps_build_uuid_r(wps, msg) ||
 970             wps_build_public_key(wps, msg) ||
 971             wps_derive_keys(wps) ||
 972             wps_build_auth_type_flags(wps, msg) ||
 973             wps_build_encr_type_flags(wps, msg) ||
 974             wps_build_conn_type_flags(wps, msg) ||
 975             wps_build_config_methods_r(wps->registrar, msg) ||
 976             wps_build_device_attrs(&wps->wps->dev, msg) ||
 977             wps_build_rf_bands(&wps->wps->dev, msg) ||
 978             wps_build_assoc_state(wps, msg) ||
 979             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 980             wps_build_dev_password_id(msg, DEV_PW_DEFAULT) ||
 981             wps_build_os_version(&wps->wps->dev, msg) ||
 982             wps_build_authenticator(wps, msg)) {
 983                 wpabuf_free(msg);
 984                 return NULL;
 985         }
 986
 987         wps->state = RECV_M3;
 988         return msg;
 989 }
 990
 991
 992 static struct wpabuf * wps_build_m2d(struct wps_data *wps)
 993 {
 994         struct wpabuf *msg;
 995         u16 err = WPS_CFG_NO_ERROR;
 996
 997         wpa_printf(MSG_DEBUG, "WPS: Building Message M2D");
 998         msg = wpabuf_alloc(1000);
 999         if (msg == NULL)
1000                 return NULL;
1001
1002         if (wps->authenticator && wps->wps->ap_setup_locked)
1003                 err = WPS_CFG_SETUP_LOCKED;
1004
1005         if (wps_build_version(msg) ||
1006             wps_build_msg_type(msg, WPS_M2D) ||
1007             wps_build_enrollee_nonce(wps, msg) ||
1008             wps_build_registrar_nonce(wps, msg) ||
1009             wps_build_uuid_r(wps, msg) ||
1010             wps_build_auth_type_flags(wps, msg) ||
1011             wps_build_encr_type_flags(wps, msg) ||
1012             wps_build_conn_type_flags(wps, msg) ||
1013             wps_build_config_methods_r(wps->registrar, msg) ||
1014             wps_build_device_attrs(&wps->wps->dev, msg) ||
1015             wps_build_rf_bands(&wps->wps->dev, msg) ||
1016             wps_build_assoc_state(wps, msg) ||
1017             wps_build_config_error(msg, err) ||
1018             wps_build_os_version(&wps->wps->dev, msg)) {
1019                 wpabuf_free(msg);
1020                 return NULL;
1021         }
1022
1023         wps->state = RECV_M2D_ACK;
1024         return msg;
1025 }
1026
1027
1028 static struct wpabuf * wps_build_m4(struct wps_data *wps)
1029 {
1030         struct wpabuf *msg, *plain;
1031
1032         wpa_printf(MSG_DEBUG, "WPS: Building Message M4");
1033
1034         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
1035
1036         plain = wpabuf_alloc(200);
1037         if (plain == NULL)
1038                 return NULL;
1039
1040         msg = wpabuf_alloc(1000);
1041         if (msg == NULL) {
1042                 wpabuf_free(plain);
1043                 return NULL;
1044         }
1045
1046         if (wps_build_version(msg) ||
1047             wps_build_msg_type(msg, WPS_M4) ||
1048             wps_build_enrollee_nonce(wps, msg) ||
1049             wps_build_r_hash(wps, msg) ||
1050             wps_build_r_snonce1(wps, plain) ||
1051             wps_build_key_wrap_auth(wps, plain) ||
1052             wps_build_encr_settings(wps, msg, plain) ||
1053             wps_build_authenticator(wps, msg)) {
1054                 wpabuf_free(plain);
1055                 wpabuf_free(msg);
1056                 return NULL;
1057         }
1058         wpabuf_free(plain);
1059
1060         wps->state = RECV_M5;
1061         return msg;
1062 }
1063
1064
1065 static struct wpabuf * wps_build_m6(struct wps_data *wps)
1066 {
1067         struct wpabuf *msg, *plain;
1068
1069         wpa_printf(MSG_DEBUG, "WPS: Building Message M6");
1070
1071         plain = wpabuf_alloc(200);
1072         if (plain == NULL)
1073                 return NULL;
1074
1075         msg = wpabuf_alloc(1000);
1076         if (msg == NULL) {
1077                 wpabuf_free(plain);
1078                 return NULL;
1079         }
1080
1081         if (wps_build_version(msg) ||
1082             wps_build_msg_type(msg, WPS_M6) ||
1083             wps_build_enrollee_nonce(wps, msg) ||
1084             wps_build_r_snonce2(wps, plain) ||
1085             wps_build_key_wrap_auth(wps, plain) ||
1086             wps_build_encr_settings(wps, msg, plain) ||
1087             wps_build_authenticator(wps, msg)) {
1088                 wpabuf_free(plain);
1089                 wpabuf_free(msg);
1090                 return NULL;
1091         }
1092         wpabuf_free(plain);
1093
1094         wps->wps_pin_revealed = 1;
1095         wps->state = RECV_M7;
1096         return msg;
1097 }
1098
1099
1100 static struct wpabuf * wps_build_m8(struct wps_data *wps)
1101 {
1102         struct wpabuf *msg, *plain;
1103
1104         wpa_printf(MSG_DEBUG, "WPS: Building Message M8");
1105
1106         plain = wpabuf_alloc(500);
1107         if (plain == NULL)
