wps_enrollee.c revision 8bae4138a0356709720a96f3e50b4d734e532c12
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_build_assoc_state(wps, msg) || 153 wps_build_dev_password_id(msg, wps->dev_pw_id) || 154 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 155 wps_build_os_version(&wps->wps->dev, msg) || 156 wps_build_wfa_ext(msg, 0, NULL, 0) || 157 wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 158 wpabuf_free(msg); 159 return NULL; 160 } 161 162 wps->state = RECV_M2; 163 return msg; 164} 165 166 167static struct wpabuf * wps_build_m3(struct wps_data *wps) 168{ 169 struct wpabuf *msg; 170 171 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 172 173 if (wps->dev_password == NULL) { 174 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 175 return NULL; 176 } 177 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 178 179 msg = wpabuf_alloc(1000); 180 if (msg == NULL) 181 return NULL; 182 183 if (wps_build_version(msg) || 184 wps_build_msg_type(msg, WPS_M3) || 185 wps_build_registrar_nonce(wps, msg) || 186 wps_build_e_hash(wps, msg) || 187 wps_build_wfa_ext(msg, 0, NULL, 0) || 188 wps_build_authenticator(wps, msg)) { 189 wpabuf_free(msg); 190 return NULL; 191 } 192 193 wps->state = RECV_M4; 194 return msg; 195} 196 197 198static struct wpabuf * wps_build_m5(struct wps_data *wps) 199{ 200 struct wpabuf *msg, *plain; 201 202 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 203 204 plain = wpabuf_alloc(200); 205 if (plain == NULL) 206 return NULL; 207 208 msg = wpabuf_alloc(1000); 209 if (msg == NULL) { 210 wpabuf_free(plain); 211 return NULL; 212 } 213 214 if (wps_build_version(msg) || 215 wps_build_msg_type(msg, WPS_M5) || 216 wps_build_registrar_nonce(wps, msg) || 217 wps_build_e_snonce1(wps, plain) || 218 wps_build_key_wrap_auth(wps, plain) || 219 wps_build_encr_settings(wps, msg, plain) || 220 wps_build_wfa_ext(msg, 0, NULL, 0) || 221 wps_build_authenticator(wps, msg)) { 222 wpabuf_free(plain); 223 wpabuf_free(msg); 224 return NULL; 225 } 226 wpabuf_free(plain); 227 228 wps->state = RECV_M6; 229 return msg; 230} 231 232 233static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 234{ 235 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 236 wpabuf_put_be16(msg, ATTR_SSID); 237 wpabuf_put_be16(msg, wps->wps->ssid_len); 238 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 239 return 0; 240} 241 242 243static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 244{ 245 u16 auth_type = wps->wps->auth_types; 246 247 /* Select the best authentication type */ 248 if (auth_type & WPS_AUTH_WPA2PSK) 249 auth_type = WPS_AUTH_WPA2PSK; 250 else if (auth_type & WPS_AUTH_WPAPSK) 251 auth_type = WPS_AUTH_WPAPSK; 252 else if (auth_type & WPS_AUTH_OPEN) 253 auth_type = WPS_AUTH_OPEN; 254 else if (auth_type & WPS_AUTH_SHARED) 255 auth_type = WPS_AUTH_SHARED; 256 257 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 258 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 259 wpabuf_put_be16(msg, 2); 260 wpabuf_put_be16(msg, auth_type); 261 return 0; 262} 263 264 265static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 266{ 267 u16 encr_type = wps->wps->encr_types; 268 269 /* Select the best encryption type */ 270 if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 271 if (encr_type & WPS_ENCR_AES) 272 encr_type = WPS_ENCR_AES; 273 else if (encr_type & WPS_ENCR_TKIP) 274 encr_type = WPS_ENCR_TKIP; 275 } else { 276 if (encr_type & WPS_ENCR_WEP) 277 encr_type = WPS_ENCR_WEP; 278 else if (encr_type & WPS_ENCR_NONE) 279 encr_type = WPS_ENCR_NONE; 280 } 281 282 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 283 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 284 wpabuf_put_be16(msg, 2); 285 wpabuf_put_be16(msg, encr_type); 286 return 0; 287} 288 289 290static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 291{ 292 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 293 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 294 wpabuf_put_be16(msg, wps->wps->network_key_len); 295 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 296 return 0; 297} 298 299 300static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 301{ 302 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 303 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 304 wpabuf_put_be16(msg, ETH_ALEN); 305 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 306 return 0; 307} 308 309 310static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 