Line data Source code
1 : /*
2 : * hostapd / EAP-TLS (RFC 2716)
3 : * Copyright (c) 2004-2008, 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 "eap_i.h"
13 : #include "eap_tls_common.h"
14 : #include "crypto/tls.h"
15 :
16 :
17 : static void eap_tls_reset(struct eap_sm *sm, void *priv);
18 :
19 :
20 : struct eap_tls_data {
21 : struct eap_ssl_data ssl;
22 : enum { START, CONTINUE, SUCCESS, FAILURE } state;
23 : int established;
24 : u8 eap_type;
25 : };
26 :
27 :
28 346 : static const char * eap_tls_state_txt(int state)
29 : {
30 346 : switch (state) {
31 : case START:
32 94 : return "START";
33 : case CONTINUE:
34 173 : return "CONTINUE";
35 : case SUCCESS:
36 67 : return "SUCCESS";
37 : case FAILURE:
38 12 : return "FAILURE";
39 : default:
40 0 : return "Unknown?!";
41 : }
42 : }
43 :
44 :
45 173 : static void eap_tls_state(struct eap_tls_data *data, int state)
46 : {
47 346 : wpa_printf(MSG_DEBUG, "EAP-TLS: %s -> %s",
48 173 : eap_tls_state_txt(data->state),
49 : eap_tls_state_txt(state));
50 173 : data->state = state;
51 173 : if (state == FAILURE)
52 12 : tls_connection_remove_session(data->ssl.conn);
53 173 : }
54 :
55 :
56 63 : static void eap_tls_valid_session(struct eap_sm *sm, struct eap_tls_data *data)
57 : {
58 : struct wpabuf *buf;
59 :
60 63 : if (!sm->tls_session_lifetime)
61 59 : return;
62 :
63 4 : buf = wpabuf_alloc(1);
64 4 : if (!buf)
65 0 : return;
66 4 : wpabuf_put_u8(buf, data->eap_type);
67 4 : tls_connection_set_success_data(data->ssl.conn, buf);
68 : }
69 :
70 :
71 86 : static void * eap_tls_init(struct eap_sm *sm)
72 : {
73 : struct eap_tls_data *data;
74 :
75 86 : data = os_zalloc(sizeof(*data));
76 86 : if (data == NULL)
77 0 : return NULL;
78 86 : data->state = START;
79 :
80 86 : if (eap_server_tls_ssl_init(sm, &data->ssl, 1, EAP_TYPE_TLS)) {
81 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
82 0 : eap_tls_reset(sm, data);
83 0 : return NULL;
84 : }
85 :
86 86 : data->eap_type = EAP_TYPE_TLS;
87 :
88 86 : return data;
89 : }
90 :
91 :
92 : #ifdef EAP_SERVER_UNAUTH_TLS
93 4 : static void * eap_unauth_tls_init(struct eap_sm *sm)
94 : {
95 : struct eap_tls_data *data;
96 :
97 4 : data = os_zalloc(sizeof(*data));
98 4 : if (data == NULL)
99 0 : return NULL;
100 4 : data->state = START;
101 :
102 4 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_UNAUTH_TLS_TYPE)) {
103 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
104 0 : eap_tls_reset(sm, data);
105 0 : return NULL;
106 : }
107 :
108 4 : data->eap_type = EAP_UNAUTH_TLS_TYPE;
109 4 : return data;
110 : }
111 : #endif /* EAP_SERVER_UNAUTH_TLS */
112 :
113 :
114 : #ifdef CONFIG_HS20
115 4 : static void * eap_wfa_unauth_tls_init(struct eap_sm *sm)
116 : {
117 : struct eap_tls_data *data;
118 :
119 4 : data = os_zalloc(sizeof(*data));
120 4 : if (data == NULL)
121 0 : return NULL;
122 4 : data->state = START;
123 :
124 4 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0,
125 : EAP_WFA_UNAUTH_TLS_TYPE)) {
126 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
127 0 : eap_tls_reset(sm, data);
128 0 : return NULL;
129 : }
130 :
131 4 : data->eap_type = EAP_WFA_UNAUTH_TLS_TYPE;
132 4 : return data;
133 : }
134 : #endif /* CONFIG_HS20 */
135 :
136 :
137 94 : static void eap_tls_reset(struct eap_sm *sm, void *priv)
138 : {
139 94 : struct eap_tls_data *data = priv;
140 94 : if (data == NULL)
141 94 : return;
142 94 : eap_server_tls_ssl_deinit(sm, &data->ssl);
143 94 : os_free(data);
144 : }
145 :
146 :
147 94 : static struct wpabuf * eap_tls_build_start(struct eap_sm *sm,
148 : struct eap_tls_data *data, u8 id)
149 : {
150 : struct wpabuf *req;
151 :
152 94 : req = eap_tls_msg_alloc(data->eap_type, 1, EAP_CODE_REQUEST, id);
153 94 : if (req == NULL) {
154 0 : wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
155 : "request");
156 0 : eap_tls_state(data, FAILURE);
157 0 : return NULL;
158 : }
159 :
160 94 : wpabuf_put_u8(req, EAP_TLS_FLAGS_START);
161 :
162 94 : eap_tls_state(data, CONTINUE);
163 :
164 94 : return req;
165 : }
166 :
167 :
168 462 : static struct wpabuf * eap_tls_buildReq(struct eap_sm *sm, void *priv, u8 id)
169 : {
170 462 : struct eap_tls_data *data = priv;
171 : struct wpabuf *res;
