src/wps/wps_enrollee.c

   1 /*
   2  * Wi-Fi Protected Setup - Enrollee
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "sha256.h"
  19 #include "wps_i.h"
  20 #include "wps_dev_attr.h"
  21 #include "crypto.h"
  22
  23
  24 static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg)
  25 {
  26         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address");
  27         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
  28         wpabuf_put_be16(msg, ETH_ALEN);
  29         wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN);
  30         return 0;
  31 }
  32
  33
  34 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
  35 {
  36         u8 state;
  37         if (wps->wps->ap)
  38                 state = wps->wps->wps_state;
  39         else
  40                 state = WPS_STATE_NOT_CONFIGURED;
  41         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
  42                    state);
  43         wpabuf_put_be16(msg, ATTR_WPS_STATE);
  44         wpabuf_put_be16(msg, 1);
  45         wpabuf_put_u8(msg, state);
  46         return 0;
  47 }
  48
  49
  50 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg)
  51 {
  52         u8 *hash;
  53         const u8 *addr[4];
  54         size_t len[4];
  55
  56         if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
  57                 return -1;
  58         wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
  59         wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
  60                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
  61
  62         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
  63                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
  64                            "E-Hash derivation");
  65                 return -1;
  66         }
  67
  68         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash1");
  69         wpabuf_put_be16(msg, ATTR_E_HASH1);
  70         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  71         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  72         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
  73         addr[0] = wps->snonce;
  74         len[0] = WPS_SECRET_NONCE_LEN;
  75         addr[1] = wps->psk1;
  76         len[1] = WPS_PSK_LEN;
  77         addr[2] = wpabuf_head(wps->dh_pubkey_e);
  78         len[2] = wpabuf_len(wps->dh_pubkey_e);
  79         addr[3] = wpabuf_head(wps->dh_pubkey_r);
  80         len[3] = wpabuf_len(wps->dh_pubkey_r);
  81         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  82         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
  83
  84         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash2");
  85         wpabuf_put_be16(msg, ATTR_E_HASH2);
  86         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  87         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  88         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
  89         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
  90         addr[1] = wps->psk2;
  91         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  92         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
  93
  94         return 0;
  95 }
  96
  97
  98 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
  99 {
 100         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce1");
 101         wpabuf_put_be16(msg, ATTR_E_SNONCE1);
 102         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 103         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
 104         return 0;
 105 }
 106
 107
 108 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
 109 {
 110         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce2");
 111         wpabuf_put_be16(msg, ATTR_E_SNONCE2);
 112         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 113         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
 114                         WPS_SECRET_NONCE_LEN);
 115         return 0;
 116 }
 117
 118
 119 static struct wpabuf * wps_build_m1(struct wps_data *wps)
 120 {
 121         struct wpabuf *msg;
 122         u16 methods;
 123
 124         if (os_get_random(wps->nonce_e, WPS_NONCE_LEN) < 0)
 125                 return NULL;
 126         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
 127                     wps->nonce_e, WPS_NONCE_LEN);
 128
 129         wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
 130         msg = wpabuf_alloc(1000);
 131         if (msg == NULL)
 132                 return NULL;
 133
 134         methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
 135 #ifdef CONFIG_WPS_UFD
 136         methods |= WPS_CONFIG_USBA;
 137 #endif /* CONFIG_WPS_UFD */
 138         if (wps->pbc)
 139                 methods |= WPS_CONFIG_PUSHBUTTON;
 140
 141         if (wps_build_version(msg) ||
 142             wps_build_msg_type(msg, WPS_M1) ||
 143             wps_build_uuid_e(msg, wps->uuid_e) ||
 144             wps_build_mac_addr(wps, msg) ||
 145             wps_build_enrollee_nonce(wps, msg) ||
 146             wps_build_public_key(wps, msg) ||
 147             wps_build_auth_type_flags(wps, msg) ||
 148             wps_build_encr_type_flags(wps, msg) ||
 149             wps_build_conn_type_flags(wps, msg) ||
 150             wps_build_config_methods(msg, methods) ||
 151             wps_build_wps_state(wps, msg) ||
