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revert between 56095 -> 55830 in arch
[AROS.git] / workbench / network / WirelessManager / src / eap_server / eap_server_fast.c
blob39beb33056fb7c5f57deb841c32b94617cf1883b
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 if (sm->identity) {
795 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
796 sm->identity_len);
797 }
798
799 /* A-ID-Info (inside PAC-Info) */
800 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
801 srv_id_info_len);
802
803 /* PAC-Type (inside PAC-Info) */
804 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
805 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
806
807 /* Update PAC-Info and PAC TLV Length fields */
808 pos = wpabuf_put(buf, 0);
809 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
810 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
811
812 return buf;
813 }
814
815
816 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
817 struct eap_fast_data *data,
818 struct wpabuf *plain, int piggyback)
819 {
820 struct wpabuf *encr;
821
822 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
823 plain);
824 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
825 wpabuf_free(plain);
826
827 if (data->ssl.tls_out && piggyback) {
828 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
829 "(len=%d) with last Phase 1 Message (len=%d "
830 "used=%d)",
831 (int) wpabuf_len(encr),
832 (int) wpabuf_len(data->ssl.tls_out),
833 (int) data->ssl.tls_out_pos);
834 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
835 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
836 "output buffer");
837 wpabuf_free(encr);
838 return -1;
839 }
840 wpabuf_put_buf(data->ssl.tls_out, encr);
841 wpabuf_free(encr);
842 } else {
843 wpabuf_free(data->ssl.tls_out);
844 data->ssl.tls_out_pos = 0;
845 data->ssl.tls_out = encr;
846 }
847
848 return 0;
849 }
850
851
852 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
853 {
854 struct eap_fast_data *data = priv;
855 struct wpabuf *req = NULL;
856 int piggyback = 0;
857
858 if (data->ssl.state == FRAG_ACK) {
859 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
860 data->fast_version);
861 }
862
863 if (data->ssl.state == WAIT_FRAG_ACK) {
864 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
865 data->fast_version, id);
866 }
867
868 switch (data->state) {
869 case START:
870 return eap_fast_build_start(sm, data, id);
871 case PHASE1:
872 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
873 if (eap_fast_phase1_done(sm, data) < 0)
874 return NULL;
875 if (data->state == PHASE2_START) {
876 /*
877 * Try to generate Phase 2 data to piggyback
878 * with the end of Phase 1 to avoid extra
879 * roundtrip.
880 */
881 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
882 "Phase 2");
883 if (eap_fast_process_phase2_start(sm, data))
884 break;
885 req = eap_fast_build_phase2_req(sm, data, id);
886 piggyback = 1;
887 }
888 }
889 break;
890 case PHASE2_ID:
891 case PHASE2_METHOD:
892 req = eap_fast_build_phase2_req(sm, data, id);
893 break;
894 case CRYPTO_BINDING:
895 req = eap_fast_build_crypto_binding(sm, data);
896 if (data->phase2_method) {
897 /*
898 * Include the start of the next EAP method in the
899 * sequence in the same message with Crypto-Binding to
900 * save a round-trip.
901 */
902 struct wpabuf *eap;
903 eap = eap_fast_build_phase2_req(sm, data, id);
904 req = wpabuf_concat(req, eap);
905 eap_fast_state(data, PHASE2_METHOD);
906 }
907 break;
908 case REQUEST_PAC:
909 req = eap_fast_build_pac(sm, data);
910 break;
911 default:
912 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
913 __func__, data->state);
914 return NULL;
915 }
916
917 if (req &&
918 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
919 return NULL;
920
921 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
922 data->fast_version, id);
923 }
924
925
926 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
927 struct wpabuf *respData)
928 {
929 const u8 *pos;
930 size_t len;
931
932 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
933 if (pos == NULL || len < 1) {
934 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
935 return TRUE;
936 }
937
938 return FALSE;
939 }
940
941
942 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
943 EapType eap_type)
944 {
945 if (data->phase2_priv && data->phase2_method) {
946 data->phase2_method->reset(sm, data->phase2_priv);
947 data->phase2_method = NULL;
948 data->phase2_priv = NULL;
949 }
950 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
951 eap_type);
952 if (!data->phase2_method)
953 return -1;
954
955 if (data->key_block_p) {
956 sm->auth_challenge = data->key_block_p->server_challenge;
957 sm->peer_challenge = data->key_block_p->client_challenge;
958 }
959 sm->init_phase2 = 1;
960 data->phase2_priv = data->phase2_method->init(sm);
