1189251Ssam/* 2189251Ssam * Wi-Fi Protected Setup - Enrollee 3189251Ssam * Copyright (c) 2008, Jouni Malinen <j@w1.fi> 4189251Ssam * 5252726Srpaulo * This software may be distributed under the terms of the BSD license. 6252726Srpaulo * See README for more details. 7189251Ssam */ 8189251Ssam 9189251Ssam#include "includes.h" 10189251Ssam 11189251Ssam#include "common.h" 12214734Srpaulo#include "crypto/crypto.h" 13214734Srpaulo#include "crypto/sha256.h" 14252726Srpaulo#include "crypto/random.h" 15189251Ssam#include "wps_i.h" 16189251Ssam#include "wps_dev_attr.h" 17189251Ssam 18189251Ssam 19189251Ssamstatic int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 20189251Ssam{ 21189251Ssam u8 state; 22189251Ssam if (wps->wps->ap) 23189251Ssam state = wps->wps->wps_state; 24189251Ssam else 25189251Ssam state = WPS_STATE_NOT_CONFIGURED; 26189251Ssam wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 27189251Ssam state); 28189251Ssam wpabuf_put_be16(msg, ATTR_WPS_STATE); 29189251Ssam wpabuf_put_be16(msg, 1); 30209158Srpaulo wpabuf_put_u8(msg, state); 31189251Ssam return 0; 32189251Ssam} 33189251Ssam 34189251Ssam 35189251Ssamstatic int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 36189251Ssam{ 37189251Ssam u8 *hash; 38189251Ssam const u8 *addr[4]; 39189251Ssam size_t len[4]; 40189251Ssam 41252726Srpaulo if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 42189251Ssam return -1; 43189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 44189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 45189251Ssam wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 46189251Ssam 47189251Ssam if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 48189251Ssam wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 49189251Ssam "E-Hash derivation"); 50189251Ssam return -1; 51189251Ssam } 52189251Ssam 53189251Ssam wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 54189251Ssam wpabuf_put_be16(msg, ATTR_E_HASH1); 55189251Ssam wpabuf_put_be16(msg, SHA256_MAC_LEN); 56189251Ssam hash = wpabuf_put(msg, SHA256_MAC_LEN); 57189251Ssam /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 58189251Ssam addr[0] = wps->snonce; 59189251Ssam len[0] = WPS_SECRET_NONCE_LEN; 60189251Ssam addr[1] = wps->psk1; 61189251Ssam len[1] = WPS_PSK_LEN; 62189251Ssam addr[2] = wpabuf_head(wps->dh_pubkey_e); 63189251Ssam len[2] = wpabuf_len(wps->dh_pubkey_e); 64189251Ssam addr[3] = wpabuf_head(wps->dh_pubkey_r); 65189251Ssam len[3] = wpabuf_len(wps->dh_pubkey_r); 66189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 67189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 68189251Ssam 69189251Ssam wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 70189251Ssam wpabuf_put_be16(msg, ATTR_E_HASH2); 71189251Ssam wpabuf_put_be16(msg, SHA256_MAC_LEN); 72189251Ssam hash = wpabuf_put(msg, SHA256_MAC_LEN); 73189251Ssam /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 74189251Ssam addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 75189251Ssam addr[1] = wps->psk2; 76189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 77189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 78189251Ssam 79189251Ssam return 0; 80189251Ssam} 81189251Ssam 82189251Ssam 83189251Ssamstatic int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 84189251Ssam{ 85189251Ssam wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 86189251Ssam wpabuf_put_be16(msg, ATTR_E_SNONCE1); 87189251Ssam wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 88189251Ssam wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 89189251Ssam return 0; 90189251Ssam} 91189251Ssam 92189251Ssam 93189251Ssamstatic int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 94189251Ssam{ 95189251Ssam wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 96189251Ssam wpabuf_put_be16(msg, ATTR_E_SNONCE2); 97189251Ssam wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 98189251Ssam wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 99189251Ssam WPS_SECRET_NONCE_LEN); 100189251Ssam return 0; 101189251Ssam} 102189251Ssam 103189251Ssam 104189251Ssamstatic struct wpabuf * wps_build_m1(struct wps_data *wps) 105189251Ssam{ 106189251Ssam struct wpabuf *msg; 107252726Srpaulo u16 config_methods; 108346981Scy u8 multi_ap_backhaul_sta = 0; 109189251Ssam 110252726Srpaulo if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 111189251Ssam return NULL; 112189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 113189251Ssam wps->nonce_e, WPS_NONCE_LEN); 114189251Ssam 115189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 116189251Ssam msg = wpabuf_alloc(1000); 117189251Ssam if (msg == NULL) 118189251Ssam return NULL; 119189251Ssam 120252726Srpaulo config_methods = wps->wps->config_methods; 121252726Srpaulo if (wps->wps->ap && !wps->pbc_in_m1 && 122252726Srpaulo (wps->dev_password_len != 0 || 123252726Srpaulo (config_methods & WPS_CONFIG_DISPLAY))) { 124252726Srpaulo /* 125252726Srpaulo * These are the methods that the AP supports as an Enrollee 126252726Srpaulo * for adding external Registrars, so remove PushButton. 127252726Srpaulo * 128252726Srpaulo * As a workaround for Windows 7 mechanism for probing WPS 129252726Srpaulo * capabilities from M1, leave PushButton option if no PIN 130252726Srpaulo * method is available or if WPS configuration enables PBC 131252726Srpaulo * workaround. 132252726Srpaulo */ 133252726Srpaulo config_methods &= ~WPS_CONFIG_PUSHBUTTON; 134252726Srpaulo config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 135252726Srpaulo WPS_CONFIG_PHY_PUSHBUTTON); 136252726Srpaulo } 137252726Srpaulo 138346981Scy if (wps->multi_ap_backhaul_sta) 139346981Scy multi_ap_backhaul_sta = MULTI_AP_BACKHAUL_STA; 140346981Scy 141189251Ssam if (wps_build_version(msg) || 142189251Ssam wps_build_msg_type(msg, WPS_M1) || 143189251Ssam wps_build_uuid_e(msg, wps->uuid_e) || 144281806Srpaulo wps_build_mac_addr(msg, wps->mac_addr_e) || 145189251Ssam wps_build_enrollee_nonce(wps, msg) || 146189251Ssam wps_build_public_key(wps, msg) || 147189251Ssam wps_build_auth_type_flags(wps, msg) || 148189251Ssam wps_build_encr_type_flags(wps, msg) || 149189251Ssam wps_build_conn_type_flags(wps, msg) || 150252726Srpaulo wps_build_config_methods(msg, config_methods) || 151189251Ssam wps_build_wps_state(wps, msg) || 152189251Ssam wps_build_device_attrs(&wps->wps->dev, msg) || 153281806Srpaulo wps_build_rf_bands(&wps->wps->dev, msg, 154281806Srpaulo wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 155189251Ssam wps_build_assoc_state(wps, msg) || 156189251Ssam wps_build_dev_password_id(msg, wps->dev_pw_id) || 157189251Ssam wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 158252726Srpaulo wps_build_os_version(&wps->wps->dev, msg) || 159346981Scy wps_build_wfa_ext(msg, 0, NULL, 0, multi_ap_backhaul_sta) || 160252726Srpaulo wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 161189251Ssam wpabuf_free(msg); 162189251Ssam return NULL; 163189251Ssam } 164189251Ssam 165189251Ssam wps->state = RECV_M2; 166189251Ssam return msg; 167189251Ssam} 168189251Ssam 169189251Ssam 170189251Ssamstatic struct wpabuf * wps_build_m3(struct wps_data *wps) 171189251Ssam{ 172189251Ssam struct wpabuf *msg; 173189251Ssam 174189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 175189251Ssam 176189251Ssam if (wps->dev_password == NULL) { 177189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 178189251Ssam return NULL; 179189251Ssam } 180337817Scy if (wps_derive_psk(wps, wps->dev_password, wps->dev_password_len) < 