1 /* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/crypto.h" 13 #include "crypto/sha256.h" 14 #include "crypto/random.h" 15 #include "wps_i.h" 16 #include "wps_dev_attr.h" 17 18 19 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 20 { 21 u8 state; 22 if (wps->wps->ap) 23 state = wps->wps->wps_state; 24 else 25 state = WPS_STATE_NOT_CONFIGURED; 26 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 27 state); 28 wpabuf_put_be16(msg, ATTR_WPS_STATE); 29 wpabuf_put_be16(msg, 1); 30 wpabuf_put_u8(msg, state); 31 return 0; 32 } 33 34 35 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 36 { 37 u8 *hash; 38 const u8 *addr[4]; 39 size_t len[4]; 40 41 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 42 return -1; 43 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 44 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 45 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 46 47 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 48 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 49 "E-Hash derivation"); 50 return -1; 51 } 52 53 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 54 wpabuf_put_be16(msg, ATTR_E_HASH1); 55 wpabuf_put_be16(msg, SHA256_MAC_LEN); 56 hash = wpabuf_put(msg, SHA256_MAC_LEN); 57 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 58 addr[0] = wps->snonce; 59 len[0] = WPS_SECRET_NONCE_LEN; 60 addr[1] = wps->psk1; 61 len[1] = WPS_PSK_LEN; 62 addr[2] = wpabuf_head(wps->dh_pubkey_e); 63 len[2] = wpabuf_len(wps->dh_pubkey_e); 64 addr[3] = wpabuf_head(wps->dh_pubkey_r); 65 len[3] = wpabuf_len(wps->dh_pubkey_r); 66 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 67 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 70 wpabuf_put_be16(msg, ATTR_E_HASH2); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 74 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 75 addr[1] = wps->psk2; 76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 78 79 return 0; 80 } 81 82 83 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 84 { 85 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 86 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 87 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 88 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 89 return 0; 90 } 91 92 93 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 94 { 95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 96 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 99 WPS_SECRET_NONCE_LEN); 100 return 0; 101 } 102 103 104 static struct wpabuf * wps_build_m1(struct wps_data *wps) 105 { 106 struct wpabuf *msg; 107 u16 config_methods; 108 109 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 110 return NULL; 111 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 112 wps->nonce_e, WPS_NONCE_LEN); 113 114 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 115 msg = wpabuf_alloc(1000); 116 if (msg == NULL) 117 return NULL; 118 119 config_methods = wps->wps->config_methods; 120 if (wps->wps->ap && !wps->pbc_in_m1 && 121 (wps->dev_password_len != 0 || 122 (config_methods & WPS_CONFIG_DISPLAY))) { 123 /* 124 * These are the methods that the AP supports as an Enrollee 125 * for adding external Registrars, so remove PushButton. 126 * 127 * As a workaround for Windows 7 mechanism for probing WPS 128 * capabilities from M1, leave PushButton option if no PIN 129 * method is available or if WPS configuration enables PBC 130 * workaround. 131 */ 132 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 133 #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 if (wps->peer_pubkey_hash_set) { 518 u8 hash[WPS_HASH_LEN]; 519 sha256_vector(1, &pk, &pk_len, hash); 520 if (os_memcmp(hash, wps->peer_pubkey_hash, 521 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 522 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 523 wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 524 pk, pk_len); 525 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 526 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 527 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 528 wps->peer_pubkey_hash, 529 WPS_OOB_PUBKEY_HASH_LEN); 530 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 531 return -1; 532 } 533 } 534 535 wpabuf_free(wps->dh_pubkey_r); 536 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 537 if (wps->dh_pubkey_r == NULL) 538 return -1; 539 540 if (wps_derive_keys(wps) < 0) 541 return -1; 542 543 return 0; 544 } 545 546 547 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 548 { 549 if (r_hash1 == NULL) { 