/*
* Wi-Fi Protected Setup - Enrollee
* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/crypto.h"
#include "crypto/sha256.h"
#include "crypto/random.h"
#include "wps_i.h"
#include "wps_dev_attr.h"
static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * MAC Address");
wpabuf_put_be16(msg, ATTR_MAC_ADDR);
wpabuf_put_be16(msg, ETH_ALEN);
wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN);
return 0;
}
static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg)
{
u8 state;
if (wps->wps->ap)
state = wps->wps->wps_state;
else
state = WPS_STATE_NOT_CONFIGURED;
wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)",
state);
wpabuf_put_be16(msg, ATTR_WPS_STATE);
wpabuf_put_be16(msg, 1);
wpabuf_put_u8(msg, state);
return 0;
}
static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg)
{
u8 *hash;
const u8 *addr[4];
size_t len[4];
if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0)
return -1;
wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: E-S2",
wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN);
if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) {
wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for "
"E-Hash derivation");
return -1;
}
wpa_printf(MSG_DEBUG, "WPS: * E-Hash1");
wpabuf_put_be16(msg, ATTR_E_HASH1);
wpabuf_put_be16(msg, SHA256_MAC_LEN);
hash = wpabuf_put(msg, SHA256_MAC_LEN);
/* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */
addr[0] = wps->snonce;
len[0] = WPS_SECRET_NONCE_LEN;
addr[1] = wps->psk1;
len[1] = WPS_PSK_LEN;
addr[2] = wpabuf_head(wps->dh_pubkey_e);
len[2] = wpabuf_len(wps->dh_pubkey_e);
addr[3] = wpabuf_head(wps->dh_pubkey_r);
len[3] = wpabuf_len(wps->dh_pubkey_r);
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN);
wpa_printf(MSG_DEBUG, "WPS: * E-Hash2");
wpabuf_put_be16(msg, ATTR_E_HASH2);
wpabuf_put_be16(msg, SHA256_MAC_LEN);
hash = wpabuf_put(msg, SHA256_MAC_LEN);
/* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */
addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN;
addr[1] = wps->psk2;
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN);
return 0;
}
static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1");
wpabuf_put_be16(msg, ATTR_E_SNONCE1);
wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN);
return 0;
}
static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2");
wpabuf_put_be16(msg, ATTR_E_SNONCE2);
wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN);
wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN,
WPS_SECRET_NONCE_LEN);
return 0;
}
static struct wpabuf * wps_build_m1(struct wps_data *wps)
{
struct wpabuf *msg;
u16 config_methods;
if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0)
return NULL;
wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce",
wps->nonce_e, WPS_NONCE_LEN);
wpa_printf(MSG_DEBUG, "WPS: Building Message M1");
msg = wpabuf_alloc(1000);
if (msg == NULL)
return NULL;
config_methods = wps->wps->config_methods;
if (wps->wps->ap && !wps->pbc_in_m1 &&
(wps->dev_password_len != 0 ||
(config_methods & WPS_CONFIG_DISPLAY))) {
/*
* These are the methods that the AP supports as an Enrollee
* for adding external Registrars, so remove PushButton.
*
* As a workaround for Windows 7 mechanism for probing WPS
* capabilities from M1, leave PushButton option if no PIN
* method is available or if WPS configuration enables PBC
* workaround.