0) 181337817Scy return NULL; 182189251Ssam 183281806Srpaulo if (wps->wps->ap && random_pool_ready() != 1) { 184281806Srpaulo wpa_printf(MSG_INFO, 185281806Srpaulo "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); 186281806Srpaulo return NULL; 187281806Srpaulo } 188281806Srpaulo 189189251Ssam msg = wpabuf_alloc(1000); 190189251Ssam if (msg == NULL) 191189251Ssam return NULL; 192189251Ssam 193189251Ssam if (wps_build_version(msg) || 194189251Ssam wps_build_msg_type(msg, WPS_M3) || 195189251Ssam wps_build_registrar_nonce(wps, msg) || 196189251Ssam wps_build_e_hash(wps, msg) || 197346981Scy wps_build_wfa_ext(msg, 0, NULL, 0, 0) || 198189251Ssam wps_build_authenticator(wps, msg)) { 199189251Ssam wpabuf_free(msg); 200189251Ssam return NULL; 201189251Ssam } 202189251Ssam 203189251Ssam wps->state = RECV_M4; 204189251Ssam return msg; 205189251Ssam} 206189251Ssam 207189251Ssam 208189251Ssamstatic struct wpabuf * wps_build_m5(struct wps_data *wps) 209189251Ssam{ 210189251Ssam struct wpabuf *msg, *plain; 211189251Ssam 212189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 213189251Ssam 214189251Ssam plain = wpabuf_alloc(200); 215189251Ssam if (plain == NULL) 216189251Ssam return NULL; 217189251Ssam 218189251Ssam msg = wpabuf_alloc(1000); 219189251Ssam if (msg == NULL) { 220189251Ssam wpabuf_free(plain); 221189251Ssam return NULL; 222189251Ssam } 223189251Ssam 224189251Ssam if (wps_build_version(msg) || 225189251Ssam wps_build_msg_type(msg, WPS_M5) || 226189251Ssam wps_build_registrar_nonce(wps, msg) || 227189251Ssam wps_build_e_snonce1(wps, plain) || 228189251Ssam wps_build_key_wrap_auth(wps, plain) || 229189251Ssam wps_build_encr_settings(wps, msg, plain) || 230346981Scy wps_build_wfa_ext(msg, 0, NULL, 0, 0) || 231189251Ssam wps_build_authenticator(wps, msg)) { 232337817Scy wpabuf_clear_free(plain); 233189251Ssam wpabuf_free(msg); 234189251Ssam return NULL; 235189251Ssam } 236337817Scy wpabuf_clear_free(plain); 237189251Ssam 238189251Ssam wps->state = RECV_M6; 239189251Ssam return msg; 240189251Ssam} 241189251Ssam 242189251Ssam 243189251Ssamstatic int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 244189251Ssam{ 245189251Ssam wpa_printf(MSG_DEBUG, "WPS: * SSID"); 246189251Ssam wpabuf_put_be16(msg, ATTR_SSID); 247189251Ssam wpabuf_put_be16(msg, wps->wps->ssid_len); 248189251Ssam wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 249189251Ssam return 0; 250189251Ssam} 251189251Ssam 252189251Ssam 253189251Ssamstatic int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 254189251Ssam{ 255281806Srpaulo u16 auth_type = wps->wps->ap_auth_type; 256252726Srpaulo 257281806Srpaulo /* 258281806Srpaulo * Work around issues with Windows 7 WPS implementation not liking 259281806Srpaulo * multiple Authentication Type bits in M7 AP Settings attribute by 260281806Srpaulo * showing only the most secure option from current configuration. 261281806Srpaulo */ 262252726Srpaulo if (auth_type & WPS_AUTH_WPA2PSK) 263252726Srpaulo auth_type = WPS_AUTH_WPA2PSK; 264252726Srpaulo else if (auth_type & WPS_AUTH_WPAPSK) 265252726Srpaulo auth_type = WPS_AUTH_WPAPSK; 266252726Srpaulo else if (auth_type & WPS_AUTH_OPEN) 267252726Srpaulo auth_type = WPS_AUTH_OPEN; 268252726Srpaulo 269252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 270189251Ssam wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 271189251Ssam wpabuf_put_be16(msg, 2); 272252726Srpaulo wpabuf_put_be16(msg, auth_type); 273189251Ssam return 0; 274189251Ssam} 275189251Ssam 276189251Ssam 277189251Ssamstatic int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 278189251Ssam{ 279281806Srpaulo u16 encr_type = wps->wps->ap_encr_type; 280252726Srpaulo 281281806Srpaulo /* 282281806Srpaulo * Work around issues with Windows 7 WPS implementation not liking 283281806Srpaulo * multiple Encryption Type bits in M7 AP Settings attribute by 284281806Srpaulo * showing only the most secure option from current configuration. 285281806Srpaulo */ 286281806Srpaulo if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 287252726Srpaulo if (encr_type & WPS_ENCR_AES) 288252726Srpaulo encr_type = WPS_ENCR_AES; 289252726Srpaulo else if (encr_type & WPS_ENCR_TKIP) 290252726Srpaulo encr_type = WPS_ENCR_TKIP; 291252726Srpaulo } 292252726Srpaulo 293252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 294189251Ssam wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 295189251Ssam wpabuf_put_be16(msg, 2); 296252726Srpaulo wpabuf_put_be16(msg, encr_type); 297189251Ssam return 0; 298189251Ssam} 299189251Ssam 300189251Ssam 301189251Ssamstatic int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 302189251Ssam{ 303281806Srpaulo if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 304281806Srpaulo wps->wps->network_key_len == 0) { 305281806Srpaulo char hex[65]; 306281806Srpaulo u8 psk[32]; 307281806Srpaulo /* Generate a random per-device PSK */ 308281806Srpaulo if (random_pool_ready() != 1 || 309281806Srpaulo random_get_bytes(psk, sizeof(psk)) < 0) { 310281806Srpaulo wpa_printf(MSG_INFO, 311281806Srpaulo "WPS: Could not generate random PSK"); 312281806Srpaulo return -1; 313281806Srpaulo } 314281806Srpaulo wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 315281806Srpaulo psk, sizeof(psk)); 316281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 317281806Srpaulo (unsigned int) wps->new_psk_len * 2); 318281806Srpaulo wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 319281806Srpaulo wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 320281806Srpaulo wpabuf_put_be16(msg, sizeof(psk) * 2); 321281806Srpaulo wpabuf_put_data(msg, hex, sizeof(psk) * 2); 322281806Srpaulo if (wps->wps->registrar) { 323281806Srpaulo wps_cb_new_psk(wps->wps->registrar, 324281806Srpaulo wps->peer_dev.mac_addr, 325281806Srpaulo wps->p2p_dev_addr, psk, sizeof(psk)); 326281806Srpaulo } 327281806Srpaulo return 0; 328281806Srpaulo } 329281806Srpaulo 330281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 331281806Srpaulo (unsigned int) wps->wps->network_key_len); 332189251Ssam wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 333189251Ssam wpabuf_put_be16(msg, wps->wps->network_key_len); 334189251Ssam wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 335189251Ssam return 0; 336189251Ssam} 337189251Ssam 338189251Ssam 339189251Ssamstatic int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 340189251Ssam{ 341189251Ssam wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 342189251Ssam wpabuf_put_be16(msg, ATTR_MAC_ADDR); 343189251Ssam wpabuf_put_be16(msg, ETH_ALEN); 344189251Ssam wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 345189251Ssam return 0; 346189251Ssam} 347189251Ssam 348189251Ssam 349189251Ssamstatic int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 350189251Ssam{ 351281806Srpaulo const u8 *start, *end; 352281806Srpaulo int ret; 353281806Srpaulo 354189251Ssam if (wps->wps->ap_settings) { 355189251Ssam wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 356189251Ssam wpabuf_put_data(plain, wps->wps->ap_settings, 357189251Ssam wps->wps->ap_settings_len); 358189251Ssam return 0; 359189251Ssam } 360189251Ssam 361281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 362281806Srpaulo start = wpabuf_put(plain, 0); 363281806Srpaulo ret = wps_build_cred_ssid(wps, plain) || 364189251Ssam wps_build_cred_mac_addr(wps, plain) || 365189251Ssam wps_build_cred_auth_type(wps, plain) || 366189251Ssam wps_build_cred_encr_type(wps, plain) || 367189251Ssam wps_build_cred_network_key(wps, plain); 