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6fc6879b 1/*
a9141cff 2 * EAP peer method: EAP-TTLS (RFC 5281)
3c108b75 3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
6fc6879b 4 *
0f3d578e
JM		 5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
6fc6879b
JM		 7 */
8
9#include "includes.h"
10
11#include "common.h"
03da66bd 12#include "crypto/ms_funcs.h"
496c5d98 13#include "crypto/sha1.h"
03da66bd 14#include "crypto/tls.h"
6fc6879b 15#include "eap_common/chap.h"
6fc6879b 16#include "eap_common/eap_ttls.h"
03da66bd
JM		 17#include "mschapv2.h"
18#include "eap_i.h"
19#include "eap_tls_common.h"
20#include "eap_config.h"
6fc6879b
JM		 21
22
fd2f2d04 23#define EAP_TTLS_VERSION 0
6fc6879b
JM		 24
25
26static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
27
28
29struct eap_ttls_data {
30 struct eap_ssl_data ssl;
6fc6879b 31
fd2f2d04 32 int ttls_version;
6fc6879b
JM		 33
34 const struct eap_method *phase2_method;
35 void *phase2_priv;
36 int phase2_success;
37 int phase2_start;
0daa9f6a 38 EapDecision decision_succ;
6fc6879b
JM		 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;
950c5630
SL		 58 u8 *session_id;
59 size_t id_len;
6fc6879b
JM		 60
61 struct wpabuf *pending_phase2_req;
3c108b75 62 struct wpabuf *pending_resp;
6fc6879b
JM		 63
64#ifdef EAP_TNC
65 int ready_for_tnc;
66 int tnc_started;
67#endif /* EAP_TNC */
68};
69
70
71static 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);
f24e4886 75 int selected_non_eap;
6fc6879b
JM		 76 char *selected;
77
78 data = os_zalloc(sizeof(*data));
79 if (data == NULL)
80 return NULL;
81 data->ttls_version = EAP_TTLS_VERSION;
6fc6879b 82 selected = "EAP";
f24e4886 83 selected_non_eap = 0;
6fc6879b
JM		 84 data->phase2_type = EAP_TTLS_PHASE2_EAP;
85
f24e4886
PR		 86 /*
87 * Either one auth= type or one or more autheap= methods can be
88 * specified.
89 */
6fc6879b 90 if (config && config->phase2) {
f24e4886
PR		 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
6fc6879b 132 if (os_strstr(config->phase2, "autheap=")) {
f24e4886
PR		 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 }
6fc6879b
JM		 139 selected = "EAP";
140 data->phase2_type = EAP_TTLS_PHASE2_EAP;
6fc6879b
JM		 141 }
142 }
f24e4886 143
6fc6879b
JM		 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
c22075e1 159 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TTLS)) {
fd2f2d04
JM		 160 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
161 eap_ttls_deinit(sm, data);
162 return NULL;
6fc6879b 163 }
6fc6879b
JM		 164
165 return data;
166}
167
168
169static 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
f534ee08
JM		 180static void eap_ttls_free_key(struct eap_ttls_data *data)
181{
182 if (data->key_data) {
a7bec9e7 183 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
f534ee08
JM		 184 data->key_data = NULL;
185 }
186}
187
188
6fc6879b
JM		 189static 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);
fd2f2d04 196 eap_peer_tls_ssl_deinit(sm, &data->ssl);
f534ee08 197 eap_ttls_free_key(data);
950c5630 198 os_free(data->session_id);
6fc6879b 199 wpabuf_free(data->pending_phase2_req);
3c108b75 200 wpabuf_free(data->pending_resp);
6fc6879b
JM		 201 os_free(data);
202}
203
204
205static 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);
e9ed7d98
JM		 223 avp->avp_length = host_to_be32(((u32) flags << 24) |
224 (u32) (hdrlen + len));
6fc6879b
JM		 225
226 return avphdr + hdrlen;
227}
228
229
230static 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
243static 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_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_free(*resp);
262 wpabuf_put(msg, pos - avp);
263 *resp = msg;
264 return 0;
265}
266
267
6fc6879b
JM		 268static int eap_ttls_v0_derive_key(struct eap_sm *sm,
269 struct eap_ttls_data *data)
270{
f534ee08 271 eap_ttls_free_key(data);
6fc6879b
JM		 272 data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
273 "ttls keying material",
a7bec9e7
JM		 274 EAP_TLS_KEY_LEN +
275 EAP_EMSK_LEN);
6fc6879b
JM		 276 if (!data->key_data) {
277 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
278 return -1;
279 }
280
281 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
282 data->key_data, EAP_TLS_KEY_LEN);
a7bec9e7
JM		 283 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived EMSK",
284 data->key_data + EAP_TLS_KEY_LEN,
285 EAP_EMSK_LEN);
6fc6879b 286
950c5630
SL		 287 os_free(data->session_id);
288 data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
289 EAP_TYPE_TTLS,
290 &data->id_len);
291 if (data->session_id) {
292 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived Session-Id",
293 data->session_id, data->id_len);
294 } else {
295 wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive Session-Id");
296 }
297
6fc6879b
JM		 298 return 0;
299}
300
301
835c89a1 302#ifndef CONFIG_FIPS
6fc6879b
JM		 303static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
304 struct eap_ttls_data *data, size_t len)
305{
fd2f2d04 306 return eap_peer_tls_derive_key(sm, &data->ssl, "ttls challenge", len);
6fc6879b 307}
835c89a1 308#endif /* CONFIG_FIPS */
6fc6879b
JM		 309
310
311static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data,
312 u8 method)
313{
314 size_t i;
315 for (i = 0; i < data->num_phase2_eap_types; i++) {
316 if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF ||
317 data->phase2_eap_types[i].method != method)
318 continue;
319
320 data->phase2_eap_type.vendor =
321 data->phase2_eap_types[i].vendor;
322 data->phase2_eap_type.method =
323 data->phase2_eap_types[i].method;
324 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
325 "Phase 2 EAP vendor %d method %d",
326 data->phase2_eap_type.vendor,
327 data->phase2_eap_type.method);
328 break;
329 }
330}
331
332
333static int eap_ttls_phase2_eap_process(struct eap_sm *sm,
334 struct eap_ttls_data *data,
335 struct eap_method_ret *ret,
336 struct eap_hdr *hdr, size_t len,
337 struct wpabuf **resp)
338{
339 struct wpabuf msg;
340 struct eap_method_ret iret;
341
342 os_memset(&iret, 0, sizeof(iret));
343 wpabuf_set(&msg, hdr, len);
344 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
345 &msg);
346 if ((iret.methodState == METHOD_DONE ||
347 iret.methodState == METHOD_MAY_CONT) &&
348 (iret.decision == DECISION_UNCOND_SUCC ||
