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Expand PMF_FN_* macros.
[netbsd-mini2440.git] / dist / wpa / src / eap_server / eap_fast.c
blob6216d09387ca21d6867fc46d922af9ba8c56fa87
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 "aes_wrap.h"
19 #include "sha1.h"
20 #include "eap_i.h"
21 #include "eap_tls_common.h"
22 #include "tls.h"
23 #include "eap_common/eap_tlv_common.h"
24 #include "eap_common/eap_fast_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 /* PAC-Key lifetime in seconds (hard limit) */
37 #define PAC_KEY_LIFETIME (7 * 24 * 60 * 60)
38
39 /*
40 * PAC-Key refresh time in seconds (soft limit on remaining hard limit). The
41 * server will generate a new PAC-Key when this number of seconds (or fewer)
42 * of the lifetime.
43 */
44 #define PAC_KEY_REFRESH_TIME (1 * 24 * 60 * 60)
45
46
47 struct eap_fast_data {
48 struct eap_ssl_data ssl;
49 enum {
50 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
51 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
52 } state;
53
54 int fast_version;
55 const struct eap_method *phase2_method;
56 void *phase2_priv;
57 int force_version;
58 int peer_version;
59
60 u8 crypto_binding_nonce[32];
61 int final_result;
62
63 struct eap_fast_key_block_provisioning *key_block_p;
64
65 u8 simck[EAP_FAST_SIMCK_LEN];
66 u8 cmk[EAP_FAST_CMK_LEN];
67 int simck_idx;
68
69 u8 pac_opaque_encr[16];
70 char *srv_id;
71
72 int anon_provisioning;
73 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
74 struct wpabuf *pending_phase2_resp;
75 u8 *identity; /* from PAC-Opaque */
76 size_t identity_len;
77 int eap_seq;
78 int tnc_started;
79 };
80
81
82 static const char * eap_fast_state_txt(int state)
83 {
84 switch (state) {
85 case START:
86 return "START";
87 case PHASE1:
88 return "PHASE1";
89 case PHASE2_START:
90 return "PHASE2_START";
91 case PHASE2_ID:
92 return "PHASE2_ID";
93 case PHASE2_METHOD:
94 return "PHASE2_METHOD";
95 case CRYPTO_BINDING:
96 return "CRYPTO_BINDING";
97 case REQUEST_PAC:
98 return "REQUEST_PAC";
99 case SUCCESS:
100 return "SUCCESS";
101 case FAILURE:
102 return "FAILURE";
103 default:
104 return "Unknown?!";
105 }
106 }
107
108
109 static void eap_fast_state(struct eap_fast_data *data, int state)
110 {
111 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
112 eap_fast_state_txt(data->state),
113 eap_fast_state_txt(state));
114 data->state = state;
115 }
116
117
118 static EapType eap_fast_req_failure(struct eap_sm *sm,
119 struct eap_fast_data *data)
120 {
121 /* TODO: send Result TLV(FAILURE) */
122 eap_fast_state(data, FAILURE);
123 return EAP_TYPE_NONE;
124 }
125
126
127 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
128 const u8 *client_random,
129 const u8 *server_random,
130 u8 *master_secret)
131 {
132 struct eap_fast_data *data = ctx;
133 const u8 *pac_opaque;
134 size_t pac_opaque_len;
135 u8 *buf, *pos, *end, *pac_key = NULL;
136 os_time_t lifetime = 0;
137 struct os_time now;
138 u8 *identity = NULL;
139 size_t identity_len = 0;
140
141 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
142 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
143 ticket, len);
144
145 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
146 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
147 "SessionTicket");
148 return 0;
149 }
150
151 pac_opaque_len = WPA_GET_BE16(ticket + 2);
152 pac_opaque = ticket + 4;
153 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
154 pac_opaque_len > len - 4) {
155 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
156 "(len=%lu left=%lu)",
157 (unsigned long) pac_opaque_len,
158 (unsigned long) len);
159 return 0;
160 }
161 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
162 pac_opaque, pac_opaque_len);
163
164 buf = os_malloc(pac_opaque_len - 8);
165 if (buf == NULL) {
166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
167 "for decrypting PAC-Opaque");
168 return 0;
169 }
170
171 if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
172 pac_opaque, buf) < 0) {
173 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
174 "PAC-Opaque");
175 os_free(buf);
176 /*
177 * This may have been caused by server changing the PAC-Opaque
178 * encryption key, so just ignore this PAC-Opaque instead of
179 * failing the authentication completely. Provisioning can now
180 * be used to provision a new PAC.