961 sm->init_phase2 = 0;
962 sm->auth_challenge = NULL;
963 sm->peer_challenge = NULL;
964
965 return data->phase2_priv == NULL ? -1 : 0;
966 }
967
968
969 static void eap_fast_process_phase2_response(struct eap_sm *sm,
970 struct eap_fast_data *data,
971 u8 *in_data, size_t in_len)
972 {
973 u8 next_type = EAP_TYPE_NONE;
974 struct eap_hdr *hdr;
975 u8 *pos;
976 size_t left;
977 struct wpabuf buf;
978 const struct eap_method *m = data->phase2_method;
979 void *priv = data->phase2_priv;
980
981 if (priv == NULL) {
982 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
983 "initialized?!", __func__);
984 return;
985 }
986
987 hdr = (struct eap_hdr *) in_data;
988 pos = (u8 *) (hdr + 1);
989
990 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
991 left = in_len - sizeof(*hdr);
992 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
993 "allowed types", pos + 1, left - 1);
994 #ifdef EAP_SERVER_TNC
995 if (m && m->vendor == EAP_VENDOR_IETF &&
996 m->method == EAP_TYPE_TNC) {
997 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
998 "TNC negotiation");
999 next_type = eap_fast_req_failure(sm, data);
1000 eap_fast_phase2_init(sm, data, next_type);
1001 return;
1002 }
1003 #endif /* EAP_SERVER_TNC */
1004 eap_sm_process_nak(sm, pos + 1, left - 1);
1005 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1006 sm->user->methods[sm->user_eap_method_index].method !=
1007 EAP_TYPE_NONE) {
1008 next_type = sm->user->methods[
1009 sm->user_eap_method_index++].method;
1010 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1011 next_type);
1012 } else {
1013 next_type = eap_fast_req_failure(sm, data);
1014 }
1015 eap_fast_phase2_init(sm, data, next_type);
1016 return;
1017 }
1018
1019 wpabuf_set(&buf, in_data, in_len);
1020
1021 if (m->check(sm, priv, &buf)) {
1022 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1023 "ignore the packet");
1024 next_type = eap_fast_req_failure(sm, data);
1025 return;
1026 }
1027
1028 m->process(sm, priv, &buf);
1029
1030 if (!m->isDone(sm, priv))
1031 return;
1032
1033 if (!m->isSuccess(sm, priv)) {
1034 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1035 next_type = eap_fast_req_failure(sm, data);
1036 eap_fast_phase2_init(sm, data, next_type);
1037 return;
1038 }
1039
1040 switch (data->state) {
1041 case PHASE2_ID:
1042 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1043 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1044 "Identity not found in the user "
1045 "database",
1046 sm->identity, sm->identity_len);
1047 next_type = eap_fast_req_failure(sm, data);
1048 break;
1049 }
1050
1051 eap_fast_state(data, PHASE2_METHOD);
1052 if (data->anon_provisioning) {
1053 /*
1054 * Only EAP-MSCHAPv2 is allowed for anonymous
1055 * provisioning.
1056 */
1057 next_type = EAP_TYPE_MSCHAPV2;
1058 sm->user_eap_method_index = 0;
1059 } else {
1060 next_type = sm->user->methods[0].method;
1061 sm->user_eap_method_index = 1;
1062 }
1063 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1064 break;
1065 case PHASE2_METHOD:
1066 case CRYPTO_BINDING:
1067 eap_fast_update_icmk(sm, data);
1068 eap_fast_state(data, CRYPTO_BINDING);
1069 data->eap_seq++;
1070 next_type = EAP_TYPE_NONE;
1071 #ifdef EAP_SERVER_TNC
1072 if (sm->tnc && !data->tnc_started) {
1073 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1074 next_type = EAP_TYPE_TNC;
1075 data->tnc_started = 1;
1076 }
1077 #endif /* EAP_SERVER_TNC */
1078 break;
1079 case FAILURE:
1080 break;
1081 default:
1082 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1083 __func__, data->state);
1084 break;
1085 }
1086
1087 eap_fast_phase2_init(sm, data, next_type);
1088 }
1089
1090
1091 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1092 struct eap_fast_data *data,
1093 u8 *in_data, size_t in_len)
1094 {
1095 struct eap_hdr *hdr;
1096 size_t len;
1097
1098 hdr = (struct eap_hdr *) in_data;
1099 if (in_len < (int) sizeof(*hdr)) {
1100 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1101 "EAP frame (len=%lu)", (unsigned long) in_len);
1102 eap_fast_req_failure(sm, data);
1103 return;
1104 }
1105 len = be_to_host16(hdr->length);
1106 if (len > in_len) {
1107 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1108 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1109 (unsigned long) in_len, (unsigned long) len);
1110 eap_fast_req_failure(sm, data);
1111 return;
1112 }
1113 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1114 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1115 (unsigned long) len);
1116 switch (hdr->code) {
1117 case EAP_CODE_RESPONSE:
1118 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1119 break;
1120 default:
1121 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1122 "Phase 2 EAP header", hdr->code);
1123 break;
1124 }
1125 }
1126
1127
