1/* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j@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/crypto.h" 19#include "crypto/sha256.h" 20#include "wps_i.h" 21#include "wps_dev_attr.h" 22 23 24static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg) 25{ 26 wpa_printf(MSG_DEBUG, "WPS: * MAC Address"); 27 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 28 wpabuf_put_be16(msg, ETH_ALEN); 29 wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN); 30 return 0; 31} 32 33 34static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 35{ 36 u8 state; 37 if (wps->wps->ap) 38 state = wps->wps->wps_state; 39 else 40 state = WPS_STATE_NOT_CONFIGURED; 41 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 42 state); 43 wpabuf_put_be16(msg, ATTR_WPS_STATE); 44 wpabuf_put_be16(msg, 1); 45 wpabuf_put_u8(msg, state); 46 return 0; 47} 48 49 50static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 51{ 52 u8 *hash; 53 const u8 *addr[4]; 54 size_t len[4]; 55 56 if (os_get_random(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 57 return -1; 58 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 59 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 60 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 61 62 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 63 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 64 "E-Hash derivation"); 65 return -1; 66 } 67 68 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 69 wpabuf_put_be16(msg, ATTR_E_HASH1); 70 wpabuf_put_be16(msg, SHA256_MAC_LEN); 71 hash = wpabuf_put(msg, SHA256_MAC_LEN); 72 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 73 addr[0] = wps->snonce; 74 len[0] = WPS_SECRET_NONCE_LEN; 75 addr[1] = wps->psk1; 76 len[1] = WPS_PSK_LEN; 77 addr[2] = wpabuf_head(wps->dh_pubkey_e); 78 len[2] = wpabuf_len(wps->dh_pubkey_e); 79 addr[3] = wpabuf_head(wps->dh_pubkey_r); 80 len[3] = wpabuf_len(wps->dh_pubkey_r); 81 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 82 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 83 84 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 85 wpabuf_put_be16(msg, ATTR_E_HASH2); 86 wpabuf_put_be16(msg, SHA256_MAC_LEN); 87 hash = wpabuf_put(msg, SHA256_MAC_LEN); 88 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 89 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 90 addr[1] = wps->psk2; 91 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 92 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 93 94 return 0; 95} 96 97 98static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 99{ 100 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 101 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 102 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 103 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 104 return 0; 105} 106 107 108static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 109{ 110 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 111 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 112 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 113 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 114 WPS_SECRET_NONCE_LEN); 115 return 0; 116} 117 118 119static struct wpabuf * wps_build_m1(struct wps_data *wps) 120{ 121 struct wpabuf *msg; 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 if (wps_build_version(msg) || 134 wps_build_msg_type(msg, WPS_M1) || 135 wps_build_uuid_e(msg, wps->uuid_e) || 136 wps_build_mac_addr(wps, msg) || 137 wps_build_enrollee_nonce(wps, msg) || 138 wps_build_public_key(wps, msg) || 139 wps_build_auth_type_flags(wps, msg) || 140 wps_build_encr_type_flags(wps, msg) || 141 wps_build_conn_type_flags(wps, msg) || 142 wps_build_config_methods(msg, wps->wps->config_methods) || 143 wps_build_wps_state(wps, msg) || 144 wps_build_device_attrs(&wps->wps->dev, msg) || 145 wps_build_rf_bands(&wps->wps->dev, msg) || 146 wps_build_assoc_state(wps, msg) || 147 wps_build_dev_password_id(msg, wps->dev_pw_id) || 148 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 149 wps_build_os_version(&wps->wps->dev, msg)) { 150 wpabuf_free(msg); 151 return NULL; 152 } 153 154 wps->state = RECV_M2; 155 return msg; 156} 157 158 159static struct wpabuf * wps_build_m3(struct