2 * hostapd / EAP-TLS (RFC 2716)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
13 #include "eap_tls_common.h"
14 #include "crypto/tls.h"
17 static void eap_tls_reset(struct eap_sm *sm, void *priv);
21 struct eap_ssl_data ssl;
22 enum { START, CONTINUE, SUCCESS, FAILURE } state;
28 static const char * eap_tls_state_txt(int state)
45 static void eap_tls_state(struct eap_tls_data *data, int state)
47 wpa_printf(MSG_DEBUG, "EAP-TLS: %s -> %s",
48 eap_tls_state_txt(data->state),
49 eap_tls_state_txt(state));
54 static void * eap_tls_init(struct eap_sm *sm)
56 struct eap_tls_data *data;
58 data = os_zalloc(sizeof(*data));
63 if (eap_server_tls_ssl_init(sm, &data->ssl, 1)) {
64 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
65 eap_tls_reset(sm, data);
69 data->eap_type = EAP_TYPE_TLS;
75 #ifdef EAP_SERVER_UNAUTH_TLS
76 static void * eap_unauth_tls_init(struct eap_sm *sm)
78 struct eap_tls_data *data;
80 data = os_zalloc(sizeof(*data));
85 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
86 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
87 eap_tls_reset(sm, data);
91 data->eap_type = EAP_UNAUTH_TLS_TYPE;
94 #endif /* EAP_SERVER_UNAUTH_TLS */
97 static void eap_tls_reset(struct eap_sm *sm, void *priv)
99 struct eap_tls_data *data = priv;
102 eap_server_tls_ssl_deinit(sm, &data->ssl);
107 static struct wpabuf * eap_tls_build_start(struct eap_sm *sm,
108 struct eap_tls_data *data, u8 id)
112 req = eap_tls_msg_alloc(data->eap_type, 1, EAP_CODE_REQUEST, id);
114 wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
116 eap_tls_state(data, FAILURE);
120 wpabuf_put_u8(req, EAP_TLS_FLAGS_START);
122 eap_tls_state(data, CONTINUE);
128 static struct wpabuf * eap_tls_buildReq(struct eap_sm *sm, void *priv, u8 id)
130 struct eap_tls_data *data = priv;
133 if (data->ssl.state == FRAG_ACK) {
134 return eap_server_tls_build_ack(id, data->eap_type, 0);
137 if (data->ssl.state == WAIT_FRAG_ACK) {
138 res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0,
140 goto check_established;
143 switch (data->state) {
145 return eap_tls_build_start(sm, data, id);
147 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
148 data->established = 1;
151 wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
152 __func__, data->state);
156 res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0, id);
159 if (data->established && data->ssl.state != WAIT_FRAG_ACK) {
160 /* TLS handshake has been completed and there are no more
161 * fragments waiting to be sent out. */
162 wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
163 eap_tls_state(data, SUCCESS);
170 static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
171 struct wpabuf *respData)
173 struct eap_tls_data *data = priv;
177 if (data->eap_type == EAP_UNAUTH_TLS_TYPE)
178 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
179 EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
182 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_type,
184 if (pos == NULL || len < 1) {
185 wpa_printf(MSG_INFO, "EAP-TLS: Invalid frame");
193 static void eap_tls_process_msg(struct eap_sm *sm, void *priv,
194 const struct wpabuf *respData)
196 struct eap_tls_data *data = priv;
197 if (data->state == SUCCESS && wpabuf_len(data->ssl.tls_in) == 0) {
198 wpa_printf(MSG_DEBUG, "EAP-TLS: Client acknowledged final TLS "
199 "handshake message");
202 if (eap_server_tls_phase1(sm, &data->ssl) < 0)
203 eap_tls_state(data, FAILURE);
207 static void eap_tls_process(struct eap_sm *sm, void *priv,
208 struct wpabuf *respData)
210 struct eap_tls_data *data = priv;
211 if (eap_server_tls_process(sm, &data->ssl, respData, data,
212 data->eap_type, NULL, eap_tls_process_msg) <
214 eap_tls_state(data, FAILURE);
218 static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
220 struct eap_tls_data *data = priv;
221 return data->state == SUCCESS || data->state == FAILURE;
225 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
227 struct eap_tls_data *data = priv;
230 if (data->state != SUCCESS)
233 eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
234 "client EAP encryption",
237 *len = EAP_TLS_KEY_LEN;
238 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
239 eapKeyData, EAP_TLS_KEY_LEN);
241 wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
248 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
250 struct eap_tls_data *data = priv;
251 u8 *eapKeyData, *emsk;
253 if (data->state != SUCCESS)
256 eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
257 "client EAP encryption",
258 EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
260 emsk = os_malloc(EAP_EMSK_LEN);
262 os_memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
270 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
273 wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
280 static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
282 struct eap_tls_data *data = priv;
283 return data->state == SUCCESS;
287 int eap_server_tls_register(void)
289 struct eap_method *eap;
292 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
293 EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
297 eap->init = eap_tls_init;
298 eap->reset = eap_tls_reset;
299 eap->buildReq = eap_tls_buildReq;
300 eap->check = eap_tls_check;
301 eap->process = eap_tls_process;
302 eap->isDone = eap_tls_isDone;
303 eap->getKey = eap_tls_getKey;
304 eap->isSuccess = eap_tls_isSuccess;
305 eap->get_emsk = eap_tls_get_emsk;
307 ret = eap_server_method_register(eap);
309 eap_server_method_free(eap);
314 #ifdef EAP_SERVER_UNAUTH_TLS
315 int eap_server_unauth_tls_register(void)
317 struct eap_method *eap;
320 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
321 EAP_VENDOR_UNAUTH_TLS,
322 EAP_VENDOR_TYPE_UNAUTH_TLS,
327 eap->init = eap_unauth_tls_init;
328 eap->reset = eap_tls_reset;
329 eap->buildReq = eap_tls_buildReq;
330 eap->check = eap_tls_check;
331 eap->process = eap_tls_process;
332 eap->isDone = eap_tls_isDone;
333 eap->getKey = eap_tls_getKey;
334 eap->isSuccess = eap_tls_isSuccess;
335 eap->get_emsk = eap_tls_get_emsk;
337 ret = eap_server_method_register(eap);
339 eap_server_method_free(eap);
342 #endif /* EAP_SERVER_UNAUTH_TLS */