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 #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         if (wps->wps->oob_conf.pubkey_hash != NULL) {
 521                 const u8 *addr[1];
 522                 u8 hash[WPS_HASH_LEN];
 523
 524                 addr[0] = pk;
 525                 sha256_vector(1, addr, &pk_len, hash);
 526                 if (os_memcmp(hash,
 527                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
 528                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 529                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
 530                         return -1;
 531                 }
 532         }
 533
 534         wpabuf_free(wps->dh_pubkey_r);
 535         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 536         if (wps->dh_pubkey_r == NULL)
 537                 return -1;
 538
 539         if (wps_derive_keys(wps) < 0)
 540                 return -1;
 541
 542         if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
 543             wps_derive_mgmt_keys(wps) < 0)
 544                 return -1;
 545
 546         return 0;
 547 }
 548
 549
 550 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 551 {
 552         if (r_hash1 == NULL) {
 553                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 554                 return -1;
 555         }
 556
 557         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 558         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 559
 560         return 0;
 561 }
 562
 563
 564 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 565 {
 566         if (r_hash2 == NULL) {
 567                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 568                 return -1;
 569         }
 570
 571         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 572         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 573
 574         return 0;
 575 }
 576
 577
 578 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 579 {
 580         u8 hash[SHA256_MAC_LEN];
 581         const u8 *addr[4];
 582         size_t len[4];
 583
 584         if (r_snonce1 == NULL) {
 585                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 586                 return -1;
 587         }
 588
 589         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 590                         WPS_SECRET_NONCE_LEN);
 591
 592         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 593         addr[0] = r_snonce1;
 594         len[0] = WPS_SECRET_NONCE_LEN;
 595         addr[1] = wps->psk1;
 596         len[1] = WPS_PSK_LEN;
 597         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 598         len[2] = wpabuf_len(wps->dh_pubkey_e);
 599         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 600         len[3] = wpabuf_len(wps->dh_pubkey_r);
 601         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 602
 603         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 604                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 605                            "not match with the pre-committed value");
 606                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 607                 wps_pwd_auth_fail_event(wps->wps, 1, 1);
 608                 return -1;
 609         }
 610
 611         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 612                    "half of the device password");
 613
 614         return 0;
 615 }
 616
 617
 618 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 619 {
 620         u8 hash[SHA256_MAC_LEN];
 621         const u8 *addr[4];
 622         size_t len[4];
 623
 624         if (r_snonce2 == NULL) {
 625                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 626                 return -1;
 627         }
 628
 629         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 630                         WPS_SECRET_NONCE_LEN);
 631
 632         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 633         addr[0] = r_snonce2;
 634         len[0] = WPS_SECRET_NONCE_LEN;
 635         addr[1] = wps->psk2;
 636         len[1] = WPS_PSK_LEN;
 637         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 638         len[2] = wpabuf_len(wps->dh_pubkey_e);
 639         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 640         len[3] = wpabuf_len(wps->dh_pubkey_r);
 641         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 642
 643         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 644                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 645                            "not match with the pre-committed value");
 646                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 647                 wps_pwd_auth_fail_event(wps->wps, 1, 2);
 648                 return -1;
 649         }
 650
 651         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 652                    "half of the device password");
 653
 654         return 0;
 655 }
 656
 657
 658 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 659                               size_t cred_len)
 660 {
 661         struct wps_parse_attr attr;
 662         struct wpabuf msg;
 663
 664         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 665         os_memset(&wps->cred, 0, sizeof(wps->cred));
 666         wpabuf_set(&msg, cred, cred_len);
 667         if (wps_parse_msg(&msg, &attr) < 0 ||
 668             wps_process_cred(&attr, &wps->cred))
 669                 return -1;
 670
 671         if (wps->wps->cred_cb) {
 672                 wps->cred.cred_attr = cred - 4;
 673                 wps->cred.cred_attr_len = cred_len + 4;
 674                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 675                 wps->cred.cred_attr = NULL;
 676                 wps->cred.cred_attr_len = 0;
 677         }
 678
 679         return 0;
 680 }
 681
 682
 683 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 684                              size_t cred_len[], size_t num_cred)
 685 {
 686         size_t i;
 687
 688         if (wps->wps->ap)
 689                 return 0;
 690
 691         if (num_cred == 0) {
 692                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 693                            "received");
 694                 return -1;
 695         }
 696
 697         for (i = 0; i < num_cred; i++) {
 698                 if (wps_process_cred_e(wps, cred[i], cred_len[i]))
 699                         return -1;
 700         }
 701
 702         return 0;
 703 }
 704
 705
 706 static int wps_process_ap_settings_e(struct wps_data *wps,
 707                                      struct wps_parse_attr *attr,
 708                                      struct wpabuf *attrs)
 709 {