wps_data *wps) 160{ 161 struct wpabuf *msg; 162 163 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 164 165 if (wps->dev_password == NULL) { 166 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 167 return NULL; 168 } 169 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 170 171 msg = wpabuf_alloc(1000); 172 if (msg == NULL) 173 return NULL; 174 175 if (wps_build_version(msg) || 176 wps_build_msg_type(msg, WPS_M3) || 177 wps_build_registrar_nonce(wps, msg) || 178 wps_build_e_hash(wps, msg) || 179 wps_build_authenticator(wps, msg)) { 180 wpabuf_free(msg); 181 return NULL; 182 } 183 184 wps->state = RECV_M4; 185 return msg; 186} 187 188 189static struct wpabuf * wps_build_m5(struct wps_data *wps) 190{ 191 struct wpabuf *msg, *plain; 192 193 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 194 195 plain = wpabuf_alloc(200); 196 if (plain == NULL) 197 return NULL; 198 199 msg = wpabuf_alloc(1000); 200 if (msg == NULL) { 201 wpabuf_free(plain); 202 return NULL; 203 } 204 205 if (wps_build_version(msg) || 206 wps_build_msg_type(msg, WPS_M5) || 207 wps_build_registrar_nonce(wps, msg) || 208 wps_build_e_snonce1(wps, plain) || 209 wps_build_key_wrap_auth(wps, plain) || 210 wps_build_encr_settings(wps, msg, plain) || 211 wps_build_authenticator(wps, msg)) { 212 wpabuf_free(plain); 213 wpabuf_free(msg); 214 return NULL; 215 } 216 wpabuf_free(plain); 217 218 wps->state = RECV_M6; 219 return msg; 220} 221 222 223static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 224{ 225 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 226 wpabuf_put_be16(msg, ATTR_SSID); 227 wpabuf_put_be16(msg, wps->wps->ssid_len); 228 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 229 return 0; 230} 231 232 233static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 234{ 235 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type"); 236 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 237 wpabuf_put_be16(msg, 2); 238 wpabuf_put_be16(msg, wps->wps->auth_types); 239 return 0; 240} 241 242 243static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 244{ 245 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type"); 246 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 247 wpabuf_put_be16(msg, 2); 248 wpabuf_put_be16(msg, wps->wps->encr_types); 249 return 0; 250} 251 252 253static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 254{ 255 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 256 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 257 wpabuf_put_be16(msg, wps->wps->network_key_len); 258 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 259 return 0; 260} 261 262 263static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 264{ 265 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 266 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 267 wpabuf_put_be16(msg, ETH_ALEN); 268 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 269 return 0; 270} 271 272 273static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 274{ 275 if (wps->wps->ap_settings) { 276 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 277 wpabuf_put_data(plain, wps->wps->ap_settings, 278 wps->wps->ap_settings_len); 279 return 0; 280 } 281 282 return wps_build_cred_ssid(wps, plain) || 283 wps_build_cred_mac_addr(wps, plain) || 284 wps_build_cred_auth_type(wps, plain) || 285 wps_build_cred_encr_type(wps, plain) || 286 wps_build_cred_network_key(wps, plain); 287} 288 289 290static struct wpabuf * wps_build_m7(struct wps_data *wps) 291{ 292 struct wpabuf *msg, *plain; 293 294 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 295 296 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 297 if (plain == NULL) 298 return NULL; 299 300 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 301 if (msg == NULL) { 302 wpabuf_free(plain); 303 return NULL; 304 } 305 306 if (wps_build_version(msg) || 307 wps_build_msg_type(msg, WPS_M7) || 308 wps_build_registrar_nonce(wps, msg) || 309 wps_build_e_snonce2(wps, plain) || 310 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 311 wps_build_key_wrap_auth(wps, plain) || 312 wps_build_encr_settings(wps, msg, plain) || 313 wps_build_authenticator(wps, msg)) { 314 wpabuf_free(plain); 315 wpabuf_free(msg); 316 return NULL; 317 } 318 wpabuf_free(plain); 319 320 if (wps->wps->ap && wps->wps->registrar) { 321 /* 322 * If the Registrar is only learning our current configuration, 323 * it may not continue protocol run to successful completion. 