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             wps_build_version2(msg)) {
 151                 wpabuf_free(msg);
 152                 return NULL;
 153         }
 154
 155         wps->state = RECV_M2;
 156         return msg;
 157 }
 158
 159
 160 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 161 {
 162         struct wpabuf *msg;
 163
 164         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 165
 166         if (wps->dev_password == NULL) {
 167                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 168                 return NULL;
 169         }
 170         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 171
 172         msg = wpabuf_alloc(1000);
 173         if (msg == NULL)
 174                 return NULL;
 175
 176         if (wps_build_version(msg) ||
 177             wps_build_msg_type(msg, WPS_M3) ||
 178             wps_build_registrar_nonce(wps, msg) ||
 179             wps_build_e_hash(wps, msg) ||
 180             wps_build_version2(msg) ||
 181             wps_build_authenticator(wps, msg)) {
 182                 wpabuf_free(msg);
 183                 return NULL;
 184         }
 185
 186         wps->state = RECV_M4;
 187         return msg;
 188 }
 189
 190
 191 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 192 {
 193         struct wpabuf *msg, *plain;
 194
 195         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 196
 197         plain = wpabuf_alloc(200);
 198         if (plain == NULL)
 199                 return NULL;
 200
 201         msg = wpabuf_alloc(1000);
 202         if (msg == NULL) {
 203                 wpabuf_free(plain);
 204                 return NULL;
 205         }
 206
 207         if (wps_build_version(msg) ||
 208             wps_build_msg_type(msg, WPS_M5) ||
 209             wps_build_registrar_nonce(wps, msg) ||
 210             wps_build_e_snonce1(wps, plain) ||
 211             wps_build_key_wrap_auth(wps, plain) ||
 212             wps_build_encr_settings(wps, msg, plain) ||
 213             wps_build_version2(msg) ||
 214             wps_build_authenticator(wps, msg)) {
 215                 wpabuf_free(plain);
 216                 wpabuf_free(msg);
 217                 return NULL;
 218         }
 219         wpabuf_free(plain);
 220
 221         wps->state = RECV_M6;
 222         return msg;
 223 }
 224
 225
 226 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 227 {
 228         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 229         wpabuf_put_be16(msg, ATTR_SSID);
 230         wpabuf_put_be16(msg, wps->wps->ssid_len);
 231         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 232         return 0;
 233 }
 234
 235
 236 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 237 {
 238         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
 239         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 240         wpabuf_put_be16(msg, 2);
 241         wpabuf_put_be16(msg, wps->wps->auth_types);
 242         return 0;
 243 }
 244
 245
 246 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 247 {
 248         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
 249         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 250         wpabuf_put_be16(msg, 2);
 251         wpabuf_put_be16(msg, wps->wps->encr_types);
 252         return 0;
 253 }
 254
 255
 256 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 257 {
 258         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 259         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 260         wpabuf_put_be16(msg, wps->wps->network_key_len);
 261         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 262         return 0;
 263 }
 264
 265
 266 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 267 {
 268         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 269         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 270         wpabuf_put_be16(msg, ETH_ALEN);
 271         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 272         return 0;
 273 }
 274
 275
 276 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
 277 {
 278         if (wps->wps->ap_settings) {
 279                 wpa_printf(MSG_DEBUG, "WPS:  * AP Settings (pre-configured)");
 280                 wpabuf_put_data(plain, wps->wps->ap_settings,
 281                                 wps->wps->ap_settings_len);
 282                 return 0;
 283         }
 284
 285         return wps_build_cred_ssid(wps, plain) ||
 286                 wps_build_cred_mac_addr(wps, plain) ||
 287                 wps_build_cred_auth_type(wps, plain) ||
 288                 wps_build_cred_encr_type(wps, plain) ||
 289                 wps_build_cred_network_key(wps, plain);
 290 }
 291
 292
 293 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 294 {
 295         struct wpabuf *msg, *plain;
 296
 297         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 298
 299         plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
 300         if (plain == NULL)
 301                 return NULL;
 302
 303         msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
 304         if (msg == NULL) {
 305                 wpabuf_free(plain);
 306                 return NULL;
 307         }
 308
 309         if (wps_build_version(msg) ||
 310             wps_build_msg_type(msg, WPS_M7) ||
 311             wps_build_registrar_nonce(wps, msg) ||
 312             wps_build_e_snonce2(wps, plain) ||
 313             (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
 314             wps_build_key_wrap_auth(wps, plain) ||
 315             wps_build_encr_settings(wps, msg, plain) ||
 316             wps_build_version2(msg) ||
 317             wps_build_authenticator(wps, msg)) {
 318                 wpabuf_free(plain);
 319                 wpabuf_free(msg);
 320                 return NULL;
 321         }
 322         wpabuf_free(plain);
 323
 324         if (wps->wps->ap && wps->wps->registrar) {
 325                 /*
 326                  * If the Registrar is only learning our current configuration,
 327                  * it may not continue protocol run to successful completion.
