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; 108189251Ssam 109252726Srpaulo if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 110189251Ssam return NULL; 111189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 112189251Ssam wps->nonce_e, WPS_NONCE_LEN); 113189251Ssam 114189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 115189251Ssam msg = wpabuf_alloc(1000); 116189251Ssam if (msg == NULL) 117189251Ssam return NULL; 118189251Ssam 119252726Srpaulo config_methods = wps->wps->config_methods; 120252726Srpaulo if (wps->wps->ap && !wps->pbc_in_m1 && 121252726Srpaulo (wps->dev_password_len != 0 || 122252726Srpaulo (config_methods & WPS_CONFIG_DISPLAY))) { 123252726Srpaulo /* 124252726Srpaulo * These are the methods that the AP supports as an Enrollee 125252726Srpaulo * for adding external Registrars, so remove PushButton. 126252726Srpaulo * 127252726Srpaulo * As a workaround for Windows 7 mechanism for probing WPS 128252726Srpaulo * capabilities from M1, leave PushButton option if no PIN 129252726Srpaulo * method is available or if WPS configuration enables PBC 130252726Srpaulo * workaround. 131252726Srpaulo */ 132252726Srpaulo config_methods &= ~WPS_CONFIG_PUSHBUTTON; 133252726Srpaulo config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 134252726Srpaulo WPS_CONFIG_PHY_PUSHBUTTON); 135252726Srpaulo } 136252726Srpaulo 137189251Ssam if (wps_build_version(msg) || 138189251Ssam wps_build_msg_type(msg, WPS_M1) || 139189251Ssam wps_build_uuid_e(msg, wps->uuid_e) || 140281806Srpaulo wps_build_mac_addr(msg, wps->mac_addr_e) || 141189251Ssam wps_build_enrollee_nonce(wps, msg) || 142189251Ssam wps_build_public_key(wps, msg) || 143189251Ssam wps_build_auth_type_flags(wps, msg) || 144189251Ssam wps_build_encr_type_flags(wps, msg) || 145189251Ssam wps_build_conn_type_flags(wps, msg) || 146252726Srpaulo wps_build_config_methods(msg, config_methods) || 147189251Ssam wps_build_wps_state(wps, msg) || 148189251Ssam wps_build_device_attrs(&wps->wps->dev, msg) || 149281806Srpaulo wps_build_rf_bands(&wps->wps->dev, msg, 150281806Srpaulo wps->wps->rf_band_cb(wps->wps->cb_ctx)) || 151189251Ssam wps_build_assoc_state(wps, msg) || 152189251Ssam wps_build_dev_password_id(msg, wps->dev_pw_id) || 153189251Ssam wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 154252726Srpaulo wps_build_os_version(&wps->wps->dev, msg) || 155252726Srpaulo wps_build_wfa_ext(msg, 0, NULL, 0) || 156252726Srpaulo wps_build_vendor_ext_m1(&wps->wps->dev, msg)) { 157189251Ssam wpabuf_free(msg); 158189251Ssam return NULL; 159189251Ssam } 160189251Ssam 161189251Ssam wps->state = RECV_M2; 162189251Ssam return msg; 163189251Ssam} 164189251Ssam 165189251Ssam 166189251Ssamstatic struct wpabuf * wps_build_m3(struct wps_data *wps) 167189251Ssam{ 168189251Ssam struct wpabuf *msg; 169189251Ssam 170189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 171189251Ssam 172189251Ssam if (wps->dev_password == NULL) { 173189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 174189251Ssam return NULL; 175189251Ssam } 176189251Ssam wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 177189251Ssam 178281806Srpaulo if (wps->wps->ap && random_pool_ready() != 1) { 179281806Srpaulo wpa_printf(MSG_INFO, 180281806Srpaulo "WPS: Not enough entropy in random pool to proceed - do not allow AP PIN to be used"); 181281806Srpaulo return NULL; 182281806Srpaulo } 183281806Srpaulo 184189251Ssam msg = wpabuf_alloc(1000); 185189251Ssam if (msg == NULL) 186189251Ssam return NULL; 187189251Ssam 188189251Ssam if (wps_build_version(msg) || 189189251Ssam wps_build_msg_type(msg, WPS_M3) || 190189251Ssam wps_build_registrar_nonce(wps, msg) || 191189251Ssam wps_build_e_hash(wps, msg) || 192252726Srpaulo wps_build_wfa_ext(msg, 0, NULL, 0) || 193189251Ssam wps_build_authenticator(wps, msg)) { 194189251Ssam wpabuf_free(msg); 195189251Ssam return NULL; 196189251Ssam } 197189251Ssam 198189251Ssam wps->state = RECV_M4; 199189251Ssam return msg; 200189251Ssam} 201189251Ssam 202189251Ssam 203189251Ssamstatic struct wpabuf * wps_build_m5(struct wps_data *wps) 204189251Ssam{ 205189251Ssam struct wpabuf *msg, *plain; 206189251Ssam 207189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 208189251Ssam 209189251Ssam plain = wpabuf_alloc(200); 210189251Ssam if (plain == NULL) 211189251Ssam return NULL; 212189251Ssam 213189251Ssam msg = wpabuf_alloc(1000); 214189251Ssam if (msg == NULL) { 215189251Ssam wpabuf_free(plain); 216189251Ssam return NULL; 217189251Ssam } 218189251Ssam 219189251Ssam if (wps_build_version(msg) || 220189251Ssam wps_build_msg_type(msg, WPS_M5) || 221189251Ssam wps_build_registrar_nonce(wps, msg) || 222189251Ssam wps_build_e_snonce1(wps, plain) || 223189251Ssam wps_build_key_wrap_auth(wps, plain) || 224189251Ssam wps_build_encr_settings(wps, msg, plain) || 225252726Srpaulo wps_build_wfa_ext(msg, 0, NULL, 0) || 226189251Ssam wps_build_authenticator(wps, msg)) { 227189251Ssam wpabuf_free(plain); 228189251Ssam wpabuf_free(msg); 229189251Ssam return NULL; 230189251Ssam } 231189251Ssam wpabuf_free(plain); 232189251Ssam 233189251Ssam wps->state = RECV_M6; 234189251Ssam return msg; 235189251Ssam} 236189251Ssam 237189251Ssam 238189251Ssamstatic int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 239189251Ssam{ 240189251Ssam wpa_printf(MSG_DEBUG, "WPS: * SSID"); 241189251Ssam wpabuf_put_be16(msg, ATTR_SSID); 242189251Ssam wpabuf_put_be16(msg, wps->wps->ssid_len); 243189251Ssam wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 244189251Ssam return 0; 245189251Ssam} 246189251Ssam 247189251Ssam 248189251Ssamstatic int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 249189251Ssam{ 250281806Srpaulo u16 auth_type = wps->wps->ap_auth_type; 251252726Srpaulo 252281806Srpaulo /* 253281806Srpaulo * Work around issues with Windows 7 WPS implementation not liking 254281806Srpaulo * multiple Authentication Type bits in M7 AP Settings attribute by 255281806Srpaulo * showing only the most secure option from current configuration. 256281806Srpaulo */ 257252726Srpaulo if (auth_type & WPS_AUTH_WPA2PSK) 258252726Srpaulo auth_type = WPS_AUTH_WPA2PSK; 259252726Srpaulo else if (auth_type & WPS_AUTH_WPAPSK) 260252726Srpaulo auth_type = WPS_AUTH_WPAPSK; 261252726Srpaulo else if (auth_type & WPS_AUTH_OPEN) 262252726Srpaulo auth_type = WPS_AUTH_OPEN; 263252726Srpaulo 264252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type); 265189251Ssam wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 266189251Ssam wpabuf_put_be16(msg, 2); 267252726Srpaulo wpabuf_put_be16(msg, auth_type); 268189251Ssam return 0; 269189251Ssam} 270189251Ssam 271189251Ssam 272189251Ssamstatic int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 273189251Ssam{ 274281806Srpaulo u16 encr_type = wps->wps->ap_encr_type; 275252726Srpaulo 276281806Srpaulo /* 277281806Srpaulo * Work around issues with Windows 7 WPS implementation not liking 278281806Srpaulo * multiple Encryption Type bits in M7 AP Settings attribute by 279281806Srpaulo * showing only the most secure option from current configuration. 