Line data Source code
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 : u8 *session_id;
25 : size_t id_len;
26 : void *ssl_ctx;
27 : u8 eap_type;
28 : };
29 :
30 :
31 20 : static void * eap_tls_init(struct eap_sm *sm)
32 : {
33 : struct eap_tls_data *data;
34 20 : struct eap_peer_config *config = eap_get_config(sm);
35 41 : if (config == NULL ||
36 40 : ((sm->init_phase2 ? config->private_key2 : config->private_key)
37 19 : == NULL &&
38 0 : (sm->init_phase2 ? config->engine2 : config->engine) == 0)) {
39 0 : wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
40 0 : return NULL;
41 : }
42 :
43 20 : data = os_zalloc(sizeof(*data));
44 20 : if (data == NULL)
45 0 : return NULL;
46 :
47 20 : data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
48 : sm->ssl_ctx;
49 :
50 20 : if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TLS)) {
51 1 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
52 1 : eap_tls_deinit(sm, data);
53 1 : if (config->engine) {
54 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
55 : "PIN");
56 0 : eap_sm_request_pin(sm);
57 0 : sm->ignore = TRUE;
58 1 : } else if (config->private_key && !config->private_key_passwd)
59 : {
60 1 : wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
61 : "key passphrase");
62 1 : eap_sm_request_passphrase(sm);
63 1 : sm->ignore = TRUE;
64 : }
65 1 : return NULL;
66 : }
67 :
68 19 : data->eap_type = EAP_TYPE_TLS;
69 :
70 19 : return data;
71 : }
72 :
73 :
74 : #ifdef EAP_UNAUTH_TLS
75 1 : static void * eap_unauth_tls_init(struct eap_sm *sm)
76 : {
77 : struct eap_tls_data *data;
78 1 : struct eap_peer_config *config = eap_get_config(sm);
79 :
80 1 : data = os_zalloc(sizeof(*data));
81 1 : if (data == NULL)
82 0 : return NULL;
83 :
84 1 : data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
85 : sm->ssl_ctx;
86 :
87 1 : if (eap_peer_tls_ssl_init(sm, &data->ssl, config,
88 : EAP_UNAUTH_TLS_TYPE)) {
89 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
90 0 : eap_tls_deinit(sm, data);
91 0 : return NULL;
92 : }
93 :
94 1 : data->eap_type = EAP_UNAUTH_TLS_TYPE;
95 :
96 1 : return data;
97 : }
98 : #endif /* EAP_UNAUTH_TLS */
99 :
100 :
101 : #ifdef CONFIG_HS20
102 2 : static void * eap_wfa_unauth_tls_init(struct eap_sm *sm)
103 : {
104 : struct eap_tls_data *data;
105 2 : struct eap_peer_config *config = eap_get_config(sm);
106 :
107 2 : data = os_zalloc(sizeof(*data));
108 2 : if (data == NULL)
109 0 : return NULL;
110 :
111 2 : data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
112 : sm->ssl_ctx;
113 :
114 2 : if (eap_peer_tls_ssl_init(sm, &data->ssl, config,
115 : EAP_WFA_UNAUTH_TLS_TYPE)) {
116 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
117 0 : eap_tls_deinit(sm, data);
118 0 : return NULL;
119 : }
120 :
121 2 : data->eap_type = EAP_WFA_UNAUTH_TLS_TYPE;
122 :
123 2 : return data;
124 : }
125 : #endif /* CONFIG_HS20 */
126 :
127 :
128 46 : static void eap_tls_free_key(struct eap_tls_data *data)
129 : {
130 46 : if (data->key_data) {
131 20 : bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
132 20 : data->key_data = NULL;
133 : }
134 46 : }
135 :
136 :
137 23 : static void eap_tls_deinit(struct eap_sm *sm, void *priv)
138 : {
139 23 : struct eap_tls_data *data = priv;
140 23 : if (data == NULL)
141 23 : return;
142 23 : eap_peer_tls_ssl_deinit(sm, &data->ssl);
143 23 : eap_tls_free_key(data);
144 23 : os_free(data->session_id);
145 23 : os_free(data);
146 : }
147 :
148 :
149 5 : static struct wpabuf * eap_tls_failure(struct eap_sm *sm,
150 : struct eap_tls_data *data,
151 : struct eap_method_ret *ret, int res,
152 : struct wpabuf *resp, u8 id)
153 : {
154 5 : wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
155 :
156 5 : ret->methodState = METHOD_DONE;
157 5 : ret->decision = DECISION_FAIL;
158 :
159 5 : if (res == -1) {
160 5 : struct eap_peer_config *config = eap_get_config(sm);
161 5 : if (config) {
162 : /*
163 : * The TLS handshake failed. So better forget the old
164 : * PIN. It may be wrong, we cannot be sure but trying
165 : * the wrong one again might block it on the card--so
166 : * better ask the user again.