368281806Srpaulo end = wpabuf_put(plain, 0); 369281806Srpaulo 370281806Srpaulo wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 371281806Srpaulo start, end - start); 372281806Srpaulo 373281806Srpaulo return ret; 374189251Ssam} 375189251Ssam 376189251Ssam 377189251Ssamstatic struct wpabuf * wps_build_m7(struct wps_data *wps) 378189251Ssam{ 379189251Ssam struct wpabuf *msg, *plain; 380189251Ssam 381189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 382189251Ssam 383189251Ssam plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 384189251Ssam if (plain == NULL) 385189251Ssam return NULL; 386189251Ssam 387189251Ssam msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 388189251Ssam if (msg == NULL) { 389189251Ssam wpabuf_free(plain); 390189251Ssam return NULL; 391189251Ssam } 392189251Ssam 393189251Ssam if (wps_build_version(msg) || 394189251Ssam wps_build_msg_type(msg, WPS_M7) || 395189251Ssam wps_build_registrar_nonce(wps, msg) || 396189251Ssam wps_build_e_snonce2(wps, plain) || 397189251Ssam (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 398189251Ssam wps_build_key_wrap_auth(wps, plain) || 399189251Ssam wps_build_encr_settings(wps, msg, plain) || 400346981Scy wps_build_wfa_ext(msg, 0, NULL, 0, 0) || 401189251Ssam wps_build_authenticator(wps, msg)) { 402337817Scy wpabuf_clear_free(plain); 403189251Ssam wpabuf_free(msg); 404189251Ssam return NULL; 405189251Ssam } 406337817Scy wpabuf_clear_free(plain); 407189251Ssam 408214734Srpaulo if (wps->wps->ap && wps->wps->registrar) { 409214734Srpaulo /* 410214734Srpaulo * If the Registrar is only learning our current configuration, 411214734Srpaulo * it may not continue protocol run to successful completion. 412214734Srpaulo * Store information here to make sure it remains available. 413214734Srpaulo */ 414214734Srpaulo wps_device_store(wps->wps->registrar, &wps->peer_dev, 415214734Srpaulo wps->uuid_r); 416214734Srpaulo } 417214734Srpaulo 418189251Ssam wps->state = RECV_M8; 419189251Ssam return msg; 420189251Ssam} 421189251Ssam 422189251Ssam 423189251Ssamstatic struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 424189251Ssam{ 425189251Ssam struct wpabuf *msg; 426189251Ssam 427189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 428189251Ssam 429189251Ssam msg = wpabuf_alloc(1000); 430189251Ssam if (msg == NULL) 431189251Ssam return NULL; 432189251Ssam 433189251Ssam if (wps_build_version(msg) || 434189251Ssam wps_build_msg_type(msg, WPS_WSC_DONE) || 435189251Ssam wps_build_enrollee_nonce(wps, msg) || 436252726Srpaulo wps_build_registrar_nonce(wps, msg) || 437346981Scy wps_build_wfa_ext(msg, 0, NULL, 0, 0)) { 438189251Ssam wpabuf_free(msg); 439189251Ssam return NULL; 440189251Ssam } 441189251Ssam 442189251Ssam if (wps->wps->ap) 443189251Ssam wps->state = RECV_ACK; 444189251Ssam else { 445281806Srpaulo wps_success_event(wps->wps, wps->peer_dev.mac_addr); 446189251Ssam wps->state = WPS_FINISHED; 447189251Ssam } 448189251Ssam return msg; 449189251Ssam} 450189251Ssam 451189251Ssam 452189251Ssamstruct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 453189251Ssam enum wsc_op_code *op_code) 454189251Ssam{ 455189251Ssam struct wpabuf *msg; 456189251Ssam 457189251Ssam switch (wps->state) { 458189251Ssam case SEND_M1: 459189251Ssam msg = wps_build_m1(wps); 460189251Ssam *op_code = WSC_MSG; 461189251Ssam break; 462189251Ssam case SEND_M3: 463189251Ssam msg = wps_build_m3(wps); 464189251Ssam *op_code = WSC_MSG; 465189251Ssam break; 466189251Ssam case SEND_M5: 467189251Ssam msg = wps_build_m5(wps); 468189251Ssam *op_code = WSC_MSG; 469189251Ssam break; 470189251Ssam case SEND_M7: 471189251Ssam msg = wps_build_m7(wps); 472189251Ssam *op_code = WSC_MSG; 473189251Ssam break; 474189251Ssam case RECEIVED_M2D: 475189251Ssam if (wps->wps->ap) { 476189251Ssam msg = wps_build_wsc_nack(wps); 477189251Ssam *op_code = WSC_NACK; 478189251Ssam break; 479189251Ssam } 480189251Ssam msg = wps_build_wsc_ack(wps); 481189251Ssam *op_code = WSC_ACK; 482189251Ssam if (msg) { 483189251Ssam /* Another M2/M2D may be received */ 484189251Ssam wps->state = RECV_M2; 485189251Ssam } 486189251Ssam break; 487189251Ssam case SEND_WSC_NACK: 488189251Ssam msg = wps_build_wsc_nack(wps); 489189251Ssam *op_code = WSC_NACK; 490189251Ssam break; 491189251Ssam case WPS_MSG_DONE: 492189251Ssam msg = wps_build_wsc_done(wps); 493189251Ssam *op_code = WSC_Done; 494189251Ssam break; 495189251Ssam default: 496189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 497189251Ssam "a message", wps->state); 498189251Ssam msg = NULL; 499189251Ssam break; 500189251Ssam } 501189251Ssam 502189251Ssam if (*op_code == WSC_MSG && msg) { 503189251Ssam /* Save a copy of the last message for Authenticator derivation 504189251Ssam */ 505189251Ssam wpabuf_free(wps->last_msg); 506189251Ssam wps->last_msg = wpabuf_dup(msg); 507189251Ssam } 508189251Ssam 509189251Ssam return msg; 510189251Ssam} 511189251Ssam 512189251Ssam 513189251Ssamstatic int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 514189251Ssam{ 515189251Ssam if (r_nonce == NULL) { 516189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 517189251Ssam return -1; 518189251Ssam } 519189251Ssam 520189251Ssam os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 521189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 522189251Ssam wps->nonce_r, WPS_NONCE_LEN); 523189251Ssam 524189251Ssam return 0; 525189251Ssam} 526189251Ssam 527189251Ssam 528189251Ssamstatic int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 529189251Ssam{ 530189251Ssam if (e_nonce == NULL) { 531189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 532189251Ssam return -1; 533189251Ssam } 534189251Ssam 535189251Ssam if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 536189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 537189251Ssam return -1; 538189251Ssam } 539189251Ssam 540189251Ssam return 0; 541189251Ssam} 542189251Ssam 543189251Ssam 544189251Ssamstatic int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 545189251Ssam{ 546189251Ssam if (uuid_r == NULL) { 547189251Ssam wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 548189251Ssam return -1; 549189251Ssam } 550189251Ssam 551189251Ssam os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 552189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 553189251Ssam 554189251Ssam return 0; 555189251Ssam} 556189251Ssam 557189251Ssam 558189251Ssamstatic int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 559189251Ssam size_t pk_len) 560189251Ssam{ 561189251Ssam if (pk == NULL || pk_len == 0) { 562189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 563189251Ssam return -1; 564189251Ssam } 565189251Ssam 566281806Srpaulo if (wps->peer_pubkey_hash_set) { 567281806Srpaulo u8 hash[WPS_HASH_LEN]; 568281806Srpaulo sha256_vector(1, &pk, &pk_len, hash); 569281806Srpaulo if (os_memcmp_const(hash, wps->peer_pubkey_hash, 570281806Srpaulo WPS_OOB_PUBKEY_HASH_LEN) != 0) { 571281806Srpaulo wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 572281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 573281806Srpaulo pk, pk_len); 574281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 575281806Srpaulo "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 576281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 577281806Srpaulo wps->peer_pubkey_hash, 578281806Srpaulo WPS_OOB_PUBKEY_HASH_LEN); 579281806Srpaulo wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 580281806Srpaulo return -1; 