1 /* 2 * Wi-Fi Protected Setup - common functionality 3 * Copyright (c) 2008-2012, 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/aes_wrap.h" 13 #include "crypto/crypto.h" 14 #include "crypto/dh_group5.h" 15 #include "crypto/sha1.h" 16 #include "crypto/sha256.h" 17 #include "crypto/random.h" 18 #include "wps_i.h" 19 20 21 void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len, 22 const char *label, u8 *res, size_t res_len) 23 { 24 u8 i_buf[4], key_bits[4]; 25 const u8 *addr[4]; 26 size_t len[4]; 27 int i, iter; 28 u8 hash[SHA256_MAC_LEN], *opos; 29 size_t left; 30 31 WPA_PUT_BE32(key_bits, res_len * 8); 32 33 addr[0] = i_buf; 34 len[0] = sizeof(i_buf); 35 addr[1] = label_prefix; 36 len[1] = label_prefix_len; 37 addr[2] = (const u8 *) label; 38 len[2] = os_strlen(label); 39 addr[3] = key_bits; 40 len[3] = sizeof(key_bits); 41 42 iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN; 43 opos = res; 44 left = res_len; 45 46 for (i = 1; i <= iter; i++) { 47 WPA_PUT_BE32(i_buf, i); 48 hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash); 49 if (i < iter) { 50 os_memcpy(opos, hash, SHA256_MAC_LEN); 51 opos += SHA256_MAC_LEN; 52 left -= SHA256_MAC_LEN; 53 } else 54 os_memcpy(opos, hash, left); 55 } 56 } 57 58 59 int wps_derive_keys(struct wps_data *wps) 60 { 61 struct wpabuf *pubkey, *dh_shared; 62 u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN]; 63 const u8 *addr[3]; 64 size_t len[3]; 65 u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN]; 66 67 if (wps->dh_privkey == NULL) { 68 wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available"); 69 return -1; 70 } 71 72 pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r; 73 if (pubkey == NULL) { 74 wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available"); 75 return -1; 76 } 77 78 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey); 79 wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey); 80 dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey); 81 dh5_free(wps->dh_ctx); 82 wps->dh_ctx = NULL; 83 dh_shared = wpabuf_zeropad(dh_shared, 192); 84 if (dh_shared == NULL) { 85 wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key"); 86 return -1; 87 } 88 89 /* Own DH private key is not needed anymore */ 90 wpabuf_free(wps->dh_privkey); 91 wps->dh_privkey = NULL; 92 93 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared); 94 95 /* DHKey = SHA-256(g^AB mod p) */ 96 addr[0] = wpabuf_head(dh_shared); 97 len[0] = wpabuf_len(dh_shared); 98 sha256_vector(1, addr, len, dhkey); 99 wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey)); 100 wpabuf_free(dh_shared); 101 102 /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */ 103 addr[0] = wps->nonce_e; 104 len[0] = WPS_NONCE_LEN; 105 addr[1] = wps->mac_addr_e; 106 len[1] = ETH_ALEN; 107 addr[2] = wps->nonce_r; 108 len[2] = WPS_NONCE_LEN; 109 hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk); 110 wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk)); 111 112 wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation", 113 keys, sizeof(keys)); 114 os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN); 115 os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN); 116 os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN, 117 WPS_EMSK_LEN); 118 119 wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey", 120 wps->authkey, WPS_AUTHKEY_LEN); 121 wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey", 122 wps->keywrapkey, WPS_KEYWRAPKEY_LEN); 123 wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN); 124 125 return 0; 126 } 127 128 129 void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd, 130 size_t dev_passwd_len) 131 { 132 u8 hash[SHA256_MAC_LEN]; 133 134 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd, 135 (dev_passwd_len + 1) / 2, hash); 136 os_memcpy(wps->psk1, hash, WPS_PSK_LEN); 137 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, 138 dev_passwd + (dev_passwd_len + 1) / 2, 139 dev_passwd_len / 2, hash); 140 os_memcpy(wps->psk2, hash, WPS_PSK_LEN); 141 142 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password", 143 dev_passwd, dev_passwd_len); 144 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN); 145 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN); 146 } 147 148 149 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr, 150 size_t encr_len) 151 { 152 struct wpabuf *decrypted; 153 const size_t block_size = 16; 154 size_t i; 155 u8 pad; 156 const u8 *pos; 157 158 /* AES-128-CBC */ 159 if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size) 160 { 161 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received"); 162 return NULL; 163 } 164 165 decrypted = wpabuf_alloc(encr_len - block_size); 166 if (decrypted == NULL) 167 return NULL; 168 169 wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len); 170 wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size); 171 if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted), 172 wpabuf_len(decrypted))) { 173 wpabuf_free(decrypted); 174 return NULL; 175 } 176 177 wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings", 178 decrypted); 179 180 pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1; 181 pad = *pos; 182 if (pad > wpabuf_len(decrypted)) { 183 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value"); 184 wpabuf_free(decrypted); 185 return NULL; 186 } 187 for (i = 0; i < pad; i++) { 188 if (*pos-- != pad) { 189 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad " 190 "string"); 191 wpabuf_free(decrypted); 192 return NULL; 193 } 194 } 195 decrypted->used -= pad; 196 197 return decrypted; 198 } 199 200 201 /** 202 * wps_pin_checksum - Compute PIN checksum 203 * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit) 204 * Returns: Checksum digit 205 */ 206 unsigned int wps_pin_checksum(unsigned int pin) 207 { 208 unsigned int accum = 0; 209 while (pin) { 210 accum += 3 * (pin % 10); 211 pin /= 10; 212 accum += pin % 10; 213 pin /= 10; 214 } 215 216 return (10 - accum % 10) % 10; 217 } 218 219 220 /** 221 * wps_pin_valid - Check whether a PIN has a valid checksum 222 * @pin: Eight digit PIN (i.e., including the checksum digit) 223 * Returns: 1 if checksum digit is valid, or 0 if not 224 */ 225 unsigned int wps_pin_valid(unsigned int pin) 226 { 227 return wps_pin_checksum(pin / 10) == (pin % 10); 228 } 229 230 231 /** 232 * wps_generate_pin - Generate a random PIN 233 * Returns: Eight digit PIN (i.e., including the checksum digit) 234 */ 235 unsigned int wps_generate_pin(void) 236 { 237 unsigned int val; 238 239 /* Generate seven random digits for the PIN */ 240 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) { 241 struct os_time now; 242 os_get_time(&now); 243 val = os_random() ^ now.sec ^ now.usec; 244 } 245 val %= 10000000; 246 247 /* Append checksum digit */ 248 return val * 10 + wps_pin_checksum(val); 249 } 250 251 252 int wps_pin_str_valid(const char *pin) 253 { 254 const char *p; 255 size_t len; 256 257 p = pin; 258 while (*p >= '0' && *p <= '9') 259 p++; 260 if (*p != '\0') 261 return 0; 262 263 len = p - pin; 264 return len == 4 || len == 8; 265 } 266 267 268 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg, 269 u16 config_error, u16 error_indication) 270 { 271 union wps_event_data data; 272 273 if (wps->event_cb == NULL) 274 return; 275 276 os_memset(&data, 0, sizeof(data)); 277 data.fail.msg = msg; 278 data.fail.config_error = config_error; 279 data.fail.error_indication = error_indication; 280 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data); 281 } 282 283 284 void wps_success_event(struct wps_context *wps) 285 { 286 if (wps->event_cb == NULL) 287 return; 288 289 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, NULL); 290 } 291 292 293 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part) 294 { 295 union wps_event_data data; 296 297 if (wps->event_cb == NULL) 298 return; 299 300 os_memset(&data, 0, sizeof(data)); 301 data.pwd_auth_fail.enrollee = enrollee; 302 data.pwd_auth_fail.part = part; 303 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data); 304 } 305 306 307 void wps_pbc_overlap_event(struct wps_context *wps) 308 { 309 if (wps->event_cb == NULL) 310 return; 311 312 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL); 313 } 314 315 316 void wps_pbc_timeout_event(struct wps_context *wps) 317 { 318 if (wps->event_cb == NULL) 319 return; 320 321 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL); 322 } 323 324 325 #ifdef CONFIG_WPS_OOB 326 327 struct wpabuf * wps_get_oob_cred(struct wps_context *wps) 328 { 329 struct wps_data data; 330 struct wpabuf *plain; 331 332 plain = wpabuf_alloc(500); 333 if (plain == NULL) { 334 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 335 "credential"); 336 return NULL; 337 } 338 339 os_memset(&data, 0, sizeof(data)); 340 data.wps = wps; 341 data.auth_type = wps->auth_types; 342 data.encr_type = wps->encr_types; 343 if (wps_build_version(plain) || 344 wps_build_cred(&data, plain) || 345 wps_build_wfa_ext(plain, 0, NULL, 0)) { 346 wpabuf_free(plain); 347 return NULL; 348 } 349 350 return plain; 351 } 352 353 354 struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id, 355 const struct wpabuf *pubkey, 356 const struct wpabuf *dev_pw) 357 { 358 struct wpabuf *data; 359 360 data = wpabuf_alloc(200); 361 if (data == NULL) 362 return NULL; 363 364 if (wps_build_version(data) || 365 wps_build_oob_dev_pw(data, dev_pw_id, pubkey, 366 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) || 367 wps_build_wfa_ext(data, 0, NULL, 0)) { 368 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password " 369 "token"); 370 wpabuf_free(data); 371 return NULL; 372 } 373 374 return data; 375 } 376 377 378 static struct wpabuf * wps_get_oob_dev_pwd(struct wps_context *wps) 379 { 380 struct wpabuf *data; 381 382 data = wpabuf_alloc(200); 383 if (data == NULL) { 384 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 385 "device password attribute"); 386 return NULL; 387 } 388 389 wpabuf_free(wps->oob_conf.dev_password); 390 wps->oob_conf.dev_password = 391 wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1); 392 if (wps->oob_conf.dev_password == NULL) { 393 