1 /* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "crypto/sha256.h" 19 #include "wps_i.h" 20 #include "wps_dev_attr.h" 21 22 23 static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg) 24 { 25 wpa_printf(MSG_DEBUG, "WPS: * MAC Address"); 26 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 27 wpabuf_put_be16(msg, ETH_ALEN); 28 wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN); 29 return 0; 30 } 31 32 33 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 34 { 35 u8 state; 36 if (wps->wps->ap) 37 state = wps->wps->wps_state; 38 else 39 state = WPS_STATE_NOT_CONFIGURED; 40 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 41 state); 42 wpabuf_put_be16(msg, ATTR_WPS_STATE); 43 wpabuf_put_be16(msg, 1); 44 wpabuf_put_u8(msg, state); 45 return 0; 46 } 47 48 49 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 50 { 51 u8 *hash; 52 const u8 *addr[4]; 53 size_t len[4]; 54 55 if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 56 return -1; 57 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 58 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 59 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 60 61 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 62 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 63 "E-Hash derivation"); 64 return -1; 65 } 66 67 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 68 wpabuf_put_be16(msg, ATTR_E_HASH1); 69 wpabuf_put_be16(msg, SHA256_MAC_LEN); 70 hash = wpabuf_put(msg, SHA256_MAC_LEN); 71 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 72 addr[0] = wps->snonce; 73 len[0] = WPS_SECRET_NONCE_LEN; 74 addr[1] = wps->psk1; 75 len[1] = WPS_PSK_LEN; 76 addr[2] = wpabuf_head(wps->dh_pubkey_e); 77 len[2] = wpabuf_len(wps->dh_pubkey_e); 78 addr[3] = wpabuf_head(wps->dh_pubkey_r); 79 len[3] = wpabuf_len(wps->dh_pubkey_r); 80 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 81 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 82 83 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 84 wpabuf_put_be16(msg, ATTR_E_HASH2); 85 wpabuf_put_be16(msg, SHA256_MAC_LEN); 86 hash = wpabuf_put(msg, SHA256_MAC_LEN); 87 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 88 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 89 addr[1] = wps->psk2; 90 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 91 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 92 93 return 0; 94 } 95 96 97 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 98 { 99 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 100 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 101 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 102 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 103 return 0; 104 } 105 106 107 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 108 { 109 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 110 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 111 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 112 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 113 WPS_SECRET_NONCE_LEN); 114 return 0; 115 } 116 117 118 static struct wpabuf * wps_build_m1(struct wps_data *wps) 119 { 120 struct wpabuf *msg; 121 u16 methods; 122 123 if (os_get_random(wps->nonce_e, WPS_NONCE_LEN) < 0) 124 return NULL; 125 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 126 wps->nonce_e, WPS_NONCE_LEN); 127 128 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 129 msg = wpabuf_alloc(1000); 130 if (msg == NULL) 131 return NULL; 132 133 methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD; 134 if (wps->pbc) 135 methods |= WPS_CONFIG_PUSHBUTTON; 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(wps, msg) || 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, 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_build_assoc_state(wps, msg) || 151 wps_build_dev_password_id(msg, wps->dev_pw_id) || 152 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 153 wps_build_os_version(&wps->wps->dev, msg)) { 154 wpabuf_free(msg); 155 return NULL; 156 } 157 158 wps->state = RECV_M2; 159 return msg; 160 } 161 162 163 