324 * Store information here to make sure it remains available. 325 */ 326 wps_device_store(wps->wps->registrar, &wps->peer_dev, 327 wps->uuid_r); 328 } 329 330 wps->state = RECV_M8; 331 return msg; 332} 333 334 335static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 336{ 337 struct wpabuf *msg; 338 339 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 340 341 msg = wpabuf_alloc(1000); 342 if (msg == NULL) 343 return NULL; 344 345 if (wps_build_version(msg) || 346 wps_build_msg_type(msg, WPS_WSC_DONE) || 347 wps_build_enrollee_nonce(wps, msg) || 348 wps_build_registrar_nonce(wps, msg)) { 349 wpabuf_free(msg); 350 return NULL; 351 } 352 353 if (wps->wps->ap) 354 wps->state = RECV_ACK; 355 else { 356 wps_success_event(wps->wps); 357 wps->state = WPS_FINISHED; 358 } 359 return msg; 360} 361 362 363static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps) 364{ 365 struct wpabuf *msg; 366 367 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK"); 368 369 msg = wpabuf_alloc(1000); 370 if (msg == NULL) 371 return NULL; 372 373 if (wps_build_version(msg) || 374 wps_build_msg_type(msg, WPS_WSC_ACK) || 375 wps_build_enrollee_nonce(wps, msg) || 376 wps_build_registrar_nonce(wps, msg)) { 377 wpabuf_free(msg); 378 return NULL; 379 } 380 381 return msg; 382} 383 384 385static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps) 386{ 387 struct wpabuf *msg; 388 389 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK"); 390 391 msg = wpabuf_alloc(1000); 392 if (msg == NULL) 393 return NULL; 394 395 if (wps_build_version(msg) || 396 wps_build_msg_type(msg, WPS_WSC_NACK) || 397 wps_build_enrollee_nonce(wps, msg) || 398 wps_build_registrar_nonce(wps, msg) || 399 wps_build_config_error(msg, wps->config_error)) { 400 wpabuf_free(msg); 401 return NULL; 402 } 403 404 return msg; 405} 406 407 408struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 409 enum wsc_op_code *op_code) 410{ 411 struct wpabuf *msg; 412 413 switch (wps->state) { 414 case SEND_M1: 415 msg = wps_build_m1(wps); 416 *op_code = WSC_MSG; 417 break; 418 case SEND_M3: 419 msg = wps_build_m3(wps); 420 *op_code = WSC_MSG; 421 break; 422 case SEND_M5: 423 msg = wps_build_m5(wps); 424 *op_code = WSC_MSG; 425 break; 426 case SEND_M7: 427 msg = wps_build_m7(wps); 428 *op_code = WSC_MSG; 429 break; 430 case RECEIVED_M2D: 431 if (wps->wps->ap) { 432 msg = wps_build_wsc_nack(wps); 433 *op_code = WSC_NACK; 434 break; 435 } 436 msg = wps_build_wsc_ack(wps); 437 *op_code = WSC_ACK; 438 if (msg) { 439 /* Another M2/M2D may be received */ 440 wps->state = RECV_M2; 441 } 442 break; 443 case SEND_WSC_NACK: 444 msg = wps_build_wsc_nack(wps); 445 *op_code = WSC_NACK; 446 break; 447 case WPS_MSG_DONE: 448 msg = wps_build_wsc_done(wps); 449 *op_code = WSC_Done; 450 break; 451 default: 452 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 453 "a message", wps->state); 454 msg = NULL; 455 break; 456 } 457 458 if (*op_code == WSC_MSG && msg) { 459 /* Save a copy of the last message for Authenticator derivation 460 */ 461 wpabuf_free(wps->last_msg); 462 wps->last_msg = wpabuf_dup(msg); 463 } 464 465 return msg; 466} 467 468 469static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 470{ 471 if (r_nonce == NULL) { 472 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 473 return -1; 474 } 475 476 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 477 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 478 wps->nonce_r, WPS_NONCE_LEN); 479 480 return 0; 481} 482 483 484static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 485{ 486 if (e_nonce == NULL) { 487 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 488 return -1; 489 } 490 491 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 492 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 493 return -1; 494 } 495 496 return 0; 497} 498 499 500static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 501{ 502 if (uuid_r == NULL) { 503 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 504 return -1; 505 } 506 507 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 508 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 509 510 return 0; 511} 512 513 514static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 515 size_t pk_len) 516{ 517 if (pk == NULL || pk_len == 0) { 518 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 519 return -1; 520 } 521 522#ifdef CONFIG_WPS_OOB 523 if (wps->dev_pw_id != DEV_PW_DEFAULT && 524 wps->wps->oob_conf.pubkey_hash) { 525 const u8 *addr[1]; 526 u8 hash[WPS_HASH_LEN]; 527 528 addr[0] = pk; 529 sha256_vector(1, addr, &pk_len, hash); 530 if (os_memcmp(hash, 531 wpabuf_head(wps->wps->oob_conf.pubkey_hash), 532 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 533 wpa_printf(MSG_ERROR, "WPS: Public Key hash error"); 534 return -1; 535 } 536 } 537#endif /* CONFIG_WPS_OOB */ 538 539 wpabuf_free(wps->dh_pubkey_r); 540 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 541 if (wps->dh_pubkey_r == NULL) 542 return -1; 543 544 if (wps_derive_keys(wps) < 0) 545 return -1; 546 547 return 0; 548} 549 550 551static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 552{ 553 if (r_hash1 == NULL) { 554 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 555 return -1; 556 } 557 558 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 559 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 560 561 return 0; 562} 563 564 565static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 566{ 567 if (r_hash2 == NULL) { 568 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 569 return -1; 570 } 571 572 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 573 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 574 575 return 0; 576} 577 578 579static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 580{ 581 u8 hash[SHA256_MAC_LEN]; 582 const u8 *addr[4]; 583 size_t len[4]; 584 585 if (r_snonce1 == NULL) { 586 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 587 return -1; 588 } 589 590 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 591 WPS_SECRET_NONCE_LEN); 592 593 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 594 addr[0] = r_snonce1; 595 len[0] = WPS_SECRET_NONCE_LEN; 596 addr[1] = wps->psk1; 597 len[1] = WPS_PSK_LEN; 598 addr[2] = wpabuf_head(wps->dh_pubkey_e); 599 len[2] = wpabuf_len(wps->dh_pubkey_e); 600 addr[3] = wpabuf_head(wps->dh_pubkey_r); 601 len[3] = wpabuf_len(wps->dh_pubkey_r); 602 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 603 604 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 605 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 606 "not match with the pre-committed value"); 607 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 608 wps_pwd_auth_fail_event(wps->wps, 1, 1); 609 return -1; 610 } 611 612 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 613 "half of the device password"); 614 615 return 0; 616} 617 618 619static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 620{ 621 u8 hash[SHA256_MAC_LEN]; 622 const u8 *addr[4]; 623 size_t len[4]; 624 625 if (r_snonce2 == NULL) { 626 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 627 return -1; 628 } 629 630 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 631 WPS_SECRET_NONCE_LEN); 632 633 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 634 addr[0] = r_snonce2; 635 len[0] = WPS_SECRET_NONCE_LEN; 636 addr[1] = wps->psk2; 637 len[1] = WPS_PSK_LEN; 638 addr[2] = wpabuf_head(wps->dh_pubkey_e); 639 len[2] = wpabuf_len(wps->dh_pubkey_e); 640 addr[3] = wpabuf_head(wps->dh_pubkey_r); 641 len[3] = wpabuf_len(wps->dh_pubkey_r); 642 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 643 644 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 645 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 646 "not match with the pre-committed value"); 647 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 648 wps_pwd_auth_fail_event(wps->wps, 1, 2); 649 return -1; 650 } 651 652 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 653 "half of the device password"); 654 655 return 0; 656} 657 658 659static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 660 size_t cred_len) 661{ 662 struct wps_parse_attr attr; 663 struct wpabuf msg; 664 665 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 