wps_enrollee.c revision 5605286c30e1701491bd3af974ae423727750edd
1/* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#include "includes.h" 10 11#include "common.h" 12#include "crypto/crypto.h" 13#include "crypto/sha256.h" 14#include "crypto/random.h" 15#include "wps_i.h" 16#include "wps_dev_attr.h" 17 18 19static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 20{ 21 u8 state; 22 if (wps->wps->ap) 23 state = wps->wps->wps_state; 24 else 25 state = WPS_STATE_NOT_CONFIGURED; 26 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 27 state); 28 wpabuf_put_be16(msg, ATTR_WPS_STATE); 29 wpabuf_put_be16(msg, 1); 30 wpabuf_put_u8(msg, state); 31 return 0; 32} 33 34 35static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 36{ 37 u8 *hash; 38 const u8 *addr[4]; 39 size_t len[4]; 40 41 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 42 return -1; 43 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 44 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 45 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 46 47 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 48 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 49 "E-Hash derivation"); 50 return -1; 51 } 52 53 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 54 wpabuf_put_be16(msg, ATTR_E_HASH1); 55 wpabuf_put_be16(msg, SHA256_MAC_LEN); 56 hash = wpabuf_put(msg, SHA256_MAC_LEN); 57 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 58 addr[0] = wps->snonce; 59 len[0] = WPS_SECRET_NONCE_LEN; 60 addr[1] = wps->psk1; 61 len[1] = WPS_PSK_LEN; 62 addr[2] = wpabuf_head(wps->dh_pubkey_e); 63 len[2] = wpabuf_len(wps->dh_pubkey_e); 64 addr[3] = wpabuf_head(wps->dh_pubkey_r); 65 len[3] = wpabuf_len(wps->dh_pubkey_r); 66 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 67 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 70 wpabuf_put_be16(msg, ATTR_E_HASH2); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 74 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 75 addr[1] = wps->psk2; 76 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 78 79 return 0; 80} 81 82 83static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 84{ 85 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 86 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 87 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 88 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 89 return 0; 90} 91 92 93static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 94{ 95 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 96 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 97 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 99 WPS_SECRET_NONCE_LEN); 100 return 0; 101} 102 103 104static struct wpabuf * wps_build_m1(struct wps_data *wps) 105{ 106 struct wpabuf *msg; 107 u16 config_methods; 108 109 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 110 return NULL; 111 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 112 wps->nonce_e, WPS_NONCE_LEN); 113 114 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 115 msg = wpabuf_alloc(1000); 116 if (msg == NULL) 117 return NULL; 118 119 config_methods = wps->wps->config_methods; 120 if (wps->wps->ap && !wps->pbc_in_m1 && 121 (wps->dev_password_len != 0 || 122 (config_methods & WPS_CONFIG_DISPLAY))) { 123 /* 124 * These are the methods that the AP supports as an Enrollee 125 * for adding external Registrars, so remove PushButton. 126 * 127 * As a workaround for Windows 7 mechanism for probing WPS 128 * capabilities from M1, leave PushButton option if no PIN 129 * method is available or if WPS configuration enables PBC 130 * workaround. 131 */ 132 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 133#ifdef CONFIG_WPS2 134 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 135 WPS_CONFIG_PHY_PUSHBUTTON); 136#endif /* CONFIG_WPS2 */ 137 } 138 139 if (wps_build_version(msg) || 140 wps_build_msg_type(msg, WPS_M1) || 141 wps_build_uuid_e(msg, wps->uuid_e) || 142 wps_build_mac_addr(msg, wps->mac_addr_e) || 143 wps_build_enrollee_nonce(wps, msg) || 144 wps_build_public_key(wps, msg) || 145 wps_build_auth_type_flags(wps, msg) || 146 wps_build_encr_type_flags(wps, msg) || 147 wps_build_conn_type_flags(wps, msg) || 148 wps_build_config_methods(msg, config_methods) || 149 wps_build_wps_state(wps, msg) || 150 wps_build_device_attrs(&wps->wps->dev, msg) || 151 wps_build_rf_bands(&wps->wps->dev, msg, 152 wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 153 wps_build_assoc_state(wps, msg) || 154 wps_build_dev_password_id(msg, wps->dev_pw_id) || 155 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 156 wps_build_os_version(&wps->wps->dev, msg) || 157 wps_build_wfa_ext(msg, 0, NULL, 0) || 158 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 159 wpabuf_free(msg); 160 return NULL; 161 } 162 163 wps->state = RECV_M2; 164 return msg; 165} 166 167 168static struct wpabuf * wps_build_m3(struct wps_data *wps) 169{ 170 struct wpabuf *msg; 171 172 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 173 174 if (wps->dev_password == NULL) { 175 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 176 return NULL; 177 } 178 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 179 180 msg = wpabuf_alloc(1000); 181 if (msg == NULL) 182 return NULL; 183 184 if (wps_build_version(msg) || 185 wps_build_msg_type(msg, WPS_M3) || 186 wps_build_registrar_nonce(wps, msg) || 187 wps_build_e_hash(wps, msg) || 188 wps_build_wfa_ext(msg, 0, NULL, 0) || 189 wps_build_authenticator(wps, msg)) { 190 wpabuf_free(msg); 191 return NULL; 192 } 193 194 wps->state = RECV_M4; 195 return msg; 196} 197 198 199static struct wpabuf * wps_build_m5(struct wps_data *wps) 200{ 201 struct wpabuf *msg, *plain; 202 203 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 204 205 plain = wpabuf_alloc(200); 206 if (plain == NULL) 207 return NULL; 208 209 msg = wpabuf_alloc(1000); 210 if (msg == NULL) { 211 wpabuf_free(plain); 212 return NULL; 213 } 214 215 if (wps_build_version(msg) || 216 wps_build_msg_type(msg, WPS_M5) || 217 wps_build_registrar_nonce(wps, msg) || 218 wps_build_e_snonce1(wps, plain) || 219 wps_build_key_wrap_auth(wps, plain) || 220 wps_build_encr_settings(wps, msg, plain) || 221 wps_build_wfa_ext(msg, 0, NULL, 0) || 222 wps_build_authenticator(wps, msg)) { 223 wpabuf_free(plain); 224 wpabuf_free(msg); 225 return NULL; 226 } 227 wpabuf_free(plain); 228 229 wps->state = RECV_M6; 230 return msg; 231} 232 233 234static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 235{ 236 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 237 wpabuf_put_be16(msg, ATTR_SSID); 238 wpabuf_put_be16(msg, wps->wps->ssid_len); 239 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 240 return 0; 241} 242 243 244static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 245{ 246 u16 auth_type = wps->wps->auth_types; 247 248 /* Select the best authentication type */ 249 if (auth_type & WPS_AUTH_WPA2PSK) 250 auth_type = WPS_AUTH_WPA2PSK; 251 else if (auth_type & WPS_AUTH_WPAPSK) 252 auth_type = WPS_AUTH_WPAPSK; 253 else if (auth_type & WPS_AUTH_OPEN) 254 auth_type = WPS_AUTH_OPEN; 255 else if (auth_type & WPS_AUTH_SHARED) 256 auth_type = WPS_AUTH_SHARED; 257 258 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 259 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 260 wpabuf_put_be16(msg, 2); 261 wpabuf_put_be16(msg, auth_type); 262 return 0; 263} 264 265 266static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 267{ 268 u16 encr_type = wps->wps->encr_types; 269 270 /* Select the best encryption type */ 271 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 272 if (encr_type & WPS_ENCR_AES) 273 encr_type = WPS_ENCR_AES; 274 else if (encr_type & WPS_ENCR_TKIP) 275 encr_type = WPS_ENCR_TKIP; 276 } else { 277 if (encr_type & WPS_ENCR_WEP) 278 encr_type = WPS_ENCR_WEP; 279 else if (encr_type & WPS_ENCR_NONE) 280 encr_type = WPS_ENCR_NONE; 281 } 282 283 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 284 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 285 wpabuf_put_be16(msg, 2); 286 wpabuf_put_be16(msg, encr_type); 287 return 0; 288} 289 290 291static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 292{ 293 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 294 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 295 wpabuf_put_be16(msg, wps->wps->network_key_len); 296 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 297 return 0; 298} 299 300 301static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 302{ 303 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 304 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 305 wpabuf_put_be16(msg, ETH_ALEN); 306 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 307 return 0; 308} 309 310 311static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 312{ 313 if (wps->wps->ap_settings) { 314 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 315 wpabuf_put_data(plain, wps->wps->ap_settings, 316 wps->wps->ap_settings_len); 317 return 0; 318 } 319 320 return wps_build_cred_ssid(wps, plain) || 321 wps_build_cred_mac_addr(wps, plain) || 322 wps_build_cred_auth_type(wps, plain) || 323 wps_build_cred_encr_type(wps, plain) || 324 wps_build_cred_network_key(wps, plain); 325} 326 327 328static struct wpabuf * wps_build_m7(struct wps_data *wps) 329{ 330 struct wpabuf *msg, *plain; 331 332 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 333 334 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 335 if (plain == NULL) 336 return NULL; 337 338 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 339 if (msg == NULL) { 340 wpabuf_free(plain); 341 return NULL; 342 } 343 344 if (wps_build_version(msg) || 345 wps_build_msg_type(msg, WPS_M7) || 346 wps_build_registrar_nonce(wps, msg) || 347 wps_build_e_snonce2(wps, plain) || 348 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 349 wps_build_key_wrap_auth(wps, plain) || 350 wps_build_encr_settings(wps, msg, plain) || 351 wps_build_wfa_ext(msg, 0, NULL, 0) || 352 wps_build_authenticator(wps, msg)) { 353 wpabuf_free(plain); 354 wpabuf_free(msg); 355 return NULL; 356 } 357 wpabuf_free(plain); 358 359 if (wps->wps->ap && wps->wps->registrar) { 360 /* 361 * If the Registrar is only learning our current configuration, 362 * it may not continue protocol run to successful completion. 