1 /* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j (at) 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_mac_addr(struct wps_data *wps, struct wpabuf *msg) 20 { 21 wpa_printf(MSG_DEBUG, "WPS: * MAC Address"); 22 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 23 wpabuf_put_be16(msg, ETH_ALEN); 24 wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN); 25 return 0; 26 } 27 28 29 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 30 { 31 u8 state; 32 if (wps->wps->ap) 33 state = wps->wps->wps_state; 34 else 35 state = WPS_STATE_NOT_CONFIGURED; 36 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 37 state); 38 wpabuf_put_be16(msg, ATTR_WPS_STATE); 39 wpabuf_put_be16(msg, 1); 40 wpabuf_put_u8(msg, state); 41 return 0; 42 } 43 44 45 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 46 { 47 u8 *hash; 48 const u8 *addr[4]; 49 size_t len[4]; 50 51 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 52 return -1; 53 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 54 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 55 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 56 57 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 58 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 59 "E-Hash derivation"); 60 return -1; 61 } 62 63 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 64 wpabuf_put_be16(msg, ATTR_E_HASH1); 65 wpabuf_put_be16(msg, SHA256_MAC_LEN); 66 hash = wpabuf_put(msg, SHA256_MAC_LEN); 67 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 68 addr[0] = wps->snonce; 69 len[0] = WPS_SECRET_NONCE_LEN; 70 addr[1] = wps->psk1; 71 len[1] = WPS_PSK_LEN; 72 addr[2] = wpabuf_head(wps->dh_pubkey_e); 73 len[2] = wpabuf_len(wps->dh_pubkey_e); 74 addr[3] = wpabuf_head(wps->dh_pubkey_r); 75 len[3] = wpabuf_len(wps->dh_pubkey_r); 76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 78 79 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 80 wpabuf_put_be16(msg, ATTR_E_HASH2); 81 wpabuf_put_be16(msg, SHA256_MAC_LEN); 82 hash = wpabuf_put(msg, SHA256_MAC_LEN); 83 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 84 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 85 addr[1] = wps->psk2; 86 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 87 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 88 89 return 0; 90 } 91 92 93 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 94 { 95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 96 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 99 return 0; 100 } 101 102 103 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 104 { 105 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 106 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 107 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 108 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 109 WPS_SECRET_NONCE_LEN); 110 return 0; 111 } 112 113 114 static struct wpabuf * wps_build_m1(struct wps_data *wps) 115 { 116 struct wpabuf *msg; 117 u16 config_methods; 118 119 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 120 return NULL; 121 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 122 wps->nonce_e, WPS_NONCE_LEN); 123 124 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 125 msg = wpabuf_alloc(1000); 126 if (msg == NULL) 127 return NULL; 128 129 config_methods = wps->wps->config_methods; 130 if (wps->wps->ap && !wps->pbc_in_m1 && 131 (wps->dev_password_len != 0 || 132 (config_methods & WPS_CONFIG_DISPLAY))) { 133 /* 134 * These are the methods that the AP supports as an Enrollee 135 * for adding external Registrars, so remove PushButton. 136 * 137 * As a workaround for Windows 7 mechanism for probing WPS 138 * capabilities from M1, leave PushButton option if no PIN 139 * method is available or if WPS configuration enables PBC 140 * workaround. 141 */ 142 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 143 #ifdef CONFIG_WPS2 144 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 145 WPS_CONFIG_PHY_PUSHBUTTON); 146 #endif /* CONFIG_WPS2 */ 147 } 148 149 if (wps_build_version(msg) || 150 wps_build_msg_type(msg, WPS_M1) || 151 wps_build_uuid_e(msg, wps->uuid_e) || 152 wps_build_mac_addr(wps, msg) || 153 wps_build_enrollee_nonce(wps, msg) || 154 wps_build_public_key(wps, msg) || 155 wps_build_auth_type_flags(wps, msg) || 156 wps_build_encr_type_flags(wps, msg) || 157 wps_build_conn_type_flags(wps, msg) || 158 wps_build_config_methods(msg, config_methods) || 159 wps_build_wps_state(wps, msg) || 160 wps_build_device_attrs(&wps->wps->dev, msg) || 161 wps_build_rf_bands(&wps->wps->dev, msg) || 162 wps_build_assoc_state(wps, msg) || 163 wps_build_dev_password_id(msg, wps->dev_pw_id) || 164 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 165 wps_build_os_version(&wps->wps->dev, msg) || 166 