666 os_memset(&wps->cred, 0, sizeof(wps->cred)); 667 wpabuf_set(&msg, cred, cred_len); 668 if (wps_parse_msg(&msg, &attr) < 0 || 669 wps_process_cred(&attr, &wps->cred)) 670 return -1; 671 672 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 673 0) { 674 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 675 MACSTR ") does not match with own address (" MACSTR 676 ")", MAC2STR(wps->cred.mac_addr), 677 MAC2STR(wps->wps->dev.mac_addr)); 678 /* 679 * In theory, this could be consider fatal error, but there are 680 * number of deployed implementations using other address here 681 * due to unclarity in the specification. For interoperability 682 * reasons, allow this to be processed since we do not really 683 * use the MAC Address information for anything. 684 */ 685 } 686 687 if (wps->wps->cred_cb) { 688 wps->cred.cred_attr = cred - 4; 689 wps->cred.cred_attr_len = cred_len + 4; 690 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 691 wps->cred.cred_attr = NULL; 692 wps->cred.cred_attr_len = 0; 693 } 694 695 return 0; 696} 697 698 699static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 700 size_t cred_len[], size_t num_cred) 701{ 702 size_t i; 703 704 if (wps->wps->ap) 705 return 0; 706 707 if (num_cred == 0) { 708 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 709 "received"); 710 return -1; 711 } 712 713 for (i = 0; i < num_cred; i++) { 714 if (wps_process_cred_e(wps, cred[i], cred_len[i])) 715 return -1; 716 } 717 718 return 0; 719} 720 721 722static int wps_process_ap_settings_e(struct wps_data *wps, 723 struct wps_parse_attr *attr, 724 struct wpabuf *attrs) 725{ 726 struct wps_credential cred; 727 728 if (!wps->wps->ap) 729 return 0; 730 731 if (wps_process_ap_settings(attr, &cred) < 0) 732 return -1; 733 734 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 735 "Registrar"); 736 737 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 738 0) { 739 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 740 MACSTR ") does not match with own address (" MACSTR 741 ")", MAC2STR(cred.mac_addr), 742 MAC2STR(wps->wps->dev.mac_addr)); 743 /* 744 * In theory, this could be consider fatal error, but there are 745 * number of deployed implementations using other address here 746 * due to unclarity in the specification. For interoperability 747 * reasons, allow this to be processed since we do not really 748 * use the MAC Address information for anything. 749 */ 750 } 751 752 if (wps->wps->cred_cb) { 753 cred.cred_attr = wpabuf_head(attrs); 754 cred.cred_attr_len = wpabuf_len(attrs); 755 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 756 } 757 758 return 0; 759} 760 761 762static enum wps_process_res wps_process_m2(struct wps_data *wps, 763 const struct wpabuf *msg, 764 struct wps_parse_attr *attr) 765{ 766 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 767 768 if (wps->state != RECV_M2) { 769 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 770 "receiving M2", wps->state); 771 wps->state = SEND_WSC_NACK; 772 return WPS_CONTINUE; 773 } 774 775 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 776 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 777 wps_process_uuid_r(wps, attr->uuid_r)) { 778 wps->state = SEND_WSC_NACK; 779 return WPS_CONTINUE; 780 } 781 782 if (wps->wps->ap && 783 (wps->wps->ap_setup_locked || wps->dev_password == NULL)) { 784 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 785 "registration of a new Registrar"); 786 wps->config_error = WPS_CFG_SETUP_LOCKED; 787 wps->state = SEND_WSC_NACK; 788 return WPS_CONTINUE; 789 } 790 791 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 792 wps_process_authenticator(wps, attr->authenticator, msg) || 793 wps_process_device_attrs(&wps->peer_dev, attr)) { 794 wps->state = SEND_WSC_NACK; 795 return WPS_CONTINUE; 796 } 797 798 wps->state = SEND_M3; 799 return WPS_CONTINUE; 800} 801 802 803static enum wps_process_res wps_process_m2d(struct wps_data *wps, 804 struct wps_parse_attr *attr) 805{ 806 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 807 808 if (wps->state != RECV_M2) { 809 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 810 "receiving M2D", wps->state); 811 wps->state = SEND_WSC_NACK; 812 return WPS_CONTINUE; 