280281806Srpaulo */ 281281806Srpaulo if (wps->wps->ap_auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) { 282252726Srpaulo if (encr_type & WPS_ENCR_AES) 283252726Srpaulo encr_type = WPS_ENCR_AES; 284252726Srpaulo else if (encr_type & WPS_ENCR_TKIP) 285252726Srpaulo encr_type = WPS_ENCR_TKIP; 286252726Srpaulo } 287252726Srpaulo 288252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type); 289189251Ssam wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 290189251Ssam wpabuf_put_be16(msg, 2); 291252726Srpaulo wpabuf_put_be16(msg, encr_type); 292189251Ssam return 0; 293189251Ssam} 294189251Ssam 295189251Ssam 296189251Ssamstatic int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 297189251Ssam{ 298281806Srpaulo if ((wps->wps->ap_auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) && 299281806Srpaulo wps->wps->network_key_len == 0) { 300281806Srpaulo char hex[65]; 301281806Srpaulo u8 psk[32]; 302281806Srpaulo /* Generate a random per-device PSK */ 303281806Srpaulo if (random_pool_ready() != 1 || 304281806Srpaulo random_get_bytes(psk, sizeof(psk)) < 0) { 305281806Srpaulo wpa_printf(MSG_INFO, 306281806Srpaulo "WPS: Could not generate random PSK"); 307281806Srpaulo return -1; 308281806Srpaulo } 309281806Srpaulo wpa_hexdump_key(MSG_DEBUG, "WPS: Generated per-device PSK", 310281806Srpaulo psk, sizeof(psk)); 311281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 312281806Srpaulo (unsigned int) wps->new_psk_len * 2); 313281806Srpaulo wpa_snprintf_hex(hex, sizeof(hex), psk, sizeof(psk)); 314281806Srpaulo wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 315281806Srpaulo wpabuf_put_be16(msg, sizeof(psk) * 2); 316281806Srpaulo wpabuf_put_data(msg, hex, sizeof(psk) * 2); 317281806Srpaulo if (wps->wps->registrar) { 318281806Srpaulo wps_cb_new_psk(wps->wps->registrar, 319281806Srpaulo wps->peer_dev.mac_addr, 320281806Srpaulo wps->p2p_dev_addr, psk, sizeof(psk)); 321281806Srpaulo } 322281806Srpaulo return 0; 323281806Srpaulo } 324281806Srpaulo 325281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * Network Key (len=%u)", 326281806Srpaulo (unsigned int) wps->wps->network_key_len); 327189251Ssam wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 328189251Ssam wpabuf_put_be16(msg, wps->wps->network_key_len); 329189251Ssam wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 330189251Ssam return 0; 331189251Ssam} 332189251Ssam 333189251Ssam 334189251Ssamstatic int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 335189251Ssam{ 336189251Ssam wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 337189251Ssam wpabuf_put_be16(msg, ATTR_MAC_ADDR); 338189251Ssam wpabuf_put_be16(msg, ETH_ALEN); 339189251Ssam wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 340189251Ssam return 0; 341189251Ssam} 342189251Ssam 343189251Ssam 344189251Ssamstatic int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 345189251Ssam{ 346281806Srpaulo const u8 *start, *end; 347281806Srpaulo int ret; 348281806Srpaulo 349189251Ssam if (wps->wps->ap_settings) { 350189251Ssam wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 351189251Ssam wpabuf_put_data(plain, wps->wps->ap_settings, 352189251Ssam wps->wps->ap_settings_len); 353189251Ssam return 0; 354189251Ssam } 355189251Ssam 356281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: * AP Settings based on current configuration"); 357281806Srpaulo start = wpabuf_put(plain, 0); 358281806Srpaulo ret = wps_build_cred_ssid(wps, plain) || 359189251Ssam wps_build_cred_mac_addr(wps, plain) || 360189251Ssam wps_build_cred_auth_type(wps, plain) || 361189251Ssam wps_build_cred_encr_type(wps, plain) || 362189251Ssam wps_build_cred_network_key(wps, plain); 363281806Srpaulo end = wpabuf_put(plain, 0); 364281806Srpaulo 365281806Srpaulo wpa_hexdump_key(MSG_DEBUG, "WPS: Plaintext AP Settings", 366281806Srpaulo start, end - start); 367281806Srpaulo 368281806Srpaulo return ret; 369189251Ssam} 370189251Ssam 371189251Ssam 372189251Ssamstatic struct wpabuf * wps_build_m7(struct wps_data *wps) 373189251Ssam{ 374189251Ssam struct wpabuf *msg, *plain; 375189251Ssam 376189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 377189251Ssam 378189251Ssam plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 379189251Ssam if (plain == NULL) 380189251Ssam return NULL; 381189251Ssam 382189251Ssam msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 383189251Ssam if (msg == NULL) { 384189251Ssam wpabuf_free(plain); 385189251Ssam return NULL; 386189251Ssam } 387189251Ssam 388189251Ssam if (wps_build_version(msg) || 389189251Ssam wps_build_msg_type(msg, WPS_M7) || 390189251Ssam wps_build_registrar_nonce(wps, msg) || 391189251Ssam wps_build_e_snonce2(wps, plain) || 392189251Ssam (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 393189251Ssam wps_build_key_wrap_auth(wps, plain) || 394189251Ssam wps_build_encr_settings(wps, msg, plain) || 395252726Srpaulo wps_build_wfa_ext(msg, 0, NULL, 0) || 396189251Ssam wps_build_authenticator(wps, msg)) { 397189251Ssam wpabuf_free(plain); 398189251Ssam wpabuf_free(msg); 399189251Ssam return NULL; 400189251Ssam } 401189251Ssam wpabuf_free(plain); 402189251Ssam 403214734Srpaulo if (wps->wps->ap && wps->wps->registrar) { 404214734Srpaulo /* 405214734Srpaulo * If the Registrar is only learning our current configuration, 406214734Srpaulo * it may not continue protocol run to successful completion. 407214734Srpaulo * Store information here to make sure it remains available. 408214734Srpaulo */ 409214734Srpaulo wps_device_store(wps->wps->registrar, &wps->peer_dev, 410214734Srpaulo wps->uuid_r); 411214734Srpaulo } 412214734Srpaulo 413189251Ssam wps->state = RECV_M8; 414189251Ssam return msg; 415189251Ssam} 416189251Ssam 417189251Ssam 418189251Ssamstatic struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 419189251Ssam{ 420189251Ssam struct wpabuf *msg; 421189251Ssam 422189251Ssam wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 423189251Ssam 424189251Ssam msg = wpabuf_alloc(1000); 425189251Ssam if (msg == NULL) 426189251Ssam return NULL; 427189251Ssam 428189251Ssam if (wps_build_version(msg) || 429189251Ssam wps_build_msg_type(msg, WPS_WSC_DONE) || 430189251Ssam wps_build_enrollee_nonce(wps, msg) || 431252726Srpaulo wps_build_registrar_nonce(wps, msg) || 432252726Srpaulo wps_build_wfa_ext(msg, 0, NULL, 0)) { 433189251Ssam wpabuf_free(msg); 434189251Ssam return NULL; 435189251Ssam } 436189251Ssam 437189251Ssam if (wps->wps->ap) 438189251Ssam wps->state = RECV_ACK; 439189251Ssam else { 440281806Srpaulo wps_success_event(wps->wps, wps->peer_dev.mac_addr); 441189251Ssam wps->state = WPS_FINISHED; 442189251Ssam } 443189251Ssam return msg; 444189251Ssam} 445189251Ssam 446189251Ssam 447189251Ssamstruct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 448189251Ssam enum wsc_op_code *op_code) 449189251Ssam{ 450189251Ssam struct wpabuf *msg; 451189251Ssam 452189251Ssam switch (wps->state) { 453189251Ssam case SEND_M1: 454189251Ssam msg = wps_build_m1(wps); 