wps_build_wfa_ext(msg, 0, NULL, 0)) { 167 wpabuf_free(msg); 168 return NULL; 169 } 170 171 wps->state = RECV_M2; 172 return msg; 173 } 174 175 176 static struct wpabuf * wps_build_m3(struct wps_data *wps) 177 { 178 struct wpabuf *msg; 179 180 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 181 182 if (wps->dev_password == NULL) { 183 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 184 return NULL; 185 } 186 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 187 188 msg = wpabuf_alloc(1000); 189 if (msg == NULL) 190 return NULL; 191 192 if (wps_build_version(msg) || 193 wps_build_msg_type(msg, WPS_M3) || 194 wps_build_registrar_nonce(wps, msg) || 195 wps_build_e_hash(wps, msg) || 196 wps_build_wfa_ext(msg, 0, NULL, 0) || 197 wps_build_authenticator(wps, msg)) { 198 wpabuf_free(msg); 199 return NULL; 200 } 201 202 wps->state = RECV_M4; 203 return msg; 204 } 205 206 207 static struct wpabuf * wps_build_m5(struct wps_data *wps) 208 { 209 struct wpabuf *msg, *plain; 210 211 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 212 213 plain = wpabuf_alloc(200); 214 if (plain == NULL) 215 return NULL; 216 217 msg = wpabuf_alloc(1000); 218 if (msg == NULL) { 219 wpabuf_free(plain); 220 return NULL; 221 } 222 223 if (wps_build_version(msg) || 224 wps_build_msg_type(msg, WPS_M5) || 225 wps_build_registrar_nonce(wps, msg) || 226 wps_build_e_snonce1(wps, plain) || 227 wps_build_key_wrap_auth(wps, plain) || 228 wps_build_encr_settings(wps, msg, plain) || 229 wps_build_wfa_ext(msg, 0, NULL, 0) || 230 wps_build_authenticator(wps, msg)) { 231 wpabuf_free(plain); 232 wpabuf_free(msg); 233 return NULL; 234 } 235 wpabuf_free(plain); 236 237 wps->state = RECV_M6; 238 return msg; 239 } 240 241 242 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 243 { 244 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 245 wpabuf_put_be16(msg, ATTR_SSID); 246 wpabuf_put_be16(msg, wps->wps->ssid_len); 247 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 248 return 0; 249 } 250 251 252 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 253 { 254 u16 auth_type = wps->wps->auth_types; 255 256 /* Select the best authentication type */ 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 else if (auth_type & WPS_AUTH_SHARED) 264 auth_type = WPS_AUTH_SHARED; 265 266 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 267 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 268 wpabuf_put_be16(msg, 2); 269 wpabuf_put_be16(msg, auth_type); 270 return 0; 271 } 272 273 274 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 275 { 276 u16 encr_type = wps->wps->encr_types; 277 278 /* Select the best encryption type */ 279 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 280 if (encr_type & WPS_ENCR_AES) 281 encr_type = WPS_ENCR_AES; 282 else if (encr_type & WPS_ENCR_TKIP) 283 encr_type = WPS_ENCR_TKIP; 284 } else { 285 if (encr_type & WPS_ENCR_WEP) 286 encr_type = WPS_ENCR_WEP; 287 else if (encr_type & WPS_ENCR_NONE) 288 encr_type = WPS_ENCR_NONE; 289 } 290 291 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 292 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 293 wpabuf_put_be16(msg, 2); 294 wpabuf_put_be16(msg, encr_type); 295 return 0; 296 } 297 298 299 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 300 { 301 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 302 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 303 wpabuf_put_be16(msg, wps->wps->network_key_len); 304 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 305 return 0; 306 } 307 308 309 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 310 { 311 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 312 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 313 wpabuf_put_be16(msg, ETH_ALEN); 314 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 315 return 0; 316 } 317 318 319 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 320 { 321 if (wps->wps->ap_settings) { 322 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 323 wpabuf_put_data(plain, wps->wps->ap_settings, 324 wps->wps->ap_settings_len); 325 return 0; 326 } 327 328 return wps_build_cred_ssid(wps, plain) || 329 wps_build_cred_mac_addr(wps, plain) || 330 wps_build_cred_auth_type(wps, plain) || 331 wps_build_cred_encr_type(wps, plain) || 332 wps_build_cred_network_key(wps, plain); 333 } 334 335 336 static struct wpabuf * wps_build_m7(struct wps_data *wps) 337 { 338 struct wpabuf *msg, *plain; 339 340 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 341 342 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 343 if (plain == NULL) 344 return NULL; 345 346 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 347 if (msg == NULL) { 348 wpabuf_free(plain); 349 return NULL; 350 } 351 352 if (wps_build_version(msg) || 353 wps_build_msg_type(msg, WPS_M7) || 354 wps_build_registrar_nonce(wps, msg) || 355 wps_build_e_snonce2(wps, plain) || 356 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 357 wps_build_key_wrap_auth(wps, plain) || 358 wps_build_encr_settings(wps, msg, plain) || 359 wps_build_wfa_ext(msg, 0, NULL, 0) || 360 wps_build_authenticator(wps, msg)) { 361 wpabuf_free(plain); 362 wpabuf_free(msg); 363 return NULL; 364 } 365 wpabuf_free(plain); 366 367 if (wps->wps->ap && wps->wps->registrar) { 368 /* 369 * If the Registrar is only learning our current configuration, 370 * it may not continue protocol run to successful completion. 