contrib/wpa/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 "crypto/crypto.h"
  19 #include "crypto/sha256.h"
  20 #include "wps_i.h"
  21 #include "wps_dev_attr.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
 123         if (os_get_random(wps->nonce_e, WPS_NONCE_LEN) < 0)
 124                 return NULL;
 125         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
 126                     wps->nonce_e, WPS_NONCE_LEN);
 127
 128         wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
 129         msg = wpabuf_alloc(1000);
 130         if (msg == NULL)
 131                 return NULL;
 132
 133         if (wps_build_version(msg) ||
 134             wps_build_msg_type(msg, WPS_M1) ||
 135             wps_build_uuid_e(msg, wps->uuid_e) ||
 136             wps_build_mac_addr(wps, msg) ||
 137             wps_build_enrollee_nonce(wps, msg) ||
 138             wps_build_public_key(wps, msg) ||
 139             wps_build_auth_type_flags(wps, msg) ||
 140             wps_build_encr_type_flags(wps, msg) ||
 141             wps_build_conn_type_flags(wps, msg) ||
 142             wps_build_config_methods(msg, wps->wps->config_methods) ||
 143             wps_build_wps_state(wps, msg) ||
 144             wps_build_device_attrs(&wps->wps->dev, msg) ||
 145             wps_build_rf_bands(&wps->wps->dev, msg) ||
 146             wps_build_assoc_state(wps, msg) ||
 147             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
 148             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 149             wps_build_os_version(&wps->wps->dev, msg)) {
 150                 wpabuf_free(msg);
 151                 return NULL;
 152         }
 153
 154         wps->state = RECV_M2;
 155         return msg;
 156 }
 157
 158
 159 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 160 {
 161         struct wpabuf *msg;
 162
 163         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 164
 165         if (wps->dev_password == NULL) {
 166                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 167                 return NULL;
 168         }
 169         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 170
 171         msg = wpabuf_alloc(1000);
 172         if (msg == NULL)
 173                 return NULL;
 174
 175         if (wps_build_version(msg) ||
 176             wps_build_msg_type(msg, WPS_M3) ||
 177             wps_build_registrar_nonce(wps, msg) ||
 178             wps_build_e_hash(wps, msg) ||
 179             wps_build_authenticator(wps, msg)) {
 180                 wpabuf_free(msg);
 181                 return NULL;
 182         }
 183
 184         wps->state = RECV_M4;
 185         return msg;
 186 }
 187
 188
 189 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 190 {
 191         struct wpabuf *msg, *plain;
 192
 193         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 194
 195         plain = wpabuf_alloc(200);
 196         if (plain == NULL)
 197                 return NULL;
 198
 199         msg = wpabuf_alloc(1000);
 200         if (msg == NULL) {
 201                 wpabuf_free(plain);
 202                 return NULL;
 203         }
 204
 205         if (wps_build_version(msg) ||
 206             wps_build_msg_type(msg, WPS_M5) ||
 207             wps_build_registrar_nonce(wps, msg) ||
 208             wps_build_e_snonce1(wps, plain) ||
 209             wps_build_key_wrap_auth(wps, plain) ||
 210             wps_build_encr_settings(wps, msg, plain) ||
 211             wps_build_authenticator(wps, msg)) {
 212                 wpabuf_free(plain);
 213                 wpabuf_free(msg);
 214                 return NULL;
 215         }
 216         wpabuf_free(plain);
 217
 218         wps->state = RECV_M6;
 219         return msg;
 220 }
 221
 222
 223 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 224 {
 225         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 226         wpabuf_put_be16(msg, ATTR_SSID);
 227         wpabuf_put_be16(msg, wps->wps->ssid_len);
 228         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 229         return 0;
 230 }
 231
 232
 233 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 234 {
 235         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
 236         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 237         wpabuf_put_be16(msg, 2);
 238         wpabuf_put_be16(msg, wps->wps->auth_types);
 239         return 0;
 240 }
 241
 242
 243 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 244 {
 245         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
 246         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 247         wpabuf_put_be16(msg, 2);
 248         wpabuf_put_be16(msg, wps->wps->encr_types);
 249         return 0;
 250 }
 251
 252
 253 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 254 {
 255         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 256         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 257         wpabuf_put_be16(msg, wps->wps->network_key_len);
 258         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 259         return 0;
 260 }
 261
 262
 263 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 264 {
 265         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 266         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 267         wpabuf_put_be16(msg, ETH_ALEN);
 268         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 269         return 0;
 270 }
 271
 272
 273 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
 274 {
 275         if (wps->wps->ap_settings) {
 276                 wpa_printf(MSG_DEBUG, "WPS:  * AP Settings (pre-configured)");
 277                 wpabuf_put_data(plain, wps->wps->ap_settings,
