1 /*
2 * EAP peer method: EAP-TTLS (RFC 5281)
3 * Copyright (c) 2004-2015, 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/ms_funcs.h"
13 #include "crypto/sha1.h"
14 #include "crypto/tls.h"
15 #include "eap_common/chap.h"
16 #include "eap_common/eap_ttls.h"
17 #include "mschapv2.h"
18 #include "eap_i.h"
19 #include "eap_tls_common.h"
20 #include "eap_config.h"
21
22
23 #define EAP_TTLS_VERSION 0
24
25
26 static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
27
28
29 struct eap_ttls_data {
30 struct eap_ssl_data ssl;
31
32 int ttls_version;
33
34 const struct eap_method *phase2_method;
35 void *phase2_priv;
36 int phase2_success;
37 int phase2_start;
38 EapDecision decision_succ;
39
40 enum phase2_types {
41 EAP_TTLS_PHASE2_EAP,
42 EAP_TTLS_PHASE2_MSCHAPV2,
43 EAP_TTLS_PHASE2_MSCHAP,
44 EAP_TTLS_PHASE2_PAP,
45 EAP_TTLS_PHASE2_CHAP
46 } phase2_type;
47 struct eap_method_type phase2_eap_type;
48 struct eap_method_type *phase2_eap_types;
49 size_t num_phase2_eap_types;
50
51 u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN];
52 int auth_response_valid;
53 u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */
54 u8 ident;
55 int resuming; /* starting a resumed session */
56 int reauth; /* reauthentication */
57 u8 *key_data;
58 u8 *session_id;
59 size_t id_len;
60
61 struct wpabuf *pending_phase2_req;
62 struct wpabuf *pending_resp;
63
64 #ifdef EAP_TNC
65 int ready_for_tnc;
66 int tnc_started;
67 #endif /* EAP_TNC */
68 };
69
70
eap_ttls_init(struct eap_sm * sm)71 static void * eap_ttls_init(struct eap_sm *sm)
72 {
73 struct eap_ttls_data *data;
74 struct eap_peer_config *config = eap_get_config(sm);
75 int selected_non_eap;
76 char *selected;
77
78 data = os_zalloc(sizeof(*data));
79 if (data == NULL)
80 return NULL;
81 data->ttls_version = EAP_TTLS_VERSION;
82 selected = "EAP";
83 selected_non_eap = 0;
84 data->phase2_type = EAP_TTLS_PHASE2_EAP;
85
86 /*
87 * Either one auth= type or one or more autheap= methods can be
88 * specified.
89 */
90 if (config && config->phase2) {
91 const char *token, *last = NULL;
92
93 while ((token = cstr_token(config->phase2, " \t", &last))) {
94 if (os_strncmp(token, "auth=", 5) != 0)
95 continue;
96 token += 5;
97
98 if (last - token == 8 &&
99 os_strncmp(token, "MSCHAPV2", 8) == 0) {
100 selected = "MSCHAPV2";
101 data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
102 } else if (last - token == 6 &&
103 os_strncmp(token, "MSCHAP", 6) == 0) {
104 selected = "MSCHAP";
105 data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
106 } else if (last - token == 3 &&
107 os_strncmp(token, "PAP", 3) == 0) {
108 selected = "PAP";
109 data->phase2_type = EAP_TTLS_PHASE2_PAP;
110 } else if (last - token == 4 &&
111 os_strncmp(token, "CHAP", 4) == 0) {
112 selected = "CHAP";
113 data->phase2_type = EAP_TTLS_PHASE2_CHAP;
114 } else {
115 wpa_printf(MSG_ERROR,
116 "EAP-TTLS: Unsupported Phase2 type '%s'",
117 token);
118 eap_ttls_deinit(sm, data);
119 return NULL;
120 }
121
122 if (selected_non_eap) {
123 wpa_printf(MSG_ERROR,
124 "EAP-TTLS: Only one Phase2 type can be specified");
125 eap_ttls_deinit(sm, data);
126 return NULL;
127 }
128
129 selected_non_eap = 1;
130 }
131
132 if (os_strstr(config->phase2, "autheap=")) {
133 if (selected_non_eap) {
134 wpa_printf(MSG_ERROR,
135 "EAP-TTLS: Both auth= and autheap= params cannot be specified");
136 eap_ttls_deinit(sm, data);
137 return NULL;
138 }
139 selected = "EAP";
140 data->phase2_type = EAP_TTLS_PHASE2_EAP;
141 }
142 }
143
144 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
145
146 if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
147 if (eap_peer_select_phase2_methods(config, "autheap=",
148 &data->phase2_eap_types,
149 &data->num_phase2_eap_types)
150 < 0) {
151 eap_ttls_deinit(sm, data);
152 return NULL;
153 }
154
155 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
156 data->phase2_eap_type.method = EAP_TYPE_NONE;
157 }
158
159 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TTLS)) {
160 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
161 eap_ttls_deinit(sm, data);
162 return NULL;
163 }
164
165 return data;
166 }
167
168
eap_ttls_phase2_eap_deinit(struct eap_sm * sm,struct eap_ttls_data * data)169 static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm,
170 struct eap_ttls_data *data)
171 {
172 if (data->phase2_priv && data->phase2_method) {
173 data->phase2_method->deinit(sm, data->phase2_priv);
174 data->phase2_method = NULL;
175 data->phase2_priv = NULL;
176 }
177 }
178
179
eap_ttls_free_key(struct eap_ttls_data * data)180 static void eap_ttls_free_key(struct eap_ttls_data *data)
181 {
182 if (data->key_data) {
183 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
184 data->key_data = NULL;
185 }
186 }
187
188
eap_ttls_deinit(struct eap_sm * sm,void * priv)189 static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
190 {
191 struct eap_ttls_data *data = priv;
192 if (data == NULL)
193 return;
194 eap_ttls_phase2_eap_deinit(sm, data);
195 os_free(data->phase2_eap_types);
196 eap_peer_tls_ssl_deinit(sm, &data->ssl);
197 eap_ttls_free_key(data);
198 os_free(data->session_id);
199 wpabuf_clear_free(data->pending_phase2_req);
200 wpabuf_clear_free(data->pending_resp);
201 os_free(data);
202 }
203
204
eap_ttls_avp_hdr(u8 * avphdr,u32 avp_code,u32 vendor_id,int mandatory,size_t len)205 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
206 int mandatory, size_t len)
207 {
208 struct ttls_avp_vendor *avp;
209 u8 flags;
210 size_t hdrlen;
211
212 avp = (struct ttls_avp_vendor *) avphdr;
213 flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
214 if (vendor_id) {
215 flags |= AVP_FLAGS_VENDOR;
216 hdrlen = sizeof(*avp);
217 avp->vendor_id = host_to_be32(vendor_id);
218 } else {
219 hdrlen = sizeof(struct ttls_avp);
220 }
221
222 avp->avp_code = host_to_be32(avp_code);
223 avp->avp_length = host_to_be32(((u32) flags << 24) |
224 (u32) (hdrlen + len));
225
226 return avphdr + hdrlen;
227 }
228
229
eap_ttls_avp_add(u8 * start,u8 * avphdr,u32 avp_code,u32 vendor_id,int mandatory,const u8 * data,size_t len)230 static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
231 u32 vendor_id, int mandatory,
232 const u8 *data, size_t len)
233 {
234 u8 *pos;
235 pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
236 os_memcpy(pos, data, len);
237 pos += len;
238 AVP_PAD(start, pos);
239 return pos;
240 }
241
242
eap_ttls_avp_encapsulate(struct wpabuf ** resp,u32 avp_code,int mandatory)243 static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code,
244 int mandatory)
245 {
246 struct wpabuf *msg;
247 u8 *avp, *pos;
248
249 msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4);
250 if (msg == NULL) {
251 wpabuf_clear_free(*resp);
252 *resp = NULL;
253 return -1;
254 }
255
256 avp = wpabuf_mhead(msg);
257 pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp));
258 os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp));
259 pos += wpabuf_len(*resp);
260 AVP_PAD(avp, pos);
261 wpabuf_clear_free(*resp);