*/
config_methods &= ~WPS_CONFIG_PUSHBUTTON;
#ifdef CONFIG_WPS2
config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON |
WPS_CONFIG_PHY_PUSHBUTTON);
#endif /* CONFIG_WPS2 */
}
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_M1) ||
wps_build_uuid_e(msg, wps->uuid_e) ||
wps_build_mac_addr(wps, msg) ||
wps_build_enrollee_nonce(wps, msg) ||
wps_build_public_key(wps, msg) ||
wps_build_auth_type_flags(wps, msg) ||
wps_build_encr_type_flags(wps, msg) ||
wps_build_conn_type_flags(wps, msg) ||
wps_build_config_methods(msg, config_methods) ||
wps_build_wps_state(wps, msg) ||
wps_build_device_attrs(&wps->wps->dev, msg) ||
wps_build_rf_bands(&wps->wps->dev, msg) ||
wps_build_assoc_state(wps, msg) ||
wps_build_dev_password_id(msg, wps->dev_pw_id) ||
wps_build_config_error(msg, WPS_CFG_NO_ERROR) ||
wps_build_os_version(&wps->wps->dev, msg) ||
wps_build_wfa_ext(msg, 0, NULL, 0)) {
wpabuf_free(msg);
return NULL;
}
wps->state = RECV_M2;
return msg;
}
static struct wpabuf * wps_build_m3(struct wps_data *wps)
{
struct wpabuf *msg;
wpa_printf(MSG_DEBUG, "WPS: Building Message M3");
if (wps->dev_password == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Device Password available");
return NULL;
}
wps_derive_psk(wps, wps->dev_password, wps->dev_password_len);
msg = wpabuf_alloc(1000);
if (msg == NULL)
return NULL;
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_M3) ||
wps_build_registrar_nonce(wps, msg) ||
wps_build_e_hash(wps, msg) ||
wps_build_wfa_ext(msg, 0, NULL, 0) ||
wps_build_authenticator(wps, msg)) {
wpabuf_free(msg);
return NULL;
}
wps->state = RECV_M4;
return msg;
}
static struct wpabuf * wps_build_m5(struct wps_data *wps)
{
struct wpabuf *msg, *plain;
wpa_printf(MSG_DEBUG, "WPS: Building Message M5");
plain = wpabuf_alloc(200);
if (plain == NULL)
return NULL;
msg = wpabuf_alloc(1000);
if (msg == NULL) {
wpabuf_free(plain);
return NULL;
}
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_M5) ||
wps_build_registrar_nonce(wps, msg) ||
wps_build_e_snonce1(wps, plain) ||
wps_build_key_wrap_auth(wps, plain) ||
wps_build_encr_settings(wps, msg, plain) ||
wps_build_wfa_ext(msg, 0, NULL, 0) ||
wps_build_authenticator(wps, msg)) {
wpabuf_free(plain);
wpabuf_free(msg);
return NULL;
}
wpabuf_free(plain);
wps->state = RECV_M6;
return msg;
}
static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * SSID");
wpabuf_put_be16(msg, ATTR_SSID);
wpabuf_put_be16(msg, wps->wps->ssid_len);
wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len);
return 0;
}
static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
{
u16 auth_type = wps->wps->auth_types;
/* Select the best authentication type */
if (auth_type & WPS_AUTH_WPA2PSK)
auth_type = WPS_AUTH_WPA2PSK;
else if (auth_type & WPS_AUTH_WPAPSK)
auth_type = WPS_AUTH_WPAPSK;
else if (auth_type & WPS_AUTH_OPEN)
auth_type = WPS_AUTH_OPEN;
else if (auth_type & WPS_AUTH_SHARED)
auth_type = WPS_AUTH_SHARED;
wpa_printf(MSG_DEBUG, "WPS: * Authentication Type (0x%x)", auth_type);
wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
wpabuf_put_be16(msg, 2);
wpabuf_put_be16(msg, auth_type);
return 0;
}
static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
{
u16 encr_type = wps->wps->encr_types;
/* Select the best encryption type */
if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) {
if (encr_type & WPS_ENCR_AES)
encr_type = WPS_ENCR_AES;
else if (encr_type & WPS_ENCR_TKIP)
encr_type = WPS_ENCR_TKIP;
} else {
if (encr_type & WPS_ENCR_WEP)
encr_type = WPS_ENCR_WEP;
else if (encr_type & WPS_ENCR_NONE)
encr_type = WPS_ENCR_NONE;
}
wpa_printf(MSG_DEBUG, "WPS: * Encryption Type (0x%x)", encr_type);
wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
wpabuf_put_be16(msg, 2);
wpabuf_put_be16(msg, encr_type);
return 0;
}
static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * Network Key");
wpabuf_put_be16(msg, ATTR_NETWORK_KEY);
wpabuf_put_be16(msg, wps->wps->network_key_len);
wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len);
return 0;
}
static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)");
