Line data Source code
1 : /*
2 : * EAP peer method: 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_common/chap.h"
16 : #include "eap_common/eap_ttls.h"
17 : #include "mschapv2.h"
18 : #include "eap_i.h"
19 : #include "eap_tls_common.h"
20 : #include "eap_config.h"
21 :
22 :
23 : #define EAP_TTLS_VERSION 0
24 :
25 :
26 : static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
27 :
28 :
29 : struct eap_ttls_data {
30 : struct eap_ssl_data ssl;
31 :
32 : int ttls_version;
33 :
34 : const struct eap_method *phase2_method;
35 : void *phase2_priv;
36 : int phase2_success;
37 : int phase2_start;
38 :
39 : enum phase2_types {
40 : EAP_TTLS_PHASE2_EAP,
41 : EAP_TTLS_PHASE2_MSCHAPV2,
42 : EAP_TTLS_PHASE2_MSCHAP,
43 : EAP_TTLS_PHASE2_PAP,
44 : EAP_TTLS_PHASE2_CHAP
45 : } phase2_type;
46 : struct eap_method_type phase2_eap_type;
47 : struct eap_method_type *phase2_eap_types;
48 : size_t num_phase2_eap_types;
49 :
50 : u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN];
51 : int auth_response_valid;
52 : u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */
53 : u8 ident;
54 : int resuming; /* starting a resumed session */
55 : int reauth; /* reauthentication */
56 : u8 *key_data;
57 : u8 *session_id;
58 : size_t id_len;
59 :
60 : struct wpabuf *pending_phase2_req;
61 :
62 : #ifdef EAP_TNC
63 : int ready_for_tnc;
64 : int tnc_started;
65 : #endif /* EAP_TNC */
66 : };
67 :
68 :
69 109 : static void * eap_ttls_init(struct eap_sm *sm)
70 : {
71 : struct eap_ttls_data *data;
72 109 : struct eap_peer_config *config = eap_get_config(sm);
73 : char *selected;
74 :
75 109 : data = os_zalloc(sizeof(*data));
76 109 : if (data == NULL)
77 0 : return NULL;
78 109 : data->ttls_version = EAP_TTLS_VERSION;
79 109 : selected = "EAP";
80 109 : data->phase2_type = EAP_TTLS_PHASE2_EAP;
81 :
82 109 : if (config && config->phase2) {
83 108 : if (os_strstr(config->phase2, "autheap=")) {
84 10 : selected = "EAP";
85 10 : data->phase2_type = EAP_TTLS_PHASE2_EAP;
86 98 : } else if (os_strstr(config->phase2, "auth=MSCHAPV2")) {
87 73 : selected = "MSCHAPV2";
88 73 : data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
89 25 : } else if (os_strstr(config->phase2, "auth=MSCHAP")) {
90 13 : selected = "MSCHAP";
91 13 : data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
92 12 : } else if (os_strstr(config->phase2, "auth=PAP")) {
93 5 : selected = "PAP";
94 5 : data->phase2_type = EAP_TTLS_PHASE2_PAP;
95 7 : } else if (os_strstr(config->phase2, "auth=CHAP")) {
96 7 : selected = "CHAP";
97 7 : data->phase2_type = EAP_TTLS_PHASE2_CHAP;
98 : }
99 : }
100 109 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
101 :
102 109 : if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
103 11 : if (eap_peer_select_phase2_methods(config, "autheap=",
104 : &data->phase2_eap_types,
105 : &data->num_phase2_eap_types)
106 : < 0) {
107 0 : eap_ttls_deinit(sm, data);
108 0 : return NULL;
109 : }
110 :
111 11 : data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
112 11 : data->phase2_eap_type.method = EAP_TYPE_NONE;
113 : }
114 :
115 109 : if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TTLS)) {
116 3 : wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
117 3 : eap_ttls_deinit(sm, data);
118 3 : return NULL;
119 : }
120 :
121 106 : return data;
122 : }
123 :
124 :
125 109 : static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm,
126 : struct eap_ttls_data *data)
127 : {
128 109 : if (data->phase2_priv && data->phase2_method) {
129 11 : data->phase2_method->deinit(sm, data->phase2_priv);
130 11 : data->phase2_method = NULL;
131 11 : data->phase2_priv = NULL;
132 : }
133 109 : }
134 :
135 :
136 109 : static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
137 : {
138 109 : struct eap_ttls_data *data = priv;
139 109 : if (data == NULL)
140 109 : return;
141 109 : eap_ttls_phase2_eap_deinit(sm, data);
142 109 : os_free(data->phase2_eap_types);
143 109 : eap_peer_tls_ssl_deinit(sm, &data->ssl);
144 109 : os_free(data->key_data);
145 109 : os_free(data->session_id);
146 109 : wpabuf_free(data->pending_phase2_req);
147 109 : os_free(data);
148 : }
149 :
150 :
151 315 : static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
152 : int mandatory, size_t len)
153 : {
154 : struct ttls_avp_vendor *avp;
155 : u8 flags;
156 : size_t hdrlen;
157 :
158 315 : avp = (struct ttls_avp_vendor *) avphdr;
159 315 : flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
160 315 : if (vendor_id) {
161 158 : flags |= AVP_FLAGS_VENDOR;
162 158 : hdrlen = sizeof(*avp);
163 158 : avp->vendor_id = host_to_be32(vendor_id);
164 : } else {
165 157 : hdrlen = sizeof(struct ttls_avp);
166 : }
167 :
168 315 : avp->avp_code = host_to_be32(avp_code);
169 315 : avp->avp_length = host_to_be32((flags << 24) | (u32) (hdrlen + len));
170 :
171 315 : return avphdr + hdrlen;
172 : }
173 :
174 :
175 180 : static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
176 : u32 vendor_id, int mandatory,
177 : const u8 *data, size_t len)
178 : {
179 : u8 *pos;
180 180 : pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
181 180 : os_memcpy(pos, data, len);
182 180 : pos += len;
183 180 : AVP_PAD(start, pos);
184 180 : return pos;
185 : }
186 :
187 :
188 42 : static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code,
189 : int mandatory)
190 : {
191 : struct wpabuf *msg;
192 : u8 *avp, *pos;
193 :
194 42 : msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4);
195 42 : if (msg == NULL) {
196 0 : wpabuf_free(*resp);
197 0 : *resp = NULL;
198 0 : return -1;
199 : }
200 :
201 42 : avp = wpabuf_mhead(msg);
202 42 : pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp));
203 42 : os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp));
204 42 : pos += wpabuf_len(*resp);
205 42 : AVP_PAD(avp, pos);
206 42 : wpabuf_free(*resp);
207 42 : wpabuf_put(msg, pos - avp);
208 42 : *resp = msg;
209 42 : return 0;
210 : }
211 :
212 :
213 106 : static int eap_ttls_v0_derive_key(struct eap_sm *sm,
214 : struct eap_ttls_data *data)
215 : {
216 106 : os_free(data->key_data);
217 106 : data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
218 : "ttls keying material",
219 : EAP_TLS_KEY_LEN);
220 106 : if (!data->key_data) {
221 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
222 0 : return -1;
223 : }
224 :
225 106 : wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
226 106 : data->key_data, EAP_TLS_KEY_LEN);
227 :
228 106 : os_free(data->session_id);
229 106 : data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
230 : EAP_TYPE_TTLS,
231 : &data->id_len);
