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 u8 multi_ap_backhaul_sta = 0; 109 110 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 111 return NULL; 112 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 113 wps->nonce_e, WPS_NONCE_LEN); 114 115 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 116 msg = wpabuf_alloc(1000); 117 if (msg == NULL) 118 return NULL; 119 120 config_methods = wps->wps->config_methods; 121 if (wps->wps->ap && !wps->pbc_in_m1 && 122 (wps->dev_password_len != 0 || 123 (config_methods & WPS_CONFIG_DISPLAY))) { 124 /* 125 * These are the methods that the AP supports as an Enrollee 126 * for adding external Registrars, so remove PushButton. 127 * 128 * As a workaround for Windows 7 mechanism for probing WPS 129 * capabilities from M1, leave PushButton option if no PIN 130 * method is available or if WPS configuration enables PBC 131 * workaround. 132 */ 133 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 134 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 135 WPS_CONFIG_PHY_PUSHBUTTON); 136 } 137 138 if (wps->multi_ap_backhaul_sta) 139 multi_ap_backhaul_sta = MULTI_AP_BACKHAUL_STA; 140 141 if (wps_build_version(msg) || 142 wps_build_msg_type(msg, WPS_M1) || 143 wps_build_uuid_e(msg, wps->uuid_e) || 144 wps_build_mac_addr(msg, wps->mac_addr_e) || 145 wps_build_enrollee_nonce(wps, msg) || 146 wps_build_public_key(wps, msg) || 147 wps_build_auth_type_flags(wps, msg) || 148 wps_build_encr_type_flags(wps, msg) || 149 wps_build_conn_type_flags(wps, msg) || 150 wps_build_config_methods(msg, config_methods) || 151 wps_build_wps_state(wps, msg) || 152 wps_build_device_attrs(&wps->wps->dev, msg) || 153 wps_build_rf_bands(&wps->wps->dev, msg, 154 wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 155 wps_build_assoc_state(wps, msg) || 156 wps_build_dev_password_id(msg, wps->dev_pw_id) || 157 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 158 wps_build_os_version(&wps->wps->dev, msg) || 159 wps_build_wfa_ext(msg, 0, NULL, 0, multi_ap_backhaul_sta) || 160 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 161 wpabuf_free(msg); 162 return NULL; 163 } 164 165 wps->state = RECV_M2; 166 return msg; 167 } 168 169 170 static struct wpabuf * wps_build_m3(struct wps_data *wps) 171 { 172 struct wpabuf *msg; 173 174 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 175 176 if (wps->dev_password == NULL) { 177 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 178 return NULL; 179 } 180 if (wps_derive_psk(wps, wps->dev_password, wps->dev_password_len) < 0) 181 return NULL; 182 183 if (wps->wps->ap && random_pool_ready() != 1) { 184 wpa_printf(MSG_INFO, 185 "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); 186 return NULL; 187 } 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, 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, 0) || 231 wps_build_authenticator(wps, msg)) { 232 wpabuf_clear_free(plain); 233 wpabuf_free(msg); 234 return NULL; 235 } 236 wpabuf_clear_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->ap_auth_type; 256 257 /* 258 * Work around issues with Windows 7 WPS implementation not liking 259 * multiple Authentication Type bits in M7 AP Settings attribute by 260 * showing only the most secure option from current configuration. 261 */ 262 if (auth_type & WPS_AUTH_WPA2PSK) 263 auth_type = WPS_AUTH_WPA2PSK; 264 else if (auth_type & WPS_AUTH_WPAPSK) 265 auth_type = WPS_AUTH_WPAPSK; 266 else if (auth_type & WPS_AUTH_OPEN) 267 auth_type = WPS_AUTH_OPEN; 268 269 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 270 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 271 wpabuf_put_be16(msg, 2); 272 wpabuf_put_be16(msg, auth_type); 273 return 0; 274 } 275 276 277 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 278 { 279 u16 encr_type = wps->wps->ap_encr_type; 280 281 /* 282 * Work around issues with Windows 7 WPS implementation not liking 283 * multiple Encryption Type bits in M7 AP Settings attribute by 284 * showing only the most secure option from current configuration. 285 */ 286 if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 287 if (encr_type & WPS_ENCR_AES) 288 encr_type = WPS_ENCR_AES; 289 else if (encr_type & WPS_ENCR_TKIP) 290 encr_type = WPS_ENCR_TKIP; 291 } 292 293 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 294 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 295 wpabuf_put_be16(msg, 2); 296 wpabuf_put_be16(msg, encr_type); 297 return 0; 298 } 299 300 301 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 302 { 303 if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 304 wps->wps->network_key_len == 0) { 305 char hex[65]; 306 u8 psk[32]; 307 /* Generate a random per-device PSK */ 308 if (random_pool_ready() != 1 || 309 random_get_bytes(psk, sizeof(psk)) < 0) { 310 wpa_printf(MSG_INFO, 311 "WPS: Could not generate random PSK"); 312 return -1; 313 } 314 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 