 710         struct wps_credential cred;
 711
 712         if (!wps->wps->ap)
 713                 return 0;
 714
 715         if (wps_process_ap_settings(attr, &cred) < 0)
 716                 return -1;
 717
 718         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 719                    "Registrar");
 720
 721         if (wps->wps->cred_cb) {
 722                 cred.cred_attr = wpabuf_head(attrs);
 723                 cred.cred_attr_len = wpabuf_len(attrs);
 724                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 725         }
 726
 727         return 0;
 728 }
 729
 730
 731 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 732                                            const struct wpabuf *msg,
 733                                            struct wps_parse_attr *attr)
 734 {
 735         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 736
 737         if (wps->state != RECV_M2) {
 738                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 739                            "receiving M2", wps->state);
 740                 wps->state = SEND_WSC_NACK;
 741                 return WPS_CONTINUE;
 742         }
 743
 744         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 745             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 746             wps_process_uuid_r(wps, attr->uuid_r) ||
 747             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 748             wps_process_authenticator(wps, attr->authenticator, msg)) {
 749                 wps->state = SEND_WSC_NACK;
 750                 return WPS_CONTINUE;
 751         }
 752
 753         if (wps->wps->ap && wps->wps->ap_setup_locked) {
 754                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 755                            "registration of a new Registrar");
 756                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 757                 wps->state = SEND_WSC_NACK;
 758                 return WPS_CONTINUE;
 759         }
 760
 761         wps->state = SEND_M3;
 762         return WPS_CONTINUE;
 763 }
 764
 765
 766 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 767                                             struct wps_parse_attr *attr)
 768 {
 769         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 770
 771         if (wps->state != RECV_M2) {
 772                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 773                            "receiving M2D", wps->state);
 774                 wps->state = SEND_WSC_NACK;
 775                 return WPS_CONTINUE;
 776         }
 777
 778         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 779                           attr->manufacturer, attr->manufacturer_len);
 780         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 781                           attr->model_name, attr->model_name_len);
 782         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 783                           attr->model_number, attr->model_number_len);
 784         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 785                           attr->serial_number, attr->serial_number_len);
 786         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 787                           attr->dev_name, attr->dev_name_len);
 788
 789         if (wps->wps->event_cb) {
 790                 union wps_event_data data;
 791                 struct wps_event_m2d *m2d = &data.m2d;
 792                 os_memset(&data, 0, sizeof(data));
 793                 if (attr->config_methods)
 794                         m2d->config_methods =
 795                                 WPA_GET_BE16(attr->config_methods);
 796                 m2d->manufacturer = attr->manufacturer;
 797                 m2d->manufacturer_len = attr->manufacturer_len;
 798                 m2d->model_name = attr->model_name;
 799                 m2d->model_name_len = attr->model_name_len;
 800                 m2d->model_number = attr->model_number;
 801                 m2d->model_number_len = attr->model_number_len;
 802                 m2d->serial_number = attr->serial_number;
 803                 m2d->serial_number_len = attr->serial_number_len;
 804                 m2d->dev_name = attr->dev_name;
 805                 m2d->dev_name_len = attr->dev_name_len;
 806                 m2d->primary_dev_type = attr->primary_dev_type;
 807                 if (attr->config_error)
 808                         m2d->config_error =
 809                                 WPA_GET_BE16(attr->config_error);
 810                 if (attr->dev_password_id)
 811                         m2d->dev_password_id =
 812                                 WPA_GET_BE16(attr->dev_password_id);
 813                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 814         }
 815
 816         wps->state = RECEIVED_M2D;
 817         return WPS_CONTINUE;
 818 }
 819
 820
 821 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 822                                            const struct wpabuf *msg,
 823                                            struct wps_parse_attr *attr)
 824 {
 825         struct wpabuf *decrypted;
 826         struct wps_parse_attr eattr;
 827
 828         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 829
 830         if (wps->state != RECV_M4) {
 831                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 832                            "receiving M4", wps->state);
 833                 wps->state = SEND_WSC_NACK;
 834                 return WPS_CONTINUE;
 835         }
 836
 837         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 838             wps_process_authenticator(wps, attr->authenticator, msg) ||
 839             wps_process_r_hash1(wps, attr->r_hash1) ||
 840             wps_process_r_hash2(wps, attr->r_hash2)) {
 841                 wps->state = SEND_WSC_NACK;
 842                 return WPS_CONTINUE;
 843         }
 844
 845         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 846                                               attr->encr_settings_len);
 847         if (decrypted == NULL) {
 848                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 849                            "Settings attribute");
 850                 wps->state = SEND_WSC_NACK;
 851                 return WPS_CONTINUE;
 852         }
 853
 854         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 855                    "attribute");
 856         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 857             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 858             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 859                 wpabuf_free(decrypted);
 860                 wps->state = SEND_WSC_NACK;
 861                 return WPS_CONTINUE;
 862         }