232 106 : if (data->session_id) {
233 212 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived Session-Id",
234 106 : data->session_id, data->id_len);
235 : } else {
236 0 : wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive Session-Id");
237 : }
238 :
239 106 : return 0;
240 : }
241 :
242 :
243 87 : static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
244 : struct eap_ttls_data *data, size_t len)
245 : {
246 87 : return eap_peer_tls_derive_key(sm, &data->ssl, "ttls challenge", len);
247 : }
248 :
249 :
250 13 : static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data,
251 : u8 method)
252 : {
253 : size_t i;
254 32 : for (i = 0; i < data->num_phase2_eap_types; i++) {
255 26 : if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF ||
256 13 : data->phase2_eap_types[i].method != method)
257 3 : continue;
258 :
259 10 : data->phase2_eap_type.vendor =
260 10 : data->phase2_eap_types[i].vendor;
261 10 : data->phase2_eap_type.method =
262 10 : data->phase2_eap_types[i].method;
263 10 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
264 : "Phase 2 EAP vendor %d method %d",
265 : data->phase2_eap_type.vendor,
266 : data->phase2_eap_type.method);
267 10 : break;
268 : }
269 13 : }
270 :
271 :
272 26 : static int eap_ttls_phase2_eap_process(struct eap_sm *sm,
273 : struct eap_ttls_data *data,
274 : struct eap_method_ret *ret,
275 : struct eap_hdr *hdr, size_t len,
276 : struct wpabuf **resp)
277 : {
278 : struct wpabuf msg;
279 : struct eap_method_ret iret;
280 :
281 26 : os_memset(&iret, 0, sizeof(iret));
282 26 : wpabuf_set(&msg, hdr, len);
283 26 : *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
284 : &msg);
285 40 : if ((iret.methodState == METHOD_DONE ||
286 38 : iret.methodState == METHOD_MAY_CONT) &&
287 41 : (iret.decision == DECISION_UNCOND_SUCC ||
288 28 : iret.decision == DECISION_COND_SUCC ||
289 11 : iret.decision == DECISION_FAIL)) {
290 24 : ret->methodState = iret.methodState;
291 24 : ret->decision = iret.decision;
292 : }
293 :
294 26 : return 0;
295 : }
296 :
297 :
298 31 : static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm,
299 : struct eap_ttls_data *data,
300 : struct eap_method_ret *ret,
301 : struct eap_hdr *hdr, size_t len,
302 : u8 method, struct wpabuf **resp)
303 : {
304 : #ifdef EAP_TNC
305 33 : if (data->tnc_started && data->phase2_method &&
306 6 : data->phase2_priv && method == EAP_TYPE_TNC &&
307 2 : data->phase2_eap_type.method == EAP_TYPE_TNC)
308 2 : return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len,
309 : resp);
310 :
311 29 : if (data->ready_for_tnc && !data->tnc_started &&
312 : method == EAP_TYPE_TNC) {
313 0 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
314 : "EAP method");
315 0 : data->tnc_started = 1;
316 : }
317 :
318 29 : if (data->tnc_started) {
319 2 : if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF ||
320 1 : data->phase2_eap_type.method == EAP_TYPE_TNC) {
321 0 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP "
322 : "type %d for TNC", method);
323 0 : return -1;
324 : }
325 :
326 1 : data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
327 1 : data->phase2_eap_type.method = method;
328 1 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
329 : "Phase 2 EAP vendor %d method %d (TNC)",
330 : data->phase2_eap_type.vendor,
331 : data->phase2_eap_type.method);
332 :
333 1 : if (data->phase2_type == EAP_TTLS_PHASE2_EAP)
334 0 : eap_ttls_phase2_eap_deinit(sm, data);
335 : }
336 : #endif /* EAP_TNC */
337 :
338 58 : if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
339 29 : data->phase2_eap_type.method == EAP_TYPE_NONE)
340 13 : eap_ttls_phase2_select_eap_method(data, method);
341 :
342 29 : if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE)
343 : {
344 5 : if (eap_peer_tls_phase2_nak(data->phase2_eap_types,
345 : data->num_phase2_eap_types,
346 : hdr, resp))
347 0 : return -1;
348 5 : return 0;
349 : }
350 :
351 24 : if (data->phase2_priv == NULL) {
352 11 : data->phase2_method = eap_peer_get_eap_method(
353 : EAP_VENDOR_IETF, method);
354 11 : if (data->phase2_method) {
355 11 : sm->init_phase2 = 1;
356 11 : data->phase2_priv = data->phase2_method->init(sm);
357 11 : sm->init_phase2 = 0;
358 : }
359 : }
360 24 : if (data->phase2_priv == NULL || data->phase2_method == NULL) {
361 0 : wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
362 : "Phase 2 EAP method %d", method);
363 0 : return -1;
364 : }
365 :
366 24 : return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp);
367 : }
368 :
369 :
370 44 : static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
371 : struct eap_ttls_data *data,
372 : struct eap_method_ret *ret,
373 : struct eap_hdr *hdr,
374 : struct wpabuf **resp)
375 : {
376 44 : size_t len = be_to_host16(hdr->length);
377 : u8 *pos;
378 44 : struct eap_peer_config *config = eap_get_config(sm);
379 :
380 44 : if (len <= sizeof(struct eap_hdr)) {
381 0 : wpa_printf(MSG_INFO, "EAP-TTLS: too short "
382 : "Phase 2 request (len=%lu)", (unsigned long) len);
383 0 : return -1;
384 : }
385 44 : pos = (u8 *) (hdr + 1);
386 44 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
387 44 : switch (*pos) {
388 : case EAP_TYPE_IDENTITY:
389 13 : *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
390 13 : break;
391 : default:
392 31 : if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len,
393 31 : *pos, resp) < 0)
394 0 : return -1;
395 31 : break;
396 : }
397 :
398 46 : if (*resp == NULL &&
399 4 : (config->pending_req_identity || config->pending_req_password ||
400 0 : config->pending_req_otp)) {
401 2 : return 0;
402 : }
403 :
404 42 : if (*resp == NULL)
405 0 : return -1;
406 :
407 42 : wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
408 : *resp);
409 42 : return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1);
410 : }
411 :
412 :
413 67 : static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
414 : struct eap_ttls_data *data,
415 : struct eap_method_ret *ret,
416 : struct wpabuf **resp)
417 : {
418 : #ifdef EAP_MSCHAPv2
419 : struct wpabuf *msg;
420 : u8 *buf, *pos, *challenge, *peer_challenge;
421 : const u8 *identity, *password;
422 : size_t identity_len, password_len;
423 : int pwhash;
424 :
425 67 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
426 :
427 67 : identity = eap_get_config_identity(sm, &identity_len);
428 67 : password = eap_get_config_password2(sm, &password_len, &pwhash);
429 67 : if (identity == NULL || password == NULL)
430 0 : return -1;
431 :
432 67 : msg = wpabuf_alloc(identity_len + 1000);
433 67 : if (msg == NULL) {
434 0 : wpa_printf(MSG_ERROR,
