| Current Path : /usr/src/contrib/wpa/src/wps/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/wpa/src/wps/wps_common.c |
/*
* Wi-Fi Protected Setup - common functionality
* Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
*
* 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 "crypto/aes_wrap.h"
#include "crypto/crypto.h"
#include "crypto/dh_group5.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "wps_i.h"
#include "wps_dev_attr.h"
void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
const char *label, u8 *res, size_t res_len)
{
u8 i_buf[4], key_bits[4];
const u8 *addr[4];
size_t len[4];
int i, iter;
u8 hash[SHA256_MAC_LEN], *opos;
size_t left;
WPA_PUT_BE32(key_bits, res_len * 8);
addr[0] = i_buf;
len[0] = sizeof(i_buf);
addr[1] = label_prefix;
len[1] = label_prefix_len;
addr[2] = (const u8 *) label;
len[2] = os_strlen(label);
addr[3] = key_bits;
len[3] = sizeof(key_bits);
iter = (res_len + SHA256_MAC_LEN - 1) / SHA256_MAC_LEN;
opos = res;
left = res_len;
for (i = 1; i <= iter; i++) {
WPA_PUT_BE32(i_buf, i);
hmac_sha256_vector(key, SHA256_MAC_LEN, 4, addr, len, hash);
if (i < iter) {
os_memcpy(opos, hash, SHA256_MAC_LEN);
opos += SHA256_MAC_LEN;
left -= SHA256_MAC_LEN;
} else
os_memcpy(opos, hash, left);
}
}
int wps_derive_keys(struct wps_data *wps)
{
struct wpabuf *pubkey, *dh_shared;
u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
const u8 *addr[3];
size_t len[3];
u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
if (wps->dh_privkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
return -1;
}
pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
if (pubkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
return -1;
}
dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
dh5_free(wps->dh_ctx);
wps->dh_ctx = NULL;
dh_shared = wpabuf_zeropad(dh_shared, 192);
if (dh_shared == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
return -1;
}
/* Own DH private key is not needed anymore */
wpabuf_free(wps->dh_privkey);
wps->dh_privkey = NULL;
wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
/* DHKey = SHA-256(g^AB mod p) */
addr[0] = wpabuf_head(dh_shared);
len[0] = wpabuf_len(dh_shared);
sha256_vector(1, addr, len, dhkey);
wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
wpabuf_free(dh_shared);
/* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
addr[0] = wps->nonce_e;
len[0] = WPS_NONCE_LEN;
addr[1] = wps->mac_addr_e;
len[1] = ETH_ALEN;
addr[2] = wps->nonce_r;
len[2] = WPS_NONCE_LEN;
hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
keys, sizeof(keys));
os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
WPS_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
wps->authkey, WPS_AUTHKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
return 0;
}
void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
size_t dev_passwd_len)
{
u8 hash[SHA256_MAC_LEN];
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, dev_passwd,
(dev_passwd_len + 1) / 2, hash);
os_memcpy(wps->psk1, hash, WPS_PSK_LEN);
hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN,
dev_passwd + (dev_passwd_len + 1) / 2,
dev_passwd_len / 2, hash);
os_memcpy(wps->psk2, hash, WPS_PSK_LEN);
wpa_hexdump_ascii_key(MSG_DEBUG, "WPS: Device Password",
dev_passwd, dev_passwd_len);
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK1", wps->psk1, WPS_PSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: PSK2", wps->psk2, WPS_PSK_LEN);
