1 /*
2 * EAP-FAST server (RFC 4851)
3 * Copyright (c) 2004-2008, 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/sha1.h"
14 #include "crypto/tls.h"
15 #include "crypto/random.h"
16 #include "eap_common/eap_tlv_common.h"
17 #include "eap_common/eap_fast_common.h"
18 #include "eap_i.h"
19 #include "eap_tls_common.h"
20
21
22 static void eap_fast_reset(struct eap_sm *sm, void *priv);
23
24
25 /* Private PAC-Opaque TLV types */
26 #define PAC_OPAQUE_TYPE_PAD 0
27 #define PAC_OPAQUE_TYPE_KEY 1
28 #define PAC_OPAQUE_TYPE_LIFETIME 2
29 #define PAC_OPAQUE_TYPE_IDENTITY 3
30
31 struct eap_fast_data {
32 struct eap_ssl_data ssl;
33 enum {
34 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
35 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
36 } state;
37
38 int fast_version;
39 const struct eap_method *phase2_method;
40 void *phase2_priv;
41 int force_version;
42 int peer_version;
43
44 u8 crypto_binding_nonce[32];
45 int final_result;
46
47 struct eap_fast_key_block_provisioning *key_block_p;
48
49 u8 simck[EAP_FAST_SIMCK_LEN];
50 u8 cmk[EAP_FAST_CMK_LEN];
51 int simck_idx;
52
53 u8 pac_opaque_encr[16];
54 u8 *srv_id;
55 size_t srv_id_len;
56 char *srv_id_info;
57
58 int anon_provisioning;
59 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
60 struct wpabuf *pending_phase2_resp;
61 u8 *identity; /* from PAC-Opaque */
62 size_t identity_len;
63 int eap_seq;
64 int tnc_started;
65
66 int pac_key_lifetime;
67 int pac_key_refresh_time;
68 };
69
70
71 static int eap_fast_process_phase2_start(struct eap_sm *sm,
72 struct eap_fast_data *data);
73
74
eap_fast_state_txt(int state)75 static const char * eap_fast_state_txt(int state)
76 {
77 switch (state) {
78 case START:
79 return "START";
80 case PHASE1:
81 return "PHASE1";
82 case PHASE2_START:
83 return "PHASE2_START";
84 case PHASE2_ID:
85 return "PHASE2_ID";
86 case PHASE2_METHOD:
87 return "PHASE2_METHOD";
88 case CRYPTO_BINDING:
89 return "CRYPTO_BINDING";
90 case REQUEST_PAC:
91 return "REQUEST_PAC";
92 case SUCCESS:
93 return "SUCCESS";
94 case FAILURE:
95 return "FAILURE";
96 default:
97 return "Unknown?!";
98 }
99 }
100
101
eap_fast_state(struct eap_fast_data * data,int state)102 static void eap_fast_state(struct eap_fast_data *data, int state)
103 {
104 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105 eap_fast_state_txt(data->state),
106 eap_fast_state_txt(state));
107 data->state = state;
108 }
109
110
eap_fast_req_failure(struct eap_sm * sm,struct eap_fast_data * data)111 static enum eap_type eap_fast_req_failure(struct eap_sm *sm,
112 struct eap_fast_data *data)
113 {
114 /* TODO: send Result TLV(FAILURE) */
115 eap_fast_state(data, FAILURE);
116 return EAP_TYPE_NONE;
117 }
118
119
eap_fast_session_ticket_cb(void * ctx,const u8 * ticket,size_t len,const u8 * client_random,const u8 * server_random,u8 * master_secret)120 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
121 const u8 *client_random,
122 const u8 *server_random,
123 u8 *master_secret)
124 {
125 struct eap_fast_data *data = ctx;
126 const u8 *pac_opaque;
127 size_t pac_opaque_len;
128 u8 *buf, *pos, *end, *pac_key = NULL;
129 os_time_t lifetime = 0;
130 struct os_time now;
131 u8 *identity = NULL;
132 size_t identity_len = 0;
133
134 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136 ticket, len);
137
138 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140 "SessionTicket");
141 return 0;
142 }
143
144 pac_opaque_len = WPA_GET_BE16(ticket + 2);
145 pac_opaque = ticket + 4;
146 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147 pac_opaque_len > len - 4) {
148 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
149 "(len=%lu left=%lu)",
150 (unsigned long) pac_opaque_len,
151 (unsigned long) len);
152 return 0;
153 }
154 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155 pac_opaque, pac_opaque_len);
156
157 buf = os_malloc(pac_opaque_len - 8);
158 if (buf == NULL) {
159 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
160 "for decrypting PAC-Opaque");
161 return 0;
162 }
163
164 if (aes_unwrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
165 (pac_opaque_len - 8) / 8, pac_opaque, buf) < 0) {
166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167 "PAC-Opaque");
168 os_free(buf);
169 /*
170 * This may have been caused by server changing the PAC-Opaque
171 * encryption key, so just ignore this PAC-Opaque instead of
172 * failing the authentication completely. Provisioning can now
173 * be used to provision a new PAC.