315 psk, sizeof(psk)); 316 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 317 (unsigned int) wps->new_psk_len * 2); 318 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 319 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 320 wpabuf_put_be16(msg, sizeof(psk) * 2); 321 wpabuf_put_data(msg, hex, sizeof(psk) * 2); 322 if (wps->wps->registrar) { 323 wps_cb_new_psk(wps->wps->registrar, 324 wps->peer_dev.mac_addr, 325 wps->p2p_dev_addr, psk, sizeof(psk)); 326 } 327 return 0; 328 } 329 330 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 331 (unsigned int) wps->wps->network_key_len); 332 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 333 wpabuf_put_be16(msg, wps->wps->network_key_len); 334 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 335 return 0; 336 } 337 338 339 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 340 { 341 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 342 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 343 wpabuf_put_be16(msg, ETH_ALEN); 344 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 345 return 0; 346 } 347 348 349 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 350 { 351 const u8 *start, *end; 352 int ret; 353 354 if (wps->wps->ap_settings) { 355 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 356 wpabuf_put_data(plain, wps->wps->ap_settings, 357 wps->wps->ap_settings_len); 358 return 0; 359 } 360 361 wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 362 start = wpabuf_put(plain, 0); 363 ret = wps_build_cred_ssid(wps, plain) || 364 wps_build_cred_mac_addr(wps, plain) || 365 wps_build_cred_auth_type(wps, plain) || 366 wps_build_cred_encr_type(wps, plain) || 367 wps_build_cred_network_key(wps, plain); 368 end = wpabuf_put(plain, 0); 369 370 wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 371 start, end - start); 372 373 return ret; 374 } 375 376 377 static struct wpabuf * wps_build_m7(struct wps_data *wps) 378 { 379 struct wpabuf *msg, *plain; 380 381 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 382 383 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 384 if (plain == NULL) 385 return NULL; 386 387 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 388 if (msg == NULL) { 389 wpabuf_free(plain); 390 return NULL; 391 } 392 393 if (wps_build_version(msg) || 394 wps_build_msg_type(msg, WPS_M7) || 395 wps_build_registrar_nonce(wps, msg) || 396 wps_build_e_snonce2(wps, plain) || 397 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 398 wps_build_key_wrap_auth(wps, plain) || 399 wps_build_encr_settings(wps, msg, plain) || 400 wps_build_wfa_ext(msg, 0, NULL, 0, 0) || 401 wps_build_authenticator(wps, msg)) { 402 wpabuf_clear_free(plain); 403 wpabuf_free(msg); 404 return NULL; 405 } 406 wpabuf_clear_free(plain); 407 408 if (wps->wps->ap && wps->wps->registrar) { 409 /* 410 * If the Registrar is only learning our current configuration, 411 * it may not continue protocol run to successful completion. 412 * Store information here to make sure it remains available. 413 */ 414 wps_device_store(wps->wps->registrar, &wps->peer_dev, 415 wps->uuid_r); 416 } 417 418 wps->state = RECV_M8; 419 return msg; 420 } 421 422 423 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 424 { 425 struct wpabuf *msg; 426 427 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 428 429 msg = wpabuf_alloc(1000); 430 if (msg == NULL) 431 return NULL; 432 433 if (wps_build_version(msg) || 434 wps_build_msg_type(msg, WPS_WSC_DONE) || 435 wps_build_enrollee_nonce(wps, msg) || 436 wps_build_registrar_nonce(wps, msg) || 437 wps_build_wfa_ext(msg, 0, NULL, 0, 0)) { 438 wpabuf_free(msg); 439 return NULL; 440 } 441 442 if (wps->wps->ap) 443 wps->state = RECV_ACK; 444 else { 445 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 446 wps->state = WPS_FINISHED; 447 } 448 return msg; 449 } 450 451 452 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 453 enum wsc_op_code *op_code) 454 { 455 struct wpabuf *msg; 456 457 switch (wps->state) { 458 case SEND_M1: 459 msg = wps_build_m1(wps); 460 *op_code = WSC_MSG; 461 break; 462 case SEND_M3: 463 msg = wps_build_m3(wps); 464 *op_code = WSC_MSG; 465 break; 466 case SEND_M5: 467 msg = wps_build_m5(wps); 468 *op_code = WSC_MSG; 469 break; 470 case SEND_M7: 471 msg = wps_build_m7(wps); 472 *op_code = WSC_MSG; 473 break; 474 case RECEIVED_M2D: 475 if (wps->wps->ap) { 476 msg = wps_build_wsc_nack(wps); 477 *op_code = WSC_NACK; 478 break; 479 } 480 msg = wps_build_wsc_ack(wps); 481 *op_code = WSC_ACK; 482 if (msg) { 483 /* Another M2/M2D may be received */ 484 wps->state = RECV_M2; 485 } 486 break; 487 case SEND_WSC_NACK: 488 msg = wps_build_wsc_nack(wps); 489 *op_code = WSC_NACK; 490 break; 491 case WPS_MSG_DONE: 492 msg = wps_build_wsc_done(wps); 493 *op_code = WSC_Done; 494 break; 495 default: 496 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 497 "a message", wps->state); 498 msg = NULL; 499 break; 500 } 501 502 