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MFC: An off-by-one malloc size was corrupting the installer's memory,
[dragonfly.git] / contrib / wpa_supplicant-0.5.8 / eap_ttls.c
blobca0069439ac4d3e37f78fcadf9eb39439098064a
1 /*
2 * EAP peer method: EAP-TTLS (draft-ietf-pppext-eap-ttls-03.txt)
3 * Copyright (c) 2004-2006, 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_i.h"
19 #include "eap_tls_common.h"
20 #include "config_ssid.h"
21 #include "ms_funcs.h"
22 #include "sha1.h"
23 #include "crypto.h"
24 #include "tls.h"
25 #include "eap_ttls.h"
26
27
28 /* Maximum supported PEAP version
29 * 0 = draft-ietf-pppext-eap-ttls-03.txt / draft-funk-eap-ttls-v0-00.txt
30 * 1 = draft-funk-eap-ttls-v1-00.txt
31 */
32 #define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */
33
34
35 #define MSCHAPV2_KEY_LEN 16
36
37
38 static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
39
40
41 struct eap_ttls_data {
42 struct eap_ssl_data ssl;
43 int ssl_initialized;
44
45 int ttls_version, force_ttls_version;
46
47 const struct eap_method *phase2_method;
48 void *phase2_priv;
49 int phase2_success;
50 int phase2_start;
51
52 enum {
53 EAP_TTLS_PHASE2_EAP,
54 EAP_TTLS_PHASE2_MSCHAPV2,
55 EAP_TTLS_PHASE2_MSCHAP,
56 EAP_TTLS_PHASE2_PAP,
57 EAP_TTLS_PHASE2_CHAP
58 } phase2_type;
59 struct eap_method_type phase2_eap_type;
60 struct eap_method_type *phase2_eap_types;
61 size_t num_phase2_eap_types;
62
63 u8 auth_response[20];
64 int auth_response_valid;
65 u8 ident;
66 int resuming; /* starting a resumed session */
67 int reauth; /* reauthentication */
68 u8 *key_data;
69
70 u8 *pending_phase2_req;
71 size_t pending_phase2_req_len;
72 };
73
74
75 static void * eap_ttls_init(struct eap_sm *sm)
76 {
77 struct eap_ttls_data *data;
78 struct wpa_ssid *config = eap_get_config(sm);
79 char *selected;
80
81 data = os_zalloc(sizeof(*data));
82 if (data == NULL)
83 return NULL;
84 data->ttls_version = EAP_TTLS_VERSION;
85 data->force_ttls_version = -1;
86 selected = "EAP";
87 data->phase2_type = EAP_TTLS_PHASE2_EAP;
88
89 if (config && config->phase1) {
90 char *pos = os_strstr(config->phase1, "ttlsver=");
91 if (pos) {
92 data->force_ttls_version = atoi(pos + 8);
93 data->ttls_version = data->force_ttls_version;
94 wpa_printf(MSG_DEBUG, "EAP-TTLS: Forced TTLS version "
95 "%d", data->force_ttls_version);
96 }
97 }
98
99 if (config && config->phase2) {
100 if (os_strstr(config->phase2, "autheap=")) {
101 selected = "EAP";
102 data->phase2_type = EAP_TTLS_PHASE2_EAP;
103 } else if (os_strstr(config->phase2, "auth=MSCHAPV2")) {
104 selected = "MSCHAPV2";
105 data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
106 } else if (os_strstr(config->phase2, "auth=MSCHAP")) {
107 selected = "MSCHAP";
108 data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
109 } else if (os_strstr(config->phase2, "auth=PAP")) {
110 selected = "PAP";
111 data->phase2_type = EAP_TTLS_PHASE2_PAP;
112 } else if (os_strstr(config->phase2, "auth=CHAP")) {
113 selected = "CHAP";
114 data->phase2_type = EAP_TTLS_PHASE2_CHAP;
115 }
116 }
117 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
118
119 if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
120 if (config && config->phase2) {
121 char *start, *pos, *buf;
122 struct eap_method_type *methods = NULL, *_methods;
123 u8 method;
124 size_t num_methods = 0;
125 start = buf = os_strdup(config->phase2);
126 if (buf == NULL) {
127 eap_ttls_deinit(sm, data);
128 return NULL;
129 }
130 while (start && *start != '\0') {
131 int vendor;
132 pos = os_strstr(start, "autheap=");
133 if (pos == NULL)
134 break;
135 if (start != pos && *(pos - 1) != ' ') {
136 start = pos + 8;
137 continue;
138 }
139
140 start = pos + 8;
141 pos = os_strchr(start, ' ');
142 if (pos)
143 *pos++ = '\0';
144 method = eap_get_phase2_type(start, &vendor);
145 if (vendor == EAP_VENDOR_IETF &&
146 method == EAP_TYPE_NONE) {
147 wpa_printf(MSG_ERROR, "EAP-TTLS: "
148 "Unsupported Phase2 EAP "
149 "method '%s'", start);
150 } else {
151 num_methods++;
152 _methods = os_realloc(
153 methods, num_methods *
154 sizeof(*methods));
155 if (_methods == NULL) {
156 os_free(methods);
157 os_free(buf);
158 eap_ttls_deinit(sm, data);
159 return NULL;
160 }
161 methods = _methods;
162 methods[num_methods - 1].vendor =
163 vendor;
164 methods[num_methods - 1].method =
165 method;
166 }
167
168 start = pos;
169 }
170 os_free(buf);
171 data->phase2_eap_types = methods;
172 data->num_phase2_eap_types = num_methods;
173 }
174 if (data->phase2_eap_types == NULL) {
175 data->phase2_eap_types = eap_get_phase2_types(
176 config, &data->num_phase2_eap_types);
177 }
178 if (data->phase2_eap_types == NULL) {
179 wpa_printf(MSG_ERROR, "EAP-TTLS: No Phase2 EAP method "
180 "available");
181 eap_ttls_deinit(sm, data);
182 return NULL;
183 }
184 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase2 EAP types",
185 (u8 *) data->phase2_eap_types,
186 data->num_phase2_eap_types *
187 sizeof(struct eap_method_type));
188 data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
189 data->phase2_eap_type.method = EAP_TYPE_NONE;
190 }
191
192 if (!(tls_capabilities(sm->ssl_ctx) & TLS_CAPABILITY_IA) &&
193 data->ttls_version > 0) {
194 if (data->force_ttls_version > 0) {
195 wpa_printf(MSG_INFO, "EAP-TTLS: Forced TTLSv%d and "
196 "TLS library does not support TLS/IA.",
197 data->force_ttls_version);
198 eap_ttls_deinit(sm, data);
199 return NULL;
200 }
201 data->ttls_version = 0;
202 }
203
204 return data;
205 }
206
207
208 static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
209 {
210 struct eap_ttls_data *data = priv;
211 if (data == NULL)
212 return;
213 if (data->phase2_priv && data->phase2_method)
214 data->phase2_method->deinit(sm, data->phase2_priv);
215 os_free(data->phase2_eap_types);
216 if (data->ssl_initialized)
217 eap_tls_ssl_deinit(sm, &data->ssl);
218 os_free(data->key_data);
219 os_free(data->pending_phase2_req);
220 os_free(data);
221 }
222
223
224 static int eap_ttls_encrypt(struct eap_sm *sm, struct eap_ttls_data *data,
225 int id, const u8 *plain, size_t plain_len,
226 u8 **out_data, size_t *out_len)
227 {
228 int res;
229 u8 *pos;
230 struct eap_hdr *resp;
231
232 /* TODO: add support for fragmentation, if needed. This will need to