174 */
175 return 0;
176 }
177
178 end = buf + pac_opaque_len - 8;
179 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 buf, end - buf);
181
182 pos = buf;
183 while (end - pos > 1) {
184 u8 id, elen;
185
186 id = *pos++;
187 elen = *pos++;
188 if (elen > end - pos)
189 break;
190
191 switch (id) {
192 case PAC_OPAQUE_TYPE_PAD:
193 goto done;
194 case PAC_OPAQUE_TYPE_KEY:
195 if (elen != EAP_FAST_PAC_KEY_LEN) {
196 wpa_printf(MSG_DEBUG,
197 "EAP-FAST: Invalid PAC-Key length %d",
198 elen);
199 os_free(buf);
200 return -1;
201 }
202 pac_key = pos;
203 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
204 "decrypted PAC-Opaque",
205 pac_key, EAP_FAST_PAC_KEY_LEN);
206 break;
207 case PAC_OPAQUE_TYPE_LIFETIME:
208 if (elen != 4) {
209 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
210 "PAC-Key lifetime length %d",
211 elen);
212 os_free(buf);
213 return -1;
214 }
215 lifetime = WPA_GET_BE32(pos);
216 break;
217 case PAC_OPAQUE_TYPE_IDENTITY:
218 identity = pos;
219 identity_len = elen;
220 break;
221 }
222
223 pos += elen;
224 }
225 done:
226
227 if (pac_key == NULL) {
228 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
229 "PAC-Opaque");
230 os_free(buf);
231 return -1;
232 }
233
234 if (identity) {
235 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
236 "PAC-Opaque", identity, identity_len);
237 os_free(data->identity);
238 data->identity = os_malloc(identity_len);
239 if (data->identity) {
240 os_memcpy(data->identity, identity, identity_len);
241 data->identity_len = identity_len;
242 }
243 }
244
245 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
246 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
247 "(lifetime=%ld now=%ld)", lifetime, now.sec);
248 data->send_new_pac = 2;
249 /*
250 * Allow PAC to be used to allow a PAC update with some level
251 * of server authentication (i.e., do not fall back to full TLS
252 * handshake since we cannot be sure that the peer would be
253 * able to validate server certificate now). However, reject
254 * the authentication since the PAC was not valid anymore. Peer
255 * can connect again with the newly provisioned PAC after this.
256 */
257 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
258 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
259 "an update if authentication succeeds");
260 data->send_new_pac = 1;
261 }
262
263 eap_fast_derive_master_secret(pac_key, server_random, client_random,
264 master_secret);
265
266 os_free(buf);
267
268 return 1;
269 }
270
271
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)272 static void eap_fast_derive_key_auth(struct eap_sm *sm,
273 struct eap_fast_data *data)
274 {
275 u8 *sks;
276
277 /* RFC 4851, Section 5.1:
278 * Extra key material after TLS key_block: session_key_seed[40]
279 */
280
281 sks = eap_fast_derive_key(sm->cfg->ssl_ctx, data->ssl.conn,
282 EAP_FAST_SKS_LEN);
283 if (sks == NULL) {
284 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
285 "session_key_seed");
286 return;
287 }
288
289 /*
290 * RFC 4851, Section 5.2:
291 * S-IMCK[0] = session_key_seed
292 */
293 wpa_hexdump_key(MSG_DEBUG,
294 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
295 sks, EAP_FAST_SKS_LEN);
296 data->simck_idx = 0;
297 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
298 os_free(sks);
299 }
300
301
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)302 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
303 struct eap_fast_data *data)
304 {
305 os_free(data->key_block_p);
306 data->key_block_p = (struct eap_fast_key_block_provisioning *)
307 eap_fast_derive_key(sm->cfg->ssl_ctx, data->ssl.conn,
308 sizeof(*data->key_block_p));
309 if (data->key_block_p == NULL) {
310 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
311 return;
312 }
313 /*
314 * RFC 4851, Section 5.2:
315 * S-IMCK[0] = session_key_seed
316 */
317 wpa_hexdump_key(MSG_DEBUG,
318 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
319 data->key_block_p->session_key_seed,
320 sizeof(data->key_block_p->session_key_seed));
321 data->simck_idx = 0;
322 os_memcpy(data->simck, data->key_block_p->session_key_seed,
323 EAP_FAST_SIMCK_LEN);
324 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
325 data->key_block_p->server_challenge,
326 sizeof(data->key_block_p->server_challenge));
327 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
328 data->key_block_p->client_challenge,
329 sizeof(data->key_block_p->client_challenge));
330 }
331
332
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)333 static int eap_fast_get_phase2_key(struct eap_sm *sm,
334 struct eap_fast_data *data,
335 u8 *isk, size_t isk_len)
336 {
337 u8 *key;
338 size_t key_len;
339
340 os_memset(isk, 0, isk_len);
341
342 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
343 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
344 "available");
345 return -1;
346 }
347
348 if (data->phase2_method->getKey == NULL)
349 return 0;
350
351 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
352 &key_len)) == NULL) {
353 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
354 "from Phase 2");
355 return -1;
356 }
357
358 if (key_len > isk_len)
359 key_len = isk_len;
360 if (key_len == 32 &&
361 data->phase2_method->vendor == EAP_VENDOR_IETF &&
362 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
363 /*
364 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
365 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
366 * ISK for EAP-FAST cryptobinding.