wpabuf_put_be16(msg, ATTR_MAC_ADDR);
wpabuf_put_be16(msg, ETH_ALEN);
wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN);
return 0;
}
static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain)
{
if (wps->wps->ap_settings) {
wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)");
wpabuf_put_data(plain, wps->wps->ap_settings,
wps->wps->ap_settings_len);
return 0;
}
return wps_build_cred_ssid(wps, plain) ||
wps_build_cred_mac_addr(wps, plain) ||
wps_build_cred_auth_type(wps, plain) ||
wps_build_cred_encr_type(wps, plain) ||
wps_build_cred_network_key(wps, plain);
}
static struct wpabuf * wps_build_m7(struct wps_data *wps)
{
struct wpabuf *msg, *plain;
wpa_printf(MSG_DEBUG, "WPS: Building Message M7");
plain = wpabuf_alloc(500 + wps->wps->ap_settings_len);
if (plain == NULL)
return NULL;
msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len);
if (msg == NULL) {
wpabuf_free(plain);
return NULL;
}
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_M7) ||
wps_build_registrar_nonce(wps, msg) ||
wps_build_e_snonce2(wps, plain) ||
(wps->wps->ap && wps_build_ap_settings(wps, plain)) ||
wps_build_key_wrap_auth(wps, plain) ||
wps_build_encr_settings(wps, msg, plain) ||
wps_build_wfa_ext(msg, 0, NULL, 0) ||
wps_build_authenticator(wps, msg)) {
wpabuf_free(plain);
wpabuf_free(msg);
return NULL;
}
wpabuf_free(plain);
if (wps->wps->ap && wps->wps->registrar) {
/*
* If the Registrar is only learning our current configuration,
* it may not continue protocol run to successful completion.
* Store information here to make sure it remains available.
*/
wps_device_store(wps->wps->registrar, &wps->peer_dev,
wps->uuid_r);
}
wps->state = RECV_M8;
return msg;
}
static struct wpabuf * wps_build_wsc_done(struct wps_data *wps)
{
struct wpabuf *msg;
wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done");
msg = wpabuf_alloc(1000);
if (msg == NULL)
return NULL;
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_WSC_DONE) ||
wps_build_enrollee_nonce(wps, msg) ||
wps_build_registrar_nonce(wps, msg) ||
wps_build_wfa_ext(msg, 0, NULL, 0)) {
wpabuf_free(msg);
return NULL;
}
if (wps->wps->ap)
wps->state = RECV_ACK;
else {
wps_success_event(wps->wps);
wps->state = WPS_FINISHED;
}
return msg;
}
struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps,
enum wsc_op_code *op_code)
{
struct wpabuf *msg;
switch (wps->state) {
case SEND_M1:
msg = wps_build_m1(wps);
*op_code = WSC_MSG;
break;
case SEND_M3:
msg = wps_build_m3(wps);
*op_code = WSC_MSG;
break;
case SEND_M5:
msg = wps_build_m5(wps);
*op_code = WSC_MSG;
break;
case SEND_M7:
msg = wps_build_m7(wps);
*op_code = WSC_MSG;
break;
case RECEIVED_M2D:
if (wps->wps->ap) {
msg = wps_build_wsc_nack(wps);
*op_code = WSC_NACK;
break;
}
msg = wps_build_wsc_ack(wps);
*op_code = WSC_ACK;
if (msg) {
/* Another M2/M2D may be received */
wps->state = RECV_M2;
}
break;
case SEND_WSC_NACK:
msg = wps_build_wsc_nack(wps);
*op_code = WSC_NACK;
break;
case WPS_MSG_DONE:
msg = wps_build_wsc_done(wps);
*op_code = WSC_Done;
break;
default:
wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building "
"a message", wps->state);
msg = NULL;
break;
}
if (*op_code == WSC_MSG && msg) {
/* Save a copy of the last message for Authenticator derivation
*/
wpabuf_free(wps->last_msg);
wps->last_msg = wpabuf_dup(msg);
}
return msg;
}
static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce)
{
if (r_nonce == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received");
return -1;
}
os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce",
wps->nonce_r, WPS_NONCE_LEN);
return 0;
}
static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce)
{
if (e_nonce == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received");
return -1;
}
if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received");
return -1;
}
return 0;
}
static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r)
{
if (uuid_r == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No UUID-R received");
return -1;
}
os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN);