311{ 312 if (wps->wps->ap_settings) { 313 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 314 wpabuf_put_data(plain, wps->wps->ap_settings, 315 wps->wps->ap_settings_len); 316 return 0; 317 } 318 319 return wps_build_cred_ssid(wps, plain) || 320 wps_build_cred_mac_addr(wps, plain) || 321 wps_build_cred_auth_type(wps, plain) || 322 wps_build_cred_encr_type(wps, plain) || 323 wps_build_cred_network_key(wps, plain); 324} 325 326 327static struct wpabuf * wps_build_m7(struct wps_data *wps) 328{ 329 struct wpabuf *msg, *plain; 330 331 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 332 333 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 334 if (plain == NULL) 335 return NULL; 336 337 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 338 if (msg == NULL) { 339 wpabuf_free(plain); 340 return NULL; 341 } 342 343 if (wps_build_version(msg) || 344 wps_build_msg_type(msg, WPS_M7) || 345 wps_build_registrar_nonce(wps, msg) || 346 wps_build_e_snonce2(wps, plain) || 347 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 348 wps_build_key_wrap_auth(wps, plain) || 349 wps_build_encr_settings(wps, msg, plain) || 350 wps_build_wfa_ext(msg, 0, NULL, 0) || 351 wps_build_authenticator(wps, msg)) { 352 wpabuf_free(plain); 353 wpabuf_free(msg); 354 return NULL; 355 } 356 wpabuf_free(plain); 357 358 if (wps->wps->ap && wps->wps->registrar) { 359 /* 360 * If the Registrar is only learning our current configuration, 361 * it may not continue protocol run to successful completion. 362 * Store information here to make sure it remains available. 363 */ 364 wps_device_store(wps->wps->registrar, &wps->peer_dev, 365 wps->uuid_r); 366 } 367 368 wps->state = RECV_M8; 369 return msg; 370} 371 372 373static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 374{ 375 struct wpabuf *msg; 376 377 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 378 379 msg = wpabuf_alloc(1000); 380 if (msg == NULL) 381 return NULL; 382 383 if (wps_build_version(msg) || 384 wps_build_msg_type(msg, WPS_WSC_DONE) || 385 wps_build_enrollee_nonce(wps, msg) || 386 wps_build_registrar_nonce(wps, msg) || 387 wps_build_wfa_ext(msg, 0, NULL, 0)) { 388 wpabuf_free(msg); 389 return NULL; 390 } 391 392 if (wps->wps->ap) 393 wps->state = RECV_ACK; 394 else { 395 wps_success_event(wps->wps); 396 wps->state = WPS_FINISHED; 397 } 398 return msg; 399} 400 401 402struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 403 enum wsc_op_code *op_code) 404{ 405 struct wpabuf *msg; 406 407 switch (wps->state) { 408 case SEND_M1: 409 msg = wps_build_m1(wps); 410 *op_code = WSC_MSG; 411 break; 412 case SEND_M3: 413 msg = wps_build_m3(wps); 414 *op_code = WSC_MSG; 415 break; 416 case SEND_M5: 417 msg = wps_build_m5(wps); 418 *op_code = WSC_MSG; 419 break; 420 case SEND_M7: 421 msg = wps_build_m7(wps); 422 *op_code = WSC_MSG; 423 break; 424 case RECEIVED_M2D: 425 if (wps->wps->ap) { 426 msg = wps_build_wsc_nack(wps); 427 *op_code = WSC_NACK; 428 break; 429 } 430 msg = wps_build_wsc_ack(wps); 431 *op_code = WSC_ACK; 432 if (msg) { 433 /* Another M2/M2D may be received */ 434 wps->state = RECV_M2; 435 } 436 break; 437 case SEND_WSC_NACK: 438 msg = wps_build_wsc_nack(wps); 439 *op_code = WSC_NACK; 440 break; 441 case WPS_MSG_DONE: 442 msg = wps_build_wsc_done(wps); 443 *op_code = WSC_Done; 444 break; 445 default: 446 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 447 "a message", wps->state); 448 msg = NULL; 449 break; 450 } 451 452 if (*op_code == WSC_MSG && msg) { 453 /* Save a copy of the last message for Authenticator derivation 454 */ 455 wpabuf_free(wps->last_msg); 456 wps->last_msg = wpabuf_dup(msg); 457 } 458 459 return msg; 460} 461 462 463static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 464{ 465 if (r_nonce == NULL) { 466 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 467 return -1; 468 } 469 470 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 471 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 472 wps->nonce_r, WPS_NONCE_LEN); 473 474 return 0; 475} 476 477 478static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 479{ 480 if (e_nonce == NULL) { 481 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 482 return -1; 483 } 484 485 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 486 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 487 return -1; 488 } 489 490 return 0; 491} 492 493 494static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 495{ 