435 : "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
436 0 : return -1;
437 : }
438 67 : pos = buf = wpabuf_mhead(msg);
439 :
440 : /* User-Name */
441 67 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
442 : identity, identity_len);
443 :
444 : /* MS-CHAP-Challenge */
445 67 : challenge = eap_ttls_implicit_challenge(
446 : sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
447 67 : if (challenge == NULL) {
448 0 : wpabuf_free(msg);
449 0 : wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
450 : "implicit challenge");
451 0 : return -1;
452 : }
453 :
454 67 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
455 : RADIUS_VENDOR_ID_MICROSOFT, 1,
456 : challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
457 :
458 : /* MS-CHAP2-Response */
459 67 : pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
460 : RADIUS_VENDOR_ID_MICROSOFT, 1,
461 : EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
462 67 : data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
463 67 : *pos++ = data->ident;
464 67 : *pos++ = 0; /* Flags */
465 67 : if (os_get_random(pos, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN) < 0) {
466 0 : os_free(challenge);
467 0 : wpabuf_free(msg);
468 0 : wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to get "
469 : "random data for peer challenge");
470 0 : return -1;
471 : }
472 67 : peer_challenge = pos;
473 67 : pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
474 67 : os_memset(pos, 0, 8); /* Reserved, must be zero */
475 67 : pos += 8;
476 67 : if (mschapv2_derive_response(identity, identity_len, password,
477 : password_len, pwhash, challenge,
478 67 : peer_challenge, pos, data->auth_response,
479 67 : data->master_key)) {
480 0 : os_free(challenge);
481 0 : wpabuf_free(msg);
482 0 : wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
483 : "response");
484 0 : return -1;
485 : }
486 67 : data->auth_response_valid = 1;
487 :
488 67 : pos += 24;
489 67 : os_free(challenge);
490 67 : AVP_PAD(buf, pos);
491 :
492 67 : wpabuf_put(msg, pos - buf);
493 67 : *resp = msg;
494 :
495 67 : if (sm->workaround) {
496 : /* At least FreeRADIUS seems to be terminating
497 : * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
498 : * packet. */
499 67 : wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
500 : "allow success without tunneled response");
501 67 : ret->methodState = METHOD_MAY_CONT;
502 67 : ret->decision = DECISION_COND_SUCC;
503 : }
504 :
505 67 : return 0;
506 : #else /* EAP_MSCHAPv2 */
507 : wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
508 : return -1;
509 : #endif /* EAP_MSCHAPv2 */
510 : }
511 :
512 :
513 12 : static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
514 : struct eap_ttls_data *data,
515 : struct eap_method_ret *ret,
516 : struct wpabuf **resp)
517 : {
518 : struct wpabuf *msg;
519 : u8 *buf, *pos, *challenge;
520 : const u8 *identity, *password;
521 : size_t identity_len, password_len;
522 : int pwhash;
523 :
524 12 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
525 :
526 12 : identity = eap_get_config_identity(sm, &identity_len);
527 12 : password = eap_get_config_password2(sm, &password_len, &pwhash);
528 12 : if (identity == NULL || password == NULL)
529 0 : return -1;
530 :
531 12 : msg = wpabuf_alloc(identity_len + 1000);
532 12 : if (msg == NULL) {
533 0 : wpa_printf(MSG_ERROR,
534 : "EAP-TTLS/MSCHAP: Failed to allocate memory");
535 0 : return -1;
536 : }
537 12 : pos = buf = wpabuf_mhead(msg);
538 :
539 : /* User-Name */
540 12 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
541 : identity, identity_len);
542 :
543 : /* MS-CHAP-Challenge */
544 12 : challenge = eap_ttls_implicit_challenge(
545 : sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
546 12 : if (challenge == NULL) {
547 0 : wpabuf_free(msg);
548 0 : wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
549 : "implicit challenge");
550 0 : return -1;
551 : }
552 :
553 12 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
554 : RADIUS_VENDOR_ID_MICROSOFT, 1,
555 : challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
556 :
557 : /* MS-CHAP-Response */
558 12 : pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
559 : RADIUS_VENDOR_ID_MICROSOFT, 1,
560 : EAP_TTLS_MSCHAP_RESPONSE_LEN);
561 12 : data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
562 12 : *pos++ = data->ident;
563 12 : *pos++ = 1; /* Flags: Use NT style passwords */
564 12 : os_memset(pos, 0, 24); /* LM-Response */
565 12 : pos += 24;
566 12 : if (pwhash) {
567 0 : challenge_response(challenge, password, pos); /* NT-Response */
568 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
569 : password, 16);
570 : } else {
571 12 : nt_challenge_response(challenge, password, password_len,
572 : pos); /* NT-Response */
573 12 : wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
574 : password, password_len);
575 : }
576 12 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
577 : challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
578 12 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
579 12 : pos += 24;
580 12 : os_free(challenge);
581 12 : AVP_PAD(buf, pos);
582 :
583 12 : wpabuf_put(msg, pos - buf);
584 12 : *resp = msg;
585 :
586 : /* EAP-TTLS/MSCHAP does not provide tunneled success
587 : * notification, so assume that Phase2 succeeds. */
588 12 : ret->methodState = METHOD_DONE;
589 12 : ret->decision = DECISION_COND_SUCC;
590 :
591 12 : return 0;
592 : }
593 :
594 :
595 6 : static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
596 : struct eap_ttls_data *data,
597 : struct eap_method_ret *ret,
598 : struct wpabuf **resp)
599 : {
600 : struct wpabuf *msg;
601 : u8 *buf, *pos;
602 : size_t pad;
603 : const u8 *identity, *password;
604 : size_t identity_len, password_len;
605 :
606 6 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
607 :
608 6 : identity = eap_get_config_identity(sm, &identity_len);
609 6 : password = eap_get_config_password(sm, &password_len);
610 6 : if (identity == NULL || password == NULL)
611 0 : return -1;
612 :
613 6 : msg = wpabuf_alloc(identity_len + password_len + 100);
614 6 : if (msg == NULL) {
615 0 : wpa_printf(MSG_ERROR,
616 : "EAP-TTLS/PAP: Failed to allocate memory");
617 0 : return -1;
618 : }
619 6 : pos = buf = wpabuf_mhead(msg);
620 :
621 : /* User-Name */
622 6 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
623 : identity, identity_len);
624 :
625 : /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
626 : * the data, so no separate encryption is used in the AVP itself.
