wps_enrollee.c revision 15907098d1f67c24bb000e593e279af173cf57d7
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 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 134 WPS_CONFIG_PHY_PUSHBUTTON); 135 } 136 137 if (wps_build_version(msg) || 138 wps_build_msg_type(msg, WPS_M1) || 139 wps_build_uuid_e(msg, wps->uuid_e) || 140 wps_build_mac_addr(msg, wps->mac_addr_e) || 141 wps_build_enrollee_nonce(wps, msg) || 142 wps_build_public_key(wps, msg) || 143 wps_build_auth_type_flags(wps, msg) || 144 wps_build_encr_type_flags(wps, msg) || 145 wps_build_conn_type_flags(wps, msg) || 146 wps_build_config_methods(msg, config_methods) || 147 wps_build_wps_state(wps, msg) || 148 wps_build_device_attrs(&wps->wps->dev, msg) || 149 wps_build_rf_bands(&wps->wps->dev, msg, 150 wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 151 wps_build_assoc_state(wps, msg) || 152 wps_build_dev_password_id(msg, wps->dev_pw_id) || 153 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 154 wps_build_os_version(&wps->wps->dev, msg) || 155 wps_build_wfa_ext(msg, 0, NULL, 0) || 156 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 157 wpabuf_free(msg); 158 return NULL; 159 } 160 161 wps->state = RECV_M2; 162 return msg; 163} 164 165 166static struct wpabuf * wps_build_m3(struct wps_data *wps) 167{ 168 struct wpabuf *msg; 169 170 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 171 172 if (wps->dev_password == NULL) { 173 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 174 return NULL; 175 } 176 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 177 178 msg = wpabuf_alloc(1000); 179 if (msg == NULL) 180 return NULL; 181 182 if (wps_build_version(msg) || 183 wps_build_msg_type(msg, WPS_M3) || 184 wps_build_registrar_nonce(wps, msg) || 185 wps_build_e_hash(wps, msg) || 186 wps_build_wfa_ext(msg, 0, NULL, 0) || 187 wps_build_authenticator(wps, msg)) { 188 wpabuf_free(msg); 189 return NULL; 190 } 191 192 wps->state = RECV_M4; 193 return msg; 194} 195 196 197static struct wpabuf * wps_build_m5(struct wps_data *wps) 198{ 199 struct wpabuf *msg, *plain; 200 201 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 202 203 plain = wpabuf_alloc(200); 204 if (plain == NULL) 205 return NULL; 206 207 msg = wpabuf_alloc(1000); 208 if (msg == NULL) { 209 wpabuf_free(plain); 210 return NULL; 211 } 212 213 if (wps_build_version(msg) || 214 wps_build_msg_type(msg, WPS_M5) || 215 wps_build_registrar_nonce(wps, msg) || 216 wps_build_e_snonce1(wps, plain) || 217 wps_build_key_wrap_auth(wps, plain) || 218 wps_build_encr_settings(wps, msg, plain) || 219 wps_build_wfa_ext(msg, 0, NULL, 0) || 220 wps_build_authenticator(wps, msg)) { 221 wpabuf_free(plain); 222 wpabuf_free(msg); 223 return NULL; 224 } 225 wpabuf_free(plain); 226 227 wps->state = RECV_M6; 228 return msg; 229} 230 231 232static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 233{ 234 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 235 wpabuf_put_be16(msg, ATTR_SSID); 236 wpabuf_put_be16(msg, wps->wps->ssid_len); 237 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 238 return 0; 239} 240 241 242static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 243{ 244 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", 245 wps->wps->ap_auth_type); 246 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 247 wpabuf_put_be16(msg, 2); 248 wpabuf_put_be16(msg, wps->wps->ap_auth_type); 249 return 0; 250} 251 252 253static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 254{ 255 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", 256 wps->wps->ap_encr_type); 257 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 258 wpabuf_put_be16(msg, 2); 259 wpabuf_put_be16(msg, wps->wps->ap_encr_type); 260 return 0; 261} 262 263 264static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 265{ 266 if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 267 wps->wps->network_key_len == 0) { 268 char hex[65]; 269 u8 psk[32]; 270 /* Generate a random per-device PSK */ 271 if (random_get_bytes(psk, sizeof(psk)) < 0) 272 return -1; 273 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 274 psk, sizeof(psk)); 275 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 276 (unsigned int) wps->new_psk_len * 2); 277 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 278 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 279 wpabuf_put_be16(msg, sizeof(psk) * 2); 280 wpabuf_put_data(msg, hex, sizeof(psk) * 2); 281 if (wps->wps->registrar) { 282 wps_cb_new_psk(wps->wps->registrar, 283 wps->peer_dev.mac_addr, 284 wps->p2p_dev_addr, psk, sizeof(psk)); 285 } 286 return 0; 287 } 288 289 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 290 (unsigned int) wps->wps->network_key_len); 291 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 292 wpabuf_put_be16(msg, wps->wps->network_key_len); 