1 /* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/crypto.h" 13 #include "crypto/sha256.h" 14 #include "crypto/random.h" 15 #include "wps_i.h" 16 #include "wps_dev_attr.h" 17 18 19 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 20 { 21 u8 state; 22 if (wps->wps->ap) 23 state = wps->wps->wps_state; 24 else 25 state = WPS_STATE_NOT_CONFIGURED; 26 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 27 state); 28 wpabuf_put_be16(msg, ATTR_WPS_STATE); 29 wpabuf_put_be16(msg, 1); 30 wpabuf_put_u8(msg, state); 31 return 0; 32 } 33 34 35 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 36 { 37 u8 *hash; 38 const u8 *addr[4]; 39 size_t len[4]; 40 41 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 42 return -1; 43 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 44 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 45 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 46 47 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 48 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 49 "E-Hash derivation"); 50 return -1; 51 } 52 53 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 54 wpabuf_put_be16(msg, ATTR_E_HASH1); 55 wpabuf_put_be16(msg, SHA256_MAC_LEN); 56 hash = wpabuf_put(msg, SHA256_MAC_LEN); 57 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 58 addr[0] = wps->snonce; 59 len[0] = WPS_SECRET_NONCE_LEN; 60 addr[1] = wps->psk1; 61 len[1] = WPS_PSK_LEN; 62 addr[2] = wpabuf_head(wps->dh_pubkey_e); 63 len[2] = wpabuf_len(wps->dh_pubkey_e); 64 addr[3] = wpabuf_head(wps->dh_pubkey_r); 65 len[3] = wpabuf_len(wps->dh_pubkey_r); 66 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 67 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 70 wpabuf_put_be16(msg, ATTR_E_HASH2); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 74 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 75 addr[1] = wps->psk2; 76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 78 79 return 0; 80 } 81 82 83 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 84 { 85 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 86 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 87 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 88 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 89 return 0; 90 } 91 92 93 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 94 { 95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 96 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 99 WPS_SECRET_NONCE_LEN); 100 return 0; 101 } 102 103 104 static struct wpabuf * wps_build_m1(struct wps_data *wps) 105 { 106 struct wpabuf *msg; 107 u16 config_methods; 108 109 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 110 return NULL; 111 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 112 wps->nonce_e, WPS_NONCE_LEN); 113 114 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 115 msg = wpabuf_alloc(1000); 116 if (msg == NULL) 117 return NULL; 118 119 config_methods = wps->wps->config_methods; 120 if (wps->wps->ap && !wps->pbc_in_m1 && 121 (wps->dev_password_len != 0 || 122 (config_methods & WPS_CONFIG_DISPLAY))) { 123 /* 124 * These are the methods that the AP supports as an Enrollee 125 * for adding external Registrars, so remove PushButton. 126 * 127 * As a workaround for Windows 7 mechanism for probing WPS 128 * capabilities from M1, leave PushButton option if no PIN 129 * method is available or if WPS configuration enables PBC 130 * workaround. 131 */ 132 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 133 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 134 WPS_CONFIG_PHY_PUSHBUTTON); 135 } 136 137 if (wps_build_version(msg) || 138 wps_build_msg_type(msg, WPS_M1) || 139 wps_build_uuid_e(msg, wps->uuid_e) || 140 wps_build_mac_addr(msg, wps->mac_addr_e) || 141 wps_build_enrollee_nonce(wps, msg) || 142 wps_build_public_key(wps, msg) || 143 wps_build_auth_type_flags(wps, msg) || 144 wps_build_encr_type_flags(wps, msg) || 145 wps_build_conn_type_flags(wps, msg) || 146 wps_build_config_methods(msg, config_methods) || 147 wps_build_wps_state(wps, msg) || 148 wps_build_device_attrs(&wps->wps->dev, msg) || 149 wps_build_rf_bands(&wps->wps->dev, msg, 150 wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 151 wps_build_assoc_state(wps, msg) || 152 wps_build_dev_password_id(msg, wps->dev_pw_id) || 153 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 154 wps_build_os_version(&wps->wps->dev, msg) || 155 wps_build_wfa_ext(msg, 0, NULL, 0) || 156 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 157 wpabuf_free(msg); 158 return NULL; 159 } 160 161 wps->state = RECV_M2; 162 return msg; 163 } 164 165 166 static struct wpabuf * wps_build_m3(struct wps_data *wps) 167 { 168 struct wpabuf *msg; 169 170 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 171 172 if (wps->dev_password == NULL) { 173 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 174 return NULL; 175 } 176 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 177 178 if (wps->wps->ap && random_pool_ready() != 1) { 179 wpa_printf(MSG_INFO, 180 "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); 181 return NULL; 182 } 183 184 msg = wpabuf_alloc(1000); 185 if (msg == NULL) 186 return NULL; 187 188 if (wps_build_version(msg) || 189 wps_build_msg_type(msg, WPS_M3) || 190 wps_build_registrar_nonce(wps, msg) || 191 wps_build_e_hash(wps, msg) || 192 wps_build_wfa_ext(msg, 0, NULL, 0) || 