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->wps->ap &&
 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->wps->ap)
 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,
 385                                      enum wsc_op_code *op_code)
 386 {
 387         struct wpabuf *msg;
 388
 389         switch (wps->state) {
 390         case SEND_M1:
 391                 msg = wps_build_m1(wps);
 392                 *op_code = WSC_MSG;
 393                 break;
 394         case SEND_M3:
 395                 msg = wps_build_m3(wps);
 396                 *op_code = WSC_MSG;
 397                 break;
 398         case SEND_M5:
 399                 msg = wps_build_m5(wps);
 400                 *op_code = WSC_MSG;
 401                 break;
 402         case SEND_M7:
 403                 msg = wps_build_m7(wps);
 404                 *op_code = WSC_MSG;
 405                 break;
 406         case RECEIVED_M2D:
 407                 if (wps->wps->ap) {
 408                         msg = wps_build_wsc_nack(wps);
 409                         *op_code = WSC_NACK;
 410                         break;
 411                 }
 412                 msg = wps_build_wsc_ack(wps);
 413                 *op_code = WSC_ACK;
 414                 if (msg) {
 415                         /* Another M2/M2D may be received */
 416                         wps->state = RECV_M2;
 417                 }
 418                 break;
 419         case SEND_WSC_NACK:
 420                 msg = wps_build_wsc_nack(wps);
 421                 *op_code = WSC_NACK;
 422                 break;
 423         case WPS_MSG_DONE:
 424                 msg = wps_build_wsc_done(wps);
 425                 *op_code = WSC_Done;
 426                 break;
 427         default:
 428                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 429                            "a message", wps->state);
 430                 msg = NULL;
 431                 break;
 432         }
 433
 434         if (*op_code == WSC_MSG && msg) {
 435                 /* Save a copy of the last message for Authenticator derivation
 436                  */
 437                 wpabuf_free(wps->last_msg);
 438                 wps->last_msg = wpabuf_dup(msg);
 439         }
 440
 441         return msg;
 442 }
 443
 444
 445 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 446 {
 447         if (r_nonce == NULL) {
 448                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 449                 return -1;
 450         }
 451
 452         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 453         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 454                     wps->nonce_r, WPS_NONCE_LEN);
 455
 456         return 0;
 457 }
 458
 459
 460 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 461 {
 462         if (e_nonce == NULL) {
 463                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 464                 return -1;
 465         }
 466
 467         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 468                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 469                 return -1;
 470         }
 471
 472         return 0;
 473 }
 474
 475
 476 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 477 {
 478         if (uuid_r == NULL) {
 479                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 480                 return -1;
 481         }
 482
 483         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 484         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 485
 486         return 0;
 487 }
 488
 489
 490 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 491                               size_t pk_len)
 492 {
 493         if (pk == NULL || pk_len == 0) {
 494                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 495                 return -1;
 496         }
 497
 498         wpabuf_free(wps->dh_pubkey_r);
 499         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 500         if (wps->dh_pubkey_r == NULL)
 501                 return -1;
 502
 503         if (wps_derive_keys(wps) < 0)
 504                 return -1;
 505
 506         if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
 507             wps_derive_mgmt_keys(wps) < 0)
 508                 return -1;
 509
 510         return 0;
 511 }
 512
 513
 514 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 515 {
 516         if (r_hash1 == NULL) {
 517                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 518                 return -1;
 519         }
 520
 521         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 522         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 523
 524         return 0;
 525 }
 526
 527
 528 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 529 {
 530         if (r_hash2 == NULL) {
 531                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 532                 return -1;
 533         }
 534
 535         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 536         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 537
 538         return 0;
 539 }
 540
 541
 542 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 543 {
 544         u8 hash[SHA256_MAC_LEN];
 545         const u8 *addr[4];
 546         size_t len[4];
 547
 548         if (r_snonce1 == NULL) {
 549                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 550                 return -1;
 551         }
 552
 553         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 554                         WPS_SECRET_NONCE_LEN);
 555
 556         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 557         addr[0] = r_snonce1;
 558         len[0] = WPS_SECRET_NONCE_LEN;
 559         addr[1] = wps->psk1;
