1 /* 2 * Wi-Fi Protected Setup - attribute parsing 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 "wps_defs.h" 13 #include "wps_attr_parse.h" 14 15 #ifndef CONFIG_WPS_STRICT 16 #define WPS_WORKAROUNDS 17 #endif /* CONFIG_WPS_STRICT */ 18 19 20 static int wps_set_vendor_ext_wfa_subelem(struct wps_parse_attr *attr, 21 u8 id, u8 len, const u8 *pos) 22 { 23 wpa_printf(MSG_EXCESSIVE, "WPS: WFA subelement id=%u len=%u", 24 id, len); 25 switch (id) { 26 case WFA_ELEM_VERSION2: 27 if (len != 1) { 28 wpa_printf(MSG_DEBUG, "WPS: Invalid Version2 length " 29 "%u", len); 30 return -1; 31 } 32 attr->version2 = pos; 33 break; 34 case WFA_ELEM_AUTHORIZEDMACS: 35 attr->authorized_macs = pos; 36 attr->authorized_macs_len = len; 37 break; 38 case WFA_ELEM_NETWORK_KEY_SHAREABLE: 39 if (len != 1) { 40 wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key " 41 "Shareable length %u", len); 42 return -1; 43 } 44 attr->network_key_shareable = pos; 45 break; 46 case WFA_ELEM_REQUEST_TO_ENROLL: 47 if (len != 1) { 48 wpa_printf(MSG_DEBUG, "WPS: Invalid Request to Enroll " 49 "length %u", len); 50 return -1; 51 } 52 attr->request_to_enroll = pos; 53 break; 54 case WFA_ELEM_SETTINGS_DELAY_TIME: 55 if (len != 1) { 56 wpa_printf(MSG_DEBUG, "WPS: Invalid Settings Delay " 57 "Time length %u", len); 58 return -1; 59 } 60 attr->settings_delay_time = pos; 61 break; 62 default: 63 wpa_printf(MSG_MSGDUMP, "WPS: Skipped unknown WFA Vendor " 64 "Extension subelement %u", id); 65 break; 66 } 67 68 return 0; 69 } 70 71 72 static int wps_parse_vendor_ext_wfa(struct wps_parse_attr *attr, const u8 *pos, 73 u16 len) 74 { 75 const u8 *end = pos + len; 76 u8 id, elen; 77 78 while (pos + 2 < end) { 79 id = *pos++; 80 elen = *pos++; 81 if (pos + elen > end) 82 break; 83 if (wps_set_vendor_ext_wfa_subelem(attr, id, elen, pos) < 0) 84 return -1; 85 pos += elen; 86 } 87 88 return 0; 89 } 90 91 92 static int wps_parse_vendor_ext(struct wps_parse_attr *attr, const u8 *pos, 93 u16 len) 94 { 95 u32 vendor_id; 96 97 if (len < 3) { 98 wpa_printf(MSG_DEBUG, "WPS: Skip invalid Vendor Extension"); 99 return 0; 100 } 101 102 vendor_id = WPA_GET_BE24(pos); 103 switch (vendor_id) { 104 case WPS_VENDOR_ID_WFA: 105 return wps_parse_vendor_ext_wfa(attr, pos + 3, len - 3); 106 } 107 108 /* Handle unknown vendor extensions */ 109 110 wpa_printf(MSG_MSGDUMP, "WPS: Unknown Vendor Extension (Vendor ID %u)", 111 vendor_id); 112 113 if (len > WPS_MAX_VENDOR_EXT_LEN) { 114 wpa_printf(MSG_DEBUG, "WPS: Too long Vendor Extension (%u)", 115 len); 116 return -1; 117 } 118 119 if (attr->num_vendor_ext >= MAX_WPS_PARSE_VENDOR_EXT) { 120 wpa_printf(MSG_DEBUG, "WPS: Skipped Vendor Extension " 121 "attribute (max %d vendor extensions)", 122 MAX_WPS_PARSE_VENDOR_EXT); 123 return -1; 124 } 125 attr->vendor_ext[attr->num_vendor_ext] = pos; 126 attr->vendor_ext_len[attr->num_vendor_ext] = len; 127 attr->num_vendor_ext++; 128 129 return 0; 130 } 131 132 133 static int wps_set_attr(struct wps_parse_attr *attr, u16 type, 134 const u8 *pos, u16 len) 135 { 136 switch (type) { 137 case ATTR_VERSION: 138 if (len != 1) { 139 wpa_printf(MSG_DEBUG, "WPS: Invalid Version length %u", 140 len); 141 return -1; 142 } 143 attr->version = pos; 144 break; 145 case ATTR_MSG_TYPE: 146 if (len != 1) { 147 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type " 148 "length %u", len); 149 return -1; 150 } 151 attr->msg_type = pos; 152 break; 153 case ATTR_ENROLLEE_NONCE: 154 if (len != WPS_NONCE_LEN) { 155 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce " 156 "length %u", len); 157 return -1; 158 } 159 attr->enrollee_nonce = pos; 160 break; 161 case ATTR_REGISTRAR_NONCE: 162 if (len != WPS_NONCE_LEN) { 163 wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce " 164 "length %u", len); 165 return -1; 166 } 167 attr->registrar_nonce = pos; 168 break; 169 case ATTR_UUID_E: 170 if (len != WPS_UUID_LEN) { 171 wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-E length %u", 172 len); 173 return -1; 174 } 175 attr->uuid_e = pos; 176 break; 177 case ATTR_UUID_R: 178 if (len != WPS_UUID_LEN) { 179 wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-R length %u", 180 len); 181 return -1; 182 } 183 attr->uuid_r = pos; 184 break; 185 case ATTR_AUTH_TYPE_FLAGS: 186 if (len != 2) { 187 wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication " 188 "Type Flags length %u", len); 189 return -1; 190 } 191 attr->auth_type_flags = pos; 192 break; 193 case ATTR_ENCR_TYPE_FLAGS: 194 if (len != 2) { 195 wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption Type " 196 "Flags length %u", len); 197 return -1; 198 } 199 attr->encr_type_flags = pos; 200 break; 201 case ATTR_CONN_TYPE_FLAGS: 202 if (len != 1) { 203 wpa_printf(MSG_DEBUG, "WPS: Invalid Connection Type " 204 "Flags length %u", len); 205 return -1; 206 } 207 attr->conn_type_flags = pos; 208 break; 209 case ATTR_CONFIG_METHODS: 210 if (len != 2) { 211 wpa_printf(MSG_DEBUG, "WPS: Invalid Config Methods " 212 "length %u", len); 213 return -1; 214 } 215 attr->config_methods = pos; 216 break; 217 case ATTR_SELECTED_REGISTRAR_CONFIG_METHODS: 218 if (len != 2) { 219 wpa_printf(MSG_DEBUG, "WPS: Invalid Selected " 220 "Registrar Config Methods length %u", len); 221 return -1; 222 } 223 attr->sel_reg_config_methods = pos; 224 break; 225 case ATTR_PRIMARY_DEV_TYPE: 226 if (len != WPS_DEV_TYPE_LEN) { 227 wpa_printf(MSG_DEBUG, "WPS: Invalid Primary Device " 228 "Type length %u", len); 229 return -1; 230 } 231 attr->primary_dev_type = pos; 232 break; 233 case ATTR_RF_BANDS: 234 if (len != 1) { 235 wpa_printf(MSG_DEBUG, "WPS: Invalid RF Bands length " 236 "%u", len); 237 return -1; 238 } 239 attr->rf_bands = pos; 240 break; 241 case ATTR_ASSOC_STATE: 242 if (len != 2) { 243 wpa_printf(MSG_DEBUG, "WPS: Invalid Association State " 244 "length %u", len); 245 return -1; 246 } 247 attr->assoc_state = pos; 248 break; 249 case ATTR_CONFIG_ERROR: 250 if (len != 2) { 251 wpa_printf(MSG_DEBUG, "WPS: Invalid Configuration " 252 "Error length %u", len); 253 return -1; 254 } 255 attr->config_error = pos; 256 break; 257 case ATTR_DEV_PASSWORD_ID: 258 if (len != 2) { 259 wpa_printf(MSG_DEBUG, "WPS: Invalid Device Password " 260 "ID length %u", len); 261 return -1; 262 } 263 attr->dev_password_id = pos; 264 break; 265 case ATTR_OOB_DEVICE_PASSWORD: 266 if (len < WPS_OOB_PUBKEY_HASH_LEN + 2 || 267 len > WPS_OOB_PUBKEY_HASH_LEN + 2 + 268 