167 : */
168 5 : os_free(config->pin);
169 5 : config->pin = NULL;
170 : }
171 : }
172 :
173 5 : if (resp) {
174 : /*
175 : * This is likely an alert message, so send it instead of just
176 : * ACKing the error.
177 : */
178 5 : return resp;
179 : }
180 :
181 0 : return eap_peer_tls_build_ack(id, data->eap_type, 0);
182 : }
183 :
184 :
185 20 : static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
186 : struct eap_method_ret *ret)
187 : {
188 20 : wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
189 :
190 20 : ret->methodState = METHOD_DONE;
191 20 : ret->decision = DECISION_UNCOND_SUCC;
192 :
193 20 : eap_tls_free_key(data);
194 20 : data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
195 : "client EAP encryption",
196 : EAP_TLS_KEY_LEN +
197 : EAP_EMSK_LEN);
198 20 : if (data->key_data) {
199 20 : wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
200 20 : data->key_data, EAP_TLS_KEY_LEN);
201 20 : wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
202 20 : data->key_data + EAP_TLS_KEY_LEN,
203 : EAP_EMSK_LEN);
204 : } else {
205 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
206 : }
207 :
208 20 : os_free(data->session_id);
209 20 : data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
210 : EAP_TYPE_TLS,
211 : &data->id_len);
212 20 : if (data->session_id) {
213 40 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived Session-Id",
214 20 : data->session_id, data->id_len);
215 : } else {
216 0 : wpa_printf(MSG_ERROR, "EAP-TLS: Failed to derive Session-Id");
217 : }
218 20 : }
219 :
220 :
221 111 : static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
222 : struct eap_method_ret *ret,
223 : const struct wpabuf *reqData)
224 : {
225 : size_t left;
226 : int res;
227 : struct wpabuf *resp;
228 : u8 flags, id;
229 : const u8 *pos;
230 111 : struct eap_tls_data *data = priv;
231 :
232 111 : pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
233 : reqData, &left, &flags);
234 111 : if (pos == NULL)
235 0 : return NULL;
236 111 : id = eap_get_id(reqData);
237 :
238 111 : if (flags & EAP_TLS_FLAGS_START) {
239 25 : wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
240 25 : left = 0; /* make sure that this frame is empty, even though it
241 : * should always be, anyway */
242 : }
243 :
244 111 : resp = NULL;
245 111 : res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
246 : id, pos, left, &resp);
247 :
248 111 : if (res < 0) {
249 5 : return eap_tls_failure(sm, data, ret, res, resp, id);
250 : }
251 :
252 106 : if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
253 20 : eap_tls_success(sm, data, ret);
254 :
255 106 : if (res == 1) {
256 46 : wpabuf_free(resp);
257 46 : return eap_peer_tls_build_ack(id, data->eap_type, 0);
258 : }
259 :
260 60 : return resp;
261 : }
262 :
263 :
264 8 : static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
265 : {
266 8 : struct eap_tls_data *data = priv;
267 8 : return tls_connection_established(data->ssl_ctx, data->ssl.conn);
268 : }
269 :
270 :
271 6 : static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
272 : {
273 6 : }
274 :
275 :
276 3 : static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
277 : {
278 3 : struct eap_tls_data *data = priv;
279 3 : eap_tls_free_key(data);
280 3 : os_free(data->session_id);
281 3 : data->session_id = NULL;
282 3 : if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
283 0 : os_free(data);
284 0 : return NULL;
285 : }
286 3 : return priv;
287 : }
288 :
289 :
290 10 : static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
291 : size_t buflen, int verbose)
292 : {
293 10 : struct eap_tls_data *data = priv;
294 10 : return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
295 : }
296 :
297 :
298 101 : static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
299 : {
300 101 : struct eap_tls_data *data = priv;
301 101 : return data->key_data != NULL;
302 : }
303 :
304 :
305 18 : static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
306 : {
307 18 : struct eap_tls_data *data = priv;
308 : u8 *key;
309 :
310 18 : if (data->key_data == NULL)
311 0 : return NULL;
