?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Share a single Linux ioctl helper fo setting interface up/down
[hostap-gosc2009.git] / src / eap_server / eap_fast.c
blob74bef17ea9fed5df966687a153a888959e2a6658
1 /*
2 * EAP-FAST server (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "crypto/aes_wrap.h"
19 #include "crypto/sha1.h"
20 #include "crypto/tls.h"
21 #include "eap_common/eap_tlv_common.h"
22 #include "eap_common/eap_fast_common.h"
23 #include "eap_i.h"
24 #include "eap_tls_common.h"
25
26
27 static void eap_fast_reset(struct eap_sm *sm, void *priv);
28
29
30 /* Private PAC-Opaque TLV types */
31 #define PAC_OPAQUE_TYPE_PAD 0
32 #define PAC_OPAQUE_TYPE_KEY 1
33 #define PAC_OPAQUE_TYPE_LIFETIME 2
34 #define PAC_OPAQUE_TYPE_IDENTITY 3
35
36 struct eap_fast_data {
37 struct eap_ssl_data ssl;
38 enum {
39 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
40 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
41 } state;
42
43 int fast_version;
44 const struct eap_method *phase2_method;
45 void *phase2_priv;
46 int force_version;
47 int peer_version;
48
49 u8 crypto_binding_nonce[32];
50 int final_result;
51
52 struct eap_fast_key_block_provisioning *key_block_p;
53
54 u8 simck[EAP_FAST_SIMCK_LEN];
55 u8 cmk[EAP_FAST_CMK_LEN];
56 int simck_idx;
57
58 u8 pac_opaque_encr[16];
59 u8 *srv_id;
60 size_t srv_id_len;
61 char *srv_id_info;
62
63 int anon_provisioning;
64 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
65 struct wpabuf *pending_phase2_resp;
66 u8 *identity; /* from PAC-Opaque */
67 size_t identity_len;
68 int eap_seq;
69 int tnc_started;
70
71 int pac_key_lifetime;
72 int pac_key_refresh_time;
73 };
74
75
76 static int eap_fast_process_phase2_start(struct eap_sm *sm,
77 struct eap_fast_data *data);
78
79
80 static const char * eap_fast_state_txt(int state)
81 {
82 switch (state) {
83 case START:
84 return "START";
85 case PHASE1:
86 return "PHASE1";
87 case PHASE2_START:
88 return "PHASE2_START";
89 case PHASE2_ID:
90 return "PHASE2_ID";
91 case PHASE2_METHOD:
92 return "PHASE2_METHOD";
93 case CRYPTO_BINDING:
94 return "CRYPTO_BINDING";
95 case REQUEST_PAC:
96 return "REQUEST_PAC";
97 case SUCCESS:
98 return "SUCCESS";
99 case FAILURE:
100 return "FAILURE";
101 default:
102 return "Unknown?!";
103 }
104 }
105
106
107 static void eap_fast_state(struct eap_fast_data *data, int state)
108 {
109 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
110 eap_fast_state_txt(data->state),
111 eap_fast_state_txt(state));
112 data->state = state;
113 }
114
115
116 static EapType eap_fast_req_failure(struct eap_sm *sm,
117 struct eap_fast_data *data)
118 {
119 /* TODO: send Result TLV(FAILURE) */
120 eap_fast_state(data, FAILURE);
121 return EAP_TYPE_NONE;
122 }
123
124
125 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
126 const u8 *client_random,
127 const u8 *server_random,
128 u8 *master_secret)
129 {
130 struct eap_fast_data *data = ctx;
131 const u8 *pac_opaque;
132 size_t pac_opaque_len;
133 u8 *buf, *pos, *end, *pac_key = NULL;
134 os_time_t lifetime = 0;
135 struct os_time now;
136 u8 *identity = NULL;
137 size_t identity_len = 0;
138
139 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
140 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
141 ticket, len);
142
143 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
144 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
145 "SessionTicket");
146 return 0;
147 }
148
149 pac_opaque_len = WPA_GET_BE16(ticket + 2);
150 pac_opaque = ticket + 4;
151 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
152 pac_opaque_len > len - 4) {
153 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
154 "(len=%lu left=%lu)",
155 (unsigned long) pac_opaque_len,
156 (unsigned long) len);
157 return 0;
158 }
159 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
160 pac_opaque, pac_opaque_len);
161
162 buf = os_malloc(pac_opaque_len - 8);
163 if (buf == NULL) {
164 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
165 "for decrypting PAC-Opaque");
166 return 0;
167 }
168
169 if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
170 pac_opaque, buf) < 0) {
171 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
172 "PAC-Opaque");
173 os_free(buf);
174 /*
175 * This may have been caused by server changing the PAC-Opaque
176 * encryption key, so just ignore this PAC-Opaque instead of
177 * failing the authentication completely. Provisioning can now
178 * be used to provision a new PAC.