371 * Store information here to make sure it remains available. 372 */ 373 wps_device_store(wps->wps->registrar, &wps->peer_dev, 374 wps->uuid_r); 375 } 376 377 wps->state = RECV_M8; 378 return msg; 379 } 380 381 382 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 383 { 384 struct wpabuf *msg; 385 386 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 387 388 msg = wpabuf_alloc(1000); 389 if (msg == NULL) 390 return NULL; 391 392 if (wps_build_version(msg) || 393 wps_build_msg_type(msg, WPS_WSC_DONE) || 394 wps_build_enrollee_nonce(wps, msg) || 395 wps_build_registrar_nonce(wps, msg) || 396 wps_build_wfa_ext(msg, 0, NULL, 0)) { 397 wpabuf_free(msg); 398 return NULL; 399 } 400 401 if (wps->wps->ap) 402 wps->state = RECV_ACK; 403 else { 404 wps_success_event(wps->wps); 405 wps->state = WPS_FINISHED; 406 } 407 return msg; 408 } 409 410 411 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 412 enum wsc_op_code *op_code) 413 { 414 struct wpabuf *msg; 415 416 switch (wps->state) { 417 case SEND_M1: 418 msg = wps_build_m1(wps); 419 *op_code = WSC_MSG; 420 break; 421 case SEND_M3: 422 msg = wps_build_m3(wps); 423 *op_code = WSC_MSG; 424 break; 425 case SEND_M5: 426 msg = wps_build_m5(wps); 427 *op_code = WSC_MSG; 428 break; 429 case SEND_M7: 430 msg = wps_build_m7(wps); 431 *op_code = WSC_MSG; 432 break; 433 case RECEIVED_M2D: 434 if (wps->wps->ap) { 435 msg = wps_build_wsc_nack(wps); 436 *op_code = WSC_NACK; 437 break; 438 } 439 msg = wps_build_wsc_ack(wps); 440 *op_code = WSC_ACK; 441 if (msg) { 442 /* Another M2/M2D may be received */ 443 wps->state = RECV_M2; 444 } 445 break; 446 case SEND_WSC_NACK: 447 msg = wps_build_wsc_nack(wps); 448 *op_code = WSC_NACK; 449 break; 450 case WPS_MSG_DONE: 451 msg = wps_build_wsc_done(wps); 452 *op_code = WSC_Done; 453 break; 454 default: 455 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 456 "a message", wps->state); 457 msg = NULL; 458 break; 459 } 460 461 if (*op_code == WSC_MSG && msg) { 462 /* Save a copy of the last message for Authenticator derivation 463 */ 464 wpabuf_free(wps->last_msg); 465 wps->last_msg = wpabuf_dup(msg); 466 } 467 468 return msg; 469 } 470 471 472 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 473 { 474 if (r_nonce == NULL) { 475 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 476 return -1; 477 } 478 479 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 480 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 481 wps->nonce_r, WPS_NONCE_LEN); 482 483 return 0; 484 } 485 486 487 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 488 { 489 if (e_nonce == NULL) { 490 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 491 return -1; 492 } 493 494 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 495 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 496 return -1; 497 } 498 499 return 0; 500 } 501 502 503 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 504 { 505 if (uuid_r == NULL) { 506 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 507 return -1; 508 } 509 510 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 511 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 512 513 return 0; 514 } 515 516 517 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 518 size_t pk_len) 519 { 520 if (pk == NULL || pk_len == 0) { 521 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 522 return -1; 523 } 524 525 #ifdef CONFIG_WPS_OOB 526 if (wps->dev_pw_id != DEV_PW_DEFAULT && 527 wps->wps->oob_conf.pubkey_hash) { 528 const u8 *addr[1]; 529 u8 hash[WPS_HASH_LEN]; 530 531 addr[0] = pk; 532 sha256_vector(1, addr, &pk_len, hash); 533 if (os_memcmp(hash, 534 wpabuf_head(wps->wps->oob_conf.pubkey_hash), 535 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 536 wpa_printf(MSG_ERROR, "WPS: Public Key hash error"); 537 return -1; 538 } 539 } 540 #endif /* CONFIG_WPS_OOB */ 541 542 wpabuf_free(wps->dh_pubkey_r); 543 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 544 if (wps->dh_pubkey_r == NULL) 545 return -1; 546 547 if (wps_derive_keys(wps) < 0) 548 return -1; 549 550 return 0; 551 } 552 553 554 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 555 { 556 if (r_hash1 == NULL) { 