1 /*
2 * EAP-TEAP server (RFC 7170)
3 * Copyright (c) 2004-2019, 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/aes_wrap.h"
13 #include "crypto/tls.h"
14 #include "crypto/random.h"
15 #include "eap_common/eap_teap_common.h"
16 #include "eap_i.h"
17 #include "eap_tls_common.h"
18
19
20 static void eap_teap_reset(struct eap_sm *sm, void *priv);
21
22
23 /* Private PAC-Opaque TLV types */
24 #define PAC_OPAQUE_TYPE_PAD 0
25 #define PAC_OPAQUE_TYPE_KEY 1
26 #define PAC_OPAQUE_TYPE_LIFETIME 2
27 #define PAC_OPAQUE_TYPE_IDENTITY 3
28
29 struct eap_teap_data {
30 struct eap_ssl_data ssl;
31 enum {
32 START, PHASE1, PHASE1B, PHASE2_START, PHASE2_ID,
33 PHASE2_BASIC_AUTH, PHASE2_METHOD, CRYPTO_BINDING, REQUEST_PAC,
34 FAILURE_SEND_RESULT, SUCCESS_SEND_RESULT, SUCCESS, FAILURE
35 } state;
36
37 u8 teap_version;
38 u8 peer_version;
39 u16 tls_cs;
40
41 const struct eap_method *phase2_method;
42 void *phase2_priv;
43
44 u8 crypto_binding_nonce[32];
45 int final_result;
46
47 u8 simck_msk[EAP_TEAP_SIMCK_LEN];
48 u8 cmk_msk[EAP_TEAP_CMK_LEN];
49 u8 simck_emsk[EAP_TEAP_SIMCK_LEN];
50 u8 cmk_emsk[EAP_TEAP_CMK_LEN];
51 int simck_idx;
52 int cmk_emsk_available;
53
54 u8 pac_opaque_encr[16];
55 u8 *srv_id;
56 size_t srv_id_len;
57 char *srv_id_info;
58
59 unsigned int basic_auth_not_done:1;
60 unsigned int inner_eap_not_done:1;
61 int anon_provisioning;
62 int skipped_inner_auth;
63 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
64 struct wpabuf *pending_phase2_resp;
65 struct wpabuf *server_outer_tlvs;
66 struct wpabuf *peer_outer_tlvs;
67 u8 *identity; /* from PAC-Opaque or client certificate */
68 size_t identity_len;
69 int eap_seq;
70 int tnc_started;
71
72 int pac_key_lifetime;
73 int pac_key_refresh_time;
74
75 enum teap_error_codes error_code;
76 enum teap_identity_types cur_id_type;
77 };
78
79
80 static int eap_teap_process_phase2_start(struct eap_sm *sm,
81 struct eap_teap_data *data);
82
83
eap_teap_state_txt(int state)84 static const char * eap_teap_state_txt(int state)
85 {
86 switch (state) {
87 case START:
88 return "START";
89 case PHASE1:
90 return "PHASE1";
91 case PHASE1B:
92 return "PHASE1B";
93 case PHASE2_START:
94 return "PHASE2_START";
95 case PHASE2_ID:
96 return "PHASE2_ID";
97 case PHASE2_BASIC_AUTH:
98 return "PHASE2_BASIC_AUTH";
99 case PHASE2_METHOD:
100 return "PHASE2_METHOD";
101 case CRYPTO_BINDING:
102 return "CRYPTO_BINDING";
103 case REQUEST_PAC:
104 return "REQUEST_PAC";
105 case FAILURE_SEND_RESULT:
106 return "FAILURE_SEND_RESULT";
107 case SUCCESS_SEND_RESULT:
108 return "SUCCESS_SEND_RESULT";
109 case SUCCESS:
110 return "SUCCESS";
111 case FAILURE:
112 return "FAILURE";
113 default:
114 return "Unknown?!";
115 }
116 }
117
118
eap_teap_state(struct eap_teap_data * data,int state)119 static void eap_teap_state(struct eap_teap_data *data, int state)
120 {
121 wpa_printf(MSG_DEBUG, "EAP-TEAP: %s -> %s",
122 eap_teap_state_txt(data->state),
123 eap_teap_state_txt(state));
124 data->state = state;
125 }
126
127
eap_teap_req_failure(struct eap_teap_data * data,enum teap_error_codes error)128 static enum eap_type eap_teap_req_failure(struct eap_teap_data *data,
129 enum teap_error_codes error)
130 {
131 eap_teap_state(data, FAILURE_SEND_RESULT);
132 return EAP_TYPE_NONE;
133 }
134
135
eap_teap_session_ticket_cb(void * ctx,const u8 * ticket,size_t len,const u8 * client_random,const u8 * server_random,u8 * master_secret)136 static int eap_teap_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
137 const u8 *client_random,
138 const u8 *server_random,
139 u8 *master_secret)
140 {
141 struct eap_teap_data *data = ctx;
142 const u8 *pac_opaque;
143 size_t pac_opaque_len;
144 u8 *buf, *pos, *end, *pac_key = NULL;
145 os_time_t lifetime = 0;
146 struct os_time now;
147 u8 *identity = NULL;
148 size_t identity_len = 0;
149
150 wpa_printf(MSG_DEBUG, "EAP-TEAP: SessionTicket callback");
151 wpa_hexdump(MSG_DEBUG, "EAP-TEAP: SessionTicket (PAC-Opaque)",
152 ticket, len);
153
154 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
155 wpa_printf(MSG_DEBUG, "EAP-TEAP: Ignore invalid SessionTicket");
156 return 0;
157 }
158
159 pac_opaque_len = WPA_GET_BE16(ticket + 2);
160 pac_opaque = ticket + 4;
161 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
162 pac_opaque_len > len - 4) {
163 wpa_printf(MSG_DEBUG,
164 "EAP-TEAP: Ignore invalid PAC-Opaque (len=%lu left=%lu)",
165 (unsigned long) pac_opaque_len,
166 (unsigned long) len);
167 return 0;
168 }
169 wpa_hexdump(MSG_DEBUG, "EAP-TEAP: Received PAC-Opaque",
170 pac_opaque, pac_opaque_len);
171
172 buf = os_malloc(pac_opaque_len - 8);
173 if (!buf) {
174 wpa_printf(MSG_DEBUG,
175 "EAP-TEAP: Failed to allocate memory for decrypting PAC-Opaque");
176 return 0;
177 }
178
179 if (aes_unwrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
180 (pac_opaque_len - 8) / 8, pac_opaque, buf) < 0) {
181 wpa_printf(MSG_DEBUG, "EAP-TEAP: Failed to decrypt PAC-Opaque");
182 os_free(buf);
183 /*
184 * This may have been caused by server changing the PAC-Opaque
185 * encryption key, so just ignore this PAC-Opaque instead of
186 * failing the authentication completely. Provisioning can now
187 * be used to provision a new PAC.
188 */
189 return 0;
190 }
191
192 end = buf + pac_opaque_len - 8;
193 wpa_hexdump_key(MSG_DEBUG, "EAP-TEAP: Decrypted PAC-Opaque",
194 buf, end - buf);
195
196 pos = buf;
197 while (end - pos > 1) {
198 u8 id, elen;
199
200 id = *pos++;
201 elen = *pos++;
202 if (elen > end - pos)
203 break;
204
205 switch (id) {
206 case PAC_OPAQUE_TYPE_PAD:
207 goto done;
208 case PAC_OPAQUE_TYPE_KEY:
209 if (elen != EAP_TEAP_PAC_KEY_LEN) {
210 wpa_printf(MSG_DEBUG,
211 "EAP-TEAP: Invalid PAC-Key length %d",
212 elen);
213 os_free(buf);
214 return -1;
215 }
216 pac_key = pos;
217 wpa_hexdump_key(MSG_DEBUG,
218 "EAP-TEAP: PAC-Key from decrypted PAC-Opaque",
219 pac_key, EAP_TEAP_PAC_KEY_LEN);
220 break;
221 case PAC_OPAQUE_TYPE_LIFETIME:
222 if (elen != 4) {
223 wpa_printf(MSG_DEBUG,
224 "EAP-TEAP: Invalid PAC-Key lifetime length %d",
225 elen);
226 os_free(buf);
227 return -1;
228 }
229 lifetime = WPA_GET_BE32(pos);
230 break;
231 case PAC_OPAQUE_TYPE_IDENTITY:
232 identity = pos;
233 identity_len = elen;
234 break;
235 }
236
237 pos += elen;
238 }
239 done:
240
241 if (!pac_key) {
242 wpa_printf(MSG_DEBUG,
243 "EAP-TEAP: No PAC-Key included in PAC-Opaque");
244 os_free(buf);
245 return -1;
246 }
247
248 if (identity) {
249 wpa_hexdump_ascii(MSG_DEBUG,
250 "EAP-TEAP: Identity from PAC-Opaque",
251 identity, identity_len);
252 os_free(data->identity);
253 data->identity = os_malloc(identity_len);
254 if (data->identity) {
255 os_memcpy(data->identity, identity, identity_len);
256 data->identity_len = identity_len;
257 }
258 }
259
260 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
261 wpa_printf(MSG_DEBUG,
262 "EAP-TEAP: PAC-Key not valid anymore (lifetime=%ld now=%ld)",
263 lifetime, now.sec);
264 data->send_new_pac = 2;
265 /*
266 * Allow PAC to be used to allow a PAC update with some level
267 * of server authentication (i.e., do not fall back to full TLS
268 * handshake since we cannot be sure that the peer would be
269 * able to validate server certificate now). However, reject
270 * the authentication since the PAC was not valid anymore. Peer
271 * can connect again with the newly provisioned PAC after this.
