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.
20 #include "eap_tls_common.h"
24 static void eap_tls_reset(struct eap_sm *sm, void *priv);
28 struct eap_ssl_data ssl;
29 enum { START, CONTINUE, SUCCESS, FAILURE } state;
33 static void * eap_tls_init(struct eap_sm *sm)
35 struct eap_tls_data *data;
37 data = wpa_zalloc(sizeof(*data));
42 if (eap_tls_ssl_init(sm, &data->ssl, 1)) {
43 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
44 eap_tls_reset(sm, data);
52 static void eap_tls_reset(struct eap_sm *sm, void *priv)
54 struct eap_tls_data *data = priv;
57 eap_tls_ssl_deinit(sm, &data->ssl);
62 static u8 * eap_tls_build_start(struct eap_sm *sm, struct eap_tls_data *data,
63 int id, size_t *reqDataLen)
68 *reqDataLen = sizeof(*req) + 2;
69 req = malloc(*reqDataLen);
71 wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
73 data->state = FAILURE;
77 req->code = EAP_CODE_REQUEST;
79 req->length = htons(*reqDataLen);
80 pos = (u8 *) (req + 1);
81 *pos++ = EAP_TYPE_TLS;
82 *pos = EAP_TLS_FLAGS_START;
84 data->state = CONTINUE;
90 static u8 * eap_tls_build_req(struct eap_sm *sm, struct eap_tls_data *data,
91 int id, size_t *reqDataLen)
96 res = eap_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id,
99 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
100 wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
101 data->state = SUCCESS;
105 return eap_tls_build_ack(reqDataLen, id, EAP_TYPE_TLS, 0);
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 (ntohs(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 = htons(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 = (pos[0] << 24) | (pos[1] << 16) | (pos[2] << 8) |
171 wpa_printf(MSG_DEBUG, "EAP-TLS: TLS Message Length: %d",
173 if (data->ssl.tls_in_left == 0) {
174 data->ssl.tls_in_total = tls_msg_len;
175 data->ssl.tls_in_left = tls_msg_len;
176 free(data->ssl.tls_in);
177 data->ssl.tls_in = NULL;
178 data->ssl.tls_in_len = 0;
184 if (eap_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
185 wpa_printf(MSG_INFO, "EAP-TLS: TLS processing failed");
186 data->state = FAILURE;
190 if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
191 wpa_printf(MSG_INFO, "EAP-TLS: Locally detected fatal error "
192 "in TLS processing");
193 data->state = FAILURE;
199 static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
201 struct eap_tls_data *data = priv;
202 return data->state == SUCCESS || data->state == FAILURE;
206 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
208 struct eap_tls_data *data = priv;
211 if (data->state != SUCCESS)
214 eapKeyData = eap_tls_derive_key(sm, &data->ssl,
215 "client EAP encryption",
218 *len = EAP_TLS_KEY_LEN;
219 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
220 eapKeyData, EAP_TLS_KEY_LEN);
222 wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
229 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
231 struct eap_tls_data *data = priv;
232 u8 *eapKeyData, *emsk;
234 if (data->state != SUCCESS)
237 eapKeyData = eap_tls_derive_key(sm, &data->ssl,
238 "client EAP encryption",
239 EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
241 emsk = malloc(EAP_EMSK_LEN);
243 memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
251 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
254 wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
261 static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
263 struct eap_tls_data *data = priv;
264 return data->state == SUCCESS;
268 int eap_server_tls_register(void)
270 struct eap_method *eap;
273 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
274 EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
278 eap->init = eap_tls_init;
279 eap->reset = eap_tls_reset;
280 eap->buildReq = eap_tls_buildReq;
281 eap->check = eap_tls_check;
282 eap->process = eap_tls_process;
283 eap->isDone = eap_tls_isDone;
284 eap->getKey = eap_tls_getKey;
285 eap->isSuccess = eap_tls_isSuccess;
286 eap->get_emsk = eap_tls_get_emsk;
288 ret = eap_server_method_register(eap);
290 eap_server_method_free(eap);