233 * add TLS Message Length field, if the frame is fragmented. */
234 resp = os_malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit);
235 if (resp == NULL)
236 return -1;
237
238 resp->code = EAP_CODE_RESPONSE;
239 resp->identifier = id;
240
241 pos = (u8 *) (resp + 1);
242 *pos++ = EAP_TYPE_TTLS;
243 *pos++ = data->ttls_version;
244
245 res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
246 plain, plain_len,
247 pos, data->ssl.tls_out_limit);
248 if (res < 0) {
249 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 "
250 "data");
251 os_free(resp);
252 return -1;
253 }
254
255 *out_len = sizeof(struct eap_hdr) + 2 + res;
256 resp->length = host_to_be16(*out_len);
257 *out_data = (u8 *) resp;
258 return 0;
259 }
260
261
262 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
263 int mandatory, size_t len)
264 {
265 struct ttls_avp_vendor *avp;
266 u8 flags;
267 size_t hdrlen;
268
269 avp = (struct ttls_avp_vendor *) avphdr;
270 flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
271 if (vendor_id) {
272 flags |= AVP_FLAGS_VENDOR;
273 hdrlen = sizeof(*avp);
274 avp->vendor_id = host_to_be32(vendor_id);
275 } else {
276 hdrlen = sizeof(struct ttls_avp);
277 }
278
279 avp->avp_code = host_to_be32(avp_code);
280 avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
281
282 return avphdr + hdrlen;
283 }
284
285
286 static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
287 u32 vendor_id, int mandatory,
288 u8 *data, size_t len)
289 {
290 u8 *pos;
291 pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
292 os_memcpy(pos, data, len);
293 pos += len;
294 AVP_PAD(start, pos);
295 return pos;
296 }
297
298
299 static int eap_ttls_avp_encapsulate(u8 **resp, size_t *resp_len, u32 avp_code,
300 int mandatory)
301 {
302 u8 *avp, *pos;
303
304 avp = os_malloc(sizeof(struct ttls_avp) + *resp_len + 4);
305 if (avp == NULL) {
306 os_free(*resp);
307 *resp = NULL;
308 *resp_len = 0;
309 return -1;
310 }
311
312 pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, *resp_len);
313 os_memcpy(pos, *resp, *resp_len);
314 pos += *resp_len;
315 AVP_PAD(avp, pos);
316 os_free(*resp);
317 *resp = avp;
318 *resp_len = pos - avp;
319 return 0;
320 }
321
322
323 static int eap_ttls_ia_permute_inner_secret(struct eap_sm *sm,
324 struct eap_ttls_data *data,
325 const u8 *key, size_t key_len)
326 {
327 u8 *buf;
328 size_t buf_len;
329 int ret;
330
331 if (key) {
332 buf_len = 2 + key_len;
333 buf = os_malloc(buf_len);
334 if (buf == NULL)
335 return -1;
336 WPA_PUT_BE16(buf, key_len);
337 os_memcpy(buf + 2, key, key_len);
338 } else {
339 buf = NULL;
340 buf_len = 0;
341 }
342
343 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Session keys for TLS/IA inner "
344 "secret permutation", buf, buf_len);
345 ret = tls_connection_ia_permute_inner_secret(sm->ssl_ctx,
346 data->ssl.conn,
347 buf, buf_len);
348 os_free(buf);
349
350 return ret;
351 }
352
353
354 static int eap_ttls_v0_derive_key(struct eap_sm *sm,
355 struct eap_ttls_data *data)
356 {
357 os_free(data->key_data);
358 data->key_data = eap_tls_derive_key(sm, &data->ssl,
359 "ttls keying material",
360 EAP_TLS_KEY_LEN);
361 if (!data->key_data) {
362 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
363 return -1;
364 }
365
366 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
367 data->key_data, EAP_TLS_KEY_LEN);
368
369 return 0;
370 }
371
372
373 static int eap_ttls_v1_derive_key(struct eap_sm *sm,
374 struct eap_ttls_data *data)
375 {
376 struct tls_keys keys;
377 u8 *rnd;
378
379 os_free(data->key_data);
380 data->key_data = NULL;
381
382 os_memset(&keys, 0, sizeof(keys));
383 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
384 keys.client_random == NULL || keys.server_random == NULL ||
385 keys.inner_secret == NULL) {
386 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
387 "client random, or server random to derive keying "
388 "material");
389 return -1;
390 }
391
392 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
393 data->key_data = os_malloc(EAP_TLS_KEY_LEN);
394 if (rnd == NULL || data->key_data == NULL) {
395 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for key derivation");
396 os_free(rnd);
397 os_free(data->key_data);
398 data->key_data = NULL;
399 return -1;
400 }
401 os_memcpy(rnd, keys.client_random, keys.client_random_len);
402 os_memcpy(rnd + keys.client_random_len, keys.server_random,
403 keys.server_random_len);
404
405 if (tls_prf(keys.inner_secret, keys.inner_secret_len,
406 "ttls v1 keying material", rnd, keys.client_random_len +
407 keys.server_random_len, data->key_data, EAP_TLS_KEY_LEN)) {
408 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
409 os_free(rnd);
410 os_free(data->key_data);
411 data->key_data = NULL;
412 return -1;
413 }
414
415 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: client/server random",
416 rnd, keys.client_random_len + keys.server_random_len);
417 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: TLS/IA inner secret",
418 keys.inner_secret, keys.inner_secret_len);
419
420 os_free(rnd);
421
422 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
423 data->key_data, EAP_TLS_KEY_LEN);
424
425 return 0;
426 }
427
428
429 static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
430 struct eap_ttls_data *data, size_t len)
431 {
432 struct tls_keys keys;
433 u8 *challenge, *rnd;
434
435 if (data->ttls_version == 0) {
436 return eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
437 len);
438 }
439
440 os_memset(&keys, 0, sizeof(keys));
441 if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
442 keys.client_random == NULL || keys.server_random == NULL ||
443 keys.inner_secret == NULL) {
444 wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
445 "client random, or server random to derive "
446 "implicit challenge");
447 return NULL;
448 }
449
450 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
451 challenge = os_malloc(len);
452 if (rnd == NULL || challenge == NULL) {
453 wpa_printf(MSG_INFO, "EAP-TTLS: No memory for implicit "
454 "challenge derivation");
455 os_free(rnd);
456 os_free(challenge);
457 return NULL;
458 }
459 os_memcpy(rnd, keys.server_random, keys.server_random_len);
