wps_enrollee.c revision 661b4f78e48c697429dc46154a4125892c001718
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 if (wps->wps->ap && random_pool_ready() != 1) { 179 wpa_printf(MSG_INFO, 180 "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); 181 return NULL; 182 } 183 184 msg = wpabuf_alloc(1000); 185 if (msg == NULL) 186 return NULL; 187 188 if (wps_build_version(msg) || 189 wps_build_msg_type(msg, WPS_M3) || 190 wps_build_registrar_nonce(wps, msg) || 191 wps_build_e_hash(wps, msg) || 192 wps_build_wfa_ext(msg, 0, NULL, 0) || 193 wps_build_authenticator(wps, msg)) { 194 wpabuf_free(msg); 195 return NULL; 196 } 197 198 wps->state = RECV_M4; 199 return msg; 200} 201 202 203static struct wpabuf * wps_build_m5(struct wps_data *wps) 204{ 205 struct wpabuf *msg, *plain; 206 207 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 208 209 plain = wpabuf_alloc(200); 210 if (plain == NULL) 211 return NULL; 212 213 msg = wpabuf_alloc(1000); 214 if (msg == NULL) { 215 wpabuf_free(plain); 216 return NULL; 217 } 218 219 if (wps_build_version(msg) || 220 wps_build_msg_type(msg, WPS_M5) || 221 wps_build_registrar_nonce(wps, msg) || 222 wps_build_e_snonce1(wps, plain) || 223 wps_build_key_wrap_auth(wps, plain) || 224 wps_build_encr_settings(wps, msg, plain) || 225 wps_build_wfa_ext(msg, 0, NULL, 0) || 226 wps_build_authenticator(wps, msg)) { 227 wpabuf_free(plain); 228 wpabuf_free(msg); 229 return NULL; 230 } 231 wpabuf_free(plain); 232 233 wps->state = RECV_M6; 234 return msg; 235} 236 237 238static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 239{ 240 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 241 wpabuf_put_be16(msg, ATTR_SSID); 242 wpabuf_put_be16(msg, wps->wps->ssid_len); 243 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 244 return 0; 245} 246 247 248static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 249{ 250 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", 251 wps->wps->ap_auth_type); 252 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 253 wpabuf_put_be16(msg, 2); 254 wpabuf_put_be16(msg, wps->wps->ap_auth_type); 255 return 0; 256} 257 258 259static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 260{ 261 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", 262 wps->wps->ap_encr_type); 263 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 264 wpabuf_put_be16(msg, 2); 265 wpabuf_put_be16(msg, wps->wps->ap_encr_type); 266 return 0; 267} 268 269 270static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 271{ 272 if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 273 wps->wps->network_key_len == 0) { 274 char hex[65]; 275 u8 psk[32]; 276 /* Generate a random per-device PSK */ 277 if (random_pool_ready() != 1 || 278 random_get_bytes(psk, sizeof(psk)) < 0) { 279 wpa_printf(MSG_INFO, 280 "WPS: Could not generate random PSK"); 281 return -1; 282 } 283 wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 284 psk, sizeof(psk)); 285 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 286 (unsigned int) wps->new_psk_len * 2); 287 wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 288 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 289 wpabuf_put_be16(msg, sizeof(psk) * 2); 290 wpabuf_put_data(msg, hex, sizeof(psk) * 2); 291 if (wps->wps->registrar) { 292 wps_cb_new_psk(wps->wps->registrar, 293 wps->peer_dev.mac_addr, 294 wps->p2p_dev_addr, psk, sizeof(psk)); 295 } 296 return 0; 297 } 298 299 wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 300 (unsigned int) wps->wps->network_key_len); 301 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 302 wpabuf_put_be16(msg, wps->wps->network_key_len); 303 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 304 return 0; 305} 306 307 308static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 309{ 310 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 311 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 312 wpabuf_put_be16(msg, ETH_ALEN); 313 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 314 return 0; 315} 316 317 318static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 319{ 320 const u8 *start, *end; 321 int ret; 322 323 if (wps->wps->ap_settings) { 324 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 325 wpabuf_put_data(plain, wps->wps->ap_settings, 326 wps->wps->ap_settings_len); 327 return 0; 328 } 329 330 wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 331 start = wpabuf_put(plain, 0); 332 ret = wps_build_cred_ssid(wps, plain) || 333 wps_build_cred_mac_addr(wps, plain) || 334 wps_build_cred_auth_type(wps, plain) || 335 wps_build_cred_encr_type(wps, plain) || 336 wps_build_cred_network_key(wps, plain); 337 end = wpabuf_put(plain, 