 328                  * Store information here to make sure it remains available.
 329                  */
 330                 wps_device_store(wps->wps->registrar, &wps->peer_dev,
 331                                  wps->uuid_r);
 332         }
 333
 334         wps->state = RECV_M8;
 335         return msg;
 336 }
 337
 338
 339 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 340 {
 341         struct wpabuf *msg;
 342
 343         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 344
 345         msg = wpabuf_alloc(1000);
 346         if (msg == NULL)
 347                 return NULL;
 348
 349         if (wps_build_version(msg) ||
 350             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 351             wps_build_enrollee_nonce(wps, msg) ||
 352             wps_build_registrar_nonce(wps, msg) ||
 353             wps_build_version2(msg)) {
 354                 wpabuf_free(msg);
 355                 return NULL;
 356         }
 357
 358         if (wps->wps->ap)
 359                 wps->state = RECV_ACK;
 360         else {
 361                 wps_success_event(wps->wps);
 362                 wps->state = WPS_FINISHED;
 363         }
 364         return msg;
 365 }
 366
 367
 368 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
 369 {
 370         struct wpabuf *msg;
 371
 372         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
 373
 374         msg = wpabuf_alloc(1000);
 375         if (msg == NULL)
 376                 return NULL;
 377
 378         if (wps_build_version(msg) ||
 379             wps_build_msg_type(msg, WPS_WSC_ACK) ||
 380             wps_build_enrollee_nonce(wps, msg) ||
 381             wps_build_registrar_nonce(wps, msg) ||
 382             wps_build_version2(msg)) {
 383                 wpabuf_free(msg);
 384                 return NULL;
 385         }
 386
 387         return msg;
 388 }
 389
 390
 391 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
 392 {
 393         struct wpabuf *msg;
 394
 395         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
 396
 397         msg = wpabuf_alloc(1000);
 398         if (msg == NULL)
 399                 return NULL;
 400
 401         if (wps_build_version(msg) ||
 402             wps_build_msg_type(msg, WPS_WSC_NACK) ||
 403             wps_build_enrollee_nonce(wps, msg) ||
 404             wps_build_registrar_nonce(wps, msg) ||
 405             wps_build_config_error(msg, wps->config_error) ||
 406             wps_build_version2(msg)) {
 407                 wpabuf_free(msg);
 408                 return NULL;
 409         }
 410
 411         return msg;
 412 }
 413
 414
 415 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
 416                                      enum wsc_op_code *op_code)
 417 {
 418         struct wpabuf *msg;
 419
 420         switch (wps->state) {
 421         case SEND_M1:
 422                 msg = wps_build_m1(wps);
 423                 *op_code = WSC_MSG;
 424                 break;
 425         case SEND_M3:
 426                 msg = wps_build_m3(wps);
 427                 *op_code = WSC_MSG;
 428                 break;
 429         case SEND_M5:
 430                 msg = wps_build_m5(wps);
 431                 *op_code = WSC_MSG;
 432                 break;
 433         case SEND_M7:
 434                 msg = wps_build_m7(wps);
 435                 *op_code = WSC_MSG;
 436                 break;
 437         case RECEIVED_M2D:
 438                 if (wps->wps->ap) {
 439                         msg = wps_build_wsc_nack(wps);
 440                         *op_code = WSC_NACK;
 441                         break;
 442                 }
 443                 msg = wps_build_wsc_ack(wps);
 444                 *op_code = WSC_ACK;
 445                 if (msg) {
 446                         /* Another M2/M2D may be received */
 447                         wps->state = RECV_M2;
 448                 }
 449                 break;
 450         case SEND_WSC_NACK:
 451                 msg = wps_build_wsc_nack(wps);
 452                 *op_code = WSC_NACK;
 453                 break;
 454         case WPS_MSG_DONE:
 455                 msg = wps_build_wsc_done(wps);
 456                 *op_code = WSC_Done;
 457                 break;
 458         default:
 459                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 460                            "a message", wps->state);
 461                 msg = NULL;
 462                 break;
 463         }
 464
 465         if (*op_code == WSC_MSG && msg) {
 466                 /* Save a copy of the last message for Authenticator derivation
 467                  */
 468                 wpabuf_free(wps->last_msg);
 469                 wps->last_msg = wpabuf_dup(msg);
 470         }
 471
 472         return msg;
 473 }
 474
 475
 476 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 477 {
 478         if (r_nonce == NULL) {
 479                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 480                 return -1;
 481         }
 482
 483         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 484         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 485                     wps->nonce_r, WPS_NONCE_LEN);