 560         len[1] = WPS_PSK_LEN;
 561         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 562         len[2] = wpabuf_len(wps->dh_pubkey_e);
 563         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 564         len[3] = wpabuf_len(wps->dh_pubkey_r);
 565         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 566
 567         if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 568                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 569                            "not match with the pre-committed value");
 570                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 571                 return -1;
 572         }
 573
 574         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 575                    "half of the device password");
 576
 577         return 0;
 578 }
 579
 580
 581 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 582 {
 583         u8 hash[SHA256_MAC_LEN];
 584         const u8 *addr[4];
 585         size_t len[4];
 586
 587         if (r_snonce2 == NULL) {
 588                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 589                 return -1;
 590         }
 591
 592         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 593                         WPS_SECRET_NONCE_LEN);
 594
 595         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 596         addr[0] = r_snonce2;
 597         len[0] = WPS_SECRET_NONCE_LEN;
 598         addr[1] = wps->psk2;
 599         len[1] = WPS_PSK_LEN;
 600         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 601         len[2] = wpabuf_len(wps->dh_pubkey_e);
 602         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 603         len[3] = wpabuf_len(wps->dh_pubkey_r);
 604         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 605
 606         if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 607                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 608                            "not match with the pre-committed value");
 609                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 610                 return -1;
 611         }
 612
 613         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 614                    "half of the device password");
 615
 616         return 0;
 617 }
 618
 619
 620 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 621                               size_t cred_len)
 622 {
 623         struct wps_parse_attr attr;
 624         struct wpabuf msg;
 625
 626         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 627         os_memset(&wps->cred, 0, sizeof(wps->cred));
 628         wpabuf_set(&msg, cred, cred_len);
 629         if (wps_parse_msg(&msg, &attr) < 0 ||
 630             wps_process_cred(&attr, &wps->cred))
 631                 return -1;
 632
 633         if (wps->wps->cred_cb)
 634                 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 635
 636         return 0;
 637 }
 638
 639
 640 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 641                              size_t cred_len[], size_t num_cred)
 642 {
 643         size_t i;
 644
 645         if (wps->wps->ap)
 646                 return 0;
 647
 648         if (num_cred == 0) {
 649                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 650                            "received");
 651                 return -1;
 652         }
 653
 654         for (i = 0; i < num_cred; i++) {
 655                 if (wps_process_cred_e(wps, cred[i], cred_len[i]))
 656                         return -1;
 657         }
 658
 659         return 0;
 660 }
 661
 662
 663 static int wps_process_ap_settings_e(struct wps_data *wps,
 664                                      struct wps_parse_attr *attr)
 665 {
 666         struct wps_credential cred;
 667
 668         if (!wps->wps->ap)
 669                 return 0;
 670
 671         if (wps_process_ap_settings(attr, &cred) < 0)
 672                 return -1;
 673
 674         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 675                    "Registrar");
 676
 677         if (wps->wps->cred_cb)
 678                 wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 679
 680         return 0;
 681 }
 682
 683
 684 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 685                                            const struct wpabuf *msg,
 686                                            struct wps_parse_attr *attr)
 687 {
 688         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 689
 690         if (wps->state != RECV_M2) {
 691                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 692                            "receiving M2", wps->state);
 693                 wps->state = SEND_WSC_NACK;
 694                 return WPS_CONTINUE;
 695         }
 696
 697         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 698             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 699             wps_process_uuid_r(wps, attr->uuid_r) ||
 700             wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 701             wps_process_authenticator(wps, attr->authenticator, msg)) {
 702                 wps->state = SEND_WSC_NACK;
 703                 return WPS_CONTINUE;
 704         }
 705
 706         if (wps->wps->ap && wps->wps->ap_setup_locked) {
 707                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 708                            "registration of a new Registrar");
 709                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 710                 wps->state = SEND_WSC_NACK;
 711                 return WPS_CONTINUE;
 712         }
 713
 714         wps->state = SEND_M3;
 715         return WPS_CONTINUE;
 716 }
 717
 718