}
struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
size_t encr_len)
{
struct wpabuf *decrypted;
const size_t block_size = 16;
size_t i;
u8 pad;
const u8 *pos;
/* AES-128-CBC */
if (encr == NULL || encr_len < 2 * block_size || encr_len % block_size)
{
wpa_printf(MSG_DEBUG, "WPS: No Encrypted Settings received");
return NULL;
}
decrypted = wpabuf_alloc(encr_len - block_size);
if (decrypted == NULL)
return NULL;
wpa_hexdump(MSG_MSGDUMP, "WPS: Encrypted Settings", encr, encr_len);
wpabuf_put_data(decrypted, encr + block_size, encr_len - block_size);
if (aes_128_cbc_decrypt(wps->keywrapkey, encr, wpabuf_mhead(decrypted),
wpabuf_len(decrypted))) {
wpabuf_free(decrypted);
return NULL;
}
wpa_hexdump_buf_key(MSG_MSGDUMP, "WPS: Decrypted Encrypted Settings",
decrypted);
pos = wpabuf_head_u8(decrypted) + wpabuf_len(decrypted) - 1;
pad = *pos;
if (pad > wpabuf_len(decrypted)) {
wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad value");
wpabuf_free(decrypted);
return NULL;
}
for (i = 0; i < pad; i++) {
if (*pos-- != pad) {
wpa_printf(MSG_DEBUG, "WPS: Invalid PKCS#5 v2.0 pad "
"string");
wpabuf_free(decrypted);
return NULL;
}
}
decrypted->used -= pad;
return decrypted;
}
/**
* wps_pin_checksum - Compute PIN checksum
* @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
* Returns: Checksum digit
*/
unsigned int wps_pin_checksum(unsigned int pin)
{
unsigned int accum = 0;
while (pin) {
accum += 3 * (pin % 10);
pin /= 10;
accum += pin % 10;
pin /= 10;
}
return (10 - accum % 10) % 10;
}
/**
* wps_pin_valid - Check whether a PIN has a valid checksum
* @pin: Eight digit PIN (i.e., including the checksum digit)
* Returns: 1 if checksum digit is valid, or 0 if not
*/
unsigned int wps_pin_valid(unsigned int pin)
{
return wps_pin_checksum(pin / 10) == (pin % 10);
}
/**
* wps_generate_pin - Generate a random PIN
* Returns: Eight digit PIN (i.e., including the checksum digit)
*/
unsigned int wps_generate_pin(void)
{
unsigned int val;
/* Generate seven random digits for the PIN */
if (os_get_random((unsigned char *) &val, sizeof(val)) < 0) {
struct os_time now;
os_get_time(&now);
val = os_random() ^ now.sec ^ now.usec;
}
val %= 10000000;
/* Append checksum digit */
return val * 10 + wps_pin_checksum(val);
}
void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg)
{
union wps_event_data data;
if (wps->event_cb == NULL)
return;
os_memset(&data, 0, sizeof(data));
data.fail.msg = msg;
wps->event_cb(wps->cb_ctx, WPS_EV_FAIL, &data);
}
void wps_success_event(struct wps_context *wps)
{
if (wps->event_cb == NULL)
return;
wps->event_cb(wps->cb_ctx, WPS_EV_SUCCESS, NULL);
}
void wps_pwd_auth_fail_event(struct wps_context *wps, int enrollee, int part)
{
union wps_event_data data;
if (wps->event_cb == NULL)
return;
os_memset(&data, 0, sizeof(data));
data.pwd_auth_fail.enrollee = enrollee;
data.pwd_auth_fail.part = part;
wps->event_cb(wps->cb_ctx, WPS_EV_PWD_AUTH_FAIL, &data);
}
void wps_pbc_overlap_event(struct wps_context *wps)
{
if (wps->event_cb == NULL)
return;
wps->event_cb(wps->cb_ctx, WPS_EV_PBC_OVERLAP, NULL);
}
void wps_pbc_timeout_event(struct wps_context *wps)
{
if (wps->event_cb == NULL)
return;
wps->event_cb(wps->cb_ctx, WPS_EV_PBC_TIMEOUT, NULL);
}
#ifdef CONFIG_WPS_OOB
static struct wpabuf * wps_get_oob_cred(struct wps_context *wps)
{
struct wps_data data;
struct wpabuf *plain;
plain = wpabuf_alloc(500);
if (plain == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