550 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 551 return -1; 552 } 553 554 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 555 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 556 557 return 0; 558 } 559 560 561 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 562 { 563 if (r_hash2 == NULL) { 564 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 565 return -1; 566 } 567 568 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 569 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 570 571 return 0; 572 } 573 574 575 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 576 { 577 u8 hash[SHA256_MAC_LEN]; 578 const u8 *addr[4]; 579 size_t len[4]; 580 581 if (r_snonce1 == NULL) { 582 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 583 return -1; 584 } 585 586 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 587 WPS_SECRET_NONCE_LEN); 588 589 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 590 addr[0] = r_snonce1; 591 len[0] = WPS_SECRET_NONCE_LEN; 592 addr[1] = wps->psk1; 593 len[1] = WPS_PSK_LEN; 594 addr[2] = wpabuf_head(wps->dh_pubkey_e); 595 len[2] = wpabuf_len(wps->dh_pubkey_e); 596 addr[3] = wpabuf_head(wps->dh_pubkey_r); 597 len[3] = wpabuf_len(wps->dh_pubkey_r); 598 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 599 600 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 601 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 602 "not match with the pre-committed value"); 603 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 604 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 605 return -1; 606 } 607 608 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 609 "half of the device password"); 610 611 return 0; 612 } 613 614 615 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 616 { 617 u8 hash[SHA256_MAC_LEN]; 618 const u8 *addr[4]; 619 size_t len[4]; 620 621 if (r_snonce2 == NULL) { 622 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 623 return -1; 624 } 625 626 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 627 WPS_SECRET_NONCE_LEN); 628 629 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 630 addr[0] = r_snonce2; 631 len[0] = WPS_SECRET_NONCE_LEN; 632 addr[1] = wps->psk2; 633 len[1] = WPS_PSK_LEN; 634 addr[2] = wpabuf_head(wps->dh_pubkey_e); 635 len[2] = wpabuf_len(wps->dh_pubkey_e); 636 addr[3] = wpabuf_head(wps->dh_pubkey_r); 637 len[3] = wpabuf_len(wps->dh_pubkey_r); 638 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 639 640 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 641 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 642 "not match with the pre-committed value"); 643 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 644 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 645 return -1; 646 } 647 648 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 649 "half of the device password"); 650 651 return 0; 652 } 653 654 655 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 656 size_t cred_len, int wps2) 657 { 658 struct wps_parse_attr attr; 659 struct wpabuf msg; 660 int ret = 0; 661 662 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 663 os_memset(&wps->cred, 0, sizeof(wps->cred)); 664 wpabuf_set(&msg, cred, cred_len); 665 if (wps_parse_msg(&msg, &attr) < 0 || 666 wps_process_cred(&attr, &wps->cred)) 667 return -1; 668 669 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 670 0) { 671 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 672 MACSTR ") does not match with own address (" MACSTR 673 ")", MAC2STR(wps->cred.mac_addr), 674 MAC2STR(wps->wps->dev.mac_addr)); 675 /* 676 * In theory, this could be consider fatal error, but there are 677 * number of deployed implementations using other address here 678 * due to unclarity in the specification. For interoperability 679 * reasons, allow this to be processed since we do not really 680 * use the MAC Address information for anything. 681 */ 682 #ifdef CONFIG_WPS_STRICT 683 if (wps2) { 684 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 685 "MAC Address in AP Settings"); 686 return -1; 687 } 688 #endif /* CONFIG_WPS_STRICT */ 689 } 690 691 #ifdef CONFIG_WPS2 692 if (!