1108                 return NULL;
1109
1110         msg = wpabuf_alloc(1000);
1111         if (msg == NULL) {
1112                 wpabuf_free(plain);
1113                 return NULL;
1114         }
1115
1116         if (wps_build_version(msg) ||
1117             wps_build_msg_type(msg, WPS_M8) ||
1118             wps_build_enrollee_nonce(wps, msg) ||
1119             (wps->wps->ap && wps_build_cred(wps, plain)) ||
1120             (!wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
1121             wps_build_key_wrap_auth(wps, plain) ||
1122             wps_build_encr_settings(wps, msg, plain) ||
1123             wps_build_authenticator(wps, msg)) {
1124                 wpabuf_free(plain);
1125                 wpabuf_free(msg);
1126                 return NULL;
1127         }
1128         wpabuf_free(plain);
1129
1130         wps->state = RECV_DONE;
1131         return msg;
1132 }
1133
1134
1135 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
1136 {
1137         struct wpabuf *msg;
1138
1139         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
1140
1141         msg = wpabuf_alloc(1000);
1142         if (msg == NULL)
1143                 return NULL;
1144
1145         if (wps_build_version(msg) ||
1146             wps_build_msg_type(msg, WPS_WSC_ACK) ||
1147             wps_build_enrollee_nonce(wps, msg) ||
1148             wps_build_registrar_nonce(wps, msg)) {
1149                 wpabuf_free(msg);
1150                 return NULL;
1151         }
1152
1153         return msg;
1154 }
1155
1156
1157 struct wpabuf * wps_registrar_get_msg(struct wps_data *wps, u8 *op_code)
1158 {
1159         struct wpabuf *msg;
1160
1161         switch (wps->state) {
1162         case SEND_M2:
1163                 if (wps_get_dev_password(wps) < 0)
1164                         msg = wps_build_m2d(wps);
1165                 else
1166                         msg = wps_build_m2(wps);
1167                 *op_code = WSC_MSG;
1168                 break;
1169         case SEND_M2D:
1170                 msg = wps_build_m2d(wps);
1171                 *op_code = WSC_MSG;
1172                 break;
1173         case SEND_M4:
1174                 msg = wps_build_m4(wps);
1175                 *op_code = WSC_MSG;
1176                 break;
1177         case SEND_M6:
1178                 msg = wps_build_m6(wps);
1179                 *op_code = WSC_MSG;
1180                 break;
1181         case SEND_M8:
1182                 msg = wps_build_m8(wps);
1183                 *op_code = WSC_MSG;
1184                 break;
1185         case RECV_DONE:
1186                 msg = wps_build_wsc_ack(wps);
1187                 *op_code = WSC_ACK;
1188                 break;
1189         default:
1190                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
1191                            "a message", wps->state);
1192                 msg = NULL;
1193                 break;
1194         }
1195
1196         if (*op_code == WSC_MSG && msg) {
1197                 /* Save a copy of the last message for Authenticator derivation
1198                  */
1199                 wpabuf_free(wps->last_msg);
1200                 wps->last_msg = wpabuf_dup(msg);
1201         }
1202
1203         return msg;
1204 }
1205
1206
1207 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
1208 {
1209         if (e_nonce == NULL) {
1210                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
1211                 return -1;
1212         }
1213
1214         os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
1215         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
1216                     wps->nonce_e, WPS_NONCE_LEN);
1217
1218         return 0;
1219 }
1220
1221
1222 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
1223 {
1224         if (r_nonce == NULL) {
1225                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
1226                 return -1;
1227         }
1228
1229         if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
1230                 wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
1231                 return -1;
1232         }
1233
1234         return 0;
1235 }
1236
1237
1238 static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
1239 {
1240         if (uuid_e == NULL) {
1241                 wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
1242                 return -1;
1243         }
1244
1245         os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
1246         wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);
1247
1248         return 0;
1249 }
1250
1251
1252 static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
1253 {
1254         if (pw_id == NULL) {
1255                 wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
1256                 return -1;
1257         }
1258
1259         wps->dev_pw_id = WPA_GET_BE16(pw_id);
1260         wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);