627 : * However, the password is padded to obfuscate its length. */
628 6 : pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15;
629 6 : pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
630 : password_len + pad);
631 6 : os_memcpy(pos, password, password_len);
632 6 : pos += password_len;
633 6 : os_memset(pos, 0, pad);
634 6 : pos += pad;
635 6 : AVP_PAD(buf, pos);
636 :
637 6 : wpabuf_put(msg, pos - buf);
638 6 : *resp = msg;
639 :
640 : /* EAP-TTLS/PAP does not provide tunneled success notification,
641 : * so assume that Phase2 succeeds. */
642 6 : ret->methodState = METHOD_DONE;
643 6 : ret->decision = DECISION_COND_SUCC;
644 :
645 6 : return 0;
646 : }
647 :
648 :
649 8 : static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
650 : struct eap_ttls_data *data,
651 : struct eap_method_ret *ret,
652 : struct wpabuf **resp)
653 : {
654 : struct wpabuf *msg;
655 : u8 *buf, *pos, *challenge;
656 : const u8 *identity, *password;
657 : size_t identity_len, password_len;
658 :
659 8 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
660 :
661 8 : identity = eap_get_config_identity(sm, &identity_len);
662 8 : password = eap_get_config_password(sm, &password_len);
663 8 : if (identity == NULL || password == NULL)
664 0 : return -1;
665 :
666 8 : msg = wpabuf_alloc(identity_len + 1000);
667 8 : if (msg == NULL) {
668 0 : wpa_printf(MSG_ERROR,
669 : "EAP-TTLS/CHAP: Failed to allocate memory");
670 0 : return -1;
671 : }
672 8 : pos = buf = wpabuf_mhead(msg);
673 :
674 : /* User-Name */
675 8 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
676 : identity, identity_len);
677 :
678 : /* CHAP-Challenge */
679 8 : challenge = eap_ttls_implicit_challenge(
680 : sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
681 8 : if (challenge == NULL) {
682 0 : wpabuf_free(msg);
683 0 : wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
684 : "implicit challenge");
685 0 : return -1;
686 : }
687 :
688 8 : pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
689 : challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
690 :
691 : /* CHAP-Password */
692 8 : pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
693 : 1 + EAP_TTLS_CHAP_PASSWORD_LEN);
694 8 : data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
695 8 : *pos++ = data->ident;
696 :
697 : /* MD5(Ident + Password + Challenge) */
698 8 : chap_md5(data->ident, password, password_len, challenge,
699 : EAP_TTLS_CHAP_CHALLENGE_LEN, pos);
700 :
701 8 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
702 : identity, identity_len);
703 8 : wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
704 : password, password_len);
705 8 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
706 : challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
707 8 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
708 : pos, EAP_TTLS_CHAP_PASSWORD_LEN);
709 8 : pos += EAP_TTLS_CHAP_PASSWORD_LEN;
710 8 : os_free(challenge);
711 8 : AVP_PAD(buf, pos);
712 :
713 8 : wpabuf_put(msg, pos - buf);
714 8 : *resp = msg;
715 :
716 : /* EAP-TTLS/CHAP does not provide tunneled success
717 : * notification, so assume that Phase2 succeeds. */
718 8 : ret->methodState = METHOD_DONE;
719 8 : ret->decision = DECISION_COND_SUCC;
720 :
721 8 : return 0;
722 : }
723 :
724 :
725 140 : static int eap_ttls_phase2_request(struct eap_sm *sm,
726 : struct eap_ttls_data *data,
727 : struct eap_method_ret *ret,
728 : struct eap_hdr *hdr,
729 : struct wpabuf **resp)
730 : {
731 140 : int res = 0;
732 : size_t len;
733 140 : enum phase2_types phase2_type = data->phase2_type;
734 :
735 : #ifdef EAP_TNC
736 140 : if (data->tnc_started) {
737 3 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC");
738 3 : phase2_type = EAP_TTLS_PHASE2_EAP;
739 : }
740 : #endif /* EAP_TNC */
741 :
742 140 : if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
743 58 : phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
744 52 : phase2_type == EAP_TTLS_PHASE2_PAP ||
745 : phase2_type == EAP_TTLS_PHASE2_CHAP) {
746 96 : if (eap_get_config_identity(sm, &len) == NULL) {
747 1 : wpa_printf(MSG_INFO,
748 : "EAP-TTLS: Identity not configured");
749 1 : eap_sm_request_identity(sm);
750 1 : if (eap_get_config_password(sm, &len) == NULL)
751 1 : eap_sm_request_password(sm);
752 1 : return 0;
753 : }
754 :
755 95 : if (eap_get_config_password(sm, &len) == NULL) {
756 2 : wpa_printf(MSG_INFO,
757 : "EAP-TTLS: Password not configured");
758 2 : eap_sm_request_password(sm);
759 2 : return 0;
760 : }
761 : }
762 :
763 137 : switch (phase2_type) {
764 : case EAP_TTLS_PHASE2_EAP:
765 44 : res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp);
766 44 : break;
767 : case EAP_TTLS_PHASE2_MSCHAPV2:
768 67 : res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp);
769 67 : break;
770 : case EAP_TTLS_PHASE2_MSCHAP:
771 12 : res = eap_ttls_phase2_request_mschap(sm, data, ret, resp);
772 12 : break;
773 : case EAP_TTLS_PHASE2_PAP:
774 6 : res = eap_ttls_phase2_request_pap(sm, data, ret, resp);
775 6 : break;
776 : case EAP_TTLS_PHASE2_CHAP:
777 8 : res = eap_ttls_phase2_request_chap(sm, data, ret, resp);
778 8 : break;
779 : default:
780 0 : wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
781 0 : res = -1;
782 0 : break;
783 : }
784 :
785 137 : if (res < 0) {
786 0 : ret->methodState = METHOD_DONE;
787 0 : ret->decision = DECISION_FAIL;
788 : }
789 :
790 137 : return res;
791 : }
792 :
793 :
794 : struct ttls_parse_avp {
795 : u8 *mschapv2;
796 : u8 *eapdata;
797 : size_t eap_len;
798 : int mschapv2_error;
799 : };
800 :
801 :
802 31 : static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen,
803 : struct ttls_parse_avp *parse)
804 : {
805 31 : wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
806 31 : if (parse->eapdata == NULL) {
807 31 : parse->eapdata = os_malloc(dlen);
808 31 : if (parse->eapdata == NULL) {
809 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
810 : "memory for Phase 2 EAP data");
811 0 : return -1;
812 : }
813 31 : os_memcpy(parse->eapdata, dpos, dlen);
814 31 : parse->eap_len = dlen;
815 : } else {
816 0 : u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen);
817 0 : if (neweap == NULL) {
818 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
819 : "memory for Phase 2 EAP data");
820 0 : return -1;
821 : }
822 0 : os_memcpy(neweap + parse->eap_len, dpos, dlen);
823 0 : parse->eapdata = neweap;
824 0 : parse->eap_len += dlen;
825 : }
826 :
827 31 : return 0;
828 : }
829 :
830 :
831 97 : static int eap_ttls_parse_avp(u8 *pos, size_t left,
832 : struct ttls_parse_avp *parse)
833 : {
834 : struct ttls_avp *avp;
835 97 : u32 avp_code, avp_length, vendor_id = 0;
836 : u8 avp_flags, *dpos;
837 : size_t dlen;
838 :
839 97 : avp = (struct ttls_avp *) pos;
840 97 : avp_code = be_to_host32(avp->avp_code);
841 97 : avp_length = be_to_host32(avp->avp_length);
842 97 : avp_flags = (avp_length >> 24) & 0xff;
843 97 : avp_length &= 0xffffff;
844 97 : wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
845 : "length=%d", (int) avp_code, avp_flags,
846 : (int) avp_length);
847 :
848 97 : if (avp_length > left) {
849 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
850 : "(len=%d, left=%lu) - dropped",