349 iret.decision == DECISION_COND_SUCC ||
350 iret.decision == DECISION_FAIL)) {
351 ret->methodState = iret.methodState;
352 ret->decision = iret.decision;
353 }
6fc6879b
JM		 354
355 return 0;
356}
357
358
359static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm,
360 struct eap_ttls_data *data,
361 struct eap_method_ret *ret,
362 struct eap_hdr *hdr, size_t len,
363 u8 method, struct wpabuf **resp)
364{
365#ifdef EAP_TNC
366 if (data->tnc_started && data->phase2_method &&
367 data->phase2_priv && method == EAP_TYPE_TNC &&
368 data->phase2_eap_type.method == EAP_TYPE_TNC)
369 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len,
370 resp);
371
372 if (data->ready_for_tnc && !data->tnc_started &&
373 method == EAP_TYPE_TNC) {
374 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
375 "EAP method");
376 data->tnc_started = 1;
377 }
378
379 if (data->tnc_started) {
380 if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF ||
381 data->phase2_eap_type.method == EAP_TYPE_TNC) {
382 wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP "
383 "type %d for TNC", method);
384 return -1;
385 }
386
387 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
388 data->phase2_eap_type.method = method;
389 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
390 "Phase 2 EAP vendor %d method %d (TNC)",
391 data->phase2_eap_type.vendor,
392 data->phase2_eap_type.method);
393
394 if (data->phase2_type == EAP_TTLS_PHASE2_EAP)
395 eap_ttls_phase2_eap_deinit(sm, data);
396 }
397#endif /* EAP_TNC */
398
399 if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
400 data->phase2_eap_type.method == EAP_TYPE_NONE)
401 eap_ttls_phase2_select_eap_method(data, method);
402
403 if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE)
404 {
405 if (eap_peer_tls_phase2_nak(data->phase2_eap_types,
406 data->num_phase2_eap_types,
407 hdr, resp))
408 return -1;
409 return 0;
410 }
411
412 if (data->phase2_priv == NULL) {
413 data->phase2_method = eap_peer_get_eap_method(
414 EAP_VENDOR_IETF, method);
415 if (data->phase2_method) {
416 sm->init_phase2 = 1;
6fc6879b
JM		 417 data->phase2_priv = data->phase2_method->init(sm);
418 sm->init_phase2 = 0;
6fc6879b
JM		 419 }
420 }
421 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
422 wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
423 "Phase 2 EAP method %d", method);
424 return -1;
425 }
426
427 return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp);
428}
429
430
431static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
432 struct eap_ttls_data *data,
433 struct eap_method_ret *ret,
434 struct eap_hdr *hdr,
435 struct wpabuf **resp)
436{
437 size_t len = be_to_host16(hdr->length);
438 u8 *pos;
439 struct eap_peer_config *config = eap_get_config(sm);
440
441 if (len <= sizeof(struct eap_hdr)) {
442 wpa_printf(MSG_INFO, "EAP-TTLS: too short "
443 "Phase 2 request (len=%lu)", (unsigned long) len);
444 return -1;
445 }
446 pos = (u8 *) (hdr + 1);
447 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
448 switch (*pos) {
449 case EAP_TYPE_IDENTITY:
450 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
451 break;
452 default:
453 if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len,
454 *pos, resp) < 0)
455 return -1;
456 break;
457 }
458
459 if (*resp == NULL &&
460 (config->pending_req_identity || config->pending_req_password ||
461 config->pending_req_otp)) {
462 return 0;
463 }
464
465 if (*resp == NULL)
466 return -1;
467
468 wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
469 *resp);
470 return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1);
471}
472
473
6fc6879b
JM		 474static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
475 struct eap_ttls_data *data,
476 struct eap_method_ret *ret,
477 struct wpabuf **resp)
478{
835c89a1
JM		 479#ifdef CONFIG_FIPS
480 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPV2 not supported in FIPS build");
481 return -1;
482#else /* CONFIG_FIPS */
37129688 483#ifdef EAP_MSCHAPv2
6fc6879b
JM		 484 struct wpabuf *msg;
485 u8 *buf, *pos, *challenge, *peer_challenge;
486 const u8 *identity, *password;
487 size_t identity_len, password_len;
488 int pwhash;
489
490 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
491
492 identity = eap_get_config_identity(sm, &identity_len);
493 password = eap_get_config_password2(sm, &password_len, &pwhash);
494 if (identity == NULL || password == NULL)
495 return -1;
496
497 msg = wpabuf_alloc(identity_len + 1000);
498 if (msg == NULL) {
499 wpa_printf(MSG_ERROR,
500 "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
501 return -1;
502 }
503 pos = buf = wpabuf_mhead(msg);
504
505 /* User-Name */
506 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
507 identity, identity_len);
508
509 /* MS-CHAP-Challenge */
510 challenge = eap_ttls_implicit_challenge(
30680e93 511 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
6fc6879b
JM		 512 if (challenge == NULL) {
513 wpabuf_free(msg);
514 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
515 "implicit challenge");
516 return -1;
517 }
6fc6879b
JM		 518
519 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
520 RADIUS_VENDOR_ID_MICROSOFT, 1,
521 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
522
523 /* MS-CHAP2-Response */
524 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
525 RADIUS_VENDOR_ID_MICROSOFT, 1,
526 EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
527 data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
528 *pos++ = data->ident;
529 *pos++ = 0; /* Flags */
e19467e1
JM		 530 if (os_get_random(pos, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN) < 0) {
531 os_free(challenge);
532 wpabuf_free(msg);
533 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to get "
534 "random data for peer challenge");
535 return -1;
536 }
537 peer_challenge = pos;
6fc6879b
JM		 538 pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
539 os_memset(pos, 0, 8); /* Reserved, must be zero */
540 pos += 8;
c5f6ad57
JM		 541 if (mschapv2_derive_response(identity, identity_len, password,
542 password_len, pwhash, challenge,
543 peer_challenge, pos, data->auth_response,
544 data->master_key)) {
e19467e1 545 os_free(challenge);
c5f6ad57
JM		 546 wpabuf_free(msg);
547 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