179 */
180 return 0;
181 }
182
183 end = buf + pac_opaque_len - 8;
184 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
185 buf, end - buf);
186
187 pos = buf;
188 while (pos + 1 < end) {
189 if (pos + 2 + pos[1] > end)
190 break;
191
192 switch (*pos) {
193 case PAC_OPAQUE_TYPE_PAD:
194 pos = end;
195 break;
196 case PAC_OPAQUE_TYPE_KEY:
197 if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
198 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
199 "PAC-Key length %d", pos[1]);
200 os_free(buf);
201 return -1;
202 }
203 pac_key = pos + 2;
204 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
205 "decrypted PAC-Opaque",
206 pac_key, EAP_FAST_PAC_KEY_LEN);
207 break;
208 case PAC_OPAQUE_TYPE_LIFETIME:
209 if (pos[1] != 4) {
210 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
211 "PAC-Key lifetime length %d",
212 pos[1]);
213 os_free(buf);
214 return -1;
215 }
216 lifetime = WPA_GET_BE32(pos + 2);
217 break;
218 case PAC_OPAQUE_TYPE_IDENTITY:
219 identity = pos + 2;
220 identity_len = pos[1];
221 break;
222 }
223
224 pos += 2 + pos[1];
225 }
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
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->ssl_ctx, data->ssl.conn, "key expansion",
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
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->ssl_ctx, data->ssl.conn,
308 "key expansion",
309 sizeof(*data->key_block_p));
310 if (data->key_block_p == NULL) {
311 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
312 return;
313 }
314 /*
315 * RFC 4851, Section 5.2:
316 * S-IMCK[0] = session_key_seed
317 */
318 wpa_hexdump_key(MSG_DEBUG,
319 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
320 data->key_block_p->session_key_seed,
321 sizeof(data->key_block_p->session_key_seed));
322 data->simck_idx = 0;
323 os_memcpy(data->simck, data->key_block_p->session_key_seed,
324 EAP_FAST_SIMCK_LEN);
325 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
326 data->key_block_p->server_challenge,
327 sizeof(data->key_block_p->server_challenge));
328 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
329 data->key_block_p->client_challenge,
330 sizeof(data->key_block_p->client_challenge));
331 }
332
333
334 static int eap_fast_get_phase2_key(struct eap_sm *sm,
335 struct eap_fast_data *data,
336 u8 *isk, size_t isk_len)
337 {
338 u8 *key;
339 size_t key_len;
340
341 os_memset(isk, 0, isk_len);
342
343 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
344 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
345 "available");
346 return -1;
347 }
348
349 if (data->phase2_method->getKey == NULL)
350 return 0;
351
352 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
353 &key_len)) == NULL) {
354 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
355 "from Phase 2");
356 return -1;
357 }
358
359 if (key_len > isk_len)
360 key_len = isk_len;
361 if (key_len == 32 &&
362 data->phase2_method->vendor == EAP_VENDOR_IETF &&
363 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
364 /*
365 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
366 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
367 * ISK for EAP-FAST cryptobinding.
368 */
369 os_memcpy(isk, key + 16, 16);
370 os_memcpy(isk + 16, key, 16);
371 } else
372 os_memcpy(isk, key, key_len);
373 os_free(key);
374
375 return 0;
376 }
377
378
379 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
380 {
381 u8 isk[32], imck[60];
382
383 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
384 data->simck_idx + 1);
385
386 /*
387 * RFC 4851, Section 5.2:
388 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
389 * MSK[j], 60)
390 * S-IMCK[j] = first 40 octets of IMCK[j]
391 * CMK[j] = last 20 octets of IMCK[j]
392 */
393
394 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
395 return -1;
396 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
397 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
398 "Inner Methods Compound Keys",
399 isk, sizeof(isk), imck, sizeof(imck));
400 data->simck_idx++;
401 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
402 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
403 data->simck, EAP_FAST_SIMCK_LEN);
404 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
405 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
406 data->cmk, EAP_FAST_CMK_LEN);
407
408 return 0;
409 }
410
411
412 static void * eap_fast_init(struct eap_sm *sm)
413 {
414 struct eap_fast_data *data;
415 u8 ciphers[5] = {
416 TLS_CIPHER_ANON_DH_AES128_SHA,
417 TLS_CIPHER_AES128_SHA,
418 TLS_CIPHER_RSA_DHE_AES128_SHA,
419 TLS_CIPHER_RC4_SHA,
420 TLS_CIPHER_NONE
421 };
422
423 data = os_zalloc(sizeof(*data));
424 if (data == NULL)
425 return NULL;
426 data->fast_version = EAP_FAST_VERSION;
427 data->force_version = -1;
428 if (sm->user && sm->user->force_version >= 0) {
429 data->force_version = sm->user->force_version;
430 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
431 data->force_version);
432 data->fast_version = data->force_version;
433 }
434 data->state = START;
435
436 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
437 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
438 eap_fast_reset(sm, data);
439 return NULL;
440 }
441
442 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
443 ciphers) < 0) {
444 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
445 "suites");
446 eap_fast_reset(sm, data);
447 return NULL;
448 }
449
450 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
451 eap_fast_session_ticket_cb,
452 data) < 0) {
453 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
454 "callback");
455 eap_fast_reset(sm, data);
456 return NULL;
457 }
458
459 if (sm->pac_opaque_encr_key == NULL) {
460 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
461 "configured");
462 eap_fast_reset(sm, data);
463 return NULL;
464 }
465 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
466 sizeof(data->pac_opaque_encr));
467
468 if (sm->eap_fast_a_id == NULL) {
469 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
470 eap_fast_reset(sm, data);
471 return NULL;
472 }
473 data->srv_id = os_malloc(sm->eap_fast_a_id_len);
474 if (data->srv_id == NULL) {
475 eap_fast_reset(sm, data);
476 return NULL;
477 }
478 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
479 data->srv_id_len = sm->eap_fast_a_id_len;
480
481 if (sm->eap_fast_a_id_info == NULL) {
482 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
483 eap_fast_reset(sm, data);
484 return NULL;
485 }
486 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
487 if (data->srv_id_info == NULL) {
488 eap_fast_reset(sm, data);
489 return NULL;
490 }
491
492 /* PAC-Key lifetime in seconds (hard limit) */
493 data->pac_key_lifetime = sm->pac_key_lifetime;
494
495 /*
496 * PAC-Key refresh time in seconds (soft limit on remaining hard
497 * limit). The server will generate a new PAC-Key when this number of
498 * seconds (or fewer) of the lifetime remains.
