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 (!ether_addr_equal(wps->cred.mac_addr, wps->wps->dev.mac_addr)) { 719 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 720 MACSTR ") does not match with own address (" MACSTR 721 ")", MAC2STR(wps->cred.mac_addr), 722 MAC2STR(wps->wps->dev.mac_addr)); 723 /* 724 * In theory, this could be consider fatal error, but there are 725 * number of deployed implementations using other address here 726 * due to unclarity in the specification. For interoperability 727 * reasons, allow this to be processed since we do not really 728 * use the MAC Address information for anything. 729 */ 730 #ifdef CONFIG_WPS_STRICT 731 if (wps2) { 732 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 733 "MAC Address in AP Settings"); 734 return -1; 735 } 736 #endif /* CONFIG_WPS_STRICT */ 737 } 738 739 if (!(wps->cred.encr_type & 740 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 741 if (wps->cred.encr_type & WPS_ENCR_WEP) { 742 wpa_printf(MSG_INFO, "WPS: Reject Credential " 743 "due to WEP configuration"); 744 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 745 return -2; 746 } 747 748 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 749 "invalid encr_type 0x%x", wps->cred.encr_type); 750 return -1; 751 } 752 753 if (wps->wps->cred_cb) { 754 wps->cred.cred_attr = cred - 4; 755 wps->cred.cred_attr_len = cred_len + 4; 756 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 757 wps->cred.cred_attr = NULL; 758 wps->cred.cred_attr_len = 0; 759 } 760 761 return ret; 762 } 763 764 765 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 766 u16 cred_len[], unsigned int num_cred, int wps2) 767 { 768 size_t i; 769 int ok = 0; 770 771 if (wps->wps->ap) 772 return 0; 773 774 if (num_cred == 0) { 775 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 776 "received"); 777 return -1; 778 } 779 780 for (i = 0; i < num_cred; i++) { 781 int res; 782 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 783 if (res == 0) 784 ok++; 785 else if (res == -2) 786 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 787 else 788 return -1; 789 } 790 791 if (ok == 0) { 792 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 793 "received"); 794 return -1; 795 } 796 797 return 0; 798 } 799 800 801 static int wps_process_ap_settings_e(struct wps_data *wps, 802 struct wps_parse_attr *attr, 803 struct wpabuf *attrs, int wps2) 804 { 805 struct wps_credential cred; 806 int ret = 0; 807 808 if (!wps->wps->ap) 809 return 0; 810 811 if (wps_process_ap_settings(attr, &cred) < 0) 812 return -1; 813 814 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 815 "Registrar"); 816 817 if (!ether_addr_equal(cred.mac_addr, wps->wps->dev.mac_addr)) { 818 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 819 MACSTR ") does not match with own address (" MACSTR 820 ")", MAC2STR(cred.mac_addr), 821 MAC2STR(wps->wps->dev.mac_addr)); 822 /* 823 * In theory, this could be consider fatal error, but there are 824 * number of deployed implementations using other address here 825 * due to unclarity in the specification. For interoperability 826 * reasons, allow this to be processed since we do not really 827 * use the MAC Address information for anything. 828 */ 829 #ifdef CONFIG_WPS_STRICT 830 if (wps2) { 831 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 832 "MAC Address in AP Settings"); 833 return -1; 834 } 835 #endif /* CONFIG_WPS_STRICT */ 836 } 837 838 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 839 { 840 if (cred.encr_type & WPS_ENCR_WEP) { 841 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 842 "due to WEP configuration"); 843 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 844 return -1; 845 } 846 847 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 848 "invalid encr_type 0x%x", cred.encr_type); 849 return -1; 850 } 851 852 #ifdef CONFIG_WPS_STRICT 853 if (wps2) { 854 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 855 WPS_ENCR_TKIP || 856 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 857 WPS_AUTH_WPAPSK) { 858 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 859 "AP Settings: WPA-Personal/TKIP only"); 860 wps->error_indication = 861 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 862 return -1; 863 } 864 } 865 #endif /* CONFIG_WPS_STRICT */ 866 867 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 868 { 869 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 870 "TKIP+AES"); 871 cred.encr_type |= WPS_ENCR_AES; 872 } 873 874 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 875 WPS_AUTH_WPAPSK) { 876 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 877 "WPAPSK+WPA2PSK"); 878 cred.auth_type |= WPS_AUTH_WPA2PSK; 879 } 880 881 #ifdef CONFIG_NO_TKIP 882 if (cred.encr_type & WPS_ENCR_TKIP) { 883 wpa_printf(MSG_DEBUG, "WPS: Disable encr_type TKIP"); 884 cred.encr_type &= ~WPS_ENCR_TKIP; 885 } 886 if (cred.auth_type & WPS_AUTH_WPAPSK) { 887 wpa_printf(MSG_DEBUG, "WPS: Disable auth_type WPAPSK"); 888 cred.auth_type &= ~WPS_AUTH_WPAPSK; 889 } 890 #endif /* CONFIG_NO_TKIP */ 891 892 if (wps->wps->cred_cb) { 893 cred.cred_attr = wpabuf_head(attrs); 894 cred.cred_attr_len = wpabuf_len(attrs); 895 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 896 } 897 898 return ret; 899 } 900 901 902 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 903 { 904 u16 id; 905 906 if (dev_pw_id == NULL) { 907 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 908 return -1; 909 } 910 911 id = WPA_GET_BE16(dev_pw_id); 912 if (wps->dev_pw_id == id) { 913 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 914 return 0; 915 } 916 917 #ifdef CONFIG_P2P 918 if ((id == DEV_PW_DEFAULT && 919 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 920 (id == DEV_PW_REGISTRAR_SPECIFIED && 921 wps->dev_pw_id == DEV_PW_DEFAULT)) { 922 /* 923 * Common P2P use cases indicate whether the PIN is from the 924 * client or GO using Device Password Id in M1/M2 in a way that 925 * does not look fully compliant with WSC specification. Anyway, 926 * this is deployed and needs to be allowed, so ignore changes 927 * between Registrar-Specified and Default PIN. 928 */ 929 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 930 "change"); 931 return 0; 932 } 933 #endif /* CONFIG_P2P */ 934 935 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 936 "ID from %u to %u", wps->dev_pw_id, id); 937 938 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 939 wpa_printf(MSG_DEBUG, 940 "WPS: Workaround - ignore PBC-to-PIN change"); 941 return 0; 942 } 943 944 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 945 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 946 bin_clear_free(wps->dev_password, wps->dev_password_len); 947 wps->dev_pw_id = wps->alt_dev_pw_id; 948 wps->dev_password = wps->alt_dev_password; 949 wps->dev_password_len = wps->alt_dev_password_len; 950 wps->alt_dev_password = NULL; 951 wps->alt_dev_password_len = 0; 952 return 0; 953 } 954 955 return -1; 956 } 957 958 959 static enum wps_process_res wps_process_m2(struct wps_data *wps, 960 const struct wpabuf *msg, 961 struct wps_parse_attr *attr) 962 { 963 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 964 965 if (wps->state != RECV_M2) { 966 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 967 "receiving M2", wps->state); 968 wps->state = SEND_WSC_NACK; 969 return WPS_CONTINUE; 970 } 971 972 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 973 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 974 wps_process_uuid_r(wps, attr->uuid_r) || 975 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 976 wps->state = SEND_WSC_NACK; 977 return WPS_CONTINUE; 978 } 979 980 /* 981 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 982 * special locked mode is used to allow protocol run up to M7 in order 983 * to support external Registrars that only learn the current AP 984 * configuration without changing it. 985 */ 986 if (wps->wps->ap && 