460 os_memcpy(rnd + keys.server_random_len, keys.client_random,
461 keys.client_random_len);
462
463 if (tls_prf(keys.inner_secret, keys.inner_secret_len,
464 "inner application challenge", rnd,
465 keys.client_random_len + keys.server_random_len,
466 challenge, len)) {
467 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive implicit "
468 "challenge");
469 os_free(rnd);
470 os_free(challenge);
471 return NULL;
472 }
473
474 os_free(rnd);
475
476 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived implicit challenge",
477 challenge, len);
478
479 return challenge;
480 }
481
482
483 static int eap_ttls_phase2_nak(struct eap_ttls_data *data, struct eap_hdr *hdr,
484 u8 **resp, size_t *resp_len)
485 {
486 struct eap_hdr *resp_hdr;
487 u8 *pos = (u8 *) (hdr + 1);
488 size_t i;
489
490 /* TODO: add support for expanded Nak */
491 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 Request: Nak type=%d", *pos);
492 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Allowed Phase2 EAP types",
493 (u8 *) data->phase2_eap_types, data->num_phase2_eap_types *
494 sizeof(struct eap_method_type));
495 *resp_len = sizeof(struct eap_hdr) + 1;
496 *resp = os_malloc(*resp_len + data->num_phase2_eap_types);
497 if (*resp == NULL)
498 return -1;
499
500 resp_hdr = (struct eap_hdr *) (*resp);
501 resp_hdr->code = EAP_CODE_RESPONSE;
502 resp_hdr->identifier = hdr->identifier;
503 pos = (u8 *) (resp_hdr + 1);
504 *pos++ = EAP_TYPE_NAK;
505 for (i = 0; i < data->num_phase2_eap_types; i++) {
506 if (data->phase2_eap_types[i].vendor == EAP_VENDOR_IETF &&
507 data->phase2_eap_types[i].method < 256) {
508 (*resp_len)++;
509 *pos++ = data->phase2_eap_types[i].method;
510 }
511 }
512 resp_hdr->length = host_to_be16(*resp_len);
513
514 return 0;
515 }
516
517
518 static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
519 struct eap_ttls_data *data,
520 struct eap_method_ret *ret,
521 struct eap_hdr *hdr,
522 u8 **resp, size_t *resp_len)
523 {
524 size_t len = be_to_host16(hdr->length);
525 u8 *pos;
526 struct eap_method_ret iret;
527 struct wpa_ssid *config = eap_get_config(sm);
528
529 if (len <= sizeof(struct eap_hdr)) {
530 wpa_printf(MSG_INFO, "EAP-TTLS: too short "
531 "Phase 2 request (len=%lu)", (unsigned long) len);
532 return -1;
533 }
534 pos = (u8 *) (hdr + 1);
535 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
536 switch (*pos) {
537 case EAP_TYPE_IDENTITY:
538 *resp = eap_sm_buildIdentity(sm, hdr->identifier, resp_len, 1);
539 break;
540 default:
541 if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
542 data->phase2_eap_type.method == EAP_TYPE_NONE) {
543 size_t i;
544 for (i = 0; i < data->num_phase2_eap_types; i++) {
545 if (data->phase2_eap_types[i].vendor !=
546 EAP_VENDOR_IETF ||
547 data->phase2_eap_types[i].method != *pos)
548 continue;
549
550 data->phase2_eap_type.vendor =
551 data->phase2_eap_types[i].vendor;
552 data->phase2_eap_type.method =
553 data->phase2_eap_types[i].method;
554 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
555 "Phase 2 EAP vendor %d method %d",
556 data->phase2_eap_type.vendor,
557 data->phase2_eap_type.method);
558 break;
559 }
560 }
561 if (*pos != data->phase2_eap_type.method ||
562 *pos == EAP_TYPE_NONE) {
563 if (eap_ttls_phase2_nak(data, hdr, resp, resp_len))
564 return -1;
565 break;
566 }
567
568 if (data->phase2_priv == NULL) {
569 data->phase2_method = eap_sm_get_eap_methods(
570 EAP_VENDOR_IETF, *pos);
571 if (data->phase2_method) {
572 sm->init_phase2 = 1;
573 sm->mschapv2_full_key = 1;
574 data->phase2_priv =
575 data->phase2_method->init(sm);
576 sm->init_phase2 = 0;
577 sm->mschapv2_full_key = 0;
578 }
579 }
580 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
581 wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
582 "Phase 2 EAP method %d", *pos);
583 return -1;
584 }
585 os_memset(&iret, 0, sizeof(iret));
586 *resp = data->phase2_method->process(sm, data->phase2_priv,
587 &iret, (u8 *) hdr, len,
588 resp_len);
589 if ((iret.methodState == METHOD_DONE ||
590 iret.methodState == METHOD_MAY_CONT) &&
591 (iret.decision == DECISION_UNCOND_SUCC ||
592 iret.decision == DECISION_COND_SUCC ||
593 iret.decision == DECISION_FAIL)) {
594 ret->methodState = iret.methodState;
595 ret->decision = iret.decision;
596 }
597 if (data->ttls_version > 0) {
598 const struct eap_method *m = data->phase2_method;
599 void *priv = data->phase2_priv;
600
601 /* TTLSv1 requires TLS/IA FinalPhaseFinished */
602 if (ret->decision == DECISION_UNCOND_SUCC)
603 ret->decision = DECISION_COND_SUCC;
604 ret->methodState = METHOD_CONT;
605
606 if (ret->decision == DECISION_COND_SUCC &&
607 m->isKeyAvailable && m->getKey &&
608 m->isKeyAvailable(sm, priv)) {
609 u8 *key;
610 size_t key_len;
611 key = m->getKey(sm, priv, &key_len);
612 if (key) {
613 eap_ttls_ia_permute_inner_secret(
614 sm, data, key, key_len);
615 os_free(key);
616 }
617 }
618 }
619 break;
620 }
621
622 if (*resp == NULL &&
623 (config->pending_req_identity || config->pending_req_password ||
624 config->pending_req_otp)) {
625 return 0;
626 }
627
628 if (*resp == NULL)
629 return -1;
630
631 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
632 *resp, *resp_len);
633 return eap_ttls_avp_encapsulate(resp, resp_len,
634 RADIUS_ATTR_EAP_MESSAGE, 1);
635 }
636
637
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 u8 **resp, size_t *resp_len)
642 {
643 struct wpa_ssid *config = eap_get_config(sm);
644 u8 *buf, *pos, *challenge, *username, *peer_challenge;
645 size_t username_len, i;
646
647 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
648
649 /* MSCHAPv2 does not include optional domain name in the
650 * challenge-response calculation, so remove domain prefix
651 * (if present). */
652 username = config->identity;
653 username_len = config->identity_len;
654 pos = username;
655 for (i = 0; i < username_len; i++) {
656 if (username[i] == '\\') {
657 username_len -= i + 1;
658 username += i + 1;
659 break;
660 }
661 }
662
663 pos = buf = os_malloc(config->identity_len + 1000);
664 if (buf == NULL) {
665 wpa_printf(MSG_ERROR,
666 "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
667 return -1;
668 }
669
670 /* User-Name */
671 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