if (*op_code == WSC_MSG && msg) { 503 /* Save a copy of the last message for Authenticator derivation 504 */ 505 wpabuf_free(wps->last_msg); 506 wps->last_msg = wpabuf_dup(msg); 507 } 508 509 return msg; 510 } 511 512 513 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 514 { 515 if (r_nonce == NULL) { 516 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 517 return -1; 518 } 519 520 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 521 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 522 wps->nonce_r, WPS_NONCE_LEN); 523 524 return 0; 525 } 526 527 528 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 529 { 530 if (e_nonce == NULL) { 531 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 532 return -1; 533 } 534 535 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 536 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 537 return -1; 538 } 539 540 return 0; 541 } 542 543 544 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 545 { 546 if (uuid_r == NULL) { 547 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 548 return -1; 549 } 550 551 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 552 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 553 554 return 0; 555 } 556 557 558 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 559 size_t pk_len) 560 { 561 if (pk == NULL || pk_len == 0) { 562 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 563 return -1; 564 } 565 566 if (wps->peer_pubkey_hash_set) { 567 u8 hash[WPS_HASH_LEN]; 568 sha256_vector(1, &pk, &pk_len, hash); 569 if (os_memcmp_const(hash, wps->peer_pubkey_hash, 570 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 571 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 572 wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 573 pk, pk_len); 574 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 575 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 576 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 577 wps->peer_pubkey_hash, 578 WPS_OOB_PUBKEY_HASH_LEN); 579 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 580 return -1; 581 } 582 } 583 584 wpabuf_free(wps->dh_pubkey_r); 585 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 586 if (wps->dh_pubkey_r == NULL) 587 return -1; 588 589 if (wps_derive_keys(wps) < 0) 590 return -1; 591 592 return 0; 593 } 594 595 596 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 597 { 598 if (r_hash1 == NULL) { 599 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 600 return -1; 601 } 602 603 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 604 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 605 606 return 0; 607 } 608 609 610 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 611 { 612 if (r_hash2 == NULL) { 613 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 614 return -1; 615 } 616 617 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 618 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 619 620 return 0; 621 } 622 623 624 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 625 { 626 u8 hash[SHA256_MAC_LEN]; 627 const u8 *addr[4]; 628 size_t len[4]; 629 630 if (r_snonce1 == NULL) { 631 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 632 return -1; 633 } 634 635 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 636 WPS_SECRET_NONCE_LEN); 637 638 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 639 addr[0] = r_snonce1; 640 len[0] = WPS_SECRET_NONCE_LEN; 641 addr[1] = wps->psk1; 642 len[1] = WPS_PSK_LEN; 643 addr[2] = wpabuf_head(wps->dh_pubkey_e); 644 len[2] = wpabuf_len(wps->dh_pubkey_e); 645 addr[3] = wpabuf_head(wps->dh_pubkey_r); 646 len[3] = wpabuf_len(wps->dh_pubkey_r); 647 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 648 649 if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 650 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 651 "not match with the pre-committed value"); 652 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 653 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 654 return -1; 655 } 656 657 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 658 "half of the device password"); 659 660 return 0; 661 } 662 663 664 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 665 { 666 u8 hash[SHA256_MAC_LEN]; 667 const u8 *addr[4]; 668 size_t len[4]; 669 670 if (r_snonce2 == NULL) { 671 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 672 return -1; 673 } 674 675 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 676 WPS_SECRET_NONCE_LEN); 677 678 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 679 addr[0] = r_snonce2; 680 len[0] = WPS_SECRET_NONCE_LEN; 681 addr[1] = wps->psk2; 682 len[1] = WPS_PSK_LEN; 683 addr[2] = wpabuf_head(wps->dh_pubkey_e); 684 len[2] = wpabuf_len(wps->dh_pubkey_e); 685 addr[3] = wpabuf_head(wps->dh_pubkey_r); 686 len[3] = wpabuf_len(wps->dh_pubkey_r); 687 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 688 689 