 719 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
 720                                             struct wps_parse_attr *attr)
 721 {
 722         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
 723
 724         if (wps->state != RECV_M2) {
 725                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 726                            "receiving M2D", wps->state);
 727                 wps->state = SEND_WSC_NACK;
 728                 return WPS_CONTINUE;
 729         }
 730
 731         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
 732                           attr->manufacturer, attr->manufacturer_len);
 733         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
 734                           attr->model_name, attr->model_name_len);
 735         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
 736                           attr->model_number, attr->model_number_len);
 737         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
 738                           attr->serial_number, attr->serial_number_len);
 739         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
 740                           attr->dev_name, attr->dev_name_len);
 741
 742         if (wps->wps->event_cb) {
 743                 union wps_event_data data;
 744                 struct wps_event_m2d *m2d = &data.m2d;
 745                 os_memset(&data, 0, sizeof(data));
 746                 if (attr->config_methods)
 747                         m2d->config_methods =
 748                                 WPA_GET_BE16(attr->config_methods);
 749                 m2d->manufacturer = attr->manufacturer;
 750                 m2d->manufacturer_len = attr->manufacturer_len;
 751                 m2d->model_name = attr->model_name;
 752                 m2d->model_name_len = attr->model_name_len;
 753                 m2d->model_number = attr->model_number;
 754                 m2d->model_number_len = attr->model_number_len;
 755                 m2d->serial_number = attr->serial_number;
 756                 m2d->serial_number_len = attr->serial_number_len;
 757                 m2d->dev_name = attr->dev_name;
 758                 m2d->dev_name_len = attr->dev_name_len;
 759                 m2d->primary_dev_type = attr->primary_dev_type;
 760                 if (attr->config_error)
 761                         m2d->config_error =
 762                                 WPA_GET_BE16(attr->config_error);
 763                 if (attr->dev_password_id)
 764                         m2d->dev_password_id =
 765                                 WPA_GET_BE16(attr->dev_password_id);
 766                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
 767         }
 768
 769         wps->state = RECEIVED_M2D;
 770         return WPS_CONTINUE;
 771 }
 772
 773
 774 static enum wps_process_res wps_process_m4(struct wps_data *wps,
 775                                            const struct wpabuf *msg,
 776                                            struct wps_parse_attr *attr)
 777 {
 778         struct wpabuf *decrypted;
 779         struct wps_parse_attr eattr;
 780
 781         wpa_printf(MSG_DEBUG, "WPS: Received M4");
 782
 783         if (wps->state != RECV_M4) {
 784                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 785                            "receiving M4", wps->state);
 786                 wps->state = SEND_WSC_NACK;
 787                 return WPS_CONTINUE;
 788         }
 789
 790         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 791             wps_process_authenticator(wps, attr->authenticator, msg) ||
 792             wps_process_r_hash1(wps, attr->r_hash1) ||
 793             wps_process_r_hash2(wps, attr->r_hash2)) {
 794                 wps->state = SEND_WSC_NACK;
 795                 return WPS_CONTINUE;
 796         }
 797
 798         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 799                                               attr->encr_settings_len);
 800         if (decrypted == NULL) {
 801                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 802                            "Settings attribute");
 803                 wps->state = SEND_WSC_NACK;
 804                 return WPS_CONTINUE;
 805         }
 806
 807         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 808                    "attribute");
 809         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 810             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 811             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
 812                 wpabuf_free(decrypted);
 813                 wps->state = SEND_WSC_NACK;
 814                 return WPS_CONTINUE;
 815         }
 816         wpabuf_free(decrypted);
 817
 818         wps->state = SEND_M5;
 819         return WPS_CONTINUE;
 820 }
 821
 822
 823 static enum wps_process_res wps_process_m6(struct wps_data *wps,
 824                                            const struct wpabuf *msg,
 825                                            struct wps_parse_attr *attr)
 826 {
 827         struct wpabuf *decrypted;
 828         struct wps_parse_attr eattr;
 829
 830         wpa_printf(MSG_DEBUG, "WPS: Received M6");
 831
 832         if (wps->state != RECV_M6) {
 833                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 834                            "receiving M6", wps->state);
 835                 wps->state = SEND_WSC_NACK;
 836                 return WPS_CONTINUE;
 837         }
 838
 839         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 840             wps_process_authenticator(wps, attr->authenticator, msg)) {
 841                 wps->state = SEND_WSC_NACK;
 842                 return WPS_CONTINUE;
 843         }
 844
