src/wps/wps_enrollee.c

   1 /*
   2  * Wi-Fi Protected Setup - Enrollee
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "sha256.h"
  19 #include "wps_i.h"
  20 #include "wps_dev_attr.h"
  21
  22
  23 static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg)
  24 {
  25         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address");
  26         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
  27         wpabuf_put_be16(msg, ETH_ALEN);
  28         wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN);
  29         return 0;
  30 }
  31
  32
  33 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
  34 {
  35         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State");
  36         wpabuf_put_be16(msg, ATTR_WPS_STATE);
  37         wpabuf_put_be16(msg, 1);
  38         wpabuf_put_u8(msg, WPS_STATE_CONFIGURED);
  39         return 0;
  40 }
  41
  42
  43 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg)
  44 {
  45         u8 *hash;
  46         const u8 *addr[4];
  47         size_t len[4];
  48
  49         if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
  50                 return -1;
  51         wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
  52         wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
  53                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
  54
  55         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
  56                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
  57                            "E-Hash derivation");
  58                 return -1;
  59         }
  60
  61         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash1");
  62         wpabuf_put_be16(msg, ATTR_E_HASH1);
  63         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  64         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  65         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
  66         addr[0] = wps->snonce;
  67         len[0] = WPS_SECRET_NONCE_LEN;
  68         addr[1] = wps->psk1;
  69         len[1] = WPS_PSK_LEN;
  70         addr[2] = wpabuf_head(wps->dh_pubkey_e);
  71         len[2] = wpabuf_len(wps->dh_pubkey_e);
  72         addr[3] = wpabuf_head(wps->dh_pubkey_r);
  73         len[3] = wpabuf_len(wps->dh_pubkey_r);
  74         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  75         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
  76
  77         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash2");
  78         wpabuf_put_be16(msg, ATTR_E_HASH2);
  79         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  80         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  81         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
  82         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
  83         addr[1] = wps->psk2;
  84         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  85         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
  86
  87         return 0;
  88 }
  89
  90
  91 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
  92 {
  93         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce1");
  94         wpabuf_put_be16(msg, ATTR_E_SNONCE1);
  95         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
  96         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
  97         return 0;
  98 }
  99
 100
 101 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
 102 {
 103         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce2");
 104         wpabuf_put_be16(msg, ATTR_E_SNONCE2);
 105         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
 106         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
 107                         WPS_SECRET_NONCE_LEN);
 108         return 0;
 109 }
 110
 111
 112 static struct wpabuf * wps_build_m1(struct wps_data *wps)
 113 {
 114         struct wpabuf *msg;
 115         u16 methods;
 116
 117         if (os_get_random(wps->nonce_e, WPS_NONCE_LEN) < 0)
 118                 return NULL;
 119         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
 120                     wps->nonce_e, WPS_NONCE_LEN);
 121
 122         wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
 123         msg = wpabuf_alloc(1000);
 124         if (msg == NULL)
 125                 return NULL;
 126
 127         methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
 128         if (wps->pbc)
 129                 methods |= WPS_CONFIG_PUSHBUTTON;
 130
 131         if (wps_build_version(msg) ||
 132             wps_build_msg_type(msg, WPS_M1) ||
 133             wps_build_uuid_e(msg, wps->uuid_e) ||
 134             wps_build_mac_addr(wps, msg) ||
 135             wps_build_enrollee_nonce(wps, msg) ||
 136             wps_build_public_key(wps, msg) ||
 137             wps_build_auth_type_flags(wps, msg) ||
 138             wps_build_encr_type_flags(wps, msg) ||
 139             wps_build_conn_type_flags(wps, msg) ||
 140             wps_build_config_methods(msg, methods) ||
 141             wps_build_wps_state(wps, msg) ||
 142             wps_build_device_attrs(&wps->wps->dev, msg) ||
 143             wps_build_rf_bands(&wps->wps->dev, msg) ||
 144             wps_build_assoc_state(wps, msg) ||
 145             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
 146             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 147             wps_build_os_version(&wps->wps->dev, msg)) {
 148                 wpabuf_free(msg);
 149                 return NULL;
 150         }
 151
 152         wps->state = RECV_M2;
 153         return msg;
 154 }
 155
 156
 157 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 158 {
 159         struct wpabuf *msg;
 160
 161         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 162
 163         if (wps->dev_password == NULL) {
 164                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 165                 return NULL;