367 */
368 os_memcpy(isk, key + 16, 16);
369 os_memcpy(isk + 16, key, 16);
370 } else
371 os_memcpy(isk, key, key_len);
372 os_free(key);
373
374 return 0;
375 }
376
377
eap_fast_update_icmk(struct eap_sm * sm,struct eap_fast_data * data)378 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
379 {
380 u8 isk[32], imck[60];
381
382 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
383 data->simck_idx + 1);
384
385 /*
386 * RFC 4851, Section 5.2:
387 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
388 * MSK[j], 60)
389 * S-IMCK[j] = first 40 octets of IMCK[j]
390 * CMK[j] = last 20 octets of IMCK[j]
391 */
392
393 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
394 return -1;
395 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
396 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
397 "Inner Methods Compound Keys",
398 isk, sizeof(isk), imck, sizeof(imck));
399 data->simck_idx++;
400 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
401 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
402 data->simck, EAP_FAST_SIMCK_LEN);
403 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
404 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
405 data->cmk, EAP_FAST_CMK_LEN);
406
407 return 0;
408 }
409
410
eap_fast_init(struct eap_sm * sm)411 static void * eap_fast_init(struct eap_sm *sm)
412 {
413 struct eap_fast_data *data;
414 u8 ciphers[7] = {
415 TLS_CIPHER_ANON_DH_AES128_SHA,
416 TLS_CIPHER_AES128_SHA,
417 TLS_CIPHER_RSA_DHE_AES128_SHA,
418 TLS_CIPHER_RC4_SHA,
419 TLS_CIPHER_RSA_DHE_AES256_SHA,
420 TLS_CIPHER_AES256_SHA,
421 TLS_CIPHER_NONE
422 };
423
424 data = os_zalloc(sizeof(*data));
425 if (data == NULL)
426 return NULL;
427 data->fast_version = EAP_FAST_VERSION;
428 data->force_version = -1;
429 if (sm->user && sm->user->force_version >= 0) {
430 data->force_version = sm->user->force_version;
431 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
432 data->force_version);
433 data->fast_version = data->force_version;
434 }
435 data->state = START;
436
437 if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_FAST)) {
438 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
439 eap_fast_reset(sm, data);
440 return NULL;
441 }
442
443 if (tls_connection_set_cipher_list(sm->cfg->ssl_ctx, data->ssl.conn,
444 ciphers) < 0) {
445 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
446 "suites");
447 eap_fast_reset(sm, data);
448 return NULL;
449 }
450
451 if (tls_connection_set_session_ticket_cb(sm->cfg->ssl_ctx,
452 data->ssl.conn,
453 eap_fast_session_ticket_cb,
454 data) < 0) {
455 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
456 "callback");
457 eap_fast_reset(sm, data);
458 return NULL;
459 }
460
461 if (sm->cfg->pac_opaque_encr_key == NULL) {
462 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
463 "configured");
464 eap_fast_reset(sm, data);
465 return NULL;
466 }
467 os_memcpy(data->pac_opaque_encr, sm->cfg->pac_opaque_encr_key,
468 sizeof(data->pac_opaque_encr));
469
470 if (sm->cfg->eap_fast_a_id == NULL) {
471 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
472 eap_fast_reset(sm, data);
473 return NULL;
474 }
475 data->srv_id = os_memdup(sm->cfg->eap_fast_a_id,
476 sm->cfg->eap_fast_a_id_len);
477 if (data->srv_id == NULL) {
478 eap_fast_reset(sm, data);
479 return NULL;
480 }
481 data->srv_id_len = sm->cfg->eap_fast_a_id_len;
482
483 if (sm->cfg->eap_fast_a_id_info == NULL) {
484 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
485 eap_fast_reset(sm, data);
486 return NULL;
487 }
488 data->srv_id_info = os_strdup(sm->cfg->eap_fast_a_id_info);
489 if (data->srv_id_info == NULL) {
490 eap_fast_reset(sm, data);
491 return NULL;
492 }
493
494 /* PAC-Key lifetime in seconds (hard limit) */
495 data->pac_key_lifetime = sm->cfg->pac_key_lifetime;
496
497 /*
498 * PAC-Key refresh time in seconds (soft limit on remaining hard
499 * limit). The server will generate a new PAC-Key when this number of
500 * seconds (or fewer) of the lifetime remains.
501 */
502 data->pac_key_refresh_time = sm->cfg->pac_key_refresh_time;
503
504 return data;
505 }
506
507
eap_fast_reset(struct eap_sm * sm,void * priv)508 static void eap_fast_reset(struct eap_sm *sm, void *priv)
509 {
510 struct eap_fast_data *data = priv;
511 if (data == NULL)
512 return;
513 if (data->phase2_priv && data->phase2_method)
514 data->phase2_method->reset(sm, data->phase2_priv);
515 eap_server_tls_ssl_deinit(sm, &data->ssl);
516 os_free(data->srv_id);
517 os_free(data->srv_id_info);
518 os_free(data->key_block_p);
519 wpabuf_free(data->pending_phase2_resp);
520 os_free(data->identity);
521 bin_clear_free(data, sizeof(*data));
522 }
523
524
eap_fast_build_start(struct eap_sm * sm,struct eap_fast_data * data,u8 id)525 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
526 struct eap_fast_data *data, u8 id)
527 {
528 struct wpabuf *req;
529
530 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
531 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
532 EAP_CODE_REQUEST, id);
533 if (req == NULL) {
534 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
535 " request");
536 eap_fast_state(data, FAILURE);
537 return NULL;
538 }
539
540 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
541
542 /* RFC 4851, 4.1.1. Authority ID Data */
543 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
544
545 eap_fast_state(data, PHASE1);
546
547 return req;
548 }
549
550
eap_fast_phase1_done(struct eap_sm * sm,struct eap_fast_data * data)551 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
552 {
553 char cipher[64];
554
555 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
556
557 if (tls_get_cipher(sm->cfg->ssl_ctx, data->ssl.conn,
558 cipher, sizeof(cipher)) < 0) {
559 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
560 "information");
561 eap_fast_state(data, FAILURE);
562 return -1;
563 }
564 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
565
566 if (data->anon_provisioning) {
567 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
568 eap_fast_derive_key_provisioning(sm, data);
569 } else
570 eap_fast_derive_key_auth(sm, data);
571
572 eap_fast_state(data, PHASE2_START);
573
574 return 0;
575 }
576
577
eap_fast_build_phase2_req(struct eap_sm * sm,struct eap_fast_data * data,u8 id)578 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
579 struct eap_fast_data *data,
580 u8 id)
581 {
582 struct wpabuf *req;
583
584 if (data->phase2_priv == NULL) {
585 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
586 "initialized");
587 return NULL;
588 }
589 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
590 if (req == NULL)
591 return NULL;
592
593 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
594 return eap_fast_tlv_eap_payload(req);
595 }
596
597
eap_fast_build_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data)598 static struct wpabuf * eap_fast_build_crypto_binding(
599 struct eap_sm *sm, struct eap_fast_data *data)
600 {
601 struct wpabuf *buf;
602 struct eap_tlv_result_tlv *result;
603 struct eap_tlv_crypto_binding_tlv *binding;
604
605 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
606 if (buf == NULL)
607 return NULL;
608
609 if (data->send_new_pac || data->anon_provisioning ||
610 data->phase2_method)
611 data->final_result = 0;
612 else
613 data->final_result = 1;
614
615 if (!data->final_result || data->eap_seq > 1) {
616 /* Intermediate-Result */
617 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
618 "(status=SUCCESS)");
619 result = wpabuf_put(buf, sizeof(*result));
620 result->tlv_type = host_to_be16(
621 EAP_TLV_TYPE_MANDATORY |
622 EAP_TLV_INTERMEDIATE_RESULT_TLV);
623 result->length = host_to_be16(2);
624 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
625 }
626
627 if (data->final_result) {
628 /* Result TLV */
629 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
630 "(status=SUCCESS)");
631 result = wpabuf_put(buf, sizeof(*result));
632 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
633 EAP_TLV_RESULT_TLV);
634 result->length = host_to_be16(2);
635 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
636 }
637
638 /* Crypto-Binding TLV */
639 binding = wpabuf_put(buf, sizeof(*binding));
640 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
641 EAP_TLV_CRYPTO_BINDING_TLV);
642 binding->length = host_to_be16(sizeof(*binding) -
643 sizeof(struct eap_tlv_hdr));
644 binding->version = EAP_FAST_VERSION;
645 binding->received_version = data->peer_version;
646 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
647 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
648 wpabuf_free(buf);
649 return NULL;
650 }
651
652 /*
653 * RFC 4851, Section 4.2.8:
654 * The nonce in a request MUST have its least significant bit set to 0.