 152             wps_build_device_attrs(&wps->wps->dev, msg) ||
 153             wps_build_rf_bands(&wps->wps->dev, msg) ||
 154             wps_build_assoc_state(wps, msg) ||
 155             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
 156             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 157             wps_build_os_version(&wps->wps->dev, msg)) {
 158                 wpabuf_free(msg);
 159                 return NULL;
 160         }
 161
 162         wps->state = RECV_M2;
 163         return msg;
 164 }
 165
 166
 167 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 168 {
 169         struct wpabuf *msg;
 170
 171         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 172
 173         if (wps->dev_password == NULL) {
 174                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 175                 return NULL;
 176         }
 177         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 178
 179         msg = wpabuf_alloc(1000);
 180         if (msg == NULL)
 181                 return NULL;
 182
 183         if (wps_build_version(msg) ||
 184             wps_build_msg_type(msg, WPS_M3) ||
 185             wps_build_registrar_nonce(wps, msg) ||
 186             wps_build_e_hash(wps, msg) ||
 187             wps_build_authenticator(wps, msg)) {
 188                 wpabuf_free(msg);
 189                 return NULL;
 190         }
 191
 192         wps->state = RECV_M4;
 193         return msg;
 194 }
 195
 196
 197 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 198 {
 199         struct wpabuf *msg, *plain;
 200
 201         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 202
 203         plain = wpabuf_alloc(200);
 204         if (plain == NULL)
 205                 return NULL;
 206
 207         msg = wpabuf_alloc(1000);
 208         if (msg == NULL) {
 209                 wpabuf_free(plain);
 210                 return NULL;
 211         }
 212
 213         if (wps_build_version(msg) ||
 214             wps_build_msg_type(msg, WPS_M5) ||
 215             wps_build_registrar_nonce(wps, msg) ||
 216             wps_build_e_snonce1(wps, plain) ||
 217             wps_build_key_wrap_auth(wps, plain) ||
 218             wps_build_encr_settings(wps, msg, plain) ||
 219             wps_build_authenticator(wps, msg)) {
 220                 wpabuf_free(plain);
 221                 wpabuf_free(msg);
 222                 return NULL;
 223         }
 224         wpabuf_free(plain);
 225
 226         wps->state = RECV_M6;
 227         return msg;
 228 }
 229
 230
 231 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 232 {
 233         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 234         wpabuf_put_be16(msg, ATTR_SSID);
 235         wpabuf_put_be16(msg, wps->wps->ssid_len);
 236         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 237         return 0;
 238 }
 239
 240
 241 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 242 {
 243         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
 244         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 245         wpabuf_put_be16(msg, 2);
 246         wpabuf_put_be16(msg, wps->wps->auth_types);
 247         return 0;
 248 }
 249
 250
 251 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 252 {
 253         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
 254         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 255         wpabuf_put_be16(msg, 2);
 256         wpabuf_put_be16(msg, wps->wps->encr_types);
 257         return 0;
 258 }
 259
 260
 261 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 262 {
 263         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 264         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 265         wpabuf_put_be16(msg, wps->wps->network_key_len);
 266         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 267         return 0;
 268 }
 269
 270
 271 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 272 {
 273         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 274         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 275         wpabuf_put_be16(msg, ETH_ALEN);
 276         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 277         return 0;
 278 }
 279
 280
 281 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
 282 {
 283         if (wps->wps->ap_settings) {
 284                 wpa_printf(MSG_DEBUG, "WPS:  * AP Settings (pre-configured)");
 285                 wpabuf_put_data(plain, wps->wps->ap_settings,
 286                                 wps->wps->ap_settings_len);
 287                 return 0;
 288         }
 289
 290         return wps_build_cred_ssid(wps, plain) ||
 291                 wps_build_cred_mac_addr(wps, plain) ||
 292                 wps_build_cred_auth_type(wps, plain) ||
 293                 wps_build_cred_encr_type(wps, plain) ||
 294                 wps_build_cred_network_key(wps, plain);
 295 }
 296
 297
 298 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 299 {
 300         struct wpabuf *msg, *plain;
 301
 302         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 303
 304         plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
 305         if (plain == NULL)
 306                 return NULL;
 307
 308         msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
 309         if (msg == NULL) {
 310                 wpabuf_free(plain);