 278                                 wps->wps->ap_settings_len);
 279                 return 0;
 280         }
 281
 282         return wps_build_cred_ssid(wps, plain) ||
 283                 wps_build_cred_mac_addr(wps, plain) ||
 284                 wps_build_cred_auth_type(wps, plain) ||
 285                 wps_build_cred_encr_type(wps, plain) ||
 286                 wps_build_cred_network_key(wps, plain);
 287 }
 288
 289
 290 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 291 {
 292         struct wpabuf *msg, *plain;
 293
 294         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 295
 296         plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
 297         if (plain == NULL)
 298                 return NULL;
 299
 300         msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
 301         if (msg == NULL) {
 302                 wpabuf_free(plain);
 303                 return NULL;
 304         }
 305
 306         if (wps_build_version(msg) ||
 307             wps_build_msg_type(msg, WPS_M7) ||
 308             wps_build_registrar_nonce(wps, msg) ||
 309             wps_build_e_snonce2(wps, plain) ||
 310             (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
 311             wps_build_key_wrap_auth(wps, plain) ||
 312             wps_build_encr_settings(wps, msg, plain) ||
 313             wps_build_authenticator(wps, msg)) {
 314                 wpabuf_free(plain);
 315                 wpabuf_free(msg);
 316                 return NULL;
 317         }
 318         wpabuf_free(plain);
 319
 320         if (wps->wps->ap && wps->wps->registrar) {
 321                 /*
 322                  * If the Registrar is only learning our current configuration,
 323                  * it may not continue protocol run to successful completion.
 324                  * Store information here to make sure it remains available.
 325                  */
 326                 wps_device_store(wps->wps->registrar, &wps->peer_dev,
 327                                  wps->uuid_r);
 328         }
 329
 330         wps->state = RECV_M8;
 331         return msg;
 332 }
 333
 334
 335 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 336 {
 337         struct wpabuf *msg;
 338
 339         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 340
 341         msg = wpabuf_alloc(1000);
 342         if (msg == NULL)
 343                 return NULL;
 344
 345         if (wps_build_version(msg) ||
 346             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 347             wps_build_enrollee_nonce(wps, msg) ||
 348             wps_build_registrar_nonce(wps, msg)) {
 349                 wpabuf_free(msg);
 350                 return NULL;
 351         }
 352
 353         if (wps->wps->ap)
 354                 wps->state = RECV_ACK;
 355         else {
 356                 wps_success_event(wps->wps);
 357                 wps->state = WPS_FINISHED;
 358         }
 359         return msg;
 360 }
 361
 362
 363 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
 364 {
 365         struct wpabuf *msg;
 366
 367         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
 368
 369         msg = wpabuf_alloc(1000);
 370         if (msg == NULL)
 371                 return NULL;
 372
 373         if (wps_build_version(msg) ||
 374             wps_build_msg_type(msg, WPS_WSC_ACK) ||
 375             wps_build_enrollee_nonce(wps, msg) ||
 376             wps_build_registrar_nonce(wps, msg)) {
 377                 wpabuf_free(msg);
 378                 return NULL;
 379         }
 380
 381         return msg;
 382 }
 383
 384
 385 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
 386 {
 387         struct wpabuf *msg;
 388
 389         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
 390
 391         msg = wpabuf_alloc(1000);
 392         if (msg == NULL)
 393                 return NULL;
 394
 395         if (wps_build_version(msg) ||
 396             wps_build_msg_type(msg, WPS_WSC_NACK) ||
 397             wps_build_enrollee_nonce(wps, msg) ||
 398             wps_build_registrar_nonce(wps, msg) ||
 399             wps_build_config_error(msg, wps->config_error)) {
 400                 wpabuf_free(msg);
 401                 return NULL;
 402         }
 403
 404         return msg;
 405 }
 406
 407
 408 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
 409                                      enum wsc_op_code *op_code)
 410 {
 411         struct wpabuf *msg;
 412
 413         switch (wps->state) {
 414         case SEND_M1:
 415                 msg = wps_build_m1(wps);
 416                 *op_code = WSC_MSG;
 417                 break;
 418         case SEND_M3:
 419                 msg = wps_build_m3(wps);
 420                 *op_code = WSC_MSG;
 421                 break;
 422         case SEND_M5:
 423                 msg = wps_build_m5(wps);
 424                 *op_code = WSC_MSG;
 425                 break;
 426         case SEND_M7:
 427                 msg = wps_build_m7(wps);
 428                 *op_code = WSC_MSG;
 429                 break;
 430         case RECEIVED_M2D:
 431                 if (wps->wps->ap) {
 432                         msg = wps_build_wsc_nack(wps);
 433                         *op_code = WSC_NACK;
 434                         break;
 435                 }
 436                 msg = wps_build_wsc_ack(wps);
 437                 *op_code = WSC_ACK;
 438                 if (msg) {
 439                         /* Another M2/M2D may be received */
 440                         wps->state = RECV_M2;
 441                 }
 442                 break;
 443         case SEND_WSC_NACK:
 444                 msg = wps_build_wsc_nack(wps);
 445                 *op_code = WSC_NACK;