193 wps_build_authenticator(wps, msg)) { 194 wpabuf_free(msg); 195 return NULL; 196 } 197 198 wps->state = RECV_M4; 199 return msg; 200 } 201 202 203 static struct wpabuf * wps_build_m5(struct wps_data *wps) 204 { 205 struct wpabuf *msg, *plain; 206 207 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 208 209 plain = wpabuf_alloc(200); 210 if (plain == NULL) 211 return NULL; 212 213 msg = wpabuf_alloc(1000); 214 if (msg == NULL) { 215 wpabuf_free(plain); 216 return NULL; 217 } 218 219 if (wps_build_version(msg) || 220 wps_build_msg_type(msg, WPS_M5) || 221 wps_build_registrar_nonce(wps, msg) || 222 wps_build_e_snonce1(wps, plain) || 223 wps_build_key_wrap_auth(wps, plain) || 224 wps_build_encr_settings(wps, msg, plain) || 225 wps_build_wfa_ext(msg, 0, NULL, 0) || 226 wps_build_authenticator(wps, msg)) { 227 wpabuf_free(plain); 228 wpabuf_free(msg); 229 return NULL; 230 } 231 wpabuf_free(plain); 232 233 wps->state = RECV_M6; 234 return msg; 235 } 236 237 238 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 239 { 240 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 241 wpabuf_put_be16(msg, ATTR_SSID); 242 wpabuf_put_be16(msg, wps->wps->ssid_len); 243 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 244 return 0; 245 } 246 247 248 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 249 { 250 u16 auth_type = wps->wps->ap_auth_type; 251 252 /* 253 * Work around issues with Windows 7 WPS implementation not liking 254 * multiple Authentication Type bits in M7 AP Settings attribute by 255 * showing only the most secure option from current configuration. 256 */ 257 if (auth_type & WPS_AUTH_WPA2PSK) 258 auth_type = WPS_AUTH_WPA2PSK; 259 else if (auth_type & WPS_AUTH_WPAPSK) 260 auth_type = WPS_AUTH_WPAPSK; 261 else if (auth_type & WPS_AUTH_OPEN) 262 auth_type = WPS_AUTH_OPEN; 263 264 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 265 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 266 wpabuf_put_be16(msg, 2); 267 wpabuf_put_be16(msg, auth_type); 268 return 0; 269 } 270 271 272 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 273 { 274 u16 encr_type = wps->wps->ap_encr_type; 275 276 /* 277 * Work around issues with Windows 7 WPS implementation not liking 278 * multiple Encryption Type bits in M7 AP Settings attribute by 279 * showing only the most secure option from current configuration. 280 */ 281 if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 282 if (encr_type & WPS_ENCR_AES) 283 encr_type = WPS_ENCR_AES; 284 else if (encr_type & WPS_ENCR_TKIP) 285 encr_type = WPS_ENCR_TKIP; 286 } 287 288 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 289 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 290 wpabuf_put_be16(msg, 2); 291 wpabuf_put_be16(msg, encr_type); 292 return 0; 293 } 294 295 296 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 297 { 298 if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 299 wps->wps->network_key_len == 0) { 300 char hex[65]; 301 u8 psk[32]; 302 /* Generate a random per-device PSK */ 303 if (random_pool_ready() != 1 || 304 random_get_bytes(psk, sizeof(psk)) < 0) { 305 wpa_printf(MSG_INFO, 306 "WPS: Could not generate random PSK"); 307 return -1; 308 } 309 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 310 psk, sizeof(psk)); 311 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 312 (unsigned int) wps->new_psk_len * 2); 313 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 314 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 315 wpabuf_put_be16(msg, sizeof(psk) * 2); 316 wpabuf_put_data(msg, hex, sizeof(psk) * 2); 317 if (wps->wps->registrar) { 318 wps_cb_new_psk(wps->wps->registrar, 319 wps->peer_dev.mac_addr, 320 wps->p2p_dev_addr, psk, sizeof(psk)); 321 } 322 return 0; 323 } 324 325 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 326 (unsigned int) wps->wps->network_key_len); 327 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 328 wpabuf_put_be16(msg, wps->wps->network_key_len); 329 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 330 return 0; 331 } 332 333 334 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 335 { 336 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 337 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 338 wpabuf_put_be16(msg, ETH_ALEN); 339 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 340 return 0; 341 } 342 343 344 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 345 { 346 const u8 *start, *end; 347 int ret; 348 349 if (wps->wps->ap_settings) { 350 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 351 wpabuf_put_data(plain, wps->wps->ap_settings, 352 wps->wps->ap_settings_len); 353 return 0; 354 } 355 356 wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 357 start = wpabuf_put(plain, 0); 358 ret = wps_build_cred_ssid(wps, plain) || 359 wps_build_cred_mac_addr(wps, plain) || 360 wps_build_cred_auth_type(wps, plain) || 361 wps_build_cred_encr_type(wps, plain) || 362 wps_build_cred_network_key(wps, plain); 363 end = wpabuf_put(plain, 0); 364 365 wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 366 start, end - start); 367 368 return ret; 369 } 370 371 372 static struct wpabuf * wps_build_m7(struct wps_data *wps) 373 { 374 struct wpabuf *msg, *plain; 375 376 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 377 378 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 379 if (plain == NULL) 380 return NULL; 381 382 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 383 if (msg == NULL) { 384 wpabuf_free(plain); 385 return NULL; 386 } 387 388 if (wps_build_version(msg) || 389 wps_build_msg_type(msg, WPS_M7) || 390 wps_build_registrar_nonce(wps, msg) || 391 wps_build_e_snonce2(wps, plain) || 392 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 393 wps_build_key_wrap_auth(wps, plain) || 394 wps_build_encr_settings(wps, msg, plain) || 395 wps_build_wfa_ext(msg, 0, NULL, 0) || 396 wps_build_authenticator(wps, msg)) { 397 wpabuf_free(plain); 398 wpabuf_free(msg); 399 return NULL; 400 } 401 wpabuf_free(plain); 402 403 if (wps->wps->ap && wps->wps->registrar) { 404 /* 405 * If the Registrar is only learning our current configuration, 406 * it may not continue protocol run to successful completion. 