851 : (int) avp_length, (unsigned long) left);
852 0 : return -1;
853 : }
854 :
855 97 : if (avp_length < sizeof(*avp)) {
856 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d",
857 : avp_length);
858 0 : return -1;
859 : }
860 :
861 97 : dpos = (u8 *) (avp + 1);
862 97 : dlen = avp_length - sizeof(*avp);
863 97 : if (avp_flags & AVP_FLAGS_VENDOR) {
864 66 : if (dlen < 4) {
865 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP "
866 : "underflow");
867 0 : return -1;
868 : }
869 66 : vendor_id = WPA_GET_BE32(dpos);
870 66 : wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
871 : (int) vendor_id);
872 66 : dpos += 4;
873 66 : dlen -= 4;
874 : }
875 :
876 97 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
877 :
878 97 : if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
879 62 : if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0)
880 0 : return -1;
881 66 : } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
882 : /* This is an optional message that can be displayed to
883 : * the user. */
884 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message",
885 : dpos, dlen);
886 66 : } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
887 : avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
888 65 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success",
889 : dpos, dlen);
890 65 : if (dlen != 43) {
891 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
892 : "MS-CHAP2-Success length "
893 : "(len=%lu, expected 43)",
894 : (unsigned long) dlen);
895 0 : return -1;
896 : }
897 65 : parse->mschapv2 = dpos;
898 1 : } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
899 : avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
900 1 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error",
901 : dpos, dlen);
902 1 : parse->mschapv2_error = 1;
903 0 : } else if (avp_flags & AVP_FLAGS_MANDATORY) {
904 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP "
905 : "code %d vendor_id %d - dropped",
906 : (int) avp_code, (int) vendor_id);
907 0 : return -1;
908 : } else {
909 0 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP "
910 : "code %d vendor_id %d",
911 : (int) avp_code, (int) vendor_id);
912 : }
913 :
914 97 : return avp_length;
915 : }
916 :
917 :
918 97 : static int eap_ttls_parse_avps(struct wpabuf *in_decrypted,
919 : struct ttls_parse_avp *parse)
920 : {
921 : u8 *pos;
922 : size_t left, pad;
923 : int avp_length;
924 :
925 97 : pos = wpabuf_mhead(in_decrypted);
926 97 : left = wpabuf_len(in_decrypted);
927 97 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left);
928 97 : if (left < sizeof(struct ttls_avp)) {
929 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
930 : " len=%lu expected %lu or more - dropped",
931 : (unsigned long) left,
932 : (unsigned long) sizeof(struct ttls_avp));
933 0 : return -1;
934 : }
935 :
936 : /* Parse AVPs */
937 97 : os_memset(parse, 0, sizeof(*parse));
938 :
939 291 : while (left > 0) {
940 97 : avp_length = eap_ttls_parse_avp(pos, left, parse);
941 97 : if (avp_length < 0)
942 0 : return -1;
943 :
944 97 : pad = (4 - (avp_length & 3)) & 3;
945 97 : pos += avp_length + pad;
946 97 : if (left < avp_length + pad)
947 65 : left = 0;
948 : else
949 32 : left -= avp_length + pad;
950 : }
951 :
952 97 : return 0;
953 : }
954 :
955 :
956 109 : static u8 * eap_ttls_fake_identity_request(void)
957 : {
958 : struct eap_hdr *hdr;
959 : u8 *buf;
960 :
961 109 : wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
962 : "Phase 2 - use fake EAP-Request Identity");
963 109 : buf = os_malloc(sizeof(*hdr) + 1);
964 109 : if (buf == NULL) {
965 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
966 : "memory for fake EAP-Identity Request");
967 0 : return NULL;
968 : }
969 :
970 109 : hdr = (struct eap_hdr *) buf;
971 109 : hdr->code = EAP_CODE_REQUEST;
972 109 : hdr->identifier = 0;
973 109 : hdr->length = host_to_be16(sizeof(*hdr) + 1);
974 109 : buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
975 :
976 109 : return buf;
977 : }
978 :
979 :
980 138 : static int eap_ttls_encrypt_response(struct eap_sm *sm,
981 : struct eap_ttls_data *data,
982 : struct wpabuf *resp, u8 identifier,
983 : struct wpabuf **out_data)
984 : {
985 138 : if (resp == NULL)
986 3 : return 0;
987 :
988 135 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
989 : resp);
990 135 : if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
991 : data->ttls_version, identifier,
992 : resp, out_data)) {
993 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 "
994 : "frame");
995 0 : return -1;
996 : }
997 135 : wpabuf_free(resp);
998 :
999 135 : return 0;
1000 : }
1001 :
1002 :
1003 31 : static int eap_ttls_process_phase2_eap(struct eap_sm *sm,
1004 : struct eap_ttls_data *data,
1005 : struct eap_method_ret *ret,
1006 : struct ttls_parse_avp *parse,
1007 : struct wpabuf **resp)
1008 : {
1009 : struct eap_hdr *hdr;
1010 : size_t len;
1011 :
1012 31 : if (parse->eapdata == NULL) {
1013 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the "
1014 : "packet - dropped");
1015 0 : return -1;
1016 : }
1017 :
1018 62 : wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1019 31 : parse->eapdata, parse->eap_len);
1020 31 : hdr = (struct eap_hdr *) parse->eapdata;
1021 :
1022 31 : if (parse->eap_len < sizeof(*hdr)) {
1023 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP "
1024 : "frame (len=%lu, expected %lu or more) - dropped",
1025 : (unsigned long) parse->eap_len,
1026 : (unsigned long) sizeof(*hdr));
1027 0 : return -1;
1028 : }
1029 31 : len = be_to_host16(hdr->length);
1030 31 : if (len > parse->eap_len) {
1031 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 "
1032 : "EAP frame (EAP hdr len=%lu, EAP data len in "
1033 : "AVP=%lu)",
1034 : (unsigned long) len,
1035 : (unsigned long) parse->eap_len);
1036 0 : return -1;
1037 : }
1038 62 : wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1039 : "identifier=%d length=%lu",
1040 62 : hdr->code, hdr->identifier, (unsigned long) len);
1041 31 : switch (hdr->code) {
1042 : case EAP_CODE_REQUEST:
1043 31 : if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) {
1044 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1045 : "processing failed");
1046 0 : return -1;
1047 : }
1048 31 : break;
1049 : default:
1050 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1051 0 : "Phase 2 EAP header", hdr->code);
1052 0 : return -1;
1053 : }
1054 :
1055 31 : return 0;
1056 : }
1057 :
1058 :
1059 67 : static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
1060 : struct eap_ttls_data *data,
1061 : struct eap_method_ret *ret,
1062 : struct ttls_parse_avp *parse)
1063 : {
1064 : #ifdef EAP_MSCHAPv2
1065 67 : if (parse->mschapv2_error) {
1066 1 : wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1067 : "MS-CHAP-Error - failed");
1068 1 : ret->methodState = METHOD_DONE;
1069 1 : ret->decision = DECISION_FAIL;
1070 : /* Reply with empty data to ACK error */
1071 1 : return 1;
1072 : }
1073 :
1074 66 : if (parse->mschapv2 == NULL) {
1075 : #ifdef EAP_TNC
1076 1 : if (data->phase2_success && parse->eapdata) {
1077 : /*
1078 : * Allow EAP-TNC to be started after successfully
1079 : * completed MSCHAPV2.
