1 /*
2 * EAP peer method: EAP-TTLS (RFC 5281)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eap_peer/eap_i.h"
19 #include "eap_peer/eap_tls_common.h"
20 #include "eap_peer/eap_config.h"
21 #include "crypto/ms_funcs.h"
22 #include "crypto/sha1.h"
23 #include "eap_common/chap.h"
24 #include "crypto/tls.h"
25 #include "mschapv2.h"
26 #include "eap_common/eap_ttls.h"
27
28
29 /* Maximum supported TTLS version
30 * 0 = RFC 5281
31 * 1 = draft-funk-eap-ttls-v1-00.txt
32 */
33 #ifndef EAP_TTLS_VERSION
34 #define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */
35 #endif /* EAP_TTLS_VERSION */
36
37
38 #define MSCHAPV2_KEY_LEN 16
39 #define MSCHAPV2_NT_RESPONSE_LEN 24
40
41
42 static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
43
44
45 struct eap_ttls_data {
46 struct eap_ssl_data ssl;
47 int ssl_initialized;
48
49 int ttls_version, force_ttls_version;
50
51 const struct eap_method *phase2_method;
52 void *phase2_priv;
53 int phase2_success;
54 int phase2_start;
55
56 enum phase2_types {
57 EAP_TTLS_PHASE2_EAP,
58 EAP_TTLS_PHASE2_MSCHAPV2,
59 EAP_TTLS_PHASE2_MSCHAP,
60 EAP_TTLS_PHASE2_PAP,
61 EAP_TTLS_PHASE2_CHAP
62 } phase2_type;
63 struct eap_method_type phase2_eap_type;
64 struct eap_method_type *phase2_eap_types;
65 size_t num_phase2_eap_types;
66
67 u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN];
68 int auth_response_valid;
69 u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */
70 u8 ident;
71 int resuming; /* starting a resumed session */
72 int reauth; /* reauthentication */
73 u8 *key_data;
74
75 struct wpabuf *pending_phase2_req;
76
77 #ifdef EAP_TNC
78 int ready_for_tnc;
79 int tnc_started;
80 #endif /* EAP_TNC */
81 };
82
83
eap_ttls_init(struct eap_sm * sm)84 static void * eap_ttls_init(struct eap_sm *sm)
85 {
86 struct eap_ttls_data *data;
87 struct eap_peer_config *config = eap_get_config(sm);
88 char *selected;
89
90 data = os_zalloc(sizeof(*data));
91 if (data == NULL)
92 return NULL;
93 data->ttls_version = EAP_TTLS_VERSION;
94 data->force_ttls_version = -1;
95 selected = "EAP";
96 data->phase2_type = EAP_TTLS_PHASE2_EAP;
97
98 #if EAP_TTLS_VERSION > 0
99 if (config && config->phase1) {
100 const char *pos = os_strstr(config->phase1, "ttlsver=");
101 if (pos) {
102 data->force_ttls_version = atoi(pos + 8);
103 data->ttls_version = data->force_ttls_version;
104 wpa_printf(MSG_DEBUG, "EAP-TTLS: Forced TTLS version "
105 "%d", data->force_ttls_version);
106 }
107 }
108 #endif /* EAP_TTLS_VERSION */
109
110 if (config && config->phase2) {
111 if (os_strstr(config->phase2, "autheap=")) {
112 selected = "EAP";
113 data->phase2_type = EAP_TTLS_PHASE2_EAP;
114 } else if (os_strstr(config->phase2, "auth=MSCHAPV2")) {
115 selected = "MSCHAPV2";
116 data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
117 } else if (os_strstr(config->phase2, "auth=MSCHAP")) {
118 selected = "MSCHAP";
119 data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
120 } else if (os_strstr(config->phase2, "auth=PAP")) {
121 selected = "PAP";
122 data->phase2_type = EAP_TTLS_PHASE2_PAP;
123 } else if (os_strstr(config->phase2, "auth=CHAP")) {
124 selected = "CHAP";
125 data->phase2_type = EAP_TTLS_PHASE2_CHAP;
126 }
127 }
128 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
129
130 if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
131 if (eap_peer_select_phase2_methods(config, "autheap=",
132 &data->phase2_eap_types,
133 &data->num_phase2_eap_types)
134 < 0) {
135 eap_ttls_deinit(sm, data);
136 return NULL;
137 }
138
139 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
140 data->phase2_eap_type.method = EAP_TYPE_NONE;
141 }
142
143 #if EAP_TTLS_VERSION > 0
144 if (!(tls_capabilities(sm->ssl_ctx) & TLS_CAPABILITY_IA) &&
145 data->ttls_version > 0) {
146 if (data->force_ttls_version > 0) {
147 wpa_printf(MSG_INFO, "EAP-TTLS: Forced TTLSv%d and "
148 "TLS library does not support TLS/IA.",
149 data->force_ttls_version);
150 eap_ttls_deinit(sm, data);
151 return NULL;
152 }
153 data->ttls_version = 0;
154 }
155 #endif /* EAP_TTLS_VERSION */
156
157 return data;
158 }
159
160
eap_ttls_phase2_eap_deinit(struct eap_sm * sm,struct eap_ttls_data * data)161 static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm,
162 struct eap_ttls_data *data)
163 {
164 if (data->phase2_priv && data->phase2_method) {
165 data->phase2_method->deinit(sm, data->phase2_priv);
166 data->phase2_method = NULL;
167 data->phase2_priv = NULL;
168 }
169 }
170
171
eap_ttls_deinit(struct eap_sm * sm,void * priv)172 static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
173 {
174 struct eap_ttls_data *data = priv;
175 if (data == NULL)
176 return;
177 eap_ttls_phase2_eap_deinit(sm, data);
178 os_free(data->phase2_eap_types);
179 if (data->ssl_initialized)
180 eap_peer_tls_ssl_deinit(sm, &data->ssl);
181 os_free(data->key_data);
182 wpabuf_free(data->pending_phase2_req);
183 os_free(data);
184 }
185
186
eap_ttls_avp_hdr(u8 * avphdr,u32 avp_code,u32 vendor_id,int mandatory,size_t len)187 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
188 int mandatory, size_t len)
189 {
190 struct ttls_avp_vendor *avp;
191 u8 flags;
192 size_t hdrlen;
193
194 avp = (struct ttls_avp_vendor *) avphdr;
195 flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
196 if (vendor_id) {
197 flags |= AVP_FLAGS_VENDOR;
198 hdrlen = sizeof(*avp);
199 avp->vendor_id = host_to_be32(vendor_id);
200 } else {
201 hdrlen = sizeof(struct ttls_avp);
202 }
203
204 avp->avp_code = host_to_be32(avp_code);
205 avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
206
207 return avphdr + hdrlen;
208 }
209
210
eap_ttls_avp_add(u8 * start,u8 * avphdr,u32 avp_code,u32 vendor_id,int mandatory,const u8 * data,size_t len)211 static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
212 u32 vendor_id, int mandatory,
213 const u8 *data, size_t len)
214 {
215 u8 *pos;
216 pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
217 os_memcpy(pos, data, len);
218 pos += len;
219 AVP_PAD(start, pos);
220 return pos;
221 }
222
223
eap_ttls_avp_encapsulate(struct wpabuf ** resp,u32 avp_code,int mandatory)224 static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code,
225 int mandatory)
226 {
227 struct wpabuf *msg;
228 u8 *avp, *pos;
229
230 msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4);
231 if (msg == NULL) {
232 wpabuf_free(*resp);
233 *resp = NULL;
234 return -1;
235 }
236
237 avp = wpabuf_mhead(msg);
238 pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp));
239 os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp));
240 pos += wpabuf_len(*resp);
241 AVP_PAD(avp, pos);
242 wpabuf_free(*resp);
243 wpabuf_put(msg, pos - avp);
244 *resp = msg;
245 return 0;
246 }
247
248
249 #if EAP_TTLS_VERSION > 0
eap_ttls_ia_permute_inner_secret(struct eap_sm * sm,struct eap_ttls_data * data,const u8 * key,size_t key_len)250 static int eap_ttls_ia_permute_inner_secret(struct eap_sm *sm,
251 struct eap_ttls_data *data,
252 const u8 *key, size_t key_len)
253 {
254 u8 *buf;
255 size_t buf_len;
256 int ret;
257
258 if (key) {
259 buf_len = 2 + key_len;
260 buf = os_malloc(buf_len);
261 if (buf == NULL)
262 return -1;
263 WPA_PUT_BE16(buf, key_len);
264 os_memcpy(buf + 2, key, key_len);
265 } else {
266 buf = NULL;
267 buf_len = 0;
268 }
269
270 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Session keys for TLS/IA inner "