 446                 break;
 447         case WPS_MSG_DONE:
 448                 msg = wps_build_wsc_done(wps);
 449                 *op_code = WSC_Done;
 450                 break;
 451         default:
 452                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 453                            "a message", wps->state);
 454                 msg = NULL;
 455                 break;
 456         }
 457
 458         if (*op_code == WSC_MSG && msg) {
 459                 /* Save a copy of the last message for Authenticator derivation
 460                  */
 461                 wpabuf_free(wps->last_msg);
 462                 wps->last_msg = wpabuf_dup(msg);
 463         }
 464
 465         return msg;
 466 }
 467
 468
 469 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 470 {
 471         if (r_nonce == NULL) {
 472                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 473                 return -1;
 474         }
 475
 476         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 477         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 478                     wps->nonce_r, WPS_NONCE_LEN);
 479
 480         return 0;
 481 }
 482
 483
 484 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 485 {
 486         if (e_nonce == NULL) {
 487                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 488                 return -1;
 489         }
 490
 491         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 492                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 493                 return -1;
 494         }
 495
 496         return 0;
 497 }
 498
 499
 500 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 501 {
 502         if (uuid_r == NULL) {
 503                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 504                 return -1;
 505         }
 506
 507         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 508         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 509
 510         return 0;
 511 }
 512
 513
 514 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 515                               size_t pk_len)
 516 {
 517         if (pk == NULL || pk_len == 0) {
 518                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 519                 return -1;
 520         }
 521
 522 #ifdef CONFIG_WPS_OOB
 523         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
 524             wps->wps->oob_conf.pubkey_hash) {
 525                 const u8 *addr[1];
 526                 u8 hash[WPS_HASH_LEN];
 527
 528                 addr[0] = pk;
 529                 sha256_vector(1, addr, &pk_len, hash);
 530                 if (os_memcmp(hash,
 531                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
 532                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 533                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
 534                         return -1;
 535                 }
 536         }
 537 #endif /* CONFIG_WPS_OOB */
 538
 539         wpabuf_free(wps->dh_pubkey_r);
 540         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 541         if (wps->dh_pubkey_r == NULL)
 542                 return -1;
 543
 544         if (wps_derive_keys(wps) < 0)
 545                 return -1;
 546
 547         return 0;
 548 }
 549
 550
 551 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 552 {
 553         if (r_hash1 == NULL) {
 554                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 555                 return -1;
 556         }
 557
 558         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 559         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 560
 561         return 0;
 562 }
 563
 564
 565 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 566 {
 567         if (r_hash2 == NULL) {
 568                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 569                 return -1;
 570         }
 571
 572         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 573         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 574
 575         return 0;
 576 }
 577
 578
 579 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 580 {
 581         u8 hash[SHA256_MAC_LEN];
 582         const u8 *addr[4];
 583         size_t len[4];
 584
 585         if (r_snonce1 == NULL) {
 586                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 587                 return -1;
 588         }
 589
 590         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 591                         WPS_SECRET_NONCE_LEN);
 592
 593         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 594         addr[0] = r_snonce1;
 595         len[0] = WPS_SECRET_NONCE_LEN;
 596         addr[1] = wps->psk1;
 597         len[1] = WPS_PSK_LEN;
 598         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 599         len[2] = wpabuf_len(wps->dh_pubkey_e);
 600         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 601         len[3] = wpabuf_len(wps->dh_pubkey_r);
 602         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 603
 604         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 605                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 606                            "not match with the pre-committed value");
 607                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 608                 wps_pwd_auth_fail_event(wps->wps, 1, 1);
 609                 return -1;
 610         }
 611
 612         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 613                    "half of the device password");
 614
 615         return 0;
 616 }
 617
 618
 619 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 620 {