(wps->cred.encr_type & 693 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 694 if (wps->cred.encr_type & WPS_ENCR_WEP) { 695 wpa_printf(MSG_INFO, "WPS: Reject Credential " 696 "due to WEP configuration"); 697 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 698 return -2; 699 } 700 701 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 702 "invalid encr_type 0x%x", wps->cred.encr_type); 703 return -1; 704 } 705 #endif /* CONFIG_WPS2 */ 706 707 if (wps->wps->cred_cb) { 708 wps->cred.cred_attr = cred - 4; 709 wps->cred.cred_attr_len = cred_len + 4; 710 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 711 wps->cred.cred_attr = NULL; 712 wps->cred.cred_attr_len = 0; 713 } 714 715 return ret; 716 } 717 718 719 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 720 size_t cred_len[], size_t num_cred, int wps2) 721 { 722 size_t i; 723 int ok = 0; 724 725 if (wps->wps->ap) 726 return 0; 727 728 if (num_cred == 0) { 729 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 730 "received"); 731 return -1; 732 } 733 734 for (i = 0; i < num_cred; i++) { 735 int res; 736 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 737 if (res == 0) 738 ok++; 739 else if (res == -2) 740 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 741 else 742 return -1; 743 } 744 745 if (ok == 0) { 746 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 747 "received"); 748 return -1; 749 } 750 751 return 0; 752 } 753 754 755 static int wps_process_ap_settings_e(struct wps_data *wps, 756 struct wps_parse_attr *attr, 757 struct wpabuf *attrs, int wps2) 758 { 759 struct wps_credential cred; 760 761 if (!wps->wps->ap) 762 return 0; 763 764 if (wps_process_ap_settings(attr, &cred) < 0) 765 return -1; 766 767 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 768 "Registrar"); 769 770 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 771 0) { 772 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 773 MACSTR ") does not match with own address (" MACSTR 774 ")", MAC2STR(cred.mac_addr), 775 MAC2STR(wps->wps->dev.mac_addr)); 776 /* 777 * In theory, this could be consider fatal error, but there are 778 * number of deployed implementations using other address here 779 * due to unclarity in the specification. For interoperability 780 * reasons, allow this to be processed since we do not really 781 * use the MAC Address information for anything. 782 */ 783 #ifdef CONFIG_WPS_STRICT 784 if (wps2) { 785 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 786 "MAC Address in AP Settings"); 787 return -1; 788 } 789 #endif /* CONFIG_WPS_STRICT */ 790 } 791 792 #ifdef CONFIG_WPS2 793 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 794 { 795 if (cred.encr_type & WPS_ENCR_WEP) { 796 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 797 "due to WEP configuration"); 798 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 799 return -1; 800 } 801 802 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 803 "invalid encr_type 0x%x", cred.encr_type); 804 return -1; 805 } 806 #endif /* CONFIG_WPS2 */ 807 808 #ifdef CONFIG_WPS_STRICT 809 if (wps2) { 810 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 811 WPS_ENCR_TKIP || 812 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 813 WPS_AUTH_WPAPSK) { 814 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 815 "AP Settings: WPA-Personal/TKIP only"); 816 wps->error_indication = 817 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 818 return -1; 819 } 820 } 821 #endif /* CONFIG_WPS_STRICT */ 822 823 #ifdef CONFIG_WPS2 824 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 825 { 826 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 827 "TKIP+AES"); 828 cred.encr_type |= WPS_ENCR_AES; 829 } 830 831 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 832 WPS_AUTH_WPAPSK) { 833 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 834 "WPAPSK+WPA2PSK"); 835 cred.auth_type |= WPS_AUTH_WPA2PSK; 836 } 837 #endif /* CONFIG_WPS2 */ 838 839 if (wps->wps->cred_cb) { 840 cred.cred_attr = wpabuf_head(attrs); 841 cred.cred_attr_len = wpabuf_len(attrs); 842 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 843 } 844 845 return 0; 846 } 847 848 849 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 850 { 851 u16 id; 852 853 if (dev_pw_id == NULL) { 854 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 855 return -1; 856 } 857 858 id = WPA_GET_BE16(dev_pw_id); 859 if (wps->dev_pw_id == id) { 860 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 861 return 0; 862 } 863 864 #ifdef CONFIG_P2P 865 if ((id == DEV_PW_DEFAULT && 866 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 867 (id == DEV_PW_REGISTRAR_SPECIFIED && 868 wps->dev_pw_id == DEV_PW_DEFAULT)) { 869 /* 870 * Common P2P use cases indicate whether the PIN is from the 871 * client or GO using Device Password Id in M1/M2 in a way that 872 * does not look fully compliant with WSC specification. Anyway, 873 * this