293 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 294 return 0; 295} 296 297 298static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 299{ 300 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 301 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 302 wpabuf_put_be16(msg, ETH_ALEN); 303 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 304 return 0; 305} 306 307 308static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 309{ 310 const u8 *start, *end; 311 int ret; 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 wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 321 start = wpabuf_put(plain, 0); 322 ret = wps_build_cred_ssid(wps, plain) || 323 wps_build_cred_mac_addr(wps, plain) || 324 wps_build_cred_auth_type(wps, plain) || 325 wps_build_cred_encr_type(wps, plain) || 326 wps_build_cred_network_key(wps, plain); 327 end = wpabuf_put(plain, 0); 328 329 wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 330 start, end - start); 331 332 return ret; 333} 334 335 336static struct wpabuf * wps_build_m7(struct wps_data *wps) 337{ 338 struct wpabuf *msg, *plain; 339 340 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 341 342 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 343 if (plain == NULL) 344 return NULL; 345 346 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 347 if (msg == NULL) { 348 wpabuf_free(plain); 349 return NULL; 350 } 351 352 if (wps_build_version(msg) || 353 wps_build_msg_type(msg, WPS_M7) || 354 wps_build_registrar_nonce(wps, msg) || 355 wps_build_e_snonce2(wps, plain) || 356 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 357 wps_build_key_wrap_auth(wps, plain) || 358 wps_build_encr_settings(wps, msg, plain) || 359 wps_build_wfa_ext(msg, 0, NULL, 0) || 360 wps_build_authenticator(wps, msg)) { 361 wpabuf_free(plain); 362 wpabuf_free(msg); 363 return NULL; 364 } 365 wpabuf_free(plain); 366 367 if (wps->wps->ap && wps->wps->registrar) { 368 /* 369 * If the Registrar is only learning our current configuration, 370 * it may not continue protocol run to successful completion. 371 * Store information here to make sure it remains available. 372 */ 373 wps_device_store(wps->wps->registrar, &wps->peer_dev, 374 wps->uuid_r); 375 } 376 377 wps->state = RECV_M8; 378 return msg; 379} 380 381 382static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 383{ 384 struct wpabuf *msg; 385 386 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 387 388 msg = wpabuf_alloc(1000); 389 if (msg == NULL) 390 return NULL; 391 392 if (wps_build_version(msg) || 393 wps_build_msg_type(msg, WPS_WSC_DONE) || 394 wps_build_enrollee_nonce(wps, msg) || 395 wps_build_registrar_nonce(wps, msg) || 396 wps_build_wfa_ext(msg, 0, NULL, 0)) { 397 wpabuf_free(msg); 398 return NULL; 399 } 400 401 if (wps->wps->ap) 402 wps->state = RECV_ACK; 403 else { 404 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 405 wps->state = WPS_FINISHED; 406 } 407 return msg; 408} 409 410 411struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 412 enum wsc_op_code *op_code) 413{ 414 struct wpabuf *msg; 415 416 switch (wps->state) { 417 case SEND_M1: 418 msg = wps_build_m1(wps); 419 *op_code = WSC_MSG; 420 break; 421 case SEND_M3: 422 msg = wps_build_m3(wps); 423 *op_code = WSC_MSG; 424 break; 425 case SEND_M5: 426 msg = wps_build_m5(wps); 427 *op_code = WSC_MSG; 428 break; 429 case SEND_M7: 430 msg = wps_build_m7(wps); 431 *op_code = WSC_MSG; 432 break; 433 case RECEIVED_M2D: 434 if (wps->wps->ap) { 435 msg = wps_build_wsc_nack(wps); 436 *op_code = WSC_NACK; 437 break; 438 } 439 msg = wps_build_wsc_ack(wps); 440 *op_code = WSC_ACK; 441 if (msg) { 442 /* Another M2/M2D may be received */ 443 wps->state = RECV_M2; 444 } 445 break; 446 case SEND_WSC_NACK: 447 msg = wps_build_wsc_nack(wps); 448 *op_code = WSC_NACK; 449 break; 450 case WPS_MSG_DONE: 451 msg = wps_build_wsc_done(wps); 452 *op_code = WSC_Done; 453 break; 454 default: 455 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 456 "a message", wps->state); 457 msg = NULL; 458 break; 459 } 460 461 if (*op_code == WSC_MSG && msg) { 462 /* Save a copy of the last message for Authenticator derivation 463 */ 464 wpabuf_free(wps->last_msg); 465 wps->last_msg = wpabuf_dup(msg); 466 } 467 468 return msg; 469} 470 471 472static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 473{ 474 if (r_nonce == NULL) { 475 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 476 return -1; 477 } 478 479 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 480 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 481 wps->nonce_r, WPS_NONCE_LEN); 482 483 return 0; 484} 485 486 487static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 488{ 489 if (e_nonce == NULL) { 490 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 