557 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 558 return -1; 559 } 560 561 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 562 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 563 564 return 0; 565 } 566 567 568 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 569 { 570 if (r_hash2 == NULL) { 571 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 572 return -1; 573 } 574 575 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 576 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 577 578 return 0; 579 } 580 581 582 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 583 { 584 u8 hash[SHA256_MAC_LEN]; 585 const u8 *addr[4]; 586 size_t len[4]; 587 588 if (r_snonce1 == NULL) { 589 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 590 return -1; 591 } 592 593 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 594 WPS_SECRET_NONCE_LEN); 595 596 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 597 addr[0] = r_snonce1; 598 len[0] = WPS_SECRET_NONCE_LEN; 599 addr[1] = wps->psk1; 600 len[1] = WPS_PSK_LEN; 601 addr[2] = wpabuf_head(wps->dh_pubkey_e); 602 len[2] = wpabuf_len(wps->dh_pubkey_e); 603 addr[3] = wpabuf_head(wps->dh_pubkey_r); 604 len[3] = wpabuf_len(wps->dh_pubkey_r); 605 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 606 607 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 608 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 609 "not match with the pre-committed value"); 610 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 611 wps_pwd_auth_fail_event(wps->wps, 1, 1); 612 return -1; 613 } 614 615 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 616 "half of the device password"); 617 618 return 0; 619 } 620 621 622 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 623 { 624 u8 hash[SHA256_MAC_LEN]; 625 const u8 *addr[4]; 626 size_t len[4]; 627 628 if (r_snonce2 == NULL) { 629 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 630 return -1; 631 } 632 633 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 634 WPS_SECRET_NONCE_LEN); 635 636 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 637 addr[0] = r_snonce2; 638 len[0] = WPS_SECRET_NONCE_LEN; 639 addr[1] = wps->psk2; 640 len[1] = WPS_PSK_LEN; 641 addr[2] = wpabuf_head(wps->dh_pubkey_e); 642 len[2] = wpabuf_len(wps->dh_pubkey_e); 643 addr[3] = wpabuf_head(wps->dh_pubkey_r); 644 len[3] = wpabuf_len(wps->dh_pubkey_r); 645 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 646 647 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 648 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 649 "not match with the pre-committed value"); 650 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 651 wps_pwd_auth_fail_event(wps->wps, 1, 2); 652 return -1; 653 } 654 655 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 656 "half of the device password"); 657 658 return 0; 659 } 660 661 662 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 663 size_t cred_len, int wps2) 664 { 665 struct wps_parse_attr attr; 666 struct wpabuf msg; 667 668 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 669 os_memset(&wps->cred, 0, sizeof(wps->cred)); 670 wpabuf_set(&msg, cred, cred_len); 671 if (wps_parse_msg(&msg, &attr) < 0 || 672 wps_process_cred(&attr, &wps->cred)) 673 return -1; 674 675 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 676 0) { 677 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 678 MACSTR ") does not match with own address (" MACSTR 679 ")", MAC2STR(wps->cred.mac_addr), 680 MAC2STR(wps->wps->dev.mac_addr)); 681 /* 682 * In theory, this could be consider fatal error, but there are 683 * number of deployed implementations using other address here 684 * due to unclarity in the specification. For interoperability 685 * reasons, allow this to be processed since we do not really 686 * use the MAC Address information for anything. 687 */ 688 #ifdef CONFIG_WPS_STRICT 689 if (wps2) { 690 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 691 "MAC Address in AP Settings"); 692 return -1; 693 } 694 #endif /* CONFIG_WPS_STRICT */ 695 } 696 697 #ifdef CONFIG_WPS2 698 if (!