548 "response");
549 return -1;
550 }
6fc6879b
JM		 551 data->auth_response_valid = 1;
552
6fc6879b
JM		 553 pos += 24;
554 os_free(challenge);
555 AVP_PAD(buf, pos);
556
557 wpabuf_put(msg, pos - buf);
558 *resp = msg;
559
6fc6879b 560 return 0;
37129688
JM		 561#else /* EAP_MSCHAPv2 */
562 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
563 return -1;
564#endif /* EAP_MSCHAPv2 */
835c89a1 565#endif /* CONFIG_FIPS */
6fc6879b
JM		 566}
567
568
569static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
570 struct eap_ttls_data *data,
571 struct eap_method_ret *ret,
572 struct wpabuf **resp)
573{
835c89a1
JM		 574#ifdef CONFIG_FIPS
575 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAP not supported in FIPS build");
576 return -1;
577#else /* CONFIG_FIPS */
6fc6879b
JM		 578 struct wpabuf *msg;
579 u8 *buf, *pos, *challenge;
580 const u8 *identity, *password;
581 size_t identity_len, password_len;
582 int pwhash;
583
584 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
585
586 identity = eap_get_config_identity(sm, &identity_len);
587 password = eap_get_config_password2(sm, &password_len, &pwhash);
588 if (identity == NULL || password == NULL)
589 return -1;
590
591 msg = wpabuf_alloc(identity_len + 1000);
592 if (msg == NULL) {
593 wpa_printf(MSG_ERROR,
594 "EAP-TTLS/MSCHAP: Failed to allocate memory");
595 return -1;
596 }
597 pos = buf = wpabuf_mhead(msg);
598
599 /* User-Name */
600 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
601 identity, identity_len);
602
603 /* MS-CHAP-Challenge */
30680e93
JM		 604 challenge = eap_ttls_implicit_challenge(
605 sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
6fc6879b
JM		 606 if (challenge == NULL) {
607 wpabuf_free(msg);
608 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
609 "implicit challenge");
610 return -1;
611 }
612
613 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
614 RADIUS_VENDOR_ID_MICROSOFT, 1,
615 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
616
617 /* MS-CHAP-Response */
618 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
619 RADIUS_VENDOR_ID_MICROSOFT, 1,
620 EAP_TTLS_MSCHAP_RESPONSE_LEN);
621 data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
622 *pos++ = data->ident;
623 *pos++ = 1; /* Flags: Use NT style passwords */
624 os_memset(pos, 0, 24); /* LM-Response */
625 pos += 24;
626 if (pwhash) {
627 challenge_response(challenge, password, pos); /* NT-Response */
628 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
629 password, 16);
630 } else {
631 nt_challenge_response(challenge, password, password_len,
632 pos); /* NT-Response */
633 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
634 password, password_len);
635 }
636 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
637 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
638 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
639 pos += 24;
640 os_free(challenge);
641 AVP_PAD(buf, pos);
642
643 wpabuf_put(msg, pos - buf);
644 *resp = msg;
645
fd2f2d04
JM		 646 /* EAP-TTLS/MSCHAP does not provide tunneled success
647 * notification, so assume that Phase2 succeeds. */
648 ret->methodState = METHOD_DONE;
649 ret->decision = DECISION_COND_SUCC;
6fc6879b
JM		 650
651 return 0;
835c89a1 652#endif /* CONFIG_FIPS */
6fc6879b
JM		 653}
654
655
656static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
657 struct eap_ttls_data *data,
658 struct eap_method_ret *ret,
659 struct wpabuf **resp)
660{
661 struct wpabuf *msg;
662 u8 *buf, *pos;
663 size_t pad;
664 const u8 *identity, *password;
665 size_t identity_len, password_len;
666
667 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
668
669 identity = eap_get_config_identity(sm, &identity_len);
670 password = eap_get_config_password(sm, &password_len);
671 if (identity == NULL || password == NULL)
672 return -1;
673
674 msg = wpabuf_alloc(identity_len + password_len + 100);
675 if (msg == NULL) {
676 wpa_printf(MSG_ERROR,
677 "EAP-TTLS/PAP: Failed to allocate memory");
678 return -1;
679 }
680 pos = buf = wpabuf_mhead(msg);
681
682 /* User-Name */
683 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
684 identity, identity_len);
685
686 /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
687 * the data, so no separate encryption is used in the AVP itself.
688 * However, the password is padded to obfuscate its length. */
bab31499 689 pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15;
6fc6879b
JM		 690 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
691 password_len + pad);
692 os_memcpy(pos, password, password_len);
693 pos += password_len;
694 os_memset(pos, 0, pad);
695 pos += pad;
696 AVP_PAD(buf, pos);
697
698 wpabuf_put(msg, pos - buf);
699 *resp = msg;
700
fd2f2d04
JM		 701 /* EAP-TTLS/PAP does not provide tunneled success notification,
702 * so assume that Phase2 succeeds. */
703 ret->methodState = METHOD_DONE;
704 ret->decision = DECISION_COND_SUCC;
6fc6879b
JM		 705
706 return 0;
707}
708
709
710static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
711 struct eap_ttls_data *data,
712 struct eap_method_ret *ret,
713 struct wpabuf **resp)
714{
835c89a1
JM		 715#ifdef CONFIG_FIPS
716 wpa_printf(MSG_ERROR, "EAP-TTLS: CHAP not supported in FIPS build");
717 return -1;
718#else /* CONFIG_FIPS */
6fc6879b
JM		 719 struct wpabuf *msg;
720 u8 *buf, *pos, *challenge;
721 const u8 *identity, *password;
722 size_t identity_len, password_len;
723
724 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
725
726 identity = eap_get_config_identity(sm, &identity_len);
727 password = eap_get_config_password(sm, &password_len);
728 if (identity == NULL || password == NULL)
729 return -1;
730
731 msg = wpabuf_alloc(identity_len + 1000);
732 if (msg == NULL) {
733 wpa_printf(MSG_ERROR,
734 "EAP-TTLS/CHAP: Failed to allocate memory");
735 return -1;
736 }
737 pos = buf = wpabuf_mhead(msg);
738
739 /* User-Name */
740 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
741 identity, identity_len);
742
743 /* CHAP-Challenge */
30680e93
JM		 744 challenge = eap_ttls_implicit_challenge(
745 sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
6fc6879b
JM		 746 if (challenge == NULL) {
747 wpabuf_free(msg);
748 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
