src/wps/wps_registrar.c

   1 /*
   2  * Wi-Fi Protected Setup - Registrar
   3  * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "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 #include "wps_upnp.h"
  25 #include "crypto.h"
  26 #include "uuid.h"
  27
  28 #define WPS_WORKAROUNDS
  29
  30 struct wps_uuid_pin {
  31         struct wps_uuid_pin *next;
  32         u8 uuid[WPS_UUID_LEN];
  33         int wildcard_uuid;
  34         u8 *pin;
  35         size_t pin_len;
  36 #define PIN_LOCKED BIT(0)
  37 #define PIN_EXPIRES BIT(1)
  38         int flags;
  39         struct os_time expiration;
  40 };
  41
  42
  43 static void wps_free_pin(struct wps_uuid_pin *pin)
  44 {
  45         os_free(pin->pin);
  46         os_free(pin);
  47 }
  48
  49
  50 static void wps_free_pins(struct wps_uuid_pin *pins)
  51 {
  52         struct wps_uuid_pin *pin, *prev;
  53
  54         pin = pins;
  55         while (pin) {
  56                 prev = pin;
  57                 pin = pin->next;
  58                 wps_free_pin(prev);
  59         }
  60 }
  61
  62
  63 struct wps_pbc_session {
  64         struct wps_pbc_session *next;
  65         u8 addr[ETH_ALEN];
  66         u8 uuid_e[WPS_UUID_LEN];
  67         struct os_time timestamp;
  68 };
  69
  70
  71 static void wps_free_pbc_sessions(struct wps_pbc_session *pbc)
  72 {
  73         struct wps_pbc_session *prev;
  74
  75         while (pbc) {
  76                 prev = pbc;
  77                 pbc = pbc->next;
  78                 os_free(prev);
  79         }
  80 }
  81
  82
  83 struct wps_registrar_device {
  84         struct wps_registrar_device *next;
  85         struct wps_device_data dev;
  86         u8 uuid[WPS_UUID_LEN];
  87 };
  88
  89
  90 struct wps_registrar {
  91         struct wps_context *wps;
  92
  93         int pbc;
  94         int selected_registrar;
  95
  96         int (*new_psk_cb)(void *ctx, const u8 *mac_addr, const u8 *psk,
  97                           size_t psk_len);
  98         int (*set_ie_cb)(void *ctx, const u8 *beacon_ie, size_t beacon_ie_len,
  99                          const u8 *probe_resp_ie, size_t probe_resp_ie_len);
 100         void (*pin_needed_cb)(void *ctx, const u8 *uuid_e,
 101                               const struct wps_device_data *dev);
 102         void (*reg_success_cb)(void *ctx, const u8 *mac_addr,
 103                                const u8 *uuid_e);
 104         void *cb_ctx;
 105
 106         struct wps_uuid_pin *pins;
 107         struct wps_pbc_session *pbc_sessions;
 108
 109         int skip_cred_build;
 110         struct wpabuf *extra_cred;
 111         int disable_auto_conf;
 112         int sel_reg_dev_password_id_override;
 113         int sel_reg_config_methods_override;
 114         int static_wep_only;
 115
 116         struct wps_registrar_device *devices;
 117
 118         int force_pbc_overlap;
 119 };
 120
 121
 122 static int wps_set_ie(struct wps_registrar *reg);
 123 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx);
 124 static void wps_registrar_set_selected_timeout(void *eloop_ctx,
 125                                                void *timeout_ctx);
 126
 127
 128 static void wps_free_devices(struct wps_registrar_device *dev)
 129 {
 130         struct wps_registrar_device *prev;
 131
 132         while (dev) {
 133                 prev = dev;
 134                 dev = dev->next;
 135                 wps_device_data_free(&prev->dev);
 136                 os_free(prev);
 137         }
 138 }
 139
 140
 141 static struct wps_registrar_device * wps_device_get(struct wps_registrar *reg,
 142                                                     const u8 *addr)
 143 {
 144         struct wps_registrar_device *dev;
 145
 146         for (dev = reg->devices; dev; dev = dev->next) {
 147                 if (os_memcmp(dev->dev.mac_addr, addr, ETH_ALEN) == 0)
 148                         return dev;
 149         }
 150         return NULL;
 151 }
 152
 153
 154 static void wps_device_clone_data(struct wps_device_data *dst,
 155                                   struct wps_device_data *src)
 156 {
 157         os_memcpy(dst->mac_addr, src->mac_addr, ETH_ALEN);
 158         dst->categ = src->categ;
 159         dst->oui = src->oui;
 160         dst->sub_categ = src->sub_categ;
 161
 162 #define WPS_STRDUP(n) \
 163         os_free(dst->n); \
 164         dst->n = src->n ? os_strdup(src->n) : NULL
 165
 166         WPS_STRDUP(device_name);
 167         WPS_STRDUP(manufacturer);
 168         WPS_STRDUP(model_name);
 169         WPS_STRDUP(model_number);
 170         WPS_STRDUP(serial_number);
 171 #undef WPS_STRDUP
 172 }
 173
 174
 175 int wps_device_store(struct wps_registrar *reg,
 176                      struct wps_device_data *dev, const u8 *uuid)
 177 {
 178         struct wps_registrar_device *d;
 179
 180         d = wps_device_get(reg, dev->mac_addr);
 181         if (d == NULL) {
 182                 d = os_zalloc(sizeof(*d));
 183                 if (d == NULL)
 184                         return -1;
 185                 d->next = reg->devices;
 186                 reg->devices = d;
 187         }
 188
 189         wps_device_clone_data(&d->dev, dev);
 190         os_memcpy(d->uuid, uuid, WPS_UUID_LEN);
 191
 192         return 0;
 193 }
 194
 195
 196 static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
 197                                           const u8 *addr, const u8 *uuid_e)
 198 {
 199         struct wps_pbc_session *pbc, *prev = NULL;
 200         struct os_time now;
 201
 202         os_get_time(&now);
 203
 204         pbc = reg->pbc_sessions;
 205         while (pbc) {
 206                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 207                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 208                         if (prev)
 209                                 prev->next = pbc->next;
 210                         else
 211                                 reg->pbc_sessions = pbc->next;
 212                         break;
 213                 }
 214                 prev = pbc;
 215                 pbc = pbc->next;
 216         }
 217
 218         if (!pbc) {
 219                 pbc = os_zalloc(sizeof(*pbc));
 220                 if (pbc == NULL)
 221                         return;
 222                 os_memcpy(pbc->addr, addr, ETH_ALEN);
 223                 if (uuid_e)
 224                         os_memcpy(pbc->uuid_e, uuid_e, WPS_UUID_LEN);
 225         }
 226
 227         pbc->next = reg->pbc_sessions;
 228         reg->pbc_sessions = pbc;
 229         pbc->timestamp = now;
 230
 231         /* remove entries that have timed out */
 232         prev = pbc;
 233         pbc = pbc->next;
 234
 235         while (pbc) {
 236                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME) {
 237                         prev->next = NULL;
 238                         wps_free_pbc_sessions(pbc);
 239                         break;
 240                 }
 241                 prev = pbc;
 242                 pbc = pbc->next;
 243         }
 244 }
 245
 246
 247 static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
 248                                              const u8 *addr, const u8 *uuid_e)
 249 {
 250         struct wps_pbc_session *pbc, *prev = NULL;
 251
 252         pbc = reg->pbc_sessions;
 253         while (pbc) {
 254                 if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
 255                     os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 256                         if (prev)
 257                                 prev->next = pbc->next;
 258                         else
 259                                 reg->pbc_sessions = pbc->next;
 260                         os_free(pbc);
 261                         break;
 262                 }
 263                 prev = pbc;
 264                 pbc = pbc->next;
 265         }
 266 }
 267
 268
 269 static int wps_registrar_pbc_overlap(struct wps_registrar *reg,
 270                                      const u8 *addr, const u8 *uuid_e)
 271 {
 272         int count = 0;
 273         struct wps_pbc_session *pbc;
 274         struct os_time now;
 275
 276         os_get_time(&now);
 277
 278         for (pbc = reg->pbc_sessions; pbc; pbc = pbc->next) {
 279                 if (now.sec > pbc->timestamp.sec + WPS_PBC_WALK_TIME)
 280                         break;
 281                 if (addr == NULL || os_memcmp(addr, pbc->addr, ETH_ALEN) ||
 282                     uuid_e == NULL ||
 283                     os_memcmp(uuid_e, pbc->uuid_e, WPS_UUID_LEN))
 284                         count++;
 285         }
 286
 287         if (addr || uuid_e)
 288                 count++;
 289
 290         return count > 1 ? 1 : 0;
 291 }
 292
 293
 294 static int wps_build_wps_state(struct wps_context *wps, struct wpabuf *msg)
 295 {
 296         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
 297                    wps->wps_state);
 298         wpabuf_put_be16(msg, ATTR_WPS_STATE);
 299         wpabuf_put_be16(msg, 1);
 300         wpabuf_put_u8(msg, wps->wps_state);
 301         return 0;
 302 }
 303
 304
 305 #ifdef CONFIG_WPS_UPNP
 306 static void wps_registrar_free_pending_m2(struct wps_context *wps)
 307 {
 308         struct upnp_pending_message *p, *p2, *prev = NULL;
 309         p = wps->upnp_msgs;
 310         while (p) {
 311                 if (p->type == WPS_M2 || p->type == WPS_M2D) {
 312                         if (prev == NULL)
 313                                 wps->upnp_msgs = p->next;
 314                         else
 315                                 prev->next = p->next;
 316                         wpa_printf(MSG_DEBUG, "WPS UPnP: Drop pending M2/M2D");
 317                         p2 = p;
 318                         p = p->next;
 319                         wpabuf_free(p2->msg);
 320                         os_free(p2);
 321                         continue;
 322                 }
 323                 prev = p;
 324                 p = p->next;
 325         }
 326 }
 327 #endif /* CONFIG_WPS_UPNP */
 328
 329
 330 static int wps_build_ap_setup_locked(struct wps_context *wps,
 331                                      struct wpabuf *msg)
 332 {
 333         if (wps->ap_setup_locked) {
 334                 wpa_printf(MSG_DEBUG, "WPS:  * AP Setup Locked");
 335                 wpabuf_put_be16(msg, ATTR_AP_SETUP_LOCKED);
 336                 wpabuf_put_be16(msg, 1);
 337                 wpabuf_put_u8(msg, 1);
 338         }
 339         return 0;
 340 }
 341
 342
 343 static int wps_build_selected_registrar(struct wps_registrar *reg,
 344                                         struct wpabuf *msg)
 345 {
 346         if (!reg->selected_registrar)
 347                 return 0;
 348         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar");
 349         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR);
 350         wpabuf_put_be16(msg, 1);
 351         wpabuf_put_u8(msg, 1);
 352         return 0;
 353 }
 354
 355
 356 static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
 357                                              struct wpabuf *msg)
 358 {
 359         u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
 360         if (!reg->selected_registrar)
 361                 return 0;
 362         if (reg->sel_reg_dev_password_id_override >= 0)
 363                 id = reg->sel_reg_dev_password_id_override;
 364         wpa_printf(MSG_DEBUG, "WPS:  * Device Password ID (%d)", id);
 365         wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
 366         wpabuf_put_be16(msg, 2);
 367         wpabuf_put_be16(msg, id);
 368         return 0;
 369 }
 370
 371
 372 static int wps_build_sel_reg_config_methods(struct wps_registrar *reg,
 373                                             struct wpabuf *msg)
 374 {
 375         u16 methods;
 376         if (!reg->selected_registrar)
 377                 return 0;
 378         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 379         if (reg->pbc)
 380                 methods |= WPS_CONFIG_PUSHBUTTON;
 381         if (reg->sel_reg_config_methods_override >= 0)
 382                 methods = reg->sel_reg_config_methods_override;
 383         wpa_printf(MSG_DEBUG, "WPS:  * Selected Registrar Config Methods (%x)",
 384                    methods);
 385         wpabuf_put_be16(msg, ATTR_SELECTED_REGISTRAR_CONFIG_METHODS);
 386         wpabuf_put_be16(msg, 2);
 387         wpabuf_put_be16(msg, methods);
 388         return 0;
 389 }
 390
 391
 392 static int wps_build_probe_config_methods(struct wps_registrar *reg,
 393                                           struct wpabuf *msg)
 394 {
 395         u16 methods;
 396         methods = 0;
 397         wpa_printf(MSG_DEBUG, "WPS:  * Config Methods (%x)", methods);
 398         wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
 399         wpabuf_put_be16(msg, 2);
 400         wpabuf_put_be16(msg, methods);
 401         return 0;
 402 }
 403
 404
 405 static int wps_build_config_methods_r(struct wps_registrar *reg,
 406                                       struct wpabuf *msg)
 407 {
 408         u16 methods;
 409         methods = reg->wps->config_methods & ~WPS_CONFIG_PUSHBUTTON;
 410         if (reg->pbc)
 411                 methods |= WPS_CONFIG_PUSHBUTTON;
 412         return wps_build_config_methods(msg, methods);
 413 }
 414
 415
 416 static int wps_build_resp_type(struct wps_registrar *reg, struct wpabuf *msg)
 417 {
 418         u8 resp = reg->wps->ap ? WPS_RESP_AP : WPS_RESP_REGISTRAR;
 419         wpa_printf(MSG_DEBUG, "WPS:  * Response Type (%d)", resp);
 420         wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
 421         wpabuf_put_be16(msg, 1);
 422         wpabuf_put_u8(msg, resp);
 423         return 0;
 424 }
 425
 426
 427 /**
 428  * wps_registrar_init - Initialize WPS Registrar data
 429  * @wps: Pointer to longterm WPS context
 430  * @cfg: Registrar configuration
 431  * Returns: Pointer to allocated Registrar data or %NULL on failure
 432  *
 433  * This function is used to initialize WPS Registrar functionality. It can be
 434  * used for a single Registrar run (e.g., when run in a supplicant) or multiple
 435  * runs (e.g., when run as an internal Registrar in an AP). Caller is
 436  * responsible for freeing the returned data with wps_registrar_deinit() when
 437  * Registrar functionality is not needed anymore.