271 "secret permutation", buf, buf_len);
272 ret = tls_connection_ia_permute_inner_secret(sm->ssl_ctx,
273 data->ssl.conn,
274 buf, buf_len);
275 os_free(buf);
276
277 return ret;
278 }
279 #endif /* EAP_TTLS_VERSION */
280
281
eap_ttls_v0_derive_key(struct eap_sm * sm,struct eap_ttls_data * data)282 static int eap_ttls_v0_derive_key(struct eap_sm *sm,
283 struct eap_ttls_data *data)
284 {
285 os_free(data->key_data);
286 data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
287 "ttls keying material",
288 EAP_TLS_KEY_LEN);
289 if (!data->key_data) {
290 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
291 return -1;
292 }
293
294 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
295 data->key_data, EAP_TLS_KEY_LEN);
296
297 return 0;
298 }
299
300
301 #if EAP_TTLS_VERSION > 0
eap_ttls_v1_derive_key(struct eap_sm * sm,struct eap_ttls_data * data)302 static int eap_ttls_v1_derive_key(struct eap_sm *sm,
303 struct eap_ttls_data *data)
304 {
305 struct tls_keys keys;
306 u8 *rnd;
307
308 os_free(data->key_data);
309 data->key_data = NULL;
310
311 os_memset(&keys, 0, sizeof(keys));
312 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
313 keys.client_random == NULL || keys.server_random == NULL ||
314 keys.inner_secret == NULL) {
315 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
316 "client random, or server random to derive keying "
317 "material");
318 return -1;
319 }
320
321 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
322 data->key_data = os_malloc(EAP_TLS_KEY_LEN);
323 if (rnd == NULL || data->key_data == NULL) {
324 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for key derivation");
325 os_free(rnd);
326 os_free(data->key_data);
327 data->key_data = NULL;
328 return -1;
329 }
330 os_memcpy(rnd, keys.client_random, keys.client_random_len);
331 os_memcpy(rnd + keys.client_random_len, keys.server_random,
332 keys.server_random_len);
333
334 if (tls_prf(keys.inner_secret, keys.inner_secret_len,
335 "ttls v1 keying material", rnd, keys.client_random_len +
336 keys.server_random_len, data->key_data, EAP_TLS_KEY_LEN)) {
337 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
338 os_free(rnd);
339 os_free(data->key_data);
340 data->key_data = NULL;
341 return -1;
342 }
343
344 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: client/server random",
345 rnd, keys.client_random_len + keys.server_random_len);
346 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: TLS/IA inner secret",
347 keys.inner_secret, keys.inner_secret_len);
348
349 os_free(rnd);
350
351 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
352 data->key_data, EAP_TLS_KEY_LEN);
353
354 return 0;
355 }
356 #endif /* EAP_TTLS_VERSION */
357
358
eap_ttls_implicit_challenge(struct eap_sm * sm,struct eap_ttls_data * data,size_t len)359 static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
360 struct eap_ttls_data *data, size_t len)
361 {
362 #if EAP_TTLS_VERSION > 0
363 struct tls_keys keys;
364 u8 *challenge, *rnd;
365 #endif /* EAP_TTLS_VERSION */
366
367 if (data->ttls_version == 0) {
368 return eap_peer_tls_derive_key(sm, &data->ssl,
369 "ttls challenge", len);
370 }
371
372 #if EAP_TTLS_VERSION > 0
373
374 os_memset(&keys, 0, sizeof(keys));
375 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
376 keys.client_random == NULL || keys.server_random == NULL ||
377 keys.inner_secret == NULL) {
378 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
379 "client random, or server random to derive "
380 "implicit challenge");
381 return NULL;
382 }
383
384 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
385 challenge = os_malloc(len);
386 if (rnd == NULL || challenge == NULL) {
387 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for implicit "
388 "challenge derivation");
389 os_free(rnd);
390 os_free(challenge);
391 return NULL;
392 }
393 os_memcpy(rnd, keys.server_random, keys.server_random_len);
394 os_memcpy(rnd + keys.server_random_len, keys.client_random,
395 keys.client_random_len);
396
397 if (tls_prf(keys.inner_secret, keys.inner_secret_len,
398 "inner application challenge", rnd,
399 keys.client_random_len + keys.server_random_len,
400 challenge, len)) {
401 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive implicit "
402 "challenge");
403 os_free(rnd);
404 os_free(challenge);
405 return NULL;
406 }
407
408 os_free(rnd);
409
410 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived implicit challenge",
411 challenge, len);
412
413 return challenge;
414
415 #else /* EAP_TTLS_VERSION */
416
417 return NULL;
418
419 #endif /* EAP_TTLS_VERSION */
420 }
421
422
eap_ttlsv1_phase2_eap_finish(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret)423 static void eap_ttlsv1_phase2_eap_finish(struct eap_sm *sm,
424 struct eap_ttls_data *data,
425 struct eap_method_ret *ret)
426 {
427 #if EAP_TTLS_VERSION > 0
428 if (data->ttls_version > 0) {
429 const struct eap_method *m = data->phase2_method;
430 void *priv = data->phase2_priv;
431
432 /* TTLSv1 requires TLS/IA FinalPhaseFinished */
433 if (ret->decision == DECISION_UNCOND_SUCC)
434 ret->decision = DECISION_COND_SUCC;
435 ret->methodState = METHOD_CONT;
436
437 if (ret->decision == DECISION_COND_SUCC &&
438 m->isKeyAvailable && m->getKey &&
439 m->isKeyAvailable(sm, priv)) {
440 u8 *key;
441 size_t key_len;
442 key = m->getKey(sm, priv, &key_len);
443 if (key) {
444 eap_ttls_ia_permute_inner_secret(
445 sm, data, key, key_len);
446 os_free(key);
447 }
448 }
449 }
450 #endif /* EAP_TTLS_VERSION */
451 }
452
453
eap_ttls_phase2_select_eap_method(struct eap_ttls_data * data,u8 method)454 static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data,
455 u8 method)
456 {
457 size_t i;
458 for (i = 0; i < data->num_phase2_eap_types; i++) {
459 if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF ||
460 data->phase2_eap_types[i].method != method)
461 continue;
462
463 data->phase2_eap_type.vendor =
464 data->phase2_eap_types[i].vendor;
465 data->phase2_eap_type.method =
466 data->phase2_eap_types[i].method;
467 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
468 "Phase 2 EAP vendor %d method %d",
469 data->phase2_eap_type.vendor,
470 data->phase2_eap_type.method);
471 break;
472 }
473 }
474
475
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)476 static int eap_ttls_phase2_eap_process(struct eap_sm *sm,
477 struct eap_ttls_data *data,
478 struct eap_method_ret *ret,
479 struct eap_hdr *hdr, size_t len,
480 struct wpabuf **resp)
481 {
482 struct wpabuf msg;
483 struct eap_method_ret iret;
484
485 os_memset(&iret, 0, sizeof(iret));
486 wpabuf_set(&msg, hdr, len);
487 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
488 &msg);
489 if ((iret.methodState == METHOD_DONE ||
490 iret.methodState == METHOD_MAY_CONT) &&
491 (iret.decision == DECISION_UNCOND_SUCC ||
492 iret.decision == DECISION_COND_SUCC ||
493 iret.decision == DECISION_FAIL)) {
494 ret->methodState = iret.methodState;
495 ret->decision = iret.decision;
496 }
497 eap_ttlsv1_phase2_eap_finish(sm, data, ret);
498
499 return 0;
500 }
501
502
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)503 static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm,
504 struct eap_ttls_data *data,
505 struct eap_method_ret *ret,
506 struct eap_hdr *hdr, size_t len,
