1 /*
2 * hostapd / EAP-TTLS (RFC 5281)
3 * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/ms_funcs.h"
13 #include "crypto/sha1.h"
14 #include "crypto/tls.h"
15 #include "eap_server/eap_i.h"
16 #include "eap_server/eap_tls_common.h"
17 #include "eap_common/chap.h"
18 #include "eap_common/eap_ttls.h"
19
20
21 #define EAP_TTLS_VERSION 0
22
23
24 static void eap_ttls_reset(struct eap_sm *sm, void *priv);
25
26
27 struct eap_ttls_data {
28 struct eap_ssl_data ssl;
29 enum {
30 START, PHASE1, PHASE2_START, PHASE2_METHOD,
31 PHASE2_MSCHAPV2_RESP, SUCCESS, FAILURE
32 } state;
33
34 int ttls_version;
35 const struct eap_method *phase2_method;
36 void *phase2_priv;
37 int mschapv2_resp_ok;
38 u8 mschapv2_auth_response[20];
39 u8 mschapv2_ident;
40 struct wpabuf *pending_phase2_eap_resp;
41 int tnc_started;
42 };
43
44
eap_ttls_state_txt(int state)45 static const char * eap_ttls_state_txt(int state)
46 {
47 switch (state) {
48 case START:
49 return "START";
50 case PHASE1:
51 return "PHASE1";
52 case PHASE2_START:
53 return "PHASE2_START";
54 case PHASE2_METHOD:
55 return "PHASE2_METHOD";
56 case PHASE2_MSCHAPV2_RESP:
57 return "PHASE2_MSCHAPV2_RESP";
58 case SUCCESS:
59 return "SUCCESS";
60 case FAILURE:
61 return "FAILURE";
62 default:
63 return "Unknown?!";
64 }
65 }
66
67
eap_ttls_state(struct eap_ttls_data * data,int state)68 static void eap_ttls_state(struct eap_ttls_data *data, int state)
69 {
70 wpa_printf(MSG_DEBUG, "EAP-TTLS: %s -> %s",
71 eap_ttls_state_txt(data->state),
72 eap_ttls_state_txt(state));
73 data->state = state;
74 if (state == FAILURE)
75 tls_connection_remove_session(data->ssl.conn);
76 }
77
78
eap_ttls_valid_session(struct eap_sm * sm,struct eap_ttls_data * data)79 static void eap_ttls_valid_session(struct eap_sm *sm,
80 struct eap_ttls_data *data)
81 {
82 struct wpabuf *buf;
83
84 if (!sm->cfg->tls_session_lifetime)
85 return;
86
87 buf = wpabuf_alloc(1 + 1 + sm->identity_len);
88 if (!buf)
89 return;
90 wpabuf_put_u8(buf, EAP_TYPE_TTLS);
91 if (sm->identity) {
92 u8 id_len;
93
94 if (sm->identity_len <= 255)
95 id_len = sm->identity_len;
96 else
97 id_len = 255;
98 wpabuf_put_u8(buf, id_len);
99 wpabuf_put_data(buf, sm->identity, id_len);
100 } else {
101 wpabuf_put_u8(buf, 0);
102 }
103 tls_connection_set_success_data(data->ssl.conn, buf);
104 }
105
106
eap_ttls_avp_hdr(u8 * avphdr,u32 avp_code,u32 vendor_id,int mandatory,size_t len)107 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
108 int mandatory, size_t len)
109 {
110 struct ttls_avp_vendor *avp;
111 u8 flags;
112 size_t hdrlen;
113
114 avp = (struct ttls_avp_vendor *) avphdr;
115 flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
116 if (vendor_id) {
117 flags |= AVP_FLAGS_VENDOR;
118 hdrlen = sizeof(*avp);
119 avp->vendor_id = host_to_be32(vendor_id);
120 } else {
121 hdrlen = sizeof(struct ttls_avp);
122 }
123
124 avp->avp_code = host_to_be32(avp_code);
125 avp->avp_length = host_to_be32(((u32) flags << 24) |
126 ((u32) (hdrlen + len)));
127
128 return avphdr + hdrlen;
129 }
130
131
eap_ttls_avp_encapsulate(struct wpabuf * resp,u32 avp_code,int mandatory)132 static struct wpabuf * eap_ttls_avp_encapsulate(struct wpabuf *resp,
133 u32 avp_code, int mandatory)
134 {
135 struct wpabuf *avp;
136 u8 *pos;
137
138 avp = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(resp) + 4);
139 if (avp == NULL) {
140 wpabuf_free(resp);
141 return NULL;
142 }
143
144 pos = eap_ttls_avp_hdr(wpabuf_mhead(avp), avp_code, 0, mandatory,
145 wpabuf_len(resp));
146 os_memcpy(pos, wpabuf_head(resp), wpabuf_len(resp));
147 pos += wpabuf_len(resp);
148 AVP_PAD((const u8 *) wpabuf_head(avp), pos);
149 wpabuf_free(resp);
150 wpabuf_put(avp, pos - (u8 *) wpabuf_head(avp));
151 return avp;
152 }
153
154
155 struct eap_ttls_avp {
156 /* Note: eap is allocated memory; caller is responsible for freeing
157 * it. All the other pointers are pointing to the packet data, i.e.,
158 * they must not be freed separately. */
159 u8 *eap;
160 size_t eap_len;
161 u8 *user_name;
162 size_t user_name_len;
163 u8 *user_password;
164 size_t user_password_len;
165 u8 *chap_challenge;
166 size_t chap_challenge_len;
167 u8 *chap_password;
168 size_t chap_password_len;
169 u8 *mschap_challenge;
170 size_t mschap_challenge_len;
171 u8 *mschap_response;
172 size_t mschap_response_len;
173 u8 *mschap2_response;
174 size_t mschap2_response_len;
175 };
176
177
eap_ttls_avp_parse(struct wpabuf * buf,struct eap_ttls_avp * parse)178 static int eap_ttls_avp_parse(struct wpabuf *buf, struct eap_ttls_avp *parse)
179 {
180 struct ttls_avp *avp;
181 u8 *pos;
182 int left;
183
184 pos = wpabuf_mhead(buf);
185 left = wpabuf_len(buf);
186 os_memset(parse, 0, sizeof(*parse));
187
188 while (left > 0) {
189 u32 avp_code, avp_length, vendor_id = 0;
190 u8 avp_flags, *dpos;
191 size_t pad, dlen;
192 avp = (struct ttls_avp *) pos;
193 avp_code = be_to_host32(avp->avp_code);
194 avp_length = be_to_host32(avp->avp_length);
195 avp_flags = (avp_length >> 24) & 0xff;
196 avp_length &= 0xffffff;
197 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
198 "length=%d", (int) avp_code, avp_flags,
199 (int) avp_length);
200 if ((int) avp_length > left) {
201 wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
202 "(len=%d, left=%d) - dropped",
203 (int) avp_length, left);
204 goto fail;
205 }
206 if (avp_length < sizeof(*avp)) {
207 wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length "
