1 /*
2 * EAP-FAST server (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/sha1.h"
14 #include "crypto/tls.h"
15 #include "crypto/random.h"
16 #include "eap_common/eap_tlv_common.h"
17 #include "eap_common/eap_fast_common.h"
18 #include "eap_i.h"
19 #include "eap_tls_common.h"
20
21
22 static void eap_fast_reset(struct eap_sm *sm, void *priv);
23
24
25 /* Private PAC-Opaque TLV types */
26 #define PAC_OPAQUE_TYPE_PAD 0
27 #define PAC_OPAQUE_TYPE_KEY 1
28 #define PAC_OPAQUE_TYPE_LIFETIME 2
29 #define PAC_OPAQUE_TYPE_IDENTITY 3
30
31 struct eap_fast_data {
32 struct eap_ssl_data ssl;
33 enum {
34 START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
35 CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
36 } state;
37
38 int fast_version;
39 const struct eap_method *phase2_method;
40 void *phase2_priv;
41 int force_version;
42 int peer_version;
43
44 u8 crypto_binding_nonce[32];
45 int final_result;
46
47 struct eap_fast_key_block_provisioning *key_block_p;
48
49 u8 simck[EAP_FAST_SIMCK_LEN];
50 u8 cmk[EAP_FAST_CMK_LEN];
51 int simck_idx;
52
53 u8 pac_opaque_encr[16];
54 u8 *srv_id;
55 size_t srv_id_len;
56 char *srv_id_info;
57
58 int anon_provisioning;
59 int send_new_pac; /* server triggered re-keying of Tunnel PAC */
60 struct wpabuf *pending_phase2_resp;
61 u8 *identity; /* from PAC-Opaque */
62 size_t identity_len;
63 int eap_seq;
64 int tnc_started;
65
66 int pac_key_lifetime;
67 int pac_key_refresh_time;
68 };
69
70
71 static int eap_fast_process_phase2_start(struct eap_sm *sm,
72 struct eap_fast_data *data);
73
74
eap_fast_state_txt(int state)75 static const char * eap_fast_state_txt(int state)
76 {
77 switch (state) {
78 case START:
79 return "START";
80 case PHASE1:
81 return "PHASE1";
82 case PHASE2_START:
83 return "PHASE2_START";
84 case PHASE2_ID:
85 return "PHASE2_ID";
86 case PHASE2_METHOD:
87 return "PHASE2_METHOD";
88 case CRYPTO_BINDING:
89 return "CRYPTO_BINDING";
90 case REQUEST_PAC:
91 return "REQUEST_PAC";
92 case SUCCESS:
93 return "SUCCESS";
94 case FAILURE:
95 return "FAILURE";
96 default:
97 return "Unknown?!";
98 }
99 }
100
101
eap_fast_state(struct eap_fast_data * data,int state)102 static void eap_fast_state(struct eap_fast_data *data, int state)
103 {
104 wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105 eap_fast_state_txt(data->state),
106 eap_fast_state_txt(state));
107 data->state = state;
108 }
109
110
eap_fast_req_failure(struct eap_sm * sm,struct eap_fast_data * data)111 static 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
eap_fast_session_ticket_cb(void * ctx,const u8 * ticket,size_t len,const u8 * client_random,const u8 * server_random,u8 * master_secret)120 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
121 const u8 *client_random,
122 const u8 *server_random,
123 u8 *master_secret)
124 {
125 struct eap_fast_data *data = ctx;
126 const u8 *pac_opaque;
127 size_t pac_opaque_len;
128 u8 *buf, *pos, *end, *pac_key = NULL;
129 os_time_t lifetime = 0;
130 struct os_time now;
131 u8 *identity = NULL;
132 size_t identity_len = 0;
133
134 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136 ticket, len);
137
138 if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140 "SessionTicket");
141 return 0;
142 }
143
144 pac_opaque_len = WPA_GET_BE16(ticket + 2);
145 pac_opaque = ticket + 4;
146 if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147 pac_opaque_len > len - 4) {
148 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
149 "(len=%lu left=%lu)",
150 (unsigned long) pac_opaque_len,
151 (unsigned long) len);
152 return 0;
153 }
154 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155 pac_opaque, pac_opaque_len);
156
157 buf = os_malloc(pac_opaque_len - 8);
158 if (buf == NULL) {
159 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
160 "for decrypting PAC-Opaque");
161 return 0;
162 }
163
164 if (aes_unwrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
165 (pac_opaque_len - 8) / 8, pac_opaque, buf) < 0) {
166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167 "PAC-Opaque");
168 os_free(buf);
169 /*
170 * This may have been caused by server changing the PAC-Opaque
171 * encryption key, so just ignore this PAC-Opaque instead of
172 * failing the authentication completely. Provisioning can now
173 * be used to provision a new PAC.