0); 338 339 wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 340 start, end - start); 341 342 return ret; 343} 344 345 346static struct wpabuf * wps_build_m7(struct wps_data *wps) 347{ 348 struct wpabuf *msg, *plain; 349 350 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 351 352 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 353 if (plain == NULL) 354 return NULL; 355 356 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 357 if (msg == NULL) { 358 wpabuf_free(plain); 359 return NULL; 360 } 361 362 if (wps_build_version(msg) || 363 wps_build_msg_type(msg, WPS_M7) || 364 wps_build_registrar_nonce(wps, msg) || 365 wps_build_e_snonce2(wps, plain) || 366 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 367 wps_build_key_wrap_auth(wps, plain) || 368 wps_build_encr_settings(wps, msg, plain) || 369 wps_build_wfa_ext(msg, 0, NULL, 0) || 370 wps_build_authenticator(wps, msg)) { 371 wpabuf_free(plain); 372 wpabuf_free(msg); 373 return NULL; 374 } 375 wpabuf_free(plain); 376 377 if (wps->wps->ap && wps->wps->registrar) { 378 /* 379 * If the Registrar is only learning our current configuration, 380 * it may not continue protocol run to successful completion. 381 * Store information here to make sure it remains available. 382 */ 383 wps_device_store(wps->wps->registrar, &wps->peer_dev, 384 wps->uuid_r); 385 } 386 387 wps->state = RECV_M8; 388 return msg; 389} 390 391 392static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 393{ 394 struct wpabuf *msg; 395 396 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 397 398 msg = wpabuf_alloc(1000); 399 if (msg == NULL) 400 return NULL; 401 402 if (wps_build_version(msg) || 403 wps_build_msg_type(msg, WPS_WSC_DONE) || 404 wps_build_enrollee_nonce(wps, msg) || 405 wps_build_registrar_nonce(wps, msg) || 406 wps_build_wfa_ext(msg, 0, NULL, 0)) { 407 wpabuf_free(msg); 408 return NULL; 409 } 410 411 if (wps->wps->ap) 412 wps->state = RECV_ACK; 413 else { 414 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 415 wps->state = WPS_FINISHED; 416 } 417 return msg; 418} 419 420 421struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 422 enum wsc_op_code *op_code) 423{ 424 struct wpabuf *msg; 425 426 switch (wps->state) { 427 case SEND_M1: 428 msg = wps_build_m1(wps); 429 *op_code = WSC_MSG; 430 break; 431 case SEND_M3: 432 msg = wps_build_m3(wps); 433 *op_code = WSC_MSG; 434 break; 435 case SEND_M5: 436 msg = wps_build_m5(wps); 437 *op_code = WSC_MSG; 438 break; 439 case SEND_M7: 440 msg = wps_build_m7(wps); 441 *op_code = WSC_MSG; 442 break; 443 case RECEIVED_M2D: 444 if (wps->wps->ap) { 445 msg = wps_build_wsc_nack(wps); 446 *op_code = WSC_NACK; 447 break; 448 } 449 msg = wps_build_wsc_ack(wps); 450 *op_code = WSC_ACK; 451 if (msg) { 452 /* Another M2/M2D may be received */ 453 wps->state = RECV_M2; 454 } 455 break; 456 case SEND_WSC_NACK: 457 msg = wps_build_wsc_nack(wps); 458 *op_code = WSC_NACK; 459 break; 460 case WPS_MSG_DONE: 461 msg = wps_build_wsc_done(wps); 462 *op_code = WSC_Done; 463 break; 464 default: 465 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 466 "a message", wps->state); 467 msg = NULL; 468 break; 469 } 470 471 if (*op_code == WSC_MSG && msg) { 472 /* Save a copy of the last message for Authenticator derivation 473 */ 474 wpabuf_free(wps->last_msg); 475 wps->last_msg = wpabuf_dup(msg); 476 } 477 478 return msg; 479} 480 481 482static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 483{ 484 if (r_nonce == NULL) { 485 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 486 return -1; 487 } 488 489 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 490 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 491 wps->nonce_r, WPS_NONCE_LEN); 492 493 return 0; 494} 495 496 497static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 498{ 499 if (e_nonce == NULL) { 500 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 501 return -1; 502 } 503 504 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 505 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 506 return -1; 507 } 508 509 return 0; 510} 511 512 513static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 514{ 515 if (uuid_r == NULL) { 516 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 517 return -1; 518 } 519 520 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 521 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 522 523 return 0; 524} 525 526 527static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 528 size_t pk_len) 529{ 530 if (pk == NULL || pk_len == 0) { 531 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 532 return -1; 533 } 534 535 if (wps->peer_pubkey_hash_set) { 536 u8 hash[WPS_HASH_LEN]; 