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 #ifdef CONFIG_WPS_NFC
 139         methods |= WPS_CONFIG_NFC_INTERFACE;
 140 #endif /* CONFIG_WPS_NFC */
 141         if (wps->pbc)
 142                 methods |= WPS_CONFIG_PUSHBUTTON;
 143
 144         if (wps_build_version(msg) ||
 145             wps_build_msg_type(msg, WPS_M1) ||
 146             wps_build_uuid_e(msg, wps->uuid_e) ||
 147             wps_build_mac_addr(wps, msg) ||
 148             wps_build_enrollee_nonce(wps, msg) ||
 149             wps_build_public_key(wps, msg) ||
 150             wps_build_auth_type_flags(wps, msg) ||
 151             wps_build_encr_type_flags(wps, msg) ||
 152             wps_build_conn_type_flags(wps, msg) ||
 153             wps_build_config_methods(msg, methods) ||
 154             wps_build_wps_state(wps, msg) ||
 155             wps_build_device_attrs(&wps->wps->dev, msg) ||
 156             wps_build_rf_bands(&wps->wps->dev, msg) ||
 157             wps_build_assoc_state(wps, msg) ||
 158             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
 159             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 160             wps_build_os_version(&wps->wps->dev, msg)) {
 161                 wpabuf_free(msg);
 162                 return NULL;
 163         }
 164
 165         wps->state = RECV_M2;
 166         return msg;
 167 }
 168
 169
 170 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 171 {
 172         struct wpabuf *msg;
 173
 174         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 175
 176         if (wps->dev_password == NULL) {
 177                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 178                 return NULL;
 179         }
 180         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 181
 182         msg = wpabuf_alloc(1000);
 183         if (msg == NULL)
 184                 return NULL;
 185
 186         if (wps_build_version(msg) ||
 187             wps_build_msg_type(msg, WPS_M3) ||
 188             wps_build_registrar_nonce(wps, msg) ||
 189             wps_build_e_hash(wps, msg) ||
 190             wps_build_authenticator(wps, msg)) {
 191                 wpabuf_free(msg);
 192                 return NULL;
 193         }
 194
 195         wps->state = RECV_M4;
 196         return msg;
 197 }
 198
 199
 200 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 201 {
 202         struct wpabuf *msg, *plain;
 203
 204         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 205
 206         plain = wpabuf_alloc(200);
 207         if (plain == NULL)
 208                 return NULL;
 209
 210         msg = wpabuf_alloc(1000);
 211         if (msg == NULL) {
 212                 wpabuf_free(plain);
 213                 return NULL;
 214         }
 215
 216         if (wps_build_version(msg) ||
 217             wps_build_msg_type(msg, WPS_M5) ||
 218             wps_build_registrar_nonce(wps, msg) ||
 219             wps_build_e_snonce1(wps, plain) ||
 220             wps_build_key_wrap_auth(wps, plain) ||
 221             wps_build_encr_settings(wps, msg, plain) ||
 222             wps_build_authenticator(wps, msg)) {
 223                 wpabuf_free(plain);
 224                 wpabuf_free(msg);
 225                 return NULL;
 226         }
 227         wpabuf_free(plain);
 228
 229         wps->state = RECV_M6;
 230         return msg;
 231 }
 232
 233
 234 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 235 {
 236         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 237         wpabuf_put_be16(msg, ATTR_SSID);
 238         wpabuf_put_be16(msg, wps->wps->ssid_len);
 239         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 240         return 0;
 241 }
 242
 243
 244 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 245 {
 246         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
 247         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 248         wpabuf_put_be16(msg, 2);
 249         wpabuf_put_be16(msg, wps->wps->auth_types);
 250         return 0;
 251 }
 252
 253
 254 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 255 {
 256         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
 257         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 258         wpabuf_put_be16(msg, 2);
 259         wpabuf_put_be16(msg, wps->wps->encr_types);
 260         return 0;
 261 }
 262
 263
 264 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 265 {
 266         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 267         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 268         wpabuf_put_be16(msg, wps->wps->network_key_len);
 269         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 270         return 0;
 271 }
 272
 273
 274 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 275 {
 276         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 277         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 278         wpabuf_put_be16(msg, ETH_ALEN);
 279         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 280         return 0;
 281 }
 282
 283
 284 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
 285 {
 286         if (wps->wps->ap_settings) {
 287                 wpa_printf(MSG_DEBUG, "WPS:  * AP Settings (pre-configured)");
 288                 wpabuf_put_data(plain, wps->wps->ap_settings,
 289                                 wps->wps->ap_settings_len);
 290                 return 0;
 291         }
 292
 293         return wps_build_cred_ssid(wps, plain) ||
 294                 wps_build_cred_mac_addr(wps, plain) ||
 295                 wps_build_cred_auth_type(wps, plain) ||