return 0;
}
static int wps_process_pubkey(struct wps_data *wps, const u8 *pk,
size_t pk_len)
{
if (pk == NULL || pk_len == 0) {
wpa_printf(MSG_DEBUG, "WPS: No Public Key received");
return -1;
}
#ifdef CONFIG_WPS_OOB
if (wps->dev_pw_id != DEV_PW_DEFAULT &&
wps->wps->oob_conf.pubkey_hash) {
const u8 *addr[1];
u8 hash[WPS_HASH_LEN];
addr[0] = pk;
sha256_vector(1, addr, &pk_len, hash);
if (os_memcmp(hash,
wpabuf_head(wps->wps->oob_conf.pubkey_hash),
WPS_OOB_PUBKEY_HASH_LEN) != 0) {
wpa_printf(MSG_ERROR, "WPS: Public Key hash error");
return -1;
}
}
#endif /* CONFIG_WPS_OOB */
wpabuf_free(wps->dh_pubkey_r);
wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len);
if (wps->dh_pubkey_r == NULL)
return -1;
if (wps_derive_keys(wps) < 0)
return -1;
return 0;
}
static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1)
{
if (r_hash1 == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received");
return -1;
}
os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN);
return 0;
}
static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2)
{
if (r_hash2 == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received");
return -1;
}
os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN);
return 0;
}
static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1)
{
u8 hash[SHA256_MAC_LEN];
const u8 *addr[4];
size_t len[4];
if (r_snonce1 == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1,
WPS_SECRET_NONCE_LEN);
/* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */
addr[0] = r_snonce1;
len[0] = WPS_SECRET_NONCE_LEN;
addr[1] = wps->psk1;
len[1] = WPS_PSK_LEN;
addr[2] = wpabuf_head(wps->dh_pubkey_e);
len[2] = wpabuf_len(wps->dh_pubkey_e);
addr[3] = wpabuf_head(wps->dh_pubkey_r);
len[3] = wpabuf_len(wps->dh_pubkey_r);
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) {
wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does "
"not match with the pre-committed value");
wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
wps_pwd_auth_fail_event(wps->wps, 1, 1);
return -1;
}
wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first "
"half of the device password");
return 0;
}
static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2)
{
u8 hash[SHA256_MAC_LEN];
const u8 *addr[4];
size_t len[4];
if (r_snonce2 == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2,
WPS_SECRET_NONCE_LEN);
/* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */
addr[0] = r_snonce2;
len[0] = WPS_SECRET_NONCE_LEN;
addr[1] = wps->psk2;
len[1] = WPS_PSK_LEN;
addr[2] = wpabuf_head(wps->dh_pubkey_e);
len[2] = wpabuf_len(wps->dh_pubkey_e);
addr[3] = wpabuf_head(wps->dh_pubkey_r);
len[3] = wpabuf_len(wps->dh_pubkey_r);
hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash);
if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) {
wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does "
"not match with the pre-committed value");
wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE;
wps_pwd_auth_fail_event(wps->wps, 1, 2);
return -1;
}
wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second "
"half of the device password");
return 0;
}
static int wps_process_cred_e(struct wps_data *wps, const u8 *cred,
size_t cred_len, int wps2)
{
struct wps_parse_attr attr;
struct wpabuf msg;
wpa_printf(MSG_DEBUG, "WPS: Received Credential");
os_memset(&wps->cred, 0, sizeof(wps->cred));
wpabuf_set(&msg, cred, cred_len);
if (wps_parse_msg(&msg, &attr) < 0 ||
wps_process_cred(&attr, &wps->cred))
return -1;
if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
0) {
wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential ("
MACSTR ") does not match with own address (" MACSTR
")", MAC2STR(wps->cred.mac_addr),
MAC2STR(wps->wps->dev.mac_addr));
/*
* In theory, this could be consider fatal error, but there are
* number of deployed implementations using other address here
* due to unclarity in the specification. For interoperability
* reasons, allow this to be processed since we do not really
* use the MAC Address information for anything.
