wps_enrollee.c revision 8d520ff1dc2da35cdca849e982051b86468016d8
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 "crypto/random.h" 21#include "wps_i.h" 22#include "wps_dev_attr.h" 23 24 25static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg) 26{ 27 wpa_printf(MSG_DEBUG, "WPS: * MAC Address"); 28 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 29 wpabuf_put_be16(msg, ETH_ALEN); 30 wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN); 31 return 0; 32} 33 34 35static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 36{ 37 u8 state; 38 if (wps->wps->ap) 39 state = wps->wps->wps_state; 40 else 41 state = WPS_STATE_NOT_CONFIGURED; 42 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 43 state); 44 wpabuf_put_be16(msg, ATTR_WPS_STATE); 45 wpabuf_put_be16(msg, 1); 46 wpabuf_put_u8(msg, state); 47 return 0; 48} 49 50 51static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 52{ 53 u8 *hash; 54 const u8 *addr[4]; 55 size_t len[4]; 56 57 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 58 return -1; 59 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 60 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 61 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 62 63 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 64 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 65 "E-Hash derivation"); 66 return -1; 67 } 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 70 wpabuf_put_be16(msg, ATTR_E_HASH1); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 74 addr[0] = wps->snonce; 75 len[0] = WPS_SECRET_NONCE_LEN; 76 addr[1] = wps->psk1; 77 len[1] = WPS_PSK_LEN; 78 addr[2] = wpabuf_head(wps->dh_pubkey_e); 79 len[2] = wpabuf_len(wps->dh_pubkey_e); 80 addr[3] = wpabuf_head(wps->dh_pubkey_r); 81 len[3] = wpabuf_len(wps->dh_pubkey_r); 82 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 83 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 84 85 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 86 wpabuf_put_be16(msg, ATTR_E_HASH2); 87 wpabuf_put_be16(msg, SHA256_MAC_LEN); 88 hash = wpabuf_put(msg, SHA256_MAC_LEN); 89 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 90 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 91 addr[1] = wps->psk2; 92 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 93 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 94 95 return 0; 96} 97 98 99static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 100{ 101 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 102 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 103 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 104 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 105 return 0; 106} 107 108 109static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 110{ 111 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 112 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 113 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 114 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 115 WPS_SECRET_NONCE_LEN); 116 return 0; 117} 118 119 120static struct wpabuf * wps_build_m1(struct wps_data *wps) 121{ 122 struct wpabuf *msg; 123 u16 config_methods; 124 125 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 126 return NULL; 127 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 128 wps->nonce_e, WPS_NONCE_LEN); 129 130 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 131 msg = wpabuf_alloc(1000); 132 if (msg == NULL) 133 return NULL; 134 135 config_methods = wps->wps->config_methods; 136 if (wps->wps->ap) { 137 /* 138 * These are the methods that the AP supports as an Enrollee 139 * for adding external Registrars, so remove PushButton. 140 */ 141 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 142#ifdef CONFIG_WPS2 143 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 144 WPS_CONFIG_PHY_PUSHBUTTON); 145#endif /* CONFIG_WPS2 */ 146 } 147 148 if (wps_build_version(msg) || 149 wps_build_msg_type(msg, WPS_M1) || 150 wps_build_uuid_e(msg, wps->uuid_e) || 151 wps_build_mac_addr(wps, msg) || 152 wps_build_enrollee_nonce(wps, msg) || 153 wps_build_public_key(wps, msg) || 154 wps_build_auth_type_flags(wps, msg) || 155 wps_build_encr_type_flags(wps, msg) || 156 wps_build_conn_type_flags(wps, msg) || 157 wps_build_config_methods(msg, config_methods) || 158 wps_build_wps_state(wps, msg) || 159 wps_build_device_attrs(&wps->wps->dev, msg) || 160 wps_build_rf_bands(&wps->wps->dev, msg) || 161 wps_build_assoc_state(wps, msg) || 162 wps_build_dev_password_id(msg, wps->dev_pw_id) || 163 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 164 wps_build_os_version(&wps->wps->dev, msg) || 165 wps_build_wfa_ext(msg, 0, NULL, 0)) { 166 wpabuf_free(msg); 167 return NULL; 