libeap/src/wps/wps_enrollee.c

   1 /*
   2  * Wi-Fi Protected Setup - Enrollee
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/crypto.h"
  13 #include "crypto/sha256.h"
  14 #include "crypto/random.h"
  15 #include "wps_i.h"
  16 #include "wps_dev_attr.h"
  17
  18
  19 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
  20 {
  21         u8 state;
  22         if (wps->wps->ap)
  23                 state = wps->wps->wps_state;
  24         else
  25                 state = WPS_STATE_NOT_CONFIGURED;
  26         wpa_printf(MSG_DEBUG, "WPS:  * Wi-Fi Protected Setup State (%d)",
  27                    state);
  28         wpabuf_put_be16(msg, ATTR_WPS_STATE);
  29         wpabuf_put_be16(msg, 1);
  30         wpabuf_put_u8(msg, state);
  31         return 0;
  32 }
  33
  34
  35 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg)
  36 {
  37         u8 *hash;
  38         const u8 *addr[4];
  39         size_t len[4];
  40
  41         if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
  42                 return -1;
  43         wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
  44         wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
  45                     wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
  46
  47         if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
  48                 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
  49                            "E-Hash derivation");
  50                 return -1;
  51         }
  52
  53         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash1");
  54         wpabuf_put_be16(msg, ATTR_E_HASH1);
  55         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  56         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  57         /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
  58         addr[0] = wps->snonce;
  59         len[0] = WPS_SECRET_NONCE_LEN;
  60         addr[1] = wps->psk1;
  61         len[1] = WPS_PSK_LEN;
  62         addr[2] = wpabuf_head(wps->dh_pubkey_e);
  63         len[2] = wpabuf_len(wps->dh_pubkey_e);
  64         addr[3] = wpabuf_head(wps->dh_pubkey_r);
  65         len[3] = wpabuf_len(wps->dh_pubkey_r);
  66         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  67         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
  68
  69         wpa_printf(MSG_DEBUG, "WPS:  * E-Hash2");
  70         wpabuf_put_be16(msg, ATTR_E_HASH2);
  71         wpabuf_put_be16(msg, SHA256_MAC_LEN);
  72         hash = wpabuf_put(msg, SHA256_MAC_LEN);
  73         /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
  74         addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
  75         addr[1] = wps->psk2;
  76         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
  77         wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
  78
  79         return 0;
  80 }
  81
  82
  83 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
  84 {
  85         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce1");
  86         wpabuf_put_be16(msg, ATTR_E_SNONCE1);
  87         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
  88         wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
  89         return 0;
  90 }
  91
  92
  93 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
  94 {
  95         wpa_printf(MSG_DEBUG, "WPS:  * E-SNonce2");
  96         wpabuf_put_be16(msg, ATTR_E_SNONCE2);
  97         wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
  98         wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
  99                         WPS_SECRET_NONCE_LEN);
 100         return 0;
 101 }
 102
 103
 104 static struct wpabuf * wps_build_m1(struct wps_data *wps)
 105 {
 106         struct wpabuf *msg;
 107         u16 config_methods;
 108
 109         if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0)
 110                 return NULL;
 111         wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
 112                     wps->nonce_e, WPS_NONCE_LEN);
 113
 114         wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
 115         msg = wpabuf_alloc(1000);
 116         if (msg == NULL)
 117                 return NULL;
 118
 119         config_methods = wps->wps->config_methods;
 120         if (wps->wps->ap && !wps->pbc_in_m1 &&
 121             (wps->dev_password_len != 0 ||
 122              (config_methods & WPS_CONFIG_DISPLAY))) {
 123                 /*
 124                  * These are the methods that the AP supports as an Enrollee
 125                  * for adding external Registrars, so remove PushButton.
 126                  *
 127                  * As a workaround for Windows 7 mechanism for probing WPS
 128                  * capabilities from M1, leave PushButton option if no PIN
 129                  * method is available or if WPS configuration enables PBC
 130                  * workaround.
 131                  */
 132                 config_methods &= ~WPS_CONFIG_PUSHBUTTON;
 133                 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
 134                                     WPS_CONFIG_PHY_PUSHBUTTON);
 135         }
 136
 137         if (wps_build_version(msg) ||
 138             wps_build_msg_type(msg, WPS_M1) ||
 139             wps_build_uuid_e(msg, wps->uuid_e) ||
 140             wps_build_mac_addr(msg, wps->mac_addr_e) ||
 141             wps_build_enrollee_nonce(wps, msg) ||
 142             wps_build_public_key(wps, msg) ||
 143             wps_build_auth_type_flags(wps, msg) ||
 144             wps_build_encr_type_flags(wps, msg) ||
 145             wps_build_conn_type_flags(wps, msg) ||
 146             wps_build_config_methods(msg, config_methods) ||
 147             wps_build_wps_state(wps, msg) ||
 148             wps_build_device_attrs(&wps->wps->dev, msg) ||
 149             wps_build_rf_bands(&wps->wps->dev, msg,
 150                                wps->wps->rf_band_cb(wps->wps->cb_ctx)) ||
 151             wps_build_assoc_state(wps, msg) ||
 152             wps_build_dev_password_id(msg, wps->dev_pw_id) ||
 153             wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
 154             wps_build_os_version(&wps->wps->dev, msg) ||
 155             wps_build_wfa_ext(msg, 0, NULL, 0) ||
 156             wps_build_vendor_ext_m1(&wps->wps->dev, msg)) {
 157                 wpabuf_free(msg);
 158                 return NULL;
 159         }
 160
 161         wps->state = RECV_M2;
 162         return msg;
 163 }
 164
 165
 166 static struct wpabuf * wps_build_m3(struct wps_data *wps)
 167 {
 168         struct wpabuf *msg;
 169
 170         wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
 171
 172         if (wps->dev_password == NULL) {
 173                 wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
 174                 return NULL;
 175         }
 176         wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
 177
 178         if (wps->wps->ap && random_pool_ready() != 1) {
 179                 wpa_printf(MSG_INFO,
 180                            "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used");
 181                 return NULL;
 182         }
 183
 184         msg = wpabuf_alloc(1000);
 185         if (msg == NULL)
 186                 return NULL;
 187
 188         if (wps_build_version(msg) ||
 189             wps_build_msg_type(msg, WPS_M3) ||
 190             wps_build_registrar_nonce(wps, msg) ||
 191             wps_build_e_hash(wps, msg) ||
 192             wps_build_wfa_ext(msg, 0, NULL, 0) ||
 193             wps_build_authenticator(wps, msg)) {
 194                 wpabuf_free(msg);
 195                 return NULL;
 196         }
 197
 198         wps->state = RECV_M4;
 199         return msg;
 200 }
 201
 202
 203 static struct wpabuf * wps_build_m5(struct wps_data *wps)
 204 {
 205         struct wpabuf *msg, *plain;
 206