537 sha256_vector(1, &pk, &pk_len, hash); 538 if (os_memcmp_const(hash, wps->peer_pubkey_hash, 539 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 540 wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 541 wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 542 pk, pk_len); 543 wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 544 "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 545 wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 546 wps->peer_pubkey_hash, 547 WPS_OOB_PUBKEY_HASH_LEN); 548 wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 549 return -1; 550 } 551 } 552 553 wpabuf_free(wps->dh_pubkey_r); 554 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 555 if (wps->dh_pubkey_r == NULL) 556 return -1; 557 558 if (wps_derive_keys(wps) < 0) 559 return -1; 560 561 return 0; 562} 563 564 565static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 566{ 567 if (r_hash1 == NULL) { 568 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 569 return -1; 570 } 571 572 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 573 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 574 575 return 0; 576} 577 578 579static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 580{ 581 if (r_hash2 == NULL) { 582 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 583 return -1; 584 } 585 586 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 587 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 588 589 return 0; 590} 591 592 593static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 594{ 595 u8 hash[SHA256_MAC_LEN]; 596 const u8 *addr[4]; 597 size_t len[4]; 598 599 if (r_snonce1 == NULL) { 600 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 601 return -1; 602 } 603 604 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 605 WPS_SECRET_NONCE_LEN); 606 607 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 608 addr[0] = r_snonce1; 609 len[0] = WPS_SECRET_NONCE_LEN; 610 addr[1] = wps->psk1; 611 len[1] = WPS_PSK_LEN; 612 addr[2] = wpabuf_head(wps->dh_pubkey_e); 613 len[2] = wpabuf_len(wps->dh_pubkey_e); 614 addr[3] = wpabuf_head(wps->dh_pubkey_r); 615 len[3] = wpabuf_len(wps->dh_pubkey_r); 616 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 617 618 if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 619 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 620 "not match with the pre-committed value"); 621 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 622 wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 623 return -1; 624 } 625 626 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 627 "half of the device password"); 628 629 return 0; 630} 631 632 633static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 634{ 635 u8 hash[SHA256_MAC_LEN]; 636 const u8 *addr[4]; 637 size_t len[4]; 638 639 if (r_snonce2 == NULL) { 640 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 641 return -1; 642 } 643 644 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 645 WPS_SECRET_NONCE_LEN); 646 647 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 648 addr[0] = r_snonce2; 649 len[0] = WPS_SECRET_NONCE_LEN; 650 addr[1] = wps->psk2; 651 len[1] = WPS_PSK_LEN; 652 addr[2] = wpabuf_head(wps->dh_pubkey_e); 653 len[2] = wpabuf_len(wps->dh_pubkey_e); 654 addr[3] = wpabuf_head(wps->dh_pubkey_r); 655 len[3] = wpabuf_len(wps->dh_pubkey_r); 656 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 657 658 if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 659 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 660 "not match with the pre-committed value"); 661 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 662 wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 663 return -1; 664 } 665 666 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 667 "half of the device password"); 668 669 return 0; 670} 671 672 673static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 674 size_t cred_len, int wps2) 675{ 676 struct wps_parse_attr attr; 677 struct wpabuf msg; 678 int ret = 0; 679 680 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 681 os_memset(&wps->cred, 0, sizeof(wps->cred)); 682 wpabuf_set(&msg, cred, cred_len); 683 if (wps_parse_msg(&msg, &attr) < 0 || 684 wps_process_cred(&attr, &wps->cred)) 685 return -1; 686 687 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 688 0) { 689 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 690 MACSTR ") does not match with own address (" MACSTR 691 ")", MAC2STR(wps->cred.mac_addr), 692 MAC2STR(wps->wps->dev.mac_addr)); 693 /* 694 * In theory, this could be consider fatal error, but there are 695 * number of deployed implementations using other address here 696 * due to unclarity in the specification. For interoperability 697 * reasons, allow this to be processed since we do not really 698 * use the MAC Address information for anything. 