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 wpabuf_free(wps->dh_pubkey_r); 527 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 528 if (wps->dh_pubkey_r == NULL) 529 return -1; 530 531 if (wps_derive_keys(wps) < 0) 532 return -1; 533 534 return 0; 535 } 536 537 538 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 539 { 540 if (r_hash1 == NULL) { 541 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 542 return -1; 543 } 544 545 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 546 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 547 548 return 0; 549 } 550 551 552 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 553 { 554 if (r_hash2 == NULL) { 555 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 556 return -1; 557 } 558 559 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 560 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 561 562 return 0; 563 } 564 565 566 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 567 { 568 u8 hash[SHA256_MAC_LEN]; 569 const u8 *addr[4]; 570 size_t len[4]; 571 572 if (r_snonce1 == NULL) { 573 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 574 return -1; 575 } 576 577 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 578 WPS_SECRET_NONCE_LEN); 579 580 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 581 addr[0] = r_snonce1; 582 len[0] = WPS_SECRET_NONCE_LEN; 583 addr[1] = wps->psk1; 584 len[1] = WPS_PSK_LEN; 585 addr[2] = wpabuf_head(wps->dh_pubkey_e); 586 len[2] = wpabuf_len(wps->dh_pubkey_e); 587 addr[3] = wpabuf_head(wps->dh_pubkey_r); 588 len[3] = wpabuf_len(wps->dh_pubkey_r); 589 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 590 591 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 592 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 593 "not match with the pre-committed value"); 594 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 595 wps_pwd_auth_fail_event(wps->wps, 1, 1); 596 return -1; 597 } 598 599 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 600 "half of the device password"); 601 602 return 0; 603 } 604 605 606 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 607 { 608 u8 hash[SHA256_MAC_LEN]; 609 const u8 *addr[4]; 610 size_t len[4]; 611 612 if (r_snonce2 == NULL) { 613 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 614 return -1; 615 } 616 617 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 618 WPS_SECRET_NONCE_LEN); 619 620 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 621 addr[0] = r_snonce2; 622 len[0] = WPS_SECRET_NONCE_LEN; 623 addr[1] = wps->psk2; 624 len[1] = WPS_PSK_LEN; 625 addr[2] = wpabuf_head(wps->dh_pubkey_e); 626 len[2] = wpabuf_len(wps->dh_pubkey_e); 627 addr[3] = wpabuf_head(wps->dh_pubkey_r); 628 len[3] = wpabuf_len(wps->dh_pubkey_r); 629 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 630 631 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 632 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 633 "not match with the pre-committed value"); 634 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 635 wps_pwd_auth_fail_event(wps->wps, 1, 2); 636 return -1; 637 } 638 639 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 640 "half of the device password"); 641 642 return 0; 643 } 644 645 646 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 647 size_t cred_len, int wps2) 648 { 649 struct wps_parse_attr attr; 650 struct wpabuf msg; 651 int ret = 0; 652 653 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 654 os_memset(&wps->cred, 0, sizeof(wps->cred)); 655 wpabuf_set(&msg, cred, cred_len); 656 if (wps_parse_msg(&msg, &attr) < 0 || 657 wps_process_cred(&attr, &wps->cred)) 658 return -1; 659 660 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 661 0) { 662 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 663 MACSTR ") does not match with own address (" MACSTR 664 ")", MAC2STR(wps->cred.mac_addr), 665 MAC2STR(wps->wps->dev.mac_addr)); 666 /* 667 * In theory, this could be consider fatal error, but there are 668 * number of deployed implementations using other address here 669 * due to unclarity in the specification. For interoperability 670 * reasons, allow this to be processed since we do not really 671 * use the MAC Address information for anything. 