*/
#ifdef CONFIG_WPS_STRICT
if (wps2) {
wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
"MAC Address in AP Settings");
return -1;
}
#endif /* CONFIG_WPS_STRICT */
}
#ifdef CONFIG_WPS2
if (!(wps->cred.encr_type &
(WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) {
if (wps->cred.encr_type & WPS_ENCR_WEP) {
wpa_printf(MSG_INFO, "WPS: Reject Credential "
"due to WEP configuration");
wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
return -2;
}
wpa_printf(MSG_INFO, "WPS: Reject Credential due to "
"invalid encr_type 0x%x", wps->cred.encr_type);
return -1;
}
#endif /* CONFIG_WPS2 */
if (wps->wps->cred_cb) {
wps->cred.cred_attr = cred - 4;
wps->cred.cred_attr_len = cred_len + 4;
wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred);
wps->cred.cred_attr = NULL;
wps->cred.cred_attr_len = 0;
}
return 0;
}
static int wps_process_creds(struct wps_data *wps, const u8 *cred[],
size_t cred_len[], size_t num_cred, int wps2)
{
size_t i;
int ok = 0;
if (wps->wps->ap)
return 0;
if (num_cred == 0) {
wpa_printf(MSG_DEBUG, "WPS: No Credential attributes "
"received");
return -1;
}
for (i = 0; i < num_cred; i++) {
int res;
res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2);
if (res == 0)
ok++;
else if (res == -2)
wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped");
else
return -1;
}
if (ok == 0) {
wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute "
"received");
return -1;
}
return 0;
}
static int wps_process_ap_settings_e(struct wps_data *wps,
struct wps_parse_attr *attr,
struct wpabuf *attrs, int wps2)
{
struct wps_credential cred;
if (!wps->wps->ap)
return 0;
if (wps_process_ap_settings(attr, &cred) < 0)
return -1;
wpa_printf(MSG_INFO, "WPS: Received new AP configuration from "
"Registrar");
if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) !=
0) {
wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings ("
MACSTR ") does not match with own address (" MACSTR
")", MAC2STR(cred.mac_addr),
MAC2STR(wps->wps->dev.mac_addr));
/*
* In theory, this could be consider fatal error, but there are
* number of deployed implementations using other address here
* due to unclarity in the specification. For interoperability
* reasons, allow this to be processed since we do not really
* use the MAC Address information for anything.
*/
#ifdef CONFIG_WPS_STRICT
if (wps2) {
wpa_printf(MSG_INFO, "WPS: Do not accept incorrect "
"MAC Address in AP Settings");
return -1;
}
#endif /* CONFIG_WPS_STRICT */
}
#ifdef CONFIG_WPS2
if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES)))
{
if (cred.encr_type & WPS_ENCR_WEP) {
wpa_printf(MSG_INFO, "WPS: Reject new AP settings "
"due to WEP configuration");
wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED;
return -1;
}
wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to "
"invalid encr_type 0x%x", cred.encr_type);
return -1;
}
#endif /* CONFIG_WPS2 */
#ifdef CONFIG_WPS_STRICT
if (wps2) {
if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) ==
WPS_ENCR_TKIP ||
(cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
WPS_AUTH_WPAPSK) {
wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 "
"AP Settings: WPA-Personal/TKIP only");
wps->error_indication =
WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED;
return -1;
}
}
#endif /* CONFIG_WPS_STRICT */
#ifdef CONFIG_WPS2
if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP)
{
wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> "
"TKIP+AES");
cred.encr_type |= WPS_ENCR_AES;
}
if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) ==
WPS_AUTH_WPAPSK) {
wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> "
"WPAPSK+WPA2PSK");
cred.auth_type |= WPS_AUTH_WPA2PSK;
}
#endif /* CONFIG_WPS2 */
if (wps->wps->cred_cb) {
cred.cred_attr = wpabuf_head(attrs);
cred.cred_attr_len = wpabuf_len(attrs);
wps->wps->cred_cb(wps->wps->cb_ctx, &cred);
}
return 0;
}
static enum wps_process_res wps_process_m2(struct wps_data *wps,
const struct wpabuf *msg,
struct wps_parse_attr *attr)
{
wpa_printf(MSG_DEBUG, "WPS: Received M2");
if (wps->state != RECV_M2) {
wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
"receiving M2", wps->state);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_process_registrar_nonce(wps, attr->registrar_nonce) ||
wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
wps_process_uuid_r(wps, attr->uuid_r)) {
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
/*
* Stop here on an AP as an Enrollee if AP Setup is locked unless the
* special locked mode is used to allow protocol run up to M7 in order
* to support external Registrars that only learn the current AP
* configuration without changing it.