699 */ 700#ifdef CONFIG_WPS_STRICT 701 if (wps2) { 702 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 703 "MAC Address in AP Settings"); 704 return -1; 705 } 706#endif /* CONFIG_WPS_STRICT */ 707 } 708 709 if (!(wps->cred.encr_type & 710 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 711 if (wps->cred.encr_type & WPS_ENCR_WEP) { 712 wpa_printf(MSG_INFO, "WPS: Reject Credential " 713 "due to WEP configuration"); 714 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 715 return -2; 716 } 717 718 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 719 "invalid encr_type 0x%x", wps->cred.encr_type); 720 return -1; 721 } 722 723 if (wps->wps->cred_cb) { 724 wps->cred.cred_attr = cred - 4; 725 wps->cred.cred_attr_len = cred_len + 4; 726 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 727 wps->cred.cred_attr = NULL; 728 wps->cred.cred_attr_len = 0; 729 } 730 731 return ret; 732} 733 734 735static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 736 size_t cred_len[], size_t num_cred, int wps2) 737{ 738 size_t i; 739 int ok = 0; 740 741 if (wps->wps->ap) 742 return 0; 743 744 if (num_cred == 0) { 745 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 746 "received"); 747 return -1; 748 } 749 750 for (i = 0; i < num_cred; i++) { 751 int res; 752 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 753 if (res == 0) 754 ok++; 755 else if (res == -2) 756 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 757 else 758 return -1; 759 } 760 761 if (ok == 0) { 762 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 763 "received"); 764 return -1; 765 } 766 767 return 0; 768} 769 770 771static int wps_process_ap_settings_e(struct wps_data *wps, 772 struct wps_parse_attr *attr, 773 struct wpabuf *attrs, int wps2) 774{ 775 struct wps_credential cred; 776 777 if (!wps->wps->ap) 778 return 0; 779 780 if (wps_process_ap_settings(attr, &cred) < 0) 781 return -1; 782 783 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 784 "Registrar"); 785 786 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 787 0) { 788 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 789 MACSTR ") does not match with own address (" MACSTR 790 ")", MAC2STR(cred.mac_addr), 791 MAC2STR(wps->wps->dev.mac_addr)); 792 /* 793 * In theory, this could be consider fatal error, but there are 794 * number of deployed implementations using other address here 795 * due to unclarity in the specification. For interoperability 796 * reasons, allow this to be processed since we do not really 797 * use the MAC Address information for anything. 798 */ 799#ifdef CONFIG_WPS_STRICT 800 if (wps2) { 801 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 802 "MAC Address in AP Settings"); 803 return -1; 804 } 805#endif /* CONFIG_WPS_STRICT */ 806 } 807 808 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 809 { 810 if (cred.encr_type & WPS_ENCR_WEP) { 811 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 812 "due to WEP configuration"); 813 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 814 return -1; 815 } 816 817 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 818 "invalid encr_type 0x%x", cred.encr_type); 819 return -1; 820 } 821 822#ifdef CONFIG_WPS_STRICT 823 if (wps2) { 824 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 825 WPS_ENCR_TKIP || 826 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 827 WPS_AUTH_WPAPSK) { 828 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 829 "AP Settings: WPA-Personal/TKIP only"); 830 wps->error_indication = 831 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 832 return -1; 833 } 834 } 835#endif /* CONFIG_WPS_STRICT */ 836 837 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 838 { 839 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 840 "TKIP+AES"); 841 cred.encr_type |= WPS_ENCR_AES; 842 } 843 844 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 845 WPS_AUTH_WPAPSK) { 846 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 847 "WPAPSK+WPA2PSK"); 848 cred.auth_type |= WPS_AUTH_WPA2PSK; 849 } 850 851 if (wps->wps->cred_cb) { 852 cred.cred_attr = wpabuf_head(attrs); 853 cred.cred_attr_len = wpabuf_len(attrs); 854 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 855 } 856 857 return 0; 858} 859 860 861static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 862{ 863 u16 id; 864 865 if (dev_pw_id == NULL) { 866 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 867 return -1; 868 } 869 870 id = WPA_GET_BE16(dev_pw_id); 871 if (wps->dev_pw_id == id) { 872 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 873 return 0; 874 } 875 876#ifdef CONFIG_P2P 877 if ((id == DEV_PW_DEFAULT && 878 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 879 (id == DEV_PW_REGISTRAR_SPECIFIED && 880 wps->dev_pw_id == DEV_PW_DEFAULT)) { 881 /* 882 * Common P2P use cases indicate whether the PIN is from the 883 * client or GO using Device Password Id in M1/M2 in a way that 884 * does not look fully compliant with WSC specification. Anyway, 885 * this is deployed and needs to be allowed, so ignore changes 886 * between Registrar-Specified and Default PIN. 887 */ 888 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 889 "change"); 890 return 0; 891 } 892#endif /* CONFIG_P2P */ 893 894 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 895 "ID from %u to %u", wps->dev_pw_id, id); 896 897 if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 898 wpa_printf(MSG_DEBUG, 899 "WPS: Workaround - ignore PBC-to-PIN change"); 900 return 0; 901 } 902 903 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 904 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 905 bin_clear_free(wps->dev_password, wps->dev_password_len); 906 wps->dev_pw_id = wps->alt_dev_pw_id; 907 wps->dev_password = wps->alt_dev_password; 908 wps->dev_password_len = wps->alt_dev_password_len; 909 wps->alt_dev_password = NULL; 910 wps->alt_dev_password_len = 0; 911 return 0; 912 } 913 914 return -1; 915} 916 917 918static enum wps_process_res wps_process_m2(struct wps_data *wps, 919 const struct wpabuf *msg, 920 struct wps_parse_attr *attr) 921{ 922 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 923 924 if (wps->state != RECV_M2) { 925 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 926 "receiving M2", wps->state); 927 wps->state = SEND_WSC_NACK; 928 return WPS_CONTINUE; 929 } 930 931 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 932 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 933 wps_process_uuid_r(wps, attr->uuid_r) || 934 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 935 wps->state = SEND_WSC_NACK; 936 return WPS_CONTINUE; 937 } 938 939 /* 940 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 941 * special locked mode is used to allow protocol run up to M7 in order 942 * to support external Registrars that only learn the current AP 943 * configuration without changing it. 944 */ 945 if (wps->wps->ap && 946 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 947 wps->dev_password == NULL)) { 948 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 949 "registration of a new Registrar"); 950 wps->config_error = WPS_CFG_SETUP_LOCKED; 951 wps->state = SEND_WSC_NACK; 952 return WPS_CONTINUE; 953 } 954 955 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 956 wps_process_authenticator(wps, attr->authenticator, msg) || 957 wps_process_device_attrs(&wps->peer_dev, attr)) { 958 wps->state = SEND_WSC_NACK; 959 return WPS_CONTINUE; 960 } 961 962#ifdef CONFIG_WPS_NFC 963 if (wps->peer_pubkey_hash_set) { 964 struct wpabuf *decrypted; 965 struct wps_parse_attr eattr; 966 967 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 968 attr->encr_settings_len); 969 if (decrypted == NULL) { 970 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 971 "Encrypted Settings attribute"); 972 wps->state = SEND_WSC_NACK; 973 return WPS_CONTINUE; 974 } 975 976 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 977 "Settings attribute"); 978 if (wps_parse_msg(decrypted, &eattr) < 0 || 979 wps_process_key_wrap_auth(wps, decrypted, 980 eattr.key_wrap_auth) || 981 wps_process_creds(wps, eattr.cred, eattr.cred_len, 982 eattr.num_cred, attr->version2 != NULL)) { 983 wpabuf_free(decrypted); 984 wps->state = SEND_WSC_NACK; 985 return WPS_CONTINUE; 986 } 987 wpabuf_free(decrypted); 988 989 wps->state = WPS_MSG_DONE; 990 return WPS_CONTINUE; 991 } 992#endif /* CONFIG_WPS_NFC */ 993 994 wps->state = SEND_M3; 995 return WPS_CONTINUE; 996} 997 998 999static enum wps_process_res wps_process_m2d(struct wps_data *wps, 1000 struct wps_parse_attr *attr) 1001{ 1002 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1003 1004 if (wps->state != RECV_M2) { 1005 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1006 "receiving M2D", wps->state); 1007 wps->state = SEND_WSC_NACK; 1008 return WPS_CONTINUE; 1009 } 1010 1011 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1012 attr->manufacturer, attr->manufacturer_len); 1013 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1014 attr->model_name, attr->model_name_len); 1015 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1016 attr->model_number, attr->model_number_len); 1017 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1018 