507 u8 method, struct wpabuf **resp)
508 {
509 #ifdef EAP_TNC
510 if (data->tnc_started && data->phase2_method &&
511 data->phase2_priv && method == EAP_TYPE_TNC &&
512 data->phase2_eap_type.method == EAP_TYPE_TNC)
513 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len,
514 resp);
515
516 if (data->ready_for_tnc && !data->tnc_started &&
517 method == EAP_TYPE_TNC) {
518 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
519 "EAP method");
520 data->tnc_started = 1;
521 }
522
523 if (data->tnc_started) {
524 if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF ||
525 data->phase2_eap_type.method == EAP_TYPE_TNC) {
526 wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP "
527 "type %d for TNC", method);
528 return -1;
529 }
530
531 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
532 data->phase2_eap_type.method = method;
533 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
534 "Phase 2 EAP vendor %d method %d (TNC)",
535 data->phase2_eap_type.vendor,
536 data->phase2_eap_type.method);
537
538 if (data->phase2_type == EAP_TTLS_PHASE2_EAP)
539 eap_ttls_phase2_eap_deinit(sm, data);
540 }
541 #endif /* EAP_TNC */
542
543 if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
544 data->phase2_eap_type.method == EAP_TYPE_NONE)
545 eap_ttls_phase2_select_eap_method(data, method);
546
547 if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE)
548 {
549 if (eap_peer_tls_phase2_nak(data->phase2_eap_types,
550 data->num_phase2_eap_types,
551 hdr, resp))
552 return -1;
553 return 0;
554 }
555
556 if (data->phase2_priv == NULL) {
557 data->phase2_method = eap_peer_get_eap_method(
558 EAP_VENDOR_IETF, method);
559 if (data->phase2_method) {
560 sm->init_phase2 = 1;
561 data->phase2_priv = data->phase2_method->init(sm);
562 sm->init_phase2 = 0;
563 }
564 }
565 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
566 wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
567 "Phase 2 EAP method %d", method);
568 return -1;
569 }
570
571 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp);
572 }
573
574
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)575 static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
576 struct eap_ttls_data *data,
577 struct eap_method_ret *ret,
578 struct eap_hdr *hdr,
579 struct wpabuf **resp)
580 {
581 size_t len = be_to_host16(hdr->length);
582 u8 *pos;
583 struct eap_peer_config *config = eap_get_config(sm);
584
585 if (len <= sizeof(struct eap_hdr)) {
586 wpa_printf(MSG_INFO, "EAP-TTLS: too short "
587 "Phase 2 request (len=%lu)", (unsigned long) len);
588 return -1;
589 }
590 pos = (u8 *) (hdr + 1);
591 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
592 switch (*pos) {
593 case EAP_TYPE_IDENTITY:
594 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
595 break;
596 default:
597 if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len,
598 *pos, resp) < 0)
599 return -1;
600 break;
601 }
602
603 if (*resp == NULL &&
604 (config->pending_req_identity || config->pending_req_password ||
605 config->pending_req_otp)) {
606 return 0;
607 }
608
609 if (*resp == NULL)
610 return -1;
611
612 wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
613 *resp);
614 return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1);
615 }
616
617
eap_ttlsv1_permute_inner(struct eap_sm * sm,struct eap_ttls_data * data)618 static void eap_ttlsv1_permute_inner(struct eap_sm *sm,
619 struct eap_ttls_data *data)
620 {
621 #if EAP_TTLS_VERSION > 0
622 u8 session_key[2 * MSCHAPV2_KEY_LEN];
623
624 if (data->ttls_version == 0)
625 return;
626
627 get_asymetric_start_key(data->master_key, session_key,
628 MSCHAPV2_KEY_LEN, 0, 0);
629 get_asymetric_start_key(data->master_key,
630 session_key + MSCHAPV2_KEY_LEN,
631 MSCHAPV2_KEY_LEN, 1, 0);
632 eap_ttls_ia_permute_inner_secret(sm, data, session_key,
633 sizeof(session_key));
634 #endif /* EAP_TTLS_VERSION */
635 }
636
637
eap_ttls_phase2_request_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)638 static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
639 struct eap_ttls_data *data,
640 struct eap_method_ret *ret,
641 struct wpabuf **resp)
642 {
643 struct wpabuf *msg;
644 u8 *buf, *pos, *challenge, *peer_challenge;
645 const u8 *identity, *password;
646 size_t identity_len, password_len;
647 int pwhash;
648
649 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
650
651 identity = eap_get_config_identity(sm, &identity_len);
652 password = eap_get_config_password2(sm, &password_len, &pwhash);
653 if (identity == NULL || password == NULL)
654 return -1;
655
656 msg = wpabuf_alloc(identity_len + 1000);
657 if (msg == NULL) {
658 wpa_printf(MSG_ERROR,
659 "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
660 return -1;
661 }
662 pos = buf = wpabuf_mhead(msg);
663
664 /* User-Name */
665 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
666 identity, identity_len);
667
668 /* MS-CHAP-Challenge */
669 challenge = eap_ttls_implicit_challenge(
670 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
671 if (challenge == NULL) {
672 wpabuf_free(msg);
673 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
674 "implicit challenge");
675 return -1;
676 }
677 peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
678
679 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
680 RADIUS_VENDOR_ID_MICROSOFT, 1,
681 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
682
683 /* MS-CHAP2-Response */
684 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
685 RADIUS_VENDOR_ID_MICROSOFT, 1,
686 EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
687 data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
688 *pos++ = data->ident;
689 *pos++ = 0; /* Flags */
690 os_memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
691 pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
692 os_memset(pos, 0, 8); /* Reserved, must be zero */
693 pos += 8;
694 mschapv2_derive_response(identity, identity_len, password,
695 password_len, pwhash, challenge,
696 peer_challenge, pos, data->auth_response,
697 data->master_key);
698 data->auth_response_valid = 1;
699
700 eap_ttlsv1_permute_inner(sm, data);
701
702 pos += 24;
703 os_free(challenge);
704 AVP_PAD(buf, pos);
705
706 wpabuf_put(msg, pos - buf);
707 *resp = msg;
708
709 if (sm->workaround && data->ttls_version == 0) {
710 /* At least FreeRADIUS seems to be terminating
711 * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
712 * packet. */
713 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
714 "allow success without tunneled response");
715 ret->methodState = METHOD_MAY_CONT;
716 ret->decision = DECISION_COND_SUCC;
717 }
718
719 return 0;
720 }
721
722
eap_ttls_phase2_request_mschap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)723 static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
724 struct eap_ttls_data *data,
725 struct eap_method_ret *ret,
726 struct wpabuf **resp)
727 {
728 struct wpabuf *msg;
729 u8 *buf, *pos, *challenge;
730 const u8 *identity, *password;
731 size_t identity_len, password_len;
732 int pwhash;
733
734 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
735
736 identity = eap_get_config_identity(sm, &identity_len);
737 password = eap_get_config_password2(sm, &password_len, &pwhash);
738 if (identity == NULL || password == NULL)
