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 "common/defs.h" 13 #include "common/ieee802_11_common.h" 14 #include "crypto/aes_wrap.h" 15 #include "crypto/crypto.h" 16 #include "crypto/dh_group5.h" 17 #include "crypto/sha1.h" 18 #include "crypto/sha256.h" 19 #include "crypto/random.h" 20 #include "wps_i.h" 21 #include "wps_dev_attr.h" 22 23 24 void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len, 25 const char *label, u8 *res, size_t res_len) 26 { 27 u8 i_buf[4], key_bits[4]; 28 const u8 *addr[4]; 29 size_t len[4]; 30 int i, iter; 31 u8 hash[SHA256_MAC_LEN], *opos; 32 size_t left; 33 34 WPA_PUT_BE32(key_bits, res_len * 8); 35 36 addr[0] = i_buf; 37 len[0] = sizeof(i_buf); 38 addr[1] = label_prefix; 39 len[1] = label_prefix_len; 40 addr[2] = (const u8 *) label; 41 len[2] = os_strlen(label); 42 addr[3] = key_bits; 43 len[3] = sizeof(key_bits); 44 45 iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN; 46 opos = res; 47 left = res_len; 48 49 for (i = 1; i <= iter; i++) { 50 WPA_PUT_BE32(i_buf, i); 51 hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash); 52 if (i < iter) { 53 os_memcpy(opos, hash, SHA256_MAC_LEN); 54 opos += SHA256_MAC_LEN; 55 left -= SHA256_MAC_LEN; 56 } else 57 os_memcpy(opos, hash, left); 58 } 59 } 60 61 62 int wps_derive_keys(struct wps_data *wps) 63 { 64 struct wpabuf *pubkey, *dh_shared; 65 u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN]; 66 const u8 *addr[3]; 67 size_t len[3]; 68 u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN]; 69 70 if (wps->dh_privkey == NULL) { 71 wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available"); 72 return -1; 73 } 74 75 pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r; 76 if (pubkey == NULL) { 77 wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available"); 78 return -1; 79 } 80 81 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey); 82 wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey); 83 dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey); 84 dh5_free(wps->dh_ctx); 85 wps->dh_ctx = NULL; 86 dh_shared = wpabuf_zeropad(dh_shared, 192); 87 if (dh_shared == NULL) { 88 wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key"); 89 return -1; 90 } 91 92 /* Own DH private key is not needed anymore */ 93 wpabuf_free(wps->dh_privkey); 94 wps->dh_privkey = NULL; 95 96 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared); 97 98 /* DHKey = SHA-256(g^AB mod p) */ 99 addr[0] = wpabuf_head(dh_shared); 100 len[0] = wpabuf_len(dh_shared); 101 sha256_vector(1, addr, len, dhkey); 102 wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey)); 103 wpabuf_free(dh_shared); 104 105 /* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */ 106 addr[0] = wps->nonce_e; 107 len[0] = WPS_NONCE_LEN; 108 addr[1] = wps->mac_addr_e; 109 len[1] = ETH_ALEN; 110 addr[2] = wps->nonce_r; 111 len[2] = WPS_NONCE_LEN; 112 hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk); 113 wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk)); 114 115 wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation", 116 keys, sizeof(keys)); 117 os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN); 118 os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN); 119 os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN, 120 WPS_EMSK_LEN); 