208 "%d", avp_length);
209 goto fail;
210 }
211 dpos = (u8 *) (avp + 1);
212 dlen = avp_length - sizeof(*avp);
213 if (avp_flags & AVP_FLAGS_VENDOR) {
214 if (dlen < 4) {
215 wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
216 "underflow");
217 goto fail;
218 }
219 vendor_id = be_to_host32(* (be32 *) dpos);
220 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
221 (int) vendor_id);
222 dpos += 4;
223 dlen -= 4;
224 }
225
226 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
227
228 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
229 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
230 if (parse->eap == NULL) {
231 parse->eap = os_memdup(dpos, dlen);
232 if (parse->eap == NULL) {
233 wpa_printf(MSG_WARNING, "EAP-TTLS: "
234 "failed to allocate memory "
235 "for Phase 2 EAP data");
236 goto fail;
237 }
238 parse->eap_len = dlen;
239 } else {
240 u8 *neweap = os_realloc(parse->eap,
241 parse->eap_len + dlen);
242 if (neweap == NULL) {
243 wpa_printf(MSG_WARNING, "EAP-TTLS: "
244 "failed to allocate memory "
245 "for Phase 2 EAP data");
246 goto fail;
247 }
248 os_memcpy(neweap + parse->eap_len, dpos, dlen);
249 parse->eap = neweap;
250 parse->eap_len += dlen;
251 }
252 } else if (vendor_id == 0 &&
253 avp_code == RADIUS_ATTR_USER_NAME) {
254 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: User-Name",
255 dpos, dlen);
256 parse->user_name = dpos;
257 parse->user_name_len = dlen;
258 } else if (vendor_id == 0 &&
259 avp_code == RADIUS_ATTR_USER_PASSWORD) {
260 u8 *password = dpos;
261 size_t password_len = dlen;
262 while (password_len > 0 &&
263 password[password_len - 1] == '\0') {
264 password_len--;
265 }
266 wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: "
267 "User-Password (PAP)",
268 password, password_len);
269 parse->user_password = password;
270 parse->user_password_len = password_len;
271 } else if (vendor_id == 0 &&
272 avp_code == RADIUS_ATTR_CHAP_CHALLENGE) {
273 wpa_hexdump(MSG_DEBUG,
274 "EAP-TTLS: CHAP-Challenge (CHAP)",
275 dpos, dlen);
276 parse->chap_challenge = dpos;
277 parse->chap_challenge_len = dlen;
278 } else if (vendor_id == 0 &&
279 avp_code == RADIUS_ATTR_CHAP_PASSWORD) {
280 wpa_hexdump(MSG_DEBUG,
281 "EAP-TTLS: CHAP-Password (CHAP)",
282 dpos, dlen);
283 parse->chap_password = dpos;
284 parse->chap_password_len = dlen;
285 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
286 avp_code == RADIUS_ATTR_MS_CHAP_CHALLENGE) {
287 wpa_hexdump(MSG_DEBUG,
288 "EAP-TTLS: MS-CHAP-Challenge",
289 dpos, dlen);
290 parse->mschap_challenge = dpos;
291 parse->mschap_challenge_len = dlen;
292 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
293 avp_code == RADIUS_ATTR_MS_CHAP_RESPONSE) {
294 wpa_hexdump(MSG_DEBUG,
295 "EAP-TTLS: MS-CHAP-Response (MSCHAP)",
296 dpos, dlen);
297 parse->mschap_response = dpos;
298 parse->mschap_response_len = dlen;
299 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
300 avp_code == RADIUS_ATTR_MS_CHAP2_RESPONSE) {
301 wpa_hexdump(MSG_DEBUG,
302 "EAP-TTLS: MS-CHAP2-Response (MSCHAPV2)",
303 dpos, dlen);
304 parse->mschap2_response = dpos;
305 parse->mschap2_response_len = dlen;
306 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
307 wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
308 "mandatory AVP code %d vendor_id %d - "
309 "dropped", (int) avp_code, (int) vendor_id);
310 goto fail;
311 } else {
312 wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported "
313 "AVP code %d vendor_id %d",
314 (int) avp_code, (int) vendor_id);
315 }
316
317 pad = (4 - (avp_length & 3)) & 3;
318 pos += avp_length + pad;
319 left -= avp_length + pad;
320 }
321
322 return 0;
323
324 fail:
325 os_free(parse->eap);
326 parse->eap = NULL;
327 return -1;
328 }
329
330
eap_ttls_implicit_challenge(struct eap_sm * sm,struct eap_ttls_data * data,size_t len)331 static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
332 struct eap_ttls_data *data, size_t len)
333 {
334 return eap_server_tls_derive_key(sm, &data->ssl, "ttls challenge",
335 NULL, 0, len);
336 }
337
338
eap_ttls_init(struct eap_sm * sm)339 static void * eap_ttls_init(struct eap_sm *sm)
340 {
341 struct eap_ttls_data *data;
342
343 data = os_zalloc(sizeof(*data));
344 if (data == NULL)
345 return NULL;
346 data->ttls_version = EAP_TTLS_VERSION;
347 data->state = START;
348
349 if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_TTLS)) {
350 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
351 eap_ttls_reset(sm, data);
352 return NULL;
353 }
354
355 return data;
356 }
357
358
eap_ttls_reset(struct eap_sm * sm,void * priv)359 static void eap_ttls_reset(struct eap_sm *sm, void *priv)
360 {
361 struct eap_ttls_data *data = priv;
362 if (data == NULL)
363 return;
364 if (data->phase2_priv && data->phase2_method)
365 data->phase2_method->reset(sm, data->phase2_priv);
366 eap_server_tls_ssl_deinit(sm, &data->ssl);
367 wpabuf_free(data->pending_phase2_eap_resp);
368 bin_clear_free(data, sizeof(*data));
369 }
370
371
eap_ttls_build_start(struct eap_sm * sm,struct eap_ttls_data * data,u8 id)372 static struct wpabuf * eap_ttls_build_start(struct eap_sm *sm,
373 struct eap_ttls_data *data, u8 id)
374 {
375 struct wpabuf *req;
376
377 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1,
378 EAP_CODE_REQUEST, id);
379 if (req == NULL) {
380 wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to allocate memory for"