655 */
656 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
657
658 os_memcpy(data->crypto_binding_nonce, binding->nonce,
659 sizeof(binding->nonce));
660
661 /*
662 * RFC 4851, Section 5.3:
663 * CMK = CMK[j]
664 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
665 */
666
667 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
668 (u8 *) binding, sizeof(*binding),
669 binding->compound_mac);
670
671 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
672 "Received Version %d SubType %d",
673 binding->version, binding->received_version,
674 binding->subtype);
675 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
676 binding->nonce, sizeof(binding->nonce));
677 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
678 binding->compound_mac, sizeof(binding->compound_mac));
679
680 return buf;
681 }
682
683
eap_fast_build_pac(struct eap_sm * sm,struct eap_fast_data * data)684 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
685 struct eap_fast_data *data)
686 {
687 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
688 u8 *pac_buf, *pac_opaque;
689 struct wpabuf *buf;
690 u8 *pos;
691 size_t buf_len, srv_id_info_len, pac_len;
692 struct eap_tlv_hdr *pac_tlv;
693 struct pac_tlv_hdr *pac_info;
694 struct eap_tlv_result_tlv *result;
695 struct os_time now;
696
697 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
698 os_get_time(&now) < 0)
699 return NULL;
700 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
701 pac_key, EAP_FAST_PAC_KEY_LEN);
702
703 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
704 (2 + sm->identity_len) + 8;
705 pac_buf = os_malloc(pac_len);
706 if (pac_buf == NULL)
707 return NULL;
708
709 srv_id_info_len = os_strlen(data->srv_id_info);
710
711 pos = pac_buf;
712 *pos++ = PAC_OPAQUE_TYPE_KEY;
713 *pos++ = EAP_FAST_PAC_KEY_LEN;
714 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
715 pos += EAP_FAST_PAC_KEY_LEN;
716
717 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
718 *pos++ = 4;
719 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
720 pos += 4;
721
722 if (sm->identity) {
723 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
724 *pos++ = sm->identity_len;
725 os_memcpy(pos, sm->identity, sm->identity_len);
726 pos += sm->identity_len;
727 }
728
729 pac_len = pos - pac_buf;
730 while (pac_len % 8) {
731 *pos++ = PAC_OPAQUE_TYPE_PAD;
732 pac_len++;
733 }
734
735 pac_opaque = os_malloc(pac_len + 8);
736 if (pac_opaque == NULL) {
737 os_free(pac_buf);
738 return NULL;
739 }
740 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
741 pac_len / 8, pac_buf, pac_opaque) < 0) {
742 os_free(pac_buf);
743 os_free(pac_opaque);
744 return NULL;
745 }
746 os_free(pac_buf);
747
748 pac_len += 8;
749 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
750 pac_opaque, pac_len);
751
752 buf_len = sizeof(*pac_tlv) +
753 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
754 sizeof(struct pac_tlv_hdr) + pac_len +
755 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
756 buf = wpabuf_alloc(buf_len);
757 if (buf == NULL) {
758 os_free(pac_opaque);
759 return NULL;
760 }
761
762 /* Result TLV */
763 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
764 result = wpabuf_put(buf, sizeof(*result));
765 WPA_PUT_BE16((u8 *) &result->tlv_type,
766 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
767 WPA_PUT_BE16((u8 *) &result->length, 2);
768 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
769
770 /* PAC TLV */
771 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
772 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
773 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
774 EAP_TLV_PAC_TLV);
775
776 /* PAC-Key */
777 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
778
779 /* PAC-Opaque */
780 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
781 os_free(pac_opaque);
782
783 /* PAC-Info */
784 pac_info = wpabuf_put(buf, sizeof(*pac_info));
785 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
786
787 /* PAC-Lifetime (inside PAC-Info) */
788 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
789 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
790
791 /* A-ID (inside PAC-Info) */
792 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
793
794 /* Note: headers may be misaligned after A-ID */
795
796 if (sm->identity) {
797 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
798 sm->identity_len);
799 }
800
801 /* A-ID-Info (inside PAC-Info) */
802 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
803 srv_id_info_len);
804
805 /* PAC-Type (inside PAC-Info) */
806 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
807 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
808
809 /* Update PAC-Info and PAC TLV Length fields */
810 pos = wpabuf_put(buf, 0);
811 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
812 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
813
814 return buf;
815 }
816
817
eap_fast_encrypt_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * plain,int piggyback)818 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
819 struct eap_fast_data *data,
820 struct wpabuf *plain, int piggyback)
821 {
822 struct wpabuf *encr;
823
824 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
825 plain);
826 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
827 wpabuf_free(plain);
828
829 if (!encr)
830 return -1;
831
832 if (data->ssl.tls_out && piggyback) {
833 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
834 "(len=%d) with last Phase 1 Message (len=%d "
835 "used=%d)",
836 (int) wpabuf_len(encr),
837 (int) wpabuf_len(data->ssl.tls_out),
838 (int) data->ssl.tls_out_pos);
839 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
840 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
841 "output buffer");
842 wpabuf_free(encr);
843 return -1;
844 }
845 wpabuf_put_buf(data->ssl.tls_out, encr);
846 wpabuf_free(encr);
847 } else {
848 wpabuf_free(data->ssl.tls_out);
849 data->ssl.tls_out_pos = 0;
850 data->ssl.tls_out = encr;
851 }
852
853 return 0;
854 }
855
856
eap_fast_buildReq(struct eap_sm * sm,void * priv,u8 id)857 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
858 {
859 struct eap_fast_data *data = priv;
860 struct wpabuf *req = NULL;
861 int piggyback = 0;
862
863 if (data->ssl.state == FRAG_ACK) {
864 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
865 data->fast_version);
866 }
867
868 if (data->ssl.state == WAIT_FRAG_ACK) {
869 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
870 data->fast_version, id);
871 }
872
873 switch (data->state) {
874 case START:
875 return eap_fast_build_start(sm, data, id);
876 case PHASE1:
877 if (tls_connection_established(sm->cfg->ssl_ctx,
878 data->ssl.conn)) {
879 if (eap_fast_phase1_done(sm, data) < 0)
880 return NULL;
881 if (data->state == PHASE2_START) {
882 /*
883 * Try to generate Phase 2 data to piggyback
884 * with the end of Phase 1 to avoid extra
885 * roundtrip.