168 } 169 170 wps->state = RECV_M2; 171 return msg; 172} 173 174 175static struct wpabuf * wps_build_m3(struct wps_data *wps) 176{ 177 struct wpabuf *msg; 178 179 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 180 181 if (wps->dev_password == NULL) { 182 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 183 return NULL; 184 } 185 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 186 187 msg = wpabuf_alloc(1000); 188 if (msg == NULL) 189 return NULL; 190 191 if (wps_build_version(msg) || 192 wps_build_msg_type(msg, WPS_M3) || 193 wps_build_registrar_nonce(wps, msg) || 194 wps_build_e_hash(wps, msg) || 195 wps_build_wfa_ext(msg, 0, NULL, 0) || 196 wps_build_authenticator(wps, msg)) { 197 wpabuf_free(msg); 198 return NULL; 199 } 200 201 wps->state = RECV_M4; 202 return msg; 203} 204 205 206static struct wpabuf * wps_build_m5(struct wps_data *wps) 207{ 208 struct wpabuf *msg, *plain; 209 210 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 211 212 plain = wpabuf_alloc(200); 213 if (plain == NULL) 214 return NULL; 215 216 msg = wpabuf_alloc(1000); 217 if (msg == NULL) { 218 wpabuf_free(plain); 219 return NULL; 220 } 221 222 if (wps_build_version(msg) || 223 wps_build_msg_type(msg, WPS_M5) || 224 wps_build_registrar_nonce(wps, msg) || 225 wps_build_e_snonce1(wps, plain) || 226 wps_build_key_wrap_auth(wps, plain) || 227 wps_build_encr_settings(wps, msg, plain) || 228 wps_build_wfa_ext(msg, 0, NULL, 0) || 229 wps_build_authenticator(wps, msg)) { 230 wpabuf_free(plain); 231 wpabuf_free(msg); 232 return NULL; 233 } 234 wpabuf_free(plain); 235 236 wps->state = RECV_M6; 237 return msg; 238} 239 240 241static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 242{ 243 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 244 wpabuf_put_be16(msg, ATTR_SSID); 245 wpabuf_put_be16(msg, wps->wps->ssid_len); 246 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 247 return 0; 248} 249 250 251static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 252{ 253 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type"); 254 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 255 wpabuf_put_be16(msg, 2); 256 wpabuf_put_be16(msg, wps->wps->auth_types); 257 return 0; 258} 259 260 261static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 262{ 263 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type"); 264 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 265 wpabuf_put_be16(msg, 2); 266 wpabuf_put_be16(msg, wps->wps->encr_types); 267 return 0; 268} 269 270 271static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 272{ 273 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 274 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 275 wpabuf_put_be16(msg, wps->wps->network_key_len); 276 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 277 return 0; 278} 279 280 281static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 282{ 283 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 284 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 285 wpabuf_put_be16(msg, ETH_ALEN); 286 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 287 return 0; 288} 289 290 291static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 292{ 293 if (wps->wps->ap_settings) { 294 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 295 wpabuf_put_data(plain, wps->wps->ap_settings, 296 wps->wps->ap_settings_len); 297 return 0; 298 } 299 300 return wps_build_cred_ssid(wps, plain) || 301 wps_build_cred_mac_addr(wps, plain) || 302 wps_build_cred_auth_type(wps, plain) || 303 wps_build_cred_encr_type(wps, plain) || 304 wps_build_cred_network_key(wps, plain); 305} 306 307 308static struct wpabuf * wps_build_m7(struct wps_data *wps) 309{ 310 struct wpabuf *msg, *plain; 311 312 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 313 314 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 315 if (plain == NULL) 316 return NULL; 317 318 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 319 if (msg == NULL) { 320 wpabuf_free(plain); 321 return NULL; 322 } 323 324 if (wps_build_version(msg) || 325 wps_build_msg_type(msg, WPS_M7) || 326 wps_build_registrar_nonce(wps, msg) || 327 wps_build_e_snonce2(wps, plain) || 328 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 329 wps_build_key_wrap_auth(wps, plain) || 330 wps_build_encr_settings(wps, msg, plain) || 331 wps_build_wfa_ext(msg, 0, NULL, 0) || 332 wps_build_authenticator(wps, msg)) { 333 wpabuf_free(plain); 334 wpabuf_free(msg); 335 return NULL; 336 } 337 wpabuf_free(plain); 338 339 if (wps->wps->ap && wps->wps->registrar) { 340 /* 341 * If the Registrar is only learning our current configuration, 342 * it may not continue protocol run to successful completion. 