static struct wpabuf * wps_build_m3(struct wps_data *wps) 164 { 165 struct wpabuf *msg; 166 167 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 168 169 if (wps->dev_password == NULL) { 170 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 171 return NULL; 172 } 173 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 174 175 msg = wpabuf_alloc(1000); 176 if (msg == NULL) 177 return NULL; 178 179 if (wps_build_version(msg) || 180 wps_build_msg_type(msg, WPS_M3) || 181 wps_build_registrar_nonce(wps, msg) || 182 wps_build_e_hash(wps, msg) || 183 wps_build_authenticator(wps, msg)) { 184 wpabuf_free(msg); 185 return NULL; 186 } 187 188 wps->state = RECV_M4; 189 return msg; 190 } 191 192 193 static struct wpabuf * wps_build_m5(struct wps_data *wps) 194 { 195 struct wpabuf *msg, *plain; 196 197 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 198 199 plain = wpabuf_alloc(200); 200 if (plain == NULL) 201 return NULL; 202 203 msg = wpabuf_alloc(1000); 204 if (msg == NULL) { 205 wpabuf_free(plain); 206 return NULL; 207 } 208 209 if (wps_build_version(msg) || 210 wps_build_msg_type(msg, WPS_M5) || 211 wps_build_registrar_nonce(wps, msg) || 212 wps_build_e_snonce1(wps, plain) || 213 wps_build_key_wrap_auth(wps, plain) || 214 wps_build_encr_settings(wps, msg, plain) || 215 wps_build_authenticator(wps, msg)) { 216 wpabuf_free(plain); 217 wpabuf_free(msg); 218 return NULL; 219 } 220 wpabuf_free(plain); 221 222 wps->state = RECV_M6; 223 return msg; 224 } 225 226 227 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 228 { 229 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 230 wpabuf_put_be16(msg, ATTR_SSID); 231 wpabuf_put_be16(msg, wps->wps->ssid_len); 232 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 233 return 0; 234 } 235 236 237 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 238 { 239 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type"); 240 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 241 wpabuf_put_be16(msg, 2); 242 wpabuf_put_be16(msg, wps->wps->auth_types); 243 return 0; 244 } 245 246 247 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 248 { 249 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type"); 250 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 251 wpabuf_put_be16(msg, 2); 252 wpabuf_put_be16(msg, wps->wps->encr_types); 253 return 0; 254 } 255 256 257 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 258 { 259 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 260 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 261 wpabuf_put_be16(msg, wps->wps->network_key_len); 262 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 263 return 0; 264 } 265 266 267 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 268 { 269 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 270 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 271 wpabuf_put_be16(msg, ETH_ALEN); 272 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 273 return 0; 274 } 275 276 277 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 278 { 279 if (wps->wps->ap_settings) { 280 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 281 wpabuf_put_data(plain, wps->wps->ap_settings, 282 wps->wps->ap_settings_len); 283 return 0; 284 } 285 286 return wps_build_cred_ssid(wps, plain) || 287 wps_build_cred_mac_addr(wps, plain) || 288 wps_build_cred_auth_type(wps, plain) || 289 wps_build_cred_encr_type(wps, plain) || 290 wps_build_cred_network_key(wps, plain); 291 } 292 293 294 static struct wpabuf * wps_build_m7(struct wps_data *wps) 295 { 296 struct wpabuf *msg, *plain; 297 298 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 299 300 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 301 if (plain == NULL) 302 return NULL; 303 304 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 305 if (msg == NULL) { 306 wpabuf_free(plain); 307 return NULL; 308 } 309 310 if (wps_build_version(msg) || 311 wps_build_msg_type(msg, WPS_M7) || 312 wps_build_registrar_nonce(wps, msg) || 313 wps_build_e_snonce2(wps, plain) || 314 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 