(wps->cred.encr_type & 699 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 700 if (wps->cred.encr_type & WPS_ENCR_WEP) { 701 wpa_printf(MSG_INFO, "WPS: Reject Credential " 702 "due to WEP configuration"); 703 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 704 return -2; 705 } 706 707 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 708 "invalid encr_type 0x%x", wps->cred.encr_type); 709 return -1; 710 } 711 #endif /* CONFIG_WPS2 */ 712 713 if (wps->wps->cred_cb) { 714 wps->cred.cred_attr = cred - 4; 715 wps->cred.cred_attr_len = cred_len + 4; 716 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 717 wps->cred.cred_attr = NULL; 718 wps->cred.cred_attr_len = 0; 719 } 720 721 return 0; 722 } 723 724 725 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 726 size_t cred_len[], size_t num_cred, int wps2) 727 { 728 size_t i; 729 int ok = 0; 730 731 if (wps->wps->ap) 732 return 0; 733 734 if (num_cred == 0) { 735 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 736 "received"); 737 return -1; 738 } 739 740 for (i = 0; i < num_cred; i++) { 741 int res; 742 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 743 if (res == 0) 744 ok++; 745 else if (res == -2) 746 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 747 else 748 return -1; 749 } 750 751 if (ok == 0) { 752 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 753 "received"); 754 return -1; 755 } 756 757 return 0; 758 } 759 760 761 static int wps_process_ap_settings_e(struct wps_data *wps, 762 struct wps_parse_attr *attr, 763 struct wpabuf *attrs, int wps2) 764 { 765 struct wps_credential cred; 766 767 if (!wps->wps->ap) 768 return 0; 769 770 if (wps_process_ap_settings(attr, &cred) < 0) 771 return -1; 772 773 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 774 "Registrar"); 775 776 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 777 0) { 778 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 779 MACSTR ") does not match with own address (" MACSTR 780 ")", MAC2STR(cred.mac_addr), 781 MAC2STR(wps->wps->dev.mac_addr)); 782 /* 783 * In theory, this could be consider fatal error, but there are 784 * number of deployed implementations using other address here 785 * due to unclarity in the specification. For interoperability 786 * reasons, allow this to be processed since we do not really 787 * use the MAC Address information for anything. 788 */ 789 #ifdef CONFIG_WPS_STRICT 790 if (wps2) { 791 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 792 "MAC Address in AP Settings"); 793 return -1; 794 } 795 #endif /* CONFIG_WPS_STRICT */ 796 } 797 798 #ifdef CONFIG_WPS2 799 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 800 { 801 if (cred.encr_type & WPS_ENCR_WEP) { 802 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 803 "due to WEP configuration"); 804 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 805 return -1; 806 } 807 808 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 809 "invalid encr_type 0x%x", cred.encr_type); 810 return -1; 811 } 812 #endif /* CONFIG_WPS2 */ 813 814 #ifdef CONFIG_WPS_STRICT 815 if (wps2) { 816 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 817 WPS_ENCR_TKIP || 818 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 819 WPS_AUTH_WPAPSK) { 820 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 821 "AP Settings: WPA-Personal/TKIP only"); 822 wps->error_indication = 823 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 824 return -1; 825 } 826 } 827 #endif /* CONFIG_WPS_STRICT */ 828 829 #ifdef CONFIG_WPS2 830 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 831 { 832 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 833 "TKIP+AES"); 834 cred.encr_type |= WPS_ENCR_AES; 835 } 836 837 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 838 WPS_AUTH_WPAPSK) { 839 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 840 "WPAPSK+WPA2PSK"); 841 cred.auth_type |= WPS_AUTH_WPA2PSK; 842 } 843 #endif /* CONFIG_WPS2 */ 844 845 if (wps->wps->cred_cb) { 846 cred.cred_attr = wpabuf_head(attrs); 847 cred.cred_attr_len = wpabuf_len(attrs); 848 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 849 } 850 851 return 0; 852 } 853 854 855 static enum wps_process_res wps_process_m2(struct wps_data *wps, 856 const struct wpabuf *msg, 857 struct wps_parse_attr *attr) 858 { 859 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 860 861 if (wps->state != RECV_M2) { 862 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 863 "receiving M2", wps->state); 864 wps->state = SEND_WSC_NACK; 865 return WPS_CONTINUE; 866 } 867 868 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 869 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 870 wps_process_uuid_r(wps, attr->uuid_r)) { 871 wps->state = SEND_WSC_NACK; 872 return WPS_CONTINUE; 873 } 874 875 /* 876 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 877 * special locked mode is used to allow protocol run up to M7 in order 878 * to support external Registrars that only learn the current AP 879 * configuration without changing it. 880 */ 881 if (wps->wps->ap && 882 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 883 wps->dev_password == NULL)) { 884 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 885 "registration of a new Registrar"); 886 wps->config_error = WPS_CFG_SETUP_LOCKED; 887 wps->state = SEND_WSC_NACK; 888 return WPS_CONTINUE; 889 } 890 891 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 892 wps_process_authenticator(wps, attr->authenticator, msg) || 