181 */
182 return 0;
183 }
184
185 end = buf + pac_opaque_len - 8;
186 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
187 buf, end - buf);
188
189 pos = buf;
190 while (pos + 1 < end) {
191 if (pos + 2 + pos[1] > end)
192 break;
193
194 switch (*pos) {
195 case PAC_OPAQUE_TYPE_PAD:
196 pos = end;
197 break;
198 case PAC_OPAQUE_TYPE_KEY:
199 if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
200 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
201 "PAC-Key length %d", pos[1]);
202 os_free(buf);
203 return -1;
204 }
205 pac_key = pos + 2;
206 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
207 "decrypted PAC-Opaque",
208 pac_key, EAP_FAST_PAC_KEY_LEN);
209 break;
210 case PAC_OPAQUE_TYPE_LIFETIME:
211 if (pos[1] != 4) {
212 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
213 "PAC-Key lifetime length %d",
214 pos[1]);
215 os_free(buf);
216 return -1;
217 }
218 lifetime = WPA_GET_BE32(pos + 2);
219 break;
220 case PAC_OPAQUE_TYPE_IDENTITY:
221 identity = pos + 2;
222 identity_len = pos[1];
223 break;
224 }
225
226 pos += 2 + pos[1];
227 }
228
229 if (pac_key == NULL) {
230 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
231 "PAC-Opaque");
232 os_free(buf);
233 return -1;
234 }
235
236 if (identity) {
237 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
238 "PAC-Opaque", identity, identity_len);
239 os_free(data->identity);
240 data->identity = os_malloc(identity_len);
241 if (data->identity) {
242 os_memcpy(data->identity, identity, identity_len);
243 data->identity_len = identity_len;
244 }
245 }
246
247 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
248 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
249 "(lifetime=%ld now=%ld)", lifetime, now.sec);
250 os_free(buf);
251 return 0;
252 }
253
254 if (lifetime - now.sec < PAC_KEY_REFRESH_TIME)
255 data->send_new_pac = 1;
256
257 eap_fast_derive_master_secret(pac_key, server_random, client_random,
258 master_secret);
259
260 os_free(buf);
261
262 return 1;
263 }
264
265
266 static void eap_fast_derive_key_auth(struct eap_sm *sm,
267 struct eap_fast_data *data)
268 {
269 u8 *sks;
270
271 /* RFC 4851, Section 5.1:
272 * Extra key material after TLS key_block: session_key_seed[40]
273 */
274
275 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
276 EAP_FAST_SKS_LEN);
277 if (sks == NULL) {
278 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
279 "session_key_seed");
280 return;
281 }
282
283 /*
284 * RFC 4851, Section 5.2:
285 * S-IMCK[0] = session_key_seed
286 */
287 wpa_hexdump_key(MSG_DEBUG,
288 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
289 sks, EAP_FAST_SKS_LEN);
290 data->simck_idx = 0;
291 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
292 os_free(sks);
293 }
294
295
296 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
297 struct eap_fast_data *data)
298 {
299 os_free(data->key_block_p);
300 data->key_block_p = (struct eap_fast_key_block_provisioning *)
301 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
302 "key expansion",
303 sizeof(*data->key_block_p));
304 if (data->key_block_p == NULL) {
305 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
306 return;
307 }
308 /*
309 * RFC 4851, Section 5.2:
310 * S-IMCK[0] = session_key_seed
311 */
312 wpa_hexdump_key(MSG_DEBUG,
313 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
314 data->key_block_p->session_key_seed,
315 sizeof(data->key_block_p->session_key_seed));
316 data->simck_idx = 0;
317 os_memcpy(data->simck, data->key_block_p->session_key_seed,
318 EAP_FAST_SIMCK_LEN);
319 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
320 data->key_block_p->server_challenge,
321 sizeof(data->key_block_p->server_challenge));
322 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
323 data->key_block_p->client_challenge,
324 sizeof(data->key_block_p->client_challenge));
325 }
326
327
328 static int eap_fast_get_phase2_key(struct eap_sm *sm,
329 struct eap_fast_data *data,
330 u8 *isk, size_t isk_len)
331 {
332 u8 *key;
333 size_t key_len;
334
335 os_memset(isk, 0, isk_len);
336
337 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
338 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
339 "available");
340 return -1;
341 }
342
343 if (data->phase2_method->getKey == NULL)
344 return 0;
345
346 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
347 &key_len)) == NULL) {
348 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
349 "from Phase 2");
350 return -1;
351 }
352
353 if (key_len > isk_len)
354 key_len = isk_len;
355 os_memcpy(isk, key, key_len);
356 os_free(key);
357
358 return 0;
359 }
360
361
362 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
363 {
364 u8 isk[32], imck[60];
365
366 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
367 data->simck_idx + 1);
368
369 /*
370 * RFC 4851, Section 5.2:
371 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
372 * MSK[j], 60)
373 * S-IMCK[j] = first 40 octets of IMCK[j]
374 * CMK[j] = last 20 octets of IMCK[j]
375 */
376
377 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
378 return -1;
379 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
380 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
381 "Inner Methods Compound Keys",
382 isk, sizeof(isk), imck, sizeof(imck));
383 data->simck_idx++;
384 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
385 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
386 data->simck, EAP_FAST_SIMCK_LEN);
387 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
388 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
389 data->cmk, EAP_FAST_CMK_LEN);
390
391 return 0;
392 }
393
394
395 static void * eap_fast_init(struct eap_sm *sm)
396 {
397 struct eap_fast_data *data;
398 u8 ciphers[5] = {
399 TLS_CIPHER_ANON_DH_AES128_SHA,
400 TLS_CIPHER_AES128_SHA,
401 TLS_CIPHER_RSA_DHE_AES128_SHA,
402 TLS_CIPHER_RC4_SHA,
403 TLS_CIPHER_NONE
404 };
405