455189251Ssam *op_code = WSC_MSG; 456189251Ssam break; 457189251Ssam case SEND_M3: 458189251Ssam msg = wps_build_m3(wps); 459189251Ssam *op_code = WSC_MSG; 460189251Ssam break; 461189251Ssam case SEND_M5: 462189251Ssam msg = wps_build_m5(wps); 463189251Ssam *op_code = WSC_MSG; 464189251Ssam break; 465189251Ssam case SEND_M7: 466189251Ssam msg = wps_build_m7(wps); 467189251Ssam *op_code = WSC_MSG; 468189251Ssam break; 469189251Ssam case RECEIVED_M2D: 470189251Ssam if (wps->wps->ap) { 471189251Ssam msg = wps_build_wsc_nack(wps); 472189251Ssam *op_code = WSC_NACK; 473189251Ssam break; 474189251Ssam } 475189251Ssam msg = wps_build_wsc_ack(wps); 476189251Ssam *op_code = WSC_ACK; 477189251Ssam if (msg) { 478189251Ssam /* Another M2/M2D may be received */ 479189251Ssam wps->state = RECV_M2; 480189251Ssam } 481189251Ssam break; 482189251Ssam case SEND_WSC_NACK: 483189251Ssam msg = wps_build_wsc_nack(wps); 484189251Ssam *op_code = WSC_NACK; 485189251Ssam break; 486189251Ssam case WPS_MSG_DONE: 487189251Ssam msg = wps_build_wsc_done(wps); 488189251Ssam *op_code = WSC_Done; 489189251Ssam break; 490189251Ssam default: 491189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 492189251Ssam "a message", wps->state); 493189251Ssam msg = NULL; 494189251Ssam break; 495189251Ssam } 496189251Ssam 497189251Ssam if (*op_code == WSC_MSG && msg) { 498189251Ssam /* Save a copy of the last message for Authenticator derivation 499189251Ssam */ 500189251Ssam wpabuf_free(wps->last_msg); 501189251Ssam wps->last_msg = wpabuf_dup(msg); 502189251Ssam } 503189251Ssam 504189251Ssam return msg; 505189251Ssam} 506189251Ssam 507189251Ssam 508189251Ssamstatic int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 509189251Ssam{ 510189251Ssam if (r_nonce == NULL) { 511189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 512189251Ssam return -1; 513189251Ssam } 514189251Ssam 515189251Ssam os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 516189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 517189251Ssam wps->nonce_r, WPS_NONCE_LEN); 518189251Ssam 519189251Ssam return 0; 520189251Ssam} 521189251Ssam 522189251Ssam 523189251Ssamstatic int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 524189251Ssam{ 525189251Ssam if (e_nonce == NULL) { 526189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 527189251Ssam return -1; 528189251Ssam } 529189251Ssam 530189251Ssam if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 531189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 532189251Ssam return -1; 533189251Ssam } 534189251Ssam 535189251Ssam return 0; 536189251Ssam} 537189251Ssam 538189251Ssam 539189251Ssamstatic int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 540189251Ssam{ 541189251Ssam if (uuid_r == NULL) { 542189251Ssam wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 543189251Ssam return -1; 544189251Ssam } 545189251Ssam 546189251Ssam os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 547189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 548189251Ssam 549189251Ssam return 0; 550189251Ssam} 551189251Ssam 552189251Ssam 553189251Ssamstatic int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 554189251Ssam size_t pk_len) 555189251Ssam{ 556189251Ssam if (pk == NULL || pk_len == 0) { 557189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 558189251Ssam return -1; 559189251Ssam } 560189251Ssam 561281806Srpaulo if (wps->peer_pubkey_hash_set) { 562281806Srpaulo u8 hash[WPS_HASH_LEN]; 563281806Srpaulo sha256_vector(1, &pk, &pk_len, hash); 564281806Srpaulo if (os_memcmp_const(hash, wps->peer_pubkey_hash, 565281806Srpaulo WPS_OOB_PUBKEY_HASH_LEN) != 0) { 566281806Srpaulo wpa_printf(MSG_ERROR, "WPS: Public Key hash mismatch"); 567281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Received public key", 568281806Srpaulo pk, pk_len); 569281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Calculated public key " 570281806Srpaulo "hash", hash, WPS_OOB_PUBKEY_HASH_LEN); 571281806Srpaulo wpa_hexdump(MSG_DEBUG, "WPS: Expected public key hash", 572281806Srpaulo wps->peer_pubkey_hash, 573281806Srpaulo WPS_OOB_PUBKEY_HASH_LEN); 574281806Srpaulo wps->config_error = WPS_CFG_PUBLIC_KEY_HASH_MISMATCH; 575281806Srpaulo return -1; 576281806Srpaulo } 577281806Srpaulo } 578281806Srpaulo 579189251Ssam wpabuf_free(wps->dh_pubkey_r); 580189251Ssam wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 581189251Ssam if (wps->dh_pubkey_r == NULL) 582189251Ssam return -1; 583189251Ssam 584189251Ssam if (wps_derive_keys(wps) < 0) 585189251Ssam return -1; 586189251Ssam 587189251Ssam return 0; 588189251Ssam} 589189251Ssam 590189251Ssam 591189251Ssamstatic int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 592189251Ssam{ 593189251Ssam if (r_hash1 == NULL) { 594189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 595189251Ssam return -1; 596189251Ssam } 597189251Ssam 598189251Ssam os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 599189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 600189251Ssam 601189251Ssam return 0; 602189251Ssam} 603189251Ssam 604189251Ssam 605189251Ssamstatic int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 606189251Ssam{ 607189251Ssam if (r_hash2 == NULL) { 608189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 609189251Ssam return -1; 610189251Ssam } 611189251Ssam 612189251Ssam os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 613189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 614189251Ssam 615189251Ssam return 0; 616189251Ssam} 617189251Ssam 618189251Ssam 619189251Ssamstatic int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 620189251Ssam{ 621189251Ssam u8 hash[SHA256_MAC_LEN]; 622189251Ssam const u8 *addr[4]; 623189251Ssam size_t len[4]; 624189251Ssam 625189251Ssam if (r_snonce1 == NULL) { 626189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 627189251Ssam return -1; 628189251Ssam } 629189251Ssam 630189251Ssam wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 631189251Ssam WPS_SECRET_NONCE_LEN); 632189251Ssam 633189251Ssam /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 634189251Ssam addr[0] = r_snonce1; 635189251Ssam len[0] = WPS_SECRET_NONCE_LEN; 636189251Ssam addr[1] = wps->psk1; 637189251Ssam len[1] = WPS_PSK_LEN; 638189251Ssam addr[2] = wpabuf_head(wps->dh_pubkey_e); 639189251Ssam len[2] = wpabuf_len(wps->dh_pubkey_e); 640189251Ssam addr[3] = wpabuf_head(wps->dh_pubkey_r); 641189251Ssam len[3] = wpabuf_len(wps->dh_pubkey_r); 642189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 643189251Ssam 644281806Srpaulo if (os_memcmp_const(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 645189251Ssam wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 646189251Ssam "not match with the pre-committed value"); 647189251Ssam wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 648281806Srpaulo wps_pwd_auth_fail_event(wps->wps, 1, 1, wps->peer_dev.mac_addr); 649189251Ssam return -1; 650189251Ssam } 651189251Ssam 652189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 