672 */ 673 #ifdef CONFIG_WPS_STRICT 674 if (wps2) { 675 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 676 "MAC Address in AP Settings"); 677 return -1; 678 } 679 #endif /* CONFIG_WPS_STRICT */ 680 } 681 682 #ifdef CONFIG_WPS2 683 if (!(wps->cred.encr_type & 684 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 685 if (wps->cred.encr_type & WPS_ENCR_WEP) { 686 wpa_printf(MSG_INFO, "WPS: Reject Credential " 687 "due to WEP configuration"); 688 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 689 return -2; 690 } 691 692 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 693 "invalid encr_type 0x%x", wps->cred.encr_type); 694 return -1; 695 } 696 #endif /* CONFIG_WPS2 */ 697 698 if (wps->wps->cred_cb) { 699 wps->cred.cred_attr = cred - 4; 700 wps->cred.cred_attr_len = cred_len + 4; 701 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 702 wps->cred.cred_attr = NULL; 703 wps->cred.cred_attr_len = 0; 704 } 705 706 return ret; 707 } 708 709 710 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 711 size_t cred_len[], size_t num_cred, int wps2) 712 { 713 size_t i; 714 int ok = 0; 715 716 if (wps->wps->ap) 717 return 0; 718 719 if (num_cred == 0) { 720 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 721 "received"); 722 return -1; 723 } 724 725 for (i = 0; i < num_cred; i++) { 726 int res; 727 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 728 if (res == 0) 729 ok++; 730 else if (res == -2) 731 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 732 else 733 return -1; 734 } 735 736 if (ok == 0) { 737 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 738 "received"); 739 return -1; 740 } 741 742 return 0; 743 } 744 745 746 static int wps_process_ap_settings_e(struct wps_data *wps, 747 struct wps_parse_attr *attr, 748 struct wpabuf *attrs, int wps2) 749 { 750 struct wps_credential cred; 751 752 if (!wps->wps->ap) 753 return 0; 754 755 if (wps_process_ap_settings(attr, &cred) < 0) 756 return -1; 757 758 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 759 "Registrar"); 760 761 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 762 0) { 763 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 764 MACSTR ") does not match with own address (" MACSTR 765 ")", MAC2STR(cred.mac_addr), 766 MAC2STR(wps->wps->dev.mac_addr)); 767 /* 768 * In theory, this could be consider fatal error, but there are 769 * number of deployed implementations using other address here 770 * due to unclarity in the specification. For interoperability 771 * reasons, allow this to be processed since we do not really 772 * use the MAC Address information for anything. 773 */ 774 #ifdef CONFIG_WPS_STRICT 775 if (wps2) { 776 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 777 "MAC Address in AP Settings"); 778 return -1; 779 } 780 #endif /* CONFIG_WPS_STRICT */ 781 } 782 783 #ifdef CONFIG_WPS2 784 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 785 { 786 if (cred.encr_type & WPS_ENCR_WEP) { 787 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 788 "due to WEP configuration"); 789 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 790 return -1; 791 } 792 793 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 794 "invalid encr_type 0x%x", cred.encr_type); 795 return -1; 796 } 797 #endif /* CONFIG_WPS2 */ 798 799 #ifdef CONFIG_WPS_STRICT 800 if (wps2) { 801 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 802 WPS_ENCR_TKIP || 803 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 804 WPS_AUTH_WPAPSK) { 805 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 806 "AP Settings: WPA-Personal/TKIP only"); 807 wps->error_indication = 808 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 809 return -1; 810 } 811 } 812 #endif /* CONFIG_WPS_STRICT */ 813 814 #ifdef CONFIG_WPS2 815 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 816 { 817 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 818 "TKIP+AES"); 819 cred.encr_type |= WPS_ENCR_AES; 820 } 821 822 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 823 WPS_AUTH_WPAPSK) { 824 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 825 "WPAPSK+WPA2PSK"); 826 cred.auth_type |= WPS_AUTH_WPA2PSK; 827 } 828 #endif /* CONFIG_WPS2 */ 829 830 if (wps->wps->cred_cb) { 831 cred.cred_attr = wpabuf_head(attrs); 832 