749 "implicit challenge");
750 return -1;
751 }
752
753 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
754 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
755
756 /* CHAP-Password */
757 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
758 1 + EAP_TTLS_CHAP_PASSWORD_LEN);
759 data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
760 *pos++ = data->ident;
761
762 /* MD5(Ident + Password + Challenge) */
763 chap_md5(data->ident, password, password_len, challenge,
764 EAP_TTLS_CHAP_CHALLENGE_LEN, pos);
765
766 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
767 identity, identity_len);
768 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
769 password, password_len);
770 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
771 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
772 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
773 pos, EAP_TTLS_CHAP_PASSWORD_LEN);
774 pos += EAP_TTLS_CHAP_PASSWORD_LEN;
775 os_free(challenge);
776 AVP_PAD(buf, pos);
777
778 wpabuf_put(msg, pos - buf);
779 *resp = msg;
780
fd2f2d04
JM		 781 /* EAP-TTLS/CHAP does not provide tunneled success
782 * notification, so assume that Phase2 succeeds. */
783 ret->methodState = METHOD_DONE;
784 ret->decision = DECISION_COND_SUCC;
6fc6879b
JM		 785
786 return 0;
835c89a1 787#endif /* CONFIG_FIPS */
6fc6879b
JM		 788}
789
790
791static int eap_ttls_phase2_request(struct eap_sm *sm,
792 struct eap_ttls_data *data,
793 struct eap_method_ret *ret,
794 struct eap_hdr *hdr,
795 struct wpabuf **resp)
796{
797 int res = 0;
798 size_t len;
799 enum phase2_types phase2_type = data->phase2_type;
800
801#ifdef EAP_TNC
802 if (data->tnc_started) {
803 wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC");
804 phase2_type = EAP_TTLS_PHASE2_EAP;
805 }
806#endif /* EAP_TNC */
807
808 if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
809 phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
810 phase2_type == EAP_TTLS_PHASE2_PAP ||
811 phase2_type == EAP_TTLS_PHASE2_CHAP) {
812 if (eap_get_config_identity(sm, &len) == NULL) {
813 wpa_printf(MSG_INFO,
814 "EAP-TTLS: Identity not configured");
815 eap_sm_request_identity(sm);
816 if (eap_get_config_password(sm, &len) == NULL)
817 eap_sm_request_password(sm);
818 return 0;
819 }
820
821 if (eap_get_config_password(sm, &len) == NULL) {
822 wpa_printf(MSG_INFO,
823 "EAP-TTLS: Password not configured");
824 eap_sm_request_password(sm);
825 return 0;
826 }
827 }
828
35f39ac4 829 switch (phase2_type) {
6fc6879b
JM		 830 case EAP_TTLS_PHASE2_EAP:
831 res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp);
832 break;
833 case EAP_TTLS_PHASE2_MSCHAPV2:
834 res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp);
835 break;
836 case EAP_TTLS_PHASE2_MSCHAP:
837 res = eap_ttls_phase2_request_mschap(sm, data, ret, resp);
838 break;
839 case EAP_TTLS_PHASE2_PAP:
840 res = eap_ttls_phase2_request_pap(sm, data, ret, resp);
841 break;
842 case EAP_TTLS_PHASE2_CHAP:
843 res = eap_ttls_phase2_request_chap(sm, data, ret, resp);
844 break;
845 default:
846 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
847 res = -1;
848 break;
849 }
850
851 if (res < 0) {
852 ret->methodState = METHOD_DONE;
853 ret->decision = DECISION_FAIL;
854 }
855
856 return res;
857}
858
859
6fc6879b
JM		 860struct ttls_parse_avp {
861 u8 *mschapv2;
862 u8 *eapdata;
863 size_t eap_len;
864 int mschapv2_error;
865};
866
867
868static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen,
869 struct ttls_parse_avp *parse)
870{
871 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
872 if (parse->eapdata == NULL) {
873 parse->eapdata = os_malloc(dlen);
874 if (parse->eapdata == NULL) {
875 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
876 "memory for Phase 2 EAP data");
877 return -1;
878 }
879 os_memcpy(parse->eapdata, dpos, dlen);
880 parse->eap_len = dlen;
881 } else {
882 u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen);
883 if (neweap == NULL) {
884 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
885 "memory for Phase 2 EAP data");
886 return -1;
887 }
888 os_memcpy(neweap + parse->eap_len, dpos, dlen);
889 parse->eapdata = neweap;
890 parse->eap_len += dlen;
891 }
892
893 return 0;
894}
895
896
897static int eap_ttls_parse_avp(u8 *pos, size_t left,
898 struct ttls_parse_avp *parse)
899{
900 struct ttls_avp *avp;
901 u32 avp_code, avp_length, vendor_id = 0;
902 u8 avp_flags, *dpos;
903 size_t dlen;
904
905 avp = (struct ttls_avp *) pos;
906 avp_code = be_to_host32(avp->avp_code);
907 avp_length = be_to_host32(avp->avp_length);
908 avp_flags = (avp_length >> 24) & 0xff;
909 avp_length &= 0xffffff;
910 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
911 "length=%d", (int) avp_code, avp_flags,
912 (int) avp_length);
913
914 if (avp_length > left) {
915 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
916 "(len=%d, left=%lu) - dropped",
917 (int) avp_length, (unsigned long) left);
918 return -1;
919 }
920
921 if (avp_length < sizeof(*avp)) {
922 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d",
923 avp_length);
924 return -1;
925 }
926
927 dpos = (u8 *) (avp + 1);
928 dlen = avp_length - sizeof(*avp);
929 if (avp_flags & AVP_FLAGS_VENDOR) {
930 if (dlen < 4) {
931 wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP "
932 "underflow");
933 return -1;
934 }
935 vendor_id = WPA_GET_BE32(dpos);
936 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
937 (int) vendor_id);
938 dpos += 4;
939 dlen -= 4;
940 }
941
942 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
943
944 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
945 if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0)
946 return -1;
947 } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
948 /* This is an optional message that can be displayed to
949 * the user. */
950 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message",
951 dpos, dlen);
952 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
953 avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
954 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success",
955 dpos, dlen);
956 if (dlen != 43) {
957 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
958 "MS-CHAP2-Success length "
959 "(len=%lu, expected 43)",
960 (unsigned long) dlen);
961 return -1;
