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_wps_state(struct wps_data *wps, struct wpabuf *msg) 20 { 21 u8 state; 22 if (wps->wps->ap) 23 state = wps->wps->wps_state; 24 else 25 state = WPS_STATE_NOT_CONFIGURED; 26 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 27 state); 28 wpabuf_put_be16(msg, ATTR_WPS_STATE); 29 wpabuf_put_be16(msg, 1); 30 wpabuf_put_u8(msg, state); 31 return 0; 32 } 33 34 35 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 36 { 37 u8 *hash; 38 const u8 *addr[4]; 39 size_t len[4]; 40 41 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 42 return -1; 43 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 44 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 45 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 46 47 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 48 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 49 "E-Hash derivation"); 50 return -1; 51 } 52 53 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 54 wpabuf_put_be16(msg, ATTR_E_HASH1); 55 wpabuf_put_be16(msg, SHA256_MAC_LEN); 56 hash = wpabuf_put(msg, SHA256_MAC_LEN); 57 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 58 addr[0] = wps->snonce; 59 len[0] = WPS_SECRET_NONCE_LEN; 60 addr[1] = wps->psk1; 61 len[1] = WPS_PSK_LEN; 62 addr[2] = wpabuf_head(wps->dh_pubkey_e); 63 len[2] = wpabuf_len(wps->dh_pubkey_e); 64 addr[3] = wpabuf_head(wps->dh_pubkey_r); 65 len[3] = wpabuf_len(wps->dh_pubkey_r); 66 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 67 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 70 wpabuf_put_be16(msg, ATTR_E_HASH2); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 74 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 75 addr[1] = wps->psk2; 76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 78 79 return 0; 80 } 81 82 83 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 84 { 85 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 86 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 87 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 88 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 89 return 0; 90 } 91 92 93 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 94 { 95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 96 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 99 WPS_SECRET_NONCE_LEN); 100 return 0; 101 } 102 103 104 static struct wpabuf * wps_build_m1(struct wps_data *wps) 105 { 106 struct wpabuf *msg; 107 u16 config_methods; 108 109 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 110 return NULL; 111 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 112 wps->nonce_e, WPS_NONCE_LEN); 113 114 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 115 msg = wpabuf_alloc(1000); 116 if (msg == NULL) 117 return NULL; 118 119 config_methods = wps->wps->config_methods; 120 if (wps->wps->ap && !wps->pbc_in_m1 && 121 (wps->dev_password_len != 0 || 122 (config_methods & WPS_CONFIG_DISPLAY))) { 123 /* 124 * These are the methods that the AP supports as an Enrollee 125 * for adding external Registrars, so remove PushButton. 126 * 127 * As a workaround for Windows 7 mechanism for probing WPS 128 * capabilities from M1, leave PushButton option if no PIN 129 * method is available or if WPS configuration enables PBC 130 * workaround. 131 */ 132 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 133 #ifdef CONFIG_WPS2 134 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 135 WPS_CONFIG_PHY_PUSHBUTTON); 136 #endif /* CONFIG_WPS2 */ 137 } 138 139 if (wps_build_version(msg) || 140 wps_build_msg_type(msg, WPS_M1) || 141 wps_build_uuid_e(msg, wps->uuid_e) || 142 wps_build_mac_addr(msg, wps->mac_addr_e) || 143 wps_build_enrollee_nonce(wps, msg) || 144 wps_build_public_key(wps, msg) || 145 wps_build_auth_type_flags(wps, msg) || 146 wps_build_encr_type_flags(wps, msg) || 147 wps_build_conn_type_flags(wps, msg) || 148 wps_build_config_methods(msg, config_methods) || 149 wps_build_wps_state(wps, msg) || 150 wps_build_device_attrs(&wps->wps->dev, msg) || 151 wps_build_rf_bands(&wps->wps->dev, msg, 152 wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 153 wps_build_assoc_state(wps, msg) || 154 wps_build_dev_password_id(msg, wps->dev_pw_id) || 155 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 156 wps_build_os_version(&wps->wps->dev, msg) || 157 wps_build_wfa_ext(msg, 0, NULL, 0) || 158 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 159 wpabuf_free(msg); 160 return NULL; 161 } 162 163 wps->state = RECV_M2; 164 return msg; 165 } 166 167 168 static struct wpabuf * wps_build_m3(struct wps_data *wps) 169 { 170 struct wpabuf *msg; 171 172 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 173 174 if (wps->dev_password == NULL) { 175 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 176 return NULL; 177 } 178 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 179 180 msg = wpabuf_alloc(1000); 181 if (msg == NULL) 182 return NULL; 183 184 if (wps_build_version(msg) || 