 621         u8 hash[SHA256_MAC_LEN];
 622         const u8 *addr[4];
 623         size_t len[4];
 624
 625         if (r_snonce2 == NULL) {
 626                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 627                 return -1;
 628         }
 629
 630         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 631                         WPS_SECRET_NONCE_LEN);
 632
 633         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 634         addr[0] = r_snonce2;
 635         len[0] = WPS_SECRET_NONCE_LEN;
 636         addr[1] = wps->psk2;
 637         len[1] = WPS_PSK_LEN;
 638         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 639         len[2] = wpabuf_len(wps->dh_pubkey_e);
 640         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 641         len[3] = wpabuf_len(wps->dh_pubkey_r);
 642         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 643
 644         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 645                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 646                            "not match with the pre-committed value");
 647                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 648                 wps_pwd_auth_fail_event(wps->wps, 1, 2);
 649                 return -1;
 650         }
 651
 652         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 653                    "half of the device password");
 654
 655         return 0;
 656 }
 657
 658
 659 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 660                               size_t cred_len)
 661 {
 662         struct wps_parse_attr attr;
 663         struct wpabuf msg;
 664
 665         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 666         os_memset(&wps->cred, 0, sizeof(wps->cred));
 667         wpabuf_set(&msg, cred, cred_len);
 668         if (wps_parse_msg(&msg, &attr) < 0 ||
 669             wps_process_cred(&attr, &wps->cred))
 670                 return -1;
 671
 672         if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 673             0) {
 674                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
 675                            MACSTR ") does not match with own address (" MACSTR
 676                            ")", MAC2STR(wps->cred.mac_addr),
 677                            MAC2STR(wps->wps->dev.mac_addr));
 678                 /*
 679                  * In theory, this could be consider fatal error, but there are
 680                  * number of deployed implementations using other address here
 681                  * due to unclarity in the specification. For interoperability
 682                  * reasons, allow this to be processed since we do not really
 683                  * use the MAC Address information for anything.
 684                  */
 685         }
 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 (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 738             0) {
 739                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
 740                            MACSTR ") does not match with own address (" MACSTR
 741                            ")", MAC2STR(cred.mac_addr),
 742                            MAC2STR(wps->wps->dev.mac_addr));
 743                 /*
 744                  * In theory, this could be consider fatal error, but there are
 745                  * number of deployed implementations using other address here
 746                  * due to unclarity in the specification. For interoperability
 747                  * reasons, allow this to be processed since we do not really
 748                  * use the MAC Address information for anything.
 749                  */
 750         }
 751
 752         if (wps->wps->cred_cb) {
 753                 cred.cred_attr = wpabuf_head(attrs);
 754                 cred.cred_attr_len = wpabuf_len(attrs);
 755                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 756         }
 757
 758         return 0;
 759 }
 760
 761
 762 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 763                                            const struct wpabuf *msg,
 764                                            struct wps_parse_attr *attr)
 765 {
 766         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 767
 768         if (wps->state != RECV_M2) {
 769                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 770                            "receiving M2", wps->state);
 771                 wps->state = SEND_WSC_NACK;
 772                 return WPS_CONTINUE;
 773         }
 774
 775         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 776             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 777             wps_process_uuid_r(wps, attr->uuid_r)) {
 778                 wps->state = SEND_WSC_NACK;
 779                 return WPS_CONTINUE;
 780         }
 781
 782         if (wps->wps->ap &&
 783             (wps->wps->ap_setup_locked || wps->dev_password == NULL)) {
 784                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 785                            "registration of a new Registrar");
 786                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 787                 wps->state = SEND_WSC_NACK;
 788                 return WPS_CONTINUE;
 789         }
 790
 791         if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 792             wps_process_authenticator(wps, attr->authenticator, msg) ||
 793             wps_process_device_attrs(&wps->peer_dev, attr)) {
 794                 wps->state = SEND_WSC_NACK;
 795                 return WPS_CONTINUE;
 796         }
 797
 798         wps->state = SEND_M3;
 799         return WPS_CONTINUE;
 800 }
 801
 802