 207         wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
 208
 209         plain = wpabuf_alloc(200);
 210         if (plain == NULL)
 211                 return NULL;
 212
 213         msg = wpabuf_alloc(1000);
 214         if (msg == NULL) {
 215                 wpabuf_free(plain);
 216                 return NULL;
 217         }
 218
 219         if (wps_build_version(msg) ||
 220             wps_build_msg_type(msg, WPS_M5) ||
 221             wps_build_registrar_nonce(wps, msg) ||
 222             wps_build_e_snonce1(wps, plain) ||
 223             wps_build_key_wrap_auth(wps, plain) ||
 224             wps_build_encr_settings(wps, msg, plain) ||
 225             wps_build_wfa_ext(msg, 0, NULL, 0) ||
 226             wps_build_authenticator(wps, msg)) {
 227                 wpabuf_free(plain);
 228                 wpabuf_free(msg);
 229                 return NULL;
 230         }
 231         wpabuf_free(plain);
 232
 233         wps->state = RECV_M6;
 234         return msg;
 235 }
 236
 237
 238 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 239 {
 240         wpa_printf(MSG_DEBUG, "WPS:  * SSID");
 241         wpabuf_put_be16(msg, ATTR_SSID);
 242         wpabuf_put_be16(msg, wps->wps->ssid_len);
 243         wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
 244         return 0;
 245 }
 246
 247
 248 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 249 {
 250         u16 auth_type = wps->wps->ap_auth_type;
 251
 252         /*
 253          * Work around issues with Windows 7 WPS implementation not liking
 254          * multiple Authentication Type bits in M7 AP Settings attribute by
 255          * showing only the most secure option from current configuration.
 256          */
 257         if (auth_type & WPS_AUTH_WPA2PSK)
 258                 auth_type = WPS_AUTH_WPA2PSK;
 259         else if (auth_type & WPS_AUTH_WPAPSK)
 260                 auth_type = WPS_AUTH_WPAPSK;
 261         else if (auth_type & WPS_AUTH_OPEN)
 262                 auth_type = WPS_AUTH_OPEN;
 263
 264         wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)", auth_type);
 265         wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 266         wpabuf_put_be16(msg, 2);
 267         wpabuf_put_be16(msg, auth_type);
 268         return 0;
 269 }
 270
 271
 272 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 273 {
 274         u16 encr_type = wps->wps->ap_encr_type;
 275
 276         /*
 277          * Work around issues with Windows 7 WPS implementation not liking
 278          * multiple Encryption Type bits in M7 AP Settings attribute by
 279          * showing only the most secure option from current configuration.
 280          */
 281         if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) {
 282                 if (encr_type & WPS_ENCR_AES)
 283                         encr_type = WPS_ENCR_AES;
 284                 else if (encr_type & WPS_ENCR_TKIP)
 285                         encr_type = WPS_ENCR_TKIP;
 286         }
 287
 288         wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)", encr_type);
 289         wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 290         wpabuf_put_be16(msg, 2);
 291         wpabuf_put_be16(msg, encr_type);
 292         return 0;
 293 }
 294
 295
 296 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
 297 {
 298         if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) &&
 299             wps->wps->network_key_len == 0) {
 300                 char hex[65];
 301                 u8 psk[32];
 302                 /* Generate a random per-device PSK */
 303                 if (random_pool_ready() != 1 ||
 304                     random_get_bytes(psk, sizeof(psk)) < 0) {
 305                         wpa_printf(MSG_INFO,
 306                                    "WPS: Could not generate random PSK");
 307                         return -1;
 308                 }
 309                 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK",
 310                                 psk, sizeof(psk));
 311                 wpa_printf(MSG_DEBUG, "WPS:  * Network Key (len=%u)",
 312                            (unsigned int) wps->new_psk_len * 2);
 313                 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk));
 314                 wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 315                 wpabuf_put_be16(msg, sizeof(psk) * 2);
 316                 wpabuf_put_data(msg, hex, sizeof(psk) * 2);
 317                 if (wps->wps->registrar) {
 318                         wps_cb_new_psk(wps->wps->registrar,
 319                                        wps->peer_dev.mac_addr,
 320                                        wps->p2p_dev_addr, psk, sizeof(psk));
 321                 }
 322                 return 0;
 323         }
 324
 325         wpa_printf(MSG_DEBUG, "WPS:  * Network Key (len=%u)",
 326                    (unsigned int) wps->wps->network_key_len);
 327         wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
 328         wpabuf_put_be16(msg, wps->wps->network_key_len);
 329         wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
 330         return 0;
 331 }
 332
 333
 334 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
 335 {
 336         wpa_printf(MSG_DEBUG, "WPS:  * MAC Address (AP BSSID)");
 337         wpabuf_put_be16(msg, ATTR_MAC_ADDR);
 338         wpabuf_put_be16(msg, ETH_ALEN);
 339         wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
 340         return 0;
 341 }
 342
 343
 344 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
 345 {
 346         const u8 *start, *end;
 347         int ret;
 348
 349         if (wps->wps->ap_settings) {
 350                 wpa_printf(MSG_DEBUG, "WPS:  * AP Settings (pre-configured)");
 351                 wpabuf_put_data(plain, wps->wps->ap_settings,
 352                                 wps->wps->ap_settings_len);
 353                 return 0;
 354         }
 355
 356         wpa_printf(MSG_DEBUG, "WPS:  * AP Settings based on current configuration");
 357         start = wpabuf_put(plain, 0);
 358         ret = wps_build_cred_ssid(wps, plain) ||
 359                 wps_build_cred_mac_addr(wps, plain) ||
 360                 wps_build_cred_auth_type(wps, plain) ||
 361                 wps_build_cred_encr_type(wps, plain) ||
 362                 wps_build_cred_network_key(wps, plain);
 363         end = wpabuf_put(plain, 0);
 364
 365         wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings",
 366                         start, end - start);
 367
 368         return ret;
 369 }
 370
 371
 372 static struct wpabuf * wps_build_m7(struct wps_data *wps)
 373 {
 374         struct wpabuf *msg, *plain;
 375
 376         wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
 377
 378         plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
 379         if (plain == NULL)
 380                 return NULL;
 381
 382         msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
 383         if (msg == NULL) {
 384                 wpabuf_free(plain);
 385                 return NULL;
 386         }
 387
 388         if (wps_build_version(msg) ||
 389             wps_build_msg_type(msg, WPS_M7) ||
 390             wps_build_registrar_nonce(wps, msg) ||
 391             wps_build_e_snonce2(wps, plain) ||
 392             (wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
 393             wps_build_key_wrap_auth(wps, plain) ||
 394             wps_build_encr_settings(wps, msg, plain) ||
 395             wps_build_wfa_ext(msg, 0, NULL, 0) ||
 396             wps_build_authenticator(wps, msg)) {
 397                 wpabuf_free(plain);
 398                 wpabuf_free(msg);
 399                 return NULL;
 400         }
 401         wpabuf_free(plain);
 402
 403         if (wps->wps->ap && wps->wps->registrar) {
 404                 /*