attr->serial_number, attr->serial_number_len); 1019 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1020 attr->dev_name, attr->dev_name_len); 1021 1022 if (wps->wps->event_cb) { 1023 union wps_event_data data; 1024 struct wps_event_m2d *m2d = &data.m2d; 1025 os_memset(&data, 0, sizeof(data)); 1026 if (attr->config_methods) 1027 m2d->config_methods = 1028 WPA_GET_BE16(attr->config_methods); 1029 m2d->manufacturer = attr->manufacturer; 1030 m2d->manufacturer_len = attr->manufacturer_len; 1031 m2d->model_name = attr->model_name; 1032 m2d->model_name_len = attr->model_name_len; 1033 m2d->model_number = attr->model_number; 1034 m2d->model_number_len = attr->model_number_len; 1035 m2d->serial_number = attr->serial_number; 1036 m2d->serial_number_len = attr->serial_number_len; 1037 m2d->dev_name = attr->dev_name; 1038 m2d->dev_name_len = attr->dev_name_len; 1039 m2d->primary_dev_type = attr->primary_dev_type; 1040 if (attr->config_error) 1041 m2d->config_error = 1042 WPA_GET_BE16(attr->config_error); 1043 if (attr->dev_password_id) 1044 m2d->dev_password_id = 1045 WPA_GET_BE16(attr->dev_password_id); 1046 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1047 } 1048 1049 wps->state = RECEIVED_M2D; 1050 return WPS_CONTINUE; 1051} 1052 1053 1054static enum wps_process_res wps_process_m4(struct wps_data *wps, 1055 const struct wpabuf *msg, 1056 struct wps_parse_attr *attr) 1057{ 1058 struct wpabuf *decrypted; 1059 struct wps_parse_attr eattr; 1060 1061 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1062 1063 if (wps->state != RECV_M4) { 1064 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1065 "receiving M4", wps->state); 1066 wps->state = SEND_WSC_NACK; 1067 return WPS_CONTINUE; 1068 } 1069 1070 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1071 wps_process_authenticator(wps, attr->authenticator, msg) || 1072 wps_process_r_hash1(wps, attr->r_hash1) || 1073 wps_process_r_hash2(wps, attr->r_hash2)) { 1074 wps->state = SEND_WSC_NACK; 1075 return WPS_CONTINUE; 1076 } 1077 1078 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1079 attr->encr_settings_len); 1080 if (decrypted == NULL) { 1081 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1082 "Settings attribute"); 1083 wps->state = SEND_WSC_NACK; 1084 return WPS_CONTINUE; 1085 } 1086 1087 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1088 wpabuf_free(decrypted); 1089 wps->state = SEND_WSC_NACK; 1090 return WPS_CONTINUE; 1091 } 1092 1093 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1094 "attribute"); 1095 if (wps_parse_msg(decrypted, &eattr) < 0 || 1096 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1097 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1098 wpabuf_free(decrypted); 1099 wps->state = SEND_WSC_NACK; 1100 return WPS_CONTINUE; 1101 } 1102 wpabuf_free(decrypted); 1103 1104 wps->state = SEND_M5; 1105 return WPS_CONTINUE; 1106} 1107 1108 1109static enum wps_process_res wps_process_m6(struct wps_data *wps, 1110 const struct wpabuf *msg, 1111 struct wps_parse_attr *attr) 1112{ 1113 struct wpabuf *decrypted; 1114 struct wps_parse_attr eattr; 1115 1116 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1117 1118 if (wps->state != RECV_M6) { 1119 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1120 "receiving M6", wps->state); 1121 wps->state = SEND_WSC_NACK; 1122 return WPS_CONTINUE; 1123 } 1124 1125 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1126 wps_process_authenticator(wps, attr->authenticator, msg)) { 1127 wps->state = SEND_WSC_NACK; 1128 return WPS_CONTINUE; 1129 } 1130 1131 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1132 attr->encr_settings_len); 1133 if (decrypted == NULL) { 1134 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1135 "Settings attribute"); 1136 wps->state = SEND_WSC_NACK; 1137 return WPS_CONTINUE; 1138 } 1139 1140 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1141 wpabuf_free(decrypted); 1142 wps->state = SEND_WSC_NACK; 1143 return WPS_CONTINUE; 1144 } 1145 1146 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1147 "attribute"); 1148 if (wps_parse_msg(decrypted, &eattr) < 0 || 1149 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1150 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1151 wpabuf_free(decrypted); 1152 wps->state = SEND_WSC_NACK; 1153 return WPS_CONTINUE; 1154 } 1155 wpabuf_free(decrypted); 1156 1157 if (wps->wps->ap) 1158 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1159 NULL); 1160 1161 wps->state = SEND_M7; 1162 return WPS_CONTINUE; 1163} 1164 1165 1166static enum wps_process_res wps_process_m8(struct wps_data *wps, 1167 const struct wpabuf *msg, 1168 struct wps_parse_attr *attr) 1169{ 1170 struct wpabuf *decrypted; 1171 struct wps_parse_attr eattr; 1172 1173 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1174 1175 if (wps->state != RECV_M8) { 1176 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1177 "receiving M8", wps->state); 1178 wps->state = SEND_WSC_NACK; 1179 return WPS_CONTINUE; 1180 } 1181 1182 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1183 wps_process_authenticator(wps, attr->authenticator, msg)) { 1184 wps->state = SEND_WSC_NACK; 1185 return WPS_CONTINUE; 1186 } 1187 1188 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1189 /* 1190 * Stop here if special ap_setup_locked == 2 mode allowed the 1191 * protocol to continue beyond M2. This allows ER to learn the 1192 * current AP settings without changing them. 1193 */ 1194 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1195 "registration of a new Registrar"); 1196 wps->config_error = WPS_CFG_SETUP_LOCKED; 1197 wps->state = SEND_WSC_NACK; 1198 return WPS_CONTINUE; 1199 } 1200 1201 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1202 attr->encr_settings_len); 1203 if (decrypted == NULL) { 1204 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1205 "Settings attribute"); 1206 wps->state = SEND_WSC_NACK; 1207 return WPS_CONTINUE; 1208 } 1209 1210 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1211 attr->version2 != NULL) < 0) { 1212 wpabuf_free(decrypted); 1213 wps->state = SEND_WSC_NACK; 1214 return WPS_CONTINUE; 1215 } 1216 1217 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1218 "attribute"); 1219 if (wps_parse_msg(decrypted, &eattr) < 0 || 1220 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1221 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1222 eattr.num_cred, attr->version2 != NULL) || 1223 wps_process_ap_settings_e(wps, &eattr, decrypted, 1224 attr->version2 != NULL)) { 1225 wpabuf_free(decrypted); 1226 wps->state = SEND_WSC_NACK; 1227 return WPS_CONTINUE; 1228 } 1229 wpabuf_free(decrypted); 1230 1231 wps->state = WPS_MSG_DONE; 1232 return WPS_CONTINUE; 1233} 1234 1235 1236static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1237 const struct wpabuf *msg) 1238{ 1239 struct wps_parse_attr attr; 1240 enum wps_process_res ret = WPS_CONTINUE; 1241 1242 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1243 1244 if (wps_parse_msg(msg, &attr) < 0) 1245 return WPS_FAILURE; 1246 1247 if (attr.enrollee_nonce == NULL || 1248 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1249 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1250 return WPS_FAILURE; 1251 } 1252 1253 if (attr.msg_type == NULL) { 1254 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1255 wps->state = SEND_WSC_NACK; 1256 return WPS_CONTINUE; 1257 } 1258 1259 switch (*attr.msg_type) { 1260 case WPS_M2: 1261 if (wps_validate_m2(msg) < 0) 1262 return WPS_FAILURE; 1263 ret = wps_process_m2(wps, msg, &attr); 1264 break; 1265 case WPS_M2D: 1266 if (wps_validate_m2d(msg) < 0) 1267 return WPS_FAILURE; 1268 ret = wps_process_m2d(wps, &attr); 1269 break; 1270 case WPS_M4: 1271 if (wps_validate_m4(msg) < 0) 1272 return WPS_FAILURE; 1273 ret = wps_process_m4(wps, msg, &attr); 1274 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1275 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1276 wps->error_indication, 1277 wps->peer_dev.mac_addr); 1278 break; 1279 case WPS_M6: 1280 if (wps_validate_m6(msg) < 0) 1281 return WPS_FAILURE; 1282 ret = wps_process_m6(wps, msg, &attr); 1283 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1284 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1285 wps->error_indication, 1286 wps->peer_dev.mac_addr); 1287 break; 1288 case WPS_M8: 1289 if (wps_validate_m8(msg) < 0) 1290 return WPS_FAILURE; 1291 ret = wps_process_m8(wps, msg, &attr); 1292 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1293 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1294 wps->error_indication, 1295 wps->peer_dev.mac_addr); 1296 break; 1297 default: 1298 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1299 *attr.msg_type); 1300 return WPS_FAILURE; 1301 } 1302 1303 /* 1304 * Save a copy of the last message for Authenticator derivation if we 1305 * are continuing. However, skip M2D since it is not authenticated and 1306 * neither is the ACK/NACK response frame. This allows the possibly 1307 * following M2 to be processed correctly by using the previously sent 1308 * M1 in Authenticator derivation. 