 311                 return NULL;
 312         }
 313
 314         if (wps_build_version(msg) ||
 315             wps_build_msg_type(msg, WPS_M7) ||
 316             wps_build_registrar_nonce(wps, msg) ||
 317             wps_build_e_snonce2(wps, plain) ||
 318             (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
 319             wps_build_key_wrap_auth(wps, plain) ||
 320             wps_build_encr_settings(wps, msg, plain) ||
 321             wps_build_authenticator(wps, msg)) {
 322                 wpabuf_free(plain);
 323                 wpabuf_free(msg);
 324                 return NULL;
 325         }
 326         wpabuf_free(plain);
 327
 328         wps->state = RECV_M8;
 329         return msg;
 330 }
 331
 332
 333 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 334 {
 335         struct wpabuf *msg;
 336
 337         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 338
 339         msg = wpabuf_alloc(1000);
 340         if (msg == NULL)
 341                 return NULL;
 342
 343         if (wps_build_version(msg) ||
 344             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 345             wps_build_enrollee_nonce(wps, msg) ||
 346             wps_build_registrar_nonce(wps, msg)) {
 347                 wpabuf_free(msg);
 348                 return NULL;
 349         }
 350
 351         if (wps->wps->ap)
 352                 wps->state = RECV_ACK;
 353         else {
 354                 wps_success_event(wps->wps);
 355                 wps->state = WPS_FINISHED;
 356         }
 357         return msg;
 358 }
 359
 360
 361 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
 362 {
 363         struct wpabuf *msg;
 364
 365         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
 366
 367         msg = wpabuf_alloc(1000);
 368         if (msg == NULL)
 369                 return NULL;
 370
 371         if (wps_build_version(msg) ||
 372             wps_build_msg_type(msg, WPS_WSC_ACK) ||
 373             wps_build_enrollee_nonce(wps, msg) ||
 374             wps_build_registrar_nonce(wps, msg)) {
 375                 wpabuf_free(msg);
 376                 return NULL;
 377         }
 378
 379         return msg;
 380 }
 381
 382
 383 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
 384 {
 385         struct wpabuf *msg;
 386
 387         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
 388
 389         msg = wpabuf_alloc(1000);
 390         if (msg == NULL)
 391                 return NULL;
 392
 393         if (wps_build_version(msg) ||
 394             wps_build_msg_type(msg, WPS_WSC_NACK) ||
 395             wps_build_enrollee_nonce(wps, msg) ||
 396             wps_build_registrar_nonce(wps, msg) ||
 397             wps_build_config_error(msg, wps->config_error)) {
 398                 wpabuf_free(msg);
 399                 return NULL;
 400         }
 401
 402         return msg;
 403 }
 404
 405
 406 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
 407                                      enum wsc_op_code *op_code)
 408 {
 409         struct wpabuf *msg;
 410
 411         switch (wps->state) {
 412         case SEND_M1:
 413                 msg = wps_build_m1(wps);
 414                 *op_code = WSC_MSG;
 415                 break;
 416         case SEND_M3:
 417                 msg = wps_build_m3(wps);
 418                 *op_code = WSC_MSG;
 419                 break;
 420         case SEND_M5:
 421                 msg = wps_build_m5(wps);
 422                 *op_code = WSC_MSG;
 423                 break;
 424         case SEND_M7:
 425                 msg = wps_build_m7(wps);
 426                 *op_code = WSC_MSG;
 427                 break;
 428         case RECEIVED_M2D:
 429                 if (wps->wps->ap) {
 430                         msg = wps_build_wsc_nack(wps);
 431                         *op_code = WSC_NACK;
 432                         break;
 433                 }
 434                 msg = wps_build_wsc_ack(wps);
 435                 *op_code = WSC_ACK;
 436                 if (msg) {
 437                         /* Another M2/M2D may be received */
 438                         wps->state = RECV_M2;
 439                 }
 440                 break;
 441         case SEND_WSC_NACK:
 442                 msg = wps_build_wsc_nack(wps);
 443                 *op_code = WSC_NACK;
 444                 break;
 445         case WPS_MSG_DONE:
 446                 msg = wps_build_wsc_done(wps);
 447                 *op_code = WSC_Done;
 448                 break;
 449         default:
 450                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 451                            "a message", wps->state);
 452                 msg = NULL;
 453                 break;
 454         }
 455
 456         if (*op_code == WSC_MSG && msg) {
 457                 /* Save a copy of the last message for Authenticator derivation
 458                  */
 459                 wpabuf_free(wps->last_msg);
 460                 wps->last_msg = wpabuf_dup(msg);
 461         }
 462
 463         return msg;
 464 }
 465
 466
 467 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 468 {
 469         if (r_nonce == NULL) {
 470                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 471                 return -1;
 472         }
 473
 474         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 475         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 476                     wps->nonce_r, WPS_NONCE_LEN);