172 :
173 462 : if (data->ssl.state == FRAG_ACK) {
174 58 : return eap_server_tls_build_ack(id, data->eap_type, 0);
175 : }
176 :
177 404 : if (data->ssl.state == WAIT_FRAG_ACK) {
178 166 : res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0,
179 : id);
180 166 : goto check_established;
181 : }
182 :
183 238 : switch (data->state) {
184 : case START:
185 94 : return eap_tls_build_start(sm, data, id);
186 : case CONTINUE:
187 144 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
188 63 : data->established = 1;
189 144 : break;
190 : default:
191 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
192 0 : __func__, data->state);
193 0 : return NULL;
194 : }
195 :
196 144 : res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0, id);
197 :
198 : check_established:
199 310 : if (data->established && data->ssl.state != WAIT_FRAG_ACK) {
200 : /* TLS handshake has been completed and there are no more
201 : * fragments waiting to be sent out. */
202 63 : wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
203 63 : eap_tls_state(data, SUCCESS);
204 63 : eap_tls_valid_session(sm, data);
205 : }
206 :
207 310 : return res;
208 : }
209 :
210 :
211 447 : static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
212 : struct wpabuf *respData)
213 : {
214 447 : struct eap_tls_data *data = priv;
215 : const u8 *pos;
216 : size_t len;
217 :
218 447 : if (data->eap_type == EAP_UNAUTH_TLS_TYPE)
219 8 : pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
220 : EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
221 : &len);
222 439 : else if (data->eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
223 8 : pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
224 : EAP_VENDOR_WFA_UNAUTH_TLS, respData,
225 : &len);
226 : else
227 431 : pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_type,
228 : respData, &len);
229 447 : if (pos == NULL || len < 1) {
230 0 : wpa_printf(MSG_INFO, "EAP-TLS: Invalid frame");
231 0 : return TRUE;
232 : }
233 :
234 447 : return FALSE;
235 : }
236 :
237 :
238 223 : static void eap_tls_process_msg(struct eap_sm *sm, void *priv,
239 : const struct wpabuf *respData)
240 : {
241 223 : struct eap_tls_data *data = priv;
242 223 : if (data->state == SUCCESS && wpabuf_len(data->ssl.tls_in) == 0) {
243 63 : wpa_printf(MSG_DEBUG, "EAP-TLS: Client acknowledged final TLS "
244 : "handshake message");
245 286 : return;
246 : }
247 160 : if (eap_server_tls_phase1(sm, &data->ssl) < 0)
248 12 : eap_tls_state(data, FAILURE);
249 : }
250 :
251 :
252 447 : static void eap_tls_process(struct eap_sm *sm, void *priv,
253 : struct wpabuf *respData)
254 : {
255 447 : struct eap_tls_data *data = priv;
256 : const struct wpabuf *buf;
257 : const u8 *pos;
258 :
259 447 : if (eap_server_tls_process(sm, &data->ssl, respData, data,
260 447 : data->eap_type, NULL, eap_tls_process_msg) <
261 : 0) {
262 0 : eap_tls_state(data, FAILURE);
263 0 : return;
264 : }
265 :
266 577 : if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
267 130 : !tls_connection_resumed(sm->ssl_ctx, data->ssl.conn))
268 443 : return;
269 :
270 4 : buf = tls_connection_get_success_data(data->ssl.conn);
271 4 : if (!buf || wpabuf_len(buf) < 1) {
272 0 : wpa_printf(MSG_DEBUG,
273 : "EAP-TLS: No success data in resumed session - reject attempt");
274 0 : eap_tls_state(data, FAILURE);
275 0 : return;
276 : }
277 :
278 4 : pos = wpabuf_head(buf);
279 4 : if (*pos != data->eap_type) {
280 0 : wpa_printf(MSG_DEBUG,
281 : "EAP-TLS: Resumed session for another EAP type (%u) - reject attempt",
282 0 : *pos);
283 0 : eap_tls_state(data, FAILURE);
284 0 : return;
285 : }
286 :
287 4 : wpa_printf(MSG_DEBUG,
288 : "EAP-TLS: Resuming previous session");
289 4 : eap_tls_state(data, SUCCESS);
290 4 : tls_connection_set_success_data_resumed(data->ssl.conn);
291 : }
292 :
293 :
294 459 : static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
295 : {
296 459 : struct eap_tls_data *data = priv;
297 459 : return data->state == SUCCESS || data->state == FAILURE;
298 : }
299 :
300 :
301 79 : static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
302 : {
303 79 : struct eap_tls_data *data = priv;
304 : u8 *eapKeyData;
305 :