406 data = os_zalloc(sizeof(*data));
407 if (data == NULL)
408 return NULL;
409 data->fast_version = EAP_FAST_VERSION;
410 data->force_version = -1;
411 if (sm->user && sm->user->force_version >= 0) {
412 data->force_version = sm->user->force_version;
413 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
414 data->force_version);
415 data->fast_version = data->force_version;
416 }
417 data->state = START;
418
419 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
420 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
421 eap_fast_reset(sm, data);
422 return NULL;
423 }
424
425 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
426 ciphers) < 0) {
427 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
428 "suites");
429 eap_fast_reset(sm, data);
430 return NULL;
431 }
432
433 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
434 eap_fast_session_ticket_cb,
435 data) < 0) {
436 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
437 "callback");
438 eap_fast_reset(sm, data);
439 return NULL;
440 }
441
442 if (sm->pac_opaque_encr_key == NULL) {
443 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
444 "configured");
445 eap_fast_reset(sm, data);
446 return NULL;
447 }
448 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
449 sizeof(data->pac_opaque_encr));
450
451 if (sm->eap_fast_a_id == NULL) {
452 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
453 eap_fast_reset(sm, data);
454 return NULL;
455 }
456 data->srv_id = os_strdup(sm->eap_fast_a_id);
457 if (data->srv_id == NULL) {
458 eap_fast_reset(sm, data);
459 return NULL;
460 }
461
462 return data;
463 }
464
465
466 static void eap_fast_reset(struct eap_sm *sm, void *priv)
467 {
468 struct eap_fast_data *data = priv;
469 if (data == NULL)
470 return;
471 if (data->phase2_priv && data->phase2_method)
472 data->phase2_method->reset(sm, data->phase2_priv);
473 eap_server_tls_ssl_deinit(sm, &data->ssl);
474 os_free(data->srv_id);
475 os_free(data->key_block_p);
476 wpabuf_free(data->pending_phase2_resp);
477 os_free(data->identity);
478 os_free(data);
479 }
480
481
482 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
483 struct eap_fast_data *data, u8 id)
484 {
485 struct wpabuf *req;
486 size_t srv_id_len = os_strlen(data->srv_id);
487
488 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
489 1 + sizeof(struct pac_tlv_hdr) + srv_id_len,
490 EAP_CODE_REQUEST, id);
491 if (req == NULL) {
492 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
493 " request");
494 eap_fast_state(data, FAILURE);
495 return NULL;
496 }
497
498 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
499
500 /* RFC 4851, 4.1.1. Authority ID Data */
501 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, srv_id_len);
502
503 eap_fast_state(data, PHASE1);
504
505 return req;
506 }
507
508
509 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
510 {
511 char cipher[64];
512
513 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
514
515 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
516 < 0) {
517 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
518 "information");
519 eap_fast_state(data, FAILURE);
520 return -1;
521 }
522 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
523
524 if (data->anon_provisioning) {
525 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
526 eap_fast_derive_key_provisioning(sm, data);
527 } else
528 eap_fast_derive_key_auth(sm, data);
529
530 eap_fast_state(data, PHASE2_START);
531
532 return 0;
533 }
534
535
536 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
537 struct eap_fast_data *data,
538 u8 id)
539 {
540 struct wpabuf *req;
541
542 if (data->phase2_priv == NULL) {
543 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
544 "initialized");
545 return NULL;
546 }
547 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
548 if (req == NULL)
549 return NULL;
550
551 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
552 return eap_fast_tlv_eap_payload(req);
553 }
554
555
556 static struct wpabuf * eap_fast_build_crypto_binding(
557 struct eap_sm *sm, struct eap_fast_data *data)
558 {
559 struct wpabuf *buf;
560 struct eap_tlv_result_tlv *result;
561 struct eap_tlv_crypto_binding_tlv *binding;
562
563 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
564 if (buf == NULL)
565 return NULL;
566
567 if (data->send_new_pac || data->anon_provisioning ||
568 data->phase2_method)
569 data->final_result = 0;
570 else
571 data->final_result = 1;
572
573 if (!data->final_result || data->eap_seq > 1) {
574 /* Intermediate-Result */
575 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
576 "(status=SUCCESS)");
577 result = wpabuf_put(buf, sizeof(*result));
578 result->tlv_type = host_to_be16(
579 EAP_TLV_TYPE_MANDATORY |
580 EAP_TLV_INTERMEDIATE_RESULT_TLV);
581 result->length = host_to_be16(2);
582 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
583 }
584
585 if (data->final_result) {
586 /* Result TLV */
587 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
588 "(status=SUCCESS)");
589 result = wpabuf_put(buf, sizeof(*result));
590 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
591 EAP_TLV_RESULT_TLV);
592 result->length = host_to_be16(2);
593 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
594 }
595
596 /* Crypto-Binding TLV */
597 binding = wpabuf_put(buf, sizeof(*binding));
598 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
599 EAP_TLV_CRYPTO_BINDING_TLV);
600 binding->length = host_to_be16(sizeof(*binding) -
601 sizeof(struct eap_tlv_hdr));
602 binding->version = EAP_FAST_VERSION;
603 binding->received_version = data->peer_version;
604 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
605 if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
606 wpabuf_free(buf);
607 return NULL;
608 }
609
610 /*
611 * RFC 4851, Section 4.2.8:
612 * The nonce in a request MUST have its least significant bit set to 0.
