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