262 wpabuf_put(msg, pos - avp);
263 *resp = msg;
264 return 0;
265 }
266
267
eap_ttls_v0_derive_key(struct eap_sm * sm,struct eap_ttls_data * data)268 static int eap_ttls_v0_derive_key(struct eap_sm *sm,
269 struct eap_ttls_data *data)
270 {
271 eap_ttls_free_key(data);
272 data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
273 "ttls keying material",
274 NULL, 0,
275 EAP_TLS_KEY_LEN +
276 EAP_EMSK_LEN);
277 if (!data->key_data) {
278 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
279 return -1;
280 }
281
282 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
283 data->key_data, EAP_TLS_KEY_LEN);
284 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived EMSK",
285 data->key_data + EAP_TLS_KEY_LEN,
286 EAP_EMSK_LEN);
287
288 os_free(data->session_id);
289 data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
290 EAP_TYPE_TTLS,
291 &data->id_len);
292 if (data->session_id) {
293 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived Session-Id",
294 data->session_id, data->id_len);
295 } else {
296 wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive Session-Id");
297 }
298
299 return 0;
300 }
301
302
303 #ifndef CONFIG_FIPS
eap_ttls_implicit_challenge(struct eap_sm * sm,struct eap_ttls_data * data,size_t len)304 static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
305 struct eap_ttls_data *data, size_t len)
306 {
307 return eap_peer_tls_derive_key(sm, &data->ssl, "ttls challenge",
308 NULL, 0, len);
309 }
310 #endif /* CONFIG_FIPS */
311
312
eap_ttls_phase2_select_eap_method(struct eap_ttls_data * data,u8 method)313 static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data,
314 u8 method)
315 {
316 size_t i;
317 for (i = 0; i < data->num_phase2_eap_types; i++) {
318 if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF ||
319 data->phase2_eap_types[i].method != method)
320 continue;
321
322 data->phase2_eap_type.vendor =
323 data->phase2_eap_types[i].vendor;
324 data->phase2_eap_type.method =
325 data->phase2_eap_types[i].method;
326 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
327 "Phase 2 EAP vendor %d method %d",
328 data->phase2_eap_type.vendor,
329 data->phase2_eap_type.method);
330 break;
331 }
332 }
333
334
eap_ttls_phase2_eap_process(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct eap_hdr * hdr,size_t len,struct wpabuf ** resp)335 static int eap_ttls_phase2_eap_process(struct eap_sm *sm,
336 struct eap_ttls_data *data,
337 struct eap_method_ret *ret,
338 struct eap_hdr *hdr, size_t len,
339 struct wpabuf **resp)
340 {
341 struct wpabuf msg;
342 struct eap_method_ret iret;
343
344 os_memset(&iret, 0, sizeof(iret));
345 wpabuf_set(&msg, hdr, len);
346 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
347 &msg);
348 if ((iret.methodState == METHOD_DONE ||
349 iret.methodState == METHOD_MAY_CONT) &&
350 (iret.decision == DECISION_UNCOND_SUCC ||
351 iret.decision == DECISION_COND_SUCC ||
352 iret.decision == DECISION_FAIL)) {
353 ret->methodState = iret.methodState;
354 ret->decision = iret.decision;
355 }
356
357 return 0;
358 }
359
360
eap_ttls_phase2_request_eap_method(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct eap_hdr * hdr,size_t len,u8 method,struct wpabuf ** resp)361 static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm,
362 struct eap_ttls_data *data,
363 struct eap_method_ret *ret,
364 struct eap_hdr *hdr, size_t len,
365 u8 method, struct wpabuf **resp)
366 {
367 #ifdef EAP_TNC
368 if (data->tnc_started && data->phase2_method &&
369 data->phase2_priv && method == EAP_TYPE_TNC &&
370 data->phase2_eap_type.method == EAP_TYPE_TNC)
371 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len,
372 resp);
373
374 if (data->ready_for_tnc && !data->tnc_started &&
375 method == EAP_TYPE_TNC) {
376 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
377 "EAP method");
378 data->tnc_started = 1;
379 }
380
381 if (data->tnc_started) {
382 if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF ||
383 data->phase2_eap_type.method == EAP_TYPE_TNC) {
384 wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP "
385 "type %d for TNC", method);
386 return -1;
387 }
388
389 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
390 data->phase2_eap_type.method = method;
391 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
392 "Phase 2 EAP vendor %d method %d (TNC)",
393 data->phase2_eap_type.vendor,
394 data->phase2_eap_type.method);
395
396 if (data->phase2_type == EAP_TTLS_PHASE2_EAP)
397 eap_ttls_phase2_eap_deinit(sm, data);
398 }
399 #endif /* EAP_TNC */
400
401 if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
402 data->phase2_eap_type.method == EAP_TYPE_NONE)
403 eap_ttls_phase2_select_eap_method(data, method);
404
405 if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE)
406 {
407 if (eap_peer_tls_phase2_nak(data->phase2_eap_types,
408 data->num_phase2_eap_types,
409 hdr, resp))
410 return -1;
411 return 0;
412 }
413
414 if (data->phase2_priv == NULL) {
415 data->phase2_method = eap_peer_get_eap_method(
416 EAP_VENDOR_IETF, method);
417 if (data->phase2_method) {
418 sm->init_phase2 = 1;
419 data->phase2_priv = data->phase2_method->init(sm);
420 sm->init_phase2 = 0;
421 }
422 }
423 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
424 wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
425 "Phase 2 EAP method %d", method);
426 return -1;
427 }
428
429 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp);
430 }
431
432
eap_ttls_phase2_request_eap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct eap_hdr * hdr,struct wpabuf ** resp)433 static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
434 struct eap_ttls_data *data,
435 struct eap_method_ret *ret,
436 struct eap_hdr *hdr,
437 struct wpabuf **resp)
438 {
439 size_t len = be_to_host16(hdr->length);
440 u8 *pos;
441 struct eap_peer_config *config = eap_get_config(sm);
442
443 if (len <= sizeof(struct eap_hdr)) {
444 wpa_printf(MSG_INFO, "EAP-TTLS: too short "
445 "Phase 2 request (len=%lu)", (unsigned long) len);
446 return -1;
447 }
448 pos = (u8 *) (hdr + 1);
449 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
450 switch (*pos) {
451 case EAP_TYPE_IDENTITY:
452 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
453 break;
454 default:
455 if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len,
456 *pos, resp) < 0)
457 return -1;
458 break;
459 }
460
461 if (*resp == NULL &&
462 (config->pending_req_identity || config->pending_req_password ||
463 config->pending_req_otp || config->pending_req_sim)) {
464 return 0;
465 }
466
467 if (*resp == NULL)
468 return -1;
469
470 wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
471 *resp);
472 return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1);
473 }
474
475
eap_ttls_phase2_request_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)476 static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
477 struct eap_ttls_data *data,
478 struct eap_method_ret *ret,
479 struct wpabuf **resp)
480 {
481 #ifdef CONFIG_FIPS