363 * Store information here to make sure it remains available. 364 */ 365 wps_device_store(wps->wps->registrar, &wps->peer_dev, 366 wps->uuid_r); 367 } 368 369 wps->state = RECV_M8; 370 return msg; 371} 372 373 374static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 375{ 376 struct wpabuf *msg; 377 378 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 379 380 msg = wpabuf_alloc(1000); 381 if (msg == NULL) 382 return NULL; 383 384 if (wps_build_version(msg) || 385 wps_build_msg_type(msg, WPS_WSC_DONE) || 386 wps_build_enrollee_nonce(wps, msg) || 387 wps_build_registrar_nonce(wps, msg) || 388 wps_build_wfa_ext(msg, 0, NULL, 0)) { 389 wpabuf_free(msg); 390 return NULL; 391 } 392 393 if (wps->wps->ap) 394 wps->state = RECV_ACK; 395 else { 396 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 397 wps->state = WPS_FINISHED; 398 } 399 return msg; 400} 401 402 403struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 404 enum wsc_op_code *op_code) 405{ 406 struct wpabuf *msg; 407 408 switch (wps->state) { 409 case SEND_M1: 410 msg = wps_build_m1(wps); 411 *op_code = WSC_MSG; 412 break; 413 case SEND_M3: 414 msg = wps_build_m3(wps); 415 *op_code = WSC_MSG; 416 break; 417 case SEND_M5: 418 msg = wps_build_m5(wps); 419 *op_code = WSC_MSG; 420 break; 421 case SEND_M7: 422 msg = wps_build_m7(wps); 423 *op_code = WSC_MSG; 424 break; 425 case RECEIVED_M2D: 426 if (wps->wps->ap) { 427 msg = wps_build_wsc_nack(wps); 428 *op_code = WSC_NACK; 429 break; 430 } 431 msg = wps_build_wsc_ack(wps); 432 *op_code = WSC_ACK; 433 if (msg) { 434 /* Another M2/M2D may be received */ 435 wps->state = RECV_M2; 436 } 437 break; 438 case SEND_WSC_NACK: 439 msg = wps_build_wsc_nack(wps); 440 *op_code = WSC_NACK; 441 break; 442 case WPS_MSG_DONE: 443 msg = wps_build_wsc_done(wps); 444 *op_code = WSC_Done; 445 break; 446 default: 447 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 448 "a message", wps->state); 449 msg = NULL; 450 break; 451 } 452 453 if (*op_code == WSC_MSG && msg) { 454 /* Save a copy of the last message for Authenticator derivation 455 */ 456 wpabuf_free(wps->last_msg); 457 wps->last_msg = wpabuf_dup(msg); 458 } 459 460 return msg; 461} 462 463 464static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 465{ 466 if (r_nonce == NULL) { 467 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 468 return -1; 469 } 470 471 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 472 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 473 wps->nonce_r, WPS_NONCE_LEN); 474 475 return 0; 476} 477 478 479static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 480{ 481 if (e_nonce == NULL) { 482 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 483 return -1; 484 } 485 486 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 487 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 488 return -1; 489 } 490 491 return 0; 492} 493 494 495static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 496{ 497 if (uuid_r == NULL) { 498 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 499 return -1; 500 } 501 502 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 503 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 504 505 return 0; 506} 507 508 509static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 510 size_t pk_len) 511{ 512 if (pk == NULL || pk_len == 0) { 513 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 514 return -1; 515 } 516 517 wpabuf_free(wps->dh_pubkey_r); 518 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 519 if (wps->dh_pubkey_r == NULL) 520 return -1; 521 522 if (wps_derive_keys(wps) < 0) 523 return -1; 524 525 return 0; 526} 527 528 529static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 530{ 531 if (r_hash1 == NULL) { 532 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 533 return -1; 534 } 535 536 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 537 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 538 539 return 0; 540} 541 542 543static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 544{ 545 if (r_hash2 == NULL) { 546 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 547 return -1; 548 } 549 550 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 551 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 552 553 return 0; 554} 555 556 557static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 558{ 559 u8 hash[SHA256_MAC_LEN]; 560 const u8 *addr[4]; 561 size_t len[4]; 562 563 if (r_snonce1 == NULL) { 564 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 565 return -1; 566 } 567 568 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 569 WPS_SECRET_NONCE_LEN); 570 571 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 572 addr[0] = r_snonce1; 573 len[0] = WPS_SECRET_NONCE_LEN; 574 addr[1] = wps->psk1; 575 len[1] = WPS_PSK_LEN; 