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 394 "device password"); 395 wpabuf_free(data); 396 return NULL; 397 } 398 399 if (wps_build_version(data) || 400 wps_build_oob_dev_password(data, wps) || 401 wps_build_wfa_ext(data, 0, NULL, 0)) { 402 wpa_printf(MSG_ERROR, "WPS: Build OOB device password " 403 "attribute error"); 404 wpabuf_free(data); 405 return NULL; 406 } 407 408 return data; 409 } 410 411 412 static int wps_parse_oob_dev_pwd(struct wps_context *wps, 413 struct wpabuf *data) 414 { 415 struct oob_conf_data *oob_conf = &wps->oob_conf; 416 struct wps_parse_attr attr; 417 const u8 *pos; 418 size_t pw_len; 419 420 if (wps_parse_msg(data, &attr) < 0 || 421 attr.oob_dev_password == NULL) { 422 wpa_printf(MSG_ERROR, "WPS: OOB device password not found"); 423 return -1; 424 } 425 426 pos = attr.oob_dev_password; 427 428 wpabuf_free(oob_conf->pubkey_hash); 429 oob_conf->pubkey_hash = 430 wpabuf_alloc_copy(pos, WPS_OOB_PUBKEY_HASH_LEN); 431 if (oob_conf->pubkey_hash == NULL) { 432 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 433 "public key hash"); 434 return -1; 435 } 436 pos += WPS_OOB_PUBKEY_HASH_LEN; 437 438 wps->oob_dev_pw_id = WPA_GET_BE16(pos); 439 pos += sizeof(wps->oob_dev_pw_id); 440 441 pw_len = attr.oob_dev_password_len - WPS_OOB_PUBKEY_HASH_LEN - 2; 442 oob_conf->dev_password = wpabuf_alloc(pw_len * 2 + 1); 443 if (oob_conf->dev_password == NULL) { 444 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 445 "device password"); 446 return -1; 447 } 448 wpa_snprintf_hex_uppercase(wpabuf_put(oob_conf->dev_password, 449 pw_len * 2 + 1), 450 pw_len * 2 + 1, pos, pw_len); 451 452 return 0; 453 } 454 455 456 int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr) 457 { 458 struct wpabuf msg; 459 size_t i; 460 461 for (i = 0; i < attr->num_cred; i++) { 462 struct wps_credential local_cred; 463 struct wps_parse_attr cattr; 464 465 os_memset(&local_cred, 0, sizeof(local_cred)); 466 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]); 467 if (wps_parse_msg(&msg, &cattr) < 0 || 468 wps_process_cred(&cattr, &local_cred)) { 469 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB " 470 "credential"); 471 return -1; 472 } 473 wps->cred_cb(wps->cb_ctx, &local_cred); 474 } 475 476 return 0; 477 } 478 479 480 static int wps_parse_oob_cred(struct wps_context *wps, struct wpabuf *data) 481 { 482 struct wps_parse_attr attr; 483 484 if (wps_parse_msg(data, &attr) < 0 || attr.num_cred <= 0) { 485 wpa_printf(MSG_ERROR, "WPS: OOB credential not found"); 486 return -1; 487 } 488 489 return wps_oob_use_cred(wps, &attr); 490 } 491 492 493 int wps_process_oob(struct wps_context *wps, struct oob_device_data *oob_dev, 494 int registrar) 495 { 496 struct wpabuf *data; 497 int ret, write_f, oob_method = wps->oob_conf.oob_method; 498 void *oob_priv; 499 500 write_f = oob_method == OOB_METHOD_DEV_PWD_E ? !registrar : registrar; 501 502 oob_priv = oob_dev->init_func(wps, oob_dev, registrar); 503 if (oob_priv == NULL) { 504 wpa_printf(MSG_ERROR, "WPS: Failed to initialize OOB device"); 505 return -1; 506 } 507 508 if (write_f) { 509 if (oob_method == OOB_METHOD_CRED) 510 data = wps_get_oob_cred(wps); 511 else 512 data = wps_get_oob_dev_pwd(wps); 513 514 ret = 0; 515 if (data == NULL || oob_dev->write_func(oob_priv, data) < 0) 516 ret = -1; 517 } else { 518 data = oob_dev->read_func(oob_priv); 519 if (data == NULL) 520 ret = -1; 521 