 166         }
 167         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 168
 169         msg = wpabuf_alloc(1000);
 170         if (msg == NULL)
 171                 return NULL;
 172
 173         if (wps_build_version(msg) ||
 174             wps_build_msg_type(msg, WPS_M3) ||
 175             wps_build_registrar_nonce(wps, msg) ||
 176             wps_build_e_hash(wps, msg) ||
 177             wps_build_authenticator(wps, msg)) {
 178                 wpabuf_free(msg);
 179                 return NULL;
 180         }
 181
 182         wps->state = RECV_M4;
 183         return msg;
 184 }
 185
 186
 187 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 188 {
 189         struct wpabuf *msg, *plain;
 190
 191         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 192
 193         plain = wpabuf_alloc(200);
 194         if (plain == NULL)
 195                 return NULL;
 196
 197         msg = wpabuf_alloc(1000);
 198         if (msg == NULL) {
 199                 wpabuf_free(plain);
 200                 return NULL;
 201         }
 202
 203         if (wps_build_version(msg) ||
 204             wps_build_msg_type(msg, WPS_M5) ||
 205             wps_build_registrar_nonce(wps, msg) ||
 206             wps_build_e_snonce1(wps, plain) ||
 207             wps_build_key_wrap_auth(wps, plain) ||
 208             wps_build_encr_settings(wps, msg, plain) ||
 209             wps_build_authenticator(wps, msg)) {
 210                 wpabuf_free(plain);
 211                 wpabuf_free(msg);
 212                 return NULL;
 213         }
 214         wpabuf_free(plain);
 215
 216         wps->state = RECV_M6;
 217         return msg;
 218 }
 219
 220
 221 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 222 {
 223         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 224         wpabuf_put_be16(msg, ATTR_SSID);
 225         wpabuf_put_be16(msg, wps->wps->ssid_len);
 226         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 227         return 0;
 228 }
 229
 230
 231 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 232 {
 233         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
 234         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 235         wpabuf_put_be16(msg, 2);
 236         wpabuf_put_be16(msg, wps->wps->auth_types);
 237         return 0;
 238 }
 239
 240
 241 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 242 {
 243         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
 244         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 245         wpabuf_put_be16(msg, 2);
 246         wpabuf_put_be16(msg, wps->wps->encr_types);
 247         return 0;
 248 }
 249
 250
 251 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 252 {
 253         wpa_printf(MSG_DEBUG, "WPS:  * Network Key");
 254         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 255         wpabuf_put_be16(msg, wps->wps->network_key_len);
 256         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 257         return 0;
 258 }
 259
 260
 261 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 262 {
 263         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 264         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 265         wpabuf_put_be16(msg, ETH_ALEN);
 266         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 267         return 0;
 268 }
 269
 270
 271 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 272 {
 273         struct wpabuf *msg, *plain;
 274
 275         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 276
 277         plain = wpabuf_alloc(500);
 278         if (plain == NULL)
 279                 return NULL;
 280
 281         msg = wpabuf_alloc(1000);
 282         if (msg == NULL) {
 283                 wpabuf_free(plain);
 284                 return NULL;
 285         }
 286
 287         if (wps_build_version(msg) ||
 288             wps_build_msg_type(msg, WPS_M7) ||
 289             wps_build_registrar_nonce(wps, msg) ||
 290             wps_build_e_snonce2(wps, plain) ||
 291             (wps->authenticator &&
 292              (wps_build_cred_ssid(wps, plain) ||
 293               wps_build_cred_mac_addr(wps, plain) ||
 294               wps_build_cred_auth_type(wps, plain) ||
 295               wps_build_cred_encr_type(wps, plain) ||
 296               wps_build_cred_network_key(wps, plain))) ||
 297             wps_build_key_wrap_auth(wps, plain) ||
 298             wps_build_encr_settings(wps, msg, plain) ||
 299             wps_build_authenticator(wps, msg)) {
 300                 wpabuf_free(plain);
 301                 wpabuf_free(msg);
 302                 return NULL;
 303         }
 304         wpabuf_free(plain);
 305
 306         wps->state = RECV_M8;
 307         return msg;
 308 }
 309
 310
 311 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 312 {
 313         struct wpabuf *msg;
 314
 315         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 316
 317         msg = wpabuf_alloc(1000);
 318         if (msg == NULL)
 319                 return NULL;
 320
 321         if (wps_build_version(msg) ||
 322             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 323             wps_build_enrollee_nonce(wps, msg) ||
 324             wps_build_registrar_nonce(wps, msg)) {
 325                 wpabuf_free(msg);
 326                 return NULL;
 327         }
 328
 329         if (wps->authenticator)
 330                 wps->state = RECV_ACK;
 331         else {
 332                 wps_success_event(wps->wps);
 333                 wps->state = WPS_FINISHED;
 334         }
 335         return msg;
 336 }
 337
 338
 339 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
 340 {
 341         struct wpabuf *msg;
 342
 343         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");
 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_ACK) ||