 486
 487         return 0;
 488 }
 489
 490
 491 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 492 {
 493         if (e_nonce == NULL) {
 494                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 495                 return -1;
 496         }
 497
 498         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 499                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 500                 return -1;
 501         }
 502
 503         return 0;
 504 }
 505
 506
 507 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 508 {
 509         if (uuid_r == NULL) {
 510                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 511                 return -1;
 512         }
 513
 514         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 515         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 516
 517         return 0;
 518 }
 519
 520
 521 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 522                               size_t pk_len)
 523 {
 524         if (pk == NULL || pk_len == 0) {
 525                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 526                 return -1;
 527         }
 528
 529 #ifdef CONFIG_WPS_OOB
 530         if (wps->dev_pw_id != DEV_PW_DEFAULT &&
 531             wps->wps->oob_conf.pubkey_hash) {
 532                 const u8 *addr[1];
 533                 u8 hash[WPS_HASH_LEN];
 534
 535                 addr[0] = pk;
 536                 sha256_vector(1, addr, &pk_len, hash);
 537                 if (os_memcmp(hash,
 538                               wpabuf_head(wps->wps->oob_conf.pubkey_hash),
 539                               WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 540                         wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
 541                         return -1;
 542                 }
 543         }
 544 #endif /* CONFIG_WPS_OOB */
 545
 546         wpabuf_free(wps->dh_pubkey_r);
 547         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 548         if (wps->dh_pubkey_r == NULL)
 549                 return -1;
 550
 551         if (wps_derive_keys(wps) < 0)
 552                 return -1;
 553
 554         return 0;
 555 }
 556
 557
 558 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 559 {
 560         if (r_hash1 == NULL) {
 561                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 562                 return -1;
 563         }
 564
 565         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 566         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 567
 568         return 0;
 569 }
 570
 571
 572 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 573 {
 574         if (r_hash2 == NULL) {
 575                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 576                 return -1;
 577         }
 578
 579         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 580         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 581
 582         return 0;
 583 }
 584
 585
 586 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 587 {
 588         u8 hash[SHA256_MAC_LEN];
 589         const u8 *addr[4];
 590         size_t len[4];
 591
 592         if (r_snonce1 == NULL) {
 593                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 594                 return -1;
 595         }
 596
 597         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 598                         WPS_SECRET_NONCE_LEN);
 599
 600         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 601         addr[0] = r_snonce1;
 602         len[0] = WPS_SECRET_NONCE_LEN;
 603         addr[1] = wps->psk1;
 604         len[1] = WPS_PSK_LEN;
 605         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 606         len[2] = wpabuf_len(wps->dh_pubkey_e);
 607         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 608         len[3] = wpabuf_len(wps->dh_pubkey_r);
 609         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 610
 611         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 612                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 613                            "not match with the pre-committed value");
 614                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 615                 wps_pwd_auth_fail_event(wps->wps, 1, 1);
 616                 return -1;
 617         }
 618
 619         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 620                    "half of the device password");
 621
 622         return 0;
 623 }
 624
 625
 626 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 627 {
 628         u8 hash[SHA256_MAC_LEN];
 629         const u8 *addr[4];
 630         size_t len[4];
 631
 632         if (r_snonce2 == NULL) {
 633                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 634                 return -1;
 635         }
 636
 637         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 638                         WPS_SECRET_NONCE_LEN);
 639