is deployed and needs to be allowed, so ignore changes 874 * between Registrar-Specified and Default PIN. 875 */ 876 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 877 "change"); 878 return 0; 879 } 880 #endif /* CONFIG_P2P */ 881 882 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 883 "ID from %u to %u", wps->dev_pw_id, id); 884 885 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 886 wpa_printf(MSG_DEBUG, 887 "WPS: Workaround - ignore PBC-to-PIN change"); 888 return 0; 889 } 890 891 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 892 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 893 os_free(wps->dev_password); 894 wps->dev_pw_id = wps->alt_dev_pw_id; 895 wps->dev_password = wps->alt_dev_password; 896 wps->dev_password_len = wps->alt_dev_password_len; 897 wps->alt_dev_password = NULL; 898 wps->alt_dev_password_len = 0; 899 return 0; 900 } 901 902 return -1; 903 } 904 905 906 static enum wps_process_res wps_process_m2(struct wps_data *wps, 907 const struct wpabuf *msg, 908 struct wps_parse_attr *attr) 909 { 910 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 911 912 if (wps->state != RECV_M2) { 913 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 914 "receiving M2", wps->state); 915 wps->state = SEND_WSC_NACK; 916 return WPS_CONTINUE; 917 } 918 919 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 920 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 921 wps_process_uuid_r(wps, attr->uuid_r) || 922 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 923 wps->state = SEND_WSC_NACK; 924 return WPS_CONTINUE; 925 } 926 927 /* 928 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 929 * special locked mode is used to allow protocol run up to M7 in order 930 * to support external Registrars that only learn the current AP 931 * configuration without changing it. 932 */ 933 if (wps->wps->ap && 934 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 935 wps->dev_password == NULL)) { 936 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 937 "registration of a new Registrar"); 938 wps->config_error = WPS_CFG_SETUP_LOCKED; 939 wps->state = SEND_WSC_NACK; 940 return WPS_CONTINUE; 941 } 942 943 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 944 wps_process_authenticator(wps, attr->authenticator, msg) || 945 wps_process_device_attrs(&wps->peer_dev, attr)) { 946 wps->state = SEND_WSC_NACK; 947 return WPS_CONTINUE; 948 } 949 950 #ifdef CONFIG_WPS_NFC 951 if (wps->peer_pubkey_hash_set) { 952 struct wpabuf *decrypted; 953 struct wps_parse_attr eattr; 954 955 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 956 attr->encr_settings_len); 957 if (decrypted == NULL) { 958 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 959 "Encrypted Settings attribute"); 960 wps->state = SEND_WSC_NACK; 961 return WPS_CONTINUE; 962 } 963 964 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 965 "Settings attribute"); 966 if (wps_parse_msg(decrypted, &eattr) < 0 || 967 wps_process_key_wrap_auth(wps, decrypted, 968 eattr.key_wrap_auth) || 969 wps_process_creds(wps, eattr.cred, eattr.cred_len, 970 eattr.num_cred, attr->version2 != NULL)) { 971 wpabuf_free(decrypted); 972 wps->state = SEND_WSC_NACK; 973 return WPS_CONTINUE; 974 } 975 wpabuf_free(decrypted); 976 977 wps->state = WPS_MSG_DONE; 978 return WPS_CONTINUE; 979 } 980 #endif /* CONFIG_WPS_NFC */ 981 982 wps->state = SEND_M3; 983 return WPS_CONTINUE; 984 } 985 986 987 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 988 struct wps_parse_attr *attr) 989 { 990 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 991 992 if (wps->state != RECV_M2) { 993 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 994 "receiving M2D", wps->state); 995 wps->state = SEND_WSC_NACK; 996 return WPS_CONTINUE; 997 } 998 999 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1000 attr->manufacturer, attr->manufacturer_len); 1001 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1002 attr->model_name, attr->model_name_len); 1003 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1004 attr->model_number, attr->model_number_len); 1005 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1006 attr->serial_number, attr->serial_number_len); 1007 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1008 attr->dev_name, attr->dev_name_len); 1009 1010 if (wps->wps->event_cb) { 1011 union wps_event_data data; 1012 struct wps_event_m2d *m2d = &data.m2d; 1013 os_memset(&data, 0, sizeof(data)); 1014 if (attr->config_methods) 1015 m2d->config_methods = 1016 