496 if (uuid_r == NULL) { 497 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 498 return -1; 499 } 500 501 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 502 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 503 504 return 0; 505} 506 507 508static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 509 size_t pk_len) 510{ 511 if (pk == NULL || pk_len == 0) { 512 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 513 return -1; 514 } 515 516 wpabuf_free(wps->dh_pubkey_r); 517 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 518 if (wps->dh_pubkey_r == NULL) 519 return -1; 520 521 if (wps_derive_keys(wps) < 0) 522 return -1; 523 524 return 0; 525} 526 527 528static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 529{ 530 if (r_hash1 == NULL) { 531 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 532 return -1; 533 } 534 535 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 536 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 537 538 return 0; 539} 540 541 542static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 543{ 544 if (r_hash2 == NULL) { 545 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 546 return -1; 547 } 548 549 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 550 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 551 552 return 0; 553} 554 555 556static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 557{ 558 u8 hash[SHA256_MAC_LEN]; 559 const u8 *addr[4]; 560 size_t len[4]; 561 562 if (r_snonce1 == NULL) { 563 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 564 return -1; 565 } 566 567 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 568 WPS_SECRET_NONCE_LEN); 569 570 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 571 addr[0] = r_snonce1; 572 len[0] = WPS_SECRET_NONCE_LEN; 573 addr[1] = wps->psk1; 574 len[1] = WPS_PSK_LEN; 575 addr[2] = wpabuf_head(wps->dh_pubkey_e); 576 len[2] = wpabuf_len(wps->dh_pubkey_e); 577 addr[3] = wpabuf_head(wps->dh_pubkey_r); 578 len[3] = wpabuf_len(wps->dh_pubkey_r); 579 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 580 581 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 582 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 583 "not match with the pre-committed value"); 584 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 585 wps_pwd_auth_fail_event(wps->wps, 1, 1); 586 return -1; 587 } 588 589 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 590 "half of the device password"); 591 592 return 0; 593} 594 595 596static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 597{ 598 u8 hash[SHA256_MAC_LEN]; 599 const u8 *addr[4]; 600 size_t len[4]; 601 602 if (r_snonce2 == NULL) { 603 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 604 return -1; 605 } 606 607 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 608 WPS_SECRET_NONCE_LEN); 609 610 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 611 addr[0] = r_snonce2; 612 len[0] = WPS_SECRET_NONCE_LEN; 613 addr[1] = wps->psk2; 614 len[1] = WPS_PSK_LEN; 615 addr[2] = wpabuf_head(wps->dh_pubkey_e); 616 len[2] = wpabuf_len(wps->dh_pubkey_e); 617 addr[3] = wpabuf_head(wps->dh_pubkey_r); 618 len[3] = wpabuf_len(wps->dh_pubkey_r); 619 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 620 621 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 622 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 623 "not match with the pre-committed value"); 624 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 625 wps_pwd_auth_fail_event(wps->wps, 1, 2); 626 return -1; 627 } 628 629 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 630 "half of the device password"); 631 632 return 0; 633} 634 635 636static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 637 size_t cred_len, int wps2) 638{ 639 struct wps_parse_attr attr; 640 struct wpabuf msg; 641 int ret = 0; 642 643 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 644 os_memset(&wps->cred, 0, sizeof(wps->cred)); 645 wpabuf_set(&msg, cred, cred_len); 646 if (wps_parse_msg(&msg, &attr) < 0 || 647 wps_process_cred(&attr, &wps->cred)) 648 return -1; 649 650 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 651 0) { 652 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 653 MACSTR ") does not match with own address (" MACSTR 654 ")", MAC2STR(wps->cred.mac_addr), 655 MAC2STR(wps->wps->dev.mac_addr)); 656 /* 657 * In theory, this could be consider fatal error, but there are 658 * number of deployed implementations using other address here 659 * due to unclarity in the specification. For interoperability 660 * reasons, allow this to be processed since we do not really 661 * use the MAC Address information for anything. 