893 wps_process_device_attrs(&wps->peer_dev, attr)) { 894 wps->state = SEND_WSC_NACK; 895 return WPS_CONTINUE; 896 } 897 898 wps->state = SEND_M3; 899 return WPS_CONTINUE; 900 } 901 902 903 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 904 struct wps_parse_attr *attr) 905 { 906 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 907 908 if (wps->state != RECV_M2) { 909 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 910 "receiving M2D", wps->state); 911 wps->state = SEND_WSC_NACK; 912 return WPS_CONTINUE; 913 } 914 915 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 916 attr->manufacturer, attr->manufacturer_len); 917 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 918 attr->model_name, attr->model_name_len); 919 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 920 attr->model_number, attr->model_number_len); 921 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 922 attr->serial_number, attr->serial_number_len); 923 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 924 attr->dev_name, attr->dev_name_len); 925 926 if (wps->wps->event_cb) { 927 union wps_event_data data; 928 struct wps_event_m2d *m2d = &data.m2d; 929 os_memset(&data, 0, sizeof(data)); 930 if (attr->config_methods) 931 m2d->config_methods = 932 WPA_GET_BE16(attr->config_methods); 933 m2d->manufacturer = attr->manufacturer; 934 m2d->manufacturer_len = attr->manufacturer_len; 935 m2d->model_name = attr->model_name; 936 m2d->model_name_len = attr->model_name_len; 937 m2d->model_number = attr->model_number; 938 m2d->model_number_len = attr->model_number_len; 939 m2d->serial_number = attr->serial_number; 940 m2d->serial_number_len = attr->serial_number_len; 941 m2d->dev_name = attr->dev_name; 942 m2d->dev_name_len = attr->dev_name_len; 943 m2d->primary_dev_type = attr->primary_dev_type; 944 if (attr->config_error) 945 m2d->config_error = 946 WPA_GET_BE16(attr->config_error); 947 if (attr->dev_password_id) 948 m2d->dev_password_id = 949 WPA_GET_BE16(attr->dev_password_id); 950 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 951 } 952 953 wps->state = RECEIVED_M2D; 954 return WPS_CONTINUE; 955 } 956 957 958 static enum wps_process_res wps_process_m4(struct wps_data *wps, 959 const struct wpabuf *msg, 960 struct wps_parse_attr *attr) 961 { 962 struct wpabuf *decrypted; 963 struct wps_parse_attr eattr; 964 965 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 966 967 if (wps->state != RECV_M4) { 968 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 969 "receiving M4", wps->state); 970 wps->state = SEND_WSC_NACK; 971 return WPS_CONTINUE; 972 } 973 974 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 975 wps_process_authenticator(wps, attr->authenticator, msg) || 976 wps_process_r_hash1(wps, attr->r_hash1) || 977 wps_process_r_hash2(wps, attr->r_hash2)) { 978 wps->state = SEND_WSC_NACK; 979 return WPS_CONTINUE; 980 } 981 982 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 983 attr->encr_settings_len); 984 if (decrypted == NULL) { 985 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 986 "Settings attribute"); 987 wps->state = SEND_WSC_NACK; 988 return WPS_CONTINUE; 989 } 990 991 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 992 wpabuf_free(decrypted); 993 wps->state = SEND_WSC_NACK; 994 return WPS_CONTINUE; 995 } 996 997 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 998 "attribute"); 999 if (wps_parse_msg(decrypted, &eattr) < 0 || 1000 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1001 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1002 wpabuf_free(decrypted); 1003 wps->state = SEND_WSC_NACK; 1004 return WPS_CONTINUE; 1005 } 1006 wpabuf_free(decrypted); 1007 1008 wps->state = SEND_M5; 1009 return WPS_CONTINUE; 1010 } 1011 1012 1013 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1014 const struct wpabuf *msg, 1015 struct wps_parse_attr *attr) 1016 { 1017 struct wpabuf *decrypted; 1018 struct wps_parse_attr eattr; 1019 1020 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1021 1022 if (wps->state != RECV_M6) { 1023 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1024 "receiving M6", wps->state); 1025 wps->state = SEND_WSC_NACK; 1026 return WPS_CONTINUE; 1027 } 1028 1029 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1030 wps_process_authenticator(wps, attr->authenticator, msg)) { 1031 wps->state = SEND_WSC_NACK; 1032 return WPS_CONTINUE; 1033 } 1034 1035 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1036 attr->encr_settings_len); 1037 if (decrypted == NULL) { 1038 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1039 "Settings attribute"); 1040 wps->state = SEND_WSC_NACK; 1041 return WPS_CONTINUE; 1042 } 1043 1044 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1045 wpabuf_free(decrypted); 