381 " request");
382 eap_ttls_state(data, FAILURE);
383 return NULL;
384 }
385
386 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->ttls_version);
387
388 eap_ttls_state(data, PHASE1);
389
390 return req;
391 }
392
393
eap_ttls_build_phase2_eap_req(struct eap_sm * sm,struct eap_ttls_data * data,u8 id)394 static struct wpabuf * eap_ttls_build_phase2_eap_req(
395 struct eap_sm *sm, struct eap_ttls_data *data, u8 id)
396 {
397 struct wpabuf *buf, *encr_req;
398
399
400 buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
401 if (buf == NULL)
402 return NULL;
403
404 wpa_hexdump_buf_key(MSG_DEBUG,
405 "EAP-TTLS/EAP: Encapsulate Phase 2 data", buf);
406
407 buf = eap_ttls_avp_encapsulate(buf, RADIUS_ATTR_EAP_MESSAGE, 1);
408 if (buf == NULL) {
409 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Failed to encapsulate "
410 "packet");
411 return NULL;
412 }
413
414 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated "
415 "Phase 2 data", buf);
416
417 encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
418 wpabuf_free(buf);
419
420 return encr_req;
421 }
422
423
eap_ttls_build_phase2_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data)424 static struct wpabuf * eap_ttls_build_phase2_mschapv2(
425 struct eap_sm *sm, struct eap_ttls_data *data)
426 {
427 struct wpabuf *encr_req, msgbuf;
428 u8 *req, *pos, *end;
429 int ret;
430
431 pos = req = os_malloc(100);
432 if (req == NULL)
433 return NULL;
434 end = req + 100;
435
436 if (data->mschapv2_resp_ok) {
437 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_SUCCESS,
438 RADIUS_VENDOR_ID_MICROSOFT, 1, 43);
439 *pos++ = data->mschapv2_ident;
440 ret = os_snprintf((char *) pos, end - pos, "S=");
441 if (!os_snprintf_error(end - pos, ret))
442 pos += ret;
443 pos += wpa_snprintf_hex_uppercase(
444 (char *) pos, end - pos, data->mschapv2_auth_response,
445 sizeof(data->mschapv2_auth_response));
446 } else {
447 pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_ERROR,
448 RADIUS_VENDOR_ID_MICROSOFT, 1, 6);
449 os_memcpy(pos, "Failed", 6);
450 pos += 6;
451 AVP_PAD(req, pos);
452 }
453
454 wpabuf_set(&msgbuf, req, pos - req);
455 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
456 "data", &msgbuf);
457
458 encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
459 os_free(req);
460
461 return encr_req;
462 }
463
464
eap_ttls_buildReq(struct eap_sm * sm,void * priv,u8 id)465 static struct wpabuf * eap_ttls_buildReq(struct eap_sm *sm, void *priv, u8 id)
466 {
467 struct eap_ttls_data *data = priv;
468
469 if (data->ssl.state == FRAG_ACK) {
470 return eap_server_tls_build_ack(id, EAP_TYPE_TTLS,
471 data->ttls_version);
472 }
473
474 if (data->ssl.state == WAIT_FRAG_ACK) {
475 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
476 data->ttls_version, id);
477 }
478
479 switch (data->state) {
480 case START:
481 return eap_ttls_build_start(sm, data, id);
482 case PHASE1:
483 if (tls_connection_established(sm->cfg->ssl_ctx,
484 data->ssl.conn)) {
485 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase1 done, "
486 "starting Phase2");
487 eap_ttls_state(data, PHASE2_START);
488 }
489 break;
490 case PHASE2_METHOD:
491 wpabuf_free(data->ssl.tls_out);
492 data->ssl.tls_out_pos = 0;
493 data->ssl.tls_out = eap_ttls_build_phase2_eap_req(sm, data,
494 id);
495 break;
496 case PHASE2_MSCHAPV2_RESP:
497 wpabuf_free(data->ssl.tls_out);
498 data->ssl.tls_out_pos = 0;
499 data->ssl.tls_out = eap_ttls_build_phase2_mschapv2(sm, data);
500 break;
501 default:
502 wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
503 __func__, data->state);
504 return NULL;
505 }
506
507 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
508 data->ttls_version, id);
509 }
510
511
eap_ttls_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)512 static bool eap_ttls_check(struct eap_sm *sm, void *priv,
513 struct wpabuf *respData)
514 {
515 const u8 *pos;
516 size_t len;
517
518 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TTLS, respData, &len);
519 if (pos == NULL || len < 1) {
520 wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame");
521 return true;
522 }
523
524 return false;
525 }
526
527
eap_ttls_process_phase2_pap(struct eap_sm * sm,struct eap_ttls_data * data,const u8 * user_password,size_t user_password_len)528 static void eap_ttls_process_phase2_pap(struct eap_sm *sm,
529 struct eap_ttls_data *data,
530 const u8 *user_password,
531 size_t user_password_len)
532 {
533 if (!sm->user || !sm->user->password || sm->user->password_hash ||
534 !(sm->user->ttls_auth & EAP_TTLS_AUTH_PAP)) {
535 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: No plaintext user "
536 "password configured");
537 eap_ttls_state(data, FAILURE);
538 return;
539 }
540
541 if (sm->user->password_len != user_password_len ||
542 os_memcmp_const(sm->user->password, user_password,
543 user_password_len) != 0) {
544 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: Invalid user password");
545 eap_ttls_state(data, FAILURE);
546 return;
547 }
548
549 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: Correct user password");
550 eap_ttls_state(data, SUCCESS);
551 eap_ttls_valid_session(sm, data);
552 }
553
554
eap_ttls_process_phase2_chap(struct eap_sm * sm,struct eap_ttls_data * data,const u8 * challenge,size_t challenge_len,const u8 * password,size_t password_len)555 static void eap_ttls_process_phase2_chap(struct eap_sm *sm,