576 addr[2] = wpabuf_head(wps->dh_pubkey_e); 577 len[2] = wpabuf_len(wps->dh_pubkey_e); 578 addr[3] = wpabuf_head(wps->dh_pubkey_r); 579 len[3] = wpabuf_len(wps->dh_pubkey_r); 580 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 581 582 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 583 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 584 "not match with the pre-committed value"); 585 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 586 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 587 return -1; 588 } 589 590 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 591 "half of the device password"); 592 593 return 0; 594} 595 596 597static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 598{ 599 u8 hash[SHA256_MAC_LEN]; 600 const u8 *addr[4]; 601 size_t len[4]; 602 603 if (r_snonce2 == NULL) { 604 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 605 return -1; 606 } 607 608 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 609 WPS_SECRET_NONCE_LEN); 610 611 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 612 addr[0] = r_snonce2; 613 len[0] = WPS_SECRET_NONCE_LEN; 614 addr[1] = wps->psk2; 615 len[1] = WPS_PSK_LEN; 616 addr[2] = wpabuf_head(wps->dh_pubkey_e); 617 len[2] = wpabuf_len(wps->dh_pubkey_e); 618 addr[3] = wpabuf_head(wps->dh_pubkey_r); 619 len[3] = wpabuf_len(wps->dh_pubkey_r); 620 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 621 622 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 623 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 624 "not match with the pre-committed value"); 625 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 626 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 627 return -1; 628 } 629 630 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 631 "half of the device password"); 632 633 return 0; 634} 635 636 637static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 638 size_t cred_len, int wps2) 639{ 640 struct wps_parse_attr attr; 641 struct wpabuf msg; 642 int ret = 0; 643 644 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 645 os_memset(&wps->cred, 0, sizeof(wps->cred)); 646 wpabuf_set(&msg, cred, cred_len); 647 if (wps_parse_msg(&msg, &attr) < 0 || 648 wps_process_cred(&attr, &wps->cred)) 649 return -1; 650 651 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 652 0) { 653 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 654 MACSTR ") does not match with own address (" MACSTR 655 ")", MAC2STR(wps->cred.mac_addr), 656 MAC2STR(wps->wps->dev.mac_addr)); 657 /* 658 * In theory, this could be consider fatal error, but there are 659 * number of deployed implementations using other address here 660 * due to unclarity in the specification. For interoperability 661 * reasons, allow this to be processed since we do not really 662 * use the MAC Address information for anything. 663 */ 664#ifdef CONFIG_WPS_STRICT 665 if (wps2) { 666 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 667 "MAC Address in AP Settings"); 668 return -1; 669 } 670#endif /* CONFIG_WPS_STRICT */ 671 } 672 673#ifdef CONFIG_WPS2 674 if (!(wps->cred.encr_type & 675 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 676 if (wps->cred.encr_type & WPS_ENCR_WEP) { 677 wpa_printf(MSG_INFO, "WPS: Reject Credential " 678 "due to WEP configuration"); 679 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 680 return -2; 681 } 682 683 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 684 "invalid encr_type 0x%x", wps->cred.encr_type); 685 return -1; 686 } 687#endif /* CONFIG_WPS2 */ 688 689 if (wps->wps->cred_cb) { 690 wps->cred.cred_attr = cred - 4; 691 wps->cred.cred_attr_len = cred_len + 4; 692 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 693 wps->cred.cred_attr = NULL; 694 wps->cred.cred_attr_len = 0; 695 } 696 697 return ret; 698} 699 700 701static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 702 size_t cred_len[], size_t num_cred, int wps2) 703{ 704 size_t i; 705 int ok = 0; 706 707 if (wps->wps->ap) 708 return 0; 709 710 if (num_cred == 0) { 711 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 712 "received"); 713 return -1; 714 } 715 716 for (i = 0; i < num_cred; i++) { 717 int res; 718 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 719 if (res == 0) 720 ok++; 721 else if (res == -2) 722 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 723 else 724 return -1; 725 } 726 727 if (ok == 0) { 728 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 729 "received"); 730 return -1; 731 } 732 733 return 0; 734} 735 736 737static int wps_process_ap_settings_e(struct wps_data *wps, 738 struct wps_parse_attr *attr, 739 struct wpabuf *attrs, int wps2) 740{ 741 struct wps_credential cred; 742 743 if (!wps->wps->ap) 744 return 0; 745 746 if (wps_process_ap_settings(attr, &cred) < 0) 747 return -1; 748 749 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 750 "Registrar"); 751 752 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 753 0) { 754 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 755 MACSTR ") does not match with own address (" MACSTR 756 ")", MAC2STR(cred.mac_addr), 757 MAC2STR(wps->wps->dev.mac_addr)); 758 /* 759 * In theory, this could be consider fatal error, but there are 760 * number of deployed implementations using other address here 761 * due to unclarity in the specification. For interoperability 762 * reasons, allow this to be processed since we do not really 763 * use the MAC Address information for anything. 