 351             wps_build_enrollee_nonce(wps, msg) ||
 352             wps_build_registrar_nonce(wps, msg)) {
 353                 wpabuf_free(msg);
 354                 return NULL;
 355         }
 356
 357         return msg;
 358 }
 359
 360
 361 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
 362 {
 363         struct wpabuf *msg;
 364
 365         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");
 366
 367         msg = wpabuf_alloc(1000);
 368         if (msg == NULL)
 369                 return NULL;
 370
 371         if (wps_build_version(msg) ||
 372             wps_build_msg_type(msg, WPS_WSC_NACK) ||
 373             wps_build_enrollee_nonce(wps, msg) ||
 374             wps_build_registrar_nonce(wps, msg) ||
 375             wps_build_config_error(msg, wps->config_error)) {
 376                 wpabuf_free(msg);
 377                 return NULL;
 378         }
 379
 380         return msg;
 381 }
 382
 383
 384 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, u8 *op_code)
 385 {
 386         struct wpabuf *msg;
 387
 388         switch (wps->state) {
 389         case SEND_M1:
 390                 msg = wps_build_m1(wps);
 391                 *op_code = WSC_MSG;
 392                 break;
 393         case SEND_M3:
 394                 msg = wps_build_m3(wps);
 395                 *op_code = WSC_MSG;
 396                 break;
 397         case SEND_M5:
 398                 msg = wps_build_m5(wps);
 399                 *op_code = WSC_MSG;
 400                 break;
 401         case SEND_M7:
 402                 msg = wps_build_m7(wps);
 403                 *op_code = WSC_MSG;
 404                 break;
 405         case RECEIVED_M2D:
 406                 if (wps->authenticator) {
 407                         msg = wps_build_wsc_nack(wps);
 408                         *op_code = WSC_NACK;
 409                         break;
 410                 }
 411                 msg = wps_build_wsc_ack(wps);
 412                 *op_code = WSC_ACK;
 413                 if (msg) {
 414                         /* Another M2/M2D may be received */
 415                         wps->state = RECV_M2;
 416                 }
 417                 break;
 418         case SEND_WSC_NACK:
 419                 msg = wps_build_wsc_nack(wps);
 420                 *op_code = WSC_NACK;
 421                 break;
 422         case WPS_MSG_DONE:
 423                 msg = wps_build_wsc_done(wps);
 424                 *op_code = WSC_Done;
 425                 break;
 426         default:
 427                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 428                            "a message", wps->state);
 429                 msg = NULL;
 430                 break;
 431         }
 432
 433         if (*op_code == WSC_MSG && msg) {
 434                 /* Save a copy of the last message for Authenticator derivation
 435                  */
 436                 wpabuf_free(wps->last_msg);
 437                 wps->last_msg = wpabuf_dup(msg);
 438         }
 439
 440         return msg;
 441 }
 442
 443
 444 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 445 {
 446         if (r_nonce == NULL) {
 447                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 448                 return -1;
 449         }
 450
 451         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 452         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 453                     wps->nonce_r, WPS_NONCE_LEN);
 454
 455         return 0;
 456 }
 457
 458
 459 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 460 {
 461         if (e_nonce == NULL) {
 462                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 463                 return -1;
 464         }
 465
 466         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 467                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 468                 return -1;
 469         }
 470
 471         return 0;
 472 }
 473
 474
 475 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 476 {
 477         if (uuid_r == NULL) {
 478                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 479                 return -1;
 480         }
 481
 482         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 483         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 484
 485         return 0;
 486 }
 487
 488
 489 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 490                               size_t pk_len)
 491 {
 492         if (pk == NULL || pk_len == 0) {
 493                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 494                 return -1;
 495         }
 496
 497         wpabuf_free(wps->dh_pubkey_r);
 498         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 499         if (wps->dh_pubkey_r == NULL)
 500                 return -1;
 501
 502         if (wps_derive_keys(wps) < 0)
 503                 return -1;
 504
 505         if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
 506             wps_derive_mgmt_keys(wps) < 0)
 507                 return -1;
 508
 509         return 0;
 510 }
 511
 512
 513 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 514 {
 515         if (r_hash1 == NULL) {
 516                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 517                 return -1;
 518         }
 519
 520         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 521         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 522
 523         return 0;
 524 }
 525
 526
 527 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 528 {
 529         if (r_hash2 == NULL) {
 530                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 531                 return -1;
 532         }
 533
 534         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 535         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 536
 537         return 0;
 538 }