613 */
614 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
615
616 os_memcpy(data->crypto_binding_nonce, binding->nonce,
617 sizeof(binding->nonce));
618
619 /*
620 * RFC 4851, Section 5.3:
621 * CMK = CMK[j]
622 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
623 */
624
625 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
626 (u8 *) binding, sizeof(*binding),
627 binding->compound_mac);
628
629 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
630 "Received Version %d SubType %d",
631 binding->version, binding->received_version,
632 binding->subtype);
633 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
634 binding->nonce, sizeof(binding->nonce));
635 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
636 binding->compound_mac, sizeof(binding->compound_mac));
637
638 return buf;
639 }
640
641
642 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
643 struct eap_fast_data *data)
644 {
645 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
646 u8 *pac_buf, *pac_opaque;
647 struct wpabuf *buf;
648 u8 *pos;
649 size_t buf_len, srv_id_len, pac_len;
650 struct eap_tlv_hdr *pac_tlv;
651 struct pac_tlv_hdr *pac_info;
652 struct eap_tlv_result_tlv *result;
653 struct os_time now;
654
655 if (os_get_random(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
656 os_get_time(&now) < 0)
657 return NULL;
658 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
659 pac_key, EAP_FAST_PAC_KEY_LEN);
660
661 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
662 (2 + sm->identity_len) + 8;
663 pac_buf = os_malloc(pac_len);
664 if (pac_buf == NULL)
665 return NULL;
666
667 srv_id_len = os_strlen(data->srv_id);
668
669 pos = pac_buf;
670 *pos++ = PAC_OPAQUE_TYPE_KEY;
671 *pos++ = EAP_FAST_PAC_KEY_LEN;
672 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
673 pos += EAP_FAST_PAC_KEY_LEN;
674
675 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
676 *pos++ = 4;
677 WPA_PUT_BE32(pos, now.sec + PAC_KEY_LIFETIME);
678 pos += 4;
679
680 if (sm->identity) {
681 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
682 *pos++ = sm->identity_len;
683 os_memcpy(pos, sm->identity, sm->identity_len);
684 pos += sm->identity_len;
685 }
686
687 pac_len = pos - pac_buf;
688 if (pac_len % 8) {
689 *pos++ = PAC_OPAQUE_TYPE_PAD;
690 pac_len++;
691 }
692
693 pac_opaque = os_malloc(pac_len + 8);
694 if (pac_opaque == NULL) {
695 os_free(pac_buf);
696 return NULL;
697 }
698 if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
699 pac_opaque) < 0) {
700 os_free(pac_buf);
701 os_free(pac_opaque);
702 return NULL;
703 }
704 os_free(pac_buf);
705
706 pac_len += 8;
707 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
708 pac_opaque, pac_len);
709
710 buf_len = sizeof(*pac_tlv) +
711 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
712 sizeof(struct pac_tlv_hdr) + pac_len +
713 2 * srv_id_len + 100 + sizeof(*result);
714 buf = wpabuf_alloc(buf_len);
715 if (buf == NULL) {
716 os_free(pac_opaque);
717 return NULL;
718 }
719
720 /* PAC TLV */
721 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
722 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
723 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
724 EAP_TLV_PAC_TLV);
725
726 /* PAC-Key */
727 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
728
729 /* PAC-Opaque */
730 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
731 os_free(pac_opaque);
732
733 /* PAC-Info */
734 pac_info = wpabuf_put(buf, sizeof(*pac_info));
735 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
736
737 /* PAC-Lifetime (inside PAC-Info) */
738 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
739 wpabuf_put_be32(buf, now.sec + PAC_KEY_LIFETIME);
740
741 /* A-ID (inside PAC-Info) */
742 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, srv_id_len);
743
744 /* Note: headers may be misaligned after A-ID */
745
746 /* A-ID-Info (inside PAC-Info) */
747 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id, srv_id_len);
748
749 /* PAC-Type (inside PAC-Info) */
750 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
751 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
752
753 /* Update PAC-Info and PAC TLV Length fields */
754 pos = wpabuf_put(buf, 0);
755 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
756 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
757
758 /* Result TLV */
759 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
760 result = wpabuf_put(buf, sizeof(*result));
761 WPA_PUT_BE16((u8 *) &result->tlv_type,
762 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
763 WPA_PUT_BE16((u8 *) &result->length, 2);
764 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
765
766 return buf;
767 }
768
769
770 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
771 {
772 struct eap_fast_data *data = priv;
773 struct wpabuf *req = NULL;
774 struct wpabuf *encr;
775
776 if (data->ssl.state == FRAG_ACK) {
777 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
778 data->fast_version);
779 }
780
781 if (data->ssl.state == WAIT_FRAG_ACK) {
782 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
783 data->fast_version, id);
784 }
785
786 switch (data->state) {
787 case START:
788 return eap_fast_build_start(sm, data, id);
789 case PHASE1:
790 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
791 if (eap_fast_phase1_done(sm, data) < 0)
792 return NULL;
793 }
794 break;
795 case PHASE2_ID:
796 case PHASE2_METHOD:
797 req = eap_fast_build_phase2_req(sm, data, id);
798 break;
799 case CRYPTO_BINDING:
800 req = eap_fast_build_crypto_binding(sm, data);
801 if (data->phase2_method) {
802 /*
803 * Include the start of the next EAP method in the
804 * sequence in the same message with Crypto-Binding to
805 * save a round-trip.