185 wps_build_msg_type(msg, WPS_M3) || 186 wps_build_registrar_nonce(wps, msg) || 187 wps_build_e_hash(wps, msg) || 188 wps_build_wfa_ext(msg, 0, NULL, 0) || 189 wps_build_authenticator(wps, msg)) { 190 wpabuf_free(msg); 191 return NULL; 192 } 193 194 wps->state = RECV_M4; 195 return msg; 196 } 197 198 199 static struct wpabuf * wps_build_m5(struct wps_data *wps) 200 { 201 struct wpabuf *msg, *plain; 202 203 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 204 205 plain = wpabuf_alloc(200); 206 if (plain == NULL) 207 return NULL; 208 209 msg = wpabuf_alloc(1000); 210 if (msg == NULL) { 211 wpabuf_free(plain); 212 return NULL; 213 } 214 215 if (wps_build_version(msg) || 216 wps_build_msg_type(msg, WPS_M5) || 217 wps_build_registrar_nonce(wps, msg) || 218 wps_build_e_snonce1(wps, plain) || 219 wps_build_key_wrap_auth(wps, plain) || 220 wps_build_encr_settings(wps, msg, plain) || 221 wps_build_wfa_ext(msg, 0, NULL, 0) || 222 wps_build_authenticator(wps, msg)) { 223 wpabuf_free(plain); 224 wpabuf_free(msg); 225 return NULL; 226 } 227 wpabuf_free(plain); 228 229 wps->state = RECV_M6; 230 return msg; 231 } 232 233 234 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 235 { 236 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 237 wpabuf_put_be16(msg, ATTR_SSID); 238 wpabuf_put_be16(msg, wps->wps->ssid_len); 239 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 240 return 0; 241 } 242 243 244 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 245 { 246 u16 auth_type = wps->wps->auth_types; 247 248 /* Select the best authentication type */ 249 if (auth_type & WPS_AUTH_WPA2PSK) 250 auth_type = WPS_AUTH_WPA2PSK; 251 else if (auth_type & WPS_AUTH_WPAPSK) 252 auth_type = WPS_AUTH_WPAPSK; 253 else if (auth_type & WPS_AUTH_OPEN) 254 auth_type = WPS_AUTH_OPEN; 255 else if (auth_type & WPS_AUTH_SHARED) 256 auth_type = WPS_AUTH_SHARED; 257 258 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 259 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 260 wpabuf_put_be16(msg, 2); 261 wpabuf_put_be16(msg, auth_type); 262 return 0; 263 } 264 265 266 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 267 { 268 u16 encr_type = wps->wps->encr_types; 269 270 /* Select the best encryption type */ 271 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 272 if (encr_type & WPS_ENCR_AES) 273 encr_type = WPS_ENCR_AES; 274 else if (encr_type & WPS_ENCR_TKIP) 275 encr_type = WPS_ENCR_TKIP; 276 } else { 277 if (encr_type & WPS_ENCR_WEP) 278 encr_type = WPS_ENCR_WEP; 279 else if (encr_type & WPS_ENCR_NONE) 280 encr_type = WPS_ENCR_NONE; 281 } 282 283 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 284 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 285 wpabuf_put_be16(msg, 2); 286 wpabuf_put_be16(msg, encr_type); 287 return 0; 288 } 289 290 291 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 292 { 293 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 294 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 295 wpabuf_put_be16(msg, wps->wps->network_key_len); 296 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 297 return 0; 298 } 299 300 301 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 302 { 303 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 304 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 305 wpabuf_put_be16(msg, ETH_ALEN); 306 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 307 return 0; 308 } 309 310 311 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 312 { 313 if (wps->wps->ap_settings) { 314 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 315 wpabuf_put_data(plain, wps->wps->ap_settings, 316 wps->wps->ap_settings_len); 317 return 0; 318 } 319 320 return wps_build_cred_ssid(wps, plain) || 321 wps_build_cred_mac_addr(wps, plain) || 322 wps_build_cred_auth_type(wps, plain) || 323 wps_build_cred_encr_type(wps, plain) || 324 wps_build_cred_network_key(wps, plain); 325 } 326 327 328 static struct wpabuf * wps_build_m7(struct wps_data *wps) 329 { 330 struct wpabuf *msg, *plain; 331 332 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 333 334 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 335 if (plain == NULL) 336 return NULL; 337 338 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 339 if (msg == NULL) { 340 wpabuf_free(plain); 341 return NULL; 342 } 343 344 if (wps_build_version(msg) || 345 wps_build_msg_type(msg, WPS_M7) || 346 wps_build_registrar_nonce(wps, msg) || 347 wps_build_e_snonce2(wps, plain) || 348 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 349 wps_build_key_wrap_auth(wps, plain) || 350 wps_build_encr_settings(wps, msg, plain) || 351 wps_build_wfa_ext(msg, 0, NULL, 0) || 352 wps_build_authenticator(wps, msg)) { 353 wpabuf_free(plain); 354 wpabuf_free(msg); 355 return NULL; 356 } 357 wpabuf_free(plain); 358 359 if (wps->wps->ap && wps->wps->registrar) { 360 /* 361 * If the Registrar is only learning our current configuration, 362 * it may not continue protocol run to successful completion. 