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/*
* EAP peer method: EAP-TLS (RFC 2716)
* Copyright (c) 2004-2006, 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 "eap_i.h"
#include "eap_tls_common.h"
#include "config_ssid.h"
#include "tls.h"
static void eap_tls_deinit(struct eap_sm *sm, void *priv);
struct eap_tls_data {
struct eap_ssl_data ssl;
u8 *key_data;
};
static void * eap_tls_init(struct eap_sm *sm)
{
struct eap_tls_data *data;
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL ||
((sm->init_phase2 ? config->private_key2 : config->private_key)
== NULL && config->engine == 0)) {
wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
return NULL;
}
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
if (eap_tls_ssl_init(sm, &data->ssl, config)) {
wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
eap_tls_deinit(sm, data);
if (config->engine) {
wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
"PIN");
eap_sm_request_pin(sm);
sm->ignore = TRUE;
} else if (config->private_key && !config->private_key_passwd)
{
wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
"key passphrase");
eap_sm_request_passphrase(sm);
sm->ignore = TRUE;
}
return NULL;
}
return data;
}
static void eap_tls_deinit(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
if (data == NULL)
return;
eap_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
os_free(data);
}
static u8 * eap_tls_failure(struct eap_sm *sm, struct eap_tls_data *data,
struct eap_method_ret *ret, int res, u8 *resp,
u8 id, size_t *respDataLen)
{
wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
if (res == -1) {
struct wpa_ssid *config = eap_get_config(sm);
if (config) {
/*
* The TLS handshake failed. So better forget the old
* PIN. It may be wrong, we cannot be sure but trying
* the wrong one again might block it on the card--so
* better ask the user again.
*/
os_free(config->pin);
config->pin = NULL;
}
}
if (resp) {
/*
* This is likely an alert message, so send it instead of just
* ACKing the error.
*/
return resp;
}
return eap_tls_build_ack(&data->ssl, respDataLen, id, EAP_TYPE_TLS, 0);
}
static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
struct eap_method_ret *ret)
{
wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
os_free(data->key_data);
data->key_data = eap_tls_derive_key(sm, &data->ssl,
"client EAP encryption",
EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
if (data->key_data) {
wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
data->key_data, EAP_TLS_KEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
data->key_data + EAP_TLS_KEY_LEN,
EAP_EMSK_LEN);
} else {
wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
}
}
static u8 * eap_tls_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
const struct eap_hdr *req;
size_t left;
int res;
u8 flags, *resp, id;
const u8 *pos;
struct eap_tls_data *data = priv;
pos = eap_tls_process_init(sm, &data->ssl, EAP_TYPE_TLS, ret,
reqData, reqDataLen, &left, &flags);
if (pos == NULL)
return NULL;
req = (const struct eap_hdr *) reqData;
id = req->identifier;
if (flags & EAP_TLS_FLAGS_START) {
wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
left = 0; /* make sure that this frame is empty, even though it
* should always be, anyway */
}
resp = NULL;
res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id, pos,
left, &resp, respDataLen);
if (res < 0) {
return eap_tls_failure(sm, data, ret, res, resp, id,
respDataLen);
}
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
eap_tls_success(sm, data, ret);
if (res == 1) {
return eap_tls_build_ack(&data->ssl, respDataLen, id,
EAP_TYPE_TLS, 0);
}
return resp;
}
static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
}
static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
}
static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
os_free(data->key_data);
data->key_data = NULL;
if (eap_tls_reauth_init(sm, &data->ssl)) {
os_free(data);
return NULL;
}
return priv;
}
static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose)
{
struct eap_tls_data *data = priv;
return eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
}
static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
return data->key_data != NULL;
}
static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_tls_data *data = priv;
u8 *key;
if (data->key_data == NULL)
return NULL;
key = os_malloc(EAP_TLS_KEY_LEN);
if (key == NULL)
return NULL;
*len = EAP_TLS_KEY_LEN;
os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
return key;
}
static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_tls_data *data = priv;
u8 *key;
if (data->key_data == NULL)
return NULL;
key = os_malloc(EAP_EMSK_LEN);
if (key == NULL)
return NULL;
*len = EAP_EMSK_LEN;
os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
return key;
}
int eap_peer_tls_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
if (eap == NULL)
return -1;
eap->init = eap_tls_init;
eap->deinit = eap_tls_deinit;
eap->process = eap_tls_process;
eap->isKeyAvailable = eap_tls_isKeyAvailable;
eap->getKey = eap_tls_getKey;
eap->get_status = eap_tls_get_status;
eap->has_reauth_data = eap_tls_has_reauth_data;
eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
eap->init_for_reauth = eap_tls_init_for_reauth;
eap->get_emsk = eap_tls_get_emsk;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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