962 }
963 parse->mschapv2 = dpos;
964 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
965 avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
966 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error",
967 dpos, dlen);
968 parse->mschapv2_error = 1;
969 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
970 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP "
971 "code %d vendor_id %d - dropped",
972 (int) avp_code, (int) vendor_id);
973 return -1;
974 } else {
975 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP "
976 "code %d vendor_id %d",
977 (int) avp_code, (int) vendor_id);
978 }
979
980 return avp_length;
981}
982
983
984static int eap_ttls_parse_avps(struct wpabuf *in_decrypted,
985 struct ttls_parse_avp *parse)
986{
987 u8 *pos;
988 size_t left, pad;
989 int avp_length;
990
991 pos = wpabuf_mhead(in_decrypted);
992 left = wpabuf_len(in_decrypted);
993 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left);
994 if (left < sizeof(struct ttls_avp)) {
995 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
996 " len=%lu expected %lu or more - dropped",
997 (unsigned long) left,
998 (unsigned long) sizeof(struct ttls_avp));
999 return -1;
1000 }
1001
1002 /* Parse AVPs */
1003 os_memset(parse, 0, sizeof(*parse));
1004
1005 while (left > 0) {
1006 avp_length = eap_ttls_parse_avp(pos, left, parse);
1007 if (avp_length < 0)
1008 return -1;
1009
1010 pad = (4 - (avp_length & 3)) & 3;
1011 pos += avp_length + pad;
1012 if (left < avp_length + pad)
1013 left = 0;
1014 else
1015 left -= avp_length + pad;
1016 }
1017
1018 return 0;
1019}
1020
1021
1022static u8 * eap_ttls_fake_identity_request(void)
1023{
1024 struct eap_hdr *hdr;
1025 u8 *buf;
1026
1027 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
1028 "Phase 2 - use fake EAP-Request Identity");
1029 buf = os_malloc(sizeof(*hdr) + 1);
1030 if (buf == NULL) {
1031 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
1032 "memory for fake EAP-Identity Request");
1033 return NULL;
1034 }
1035
1036 hdr = (struct eap_hdr *) buf;
1037 hdr->code = EAP_CODE_REQUEST;
1038 hdr->identifier = 0;
1039 hdr->length = host_to_be16(sizeof(*hdr) + 1);
1040 buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
1041
1042 return buf;
1043}
1044
1045
1046static int eap_ttls_encrypt_response(struct eap_sm *sm,
1047 struct eap_ttls_data *data,
1048 struct wpabuf *resp, u8 identifier,
1049 struct wpabuf **out_data)
1050{
1051 if (resp == NULL)
1052 return 0;
1053
1054 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
1055 resp);
1056 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1057 data->ttls_version, identifier,
1058 resp, out_data)) {
1059 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 "
1060 "frame");
9bd02739 1061 wpabuf_free(resp);
6fc6879b
JM		 1062 return -1;
1063 }
1064 wpabuf_free(resp);
1065
1066 return 0;
1067}
1068
1069
1070static int eap_ttls_process_phase2_eap(struct eap_sm *sm,
1071 struct eap_ttls_data *data,
1072 struct eap_method_ret *ret,
1073 struct ttls_parse_avp *parse,
1074 struct wpabuf **resp)
1075{
1076 struct eap_hdr *hdr;
1077 size_t len;
1078
1079 if (parse->eapdata == NULL) {
1080 wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the "
1081 "packet - dropped");
1082 return -1;
1083 }
1084
1085 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1086 parse->eapdata, parse->eap_len);
1087 hdr = (struct eap_hdr *) parse->eapdata;
1088
1089 if (parse->eap_len < sizeof(*hdr)) {
1090 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP "
1091 "frame (len=%lu, expected %lu or more) - dropped",
1092 (unsigned long) parse->eap_len,
1093 (unsigned long) sizeof(*hdr));
1094 return -1;
1095 }
1096 len = be_to_host16(hdr->length);
1097 if (len > parse->eap_len) {
1098 wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 "
1099 "EAP frame (EAP hdr len=%lu, EAP data len in "
1100 "AVP=%lu)",
1101 (unsigned long) len,
1102 (unsigned long) parse->eap_len);
1103 return -1;
1104 }
1105 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1106 "identifier=%d length=%lu",
1107 hdr->code, hdr->identifier, (unsigned long) len);
1108 switch (hdr->code) {
1109 case EAP_CODE_REQUEST:
1110 if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) {
1111 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1112 "processing failed");
1113 return -1;
1114 }
1115 break;
1116 default:
1117 wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1118 "Phase 2 EAP header", hdr->code);
1119 return -1;
1120 }
1121
1122 return 0;
1123}
1124
1125
1126static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
1127 struct eap_ttls_data *data,
1128 struct eap_method_ret *ret,
1129 struct ttls_parse_avp *parse)
1130{
37129688 1131#ifdef EAP_MSCHAPv2
6fc6879b
JM		 1132 if (parse->mschapv2_error) {
1133 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1134 "MS-CHAP-Error - failed");
1135 ret->methodState = METHOD_DONE;
1136 ret->decision = DECISION_FAIL;
1137 /* Reply with empty data to ACK error */
1138 return 1;
1139 }
1140
1141 if (parse->mschapv2 == NULL) {
35f39ac4
JM		 1142#ifdef EAP_TNC
1143 if (data->phase2_success && parse->eapdata) {
1144 /*
1145 * Allow EAP-TNC to be started after successfully
1146 * completed MSCHAPV2.
1147 */
1148 return 1;
1149 }
1150#endif /* EAP_TNC */
6fc6879b
JM		 1151 wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP "
1152 "received for Phase2 MSCHAPV2");
1153 return -1;
1154 }
1155 if (parse->mschapv2[0] != data->ident) {
1156 wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 "
1157 "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)",
1158 parse->mschapv2[0], data->ident);
1159 return -1;
1160 }
1161 if (!data->auth_response_valid ||
1162 mschapv2_verify_auth_response(data->auth_response,
1163 parse->mschapv2 + 1, 42)) {
1164 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator "
1165 "response in Phase 2 MSCHAPV2 success request");
1166 return -1;
1167 }
1168
1169 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1170 "authentication succeeded");
fd2f2d04
JM		 1171 ret->methodState = METHOD_DONE;
1172 ret->decision = DECISION_UNCOND_SUCC;
1173 data->phase2_success = 1;
6fc6879b
JM		 1174
1175 /*
1176 * Reply with empty data; authentication server will reply
1177 * with EAP-Success after this.
