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 76 : static const char * eap_tls_state_txt(int state)
29 : {
30 76 : switch (state) {
31 : case START:
32 19 : return "START";
33 : case CONTINUE:
34 38 : return "CONTINUE";
35 : case SUCCESS:
36 16 : return "SUCCESS";
37 : case FAILURE:
38 3 : return "FAILURE";
39 : default:
40 0 : return "Unknown?!";
41 : }
42 : }
43 :
44 :
45 38 : static void eap_tls_state(struct eap_tls_data *data, int state)
46 : {
47 76 : wpa_printf(MSG_DEBUG, "EAP-TLS: %s -> %s",
48 38 : eap_tls_state_txt(data->state),
49 : eap_tls_state_txt(state));
50 38 : data->state = state;
51 38 : }
52 :
53 :
54 15 : static void * eap_tls_init(struct eap_sm *sm)
55 : {
56 : struct eap_tls_data *data;
57 :
58 15 : data = os_zalloc(sizeof(*data));
59 15 : if (data == NULL)
60 0 : return NULL;
61 15 : data->state = START;
62 :
63 15 : if (eap_server_tls_ssl_init(sm, &data->ssl, 1)) {
64 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
65 0 : eap_tls_reset(sm, data);
66 0 : return NULL;
67 : }
68 :
69 15 : data->eap_type = EAP_TYPE_TLS;
70 :
71 15 : return data;
72 : }
73 :
74 :
75 : #ifdef EAP_SERVER_UNAUTH_TLS
76 2 : static void * eap_unauth_tls_init(struct eap_sm *sm)
77 : {
78 : struct eap_tls_data *data;
79 :
80 2 : data = os_zalloc(sizeof(*data));
81 2 : if (data == NULL)
82 0 : return NULL;
83 2 : data->state = START;
84 :
85 2 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
86 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
87 0 : eap_tls_reset(sm, data);
88 0 : return NULL;
89 : }
90 :
91 2 : data->eap_type = EAP_UNAUTH_TLS_TYPE;
92 2 : return data;
93 : }
94 : #endif /* EAP_SERVER_UNAUTH_TLS */
95 :
96 :
97 : #ifdef CONFIG_HS20
98 2 : static void * eap_wfa_unauth_tls_init(struct eap_sm *sm)
99 : {
100 : struct eap_tls_data *data;
101 :
102 2 : data = os_zalloc(sizeof(*data));
103 2 : if (data == NULL)
104 0 : return NULL;
105 2 : data->state = START;
106 :
107 2 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
108 0 : wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
109 0 : eap_tls_reset(sm, data);
110 0 : return NULL;
111 : }
112 :
113 2 : data->eap_type = EAP_WFA_UNAUTH_TLS_TYPE;
114 2 : return data;
115 : }
116 : #endif /* CONFIG_HS20 */
117 :
118 :
119 19 : static void eap_tls_reset(struct eap_sm *sm, void *priv)
120 : {
121 19 : struct eap_tls_data *data = priv;
122 19 : if (data == NULL)
123 19 : return;
124 19 : eap_server_tls_ssl_deinit(sm, &data->ssl);
125 19 : os_free(data);
126 : }
127 :
128 :
129 19 : static struct wpabuf * eap_tls_build_start(struct eap_sm *sm,
130 : struct eap_tls_data *data, u8 id)
131 : {
132 : struct wpabuf *req;
133 :
134 19 : req = eap_tls_msg_alloc(data->eap_type, 1, EAP_CODE_REQUEST, id);
135 19 : if (req == NULL) {
136 0 : wpa_printf(MSG_ERROR, "EAP-TLS: Failed to allocate memory for "
137 : "request");
138 0 : eap_tls_state(data, FAILURE);
139 0 : return NULL;
140 : }
141 :
142 19 : wpabuf_put_u8(req, EAP_TLS_FLAGS_START);
143 :
144 19 : eap_tls_state(data, CONTINUE);
145 :
146 19 : return req;
147 : }
148 :
149 :
150 81 : static struct wpabuf * eap_tls_buildReq(struct eap_sm *sm, void *priv, u8 id)
151 : {
152 81 : struct eap_tls_data *data = priv;
153 : struct wpabuf *res;
154 :
155 81 : if (data->ssl.state == FRAG_ACK) {
156 12 : return eap_server_tls_build_ack(id, data->eap_type, 0);
157 : }
158 :
159 69 : if (data->ssl.state == WAIT_FRAG_ACK) {
160 15 : res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0,
161 : id);
162 15 : goto check_established;
