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 45 : static void * eap_tls_init(struct eap_sm *sm)
32 : {
33 : struct eap_tls_data *data;
34 45 : struct eap_peer_config *config = eap_get_config(sm);
35 91 : if (config == NULL ||
36 90 : ((sm->init_phase2 ? config->private_key2 : config->private_key)
37 44 : == 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 45 : data = os_zalloc(sizeof(*data));
44 45 : if (data == NULL)
45 0 : return NULL;
46 :
47 45 : data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
48 : sm->ssl_ctx;
49 :
50 45 : if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TLS)) {
51 5 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
52 5 : eap_tls_deinit(sm, data);
53 5 : 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 5 : } else if (config->private_key && !config->private_key_passwd)
59 : {
60 5 : wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
61 : "key passphrase");
62 5 : eap_sm_request_passphrase(sm);
63 5 : sm->ignore = TRUE;
64 : }
65 5 : return NULL;
66 : }
67 :
68 40 : data->eap_type = EAP_TYPE_TLS;
69 :
70 40 : 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 :
128 103 : static void eap_tls_free_key(struct eap_tls_data *data)
129 : {
130 103 : if (data->key_data) {
131 45 : bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
132 45 : data->key_data = NULL;
133 : }
134 103 : }
135 :
136 :
137 48 : static void eap_tls_deinit(struct eap_sm *sm, void *priv)
138 : {
139 48 : struct eap_tls_data *data = priv;
140 48 : if (data == NULL)
141 48 : return;
142 48 : eap_peer_tls_ssl_deinit(sm, &data->ssl);
143 48 : eap_tls_free_key(data);
144 48 : os_free(data->session_id);
145 48 : os_free(data);
146 : }
147 :
148 :
149 7 : 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 7 : wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
155 :
156 7 : ret->methodState = METHOD_DONE;
157 7 : ret->decision = DECISION_FAIL;
158 :
159 7 : if (resp) {
160 : /*
161 : * This is likely an alert message, so send it instead of just
162 : * ACKing the error.
163 : */
164 7 : return resp;
165 : }
166 :
167 0 : return eap_peer_tls_build_ack(id, data->eap_type, 0);
168 : }
169 :
170 :
171 45 : static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
172 : struct eap_method_ret *ret)
173 : {
174 45 : wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
175 :
176 45 : ret->methodState = METHOD_DONE;
177 45 : ret->decision = DECISION_UNCOND_SUCC;
178 :
179 45 : eap_tls_free_key(data);
180 45 : data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
181 : "client EAP encryption",
182 : EAP_TLS_KEY_LEN +
183 : EAP_EMSK_LEN);
184 45 : if (data->key_data) {
185 45 : wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
186 45 : data->key_data, EAP_TLS_KEY_LEN);
187 45 : wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
188 45 : data->key_data + EAP_TLS_KEY_LEN,
189 : EAP_EMSK_LEN);
190 : } else {
191 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
192 : }
193 :
194 45 : os_free(data->session_id);
195 45 : data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
196 : EAP_TYPE_TLS,
197 : &data->id_len);
198 45 : if (data->session_id) {
199 90 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived Session-Id",
200 45 : data->session_id, data->id_len);
201 : } else {
202 0 : wpa_printf(MSG_ERROR, "EAP-TLS: Failed to derive Session-Id");
203 : }
204 45 : }
205 :
206 :
207 221 : static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
208 : struct eap_method_ret *ret,
209 : const struct wpabuf *reqData)
210 : {
211 : size_t left;
212 : int res;
213 : struct wpabuf *resp;
214 : u8 flags, id;
215 : const u8 *pos;
216 221 : struct eap_tls_data *data = priv;
217 : struct wpabuf msg;
218 :
219 221 : pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
220 : reqData, &left, &flags);
221 221 : if (pos == NULL)
222 0 : return NULL;
223 221 : id = eap_get_id(reqData);
224 :
225 221 : if (flags & EAP_TLS_FLAGS_START) {
226 53 : wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
227 53 : left = 0; /* make sure that this frame is empty, even though it
228 : * should always be, anyway */
229 : }
230 :
231 221 : resp = NULL;
232 221 : wpabuf_set(&msg, pos, left);
233 221 : res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
234 : id, &msg, &resp);
235 :
236 221 : if (res < 0) {
237 7 : return eap_tls_failure(sm, data, ret, res, resp, id);
238 : }
239 :
240 214 : if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
241 45 : eap_tls_success(sm, data, ret);
242 :
243 214 : if (res == 1) {
244 81 : wpabuf_free(resp);
245 81 : return eap_peer_tls_build_ack(id, data->eap_type, 0);
246 : }
247 :
248 133 : return resp;
249 : }
250 :
251 :
252 22 : static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
253 : {
254 22 : struct eap_tls_data *data = priv;
255 22 : return tls_connection_established(data->ssl_ctx, data->ssl.conn);
256 : }
257 :
258 :
259 13 : static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
260 : {
261 13 : }
262 :
263 :
264 10 : static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