 296                 wps_build_cred_encr_type(wps, plain) ||
 297                 wps_build_cred_network_key(wps, plain);
 298 }
 299
 300
 301 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 302 {
 303         struct wpabuf *msg, *plain;
 304
 305         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 306
 307         plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
 308         if (plain == NULL)
 309                 return NULL;
 310
 311         msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
 312         if (msg == NULL) {
 313                 wpabuf_free(plain);
 314                 return NULL;
 315         }
 316
 317         if (wps_build_version(msg) ||
 318             wps_build_msg_type(msg, WPS_M7) ||
 319             wps_build_registrar_nonce(wps, msg) ||
 320             wps_build_e_snonce2(wps, plain) ||
 321             (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
 322             wps_build_key_wrap_auth(wps, plain) ||
 323             wps_build_encr_settings(wps, msg, plain) ||
 324             wps_build_authenticator(wps, msg)) {
 325                 wpabuf_free(plain);
 326                 wpabuf_free(msg);
 327                 return NULL;
 328         }
 329         wpabuf_free(plain);
 330
 331         if (wps->wps->ap && wps->wps->registrar) {
 332                 /*
 333                  * If the Registrar is only learning our current configuration,
 334                  * it may not continue protocol run to successful completion.
 335                  * Store information here to make sure it remains available.
 336                  */
 337                 wps_device_store(wps->wps->registrar, &wps->peer_dev,
 338                                  wps->uuid_r);
 339         }
 340
 341         wps->state = RECV_M8;
 342         return msg;
 343 }
 344
 345
 346 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 347 {
 348         struct wpabuf *msg;
 349
 350         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 351
 352         msg = wpabuf_alloc(1000);
 353         if (msg == NULL)
 354                 return NULL;
 355
 356         if (wps_build_version(msg) ||
 357             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 358             wps_build_enrollee_nonce(wps, msg) ||
 359             wps_build_registrar_nonce(wps, msg)) {
 360                 wpabuf_free(msg);
 361                 return NULL;
 362         }
 363
 364         if (wps->wps->ap)
 365                 wps->state = RECV_ACK;
 366         else {
 367                 wps_success_event(wps->wps);
 368                 wps->state = WPS_FINISHED;
 369         }
 370         return msg;
 371 }
 372
 373
 374 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
 375 {
 376         struct wpabuf *msg;
 377
 378         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
 379
 380         msg = wpabuf_alloc(1000);
 381         if (msg == NULL)
 382                 return NULL;
 383
 384         if (wps_build_version(msg) ||
 385             wps_build_msg_type(msg, WPS_WSC_ACK) ||
 386             wps_build_enrollee_nonce(wps, msg) ||
 387             wps_build_registrar_nonce(wps, msg)) {
 388                 wpabuf_free(msg);
 389                 return NULL;
 390         }
 391
 392         return msg;
 393 }
 394
 395
 396 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
 397 {
 398         struct wpabuf *msg;
 399
 400         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
 401
 402         msg = wpabuf_alloc(1000);
 403         if (msg == NULL)
 404                 return NULL;
 405
 406         if (wps_build_version(msg) ||
 407             wps_build_msg_type(msg, WPS_WSC_NACK) ||
 408             wps_build_enrollee_nonce(wps, msg) ||
 409             wps_build_registrar_nonce(wps, msg) ||
 410             wps_build_config_error(msg, wps->config_error)) {
 411                 wpabuf_free(msg);
 412                 return NULL;
 413         }
 414
 415         return msg;
 416 }
 417
 418
 419 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
 420                                      enum wsc_op_code *op_code)
 421 {
 422         struct wpabuf *msg;
 423
 424         switch (wps->state) {
 425         case SEND_M1:
 426                 msg = wps_build_m1(wps);
 427                 *op_code = WSC_MSG;
 428                 break;
 429         case SEND_M3:
 430                 msg = wps_build_m3(wps);
 431                 *op_code = WSC_MSG;
 432                 break;
 433         case SEND_M5:
 434                 msg = wps_build_m5(wps);
 435                 *op_code = WSC_MSG;
 436                 break;
 437         case SEND_M7:
 438                 msg = wps_build_m7(wps);
 439                 *op_code = WSC_MSG;
 440                 break;
 441         case RECEIVED_M2D:
 442                 if (wps->wps->ap) {
 443                         msg = wps_build_wsc_nack(wps);
 444                         *op_code = WSC_NACK;
 445                         break;
 446                 }
 447                 msg = wps_build_wsc_ack(wps);
 448                 *op_code = WSC_ACK;
 449                 if (msg) {
 450                         /* Another M2/M2D may be received */
 451                         wps->state = RECV_M2;
 452                 }
 453                 break;
 454         case SEND_WSC_NACK:
 455                 msg = wps_build_wsc_nack(wps);
 456                 *op_code = WSC_NACK;
 457                 break;
 458         case WPS_MSG_DONE:
 459                 msg = wps_build_wsc_done(wps);
 460                 *op_code = WSC_Done;
 461                 break;
 462         default:
 463                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 464                            "a message", wps->state);
 465                 msg = NULL;
 466                 break;
 467         }
 468
 469         if (*op_code == WSC_MSG && msg) {
 470                 /* Save a copy of the last message for Authenticator derivation
 471                  */
 472                 wpabuf_free(wps->last_msg);
 473                 wps->last_msg = wpabuf_dup(msg);
 474         }
 475
 476         return msg;
 477 }
 478
 479
 480 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 481 {
 482         if (r_nonce == NULL) {
 483                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 484                 return -1;
 485         }
 486
 487         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 488         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 489                     wps->nonce_r, WPS_NONCE_LEN);
 490
 491         return 0;
 492 }
 493
 494
 495 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 496 {
 497         if (e_nonce == NULL) {
 498                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 499                 return -1;
 500         }
 501
 502         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 503                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 504                 return -1;
 505         }
 506
 507         return 0;
 508 }
 509
 510
 511 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 512 {
 513         if (uuid_r == NULL) {
 514                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 515                 return -1;
 516         }
 517
 518         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 519         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 520
 521         return 0;
 522 }
 523
 524
 525 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 526                               size_t pk_len)
 527 {
 528         if (pk == NULL || pk_len == 0) {
 529                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 530                 return -1;
 531         }
 532
 533 #ifdef CONFIG_WPS_OOB
 534         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
 535             wps->wps->oob_conf.pubkey_hash) {
 536                 const u8 *addr[1];
 537                 u8 hash[WPS_HASH_LEN];
 538
 539                 addr[0] = pk;
 540                 sha256_vector(1, addr, &pk_len, hash);
 541                 if (os_memcmp(hash,
 542                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
 543                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 544                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
 545                         return -1;
 546                 }
 547         }
 548 #endif /* CONFIG_WPS_OOB */
 549
 550         wpabuf_free(wps->dh_pubkey_r);
 551         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 552         if (wps->dh_pubkey_r == NULL)
 553                 return -1;
 554
 555         if (wps_derive_keys(wps) < 0)
 556                 return -1;
 557
 558         if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
 559             wps_derive_mgmt_keys(wps) < 0)
 560                 return -1;
 561
 562         return 0;
 563 }
 564
 565
 566 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 567 {
 568         if (r_hash1 == NULL) {
 569                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 570                 return -1;
 571         }
 572
 573         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 574         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 575
 576         return 0;
 577 }
 578
 579
 580 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 581 {
 582         if (r_hash2 == NULL) {
 583                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 584                 return -1;
 585         }
 586
 587         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 588         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 589
 590         return 0;
 591 }
 592
 593
 594 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 595 {
 596         u8 hash[SHA256_MAC_LEN];
 597         const u8 *addr[4];
 598         size_t len[4];
 599
 600         if (r_snonce1 == NULL) {
 601                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 602                 return -1;
 603         }
 604
 605         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 606                         WPS_SECRET_NONCE_LEN);
 607
 608         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 609         addr[0] = r_snonce1;
 610         len[0] = WPS_SECRET_NONCE_LEN;
 611         addr[1] = wps->psk1;
 612         len[1] = WPS_PSK_LEN;
 613         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 614         len[2] = wpabuf_len(wps->dh_pubkey_e);
 615         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 616         len[3] = wpabuf_len(wps->dh_pubkey_r);
 617         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 618
 619         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 620                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 621                            "not match with the pre-committed value");
 622                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 623                 wps_pwd_auth_fail_event(wps->wps, 1, 1);
 624                 return -1;
 625         }
 626
 627         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 628                    "half of the device password");
 629
 630         return 0;
 631 }
 632
 633