cred.cred_attr_len = wpabuf_len(attrs); 833 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 834 } 835 836 return 0; 837 } 838 839 840 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 841 { 842 u16 id; 843 844 if (dev_pw_id == NULL) { 845 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 846 return -1; 847 } 848 849 id = WPA_GET_BE16(dev_pw_id); 850 if (wps->dev_pw_id == id) { 851 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 852 return 0; 853 } 854 855 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 856 "ID from %u to %u", wps->dev_pw_id, id); 857 858 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 859 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 860 os_free(wps->dev_password); 861 wps->dev_pw_id = wps->alt_dev_pw_id; 862 wps->dev_password = wps->alt_dev_password; 863 wps->dev_password_len = wps->alt_dev_password_len; 864 wps->alt_dev_password = NULL; 865 wps->alt_dev_password_len = 0; 866 return 0; 867 } 868 869 return -1; 870 } 871 872 873 static enum wps_process_res wps_process_m2(struct wps_data *wps, 874 const struct wpabuf *msg, 875 struct wps_parse_attr *attr) 876 { 877 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 878 879 if (wps->state != RECV_M2) { 880 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 881 "receiving M2", wps->state); 882 wps->state = SEND_WSC_NACK; 883 return WPS_CONTINUE; 884 } 885 886 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 887 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 888 wps_process_uuid_r(wps, attr->uuid_r) || 889 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 890 wps->state = SEND_WSC_NACK; 891 return WPS_CONTINUE; 892 } 893 894 /* 895 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 896 * special locked mode is used to allow protocol run up to M7 in order 897 * to support external Registrars that only learn the current AP 898 * configuration without changing it. 899 */ 900 if (wps->wps->ap && 901 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 902 wps->dev_password == NULL)) { 903 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 904 "registration of a new Registrar"); 905 wps->config_error = WPS_CFG_SETUP_LOCKED; 906 wps->state = SEND_WSC_NACK; 907 return WPS_CONTINUE; 908 } 909 910 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 911 wps_process_authenticator(wps, attr->authenticator, msg) || 912 wps_process_device_attrs(&wps->peer_dev, attr)) { 913 wps->state = SEND_WSC_NACK; 914 return WPS_CONTINUE; 915 } 916 917 wps->state = SEND_M3; 918 return WPS_CONTINUE; 919 } 920 921 922 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 923 struct wps_parse_attr *attr) 924 { 925 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 926 927 if (wps->state != RECV_M2) { 928 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 929 "receiving M2D", wps->state); 930 wps->state = SEND_WSC_NACK; 931 return WPS_CONTINUE; 932 } 933 934 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 935 attr->manufacturer, attr->manufacturer_len); 936 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 937 attr->model_name, attr->model_name_len); 938 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 939 attr->model_number, attr->model_number_len); 940 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 941 attr->serial_number, attr->serial_number_len); 942 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 943 attr->dev_name, attr->dev_name_len); 944 945 if (wps->wps->event_cb) { 946 union wps_event_data data; 947 struct wps_event_m2d *m2d = &data.m2d; 948 os_memset(&data, 0, sizeof(data)); 949 if (attr->config_methods) 950 m2d->config_methods = 951 WPA_GET_BE16(attr->config_methods); 952 m2d->manufacturer = attr->manufacturer; 953 m2d->manufacturer_len = attr->manufacturer_len; 954 m2d->model_name = attr->model_name; 955 m2d->model_name_len = attr->model_name_len; 956 m2d->model_number = attr->model_number; 957 m2d->model_number_len = attr->model_number_len; 958 m2d->serial_number = attr->serial_number; 959 m2d->serial_number_len = attr->serial_number_len; 960 m2d->dev_name = attr->dev_name; 961 m2d->dev_name_len = attr->dev_name_len; 962 m2d->primary_dev_type = attr->primary_dev_type; 963 if (attr->config_error) 964 m2d->config_error = 965 