272 */
273 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
274 wpa_printf(MSG_DEBUG,
275 "EAP-TEAP: PAC-Key soft timeout; send an update if authentication succeeds");
276 data->send_new_pac = 1;
277 }
278
279 /* EAP-TEAP uses PAC-Key as the TLS master_secret */
280 os_memcpy(master_secret, pac_key, EAP_TEAP_PAC_KEY_LEN);
281
282 os_free(buf);
283
284 return 1;
285 }
286
287
eap_teap_derive_key_auth(struct eap_sm * sm,struct eap_teap_data * data)288 static int eap_teap_derive_key_auth(struct eap_sm *sm,
289 struct eap_teap_data *data)
290 {
291 int res;
292
293 /* RFC 7170, Section 5.1 */
294 res = tls_connection_export_key(sm->cfg->ssl_ctx, data->ssl.conn,
295 TEAP_TLS_EXPORTER_LABEL_SKS, NULL, 0,
296 data->simck_msk, EAP_TEAP_SIMCK_LEN);
297 if (res)
298 return res;
299 wpa_hexdump_key(MSG_DEBUG,
300 "EAP-TEAP: session_key_seed (S-IMCK[0])",
301 data->simck_msk, EAP_TEAP_SIMCK_LEN);
302 os_memcpy(data->simck_emsk, data->simck_msk, EAP_TEAP_SIMCK_LEN);
303 data->simck_idx = 0;
304 return 0;
305 }
306
307
eap_teap_update_icmk(struct eap_sm * sm,struct eap_teap_data * data)308 static int eap_teap_update_icmk(struct eap_sm *sm, struct eap_teap_data *data)
309 {
310 u8 *msk = NULL, *emsk = NULL;
311 size_t msk_len = 0, emsk_len = 0;
312 int res;
313
314 wpa_printf(MSG_DEBUG, "EAP-TEAP: Deriving ICMK[%d] (S-IMCK and CMK)",
315 data->simck_idx + 1);
316
317 if (sm->cfg->eap_teap_auth == 1)
318 return eap_teap_derive_cmk_basic_pw_auth(data->tls_cs,
319 data->simck_msk,
320 data->cmk_msk);
321
322 if (!data->phase2_method || !data->phase2_priv) {
323 wpa_printf(MSG_INFO, "EAP-TEAP: Phase 2 method not available");
324 return -1;
325 }
326
327 if (data->phase2_method->getKey) {
328 msk = data->phase2_method->getKey(sm, data->phase2_priv,
329 &msk_len);
330 if (!msk) {
331 wpa_printf(MSG_INFO,
332 "EAP-TEAP: Could not fetch Phase 2 MSK");
333 return -1;
334 }
335 }
336
337 if (data->phase2_method->get_emsk) {
338 emsk = data->phase2_method->get_emsk(sm, data->phase2_priv,
339 &emsk_len);
340 }
341
342 res = eap_teap_derive_imck(data->tls_cs,
343 data->simck_msk, data->simck_emsk,
344 msk, msk_len, emsk, emsk_len,
345 data->simck_msk, data->cmk_msk,
346 data->simck_emsk, data->cmk_emsk);
347 bin_clear_free(msk, msk_len);
348 bin_clear_free(emsk, emsk_len);
349 if (res == 0) {
350 data->simck_idx++;
351 if (emsk)
352 data->cmk_emsk_available = 1;
353 }
354 return 0;
355 }
356
357
eap_teap_init(struct eap_sm * sm)358 static void * eap_teap_init(struct eap_sm *sm)
359 {
360 struct eap_teap_data *data;
361
362 data = os_zalloc(sizeof(*data));
363 if (!data)
364 return NULL;
365 data->teap_version = EAP_TEAP_VERSION;
366 data->state = START;
367
368 if (eap_server_tls_ssl_init(sm, &data->ssl,
369 sm->cfg->eap_teap_auth == 2 ? 2 : 0,
370 EAP_TYPE_TEAP)) {
371 wpa_printf(MSG_INFO, "EAP-TEAP: Failed to initialize SSL.");
372 eap_teap_reset(sm, data);
373 return NULL;
374 }
375
376 /* TODO: Add anon-DH TLS cipher suites (and if one is negotiated,
377 * enforce inner EAP with mutual authentication to be used) */
378
379 if (tls_connection_set_session_ticket_cb(sm->cfg->ssl_ctx,
380 data->ssl.conn,
381 eap_teap_session_ticket_cb,
382 data) < 0) {
383 wpa_printf(MSG_INFO,
384 "EAP-TEAP: Failed to set SessionTicket callback");
385 eap_teap_reset(sm, data);
386 return NULL;
387 }
388
389 if (!sm->cfg->pac_opaque_encr_key) {
390 wpa_printf(MSG_INFO,
391 "EAP-TEAP: No PAC-Opaque encryption key configured");
392 eap_teap_reset(sm, data);
393 return NULL;
394 }
395 os_memcpy(data->pac_opaque_encr, sm->cfg->pac_opaque_encr_key,
396 sizeof(data->pac_opaque_encr));
397
398 if (!sm->cfg->eap_fast_a_id) {
399 wpa_printf(MSG_INFO, "EAP-TEAP: No A-ID configured");
400 eap_teap_reset(sm, data);
401 return NULL;
402 }
403 data->srv_id = os_malloc(sm->cfg->eap_fast_a_id_len);
404 if (!data->srv_id) {
405 eap_teap_reset(sm, data);
406 return NULL;
407 }
408 os_memcpy(data->srv_id, sm->cfg->eap_fast_a_id,
409 sm->cfg->eap_fast_a_id_len);
410 data->srv_id_len = sm->cfg->eap_fast_a_id_len;
411
412 if (!sm->cfg->eap_fast_a_id_info) {
413 wpa_printf(MSG_INFO, "EAP-TEAP: No A-ID-Info configured");
414 eap_teap_reset(sm, data);
415 return NULL;
416 }
417 data->srv_id_info = os_strdup(sm->cfg->eap_fast_a_id_info);
418 if (!data->srv_id_info) {
419 eap_teap_reset(sm, data);
420 return NULL;
421 }
422
423 /* PAC-Key lifetime in seconds (hard limit) */
424 data->pac_key_lifetime = sm->cfg->pac_key_lifetime;
425
426 /*
427 * PAC-Key refresh time in seconds (soft limit on remaining hard
428 * limit). The server will generate a new PAC-Key when this number of
429 * seconds (or fewer) of the lifetime remains.
430 */
431 data->pac_key_refresh_time = sm->cfg->pac_key_refresh_time;
432
433 return data;
434 }
435
436
eap_teap_reset(struct eap_sm * sm,void * priv)437 static void eap_teap_reset(struct eap_sm *sm, void *priv)
438 {
439 struct eap_teap_data *data = priv;
440
441 if (!data)
442 return;
443 if (data->phase2_priv && data->phase2_method)
444 data->phase2_method->reset(sm, data->phase2_priv);
445 eap_server_tls_ssl_deinit(sm, &data->ssl);
446 os_free(data->srv_id);
447 os_free(data->srv_id_info);
448 wpabuf_free(data->pending_phase2_resp);
449 wpabuf_free(data->server_outer_tlvs);
450 wpabuf_free(data->peer_outer_tlvs);
451 os_free(data->identity);
452 forced_memzero(data->simck_msk, EAP_TEAP_SIMCK_LEN);
453 forced_memzero(data->simck_emsk, EAP_TEAP_SIMCK_LEN);
454 forced_memzero(data->cmk_msk, EAP_TEAP_CMK_LEN);
455 forced_memzero(data->cmk_emsk, EAP_TEAP_CMK_LEN);
456 forced_memzero(data->pac_opaque_encr, sizeof(data->pac_opaque_encr));
457 bin_clear_free(data, sizeof(*data));
458 }
459
460
eap_teap_build_start(struct eap_sm * sm,struct eap_teap_data * data,u8 id)461 static struct wpabuf * eap_teap_build_start(struct eap_sm *sm,
462 struct eap_teap_data *data, u8 id)
463 {
464 struct wpabuf *req;
465 size_t outer_tlv_len = sizeof(struct teap_tlv_hdr) + data->srv_id_len;
466 const u8 *start, *end;
467
468 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TEAP,
469 1 + 4 + outer_tlv_len, EAP_CODE_REQUEST, id);
470 if (!req) {
471 wpa_printf(MSG_ERROR,
472 "EAP-TEAP: Failed to allocate memory for request");
473 eap_teap_state(data, FAILURE);
474 return NULL;
475 }
476
477 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | EAP_TEAP_FLAGS_OUTER_TLV_LEN |
478 data->teap_version);
479 wpabuf_put_be32(req, outer_tlv_len);
480
481 start = wpabuf_put(req, 0);
482
483 /* RFC 7170, Section 4.2.2: Authority-ID TLV */
484 eap_teap_put_tlv(req, TEAP_TLV_AUTHORITY_ID,
485 data->srv_id, data->srv_id_len);
486
487 end = wpabuf_put(req, 0);
488 wpabuf_free(data->server_outer_tlvs);
489 data->server_outer_tlvs = wpabuf_alloc_copy(start, end - start);
490 if (!data->server_outer_tlvs) {
491 eap_teap_state(data, FAILURE);
492 return NULL;
493 }
494
495 eap_teap_state(data, PHASE1);
496
497 return req;
498 }
499
500
eap_teap_phase1_done(struct eap_sm * sm,struct eap_teap_data * data)501 static int eap_teap_phase1_done(struct eap_sm *sm, struct eap_teap_data *data)
502 {
503 char cipher[64];
504
505 wpa_printf(MSG_DEBUG, "EAP-TEAP: Phase 1 done, starting Phase 2");
506
507 if (!data->identity && sm->cfg->eap_teap_auth == 2) {
508 const char *subject;
509
510 subject = tls_connection_get_peer_subject(data->ssl.conn);
511 if (subject) {
512 wpa_printf(MSG_DEBUG,
513 "EAP-TEAP: Peer subject from Phase 1 client certificate: '%s'",
514 subject);
515 data->identity = (u8 *) os_strdup(subject);
516 data->identity_len = os_strlen(subject);
517 }
518 }
519
520 data->tls_cs = tls_connection_get_cipher_suite(data->ssl.conn);
521 wpa_printf(MSG_DEBUG, "EAP-TEAP: TLS cipher suite 0x%04x",
522 data->tls_cs);
523
524 if (tls_get_cipher(sm->cfg->ssl_ctx, data->ssl.conn,
525 cipher, sizeof(cipher)) < 0) {
526 wpa_printf(MSG_DEBUG,
527 "EAP-TEAP: Failed to get cipher information");
528 eap_teap_state(data, FAILURE);