315 wps_build_key_wrap_auth(wps, plain) || 316 wps_build_encr_settings(wps, msg, plain) || 317 wps_build_authenticator(wps, msg)) { 318 wpabuf_free(plain); 319 wpabuf_free(msg); 320 return NULL; 321 } 322 wpabuf_free(plain); 323 324 wps->state = RECV_M8; 325 return msg; 326 } 327 328 329 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 330 { 331 struct wpabuf *msg; 332 333 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 334 335 msg = wpabuf_alloc(1000); 336 if (msg == NULL) 337 return NULL; 338 339 if (wps_build_version(msg) || 340 wps_build_msg_type(msg, WPS_WSC_DONE) || 341 wps_build_enrollee_nonce(wps, msg) || 342 wps_build_registrar_nonce(wps, msg)) { 343 wpabuf_free(msg); 344 return NULL; 345 } 346 347 if (wps->wps->ap) 348 wps->state = RECV_ACK; 349 else { 350 wps_success_event(wps->wps); 351 wps->state = WPS_FINISHED; 352 } 353 return msg; 354 } 355 356 357 static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps) 358 { 359 struct wpabuf *msg; 360 361 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK"); 362 363 msg = wpabuf_alloc(1000); 364 if (msg == NULL) 365 return NULL; 366 367 if (wps_build_version(msg) || 368 wps_build_msg_type(msg, WPS_WSC_ACK) || 369 wps_build_enrollee_nonce(wps, msg) || 370 wps_build_registrar_nonce(wps, msg)) { 371 wpabuf_free(msg); 372 return NULL; 373 } 374 375 return msg; 376 } 377 378 379 static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps) 380 { 381 struct wpabuf *msg; 382 383 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK"); 384 385 msg = wpabuf_alloc(1000); 386 if (msg == NULL) 387 return NULL; 388 389 if (wps_build_version(msg) || 390 wps_build_msg_type(msg, WPS_WSC_NACK) || 391 wps_build_enrollee_nonce(wps, msg) || 392 wps_build_registrar_nonce(wps, msg) || 393 wps_build_config_error(msg, wps->config_error)) { 394 wpabuf_free(msg); 395 return NULL; 396 } 397 398 return msg; 399 } 400 401 402 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 403 enum wsc_op_code *op_code) 404 { 405 struct wpabuf *msg; 406 407 switch (wps->state) { 408 case SEND_M1: 409 msg = wps_build_m1(wps); 410 *op_code = WSC_MSG; 411 break; 412 case SEND_M3: 413 msg = wps_build_m3(wps); 414 *op_code = WSC_MSG; 415 break; 416 case SEND_M5: 417 msg = wps_build_m5(wps); 418 *op_code = WSC_MSG; 419 break; 420 case SEND_M7: 421 msg = wps_build_m7(wps); 422 *op_code = WSC_MSG; 423 break; 424 case RECEIVED_M2D: 425 if (wps->wps->ap) { 426 msg = wps_build_wsc_nack(wps); 427 *op_code = WSC_NACK; 428 break; 429 } 430 msg = wps_build_wsc_ack(wps); 431 *op_code = WSC_ACK; 432 if (msg) { 433 /* Another M2/M2D may be received */ 434 wps->state = RECV_M2; 435 } 436 break; 437 case SEND_WSC_NACK: 438 msg = wps_build_wsc_nack(wps); 439 *op_code = WSC_NACK; 440 break; 441 case WPS_MSG_DONE: 442 msg = wps_build_wsc_done(wps); 443 *op_code = WSC_Done; 444 break; 445 default: 446 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 447 "a message", wps->state); 448 msg = NULL; 449 break; 450 } 451 452 if (*op_code == WSC_MSG && msg) { 453 /* Save a copy of the last message for Authenticator derivation 454 */ 455 wpabuf_free(wps->last_msg); 456 wps->last_msg = wpabuf_dup(msg); 457 } 458 459 return msg; 460 } 461 462 463 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 464 { 465 if (r_nonce == NULL) { 466 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 467 return -1; 468 } 469 470 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 471 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 472 wps->nonce_r, WPS_NONCE_LEN); 473 474 return 0; 475 } 476 477 478 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 479 { 480 if (e_nonce == NULL) { 481 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 482 return -1; 483 } 484 485 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 486 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 487 return -1; 488 } 489 490 return 0; 491 } 492 493 494 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 495 { 496 if (uuid_r == NULL) { 497 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 498 return -1; 499 } 500 501 