163 : }
164 :
165 54 : switch (data->state) {
166 : case START:
167 19 : return eap_tls_build_start(sm, data, id);
168 : case CONTINUE:
169 35 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn))
170 16 : data->established = 1;
171 35 : break;
172 : default:
173 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: %s - unexpected state %d",
174 0 : __func__, data->state);
175 0 : return NULL;
176 : }
177 :
178 35 : res = eap_server_tls_build_msg(&data->ssl, data->eap_type, 0, id);
179 :
180 : check_established:
181 50 : if (data->established && data->ssl.state != WAIT_FRAG_ACK) {
182 : /* TLS handshake has been completed and there are no more
183 : * fragments waiting to be sent out. */
184 16 : wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
185 16 : eap_tls_state(data, SUCCESS);
186 : }
187 :
188 50 : return res;
189 : }
190 :
191 :
192 81 : static Boolean eap_tls_check(struct eap_sm *sm, void *priv,
193 : struct wpabuf *respData)
194 : {
195 81 : struct eap_tls_data *data = priv;
196 : const u8 *pos;
197 : size_t len;
198 :
199 81 : if (data->eap_type == EAP_UNAUTH_TLS_TYPE)
200 8 : pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
201 : EAP_VENDOR_TYPE_UNAUTH_TLS, respData,
202 : &len);
203 73 : else if (data->eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
204 8 : pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
205 : EAP_VENDOR_WFA_UNAUTH_TLS, respData,
206 : &len);
207 : else
208 65 : pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_type,
209 : respData, &len);
210 81 : if (pos == NULL || len < 1) {
211 0 : wpa_printf(MSG_INFO, "EAP-TLS: Invalid frame");
212 0 : return TRUE;
213 : }
214 :
215 81 : return FALSE;
216 : }
217 :
218 :
219 54 : static void eap_tls_process_msg(struct eap_sm *sm, void *priv,
220 : const struct wpabuf *respData)
221 : {
222 54 : struct eap_tls_data *data = priv;
223 54 : if (data->state == SUCCESS && wpabuf_len(data->ssl.tls_in) == 0) {
224 16 : wpa_printf(MSG_DEBUG, "EAP-TLS: Client acknowledged final TLS "
225 : "handshake message");
226 70 : return;
227 : }
228 38 : if (eap_server_tls_phase1(sm, &data->ssl) < 0)
229 3 : eap_tls_state(data, FAILURE);
230 : }
231 :
232 :
233 81 : static void eap_tls_process(struct eap_sm *sm, void *priv,
234 : struct wpabuf *respData)
235 : {
236 81 : struct eap_tls_data *data = priv;
237 81 : if (eap_server_tls_process(sm, &data->ssl, respData, data,
238 81 : data->eap_type, NULL, eap_tls_process_msg) <
239 : 0)
240 0 : eap_tls_state(data, FAILURE);
241 81 : }
242 :
243 :
244 84 : static Boolean eap_tls_isDone(struct eap_sm *sm, void *priv)
245 : {
246 84 : struct eap_tls_data *data = priv;
247 84 : return data->state == SUCCESS || data->state == FAILURE;
248 : }
249 :
250 :
251 19 : static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
252 : {
253 19 : struct eap_tls_data *data = priv;
254 : u8 *eapKeyData;
255 :
256 19 : if (data->state != SUCCESS)
257 3 : return NULL;
258 :
259 16 : eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
260 : "client EAP encryption",
261 : EAP_TLS_KEY_LEN);
262 16 : if (eapKeyData) {
263 16 : *len = EAP_TLS_KEY_LEN;
264 16 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived key",
265 : eapKeyData, EAP_TLS_KEY_LEN);
266 : } else {
267 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive key");
268 : }
269 :
270 16 : return eapKeyData;
271 : }
272 :
273 :
274 0 : static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
275 : {
276 0 : struct eap_tls_data *data = priv;
277 : u8 *eapKeyData, *emsk;