581281806Srpaulo } 582281806Srpaulo } 583281806Srpaulo 584189251Ssam wpabuf_free(wps->dh_pubkey_r); 585189251Ssam wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 586189251Ssam if (wps->dh_pubkey_r == NULL) 587189251Ssam return -1; 588189251Ssam 589189251Ssam if (wps_derive_keys(wps) < 0) 590189251Ssam return -1; 591189251Ssam 592189251Ssam return 0; 593189251Ssam} 594189251Ssam 595189251Ssam 596189251Ssamstatic int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 597189251Ssam{ 598189251Ssam if (r_hash1 == NULL) { 599189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 600189251Ssam return -1; 601189251Ssam } 602189251Ssam 603189251Ssam os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 604189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 605189251Ssam 606189251Ssam return 0; 607189251Ssam} 608189251Ssam 609189251Ssam 610189251Ssamstatic int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 611189251Ssam{ 612189251Ssam if (r_hash2 == NULL) { 613189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 614189251Ssam return -1; 615189251Ssam } 616189251Ssam 617189251Ssam os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 618189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 619189251Ssam 620189251Ssam return 0; 621189251Ssam} 622189251Ssam 623189251Ssam 624189251Ssamstatic int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 625189251Ssam{ 626189251Ssam u8 hash[SHA256_MAC_LEN]; 627189251Ssam const u8 *addr[4]; 628189251Ssam size_t len[4]; 629189251Ssam 630189251Ssam if (r_snonce1 == NULL) { 631189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 632189251Ssam return -1; 633189251Ssam } 634189251Ssam 635189251Ssam wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 636189251Ssam WPS_SECRET_NONCE_LEN); 637189251Ssam 638189251Ssam /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 639189251Ssam addr[0] = r_snonce1; 640189251Ssam len[0] = WPS_SECRET_NONCE_LEN; 641189251Ssam addr[1] = wps->psk1; 642189251Ssam len[1] = WPS_PSK_LEN; 643189251Ssam addr[2] = wpabuf_head(wps->dh_pubkey_e); 644189251Ssam len[2] = wpabuf_len(wps->dh_pubkey_e); 645189251Ssam addr[3] = wpabuf_head(wps->dh_pubkey_r); 646189251Ssam len[3] = wpabuf_len(wps->dh_pubkey_r); 647189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 648189251Ssam 649281806Srpaulo if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 650189251Ssam wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 651189251Ssam "not match with the pre-committed value"); 652189251Ssam wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 653281806Srpaulo wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 654189251Ssam return -1; 655189251Ssam } 656189251Ssam 657189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 658189251Ssam "half of the device password"); 659189251Ssam 660189251Ssam return 0; 661189251Ssam} 662189251Ssam 663189251Ssam 664189251Ssamstatic int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 665189251Ssam{ 666189251Ssam u8 hash[SHA256_MAC_LEN]; 667189251Ssam const u8 *addr[4]; 668189251Ssam size_t len[4]; 669189251Ssam 670189251Ssam if (r_snonce2 == NULL) { 671189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 672189251Ssam return -1; 673189251Ssam } 674189251Ssam 675189251Ssam wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 676189251Ssam WPS_SECRET_NONCE_LEN); 677189251Ssam 678189251Ssam /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 679189251Ssam addr[0] = r_snonce2; 680189251Ssam len[0] = WPS_SECRET_NONCE_LEN; 681189251Ssam addr[1] = wps->psk2; 682189251Ssam len[1] = WPS_PSK_LEN; 683189251Ssam addr[2] = wpabuf_head(wps->dh_pubkey_e); 684189251Ssam len[2] = wpabuf_len(wps->dh_pubkey_e); 685189251Ssam addr[3] = wpabuf_head(wps->dh_pubkey_r); 686189251Ssam len[3] = wpabuf_len(wps->dh_pubkey_r); 687189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 688189251Ssam 689281806Srpaulo if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 690189251Ssam wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 691189251Ssam "not match with the pre-committed value"); 692189251Ssam wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 693281806Srpaulo wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 694189251Ssam return -1; 695189251Ssam } 696189251Ssam 697189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 698189251Ssam "half of the device password"); 699189251Ssam 700189251Ssam return 0; 701189251Ssam} 702189251Ssam 703189251Ssam 704189251Ssamstatic int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 705252726Srpaulo size_t cred_len, int wps2) 706189251Ssam{ 707189251Ssam struct wps_parse_attr attr; 708189251Ssam struct wpabuf msg; 709252726Srpaulo int ret = 0; 710189251Ssam 711189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 712189251Ssam os_memset(&wps->cred, 0, sizeof(wps->cred)); 713189251Ssam wpabuf_set(&msg, cred, cred_len); 714189251Ssam if (wps_parse_msg(&msg, &attr) < 0 || 715189251Ssam wps_process_cred(&attr, &wps->cred)) 716189251Ssam return -1; 717189251Ssam 718209158Srpaulo if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 719209158Srpaulo 0) { 720209158Srpaulo wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 721209158Srpaulo MACSTR ") does not match with own address (" MACSTR 722209158Srpaulo ")", MAC2STR(wps->cred.mac_addr), 723209158Srpaulo MAC2STR(wps->wps->dev.mac_addr)); 724209158Srpaulo /* 725209158Srpaulo * In theory, this could be consider fatal error, but there are 726209158Srpaulo * number of deployed implementations using other address here 727209158Srpaulo * due to unclarity in the specification. For interoperability 728209158Srpaulo * reasons, allow this to be processed since we do not really 729209158Srpaulo * use the MAC Address information for anything. 730209158Srpaulo */ 731252726Srpaulo#ifdef CONFIG_WPS_STRICT 732252726Srpaulo if (wps2) { 733252726Srpaulo wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 734252726Srpaulo "MAC Address in AP Settings"); 735252726Srpaulo return -1; 736252726Srpaulo } 737252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 738209158Srpaulo } 739209158Srpaulo 740252726Srpaulo if (!(wps->cred.encr_type & 741252726Srpaulo (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 742252726Srpaulo if (wps->cred.encr_type & WPS_ENCR_WEP) { 743252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject Credential " 744252726Srpaulo "due to WEP configuration"); 745252726Srpaulo wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 746252726Srpaulo return -2; 747252726Srpaulo } 748252726Srpaulo 749252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 750252726Srpaulo "invalid encr_type 0x%x", wps->cred.encr_type); 751252726Srpaulo return -1; 752252726Srpaulo } 753252726Srpaulo 754189251Ssam if (wps->wps->cred_cb) { 755189251Ssam wps->cred.cred_attr = cred - 4; 756189251Ssam wps->cred.cred_attr_len = cred_len + 4; 757252726Srpaulo ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 758189251Ssam wps->cred.cred_attr = NULL; 759189251Ssam wps->cred.cred_attr_len = 0; 760189251Ssam } 761189251Ssam 762252726Srpaulo return ret; 763189251Ssam} 764189251Ssam 765189251Ssam 766189251Ssamstatic int wps_process_creds(struct wps_data *wps, const u8 *cred[], 767289549Srpaulo u16 cred_len[], unsigned int num_cred, int wps2) 768189251Ssam{ 769189251Ssam size_t i; 770252726Srpaulo int ok = 0; 771189251Ssam 772189251Ssam if (wps->wps->ap) 773189251Ssam return 0; 774189251Ssam 775189251Ssam if (num_cred == 0) { 