 477
 478         return 0;
 479 }
 480
 481
 482 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 483 {
 484         if (e_nonce == NULL) {
 485                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 486                 return -1;
 487         }
 488
 489         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 490                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 491                 return -1;
 492         }
 493
 494         return 0;
 495 }
 496
 497
 498 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 499 {
 500         if (uuid_r == NULL) {
 501                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 502                 return -1;
 503         }
 504
 505         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 506         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 507
 508         return 0;
 509 }
 510
 511
 512 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 513                               size_t pk_len)
 514 {
 515         if (pk == NULL || pk_len == 0) {
 516                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 517                 return -1;
 518         }
 519
 520 #ifdef CONFIG_WPS_OOB
 521         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
 522             wps->wps->oob_conf.pubkey_hash) {
 523                 const u8 *addr[1];
 524                 u8 hash[WPS_HASH_LEN];
 525
 526                 addr[0] = pk;
 527                 sha256_vector(1, addr, &pk_len, hash);
 528                 if (os_memcmp(hash,
 529                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
 530                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 531                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
 532                         return -1;
 533                 }
 534         }
 535 #endif /* CONFIG_WPS_OOB */
 536
 537         wpabuf_free(wps->dh_pubkey_r);
 538         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 539         if (wps->dh_pubkey_r == NULL)
 540                 return -1;
 541
 542         if (wps_derive_keys(wps) < 0)
 543                 return -1;
 544
 545         if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
 546             wps_derive_mgmt_keys(wps) < 0)
 547                 return -1;
 548
 549         return 0;
 550 }
 551
 552
 553 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 554 {
 555         if (r_hash1 == NULL) {
 556                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 557                 return -1;
 558         }
 559
 560         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 561         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 562
 563         return 0;
 564 }
 565
 566
 567 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 568 {
 569         if (r_hash2 == NULL) {
 570                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 571                 return -1;
 572         }
 573
 574         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 575         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 576
 577         return 0;
 578 }
 579
 580
 581 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 582 {
 583         u8 hash[SHA256_MAC_LEN];
 584         const u8 *addr[4];
 585         size_t len[4];
 586
 587         if (r_snonce1 == NULL) {
 588                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 589                 return -1;
 590         }
 591
 592         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 593                         WPS_SECRET_NONCE_LEN);
 594
 595         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 596         addr[0] = r_snonce1;
 597         len[0] = WPS_SECRET_NONCE_LEN;
 598         addr[1] = wps->psk1;
 599         len[1] = WPS_PSK_LEN;
 600         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 601         len[2] = wpabuf_len(wps->dh_pubkey_e);
 602         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 603         len[3] = wpabuf_len(wps->dh_pubkey_r);
 604         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 605
 606         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 607                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 608                            "not match with the pre-committed value");
 609                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 610                 wps_pwd_auth_fail_event(wps->wps, 1, 1);
 611                 return -1;
 612         }
 613
 614         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 615                    "half of the device password");
 616
 617         return 0;
 618 }
 619
 620
 621 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 622 {
 623         u8 hash[SHA256_MAC_LEN];
 624         const u8 *addr[4];
 625         size_t len[4];
 626
 627         if (r_snonce2 == NULL) {
 628                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 629                 return -1;
 630         }
 631
 632         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 633                         WPS_SECRET_NONCE_LEN);
 634
 635         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 636         addr[0] = r_snonce2;
 637         len[0] = WPS_SECRET_NONCE_LEN;
 638         addr[1] = wps->psk2;
