Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / eap_server / eap_server_fast.c
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1/*
2 * EAP-FAST server (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
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5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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7 */
8
9#include "includes.h"
10
11#include "common.h"
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12#include "crypto/aes_wrap.h"
13#include "crypto/sha1.h"
14#include "crypto/tls.h"
15#include "crypto/random.h"
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16#include "eap_common/eap_tlv_common.h"
17#include "eap_common/eap_fast_common.h"
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18#include "eap_i.h"
19#include "eap_tls_common.h"
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20
21
22static void eap_fast_reset(struct eap_sm *sm, void *priv);
23
24
25/* Private PAC-Opaque TLV types */
26#define PAC_OPAQUE_TYPE_PAD 0
27#define PAC_OPAQUE_TYPE_KEY 1
28#define PAC_OPAQUE_TYPE_LIFETIME 2
29#define PAC_OPAQUE_TYPE_IDENTITY 3
30
31struct eap_fast_data {
32 struct eap_ssl_data ssl;
33 enum {
34 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
35 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
36 } state;
37
38 int fast_version;
39 const struct eap_method *phase2_method;
40 void *phase2_priv;
41 int force_version;
42 int peer_version;
43
44 u8 crypto_binding_nonce[32];
45 int final_result;
46
47 struct eap_fast_key_block_provisioning *key_block_p;
48
49 u8 simck[EAP_FAST_SIMCK_LEN];
50 u8 cmk[EAP_FAST_CMK_LEN];
51 int simck_idx;
52
53 u8 pac_opaque_encr[16];
54 u8 *srv_id;
55 size_t srv_id_len;
56 char *srv_id_info;
57
58 int anon_provisioning;
59 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
60 struct wpabuf *pending_phase2_resp;
61 u8 *identity; /* from PAC-Opaque */
62 size_t identity_len;
63 int eap_seq;
64 int tnc_started;
65
66 int pac_key_lifetime;
67 int pac_key_refresh_time;
68};
69
70
71static int eap_fast_process_phase2_start(struct eap_sm *sm,
72 struct eap_fast_data *data);
73
74
75static const char * eap_fast_state_txt(int state)
76{
77 switch (state) {
78 case START:
79 return "START";
80 case PHASE1:
81 return "PHASE1";
82 case PHASE2_START:
83 return "PHASE2_START";
84 case PHASE2_ID:
85 return "PHASE2_ID";
86 case PHASE2_METHOD:
87 return "PHASE2_METHOD";
88 case CRYPTO_BINDING:
89 return "CRYPTO_BINDING";
90 case REQUEST_PAC:
91 return "REQUEST_PAC";
92 case SUCCESS:
93 return "SUCCESS";
94 case FAILURE:
95 return "FAILURE";
96 default:
97 return "Unknown?!";
98 }
99}
100
101
102static void eap_fast_state(struct eap_fast_data *data, int state)
103{
104 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105 eap_fast_state_txt(data->state),
106 eap_fast_state_txt(state));
107 data->state = state;
108}
109
110
111static EapType eap_fast_req_failure(struct eap_sm *sm,
112 struct eap_fast_data *data)
113{
114 /* TODO: send Result TLV(FAILURE) */
115 eap_fast_state(data, FAILURE);
116 return EAP_TYPE_NONE;
117}
118
119
120static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
121 const u8 *client_random,
122 const u8 *server_random,
123 u8 *master_secret)
124{
125 struct eap_fast_data *data = ctx;
126 const u8 *pac_opaque;
127 size_t pac_opaque_len;
128 u8 *buf, *pos, *end, *pac_key = NULL;
129 os_time_t lifetime = 0;
130 struct os_time now;
131 u8 *identity = NULL;
132 size_t identity_len = 0;
133
134 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136 ticket, len);
137
138 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140 "SessionTicket");
141 return 0;
142 }
143
144 pac_opaque_len = WPA_GET_BE16(ticket + 2);
145 pac_opaque = ticket + 4;
146 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147 pac_opaque_len > len - 4) {
148 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
149 "(len=%lu left=%lu)",
150 (unsigned long) pac_opaque_len,
151 (unsigned long) len);
152 return 0;
153 }
154 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155 pac_opaque, pac_opaque_len);
156
157 buf = os_malloc(pac_opaque_len - 8);
158 if (buf == NULL) {
159 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
160 "for decrypting PAC-Opaque");
161 return 0;
162 }
163
164 if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
165 pac_opaque, buf) < 0) {
166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167 "PAC-Opaque");
168 os_free(buf);
169 /*
170 * This may have been caused by server changing the PAC-Opaque
171 * encryption key, so just ignore this PAC-Opaque instead of
172 * failing the authentication completely. Provisioning can now
173 * be used to provision a new PAC.