 863         wpabuf_free(decrypted);
 864
 865         wps->state = SEND_M5;
 866         return WPS_CONTINUE;
 867 }
 868
 869
 870 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 871                                            const struct wpabuf *msg,
 872                                            struct wps_parse_attr *attr)
 873 {
 874         struct wpabuf *decrypted;
 875         struct wps_parse_attr eattr;
 876
 877         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 878
 879         if (wps->state != RECV_M6) {
 880                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 881                            "receiving M6", wps->state);
 882                 wps->state = SEND_WSC_NACK;
 883                 return WPS_CONTINUE;
 884         }
 885
 886         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 887             wps_process_authenticator(wps, attr->authenticator, msg)) {
 888                 wps->state = SEND_WSC_NACK;
 889                 return WPS_CONTINUE;
 890         }
 891
 892         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 893                                               attr->encr_settings_len);
 894         if (decrypted == NULL) {
 895                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 896                            "Settings attribute");
 897                 wps->state = SEND_WSC_NACK;
 898                 return WPS_CONTINUE;
 899         }
 900
 901         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 902                    "attribute");
 903         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 904             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 905             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 906                 wpabuf_free(decrypted);
 907                 wps->state = SEND_WSC_NACK;
 908                 return WPS_CONTINUE;
 909         }
 910         wpabuf_free(decrypted);
 911
 912         wps->state = SEND_M7;
 913         return WPS_CONTINUE;
 914 }
 915
 916
 917 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 918                                            const struct wpabuf *msg,
 919                                            struct wps_parse_attr *attr)
 920 {
 921         struct wpabuf *decrypted;
 922         struct wps_parse_attr eattr;
 923
 924         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 925
 926         if (wps->state != RECV_M8) {
 927                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 928                            "receiving M8", wps->state);
 929                 wps->state = SEND_WSC_NACK;
 930                 return WPS_CONTINUE;
 931         }
 932
 933         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 934             wps_process_authenticator(wps, attr->authenticator, msg)) {
 935                 wps->state = SEND_WSC_NACK;
 936                 return WPS_CONTINUE;
 937         }
 938
 939         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 940                                               attr->encr_settings_len);
 941         if (decrypted == NULL) {
 942                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 943                            "Settings attribute");
 944                 wps->state = SEND_WSC_NACK;
 945                 return WPS_CONTINUE;
 946         }
 947
 948         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 949                    "attribute");
 950         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 951             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 952             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 953                               eattr.num_cred) ||
 954             wps_process_ap_settings_e(wps, &eattr, decrypted)) {
 955                 wpabuf_free(decrypted);
 956                 wps->state = SEND_WSC_NACK;
 957                 return WPS_CONTINUE;
 958         }
 959         wpabuf_free(decrypted);
 960
 961         wps->state = WPS_MSG_DONE;
 962         return WPS_CONTINUE;
 963 }
 964
 965
 966 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
 967                                                 const struct wpabuf *msg)
 968 {
 969         struct wps_parse_attr attr;
 970         enum wps_process_res ret = WPS_CONTINUE;
 971
 972         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
 973
 974         if (wps_parse_msg(msg, &attr) < 0)
 975                 return WPS_FAILURE;
 976
 977         if (!wps_version_supported(attr.version)) {
 978                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 979                            attr.version ? *attr.version : 0);
 980                 return WPS_FAILURE;
 981         }
 982
 983         if (attr.enrollee_nonce == NULL ||
 984             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
 985                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
 986                 return WPS_FAILURE;
 987         }
 988
 989         if (attr.msg_type == NULL) {
 990                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
 991                 return WPS_FAILURE;
 992         }
 993
 994         switch (*attr.msg_type) {
 995         case WPS_M2:
 996                 ret = wps_process_m2(wps, msg, &attr);
 997                 break;
 998         case WPS_M2D:
 999                 ret = wps_process_m2d(wps, &attr);
1000                 break;
1001         case WPS_M4:
1002                 ret = wps_process_m4(wps, msg, &attr);
1003                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1004                         wps_fail_event(wps->wps, WPS_M4);
1005                 break;
1006         case WPS_M6:
1007                 ret = wps_process_m6(wps, msg, &attr);
1008                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1009                         wps_fail_event(wps->wps, WPS_M6);
1010                 break;
1011         case WPS_M8:
1012                 ret = wps_process_m8(wps, msg, &attr);
1013                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1014                         wps_fail_event(wps->wps, WPS_M8);
1015                 break;
1016         default:
1017                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1018                            *attr.msg_type);
1019                 return WPS_FAILURE;
1020         }
1021
1022         /*
1023          * Save a copy of the last message for Authenticator derivation if we
1024          * are continuing. However, skip M2D since it is not authenticated and
1025          * neither is the ACK/NACK response frame. This allows the possibly
1026          * following M2 to be processed correctly by using the previously sent
1027          * M1 in Authenticator derivation.
