2
* hostapd / EAP-TLS (RFC 2716)
3
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
5
* This program is free software; you can redistribute it and/or modify
6
* it under the terms of the GNU General Public License version 2 as
7
* published by the Free Software Foundation.
9
* Alternatively, this software may be distributed under the terms of BSD
12
* See README and COPYING for more details.
19
#include "eap_tls_common.h"
23
static void eap_tls_reset(struct eap_sm *sm, void *priv);
27
struct eap_ssl_data ssl;
28
enum { START, CONTINUE, SUCCESS, FAILURE } state;
32
static void * eap_tls_init(struct eap_sm *sm)
34
struct eap_tls_data *data;
36
data = os_zalloc(sizeof(*data));
41
if (eap_server_tls_ssl_init(sm, &data->ssl, 1)) {
42
wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
43
eap_tls_reset(sm, data);
51
static void eap_tls_reset(struct eap_sm *sm, void *priv)
53
struct eap_tls_data *data = priv;
56
eap_server_tls_ssl_deinit(sm, &data->ssl);
61
static u8 * eap_tls_build_start(struct eap_sm *sm, struct eap_tls_data *data,
62
int id, size_t *reqDataLen)
67
*reqDataLen = sizeof(*req) + 2;
68
req = malloc(*reqDataLen);
70
wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
72
data->state = FAILURE;
76
req->code = EAP_CODE_REQUEST;
78
req->length = host_to_be16(*reqDataLen);
79
pos = (u8 *) (req + 1);
80
*pos++ = EAP_TYPE_TLS;
81
*pos = EAP_TLS_FLAGS_START;
83
data->state = CONTINUE;
89
static u8 * eap_tls_build_req(struct eap_sm *sm, struct eap_tls_data *data,
90
int id, size_t *reqDataLen)
95
res = eap_server_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TLS, 0,
96
id, &req, reqDataLen);
98
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
99
wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
100
data->state = SUCCESS;
104
return eap_server_tls_build_ack(reqDataLen, id, EAP_TYPE_TLS,
110
static u8 * eap_tls_buildReq(struct eap_sm *sm, void *priv, int id,
113
struct eap_tls_data *data = priv;
115
switch (data->state) {
117
return eap_tls_build_start(sm, data, id, reqDataLen);
119
return eap_tls_build_req(sm, data, id, reqDataLen);
121
wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
122
__func__, data->state);
128
static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
129
u8 *respData, size_t respDataLen)
131
struct eap_hdr *resp;
134
resp = (struct eap_hdr *) respData;
135
pos = (u8 *) (resp + 1);
136
if (respDataLen < sizeof(*resp) + 2 || *pos != EAP_TYPE_TLS ||
137
(be_to_host16(resp->length)) > respDataLen) {
138
wpa_printf(MSG_INFO, "EAP-TLS: Invalid frame");
146
static void eap_tls_process(struct eap_sm *sm, void *priv,
147
u8 *respData, size_t respDataLen)
149
struct eap_tls_data *data = priv;
150
struct eap_hdr *resp;
153
unsigned int tls_msg_len;
155
resp = (struct eap_hdr *) respData;
156
pos = (u8 *) (resp + 1);
159
left = be_to_host16(resp->length) - sizeof(struct eap_hdr) - 2;
160
wpa_printf(MSG_DEBUG, "EAP-TLS: Received packet(len=%lu) - "
161
"Flags 0x%02x", (unsigned long) respDataLen, flags);
162
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
164
wpa_printf(MSG_INFO, "EAP-TLS: Short frame with TLS "
166
data->state = FAILURE;
169
tls_msg_len = WPA_GET_BE32(pos);
170
wpa_printf(MSG_DEBUG, "EAP-TLS: TLS Message Length: %d",
172
if (data->ssl.tls_in_left == 0) {
173
data->ssl.tls_in_total = tls_msg_len;
174
data->ssl.tls_in_left = tls_msg_len;
175
free(data->ssl.tls_in);
176
data->ssl.tls_in = NULL;
177
data->ssl.tls_in_len = 0;
183
if (eap_server_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
184
wpa_printf(MSG_INFO, "EAP-TLS: TLS processing failed");
185
data->state = FAILURE;
189
if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
190
wpa_printf(MSG_INFO, "EAP-TLS: Locally detected fatal error "
191
"in TLS processing");
192
data->state = FAILURE;
198
static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
200
struct eap_tls_data *data = priv;
201
return data->state == SUCCESS || data->state == FAILURE;
205
static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
207
struct eap_tls_data *data = priv;
210
if (data->state != SUCCESS)
213
eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
214
"client EAP encryption",
217
*len = EAP_TLS_KEY_LEN;
218
wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
219
eapKeyData, EAP_TLS_KEY_LEN);
221
wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
228
static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
230
struct eap_tls_data *data = priv;
231
u8 *eapKeyData, *emsk;
233
if (data->state != SUCCESS)
236
eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
237
"client EAP encryption",
238
EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
240
emsk = malloc(EAP_EMSK_LEN);
242
memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
250
wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
253
wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
260
static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
262
struct eap_tls_data *data = priv;
263
return data->state == SUCCESS;
267
int eap_server_tls_register(void)
269
struct eap_method *eap;
272
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
273
EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
277
eap->init = eap_tls_init;
278
eap->reset = eap_tls_reset;
279
eap->buildReq = eap_tls_buildReq;
280
eap->check = eap_tls_check;
281
eap->process = eap_tls_process;
282
eap->isDone = eap_tls_isDone;
283
eap->getKey = eap_tls_getKey;
284
eap->isSuccess = eap_tls_isSuccess;
285
eap->get_emsk = eap_tls_get_emsk;
287
ret = eap_server_method_register(eap);
289
eap_server_method_free(eap);