499 */
500 data->pac_key_refresh_time = sm->pac_key_refresh_time;
501
502 return data;
503 }
504
505
506 static void eap_fast_reset(struct eap_sm *sm, void *priv)
507 {
508 struct eap_fast_data *data = priv;
509 if (data == NULL)
510 return;
511 if (data->phase2_priv && data->phase2_method)
512 data->phase2_method->reset(sm, data->phase2_priv);
513 eap_server_tls_ssl_deinit(sm, &data->ssl);
514 os_free(data->srv_id);
515 os_free(data->srv_id_info);
516 os_free(data->key_block_p);
517 wpabuf_free(data->pending_phase2_resp);
518 os_free(data->identity);
519 os_free(data);
520 }
521
522
523 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
524 struct eap_fast_data *data, u8 id)
525 {
526 struct wpabuf *req;
527
528 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
529 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
530 EAP_CODE_REQUEST, id);
531 if (req == NULL) {
532 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
533 " request");
534 eap_fast_state(data, FAILURE);
535 return NULL;
536 }
537
538 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
539
540 /* RFC 4851, 4.1.1. Authority ID Data */
541 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
542
543 eap_fast_state(data, PHASE1);
544
545 return req;
546 }
547
548
549 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
550 {
551 char cipher[64];
552
553 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
554
555 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
556 < 0) {
557 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
558 "information");
559 eap_fast_state(data, FAILURE);
560 return -1;
561 }
562 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
563
564 if (data->anon_provisioning) {
565 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
566 eap_fast_derive_key_provisioning(sm, data);
567 } else
568 eap_fast_derive_key_auth(sm, data);
569
570 eap_fast_state(data, PHASE2_START);
571
572 return 0;
573 }
574
575
576 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
577 struct eap_fast_data *data,
578 u8 id)
579 {
580 struct wpabuf *req;
581
582 if (data->phase2_priv == NULL) {
583 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
584 "initialized");
585 return NULL;
586 }
587 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
588 if (req == NULL)
589 return NULL;
590
591 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
592 return eap_fast_tlv_eap_payload(req);
593 }
594
595
596 static struct wpabuf * eap_fast_build_crypto_binding(
597 struct eap_sm *sm, struct eap_fast_data *data)
598 {
599 struct wpabuf *buf;
600 struct eap_tlv_result_tlv *result;
601 struct eap_tlv_crypto_binding_tlv *binding;
602
603 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
604 if (buf == NULL)
605 return NULL;
606
607 if (data->send_new_pac || data->anon_provisioning ||
608 data->phase2_method)
609 data->final_result = 0;
610 else
611 data->final_result = 1;
612
613 if (!data->final_result || data->eap_seq > 1) {
614 /* Intermediate-Result */
615 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
616 "(status=SUCCESS)");
617 result = wpabuf_put(buf, sizeof(*result));
618 result->tlv_type = host_to_be16(
619 EAP_TLV_TYPE_MANDATORY |
620 EAP_TLV_INTERMEDIATE_RESULT_TLV);
621 result->length = host_to_be16(2);
622 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
623 }
624
625 if (data->final_result) {
626 /* Result TLV */
627 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
628 "(status=SUCCESS)");
629 result = wpabuf_put(buf, sizeof(*result));
630 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
631 EAP_TLV_RESULT_TLV);
632 result->length = host_to_be16(2);
633 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
634 }
635
636 /* Crypto-Binding TLV */
637 binding = wpabuf_put(buf, sizeof(*binding));
638 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
639 EAP_TLV_CRYPTO_BINDING_TLV);
640 binding->length = host_to_be16(sizeof(*binding) -
641 sizeof(struct eap_tlv_hdr));
642 binding->version = EAP_FAST_VERSION;
643 binding->received_version = data->peer_version;
644 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
645 if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
646 wpabuf_free(buf);
647 return NULL;
648 }
649
650 /*
651 * RFC 4851, Section 4.2.8:
652 * The nonce in a request MUST have its least significant bit set to 0.