764 */ 765#ifdef CONFIG_WPS_STRICT 766 if (wps2) { 767 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 768 "MAC Address in AP Settings"); 769 return -1; 770 } 771#endif /* CONFIG_WPS_STRICT */ 772 } 773 774#ifdef CONFIG_WPS2 775 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 776 { 777 if (cred.encr_type & WPS_ENCR_WEP) { 778 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 779 "due to WEP configuration"); 780 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 781 return -1; 782 } 783 784 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 785 "invalid encr_type 0x%x", cred.encr_type); 786 return -1; 787 } 788#endif /* CONFIG_WPS2 */ 789 790#ifdef CONFIG_WPS_STRICT 791 if (wps2) { 792 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 793 WPS_ENCR_TKIP || 794 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 795 WPS_AUTH_WPAPSK) { 796 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 797 "AP Settings: WPA-Personal/TKIP only"); 798 wps->error_indication = 799 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 800 return -1; 801 } 802 } 803#endif /* CONFIG_WPS_STRICT */ 804 805#ifdef CONFIG_WPS2 806 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 807 { 808 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 809 "TKIP+AES"); 810 cred.encr_type |= WPS_ENCR_AES; 811 } 812 813 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 814 WPS_AUTH_WPAPSK) { 815 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 816 "WPAPSK+WPA2PSK"); 817 cred.auth_type |= WPS_AUTH_WPA2PSK; 818 } 819#endif /* CONFIG_WPS2 */ 820 821 if (wps->wps->cred_cb) { 822 cred.cred_attr = wpabuf_head(attrs); 823 cred.cred_attr_len = wpabuf_len(attrs); 824 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 825 } 826 827 return 0; 828} 829 830 831static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 832{ 833 u16 id; 834 835 if (dev_pw_id == NULL) { 836 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 837 return -1; 838 } 839 840 id = WPA_GET_BE16(dev_pw_id); 841 if (wps->dev_pw_id == id) { 842 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 843 return 0; 844 } 845 846#ifdef CONFIG_P2P 847 if ((id == DEV_PW_DEFAULT && 848 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 849 (id == DEV_PW_REGISTRAR_SPECIFIED && 850 wps->dev_pw_id == DEV_PW_DEFAULT)) { 851 /* 852 * Common P2P use cases indicate whether the PIN is from the 853 * client or GO using Device Password Id in M1/M2 in a way that 854 * does not look fully compliant with WSC specification. Anyway, 855 * this is deployed and needs to be allowed, so ignore changes 856 * between Registrar-Specified and Default PIN. 857 */ 858 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 859 "change"); 860 return 0; 861 } 862#endif /* CONFIG_P2P */ 863 864 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 865 "ID from %u to %u", wps->dev_pw_id, id); 866 867 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 868 wpa_printf(MSG_DEBUG, 869 "WPS: Workaround - ignore PBC-to-PIN change"); 870 return 0; 871 } 872 873 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 874 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 875 os_free(wps->dev_password); 876 wps->dev_pw_id = wps->alt_dev_pw_id; 877 wps->dev_password = wps->alt_dev_password; 878 wps->dev_password_len = wps->alt_dev_password_len; 879 wps->alt_dev_password = NULL; 880 wps->alt_dev_password_len = 0; 881 return 0; 882 } 883 884 return -1; 885} 886 887 888static enum wps_process_res wps_process_m2(struct wps_data *wps, 889 const struct wpabuf *msg, 890 struct wps_parse_attr *attr) 891{ 892 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 893 894 if (wps->state != RECV_M2) { 895 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 896 "receiving M2", wps->state); 897 wps->state = SEND_WSC_NACK; 898 return WPS_CONTINUE; 899 } 900 901 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 902 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 903 wps_process_uuid_r(wps, attr->uuid_r) || 904 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 905 wps->state = SEND_WSC_NACK; 906 return WPS_CONTINUE; 907 } 908 909 /* 910 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 911 * special locked mode is used to allow protocol run up to M7 in order 912 * to support external Registrars that only learn the current AP 913 * configuration without changing it. 914 */ 915 if (wps->wps->ap && 916 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 917 wps->dev_password == NULL)) { 918 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 919 "registration of a new Registrar"); 920 