"credential");
return NULL;
}
os_memset(&data, 0, sizeof(data));
data.wps = wps;
data.auth_type = wps->auth_types;
data.encr_type = wps->encr_types;
if (wps_build_version(plain) || wps_build_cred(&data, plain)) {
wpabuf_free(plain);
return NULL;
}
return plain;
}
static struct wpabuf * wps_get_oob_dev_pwd(struct wps_context *wps)
{
struct wpabuf *data;
data = wpabuf_alloc(9 + WPS_OOB_DEVICE_PASSWORD_ATTR_LEN);
if (data == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
"device password attribute");
return NULL;
}
wpabuf_free(wps->oob_conf.dev_password);
wps->oob_conf.dev_password =
wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
if (wps->oob_conf.dev_password == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
"device password");
wpabuf_free(data);
return NULL;
}
if (wps_build_version(data) ||
wps_build_oob_dev_password(data, wps)) {
wpa_printf(MSG_ERROR, "WPS: Build OOB device password "
"attribute error");
wpabuf_free(data);
return NULL;
}
return data;
}
static int wps_parse_oob_dev_pwd(struct wps_context *wps,
struct wpabuf *data)
{
struct oob_conf_data *oob_conf = &wps->oob_conf;
struct wps_parse_attr attr;
const u8 *pos;
if (wps_parse_msg(data, &attr) < 0 ||
attr.oob_dev_password == NULL) {
wpa_printf(MSG_ERROR, "WPS: OOB device password not found");
return -1;
}
pos = attr.oob_dev_password;
oob_conf->pubkey_hash =
wpabuf_alloc_copy(pos, WPS_OOB_PUBKEY_HASH_LEN);
if (oob_conf->pubkey_hash == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
"public key hash");
return -1;
}
pos += WPS_OOB_PUBKEY_HASH_LEN;
wps->oob_dev_pw_id = WPA_GET_BE16(pos);
pos += sizeof(wps->oob_dev_pw_id);
oob_conf->dev_password =
wpabuf_alloc(WPS_OOB_DEVICE_PASSWORD_LEN * 2 + 1);
if (oob_conf->dev_password == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to allocate memory for OOB "
"device password");
return -1;
}
wpa_snprintf_hex_uppercase(wpabuf_put(oob_conf->dev_password,
wpabuf_size(oob_conf->dev_password)),
wpabuf_size(oob_conf->dev_password), pos,
WPS_OOB_DEVICE_PASSWORD_LEN);
return 0;
}
static int wps_parse_oob_cred(struct wps_context *wps, struct wpabuf *data)
{
struct wpabuf msg;
struct wps_parse_attr attr;
size_t i;
if (wps_parse_msg(data, &attr) < 0 || attr.num_cred <= 0) {
wpa_printf(MSG_ERROR, "WPS: OOB credential not found");
return -1;
}
for (i = 0; i < attr.num_cred; i++) {
struct wps_credential local_cred;
struct wps_parse_attr cattr;
os_memset(&local_cred, 0, sizeof(local_cred));
wpabuf_set(&msg, attr.cred[i], attr.cred_len[i]);
if (wps_parse_msg(&msg, &cattr) < 0 ||
wps_process_cred(&cattr, &local_cred)) {
wpa_printf(MSG_ERROR, "WPS: Failed to parse OOB "
"credential");
return -1;
}
wps->cred_cb(wps->cb_ctx, &local_cred);
}
return 0;
}
int wps_process_oob(struct wps_context *wps, struct oob_device_data *oob_dev,
int registrar)
{
struct wpabuf *data;
int ret, write_f, oob_method = wps->oob_conf.oob_method;
void *oob_priv;
write_f = oob_method == OOB_METHOD_DEV_PWD_E ? !registrar : registrar;
oob_priv = oob_dev->init_func(wps, oob_dev, registrar);
if (oob_priv == NULL) {
wpa_printf(MSG_ERROR, "WPS: Failed to initialize OOB device");
return -1;
}
if (write_f) {
if (oob_method == OOB_METHOD_CRED)
data = wps_get_oob_cred(wps);
else
data = wps_get_oob_dev_pwd(wps);
ret = 0;
if (data == NULL || oob_dev->write_func(oob_priv, data) < 0)
ret = -1;
} else {
data = oob_dev->read_func(oob_priv);
if (data == NULL)
ret = -1;
else {