 405                  * If the Registrar is only learning our current configuration,
 406                  * it may not continue protocol run to successful completion.
 407                  * Store information here to make sure it remains available.
 408                  */
 409                 wps_device_store(wps->wps->registrar, &wps->peer_dev,
 410                                  wps->uuid_r);
 411         }
 412
 413         wps->state = RECV_M8;
 414         return msg;
 415 }
 416
 417
 418 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
 419 {
 420         struct wpabuf *msg;
 421
 422         wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
 423
 424         msg = wpabuf_alloc(1000);
 425         if (msg == NULL)
 426                 return NULL;
 427
 428         if (wps_build_version(msg) ||
 429             wps_build_msg_type(msg, WPS_WSC_DONE) ||
 430             wps_build_enrollee_nonce(wps, msg) ||
 431             wps_build_registrar_nonce(wps, msg) ||
 432             wps_build_wfa_ext(msg, 0, NULL, 0)) {
 433                 wpabuf_free(msg);
 434                 return NULL;
 435         }
 436
 437         if (wps->wps->ap)
 438                 wps->state = RECV_ACK;
 439         else {
 440                 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
 441                 wps->state = WPS_FINISHED;
 442         }
 443         return msg;
 444 }
 445
 446
 447 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
 448                                      enum wsc_op_code *op_code)
 449 {
 450         struct wpabuf *msg;
 451
 452         switch (wps->state) {
 453         case SEND_M1:
 454                 msg = wps_build_m1(wps);
 455                 *op_code = WSC_MSG;
 456                 break;
 457         case SEND_M3:
 458                 msg = wps_build_m3(wps);
 459                 *op_code = WSC_MSG;
 460                 break;
 461         case SEND_M5:
 462                 msg = wps_build_m5(wps);
 463                 *op_code = WSC_MSG;
 464                 break;
 465         case SEND_M7:
 466                 msg = wps_build_m7(wps);
 467                 *op_code = WSC_MSG;
 468                 break;
 469         case RECEIVED_M2D:
 470                 if (wps->wps->ap) {
 471                         msg = wps_build_wsc_nack(wps);
 472                         *op_code = WSC_NACK;
 473                         break;
 474                 }
 475                 msg = wps_build_wsc_ack(wps);
 476                 *op_code = WSC_ACK;
 477                 if (msg) {
 478                         /* Another M2/M2D may be received */
 479                         wps->state = RECV_M2;
 480                 }
 481                 break;
 482         case SEND_WSC_NACK:
 483                 msg = wps_build_wsc_nack(wps);
 484                 *op_code = WSC_NACK;
 485                 break;
 486         case WPS_MSG_DONE:
 487                 msg = wps_build_wsc_done(wps);
 488                 *op_code = WSC_Done;
 489                 break;
 490         default:
 491                 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
 492                            "a message", wps->state);
 493                 msg = NULL;
 494                 break;
 495         }
 496
 497         if (*op_code == WSC_MSG && msg) {
 498                 /* Save a copy of the last message for Authenticator derivation
 499                  */
 500                 wpabuf_free(wps->last_msg);
 501                 wps->last_msg = wpabuf_dup(msg);
 502         }
 503
 504         return msg;
 505 }
 506
 507
 508 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
 509 {
 510         if (r_nonce == NULL) {
 511                 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
 512                 return -1;
 513         }
 514
 515         os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
 516         wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
 517                     wps->nonce_r, WPS_NONCE_LEN);
 518
 519         return 0;
 520 }
 521
 522
 523 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
 524 {
 525         if (e_nonce == NULL) {
 526                 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
 527                 return -1;
 528         }
 529
 530         if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
 531                 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
 532                 return -1;
 533         }
 534
 535         return 0;
 536 }
 537
 538
 539 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
 540 {
 541         if (uuid_r == NULL) {
 542                 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
 543                 return -1;
 544         }
 545
 546         os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
 547         wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
 548
 549         return 0;
 550 }
 551
 552
 553 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
 554                               size_t pk_len)
 555 {
 556         if (pk == NULL || pk_len == 0) {
 557                 wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
 558                 return -1;
 559         }
 560
 561         if (wps->peer_pubkey_hash_set) {
 562                 u8 hash[WPS_HASH_LEN];
 563                 sha256_vector(1, &pk, &pk_len, hash);
 564                 if (os_memcmp_const(hash, wps->peer_pubkey_hash,
 565                                     WPS_OOB_PUBKEY_HASH_LEN) != 0) {
 566                         wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch");
 567                         wpa_hexdump(MSG_DEBUG, "WPS: Received public key",
 568                                     pk, pk_len);
 569                         wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key "
 570                                     "hash", hash, WPS_OOB_PUBKEY_HASH_LEN);
 571                         wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash",
 572                                     wps->peer_pubkey_hash,
 573                                     WPS_OOB_PUBKEY_HASH_LEN);
 574                         wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH;
 575                         return -1;
 576                 }
 577         }
 578
 579         wpabuf_free(wps->dh_pubkey_r);
 580         wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
 581         if (wps->dh_pubkey_r == NULL)
 582                 return -1;
 583
 584         if (wps_derive_keys(wps) < 0)
 585                 return -1;
 586
 587         return 0;
 588 }
 589
 590
 591 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
 592 {
 593         if (r_hash1 == NULL) {
 594                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
 595                 return -1;
 596         }
 597
 598         os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
 599         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
 600
 601         return 0;
 602 }
 603
 604
 605 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
 606 {
 607         if (r_hash2 == NULL) {
 608                 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
 609                 return -1;
 610         }
 611
 612         os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
 613         wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
 614
 615         return 0;
 616 }
 617
 618
 619 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
 620 {
 621         u8 hash[SHA256_MAC_LEN];
 622         const u8 *addr[4];
 623         size_t len[4];
 624
 625         if (r_snonce1 == NULL) {
 626                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
 627                 return -1;
 628         }
 629
 630         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
 631                         WPS_SECRET_NONCE_LEN);
 632
 633         /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