529 return -1;
530 }
531 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
532
533 if (data->anon_provisioning)
534 wpa_printf(MSG_DEBUG, "EAP-TEAP: Anonymous provisioning");
535
536 if (eap_teap_derive_key_auth(sm, data) < 0) {
537 eap_teap_state(data, FAILURE);
538 return -1;
539 }
540
541 eap_teap_state(data, PHASE2_START);
542
543 return 0;
544 }
545
546
eap_teap_build_phase2_req(struct eap_sm * sm,struct eap_teap_data * data,u8 id)547 static struct wpabuf * eap_teap_build_phase2_req(struct eap_sm *sm,
548 struct eap_teap_data *data,
549 u8 id)
550 {
551 struct wpabuf *req, *id_tlv = NULL;
552
553 if (sm->cfg->eap_teap_auth == 1 ||
554 (data->phase2_priv && data->phase2_method &&
555 data->phase2_method->vendor == EAP_VENDOR_IETF &&
556 data->phase2_method->method == EAP_TYPE_IDENTITY)) {
557 switch (sm->cfg->eap_teap_id) {
558 case EAP_TEAP_ID_ALLOW_ANY:
559 break;
560 case EAP_TEAP_ID_REQUIRE_USER:
561 case EAP_TEAP_ID_REQUEST_USER_ACCEPT_MACHINE:
562 data->cur_id_type = TEAP_IDENTITY_TYPE_USER;
563 id_tlv = eap_teap_tlv_identity_type(data->cur_id_type);
564 break;
565 case EAP_TEAP_ID_REQUIRE_MACHINE:
566 case EAP_TEAP_ID_REQUEST_MACHINE_ACCEPT_USER:
567 data->cur_id_type = TEAP_IDENTITY_TYPE_MACHINE;
568 id_tlv = eap_teap_tlv_identity_type(data->cur_id_type);
569 break;
570 case EAP_TEAP_ID_REQUIRE_USER_AND_MACHINE:
571 if (data->cur_id_type == TEAP_IDENTITY_TYPE_USER)
572 data->cur_id_type = TEAP_IDENTITY_TYPE_MACHINE;
573 else
574 data->cur_id_type = TEAP_IDENTITY_TYPE_USER;
575 id_tlv = eap_teap_tlv_identity_type(data->cur_id_type);
576 break;
577 }
578 }
579
580 if (sm->cfg->eap_teap_auth == 1) {
581 wpa_printf(MSG_DEBUG, "EAP-TEAP: Initiate Basic-Password-Auth");
582 data->basic_auth_not_done = 1;
583 req = wpabuf_alloc(sizeof(struct teap_tlv_hdr));
584 if (!req) {
585 wpabuf_free(id_tlv);
586 return NULL;
587 }
588 eap_teap_put_tlv_hdr(req, TEAP_TLV_BASIC_PASSWORD_AUTH_REQ, 0);
589 return wpabuf_concat(req, id_tlv);
590 }
591
592 wpa_printf(MSG_DEBUG, "EAP-TEAP: Initiate inner EAP method");
593 data->inner_eap_not_done = 1;
594 if (!data->phase2_priv) {
595 wpa_printf(MSG_DEBUG,
596 "EAP-TEAP: Phase 2 method not initialized");
597 wpabuf_free(id_tlv);
598 return NULL;
599 }
600
601 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
602 if (!req) {
603 wpabuf_free(id_tlv);
604 return NULL;
605 }
606
607 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-TEAP: Phase 2 EAP-Request", req);
608
609 return wpabuf_concat(eap_teap_tlv_eap_payload(req), id_tlv);
610 }
611
612
eap_teap_build_crypto_binding(struct eap_sm * sm,struct eap_teap_data * data)613 static struct wpabuf * eap_teap_build_crypto_binding(
614 struct eap_sm *sm, struct eap_teap_data *data)
615 {
616 struct wpabuf *buf;
617 struct teap_tlv_result *result;
618 struct teap_tlv_crypto_binding *cb;
619 u8 subtype, flags;
620
621 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*cb));
622 if (!buf)
623 return NULL;
624
625 if (data->send_new_pac || data->anon_provisioning ||
626 data->basic_auth_not_done || data->inner_eap_not_done ||
627 data->phase2_method || sm->cfg->eap_teap_separate_result)
628 data->final_result = 0;
629 else
630 data->final_result = 1;
631
632 if (!data->final_result || data->eap_seq > 0 ||
633 sm->cfg->eap_teap_auth == 1) {
634 /* Intermediate-Result */
635 wpa_printf(MSG_DEBUG,
636 "EAP-TEAP: Add Intermediate-Result TLV (status=SUCCESS)");
637 result = wpabuf_put(buf, sizeof(*result));
638 result->tlv_type = host_to_be16(TEAP_TLV_MANDATORY |
639 TEAP_TLV_INTERMEDIATE_RESULT);
640 result->length = host_to_be16(2);
641 result->status = host_to_be16(TEAP_STATUS_SUCCESS);
642 }
643
644 if (data->final_result) {
645 /* Result TLV */
646 wpa_printf(MSG_DEBUG,
647 "EAP-TEAP: Add Result TLV (status=SUCCESS)");
648 result = wpabuf_put(buf, sizeof(*result));
649 result->tlv_type = host_to_be16(TEAP_TLV_MANDATORY |
650 TEAP_TLV_RESULT);
651 result->length = host_to_be16(2);
652 result->status = host_to_be16(TEAP_STATUS_SUCCESS);
653 }
654
655 /* Crypto-Binding TLV */
656 cb = wpabuf_put(buf, sizeof(*cb));
657 cb->tlv_type = host_to_be16(TEAP_TLV_MANDATORY |
658 TEAP_TLV_CRYPTO_BINDING);
659 cb->length = host_to_be16(sizeof(*cb) - sizeof(struct teap_tlv_hdr));
660 cb->version = EAP_TEAP_VERSION;
661 cb->received_version = data->peer_version;
662 /* FIX: RFC 7170 is not clear on which Flags value to use when
663 * Crypto-Binding TLV is used with Basic-Password-Auth */
664 flags = data->cmk_emsk_available ?
665 TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC :
666 TEAP_CRYPTO_BINDING_MSK_CMAC;
667 subtype = TEAP_CRYPTO_BINDING_SUBTYPE_REQUEST;
668 cb->subtype = (flags << 4) | subtype;
669 if (random_get_bytes(cb->nonce, sizeof(cb->nonce)) < 0) {
670 wpabuf_free(buf);
671 return NULL;
672 }
673
674 /*
675 * RFC 7170, Section 4.2.13:
676 * The nonce in a request MUST have its least significant bit set to 0.
677 */
678 cb->nonce[sizeof(cb->nonce) - 1] &= ~0x01;
679
680 os_memcpy(data->crypto_binding_nonce, cb->nonce, sizeof(cb->nonce));
681
682 if (eap_teap_compound_mac(data->tls_cs, cb, data->server_outer_tlvs,
683 data->peer_outer_tlvs, data->cmk_msk,
684 cb->msk_compound_mac) < 0) {
685 wpabuf_free(buf);
686 return NULL;
687 }
688
689 if (data->cmk_emsk_available &&
690 eap_teap_compound_mac(data->tls_cs, cb, data->server_outer_tlvs,
691 data->peer_outer_tlvs, data->cmk_emsk,
692 cb->emsk_compound_mac) < 0) {
693 wpabuf_free(buf);
694 return NULL;
695 }
696
697 wpa_printf(MSG_DEBUG,
698 "EAP-TEAP: Add Crypto-Binding TLV: Version %u Received Version %u Flags %u Sub-Type %u",
699 cb->version, cb->received_version, flags, subtype);
700 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Nonce",
701 cb->nonce, sizeof(cb->nonce));
702 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: EMSK Compound MAC",
703 cb->emsk_compound_mac, sizeof(cb->emsk_compound_mac));
704 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: MSK Compound MAC",
705 cb->msk_compound_mac, sizeof(cb->msk_compound_mac));
706
707 return buf;
708 }
709
710
eap_teap_build_pac(struct eap_sm * sm,struct eap_teap_data * data)711 static struct wpabuf * eap_teap_build_pac(struct eap_sm *sm,
712 struct eap_teap_data *data)
713 {
714 u8 pac_key[EAP_TEAP_PAC_KEY_LEN];
715 u8 *pac_buf, *pac_opaque;
716 struct wpabuf *buf;
717 u8 *pos;
718 size_t buf_len, srv_id_info_len, pac_len;
719 struct teap_tlv_hdr *pac_tlv;
720 struct pac_attr_hdr *pac_info;
721 struct teap_tlv_result *result;
722 struct os_time now;
723
724 wpa_printf(MSG_DEBUG, "EAP-TEAP: Build a new PAC");
725
726 if (random_get_bytes(pac_key, EAP_TEAP_PAC_KEY_LEN) < 0 ||
727 os_get_time(&now) < 0)
728 return NULL;
729 wpa_hexdump_key(MSG_DEBUG, "EAP-TEAP: Generated PAC-Key",
730 pac_key, EAP_TEAP_PAC_KEY_LEN);
731
732 pac_len = (2 + EAP_TEAP_PAC_KEY_LEN) + (2 + 4) +
733 (2 + sm->identity_len) + 8;
734 pac_buf = os_malloc(pac_len);
735 if (!pac_buf)
736 return NULL;
737
738 srv_id_info_len = os_strlen(data->srv_id_info);
739
740 pos = pac_buf;
741 *pos++ = PAC_OPAQUE_TYPE_KEY;
742 *pos++ = EAP_TEAP_PAC_KEY_LEN;
743 os_memcpy(pos, pac_key, EAP_TEAP_PAC_KEY_LEN);
744 pos += EAP_TEAP_PAC_KEY_LEN;
745
746 wpa_printf(MSG_DEBUG, "EAP-TEAP: PAC-Key lifetime: %u seconds",
747 data->pac_key_lifetime);
748 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
749 *pos++ = 4;
750 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
751 pos += 4;
752
753 if (sm->identity) {
754 wpa_hexdump_ascii(MSG_DEBUG, "EAP-TEAP: PAC-Opaque Identity",
755 sm->identity, sm->identity_len);
756 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
757 *pos++ = sm->identity_len;
758 os_memcpy(pos, sm->identity, sm->identity_len);
759 pos += sm->identity_len;
760 }
761
762 pac_len = pos - pac_buf;
763 while (pac_len % 8) {
764 *pos++ = PAC_OPAQUE_TYPE_PAD;
765 pac_len++;
766 }
767
768 pac_opaque = os_malloc(pac_len + 8);
769 if (!pac_opaque) {