if (oob_method == OOB_METHOD_CRED)
ret = wps_parse_oob_cred(wps, data);
else
ret = wps_parse_oob_dev_pwd(wps, data);
}
}
wpabuf_free(data);
oob_dev->deinit_func(oob_priv);
if (ret < 0) {
wpa_printf(MSG_ERROR, "WPS: Failed to process OOB data");
return -1;
}
return 0;
}
struct oob_device_data * wps_get_oob_device(char *device_type)
{
#ifdef CONFIG_WPS_UFD
if (os_strstr(device_type, "ufd") != NULL)
return &oob_ufd_device_data;
#endif /* CONFIG_WPS_UFD */
#ifdef CONFIG_WPS_NFC
if (os_strstr(device_type, "nfc") != NULL)
return &oob_nfc_device_data;
#endif /* CONFIG_WPS_NFC */
return NULL;
}
#ifdef CONFIG_WPS_NFC
struct oob_nfc_device_data * wps_get_oob_nfc_device(char *device_name)
{
if (device_name == NULL)
return NULL;
#ifdef CONFIG_WPS_NFC_PN531
if (os_strstr(device_name, "pn531") != NULL)
return &oob_nfc_pn531_device_data;
#endif /* CONFIG_WPS_NFC_PN531 */
return NULL;
}
#endif /* CONFIG_WPS_NFC */
int wps_get_oob_method(char *method)
{
if (os_strstr(method, "pin-e") != NULL)
return OOB_METHOD_DEV_PWD_E;
if (os_strstr(method, "pin-r") != NULL)
return OOB_METHOD_DEV_PWD_R;
if (os_strstr(method, "cred") != NULL)
return OOB_METHOD_CRED;
return OOB_METHOD_UNKNOWN;
}
#endif /* CONFIG_WPS_OOB */
int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN])
{
const char *pos;
/* <categ>-<OUI>-<subcateg> */
WPA_PUT_BE16(dev_type, atoi(str));
pos = os_strchr(str, '-');
if (pos == NULL)
return -1;
pos++;
if (hexstr2bin(pos, &dev_type[2], 4))
return -1;
pos = os_strchr(pos, '-');
if (pos == NULL)
return -1;
pos++;
WPA_PUT_BE16(&dev_type[6], atoi(pos));
return 0;
}
char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,
size_t buf_len)
{
int ret;
ret = os_snprintf(buf, buf_len, "%u-%08X-%u",
WPA_GET_BE16(dev_type), WPA_GET_BE32(&dev_type[2]),
WPA_GET_BE16(&dev_type[6]));
if (ret < 0 || (unsigned int) ret >= buf_len)
return NULL;
return buf;
}
void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
{
const u8 *addr[2];
size_t len[2];
u8 hash[SHA1_MAC_LEN];
u8 nsid[16] = {
0x52, 0x64, 0x80, 0xf8,
0xc9, 0x9b,
0x4b, 0xe5,
0xa6, 0x55,
0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
};
addr[0] = nsid;
len[0] = sizeof(nsid);
addr[1] = mac_addr;
len[1] = 6;
sha1_vector(2, addr, len, hash);
os_memcpy(uuid, hash, 16);
/* Version: 5 = named-based version using SHA-1 */
uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
/* Variant specified in RFC 4122 */
uuid[8] = 0x80 | (uuid[8] & 0x3f);
}
u16 wps_config_methods_str2bin(const char *str)
{
u16 methods = 0;
if (str == NULL) {
/* Default to enabling methods based on build configuration */
methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
#ifdef CONFIG_WPS_UFD
methods |= WPS_CONFIG_USBA;
#endif /* CONFIG_WPS_UFD */
#ifdef CONFIG_WPS_NFC
methods |= WPS_CONFIG_NFC_INTERFACE;
#endif /* CONFIG_WPS_NFC */
} else {
if (os_strstr(str, "usba"))
methods |= WPS_CONFIG_USBA;
if (os_strstr(str, "ethernet"))
methods |= WPS_CONFIG_ETHERNET;
if (os_strstr(str, "label"))
methods |= WPS_CONFIG_LABEL;
if (os_strstr(str, "display"))
methods |= WPS_CONFIG_DISPLAY;
if (os_strstr(str, "ext_nfc_token"))
methods |= WPS_CONFIG_EXT_NFC_TOKEN;
if (os_strstr(str, "int_nfc_token"))
methods |= WPS_CONFIG_INT_NFC_TOKEN;
if (os_strstr(str, "nfc_interface"))
methods |= WPS_CONFIG_NFC_INTERFACE;
if (os_strstr(str, "push_button"))
methods |= WPS_CONFIG_PUSHBUTTON;
if (os_strstr(str, "keypad"))
methods |= WPS_CONFIG_KEYPAD;
}
return methods;
}