363 * Store information here to make sure it remains available. 364 */ 365 wps_device_store(wps->wps->registrar, &wps->peer_dev, 366 wps->uuid_r); 367 } 368 369 wps->state = RECV_M8; 370 return msg; 371 } 372 373 374 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 375 { 376 struct wpabuf *msg; 377 378 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 379 380 msg = wpabuf_alloc(1000); 381 if (msg == NULL) 382 return NULL; 383 384 if (wps_build_version(msg) || 385 wps_build_msg_type(msg, WPS_WSC_DONE) || 386 wps_build_enrollee_nonce(wps, msg) || 387 wps_build_registrar_nonce(wps, msg) || 388 wps_build_wfa_ext(msg, 0, NULL, 0)) { 389 wpabuf_free(msg); 390 return NULL; 391 } 392 393 if (wps->wps->ap) 394 wps->state = RECV_ACK; 395 else { 396 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 397 wps->state = WPS_FINISHED; 398 } 399 return msg; 400 } 401 402 403 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 404 enum wsc_op_code *op_code) 405 { 406 struct wpabuf *msg; 407 408 switch (wps->state) { 409 case SEND_M1: 410 msg = wps_build_m1(wps); 411 *op_code = WSC_MSG; 412 break; 413 case SEND_M3: 414 msg = wps_build_m3(wps); 415 *op_code = WSC_MSG; 416 break; 417 case SEND_M5: 418 msg = wps_build_m5(wps); 419 *op_code = WSC_MSG; 420 break; 421 case SEND_M7: 422 msg = wps_build_m7(wps); 423 *op_code = WSC_MSG; 424 break; 425 case RECEIVED_M2D: 426 if (wps->wps->ap) { 427 msg = wps_build_wsc_nack(wps); 428 *op_code = WSC_NACK; 429 break; 430 } 431 msg = wps_build_wsc_ack(wps); 432 *op_code = WSC_ACK; 433 if (msg) { 434 /* Another M2/M2D may be received */ 435 wps->state = RECV_M2; 436 } 437 break; 438 case SEND_WSC_NACK: 439 msg = wps_build_wsc_nack(wps); 440 *op_code = WSC_NACK; 441 break; 442 case WPS_MSG_DONE: 443 msg = wps_build_wsc_done(wps); 444 *op_code = WSC_Done; 445 break; 446 default: 447 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 448 "a message", wps->state); 449 msg = NULL; 450 break; 451 } 452 453 if (*op_code == WSC_MSG && msg) { 454 /* Save a copy of the last message for Authenticator derivation 455 */ 456 wpabuf_free(wps->last_msg); 457 wps->last_msg = wpabuf_dup(msg); 458 } 459 460 return msg; 461 } 462 463 464 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 465 { 466 if (r_nonce == NULL) { 467 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 468 return -1; 469 } 470 471 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 472 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 473 wps->nonce_r, WPS_NONCE_LEN); 474 475 return 0; 476 } 477 478 479 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 480 { 481 if (e_nonce == NULL) { 482 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 483 return -1; 484 } 485 486 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 487 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 488 return -1; 489 } 490 491 return 0; 492 } 493 494 495 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 496 { 497 if (uuid_r == NULL) { 498 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 499 return -1; 500 } 501 502 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 503 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 504 505 return 0; 506 } 507 508 509 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 510 size_t pk_len) 511 { 512 if (pk == NULL || pk_len == 0) { 513 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 514 return -1; 515 } 516 517 wpabuf_free(wps->dh_pubkey_r); 518 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 519 if (wps->dh_pubkey_r == NULL) 520 return -1; 521 522 if (wps_derive_keys(wps) < 0) 523 return -1; 524 525 return 0; 526 } 527 528 529 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 530 { 531 if (r_hash1 == NULL) { 532 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 533 return -1; 534 } 535 536 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 537 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 538 539 return 0; 540 } 541 542 543 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 544 { 545 if (r_hash2 == NULL) { 546 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 547 return -1; 548 } 549 550 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 551 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 552 553 return 0; 554 } 555 556 557 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 558 { 559 u8 hash[SHA256_MAC_LEN]; 560 const u8 *addr[4]; 561 size_t len[4]; 562 563 if (r_snonce1 == NULL) { 564 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 565 return -1; 566 } 567 568 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 569 WPS_SECRET_NONCE_LEN); 570 571 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 572 addr[0] = r_snonce1; 573 len[0] = WPS_SECRET_NONCE_LEN; 574 addr[1] = wps->psk1; 575 len[1] = WPS_PSK_LEN; 576 addr[2] = wpabuf_head(wps->dh_pubkey_e); 577 len[2] = wpabuf_len(wps->dh_pubkey_e); 578 addr[3] = wpabuf_head(wps->dh_pubkey_r); 579 