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/*
* EAP peer method: EAP-TLS (RFC 5216, RFC 9190)
* Copyright (c) 2004-2008, 2012-2019, 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 "crypto/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"
static void eap_tls_deinit(struct eap_sm *sm, void *priv);
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;
struct wpabuf *pending_resp;
bool prot_success_received;
};
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 void eap_tls_free_key(struct eap_tls_data *data)
{
if (data->key_data) {
bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
data->key_data = NULL;
}
}
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);
eap_tls_free_key(data);
os_free(data->session_id);
wpabuf_free(data->pending_resp);
os_free(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)
{
const char *label;
const u8 eap_tls13_context[] = { EAP_TYPE_TLS };
const u8 *context = NULL;
size_t context_len = 0;
wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
if (data->ssl.tls_out) {
wpa_printf(MSG_DEBUG, "EAP-TLS: Fragment(s) remaining");
return;
}
if (data->ssl.tls_v13) {
label = "EXPORTER_EAP_TLS_Key_Material";
context = eap_tls13_context;
context_len = 1;
/* A possible NewSessionTicket may be received before
* EAP-Success, so need to allow it to be received. */
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
} else {
label = "client EAP encryption";
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
}
eap_tls_free_key(data);
data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, label,
context, context_len,
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;
if (sm->waiting_ext_cert_check && data->pending_resp) {
struct eap_peer_config *config = eap_get_config(sm);
if (config->pending_ext_cert_check == EXT_CERT_CHECK_GOOD) {
wpa_printf(MSG_DEBUG,
"EAP-TLS: External certificate check succeeded - continue handshake");
resp = data->pending_resp;
data->pending_resp = NULL;
sm->waiting_ext_cert_check = 0;
return resp;
}
if (config->pending_ext_cert_check == EXT_CERT_CHECK_BAD) {
wpa_printf(MSG_DEBUG,
"EAP-TLS: External certificate check failed - force authentication failure");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
sm->waiting_ext_cert_check = 0;
return NULL;
}
wpa_printf(MSG_DEBUG,
"EAP-TLS: Continuing to wait external server certificate validation");
return NULL;
}
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 (sm->waiting_ext_cert_check) {
wpa_printf(MSG_DEBUG,
"EAP-TLS: Waiting external server certificate validation");
wpabuf_free(data->pending_resp);
data->pending_resp = resp;
return NULL;
}
/* RFC 9190 Section 2.5 */
if (res == 2 && data->ssl.tls_v13 && wpabuf_len(resp) == 1 &&
*wpabuf_head_u8(resp) == 0) {
wpa_printf(MSG_DEBUG,
"EAP-TLS: ACKing protected success indication (appl data 0x00)");
eap_peer_tls_reset_output(&data->ssl);
res = 1;
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
data->prot_success_received = true;
}
if (tls_connection_established(data->ssl_ctx, data->ssl.conn) &&
(!data->ssl.tls_v13 || data->prot_success_received))
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 */
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