if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 690 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 691 "not match with the pre-committed value"); 692 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 693 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 694 return -1; 695 } 696 697 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 698 "half of the device password"); 699 700 return 0; 701 } 702 703 704 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 705 size_t cred_len, int wps2) 706 { 707 struct wps_parse_attr attr; 708 struct wpabuf msg; 709 int ret = 0; 710 711 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 712 os_memset(&wps->cred, 0, sizeof(wps->cred)); 713 wpabuf_set(&msg, cred, cred_len); 714 if (wps_parse_msg(&msg, &attr) < 0 || 715 wps_process_cred(&attr, &wps->cred)) 716 return -1; 717 718 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 719 0) { 720 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 721 MACSTR ") does not match with own address (" MACSTR 722 ")", MAC2STR(wps->cred.mac_addr), 723 MAC2STR(wps->wps->dev.mac_addr)); 724 /* 725 * In theory, this could be consider fatal error, but there are 726 * number of deployed implementations using other address here 727 * due to unclarity in the specification. For interoperability 728 * reasons, allow this to be processed since we do not really 729 * use the MAC Address information for anything. 730 */ 731 #ifdef CONFIG_WPS_STRICT 732 if (wps2) { 733 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 734 "MAC Address in AP Settings"); 735 return -1; 736 } 737 #endif /* CONFIG_WPS_STRICT */ 738 } 739 740 if (!(wps->cred.encr_type & 741 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 742 if (wps->cred.encr_type & WPS_ENCR_WEP) { 743 wpa_printf(MSG_INFO, "WPS: Reject Credential " 744 "due to WEP configuration"); 745 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 746 return -2; 747 } 748 749 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 750 "invalid encr_type 0x%x", wps->cred.encr_type); 751 return -1; 752 } 753 754 if (wps->wps->cred_cb) { 755 wps->cred.cred_attr = cred - 4; 756 wps->cred.cred_attr_len = cred_len + 4; 757 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 758 wps->cred.cred_attr = NULL; 759 wps->cred.cred_attr_len = 0; 760 } 761 762 return ret; 763 } 764 765 766 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 767 u16 cred_len[], unsigned int num_cred, int wps2) 768 { 769 size_t i; 770 int ok = 0; 771 772 if (wps->wps->ap) 773 return 0; 774 775 if (num_cred == 0) { 776 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 777 "received"); 778 return -1; 779 } 780 781 for (i = 0; i < num_cred; i++) { 782 int res; 783 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 784 if (res == 0) 785 ok++; 786 else if (res == -2) 787 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 788 else 789 return -1; 790 } 791 792 if (ok == 0) { 793 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 794 "received"); 795 return -1; 796 } 797 798 return 0; 799 } 800 801 802 static int wps_process_ap_settings_e(struct wps_data *wps, 803 struct wps_parse_attr *attr, 804 struct wpabuf *attrs, int wps2) 805 { 806 struct wps_credential cred; 807 int ret = 0; 808 809 if (!wps->wps->ap) 810 return 0; 811 812 if (wps_process_ap_settings(attr, &cred) < 0) 813 return -1; 814 815 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 816 "Registrar"); 817 818 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 819 0) { 820 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 821 MACSTR ") does not match with own address (" MACSTR 822 ")", MAC2STR(cred.mac_addr), 823 MAC2STR(wps->wps->dev.mac_addr)); 824 /* 825 * In theory, this could be consider fatal error, but there are 826 * number of deployed implementations using other address here 827 * due to unclarity in the specification. For interoperability 828 * reasons, allow this to be processed since we do not really 829 * use the MAC Address information for anything. 830 */ 831 #ifdef CONFIG_WPS_STRICT 832 if (wps2) { 833 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 834 "MAC Address in AP Settings"); 835 return -1; 836 } 837 #endif /* CONFIG_WPS_STRICT */ 838 } 839 840 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 841 { 842 if (cred.encr_type & WPS_ENCR_WEP) { 843 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 844 "due to WEP configuration"); 845 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 846 return -1; 847 } 848 849 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 850 "invalid encr_type 0x%x", cred.encr_type); 851 return -1; 852 } 853 854 #ifdef CONFIG_WPS_STRICT 855 if (wps2) { 856 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 857 WPS_ENCR_TKIP || 858 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 859 WPS_AUTH_WPAPSK) { 860 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 861 "AP Settings: WPA-Personal/TKIP only"); 