 803 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 804                                             struct wps_parse_attr *attr)
 805 {
 806         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 807
 808         if (wps->state != RECV_M2) {
 809                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 810                            "receiving M2D", wps->state);
 811                 wps->state = SEND_WSC_NACK;
 812                 return WPS_CONTINUE;
 813         }
 814
 815         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 816                           attr->manufacturer, attr->manufacturer_len);
 817         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 818                           attr->model_name, attr->model_name_len);
 819         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 820                           attr->model_number, attr->model_number_len);
 821         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 822                           attr->serial_number, attr->serial_number_len);
 823         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 824                           attr->dev_name, attr->dev_name_len);
 825
 826         if (wps->wps->event_cb) {
 827                 union wps_event_data data;
 828                 struct wps_event_m2d *m2d = &data.m2d;
 829                 os_memset(&data, 0, sizeof(data));
 830                 if (attr->config_methods)
 831                         m2d->config_methods =
 832                                 WPA_GET_BE16(attr->config_methods);
 833                 m2d->manufacturer = attr->manufacturer;
 834                 m2d->manufacturer_len = attr->manufacturer_len;
 835                 m2d->model_name = attr->model_name;
 836                 m2d->model_name_len = attr->model_name_len;
 837                 m2d->model_number = attr->model_number;
 838                 m2d->model_number_len = attr->model_number_len;
 839                 m2d->serial_number = attr->serial_number;
 840                 m2d->serial_number_len = attr->serial_number_len;
 841                 m2d->dev_name = attr->dev_name;
 842                 m2d->dev_name_len = attr->dev_name_len;
 843                 m2d->primary_dev_type = attr->primary_dev_type;
 844                 if (attr->config_error)
 845                         m2d->config_error =
 846                                 WPA_GET_BE16(attr->config_error);
 847                 if (attr->dev_password_id)
 848                         m2d->dev_password_id =
 849                                 WPA_GET_BE16(attr->dev_password_id);
 850                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 851         }
 852
 853         wps->state = RECEIVED_M2D;
 854         return WPS_CONTINUE;
 855 }
 856
 857
 858 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 859                                            const struct wpabuf *msg,
 860                                            struct wps_parse_attr *attr)
 861 {
 862         struct wpabuf *decrypted;
 863         struct wps_parse_attr eattr;
 864
 865         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 866
 867         if (wps->state != RECV_M4) {
 868                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 869                            "receiving M4", wps->state);
 870                 wps->state = SEND_WSC_NACK;
 871                 return WPS_CONTINUE;
 872         }
 873
 874         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 875             wps_process_authenticator(wps, attr->authenticator, msg) ||
 876             wps_process_r_hash1(wps, attr->r_hash1) ||
 877             wps_process_r_hash2(wps, attr->r_hash2)) {
 878                 wps->state = SEND_WSC_NACK;
 879                 return WPS_CONTINUE;
 880         }
 881
 882         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 883                                               attr->encr_settings_len);
 884         if (decrypted == NULL) {
 885                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 886                            "Settings attribute");
 887                 wps->state = SEND_WSC_NACK;
 888                 return WPS_CONTINUE;
 889         }
 890
 891         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 892                    "attribute");
 893         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 894             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 895             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 896                 wpabuf_free(decrypted);
 897                 wps->state = SEND_WSC_NACK;
 898                 return WPS_CONTINUE;
 899         }
 900         wpabuf_free(decrypted);
 901
 902         wps->state = SEND_M5;
 903         return WPS_CONTINUE;
 904 }
 905
 906
 907 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 908                                            const struct wpabuf *msg,
 909                                            struct wps_parse_attr *attr)
 910 {
 911         struct wpabuf *decrypted;
 912         struct wps_parse_attr eattr;
 913
 914         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 915
 916         if (wps->state != RECV_M6) {
 917                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 918                            "receiving M6", wps->state);
 919                 wps->state = SEND_WSC_NACK;
 920                 return WPS_CONTINUE;
 921         }
 922
 923         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 924             wps_process_authenticator(wps, attr->authenticator, msg)) {
 925                 wps->state = SEND_WSC_NACK;
 926                 return WPS_CONTINUE;
 927         }
 928