 438  */
 439 struct wps_registrar *
 440 wps_registrar_init(struct wps_context *wps,
 441                    const struct wps_registrar_config *cfg)
 442 {
 443         struct wps_registrar *reg = os_zalloc(sizeof(*reg));
 444         if (reg == NULL)
 445                 return NULL;
 446
 447         reg->wps = wps;
 448         reg->new_psk_cb = cfg->new_psk_cb;
 449         reg->set_ie_cb = cfg->set_ie_cb;
 450         reg->pin_needed_cb = cfg->pin_needed_cb;
 451         reg->reg_success_cb = cfg->reg_success_cb;
 452         reg->cb_ctx = cfg->cb_ctx;
 453         reg->skip_cred_build = cfg->skip_cred_build;
 454         if (cfg->extra_cred) {
 455                 reg->extra_cred = wpabuf_alloc_copy(cfg->extra_cred,
 456                                                     cfg->extra_cred_len);
 457                 if (reg->extra_cred == NULL) {
 458                         os_free(reg);
 459                         return NULL;
 460                 }
 461         }
 462         reg->disable_auto_conf = cfg->disable_auto_conf;
 463         reg->sel_reg_dev_password_id_override = -1;
 464         reg->sel_reg_config_methods_override = -1;
 465         reg->static_wep_only = cfg->static_wep_only;
 466
 467         if (wps_set_ie(reg)) {
 468                 wps_registrar_deinit(reg);
 469                 return NULL;
 470         }
 471
 472         return reg;
 473 }
 474
 475
 476 /**
 477  * wps_registrar_deinit - Deinitialize WPS Registrar data
 478  * @reg: Registrar data from wps_registrar_init()
 479  */
 480 void wps_registrar_deinit(struct wps_registrar *reg)
 481 {
 482         if (reg == NULL)
 483                 return;
 484         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 485         eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
 486         wps_free_pins(reg->pins);
 487         wps_free_pbc_sessions(reg->pbc_sessions);
 488         wpabuf_free(reg->extra_cred);
 489         wps_free_devices(reg->devices);
 490         os_free(reg);
 491 }
 492
 493
 494 /**
 495  * wps_registrar_add_pin - Configure a new PIN for Registrar
 496  * @reg: Registrar data from wps_registrar_init()
 497  * @uuid: UUID-E or %NULL for wildcard (any UUID)
 498  * @pin: PIN (Device Password)
 499  * @pin_len: Length of pin in octets
 500  * @timeout: Time (in seconds) when the PIN will be invalidated; 0 = no timeout
 501  * Returns: 0 on success, -1 on failure
 502  */
 503 int wps_registrar_add_pin(struct wps_registrar *reg, const u8 *uuid,
 504                           const u8 *pin, size_t pin_len, int timeout)
 505 {
 506         struct wps_uuid_pin *p;
 507
 508         p = os_zalloc(sizeof(*p));
 509         if (p == NULL)
 510                 return -1;
 511         if (uuid == NULL)
 512                 p->wildcard_uuid = 1;
 513         else
 514                 os_memcpy(p->uuid, uuid, WPS_UUID_LEN);
 515         p->pin = os_malloc(pin_len);
 516         if (p->pin == NULL) {
 517                 os_free(p);
 518                 return -1;
 519         }
 520         os_memcpy(p->pin, pin, pin_len);
 521         p->pin_len = pin_len;
 522
 523         if (timeout) {
 524                 p->flags |= PIN_EXPIRES;
 525                 os_get_time(&p->expiration);
 526                 p->expiration.sec += timeout;
 527         }
 528
 529         p->next = reg->pins;
 530         reg->pins = p;
 531
 532         wpa_printf(MSG_DEBUG, "WPS: A new PIN configured (timeout=%d)",
 533                    timeout);
 534         wpa_hexdump(MSG_DEBUG, "WPS: UUID", uuid, WPS_UUID_LEN);
 535         wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: PIN", pin, pin_len);
 536         reg->selected_registrar = 1;
 537         reg->pbc = 0;
 538         wps_set_ie(reg);
 539         eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
 540         eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
 541                                wps_registrar_set_selected_timeout,
 542                                reg, NULL);
 543
 544         return 0;
 545 }
 546
 547
 548 static void wps_registrar_expire_pins(struct wps_registrar *reg)
 549 {
 550         struct wps_uuid_pin *pin, *prev, *del;
 551         struct os_time now;
 552
 553         os_get_time(&now);
 554         prev = NULL;
 555         pin = reg->pins;
 556         while (pin) {
 557                 if ((pin->flags & PIN_EXPIRES) &&
 558                     os_time_before(&pin->expiration, &now)) {
 559                         if (prev == NULL)
 560                                 reg->pins = pin->next;
 561                         else
 562                                 prev->next = pin->next;
 563                         del = pin;
 564                         pin = pin->next;
 565                         wpa_hexdump(MSG_DEBUG, "WPS: Expired PIN for UUID",
 566                                     del->uuid, WPS_UUID_LEN);
 567                         wps_free_pin(del);
 568                         continue;
 569                 }
 570                 prev = pin;
 571                 pin = pin->next;
 572         }
 573 }
 574
 575
 576 /**
 577  * wps_registrar_invalidate_pin - Invalidate a PIN for a specific UUID-E
 578  * @reg: Registrar data from wps_registrar_init()
 579  * @uuid: UUID-E
 580  * Returns: 0 on success, -1 on failure (e.g., PIN not found)
 581  */
 582 int wps_registrar_invalidate_pin(struct wps_registrar *reg, const u8 *uuid)
 583 {
 584         struct wps_uuid_pin *pin, *prev;
 585
 586         prev = NULL;
 587         pin = reg->pins;
 588         while (pin) {
 589                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 590                         if (prev == NULL)
 591                                 reg->pins = pin->next;
 592                         else
 593                                 prev->next = pin->next;
 594                         wpa_hexdump(MSG_DEBUG, "WPS: Invalidated PIN for UUID",
 595                                     pin->uuid, WPS_UUID_LEN);
 596                         wps_free_pin(pin);
 597                         return 0;
 598                 }
 599                 prev = pin;
 600                 pin = pin->next;
 601         }
 602
 603         return -1;
 604 }
 605
 606
 607 static const u8 * wps_registrar_get_pin(struct wps_registrar *reg,
 608                                         const u8 *uuid, size_t *pin_len)
 609 {
 610         struct wps_uuid_pin *pin;
 611
 612         wps_registrar_expire_pins(reg);
 613
 614         pin = reg->pins;
 615         while (pin) {
 616                 if (!pin->wildcard_uuid &&
 617                     os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0)
 618                         break;
 619                 pin = pin->next;
 620         }
 621
 622         if (!pin) {
 623                 /* Check for wildcard UUIDs since none of the UUID-specific
 624                  * PINs matched */
 625                 pin = reg->pins;
 626                 while (pin) {
 627                         if (pin->wildcard_uuid == 1) {
 628                                 wpa_printf(MSG_DEBUG, "WPS: Found a wildcard "
 629                                            "PIN. Assigned it for this UUID-E");
 630                                 pin->wildcard_uuid = 2;
 631                                 os_memcpy(pin->uuid, uuid, WPS_UUID_LEN);
 632                                 break;
 633                         }
 634                         pin = pin->next;
 635                 }
 636         }
 637
 638         if (!pin)
 639                 return NULL;
 640
 641         /*
 642          * Lock the PIN to avoid attacks based on concurrent re-use of the PIN
 643          * that could otherwise avoid PIN invalidations.
 644          */
 645         if (pin->flags & PIN_LOCKED) {
 646                 wpa_printf(MSG_DEBUG, "WPS: Selected PIN locked - do not "
 647                            "allow concurrent re-use");
 648                 return NULL;
 649         }
 650         *pin_len = pin->pin_len;
 651         pin->flags |= PIN_LOCKED;
 652         return pin->pin;
 653 }
 654
 655
 656 /**
 657  * wps_registrar_unlock_pin - Unlock a PIN for a specific UUID-E
 658  * @reg: Registrar data from wps_registrar_init()
 659  * @uuid: UUID-E
 660  * Returns: 0 on success, -1 on failure
 661  *
 662  * PINs are locked to enforce only one concurrent use. This function unlocks a
 663  * PIN to allow it to be used again. If the specified PIN was configured using
 664  * a wildcard UUID, it will be removed instead of allowing multiple uses.
 665  */
 666 int wps_registrar_unlock_pin(struct wps_registrar *reg, const u8 *uuid)
 667 {
 668         struct wps_uuid_pin *pin;
 669
 670         pin = reg->pins;
 671         while (pin) {
 672                 if (os_memcmp(pin->uuid, uuid, WPS_UUID_LEN) == 0) {
 673                         if (pin->wildcard_uuid == 2) {
 674                                 wpa_printf(MSG_DEBUG, "WPS: Invalidating used "
 675                                            "wildcard PIN");
 676                                 return wps_registrar_invalidate_pin(reg, uuid);
 677                         }
 678                         pin->flags &= ~PIN_LOCKED;
 679                         return 0;
 680                 }
 681                 pin = pin->next;
 682         }
 683
 684         return -1;
 685 }
 686
 687
 688 static void wps_registrar_stop_pbc(struct wps_registrar *reg)
 689 {
 690         reg->selected_registrar = 0;
 691         reg->pbc = 0;
 692         wps_set_ie(reg);
 693 }
 694
 695
 696 static void wps_registrar_pbc_timeout(void *eloop_ctx, void *timeout_ctx)
 697 {
 698         struct wps_registrar *reg = eloop_ctx;
 699
 700         wpa_printf(MSG_DEBUG, "WPS: PBC timed out - disable PBC mode");
 701         wps_pbc_timeout_event(reg->wps);
 702         wps_registrar_stop_pbc(reg);
 703 }
 704
 705
 706 /**
 707  * wps_registrar_button_pushed - Notify Registrar that AP button was pushed
 708  * @reg: Registrar data from wps_registrar_init()
 709  * Returns: 0 on success, -1 on failure
 710  *
 711  * This function is called on an AP when a push button is pushed to activate
 712  * PBC mode. The PBC mode will be stopped after walk time (2 minutes) timeout
 713  * or when a PBC registration is completed.