 634 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 635 {
 636         u8 hash[SHA256_MAC_LEN];
 637         const u8 *addr[4];
 638         size_t len[4];
 639
 640         if (r_snonce2 == NULL) {
 641                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 642                 return -1;
 643         }
 644
 645         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 646                         WPS_SECRET_NONCE_LEN);
 647
 648         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 649         addr[0] = r_snonce2;
 650         len[0] = WPS_SECRET_NONCE_LEN;
 651         addr[1] = wps->psk2;
 652         len[1] = WPS_PSK_LEN;
 653         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 654         len[2] = wpabuf_len(wps->dh_pubkey_e);
 655         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 656         len[3] = wpabuf_len(wps->dh_pubkey_r);
 657         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 658
 659         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 660                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 661                            "not match with the pre-committed value");
 662                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 663                 wps_pwd_auth_fail_event(wps->wps, 1, 2);
 664                 return -1;
 665         }
 666
 667         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 668                    "half of the device password");
 669
 670         return 0;
 671 }
 672
 673
 674 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 675                               size_t cred_len)
 676 {
 677         struct wps_parse_attr attr;
 678         struct wpabuf msg;
 679
 680         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 681         os_memset(&wps->cred, 0, sizeof(wps->cred));
 682         wpabuf_set(&msg, cred, cred_len);
 683         if (wps_parse_msg(&msg, &attr) < 0 ||
 684             wps_process_cred(&attr, &wps->cred))
 685                 return -1;
 686
 687         if (wps->wps->cred_cb) {
 688                 wps->cred.cred_attr = cred - 4;
 689                 wps->cred.cred_attr_len = cred_len + 4;
 690                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 691                 wps->cred.cred_attr = NULL;
 692                 wps->cred.cred_attr_len = 0;
 693         }
 694
 695         return 0;
 696 }
 697
 698
 699 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 700                              size_t cred_len[], size_t num_cred)
 701 {
 702         size_t i;
 703
 704         if (wps->wps->ap)
 705                 return 0;
 706
 707         if (num_cred == 0) {
 708                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 709                            "received");
 710                 return -1;
 711         }
 712
 713         for (i = 0; i < num_cred; i++) {
 714                 if (wps_process_cred_e(wps, cred[i], cred_len[i]))
 715                         return -1;
 716         }
 717
 718         return 0;
 719 }
 720
 721
 722 static int wps_process_ap_settings_e(struct wps_data *wps,
 723                                      struct wps_parse_attr *attr,
 724                                      struct wpabuf *attrs)
 725 {
 726         struct wps_credential cred;
 727
 728         if (!wps->wps->ap)
 729                 return 0;
 730
 731         if (wps_process_ap_settings(attr, &cred) < 0)
 732                 return -1;
 733
 734         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 735                    "Registrar");
 736
 737         if (wps->wps->cred_cb) {
 738                 cred.cred_attr = wpabuf_head(attrs);
 739                 cred.cred_attr_len = wpabuf_len(attrs);
 740                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 741         }
 742
 743         return 0;
 744 }
 745
 746
 747 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 748                                            const struct wpabuf *msg,
 749                                            struct wps_parse_attr *attr)
 750 {
 751         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 752
 753         if (wps->state != RECV_M2) {
 754                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 755                            "receiving M2", wps->state);
 756                 wps->state = SEND_WSC_NACK;
 757                 return WPS_CONTINUE;
 758         }
 759
 760         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 761             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 762             wps_process_uuid_r(wps, attr->uuid_r) ||
 763             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 764             wps_process_authenticator(wps, attr->authenticator, msg) ||
 765             wps_process_device_attrs(&wps->peer_dev, attr)) {
 766                 wps->state = SEND_WSC_NACK;
 767                 return WPS_CONTINUE;
 768         }
 769
 770         if (wps->wps->ap && wps->wps->ap_setup_locked) {
 771                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 772                            "registration of a new Registrar");
 773                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 774                 wps->state = SEND_WSC_NACK;
 775                 return WPS_CONTINUE;
 776         }
 777
 778         wps->state = SEND_M3;
 779         return WPS_CONTINUE;
 780 }
 781
 782
 783 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 784                                             struct wps_parse_attr *attr)
 785 {
 786         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 787