776189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 777189251Ssam "received"); 778189251Ssam return -1; 779189251Ssam } 780189251Ssam 781189251Ssam for (i = 0; i < num_cred; i++) { 782252726Srpaulo int res; 783252726Srpaulo res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 784252726Srpaulo if (res == 0) 785252726Srpaulo ok++; 786252726Srpaulo else if (res == -2) 787252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 788252726Srpaulo else 789189251Ssam return -1; 790189251Ssam } 791189251Ssam 792252726Srpaulo if (ok == 0) { 793252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 794252726Srpaulo "received"); 795252726Srpaulo return -1; 796252726Srpaulo } 797252726Srpaulo 798189251Ssam return 0; 799189251Ssam} 800189251Ssam 801189251Ssam 802189251Ssamstatic int wps_process_ap_settings_e(struct wps_data *wps, 803189251Ssam struct wps_parse_attr *attr, 804252726Srpaulo struct wpabuf *attrs, int wps2) 805189251Ssam{ 806189251Ssam struct wps_credential cred; 807289549Srpaulo int ret = 0; 808189251Ssam 809189251Ssam if (!wps->wps->ap) 810189251Ssam return 0; 811189251Ssam 812189251Ssam if (wps_process_ap_settings(attr, &cred) < 0) 813189251Ssam return -1; 814189251Ssam 815189251Ssam wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 816189251Ssam "Registrar"); 817189251Ssam 818209158Srpaulo if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 819209158Srpaulo 0) { 820209158Srpaulo wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 821209158Srpaulo MACSTR ") does not match with own address (" MACSTR 822209158Srpaulo ")", MAC2STR(cred.mac_addr), 823209158Srpaulo MAC2STR(wps->wps->dev.mac_addr)); 824209158Srpaulo /* 825209158Srpaulo * In theory, this could be consider fatal error, but there are 826209158Srpaulo * number of deployed implementations using other address here 827209158Srpaulo * due to unclarity in the specification. For interoperability 828209158Srpaulo * reasons, allow this to be processed since we do not really 829209158Srpaulo * use the MAC Address information for anything. 830209158Srpaulo */ 831252726Srpaulo#ifdef CONFIG_WPS_STRICT 832252726Srpaulo if (wps2) { 833252726Srpaulo wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 834252726Srpaulo "MAC Address in AP Settings"); 835252726Srpaulo return -1; 836252726Srpaulo } 837252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 838209158Srpaulo } 839209158Srpaulo 840252726Srpaulo if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 841252726Srpaulo { 842252726Srpaulo if (cred.encr_type & WPS_ENCR_WEP) { 843252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 844252726Srpaulo "due to WEP configuration"); 845252726Srpaulo wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 846252726Srpaulo return -1; 847252726Srpaulo } 848252726Srpaulo 849252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 850252726Srpaulo "invalid encr_type 0x%x", cred.encr_type); 851252726Srpaulo return -1; 852252726Srpaulo } 853252726Srpaulo 854252726Srpaulo#ifdef CONFIG_WPS_STRICT 855252726Srpaulo if (wps2) { 856252726Srpaulo if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 857252726Srpaulo WPS_ENCR_TKIP || 858252726Srpaulo (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 859252726Srpaulo WPS_AUTH_WPAPSK) { 860252726Srpaulo wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 861252726Srpaulo "AP Settings: WPA-Personal/TKIP only"); 862252726Srpaulo wps->error_indication = 863252726Srpaulo WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 864252726Srpaulo return -1; 865252726Srpaulo } 866252726Srpaulo } 867252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 868252726Srpaulo 869252726Srpaulo if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 870252726Srpaulo { 871252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 872252726Srpaulo "TKIP+AES"); 873252726Srpaulo cred.encr_type |= WPS_ENCR_AES; 874252726Srpaulo } 875252726Srpaulo 876252726Srpaulo if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 877252726Srpaulo WPS_AUTH_WPAPSK) { 878252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 879252726Srpaulo "WPAPSK+WPA2PSK"); 880252726Srpaulo cred.auth_type |= WPS_AUTH_WPA2PSK; 881252726Srpaulo } 882252726Srpaulo 883189251Ssam if (wps->wps->cred_cb) { 884189251Ssam cred.cred_attr = wpabuf_head(attrs); 885189251Ssam cred.cred_attr_len = wpabuf_len(attrs); 886289549Srpaulo ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 887189251Ssam } 888189251Ssam 889289549Srpaulo return ret; 890189251Ssam} 891189251Ssam 892189251Ssam 893281806Srpaulostatic int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 894281806Srpaulo{ 895281806Srpaulo u16 id; 896281806Srpaulo 897281806Srpaulo if (dev_pw_id == NULL) { 898281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 899281806Srpaulo return -1; 900281806Srpaulo } 901281806Srpaulo 902281806Srpaulo id = WPA_GET_BE16(dev_pw_id); 903281806Srpaulo if (wps->dev_pw_id == id) { 904281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 905281806Srpaulo return 0; 906281806Srpaulo } 907281806Srpaulo 908281806Srpaulo#ifdef CONFIG_P2P 909281806Srpaulo if ((id == DEV_PW_DEFAULT && 910281806Srpaulo wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 911281806Srpaulo (id == DEV_PW_REGISTRAR_SPECIFIED && 912281806Srpaulo wps->dev_pw_id == DEV_PW_DEFAULT)) { 913281806Srpaulo /* 914281806Srpaulo * Common P2P use cases indicate whether the PIN is from the 915281806Srpaulo * client or GO using Device Password Id in M1/M2 in a way that 916281806Srpaulo * does not look fully compliant with WSC specification. Anyway, 917281806Srpaulo * this is deployed and needs to be allowed, so ignore changes 918281806Srpaulo * between Registrar-Specified and Default PIN. 919281806Srpaulo */ 920281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 921281806Srpaulo "change"); 922281806Srpaulo return 0; 923281806Srpaulo } 924281806Srpaulo#endif /* CONFIG_P2P */ 925281806Srpaulo 926281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 927281806Srpaulo "ID from %u to %u", wps->dev_pw_id, id); 928281806Srpaulo 929281806Srpaulo if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 930281806Srpaulo wpa_printf(MSG_DEBUG, 931281806Srpaulo "WPS: Workaround - ignore PBC-to-PIN change"); 932281806Srpaulo return 0; 933281806Srpaulo } 934281806Srpaulo 935281806Srpaulo if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 936281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 937281806Srpaulo bin_clear_free(wps->dev_password, wps->dev_password_len); 938281806Srpaulo wps->dev_pw_id = wps->alt_dev_pw_id; 939281806Srpaulo wps->dev_password = wps->alt_dev_password; 940281806Srpaulo wps->dev_password_len = wps->alt_dev_password_len; 941281806Srpaulo wps->alt_dev_password = NULL; 942281806Srpaulo wps->alt_dev_password_len = 0; 943281806Srpaulo return 0; 944281806Srpaulo } 945281806Srpaulo 946281806Srpaulo return -1; 947281806Srpaulo} 948281806Srpaulo 949281806Srpaulo 950189251Ssamstatic enum wps_process_res wps_process_m2(struct wps_data *wps, 951189251Ssam const struct wpabuf *msg, 952189251Ssam struct wps_parse_attr *attr) 953189251Ssam{ 954189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M2"); 955189251Ssam 956189251Ssam if (wps->state != RECV_M2) { 957189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 958189251Ssam "receiving M2", wps->state); 959189251Ssam wps->state = SEND_WSC_NACK; 960189251Ssam return WPS_CONTINUE; 961189251Ssam } 962189251Ssam 963189251Ssam if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 