653189251Ssam "half of the device password"); 654189251Ssam 655189251Ssam return 0; 656189251Ssam} 657189251Ssam 658189251Ssam 659189251Ssamstatic int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 660189251Ssam{ 661189251Ssam u8 hash[SHA256_MAC_LEN]; 662189251Ssam const u8 *addr[4]; 663189251Ssam size_t len[4]; 664189251Ssam 665189251Ssam if (r_snonce2 == NULL) { 666189251Ssam wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 667189251Ssam return -1; 668189251Ssam } 669189251Ssam 670189251Ssam wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 671189251Ssam WPS_SECRET_NONCE_LEN); 672189251Ssam 673189251Ssam /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 674189251Ssam addr[0] = r_snonce2; 675189251Ssam len[0] = WPS_SECRET_NONCE_LEN; 676189251Ssam addr[1] = wps->psk2; 677189251Ssam len[1] = WPS_PSK_LEN; 678189251Ssam addr[2] = wpabuf_head(wps->dh_pubkey_e); 679189251Ssam len[2] = wpabuf_len(wps->dh_pubkey_e); 680189251Ssam addr[3] = wpabuf_head(wps->dh_pubkey_r); 681189251Ssam len[3] = wpabuf_len(wps->dh_pubkey_r); 682189251Ssam hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 683189251Ssam 684281806Srpaulo if (os_memcmp_const(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 685189251Ssam wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 686189251Ssam "not match with the pre-committed value"); 687189251Ssam wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 688281806Srpaulo wps_pwd_auth_fail_event(wps->wps, 1, 2, wps->peer_dev.mac_addr); 689189251Ssam return -1; 690189251Ssam } 691189251Ssam 692189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 693189251Ssam "half of the device password"); 694189251Ssam 695189251Ssam return 0; 696189251Ssam} 697189251Ssam 698189251Ssam 699189251Ssamstatic int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 700252726Srpaulo size_t cred_len, int wps2) 701189251Ssam{ 702189251Ssam struct wps_parse_attr attr; 703189251Ssam struct wpabuf msg; 704252726Srpaulo int ret = 0; 705189251Ssam 706189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 707189251Ssam os_memset(&wps->cred, 0, sizeof(wps->cred)); 708189251Ssam wpabuf_set(&msg, cred, cred_len); 709189251Ssam if (wps_parse_msg(&msg, &attr) < 0 || 710189251Ssam wps_process_cred(&attr, &wps->cred)) 711189251Ssam return -1; 712189251Ssam 713209158Srpaulo if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 714209158Srpaulo 0) { 715209158Srpaulo wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 716209158Srpaulo MACSTR ") does not match with own address (" MACSTR 717209158Srpaulo ")", MAC2STR(wps->cred.mac_addr), 718209158Srpaulo MAC2STR(wps->wps->dev.mac_addr)); 719209158Srpaulo /* 720209158Srpaulo * In theory, this could be consider fatal error, but there are 721209158Srpaulo * number of deployed implementations using other address here 722209158Srpaulo * due to unclarity in the specification. For interoperability 723209158Srpaulo * reasons, allow this to be processed since we do not really 724209158Srpaulo * use the MAC Address information for anything. 725209158Srpaulo */ 726252726Srpaulo#ifdef CONFIG_WPS_STRICT 727252726Srpaulo if (wps2) { 728252726Srpaulo wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 729252726Srpaulo "MAC Address in AP Settings"); 730252726Srpaulo return -1; 731252726Srpaulo } 732252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 733209158Srpaulo } 734209158Srpaulo 735252726Srpaulo if (!(wps->cred.encr_type & 736252726Srpaulo (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 737252726Srpaulo if (wps->cred.encr_type & WPS_ENCR_WEP) { 738252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject Credential " 739252726Srpaulo "due to WEP configuration"); 740252726Srpaulo wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 741252726Srpaulo return -2; 742252726Srpaulo } 743252726Srpaulo 744252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 745252726Srpaulo "invalid encr_type 0x%x", wps->cred.encr_type); 746252726Srpaulo return -1; 747252726Srpaulo } 748252726Srpaulo 749189251Ssam if (wps->wps->cred_cb) { 750189251Ssam wps->cred.cred_attr = cred - 4; 751189251Ssam wps->cred.cred_attr_len = cred_len + 4; 752252726Srpaulo ret = wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 753189251Ssam wps->cred.cred_attr = NULL; 754189251Ssam wps->cred.cred_attr_len = 0; 755189251Ssam } 756189251Ssam 757252726Srpaulo return ret; 758189251Ssam} 759189251Ssam 760189251Ssam 761189251Ssamstatic int wps_process_creds(struct wps_data *wps, const u8 *cred[], 762289549Srpaulo u16 cred_len[], unsigned int num_cred, int wps2) 763189251Ssam{ 764189251Ssam size_t i; 765252726Srpaulo int ok = 0; 766189251Ssam 767189251Ssam if (wps->wps->ap) 768189251Ssam return 0; 769189251Ssam 770189251Ssam if (num_cred == 0) { 771189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 772189251Ssam "received"); 773189251Ssam return -1; 774189251Ssam } 775189251Ssam 776189251Ssam for (i = 0; i < num_cred; i++) { 777252726Srpaulo int res; 778252726Srpaulo res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 779252726Srpaulo if (res == 0) 780252726Srpaulo ok++; 781252726Srpaulo else if (res == -2) 782252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 783252726Srpaulo else 784189251Ssam return -1; 785189251Ssam } 786189251Ssam 787252726Srpaulo if (ok == 0) { 788252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 789252726Srpaulo "received"); 790252726Srpaulo return -1; 791252726Srpaulo } 792252726Srpaulo 793189251Ssam return 0; 794189251Ssam} 795189251Ssam 796189251Ssam 797189251Ssamstatic int wps_process_ap_settings_e(struct wps_data *wps, 798189251Ssam struct wps_parse_attr *attr, 799252726Srpaulo struct wpabuf *attrs, int wps2) 800189251Ssam{ 801189251Ssam struct wps_credential cred; 802289549Srpaulo int ret = 0; 803189251Ssam 804189251Ssam if (!wps->wps->ap) 805189251Ssam return 0; 806189251Ssam 807189251Ssam if (wps_process_ap_settings(attr, &cred) < 0) 808189251Ssam return -1; 809189251Ssam 810189251Ssam wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 811189251Ssam "Registrar"); 812189251Ssam 813209158Srpaulo if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 814209158Srpaulo 0) { 815209158Srpaulo wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 816209158Srpaulo MACSTR ") does not match with own address (" MACSTR 817209158Srpaulo ")", MAC2STR(cred.mac_addr), 818209158Srpaulo MAC2STR(wps->wps->dev.mac_addr)); 819209158Srpaulo /* 820209158Srpaulo * In theory, this could be consider fatal error, but there are 821209158Srpaulo * number of deployed implementations using other address here 822209158Srpaulo * due to unclarity in the specification. For interoperability 823209158Srpaulo * reasons, allow this to be processed since we do not really 824209158Srpaulo * use the MAC Address information for anything. 