174 */
175 return 0;
176 }
177
178 end = buf + pac_opaque_len - 8;
179 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 buf, end - buf);
181
182 pos = buf;
183 while (end - pos > 1) {
184 u8 id, elen;
185
186 id = *pos++;
187 elen = *pos++;
188 if (elen > end - pos)
189 break;
190
191 switch (id) {
192 case PAC_OPAQUE_TYPE_PAD:
193 goto done;
194 case PAC_OPAQUE_TYPE_KEY:
195 if (elen != EAP_FAST_PAC_KEY_LEN) {
196 wpa_printf(MSG_DEBUG,
197 "EAP-FAST: Invalid PAC-Key length %d",
198 elen);
199 os_free(buf);
200 return -1;
201 }
202 pac_key = pos;
203 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
204 "decrypted PAC-Opaque",
205 pac_key, EAP_FAST_PAC_KEY_LEN);
206 break;
207 case PAC_OPAQUE_TYPE_LIFETIME:
208 if (elen != 4) {
209 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
210 "PAC-Key lifetime length %d",
211 elen);
212 os_free(buf);
213 return -1;
214 }
215 lifetime = WPA_GET_BE32(pos);
216 break;
217 case PAC_OPAQUE_TYPE_IDENTITY:
218 identity = pos;
219 identity_len = elen;
220 break;
221 }
222
223 pos += elen;
224 }
225 done:
226
227 if (pac_key == NULL) {
228 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
229 "PAC-Opaque");
230 os_free(buf);
231 return -1;
232 }
233
234 if (identity) {
235 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
236 "PAC-Opaque", identity, identity_len);
237 os_free(data->identity);
238 data->identity = os_malloc(identity_len);
239 if (data->identity) {
240 os_memcpy(data->identity, identity, identity_len);
241 data->identity_len = identity_len;
242 }
243 }
244
245 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
246 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
247 "(lifetime=%ld now=%ld)", lifetime, now.sec);
248 data->send_new_pac = 2;
249 /*
250 * Allow PAC to be used to allow a PAC update with some level
251 * of server authentication (i.e., do not fall back to full TLS
252 * handshake since we cannot be sure that the peer would be
253 * able to validate server certificate now). However, reject
254 * the authentication since the PAC was not valid anymore. Peer
255 * can connect again with the newly provisioned PAC after this.
256 */
257 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
258 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
259 "an update if authentication succeeds");
260 data->send_new_pac = 1;
261 }
262
263 eap_fast_derive_master_secret(pac_key, server_random, client_random,
264 master_secret);
265
266 os_free(buf);
267
268 return 1;
269 }
270
271
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)272 static void eap_fast_derive_key_auth(struct eap_sm *sm,
273 struct eap_fast_data *data)
274 {
275 u8 *sks;
276
277 /* RFC 4851, Section 5.1:
278 * Extra key material after TLS key_block: session_key_seed[40]
279 */
280
281 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
282 EAP_FAST_SKS_LEN);
283 if (sks == NULL) {
284 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
285 "session_key_seed");
286 return;
287 }
288
289 /*
290 * RFC 4851, Section 5.2:
291 * S-IMCK[0] = session_key_seed
292 */
293 wpa_hexdump_key(MSG_DEBUG,
294 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
295 sks, EAP_FAST_SKS_LEN);
296 data->simck_idx = 0;
297 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
298 os_free(sks);
299 }
300
301
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)302 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
303 struct eap_fast_data *data)
304 {
305 os_free(data->key_block_p);
306 data->key_block_p = (struct eap_fast_key_block_provisioning *)
307 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
308 sizeof(*data->key_block_p));
309 if (data->key_block_p == NULL) {
310 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
311 return;
312 }
313 /*
314 * RFC 4851, Section 5.2:
315 * S-IMCK[0] = session_key_seed
316 */
317 wpa_hexdump_key(MSG_DEBUG,
318 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
319 data->key_block_p->session_key_seed,
320 sizeof(data->key_block_p->session_key_seed));
321 data->simck_idx = 0;
322 os_memcpy(data->simck, data->key_block_p->session_key_seed,
323 EAP_FAST_SIMCK_LEN);
324 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
325 data->key_block_p->server_challenge,
326 sizeof(data->key_block_p->server_challenge));
327 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
328 data->key_block_p->client_challenge,
329 sizeof(data->key_block_p->client_challenge));
330 }
331
332
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)333 static int eap_fast_get_phase2_key(struct eap_sm *sm,
334 struct eap_fast_data *data,
335 u8 *isk, size_t isk_len)
336 {
337 u8 *key;
338 size_t key_len;
339
340 os_memset(isk, 0, isk_len);
341
342 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
343 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
344 "available");
345 return -1;
346 }
347
348 if (data->phase2_method->getKey == NULL)
349 return 0;
350
351 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
352 &key_len)) == NULL) {
353 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
354 "from Phase 2");
355 return -1;
356 }
357
358 if (key_len > isk_len)
359 key_len = isk_len;
360 if (key_len == 32 &&
361 data->phase2_method->vendor == EAP_VENDOR_IETF &&
362 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
363 /*
364 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
365 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
366 * ISK for EAP-FAST cryptobinding.