 634         addr[0] = r_snonce1;
 635         len[0] = WPS_SECRET_NONCE_LEN;
 636         addr[1] = wps->psk1;
 637         len[1] = WPS_PSK_LEN;
 638         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 639         len[2] = wpabuf_len(wps->dh_pubkey_e);
 640         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 641         len[3] = wpabuf_len(wps->dh_pubkey_r);
 642         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 643
 644         if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
 645                 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
 646                            "not match with the pre-committed value");
 647                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 648                 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr);
 649                 return -1;
 650         }
 651
 652         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
 653                    "half of the device password");
 654
 655         return 0;
 656 }
 657
 658
 659 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
 660 {
 661         u8 hash[SHA256_MAC_LEN];
 662         const u8 *addr[4];
 663         size_t len[4];
 664
 665         if (r_snonce2 == NULL) {
 666                 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
 667                 return -1;
 668         }
 669
 670         wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
 671                         WPS_SECRET_NONCE_LEN);
 672
 673         /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
 674         addr[0] = r_snonce2;
 675         len[0] = WPS_SECRET_NONCE_LEN;
 676         addr[1] = wps->psk2;
 677         len[1] = WPS_PSK_LEN;
 678         addr[2] = wpabuf_head(wps->dh_pubkey_e);
 679         len[2] = wpabuf_len(wps->dh_pubkey_e);
 680         addr[3] = wpabuf_head(wps->dh_pubkey_r);
 681         len[3] = wpabuf_len(wps->dh_pubkey_r);
 682         hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
 683
 684         if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
 685                 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
 686                            "not match with the pre-committed value");
 687                 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
 688                 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr);
 689                 return -1;
 690         }
 691
 692         wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
 693                    "half of the device password");
 694
 695         return 0;
 696 }
 697
 698
 699 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
 700                               size_t cred_len, int wps2)
 701 {
 702         struct wps_parse_attr attr;
 703         struct wpabuf msg;
 704         int ret = 0;
 705
 706         wpa_printf(MSG_DEBUG, "WPS: Received Credential");
 707         os_memset(&wps->cred, 0, sizeof(wps->cred));
 708         wpabuf_set(&msg, cred, cred_len);
 709         if (wps_parse_msg(&msg, &attr) < 0 ||
 710             wps_process_cred(&attr, &wps->cred))
 711                 return -1;
 712
 713         if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 714             0) {
 715                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
 716                            MACSTR ") does not match with own address (" MACSTR
 717                            ")", MAC2STR(wps->cred.mac_addr),
 718                            MAC2STR(wps->wps->dev.mac_addr));
 719                 /*
 720                  * In theory, this could be consider fatal error, but there are
 721                  * number of deployed implementations using other address here
 722                  * due to unclarity in the specification. For interoperability
 723                  * reasons, allow this to be processed since we do not really
 724                  * use the MAC Address information for anything.
 725                  */
 726 #ifdef CONFIG_WPS_STRICT
 727                 if (wps2) {
 728                         wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
 729                                    "MAC Address in AP Settings");
 730                         return -1;
 731                 }
 732 #endif /* CONFIG_WPS_STRICT */
 733         }
 734
 735         if (!(wps->cred.encr_type &
 736               (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
 737                 if (wps->cred.encr_type & WPS_ENCR_WEP) {
 738                         wpa_printf(MSG_INFO, "WPS: Reject Credential "
 739                                    "due to WEP configuration");
 740                         wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
 741                         return -2;
 742                 }
 743
 744                 wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
 745                            "invalid encr_type 0x%x", wps->cred.encr_type);
 746                 return -1;
 747         }
 748
 749         if (wps->wps->cred_cb) {
 750                 wps->cred.cred_attr = cred - 4;
 751                 wps->cred.cred_attr_len = cred_len + 4;
 752                 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
 753                 wps->cred.cred_attr = NULL;
 754                 wps->cred.cred_attr_len = 0;
 755         }
 756
 757         return ret;
 758 }
 759
 760
 761 static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
 762                              u16 cred_len[], unsigned int num_cred, int wps2)
 763 {
 764         size_t i;
 765         int ok = 0;
 766
 767         if (wps->wps->ap)
 768                 return 0;
 769
 770         if (num_cred == 0) {
 771                 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
 772                            "received");
 773                 return -1;
 774         }
 775
 776         for (i = 0; i < num_cred; i++) {
 777                 int res;
 778                 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
 779                 if (res == 0)
 780                         ok++;
 781                 else if (res == -2)
 782                         wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
 783                 else
 784                         return -1;
 785         }
 786
 787         if (ok == 0) {
 788                 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
 789                            "received");
 790                 return -1;
 791         }
 792
 793         return 0;
 794 }
 795
 796
 797 static int wps_process_ap_settings_e(struct wps_data *wps,
 798                                      struct wps_parse_attr *attr,
 799                                      struct wpabuf *attrs, int wps2)
 800 {
 801         struct wps_credential cred;
 802         int ret = 0;
 803
 804         if (!wps->wps->ap)
 805                 return 0;
 806
 807         if (wps_process_ap_settings(attr, &cred) < 0)
 808                 return -1;
 809
 810         wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
 811                    "Registrar");
 812
 813         if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
 814             0) {
 815                 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
 816                            MACSTR ") does not match with own address (" MACSTR
 817                            ")", MAC2STR(cred.mac_addr),
 818                            MAC2STR(wps->wps->dev.mac_addr));
 819                 /*
 820                  * In theory, this could be consider fatal error, but there are
 821                  * number of deployed implementations using other address here
 822                  * due to unclarity in the specification. For interoperability
 823                  * reasons, allow this to be processed since we do not really
 824                  * use the MAC Address information for anything.