174 */
175 return 0;
176 }
177
178 end = buf + pac_opaque_len - 8;
179 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 buf, end - buf);
181
182 pos = buf;
183 while (pos + 1 < end) {
184 if (pos + 2 + pos[1] > end)
185 break;
186
187 switch (*pos) {
188 case PAC_OPAQUE_TYPE_PAD:
189 pos = end;
190 break;
191 case PAC_OPAQUE_TYPE_KEY:
192 if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
193 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
194 "PAC-Key length %d", pos[1]);
195 os_free(buf);
196 return -1;
197 }
198 pac_key = pos + 2;
199 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
200 "decrypted PAC-Opaque",
201 pac_key, EAP_FAST_PAC_KEY_LEN);
202 break;
203 case PAC_OPAQUE_TYPE_LIFETIME:
204 if (pos[1] != 4) {
205 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
206 "PAC-Key lifetime length %d",
207 pos[1]);
208 os_free(buf);
209 return -1;
210 }
211 lifetime = WPA_GET_BE32(pos + 2);
212 break;
213 case PAC_OPAQUE_TYPE_IDENTITY:
214 identity = pos + 2;
215 identity_len = pos[1];
216 break;
217 }
218
219 pos += 2 + pos[1];
220 }
221
222 if (pac_key == NULL) {
223 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
224 "PAC-Opaque");
225 os_free(buf);
226 return -1;
227 }
228
229 if (identity) {
230 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
231 "PAC-Opaque", identity, identity_len);
232 os_free(data->identity);
233 data->identity = os_malloc(identity_len);
234 if (data->identity) {
235 os_memcpy(data->identity, identity, identity_len);
236 data->identity_len = identity_len;
237 }
238 }
239
240 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
241 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
242 "(lifetime=%ld now=%ld)", lifetime, now.sec);
243 data->send_new_pac = 2;
244 /*
245 * Allow PAC to be used to allow a PAC update with some level
246 * of server authentication (i.e., do not fall back to full TLS
247 * handshake since we cannot be sure that the peer would be
248 * able to validate server certificate now). However, reject
249 * the authentication since the PAC was not valid anymore. Peer
250 * can connect again with the newly provisioned PAC after this.
251 */
252 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
253 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
254 "an update if authentication succeeds");
255 data->send_new_pac = 1;
256 }
257
258 eap_fast_derive_master_secret(pac_key, server_random, client_random,
259 master_secret);
260
261 os_free(buf);
262
263 return 1;
264}
265
266
267static void eap_fast_derive_key_auth(struct eap_sm *sm,
268 struct eap_fast_data *data)
269{
270 u8 *sks;
271
272 /* RFC 4851, Section 5.1:
273 * Extra key material after TLS key_block: session_key_seed[40]
274 */
275
276 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
277 EAP_FAST_SKS_LEN);
278 if (sks == NULL) {
279 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
280 "session_key_seed");
281 return;
282 }
283
284 /*
285 * RFC 4851, Section 5.2:
286 * S-IMCK[0] = session_key_seed
287 */
288 wpa_hexdump_key(MSG_DEBUG,
289 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
290 sks, EAP_FAST_SKS_LEN);
291 data->simck_idx = 0;
292 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
293 os_free(sks);
294}
295
296
297static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
298 struct eap_fast_data *data)
299{
300 os_free(data->key_block_p);
301 data->key_block_p = (struct eap_fast_key_block_provisioning *)
302 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
303 "key expansion",
304 sizeof(*data->key_block_p));
305 if (data->key_block_p == NULL) {
306 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
307 return;
308 }
309 /*
310 * RFC 4851, Section 5.2:
311 * S-IMCK[0] = session_key_seed
312 */
313 wpa_hexdump_key(MSG_DEBUG,
314 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
315 data->key_block_p->session_key_seed,
316 sizeof(data->key_block_p->session_key_seed));
317 data->simck_idx = 0;
318 os_memcpy(data->simck, data->key_block_p->session_key_seed,
319 EAP_FAST_SIMCK_LEN);
320 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
321 data->key_block_p->server_challenge,
322 sizeof(data->key_block_p->server_challenge));
323 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
324 data->key_block_p->client_challenge,
325 sizeof(data->key_block_p->client_challenge));
326}
327
328
329static int eap_fast_get_phase2_key(struct eap_sm *sm,
330 struct eap_fast_data *data,
331 u8 *isk, size_t isk_len)
332{
333 u8 *key;
334 size_t key_len;
335
336 os_memset(isk, 0, isk_len);