739 return -1;
740
741 msg = wpabuf_alloc(identity_len + 1000);
742 if (msg == NULL) {
743 wpa_printf(MSG_ERROR,
744 "EAP-TTLS/MSCHAP: Failed to allocate memory");
745 return -1;
746 }
747 pos = buf = wpabuf_mhead(msg);
748
749 /* User-Name */
750 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
751 identity, identity_len);
752
753 /* MS-CHAP-Challenge */
754 challenge = eap_ttls_implicit_challenge(
755 sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
756 if (challenge == NULL) {
757 wpabuf_free(msg);
758 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
759 "implicit challenge");
760 return -1;
761 }
762
763 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
764 RADIUS_VENDOR_ID_MICROSOFT, 1,
765 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
766
767 /* MS-CHAP-Response */
768 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
769 RADIUS_VENDOR_ID_MICROSOFT, 1,
770 EAP_TTLS_MSCHAP_RESPONSE_LEN);
771 data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
772 *pos++ = data->ident;
773 *pos++ = 1; /* Flags: Use NT style passwords */
774 os_memset(pos, 0, 24); /* LM-Response */
775 pos += 24;
776 if (pwhash) {
777 challenge_response(challenge, password, pos); /* NT-Response */
778 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
779 password, 16);
780 } else {
781 nt_challenge_response(challenge, password, password_len,
782 pos); /* NT-Response */
783 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
784 password, password_len);
785 }
786 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
787 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
788 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
789 pos += 24;
790 os_free(challenge);
791 AVP_PAD(buf, pos);
792
793 wpabuf_put(msg, pos - buf);
794 *resp = msg;
795
796 if (data->ttls_version > 0) {
797 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
798 * so do not allow connection to be terminated yet. */
799 ret->methodState = METHOD_CONT;
800 ret->decision = DECISION_COND_SUCC;
801 } else {
802 /* EAP-TTLS/MSCHAP does not provide tunneled success
803 * notification, so assume that Phase2 succeeds. */
804 ret->methodState = METHOD_DONE;
805 ret->decision = DECISION_COND_SUCC;
806 }
807
808 return 0;
809 }
810
811
eap_ttls_phase2_request_pap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)812 static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
813 struct eap_ttls_data *data,
814 struct eap_method_ret *ret,
815 struct wpabuf **resp)
816 {
817 struct wpabuf *msg;
818 u8 *buf, *pos;
819 size_t pad;
820 const u8 *identity, *password;
821 size_t identity_len, password_len;
822
823 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
824
825 identity = eap_get_config_identity(sm, &identity_len);
826 password = eap_get_config_password(sm, &password_len);
827 if (identity == NULL || password == NULL)
828 return -1;
829
830 msg = wpabuf_alloc(identity_len + password_len + 100);
831 if (msg == NULL) {
832 wpa_printf(MSG_ERROR,
833 "EAP-TTLS/PAP: Failed to allocate memory");
834 return -1;
835 }
836 pos = buf = wpabuf_mhead(msg);
837
838 /* User-Name */
839 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
840 identity, identity_len);
841
842 /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
843 * the data, so no separate encryption is used in the AVP itself.
844 * However, the password is padded to obfuscate its length. */
845 pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15;
846 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
847 password_len + pad);
848 os_memcpy(pos, password, password_len);
849 pos += password_len;
850 os_memset(pos, 0, pad);
851 pos += pad;
852 AVP_PAD(buf, pos);
853
854 wpabuf_put(msg, pos - buf);
855 *resp = msg;
856
857 if (data->ttls_version > 0) {
858 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
859 * so do not allow connection to be terminated yet. */
860 ret->methodState = METHOD_CONT;
861 ret->decision = DECISION_COND_SUCC;
862 } else {
863 /* EAP-TTLS/PAP does not provide tunneled success notification,
864 * so assume that Phase2 succeeds. */
865 ret->methodState = METHOD_DONE;
866 ret->decision = DECISION_COND_SUCC;
867 }
868
869 return 0;
870 }
871
872
eap_ttls_phase2_request_chap(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct wpabuf ** resp)873 static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
874 struct eap_ttls_data *data,
875 struct eap_method_ret *ret,
876 struct wpabuf **resp)
877 {
878 struct wpabuf *msg;
879 u8 *buf, *pos, *challenge;
880 const u8 *identity, *password;
881 size_t identity_len, password_len;
882
883 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
884
885 identity = eap_get_config_identity(sm, &identity_len);
886 password = eap_get_config_password(sm, &password_len);
887 if (identity == NULL || password == NULL)
888 return -1;
889
890 msg = wpabuf_alloc(identity_len + 1000);
891 if (msg == NULL) {
892 wpa_printf(MSG_ERROR,
893 "EAP-TTLS/CHAP: Failed to allocate memory");
894 return -1;
895 }
896 pos = buf = wpabuf_mhead(msg);
897
898 /* User-Name */
899 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
900 identity, identity_len);
901
902 /* CHAP-Challenge */
903 challenge = eap_ttls_implicit_challenge(
904 sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
905 if (challenge == NULL) {
906 wpabuf_free(msg);
907 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
908 "implicit challenge");
909 return -1;
910 }
911
912 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
913 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
914
915 /* CHAP-Password */
916 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
917 1 + EAP_TTLS_CHAP_PASSWORD_LEN);
918 data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
919 *pos++ = data->ident;
920
921 /* MD5(Ident + Password + Challenge) */
922 chap_md5(data->ident, password, password_len, challenge,
923 EAP_TTLS_CHAP_CHALLENGE_LEN, pos);
924
925 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
926 identity, identity_len);
927 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
928 password, password_len);
929 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
930 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
931 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
932 pos, EAP_TTLS_CHAP_PASSWORD_LEN);
933 pos += EAP_TTLS_CHAP_PASSWORD_LEN;
934 os_free(challenge);
935 AVP_PAD(buf, pos);
936
937 wpabuf_put(msg, pos - buf);
938 *resp = msg;
939
940 if (data->ttls_version > 0) {
941 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
942 * so do not allow connection to be terminated yet. */
943 ret->methodState = METHOD_CONT;
944 ret->decision = DECISION_COND_SUCC;
945 } else {
946 /* EAP-TTLS/CHAP does not provide tunneled success
947 * notification, so assume that Phase2 succeeds. */
948 ret->methodState = METHOD_DONE;
949 ret->decision = DECISION_COND_SUCC;
950 }
951
952 return 0;
953 }
954
955
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)956 static int eap_ttls_phase2_request(struct eap_sm *sm,
957 struct eap_ttls_data *data,
958 struct eap_method_ret *ret,
959 struct eap_hdr *hdr,
960 struct wpabuf **resp)
961 {
962 int res = 0;
963 size_t len;
964 enum phase2_types phase2_type = data->phase2_type;
965
966 #ifdef EAP_TNC
967 if (data->tnc_started) {