1128 static int eap_fast_parse_tlvs(struct wpabuf *data,
1129 struct eap_fast_tlv_parse *tlv)
1130 {
1131 int mandatory, tlv_type, len, res;
1132 u8 *pos, *end;
1133
1134 os_memset(tlv, 0, sizeof(*tlv));
1135
1136 pos = wpabuf_mhead(data);
1137 end = pos + wpabuf_len(data);
1138 while (pos + 4 < end) {
1139 mandatory = pos[0] & 0x80;
1140 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1141 pos += 2;
1142 len = WPA_GET_BE16(pos);
1143 pos += 2;
1144 if (pos + len > end) {
1145 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1146 return -1;
1147 }
1148 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1149 "TLV type %d length %d%s",
1150 tlv_type, len, mandatory ? " (mandatory)" : "");
1151
1152 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1153 if (res == -2)
1154 break;
1155 if (res < 0) {
1156 if (mandatory) {
1157 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1158 "mandatory TLV type %d", tlv_type);
1159 /* TODO: generate Nak TLV */
1160 break;
1161 } else {
1162 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1163 "unknown optional TLV type %d",
1164 tlv_type);
1165 }
1166 }
1167
1168 pos += len;
1169 }
1170
1171 return 0;
1172 }
1173
1174
1175 static int eap_fast_validate_crypto_binding(
1176 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1177 size_t bind_len)
1178 {
1179 u8 cmac[SHA1_MAC_LEN];
1180
1181 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1182 "Version %d Received Version %d SubType %d",
1183 b->version, b->received_version, b->subtype);
1184 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1185 b->nonce, sizeof(b->nonce));
1186 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1187 b->compound_mac, sizeof(b->compound_mac));
1188
1189 if (b->version != EAP_FAST_VERSION ||
1190 b->received_version != EAP_FAST_VERSION) {
1191 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1192 "in Crypto-Binding: version %d "
1193 "received_version %d", b->version,
1194 b->received_version);
1195 return -1;
1196 }
1197
1198 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1199 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1200 "Crypto-Binding: %d", b->subtype);
1201 return -1;
1202 }
1203
1204 if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1205 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1206 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1207 "Crypto-Binding");
1208 return -1;
1209 }
1210
1211 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1212 os_memset(b->compound_mac, 0, sizeof(cmac));
1213 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1214 "Compound MAC calculation",
1215 (u8 *) b, bind_len);
1216 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1217 b->compound_mac);
1218 if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1219 wpa_hexdump(MSG_MSGDUMP,
1220 "EAP-FAST: Calculated Compound MAC",
1221 b->compound_mac, sizeof(cmac));
1222 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1223 "match");
1224 return -1;
1225 }
1226
1227 return 0;
1228 }
1229
1230
1231 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1232 {
1233 struct eap_tlv_pac_type_tlv *tlv;
1234
1235 if (pac == NULL || len != sizeof(*tlv))
1236 return 0;
1237
1238 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1239
1240 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1241 be_to_host16(tlv->length) == 2 &&
1242 be_to_host16(tlv->pac_type) == type;
1243 }
1244
1245
1246 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1247 struct eap_fast_data *data,
1248 struct wpabuf *in_data)
1249 {
1250 struct eap_fast_tlv_parse tlv;
1251 int check_crypto_binding = data->state == CRYPTO_BINDING;
1252
1253 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1254 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1255 "Phase 2 TLVs");
1256 return;
1257 }
1258
1259 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1260 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1261 "failure");
1262 eap_fast_state(data, FAILURE);
1263 return;
1264 }
1265
1266 if (data->state == REQUEST_PAC) {
1267 u16 type, len, res;
1268 if (tlv.pac == NULL || tlv.pac_len < 6) {
1269 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1270 "Acknowledgement received");
1271 eap_fast_state(data, FAILURE);
1272 return;
1273 }
1274
1275 type = WPA_GET_BE16(tlv.pac);
1276 len = WPA_GET_BE16(tlv.pac + 2);
1277 res = WPA_GET_BE16(tlv.pac + 4);
1278
1279 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1280 res != EAP_TLV_RESULT_SUCCESS) {
1281 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1282 "contain acknowledgement");
1283 eap_fast_state(data, FAILURE);
1284 return;
1285 }
1286
1287 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1288 "- PAC provisioning succeeded");
1289 eap_fast_state(data, (data->anon_provisioning ||
1290 data->send_new_pac == 2) ?