1080 : */
1081 1 : return 1;
1082 : }
1083 : #endif /* EAP_TNC */
1084 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP "
1085 : "received for Phase2 MSCHAPV2");
1086 0 : return -1;
1087 : }
1088 65 : if (parse->mschapv2[0] != data->ident) {
1089 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 "
1090 : "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)",
1091 0 : parse->mschapv2[0], data->ident);
1092 0 : return -1;
1093 : }
1094 130 : if (!data->auth_response_valid ||
1095 65 : mschapv2_verify_auth_response(data->auth_response,
1096 65 : parse->mschapv2 + 1, 42)) {
1097 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator "
1098 : "response in Phase 2 MSCHAPV2 success request");
1099 0 : return -1;
1100 : }
1101 :
1102 65 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1103 : "authentication succeeded");
1104 65 : ret->methodState = METHOD_DONE;
1105 65 : ret->decision = DECISION_UNCOND_SUCC;
1106 65 : data->phase2_success = 1;
1107 :
1108 : /*
1109 : * Reply with empty data; authentication server will reply
1110 : * with EAP-Success after this.
1111 : */
1112 65 : return 1;
1113 : #else /* EAP_MSCHAPv2 */
1114 : wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build");
1115 : return -1;
1116 : #endif /* EAP_MSCHAPv2 */
1117 : }
1118 :
1119 :
1120 : #ifdef EAP_TNC
1121 1 : static int eap_ttls_process_tnc_start(struct eap_sm *sm,
1122 : struct eap_ttls_data *data,
1123 : struct eap_method_ret *ret,
1124 : struct ttls_parse_avp *parse,
1125 : struct wpabuf **resp)
1126 : {
1127 : /* TNC uses inner EAP method after non-EAP TTLS phase 2. */
1128 1 : if (parse->eapdata == NULL) {
1129 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1130 : "unexpected tunneled data (no EAP)");
1131 0 : return -1;
1132 : }
1133 :
1134 1 : if (!data->ready_for_tnc) {
1135 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
1136 : "EAP after non-EAP, but not ready for TNC");
1137 0 : return -1;
1138 : }
1139 :
1140 1 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
1141 : "non-EAP method");
1142 1 : data->tnc_started = 1;
1143 :
1144 1 : if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0)
1145 0 : return -1;
1146 :
1147 1 : return 0;
1148 : }
1149 : #endif /* EAP_TNC */
1150 :
1151 :
1152 97 : static int eap_ttls_process_decrypted(struct eap_sm *sm,
1153 : struct eap_ttls_data *data,
1154 : struct eap_method_ret *ret,
1155 : u8 identifier,
1156 : struct ttls_parse_avp *parse,
1157 : struct wpabuf *in_decrypted,
1158 : struct wpabuf **out_data)
1159 : {
1160 97 : struct wpabuf *resp = NULL;
1161 97 : struct eap_peer_config *config = eap_get_config(sm);
1162 : int res;
1163 97 : enum phase2_types phase2_type = data->phase2_type;
1164 :
1165 : #ifdef EAP_TNC
1166 97 : if (data->tnc_started)
1167 2 : phase2_type = EAP_TTLS_PHASE2_EAP;
1168 : #endif /* EAP_TNC */
1169 :
1170 97 : switch (phase2_type) {
1171 : case EAP_TTLS_PHASE2_EAP:
1172 30 : if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) <
1173 : 0)
1174 0 : return -1;
1175 30 : break;
1176 : case EAP_TTLS_PHASE2_MSCHAPV2:
1177 67 : res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse);
1178 : #ifdef EAP_TNC
1179 67 : if (res == 1 && parse->eapdata && data->phase2_success) {
1180 : /*
1181 : * TNC may be required as the next
1182 : * authentication method within the tunnel.
1183 : */
1184 1 : ret->methodState = METHOD_MAY_CONT;
1185 1 : data->ready_for_tnc = 1;
1186 1 : if (eap_ttls_process_tnc_start(sm, data, ret, parse,
1187 : &resp) == 0)
1188 1 : break;
1189 : }
1190 : #endif /* EAP_TNC */
1191 66 : return res;
1192 : case EAP_TTLS_PHASE2_MSCHAP:
1193 : case EAP_TTLS_PHASE2_PAP:
1194 : case EAP_TTLS_PHASE2_CHAP:
1195 : #ifdef EAP_TNC
1196 0 : if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) <
1197 : 0)
1198 0 : return -1;
1199 0 : break;
1200 : #else /* EAP_TNC */
1201 : /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1202 : * requests to the supplicant */
1203 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1204 : "tunneled data");
1205 : return -1;
1206 : #endif /* EAP_TNC */
1207 : }
1208 :
1209 31 : if (resp) {
1210 29 : if (eap_ttls_encrypt_response(sm, data, resp, identifier,
1211 : out_data) < 0)
1212 0 : return -1;
1213 4 : } else if (config->pending_req_identity ||
1214 2 : config->pending_req_password ||
1215 0 : config->pending_req_otp ||
1216 0 : config->pending_req_new_password) {
1217 2 : wpabuf_free(data->pending_phase2_req);
1218 2 : data->pending_phase2_req = wpabuf_dup(in_decrypted);
1219 : }
1220 :
1221 31 : return 0;
1222 : }
1223 :
1224 :
1225 109 : static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
1226 : struct eap_ttls_data *data,
1227 : struct eap_method_ret *ret,
1228 : u8 identifier,
1229 : struct wpabuf **out_data)
1230 : {
1231 109 : int retval = 0;
1232 : struct eap_hdr *hdr;
1233 : struct wpabuf *resp;
1234 :
1235 109 : hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
1236 109 : if (hdr == NULL) {
1237 0 : ret->methodState = METHOD_DONE;
1238 0 : ret->decision = DECISION_FAIL;
1239 0 : return -1;
1240 : }
1241 :
1242 109 : resp = NULL;
1243 109 : if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
1244 0 : wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
1245 : "processing failed");
1246 0 : retval = -1;
1247 : } else {
1248 109 : struct eap_peer_config *config = eap_get_config(sm);
1249 112 : if (resp == NULL &&
1250 5 : (config->pending_req_identity ||
1251 2 : config->pending_req_password ||
1252 0 : config->pending_req_otp ||
1253 0 : config->pending_req_new_password)) {
1254 : /*
1255 : * Use empty buffer to force implicit request
1256 : * processing when EAP request is re-processed after
1257 : * user input.