556 struct eap_ttls_data *data,
557 const u8 *challenge,
558 size_t challenge_len,
559 const u8 *password,
560 size_t password_len)
561 {
562 u8 *chal, hash[CHAP_MD5_LEN];
563
564 if (challenge == NULL || password == NULL ||
565 challenge_len != EAP_TTLS_CHAP_CHALLENGE_LEN ||
566 password_len != 1 + EAP_TTLS_CHAP_PASSWORD_LEN) {
567 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Invalid CHAP attributes "
568 "(challenge len %lu password len %lu)",
569 (unsigned long) challenge_len,
570 (unsigned long) password_len);
571 eap_ttls_state(data, FAILURE);
572 return;
573 }
574
575 if (!sm->user || !sm->user->password || sm->user->password_hash ||
576 !(sm->user->ttls_auth & EAP_TTLS_AUTH_CHAP)) {
577 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: No plaintext user "
578 "password configured");
579 eap_ttls_state(data, FAILURE);
580 return;
581 }
582
583 chal = eap_ttls_implicit_challenge(sm, data,
584 EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
585 if (chal == NULL) {
586 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Failed to generate "
587 "challenge from TLS data");
588 eap_ttls_state(data, FAILURE);
589 return;
590 }
591
592 if (os_memcmp_const(challenge, chal, EAP_TTLS_CHAP_CHALLENGE_LEN)
593 != 0 ||
594 password[0] != chal[EAP_TTLS_CHAP_CHALLENGE_LEN]) {
595 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Challenge mismatch");
596 os_free(chal);
597 eap_ttls_state(data, FAILURE);
598 return;
599 }
600 os_free(chal);
601
602 /* MD5(Ident + Password + Challenge) */
603 chap_md5(password[0], sm->user->password, sm->user->password_len,
604 challenge, challenge_len, hash);
605
606 if (os_memcmp_const(hash, password + 1, EAP_TTLS_CHAP_PASSWORD_LEN) ==
607 0) {
608 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Correct user password");
609 eap_ttls_state(data, SUCCESS);
610 eap_ttls_valid_session(sm, data);
611 } else {
612 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Invalid user password");
613 eap_ttls_state(data, FAILURE);
614 }
615 }
616
617
eap_ttls_process_phase2_mschap(struct eap_sm * sm,struct eap_ttls_data * data,u8 * challenge,size_t challenge_len,u8 * response,size_t response_len)618 static void eap_ttls_process_phase2_mschap(struct eap_sm *sm,
619 struct eap_ttls_data *data,
620 u8 *challenge, size_t challenge_len,
621 u8 *response, size_t response_len)
622 {
623 u8 *chal, nt_response[24];
624
625 if (challenge == NULL || response == NULL ||
626 challenge_len != EAP_TTLS_MSCHAP_CHALLENGE_LEN ||
627 response_len != EAP_TTLS_MSCHAP_RESPONSE_LEN) {
628 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Invalid MS-CHAP "
629 "attributes (challenge len %lu response len %lu)",
630 (unsigned long) challenge_len,
631 (unsigned long) response_len);
632 eap_ttls_state(data, FAILURE);
633 return;
634 }
635
636 if (!sm->user || !sm->user->password ||
637 !(sm->user->ttls_auth & EAP_TTLS_AUTH_MSCHAP)) {
638 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: No user password "
639 "configured");
640 eap_ttls_state(data, FAILURE);
641 return;
642 }
643
644 chal = eap_ttls_implicit_challenge(sm, data,
645 EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
646 if (chal == NULL) {
647 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Failed to generate "
648 "challenge from TLS data");
649 eap_ttls_state(data, FAILURE);
650 return;
651 }
652
653 #ifdef CONFIG_TESTING_OPTIONS
654 eap_server_mschap_rx_callback(sm, "TTLS-MSCHAP",
655 sm->identity, sm->identity_len,
656 challenge, response + 2 + 24);
657 #endif /* CONFIG_TESTING_OPTIONS */
658
659 if (os_memcmp_const(challenge, chal, EAP_TTLS_MSCHAP_CHALLENGE_LEN)
660 != 0 ||
661 response[0] != chal[EAP_TTLS_MSCHAP_CHALLENGE_LEN]) {
662 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Challenge mismatch");
663 os_free(chal);
664 eap_ttls_state(data, FAILURE);
665 return;
666 }
667 os_free(chal);
668
669 if ((sm->user->password_hash &&
670 challenge_response(challenge, sm->user->password, nt_response)) ||
671 (!sm->user->password_hash &&
672 nt_challenge_response(challenge, sm->user->password,
673 sm->user->password_len, nt_response))) {
674 eap_ttls_state(data, FAILURE);
675 return;
676 }
677
678 if (os_memcmp_const(nt_response, response + 2 + 24, 24) == 0) {
679 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");
680 eap_ttls_state(data, SUCCESS);
681 eap_ttls_valid_session(sm, data);
682 } else {
683 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Invalid NT-Response");
684 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAP: Received",
685 response + 2 + 24, 24);
686 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAP: Expected",
687 nt_response, 24);
688 eap_ttls_state(data, FAILURE);
689 }
690 }
691
692
eap_ttls_process_phase2_mschapv2(struct eap_sm * sm,struct eap_ttls_data * data,u8 * challenge,size_t challenge_len,u8 * response,size_t response_len)693 static void eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
694 struct eap_ttls_data *data,
695 u8 *challenge,
696 size_t challenge_len,
697 u8 *response, size_t response_len)
698 {
699 u8 *chal, *username, nt_response[24], *rx_resp, *peer_challenge,
700 *auth_challenge;
701 size_t username_len, i;
702
703 if (challenge == NULL || response == NULL ||
704 challenge_len != EAP_TTLS_MSCHAPV2_CHALLENGE_LEN ||
705 response_len != EAP_TTLS_MSCHAPV2_RESPONSE_LEN) {
706 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Invalid MS-CHAP2 "