 714  */
 715 int wps_registrar_button_pushed(struct wps_registrar *reg)
 716 {
 717         if (wps_registrar_pbc_overlap(reg, NULL, NULL)) {
 718                 wpa_printf(MSG_DEBUG, "WPS: PBC overlap - do not start PBC "
 719                            "mode");
 720                 wps_pbc_overlap_event(reg->wps);
 721                 return -1;
 722         }
 723         wpa_printf(MSG_DEBUG, "WPS: Button pushed - PBC mode started");
 724         reg->force_pbc_overlap = 0;
 725         reg->selected_registrar = 1;
 726         reg->pbc = 1;
 727         wps_set_ie(reg);
 728
 729         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 730         eloop_register_timeout(WPS_PBC_WALK_TIME, 0, wps_registrar_pbc_timeout,
 731                                reg, NULL);
 732         return 0;
 733 }
 734
 735
 736 static void wps_registrar_pbc_completed(struct wps_registrar *reg)
 737 {
 738         wpa_printf(MSG_DEBUG, "WPS: PBC completed - stopping PBC mode");
 739         eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 740         wps_registrar_stop_pbc(reg);
 741 }
 742
 743 static void wps_registrar_pin_completed(struct wps_registrar *reg)
 744 {
 745         wpa_printf(MSG_DEBUG, "WPS: PIN completed using internal Registrar");
 746         eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
 747         reg->selected_registrar = 0;
 748         wps_set_ie(reg);
 749 }
 750
 751
 752 /**
 753  * wps_registrar_probe_req_rx - Notify Registrar of Probe Request
 754  * @reg: Registrar data from wps_registrar_init()
 755  * @addr: MAC address of the Probe Request sender
 756  * @wps_data: WPS IE contents
 757  *
 758  * This function is called on an AP when a Probe Request with WPS IE is
 759  * received. This is used to track PBC mode use and to detect possible overlap
 760  * situation with other WPS APs.
 761  */
 762 void wps_registrar_probe_req_rx(struct wps_registrar *reg, const u8 *addr,
 763                                 const struct wpabuf *wps_data)
 764 {
 765         struct wps_parse_attr attr;
 766         u16 methods;
 767
 768         wpa_hexdump_buf(MSG_MSGDUMP,
 769                         "WPS: Probe Request with WPS data received",
 770                         wps_data);
 771
 772         if (wps_parse_msg(wps_data, &attr) < 0)
 773                 return;
 774         if (!wps_version_supported(attr.version)) {
 775                 wpa_printf(MSG_DEBUG, "WPS: Unsupported ProbeReq WPS IE "
 776                            "version 0x%x", attr.version ? *attr.version : 0);
 777                 return;
 778         }
 779
 780         if (attr.config_methods == NULL) {
 781                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods attribute in "
 782                            "Probe Request");
 783                 return;
 784         }
 785
 786         methods = WPA_GET_BE16(attr.config_methods);
 787         if (!(methods & WPS_CONFIG_PUSHBUTTON))
 788                 return; /* Not PBC */
 789
 790         wpa_printf(MSG_DEBUG, "WPS: Probe Request for PBC received from "
 791                    MACSTR, MAC2STR(addr));
 792
 793         wps_registrar_add_pbc_session(reg, addr, attr.uuid_e);
 794         if (wps_registrar_pbc_overlap(reg, addr, attr.uuid_e)) {
 795                 wpa_printf(MSG_DEBUG, "WPS: PBC session overlap detected");
 796                 reg->force_pbc_overlap = 1;
 797                 wps_pbc_overlap_event(reg->wps);
 798         }
 799 }
 800
 801
 802 static int wps_cb_new_psk(struct wps_registrar *reg, const u8 *mac_addr,
 803                           const u8 *psk, size_t psk_len)
 804 {
 805         if (reg->new_psk_cb == NULL)
 806                 return 0;
 807
 808         return reg->new_psk_cb(reg->cb_ctx, mac_addr, psk, psk_len);
 809 }
 810
 811
 812 static void wps_cb_pin_needed(struct wps_registrar *reg, const u8 *uuid_e,
 813                               const struct wps_device_data *dev)
 814 {
 815         if (reg->pin_needed_cb == NULL)
 816                 return;
 817
 818         reg->pin_needed_cb(reg->cb_ctx, uuid_e, dev);
 819 }
 820
 821
 822 static void wps_cb_reg_success(struct wps_registrar *reg, const u8 *mac_addr,
 823                                const u8 *uuid_e)
 824 {
 825         if (reg->reg_success_cb == NULL)
 826                 return;
 827
 828         reg->reg_success_cb(reg->cb_ctx, mac_addr, uuid_e);
 829 }
 830
 831
 832 static int wps_cb_set_ie(struct wps_registrar *reg,
 833                          const struct wpabuf *beacon_ie,
 834                          const struct wpabuf *probe_resp_ie)
 835 {
 836         if (reg->set_ie_cb == NULL)
 837                 return 0;
 838
 839         return reg->set_ie_cb(reg->cb_ctx, wpabuf_head(beacon_ie),
 840                               wpabuf_len(beacon_ie),
 841                               wpabuf_head(probe_resp_ie),
 842                               wpabuf_len(probe_resp_ie));
 843 }
 844
 845
 846 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
 847 static struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
 848 {
 849         struct wpabuf *ie;
 850         const u8 *pos, *end;
 851
 852         ie = wpabuf_alloc(wpabuf_len(data) + 100);
 853         if (ie == NULL) {
 854                 wpabuf_free(data);
 855                 return NULL;
 856         }
 857
 858         pos = wpabuf_head(data);
 859         end = pos + wpabuf_len(data);
 860
 861         while (end > pos) {
 862                 size_t frag_len = end - pos;
 863                 if (frag_len > 251)
 864                         frag_len = 251;
 865                 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 866                 wpabuf_put_u8(ie, 4 + frag_len);
 867                 wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
 868                 wpabuf_put_data(ie, pos, frag_len);
 869                 pos += frag_len;
 870         }
 871
 872         wpabuf_free(data);
 873
 874         return ie;
 875 }
 876
 877
 878 static int wps_set_ie(struct wps_registrar *reg)
 879 {
 880         struct wpabuf *beacon;
 881         struct wpabuf *probe;
 882         int ret;
 883
 884         wpa_printf(MSG_DEBUG, "WPS: Build Beacon and Probe Response IEs");
 885
 886         beacon = wpabuf_alloc(300);
 887         if (beacon == NULL)
 888                 return -1;
 889         probe = wpabuf_alloc(400);
 890         if (probe == NULL) {
 891                 wpabuf_free(beacon);
 892                 return -1;
 893         }
 894
 895         if (wps_build_version(beacon) ||
 896             wps_build_wps_state(reg->wps, beacon) ||
 897             wps_build_ap_setup_locked(reg->wps, beacon) ||
 898             wps_build_selected_registrar(reg, beacon) ||
 899             wps_build_sel_reg_dev_password_id(reg, beacon) ||
 900             wps_build_sel_reg_config_methods(reg, beacon) ||
 901             wps_build_version(probe) ||
 902             wps_build_wps_state(reg->wps, probe) ||
 903             wps_build_ap_setup_locked(reg->wps, probe) ||
 904             wps_build_selected_registrar(reg, probe) ||
 905             wps_build_sel_reg_dev_password_id(reg, probe) ||
 906             wps_build_sel_reg_config_methods(reg, probe) ||
 907             wps_build_resp_type(reg, probe) ||
 908             wps_build_uuid_e(probe, reg->wps->uuid) ||
 909             wps_build_device_attrs(&reg->wps->dev, probe) ||
 910             wps_build_probe_config_methods(reg, probe) ||
 911             wps_build_rf_bands(&reg->wps->dev, probe)) {
 912                 wpabuf_free(beacon);
 913                 wpabuf_free(probe);
 914                 return -1;
 915         }
 916
 917         beacon = wps_ie_encapsulate(beacon);
 918         probe = wps_ie_encapsulate(probe);
 919
 920         if (!beacon || !probe) {
 921                 wpabuf_free(beacon);
 922                 wpabuf_free(probe);
 923                 return -1;
 924         }
 925
 926         if (reg->static_wep_only) {
 927                 /*
 928                  * Windows XP and Vista clients can get confused about
 929                  * EAP-Identity/Request when they probe the network with
 930                  * EAPOL-Start. In such a case, they may assume the network is
 931                  * using IEEE 802.1X and prompt user for a certificate while
 932                  * the correct (non-WPS) behavior would be to ask for the
 933                  * static WEP key. As a workaround, use Microsoft Provisioning
 934                  * IE to advertise that legacy 802.1X is not supported.
 935                  */
 936                 const u8 ms_wps[7] = {
 937                         WLAN_EID_VENDOR_SPECIFIC, 5,
 938                         /* Microsoft Provisioning IE (00:50:f2:5) */
 939                         0x00, 0x50, 0xf2, 5,
 940                         0x00 /* no legacy 802.1X or MS WPS */
 941                 };
 942                 wpa_printf(MSG_DEBUG, "WPS: Add Microsoft Provisioning IE "
 943                            "into Beacon/Probe Response frames");
 944                 wpabuf_put_data(beacon, ms_wps, sizeof(ms_wps));
 945                 wpabuf_put_data(probe, ms_wps, sizeof(ms_wps));
 946         }
 947
 948         ret = wps_cb_set_ie(reg, beacon, probe);
 949         wpabuf_free(beacon);
 950         wpabuf_free(probe);
 951
 952         return ret;
 953 }
 954
 955
 956 static int wps_get_dev_password(struct wps_data *wps)
 957 {
 958         const u8 *pin;
 959         size_t pin_len = 0;
 960
 961         os_free(wps->dev_password);
 962         wps->dev_password = NULL;
 963
 964         if (wps->pbc) {
 965                 wpa_printf(MSG_DEBUG, "WPS: Use default PIN for PBC");
 966                 pin = (const u8 *) "00000000";
 967                 pin_len = 8;
 968         } else {
 969                 pin = wps_registrar_get_pin(wps->wps->registrar, wps->uuid_e,
 970                                             &pin_len);
 971         }
 972         if (pin == NULL) {
 973                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available for "
 974                            "the Enrollee");
 975                 wps_cb_pin_needed(wps->wps->registrar, wps->uuid_e,
 976                                   &wps->peer_dev);
 977                 return -1;
 978         }
 979
 980         wps->dev_password = os_malloc(pin_len);
 981         if (wps->dev_password == NULL)
 982                 return -1;
 983         os_memcpy(wps->dev_password, pin, pin_len);
 984         wps->dev_password_len = pin_len;
 985
 986         return 0;
 987 }
 988
 989
 990 static int wps_build_uuid_r(struct wps_data *wps, struct wpabuf *msg)
 991 {
 992         wpa_printf(MSG_DEBUG, "WPS:  * UUID-R");
 993         wpabuf_put_be16(msg, ATTR_UUID_R);
 994         wpabuf_put_be16(msg, WPS_UUID_LEN);
 995         wpabuf_put_data(msg, wps->uuid_r, WPS_UUID_LEN);
 996         return 0;
 997 }
 998
 999
1000 static int wps_build_r_hash(struct wps_data *wps, struct wpabuf *msg)
1001 {
1002         u8 *hash;
1003         const u8 *addr[4];
1004         size_t len[4];
1005
1006         if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
1007                 return -1;
1008         wpa_hexdump(MSG_DEBUG, "WPS: R-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
1009         wpa_hexdump(MSG_DEBUG, "WPS: R-S2",
1010                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
1011
1012         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
1013                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
1014                            "R-Hash derivation");
1015                 return -1;
1016         }
1017
1018         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash1");
1019         wpabuf_put_be16(msg, ATTR_R_HASH1);
1020         wpabuf_put_be16(msg, SHA256_MAC_LEN);
1021         hash = wpabuf_put(msg, SHA256_MAC_LEN);
1022         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
1023         addr[0] = wps->snonce;
1024         len[0] = WPS_SECRET_NONCE_LEN;
1025         addr[1] = wps->psk1;
1026         len[1] = WPS_PSK_LEN;
1027         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1028         len[2] = wpabuf_len(wps->dh_pubkey_e);
1029         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1030         len[3] = wpabuf_len(wps->dh_pubkey_r);
1031         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1032         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", hash, SHA256_MAC_LEN);
1033
1034         wpa_printf(MSG_DEBUG, "WPS:  * R-Hash2");
1035         wpabuf_put_be16(msg, ATTR_R_HASH2);
1036         wpabuf_put_be16(msg, SHA256_MAC_LEN);
1037         hash = wpabuf_put(msg, SHA256_MAC_LEN);
1038         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
1039         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
1040         addr[1] = wps->psk2;
1041         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1042         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", hash, SHA256_MAC_LEN);
1043
1044         return 0;
1045 }
1046
1047
1048 static int wps_build_r_snonce1(struct wps_data *wps, struct wpabuf *msg)
1049 {
1050         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce1");
1051         wpabuf_put_be16(msg, ATTR_R_SNONCE1);
1052         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
1053         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
1054         return 0;
1055 }
1056
1057
1058 static int wps_build_r_snonce2(struct wps_data *wps, struct wpabuf *msg)
1059 {
1060         wpa_printf(MSG_DEBUG, "WPS:  * R-SNonce2");
1061         wpabuf_put_be16(msg, ATTR_R_SNONCE2);
1062         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
1063         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
1064                         WPS_SECRET_NONCE_LEN);
1065         return 0;
1066 }
1067
1068
1069 static int wps_build_cred_network_idx(struct wpabuf *msg,
1070                                       struct wps_credential *cred)
1071 {
1072         wpa_printf(MSG_DEBUG, "WPS:  * Network Index");
1073         wpabuf_put_be16(msg, ATTR_NETWORK_INDEX);
1074         wpabuf_put_be16(msg, 1);
1075         wpabuf_put_u8(msg, 1);
1076         return 0;
1077 }
1078
1079
1080 static int wps_build_cred_ssid(struct wpabuf *msg,
1081                                struct wps_credential *cred)
1082 {