343 * Store information here to make sure it remains available. 344 */ 345 wps_device_store(wps->wps->registrar, &wps->peer_dev, 346 wps->uuid_r); 347 } 348 349 wps->state = RECV_M8; 350 return msg; 351} 352 353 354static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 355{ 356 struct wpabuf *msg; 357 358 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 359 360 msg = wpabuf_alloc(1000); 361 if (msg == NULL) 362 return NULL; 363 364 if (wps_build_version(msg) || 365 wps_build_msg_type(msg, WPS_WSC_DONE) || 366 wps_build_enrollee_nonce(wps, msg) || 367 wps_build_registrar_nonce(wps, msg) || 368 wps_build_wfa_ext(msg, 0, NULL, 0)) { 369 wpabuf_free(msg); 370 return NULL; 371 } 372 373 if (wps->wps->ap) 374 wps->state = RECV_ACK; 375 else { 376 wps_success_event(wps->wps); 377 wps->state = WPS_FINISHED; 378 } 379 return msg; 380} 381 382 383struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 384 enum wsc_op_code *op_code) 385{ 386 struct wpabuf *msg; 387 388 switch (wps->state) { 389 case SEND_M1: 390 msg = wps_build_m1(wps); 391 *op_code = WSC_MSG; 392 break; 393 case SEND_M3: 394 msg = wps_build_m3(wps); 395 *op_code = WSC_MSG; 396 break; 397 case SEND_M5: 398 msg = wps_build_m5(wps); 399 *op_code = WSC_MSG; 400 break; 401 case SEND_M7: 402 msg = wps_build_m7(wps); 403 *op_code = WSC_MSG; 404 break; 405 case RECEIVED_M2D: 406 if (wps->wps->ap) { 407 msg = wps_build_wsc_nack(wps); 408 *op_code = WSC_NACK; 409 break; 410 } 411 msg = wps_build_wsc_ack(wps); 412 *op_code = WSC_ACK; 413 if (msg) { 414 /* Another M2/M2D may be received */ 415 wps->state = RECV_M2; 416 } 417 break; 418 case SEND_WSC_NACK: 419 msg = wps_build_wsc_nack(wps); 420 *op_code = WSC_NACK; 421 break; 422 case WPS_MSG_DONE: 423 msg = wps_build_wsc_done(wps); 424 *op_code = WSC_Done; 425 break; 426 default: 427 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 428 "a message", wps->state); 429 msg = NULL; 430 break; 431 } 432 433 if (*op_code == WSC_MSG && msg) { 434 /* Save a copy of the last message for Authenticator derivation 435 */ 436 wpabuf_free(wps->last_msg); 437 wps->last_msg = wpabuf_dup(msg); 438 } 439 440 return msg; 441} 442 443 444static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 445{ 446 if (r_nonce == NULL) { 447 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 448 return -1; 449 } 450 451 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 452 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 453 wps->nonce_r, WPS_NONCE_LEN); 454 455 return 0; 456} 457 458 459static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 460{ 461 if (e_nonce == NULL) { 462 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 463 return -1; 464 } 465 466 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 467 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 468 return -1; 469 } 470 471 return 0; 472} 473 474 475static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 476{ 477 if (uuid_r == NULL) { 478 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 479 return -1; 480 } 481 482 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 483 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 484 485 return 0; 486} 487 488 489static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 490 size_t pk_len) 491{ 492 if (pk == NULL || pk_len == 0) { 493 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 494 return -1; 495 } 496 497#ifdef CONFIG_WPS_OOB 498 if (wps->dev_pw_id != DEV_PW_DEFAULT && 499 wps->wps->oob_conf.pubkey_hash) { 500 const u8 *addr[1]; 501 u8 hash[WPS_HASH_LEN]; 502 503 addr[0] = pk; 504 sha256_vector(1, addr, &pk_len, hash); 505 if (os_memcmp(hash, 506 wpabuf_head(wps->wps->oob_conf.pubkey_hash), 507 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 508 wpa_printf(MSG_ERROR, "WPS: Public Key hash error"); 509 return -1; 510 } 511 } 512#endif /* CONFIG_WPS_OOB */ 513 514 wpabuf_free(wps->dh_pubkey_r); 515 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 516 if (wps->dh_pubkey_r == NULL) 517 return -1; 518 519 if (wps_derive_keys(wps) < 0) 520 return -1; 521 522 return 0; 523} 524 525 526static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 527{ 528 if (r_hash1 == NULL) { 529 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 530 return -1; 531 } 532 533 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 534 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 535 536 return 0; 537} 538 539 540static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 541{ 542 if (r_hash2 == NULL) { 543 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 544 return -1; 545 } 546 547 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 548 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 549 550 return 0; 551} 