1258 : */
1259 3 : wpabuf_free(data->pending_phase2_req);
1260 3 : data->pending_phase2_req = wpabuf_alloc(0);
1261 : }
1262 :
1263 109 : retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
1264 : out_data);
1265 : }
1266 :
1267 109 : os_free(hdr);
1268 :
1269 109 : if (retval < 0) {
1270 0 : ret->methodState = METHOD_DONE;
1271 0 : ret->decision = DECISION_FAIL;
1272 : }
1273 :
1274 109 : return retval;
1275 : }
1276 :
1277 :
1278 106 : static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
1279 : struct eap_method_ret *ret, u8 identifier,
1280 : struct wpabuf **out_data)
1281 : {
1282 106 : data->phase2_start = 0;
1283 :
1284 : /*
1285 : * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
1286 : * if TLS part was indeed resuming a previous session. Most
1287 : * Authentication Servers terminate EAP-TTLS before reaching this
1288 : * point, but some do not. Make wpa_supplicant stop phase 2 here, if
1289 : * needed.
1290 : */
1291 116 : if (data->reauth &&
1292 10 : tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
1293 0 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
1294 : "skip phase 2");
1295 0 : *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
1296 : data->ttls_version);
1297 0 : ret->methodState = METHOD_DONE;
1298 0 : ret->decision = DECISION_UNCOND_SUCC;
1299 0 : data->phase2_success = 1;
1300 0 : return 0;
1301 : }
1302 :
1303 106 : return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
1304 : out_data);
1305 : }
1306 :
1307 :
1308 210 : static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
1309 : struct eap_method_ret *ret, u8 identifier,
1310 : const struct wpabuf *in_data,
1311 : struct wpabuf **out_data)
1312 : {
1313 210 : struct wpabuf *in_decrypted = NULL;
1314 210 : int retval = 0;
1315 : struct ttls_parse_avp parse;
1316 :
1317 210 : os_memset(&parse, 0, sizeof(parse));
1318 :
1319 210 : wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
1320 : " Phase 2",
1321 : in_data ? (unsigned long) wpabuf_len(in_data) : 0);
1322 :
1323 210 : if (data->pending_phase2_req) {
1324 5 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
1325 : "skip decryption and use old data");
1326 : /* Clear TLS reassembly state. */
1327 5 : eap_peer_tls_reset_input(&data->ssl);
1328 :
1329 5 : in_decrypted = data->pending_phase2_req;
1330 5 : data->pending_phase2_req = NULL;
1331 5 : if (wpabuf_len(in_decrypted) == 0) {
1332 3 : wpabuf_free(in_decrypted);
1333 3 : return eap_ttls_implicit_identity_request(
1334 : sm, data, ret, identifier, out_data);
1335 : }
1336 2 : goto continue_req;
1337 : }
1338 :
1339 315 : if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
1340 110 : data->phase2_start) {
1341 106 : return eap_ttls_phase2_start(sm, data, ret, identifier,
1342 : out_data);
1343 : }
1344 :
1345 99 : if (in_data == NULL || wpabuf_len(in_data) == 0) {
1346 : /* Received TLS ACK - requesting more fragments */
1347 4 : return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
1348 : data->ttls_version,
1349 : identifier, NULL, out_data);
1350 : }
1351 :
1352 95 : retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1353 95 : if (retval)
1354 0 : goto done;
1355 :
1356 : continue_req:
1357 97 : data->phase2_start = 0;
1358 :
1359 97 : if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
1360 0 : retval = -1;
1361 0 : goto done;
1362 : }
1363 :
1364 97 : retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
1365 : &parse, in_decrypted, out_data);
1366 :
1367 : done:
1368 97 : wpabuf_free(in_decrypted);
1369 97 : os_free(parse.eapdata);
1370 :
1371 97 : if (retval < 0) {
1372 0 : ret->methodState = METHOD_DONE;
1373 0 : ret->decision = DECISION_FAIL;
1374 : }
1375 :
1376 97 : return retval;
1377 : }
1378 :
1379 :
1380 486 : static int eap_ttls_process_handshake(struct eap_sm *sm,
1381 : struct eap_ttls_data *data,
1382 : struct eap_method_ret *ret,
1383 : u8 identifier,
1384 : const u8 *in_data, size_t in_len,
1385 : struct wpabuf **out_data)
1386 : {
1387 : int res;
1388 :
1389 486 : res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
1390 : data->ttls_version, identifier,
1391 : in_data, in_len, out_data);
1392 :
1393 486 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1394 106 : wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
1395 : "Phase 2");
1396 106 : if (data->resuming) {
1397 10 : wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
1398 : "skip Phase 2");
1399 10 : ret->decision = DECISION_COND_SUCC;
1400 10 : ret->methodState = METHOD_MAY_CONT;
1401 : }
1402 106 : data->phase2_start = 1;
1403 106 : eap_ttls_v0_derive_key(sm, data);
1404 :
1405 106 : if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
1406 106 : if (eap_ttls_decrypt(sm, data, ret, identifier,
1407 : NULL, out_data)) {
1408 0 : wpa_printf(MSG_WARNING, "EAP-TTLS: "
1409 : "failed to process early "
1410 : "start for Phase 2");
1411 : }
1412 106 : res = 0;
1413 : }
1414 106 : data->resuming = 0;
1415 : }
1416 :
1417 486 : if (res == 2) {
1418 : struct wpabuf msg;
1419 : /*
1420 : * Application data included in the handshake message.
1421 : */
1422 0 : wpabuf_free(data->pending_phase2_req);
1423 0 : data->pending_phase2_req = *out_data;
1424 0 : *out_data = NULL;
1425 0 : wpabuf_set(&msg, in_data, in_len);
1426 0 : res = eap_ttls_decrypt(sm, data, ret, identifier, &msg,
1427 : out_data);
1428 : }
1429 :
1430 486 : return res;
1431 : }
1432 :
1433 :
1434 590 : static void eap_ttls_check_auth_status(struct eap_sm *sm,
1435 : struct eap_ttls_data *data,
1436 : struct eap_method_ret *ret)
1437 : {
1438 590 : if (ret->methodState == METHOD_DONE) {
1439 104 : ret->allowNotifications = FALSE;
1440 137 : if (ret->decision == DECISION_UNCOND_SUCC ||
1441 33 : ret->decision == DECISION_COND_SUCC) {
1442 102 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1443 : "completed successfully");
1444 102 : data->phase2_success = 1;
1445 : #ifdef EAP_TNC
1446 102 : if (!data->ready_for_tnc && !data->tnc_started) {
1447 : /*
1448 : * TNC may be required as the next
1449 : * authentication method within the tunnel.