770 os_free(pac_buf);
771 return NULL;
772 }
773 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
774 pac_len / 8, pac_buf, pac_opaque) < 0) {
775 os_free(pac_buf);
776 os_free(pac_opaque);
777 return NULL;
778 }
779 os_free(pac_buf);
780
781 pac_len += 8;
782 wpa_hexdump(MSG_DEBUG, "EAP-TEAP: PAC-Opaque", pac_opaque, pac_len);
783
784 buf_len = sizeof(*pac_tlv) +
785 sizeof(struct pac_attr_hdr) + EAP_TEAP_PAC_KEY_LEN +
786 sizeof(struct pac_attr_hdr) + pac_len +
787 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
788 buf = wpabuf_alloc(buf_len);
789 if (!buf) {
790 os_free(pac_opaque);
791 return NULL;
792 }
793
794 /* Result TLV */
795 wpa_printf(MSG_DEBUG, "EAP-TEAP: Add Result TLV (status=SUCCESS)");
796 result = wpabuf_put(buf, sizeof(*result));
797 WPA_PUT_BE16((u8 *) &result->tlv_type,
798 TEAP_TLV_MANDATORY | TEAP_TLV_RESULT);
799 WPA_PUT_BE16((u8 *) &result->length, 2);
800 WPA_PUT_BE16((u8 *) &result->status, TEAP_STATUS_SUCCESS);
801
802 /* PAC TLV */
803 wpa_printf(MSG_DEBUG, "EAP-TEAP: Add PAC TLV");
804 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
805 pac_tlv->tlv_type = host_to_be16(TEAP_TLV_MANDATORY | TEAP_TLV_PAC);
806
807 /* PAC-Key */
808 eap_teap_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_TEAP_PAC_KEY_LEN);
809
810 /* PAC-Opaque */
811 eap_teap_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
812 os_free(pac_opaque);
813
814 /* PAC-Info */
815 pac_info = wpabuf_put(buf, sizeof(*pac_info));
816 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
817
818 /* PAC-Lifetime (inside PAC-Info) */
819 eap_teap_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
820 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
821
822 /* A-ID (inside PAC-Info) */
823 eap_teap_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
824
825 /* Note: headers may be misaligned after A-ID */
826
827 if (sm->identity) {
828 eap_teap_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
829 sm->identity_len);
830 }
831
832 /* A-ID-Info (inside PAC-Info) */
833 eap_teap_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
834 srv_id_info_len);
835
836 /* PAC-Type (inside PAC-Info) */
837 eap_teap_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
838 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
839
840 /* Update PAC-Info and PAC TLV Length fields */
841 pos = wpabuf_put(buf, 0);
842 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
843 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
844
845 return buf;
846 }
847
848
eap_teap_encrypt_phase2(struct eap_sm * sm,struct eap_teap_data * data,struct wpabuf * plain,int piggyback)849 static int eap_teap_encrypt_phase2(struct eap_sm *sm,
850 struct eap_teap_data *data,
851 struct wpabuf *plain, int piggyback)
852 {
853 struct wpabuf *encr;
854
855 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TEAP: Encrypting Phase 2 TLVs",
856 plain);
857 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
858 wpabuf_free(plain);
859
860 if (!encr)
861 return -1;
862
863 if (data->ssl.tls_out && piggyback) {
864 wpa_printf(MSG_DEBUG,
865 "EAP-TEAP: Piggyback Phase 2 data (len=%d) with last Phase 1 Message (len=%d used=%d)",
866 (int) wpabuf_len(encr),
867 (int) wpabuf_len(data->ssl.tls_out),
868 (int) data->ssl.tls_out_pos);
869 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
870 wpa_printf(MSG_WARNING,
871 "EAP-TEAP: Failed to resize output buffer");
872 wpabuf_free(encr);
873 return -1;
874 }
875 wpabuf_put_buf(data->ssl.tls_out, encr);
876 wpabuf_free(encr);
877 } else {
878 wpabuf_free(data->ssl.tls_out);
879 data->ssl.tls_out_pos = 0;
880 data->ssl.tls_out = encr;
881 }
882
883 return 0;
884 }
885
886
eap_teap_buildReq(struct eap_sm * sm,void * priv,u8 id)887 static struct wpabuf * eap_teap_buildReq(struct eap_sm *sm, void *priv, u8 id)
888 {
889 struct eap_teap_data *data = priv;
890 struct wpabuf *req = NULL;
891 int piggyback = 0;
892
893 if (data->ssl.state == FRAG_ACK) {
894 return eap_server_tls_build_ack(id, EAP_TYPE_TEAP,
895 data->teap_version);
896 }
897
898 if (data->ssl.state == WAIT_FRAG_ACK) {
899 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TEAP,
900 data->teap_version, id);
901 }
902
903 switch (data->state) {
904 case START:
905 return eap_teap_build_start(sm, data, id);
906 case PHASE1B:
907 if (tls_connection_established(sm->cfg->ssl_ctx,
908 data->ssl.conn)) {
909 if (eap_teap_phase1_done(sm, data) < 0)
910 return NULL;
911 if (data->state == PHASE2_START) {
912 int res;
913
914 /*
915 * Try to generate Phase 2 data to piggyback
916 * with the end of Phase 1 to avoid extra
917 * roundtrip.
918 */
919 wpa_printf(MSG_DEBUG,
920 "EAP-TEAP: Try to start Phase 2");
921 res = eap_teap_process_phase2_start(sm, data);
922 if (res == 1) {
923 req = eap_teap_build_crypto_binding(
924 sm, data);
925 piggyback = 1;
926 break;
927 }
928
929 if (res)
930 break;
931 req = eap_teap_build_phase2_req(sm, data, id);
932 piggyback = 1;
933 }
934 }
935 break;
936 case PHASE2_ID:
937 case PHASE2_BASIC_AUTH:
938 case PHASE2_METHOD:
939 req = eap_teap_build_phase2_req(sm, data, id);
940 break;
941 case CRYPTO_BINDING:
942 req = eap_teap_build_crypto_binding(sm, data);
943 if (data->phase2_method) {
944 /*
945 * Include the start of the next EAP method in the
946 * sequence in the same message with Crypto-Binding to
947 * save a round-trip.
948 */
949 struct wpabuf *eap;
950
951 eap = eap_teap_build_phase2_req(sm, data, id);
952 req = wpabuf_concat(req, eap);
953 eap_teap_state(data, PHASE2_METHOD);
954 }
955 break;
956 case REQUEST_PAC:
957 req = eap_teap_build_pac(sm, data);
958 break;
959 case FAILURE_SEND_RESULT:
960 req = eap_teap_tlv_result(TEAP_STATUS_FAILURE, 0);
961 if (data->error_code)
962 req = wpabuf_concat(
963 req, eap_teap_tlv_error(data->error_code));
964 break;
965 case SUCCESS_SEND_RESULT:
966 req = eap_teap_tlv_result(TEAP_STATUS_SUCCESS, 0);
967 data->final_result = 1;
968 break;
969 default:
970 wpa_printf(MSG_DEBUG, "EAP-TEAP: %s - unexpected state %d",
971 __func__, data->state);
972 return NULL;
973 }
974
975 if (req && eap_teap_encrypt_phase2(sm, data, req, piggyback) < 0)
976 return NULL;
977
978 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TEAP,
979 data->teap_version, id);
980 }
981
982
eap_teap_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)983 static bool eap_teap_check(struct eap_sm *sm, void *priv,
984 struct wpabuf *respData)
985 {
986 const u8 *pos;
987 size_t len;
988
989 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TEAP, respData, &len);
990 if (!pos || len < 1) {
991 wpa_printf(MSG_INFO, "EAP-TEAP: Invalid frame");
992 return true;
993 }
994
995 return false;
996 }
997
998
eap_teap_phase2_init(struct eap_sm * sm,struct eap_teap_data * data,int vendor,enum eap_type eap_type)999 static int eap_teap_phase2_init(struct eap_sm *sm, struct eap_teap_data *data,
1000 int vendor, enum eap_type eap_type)
1001 {
1002 if (data->phase2_priv && data->phase2_method) {
1003 data->phase2_method->reset(sm, data->phase2_priv);
1004 data->phase2_method = NULL;
1005 data->phase2_priv = NULL;
1006 }
1007 data->phase2_method = eap_server_get_eap_method(vendor, eap_type);
1008 if (!data->phase2_method)
1009 return -1;
1010
1011 sm->init_phase2 = 1;
1012 data->phase2_priv = data->phase2_method->init(sm);
1013 sm->init_phase2 = 0;
1014
1015 return data->phase2_priv ? 0 : -1;
1016 }
1017
1018
eap_teap_valid_id_type(struct eap_sm * sm,struct eap_teap_data * data,enum teap_identity_types id_type)1019 static int eap_teap_valid_id_type(struct eap_sm *sm, struct eap_teap_data *data,
1020 enum teap_identity_types id_type)
1021 {
1022 if (sm->cfg->eap_teap_id == EAP_TEAP_ID_REQUIRE_USER &&
1023 id_type != TEAP_IDENTITY_TYPE_USER)
1024 return 0;
1025 if (sm->cfg->eap_teap_id == EAP_TEAP_ID_REQUIRE_MACHINE &&
1026 id_type != TEAP_IDENTITY_TYPE_MACHINE)
1027 return 0;
1028 if (sm->cfg->eap_teap_id == EAP_TEAP_ID_REQUIRE_USER_AND_MACHINE &&