662 */ 663#ifdef CONFIG_WPS_STRICT 664 if (wps2) { 665 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 666 "MAC Address in AP Settings"); 667 return -1; 668 } 669#endif /* CONFIG_WPS_STRICT */ 670 } 671 672#ifdef CONFIG_WPS2 673 if (!(wps->cred.encr_type & 674 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 675 if (wps->cred.encr_type & WPS_ENCR_WEP) { 676 wpa_printf(MSG_INFO, "WPS: Reject Credential " 677 "due to WEP configuration"); 678 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 679 return -2; 680 } 681 682 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 683 "invalid encr_type 0x%x", wps->cred.encr_type); 684 return -1; 685 } 686#endif /* CONFIG_WPS2 */ 687 688 if (wps->wps->cred_cb) { 689 wps->cred.cred_attr = cred - 4; 690 wps->cred.cred_attr_len = cred_len + 4; 691 ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 692 wps->cred.cred_attr = NULL; 693 wps->cred.cred_attr_len = 0; 694 } 695 696 return ret; 697} 698 699 700static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 701 size_t cred_len[], size_t num_cred, int wps2) 702{ 703 size_t i; 704 int ok = 0; 705 706 if (wps->wps->ap) 707 return 0; 708 709 if (num_cred == 0) { 710 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 711 "received"); 712 return -1; 713 } 714 715 for (i = 0; i < num_cred; i++) { 716 int res; 717 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 718 if (res == 0) 719 ok++; 720 else if (res == -2) 721 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 722 else 723 return -1; 724 } 725 726 if (ok == 0) { 727 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 728 "received"); 729 return -1; 730 } 731 732 return 0; 733} 734 735 736static int wps_process_ap_settings_e(struct wps_data *wps, 737 struct wps_parse_attr *attr, 738 struct wpabuf *attrs, int wps2) 739{ 740 struct wps_credential cred; 741 742 if (!wps->wps->ap) 743 return 0; 744 745 if (wps_process_ap_settings(attr, &cred) < 0) 746 return -1; 747 748 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 749 "Registrar"); 750 751 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 752 0) { 753 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 754 MACSTR ") does not match with own address (" MACSTR 755 ")", MAC2STR(cred.mac_addr), 756 MAC2STR(wps->wps->dev.mac_addr)); 757 /* 758 * In theory, this could be consider fatal error, but there are 759 * number of deployed implementations using other address here 760 * due to unclarity in the specification. For interoperability 761 * reasons, allow this to be processed since we do not really 762 * use the MAC Address information for anything. 763 */ 764#ifdef CONFIG_WPS_STRICT 765 if (wps2) { 766 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 767 "MAC Address in AP Settings"); 768 return -1; 769 } 770#endif /* CONFIG_WPS_STRICT */ 771 } 772 773#ifdef CONFIG_WPS2 774 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 775 { 776 if (cred.encr_type & WPS_ENCR_WEP) { 777 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 778 "due to WEP configuration"); 779 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 780 return -1; 781 } 782 783 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 784 "invalid encr_type 0x%x", cred.encr_type); 785 return -1; 786 } 787#endif /* CONFIG_WPS2 */ 788 789#ifdef CONFIG_WPS_STRICT 790 if (wps2) { 791 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 792 WPS_ENCR_TKIP || 793 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 794 WPS_AUTH_WPAPSK) { 795 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 796 "AP Settings: WPA-Personal/TKIP only"); 797 wps->error_indication = 798 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 799 return -1; 800 } 801 } 802#endif /* CONFIG_WPS_STRICT */ 803 804#ifdef CONFIG_WPS2 805 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 806 { 807 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 808 "TKIP+AES"); 809 cred.encr_type |= WPS_ENCR_AES; 810 } 811 812 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 813 WPS_AUTH_WPAPSK) { 814 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 815 "WPAPSK+WPA2PSK"); 816 cred.auth_type |= WPS_AUTH_WPA2PSK; 817 } 818#endif /* CONFIG_WPS2 */ 819 820 if (wps->wps->cred_cb) { 