 825                  */
 826 #ifdef CONFIG_WPS_STRICT
 827                 if (wps2) {
 828                         wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
 829                                    "MAC Address in AP Settings");
 830                         return -1;
 831                 }
 832 #endif /* CONFIG_WPS_STRICT */
 833         }
 834
 835         if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
 836         {
 837                 if (cred.encr_type & WPS_ENCR_WEP) {
 838                         wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
 839                                    "due to WEP configuration");
 840                         wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
 841                         return -1;
 842                 }
 843
 844                 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
 845                            "invalid encr_type 0x%x", cred.encr_type);
 846                 return -1;
 847         }
 848
 849 #ifdef CONFIG_WPS_STRICT
 850         if (wps2) {
 851                 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
 852                     WPS_ENCR_TKIP ||
 853                     (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 854                     WPS_AUTH_WPAPSK) {
 855                         wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
 856                                    "AP Settings: WPA-Personal/TKIP only");
 857                         wps->error_indication =
 858                                 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED;
 859                         return -1;
 860                 }
 861         }
 862 #endif /* CONFIG_WPS_STRICT */
 863
 864         if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
 865         {
 866                 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
 867                            "TKIP+AES");
 868                 cred.encr_type |= WPS_ENCR_AES;
 869         }
 870
 871         if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
 872             WPS_AUTH_WPAPSK) {
 873                 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
 874                            "WPAPSK+WPA2PSK");
 875                 cred.auth_type |= WPS_AUTH_WPA2PSK;
 876         }
 877
 878         if (wps->wps->cred_cb) {
 879                 cred.cred_attr = wpabuf_head(attrs);
 880                 cred.cred_attr_len = wpabuf_len(attrs);
 881                 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
 882         }
 883
 884         return ret;
 885 }
 886
 887
 888 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id)
 889 {
 890         u16 id;
 891
 892         if (dev_pw_id == NULL) {
 893                 wpa_printf(MSG_DEBUG, "WPS: Device Password ID");
 894                 return -1;
 895         }
 896
 897         id = WPA_GET_BE16(dev_pw_id);
 898         if (wps->dev_pw_id == id) {
 899                 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id);
 900                 return 0;
 901         }
 902
 903 #ifdef CONFIG_P2P
 904         if ((id == DEV_PW_DEFAULT &&
 905              wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) ||
 906             (id == DEV_PW_REGISTRAR_SPECIFIED &&
 907              wps->dev_pw_id == DEV_PW_DEFAULT)) {
 908                 /*
 909                  * Common P2P use cases indicate whether the PIN is from the
 910                  * client or GO using Device Password Id in M1/M2 in a way that
 911                  * does not look fully compliant with WSC specification. Anyway,
 912                  * this is deployed and needs to be allowed, so ignore changes
 913                  * between Registrar-Specified and Default PIN.
 914                  */
 915                 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID "
 916                            "change");
 917                 return 0;
 918         }
 919 #endif /* CONFIG_P2P */
 920
 921         wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password "
 922                    "ID from %u to %u", wps->dev_pw_id, id);
 923
 924         if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) {
 925                 wpa_printf(MSG_DEBUG,
 926                            "WPS: Workaround - ignore PBC-to-PIN change");
 927                 return 0;
 928         }
 929
 930         if (wps->alt_dev_password && wps->alt_dev_pw_id == id) {
 931                 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password");
 932                 bin_clear_free(wps->dev_password, wps->dev_password_len);
 933                 wps->dev_pw_id = wps->alt_dev_pw_id;
 934                 wps->dev_password = wps->alt_dev_password;
 935                 wps->dev_password_len = wps->alt_dev_password_len;
 936                 wps->alt_dev_password = NULL;
 937                 wps->alt_dev_password_len = 0;
 938                 return 0;
 939         }
 940
 941         return -1;
 942 }
 943
 944
 945 static enum wps_process_res wps_process_m2(struct wps_data *wps,
 946                                            const struct wpabuf *msg,
 947                                            struct wps_parse_attr *attr)
 948 {
 949         wpa_printf(MSG_DEBUG, "WPS: Received M2");
 950
 951         if (wps->state != RECV_M2) {
 952                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
 953                            "receiving M2", wps->state);
 954                 wps->state = SEND_WSC_NACK;
 955                 return WPS_CONTINUE;
 956         }
 957
 958         if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
 959             wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
 960             wps_process_uuid_r(wps, attr->uuid_r) ||
 961             wps_process_dev_pw_id(wps, attr->dev_password_id)) {
 962                 wps->state = SEND_WSC_NACK;
 963                 return WPS_CONTINUE;
 964         }
 965
 966         /*
 967          * Stop here on an AP as an Enrollee if AP Setup is locked unless the
 968          * special locked mode is used to allow protocol run up to M7 in order
 969          * to support external Registrars that only learn the current AP
 970          * configuration without changing it.