wps->config_error = WPS_CFG_SETUP_LOCKED; 921 wps->state = SEND_WSC_NACK; 922 return WPS_CONTINUE; 923 } 924 925 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 926 wps_process_authenticator(wps, attr->authenticator, msg) || 927 wps_process_device_attrs(&wps->peer_dev, attr)) { 928 wps->state = SEND_WSC_NACK; 929 return WPS_CONTINUE; 930 } 931 932 wps->state = SEND_M3; 933 return WPS_CONTINUE; 934} 935 936 937static enum wps_process_res wps_process_m2d(struct wps_data *wps, 938 struct wps_parse_attr *attr) 939{ 940 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 941 942 if (wps->state != RECV_M2) { 943 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 944 "receiving M2D", wps->state); 945 wps->state = SEND_WSC_NACK; 946 return WPS_CONTINUE; 947 } 948 949 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 950 attr->manufacturer, attr->manufacturer_len); 951 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 952 attr->model_name, attr->model_name_len); 953 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 954 attr->model_number, attr->model_number_len); 955 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 956 attr->serial_number, attr->serial_number_len); 957 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 958 attr->dev_name, attr->dev_name_len); 959 960 if (wps->wps->event_cb) { 961 union wps_event_data data; 962 struct wps_event_m2d *m2d = &data.m2d; 963 os_memset(&data, 0, sizeof(data)); 964 if (attr->config_methods) 965 m2d->config_methods = 966 WPA_GET_BE16(attr->config_methods); 967 m2d->manufacturer = attr->manufacturer; 968 m2d->manufacturer_len = attr->manufacturer_len; 969 m2d->model_name = attr->model_name; 970 m2d->model_name_len = attr->model_name_len; 971 m2d->model_number = attr->model_number; 972 m2d->model_number_len = attr->model_number_len; 973 m2d->serial_number = attr->serial_number; 974 m2d->serial_number_len = attr->serial_number_len; 975 m2d->dev_name = attr->dev_name; 976 m2d->dev_name_len = attr->dev_name_len; 977 m2d->primary_dev_type = attr->primary_dev_type; 978 if (attr->config_error) 979 m2d->config_error = 980 WPA_GET_BE16(attr->config_error); 981 if (attr->dev_password_id) 982 m2d->dev_password_id = 983 WPA_GET_BE16(attr->dev_password_id); 984 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 985 } 986 987 wps->state = RECEIVED_M2D; 988 return WPS_CONTINUE; 989} 990 991 992static enum wps_process_res wps_process_m4(struct wps_data *wps, 993 const struct wpabuf *msg, 994 struct wps_parse_attr *attr) 995{ 996 struct wpabuf *decrypted; 997 struct wps_parse_attr eattr; 998 999 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1000 1001 if (wps->state != RECV_M4) { 1002 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1003 "receiving M4", wps->state); 1004 wps->state = SEND_WSC_NACK; 1005 return WPS_CONTINUE; 1006 } 1007 1008 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1009 wps_process_authenticator(wps, attr->authenticator, msg) || 1010 wps_process_r_hash1(wps, attr->r_hash1) || 1011 wps_process_r_hash2(wps, attr->r_hash2)) { 1012 wps->state = SEND_WSC_NACK; 1013 return WPS_CONTINUE; 1014 } 1015 1016 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1017 attr->encr_settings_len); 1018 if (decrypted == NULL) { 1019 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1020 "Settings attribute"); 1021 wps->state = SEND_WSC_NACK; 1022 return WPS_CONTINUE; 1023 } 1024 1025 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1026 wpabuf_free(decrypted); 1027 wps->state = SEND_WSC_NACK; 1028 return WPS_CONTINUE; 1029 } 1030 1031 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1032 "attribute"); 1033 if (wps_parse_msg(decrypted, &eattr) < 0 || 1034 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1035 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1036 wpabuf_free(decrypted); 1037 wps->state = SEND_WSC_NACK; 1038 return WPS_CONTINUE; 1039 } 1040 wpabuf_free(decrypted); 1041 1042 wps->state = SEND_M5; 1043 return WPS_CONTINUE; 1044} 1045 1046 1047static enum wps_process_res wps_process_m6(struct wps_data *wps, 1048 const struct wpabuf *msg, 1049 struct wps_parse_attr *attr) 1050{ 1051 struct wpabuf *decrypted; 1052 struct wps_parse_attr eattr; 1053 1054 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1055 1056 if (wps->state != RECV_M6) { 1057 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1058 "receiving M6", wps->state); 1059 wps->state = SEND_WSC_NACK; 1060 return WPS_CONTINUE; 1061 } 1062 1063 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1064 wps_process_authenticator(wps, attr->authenticator, msg)) { 1065 wps->state = SEND_WSC_NACK; 1066 return WPS_CONTINUE; 1067 } 1068 1069 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1070 attr->encr_settings_len); 1071 if (decrypted == NULL) { 1072 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1073 "Settings attribute"); 1074 wps->state = SEND_WSC_NACK; 1075 return WPS_CONTINUE; 1076 } 1077 1078 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1079 wpabuf_free(decrypted); 1080 wps->state = SEND_WSC_NACK; 1081 return WPS_CONTINUE; 1082 } 1083 1084 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1085 "attribute"); 1086 if (wps_parse_msg(decrypted, &eattr) < 0 || 1087 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1088 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1089 wpabuf_free(decrypted); 1090 wps->state = SEND_WSC_NACK; 1091 return WPS_CONTINUE; 1092 } 1093 wpabuf_free(decrypted); 1094 1095 if (wps->wps->ap) 1096 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1097 NULL); 1098 1099 wps->state = SEND_M7; 1100 return WPS_CONTINUE; 1101} 1102 1103 1104static enum wps_process_res wps_process_m8(struct wps_data *wps, 1105 const struct wpabuf *msg, 1106 struct wps_parse_attr *attr) 1107{ 1108 struct wpabuf *decrypted; 1109 struct wps_parse_attr eattr; 1110 1111 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1112 1113 if (wps->state != RECV_M8) { 1114 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1115 "receiving M8", wps->state); 1116 wps->state = SEND_WSC_NACK; 1117 return WPS_CONTINUE; 1118 } 1119 1120 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1121 wps_process_authenticator(wps, attr->authenticator, msg)) { 1122 wps->state = SEND_WSC_NACK; 1123 return WPS_CONTINUE; 1124 } 1125 1126 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1127 /* 1128 * Stop here if special ap_setup_locked == 2 mode allowed the 1129 * protocol to continue beyond M2. This allows ER to learn the 1130 * current AP settings without changing them. 1131 */ 1132 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1133 "registration of a new Registrar"); 1134 wps->config_error = WPS_CFG_SETUP_LOCKED; 1135 wps->state = SEND_WSC_NACK; 1136 return WPS_CONTINUE; 1137 } 1138 1139 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1140 attr->encr_settings_len); 1141 if (decrypted == NULL) { 1142 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1143 "Settings attribute"); 1144 wps->state = SEND_WSC_NACK; 1145 return WPS_CONTINUE; 1146 } 1147 1148 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1149 attr->version2 != NULL) < 0) { 1150 wpabuf_free(decrypted); 1151 wps->state = SEND_WSC_NACK; 1152 return WPS_CONTINUE; 1153 } 1154 1155 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1156 "attribute"); 1157 if (wps_parse_msg(decrypted, &eattr) < 0 || 1158 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1159 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1160 eattr.num_cred, attr->version2 != NULL) || 1161 wps_process_ap_settings_e(wps, &eattr, decrypted, 1162 attr->version2 != NULL)) { 1163 wpabuf_free(decrypted); 1164 wps->state = SEND_WSC_NACK; 1165 return WPS_CONTINUE; 1166 } 1167 wpabuf_free(decrypted); 1168 1169 wps->state = WPS_MSG_DONE; 1170 return WPS_CONTINUE; 1171} 1172 1173 1174static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1175 const struct wpabuf *msg) 1176{ 1177 struct wps_parse_attr attr; 1178 enum wps_process_res ret = WPS_CONTINUE; 1179 1180 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1181 1182 if (wps_parse_msg(msg, &attr) < 0) 1183 return WPS_FAILURE; 1184 1185 if (attr.enrollee_nonce == NULL || 1186 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1187 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1188 return WPS_FAILURE; 1189 } 1190 1191 if (attr.msg_type == NULL) { 1192 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1193 wps->state = SEND_WSC_NACK; 1194 return WPS_CONTINUE; 1195 } 1196 1197 switch (*attr.msg_type) { 1198 case WPS_M2: 1199 if (wps_validate_m2(msg) < 0) 1200 return WPS_FAILURE; 1201 ret = wps_process_m2(wps, msg, &attr); 1202 break; 1203 case WPS_M2D: 1204 if (wps_validate_m2d(msg) < 0) 1205 return WPS_FAILURE; 1206 ret = wps_process_m2d(wps, &attr); 1207 break; 1208 case WPS_M4: 1209 if (wps_validate_m4(msg) < 0) 1210 return WPS_FAILURE; 1211 ret = wps_process_m4(wps, msg, &attr); 1212 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1213 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1214 wps->error_indication, 1215 wps->peer_dev.mac_addr); 1216 break; 1217 case WPS_M6: 1218 if (wps_validate_m6(msg) < 0) 1219 return WPS_FAILURE; 1220 ret = wps_process_m6(wps, msg, &attr); 1221 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1222 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1223 wps->error_indication, 1224 wps->peer_dev.mac_addr); 1225 break; 1226 case WPS_M8: 1227 if (wps_validate_m8(msg) < 0) 1228 return WPS_FAILURE; 1229 ret = wps_process_m8(wps, msg, &attr); 1230 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1231 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1232 wps->error_indication, 1233 wps->peer_dev.mac_addr); 1234 break; 1235 default: 1236 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1237 *attr.msg_type); 1238 return WPS_FAILURE; 1239 } 1240 1241 /* 1242 * Save a copy of the last message for Authenticator derivation if we 1243 * are continuing. However, skip M2D since it is not authenticated and 1244 * neither is the ACK/NACK response frame. This allows the possibly 1245 * following M2 to be processed correctly by using the previously sent 1246 * M1 in Authenticator derivation. 