813 } 814 815 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 816 attr->manufacturer, attr->manufacturer_len); 817 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 818 attr->model_name, attr->model_name_len); 819 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 820 attr->model_number, attr->model_number_len); 821 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 822 attr->serial_number, attr->serial_number_len); 823 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 824 attr->dev_name, attr->dev_name_len); 825 826 if (wps->wps->event_cb) { 827 union wps_event_data data; 828 struct wps_event_m2d *m2d = &data.m2d; 829 os_memset(&data, 0, sizeof(data)); 830 if (attr->config_methods) 831 m2d->config_methods = 832 WPA_GET_BE16(attr->config_methods); 833 m2d->manufacturer = attr->manufacturer; 834 m2d->manufacturer_len = attr->manufacturer_len; 835 m2d->model_name = attr->model_name; 836 m2d->model_name_len = attr->model_name_len; 837 m2d->model_number = attr->model_number; 838 m2d->model_number_len = attr->model_number_len; 839 m2d->serial_number = attr->serial_number; 840 m2d->serial_number_len = attr->serial_number_len; 841 m2d->dev_name = attr->dev_name; 842 m2d->dev_name_len = attr->dev_name_len; 843 m2d->primary_dev_type = attr->primary_dev_type; 844 if (attr->config_error) 845 m2d->config_error = 846 WPA_GET_BE16(attr->config_error); 847 if (attr->dev_password_id) 848 m2d->dev_password_id = 849 WPA_GET_BE16(attr->dev_password_id); 850 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 851 } 852 853 wps->state = RECEIVED_M2D; 854 return WPS_CONTINUE; 855} 856 857 858static enum wps_process_res wps_process_m4(struct wps_data *wps, 859 const struct wpabuf *msg, 860 struct wps_parse_attr *attr) 861{ 862 struct wpabuf *decrypted; 863 struct wps_parse_attr eattr; 864 865 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 866 867 if (wps->state != RECV_M4) { 868 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 869 "receiving M4", wps->state); 870 wps->state = SEND_WSC_NACK; 871 return WPS_CONTINUE; 872 } 873 874 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 875 wps_process_authenticator(wps, attr->authenticator, msg) || 876 wps_process_r_hash1(wps, attr->r_hash1) || 877 wps_process_r_hash2(wps, attr->r_hash2)) { 878 wps->state = SEND_WSC_NACK; 879 return WPS_CONTINUE; 880 } 881 882 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 883 attr->encr_settings_len); 884 if (decrypted == NULL) { 885 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 886 "Settings attribute"); 887 wps->state = SEND_WSC_NACK; 888 return WPS_CONTINUE; 889 } 890 891 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 892 "attribute"); 893 if (wps_parse_msg(decrypted, &eattr) < 0 || 894 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 895 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 896 wpabuf_free(decrypted); 897 wps->state = SEND_WSC_NACK; 898 return WPS_CONTINUE; 899 } 900 wpabuf_free(decrypted); 901 902 wps->state = SEND_M5; 903 return WPS_CONTINUE; 904} 905 906 907static enum wps_process_res wps_process_m6(struct wps_data *wps, 908 const struct wpabuf *msg, 909 struct wps_parse_attr *attr) 910{ 911 struct wpabuf *decrypted; 912 struct wps_parse_attr eattr; 913 914 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 915 916 if (wps->state != RECV_M6) { 917 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 918 "receiving M6", wps->state); 919 wps->state = SEND_WSC_NACK; 920 return WPS_CONTINUE; 921 } 922 923 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 924 wps_process_authenticator(wps, attr->authenticator, msg)) { 925 wps->state = SEND_WSC_NACK; 926 return WPS_CONTINUE; 927 } 928 929 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 930 attr->encr_settings_len); 931 if (decrypted == NULL) { 932 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 933 "Settings attribute"); 934 wps->state = SEND_WSC_NACK; 935 return WPS_CONTINUE; 936 } 937 938 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 939 "attribute"); 940 if (wps_parse_msg(decrypted, &eattr) < 0 || 941 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 942 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 943 wpabuf_free(decrypted); 