482 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPV2 not supported in FIPS build");
483 return -1;
484 #else /* CONFIG_FIPS */
485 #ifdef EAP_MSCHAPv2
486 struct wpabuf *msg;
487 u8 *buf, *pos, *challenge, *peer_challenge;
488 const u8 *identity, *password;
489 size_t identity_len, password_len;
490 int pwhash;
491
492 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
493
494 identity = eap_get_config_identity(sm, &identity_len);
495 password = eap_get_config_password2(sm, &password_len, &pwhash);
496 if (identity == NULL || password == NULL)
497 return -1;
498
499 msg = wpabuf_alloc(identity_len + 1000);
500 if (msg == NULL) {
501 wpa_printf(MSG_ERROR,
502 "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
503 return -1;
504 }
505 pos = buf = wpabuf_mhead(msg);
506
507 /* User-Name */
508 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
509 identity, identity_len);
510
511 /* MS-CHAP-Challenge */
512 challenge = eap_ttls_implicit_challenge(
513 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
514 if (challenge == NULL) {
515 wpabuf_clear_free(msg);
516 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
517 "implicit challenge");
518 return -1;
519 }
520
521 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
522 RADIUS_VENDOR_ID_MICROSOFT, 1,
523 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
524
525 /* MS-CHAP2-Response */
526 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
527 RADIUS_VENDOR_ID_MICROSOFT, 1,
528 EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
529 data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
530 *pos++ = data->ident;
531 *pos++ = 0; /* Flags */
532 if (os_get_random(pos, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN) < 0) {
533 os_free(challenge);
534 wpabuf_clear_free(msg);
535 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to get "
536 "random data for peer challenge");
537 return -1;
538 }
539 peer_challenge = pos;
540 pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
541 os_memset(pos, 0, 8); /* Reserved, must be zero */
542 pos += 8;
543 if (mschapv2_derive_response(identity, identity_len, password,
544 password_len, pwhash, challenge,
545 peer_challenge, pos, data->auth_response,
546 data->master_key)) {
547 os_free(challenge);
548 wpabuf_clear_free(msg);
549 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
550 "response");
551 return -1;
552 }
553 data->auth_response_valid = 1;
554
555 pos += 24;
556 os_free(challenge);
557 AVP_PAD(buf, pos);
558
559 wpabuf_put(msg, pos - buf);
560 *resp = msg;
561
562 return 0;
563 #else /* EAP_MSCHAPv2 */
564 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
565 return -1;
566 #endif /* EAP_MSCHAPv2 */
567 #endif /* CONFIG_FIPS */
568 }
569
570
eap_ttls_phase2_request_mschap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)571 static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
572 struct eap_ttls_data *data,
573 struct eap_method_ret *ret,
574 struct wpabuf **resp)
575 {
576 #ifdef CONFIG_FIPS
577 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAP not supported in FIPS build");
578 return -1;
579 #else /* CONFIG_FIPS */
580 struct wpabuf *msg;
581 u8 *buf, *pos, *challenge;
582 const u8 *identity, *password;
583 size_t identity_len, password_len;
584 int pwhash;
585
586 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
587
588 identity = eap_get_config_identity(sm, &identity_len);
589 password = eap_get_config_password2(sm, &password_len, &pwhash);
590 if (identity == NULL || password == NULL)
591 return -1;
592
593 msg = wpabuf_alloc(identity_len + 1000);
594 if (msg == NULL) {
595 wpa_printf(MSG_ERROR,
596 "EAP-TTLS/MSCHAP: Failed to allocate memory");
597 return -1;
598 }
599 pos = buf = wpabuf_mhead(msg);
600
601 /* User-Name */
602 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
603 identity, identity_len);
604
605 /* MS-CHAP-Challenge */
606 challenge = eap_ttls_implicit_challenge(
607 sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
608 if (challenge == NULL) {
609 wpabuf_clear_free(msg);
610 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
611 "implicit challenge");
612 return -1;
613 }
614
615 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
616 RADIUS_VENDOR_ID_MICROSOFT, 1,
617 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
618
619 /* MS-CHAP-Response */
620 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
621 RADIUS_VENDOR_ID_MICROSOFT, 1,
622 EAP_TTLS_MSCHAP_RESPONSE_LEN);
623 data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
624 *pos++ = data->ident;
625 *pos++ = 1; /* Flags: Use NT style passwords */
626 os_memset(pos, 0, 24); /* LM-Response */
627 pos += 24;
628 if (pwhash) {
629 /* NT-Response */
630 if (challenge_response(challenge, password, pos)) {
631 wpa_printf(MSG_ERROR,
632 "EAP-TTLS/MSCHAP: Failed derive password hash");
633 wpabuf_clear_free(msg);
634 os_free(challenge);
635 return -1;
636 }
637
638 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
639 password, 16);
640 } else {
641 /* NT-Response */
642 if (nt_challenge_response(challenge, password, password_len,
643 pos)) {
644 wpa_printf(MSG_ERROR,
645 "EAP-TTLS/MSCHAP: Failed derive password");
646 wpabuf_clear_free(msg);
647 os_free(challenge);
648 return -1;
649 }
650
651 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
652 password, password_len);
653 }
654 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
655 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
656 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
657 pos += 24;
658 os_free(challenge);
659 AVP_PAD(buf, pos);
660
661 wpabuf_put(msg, pos - buf);
662 *resp = msg;
663
664 /* EAP-TTLS/MSCHAP does not provide tunneled success
665 * notification, so assume that Phase2 succeeds. */
666 ret->methodState = METHOD_DONE;
667 ret->decision = DECISION_COND_SUCC;
668
669 return 0;
670 #endif /* CONFIG_FIPS */
671 }
672
673
eap_ttls_phase2_request_pap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)674 static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
675 struct eap_ttls_data *data,
676 struct eap_method_ret *ret,
677 struct wpabuf **resp)
678 {
679 struct wpabuf *msg;
680 u8 *buf, *pos;
681 size_t pad;
682 const u8 *identity, *password;
683 size_t identity_len, password_len;
684
685 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
686
687 identity = eap_get_config_identity(sm, &identity_len);
688 password = eap_get_config_password(sm, &password_len);
689 if (identity == NULL || password == NULL)
690 return -1;
691
692 msg = wpabuf_alloc(identity_len + password_len + 100);
693 if (msg == NULL) {
694 wpa_printf(MSG_ERROR,
695 "EAP-TTLS/PAP: Failed to allocate memory");
696 return -1;
697 }
698 pos = buf = wpabuf_mhead(msg);
699
700 /* User-Name */
701 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
702 identity, identity_len);
703
704 /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
705 * the data, so no separate encryption is used in the AVP itself.