121 122 wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey", 123 wps->authkey, WPS_AUTHKEY_LEN); 124 wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey", 125 wps->keywrapkey, WPS_KEYWRAPKEY_LEN); 126 wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN); 127 128 return 0; 129 } 130 131 132 void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd, 133 size_t dev_passwd_len) 134 { 135 u8 hash[SHA256_MAC_LEN]; 136 137 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd, 138 (dev_passwd_len + 1) / 2, hash); 139 os_memcpy(wps->psk1, hash, WPS_PSK_LEN); 140 hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, 141 dev_passwd + (dev_passwd_len + 1) / 2, 142 dev_passwd_len / 2, hash); 143 os_memcpy(wps->psk2, hash, WPS_PSK_LEN); 144 145 wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password", 146 dev_passwd, dev_passwd_len); 147 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN); 148 wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN); 149 } 150 151 152 struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr, 153 size_t encr_len) 154 { 155 struct wpabuf *decrypted; 156 const size_t block_size = 16; 157 size_t i; 158 u8 pad; 159 const u8 *pos; 160 161 /* AES-128-CBC */ 162 if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size) 163 { 164 wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received"); 165 return NULL; 166 } 167 168 decrypted = wpabuf_alloc(encr_len - block_size); 169 if (decrypted == NULL) 170 return NULL; 171 172 wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len); 173 wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size); 174 if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted), 175 wpabuf_len(decrypted))) { 176 wpabuf_free(decrypted); 177 return NULL; 178 } 179 180 wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings", 181 decrypted); 182 183 pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1; 184 pad = *pos; 185 if (pad > wpabuf_len(decrypted)) { 186 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value"); 187 wpabuf_free(decrypted); 188 return NULL; 189 } 190 for (i = 0; i < pad; i++) { 191 if (*pos-- != pad) { 192 wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad " 193 "string"); 194 wpabuf_free(decrypted); 195 return NULL; 196 } 197 } 198 decrypted->used -= pad; 199 200 return decrypted; 201 } 202 203 204 /** 205 * wps_pin_checksum - Compute PIN checksum 206 * @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit) 207 * Returns: Checksum digit 208 */ 209 unsigned int wps_pin_checksum(unsigned int pin) 210 { 211 unsigned int accum = 0; 212 while (pin) { 213 accum += 3 * (pin % 10); 214 pin /= 10; 215 accum += pin % 10; 216 pin /= 10; 217 } 218 219 return (10 - accum % 10) % 10; 220 } 221 222 223 /** 224 * wps_pin_valid - Check whether a PIN has a valid checksum 225 * @pin: Eight digit PIN (i.e., including the checksum digit) 226 * Returns: 1 if checksum digit is valid, or 0 if not 227 */ 228 unsigned int wps_pin_valid(unsigned int pin) 229 { 230 return wps_pin_checksum(pin / 10) == (pin % 10); 231 } 232 233 234 /** 235 * wps_generate_pin - Generate a random PIN 236 * Returns: Eight digit PIN (i.e., including the checksum digit) 237 */ 238 unsigned int wps_generate_pin(void) 239 { 240 unsigned int val; 241 242 /* Generate