 639         len[1] = WPS_PSK_LEN;
 640         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 641         len[2] = wpabuf_len(wps->dh_pubkey_e);
 642         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 643         len[3] = wpabuf_len(wps->dh_pubkey_r);
 644         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 645
 646         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 647                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 648                            "not match with the pre-committed value");
 649                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 650                 wps_pwd_auth_fail_event(wps->wps, 1, 2);
 651                 return -1;
 652         }
 653
 654         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 655                    "half of the device password");
 656
 657         return 0;
 658 }
 659
 660
 661 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 662                               size_t cred_len)
 663 {
 664         struct wps_parse_attr attr;
 665         struct wpabuf msg;
 666
 667         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 668         os_memset(&wps->cred, 0, sizeof(wps->cred));
 669         wpabuf_set(&msg, cred, cred_len);
 670         if (wps_parse_msg(&msg, &attr) < 0 ||
 671             wps_process_cred(&attr, &wps->cred))
 672                 return -1;
 673
 674         if (wps->wps->cred_cb) {
 675                 wps->cred.cred_attr = cred - 4;
 676                 wps->cred.cred_attr_len = cred_len + 4;
 677                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 678                 wps->cred.cred_attr = NULL;
 679                 wps->cred.cred_attr_len = 0;
 680         }
 681
 682         return 0;
 683 }
 684
 685
 686 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 687                              size_t cred_len[], size_t num_cred)
 688 {
 689         size_t i;
 690
 691         if (wps->wps->ap)
 692                 return 0;
 693
 694         if (num_cred == 0) {
 695                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 696                            "received");
 697                 return -1;
 698         }
 699
 700         for (i = 0; i < num_cred; i++) {
 701                 if (wps_process_cred_e(wps, cred[i], cred_len[i]))
 702                         return -1;
 703         }
 704
 705         return 0;
 706 }
 707
 708
 709 static int wps_process_ap_settings_e(struct wps_data *wps,
 710                                      struct wps_parse_attr *attr,
 711                                      struct wpabuf *attrs)
 712 {
 713         struct wps_credential cred;
 714
 715         if (!wps->wps->ap)
 716                 return 0;
 717
 718         if (wps_process_ap_settings(attr, &cred) < 0)
 719                 return -1;
 720
 721         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 722                    "Registrar");
 723
 724         if (wps->wps->cred_cb) {
 725                 cred.cred_attr = wpabuf_head(attrs);
 726                 cred.cred_attr_len = wpabuf_len(attrs);
 727                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 728         }
 729
 730         return 0;
 731 }
 732
 733
 734 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 735                                            const struct wpabuf *msg,
 736                                            struct wps_parse_attr *attr)
 737 {
 738         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 739
 740         if (wps->state != RECV_M2) {
 741                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 742                            "receiving M2", wps->state);
 743                 wps->state = SEND_WSC_NACK;
 744                 return WPS_CONTINUE;
 745         }
 746
 747         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 748             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 749             wps_process_uuid_r(wps, attr->uuid_r) ||
 750             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 751             wps_process_authenticator(wps, attr->authenticator, msg)) {
 752                 wps->state = SEND_WSC_NACK;
 753                 return WPS_CONTINUE;
 754         }
 755
 756         if (wps->wps->ap && wps->wps->ap_setup_locked) {
 757                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 758                            "registration of a new Registrar");
 759                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 760                 wps->state = SEND_WSC_NACK;
 761                 return WPS_CONTINUE;
 762         }
 763
 764         wps->state = SEND_M3;
 765         return WPS_CONTINUE;
 766 }
 767
 768
 769 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 770                                             struct wps_parse_attr *attr)
 771 {
 772         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 773
 774         if (wps->state != RECV_M2) {
 775                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 776                            "receiving M2D", wps->state);
 777                 wps->state = SEND_WSC_NACK;
 778                 return WPS_CONTINUE;
 779         }
 780
 781         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 782                           attr->manufacturer, attr->manufacturer_len);
