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