987 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 988 wps->dev_password == NULL)) { 989 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 990 "registration of a new Registrar"); 991 wps->config_error = WPS_CFG_SETUP_LOCKED; 992 wps->state = SEND_WSC_NACK; 993 return WPS_CONTINUE; 994 } 995 996 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 997 wps_process_authenticator(wps, attr->authenticator, msg) || 998 wps_process_device_attrs(&wps->peer_dev, attr)) { 999 wps->state = SEND_WSC_NACK; 1000 return WPS_CONTINUE; 1001 } 1002 1003 #ifdef CONFIG_WPS_NFC 1004 if (wps->peer_pubkey_hash_set) { 1005 struct wpabuf *decrypted; 1006 struct wps_parse_attr eattr; 1007 1008 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1009 attr->encr_settings_len); 1010 if (decrypted == NULL) { 1011 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 1012 "Encrypted Settings attribute"); 1013 wps->state = SEND_WSC_NACK; 1014 return WPS_CONTINUE; 1015 } 1016 1017 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 1018 "Settings attribute"); 1019 if (wps_parse_msg(decrypted, &eattr) < 0 || 1020 wps_process_key_wrap_auth(wps, decrypted, 1021 eattr.key_wrap_auth) || 1022 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1023 eattr.num_cred, attr->version2 != NULL)) { 1024 wpabuf_clear_free(decrypted); 1025 wps->state = SEND_WSC_NACK; 1026 return WPS_CONTINUE; 1027 } 1028 wpabuf_clear_free(decrypted); 1029 1030 wps->state = WPS_MSG_DONE; 1031 return WPS_CONTINUE; 1032 } 1033 #endif /* CONFIG_WPS_NFC */ 1034 1035 wps->state = SEND_M3; 1036 return WPS_CONTINUE; 1037 } 1038 1039 1040 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 1041 struct wps_parse_attr *attr) 1042 { 1043 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1044 1045 if (wps->state != RECV_M2) { 1046 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1047 "receiving M2D", wps->state); 1048 wps->state = SEND_WSC_NACK; 1049 return WPS_CONTINUE; 1050 } 1051 1052 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1053 attr->manufacturer, attr->manufacturer_len); 1054 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1055 attr->model_name, attr->model_name_len); 1056 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1057 attr->model_number, attr->model_number_len); 1058 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1059 attr->serial_number, attr->serial_number_len); 1060 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1061 attr->dev_name, attr->dev_name_len); 1062 1063 if (wps->wps->event_cb) { 1064 union wps_event_data data; 1065 struct wps_event_m2d *m2d = &data.m2d; 1066 os_memset(&data, 0, sizeof(data)); 1067 if (attr->config_methods) 1068 m2d->config_methods = 1069 WPA_GET_BE16(attr->config_methods); 1070 m2d->manufacturer = attr->manufacturer; 1071 m2d->manufacturer_len = attr->manufacturer_len; 1072 m2d->model_name = attr->model_name; 1073 m2d->model_name_len = attr->model_name_len; 1074 m2d->model_number = attr->model_number; 1075 m2d->model_number_len = attr->model_number_len; 1076 m2d->serial_number = attr->serial_number; 1077 m2d->serial_number_len = attr->serial_number_len; 1078 m2d->dev_name = attr->dev_name; 1079 m2d->dev_name_len = attr->dev_name_len; 1080 m2d->primary_dev_type = attr->primary_dev_type; 1081 if (attr->config_error) 1082 m2d->config_error = 1083 WPA_GET_BE16(attr->config_error); 1084 if (attr->dev_password_id) 1085 m2d->dev_password_id = 1086 WPA_GET_BE16(attr->dev_password_id); 1087 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1088 } 1089 1090 wps->state = RECEIVED_M2D; 1091 return WPS_CONTINUE; 1092 } 1093 1094 1095 static enum wps_process_res wps_process_m4(struct wps_data *wps, 1096 const struct wpabuf *msg, 1097 struct wps_parse_attr *attr) 1098 { 1099 struct wpabuf *decrypted; 1100 struct wps_parse_attr eattr; 1101 1102 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1103 1104 if (wps->state != RECV_M4) { 1105 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1106 "receiving M4", wps->state); 1107 wps->state = SEND_WSC_NACK; 1108 return WPS_CONTINUE; 1109 } 1110 1111 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1112 wps_process_authenticator(wps, attr->authenticator, msg) || 1113 wps_process_r_hash1(wps, attr->r_hash1) || 1114 wps_process_r_hash2(wps, attr->r_hash2)) { 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_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1129 wpabuf_clear_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_snonce1(wps, eattr.r_snonce1)) { 1139 wpabuf_clear_free(decrypted); 1140 wps->state = SEND_WSC_NACK; 1141 return WPS_CONTINUE; 1142 } 1143 wpabuf_clear_free(decrypted); 1144 1145 wps->state = SEND_M5; 1146 return WPS_CONTINUE; 1147 } 1148 1149 1150 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1151 const struct wpabuf *msg, 1152 struct wps_parse_attr *attr) 1153 { 1154 struct wpabuf *decrypted; 1155 struct wps_parse_attr eattr; 1156 1157 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1158 1159 if (wps->state != RECV_M6) { 1160 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1161 "receiving M6", wps->state); 1162 wps->state = SEND_WSC_NACK; 1163 return WPS_CONTINUE; 1164 } 1165 1166 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1167 wps_process_authenticator(wps, attr->authenticator, msg)) { 1168 wps->state = SEND_WSC_NACK; 1169 return WPS_CONTINUE; 1170 } 1171 1172 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1173 attr->encr_settings_len); 1174 if (decrypted == NULL) { 1175 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1176 "Settings attribute"); 1177 wps->state = SEND_WSC_NACK; 1178 return WPS_CONTINUE; 1179 } 1180 1181 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1182 wpabuf_clear_free(decrypted); 1183 wps->state = SEND_WSC_NACK; 1184 return WPS_CONTINUE; 1185 } 1186 1187 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1188 "attribute"); 1189 if (wps_parse_msg(decrypted, &eattr) < 0 || 1190 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1191 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1192 wpabuf_clear_free(decrypted); 1193 wps->state = SEND_WSC_NACK; 1194 return WPS_CONTINUE; 1195 } 1196 wpabuf_clear_free(decrypted); 1197 1198 if (wps->wps->ap) 1199 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1200 NULL); 1201 1202 wps->state = SEND_M7; 1203 return WPS_CONTINUE; 1204 } 1205 1206 1207 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1208 const struct wpabuf *msg, 1209 struct wps_parse_attr *attr) 1210 { 1211 struct wpabuf *decrypted; 1212 struct wps_parse_attr eattr; 1213 1214 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1215 1216 if (wps->state != RECV_M8) { 1217 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1218 "receiving M8", wps->state); 1219 wps->state = SEND_WSC_NACK; 1220 return WPS_CONTINUE; 1221 } 1222 1223 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1224 wps_process_authenticator(wps, attr->authenticator, msg)) { 1225 wps->state = SEND_WSC_NACK; 1226 return WPS_CONTINUE; 1227 } 1228 1229 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1230 /* 1231 * Stop here if special ap_setup_locked == 2 mode allowed the 1232 * protocol to continue beyond M2. This allows ER to learn the 1233 * current AP settings without changing them. 1234 */ 1235 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1236 "registration of a new Registrar"); 1237 wps->config_error = WPS_CFG_SETUP_LOCKED; 1238 wps->state = SEND_WSC_NACK; 1239 return WPS_CONTINUE; 1240 } 1241 1242 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1243 attr->encr_settings_len); 1244 if (decrypted == NULL) { 1245 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1246 "Settings attribute"); 1247 wps->state = SEND_WSC_NACK; 1248 return WPS_CONTINUE; 1249 } 1250 1251 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1252 attr->version2 != NULL) < 0) { 1253 wpabuf_clear_free(decrypted); 1254 wps->state = SEND_WSC_NACK; 1255 return WPS_CONTINUE; 1256 } 1257 1258 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1259 "attribute"); 1260 if (wps_parse_msg(decrypted, &eattr) < 0 || 1261 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1262 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1263 eattr.num_cred, attr->version2 != NULL) || 1264 wps_process_ap_settings_e(wps, &eattr, decrypted, 1265 attr->version2 != NULL)) { 1266 wpabuf_clear_free(decrypted); 1267 wps->state = SEND_WSC_NACK; 1268 return WPS_CONTINUE; 1269 } 1270 wpabuf_clear_free(decrypted); 1271 1272 wps->state = WPS_MSG_DONE; 1273 return WPS_CONTINUE; 1274 } 1275 1276 1277 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1278 const struct wpabuf *msg) 1279 { 1280 struct wps_parse_attr attr; 1281 enum wps_process_res ret = WPS_CONTINUE; 1282 1283 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1284 1285 if (wps_parse_msg(msg, &attr) < 0) 1286 return WPS_FAILURE; 1287 1288 if (attr.enrollee_nonce == NULL || 1289 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1290 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1291 return WPS_FAILURE; 1292 } 1293 1294 if (attr.msg_type == NULL) { 1295 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1296 wps->state = SEND_WSC_NACK; 1297 return WPS_CONTINUE; 1298 } 1299 1300 switch (*attr.msg_type) { 1301 case WPS_M2: 1302 if (wps_validate_m2(msg) < 0) 1303 return WPS_FAILURE; 1304 ret = wps_process_m2(wps, msg, &attr); 1305 break; 1306 case WPS_M2D: 1307 if (wps_validate_m2d(msg) < 0) 1308 return WPS_FAILURE; 1309 ret = wps_process_m2d(wps, &attr); 1310 break; 1311 case WPS_M4: 1312 if (wps_validate_m4(msg) < 0) 1313 return WPS_FAILURE; 1314 ret = wps_process_m4(wps, msg, &attr); 1315 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1316 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1317 wps->error_indication, 1318 wps->peer_dev.mac_addr); 1319 break; 1320 case WPS_M6: 1321 if (wps_validate_m6(msg) < 0) 1322 return WPS_FAILURE; 1323 ret = wps_process_m6(wps, msg, &attr); 1324 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1325 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1326 wps->error_indication, 1327 wps->peer_dev.mac_addr); 1328 break; 1329 case WPS_M8: 1330 if (wps_validate_m8(msg) < 0) 1331 return WPS_FAILURE; 1332 ret = wps_process_m8(wps, msg, &attr); 1333 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1334 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1335 wps->error_indication, 1336 wps->peer_dev.mac_addr); 1337 break; 1338 default: 1339 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1340 *attr.msg_type); 1341 return WPS_FAILURE; 1342 } 1343 1344 /* 1345 * Save a copy of the last message for Authenticator derivation if we 1346 * are continuing. However, skip M2D since it is not authenticated and 1347 * neither is the ACK/NACK response frame. This allows the possibly 1348 * following M2 to be processed correctly by using the previously sent 1349 * M1 in Authenticator derivation. 1350 */ 1351 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1352 /* Save a copy of the last message for Authenticator derivation 1353 */ 1354 wpabuf_free(wps->last_msg); 1355 wps->last_msg = wpabuf_dup(msg); 1356 } 1357 1358 return ret; 1359 } 1360 1361 1362 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1363 const struct wpabuf *msg) 1364 { 1365 struct wps_parse_attr attr; 1366 1367 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1368 1369 if (wps_parse_msg(msg, &attr) < 0) 1370 return WPS_FAILURE; 1371 1372 if (attr.msg_type == NULL) { 1373 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1374 return WPS_FAILURE; 1375 } 1376 1377 if (*attr.msg_type != WPS_WSC_ACK) { 1378 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1379 *attr.msg_type); 1380 return WPS_FAILURE; 1381 } 1382 1383 if (attr.registrar_nonce == NULL || 1384 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1385 { 1386 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1387 