 640         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 641         addr[0] = r_snonce2;
 642         len[0] = WPS_SECRET_NONCE_LEN;
 643         addr[1] = wps->psk2;
 644         len[1] = WPS_PSK_LEN;
 645         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 646         len[2] = wpabuf_len(wps->dh_pubkey_e);
 647         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 648         len[3] = wpabuf_len(wps->dh_pubkey_r);
 649         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 650
 651         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 652                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 653                            "not match with the pre-committed value");
 654                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 655                 wps_pwd_auth_fail_event(wps->wps, 1, 2);
 656                 return -1;
 657         }
 658
 659         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 660                    "half of the device password");
 661
 662         return 0;
 663 }
 664
 665
 666 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 667                               size_t cred_len, int wps2)
 668 {
 669         struct wps_parse_attr attr;
 670         struct wpabuf msg;
 671
 672         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 673         os_memset(&wps->cred, 0, sizeof(wps->cred));
 674         wpabuf_set(&msg, cred, cred_len);
 675         if (wps_parse_msg(&msg, &attr) < 0 ||
 676             wps_process_cred(&attr, &wps->cred))
 677                 return -1;
 678
 679         if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 680             0) {
 681                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
 682                            MACSTR ") does not match with own address (" MACSTR
 683                            ")", MAC2STR(wps->cred.mac_addr),
 684                            MAC2STR(wps->wps->dev.mac_addr));
 685                 /*
 686                  * In theory, this could be consider fatal error, but there are
 687                  * number of deployed implementations using other address here
 688                  * due to unclarity in the specification. For interoperability
 689                  * reasons, allow this to be processed since we do not really
 690                  * use the MAC Address information for anything.
 691                  */
 692 #ifdef CONFIG_WPS_STRICT
 693                 if (wps2) {
 694                         wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
 695                                    "MAC Address in AP Settings");
 696                         return -1;
 697                 }
 698 #endif /* CONFIG_WPS_STRICT */
 699         }
 700
 701         if (wps->wps->cred_cb) {
 702                 wps->cred.cred_attr = cred - 4;
 703                 wps->cred.cred_attr_len = cred_len + 4;
 704                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 705                 wps->cred.cred_attr = NULL;
 706                 wps->cred.cred_attr_len = 0;
 707         }
 708
 709         return 0;
 710 }
 711
 712
 713 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 714                              size_t cred_len[], size_t num_cred, int wps2)
 715 {
 716         size_t i;
 717
 718         if (wps->wps->ap)
 719                 return 0;
 720
 721         if (num_cred == 0) {
 722                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 723                            "received");
 724                 return -1;
 725         }
 726
 727         for (i = 0; i < num_cred; i++) {
 728                 if (wps_process_cred_e(wps, cred[i], cred_len[i], wps2))
 729                         return -1;
 730         }
 731
 732         return 0;
 733 }
 734
 735
 736 static int wps_process_ap_settings_e(struct wps_data *wps,
 737                                      struct wps_parse_attr *attr,
 738                                      struct wpabuf *attrs, int wps2)
 739 {
 740         struct wps_credential cred;
 741
 742         if (!wps->wps->ap)
 743                 return 0;
 744
 745         if (wps_process_ap_settings(attr, &cred) < 0)
 746                 return -1;
 747
 748         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 749                    "Registrar");
 750
 751         if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 752             0) {
 753                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
 754                            MACSTR ") does not match with own address (" MACSTR
 755                            ")", MAC2STR(cred.mac_addr),
 756                            MAC2STR(wps->wps->dev.mac_addr));
 757                 /*
 758                  * In theory, this could be consider fatal error, but there are
 759                  * number of deployed implementations using other address here
 760                  * due to unclarity in the specification. For interoperability
 761                  * reasons, allow this to be processed since we do not really
 762                  * use the MAC Address information for anything.