1029 id_type != data->cur_id_type)
1030 return 0;
1031 if (sm->cfg->eap_teap_id != EAP_TEAP_ID_ALLOW_ANY &&
1032 id_type != TEAP_IDENTITY_TYPE_USER &&
1033 id_type != TEAP_IDENTITY_TYPE_MACHINE)
1034 return 0;
1035 return 1;
1036 }
1037
1038
eap_teap_process_phase2_response(struct eap_sm * sm,struct eap_teap_data * data,u8 * in_data,size_t in_len,enum teap_identity_types id_type)1039 static void eap_teap_process_phase2_response(struct eap_sm *sm,
1040 struct eap_teap_data *data,
1041 u8 *in_data, size_t in_len,
1042 enum teap_identity_types id_type)
1043 {
1044 int next_vendor = EAP_VENDOR_IETF;
1045 enum eap_type next_type = EAP_TYPE_NONE;
1046 struct eap_hdr *hdr;
1047 u8 *pos;
1048 size_t left;
1049 struct wpabuf buf;
1050 const struct eap_method *m = data->phase2_method;
1051 void *priv = data->phase2_priv;
1052
1053 if (!priv) {
1054 wpa_printf(MSG_DEBUG,
1055 "EAP-TEAP: %s - Phase 2 not initialized?!",
1056 __func__);
1057 return;
1058 }
1059
1060 hdr = (struct eap_hdr *) in_data;
1061 pos = (u8 *) (hdr + 1);
1062
1063 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
1064 left = in_len - sizeof(*hdr);
1065 wpa_hexdump(MSG_DEBUG,
1066 "EAP-TEAP: Phase 2 type Nak'ed; allowed types",
1067 pos + 1, left - 1);
1068 #ifdef EAP_SERVER_TNC
1069 if (m && m->vendor == EAP_VENDOR_IETF &&
1070 m->method == EAP_TYPE_TNC) {
1071 wpa_printf(MSG_DEBUG,
1072 "EAP-TEAP: Peer Nak'ed required TNC negotiation");
1073 next_vendor = EAP_VENDOR_IETF;
1074 next_type = eap_teap_req_failure(data, 0);
1075 eap_teap_phase2_init(sm, data, next_vendor, next_type);
1076 return;
1077 }
1078 #endif /* EAP_SERVER_TNC */
1079 eap_sm_process_nak(sm, pos + 1, left - 1);
1080 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1081 sm->user->methods[sm->user_eap_method_index].method !=
1082 EAP_TYPE_NONE) {
1083 next_vendor = sm->user->methods[
1084 sm->user_eap_method_index].vendor;
1085 next_type = sm->user->methods[
1086 sm->user_eap_method_index++].method;
1087 wpa_printf(MSG_DEBUG, "EAP-TEAP: try EAP type %u:%u",
1088 next_vendor, next_type);
1089 } else {
1090 next_vendor = EAP_VENDOR_IETF;
1091 next_type = eap_teap_req_failure(data, 0);
1092 }
1093 eap_teap_phase2_init(sm, data, next_vendor, next_type);
1094 return;
1095 }
1096
1097 wpabuf_set(&buf, in_data, in_len);
1098
1099 if (m->check(sm, priv, &buf)) {
1100 wpa_printf(MSG_DEBUG,
1101 "EAP-TEAP: Phase 2 check() asked to ignore the packet");
1102 eap_teap_req_failure(data, TEAP_ERROR_INNER_METHOD);
1103 return;
1104 }
1105
1106 m->process(sm, priv, &buf);
1107
1108 if (!m->isDone(sm, priv))
1109 return;
1110
1111 if (!m->isSuccess(sm, priv)) {
1112 wpa_printf(MSG_DEBUG, "EAP-TEAP: Phase 2 method failed");
1113 next_vendor = EAP_VENDOR_IETF;
1114 next_type = eap_teap_req_failure(data, TEAP_ERROR_INNER_METHOD);
1115 eap_teap_phase2_init(sm, data, next_vendor, next_type);
1116 return;
1117 }
1118
1119 switch (data->state) {
1120 case PHASE2_ID:
1121 if (!eap_teap_valid_id_type(sm, data, id_type)) {
1122 wpa_printf(MSG_DEBUG,
1123 "EAP-TEAP: Provided Identity-Type %u not allowed",
1124 id_type);
1125 eap_teap_req_failure(data, TEAP_ERROR_INNER_METHOD);
1126 break;
1127 }
1128 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1129 wpa_hexdump_ascii(MSG_DEBUG,
1130 "EAP-TEAP: Phase 2 Identity not found in the user database",
1131 sm->identity, sm->identity_len);
1132 next_vendor = EAP_VENDOR_IETF;
1133 next_type = eap_teap_req_failure(
1134 data, TEAP_ERROR_INNER_METHOD);
1135 break;
1136 }
1137
1138 eap_teap_state(data, PHASE2_METHOD);
1139 if (data->anon_provisioning) {
1140 /* TODO: Allow any inner EAP method that provides
1141 * mutual authentication and EMSK derivation (i.e.,
1142 * EAP-pwd or EAP-EKE). */
1143 next_vendor = EAP_VENDOR_IETF;
1144 next_type = EAP_TYPE_PWD;
1145 sm->user_eap_method_index = 0;
1146 } else {
1147 next_vendor = sm->user->methods[0].vendor;
1148 next_type = sm->user->methods[0].method;
1149 sm->user_eap_method_index = 1;
1150 }
1151 wpa_printf(MSG_DEBUG, "EAP-TEAP: Try EAP type %u:%u",
1152 next_vendor, next_type);
1153 break;
1154 case PHASE2_METHOD:
1155 case CRYPTO_BINDING:
1156 eap_teap_update_icmk(sm, data);
1157 if (data->state == PHASE2_METHOD &&
1158 (sm->cfg->eap_teap_id !=
1159 EAP_TEAP_ID_REQUIRE_USER_AND_MACHINE ||
1160 data->cur_id_type == TEAP_IDENTITY_TYPE_MACHINE))
1161 data->inner_eap_not_done = 0;
1162 eap_teap_state(data, CRYPTO_BINDING);
1163 data->eap_seq++;
1164 next_vendor = EAP_VENDOR_IETF;
1165 next_type = EAP_TYPE_NONE;
1166 #ifdef EAP_SERVER_TNC
1167 if (sm->cfg->tnc && !data->tnc_started) {
1168 wpa_printf(MSG_DEBUG, "EAP-TEAP: Initialize TNC");
1169 next_vendor = EAP_VENDOR_IETF;
1170 next_type = EAP_TYPE_TNC;
1171 data->tnc_started = 1;
1172 }
1173 #endif /* EAP_SERVER_TNC */
1174 break;
1175 case FAILURE:
1176 break;
1177 default:
1178 wpa_printf(MSG_DEBUG, "EAP-TEAP: %s - unexpected state %d",
1179 __func__, data->state);
1180 break;
1181 }
1182
1183 eap_teap_phase2_init(sm, data, next_vendor, next_type);
1184 }
1185
1186
eap_teap_process_phase2_eap(struct eap_sm * sm,struct eap_teap_data * data,u8 * in_data,size_t in_len,enum teap_identity_types id_type)1187 static void eap_teap_process_phase2_eap(struct eap_sm *sm,
1188 struct eap_teap_data *data,
1189 u8 *in_data, size_t in_len,
1190 enum teap_identity_types id_type)
1191 {
1192 struct eap_hdr *hdr;
1193 size_t len;
1194
1195 hdr = (struct eap_hdr *) in_data;
1196 if (in_len < (int) sizeof(*hdr)) {
1197 wpa_printf(MSG_INFO,
1198 "EAP-TEAP: Too short Phase 2 EAP frame (len=%lu)",
1199 (unsigned long) in_len);
1200 eap_teap_req_failure(data, TEAP_ERROR_INNER_METHOD);
1201 return;
1202 }
1203 len = be_to_host16(hdr->length);
1204 if (len > in_len) {
1205 wpa_printf(MSG_INFO,
1206 "EAP-TEAP: Length mismatch in Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1207 (unsigned long) in_len, (unsigned long) len);
1208 eap_teap_req_failure(data, TEAP_ERROR_INNER_METHOD);
1209 return;
1210 }
1211 wpa_printf(MSG_DEBUG,
1212 "EAP-TEAP: Received Phase 2: code=%d identifier=%d length=%lu",
1213 hdr->code, hdr->identifier,
1214 (unsigned long) len);
1215 switch (hdr->code) {
1216 case EAP_CODE_RESPONSE:
1217 eap_teap_process_phase2_response(sm, data, (u8 *) hdr, len,
1218 id_type);
1219 break;
1220 default:
1221 wpa_printf(MSG_INFO,
1222 "EAP-TEAP: Unexpected code=%d in Phase 2 EAP header",
1223 hdr->code);
1224 break;
1225 }
1226 }
1227
1228
eap_teap_process_basic_auth_resp(struct eap_sm * sm,struct eap_teap_data * data,u8 * in_data,size_t in_len,enum teap_identity_types id_type)1229 static void eap_teap_process_basic_auth_resp(struct eap_sm *sm,
1230 struct eap_teap_data *data,
1231 u8 *in_data, size_t in_len,
1232 enum teap_identity_types id_type)
1233 {
1234 u8 *pos, *end, *username, *password, *new_id;
1235 u8 userlen, passlen;
1236
1237 if (!eap_teap_valid_id_type(sm, data, id_type)) {
1238 wpa_printf(MSG_DEBUG,
1239 "EAP-TEAP: Provided Identity-Type %u not allowed",
1240 id_type);
1241 eap_teap_req_failure(data, 0);
1242 return;
1243 }
1244
1245 pos = in_data;
1246 end = pos + in_len;
1247
1248 if (end - pos < 1) {
1249 wpa_printf(MSG_DEBUG,
1250 "EAP-TEAP: No room for Basic-Password-Auth-Resp Userlen field");
1251 eap_teap_req_failure(data, 0);
1252 return;
1253 }
1254 userlen = *pos++;
1255 if (end - pos < userlen) {
1256 wpa_printf(MSG_DEBUG,
1257 "EAP-TEAP: Truncated Basic-Password-Auth-Resp Username field");
1258 eap_teap_req_failure(data, 0);
1259 return;
1260 }
1261 username = pos;
1262 pos += userlen;
1263 wpa_hexdump_ascii(MSG_DEBUG,
1264 "EAP-TEAP: Basic-Password-Auth-Resp Username",
1265 username, userlen);
1266
1267 if (end - pos < 1) {
1268 wpa_printf(MSG_DEBUG,
1269 "EAP-TEAP: No room for Basic-Password-Auth-Resp Passlen field");
1270 eap_teap_req_failure(data, 0);
1271 return;
1272 }
1273 passlen = *pos++;
1274 if (end - pos < passlen) {
1275 wpa_printf(MSG_DEBUG,
