www.project-moonshot.org Git - mech_eap.orig/blob - 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_wfa_ext(msg, 0, NULL, 0)) {
 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_wfa_ext(msg, 0, NULL, 0) ||
 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_wfa_ext(msg, 0, NULL, 0) ||
 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_wfa_ext(msg, 0, NULL, 0) ||
 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_wfa_ext(msg, 0, NULL, 0)) {
 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_wfa_ext(msg, 0, NULL, 0)) {
 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_wfa_ext(msg, 0, NULL, 0)) {
 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 #ifdef CONFIG_WPS2
 702         if (!(wps->cred.encr_type &
 703               (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
 704                 if (wps->cred.encr_type & WPS_ENCR_WEP) {
 705                         wpa_printf(MSG_INFO, "WPS: Reject Credential "
 706                                    "due to WEP configuration");
 707                         return -2;
 708                 }
 709
 710                 wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
 711                            "invalid encr_type 0x%x", wps->cred.encr_type);
 712                 return -1;
 713         }
 714 #endif /* CONFIG_WPS2 */
 715
 716         if (wps->wps->cred_cb) {
 717                 wps->cred.cred_attr = cred - 4;
 718                 wps->cred.cred_attr_len = cred_len + 4;
 719                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 720                 wps->cred.cred_attr = NULL;
 721                 wps->cred.cred_attr_len = 0;
 722         }
 723
 724         return 0;
 725 }
 726
 727
 728 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 729                              size_t cred_len[], size_t num_cred, int wps2)
 730 {
 731         size_t i;
 732         int ok = 0;
 733
 734         if (wps->wps->ap)
 735                 return 0;
 736
 737         if (num_cred == 0) {
 738                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 739                            "received");
 740                 return -1;
 741         }
 742
 743         for (i = 0; i < num_cred; i++) {
 744                 int res;
 745                 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
 746                 if (res == 0)
 747                         ok++;
 748                 else if (res == -2)
 749                         wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
 750                 else
 751                         return -1;
 752         }
 753
 754         if (ok == 0) {
 755                 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
 756                            "received");
 757                 return -1;
 758         }
 759
 760         return 0;
 761 }
 762
 763
 764 static int wps_process_ap_settings_e(struct wps_data *wps,
 765                                      struct wps_parse_attr *attr,
 766                                      struct wpabuf *attrs, int wps2)
 767 {
 768         struct wps_credential cred;
 769
 770         if (!wps->wps->ap)
 771                 return 0;
 772
 773         if (wps_process_ap_settings(attr, &cred) < 0)
 774                 return -1;
 775
 776         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 777                    "Registrar");
 778
 779         if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 780             0) {
 781                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
 782                            MACSTR ") does not match with own address (" MACSTR
 783                            ")", MAC2STR(cred.mac_addr),
 784                            MAC2STR(wps->wps->dev.mac_addr));
 785                 /*
 786                  * In theory, this could be consider fatal error, but there are
 787                  * number of deployed implementations using other address here
 788                  * due to unclarity in the specification. For interoperability
 789                  * reasons, allow this to be processed since we do not really
 790                  * use the MAC Address information for anything.