seven random digits for the PIN */ 243 if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) { 244 struct os_time now; 245 os_get_time(&now); 246 val = os_random() ^ now.sec ^ now.usec; 247 } 248 val %= 10000000; 249 250 /* Append checksum digit */ 251 return val * 10 + wps_pin_checksum(val); 252 } 253 254 255 int wps_pin_str_valid(const char *pin) 256 { 257 const char *p; 258 size_t len; 259 260 p = pin; 261 while (*p >= '0' && *p <= '9') 262 p++; 263 if (*p != '\0') 264 return 0; 265 266 len = p - pin; 267 return len == 4 || len == 8; 268 } 269 270 271 void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg, 272 u16 config_error, u16 error_indication, const u8 *mac_addr) 273 { 274 union wps_event_data data; 275 276 if (wps->event_cb == NULL) 277 return; 278 279 os_memset(&data, 0, sizeof(data)); 280 data.fail.msg = msg; 281 data.fail.config_error = config_error; 282 data.fail.error_indication = error_indication; 283 os_memcpy(data.fail.peer_macaddr, mac_addr, ETH_ALEN); 284 wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data); 285 } 286 287 288 void wps_success_event(struct wps_context *wps, const u8 *mac_addr) 289 { 290 union wps_event_data data; 291 292 if (wps->event_cb == NULL) 293 return; 294 295 os_memset(&data, 0, sizeof(data)); 296 os_memcpy(data.success.peer_macaddr, mac_addr, ETH_ALEN); 297 wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, &data); 298 } 299 300 301 void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part, 302 const u8 *mac_addr) 303 { 304 union wps_event_data data; 305 306 if (wps->event_cb == NULL) 307 return; 308 309 os_memset(&data, 0, sizeof(data)); 310 data.pwd_auth_fail.enrollee = enrollee; 311 data.pwd_auth_fail.part = part; 312 os_memcpy(data.pwd_auth_fail.peer_macaddr, mac_addr, ETH_ALEN); 313 wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data); 314 } 315 316 317 void wps_pbc_overlap_event(struct wps_context *wps) 318 { 319 if (wps->event_cb == NULL) 320 return; 321 322 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL); 323 } 324 325 326 void wps_pbc_timeout_event(struct wps_context *wps) 327 { 328 if (wps->event_cb == NULL) 329 return; 330 331 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL); 332 } 333 334 335 void wps_pbc_active_event(struct wps_context *wps) 336 { 337 if (wps->event_cb == NULL) 338 return; 339 340 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_ACTIVE, NULL); 341 } 342 343 344 void wps_pbc_disable_event(struct wps_context *wps) 345 { 346 if (wps->event_cb == NULL) 347 return; 348 349 wps->event_cb(wps->cb_ctx, WPS_EV_PBC_DISABLE, NULL); 350 } 351 352 353 #ifdef CONFIG_WPS_OOB 354 355 struct wpabuf * wps_get_oob_cred(struct wps_context *wps, int rf_band, 356 int channel) 357 { 358 struct wps_data data; 359 struct wpabuf *plain; 360 361 plain = wpabuf_alloc(500); 362 if (plain == NULL) { 363 wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB " 364 "credential"); 365 return NULL; 366 } 367 368 os_memset(&data, 0, sizeof(data)); 369 data.wps = wps; 370 data.auth_type = wps->auth_types; 371 data.encr_type = wps->encr_types; 372 if (wps_build_cred(&data, plain) || 373 (rf_band && wps_build_rf_bands_attr(plain, rf_band)) || 374 (channel && wps_build_ap_channel(plain, channel)) || 375 wps_build_mac_addr(plain, wps->dev.mac_addr) || 