 971          */
 972         if (wps->wps->ap &&
 973             ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) ||
 974              wps->dev_password == NULL)) {
 975                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
 976                            "registration of a new Registrar");
 977                 wps->config_error = WPS_CFG_SETUP_LOCKED;
 978                 wps->state = SEND_WSC_NACK;
 979                 return WPS_CONTINUE;
 980         }
 981
 982         if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
 983             wps_process_authenticator(wps, attr->authenticator, msg) ||
 984             wps_process_device_attrs(&wps->peer_dev, attr)) {
 985                 wps->state = SEND_WSC_NACK;
 986                 return WPS_CONTINUE;
 987         }
 988
 989 #ifdef CONFIG_WPS_NFC
 990         if (wps->peer_pubkey_hash_set) {
 991                 struct wpabuf *decrypted;
 992                 struct wps_parse_attr eattr;
 993
 994                 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
 995                                                       attr->encr_settings_len);
 996                 if (decrypted == NULL) {
 997                         wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt "
 998                                    "Encrypted Settings attribute");
 999                         wps->state = SEND_WSC_NACK;
1000                         return WPS_CONTINUE;
1001                 }
1002
1003                 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted "
1004                            "Settings attribute");
1005                 if (wps_parse_msg(decrypted, &eattr) < 0 ||
1006                     wps_process_key_wrap_auth(wps, decrypted,
1007                                               eattr.key_wrap_auth) ||
1008                     wps_process_creds(wps, eattr.cred, eattr.cred_len,
1009                                       eattr.num_cred, attr->version2 != NULL)) {
1010                         wpabuf_free(decrypted);
1011                         wps->state = SEND_WSC_NACK;
1012                         return WPS_CONTINUE;
1013                 }
1014                 wpabuf_free(decrypted);
1015
1016                 wps->state = WPS_MSG_DONE;
1017                 return WPS_CONTINUE;
1018         }
1019 #endif /* CONFIG_WPS_NFC */
1020
1021         wps->state = SEND_M3;
1022         return WPS_CONTINUE;
1023 }
1024
1025
1026 static enum wps_process_res wps_process_m2d(struct wps_data *wps,
1027                                             struct wps_parse_attr *attr)
1028 {
1029         wpa_printf(MSG_DEBUG, "WPS: Received M2D");
1030
1031         if (wps->state != RECV_M2) {
1032                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1033                            "receiving M2D", wps->state);
1034                 wps->state = SEND_WSC_NACK;
1035                 return WPS_CONTINUE;
1036         }
1037
1038         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
1039                           attr->manufacturer, attr->manufacturer_len);
1040         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
1041                           attr->model_name, attr->model_name_len);
1042         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
1043                           attr->model_number, attr->model_number_len);
1044         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
1045                           attr->serial_number, attr->serial_number_len);
1046         wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
1047                           attr->dev_name, attr->dev_name_len);
1048
1049         if (wps->wps->event_cb) {
1050                 union wps_event_data data;
1051                 struct wps_event_m2d *m2d = &data.m2d;
1052                 os_memset(&data, 0, sizeof(data));
1053                 if (attr->config_methods)
1054                         m2d->config_methods =
1055                                 WPA_GET_BE16(attr->config_methods);
1056                 m2d->manufacturer = attr->manufacturer;
1057                 m2d->manufacturer_len = attr->manufacturer_len;
1058                 m2d->model_name = attr->model_name;
1059                 m2d->model_name_len = attr->model_name_len;
1060                 m2d->model_number = attr->model_number;
1061                 m2d->model_number_len = attr->model_number_len;
1062                 m2d->serial_number = attr->serial_number;
1063                 m2d->serial_number_len = attr->serial_number_len;
1064                 m2d->dev_name = attr->dev_name;
1065                 m2d->dev_name_len = attr->dev_name_len;
1066                 m2d->primary_dev_type = attr->primary_dev_type;
1067                 if (attr->config_error)
1068                         m2d->config_error =
1069                                 WPA_GET_BE16(attr->config_error);
1070                 if (attr->dev_password_id)
1071                         m2d->dev_password_id =
1072                                 WPA_GET_BE16(attr->dev_password_id);
1073                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
1074         }
1075
1076         wps->state = RECEIVED_M2D;
1077         return WPS_CONTINUE;
1078 }
1079
1080
1081 static enum wps_process_res wps_process_m4(struct wps_data *wps,
1082                                            const struct wpabuf *msg,
1083                                            struct wps_parse_attr *attr)
1084 {
1085         struct wpabuf *decrypted;
1086         struct wps_parse_attr eattr;
1087
1088         wpa_printf(MSG_DEBUG, "WPS: Received M4");
1089
1090         if (wps->state != RECV_M4) {
1091                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1092                            "receiving M4", wps->state);
1093                 wps->state = SEND_WSC_NACK;
1094                 return WPS_CONTINUE;
1095         }
1096
1097         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1098             wps_process_authenticator(wps, attr->authenticator, msg) ||
1099             wps_process_r_hash1(wps, attr->r_hash1) ||
1100             wps_process_r_hash2(wps, attr->r_hash2)) {
1101                 wps->state = SEND_WSC_NACK;
1102                 return WPS_CONTINUE;
1103         }
1104
1105         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1106                                               attr->encr_settings_len);
1107         if (decrypted == NULL) {
1108                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1109                            "Settings attribute");
1110                 wps->state = SEND_WSC_NACK;
1111                 return WPS_CONTINUE;
1112         }
1113
1114         if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) {
1115                 wpabuf_free(decrypted);
1116                 wps->state = SEND_WSC_NACK;
1117                 return WPS_CONTINUE;
1118         }
1119
1120         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1121                    "attribute");
1122         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1123             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1124             wps_process_r_snonce1(wps, eattr.r_snonce1)) {
1125                 wpabuf_free(decrypted);
1126                 wps->state = SEND_WSC_NACK;
1127                 return WPS_CONTINUE;
1128         }
1129         wpabuf_free(decrypted);
1130
1131         wps->state = SEND_M5;
1132         return WPS_CONTINUE;
1133 }
1134
1135
1136 static enum wps_process_res wps_process_m6(struct wps_data *wps,
1137                                            const struct wpabuf *msg,
1138                                            struct wps_parse_attr *attr)
1139 {
1140         struct wpabuf *decrypted;
1141         struct wps_parse_attr eattr;
1142
1143         wpa_printf(MSG_DEBUG, "WPS: Received M6");
1144
1145         if (wps->state != RECV_M6) {
1146                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1147                            "receiving M6", wps->state);
1148                 wps->state = SEND_WSC_NACK;
1149                 return WPS_CONTINUE;
1150         }
1151