 783         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 784                           attr->model_name, attr->model_name_len);
 785         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 786                           attr->model_number, attr->model_number_len);
 787         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 788                           attr->serial_number, attr->serial_number_len);
 789         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 790                           attr->dev_name, attr->dev_name_len);
 791
 792         if (wps->wps->event_cb) {
 793                 union wps_event_data data;
 794                 struct wps_event_m2d *m2d = &data.m2d;
 795                 os_memset(&data, 0, sizeof(data));
 796                 if (attr->config_methods)
 797                         m2d->config_methods =
 798                                 WPA_GET_BE16(attr->config_methods);
 799                 m2d->manufacturer = attr->manufacturer;
 800                 m2d->manufacturer_len = attr->manufacturer_len;
 801                 m2d->model_name = attr->model_name;
 802                 m2d->model_name_len = attr->model_name_len;
 803                 m2d->model_number = attr->model_number;
 804                 m2d->model_number_len = attr->model_number_len;
 805                 m2d->serial_number = attr->serial_number;
 806                 m2d->serial_number_len = attr->serial_number_len;
 807                 m2d->dev_name = attr->dev_name;
 808                 m2d->dev_name_len = attr->dev_name_len;
 809                 m2d->primary_dev_type = attr->primary_dev_type;
 810                 if (attr->config_error)
 811                         m2d->config_error =
 812                                 WPA_GET_BE16(attr->config_error);
 813                 if (attr->dev_password_id)
 814                         m2d->dev_password_id =
 815                                 WPA_GET_BE16(attr->dev_password_id);
 816                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 817         }
 818
 819         wps->state = RECEIVED_M2D;
 820         return WPS_CONTINUE;
 821 }
 822
 823
 824 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 825                                            const struct wpabuf *msg,
 826                                            struct wps_parse_attr *attr)
 827 {
 828         struct wpabuf *decrypted;
 829         struct wps_parse_attr eattr;
 830
 831         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 832
 833         if (wps->state != RECV_M4) {
 834                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 835                            "receiving M4", wps->state);
 836                 wps->state = SEND_WSC_NACK;
 837                 return WPS_CONTINUE;
 838         }
 839
 840         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 841             wps_process_authenticator(wps, attr->authenticator, msg) ||
 842             wps_process_r_hash1(wps, attr->r_hash1) ||
 843             wps_process_r_hash2(wps, attr->r_hash2)) {
 844                 wps->state = SEND_WSC_NACK;
 845                 return WPS_CONTINUE;
 846         }
 847
 848         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 849                                               attr->encr_settings_len);
 850         if (decrypted == NULL) {
 851                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 852                            "Settings attribute");
 853                 wps->state = SEND_WSC_NACK;
 854                 return WPS_CONTINUE;
 855         }
 856
 857         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 858                    "attribute");
 859         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 860             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 861             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 862                 wpabuf_free(decrypted);
 863                 wps->state = SEND_WSC_NACK;
 864                 return WPS_CONTINUE;
 865         }
 866         wpabuf_free(decrypted);
 867
 868         wps->state = SEND_M5;
 869         return WPS_CONTINUE;
 870 }
 871
 872
 873 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 874                                            const struct wpabuf *msg,
 875                                            struct wps_parse_attr *attr)
 876 {
 877         struct wpabuf *decrypted;
 878         struct wps_parse_attr eattr;
 879
 880         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 881
 882         if (wps->state != RECV_M6) {
 883                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 884                            "receiving M6", wps->state);
 885                 wps->state = SEND_WSC_NACK;
 886                 return WPS_CONTINUE;
 887         }
 888
 889         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 890             wps_process_authenticator(wps, attr->authenticator, msg)) {
 891                 wps->state = SEND_WSC_NACK;
 892                 return WPS_CONTINUE;
 893         }
 894
 895         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 896                                               attr->encr_settings_len);
 897         if (decrypted == NULL) {
 898                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 899                            "Settings attribute");
 900                 wps->state = SEND_WSC_NACK;