else { 522 if (oob_method == OOB_METHOD_CRED) 523 ret = wps_parse_oob_cred(wps, data); 524 else 525 ret = wps_parse_oob_dev_pwd(wps, data); 526 } 527 } 528 wpabuf_free(data); 529 oob_dev->deinit_func(oob_priv); 530 531 if (ret < 0) { 532 wpa_printf(MSG_ERROR, "WPS: Failed to process OOB data"); 533 return -1; 534 } 535 536 return 0; 537 } 538 539 540 struct oob_device_data * wps_get_oob_device(char *device_type) 541 { 542 #ifdef CONFIG_WPS_UFD 543 if (os_strstr(device_type, "ufd") != NULL) 544 return &oob_ufd_device_data; 545 #endif /* CONFIG_WPS_UFD */ 546 #ifdef CONFIG_WPS_NFC 547 if (os_strstr(device_type, "nfc") != NULL) 548 return &oob_nfc_device_data; 549 #endif /* CONFIG_WPS_NFC */ 550 551 return NULL; 552 } 553 554 555 #ifdef CONFIG_WPS_NFC 556 struct oob_nfc_device_data * wps_get_oob_nfc_device(char *device_name) 557 { 558 if (device_name == NULL) 559 return NULL; 560 #ifdef CONFIG_WPS_NFC_PN531 561 if (os_strstr(device_name, "pn531") != NULL) 562 return &oob_nfc_pn531_device_data; 563 #endif /* CONFIG_WPS_NFC_PN531 */ 564 565 return NULL; 566 } 567 #endif /* CONFIG_WPS_NFC */ 568 569 570 int wps_get_oob_method(char *method) 571 { 572 if (os_strstr(method, "pin-e") != NULL) 573 return OOB_METHOD_DEV_PWD_E; 574 if (os_strstr(method, "pin-r") != NULL) 575 return OOB_METHOD_DEV_PWD_R; 576 if (os_strstr(method, "cred") != NULL) 577 return OOB_METHOD_CRED; 578 return OOB_METHOD_UNKNOWN; 579 } 580 581 #endif /* CONFIG_WPS_OOB */ 582 583 584 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN]) 585 { 586 const char *pos; 587 588 /* <categ>-<OUI>-<subcateg> */ 589 WPA_PUT_BE16(dev_type, atoi(str)); 590 pos = os_strchr(str, '-'); 591 if (pos == NULL) 592 return -1; 593 pos++; 594 if (hexstr2bin(pos, &dev_type[2], 4)) 595 return -1; 596 pos = os_strchr(pos, '-'); 597 if (pos == NULL) 598 return -1; 599 pos++; 600 WPA_PUT_BE16(&dev_type[6], atoi(pos)); 601 602 603 return 0; 604 } 605 606 607 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf, 608 size_t buf_len) 609 { 610 int ret; 611 612 ret = os_snprintf(buf, buf_len, "%u-%08X-%u", 613 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]), 614 WPA_GET_BE16(&dev_type[6])); 615 if (ret < 0 || (unsigned int) ret >= buf_len) 616 return NULL; 617 618 return buf; 619 } 620 621 622 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid) 623 { 624 const u8 *addr[2]; 625 size_t len[2]; 626 u8 hash[SHA1_MAC_LEN]; 627 u8 nsid[16] = { 628 0x52, 0x64, 0x80, 0xf8, 629 0xc9, 0x9b, 630 0x4b, 0xe5, 631 0xa6, 0x55, 632 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84 633 }; 634 635 addr[0] = nsid; 636 len[0] = sizeof(nsid); 637 addr[1] = mac_addr; 638 len[1] = 6; 639 sha1_vector(2, addr, len, hash); 640 os_memcpy(uuid, hash, 16); 641 642 /* Version: 5 = named-based version using SHA-1 */ 643 uuid[6] = (5 << 4) | (uuid[6] & 0x0f); 644 645 /* Variant specified in RFC 4122 */ 646 uuid[8] = 0x80 | (uuid[8] & 0x3f); 647 } 648 649 650 u16 wps_config_methods_str2bin(const char *str) 651 { 652 u16 methods = 0; 653 654 if (str == NULL) { 655 /* Default to enabling methods based on build configuration */ 656 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD; 657 #ifdef CONFIG_WPS2 658 methods |= WPS_CONFIG_VIRT_DISPLAY; 659 #endif /* CONFIG_WPS2 */ 660 #ifdef CONFIG_WPS_UFD 661 methods |= WPS_CONFIG_USBA; 662 #endif /* CONFIG_WPS_UFD */ 663 #ifdef CONFIG_WPS_NFC 664 methods |= WPS_CONFIG_NFC_INTERFACE; 665 #endif /* CONFIG_WPS_NFC */ 666 } else { 667 if (os_strstr(str, "usba")) 668 methods |= WPS_CONFIG_USBA; 669 if (os_strstr(str, "ethernet")) 670 methods |= WPS_CONFIG_ETHERNET; 671 if (os_strstr(str, "label")) 672 methods |= WPS_CONFIG_LABEL; 673 if (os_strstr(str, "display")) 674 methods |= WPS_CONFIG_DISPLAY; 675 if (os_strstr(str, "ext_nfc_token")) 676 methods |= WPS_CONFIG_EXT_NFC_TOKEN; 677 if (os_strstr(str, "int_nfc_token")) 678 methods |= WPS_CONFIG_INT_NFC_TOKEN; 679 if (os_strstr(str, "nfc_interface")) 680 methods |= WPS_CONFIG_NFC_INTERFACE; 681 if (os_strstr(str, "push_button")) 682 methods |= WPS_CONFIG_PUSHBUTTON; 683 if (os_strstr(str, "keypad")) 684 methods |= WPS_CONFIG_KEYPAD; 685 #ifdef CONFIG_WPS2 686 if (os_strstr(str, "virtual_display")) 687 methods |= WPS_CONFIG_VIRT_DISPLAY; 688 if (os_strstr(str, "physical_display")) 689 methods |= WPS_CONFIG_PHY_DISPLAY; 690 if (os_strstr(str, "virtual_push_button")) 691 methods |= WPS_CONFIG_VIRT_PUSHBUTTON; 692 if (os_strstr(str, "physical_push_button")) 693 methods |= WPS_CONFIG_PHY_PUSHBUTTON; 694 #endif /* CONFIG_WPS2 */ 695 } 696 697 return methods; 698 } 699 700 701 struct wpabuf * wps_build_wsc_ack(struct wps_data *wps) 702 { 703 struct wpabuf *msg; 704 705 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK"); 706 707 msg = wpabuf_alloc(1000); 708 if (msg == NULL) 709 return NULL; 710 711 if (wps_build_version(msg) || 712 wps_build_msg_type(msg, WPS_WSC_ACK) || 713 wps_build_enrollee_nonce(wps, msg) || 714 wps_build_registrar_nonce(wps, msg) || 715 wps_build_wfa_ext(msg, 0, NULL, 0)) { 716 wpabuf_free(msg); 717 return NULL; 718 } 719 720 return msg; 721 } 722 723 724 struct wpabuf * wps_build_wsc_nack(struct wps_data *wps) 725 { 726 struct wpabuf *msg; 727 728 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK"); 729 730 msg = wpabuf_alloc(1000); 731 if (msg == NULL) 732 return NULL; 733 734 if (wps_build_version(msg) || 735 wps_build_msg_type(msg, WPS_WSC_NACK) || 736 wps_build_enrollee_nonce(wps, msg) || 737 wps_build_registrar_nonce(wps, msg) || 738 wps_build_config_error(msg, wps->config_error) || 739 wps_build_wfa_ext(msg, 0, NULL, 0)) { 740 wpabuf_free(msg); 741 return NULL; 742 } 743 744 return msg; 745 } 746 747 748 #ifdef CONFIG_WPS_NFC 749 struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey, 750 struct wpabuf **privkey, 751 struct wpabuf **dev_pw) 752 { 753 struct wpabuf *priv = NULL, *pub = NULL, *pw, *ret; 754 void *dh_ctx; 755 u16 val; 756 757 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN); 758 if (pw == NULL) 759 return NULL; 760 761 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN), 762 WPS_OOB_DEVICE_PASSWORD_LEN) || 763 random_get_bytes((u8 *) &val, sizeof(val))) { 764 wpabuf_free(pw); 765 return NULL; 766 } 767 768 dh_ctx = dh5_init(&priv, &pub); 769 if (dh_ctx == NULL) { 770 wpabuf_free(pw); 771 return NULL; 772 } 773 dh5_free(dh_ctx); 774 775 *id = 0x10 + val % 0xfff0; 776 wpabuf_free(*pubkey); 777 *pubkey = pub; 778 wpabuf_free(*privkey); 779 *privkey = priv; 780 wpabuf_free(*dev_pw); 781 *dev_pw = pw; 782 783 ret = wps_build_nfc_pw_token(*id, *pubkey, *dev_pw); 784 if (ndef && ret) { 785 struct wpabuf *tmp; 786 tmp = ndef_build_wifi(ret); 787 wpabuf_free(ret); 788 if (tmp == NULL) 789 return NULL; 790 ret = tmp; 791 } 792 793 return ret; 794 } 795 #endif /* CONFIG_WPS_NFC */ 796