825209158Srpaulo */ 826252726Srpaulo#ifdef CONFIG_WPS_STRICT 827252726Srpaulo if (wps2) { 828252726Srpaulo wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 829252726Srpaulo "MAC Address in AP Settings"); 830252726Srpaulo return -1; 831252726Srpaulo } 832252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 833209158Srpaulo } 834209158Srpaulo 835252726Srpaulo if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 836252726Srpaulo { 837252726Srpaulo if (cred.encr_type & WPS_ENCR_WEP) { 838252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 839252726Srpaulo "due to WEP configuration"); 840252726Srpaulo wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 841252726Srpaulo return -1; 842252726Srpaulo } 843252726Srpaulo 844252726Srpaulo wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 845252726Srpaulo "invalid encr_type 0x%x", cred.encr_type); 846252726Srpaulo return -1; 847252726Srpaulo } 848252726Srpaulo 849252726Srpaulo#ifdef CONFIG_WPS_STRICT 850252726Srpaulo if (wps2) { 851252726Srpaulo if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 852252726Srpaulo WPS_ENCR_TKIP || 853252726Srpaulo (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 854252726Srpaulo WPS_AUTH_WPAPSK) { 855252726Srpaulo wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 856252726Srpaulo "AP Settings: WPA-Personal/TKIP only"); 857252726Srpaulo wps->error_indication = 858252726Srpaulo WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 859252726Srpaulo return -1; 860252726Srpaulo } 861252726Srpaulo } 862252726Srpaulo#endif /* CONFIG_WPS_STRICT */ 863252726Srpaulo 864252726Srpaulo if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 865252726Srpaulo { 866252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 867252726Srpaulo "TKIP+AES"); 868252726Srpaulo cred.encr_type |= WPS_ENCR_AES; 869252726Srpaulo } 870252726Srpaulo 871252726Srpaulo if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 872252726Srpaulo WPS_AUTH_WPAPSK) { 873252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 874252726Srpaulo "WPAPSK+WPA2PSK"); 875252726Srpaulo cred.auth_type |= WPS_AUTH_WPA2PSK; 876252726Srpaulo } 877252726Srpaulo 878189251Ssam if (wps->wps->cred_cb) { 879189251Ssam cred.cred_attr = wpabuf_head(attrs); 880189251Ssam cred.cred_attr_len = wpabuf_len(attrs); 881289549Srpaulo ret = wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 882189251Ssam } 883189251Ssam 884289549Srpaulo return ret; 885189251Ssam} 886189251Ssam 887189251Ssam 888281806Srpaulostatic int wps_process_dev_pw_id(struct wps_data *wps, const u8 *dev_pw_id) 889281806Srpaulo{ 890281806Srpaulo u16 id; 891281806Srpaulo 892281806Srpaulo if (dev_pw_id == NULL) { 893281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Device Password ID"); 894281806Srpaulo return -1; 895281806Srpaulo } 896281806Srpaulo 897281806Srpaulo id = WPA_GET_BE16(dev_pw_id); 898281806Srpaulo if (wps->dev_pw_id == id) { 899281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Device Password ID %u", id); 900281806Srpaulo return 0; 901281806Srpaulo } 902281806Srpaulo 903281806Srpaulo#ifdef CONFIG_P2P 904281806Srpaulo if ((id == DEV_PW_DEFAULT && 905281806Srpaulo wps->dev_pw_id == DEV_PW_REGISTRAR_SPECIFIED) || 906281806Srpaulo (id == DEV_PW_REGISTRAR_SPECIFIED && 907281806Srpaulo wps->dev_pw_id == DEV_PW_DEFAULT)) { 908281806Srpaulo /* 909281806Srpaulo * Common P2P use cases indicate whether the PIN is from the 910281806Srpaulo * client or GO using Device Password Id in M1/M2 in a way that 911281806Srpaulo * does not look fully compliant with WSC specification. Anyway, 912281806Srpaulo * this is deployed and needs to be allowed, so ignore changes 913281806Srpaulo * between Registrar-Specified and Default PIN. 914281806Srpaulo */ 915281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Allow PIN Device Password ID " 916281806Srpaulo "change"); 917281806Srpaulo return 0; 918281806Srpaulo } 919281806Srpaulo#endif /* CONFIG_P2P */ 920281806Srpaulo 921281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Registrar trying to change Device Password " 922281806Srpaulo "ID from %u to %u", wps->dev_pw_id, id); 923281806Srpaulo 924281806Srpaulo if (wps->dev_pw_id == DEV_PW_PUSHBUTTON && id == DEV_PW_DEFAULT) { 925281806Srpaulo wpa_printf(MSG_DEBUG, 926281806Srpaulo "WPS: Workaround - ignore PBC-to-PIN change"); 927281806Srpaulo return 0; 928281806Srpaulo } 929281806Srpaulo 930281806Srpaulo if (wps->alt_dev_password && wps->alt_dev_pw_id == id) { 931281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Found a matching Device Password"); 932281806Srpaulo bin_clear_free(wps->dev_password, wps->dev_password_len); 933281806Srpaulo wps->dev_pw_id = wps->alt_dev_pw_id; 934281806Srpaulo wps->dev_password = wps->alt_dev_password; 935281806Srpaulo wps->dev_password_len = wps->alt_dev_password_len; 936281806Srpaulo wps->alt_dev_password = NULL; 937281806Srpaulo wps->alt_dev_password_len = 0; 938281806Srpaulo return 0; 939281806Srpaulo } 940281806Srpaulo 941281806Srpaulo return -1; 942281806Srpaulo} 943281806Srpaulo 944281806Srpaulo 945189251Ssamstatic enum wps_process_res wps_process_m2(struct wps_data *wps, 946189251Ssam const struct wpabuf *msg, 947189251Ssam struct wps_parse_attr *attr) 948189251Ssam{ 949189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M2"); 950189251Ssam 951189251Ssam if (wps->state != RECV_M2) { 952189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 953189251Ssam "receiving M2", wps->state); 954189251Ssam wps->state = SEND_WSC_NACK; 955189251Ssam return WPS_CONTINUE; 956189251Ssam } 957189251Ssam 958189251Ssam if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 959189251Ssam wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 960281806Srpaulo wps_process_uuid_r(wps, attr->uuid_r) || 961281806Srpaulo wps_process_dev_pw_id(wps, attr->dev_password_id)) { 962189251Ssam wps->state = SEND_WSC_NACK; 963189251Ssam return WPS_CONTINUE; 964189251Ssam } 965189251Ssam 966252726Srpaulo /* 967252726Srpaulo * Stop here on an AP as an Enrollee if AP Setup is locked unless the 968252726Srpaulo * special locked mode is used to allow protocol run up to M7 in order 969252726Srpaulo * to support external Registrars that only learn the current AP 970252726Srpaulo * configuration without changing it. 971252726Srpaulo */ 972214734Srpaulo if (wps->wps->ap && 973252726Srpaulo ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 974252726Srpaulo wps->dev_password == NULL)) { 975189251Ssam wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 976189251Ssam "registration of a new Registrar"); 977189251Ssam wps->config_error = WPS_CFG_SETUP_LOCKED; 978189251Ssam wps->state = SEND_WSC_NACK; 979189251Ssam return WPS_CONTINUE; 980189251Ssam } 981189251Ssam 982214734Srpaulo if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 983214734Srpaulo wps_process_authenticator(wps, attr->authenticator, msg) || 984214734Srpaulo wps_process_device_attrs(&wps->peer_dev, attr)) { 985214734Srpaulo wps->state = SEND_WSC_NACK; 986214734Srpaulo return WPS_CONTINUE; 987214734Srpaulo } 988214734Srpaulo 989281806Srpaulo#ifdef CONFIG_WPS_NFC 990281806Srpaulo if (wps->peer_pubkey_hash_set) { 991281806Srpaulo struct wpabuf *decrypted; 