337
338 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
339 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
340 "available");
341 return -1;
342 }
343
344 if (data->phase2_method->getKey == NULL)
345 return 0;
346
347 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
348 &key_len)) == NULL) {
349 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
350 "from Phase 2");
351 return -1;
352 }
353
354 if (key_len > isk_len)
355 key_len = isk_len;
356 if (key_len == 32 &&
357 data->phase2_method->vendor == EAP_VENDOR_IETF &&
358 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
359 /*
360 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
361 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
362 * ISK for EAP-FAST cryptobinding.
363 */
364 os_memcpy(isk, key + 16, 16);
365 os_memcpy(isk + 16, key, 16);
366 } else
367 os_memcpy(isk, key, key_len);
368 os_free(key);
369
370 return 0;
371}
372
373
374static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
375{
376 u8 isk[32], imck[60];
377
378 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
379 data->simck_idx + 1);
380
381 /*
382 * RFC 4851, Section 5.2:
383 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
384 * MSK[j], 60)
385 * S-IMCK[j] = first 40 octets of IMCK[j]
386 * CMK[j] = last 20 octets of IMCK[j]
387 */
388
389 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
390 return -1;
391 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
392 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
393 "Inner Methods Compound Keys",
394 isk, sizeof(isk), imck, sizeof(imck));
395 data->simck_idx++;
396 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
397 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
398 data->simck, EAP_FAST_SIMCK_LEN);
399 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
400 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
401 data->cmk, EAP_FAST_CMK_LEN);
402
403 return 0;
404}
405
406
407static void * eap_fast_init(struct eap_sm *sm)
408{
409 struct eap_fast_data *data;
410 u8 ciphers[5] = {
411 TLS_CIPHER_ANON_DH_AES128_SHA,
412 TLS_CIPHER_AES128_SHA,
413 TLS_CIPHER_RSA_DHE_AES128_SHA,
414 TLS_CIPHER_RC4_SHA,
415 TLS_CIPHER_NONE
416 };
417
418 data = os_zalloc(sizeof(*data));
419 if (data == NULL)
420 return NULL;
421 data->fast_version = EAP_FAST_VERSION;
422 data->force_version = -1;
423 if (sm->user && sm->user->force_version >= 0) {
424 data->force_version = sm->user->force_version;
425 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
426 data->force_version);
427 data->fast_version = data->force_version;
428 }
429 data->state = START;
430
431 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
432 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
433 eap_fast_reset(sm, data);
434 return NULL;
435 }
436
437 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
438 ciphers) < 0) {
439 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
440 "suites");
441 eap_fast_reset(sm, data);
442 return NULL;
443 }
444
445 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
446 eap_fast_session_ticket_cb,
447 data) < 0) {
448 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
449 "callback");
450 eap_fast_reset(sm, data);
451 return NULL;
452 }
453
454 if (sm->pac_opaque_encr_key == NULL) {
455 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
456 "configured");
457 eap_fast_reset(sm, data);
458 return NULL;
459 }
460 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
461 sizeof(data->pac_opaque_encr));
462
463 if (sm->eap_fast_a_id == NULL) {
464 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
465 eap_fast_reset(sm, data);
466 return NULL;
467 }
468 data->srv_id = os_malloc(sm->eap_fast_a_id_len);
469 if (data->srv_id == NULL) {
470 eap_fast_reset(sm, data);
471 return NULL;
472 }
473 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
474 data->srv_id_len = sm->eap_fast_a_id_len;
475
476 if (sm->eap_fast_a_id_info == NULL) {
477 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
478 eap_fast_reset(sm, data);
479 return NULL;
480 }
481 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
482 if (data->srv_id_info == NULL) {
483 eap_fast_reset(sm, data);
484 return NULL;
485 }
486
487 /* PAC-Key lifetime in seconds (hard limit) */
488 data->pac_key_lifetime = sm->pac_key_lifetime;
489
490 /*
491 * PAC-Key refresh time in seconds (soft limit on remaining hard
492 * limit). The server will generate a new PAC-Key when this number of
493 * seconds (or fewer) of the lifetime remains.