WPA_GET_BE16(attr->config_methods); 1017 m2d->manufacturer = attr->manufacturer; 1018 m2d->manufacturer_len = attr->manufacturer_len; 1019 m2d->model_name = attr->model_name; 1020 m2d->model_name_len = attr->model_name_len; 1021 m2d->model_number = attr->model_number; 1022 m2d->model_number_len = attr->model_number_len; 1023 m2d->serial_number = attr->serial_number; 1024 m2d->serial_number_len = attr->serial_number_len; 1025 m2d->dev_name = attr->dev_name; 1026 m2d->dev_name_len = attr->dev_name_len; 1027 m2d->primary_dev_type = attr->primary_dev_type; 1028 if (attr->config_error) 1029 m2d->config_error = 1030 WPA_GET_BE16(attr->config_error); 1031 if (attr->dev_password_id) 1032 m2d->dev_password_id = 1033 WPA_GET_BE16(attr->dev_password_id); 1034 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1035 } 1036 1037 wps->state = RECEIVED_M2D; 1038 return WPS_CONTINUE; 1039 } 1040 1041 1042 static enum wps_process_res wps_process_m4(struct wps_data *wps, 1043 const struct wpabuf *msg, 1044 struct wps_parse_attr *attr) 1045 { 1046 struct wpabuf *decrypted; 1047 struct wps_parse_attr eattr; 1048 1049 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1050 1051 if (wps->state != RECV_M4) { 1052 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1053 "receiving M4", wps->state); 1054 wps->state = SEND_WSC_NACK; 1055 return WPS_CONTINUE; 1056 } 1057 1058 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1059 wps_process_authenticator(wps, attr->authenticator, msg) || 1060 wps_process_r_hash1(wps, attr->r_hash1) || 1061 wps_process_r_hash2(wps, attr->r_hash2)) { 1062 wps->state = SEND_WSC_NACK; 1063 return WPS_CONTINUE; 1064 } 1065 1066 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1067 attr->encr_settings_len); 1068 if (decrypted == NULL) { 1069 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1070 "Settings attribute"); 1071 wps->state = SEND_WSC_NACK; 1072 return WPS_CONTINUE; 1073 } 1074 1075 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1076 wpabuf_free(decrypted); 1077 wps->state = SEND_WSC_NACK; 1078 return WPS_CONTINUE; 1079 } 1080 1081 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1082 "attribute"); 1083 if (wps_parse_msg(decrypted, &eattr) < 0 || 1084 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1085 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1086 wpabuf_free(decrypted); 1087 wps->state = SEND_WSC_NACK; 1088 return WPS_CONTINUE; 1089 } 1090 wpabuf_free(decrypted); 1091 1092 wps->state = SEND_M5; 1093 return WPS_CONTINUE; 1094 } 1095 1096 1097 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1098 const struct wpabuf *msg, 1099 struct wps_parse_attr *attr) 1100 { 1101 struct wpabuf *decrypted; 1102 struct wps_parse_attr eattr; 1103 1104 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1105 1106 if (wps->state != RECV_M6) { 1107 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1108 "receiving M6", wps->state); 1109 wps->state = SEND_WSC_NACK; 1110 return WPS_CONTINUE; 1111 } 1112 1113 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1114 wps_process_authenticator(wps, attr->authenticator, msg)) { 1115 wps->state = SEND_WSC_NACK; 1116 return WPS_CONTINUE; 1117 } 1118 1119 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1120 attr->encr_settings_len); 1121 if (decrypted == NULL) { 1122 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1123 "Settings attribute"); 1124 wps->state = SEND_WSC_NACK; 1125 return WPS_CONTINUE; 1126 } 1127 1128 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1129 wpabuf_free(decrypted); 1130 wps->state = SEND_WSC_NACK; 1131 return WPS_CONTINUE; 1132 } 1133 1134 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1135 "attribute"); 1136 if (wps_parse_msg(decrypted, &eattr) < 0 || 1137 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1138 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1139 wpabuf_free(decrypted); 1140 wps->state = SEND_WSC_NACK; 1141 return WPS_CONTINUE; 1142 } 1143 wpabuf_free(decrypted); 1144 1145 if (wps->wps->ap) 1146 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1147 NULL); 1148 1149 wps->state = SEND_M7; 1150 return WPS_CONTINUE; 1151 } 1152 1153 1154 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1155 const struct wpabuf *msg, 1156 struct wps_parse_attr *attr) 1157 { 1158 struct wpabuf *decrypted; 1159 struct wps_parse_attr eattr; 1160 1161 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1162 1163 if (wps->state != RECV_M8) { 1164 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1165 "receiving M8", wps->state); 