992281806Srpaulo struct wps_parse_attr eattr; 993281806Srpaulo 994281806Srpaulo decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 995281806Srpaulo attr->encr_settings_len); 996281806Srpaulo if (decrypted == NULL) { 997281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Failed to decrypt " 998281806Srpaulo "Encrypted Settings attribute"); 999281806Srpaulo wps->state = SEND_WSC_NACK; 1000281806Srpaulo return WPS_CONTINUE; 1001281806Srpaulo } 1002281806Srpaulo 1003281806Srpaulo wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted " 1004281806Srpaulo "Settings attribute"); 1005281806Srpaulo if (wps_parse_msg(decrypted, &eattr) < 0 || 1006281806Srpaulo wps_process_key_wrap_auth(wps, decrypted, 1007281806Srpaulo eattr.key_wrap_auth) || 1008281806Srpaulo wps_process_creds(wps, eattr.cred, eattr.cred_len, 1009281806Srpaulo eattr.num_cred, attr->version2 != NULL)) { 1010281806Srpaulo wpabuf_free(decrypted); 1011281806Srpaulo wps->state = SEND_WSC_NACK; 1012281806Srpaulo return WPS_CONTINUE; 1013281806Srpaulo } 1014281806Srpaulo wpabuf_free(decrypted); 1015281806Srpaulo 1016281806Srpaulo wps->state = WPS_MSG_DONE; 1017281806Srpaulo return WPS_CONTINUE; 1018281806Srpaulo } 1019281806Srpaulo#endif /* CONFIG_WPS_NFC */ 1020281806Srpaulo 1021189251Ssam wps->state = SEND_M3; 1022189251Ssam return WPS_CONTINUE; 1023189251Ssam} 1024189251Ssam 1025189251Ssam 1026189251Ssamstatic enum wps_process_res wps_process_m2d(struct wps_data *wps, 1027189251Ssam struct wps_parse_attr *attr) 1028189251Ssam{ 1029189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 1030189251Ssam 1031189251Ssam if (wps->state != RECV_M2) { 1032189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1033189251Ssam "receiving M2D", wps->state); 1034189251Ssam wps->state = SEND_WSC_NACK; 1035189251Ssam return WPS_CONTINUE; 1036189251Ssam } 1037189251Ssam 1038189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 1039189251Ssam attr->manufacturer, attr->manufacturer_len); 1040189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 1041189251Ssam attr->model_name, attr->model_name_len); 1042189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 1043189251Ssam attr->model_number, attr->model_number_len); 1044189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 1045189251Ssam attr->serial_number, attr->serial_number_len); 1046189251Ssam wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 1047189251Ssam attr->dev_name, attr->dev_name_len); 1048189251Ssam 1049189251Ssam if (wps->wps->event_cb) { 1050189251Ssam union wps_event_data data; 1051189251Ssam struct wps_event_m2d *m2d = &data.m2d; 1052189251Ssam os_memset(&data, 0, sizeof(data)); 1053189251Ssam if (attr->config_methods) 1054189251Ssam m2d->config_methods = 1055189251Ssam WPA_GET_BE16(attr->config_methods); 1056189251Ssam m2d->manufacturer = attr->manufacturer; 1057189251Ssam m2d->manufacturer_len = attr->manufacturer_len; 1058189251Ssam m2d->model_name = attr->model_name; 1059189251Ssam m2d->model_name_len = attr->model_name_len; 1060189251Ssam m2d->model_number = attr->model_number; 1061189251Ssam m2d->model_number_len = attr->model_number_len; 1062189251Ssam m2d->serial_number = attr->serial_number; 1063189251Ssam m2d->serial_number_len = attr->serial_number_len; 1064189251Ssam m2d->dev_name = attr->dev_name; 1065189251Ssam m2d->dev_name_len = attr->dev_name_len; 1066189251Ssam m2d->primary_dev_type = attr->primary_dev_type; 1067189251Ssam if (attr->config_error) 1068189251Ssam m2d->config_error = 1069189251Ssam WPA_GET_BE16(attr->config_error); 1070189251Ssam if (attr->dev_password_id) 1071189251Ssam m2d->dev_password_id = 1072189251Ssam WPA_GET_BE16(attr->dev_password_id); 1073189251Ssam wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 1074189251Ssam } 1075189251Ssam 1076189251Ssam wps->state = RECEIVED_M2D; 1077189251Ssam return WPS_CONTINUE; 1078189251Ssam} 1079189251Ssam 1080189251Ssam 1081189251Ssamstatic enum wps_process_res wps_process_m4(struct wps_data *wps, 1082189251Ssam const struct wpabuf *msg, 1083189251Ssam struct wps_parse_attr *attr) 1084189251Ssam{ 1085189251Ssam struct wpabuf *decrypted; 1086189251Ssam struct wps_parse_attr eattr; 1087189251Ssam 1088189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M4"); 1089189251Ssam 1090189251Ssam if (wps->state != RECV_M4) { 1091189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1092189251Ssam "receiving M4", wps->state); 1093189251Ssam wps->state = SEND_WSC_NACK; 1094189251Ssam return WPS_CONTINUE; 1095189251Ssam } 1096189251Ssam 1097189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1098189251Ssam wps_process_authenticator(wps, attr->authenticator, msg) || 1099189251Ssam wps_process_r_hash1(wps, attr->r_hash1) || 1100189251Ssam wps_process_r_hash2(wps, attr->r_hash2)) { 1101189251Ssam wps->state = SEND_WSC_NACK; 1102189251Ssam return WPS_CONTINUE; 1103189251Ssam } 1104189251Ssam 1105189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1106189251Ssam attr->encr_settings_len); 1107189251Ssam if (decrypted == NULL) { 1108189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1109189251Ssam "Settings attribute"); 1110189251Ssam wps->state = SEND_WSC_NACK; 1111189251Ssam return WPS_CONTINUE; 1112189251Ssam } 1113189251Ssam 1114252726Srpaulo if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) { 1115252726Srpaulo wpabuf_free(decrypted); 1116252726Srpaulo wps->state = SEND_WSC_NACK; 1117252726Srpaulo return WPS_CONTINUE; 1118252726Srpaulo } 1119252726Srpaulo 1120189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1121189251Ssam "attribute"); 1122189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1123189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1124189251Ssam wps_process_r_snonce1(wps, eattr.r_snonce1)) { 1125189251Ssam wpabuf_free(decrypted); 1126189251Ssam wps->state = SEND_WSC_NACK; 1127189251Ssam return WPS_CONTINUE; 1128189251Ssam } 1129189251Ssam wpabuf_free(decrypted); 1130189251Ssam 1131189251Ssam wps->state = SEND_M5; 1132189251Ssam return WPS_CONTINUE; 1133189251Ssam} 1134189251Ssam 1135189251Ssam 1136189251Ssamstatic enum wps_process_res wps_process_m6(struct wps_data *wps, 1137189251Ssam const struct wpabuf *msg, 1138189251Ssam struct wps_parse_attr *attr) 1139189251Ssam{ 1140189251Ssam struct wpabuf *decrypted; 1141189251Ssam struct wps_parse_attr eattr; 1142189251Ssam 1143189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1144189251Ssam 1145189251Ssam if (wps->state != RECV_M6) { 1146189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1147189251Ssam "receiving M6", wps->state); 1148189251Ssam wps->state = SEND_WSC_NACK; 1149189251Ssam return WPS_CONTINUE; 1150189251Ssam } 1151189251Ssam 1152189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1153189251Ssam wps_process_authenticator(wps, attr->authenticator, msg)) { 1154189251Ssam wps->state = SEND_WSC_NACK; 1155189251Ssam return WPS_CONTINUE; 1156189251Ssam } 1157189251Ssam 1158189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1159189251Ssam