407 * Store information here to make sure it remains available. 408 */ 409 wps_device_store(wps->wps->registrar, &wps->peer_dev, 410 wps->uuid_r); 411 } 412 413 wps->state = RECV_M8; 414 return msg; 415 } 416 417 418 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 419 { 420 struct wpabuf *msg; 421 422 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 423 424 msg = wpabuf_alloc(1000); 425 if (msg == NULL) 426 return NULL; 427 428 if (wps_build_version(msg) || 429 wps_build_msg_type(msg, WPS_WSC_DONE) || 430 wps_build_enrollee_nonce(wps, msg) || 431 wps_build_registrar_nonce(wps, msg) || 432 wps_build_wfa_ext(msg, 0, NULL, 0)) { 433 wpabuf_free(msg); 434 return NULL; 435 } 436 437 if (wps->wps->ap) 438 wps->state = RECV_ACK; 439 else { 440 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 441 wps->state = WPS_FINISHED; 442 } 443 return msg; 444 } 445 446 447 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 448 enum wsc_op_code *op_code) 449 { 450 struct wpabuf *msg; 451 452 switch (wps->state) { 453 case SEND_M1: 454 msg = wps_build_m1(wps); 455 *op_code = WSC_MSG; 456 break; 457 case SEND_M3: 458 msg = wps_build_m3(wps); 459 *op_code = WSC_MSG; 460 break; 461 case SEND_M5: 462 msg = wps_build_m5(wps); 463 *op_code = WSC_MSG; 464 break; 465 case SEND_M7: 466 msg = wps_build_m7(wps); 467 *op_code = WSC_MSG; 468 break; 469 case RECEIVED_M2D: 470 if (wps->wps->ap) { 471 msg = wps_build_wsc_nack(wps); 472 *op_code = WSC_NACK; 473 break; 474 } 475 msg = wps_build_wsc_ack(wps); 476 *op_code = WSC_ACK; 477 if (msg) { 478 /* Another M2/M2D may be received */ 479 wps->state = RECV_M2; 480 } 481 break; 482 case SEND_WSC_NACK: 483 msg = wps_build_wsc_nack(wps); 484 *op_code = WSC_NACK; 485 break; 486 case WPS_MSG_DONE: 487 msg = wps_build_wsc_done(wps); 488 *op_code = WSC_Done; 489 break; 490 default: 491 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 492 "a message", wps->state); 493 msg = NULL; 494 break; 495 } 496 497 if (*op_code == WSC_MSG && msg) { 498 /* Save a copy of the last message for Authenticator derivation 499 */ 500 wpabuf_free(wps->last_msg); 501 wps->last_msg = wpabuf_dup(msg); 502 } 503 504 return msg; 505 } 506 507 508 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 509 { 510 if (r_nonce == NULL) { 511 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 512 return -1; 513 } 514 515 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 516 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 517 wps->nonce_r, WPS_NONCE_LEN); 518 519 return 0; 520 } 521 522 523 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 524 { 525 if (e_nonce == NULL) { 526 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 527 return -1; 528 } 529 530 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 531 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 532 return -1; 533 } 534 535 return 0; 536 } 537 538 539 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 540 { 541 if (uuid_r == NULL) { 542 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 543 return -1; 544 } 545 546 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 547 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 548 549 return 0; 550 } 551 552 553 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 554 size_t pk_len) 555 { 556 if (pk == NULL || pk_len == 0) { 557 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 558 return -1; 559 } 560 561 if (wps->peer_pubkey_hash_set) { 562 u8 hash[WPS_HASH_LEN]; 563 sha256_vector(1, &pk, &pk_len, hash); 564 if (os_memcmp_const(hash, wps->peer_pubkey_hash, 565 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 566 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 567 wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 568 pk, pk_len); 569 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 570 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 571 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 572 wps->peer_pubkey_hash, 573 WPS_OOB_PUBKEY_HASH_LEN); 574 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 575 return -1; 576 } 577 } 578 579 wpabuf_free(wps->dh_pubkey_r); 580 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 581 if (wps->dh_pubkey_r == NULL) 582 return -1; 583 584 if (wps_derive_keys(wps) < 0) 585 return -1; 586 587 return 0; 588 } 589 590 591 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 592 { 593 if (r_hash1 == NULL) { 594 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 595 return -1; 596 } 597 598 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 599 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 