 788         if (wps->state != RECV_M2) {
 789                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 790                            "receiving M2D", wps->state);
 791                 wps->state = SEND_WSC_NACK;
 792                 return WPS_CONTINUE;
 793         }
 794
 795         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 796                           attr->manufacturer, attr->manufacturer_len);
 797         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 798                           attr->model_name, attr->model_name_len);
 799         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 800                           attr->model_number, attr->model_number_len);
 801         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 802                           attr->serial_number, attr->serial_number_len);
 803         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 804                           attr->dev_name, attr->dev_name_len);
 805
 806         if (wps->wps->event_cb) {
 807                 union wps_event_data data;
 808                 struct wps_event_m2d *m2d = &data.m2d;
 809                 os_memset(&data, 0, sizeof(data));
 810                 if (attr->config_methods)
 811                         m2d->config_methods =
 812                                 WPA_GET_BE16(attr->config_methods);
 813                 m2d->manufacturer = attr->manufacturer;
 814                 m2d->manufacturer_len = attr->manufacturer_len;
 815                 m2d->model_name = attr->model_name;
 816                 m2d->model_name_len = attr->model_name_len;
 817                 m2d->model_number = attr->model_number;
 818                 m2d->model_number_len = attr->model_number_len;
 819                 m2d->serial_number = attr->serial_number;
 820                 m2d->serial_number_len = attr->serial_number_len;
 821                 m2d->dev_name = attr->dev_name;
 822                 m2d->dev_name_len = attr->dev_name_len;
 823                 m2d->primary_dev_type = attr->primary_dev_type;
 824                 if (attr->config_error)
 825                         m2d->config_error =
 826                                 WPA_GET_BE16(attr->config_error);
 827                 if (attr->dev_password_id)
 828                         m2d->dev_password_id =
 829                                 WPA_GET_BE16(attr->dev_password_id);
 830                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 831         }
 832
 833         wps->state = RECEIVED_M2D;
 834         return WPS_CONTINUE;
 835 }
 836
 837
 838 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 839                                            const struct wpabuf *msg,
 840                                            struct wps_parse_attr *attr)
 841 {
 842         struct wpabuf *decrypted;
 843         struct wps_parse_attr eattr;
 844
 845         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 846
 847         if (wps->state != RECV_M4) {
 848                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 849                            "receiving M4", wps->state);
 850                 wps->state = SEND_WSC_NACK;
 851                 return WPS_CONTINUE;
 852         }
 853
 854         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 855             wps_process_authenticator(wps, attr->authenticator, msg) ||
 856             wps_process_r_hash1(wps, attr->r_hash1) ||
 857             wps_process_r_hash2(wps, attr->r_hash2)) {
 858                 wps->state = SEND_WSC_NACK;
 859                 return WPS_CONTINUE;
 860         }
 861
 862         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 863                                               attr->encr_settings_len);
 864         if (decrypted == NULL) {
 865                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 866                            "Settings attribute");
 867                 wps->state = SEND_WSC_NACK;
 868                 return WPS_CONTINUE;
 869         }
 870
 871         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 872                    "attribute");
 873         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 874             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 875             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 876                 wpabuf_free(decrypted);
 877                 wps->state = SEND_WSC_NACK;
 878                 return WPS_CONTINUE;
 879         }
 880         wpabuf_free(decrypted);
 881
 882         wps->state = SEND_M5;
 883         return WPS_CONTINUE;
 884 }
 885
 886
 887 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 888                                            const struct wpabuf *msg,
 889                                            struct wps_parse_attr *attr)
 890 {
 891         struct wpabuf *decrypted;
 892         struct wps_parse_attr eattr;
 893
 894         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 895
 896         if (wps->state != RECV_M6) {
 897                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 898                            "receiving M6", wps->state);
 899                 wps->state = SEND_WSC_NACK;
 900                 return WPS_CONTINUE;
 901         }
 902
 903         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 904             wps_process_authenticator(wps, attr->authenticator, msg)) {
 905                 wps->state = SEND_WSC_NACK;
 906                 return WPS_CONTINUE;
 907         }
 908
 909         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 910                                               attr->encr_settings_len);