return WPS_FAILURE; 1388 } 1389 1390 if (attr.enrollee_nonce == NULL || 1391 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1392 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1393 return WPS_FAILURE; 1394 } 1395 1396 if (wps->state == RECV_ACK && wps->wps->ap) { 1397 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1398 "completed successfully"); 1399 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1400 wps->state = WPS_FINISHED; 1401 return WPS_DONE; 1402 } 1403 1404 return WPS_FAILURE; 1405 } 1406 1407 1408 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1409 const struct wpabuf *msg) 1410 { 1411 struct wps_parse_attr attr; 1412 u16 config_error; 1413 1414 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1415 1416 if (wps_parse_msg(msg, &attr) < 0) 1417 return WPS_FAILURE; 1418 1419 if (attr.msg_type == NULL) { 1420 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1421 return WPS_FAILURE; 1422 } 1423 1424 if (*attr.msg_type != WPS_WSC_NACK) { 1425 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1426 *attr.msg_type); 1427 return WPS_FAILURE; 1428 } 1429 1430 if (attr.registrar_nonce == NULL || 1431 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1432 { 1433 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1434 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1435 attr.registrar_nonce, WPS_NONCE_LEN); 1436 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1437 wps->nonce_r, WPS_NONCE_LEN); 1438 return WPS_FAILURE; 1439 } 1440 1441 if (attr.enrollee_nonce == NULL || 1442 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1443 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1444 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1445 attr.enrollee_nonce, WPS_NONCE_LEN); 1446 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1447 wps->nonce_e, WPS_NONCE_LEN); 1448 return WPS_FAILURE; 1449 } 1450 1451 if (attr.config_error == NULL) { 1452 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1453 "in WSC_NACK"); 1454 return WPS_FAILURE; 1455 } 1456 1457 config_error = WPA_GET_BE16(attr.config_error); 1458 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1459 "Configuration Error %d", config_error); 1460 1461 switch (wps->state) { 1462 case RECV_M4: 1463 wps_fail_event(wps->wps, WPS_M3, config_error, 1464 wps->error_indication, wps->peer_dev.mac_addr); 1465 break; 1466 case RECV_M6: 1467 wps_fail_event(wps->wps, WPS_M5, config_error, 1468 wps->error_indication, wps->peer_dev.mac_addr); 1469 break; 1470 case RECV_M8: 1471 wps_fail_event(wps->wps, WPS_M7, config_error, 1472 wps->error_indication, wps->peer_dev.mac_addr); 1473 break; 1474 default: 1475 break; 1476 } 1477 1478 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1479 * Enrollee is Authenticator */ 1480 wps->state = SEND_WSC_NACK; 1481 1482 return WPS_FAILURE; 1483 } 1484 1485 1486 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1487 enum wsc_op_code op_code, 1488 const struct wpabuf *msg) 1489 { 1490 1491 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1492 "op_code=%d)", 1493 (unsigned long) wpabuf_len(msg), op_code); 1494 1495 if (op_code == WSC_UPnP) { 1496 /* Determine the OpCode based on message type attribute */ 1497 struct wps_parse_attr attr; 1498 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1499 if (*attr.msg_type == WPS_WSC_ACK) 1500 op_code = WSC_ACK; 1501 else if (*attr.msg_type == WPS_WSC_NACK) 1502 op_code = WSC_NACK; 1503 } 1504 } 1505 1506 switch (op_code) { 1507 case WSC_MSG: 1508 case WSC_UPnP: 1509 return wps_process_wsc_msg(wps, msg); 1510 case WSC_ACK: 1511 if (wps_validate_wsc_ack(msg) < 0) 1512 return WPS_FAILURE; 1513 return wps_process_wsc_ack(wps, msg); 1514 case WSC_NACK: 1515 if (wps_validate_wsc_nack(msg) < 0) 1516 return WPS_FAILURE; 1517 return wps_process_wsc_nack(wps, msg); 1518 default: 1519 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1520 return WPS_FAILURE; 1521 } 1522 } 1523