376 wps_build_wfa_ext(plain, 0, NULL, 0)) { 377 os_free(data.new_psk); 378 wpabuf_free(plain); 379 return NULL; 380 } 381 382 if (wps->wps_state == WPS_STATE_NOT_CONFIGURED && data.new_psk && 383 wps->ap) { 384 struct wps_credential cred; 385 386 wpa_printf(MSG_DEBUG, "WPS: Moving to Configured state based " 387 "on credential token generation"); 388 389 os_memset(&cred, 0, sizeof(cred)); 390 os_memcpy(cred.ssid, wps->ssid, wps->ssid_len); 391 cred.ssid_len = wps->ssid_len; 392 cred.auth_type = WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK; 393 cred.encr_type = WPS_ENCR_TKIP | WPS_ENCR_AES; 394 os_memcpy(cred.key, data.new_psk, data.new_psk_len); 395 cred.key_len = data.new_psk_len; 396 397 wps->wps_state = WPS_STATE_CONFIGURED; 398 wpa_hexdump_ascii_key(MSG_DEBUG, 399 "WPS: Generated random passphrase", 400 data.new_psk, data.new_psk_len); 401 if (wps->cred_cb) 402 wps->cred_cb(wps->cb_ctx, &cred); 403 } 404 405 os_free(data.new_psk); 406 407 return plain; 408 } 409 410 411 struct wpabuf * wps_build_nfc_pw_token(u16 dev_pw_id, 412 const struct wpabuf *pubkey, 413 const struct wpabuf *dev_pw) 414 { 415 struct wpabuf *data; 416 417 data = wpabuf_alloc(200); 418 if (data == NULL) 419 return NULL; 420 421 if (wps_build_oob_dev_pw(data, dev_pw_id, pubkey, 422 wpabuf_head(dev_pw), wpabuf_len(dev_pw)) || 423 wps_build_wfa_ext(data, 0, NULL, 0)) { 424 wpa_printf(MSG_ERROR, "WPS: Failed to build NFC password " 425 "token"); 426 wpabuf_free(data); 427 return NULL; 428 } 429 430 return data; 431 } 432 433 434 int wps_oob_use_cred(struct wps_context *wps, struct wps_parse_attr *attr) 435 { 436 struct wpabuf msg; 437 size_t i; 438 439 for (i = 0; i < attr->num_cred; i++) { 440 struct wps_credential local_cred; 441 struct wps_parse_attr cattr; 442 443 os_memset(&local_cred, 0, sizeof(local_cred)); 444 wpabuf_set(&msg, attr->cred[i], attr->cred_len[i]); 445 if (wps_parse_msg(&msg, &cattr) < 0 || 446 wps_process_cred(&cattr, &local_cred)) { 447 wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB " 448 "credential"); 449 return -1; 450 } 451 wps->cred_cb(wps->cb_ctx, &local_cred); 452 } 453 454 return 0; 455 } 456 457 458 #endif /* CONFIG_WPS_OOB */ 459 460 461 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN]) 462 { 463 const char *pos; 464 465 /* <categ>-<OUI>-<subcateg> */ 466 WPA_PUT_BE16(dev_type, atoi(str)); 467 pos = os_strchr(str, '-'); 468 if (pos == NULL) 469 return -1; 470 pos++; 471 if (hexstr2bin(pos, &dev_type[2], 4)) 472 return -1; 473 pos = os_strchr(pos, '-'); 474 if (pos == NULL) 475 return -1; 476 pos++; 477 WPA_PUT_BE16(&dev_type[6], atoi(pos)); 478 479 480 return 0; 481 } 482 483 484 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf, 485 size_t buf_len) 486 { 487 int ret; 488 489 ret = os_snprintf(buf, buf_len, "%u-%08X-%u", 490 WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]), 491 WPA_GET_BE16(&dev_type[6])); 492 if (ret < 0 || (unsigned int) ret >= buf_len) 493 return NULL; 494 495 return buf; 496 } 497 498 499 void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid) 500 { 501 const u8 *addr[2]; 502 size_t len[2]; 503 u8 hash[SHA1_MAC_LEN]; 504 u8 nsid[16] = { 505 0x52, 0x64, 0x80, 0xf8, 506 0xc9, 0x9b, 507 0x4b, 0xe5, 508 0xa6, 0x55, 509 0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84 