862 wps->error_indication = 863 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 864 return -1; 865 } 866 } 867 #endif /* CONFIG_WPS_STRICT */ 868 869 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 870 { 871 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 872 "TKIP+AES"); 873 cred.encr_type |= WPS_ENCR_AES; 874 } 875 876 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 877 WPS_AUTH_WPAPSK) { 878 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 879 "WPAPSK+WPA2PSK"); 880 cred.auth_type |= WPS_AUTH_WPA2PSK; 881 } 882 883 #ifdef CONFIG_NO_TKIP 884 if (cred.encr_type & WPS_ENCR_TKIP) { 885 wpa_printf(MSG_DEBUG, "WPS: Disable encr_type TKIP"); 886 cred.encr_type &= ~WPS_ENCR_TKIP; 887 } 888 if (cred.auth_type & WPS_AUTH_WPAPSK) { 889 wpa_printf(MSG_DEBUG, "WPS: Disable auth_type WPAPSK"); 890 cred.auth_type &= ~WPS_AUTH_WPAPSK; 891 } 892 #endif /* CONFIG_NO_TKIP */ 893 894 if (wps->wps->cred_cb) { 895 cred.cred_attr = wpabuf_head(attrs); 896 cred.cred_attr_len = wpabuf_len(attrs); 897 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 898 } 899 900 return ret; 901 } 902 903 904 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 905 { 906 u16 id; 907 908 if (dev_pw_id == NULL) { 909 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 910 return -1; 911 } 912 913 id = WPA_GET_BE16(dev_pw_id); 914 if (wps->dev_pw_id == id) { 915 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 916 return 0; 917 } 918 919 #ifdef CONFIG_P2P 920 if ((id == DEV_PW_DEFAULT && 921 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 922 (id == DEV_PW_REGISTRAR_SPECIFIED && 923 wps->dev_pw_id == DEV_PW_DEFAULT)) { 924 /* 925 * Common P2P use cases indicate whether the PIN is from the 926 * client or GO using Device Password Id in M1/M2 in a way that 927 * does not look fully compliant with WSC specification. Anyway, 928 * this is deployed and needs to be allowed, so ignore changes 929 * between Registrar-Specified and Default PIN. 930 */ 931 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 932 "change"); 933 return 0; 934 } 935 #endif /* CONFIG_P2P */ 936 937 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 938 "ID from %u to %u", wps->dev_pw_id, id); 939 940 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 941 wpa_printf(MSG_DEBUG, 942 "WPS: Workaround - ignore PBC-to-PIN change"); 943 return 0; 944 } 945 946 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 947 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 948 bin_clear_free(wps->dev_password, wps->dev_password_len); 949 wps->dev_pw_id = wps->alt_dev_pw_id; 950 wps->dev_password = wps->alt_dev_password; 951 wps->dev_password_len = wps->alt_dev_password_len; 952 wps->alt_dev_password = NULL; 953 wps->alt_dev_password_len = 0; 954 return 0; 955 } 956 957 return -1; 958 } 959 960 961 static enum wps_process_res wps_process_m2(struct wps_data *wps, 962 const struct wpabuf *msg, 963 struct wps_parse_attr *attr) 964 { 965 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 966 967 if (wps->state != RECV_M2) { 968 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 969 "receiving M2", wps->state); 970 wps->state = SEND_WSC_NACK; 971 return WPS_CONTINUE; 972 } 973 974 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 975 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 976 wps_process_uuid_r(wps, attr->uuid_r) || 977 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 978 wps->state = SEND_WSC_NACK; 979 return WPS_CONTINUE; 980 } 981 982 /* 983 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 984 * special locked mode is used to allow protocol run up to M7 in order 985 * to support external Registrars that only learn the current AP 986 * configuration without changing it. 987 */ 988 if (wps->wps->ap && 989 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 990 wps->dev_password == NULL)) { 991 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 992 "registration of a new Registrar"); 993 wps->config_error = WPS_CFG_SETUP_LOCKED; 994 wps->state = SEND_WSC_NACK; 995 return WPS_CONTINUE; 996 } 997 998 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 999 wps_process_authenticator(wps, attr->authenticator, msg) || 1000 wps_process_device_attrs(&wps->peer_dev, attr)) { 1001 wps->state = SEND_WSC_NACK; 1002 return WPS_CONTINUE; 1003 } 1004 1005 #ifdef CONFIG_WPS_NFC 1006 if (wps->peer_pubkey_hash_set) { 1007 struct wpabuf *decrypted; 1008 struct wps_parse_attr eattr; 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 decrypt " 1014 "Encrypted Settings attribute"); 1015 wps->state = SEND_WSC_NACK; 1016 return WPS_CONTINUE; 1017 } 1018 1019 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 1020 "Settings attribute"); 1021 if (wps_parse_msg(decrypted, &eattr) < 0 || 1022 wps_process_key_wrap_auth(wps, decrypted, 1023 eattr.key_wrap_auth) || 1024 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1025 eattr.num_cred, attr->version2 != NULL)) { 1026 wpabuf_clear_free(decrypted); 1027 wps->state = SEND_WSC_NACK; 1028 return WPS_CONTINUE; 1029 } 1030 wpabuf_clear_free(decrypted); 1031 1032 wps->state = WPS_MSG_DONE; 1033 return WPS_CONTINUE; 1034 } 1035 #endif /* CONFIG_WPS_NFC */ 1036 1037 wps->state = SEND_M3; 1038 return WPS_CONTINUE; 1039 } 1040 1041 1042 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 1043 struct wps_parse_attr *attr) 1044 { 1045 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1046 1047 if (wps->state != RECV_M2) { 1048 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1049 "receiving M2D", wps->state); 1050 wps->state = SEND_WSC_NACK; 1051 return WPS_CONTINUE; 1052 } 1053 1054 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1055 attr->manufacturer, attr->manufacturer_len); 1056 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1057 attr->model_name, attr->model_name_len); 1058 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1059 attr->model_number, attr->model_number_len); 1060 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1061 attr->serial_number, attr->serial_number_len); 1062 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1063 attr->dev_name, attr->dev_name_len); 1064 1065 if (wps->wps->event_cb) { 1066 union wps_event_data data; 1067 struct wps_event_m2d *m2d = &data.m2d; 1068 os_memset(&data, 0, sizeof(data)); 1069 if (attr->config_methods) 1070 m2d->config_methods = 1071 WPA_GET_BE16(attr->config_methods); 1072 m2d->manufacturer = attr->manufacturer; 1073 m2d->manufacturer_len = attr->manufacturer_len; 1074 m2d->model_name = attr->model_name; 1075 m2d->model_name_len = attr->model_name_len; 1076 m2d->model_number = attr->model_number; 1077 m2d->model_number_len = attr->model_number_len; 1078 m2d->serial_number = attr->serial_number; 1079 m2d->serial_number_len = attr->serial_number_len; 1080 m2d->dev_name = attr->dev_name; 1081 m2d->dev_name_len = attr->dev_name_len; 1082 m2d->primary_dev_type = attr->primary_dev_type; 1083 if (attr->config_error) 1084 m2d->config_error = 1085 WPA_GET_BE16(attr->config_error); 1086 if (attr->dev_password_id) 1087 m2d->dev_password_id = 1088 WPA_GET_BE16(attr->dev_password_id); 1089 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1090 } 1091 1092 wps->state = RECEIVED_M2D; 1093 return WPS_CONTINUE; 1094 } 1095 1096 1097 static enum wps_process_res wps_process_m4(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 M4"); 1105 1106 if (wps->state != RECV_M4) { 1107 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1108 "receiving M4", 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_process_r_hash1(wps, attr->r_hash1) || 1116 wps_process_r_hash2(wps, attr->r_hash2)) { 1117 wps->state = SEND_WSC_NACK; 1118 return WPS_CONTINUE; 1119 } 1120 1121 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1122 attr->encr_settings_len); 1123 if (decrypted == NULL) { 1124 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1125 "Settings attribute"); 1126 wps->state = SEND_WSC_NACK; 1127 return WPS_CONTINUE; 1128 } 1129 1130 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1131 wpabuf_clear_free(decrypted); 1132 wps->state = SEND_WSC_NACK; 1133 return WPS_CONTINUE; 1134 } 1135 1136 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1137 "attribute"); 1138 if (wps_parse_msg(decrypted, &eattr) < 0 || 1139 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1140 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1141 wpabuf_clear_free(decrypted); 1142 wps->state = SEND_WSC_NACK; 1143 return WPS_CONTINUE; 1144 } 1145 wpabuf_clear_free(decrypted); 1146 1147 wps->state = SEND_M5; 1148 return WPS_CONTINUE; 1149 } 1150 1151 1152 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1153 const struct wpabuf *msg, 1154 struct wps_parse_attr *attr) 1155 { 1156 struct wpabuf *decrypted; 1157 struct wps_parse_attr eattr; 1158 1159 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1160 1161 if (wps->state != RECV_M6) { 1162 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1163 "receiving M6", wps->state); 1164 wps->state = SEND_WSC_NACK; 1165 return WPS_CONTINUE; 1166 } 1167 1168 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1169 wps_process_authenticator(wps, attr->authenticator, msg)) { 1170 wps->state = SEND_WSC_NACK; 1171 return WPS_CONTINUE; 1172 } 1173 1174 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1175 attr->encr_settings_len); 1176 if (decrypted == NULL) { 1177 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1178 "Settings attribute"); 1179 wps->state = SEND_WSC_NACK; 1180 return WPS_CONTINUE; 1181 } 1182 1183 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1184 wpabuf_clear_free(decrypted); 1185 wps->state = SEND_WSC_NACK; 1186 return WPS_CONTINUE; 1187 } 1188 1189 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1190 "attribute"); 1191 if (wps_parse_msg(decrypted, &eattr) < 0 || 1192 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1193 