1450 : */
1451 102 : ret->methodState = METHOD_MAY_CONT;
1452 102 : data->ready_for_tnc = 1;
1453 : }
1454 : #endif /* EAP_TNC */
1455 : }
1456 972 : } else if (ret->methodState == METHOD_MAY_CONT &&
1457 971 : (ret->decision == DECISION_UNCOND_SUCC ||
1458 485 : ret->decision == DECISION_COND_SUCC)) {
1459 72 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1460 : "completed successfully (MAY_CONT)");
1461 72 : data->phase2_success = 1;
1462 : }
1463 590 : }
1464 :
1465 :
1466 590 : static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
1467 : struct eap_method_ret *ret,
1468 : const struct wpabuf *reqData)
1469 : {
1470 : size_t left;
1471 : int res;
1472 : u8 flags, id;
1473 : struct wpabuf *resp;
1474 : const u8 *pos;
1475 590 : struct eap_ttls_data *data = priv;
1476 :
1477 590 : pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
1478 : reqData, &left, &flags);
1479 590 : if (pos == NULL)
1480 0 : return NULL;
1481 590 : id = eap_get_id(reqData);
1482 :
1483 590 : if (flags & EAP_TLS_FLAGS_START) {
1484 116 : wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own "
1485 : "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1486 : data->ttls_version);
1487 :
1488 : /* RFC 5281, Ch. 9.2:
1489 : * "This packet MAY contain additional information in the form
1490 : * of AVPs, which may provide useful hints to the client"
1491 : * For now, ignore any potential extra data.
1492 : */
1493 116 : left = 0;
1494 : }
1495 :
1496 590 : resp = NULL;
1497 704 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1498 218 : !data->resuming) {
1499 : struct wpabuf msg;
1500 104 : wpabuf_set(&msg, pos, left);
1501 104 : res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
1502 : } else {
1503 486 : res = eap_ttls_process_handshake(sm, data, ret, id,
1504 : pos, left, &resp);
1505 : }
1506 :
1507 590 : eap_ttls_check_auth_status(sm, data, ret);
1508 :
1509 : /* FIX: what about res == -1? Could just move all error processing into
1510 : * the other functions and get rid of this res==1 case here. */
1511 590 : if (res == 1) {
1512 172 : wpabuf_free(resp);
1513 172 : return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
1514 : data->ttls_version);
1515 : }
1516 418 : return resp;
1517 : }
1518 :
1519 :
1520 26 : static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1521 : {
1522 26 : struct eap_ttls_data *data = priv;
1523 52 : return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1524 26 : data->phase2_success;
1525 : }
1526 :
1527 :
1528 16 : static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1529 : {
1530 16 : struct eap_ttls_data *data = priv;
1531 16 : wpabuf_free(data->pending_phase2_req);
1532 16 : data->pending_phase2_req = NULL;
1533 : #ifdef EAP_TNC
1534 16 : data->ready_for_tnc = 0;
1535 16 : data->tnc_started = 0;
1536 : #endif /* EAP_TNC */
1537 16 : }
1538 :
1539 :
1540 10 : static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1541 : {
1542 10 : struct eap_ttls_data *data = priv;
1543 10 : os_free(data->key_data);
1544 10 : data->key_data = NULL;
1545 10 : os_free(data->session_id);
1546 10 : data->session_id = NULL;
1547 10 : if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1548 0 : os_free(data);
1549 0 : return NULL;
1550 : }
1551 13 : if (data->phase2_priv && data->phase2_method &&
1552 3 : data->phase2_method->init_for_reauth)
1553 0 : data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1554 10 : data->phase2_start = 0;
1555 10 : data->phase2_success = 0;
1556 10 : data->resuming = 1;
1557 10 : data->reauth = 1;
1558 10 : return priv;
1559 : }
1560 :
1561 :
1562 59 : static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1563 : size_t buflen, int verbose)
1564 : {
1565 59 : struct eap_ttls_data *data = priv;
1566 : int len, ret;
1567 :
1568 59 : len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1569 59 : ret = os_snprintf(buf + len, buflen - len,
1570 : "EAP-TTLSv%d Phase2 method=",
1571 : data->ttls_version);
1572 59 : if (ret < 0 || (size_t) ret >= buflen - len)
1573 0 : return len;
1574 59 : len += ret;
1575 59 : switch (data->phase2_type) {
1576 : case EAP_TTLS_PHASE2_EAP:
1577 18 : ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
1578 9 : data->phase2_method ?
1579 9 : data->phase2_method->name : "?");
1580 9 : break;
1581 : case EAP_TTLS_PHASE2_MSCHAPV2:
1582 37 : ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
1583 37 : break;
1584 : case EAP_TTLS_PHASE2_MSCHAP:
1585 4 : ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
1586 4 : break;
1587 : case EAP_TTLS_PHASE2_PAP:
1588 4 : ret = os_snprintf(buf + len, buflen - len, "PAP\n");
1589 4 : break;
1590 : case EAP_TTLS_PHASE2_CHAP:
1591 5 : ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
1592 5 : break;
1593 : default:
1594 0 : ret = 0;
1595 0 : break;
1596 : }
1597 59 : if (ret < 0 || (size_t) ret >= buflen - len)
1598 0 : return len;
1599 59 : len += ret;
1600 :
1601 59 : return len;
1602 : }
1603 :
1604 :
1605 590 : static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1606 : {
1607 590 : struct eap_ttls_data *data = priv;
1608 590 : return data->key_data != NULL && data->phase2_success;
1609 : }
1610 :
1611 :
1612 184 : static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1613 : {
1614 184 : struct eap_ttls_data *data = priv;
1615 : u8 *key;
1616 :
1617 184 : if (data->key_data == NULL || !data->phase2_success)
1618 0 : return NULL;
1619 :
1620 184 : key = os_malloc(EAP_TLS_KEY_LEN);
1621 184 : if (key == NULL)
1622 0 : return NULL;
1623 :
1624 184 : *len = EAP_TLS_KEY_LEN;
1625 184 : os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1626 :
1627 184 : return key;
1628 : }
1629 :
1630 :
1631 184 : static u8 * eap_ttls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1632 : {
1633 184 : struct eap_ttls_data *data = priv;
1634 : u8 *id;
1635 :
1636 184 : if (data->session_id == NULL || !data->phase2_success)
1637 0 : return NULL;
1638 :
1639 184 : id = os_malloc(data->id_len);
1640 184 : if (id == NULL)
1641 0 : return NULL;
1642 :
1643 184 : *len = data->id_len;
1644 184 : os_memcpy(id, data->session_id, data->id_len);
1645 :
1646 184 : return id;
1647 : }
1648 :
1649 :
1650 4 : int eap_peer_ttls_register(void)
1651 : {
1652 : struct eap_method *eap;
1653 : int ret;
1654 :
1655 4 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1656 : EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
1657 4 : if (eap == NULL)
1658 0 : return -1;
1659 :
1660 4 : eap->init = eap_ttls_init;
1661 4 : eap->deinit = eap_ttls_deinit;
1662 4 : eap->process = eap_ttls_process;
1663 4 : eap->isKeyAvailable = eap_ttls_isKeyAvailable;
1664 4 : eap->getKey = eap_ttls_getKey;
1665 4 : eap->getSessionId = eap_ttls_get_session_id;
1666 4 : eap->get_status = eap_ttls_get_status;
1667 4 : eap->has_reauth_data = eap_ttls_has_reauth_data;
1668 4 : eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
1669 4 : eap->init_for_reauth = eap_ttls_init_for_reauth;
1670 :
1671 4 : ret = eap_peer_method_register(eap);
1672 4 : if (ret)
1673 0 : eap_peer_method_free(eap);
1674 4 : return ret;
1675 : }
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