attr->encr_settings_len); 1160189251Ssam if (decrypted == NULL) { 1161189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1162189251Ssam "Settings attribute"); 1163189251Ssam wps->state = SEND_WSC_NACK; 1164189251Ssam return WPS_CONTINUE; 1165189251Ssam } 1166189251Ssam 1167252726Srpaulo if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) { 1168252726Srpaulo wpabuf_free(decrypted); 1169252726Srpaulo wps->state = SEND_WSC_NACK; 1170252726Srpaulo return WPS_CONTINUE; 1171252726Srpaulo } 1172252726Srpaulo 1173189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1174189251Ssam "attribute"); 1175189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1176189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1177189251Ssam wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1178189251Ssam wpabuf_free(decrypted); 1179189251Ssam wps->state = SEND_WSC_NACK; 1180189251Ssam return WPS_CONTINUE; 1181189251Ssam } 1182189251Ssam wpabuf_free(decrypted); 1183189251Ssam 1184252726Srpaulo if (wps->wps->ap) 1185252726Srpaulo wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS, 1186252726Srpaulo NULL); 1187252726Srpaulo 1188189251Ssam wps->state = SEND_M7; 1189189251Ssam return WPS_CONTINUE; 1190189251Ssam} 1191189251Ssam 1192189251Ssam 1193189251Ssamstatic enum wps_process_res wps_process_m8(struct wps_data *wps, 1194189251Ssam const struct wpabuf *msg, 1195189251Ssam struct wps_parse_attr *attr) 1196189251Ssam{ 1197189251Ssam struct wpabuf *decrypted; 1198189251Ssam struct wps_parse_attr eattr; 1199189251Ssam 1200189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1201189251Ssam 1202189251Ssam if (wps->state != RECV_M8) { 1203189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1204189251Ssam "receiving M8", wps->state); 1205189251Ssam wps->state = SEND_WSC_NACK; 1206189251Ssam return WPS_CONTINUE; 1207189251Ssam } 1208189251Ssam 1209189251Ssam if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1210189251Ssam wps_process_authenticator(wps, attr->authenticator, msg)) { 1211189251Ssam wps->state = SEND_WSC_NACK; 1212189251Ssam return WPS_CONTINUE; 1213189251Ssam } 1214189251Ssam 1215252726Srpaulo if (wps->wps->ap && wps->wps->ap_setup_locked) { 1216252726Srpaulo /* 1217252726Srpaulo * Stop here if special ap_setup_locked == 2 mode allowed the 1218252726Srpaulo * protocol to continue beyond M2. This allows ER to learn the 1219252726Srpaulo * current AP settings without changing them. 1220252726Srpaulo */ 1221252726Srpaulo wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1222252726Srpaulo "registration of a new Registrar"); 1223252726Srpaulo wps->config_error = WPS_CFG_SETUP_LOCKED; 1224252726Srpaulo wps->state = SEND_WSC_NACK; 1225252726Srpaulo return WPS_CONTINUE; 1226252726Srpaulo } 1227252726Srpaulo 1228189251Ssam decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1229189251Ssam attr->encr_settings_len); 1230189251Ssam if (decrypted == NULL) { 1231189251Ssam wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1232189251Ssam "Settings attribute"); 1233189251Ssam wps->state = SEND_WSC_NACK; 1234189251Ssam return WPS_CONTINUE; 1235189251Ssam } 1236189251Ssam 1237252726Srpaulo if (wps_validate_m8_encr(decrypted, wps->wps->ap, 1238252726Srpaulo attr->version2 != NULL) < 0) { 1239252726Srpaulo wpabuf_free(decrypted); 1240252726Srpaulo wps->state = SEND_WSC_NACK; 1241252726Srpaulo return WPS_CONTINUE; 1242252726Srpaulo } 1243252726Srpaulo 1244189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1245189251Ssam "attribute"); 1246189251Ssam if (wps_parse_msg(decrypted, &eattr) < 0 || 1247189251Ssam wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1248189251Ssam wps_process_creds(wps, eattr.cred, eattr.cred_len, 1249252726Srpaulo eattr.num_cred, attr->version2 != NULL) || 1250252726Srpaulo wps_process_ap_settings_e(wps, &eattr, decrypted, 1251252726Srpaulo attr->version2 != NULL)) { 1252189251Ssam wpabuf_free(decrypted); 1253189251Ssam wps->state = SEND_WSC_NACK; 1254189251Ssam return WPS_CONTINUE; 1255189251Ssam } 1256189251Ssam wpabuf_free(decrypted); 1257189251Ssam 1258189251Ssam wps->state = WPS_MSG_DONE; 1259189251Ssam return WPS_CONTINUE; 1260189251Ssam} 1261189251Ssam 1262189251Ssam 1263189251Ssamstatic enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1264189251Ssam const struct wpabuf *msg) 1265189251Ssam{ 1266189251Ssam struct wps_parse_attr attr; 1267189251Ssam enum wps_process_res ret = WPS_CONTINUE; 1268189251Ssam 1269189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1270189251Ssam 1271189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1272189251Ssam return WPS_FAILURE; 1273189251Ssam 1274189251Ssam if (attr.enrollee_nonce == NULL || 1275252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1276189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1277189251Ssam return WPS_FAILURE; 1278189251Ssam } 1279189251Ssam 1280189251Ssam if (attr.msg_type == NULL) { 1281189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1282252726Srpaulo wps->state = SEND_WSC_NACK; 1283252726Srpaulo return WPS_CONTINUE; 1284189251Ssam } 1285189251Ssam 1286189251Ssam switch (*attr.msg_type) { 1287189251Ssam case WPS_M2: 1288252726Srpaulo if (wps_validate_m2(msg) < 0) 1289252726Srpaulo return WPS_FAILURE; 1290189251Ssam ret = wps_process_m2(wps, msg, &attr); 1291189251Ssam break; 1292189251Ssam case WPS_M2D: 1293252726Srpaulo if (wps_validate_m2d(msg) < 0) 1294252726Srpaulo return WPS_FAILURE; 1295189251Ssam ret = wps_process_m2d(wps, &attr); 1296189251Ssam break; 1297189251Ssam case WPS_M4: 1298252726Srpaulo if (wps_validate_m4(msg) < 0) 1299252726Srpaulo return WPS_FAILURE; 1300189251Ssam ret = wps_process_m4(wps, msg, &attr); 1301189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1302252726Srpaulo wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1303281806Srpaulo wps->error_indication, 1304281806Srpaulo wps->peer_dev.mac_addr); 1305189251Ssam break; 1306189251Ssam case WPS_M6: 1307252726Srpaulo if (wps_validate_m6(msg) < 0) 1308252726Srpaulo return WPS_FAILURE; 1309189251Ssam ret = wps_process_m6(wps, msg, &attr); 1310189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1311252726Srpaulo wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1312281806Srpaulo wps->error_indication, 1313281806Srpaulo wps->peer_dev.mac_addr); 1314189251Ssam break; 1315189251Ssam case WPS_M8: 1316252726Srpaulo if (wps_validate_m8(msg) < 0) 1317252726Srpaulo return WPS_FAILURE; 1318189251Ssam ret = wps_process_m8(wps, msg, &attr); 1319189251Ssam if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1320252726Srpaulo wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1321281806Srpaulo wps->error_indication, 1322281806Srpaulo wps->peer_dev.mac_addr); 1323189251Ssam break; 1324189251Ssam default: 1325189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1326189251Ssam *attr.msg_type); 1327189251Ssam return WPS_FAILURE; 1328189251Ssam } 1329189251Ssam 1330189251Ssam /* 1331189251Ssam * Save a copy of the last message for Authenticator derivation if we 1332189251Ssam * are continuing. However, skip M2D since it is not authenticated and 1333189251Ssam * neither is the ACK/NACK response frame. This allows the possibly 1334189251Ssam * following M2 to be processed correctly by using the previously sent 1335189251Ssam * M1 in Authenticator derivation. 