 901                 return WPS_CONTINUE;
 902         }
 903
 904         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 905                    "attribute");
 906         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 907             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 908             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 909                 wpabuf_free(decrypted);
 910                 wps->state = SEND_WSC_NACK;
 911                 return WPS_CONTINUE;
 912         }
 913         wpabuf_free(decrypted);
 914
 915         wps->state = SEND_M7;
 916         return WPS_CONTINUE;
 917 }
 918
 919
 920 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 921                                            const struct wpabuf *msg,
 922                                            struct wps_parse_attr *attr)
 923 {
 924         struct wpabuf *decrypted;
 925         struct wps_parse_attr eattr;
 926
 927         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 928
 929         if (wps->state != RECV_M8) {
 930                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 931                            "receiving M8", wps->state);
 932                 wps->state = SEND_WSC_NACK;
 933                 return WPS_CONTINUE;
 934         }
 935
 936         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 937             wps_process_authenticator(wps, attr->authenticator, msg)) {
 938                 wps->state = SEND_WSC_NACK;
 939                 return WPS_CONTINUE;
 940         }
 941
 942         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 943                                               attr->encr_settings_len);
 944         if (decrypted == NULL) {
 945                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 946                            "Settings attribute");
 947                 wps->state = SEND_WSC_NACK;
 948                 return WPS_CONTINUE;
 949         }
 950
 951         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 952                    "attribute");
 953         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 954             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 955             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 956                               eattr.num_cred) ||
 957             wps_process_ap_settings_e(wps, &eattr, decrypted)) {
 958                 wpabuf_free(decrypted);
 959                 wps->state = SEND_WSC_NACK;
 960                 return WPS_CONTINUE;
 961         }
 962         wpabuf_free(decrypted);
 963
 964         wps->state = WPS_MSG_DONE;
 965         return WPS_CONTINUE;
 966 }
 967
 968
 969 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
 970                                                 const struct wpabuf *msg)
 971 {
 972         struct wps_parse_attr attr;
 973         enum wps_process_res ret = WPS_CONTINUE;
 974
 975         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
 976
 977         if (wps_parse_msg(msg, &attr) < 0)
 978                 return WPS_FAILURE;
 979
 980         if (!wps_version_supported(attr.version)) {
 981                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 982                            attr.version ? *attr.version : 0);
 983                 return WPS_FAILURE;
 984         }
 985
 986         if (attr.enrollee_nonce == NULL ||
 987             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
 988                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
 989                 return WPS_FAILURE;
 990         }
 991
 992         if (attr.msg_type == NULL) {
 993                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
 994                 return WPS_FAILURE;
 995         }
 996
 997         switch (*attr.msg_type) {
 998         case WPS_M2:
 999                 ret = wps_process_m2(wps, msg, &attr);
1000                 break;
1001         case WPS_M2D:
1002                 ret = wps_process_m2d(wps, &attr);
1003                 break;
1004         case WPS_M4:
1005                 ret = wps_process_m4(wps, msg, &attr);
1006                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1007                         wps_fail_event(wps->wps, WPS_M4);
1008                 break;
1009         case WPS_M6:
1010                 ret = wps_process_m6(wps, msg, &attr);
1011                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1012                         wps_fail_event(wps->wps, WPS_M6);
1013                 break;
1014         case WPS_M8:
1015                 ret = wps_process_m8(wps, msg, &attr);
1016                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1017                         wps_fail_event(wps->wps, WPS_M8);
1018                 break;
1019         default:
1020                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1021                            *attr.msg_type);
1022                 return WPS_FAILURE;
1023         }
1024
1025         /*
1026          * Save a copy of the last message for Authenticator derivation if we
1027          * are continuing. However, skip M2D since it is not authenticated and
1028          * neither is the ACK/NACK response frame. This allows the possibly
1029          * following M2 to be processed correctly by using the previously sent
1030          * M1 in Authenticator derivation.