1046 wps->state = SEND_WSC_NACK; 1047 return WPS_CONTINUE; 1048 } 1049 1050 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1051 "attribute"); 1052 if (wps_parse_msg(decrypted, &eattr) < 0 || 1053 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1054 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1055 wpabuf_free(decrypted); 1056 wps->state = SEND_WSC_NACK; 1057 return WPS_CONTINUE; 1058 } 1059 wpabuf_free(decrypted); 1060 1061 if (wps->wps->ap) 1062 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1063 NULL); 1064 1065 wps->state = SEND_M7; 1066 return WPS_CONTINUE; 1067 } 1068 1069 1070 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1071 const struct wpabuf *msg, 1072 struct wps_parse_attr *attr) 1073 { 1074 struct wpabuf *decrypted; 1075 struct wps_parse_attr eattr; 1076 1077 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1078 1079 if (wps->state != RECV_M8) { 1080 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1081 "receiving M8", wps->state); 1082 wps->state = SEND_WSC_NACK; 1083 return WPS_CONTINUE; 1084 } 1085 1086 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1087 wps_process_authenticator(wps, attr->authenticator, msg)) { 1088 wps->state = SEND_WSC_NACK; 1089 return WPS_CONTINUE; 1090 } 1091 1092 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1093 /* 1094 * Stop here if special ap_setup_locked == 2 mode allowed the 1095 * protocol to continue beyond M2. This allows ER to learn the 1096 * current AP settings without changing them. 1097 */ 1098 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1099 "registration of a new Registrar"); 1100 wps->config_error = WPS_CFG_SETUP_LOCKED; 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_m8_encr(decrypted, wps->wps->ap, 1115 attr->version2 != NULL) < 0) { 1116 wpabuf_free(decrypted); 1117 wps->state = SEND_WSC_NACK; 1118 return WPS_CONTINUE; 1119 } 1120 1121 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1122 "attribute"); 1123 if (wps_parse_msg(decrypted, &eattr) < 0 || 1124 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1125 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1126 eattr.num_cred, attr->version2 != NULL) || 1127 wps_process_ap_settings_e(wps, &eattr, decrypted, 1128 attr->version2 != NULL)) { 1129 wpabuf_free(decrypted); 1130 wps->state = SEND_WSC_NACK; 1131 return WPS_CONTINUE; 1132 } 1133 wpabuf_free(decrypted); 1134 1135 wps->state = WPS_MSG_DONE; 1136 return WPS_CONTINUE; 1137 } 1138 1139 1140 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1141 const struct wpabuf *msg) 1142 { 1143 struct wps_parse_attr attr; 1144 enum wps_process_res ret = WPS_CONTINUE; 1145 1146 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1147 1148 if (wps_parse_msg(msg, &attr) < 0) 1149 return WPS_FAILURE; 1150 1151 if (attr.enrollee_nonce == NULL || 1152 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1153 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1154 return WPS_FAILURE; 1155 } 1156 1157 if (attr.msg_type == NULL) { 1158 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1159 wps->state = SEND_WSC_NACK; 1160 return WPS_CONTINUE; 1161 } 1162 1163 switch (*attr.msg_type) { 1164 case WPS_M2: 1165 if (wps_validate_m2(msg) < 0) 1166 return WPS_FAILURE; 1167 ret = wps_process_m2(wps, msg, &attr); 1168 break; 1169 case WPS_M2D: 1170 if (wps_validate_m2d(msg) < 0) 1171 return WPS_FAILURE; 1172 ret = wps_process_m2d(wps, &attr); 1173 break; 1174 case WPS_M4: 1175 if (wps_validate_m4(msg) < 0) 1176 return WPS_FAILURE; 1177 ret = wps_process_m4(wps, msg, &attr); 1178 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1179 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1180 wps->error_indication); 1181 break; 1182 case WPS_M6: 1183 if (wps_validate_m6(msg) < 0) 1184 return WPS_FAILURE; 1185 ret = wps_process_m6(wps, msg, &attr); 1186 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1187 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1188 wps->error_indication); 1189 break; 1190 case WPS_M8: 1191 if (wps_validate_m8(msg) < 0) 1192 return WPS_FAILURE; 1193 ret = wps_process_m8(wps, msg, &attr); 1194 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1195 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1196 wps->error_indication); 1197 break; 1198 default: 1199 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1200 *attr.msg_type); 1201 return WPS_FAILURE; 1202 } 1203 1204 /* 1205 * Save a copy of the last message for Authenticator derivation if we 1206 * are continuing. However, skip M2D since it is not authenticated and 1207 * neither is the ACK/NACK response frame. This allows the possibly 1208 * following M2 to be processed correctly by using the previously sent 1209 * M1 in Authenticator derivation. 