886 */
887 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
888 "Phase 2");
889 if (eap_fast_process_phase2_start(sm, data))
890 break;
891 req = eap_fast_build_phase2_req(sm, data, id);
892 piggyback = 1;
893 }
894 }
895 break;
896 case PHASE2_ID:
897 case PHASE2_METHOD:
898 req = eap_fast_build_phase2_req(sm, data, id);
899 break;
900 case CRYPTO_BINDING:
901 req = eap_fast_build_crypto_binding(sm, data);
902 if (data->phase2_method) {
903 /*
904 * Include the start of the next EAP method in the
905 * sequence in the same message with Crypto-Binding to
906 * save a round-trip.
907 */
908 struct wpabuf *eap;
909 eap = eap_fast_build_phase2_req(sm, data, id);
910 req = wpabuf_concat(req, eap);
911 eap_fast_state(data, PHASE2_METHOD);
912 }
913 break;
914 case REQUEST_PAC:
915 req = eap_fast_build_pac(sm, data);
916 break;
917 default:
918 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
919 __func__, data->state);
920 return NULL;
921 }
922
923 if (req &&
924 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
925 return NULL;
926
927 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
928 data->fast_version, id);
929 }
930
931
eap_fast_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)932 static bool eap_fast_check(struct eap_sm *sm, void *priv,
933 struct wpabuf *respData)
934 {
935 const u8 *pos;
936 size_t len;
937
938 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
939 if (pos == NULL || len < 1) {
940 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
941 return true;
942 }
943
944 return false;
945 }
946
947
eap_fast_phase2_init(struct eap_sm * sm,struct eap_fast_data * data,int vendor,enum eap_type eap_type)948 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
949 int vendor, enum eap_type eap_type)
950 {
951 if (data->phase2_priv && data->phase2_method) {
952 data->phase2_method->reset(sm, data->phase2_priv);
953 data->phase2_method = NULL;
954 data->phase2_priv = NULL;
955 }
956 data->phase2_method = eap_server_get_eap_method(vendor, eap_type);
957 if (!data->phase2_method)
958 return -1;
959
960 if (data->key_block_p) {
961 sm->auth_challenge = data->key_block_p->server_challenge;
962 sm->peer_challenge = data->key_block_p->client_challenge;
963 }
964 sm->init_phase2 = 1;
965 data->phase2_priv = data->phase2_method->init(sm);
966 sm->init_phase2 = 0;
967 sm->auth_challenge = NULL;
968 sm->peer_challenge = NULL;
969
970 return data->phase2_priv == NULL ? -1 : 0;
971 }
972
973
eap_fast_process_phase2_response(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)974 static void eap_fast_process_phase2_response(struct eap_sm *sm,
975 struct eap_fast_data *data,
976 u8 *in_data, size_t in_len)
977 {
978 int next_vendor = EAP_VENDOR_IETF;
979 enum eap_type next_type = EAP_TYPE_NONE;
980 struct eap_hdr *hdr;
981 u8 *pos;
982 size_t left;
983 struct wpabuf buf;
984 const struct eap_method *m = data->phase2_method;
985 void *priv = data->phase2_priv;
986
987 if (priv == NULL) {
988 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
989 "initialized?!", __func__);
990 return;
991 }
992
993 hdr = (struct eap_hdr *) in_data;
994 pos = (u8 *) (hdr + 1);
995
996 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
997 left = in_len - sizeof(*hdr);
998 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
999 "allowed types", pos + 1, left - 1);
1000 #ifdef EAP_SERVER_TNC
1001 if (m && m->vendor == EAP_VENDOR_IETF &&
1002 m->method == EAP_TYPE_TNC) {
1003 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
1004 "TNC negotiation");
1005 next_vendor = EAP_VENDOR_IETF;
1006 next_type = eap_fast_req_failure(sm, data);
1007 eap_fast_phase2_init(sm, data, next_vendor, next_type);
1008 return;
1009 }
1010 #endif /* EAP_SERVER_TNC */
1011 eap_sm_process_nak(sm, pos + 1, left - 1);
1012 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1013 sm->user->methods[sm->user_eap_method_index].method !=
1014 EAP_TYPE_NONE) {
1015 next_vendor = sm->user->methods[
1016 sm->user_eap_method_index].vendor;
1017 next_type = sm->user->methods[
1018 sm->user_eap_method_index++].method;
1019 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %u:%u",
1020 next_vendor, next_type);
1021 } else {
1022 next_vendor = EAP_VENDOR_IETF;
1023 next_type = eap_fast_req_failure(sm, data);
1024 }
1025 eap_fast_phase2_init(sm, data, next_vendor, next_type);
1026 return;
1027 }
1028
1029 wpabuf_set(&buf, in_data, in_len);
1030
1031 if (m->check(sm, priv, &buf)) {
1032 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1033 "ignore the packet");
1034 eap_fast_req_failure(sm, data);
1035 return;
1036 }
1037
1038 m->process(sm, priv, &buf);
1039
1040 if (!m->isDone(sm, priv))
1041 return;
1042
1043 if (!m->isSuccess(sm, priv)) {
1044 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1045 next_vendor = EAP_VENDOR_IETF;
1046 next_type = eap_fast_req_failure(sm, data);
1047 eap_fast_phase2_init(sm, data, next_vendor, next_type);
1048 return;
1049 }
1050
1051 switch (data->state) {
1052 case PHASE2_ID:
1053 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1054 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1055 "Identity not found in the user "
1056 "database",
1057 sm->identity, sm->identity_len);
1058 next_vendor = EAP_VENDOR_IETF;
1059 next_type = eap_fast_req_failure(sm, data);
1060 break;
1061 }
1062
1063 eap_fast_state(data, PHASE2_METHOD);
1064 if (data->anon_provisioning) {
1065 /*
1066 * Only EAP-MSCHAPv2 is allowed for anonymous
1067 * provisioning.