 791                  */
 792 #ifdef CONFIG_WPS_STRICT
 793                 if (wps2) {
 794                         wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
 795                                    "MAC Address in AP Settings");
 796                         return -1;
 797                 }
 798 #endif /* CONFIG_WPS_STRICT */
 799         }
 800
 801 #ifdef CONFIG_WPS2
 802         if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
 803         {
 804                 if (cred.encr_type & WPS_ENCR_WEP) {
 805                         wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
 806                                    "due to WEP configuration");
 807                         return -1;
 808                 }
 809
 810                 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
 811                            "invalid encr_type 0x%x", cred.encr_type);
 812                 return -1;
 813         }
 814 #endif /* CONFIG_WPS2 */
 815
 816 #ifdef CONFIG_WPS_STRICT
 817         if (wps2) {
 818                 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
 819                     WPS_ENCR_TKIP ||
 820                     (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 821                     WPS_AUTH_WPAPSK) {
 822                         wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
 823                                    "AP Settings: WPA-Personal/TKIP only");
 824                         return -1;
 825                 }
 826         }
 827 #endif /* CONFIG_WPS_STRICT */
 828
 829 #ifdef CONFIG_WPS2
 830         if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
 831         {
 832                 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
 833                            "TKIP+AES");
 834                 cred.encr_type |= WPS_ENCR_AES;
 835         }
 836
 837         if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 838             WPS_AUTH_WPAPSK) {
 839                 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
 840                            "WPAPSK+WPA2PSK");
 841                 cred.auth_type |= WPS_AUTH_WPA2PSK;
 842         }
 843 #endif /* CONFIG_WPS2 */
 844
 845         if (wps->wps->cred_cb) {
 846                 cred.cred_attr = wpabuf_head(attrs);
 847                 cred.cred_attr_len = wpabuf_len(attrs);
 848                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 849         }
 850
 851         return 0;
 852 }
 853
 854
 855 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 856                                            const struct wpabuf *msg,
 857                                            struct wps_parse_attr *attr)
 858 {
 859         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 860
 861         if (wps->state != RECV_M2) {
 862                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 863                            "receiving M2", wps->state);
 864                 wps->state = SEND_WSC_NACK;
 865                 return WPS_CONTINUE;
 866         }
 867
 868         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 869             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 870             wps_process_uuid_r(wps, attr->uuid_r)) {
 871                 wps->state = SEND_WSC_NACK;
 872                 return WPS_CONTINUE;
 873         }
 874
 875         if (wps->wps->ap &&
 876             (wps->wps->ap_setup_locked || wps->dev_password == NULL)) {
 877                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 878                            "registration of a new Registrar");
 879                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 880                 wps->state = SEND_WSC_NACK;
 881                 return WPS_CONTINUE;
 882         }
 883
 884         if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 885             wps_process_authenticator(wps, attr->authenticator, msg) ||
 886             wps_process_device_attrs(&wps->peer_dev, attr)) {
 887                 wps->state = SEND_WSC_NACK;
 888                 return WPS_CONTINUE;
 889         }
 890
 891         wps->state = SEND_M3;
 892         return WPS_CONTINUE;
 893 }
 894
 895
 896 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 897                                             struct wps_parse_attr *attr)
 898 {
 899         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 900
 901         if (wps->state != RECV_M2) {
 902                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 903                            "receiving M2D", wps->state);
 904                 wps->state = SEND_WSC_NACK;
 905                 return WPS_CONTINUE;
 906         }
 907
 908         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 909                           attr->manufacturer, attr->manufacturer_len);
 910         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 911                           attr->model_name, attr->model_name_len);
 912         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 913                           attr->model_number, attr->model_number_len);
 914         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 915                           attr->serial_number, attr->serial_number_len);
 916         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 917                           attr->dev_name, attr->dev_name_len);
 918
 919         if (wps->wps->event_cb) {
 920                 union wps_event_data data;
 921                 struct wps_event_m2d *m2d = &data.m2d;
 922                 os_memset(&data, 0, sizeof(data));