706 * However, the password is padded to obfuscate its length. */
707 pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15;
708 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
709 password_len + pad);
710 os_memcpy(pos, password, password_len);
711 pos += password_len;
712 os_memset(pos, 0, pad);
713 pos += pad;
714 AVP_PAD(buf, pos);
715
716 wpabuf_put(msg, pos - buf);
717 *resp = msg;
718
719 /* EAP-TTLS/PAP does not provide tunneled success notification,
720 * so assume that Phase2 succeeds. */
721 ret->methodState = METHOD_DONE;
722 ret->decision = DECISION_COND_SUCC;
723
724 return 0;
725 }
726
727
eap_ttls_phase2_request_chap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)728 static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
729 struct eap_ttls_data *data,
730 struct eap_method_ret *ret,
731 struct wpabuf **resp)
732 {
733 #ifdef CONFIG_FIPS
734 wpa_printf(MSG_ERROR, "EAP-TTLS: CHAP not supported in FIPS build");
735 return -1;
736 #else /* CONFIG_FIPS */
737 struct wpabuf *msg;
738 u8 *buf, *pos, *challenge;
739 const u8 *identity, *password;
740 size_t identity_len, password_len;
741
742 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
743
744 identity = eap_get_config_identity(sm, &identity_len);
745 password = eap_get_config_password(sm, &password_len);
746 if (identity == NULL || password == NULL)
747 return -1;
748
749 msg = wpabuf_alloc(identity_len + 1000);
750 if (msg == NULL) {
751 wpa_printf(MSG_ERROR,
752 "EAP-TTLS/CHAP: Failed to allocate memory");
753 return -1;
754 }
755 pos = buf = wpabuf_mhead(msg);
756
757 /* User-Name */
758 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
759 identity, identity_len);
760
761 /* CHAP-Challenge */
762 challenge = eap_ttls_implicit_challenge(
763 sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
764 if (challenge == NULL) {
765 wpabuf_clear_free(msg);
766 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
767 "implicit challenge");
768 return -1;
769 }
770
771 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
772 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
773
774 /* CHAP-Password */
775 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
776 1 + EAP_TTLS_CHAP_PASSWORD_LEN);
777 data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
778 *pos++ = data->ident;
779
780 /* MD5(Ident + Password + Challenge) */
781 chap_md5(data->ident, password, password_len, challenge,
782 EAP_TTLS_CHAP_CHALLENGE_LEN, pos);
783
784 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
785 identity, identity_len);
786 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
787 password, password_len);
788 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
789 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
790 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
791 pos, EAP_TTLS_CHAP_PASSWORD_LEN);
792 pos += EAP_TTLS_CHAP_PASSWORD_LEN;
793 os_free(challenge);
794 AVP_PAD(buf, pos);
795
796 wpabuf_put(msg, pos - buf);
797 *resp = msg;
798
799 /* EAP-TTLS/CHAP does not provide tunneled success
800 * notification, so assume that Phase2 succeeds. */
801 ret->methodState = METHOD_DONE;
802 ret->decision = DECISION_COND_SUCC;
803
804 return 0;
805 #endif /* CONFIG_FIPS */
806 }
807
808
eap_ttls_phase2_request(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct eap_hdr * hdr,struct wpabuf ** resp)809 static int eap_ttls_phase2_request(struct eap_sm *sm,
810 struct eap_ttls_data *data,
811 struct eap_method_ret *ret,
812 struct eap_hdr *hdr,
813 struct wpabuf **resp)
814 {
815 int res = 0;
816 size_t len;
817 enum phase2_types phase2_type = data->phase2_type;
818
819 #ifdef EAP_TNC
820 if (data->tnc_started) {
821 wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC");
822 phase2_type = EAP_TTLS_PHASE2_EAP;
823 }
824 #endif /* EAP_TNC */
825
826 if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
827 phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
828 phase2_type == EAP_TTLS_PHASE2_PAP ||
829 phase2_type == EAP_TTLS_PHASE2_CHAP) {
830 if (eap_get_config_identity(sm, &len) == NULL) {
831 wpa_printf(MSG_INFO,
832 "EAP-TTLS: Identity not configured");
833 eap_sm_request_identity(sm);
834 if (eap_get_config_password(sm, &len) == NULL)
835 eap_sm_request_password(sm);
836 return 0;
837 }
838
839 if (eap_get_config_password(sm, &len) == NULL) {
840 wpa_printf(MSG_INFO,
841 "EAP-TTLS: Password not configured");
842 eap_sm_request_password(sm);
843 return 0;
844 }
845 }
846
847 switch (phase2_type) {
848 case EAP_TTLS_PHASE2_EAP:
849 res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp);
850 break;
851 case EAP_TTLS_PHASE2_MSCHAPV2:
852 res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp);
853 break;
854 case EAP_TTLS_PHASE2_MSCHAP:
855 res = eap_ttls_phase2_request_mschap(sm, data, ret, resp);
856 break;
857 case EAP_TTLS_PHASE2_PAP:
858 res = eap_ttls_phase2_request_pap(sm, data, ret, resp);
859 break;
860 case EAP_TTLS_PHASE2_CHAP:
861 res = eap_ttls_phase2_request_chap(sm, data, ret, resp);
862 break;
863 default:
864 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
865 res = -1;
866 break;
867 }
868
869 if (res < 0) {
870 ret->methodState = METHOD_DONE;
871 ret->decision = DECISION_FAIL;
872 }
873
874 return res;
875 }
876
877
878 struct ttls_parse_avp {
879 u8 *mschapv2;
880 u8 *eapdata;
881 size_t eap_len;
882 int mschapv2_error;
883 };
884
885
eap_ttls_parse_attr_eap(const u8 * dpos,size_t dlen,struct ttls_parse_avp * parse)886 static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen,
887 struct ttls_parse_avp *parse)
888 {
889 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
890 if (parse->eapdata == NULL) {
891 parse->eapdata = os_memdup(dpos, dlen);
892 if (parse->eapdata == NULL) {
893 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
894 "memory for Phase 2 EAP data");
895 return -1;
896 }
897 parse->eap_len = dlen;
898 } else {
899 u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen);
900 if (neweap == NULL) {
901 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
902 "memory for Phase 2 EAP data");
903 return -1;
904 }
905 os_memcpy(neweap + parse->eap_len, dpos, dlen);
906 parse->eapdata = neweap;
907 parse->eap_len += dlen;
908 }
909
910 return 0;
911 }
912
913
eap_ttls_parse_avp(u8 * pos,size_t left,struct ttls_parse_avp * parse)914 static int eap_ttls_parse_avp(u8 *pos, size_t left,
915 struct ttls_parse_avp *parse)
916 {
917 struct ttls_avp *avp;
918 u32 avp_code, avp_length, vendor_id = 0;
919 u8 avp_flags, *dpos;
920 size_t dlen;
921
922 avp = (struct ttls_avp *) pos;
923 avp_code = be_to_host32(avp->avp_code);
924 avp_length = be_to_host32(avp->avp_length);
925 avp_flags = (avp_length >> 24) & 0xff;
926 avp_length &= 0xffffff;
927 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
928 "length=%d", (int) avp_code, avp_flags,
929 (int) avp_length);
930
931 if (avp_length > left) {
932 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
933 "(len=%d, left=%lu) - dropped",
934 (int) avp_length, (unsigned long) left);