653 */
654 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
655
656 os_memcpy(data->crypto_binding_nonce, binding->nonce,
657 sizeof(binding->nonce));
658
659 /*
660 * RFC 4851, Section 5.3:
661 * CMK = CMK[j]
662 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
663 */
664
665 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
666 (u8 *) binding, sizeof(*binding),
667 binding->compound_mac);
668
669 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
670 "Received Version %d SubType %d",
671 binding->version, binding->received_version,
672 binding->subtype);
673 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
674 binding->nonce, sizeof(binding->nonce));
675 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
676 binding->compound_mac, sizeof(binding->compound_mac));
677
678 return buf;
679 }
680
681
682 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
683 struct eap_fast_data *data)
684 {
685 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
686 u8 *pac_buf, *pac_opaque;
687 struct wpabuf *buf;
688 u8 *pos;
689 size_t buf_len, srv_id_info_len, pac_len;
690 struct eap_tlv_hdr *pac_tlv;
691 struct pac_tlv_hdr *pac_info;
692 struct eap_tlv_result_tlv *result;
693 struct os_time now;
694
695 if (os_get_random(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
696 os_get_time(&now) < 0)
697 return NULL;
698 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
699 pac_key, EAP_FAST_PAC_KEY_LEN);
700
701 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
702 (2 + sm->identity_len) + 8;
703 pac_buf = os_malloc(pac_len);
704 if (pac_buf == NULL)
705 return NULL;
706
707 srv_id_info_len = os_strlen(data->srv_id_info);
708
709 pos = pac_buf;
710 *pos++ = PAC_OPAQUE_TYPE_KEY;
711 *pos++ = EAP_FAST_PAC_KEY_LEN;
712 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
713 pos += EAP_FAST_PAC_KEY_LEN;
714
715 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
716 *pos++ = 4;
717 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
718 pos += 4;
719
720 if (sm->identity) {
721 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
722 *pos++ = sm->identity_len;
723 os_memcpy(pos, sm->identity, sm->identity_len);
724 pos += sm->identity_len;
725 }
726
727 pac_len = pos - pac_buf;
728 while (pac_len % 8) {
729 *pos++ = PAC_OPAQUE_TYPE_PAD;
730 pac_len++;
731 }
732
733 pac_opaque = os_malloc(pac_len + 8);
734 if (pac_opaque == NULL) {
735 os_free(pac_buf);
736 return NULL;
737 }
738 if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
739 pac_opaque) < 0) {
740 os_free(pac_buf);
741 os_free(pac_opaque);
742 return NULL;
743 }
744 os_free(pac_buf);
745
746 pac_len += 8;
747 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
748 pac_opaque, pac_len);
749
750 buf_len = sizeof(*pac_tlv) +
751 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
752 sizeof(struct pac_tlv_hdr) + pac_len +
753 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
754 buf = wpabuf_alloc(buf_len);
755 if (buf == NULL) {
756 os_free(pac_opaque);
757 return NULL;
758 }
759
760 /* Result TLV */
761 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
762 result = wpabuf_put(buf, sizeof(*result));
763 WPA_PUT_BE16((u8 *) &result->tlv_type,
764 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
765 WPA_PUT_BE16((u8 *) &result->length, 2);
766 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
767
768 /* PAC TLV */
769 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
770 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
771 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
772 EAP_TLV_PAC_TLV);
773
774 /* PAC-Key */
775 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
776
777 /* PAC-Opaque */
778 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
779 os_free(pac_opaque);
780
781 /* PAC-Info */
782 pac_info = wpabuf_put(buf, sizeof(*pac_info));
783 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
784
785 /* PAC-Lifetime (inside PAC-Info) */
786 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
787 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
788
789 /* A-ID (inside PAC-Info) */
790 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
791
792 /* Note: headers may be misaligned after A-ID */
793
794 /* A-ID-Info (inside PAC-Info) */
795 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
796 srv_id_info_len);
797
798 /* PAC-Type (inside PAC-Info) */
799 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
800 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
801
802 /* Update PAC-Info and PAC TLV Length fields */
803 pos = wpabuf_put(buf, 0);
804 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
805 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
806
807 return buf;
808 }
809
810
811 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
812 struct eap_fast_data *data,
813 struct wpabuf *plain, int piggyback)
814 {
815 struct wpabuf *encr;
816
817 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
818 plain);
819 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
820 wpabuf_free(plain);
821
822 if (data->ssl.tls_out && piggyback) {
823 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
824 "(len=%d) with last Phase 1 Message (len=%d "
825 "used=%d)",
826 (int) wpabuf_len(encr),
827 (int) wpabuf_len(data->ssl.tls_out),
828 (int) data->ssl.tls_out_pos);
829 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
830 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
831 "output buffer");
832 wpabuf_free(encr);
833 return -1;
834 }
835 wpabuf_put_buf(data->ssl.tls_out, encr);
836 wpabuf_free(encr);
837 } else {
838 wpabuf_free(data->ssl.tls_out);
839 data->ssl.tls_out_pos = 0;
840 data->ssl.tls_out = encr;
841 }
842
843 return 0;
844 }
845
846
847 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
848 {
849 struct eap_fast_data *data = priv;
850 struct wpabuf *req = NULL;
851 int piggyback = 0;
852
853 if (data->ssl.state == FRAG_ACK) {
854 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
855 data->fast_version);
856 }
857
858 if (data->ssl.state == WAIT_FRAG_ACK) {
859 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
860 data->fast_version, id);
861 }
862
863 switch (data->state) {
864 case START:
865 return eap_fast_build_start(sm, data, id);
866 case PHASE1:
867 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
868 if (eap_fast_phase1_done(sm, data) < 0)
869 return NULL;
870 if (data->state == PHASE2_START) {
871 /*
872 * Try to generate Phase 2 data to piggyback
873 * with the end of Phase 1 to avoid extra
874 * roundtrip.