 923                 if (attr->config_methods)
 924                         m2d->config_methods =
 925                                 WPA_GET_BE16(attr->config_methods);
 926                 m2d->manufacturer = attr->manufacturer;
 927                 m2d->manufacturer_len = attr->manufacturer_len;
 928                 m2d->model_name = attr->model_name;
 929                 m2d->model_name_len = attr->model_name_len;
 930                 m2d->model_number = attr->model_number;
 931                 m2d->model_number_len = attr->model_number_len;
 932                 m2d->serial_number = attr->serial_number;
 933                 m2d->serial_number_len = attr->serial_number_len;
 934                 m2d->dev_name = attr->dev_name;
 935                 m2d->dev_name_len = attr->dev_name_len;
 936                 m2d->primary_dev_type = attr->primary_dev_type;
 937                 if (attr->config_error)
 938                         m2d->config_error =
 939                                 WPA_GET_BE16(attr->config_error);
 940                 if (attr->dev_password_id)
 941                         m2d->dev_password_id =
 942                                 WPA_GET_BE16(attr->dev_password_id);
 943                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 944         }
 945
 946         wps->state = RECEIVED_M2D;
 947         return WPS_CONTINUE;
 948 }
 949
 950
 951 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 952                                            const struct wpabuf *msg,
 953                                            struct wps_parse_attr *attr)
 954 {
 955         struct wpabuf *decrypted;
 956         struct wps_parse_attr eattr;
 957
 958         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 959
 960         if (wps->state != RECV_M4) {
 961                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 962                            "receiving M4", wps->state);
 963                 wps->state = SEND_WSC_NACK;
 964                 return WPS_CONTINUE;
 965         }
 966
 967         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 968             wps_process_authenticator(wps, attr->authenticator, msg) ||
 969             wps_process_r_hash1(wps, attr->r_hash1) ||
 970             wps_process_r_hash2(wps, attr->r_hash2)) {
 971                 wps->state = SEND_WSC_NACK;
 972                 return WPS_CONTINUE;
 973         }
 974
 975         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 976                                               attr->encr_settings_len);
 977         if (decrypted == NULL) {
 978                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 979                            "Settings attribute");
 980                 wps->state = SEND_WSC_NACK;
 981                 return WPS_CONTINUE;
 982         }
 983
 984         if (wps_validate_m4_encr(decrypted, attr->version2 != 0) < 0) {
 985                 wpabuf_free(decrypted);
 986                 wps->state = SEND_WSC_NACK;
 987                 return WPS_CONTINUE;
 988         }
 989
 990         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 991                    "attribute");
 992         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 993             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 994             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 995                 wpabuf_free(decrypted);
 996                 wps->state = SEND_WSC_NACK;
 997                 return WPS_CONTINUE;
 998         }
 999         wpabuf_free(decrypted);
1000
1001         wps->state = SEND_M5;
1002         return WPS_CONTINUE;
1003 }
1004
1005
1006 static enum wps_process_res wps_process_m6(struct wps_data *wps,
1007                                            const struct wpabuf *msg,
1008                                            struct wps_parse_attr *attr)
1009 {
1010         struct wpabuf *decrypted;
1011         struct wps_parse_attr eattr;
1012
1013         wpa_printf(MSG_DEBUG, "WPS: Received M6");
1014
1015         if (wps->state != RECV_M6) {
1016                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1017                            "receiving M6", wps->state);
1018                 wps->state = SEND_WSC_NACK;
1019                 return WPS_CONTINUE;
1020         }
1021
1022         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1023             wps_process_authenticator(wps, attr->authenticator, msg)) {
1024                 wps->state = SEND_WSC_NACK;
1025                 return WPS_CONTINUE;
1026         }
1027
1028         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1029                                               attr->encr_settings_len);
1030         if (decrypted == NULL) {
1031                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1032                            "Settings attribute");
1033                 wps->state = SEND_WSC_NACK;
1034                 return WPS_CONTINUE;
1035         }
1036
1037         if (wps_validate_m6_encr(decrypted, attr->version2 != 0) < 0) {
1038                 wpabuf_free(decrypted);
1039                 wps->state = SEND_WSC_NACK;
1040                 return WPS_CONTINUE;
1041         }
1042
1043         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1044                    "attribute");
1045         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1046             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1047             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1048                 wpabuf_free(decrypted);
1049                 wps->state = SEND_WSC_NACK;