964189251Ssam wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 965281806Srpaulo wps_process_uuid_r(wps, attr->uuid_r) || 966281806Srpaulo wps_process_dev_pw_id(wps, attr->dev_password_id)) { 967189251Ssam wps->state = SEND_WSC_NACK; 968189251Ssam return WPS_CONTINUE; 969189251Ssam } 970189251Ssam 971252726Srpaulo /* 972252726Srpaulo * Stop here on an AP as an Enrollee if AP Setup is locked unless the 973252726Srpaulo * special locked mode is used to allow protocol run up to M7 in order 974252726Srpaulo * to support external Registrars that only learn the current AP 975252726Srpaulo * configuration without changing it. 976252726Srpaulo */ 977214734Srpaulo if (wps->wps->ap && 978252726Srpaulo ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 979252726Srpaulo wps->dev_password == NULL)) { 980189251Ssam wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 981189251Ssam "registration of a new Registrar"); 982189251Ssam wps->config_error = WPS_CFG_SETUP_LOCKED; 983189251Ssam wps->state = SEND_WSC_NACK; 984189251Ssam return WPS_CONTINUE; 985189251Ssam } 986189251Ssam 987214734Srpaulo if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 988214734Srpaulo wps_process_authenticator(wps, attr->authenticator, msg) || 989214734Srpaulo wps_process_device_attrs(&wps->peer_dev, attr)) { 990214734Srpaulo wps->state = SEND_WSC_NACK; 991214734Srpaulo return WPS_CONTINUE; 992214734Srpaulo } 993214734Srpaulo 994281806Srpaulo#ifdef CONFIG_WPS_NFC 995281806Srpaulo if (wps->peer_pubkey_hash_set) { 996281806Srpaulo struct wpabuf *decrypted; 997281806Srpaulo struct wps_parse_attr eattr; 998281806Srpaulo 999281806Srpaulo decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1000281806Srpaulo attr->encr_settings_len); 1001281806Srpaulo if (decrypted == NULL) { 1002281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 1003281806Srpaulo "Encrypted Settings attribute"); 1004281806Srpaulo wps->state = SEND_WSC_NACK; 1005281806Srpaulo return WPS_CONTINUE; 1006281806Srpaulo } 1007281806Srpaulo 1008281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 1009281806Srpaulo "Settings attribute"); 1010281806Srpaulo if (wps_parse_msg(decrypted, &eattr) < 0 || 1011281806Srpaulo wps_process_key_wrap_auth(wps, decrypted, 1012281806Srpaulo eattr.key_wrap_auth) || 1013281806Srpaulo wps_process_creds(wps, eattr.cred, eattr.cred_len, 1014281806Srpaulo eattr.num_cred, attr->version2 != NULL)) { 1015337817Scy wpabuf_clear_free(decrypted); 1016281806Srpaulo wps->state = SEND_WSC_NACK; 1017281806Srpaulo return WPS_CONTINUE; 1018281806Srpaulo } 1019337817Scy wpabuf_clear_free(decrypted); 1020281806Srpaulo 1021281806Srpaulo wps->state = WPS_MSG_DONE; 1022281806Srpaulo return WPS_CONTINUE; 1023281806Srpaulo } 1024281806Srpaulo#endif /* CONFIG_WPS_NFC */ 1025281806Srpaulo 1026189251Ssam wps->state = SEND_M3; 1027189251Ssam return WPS_CONTINUE; 1028189251Ssam} 1029189251Ssam 1030189251Ssam 1031189251Ssamstatic enum wps_process_res wps_process_m2d(struct wps_data *wps, 1032189251Ssam struct wps_parse_attr *attr) 1033189251Ssam{ 1034189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1035189251Ssam 1036189251Ssam if (wps->state != RECV_M2) { 1037189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1038189251Ssam "receiving M2D", wps->state); 1039189251Ssam wps->state = SEND_WSC_NACK; 1040189251Ssam return WPS_CONTINUE; 1041189251Ssam } 1042189251Ssam 1043189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1044189251Ssam attr->manufacturer, attr->manufacturer_len); 1045189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1046189251Ssam attr->model_name, attr->model_name_len); 1047189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1048189251Ssam attr->model_number, attr->model_number_len); 1049189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1050189251Ssam attr->serial_number, attr->serial_number_len); 1051189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1052189251Ssam attr->dev_name, attr->dev_name_len); 1053189251Ssam 1054189251Ssam if (wps->wps->event_cb) { 1055189251Ssam union wps_event_data data; 1056189251Ssam struct wps_event_m2d *m2d = &data.m2d; 1057189251Ssam os_memset(&data, 0, sizeof(data)); 1058189251Ssam if (attr->config_methods) 1059189251Ssam m2d->config_methods = 1060189251Ssam WPA_GET_BE16(attr->config_methods); 1061189251Ssam m2d->manufacturer = attr->manufacturer; 1062189251Ssam m2d->manufacturer_len = attr->manufacturer_len; 1063189251Ssam m2d->model_name = attr->model_name; 1064189251Ssam m2d->model_name_len = attr->model_name_len; 1065189251Ssam m2d->model_number = attr->model_number; 1066189251Ssam m2d->model_number_len = attr->model_number_len; 1067189251Ssam m2d->serial_number = attr->serial_number; 1068189251Ssam m2d->serial_number_len = attr->serial_number_len; 1069189251Ssam m2d->dev_name = attr->dev_name; 1070189251Ssam m2d->dev_name_len = attr->dev_name_len; 1071189251Ssam m2d->primary_dev_type = attr->primary_dev_type; 1072189251Ssam if (attr->config_error) 1073189251Ssam m2d->config_error = 1074189251Ssam WPA_GET_BE16(attr->config_error); 1075189251Ssam if (attr->dev_password_id) 1076189251Ssam m2d->dev_password_id = 1077189251Ssam WPA_GET_BE16(attr->dev_password_id); 1078189251Ssam wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1079189251Ssam } 1080189251Ssam 1081189251Ssam wps->state = RECEIVED_M2D; 1082189251Ssam return WPS_CONTINUE; 1083189251Ssam} 1084189251Ssam 1085189251Ssam 1086189251Ssamstatic enum wps_process_res wps_process_m4(struct wps_data *wps, 1087189251Ssam const struct wpabuf *msg, 1088189251Ssam struct wps_parse_attr *attr) 1089189251Ssam{ 1090189251Ssam struct wpabuf *decrypted; 1091189251Ssam struct wps_parse_attr eattr; 1092189251Ssam 1093189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1094189251Ssam 1095189251Ssam if (wps->state != RECV_M4) { 1096189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1097189251Ssam "receiving M4", wps->state); 1098189251Ssam wps->state = SEND_WSC_NACK; 1099189251Ssam return WPS_CONTINUE; 1100189251Ssam } 1101189251Ssam 1102189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1103189251Ssam wps_process_authenticator(wps, attr->authenticator, msg) || 1104189251Ssam wps_process_r_hash1(wps, attr->r_hash1) || 1105189251Ssam wps_process_r_hash2(wps, attr->r_hash2)) { 1106189251Ssam wps->state = SEND_WSC_NACK; 1107189251Ssam return WPS_CONTINUE; 1108189251Ssam } 1109189251Ssam 1110189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1111189251Ssam attr->encr_settings_len); 1112189251Ssam if (decrypted == NULL) { 1113189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1114189251Ssam "Settings attribute"); 1115189251Ssam wps->state = SEND_WSC_NACK; 1116189251Ssam return WPS_CONTINUE; 1117189251Ssam } 1118189251Ssam 1119252726Srpaulo if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1120337817Scy wpabuf_clear_free(decrypted); 1121252726Srpaulo wps->state = SEND_WSC_NACK; 1122252726Srpaulo return WPS_CONTINUE; 1123252726Srpaulo } 1124252726Srpaulo 1125189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1126189251Ssam "attribute"); 1127189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1128189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1129189251Ssam wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1130337817Scy wpabuf_clear_free(decrypted); 1131189251Ssam wps->state = SEND_WSC_NACK; 1132189251Ssam return WPS_CONTINUE; 1133189251Ssam } 1134337817Scy wpabuf_clear_free(decrypted); 