821 cred.cred_attr = wpabuf_head(attrs); 822 cred.cred_attr_len = wpabuf_len(attrs); 823 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 824 } 825 826 return 0; 827} 828 829 830static int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 831{ 832 u16 id; 833 834 if (dev_pw_id == NULL) { 835 wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 836 return -1; 837 } 838 839 id = WPA_GET_BE16(dev_pw_id); 840 if (wps->dev_pw_id == id) { 841 wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 842 return 0; 843 } 844 845#ifdef CONFIG_P2P 846 if ((id == DEV_PW_DEFAULT && 847 wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 848 (id == DEV_PW_REGISTRAR_SPECIFIED && 849 wps->dev_pw_id == DEV_PW_DEFAULT)) { 850 /* 851 * Common P2P use cases indicate whether the PIN is from the 852 * client or GO using Device Password Id in M1/M2 in a way that 853 * does not look fully compliant with WSC specification. Anyway, 854 * this is deployed and needs to be allowed, so ignore changes 855 * between Registrar-Specified and Default PIN. 856 */ 857 wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 858 "change"); 859 return 0; 860 } 861#endif /* CONFIG_P2P */ 862 863 wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 864 "ID from %u to %u", wps->dev_pw_id, id); 865 866 if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 867 wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 868 os_free(wps->dev_password); 869 wps->dev_pw_id = wps->alt_dev_pw_id; 870 wps->dev_password = wps->alt_dev_password; 871 wps->dev_password_len = wps->alt_dev_password_len; 872 wps->alt_dev_password = NULL; 873 wps->alt_dev_password_len = 0; 874 return 0; 875 } 876 877 return -1; 878} 879 880 881static enum wps_process_res wps_process_m2(struct wps_data *wps, 882 const struct wpabuf *msg, 883 struct wps_parse_attr *attr) 884{ 885 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 886 887 if (wps->state != RECV_M2) { 888 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 889 "receiving M2", wps->state); 890 wps->state = SEND_WSC_NACK; 891 return WPS_CONTINUE; 892 } 893 894 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 895 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 896 wps_process_uuid_r(wps, attr->uuid_r) || 897 wps_process_dev_pw_id(wps, attr->dev_password_id)) { 898 wps->state = SEND_WSC_NACK; 899 return WPS_CONTINUE; 900 } 901 902 /* 903 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 904 * special locked mode is used to allow protocol run up to M7 in order 905 * to support external Registrars that only learn the current AP 906 * configuration without changing it. 907 */ 908 if (wps->wps->ap && 909 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 910 wps->dev_password == NULL)) { 911 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 912 "registration of a new Registrar"); 913 wps->config_error = WPS_CFG_SETUP_LOCKED; 914 wps->state = SEND_WSC_NACK; 915 return WPS_CONTINUE; 916 } 917 918 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 919 wps_process_authenticator(wps, attr->authenticator, msg) || 920 wps_process_device_attrs(&wps->peer_dev, attr)) { 921 wps->state = SEND_WSC_NACK; 922 return WPS_CONTINUE; 923 } 924 925 wps->state = SEND_M3; 926 return WPS_CONTINUE; 927} 928 929 930static enum wps_process_res wps_process_m2d(struct wps_data *wps, 931 struct wps_parse_attr *attr) 932{ 933 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 934 935 if (wps->state != RECV_M2) { 936 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 937 "receiving M2D", wps->state); 938 wps->state = SEND_WSC_NACK; 939 return WPS_CONTINUE; 940 } 941 942 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 943 attr->manufacturer, attr->manufacturer_len); 944 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 945 attr->model_name, attr->model_name_len); 946 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 947 attr->model_number, attr->model_number_len); 948 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 949 attr->serial_number, attr->serial_number_len); 950 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 951 attr->dev_name, attr->dev_name_len); 952 953 if (wps->wps->event_cb) { 954 union wps_event_data data; 955 struct wps_event_m2d *m2d = &data.m2d; 956 os_memset(&data, 0, sizeof(data)); 957 if (attr->config_methods) 958 m2d->config_methods = 959 WPA_GET_BE16(attr->config_methods); 960 m2d->manufacturer = attr->manufacturer; 961 