WPS_OOB_DEVICE_PASSWORD_LEN || 269 (len < WPS_OOB_PUBKEY_HASH_LEN + 2 + 270 WPS_OOB_DEVICE_PASSWORD_MIN_LEN && 271 WPA_GET_BE16(pos + WPS_OOB_PUBKEY_HASH_LEN) != 272 DEV_PW_NFC_CONNECTION_HANDOVER)) { 273 wpa_printf(MSG_DEBUG, "WPS: Invalid OOB Device " 274 "Password length %u", len); 275 return -1; 276 } 277 attr->oob_dev_password = pos; 278 attr->oob_dev_password_len = len; 279 break; 280 case ATTR_OS_VERSION: 281 if (len != 4) { 282 wpa_printf(MSG_DEBUG, "WPS: Invalid OS Version length " 283 "%u", len); 284 return -1; 285 } 286 attr->os_version = pos; 287 break; 288 case ATTR_WPS_STATE: 289 if (len != 1) { 290 wpa_printf(MSG_DEBUG, "WPS: Invalid Wi-Fi Protected " 291 "Setup State length %u", len); 292 return -1; 293 } 294 attr->wps_state = pos; 295 break; 296 case ATTR_AUTHENTICATOR: 297 if (len != WPS_AUTHENTICATOR_LEN) { 298 wpa_printf(MSG_DEBUG, "WPS: Invalid Authenticator " 299 "length %u", len); 300 return -1; 301 } 302 attr->authenticator = pos; 303 break; 304 case ATTR_R_HASH1: 305 if (len != WPS_HASH_LEN) { 306 wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash1 length %u", 307 len); 308 return -1; 309 } 310 attr->r_hash1 = pos; 311 break; 312 case ATTR_R_HASH2: 313 if (len != WPS_HASH_LEN) { 314 wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash2 length %u", 315 len); 316 return -1; 317 } 318 attr->r_hash2 = pos; 319 break; 320 case ATTR_E_HASH1: 321 if (len != WPS_HASH_LEN) { 322 wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash1 length %u", 323 len); 324 return -1; 325 } 326 attr->e_hash1 = pos; 327 break; 328 case ATTR_E_HASH2: 329 if (len != WPS_HASH_LEN) { 330 wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash2 length %u", 331 len); 332 return -1; 333 } 334 attr->e_hash2 = pos; 335 break; 336 case ATTR_R_SNONCE1: 337 if (len != WPS_SECRET_NONCE_LEN) { 338 wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce1 length " 339 "%u", len); 340 return -1; 341 } 342 attr->r_snonce1 = pos; 343 break; 344 case ATTR_R_SNONCE2: 345 if (len != WPS_SECRET_NONCE_LEN) { 346 wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce2 length " 347 "%u", len); 348 return -1; 349 } 350 attr->r_snonce2 = pos; 351 break; 352 case ATTR_E_SNONCE1: 353 if (len != WPS_SECRET_NONCE_LEN) { 354 wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce1 length " 355 "%u", len); 356 return -1; 357 } 358 attr->e_snonce1 = pos; 359 break; 360 case ATTR_E_SNONCE2: 361 if (len != WPS_SECRET_NONCE_LEN) { 362 wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce2 length " 363 "%u", len); 364 return -1; 365 } 366 attr->e_snonce2 = pos; 367 break; 368 case ATTR_KEY_WRAP_AUTH: 369 if (len != WPS_KWA_LEN) { 370 wpa_printf(MSG_DEBUG, "WPS: Invalid Key Wrap " 371 "Authenticator length %u", len); 372 return -1; 373 } 374 attr->key_wrap_auth = pos; 375 break; 376 case ATTR_AUTH_TYPE: 377 if (len != 2) { 378 wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication " 379 "Type length %u", len); 380 return -1; 381 } 382 attr->auth_type = pos; 383 break; 384 case ATTR_ENCR_TYPE: 385 if (len != 2) { 386 wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption " 387 "Type length %u", len); 388 return -1; 389 } 390 attr->encr_type = pos; 