600 601 return 0; 602 } 603 604 605 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 606 { 607 if (r_hash2 == NULL) { 608 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 609 return -1; 610 } 611 612 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 613 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 614 615 return 0; 616 } 617 618 619 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 620 { 621 u8 hash[SHA256_MAC_LEN]; 622 const u8 *addr[4]; 623 size_t len[4]; 624 625 if (r_snonce1 == NULL) { 626 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 627 return -1; 628 } 629 630 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 631 WPS_SECRET_NONCE_LEN); 632 633 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 634 addr[0] = r_snonce1; 635 len[0] = WPS_SECRET_NONCE_LEN; 636 addr[1] = wps->psk1; 637 len[1] = WPS_PSK_LEN; 638 addr[2] = wpabuf_head(wps->dh_pubkey_e); 639 len[2] = wpabuf_len(wps->dh_pubkey_e); 640 addr[3] = wpabuf_head(wps->dh_pubkey_r); 641 len[3] = wpabuf_len(wps->dh_pubkey_r); 642 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 643 644 if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 645 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 646 "not match with the pre-committed value"); 647 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 648 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 649 return -1; 650 } 651 652 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 653 "half of the device password"); 654 655 return 0; 656 } 657 658 659 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 660 { 661 u8 hash[SHA256_MAC_LEN]; 662 const u8 *addr[4]; 663 size_t len[4]; 664 665 if (r_snonce2 == NULL) { 666 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 667 return -1; 668 } 669 670 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 671 WPS_SECRET_NONCE_LEN); 672 673 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 674 addr[0] = r_snonce2; 675 len[0] = WPS_SECRET_NONCE_LEN; 676 addr[1] = wps->psk2; 677 len[1] = WPS_PSK_LEN; 678 addr[2] = wpabuf_head(wps->dh_pubkey_e); 679 len[2] = wpabuf_len(wps->dh_pubkey_e); 680 addr[3] = wpabuf_head(wps->dh_pubkey_r); 681 len[3] = wpabuf_len(wps->dh_pubkey_r); 682 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 683 684 if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 685 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 686 "not match with the pre-committed value"); 687 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 688 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 689 return -1; 690 } 691 692 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 693 "half of the device password"); 694 695 return 0; 696 } 697 698 699 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 700 size_t cred_len, int wps2) 701 { 702 struct wps_parse_attr attr; 703 struct wpabuf msg; 704 int ret = 0; 705 706 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 707 os_memset(&wps->cred, 0, sizeof(wps->cred)); 708 wpabuf_set(&msg, cred, cred_len); 709 if (wps_parse_msg(&msg, &attr) < 0 || 710 wps_process_cred(&attr, &wps->cred)) 711 return -1; 712 713 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 714 0) { 715 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 716 MACSTR ") does not match with own address (" MACSTR 717 ")", MAC2STR(wps->cred.mac_addr), 718 MAC2STR(wps->wps->dev.mac_addr)); 719 /* 720 * In theory, this could be consider fatal error, but there are 721 * number of deployed implementations using other address here 722 * due to unclarity in the specification. For interoperability 723 * reasons, allow this to be processed since we do not really 724 * use the MAC Address information for anything. 725 */ 726 #ifdef CONFIG_WPS_STRICT 727 if (wps2) { 728 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 729 "MAC Address in AP Settings"); 730 return -1; 731 } 732 #endif /* CONFIG_WPS_STRICT */ 733 } 734 735 if (!(wps->cred.encr_type & 736 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 737 if (wps->cred.encr_type & WPS_ENCR_WEP) { 738 wpa_printf(MSG_INFO, "WPS: Reject Credential " 739 "due to WEP configuration"); 740 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 741 return -2; 742 } 743 744 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 745 "invalid encr_type 0x%x", wps->cred.encr_type); 746 return -1; 747 } 748 749 if (wps->wps->cred_cb) { 750 wps->cred.cred_attr = cred - 4; 751 wps->cred.cred_attr_len = cred_len + 4; 752 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 753 wps->cred.cred_attr = NULL; 754 wps->cred.cred_attr_len = 0; 755 } 756 757 return ret; 758 } 759 760 761 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 762 size_t cred_len[], size_t num_cred, int wps2) 763 { 764 size_t i; 765 int ok = 0; 766 767 if (wps->wps->ap) 768 return 0; 769 770 if (num_cred == 0) { 771 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 772 "received"); 773 return -1; 774 } 775 776 for (i = 0; i < num_cred; i++) { 777 int res; 778 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 779 if (res == 0) 780 ok++; 781 else if (res == -2) 782 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 783 else 784 return -1; 785 } 786 787 if (ok == 0) { 788 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 789 "received"); 790 return -1; 791 } 792 793 return 0; 794 } 795 796 797 static int wps_process_ap_settings_e(struct