367 */
368 os_memcpy(isk, key + 16, 16);
369 os_memcpy(isk + 16, key, 16);
370 } else
371 os_memcpy(isk, key, key_len);
372 os_free(key);
373
374 return 0;
375 }
376
377
eap_fast_update_icmk(struct eap_sm * sm,struct eap_fast_data * data)378 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
379 {
380 u8 isk[32], imck[60];
381
382 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
383 data->simck_idx + 1);
384
385 /*
386 * RFC 4851, Section 5.2:
387 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
388 * MSK[j], 60)
389 * S-IMCK[j] = first 40 octets of IMCK[j]
390 * CMK[j] = last 20 octets of IMCK[j]
391 */
392
393 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
394 return -1;
395 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
396 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
397 "Inner Methods Compound Keys",
398 isk, sizeof(isk), imck, sizeof(imck));
399 data->simck_idx++;
400 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
401 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
402 data->simck, EAP_FAST_SIMCK_LEN);
403 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
404 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
405 data->cmk, EAP_FAST_CMK_LEN);
406
407 return 0;
408 }
409
410
eap_fast_init(struct eap_sm * sm)411 static void * eap_fast_init(struct eap_sm *sm)
412 {
413 struct eap_fast_data *data;
414 u8 ciphers[7] = {
415 TLS_CIPHER_ANON_DH_AES128_SHA,
416 TLS_CIPHER_AES128_SHA,
417 TLS_CIPHER_RSA_DHE_AES128_SHA,
418 TLS_CIPHER_RC4_SHA,
419 TLS_CIPHER_RSA_DHE_AES256_SHA,
420 TLS_CIPHER_AES256_SHA,
421 TLS_CIPHER_NONE
422 };
423
424 data = os_zalloc(sizeof(*data));
425 if (data == NULL)
426 return NULL;
427 data->fast_version = EAP_FAST_VERSION;
428 data->force_version = -1;
429 if (sm->user && sm->user->force_version >= 0) {
430 data->force_version = sm->user->force_version;
431 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
432 data->force_version);
433 data->fast_version = data->force_version;
434 }
435 data->state = START;
436
437 if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_FAST)) {
438 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
439 eap_fast_reset(sm, data);
440 return NULL;
441 }
442
443 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
444 ciphers) < 0) {
445 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
446 "suites");
447 eap_fast_reset(sm, data);
448 return NULL;
449 }
450
451 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
452 eap_fast_session_ticket_cb,
453 data) < 0) {
454 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
455 "callback");
456 eap_fast_reset(sm, data);
457 return NULL;
458 }
459
460 if (sm->pac_opaque_encr_key == NULL) {
461 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
462 "configured");
463 eap_fast_reset(sm, data);
464 return NULL;
465 }
466 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
467 sizeof(data->pac_opaque_encr));
468
469 if (sm->eap_fast_a_id == NULL) {
470 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
471 eap_fast_reset(sm, data);
472 return NULL;
473 }
474 data->srv_id = os_malloc(sm->eap_fast_a_id_len);
475 if (data->srv_id == NULL) {
476 eap_fast_reset(sm, data);
477 return NULL;
478 }
479 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
480 data->srv_id_len = sm->eap_fast_a_id_len;
481
482 if (sm->eap_fast_a_id_info == NULL) {
483 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
484 eap_fast_reset(sm, data);
485 return NULL;
486 }
487 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
488 if (data->srv_id_info == NULL) {
489 eap_fast_reset(sm, data);
490 return NULL;
491 }
492
493 /* PAC-Key lifetime in seconds (hard limit) */
494 data->pac_key_lifetime = sm->pac_key_lifetime;
495
496 /*
497 * PAC-Key refresh time in seconds (soft limit on remaining hard
498 * limit). The server will generate a new PAC-Key when this number of
499 * seconds (or fewer) of the lifetime remains.
500 */
501 data->pac_key_refresh_time = sm->pac_key_refresh_time;
502
503 return data;
504 }
505
506
eap_fast_reset(struct eap_sm * sm,void * priv)507 static void eap_fast_reset(struct eap_sm *sm, void *priv)
508 {
509 struct eap_fast_data *data = priv;
510 if (data == NULL)
511 return;
512 if (data->phase2_priv && data->phase2_method)
513 data->phase2_method->reset(sm, data->phase2_priv);
514 eap_server_tls_ssl_deinit(sm, &data->ssl);
515 os_free(data->srv_id);
516 os_free(data->srv_id_info);
517 os_free(data->key_block_p);
518 wpabuf_free(data->pending_phase2_resp);
519 os_free(data->identity);
520 bin_clear_free(data, sizeof(*data));
521 }
522
523
eap_fast_build_start(struct eap_sm * sm,struct eap_fast_data * data,u8 id)524 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
525 struct eap_fast_data *data, u8 id)
526 {
527 struct wpabuf *req;
528
529 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
530 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
531 EAP_CODE_REQUEST, id);
532 if (req == NULL) {
533 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
534 " request");
535 eap_fast_state(data, FAILURE);
536 return NULL;
537 }
538
539 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
540
541 /* RFC 4851, 4.1.1. Authority ID Data */
542 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
543
544 eap_fast_state(data, PHASE1);
545
546 return req;
547 }
548
549
eap_fast_phase1_done(struct eap_sm * sm,struct eap_fast_data * data)550 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
551 {
552 char cipher[64];
553
554 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
555
556 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
557 < 0) {
558 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
559 "information");
560 eap_fast_state(data, FAILURE);
561 return -1;
562 }
563 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
564
565 if (data->anon_provisioning) {
566 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
567 eap_fast_derive_key_provisioning(sm, data);
568 } else
569 eap_fast_derive_key_auth(sm, data);
570
571 eap_fast_state(data, PHASE2_START);
572
573 return 0;
574 }
575
576
eap_fast_build_phase2_req(struct eap_sm * sm,struct eap_fast_data * data,u8 id)577 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
578 struct eap_fast_data *data,
579 u8 id)
580 {
581 struct wpabuf *req;
582
583 if (data->phase2_priv == NULL) {
584 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
585 "initialized");
586 return NULL;
587 }
588 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
589 if (req == NULL)
590 return NULL;
591
592 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
593 return eap_fast_tlv_eap_payload(req);
594 }
595
596
eap_fast_build_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data)597 static struct wpabuf * eap_fast_build_crypto_binding(
598 struct eap_sm *sm, struct eap_fast_data *data)
599 {
600 struct wpabuf *buf;
601 struct eap_tlv_result_tlv *result;
602 struct eap_tlv_crypto_binding_tlv *binding;
603
604 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
605 if (buf == NULL)
606 return NULL;
607
608 if (data->send_new_pac || data->anon_provisioning ||
609 data->phase2_method)
610 data->final_result = 0;
611 else
612 data->final_result = 1;
613
614 if (!data->final_result || data->eap_seq > 1) {
615 /* Intermediate-Result */
616 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
617 "(status=SUCCESS)");
618 result = wpabuf_put(buf, sizeof(*result));
619 result->tlv_type = host_to_be16(
620 EAP_TLV_TYPE_MANDATORY |
621 EAP_TLV_INTERMEDIATE_RESULT_TLV);
622 result->length = host_to_be16(2);
623 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
624 }
625
626 if (data->final_result) {
627 /* Result TLV */
628 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
629 "(status=SUCCESS)");
630 result = wpabuf_put(buf, sizeof(*result));
631 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
632 EAP_TLV_RESULT_TLV);
633 result->length = host_to_be16(2);
634 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
635 }
636
637 /* Crypto-Binding TLV */
638 binding = wpabuf_put(buf, sizeof(*binding));
639 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
640 EAP_TLV_CRYPTO_BINDING_TLV);
641 binding->length = host_to_be16(sizeof(*binding) -
642 sizeof(struct eap_tlv_hdr));
643 binding->version = EAP_FAST_VERSION;
644 binding->received_version = data->peer_version;
645 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
646 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
647 wpabuf_free(buf);
648 return NULL;
649 }
650
651 /*
652 * RFC 4851, Section 4.2.8:
653 * The nonce in a request MUST have its least significant bit set to 0.