 539
 540
 541 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 542 {
 543         u8 hash[SHA256_MAC_LEN];
 544         const u8 *addr[4];
 545         size_t len[4];
 546
 547         if (r_snonce1 == NULL) {
 548                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 549                 return -1;
 550         }
 551
 552         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 553                         WPS_SECRET_NONCE_LEN);
 554
 555         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 556         addr[0] = r_snonce1;
 557         len[0] = WPS_SECRET_NONCE_LEN;
 558         addr[1] = wps->psk1;
 559         len[1] = WPS_PSK_LEN;
 560         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 561         len[2] = wpabuf_len(wps->dh_pubkey_e);
 562         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 563         len[3] = wpabuf_len(wps->dh_pubkey_r);
 564         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 565
 566         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 567                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 568                            "not match with the pre-committed value");
 569                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 570                 return -1;
 571         }
 572
 573         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 574                    "half of the device password");
 575
 576         return 0;
 577 }
 578
 579
 580 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 581 {
 582         u8 hash[SHA256_MAC_LEN];
 583         const u8 *addr[4];
 584         size_t len[4];
 585
 586         if (r_snonce2 == NULL) {
 587                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 588                 return -1;
 589         }
 590
 591         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 592                         WPS_SECRET_NONCE_LEN);
 593
 594         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 595         addr[0] = r_snonce2;
 596         len[0] = WPS_SECRET_NONCE_LEN;
 597         addr[1] = wps->psk2;
 598         len[1] = WPS_PSK_LEN;
 599         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 600         len[2] = wpabuf_len(wps->dh_pubkey_e);
 601         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 602         len[3] = wpabuf_len(wps->dh_pubkey_r);
 603         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 604
 605         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 606                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 607                            "not match with the pre-committed value");
 608                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 609                 return -1;
 610         }
 611
 612         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 613                    "half of the device password");
 614
 615         return 0;
 616 }
 617
 618
 619 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 620                               size_t cred_len)
 621 {
 622         struct wps_parse_attr attr;
 623         struct wpabuf msg;
 624
 625         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 626         os_memset(&wps->cred, 0, sizeof(wps->cred));
 627         wpabuf_set(&msg, cred, cred_len);
 628         if (wps_parse_msg(&msg, &attr) < 0 ||
 629             wps_process_cred(&attr, &wps->cred))
 630                 return -1;
 631
 632         if (wps->wps->cred_cb)
 633                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 634
 635         return 0;
 636 }
 637
 638
 639 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 640                              size_t cred_len[], size_t num_cred)
 641 {
 642         size_t i;
 643
 644         if (wps->authenticator)
 645                 return 0;
 646
 647         if (num_cred == 0) {
 648                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 649                            "received");
 650                 return -1;
 651         }
 652
 653         for (i = 0; i < num_cred; i++) {
 654                 if (wps_process_cred_e(wps, cred[i], cred_len[i]))
 655                         return -1;
 656         }
 657
 658         return 0;
 659 }
 660
 661
 662 static int wps_process_ap_settings_e(struct wps_data *wps,
 663                                      struct wps_parse_attr *attr)
 664 {
 665         struct wps_credential cred;
 666
 667         if (!wps->authenticator)
 668                 return 0;
 669
 670         if (wps_process_ap_settings(attr, &cred) < 0)
 671                 return -1;
 672
 673         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 674                    "Registrar");
 675
 676         if (wps->wps->cred_cb)
 677                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 678
 679         return 0;
 680 }
 681
 682
 683 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 684                                            const struct wpabuf *msg,
 685                                            struct wps_parse_attr *attr)
 686 {
 687         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 688
 689         if (wps->state != RECV_M2) {
 690                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 691                            "receiving M2", wps->state);
 692                 wps->state = SEND_WSC_NACK;
 693                 return WPS_CONTINUE;
 694         }
 695
 696         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 697             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 698             wps_process_uuid_r(wps, attr->uuid_r) ||
 699             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 700             wps_process_authenticator(wps, attr->authenticator, msg)) {
 701                 wps->state = SEND_WSC_NACK;
 702                 return WPS_CONTINUE;
 703         }
 704