1291 FAILURE : SUCCESS);
1292 return;
1293 }
1294
1295 if (check_crypto_binding) {
1296 if (tlv.crypto_binding == NULL) {
1297 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1298 "TLV received");
1299 eap_fast_state(data, FAILURE);
1300 return;
1301 }
1302
1303 if (data->final_result &&
1304 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1305 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1306 "without Success Result");
1307 eap_fast_state(data, FAILURE);
1308 return;
1309 }
1310
1311 if (!data->final_result &&
1312 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1313 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1314 "without intermediate Success Result");
1315 eap_fast_state(data, FAILURE);
1316 return;
1317 }
1318
1319 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1320 tlv.crypto_binding_len)) {
1321 eap_fast_state(data, FAILURE);
1322 return;
1323 }
1324
1325 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1326 "received");
1327 if (data->final_result) {
1328 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1329 "completed successfully");
1330 }
1331
1332 if (data->anon_provisioning &&
1333 sm->eap_fast_prov != ANON_PROV &&
1334 sm->eap_fast_prov != BOTH_PROV) {
1335 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1336 "use unauthenticated provisioning which is "
1337 "disabled");
1338 eap_fast_state(data, FAILURE);
1339 return;
1340 }
1341
1342 if (sm->eap_fast_prov != AUTH_PROV &&
1343 sm->eap_fast_prov != BOTH_PROV &&
1344 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1345 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1346 PAC_TYPE_TUNNEL_PAC)) {
1347 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1348 "use authenticated provisioning which is "
1349 "disabled");
1350 eap_fast_state(data, FAILURE);
1351 return;
1352 }
1353
1354 if (data->anon_provisioning ||
1355 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1356 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1357 PAC_TYPE_TUNNEL_PAC))) {
1358 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1359 "Tunnel PAC");
1360 eap_fast_state(data, REQUEST_PAC);
1361 } else if (data->send_new_pac) {
1362 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1363 "re-keying of Tunnel PAC");
1364 eap_fast_state(data, REQUEST_PAC);
1365 } else if (data->final_result)
1366 eap_fast_state(data, SUCCESS);
1367 }
1368
1369 if (tlv.eap_payload_tlv) {
1370 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1371 tlv.eap_payload_tlv_len);
1372 }
1373 }
1374
1375
1376 static void eap_fast_process_phase2(struct eap_sm *sm,
1377 struct eap_fast_data *data,
1378 struct wpabuf *in_buf)
1379 {
1380 struct wpabuf *in_decrypted;
1381
1382 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1383 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1384
1385 if (data->pending_phase2_resp) {
1386 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1387 "skip decryption and use old data");
1388 eap_fast_process_phase2_tlvs(sm, data,
1389 data->pending_phase2_resp);
1390 wpabuf_free(data->pending_phase2_resp);
1391 data->pending_phase2_resp = NULL;
1392 return;
1393 }
1394
1395 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1396 in_buf);
1397 if (in_decrypted == NULL) {
1398 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1399 "data");
1400 eap_fast_state(data, FAILURE);
1401 return;
1402 }
1403
1404 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1405 in_decrypted);
1406
1407 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1408
1409 if (sm->method_pending == METHOD_PENDING_WAIT) {
1410 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1411 "pending wait state - save decrypted response");
1412 wpabuf_free(data->pending_phase2_resp);
1413 data->pending_phase2_resp = in_decrypted;
1414 return;
1415 }
1416
1417 wpabuf_free(in_decrypted);
1418 }
1419
1420
1421 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1422 int peer_version)
1423 {
1424 struct eap_fast_data *data = priv;
1425
1426 data->peer_version = peer_version;
1427
1428 if (data->force_version >= 0 && peer_version != data->force_version) {
1429 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1430 " version (forced=%d peer=%d) - reject",
1431 data->force_version, peer_version);
1432 return -1;
1433 }
1434
1435 if (peer_version < data->fast_version) {
1436 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1437 "use version %d",
1438 peer_version, data->fast_version, peer_version);
1439 data->fast_version = peer_version;
1440 }
1441
1442 return 0;
1443 }
1444
1445
1446 static int eap_fast_process_phase1(struct eap_sm *sm,
1447 struct eap_fast_data *data)
1448 {
1449 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1450 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1451 eap_fast_state(data, FAILURE);
1452 return -1;
1453 }
1454
1455 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1456 wpabuf_len(data->ssl.tls_out) > 0)
1457 return 1;
1458
1459 /*
1460 * Phase 1 was completed with the received message (e.g., when using
1461 * abbreviated handshake), so Phase 2 can be started immediately
1462 * without having to send through an empty message to the peer.
