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 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 168 wpabuf_free(msg); 169 return NULL; 170 } 171 172 wps->state = RECV_M2; 173 return msg; 174 } 175 176 177 static struct wpabuf * wps_build_m3(struct wps_data *wps) 178 { 179 struct wpabuf *msg; 180 181 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 182 183 if (wps->dev_password == NULL) { 184 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 185 return NULL; 186 } 187 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 188 189 msg = wpabuf_alloc(1000); 190 if (msg == NULL) 191 return NULL; 192 193 if (wps_build_version(msg) || 194 wps_build_msg_type(msg, WPS_M3) || 195 wps_build_registrar_nonce(wps, msg) || 196 wps_build_e_hash(wps, msg) || 197 wps_build_wfa_ext(msg, 0, NULL, 0) || 198 wps_build_authenticator(wps, msg)) { 199 wpabuf_free(msg); 200 return NULL; 201 } 202 203 wps->state = RECV_M4; 204 return msg; 205 } 206 207 208 static struct wpabuf * wps_build_m5(struct wps_data *wps) 209 { 210 struct wpabuf *msg, *plain; 211 212 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 213 214 plain = wpabuf_alloc(200); 215 if (plain == NULL) 216 return NULL; 217 218 msg = wpabuf_alloc(1000); 219 if (msg == NULL) { 220 wpabuf_free(plain); 221 return NULL; 222 } 223 224 if (wps_build_version(msg) || 225 wps_build_msg_type(msg, WPS_M5) || 226 wps_build_registrar_nonce(wps, msg) || 227 wps_build_e_snonce1(wps, plain) || 228 wps_build_key_wrap_auth(wps, plain) || 229 wps_build_encr_settings(wps, msg, plain) || 230 wps_build_wfa_ext(msg, 0, NULL, 0) || 231 wps_build_authenticator(wps, msg)) { 232 wpabuf_free(plain); 233 wpabuf_free(msg); 234 return NULL; 235 } 236 wpabuf_free(plain); 237 238 wps->state = RECV_M6; 239 return msg; 240 } 241 242 243 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 244 { 245 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 246 wpabuf_put_be16(msg, ATTR_SSID); 247 wpabuf_put_be16(msg, wps->wps->ssid_len); 248 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 249 return 0; 250 } 251 252 253 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 254 { 255 u16 auth_type = wps->wps->auth_types; 256 257 /* Select the best authentication type */ 258 if (auth_type & WPS_AUTH_WPA2PSK) 259 auth_type = WPS_AUTH_WPA2PSK; 260 else if (auth_type & WPS_AUTH_WPAPSK) 261 auth_type = WPS_AUTH_WPAPSK; 262 else if (auth_type & WPS_AUTH_OPEN) 263 auth_type = WPS_AUTH_OPEN; 264 else if (auth_type & WPS_AUTH_SHARED) 265 auth_type = WPS_AUTH_SHARED; 266 267 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 268 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 269 wpabuf_put_be16(msg, 2); 270 wpabuf_put_be16(msg, auth_type); 271 return 0; 272 } 273 274 275 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 276 { 277 u16 encr_type = wps->wps->encr_types; 278 279 /* Select the best encryption type */ 280 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 281 if (encr_type & WPS_ENCR_AES) 282 encr_type = WPS_ENCR_AES; 283 else if (encr_type & WPS_ENCR_TKIP) 284 encr_type = WPS_ENCR_TKIP; 285 } else { 286 if (encr_type & WPS_ENCR_WEP) 287 encr_type = WPS_ENCR_WEP; 288 else if (encr_type & WPS_ENCR_NONE) 289 encr_type = WPS_ENCR_NONE; 290 } 291 292 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 293 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 294 wpabuf_put_be16(msg, 2); 295 wpabuf_put_be16(msg, encr_type); 296 return 0; 297 } 298 299 300 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 301 { 302 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 303 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 304 wpabuf_put_be16(msg, wps->wps->network_key_len); 305 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 306 return 0; 307 } 308 309 310 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 311 { 312 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 313 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 314 wpabuf_put_be16(msg, ETH_ALEN); 315 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 316 return 0; 317 } 318 319 320 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 321 { 322 if (wps->wps->ap_settings) { 323 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 324 wpabuf_put_data(plain, wps->wps->ap_settings, 