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1194 wpabuf_clear_free(decrypted); 1195 wps->state = SEND_WSC_NACK; 1196 return WPS_CONTINUE; 1197 } 1198 wpabuf_clear_free(decrypted); 1199 1200 if (wps->wps->ap) 1201 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1202 NULL); 1203 1204 wps->state = SEND_M7; 1205 return WPS_CONTINUE; 1206 } 1207 1208 1209 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1210 const struct wpabuf *msg, 1211 struct wps_parse_attr *attr) 1212 { 1213 struct wpabuf *decrypted; 1214 struct wps_parse_attr eattr; 1215 1216 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1217 1218 if (wps->state != RECV_M8) { 1219 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1220 "receiving M8", wps->state); 1221 wps->state = SEND_WSC_NACK; 1222 return WPS_CONTINUE; 1223 } 1224 1225 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1226 wps_process_authenticator(wps, attr->authenticator, msg)) { 1227 wps->state = SEND_WSC_NACK; 1228 return WPS_CONTINUE; 1229 } 1230 1231 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1232 /* 1233 * Stop here if special ap_setup_locked == 2 mode allowed the 1234 * protocol to continue beyond M2. This allows ER to learn the 1235 * current AP settings without changing them. 1236 */ 1237 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1238 "registration of a new Registrar"); 1239 wps->config_error = WPS_CFG_SETUP_LOCKED; 1240 wps->state = SEND_WSC_NACK; 1241 return WPS_CONTINUE; 1242 } 1243 1244 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1245 attr->encr_settings_len); 1246 if (decrypted == NULL) { 1247 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1248 "Settings attribute"); 1249 wps->state = SEND_WSC_NACK; 1250 return WPS_CONTINUE; 1251 } 1252 1253 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1254 attr->version2 != NULL) < 0) { 1255 wpabuf_clear_free(decrypted); 1256 wps->state = SEND_WSC_NACK; 1257 return WPS_CONTINUE; 1258 } 1259 1260 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1261 "attribute"); 1262 if (wps_parse_msg(decrypted, &eattr) < 0 || 1263 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1264 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1265 eattr.num_cred, attr->version2 != NULL) || 1266 wps_process_ap_settings_e(wps, &eattr, decrypted, 1267 attr->version2 != NULL)) { 1268 wpabuf_clear_free(decrypted); 1269 wps->state = SEND_WSC_NACK; 1270 return WPS_CONTINUE; 1271 } 1272 wpabuf_clear_free(decrypted); 1273 1274 wps->state = WPS_MSG_DONE; 1275 return WPS_CONTINUE; 1276 } 1277 1278 1279 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1280 const struct wpabuf *msg) 1281 { 1282 struct wps_parse_attr attr; 1283 enum wps_process_res ret = WPS_CONTINUE; 1284 1285 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1286 1287 if (wps_parse_msg(msg, &attr) < 0) 1288 return WPS_FAILURE; 1289 1290 if (attr.enrollee_nonce == NULL || 1291 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1292 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1293 return WPS_FAILURE; 1294 } 1295 1296 if (attr.msg_type == NULL) { 1297 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1298 wps->state = SEND_WSC_NACK; 1299 return WPS_CONTINUE; 1300 } 1301 1302 switch (*attr.msg_type) { 1303 case WPS_M2: 1304 if (wps_validate_m2(msg) < 0) 1305 return WPS_FAILURE; 1306 ret = wps_process_m2(wps, msg, &attr); 1307 break; 1308 case WPS_M2D: 1309 if (wps_validate_m2d(msg) < 0) 1310 return WPS_FAILURE; 1311 ret = wps_process_m2d(wps, &attr); 1312 break; 1313 case WPS_M4: 1314 if (wps_validate_m4(msg) < 0) 1315 return WPS_FAILURE; 1316 ret = wps_process_m4(wps, msg, &attr); 1317 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1318 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1319 wps->error_indication, 1320 wps->peer_dev.mac_addr); 1321 break; 1322 case WPS_M6: 1323 if (wps_validate_m6(msg) < 0) 1324 return WPS_FAILURE; 1325 ret = wps_process_m6(wps, msg, &attr); 1326 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1327 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1328 wps->error_indication, 1329 wps->peer_dev.mac_addr); 1330 break; 1331 case WPS_M8: 1332 if (wps_validate_m8(msg) < 0) 1333 return WPS_FAILURE; 1334 ret = wps_process_m8(wps, msg, &attr); 1335 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1336 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1337 wps->error_indication, 1338 wps->peer_dev.mac_addr); 1339 break; 1340 default: 1341 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1342 *attr.msg_type); 1343 return WPS_FAILURE; 1344 } 1345 1346 /* 1347 * Save a copy of the last message for Authenticator derivation if we 1348 * are continuing. However, skip M2D since it is not authenticated and 1349 * neither is the ACK/NACK response frame. This allows the possibly 1350 * following M2 to be processed correctly by using the previously sent 1351 * M1 in Authenticator derivation. 