1083         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
1084         wpabuf_put_be16(msg, ATTR_SSID);
1085         wpabuf_put_be16(msg, cred->ssid_len);
1086         wpabuf_put_data(msg, cred->ssid, cred->ssid_len);
1087         return 0;
1088 }
1089
1090
1091 static int wps_build_cred_auth_type(struct wpabuf *msg,
1092                                     struct wps_credential *cred)
1093 {
1094         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)",
1095                    cred->auth_type);
1096         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
1097         wpabuf_put_be16(msg, 2);
1098         wpabuf_put_be16(msg, cred->auth_type);
1099         return 0;
1100 }
1101
1102
1103 static int wps_build_cred_encr_type(struct wpabuf *msg,
1104                                     struct wps_credential *cred)
1105 {
1106         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)",
1107                    cred->encr_type);
1108         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
1109         wpabuf_put_be16(msg, 2);
1110         wpabuf_put_be16(msg, cred->encr_type);
1111         return 0;
1112 }
1113
1114
1115 static int wps_build_cred_network_key(struct wpabuf *msg,
1116                                       struct wps_credential *cred)
1117 {
1118         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
1119         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
1120         wpabuf_put_be16(msg, cred->key_len);
1121         wpabuf_put_data(msg, cred->key, cred->key_len);
1122         return 0;
1123 }
1124
1125
1126 static int wps_build_cred_mac_addr(struct wpabuf *msg,
1127                                    struct wps_credential *cred)
1128 {
1129         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (" MACSTR ")",
1130                    MAC2STR(cred->mac_addr));
1131         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
1132         wpabuf_put_be16(msg, ETH_ALEN);
1133         wpabuf_put_data(msg, cred->mac_addr, ETH_ALEN);
1134         return 0;
1135 }
1136
1137
1138 static int wps_build_credential(struct wpabuf *msg,
1139                                 struct wps_credential *cred)
1140 {
1141         if (wps_build_cred_network_idx(msg, cred) ||
1142             wps_build_cred_ssid(msg, cred) ||
1143             wps_build_cred_auth_type(msg, cred) ||
1144             wps_build_cred_encr_type(msg, cred) ||
1145             wps_build_cred_network_key(msg, cred) ||
1146             wps_build_cred_mac_addr(msg, cred))
1147                 return -1;
1148         return 0;
1149 }
1150
1151
1152 int wps_build_cred(struct wps_data *wps, struct wpabuf *msg)
1153 {
1154         struct wpabuf *cred;
1155
1156         if (wps->wps->registrar->skip_cred_build)
1157                 goto skip_cred_build;
1158
1159         wpa_printf(MSG_DEBUG, "WPS:  * Credential");
1160         os_memset(&wps->cred, 0, sizeof(wps->cred));
1161
1162         os_memcpy(wps->cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
1163         wps->cred.ssid_len = wps->wps->ssid_len;
1164
1165         /* Select the best authentication and encryption type */
1166         if (wps->auth_type & WPS_AUTH_WPA2PSK)
1167                 wps->auth_type = WPS_AUTH_WPA2PSK;
1168         else if (wps->auth_type & WPS_AUTH_WPAPSK)
1169                 wps->auth_type = WPS_AUTH_WPAPSK;
1170         else if (wps->auth_type & WPS_AUTH_OPEN)
1171                 wps->auth_type = WPS_AUTH_OPEN;
1172         else if (wps->auth_type & WPS_AUTH_SHARED)
1173                 wps->auth_type = WPS_AUTH_SHARED;
1174         else {
1175                 wpa_printf(MSG_DEBUG, "WPS: Unsupported auth_type 0x%x",
1176                            wps->auth_type);
1177                 return -1;
1178         }
1179         wps->cred.auth_type = wps->auth_type;
1180
1181         if (wps->auth_type == WPS_AUTH_WPA2PSK ||
1182             wps->auth_type == WPS_AUTH_WPAPSK) {
1183                 if (wps->encr_type & WPS_ENCR_AES)
1184                         wps->encr_type = WPS_ENCR_AES;
1185                 else if (wps->encr_type & WPS_ENCR_TKIP)
1186                         wps->encr_type = WPS_ENCR_TKIP;
1187                 else {
1188                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
1189                                    "type for WPA/WPA2");
1190                         return -1;
1191                 }
1192         } else {
1193                 if (wps->encr_type & WPS_ENCR_WEP)
1194                         wps->encr_type = WPS_ENCR_WEP;
1195                 else if (wps->encr_type & WPS_ENCR_NONE)
1196                         wps->encr_type = WPS_ENCR_NONE;
1197                 else {
1198                         wpa_printf(MSG_DEBUG, "WPS: No suitable encryption "
1199                                    "type for non-WPA/WPA2 mode");
1200                         return -1;
1201                 }
1202         }
1203         wps->cred.encr_type = wps->encr_type;
1204         /* Set MAC address in the Credential to be the AP's address (BSSID) */
1205         os_memcpy(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN);
1206
1207         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->wps->ap &&
1208             !wps->wps->registrar->disable_auto_conf) {
1209                 u8 r[16];
1210                 /* Generate a random passphrase */
1211                 if (os_get_random(r, sizeof(r)) < 0)
1212                         return -1;
1213                 os_free(wps->new_psk);
1214                 wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
1215                 if (wps->new_psk == NULL)
1216                         return -1;
1217                 wps->new_psk_len--; /* remove newline */
1218                 while (wps->new_psk_len &&
1219                        wps->new_psk[wps->new_psk_len - 1] == '=')
1220                         wps->new_psk_len--;
1221                 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Generated passphrase",
1222                                       wps->new_psk, wps->new_psk_len);
1223                 os_memcpy(wps->cred.key, wps->new_psk, wps->new_psk_len);
1224                 wps->cred.key_len = wps->new_psk_len;
1225         } else if (wps->wps->network_key) {
1226                 os_memcpy(wps->cred.key, wps->wps->network_key,
1227                           wps->wps->network_key_len);
1228                 wps->cred.key_len = wps->wps->network_key_len;
1229         } else if (wps->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) {
1230                 char hex[65];
1231                 /* Generate a random per-device PSK */
1232                 os_free(wps->new_psk);
1233                 wps->new_psk_len = 32;
1234                 wps->new_psk = os_malloc(wps->new_psk_len);
1235                 if (wps->new_psk == NULL)
1236                         return -1;
1237                 if (os_get_random(wps->new_psk, wps->new_psk_len) < 0) {
1238                         os_free(wps->new_psk);
1239                         wps->new_psk = NULL;
1240                         return -1;
1241                 }
1242                 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
1243                                 wps->new_psk, wps->new_psk_len);
1244                 wpa_snprintf_hex(hex, sizeof(hex), wps->new_psk,
1245                                  wps->new_psk_len);
1246                 os_memcpy(wps->cred.key, hex, wps->new_psk_len * 2);
1247                 wps->cred.key_len = wps->new_psk_len * 2;
1248         }
1249
1250         cred = wpabuf_alloc(200);
1251         if (cred == NULL)
1252                 return -1;
1253
1254         if (wps_build_credential(cred, &wps->cred)) {
1255                 wpabuf_free(cred);
1256                 return -1;
1257         }
1258
1259         wpabuf_put_be16(msg, ATTR_CRED);
1260         wpabuf_put_be16(msg, wpabuf_len(cred));
1261         wpabuf_put_buf(msg, cred);
1262         wpabuf_free(cred);
1263
1264 skip_cred_build:
1265         if (wps->wps->registrar->extra_cred) {
1266                 wpa_printf(MSG_DEBUG, "WPS:  * Credential (pre-configured)");
1267                 wpabuf_put_buf(msg, wps->wps->registrar->extra_cred);
1268         }
1269
1270         return 0;
1271 }
1272
1273
1274 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *msg)
1275 {
1276         wpa_printf(MSG_DEBUG, "WPS:  * AP Settings");
1277
1278         if (wps_build_credential(msg, &wps->cred))
1279                 return -1;
1280
1281         return 0;
1282 }
1283
1284
1285 static struct wpabuf * wps_build_m2(struct wps_data *wps)
1286 {
1287         struct wpabuf *msg;
1288
1289         if (os_get_random(wps->nonce_r, WPS_NONCE_LEN) < 0)
1290                 return NULL;
1291         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
1292                     wps->nonce_r, WPS_NONCE_LEN);
1293         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
1294
1295         wpa_printf(MSG_DEBUG, "WPS: Building Message M2");
1296         msg = wpabuf_alloc(1000);
1297         if (msg == NULL)
1298                 return NULL;
1299
1300         if (wps_build_version(msg) ||
1301             wps_build_msg_type(msg, WPS_M2) ||
1302             wps_build_enrollee_nonce(wps, msg) ||
1303             wps_build_registrar_nonce(wps, msg) ||
1304             wps_build_uuid_r(wps, msg) ||
1305             wps_build_public_key(wps, msg) ||
1306             wps_derive_keys(wps) ||
1307             wps_build_auth_type_flags(wps, msg) ||
1308             wps_build_encr_type_flags(wps, msg) ||
1309             wps_build_conn_type_flags(wps, msg) ||
1310             wps_build_config_methods_r(wps->wps->registrar, msg) ||
1311             wps_build_device_attrs(&wps->wps->dev, msg) ||
1312             wps_build_rf_bands(&wps->wps->dev, msg) ||
1313             wps_build_assoc_state(wps, msg) ||
1314             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
1315             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
1316             wps_build_os_version(&wps->wps->dev, msg) ||
1317             wps_build_authenticator(wps, msg)) {
1318                 wpabuf_free(msg);
1319                 return NULL;
1320         }
1321
1322         wps->state = RECV_M3;
1323         return msg;
1324 }
1325
1326
1327 static struct wpabuf * wps_build_m2d(struct wps_data *wps)
1328 {
1329         struct wpabuf *msg;
1330         u16 err = wps->config_error;
1331
1332         wpa_printf(MSG_DEBUG, "WPS: Building Message M2D");
1333         msg = wpabuf_alloc(1000);
1334         if (msg == NULL)
1335                 return NULL;
1336
1337         if (wps->wps->ap && wps->wps->ap_setup_locked &&
1338             err == WPS_CFG_NO_ERROR)
1339                 err = WPS_CFG_SETUP_LOCKED;
1340
1341         if (wps_build_version(msg) ||
1342             wps_build_msg_type(msg, WPS_M2D) ||
1343             wps_build_enrollee_nonce(wps, msg) ||
1344             wps_build_registrar_nonce(wps, msg) ||
1345             wps_build_uuid_r(wps, msg) ||
1346             wps_build_auth_type_flags(wps, msg) ||
1347             wps_build_encr_type_flags(wps, msg) ||
1348             wps_build_conn_type_flags(wps, msg) ||
1349             wps_build_config_methods_r(wps->wps->registrar, msg) ||
1350             wps_build_device_attrs(&wps->wps->dev, msg) ||
1351             wps_build_rf_bands(&wps->wps->dev, msg) ||
1352             wps_build_assoc_state(wps, msg) ||
1353             wps_build_config_error(msg, err) ||
1354             wps_build_os_version(&wps->wps->dev, msg)) {
1355                 wpabuf_free(msg);
1356                 return NULL;
1357         }
1358
1359         wps->state = RECV_M2D_ACK;
1360         return msg;
1361 }
1362
1363
1364 static struct wpabuf * wps_build_m4(struct wps_data *wps)
1365 {
1366         struct wpabuf *msg, *plain;
1367
1368         wpa_printf(MSG_DEBUG, "WPS: Building Message M4");
1369
1370         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
1371
1372         plain = wpabuf_alloc(200);
1373         if (plain == NULL)
1374                 return NULL;
1375
1376         msg = wpabuf_alloc(1000);
1377         if (msg == NULL) {
1378                 wpabuf_free(plain);
1379                 return NULL;
1380         }
1381
1382         if (wps_build_version(msg) ||
1383             wps_build_msg_type(msg, WPS_M4) ||
1384             wps_build_enrollee_nonce(wps, msg) ||
1385             wps_build_r_hash(wps, msg) ||
1386             wps_build_r_snonce1(wps, plain) ||
1387             wps_build_key_wrap_auth(wps, plain) ||
1388             wps_build_encr_settings(wps, msg, plain) ||
1389             wps_build_authenticator(wps, msg)) {
1390                 wpabuf_free(plain);
1391                 wpabuf_free(msg);
1392                 return NULL;
1393         }
1394         wpabuf_free(plain);
1395
1396         wps->state = RECV_M5;
1397         return msg;
1398 }
1399
1400
1401 static struct wpabuf * wps_build_m6(struct wps_data *wps)
1402 {
1403         struct wpabuf *msg, *plain;
1404
1405         wpa_printf(MSG_DEBUG, "WPS: Building Message M6");
1406
1407         plain = wpabuf_alloc(200);
1408         if (plain == NULL)
1409                 return NULL;
1410
1411         msg = wpabuf_alloc(1000);
1412         if (msg == NULL) {
1413                 wpabuf_free(plain);
1414                 return NULL;
1415         }
1416
1417         if (wps_build_version(msg) ||
1418             wps_build_msg_type(msg, WPS_M6) ||
1419             wps_build_enrollee_nonce(wps, msg) ||
1420             wps_build_r_snonce2(wps, plain) ||
1421             wps_build_key_wrap_auth(wps, plain) ||
1422             wps_build_encr_settings(wps, msg, plain) ||
1423             wps_build_authenticator(wps, msg)) {
1424                 wpabuf_free(plain);
1425                 wpabuf_free(msg);
1426                 return NULL;
1427         }
1428         wpabuf_free(plain);
1429
1430         wps->wps_pin_revealed = 1;
1431         wps->state = RECV_M7;
1432         return msg;
1433 }
1434
1435
1436 static struct wpabuf * wps_build_m8(struct wps_data *wps)
1437 {
1438         struct wpabuf *msg, *plain;
1439
1440         wpa_printf(MSG_DEBUG, "WPS: Building Message M8");
1441
1442         plain = wpabuf_alloc(500);
1443         if (plain == NULL)
1444                 return NULL;
1445
1446         msg = wpabuf_alloc(1000);
1447         if (msg == NULL) {
1448                 wpabuf_free(plain);