325 wps->wps->ap_settings_len); 326 return 0; 327 } 328 329 return wps_build_cred_ssid(wps, plain) || 330 wps_build_cred_mac_addr(wps, plain) || 331 wps_build_cred_auth_type(wps, plain) || 332 wps_build_cred_encr_type(wps, plain) || 333 wps_build_cred_network_key(wps, plain); 334 } 335 336 337 static struct wpabuf * wps_build_m7(struct wps_data *wps) 338 { 339 struct wpabuf *msg, *plain; 340 341 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 342 343 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 344 if (plain == NULL) 345 return NULL; 346 347 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 348 if (msg == NULL) { 349 wpabuf_free(plain); 350 return NULL; 351 } 352 353 if (wps_build_version(msg) || 354 wps_build_msg_type(msg, WPS_M7) || 355 wps_build_registrar_nonce(wps, msg) || 356 wps_build_e_snonce2(wps, plain) || 357 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 358 wps_build_key_wrap_auth(wps, plain) || 359 wps_build_encr_settings(wps, msg, plain) || 360 wps_build_wfa_ext(msg, 0, NULL, 0) || 361 wps_build_authenticator(wps, msg)) { 362 wpabuf_free(plain); 363 wpabuf_free(msg); 364 return NULL; 365 } 366 wpabuf_free(plain); 367 368 if (wps->wps->ap && wps->wps->registrar) { 369 /* 370 * If the Registrar is only learning our current configuration, 371 * it may not continue protocol run to successful completion. 372 * Store information here to make sure it remains available. 373 */ 374 wps_device_store(wps->wps->registrar, &wps->peer_dev, 375 wps->uuid_r); 376 } 377 378 wps->state = RECV_M8; 379 return msg; 380 } 381 382 383 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 384 { 385 struct wpabuf *msg; 386 387 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 388 389 msg = wpabuf_alloc(1000); 390 if (msg == NULL) 391 return NULL; 392 393 if (wps_build_version(msg) || 394 wps_build_msg_type(msg, WPS_WSC_DONE) || 395 wps_build_enrollee_nonce(wps, msg) || 396 wps_build_registrar_nonce(wps, msg) || 397 wps_build_wfa_ext(msg, 0, NULL, 0)) { 398 wpabuf_free(msg); 399 return NULL; 400 } 401 402 if (wps->wps->ap) 403 wps->state = RECV_ACK; 404 else { 405 wps_success_event(wps->wps); 406 wps->state = WPS_FINISHED; 407 } 408 return msg; 409 } 410 411 412 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 413 enum wsc_op_code *op_code) 414 { 415 struct wpabuf *msg; 416 417 switch (wps->state) { 418 case SEND_M1: 419 msg = wps_build_m1(wps); 420 *op_code = WSC_MSG; 421 break; 422 case SEND_M3: 423 msg = wps_build_m3(wps); 424 *op_code = WSC_MSG; 425 break; 426 case SEND_M5: 427 msg = wps_build_m5(wps); 428 *op_code = WSC_MSG; 429 break; 430 case SEND_M7: 431 msg = wps_build_m7(wps); 432 *op_code = WSC_MSG; 433 break; 434 case RECEIVED_M2D: 435 if (wps->wps->ap) { 436 msg = wps_build_wsc_nack(wps); 437 *op_code = WSC_NACK; 438 break; 439 } 440 msg = wps_build_wsc_ack(wps); 441 *op_code = WSC_ACK; 442 if (msg) { 443 /* Another M2/M2D may be received */ 444 wps->state = RECV_M2; 445 } 446 break; 447 case SEND_WSC_NACK: 448 msg = wps_build_wsc_nack(wps); 449 *op_code = WSC_NACK; 450 break; 451 case WPS_MSG_DONE: 452 msg = wps_build_wsc_done(wps); 453 *op_code = WSC_Done; 454 break; 455 default: 456 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 457 "a message", wps->state); 458 msg = NULL; 459 break; 460 } 461 462 if (*op_code == WSC_MSG && msg) { 463 /* Save a copy of the last message for Authenticator derivation 464 */ 465 wpabuf_free(wps->last_msg); 466 wps->last_msg = wpabuf_dup(msg); 467 } 468 469 return msg; 470 } 471 472 473 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 474 { 475 if (r_nonce == NULL) { 476 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 477 return -1; 478 } 479 480 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 481 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 482 wps->nonce_r, WPS_NONCE_LEN); 483 484 return 0; 485 } 486 487 488 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 489 { 490 if (e_nonce == NULL) { 491 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 492 return -1; 493 } 494 495 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 496 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 497 return -1; 498 } 499 500 return 0; 501 } 502 503 504 