len[3] = wpabuf_len(wps->dh_pubkey_r); 580 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 581 582 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 583 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 584 "not match with the pre-committed value"); 585 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 586 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 587 return -1; 588 } 589 590 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 591 "half of the device password"); 592 593 return 0; 594 } 595 596 597 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 598 { 599 u8 hash[SHA256_MAC_LEN]; 600 const u8 *addr[4]; 601 size_t len[4]; 602 603 if (r_snonce2 == NULL) { 604 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 605 return -1; 606 } 607 608 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 609 WPS_SECRET_NONCE_LEN); 610 611 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 612 addr[0] = r_snonce2; 613 len[0] = WPS_SECRET_NONCE_LEN; 614 addr[1] = wps->psk2; 615 len[1] = WPS_PSK_LEN; 616 addr[2] = wpabuf_head(wps->dh_pubkey_e); 617 len[2] = wpabuf_len(wps->dh_pubkey_e); 618 addr[3] = wpabuf_head(wps->dh_pubkey_r); 619 len[3] = wpabuf_len(wps->dh_pubkey_r); 620 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 621 622 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 623 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 624 "not match with the pre-committed value"); 625 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 626 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 627 return -1; 628 } 629 630 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 631 "half of the device password"); 632 633 return 0; 634 } 635 636 637 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 638 size_t cred_len, int wps2) 639 { 640 struct wps_parse_attr attr; 641 struct wpabuf msg; 642 int ret = 0; 643 644 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 645 os_memset(&wps->cred, 0, sizeof(wps->cred)); 646 wpabuf_set(&msg, cred, cred_len); 647 if (wps_parse_msg(&msg, &attr) < 0 || 648 wps_process_cred(&attr, &wps->cred)) 649 return -1; 650 651 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 652 0) { 653 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 654 MACSTR ") does not match with own address (" MACSTR 655 ")", MAC2STR(wps->cred.mac_addr), 656 MAC2STR(wps->wps->dev.mac_addr)); 657 /* 658 * In theory, this could be consider fatal error, but there are 659 * number of deployed implementations using other address here 660 * due to unclarity in the specification. For interoperability 661 * reasons, allow this to be processed since we do not really 662 * use the MAC Address information for anything. 663 */ 664 #ifdef CONFIG_WPS_STRICT 665 if (wps2) { 666 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 667 "MAC Address in AP Settings"); 668 return -1; 669 } 670 #endif /* CONFIG_WPS_STRICT */ 671 } 672 673 #ifdef CONFIG_WPS2 674 if (!(wps->cred.encr_type & 675 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 676 if (wps->cred.encr_type & WPS_ENCR_WEP) { 677 wpa_printf(MSG_INFO, "WPS: Reject Credential " 678 "due to WEP configuration"); 679 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 680 return -2; 681 } 682 683 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 684 "invalid encr_type 0x%x", wps->cred.encr_type); 685 return -1; 686 } 687 #endif /* CONFIG_WPS2 */ 688 689 if (wps->wps->cred_cb) { 690 wps->cred.cred_attr = cred - 4; 691 wps->cred.cred_attr_len = cred_len + 4; 692 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 693 wps->cred.cred_attr = NULL; 694 wps->cred.cred_attr_len = 0; 695 } 696 697 return ret; 698 } 699 700 701 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 702 size_t cred_len[], size_t num_cred, int wps2) 703 { 704 size_t i; 705 int ok = 0; 706 707 if (wps->wps->ap) 708 return 0; 709 710 if (num_cred == 0) { 711 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 712 "received"); 713 return -1; 714 } 715 716 for (i = 0; i < num_cred; i++) { 717 int res; 718 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 719 if (res == 0) 720 ok++; 721 else if (res == -2) 722 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 723 else 724 return -1; 725 } 726 727 if (ok == 0) { 728 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 729 "received"); 730 return -1; 731 } 732 733 return 0; 734 } 735 736 737 static int wps_process_ap_settings_e(struct wps_data *wps, 738 struct wps_parse_attr *attr, 739 struct wpabuf *attrs, int wps2) 740 { 741 struct wps_credential cred; 742 743 if (!wps->wps->ap) 744 return 0; 745 746 if (wps_process_ap_settings(attr, &cred) < 0) 747 return -1; 748 749 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 750 "Registrar"); 751 752 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 753 0) { 754 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 755 MACSTR ") does not match with own address (" MACSTR 756 ")", MAC2STR(cred.mac_addr), 757 MAC2STR(wps->wps->dev.mac_addr)); 758 /* 759 * In theory, this could be consider fatal error, but there are 760 * number of deployed implementations using other address here 761 * due to unclarity in the specification. For interoperability 762 * reasons, allow this to be processed since we do not really 763 * use the MAC Address information for anything. 