935 return -1;
936 }
937
938 if (avp_length < sizeof(*avp)) {
939 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d",
940 avp_length);
941 return -1;
942 }
943
944 dpos = (u8 *) (avp + 1);
945 dlen = avp_length - sizeof(*avp);
946 if (avp_flags & AVP_FLAGS_VENDOR) {
947 if (dlen < 4) {
948 wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP "
949 "underflow");
950 return -1;
951 }
952 vendor_id = WPA_GET_BE32(dpos);
953 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
954 (int) vendor_id);
955 dpos += 4;
956 dlen -= 4;
957 }
958
959 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
960
961 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
962 if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0)
963 return -1;
964 } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
965 /* This is an optional message that can be displayed to
966 * the user. */
967 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message",
968 dpos, dlen);
969 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
970 avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
971 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success",
972 dpos, dlen);
973 if (dlen != 43) {
974 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
975 "MS-CHAP2-Success length "
976 "(len=%lu, expected 43)",
977 (unsigned long) dlen);
978 return -1;
979 }
980 parse->mschapv2 = dpos;
981 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
982 avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
983 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error",
984 dpos, dlen);
985 parse->mschapv2_error = 1;
986 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
987 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP "
988 "code %d vendor_id %d - dropped",
989 (int) avp_code, (int) vendor_id);
990 return -1;
991 } else {
992 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP "
993 "code %d vendor_id %d",
994 (int) avp_code, (int) vendor_id);
995 }
996
997 return avp_length;
998 }
999
1000
eap_ttls_parse_avps(struct wpabuf * in_decrypted,struct ttls_parse_avp * parse)1001 static int eap_ttls_parse_avps(struct wpabuf *in_decrypted,
1002 struct ttls_parse_avp *parse)
1003 {
1004 u8 *pos;
1005 size_t left, pad;
1006 int avp_length;
1007
1008 pos = wpabuf_mhead(in_decrypted);
1009 left = wpabuf_len(in_decrypted);
1010 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left);
1011 if (left < sizeof(struct ttls_avp)) {
1012 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
1013 " len=%lu expected %lu or more - dropped",
1014 (unsigned long) left,
1015 (unsigned long) sizeof(struct ttls_avp));
1016 return -1;
1017 }
1018
1019 /* Parse AVPs */
1020 os_memset(parse, 0, sizeof(*parse));
1021
1022 while (left > 0) {
1023 avp_length = eap_ttls_parse_avp(pos, left, parse);
1024 if (avp_length < 0)
1025 return -1;
1026
1027 pad = (4 - (avp_length & 3)) & 3;
1028 pos += avp_length + pad;
1029 if (left < avp_length + pad)
1030 left = 0;
1031 else
1032 left -= avp_length + pad;
1033 }
1034
1035 return 0;
1036 }
1037
1038
eap_ttls_fake_identity_request(void)1039 static u8 * eap_ttls_fake_identity_request(void)
1040 {
1041 struct eap_hdr *hdr;
1042 u8 *buf;
1043
1044 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
1045 "Phase 2 - use fake EAP-Request Identity");
1046 buf = os_malloc(sizeof(*hdr) + 1);
1047 if (buf == NULL) {
1048 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
1049 "memory for fake EAP-Identity Request");
1050 return NULL;
1051 }
1052
1053 hdr = (struct eap_hdr *) buf;
1054 hdr->code = EAP_CODE_REQUEST;
1055 hdr->identifier = 0;
1056 hdr->length = host_to_be16(sizeof(*hdr) + 1);
1057 buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
1058
1059 return buf;
1060 }
1061
1062
eap_ttls_encrypt_response(struct eap_sm * sm,struct eap_ttls_data * data,struct wpabuf * resp,u8 identifier,struct wpabuf ** out_data)1063 static int eap_ttls_encrypt_response(struct eap_sm *sm,
1064 struct eap_ttls_data *data,
1065 struct wpabuf *resp, u8 identifier,
1066 struct wpabuf **out_data)
1067 {
1068 if (resp == NULL)
1069 return 0;
1070
1071 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
1072 resp);
1073 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1074 data->ttls_version, identifier,
1075 resp, out_data)) {
1076 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 "
1077 "frame");
1078 wpabuf_clear_free(resp);
1079 return -1;
1080 }
1081 wpabuf_clear_free(resp);
1082
1083 return 0;
1084 }
1085
1086
eap_ttls_process_phase2_eap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct ttls_parse_avp * parse,struct wpabuf ** resp)1087 static int eap_ttls_process_phase2_eap(struct eap_sm *sm,
1088 struct eap_ttls_data *data,
1089 struct eap_method_ret *ret,
1090 struct ttls_parse_avp *parse,
1091 struct wpabuf **resp)
1092 {
1093 struct eap_hdr *hdr;
1094 size_t len;
1095
1096 if (parse->eapdata == NULL) {
1097 wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the "
1098 "packet - dropped");
1099 return -1;
1100 }
1101
1102 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1103 parse->eapdata, parse->eap_len);
1104 hdr = (struct eap_hdr *) parse->eapdata;
1105
1106 if (parse->eap_len < sizeof(*hdr)) {
1107 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP "
1108 "frame (len=%lu, expected %lu or more) - dropped",
1109 (unsigned long) parse->eap_len,
1110 (unsigned long) sizeof(*hdr));
1111 return -1;
1112 }
1113 len = be_to_host16(hdr->length);
1114 if (len > parse->eap_len) {
1115 wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 "
1116 "EAP frame (EAP hdr len=%lu, EAP data len in "
1117 "AVP=%lu)",
1118 (unsigned long) len,
1119 (unsigned long) parse->eap_len);
1120 return -1;
1121 }
1122 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1123 "identifier=%d length=%lu",
1124 hdr->code, hdr->identifier, (unsigned long) len);
1125 switch (hdr->code) {
1126 case EAP_CODE_REQUEST:
1127 if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) {
1128 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1129 "processing failed");
1130 return -1;
1131 }
1132 break;
1133 default:
1134 wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1135 "Phase 2 EAP header", hdr->code);
1136 return -1;
1137 }
1138
1139 return 0;
1140 }
1141
1142
eap_ttls_process_phase2_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct ttls_parse_avp * parse)1143 static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
1144 struct eap_ttls_data *data,
1145 struct eap_method_ret *ret,
1146 struct ttls_parse_avp *parse)
1147 {
1148 #ifdef EAP_MSCHAPv2
1149 if (parse->mschapv2_error) {
1150 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1151 "MS-CHAP-Error - failed");
1152 ret->methodState = METHOD_DONE;
1153 ret->decision = DECISION_FAIL;
1154 /* Reply with empty data to ACK error */
1155 return 1;
1156 }
1157
1158 if (parse->mschapv2 == NULL) {
1159 #ifdef EAP_TNC
1160 if (data->phase2_success && parse->eapdata) {
1161 /*
1162 * Allow EAP-TNC to be started after successfully
1163 * completed MSCHAPV2.