1309 */ 1310 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1311 /* Save a copy of the last message for Authenticator derivation 1312 */ 1313 wpabuf_free(wps->last_msg); 1314 wps->last_msg = wpabuf_dup(msg); 1315 } 1316 1317 return ret; 1318} 1319 1320 1321static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1322 const struct wpabuf *msg) 1323{ 1324 struct wps_parse_attr attr; 1325 1326 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1327 1328 if (wps_parse_msg(msg, &attr) < 0) 1329 return WPS_FAILURE; 1330 1331 if (attr.msg_type == NULL) { 1332 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1333 return WPS_FAILURE; 1334 } 1335 1336 if (*attr.msg_type != WPS_WSC_ACK) { 1337 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1338 *attr.msg_type); 1339 return WPS_FAILURE; 1340 } 1341 1342 if (attr.registrar_nonce == NULL || 1343 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1344 { 1345 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1346 return WPS_FAILURE; 1347 } 1348 1349 if (attr.enrollee_nonce == NULL || 1350 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1351 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1352 return WPS_FAILURE; 1353 } 1354 1355 if (wps->state == RECV_ACK && wps->wps->ap) { 1356 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1357 "completed successfully"); 1358 wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1359 wps->state = WPS_FINISHED; 1360 return WPS_DONE; 1361 } 1362 1363 return WPS_FAILURE; 1364} 1365 1366 1367static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1368 const struct wpabuf *msg) 1369{ 1370 struct wps_parse_attr attr; 1371 u16 config_error; 1372 1373 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1374 1375 if (wps_parse_msg(msg, &attr) < 0) 1376 return WPS_FAILURE; 1377 1378 if (attr.msg_type == NULL) { 1379 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1380 return WPS_FAILURE; 1381 } 1382 1383 if (*attr.msg_type != WPS_WSC_NACK) { 1384 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1385 *attr.msg_type); 1386 return WPS_FAILURE; 1387 } 1388 1389 if (attr.registrar_nonce == NULL || 1390 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1391 { 1392 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1393 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1394 attr.registrar_nonce, WPS_NONCE_LEN); 1395 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1396 wps->nonce_r, WPS_NONCE_LEN); 1397 return WPS_FAILURE; 1398 } 1399 1400 if (attr.enrollee_nonce == NULL || 1401 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1402 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1403 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1404 attr.enrollee_nonce, WPS_NONCE_LEN); 1405 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1406 wps->nonce_e, WPS_NONCE_LEN); 1407 return WPS_FAILURE; 1408 } 1409 1410 if (attr.config_error == NULL) { 1411 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1412 "in WSC_NACK"); 1413 return WPS_FAILURE; 1414 } 1415 1416 config_error = WPA_GET_BE16(attr.config_error); 1417 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1418 "Configuration Error %d", config_error); 1419 1420 switch (wps->state) { 1421 case RECV_M4: 1422 wps_fail_event(wps->wps, WPS_M3, config_error, 1423 wps->error_indication, wps->peer_dev.mac_addr); 1424 break; 1425 case RECV_M6: 1426 wps_fail_event(wps->wps, WPS_M5, config_error, 1427 wps->error_indication, wps->peer_dev.mac_addr); 1428 break; 1429 case RECV_M8: 1430 wps_fail_event(wps->wps, WPS_M7, config_error, 1431 wps->error_indication, wps->peer_dev.mac_addr); 1432 break; 1433 default: 1434 break; 1435 } 1436 1437 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1438 * Enrollee is Authenticator */ 1439 wps->state = SEND_WSC_NACK; 1440 1441 return WPS_FAILURE; 1442} 1443 1444 1445enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1446 enum wsc_op_code op_code, 1447 const struct wpabuf *msg) 1448{ 1449 1450 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1451 "op_code=%d)", 1452 (unsigned long) wpabuf_len(msg), op_code); 1453 1454 if (op_code == WSC_UPnP) { 1455 /* Determine the OpCode based on message type attribute */ 1456 struct wps_parse_attr attr; 1457 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1458 if (*attr.msg_type == WPS_WSC_ACK) 1459 op_code = WSC_ACK; 1460 else if (*attr.msg_type == WPS_WSC_NACK) 1461 op_code = WSC_NACK; 1462 } 1463 } 1464 1465 switch (op_code) { 1466 case WSC_MSG: 1467 case WSC_UPnP: 1468 return wps_process_wsc_msg(wps, msg); 1469 case WSC_ACK: 1470 if (wps_validate_wsc_ack(msg) < 0) 1471 return WPS_FAILURE; 1472 return wps_process_wsc_ack(wps, msg); 1473 case WSC_NACK: 1474 if (wps_validate_wsc_nack(msg) < 0) 1475 return WPS_FAILURE; 1476 return wps_process_wsc_nack(wps, msg); 1477 default: 1478 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1479 return WPS_FAILURE; 1480 } 1481} 1482