1178 */
1179 return 1;
37129688
JM		 1180#else /* EAP_MSCHAPv2 */
1181 wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
1182 return -1;
1183#endif /* EAP_MSCHAPv2 */
6fc6879b
JM		 1184}
1185
1186
1187#ifdef EAP_TNC
1188static int eap_ttls_process_tnc_start(struct eap_sm *sm,
1189 struct eap_ttls_data *data,
1190 struct eap_method_ret *ret,
1191 struct ttls_parse_avp *parse,
1192 struct wpabuf **resp)
1193{
1194 /* TNC uses inner EAP method after non-EAP TTLS phase 2. */
1195 if (parse->eapdata == NULL) {
1196 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1197 "unexpected tunneled data (no EAP)");
1198 return -1;
1199 }
1200
1201 if (!data->ready_for_tnc) {
1202 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1203 "EAP after non-EAP, but not ready for TNC");
1204 return -1;
1205 }
1206
1207 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
1208 "non-EAP method");
1209 data->tnc_started = 1;
1210
1211 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0)
1212 return -1;
1213
1214 return 0;
1215}
1216#endif /* EAP_TNC */
1217
1218
1219static int eap_ttls_process_decrypted(struct eap_sm *sm,
1220 struct eap_ttls_data *data,
1221 struct eap_method_ret *ret,
1222 u8 identifier,
1223 struct ttls_parse_avp *parse,
1224 struct wpabuf *in_decrypted,
1225 struct wpabuf **out_data)
1226{
1227 struct wpabuf *resp = NULL;
1228 struct eap_peer_config *config = eap_get_config(sm);
1229 int res;
1230 enum phase2_types phase2_type = data->phase2_type;
1231
1232#ifdef EAP_TNC
1233 if (data->tnc_started)
1234 phase2_type = EAP_TTLS_PHASE2_EAP;
1235#endif /* EAP_TNC */
1236
1237 switch (phase2_type) {
1238 case EAP_TTLS_PHASE2_EAP:
1239 if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) <
1240 0)
1241 return -1;
1242 break;
1243 case EAP_TTLS_PHASE2_MSCHAPV2:
1244 res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse);
1245#ifdef EAP_TNC
35f39ac4 1246 if (res == 1 && parse->eapdata && data->phase2_success) {
6fc6879b
JM		 1247 /*
1248 * TNC may be required as the next
1249 * authentication method within the tunnel.
1250 */
1251 ret->methodState = METHOD_MAY_CONT;
1252 data->ready_for_tnc = 1;
1253 if (eap_ttls_process_tnc_start(sm, data, ret, parse,
1254 &resp) == 0)
1255 break;
1256 }
1257#endif /* EAP_TNC */
1258 return res;
1259 case EAP_TTLS_PHASE2_MSCHAP:
1260 case EAP_TTLS_PHASE2_PAP:
1261 case EAP_TTLS_PHASE2_CHAP:
1262#ifdef EAP_TNC
1263 if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) <
1264 0)
1265 return -1;
1266 break;
1267#else /* EAP_TNC */
1268 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1269 * requests to the supplicant */
1270 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1271 "tunneled data");
1272 return -1;
1273#endif /* EAP_TNC */
1274 }
1275
1276 if (resp) {
1277 if (eap_ttls_encrypt_response(sm, data, resp, identifier,
1278 out_data) < 0)
1279 return -1;
1280 } else if (config->pending_req_identity ||
1281 config->pending_req_password ||
1282 config->pending_req_otp ||
1283 config->pending_req_new_password) {
1284 wpabuf_free(data->pending_phase2_req);
1285 data->pending_phase2_req = wpabuf_dup(in_decrypted);
1286 }
1287
1288 return 0;
1289}
1290
1291
6fc6879b
JM		 1292static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
1293 struct eap_ttls_data *data,
1294 struct eap_method_ret *ret,
1295 u8 identifier,
1296 struct wpabuf **out_data)
1297{
1298 int retval = 0;
1299 struct eap_hdr *hdr;
1300 struct wpabuf *resp;
1301
1302 hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
1303 if (hdr == NULL) {
1304 ret->methodState = METHOD_DONE;
1305 ret->decision = DECISION_FAIL;
1306 return -1;
1307 }
1308
1309 resp = NULL;
1310 if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
1311 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1312 "processing failed");
1313 retval = -1;
1314 } else {
af72d17e
JM		 1315 struct eap_peer_config *config = eap_get_config(sm);
1316 if (resp == NULL &&
1317 (config->pending_req_identity ||
1318 config->pending_req_password ||
1319 config->pending_req_otp ||
1320 config->pending_req_new_password)) {
1321 /*
1322 * Use empty buffer to force implicit request
1323 * processing when EAP request is re-processed after
1324 * user input.
1325 */
1326 wpabuf_free(data->pending_phase2_req);
1327 data->pending_phase2_req = wpabuf_alloc(0);
1328 }
1329
6fc6879b
JM		 1330 retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
1331 out_data);
1332 }
1333
1334 os_free(hdr);
1335
1336 if (retval < 0) {
1337 ret->methodState = METHOD_DONE;
1338 ret->decision = DECISION_FAIL;
1339 }
1340
1341 return retval;
1342}
1343
1344
1345static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
1346 struct eap_method_ret *ret, u8 identifier,
1347 struct wpabuf **out_data)
1348{
1349 data->phase2_start = 0;
1350
1351 /*
1352 * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
1353 * if TLS part was indeed resuming a previous session. Most
1354 * Authentication Servers terminate EAP-TTLS before reaching this
1355 * point, but some do not. Make wpa_supplicant stop phase 2 here, if
1356 * needed.