1050                 return WPS_CONTINUE;
1051         }
1052         wpabuf_free(decrypted);
1053
1054         wps->state = SEND_M7;
1055         return WPS_CONTINUE;
1056 }
1057
1058
1059 static enum wps_process_res wps_process_m8(struct wps_data *wps,
1060                                            const struct wpabuf *msg,
1061                                            struct wps_parse_attr *attr)
1062 {
1063         struct wpabuf *decrypted;
1064         struct wps_parse_attr eattr;
1065
1066         wpa_printf(MSG_DEBUG, "WPS: Received M8");
1067
1068         if (wps->state != RECV_M8) {
1069                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1070                            "receiving M8", wps->state);
1071                 wps->state = SEND_WSC_NACK;
1072                 return WPS_CONTINUE;
1073         }
1074
1075         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1076             wps_process_authenticator(wps, attr->authenticator, msg)) {
1077                 wps->state = SEND_WSC_NACK;
1078                 return WPS_CONTINUE;
1079         }
1080
1081         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1082                                               attr->encr_settings_len);
1083         if (decrypted == NULL) {
1084                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1085                            "Settings attribute");
1086                 wps->state = SEND_WSC_NACK;
1087                 return WPS_CONTINUE;
1088         }
1089
1090         if (wps_validate_m8_encr(decrypted, wps->wps->ap, attr->version2 != 0)
1091             < 0) {
1092                 wpabuf_free(decrypted);
1093                 wps->state = SEND_WSC_NACK;
1094                 return WPS_CONTINUE;
1095         }
1096
1097         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1098                    "attribute");
1099         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1100             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1101             wps_process_creds(wps, eattr.cred, eattr.cred_len,
1102                               eattr.num_cred, attr->version2 != NULL) ||
1103             wps_process_ap_settings_e(wps, &eattr, decrypted,
1104                                       attr->version2 != NULL)) {
1105                 wpabuf_free(decrypted);
1106                 wps->state = SEND_WSC_NACK;
1107                 return WPS_CONTINUE;
1108         }
1109         wpabuf_free(decrypted);
1110
1111         wps->state = WPS_MSG_DONE;
1112         return WPS_CONTINUE;
1113 }
1114
1115
1116 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1117                                                 const struct wpabuf *msg)
1118 {
1119         struct wps_parse_attr attr;
1120         enum wps_process_res ret = WPS_CONTINUE;
1121
1122         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1123
1124         if (wps_parse_msg(msg, &attr) < 0)
1125                 return WPS_FAILURE;
1126
1127         if (attr.enrollee_nonce == NULL ||
1128             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1129                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1130                 return WPS_FAILURE;
1131         }
1132
1133         if (attr.msg_type == NULL) {
1134                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1135                 return WPS_FAILURE;
1136         }
1137
1138         switch (*attr.msg_type) {
1139         case WPS_M2:
1140                 if (wps_validate_m2(msg) < 0)
1141                         return WPS_FAILURE;
1142                 ret = wps_process_m2(wps, msg, &attr);
1143                 break;
1144         case WPS_M2D:
1145                 if (wps_validate_m2d(msg) < 0)
1146                         return WPS_FAILURE;
1147                 ret = wps_process_m2d(wps, &attr);
1148                 break;
1149         case WPS_M4:
1150                 if (wps_validate_m4(msg) < 0)
1151                         return WPS_FAILURE;
1152                 ret = wps_process_m4(wps, msg, &attr);
1153                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1154                         wps_fail_event(wps->wps, WPS_M4, wps->config_error);
1155                 break;
1156         case WPS_M6:
1157                 if (wps_validate_m6(msg) < 0)
1158                         return WPS_FAILURE;
1159                 ret = wps_process_m6(wps, msg, &attr);
1160                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1161                         wps_fail_event(wps->wps, WPS_M6, wps->config_error);
1162                 break;
1163         case WPS_M8:
1164                 if (wps_validate_m8(msg) < 0)
1165                         return WPS_FAILURE;
1166                 ret = wps_process_m8(wps, msg, &attr);
1167                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1168                         wps_fail_event(wps->wps, WPS_M8, wps->config_error);
1169                 break;
1170         default:
1171                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1172                            *attr.msg_type);
1173                 return WPS_FAILURE;
1174         }
1175
1176         /*
1177          * Save a copy of the last message for Authenticator derivation if we
1178          * are continuing. However, skip M2D since it is not authenticated and
1179          * neither is the ACK/NACK response frame. This allows the possibly
1180          * following M2 to be processed correctly by using the previously sent
1181          * M1 in Authenticator derivation.