1247 */ 1248 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1249 /* Save a copy of the last message for Authenticator derivation 1250 */ 1251 wpabuf_free(wps->last_msg); 1252 wps->last_msg = wpabuf_dup(msg); 1253 } 1254 1255 return ret; 1256} 1257 1258 1259static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1260 const struct wpabuf *msg) 1261{ 1262 struct wps_parse_attr attr; 1263 1264 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1265 1266 if (wps_parse_msg(msg, &attr) < 0) 1267 return WPS_FAILURE; 1268 1269 if (attr.msg_type == NULL) { 1270 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1271 return WPS_FAILURE; 1272 } 1273 1274 if (*attr.msg_type != WPS_WSC_ACK) { 1275 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1276 *attr.msg_type); 1277 return WPS_FAILURE; 1278 } 1279 1280 if (attr.registrar_nonce == NULL || 1281 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1282 { 1283 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1284 return WPS_FAILURE; 1285 } 1286 1287 if (attr.enrollee_nonce == NULL || 1288 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1289 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1290 return WPS_FAILURE; 1291 } 1292 1293 if (wps->state == RECV_ACK && wps->wps->ap) { 1294 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1295 "completed successfully"); 1296 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1297 wps->state = WPS_FINISHED; 1298 return WPS_DONE; 1299 } 1300 1301 return WPS_FAILURE; 1302} 1303 1304 1305static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1306 const struct wpabuf *msg) 1307{ 1308 struct wps_parse_attr attr; 1309 u16 config_error; 1310 1311 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1312 1313 if (wps_parse_msg(msg, &attr) < 0) 1314 return WPS_FAILURE; 1315 1316 if (attr.msg_type == NULL) { 1317 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1318 return WPS_FAILURE; 1319 } 1320 1321 if (*attr.msg_type != WPS_WSC_NACK) { 1322 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1323 *attr.msg_type); 1324 return WPS_FAILURE; 1325 } 1326 1327 if (attr.registrar_nonce == NULL || 1328 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1329 { 1330 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1331 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1332 attr.registrar_nonce, WPS_NONCE_LEN); 1333 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1334 wps->nonce_r, WPS_NONCE_LEN); 1335 return WPS_FAILURE; 1336 } 1337 1338 if (attr.enrollee_nonce == NULL || 1339 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1340 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1341 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1342 attr.enrollee_nonce, WPS_NONCE_LEN); 1343 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1344 wps->nonce_e, WPS_NONCE_LEN); 1345 return WPS_FAILURE; 1346 } 1347 1348 if (attr.config_error == NULL) { 1349 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1350 "in WSC_NACK"); 1351 return WPS_FAILURE; 1352 } 1353 1354 config_error = WPA_GET_BE16(attr.config_error); 1355 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1356 "Configuration Error %d", config_error); 1357 1358 switch (wps->state) { 1359 case RECV_M4: 1360 wps_fail_event(wps->wps, WPS_M3, config_error, 1361 wps->error_indication, wps->peer_dev.mac_addr); 1362 break; 1363 case RECV_M6: 1364 wps_fail_event(wps->wps, WPS_M5, config_error, 1365 wps->error_indication, wps->peer_dev.mac_addr); 1366 break; 1367 case RECV_M8: 1368 wps_fail_event(wps->wps, WPS_M7, config_error, 1369 wps->error_indication, wps->peer_dev.mac_addr); 1370 break; 1371 default: 1372 break; 1373 } 1374 1375 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1376 * Enrollee is Authenticator */ 1377 wps->state = SEND_WSC_NACK; 1378 1379 return WPS_FAILURE; 1380} 1381 1382 1383enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1384 enum wsc_op_code op_code, 1385 const struct wpabuf *msg) 1386{ 1387 1388 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1389 "op_code=%d)", 1390 (unsigned long) wpabuf_len(msg), op_code); 1391 1392 if (op_code == WSC_UPnP) { 1393 /* Determine the OpCode based on message type attribute */ 1394 struct wps_parse_attr attr; 1395 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1396 if (*attr.msg_type == WPS_WSC_ACK) 1397 op_code = WSC_ACK; 1398 else if (*attr.msg_type == WPS_WSC_NACK) 1399 op_code = WSC_NACK; 1400 } 1401 } 1402 1403 switch (op_code) { 1404 case WSC_MSG: 1405 case WSC_UPnP: 1406 return wps_process_wsc_msg(wps, msg); 1407 case WSC_ACK: 1408 if (wps_validate_wsc_ack(msg) < 0) 1409 return WPS_FAILURE; 1410 return wps_process_wsc_ack(wps, msg); 1411 case WSC_NACK: 1412 if (wps_validate_wsc_nack(msg) < 0) 1413 return WPS_FAILURE; 1414 return wps_process_wsc_nack(wps, msg); 1415 default: 1416 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1417 return WPS_FAILURE; 1418 } 1419} 1420