1152         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1153             wps_process_authenticator(wps, attr->authenticator, msg)) {
1154                 wps->state = SEND_WSC_NACK;
1155                 return WPS_CONTINUE;
1156         }
1157
1158         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1159                                               attr->encr_settings_len);
1160         if (decrypted == NULL) {
1161                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1162                            "Settings attribute");
1163                 wps->state = SEND_WSC_NACK;
1164                 return WPS_CONTINUE;
1165         }
1166
1167         if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) {
1168                 wpabuf_free(decrypted);
1169                 wps->state = SEND_WSC_NACK;
1170                 return WPS_CONTINUE;
1171         }
1172
1173         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1174                    "attribute");
1175         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1176             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1177             wps_process_r_snonce2(wps, eattr.r_snonce2)) {
1178                 wpabuf_free(decrypted);
1179                 wps->state = SEND_WSC_NACK;
1180                 return WPS_CONTINUE;
1181         }
1182         wpabuf_free(decrypted);
1183
1184         if (wps->wps->ap)
1185                 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS,
1186                                    NULL);
1187
1188         wps->state = SEND_M7;
1189         return WPS_CONTINUE;
1190 }
1191
1192
1193 static enum wps_process_res wps_process_m8(struct wps_data *wps,
1194                                            const struct wpabuf *msg,
1195                                            struct wps_parse_attr *attr)
1196 {
1197         struct wpabuf *decrypted;
1198         struct wps_parse_attr eattr;
1199
1200         wpa_printf(MSG_DEBUG, "WPS: Received M8");
1201
1202         if (wps->state != RECV_M8) {
1203                 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
1204                            "receiving M8", wps->state);
1205                 wps->state = SEND_WSC_NACK;
1206                 return WPS_CONTINUE;
1207         }
1208
1209         if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
1210             wps_process_authenticator(wps, attr->authenticator, msg)) {
1211                 wps->state = SEND_WSC_NACK;
1212                 return WPS_CONTINUE;
1213         }
1214
1215         if (wps->wps->ap && wps->wps->ap_setup_locked) {
1216                 /*
1217                  * Stop here if special ap_setup_locked == 2 mode allowed the
1218                  * protocol to continue beyond M2. This allows ER to learn the
1219                  * current AP settings without changing them.
1220                  */
1221                 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
1222                            "registration of a new Registrar");
1223                 wps->config_error = WPS_CFG_SETUP_LOCKED;
1224                 wps->state = SEND_WSC_NACK;
1225                 return WPS_CONTINUE;
1226         }
1227
1228         decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
1229                                               attr->encr_settings_len);
1230         if (decrypted == NULL) {
1231                 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
1232                            "Settings attribute");
1233                 wps->state = SEND_WSC_NACK;
1234                 return WPS_CONTINUE;
1235         }
1236
1237         if (wps_validate_m8_encr(decrypted, wps->wps->ap,
1238                                  attr->version2 != NULL) < 0) {
1239                 wpabuf_free(decrypted);
1240                 wps->state = SEND_WSC_NACK;
1241                 return WPS_CONTINUE;
1242         }
1243
1244         wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
1245                    "attribute");
1246         if (wps_parse_msg(decrypted, &eattr) < 0 ||
1247             wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
1248             wps_process_creds(wps, eattr.cred, eattr.cred_len,
1249                               eattr.num_cred, attr->version2 != NULL) ||
1250             wps_process_ap_settings_e(wps, &eattr, decrypted,
1251                                       attr->version2 != NULL)) {
1252                 wpabuf_free(decrypted);
1253                 wps->state = SEND_WSC_NACK;
1254                 return WPS_CONTINUE;
1255         }
1256         wpabuf_free(decrypted);
1257
1258         wps->state = WPS_MSG_DONE;
1259         return WPS_CONTINUE;
1260 }
1261
1262
1263 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
1264                                                 const struct wpabuf *msg)
1265 {
1266         struct wps_parse_attr attr;
1267         enum wps_process_res ret = WPS_CONTINUE;
1268
1269         wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
1270
1271         if (wps_parse_msg(msg, &attr) < 0)
1272                 return WPS_FAILURE;
1273
1274         if (attr.enrollee_nonce == NULL ||
1275             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1276                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1277                 return WPS_FAILURE;
1278         }
1279
1280         if (attr.msg_type == NULL) {
1281                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1282                 wps->state = SEND_WSC_NACK;
1283                 return WPS_CONTINUE;
1284         }
1285
1286         switch (*attr.msg_type) {
1287         case WPS_M2:
1288                 if (wps_validate_m2(msg) < 0)
1289                         return WPS_FAILURE;
1290                 ret = wps_process_m2(wps, msg, &attr);
1291                 break;
1292         case WPS_M2D:
1293                 if (wps_validate_m2d(msg) < 0)
1294                         return WPS_FAILURE;
1295                 ret = wps_process_m2d(wps, &attr);
1296                 break;
1297         case WPS_M4:
1298                 if (wps_validate_m4(msg) < 0)
1299                         return WPS_FAILURE;
1300                 ret = wps_process_m4(wps, msg, &attr);
1301                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1302                         wps_fail_event(wps->wps, WPS_M4, wps->config_error,
1303                                        wps->error_indication,
1304                                        wps->peer_dev.mac_addr);
1305                 break;
1306         case WPS_M6:
1307                 if (wps_validate_m6(msg) < 0)
1308                         return WPS_FAILURE;
1309                 ret = wps_process_m6(wps, msg, &attr);
1310                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1311                         wps_fail_event(wps->wps, WPS_M6, wps->config_error,
1312                                        wps->error_indication,
1313                                        wps->peer_dev.mac_addr);
1314                 break;
1315         case WPS_M8:
1316                 if (wps_validate_m8(msg) < 0)
1317                         return WPS_FAILURE;
1318                 ret = wps_process_m8(wps, msg, &attr);
1319                 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
1320                         wps_fail_event(wps->wps, WPS_M8, wps->config_error,
1321                                        wps->error_indication,
1322                                        wps->peer_dev.mac_addr);
1323                 break;
1324         default:
1325                 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
1326                            *attr.msg_type);
1327                 return WPS_FAILURE;
1328         }
1329
1330         /*
1331          * Save a copy of the last message for Authenticator derivation if we
1332          * are continuing. However, skip M2D since it is not authenticated and
1333          * neither is the ACK/NACK response frame. This allows the possibly
1334          * following M2 to be processed correctly by using the previously sent
1335          * M1 in Authenticator derivation.