391 break; 392 case ATTR_NETWORK_INDEX: 393 if (len != 1) { 394 wpa_printf(MSG_DEBUG, "WPS: Invalid Network Index " 395 "length %u", len); 396 return -1; 397 } 398 attr->network_idx = pos; 399 break; 400 case ATTR_NETWORK_KEY_INDEX: 401 if (len != 1) { 402 wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key Index " 403 "length %u", len); 404 return -1; 405 } 406 attr->network_key_idx = pos; 407 break; 408 case ATTR_MAC_ADDR: 409 if (len != ETH_ALEN) { 410 wpa_printf(MSG_DEBUG, "WPS: Invalid MAC Address " 411 "length %u", len); 412 return -1; 413 } 414 attr->mac_addr = pos; 415 break; 416 case ATTR_KEY_PROVIDED_AUTO: 417 if (len != 1) { 418 wpa_printf(MSG_DEBUG, "WPS: Invalid Key Provided " 419 "Automatically length %u", len); 420 return -1; 421 } 422 attr->key_prov_auto = pos; 423 break; 424 case ATTR_802_1X_ENABLED: 425 if (len != 1) { 426 wpa_printf(MSG_DEBUG, "WPS: Invalid 802.1X Enabled " 427 "length %u", len); 428 return -1; 429 } 430 attr->dot1x_enabled = pos; 431 break; 432 case ATTR_SELECTED_REGISTRAR: 433 if (len != 1) { 434 wpa_printf(MSG_DEBUG, "WPS: Invalid Selected Registrar" 435 " length %u", len); 436 return -1; 437 } 438 attr->selected_registrar = pos; 439 break; 440 case ATTR_REQUEST_TYPE: 441 if (len != 1) { 442 wpa_printf(MSG_DEBUG, "WPS: Invalid Request Type " 443 "length %u", len); 444 return -1; 445 } 446 attr->request_type = pos; 447 break; 448 case ATTR_RESPONSE_TYPE: 449 if (len != 1) { 450 wpa_printf(MSG_DEBUG, "WPS: Invalid Response Type " 451 "length %u", len); 452 return -1; 453 } 454 attr->response_type = pos; 455 break; 456 case ATTR_MANUFACTURER: 457 attr->manufacturer = pos; 458 attr->manufacturer_len = len; 459 break; 460 case ATTR_MODEL_NAME: 461 attr->model_name = pos; 462 attr->model_name_len = len; 463 break; 464 case ATTR_MODEL_NUMBER: 465 attr->model_number = pos; 466 attr->model_number_len = len; 467 break; 468 case ATTR_SERIAL_NUMBER: 469 attr->serial_number = pos; 470 attr->serial_number_len = len; 471 break; 472 case ATTR_DEV_NAME: 473 attr->dev_name = pos; 474 attr->dev_name_len = len; 475 break; 476 case ATTR_PUBLIC_KEY: 477 attr->public_key = pos; 478 attr->public_key_len = len; 479 break; 480 case ATTR_ENCR_SETTINGS: 481 attr->encr_settings = pos; 482 attr->encr_settings_len = len; 483 break; 484 case ATTR_CRED: 485 if (attr->num_cred >= MAX_CRED_COUNT) { 486 wpa_printf(MSG_DEBUG, "WPS: Skipped Credential " 487 "attribute (max %d credentials)", 488 MAX_CRED_COUNT); 489 break; 490 } 491 attr->cred[attr->num_cred] = pos; 492 attr->cred_len[attr->num_cred] = len; 493 attr->num_cred++; 494 break; 495 case ATTR_SSID: 496 attr->ssid = pos; 497 attr->ssid_len = len; 498 break; 499 case ATTR_NETWORK_KEY: 500 attr->network_key = pos; 501 attr->network_key_len = len; 502 break; 503 case ATTR_EAP_TYPE: 504 attr->eap_type = pos; 505 attr->eap_type_len = len; 506 break; 507 case ATTR_EAP_IDENTITY: 508 attr->eap_identity = pos; 509 attr->eap_identity_len = len; 510 break; 511 case ATTR_AP_SETUP_LOCKED: 512 if (len != 1) { 513 wpa_printf(MSG_DEBUG, "WPS: Invalid AP Setup Locked " 514 "length %u", len); 515 return -1; 516 } 517 attr->ap_setup_locked = pos; 518 break; 519 case ATTR_REQUESTED_DEV_TYPE: 