806 */
807 struct wpabuf *eap;
808 eap = eap_fast_build_phase2_req(sm, data, id);
809 req = wpabuf_concat(req, eap);
810 eap_fast_state(data, PHASE2_METHOD);
811 }
812 break;
813 case REQUEST_PAC:
814 req = eap_fast_build_pac(sm, data);
815 break;
816 default:
817 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
818 __func__, data->state);
819 return NULL;
820 }
821
822 if (req) {
823 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 "
824 "TLVs", req);
825 encr = eap_server_tls_encrypt(sm, &data->ssl,
826 wpabuf_mhead(req),
827 wpabuf_len(req));
828 wpabuf_free(req);
829
830 wpabuf_free(data->ssl.out_buf);
831 data->ssl.out_used = 0;
832 data->ssl.out_buf = encr;
833 }
834
835 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
836 data->fast_version, id);
837 }
838
839
840 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
841 struct wpabuf *respData)
842 {
843 const u8 *pos;
844 size_t len;
845
846 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
847 if (pos == NULL || len < 1) {
848 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
849 return TRUE;
850 }
851
852 return FALSE;
853 }
854
855
856 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
857 EapType eap_type)
858 {
859 if (data->phase2_priv && data->phase2_method) {
860 data->phase2_method->reset(sm, data->phase2_priv);
861 data->phase2_method = NULL;
862 data->phase2_priv = NULL;
863 }
864 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
865 eap_type);
866 if (!data->phase2_method)
867 return -1;
868
869 if (data->key_block_p) {
870 sm->auth_challenge = data->key_block_p->server_challenge;
871 sm->peer_challenge = data->key_block_p->client_challenge;
872 }
873 sm->init_phase2 = 1;
874 data->phase2_priv = data->phase2_method->init(sm);
875 sm->init_phase2 = 0;
876 sm->auth_challenge = NULL;
877 sm->peer_challenge = NULL;
878
879 return data->phase2_priv == NULL ? -1 : 0;
880 }
881
882
883 static void eap_fast_process_phase2_response(struct eap_sm *sm,
884 struct eap_fast_data *data,
885 u8 *in_data, size_t in_len)
886 {
887 u8 next_type = EAP_TYPE_NONE;
888 struct eap_hdr *hdr;
889 u8 *pos;
890 size_t left;
891 struct wpabuf buf;
892 const struct eap_method *m = data->phase2_method;
893 void *priv = data->phase2_priv;
894
895 if (priv == NULL) {
896 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
897 "initialized?!", __func__);
898 return;
899 }
900
901 hdr = (struct eap_hdr *) in_data;
902 pos = (u8 *) (hdr + 1);
903
904 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
905 left = in_len - sizeof(*hdr);
906 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
907 "allowed types", pos + 1, left - 1);
908 #ifdef EAP_TNC
909 if (m && m->vendor == EAP_VENDOR_IETF &&
910 m->method == EAP_TYPE_TNC) {
911 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
912 "TNC negotiation");
913 next_type = eap_fast_req_failure(sm, data);
914 eap_fast_phase2_init(sm, data, next_type);
915 return;
916 }
917 #endif /* EAP_TNC */
918 eap_sm_process_nak(sm, pos + 1, left - 1);
919 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
920 sm->user->methods[sm->user_eap_method_index].method !=
921 EAP_TYPE_NONE) {
922 next_type = sm->user->methods[
923 sm->user_eap_method_index++].method;
924 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
925 next_type);
926 } else {
927 next_type = eap_fast_req_failure(sm, data);
928 }
929 eap_fast_phase2_init(sm, data, next_type);
930 return;
931 }
932
933 wpabuf_set(&buf, in_data, in_len);
934
935 if (m->check(sm, priv, &buf)) {
936 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
937 "ignore the packet");
938 next_type = eap_fast_req_failure(sm, data);
939 return;
940 }
941
942 m->process(sm, priv, &buf);
943
944 if (!m->isDone(sm, priv))
945 return;
946
947 if (!m->isSuccess(sm, priv)) {
948 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
949 next_type = eap_fast_req_failure(sm, data);
950 eap_fast_phase2_init(sm, data, next_type);
951 return;
952 }
953
954 switch (data->state) {
955 case PHASE2_ID:
956 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
957 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
958 "Identity not found in the user "
959 "database",
960 sm->identity, sm->identity_len);
961 next_type = eap_fast_req_failure(sm, data);
962 break;
963 }
964
965 eap_fast_state(data, PHASE2_METHOD);
966 if (data->anon_provisioning) {
967 /*
968 * Only EAP-MSCHAPv2 is allowed for anonymous
969 * provisioning.
