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[FreeBSD/releng/10.0.git] / contrib / wpa / src / eap_peer / eap_tls.c
1 /*
2  * EAP peer method: EAP-TLS (RFC 2716)
3  * Copyright (c) 2004-2008, 2012, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/tls.h"
13 #include "eap_i.h"
14 #include "eap_tls_common.h"
15 #include "eap_config.h"
16
17
18 static void eap_tls_deinit(struct eap_sm *sm, void *priv);
19
20
21 struct eap_tls_data {
22         struct eap_ssl_data ssl;
23         u8 *key_data;
24         void *ssl_ctx;
25         u8 eap_type;
26 };
27
28
29 static void * eap_tls_init(struct eap_sm *sm)
30 {
31         struct eap_tls_data *data;
32         struct eap_peer_config *config = eap_get_config(sm);
33         if (config == NULL ||
34             ((sm->init_phase2 ? config->private_key2 : config->private_key)
35              == NULL &&
36              (sm->init_phase2 ? config->engine2 : config->engine) == 0)) {
37                 wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
38                 return NULL;
39         }
40
41         data = os_zalloc(sizeof(*data));
42         if (data == NULL)
43                 return NULL;
44
45         data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
46                 sm->ssl_ctx;
47
48         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TLS)) {
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         data->eap_type = EAP_TYPE_TLS;
67
68         return data;
69 }
70
71
72 #ifdef EAP_UNAUTH_TLS
73 static void * eap_unauth_tls_init(struct eap_sm *sm)
74 {
75         struct eap_tls_data *data;
76         struct eap_peer_config *config = eap_get_config(sm);
77
78         data = os_zalloc(sizeof(*data));
79         if (data == NULL)
80                 return NULL;
81
82         data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
83                 sm->ssl_ctx;
84
85         if (eap_peer_tls_ssl_init(sm, &data->ssl, config,
86                                   EAP_UNAUTH_TLS_TYPE)) {
87                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
88                 eap_tls_deinit(sm, data);
89                 return NULL;
90         }
91
92         data->eap_type = EAP_UNAUTH_TLS_TYPE;
93
94         return data;
95 }
96 #endif /* EAP_UNAUTH_TLS */
97
98
99 static void eap_tls_deinit(struct eap_sm *sm, void *priv)
100 {
101         struct eap_tls_data *data = priv;
102         if (data == NULL)
103                 return;
104         eap_peer_tls_ssl_deinit(sm, &data->ssl);
105         os_free(data->key_data);
106         os_free(data);
107 }
108
109
110 static struct wpabuf * eap_tls_failure(struct eap_sm *sm,
111                                        struct eap_tls_data *data,
112                                        struct eap_method_ret *ret, int res,
113                                        struct wpabuf *resp, u8 id)
114 {
115         wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
116
117         ret->methodState = METHOD_DONE;
118         ret->decision = DECISION_FAIL;
119
120         if (res == -1) {
121                 struct eap_peer_config *config = eap_get_config(sm);
122                 if (config) {
123                         /*
124                          * The TLS handshake failed. So better forget the old
125                          * PIN. It may be wrong, we cannot be sure but trying
126                          * the wrong one again might block it on the card--so
127                          * better ask the user again.
128                          */
129                         os_free(config->pin);
130                         config->pin = NULL;
131                 }
132         }
133
134         if (resp) {
135                 /*
136                  * This is likely an alert message, so send it instead of just
137                  * ACKing the error.