654 */
655 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
656
657 os_memcpy(data->crypto_binding_nonce, binding->nonce,
658 sizeof(binding->nonce));
659
660 /*
661 * RFC 4851, Section 5.3:
662 * CMK = CMK[j]
663 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
664 */
665
666 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
667 (u8 *) binding, sizeof(*binding),
668 binding->compound_mac);
669
670 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
671 "Received Version %d SubType %d",
672 binding->version, binding->received_version,
673 binding->subtype);
674 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
675 binding->nonce, sizeof(binding->nonce));
676 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
677 binding->compound_mac, sizeof(binding->compound_mac));
678
679 return buf;
680 }
681
682
eap_fast_build_pac(struct eap_sm * sm,struct eap_fast_data * data)683 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
684 struct eap_fast_data *data)
685 {
686 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
687 u8 *pac_buf, *pac_opaque;
688 struct wpabuf *buf;
689 u8 *pos;
690 size_t buf_len, srv_id_info_len, pac_len;
691 struct eap_tlv_hdr *pac_tlv;
692 struct pac_tlv_hdr *pac_info;
693 struct eap_tlv_result_tlv *result;
694 struct os_time now;
695
696 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
697 os_get_time(&now) < 0)
698 return NULL;
699 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
700 pac_key, EAP_FAST_PAC_KEY_LEN);
701
702 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
703 (2 + sm->identity_len) + 8;
704 pac_buf = os_malloc(pac_len);
705 if (pac_buf == NULL)
706 return NULL;
707
708 srv_id_info_len = os_strlen(data->srv_id_info);
709
710 pos = pac_buf;
711 *pos++ = PAC_OPAQUE_TYPE_KEY;
712 *pos++ = EAP_FAST_PAC_KEY_LEN;
713 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
714 pos += EAP_FAST_PAC_KEY_LEN;
715
716 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
717 *pos++ = 4;
718 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
719 pos += 4;
720
721 if (sm->identity) {
722 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
723 *pos++ = sm->identity_len;
724 os_memcpy(pos, sm->identity, sm->identity_len);
725 pos += sm->identity_len;
726 }
727
728 pac_len = pos - pac_buf;
729 while (pac_len % 8) {
730 *pos++ = PAC_OPAQUE_TYPE_PAD;
731 pac_len++;
732 }
733
734 pac_opaque = os_malloc(pac_len + 8);
735 if (pac_opaque == NULL) {
736 os_free(pac_buf);
737 return NULL;
738 }
739 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
740 pac_len / 8, pac_buf, pac_opaque) < 0) {
741 os_free(pac_buf);
742 os_free(pac_opaque);
743 return NULL;
744 }
745 os_free(pac_buf);
746
747 pac_len += 8;
748 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
749 pac_opaque, pac_len);
750
751 buf_len = sizeof(*pac_tlv) +
752 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
753 sizeof(struct pac_tlv_hdr) + pac_len +
754 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
755 buf = wpabuf_alloc(buf_len);
756 if (buf == NULL) {
757 os_free(pac_opaque);
758 return NULL;
759 }
760
761 /* Result TLV */
762 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
763 result = wpabuf_put(buf, sizeof(*result));
764 WPA_PUT_BE16((u8 *) &result->tlv_type,
765 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
766 WPA_PUT_BE16((u8 *) &result->length, 2);
767 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
768
769 /* PAC TLV */
770 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
771 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
772 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
773 EAP_TLV_PAC_TLV);
774
775 /* PAC-Key */
776 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
777
778 /* PAC-Opaque */
779 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
780 os_free(pac_opaque);
781
782 /* PAC-Info */
783 pac_info = wpabuf_put(buf, sizeof(*pac_info));
784 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
785
786 /* PAC-Lifetime (inside PAC-Info) */
787 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
788 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
789
790 /* A-ID (inside PAC-Info) */
791 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
792
793 /* Note: headers may be misaligned after A-ID */
794
795 if (sm->identity) {
796 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
797 sm->identity_len);
798 }
799
800 /* A-ID-Info (inside PAC-Info) */
801 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
802 srv_id_info_len);
803
804 /* PAC-Type (inside PAC-Info) */
805 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
806 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
807
808 /* Update PAC-Info and PAC TLV Length fields */
809 pos = wpabuf_put(buf, 0);
810 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
811 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
812
813 return buf;
814 }
815
816
eap_fast_encrypt_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * plain,int piggyback)817 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
818 struct eap_fast_data *data,
819 struct wpabuf *plain, int piggyback)
820 {
821 struct wpabuf *encr;
822
823 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
824 plain);
825 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
826 wpabuf_free(plain);
827
828 if (!encr)
829 return -1;
830
831 if (data->ssl.tls_out && piggyback) {
832 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
833 "(len=%d) with last Phase 1 Message (len=%d "
834 "used=%d)",
835 (int) wpabuf_len(encr),
836 (int) wpabuf_len(data->ssl.tls_out),
837 (int) data->ssl.tls_out_pos);
838 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
839 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
840 "output buffer");
841 wpabuf_free(encr);
842 return -1;
843 }
844 wpabuf_put_buf(data->ssl.tls_out, encr);
845 wpabuf_free(encr);
846 } else {
847 wpabuf_free(data->ssl.tls_out);
848 data->ssl.tls_out_pos = 0;
849 data->ssl.tls_out = encr;
850 }
851
852 return 0;
853 }
854
855
eap_fast_buildReq(struct eap_sm * sm,void * priv,u8 id)856 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
857 {
858 struct eap_fast_data *data = priv;
859 struct wpabuf *req = NULL;
860 int piggyback = 0;
861
862 if (data->ssl.state == FRAG_ACK) {
863 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
864 data->fast_version);
865 }
866
867 if (data->ssl.state == WAIT_FRAG_ACK) {
868 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
869 data->fast_version, id);
870 }
871
872 switch (data->state) {
873 case START:
874 return eap_fast_build_start(sm, data, id);
875 case PHASE1:
876 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
877 if (eap_fast_phase1_done(sm, data) < 0)
878 return NULL;
879 if (data->state == PHASE2_START) {
880 /*
881 * Try to generate Phase 2 data to piggyback
882 * with the end of Phase 1 to avoid extra
883 * roundtrip.