494 */
495 data->pac_key_refresh_time = sm->pac_key_refresh_time;
496
497 return data;
498}
499
500
501static void eap_fast_reset(struct eap_sm *sm, void *priv)
502{
503 struct eap_fast_data *data = priv;
504 if (data == NULL)
505 return;
506 if (data->phase2_priv && data->phase2_method)
507 data->phase2_method->reset(sm, data->phase2_priv);
508 eap_server_tls_ssl_deinit(sm, &data->ssl);
509 os_free(data->srv_id);
510 os_free(data->srv_id_info);
511 os_free(data->key_block_p);
512 wpabuf_free(data->pending_phase2_resp);
513 os_free(data->identity);
514 os_free(data);
515}
516
517
518static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
519 struct eap_fast_data *data, u8 id)
520{
521 struct wpabuf *req;
522
523 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
524 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
525 EAP_CODE_REQUEST, id);
526 if (req == NULL) {
527 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
528 " request");
529 eap_fast_state(data, FAILURE);
530 return NULL;
531 }
532
533 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
534
535 /* RFC 4851, 4.1.1. Authority ID Data */
536 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
537
538 eap_fast_state(data, PHASE1);
539
540 return req;
541}
542
543
544static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
545{
546 char cipher[64];
547
548 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
549
550 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
551 < 0) {
552 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
553 "information");
554 eap_fast_state(data, FAILURE);
555 return -1;
556 }
557 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
558
559 if (data->anon_provisioning) {
560 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
561 eap_fast_derive_key_provisioning(sm, data);
562 } else
563 eap_fast_derive_key_auth(sm, data);
564
565 eap_fast_state(data, PHASE2_START);
566
567 return 0;
568}
569
570
571static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
572 struct eap_fast_data *data,
573 u8 id)
574{
575 struct wpabuf *req;
576
577 if (data->phase2_priv == NULL) {
578 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
579 "initialized");
580 return NULL;
581 }
582 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
583 if (req == NULL)
584 return NULL;
585
586 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
587 return eap_fast_tlv_eap_payload(req);
588}
589
590
591static struct wpabuf * eap_fast_build_crypto_binding(
592 struct eap_sm *sm, struct eap_fast_data *data)
593{
594 struct wpabuf *buf;
595 struct eap_tlv_result_tlv *result;
596 struct eap_tlv_crypto_binding_tlv *binding;
597
598 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
599 if (buf == NULL)
600 return NULL;
601
602 if (data->send_new_pac || data->anon_provisioning ||
603 data->phase2_method)
604 data->final_result = 0;
605 else
606 data->final_result = 1;
607
608 if (!data->final_result || data->eap_seq > 1) {
609 /* Intermediate-Result */
610 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
611 "(status=SUCCESS)");
612 result = wpabuf_put(buf, sizeof(*result));
613 result->tlv_type = host_to_be16(
614 EAP_TLV_TYPE_MANDATORY |
615 EAP_TLV_INTERMEDIATE_RESULT_TLV);
616 result->length = host_to_be16(2);
617 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
618 }
619
620 if (data->final_result) {
621 /* Result TLV */
622 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
623 "(status=SUCCESS)");
624 result = wpabuf_put(buf, sizeof(*result));
625 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
626 EAP_TLV_RESULT_TLV);
627 result->length = host_to_be16(2);
628 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
629 }
630
631 /* Crypto-Binding TLV */
632 binding = wpabuf_put(buf, sizeof(*binding));
633 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
634 EAP_TLV_CRYPTO_BINDING_TLV);
635 binding->length = host_to_be16(sizeof(*binding) -
636 sizeof(struct eap_tlv_hdr));
637 binding->version = EAP_FAST_VERSION;
638 binding->received_version = data->peer_version;
639 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
4781064b 640 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
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641 wpabuf_free(buf);
642 return NULL;
643 }
644
645 /*
646 * RFC 4851, Section 4.2.8:
647 * The nonce in a request MUST have its least significant bit set to 0.