1276 "EAP-TEAP: Truncated Basic-Password-Auth-Resp Password field");
1277 eap_teap_req_failure(data, 0);
1278 return;
1279 }
1280 password = pos;
1281 pos += passlen;
1282 wpa_hexdump_ascii_key(MSG_DEBUG,
1283 "EAP-TEAP: Basic-Password-Auth-Resp Password",
1284 password, passlen);
1285
1286 if (end > pos) {
1287 wpa_printf(MSG_DEBUG,
1288 "EAP-TEAP: Unexpected %d extra octet(s) at the end of Basic-Password-Auth-Resp TLV",
1289 (int) (end - pos));
1290 eap_teap_req_failure(data, 0);
1291 return;
1292 }
1293
1294 if (eap_user_get(sm, username, userlen, 1) != 0) {
1295 wpa_printf(MSG_DEBUG,
1296 "EAP-TEAP: Username not found in the user database");
1297 eap_teap_req_failure(data, 0);
1298 return;
1299 }
1300
1301 if (!sm->user || !sm->user->password || sm->user->password_hash) {
1302 wpa_printf(MSG_DEBUG,
1303 "EAP-TEAP: No plaintext user password configured");
1304 eap_teap_req_failure(data, 0);
1305 return;
1306 }
1307
1308 if (sm->user->password_len != passlen ||
1309 os_memcmp_const(sm->user->password, password, passlen) != 0) {
1310 wpa_printf(MSG_DEBUG, "EAP-TEAP: Invalid password");
1311 eap_teap_req_failure(data, 0);
1312 return;
1313 }
1314
1315 wpa_printf(MSG_DEBUG, "EAP-TEAP: Correct password");
1316 new_id = os_memdup(username, userlen);
1317 if (new_id) {
1318 os_free(sm->identity);
1319 sm->identity = new_id;
1320 sm->identity_len = userlen;
1321 }
1322 if (sm->cfg->eap_teap_id != EAP_TEAP_ID_REQUIRE_USER_AND_MACHINE ||
1323 data->cur_id_type == TEAP_IDENTITY_TYPE_MACHINE)
1324 data->basic_auth_not_done = 0;
1325 eap_teap_state(data, CRYPTO_BINDING);
1326 eap_teap_update_icmk(sm, data);
1327 }
1328
1329
eap_teap_parse_tlvs(struct wpabuf * data,struct eap_teap_tlv_parse * tlv)1330 static int eap_teap_parse_tlvs(struct wpabuf *data,
1331 struct eap_teap_tlv_parse *tlv)
1332 {
1333 u16 tlv_type;
1334 int mandatory, res;
1335 size_t len;
1336 u8 *pos, *end;
1337
1338 os_memset(tlv, 0, sizeof(*tlv));
1339
1340 pos = wpabuf_mhead(data);
1341 end = pos + wpabuf_len(data);
1342 while (end - pos > 4) {
1343 mandatory = pos[0] & 0x80;
1344 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1345 pos += 2;
1346 len = WPA_GET_BE16(pos);
1347 pos += 2;
1348 if (len > (size_t) (end - pos)) {
1349 wpa_printf(MSG_INFO, "EAP-TEAP: TLV overflow");
1350 return -1;
1351 }
1352 wpa_printf(MSG_DEBUG,
1353 "EAP-TEAP: Received Phase 2: TLV type %u (%s) length %u%s",
1354 tlv_type, eap_teap_tlv_type_str(tlv_type),
1355 (unsigned int) len,
1356 mandatory ? " (mandatory)" : "");
1357
1358 res = eap_teap_parse_tlv(tlv, tlv_type, pos, len);
1359 if (res == -2)
1360 break;
1361 if (res < 0) {
1362 if (mandatory) {
1363 wpa_printf(MSG_DEBUG,
1364 "EAP-TEAP: NAK unknown mandatory TLV type %u",
1365 tlv_type);
1366 /* TODO: generate NAK TLV */
1367 break;
1368 }
1369
1370 wpa_printf(MSG_DEBUG,
1371 "EAP-TEAP: Ignore unknown optional TLV type %u",
1372 tlv_type);
1373 }
1374
1375 pos += len;
1376 }
1377
1378 return 0;
1379 }
1380
1381
eap_teap_validate_crypto_binding(struct eap_teap_data * data,const struct teap_tlv_crypto_binding * cb,size_t bind_len)1382 static int eap_teap_validate_crypto_binding(
1383 struct eap_teap_data *data, const struct teap_tlv_crypto_binding *cb,
1384 size_t bind_len)
1385 {
1386 u8 flags, subtype;
1387
1388 subtype = cb->subtype & 0x0f;
1389 flags = cb->subtype >> 4;
1390
1391 wpa_printf(MSG_DEBUG,
1392 "EAP-TEAP: Reply Crypto-Binding TLV: Version %u Received Version %u Flags %u Sub-Type %u",
1393 cb->version, cb->received_version, flags, subtype);
1394 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Nonce",
1395 cb->nonce, sizeof(cb->nonce));
1396 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: EMSK Compound MAC",
1397 cb->emsk_compound_mac, sizeof(cb->emsk_compound_mac));
1398 wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: MSK Compound MAC",
1399 cb->msk_compound_mac, sizeof(cb->msk_compound_mac));
1400
1401 if (cb->version != EAP_TEAP_VERSION ||
1402 cb->received_version != data->peer_version) {
1403 wpa_printf(MSG_DEBUG,
1404 "EAP-TEAP: Unexpected version in Crypto-Binding: Version %u Received Version %u",
1405 cb->version, cb->received_version);
1406 return -1;
1407 }
1408
1409 if (flags < 1 || flags > 3) {
1410 wpa_printf(MSG_DEBUG,
1411 "EAP-TEAP: Unexpected Flags in Crypto-Binding: %u",
1412 flags);
1413 return -1;
1414 }
1415
1416 if (subtype != TEAP_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1417 wpa_printf(MSG_DEBUG,
1418 "EAP-TEAP: Unexpected Sub-Type in Crypto-Binding: %u",
1419 subtype);
1420 return -1;
1421 }
1422
1423 if (os_memcmp_const(data->crypto_binding_nonce, cb->nonce,
1424 EAP_TEAP_NONCE_LEN - 1) != 0 ||
1425 (data->crypto_binding_nonce[EAP_TEAP_NONCE_LEN - 1] | 1) !=
1426 cb->nonce[EAP_TEAP_NONCE_LEN - 1]) {
1427 wpa_printf(MSG_DEBUG,
1428 "EAP-TEAP: Invalid Nonce in Crypto-Binding");
1429 return -1;
1430 }
1431
1432 if (flags == TEAP_CRYPTO_BINDING_MSK_CMAC ||
1433 flags == TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC) {
1434 u8 msk_compound_mac[EAP_TEAP_COMPOUND_MAC_LEN];
1435
1436 if (eap_teap_compound_mac(data->tls_cs, cb,
1437 data->server_outer_tlvs,
1438 data->peer_outer_tlvs, data->cmk_msk,
1439 msk_compound_mac) < 0)
1440 return -1;
1441 if (os_memcmp_const(msk_compound_mac, cb->msk_compound_mac,
1442 EAP_TEAP_COMPOUND_MAC_LEN) != 0) {
1443 wpa_hexdump(MSG_DEBUG,
1444 "EAP-TEAP: Calculated MSK Compound MAC",
1445 msk_compound_mac,
1446 EAP_TEAP_COMPOUND_MAC_LEN);
1447 wpa_printf(MSG_INFO,
1448 "EAP-TEAP: MSK Compound MAC did not match");
1449 return -1;
1450 }
1451 }
1452
1453 if ((flags == TEAP_CRYPTO_BINDING_EMSK_CMAC ||
1454 flags == TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC) &&
1455 data->cmk_emsk_available) {
1456 u8 emsk_compound_mac[EAP_TEAP_COMPOUND_MAC_LEN];
1457
1458 if (eap_teap_compound_mac(data->tls_cs, cb,
1459 data->server_outer_tlvs,
1460 data->peer_outer_tlvs, data->cmk_emsk,
1461 emsk_compound_mac) < 0)
1462 return -1;
1463 if (os_memcmp_const(emsk_compound_mac, cb->emsk_compound_mac,
1464 EAP_TEAP_COMPOUND_MAC_LEN) != 0) {
1465 wpa_hexdump(MSG_DEBUG,
1466 "EAP-TEAP: Calculated EMSK Compound MAC",
1467 emsk_compound_mac,
1468 EAP_TEAP_COMPOUND_MAC_LEN);
1469 wpa_printf(MSG_INFO,
1470 "EAP-TEAP: EMSK Compound MAC did not match");
1471 return -1;
1472 }
1473 }
1474
1475 if (flags == TEAP_CRYPTO_BINDING_EMSK_CMAC &&
1476 !data->cmk_emsk_available) {
1477 wpa_printf(MSG_INFO,
1478 "EAP-TEAP: Peer included only EMSK Compound MAC, but no locally generated inner EAP EMSK to validate this");
1479 return -1;
1480 }
1481
1482 return 0;
1483 }
1484
1485
eap_teap_pac_type(u8 * pac,size_t len,u16 type)1486 static int eap_teap_pac_type(u8 *pac, size_t len, u16 type)
1487 {
1488 struct teap_attr_pac_type *tlv;
1489
1490 if (!pac || len != sizeof(*tlv))
1491 return 0;
1492
1493 tlv = (struct teap_attr_pac_type *) pac;
1494
1495 return be_to_host16(tlv->type) == PAC_TYPE_PAC_TYPE &&
1496 be_to_host16(tlv->length) == 2 &&
1497 be_to_host16(tlv->pac_type) == type;
1498 }
1499
1500
eap_teap_process_phase2_tlvs(struct eap_sm * sm,struct eap_teap_data * data,struct wpabuf * in_data)1501 static void eap_teap_process_phase2_tlvs(struct eap_sm *sm,
1502 struct eap_teap_data *data,
1503 struct wpabuf *in_data)
1504 {
1505 struct eap_teap_tlv_parse tlv;
1506 int check_crypto_binding = data->state == CRYPTO_BINDING;
1507
1508 if (eap_teap_parse_tlvs(in_data, &tlv) < 0) {
1509 wpa_printf(MSG_DEBUG,
1510 "EAP-TEAP: Failed to parse received Phase 2 TLVs");
1511 return;
1512 }
1513
1514 if (tlv.result == TEAP_STATUS_FAILURE) {
1515 wpa_printf(MSG_DEBUG, "EAP-TEAP: Result TLV indicated failure");
1516 eap_teap_state(data, FAILURE);
1517 return;
1518 }
1519
1520 if (tlv.nak) {
1521 wpa_printf(MSG_DEBUG,
1522 "EAP-TEAP: Peer NAK'ed Vendor-Id %u NAK-Type %u",
1523 WPA_GET_BE32(tlv.nak), WPA_GET_BE16(tlv.nak + 4));
1524 eap_teap_state(data, FAILURE_SEND_RESULT);