1182          */
1183         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1184                 /* Save a copy of the last message for Authenticator derivation
1185                  */
1186                 wpabuf_free(wps->last_msg);
1187                 wps->last_msg = wpabuf_dup(msg);
1188         }
1189
1190         return ret;
1191 }
1192
1193
1194 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1195                                                 const struct wpabuf *msg)
1196 {
1197         struct wps_parse_attr attr;
1198
1199         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1200
1201         if (wps_parse_msg(msg, &attr) < 0)
1202                 return WPS_FAILURE;
1203
1204         if (attr.msg_type == NULL) {
1205                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1206                 return WPS_FAILURE;
1207         }
1208
1209         if (*attr.msg_type != WPS_WSC_ACK) {
1210                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1211                            *attr.msg_type);
1212                 return WPS_FAILURE;
1213         }
1214
1215         if (attr.registrar_nonce == NULL ||
1216             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1217         {
1218                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1219                 return WPS_FAILURE;
1220         }
1221
1222         if (attr.enrollee_nonce == NULL ||
1223             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1224                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1225                 return WPS_FAILURE;
1226         }
1227
1228         if (wps->state == RECV_ACK && wps->wps->ap) {
1229                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1230                            "completed successfully");
1231                 wps_success_event(wps->wps);
1232                 wps->state = WPS_FINISHED;
1233                 return WPS_DONE;
1234         }
1235
1236         return WPS_FAILURE;
1237 }
1238
1239
1240 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1241                                                  const struct wpabuf *msg)
1242 {
1243         struct wps_parse_attr attr;
1244         u16 config_error;
1245
1246         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1247
1248         if (wps_parse_msg(msg, &attr) < 0)
1249                 return WPS_FAILURE;
1250
1251         if (attr.msg_type == NULL) {
1252                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1253                 return WPS_FAILURE;
1254         }
1255
1256         if (*attr.msg_type != WPS_WSC_NACK) {
1257                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1258                            *attr.msg_type);
1259                 return WPS_FAILURE;
1260         }
1261
1262         if (attr.registrar_nonce == NULL ||
1263             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1264         {
1265                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1266                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1267                             attr.registrar_nonce, WPS_NONCE_LEN);
1268                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1269                             wps->nonce_r, WPS_NONCE_LEN);
1270                 return WPS_FAILURE;
1271         }
1272
1273         if (attr.enrollee_nonce == NULL ||
1274             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1275                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1276                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1277                             attr.enrollee_nonce, WPS_NONCE_LEN);
1278                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1279                             wps->nonce_e, WPS_NONCE_LEN);
1280                 return WPS_FAILURE;
1281         }
1282
1283         if (attr.config_error == NULL) {
1284                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1285                            "in WSC_NACK");
1286                 return WPS_FAILURE;
1287         }
1288
1289         config_error = WPA_GET_BE16(attr.config_error);
1290         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1291                    "Configuration Error %d", config_error);
1292
1293         switch (wps->state) {
1294         case RECV_M4:
1295                 wps_fail_event(wps->wps, WPS_M3, config_error);
1296                 break;
1297         case RECV_M6:
1298                 wps_fail_event(wps->wps, WPS_M5, config_error);
1299                 break;
1300         case RECV_M8:
1301                 wps_fail_event(wps->wps, WPS_M7, config_error);
1302                 break;
1303         default:
1304                 break;
1305         }
1306
1307         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1308          * Enrollee is Authenticator */
1309         wps->state = SEND_WSC_NACK;
1310
1311         return WPS_FAILURE;
1312 }
1313
1314
1315 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1316                                               enum wsc_op_code op_code,
1317                                               const struct wpabuf *msg)
1318 {
1319
1320         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1321                    "op_code=%d)",
1322                    (unsigned long) wpabuf_len(msg), op_code);
1323
1324         if (op_code == WSC_UPnP) {
1325                 /* Determine the OpCode based on message type attribute */
1326                 struct wps_parse_attr attr;
1327                 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1328                         if (*attr.msg_type == WPS_WSC_ACK)
1329                                 op_code = WSC_ACK;
1330                         else if (*attr.msg_type == WPS_WSC_NACK)
1331                                 op_code = WSC_NACK;
1332                 }
1333         }
1334
1335         switch (op_code) {
1336         case WSC_MSG:
1337         case WSC_UPnP:
1338                 return wps_process_wsc_msg(wps, msg);
1339         case WSC_ACK:
1340                 if (wps_validate_wsc_ack(msg) < 0)
1341                         return WPS_FAILURE;
1342                 return wps_process_wsc_ack(wps, msg);
1343         case WSC_NACK:
1344                 if (wps_validate_wsc_nack(msg) < 0)
1345                         return WPS_FAILURE;
1346                 return wps_process_wsc_nack(wps, msg);
1347         default:
1348                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1349                 return WPS_FAILURE;
1350         }
1351 }