m2d->manufacturer_len = attr->manufacturer_len; 962 m2d->model_name = attr->model_name; 963 m2d->model_name_len = attr->model_name_len; 964 m2d->model_number = attr->model_number; 965 m2d->model_number_len = attr->model_number_len; 966 m2d->serial_number = attr->serial_number; 967 m2d->serial_number_len = attr->serial_number_len; 968 m2d->dev_name = attr->dev_name; 969 m2d->dev_name_len = attr->dev_name_len; 970 m2d->primary_dev_type = attr->primary_dev_type; 971 if (attr->config_error) 972 m2d->config_error = 973 WPA_GET_BE16(attr->config_error); 974 if (attr->dev_password_id) 975 m2d->dev_password_id = 976 WPA_GET_BE16(attr->dev_password_id); 977 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 978 } 979 980 wps->state = RECEIVED_M2D; 981 return WPS_CONTINUE; 982} 983 984 985static enum wps_process_res wps_process_m4(struct wps_data *wps, 986 const struct wpabuf *msg, 987 struct wps_parse_attr *attr) 988{ 989 struct wpabuf *decrypted; 990 struct wps_parse_attr eattr; 991 992 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 993 994 if (wps->state != RECV_M4) { 995 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 996 "receiving M4", wps->state); 997 wps->state = SEND_WSC_NACK; 998 return WPS_CONTINUE; 999 } 1000 1001 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1002 wps_process_authenticator(wps, attr->authenticator, msg) || 1003 wps_process_r_hash1(wps, attr->r_hash1) || 1004 wps_process_r_hash2(wps, attr->r_hash2)) { 1005 wps->state = SEND_WSC_NACK; 1006 return WPS_CONTINUE; 1007 } 1008 1009 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1010 attr->encr_settings_len); 1011 if (decrypted == NULL) { 1012 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1013 "Settings attribute"); 1014 wps->state = SEND_WSC_NACK; 1015 return WPS_CONTINUE; 1016 } 1017 1018 if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1019 wpabuf_free(decrypted); 1020 wps->state = SEND_WSC_NACK; 1021 return WPS_CONTINUE; 1022 } 1023 1024 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1025 "attribute"); 1026 if (wps_parse_msg(decrypted, &eattr) < 0 || 1027 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1028 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1029 wpabuf_free(decrypted); 1030 wps->state = SEND_WSC_NACK; 1031 return WPS_CONTINUE; 1032 } 1033 wpabuf_free(decrypted); 1034 1035 wps->state = SEND_M5; 1036 return WPS_CONTINUE; 1037} 1038 1039 1040static enum wps_process_res wps_process_m6(struct wps_data *wps, 1041 const struct wpabuf *msg, 1042 struct wps_parse_attr *attr) 1043{ 1044 struct wpabuf *decrypted; 1045 struct wps_parse_attr eattr; 1046 1047 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1048 1049 if (wps->state != RECV_M6) { 1050 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1051 "receiving M6", wps->state); 1052 wps->state = SEND_WSC_NACK; 1053 return WPS_CONTINUE; 1054 } 1055 1056 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1057 wps_process_authenticator(wps, attr->authenticator, msg)) { 1058 wps->state = SEND_WSC_NACK; 1059 return WPS_CONTINUE; 1060 } 1061 1062 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1063 attr->encr_settings_len); 1064 if (decrypted == NULL) { 1065 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1066 "Settings attribute"); 1067 wps->state = SEND_WSC_NACK; 1068 return WPS_CONTINUE; 1069 } 1070 1071 if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1072 wpabuf_free(decrypted); 1073 wps->state = SEND_WSC_NACK; 1074 return WPS_CONTINUE; 1075 } 1076 1077 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1078 "attribute"); 1079 if (wps_parse_msg(decrypted, &eattr) < 0 || 1080 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1081 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1082 wpabuf_free(decrypted); 1083 wps->state = SEND_WSC_NACK; 1084 return WPS_CONTINUE; 1085 } 1086 wpabuf_free(decrypted); 1087 1088 if (wps->wps->ap) 1089 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1090 NULL); 1091 1092 wps->state = SEND_M7; 1093 return WPS_CONTINUE; 1094} 1095 1096 1097static enum wps_process_res wps_process_m8(struct wps_data *wps, 1098 const struct wpabuf *msg, 1099 struct wps_parse_attr *attr) 1100{ 1101 struct wpabuf *decrypted; 1102 struct wps_parse_attr eattr; 1103 1104 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1105 1106 if (wps->state != RECV_M8) { 1107 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1108 "receiving M8", wps->state); 1109 