1261
1262         return 0;
1263 }
1264
1265
1266 static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
1267 {
1268         if (e_hash1 == NULL) {
1269                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
1270                 return -1;
1271         }
1272
1273         os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
1274         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);
1275
1276         return 0;
1277 }
1278
1279
1280 static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
1281 {
1282         if (e_hash2 == NULL) {
1283                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
1284                 return -1;
1285         }
1286
1287         os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
1288         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);
1289
1290         return 0;
1291 }
1292
1293
1294 static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
1295 {
1296         u8 hash[SHA256_MAC_LEN];
1297         const u8 *addr[4];
1298         size_t len[4];
1299
1300         if (e_snonce1 == NULL) {
1301                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
1302                 return -1;
1303         }
1304
1305         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
1306                         WPS_SECRET_NONCE_LEN);
1307
1308         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
1309         addr[0] = e_snonce1;
1310         len[0] = WPS_SECRET_NONCE_LEN;
1311         addr[1] = wps->psk1;
1312         len[1] = WPS_PSK_LEN;
1313         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1314         len[2] = wpabuf_len(wps->dh_pubkey_e);
1315         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1316         len[3] = wpabuf_len(wps->dh_pubkey_r);
1317         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1318
1319         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
1320                 wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
1321                            "not match with the pre-committed value");
1322                 return -1;
1323         }
1324
1325         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
1326                    "half of the device password");
1327
1328         return 0;
1329 }
1330
1331
1332 static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
1333 {
1334         u8 hash[SHA256_MAC_LEN];
1335         const u8 *addr[4];
1336         size_t len[4];
1337
1338         if (e_snonce2 == NULL) {
1339                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
1340                 return -1;
1341         }
1342
1343         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
1344                         WPS_SECRET_NONCE_LEN);
1345
1346         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
1347         addr[0] = e_snonce2;
1348         len[0] = WPS_SECRET_NONCE_LEN;
1349         addr[1] = wps->psk2;
1350         len[1] = WPS_PSK_LEN;
1351         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1352         len[2] = wpabuf_len(wps->dh_pubkey_e);
1353         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1354         len[3] = wpabuf_len(wps->dh_pubkey_r);
1355         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1356
1357         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
1358                 wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
1359                            "not match with the pre-committed value");
1360                 wps_registrar_invalidate_pin(wps->registrar, wps->uuid_e);
1361                 return -1;
1362         }
1363
1364         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
1365                    "half of the device password");
1366         wps->wps_pin_revealed = 0;
1367         wps_registrar_unlock_pin(wps->registrar, wps->uuid_e);
1368
1369         return 0;
1370 }
1371
1372
1373 static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
1374 {
1375         if (mac_addr == NULL) {
1376                 wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
1377                 return -1;
1378         }
1379
1380         wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
1381                    MAC2STR(mac_addr));
1382         os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
1383         os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);
1384
1385         return 0;
1386 }
1387
1388
1389 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
1390                               size_t pk_len)
1391 {
1392         if (pk == NULL || pk_len == 0) {
1393                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
1394                 return -1;
1395         }
1396
1397         wpabuf_free(wps->dh_pubkey_e);
1398         wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
1399         if (wps->dh_pubkey_e == NULL)
1400                 return -1;
1401
1402         return 0;