968 wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC");
969 phase2_type = EAP_TTLS_PHASE2_EAP;
970 }
971 #endif /* EAP_TNC */
972
973 if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
974 phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
975 phase2_type == EAP_TTLS_PHASE2_PAP ||
976 phase2_type == EAP_TTLS_PHASE2_CHAP) {
977 if (eap_get_config_identity(sm, &len) == NULL) {
978 wpa_printf(MSG_INFO,
979 "EAP-TTLS: Identity not configured");
980 eap_sm_request_identity(sm);
981 if (eap_get_config_password(sm, &len) == NULL)
982 eap_sm_request_password(sm);
983 return 0;
984 }
985
986 if (eap_get_config_password(sm, &len) == NULL) {
987 wpa_printf(MSG_INFO,
988 "EAP-TTLS: Password not configured");
989 eap_sm_request_password(sm);
990 return 0;
991 }
992 }
993
994 switch (phase2_type) {
995 case EAP_TTLS_PHASE2_EAP:
996 res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp);
997 break;
998 case EAP_TTLS_PHASE2_MSCHAPV2:
999 res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp);
1000 break;
1001 case EAP_TTLS_PHASE2_MSCHAP:
1002 res = eap_ttls_phase2_request_mschap(sm, data, ret, resp);
1003 break;
1004 case EAP_TTLS_PHASE2_PAP:
1005 res = eap_ttls_phase2_request_pap(sm, data, ret, resp);
1006 break;
1007 case EAP_TTLS_PHASE2_CHAP:
1008 res = eap_ttls_phase2_request_chap(sm, data, ret, resp);
1009 break;
1010 default:
1011 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
1012 res = -1;
1013 break;
1014 }
1015
1016 if (res < 0) {
1017 ret->methodState = METHOD_DONE;
1018 ret->decision = DECISION_FAIL;
1019 }
1020
1021 return res;
1022 }
1023
1024
1025 #if EAP_TTLS_VERSION > 0
eap_ttls_build_phase_finished(struct eap_sm * sm,struct eap_ttls_data * data,int id,int final)1026 static struct wpabuf * eap_ttls_build_phase_finished(
1027 struct eap_sm *sm, struct eap_ttls_data *data, int id, int final)
1028 {
1029 int len;
1030 struct wpabuf *req;
1031 u8 *pos;
1032 const int max_len = 300;
1033
1034 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1 + max_len,
1035 EAP_CODE_RESPONSE, id);
1036 if (req == NULL)
1037 return NULL;
1038
1039 wpabuf_put_u8(req, data->ttls_version);
1040
1041 pos = wpabuf_put(req, 0);
1042 len = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
1043 data->ssl.conn,
1044 final, pos, max_len);
1045 if (len < 0) {
1046 wpabuf_free(req);
1047 return NULL;
1048 }
1049 wpabuf_put(req, len);
1050 eap_update_len(req);
1051
1052 return req;
1053 }
1054 #endif /* EAP_TTLS_VERSION */
1055
1056
1057 struct ttls_parse_avp {
1058 u8 *mschapv2;
1059 u8 *eapdata;
1060 size_t eap_len;
1061 int mschapv2_error;
1062 };
1063
1064
eap_ttls_parse_attr_eap(const u8 * dpos,size_t dlen,struct ttls_parse_avp * parse)1065 static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen,
1066 struct ttls_parse_avp *parse)
1067 {
1068 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
1069 if (parse->eapdata == NULL) {
1070 parse->eapdata = os_malloc(dlen);
1071 if (parse->eapdata == NULL) {
1072 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
1073 "memory for Phase 2 EAP data");
1074 return -1;
1075 }
1076 os_memcpy(parse->eapdata, dpos, dlen);
1077 parse->eap_len = dlen;
1078 } else {
1079 u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen);
1080 if (neweap == NULL) {
1081 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
1082 "memory for Phase 2 EAP data");
1083 return -1;
1084 }
1085 os_memcpy(neweap + parse->eap_len, dpos, dlen);
1086 parse->eapdata = neweap;
1087 parse->eap_len += dlen;
1088 }
1089
1090 return 0;
1091 }
1092
1093
eap_ttls_parse_avp(u8 * pos,size_t left,struct ttls_parse_avp * parse)1094 static int eap_ttls_parse_avp(u8 *pos, size_t left,
1095 struct ttls_parse_avp *parse)
1096 {
1097 struct ttls_avp *avp;
1098 u32 avp_code, avp_length, vendor_id = 0;
1099 u8 avp_flags, *dpos;
1100 size_t dlen;
1101
1102 avp = (struct ttls_avp *) pos;
1103 avp_code = be_to_host32(avp->avp_code);
1104 avp_length = be_to_host32(avp->avp_length);
1105 avp_flags = (avp_length >> 24) & 0xff;
1106 avp_length &= 0xffffff;
1107 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
1108 "length=%d", (int) avp_code, avp_flags,
1109 (int) avp_length);
1110
1111 if (avp_length > left) {
1112 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
1113 "(len=%d, left=%lu) - dropped",
1114 (int) avp_length, (unsigned long) left);
1115 return -1;
1116 }
1117
1118 if (avp_length < sizeof(*avp)) {
1119 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d",
1120 avp_length);
1121 return -1;
1122 }
1123
1124 dpos = (u8 *) (avp + 1);
1125 dlen = avp_length - sizeof(*avp);
1126 if (avp_flags & AVP_FLAGS_VENDOR) {
1127 if (dlen < 4) {
1128 wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP "
1129 "underflow");
1130 return -1;
1131 }
1132 vendor_id = WPA_GET_BE32(dpos);
1133 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
1134 (int) vendor_id);
1135 dpos += 4;
1136 dlen -= 4;
1137 }
1138
1139 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
1140
1141 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
1142 if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0)
1143 return -1;
1144 } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
1145 /* This is an optional message that can be displayed to
1146 * the user. */
1147 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message",
1148 dpos, dlen);
1149 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
1150 avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
1151 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success",
1152 dpos, dlen);
1153 if (dlen != 43) {
1154 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
1155 "MS-CHAP2-Success length "
1156 "(len=%lu, expected 43)",
1157 (unsigned long) dlen);
1158 return -1;
1159 }
1160 parse->mschapv2 = dpos;
1161 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
1162 avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
1163 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error",
1164 dpos, dlen);
1165 parse->mschapv2_error = 1;
1166 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
1167 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP "
1168 "code %d vendor_id %d - dropped",
1169 (int) avp_code, (int) vendor_id);
1170 return -1;
1171 } else {
1172 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP "
1173 "code %d vendor_id %d",
1174 (int) avp_code, (int) vendor_id);
1175 }
1176
1177 return avp_length;
1178 }
1179
1180
eap_ttls_parse_avps(struct wpabuf * in_decrypted,struct ttls_parse_avp * parse)1181 static int eap_ttls_parse_avps(struct wpabuf *in_decrypted,
1182 struct ttls_parse_avp *parse)
1183 {
1184 u8 *pos;
1185 size_t left, pad;
1186 int avp_length;
1187
1188 pos = wpabuf_mhead(in_decrypted);
1189 left = wpabuf_len(in_decrypted);
1190 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left);
1191 if (left < sizeof(struct ttls_avp)) {
1192 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
1193 " len=%lu expected %lu or more - dropped",
1194 (unsigned long) left,
1195 (unsigned long) sizeof(struct ttls_avp));
1196 return -1;
1197 }
1198
1199 /* Parse AVPs */
1200 os_memset(parse, 0, sizeof(*parse));
1201
1202 while (left > 0) {
1203 avp_length = eap_ttls_parse_avp(pos, left, parse);
1204 if (avp_length < 0)
1205 return -1;
1206
1207 pad = (4 - (avp_length & 3)) & 3;