970 */
971 next_type = EAP_TYPE_MSCHAPV2;
972 sm->user_eap_method_index = 0;
973 } else {
974 next_type = sm->user->methods[0].method;
975 sm->user_eap_method_index = 1;
976 }
977 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
978 break;
979 case PHASE2_METHOD:
980 case CRYPTO_BINDING:
981 eap_fast_update_icmk(sm, data);
982 eap_fast_state(data, CRYPTO_BINDING);
983 data->eap_seq++;
984 next_type = EAP_TYPE_NONE;
985 #ifdef EAP_TNC
986 if (sm->tnc && !data->tnc_started) {
987 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
988 next_type = EAP_TYPE_TNC;
989 data->tnc_started = 1;
990 }
991 #endif /* EAP_TNC */
992 break;
993 case FAILURE:
994 break;
995 default:
996 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
997 __func__, data->state);
998 break;
999 }
1000
1001 eap_fast_phase2_init(sm, data, next_type);
1002 }
1003
1004
1005 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1006 struct eap_fast_data *data,
1007 u8 *in_data, size_t in_len)
1008 {
1009 struct eap_hdr *hdr;
1010 size_t len;
1011
1012 hdr = (struct eap_hdr *) in_data;
1013 if (in_len < (int) sizeof(*hdr)) {
1014 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1015 "EAP frame (len=%d)", in_len);
1016 eap_fast_req_failure(sm, data);
1017 return;
1018 }
1019 len = be_to_host16(hdr->length);
1020 if (len > in_len) {
1021 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1022 "Phase 2 EAP frame (len=%d hdr->length=%d)",
1023 in_len, len);
1024 eap_fast_req_failure(sm, data);
1025 return;
1026 }
1027 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1028 "identifier=%d length=%d", hdr->code, hdr->identifier, len);
1029 switch (hdr->code) {
1030 case EAP_CODE_RESPONSE:
1031 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1032 break;
1033 default:
1034 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1035 "Phase 2 EAP header", hdr->code);
1036 break;
1037 }
1038 }
1039
1040
1041 static int eap_fast_parse_tlvs(u8 *data, size_t data_len,
1042 struct eap_fast_tlv_parse *tlv)
1043 {
1044 int mandatory, tlv_type, len, res;
1045 u8 *pos, *end;
1046
1047 os_memset(tlv, 0, sizeof(*tlv));
1048
1049 pos = data;
1050 end = data + data_len;
1051 while (pos + 4 < end) {
1052 mandatory = pos[0] & 0x80;
1053 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1054 pos += 2;
1055 len = WPA_GET_BE16(pos);
1056 pos += 2;
1057 if (pos + len > end) {
1058 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1059 return -1;
1060 }
1061 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1062 "TLV type %d length %d%s",
1063 tlv_type, len, mandatory ? " (mandatory)" : "");
1064
1065 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1066 if (res == -2)
1067 break;
1068 if (res < 0) {
1069 if (mandatory) {
1070 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1071 "mandatory TLV type %d", tlv_type);
1072 /* TODO: generate Nak TLV */
1073 break;
1074 } else {
1075 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1076 "unknown optional TLV type %d",
1077 tlv_type);
1078 }
1079 }
1080
1081 pos += len;
1082 }
1083
1084 return 0;
1085 }
1086
1087
1088 static int eap_fast_validate_crypto_binding(
1089 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1090 size_t bind_len)
1091 {
1092 u8 cmac[SHA1_MAC_LEN];
1093
1094 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1095 "Version %d Received Version %d SubType %d",
1096 b->version, b->received_version, b->subtype);
1097 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1098 b->nonce, sizeof(b->nonce));
1099 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1100 b->compound_mac, sizeof(b->compound_mac));
1101
1102 if (b->version != EAP_FAST_VERSION ||
1103 b->received_version != EAP_FAST_VERSION) {
1104 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1105 "in Crypto-Binding: version %d "
1106 "received_version %d", b->version,
1107 b->received_version);
1108 return -1;
1109 }
1110
1111 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1112 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1113 "Crypto-Binding: %d", b->subtype);
1114 return -1;
1115 }
1116
1117 if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1118 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1119 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1120 "Crypto-Binding");
1121 return -1;
1122 }
1123
1124 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1125 os_memset(b->compound_mac, 0, sizeof(cmac));
1126 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1127 "Compound MAC calculation",
1128 (u8 *) b, bind_len);
1129 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1130 b->compound_mac);
1131 if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1132 wpa_hexdump(MSG_MSGDUMP,
1133 "EAP-FAST: Calculated Compound MAC",
1134 b->compound_mac, sizeof(cmac));
1135 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1136 "match");
1137 return -1;
1138 }
1139
1140 return 0;
1141 }
1142
1143
1144 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1145 {
1146 struct eap_tlv_pac_type_tlv *tlv;
1147
1148 if (pac == NULL || len != sizeof(*tlv))
1149 return 0;
1150
1151 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1152
1153 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1154 be_to_host16(tlv->length) == 2 &&
1155 be_to_host16(tlv->pac_type) == type;
1156 }
1157
1158
1159 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1160 struct eap_fast_data *data,
1161 u8 *in_data, size_t in_len)
1162 {
1163 struct eap_fast_tlv_parse tlv;
1164 int check_crypto_binding = data->state == CRYPTO_BINDING;
1165
1166 if (eap_fast_parse_tlvs(in_data, in_len, &tlv) < 0) {
1167 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1168 "Phase 2 TLVs");
1169 return;
1170 }
1171
1172 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1173 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1174 "failure");
1175 eap_fast_state(data, FAILURE);
1176 return;
1177 }
1178
1179 if (data->state == REQUEST_PAC) {
1180 u16 type, len, res;
1181 if (tlv.pac == NULL || tlv.pac_len < 6) {
1182 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1183 "Acknowledgement received");
1184 eap_fast_state(data, FAILURE);
1185 return;
1186 }
1187
1188 type = WPA_GET_BE16(tlv.pac);
1189 len = WPA_GET_BE16(tlv.pac + 2);
1190 res = WPA_GET_BE16(tlv.pac + 4);
1191
1192 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1193 res != EAP_TLV_RESULT_SUCCESS) {
1194 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1195 "contain acknowledgement");
1196 eap_fast_state(data, FAILURE);
1197 return;
1198 }
1199
1200 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1201 "- PAC provisioning succeeded");
1202 eap_fast_state(data, data->anon_provisioning ?