1166 wps->state = SEND_WSC_NACK; 1167 return WPS_CONTINUE; 1168 } 1169 1170 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1171 wps_process_authenticator(wps, attr->authenticator, msg)) { 1172 wps->state = SEND_WSC_NACK; 1173 return WPS_CONTINUE; 1174 } 1175 1176 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1177 /* 1178 * Stop here if special ap_setup_locked == 2 mode allowed the 1179 * protocol to continue beyond M2. This allows ER to learn the 1180 * current AP settings without changing them. 1181 */ 1182 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1183 "registration of a new Registrar"); 1184 wps->config_error = WPS_CFG_SETUP_LOCKED; 1185 wps->state = SEND_WSC_NACK; 1186 return WPS_CONTINUE; 1187 } 1188 1189 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1190 attr->encr_settings_len); 1191 if (decrypted == NULL) { 1192 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1193 "Settings attribute"); 1194 wps->state = SEND_WSC_NACK; 1195 return WPS_CONTINUE; 1196 } 1197 1198 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1199 attr->version2 != NULL) < 0) { 1200 wpabuf_free(decrypted); 1201 wps->state = SEND_WSC_NACK; 1202 return WPS_CONTINUE; 1203 } 1204 1205 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1206 "attribute"); 1207 if (wps_parse_msg(decrypted, &eattr) < 0 || 1208 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1209 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1210 eattr.num_cred, attr->version2 != NULL) || 1211 wps_process_ap_settings_e(wps, &eattr, decrypted, 1212 attr->version2 != NULL)) { 1213 wpabuf_free(decrypted); 1214 wps->state = SEND_WSC_NACK; 1215 return WPS_CONTINUE; 1216 } 1217 wpabuf_free(decrypted); 1218 1219 wps->state = WPS_MSG_DONE; 1220 return WPS_CONTINUE; 1221 } 1222 1223 1224 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1225 const struct wpabuf *msg) 1226 { 1227 struct wps_parse_attr attr; 1228 enum wps_process_res ret = WPS_CONTINUE; 1229 1230 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1231 1232 if (wps_parse_msg(msg, &attr) < 0) 1233 return WPS_FAILURE; 1234 1235 if (attr.enrollee_nonce == NULL || 1236 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1237 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1238 return WPS_FAILURE; 1239 } 1240 1241 if (attr.msg_type == NULL) { 1242 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1243 wps->state = SEND_WSC_NACK; 1244 return WPS_CONTINUE; 1245 } 1246 1247 switch (*attr.msg_type) { 1248 case WPS_M2: 1249 if (wps_validate_m2(msg) < 0) 1250 return WPS_FAILURE; 1251 ret = wps_process_m2(wps, msg, &attr); 1252 break; 1253 case WPS_M2D: 1254 if (wps_validate_m2d(msg) < 0) 1255 return WPS_FAILURE; 1256 ret = wps_process_m2d(wps, &attr); 1257 break; 1258 case WPS_M4: 1259 if (wps_validate_m4(msg) < 0) 1260 return WPS_FAILURE; 1261 ret = wps_process_m4(wps, msg, &attr); 1262 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1263 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1264 wps->error_indication, 1265 wps->peer_dev.mac_addr); 1266 break; 1267 case WPS_M6: 1268 if (wps_validate_m6(msg) < 0) 1269 return WPS_FAILURE; 1270 ret = wps_process_m6(wps, msg, &attr); 1271 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1272 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1273 wps->error_indication, 1274 wps->peer_dev.mac_addr); 1275 break; 1276 case WPS_M8: 1277 if (wps_validate_m8(msg) < 0) 1278 return WPS_FAILURE; 1279 ret = wps_process_m8(wps, msg, &attr); 1280 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1281 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1282 wps->error_indication, 1283 wps->peer_dev.mac_addr); 1284 break; 1285 default: 1286 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1287 *attr.msg_type); 1288 return WPS_FAILURE; 1289 } 1290 1291 /* 1292 * Save a copy of the last message for Authenticator derivation if we 1293 * are continuing. However, skip M2D since it is not authenticated and 1294 * neither is the ACK/NACK response frame. This allows the possibly 1295 * following M2 to be processed correctly by using the previously sent 1296 * M1 in Authenticator derivation. 