wps->state = SEND_WSC_NACK; 1110 return WPS_CONTINUE; 1111 } 1112 1113 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1114 wps_process_authenticator(wps, attr->authenticator, msg)) { 1115 wps->state = SEND_WSC_NACK; 1116 return WPS_CONTINUE; 1117 } 1118 1119 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1120 /* 1121 * Stop here if special ap_setup_locked == 2 mode allowed the 1122 * protocol to continue beyond M2. This allows ER to learn the 1123 * current AP settings without changing them. 1124 */ 1125 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1126 "registration of a new Registrar"); 1127 wps->config_error = WPS_CFG_SETUP_LOCKED; 1128 wps->state = SEND_WSC_NACK; 1129 return WPS_CONTINUE; 1130 } 1131 1132 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1133 attr->encr_settings_len); 1134 if (decrypted == NULL) { 1135 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1136 "Settings attribute"); 1137 wps->state = SEND_WSC_NACK; 1138 return WPS_CONTINUE; 1139 } 1140 1141 if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1142 attr->version2 != NULL) < 0) { 1143 wpabuf_free(decrypted); 1144 wps->state = SEND_WSC_NACK; 1145 return WPS_CONTINUE; 1146 } 1147 1148 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1149 "attribute"); 1150 if (wps_parse_msg(decrypted, &eattr) < 0 || 1151 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1152 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1153 eattr.num_cred, attr->version2 != NULL) || 1154 wps_process_ap_settings_e(wps, &eattr, decrypted, 1155 attr->version2 != NULL)) { 1156 wpabuf_free(decrypted); 1157 wps->state = SEND_WSC_NACK; 1158 return WPS_CONTINUE; 1159 } 1160 wpabuf_free(decrypted); 1161 1162 wps->state = WPS_MSG_DONE; 1163 return WPS_CONTINUE; 1164} 1165 1166 1167static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1168 const struct wpabuf *msg) 1169{ 1170 struct wps_parse_attr attr; 1171 enum wps_process_res ret = WPS_CONTINUE; 1172 1173 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1174 1175 if (wps_parse_msg(msg, &attr) < 0) 1176 return WPS_FAILURE; 1177 1178 if (attr.enrollee_nonce == NULL || 1179 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1180 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1181 return WPS_FAILURE; 1182 } 1183 1184 if (attr.msg_type == NULL) { 1185 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1186 wps->state = SEND_WSC_NACK; 1187 return WPS_CONTINUE; 1188 } 1189 1190 switch (*attr.msg_type) { 1191 case WPS_M2: 1192 if (wps_validate_m2(msg) < 0) 1193 return WPS_FAILURE; 1194 ret = wps_process_m2(wps, msg, &attr); 1195 break; 1196 case WPS_M2D: 1197 if (wps_validate_m2d(msg) < 0) 1198 return WPS_FAILURE; 1199 ret = wps_process_m2d(wps, &attr); 1200 break; 1201 case WPS_M4: 1202 if (wps_validate_m4(msg) < 0) 1203 return WPS_FAILURE; 1204 ret = wps_process_m4(wps, msg, &attr); 1205 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1206 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1207 wps->error_indication); 1208 break; 1209 case WPS_M6: 1210 if (wps_validate_m6(msg) < 0) 1211 return WPS_FAILURE; 1212 ret = wps_process_m6(wps, msg, &attr); 1213 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1214 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1215 wps->error_indication); 1216 break; 1217 case WPS_M8: 1218 if (wps_validate_m8(msg) < 0) 1219 return WPS_FAILURE; 1220 ret = wps_process_m8(wps, msg, &attr); 1221 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1222 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1223 wps->error_indication); 1224 break; 1225 default: 1226 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1227 *attr.msg_type); 1228 return WPS_FAILURE; 1229 } 1230 1231 /* 1232 * Save a copy of the last message for Authenticator derivation if we 1233 * are continuing. However, skip M2D since it is not authenticated and 1234 * neither is the ACK/NACK response frame. This allows the possibly 1235 * following M2 to be processed correctly by using the previously sent 1236 * M1 in Authenticator derivation. 