1449                 return NULL;
1450         }
1451
1452         if (wps_build_version(msg) ||
1453             wps_build_msg_type(msg, WPS_M8) ||
1454             wps_build_enrollee_nonce(wps, msg) ||
1455             (wps->wps->ap && wps_build_cred(wps, plain)) ||
1456             (!wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
1457             wps_build_key_wrap_auth(wps, plain) ||
1458             wps_build_encr_settings(wps, msg, plain) ||
1459             wps_build_authenticator(wps, msg)) {
1460                 wpabuf_free(plain);
1461                 wpabuf_free(msg);
1462                 return NULL;
1463         }
1464         wpabuf_free(plain);
1465
1466         wps->state = RECV_DONE;
1467         return msg;
1468 }
1469
1470
1471 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
1472 {
1473         struct wpabuf *msg;
1474
1475         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
1476
1477         msg = wpabuf_alloc(1000);
1478         if (msg == NULL)
1479                 return NULL;
1480
1481         if (wps_build_version(msg) ||
1482             wps_build_msg_type(msg, WPS_WSC_ACK) ||
1483             wps_build_enrollee_nonce(wps, msg) ||
1484             wps_build_registrar_nonce(wps, msg)) {
1485                 wpabuf_free(msg);
1486                 return NULL;
1487         }
1488
1489         return msg;
1490 }
1491
1492
1493 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
1494 {
1495         struct wpabuf *msg;
1496
1497         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
1498
1499         msg = wpabuf_alloc(1000);
1500         if (msg == NULL)
1501                 return NULL;
1502
1503         if (wps_build_version(msg) ||
1504             wps_build_msg_type(msg, WPS_WSC_NACK) ||
1505             wps_build_enrollee_nonce(wps, msg) ||
1506             wps_build_registrar_nonce(wps, msg) ||
1507             wps_build_config_error(msg, wps->config_error)) {
1508                 wpabuf_free(msg);
1509                 return NULL;
1510         }
1511
1512         return msg;
1513 }
1514
1515
1516 struct wpabuf * wps_registrar_get_msg(struct wps_data *wps,
1517                                       enum wsc_op_code *op_code)
1518 {
1519         struct wpabuf *msg;
1520
1521 #ifdef CONFIG_WPS_UPNP
1522         if (wps->wps->wps_upnp) {
1523                 struct upnp_pending_message *p, *prev = NULL;
1524                 if (wps->ext_reg > 1)
1525                         wps_registrar_free_pending_m2(wps->wps);
1526                 p = wps->wps->upnp_msgs;
1527                 /* TODO: check pending message MAC address */
1528                 while (p && p->next) {
1529                         prev = p;
1530                         p = p->next;
1531                 }
1532                 if (p) {
1533                         wpa_printf(MSG_DEBUG, "WPS: Use pending message from "
1534                                    "UPnP");
1535                         if (prev)
1536                                 prev->next = NULL;
1537                         else
1538                                 wps->wps->upnp_msgs = NULL;
1539                         msg = p->msg;
1540                         os_free(p);
1541                         *op_code = WSC_MSG;
1542                         if (wps->ext_reg == 0)
1543                                 wps->ext_reg = 1;
1544                         return msg;
1545                 }
1546         }
1547         if (wps->ext_reg) {
1548                 wpa_printf(MSG_DEBUG, "WPS: Using external Registrar, but no "
1549                            "pending message available");
1550                 return NULL;
1551         }
1552 #endif /* CONFIG_WPS_UPNP */
1553
1554         switch (wps->state) {
1555         case SEND_M2:
1556                 if (wps_get_dev_password(wps) < 0)
1557                         msg = wps_build_m2d(wps);
1558                 else
1559                         msg = wps_build_m2(wps);
1560                 *op_code = WSC_MSG;
1561                 break;
1562         case SEND_M2D:
1563                 msg = wps_build_m2d(wps);
1564                 *op_code = WSC_MSG;
1565                 break;
1566         case SEND_M4:
1567                 msg = wps_build_m4(wps);
1568                 *op_code = WSC_MSG;
1569                 break;
1570         case SEND_M6:
1571                 msg = wps_build_m6(wps);
1572                 *op_code = WSC_MSG;
1573                 break;
1574         case SEND_M8:
1575                 msg = wps_build_m8(wps);
1576                 *op_code = WSC_MSG;
1577                 break;
1578         case RECV_DONE:
1579                 msg = wps_build_wsc_ack(wps);
1580                 *op_code = WSC_ACK;
1581                 break;
1582         case SEND_WSC_NACK:
1583                 msg = wps_build_wsc_nack(wps);
1584                 *op_code = WSC_NACK;
1585                 break;
1586         default:
1587                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
1588                            "a message", wps->state);
1589                 msg = NULL;
1590                 break;
1591         }
1592
1593         if (*op_code == WSC_MSG && msg) {
1594                 /* Save a copy of the last message for Authenticator derivation
1595                  */
1596                 wpabuf_free(wps->last_msg);
1597                 wps->last_msg = wpabuf_dup(msg);
1598         }
1599
1600         return msg;
1601 }
1602
1603
1604 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
1605 {
1606         if (e_nonce == NULL) {
1607                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
1608                 return -1;
1609         }
1610
1611         os_memcpy(wps->nonce_e, e_nonce, WPS_NONCE_LEN);
1612         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
1613                     wps->nonce_e, WPS_NONCE_LEN);
1614
1615         return 0;
1616 }
1617
1618
1619 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
1620 {
1621         if (r_nonce == NULL) {
1622                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
1623                 return -1;
1624         }
1625
1626         if (os_memcmp(wps->nonce_r, r_nonce, WPS_NONCE_LEN) != 0) {
1627                 wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce received");
1628                 return -1;
1629         }
1630
1631         return 0;
1632 }
1633
1634
1635 static int wps_process_uuid_e(struct wps_data *wps, const u8 *uuid_e)
1636 {
1637         if (uuid_e == NULL) {
1638                 wpa_printf(MSG_DEBUG, "WPS: No UUID-E received");
1639                 return -1;
1640         }
1641
1642         os_memcpy(wps->uuid_e, uuid_e, WPS_UUID_LEN);
1643         wpa_hexdump(MSG_DEBUG, "WPS: UUID-E", wps->uuid_e, WPS_UUID_LEN);
1644
1645         return 0;
1646 }
1647
1648
1649 static int wps_process_dev_password_id(struct wps_data *wps, const u8 *pw_id)
1650 {
1651         if (pw_id == NULL) {
1652                 wpa_printf(MSG_DEBUG, "WPS: No Device Password ID received");
1653                 return -1;
1654         }
1655
1656         wps->dev_pw_id = WPA_GET_BE16(pw_id);
1657         wpa_printf(MSG_DEBUG, "WPS: Device Password ID %d", wps->dev_pw_id);
1658
1659         return 0;
1660 }
1661
1662
1663 static int wps_process_e_hash1(struct wps_data *wps, const u8 *e_hash1)
1664 {
1665         if (e_hash1 == NULL) {
1666                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash1 received");
1667                 return -1;
1668         }
1669
1670         os_memcpy(wps->peer_hash1, e_hash1, WPS_HASH_LEN);
1671         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", wps->peer_hash1, WPS_HASH_LEN);
1672
1673         return 0;
1674 }
1675
1676
1677 static int wps_process_e_hash2(struct wps_data *wps, const u8 *e_hash2)
1678 {
1679         if (e_hash2 == NULL) {
1680                 wpa_printf(MSG_DEBUG, "WPS: No E-Hash2 received");
1681                 return -1;
1682         }
1683
1684         os_memcpy(wps->peer_hash2, e_hash2, WPS_HASH_LEN);
1685         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", wps->peer_hash2, WPS_HASH_LEN);
1686
1687         return 0;
1688 }
1689
1690
1691 static int wps_process_e_snonce1(struct wps_data *wps, const u8 *e_snonce1)
1692 {
1693         u8 hash[SHA256_MAC_LEN];
1694         const u8 *addr[4];
1695         size_t len[4];
1696
1697         if (e_snonce1 == NULL) {
1698                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce1 received");
1699                 return -1;
1700         }
1701
1702         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce1", e_snonce1,
1703                         WPS_SECRET_NONCE_LEN);
1704
1705         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
1706         addr[0] = e_snonce1;
1707         len[0] = WPS_SECRET_NONCE_LEN;
1708         addr[1] = wps->psk1;
1709         len[1] = WPS_PSK_LEN;
1710         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1711         len[2] = wpabuf_len(wps->dh_pubkey_e);
1712         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1713         len[3] = wpabuf_len(wps->dh_pubkey_r);
1714         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1715
1716         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
1717                 wpa_printf(MSG_DEBUG, "WPS: E-Hash1 derived from E-S1 does "
1718                            "not match with the pre-committed value");
1719                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1720                 wps_pwd_auth_fail_event(wps->wps, 0, 1);
1721                 return -1;
1722         }
1723
1724         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the first "
1725                    "half of the device password");
1726
1727         return 0;
1728 }
1729
1730
1731 static int wps_process_e_snonce2(struct wps_data *wps, const u8 *e_snonce2)
1732 {
1733         u8 hash[SHA256_MAC_LEN];
1734         const u8 *addr[4];
1735         size_t len[4];
1736
1737         if (e_snonce2 == NULL) {
1738                 wpa_printf(MSG_DEBUG, "WPS: No E-SNonce2 received");
1739                 return -1;
1740         }
1741
1742         wpa_hexdump_key(MSG_DEBUG, "WPS: E-SNonce2", e_snonce2,
1743                         WPS_SECRET_NONCE_LEN);
1744
1745         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
1746         addr[0] = e_snonce2;
1747         len[0] = WPS_SECRET_NONCE_LEN;
1748         addr[1] = wps->psk2;
1749         len[1] = WPS_PSK_LEN;
1750         addr[2] = wpabuf_head(wps->dh_pubkey_e);
1751         len[2] = wpabuf_len(wps->dh_pubkey_e);
1752         addr[3] = wpabuf_head(wps->dh_pubkey_r);
1753         len[3] = wpabuf_len(wps->dh_pubkey_r);
1754         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
1755
1756         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
1757                 wpa_printf(MSG_DEBUG, "WPS: E-Hash2 derived from E-S2 does "
1758                            "not match with the pre-committed value");
1759                 wps_registrar_invalidate_pin(wps->wps->registrar, wps->uuid_e);
1760                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
1761                 wps_pwd_auth_fail_event(wps->wps, 0, 2);
1762                 return -1;
1763         }
1764
1765         wpa_printf(MSG_DEBUG, "WPS: Enrollee proved knowledge of the second "
1766                    "half of the device password");
1767         wps->wps_pin_revealed = 0;
1768         wps_registrar_unlock_pin(wps->wps->registrar, wps->uuid_e);
1769
1770         return 0;
1771 }
1772
1773
1774 static int wps_process_mac_addr(struct wps_data *wps, const u8 *mac_addr)
1775 {
1776         if (mac_addr == NULL) {
1777                 wpa_printf(MSG_DEBUG, "WPS: No MAC Address received");
1778                 return -1;
1779         }
1780
1781         wpa_printf(MSG_DEBUG, "WPS: Enrollee MAC Address " MACSTR,
1782                    MAC2STR(mac_addr));
1783         os_memcpy(wps->mac_addr_e, mac_addr, ETH_ALEN);
1784         os_memcpy(wps->peer_dev.mac_addr, mac_addr, ETH_ALEN);
1785
1786         return 0;
1787 }
1788
1789
1790 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
1791                               size_t pk_len)
1792 {
1793         if (pk == NULL || pk_len == 0) {
1794                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
1795                 return -1;
1796         }
1797
1798 #ifdef CONFIG_WPS_OOB
1799         if (wps->wps->oob_conf.pubkey_hash != NULL) {
1800                 const u8 *addr[1];
1801                 u8 hash[WPS_HASH_LEN];
1802
1803                 addr[0] = pk;
1804                 sha256_vector(1, addr, &pk_len, hash);
1805                 if (os_memcmp(hash,
1806                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
1807                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
1808                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
1809                         return -1;
1810                 }
1811         }
1812 #endif /* CONFIG_WPS_OOB */
1813
1814         wpabuf_free(wps->dh_pubkey_e);
1815         wps->dh_pubkey_e = wpabuf_alloc_copy(pk, pk_len);
1816         if (wps->dh_pubkey_e == NULL)
1817                 return -1;
1818
1819         return 0;
1820 }
1821
1822
1823 static int wps_process_auth_type_flags(struct wps_data *wps, const u8 *auth)
1824 {
1825         u16 auth_types;
1826
1827         if (auth == NULL) {
1828                 wpa_printf(MSG_DEBUG, "WPS: No Authentication Type flags "
1829                            "received");
1830                 return -1;
1831         }
1832
1833         auth_types = WPA_GET_BE16(auth);
1834
1835         wpa_printf(MSG_DEBUG, "WPS: Enrollee Authentication Type flags 0x%x",
1836                    auth_types);
1837         wps->auth_type = wps->wps->auth_types & auth_types;
1838         if (wps->auth_type == 0) {
1839                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1840                            "authentication types (own 0x%x Enrollee 0x%x)",
1841                            wps->wps->auth_types, auth_types);
1842 #ifdef WPS_WORKAROUNDS
1843                 /*
1844                  * Some deployed implementations seem to advertise incorrect
1845                  * information in this attribute. For example, Linksys WRT350N
1846                  * seems to have a byteorder bug that breaks this negotiation.