875 */
876 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
877 "Phase 2");
878 if (eap_fast_process_phase2_start(sm, data))
879 break;
880 req = eap_fast_build_phase2_req(sm, data, id);
881 piggyback = 1;
882 }
883 }
884 break;
885 case PHASE2_ID:
886 case PHASE2_METHOD:
887 req = eap_fast_build_phase2_req(sm, data, id);
888 break;
889 case CRYPTO_BINDING:
890 req = eap_fast_build_crypto_binding(sm, data);
891 if (data->phase2_method) {
892 /*
893 * Include the start of the next EAP method in the
894 * sequence in the same message with Crypto-Binding to
895 * save a round-trip.
896 */
897 struct wpabuf *eap;
898 eap = eap_fast_build_phase2_req(sm, data, id);
899 req = wpabuf_concat(req, eap);
900 eap_fast_state(data, PHASE2_METHOD);
901 }
902 break;
903 case REQUEST_PAC:
904 req = eap_fast_build_pac(sm, data);
905 break;
906 default:
907 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
908 __func__, data->state);
909 return NULL;
910 }
911
912 if (req &&
913 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
914 return NULL;
915
916 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
917 data->fast_version, id);
918 }
919
920
921 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
922 struct wpabuf *respData)
923 {
924 const u8 *pos;
925 size_t len;
926
927 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
928 if (pos == NULL || len < 1) {
929 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
930 return TRUE;
931 }
932
933 return FALSE;
934 }
935
936
937 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
938 EapType eap_type)
939 {
940 if (data->phase2_priv && data->phase2_method) {
941 data->phase2_method->reset(sm, data->phase2_priv);
942 data->phase2_method = NULL;
943 data->phase2_priv = NULL;
944 }
945 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
946 eap_type);
947 if (!data->phase2_method)
948 return -1;
949
950 if (data->key_block_p) {
951 sm->auth_challenge = data->key_block_p->server_challenge;
952 sm->peer_challenge = data->key_block_p->client_challenge;
953 }
954 sm->init_phase2 = 1;
955 data->phase2_priv = data->phase2_method->init(sm);
956 sm->init_phase2 = 0;
957 sm->auth_challenge = NULL;
958 sm->peer_challenge = NULL;
959
960 return data->phase2_priv == NULL ? -1 : 0;
961 }
962
963
964 static void eap_fast_process_phase2_response(struct eap_sm *sm,
965 struct eap_fast_data *data,
966 u8 *in_data, size_t in_len)
967 {
968 u8 next_type = EAP_TYPE_NONE;
969 struct eap_hdr *hdr;
970 u8 *pos;
971 size_t left;
972 struct wpabuf buf;
973 const struct eap_method *m = data->phase2_method;
974 void *priv = data->phase2_priv;
975
976 if (priv == NULL) {
977 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
978 "initialized?!", __func__);
979 return;
980 }
981
982 hdr = (struct eap_hdr *) in_data;
983 pos = (u8 *) (hdr + 1);
984
985 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
986 left = in_len - sizeof(*hdr);
987 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
988 "allowed types", pos + 1, left - 1);
989 #ifdef EAP_SERVER_TNC
990 if (m && m->vendor == EAP_VENDOR_IETF &&
991 m->method == EAP_TYPE_TNC) {
992 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
993 "TNC negotiation");
994 next_type = eap_fast_req_failure(sm, data);
995 eap_fast_phase2_init(sm, data, next_type);
996 return;
997 }
998 #endif /* EAP_SERVER_TNC */
999 eap_sm_process_nak(sm, pos + 1, left - 1);
1000 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1001 sm->user->methods[sm->user_eap_method_index].method !=
1002 EAP_TYPE_NONE) {
1003 next_type = sm->user->methods[
1004 sm->user_eap_method_index++].method;
1005 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1006 next_type);
1007 } else {
1008 next_type = eap_fast_req_failure(sm, data);
1009 }
1010 eap_fast_phase2_init(sm, data, next_type);
1011 return;
1012 }
1013
1014 wpabuf_set(&buf, in_data, in_len);
1015
1016 if (m->check(sm, priv, &buf)) {
1017 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1018 "ignore the packet");
1019 next_type = eap_fast_req_failure(sm, data);
1020 return;
1021 }
1022
1023 m->process(sm, priv, &buf);
1024
1025 if (!m->isDone(sm, priv))
1026 return;
1027
1028 if (!m->isSuccess(sm, priv)) {
1029 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1030 next_type = eap_fast_req_failure(sm, data);
1031 eap_fast_phase2_init(sm, data, next_type);
1032 return;
1033 }
1034
1035 switch (data->state) {
1036 case PHASE2_ID:
1037 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1038 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1039 "Identity not found in the user "
1040 "database",
1041 sm->identity, sm->identity_len);
1042 next_type = eap_fast_req_failure(sm, data);
1043 break;
1044 }
1045
1046 eap_fast_state(data, PHASE2_METHOD);
1047 if (data->anon_provisioning) {
1048 /*
1049 * Only EAP-MSCHAPv2 is allowed for anonymous
1050 * provisioning.