672 config->identity, config->identity_len);
673
674 /* MS-CHAP-Challenge */
675 challenge = eap_ttls_implicit_challenge(
676 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN * 2 + 1);
677 if (challenge == NULL) {
678 os_free(buf);
679 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
680 "implicit challenge");
681 return -1;
682 }
683 peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
684
685 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
686 RADIUS_VENDOR_ID_MICROSOFT, 1,
687 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
688
689 /* MS-CHAP2-Response */
690 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
691 RADIUS_VENDOR_ID_MICROSOFT, 1,
692 EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
693 data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
694 *pos++ = data->ident;
695 *pos++ = 0; /* Flags */
696 os_memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
697 pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
698 os_memset(pos, 0, 8); /* Reserved, must be zero */
699 pos += 8;
700 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: implicit auth_challenge",
701 challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
702 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: peer_challenge",
703 peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
704 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 username",
705 username, username_len);
706 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 password",
707 config->password, config->password_len);
708 generate_nt_response(challenge, peer_challenge,
709 username, username_len,
710 config->password, config->password_len,
711 pos);
712 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 response", pos, 24);
713 generate_authenticator_response(config->password, config->password_len,
714 peer_challenge, challenge,
715 username, username_len,
716 pos, data->auth_response);
717 data->auth_response_valid = 1;
718
719 if (data->ttls_version > 0) {
720 u8 pw_hash[16], pw_hash_hash[16], master_key[16];
721 u8 session_key[2 * MSCHAPV2_KEY_LEN];
722 nt_password_hash(config->password, config->password_len,
723 pw_hash);
724 hash_nt_password_hash(pw_hash, pw_hash_hash);
725 get_master_key(pw_hash_hash, pos /* nt_response */,
726 master_key);
727 get_asymetric_start_key(master_key, session_key,
728 MSCHAPV2_KEY_LEN, 0, 0);
729 get_asymetric_start_key(master_key,
730 session_key + MSCHAPV2_KEY_LEN,
731 MSCHAPV2_KEY_LEN, 1, 0);
732 eap_ttls_ia_permute_inner_secret(sm, data,
733 session_key,
734 sizeof(session_key));
735 }
736
737 pos += 24;
738 os_free(challenge);
739 AVP_PAD(buf, pos);
740
741 *resp = buf;
742 *resp_len = pos - buf;
743
744 if (sm->workaround && data->ttls_version == 0) {
745 /* At least FreeRADIUS seems to be terminating
746 * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
747 * packet. */
748 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
749 "allow success without tunneled response");
750 ret->methodState = METHOD_MAY_CONT;
751 ret->decision = DECISION_COND_SUCC;
752 }
753
754 return 0;
755 }
756
757
758 static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
759 struct eap_ttls_data *data,
760 struct eap_method_ret *ret,
761 u8 **resp, size_t *resp_len)
762 {
763 struct wpa_ssid *config = eap_get_config(sm);
764 u8 *buf, *pos, *challenge;
765
766 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
767
768 pos = buf = os_malloc(config->identity_len + 1000);
769 if (buf == NULL) {
770 wpa_printf(MSG_ERROR,
771 "EAP-TTLS/MSCHAP: Failed to allocate memory");
772 return -1;
773 }
774
775 /* User-Name */
776 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
777 config->identity, config->identity_len);
778
779 /* MS-CHAP-Challenge */
780 challenge = eap_ttls_implicit_challenge(sm, data, EAP_TLS_KEY_LEN);
781 if (challenge == NULL) {
782 os_free(buf);
783 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
784 "implicit challenge");
785 return -1;
786 }
787
788 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
789 RADIUS_VENDOR_ID_MICROSOFT, 1,
790 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
791
792 /* MS-CHAP-Response */
793 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
794 RADIUS_VENDOR_ID_MICROSOFT, 1,
795 EAP_TTLS_MSCHAP_RESPONSE_LEN);
796 data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
797 *pos++ = data->ident;
798 *pos++ = 1; /* Flags: Use NT style passwords */
799 os_memset(pos, 0, 24); /* LM-Response */
800 pos += 24;
801 nt_challenge_response(challenge,
802 config->password, config->password_len,
803 pos); /* NT-Response */
804 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
805 config->password, config->password_len);
806 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
807 challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
808 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
809 pos += 24;
810 os_free(challenge);
811 AVP_PAD(buf, pos);
812
813 *resp = buf;
814 *resp_len = pos - buf;
815
816 if (data->ttls_version > 0) {
817 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
818 * so do not allow connection to be terminated yet. */
819 ret->methodState = METHOD_CONT;
820 ret->decision = DECISION_COND_SUCC;
821 } else {
822 /* EAP-TTLS/MSCHAP does not provide tunneled success
823 * notification, so assume that Phase2 succeeds. */
824 ret->methodState = METHOD_DONE;
825 ret->decision = DECISION_COND_SUCC;
826 }
827
828 return 0;
829 }
830
831
832 static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
833 struct eap_ttls_data *data,
834 struct eap_method_ret *ret,
835 u8 **resp, size_t *resp_len)
836 {
837 struct wpa_ssid *config = eap_get_config(sm);
838 u8 *buf, *pos;
839 size_t pad;
840
841 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
842
843 pos = buf = os_malloc(config->identity_len + config->password_len +
844 100);
845 if (buf == NULL) {
846 wpa_printf(MSG_ERROR,
847 "EAP-TTLS/PAP: Failed to allocate memory");
848 return -1;
849 }
850
851 /* User-Name */
852 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
853 config->identity, config->identity_len);
854
855 /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
856 * the data, so no separate encryption is used in the AVP itself.