707 "attributes (challenge len %lu response len %lu)",
708 (unsigned long) challenge_len,
709 (unsigned long) response_len);
710 eap_ttls_state(data, FAILURE);
711 return;
712 }
713
714 if (!sm->user || !sm->user->password ||
715 !(sm->user->ttls_auth & EAP_TTLS_AUTH_MSCHAPV2)) {
716 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: No user password "
717 "configured");
718 eap_ttls_state(data, FAILURE);
719 return;
720 }
721
722 if (sm->identity == NULL) {
723 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: No user identity "
724 "known");
725 eap_ttls_state(data, FAILURE);
726 return;
727 }
728
729 /* MSCHAPv2 does not include optional domain name in the
730 * challenge-response calculation, so remove domain prefix
731 * (if present). */
732 username = sm->identity;
733 username_len = sm->identity_len;
734 for (i = 0; i < username_len; i++) {
735 if (username[i] == '\\') {
736 username_len -= i + 1;
737 username += i + 1;
738 break;
739 }
740 }
741
742 chal = eap_ttls_implicit_challenge(
743 sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
744 if (chal == NULL) {
745 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Failed to generate "
746 "challenge from TLS data");
747 eap_ttls_state(data, FAILURE);
748 return;
749 }
750
751 if (os_memcmp_const(challenge, chal, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN)
752 != 0 ||
753 response[0] != chal[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN]) {
754 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Challenge mismatch");
755 os_free(chal);
756 eap_ttls_state(data, FAILURE);
757 return;
758 }
759 os_free(chal);
760
761 auth_challenge = challenge;
762 peer_challenge = response + 2;
763
764 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: User",
765 username, username_len);
766 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: auth_challenge",
767 auth_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
768 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: peer_challenge",
769 peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
770
771 if (sm->user->password_hash) {
772 generate_nt_response_pwhash(auth_challenge, peer_challenge,
773 username, username_len,
774 sm->user->password,
775 nt_response);
776 } else {
777 generate_nt_response(auth_challenge, peer_challenge,
778 username, username_len,
779 sm->user->password,
780 sm->user->password_len,
781 nt_response);
782 }
783
784 rx_resp = response + 2 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 8;
785 #ifdef CONFIG_TESTING_OPTIONS
786 {
787 u8 challenge2[8];
788
789 if (challenge_hash(peer_challenge, auth_challenge,
790 username, username_len, challenge2) == 0) {
791 eap_server_mschap_rx_callback(sm, "TTLS-MSCHAPV2",
792 username, username_len,
793 challenge2, rx_resp);
794 }
795 }
796 #endif /* CONFIG_TESTING_OPTIONS */
797 if (os_memcmp_const(nt_response, rx_resp, 24) == 0) {
798 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Correct "
799 "NT-Response");
800 data->mschapv2_resp_ok = 1;
801
802 if (sm->user->password_hash) {
803 generate_authenticator_response_pwhash(
804 sm->user->password,
805 peer_challenge, auth_challenge,
806 username, username_len, nt_response,
807 data->mschapv2_auth_response);
808 } else {
809 generate_authenticator_response(
810 sm->user->password, sm->user->password_len,
811 peer_challenge, auth_challenge,
812 username, username_len, nt_response,
813 data->mschapv2_auth_response);
814 }
815 } else {
816 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Invalid "
817 "NT-Response");
818 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: Received",
819 rx_resp, 24);
820 wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: Expected",
821 nt_response, 24);
822 data->mschapv2_resp_ok = 0;
823 }
824 eap_ttls_state(data, PHASE2_MSCHAPV2_RESP);
825 data->mschapv2_ident = response[0];
826 }
827
828
eap_ttls_phase2_eap_init(struct eap_sm * sm,struct eap_ttls_data * data,int vendor,enum eap_type eap_type)829 static int eap_ttls_phase2_eap_init(struct eap_sm *sm,
830 struct eap_ttls_data *data,
831 int vendor, enum eap_type eap_type)
832 {
833 if (data->phase2_priv && data->phase2_method) {
834 data->phase2_method->reset(sm, data->phase2_priv);
835 data->phase2_method = NULL;
836 data->phase2_priv = NULL;
837 }
838 data->phase2_method = eap_server_get_eap_method(vendor, eap_type);
839 if (!data->phase2_method)
840 return -1;
841
842 sm->init_phase2 = 1;
843 data->phase2_priv = data->phase2_method->init(sm);
844 sm->init_phase2 = 0;
845 return data->phase2_priv == NULL ? -1 : 0;
846 }
847
848
eap_ttls_process_phase2_eap_response(struct eap_sm * sm,struct eap_ttls_data * data,u8 * in_data,size_t in_len)849 static void eap_ttls_process_phase2_eap_response(struct eap_sm *sm,
850 struct eap_ttls_data *data,
851 u8 *in_data, size_t in_len)
852 {
853 int next_vendor = EAP_VENDOR_IETF;
854 enum eap_type next_type = EAP_TYPE_NONE;
855 struct eap_hdr *hdr;
856 u8 *pos;
857 size_t left;
858 struct wpabuf buf;
859 const struct eap_method *m = data->phase2_method;
860 void *priv = data->phase2_priv;
861
862 if (priv == NULL) {
863 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: %s - Phase2 not "
864 "initialized?!", __func__);
865 return;
866 }
867
868 hdr = (struct eap_hdr *) in_data;
869 pos = (u8 *) (hdr + 1);
870
871 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