1051 */
1052 next_type = EAP_TYPE_MSCHAPV2;
1053 sm->user_eap_method_index = 0;
1054 } else {
1055 next_type = sm->user->methods[0].method;
1056 sm->user_eap_method_index = 1;
1057 }
1058 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1059 break;
1060 case PHASE2_METHOD:
1061 case CRYPTO_BINDING:
1062 eap_fast_update_icmk(sm, data);
1063 eap_fast_state(data, CRYPTO_BINDING);
1064 data->eap_seq++;
1065 next_type = EAP_TYPE_NONE;
1066 #ifdef EAP_SERVER_TNC
1067 if (sm->tnc && !data->tnc_started) {
1068 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1069 next_type = EAP_TYPE_TNC;
1070 data->tnc_started = 1;
1071 }
1072 #endif /* EAP_SERVER_TNC */
1073 break;
1074 case FAILURE:
1075 break;
1076 default:
1077 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1078 __func__, data->state);
1079 break;
1080 }
1081
1082 eap_fast_phase2_init(sm, data, next_type);
1083 }
1084
1085
1086 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1087 struct eap_fast_data *data,
1088 u8 *in_data, size_t in_len)
1089 {
1090 struct eap_hdr *hdr;
1091 size_t len;
1092
1093 hdr = (struct eap_hdr *) in_data;
1094 if (in_len < (int) sizeof(*hdr)) {
1095 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1096 "EAP frame (len=%lu)", (unsigned long) in_len);
1097 eap_fast_req_failure(sm, data);
1098 return;
1099 }
1100 len = be_to_host16(hdr->length);
1101 if (len > in_len) {
1102 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1103 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1104 (unsigned long) in_len, (unsigned long) len);
1105 eap_fast_req_failure(sm, data);
1106 return;
1107 }
1108 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1109 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1110 (unsigned long) len);
1111 switch (hdr->code) {
1112 case EAP_CODE_RESPONSE:
1113 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1114 break;
1115 default:
1116 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1117 "Phase 2 EAP header", hdr->code);
1118 break;
1119 }
1120 }
1121
1122
1123 static int eap_fast_parse_tlvs(struct wpabuf *data,
1124 struct eap_fast_tlv_parse *tlv)
1125 {
1126 int mandatory, tlv_type, len, res;
1127 u8 *pos, *end;
1128
1129 os_memset(tlv, 0, sizeof(*tlv));
1130
1131 pos = wpabuf_mhead(data);
1132 end = pos + wpabuf_len(data);
1133 while (pos + 4 < end) {
1134 mandatory = pos[0] & 0x80;
1135 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1136 pos += 2;
1137 len = WPA_GET_BE16(pos);
1138 pos += 2;
1139 if (pos + len > end) {
1140 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1141 return -1;
1142 }
1143 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1144 "TLV type %d length %d%s",
1145 tlv_type, len, mandatory ? " (mandatory)" : "");
1146
1147 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1148 if (res == -2)
1149 break;
1150 if (res < 0) {
1151 if (mandatory) {
1152 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1153 "mandatory TLV type %d", tlv_type);
1154 /* TODO: generate Nak TLV */
1155 break;
1156 } else {
1157 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1158 "unknown optional TLV type %d",
1159 tlv_type);
1160 }
1161 }
1162
1163 pos += len;
1164 }
1165
1166 return 0;
1167 }
1168
1169
1170 static int eap_fast_validate_crypto_binding(
1171 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1172 size_t bind_len)
1173 {
1174 u8 cmac[SHA1_MAC_LEN];
1175
1176 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1177 "Version %d Received Version %d SubType %d",
1178 b->version, b->received_version, b->subtype);
1179 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1180 b->nonce, sizeof(b->nonce));
1181 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1182 b->compound_mac, sizeof(b->compound_mac));
1183
1184 if (b->version != EAP_FAST_VERSION ||
1185 b->received_version != EAP_FAST_VERSION) {
1186 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1187 "in Crypto-Binding: version %d "
1188 "received_version %d", b->version,
1189 b->received_version);
1190 return -1;
1191 }
1192
1193 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1194 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1195 "Crypto-Binding: %d", b->subtype);
1196 return -1;
1197 }
1198
1199 if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1200 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1201 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1202 "Crypto-Binding");
1203 return -1;
1204 }
1205
1206 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1207 os_memset(b->compound_mac, 0, sizeof(cmac));
1208 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1209 "Compound MAC calculation",
1210 (u8 *) b, bind_len);
1211 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1212 b->compound_mac);
1213 if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1214 wpa_hexdump(MSG_MSGDUMP,
1215 "EAP-FAST: Calculated Compound MAC",
1216 b->compound_mac, sizeof(cmac));
1217 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1218 "match");
1219 return -1;
1220 }
1221
1222 return 0;
1223 }
1224
1225
1226 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1227 {
1228 struct eap_tlv_pac_type_tlv *tlv;
1229
1230 if (pac == NULL || len != sizeof(*tlv))
1231 return 0;
1232
1233 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1234
1235 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1236 be_to_host16(tlv->length) == 2 &&
1237 be_to_host16(tlv->pac_type) == type;
1238 }
1239
1240
1241 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1242 struct eap_fast_data *data,
1243 struct wpabuf *in_data)
1244 {
1245 struct eap_fast_tlv_parse tlv;
1246 int check_crypto_binding = data->state == CRYPTO_BINDING;
1247
1248 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1249 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1250 "Phase 2 TLVs");
1251 return;
1252 }
1253
1254 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1255 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1256 "failure");
1257 eap_fast_state(data, FAILURE);
1258 return;
1259 }
1260
1261 if (data->state == REQUEST_PAC) {
1262 u16 type, len, res;
1263 if (tlv.pac == NULL || tlv.pac_len < 6) {
1264 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1265 "Acknowledgement received");
1266 eap_fast_state(data, FAILURE);
1267 return;
1268 }
1269
1270 type = WPA_GET_BE16(tlv.pac);
1271 len = WPA_GET_BE16(tlv.pac + 2);
1272 res = WPA_GET_BE16(tlv.pac + 4);
1273
1274 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1275 res != EAP_TLV_RESULT_SUCCESS) {
1276 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1277 "contain acknowledgement");
1278 eap_fast_state(data, FAILURE);
1279 return;
1280 }
1281
1282 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1283 "- PAC provisioning succeeded");
1284 eap_fast_state(data, (data->anon_provisioning ||
1285 data->send_new_pac == 2) ?