 763                  */
 764 #ifdef CONFIG_WPS_STRICT
 765                 if (wps2) {
 766                         wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
 767                                    "MAC Address in AP Settings");
 768                         return -1;
 769                 }
 770 #endif /* CONFIG_WPS_STRICT */
 771         }
 772
 773         if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
 774         {
 775                 if (cred.encr_type & WPS_ENCR_WEP) {
 776                         wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
 777                                    "due to WEP configuration");
 778                         return -1;
 779                 }
 780
 781                 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
 782                            "invalid encr_type 0x%x", cred.encr_type);
 783                 return -1;
 784         }
 785
 786 #ifdef CONFIG_WPS_STRICT
 787         if (wps2) {
 788                 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
 789                     WPS_ENCR_TKIP ||
 790                     (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 791                     WPS_AUTH_WPAPSK) {
 792                         wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
 793                                    "AP Settings: WPA-Personal/TKIP only");
 794                         return -1;
 795                 }
 796         }
 797 #endif /* CONFIG_WPS_STRICT */
 798
 799         if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
 800         {
 801                 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
 802                            "TKIP+AES");
 803                 cred.encr_type |= WPS_ENCR_AES;
 804         }
 805
 806         if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 807             WPS_AUTH_WPAPSK) {
 808                 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
 809                            "WPAPSK+WPA2PSK");
 810                 cred.auth_type |= WPS_AUTH_WPA2PSK;
 811         }
 812
 813         if (wps->wps->cred_cb) {
 814                 cred.cred_attr = wpabuf_head(attrs);
 815                 cred.cred_attr_len = wpabuf_len(attrs);
 816                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 817         }
 818
 819         return 0;
 820 }
 821
 822
 823 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 824                                            const struct wpabuf *msg,
 825                                            struct wps_parse_attr *attr)
 826 {
 827         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 828
 829         if (wps->state != RECV_M2) {
 830                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 831                            "receiving M2", wps->state);
 832                 wps->state = SEND_WSC_NACK;
 833                 return WPS_CONTINUE;
 834         }
 835
 836         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 837             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 838             wps_process_uuid_r(wps, attr->uuid_r)) {
 839                 wps->state = SEND_WSC_NACK;
 840                 return WPS_CONTINUE;
 841         }
 842
 843         if (wps->wps->ap &&
 844             (wps->wps->ap_setup_locked || wps->dev_password == NULL)) {
 845                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 846                            "registration of a new Registrar");
 847                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 848                 wps->state = SEND_WSC_NACK;
 849                 return WPS_CONTINUE;
 850         }
 851
 852         if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 853             wps_process_authenticator(wps, attr->authenticator, msg) ||
 854             wps_process_device_attrs(&wps->peer_dev, attr)) {
 855                 wps->state = SEND_WSC_NACK;
 856                 return WPS_CONTINUE;
 857         }
 858
 859         wps->state = SEND_M3;
 860         return WPS_CONTINUE;
 861 }
 862
 863
 864 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 865                                             struct wps_parse_attr *attr)
 866 {
 867         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 868
 869         if (wps->state != RECV_M2) {
 870                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 871                            "receiving M2D", wps->state);
 872                 wps->state = SEND_WSC_NACK;
 873                 return WPS_CONTINUE;
 874         }
 875
 876         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 877                           attr->manufacturer, attr->manufacturer_len);
 878         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 879                           attr->model_name, attr->model_name_len);
 880         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 881                           attr->model_number, attr->model_number_len);
 882         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 883                           attr->serial_number, attr->serial_number_len);