1210 */ 1211 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1212 /* Save a copy of the last message for Authenticator derivation 1213 */ 1214 wpabuf_free(wps->last_msg); 1215 wps->last_msg = wpabuf_dup(msg); 1216 } 1217 1218 return ret; 1219 } 1220 1221 1222 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1223 const struct wpabuf *msg) 1224 { 1225 struct wps_parse_attr attr; 1226 1227 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1228 1229 if (wps_parse_msg(msg, &attr) < 0) 1230 return WPS_FAILURE; 1231 1232 if (attr.msg_type == NULL) { 1233 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1234 return WPS_FAILURE; 1235 } 1236 1237 if (*attr.msg_type != WPS_WSC_ACK) { 1238 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1239 *attr.msg_type); 1240 return WPS_FAILURE; 1241 } 1242 1243 if (attr.registrar_nonce == NULL || 1244 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1245 { 1246 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1247 return WPS_FAILURE; 1248 } 1249 1250 if (attr.enrollee_nonce == NULL || 1251 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1252 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1253 return WPS_FAILURE; 1254 } 1255 1256 if (wps->state == RECV_ACK && wps->wps->ap) { 1257 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1258 "completed successfully"); 1259 wps_success_event(wps->wps); 1260 wps->state = WPS_FINISHED; 1261 return WPS_DONE; 1262 } 1263 1264 return WPS_FAILURE; 1265 } 1266 1267 1268 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1269 const struct wpabuf *msg) 1270 { 1271 struct wps_parse_attr attr; 1272 u16 config_error; 1273 1274 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1275 1276 if (wps_parse_msg(msg, &attr) < 0) 1277 return WPS_FAILURE; 1278 1279 if (attr.msg_type == NULL) { 1280 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1281 return WPS_FAILURE; 1282 } 1283 1284 if (*attr.msg_type != WPS_WSC_NACK) { 1285 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1286 *attr.msg_type); 1287 return WPS_FAILURE; 1288 } 1289 1290 if (attr.registrar_nonce == NULL || 1291 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1292 { 1293 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1294 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1295 attr.registrar_nonce, WPS_NONCE_LEN); 1296 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1297 wps->nonce_r, WPS_NONCE_LEN); 1298 return WPS_FAILURE; 1299 } 1300 1301 if (attr.enrollee_nonce == NULL || 1302 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1303 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1304 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1305 attr.enrollee_nonce, WPS_NONCE_LEN); 1306 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1307 wps->nonce_e, WPS_NONCE_LEN); 1308 return WPS_FAILURE; 1309 } 1310 1311 if (attr.config_error == NULL) { 1312 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1313 "in WSC_NACK"); 1314 return WPS_FAILURE; 1315 } 1316 1317 config_error = WPA_GET_BE16(attr.config_error); 1318 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1319 "Configuration Error %d", config_error); 1320 1321 switch (wps->state) { 1322 case RECV_M4: 1323 wps_fail_event(wps->wps, WPS_M3, config_error, 1324 wps->error_indication); 1325 break; 1326 case RECV_M6: 1327 wps_fail_event(wps->wps, WPS_M5, config_error, 1328 wps->error_indication); 1329 break; 1330 case RECV_M8: 1331 wps_fail_event(wps->wps, WPS_M7, config_error, 1332 wps->error_indication); 1333 break; 1334 default: 1335 break; 1336 } 1337 1338 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1339 * Enrollee is Authenticator */ 1340 wps->state = SEND_WSC_NACK; 1341 1342 return WPS_FAILURE; 1343 } 1344 1345 1346 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1347 enum wsc_op_code op_code, 1348 const struct wpabuf *msg) 1349 { 1350 1351 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1352 "op_code=%d)", 1353 (unsigned long) wpabuf_len(msg), op_code); 1354 1355 if (op_code == WSC_UPnP) { 1356 /* Determine the OpCode based on message type attribute */ 1357 struct wps_parse_attr attr; 1358 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1359 if (*attr.msg_type == WPS_WSC_ACK) 1360 op_code = WSC_ACK; 1361 else if (*attr.msg_type == WPS_WSC_NACK) 1362 op_code = WSC_NACK; 1363 } 1364 } 1365 1366 switch (op_code) { 1367 case WSC_MSG: 1368 case WSC_UPnP: 1369 return wps_process_wsc_msg(wps, msg); 1370 case WSC_ACK: 1371 if (wps_validate_wsc_ack(msg) < 0) 1372 return WPS_FAILURE; 1373 return wps_process_wsc_ack(wps, msg); 1374 case WSC_NACK: 1375 if (wps_validate_wsc_nack(msg) < 0) 1376 return WPS_FAILURE; 1377 return wps_process_wsc_nack(wps, msg); 1378 default: 1379 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1380 return WPS_FAILURE; 1381 } 1382 } 1383