552 553 554static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 555{ 556 u8 hash[SHA256_MAC_LEN]; 557 const u8 *addr[4]; 558 size_t len[4]; 559 560 if (r_snonce1 == NULL) { 561 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 562 return -1; 563 } 564 565 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 566 WPS_SECRET_NONCE_LEN); 567 568 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 569 addr[0] = r_snonce1; 570 len[0] = WPS_SECRET_NONCE_LEN; 571 addr[1] = wps->psk1; 572 len[1] = WPS_PSK_LEN; 573 addr[2] = wpabuf_head(wps->dh_pubkey_e); 574 len[2] = wpabuf_len(wps->dh_pubkey_e); 575 addr[3] = wpabuf_head(wps->dh_pubkey_r); 576 len[3] = wpabuf_len(wps->dh_pubkey_r); 577 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 578 579 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 580 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 581 "not match with the pre-committed value"); 582 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 583 wps_pwd_auth_fail_event(wps->wps, 1, 1); 584 return -1; 585 } 586 587 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 588 "half of the device password"); 589 590 return 0; 591} 592 593 594static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 595{ 596 u8 hash[SHA256_MAC_LEN]; 597 const u8 *addr[4]; 598 size_t len[4]; 599 600 if (r_snonce2 == NULL) { 601 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 602 return -1; 603 } 604 605 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 606 WPS_SECRET_NONCE_LEN); 607 608 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 609 addr[0] = r_snonce2; 610 len[0] = WPS_SECRET_NONCE_LEN; 611 addr[1] = wps->psk2; 612 len[1] = WPS_PSK_LEN; 613 addr[2] = wpabuf_head(wps->dh_pubkey_e); 614 len[2] = wpabuf_len(wps->dh_pubkey_e); 615 addr[3] = wpabuf_head(wps->dh_pubkey_r); 616 len[3] = wpabuf_len(wps->dh_pubkey_r); 617 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 618 619 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 620 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 621 "not match with the pre-committed value"); 622 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 623 wps_pwd_auth_fail_event(wps->wps, 1, 2); 624 return -1; 625 } 626 627 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 628 "half of the device password"); 629 630 return 0; 631} 632 633 634static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 635 size_t cred_len, int wps2) 636{ 637 struct wps_parse_attr attr; 638 struct wpabuf msg; 639 640 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 641 os_memset(&wps->cred, 0, sizeof(wps->cred)); 642 wpabuf_set(&msg, cred, cred_len); 643 if (wps_parse_msg(&msg, &attr) < 0 || 644 wps_process_cred(&attr, &wps->cred)) 645 return -1; 646 647 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 648 0) { 649 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 650 MACSTR ") does not match with own address (" MACSTR 651 ")", MAC2STR(wps->cred.mac_addr), 652 MAC2STR(wps->wps->dev.mac_addr)); 653 /* 654 * In theory, this could be consider fatal error, but there are 655 * number of deployed implementations using other address here 656 * due to unclarity in the specification. For interoperability 657 * reasons, allow this to be processed since we do not really 658 * use the MAC Address information for anything. 659 */ 660#ifdef CONFIG_WPS_STRICT 661 if (wps2) { 662 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 663 "MAC Address in AP Settings"); 664 return -1; 665 } 666#endif /* CONFIG_WPS_STRICT */ 667 } 668 669#ifdef CONFIG_WPS2 670 if (!(wps->cred.encr_type & 671 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 672 if (wps->cred.encr_type & WPS_ENCR_WEP) { 673 wpa_printf(MSG_INFO, "WPS: Reject Credential " 674 "due to WEP configuration"); 675 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 676 return -2; 677 } 678 679 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 680 "invalid encr_type 0x%x", wps->cred.encr_type); 681 return -1; 682 } 683#endif /* CONFIG_WPS2 */ 684 685 if (wps->wps->cred_cb) { 686 wps->cred.cred_attr = cred - 4; 687 wps->cred.cred_attr_len = cred_len + 4; 688 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 689 wps->cred.cred_attr = NULL; 690 wps->cred.cred_attr_len = 0; 691 } 692 693 return 0; 694} 695 696 697static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 698 size_t cred_len[], size_t num_cred, int wps2) 699{ 700 size_t i; 701 int ok = 0; 702 703 if (wps->wps->ap) 704 return 0; 705 706 if (num_cred == 0) { 707 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 708 "received"); 709 return -1; 710 } 711 712 for (i = 0; i < num_cred; i++) { 713 int res; 714 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 715 if (res == 0) 716 ok++; 717 else if (res == -2) 718 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 719 else 720 return -1; 721 } 722 723 if (ok == 0) { 724 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 725 "received"); 726 return -1; 727 } 728 729 return 0; 730} 731 732 733static int wps_process_ap_settings_e(struct wps_data *wps, 734 struct wps_parse_attr *attr, 735 struct wpabuf *attrs, int wps2) 736{ 737 struct wps_credential cred; 738 739 if (!wps->wps->ap) 740 return 0; 741 742 if (wps_process_ap_settings(attr, &cred) < 0) 743 return -1; 744 745 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 746 "Registrar"); 747 748 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 749 0) { 750 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 751 MACSTR ") does not match with own address (" MACSTR 752 ")", MAC2STR(cred.mac_addr), 753 MAC2STR(wps->wps->dev.mac_addr)); 754 /* 755 * In theory, this could be consider fatal error, but there are 756 * number of deployed implementations using other address here 757 * due to unclarity in the specification. For interoperability 758 * reasons, allow this to be processed since we do not really 759 * use the MAC Address information for anything. 760 */ 761#ifdef CONFIG_WPS_STRICT 762 if (wps2) { 763 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 764 "MAC Address in AP Settings"); 765 return -1; 766 } 767#endif /* CONFIG_WPS_STRICT */ 768 } 769 770#ifdef CONFIG_WPS2 771 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 772 { 773 if (cred.encr_type & WPS_ENCR_WEP) { 774 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 775 "due to WEP configuration"); 776 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 777 return -1; 778 } 779 780 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 781 "invalid encr_type 0x%x", cred.encr_type); 782 return -1; 783 } 784#endif /* CONFIG_WPS2 */ 785 786#ifdef CONFIG_WPS_STRICT 787 if (wps2) { 788 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 789 WPS_ENCR_TKIP || 790 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 791 WPS_AUTH_WPAPSK) { 792 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 793 "AP Settings: WPA-Personal/TKIP only"); 794 wps->error_indication = 795 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 796 return -1; 797 } 798 } 799#endif /* CONFIG_WPS_STRICT */ 800 801#ifdef CONFIG_WPS2 802 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 803 { 804 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 805 "TKIP+AES"); 806 cred.encr_type |= WPS_ENCR_AES; 807 } 808 809 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 810 WPS_AUTH_WPAPSK) { 811 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 812 "WPAPSK+WPA2PSK"); 813 cred.auth_type |= WPS_AUTH_WPA2PSK; 814 } 815#endif /* CONFIG_WPS2 */ 816 817 if (wps->wps->cred_cb) { 818 cred.cred_attr = wpabuf_head(attrs); 819 cred.cred_attr_len = wpabuf_len(attrs); 820 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 821 } 822 823 return 0; 824} 825 826 827static enum wps_process_res wps_process_m2(struct wps_data *wps, 828 const struct wpabuf *msg, 829 struct wps_parse_attr *attr) 830{ 831 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 832 833 if (wps->state != RECV_M2) { 834 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 835 "receiving M2", wps->state); 836 wps->state = SEND_WSC_NACK; 837 return WPS_CONTINUE; 838 } 839 840 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 841 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 842 wps_process_uuid_r(wps, attr->uuid_r)) { 843 wps->state = SEND_WSC_NACK; 844 return WPS_CONTINUE; 845 } 846 847 /* 848 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 849 * special locked mode is used to allow protocol run up to M7 in order 850 * to support external Registrars that only learn the current AP 851 * configuration without changing it. 852 */ 853 if (wps->wps->ap && 854 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 855 wps->dev_password == NULL)) { 856 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 857 "registration of a new Registrar"); 858 wps->config_error = WPS_CFG_SETUP_LOCKED; 859 wps->state = SEND_WSC_NACK; 860 return WPS_CONTINUE; 861 } 862 863 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 864 wps_process_authenticator(wps, attr->authenticator, msg) || 865 wps_process_device_attrs(&wps->peer_dev, attr)) { 866 wps->state = SEND_WSC_NACK; 867 return WPS_CONTINUE; 868 } 869 870 wps->state = SEND_M3; 871 return WPS_CONTINUE; 872} 873 874 875static enum wps_process_res wps_process_m2d(struct wps_data *wps, 876 struct wps_parse_attr *attr) 877{ 878 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 879 880 if (wps->state != RECV_M2) { 881 