491 return -1; 492 } 493 494 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 495 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 496 return -1; 497 } 498 499 return 0; 500} 501 502 503static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 504{ 505 if (uuid_r == NULL) { 506 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 507 return -1; 508 } 509 510 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 511 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 512 513 return 0; 514} 515 516 517static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 518 size_t pk_len) 519{ 520 if (pk == NULL || pk_len == 0) { 521 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 522 return -1; 523 } 524 525 if (wps->peer_pubkey_hash_set) { 526 u8 hash[WPS_HASH_LEN]; 527 sha256_vector(1, &pk, &pk_len, hash); 528 if (os_memcmp(hash, wps->peer_pubkey_hash, 529 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 530 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 531 wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 532 pk, pk_len); 533 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 534 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 535 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 536 wps->peer_pubkey_hash, 537 WPS_OOB_PUBKEY_HASH_LEN); 538 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 539 return -1; 540 } 541 } 542 543 wpabuf_free(wps->dh_pubkey_r); 544 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 545 if (wps->dh_pubkey_r == NULL) 546 return -1; 547 548 if (wps_derive_keys(wps) < 0) 549 return -1; 550 551 return 0; 552} 553 554 555static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 556{ 557 if (r_hash1 == NULL) { 558 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 559 return -1; 560 } 561 562 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 563 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 564 565 return 0; 566} 567 568 569static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 570{ 571 if (r_hash2 == NULL) { 572 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 573 return -1; 574 } 575 576 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 577 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 578 579 return 0; 580} 581 582 583static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 584{ 585 u8 hash[SHA256_MAC_LEN]; 586 const u8 *addr[4]; 587 size_t len[4]; 588 589 if (r_snonce1 == NULL) { 590 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 591 return -1; 592 } 593 594 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 595 WPS_SECRET_NONCE_LEN); 596 597 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 598 addr[0] = r_snonce1; 599 len[0] = WPS_SECRET_NONCE_LEN; 600 addr[1] = wps->psk1; 601 len[1] = WPS_PSK_LEN; 602 addr[2] = wpabuf_head(wps->dh_pubkey_e); 603 len[2] = wpabuf_len(wps->dh_pubkey_e); 604 addr[3] = wpabuf_head(wps->dh_pubkey_r); 605 len[3] = wpabuf_len(wps->dh_pubkey_r); 606 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 607 608 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 609 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 610 "not match with the pre-committed value"); 611 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 612 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 613 return -1; 614 } 615 616 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 617 "half of the device password"); 618 619 return 0; 620} 621 622 623static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 624{ 625 u8 hash[SHA256_MAC_LEN]; 626 const u8 *addr[4]; 627 size_t len[4]; 628 629 if (r_snonce2 == NULL) { 630 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 631 return -1; 632 } 633 634 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 635 WPS_SECRET_NONCE_LEN); 636 637 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 638 addr[0] = r_snonce2; 639 len[0] = WPS_SECRET_NONCE_LEN; 640 addr[1] = wps->psk2; 641 len[1] = WPS_PSK_LEN; 642 addr[2] = wpabuf_head(wps->dh_pubkey_e); 643 len[2] = wpabuf_len(wps->dh_pubkey_e); 644 addr[3] = wpabuf_head(wps->dh_pubkey_r); 645 len[3] = wpabuf_len(wps->dh_pubkey_r); 646 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 647 648 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 649 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 650 "not match with the pre-committed value"); 651 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 652 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 653 return -1; 654 } 655 656 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 657 "half of the device password"); 658 659 return 0; 660} 661 662 663static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 664 size_t cred_len, int wps2) 665{ 666 struct wps_parse_attr attr; 667 struct wpabuf msg; 668 int ret = 0; 669 