1357 */
1358 if (data->reauth &&
1359 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
1360 wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
1361 "skip phase 2");
1362 *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
1363 data->ttls_version);
1364 ret->methodState = METHOD_DONE;
1365 ret->decision = DECISION_UNCOND_SUCC;
1366 data->phase2_success = 1;
1367 return 0;
1368 }
1369
1370 return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
1371 out_data);
1372}
1373
1374
1375static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
1376 struct eap_method_ret *ret, u8 identifier,
1377 const struct wpabuf *in_data,
1378 struct wpabuf **out_data)
1379{
1380 struct wpabuf *in_decrypted = NULL;
1381 int retval = 0;
1382 struct ttls_parse_avp parse;
1383
1384 os_memset(&parse, 0, sizeof(parse));
1385
1386 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1387 " Phase 2",
1388 in_data ? (unsigned long) wpabuf_len(in_data) : 0);
1389
1390 if (data->pending_phase2_req) {
1391 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
1392 "skip decryption and use old data");
1393 /* Clear TLS reassembly state. */
1394 eap_peer_tls_reset_input(&data->ssl);
1395
1396 in_decrypted = data->pending_phase2_req;
1397 data->pending_phase2_req = NULL;
1398 if (wpabuf_len(in_decrypted) == 0) {
1399 wpabuf_free(in_decrypted);
1400 return eap_ttls_implicit_identity_request(
1401 sm, data, ret, identifier, out_data);
1402 }
1403 goto continue_req;
1404 }
1405
1406 if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
1407 data->phase2_start) {
1408 return eap_ttls_phase2_start(sm, data, ret, identifier,
1409 out_data);
1410 }
1411
1412 if (in_data == NULL || wpabuf_len(in_data) == 0) {
1413 /* Received TLS ACK - requesting more fragments */
1414 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1415 data->ttls_version,
1416 identifier, NULL, out_data);
1417 }
1418
1419 retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1420 if (retval)
1421 goto done;
1422
6fc6879b
JM		 1423continue_req:
1424 data->phase2_start = 0;
1425
1426 if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
1427 retval = -1;
1428 goto done;
1429 }
1430
1431 retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
1432 &parse, in_decrypted, out_data);
1433
1434done:
1435 wpabuf_free(in_decrypted);
1436 os_free(parse.eapdata);
1437
1438 if (retval < 0) {
1439 ret->methodState = METHOD_DONE;
1440 ret->decision = DECISION_FAIL;
1441 }
1442
1443 return retval;
1444}
1445
1446
6fc6879b
JM		 1447static int eap_ttls_process_handshake(struct eap_sm *sm,
1448 struct eap_ttls_data *data,
1449 struct eap_method_ret *ret,
1450 u8 identifier,
d36c803c 1451 const struct wpabuf *in_data,
6fc6879b
JM		 1452 struct wpabuf **out_data)
1453{
1454 int res;
1455
3c108b75
JM		 1456 if (sm->waiting_ext_cert_check && data->pending_resp) {
1457 struct eap_peer_config *config = eap_get_config(sm);
1458
1459 if (config->pending_ext_cert_check == EXT_CERT_CHECK_GOOD) {
1460 wpa_printf(MSG_DEBUG,
1461 "EAP-TTLS: External certificate check succeeded - continue handshake");
1462 *out_data = data->pending_resp;
1463 data->pending_resp = NULL;
1464 sm->waiting_ext_cert_check = 0;
1465 return 0;
1466 }
1467
1468 if (config->pending_ext_cert_check == EXT_CERT_CHECK_BAD) {
1469 wpa_printf(MSG_DEBUG,
1470 "EAP-TTLS: External certificate check failed - force authentication failure");
1471 ret->methodState = METHOD_DONE;
1472 ret->decision = DECISION_FAIL;
1473 sm->waiting_ext_cert_check = 0;
1474 return 0;
1475 }
1476
1477 wpa_printf(MSG_DEBUG,
1478 "EAP-TTLS: Continuing to wait external server certificate validation");
1479 return 0;
1480 }
1481
6fc6879b
JM		 1482 res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
1483 data->ttls_version, identifier,
d36c803c 1484 in_data, out_data);
bb912430
JM		 1485 if (res < 0) {
1486 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS processing failed");
1487 ret->methodState = METHOD_DONE;
1488 ret->decision = DECISION_FAIL;
1489 return -1;
1490 }
6fc6879b 1491
3c108b75
JM		 1492 if (sm->waiting_ext_cert_check) {
1493 wpa_printf(MSG_DEBUG,
1494 "EAP-TTLS: Waiting external server certificate validation");
1495 wpabuf_free(data->pending_resp);
1496 data->pending_resp = *out_data;
1497 *out_data = NULL;
1498 return 0;
1499 }
1500
6fc6879b
JM		 1501 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1502 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
1503 "Phase 2");
1504 if (data->resuming) {
1505 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
1506 "skip Phase 2");
1507 ret->decision = DECISION_COND_SUCC;
1508 ret->methodState = METHOD_MAY_CONT;
1509 }
1510 data->phase2_start = 1;
fd2f2d04 1511 eap_ttls_v0_derive_key(sm, data);
6fc6879b
JM		 1512
1513 if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
1514 if (eap_ttls_decrypt(sm, data, ret, identifier,
1515 NULL, out_data)) {
1516 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1517 "failed to process early "
1518 "start for Phase 2");
1519 }
1520 res = 0;
1521 }
1522 data->resuming = 0;
1523 }
1524
1525 if (res == 2) {
6fc6879b
JM		 1526 /*
1527 * Application data included in the handshake message.
1528 */
1529 wpabuf_free(data->pending_phase2_req);
1530 data->pending_phase2_req = *out_data;
1531 *out_data = NULL;
d36c803c 1532 res = eap_ttls_decrypt(sm, data, ret, identifier, in_data,
6fc6879b
JM		 1533 out_data);
1534 }
1535
1536 return res;
1537}
1538
1539
95de34a1 1540static void eap_ttls_check_auth_status(struct eap_sm *sm,
6fc6879b
JM		 1541 struct eap_ttls_data *data,
1542 struct eap_method_ret *ret)
1543{
fd2f2d04 1544 if (ret->methodState == METHOD_DONE) {
6fc6879b
JM		 1545 ret->allowNotifications = FALSE;
1546 if (ret->decision == DECISION_UNCOND_SUCC ||
1547 ret->decision == DECISION_COND_SUCC) {
1548 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1549 "completed successfully");
1550 data->phase2_success = 1;
0daa9f6a 1551 data->decision_succ = ret->decision;
6fc6879b
JM		 1552#ifdef EAP_TNC
1553 if (!data->ready_for_tnc && !data->tnc_started) {
1554 /*
1555 * TNC may be required as the next
1556 * authentication method within the tunnel.
1557 */
1558 ret->methodState = METHOD_MAY_CONT;
1559 data->ready_for_tnc = 1;
1560 }
1561#endif /* EAP_TNC */
1562 }
fd2f2d04 1563 } else if (ret->methodState == METHOD_MAY_CONT &&
6fc6879b
JM		 1564 (ret->decision == DECISION_UNCOND_SUCC ||
1565 ret->decision == DECISION_COND_SUCC)) {
1566 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1567 "completed successfully (MAY_CONT)");
1568 data->phase2_success = 1;
0daa9f6a
JM		 1569 data->decision_succ = ret->decision;
1570 } else if (data->decision_succ != DECISION_FAIL &&
1571 data->phase2_success &&
1572 !data->ssl.tls_out) {
1573 /*
1574 * This is needed to cover the case where the final Phase 2
1575 * message gets fragmented since fragmentation clears
1576 * decision back to FAIL.
1577 */
1578 wpa_printf(MSG_DEBUG,
1579 "EAP-TTLS: Restore success decision after fragmented frame sent completely");
1580 ret->decision = data->decision_succ;
6fc6879b
JM		 1581 }
1582}
1583
1584
1585static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
1586 struct eap_method_ret *ret,
1587 const struct wpabuf *reqData)
1588{
1589 size_t left;
1590 int res;
1591 u8 flags, id;
1592 struct wpabuf *resp;
1593 const u8 *pos;
1594 struct eap_ttls_data *data = priv;
d36c803c 1595 struct wpabuf msg;
6fc6879b
JM		 1596
1597 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
1598 reqData, &left, &flags);
1599 if (pos == NULL)
1600 return NULL;
1601 id = eap_get_id(reqData);
1602
1603 if (flags & EAP_TLS_FLAGS_START) {
fd2f2d04
JM		 1604 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own "
1605 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1606 data->ttls_version);
6fc6879b 1607
a9141cff
JM		 1608 /* RFC 5281, Ch. 9.2:
1609 * "This packet MAY contain additional information in the form
1610 * of AVPs, which may provide useful hints to the client"
1611 * For now, ignore any potential extra data.