 911         if (decrypted == NULL) {
 912                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 913                            "Settings attribute");
 914                 wps->state = SEND_WSC_NACK;
 915                 return WPS_CONTINUE;
 916         }
 917
 918         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 919                    "attribute");
 920         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 921             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 922             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 923                 wpabuf_free(decrypted);
 924                 wps->state = SEND_WSC_NACK;
 925                 return WPS_CONTINUE;
 926         }
 927         wpabuf_free(decrypted);
 928
 929         wps->state = SEND_M7;
 930         return WPS_CONTINUE;
 931 }
 932
 933
 934 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 935                                            const struct wpabuf *msg,
 936                                            struct wps_parse_attr *attr)
 937 {
 938         struct wpabuf *decrypted;
 939         struct wps_parse_attr eattr;
 940
 941         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 942
 943         if (wps->state != RECV_M8) {
 944                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 945                            "receiving M8", wps->state);
 946                 wps->state = SEND_WSC_NACK;
 947                 return WPS_CONTINUE;
 948         }
 949
 950         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 951             wps_process_authenticator(wps, attr->authenticator, msg)) {
 952                 wps->state = SEND_WSC_NACK;
 953                 return WPS_CONTINUE;
 954         }
 955
 956         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 957                                               attr->encr_settings_len);
 958         if (decrypted == NULL) {
 959                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 960                            "Settings attribute");
 961                 wps->state = SEND_WSC_NACK;
 962                 return WPS_CONTINUE;
 963         }
 964
 965         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 966                    "attribute");
 967         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 968             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 969             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 970                               eattr.num_cred) ||
 971             wps_process_ap_settings_e(wps, &eattr, decrypted)) {
 972                 wpabuf_free(decrypted);
 973                 wps->state = SEND_WSC_NACK;
 974                 return WPS_CONTINUE;
 975         }
 976         wpabuf_free(decrypted);
 977
 978         wps->state = WPS_MSG_DONE;
 979         return WPS_CONTINUE;
 980 }
 981
 982
 983 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
 984                                                 const struct wpabuf *msg)
 985 {
 986         struct wps_parse_attr attr;
 987         enum wps_process_res ret = WPS_CONTINUE;
 988
 989         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
 990
 991         if (wps_parse_msg(msg, &attr) < 0)
 992                 return WPS_FAILURE;
 993
 994         if (!wps_version_supported(attr.version)) {
 995                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 996                            attr.version ? *attr.version : 0);
 997                 return WPS_FAILURE;
 998         }
 999
1000         if (attr.enrollee_nonce == NULL ||
1001             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1002                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1003                 return WPS_FAILURE;
1004         }
1005
1006         if (attr.msg_type == NULL) {
1007                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1008                 return WPS_FAILURE;
1009         }
1010
1011         switch (*attr.msg_type) {
1012         case WPS_M2:
1013                 ret = wps_process_m2(wps, msg, &attr);
1014                 break;
1015         case WPS_M2D:
1016                 ret = wps_process_m2d(wps, &attr);
1017                 break;
1018         case WPS_M4:
1019                 ret = wps_process_m4(wps, msg, &attr);
1020                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1021                         wps_fail_event(wps->wps, WPS_M4);
1022                 break;
1023         case WPS_M6:
1024                 ret = wps_process_m6(wps, msg, &attr);
1025                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1026                         wps_fail_event(wps->wps, WPS_M6);
1027                 break;
1028         case WPS_M8:
1029                 ret = wps_process_m8(wps, msg, &attr);
1030                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1031                         wps_fail_event(wps->wps, WPS_M8);
1032                 break;
1033         default:
1034                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1035                            *attr.msg_type);
1036                 return WPS_FAILURE;
1037         }
1038
1039         /*
1040          * Save a copy of the last message for Authenticator derivation if we
1041          * are continuing. However, skip M2D since it is not authenticated and
1042          * neither is the ACK/NACK response frame. This allows the possibly
1043          * following M2 to be processed correctly by using the previously sent
1044          * M1 in Authenticator derivation.