872 left = in_len - sizeof(*hdr);
873 wpa_hexdump(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 type Nak'ed; "
874 "allowed types", pos + 1, left - 1);
875 eap_sm_process_nak(sm, pos + 1, left - 1);
876 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
877 sm->user->methods[sm->user_eap_method_index].method !=
878 EAP_TYPE_NONE) {
879 next_vendor = sm->user->methods[
880 sm->user_eap_method_index].vendor;
881 next_type = sm->user->methods[
882 sm->user_eap_method_index++].method;
883 wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %u:%u",
884 next_vendor, next_type);
885 if (eap_ttls_phase2_eap_init(sm, data, next_vendor,
886 next_type)) {
887 wpa_printf(MSG_DEBUG,
888 "EAP-TTLS: Failed to initialize EAP type %u:%u",
889 next_vendor, next_type);
890 eap_ttls_state(data, FAILURE);
891 return;
892 }
893 } else {
894 eap_ttls_state(data, FAILURE);
895 }
896 return;
897 }
898
899 wpabuf_set(&buf, in_data, in_len);
900
901 if (m->check(sm, priv, &buf)) {
902 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 check() asked to "
903 "ignore the packet");
904 return;
905 }
906
907 m->process(sm, priv, &buf);
908
909 if (sm->method_pending == METHOD_PENDING_WAIT) {
910 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 method is in "
911 "pending wait state - save decrypted response");
912 wpabuf_free(data->pending_phase2_eap_resp);
913 data->pending_phase2_eap_resp = wpabuf_dup(&buf);
914 }
915
916 if (!m->isDone(sm, priv))
917 return;
918
919 if (!m->isSuccess(sm, priv)) {
920 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 method failed");
921 eap_ttls_state(data, FAILURE);
922 return;
923 }
924
925 switch (data->state) {
926 case PHASE2_START:
927 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
928 wpa_hexdump_ascii(MSG_DEBUG, "EAP_TTLS: Phase2 "
929 "Identity not found in the user "
930 "database",
931 sm->identity, sm->identity_len);
932 eap_ttls_state(data, FAILURE);
933 break;
934 }
935
936 eap_ttls_state(data, PHASE2_METHOD);
937 next_vendor = sm->user->methods[0].vendor;
938 next_type = sm->user->methods[0].method;
939 sm->user_eap_method_index = 1;
940 wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %u:%u",
941 next_vendor, next_type);
942 if (eap_ttls_phase2_eap_init(sm, data, next_vendor,
943 next_type)) {
944 wpa_printf(MSG_DEBUG,
945 "EAP-TTLS: Failed to initialize EAP type %u:%u",
946 next_vendor, next_type);
947 eap_ttls_state(data, FAILURE);
948 }
949 break;
950 case PHASE2_METHOD:
951 eap_ttls_state(data, SUCCESS);
952 eap_ttls_valid_session(sm, data);
953 break;
954 case FAILURE:
955 break;
956 default:
957 wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
958 __func__, data->state);
959 break;
960 }
961 }
962
963
eap_ttls_process_phase2_eap(struct eap_sm * sm,struct eap_ttls_data * data,const u8 * eap,size_t eap_len)964 static void eap_ttls_process_phase2_eap(struct eap_sm *sm,
965 struct eap_ttls_data *data,
966 const u8 *eap, size_t eap_len)
967 {
968 struct eap_hdr *hdr;
969 size_t len;
970
971 if (data->state == PHASE2_START) {
972 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: initializing Phase 2");
973 if (eap_ttls_phase2_eap_init(sm, data, EAP_VENDOR_IETF,
974 EAP_TYPE_IDENTITY) < 0) {
975 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: failed to "
976 "initialize EAP-Identity");
977 return;
978 }
979 }
980
981 if (eap_len < sizeof(*hdr)) {
982 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: too short Phase 2 EAP "
983 "packet (len=%lu)", (unsigned long) eap_len);
984 return;
985 }
986
987 hdr = (struct eap_hdr *) eap;
988 len = be_to_host16(hdr->length);
989 wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: received Phase 2 EAP: code=%d "
990 "identifier=%d length=%lu", hdr->code, hdr->identifier,
991 (unsigned long) len);
992 if (len > eap_len) {
993 wpa_printf(MSG_INFO, "EAP-TTLS/EAP: Length mismatch in Phase 2"
994 " EAP frame (hdr len=%lu, data len in AVP=%lu)",
995 (unsigned long) len, (unsigned long) eap_len);
996 return;
997 }
998
999 switch (hdr->code) {
1000 case EAP_CODE_RESPONSE:
1001 eap_ttls_process_phase2_eap_response(sm, data, (u8 *) hdr,
1002 len);
1003 break;
1004 default:
1005 wpa_printf(MSG_INFO, "EAP-TTLS/EAP: Unexpected code=%d in "
1006 "Phase 2 EAP header", hdr->code);
1007 break;
1008 }
1009 }
1010
1011
eap_ttls_process_phase2(struct eap_sm * sm,struct eap_ttls_data * data,struct wpabuf * in_buf)1012 static void eap_ttls_process_phase2(struct eap_sm *sm,
1013 struct eap_ttls_data *data,
1014 struct wpabuf *in_buf)
1015 {
1016 struct wpabuf *in_decrypted;
1017 struct eap_ttls_avp parse;
1018
1019 wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1020 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1021
1022 if (data->pending_phase2_eap_resp) {
1023 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 EAP response "
1024 "- skip decryption and use old data");
1025 eap_ttls_process_phase2_eap(
1026 sm, data, wpabuf_head(data->pending_phase2_eap_resp),
1027 wpabuf_len(data->pending_phase2_eap_resp));
1028 wpabuf_free(data->pending_phase2_eap_resp);
1029 data->pending_phase2_eap_resp = NULL;
1030 return;
1031 }
1032
1033 in_decrypted = tls_connection_decrypt(sm->cfg->ssl_ctx, data->ssl.conn,
1034 in_buf);
1035 if (in_decrypted == NULL) {
1036 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
1037 "data");
1038 eap_ttls_state(data, FAILURE);
1039 return;
1040 }
1041