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 505 { 506 if (uuid_r == NULL) { 507 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 508 return -1; 509 } 510 511 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 512 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 513 514 return 0; 515 } 516 517 518 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 519 size_t pk_len) 520 { 521 if (pk == NULL || pk_len == 0) { 522 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 523 return -1; 524 } 525 526 #ifdef CONFIG_WPS_OOB 527 if (wps->dev_pw_id != DEV_PW_DEFAULT && 528 wps->wps->oob_conf.pubkey_hash) { 529 const u8 *addr[1]; 530 u8 hash[WPS_HASH_LEN]; 531 532 addr[0] = pk; 533 sha256_vector(1, addr, &pk_len, hash); 534 if (os_memcmp(hash, 535 wpabuf_head(wps->wps->oob_conf.pubkey_hash), 536 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 537 wpa_printf(MSG_ERROR, "WPS: Public Key hash error"); 538 return -1; 539 } 540 } 541 #endif /* CONFIG_WPS_OOB */ 542 543 wpabuf_free(wps->dh_pubkey_r); 544 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 545 if (wps->dh_pubkey_r == NULL) 546 return -1; 547 548 if (wps_derive_keys(wps) < 0) 549 return -1; 550 551 return 0; 552 } 553 554 555 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 556 { 557 if (r_hash1 == NULL) { 558 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 559 return -1; 560 } 561 562 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 563 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 564 565 return 0; 566 } 567 568 569 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 570 { 571 if (r_hash2 == NULL) { 572 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 573 return -1; 574 } 575 576 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 577 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 578 579 return 0; 580 } 581 582 583 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 584 { 585 u8 hash[SHA256_MAC_LEN]; 586 const u8 *addr[4]; 587 size_t len[4]; 588 589 if (r_snonce1 == NULL) { 590 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 591 return -1; 592 } 593 594 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 595 WPS_SECRET_NONCE_LEN); 596 597 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 598 addr[0] = r_snonce1; 599 len[0] = WPS_SECRET_NONCE_LEN; 600 addr[1] = wps->psk1; 601 len[1] = WPS_PSK_LEN; 602 addr[2] = wpabuf_head(wps->dh_pubkey_e); 603 len[2] = wpabuf_len(wps->dh_pubkey_e); 604 addr[3] = wpabuf_head(wps->dh_pubkey_r); 605 len[3] = wpabuf_len(wps->dh_pubkey_r); 606 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 607 608 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 609 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 610 "not match with the pre-committed value"); 611 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 612 wps_pwd_auth_fail_event(wps->wps, 1, 1); 613 return -1; 614 } 615 616 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 617 "half of the device password"); 618 619 return 0; 620 } 621 622 623 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 624 { 625 u8 hash[SHA256_MAC_LEN]; 626 const u8 *addr[4]; 627 size_t len[4]; 628 629 if (r_snonce2 == NULL) { 630 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 631 return -1; 632 } 633 634 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 635 WPS_SECRET_NONCE_LEN); 636 637 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 638 addr[0] = r_snonce2; 639 len[0] = WPS_SECRET_NONCE_LEN; 640 addr[1] = wps->psk2; 641 len[1] = WPS_PSK_LEN; 642 addr[2] = wpabuf_head(wps->dh_pubkey_e); 643 len[2] = wpabuf_len(wps->dh_pubkey_e); 644 addr[3] = wpabuf_head(wps->dh_pubkey_r); 645 len[3] = wpabuf_len(wps->dh_pubkey_r); 646 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 647 648 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 649 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 650 "not match with the pre-committed value"); 651 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 652 wps_pwd_auth_fail_event(wps->wps, 1, 2); 653 return -1; 654 } 655 656 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 657 "half of the device password"); 658 659 return 0; 660 } 661 662 663 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 664 size_t cred_len, int