1164 */
1165 return 1;
1166 }
1167 #endif /* EAP_TNC */
1168 wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP "
1169 "received for Phase2 MSCHAPV2");
1170 return -1;
1171 }
1172 if (parse->mschapv2[0] != data->ident) {
1173 wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 "
1174 "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)",
1175 parse->mschapv2[0], data->ident);
1176 return -1;
1177 }
1178 if (!data->auth_response_valid ||
1179 mschapv2_verify_auth_response(data->auth_response,
1180 parse->mschapv2 + 1, 42)) {
1181 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator "
1182 "response in Phase 2 MSCHAPV2 success request");
1183 return -1;
1184 }
1185
1186 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1187 "authentication succeeded");
1188 ret->methodState = METHOD_DONE;
1189 ret->decision = DECISION_UNCOND_SUCC;
1190 data->phase2_success = 1;
1191
1192 /*
1193 * Reply with empty data; authentication server will reply
1194 * with EAP-Success after this.
1195 */
1196 return 1;
1197 #else /* EAP_MSCHAPv2 */
1198 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
1199 return -1;
1200 #endif /* EAP_MSCHAPv2 */
1201 }
1202
1203
1204 #ifdef EAP_TNC
eap_ttls_process_tnc_start(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct ttls_parse_avp * parse,struct wpabuf ** resp)1205 static int eap_ttls_process_tnc_start(struct eap_sm *sm,
1206 struct eap_ttls_data *data,
1207 struct eap_method_ret *ret,
1208 struct ttls_parse_avp *parse,
1209 struct wpabuf **resp)
1210 {
1211 /* TNC uses inner EAP method after non-EAP TTLS phase 2. */
1212 if (parse->eapdata == NULL) {
1213 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1214 "unexpected tunneled data (no EAP)");
1215 return -1;
1216 }
1217
1218 if (!data->ready_for_tnc) {
1219 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1220 "EAP after non-EAP, but not ready for TNC");
1221 return -1;
1222 }
1223
1224 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
1225 "non-EAP method");
1226 data->tnc_started = 1;
1227
1228 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0)
1229 return -1;
1230
1231 return 0;
1232 }
1233 #endif /* EAP_TNC */
1234
1235
eap_ttls_process_decrypted(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,struct ttls_parse_avp * parse,struct wpabuf * in_decrypted,struct wpabuf ** out_data)1236 static int eap_ttls_process_decrypted(struct eap_sm *sm,
1237 struct eap_ttls_data *data,
1238 struct eap_method_ret *ret,
1239 u8 identifier,
1240 struct ttls_parse_avp *parse,
1241 struct wpabuf *in_decrypted,
1242 struct wpabuf **out_data)
1243 {
1244 struct wpabuf *resp = NULL;
1245 struct eap_peer_config *config = eap_get_config(sm);
1246 int res;
1247 enum phase2_types phase2_type = data->phase2_type;
1248
1249 #ifdef EAP_TNC
1250 if (data->tnc_started)
1251 phase2_type = EAP_TTLS_PHASE2_EAP;
1252 #endif /* EAP_TNC */
1253
1254 switch (phase2_type) {
1255 case EAP_TTLS_PHASE2_EAP:
1256 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) <
1257 0)
1258 return -1;
1259 break;
1260 case EAP_TTLS_PHASE2_MSCHAPV2:
1261 res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse);
1262 #ifdef EAP_TNC
1263 if (res == 1 && parse->eapdata && data->phase2_success) {
1264 /*
1265 * TNC may be required as the next
1266 * authentication method within the tunnel.
1267 */
1268 ret->methodState = METHOD_MAY_CONT;
1269 data->ready_for_tnc = 1;
1270 if (eap_ttls_process_tnc_start(sm, data, ret, parse,
1271 &resp) == 0)
1272 break;
1273 }
1274 #endif /* EAP_TNC */
1275 return res;
1276 case EAP_TTLS_PHASE2_MSCHAP:
1277 case EAP_TTLS_PHASE2_PAP:
1278 case EAP_TTLS_PHASE2_CHAP:
1279 #ifdef EAP_TNC
1280 if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) <
1281 0)
1282 return -1;
1283 break;
1284 #else /* EAP_TNC */
1285 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1286 * requests to the supplicant */
1287 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1288 "tunneled data");
1289 return -1;
1290 #endif /* EAP_TNC */
1291 }
1292
1293 if (resp) {
1294 if (eap_ttls_encrypt_response(sm, data, resp, identifier,
1295 out_data) < 0)
1296 return -1;
1297 } else if (config->pending_req_identity ||
1298 config->pending_req_password ||
1299 config->pending_req_otp ||
1300 config->pending_req_new_password ||
1301 config->pending_req_sim) {
1302 wpabuf_clear_free(data->pending_phase2_req);
1303 data->pending_phase2_req = wpabuf_dup(in_decrypted);
1304 }
1305
1306 return 0;
1307 }
1308
1309
eap_ttls_implicit_identity_request(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,struct wpabuf ** out_data)1310 static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
1311 struct eap_ttls_data *data,
1312 struct eap_method_ret *ret,
1313 u8 identifier,
1314 struct wpabuf **out_data)
1315 {
1316 int retval = 0;
1317 struct eap_hdr *hdr;
1318 struct wpabuf *resp;
1319
1320 hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
1321 if (hdr == NULL) {
1322 ret->methodState = METHOD_DONE;
1323 ret->decision = DECISION_FAIL;
1324 return -1;
1325 }
1326
1327 resp = NULL;
1328 if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
1329 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1330 "processing failed");
1331 retval = -1;
1332 } else {
1333 struct eap_peer_config *config = eap_get_config(sm);
1334 if (resp == NULL &&
1335 (config->pending_req_identity ||
1336 config->pending_req_password ||
1337 config->pending_req_otp ||
1338 config->pending_req_new_password ||
1339 config->pending_req_sim)) {
1340 /*
1341 * Use empty buffer to force implicit request
1342 * processing when EAP request is re-processed after
1343 * user input.
1344 */
1345 wpabuf_clear_free(data->pending_phase2_req);
1346 data->pending_phase2_req = wpabuf_alloc(0);
1347 }
1348
1349 retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
1350 out_data);
1351 }
1352
1353 os_free(hdr);
1354
1355 if (retval < 0) {
1356 ret->methodState = METHOD_DONE;
1357 ret->decision = DECISION_FAIL;
1358 }
1359
1360 return retval;
1361 }
1362
1363
eap_ttls_phase2_start(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,struct wpabuf ** out_data)1364 static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
1365 struct eap_method_ret *ret, u8 identifier,
1366 struct wpabuf **out_data)
1367 {
1368 data->phase2_start = 0;
1369
1370 /*
1371 * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
1372 * if TLS part was indeed resuming a previous session. Most
1373 * Authentication Servers terminate EAP-TTLS before reaching this
1374 * point, but some do not. Make wpa_supplicant stop phase 2 here, if
1375 * needed.