1135189251Ssam 1136189251Ssam wps->state = SEND_M5; 1137189251Ssam return WPS_CONTINUE; 1138189251Ssam} 1139189251Ssam 1140189251Ssam 1141189251Ssamstatic enum wps_process_res wps_process_m6(struct wps_data *wps, 1142189251Ssam const struct wpabuf *msg, 1143189251Ssam struct wps_parse_attr *attr) 1144189251Ssam{ 1145189251Ssam struct wpabuf *decrypted; 1146189251Ssam struct wps_parse_attr eattr; 1147189251Ssam 1148189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1149189251Ssam 1150189251Ssam if (wps->state != RECV_M6) { 1151189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1152189251Ssam "receiving M6", wps->state); 1153189251Ssam wps->state = SEND_WSC_NACK; 1154189251Ssam return WPS_CONTINUE; 1155189251Ssam } 1156189251Ssam 1157189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1158189251Ssam wps_process_authenticator(wps, attr->authenticator, msg)) { 1159189251Ssam wps->state = SEND_WSC_NACK; 1160189251Ssam return WPS_CONTINUE; 1161189251Ssam } 1162189251Ssam 1163189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1164189251Ssam attr->encr_settings_len); 1165189251Ssam if (decrypted == NULL) { 1166189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1167189251Ssam "Settings attribute"); 1168189251Ssam wps->state = SEND_WSC_NACK; 1169189251Ssam return WPS_CONTINUE; 1170189251Ssam } 1171189251Ssam 1172252726Srpaulo if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1173337817Scy wpabuf_clear_free(decrypted); 1174252726Srpaulo wps->state = SEND_WSC_NACK; 1175252726Srpaulo return WPS_CONTINUE; 1176252726Srpaulo } 1177252726Srpaulo 1178189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1179189251Ssam "attribute"); 1180189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1181189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1182189251Ssam wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1183337817Scy wpabuf_clear_free(decrypted); 1184189251Ssam wps->state = SEND_WSC_NACK; 1185189251Ssam return WPS_CONTINUE; 1186189251Ssam } 1187337817Scy wpabuf_clear_free(decrypted); 1188189251Ssam 1189252726Srpaulo if (wps->wps->ap) 1190252726Srpaulo wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1191252726Srpaulo NULL); 1192252726Srpaulo 1193189251Ssam wps->state = SEND_M7; 1194189251Ssam return WPS_CONTINUE; 1195189251Ssam} 1196189251Ssam 1197189251Ssam 1198189251Ssamstatic enum wps_process_res wps_process_m8(struct wps_data *wps, 1199189251Ssam const struct wpabuf *msg, 1200189251Ssam struct wps_parse_attr *attr) 1201189251Ssam{ 1202189251Ssam struct wpabuf *decrypted; 1203189251Ssam struct wps_parse_attr eattr; 1204189251Ssam 1205189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1206189251Ssam 1207189251Ssam if (wps->state != RECV_M8) { 1208189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1209189251Ssam "receiving M8", wps->state); 1210189251Ssam wps->state = SEND_WSC_NACK; 1211189251Ssam return WPS_CONTINUE; 1212189251Ssam } 1213189251Ssam 1214189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1215189251Ssam wps_process_authenticator(wps, attr->authenticator, msg)) { 1216189251Ssam wps->state = SEND_WSC_NACK; 1217189251Ssam return WPS_CONTINUE; 1218189251Ssam } 1219189251Ssam 1220252726Srpaulo if (wps->wps->ap && wps->wps->ap_setup_locked) { 1221252726Srpaulo /* 1222252726Srpaulo * Stop here if special ap_setup_locked == 2 mode allowed the 1223252726Srpaulo * protocol to continue beyond M2. This allows ER to learn the 1224252726Srpaulo * current AP settings without changing them. 1225252726Srpaulo */ 1226252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1227252726Srpaulo "registration of a new Registrar"); 1228252726Srpaulo wps->config_error = WPS_CFG_SETUP_LOCKED; 1229252726Srpaulo wps->state = SEND_WSC_NACK; 1230252726Srpaulo return WPS_CONTINUE; 1231252726Srpaulo } 1232252726Srpaulo 1233189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1234189251Ssam attr->encr_settings_len); 1235189251Ssam if (decrypted == NULL) { 1236189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1237189251Ssam "Settings attribute"); 1238189251Ssam wps->state = SEND_WSC_NACK; 1239189251Ssam return WPS_CONTINUE; 1240189251Ssam } 1241189251Ssam 1242252726Srpaulo if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1243252726Srpaulo attr->version2 != NULL) < 0) { 1244337817Scy wpabuf_clear_free(decrypted); 1245252726Srpaulo wps->state = SEND_WSC_NACK; 1246252726Srpaulo return WPS_CONTINUE; 1247252726Srpaulo } 1248252726Srpaulo 1249189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1250189251Ssam "attribute"); 1251189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1252189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1253189251Ssam wps_process_creds(wps, eattr.cred, eattr.cred_len, 1254252726Srpaulo eattr.num_cred, attr->version2 != NULL) || 1255252726Srpaulo wps_process_ap_settings_e(wps, &eattr, decrypted, 1256252726Srpaulo attr->version2 != NULL)) { 1257337817Scy wpabuf_clear_free(decrypted); 1258189251Ssam wps->state = SEND_WSC_NACK; 1259189251Ssam return WPS_CONTINUE; 1260189251Ssam } 1261337817Scy wpabuf_clear_free(decrypted); 1262189251Ssam 1263189251Ssam wps->state = WPS_MSG_DONE; 1264189251Ssam return WPS_CONTINUE; 1265189251Ssam} 1266189251Ssam 1267189251Ssam 1268189251Ssamstatic enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1269189251Ssam const struct wpabuf *msg) 1270189251Ssam{ 1271189251Ssam struct wps_parse_attr attr; 1272189251Ssam enum wps_process_res ret = WPS_CONTINUE; 1273189251Ssam 1274189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1275189251Ssam 1276189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1277189251Ssam return WPS_FAILURE; 1278189251Ssam 1279189251Ssam if (attr.enrollee_nonce == NULL || 1280252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1281189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1282189251Ssam return WPS_FAILURE; 1283189251Ssam } 1284189251Ssam 1285189251Ssam if (attr.msg_type == NULL) { 1286189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1287252726Srpaulo wps->state = SEND_WSC_NACK; 1288252726Srpaulo return WPS_CONTINUE; 1289189251Ssam } 1290189251Ssam 1291189251Ssam switch (*attr.msg_type) { 1292189251Ssam case WPS_M2: 1293252726Srpaulo if (wps_validate_m2(msg) < 0) 1294252726Srpaulo return WPS_FAILURE; 1295189251Ssam ret = wps_process_m2(wps, msg, &attr); 1296189251Ssam break; 1297189251Ssam case WPS_M2D: 1298252726Srpaulo if (wps_validate_m2d(msg) < 0) 1299252726Srpaulo return WPS_FAILURE; 1300189251Ssam ret = wps_process_m2d(wps, &attr); 1301189251Ssam break; 1302189251Ssam case WPS_M4: 1303252726Srpaulo if (wps_validate_m4(msg) < 0) 1304252726Srpaulo return WPS_FAILURE; 1305189251Ssam ret = wps_process_m4(wps, msg, &attr); 1306189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1307252726Srpaulo wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1308281806Srpaulo wps->error_indication, 1309281806Srpaulo wps->peer_dev.mac_addr); 1310189251Ssam break; 1311189251Ssam case WPS_M6: 1312252726Srpaulo if (wps_validate_m6(msg) < 0) 1313252726Srpaulo return WPS_FAILURE; 1314189251Ssam ret = wps_process_m6(wps, msg, &attr); 1315189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1316252726Srpaulo wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1317281806Srpaulo wps->error_indication, 1318281806Srpaulo wps->peer_dev.mac_addr); 1319189251Ssam break; 1320189251Ssam case WPS_M8: 1321252726Srpaulo if (wps_validate_m8(msg) < 0) 1322252726Srpaulo return WPS_FAILURE; 1323189251Ssam ret = wps_process_m8(wps, msg, &attr); 1324189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1325252726Srpaulo wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1326281806Srpaulo wps->error_indication, 1327281806Srpaulo wps->peer_dev.mac_addr); 1328189251Ssam break; 1329189251Ssam default: 1330189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1331189251Ssam *attr.msg_type); 1332189251Ssam return WPS_FAILURE; 1333189251Ssam } 1334189251Ssam 1335189251Ssam /* 1336189251Ssam * Save a copy of the last message for Authenticator derivation if we 1337189251Ssam * are continuing. However, skip M2D since it is not authenticated and 1338189251Ssam * neither is the ACK/NACK response frame. This allows the possibly 1339189251Ssam * following M2 to be processed correctly by using the previously sent 1340189251Ssam * M1 in Authenticator derivation. 