670 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 671 os_memset(&wps->cred, 0, sizeof(wps->cred)); 672 wpabuf_set(&msg, cred, cred_len); 673 if (wps_parse_msg(&msg, &attr) < 0 || 674 wps_process_cred(&attr, &wps->cred)) 675 return -1; 676 677 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 678 0) { 679 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 680 MACSTR ") does not match with own address (" MACSTR 681 ")", MAC2STR(wps->cred.mac_addr), 682 MAC2STR(wps->wps->dev.mac_addr)); 683 /* 684 * In theory, this could be consider fatal error, but there are 685 * number of deployed implementations using other address here 686 * due to unclarity in the specification. For interoperability 687 * reasons, allow this to be processed since we do not really 688 * use the MAC Address information for anything. 689 */ 690#ifdef CONFIG_WPS_STRICT 691 if (wps2) { 692 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 693 "MAC Address in AP Settings"); 694 return -1; 695 } 696#endif /* CONFIG_WPS_STRICT */ 697 } 698 699 if (!(wps->cred.encr_type & 700 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 701 if (wps->cred.encr_type & WPS_ENCR_WEP) { 702 wpa_printf(MSG_INFO, "WPS: Reject Credential " 703 "due to WEP configuration"); 704 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 705 return -2; 706 } 707 708 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 709 "invalid encr_type 0x%x", wps->cred.encr_type); 710 return -1; 711 } 712 713 if (wps->wps->cred_cb) { 714 wps->cred.cred_attr = cred - 4; 715 wps->cred.cred_attr_len = cred_len + 4; 716 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 717 wps->cred.cred_attr = NULL; 718 wps->cred.cred_attr_len = 0; 719 } 720 721 return ret; 722} 723 724 725static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 726 size_t cred_len[], size_t num_cred, int wps2) 727{ 728 size_t i; 729 int ok = 0; 730 731 if (wps->wps->ap) 732 return 0; 733 734 if (num_cred == 0) { 735 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 736 "received"); 737 return -1; 738 } 739 740 for (i = 0; i < num_cred; i++) { 741 int res; 742 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 743 if (res == 0) 744 ok++; 745 else if (res == -2) 746 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 747 else 748 return -1; 749 } 750 751 if (ok == 0) { 752 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 753 "received"); 754 return -1; 755 } 756 757 return 0; 758} 759 760 761static int wps_process_ap_settings_e(struct wps_data *wps, 762 struct wps_parse_attr *attr, 763 struct wpabuf *attrs, int wps2) 764{ 765 struct wps_credential cred; 766 767 if (!wps->wps->ap) 768 return 0; 769 770 if (wps_process_ap_settings(attr, &cred) < 0) 771 return -1; 772 773 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 774 "Registrar"); 775 776 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 777 0) { 778 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 779 MACSTR ") does not match with own address (" MACSTR 780 ")", MAC2STR(cred.mac_addr), 781 MAC2STR(wps->wps->dev.mac_addr)); 782 /* 783 * In theory, this could be consider fatal error, but there are 784 * number of deployed implementations using other address here 785 * due to unclarity in the specification. For interoperability 786 * reasons, allow this to be processed since we do not really 787 * use the MAC Address information for anything. 788 */ 789#ifdef CONFIG_WPS_STRICT 790 if (wps2) { 791 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 792 "MAC Address in AP Settings"); 793 return -1; 794 } 795#endif /* CONFIG_WPS_STRICT */ 796 } 797 798 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 799 { 800 if (cred.encr_type & WPS_ENCR_WEP) { 801 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 802 "due to WEP configuration"); 803 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 804 return -1; 805 } 806 807 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 808 "invalid encr_type 0x%x", cred.encr_type); 809 return -1; 810 } 811 812#ifdef CONFIG_WPS_STRICT 813 if (wps2) { 814 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 815 WPS_ENCR_TKIP || 816 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 817 WPS_AUTH_WPAPSK) { 818 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 819 "AP Settings: WPA-Personal/TKIP only"); 820 wps->error_indication = 821 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 822 return -1; 823 } 824 } 825#endif /* CONFIG_WPS_STRICT */ 826 827 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 828 { 829 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 830 "TKIP+AES"); 831 cred.encr_type |= WPS_ENCR_AES; 832 } 833 834 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 835 WPS_AUTH_WPAPSK) { 836 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 837 "WPAPSK+WPA2PSK"); 838 cred.auth_type |= WPS_AUTH_WPA2PSK; 839 } 840 841 if (wps->wps->cred_cb) { 842 cred.cred_attr = wpabuf_head(attrs); 843 cred.cred_attr_len = wpabuf_len(attrs); 844 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 845 } 846 847 return 0; 848} 849 850 851static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 852{ 853 u16 id; 854 855 if (dev_pw_id == NULL) { 856 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 857 return -1; 858 } 859 860 id = WPA_GET_BE16(dev_pw_id); 861 if (wps->dev_pw_id == id) { 862 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 863 return 0; 864 } 865 866#ifdef CONFIG_P2P 867 if ((id == DEV_PW_DEFAULT && 868 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 869 (id == DEV_PW_REGISTRAR_SPECIFIED && 870 wps->dev_pw_id == DEV_PW_DEFAULT)) { 871 /* 872 * Common P2P use cases indicate whether the PIN is from the 873 * client or GO using Device Password Id in M1/M2 in a way that 874 * does not look fully compliant with WSC specification. Anyway, 875 * this is deployed and needs to be allowed, so ignore changes 876 * between Registrar-Specified and Default PIN. 877 */ 878 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 879 "change"); 880 return 0; 881 } 882#endif /* CONFIG_P2P */ 883 884 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 885 "ID from %u to %u", wps->dev_pw_id, id); 886 887 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 888 wpa_printf(MSG_DEBUG, 889 "WPS: Workaround - ignore PBC-to-PIN change"); 890 return 0; 891 } 892 893 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 894 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 895 os_free(wps->dev_password); 896 wps->dev_pw_id = wps->alt_dev_pw_id; 897 wps->dev_password = wps->alt_dev_password; 898 wps->dev_password_len = wps->alt_dev_password_len; 899 wps->alt_dev_password = NULL; 900 wps->alt_dev_password_len = 0; 901 return 0; 902 } 903 904 return -1; 905} 906 907 908static enum wps_process_res wps_process_m2(struct wps_data *wps, 909 const struct wpabuf *msg, 910 struct wps_parse_attr *attr) 911{ 912 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 913 914 if (wps->state != RECV_M2) { 915 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 916 "receiving M2", wps->state); 917 wps->state = SEND_WSC_NACK; 918 return WPS_CONTINUE; 919 } 920 921 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 922 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 923 wps_process_uuid_r(wps, attr->uuid_r) || 924 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 925 wps->state = SEND_WSC_NACK; 926 return WPS_CONTINUE; 927 } 928 929 /* 930 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 931 * special locked mode is used to allow protocol run up to M7 in order 932 * to support external Registrars that only learn the current AP 933 * configuration without changing it. 934 */ 935 if (wps->wps->ap && 936 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 937 wps->dev_password == NULL)) { 938 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 939 "registration of a new Registrar"); 940 wps->config_error = WPS_CFG_SETUP_LOCKED; 941 wps->state = SEND_WSC_NACK; 942 return WPS_CONTINUE; 943 } 944 945 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 946 wps_process_authenticator(wps, attr->authenticator, msg) || 947 wps_process_device_attrs(&wps->peer_dev, attr)) { 948 wps->state = SEND_WSC_NACK; 949 return WPS_CONTINUE; 950 } 951 952#ifdef CONFIG_WPS_NFC 953 if (wps->peer_pubkey_hash_set) { 954 struct wpabuf *decrypted; 955 struct wps_parse_attr eattr; 956 957 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 958 attr->encr_settings_len); 959 if (decrypted == NULL) { 960 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 961 "Encrypted Settings attribute"); 962 wps->state = SEND_WSC_NACK; 963 return WPS_CONTINUE; 964 } 965 966 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 967 "Settings attribute"); 968 if (wps_parse_msg(decrypted, &eattr) < 0 || 969 wps_process_key_wrap_auth(wps, decrypted, 970 eattr.key_wrap_auth) || 971 wps_process_creds(wps, eattr.cred, eattr.cred_len, 972 eattr.num_cred, attr->version2 != NULL)) { 973 wpabuf_free(decrypted); 974 wps->state = SEND_WSC_NACK; 975 return WPS_CONTINUE; 976 } 977 wpabuf_free(decrypted); 978 979 wps->state = WPS_MSG_DONE; 980 return WPS_CONTINUE; 981 } 982#endif /* CONFIG_WPS_NFC */ 983 984 wps->state = SEND_M3; 985 return WPS_CONTINUE; 986} 987 988 989static enum wps_process_res wps_process_m2d(struct wps_data *wps, 990 struct wps_parse_attr *attr) 991{ 992 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 993 994 if (wps->state != RECV_M2) { 995 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 996 "receiving M2D", wps->state); 997 wps->state = SEND_WSC_NACK; 998 return WPS_CONTINUE; 