1525 return;
1526 }
1527
1528 if (data->state == REQUEST_PAC) {
1529 u16 type, len, res;
1530
1531 if (!tlv.pac || tlv.pac_len < 6) {
1532 wpa_printf(MSG_DEBUG,
1533 "EAP-TEAP: No PAC Acknowledgement received");
1534 eap_teap_state(data, FAILURE);
1535 return;
1536 }
1537
1538 type = WPA_GET_BE16(tlv.pac);
1539 len = WPA_GET_BE16(tlv.pac + 2);
1540 res = WPA_GET_BE16(tlv.pac + 4);
1541
1542 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1543 res != TEAP_STATUS_SUCCESS) {
1544 wpa_printf(MSG_DEBUG,
1545 "EAP-TEAP: PAC TLV did not contain acknowledgement");
1546 eap_teap_state(data, FAILURE);
1547 return;
1548 }
1549
1550 wpa_printf(MSG_DEBUG,
1551 "EAP-TEAP: PAC-Acknowledgement received - PAC provisioning succeeded");
1552 eap_teap_state(data, SUCCESS);
1553 return;
1554 }
1555
1556 if (check_crypto_binding) {
1557 if (!tlv.crypto_binding) {
1558 wpa_printf(MSG_DEBUG,
1559 "EAP-TEAP: No Crypto-Binding TLV received");
1560 eap_teap_state(data, FAILURE);
1561 return;
1562 }
1563
1564 if (data->final_result &&
1565 tlv.result != TEAP_STATUS_SUCCESS) {
1566 wpa_printf(MSG_DEBUG,
1567 "EAP-TEAP: Crypto-Binding TLV without Success Result");
1568 eap_teap_state(data, FAILURE);
1569 return;
1570 }
1571
1572 if (sm->cfg->eap_teap_auth != 1 &&
1573 !data->skipped_inner_auth &&
1574 tlv.iresult != TEAP_STATUS_SUCCESS) {
1575 wpa_printf(MSG_DEBUG,
1576 "EAP-TEAP: Crypto-Binding TLV without intermediate Success Result");
1577 eap_teap_state(data, FAILURE);
1578 return;
1579 }
1580
1581 if (eap_teap_validate_crypto_binding(data, tlv.crypto_binding,
1582 tlv.crypto_binding_len)) {
1583 eap_teap_state(data, FAILURE);
1584 return;
1585 }
1586
1587 wpa_printf(MSG_DEBUG,
1588 "EAP-TEAP: Valid Crypto-Binding TLV received");
1589 if (data->final_result) {
1590 wpa_printf(MSG_DEBUG,
1591 "EAP-TEAP: Authentication completed successfully");
1592 }
1593
1594 if (data->anon_provisioning &&
1595 sm->cfg->eap_fast_prov != ANON_PROV &&
1596 sm->cfg->eap_fast_prov != BOTH_PROV) {
1597 wpa_printf(MSG_DEBUG,
1598 "EAP-TEAP: Client is trying to use unauthenticated provisioning which is disabled");
1599 eap_teap_state(data, FAILURE);
1600 return;
1601 }
1602
1603 if (sm->cfg->eap_fast_prov != AUTH_PROV &&
1604 sm->cfg->eap_fast_prov != BOTH_PROV &&
1605 tlv.request_action == TEAP_REQUEST_ACTION_PROCESS_TLV &&
1606 eap_teap_pac_type(tlv.pac, tlv.pac_len,
1607 PAC_TYPE_TUNNEL_PAC)) {
1608 wpa_printf(MSG_DEBUG,
1609 "EAP-TEAP: Client is trying to use authenticated provisioning which is disabled");
1610 eap_teap_state(data, FAILURE);
1611 return;
1612 }
1613
1614 if (data->anon_provisioning ||
1615 (tlv.request_action == TEAP_REQUEST_ACTION_PROCESS_TLV &&
1616 eap_teap_pac_type(tlv.pac, tlv.pac_len,
1617 PAC_TYPE_TUNNEL_PAC))) {
1618 wpa_printf(MSG_DEBUG,
1619 "EAP-TEAP: Requested a new Tunnel PAC");
1620 eap_teap_state(data, REQUEST_PAC);
1621 } else if (data->send_new_pac) {
1622 wpa_printf(MSG_DEBUG,
1623 "EAP-TEAP: Server triggered re-keying of Tunnel PAC");
1624 eap_teap_state(data, REQUEST_PAC);
1625 } else if (data->final_result) {
1626 eap_teap_state(data, SUCCESS);
1627 } else if (sm->cfg->eap_teap_separate_result) {
1628 eap_teap_state(data, SUCCESS_SEND_RESULT);
1629 }
1630 }
1631
1632 if (tlv.basic_auth_resp) {
1633 if (sm->cfg->eap_teap_auth != 1) {
1634 wpa_printf(MSG_DEBUG,
1635 "EAP-TEAP: Unexpected Basic-Password-Auth-Resp when trying to use inner EAP");
1636 eap_teap_state(data, FAILURE);
1637 return;
1638 }
1639 eap_teap_process_basic_auth_resp(sm, data, tlv.basic_auth_resp,
1640 tlv.basic_auth_resp_len,
1641 tlv.identity_type);
1642 }
1643
1644 if (tlv.eap_payload_tlv) {
1645 if (sm->cfg->eap_teap_auth == 1) {
1646 wpa_printf(MSG_DEBUG,
1647 "EAP-TEAP: Unexpected EAP Payload TLV when trying to use Basic-Password-Auth");
1648 eap_teap_state(data, FAILURE);
1649 return;
1650 }
1651 eap_teap_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1652 tlv.eap_payload_tlv_len,
1653 tlv.identity_type);
1654 }
1655
1656 if (data->state == SUCCESS_SEND_RESULT &&
1657 tlv.result == TEAP_STATUS_SUCCESS) {
1658 wpa_printf(MSG_DEBUG,
1659 "EAP-TEAP: Peer agreed with final success - authentication completed");
1660 eap_teap_state(data, SUCCESS);
1661 } else if (check_crypto_binding && data->state == CRYPTO_BINDING &&
1662 sm->cfg->eap_teap_auth == 1 && data->basic_auth_not_done) {
1663 wpa_printf(MSG_DEBUG,
1664 "EAP-TEAP: Continue with basic password authentication for second credential");
1665 eap_teap_state(data, PHASE2_BASIC_AUTH);
1666 } else if (check_crypto_binding && data->state == CRYPTO_BINDING &&
1667 sm->cfg->eap_teap_auth == 0 && data->inner_eap_not_done) {
1668 wpa_printf(MSG_DEBUG,
1669 "EAP-TEAP: Continue with inner EAP authentication for second credential");
1670 eap_teap_state(data, PHASE2_ID);
1671 if (eap_teap_phase2_init(sm, data, EAP_VENDOR_IETF,
1672 EAP_TYPE_IDENTITY) < 0)
1673 eap_teap_state(data, FAILURE);
1674 }
1675 }
1676
1677
eap_teap_process_phase2(struct eap_sm * sm,struct eap_teap_data * data,struct wpabuf * in_buf)1678 static void eap_teap_process_phase2(struct eap_sm *sm,
1679 struct eap_teap_data *data,
1680 struct wpabuf *in_buf)
1681 {
1682 struct wpabuf *in_decrypted;
1683
1684 wpa_printf(MSG_DEBUG,
1685 "EAP-TEAP: Received %lu bytes encrypted data for Phase 2",
1686 (unsigned long) wpabuf_len(in_buf));
1687
1688 if (data->pending_phase2_resp) {
1689 wpa_printf(MSG_DEBUG,
1690 "EAP-TEAP: Pending Phase 2 response - skip decryption and use old data");
1691 eap_teap_process_phase2_tlvs(sm, data,
1692 data->pending_phase2_resp);
1693 wpabuf_free(data->pending_phase2_resp);
1694 data->pending_phase2_resp = NULL;
1695 return;
1696 }
1697
1698 in_decrypted = tls_connection_decrypt(sm->cfg->ssl_ctx, data->ssl.conn,
1699 in_buf);
1700 if (!in_decrypted) {
1701 wpa_printf(MSG_INFO,
1702 "EAP-TEAP: Failed to decrypt Phase 2 data");
1703 eap_teap_state(data, FAILURE);
1704 return;
1705 }
1706
1707 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TEAP: Decrypted Phase 2 TLVs",
1708 in_decrypted);
1709
1710 eap_teap_process_phase2_tlvs(sm, data, in_decrypted);
1711
1712 if (sm->method_pending == METHOD_PENDING_WAIT) {
1713 wpa_printf(MSG_DEBUG,
1714 "EAP-TEAP: Phase 2 method is in pending wait state - save decrypted response");
1715 wpabuf_free(data->pending_phase2_resp);
1716 data->pending_phase2_resp = in_decrypted;
1717 return;
1718 }
1719
1720 wpabuf_free(in_decrypted);
1721 }
1722
1723
eap_teap_process_version(struct eap_sm * sm,void * priv,int peer_version)1724 static int eap_teap_process_version(struct eap_sm *sm, void *priv,
1725 int peer_version)
1726 {
1727 struct eap_teap_data *data = priv;
1728
1729 if (peer_version < 1) {
1730 /* Version 1 was the first defined version, so reject 0 */
1731 wpa_printf(MSG_INFO,
1732 "EAP-TEAP: Peer used unknown TEAP version %u",
1733 peer_version);
1734 return -1;
1735 }
1736
1737 if (peer_version < data->teap_version) {
1738 wpa_printf(MSG_DEBUG, "EAP-TEAP: peer ver=%u, own ver=%u; "
1739 "use version %u",
1740 peer_version, data->teap_version, peer_version);
1741 data->teap_version = peer_version;
1742 }
1743
1744 data->peer_version = peer_version;
1745
1746 return 0;
1747 }
1748
1749
eap_teap_process_phase1(struct eap_sm * sm,struct eap_teap_data * data)1750 static int eap_teap_process_phase1(struct eap_sm *sm,
1751 struct eap_teap_data *data)
1752 {
1753 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1754 wpa_printf(MSG_INFO, "EAP-TEAP: TLS processing failed");
1755 eap_teap_state(data, FAILURE);
1756 return -1;
1757 }
1758
1759 if (!tls_connection_established(sm->cfg->ssl_ctx, data->ssl.conn) ||
1760 wpabuf_len(data->ssl.tls_out) > 0)
1761 return 1;
1762
1763 /*
1764 * Phase 1 was completed with the received message (e.g., when using
1765 * abbreviated handshake), so Phase 2 can be started immediately
1766 * without having to send through an empty message to the peer.