 845         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 846                                               attr->encr_settings_len);
 847         if (decrypted == NULL) {
 848                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 849                            "Settings attribute");
 850                 wps->state = SEND_WSC_NACK;
 851                 return WPS_CONTINUE;
 852         }
 853
 854         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 855                    "attribute");
 856         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 857             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 858             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
 859                 wpabuf_free(decrypted);
 860                 wps->state = SEND_WSC_NACK;
 861                 return WPS_CONTINUE;
 862         }
 863         wpabuf_free(decrypted);
 864
 865         wps->state = SEND_M7;
 866         return WPS_CONTINUE;
 867 }
 868
 869
 870 static enum wps_process_res wps_process_m8(struct wps_data *wps,
 871                                            const struct wpabuf *msg,
 872                                            struct wps_parse_attr *attr)
 873 {
 874         struct wpabuf *decrypted;
 875         struct wps_parse_attr eattr;
 876
 877         wpa_printf(MSG_DEBUG, "WPS: Received M8");
 878
 879         if (wps->state != RECV_M8) {
 880                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 881                            "receiving M8", wps->state);
 882                 wps->state = SEND_WSC_NACK;
 883                 return WPS_CONTINUE;
 884         }
 885
 886         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 887             wps_process_authenticator(wps, attr->authenticator, msg)) {
 888                 wps->state = SEND_WSC_NACK;
 889                 return WPS_CONTINUE;
 890         }
 891
 892         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 893                                               attr->encr_settings_len);
 894         if (decrypted == NULL) {
 895                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
 896                            "Settings attribute");
 897                 wps->state = SEND_WSC_NACK;
 898                 return WPS_CONTINUE;
 899         }
 900
 901         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
 902                    "attribute");
 903         if (wps_parse_msg(decrypted, &eattr) < 0 ||
 904             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
 905             wps_process_creds(wps, eattr.cred, eattr.cred_len,
 906                               eattr.num_cred) ||
 907             wps_process_ap_settings_e(wps, &eattr)) {
 908                 wpabuf_free(decrypted);
 909                 wps->state = SEND_WSC_NACK;
 910                 return WPS_CONTINUE;
 911         }
 912         wpabuf_free(decrypted);
 913
 914         wps->state = WPS_MSG_DONE;
 915         return WPS_CONTINUE;
 916 }
 917
 918
 919 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
 920                                                 const struct wpabuf *msg)
 921 {
 922         struct wps_parse_attr attr;
 923         enum wps_process_res ret = WPS_CONTINUE;
 924
 925         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
 926
 927         if (wps_parse_msg(msg, &attr) < 0)
 928                 return WPS_FAILURE;
 929
 930         if (attr.version == NULL || *attr.version != WPS_VERSION) {
 931                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 932                            attr.version ? *attr.version : 0);
 933                 return WPS_FAILURE;
 934         }
 935
 936         if (attr.enrollee_nonce == NULL ||
 937             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
 938                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
 939                 return WPS_FAILURE;
 940         }
 941
 942         if (attr.msg_type == NULL) {
 943                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
 944                 return WPS_FAILURE;
 945         }
 946
 947         switch (*attr.msg_type) {
 948         case WPS_M2:
 949                 ret = wps_process_m2(wps, msg, &attr);
 950                 break;
 951         case WPS_M2D:
 952                 ret = wps_process_m2d(wps, &attr);
 953                 break;
 954         case WPS_M4:
 955                 ret = wps_process_m4(wps, msg, &attr);
 956                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 957                         wps_fail_event(wps->wps, WPS_M4);
 958                 break;
 959         case WPS_M6:
 960                 ret = wps_process_m6(wps, msg, &attr);
 961                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 962                         wps_fail_event(wps->wps, WPS_M6);
 963                 break;
 964         case WPS_M8:
 965                 ret = wps_process_m8(wps, msg, &attr);
 966                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
 967                         wps_fail_event(wps->wps, WPS_M8);
 968                 break;
 969         default:
 970                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
 971                            *attr.msg_type);
 972                 return WPS_FAILURE;
 973         }
 974
 975         if (ret == WPS_CONTINUE) {
 976                 /* Save a copy of the last message for Authenticator derivation
 977                  */
 978                 wpabuf_free(wps->last_msg);
 979                 wps->last_msg = wpabuf_dup(msg);
 980         }
 981
 982         return ret;
 983 }
 984
 985
 986 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
 987                                                 const struct wpabuf *msg)
 988 {