1208 pos += avp_length + pad;
1209 if (left < avp_length + pad)
1210 left = 0;
1211 else
1212 left -= avp_length + pad;
1213 }
1214
1215 return 0;
1216 }
1217
1218
eap_ttls_fake_identity_request(void)1219 static u8 * eap_ttls_fake_identity_request(void)
1220 {
1221 struct eap_hdr *hdr;
1222 u8 *buf;
1223
1224 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
1225 "Phase 2 - use fake EAP-Request Identity");
1226 buf = os_malloc(sizeof(*hdr) + 1);
1227 if (buf == NULL) {
1228 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
1229 "memory for fake EAP-Identity Request");
1230 return NULL;
1231 }
1232
1233 hdr = (struct eap_hdr *) buf;
1234 hdr->code = EAP_CODE_REQUEST;
1235 hdr->identifier = 0;
1236 hdr->length = host_to_be16(sizeof(*hdr) + 1);
1237 buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
1238
1239 return buf;
1240 }
1241
1242
eap_ttls_encrypt_response(struct eap_sm * sm,struct eap_ttls_data * data,struct wpabuf * resp,u8 identifier,struct wpabuf ** out_data)1243 static int eap_ttls_encrypt_response(struct eap_sm *sm,
1244 struct eap_ttls_data *data,
1245 struct wpabuf *resp, u8 identifier,
1246 struct wpabuf **out_data)
1247 {
1248 if (resp == NULL)
1249 return 0;
1250
1251 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
1252 resp);
1253 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1254 data->ttls_version, identifier,
1255 resp, out_data)) {
1256 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 "
1257 "frame");
1258 return -1;
1259 }
1260 wpabuf_free(resp);
1261
1262 return 0;
1263 }
1264
1265
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)1266 static int eap_ttls_process_phase2_eap(struct eap_sm *sm,
1267 struct eap_ttls_data *data,
1268 struct eap_method_ret *ret,
1269 struct ttls_parse_avp *parse,
1270 struct wpabuf **resp)
1271 {
1272 struct eap_hdr *hdr;
1273 size_t len;
1274
1275 if (parse->eapdata == NULL) {
1276 wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the "
1277 "packet - dropped");
1278 return -1;
1279 }
1280
1281 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1282 parse->eapdata, parse->eap_len);
1283 hdr = (struct eap_hdr *) parse->eapdata;
1284
1285 if (parse->eap_len < sizeof(*hdr)) {
1286 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP "
1287 "frame (len=%lu, expected %lu or more) - dropped",
1288 (unsigned long) parse->eap_len,
1289 (unsigned long) sizeof(*hdr));
1290 return -1;
1291 }
1292 len = be_to_host16(hdr->length);
1293 if (len > parse->eap_len) {
1294 wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 "
1295 "EAP frame (EAP hdr len=%lu, EAP data len in "
1296 "AVP=%lu)",
1297 (unsigned long) len,
1298 (unsigned long) parse->eap_len);
1299 return -1;
1300 }
1301 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1302 "identifier=%d length=%lu",
1303 hdr->code, hdr->identifier, (unsigned long) len);
1304 switch (hdr->code) {
1305 case EAP_CODE_REQUEST:
1306 if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) {
1307 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1308 "processing failed");
1309 return -1;
1310 }
1311 break;
1312 default:
1313 wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1314 "Phase 2 EAP header", hdr->code);
1315 return -1;
1316 }
1317
1318 return 0;
1319 }
1320
1321
eap_ttls_process_phase2_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,struct ttls_parse_avp * parse)1322 static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
1323 struct eap_ttls_data *data,
1324 struct eap_method_ret *ret,
1325 struct ttls_parse_avp *parse)
1326 {
1327 if (parse->mschapv2_error) {
1328 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1329 "MS-CHAP-Error - failed");
1330 ret->methodState = METHOD_DONE;
1331 ret->decision = DECISION_FAIL;
1332 /* Reply with empty data to ACK error */
1333 return 1;
1334 }
1335
1336 if (parse->mschapv2 == NULL) {
1337 #ifdef EAP_TNC
1338 if (data->phase2_success && parse->eapdata) {
1339 /*
1340 * Allow EAP-TNC to be started after successfully
1341 * completed MSCHAPV2.
1342 */
1343 return 1;
1344 }
1345 #endif /* EAP_TNC */
1346 wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP "
1347 "received for Phase2 MSCHAPV2");
1348 return -1;
1349 }
1350 if (parse->mschapv2[0] != data->ident) {
1351 wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 "
1352 "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)",
1353 parse->mschapv2[0], data->ident);
1354 return -1;
1355 }
1356 if (!data->auth_response_valid ||
1357 mschapv2_verify_auth_response(data->auth_response,
1358 parse->mschapv2 + 1, 42)) {
1359 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator "
1360 "response in Phase 2 MSCHAPV2 success request");
1361 return -1;
1362 }
1363
1364 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1365 "authentication succeeded");
1366 if (data->ttls_version > 0) {
1367 /*
1368 * EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report
1369 * success, so do not allow connection to be terminated
1370 * yet.
1371 */
1372 ret->methodState = METHOD_CONT;
1373 ret->decision = DECISION_COND_SUCC;
1374 } else {
1375 ret->methodState = METHOD_DONE;
1376 ret->decision = DECISION_UNCOND_SUCC;
1377 data->phase2_success = 1;
1378 }
1379
1380 /*
1381 * Reply with empty data; authentication server will reply
1382 * with EAP-Success after this.
1383 */
1384 return 1;
1385 }
1386
1387
1388 #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)1389 static int eap_ttls_process_tnc_start(struct eap_sm *sm,
1390 struct eap_ttls_data *data,
1391 struct eap_method_ret *ret,
1392 struct ttls_parse_avp *parse,
1393 struct wpabuf **resp)
1394 {
1395 /* TNC uses inner EAP method after non-EAP TTLS phase 2. */
1396 if (parse->eapdata == NULL) {
1397 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1398 "unexpected tunneled data (no EAP)");
1399 return -1;
1400 }
1401
1402 if (!data->ready_for_tnc) {
1403 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1404 "EAP after non-EAP, but not ready for TNC");
1405 return -1;
1406 }
1407
1408 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
1409 "non-EAP method");
1410 data->tnc_started = 1;
1411
1412 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0)
1413 return -1;
1414
1415 return 0;
1416 }
1417 #endif /* EAP_TNC */
1418
1419
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)1420 static int eap_ttls_process_decrypted(struct eap_sm *sm,
1421 struct eap_ttls_data *data,
1422 struct eap_method_ret *ret,
1423 u8 identifier,
1424 struct ttls_parse_avp *parse,
1425 struct wpabuf *in_decrypted,
1426 struct wpabuf **out_data)
1427 {
1428 struct wpabuf *resp = NULL;
1429 struct eap_peer_config *config = eap_get_config(sm);
1430 int res;
1431 enum phase2_types phase2_type = data->phase2_type;
1432
1433 #ifdef EAP_TNC
1434 if (data->tnc_started)
1435 phase2_type = EAP_TTLS_PHASE2_EAP;
1436 #endif /* EAP_TNC */
1437
1438 switch (phase2_type) {
1439 case EAP_TTLS_PHASE2_EAP:
1440 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) <
1441 0)
1442 return -1;
1443 break;
1444 case EAP_TTLS_PHASE2_MSCHAPV2:
1445 res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse);
1446 #ifdef EAP_TNC
1447 if (res == 1 && parse->eapdata && data->phase2_success) {
1448 /*
1449 * TNC may be required as the next
1450 * authentication method within the tunnel.