 929         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 930                                               attr->encr_settings_len);
 931         if (decrypted == NULL) {
 932                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 933                            "Settings attribute");
 934                 wps->state = SEND_WSC_NACK;
 935                 return WPS_CONTINUE;
 936         }
 937
 938         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 939                    "attribute");
 940         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 941             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 942             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 943                 wpabuf_free(decrypted);
 944                 wps->state = SEND_WSC_NACK;
 945                 return WPS_CONTINUE;
 946         }
 947         wpabuf_free(decrypted);
 948
 949         wps->state = SEND_M7;
 950         return WPS_CONTINUE;
 951 }
 952
 953
 954 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 955                                            const struct wpabuf *msg,
 956                                            struct wps_parse_attr *attr)
 957 {
 958         struct wpabuf *decrypted;
 959         struct wps_parse_attr eattr;
 960
 961         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 962
 963         if (wps->state != RECV_M8) {
 964                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 965                            "receiving M8", wps->state);
 966                 wps->state = SEND_WSC_NACK;
 967                 return WPS_CONTINUE;
 968         }
 969
 970         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 971             wps_process_authenticator(wps, attr->authenticator, msg)) {
 972                 wps->state = SEND_WSC_NACK;
 973                 return WPS_CONTINUE;
 974         }
 975
 976         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 977                                               attr->encr_settings_len);
 978         if (decrypted == NULL) {
 979                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 980                            "Settings attribute");
 981                 wps->state = SEND_WSC_NACK;
 982                 return WPS_CONTINUE;
 983         }
 984
 985         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 986                    "attribute");
 987         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 988             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 989             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 990                               eattr.num_cred) ||
 991             wps_process_ap_settings_e(wps, &eattr, decrypted)) {
 992                 wpabuf_free(decrypted);
 993                 wps->state = SEND_WSC_NACK;
 994                 return WPS_CONTINUE;
 995         }
 996         wpabuf_free(decrypted);
 997
 998         wps->state = WPS_MSG_DONE;
 999         return WPS_CONTINUE;
1000 }
1001
1002
1003 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1004                                                 const struct wpabuf *msg)
1005 {
1006         struct wps_parse_attr attr;
1007         enum wps_process_res ret = WPS_CONTINUE;
1008
1009         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1010
1011         if (wps_parse_msg(msg, &attr) < 0)
1012                 return WPS_FAILURE;
1013
1014         if (!wps_version_supported(attr.version)) {
1015                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1016                            attr.version ? *attr.version : 0);
1017                 return WPS_FAILURE;
1018         }
1019
1020         if (attr.enrollee_nonce == NULL ||
1021             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1022                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1023                 return WPS_FAILURE;
1024         }
1025
1026         if (attr.msg_type == NULL) {
1027                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1028                 return WPS_FAILURE;
1029         }
1030
1031         switch (*attr.msg_type) {
1032         case WPS_M2:
1033                 ret = wps_process_m2(wps, msg, &attr);
1034                 break;
1035         case WPS_M2D:
1036                 ret = wps_process_m2d(wps, &attr);
1037                 break;
1038         case WPS_M4:
1039                 ret = wps_process_m4(wps, msg, &attr);
1040                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1041                         wps_fail_event(wps->wps, WPS_M4);
1042                 break;
1043         case WPS_M6:
1044                 ret = wps_process_m6(wps, msg, &attr);
1045                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1046                         wps_fail_event(wps->wps, WPS_M6);
1047                 break;
1048         case WPS_M8:
1049                 ret = wps_process_m8(wps, msg, &attr);
1050                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1051                         wps_fail_event(wps->wps, WPS_M8);
1052                 break;
1053         default:
1054                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1055                            *attr.msg_type);
1056                 return WPS_FAILURE;
1057         }
1058
1059         /*
1060          * Save a copy of the last message for Authenticator derivation if we
1061          * are continuing. However, skip M2D since it is not authenticated and
1062          * neither is the ACK/NACK response frame. This allows the possibly
1063          * following M2 to be processed correctly by using the previously sent
1064          * M1 in Authenticator derivation.