1028          */
1029         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1030                 /* Save a copy of the last message for Authenticator derivation
1031                  */
1032                 wpabuf_free(wps->last_msg);
1033                 wps->last_msg = wpabuf_dup(msg);
1034         }
1035
1036         return ret;
1037 }
1038
1039
1040 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1041                                                 const struct wpabuf *msg)
1042 {
1043         struct wps_parse_attr attr;
1044
1045         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1046
1047         if (wps_parse_msg(msg, &attr) < 0)
1048                 return WPS_FAILURE;
1049
1050         if (!wps_version_supported(attr.version)) {
1051                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1052                            attr.version ? *attr.version : 0);
1053                 return WPS_FAILURE;
1054         }
1055
1056         if (attr.msg_type == NULL) {
1057                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1058                 return WPS_FAILURE;
1059         }
1060
1061         if (*attr.msg_type != WPS_WSC_ACK) {
1062                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1063                            *attr.msg_type);
1064                 return WPS_FAILURE;
1065         }
1066
1067         if (attr.registrar_nonce == NULL ||
1068             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1069         {
1070                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1071                 return WPS_FAILURE;
1072         }
1073
1074         if (attr.enrollee_nonce == NULL ||
1075             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1076                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1077                 return WPS_FAILURE;
1078         }
1079
1080         if (wps->state == RECV_ACK && wps->wps->ap) {
1081                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1082                            "completed successfully");
1083                 wps_success_event(wps->wps);
1084                 wps->state = WPS_FINISHED;
1085                 return WPS_DONE;
1086         }
1087
1088         return WPS_FAILURE;
1089 }
1090
1091
1092 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1093                                                  const struct wpabuf *msg)
1094 {
1095         struct wps_parse_attr attr;
1096
1097         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1098
1099         if (wps_parse_msg(msg, &attr) < 0)
1100                 return WPS_FAILURE;
1101
1102         if (!wps_version_supported(attr.version)) {
1103                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1104                            attr.version ? *attr.version : 0);
1105                 return WPS_FAILURE;
1106         }
1107
1108         if (attr.msg_type == NULL) {
1109                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1110                 return WPS_FAILURE;
1111         }
1112
1113         if (*attr.msg_type != WPS_WSC_NACK) {
1114                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1115                            *attr.msg_type);
1116                 return WPS_FAILURE;
1117         }
1118
1119         if (attr.registrar_nonce == NULL ||
1120             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1121         {
1122                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1123                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1124                             attr.registrar_nonce, WPS_NONCE_LEN);
1125                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1126                             wps->nonce_r, WPS_NONCE_LEN);
1127                 return WPS_FAILURE;
1128         }
1129
1130         if (attr.enrollee_nonce == NULL ||
1131             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1132                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1133                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1134                             attr.enrollee_nonce, WPS_NONCE_LEN);
1135                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1136                             wps->nonce_e, WPS_NONCE_LEN);
1137                 return WPS_FAILURE;
1138         }
1139
1140         if (attr.config_error == NULL) {
1141                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1142                            "in WSC_NACK");
1143                 return WPS_FAILURE;
1144         }
1145
1146         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1147                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1148
1149         switch (wps->state) {
1150         case RECV_M4:
1151                 wps_fail_event(wps->wps, WPS_M3);
1152                 break;
1153         case RECV_M6:
1154                 wps_fail_event(wps->wps, WPS_M5);
1155                 break;
1156         case RECV_M8:
1157                 wps_fail_event(wps->wps, WPS_M7);
1158                 break;
1159         default:
1160                 break;
1161         }
1162
1163         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1164          * Enrollee is Authenticator */
1165         wps->state = SEND_WSC_NACK;
1166
1167         return WPS_FAILURE;
1168 }
1169
1170
1171 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1172                                               enum wsc_op_code op_code,
1173                                               const struct wpabuf *msg)
1174 {
1175
1176         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1177                    "op_code=%d)",
1178                    (unsigned long) wpabuf_len(msg), op_code);
1179
1180         switch (op_code) {
1181         case WSC_MSG:
1182         case WSC_UPnP:
1183                 return wps_process_wsc_msg(wps, msg);
1184         case WSC_ACK:
1185                 return wps_process_wsc_ack(wps, msg);
1186         case WSC_NACK:
1187                 return wps_process_wsc_nack(wps, msg);
1188         default:
1189                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1190                 return WPS_FAILURE;
1191         }
1192 }