1042 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 EAP",
1043 in_decrypted);
1044
1045 if (eap_ttls_avp_parse(in_decrypted, &parse) < 0) {
1046 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to parse AVPs");
1047 wpabuf_free(in_decrypted);
1048 eap_ttls_state(data, FAILURE);
1049 return;
1050 }
1051
1052 if (parse.user_name) {
1053 char *nbuf;
1054 nbuf = os_malloc(parse.user_name_len * 4 + 1);
1055 if (nbuf) {
1056 printf_encode(nbuf, parse.user_name_len * 4 + 1,
1057 parse.user_name,
1058 parse.user_name_len);
1059 eap_log_msg(sm, "TTLS-User-Name '%s'", nbuf);
1060 os_free(nbuf);
1061 }
1062
1063 os_free(sm->identity);
1064 sm->identity = os_memdup(parse.user_name, parse.user_name_len);
1065 if (sm->identity == NULL) {
1066 eap_ttls_state(data, FAILURE);
1067 goto done;
1068 }
1069 sm->identity_len = parse.user_name_len;
1070 if (eap_user_get(sm, parse.user_name, parse.user_name_len, 1)
1071 != 0) {
1072 wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 Identity not "
1073 "found in the user database");
1074 eap_ttls_state(data, FAILURE);
1075 goto done;
1076 }
1077 }
1078
1079 #ifdef EAP_SERVER_TNC
1080 if (data->tnc_started && parse.eap == NULL) {
1081 wpa_printf(MSG_DEBUG, "EAP-TTLS: TNC started but no EAP "
1082 "response from peer");
1083 eap_ttls_state(data, FAILURE);
1084 goto done;
1085 }
1086 #endif /* EAP_SERVER_TNC */
1087
1088 if (parse.eap) {
1089 eap_ttls_process_phase2_eap(sm, data, parse.eap,
1090 parse.eap_len);
1091 } else if (parse.user_password) {
1092 eap_ttls_process_phase2_pap(sm, data, parse.user_password,
1093 parse.user_password_len);
1094 } else if (parse.chap_password) {
1095 eap_ttls_process_phase2_chap(sm, data,
1096 parse.chap_challenge,
1097 parse.chap_challenge_len,
1098 parse.chap_password,
1099 parse.chap_password_len);
1100 } else if (parse.mschap_response) {
1101 eap_ttls_process_phase2_mschap(sm, data,
1102 parse.mschap_challenge,
1103 parse.mschap_challenge_len,
1104 parse.mschap_response,
1105 parse.mschap_response_len);
1106 } else if (parse.mschap2_response) {
1107 eap_ttls_process_phase2_mschapv2(sm, data,
1108 parse.mschap_challenge,
1109 parse.mschap_challenge_len,
1110 parse.mschap2_response,
1111 parse.mschap2_response_len);
1112 }
1113
1114 done:
1115 wpabuf_free(in_decrypted);
1116 os_free(parse.eap);
1117 }
1118
1119
eap_ttls_start_tnc(struct eap_sm * sm,struct eap_ttls_data * data)1120 static void eap_ttls_start_tnc(struct eap_sm *sm, struct eap_ttls_data *data)
1121 {
1122 #ifdef EAP_SERVER_TNC
1123 if (!sm->cfg->tnc || data->state != SUCCESS || data->tnc_started)
1124 return;
1125
1126 wpa_printf(MSG_DEBUG, "EAP-TTLS: Initialize TNC");
1127 if (eap_ttls_phase2_eap_init(sm, data, EAP_VENDOR_IETF, EAP_TYPE_TNC)) {
1128 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to initialize TNC");
1129 eap_ttls_state(data, FAILURE);
1130 return;
1131 }
1132
1133 data->tnc_started = 1;
1134 eap_ttls_state(data, PHASE2_METHOD);
1135 #endif /* EAP_SERVER_TNC */
1136 }
1137
1138
eap_ttls_process_version(struct eap_sm * sm,void * priv,int peer_version)1139 static int eap_ttls_process_version(struct eap_sm *sm, void *priv,
1140 int peer_version)
1141 {
1142 struct eap_ttls_data *data = priv;
1143 if (peer_version < data->ttls_version) {
1144 wpa_printf(MSG_DEBUG, "EAP-TTLS: peer ver=%d, own ver=%d; "
1145 "use version %d",
1146 peer_version, data->ttls_version, peer_version);
1147 data->ttls_version = peer_version;
1148 }
1149
1150 return 0;
1151 }
1152
1153
eap_ttls_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1154 static void eap_ttls_process_msg(struct eap_sm *sm, void *priv,
1155 const struct wpabuf *respData)
1156 {
1157 struct eap_ttls_data *data = priv;
1158
1159 switch (data->state) {
1160 case PHASE1:
1161 if (eap_server_tls_phase1(sm, &data->ssl) < 0)
1162 eap_ttls_state(data, FAILURE);
1163 break;
1164 case PHASE2_START:
1165 case PHASE2_METHOD:
1166 eap_ttls_process_phase2(sm, data, data->ssl.tls_in);
1167 eap_ttls_start_tnc(sm, data);
1168 break;
1169 case PHASE2_MSCHAPV2_RESP:
1170 if (data->mschapv2_resp_ok && wpabuf_len(data->ssl.tls_in) ==
1171 0) {
1172 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
1173 "acknowledged response");
1174 eap_ttls_state(data, SUCCESS);
1175 eap_ttls_valid_session(sm, data);
1176 } else if (!data->mschapv2_resp_ok) {
1177 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
1178 "acknowledged error");
1179 eap_ttls_state(data, FAILURE);
1180 } else {
1181 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Unexpected "
1182 "frame from peer (payload len %lu, "
1183 "expected empty frame)",
1184 (unsigned long)
1185 wpabuf_len(data->ssl.tls_in));
1186 eap_ttls_state(data, FAILURE);
1187 }
1188 eap_ttls_start_tnc(sm, data);
1189 break;
1190 default:
1191 wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected state %d in %s",
1192 data->state, __func__);
1193 break;
1194 }
1195 }
1196
1197
eap_ttls_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1198 static void eap_ttls_process(struct eap_sm *sm, void *priv,
1199 struct wpabuf *respData)
1200 {
1201 struct eap_ttls_data *data = priv;
1202 const struct wpabuf *buf;
1203 const u8 *pos;
1204 u8 id_len;
1205
1206 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1207 EAP_TYPE_TTLS, eap_ttls_process_version,
1208 eap_ttls_process_msg) < 0) {
1209 eap_ttls_state(data, FAILURE);
1210 return;
1211 }
1212