999 } 1000 1001 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1002 attr->manufacturer, attr->manufacturer_len); 1003 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1004 attr->model_name, attr->model_name_len); 1005 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1006 attr->model_number, attr->model_number_len); 1007 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1008 attr->serial_number, attr->serial_number_len); 1009 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1010 attr->dev_name, attr->dev_name_len); 1011 1012 if (wps->wps->event_cb) { 1013 union wps_event_data data; 1014 struct wps_event_m2d *m2d = &data.m2d; 1015 os_memset(&data, 0, sizeof(data)); 1016 if (attr->config_methods) 1017 m2d->config_methods = 1018 WPA_GET_BE16(attr->config_methods); 1019 m2d->manufacturer = attr->manufacturer; 1020 m2d->manufacturer_len = attr->manufacturer_len; 1021 m2d->model_name = attr->model_name; 1022 m2d->model_name_len = attr->model_name_len; 1023 m2d->model_number = attr->model_number; 1024 m2d->model_number_len = attr->model_number_len; 1025 m2d->serial_number = attr->serial_number; 1026 m2d->serial_number_len = attr->serial_number_len; 1027 m2d->dev_name = attr->dev_name; 1028 m2d->dev_name_len = attr->dev_name_len; 1029 m2d->primary_dev_type = attr->primary_dev_type; 1030 if (attr->config_error) 1031 m2d->config_error = 1032 WPA_GET_BE16(attr->config_error); 1033 if (attr->dev_password_id) 1034 m2d->dev_password_id = 1035 WPA_GET_BE16(attr->dev_password_id); 1036 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1037 } 1038 1039 wps->state = RECEIVED_M2D; 1040 return WPS_CONTINUE; 1041} 1042 1043 1044static enum wps_process_res wps_process_m4(struct wps_data *wps, 1045 const struct wpabuf *msg, 1046 struct wps_parse_attr *attr) 1047{ 1048 struct wpabuf *decrypted; 1049 struct wps_parse_attr eattr; 1050 1051 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1052 1053 if (wps->state != RECV_M4) { 1054 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1055 "receiving M4", wps->state); 1056 wps->state = SEND_WSC_NACK; 1057 return WPS_CONTINUE; 1058 } 1059 1060 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1061 wps_process_authenticator(wps, attr->authenticator, msg) || 1062 wps_process_r_hash1(wps, attr->r_hash1) || 1063 wps_process_r_hash2(wps, attr->r_hash2)) { 1064 wps->state = SEND_WSC_NACK; 1065 return WPS_CONTINUE; 1066 } 1067 1068 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1069 attr->encr_settings_len); 1070 if (decrypted == NULL) { 1071 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1072 "Settings attribute"); 1073 wps->state = SEND_WSC_NACK; 1074 return WPS_CONTINUE; 1075 } 1076 1077 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1078 wpabuf_free(decrypted); 1079 wps->state = SEND_WSC_NACK; 1080 return WPS_CONTINUE; 1081 } 1082 1083 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1084 "attribute"); 1085 if (wps_parse_msg(decrypted, &eattr) < 0 || 1086 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1087 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1088 wpabuf_free(decrypted); 1089 wps->state = SEND_WSC_NACK; 1090 return WPS_CONTINUE; 1091 } 1092 wpabuf_free(decrypted); 1093 1094 wps->state = SEND_M5; 1095 return WPS_CONTINUE; 1096} 1097 1098 1099static enum wps_process_res wps_process_m6(struct wps_data *wps, 1100 const struct wpabuf *msg, 1101 struct wps_parse_attr *attr) 1102{ 1103 struct wpabuf *decrypted; 1104 struct wps_parse_attr eattr; 1105 1106 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1107 1108 if (wps->state != RECV_M6) { 1109 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1110 "receiving M6", wps->state); 1111 wps->state = SEND_WSC_NACK; 1112 return WPS_CONTINUE; 1113 } 1114 1115 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1116 wps_process_authenticator(wps, attr->authenticator, msg)) { 1117 wps->state = SEND_WSC_NACK; 1118 return WPS_CONTINUE; 1119 } 1120 1121 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1122 attr->encr_settings_len); 1123 if (decrypted == NULL) { 1124 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1125 "Settings attribute"); 1126 wps->state = SEND_WSC_NACK; 1127 return WPS_CONTINUE; 1128 } 1129 1130 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1131 wpabuf_free(decrypted); 1132 wps->state = SEND_WSC_NACK; 1133 return WPS_CONTINUE; 1134 } 1135 1136 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1137 "attribute"); 1138 if (wps_parse_msg(decrypted, &eattr) < 0 || 1139 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1140 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1141 wpabuf_free(decrypted); 1142 wps->state = SEND_WSC_NACK; 1143 return WPS_CONTINUE; 1144 } 1145 wpabuf_free(decrypted); 1146 1147 if (wps->wps->ap) 1148 