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 502 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 503 504 return 0; 505 } 506 507 508 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 509 size_t pk_len) 510 { 511 if (pk == NULL || pk_len == 0) { 512 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 513 return -1; 514 } 515 516 wpabuf_free(wps->dh_pubkey_r); 517 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 518 if (wps->dh_pubkey_r == NULL) 519 return -1; 520 521 if (wps_derive_keys(wps) < 0) 522 return -1; 523 524 return 0; 525 } 526 527 528 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 529 { 530 if (r_hash1 == NULL) { 531 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 532 return -1; 533 } 534 535 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 536 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 537 538 return 0; 539 } 540 541 542 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 543 { 544 if (r_hash2 == NULL) { 545 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 546 return -1; 547 } 548 549 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 550 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 551 552 return 0; 553 } 554 555 556 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 557 { 558 u8 hash[SHA256_MAC_LEN]; 559 const u8 *addr[4]; 560 size_t len[4]; 561 562 if (r_snonce1 == NULL) { 563 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 564 return -1; 565 } 566 567 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 568 WPS_SECRET_NONCE_LEN); 569 570 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 571 addr[0] = r_snonce1; 572 len[0] = WPS_SECRET_NONCE_LEN; 573 addr[1] = wps->psk1; 574 len[1] = WPS_PSK_LEN; 575 addr[2] = wpabuf_head(wps->dh_pubkey_e); 576 len[2] = wpabuf_len(wps->dh_pubkey_e); 577 addr[3] = wpabuf_head(wps->dh_pubkey_r); 578 len[3] = wpabuf_len(wps->dh_pubkey_r); 579 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 580 581 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 582 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 583 "not match with the pre-committed value"); 584 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 585 wps_pwd_auth_fail_event(wps->wps, 1, 1); 586 return -1; 587 } 588 589 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 590 "half of the device password"); 591 592 return 0; 593 } 594 595 596 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 597 { 598 u8 hash[SHA256_MAC_LEN]; 599 const u8 *addr[4]; 600 size_t len[4]; 601 602 if (r_snonce2 == NULL) { 603 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 604 return -1; 605 } 606 607 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 608 WPS_SECRET_NONCE_LEN); 609 610 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 611 addr[0] = r_snonce2; 612 len[0] = WPS_SECRET_NONCE_LEN; 613 addr[1] = wps->psk2; 614 len[1] = WPS_PSK_LEN; 615 addr[2] = wpabuf_head(wps->dh_pubkey_e); 616 len[2] = wpabuf_len(wps->dh_pubkey_e); 617 addr[3] = wpabuf_head(wps->dh_pubkey_r); 618 len[3] = wpabuf_len(wps->dh_pubkey_r); 619 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 620 621 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 622 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 623 "not match with the pre-committed value"); 624 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 625 wps_pwd_auth_fail_event(wps->wps, 1, 2); 626 return -1; 627 } 628 629 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 630 "half of the device password"); 631 632 return 0; 633 } 634 635 636 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 637 size_t cred_len) 638 { 639 struct wps_parse_attr attr; 640 struct wpabuf msg; 641 642 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 643 os_memset(&wps->cred, 0, sizeof(wps->cred)); 644 wpabuf_set(&msg, cred, cred_len); 645 if (wps_parse_msg(&msg, &attr) < 0 || 646 wps_process_cred(&attr, &wps->cred)) 647 return -1; 648 649 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 650 0) { 651 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 652 MACSTR ") does not match with own address (" MACSTR 653 ")", MAC2STR(wps->cred.mac_addr), 654 MAC2STR(wps->wps->dev.mac_addr)); 655 /* 656 * In theory, this could be consider fatal error, but there are 657 * number of deployed implementations using other address here 658 * due to unclarity in the specification. For interoperability 659 * reasons, allow this to be processed since we do not really 660 * use the MAC Address information for anything. 