1376 */
1377 if (data->reauth &&
1378 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
1379 wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
1380 "skip phase 2");
1381 *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
1382 data->ttls_version);
1383 ret->methodState = METHOD_DONE;
1384 ret->decision = DECISION_UNCOND_SUCC;
1385 data->phase2_success = 1;
1386 return 0;
1387 }
1388
1389 return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
1390 out_data);
1391 }
1392
1393
eap_ttls_decrypt(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,const struct wpabuf * in_data,struct wpabuf ** out_data)1394 static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
1395 struct eap_method_ret *ret, u8 identifier,
1396 const struct wpabuf *in_data,
1397 struct wpabuf **out_data)
1398 {
1399 struct wpabuf *in_decrypted = NULL;
1400 int retval = 0;
1401 struct ttls_parse_avp parse;
1402
1403 os_memset(&parse, 0, sizeof(parse));
1404
1405 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1406 " Phase 2",
1407 in_data ? (unsigned long) wpabuf_len(in_data) : 0);
1408
1409 if (data->pending_phase2_req) {
1410 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
1411 "skip decryption and use old data");
1412 /* Clear TLS reassembly state. */
1413 eap_peer_tls_reset_input(&data->ssl);
1414
1415 in_decrypted = data->pending_phase2_req;
1416 data->pending_phase2_req = NULL;
1417 if (wpabuf_len(in_decrypted) == 0) {
1418 wpabuf_clear_free(in_decrypted);
1419 return eap_ttls_implicit_identity_request(
1420 sm, data, ret, identifier, out_data);
1421 }
1422 goto continue_req;
1423 }
1424
1425 if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
1426 data->phase2_start) {
1427 return eap_ttls_phase2_start(sm, data, ret, identifier,
1428 out_data);
1429 }
1430
1431 if (in_data == NULL || wpabuf_len(in_data) == 0) {
1432 /* Received TLS ACK - requesting more fragments */
1433 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1434 data->ttls_version,
1435 identifier, NULL, out_data);
1436 }
1437
1438 retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1439 if (retval)
1440 goto done;
1441
1442 continue_req:
1443 data->phase2_start = 0;
1444
1445 if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
1446 retval = -1;
1447 goto done;
1448 }
1449
1450 retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
1451 &parse, in_decrypted, out_data);
1452
1453 done:
1454 wpabuf_clear_free(in_decrypted);
1455 os_free(parse.eapdata);
1456
1457 if (retval < 0) {
1458 ret->methodState = METHOD_DONE;
1459 ret->decision = DECISION_FAIL;
1460 }
1461
1462 return retval;
1463 }
1464
1465
eap_ttls_process_handshake(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,const struct wpabuf * in_data,struct wpabuf ** out_data)1466 static int eap_ttls_process_handshake(struct eap_sm *sm,
1467 struct eap_ttls_data *data,
1468 struct eap_method_ret *ret,
1469 u8 identifier,
1470 const struct wpabuf *in_data,
1471 struct wpabuf **out_data)
1472 {
1473 int res;
1474
1475 if (sm->waiting_ext_cert_check && data->pending_resp) {
1476 struct eap_peer_config *config = eap_get_config(sm);
1477
1478 if (config->pending_ext_cert_check == EXT_CERT_CHECK_GOOD) {
1479 wpa_printf(MSG_DEBUG,
1480 "EAP-TTLS: External certificate check succeeded - continue handshake");
1481 *out_data = data->pending_resp;
1482 data->pending_resp = NULL;
1483 sm->waiting_ext_cert_check = 0;
1484 return 0;
1485 }
1486
1487 if (config->pending_ext_cert_check == EXT_CERT_CHECK_BAD) {
1488 wpa_printf(MSG_DEBUG,
1489 "EAP-TTLS: External certificate check failed - force authentication failure");
1490 ret->methodState = METHOD_DONE;
1491 ret->decision = DECISION_FAIL;
1492 sm->waiting_ext_cert_check = 0;
1493 return 0;
1494 }
1495
1496 wpa_printf(MSG_DEBUG,
1497 "EAP-TTLS: Continuing to wait external server certificate validation");
1498 return 0;
1499 }
1500
1501 res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
1502 data->ttls_version, identifier,
1503 in_data, out_data);
1504 if (res < 0) {
1505 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS processing failed");
1506 ret->methodState = METHOD_DONE;
1507 ret->decision = DECISION_FAIL;
1508 return -1;
1509 }
1510
1511 if (sm->waiting_ext_cert_check) {
1512 wpa_printf(MSG_DEBUG,
1513 "EAP-TTLS: Waiting external server certificate validation");
1514 wpabuf_clear_free(data->pending_resp);
1515 data->pending_resp = *out_data;
1516 *out_data = NULL;
1517 return 0;
1518 }
1519
1520 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1521 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
1522 "Phase 2");
1523 if (data->resuming) {
1524 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
1525 "skip Phase 2");
1526 ret->decision = DECISION_COND_SUCC;
1527 ret->methodState = METHOD_MAY_CONT;
1528 }
1529 data->phase2_start = 1;
1530 eap_ttls_v0_derive_key(sm, data);
1531
1532 if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
1533 if (eap_ttls_decrypt(sm, data, ret, identifier,
1534 NULL, out_data)) {
1535 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1536 "failed to process early "
1537 "start for Phase 2");
1538 }
1539 res = 0;
1540 }
1541 data->resuming = 0;
1542 }
1543
1544 if (res == 2) {
1545 /*
1546 * Application data included in the handshake message.
1547 */
1548 wpabuf_clear_free(data->pending_phase2_req);
1549 data->pending_phase2_req = *out_data;
1550 *out_data = NULL;
1551 res = eap_ttls_decrypt(sm, data, ret, identifier, in_data,
1552 out_data);
1553 }
1554
1555 return res;
1556 }
1557
1558
eap_ttls_check_auth_status(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret)1559 static void eap_ttls_check_auth_status(struct eap_sm *sm,
1560 struct eap_ttls_data *data,
1561 struct eap_method_ret *ret)
1562 {
1563 if (ret->methodState == METHOD_DONE) {
1564 ret->allowNotifications = FALSE;
1565 if (ret->decision == DECISION_UNCOND_SUCC ||
1566 ret->decision == DECISION_COND_SUCC) {
1567 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1568 "completed successfully");
1569 data->phase2_success = 1;
1570 data->decision_succ = ret->decision;
1571 #ifdef EAP_TNC
1572 if (!data->ready_for_tnc && !data->tnc_started) {
1573 /*
1574 * TNC may be required as the next
1575 * authentication method within the tunnel.
1576 */
1577 ret->methodState = METHOD_MAY_CONT;
1578 data->ready_for_tnc = 1;
1579 }
1580 #endif /* EAP_TNC */
1581 }
1582 } else if (ret->methodState == METHOD_MAY_CONT &&
1583 (ret->decision == DECISION_UNCOND_SUCC ||
1584 ret->decision == DECISION_COND_SUCC)) {
1585 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1586 "completed successfully (MAY_CONT)");
1587 data->phase2_success = 1;
1588 data->decision_succ = ret->decision;
1589 } else if (data->decision_succ != DECISION_FAIL &&
1590 data->phase2_success &&
1591 !data->ssl.tls_out) {
1592 /*
1593 * This is needed to cover the case where the final Phase 2
1594 * message gets fragmented since fragmentation clears
1595 * decision back to FAIL.