857 * However, the password is padded to obfuscate its length. */
858 pad = (16 - (config->password_len & 15)) & 15;
859 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
860 config->password_len + pad);
861 os_memcpy(pos, config->password, config->password_len);
862 pos += config->password_len;
863 os_memset(pos, 0, pad);
864 pos += pad;
865 AVP_PAD(buf, pos);
866
867 *resp = buf;
868 *resp_len = pos - buf;
869
870 if (data->ttls_version > 0) {
871 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
872 * so do not allow connection to be terminated yet. */
873 ret->methodState = METHOD_CONT;
874 ret->decision = DECISION_COND_SUCC;
875 } else {
876 /* EAP-TTLS/PAP does not provide tunneled success notification,
877 * so assume that Phase2 succeeds. */
878 ret->methodState = METHOD_DONE;
879 ret->decision = DECISION_COND_SUCC;
880 }
881
882 return 0;
883 }
884
885
886 static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
887 struct eap_ttls_data *data,
888 struct eap_method_ret *ret,
889 u8 **resp, size_t *resp_len)
890 {
891 struct wpa_ssid *config = eap_get_config(sm);
892 u8 *buf, *pos, *challenge;
893 const u8 *addr[3];
894 size_t len[3];
895
896 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
897
898 pos = buf = os_malloc(config->identity_len + 1000);
899 if (buf == NULL) {
900 wpa_printf(MSG_ERROR,
901 "EAP-TTLS/CHAP: Failed to allocate memory");
902 return -1;
903 }
904
905 /* User-Name */
906 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
907 config->identity, config->identity_len);
908
909 /* CHAP-Challenge */
910 challenge = eap_ttls_implicit_challenge(sm, data, EAP_TLS_KEY_LEN);
911 if (challenge == NULL) {
912 os_free(buf);
913 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
914 "implicit challenge");
915 return -1;
916 }
917
918 pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
919 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
920
921 /* CHAP-Password */
922 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
923 1 + EAP_TTLS_CHAP_PASSWORD_LEN);
924 data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
925 *pos++ = data->ident;
926
927 /* MD5(Ident + Password + Challenge) */
928 addr[0] = &data->ident;
929 len[0] = 1;
930 addr[1] = config->password;
931 len[1] = config->password_len;
932 addr[2] = challenge;
933 len[2] = EAP_TTLS_CHAP_CHALLENGE_LEN;
934 md5_vector(3, addr, len, pos);
935
936 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
937 config->identity, config->identity_len);
938 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
939 config->password, config->password_len);
940 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
941 challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
942 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
943 pos, EAP_TTLS_CHAP_PASSWORD_LEN);
944 pos += EAP_TTLS_CHAP_PASSWORD_LEN;
945 os_free(challenge);
946 AVP_PAD(buf, pos);
947
948 *resp = buf;
949 *resp_len = pos - buf;
950
951 if (data->ttls_version > 0) {
952 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
953 * so do not allow connection to be terminated yet. */
954 ret->methodState = METHOD_CONT;
955 ret->decision = DECISION_COND_SUCC;
956 } else {
957 /* EAP-TTLS/CHAP does not provide tunneled success
958 * notification, so assume that Phase2 succeeds. */
959 ret->methodState = METHOD_DONE;
960 ret->decision = DECISION_COND_SUCC;
961 }
962
963 return 0;
964 }
965
966
967 static int eap_ttls_phase2_request(struct eap_sm *sm,
968 struct eap_ttls_data *data,
969 struct eap_method_ret *ret,
970 const struct eap_hdr *req,
971 struct eap_hdr *hdr,
972 u8 **resp, size_t *resp_len)
973 {
974 int res = 0;
975 size_t len;
976
977 if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
978 data->phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
979 data->phase2_type == EAP_TTLS_PHASE2_PAP ||
980 data->phase2_type == EAP_TTLS_PHASE2_CHAP) {
981 if (eap_get_config_identity(sm, &len) == NULL) {
982 wpa_printf(MSG_INFO,
983 "EAP-TTLS: Identity not configured");
984 eap_sm_request_identity(sm);
985 if (eap_get_config_password(sm, &len) == NULL)
986 eap_sm_request_password(sm);
987 return 0;
988 }
989
990 if (eap_get_config_password(sm, &len) == NULL) {
991 wpa_printf(MSG_INFO,
992 "EAP-TTLS: Password not configured");
993 eap_sm_request_password(sm);
994 return 0;
995 }
996 }
997
998 switch (data->phase2_type) {
999 case EAP_TTLS_PHASE2_EAP:
1000 res = eap_ttls_phase2_request_eap(sm, data, ret, hdr,
1001 resp, resp_len);
1002 break;
1003 case EAP_TTLS_PHASE2_MSCHAPV2:
1004 res = eap_ttls_phase2_request_mschapv2(sm, data, ret,
1005 resp, resp_len);
1006 break;
1007 case EAP_TTLS_PHASE2_MSCHAP:
1008 res = eap_ttls_phase2_request_mschap(sm, data, ret,
1009 resp, resp_len);
1010 break;
1011 case EAP_TTLS_PHASE2_PAP:
1012 res = eap_ttls_phase2_request_pap(sm, data, ret,
1013 resp, resp_len);
1014 break;
1015 case EAP_TTLS_PHASE2_CHAP:
1016 res = eap_ttls_phase2_request_chap(sm, data, ret,
1017 resp, resp_len);
1018 break;
1019 default:
1020 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
1021 res = -1;
1022 break;
1023 }
1024
1025 if (res < 0) {
1026 ret->methodState = METHOD_DONE;
1027 ret->decision = DECISION_FAIL;
1028 }
1029
1030 return res;
1031 }
1032
1033
1034 static u8 * eap_ttls_build_phase_finished(struct eap_sm *sm,
1035 struct eap_ttls_data *data,
1036 int id, int final,
1037 size_t *reqDataLen)
1038 {
1039 int len;
1040 struct eap_hdr *req;
1041 u8 *pos;
1042 const int max_len = 300;
1043
1044 len = sizeof(struct eap_hdr) + 2 + max_len;
1045 req = os_malloc(len);
1046 if (req == NULL)
1047 return NULL;
1048
1049 req->code = EAP_CODE_RESPONSE;
1050 req->identifier = id;
1051
1052 pos = (u8 *) (req + 1);
1053 *pos++ = EAP_TYPE_TTLS;
1054 *pos++ = data->ttls_version;
1055
1056 len = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
1057 data->ssl.conn,
1058 final, pos, max_len);
1059 if (len < 0) {
1060 os_free(req);
1061 return NULL;
1062 }
1063
1064 *reqDataLen = sizeof(struct eap_hdr) + 2 + len;
1065 req->length = host_to_be16(*reqDataLen);
1066
1067 return (u8 *) req;
1068 }
1069
1070
1071 static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
1072 struct eap_method_ret *ret,
1073 const struct eap_hdr *req,
1074 const u8 *in_data, size_t in_len,
1075 u8 **out_data, size_t *out_len)
1076 {
1077 u8 *in_decrypted = NULL, *pos;
1078 int res, retval = 0;
1079 struct eap_hdr *hdr = NULL;
1080 u8 *resp = NULL, *mschapv2 = NULL, *eapdata = NULL;
1081 size_t resp_len, eap_len = 0, len_decrypted = 0, len, buf_len, left;
1082 struct ttls_avp *avp;
1083 u8 recv_response[20];
1084 int mschapv2_error = 0;
1085 struct wpa_ssid *config = eap_get_config(sm);
1086 const u8 *msg;
1087 size_t msg_len;
1088 int need_more_input;
1089
1090 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1091 " Phase 2", (unsigned long) in_len);
1092
1093 if (data->pending_phase2_req) {
1094 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
1095 "skip decryption and use old data");
1096 /* Clear TLS reassembly state. */
1097 os_free(data->ssl.tls_in);