661 */ 662 } 663 664 if (wps->wps->cred_cb) { 665 wps->cred.cred_attr = cred - 4; 666 wps->cred.cred_attr_len = cred_len + 4; 667 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 668 wps->cred.cred_attr = NULL; 669 wps->cred.cred_attr_len = 0; 670 } 671 672 return 0; 673 } 674 675 676 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 677 size_t cred_len[], size_t num_cred) 678 { 679 size_t i; 680 681 if (wps->wps->ap) 682 return 0; 683 684 if (num_cred == 0) { 685 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 686 "received"); 687 return -1; 688 } 689 690 for (i = 0; i < num_cred; i++) { 691 if (wps_process_cred_e(wps, cred[i], cred_len[i])) 692 return -1; 693 } 694 695 return 0; 696 } 697 698 699 static int wps_process_ap_settings_e(struct wps_data *wps, 700 struct wps_parse_attr *attr, 701 struct wpabuf *attrs) 702 { 703 struct wps_credential cred; 704 705 if (!wps->wps->ap) 706 return 0; 707 708 if (wps_process_ap_settings(attr, &cred) < 0) 709 return -1; 710 711 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 712 "Registrar"); 713 714 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 715 0) { 716 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 717 MACSTR ") does not match with own address (" MACSTR 718 ")", MAC2STR(cred.mac_addr), 719 MAC2STR(wps->wps->dev.mac_addr)); 720 /* 721 * In theory, this could be consider fatal error, but there are 722 * number of deployed implementations using other address here 723 * due to unclarity in the specification. For interoperability 724 * reasons, allow this to be processed since we do not really 725 * use the MAC Address information for anything. 726 */ 727 } 728 729 if (wps->wps->cred_cb) { 730 cred.cred_attr = wpabuf_head(attrs); 731 cred.cred_attr_len = wpabuf_len(attrs); 732 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 733 } 734 735 return 0; 736 } 737 738 739 static enum wps_process_res wps_process_m2(struct wps_data *wps, 740 const struct wpabuf *msg, 741 struct wps_parse_attr *attr) 742 { 743 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 744 745 if (wps->state != RECV_M2) { 746 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 747 "receiving M2", wps->state); 748 wps->state = SEND_WSC_NACK; 749 return WPS_CONTINUE; 750 } 751 752 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 753 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 754 wps_process_uuid_r(wps, attr->uuid_r) || 755 wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 756 wps_process_authenticator(wps, attr->authenticator, msg)) { 757 wps->state = SEND_WSC_NACK; 758 return WPS_CONTINUE; 759 } 760 761 if (wps->wps->ap && wps->wps->ap_setup_locked) { 762 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 763 "registration of a new Registrar"); 764 wps->config_error = WPS_CFG_SETUP_LOCKED; 765 wps->state = SEND_WSC_NACK; 766 return WPS_CONTINUE; 767 } 768 769 wps->state = SEND_M3; 770 return WPS_CONTINUE; 771 } 772 773 774 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 775 struct wps_parse_attr *attr) 776 { 777 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 778 779 if (wps->state != RECV_M2) { 780 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 781 "receiving M2D", wps->state); 782 wps->state = SEND_WSC_NACK; 783 return WPS_CONTINUE; 784 } 785 786 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 787 attr->manufacturer, attr->manufacturer_len); 788 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 789 attr->model_name, attr->model_name_len); 790 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 791 attr->model_number, attr->model_number_len); 792 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 793 