1847                  * In order to interoperate with existing implementations,
1848                  * assume that the Enrollee supports everything we do.
1849                  */
1850                 wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
1851                            "does not advertise supported authentication types "
1852                            "correctly");
1853                 wps->auth_type = wps->wps->auth_types;
1854 #else /* WPS_WORKAROUNDS */
1855                 return -1;
1856 #endif /* WPS_WORKAROUNDS */
1857         }
1858
1859         return 0;
1860 }
1861
1862
1863 static int wps_process_encr_type_flags(struct wps_data *wps, const u8 *encr)
1864 {
1865         u16 encr_types;
1866
1867         if (encr == NULL) {
1868                 wpa_printf(MSG_DEBUG, "WPS: No Encryption Type flags "
1869                            "received");
1870                 return -1;
1871         }
1872
1873         encr_types = WPA_GET_BE16(encr);
1874
1875         wpa_printf(MSG_DEBUG, "WPS: Enrollee Encryption Type flags 0x%x",
1876                    encr_types);
1877         wps->encr_type = wps->wps->encr_types & encr_types;
1878         if (wps->encr_type == 0) {
1879                 wpa_printf(MSG_DEBUG, "WPS: No match in supported "
1880                            "encryption types (own 0x%x Enrollee 0x%x)",
1881                            wps->wps->encr_types, encr_types);
1882 #ifdef WPS_WORKAROUNDS
1883                 /*
1884                  * Some deployed implementations seem to advertise incorrect
1885                  * information in this attribute. For example, Linksys WRT350N
1886                  * seems to have a byteorder bug that breaks this negotiation.
1887                  * In order to interoperate with existing implementations,
1888                  * assume that the Enrollee supports everything we do.
1889                  */
1890                 wpa_printf(MSG_DEBUG, "WPS: Workaround - assume Enrollee "
1891                            "does not advertise supported encryption types "
1892                            "correctly");
1893                 wps->encr_type = wps->wps->encr_types;
1894 #else /* WPS_WORKAROUNDS */
1895                 return -1;
1896 #endif /* WPS_WORKAROUNDS */
1897         }
1898
1899         return 0;
1900 }
1901
1902
1903 static int wps_process_conn_type_flags(struct wps_data *wps, const u8 *conn)
1904 {
1905         if (conn == NULL) {
1906                 wpa_printf(MSG_DEBUG, "WPS: No Connection Type flags "
1907                            "received");
1908                 return -1;
1909         }
1910
1911         wpa_printf(MSG_DEBUG, "WPS: Enrollee Connection Type flags 0x%x",
1912                    *conn);
1913
1914         return 0;
1915 }
1916
1917
1918 static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
1919 {
1920         u16 m;
1921
1922         if (methods == NULL) {
1923                 wpa_printf(MSG_DEBUG, "WPS: No Config Methods received");
1924                 return -1;
1925         }
1926
1927         m = WPA_GET_BE16(methods);
1928
1929         wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
1930
1931         return 0;
1932 }
1933
1934
1935 static int wps_process_wps_state(struct wps_data *wps, const u8 *state)
1936 {
1937         if (state == NULL) {
1938                 wpa_printf(MSG_DEBUG, "WPS: No Wi-Fi Protected Setup State "
1939                            "received");
1940                 return -1;
1941         }
1942
1943         wpa_printf(MSG_DEBUG, "WPS: Enrollee Wi-Fi Protected Setup State %d",
1944                    *state);
1945
1946         return 0;
1947 }
1948
1949
1950 static int wps_process_assoc_state(struct wps_data *wps, const u8 *assoc)
1951 {
1952         u16 a;
1953
1954         if (assoc == NULL) {
1955                 wpa_printf(MSG_DEBUG, "WPS: No Association State received");
1956                 return -1;
1957         }
1958
1959         a = WPA_GET_BE16(assoc);
1960         wpa_printf(MSG_DEBUG, "WPS: Enrollee Association State %d", a);
1961
1962         return 0;
1963 }
1964
1965
1966 static int wps_process_config_error(struct wps_data *wps, const u8 *err)
1967 {
1968         u16 e;
1969
1970         if (err == NULL) {
1971                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error received");
1972                 return -1;
1973         }
1974
1975         e = WPA_GET_BE16(err);
1976         wpa_printf(MSG_DEBUG, "WPS: Enrollee Configuration Error %d", e);
1977
1978         return 0;
1979 }
1980
1981
1982 static enum wps_process_res wps_process_m1(struct wps_data *wps,
1983                                            struct wps_parse_attr *attr)
1984 {
1985         wpa_printf(MSG_DEBUG, "WPS: Received M1");
1986
1987         if (wps->state != RECV_M1) {
1988                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1989                            "receiving M1", wps->state);
1990                 return WPS_FAILURE;
1991         }
1992
1993         if (wps_process_uuid_e(wps, attr->uuid_e) ||
1994             wps_process_mac_addr(wps, attr->mac_addr) ||
1995             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1996             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
1997             wps_process_auth_type_flags(wps, attr->auth_type_flags) ||
1998             wps_process_encr_type_flags(wps, attr->encr_type_flags) ||
1999             wps_process_conn_type_flags(wps, attr->conn_type_flags) ||
2000             wps_process_config_methods(wps, attr->config_methods) ||
2001             wps_process_wps_state(wps, attr->wps_state) ||
2002             wps_process_device_attrs(&wps->peer_dev, attr) ||
2003             wps_process_rf_bands(&wps->peer_dev, attr->rf_bands) ||
2004             wps_process_assoc_state(wps, attr->assoc_state) ||
2005             wps_process_dev_password_id(wps, attr->dev_password_id) ||
2006             wps_process_config_error(wps, attr->config_error) ||
2007             wps_process_os_version(&wps->peer_dev, attr->os_version))
2008                 return WPS_FAILURE;
2009
2010         if (wps->dev_pw_id < 0x10 &&
2011             wps->dev_pw_id != DEV_PW_DEFAULT &&
2012             wps->dev_pw_id != DEV_PW_USER_SPECIFIED &&
2013             wps->dev_pw_id != DEV_PW_MACHINE_SPECIFIED &&
2014             wps->dev_pw_id != DEV_PW_REGISTRAR_SPECIFIED &&
2015             (wps->dev_pw_id != DEV_PW_PUSHBUTTON ||
2016              !wps->wps->registrar->pbc)) {
2017                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Device Password ID %d",
2018                            wps->dev_pw_id);
2019                 wps->state = SEND_M2D;
2020                 return WPS_CONTINUE;
2021         }
2022
2023 #ifdef CONFIG_WPS_OOB
2024         if (wps->dev_pw_id >= 0x10 &&
2025             wps->dev_pw_id != wps->wps->oob_dev_pw_id) {
2026                 wpa_printf(MSG_DEBUG, "WPS: OOB Device Password ID "
2027                            "%d mismatch", wps->dev_pw_id);
2028                 wps->state = SEND_M2D;
2029                 return WPS_CONTINUE;
2030         }
2031 #endif /* CONFIG_WPS_OOB */
2032
2033         if (wps->dev_pw_id == DEV_PW_PUSHBUTTON) {
2034                 if (wps->wps->registrar->force_pbc_overlap ||
2035                     wps_registrar_pbc_overlap(wps->wps->registrar,
2036                                               wps->mac_addr_e, wps->uuid_e)) {
2037                         wpa_printf(MSG_DEBUG, "WPS: PBC overlap - deny PBC "
2038                                    "negotiation");
2039                         wps->state = SEND_M2D;
2040                         wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2041                         wps_pbc_overlap_event(wps->wps);
2042                         wps->wps->registrar->force_pbc_overlap = 1;
2043                         return WPS_CONTINUE;
2044                 }
2045                 wps_registrar_add_pbc_session(wps->wps->registrar,
2046                                               wps->mac_addr_e, wps->uuid_e);
2047                 wps->pbc = 1;
2048         }
2049
2050         wps->state = SEND_M2;
2051         return WPS_CONTINUE;
2052 }
2053
2054
2055 static enum wps_process_res wps_process_m3(struct wps_data *wps,
2056                                            const struct wpabuf *msg,
2057                                            struct wps_parse_attr *attr)
2058 {
2059         wpa_printf(MSG_DEBUG, "WPS: Received M3");
2060
2061         if (wps->state != RECV_M3) {
2062                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2063                            "receiving M3", wps->state);
2064                 wps->state = SEND_WSC_NACK;
2065                 return WPS_CONTINUE;
2066         }
2067
2068         if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
2069                 wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
2070                            "session overlap");
2071                 wps->state = SEND_WSC_NACK;
2072                 wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2073                 return WPS_CONTINUE;
2074         }
2075
2076         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
2077             wps_process_authenticator(wps, attr->authenticator, msg) ||
2078             wps_process_e_hash1(wps, attr->e_hash1) ||
2079             wps_process_e_hash2(wps, attr->e_hash2)) {
2080                 wps->state = SEND_WSC_NACK;
2081                 return WPS_CONTINUE;
2082         }
2083
2084         wps->state = SEND_M4;
2085         return WPS_CONTINUE;
2086 }
2087
2088
2089 static enum wps_process_res wps_process_m5(struct wps_data *wps,
2090                                            const struct wpabuf *msg,
2091                                            struct wps_parse_attr *attr)
2092 {
2093         struct wpabuf *decrypted;
2094         struct wps_parse_attr eattr;
2095
2096         wpa_printf(MSG_DEBUG, "WPS: Received M5");
2097
2098         if (wps->state != RECV_M5) {
2099                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2100                            "receiving M5", wps->state);
2101                 wps->state = SEND_WSC_NACK;
2102                 return WPS_CONTINUE;
2103         }
2104
2105         if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
2106                 wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
2107                            "session overlap");
2108                 wps->state = SEND_WSC_NACK;
2109                 wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2110                 return WPS_CONTINUE;
2111         }
2112
2113         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
2114             wps_process_authenticator(wps, attr->authenticator, msg)) {
2115                 wps->state = SEND_WSC_NACK;
2116                 return WPS_CONTINUE;
2117         }
2118
2119         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
2120                                               attr->encr_settings_len);
2121         if (decrypted == NULL) {
2122                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
2123                            "Settings attribute");
2124                 wps->state = SEND_WSC_NACK;
2125                 return WPS_CONTINUE;
2126         }
2127
2128         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
2129                    "attribute");
2130         if (wps_parse_msg(decrypted, &eattr) < 0 ||
2131             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
2132             wps_process_e_snonce1(wps, eattr.e_snonce1)) {
2133                 wpabuf_free(decrypted);
2134                 wps->state = SEND_WSC_NACK;
2135                 return WPS_CONTINUE;
2136         }
2137         wpabuf_free(decrypted);
2138
2139         wps->state = SEND_M6;
2140         return WPS_CONTINUE;
2141 }
2142
2143
2144 static void wps_sta_cred_cb(struct wps_data *wps)
2145 {
2146         /*
2147          * Update credential to only include a single authentication and
2148          * encryption type in case the AP configuration includes more than one
2149          * option.