 989         struct wps_parse_attr attr;
 990
 991         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
 992
 993         if (wps_parse_msg(msg, &attr) < 0)
 994                 return WPS_FAILURE;
 995
 996         if (attr.version == NULL || *attr.version != WPS_VERSION) {
 997                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
 998                            attr.version ? *attr.version : 0);
 999                 return WPS_FAILURE;
1000         }
1001
1002         if (attr.msg_type == NULL) {
1003                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1004                 return WPS_FAILURE;
1005         }
1006
1007         if (*attr.msg_type != WPS_WSC_ACK) {
1008                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1009                            *attr.msg_type);
1010                 return WPS_FAILURE;
1011         }
1012
1013         if (attr.registrar_nonce == NULL ||
1014             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1015         {
1016                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1017                 return WPS_FAILURE;
1018         }
1019
1020         if (attr.enrollee_nonce == NULL ||
1021             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1022                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1023                 return WPS_FAILURE;
1024         }
1025
1026         if (wps->state == RECV_ACK && wps->wps->ap) {
1027                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1028                            "completed successfully");
1029                 wps_success_event(wps->wps);
1030                 wps->state = WPS_FINISHED;
1031                 return WPS_DONE;
1032         }
1033
1034         return WPS_FAILURE;
1035 }
1036
1037
1038 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1039                                                  const struct wpabuf *msg)
1040 {
1041         struct wps_parse_attr attr;
1042
1043         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1044
1045         if (wps_parse_msg(msg, &attr) < 0)
1046                 return WPS_FAILURE;
1047
1048         if (attr.version == NULL || *attr.version != WPS_VERSION) {
1049                 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x",
1050                            attr.version ? *attr.version : 0);
1051                 return WPS_FAILURE;
1052         }
1053
1054         if (attr.msg_type == NULL) {
1055                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1056                 return WPS_FAILURE;
1057         }
1058
1059         if (*attr.msg_type != WPS_WSC_NACK) {
1060                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1061                            *attr.msg_type);
1062                 return WPS_FAILURE;
1063         }
1064
1065         if (attr.registrar_nonce == NULL ||
1066             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
1067         {
1068                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1069                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1070                             attr.registrar_nonce, WPS_NONCE_LEN);
1071                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1072                             wps->nonce_r, WPS_NONCE_LEN);
1073                 return WPS_FAILURE;
1074         }
1075
1076         if (attr.enrollee_nonce == NULL ||
1077             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
1078                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1079                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1080                             attr.enrollee_nonce, WPS_NONCE_LEN);
1081                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1082                             wps->nonce_e, WPS_NONCE_LEN);
1083                 return WPS_FAILURE;
1084         }
1085
1086         if (attr.config_error == NULL) {
1087                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1088                            "in WSC_NACK");
1089                 return WPS_FAILURE;
1090         }
1091
1092         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1093                    "Configuration Error %d", WPA_GET_BE16(attr.config_error));
1094
1095         switch (wps->state) {
1096         case RECV_M4:
1097                 wps_fail_event(wps->wps, WPS_M3);
1098                 break;
1099         case RECV_M6:
1100                 wps_fail_event(wps->wps, WPS_M5);
1101                 break;
1102         case RECV_M8:
1103                 wps_fail_event(wps->wps, WPS_M7);
1104                 break;
1105         default:
1106                 break;
1107         }
1108
1109         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1110          * Enrollee is Authenticator */
1111         wps->state = SEND_WSC_NACK;
1112
1113         return WPS_FAILURE;
1114 }
1115
1116
1117 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1118                                               enum wsc_op_code op_code,
1119                                               const struct wpabuf *msg)
1120 {
1121
1122         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1123                    "op_code=%d)",
1124                    (unsigned long) wpabuf_len(msg), op_code);
1125
1126         switch (op_code) {
1127         case WSC_MSG:
1128                 return wps_process_wsc_msg(wps, msg);
1129         case WSC_ACK:
1130                 return wps_process_wsc_ack(wps, msg);
1131         case WSC_NACK:
1132                 return wps_process_wsc_nack(wps, msg);
1133         default:
1134                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1135                 return WPS_FAILURE;
1136         }
1137 }