6fc6879b
JM		 1612 */
1613 left = 0;
6fc6879b
JM		 1614 }
1615
d36c803c
JM		 1616 wpabuf_set(&msg, pos, left);
1617
6fc6879b
JM		 1618 resp = NULL;
1619 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1620 !data->resuming) {
6fc6879b
JM		 1621 res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
1622 } else {
1623 res = eap_ttls_process_handshake(sm, data, ret, id,
d36c803c 1624 &msg, &resp);
6fc6879b
JM		 1625 }
1626
1627 eap_ttls_check_auth_status(sm, data, ret);
1628
1629 /* FIX: what about res == -1? Could just move all error processing into
1630 * the other functions and get rid of this res==1 case here. */
1631 if (res == 1) {
1632 wpabuf_free(resp);
1633 return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
1634 data->ttls_version);
1635 }
1636 return resp;
1637}
1638
1639
1640static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1641{
1642 struct eap_ttls_data *data = priv;
1643 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1644 data->phase2_success;
1645}
1646
1647
1648static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1649{
1650 struct eap_ttls_data *data = priv;
1651 wpabuf_free(data->pending_phase2_req);
1652 data->pending_phase2_req = NULL;
3c108b75
JM		 1653 wpabuf_free(data->pending_resp);
1654 data->pending_resp = NULL;
0daa9f6a 1655 data->decision_succ = DECISION_FAIL;
6fc6879b
JM		 1656#ifdef EAP_TNC
1657 data->ready_for_tnc = 0;
1658 data->tnc_started = 0;
1659#endif /* EAP_TNC */
1660}
1661
1662
1663static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1664{
1665 struct eap_ttls_data *data = priv;
f534ee08 1666 eap_ttls_free_key(data);
950c5630
SL		 1667 os_free(data->session_id);
1668 data->session_id = NULL;
6fc6879b
JM		 1669 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1670 os_free(data);
1671 return NULL;
1672 }
1673 if (data->phase2_priv && data->phase2_method &&
1674 data->phase2_method->init_for_reauth)
1675 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1676 data->phase2_start = 0;
1677 data->phase2_success = 0;
1678 data->resuming = 1;
1679 data->reauth = 1;
1680 return priv;
1681}
1682
1683
1684static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1685 size_t buflen, int verbose)
1686{
1687 struct eap_ttls_data *data = priv;
1688 int len, ret;
1689
1690 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1691 ret = os_snprintf(buf + len, buflen - len,
1692 "EAP-TTLSv%d Phase2 method=",
1693 data->ttls_version);
d85e1fc8 1694 if (os_snprintf_error(buflen - len, ret))
6fc6879b
JM		 1695 return len;
1696 len += ret;
1697 switch (data->phase2_type) {
1698 case EAP_TTLS_PHASE2_EAP:
1699 ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
1700 data->phase2_method ?
1701 data->phase2_method->name : "?");
1702 break;
1703 case EAP_TTLS_PHASE2_MSCHAPV2:
1704 ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
1705 break;
1706 case EAP_TTLS_PHASE2_MSCHAP:
1707 ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
1708 break;
1709 case EAP_TTLS_PHASE2_PAP:
1710 ret = os_snprintf(buf + len, buflen - len, "PAP\n");
1711 break;
1712 case EAP_TTLS_PHASE2_CHAP:
1713 ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
1714 break;
1715 default:
1716 ret = 0;
1717 break;
1718 }
1f102d3b 1719 if (os_snprintf_error(buflen - len, ret))
6fc6879b
JM		 1720 return len;
1721 len += ret;
1722
1723 return len;
1724}
1725
1726
1727static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1728{
1729 struct eap_ttls_data *data = priv;
1730 return data->key_data != NULL && data->phase2_success;
1731}
1732
1733
1734static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1735{
1736 struct eap_ttls_data *data = priv;
1737 u8 *key;
1738
1739 if (data->key_data == NULL || !data->phase2_success)
1740 return NULL;
1741
1742 key = os_malloc(EAP_TLS_KEY_LEN);
1743 if (key == NULL)
1744 return NULL;
1745
1746 *len = EAP_TLS_KEY_LEN;
1747 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1748
1749 return key;
1750}
1751
1752
950c5630
SL		 1753static u8 * eap_ttls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1754{
1755 struct eap_ttls_data *data = priv;
1756 u8 *id;
1757
1758 if (data->session_id == NULL || !data->phase2_success)
1759 return NULL;
1760
1761 id = os_malloc(data->id_len);
1762 if (id == NULL)
1763 return NULL;
1764
1765 *len = data->id_len;
1766 os_memcpy(id, data->session_id, data->id_len);
1767
1768 return id;
1769}
1770
1771
a7bec9e7
JM		 1772static u8 * eap_ttls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1773{
1774 struct eap_ttls_data *data = priv;
1775 u8 *key;
1776
1777 if (data->key_data == NULL)
1778 return NULL;
1779
1780 key = os_malloc(EAP_EMSK_LEN);
1781 if (key == NULL)
1782 return NULL;
1783
1784 *len = EAP_EMSK_LEN;
1785 os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
1786
1787 return key;
1788}
1789
1790
6fc6879b
JM		 1791int eap_peer_ttls_register(void)
1792{
1793 struct eap_method *eap;
6fc6879b
JM		 1794
1795 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1796 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1797 if (eap == NULL)
1798 return -1;
1799
1800 eap->init = eap_ttls_init;
1801 eap->deinit = eap_ttls_deinit;
1802 eap->process = eap_ttls_process;
1803 eap->isKeyAvailable = eap_ttls_isKeyAvailable;
1804 eap->getKey = eap_ttls_getKey;
950c5630 1805 eap->getSessionId = eap_ttls_get_session_id;
6fc6879b
JM		 1806 eap->get_status = eap_ttls_get_status;
1807 eap->has_reauth_data = eap_ttls_has_reauth_data;
1808 eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
1809 eap->init_for_reauth = eap_ttls_init_for_reauth;
a7bec9e7 1810 eap->get_emsk = eap_ttls_get_emsk;
6fc6879b 1811
49a26bb3 1812 return eap_peer_method_register(eap);
6fc6879b 1813}
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