wps2) 665 { 666 struct wps_parse_attr attr; 667 struct wpabuf msg; 668 669 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 670 os_memset(&wps->cred, 0, sizeof(wps->cred)); 671 wpabuf_set(&msg, cred, cred_len); 672 if (wps_parse_msg(&msg, &attr) < 0 || 673 wps_process_cred(&attr, &wps->cred)) 674 return -1; 675 676 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 677 0) { 678 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 679 MACSTR ") does not match with own address (" MACSTR 680 ")", MAC2STR(wps->cred.mac_addr), 681 MAC2STR(wps->wps->dev.mac_addr)); 682 /* 683 * In theory, this could be consider fatal error, but there are 684 * number of deployed implementations using other address here 685 * due to unclarity in the specification. For interoperability 686 * reasons, allow this to be processed since we do not really 687 * use the MAC Address information for anything. 688 */ 689 #ifdef CONFIG_WPS_STRICT 690 if (wps2) { 691 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 692 "MAC Address in AP Settings"); 693 return -1; 694 } 695 #endif /* CONFIG_WPS_STRICT */ 696 } 697 698 #ifdef CONFIG_WPS2 699 if (!(wps->cred.encr_type & 700 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 701 if (wps->cred.encr_type & WPS_ENCR_WEP) { 702 wpa_printf(MSG_INFO, "WPS: Reject Credential " 703 "due to WEP configuration"); 704 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 705 return -2; 706 } 707 708 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 709 "invalid encr_type 0x%x", wps->cred.encr_type); 710 return -1; 711 } 712 #endif /* CONFIG_WPS2 */ 713 714 if (wps->wps->cred_cb) { 715 wps->cred.cred_attr = cred - 4; 716 wps->cred.cred_attr_len = cred_len + 4; 717 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 718 wps->cred.cred_attr = NULL; 719 wps->cred.cred_attr_len = 0; 720 } 721 722 return 0; 723 } 724 725 726 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 727 size_t cred_len[], size_t num_cred, int wps2) 728 { 729 size_t i; 730 int ok = 0; 731 732 if (wps->wps->ap) 733 return 0; 734 735 if (num_cred == 0) { 736 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 737 "received"); 738 return -1; 739 } 740 741 for (i = 0; i < num_cred; i++) { 742 int res; 743 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 744 if (res == 0) 745 ok++; 746 else if (res == -2) 747 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 748 else 749 return -1; 750 } 751 752 if (ok == 0) { 753 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 754 "received"); 755 return -1; 756 } 757 758 return 0; 759 } 760 761 762 static int wps_process_ap_settings_e(struct wps_data *wps, 763 struct wps_parse_attr *attr, 764 struct wpabuf *attrs, int wps2) 765 { 766 struct wps_credential cred; 767 768 if (!wps->wps->ap) 769 return 0; 770 771 if (wps_process_ap_settings(attr, &cred) < 0) 772 return -1; 773 774 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 775 "Registrar"); 776 777 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 778 0) { 779 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 780 MACSTR ") does not match with own address (" MACSTR 781 ")", MAC2STR(cred.mac_addr), 782 MAC2STR(wps->wps->dev.mac_addr)); 783 /* 784 * In theory, this could be consider fatal error, but there are 785 * number of deployed implementations using other address here 786 * due to unclarity in the specification. For interoperability 787 * reasons, allow this to be processed since we do not really 788 * use the MAC Address information for anything. 789 */ 790 #ifdef CONFIG_WPS_STRICT 791 if (wps2) { 792 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 793 "MAC Address in AP Settings"); 794 return -1; 795 } 796 #endif /* CONFIG_WPS_STRICT */ 797 } 798 799 #ifdef CONFIG_WPS2 800 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 801 { 802 if (cred.encr_type & WPS_ENCR_WEP) { 803 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 804 "due to WEP configuration"); 805 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 806 return -1; 807 } 808 809 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 810 "invalid encr_type 0x%x", cred.encr_type); 811 return -1; 812 } 813 #endif /* CONFIG_WPS2 */ 814 815 #ifdef CONFIG_WPS_STRICT 816 if (wps2) { 817 