520 if (len != WPS_DEV_TYPE_LEN) { 521 wpa_printf(MSG_DEBUG, "WPS: Invalid Requested Device " 522 "Type length %u", len); 523 return -1; 524 } 525 if (attr->num_req_dev_type >= MAX_REQ_DEV_TYPE_COUNT) { 526 wpa_printf(MSG_DEBUG, "WPS: Skipped Requested Device " 527 "Type attribute (max %u types)", 528 MAX_REQ_DEV_TYPE_COUNT); 529 break; 530 } 531 attr->req_dev_type[attr->num_req_dev_type] = pos; 532 attr->num_req_dev_type++; 533 break; 534 case ATTR_SECONDARY_DEV_TYPE_LIST: 535 if (len > WPS_SEC_DEV_TYPE_MAX_LEN || 536 (len % WPS_DEV_TYPE_LEN) > 0) { 537 wpa_printf(MSG_DEBUG, "WPS: Invalid Secondary Device " 538 "Type length %u", len); 539 return -1; 540 } 541 attr->sec_dev_type_list = pos; 542 attr->sec_dev_type_list_len = len; 543 break; 544 case ATTR_VENDOR_EXT: 545 if (wps_parse_vendor_ext(attr, pos, len) < 0) 546 return -1; 547 break; 548 case ATTR_AP_CHANNEL: 549 if (len != 2) { 550 wpa_printf(MSG_DEBUG, "WPS: Invalid AP Channel " 551 "length %u", len); 552 return -1; 553 } 554 attr->ap_channel = pos; 555 break; 556 default: 557 wpa_printf(MSG_DEBUG, "WPS: Unsupported attribute type 0x%x " 558 "len=%u", type, len); 559 break; 560 } 561 562 return 0; 563 } 564 565 566 int wps_parse_msg(const struct wpabuf *msg, struct wps_parse_attr *attr) 567 { 568 const u8 *pos, *end; 569 u16 type, len; 570 #ifdef WPS_WORKAROUNDS 571 u16 prev_type = 0; 572 #endif /* WPS_WORKAROUNDS */ 573 574 os_memset(attr, 0, sizeof(*attr)); 575 pos = wpabuf_head(msg); 576 end = pos + wpabuf_len(msg); 577 578 while (pos < end) { 579 if (end - pos < 4) { 580 wpa_printf(MSG_DEBUG, "WPS: Invalid message - " 581 "%lu bytes remaining", 582 (unsigned long) (end - pos)); 583 return -1; 584 } 585 586 type = WPA_GET_BE16(pos); 587 pos += 2; 588 len = WPA_GET_BE16(pos); 589 pos += 2; 590 wpa_printf(MSG_EXCESSIVE, "WPS: attr type=0x%x len=%u", 591 type, len); 592 if (len > end - pos) { 593 wpa_printf(MSG_DEBUG, "WPS: Attribute overflow"); 594 wpa_hexdump_buf(MSG_MSGDUMP, "WPS: Message data", msg); 595 #ifdef WPS_WORKAROUNDS 596 /* 597 * Some deployed APs seem to have a bug in encoding of 598 * Network Key attribute in the Credential attribute 599 * where they add an extra octet after the Network Key 600 * attribute at least when open network is being 601 * provisioned. 602 */ 603 if ((type & 0xff00) != 0x1000 && 604 prev_type == ATTR_NETWORK_KEY) { 605 wpa_printf(MSG_DEBUG, "WPS: Workaround - try " 606 "to skip unexpected octet after " 607 "Network Key"); 608 pos -= 3; 609 continue; 610 } 611 #endif /* WPS_WORKAROUNDS */ 612 return -1; 613 } 614 615 #ifdef WPS_WORKAROUNDS 616 if (type == 0 && len == 0) { 617 /* 618 * Mac OS X 10.6 seems to be adding 0x00 padding to the 619 * end of M1. Skip those to avoid interop issues. 620 */ 621 int i; 622 for (i = 0; i < end - pos; i++) { 623 if (pos[i]) 624 break; 625 } 626 if (i == end - pos) { 627 wpa_printf(MSG_DEBUG, "WPS: Workaround - skip " 628 "unexpected message padding"); 629 break; 630 } 631 } 632 #endif /* WPS_WORKAROUNDS */ 633 634 if (wps_set_attr(attr, type, pos, len) < 0) 635 return -1; 636 637 #ifdef WPS_WORKAROUNDS 638 prev_type = type; 639 #endif /* WPS_WORKAROUNDS */ 640 pos += len; 641 } 642 643 return 0; 644 } 645