648 */
649 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
650
651 os_memcpy(data->crypto_binding_nonce, binding->nonce,
652 sizeof(binding->nonce));
653
654 /*
655 * RFC 4851, Section 5.3:
656 * CMK = CMK[j]
657 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
658 */
659
660 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
661 (u8 *) binding, sizeof(*binding),
662 binding->compound_mac);
663
664 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
665 "Received Version %d SubType %d",
666 binding->version, binding->received_version,
667 binding->subtype);
668 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
669 binding->nonce, sizeof(binding->nonce));
670 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
671 binding->compound_mac, sizeof(binding->compound_mac));
672
673 return buf;
674}
675
676
677static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
678 struct eap_fast_data *data)
679{
680 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
681 u8 *pac_buf, *pac_opaque;
682 struct wpabuf *buf;
683 u8 *pos;
684 size_t buf_len, srv_id_info_len, pac_len;
685 struct eap_tlv_hdr *pac_tlv;
686 struct pac_tlv_hdr *pac_info;
687 struct eap_tlv_result_tlv *result;
688 struct os_time now;
689
4781064b 690 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
a875087d
JL
691 os_get_time(&now) < 0)
692 return NULL;
693 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
694 pac_key, EAP_FAST_PAC_KEY_LEN);
695
696 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
697 (2 + sm->identity_len) + 8;
698 pac_buf = os_malloc(pac_len);
699 if (pac_buf == NULL)
700 return NULL;
701
702 srv_id_info_len = os_strlen(data->srv_id_info);
703
704 pos = pac_buf;
705 *pos++ = PAC_OPAQUE_TYPE_KEY;
706 *pos++ = EAP_FAST_PAC_KEY_LEN;
707 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
708 pos += EAP_FAST_PAC_KEY_LEN;
709
710 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
711 *pos++ = 4;
712 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
713 pos += 4;
714
715 if (sm->identity) {
716 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
717 *pos++ = sm->identity_len;
718 os_memcpy(pos, sm->identity, sm->identity_len);
719 pos += sm->identity_len;
720 }
721
722 pac_len = pos - pac_buf;
723 while (pac_len % 8) {
724 *pos++ = PAC_OPAQUE_TYPE_PAD;
725 pac_len++;
726 }
727
728 pac_opaque = os_malloc(pac_len + 8);
729 if (pac_opaque == NULL) {
730 os_free(pac_buf);
731 return NULL;
732 }
733 if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
734 pac_opaque) < 0) {
735 os_free(pac_buf);
736 os_free(pac_opaque);
737 return NULL;
738 }
739 os_free(pac_buf);
740
741 pac_len += 8;
742 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
743 pac_opaque, pac_len);
744
745 buf_len = sizeof(*pac_tlv) +
746 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
747 sizeof(struct pac_tlv_hdr) + pac_len +
748 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
749 buf = wpabuf_alloc(buf_len);
750 if (buf == NULL) {
751 os_free(pac_opaque);
752 return NULL;
753 }
754
755 /* Result TLV */
756 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
757 result = wpabuf_put(buf, sizeof(*result));
758 WPA_PUT_BE16((u8 *) &result->tlv_type,
759 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
760 WPA_PUT_BE16((u8 *) &result->length, 2);
761 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
762
763 /* PAC TLV */
764 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
765 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
766 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
767 EAP_TLV_PAC_TLV);
768
769 /* PAC-Key */
770 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
771
772 /* PAC-Opaque */
773 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
774 os_free(pac_opaque);
775
776 /* PAC-Info */
777 pac_info = wpabuf_put(buf, sizeof(*pac_info));
778 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
779
780 /* PAC-Lifetime (inside PAC-Info) */
781 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
782 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
783
784 /* A-ID (inside PAC-Info) */
785 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
786
787 /* Note: headers may be misaligned after A-ID */
788
4781064b
JM
789 if (sm->identity) {
790 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
791 sm->identity_len);
792 }
793
a875087d
JL
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
811static 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);
4781064b 819 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
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820 wpabuf_free(plain);
821
4781064b 822 if (data->ssl.tls_out && piggyback) {