wps_data *wps, 798 struct wps_parse_attr *attr, 799 struct wpabuf *attrs, int wps2) 800 { 801 struct wps_credential cred; 802 803 if (!wps->wps->ap) 804 return 0; 805 806 if (wps_process_ap_settings(attr, &cred) < 0) 807 return -1; 808 809 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 810 "Registrar"); 811 812 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 813 0) { 814 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 815 MACSTR ") does not match with own address (" MACSTR 816 ")", MAC2STR(cred.mac_addr), 817 MAC2STR(wps->wps->dev.mac_addr)); 818 /* 819 * In theory, this could be consider fatal error, but there are 820 * number of deployed implementations using other address here 821 * due to unclarity in the specification. For interoperability 822 * reasons, allow this to be processed since we do not really 823 * use the MAC Address information for anything. 824 */ 825 #ifdef CONFIG_WPS_STRICT 826 if (wps2) { 827 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 828 "MAC Address in AP Settings"); 829 return -1; 830 } 831 #endif /* CONFIG_WPS_STRICT */ 832 } 833 834 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 835 { 836 if (cred.encr_type & WPS_ENCR_WEP) { 837 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 838 "due to WEP configuration"); 839 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 840 return -1; 841 } 842 843 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 844 "invalid encr_type 0x%x", cred.encr_type); 845 return -1; 846 } 847 848 #ifdef CONFIG_WPS_STRICT 849 if (wps2) { 850 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 851 WPS_ENCR_TKIP || 852 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 853 WPS_AUTH_WPAPSK) { 854 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 855 "AP Settings: WPA-Personal/TKIP only"); 856 wps->error_indication = 857 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 858 return -1; 859 } 860 } 861 #endif /* CONFIG_WPS_STRICT */ 862 863 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 864 { 865 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 866 "TKIP+AES"); 867 cred.encr_type |= WPS_ENCR_AES; 868 } 869 870 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 871 WPS_AUTH_WPAPSK) { 872 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 873 "WPAPSK+WPA2PSK"); 874 cred.auth_type |= WPS_AUTH_WPA2PSK; 875 } 876 877 if (wps->wps->cred_cb) { 878 cred.cred_attr = wpabuf_head(attrs); 879 cred.cred_attr_len = wpabuf_len(attrs); 880 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 881 } 882 883 return 0; 884 } 885 886 887 static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 888 { 889 u16 id; 890 891 if (dev_pw_id == NULL) { 892 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 893 return -1; 894 } 895 896 id = WPA_GET_BE16(dev_pw_id); 897 if (wps->dev_pw_id == id) { 898 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 899 return 0; 900 } 901 902 #ifdef CONFIG_P2P 903 if ((id == DEV_PW_DEFAULT && 904 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 905 (id == DEV_PW_REGISTRAR_SPECIFIED && 906 wps->dev_pw_id == DEV_PW_DEFAULT)) { 907 /* 908 * Common P2P use cases indicate whether the PIN is from the 909 * client or GO using Device Password Id in M1/M2 in a way that 910 * does not look fully compliant with WSC specification. Anyway, 911 * this is deployed and needs to be allowed, so ignore changes 912 * between Registrar-Specified and Default PIN. 913 */ 914 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 915 "change"); 916 return 0; 917 } 918 #endif /* CONFIG_P2P */ 919 920 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 921 "ID from %u to %u", wps->dev_pw_id, id); 922 923 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 924 wpa_printf(MSG_DEBUG, 925 "WPS: Workaround - ignore PBC-to-PIN change"); 926 return 0; 927 } 928 929 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 930 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 931 bin_clear_free(wps->dev_password, wps->dev_password_len); 932 wps->dev_pw_id = wps->alt_dev_pw_id; 933 wps->dev_password = wps->alt_dev_password; 934 wps->dev_password_len = wps->alt_dev_password_len; 935 wps->alt_dev_password = NULL; 936 wps->alt_dev_password_len = 0; 937 return 0; 938 } 939 940 return -1; 941 } 942 943 944 static enum wps_process_res wps_process_m2(struct wps_data *wps, 945 const struct wpabuf *msg, 946 struct wps_parse_attr *attr) 947 { 948 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 949 950 if (wps->state != RECV_M2) { 951 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 952 "receiving M2", wps->state); 953 wps->state = SEND_WSC_NACK; 954 return WPS_CONTINUE; 955 } 956 957 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 958 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 959 wps_process_uuid_r(wps, attr->uuid_r) || 960 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 961 wps->state = SEND_WSC_NACK; 962 return WPS_CONTINUE; 963 } 964 965 /* 966 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 967 * special locked mode is used to allow protocol run up to M7 in order 968 * to support external Registrars that only learn the current AP 969 * configuration without changing it. 970 */ 971 if (wps->wps->ap && 972 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 973 wps->dev_password == NULL)) { 974 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 