1352 */ 1353 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1354 /* Save a copy of the last message for Authenticator derivation 1355 */ 1356 wpabuf_free(wps->last_msg); 1357 wps->last_msg = wpabuf_dup(msg); 1358 } 1359 1360 return ret; 1361 } 1362 1363 1364 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1365 const struct wpabuf *msg) 1366 { 1367 struct wps_parse_attr attr; 1368 1369 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1370 1371 if (wps_parse_msg(msg, &attr) < 0) 1372 return WPS_FAILURE; 1373 1374 if (attr.msg_type == NULL) { 1375 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1376 return WPS_FAILURE; 1377 } 1378 1379 if (*attr.msg_type != WPS_WSC_ACK) { 1380 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1381 *attr.msg_type); 1382 return WPS_FAILURE; 1383 } 1384 1385 if (attr.registrar_nonce == NULL || 1386 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1387 { 1388 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1389 return WPS_FAILURE; 1390 } 1391 1392 if (attr.enrollee_nonce == NULL || 1393 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1394 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1395 return WPS_FAILURE; 1396 } 1397 1398 if (wps->state == RECV_ACK && wps->wps->ap) { 1399 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1400 "completed successfully"); 1401 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1402 wps->state = WPS_FINISHED; 1403 return WPS_DONE; 1404 } 1405 1406 return WPS_FAILURE; 1407 } 1408 1409 1410 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1411 const struct wpabuf *msg) 1412 { 1413 struct wps_parse_attr attr; 1414 u16 config_error; 1415 1416 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1417 1418 if (wps_parse_msg(msg, &attr) < 0) 1419 return WPS_FAILURE; 1420 1421 if (attr.msg_type == NULL) { 1422 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1423 return WPS_FAILURE; 1424 } 1425 1426 if (*attr.msg_type != WPS_WSC_NACK) { 1427 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1428 *attr.msg_type); 1429 return WPS_FAILURE; 1430 } 1431 1432 if (attr.registrar_nonce == NULL || 1433 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1434 { 1435 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1436 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1437 attr.registrar_nonce, WPS_NONCE_LEN); 1438 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1439 wps->nonce_r, WPS_NONCE_LEN); 1440 return WPS_FAILURE; 1441 } 1442 1443 if (attr.enrollee_nonce == NULL || 1444 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1445 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1446 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1447 attr.enrollee_nonce, WPS_NONCE_LEN); 1448 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1449 wps->nonce_e, WPS_NONCE_LEN); 1450 return WPS_FAILURE; 1451 } 1452 1453 if (attr.config_error == NULL) { 1454 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1455 "in WSC_NACK"); 1456 return WPS_FAILURE; 1457 } 1458 1459 config_error = WPA_GET_BE16(attr.config_error); 1460 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1461 "Configuration Error %d", config_error); 1462 1463 switch (wps->state) { 1464 case RECV_M4: 1465 wps_fail_event(wps->wps, WPS_M3, config_error, 1466 wps->error_indication, wps->peer_dev.mac_addr); 1467 break; 1468 case RECV_M6: 1469 wps_fail_event(wps->wps, WPS_M5, config_error, 1470 wps->error_indication, wps->peer_dev.mac_addr); 1471 break; 1472 case RECV_M8: 1473 wps_fail_event(wps->wps, WPS_M7, config_error, 1474 wps->error_indication, wps->peer_dev.mac_addr); 1475 break; 1476 default: 1477 break; 1478 } 1479 1480 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1481 * Enrollee is Authenticator */ 1482 wps->state = SEND_WSC_NACK; 1483 1484 return WPS_FAILURE; 1485 } 1486 1487 1488 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1489 enum wsc_op_code op_code, 1490 const struct wpabuf *msg) 1491 { 1492 1493 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1494 "op_code=%d)", 1495 (unsigned long) wpabuf_len(msg), op_code); 1496 1497 if (op_code == WSC_UPnP) { 1498 /* Determine the OpCode based on message type attribute */ 1499 struct wps_parse_attr attr; 1500 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1501 if (*attr.msg_type == WPS_WSC_ACK) 1502 op_code = WSC_ACK; 1503 else if (*attr.msg_type == WPS_WSC_NACK) 1504 op_code = WSC_NACK; 1505 } 1506 } 1507 1508 switch (op_code) { 1509 case WSC_MSG: 1510 case WSC_UPnP: 1511 return wps_process_wsc_msg(wps, msg); 1512 case WSC_ACK: 1513 if (wps_validate_wsc_ack(msg) < 0) 1514 return WPS_FAILURE; 1515 return wps_process_wsc_ack(wps, msg); 1516 case WSC_NACK: 1517 if (wps_validate_wsc_nack(msg) < 0) 1518 return WPS_FAILURE; 1519 return wps_process_wsc_nack(wps, msg); 1520 default: 1521 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1522 return WPS_FAILURE; 1523 } 1524 } 1525