a875087d
JL
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),
4781064b
JM
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) {
a875087d
JL
830 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
831 "output buffer");
832 wpabuf_free(encr);
833 return -1;
834 }
4781064b 835 wpabuf_put_buf(data->ssl.tls_out, encr);
a875087d
JL
836 wpabuf_free(encr);
837 } else {
4781064b
JM
838 wpabuf_free(data->ssl.tls_out);
839 data->ssl.tls_out_pos = 0;
840 data->ssl.tls_out = encr;
a875087d
JL
841 }
842
843 return 0;
844}
845
846
847static 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
921static 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
937static 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
964static 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);
4781064b 989#ifdef EAP_SERVER_TNC
a875087d
JL
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 }
4781064b 998#endif /* EAP_SERVER_TNC */
a875087d
JL
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;
4781064b 1066#ifdef EAP_SERVER_TNC
a875087d
JL
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 }
4781064b 1072#endif /* EAP_SERVER_TNC */
a875087d
JL
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
1086static 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
4781064b 1123static int eap_fast_parse_tlvs(struct wpabuf *data,
a875087d
JL
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
4781064b
JM
1131 pos = wpabuf_mhead(data);
1132 end = pos + wpabuf_len(data);
a875087d
JL
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
1170static 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
1226static 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
1241static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1242 struct eap_fast_data *data,
4781064b 1243 struct wpabuf *in_data)
a875087d
JL
1244{
1245 struct eap_fast_tlv_parse tlv;
1246 int check_crypto_binding = data->state == CRYPTO_BINDING;
1247
4781064b 1248 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
a875087d
JL
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
1371static void eap_fast_process_phase2(struct eap_sm *sm,
1372 struct eap_fast_data *data,
1373 struct wpabuf *in_buf)
1374{
4781064b 1375 struct wpabuf *in_decrypted;
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JL
1376
1377 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
4781064b 1378 " Phase 2", (unsigned long) wpabuf_len(in_buf));
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JL
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");
4781064b
JM
1383 eap_fast_process_phase2_tlvs(sm, data,
1384 data->pending_phase2_resp);
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1385 wpabuf_free(data->pending_phase2_resp);
1386 data->pending_phase2_resp = NULL;
1387 return;
1388 }
1389
4781064b
JM
1390 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1391 in_buf);
a875087d 1392 if (in_decrypted == NULL) {
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JL
1393 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1394 "data");
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JL
1395 eap_fast_state(data, FAILURE);
1396 return;
1397 }
1398
4781064b
JM
1399 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1400 in_decrypted);
a875087d 1401
4781064b 1402 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
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JL
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);
4781064b
JM
1408 data->pending_phase2_resp = in_decrypted;
1409 return;
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1410 }
1411
4781064b 1412 wpabuf_free(in_decrypted);
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1413}
1414
1415
1416static 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
1441static 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) ||
4781064b 1451 wpabuf_len(data->ssl.tls_out) > 0)
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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
1464static 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
1499static 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:
4781064b 1517 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
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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
1527static 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
1538static 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
1545static 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
1564static 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
1583static 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
1590int 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}