265 : {
266 10 : struct eap_tls_data *data = priv;
267 10 : eap_tls_free_key(data);
268 10 : os_free(data->session_id);
269 10 : data->session_id = NULL;
270 10 : if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
271 0 : os_free(data);
272 0 : return NULL;
273 : }
274 10 : return priv;
275 : }
276 :
277 :
278 41 : static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
279 : size_t buflen, int verbose)
280 : {
281 41 : struct eap_tls_data *data = priv;
282 41 : return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
283 : }
284 :
285 :
286 211 : static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
287 : {
288 211 : struct eap_tls_data *data = priv;
289 211 : return data->key_data != NULL;
290 : }
291 :
292 :
293 43 : static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
294 : {
295 43 : struct eap_tls_data *data = priv;
296 : u8 *key;
297 :
298 43 : if (data->key_data == NULL)
299 0 : return NULL;
300 :
301 43 : key = os_malloc(EAP_TLS_KEY_LEN);
302 43 : if (key == NULL)
303 0 : return NULL;
304 :
305 43 : *len = EAP_TLS_KEY_LEN;
306 43 : os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
307 :
308 43 : return key;
309 : }
310 :
311 :
312 1 : static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
313 : {
314 1 : struct eap_tls_data *data = priv;
315 : u8 *key;
316 :
317 1 : if (data->key_data == NULL)
318 0 : return NULL;
319 :
320 1 : key = os_malloc(EAP_EMSK_LEN);
321 1 : if (key == NULL)
322 0 : return NULL;
323 :
324 1 : *len = EAP_EMSK_LEN;
325 1 : os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
326 :
327 1 : return key;
328 : }
329 :
330 :
331 39 : static u8 * eap_tls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
332 : {
333 39 : struct eap_tls_data *data = priv;
334 : u8 *id;
335 :
336 39 : if (data->session_id == NULL)
337 0 : return NULL;
338 :
339 39 : id = os_malloc(data->id_len);
340 39 : if (id == NULL)
341 0 : return NULL;
342 :
343 39 : *len = data->id_len;
344 39 : os_memcpy(id, data->session_id, data->id_len);
345 :
346 39 : return id;
347 : }
348 :
349 :
350 49 : int eap_peer_tls_register(void)
351 : {
352 : struct eap_method *eap;
353 : int ret;
354 :
355 49 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
356 : EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
357 49 : if (eap == NULL)
358 0 : return -1;
359 :
360 49 : eap->init = eap_tls_init;
361 49 : eap->deinit = eap_tls_deinit;
362 49 : eap->process = eap_tls_process;
363 49 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
364 49 : eap->getKey = eap_tls_getKey;
365 49 : eap->getSessionId = eap_tls_get_session_id;
366 49 : eap->get_status = eap_tls_get_status;
367 49 : eap->has_reauth_data = eap_tls_has_reauth_data;
368 49 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
369 49 : eap->init_for_reauth = eap_tls_init_for_reauth;
370 49 : eap->get_emsk = eap_tls_get_emsk;
371 :
372 49 : ret = eap_peer_method_register(eap);
373 49 : if (ret)
374 0 : eap_peer_method_free(eap);
375 49 : return ret;
376 : }
377 :
378 :
379 : #ifdef EAP_UNAUTH_TLS
380 49 : int eap_peer_unauth_tls_register(void)
381 : {
382 : struct eap_method *eap;
383 : int ret;
384 :
385 49 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
386 : EAP_VENDOR_UNAUTH_TLS,
387 : EAP_VENDOR_TYPE_UNAUTH_TLS, "UNAUTH-TLS");
388 49 : if (eap == NULL)
389 0 : return -1;
390 :
391 49 : eap->init = eap_unauth_tls_init;
392 49 : eap->deinit = eap_tls_deinit;
393 49 : eap->process = eap_tls_process;
394 49 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
395 49 : eap->getKey = eap_tls_getKey;
396 49 : eap->get_status = eap_tls_get_status;
397 49 : eap->has_reauth_data = eap_tls_has_reauth_data;
398 49 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
399 49 : eap->init_for_reauth = eap_tls_init_for_reauth;
400 49 : eap->get_emsk = eap_tls_get_emsk;
401 :
402 49 : ret = eap_peer_method_register(eap);
403 49 : if (ret)
404 0 : eap_peer_method_free(eap);
405 49 : return ret;
406 : }
407 : #endif /* EAP_UNAUTH_TLS */
408 :
409 :
410 : #ifdef CONFIG_HS20
411 49 : int eap_peer_wfa_unauth_tls_register(void)
412 : {
413 : struct eap_method *eap;
414 : int ret;
415 :
416 49 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
417 : EAP_VENDOR_WFA_NEW,
418 : EAP_VENDOR_WFA_UNAUTH_TLS,
419 : "WFA-UNAUTH-TLS");
420 49 : if (eap == NULL)
421 0 : return -1;
422 :
423 49 : eap->init = eap_wfa_unauth_tls_init;
424 49 : eap->deinit = eap_tls_deinit;
425 49 : eap->process = eap_tls_process;
426 49 : eap->isKeyAvailable = eap_tls_isKeyAvailable;
427 49 : eap->getKey = eap_tls_getKey;
428 49 : eap->get_status = eap_tls_get_status;
429 49 : eap->has_reauth_data = eap_tls_has_reauth_data;
430 49 : eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
431 49 : eap->init_for_reauth = eap_tls_init_for_reauth;
432 49 : eap->get_emsk = eap_tls_get_emsk;
433 :
434 49 : ret = eap_peer_method_register(eap);
435 49 : if (ret)
436 0 : eap_peer_method_free(eap);
437 49 : return ret;
438 : }
439 : #endif /* CONFIG_HS20 */
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