1 /*
2 * EAP peer method: EAP-TLS (RFC 2716)
3 * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
4 *
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.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eap_i.h"
19 #include "eap_tls_common.h"
20 #include "config_ssid.h"
21 #include "tls.h"
22
23
24 static void eap_tls_deinit(struct eap_sm *sm, void *priv);
25
26
27 struct eap_tls_data {
28 struct eap_ssl_data ssl;
29 u8 *key_data;
30 };
31
32
eap_tls_init(struct eap_sm * sm)33 static void * eap_tls_init(struct eap_sm *sm)
34 {
35 struct eap_tls_data *data;
36 struct wpa_ssid *config = eap_get_config(sm);
37 if (config == NULL ||
38 ((sm->init_phase2 ? config->private_key2 : config->private_key)
39 == NULL && config->engine == 0)) {
40 wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
41 return NULL;
42 }
43
44 data = os_zalloc(sizeof(*data));
45 if (data == NULL)
46 return NULL;
47
48 if (eap_tls_ssl_init(sm, &data->ssl, config)) {
49 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
50 eap_tls_deinit(sm, data);
51 if (config->engine) {
52 wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
53 "PIN");
54 eap_sm_request_pin(sm);
55 sm->ignore = TRUE;
56 } else if (config->private_key && !config->private_key_passwd)
57 {
58 wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
59 "key passphrase");
60 eap_sm_request_passphrase(sm);
61 sm->ignore = TRUE;
62 }
63 return NULL;
64 }
65
66 return data;
67 }
68
69
eap_tls_deinit(struct eap_sm * sm,void * priv)70 static void eap_tls_deinit(struct eap_sm *sm, void *priv)
71 {
72 struct eap_tls_data *data = priv;
73 if (data == NULL)
74 return;
75 eap_tls_ssl_deinit(sm, &data->ssl);
76 os_free(data->key_data);
77 os_free(data);
78 }
79
80
eap_tls_failure(struct eap_sm * sm,struct eap_tls_data * data,struct eap_method_ret * ret,int res,u8 * resp,u8 id,size_t * respDataLen)81 static u8 * eap_tls_failure(struct eap_sm *sm, struct eap_tls_data *data,
82 struct eap_method_ret *ret, int res, u8 *resp,
83 u8 id, size_t *respDataLen)
84 {
85 wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
86
87 ret->methodState = METHOD_DONE;
88 ret->decision = DECISION_FAIL;
89
90 if (res == -1) {
91 struct wpa_ssid *config = eap_get_config(sm);
92 if (config) {
93 /*
94 * The TLS handshake failed. So better forget the old
95 * PIN. It may be wrong, we cannot be sure but trying
96 * the wrong one again might block it on the card--so
97 * better ask the user again.
98 */
99 os_free(config->pin);
100 config->pin = NULL;
101 }
102 }
103
104 if (resp) {
105 /*
106 * This is likely an alert message, so send it instead of just
107 * ACKing the error.