1451 */
1452 ret->methodState = METHOD_MAY_CONT;
1453 data->ready_for_tnc = 1;
1454 if (eap_ttls_process_tnc_start(sm, data, ret, parse,
1455 &resp) == 0)
1456 break;
1457 }
1458 #endif /* EAP_TNC */
1459 return res;
1460 case EAP_TTLS_PHASE2_MSCHAP:
1461 case EAP_TTLS_PHASE2_PAP:
1462 case EAP_TTLS_PHASE2_CHAP:
1463 #ifdef EAP_TNC
1464 if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) <
1465 0)
1466 return -1;
1467 break;
1468 #else /* EAP_TNC */
1469 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1470 * requests to the supplicant */
1471 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1472 "tunneled data");
1473 return -1;
1474 #endif /* EAP_TNC */
1475 }
1476
1477 if (resp) {
1478 if (eap_ttls_encrypt_response(sm, data, resp, identifier,
1479 out_data) < 0)
1480 return -1;
1481 } else if (config->pending_req_identity ||
1482 config->pending_req_password ||
1483 config->pending_req_otp ||
1484 config->pending_req_new_password) {
1485 wpabuf_free(data->pending_phase2_req);
1486 data->pending_phase2_req = wpabuf_dup(in_decrypted);
1487 }
1488
1489 return 0;
1490 }
1491
1492
1493 #if EAP_TTLS_VERSION > 0
eap_ttls_final_phase_finished(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,struct wpabuf ** out_data)1494 static void eap_ttls_final_phase_finished(struct eap_sm *sm,
1495 struct eap_ttls_data *data,
1496 struct eap_method_ret *ret,
1497 u8 identifier,
1498 struct wpabuf **out_data)
1499 {
1500 wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received");
1501 wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication succeeded");
1502 ret->methodState = METHOD_DONE;
1503 ret->decision = DECISION_UNCOND_SUCC;
1504 data->phase2_success = 1;
1505 *out_data = eap_ttls_build_phase_finished(sm, data, identifier, 1);
1506 eap_ttls_v1_derive_key(sm, data);
1507 }
1508 #endif /* EAP_TTLS_VERSION */
1509
1510
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)1511 static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
1512 struct eap_ttls_data *data,
1513 struct eap_method_ret *ret,
1514 u8 identifier,
1515 struct wpabuf **out_data)
1516 {
1517 int retval = 0;
1518 struct eap_hdr *hdr;
1519 struct wpabuf *resp;
1520
1521 hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
1522 if (hdr == NULL) {
1523 ret->methodState = METHOD_DONE;
1524 ret->decision = DECISION_FAIL;
1525 return -1;
1526 }
1527
1528 resp = NULL;
1529 if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
1530 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1531 "processing failed");
1532 retval = -1;
1533 } else {
1534 retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
1535 out_data);
1536 }
1537
1538 os_free(hdr);
1539
1540 if (retval < 0) {
1541 ret->methodState = METHOD_DONE;
1542 ret->decision = DECISION_FAIL;
1543 }
1544
1545 return retval;
1546 }
1547
1548
eap_ttls_phase2_start(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,struct wpabuf ** out_data)1549 static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
1550 struct eap_method_ret *ret, u8 identifier,
1551 struct wpabuf **out_data)
1552 {
1553 data->phase2_start = 0;
1554
1555 /*
1556 * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
1557 * if TLS part was indeed resuming a previous session. Most
1558 * Authentication Servers terminate EAP-TTLS before reaching this
1559 * point, but some do not. Make wpa_supplicant stop phase 2 here, if
1560 * needed.
1561 */
1562 if (data->reauth &&
1563 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
1564 wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
1565 "skip phase 2");
1566 *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
1567 data->ttls_version);
1568 ret->methodState = METHOD_DONE;
1569 ret->decision = DECISION_UNCOND_SUCC;
1570 data->phase2_success = 1;
1571 return 0;
1572 }
1573
1574 return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
1575 out_data);
1576 }
1577
1578
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)1579 static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
1580 struct eap_method_ret *ret, u8 identifier,
1581 const struct wpabuf *in_data,
1582 struct wpabuf **out_data)
1583 {
1584 struct wpabuf *in_decrypted = NULL;
1585 int retval = 0;
1586 struct ttls_parse_avp parse;
1587
1588 os_memset(&parse, 0, sizeof(parse));
1589
1590 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1591 " Phase 2",
1592 in_data ? (unsigned long) wpabuf_len(in_data) : 0);
1593
1594 if (data->pending_phase2_req) {
1595 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
1596 "skip decryption and use old data");
1597 /* Clear TLS reassembly state. */
1598 eap_peer_tls_reset_input(&data->ssl);
1599
1600 in_decrypted = data->pending_phase2_req;
1601 data->pending_phase2_req = NULL;
1602 if (wpabuf_len(in_decrypted) == 0) {
1603 wpabuf_free(in_decrypted);
1604 return eap_ttls_implicit_identity_request(
1605 sm, data, ret, identifier, out_data);
1606 }
1607 goto continue_req;
1608 }
1609
1610 if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
1611 data->phase2_start) {
1612 return eap_ttls_phase2_start(sm, data, ret, identifier,
1613 out_data);
1614 }
1615
1616 if (in_data == NULL || wpabuf_len(in_data) == 0) {
1617 /* Received TLS ACK - requesting more fragments */
1618 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1619 data->ttls_version,
1620 identifier, NULL, out_data);
1621 }
1622
1623 retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1624 if (retval)
1625 goto done;
1626
1627 #if EAP_TTLS_VERSION > 0
1628 if (data->ttls_version > 0 &&
1629 (in_decrypted == NULL || wpabuf_len(in_decrypted) == 0) &&
1630 tls_connection_ia_final_phase_finished(sm->ssl_ctx,
1631 data->ssl.conn)) {
1632 eap_ttls_final_phase_finished(sm, data, ret, identifier,
1633 out_data);
1634 goto done;
1635 }
1636 #endif /* EAP_TTLS_VERSION */
1637
1638 continue_req:
1639 data->phase2_start = 0;
1640
1641 if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
1642 retval = -1;
1643 goto done;
1644 }
1645
1646 retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
1647 &parse, in_decrypted, out_data);
1648
1649 done:
1650 wpabuf_free(in_decrypted);
1651 os_free(parse.eapdata);
1652
1653 if (retval < 0) {
1654 ret->methodState = METHOD_DONE;
1655 ret->decision = DECISION_FAIL;
1656 }
1657
1658 return retval;
1659 }
1660
1661
eap_ttls_process_start(struct eap_sm * sm,struct eap_ttls_data * data,u8 flags,struct eap_method_ret * ret)1662 static int eap_ttls_process_start(struct eap_sm *sm,
1663 struct eap_ttls_data *data, u8 flags,
1664 struct eap_method_ret *ret)
1665 {
1666 struct eap_peer_config *config = eap_get_config(sm);
1667
1668 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own ver=%d)",
1669 flags & EAP_PEAP_VERSION_MASK, data->ttls_version);
1670 #if EAP_TTLS_VERSION > 0
1671 if ((flags & EAP_PEAP_VERSION_MASK) < data->ttls_version)
1672 data->ttls_version = flags & EAP_PEAP_VERSION_MASK;
1673 if (data->force_ttls_version >= 0 &&
1674 data->force_ttls_version != data->ttls_version) {
1675 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to select "
1676 "forced TTLS version %d",
1677 data->force_ttls_version);
1678 ret->methodState = METHOD_DONE;
1679 ret->decision = DECISION_FAIL;
1680 ret->allowNotifications = FALSE;
1681 return -1;
1682 }
1683 wpa_printf(MSG_DEBUG, "EAP-TTLS: Using TTLS version %d",
1684 data->ttls_version);
1685
1686 if (data->ttls_version > 0)
1687 data->ssl.tls_ia = 1;
1688 #endif /* EAP_TTLS_VERSION */
1689 if (!data->ssl_initialized &&
1690 eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
1691 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
1692 return -1;
1693 }
1694 data->ssl_initialized = 1;
1695
1696 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");
1697
1698 return 0;
1699 }
1700
1701
eap_ttls_process_handshake(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret,u8 identifier,const u8 * in_data,size_t in_len,struct wpabuf ** out_data)1702 static int eap_ttls_process_handshake(struct eap_sm *sm,
1703 struct eap_ttls_data *data,
1704 struct eap_method_ret *ret,
1705 u8 identifier,
1706 const u8 *in_data, size_t in_len,
1707 struct wpabuf **out_data)
1708 {
1709 int res;
1710
1711 res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
1712 data->ttls_version, identifier,
1713 in_data, in_len, out_data);
1714
1715 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1716 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
1717 "Phase 2");
1718 if (data->resuming) {
1719 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
1720 "skip Phase 2");
1721 ret->decision = DECISION_COND_SUCC;
1722 ret->methodState = METHOD_MAY_CONT;
1723 }
1724 data->phase2_start = 1;
1725 if (data->ttls_version == 0)
1726 eap_ttls_v0_derive_key(sm, data);
1727
1728 if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
1729 if (eap_ttls_decrypt(sm, data, ret, identifier,
1730 NULL, out_data)) {
1731 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1732 "failed to process early "
1733 "start for Phase 2");
1734 }
1735 res = 0;
1736 }
1737 data->resuming = 0;
1738 }
1739
1740 if (res == 2) {
1741 struct wpabuf msg;
1742 /*
1743 * Application data included in the handshake message.