*/
if (wps->wps->ap &&
((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) ||
wps->dev_password == NULL)) {
wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
"registration of a new Registrar");
wps->config_error = WPS_CFG_SETUP_LOCKED;
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) ||
wps_process_authenticator(wps, attr->authenticator, msg) ||
wps_process_device_attrs(&wps->peer_dev, attr)) {
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wps->state = SEND_M3;
return WPS_CONTINUE;
}
static enum wps_process_res wps_process_m2d(struct wps_data *wps,
struct wps_parse_attr *attr)
{
wpa_printf(MSG_DEBUG, "WPS: Received M2D");
if (wps->state != RECV_M2) {
wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
"receiving M2D", wps->state);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer",
attr->manufacturer, attr->manufacturer_len);
wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name",
attr->model_name, attr->model_name_len);
wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number",
attr->model_number, attr->model_number_len);
wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number",
attr->serial_number, attr->serial_number_len);
wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name",
attr->dev_name, attr->dev_name_len);
if (wps->wps->event_cb) {
union wps_event_data data;
struct wps_event_m2d *m2d = &data.m2d;
os_memset(&data, 0, sizeof(data));
if (attr->config_methods)
m2d->config_methods =
WPA_GET_BE16(attr->config_methods);
m2d->manufacturer = attr->manufacturer;
m2d->manufacturer_len = attr->manufacturer_len;
m2d->model_name = attr->model_name;
m2d->model_name_len = attr->model_name_len;
m2d->model_number = attr->model_number;
m2d->model_number_len = attr->model_number_len;
m2d->serial_number = attr->serial_number;
m2d->serial_number_len = attr->serial_number_len;
m2d->dev_name = attr->dev_name;
m2d->dev_name_len = attr->dev_name_len;
m2d->primary_dev_type = attr->primary_dev_type;
if (attr->config_error)
m2d->config_error =
WPA_GET_BE16(attr->config_error);
if (attr->dev_password_id)
m2d->dev_password_id =
WPA_GET_BE16(attr->dev_password_id);
wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data);
}
wps->state = RECEIVED_M2D;
return WPS_CONTINUE;
}
static enum wps_process_res wps_process_m4(struct wps_data *wps,
const struct wpabuf *msg,
struct wps_parse_attr *attr)
{
struct wpabuf *decrypted;
struct wps_parse_attr eattr;
wpa_printf(MSG_DEBUG, "WPS: Received M4");
if (wps->state != RECV_M4) {
wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
"receiving M4", wps->state);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
wps_process_authenticator(wps, attr->authenticator, msg) ||
wps_process_r_hash1(wps, attr->r_hash1) ||
wps_process_r_hash2(wps, attr->r_hash2)) {
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
attr->encr_settings_len);
if (decrypted == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
"Settings attribute");
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_validate_m4_encr(decrypted, attr->version2 != NULL) < 0) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
"attribute");
if (wps_parse_msg(decrypted, &eattr) < 0 ||
wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
wps_process_r_snonce1(wps, eattr.r_snonce1)) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpabuf_free(decrypted);
wps->state = SEND_M5;
return WPS_CONTINUE;
}
static enum wps_process_res wps_process_m6(struct wps_data *wps,
const struct wpabuf *msg,
struct wps_parse_attr *attr)
{
struct wpabuf *decrypted;
struct wps_parse_attr eattr;
wpa_printf(MSG_DEBUG, "WPS: Received M6");
if (wps->state != RECV_M6) {
wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
"receiving M6", wps->state);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
wps_process_authenticator(wps, attr->authenticator, msg)) {
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
attr->encr_settings_len);
if (decrypted == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
"Settings attribute");