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 882 "receiving M2D", wps->state); 883 wps->state = SEND_WSC_NACK; 884 return WPS_CONTINUE; 885 } 886 887 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 888 attr->manufacturer, attr->manufacturer_len); 889 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 890 attr->model_name, attr->model_name_len); 891 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 892 attr->model_number, attr->model_number_len); 893 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 894 attr->serial_number, attr->serial_number_len); 895 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 896 attr->dev_name, attr->dev_name_len); 897 898 if (wps->wps->event_cb) { 899 union wps_event_data data; 900 struct wps_event_m2d *m2d = &data.m2d; 901 os_memset(&data, 0, sizeof(data)); 902 if (attr->config_methods) 903 m2d->config_methods = 904 WPA_GET_BE16(attr->config_methods); 905 m2d->manufacturer = attr->manufacturer; 906 m2d->manufacturer_len = attr->manufacturer_len; 907 m2d->model_name = attr->model_name; 908 m2d->model_name_len = attr->model_name_len; 909 m2d->model_number = attr->model_number; 910 m2d->model_number_len = attr->model_number_len; 911 m2d->serial_number = attr->serial_number; 912 m2d->serial_number_len = attr->serial_number_len; 913 m2d->dev_name = attr->dev_name; 914 m2d->dev_name_len = attr->dev_name_len; 915 m2d->primary_dev_type = attr->primary_dev_type; 916 if (attr->config_error) 917 m2d->config_error = 918 WPA_GET_BE16(attr->config_error); 919 if (attr->dev_password_id) 920 m2d->dev_password_id = 921 WPA_GET_BE16(attr->dev_password_id); 922 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 923 } 924 925 wps->state = RECEIVED_M2D; 926 return WPS_CONTINUE; 927} 928 929 930static enum wps_process_res wps_process_m4(struct wps_data *wps, 931 const struct wpabuf *msg, 932 struct wps_parse_attr *attr) 933{ 934 struct wpabuf *decrypted; 935 struct wps_parse_attr eattr; 936 937 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 938 939 if (wps->state != RECV_M4) { 940 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 941 "receiving M4", wps->state); 942 wps->state = SEND_WSC_NACK; 943 return WPS_CONTINUE; 944 } 945 946 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 947 wps_process_authenticator(wps, attr->authenticator, msg) || 948 wps_process_r_hash1(wps, attr->r_hash1) || 949 wps_process_r_hash2(wps, attr->r_hash2)) { 950 wps->state = SEND_WSC_NACK; 951 return WPS_CONTINUE; 952 } 953 954 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 955 attr->encr_settings_len); 956 if (decrypted == NULL) { 957 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 958 "Settings attribute"); 959 wps->state = SEND_WSC_NACK; 960 return WPS_CONTINUE; 961 } 962 963 if (wps_validate_m4_encr(decrypted, attr->version2 != 0) < 0) { 964 wpabuf_free(decrypted); 965 wps->state = SEND_WSC_NACK; 966 return WPS_CONTINUE; 967 } 968 969 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 970 "attribute"); 971 if (wps_parse_msg(decrypted, &eattr) < 0 || 972 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 973 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 974 wpabuf_free(decrypted); 975 wps->state = SEND_WSC_NACK; 976 return WPS_CONTINUE; 977 } 978 wpabuf_free(decrypted); 979 980 wps->state = SEND_M5; 981 return WPS_CONTINUE; 982} 983 984 985static enum wps_process_res wps_process_m6(struct wps_data *wps, 986 const struct wpabuf *msg, 987 struct wps_parse_attr *attr) 988{ 989 struct wpabuf *decrypted; 990 struct wps_parse_attr eattr; 991 992 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 993 994 if (wps->state != RECV_M6) { 995 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 996 "receiving M6", wps->state); 997 wps->state = SEND_WSC_NACK; 998 return WPS_CONTINUE; 999 } 1000 1001 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1002 wps_process_authenticator(wps, attr->authenticator, msg)) { 1003 wps->state = SEND_WSC_NACK; 1004 return WPS_CONTINUE; 1005 } 1006 1007 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1008 attr->encr_settings_len); 1009 if (decrypted == NULL) { 1010 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1011 "Settings attribute"); 1012 wps->state = SEND_WSC_NACK; 1013 return WPS_CONTINUE; 1014 } 1015 1016 if (wps_validate_m6_encr(decrypted, attr->version2 != 0) < 0) { 1017 wpabuf_free(decrypted); 1018 wps->state = SEND_WSC_NACK; 1019 return WPS_CONTINUE; 1020 } 1021 1022 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1023 "attribute"); 1024 if (wps_parse_msg(decrypted, &eattr) < 0 || 1025 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1026 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1027 wpabuf_free(decrypted); 1028 wps->state = SEND_WSC_NACK; 1029 return WPS_CONTINUE; 1030 } 1031 wpabuf_free(decrypted); 1032 1033 wps->state = SEND_M7; 1034 return WPS_CONTINUE; 1035} 1036 1037 1038static enum wps_process_res wps_process_m8(struct wps_data *wps, 1039 const struct wpabuf *msg, 1040 struct wps_parse_attr *attr) 1041{ 1042 struct wpabuf *decrypted; 1043 struct wps_parse_attr eattr; 1044 1045 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1046 1047 if (wps->state != RECV_M8) { 1048 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1049 "receiving M8", wps->state); 1050 wps->state = SEND_WSC_NACK; 1051 return WPS_CONTINUE; 1052 } 1053 1054 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1055 wps_process_authenticator(wps, attr->authenticator, msg)) { 1056 wps->state = SEND_WSC_NACK; 1057 return WPS_CONTINUE; 1058 } 1059 1060 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1061 /* 1062 * Stop here if special ap_setup_locked == 2 mode allowed the 1063 * protocol to continue beyond M2. This allows ER to learn the 1064 * current AP settings without changing them. 1065 */ 1066 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1067 "registration of a new Registrar"); 1068 wps->config_error = WPS_CFG_SETUP_LOCKED; 1069 wps->state = SEND_WSC_NACK; 1070 return WPS_CONTINUE; 1071 } 1072 1073 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1074 attr->encr_settings_len); 1075 if (decrypted == NULL) { 1076 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1077 "Settings attribute"); 1078 wps->state = SEND_WSC_NACK; 1079 return WPS_CONTINUE; 1080 } 1081 1082 if (wps_validate_m8_encr(decrypted, wps->wps->ap, attr->version2 != 0) 1083 < 0) { 1084 wpabuf_free(decrypted); 1085 wps->state = SEND_WSC_NACK; 1086 return WPS_CONTINUE; 1087 } 1088 1089 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1090 "attribute"); 1091 if (wps_parse_msg(decrypted, &eattr) < 0 || 1092 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1093 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1094 eattr.num_cred, attr->version2 != NULL) || 1095 wps_process_ap_settings_e(wps, &eattr, decrypted, 1096 attr->version2 != NULL)) { 1097 wpabuf_free(decrypted); 1098 wps->state = SEND_WSC_NACK; 1099 return WPS_CONTINUE; 1100 } 1101 wpabuf_free(decrypted); 1102 1103 wps->state = WPS_MSG_DONE; 1104 return WPS_CONTINUE; 1105} 1106 1107 1108static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1109 const struct wpabuf *msg) 1110{ 1111 struct wps_parse_attr attr; 1112 enum wps_process_res ret = WPS_CONTINUE; 1113 1114 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1115 1116 if (wps_parse_msg(msg, &attr) < 0) 1117 return WPS_FAILURE; 1118 1119 if (attr.enrollee_nonce == NULL || 1120 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1121 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1122 return WPS_FAILURE; 1123 } 1124 1125 if (attr.msg_type == NULL) { 1126 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1127 wps->state = SEND_WSC_NACK; 1128 return WPS_CONTINUE; 1129 } 1130 1131 switch (*attr.msg_type) { 1132 case WPS_M2: 1133 if (wps_validate_m2(msg) < 0) 1134 return WPS_FAILURE; 1135 ret = wps_process_m2(wps, msg, &attr); 1136 break; 1137 case WPS_M2D: 1138 if (wps_validate_m2d(msg) < 0) 1139 return WPS_FAILURE; 1140 ret = wps_process_m2d(wps, &attr); 1141 break; 1142 case WPS_M4: 1143 if (wps_validate_m4(msg) < 0) 1144 return WPS_FAILURE; 1145 ret = wps_process_m4(wps, msg, &attr); 1146 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1147 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1148 wps->error_indication); 1149 break; 1150 case WPS_M6: 1151 if (wps_validate_m6(msg) < 0) 1152 return WPS_FAILURE; 1153 ret = wps_process_m6(wps, msg, &attr); 1154 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1155 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1156 wps->error_indication); 1157 break; 1158 case WPS_M8: 1159 if (wps_validate_m8(msg) < 0) 1160 return WPS_FAILURE; 1161 ret = wps_process_m8(wps, msg, &attr); 1162 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1163 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1164 wps->error_indication); 1165 break; 1166 default: 1167 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1168 *attr.msg_type); 1169 return WPS_FAILURE; 1170 } 1171 1172 /* 1173 * Save a copy of the last message for Authenticator derivation if we 1174 * are continuing. However, skip M2D since it is not authenticated and 1175 * neither is the ACK/NACK response frame. This allows the possibly 1176 * following M2 to be processed correctly by using the previously sent 1177 * M1 in Authenticator derivation. 