OVMS3-idf/components/wpa_supplicant/src/eap_peer/eap_tls.c

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/*
* EAP peer method: EAP-TLS (RFC 2716)
* Copyright (c) 2004-2008, 2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#ifdef EAP_TLS
#include "utils/common.h"
#include "tls/tls.h"
#include "eap_peer/eap_i.h"
#include "eap_peer/eap_defs.h"
#include "eap_peer/eap_tls_common.h"
#include "eap_peer/eap_config.h"
#include "eap_peer/eap_methods.h"
struct eap_tls_data {
struct eap_ssl_data ssl;
u8 *key_data;
u8 *session_id;
size_t id_len;
void *ssl_ctx;
u8 eap_type;
};
static void eap_tls_deinit(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
if (data == NULL)
return;
eap_peer_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
os_free(data->session_id);
os_free(data);
}
static void * eap_tls_init(struct eap_sm *sm)
{
struct eap_tls_data *data;
struct eap_peer_config *config = eap_get_config(sm);
if (config == NULL ||
config->private_key == 0) {
wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
return NULL;
}
data = (struct eap_tls_data *)os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->ssl_ctx = sm->ssl_ctx;
if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TLS)) {
wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
eap_tls_deinit(sm, data);
return NULL;
}
data->eap_type = EAP_TYPE_TLS;
return data;
}
static struct wpabuf * eap_tls_failure(struct eap_sm *sm,
struct eap_tls_data *data,
struct eap_method_ret *ret, int res,
struct wpabuf *resp, u8 id)
{
wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
if (res == -1) {
struct eap_peer_config *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_peer_tls_build_ack(id, data->eap_type, 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_peer_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");
}
os_free(data->session_id);
data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
EAP_TYPE_TLS,
&data->id_len);
if (data->session_id) {
wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived Session-Id",
data->session_id, data->id_len);
} else {
wpa_printf(MSG_ERROR, "EAP-TLS: Failed to derive Session-Id");
}
}
static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
size_t left;
int res;
struct wpabuf *resp;
u8 flags, id;
const u8 *pos;
struct eap_tls_data *data = priv;
pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
reqData, &left, &flags);
if (pos == NULL)
return NULL;
id = eap_get_id(reqData);
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_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
id, pos, left, &resp);
if (res < 0) {
return eap_tls_failure(sm, data, ret, res, resp, id);
}
if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
eap_tls_success(sm, data, ret);
if (res == 1) {
wpabuf_free(resp);
return eap_peer_tls_build_ack(id, data->eap_type, 0);
}
return resp;
}
static bool 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;
}
int eap_peer_tls_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(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;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
#endif /* EAP_TLS */