1403 }
1404
1405
1406 static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
1407 {
1408         u16 auth_types;
1409
1410         if (auth == NULL) {
1411                 wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
1412                            "received");
1413                 return -1;
1414         }
1415
1416         auth_types = WPA_GET_BE16(auth);
1417
1418         wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
1419                    auth_types);
1420         wps->auth_type = wps->wps->auth_types & auth_types;
1421         if (wps->auth_type == 0) {
1422                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1423                            "authentication types");
1424                 return -1;
1425         }
1426
1427         return 0;
1428 }
1429
1430
1431 static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
1432 {
1433         u16 encr_types;
1434
1435         if (encr == NULL) {
1436                 wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
1437                            "received");
1438                 return -1;
1439         }
1440
1441         encr_types = WPA_GET_BE16(encr);
1442
1443         wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
1444                    encr_types);
1445         wps->encr_type = wps->wps->encr_types & encr_types;
1446         if (wps->encr_type == 0) {
1447                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1448                            "encryption types");
1449                 return -1;
1450         }
1451
1452         return 0;
1453 }
1454
1455
1456 static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
1457 {
1458         if (conn == NULL) {
1459                 wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
1460                            "received");
1461                 return -1;
1462         }
1463
1464         wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
1465                    *conn);
1466
1467         return 0;
1468 }
1469
1470
1471 static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
1472 {
1473         u16 m;
1474
1475         if (methods == NULL) {
1476                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
1477                 return -1;
1478         }
1479
1480         m = WPA_GET_BE16(methods);
1481
1482         wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
1483
1484         return 0;
1485 }
1486
1487
1488 static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
1489 {
1490         if (state == NULL) {
1491                 wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
1492                            "received");
1493                 return -1;
1494         }
1495
1496         wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
1497                    *state);
1498
1499         return 0;
1500 }
1501
1502
1503 static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
1504 {
1505         u16 a;
1506
1507         if (assoc == NULL) {
1508                 wpa_printf(MSG_DEBUG, "WPS: No Association State received");
1509                 return -1;
1510         }
1511
1512         a = WPA_GET_BE16(assoc);
1513         wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);
1514
1515         return 0;
1516 }
1517
1518
1519 static int wps_process_config_error(struct wps_data *wps, const u8 *err)
1520 {
1521         u16 e;
1522
1523         if (err == NULL) {
1524                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
1525                 return -1;
1526         }
1527
1528         e = WPA_GET_BE16(err);
1529         wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);
1530
1531         return 0;
1532 }
1533
1534
1535 static enum wps_process_res wps_process_m1(struct wps_data *wps,
1536                                            struct wps_parse_attr *attr)
1537 {
1538         wpa_printf(MSG_DEBUG, "WPS: Received M1");
1539
1540         if (wps->state != RECV_M1) {
1541                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1542                            "receiving M1", wps->state);
1543                 return WPS_FAILURE;
1544         }
1545
1546         if (wps_process_uuid_e(wps, attr->uuid_e) ||
1547             wps_process_mac_addr(wps, attr->mac_addr) ||
1548             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1549             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
1550             wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
1551             wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
1552             wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
1553             wps_process_config_methods(wps, attr->config_methods) ||
1554             wps_process_wps_state(wps, attr->wps_state) ||
1555             wps_process_device_attrs(&wps->peer_dev, attr) ||
1556             wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