 884         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 885                           attr->dev_name, attr->dev_name_len);
 886
 887         if (wps->wps->event_cb) {
 888                 union wps_event_data data;
 889                 struct wps_event_m2d *m2d = &data.m2d;
 890                 os_memset(&data, 0, sizeof(data));
 891                 if (attr->config_methods)
 892                         m2d->config_methods =
 893                                 WPA_GET_BE16(attr->config_methods);
 894                 m2d->manufacturer = attr->manufacturer;
 895                 m2d->manufacturer_len = attr->manufacturer_len;
 896                 m2d->model_name = attr->model_name;
 897                 m2d->model_name_len = attr->model_name_len;
 898                 m2d->model_number = attr->model_number;
 899                 m2d->model_number_len = attr->model_number_len;
 900                 m2d->serial_number = attr->serial_number;
 901                 m2d->serial_number_len = attr->serial_number_len;
 902                 m2d->dev_name = attr->dev_name;
 903                 m2d->dev_name_len = attr->dev_name_len;
 904                 m2d->primary_dev_type = attr->primary_dev_type;
 905                 if (attr->config_error)
 906                         m2d->config_error =
 907                                 WPA_GET_BE16(attr->config_error);
 908                 if (attr->dev_password_id)
 909                         m2d->dev_password_id =
 910                                 WPA_GET_BE16(attr->dev_password_id);
 911                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 912         }
 913
 914         wps->state = RECEIVED_M2D;
 915         return WPS_CONTINUE;
 916 }
 917
 918
 919 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 920                                            const struct wpabuf *msg,
 921                                            struct wps_parse_attr *attr)
 922 {
 923         struct wpabuf *decrypted;
 924         struct wps_parse_attr eattr;
 925
 926         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 927
 928         if (wps->state != RECV_M4) {
 929                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 930                            "receiving M4", wps->state);
 931                 wps->state = SEND_WSC_NACK;
 932                 return WPS_CONTINUE;
 933         }
 934
 935         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 936             wps_process_authenticator(wps, attr->authenticator, msg) ||
 937             wps_process_r_hash1(wps, attr->r_hash1) ||
 938             wps_process_r_hash2(wps, attr->r_hash2)) {
 939                 wps->state = SEND_WSC_NACK;
 940                 return WPS_CONTINUE;
 941         }
 942
 943         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 944                                               attr->encr_settings_len);
 945         if (decrypted == NULL) {
 946                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 947                            "Settings attribute");
 948                 wps->state = SEND_WSC_NACK;
 949                 return WPS_CONTINUE;
 950         }
 951
 952         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 953                    "attribute");
 954         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 955             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 956             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 957                 wpabuf_free(decrypted);
 958                 wps->state = SEND_WSC_NACK;
 959                 return WPS_CONTINUE;
 960         }
 961         wpabuf_free(decrypted);
 962
 963         wps->state = SEND_M5;
 964         return WPS_CONTINUE;
 965 }
 966
 967
 968 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 969                                            const struct wpabuf *msg,
 970                                            struct wps_parse_attr *attr)
 971 {
 972         struct wpabuf *decrypted;
 973         struct wps_parse_attr eattr;
 974
 975         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 976
 977         if (wps->state != RECV_M6) {
 978                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 979                            "receiving M6", wps->state);
 980                 wps->state = SEND_WSC_NACK;
 981                 return WPS_CONTINUE;
 982         }
 983
 984         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 985             wps_process_authenticator(wps, attr->authenticator, msg)) {
 986                 wps->state = SEND_WSC_NACK;
 987                 return WPS_CONTINUE;
 988         }
 989
 990         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 991                                               attr->encr_settings_len);
 992         if (decrypted == NULL) {
 993                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 994                            "Settings attribute");
 995                 wps->state = SEND_WSC_NACK;
 996                 return WPS_CONTINUE;
 997         }
 998