 705         if (wps->authenticator && wps->wps->ap_setup_locked) {
 706                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 707                            "registration of a new Registrar");
 708                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 709                 wps->state = SEND_WSC_NACK;
 710                 return WPS_CONTINUE;
 711         }
 712
 713         wps->state = SEND_M3;
 714         return WPS_CONTINUE;
 715 }
 716
 717
 718 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 719                                             struct wps_parse_attr *attr)
 720 {
 721         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 722
 723         if (wps->state != RECV_M2) {
 724                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 725                            "receiving M2D", wps->state);
 726                 wps->state = SEND_WSC_NACK;
 727                 return WPS_CONTINUE;
 728         }
 729
 730         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 731                           attr->manufacturer, attr->manufacturer_len);
 732         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 733                           attr->model_name, attr->model_name_len);
 734         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 735                           attr->model_number, attr->model_number_len);
 736         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 737                           attr->serial_number, attr->serial_number_len);
 738         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 739                           attr->dev_name, attr->dev_name_len);
 740
 741         if (wps->wps->event_cb) {
 742                 union wps_event_data data;
 743                 struct wps_event_m2d *m2d = &data.m2d;
 744                 os_memset(&data, 0, sizeof(data));
 745                 if (attr->config_methods)
 746                         m2d->config_methods =
 747                                 WPA_GET_BE16(attr->config_methods);
 748                 m2d->manufacturer = attr->manufacturer;
 749                 m2d->manufacturer_len = attr->manufacturer_len;
 750                 m2d->model_name = attr->model_name;
 751                 m2d->model_name_len = attr->model_name_len;
 752                 m2d->model_number = attr->model_number;
 753                 m2d->model_number_len = attr->model_number_len;
 754                 m2d->serial_number = attr->serial_number;
 755                 m2d->serial_number_len = attr->serial_number_len;
 756                 m2d->dev_name = attr->dev_name;
 757                 m2d->dev_name_len = attr->dev_name_len;
 758                 m2d->primary_dev_type = attr->primary_dev_type;
 759                 if (attr->config_error)
 760                         m2d->config_error =
 761                                 WPA_GET_BE16(attr->config_error);
 762                 if (attr->dev_password_id)
 763                         m2d->dev_password_id =
 764                                 WPA_GET_BE16(attr->dev_password_id);
 765                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 766         }
 767
 768         wps->state = RECEIVED_M2D;
 769         return WPS_CONTINUE;
 770 }
 771
 772
 773 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 774                                            const struct wpabuf *msg,
 775                                            struct wps_parse_attr *attr)
 776 {
 777         struct wpabuf *decrypted;
 778         struct wps_parse_attr eattr;
 779
 780         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 781
 782         if (wps->state != RECV_M4) {
 783                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 784                            "receiving M4", wps->state);
 785                 wps->state = SEND_WSC_NACK;
 786                 return WPS_CONTINUE;
 787         }
 788
 789         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 790             wps_process_authenticator(wps, attr->authenticator, msg) ||
 791             wps_process_r_hash1(wps, attr->r_hash1) ||
 792             wps_process_r_hash2(wps, attr->r_hash2)) {
 793                 wps->state = SEND_WSC_NACK;
 794                 return WPS_CONTINUE;
 795         }
 796
 797         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 798                                               attr->encr_settings_len);
 799         if (decrypted == NULL) {
 800                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 801                            "Settings attribute");
 802                 wps->state = SEND_WSC_NACK;
 803                 return WPS_CONTINUE;
 804         }
 805
 806         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 807                    "attribute");
 808         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 809             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 810             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 811                 wpabuf_free(decrypted);
 812                 wps->state = SEND_WSC_NACK;
 813                 return WPS_CONTINUE;
 814         }
 815         wpabuf_free(decrypted);
 816
 817         wps->state = SEND_M5;
 818         return WPS_CONTINUE;
 819 }
 820
 821
 822 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 823                                            const struct wpabuf *msg,
 824                                            struct wps_parse_attr *attr)
 825 {
 826         struct wpabuf *decrypted;
 827         struct wps_parse_attr eattr;
 828
 829         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 830
 831         if (wps->state != RECV_M6) {
 832                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 833                            "receiving M6", wps->state);
 834                 wps->state = SEND_WSC_NACK;