1068 */
1069 next_vendor = EAP_VENDOR_IETF;
1070 next_type = EAP_TYPE_MSCHAPV2;
1071 sm->user_eap_method_index = 0;
1072 } else {
1073 next_vendor = sm->user->methods[0].vendor;
1074 next_type = sm->user->methods[0].method;
1075 sm->user_eap_method_index = 1;
1076 }
1077 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %u:%u",
1078 next_vendor, next_type);
1079 break;
1080 case PHASE2_METHOD:
1081 case CRYPTO_BINDING:
1082 eap_fast_update_icmk(sm, data);
1083 eap_fast_state(data, CRYPTO_BINDING);
1084 data->eap_seq++;
1085 next_vendor = EAP_VENDOR_IETF;
1086 next_type = EAP_TYPE_NONE;
1087 #ifdef EAP_SERVER_TNC
1088 if (sm->cfg->tnc && !data->tnc_started) {
1089 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1090 next_vendor = EAP_VENDOR_IETF;
1091 next_type = EAP_TYPE_TNC;
1092 data->tnc_started = 1;
1093 }
1094 #endif /* EAP_SERVER_TNC */
1095 break;
1096 case FAILURE:
1097 break;
1098 default:
1099 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1100 __func__, data->state);
1101 break;
1102 }
1103
1104 eap_fast_phase2_init(sm, data, next_vendor, next_type);
1105 }
1106
1107
eap_fast_process_phase2_eap(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)1108 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1109 struct eap_fast_data *data,
1110 u8 *in_data, size_t in_len)
1111 {
1112 struct eap_hdr *hdr;
1113 size_t len;
1114
1115 hdr = (struct eap_hdr *) in_data;
1116 if (in_len < (int) sizeof(*hdr)) {
1117 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1118 "EAP frame (len=%lu)", (unsigned long) in_len);
1119 eap_fast_req_failure(sm, data);
1120 return;
1121 }
1122 len = be_to_host16(hdr->length);
1123 if (len > in_len) {
1124 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1125 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1126 (unsigned long) in_len, (unsigned long) len);
1127 eap_fast_req_failure(sm, data);
1128 return;
1129 }
1130 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1131 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1132 (unsigned long) len);
1133 switch (hdr->code) {
1134 case EAP_CODE_RESPONSE:
1135 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1136 break;
1137 default:
1138 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1139 "Phase 2 EAP header", hdr->code);
1140 break;
1141 }
1142 }
1143
1144
eap_fast_parse_tlvs(struct wpabuf * data,struct eap_fast_tlv_parse * tlv)1145 static int eap_fast_parse_tlvs(struct wpabuf *data,
1146 struct eap_fast_tlv_parse *tlv)
1147 {
1148 int mandatory, tlv_type, res;
1149 size_t len;
1150 u8 *pos, *end;
1151
1152 os_memset(tlv, 0, sizeof(*tlv));
1153
1154 pos = wpabuf_mhead(data);
1155 end = pos + wpabuf_len(data);
1156 while (end - pos > 4) {
1157 mandatory = pos[0] & 0x80;
1158 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1159 pos += 2;
1160 len = WPA_GET_BE16(pos);
1161 pos += 2;
1162 if (len > (size_t) (end - pos)) {
1163 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1164 return -1;
1165 }
1166 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1167 "TLV type %d length %u%s",
1168 tlv_type, (unsigned int) len,
1169 mandatory ? " (mandatory)" : "");
1170
1171 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1172 if (res == -2)
1173 break;
1174 if (res < 0) {
1175 if (mandatory) {
1176 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1177 "mandatory TLV type %d", tlv_type);
1178 /* TODO: generate Nak TLV */
1179 break;
1180 } else {
1181 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1182 "unknown optional TLV type %d",
1183 tlv_type);
1184 }
1185 }
1186
1187 pos += len;
1188 }
1189
1190 return 0;
1191 }
1192
1193
eap_fast_validate_crypto_binding(struct eap_fast_data * data,struct eap_tlv_crypto_binding_tlv * b,size_t bind_len)1194 static int eap_fast_validate_crypto_binding(
1195 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1196 size_t bind_len)
1197 {
1198 u8 cmac[SHA1_MAC_LEN];
1199
1200 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1201 "Version %d Received Version %d SubType %d",
1202 b->version, b->received_version, b->subtype);
1203 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1204 b->nonce, sizeof(b->nonce));
1205 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1206 b->compound_mac, sizeof(b->compound_mac));
1207
1208 if (b->version != EAP_FAST_VERSION ||
1209 b->received_version != EAP_FAST_VERSION) {
1210 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1211 "in Crypto-Binding: version %d "
1212 "received_version %d", b->version,
1213 b->received_version);
1214 return -1;
1215 }
1216
1217 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1218 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1219 "Crypto-Binding: %d", b->subtype);
1220 return -1;
1221 }
1222
1223 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1224 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1225 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1226 "Crypto-Binding");
1227 return -1;
1228 }
1229
1230 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1231 os_memset(b->compound_mac, 0, sizeof(cmac));
1232 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1233 "Compound MAC calculation",
1234 (u8 *) b, bind_len);
1235 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1236 b->compound_mac);
1237 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1238 wpa_hexdump(MSG_MSGDUMP,
1239 "EAP-FAST: Calculated Compound MAC",
1240 b->compound_mac, sizeof(cmac));
1241 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1242 "match");
1243 return -1;
1244 }
1245
1246 return 0;
1247 }
1248
1249
eap_fast_pac_type(u8 * pac,size_t len,u16 type)1250 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1251 {
1252 struct eap_tlv_pac_type_tlv *tlv;
1253
1254 if (pac == NULL || len != sizeof(*tlv))
1255 return 0;
1256
1257 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1258
1259 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1260 be_to_host16(tlv->length) == 2 &&
1261 be_to_host16(tlv->pac_type) == type;
1262 }
1263
1264
eap_fast_process_phase2_tlvs(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_data)1265 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1266 struct eap_fast_data *data,
1267 struct wpabuf *in_data)
1268 {
1269 struct eap_fast_tlv_parse tlv;
1270 int check_crypto_binding = data->state == CRYPTO_BINDING;
1271
1272 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1273 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1274 "Phase 2 TLVs");