1557             wps_process_assoc_state(wps, attr->assoc_state) ||
1558             wps_process_dev_password_id(wps, attr->dev_password_id) ||
1559             wps_process_config_error(wps, attr->config_error) ||
1560             wps_process_os_version(&wps->peer_dev, attr->os_version))
1561                 return WPS_FAILURE;
1562
1563         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
1564             wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
1565             wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
1566             wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
1567             (wps->dev_pw_id != DEV_PW_PUSHBUTTON || !wps->registrar->pbc)) {
1568                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
1569                            wps->dev_pw_id);
1570                 wps->state = SEND_M2D;
1571                 return WPS_CONTINUE;
1572         }
1573
1574         if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
1575                 if (wps_registrar_pbc_overlap(wps->registrar, wps->mac_addr_e,
1576                                               wps->uuid_e)) {
1577                         wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
1578                                    "negotiation");
1579                         wps->state = SEND_M2D;
1580                         return WPS_CONTINUE;
1581                 }
1582                 wps_registrar_add_pbc_session(wps->registrar, wps->mac_addr_e,
1583                                               wps->uuid_e);
1584                 wps->pbc = 1;
1585         }
1586
1587         wps->state = SEND_M2;
1588         return WPS_CONTINUE;
1589 }
1590
1591
1592 static enum wps_process_res wps_process_m3(struct wps_data *wps,
1593                                            const struct wpabuf *msg,
1594                                            struct wps_parse_attr *attr)
1595 {
1596         wpa_printf(MSG_DEBUG, "WPS: Received M3");
1597
1598         if (wps->state != RECV_M3) {
1599                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1600                            "receiving M3", wps->state);
1601                 return WPS_FAILURE;
1602         }
1603
1604         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1605             wps_process_authenticator(wps, attr->authenticator, msg) ||
1606             wps_process_e_hash1(wps, attr->e_hash1) ||
1607             wps_process_e_hash2(wps, attr->e_hash2))
1608                 return WPS_FAILURE;
1609
1610         wps->state = SEND_M4;
1611         return WPS_CONTINUE;
1612 }
1613
1614
1615 static enum wps_process_res wps_process_m5(struct wps_data *wps,
1616                                            const struct wpabuf *msg,
1617                                            struct wps_parse_attr *attr)
1618 {
1619         struct wpabuf *decrypted;
1620         struct wps_parse_attr eattr;
1621
1622         wpa_printf(MSG_DEBUG, "WPS: Received M5");
1623
1624         if (wps->state != RECV_M5) {
1625                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1626                            "receiving M5", wps->state);
1627                 return WPS_FAILURE;
1628         }
1629
1630         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1631             wps_process_authenticator(wps, attr->authenticator, msg))
1632                 return WPS_FAILURE;
1633
1634         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1635                                               attr->encr_settings_len);
1636         if (decrypted == NULL) {
1637                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1638                            "Settings attribute");
1639                 return WPS_FAILURE;
1640         }
1641
1642         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1643                    "attribute");
1644         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1645             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1646             wps_process_e_snonce1(wps, eattr.e_snonce1)) {
1647                 wpabuf_free(decrypted);
1648                 return WPS_FAILURE;
1649         }
1650         wpabuf_free(decrypted);
1651
1652         wps->state = SEND_M6;
1653         return WPS_CONTINUE;
1654 }
1655
1656
1657 static int wps_process_ap_settings_r(struct wps_data *wps,
1658                                      struct wps_parse_attr *attr)
1659 {
1660         if (wps->wps->ap)
1661                 return 0;
1662
1663         /* AP Settings Attributes in M7 when Enrollee is an AP */
1664         if (wps_process_ap_settings(attr, &wps->cred) < 0)
1665                 return -1;
1666
1667         wpa_printf(MSG_INFO, "WPS: Received old AP configuration from AP");
1668
1669         /*
1670          * TODO: Provide access to AP settings and allow changes before sending
1671          * out M8. For now, just copy the settings unchanged into M8.