 835                 return WPS_CONTINUE;
 836         }
 837
 838         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 839             wps_process_authenticator(wps, attr->authenticator, msg)) {
 840                 wps->state = SEND_WSC_NACK;
 841                 return WPS_CONTINUE;
 842         }
 843
 844         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 845                                               attr->encr_settings_len);
 846         if (decrypted == NULL) {
 847                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 848                            "Settings attribute");
 849                 wps->state = SEND_WSC_NACK;
 850                 return WPS_CONTINUE;
 851         }
 852
 853         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 854                    "attribute");
 855         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 856             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 857             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 858                 wpabuf_free(decrypted);
 859                 wps->state = SEND_WSC_NACK;
 860                 return WPS_CONTINUE;
 861         }
 862         wpabuf_free(decrypted);
 863
 864         wps->state = SEND_M7;
 865         return WPS_CONTINUE;
 866 }
 867
 868
 869 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 870                                            const struct wpabuf *msg,
 871                                            struct wps_parse_attr *attr)
 872 {
 873         struct wpabuf *decrypted;
 874         struct wps_parse_attr eattr;
 875
 876         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 877
 878         if (wps->state != RECV_M8) {
 879                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 880                            "receiving M8", wps->state);
 881                 wps->state = SEND_WSC_NACK;
 882                 return WPS_CONTINUE;
 883         }
 884
 885         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 886             wps_process_authenticator(wps, attr->authenticator, msg)) {
 887                 wps->state = SEND_WSC_NACK;
 888                 return WPS_CONTINUE;
 889         }
 890
 891         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 892                                               attr->encr_settings_len);
 893         if (decrypted == NULL) {
 894                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 895                            "Settings attribute");
 896                 wps->state = SEND_WSC_NACK;
 897                 return WPS_CONTINUE;
 898         }
 899
 900         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 901                    "attribute");
 902         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 903             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 904             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 905                               eattr.num_cred) ||
 906             wps_process_ap_settings_e(wps, &eattr)) {
 907                 wpabuf_free(decrypted);
 908                 wps->state = SEND_WSC_NACK;
 909                 return WPS_CONTINUE;
 910         }
 911         wpabuf_free(decrypted);
 912
 913         wps->state = WPS_MSG_DONE;
 914         return WPS_CONTINUE;
 915 }
 916
 917
 918 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
 919                                                 const struct wpabuf *msg)
 920 {
 921         struct wps_parse_attr attr;
 922         enum wps_process_res ret = WPS_CONTINUE;
 923
 924         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
 925
 926         if (wps_parse_msg(msg, &attr) < 0)
 927                 return WPS_FAILURE;
 928
 929         if (attr.version == NULL || *attr.version != WPS_VERSION) {
 930                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 931                            attr.version ? *attr.version : 0);
 932                 return WPS_FAILURE;
 933         }
 934
 935         if (attr.enrollee_nonce == NULL ||
 936             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
 937                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
 938                 return WPS_FAILURE;
 939         }
 940
 941         if (attr.msg_type == NULL) {
 942                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
 943                 return WPS_FAILURE;
 944         }
 945
 946         switch (*attr.msg_type) {
 947         case WPS_M2:
 948                 ret = wps_process_m2(wps, msg, &attr);
 949                 break;
 950         case WPS_M2D:
 951                 ret = wps_process_m2d(wps, &attr);
 952                 break;
 953         case WPS_M4:
 954                 ret = wps_process_m4(wps, msg, &attr);
 955                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 956                         wps_fail_event(wps->wps, WPS_M4);
 957                 break;
 958         case WPS_M6:
 959                 ret = wps_process_m6(wps, msg, &attr);
 960                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 961                         wps_fail_event(wps->wps, WPS_M6);
 962                 break;
 963         case WPS_M8:
 964                 ret = wps_process_m8(wps, msg, &attr);
 965                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 966                         wps_fail_event(wps->wps, WPS_M8);
 967                 break;
 968         default:
 969                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
 970                            *attr.msg_type);
 971                 return WPS_FAILURE;
 972         }
 973
 974         if (ret == WPS_CONTINUE) {
 975                 /* Save a copy of the last message for Authenticator derivation
 976                  */
 977                 wpabuf_free(wps->last_msg);
 978                 wps->last_msg = wpabuf_dup(msg);