975 "registration of a new Registrar"); 976 wps->config_error = WPS_CFG_SETUP_LOCKED; 977 wps->state = SEND_WSC_NACK; 978 return WPS_CONTINUE; 979 } 980 981 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 982 wps_process_authenticator(wps, attr->authenticator, msg) || 983 wps_process_device_attrs(&wps->peer_dev, attr)) { 984 wps->state = SEND_WSC_NACK; 985 return WPS_CONTINUE; 986 } 987 988 #ifdef CONFIG_WPS_NFC 989 if (wps->peer_pubkey_hash_set) { 990 struct wpabuf *decrypted; 991 struct wps_parse_attr eattr; 992 993 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 994 attr->encr_settings_len); 995 if (decrypted == NULL) { 996 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 997 "Encrypted Settings attribute"); 998 wps->state = SEND_WSC_NACK; 999 return WPS_CONTINUE; 1000 } 1001 1002 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 1003 "Settings attribute"); 1004 if (wps_parse_msg(decrypted, &eattr) < 0 || 1005 wps_process_key_wrap_auth(wps, decrypted, 1006 eattr.key_wrap_auth) || 1007 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1008 eattr.num_cred, attr->version2 != NULL)) { 1009 wpabuf_free(decrypted); 1010 wps->state = SEND_WSC_NACK; 1011 return WPS_CONTINUE; 1012 } 1013 wpabuf_free(decrypted); 1014 1015 wps->state = WPS_MSG_DONE; 1016 return WPS_CONTINUE; 1017 } 1018 #endif /* CONFIG_WPS_NFC */ 1019 1020 wps->state = SEND_M3; 1021 return WPS_CONTINUE; 1022 } 1023 1024 1025 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 1026 struct wps_parse_attr *attr) 1027 { 1028 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1029 1030 if (wps->state != RECV_M2) { 1031 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1032 "receiving M2D", wps->state); 1033 wps->state = SEND_WSC_NACK; 1034 return WPS_CONTINUE; 1035 } 1036 1037 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1038 attr->manufacturer, attr->manufacturer_len); 1039 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1040 attr->model_name, attr->model_name_len); 1041 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1042 attr->model_number, attr->model_number_len); 1043 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1044 attr->serial_number, attr->serial_number_len); 1045 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1046 attr->dev_name, attr->dev_name_len); 1047 1048 if (wps->wps->event_cb) { 1049 union wps_event_data data; 1050 struct wps_event_m2d *m2d = &data.m2d; 1051 os_memset(&data, 0, sizeof(data)); 1052 if (attr->config_methods) 1053 m2d->config_methods = 1054 WPA_GET_BE16(attr->config_methods); 1055 m2d->manufacturer = attr->manufacturer; 1056 m2d->manufacturer_len = attr->manufacturer_len; 1057 m2d->model_name = attr->model_name; 1058 m2d->model_name_len = attr->model_name_len; 1059 m2d->model_number = attr->model_number; 1060 m2d->model_number_len = attr->model_number_len; 1061 m2d->serial_number = attr->serial_number; 1062 m2d->serial_number_len = attr->serial_number_len; 1063 m2d->dev_name = attr->dev_name; 1064 m2d->dev_name_len = attr->dev_name_len; 1065 m2d->primary_dev_type = attr->primary_dev_type; 1066 if (attr->config_error) 1067 m2d->config_error = 1068 WPA_GET_BE16(attr->config_error); 1069 if (attr->dev_password_id) 1070 m2d->dev_password_id = 1071 WPA_GET_BE16(attr->dev_password_id); 1072 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1073 } 1074 1075 wps->state = RECEIVED_M2D; 1076 return WPS_CONTINUE; 1077 } 1078 1079 1080 static enum wps_process_res wps_process_m4(struct wps_data *wps, 1081 const struct wpabuf *msg, 1082 struct wps_parse_attr *attr) 1083 { 1084 struct wpabuf *decrypted; 1085 struct wps_parse_attr eattr; 1086 1087 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1088 1089 if (wps->state != RECV_M4) { 1090 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1091 "receiving M4", wps->state); 1092 wps->state = SEND_WSC_NACK; 1093 return WPS_CONTINUE; 1094 } 1095 1096 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1097 wps_process_authenticator(wps, attr->authenticator, msg) || 1098 wps_process_r_hash1(wps, attr->r_hash1) || 1099 wps_process_r_hash2(wps, attr->r_hash2)) { 1100 wps->state = SEND_WSC_NACK; 1101 return WPS_CONTINUE; 1102 } 1103 1104 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1105 attr->encr_settings_len); 1106 if (decrypted == NULL) { 1107 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1108 "Settings attribute"); 1109 wps->state = SEND_WSC_NACK; 1110 return WPS_CONTINUE; 1111 } 1112 1113 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1114 wpabuf_free(decrypted); 1115 wps->state = SEND_WSC_NACK; 1116 return WPS_CONTINUE; 1117 } 1118 1119 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1120 "attribute"); 1121 if (wps_parse_msg(decrypted, &eattr) < 0 || 1122 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1123 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1124 wpabuf_free(decrypted); 1125 wps->state = SEND_WSC_NACK; 1126 return WPS_CONTINUE; 1127 } 1128 wpabuf_free(decrypted); 1129 1130 wps->state = SEND_M5; 1131 return WPS_CONTINUE; 1132 } 1133 1134 1135 static enum wps_process_res wps_process_m6(struct wps_data *wps, 1136 const struct wpabuf *msg, 1137 struct wps_parse_attr *attr) 1138 { 1139 struct wpabuf *decrypted; 1140 struct wps_parse_attr eattr; 1141 1142 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1143 1144 if (wps->state != RECV_M6) { 1145 