2150          */
2151         if (wps->cred.auth_type & WPS_AUTH_WPA2PSK)
2152                 wps->cred.auth_type = WPS_AUTH_WPA2PSK;
2153         else if (wps->cred.auth_type & WPS_AUTH_WPAPSK)
2154                 wps->cred.auth_type = WPS_AUTH_WPAPSK;
2155         if (wps->cred.encr_type & WPS_ENCR_AES)
2156                 wps->cred.encr_type = WPS_ENCR_AES;
2157         else if (wps->cred.encr_type & WPS_ENCR_TKIP)
2158                 wps->cred.encr_type = WPS_ENCR_TKIP;
2159         wpa_printf(MSG_DEBUG, "WPS: Update local configuration based on the "
2160                    "AP configuration");
2161         if (wps->wps->cred_cb)
2162                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
2163 }
2164
2165
2166 static void wps_cred_update(struct wps_credential *dst,
2167                             struct wps_credential *src)
2168 {
2169         os_memcpy(dst->ssid, src->ssid, sizeof(dst->ssid));
2170         dst->ssid_len = src->ssid_len;
2171         dst->auth_type = src->auth_type;
2172         dst->encr_type = src->encr_type;
2173         dst->key_idx = src->key_idx;
2174         os_memcpy(dst->key, src->key, sizeof(dst->key));
2175         dst->key_len = src->key_len;
2176 }
2177
2178
2179 static int wps_process_ap_settings_r(struct wps_data *wps,
2180                                      struct wps_parse_attr *attr)
2181 {
2182         if (wps->wps->ap)
2183                 return 0;
2184
2185         /* AP Settings Attributes in M7 when Enrollee is an AP */
2186         if (wps_process_ap_settings(attr, &wps->cred) < 0)
2187                 return -1;
2188
2189         wpa_printf(MSG_INFO, "WPS: Received old AP configuration from AP");
2190
2191         if (wps->new_ap_settings) {
2192                 wpa_printf(MSG_INFO, "WPS: Update AP configuration based on "
2193                            "new settings");
2194                 wps_cred_update(&wps->cred, wps->new_ap_settings);
2195                 return 0;
2196         } else {
2197                 /*
2198                  * Use the AP PIN only to receive the current AP settings, not
2199                  * to reconfigure the AP.
2200                  */
2201                 wps_sta_cred_cb(wps);
2202                 return 1;
2203         }
2204 }
2205
2206
2207 static enum wps_process_res wps_process_m7(struct wps_data *wps,
2208                                            const struct wpabuf *msg,
2209                                            struct wps_parse_attr *attr)
2210 {
2211         struct wpabuf *decrypted;
2212         struct wps_parse_attr eattr;
2213
2214         wpa_printf(MSG_DEBUG, "WPS: Received M7");
2215
2216         if (wps->state != RECV_M7) {
2217                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2218                            "receiving M7", wps->state);
2219                 wps->state = SEND_WSC_NACK;
2220                 return WPS_CONTINUE;
2221         }
2222
2223         if (wps->pbc && wps->wps->registrar->force_pbc_overlap) {
2224                 wpa_printf(MSG_DEBUG, "WPS: Reject negotiation due to PBC "
2225                            "session overlap");
2226                 wps->state = SEND_WSC_NACK;
2227                 wps->config_error = WPS_CFG_MULTIPLE_PBC_DETECTED;
2228                 return WPS_CONTINUE;
2229         }
2230
2231         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
2232             wps_process_authenticator(wps, attr->authenticator, msg)) {
2233                 wps->state = SEND_WSC_NACK;
2234                 return WPS_CONTINUE;
2235         }
2236
2237         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
2238                                               attr->encr_settings_len);
2239         if (decrypted == NULL) {
2240                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
2241                            "Settings attribute");
2242                 wps->state = SEND_WSC_NACK;
2243                 return WPS_CONTINUE;
2244         }
2245
2246         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
2247                    "attribute");
2248         if (wps_parse_msg(decrypted, &eattr) < 0 ||
2249             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
2250             wps_process_e_snonce2(wps, eattr.e_snonce2) ||
2251             wps_process_ap_settings_r(wps, &eattr)) {
2252                 wpabuf_free(decrypted);
2253                 wps->state = SEND_WSC_NACK;
2254                 return WPS_CONTINUE;
2255         }
2256
2257         wpabuf_free(decrypted);
2258
2259         wps->state = SEND_M8;
2260         return WPS_CONTINUE;
2261 }
2262
2263
2264 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
2265                                                 const struct wpabuf *msg)
2266 {
2267         struct wps_parse_attr attr;
2268         enum wps_process_res ret = WPS_CONTINUE;
2269
2270         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
2271
2272         if (wps_parse_msg(msg, &attr) < 0)
2273                 return WPS_FAILURE;
2274
2275         if (!wps_version_supported(attr.version)) {
2276                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2277                            attr.version ? *attr.version : 0);
2278                 return WPS_FAILURE;
2279         }
2280
2281         if (attr.msg_type == NULL) {
2282                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2283                 return WPS_FAILURE;
2284         }
2285
2286         if (*attr.msg_type != WPS_M1 &&
2287             (attr.registrar_nonce == NULL ||
2288              os_memcmp(wps->nonce_r, attr.registrar_nonce,
2289                        WPS_NONCE_LEN != 0))) {
2290                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2291                 return WPS_FAILURE;
2292         }
2293
2294         switch (*attr.msg_type) {
2295         case WPS_M1:
2296 #ifdef CONFIG_WPS_UPNP
2297                 if (wps->wps->wps_upnp && attr.mac_addr) {
2298                         /* Remove old pending messages when starting new run */
2299                         wps_free_pending_msgs(wps->wps->upnp_msgs);
2300                         wps->wps->upnp_msgs = NULL;
2301
2302                         upnp_wps_device_send_wlan_event(
2303                                 wps->wps->wps_upnp, attr.mac_addr,
2304                                 UPNP_WPS_WLANEVENT_TYPE_EAP, msg);
2305                 }
2306 #endif /* CONFIG_WPS_UPNP */
2307                 ret = wps_process_m1(wps, &attr);
2308                 break;
2309         case WPS_M3:
2310                 ret = wps_process_m3(wps, msg, &attr);
2311                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2312                         wps_fail_event(wps->wps, WPS_M3);
2313                 break;
2314         case WPS_M5:
2315                 ret = wps_process_m5(wps, msg, &attr);
2316                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2317                         wps_fail_event(wps->wps, WPS_M5);
2318                 break;
2319         case WPS_M7:
2320                 ret = wps_process_m7(wps, msg, &attr);
2321                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
2322                         wps_fail_event(wps->wps, WPS_M7);
2323                 break;
2324         default:
2325                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
2326                            *attr.msg_type);
2327                 return WPS_FAILURE;
2328         }
2329
2330         if (ret == WPS_CONTINUE) {
2331                 /* Save a copy of the last message for Authenticator derivation
2332                  */
2333                 wpabuf_free(wps->last_msg);
2334                 wps->last_msg = wpabuf_dup(msg);
2335         }
2336
2337         return ret;
2338 }
2339
2340
2341 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
2342                                                 const struct wpabuf *msg)
2343 {
2344         struct wps_parse_attr attr;
2345
2346         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
2347
2348         if (wps_parse_msg(msg, &attr) < 0)
2349                 return WPS_FAILURE;
2350
2351         if (!wps_version_supported(attr.version)) {
2352                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2353                            attr.version ? *attr.version : 0);
2354                 return WPS_FAILURE;
2355         }
2356
2357         if (attr.msg_type == NULL) {
2358                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2359                 return WPS_FAILURE;
2360         }
2361
2362         if (*attr.msg_type != WPS_WSC_ACK) {
2363                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2364                            *attr.msg_type);
2365                 return WPS_FAILURE;
2366         }
2367
2368 #ifdef CONFIG_WPS_UPNP
2369         if (wps->wps->wps_upnp && wps->ext_reg && wps->state == RECV_M2D_ACK &&
2370             upnp_wps_subscribers(wps->wps->wps_upnp)) {
2371                 if (wps->wps->upnp_msgs)
2372                         return WPS_CONTINUE;
2373                 wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
2374                            "external Registrar");
2375                 return WPS_PENDING;
2376         }
2377 #endif /* CONFIG_WPS_UPNP */
2378
2379         if (attr.registrar_nonce == NULL ||
2380             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2381         {
2382                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2383                 return WPS_FAILURE;
2384         }
2385
2386         if (attr.enrollee_nonce == NULL ||
2387             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2388                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2389                 return WPS_FAILURE;
2390         }
2391
2392         if (wps->state == RECV_M2D_ACK) {
2393 #ifdef CONFIG_WPS_UPNP
2394                 if (wps->wps->wps_upnp &&
2395                     upnp_wps_subscribers(wps->wps->wps_upnp)) {
2396                         if (wps->wps->upnp_msgs)
2397                                 return WPS_CONTINUE;
2398                         if (wps->ext_reg == 0)
2399                                 wps->ext_reg = 1;
2400                         wpa_printf(MSG_DEBUG, "WPS: Wait for response from an "
2401                                    "external Registrar");
2402                         return WPS_PENDING;
2403                 }
2404 #endif /* CONFIG_WPS_UPNP */
2405
2406                 wpa_printf(MSG_DEBUG, "WPS: No more registrars available - "
2407                            "terminate negotiation");
2408         }
2409
2410         return WPS_FAILURE;
2411 }
2412
2413
2414 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
2415                                                  const struct wpabuf *msg)
2416 {
2417         struct wps_parse_attr attr;
2418         int old_state;
2419
2420         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
2421
2422         old_state = wps->state;
2423         wps->state = SEND_WSC_NACK;
2424
2425         if (wps_parse_msg(msg, &attr) < 0)
2426                 return WPS_FAILURE;
2427
2428         if (!wps_version_supported(attr.version)) {
2429                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2430                            attr.version ? *attr.version : 0);
2431                 return WPS_FAILURE;
2432         }
2433
2434         if (attr.msg_type == NULL) {
2435                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2436                 return WPS_FAILURE;
2437         }
2438
2439         if (*attr.msg_type != WPS_WSC_NACK) {
2440                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2441                            *attr.msg_type);
2442                 return WPS_FAILURE;
2443         }
2444
2445 #ifdef CONFIG_WPS_UPNP
2446         if (wps->wps->wps_upnp && wps->ext_reg) {
2447                 wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
2448                            "Registrar terminated by the Enrollee");
2449                 return WPS_FAILURE;
2450         }
2451 #endif /* CONFIG_WPS_UPNP */
2452
2453         if (attr.registrar_nonce == NULL ||
2454             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2455         {
2456                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2457                 return WPS_FAILURE;
2458         }
2459
2460         if (attr.enrollee_nonce == NULL ||
2461             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2462                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2463                 return WPS_FAILURE;
2464         }
2465
2466         if (attr.config_error == NULL) {
2467                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
2468                            "in WSC_NACK");
2469                 return WPS_FAILURE;
2470         }
2471
2472         wpa_printf(MSG_DEBUG, "WPS: Enrollee terminated negotiation with "