884 */
885 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
886 "Phase 2");
887 if (eap_fast_process_phase2_start(sm, data))
888 break;
889 req = eap_fast_build_phase2_req(sm, data, id);
890 piggyback = 1;
891 }
892 }
893 break;
894 case PHASE2_ID:
895 case PHASE2_METHOD:
896 req = eap_fast_build_phase2_req(sm, data, id);
897 break;
898 case CRYPTO_BINDING:
899 req = eap_fast_build_crypto_binding(sm, data);
900 if (data->phase2_method) {
901 /*
902 * Include the start of the next EAP method in the
903 * sequence in the same message with Crypto-Binding to
904 * save a round-trip.
905 */
906 struct wpabuf *eap;
907 eap = eap_fast_build_phase2_req(sm, data, id);
908 req = wpabuf_concat(req, eap);
909 eap_fast_state(data, PHASE2_METHOD);
910 }
911 break;
912 case REQUEST_PAC:
913 req = eap_fast_build_pac(sm, data);
914 break;
915 default:
916 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
917 __func__, data->state);
918 return NULL;
919 }
920
921 if (req &&
922 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
923 return NULL;
924
925 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
926 data->fast_version, id);
927 }
928
929
eap_fast_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)930 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
931 struct wpabuf *respData)
932 {
933 const u8 *pos;
934 size_t len;
935
936 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
937 if (pos == NULL || len < 1) {
938 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
939 return TRUE;
940 }
941
942 return FALSE;
943 }
944
945
eap_fast_phase2_init(struct eap_sm * sm,struct eap_fast_data * data,EapType eap_type)946 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
947 EapType eap_type)
948 {
949 if (data->phase2_priv && data->phase2_method) {
950 data->phase2_method->reset(sm, data->phase2_priv);
951 data->phase2_method = NULL;
952 data->phase2_priv = NULL;
953 }
954 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
955 eap_type);
956 if (!data->phase2_method)
957 return -1;
958
959 if (data->key_block_p) {
960 sm->auth_challenge = data->key_block_p->server_challenge;
961 sm->peer_challenge = data->key_block_p->client_challenge;
962 }
963 sm->init_phase2 = 1;
964 data->phase2_priv = data->phase2_method->init(sm);
965 sm->init_phase2 = 0;
966 sm->auth_challenge = NULL;
967 sm->peer_challenge = NULL;
968
969 return data->phase2_priv == NULL ? -1 : 0;
970 }
971
972
eap_fast_process_phase2_response(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)973 static void eap_fast_process_phase2_response(struct eap_sm *sm,
974 struct eap_fast_data *data,
975 u8 *in_data, size_t in_len)
976 {
977 u8 next_type = EAP_TYPE_NONE;
978 struct eap_hdr *hdr;
979 u8 *pos;
980 size_t left;
981 struct wpabuf buf;
982 const struct eap_method *m = data->phase2_method;
983 void *priv = data->phase2_priv;
984
985 if (priv == NULL) {
986 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
987 "initialized?!", __func__);
988 return;
989 }
990
991 hdr = (struct eap_hdr *) in_data;
992 pos = (u8 *) (hdr + 1);
993
994 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
995 left = in_len - sizeof(*hdr);
996 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
997 "allowed types", pos + 1, left - 1);
998 #ifdef EAP_SERVER_TNC
999 if (m && m->vendor == EAP_VENDOR_IETF &&
1000 m->method == EAP_TYPE_TNC) {
1001 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
1002 "TNC negotiation");
1003 next_type = eap_fast_req_failure(sm, data);
1004 eap_fast_phase2_init(sm, data, next_type);
1005 return;
1006 }
1007 #endif /* EAP_SERVER_TNC */
1008 eap_sm_process_nak(sm, pos + 1, left - 1);
1009 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1010 sm->user->methods[sm->user_eap_method_index].method !=
1011 EAP_TYPE_NONE) {
1012 next_type = sm->user->methods[
1013 sm->user_eap_method_index++].method;
1014 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1015 next_type);
1016 } else {
1017 next_type = eap_fast_req_failure(sm, data);
1018 }
1019 eap_fast_phase2_init(sm, data, next_type);
1020 return;
1021 }
1022
1023 wpabuf_set(&buf, in_data, in_len);
1024
1025 if (m->check(sm, priv, &buf)) {
1026 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1027 "ignore the packet");
1028 eap_fast_req_failure(sm, data);
1029 return;
1030 }
1031
1032 m->process(sm, priv, &buf);
1033
1034 if (!m->isDone(sm, priv))
1035 return;
1036
1037 if (!m->isSuccess(sm, priv)) {
1038 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1039 next_type = eap_fast_req_failure(sm, data);
1040 eap_fast_phase2_init(sm, data, next_type);
1041 return;
1042 }
1043
1044 switch (data->state) {
1045 case PHASE2_ID:
1046 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1047 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1048 "Identity not found in the user "
1049 "database",
1050 sm->identity, sm->identity_len);
1051 next_type = eap_fast_req_failure(sm, data);
1052 break;
1053 }
1054
1055 eap_fast_state(data, PHASE2_METHOD);
1056 if (data->anon_provisioning) {
1057 /*
1058 * Only EAP-MSCHAPv2 is allowed for anonymous
1059 * provisioning.