1286 FAILURE : SUCCESS);
1287 return;
1288 }
1289
1290 if (check_crypto_binding) {
1291 if (tlv.crypto_binding == NULL) {
1292 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1293 "TLV received");
1294 eap_fast_state(data, FAILURE);
1295 return;
1296 }
1297
1298 if (data->final_result &&
1299 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1300 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1301 "without Success Result");
1302 eap_fast_state(data, FAILURE);
1303 return;
1304 }
1305
1306 if (!data->final_result &&
1307 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1308 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1309 "without intermediate Success Result");
1310 eap_fast_state(data, FAILURE);
1311 return;
1312 }
1313
1314 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1315 tlv.crypto_binding_len)) {
1316 eap_fast_state(data, FAILURE);
1317 return;
1318 }
1319
1320 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1321 "received");
1322 if (data->final_result) {
1323 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1324 "completed successfully");
1325 }
1326
1327 if (data->anon_provisioning &&
1328 sm->eap_fast_prov != ANON_PROV &&
1329 sm->eap_fast_prov != BOTH_PROV) {
1330 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1331 "use unauthenticated provisioning which is "
1332 "disabled");
1333 eap_fast_state(data, FAILURE);
1334 return;
1335 }
1336
1337 if (sm->eap_fast_prov != AUTH_PROV &&
1338 sm->eap_fast_prov != BOTH_PROV &&
1339 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1340 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1341 PAC_TYPE_TUNNEL_PAC)) {
1342 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1343 "use authenticated provisioning which is "
1344 "disabled");
1345 eap_fast_state(data, FAILURE);
1346 return;
1347 }
1348
1349 if (data->anon_provisioning ||
1350 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1351 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1352 PAC_TYPE_TUNNEL_PAC))) {
1353 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1354 "Tunnel PAC");
1355 eap_fast_state(data, REQUEST_PAC);
1356 } else if (data->send_new_pac) {
1357 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1358 "re-keying of Tunnel PAC");
1359 eap_fast_state(data, REQUEST_PAC);
1360 } else if (data->final_result)
1361 eap_fast_state(data, SUCCESS);
1362 }
1363
1364 if (tlv.eap_payload_tlv) {
1365 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1366 tlv.eap_payload_tlv_len);
1367 }
1368 }
1369
1370
1371 static void eap_fast_process_phase2(struct eap_sm *sm,
1372 struct eap_fast_data *data,
1373 struct wpabuf *in_buf)
1374 {
1375 struct wpabuf *in_decrypted;
1376
1377 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1378 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1379
1380 if (data->pending_phase2_resp) {
1381 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1382 "skip decryption and use old data");
1383 eap_fast_process_phase2_tlvs(sm, data,
1384 data->pending_phase2_resp);
1385 wpabuf_free(data->pending_phase2_resp);
1386 data->pending_phase2_resp = NULL;
1387 return;
1388 }
1389
1390 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1391 in_buf);
1392 if (in_decrypted == NULL) {
1393 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1394 "data");
1395 eap_fast_state(data, FAILURE);
1396 return;
1397 }
1398
1399 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1400 in_decrypted);
1401
1402 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1403
1404 if (sm->method_pending == METHOD_PENDING_WAIT) {
1405 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1406 "pending wait state - save decrypted response");
1407 wpabuf_free(data->pending_phase2_resp);
1408 data->pending_phase2_resp = in_decrypted;
1409 return;
1410 }
1411
1412 wpabuf_free(in_decrypted);
1413 }
1414
1415
1416 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1417 int peer_version)
1418 {
1419 struct eap_fast_data *data = priv;
1420
1421 data->peer_version = peer_version;
1422
1423 if (data->force_version >= 0 && peer_version != data->force_version) {
1424 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1425 " version (forced=%d peer=%d) - reject",
1426 data->force_version, peer_version);
1427 return -1;
1428 }
1429
1430 if (peer_version < data->fast_version) {
1431 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1432 "use version %d",
1433 peer_version, data->fast_version, peer_version);
1434 data->fast_version = peer_version;
1435 }
1436
1437 return 0;
1438 }
1439
1440
1441 static int eap_fast_process_phase1(struct eap_sm *sm,
1442 struct eap_fast_data *data)
1443 {
1444 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1445 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1446 eap_fast_state(data, FAILURE);
1447 return -1;
1448 }
1449
1450 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1451 wpabuf_len(data->ssl.tls_out) > 0)
1452 return 1;
1453
1454 /*
1455 * Phase 1 was completed with the received message (e.g., when using
1456 * abbreviated handshake), so Phase 2 can be started immediately
1457 * without having to send through an empty message to the peer.