2473                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
2474
2475         switch (old_state) {
2476         case RECV_M3:
2477                 wps_fail_event(wps->wps, WPS_M2);
2478                 break;
2479         case RECV_M5:
2480                 wps_fail_event(wps->wps, WPS_M4);
2481                 break;
2482         case RECV_M7:
2483                 wps_fail_event(wps->wps, WPS_M6);
2484                 break;
2485         case RECV_DONE:
2486                 wps_fail_event(wps->wps, WPS_M8);
2487                 break;
2488         default:
2489                 break;
2490         }
2491
2492         return WPS_FAILURE;
2493 }
2494
2495
2496 static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
2497                                                  const struct wpabuf *msg)
2498 {
2499         struct wps_parse_attr attr;
2500
2501         wpa_printf(MSG_DEBUG, "WPS: Received WSC_Done");
2502
2503         if (wps->state != RECV_DONE &&
2504             (!wps->wps->wps_upnp || !wps->ext_reg)) {
2505                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
2506                            "receiving WSC_Done", wps->state);
2507                 return WPS_FAILURE;
2508         }
2509
2510         if (wps_parse_msg(msg, &attr) < 0)
2511                 return WPS_FAILURE;
2512
2513         if (!wps_version_supported(attr.version)) {
2514                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
2515                            attr.version ? *attr.version : 0);
2516                 return WPS_FAILURE;
2517         }
2518
2519         if (attr.msg_type == NULL) {
2520                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
2521                 return WPS_FAILURE;
2522         }
2523
2524         if (*attr.msg_type != WPS_WSC_DONE) {
2525                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
2526                            *attr.msg_type);
2527                 return WPS_FAILURE;
2528         }
2529
2530 #ifdef CONFIG_WPS_UPNP
2531         if (wps->wps->wps_upnp && wps->ext_reg) {
2532                 wpa_printf(MSG_DEBUG, "WPS: Negotiation using external "
2533                            "Registrar completed successfully");
2534                 wps_device_store(wps->wps->registrar, &wps->peer_dev,
2535                                  wps->uuid_e);
2536                 return WPS_DONE;
2537         }
2538 #endif /* CONFIG_WPS_UPNP */
2539
2540         if (attr.registrar_nonce == NULL ||
2541             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
2542         {
2543                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
2544                 return WPS_FAILURE;
2545         }
2546
2547         if (attr.enrollee_nonce == NULL ||
2548             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
2549                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
2550                 return WPS_FAILURE;
2551         }
2552
2553         wpa_printf(MSG_DEBUG, "WPS: Negotiation completed successfully");
2554         wps_device_store(wps->wps->registrar, &wps->peer_dev,
2555                          wps->uuid_e);
2556
2557         if (wps->wps->wps_state == WPS_STATE_NOT_CONFIGURED && wps->new_psk &&
2558             wps->wps->ap && !wps->wps->registrar->disable_auto_conf) {
2559                 struct wps_credential cred;
2560
2561                 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based "
2562                            "on first Enrollee connection");
2563
2564                 os_memset(&cred, 0, sizeof(cred));
2565                 os_memcpy(cred.ssid, wps->wps->ssid, wps->wps->ssid_len);
2566                 cred.ssid_len = wps->wps->ssid_len;
2567                 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK;
2568                 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES;
2569                 os_memcpy(cred.key, wps->new_psk, wps->new_psk_len);
2570                 cred.key_len = wps->new_psk_len;
2571
2572                 wps->wps->wps_state = WPS_STATE_CONFIGURED;
2573                 wpa_hexdump_ascii_key(MSG_DEBUG,
2574                                       "WPS: Generated random passphrase",
2575                                       wps->new_psk, wps->new_psk_len);
2576                 if (wps->wps->cred_cb)
2577                         wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
2578
2579                 os_free(wps->new_psk);
2580                 wps->new_psk = NULL;
2581         }
2582
2583         if (!wps->wps->ap)
2584                 wps_sta_cred_cb(wps);
2585
2586         if (wps->new_psk) {
2587                 if (wps_cb_new_psk(wps->wps->registrar, wps->mac_addr_e,
2588                                    wps->new_psk, wps->new_psk_len)) {
2589                         wpa_printf(MSG_DEBUG, "WPS: Failed to configure the "
2590                                    "new PSK");
2591                 }
2592                 os_free(wps->new_psk);
2593                 wps->new_psk = NULL;
2594         }
2595
2596         wps_cb_reg_success(wps->wps->registrar, wps->mac_addr_e, wps->uuid_e);
2597
2598         if (wps->pbc) {
2599                 wps_registrar_remove_pbc_session(wps->wps->registrar,
2600                                                  wps->mac_addr_e, wps->uuid_e);
2601                 wps_registrar_pbc_completed(wps->wps->registrar);
2602         } else {
2603                 wps_registrar_pin_completed(wps->wps->registrar);
2604         }
2605
2606         wps_success_event(wps->wps);
2607
2608         return WPS_DONE;
2609 }
2610
2611
2612 enum wps_process_res wps_registrar_process_msg(struct wps_data *wps,
2613                                                enum wsc_op_code op_code,
2614                                                const struct wpabuf *msg)
2615 {
2616         enum wps_process_res ret;
2617
2618         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
2619                    "op_code=%d)",
2620                    (unsigned long) wpabuf_len(msg), op_code);
2621
2622 #ifdef CONFIG_WPS_UPNP
2623         if (wps->wps->wps_upnp && op_code == WSC_MSG && wps->ext_reg == 1) {
2624                 struct wps_parse_attr attr;
2625                 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type &&
2626                     *attr.msg_type == WPS_M3)
2627                         wps->ext_reg = 2; /* past M2/M2D phase */
2628         }
2629         if (wps->ext_reg > 1)
2630                 wps_registrar_free_pending_m2(wps->wps);
2631         if (wps->wps->wps_upnp && wps->ext_reg &&
2632             wps->wps->upnp_msgs == NULL &&
2633             (op_code == WSC_MSG || op_code == WSC_Done)) {
2634                 struct wps_parse_attr attr;
2635                 int type;
2636                 if (wps_parse_msg(msg, &attr) < 0 || attr.msg_type == NULL)
2637                         type = -1;
2638                 else
2639                         type = *attr.msg_type;
2640                 wpa_printf(MSG_DEBUG, "WPS: Sending received message (type %d)"
2641                            " to external Registrar for processing", type);
2642                 upnp_wps_device_send_wlan_event(wps->wps->wps_upnp,
2643                                                 wps->mac_addr_e,
2644                                                 UPNP_WPS_WLANEVENT_TYPE_EAP,
2645                                                 msg);
2646                 if (op_code == WSC_MSG)
2647                         return WPS_PENDING;
2648         } else if (wps->wps->wps_upnp && wps->ext_reg && op_code == WSC_MSG) {
2649                 wpa_printf(MSG_DEBUG, "WPS: Skip internal processing - using "
2650                            "external Registrar");
2651                 return WPS_CONTINUE;
2652         }
2653 #endif /* CONFIG_WPS_UPNP */
2654
2655         switch (op_code) {
2656         case WSC_MSG:
2657                 return wps_process_wsc_msg(wps, msg);
2658         case WSC_ACK:
2659                 return wps_process_wsc_ack(wps, msg);
2660         case WSC_NACK:
2661                 return wps_process_wsc_nack(wps, msg);
2662         case WSC_Done:
2663                 ret = wps_process_wsc_done(wps, msg);
2664                 if (ret == WPS_FAILURE) {
2665                         wps->state = SEND_WSC_NACK;
2666                         wps_fail_event(wps->wps, WPS_WSC_DONE);
2667                 }
2668                 return ret;
2669         default:
2670                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
2671                 return WPS_FAILURE;
2672         }
2673 }
2674
2675
2676 int wps_registrar_update_ie(struct wps_registrar *reg)
2677 {
2678         return wps_set_ie(reg);
2679 }
2680
2681
2682 static void wps_registrar_set_selected_timeout(void *eloop_ctx,
2683                                                void *timeout_ctx)
2684 {
2685         struct wps_registrar *reg = eloop_ctx;
2686
2687         wpa_printf(MSG_DEBUG, "WPS: SetSelectedRegistrar timed out - "
2688                    "unselect Registrar");
2689         reg->selected_registrar = 0;
2690         reg->pbc = 0;
2691         reg->sel_reg_dev_password_id_override = -1;
2692         reg->sel_reg_config_methods_override = -1;
2693         wps_set_ie(reg);
2694 }
2695
2696
2697 /**
2698  * wps_registrar_set_selected_registrar - Notification of SetSelectedRegistrar
2699  * @reg: Registrar data from wps_registrar_init()
2700  * @msg: Received message from SetSelectedRegistrar
2701  * Returns: 0 on success, -1 on failure
2702  *
2703  * This function is called when an AP receives a SetSelectedRegistrar UPnP
2704  * message.
2705  */
2706 int wps_registrar_set_selected_registrar(struct wps_registrar *reg,
2707                                          const struct wpabuf *msg)
2708 {
2709         struct wps_parse_attr attr;
2710
2711         wpa_hexdump_buf(MSG_MSGDUMP, "WPS: SetSelectedRegistrar attributes",
2712                         msg);
2713
2714         if (wps_parse_msg(msg, &attr) < 0)
2715                 return -1;
2716         if (!wps_version_supported(attr.version)) {
2717                 wpa_printf(MSG_DEBUG, "WPS: Unsupported SetSelectedRegistrar "
2718                            "version 0x%x", attr.version ? *attr.version : 0);
2719                 return -1;
2720         }
2721
2722         if (attr.selected_registrar == NULL ||
2723             *attr.selected_registrar == 0) {
2724                 wpa_printf(MSG_DEBUG, "WPS: SetSelectedRegistrar: Disable "
2725                            "Selected Registrar");
2726                 eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg,
2727                                      NULL);
2728                 wps_registrar_set_selected_timeout(reg, NULL);
2729                 return 0;
2730         }
2731
2732         reg->selected_registrar = 1;
2733         reg->sel_reg_dev_password_id_override = attr.dev_password_id ?
2734                 WPA_GET_BE16(attr.dev_password_id) : DEV_PW_DEFAULT;
2735         reg->sel_reg_config_methods_override = attr.sel_reg_config_methods ?
2736                 WPA_GET_BE16(attr.sel_reg_config_methods) : -1;
2737         wps_set_ie(reg);
2738
2739         eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
2740         eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
2741                                wps_registrar_set_selected_timeout,
2742                                reg, NULL);
2743         return 0;
2744 }
2745
2746
2747 int wps_registrar_get_info(struct wps_registrar *reg, const u8 *addr,
2748                            char *buf, size_t buflen)
2749 {
2750         struct wps_registrar_device *d;
2751         int len = 0, ret;
2752         char uuid[40];
2753
2754         d = wps_device_get(reg, addr);
2755         if (d == NULL)
2756                 return 0;
2757         if (uuid_bin2str(d->uuid, uuid, sizeof(uuid)))
2758                 return 0;
2759
2760         ret = os_snprintf(buf + len, buflen - len,
2761                           "wpsUuid=%s\n"
2762                           "wpsPrimaryDeviceType=%u-%08X-%u\n"
2763                           "wpsDeviceName=%s\n"
2764                           "wpsManufacturer=%s\n"
2765                           "wpsModelName=%s\n"
2766                           "wpsModelNumber=%s\n"
2767                           "wpsSerialNumber=%s\n",
2768                           uuid,
2769                           d->dev.categ, d->dev.oui, d->dev.sub_categ,
2770                           d->dev.device_name ? d->dev.device_name : "",
2771                           d->dev.manufacturer ? d->dev.manufacturer : "",
2772                           d->dev.model_name ? d->dev.model_name : "",
2773                           d->dev.model_number ? d->dev.model_number : "",
2774                           d->dev.serial_number ? d->dev.serial_number : "");
2775         if (ret < 0 || (size_t) ret >= buflen - len)
2776                 return len;
2777         len += ret;
2778
2779         return len;
2780 }