1275 return;
1276 }
1277
1278 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1279 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1280 "failure");
1281 eap_fast_state(data, FAILURE);
1282 return;
1283 }
1284
1285 if (data->state == REQUEST_PAC) {
1286 u16 type, len, res;
1287 if (tlv.pac == NULL || tlv.pac_len < 6) {
1288 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1289 "Acknowledgement received");
1290 eap_fast_state(data, FAILURE);
1291 return;
1292 }
1293
1294 type = WPA_GET_BE16(tlv.pac);
1295 len = WPA_GET_BE16(tlv.pac + 2);
1296 res = WPA_GET_BE16(tlv.pac + 4);
1297
1298 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1299 res != EAP_TLV_RESULT_SUCCESS) {
1300 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1301 "contain acknowledgement");
1302 eap_fast_state(data, FAILURE);
1303 return;
1304 }
1305
1306 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1307 "- PAC provisioning succeeded");
1308 eap_fast_state(data, (data->anon_provisioning ||
1309 data->send_new_pac == 2) ?
1310 FAILURE : SUCCESS);
1311 return;
1312 }
1313
1314 if (check_crypto_binding) {
1315 if (tlv.crypto_binding == NULL) {
1316 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1317 "TLV received");
1318 eap_fast_state(data, FAILURE);
1319 return;
1320 }
1321
1322 if (data->final_result &&
1323 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1324 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1325 "without Success Result");
1326 eap_fast_state(data, FAILURE);
1327 return;
1328 }
1329
1330 if (!data->final_result &&
1331 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1332 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1333 "without intermediate Success Result");
1334 eap_fast_state(data, FAILURE);
1335 return;
1336 }
1337
1338 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1339 tlv.crypto_binding_len)) {
1340 eap_fast_state(data, FAILURE);
1341 return;
1342 }
1343
1344 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1345 "received");
1346 if (data->final_result) {
1347 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1348 "completed successfully");
1349 }
1350
1351 if (data->anon_provisioning &&
1352 sm->cfg->eap_fast_prov != ANON_PROV &&
1353 sm->cfg->eap_fast_prov != BOTH_PROV) {
1354 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1355 "use unauthenticated provisioning which is "
1356 "disabled");
1357 eap_fast_state(data, FAILURE);
1358 return;
1359 }
1360
1361 if (sm->cfg->eap_fast_prov != AUTH_PROV &&
1362 sm->cfg->eap_fast_prov != BOTH_PROV &&
1363 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1364 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1365 PAC_TYPE_TUNNEL_PAC)) {
1366 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1367 "use authenticated provisioning which is "
1368 "disabled");
1369 eap_fast_state(data, FAILURE);
1370 return;
1371 }
1372
1373 if (data->anon_provisioning ||
1374 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1375 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1376 PAC_TYPE_TUNNEL_PAC))) {
1377 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1378 "Tunnel PAC");
1379 eap_fast_state(data, REQUEST_PAC);
1380 } else if (data->send_new_pac) {
1381 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1382 "re-keying of Tunnel PAC");
1383 eap_fast_state(data, REQUEST_PAC);
1384 } else if (data->final_result)
1385 eap_fast_state(data, SUCCESS);
1386 }
1387
1388 if (tlv.eap_payload_tlv) {
1389 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1390 tlv.eap_payload_tlv_len);
1391 }
1392 }
1393
1394
eap_fast_process_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_buf)1395 static void eap_fast_process_phase2(struct eap_sm *sm,
1396 struct eap_fast_data *data,
1397 struct wpabuf *in_buf)
1398 {
1399 struct wpabuf *in_decrypted;
1400
1401 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1402 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1403
1404 if (data->pending_phase2_resp) {
1405 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1406 "skip decryption and use old data");
1407 eap_fast_process_phase2_tlvs(sm, data,
1408 data->pending_phase2_resp);
1409 wpabuf_free(data->pending_phase2_resp);
1410 data->pending_phase2_resp = NULL;
1411 return;
1412 }
1413
1414 in_decrypted = tls_connection_decrypt(sm->cfg->ssl_ctx, data->ssl.conn,
1415 in_buf);
1416 if (in_decrypted == NULL) {
1417 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1418 "data");
1419 eap_fast_state(data, FAILURE);
1420 return;
1421 }
1422
1423 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1424 in_decrypted);
1425
1426 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1427
1428 if (sm->method_pending == METHOD_PENDING_WAIT) {
1429 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1430 "pending wait state - save decrypted response");
1431 wpabuf_free(data->pending_phase2_resp);
1432 data->pending_phase2_resp = in_decrypted;
1433 return;
1434 }
1435
1436 wpabuf_free(in_decrypted);
1437 }
1438
1439
eap_fast_process_version(struct eap_sm * sm,void * priv,int peer_version)1440 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1441 int peer_version)
1442 {
1443 struct eap_fast_data *data = priv;
1444
1445 data->peer_version = peer_version;
1446
1447 if (data->force_version >= 0 && peer_version != data->force_version) {
1448 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1449 " version (forced=%d peer=%d) - reject",
1450 data->force_version, peer_version);
1451 return -1;
1452 }
1453
1454 if (peer_version < data->fast_version) {
1455 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1456 "use version %d",
1457 peer_version, data->fast_version, peer_version);
1458 data->fast_version = peer_version;
1459 }
1460
1461 return 0;
1462 }
1463
1464
eap_fast_process_phase1(struct eap_sm * sm,struct eap_fast_data * data)1465 static int eap_fast_process_phase1(struct eap_sm *sm,
1466 struct eap_fast_data *data)
1467 {
1468 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1469 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1470 eap_fast_state(data, FAILURE);
1471 return -1;
1472 }
1473
1474 if (!tls_connection_established(sm->cfg->ssl_ctx, data->ssl.conn) ||
1475 wpabuf_len(data->ssl.tls_out) > 0)
1476 return 1;
1477
1478 /*
1479 * Phase 1 was completed with the received message (e.g., when using
1480 * abbreviated handshake), so Phase 2 can be started immediately
1481 * without having to send through an empty message to the peer.