1060 */
1061 next_type = EAP_TYPE_MSCHAPV2;
1062 sm->user_eap_method_index = 0;
1063 } else {
1064 next_type = sm->user->methods[0].method;
1065 sm->user_eap_method_index = 1;
1066 }
1067 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1068 break;
1069 case PHASE2_METHOD:
1070 case CRYPTO_BINDING:
1071 eap_fast_update_icmk(sm, data);
1072 eap_fast_state(data, CRYPTO_BINDING);
1073 data->eap_seq++;
1074 next_type = EAP_TYPE_NONE;
1075 #ifdef EAP_SERVER_TNC
1076 if (sm->tnc && !data->tnc_started) {
1077 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1078 next_type = EAP_TYPE_TNC;
1079 data->tnc_started = 1;
1080 }
1081 #endif /* EAP_SERVER_TNC */
1082 break;
1083 case FAILURE:
1084 break;
1085 default:
1086 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1087 __func__, data->state);
1088 break;
1089 }
1090
1091 eap_fast_phase2_init(sm, data, next_type);
1092 }
1093
1094
eap_fast_process_phase2_eap(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)1095 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1096 struct eap_fast_data *data,
1097 u8 *in_data, size_t in_len)
1098 {
1099 struct eap_hdr *hdr;
1100 size_t len;
1101
1102 hdr = (struct eap_hdr *) in_data;
1103 if (in_len < (int) sizeof(*hdr)) {
1104 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1105 "EAP frame (len=%lu)", (unsigned long) in_len);
1106 eap_fast_req_failure(sm, data);
1107 return;
1108 }
1109 len = be_to_host16(hdr->length);
1110 if (len > in_len) {
1111 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1112 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1113 (unsigned long) in_len, (unsigned long) len);
1114 eap_fast_req_failure(sm, data);
1115 return;
1116 }
1117 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1118 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1119 (unsigned long) len);
1120 switch (hdr->code) {
1121 case EAP_CODE_RESPONSE:
1122 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1123 break;
1124 default:
1125 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1126 "Phase 2 EAP header", hdr->code);
1127 break;
1128 }
1129 }
1130
1131
eap_fast_parse_tlvs(struct wpabuf * data,struct eap_fast_tlv_parse * tlv)1132 static int eap_fast_parse_tlvs(struct wpabuf *data,
1133 struct eap_fast_tlv_parse *tlv)
1134 {
1135 int mandatory, tlv_type, res;
1136 size_t len;
1137 u8 *pos, *end;
1138
1139 os_memset(tlv, 0, sizeof(*tlv));
1140
1141 pos = wpabuf_mhead(data);
1142 end = pos + wpabuf_len(data);
1143 while (end - pos > 4) {
1144 mandatory = pos[0] & 0x80;
1145 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1146 pos += 2;
1147 len = WPA_GET_BE16(pos);
1148 pos += 2;
1149 if (len > (size_t) (end - pos)) {
1150 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1151 return -1;
1152 }
1153 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1154 "TLV type %d length %u%s",
1155 tlv_type, (unsigned int) len,
1156 mandatory ? " (mandatory)" : "");
1157
1158 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1159 if (res == -2)
1160 break;
1161 if (res < 0) {
1162 if (mandatory) {
1163 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1164 "mandatory TLV type %d", tlv_type);
1165 /* TODO: generate Nak TLV */
1166 break;
1167 } else {
1168 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1169 "unknown optional TLV type %d",
1170 tlv_type);
1171 }
1172 }
1173
1174 pos += len;
1175 }
1176
1177 return 0;
1178 }
1179
1180
eap_fast_validate_crypto_binding(struct eap_fast_data * data,struct eap_tlv_crypto_binding_tlv * b,size_t bind_len)1181 static int eap_fast_validate_crypto_binding(
1182 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1183 size_t bind_len)
1184 {
1185 u8 cmac[SHA1_MAC_LEN];
1186
1187 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1188 "Version %d Received Version %d SubType %d",
1189 b->version, b->received_version, b->subtype);
1190 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1191 b->nonce, sizeof(b->nonce));
1192 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1193 b->compound_mac, sizeof(b->compound_mac));
1194
1195 if (b->version != EAP_FAST_VERSION ||
1196 b->received_version != EAP_FAST_VERSION) {
1197 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1198 "in Crypto-Binding: version %d "
1199 "received_version %d", b->version,
1200 b->received_version);
1201 return -1;
1202 }
1203
1204 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1205 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1206 "Crypto-Binding: %d", b->subtype);
1207 return -1;
1208 }
1209
1210 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1211 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1212 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1213 "Crypto-Binding");
1214 return -1;
1215 }
1216
1217 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1218 os_memset(b->compound_mac, 0, sizeof(cmac));
1219 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1220 "Compound MAC calculation",
1221 (u8 *) b, bind_len);
1222 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1223 b->compound_mac);
1224 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1225 wpa_hexdump(MSG_MSGDUMP,
1226 "EAP-FAST: Calculated Compound MAC",
1227 b->compound_mac, sizeof(cmac));
1228 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1229 "match");
1230 return -1;
1231 }
1232
1233 return 0;
1234 }
1235
1236
eap_fast_pac_type(u8 * pac,size_t len,u16 type)1237 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1238 {
1239 struct eap_tlv_pac_type_tlv *tlv;
1240
1241 if (pac == NULL || len != sizeof(*tlv))
1242 return 0;
1243
1244 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1245
1246 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1247 be_to_host16(tlv->length) == 2 &&
1248 be_to_host16(tlv->pac_type) == type;
1249 }
1250
1251
eap_fast_process_phase2_tlvs(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_data)1252 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1253 struct eap_fast_data *data,
1254 struct wpabuf *in_data)
1255 {
1256 struct eap_fast_tlv_parse tlv;
1257 int check_crypto_binding = data->state == CRYPTO_BINDING;
1258
1259 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1260 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1261 "Phase 2 TLVs");
1262 return;