1098 data->ssl.tls_in = NULL;
1099 data->ssl.tls_in_len = 0;
1100 data->ssl.tls_in_left = 0;
1101 data->ssl.tls_in_total = 0;
1102
1103 in_decrypted = data->pending_phase2_req;
1104 data->pending_phase2_req = NULL;
1105 len_decrypted = data->pending_phase2_req_len;
1106 if (data->pending_phase2_req_len == 0) {
1107 os_free(in_decrypted);
1108 in_decrypted = NULL;
1109 goto fake_req_identity;
1110 }
1111 goto continue_req;
1112 }
1113
1114 if (in_len == 0 && data->phase2_start) {
1115 data->phase2_start = 0;
1116 /* EAP-TTLS does not use Phase2 on fast re-auth; this must be
1117 * done only if TLS part was indeed resuming a previous
1118 * session. Most Authentication Servers terminate EAP-TTLS
1119 * before reaching this point, but some do not. Make
1120 * wpa_supplicant stop phase 2 here, if needed. */
1121 if (data->reauth &&
1122 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
1123 wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
1124 "skip phase 2");
1125 *out_data = eap_tls_build_ack(&data->ssl, out_len,
1126 req->identifier,
1127 EAP_TYPE_TTLS, 0);
1128 ret->methodState = METHOD_DONE;
1129 ret->decision = DECISION_UNCOND_SUCC;
1130 data->phase2_success = 1;
1131 return 0;
1132 }
1133 fake_req_identity:
1134 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
1135 "Phase 2 - use fake EAP-Request Identity");
1136 buf_len = sizeof(*hdr) + 1;
1137 in_decrypted = os_malloc(buf_len);
1138 if (in_decrypted == NULL) {
1139 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
1140 "memory for fake EAP-Identity Request");
1141 retval = -1;
1142 goto done;
1143 }
1144 hdr = (struct eap_hdr *) in_decrypted;
1145 hdr->code = EAP_CODE_REQUEST;
1146 hdr->identifier = 0;
1147 hdr->length = host_to_be16(sizeof(*hdr) + 1);
1148 in_decrypted[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
1149 goto process_eap;
1150 }
1151
1152 msg = eap_tls_data_reassemble(sm, &data->ssl, in_data, in_len,
1153 &msg_len, &need_more_input);
1154 if (msg == NULL)
1155 return need_more_input ? 1 : -1;
1156
1157 buf_len = in_len;
1158 if (data->ssl.tls_in_total > buf_len)
1159 buf_len = data->ssl.tls_in_total;
1160 in_decrypted = os_malloc(buf_len);
1161 if (in_decrypted == NULL) {
1162 os_free(data->ssl.tls_in);
1163 data->ssl.tls_in = NULL;
1164 data->ssl.tls_in_len = 0;
1165 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
1166 "for decryption");
1167 retval = -1;
1168 goto done;
1169 }
1170
1171 res = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1172 msg, msg_len, in_decrypted, buf_len);
1173 os_free(data->ssl.tls_in);
1174 data->ssl.tls_in = NULL;
1175 data->ssl.tls_in_len = 0;
1176 if (res < 0) {
1177 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
1178 "data");
1179 retval = -1;
1180 goto done;
1181 }
1182 len_decrypted = res;
1183
1184 if (data->ttls_version > 0 && len_decrypted == 0 &&
1185 tls_connection_ia_final_phase_finished(sm->ssl_ctx,
1186 data->ssl.conn)) {
1187 wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received");
1188 wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication "
1189 "succeeded");
1190 ret->methodState = METHOD_DONE;
1191 ret->decision = DECISION_UNCOND_SUCC;
1192 data->phase2_success = 1;
1193 *out_data = eap_ttls_build_phase_finished(sm, data,
1194 req->identifier, 1,
1195 out_len);
1196 eap_ttls_v1_derive_key(sm, data);
1197 goto done;
1198 }
1199
1200 continue_req:
1201 data->phase2_start = 0;
1202
1203 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs",
1204 in_decrypted, len_decrypted);
1205 if (len_decrypted < sizeof(struct ttls_avp)) {
1206 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
1207 " len=%lu expected %lu or more - dropped",
1208 (unsigned long) len_decrypted,
1209 (unsigned long) sizeof(struct ttls_avp));
1210 retval = -1;
1211 goto done;
1212 }
1213
1214 /* Parse AVPs */
1215 pos = in_decrypted;
1216 left = len_decrypted;
1217 mschapv2 = NULL;
1218
1219 while (left > 0) {
1220 u32 avp_code, avp_length, vendor_id = 0;
1221 u8 avp_flags, *dpos;
1222 size_t pad, dlen;
1223 avp = (struct ttls_avp *) pos;
1224 avp_code = be_to_host32(avp->avp_code);
1225 avp_length = be_to_host32(avp->avp_length);
1226 avp_flags = (avp_length >> 24) & 0xff;
1227 avp_length &= 0xffffff;
1228 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
1229 "length=%d", (int) avp_code, avp_flags,
1230 (int) avp_length);
1231 if (avp_length > left) {
1232 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
1233 "(len=%d, left=%lu) - dropped",
1234 (int) avp_length, (unsigned long) left);
1235 retval = -1;
1236 goto done;
1237 }
1238 if (avp_length < sizeof(*avp)) {
1239 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length "
1240 "%d", avp_length);
1241 retval = -1;
1242 goto done;
1243 }
1244 dpos = (u8 *) (avp + 1);
1245 dlen = avp_length - sizeof(*avp);
1246 if (avp_flags & AVP_FLAGS_VENDOR) {
1247 if (dlen < 4) {
1248 wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
1249 "underflow");
1250 retval = -1;
1251 goto done;
1252 }
1253 vendor_id = be_to_host32(* (u32 *) dpos);
1254 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
1255 (int) vendor_id);
1256 dpos += 4;
1257 dlen -= 4;
1258 }
1259
1260 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
1261
1262 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
1263 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
1264 if (eapdata == NULL) {
1265 eapdata = os_malloc(dlen);
1266 if (eapdata == NULL) {
1267 retval = -1;
1268 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1269 "failed to allocate memory "
1270 "for Phase 2 EAP data");
1271 goto done;
1272 }
1273 os_memcpy(eapdata, dpos, dlen);
1274 eap_len = dlen;
1275 } else {
1276 u8 *neweap = os_realloc(eapdata,
1277 eap_len + dlen);
1278 if (neweap == NULL) {
1279 retval = -1;
1280 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1281 "failed to allocate memory "
1282 "for Phase 2 EAP data");
1283 goto done;
1284 }
1285 os_memcpy(neweap + eap_len, dpos, dlen);
1286 eapdata = neweap;
1287 eap_len += dlen;
1288 }
1289 } else if (vendor_id == 0 &&
1290 avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
1291 /* This is an optional message that can be displayed to
1292 * the user. */
1293 wpa_hexdump_ascii(MSG_DEBUG,
1294 "EAP-TTLS: AVP - Reply-Message",
1295 dpos, dlen);
1296 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
1297 avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
1298 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
1299 "MS-CHAP2-Success", dpos, dlen);
1300 if (dlen != 43) {
1301 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
1302 "MS-CHAP2-Success length "
1303 "(len=%lu, expected 43)",
1304 (unsigned long) dlen);
1305 retval = -1;
1306 break;
1307 }
1308 mschapv2 = dpos;
1309 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
1310 avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
1311 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
1312 "MS-CHAP-Error", dpos, dlen);
1313 mschapv2_error = 1;
1314 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
1315 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