1213 if (!tls_connection_established(sm->cfg->ssl_ctx, data->ssl.conn) ||
1214 !tls_connection_resumed(sm->cfg->ssl_ctx, data->ssl.conn))
1215 return;
1216
1217 buf = tls_connection_get_success_data(data->ssl.conn);
1218 if (!buf || wpabuf_len(buf) < 1) {
1219 wpa_printf(MSG_DEBUG,
1220 "EAP-TTLS: No success data in resumed session - reject attempt");
1221 eap_ttls_state(data, FAILURE);
1222 return;
1223 }
1224
1225 pos = wpabuf_head(buf);
1226 if (*pos != EAP_TYPE_TTLS) {
1227 wpa_printf(MSG_DEBUG,
1228 "EAP-TTLS: Resumed session for another EAP type (%u) - reject attempt",
1229 *pos);
1230 eap_ttls_state(data, FAILURE);
1231 return;
1232 }
1233
1234 pos++;
1235 id_len = *pos++;
1236 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: Identity from cached session",
1237 pos, id_len);
1238 os_free(sm->identity);
1239 sm->identity = os_malloc(id_len ? id_len : 1);
1240 if (!sm->identity) {
1241 sm->identity_len = 0;
1242 eap_ttls_state(data, FAILURE);
1243 return;
1244 }
1245
1246 os_memcpy(sm->identity, pos, id_len);
1247 sm->identity_len = id_len;
1248
1249 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1250 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: Phase2 Identity not found in the user database",
1251 sm->identity, sm->identity_len);
1252 eap_ttls_state(data, FAILURE);
1253 return;
1254 }
1255
1256 wpa_printf(MSG_DEBUG,
1257 "EAP-TTLS: Resuming previous session - skip Phase2");
1258 eap_ttls_state(data, SUCCESS);
1259 tls_connection_set_success_data_resumed(data->ssl.conn);
1260 }
1261
1262
eap_ttls_isDone(struct eap_sm * sm,void * priv)1263 static bool eap_ttls_isDone(struct eap_sm *sm, void *priv)
1264 {
1265 struct eap_ttls_data *data = priv;
1266 return data->state == SUCCESS || data->state == FAILURE;
1267 }
1268
1269
eap_ttls_getKey(struct eap_sm * sm,void * priv,size_t * len)1270 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1271 {
1272 struct eap_ttls_data *data = priv;
1273 u8 *eapKeyData;
1274 const char *label;
1275 const u8 eap_tls13_context[1] = { EAP_TYPE_TTLS };
1276 const u8 *context = NULL;
1277 size_t context_len = 0;
1278
1279 if (data->state != SUCCESS)
1280 return NULL;
1281
1282 if (data->ssl.tls_v13) {
1283 label = "EXPORTER_EAP_TLS_Key_Material";
1284 context = eap_tls13_context;
1285 context_len = sizeof(eap_tls13_context);
1286 } else {
1287 label = "ttls keying material";
1288 }
1289
1290 eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
1291 label, context, context_len,
1292 EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
1293 if (eapKeyData) {
1294 *len = EAP_TLS_KEY_LEN;
1295 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
1296 eapKeyData, EAP_TLS_KEY_LEN);
1297 } else {
1298 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
1299 }
1300
1301 return eapKeyData;
1302 }
1303
1304
eap_ttls_isSuccess(struct eap_sm * sm,void * priv)1305 static bool eap_ttls_isSuccess(struct eap_sm *sm, void *priv)
1306 {
1307 struct eap_ttls_data *data = priv;
1308 return data->state == SUCCESS;
1309 }
1310
1311
eap_ttls_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1312 static u8 * eap_ttls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1313 {
1314 struct eap_ttls_data *data = priv;
1315
1316 if (data->state != SUCCESS)
1317 return NULL;
1318
1319 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_TTLS,
1320 len);
1321 }
1322
1323
eap_ttls_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1324 static u8 * eap_ttls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1325 {
1326 struct eap_ttls_data *data = priv;
1327 u8 *eapKeyData, *emsk;
1328 const char *label;
1329 const u8 eap_tls13_context[1] = { EAP_TYPE_TTLS };
1330 const u8 *context = NULL;
1331 size_t context_len = 0;
1332
1333 if (data->state != SUCCESS)
1334 return NULL;
1335
1336 if (data->ssl.tls_v13) {
1337 label = "EXPORTER_EAP_TLS_Key_Material";
1338 context = eap_tls13_context;
1339 context_len = sizeof(eap_tls13_context);
1340 } else {
1341 label = "ttls keying material";
1342 }
1343
1344 eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
1345 label, context, context_len,
1346 EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
1347 if (eapKeyData) {
1348 emsk = os_malloc(EAP_EMSK_LEN);
1349 if (emsk)
1350 os_memcpy(emsk, eapKeyData + EAP_TLS_KEY_LEN,
1351 EAP_EMSK_LEN);
1352 bin_clear_free(eapKeyData, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
1353 } else
1354 emsk = NULL;
1355
1356 if (emsk) {
1357 *len = EAP_EMSK_LEN;
1358 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived EMSK",
1359 emsk, EAP_EMSK_LEN);
1360 } else {
1361 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive EMSK");
1362 }
1363
1364 return emsk;
1365 }
1366
1367
eap_server_ttls_register(void)1368 int eap_server_ttls_register(void)
1369 {
1370 struct eap_method *eap;
1371
1372 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1373 EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1374 if (eap == NULL)
1375 return -1;
1376
1377 eap->init = eap_ttls_init;
1378 eap->reset = eap_ttls_reset;
1379 eap->buildReq = eap_ttls_buildReq;
1380 eap->check = eap_ttls_check;
1381 eap->process = eap_ttls_process;
1382 eap->isDone = eap_ttls_isDone;
1383 eap->getKey = eap_ttls_getKey;
1384 eap->isSuccess = eap_ttls_isSuccess;
1385 eap->getSessionId = eap_ttls_get_session_id;
1386 eap->get_emsk = eap_ttls_get_emsk;
1387
1388 return eap_server_method_register(eap);
1389 }
1390