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_validate_m6_encr(decrypted, attr->version2 != NULL) < 0) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
"attribute");
if (wps_parse_msg(decrypted, &eattr) < 0 ||
wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
wps_process_r_snonce2(wps, eattr.r_snonce2)) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpabuf_free(decrypted);
if (wps->wps->ap)
wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_AP_PIN_SUCCESS,
NULL);
wps->state = SEND_M7;
return WPS_CONTINUE;
}
static enum wps_process_res wps_process_m8(struct wps_data *wps,
const struct wpabuf *msg,
struct wps_parse_attr *attr)
{
struct wpabuf *decrypted;
struct wps_parse_attr eattr;
wpa_printf(MSG_DEBUG, "WPS: Received M8");
if (wps->state != RECV_M8) {
wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for "
"receiving M8", wps->state);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) ||
wps_process_authenticator(wps, attr->authenticator, msg)) {
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps->wps->ap && wps->wps->ap_setup_locked) {
/*
* Stop here if special ap_setup_locked == 2 mode allowed the
* protocol to continue beyond M2. This allows ER to learn the
* current AP settings without changing them.
*/
wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse "
"registration of a new Registrar");
wps->config_error = WPS_CFG_SETUP_LOCKED;
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings,
attr->encr_settings_len);
if (decrypted == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted "
"Settings attribute");
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
if (wps_validate_m8_encr(decrypted, wps->wps->ap,
attr->version2 != NULL) < 0) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings "
"attribute");
if (wps_parse_msg(decrypted, &eattr) < 0 ||
wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) ||
wps_process_creds(wps, eattr.cred, eattr.cred_len,
eattr.num_cred, attr->version2 != NULL) ||
wps_process_ap_settings_e(wps, &eattr, decrypted,
attr->version2 != NULL)) {
wpabuf_free(decrypted);
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
wpabuf_free(decrypted);
wps->state = WPS_MSG_DONE;
return WPS_CONTINUE;
}
static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps,
const struct wpabuf *msg)
{
struct wps_parse_attr attr;
enum wps_process_res ret = WPS_CONTINUE;
wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG");
if (wps_parse_msg(msg, &attr) < 0)
return WPS_FAILURE;
if (attr.enrollee_nonce == NULL ||
os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
return WPS_FAILURE;
}
if (attr.msg_type == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
wps->state = SEND_WSC_NACK;
return WPS_CONTINUE;
}
switch (*attr.msg_type) {
case WPS_M2:
if (wps_validate_m2(msg) < 0)
return WPS_FAILURE;
ret = wps_process_m2(wps, msg, &attr);
break;
case WPS_M2D:
if (wps_validate_m2d(msg) < 0)
return WPS_FAILURE;
ret = wps_process_m2d(wps, &attr);
break;
case WPS_M4:
if (wps_validate_m4(msg) < 0)
return WPS_FAILURE;
ret = wps_process_m4(wps, msg, &attr);
if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
wps_fail_event(wps->wps, WPS_M4, wps->config_error,
wps->error_indication);
break;
case WPS_M6:
if (wps_validate_m6(msg) < 0)
return WPS_FAILURE;
ret = wps_process_m6(wps, msg, &attr);
if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
wps_fail_event(wps->wps, WPS_M6, wps->config_error,
wps->error_indication);
break;
case WPS_M8:
if (wps_validate_m8(msg) < 0)
return WPS_FAILURE;
ret = wps_process_m8(wps, msg, &attr);
if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK)
wps_fail_event(wps->wps, WPS_M8, wps->config_error,
wps->error_indication);
break;
default:
wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d",
*attr.msg_type);
return WPS_FAILURE;
}
/*
* Save a copy of the last message for Authenticator derivation if we
* are continuing. However, skip M2D since it is not authenticated and
* neither is the ACK/NACK response frame. This allows the possibly
* following M2 to be processed correctly by using the previously sent
* M1 in Authenticator derivation.