1263 }
1264
1265 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1266 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1267 "failure");
1268 eap_fast_state(data, FAILURE);
1269 return;
1270 }
1271
1272 if (data->state == REQUEST_PAC) {
1273 u16 type, len, res;
1274 if (tlv.pac == NULL || tlv.pac_len < 6) {
1275 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1276 "Acknowledgement received");
1277 eap_fast_state(data, FAILURE);
1278 return;
1279 }
1280
1281 type = WPA_GET_BE16(tlv.pac);
1282 len = WPA_GET_BE16(tlv.pac + 2);
1283 res = WPA_GET_BE16(tlv.pac + 4);
1284
1285 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1286 res != EAP_TLV_RESULT_SUCCESS) {
1287 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1288 "contain acknowledgement");
1289 eap_fast_state(data, FAILURE);
1290 return;
1291 }
1292
1293 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1294 "- PAC provisioning succeeded");
1295 eap_fast_state(data, (data->anon_provisioning ||
1296 data->send_new_pac == 2) ?
1297 FAILURE : SUCCESS);
1298 return;
1299 }
1300
1301 if (check_crypto_binding) {
1302 if (tlv.crypto_binding == NULL) {
1303 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1304 "TLV received");
1305 eap_fast_state(data, FAILURE);
1306 return;
1307 }
1308
1309 if (data->final_result &&
1310 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1311 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1312 "without Success Result");
1313 eap_fast_state(data, FAILURE);
1314 return;
1315 }
1316
1317 if (!data->final_result &&
1318 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1319 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1320 "without intermediate Success Result");
1321 eap_fast_state(data, FAILURE);
1322 return;
1323 }
1324
1325 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1326 tlv.crypto_binding_len)) {
1327 eap_fast_state(data, FAILURE);
1328 return;
1329 }
1330
1331 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1332 "received");
1333 if (data->final_result) {
1334 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1335 "completed successfully");
1336 }
1337
1338 if (data->anon_provisioning &&
1339 sm->eap_fast_prov != ANON_PROV &&
1340 sm->eap_fast_prov != BOTH_PROV) {
1341 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1342 "use unauthenticated provisioning which is "
1343 "disabled");
1344 eap_fast_state(data, FAILURE);
1345 return;
1346 }
1347
1348 if (sm->eap_fast_prov != AUTH_PROV &&
1349 sm->eap_fast_prov != BOTH_PROV &&
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: Client is trying to "
1354 "use authenticated provisioning which is "
1355 "disabled");
1356 eap_fast_state(data, FAILURE);
1357 return;
1358 }
1359
1360 if (data->anon_provisioning ||
1361 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1362 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1363 PAC_TYPE_TUNNEL_PAC))) {
1364 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1365 "Tunnel PAC");
1366 eap_fast_state(data, REQUEST_PAC);
1367 } else if (data->send_new_pac) {
1368 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1369 "re-keying of Tunnel PAC");
1370 eap_fast_state(data, REQUEST_PAC);
1371 } else if (data->final_result)
1372 eap_fast_state(data, SUCCESS);
1373 }
1374
1375 if (tlv.eap_payload_tlv) {
1376 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1377 tlv.eap_payload_tlv_len);
1378 }
1379 }
1380
1381
eap_fast_process_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_buf)1382 static void eap_fast_process_phase2(struct eap_sm *sm,
1383 struct eap_fast_data *data,
1384 struct wpabuf *in_buf)
1385 {
1386 struct wpabuf *in_decrypted;
1387
1388 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1389 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1390
1391 if (data->pending_phase2_resp) {
1392 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1393 "skip decryption and use old data");
1394 eap_fast_process_phase2_tlvs(sm, data,
1395 data->pending_phase2_resp);
1396 wpabuf_free(data->pending_phase2_resp);
1397 data->pending_phase2_resp = NULL;
1398 return;
1399 }
1400
1401 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1402 in_buf);
1403 if (in_decrypted == NULL) {
1404 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1405 "data");
1406 eap_fast_state(data, FAILURE);
1407 return;
1408 }
1409
1410 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1411 in_decrypted);
1412
1413 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1414
1415 if (sm->method_pending == METHOD_PENDING_WAIT) {
1416 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1417 "pending wait state - save decrypted response");
1418 wpabuf_free(data->pending_phase2_resp);
1419 data->pending_phase2_resp = in_decrypted;
1420 return;
1421 }
1422
1423 wpabuf_free(in_decrypted);
1424 }
1425
1426
eap_fast_process_version(struct eap_sm * sm,void * priv,int peer_version)1427 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1428 int peer_version)
1429 {
1430 struct eap_fast_data *data = priv;
1431
1432 data->peer_version = peer_version;
1433
1434 if (data->force_version >= 0 && peer_version != data->force_version) {
1435 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1436 " version (forced=%d peer=%d) - reject",
1437 data->force_version, peer_version);
1438 return -1;
1439 }
1440
1441 if (peer_version < data->fast_version) {
1442 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1443 "use version %d",
1444 peer_version, data->fast_version, peer_version);
1445 data->fast_version = peer_version;
1446 }
1447
1448 return 0;
1449 }
1450
1451
eap_fast_process_phase1(struct eap_sm * sm,struct eap_fast_data * data)1452 static int eap_fast_process_phase1(struct eap_sm *sm,
1453 struct eap_fast_data *data)
1454 {
1455 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1456 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1457 eap_fast_state(data, FAILURE);
1458 return -1;
1459 }
1460
1461 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1462 wpabuf_len(data->ssl.tls_out) > 0)
1463 return 1;
1464
1465 /*
1466 * Phase 1 was completed with the received message (e.g., when using
1467 * abbreviated handshake), so Phase 2 can be started immediately
1468 * without having to send through an empty message to the peer.