1341189251Ssam */ 1342189251Ssam if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1343189251Ssam /* Save a copy of the last message for Authenticator derivation 1344189251Ssam */ 1345189251Ssam wpabuf_free(wps->last_msg); 1346189251Ssam wps->last_msg = wpabuf_dup(msg); 1347189251Ssam } 1348189251Ssam 1349189251Ssam return ret; 1350189251Ssam} 1351189251Ssam 1352189251Ssam 1353189251Ssamstatic enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1354189251Ssam const struct wpabuf *msg) 1355189251Ssam{ 1356189251Ssam struct wps_parse_attr attr; 1357189251Ssam 1358189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1359189251Ssam 1360189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1361189251Ssam return WPS_FAILURE; 1362189251Ssam 1363189251Ssam if (attr.msg_type == NULL) { 1364189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1365189251Ssam return WPS_FAILURE; 1366189251Ssam } 1367189251Ssam 1368189251Ssam if (*attr.msg_type != WPS_WSC_ACK) { 1369189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1370189251Ssam *attr.msg_type); 1371189251Ssam return WPS_FAILURE; 1372189251Ssam } 1373189251Ssam 1374189251Ssam if (attr.registrar_nonce == NULL || 1375252726Srpaulo os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1376189251Ssam { 1377189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1378189251Ssam return WPS_FAILURE; 1379189251Ssam } 1380189251Ssam 1381189251Ssam if (attr.enrollee_nonce == NULL || 1382252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1383189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1384189251Ssam return WPS_FAILURE; 1385189251Ssam } 1386189251Ssam 1387189251Ssam if (wps->state == RECV_ACK && wps->wps->ap) { 1388189251Ssam wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1389189251Ssam "completed successfully"); 1390281806Srpaulo wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1391189251Ssam wps->state = WPS_FINISHED; 1392189251Ssam return WPS_DONE; 1393189251Ssam } 1394189251Ssam 1395189251Ssam return WPS_FAILURE; 1396189251Ssam} 1397189251Ssam 1398189251Ssam 1399189251Ssamstatic enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1400189251Ssam const struct wpabuf *msg) 1401189251Ssam{ 1402189251Ssam struct wps_parse_attr attr; 1403252726Srpaulo u16 config_error; 1404189251Ssam 1405189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1406189251Ssam 1407189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1408189251Ssam return WPS_FAILURE; 1409189251Ssam 1410189251Ssam if (attr.msg_type == NULL) { 1411189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1412189251Ssam return WPS_FAILURE; 1413189251Ssam } 1414189251Ssam 1415189251Ssam if (*attr.msg_type != WPS_WSC_NACK) { 1416189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1417189251Ssam *attr.msg_type); 1418189251Ssam return WPS_FAILURE; 1419189251Ssam } 1420189251Ssam 1421189251Ssam if (attr.registrar_nonce == NULL || 1422252726Srpaulo os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1423189251Ssam { 1424189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1425189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1426189251Ssam attr.registrar_nonce, WPS_NONCE_LEN); 1427189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1428189251Ssam wps->nonce_r, WPS_NONCE_LEN); 1429189251Ssam return WPS_FAILURE; 1430189251Ssam } 1431189251Ssam 1432189251Ssam if (attr.enrollee_nonce == NULL || 1433252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1434189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1435189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1436189251Ssam attr.enrollee_nonce, WPS_NONCE_LEN); 1437189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1438189251Ssam wps->nonce_e, WPS_NONCE_LEN); 1439189251Ssam return WPS_FAILURE; 1440189251Ssam } 1441189251Ssam 1442189251Ssam if (attr.config_error == NULL) { 1443189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1444189251Ssam "in WSC_NACK"); 1445189251Ssam return WPS_FAILURE; 1446189251Ssam } 1447189251Ssam 1448252726Srpaulo config_error = WPA_GET_BE16(attr.config_error); 1449189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1450252726Srpaulo "Configuration Error %d", config_error); 1451189251Ssam 1452189251Ssam switch (wps->state) { 1453189251Ssam case RECV_M4: 1454252726Srpaulo wps_fail_event(wps->wps, WPS_M3, config_error, 1455281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1456189251Ssam break; 1457189251Ssam case RECV_M6: 1458252726Srpaulo wps_fail_event(wps->wps, WPS_M5, config_error, 1459281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1460189251Ssam break; 1461189251Ssam case RECV_M8: 1462252726Srpaulo wps_fail_event(wps->wps, WPS_M7, config_error, 1463281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1464189251Ssam break; 1465189251Ssam default: 1466189251Ssam break; 1467189251Ssam } 1468189251Ssam 1469189251Ssam /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1470189251Ssam * Enrollee is Authenticator */ 1471189251Ssam wps->state = SEND_WSC_NACK; 1472189251Ssam 1473189251Ssam return WPS_FAILURE; 1474189251Ssam} 1475189251Ssam 1476189251Ssam 1477189251Ssamenum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1478189251Ssam enum wsc_op_code op_code, 1479189251Ssam const struct wpabuf *msg) 1480189251Ssam{ 1481189251Ssam 1482189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1483189251Ssam "op_code=%d)", 1484189251Ssam (unsigned long) wpabuf_len(msg), op_code); 1485189251Ssam 1486209158Srpaulo if (op_code == WSC_UPnP) { 1487209158Srpaulo /* Determine the OpCode based on message type attribute */ 1488209158Srpaulo struct wps_parse_attr attr; 1489209158Srpaulo if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1490209158Srpaulo if (*attr.msg_type == WPS_WSC_ACK) 1491209158Srpaulo op_code = WSC_ACK; 1492209158Srpaulo else if (*attr.msg_type == WPS_WSC_NACK) 1493209158Srpaulo op_code = WSC_NACK; 1494209158Srpaulo } 1495209158Srpaulo } 1496209158Srpaulo 1497189251Ssam switch (op_code) { 1498189251Ssam case WSC_MSG: 1499189251Ssam case WSC_UPnP: 1500189251Ssam return wps_process_wsc_msg(wps, msg); 1501189251Ssam case WSC_ACK: 1502252726Srpaulo if (wps_validate_wsc_ack(msg) < 0) 1503252726Srpaulo return WPS_FAILURE; 1504189251Ssam return wps_process_wsc_ack(wps, msg); 1505189251Ssam case WSC_NACK: 1506252726Srpaulo if (wps_validate_wsc_nack(msg) < 0) 1507252726Srpaulo return WPS_FAILURE; 1508189251Ssam return wps_process_wsc_nack(wps, msg); 1509189251Ssam default: 1510189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1511189251Ssam return WPS_FAILURE; 1512189251Ssam } 1513189251Ssam} 1514