*/
if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) {
/* Save a copy of the last message for Authenticator derivation
*/
wpabuf_free(wps->last_msg);
wps->last_msg = wpabuf_dup(msg);
}
return ret;
}
static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps,
const struct wpabuf *msg)
{
struct wps_parse_attr attr;
wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK");
if (wps_parse_msg(msg, &attr) < 0)
return WPS_FAILURE;
if (attr.msg_type == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
return WPS_FAILURE;
}
if (*attr.msg_type != WPS_WSC_ACK) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
*attr.msg_type);
return WPS_FAILURE;
}
if (attr.registrar_nonce == NULL ||
os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
{
wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
return WPS_FAILURE;
}
if (attr.enrollee_nonce == NULL ||
os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
return WPS_FAILURE;
}
if (wps->state == RECV_ACK && wps->wps->ap) {
wpa_printf(MSG_DEBUG, "WPS: External Registrar registration "
"completed successfully");
wps_success_event(wps->wps);
wps->state = WPS_FINISHED;
return WPS_DONE;
}
return WPS_FAILURE;
}
static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps,
const struct wpabuf *msg)
{
struct wps_parse_attr attr;
u16 config_error;
wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK");
if (wps_parse_msg(msg, &attr) < 0)
return WPS_FAILURE;
if (attr.msg_type == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute");
return WPS_FAILURE;
}
if (*attr.msg_type != WPS_WSC_NACK) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d",
*attr.msg_type);
return WPS_FAILURE;
}
if (attr.registrar_nonce == NULL ||
os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0))
{
wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce");
wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce",
attr.registrar_nonce, WPS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce",
wps->nonce_r, WPS_NONCE_LEN);
return WPS_FAILURE;
}
if (attr.enrollee_nonce == NULL ||
os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) {
wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce");
wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce",
attr.enrollee_nonce, WPS_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce",
wps->nonce_e, WPS_NONCE_LEN);
return WPS_FAILURE;
}
if (attr.config_error == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute "
"in WSC_NACK");
return WPS_FAILURE;
}
config_error = WPA_GET_BE16(attr.config_error);
wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with "
"Configuration Error %d", config_error);
switch (wps->state) {
case RECV_M4:
wps_fail_event(wps->wps, WPS_M3, config_error,
wps->error_indication);
break;
case RECV_M6:
wps_fail_event(wps->wps, WPS_M5, config_error,
wps->error_indication);
break;
case RECV_M8:
wps_fail_event(wps->wps, WPS_M7, config_error,
wps->error_indication);
break;
default:
break;
}
/* Followed by NACK if Enrollee is Supplicant or EAP-Failure if
* Enrollee is Authenticator */
wps->state = SEND_WSC_NACK;
return WPS_FAILURE;
}
enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps,
enum wsc_op_code op_code,
const struct wpabuf *msg)
{
wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu "
"op_code=%d)",
(unsigned long) wpabuf_len(msg), op_code);
if (op_code == WSC_UPnP) {
/* Determine the OpCode based on message type attribute */
struct wps_parse_attr attr;
if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) {
if (*attr.msg_type == WPS_WSC_ACK)
op_code = WSC_ACK;
else if (*attr.msg_type == WPS_WSC_NACK)
op_code = WSC_NACK;
}
}
switch (op_code) {
case WSC_MSG:
case WSC_UPnP:
return wps_process_wsc_msg(wps, msg);
case WSC_ACK:
if (wps_validate_wsc_ack(msg) < 0)
return WPS_FAILURE;
return wps_process_wsc_ack(wps, msg);
case WSC_NACK:
if (wps_validate_wsc_nack(msg) < 0)
return WPS_FAILURE;
return wps_process_wsc_nack(wps, msg);
default:
wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code);
return WPS_FAILURE;
}
}