108 */
109 return resp;
110 }
111
112 return eap_tls_build_ack(&data->ssl, respDataLen, id, EAP_TYPE_TLS, 0);
113 }
114
115
eap_tls_success(struct eap_sm * sm,struct eap_tls_data * data,struct eap_method_ret * ret)116 static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
117 struct eap_method_ret *ret)
118 {
119 wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
120
121 ret->methodState = METHOD_DONE;
122 ret->decision = DECISION_UNCOND_SUCC;
123
124 os_free(data->key_data);
125 data->key_data = eap_tls_derive_key(sm, &data->ssl,
126 "client EAP encryption",
127 EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
128 if (data->key_data) {
129 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
130 data->key_data, EAP_TLS_KEY_LEN);
131 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
132 data->key_data + EAP_TLS_KEY_LEN,
133 EAP_EMSK_LEN);
134 } else {
135 wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
136 }
137 }
138
139
eap_tls_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const u8 * reqData,size_t reqDataLen,size_t * respDataLen)140 static u8 * eap_tls_process(struct eap_sm *sm, void *priv,
141 struct eap_method_ret *ret,
142 const u8 *reqData, size_t reqDataLen,
143 size_t *respDataLen)
144 {
145 const struct eap_hdr *req;
146 size_t left;
147 int res;
148 u8 flags, *resp, id;
149 const u8 *pos;
150 struct eap_tls_data *data = priv;
151
152 pos = eap_tls_process_init(sm, &data->ssl, EAP_TYPE_TLS, ret,
153 reqData, reqDataLen, &left, &flags);
154 if (pos == NULL)
155 return NULL;
156 req = (const struct eap_hdr *) reqData;
157 id = req->identifier;
158
159 if (flags & EAP_TLS_FLAGS_START) {
160 wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
161 left = 0; /* make sure that this frame is empty, even though it
162 * should always be, anyway */
163 }
164
165 resp = NULL;
166 res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id, pos,
167 left, &resp, respDataLen);
168
169 if (res < 0) {
170 return eap_tls_failure(sm, data, ret, res, resp, id,
171 respDataLen);
172 }
173
174 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
175 eap_tls_success(sm, data, ret);
176
177 if (res == 1) {
178 return eap_tls_build_ack(&data->ssl, respDataLen, id,
179 EAP_TYPE_TLS, 0);
180 }
181
182 return resp;
183 }
184
185
eap_tls_has_reauth_data(struct eap_sm * sm,void * priv)186 static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
187 {
188 struct eap_tls_data *data = priv;
189 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
190 }
191
192
eap_tls_deinit_for_reauth(struct eap_sm * sm,void * priv)193 static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
194 {
195 }
196
197
eap_tls_init_for_reauth(struct eap_sm * sm,void * priv)198 static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
199 {
200 struct eap_tls_data *data = priv;
201 os_free(data->key_data);
202 data->key_data = NULL;
203 if (eap_tls_reauth_init(sm, &data->ssl)) {
204 os_free(data);
205 return NULL;
206 }
207 return priv;
208 }
209
210
eap_tls_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)211 static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
212 size_t buflen, int verbose)
213 {
214 struct eap_tls_data *data = priv;
215 return eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
216 }
217
218
eap_tls_isKeyAvailable(struct eap_sm * sm,void * priv)219 static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
220 {
221 struct eap_tls_data *data = priv;
222 return data->key_data != NULL;
223 }
224
225
eap_tls_getKey(struct eap_sm * sm,void * priv,size_t * len)226 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
227 {
228 struct eap_tls_data *data = priv;
229 u8 *key;
230
231 if (data->key_data == NULL)
232 return NULL;
233
234 key = os_malloc(EAP_TLS_KEY_LEN);
235 if (key == NULL)
236 return NULL;
237
238 *len = EAP_TLS_KEY_LEN;
239 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
240
241 return key;
242 }
243
244
eap_tls_get_emsk(struct eap_sm * sm,void * priv,size_t * len)245 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
246 {
247 struct eap_tls_data *data = priv;
248 u8 *key;
249
250 if (data->key_data == NULL)
251 return NULL;
252
253 key = os_malloc(EAP_EMSK_LEN);
254 if (key == NULL)
255 return NULL;
256
257 *len = EAP_EMSK_LEN;
258 os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
259
260 return key;
261 }
262
263
eap_peer_tls_register(void)264 int eap_peer_tls_register(void)
265 {
266 struct eap_method *eap;
267 int ret;
268
269 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
270 EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
271 if (eap == NULL)
272 return -1;
273
274 eap->init = eap_tls_init;
275 eap->deinit = eap_tls_deinit;
276 eap->process = eap_tls_process;
277 eap->isKeyAvailable = eap_tls_isKeyAvailable;
278 eap->getKey = eap_tls_getKey;
279 eap->get_status = eap_tls_get_status;
280 eap->has_reauth_data = eap_tls_has_reauth_data;
281 eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
282 eap->init_for_reauth = eap_tls_init_for_reauth;
283 eap->get_emsk = eap_tls_get_emsk;
284
285 ret = eap_peer_method_register(eap);
286 if (ret)
287 eap_peer_method_free(eap);
288 return ret;
289 }
290