1463 */
1464
1465 return eap_fast_phase1_done(sm, data);
1466 }
1467
1468
1469 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1470 struct eap_fast_data *data)
1471 {
1472 u8 next_type;
1473
1474 if (data->identity) {
1475 os_free(sm->identity);
1476 sm->identity = data->identity;
1477 data->identity = NULL;
1478 sm->identity_len = data->identity_len;
1479 data->identity_len = 0;
1480 sm->require_identity_match = 1;
1481 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1482 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1483 "Phase2 Identity not found "
1484 "in the user database",
1485 sm->identity, sm->identity_len);
1486 next_type = eap_fast_req_failure(sm, data);
1487 } else {
1488 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1489 "known - skip Phase 2 Identity Request");
1490 next_type = sm->user->methods[0].method;
1491 sm->user_eap_method_index = 1;
1492 }
1493
1494 eap_fast_state(data, PHASE2_METHOD);
1495 } else {
1496 eap_fast_state(data, PHASE2_ID);
1497 next_type = EAP_TYPE_IDENTITY;
1498 }
1499
1500 return eap_fast_phase2_init(sm, data, next_type);
1501 }
1502
1503
1504 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1505 const struct wpabuf *respData)
1506 {
1507 struct eap_fast_data *data = priv;
1508
1509 switch (data->state) {
1510 case PHASE1:
1511 if (eap_fast_process_phase1(sm, data))
1512 break;
1513
1514 /* fall through to PHASE2_START */
1515 case PHASE2_START:
1516 eap_fast_process_phase2_start(sm, data);
1517 break;
1518 case PHASE2_ID:
1519 case PHASE2_METHOD:
1520 case CRYPTO_BINDING:
1521 case REQUEST_PAC:
1522 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1523 break;
1524 default:
1525 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1526 data->state, __func__);
1527 break;
1528 }
1529 }
1530
1531
1532 static void eap_fast_process(struct eap_sm *sm, void *priv,
1533 struct wpabuf *respData)
1534 {
1535 struct eap_fast_data *data = priv;
1536 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1537 EAP_TYPE_FAST, eap_fast_process_version,
1538 eap_fast_process_msg) < 0)
1539 eap_fast_state(data, FAILURE);
1540 }
1541
1542
1543 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1544 {
1545 struct eap_fast_data *data = priv;
1546 return data->state == SUCCESS || data->state == FAILURE;
1547 }
1548
1549
1550 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1551 {
1552 struct eap_fast_data *data = priv;
1553 u8 *eapKeyData;
1554
1555 if (data->state != SUCCESS)
1556 return NULL;
1557
1558 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1559 if (eapKeyData == NULL)
1560 return NULL;
1561
1562 eap_fast_derive_eap_msk(data->simck, eapKeyData);
1563 *len = EAP_FAST_KEY_LEN;
1564
1565 return eapKeyData;
1566 }
1567
1568
1569 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1570 {
1571 struct eap_fast_data *data = priv;
1572 u8 *eapKeyData;
1573
1574 if (data->state != SUCCESS)
1575 return NULL;
1576
1577 eapKeyData = os_malloc(EAP_EMSK_LEN);
1578 if (eapKeyData == NULL)
1579 return NULL;
1580
1581 eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1582 *len = EAP_EMSK_LEN;
1583
1584 return eapKeyData;
1585 }
1586
1587
1588 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1589 {
1590 struct eap_fast_data *data = priv;
1591 return data->state == SUCCESS;
1592 }
1593
1594
1595 int eap_server_fast_register(void)
1596 {
1597 struct eap_method *eap;
1598 int ret;
1599
1600 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1601 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1602 if (eap == NULL)
1603 return -1;
1604
1605 eap->init = eap_fast_init;
1606 eap->reset = eap_fast_reset;
1607 eap->buildReq = eap_fast_buildReq;
1608 eap->check = eap_fast_check;
1609 eap->process = eap_fast_process;
1610 eap->isDone = eap_fast_isDone;
1611 eap->getKey = eap_fast_getKey;
1612 eap->get_emsk = eap_fast_get_emsk;
1613 eap->isSuccess = eap_fast_isSuccess;
1614
1615 ret = eap_server_method_register(eap);
1616 if (ret)
1617 eap_server_method_free(eap);
1618 return ret;
1619 }
Mirror of AROS' svn.