1178 */ 1179 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1180 /* Save a copy of the last message for Authenticator derivation 1181 */ 1182 wpabuf_free(wps->last_msg); 1183 wps->last_msg = wpabuf_dup(msg); 1184 } 1185 1186 return ret; 1187} 1188 1189 1190static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1191 const struct wpabuf *msg) 1192{ 1193 struct wps_parse_attr attr; 1194 1195 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1196 1197 if (wps_parse_msg(msg, &attr) < 0) 1198 return WPS_FAILURE; 1199 1200 if (attr.msg_type == NULL) { 1201 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1202 return WPS_FAILURE; 1203 } 1204 1205 if (*attr.msg_type != WPS_WSC_ACK) { 1206 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1207 *attr.msg_type); 1208 return WPS_FAILURE; 1209 } 1210 1211 if (attr.registrar_nonce == NULL || 1212 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1213 { 1214 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1215 return WPS_FAILURE; 1216 } 1217 1218 if (attr.enrollee_nonce == NULL || 1219 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1220 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1221 return WPS_FAILURE; 1222 } 1223 1224 if (wps->state == RECV_ACK && wps->wps->ap) { 1225 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1226 "completed successfully"); 1227 wps_success_event(wps->wps); 1228 wps->state = WPS_FINISHED; 1229 return WPS_DONE; 1230 } 1231 1232 return WPS_FAILURE; 1233} 1234 1235 1236static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1237 const struct wpabuf *msg) 1238{ 1239 struct wps_parse_attr attr; 1240 u16 config_error; 1241 1242 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1243 1244 if (wps_parse_msg(msg, &attr) < 0) 1245 return WPS_FAILURE; 1246 1247 if (attr.msg_type == NULL) { 1248 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1249 return WPS_FAILURE; 1250 } 1251 1252 if (*attr.msg_type != WPS_WSC_NACK) { 1253 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1254 *attr.msg_type); 1255 return WPS_FAILURE; 1256 } 1257 1258 if (attr.registrar_nonce == NULL || 1259 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1260 { 1261 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1262 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1263 attr.registrar_nonce, WPS_NONCE_LEN); 1264 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1265 wps->nonce_r, WPS_NONCE_LEN); 1266 return WPS_FAILURE; 1267 } 1268 1269 if (attr.enrollee_nonce == NULL || 1270 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1271 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1272 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1273 attr.enrollee_nonce, WPS_NONCE_LEN); 1274 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1275 wps->nonce_e, WPS_NONCE_LEN); 1276 return WPS_FAILURE; 1277 } 1278 1279 if (attr.config_error == NULL) { 1280 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1281 "in WSC_NACK"); 1282 return WPS_FAILURE; 1283 } 1284 1285 config_error = WPA_GET_BE16(attr.config_error); 1286 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1287 "Configuration Error %d", config_error); 1288 1289 switch (wps->state) { 1290 case RECV_M4: 1291 wps_fail_event(wps->wps, WPS_M3, config_error, 1292 wps->error_indication); 1293 break; 1294 case RECV_M6: 1295 wps_fail_event(wps->wps, WPS_M5, config_error, 1296 wps->error_indication); 1297 break; 1298 case RECV_M8: 1299 wps_fail_event(wps->wps, WPS_M7, config_error, 1300 wps->error_indication); 1301 break; 1302 default: 1303 break; 1304 } 1305 1306 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1307 * Enrollee is Authenticator */ 1308 wps->state = SEND_WSC_NACK; 1309 1310 return WPS_FAILURE; 1311} 1312 1313 1314enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1315 enum wsc_op_code op_code, 1316 const struct wpabuf *msg) 1317{ 1318 1319 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1320 "op_code=%d)", 1321 (unsigned long) wpabuf_len(msg), op_code); 1322 1323 if (op_code == WSC_UPnP) { 1324 /* Determine the OpCode based on message type attribute */ 1325 struct wps_parse_attr attr; 1326 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1327 if (*attr.msg_type == WPS_WSC_ACK) 1328 op_code = WSC_ACK; 1329 else if (*attr.msg_type == WPS_WSC_NACK) 1330 op_code = WSC_NACK; 1331 } 1332 } 1333 1334 switch (op_code) { 1335 case WSC_MSG: 1336 case WSC_UPnP: 1337 return wps_process_wsc_msg(wps, msg); 1338 case WSC_ACK: 1339 if (wps_validate_wsc_ack(msg) < 0) 1340 return WPS_FAILURE; 1341 return wps_process_wsc_ack(wps, msg); 1342 case WSC_NACK: 1343 if (wps_validate_wsc_nack(msg) < 0) 1344 return WPS_FAILURE; 1345 return wps_process_wsc_nack(wps, msg); 1346 default: 1347 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1348 return WPS_FAILURE; 1349 } 1350} 1351