1031          */
1032         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1033                 /* Save a copy of the last message for Authenticator derivation
1034                  */
1035                 wpabuf_free(wps->last_msg);
1036                 wps->last_msg = wpabuf_dup(msg);
1037         }
1038
1039         return ret;
1040 }
1041
1042
1043 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1044                                                 const struct wpabuf *msg)
1045 {
1046         struct wps_parse_attr attr;
1047
1048         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1049
1050         if (wps_parse_msg(msg, &attr) < 0)
1051                 return WPS_FAILURE;
1052
1053         if (!wps_version_supported(attr.version)) {
1054                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1055                            attr.version ? *attr.version : 0);
1056                 return WPS_FAILURE;
1057         }
1058
1059         if (attr.msg_type == NULL) {
1060                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1061                 return WPS_FAILURE;
1062         }
1063
1064         if (*attr.msg_type != WPS_WSC_ACK) {
1065                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1066                            *attr.msg_type);
1067                 return WPS_FAILURE;
1068         }
1069
1070         if (attr.registrar_nonce == NULL ||
1071             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1072         {
1073                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1074                 return WPS_FAILURE;
1075         }
1076
1077         if (attr.enrollee_nonce == NULL ||
1078             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1079                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1080                 return WPS_FAILURE;
1081         }
1082
1083         if (wps->state == RECV_ACK && wps->wps->ap) {
1084                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1085                            "completed successfully");
1086                 wps_success_event(wps->wps);
1087                 wps->state = WPS_FINISHED;
1088                 return WPS_DONE;
1089         }
1090
1091         return WPS_FAILURE;
1092 }
1093
1094
1095 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1096                                                  const struct wpabuf *msg)
1097 {
1098         struct wps_parse_attr attr;
1099
1100         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1101
1102         if (wps_parse_msg(msg, &attr) < 0)
1103                 return WPS_FAILURE;
1104
1105         if (!wps_version_supported(attr.version)) {
1106                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1107                            attr.version ? *attr.version : 0);
1108                 return WPS_FAILURE;
1109         }
1110
1111         if (attr.msg_type == NULL) {
1112                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1113                 return WPS_FAILURE;
1114         }
1115
1116         if (*attr.msg_type != WPS_WSC_NACK) {
1117                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1118                            *attr.msg_type);
1119                 return WPS_FAILURE;
1120         }
1121
1122         if (attr.registrar_nonce == NULL ||
1123             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1124         {
1125                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1126                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1127                             attr.registrar_nonce, WPS_NONCE_LEN);
1128                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1129                             wps->nonce_r, WPS_NONCE_LEN);
1130                 return WPS_FAILURE;
1131         }
1132
1133         if (attr.enrollee_nonce == NULL ||
1134             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1135                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1136                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1137                             attr.enrollee_nonce, WPS_NONCE_LEN);
1138                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1139                             wps->nonce_e, WPS_NONCE_LEN);
1140                 return WPS_FAILURE;
1141         }
1142
1143         if (attr.config_error == NULL) {
1144                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1145                            "in WSC_NACK");
1146                 return WPS_FAILURE;
1147         }
1148
1149         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1150                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1151
1152         switch (wps->state) {
1153         case RECV_M4:
1154                 wps_fail_event(wps->wps, WPS_M3);
1155                 break;
1156         case RECV_M6:
1157                 wps_fail_event(wps->wps, WPS_M5);
1158                 break;
1159         case RECV_M8:
1160                 wps_fail_event(wps->wps, WPS_M7);
1161                 break;
1162         default:
1163                 break;
1164         }
1165
1166         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1167          * Enrollee is Authenticator */
1168         wps->state = SEND_WSC_NACK;
1169
1170         return WPS_FAILURE;
1171 }
1172
1173
1174 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1175                                               enum wsc_op_code op_code,
1176                                               const struct wpabuf *msg)
1177 {
1178
1179         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1180                    "op_code=%d)",
1181                    (unsigned long) wpabuf_len(msg), op_code);
1182
1183         switch (op_code) {
1184         case WSC_MSG:
1185         case WSC_UPnP:
1186                 return wps_process_wsc_msg(wps, msg);
1187         case WSC_ACK:
1188                 return wps_process_wsc_ack(wps, msg);
1189         case WSC_NACK:
1190                 return wps_process_wsc_nack(wps, msg);
1191         default:
1192                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1193                 return WPS_FAILURE;
1194         }
1195 }