1297 */ 1298 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1299 /* Save a copy of the last message for Authenticator derivation 1300 */ 1301 wpabuf_free(wps->last_msg); 1302 wps->last_msg = wpabuf_dup(msg); 1303 } 1304 1305 return ret; 1306 } 1307 1308 1309 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1310 const struct wpabuf *msg) 1311 { 1312 struct wps_parse_attr attr; 1313 1314 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1315 1316 if (wps_parse_msg(msg, &attr) < 0) 1317 return WPS_FAILURE; 1318 1319 if (attr.msg_type == NULL) { 1320 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1321 return WPS_FAILURE; 1322 } 1323 1324 if (*attr.msg_type != WPS_WSC_ACK) { 1325 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1326 *attr.msg_type); 1327 return WPS_FAILURE; 1328 } 1329 1330 if (attr.registrar_nonce == NULL || 1331 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1332 { 1333 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1334 return WPS_FAILURE; 1335 } 1336 1337 if (attr.enrollee_nonce == NULL || 1338 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1339 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1340 return WPS_FAILURE; 1341 } 1342 1343 if (wps->state == RECV_ACK && wps->wps->ap) { 1344 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1345 "completed successfully"); 1346 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1347 wps->state = WPS_FINISHED; 1348 return WPS_DONE; 1349 } 1350 1351 return WPS_FAILURE; 1352 } 1353 1354 1355 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1356 const struct wpabuf *msg) 1357 { 1358 struct wps_parse_attr attr; 1359 u16 config_error; 1360 1361 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1362 1363 if (wps_parse_msg(msg, &attr) < 0) 1364 return WPS_FAILURE; 1365 1366 if (attr.msg_type == NULL) { 1367 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1368 return WPS_FAILURE; 1369 } 1370 1371 if (*attr.msg_type != WPS_WSC_NACK) { 1372 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1373 *attr.msg_type); 1374 return WPS_FAILURE; 1375 } 1376 1377 if (attr.registrar_nonce == NULL || 1378 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1379 { 1380 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1381 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1382 attr.registrar_nonce, WPS_NONCE_LEN); 1383 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1384 wps->nonce_r, WPS_NONCE_LEN); 1385 return WPS_FAILURE; 1386 } 1387 1388 if (attr.enrollee_nonce == NULL || 1389 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1390 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1391 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1392 attr.enrollee_nonce, WPS_NONCE_LEN); 1393 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1394 wps->nonce_e, WPS_NONCE_LEN); 1395 return WPS_FAILURE; 1396 } 1397 1398 if (attr.config_error == NULL) { 1399 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1400 "in WSC_NACK"); 1401 return WPS_FAILURE; 1402 } 1403 1404 config_error = WPA_GET_BE16(attr.config_error); 1405 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1406 "Configuration Error %d", config_error); 1407 1408 switch (wps->state) { 1409 case RECV_M4: 1410 wps_fail_event(wps->wps, WPS_M3, config_error, 1411 wps->error_indication, wps->peer_dev.mac_addr); 1412 break; 1413 case RECV_M6: 1414 wps_fail_event(wps->wps, WPS_M5, config_error, 1415 wps->error_indication, wps->peer_dev.mac_addr); 1416 break; 1417 case RECV_M8: 1418 wps_fail_event(wps->wps, WPS_M7, config_error, 1419 wps->error_indication, wps->peer_dev.mac_addr); 1420 break; 1421 default: 1422 break; 1423 } 1424 1425 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1426 * Enrollee is Authenticator */ 1427 wps->state = SEND_WSC_NACK; 1428 1429 return WPS_FAILURE; 1430 } 1431 1432 1433 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1434 enum wsc_op_code op_code, 1435 const struct wpabuf *msg) 1436 { 1437 1438 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1439 "op_code=%d)", 1440 (unsigned long) wpabuf_len(msg), op_code); 1441 1442 if (op_code == WSC_UPnP) { 1443 /* Determine the OpCode based on message type attribute */ 1444 struct wps_parse_attr attr; 1445 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1446 if (*attr.msg_type == WPS_WSC_ACK) 1447 op_code = WSC_ACK; 1448 else if (*attr.msg_type == WPS_WSC_NACK) 1449 op_code = WSC_NACK; 1450 } 1451 } 1452 1453 switch (op_code) { 1454 case WSC_MSG: 1455 case WSC_UPnP: 1456 return wps_process_wsc_msg(wps, msg); 1457 case WSC_ACK: 1458 if (wps_validate_wsc_ack(msg) < 0) 1459 return WPS_FAILURE; 1460 return wps_process_wsc_ack(wps, msg); 1461 case WSC_NACK: 1462 if (wps_validate_wsc_nack(msg) < 0) 1463 return WPS_FAILURE; 1464 return wps_process_wsc_nack(wps, msg); 1465 default: 1466 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1467 return WPS_FAILURE; 1468 } 1469 } 1470