138                  */
139                 return resp;
140         }
141
142         return eap_peer_tls_build_ack(id, data->eap_type, 0);
143 }
144
145
146 static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
147                             struct eap_method_ret *ret)
148 {
149         wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
150
151         ret->methodState = METHOD_DONE;
152         ret->decision = DECISION_UNCOND_SUCC;
153
154         os_free(data->key_data);
155         data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
156                                                  "client EAP encryption",
157                                                  EAP_TLS_KEY_LEN +
158                                                  EAP_EMSK_LEN);
159         if (data->key_data) {
160                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
161                                 data->key_data, EAP_TLS_KEY_LEN);
162                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
163                                 data->key_data + EAP_TLS_KEY_LEN,
164                                 EAP_EMSK_LEN);
165         } else {
166                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
167         }
168 }
169
170
171 static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
172                                        struct eap_method_ret *ret,
173                                        const struct wpabuf *reqData)
174 {
175         size_t left;
176         int res;
177         struct wpabuf *resp;
178         u8 flags, id;
179         const u8 *pos;
180         struct eap_tls_data *data = priv;
181
182         pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
183                                         reqData, &left, &flags);
184         if (pos == NULL)
185                 return NULL;
186         id = eap_get_id(reqData);
187
188         if (flags & EAP_TLS_FLAGS_START) {
189                 wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
190                 left = 0; /* make sure that this frame is empty, even though it
191                            * should always be, anyway */
192         }
193
194         resp = NULL;
195         res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
196                                           id, pos, left, &resp);
197
198         if (res < 0) {
199                 return eap_tls_failure(sm, data, ret, res, resp, id);
200         }
201
202         if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
203                 eap_tls_success(sm, data, ret);
204
205         if (res == 1) {
206                 wpabuf_free(resp);
207                 return eap_peer_tls_build_ack(id, data->eap_type, 0);
208         }
209
210         return resp;
211 }
212
213
214 static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
215 {
216         struct eap_tls_data *data = priv;
217         return tls_connection_established(data->ssl_ctx, data->ssl.conn);
218 }
219
220
221 static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
222 {
223 }
224
225
226 static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
227 {
228         struct eap_tls_data *data = priv;
229         os_free(data->key_data);
230         data->key_data = NULL;
231         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
232                 os_free(data);
233                 return NULL;
234         }
235         return priv;
236 }
237
238
239 static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
240                               size_t buflen, int verbose)
241 {
242         struct eap_tls_data *data = priv;
243         return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
244 }
245
246
247 static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
248 {
249         struct eap_tls_data *data = priv;
250         return data->key_data != NULL;
251 }
252
253
254 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
255 {
256         struct eap_tls_data *data = priv;
257         u8 *key;
258
259         if (data->key_data == NULL)
260                 return NULL;
261
262         key = os_malloc(EAP_TLS_KEY_LEN);
263         if (key == NULL)
264                 return NULL;
265
266         *len = EAP_TLS_KEY_LEN;
267         os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
268
269         return key;
270 }
271
272
273 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
274 {
275         struct eap_tls_data *data = priv;
276         u8 *key;
277
278         if (data->key_data == NULL)
279                 return NULL;
280
281         key = os_malloc(EAP_EMSK_LEN);
282         if (key == NULL)
283                 return NULL;
284
285         *len = EAP_EMSK_LEN;
286         os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
287
288         return key;
289 }
290
291
292 int eap_peer_tls_register(void)
293 {
294         struct eap_method *eap;
295         int ret;
296
297         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
298                                     EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
299         if (eap == NULL)
300                 return -1;
301
302         eap->init = eap_tls_init;
303         eap->deinit = eap_tls_deinit;
304         eap->process = eap_tls_process;
305         eap->isKeyAvailable = eap_tls_isKeyAvailable;
306         eap->getKey = eap_tls_getKey;
307         eap->get_status = eap_tls_get_status;
308         eap->has_reauth_data = eap_tls_has_reauth_data;
309         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
310         eap->init_for_reauth = eap_tls_init_for_reauth;
311         eap->get_emsk = eap_tls_get_emsk;
312
313         ret = eap_peer_method_register(eap);
314         if (ret)
315                 eap_peer_method_free(eap);
316         return ret;
317 }
318
319
320 #ifdef EAP_UNAUTH_TLS
321 int eap_peer_unauth_tls_register(void)
322 {
323         struct eap_method *eap;
324         int ret;
325
326         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
327                                     EAP_VENDOR_UNAUTH_TLS,
328                                     EAP_VENDOR_TYPE_UNAUTH_TLS, "UNAUTH-TLS");
329         if (eap == NULL)
330                 return -1;
331
332         eap->init = eap_unauth_tls_init;
333         eap->deinit = eap_tls_deinit;
334         eap->process = eap_tls_process;
335         eap->isKeyAvailable = eap_tls_isKeyAvailable;
336         eap->getKey = eap_tls_getKey;
337         eap->get_status = eap_tls_get_status;
338         eap->has_reauth_data = eap_tls_has_reauth_data;
339         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
340         eap->init_for_reauth = eap_tls_init_for_reauth;
341         eap->get_emsk = eap_tls_get_emsk;
342
343         ret = eap_peer_method_register(eap);
344         if (ret)
345                 eap_peer_method_free(eap);
346         return ret;
347 }
348 #endif /* EAP_UNAUTH_TLS */