1203 FAILURE : SUCCESS);
1204 return;
1205 }
1206
1207 if (check_crypto_binding) {
1208 if (tlv.crypto_binding == NULL) {
1209 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1210 "TLV received");
1211 eap_fast_state(data, FAILURE);
1212 return;
1213 }
1214
1215 if (data->final_result &&
1216 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1217 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1218 "without Success Result");
1219 eap_fast_state(data, FAILURE);
1220 return;
1221 }
1222
1223 if (!data->final_result &&
1224 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1225 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1226 "without intermediate Success Result");
1227 eap_fast_state(data, FAILURE);
1228 return;
1229 }
1230
1231 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1232 tlv.crypto_binding_len)) {
1233 eap_fast_state(data, FAILURE);
1234 return;
1235 }
1236
1237 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1238 "received");
1239 if (data->final_result) {
1240 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1241 "completed successfully");
1242 }
1243
1244 if (data->anon_provisioning ||
1245 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1246 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1247 PAC_TYPE_TUNNEL_PAC))) {
1248 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1249 "Tunnel PAC");
1250 eap_fast_state(data, REQUEST_PAC);
1251 } else if (data->send_new_pac) {
1252 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1253 "re-keying of Tunnel PAC");
1254 eap_fast_state(data, REQUEST_PAC);
1255 } else if (data->final_result)
1256 eap_fast_state(data, SUCCESS);
1257 }
1258
1259 if (tlv.eap_payload_tlv) {
1260 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1261 tlv.eap_payload_tlv_len);
1262 }
1263 }
1264
1265
1266 static void eap_fast_process_phase2(struct eap_sm *sm,
1267 struct eap_fast_data *data,
1268 struct wpabuf *in_buf)
1269 {
1270 u8 *in_decrypted;
1271 int len_decrypted;
1272 size_t buf_len;
1273 u8 *in_data;
1274 size_t in_len;
1275
1276 in_data = wpabuf_mhead(in_buf);
1277 in_len = wpabuf_len(in_buf);
1278
1279 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1280 " Phase 2", (unsigned long) in_len);
1281
1282 if (data->pending_phase2_resp) {
1283 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1284 "skip decryption and use old data");
1285 eap_fast_process_phase2_tlvs(
1286 sm, data, wpabuf_mhead(data->pending_phase2_resp),
1287 wpabuf_len(data->pending_phase2_resp));
1288 wpabuf_free(data->pending_phase2_resp);
1289 data->pending_phase2_resp = NULL;
1290 return;
1291 }
1292
1293 buf_len = in_len;
1294 /*
1295 * Even though we try to disable TLS compression, it is possible that
1296 * this cannot be done with all TLS libraries. Add extra buffer space
1297 * to handle the possibility of the decrypted data being longer than
1298 * input data.
1299 */
1300 buf_len += 500;
1301 buf_len *= 3;
1302 in_decrypted = os_malloc(buf_len);
1303 if (in_decrypted == NULL) {
1304 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to allocate memory "
1305 "for decryption");
1306 return;
1307 }
1308
1309 len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1310 in_data, in_len,
1311 in_decrypted, buf_len);
1312 if (len_decrypted < 0) {
1313 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1314 "data");
1315 os_free(in_decrypted);
1316 eap_fast_state(data, FAILURE);
1317 return;
1318 }
1319
1320 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1321 in_decrypted, len_decrypted);
1322
1323 eap_fast_process_phase2_tlvs(sm, data, in_decrypted, len_decrypted);
1324
1325 if (sm->method_pending == METHOD_PENDING_WAIT) {
1326 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1327 "pending wait state - save decrypted response");
1328 wpabuf_free(data->pending_phase2_resp);
1329 data->pending_phase2_resp = wpabuf_alloc_copy(in_decrypted,
1330 len_decrypted);
1331 }
1332
1333 os_free(in_decrypted);
1334 }
1335
1336
1337 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1338 int peer_version)
1339 {
1340 struct eap_fast_data *data = priv;
1341
1342 data->peer_version = peer_version;
1343
1344 if (data->force_version >= 0 && peer_version != data->force_version) {
1345 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1346 " version (forced=%d peer=%d) - reject",
1347 data->force_version, peer_version);
1348 return -1;
1349 }
1350
1351 if (peer_version < data->fast_version) {
1352 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1353 "use version %d",
1354 peer_version, data->fast_version, peer_version);
1355 data->fast_version = peer_version;
1356 }
1357
1358 return 0;
1359 }
1360
1361
1362 static int eap_fast_process_phase1(struct eap_sm *sm,
1363 struct eap_fast_data *data)
1364 {
1365 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1366 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1367 eap_fast_state(data, FAILURE);
1368 return -1;
1369 }
1370
1371 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1372 wpabuf_len(data->ssl.out_buf) > 0)
1373 return 1;
1374
1375 /*
1376 * Phase 1 was completed with the received message (e.g., when using
1377 * abbreviated handshake), so Phase 2 can be started immediately
1378 * without having to send through an empty message to the peer.