510 }; 511 512 addr[0] = nsid; 513 len[0] = sizeof(nsid); 514 addr[1] = mac_addr; 515 len[1] = 6; 516 sha1_vector(2, addr, len, hash); 517 os_memcpy(uuid, hash, 16); 518 519 /* Version: 5 = named-based version using SHA-1 */ 520 uuid[6] = (5 << 4) | (uuid[6] & 0x0f); 521 522 /* Variant specified in RFC 4122 */ 523 uuid[8] = 0x80 | (uuid[8] & 0x3f); 524 } 525 526 527 u16 wps_config_methods_str2bin(const char *str) 528 { 529 u16 methods = 0; 530 531 if (str == NULL) { 532 /* Default to enabling methods based on build configuration */ 533 methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD; 534 methods |= WPS_CONFIG_VIRT_DISPLAY; 535 #ifdef CONFIG_WPS_NFC 536 methods |= WPS_CONFIG_NFC_INTERFACE; 537 #endif /* CONFIG_WPS_NFC */ 538 } else { 539 if (os_strstr(str, "ethernet")) 540 methods |= WPS_CONFIG_ETHERNET; 541 if (os_strstr(str, "label")) 542 methods |= WPS_CONFIG_LABEL; 543 if (os_strstr(str, "display")) 544 methods |= WPS_CONFIG_DISPLAY; 545 if (os_strstr(str, "ext_nfc_token")) 546 methods |= WPS_CONFIG_EXT_NFC_TOKEN; 547 if (os_strstr(str, "int_nfc_token")) 548 methods |= WPS_CONFIG_INT_NFC_TOKEN; 549 if (os_strstr(str, "nfc_interface")) 550 methods |= WPS_CONFIG_NFC_INTERFACE; 551 if (os_strstr(str, "push_button")) 552 methods |= WPS_CONFIG_PUSHBUTTON; 553 if (os_strstr(str, "keypad")) 554 methods |= WPS_CONFIG_KEYPAD; 555 if (os_strstr(str, "virtual_display")) 556 methods |= WPS_CONFIG_VIRT_DISPLAY; 557 if (os_strstr(str, "physical_display")) 558 methods |= WPS_CONFIG_PHY_DISPLAY; 559 if (os_strstr(str, "virtual_push_button")) 560 methods |= WPS_CONFIG_VIRT_PUSHBUTTON; 561 if (os_strstr(str, "physical_push_button")) 562 methods |= WPS_CONFIG_PHY_PUSHBUTTON; 563 } 564 565 return methods; 566 } 567 568 569 struct wpabuf * wps_build_wsc_ack(struct wps_data *wps) 570 { 571 struct wpabuf *msg; 572 573 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK"); 574 575 msg = wpabuf_alloc(1000); 576 if (msg == NULL) 577 return NULL; 578 579 if (wps_build_version(msg) || 580 wps_build_msg_type(msg, WPS_WSC_ACK) || 581 wps_build_enrollee_nonce(wps, msg) || 582 wps_build_registrar_nonce(wps, msg) || 583 wps_build_wfa_ext(msg, 0, NULL, 0)) { 584 wpabuf_free(msg); 585 return NULL; 586 } 587 588 return msg; 589 } 590 591 592 struct wpabuf * wps_build_wsc_nack(struct wps_data *wps) 593 { 594 struct wpabuf *msg; 595 596 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK"); 597 598 msg = wpabuf_alloc(1000); 599 if (msg == NULL) 600 return NULL; 601 602 if (wps_build_version(msg) || 603 wps_build_msg_type(msg, WPS_WSC_NACK) || 604 wps_build_enrollee_nonce(wps, msg) || 605 wps_build_registrar_nonce(wps, msg) || 606 wps_build_config_error(msg, wps->config_error) || 607 wps_build_wfa_ext(msg, 0, NULL, 0)) { 608 wpabuf_free(msg); 609 return NULL; 610 } 611 612 return msg; 613 } 614 615 616 #ifdef CONFIG_WPS_NFC 617 618 struct wpabuf * wps_nfc_token_build(int ndef, int id, struct wpabuf *pubkey, 619 struct wpabuf *dev_pw) 620 { 621 struct wpabuf *ret; 622 623 if (pubkey == NULL || dev_pw == NULL) 624 return NULL; 625 626 ret = wps_build_nfc_pw_token(id, pubkey, dev_pw); 627 if (ndef && ret) { 628 struct wpabuf *tmp; 629 tmp = ndef_build_wifi(ret); 630 wpabuf_free(ret); 631 if (tmp == NULL) 632 return NULL; 633 ret = tmp; 634 } 635 636 return ret; 637 } 638 639 640 int wps_nfc_gen_dh(struct wpabuf **pubkey, struct wpabuf **privkey) 641 { 642 struct wpabuf *priv = NULL, *pub = NULL; 643 void *dh_ctx; 644 645 dh_ctx = dh5_init(&priv, &pub); 646 if (dh_ctx == NULL) 647 return -1; 648 pub = wpabuf_zeropad(pub, 192); 649 if (pub == NULL) { 650 wpabuf_free(priv); 651 return -1; 652 } 653 wpa_hexdump_buf(MSG_DEBUG, "WPS: Generated new DH pubkey", pub); 654 dh5_free(dh_ctx); 655 656 wpabuf_free(*pubkey); 657 *pubkey = pub; 658 wpabuf_free(*privkey); 659 *privkey = priv; 660 661 return 0; 662 } 663 664 665 struct wpabuf * wps_nfc_token_gen(int ndef, int *id, struct wpabuf **pubkey, 666 struct wpabuf **privkey, 667 struct wpabuf **dev_pw) 668 { 669 struct wpabuf *pw; 670 u16 val; 671 672 pw = wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN); 673 if (pw == NULL) 674 return NULL; 675 676 if (random_get_bytes(wpabuf_put(pw, WPS_OOB_DEVICE_PASSWORD_LEN), 677 WPS_OOB_DEVICE_PASSWORD_LEN) || 678 random_get_bytes((u8 *) &val, sizeof(val))) { 679 wpabuf_free(pw); 680 return NULL; 681 } 682 683 if (wps_nfc_gen_dh(pubkey, privkey) < 0) { 684 wpabuf_free(pw); 685 return NULL; 686 } 687 688 *id = 0x10 + val % 0xfff0; 689 wpabuf_free(*dev_pw); 690 *dev_pw = pw; 691 692 return wps_nfc_token_build(ndef, *id, *pubkey, *dev_pw); 693 } 694 695 696 struct wpabuf * wps_build_nfc_handover_req(struct wps_context *ctx, 697 struct wpabuf *nfc_dh_pubkey) 698 { 699 struct wpabuf *msg; 700 void *len; 701 702 if (ctx == NULL) 703 return NULL; 704 705 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection " 706 "handover request"); 707 708 if (nfc_dh_pubkey == NULL) { 709 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password " 710 "configured"); 711 return NULL; 712 } 713 714 msg = wpabuf_alloc(1000); 715 if (msg == NULL) 716 return msg; 717 len = wpabuf_put(msg, 2); 718 719 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER, 720 nfc_dh_pubkey, NULL, 0) || 721 wps_build_uuid_e(msg, ctx->uuid) || 722 wps_build_wfa_ext(msg, 0, NULL, 0)) { 723 wpabuf_free(msg); 724 return NULL; 725 } 726 727 WPA_PUT_BE16(len, wpabuf_len(msg) - 2); 728 729 return msg; 730 } 731 732 733 static int wps_build_ssid(struct wpabuf *msg, struct wps_context *wps) 734 { 735 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 736 wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID in Connection Handover Select", 737 wps->ssid, wps->ssid_len); 738 wpabuf_put_be16(msg, ATTR_SSID); 739 wpabuf_put_be16(msg, wps->ssid_len); 740 wpabuf_put_data(msg, wps->ssid, wps->ssid_len); 741 return 0; 742 } 743 744 745 static int wps_build_ap_freq(struct wpabuf *msg, int freq) 746 { 747 enum hostapd_hw_mode mode; 748 u8 channel, rf_band; 749 u16 ap_channel; 750 751 if (freq <= 0) 752 return 0; 753 754 mode = ieee80211_freq_to_chan(freq, &channel); 755 if (mode == NUM_HOSTAPD_MODES) 756 return 0; /* Unknown channel */ 757 758 if (mode == HOSTAPD_MODE_IEEE80211G || mode == HOSTAPD_MODE_IEEE80211B) 759 rf_band = WPS_RF_24GHZ; 760 else if (mode == HOSTAPD_MODE_IEEE80211A) 761 rf_band = WPS_RF_50GHZ; 762 else 763 return 0; /* Unknown band */ 764 ap_channel = channel; 765 766 if (wps_build_rf_bands_attr(msg, rf_band) || 767 wps_build_ap_channel(msg, ap_channel)) 768 return -1; 769 770 return 0; 771 } 772 