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 818 WPS_ENCR_TKIP || 819 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 820 WPS_AUTH_WPAPSK) { 821 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 822 "AP Settings: WPA-Personal/TKIP only"); 823 wps->error_indication = 824 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 825 return -1; 826 } 827 } 828 #endif /* CONFIG_WPS_STRICT */ 829 830 #ifdef CONFIG_WPS2 831 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 832 { 833 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 834 "TKIP+AES"); 835 cred.encr_type |= WPS_ENCR_AES; 836 } 837 838 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 839 WPS_AUTH_WPAPSK) { 840 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 841 "WPAPSK+WPA2PSK"); 842 cred.auth_type |= WPS_AUTH_WPA2PSK; 843 } 844 #endif /* CONFIG_WPS2 */ 845 846 if (wps->wps->cred_cb) { 847 cred.cred_attr = wpabuf_head(attrs); 848 cred.cred_attr_len = wpabuf_len(attrs); 849 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 850 } 851 852 return 0; 853 } 854 855 856 static enum wps_process_res wps_process_m2(struct wps_data *wps, 857 const struct wpabuf *msg, 858 struct wps_parse_attr *attr) 859 { 860 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 861 862 if (wps->state != RECV_M2) { 863 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 864 "receiving M2", wps->state); 865 wps->state = SEND_WSC_NACK; 866 return WPS_CONTINUE; 867 } 868 869 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 870 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 871 wps_process_uuid_r(wps, attr->uuid_r)) { 872 wps->state = SEND_WSC_NACK; 873 return WPS_CONTINUE; 874 } 875 876 /* 877 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 878 * special locked mode is used to allow protocol run up to M7 in order 879 * to support external Registrars that only learn the current AP 880 * configuration without changing it. 881 */ 882 if (wps->wps->ap && 883 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 884 wps->dev_password == NULL)) { 885 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 886 "registration of a new Registrar"); 887 wps->config_error = WPS_CFG_SETUP_LOCKED; 888 wps->state = SEND_WSC_NACK; 889 return WPS_CONTINUE; 890 } 891 892 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 893 wps_process_authenticator(wps, attr->authenticator, msg) || 894 wps_process_device_attrs(&wps->peer_dev, attr)) { 895 wps->state = SEND_WSC_NACK; 896 return WPS_CONTINUE; 897 } 898 899 wps->state = SEND_M3; 900 return WPS_CONTINUE; 901 } 902 903 904 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 905 struct wps_parse_attr *attr) 906 { 907 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 908 909 if (wps->state != RECV_M2) { 910 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 911 "receiving M2D", wps->state); 912 wps->state = SEND_WSC_NACK; 913 return WPS_CONTINUE; 914 } 915 916 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 917 attr->manufacturer, attr->manufacturer_len); 918 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 919 attr->model_name, attr->model_name_len); 920 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 921 attr->model_number, attr->model_number_len); 922 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 923 attr->serial_number, attr->serial_number_len); 924 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 925 attr->dev_name, attr->dev_name_len); 926 927 if (wps->wps->event_cb) { 928 union wps_event_data data; 929 struct wps_event_m2d *m2d = &data.m2d; 930 os_memset(&data, 0, sizeof(data)); 931 if (attr->config_methods) 932 m2d->config_methods = 933 WPA_GET_BE16(attr->config_methods); 934 m2d->manufacturer = attr->manufacturer; 935 m2d->manufacturer_len = attr->manufacturer_len; 936 m2d->model_name = attr->model_name; 937 m2d->model_name_len = attr->model_name_len; 938 m2d->model_number = attr->model_number; 939 m2d->model_number_len = attr->model_number_len; 940 m2d->serial_number = attr->serial_number; 941 m2d->serial_number_len = attr->serial_number_len; 942 m2d->dev_name = attr->dev_name; 943 m2d->dev_name_len = attr->dev_name_len; 944 m2d->primary_dev_type = attr->primary_dev_type; 945 if (attr->config_error) 946 m2d->config_error = 947 