1045          */
1046         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1047                 /* Save a copy of the last message for Authenticator derivation
1048                  */
1049                 wpabuf_free(wps->last_msg);
1050                 wps->last_msg = wpabuf_dup(msg);
1051         }
1052
1053         return ret;
1054 }
1055
1056
1057 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1058                                                 const struct wpabuf *msg)
1059 {
1060         struct wps_parse_attr attr;
1061
1062         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1063
1064         if (wps_parse_msg(msg, &attr) < 0)
1065                 return WPS_FAILURE;
1066
1067         if (!wps_version_supported(attr.version)) {
1068                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1069                            attr.version ? *attr.version : 0);
1070                 return WPS_FAILURE;
1071         }
1072
1073         if (attr.msg_type == NULL) {
1074                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1075                 return WPS_FAILURE;
1076         }
1077
1078         if (*attr.msg_type != WPS_WSC_ACK) {
1079                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1080                            *attr.msg_type);
1081                 return WPS_FAILURE;
1082         }
1083
1084         if (attr.registrar_nonce == NULL ||
1085             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1086         {
1087                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1088                 return WPS_FAILURE;
1089         }
1090
1091         if (attr.enrollee_nonce == NULL ||
1092             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1093                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1094                 return WPS_FAILURE;
1095         }
1096
1097         if (wps->state == RECV_ACK && wps->wps->ap) {
1098                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1099                            "completed successfully");
1100                 wps_success_event(wps->wps);
1101                 wps->state = WPS_FINISHED;
1102                 return WPS_DONE;
1103         }
1104
1105         return WPS_FAILURE;
1106 }
1107
1108
1109 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1110                                                  const struct wpabuf *msg)
1111 {
1112         struct wps_parse_attr attr;
1113
1114         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1115
1116         if (wps_parse_msg(msg, &attr) < 0)
1117                 return WPS_FAILURE;
1118
1119         if (!wps_version_supported(attr.version)) {
1120                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1121                            attr.version ? *attr.version : 0);
1122                 return WPS_FAILURE;
1123         }
1124
1125         if (attr.msg_type == NULL) {
1126                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1127                 return WPS_FAILURE;
1128         }
1129
1130         if (*attr.msg_type != WPS_WSC_NACK) {
1131                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1132                            *attr.msg_type);
1133                 return WPS_FAILURE;
1134         }
1135
1136         if (attr.registrar_nonce == NULL ||
1137             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1138         {
1139                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1140                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1141                             attr.registrar_nonce, WPS_NONCE_LEN);
1142                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1143                             wps->nonce_r, WPS_NONCE_LEN);
1144                 return WPS_FAILURE;
1145         }
1146
1147         if (attr.enrollee_nonce == NULL ||
1148             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1149                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1150                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1151                             attr.enrollee_nonce, WPS_NONCE_LEN);
1152                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1153                             wps->nonce_e, WPS_NONCE_LEN);
1154                 return WPS_FAILURE;
1155         }
1156
1157         if (attr.config_error == NULL) {
1158                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1159                            "in WSC_NACK");
1160                 return WPS_FAILURE;
1161         }
1162
1163         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1164                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1165
1166         switch (wps->state) {
1167         case RECV_M4:
1168                 wps_fail_event(wps->wps, WPS_M3);
1169                 break;
1170         case RECV_M6:
1171                 wps_fail_event(wps->wps, WPS_M5);
1172                 break;
1173         case RECV_M8:
1174                 wps_fail_event(wps->wps, WPS_M7);
1175                 break;
1176         default:
1177                 break;
1178         }
1179
1180         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1181          * Enrollee is Authenticator */
1182         wps->state = SEND_WSC_NACK;
1183
1184         return WPS_FAILURE;
1185 }
1186
1187
1188 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1189                                               enum wsc_op_code op_code,
1190                                               const struct wpabuf *msg)
1191 {
1192
1193         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1194                    "op_code=%d)",
1195                    (unsigned long) wpabuf_len(msg), op_code);
1196
1197         switch (op_code) {
1198         case WSC_MSG:
1199         case WSC_UPnP:
1200                 return wps_process_wsc_msg(wps, msg);
1201         case WSC_ACK:
1202                 return wps_process_wsc_ack(wps, msg);
1203         case WSC_NACK:
1204                 return wps_process_wsc_nack(wps, msg);
1205         default:
1206                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1207                 return WPS_FAILURE;
1208         }
1209 }