1379 */
1380
1381 return eap_fast_phase1_done(sm, data);
1382 }
1383
1384
1385 static void eap_fast_process_phase2_start(struct eap_sm *sm,
1386 struct eap_fast_data *data)
1387 {
1388 u8 next_type;
1389
1390 if (data->identity) {
1391 os_free(sm->identity);
1392 sm->identity = data->identity;
1393 data->identity = NULL;
1394 sm->identity_len = data->identity_len;
1395 data->identity_len = 0;
1396 sm->require_identity_match = 1;
1397 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1398 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1399 "Phase2 Identity not found "
1400 "in the user database",
1401 sm->identity, sm->identity_len);
1402 next_type = eap_fast_req_failure(sm, data);
1403 } else {
1404 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1405 "known - skip Phase 2 Identity Request");
1406 next_type = sm->user->methods[0].method;
1407 sm->user_eap_method_index = 1;
1408 }
1409
1410 eap_fast_state(data, PHASE2_METHOD);
1411 } else {
1412 eap_fast_state(data, PHASE2_ID);
1413 next_type = EAP_TYPE_IDENTITY;
1414 }
1415
1416 eap_fast_phase2_init(sm, data, next_type);
1417 }
1418
1419
1420 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1421 const struct wpabuf *respData)
1422 {
1423 struct eap_fast_data *data = priv;
1424
1425 switch (data->state) {
1426 case PHASE1:
1427 if (eap_fast_process_phase1(sm, data))
1428 break;
1429
1430 /* fall through to PHASE2_START */
1431 case PHASE2_START:
1432 eap_fast_process_phase2_start(sm, data);
1433 break;
1434 case PHASE2_ID:
1435 case PHASE2_METHOD:
1436 case CRYPTO_BINDING:
1437 case REQUEST_PAC:
1438 eap_fast_process_phase2(sm, data, data->ssl.in_buf);
1439 break;
1440 default:
1441 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1442 data->state, __func__);
1443 break;
1444 }
1445 }
1446
1447
1448 static void eap_fast_process(struct eap_sm *sm, void *priv,
1449 struct wpabuf *respData)
1450 {
1451 struct eap_fast_data *data = priv;
1452 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1453 EAP_TYPE_FAST, eap_fast_process_version,
1454 eap_fast_process_msg) < 0)
1455 eap_fast_state(data, FAILURE);
1456 }
1457
1458
1459 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1460 {
1461 struct eap_fast_data *data = priv;
1462 return data->state == SUCCESS || data->state == FAILURE;
1463 }
1464
1465
1466 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1467 {
1468 struct eap_fast_data *data = priv;
1469 u8 *eapKeyData;
1470
1471 if (data->state != SUCCESS)
1472 return NULL;
1473
1474 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1475 if (eapKeyData == NULL)
1476 return NULL;
1477
1478 eap_fast_derive_eap_msk(data->simck, eapKeyData);
1479 *len = EAP_FAST_KEY_LEN;
1480
1481 return eapKeyData;
1482 }
1483
1484
1485 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1486 {
1487 struct eap_fast_data *data = priv;
1488 u8 *eapKeyData;
1489
1490 if (data->state != SUCCESS)
1491 return NULL;
1492
1493 eapKeyData = os_malloc(EAP_EMSK_LEN);
1494 if (eapKeyData == NULL)
1495 return NULL;
1496
1497 eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1498 *len = EAP_EMSK_LEN;
1499
1500 return eapKeyData;
1501 }
1502
1503
1504 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1505 {
1506 struct eap_fast_data *data = priv;
1507 return data->state == SUCCESS;
1508 }
1509
1510
1511 int eap_server_fast_register(void)
1512 {
1513 struct eap_method *eap;
1514 int ret;
1515
1516 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1517 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1518 if (eap == NULL)
1519 return -1;
1520
1521 eap->init = eap_fast_init;
1522 eap->reset = eap_fast_reset;
1523 eap->buildReq = eap_fast_buildReq;
1524 eap->check = eap_fast_check;
1525 eap->process = eap_fast_process;
1526 eap->isDone = eap_fast_isDone;
1527 eap->getKey = eap_fast_getKey;
1528 eap->get_emsk = eap_fast_get_emsk;
1529 eap->isSuccess = eap_fast_isSuccess;
1530
1531 ret = eap_server_method_register(eap);
1532 if (ret)
1533 eap_server_method_free(eap);
1534 return ret;
1535 }
NetBSD on the FriendlyARM MINI2440