WPA_GET_BE16(attr->config_error); 948 if (attr->dev_password_id) 949 m2d->dev_password_id = 950 WPA_GET_BE16(attr->dev_password_id); 951 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 952 } 953 954 wps->state = RECEIVED_M2D; 955 return WPS_CONTINUE; 956 } 957 958 959 static enum wps_process_res wps_process_m4(struct wps_data *wps, 960 const struct wpabuf *msg, 961 struct wps_parse_attr *attr) 962 { 963 struct wpabuf *decrypted; 964 struct wps_parse_attr eattr; 965 966 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 967 968 if (wps->state != RECV_M4) { 969 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 970 "receiving M4", wps->state); 971 wps->state = SEND_WSC_NACK; 972 return WPS_CONTINUE; 973 } 974 975 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 976 wps_process_authenticator(wps, attr->authenticator, msg) || 977 wps_process_r_hash1(wps, attr->r_hash1) || 978 wps_process_r_hash2(wps, attr->r_hash2)) { 979 wps->state = SEND_WSC_NACK; 980 return WPS_CONTINUE; 981 } 982 983 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 984 attr->encr_settings_len); 985 if (decrypted == NULL) { 986 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 987 "Settings attribute"); 988 wps->state = SEND_WSC_NACK; 989 return WPS_CONTINUE; 990 } 991 992 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 993 wpabuf_free(decrypted); 994 wps->state = SEND_WSC_NACK; 995 return WPS_CONTINUE; 996 } 997 998 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 999 "attribute"); 1000 if (wps_parse_msg(decrypted, &eattr) < 0 || 1001 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1002 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1003 wpabuf_free(decrypted); 1004 wps->state = SEND_WSC_NACK; 1005 return WPS_CONTINUE; 1006 } 1007 wpabuf_free(decrypted); 1008 1009 wps->state = SEND_M5; 1010 return WPS_CONTINUE; 1011 } 1012 1013 1014 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1015 const struct wpabuf *msg, 1016 struct wps_parse_attr *attr) 1017 { 1018 struct wpabuf *decrypted; 1019 struct wps_parse_attr eattr; 1020 1021 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1022 1023 if (wps->state != RECV_M6) { 1024 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1025 "receiving M6", wps->state); 1026 wps->state = SEND_WSC_NACK; 1027 return WPS_CONTINUE; 1028 } 1029 1030 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1031 wps_process_authenticator(wps, attr->authenticator, msg)) { 1032 wps->state = SEND_WSC_NACK; 1033 return WPS_CONTINUE; 1034 } 1035 1036 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1037 attr->encr_settings_len); 1038 if (decrypted == NULL) { 1039 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1040 "Settings attribute"); 1041 wps->state = SEND_WSC_NACK; 1042 return WPS_CONTINUE; 1043 } 1044 1045 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1046 wpabuf_free(decrypted); 1047 wps->state = SEND_WSC_NACK; 1048 return WPS_CONTINUE; 1049 } 1050 1051 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1052 "attribute"); 1053 if (wps_parse_msg(decrypted, &eattr) < 0 || 1054 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1055 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1056 wpabuf_free(decrypted); 1057 wps->state = SEND_WSC_NACK; 1058 return WPS_CONTINUE; 1059 } 1060 wpabuf_free(decrypted); 1061 1062 if (wps->wps->ap) 1063 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1064 NULL); 1065 1066 wps->state = SEND_M7; 1067 return WPS_CONTINUE; 1068 } 1069 1070 1071 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1072 const struct wpabuf *msg, 1073 struct wps_parse_attr *attr) 1074 { 1075 struct wpabuf *decrypted; 1076 struct wps_parse_attr eattr; 1077 1078 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1079 1080 if (wps->state != RECV_M8) { 1081 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1082 "receiving M8", wps->state); 1083 wps->state = SEND_WSC_NACK; 1084 return WPS_CONTINUE; 1085 } 1086 1087 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1088 wps_process_authenticator(wps, attr->authenticator, msg)) { 1089 wps->state = SEND_WSC_NACK; 1090 return WPS_CONTINUE; 1091 } 1092 1093 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1094 /* 1095 * Stop here if special ap_setup_locked == 2 mode allowed the 1096 * protocol to continue beyond M2. This allows ER to learn the 1097 * current AP settings without changing them. 1098 */ 1099 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1100 "registration of a new Registrar"); 1101 wps->config_error = WPS_CFG_SETUP_LOCKED; 1102 wps->state = SEND_WSC_NACK; 1103 return WPS_CONTINUE; 1104 } 1105 1106 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1107 attr->encr_settings_len); 1108 if (decrypted == NULL) { 1109 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1110 "Settings attribute"); 1111 wps->state = SEND_WSC_NACK; 1112 return WPS_CONTINUE; 1113 } 1114 1115 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1116 attr->version2 != NULL) < 0) { 1117 wpabuf_free(decrypted); 1118 wps->state = SEND_WSC_NACK; 1119 return WPS_CONTINUE; 1120 } 1121 1122 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1123 "attribute"); 1124 if (wps_parse_msg(decrypted, &eattr) < 0 || 1125 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1126 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1127 eattr.num_cred, attr->version2 != NULL) || 1128 wps_process_ap_settings_e(wps, &eattr, decrypted, 1129 attr->version2 != NULL)) { 1130 wpabuf_free(decrypted); 1131 wps->state = SEND_WSC_NACK; 1132 return WPS_CONTINUE; 1133 } 1134 wpabuf_free(decrypted); 1135 1136 wps->state = WPS_MSG_DONE; 1137 return WPS_CONTINUE; 1138 } 1139 1140 1141 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1142 const struct wpabuf *msg) 1143 { 1144 struct wps_parse_attr attr; 1145 enum wps_process_res ret = WPS_CONTINUE; 1146 1147 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1148 1149 if (wps_parse_msg(msg, &attr) < 0) 1150 return WPS_FAILURE; 1151 1152 if (attr.enrollee_nonce == NULL || 1153 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1154 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1155 return WPS_FAILURE; 1156 } 1157 1158 if (attr.msg_type == NULL) { 1159 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1160 wps->state = SEND_WSC_NACK; 1161 return WPS_CONTINUE; 1162 } 1163 1164 switch (*attr.msg_type) { 1165 case WPS_M2: 1166 if (wps_validate_m2(msg) < 0) 1167 return WPS_FAILURE; 1168 ret = wps_process_m2(wps, msg, &attr); 1169 break; 1170 case WPS_M2D: 1171 if (wps_validate_m2d(msg) < 0) 1172 return WPS_FAILURE; 1173 ret = wps_process_m2d(wps, &attr); 1174 break; 1175 case WPS_M4: 1176 if (wps_validate_m4(msg) < 0) 1177 return WPS_FAILURE; 1178 ret = wps_process_m4(wps, msg, &attr); 1179 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1180 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1181 wps->error_indication); 1182 break; 1183 case WPS_M6: 1184 if (wps_validate_m6(msg) < 0) 1185 return WPS_FAILURE; 1186 ret = wps_process_m6(wps, msg, &attr); 1187 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1188 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1189 wps->error_indication); 1190 break; 1191 case WPS_M8: 1192 if (wps_validate_m8(msg) < 0) 1193 return WPS_FAILURE; 1194 ret = wps_process_m8(wps, msg, &attr); 1195 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1196 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1197 wps->error_indication); 1198 break; 1199 default: 1200 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1201 *attr.msg_type); 1202 return WPS_FAILURE; 1203 } 1204 1205 /* 1206 * Save a copy of the last message for Authenticator derivation if we 1207 * are continuing. However, skip M2D since it is not authenticated and 1208 * neither is the ACK/NACK response frame. This allows the possibly 1209 * following M2 to be processed correctly by using the previously sent 1210 * M1 in Authenticator derivation. 