764 */ 765 #ifdef CONFIG_WPS_STRICT 766 if (wps2) { 767 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 768 "MAC Address in AP Settings"); 769 return -1; 770 } 771 #endif /* CONFIG_WPS_STRICT */ 772 } 773 774 #ifdef CONFIG_WPS2 775 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 776 { 777 if (cred.encr_type & WPS_ENCR_WEP) { 778 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 779 "due to WEP configuration"); 780 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 781 return -1; 782 } 783 784 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 785 "invalid encr_type 0x%x", cred.encr_type); 786 return -1; 787 } 788 #endif /* CONFIG_WPS2 */ 789 790 #ifdef CONFIG_WPS_STRICT 791 if (wps2) { 792 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 793 WPS_ENCR_TKIP || 794 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 795 WPS_AUTH_WPAPSK) { 796 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 797 "AP Settings: WPA-Personal/TKIP only"); 798 wps->error_indication = 799 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 800 return -1; 801 } 802 } 803 #endif /* CONFIG_WPS_STRICT */ 804 805 #ifdef CONFIG_WPS2 806 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 807 { 808 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 809 "TKIP+AES"); 810 cred.encr_type |= WPS_ENCR_AES; 811 } 812 813 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 814 WPS_AUTH_WPAPSK) { 815 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 816 "WPAPSK+WPA2PSK"); 817 cred.auth_type |= WPS_AUTH_WPA2PSK; 818 } 819 #endif /* CONFIG_WPS2 */ 820 821 if (wps->wps->cred_cb) { 822 cred.cred_attr = wpabuf_head(attrs); 823 cred.cred_attr_len = wpabuf_len(attrs); 824 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 825 } 826 827 return 0; 828 } 829 830 831 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 832 { 833 u16 id; 834 835 if (dev_pw_id == NULL) { 836 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 837 return -1; 838 } 839 840 id = WPA_GET_BE16(dev_pw_id); 841 if (wps->dev_pw_id == id) { 842 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 843 return 0; 844 } 845 846 #ifdef CONFIG_P2P 847 if ((id == DEV_PW_DEFAULT && 848 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 849 (id == DEV_PW_REGISTRAR_SPECIFIED && 850 wps->dev_pw_id == DEV_PW_DEFAULT)) { 851 /* 852 * Common P2P use cases indicate whether the PIN is from the 853 * client or GO using Device Password Id in M1/M2 in a way that 854 * does not look fully compliant with WSC specification. Anyway, 855 * this is deployed and needs to be allowed, so ignore changes 856 * between Registrar-Specified and Default PIN. 857 */ 858 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 859 "change"); 860 return 0; 861 } 862 #endif /* CONFIG_P2P */ 863 864 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 865 "ID from %u to %u", wps->dev_pw_id, id); 866 867 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 868 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 869 os_free(wps->dev_password); 870 wps->dev_pw_id = wps->alt_dev_pw_id; 871 wps->dev_password = wps->alt_dev_password; 872 wps->dev_password_len = wps->alt_dev_password_len; 873 wps->alt_dev_password = NULL; 874 wps->alt_dev_password_len = 0; 875 return 0; 876 } 877 878 return -1; 879 } 880 881 882 static enum wps_process_res wps_process_m2(struct wps_data *wps, 883 const struct wpabuf *msg, 884 struct wps_parse_attr *attr) 885 { 886 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 887 888 if (wps->state != RECV_M2) { 889 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 890 "receiving M2", wps->state); 891 wps->state = SEND_WSC_NACK; 892 return WPS_CONTINUE; 893 } 894 895 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 896 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 897 wps_process_uuid_r(wps, attr->uuid_r) || 898 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 899 wps->state = SEND_WSC_NACK; 900 return WPS_CONTINUE; 901 } 902 903 /* 904 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 905 * special locked mode is used to allow protocol run up to M7 in order 906 * to support external Registrars that only learn the current AP 907 * configuration without changing it. 908 */ 909 if (wps->wps->ap && 910 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 911 wps->dev_password == NULL)) { 912 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 913 "registration of a new Registrar"); 914 wps->config_error = WPS_CFG_SETUP_LOCKED; 915 wps->state = SEND_WSC_NACK; 916 return WPS_CONTINUE; 917 } 918 919 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 920 