 999         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1000                    "attribute");
1001         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1002             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1003             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1004                 wpabuf_free(decrypted);
1005                 wps->state = SEND_WSC_NACK;
1006                 return WPS_CONTINUE;
1007         }
1008         wpabuf_free(decrypted);
1009
1010         wps->state = SEND_M7;
1011         return WPS_CONTINUE;
1012 }
1013
1014
1015 static enum wps_process_res wps_process_m8(struct wps_data *wps,
1016                                            const struct wpabuf *msg,
1017                                            struct wps_parse_attr *attr)
1018 {
1019         struct wpabuf *decrypted;
1020         struct wps_parse_attr eattr;
1021
1022         wpa_printf(MSG_DEBUG, "WPS: Received M8");
1023
1024         if (wps->state != RECV_M8) {
1025                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1026                            "receiving M8", wps->state);
1027                 wps->state = SEND_WSC_NACK;
1028                 return WPS_CONTINUE;
1029         }
1030
1031         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1032             wps_process_authenticator(wps, attr->authenticator, msg)) {
1033                 wps->state = SEND_WSC_NACK;
1034                 return WPS_CONTINUE;
1035         }
1036
1037         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1038                                               attr->encr_settings_len);
1039         if (decrypted == NULL) {
1040                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1041                            "Settings attribute");
1042                 wps->state = SEND_WSC_NACK;
1043                 return WPS_CONTINUE;
1044         }
1045
1046         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1047                    "attribute");
1048         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1049             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1050             wps_process_creds(wps, eattr.cred, eattr.cred_len,
1051                               eattr.num_cred, attr->version2 != NULL) ||
1052             wps_process_ap_settings_e(wps, &eattr, decrypted,
1053                                       attr->version2 != NULL)) {
1054                 wpabuf_free(decrypted);
1055                 wps->state = SEND_WSC_NACK;
1056                 return WPS_CONTINUE;
1057         }
1058         wpabuf_free(decrypted);
1059
1060         wps->state = WPS_MSG_DONE;
1061         return WPS_CONTINUE;
1062 }
1063
1064
1065 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1066                                                 const struct wpabuf *msg)
1067 {
1068         struct wps_parse_attr attr;
1069         enum wps_process_res ret = WPS_CONTINUE;
1070
1071         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1072
1073         if (wps_parse_msg(msg, &attr) < 0)
1074                 return WPS_FAILURE;
1075
1076         if (attr.enrollee_nonce == NULL ||
1077             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1078                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1079                 return WPS_FAILURE;
1080         }
1081
1082         if (attr.msg_type == NULL) {
1083                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1084                 return WPS_FAILURE;
1085         }
1086
1087         switch (*attr.msg_type) {
1088         case WPS_M2:
1089                 ret = wps_process_m2(wps, msg, &attr);
1090                 break;
1091         case WPS_M2D:
1092                 ret = wps_process_m2d(wps, &attr);
1093                 break;
1094         case WPS_M4:
1095                 ret = wps_process_m4(wps, msg, &attr);
1096                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1097                         wps_fail_event(wps->wps, WPS_M4);
1098                 break;
1099         case WPS_M6:
1100                 ret = wps_process_m6(wps, msg, &attr);
1101                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1102                         wps_fail_event(wps->wps, WPS_M6);
1103                 break;
1104         case WPS_M8:
1105                 ret = wps_process_m8(wps, msg, &attr);
1106                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1107                         wps_fail_event(wps->wps, WPS_M8);
1108                 break;
1109         default:
1110                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1111                            *attr.msg_type);
1112                 return WPS_FAILURE;
1113         }
1114
1115         /*
1116          * Save a copy of the last message for Authenticator derivation if we
1117          * are continuing. However, skip M2D since it is not authenticated and
1118          * neither is the ACK/NACK response frame. This allows the possibly
1119          * following M2 to be processed correctly by using the previously sent
1120          * M1 in Authenticator derivation.