1211 */ 1212 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1213 /* Save a copy of the last message for Authenticator derivation 1214 */ 1215 wpabuf_free(wps->last_msg); 1216 wps->last_msg = wpabuf_dup(msg); 1217 } 1218 1219 return ret; 1220 } 1221 1222 1223 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1224 const struct wpabuf *msg) 1225 { 1226 struct wps_parse_attr attr; 1227 1228 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1229 1230 if (wps_parse_msg(msg, &attr) < 0) 1231 return WPS_FAILURE; 1232 1233 if (attr.msg_type == NULL) { 1234 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1235 return WPS_FAILURE; 1236 } 1237 1238 if (*attr.msg_type != WPS_WSC_ACK) { 1239 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1240 *attr.msg_type); 1241 return WPS_FAILURE; 1242 } 1243 1244 if (attr.registrar_nonce == NULL || 1245 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1246 { 1247 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1248 return WPS_FAILURE; 1249 } 1250 1251 if (attr.enrollee_nonce == NULL || 1252 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1253 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1254 return WPS_FAILURE; 1255 } 1256 1257 if (wps->state == RECV_ACK && wps->wps->ap) { 1258 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1259 "completed successfully"); 1260 wps_success_event(wps->wps); 1261 wps->state = WPS_FINISHED; 1262 return WPS_DONE; 1263 } 1264 1265 return WPS_FAILURE; 1266 } 1267 1268 1269 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1270 const struct wpabuf *msg) 1271 { 1272 struct wps_parse_attr attr; 1273 u16 config_error; 1274 1275 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1276 1277 if (wps_parse_msg(msg, &attr) < 0) 1278 return WPS_FAILURE; 1279 1280 if (attr.msg_type == NULL) { 1281 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1282 return WPS_FAILURE; 1283 } 1284 1285 if (*attr.msg_type != WPS_WSC_NACK) { 1286 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1287 *attr.msg_type); 1288 return WPS_FAILURE; 1289 } 1290 1291 if (attr.registrar_nonce == NULL || 1292 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1293 { 1294 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1295 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1296 attr.registrar_nonce, WPS_NONCE_LEN); 1297 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1298 wps->nonce_r, WPS_NONCE_LEN); 1299 return WPS_FAILURE; 1300 } 1301 1302 if (attr.enrollee_nonce == NULL || 1303 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1304 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1305 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1306 attr.enrollee_nonce, WPS_NONCE_LEN); 1307 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1308 wps->nonce_e, WPS_NONCE_LEN); 1309 return WPS_FAILURE; 1310 } 1311 1312 if (attr.config_error == NULL) { 1313 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1314 "in WSC_NACK"); 1315 return WPS_FAILURE; 1316 } 1317 1318 config_error = WPA_GET_BE16(attr.config_error); 1319 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1320 "Configuration Error %d", config_error); 1321 1322 switch (wps->state) { 1323 case RECV_M4: 1324 wps_fail_event(wps->wps, WPS_M3, config_error, 1325 wps->error_indication); 1326 break; 1327 case RECV_M6: 1328 wps_fail_event(wps->wps, WPS_M5, config_error, 1329 wps->error_indication); 1330 break; 1331 case RECV_M8: 1332 wps_fail_event(wps->wps, WPS_M7, config_error, 1333 wps->error_indication); 1334 break; 1335 default: 1336 break; 1337 } 1338 1339 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1340 * Enrollee is Authenticator */ 1341 wps->state = SEND_WSC_NACK; 1342 1343 return WPS_FAILURE; 1344 } 1345 1346 1347 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1348 enum wsc_op_code op_code, 1349 const struct wpabuf *msg) 1350 { 1351 1352 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1353 "op_code=%d)", 1354 (unsigned long) wpabuf_len(msg), op_code); 1355 1356 if (op_code == WSC_UPnP) { 1357 /* Determine the OpCode based on message type attribute */ 1358 struct wps_parse_attr attr; 1359 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1360 if (*attr.msg_type == WPS_WSC_ACK) 1361 op_code = WSC_ACK; 1362 else if (*attr.msg_type == WPS_WSC_NACK) 1363 op_code = WSC_NACK; 1364 } 1365 } 1366 1367 switch (op_code) { 1368 case WSC_MSG: 1369 case WSC_UPnP: 1370 return wps_process_wsc_msg(wps, msg); 1371 case WSC_ACK: 1372 if (wps_validate_wsc_ack(msg) < 0) 1373 return WPS_FAILURE; 1374 return wps_process_wsc_ack(wps, msg); 1375 case WSC_NACK: 1376 if (wps_validate_wsc_nack(msg) < 0) 1377 return WPS_FAILURE; 1378 return wps_process_wsc_nack(wps, msg); 1379 default: 1380 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1381 return WPS_FAILURE; 1382 } 1383 } 1384