attr->serial_number, attr->serial_number_len); 794 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 795 attr->dev_name, attr->dev_name_len); 796 797 if (wps->wps->event_cb) { 798 union wps_event_data data; 799 struct wps_event_m2d *m2d = &data.m2d; 800 os_memset(&data, 0, sizeof(data)); 801 if (attr->config_methods) 802 m2d->config_methods = 803 WPA_GET_BE16(attr->config_methods); 804 m2d->manufacturer = attr->manufacturer; 805 m2d->manufacturer_len = attr->manufacturer_len; 806 m2d->model_name = attr->model_name; 807 m2d->model_name_len = attr->model_name_len; 808 m2d->model_number = attr->model_number; 809 m2d->model_number_len = attr->model_number_len; 810 m2d->serial_number = attr->serial_number; 811 m2d->serial_number_len = attr->serial_number_len; 812 m2d->dev_name = attr->dev_name; 813 m2d->dev_name_len = attr->dev_name_len; 814 m2d->primary_dev_type = attr->primary_dev_type; 815 if (attr->config_error) 816 m2d->config_error = 817 WPA_GET_BE16(attr->config_error); 818 if (attr->dev_password_id) 819 m2d->dev_password_id = 820 WPA_GET_BE16(attr->dev_password_id); 821 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 822 } 823 824 wps->state = RECEIVED_M2D; 825 return WPS_CONTINUE; 826 } 827 828 829 static enum wps_process_res wps_process_m4(struct wps_data *wps, 830 const struct wpabuf *msg, 831 struct wps_parse_attr *attr) 832 { 833 struct wpabuf *decrypted; 834 struct wps_parse_attr eattr; 835 836 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 837 838 if (wps->state != RECV_M4) { 839 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 840 "receiving M4", wps->state); 841 wps->state = SEND_WSC_NACK; 842 return WPS_CONTINUE; 843 } 844 845 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 846 wps_process_authenticator(wps, attr->authenticator, msg) || 847 wps_process_r_hash1(wps, attr->r_hash1) || 848 wps_process_r_hash2(wps, attr->r_hash2)) { 849 wps->state = SEND_WSC_NACK; 850 return WPS_CONTINUE; 851 } 852 853 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 854 attr->encr_settings_len); 855 if (decrypted == NULL) { 856 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 857 "Settings attribute"); 858 wps->state = SEND_WSC_NACK; 859 return WPS_CONTINUE; 860 } 861 862 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 863 "attribute"); 864 if (wps_parse_msg(decrypted, &eattr) < 0 || 865 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 866 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 867 wpabuf_free(decrypted); 868 wps->state = SEND_WSC_NACK; 869 return WPS_CONTINUE; 870 } 871 wpabuf_free(decrypted); 872 873 wps->state = SEND_M5; 874 return WPS_CONTINUE; 875 } 876 877 878 static enum wps_process_res wps_process_m6(struct wps_data *wps, 879 const struct wpabuf *msg, 880 struct wps_parse_attr *attr) 881 { 882 struct wpabuf *decrypted; 883 struct wps_parse_attr eattr; 884 885 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 886 887 if (wps->state != RECV_M6) { 888 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 889 "receiving M6", wps->state); 890 wps->state = SEND_WSC_NACK; 891 return WPS_CONTINUE; 892 } 893 894 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 895 wps_process_authenticator(wps, attr->authenticator, msg)) { 896 wps->state = SEND_WSC_NACK; 897 return WPS_CONTINUE; 898 } 899 900 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 901 attr->encr_settings_len); 902 if (decrypted == NULL) { 903 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 904 "Settings attribute"); 905 wps->state = SEND_WSC_NACK; 906 return WPS_CONTINUE; 907 } 908 909 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 910 "attribute"); 911 if (wps_parse_msg(decrypted, &eattr) < 0 || 912 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 913 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 914 wpabuf_free(decrypted); 915 wps->state = SEND_WSC_NACK; 916 return WPS_CONTINUE; 917 } 918 wpabuf_free(decrypted); 919 920 wps->state = SEND_M7; 921 return WPS_CONTINUE; 922 } 923 924 925 static enum wps_process_res wps_process_m8(struct wps_data *wps, 926 const struct