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1146 "receiving M6", wps->state); 1147 wps->state = SEND_WSC_NACK; 1148 return WPS_CONTINUE; 1149 } 1150 1151 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1152 wps_process_authenticator(wps, attr->authenticator, msg)) { 1153 wps->state = SEND_WSC_NACK; 1154 return WPS_CONTINUE; 1155 } 1156 1157 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1158 attr->encr_settings_len); 1159 if (decrypted == NULL) { 1160 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1161 "Settings attribute"); 1162 wps->state = SEND_WSC_NACK; 1163 return WPS_CONTINUE; 1164 } 1165 1166 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1167 wpabuf_free(decrypted); 1168 wps->state = SEND_WSC_NACK; 1169 return WPS_CONTINUE; 1170 } 1171 1172 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1173 "attribute"); 1174 if (wps_parse_msg(decrypted, &eattr) < 0 || 1175 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1176 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1177 wpabuf_free(decrypted); 1178 wps->state = SEND_WSC_NACK; 1179 return WPS_CONTINUE; 1180 } 1181 wpabuf_free(decrypted); 1182 1183 if (wps->wps->ap) 1184 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1185 NULL); 1186 1187 wps->state = SEND_M7; 1188 return WPS_CONTINUE; 1189 } 1190 1191 1192 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1193 const struct wpabuf *msg, 1194 struct wps_parse_attr *attr) 1195 { 1196 struct wpabuf *decrypted; 1197 struct wps_parse_attr eattr; 1198 1199 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1200 1201 if (wps->state != RECV_M8) { 1202 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1203 "receiving M8", wps->state); 1204 wps->state = SEND_WSC_NACK; 1205 return WPS_CONTINUE; 1206 } 1207 1208 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1209 wps_process_authenticator(wps, attr->authenticator, msg)) { 1210 wps->state = SEND_WSC_NACK; 1211 return WPS_CONTINUE; 1212 } 1213 1214 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1215 /* 1216 * Stop here if special ap_setup_locked == 2 mode allowed the 1217 * protocol to continue beyond M2. This allows ER to learn the 1218 * current AP settings without changing them. 1219 */ 1220 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1221 "registration of a new Registrar"); 1222 wps->config_error = WPS_CFG_SETUP_LOCKED; 1223 wps->state = SEND_WSC_NACK; 1224 return WPS_CONTINUE; 1225 } 1226 1227 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1228 attr->encr_settings_len); 1229 if (decrypted == NULL) { 1230 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1231 "Settings attribute"); 1232 wps->state = SEND_WSC_NACK; 1233 return WPS_CONTINUE; 1234 } 1235 1236 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1237 attr->version2 != NULL) < 0) { 1238 wpabuf_free(decrypted); 1239 wps->state = SEND_WSC_NACK; 1240 return WPS_CONTINUE; 1241 } 1242 1243 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1244 "attribute"); 1245 if (wps_parse_msg(decrypted, &eattr) < 0 || 1246 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1247 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1248 eattr.num_cred, attr->version2 != NULL) || 1249 wps_process_ap_settings_e(wps, &eattr, decrypted, 1250 attr->version2 != NULL)) { 1251 wpabuf_free(decrypted); 1252 wps->state = SEND_WSC_NACK; 1253 return WPS_CONTINUE; 1254 } 1255 wpabuf_free(decrypted); 1256 1257 wps->state = WPS_MSG_DONE; 1258 return WPS_CONTINUE; 1259 } 1260 1261 1262 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1263 const struct wpabuf *msg) 1264 { 1265 struct wps_parse_attr attr; 1266 enum wps_process_res ret = WPS_CONTINUE; 1267 1268 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1269 1270 if (wps_parse_msg(msg, &attr) < 0) 1271 return WPS_FAILURE; 1272 1273 if (attr.enrollee_nonce == NULL || 1274 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1275 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1276 return WPS_FAILURE; 1277 } 1278 1279 if (attr.msg_type == NULL) { 1280 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1281 wps->state = SEND_WSC_NACK; 1282 return WPS_CONTINUE; 1283 } 1284 1285 switch (*attr.msg_type) { 1286 case WPS_M2: 1287 if (wps_validate_m2(msg) < 0) 1288 return WPS_FAILURE; 1289 ret = wps_process_m2(wps, msg, &attr); 1290 break; 1291 case WPS_M2D: 1292 if (wps_validate_m2d(msg) < 0) 1293 return WPS_FAILURE; 1294 ret = wps_process_m2d(wps, &attr); 1295 break; 1296 case WPS_M4: 1297 if (wps_validate_m4(msg) < 0) 1298 return WPS_FAILURE; 1299 ret = wps_process_m4(wps, msg, &attr); 1300 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1301 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1302 wps->error_indication, 1303 wps->peer_dev.mac_addr); 1304 break; 1305 case WPS_M6: 1306 if (wps_validate_m6(msg) < 0) 1307 return WPS_FAILURE; 1308 ret = wps_process_m6(wps, msg, &attr); 1309 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1310 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1311 wps->error_indication, 1312 wps->peer_dev.mac_addr); 1313 break; 1314 case WPS_M8: 1315 if (wps_validate_m8(msg) < 0) 1316 return WPS_FAILURE; 1317 ret = wps_process_m8(wps, msg, &attr); 1318 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1319 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1320 wps->error_indication, 1321 wps->peer_dev.mac_addr); 1322 break; 1323 default: 1324 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1325 *attr.msg_type); 1326 return WPS_FAILURE; 1327 } 1328 1329 /* 1330 * Save a copy of the last message for Authenticator derivation if we 1331 * are continuing. However, skip M2D since it is not authenticated and 1332 * neither is the ACK/NACK response frame. This allows the possibly 1333 * following M2 to be processed correctly by using the previously sent 1334 * M1 in Authenticator derivation. 