944 wps->state = SEND_WSC_NACK; 945 return WPS_CONTINUE; 946 } 947 wpabuf_free(decrypted); 948 949 wps->state = SEND_M7; 950 return WPS_CONTINUE; 951} 952 953 954static enum wps_process_res wps_process_m8(struct wps_data *wps, 955 const struct wpabuf *msg, 956 struct wps_parse_attr *attr) 957{ 958 struct wpabuf *decrypted; 959 struct wps_parse_attr eattr; 960 961 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 962 963 if (wps->state != RECV_M8) { 964 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 965 "receiving M8", wps->state); 966 wps->state = SEND_WSC_NACK; 967 return WPS_CONTINUE; 968 } 969 970 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 971 wps_process_authenticator(wps, attr->authenticator, msg)) { 972 wps->state = SEND_WSC_NACK; 973 return WPS_CONTINUE; 974 } 975 976 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 977 attr->encr_settings_len); 978 if (decrypted == NULL) { 979 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 980 "Settings attribute"); 981 wps->state = SEND_WSC_NACK; 982 return WPS_CONTINUE; 983 } 984 985 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 986 "attribute"); 987 if (wps_parse_msg(decrypted, &eattr) < 0 || 988 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 989 wps_process_creds(wps, eattr.cred, eattr.cred_len, 990 eattr.num_cred) || 991 wps_process_ap_settings_e(wps, &eattr, decrypted)) { 992 wpabuf_free(decrypted); 993 wps->state = SEND_WSC_NACK; 994 return WPS_CONTINUE; 995 } 996 wpabuf_free(decrypted); 997 998 wps->state = WPS_MSG_DONE; 999 return WPS_CONTINUE; 1000} 1001 1002 1003static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1004 const struct wpabuf *msg) 1005{ 1006 struct wps_parse_attr attr; 1007 enum wps_process_res ret = WPS_CONTINUE; 1008 1009 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1010 1011 if (wps_parse_msg(msg, &attr) < 0) 1012 return WPS_FAILURE; 1013 1014 if (!wps_version_supported(attr.version)) { 1015 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 1016 attr.version ? *attr.version : 0); 1017 return WPS_FAILURE; 1018 } 1019 1020 if (attr.enrollee_nonce == NULL || 1021 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1022 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1023 return WPS_FAILURE; 1024 } 1025 1026 if (attr.msg_type == NULL) { 1027 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1028 return WPS_FAILURE; 1029 } 1030 1031 switch (*attr.msg_type) { 1032 case WPS_M2: 1033 ret = wps_process_m2(wps, msg, &attr); 1034 break; 1035 case WPS_M2D: 1036 ret = wps_process_m2d(wps, &attr); 1037 break; 1038 case WPS_M4: 1039 ret = wps_process_m4(wps, msg, &attr); 1040 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1041 wps_fail_event(wps->wps, WPS_M4); 1042 break; 1043 case WPS_M6: 1044 ret = wps_process_m6(wps, msg, &attr); 1045 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1046 wps_fail_event(wps->wps, WPS_M6); 1047 break; 1048 case WPS_M8: 1049 ret = wps_process_m8(wps, msg, &attr); 1050 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1051 wps_fail_event(wps->wps, WPS_M8); 1052 break; 1053 default: 1054 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1055 *attr.msg_type); 1056 return WPS_FAILURE; 1057 } 1058 1059 /* 1060 * Save a copy of the last message for Authenticator derivation if we 1061 * are continuing. However, skip M2D since it is not authenticated and 1062 * neither is the ACK/NACK response frame. This allows the possibly 1063 * following M2 to be processed correctly by using the previously sent 1064 * M1 in Authenticator derivation. 1065 */ 1066 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1067 /* Save a copy of the last message for Authenticator derivation 1068 */ 1069 wpabuf_free(wps->last_msg); 1070 wps->last_msg = wpabuf_dup(msg); 1071 } 1072 1073 return ret; 1074} 1075 1076 1077static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1078 const struct wpabuf *msg) 1079{ 1080 struct wps_parse_attr attr; 1081 1082 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1083 1084 if (wps_parse_msg(msg, &attr) < 0) 1085 return WPS_FAILURE; 1086 1087 if (!wps_version_supported(attr.version)) { 1088 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 1089 attr.version ? *attr.version : 0); 1090 return WPS_FAILURE; 1091 } 1092 1093 if (attr.msg_type == NULL) { 1094 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1095 return WPS_FAILURE; 1096 } 1097 1098 if (*attr.msg_type != WPS_WSC_ACK) { 1099 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1100 *attr.msg_type); 1101 return WPS_FAILURE; 1102 } 1103 1104 if (attr.registrar_nonce == NULL || 1105 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1106 { 1107 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1108 return WPS_FAILURE; 1109 } 1110 1111 if (attr.enrollee_nonce == NULL || 1112 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1113 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1114 return WPS_FAILURE; 1115 } 1116 1117 if (wps->state == RECV_ACK && wps->wps->ap) { 1118 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1119 "completed successfully"); 1120 wps_success_event(wps->wps); 1121 wps->state = WPS_FINISHED; 1122 return WPS_DONE; 1123 } 1124 1125 return WPS_FAILURE; 1126} 1127 1128 1129static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1130 const struct wpabuf *msg) 1131{ 1132 struct wps_parse_attr attr; 1133 1134 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1135 1136 if (wps_parse_msg(msg, &attr) < 0) 1137 return WPS_FAILURE; 1138 1139 if (!wps_version_supported(attr.version)) { 1140 wpa_printf(MSG_DEBUG, "WPS: Unsupported message version 0x%x", 1141 attr.version ? *attr.version : 0); 1142 return WPS_FAILURE; 1143 } 1144 1145 if (attr.msg_type == NULL) { 1146 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1147 return WPS_FAILURE; 1148 } 1149 1150 if (*attr.msg_type != WPS_WSC_NACK) { 1151 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1152 *attr.msg_type); 1153 return WPS_FAILURE; 1154 } 1155 1156 if (attr.registrar_nonce == NULL || 1157 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1158 { 1159 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1160 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1161 attr.registrar_nonce, WPS_NONCE_LEN); 1162 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1163 wps->nonce_r, WPS_NONCE_LEN); 1164 return WPS_FAILURE; 1165 } 1166 1167 if (attr.enrollee_nonce == NULL || 1168 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1169 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1170 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1171 attr.enrollee_nonce, WPS_NONCE_LEN); 1172 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1173 wps->nonce_e, WPS_NONCE_LEN); 1174 return WPS_FAILURE; 1175 } 1176 1177 if (attr.config_error == NULL) { 1178 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1179 "in WSC_NACK"); 1180 return WPS_FAILURE; 1181 } 1182 1183 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1184 "Configuration Error %d", WPA_GET_BE16(attr.config_error)); 1185 1186 switch (wps->state) { 1187 case RECV_M4: 1188 wps_fail_event(wps->wps, WPS_M3); 1189 break; 1190 case RECV_M6: 1191 wps_fail_event(wps->wps, WPS_M5); 1192 break; 1193 case RECV_M8: 1194 wps_fail_event(wps->wps, WPS_M7); 1195 break; 1196 default: 1197 break; 1198 } 1199 1200 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1201 * Enrollee is Authenticator */ 1202 wps->state = SEND_WSC_NACK; 1203 1204 return WPS_FAILURE; 1205} 1206 1207 1208enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1209 enum wsc_op_code op_code, 1210 const struct wpabuf *msg) 1211{ 1212 1213 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1214 "op_code=%d)", 1215 (unsigned long) wpabuf_len(msg), op_code); 1216 1217 if (op_code == WSC_UPnP) { 1218 /* Determine the OpCode based on message type attribute */ 1219 struct wps_parse_attr attr; 1220 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1221 if (*attr.msg_type == WPS_WSC_ACK) 1222 op_code = WSC_ACK; 1223 else if (*attr.msg_type == WPS_WSC_NACK) 1224 op_code = WSC_NACK; 1225 } 1226 } 1227 1228 switch (op_code) { 1229 case WSC_MSG: 1230 case WSC_UPnP: 1231 return wps_process_wsc_msg(wps, msg); 1232 case WSC_ACK: 1233 return wps_process_wsc_ack(wps, msg); 1234 case WSC_NACK: 1235 return wps_process_wsc_nack(wps, msg); 1236 default: 1237 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1238 return WPS_FAILURE; 1239 } 1240} 1241