wpabuf *msg, 927 struct wps_parse_attr *attr) 928 { 929 struct wpabuf *decrypted; 930 struct wps_parse_attr eattr; 931 932 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 933 934 if (wps->state != RECV_M8) { 935 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 936 "receiving M8", wps->state); 937 wps->state = SEND_WSC_NACK; 938 return WPS_CONTINUE; 939 } 940 941 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 942 wps_process_authenticator(wps, attr->authenticator, msg)) { 943 wps->state = SEND_WSC_NACK; 944 return WPS_CONTINUE; 945 } 946 947 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 948 attr->encr_settings_len); 949 if (decrypted == NULL) { 950 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 951 "Settings attribute"); 952 wps->state = SEND_WSC_NACK; 953 return WPS_CONTINUE; 954 } 955 956 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 957 "attribute"); 958 if (wps_parse_msg(decrypted, &eattr) < 0 || 959 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 960 wps_process_creds(wps, eattr.cred, eattr.cred_len, 961 eattr.num_cred) || 962 wps_process_ap_settings_e(wps, &eattr, decrypted)) { 963 wpabuf_free(decrypted); 964 wps->state = SEND_WSC_NACK; 965 return WPS_CONTINUE; 966 } 967 wpabuf_free(decrypted); 968 969 wps->state = WPS_MSG_DONE; 970 return WPS_CONTINUE; 971 } 972 973 974 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 975 const struct wpabuf *msg) 976 { 977 struct wps_parse_attr attr; 978 enum wps_process_res ret = WPS_CONTINUE; 979 980 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 981 982 if (wps_parse_msg(msg, &attr) < 0) 983 return WPS_FAILURE; 984 985 if (!wps_version_supported(attr.version)) { 986 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 987 attr.version ? *attr.version : 0); 988 return WPS_FAILURE; 989 } 990 991 if (attr.enrollee_nonce == NULL || 992 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 993 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 994 return WPS_FAILURE; 995 } 996 997 if (attr.msg_type == NULL) { 998 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 999 return WPS_FAILURE; 1000 } 1001 1002 switch (*attr.msg_type) { 1003 case WPS_M2: 1004 ret = wps_process_m2(wps, msg, &attr); 1005 break; 1006 case WPS_M2D: 1007 ret = wps_process_m2d(wps, &attr); 1008 break; 1009 case WPS_M4: 1010 ret = wps_process_m4(wps, msg, &attr); 1011 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1012 wps_fail_event(wps->wps, WPS_M4); 1013 break; 1014 case WPS_M6: 1015 ret = wps_process_m6(wps, msg, &attr); 1016 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1017 wps_fail_event(wps->wps, WPS_M6); 1018 break; 1019 case WPS_M8: 1020 ret = wps_process_m8(wps, msg, &attr); 1021 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1022 wps_fail_event(wps->wps, WPS_M8); 1023 break; 1024 default: 1025 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1026 *attr.msg_type); 1027 return WPS_FAILURE; 1028 } 1029 1030 /* 1031 * Save a copy of the last message for Authenticator derivation if we 1032 * are continuing. However, skip M2D since it is not authenticated and 1033 * neither is the ACK/NACK response frame. This allows the possibly 1034 * following M2 to be processed correctly by using the previously sent 1035 * M1 in Authenticator derivation. 1036 */ 1037 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1038 /* Save a copy of the last message for Authenticator derivation 1039 */ 1040 wpabuf_free(wps->last_msg); 1041 wps->last_msg = wpabuf_dup(msg); 1042 } 1043 1044 return ret; 1045 } 1046 1047 1048 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1049 const struct wpabuf *msg) 1050 { 1051 struct wps_parse_attr attr; 1052 1053 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1054 1055 if (wps_parse_msg(msg, &attr) < 0) 1056 return WPS_FAILURE; 1057 1058 if (!wps_version_supported(attr.version)) { 1059 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 1060 attr.version ? *attr.version : 0); 1061 return WPS_FAILURE; 1062 } 1063 1064 if (attr.msg_type == NULL) { 1065 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1066 