1336189251Ssam */ 1337189251Ssam if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1338189251Ssam /* Save a copy of the last message for Authenticator derivation 1339189251Ssam */ 1340189251Ssam wpabuf_free(wps->last_msg); 1341189251Ssam wps->last_msg = wpabuf_dup(msg); 1342189251Ssam } 1343189251Ssam 1344189251Ssam return ret; 1345189251Ssam} 1346189251Ssam 1347189251Ssam 1348189251Ssamstatic enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1349189251Ssam const struct wpabuf *msg) 1350189251Ssam{ 1351189251Ssam struct wps_parse_attr attr; 1352189251Ssam 1353189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1354189251Ssam 1355189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1356189251Ssam return WPS_FAILURE; 1357189251Ssam 1358189251Ssam if (attr.msg_type == NULL) { 1359189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1360189251Ssam return WPS_FAILURE; 1361189251Ssam } 1362189251Ssam 1363189251Ssam if (*attr.msg_type != WPS_WSC_ACK) { 1364189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1365189251Ssam *attr.msg_type); 1366189251Ssam return WPS_FAILURE; 1367189251Ssam } 1368189251Ssam 1369189251Ssam if (attr.registrar_nonce == NULL || 1370252726Srpaulo os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1371189251Ssam { 1372189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1373189251Ssam return WPS_FAILURE; 1374189251Ssam } 1375189251Ssam 1376189251Ssam if (attr.enrollee_nonce == NULL || 1377252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1378189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1379189251Ssam return WPS_FAILURE; 1380189251Ssam } 1381189251Ssam 1382189251Ssam if (wps->state == RECV_ACK && wps->wps->ap) { 1383189251Ssam wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1384189251Ssam "completed successfully"); 1385281806Srpaulo wps_success_event(wps->wps, wps->peer_dev.mac_addr); 1386189251Ssam wps->state = WPS_FINISHED; 1387189251Ssam return WPS_DONE; 1388189251Ssam } 1389189251Ssam 1390189251Ssam return WPS_FAILURE; 1391189251Ssam} 1392189251Ssam 1393189251Ssam 1394189251Ssamstatic enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1395189251Ssam const struct wpabuf *msg) 1396189251Ssam{ 1397189251Ssam struct wps_parse_attr attr; 1398252726Srpaulo u16 config_error; 1399189251Ssam 1400189251Ssam wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1401189251Ssam 1402189251Ssam if (wps_parse_msg(msg, &attr) < 0) 1403189251Ssam return WPS_FAILURE; 1404189251Ssam 1405189251Ssam if (attr.msg_type == NULL) { 1406189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1407189251Ssam return WPS_FAILURE; 1408189251Ssam } 1409189251Ssam 1410189251Ssam if (*attr.msg_type != WPS_WSC_NACK) { 1411189251Ssam wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1412189251Ssam *attr.msg_type); 1413189251Ssam return WPS_FAILURE; 1414189251Ssam } 1415189251Ssam 1416189251Ssam if (attr.registrar_nonce == NULL || 1417252726Srpaulo os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN) != 0) 1418189251Ssam { 1419189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1420189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1421189251Ssam attr.registrar_nonce, WPS_NONCE_LEN); 1422189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1423189251Ssam wps->nonce_r, WPS_NONCE_LEN); 1424189251Ssam return WPS_FAILURE; 1425189251Ssam } 1426189251Ssam 1427189251Ssam if (attr.enrollee_nonce == NULL || 1428252726Srpaulo os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN) != 0) { 1429189251Ssam wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1430189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1431189251Ssam attr.enrollee_nonce, WPS_NONCE_LEN); 1432189251Ssam wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1433189251Ssam wps->nonce_e, WPS_NONCE_LEN); 1434189251Ssam return WPS_FAILURE; 1435189251Ssam } 1436189251Ssam 1437189251Ssam if (attr.config_error == NULL) { 1438189251Ssam wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1439189251Ssam "in WSC_NACK"); 1440189251Ssam return WPS_FAILURE; 1441189251Ssam } 1442189251Ssam 1443252726Srpaulo config_error = WPA_GET_BE16(attr.config_error); 1444189251Ssam wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1445252726Srpaulo "Configuration Error %d", config_error); 1446189251Ssam 1447189251Ssam switch (wps->state) { 1448189251Ssam case RECV_M4: 1449252726Srpaulo wps_fail_event(wps->wps, WPS_M3, config_error, 1450281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1451189251Ssam break; 1452189251Ssam case RECV_M6: 1453252726Srpaulo wps_fail_event(wps->wps, WPS_M5, config_error, 1454281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1455189251Ssam break; 1456189251Ssam case RECV_M8: 1457252726Srpaulo wps_fail_event(wps->wps, WPS_M7, config_error, 1458281806Srpaulo wps->error_indication, wps->peer_dev.mac_addr); 1459189251Ssam break; 1460189251Ssam default: 1461189251Ssam break; 1462189251Ssam } 1463189251Ssam 1464189251Ssam /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1465189251Ssam * Enrollee is Authenticator */ 1466189251Ssam wps->state = SEND_WSC_NACK; 1467189251Ssam 1468189251Ssam return WPS_FAILURE; 1469189251Ssam} 1470189251Ssam 1471189251Ssam 1472189251Ssamenum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1473189251Ssam enum wsc_op_code op_code, 1474189251Ssam const struct wpabuf *msg) 1475189251Ssam{ 1476189251Ssam 1477189251Ssam wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1478189251Ssam "op_code=%d)", 1479189251Ssam (unsigned long) wpabuf_len(msg), op_code); 1480189251Ssam 1481209158Srpaulo if (op_code == WSC_UPnP) { 1482209158Srpaulo /* Determine the OpCode based on message type attribute */ 1483209158Srpaulo struct wps_parse_attr attr; 1484209158Srpaulo if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1485209158Srpaulo if (*attr.msg_type == WPS_WSC_ACK) 1486209158Srpaulo op_code = WSC_ACK; 1487209158Srpaulo else if (*attr.msg_type == WPS_WSC_NACK) 1488209158Srpaulo op_code = WSC_NACK; 1489209158Srpaulo } 1490209158Srpaulo } 1491209158Srpaulo 1492189251Ssam switch (op_code) { 1493189251Ssam case WSC_MSG: 1494189251Ssam case WSC_UPnP: 1495189251Ssam return wps_process_wsc_msg(wps, msg); 1496189251Ssam case WSC_ACK: 1497252726Srpaulo if (wps_validate_wsc_ack(msg) < 0) 1498252726Srpaulo return WPS_FAILURE; 1499189251Ssam return wps_process_wsc_ack(wps, msg); 1500189251Ssam case WSC_NACK: 1501252726Srpaulo if (wps_validate_wsc_nack(msg) < 0) 1502252726Srpaulo return WPS_FAILURE; 1503189251Ssam return wps_process_wsc_nack(wps, msg); 1504189251Ssam default: 1505189251Ssam wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1506189251Ssam return WPS_FAILURE; 1507189251Ssam } 1508189251Ssam} 1509