773 774 struct wpabuf * wps_build_nfc_handover_sel(struct wps_context *ctx, 775 struct wpabuf *nfc_dh_pubkey, 776 const u8 *bssid, int freq) 777 { 778 struct wpabuf *msg; 779 void *len; 780 781 if (ctx == NULL) 782 return NULL; 783 784 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection " 785 "handover select"); 786 787 if (nfc_dh_pubkey == NULL) { 788 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password " 789 "configured"); 790 return NULL; 791 } 792 793 msg = wpabuf_alloc(1000); 794 if (msg == NULL) 795 return msg; 796 len = wpabuf_put(msg, 2); 797 798 if (wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER, 799 nfc_dh_pubkey, NULL, 0) || 800 wps_build_ssid(msg, ctx) || 801 wps_build_ap_freq(msg, freq) || 802 (bssid && wps_build_mac_addr(msg, bssid)) || 803 wps_build_wfa_ext(msg, 0, NULL, 0)) { 804 wpabuf_free(msg); 805 return NULL; 806 } 807 808 WPA_PUT_BE16(len, wpabuf_len(msg) - 2); 809 810 return msg; 811 } 812 813 814 struct wpabuf * wps_build_nfc_handover_req_p2p(struct wps_context *ctx, 815 struct wpabuf *nfc_dh_pubkey) 816 { 817 struct wpabuf *msg; 818 819 if (ctx == NULL) 820 return NULL; 821 822 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection " 823 "handover request (P2P)"); 824 825 if (nfc_dh_pubkey == NULL) { 826 wpa_printf(MSG_DEBUG, "WPS: No NFC DH Public Key configured"); 827 return NULL; 828 } 829 830 msg = wpabuf_alloc(1000); 831 if (msg == NULL) 832 return msg; 833 834 if (wps_build_manufacturer(&ctx->dev, msg) || 835 wps_build_model_name(&ctx->dev, msg) || 836 wps_build_model_number(&ctx->dev, msg) || 837 wps_build_oob_dev_pw(msg, DEV_PW_NFC_CONNECTION_HANDOVER, 838 nfc_dh_pubkey, NULL, 0) || 839 wps_build_rf_bands(&ctx->dev, msg, 0) || 840 wps_build_serial_number(&ctx->dev, msg) || 841 wps_build_uuid_e(msg, ctx->uuid) || 842 wps_build_wfa_ext(msg, 0, NULL, 0)) { 843 wpabuf_free(msg); 844 return NULL; 845 } 846 847 return msg; 848 } 849 850 851 struct wpabuf * wps_build_nfc_handover_sel_p2p(struct wps_context *ctx, 852 int nfc_dev_pw_id, 853 struct wpabuf *nfc_dh_pubkey, 854 struct wpabuf *nfc_dev_pw) 855 { 856 struct wpabuf *msg; 857 const u8 *dev_pw; 858 size_t dev_pw_len; 859 860 if (ctx == NULL) 861 return NULL; 862 863 wpa_printf(MSG_DEBUG, "WPS: Building attributes for NFC connection " 864 "handover select (P2P)"); 865 866 if (nfc_dh_pubkey == NULL || 867 (nfc_dev_pw_id != DEV_PW_NFC_CONNECTION_HANDOVER && 868 nfc_dev_pw == NULL)) { 869 wpa_printf(MSG_DEBUG, "WPS: No NFC OOB Device Password " 870 "configured"); 871 return NULL; 872 } 873 874 msg = wpabuf_alloc(1000); 875 if (msg == NULL) 876 return msg; 877 878 if (nfc_dev_pw) { 879 dev_pw = wpabuf_head(nfc_dev_pw); 880 dev_pw_len = wpabuf_len(nfc_dev_pw); 881 } else { 882 dev_pw = NULL; 883 dev_pw_len = 0; 884 } 885 886 if (wps_build_manufacturer(&ctx->dev, msg) || 887 wps_build_model_name(&ctx->dev, msg) || 888 wps_build_model_number(&ctx->dev, msg) || 889 wps_build_oob_dev_pw(msg, nfc_dev_pw_id, nfc_dh_pubkey, 890 dev_pw, dev_pw_len) || 891 wps_build_rf_bands(&ctx->dev, msg, 0) || 892 wps_build_serial_number(&ctx->dev, msg) || 893 wps_build_uuid_e(msg, ctx->uuid) || 894 wps_build_wfa_ext(msg, 0, NULL, 0)) { 895 wpabuf_free(msg); 896 return NULL; 897 } 898 899 return msg; 900 } 901 902 #endif /* CONFIG_WPS_NFC */ 903