1121          */
1122         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1123                 /* Save a copy of the last message for Authenticator derivation
1124                  */
1125                 wpabuf_free(wps->last_msg);
1126                 wps->last_msg = wpabuf_dup(msg);
1127         }
1128
1129         return ret;
1130 }
1131
1132
1133 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1134                                                 const struct wpabuf *msg)
1135 {
1136         struct wps_parse_attr attr;
1137
1138         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1139
1140         if (wps_parse_msg(msg, &attr) < 0)
1141                 return WPS_FAILURE;
1142
1143         if (attr.msg_type == NULL) {
1144                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1145                 return WPS_FAILURE;
1146         }
1147
1148         if (*attr.msg_type != WPS_WSC_ACK) {
1149                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1150                            *attr.msg_type);
1151                 return WPS_FAILURE;
1152         }
1153
1154         if (attr.registrar_nonce == NULL ||
1155             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1156         {
1157                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1158                 return WPS_FAILURE;
1159         }
1160
1161         if (attr.enrollee_nonce == NULL ||
1162             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1163                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1164                 return WPS_FAILURE;
1165         }
1166
1167         if (wps->state == RECV_ACK && wps->wps->ap) {
1168                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1169                            "completed successfully");
1170                 wps_success_event(wps->wps);
1171                 wps->state = WPS_FINISHED;
1172                 return WPS_DONE;
1173         }
1174
1175         return WPS_FAILURE;
1176 }
1177
1178
1179 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1180                                                  const struct wpabuf *msg)
1181 {
1182         struct wps_parse_attr attr;
1183
1184         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1185
1186         if (wps_parse_msg(msg, &attr) < 0)
1187                 return WPS_FAILURE;
1188
1189         if (attr.msg_type == NULL) {
1190                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1191                 return WPS_FAILURE;
1192         }
1193
1194         if (*attr.msg_type != WPS_WSC_NACK) {
1195                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1196                            *attr.msg_type);
1197                 return WPS_FAILURE;
1198         }
1199
1200         if (attr.registrar_nonce == NULL ||
1201             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1202         {
1203                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1204                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1205                             attr.registrar_nonce, WPS_NONCE_LEN);
1206                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1207                             wps->nonce_r, WPS_NONCE_LEN);
1208                 return WPS_FAILURE;
1209         }
1210
1211         if (attr.enrollee_nonce == NULL ||
1212             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1213                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1214                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1215                             attr.enrollee_nonce, WPS_NONCE_LEN);
1216                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1217                             wps->nonce_e, WPS_NONCE_LEN);
1218                 return WPS_FAILURE;
1219         }
1220
1221         if (attr.config_error == NULL) {
1222                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1223                            "in WSC_NACK");
1224                 return WPS_FAILURE;
1225         }
1226
1227         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1228                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1229
1230         switch (wps->state) {
1231         case RECV_M4:
1232                 wps_fail_event(wps->wps, WPS_M3);
1233                 break;
1234         case RECV_M6:
1235                 wps_fail_event(wps->wps, WPS_M5);
1236                 break;
1237         case RECV_M8:
1238                 wps_fail_event(wps->wps, WPS_M7);
1239                 break;
1240         default:
1241                 break;
1242         }
1243
1244         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1245          * Enrollee is Authenticator */
1246         wps->state = SEND_WSC_NACK;
1247
1248         return WPS_FAILURE;
1249 }
1250
1251
1252 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1253                                               enum wsc_op_code op_code,
1254                                               const struct wpabuf *msg)
1255 {
1256
1257         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1258                    "op_code=%d)",
1259                    (unsigned long) wpabuf_len(msg), op_code);
1260
1261         if (op_code == WSC_UPnP) {
1262                 /* Determine the OpCode based on message type attribute */
1263                 struct wps_parse_attr attr;
1264                 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1265                         if (*attr.msg_type == WPS_WSC_ACK)
1266                                 op_code = WSC_ACK;
1267                         else if (*attr.msg_type == WPS_WSC_NACK)
1268                                 op_code = WSC_NACK;
1269                 }
1270         }
1271
1272         switch (op_code) {
1273         case WSC_MSG:
1274         case WSC_UPnP:
1275                 return wps_process_wsc_msg(wps, msg);
1276         case WSC_ACK:
1277                 return wps_process_wsc_ack(wps, msg);
1278         case WSC_NACK:
1279                 return wps_process_wsc_nack(wps, msg);
1280         default:
1281                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1282                 return WPS_FAILURE;
1283         }
1284 }