1336          */
1337         if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
1338                 /* Save a copy of the last message for Authenticator derivation
1339                  */
1340                 wpabuf_free(wps->last_msg);
1341                 wps->last_msg = wpabuf_dup(msg);
1342         }
1343
1344         return ret;
1345 }
1346
1347
1348 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
1349                                                 const struct wpabuf *msg)
1350 {
1351         struct wps_parse_attr attr;
1352
1353         wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
1354
1355         if (wps_parse_msg(msg, &attr) < 0)
1356                 return WPS_FAILURE;
1357
1358         if (attr.msg_type == NULL) {
1359                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1360                 return WPS_FAILURE;
1361         }
1362
1363         if (*attr.msg_type != WPS_WSC_ACK) {
1364                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1365                            *attr.msg_type);
1366                 return WPS_FAILURE;
1367         }
1368
1369         if (attr.registrar_nonce == NULL ||
1370             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1371         {
1372                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1373                 return WPS_FAILURE;
1374         }
1375
1376         if (attr.enrollee_nonce == NULL ||
1377             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1378                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1379                 return WPS_FAILURE;
1380         }
1381
1382         if (wps->state == RECV_ACK && wps->wps->ap) {
1383                 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
1384                            "completed successfully");
1385                 wps_success_event(wps->wps, wps->peer_dev.mac_addr);
1386                 wps->state = WPS_FINISHED;
1387                 return WPS_DONE;
1388         }
1389
1390         return WPS_FAILURE;
1391 }
1392
1393
1394 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
1395                                                  const struct wpabuf *msg)
1396 {
1397         struct wps_parse_attr attr;
1398         u16 config_error;
1399
1400         wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
1401
1402         if (wps_parse_msg(msg, &attr) < 0)
1403                 return WPS_FAILURE;
1404
1405         if (attr.msg_type == NULL) {
1406                 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
1407                 return WPS_FAILURE;
1408         }
1409
1410         if (*attr.msg_type != WPS_WSC_NACK) {
1411                 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
1412                            *attr.msg_type);
1413                 return WPS_FAILURE;
1414         }
1415
1416         if (attr.registrar_nonce == NULL ||
1417             os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0)
1418         {
1419                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
1420                 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
1421                             attr.registrar_nonce, WPS_NONCE_LEN);
1422                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
1423                             wps->nonce_r, WPS_NONCE_LEN);
1424                 return WPS_FAILURE;
1425         }
1426
1427         if (attr.enrollee_nonce == NULL ||
1428             os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) {
1429                 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
1430                 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
1431                             attr.enrollee_nonce, WPS_NONCE_LEN);
1432                 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
1433                             wps->nonce_e, WPS_NONCE_LEN);
1434                 return WPS_FAILURE;
1435         }
1436
1437         if (attr.config_error == NULL) {
1438                 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
1439                            "in WSC_NACK");
1440                 return WPS_FAILURE;
1441         }
1442
1443         config_error = WPA_GET_BE16(attr.config_error);
1444         wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
1445                    "Configuration Error %d", config_error);
1446
1447         switch (wps->state) {
1448         case RECV_M4:
1449                 wps_fail_event(wps->wps, WPS_M3, config_error,
1450                                wps->error_indication, wps->peer_dev.mac_addr);
1451                 break;
1452         case RECV_M6:
1453                 wps_fail_event(wps->wps, WPS_M5, config_error,
1454                                wps->error_indication, wps->peer_dev.mac_addr);
1455                 break;
1456         case RECV_M8:
1457                 wps_fail_event(wps->wps, WPS_M7, config_error,
1458                                wps->error_indication, wps->peer_dev.mac_addr);
1459                 break;
1460         default:
1461                 break;
1462         }
1463
1464         /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
1465          * Enrollee is Authenticator */
1466         wps->state = SEND_WSC_NACK;
1467
1468         return WPS_FAILURE;
1469 }
1470
1471
1472 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
1473                                               enum wsc_op_code op_code,
1474                                               const struct wpabuf *msg)
1475 {
1476
1477         wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
1478                    "op_code=%d)",
1479                    (unsigned long) wpabuf_len(msg), op_code);
1480
1481         if (op_code == WSC_UPnP) {
1482                 /* Determine the OpCode based on message type attribute */
1483                 struct wps_parse_attr attr;
1484                 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
1485                         if (*attr.msg_type == WPS_WSC_ACK)
1486                                 op_code = WSC_ACK;
1487                         else if (*attr.msg_type == WPS_WSC_NACK)
1488                                 op_code = WSC_NACK;
1489                 }
1490         }
1491
1492         switch (op_code) {
1493         case WSC_MSG:
1494         case WSC_UPnP:
1495                 return wps_process_wsc_msg(wps, msg);
1496         case WSC_ACK:
1497                 if (wps_validate_wsc_ack(msg) < 0)
1498                         return WPS_FAILURE;
1499                 return wps_process_wsc_ack(wps, msg);
1500         case WSC_NACK:
1501                 if (wps_validate_wsc_nack(msg) < 0)
1502                         return WPS_FAILURE;
1503                 return wps_process_wsc_nack(wps, msg);
1504         default:
1505                 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
1506                 return WPS_FAILURE;
1507         }
1508 }