1335 */ 1336 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1337 /* Save a copy of the last message for Authenticator derivation 1338 */ 1339 wpabuf_free(wps->last_msg); 1340 wps->last_msg = wpabuf_dup(msg); 1341 } 1342 1343 return ret; 1344 } 1345 1346 1347 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1348 const struct wpabuf *msg) 1349 { 1350 struct wps_parse_attr attr; 1351 1352 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1353 1354 if (wps_parse_msg(msg, &attr) < 0) 1355 return WPS_FAILURE; 1356 1357 if (attr.msg_type == NULL) { 1358 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1359 return WPS_FAILURE; 1360 } 1361 1362 if (*attr.msg_type != WPS_WSC_ACK) { 1363 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1364 *attr.msg_type); 1365 return WPS_FAILURE; 1366 } 1367 1368 if (attr.registrar_nonce == NULL || 1369 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1370 { 1371 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1372 return WPS_FAILURE; 1373 } 1374 1375 if (attr.enrollee_nonce == NULL || 1376 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1377 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1378 return WPS_FAILURE; 1379 } 1380 1381 if (wps->state == RECV_ACK && wps->wps->ap) { 1382 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1383 "completed successfully"); 1384 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1385 wps->state = WPS_FINISHED; 1386 return WPS_DONE; 1387 } 1388 1389 return WPS_FAILURE; 1390 } 1391 1392 1393 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1394 const struct wpabuf *msg) 1395 { 1396 struct wps_parse_attr attr; 1397 u16 config_error; 1398 1399 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1400 1401 if (wps_parse_msg(msg, &attr) < 0) 1402 return WPS_FAILURE; 1403 1404 if (attr.msg_type == NULL) { 1405 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1406 return WPS_FAILURE; 1407 } 1408 1409 if (*attr.msg_type != WPS_WSC_NACK) { 1410 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1411 *attr.msg_type); 1412 return WPS_FAILURE; 1413 } 1414 1415 if (attr.registrar_nonce == NULL || 1416 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1417 { 1418 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1419 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1420 attr.registrar_nonce, WPS_NONCE_LEN); 1421 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1422 wps->nonce_r, WPS_NONCE_LEN); 1423 return WPS_FAILURE; 1424 } 1425 1426 if (attr.enrollee_nonce == NULL || 1427 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1428 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1429 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1430 attr.enrollee_nonce, WPS_NONCE_LEN); 1431 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1432 wps->nonce_e, WPS_NONCE_LEN); 1433 return WPS_FAILURE; 1434 } 1435 1436 if (attr.config_error == NULL) { 1437 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1438 "in WSC_NACK"); 1439 return WPS_FAILURE; 1440 } 1441 1442 config_error = WPA_GET_BE16(attr.config_error); 1443 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1444 "Configuration Error %d", config_error); 1445 1446 switch (wps->state) { 1447 case RECV_M4: 1448 wps_fail_event(wps->wps, WPS_M3, config_error, 1449 wps->error_indication, wps->peer_dev.mac_addr); 1450 break; 1451 case RECV_M6: 1452 wps_fail_event(wps->wps, WPS_M5, config_error, 1453 wps->error_indication, wps->peer_dev.mac_addr); 1454 break; 1455 case RECV_M8: 1456 wps_fail_event(wps->wps, WPS_M7, config_error, 1457 wps->error_indication, wps->peer_dev.mac_addr); 1458 break; 1459 default: 1460 break; 1461 } 1462 1463 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1464 * Enrollee is Authenticator */ 1465 wps->state = SEND_WSC_NACK; 1466 1467 return WPS_FAILURE; 1468 } 1469 1470 1471 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1472 enum wsc_op_code op_code, 1473 const struct wpabuf *msg) 1474 { 1475 1476 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1477 "op_code=%d)", 1478 (unsigned long) wpabuf_len(msg), op_code); 1479 1480 if (op_code == WSC_UPnP) { 1481 /* Determine the OpCode based on message type attribute */ 1482 struct wps_parse_attr attr; 1483 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1484 if (*attr.msg_type == WPS_WSC_ACK) 1485 op_code = WSC_ACK; 1486 else if (*attr.msg_type == WPS_WSC_NACK) 1487 op_code = WSC_NACK; 1488 } 1489 } 1490 1491 switch (op_code) { 1492 case WSC_MSG: 1493 case WSC_UPnP: 1494 return wps_process_wsc_msg(wps, msg); 1495 case WSC_ACK: 1496 if (wps_validate_wsc_ack(msg) < 0) 1497 return WPS_FAILURE; 1498 return wps_process_wsc_ack(wps, msg); 1499 case WSC_NACK: 1500 if (wps_validate_wsc_nack(msg) < 0) 1501 return WPS_FAILURE; 1502 return wps_process_wsc_nack(wps, msg); 1503 default: 1504 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1505 return WPS_FAILURE; 1506 } 1507 } 1508