1672          */
1673
1674         return 0;
1675 }
1676
1677
1678 static enum wps_process_res wps_process_m7(struct wps_data *wps,
1679                                            const struct wpabuf *msg,
1680                                            struct wps_parse_attr *attr)
1681 {
1682         struct wpabuf *decrypted;
1683         struct wps_parse_attr eattr;
1684
1685         wpa_printf(MSG_DEBUG, "WPS: Received M7");
1686
1687         if (wps->state != RECV_M7) {
1688                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1689                            "receiving M7", wps->state);
1690                 return WPS_FAILURE;
1691         }
1692
1693         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
1694             wps_process_authenticator(wps, attr->authenticator, msg))
1695                 return WPS_FAILURE;
1696
1697         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1698                                               attr->encr_settings_len);
1699         if (decrypted == NULL) {
1700                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1701                            "Settings attribute");
1702                 return WPS_FAILURE;
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_snonce2(wps, eattr.e_snonce2) ||
1710             wps_process_ap_settings_r(wps, &eattr)) {
1711                 wpabuf_free(decrypted);
1712                 return WPS_FAILURE;
1713         }
1714
1715         wpabuf_free(decrypted);
1716
1717         wps->state = SEND_M8;
1718         return WPS_CONTINUE;
1719 }
1720
1721
1722 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1723                                                 const struct wpabuf *msg)
1724 {
1725         struct wps_parse_attr attr;
1726         enum wps_process_res ret = WPS_CONTINUE;
1727
1728         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1729
1730         if (wps_parse_msg(msg, &attr) < 0)
1731                 return WPS_FAILURE;
1732
1733         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1734                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1735                            attr.version ? *attr.version : 0);
1736                 return WPS_FAILURE;
1737         }
1738
1739         if (attr.msg_type == NULL) {
1740                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1741                 return WPS_FAILURE;
1742         }
1743
1744         if (*attr.msg_type != WPS_M1 &&
1745             (attr.registrar_nonce == NULL ||
1746              os_memcmp(wps->nonce_r, attr.registrar_nonce,
1747                        WPS_NONCE_LEN != 0))) {
1748                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1749                 return WPS_FAILURE;
1750         }
1751
1752         switch (*attr.msg_type) {
1753         case WPS_M1:
1754                 ret = wps_process_m1(wps, &attr);
1755                 break;
1756         case WPS_M3:
1757                 ret = wps_process_m3(wps, msg, &attr);
1758                 break;
1759         case WPS_M5:
1760                 ret = wps_process_m5(wps, msg, &attr);
1761                 break;
1762         case WPS_M7:
1763                 ret = wps_process_m7(wps, msg, &attr);
1764                 break;
1765         default:
1766                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1767                            *attr.msg_type);
1768                 return WPS_FAILURE;
1769         }
1770
1771         if (ret == WPS_CONTINUE) {
1772                 /* Save a copy of the last message for Authenticator derivation
1773                  */
1774                 wpabuf_free(wps->last_msg);
1775                 wps->last_msg = wpabuf_dup(msg);
1776         }
1777
1778         return ret;
1779 }
1780
1781
1782 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1783                                                 const struct wpabuf *msg)
1784 {
1785         struct wps_parse_attr attr;
1786
1787         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1788
1789         if (wps_parse_msg(msg, &attr) < 0)
1790                 return WPS_FAILURE;
1791
1792         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1793                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1794                            attr.version ? *attr.version : 0);
1795                 return WPS_FAILURE;
1796         }
1797
1798         if (attr.msg_type == NULL) {
1799                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1800                 return WPS_FAILURE;
1801         }
1802
1803         if (*attr.msg_type != WPS_WSC_ACK) {
1804                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1805                            *attr.msg_type);
1806                 return WPS_FAILURE;
1807         }
1808
1809         if (attr.registrar_nonce == NULL ||
1810             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1811         {
1812                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1813                 return WPS_FAILURE;
1814         }
1815
1816         if (attr.enrollee_nonce == NULL ||
1817             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1818                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1819                 return WPS_FAILURE;
1820         }
1821
1822         if (wps->state == RECV_M2D_ACK) {
1823                 /* TODO: support for multiple registrars and sending of
1824                  * multiple M2/M2D messages */
1825
1826                 wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
1827                            "terminate negotiation");
1828         }
1829
1830         return WPS_FAILURE;
1831 }
1832
1833
1834 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1835                                                  const struct wpabuf *msg)
1836 {
1837         struct wps_parse_attr attr;
1838
1839         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1840
1841         if (wps_parse_msg(msg, &attr) < 0)
1842                 return WPS_FAILURE;
1843
1844         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1845                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1846                            attr.version ? *attr.version : 0);
1847                 return WPS_FAILURE;
1848         }
1849
1850         if (attr.msg_type == NULL) {