1458 */
1459
1460 return eap_fast_phase1_done(sm, data);
1461 }
1462
1463
1464 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1465 struct eap_fast_data *data)
1466 {
1467 u8 next_type;
1468
1469 if (data->identity) {
1470 os_free(sm->identity);
1471 sm->identity = data->identity;
1472 data->identity = NULL;
1473 sm->identity_len = data->identity_len;
1474 data->identity_len = 0;
1475 sm->require_identity_match = 1;
1476 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1477 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1478 "Phase2 Identity not found "
1479 "in the user database",
1480 sm->identity, sm->identity_len);
1481 next_type = eap_fast_req_failure(sm, data);
1482 } else {
1483 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1484 "known - skip Phase 2 Identity Request");
1485 next_type = sm->user->methods[0].method;
1486 sm->user_eap_method_index = 1;
1487 }
1488
1489 eap_fast_state(data, PHASE2_METHOD);
1490 } else {
1491 eap_fast_state(data, PHASE2_ID);
1492 next_type = EAP_TYPE_IDENTITY;
1493 }
1494
1495 return eap_fast_phase2_init(sm, data, next_type);
1496 }
1497
1498
1499 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1500 const struct wpabuf *respData)
1501 {
1502 struct eap_fast_data *data = priv;
1503
1504 switch (data->state) {
1505 case PHASE1:
1506 if (eap_fast_process_phase1(sm, data))
1507 break;
1508
1509 /* fall through to PHASE2_START */
1510 case PHASE2_START:
1511 eap_fast_process_phase2_start(sm, data);
1512 break;
1513 case PHASE2_ID:
1514 case PHASE2_METHOD:
1515 case CRYPTO_BINDING:
1516 case REQUEST_PAC:
1517 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1518 break;
1519 default:
1520 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1521 data->state, __func__);
1522 break;
1523 }
1524 }
1525
1526
1527 static void eap_fast_process(struct eap_sm *sm, void *priv,
1528 struct wpabuf *respData)
1529 {
1530 struct eap_fast_data *data = priv;
1531 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1532 EAP_TYPE_FAST, eap_fast_process_version,
1533 eap_fast_process_msg) < 0)
1534 eap_fast_state(data, FAILURE);
1535 }
1536
1537
1538 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1539 {
1540 struct eap_fast_data *data = priv;
1541 return data->state == SUCCESS || data->state == FAILURE;
1542 }
1543
1544
1545 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1546 {
1547 struct eap_fast_data *data = priv;
1548 u8 *eapKeyData;
1549
1550 if (data->state != SUCCESS)
1551 return NULL;
1552
1553 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1554 if (eapKeyData == NULL)
1555 return NULL;
1556
1557 eap_fast_derive_eap_msk(data->simck, eapKeyData);
1558 *len = EAP_FAST_KEY_LEN;
1559
1560 return eapKeyData;
1561 }
1562
1563
1564 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1565 {
1566 struct eap_fast_data *data = priv;
1567 u8 *eapKeyData;
1568
1569 if (data->state != SUCCESS)
1570 return NULL;
1571
1572 eapKeyData = os_malloc(EAP_EMSK_LEN);
1573 if (eapKeyData == NULL)
1574 return NULL;
1575
1576 eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1577 *len = EAP_EMSK_LEN;
1578
1579 return eapKeyData;
1580 }
1581
1582
1583 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1584 {
1585 struct eap_fast_data *data = priv;
1586 return data->state == SUCCESS;
1587 }
1588
1589
1590 int eap_server_fast_register(void)
1591 {
1592 struct eap_method *eap;
1593 int ret;
1594
1595 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1596 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1597 if (eap == NULL)
1598 return -1;
1599
1600 eap->init = eap_fast_init;
1601 eap->reset = eap_fast_reset;
1602 eap->buildReq = eap_fast_buildReq;
1603 eap->check = eap_fast_check;
1604 eap->process = eap_fast_process;
1605 eap->isDone = eap_fast_isDone;
1606 eap->getKey = eap_fast_getKey;
1607 eap->get_emsk = eap_fast_get_emsk;
1608 eap->isSuccess = eap_fast_isSuccess;
1609
1610 ret = eap_server_method_register(eap);
1611 if (ret)
1612 eap_server_method_free(eap);
1613 return ret;
1614 }