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1149 NULL); 1150 1151 wps->state = SEND_M7; 1152 return WPS_CONTINUE; 1153} 1154 1155 1156static enum wps_process_res wps_process_m8(struct wps_data *wps, 1157 const struct wpabuf *msg, 1158 struct wps_parse_attr *attr) 1159{ 1160 struct wpabuf *decrypted; 1161 struct wps_parse_attr eattr; 1162 1163 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1164 1165 if (wps->state != RECV_M8) { 1166 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1167 "receiving M8", wps->state); 1168 wps->state = SEND_WSC_NACK; 1169 return WPS_CONTINUE; 1170 } 1171 1172 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1173 wps_process_authenticator(wps, attr->authenticator, msg)) { 1174 wps->state = SEND_WSC_NACK; 1175 return WPS_CONTINUE; 1176 } 1177 1178 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1179 /* 1180 * Stop here if special ap_setup_locked == 2 mode allowed the 1181 * protocol to continue beyond M2. This allows ER to learn the 1182 * current AP settings without changing them. 1183 */ 1184 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1185 "registration of a new Registrar"); 1186 wps->config_error = WPS_CFG_SETUP_LOCKED; 1187 wps->state = SEND_WSC_NACK; 1188 return WPS_CONTINUE; 1189 } 1190 1191 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1192 attr->encr_settings_len); 1193 if (decrypted == NULL) { 1194 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1195 "Settings attribute"); 1196 wps->state = SEND_WSC_NACK; 1197 return WPS_CONTINUE; 1198 } 1199 1200 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1201 attr->version2 != NULL) < 0) { 1202 wpabuf_free(decrypted); 1203 wps->state = SEND_WSC_NACK; 1204 return WPS_CONTINUE; 1205 } 1206 1207 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1208 "attribute"); 1209 if (wps_parse_msg(decrypted, &eattr) < 0 || 1210 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1211 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1212 eattr.num_cred, attr->version2 != NULL) || 1213 wps_process_ap_settings_e(wps, &eattr, decrypted, 1214 attr->version2 != NULL)) { 1215 wpabuf_free(decrypted); 1216 wps->state = SEND_WSC_NACK; 1217 return WPS_CONTINUE; 1218 } 1219 wpabuf_free(decrypted); 1220 1221 wps->state = WPS_MSG_DONE; 1222 return WPS_CONTINUE; 1223} 1224 1225 1226static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1227 const struct wpabuf *msg) 1228{ 1229 struct wps_parse_attr attr; 1230 enum wps_process_res ret = WPS_CONTINUE; 1231 1232 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1233 1234 if (wps_parse_msg(msg, &attr) < 0) 1235 return WPS_FAILURE; 1236 1237 if (attr.enrollee_nonce == NULL || 1238 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1239 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1240 return WPS_FAILURE; 1241 } 1242 1243 if (attr.msg_type == NULL) { 1244 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1245 wps->state = SEND_WSC_NACK; 1246 return WPS_CONTINUE; 1247 } 1248 1249 switch (*attr.msg_type) { 1250 case WPS_M2: 1251 if (wps_validate_m2(msg) < 0) 1252 return WPS_FAILURE; 1253 ret = wps_process_m2(wps, msg, &attr); 1254 break; 1255 case WPS_M2D: 1256 if (wps_validate_m2d(msg) < 0) 1257 return WPS_FAILURE; 1258 ret = wps_process_m2d(wps, &attr); 1259 break; 1260 case WPS_M4: 1261 if (wps_validate_m4(msg) < 0) 1262 return WPS_FAILURE; 1263 ret = wps_process_m4(wps, msg, &attr); 1264 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1265 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1266 wps->error_indication, 1267 wps->peer_dev.mac_addr); 1268 break; 1269 case WPS_M6: 1270 if (wps_validate_m6(msg) < 0) 1271 return WPS_FAILURE; 1272 ret = wps_process_m6(wps, msg, &attr); 1273 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1274 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1275 wps->error_indication, 1276 wps->peer_dev.mac_addr); 1277 break; 1278 case WPS_M8: 1279 if (wps_validate_m8(msg) < 0) 1280 return WPS_FAILURE; 1281 ret = wps_process_m8(wps, msg, &attr); 1282 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1283 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1284 wps->error_indication, 1285 wps->peer_dev.mac_addr); 1286 break; 1287 default: 1288 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1289 *attr.msg_type); 1290 return WPS_FAILURE; 1291 } 1292 1293 /* 1294 * Save a copy of the last message for Authenticator derivation if we 1295 * are continuing. However, skip M2D since it is not authenticated and 1296 * neither is the ACK/NACK response frame. This allows the possibly 1297 * following M2 to be processed correctly by using the previously sent 1298 * M1 in Authenticator derivation. 