1482 */
1483
1484 return eap_fast_phase1_done(sm, data);
1485 }
1486
1487
eap_fast_process_phase2_start(struct eap_sm * sm,struct eap_fast_data * data)1488 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1489 struct eap_fast_data *data)
1490 {
1491 int next_vendor;
1492 enum eap_type next_type;
1493
1494 if (data->identity) {
1495 os_free(sm->identity);
1496 sm->identity = data->identity;
1497 data->identity = NULL;
1498 sm->identity_len = data->identity_len;
1499 data->identity_len = 0;
1500 sm->require_identity_match = 1;
1501 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1502 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1503 "Phase2 Identity not found "
1504 "in the user database",
1505 sm->identity, sm->identity_len);
1506 next_vendor = EAP_VENDOR_IETF;
1507 next_type = eap_fast_req_failure(sm, data);
1508 } else {
1509 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1510 "known - skip Phase 2 Identity Request");
1511 next_vendor = sm->user->methods[0].vendor;
1512 next_type = sm->user->methods[0].method;
1513 sm->user_eap_method_index = 1;
1514 }
1515
1516 eap_fast_state(data, PHASE2_METHOD);
1517 } else {
1518 eap_fast_state(data, PHASE2_ID);
1519 next_vendor = EAP_VENDOR_IETF;
1520 next_type = EAP_TYPE_IDENTITY;
1521 }
1522
1523 return eap_fast_phase2_init(sm, data, next_vendor, next_type);
1524 }
1525
1526
eap_fast_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1527 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1528 const struct wpabuf *respData)
1529 {
1530 struct eap_fast_data *data = priv;
1531
1532 switch (data->state) {
1533 case PHASE1:
1534 if (eap_fast_process_phase1(sm, data))
1535 break;
1536
1537 /* fall through */
1538 case PHASE2_START:
1539 eap_fast_process_phase2_start(sm, data);
1540 break;
1541 case PHASE2_ID:
1542 case PHASE2_METHOD:
1543 case CRYPTO_BINDING:
1544 case REQUEST_PAC:
1545 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1546 break;
1547 default:
1548 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1549 data->state, __func__);
1550 break;
1551 }
1552 }
1553
1554
eap_fast_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1555 static void eap_fast_process(struct eap_sm *sm, void *priv,
1556 struct wpabuf *respData)
1557 {
1558 struct eap_fast_data *data = priv;
1559 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1560 EAP_TYPE_FAST, eap_fast_process_version,
1561 eap_fast_process_msg) < 0)
1562 eap_fast_state(data, FAILURE);
1563 }
1564
1565
eap_fast_isDone(struct eap_sm * sm,void * priv)1566 static bool eap_fast_isDone(struct eap_sm *sm, void *priv)
1567 {
1568 struct eap_fast_data *data = priv;
1569 return data->state == SUCCESS || data->state == FAILURE;
1570 }
1571
1572
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1573 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1574 {
1575 struct eap_fast_data *data = priv;
1576 u8 *eapKeyData;
1577
1578 if (data->state != SUCCESS)
1579 return NULL;
1580
1581 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1582 if (eapKeyData == NULL)
1583 return NULL;
1584
1585 if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) {
1586 os_free(eapKeyData);
1587 return NULL;
1588 }
1589 *len = EAP_FAST_KEY_LEN;
1590
1591 return eapKeyData;
1592 }
1593
1594
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1595 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1596 {
1597 struct eap_fast_data *data = priv;
1598 u8 *eapKeyData;
1599
1600 if (data->state != SUCCESS)
1601 return NULL;
1602
1603 eapKeyData = os_malloc(EAP_EMSK_LEN);
1604 if (eapKeyData == NULL)
1605 return NULL;
1606
1607 if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) {
1608 os_free(eapKeyData);
1609 return NULL;
1610 }
1611 *len = EAP_EMSK_LEN;
1612
1613 return eapKeyData;
1614 }
1615
1616
eap_fast_isSuccess(struct eap_sm * sm,void * priv)1617 static bool eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1618 {
1619 struct eap_fast_data *data = priv;
1620 return data->state == SUCCESS;
1621 }
1622
1623
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1624 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1625 {
1626 struct eap_fast_data *data = priv;
1627
1628 if (data->state != SUCCESS)
1629 return NULL;
1630
1631 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1632 len);
1633 }
1634
1635
eap_server_fast_register(void)1636 int eap_server_fast_register(void)
1637 {
1638 struct eap_method *eap;
1639
1640 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1641 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1642 if (eap == NULL)
1643 return -1;
1644
1645 eap->init = eap_fast_init;
1646 eap->reset = eap_fast_reset;
1647 eap->buildReq = eap_fast_buildReq;
1648 eap->check = eap_fast_check;
1649 eap->process = eap_fast_process;
1650 eap->isDone = eap_fast_isDone;
1651 eap->getKey = eap_fast_getKey;
1652 eap->get_emsk = eap_fast_get_emsk;
1653 eap->isSuccess = eap_fast_isSuccess;
1654 eap->getSessionId = eap_fast_get_session_id;
1655
1656 return eap_server_method_register(eap);
1657 }
1658