1065          */
1066         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1067                 /* Save a copy of the last message for Authenticator derivation
1068                  */
1069                 wpabuf_free(wps->last_msg);
1070                 wps->last_msg = wpabuf_dup(msg);
1071         }
1072
1073         return ret;
1074 }
1075
1076
1077 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1078                                                 const struct wpabuf *msg)
1079 {
1080         struct wps_parse_attr attr;
1081
1082         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1083
1084         if (wps_parse_msg(msg, &attr) < 0)
1085                 return WPS_FAILURE;
1086
1087         if (!wps_version_supported(attr.version)) {
1088                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1089                            attr.version ? *attr.version : 0);
1090                 return WPS_FAILURE;
1091         }
1092
1093         if (attr.msg_type == NULL) {
1094                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1095                 return WPS_FAILURE;
1096         }
1097
1098         if (*attr.msg_type != WPS_WSC_ACK) {
1099                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1100                            *attr.msg_type);
1101                 return WPS_FAILURE;
1102         }
1103
1104         if (attr.registrar_nonce == NULL ||
1105             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1106         {
1107                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1108                 return WPS_FAILURE;
1109         }
1110
1111         if (attr.enrollee_nonce == NULL ||
1112             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1113                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1114                 return WPS_FAILURE;
1115         }
1116
1117         if (wps->state == RECV_ACK && wps->wps->ap) {
1118                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1119                            "completed successfully");
1120                 wps_success_event(wps->wps);
1121                 wps->state = WPS_FINISHED;
1122                 return WPS_DONE;
1123         }
1124
1125         return WPS_FAILURE;
1126 }
1127
1128
1129 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1130                                                  const struct wpabuf *msg)
1131 {
1132         struct wps_parse_attr attr;
1133
1134         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1135
1136         if (wps_parse_msg(msg, &attr) < 0)
1137                 return WPS_FAILURE;
1138
1139         if (!wps_version_supported(attr.version)) {
1140                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1141                            attr.version ? *attr.version : 0);
1142                 return WPS_FAILURE;
1143         }
1144
1145         if (attr.msg_type == NULL) {
1146                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1147                 return WPS_FAILURE;
1148         }
1149
1150         if (*attr.msg_type != WPS_WSC_NACK) {
1151                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1152                            *attr.msg_type);
1153                 return WPS_FAILURE;
1154         }
1155
1156         if (attr.registrar_nonce == NULL ||
1157             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1158         {
1159                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1160                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1161                             attr.registrar_nonce, WPS_NONCE_LEN);
1162                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1163                             wps->nonce_r, WPS_NONCE_LEN);
1164                 return WPS_FAILURE;
1165         }
1166
1167         if (attr.enrollee_nonce == NULL ||
1168             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1169                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1170                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1171                             attr.enrollee_nonce, WPS_NONCE_LEN);
1172                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1173                             wps->nonce_e, WPS_NONCE_LEN);
1174                 return WPS_FAILURE;
1175         }
1176
1177         if (attr.config_error == NULL) {
1178                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1179                            "in WSC_NACK");
1180                 return WPS_FAILURE;
1181         }
1182
1183         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1184                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1185
1186         switch (wps->state) {
1187         case RECV_M4:
1188                 wps_fail_event(wps->wps, WPS_M3);
1189                 break;
1190         case RECV_M6:
1191                 wps_fail_event(wps->wps, WPS_M5);
1192                 break;
1193         case RECV_M8:
1194                 wps_fail_event(wps->wps, WPS_M7);
1195                 break;
1196         default:
1197                 break;
1198         }
1199
1200         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1201          * Enrollee is Authenticator */
1202         wps->state = SEND_WSC_NACK;
1203
1204         return WPS_FAILURE;
1205 }
1206
1207
1208 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1209                                               enum wsc_op_code op_code,
1210                                               const struct wpabuf *msg)
1211 {
1212
1213         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1214                    "op_code=%d)",
1215                    (unsigned long) wpabuf_len(msg), op_code);
1216
1217         if (op_code == WSC_UPnP) {
1218                 /* Determine the OpCode based on message type attribute */
1219                 struct wps_parse_attr attr;
1220                 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1221                         if (*attr.msg_type == WPS_WSC_ACK)
1222                                 op_code = WSC_ACK;
1223                         else if (*attr.msg_type == WPS_WSC_NACK)
1224                                 op_code = WSC_NACK;
1225                 }
1226         }
1227
1228         switch (op_code) {
1229         case WSC_MSG:
1230         case WSC_UPnP:
1231                 return wps_process_wsc_msg(wps, msg);
1232         case WSC_ACK:
1233                 return wps_process_wsc_ack(wps, msg);
1234         case WSC_NACK:
1235                 return wps_process_wsc_nack(wps, msg);
1236         default:
1237                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1238                 return WPS_FAILURE;
1239         }
1240 }