306 79 : if (data->state != SUCCESS)
307 12 : return NULL;
308 :
309 67 : eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
310 : "client EAP encryption",
311 : EAP_TLS_KEY_LEN);
312 67 : if (eapKeyData) {
313 67 : *len = EAP_TLS_KEY_LEN;
314 67 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
315 : eapKeyData, EAP_TLS_KEY_LEN);
316 : } else {
317 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
318 : }
319 :
320 67 : return eapKeyData;
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 *eapKeyData, *emsk;
328 :
329 1 : if (data->state != SUCCESS)
330 0 : return NULL;
331 :
332 1 : eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
333 : "client EAP encryption",
334 : EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
335 1 : if (eapKeyData) {
336 1 : emsk = os_malloc(EAP_EMSK_LEN);
337 1 : if (emsk)
338 1 : os_memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
339 : EAP_EMSK_LEN);
340 1 : bin_clear_free(eapKeyData, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
341 : } else
342 0 : emsk = NULL;
343 :
344 1 : if (emsk) {
345 1 : *len = EAP_EMSK_LEN;
346 1 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
347 : emsk, EAP_EMSK_LEN);
348 : } else {
349 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
350 : }
351 :
352 1 : return emsk;
353 : }
354 :
355 :
356 91 : static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
357 : {
358 91 : struct eap_tls_data *data = priv;
359 91 : return data->state == SUCCESS;
360 : }
361 :
362 :
363 72 : static u8 * eap_tls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
364 : {
365 72 : struct eap_tls_data *data = priv;
366 :
367 72 : if (data->state != SUCCESS)
368 12 : return NULL;
369 :
370 60 : return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_TLS,
371 : len);
372 : }
373 :
374 :
375 25 : int eap_server_tls_register(void)
376 : {
377 : struct eap_method *eap;
378 :
379 25 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
380 : EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
381 25 : if (eap == NULL)
382 0 : return -1;
383 :
384 25 : eap->init = eap_tls_init;
385 25 : eap->reset = eap_tls_reset;
386 25 : eap->buildReq = eap_tls_buildReq;
387 25 : eap->check = eap_tls_check;
388 25 : eap->process = eap_tls_process;
389 25 : eap->isDone = eap_tls_isDone;
390 25 : eap->getKey = eap_tls_getKey;
391 25 : eap->isSuccess = eap_tls_isSuccess;
392 25 : eap->get_emsk = eap_tls_get_emsk;
393 25 : eap->getSessionId = eap_tls_get_session_id;
394 :
395 25 : return eap_server_method_register(eap);
396 : }
397 :
398 :
399 : #ifdef EAP_SERVER_UNAUTH_TLS
400 25 : int eap_server_unauth_tls_register(void)
401 : {
402 : struct eap_method *eap;
403 :
404 25 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
405 : EAP_VENDOR_UNAUTH_TLS,
406 : EAP_VENDOR_TYPE_UNAUTH_TLS,
407 : "UNAUTH-TLS");
408 25 : if (eap == NULL)
409 0 : return -1;
410 :
411 25 : eap->init = eap_unauth_tls_init;
412 25 : eap->reset = eap_tls_reset;
413 25 : eap->buildReq = eap_tls_buildReq;
414 25 : eap->check = eap_tls_check;
415 25 : eap->process = eap_tls_process;
416 25 : eap->isDone = eap_tls_isDone;
417 25 : eap->getKey = eap_tls_getKey;
418 25 : eap->isSuccess = eap_tls_isSuccess;
419 25 : eap->get_emsk = eap_tls_get_emsk;
420 :
421 25 : return eap_server_method_register(eap);
422 : }
423 : #endif /* EAP_SERVER_UNAUTH_TLS */
424 :
425 :
426 : #ifdef CONFIG_HS20
427 25 : int eap_server_wfa_unauth_tls_register(void)
428 : {
429 : struct eap_method *eap;
430 :
431 25 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
432 : EAP_VENDOR_WFA_NEW,
433 : EAP_VENDOR_WFA_UNAUTH_TLS,
434 : "WFA-UNAUTH-TLS");
435 25 : if (eap == NULL)
436 0 : return -1;
437 :
438 25 : eap->init = eap_wfa_unauth_tls_init;
439 25 : eap->reset = eap_tls_reset;
440 25 : eap->buildReq = eap_tls_buildReq;
441 25 : eap->check = eap_tls_check;
442 25 : eap->process = eap_tls_process;
443 25 : eap->isDone = eap_tls_isDone;
444 25 : eap->getKey = eap_tls_getKey;
445 25 : eap->isSuccess = eap_tls_isSuccess;
446 25 : eap->get_emsk = eap_tls_get_emsk;
447 :
448 25 : return eap_server_method_register(eap);
449 : }
450 : #endif /* CONFIG_HS20 */
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