return WPS_FAILURE; 1067 } 1068 1069 if (*attr.msg_type != WPS_WSC_ACK) { 1070 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1071 *attr.msg_type); 1072 return WPS_FAILURE; 1073 } 1074 1075 if (attr.registrar_nonce == NULL || 1076 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1077 { 1078 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1079 return WPS_FAILURE; 1080 } 1081 1082 if (attr.enrollee_nonce == NULL || 1083 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1084 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1085 return WPS_FAILURE; 1086 } 1087 1088 if (wps->state == RECV_ACK && wps->wps->ap) { 1089 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1090 "completed successfully"); 1091 wps_success_event(wps->wps); 1092 wps->state = WPS_FINISHED; 1093 return WPS_DONE; 1094 } 1095 1096 return WPS_FAILURE; 1097 } 1098 1099 1100 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1101 const struct wpabuf *msg) 1102 { 1103 struct wps_parse_attr attr; 1104 1105 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1106 1107 if (wps_parse_msg(msg, &attr) < 0) 1108 return WPS_FAILURE; 1109 1110 if (!wps_version_supported(attr.version)) { 1111 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 1112 attr.version ? *attr.version : 0); 1113 return WPS_FAILURE; 1114 } 1115 1116 if (attr.msg_type == NULL) { 1117 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1118 return WPS_FAILURE; 1119 } 1120 1121 if (*attr.msg_type != WPS_WSC_NACK) { 1122 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1123 *attr.msg_type); 1124 return WPS_FAILURE; 1125 } 1126 1127 if (attr.registrar_nonce == NULL || 1128 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1129 { 1130 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1131 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1132 attr.registrar_nonce, WPS_NONCE_LEN); 1133 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1134 wps->nonce_r, WPS_NONCE_LEN); 1135 return WPS_FAILURE; 1136 } 1137 1138 if (attr.enrollee_nonce == NULL || 1139 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1140 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1141 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1142 attr.enrollee_nonce, WPS_NONCE_LEN); 1143 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1144 wps->nonce_e, WPS_NONCE_LEN); 1145 return WPS_FAILURE; 1146 } 1147 1148 if (attr.config_error == NULL) { 1149 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1150 "in WSC_NACK"); 1151 return WPS_FAILURE; 1152 } 1153 1154 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1155 "Configuration Error %d", WPA_GET_BE16(attr.config_error)); 1156 1157 switch (wps->state) { 1158 case RECV_M4: 1159 wps_fail_event(wps->wps, WPS_M3); 1160 break; 1161 case RECV_M6: 1162 wps_fail_event(wps->wps, WPS_M5); 1163 break; 1164 case RECV_M8: 1165 wps_fail_event(wps->wps, WPS_M7); 1166 break; 1167 default: 1168 break; 1169 } 1170 1171 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1172 * Enrollee is Authenticator */ 1173 wps->state = SEND_WSC_NACK; 1174 1175 return WPS_FAILURE; 1176 } 1177 1178 1179 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1180 enum wsc_op_code op_code, 1181 const struct wpabuf *msg) 1182 { 1183 1184 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1185 "op_code=%d)", 1186 (unsigned long) wpabuf_len(msg), op_code); 1187 1188 if (op_code == WSC_UPnP) { 1189 /* Determine the OpCode based on message type attribute */ 1190 struct wps_parse_attr attr; 1191 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1192 if (*attr.msg_type == WPS_WSC_ACK) 1193 op_code = WSC_ACK; 1194 else if (*attr.msg_type == WPS_WSC_NACK) 1195 op_code = WSC_NACK; 1196 } 1197 } 1198 1199 switch (op_code) { 1200 case WSC_MSG: 1201 case WSC_UPnP: 1202 return wps_process_wsc_msg(wps, msg); 1203 case WSC_ACK: 1204 return wps_process_wsc_ack(wps, msg); 1205 case WSC_NACK: 1206 return wps_process_wsc_nack(wps, msg); 1207 default: 1208 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1209 return WPS_FAILURE; 1210 } 1211 } 1212