312 :
313 18 : key = os_malloc(EAP_TLS_KEY_LEN);
314 18 : if (key == NULL)
315 0 : return NULL;
316 :
317 18 : *len = EAP_TLS_KEY_LEN;
318 18 : os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
319 :
320 18 : return key;
321 : }
322 :
323 :
324 1 : static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
325 : {
326 1 : struct eap_tls_data *data = priv;
327 : u8 *key;
328 :
329 1 : if (data->key_data == NULL)
330 0 : return NULL;
331 :
332 1 : key = os_malloc(EAP_EMSK_LEN);
333 1 : if (key == NULL)
334 0 : return NULL;
335 :
336 1 : *len = EAP_EMSK_LEN;
337 1 : os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
338 :
339 1 : return key;
340 : }
341 :
342 :
343 14 : static u8 * eap_tls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
344 : {
345 14 : struct eap_tls_data *data = priv;
346 : u8 *id;
347 :
348 14 : if (data->session_id == NULL)
349 0 : return NULL;
350 :
351 14 : id = os_malloc(data->id_len);
352 14 : if (id == NULL)
353 0 : return NULL;
354 :
355 14 : *len = data->id_len;
356 14 : os_memcpy(id, data->session_id, data->id_len);
357 :
358 14 : return id;
359 : }
360 :
361 :
362 30 : int eap_peer_tls_register(void)
363 : {
364 : struct eap_method *eap;
365 : int ret;
366 :
367 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
368 : EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
369 30 : if (eap == NULL)
370 0 : return -1;
371 :
372 30 : eap->init = eap_tls_init;
373 30 : eap->deinit = eap_tls_deinit;
374 30 : eap->process = eap_tls_process;
375 30 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
376 30 : eap->getKey = eap_tls_getKey;
377 30 : eap->getSessionId = eap_tls_get_session_id;
378 30 : eap->get_status = eap_tls_get_status;
379 30 : eap->has_reauth_data = eap_tls_has_reauth_data;
380 30 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
381 30 : eap->init_for_reauth = eap_tls_init_for_reauth;
382 30 : eap->get_emsk = eap_tls_get_emsk;
383 :
384 30 : ret = eap_peer_method_register(eap);
385 30 : if (ret)
386 0 : eap_peer_method_free(eap);
387 30 : return ret;
388 : }
389 :
390 :
391 : #ifdef EAP_UNAUTH_TLS
392 30 : int eap_peer_unauth_tls_register(void)
393 : {
394 : struct eap_method *eap;
395 : int ret;
396 :
397 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
398 : EAP_VENDOR_UNAUTH_TLS,
399 : EAP_VENDOR_TYPE_UNAUTH_TLS, "UNAUTH-TLS");
400 30 : if (eap == NULL)
401 0 : return -1;
402 :
403 30 : eap->init = eap_unauth_tls_init;
404 30 : eap->deinit = eap_tls_deinit;
405 30 : eap->process = eap_tls_process;
406 30 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
407 30 : eap->getKey = eap_tls_getKey;
408 30 : eap->get_status = eap_tls_get_status;
409 30 : eap->has_reauth_data = eap_tls_has_reauth_data;
410 30 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
411 30 : eap->init_for_reauth = eap_tls_init_for_reauth;
412 30 : eap->get_emsk = eap_tls_get_emsk;
413 :
414 30 : ret = eap_peer_method_register(eap);
415 30 : if (ret)
416 0 : eap_peer_method_free(eap);
417 30 : return ret;
418 : }
419 : #endif /* EAP_UNAUTH_TLS */
420 :
421 :
422 : #ifdef CONFIG_HS20
423 30 : int eap_peer_wfa_unauth_tls_register(void)
424 : {
425 : struct eap_method *eap;
426 : int ret;
427 :
428 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
429 : EAP_VENDOR_WFA_NEW,
430 : EAP_VENDOR_WFA_UNAUTH_TLS,
431 : "WFA-UNAUTH-TLS");
432 30 : if (eap == NULL)
433 0 : return -1;
434 :
435 30 : eap->init = eap_wfa_unauth_tls_init;
436 30 : eap->deinit = eap_tls_deinit;
437 30 : eap->process = eap_tls_process;
438 30 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
439 30 : eap->getKey = eap_tls_getKey;
440 30 : eap->get_status = eap_tls_get_status;
441 30 : eap->has_reauth_data = eap_tls_has_reauth_data;
442 30 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
443 30 : eap->init_for_reauth = eap_tls_init_for_reauth;
444 30 : eap->get_emsk = eap_tls_get_emsk;
445 :
446 30 : ret = eap_peer_method_register(eap);
447 30 : if (ret)
448 0 : eap_peer_method_free(eap);
449 30 : return ret;
450 : }
451 : #endif /* CONFIG_HS20 */
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