 979         }
 980
 981         return ret;
 982 }
 983
 984
 985 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
 986                                                 const struct wpabuf *msg)
 987 {
 988         struct wps_parse_attr attr;
 989
 990         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
 991
 992         if (wps_parse_msg(msg, &attr) < 0)
 993                 return WPS_FAILURE;
 994
 995         if (attr.version == NULL || *attr.version != WPS_VERSION) {
 996                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 997                            attr.version ? *attr.version : 0);
 998                 return WPS_FAILURE;
 999         }
1000
1001         if (attr.msg_type == NULL) {
1002                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1003                 return WPS_FAILURE;
1004         }
1005
1006         if (*attr.msg_type != WPS_WSC_ACK) {
1007                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1008                            *attr.msg_type);
1009                 return WPS_FAILURE;
1010         }
1011
1012         if (attr.registrar_nonce == NULL ||
1013             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1014         {
1015                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1016                 return WPS_FAILURE;
1017         }
1018
1019         if (attr.enrollee_nonce == NULL ||
1020             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1021                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1022                 return WPS_FAILURE;
1023         }
1024
1025         if (wps->state == RECV_ACK && wps->authenticator) {
1026                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1027                            "completed successfully");
1028                 wps_success_event(wps->wps);
1029                 wps->state = WPS_FINISHED;
1030                 return WPS_DONE;
1031         }
1032
1033         return WPS_FAILURE;
1034 }
1035
1036
1037 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1038                                                  const struct wpabuf *msg)
1039 {
1040         struct wps_parse_attr attr;
1041
1042         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1043
1044         if (wps_parse_msg(msg, &attr) < 0)
1045                 return WPS_FAILURE;
1046
1047         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1048                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1049                            attr.version ? *attr.version : 0);
1050                 return WPS_FAILURE;
1051         }
1052
1053         if (attr.msg_type == NULL) {
1054                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1055                 return WPS_FAILURE;
1056         }
1057
1058         if (*attr.msg_type != WPS_WSC_NACK) {
1059                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1060                            *attr.msg_type);
1061                 return WPS_FAILURE;
1062         }
1063
1064         if (attr.registrar_nonce == NULL ||
1065             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1066         {
1067                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1068                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1069                             attr.registrar_nonce, WPS_NONCE_LEN);
1070                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1071                             wps->nonce_r, WPS_NONCE_LEN);
1072                 return WPS_FAILURE;
1073         }
1074
1075         if (attr.enrollee_nonce == NULL ||
1076             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1077                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1078                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1079                             attr.enrollee_nonce, WPS_NONCE_LEN);
1080                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1081                             wps->nonce_e, WPS_NONCE_LEN);
1082                 return WPS_FAILURE;
1083         }
1084
1085         if (attr.config_error == NULL) {
1086                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1087                            "in WSC_NACK");
1088                 return WPS_FAILURE;
1089         }
1090
1091         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1092                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1093
1094         switch (wps->state) {
1095         case RECV_M4:
1096                 wps_fail_event(wps->wps, WPS_M3);
1097                 break;
1098         case RECV_M6:
1099                 wps_fail_event(wps->wps, WPS_M5);
1100                 break;
1101         case RECV_M8:
1102                 wps_fail_event(wps->wps, WPS_M7);
1103                 break;
1104         default:
1105                 break;
1106         }
1107
1108         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1109          * Enrollee is Authenticator */
1110         wps->state = SEND_WSC_NACK;
1111
1112         return WPS_FAILURE;
1113 }
1114
1115
1116 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, u8 op_code,
1117                                               const struct wpabuf *msg)
1118 {
1119
1120         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1121                    "op_code=%d)",
1122                    (unsigned long) wpabuf_len(msg), op_code);
1123
1124         switch (op_code) {
1125         case WSC_MSG:
1126                 return wps_process_wsc_msg(wps, msg);
1127         case WSC_ACK:
1128                 return wps_process_wsc_ack(wps, msg);
1129         case WSC_NACK:
1130                 return wps_process_wsc_nack(wps, msg);
1131         default:
1132                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1133                 return WPS_FAILURE;
1134         }
1135 }