1316 "mandatory AVP code %d vendor_id %d - "
1317 "dropped", (int) avp_code, (int) vendor_id);
1318 retval = -1;
1319 goto done;
1320 } else {
1321 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported "
1322 "AVP code %d vendor_id %d",
1323 (int) avp_code, (int) vendor_id);
1324 }
1325
1326 pad = (4 - (avp_length & 3)) & 3;
1327 pos += avp_length + pad;
1328 if (left < avp_length + pad)
1329 left = 0;
1330 else
1331 left -= avp_length + pad;
1332 }
1333
1334 switch (data->phase2_type) {
1335 case EAP_TTLS_PHASE2_EAP:
1336 if (eapdata == NULL) {
1337 wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in "
1338 "the packet - dropped");
1339 retval = -1;
1340 goto done;
1341 }
1342
1343 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1344 eapdata, eap_len);
1345 hdr = (struct eap_hdr *) eapdata;
1346
1347 if (eap_len < sizeof(*hdr)) {
1348 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 "
1349 "EAP frame (len=%lu, expected %lu or more) "
1350 "- dropped", (unsigned long) eap_len,
1351 (unsigned long) sizeof(*hdr));
1352 retval = -1;
1353 goto done;
1354 }
1355 len = be_to_host16(hdr->length);
1356 if (len > eap_len) {
1357 wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in "
1358 "Phase 2 EAP frame (EAP hdr len=%lu, EAP "
1359 "data len in AVP=%lu)",
1360 (unsigned long) len,
1361 (unsigned long) eap_len);
1362 retval = -1;
1363 goto done;
1364 }
1365 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1366 "identifier=%d length=%lu",
1367 hdr->code, hdr->identifier, (unsigned long) len);
1368 process_eap:
1369 switch (hdr->code) {
1370 case EAP_CODE_REQUEST:
1371 if (eap_ttls_phase2_request(sm, data, ret, req, hdr,
1372 &resp, &resp_len)) {
1373 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 "
1374 "Request processing failed");
1375 retval = -1;
1376 goto done;
1377 }
1378 break;
1379 default:
1380 wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1381 "Phase 2 EAP header", hdr->code);
1382 retval = -1;
1383 break;
1384 }
1385 break;
1386 case EAP_TTLS_PHASE2_MSCHAPV2:
1387 if (mschapv2_error) {
1388 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1389 "MS-CHAP-Error - failed");
1390 ret->methodState = METHOD_DONE;
1391 ret->decision = DECISION_FAIL;
1392 *out_data = eap_tls_build_ack(&data->ssl, out_len,
1393 req->identifier,
1394 EAP_TYPE_TTLS, 0);
1395 break;
1396 }
1397
1398 if (mschapv2 == NULL) {
1399 wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success"
1400 " AVP received for Phase2 MSCHAPV2");
1401 retval = -1;
1402 break;
1403 }
1404 if (mschapv2[0] != data->ident) {
1405 wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch "
1406 "for Phase 2 MSCHAPV2 (received Ident "
1407 "0x%02x, expected 0x%02x)",
1408 mschapv2[0], data->ident);
1409 retval = -1;
1410 break;
1411 }
1412 if (!data->auth_response_valid ||
1413 mschapv2[1] != 'S' || mschapv2[2] != '=' ||
1414 hexstr2bin((char *) (mschapv2 + 3), recv_response, 20) ||
1415 os_memcmp(data->auth_response, recv_response, 20) != 0) {
1416 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid "
1417 "authenticator response in Phase 2 "
1418 "MSCHAPV2 success request");
1419 retval = -1;
1420 break;
1421 }
1422
1423 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1424 "authentication succeeded");
1425 if (data->ttls_version > 0) {
1426 /* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report
1427 * success, so do not allow connection to be terminated
1428 * yet. */
1429 ret->methodState = METHOD_CONT;
1430 ret->decision = DECISION_COND_SUCC;
1431 } else {
1432 ret->methodState = METHOD_DONE;
1433 ret->decision = DECISION_UNCOND_SUCC;
1434 data->phase2_success = 1;
1435 }
1436
1437 /* Reply with empty data; authentication server will reply
1438 * with EAP-Success after this. */
1439 retval = 1;
1440 goto done;
1441 case EAP_TTLS_PHASE2_MSCHAP:
1442 case EAP_TTLS_PHASE2_PAP:
1443 case EAP_TTLS_PHASE2_CHAP:
1444 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1445 * requests to the supplicant */
1446 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1447 "tunneled data");
1448 retval = -1;
1449 break;
1450 }
1451
1452 if (resp) {
1453 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
1454 resp, resp_len);
1455
1456 if (eap_ttls_encrypt(sm, data, req->identifier,
1457 resp, resp_len, out_data, out_len)) {
1458 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt "
1459 "a Phase 2 frame");
1460 }
1461 os_free(resp);
1462 } else if (config->pending_req_identity ||
1463 config->pending_req_password ||
1464 config->pending_req_otp ||
1465 config->pending_req_new_password) {
1466 os_free(data->pending_phase2_req);
1467 data->pending_phase2_req = os_malloc(len_decrypted);
1468 if (data->pending_phase2_req) {
1469 os_memcpy(data->pending_phase2_req, in_decrypted,
1470 len_decrypted);
1471 data->pending_phase2_req_len = len_decrypted;
1472 }
1473 }
1474
1475 done:
1476 os_free(in_decrypted);
1477 os_free(eapdata);
1478
1479 if (retval < 0) {
1480 ret->methodState = METHOD_DONE;
1481 ret->decision = DECISION_FAIL;
1482 }
1483
1484 return retval;
1485 }
1486
1487
1488 static u8 * eap_ttls_process(struct eap_sm *sm, void *priv,
1489 struct eap_method_ret *ret,
1490 const u8 *reqData, size_t reqDataLen,
1491 size_t *respDataLen)
1492 {
1493 const struct eap_hdr *req;
1494 size_t left;
1495 int res;
1496 u8 flags, *resp, id;
1497 const u8 *pos;
1498 struct eap_ttls_data *data = priv;
1499 struct wpa_ssid *config = eap_get_config(sm);
1500
1501 pos = eap_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
1502 reqData, reqDataLen, &left, &flags);
1503 if (pos == NULL)
1504 return NULL;
1505 req = (const struct eap_hdr *) reqData;
1506 id = req->identifier;
1507
1508 if (flags & EAP_TLS_FLAGS_START) {
1509 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own "
1510 "ver=%d)", flags & EAP_PEAP_VERSION_MASK,
1511 data->ttls_version);
1512 if ((flags & EAP_PEAP_VERSION_MASK) < data->ttls_version)
1513 data->ttls_version = flags & EAP_PEAP_VERSION_MASK;
1514 if (data->force_ttls_version >= 0 &&
1515 data->force_ttls_version != data->ttls_version) {
1516 wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to select "
1517 "forced TTLS version %d",
1518 data->force_ttls_version);
1519 ret->methodState = METHOD_DONE;
1520 ret->decision = DECISION_FAIL;
1521 ret->allowNotifications = FALSE;
1522 return NULL;
1523 }
1524 wpa_printf(MSG_DEBUG, "EAP-TTLS: Using TTLS version %d",
1525 data->ttls_version);
1526
1527 if (data->ttls_version > 0)
1528 data->ssl.tls_ia = 1;
1529 if (!data->ssl_initialized &&
1530 eap_tls_ssl_init(sm, &data->ssl, config)) {
1531 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize "
1532 "SSL.");
1533 return NULL;
1534 }
1535 data->ssl_initialized = 1;
1536
1537 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");
1538 /* draft-ietf-pppext-eap-ttls-03.txt, Ch. 8.1:
1539 * EAP-TTLS Start packet may, in a future specification, be
1540 * allowed to contain data. Client based on this draft version
1541 * must ignore such data but must not reject the Start packet.