1596 */
1597 wpa_printf(MSG_DEBUG,
1598 "EAP-TTLS: Restore success decision after fragmented frame sent completely");
1599 ret->decision = data->decision_succ;
1600 }
1601 }
1602
1603
eap_ttls_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1604 static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
1605 struct eap_method_ret *ret,
1606 const struct wpabuf *reqData)
1607 {
1608 size_t left;
1609 int res;
1610 u8 flags, id;
1611 struct wpabuf *resp;
1612 const u8 *pos;
1613 struct eap_ttls_data *data = priv;
1614 struct wpabuf msg;
1615
1616 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
1617 reqData, &left, &flags);
1618 if (pos == NULL)
1619 return NULL;
1620 id = eap_get_id(reqData);
1621
1622 if (flags & EAP_TLS_FLAGS_START) {
1623 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own "
1624 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1625 data->ttls_version);
1626
1627 /* RFC 5281, Ch. 9.2:
1628 * "This packet MAY contain additional information in the form
1629 * of AVPs, which may provide useful hints to the client"
1630 * For now, ignore any potential extra data.
1631 */
1632 left = 0;
1633 }
1634
1635 wpabuf_set(&msg, pos, left);
1636
1637 resp = NULL;
1638 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1639 !data->resuming) {
1640 res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
1641 } else {
1642 res = eap_ttls_process_handshake(sm, data, ret, id,
1643 &msg, &resp);
1644 }
1645
1646 eap_ttls_check_auth_status(sm, data, ret);
1647
1648 /* FIX: what about res == -1? Could just move all error processing into
1649 * the other functions and get rid of this res==1 case here. */
1650 if (res == 1) {
1651 wpabuf_clear_free(resp);
1652 return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
1653 data->ttls_version);
1654 }
1655 return resp;
1656 }
1657
1658
eap_ttls_has_reauth_data(struct eap_sm * sm,void * priv)1659 static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1660 {
1661 struct eap_ttls_data *data = priv;
1662 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1663 data->phase2_success;
1664 }
1665
1666
eap_ttls_deinit_for_reauth(struct eap_sm * sm,void * priv)1667 static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1668 {
1669 struct eap_ttls_data *data = priv;
1670
1671 if (data->phase2_priv && data->phase2_method &&
1672 data->phase2_method->deinit_for_reauth)
1673 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1674 wpabuf_clear_free(data->pending_phase2_req);
1675 data->pending_phase2_req = NULL;
1676 wpabuf_clear_free(data->pending_resp);
1677 data->pending_resp = NULL;
1678 data->decision_succ = DECISION_FAIL;
1679 #ifdef EAP_TNC
1680 data->ready_for_tnc = 0;
1681 data->tnc_started = 0;
1682 #endif /* EAP_TNC */
1683 }
1684
1685
eap_ttls_init_for_reauth(struct eap_sm * sm,void * priv)1686 static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1687 {
1688 struct eap_ttls_data *data = priv;
1689 eap_ttls_free_key(data);
1690 os_free(data->session_id);
1691 data->session_id = NULL;
1692 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1693 os_free(data);
1694 return NULL;
1695 }
1696 if (data->phase2_priv && data->phase2_method &&
1697 data->phase2_method->init_for_reauth)
1698 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1699 data->phase2_start = 0;
1700 data->phase2_success = 0;
1701 data->resuming = 1;
1702 data->reauth = 1;
1703 return priv;
1704 }
1705
1706
eap_ttls_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1707 static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1708 size_t buflen, int verbose)
1709 {
1710 struct eap_ttls_data *data = priv;
1711 int len, ret;
1712
1713 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1714 ret = os_snprintf(buf + len, buflen - len,
1715 "EAP-TTLSv%d Phase2 method=",
1716 data->ttls_version);
1717 if (os_snprintf_error(buflen - len, ret))
1718 return len;
1719 len += ret;
1720 switch (data->phase2_type) {
1721 case EAP_TTLS_PHASE2_EAP:
1722 ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
1723 data->phase2_method ?
1724 data->phase2_method->name : "?");
1725 break;
1726 case EAP_TTLS_PHASE2_MSCHAPV2:
1727 ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
1728 break;
1729 case EAP_TTLS_PHASE2_MSCHAP:
1730 ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
1731 break;
1732 case EAP_TTLS_PHASE2_PAP:
1733 ret = os_snprintf(buf + len, buflen - len, "PAP\n");
1734 break;
1735 case EAP_TTLS_PHASE2_CHAP:
1736 ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
1737 break;
1738 default:
1739 ret = 0;
1740 break;
1741 }
1742 if (os_snprintf_error(buflen - len, ret))
1743 return len;
1744 len += ret;
1745
1746 return len;
1747 }
1748
1749
eap_ttls_isKeyAvailable(struct eap_sm * sm,void * priv)1750 static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1751 {
1752 struct eap_ttls_data *data = priv;
1753 return data->key_data != NULL && data->phase2_success;
1754 }
1755
1756
eap_ttls_getKey(struct eap_sm * sm,void * priv,size_t * len)1757 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1758 {
1759 struct eap_ttls_data *data = priv;
1760 u8 *key;
1761
1762 if (data->key_data == NULL || !data->phase2_success)
1763 return NULL;
1764
1765 key = os_memdup(data->key_data, EAP_TLS_KEY_LEN);
1766 if (key == NULL)
1767 return NULL;
1768
1769 *len = EAP_TLS_KEY_LEN;
1770
1771 return key;
1772 }
1773
1774
eap_ttls_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1775 static u8 * eap_ttls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1776 {
1777 struct eap_ttls_data *data = priv;
1778 u8 *id;
1779
1780 if (data->session_id == NULL || !data->phase2_success)
1781 return NULL;
1782
1783 id = os_memdup(data->session_id, data->id_len);
1784 if (id == NULL)
1785 return NULL;
1786
1787 *len = data->id_len;
1788
1789 return id;
1790 }
1791
1792
eap_ttls_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1793 static u8 * eap_ttls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1794 {
1795 struct eap_ttls_data *data = priv;
1796 u8 *key;
1797
1798 if (data->key_data == NULL)
1799 return NULL;
1800
1801 key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
1802 if (key == NULL)
1803 return NULL;
1804
1805 *len = EAP_EMSK_LEN;
1806
1807 return key;
1808 }
1809
1810
eap_peer_ttls_register(void)1811 int eap_peer_ttls_register(void)
1812 {
1813 struct eap_method *eap;
1814
1815 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1816 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1817 if (eap == NULL)
1818 return -1;
1819
1820 eap->init = eap_ttls_init;
1821 eap->deinit = eap_ttls_deinit;
1822 eap->process = eap_ttls_process;
1823 eap->isKeyAvailable = eap_ttls_isKeyAvailable;
1824 eap->getKey = eap_ttls_getKey;
1825 eap->getSessionId = eap_ttls_get_session_id;
1826 eap->get_status = eap_ttls_get_status;
1827 eap->has_reauth_data = eap_ttls_has_reauth_data;
1828 eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
1829 eap->init_for_reauth = eap_ttls_init_for_reauth;
1830 eap->get_emsk = eap_ttls_get_emsk;
1831
1832 return eap_peer_method_register(eap);
1833 }
1834