1851                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1852                 return WPS_FAILURE;
1853         }
1854
1855         if (*attr.msg_type != WPS_WSC_NACK) {
1856                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1857                            *attr.msg_type);
1858                 return WPS_FAILURE;
1859         }
1860
1861         if (attr.registrar_nonce == NULL ||
1862             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1863         {
1864                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1865                 return WPS_FAILURE;
1866         }
1867
1868         if (attr.enrollee_nonce == NULL ||
1869             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1870                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1871                 return WPS_FAILURE;
1872         }
1873
1874         if (attr.config_error == NULL) {
1875                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1876                            "in WSC_NACK");
1877                 return WPS_FAILURE;
1878         }
1879
1880         wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
1881                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1882
1883         return WPS_FAILURE;
1884 }
1885
1886
1887 static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
1888                                                  const struct wpabuf *msg)
1889 {
1890         struct wps_parse_attr attr;
1891
1892         wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");
1893
1894         if (wps->state != RECV_DONE) {
1895                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1896                            "receiving WSC_Done", wps->state);
1897                 return WPS_FAILURE;
1898         }
1899
1900         if (wps_parse_msg(msg, &attr) < 0)
1901                 return WPS_FAILURE;
1902
1903         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1904                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1905                            attr.version ? *attr.version : 0);
1906                 return WPS_FAILURE;
1907         }
1908
1909         if (attr.msg_type == NULL) {
1910                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1911                 return WPS_FAILURE;
1912         }
1913
1914         if (*attr.msg_type != WPS_WSC_DONE) {
1915                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1916                            *attr.msg_type);
1917                 return WPS_FAILURE;
1918         }
1919
1920         if (attr.registrar_nonce == NULL ||
1921             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1922         {
1923                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1924                 return WPS_FAILURE;
1925         }
1926
1927         if (attr.enrollee_nonce == NULL ||
1928             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1929                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1930                 return WPS_FAILURE;
1931         }
1932
1933         wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
1934
1935         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
1936             wps->wps->ap) {
1937                 struct wps_credential cred;
1938
1939                 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
1940                            "on first Enrollee connection");
1941
1942                 os_memset(&cred, 0, sizeof(cred));
1943                 os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
1944                 cred.ssid_len = wps->wps->ssid_len;
1945                 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
1946                 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
1947                 os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
1948                 cred.key_len = wps->new_psk_len;
1949
1950                 wps->wps->wps_state = WPS_STATE_CONFIGURED;
1951                 wpa_hexdump_ascii_key(MSG_DEBUG,
1952                                       "WPS: Generated random passphrase",
1953                                       wps->new_psk, wps->new_psk_len);
1954                 if (wps->wps->cred_cb)
1955                         wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
1956
1957                 os_free(wps->new_psk);
1958                 wps->new_psk = NULL;
1959         }
1960
1961         if (!wps->wps->ap) {
1962                 wpa_printf(MSG_DEBUG, "WPS: Update local configuration based "
1963                            "on the modified AP configuration");
1964                 if (wps->wps->cred_cb)
1965                         wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
1966         }
1967
1968         if (wps->new_psk) {
1969                 if (wps_cb_new_psk(wps->registrar, wps->mac_addr_e,
1970                                    wps->new_psk, wps->new_psk_len)) {
1971                         wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
1972                                    "new PSK");
1973                 }
1974                 os_free(wps->new_psk);
1975                 wps->new_psk = NULL;
1976         }
1977
1978         if (wps->pbc) {
1979                 wps_registrar_remove_pbc_session(wps->registrar,
1980                                                  wps->mac_addr_e, wps->uuid_e);
1981                 wps_registrar_pbc_completed(wps->registrar);
1982         }
1983
1984         return WPS_DONE;
1985 }
1986
1987
1988 enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
1989                                                u8 op_code,
1990                                                const struct wpabuf *msg)
1991 {
1992
1993         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1994                    "op_code=%d)",
1995                    (unsigned long) wpabuf_len(msg), op_code);
1996
1997         switch (op_code) {
1998         case WSC_MSG:
1999                 return wps_process_wsc_msg(wps, msg);
2000         case WSC_ACK:
2001                 return wps_process_wsc_ack(wps, msg);
2002         case WSC_NACK:
2003                 return wps_process_wsc_nack(wps, msg);
2004         case WSC_Done:
2005                 return wps_process_wsc_done(wps, msg);
2006         default:
2007                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
2008                 return WPS_FAILURE;
2009         }
2010 }