WPA_GET_BE16(attr->config_error); 966 if (attr->dev_password_id) 967 m2d->dev_password_id = 968 WPA_GET_BE16(attr->dev_password_id); 969 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 970 } 971 972 wps->state = RECEIVED_M2D; 973 return WPS_CONTINUE; 974 } 975 976 977 static enum wps_process_res wps_process_m4(struct wps_data *wps, 978 const struct wpabuf *msg, 979 struct wps_parse_attr *attr) 980 { 981 struct wpabuf *decrypted; 982 struct wps_parse_attr eattr; 983 984 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 985 986 if (wps->state != RECV_M4) { 987 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 988 "receiving M4", wps->state); 989 wps->state = SEND_WSC_NACK; 990 return WPS_CONTINUE; 991 } 992 993 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 994 wps_process_authenticator(wps, attr->authenticator, msg) || 995 wps_process_r_hash1(wps, attr->r_hash1) || 996 wps_process_r_hash2(wps, attr->r_hash2)) { 997 wps->state = SEND_WSC_NACK; 998 return WPS_CONTINUE; 999 } 1000 1001 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1002 attr->encr_settings_len); 1003 if (decrypted == NULL) { 1004 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1005 "Settings attribute"); 1006 wps->state = SEND_WSC_NACK; 1007 return WPS_CONTINUE; 1008 } 1009 1010 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1011 wpabuf_free(decrypted); 1012 wps->state = SEND_WSC_NACK; 1013 return WPS_CONTINUE; 1014 } 1015 1016 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1017 "attribute"); 1018 if (wps_parse_msg(decrypted, &eattr) < 0 || 1019 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1020 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1021 wpabuf_free(decrypted); 1022 wps->state = SEND_WSC_NACK; 1023 return WPS_CONTINUE; 1024 } 1025 wpabuf_free(decrypted); 1026 1027 wps->state = SEND_M5; 1028 return WPS_CONTINUE; 1029 } 1030 1031 1032 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1033 const struct wpabuf *msg, 1034 struct wps_parse_attr *attr) 1035 { 1036 struct wpabuf *decrypted; 1037 struct wps_parse_attr eattr; 1038 1039 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1040 1041 if (wps->state != RECV_M6) { 1042 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1043 "receiving M6", wps->state); 1044 wps->state = SEND_WSC_NACK; 1045 return WPS_CONTINUE; 1046 } 1047 1048 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1049 wps_process_authenticator(wps, attr->authenticator, msg)) { 1050 wps->state = SEND_WSC_NACK; 1051 return WPS_CONTINUE; 1052 } 1053 1054 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1055 attr->encr_settings_len); 1056 if (decrypted == NULL) { 1057 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1058 "Settings attribute"); 1059 wps->state = SEND_WSC_NACK; 1060 return WPS_CONTINUE; 1061 } 1062 1063 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1064 wpabuf_free(decrypted); 1065 wps->state = SEND_WSC_NACK; 1066 return WPS_CONTINUE; 1067 } 1068 1069 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1070 "attribute"); 1071 if (wps_parse_msg(decrypted, &eattr) < 0 || 1072 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1073 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1074 wpabuf_free(decrypted); 1075 wps->state = SEND_WSC_NACK; 1076 return WPS_CONTINUE; 1077 } 1078 wpabuf_free(decrypted); 1079 1080 if (wps->wps->ap) 1081 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1082 NULL); 1083 1084 wps->state = SEND_M7; 1085 return WPS_CONTINUE; 1086 } 1087 1088 1089 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1090 const struct wpabuf *msg, 1091 struct wps_parse_attr *attr) 1092 { 1093 struct wpabuf *decrypted; 1094 struct wps_parse_attr eattr; 1095 1096 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1097 1098 if (wps->state != RECV_M8) { 1099 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1100 "receiving M8", wps->state); 1101 wps->state = SEND_WSC_NACK; 1102 return WPS_CONTINUE; 1103 } 1104 1105 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1106 wps_process_authenticator(wps, attr->authenticator, msg)) { 1107 wps->state = SEND_WSC_NACK; 1108 return WPS_CONTINUE; 1109 } 1110 1111 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1112 /* 1113 * Stop here if special ap_setup_locked == 2 mode allowed the 1114 * protocol to continue beyond M2. This allows ER to learn the 1115 * current AP settings without changing them. 1116 */ 1117 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1118 "registration of a new Registrar"); 1119 wps->config_error = WPS_CFG_SETUP_LOCKED; 1120 wps->state = SEND_WSC_NACK; 1121 return WPS_CONTINUE; 1122 } 1123 1124 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1125 attr->encr_settings_len); 1126 if (decrypted == NULL) { 1127 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1128 "Settings attribute"); 1129 wps->state = SEND_WSC_NACK; 1130 return WPS_CONTINUE; 1131 } 1132 1133 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1134 attr->version2 != NULL) < 0) { 1135 wpabuf_free(decrypted); 1136 wps->state = SEND_WSC_NACK; 1137 return WPS_CONTINUE; 1138 } 1139 1140 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1141 "attribute"); 1142 if (wps_parse_msg(decrypted, &eattr) < 0 || 1143 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1144 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1145 eattr.num_cred, attr->version2 != NULL) || 1146 wps_process_ap_settings_e(wps, &eattr, decrypted, 1147 attr->version2 != NULL)) { 1148 wpabuf_free(decrypted); 1149 wps->state = SEND_WSC_NACK; 1150 return WPS_CONTINUE; 1151 } 1152 wpabuf_free(decrypted); 1153 1154 wps->state = WPS_MSG_DONE; 1155 return WPS_CONTINUE; 1156 } 1157 1158 1159 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1160 const struct wpabuf *msg) 1161 { 1162 struct wps_parse_attr attr; 1163 enum wps_process_res ret = WPS_CONTINUE; 1164 1165 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1166 1167 if (wps_parse_msg(msg, &attr) < 0) 1168 return WPS_FAILURE; 1169 1170 if (attr.enrollee_nonce == NULL || 1171 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1172 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1173 return WPS_FAILURE; 1174 } 1175 1176 if (attr.msg_type == NULL) { 1177 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1178 wps->state = SEND_WSC_NACK; 1179 return WPS_CONTINUE; 1180 } 1181 1182 switch (*attr.msg_type) { 1183 case WPS_M2: 1184 if (wps_validate_m2(msg) < 0) 1185 return WPS_FAILURE; 1186 ret = wps_process_m2(wps, msg, &attr); 1187 break; 1188 case WPS_M2D: 1189 if (wps_validate_m2d(msg) < 0) 1190 return WPS_FAILURE; 1191 ret = wps_process_m2d(wps, &attr); 1192 break; 1193 case WPS_M4: 1194 if (wps_validate_m4(msg) < 0) 1195 return WPS_FAILURE; 1196 ret = wps_process_m4(wps, msg, &attr); 1197 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1198 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1199 wps->error_indication); 1200 break; 1201 case WPS_M6: 1202 if (wps_validate_m6(msg) < 0) 1203 return WPS_FAILURE; 1204 ret = wps_process_m6(wps, msg, &attr); 1205 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1206 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1207 wps->error_indication); 1208 break; 1209 case WPS_M8: 1210 if (wps_validate_m8(msg) < 0) 1211 return WPS_FAILURE; 1212 ret = wps_process_m8(wps, msg, &attr); 1213 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1214 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1215 wps->error_indication); 1216 break; 1217 default: 1218 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1219 *attr.msg_type); 1220 return WPS_FAILURE; 1221 } 1222 1223 /* 1224 * Save a copy of the last message for Authenticator derivation if we 1225 * are continuing. However, skip M2D since it is not authenticated and 1226 * neither is the ACK/NACK response frame. This allows the possibly 1227 * following M2 to be processed correctly by using the previously sent 1228 * M1 in Authenticator derivation. 