1744 */
1745 wpabuf_free(data->pending_phase2_req);
1746 data->pending_phase2_req = *out_data;
1747 *out_data = NULL;
1748 wpabuf_set(&msg, in_data, in_len);
1749 res = eap_ttls_decrypt(sm, data, ret, identifier, &msg,
1750 out_data);
1751 }
1752
1753 return res;
1754 }
1755
1756
eap_ttls_check_auth_status(struct eap_sm * sm,struct eap_ttls_data * data,struct eap_method_ret * ret)1757 static void eap_ttls_check_auth_status(struct eap_sm *sm,
1758 struct eap_ttls_data *data,
1759 struct eap_method_ret *ret)
1760 {
1761 if (data->ttls_version == 0 && ret->methodState == METHOD_DONE) {
1762 ret->allowNotifications = FALSE;
1763 if (ret->decision == DECISION_UNCOND_SUCC ||
1764 ret->decision == DECISION_COND_SUCC) {
1765 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1766 "completed successfully");
1767 data->phase2_success = 1;
1768 #ifdef EAP_TNC
1769 if (!data->ready_for_tnc && !data->tnc_started) {
1770 /*
1771 * TNC may be required as the next
1772 * authentication method within the tunnel.
1773 */
1774 ret->methodState = METHOD_MAY_CONT;
1775 data->ready_for_tnc = 1;
1776 }
1777 #endif /* EAP_TNC */
1778 }
1779 } else if (data->ttls_version == 0 &&
1780 ret->methodState == METHOD_MAY_CONT &&
1781 (ret->decision == DECISION_UNCOND_SUCC ||
1782 ret->decision == DECISION_COND_SUCC)) {
1783 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1784 "completed successfully (MAY_CONT)");
1785 data->phase2_success = 1;
1786 }
1787 }
1788
1789
eap_ttls_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1790 static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
1791 struct eap_method_ret *ret,
1792 const struct wpabuf *reqData)
1793 {
1794 size_t left;
1795 int res;
1796 u8 flags, id;
1797 struct wpabuf *resp;
1798 const u8 *pos;
1799 struct eap_ttls_data *data = priv;
1800
1801 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
1802 reqData, &left, &flags);
1803 if (pos == NULL)
1804 return NULL;
1805 id = eap_get_id(reqData);
1806
1807 if (flags & EAP_TLS_FLAGS_START) {
1808 if (eap_ttls_process_start(sm, data, flags, ret) < 0)
1809 return NULL;
1810
1811 /* RFC 5281, Ch. 9.2:
1812 * "This packet MAY contain additional information in the form
1813 * of AVPs, which may provide useful hints to the client"
1814 * For now, ignore any potential extra data.
1815 */
1816 left = 0;
1817 } else if (!data->ssl_initialized) {
1818 wpa_printf(MSG_DEBUG, "EAP-TTLS: First message did not "
1819 "include Start flag");
1820 ret->methodState = METHOD_DONE;
1821 ret->decision = DECISION_FAIL;
1822 ret->allowNotifications = FALSE;
1823 return NULL;
1824 }
1825
1826 resp = NULL;
1827 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1828 !data->resuming) {
1829 struct wpabuf msg;
1830 wpabuf_set(&msg, pos, left);
1831 res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
1832 } else {
1833 res = eap_ttls_process_handshake(sm, data, ret, id,
1834 pos, left, &resp);
1835 }
1836
1837 eap_ttls_check_auth_status(sm, data, ret);
1838
1839 /* FIX: what about res == -1? Could just move all error processing into
1840 * the other functions and get rid of this res==1 case here. */
1841 if (res == 1) {
1842 wpabuf_free(resp);
1843 return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
1844 data->ttls_version);
1845 }
1846 return resp;
1847 }
1848
1849
eap_ttls_has_reauth_data(struct eap_sm * sm,void * priv)1850 static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1851 {
1852 struct eap_ttls_data *data = priv;
1853 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1854 data->phase2_success;
1855 }
1856
1857
eap_ttls_deinit_for_reauth(struct eap_sm * sm,void * priv)1858 static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1859 {
1860 struct eap_ttls_data *data = priv;
1861 wpabuf_free(data->pending_phase2_req);
1862 data->pending_phase2_req = NULL;
1863 #ifdef EAP_TNC
1864 data->ready_for_tnc = 0;
1865 data->tnc_started = 0;
1866 #endif /* EAP_TNC */
1867 }
1868
1869
eap_ttls_init_for_reauth(struct eap_sm * sm,void * priv)1870 static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1871 {
1872 struct eap_ttls_data *data = priv;
1873 os_free(data->key_data);
1874 data->key_data = NULL;
1875 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1876 os_free(data);
1877 return NULL;
1878 }
1879 if (data->phase2_priv && data->phase2_method &&
1880 data->phase2_method->init_for_reauth)
1881 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1882 data->phase2_start = 0;
1883 data->phase2_success = 0;
1884 data->resuming = 1;
1885 data->reauth = 1;
1886 return priv;
1887 }
1888
1889
eap_ttls_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1890 static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1891 size_t buflen, int verbose)
1892 {
1893 struct eap_ttls_data *data = priv;
1894 int len, ret;
1895
1896 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1897 ret = os_snprintf(buf + len, buflen - len,
1898 "EAP-TTLSv%d Phase2 method=",
1899 data->ttls_version);
1900 if (ret < 0 || (size_t) ret >= buflen - len)
1901 return len;
1902 len += ret;
1903 switch (data->phase2_type) {
1904 case EAP_TTLS_PHASE2_EAP:
1905 ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
1906 data->phase2_method ?
1907 data->phase2_method->name : "?");
1908 break;
1909 case EAP_TTLS_PHASE2_MSCHAPV2:
1910 ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
1911 break;
1912 case EAP_TTLS_PHASE2_MSCHAP:
1913 ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
1914 break;
1915 case EAP_TTLS_PHASE2_PAP:
1916 ret = os_snprintf(buf + len, buflen - len, "PAP\n");
1917 break;
1918 case EAP_TTLS_PHASE2_CHAP:
1919 ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
1920 break;
1921 default:
1922 ret = 0;
1923 break;
1924 }
1925 if (ret < 0 || (size_t) ret >= buflen - len)
1926 return len;
1927 len += ret;
1928
1929 return len;
1930 }
1931
1932
eap_ttls_isKeyAvailable(struct eap_sm * sm,void * priv)1933 static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1934 {
1935 struct eap_ttls_data *data = priv;
1936 return data->key_data != NULL && data->phase2_success;
1937 }
1938
1939
eap_ttls_getKey(struct eap_sm * sm,void * priv,size_t * len)1940 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1941 {
1942 struct eap_ttls_data *data = priv;
1943 u8 *key;
1944
1945 if (data->key_data == NULL || !data->phase2_success)
1946 return NULL;
1947
1948 key = os_malloc(EAP_TLS_KEY_LEN);
1949 if (key == NULL)
1950 return NULL;
1951
1952 *len = EAP_TLS_KEY_LEN;
1953 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1954
1955 return key;
1956 }
1957
1958
eap_peer_ttls_register(void)1959 int eap_peer_ttls_register(void)
1960 {
1961 struct eap_method *eap;
1962 int ret;
1963
1964 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1965 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1966 if (eap == NULL)
1967 return -1;
1968
1969 eap->init = eap_ttls_init;
1970 eap->deinit = eap_ttls_deinit;
1971 eap->process = eap_ttls_process;
1972 eap->isKeyAvailable = eap_ttls_isKeyAvailable;
1973 eap->getKey = eap_ttls_getKey;
1974 eap->get_status = eap_ttls_get_status;
1975 eap->has_reauth_data = eap_ttls_has_reauth_data;
1976 eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
1977 eap->init_for_reauth = eap_ttls_init_for_reauth;
1978
1979 ret = eap_peer_method_register(eap);
1980 if (ret)
1981 eap_peer_method_free(eap);
1982 return ret;
1983 }
1984