1237 */ 1238 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1239 /* Save a copy of the last message for Authenticator derivation 1240 */ 1241 wpabuf_free(wps->last_msg); 1242 wps->last_msg = wpabuf_dup(msg); 1243 } 1244 1245 return ret; 1246} 1247 1248 1249static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1250 const struct wpabuf *msg) 1251{ 1252 struct wps_parse_attr attr; 1253 1254 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1255 1256 if (wps_parse_msg(msg, &attr) < 0) 1257 return WPS_FAILURE; 1258 1259 if (attr.msg_type == NULL) { 1260 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1261 return WPS_FAILURE; 1262 } 1263 1264 if (*attr.msg_type != WPS_WSC_ACK) { 1265 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1266 *attr.msg_type); 1267 return WPS_FAILURE; 1268 } 1269 1270 if (attr.registrar_nonce == NULL || 1271 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1272 { 1273 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1274 return WPS_FAILURE; 1275 } 1276 1277 if (attr.enrollee_nonce == NULL || 1278 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1279 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1280 return WPS_FAILURE; 1281 } 1282 1283 if (wps->state == RECV_ACK && wps->wps->ap) { 1284 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1285 "completed successfully"); 1286 wps_success_event(wps->wps); 1287 wps->state = WPS_FINISHED; 1288 return WPS_DONE; 1289 } 1290 1291 return WPS_FAILURE; 1292} 1293 1294 1295static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1296 const struct wpabuf *msg) 1297{ 1298 struct wps_parse_attr attr; 1299 u16 config_error; 1300 1301 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1302 1303 if (wps_parse_msg(msg, &attr) < 0) 1304 return WPS_FAILURE; 1305 1306 if (attr.msg_type == NULL) { 1307 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1308 return WPS_FAILURE; 1309 } 1310 1311 if (*attr.msg_type != WPS_WSC_NACK) { 1312 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1313 *attr.msg_type); 1314 return WPS_FAILURE; 1315 } 1316 1317 if (attr.registrar_nonce == NULL || 1318 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1319 { 1320 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1321 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1322 attr.registrar_nonce, WPS_NONCE_LEN); 1323 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1324 wps->nonce_r, WPS_NONCE_LEN); 1325 return WPS_FAILURE; 1326 } 1327 1328 if (attr.enrollee_nonce == NULL || 1329 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1330 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1331 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1332 attr.enrollee_nonce, WPS_NONCE_LEN); 1333 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1334 wps->nonce_e, WPS_NONCE_LEN); 1335 return WPS_FAILURE; 1336 } 1337 1338 if (attr.config_error == NULL) { 1339 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1340 "in WSC_NACK"); 1341 return WPS_FAILURE; 1342 } 1343 1344 config_error = WPA_GET_BE16(attr.config_error); 1345 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1346 "Configuration Error %d", config_error); 1347 1348 switch (wps->state) { 1349 case RECV_M4: 1350 wps_fail_event(wps->wps, WPS_M3, config_error, 1351 wps->error_indication); 1352 break; 1353 case RECV_M6: 1354 wps_fail_event(wps->wps, WPS_M5, config_error, 1355 wps->error_indication); 1356 break; 1357 case RECV_M8: 1358 wps_fail_event(wps->wps, WPS_M7, config_error, 1359 wps->error_indication); 1360 break; 1361 default: 1362 break; 1363 } 1364 1365 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1366 * Enrollee is Authenticator */ 1367 wps->state = SEND_WSC_NACK; 1368 1369 return WPS_FAILURE; 1370} 1371 1372 1373enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1374 enum wsc_op_code op_code, 1375 const struct wpabuf *msg) 1376{ 1377 1378 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1379 "op_code=%d)", 1380 (unsigned long) wpabuf_len(msg), op_code); 1381 1382 if (op_code == WSC_UPnP) { 1383 /* Determine the OpCode based on message type attribute */ 1384 struct wps_parse_attr attr; 1385 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1386 if (*attr.msg_type == WPS_WSC_ACK) 1387 op_code = WSC_ACK; 1388 else if (*attr.msg_type == WPS_WSC_NACK) 1389 op_code = WSC_NACK; 1390 } 1391 } 1392 1393 switch (op_code) { 1394 case WSC_MSG: 1395 case WSC_UPnP: 1396 return wps_process_wsc_msg(wps, msg); 1397 case WSC_ACK: 1398 if (wps_validate_wsc_ack(msg) < 0) 1399 return WPS_FAILURE; 1400 return wps_process_wsc_ack(wps, msg); 1401 case WSC_NACK: 1402 if (wps_validate_wsc_nack(msg) < 0) 1403 return WPS_FAILURE; 1404 return wps_process_wsc_nack(wps, msg); 1405 default: 1406 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1407 return WPS_FAILURE; 1408 } 1409} 1410