1469 */
1470
1471 return eap_fast_phase1_done(sm, data);
1472 }
1473
1474
eap_fast_process_phase2_start(struct eap_sm * sm,struct eap_fast_data * data)1475 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1476 struct eap_fast_data *data)
1477 {
1478 u8 next_type;
1479
1480 if (data->identity) {
1481 os_free(sm->identity);
1482 sm->identity = data->identity;
1483 data->identity = NULL;
1484 sm->identity_len = data->identity_len;
1485 data->identity_len = 0;
1486 sm->require_identity_match = 1;
1487 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1488 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1489 "Phase2 Identity not found "
1490 "in the user database",
1491 sm->identity, sm->identity_len);
1492 next_type = eap_fast_req_failure(sm, data);
1493 } else {
1494 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1495 "known - skip Phase 2 Identity Request");
1496 next_type = sm->user->methods[0].method;
1497 sm->user_eap_method_index = 1;
1498 }
1499
1500 eap_fast_state(data, PHASE2_METHOD);
1501 } else {
1502 eap_fast_state(data, PHASE2_ID);
1503 next_type = EAP_TYPE_IDENTITY;
1504 }
1505
1506 return eap_fast_phase2_init(sm, data, next_type);
1507 }
1508
1509
eap_fast_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1510 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1511 const struct wpabuf *respData)
1512 {
1513 struct eap_fast_data *data = priv;
1514
1515 switch (data->state) {
1516 case PHASE1:
1517 if (eap_fast_process_phase1(sm, data))
1518 break;
1519
1520 /* fall through to PHASE2_START */
1521 case PHASE2_START:
1522 eap_fast_process_phase2_start(sm, data);
1523 break;
1524 case PHASE2_ID:
1525 case PHASE2_METHOD:
1526 case CRYPTO_BINDING:
1527 case REQUEST_PAC:
1528 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1529 break;
1530 default:
1531 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1532 data->state, __func__);
1533 break;
1534 }
1535 }
1536
1537
eap_fast_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1538 static void eap_fast_process(struct eap_sm *sm, void *priv,
1539 struct wpabuf *respData)
1540 {
1541 struct eap_fast_data *data = priv;
1542 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1543 EAP_TYPE_FAST, eap_fast_process_version,
1544 eap_fast_process_msg) < 0)
1545 eap_fast_state(data, FAILURE);
1546 }
1547
1548
eap_fast_isDone(struct eap_sm * sm,void * priv)1549 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1550 {
1551 struct eap_fast_data *data = priv;
1552 return data->state == SUCCESS || data->state == FAILURE;
1553 }
1554
1555
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1556 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1557 {
1558 struct eap_fast_data *data = priv;
1559 u8 *eapKeyData;
1560
1561 if (data->state != SUCCESS)
1562 return NULL;
1563
1564 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1565 if (eapKeyData == NULL)
1566 return NULL;
1567
1568 if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) {
1569 os_free(eapKeyData);
1570 return NULL;
1571 }
1572 *len = EAP_FAST_KEY_LEN;
1573
1574 return eapKeyData;
1575 }
1576
1577
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1578 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1579 {
1580 struct eap_fast_data *data = priv;
1581 u8 *eapKeyData;
1582
1583 if (data->state != SUCCESS)
1584 return NULL;
1585
1586 eapKeyData = os_malloc(EAP_EMSK_LEN);
1587 if (eapKeyData == NULL)
1588 return NULL;
1589
1590 if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) {
1591 os_free(eapKeyData);
1592 return NULL;
1593 }
1594 *len = EAP_EMSK_LEN;
1595
1596 return eapKeyData;
1597 }
1598
1599
eap_fast_isSuccess(struct eap_sm * sm,void * priv)1600 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1601 {
1602 struct eap_fast_data *data = priv;
1603 return data->state == SUCCESS;
1604 }
1605
1606
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1607 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1608 {
1609 struct eap_fast_data *data = priv;
1610
1611 if (data->state != SUCCESS)
1612 return NULL;
1613
1614 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1615 len);
1616 }
1617
1618
eap_server_fast_register(void)1619 int eap_server_fast_register(void)
1620 {
1621 struct eap_method *eap;
1622
1623 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1624 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1625 if (eap == NULL)
1626 return -1;
1627
1628 eap->init = eap_fast_init;
1629 eap->reset = eap_fast_reset;
1630 eap->buildReq = eap_fast_buildReq;
1631 eap->check = eap_fast_check;
1632 eap->process = eap_fast_process;
1633 eap->isDone = eap_fast_isDone;
1634 eap->getKey = eap_fast_getKey;
1635 eap->get_emsk = eap_fast_get_emsk;
1636 eap->isSuccess = eap_fast_isSuccess;
1637 eap->getSessionId = eap_fast_get_session_id;
1638
1639 return eap_server_method_register(eap);
1640 }
1641