278 :
279 0 : if (data->state != SUCCESS)
280 0 : return NULL;
281 :
282 0 : eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
283 : "client EAP encryption",
284 : EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
285 0 : if (eapKeyData) {
286 0 : emsk = os_malloc(EAP_EMSK_LEN);
287 0 : if (emsk)
288 0 : os_memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
289 : EAP_EMSK_LEN);
290 0 : os_free(eapKeyData);
291 : } else
292 0 : emsk = NULL;
293 :
294 0 : if (emsk) {
295 0 : *len = EAP_EMSK_LEN;
296 0 : wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived EMSK",
297 : emsk, EAP_EMSK_LEN);
298 : } else {
299 0 : wpa_printf(MSG_DEBUG, "EAP-TLS: Failed to derive EMSK");
300 : }
301 :
302 0 : return emsk;
303 : }
304 :
305 :
306 22 : static Boolean eap_tls_isSuccess(struct eap_sm *sm, void *priv)
307 : {
308 22 : struct eap_tls_data *data = priv;
309 22 : return data->state == SUCCESS;
310 : }
311 :
312 :
313 2 : int eap_server_tls_register(void)
314 : {
315 : struct eap_method *eap;
316 : int ret;
317 :
318 2 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
319 : EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
320 2 : if (eap == NULL)
321 0 : return -1;
322 :
323 2 : eap->init = eap_tls_init;
324 2 : eap->reset = eap_tls_reset;
325 2 : eap->buildReq = eap_tls_buildReq;
326 2 : eap->check = eap_tls_check;
327 2 : eap->process = eap_tls_process;
328 2 : eap->isDone = eap_tls_isDone;
329 2 : eap->getKey = eap_tls_getKey;
330 2 : eap->isSuccess = eap_tls_isSuccess;
331 2 : eap->get_emsk = eap_tls_get_emsk;
332 :
333 2 : ret = eap_server_method_register(eap);
334 2 : if (ret)
335 0 : eap_server_method_free(eap);
336 2 : return ret;
337 : }
338 :
339 :
340 : #ifdef EAP_SERVER_UNAUTH_TLS
341 2 : int eap_server_unauth_tls_register(void)
342 : {
343 : struct eap_method *eap;
344 : int ret;
345 :
346 2 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
347 : EAP_VENDOR_UNAUTH_TLS,
348 : EAP_VENDOR_TYPE_UNAUTH_TLS,
349 : "UNAUTH-TLS");
350 2 : if (eap == NULL)
351 0 : return -1;
352 :
353 2 : eap->init = eap_unauth_tls_init;
354 2 : eap->reset = eap_tls_reset;
355 2 : eap->buildReq = eap_tls_buildReq;
356 2 : eap->check = eap_tls_check;
357 2 : eap->process = eap_tls_process;
358 2 : eap->isDone = eap_tls_isDone;
359 2 : eap->getKey = eap_tls_getKey;
360 2 : eap->isSuccess = eap_tls_isSuccess;
361 2 : eap->get_emsk = eap_tls_get_emsk;
362 :
363 2 : ret = eap_server_method_register(eap);
364 2 : if (ret)
365 0 : eap_server_method_free(eap);
366 2 : return ret;
367 : }
368 : #endif /* EAP_SERVER_UNAUTH_TLS */
369 :
370 :
371 : #ifdef CONFIG_HS20
372 2 : int eap_server_wfa_unauth_tls_register(void)
373 : {
374 : struct eap_method *eap;
375 : int ret;
376 :
377 2 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
378 : EAP_VENDOR_WFA_NEW,
379 : EAP_VENDOR_WFA_UNAUTH_TLS,
380 : "WFA-UNAUTH-TLS");
381 2 : if (eap == NULL)
382 0 : return -1;
383 :
384 2 : eap->init = eap_wfa_unauth_tls_init;
385 2 : eap->reset = eap_tls_reset;
386 2 : eap->buildReq = eap_tls_buildReq;
387 2 : eap->check = eap_tls_check;
388 2 : eap->process = eap_tls_process;
389 2 : eap->isDone = eap_tls_isDone;
390 2 : eap->getKey = eap_tls_getKey;
391 2 : eap->isSuccess = eap_tls_isSuccess;
392 2 : eap->get_emsk = eap_tls_get_emsk;
393 :
394 2 : ret = eap_server_method_register(eap);
395 2 : if (ret)
396 0 : eap_server_method_free(eap);
397 2 : return ret;
398 : }
399 : #endif /* CONFIG_HS20 */
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