wps_enrollee.c

最新的Host AP 新添加了许多pcmcia 的驱动

/*
 * Wi-Fi Protected Setup - Enrollee
 * Copyright (c) 2008, Jouni Malinen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "sha256.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 (os_get_random(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 methods;

	if (os_get_random(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;

	methods = WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
	if (wps->pbc)
		methods |= WPS_CONFIG_PUSHBUTTON;

	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, 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)) {
		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_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_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)
{
	wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
	wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
	wpabuf_put_be16(msg, 2);
	wpabuf_put_be16(msg, wps->wps->auth_types);
	return 0;
}


static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
{
	wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
	wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
	wpabuf_put_be16(msg, 2);
	wpabuf_put_be16(msg, wps->wps->encr_types);
	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_authenticator(wps, msg)) {
		wpabuf_free(plain);
		wpabuf_free(msg);
		return NULL;
	}
	wpabuf_free(plain);

	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)) {
		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;
}


static struct wpabuf * wps_build_wsc_ack(struct wps_data *wps)
{
	struct wpabuf *msg;

	wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_ACK");

	msg = wpabuf_alloc(1000);
	if (msg == NULL)
		return NULL;

	if (wps_build_version(msg) ||
	    wps_build_msg_type(msg, WPS_WSC_ACK) ||
	    wps_build_enrollee_nonce(wps, msg) ||
	    wps_build_registrar_nonce(wps, msg)) {
		wpabuf_free(msg);
		return NULL;
	}

	return msg;
}


static struct wpabuf * wps_build_wsc_nack(struct wps_data *wps)
{
	struct wpabuf *msg;

	wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_NACK");

	msg = wpabuf_alloc(1000);
	if (msg == NULL)
		return NULL;

	if (wps_build_version(msg) ||
	    wps_build_msg_type(msg, WPS_WSC_NACK) ||
	    wps_build_enrollee_nonce(wps, msg) ||
	    wps_build_registrar_nonce(wps, msg) ||
	    wps_build_config_error(msg, wps->config_error)) {
		wpabuf_free(msg);
		return NULL;
	}

	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;
	}

	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;

	if (wps->request_type == WPS_REQ_WLAN_MANAGER_REGISTRAR &&
	    wps_derive_mgmt_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;