1767 */
1768
1769 return eap_teap_phase1_done(sm, data);
1770 }
1771
1772
eap_teap_process_phase2_start(struct eap_sm * sm,struct eap_teap_data * data)1773 static int eap_teap_process_phase2_start(struct eap_sm *sm,
1774 struct eap_teap_data *data)
1775 {
1776 int next_vendor;
1777 enum eap_type next_type;
1778
1779 if (data->identity) {
1780 /* Used PAC and identity is from PAC-Opaque */
1781 os_free(sm->identity);
1782 sm->identity = data->identity;
1783 data->identity = NULL;
1784 sm->identity_len = data->identity_len;
1785 data->identity_len = 0;
1786 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1787 wpa_hexdump_ascii(MSG_DEBUG,
1788 "EAP-TEAP: Phase 2 Identity not found in the user database",
1789 sm->identity, sm->identity_len);
1790 next_vendor = EAP_VENDOR_IETF;
1791 next_type = EAP_TYPE_NONE;
1792 eap_teap_state(data, PHASE2_METHOD);
1793 } else if (sm->cfg->eap_teap_pac_no_inner ||
1794 sm->cfg->eap_teap_auth == 2) {
1795 wpa_printf(MSG_DEBUG,
1796 "EAP-TEAP: Used PAC or client certificate and identity already known - skip inner auth");
1797 data->skipped_inner_auth = 1;
1798 /* FIX: Need to derive CMK here. However, how is that
1799 * supposed to be done? RFC 7170 does not tell that for
1800 * the no-inner-auth case. */
1801 eap_teap_derive_cmk_basic_pw_auth(data->tls_cs,
1802 data->simck_msk,
1803 data->cmk_msk);
1804 eap_teap_state(data, CRYPTO_BINDING);
1805 return 1;
1806 } else if (sm->cfg->eap_teap_auth == 1) {
1807 eap_teap_state(data, PHASE2_BASIC_AUTH);
1808 return 1;
1809 } else {
1810 wpa_printf(MSG_DEBUG,
1811 "EAP-TEAP: Identity already known - skip Phase 2 Identity Request");
1812 next_vendor = sm->user->methods[0].vendor;
1813 next_type = sm->user->methods[0].method;
1814 sm->user_eap_method_index = 1;
1815 eap_teap_state(data, PHASE2_METHOD);
1816 }
1817
1818 } else if (sm->cfg->eap_teap_auth == 1) {
1819 eap_teap_state(data, PHASE2_BASIC_AUTH);
1820 return 0;
1821 } else {
1822 eap_teap_state(data, PHASE2_ID);
1823 next_vendor = EAP_VENDOR_IETF;
1824 next_type = EAP_TYPE_IDENTITY;
1825 }
1826
1827 return eap_teap_phase2_init(sm, data, next_vendor, next_type);
1828 }
1829
1830
eap_teap_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1831 static void eap_teap_process_msg(struct eap_sm *sm, void *priv,
1832 const struct wpabuf *respData)
1833 {
1834 struct eap_teap_data *data = priv;
1835
1836 switch (data->state) {
1837 case PHASE1:
1838 case PHASE1B:
1839 if (eap_teap_process_phase1(sm, data))
1840 break;
1841
1842 /* fall through */
1843 case PHASE2_START:
1844 eap_teap_process_phase2_start(sm, data);
1845 break;
1846 case PHASE2_ID:
1847 case PHASE2_BASIC_AUTH:
1848 case PHASE2_METHOD:
1849 case CRYPTO_BINDING:
1850 case REQUEST_PAC:
1851 case SUCCESS_SEND_RESULT:
1852 eap_teap_process_phase2(sm, data, data->ssl.tls_in);
1853 break;
1854 case FAILURE_SEND_RESULT:
1855 /* Protected failure result indication completed. Ignore the
1856 * received message (which is supposed to include Result TLV
1857 * indicating failure) and terminate exchange with cleartext
1858 * EAP-Failure. */
1859 eap_teap_state(data, FAILURE);
1860 break;
1861 default:
1862 wpa_printf(MSG_DEBUG, "EAP-TEAP: Unexpected state %d in %s",
1863 data->state, __func__);
1864 break;
1865 }
1866 }
1867
1868
eap_teap_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1869 static void eap_teap_process(struct eap_sm *sm, void *priv,
1870 struct wpabuf *respData)
1871 {
1872 struct eap_teap_data *data = priv;
1873 const u8 *pos;
1874 size_t len;
1875 struct wpabuf *resp = respData;
1876 u8 flags;
1877
1878 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TEAP, respData, &len);
1879 if (!pos || len < 1)
1880 return;
1881
1882 flags = *pos++;
1883 len--;
1884
1885 if (flags & EAP_TEAP_FLAGS_OUTER_TLV_LEN) {
1886 /* Extract Outer TLVs from the message before common TLS
1887 * processing */
1888 u32 message_len = 0, outer_tlv_len;
1889 const u8 *hdr;
1890
1891 if (data->state != PHASE1) {
1892 wpa_printf(MSG_INFO,
1893 "EAP-TEAP: Unexpected Outer TLVs in a message that is not the first message from the peer");
1894 return;
1895 }
1896
1897 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
1898 if (len < 4) {
1899 wpa_printf(MSG_INFO,
1900 "EAP-TEAP: Too short message to include Message Length field");
1901 return;
1902 }
1903
1904 message_len = WPA_GET_BE32(pos);
1905 pos += 4;
1906 len -= 4;
1907 if (message_len < 4) {
1908 wpa_printf(MSG_INFO,
1909 "EAP-TEAP: Message Length field has too msall value to include Outer TLV Length field");
1910 return;
1911 }
1912 }
1913
1914 if (len < 4) {
1915 wpa_printf(MSG_INFO,
1916 "EAP-TEAP: Too short message to include Outer TLVs Length field");
1917 return;
1918 }
1919
1920 outer_tlv_len = WPA_GET_BE32(pos);
1921 pos += 4;
1922 len -= 4;
1923
1924 wpa_printf(MSG_DEBUG,
1925 "EAP-TEAP: Message Length %u Outer TLV Length %u",
1926 message_len, outer_tlv_len);
1927 if (len < outer_tlv_len) {
1928 wpa_printf(MSG_INFO,
1929 "EAP-TEAP: Too short message to include Outer TLVs field");
1930 return;
1931 }
1932
1933 if (message_len &&
1934 (message_len < outer_tlv_len ||
1935 message_len < 4 + outer_tlv_len)) {
1936 wpa_printf(MSG_INFO,
1937 "EAP-TEAP: Message Length field has too small value to include Outer TLVs");
1938 return;
1939 }
1940
1941 if (wpabuf_len(respData) < 4 + outer_tlv_len ||
1942 len < outer_tlv_len)
1943 return;
1944 resp = wpabuf_alloc(wpabuf_len(respData) - 4 - outer_tlv_len);
1945 if (!resp)
1946 return;
1947 hdr = wpabuf_head(respData);
1948 wpabuf_put_u8(resp, *hdr++); /* Code */
1949 wpabuf_put_u8(resp, *hdr++); /* Identifier */
1950 wpabuf_put_be16(resp, WPA_GET_BE16(hdr) - 4 - outer_tlv_len);
1951 hdr += 2;
1952 wpabuf_put_u8(resp, *hdr++); /* Type */
1953 /* Flags | Ver */
1954 wpabuf_put_u8(resp, flags & ~EAP_TEAP_FLAGS_OUTER_TLV_LEN);
1955
1956 if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED)
1957 wpabuf_put_be32(resp, message_len - 4 - outer_tlv_len);
1958
1959 wpabuf_put_data(resp, pos, len - outer_tlv_len);
1960 pos += len - outer_tlv_len;
1961 wpabuf_free(data->peer_outer_tlvs);
1962 data->peer_outer_tlvs = wpabuf_alloc_copy(pos, outer_tlv_len);
1963 if (!data->peer_outer_tlvs)
1964 return;
1965 wpa_hexdump_buf(MSG_DEBUG, "EAP-TEAP: Outer TLVs",
1966 data->peer_outer_tlvs);
1967
1968 wpa_hexdump_buf(MSG_DEBUG,
1969 "EAP-TEAP: TLS Data message after Outer TLV removal",
1970 resp);
1971 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TEAP, resp,
1972 &len);
1973 if (!pos || len < 1) {
1974 wpa_printf(MSG_INFO,
1975 "EAP-TEAP: Invalid frame after Outer TLV removal");
1976 return;
1977 }
1978 }
1979
1980 if (data->state == PHASE1)
1981 eap_teap_state(data, PHASE1B);
1982
1983 if (eap_server_tls_process(sm, &data->ssl, resp, data,
1984 EAP_TYPE_TEAP, eap_teap_process_version,
1985 eap_teap_process_msg) < 0)
1986 eap_teap_state(data, FAILURE);
1987
1988 if (resp != respData)
1989 wpabuf_free(resp);
1990 }
1991
1992
eap_teap_isDone(struct eap_sm * sm,void * priv)1993 static bool eap_teap_isDone(struct eap_sm *sm, void *priv)
1994 {
1995 struct eap_teap_data *data = priv;
1996
1997 return data->state == SUCCESS || data->state == FAILURE;
1998 }
1999
2000
eap_teap_getKey(struct eap_sm * sm,void * priv,size_t * len)2001 static u8 * eap_teap_getKey(struct eap_sm *sm, void *priv, size_t *len)
2002 {
2003 struct eap_teap_data *data = priv;
2004 u8 *eapKeyData;
2005
2006 if (data->state != SUCCESS)
2007 return NULL;
2008
2009 eapKeyData = os_malloc(EAP_TEAP_KEY_LEN);
2010 if (!eapKeyData)
2011 return NULL;
2012
2013 /* FIX: RFC 7170 does not describe whether MSK or EMSK based S-IMCK[j]
2014 * is used in this derivation */
2015 if (eap_teap_derive_eap_msk(data->tls_cs, data->simck_msk,
2016 eapKeyData) < 0) {
2017 os_free(eapKeyData);
2018 return NULL;
2019 }
2020 *len = EAP_TEAP_KEY_LEN;
2021
2022 return eapKeyData;
2023 }
2024
2025
eap_teap_get_emsk(struct eap_sm * sm,void * priv,size_t * len)2026 static u8 * eap_teap_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
2027 {
2028 struct eap_teap_data *data = priv;
2029 u8 *eapKeyData;
2030
2031 if (data->state != SUCCESS)
2032 return NULL;
2033
2034 eapKeyData = os_malloc(EAP_EMSK_LEN);
2035 if (!eapKeyData)
2036 return NULL;
2037
2038 /* FIX: RFC 7170 does not describe whether MSK or EMSK based S-IMCK[j]
2039 * is used in this derivation */
2040 if (eap_teap_derive_eap_emsk(data->tls_cs, data->simck_msk,
2041 eapKeyData) < 0) {
2042 os_free(eapKeyData);
2043 return NULL;
2044 }
2045 *len = EAP_EMSK_LEN;
2046
2047 return eapKeyData;
2048 }
2049
2050
eap_teap_isSuccess(struct eap_sm * sm,void * priv)2051 static bool eap_teap_isSuccess(struct eap_sm *sm, void *priv)
2052 {
2053 struct eap_teap_data *data = priv;
2054
2055 return data->state == SUCCESS;
2056 }
2057
2058
eap_teap_get_session_id(struct eap_sm * sm,void * priv,size_t * len)2059 static u8 * eap_teap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
2060 {
2061 struct eap_teap_data *data = priv;
2062 const size_t max_id_len = 100;
2063 int res;
2064 u8 *id;
2065
2066 if (data->state != SUCCESS)
2067 return NULL;
2068
2069 id = os_malloc(max_id_len);
2070 if (!id)
2071 return NULL;
2072
2073 id[0] = EAP_TYPE_TEAP;
2074 res = tls_get_tls_unique(data->ssl.conn, id + 1, max_id_len - 1);
2075 if (res < 0) {
2076 os_free(id);
2077 wpa_printf(MSG_ERROR, "EAP-TEAP: Failed to derive Session-Id");
2078 return NULL;
2079 }
2080
2081 *len = 1 + res;
2082 wpa_hexdump(MSG_DEBUG, "EAP-TEAP: Derived Session-Id", id, *len);
2083 return id;
2084 }
2085
2086
eap_server_teap_register(void)2087 int eap_server_teap_register(void)
2088 {
2089 struct eap_method *eap;
2090
2091 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
2092 EAP_VENDOR_IETF, EAP_TYPE_TEAP, "TEAP");
2093 if (!eap)
2094 return -1;
2095
2096 eap->init = eap_teap_init;
2097 eap->reset = eap_teap_reset;
2098 eap->buildReq = eap_teap_buildReq;
2099 eap->check = eap_teap_check;
2100 eap->process = eap_teap_process;
2101 eap->isDone = eap_teap_isDone;
2102 eap->getKey = eap_teap_getKey;
2103 eap->get_emsk = eap_teap_get_emsk;
2104 eap->isSuccess = eap_teap_isSuccess;
2105 eap->getSessionId = eap_teap_get_session_id;
2106
2107 return eap_server_method_register(eap);
2108 }
2109