wps_process_authenticator(wps, attr->authenticator, msg) || 921 wps_process_device_attrs(&wps->peer_dev, attr)) { 922 wps->state = SEND_WSC_NACK; 923 return WPS_CONTINUE; 924 } 925 926 wps->state = SEND_M3; 927 return WPS_CONTINUE; 928 } 929 930 931 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 932 struct wps_parse_attr *attr) 933 { 934 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 935 936 if (wps->state != RECV_M2) { 937 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 938 "receiving M2D", wps->state); 939 wps->state = SEND_WSC_NACK; 940 return WPS_CONTINUE; 941 } 942 943 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 944 attr->manufacturer, attr->manufacturer_len); 945 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 946 attr->model_name, attr->model_name_len); 947 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 948 attr->model_number, attr->model_number_len); 949 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 950 attr->serial_number, attr->serial_number_len); 951 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 952 attr->dev_name, attr->dev_name_len); 953 954 if (wps->wps->event_cb) { 955 union wps_event_data data; 956 struct wps_event_m2d *m2d = &data.m2d; 957 os_memset(&data, 0, sizeof(data)); 958 if (attr->config_methods) 959 m2d->config_methods = 960 WPA_GET_BE16(attr->config_methods); 961 m2d->manufacturer = attr->manufacturer; 962 m2d->manufacturer_len = attr->manufacturer_len; 963 m2d->model_name = attr->model_name; 964 m2d->model_name_len = attr->model_name_len; 965 m2d->model_number = attr->model_number; 966 m2d->model_number_len = attr->model_number_len; 967 m2d->serial_number = attr->serial_number; 968 m2d->serial_number_len = attr->serial_number_len; 969 m2d->dev_name = attr->dev_name; 970 m2d->dev_name_len = attr->dev_name_len; 971 m2d->primary_dev_type = attr->primary_dev_type; 972 if (attr->config_error) 973 m2d->config_error = 974 WPA_GET_BE16(attr->config_error); 975 if (attr->dev_password_id) 976 m2d->dev_password_id = 977 WPA_GET_BE16(attr->dev_password_id); 978 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 979 } 980 981 wps->state = RECEIVED_M2D; 982 return WPS_CONTINUE; 983 } 984 985 986 static enum wps_process_res wps_process_m4(struct wps_data *wps, 987 const struct wpabuf *msg, 988 struct wps_parse_attr *attr) 989 { 990 struct wpabuf *decrypted; 991 struct wps_parse_attr eattr; 992 993 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 994 995 if (wps->state != RECV_M4) { 996 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 997 "receiving M4", wps->state); 998 wps->state = SEND_WSC_NACK; 999 return WPS_CONTINUE; 1000 } 1001 1002 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1003 wps_process_authenticator(wps, attr->authenticator, msg) || 1004 wps_process_r_hash1(wps, attr->r_hash1) || 1005 wps_process_r_hash2(wps, attr->r_hash2)) { 1006 wps->state = SEND_WSC_NACK; 1007 return WPS_CONTINUE; 1008 } 1009 1010 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1011 attr->encr_settings_len); 1012 if (decrypted == NULL) { 1013 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1014 "Settings attribute"); 1015 wps->state = SEND_WSC_NACK; 1016 return WPS_CONTINUE; 1017 } 1018 1019 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1020 wpabuf_free(decrypted); 1021 wps->state = SEND_WSC_NACK; 1022 return WPS_CONTINUE; 1023 } 1024 1025 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1026 "attribute"); 1027 if (wps_parse_msg(decrypted, &eattr) < 0 || 1028 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1029 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1030 wpabuf_free(decrypted); 1031 wps->state = SEND_WSC_NACK; 1032 return WPS_CONTINUE; 1033 } 1034 wpabuf_free(decrypted); 1035 1036 wps->state = SEND_M5; 1037 return WPS_CONTINUE; 1038 } 1039 1040 1041 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1042 const struct wpabuf *msg, 1043 struct wps_parse_attr *attr) 1044 { 1045 struct wpabuf *decrypted; 1046 struct wps_parse_attr eattr; 1047 1048 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1049 1050 if (wps->state != RECV_M6) { 1051 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1052 "receiving M6", wps->state); 1053 wps->state = SEND_WSC_NACK; 1054 return WPS_CONTINUE; 1055 } 1056 1057 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1058 wps_process_authenticator(wps, attr->authenticator, msg)) { 1059 wps->state = SEND_WSC_NACK; 1060 return WPS_CONTINUE; 1061 } 1062 1063 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1064 attr->encr_settings_len); 1065 if (decrypted == NULL) { 1066 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1067 "Settings attribute"); 1068 wps->state = SEND_WSC_NACK; 1069 return WPS_CONTINUE; 1070 } 1071 1072 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1073 wpabuf_free(decrypted); 1074 wps->state = SEND_WSC_NACK; 1075 return WPS_CONTINUE; 1076 } 1077 1078 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1079 "attribute"); 1080 if (wps_parse_msg(decrypted, &eattr) < 0 || 1081 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1082 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1083 wpabuf_free(decrypted); 1084 wps->state = SEND_WSC_NACK; 1085 return WPS_CONTINUE; 1086 } 1087 wpabuf_free(decrypted); 1088 1089 if (wps->wps->ap) 1090 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1091 NULL); 1092 1093 wps->state = SEND_M7; 1094 return WPS_CONTINUE; 1095 } 1096 1097 1098 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1099 const struct wpabuf *msg, 1100 struct wps_parse_attr *attr) 1101 { 1102 struct wpabuf *decrypted; 1103 struct wps_parse_attr eattr; 1104 1105 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1106 1107 if (wps->state != RECV_M8) { 1108 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1109 "receiving M8", wps->state); 1110 wps->state = SEND_WSC_NACK; 1111 return WPS_CONTINUE; 1112 } 1113 1114 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1115 wps_process_authenticator(wps, attr->authenticator, msg)) { 1116 wps->state = SEND_WSC_NACK; 1117 return WPS_CONTINUE; 1118 } 1119 1120 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1121 /* 1122 * Stop here if special ap_setup_locked == 2 mode allowed the 1123 * protocol to continue beyond M2. This allows ER to learn the 1124 * current AP settings without changing them. 1125 */ 1126 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1127 "registration of a new Registrar"); 1128 wps->config_error = WPS_CFG_SETUP_LOCKED; 1129 wps->state = SEND_WSC_NACK; 1130 return WPS_CONTINUE; 1131 } 1132 1133 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1134 attr->encr_settings_len); 1135 if (decrypted == NULL) { 1136 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1137 "Settings attribute"); 1138 wps->state = SEND_WSC_NACK; 1139 return WPS_CONTINUE; 1140 } 1141 1142 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1143 attr->version2 != NULL) < 0) { 1144 wpabuf_free(decrypted); 1145 wps->state = SEND_WSC_NACK; 1146 return WPS_CONTINUE; 1147 } 1148 1149 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1150 "attribute"); 1151 if (wps_parse_msg(decrypted, &eattr) < 0 || 1152 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1153 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1154 eattr.num_cred, attr->version2 != NULL) || 1155 wps_process_ap_settings_e(wps, &eattr, decrypted, 1156 attr->version2 != NULL)) { 1157 wpabuf_free(decrypted); 1158 wps->state = SEND_WSC_NACK; 1159 return WPS_CONTINUE; 1160 } 1161 wpabuf_free(decrypted); 1162 1163 wps->state = WPS_MSG_DONE; 1164 return WPS_CONTINUE; 1165 } 1166 1167 1168 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1169 const struct wpabuf *msg) 1170 { 1171 struct wps_parse_attr attr; 1172 enum wps_process_res ret = WPS_CONTINUE; 1173 1174 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1175 1176 if (wps_parse_msg(msg, &attr) < 0) 1177 return WPS_FAILURE; 1178 1179 if (attr.enrollee_nonce == NULL || 1180 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1181 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1182 return WPS_FAILURE; 1183 } 1184 1185 if (attr.msg_type == NULL) { 1186 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1187 wps->state = SEND_WSC_NACK; 1188 return WPS_CONTINUE; 1189 } 1190 1191 switch (*attr.msg_type) { 1192 case WPS_M2: 1193 if (wps_validate_m2(msg) < 0) 1194 return WPS_FAILURE; 1195 ret = wps_process_m2(wps, msg, &attr); 1196 break; 1197 case WPS_M2D: 1198 if (wps_validate_m2d(msg) < 0) 1199 return WPS_FAILURE; 1200 ret = wps_process_m2d(wps, &attr); 1201 break; 1202 case WPS_M4: 1203 if (wps_validate_m4(msg) < 0) 1204 return WPS_FAILURE; 1205 ret = wps_process_m4(wps, msg, &attr); 1206 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1207 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1208 wps->error_indication, 1209 wps->peer_dev.mac_addr); 1210 break; 1211 case WPS_M6: 1212 if (wps_validate_m6(msg) < 0) 1213 return WPS_FAILURE; 1214 ret = wps_process_m6(wps, msg, &attr); 1215 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1216 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1217 wps->error_indication, 1218 wps->peer_dev.mac_addr); 1219 break; 1220 case WPS_M8: 1221 if (wps_validate_m8(msg) < 0) 1222 return WPS_FAILURE; 1223 ret = wps_process_m8(wps, msg, &attr); 1224 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1225 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1226 wps->error_indication, 1227 wps->peer_dev.mac_addr); 1228 break; 1229 default: 1230 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1231 *attr.msg_type); 1232 return WPS_FAILURE; 1233 } 1234 1235 /* 1236 * Save a copy of the last message for Authenticator derivation if we 1237 * are continuing. However, skip M2D since it is not authenticated and 1238 * neither is the ACK/NACK response frame. This allows the possibly 1239 * following M2 to be processed correctly by using the previously sent 1240 * M1 in Authenticator derivation. 