1299 */ 1300 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1301 /* Save a copy of the last message for Authenticator derivation 1302 */ 1303 wpabuf_free(wps->last_msg); 1304 wps->last_msg = wpabuf_dup(msg); 1305 } 1306 1307 return ret; 1308} 1309 1310 1311static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1312 const struct wpabuf *msg) 1313{ 1314 struct wps_parse_attr attr; 1315 1316 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1317 1318 if (wps_parse_msg(msg, &attr) < 0) 1319 return WPS_FAILURE; 1320 1321 if (attr.msg_type == NULL) { 1322 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1323 return WPS_FAILURE; 1324 } 1325 1326 if (*attr.msg_type != WPS_WSC_ACK) { 1327 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1328 *attr.msg_type); 1329 return WPS_FAILURE; 1330 } 1331 1332 if (attr.registrar_nonce == NULL || 1333 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1334 { 1335 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1336 return WPS_FAILURE; 1337 } 1338 1339 if (attr.enrollee_nonce == NULL || 1340 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1341 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1342 return WPS_FAILURE; 1343 } 1344 1345 if (wps->state == RECV_ACK && wps->wps->ap) { 1346 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1347 "completed successfully"); 1348 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1349 wps->state = WPS_FINISHED; 1350 return WPS_DONE; 1351 } 1352 1353 return WPS_FAILURE; 1354} 1355 1356 1357static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1358 const struct wpabuf *msg) 1359{ 1360 struct wps_parse_attr attr; 1361 u16 config_error; 1362 1363 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1364 1365 if (wps_parse_msg(msg, &attr) < 0) 1366 return WPS_FAILURE; 1367 1368 if (attr.msg_type == NULL) { 1369 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1370 return WPS_FAILURE; 1371 } 1372 1373 if (*attr.msg_type != WPS_WSC_NACK) { 1374 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1375 *attr.msg_type); 1376 return WPS_FAILURE; 1377 } 1378 1379 if (attr.registrar_nonce == NULL || 1380 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1381 { 1382 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1383 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1384 attr.registrar_nonce, WPS_NONCE_LEN); 1385 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1386 wps->nonce_r, WPS_NONCE_LEN); 1387 return WPS_FAILURE; 1388 } 1389 1390 if (attr.enrollee_nonce == NULL || 1391 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1392 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1393 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1394 attr.enrollee_nonce, WPS_NONCE_LEN); 1395 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1396 wps->nonce_e, WPS_NONCE_LEN); 1397 return WPS_FAILURE; 1398 } 1399 1400 if (attr.config_error == NULL) { 1401 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1402 "in WSC_NACK"); 1403 return WPS_FAILURE; 1404 } 1405 1406 config_error = WPA_GET_BE16(attr.config_error); 1407 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1408 "Configuration Error %d", config_error); 1409 1410 switch (wps->state) { 1411 case RECV_M4: 1412 wps_fail_event(wps->wps, WPS_M3, config_error, 1413 wps->error_indication, wps->peer_dev.mac_addr); 1414 break; 1415 case RECV_M6: 1416 wps_fail_event(wps->wps, WPS_M5, config_error, 1417 wps->error_indication, wps->peer_dev.mac_addr); 1418 break; 1419 case RECV_M8: 1420 wps_fail_event(wps->wps, WPS_M7, config_error, 1421 wps->error_indication, wps->peer_dev.mac_addr); 1422 break; 1423 default: 1424 break; 1425 } 1426 1427 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1428 * Enrollee is Authenticator */ 1429 wps->state = SEND_WSC_NACK; 1430 1431 return WPS_FAILURE; 1432} 1433 1434 1435enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1436 enum wsc_op_code op_code, 1437 const struct wpabuf *msg) 1438{ 1439 1440 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1441 "op_code=%d)", 1442 (unsigned long) wpabuf_len(msg), op_code); 1443 1444 if (op_code == WSC_UPnP) { 1445 /* Determine the OpCode based on message type attribute */ 1446 struct wps_parse_attr attr; 1447 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1448 if (*attr.msg_type == WPS_WSC_ACK) 1449 op_code = WSC_ACK; 1450 else if (*attr.msg_type == WPS_WSC_NACK) 1451 op_code = WSC_NACK; 1452 } 1453 } 1454 1455 switch (op_code) { 1456 case WSC_MSG: 1457 case WSC_UPnP: 1458 return wps_process_wsc_msg(wps, msg); 1459 case WSC_ACK: 1460 if (wps_validate_wsc_ack(msg) < 0) 1461 return WPS_FAILURE; 1462 return wps_process_wsc_ack(wps, msg); 1463 case WSC_NACK: 1464 if (wps_validate_wsc_nack(msg) < 0) 1465 return WPS_FAILURE; 1466 return wps_process_wsc_nack(wps, msg); 1467 default: 1468 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1469 return WPS_FAILURE; 1470 } 1471} 1472