1542 */
1543 left = 0;
1544 } else if (!data->ssl_initialized) {
1545 wpa_printf(MSG_DEBUG, "EAP-TTLS: First message did not "
1546 "include Start flag");
1547 ret->methodState = METHOD_DONE;
1548 ret->decision = DECISION_FAIL;
1549 ret->allowNotifications = FALSE;
1550 return NULL;
1551 }
1552
1553 resp = NULL;
1554 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1555 !data->resuming) {
1556 res = eap_ttls_decrypt(sm, data, ret, req, pos, left,
1557 &resp, respDataLen);
1558 } else {
1559 res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
1560 data->ttls_version, id, pos, left,
1561 &resp, respDataLen);
1562
1563 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1564 wpa_printf(MSG_DEBUG,
1565 "EAP-TTLS: TLS done, proceed to Phase 2");
1566 if (data->resuming) {
1567 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth -"
1568 " may skip Phase 2");
1569 ret->decision = DECISION_COND_SUCC;
1570 ret->methodState = METHOD_MAY_CONT;
1571 }
1572 data->phase2_start = 1;
1573 if (data->ttls_version == 0)
1574 eap_ttls_v0_derive_key(sm, data);
1575
1576 if (*respDataLen == 0) {
1577 if (eap_ttls_decrypt(sm, data, ret, req, NULL,
1578 0, &resp, respDataLen)) {
1579 wpa_printf(MSG_WARNING, "EAP-TTLS: "
1580 "failed to process early "
1581 "start for Phase 2");
1582 }
1583 res = 0;
1584 }
1585 data->resuming = 0;
1586 }
1587
1588 if (res == 2) {
1589 /*
1590 * Application data included in the handshake message.
1591 */
1592 os_free(data->pending_phase2_req);
1593 data->pending_phase2_req = resp;
1594 data->pending_phase2_req_len = *respDataLen;
1595 resp = NULL;
1596 *respDataLen = 0;
1597 res = eap_ttls_decrypt(sm, data, ret, req, pos, left,
1598 &resp, respDataLen);
1599 }
1600 }
1601
1602 if (data->ttls_version == 0 && ret->methodState == METHOD_DONE) {
1603 ret->allowNotifications = FALSE;
1604 if (ret->decision == DECISION_UNCOND_SUCC ||
1605 ret->decision == DECISION_COND_SUCC) {
1606 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1607 "completed successfully");
1608 data->phase2_success = 1;
1609 }
1610 } else if (data->ttls_version == 0 && sm->workaround &&
1611 ret->methodState == METHOD_MAY_CONT &&
1612 (ret->decision == DECISION_UNCOND_SUCC ||
1613 ret->decision == DECISION_COND_SUCC)) {
1614 wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1615 "completed successfully (EAP workaround)");
1616 data->phase2_success = 1;
1617 }
1618
1619 if (res == 1) {
1620 return eap_tls_build_ack(&data->ssl, respDataLen, id,
1621 EAP_TYPE_TTLS, data->ttls_version);
1622 }
1623 return resp;
1624 }
1625
1626
1627 static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1628 {
1629 struct eap_ttls_data *data = priv;
1630 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1631 data->phase2_success;
1632 }
1633
1634
1635 static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1636 {
1637 struct eap_ttls_data *data = priv;
1638 os_free(data->pending_phase2_req);
1639 data->pending_phase2_req = NULL;
1640 }
1641
1642
1643 static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1644 {
1645 struct eap_ttls_data *data = priv;
1646 os_free(data->key_data);
1647 data->key_data = NULL;
1648 if (eap_tls_reauth_init(sm, &data->ssl)) {
1649 os_free(data);
1650 return NULL;
1651 }
1652 if (data->phase2_priv && data->phase2_method &&
1653 data->phase2_method->init_for_reauth)
1654 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1655 data->phase2_start = 0;
1656 data->phase2_success = 0;
1657 data->resuming = 1;
1658 data->reauth = 1;
1659 return priv;
1660 }
1661
1662
1663 static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1664 size_t buflen, int verbose)
1665 {
1666 struct eap_ttls_data *data = priv;
1667 int len, ret;
1668
1669 len = eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
1670 ret = os_snprintf(buf + len, buflen - len,
1671 "EAP-TTLSv%d Phase2 method=",
1672 data->ttls_version);
1673 if (ret < 0 || (size_t) ret >= buflen - len)
1674 return len;
1675 len += ret;
1676 switch (data->phase2_type) {
1677 case EAP_TTLS_PHASE2_EAP:
1678 ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
1679 data->phase2_method ?
1680 data->phase2_method->name : "?");
1681 break;
1682 case EAP_TTLS_PHASE2_MSCHAPV2:
1683 ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
1684 break;
1685 case EAP_TTLS_PHASE2_MSCHAP:
1686 ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
1687 break;
1688 case EAP_TTLS_PHASE2_PAP:
1689 ret = os_snprintf(buf + len, buflen - len, "PAP\n");
1690 break;
1691 case EAP_TTLS_PHASE2_CHAP:
1692 ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
1693 break;
1694 default:
1695 ret = 0;
1696 break;
1697 }
1698 if (ret < 0 || (size_t) ret >= buflen - len)
1699 return len;
1700 len += ret;
1701
1702 return len;
1703 }
1704
1705
1706 static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1707 {
1708 struct eap_ttls_data *data = priv;
1709 return data->key_data != NULL && data->phase2_success;
1710 }
1711
1712
1713 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1714 {
1715 struct eap_ttls_data *data = priv;
1716 u8 *key;
1717
1718 if (data->key_data == NULL || !data->phase2_success)
1719 return NULL;
1720
1721 key = os_malloc(EAP_TLS_KEY_LEN);
1722 if (key == NULL)
1723 return NULL;
1724
1725 *len = EAP_TLS_KEY_LEN;
1726 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1727
1728 return key;
1729 }
1730
1731
1732 int eap_peer_ttls_register(void)
1733 {
1734 struct eap_method *eap;
1735 int ret;
1736
1737 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1738 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1739 if (eap == NULL)
1740 return -1;
1741
1742 eap->init = eap_ttls_init;
1743 eap->deinit = eap_ttls_deinit;
1744 eap->process = eap_ttls_process;
1745 eap->isKeyAvailable = eap_ttls_isKeyAvailable;
1746 eap->getKey = eap_ttls_getKey;
1747 eap->get_status = eap_ttls_get_status;
1748 eap->has_reauth_data = eap_ttls_has_reauth_data;
1749 eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
1750 eap->init_for_reauth = eap_ttls_init_for_reauth;
1751
1752 ret = eap_peer_method_register(eap);
1753 if (ret)
1754 eap_peer_method_free(eap);
1755 return ret;
1756 }
DragonFly BSD