1241 */ 1242 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1243 /* Save a copy of the last message for Authenticator derivation 1244 */ 1245 wpabuf_free(wps->last_msg); 1246 wps->last_msg = wpabuf_dup(msg); 1247 } 1248 1249 return ret; 1250 } 1251 1252 1253 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1254 const struct wpabuf *msg) 1255 { 1256 struct wps_parse_attr attr; 1257 1258 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1259 1260 if (wps_parse_msg(msg, &attr) < 0) 1261 return WPS_FAILURE; 1262 1263 if (attr.msg_type == NULL) { 1264 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1265 return WPS_FAILURE; 1266 } 1267 1268 if (*attr.msg_type != WPS_WSC_ACK) { 1269 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1270 *attr.msg_type); 1271 return WPS_FAILURE; 1272 } 1273 1274 if (attr.registrar_nonce == NULL || 1275 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1276 { 1277 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1278 return WPS_FAILURE; 1279 } 1280 1281 if (attr.enrollee_nonce == NULL || 1282 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1283 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1284 return WPS_FAILURE; 1285 } 1286 1287 if (wps->state == RECV_ACK && wps->wps->ap) { 1288 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1289 "completed successfully"); 1290 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1291 wps->state = WPS_FINISHED; 1292 return WPS_DONE; 1293 } 1294 1295 return WPS_FAILURE; 1296 } 1297 1298 1299 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1300 const struct wpabuf *msg) 1301 { 1302 struct wps_parse_attr attr; 1303 u16 config_error; 1304 1305 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1306 1307 if (wps_parse_msg(msg, &attr) < 0) 1308 return WPS_FAILURE; 1309 1310 if (attr.msg_type == NULL) { 1311 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1312 return WPS_FAILURE; 1313 } 1314 1315 if (*attr.msg_type != WPS_WSC_NACK) { 1316 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1317 *attr.msg_type); 1318 return WPS_FAILURE; 1319 } 1320 1321 if (attr.registrar_nonce == NULL || 1322 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1323 { 1324 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1325 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1326 attr.registrar_nonce, WPS_NONCE_LEN); 1327 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1328 wps->nonce_r, WPS_NONCE_LEN); 1329 return WPS_FAILURE; 1330 } 1331 1332 if (attr.enrollee_nonce == NULL || 1333 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1334 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1335 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1336 attr.enrollee_nonce, WPS_NONCE_LEN); 1337 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1338 wps->nonce_e, WPS_NONCE_LEN); 1339 return WPS_FAILURE; 1340 } 1341 1342 if (attr.config_error == NULL) { 1343 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1344 "in WSC_NACK"); 1345 return WPS_FAILURE; 1346 } 1347 1348 config_error = WPA_GET_BE16(attr.config_error); 1349 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1350 "Configuration Error %d", config_error); 1351 1352 switch (wps->state) { 1353 case RECV_M4: 1354 wps_fail_event(wps->wps, WPS_M3, config_error, 1355 wps->error_indication, wps->peer_dev.mac_addr); 1356 break; 1357 case RECV_M6: 1358 wps_fail_event(wps->wps, WPS_M5, config_error, 1359 wps->error_indication, wps->peer_dev.mac_addr); 1360 break; 1361 case RECV_M8: 1362 wps_fail_event(wps->wps, WPS_M7, config_error, 1363 wps->error_indication, wps->peer_dev.mac_addr); 1364 break; 1365 default: 1366 break; 1367 } 1368 1369 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1370 * Enrollee is Authenticator */ 1371 wps->state = SEND_WSC_NACK; 1372 1373 return WPS_FAILURE; 1374 } 1375 1376 1377 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1378 enum wsc_op_code op_code, 1379 const struct wpabuf *msg) 1380 { 1381 1382 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1383 "op_code=%d)", 1384 (unsigned long) wpabuf_len(msg), op_code); 1385 1386 if (op_code == WSC_UPnP) { 1387 /* Determine the OpCode based on message type attribute */ 1388 struct wps_parse_attr attr; 1389 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1390 if (*attr.msg_type == WPS_WSC_ACK) 1391 op_code = WSC_ACK; 1392 else if (*attr.msg_type == WPS_WSC_NACK) 1393 op_code = WSC_NACK; 1394 } 1395 } 1396 1397 switch (op_code) { 1398 case WSC_MSG: 1399 case WSC_UPnP: 1400 return wps_process_wsc_msg(wps, msg); 1401 case WSC_ACK: 1402 if (wps_validate_wsc_ack(msg) < 0) 1403 return WPS_FAILURE; 1404 return wps_process_wsc_ack(wps, msg); 1405 case WSC_NACK: 1406 if (wps_validate_wsc_nack(msg) < 0) 1407 return WPS_FAILURE; 1408 return wps_process_wsc_nack(wps, msg); 1409 default: 1410 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1411 return WPS_FAILURE; 1412 } 1413 } 1414