1229 */ 1230 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1231 /* Save a copy of the last message for Authenticator derivation 1232 */ 1233 wpabuf_free(wps->last_msg); 1234 wps->last_msg = wpabuf_dup(msg); 1235 } 1236 1237 return ret; 1238 } 1239 1240 1241 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1242 const struct wpabuf *msg) 1243 { 1244 struct wps_parse_attr attr; 1245 1246 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1247 1248 if (wps_parse_msg(msg, &attr) < 0) 1249 return WPS_FAILURE; 1250 1251 if (attr.msg_type == NULL) { 1252 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1253 return WPS_FAILURE; 1254 } 1255 1256 if (*attr.msg_type != WPS_WSC_ACK) { 1257 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1258 *attr.msg_type); 1259 return WPS_FAILURE; 1260 } 1261 1262 if (attr.registrar_nonce == NULL || 1263 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1264 { 1265 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1266 return WPS_FAILURE; 1267 } 1268 1269 if (attr.enrollee_nonce == NULL || 1270 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1271 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1272 return WPS_FAILURE; 1273 } 1274 1275 if (wps->state == RECV_ACK && wps->wps->ap) { 1276 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1277 "completed successfully"); 1278 wps_success_event(wps->wps); 1279 wps->state = WPS_FINISHED; 1280 return WPS_DONE; 1281 } 1282 1283 return WPS_FAILURE; 1284 } 1285 1286 1287 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1288 const struct wpabuf *msg) 1289 { 1290 struct wps_parse_attr attr; 1291 u16 config_error; 1292 1293 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1294 1295 if (wps_parse_msg(msg, &attr) < 0) 1296 return WPS_FAILURE; 1297 1298 if (attr.msg_type == NULL) { 1299 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1300 return WPS_FAILURE; 1301 } 1302 1303 if (*attr.msg_type != WPS_WSC_NACK) { 1304 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1305 *attr.msg_type); 1306 return WPS_FAILURE; 1307 } 1308 1309 if (attr.registrar_nonce == NULL || 1310 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1311 { 1312 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1313 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1314 attr.registrar_nonce, WPS_NONCE_LEN); 1315 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1316 wps->nonce_r, WPS_NONCE_LEN); 1317 return WPS_FAILURE; 1318 } 1319 1320 if (attr.enrollee_nonce == NULL || 1321 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1322 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1323 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1324 attr.enrollee_nonce, WPS_NONCE_LEN); 1325 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1326 wps->nonce_e, WPS_NONCE_LEN); 1327 return WPS_FAILURE; 1328 } 1329 1330 if (attr.config_error == NULL) { 1331 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1332 "in WSC_NACK"); 1333 return WPS_FAILURE; 1334 } 1335 1336 config_error = WPA_GET_BE16(attr.config_error); 1337 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1338 "Configuration Error %d", config_error); 1339 1340 switch (wps->state) { 1341 case RECV_M4: 1342 wps_fail_event(wps->wps, WPS_M3, config_error, 1343 wps->error_indication); 1344 break; 1345 case RECV_M6: 1346 wps_fail_event(wps->wps, WPS_M5, config_error, 1347 wps->error_indication); 1348 break; 1349 case RECV_M8: 1350 wps_fail_event(wps->wps, WPS_M7, config_error, 1351 wps->error_indication); 1352 break; 1353 default: 1354 break; 1355 } 1356 1357 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1358 * Enrollee is Authenticator */ 1359 wps->state = SEND_WSC_NACK; 1360 1361 return WPS_FAILURE; 1362 } 1363 1364 1365 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1366 enum wsc_op_code op_code, 1367 const struct wpabuf *msg) 1368 { 1369 1370 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1371 "op_code=%d)", 1372 (unsigned long) wpabuf_len(msg), op_code); 1373 1374 if (op_code == WSC_UPnP) { 1375 /* Determine the OpCode based on message type attribute */ 1376 struct wps_parse_attr attr; 1377 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1378 if (*attr.msg_type == WPS_WSC_ACK) 1379 op_code = WSC_ACK; 1380 else if (*attr.msg_type == WPS_WSC_NACK) 1381 op_code = WSC_NACK; 1382 } 1383 } 1384 1385 switch (op_code) { 1386 case WSC_MSG: 1387 case WSC_UPnP: 1388 return wps_process_wsc_msg(wps, msg); 1389 case WSC_ACK: 1390 if (wps_validate_wsc_ack(msg) < 0) 1391 return WPS_FAILURE; 1392 return wps_process_wsc_ack(wps, msg); 1393 case WSC_NACK: 1394 if (wps_validate_wsc_nack(msg) < 0) 1395 return WPS_FAILURE; 1396 return wps_process_wsc_nack(wps, msg); 1397 default: 1398 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1399 return WPS_FAILURE; 1400 } 1401 } 1402
