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_memdup(sm->eap_fast_a_id, sm->eap_fast_a_id_len);
475 if (data->srv_id == NULL) {
476 eap_fast_reset(sm, data);
477 return NULL;
478 }
479 data->srv_id_len = sm->eap_fast_a_id_len;
480
481 if (sm->eap_fast_a_id_info == NULL) {
482 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
483 eap_fast_reset(sm, data);
484 return NULL;
485 }
486 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
487 if (data->srv_id_info == NULL) {
488 eap_fast_reset(sm, data);
489 return NULL;
490 }
491
492 /* PAC-Key lifetime in seconds (hard limit) */
493 data->pac_key_lifetime = sm->pac_key_lifetime;
494
495 /*
496 * PAC-Key refresh time in seconds (soft limit on remaining hard
497 * limit). The server will generate a new PAC-Key when this number of
498 * seconds (or fewer) of the lifetime remains.
499 */
500 data->pac_key_refresh_time = sm->pac_key_refresh_time;
501
502 return data;
503 }
504
505
eap_fast_reset(struct eap_sm * sm,void * priv)506 static void eap_fast_reset(struct eap_sm *sm, void *priv)
507 {
508 struct eap_fast_data *data = priv;
509 if (data == NULL)
510 return;
511 if (data->phase2_priv && data->phase2_method)
512 data->phase2_method->reset(sm, data->phase2_priv);
513 eap_server_tls_ssl_deinit(sm, &data->ssl);
514 os_free(data->srv_id);
515 os_free(data->srv_id_info);
516 os_free(data->key_block_p);
517 wpabuf_free(data->pending_phase2_resp);
518 os_free(data->identity);
519 bin_clear_free(data, sizeof(*data));
520 }
521
522
eap_fast_build_start(struct eap_sm * sm,struct eap_fast_data * data,u8 id)523 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
524 struct eap_fast_data *data, u8 id)
525 {
526 struct wpabuf *req;
527
528 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
529 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
530 EAP_CODE_REQUEST, id);
531 if (req == NULL) {
532 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
533 " request");
534 eap_fast_state(data, FAILURE);
535 return NULL;
536 }
537
538 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
539
540 /* RFC 4851, 4.1.1. Authority ID Data */
541 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
542
543 eap_fast_state(data, PHASE1);
544
545 return req;
546 }
547
548
eap_fast_phase1_done(struct eap_sm * sm,struct eap_fast_data * data)549 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
550 {
551 char cipher[64];
552
553 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
554
555 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
556 < 0) {
557 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
558 "information");
559 eap_fast_state(data, FAILURE);
560 return -1;
561 }
562 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
563
564 if (data->anon_provisioning) {
565 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
566 eap_fast_derive_key_provisioning(sm, data);
567 } else
568 eap_fast_derive_key_auth(sm, data);
569
570 eap_fast_state(data, PHASE2_START);
571
572 return 0;
573 }
574
575
eap_fast_build_phase2_req(struct eap_sm * sm,struct eap_fast_data * data,u8 id)576 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
577 struct eap_fast_data *data,
578 u8 id)
579 {
580 struct wpabuf *req;
581
582 if (data->phase2_priv == NULL) {
583 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
584 "initialized");
585 return NULL;
586 }
587 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
588 if (req == NULL)
589 return NULL;
590
591 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
592 return eap_fast_tlv_eap_payload(req);
593 }
594
595
eap_fast_build_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data)596 static struct wpabuf * eap_fast_build_crypto_binding(
597 struct eap_sm *sm, struct eap_fast_data *data)
598 {
599 struct wpabuf *buf;
600 struct eap_tlv_result_tlv *result;
601 struct eap_tlv_crypto_binding_tlv *binding;
602
603 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
604 if (buf == NULL)
605 return NULL;
606
607 if (data->send_new_pac || data->anon_provisioning ||
608 data->phase2_method)
609 data->final_result = 0;
610 else
611 data->final_result = 1;
612
613 if (!data->final_result || data->eap_seq > 1) {
614 /* Intermediate-Result */
615 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
616 "(status=SUCCESS)");
617 result = wpabuf_put(buf, sizeof(*result));
618 result->tlv_type = host_to_be16(
619 EAP_TLV_TYPE_MANDATORY |
620 EAP_TLV_INTERMEDIATE_RESULT_TLV);
621 result->length = host_to_be16(2);
622 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
623 }
624
625 if (data->final_result) {
626 /* Result TLV */
627 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
628 "(status=SUCCESS)");
629 result = wpabuf_put(buf, sizeof(*result));
630 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
631 EAP_TLV_RESULT_TLV);
632 result->length = host_to_be16(2);
633 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
634 }
635
636 /* Crypto-Binding TLV */
637 binding = wpabuf_put(buf, sizeof(*binding));
638 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
639 EAP_TLV_CRYPTO_BINDING_TLV);
640 binding->length = host_to_be16(sizeof(*binding) -
641 sizeof(struct eap_tlv_hdr));
642 binding->version = EAP_FAST_VERSION;
643 binding->received_version = data->peer_version;
644 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
645 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
646 wpabuf_free(buf);
647 return NULL;
648 }
649
650 /*
651 * RFC 4851, Section 4.2.8:
652 * The nonce in a request MUST have its least significant bit set to 0.
653 */
654 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
655
656 os_memcpy(data->crypto_binding_nonce, binding->nonce,
657 sizeof(binding->nonce));
658
659 /*
660 * RFC 4851, Section 5.3:
661 * CMK = CMK[j]
662 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
663 */
664
665 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
666 (u8 *) binding, sizeof(*binding),
667 binding->compound_mac);
668
669 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
670 "Received Version %d SubType %d",
671 binding->version, binding->received_version,
672 binding->subtype);
673 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
674 binding->nonce, sizeof(binding->nonce));
675 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
676 binding->compound_mac, sizeof(binding->compound_mac));
677
678 return buf;
679 }
680
681
eap_fast_build_pac(struct eap_sm * sm,struct eap_fast_data * data)682 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
683 struct eap_fast_data *data)
684 {
685 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
686 u8 *pac_buf, *pac_opaque;
687 struct wpabuf *buf;
688 u8 *pos;
689 size_t buf_len, srv_id_info_len, pac_len;
690 struct eap_tlv_hdr *pac_tlv;
691 struct pac_tlv_hdr *pac_info;
692 struct eap_tlv_result_tlv *result;
693 struct os_time now;
694
695 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
696 os_get_time(&now) < 0)
697 return NULL;
698 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
699 pac_key, EAP_FAST_PAC_KEY_LEN);
700
701 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
702 (2 + sm->identity_len) + 8;
703 pac_buf = os_malloc(pac_len);
704 if (pac_buf == NULL)
705 return NULL;
706
707 srv_id_info_len = os_strlen(data->srv_id_info);
708
709 pos = pac_buf;
710 *pos++ = PAC_OPAQUE_TYPE_KEY;
711 *pos++ = EAP_FAST_PAC_KEY_LEN;
712 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
713 pos += EAP_FAST_PAC_KEY_LEN;
714
715 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
716 *pos++ = 4;
717 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
718 pos += 4;
719
720 if (sm->identity) {
721 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
722 *pos++ = sm->identity_len;
723 os_memcpy(pos, sm->identity, sm->identity_len);
724 pos += sm->identity_len;
725 }
726
727 pac_len = pos - pac_buf;
728 while (pac_len % 8) {
729 *pos++ = PAC_OPAQUE_TYPE_PAD;
730 pac_len++;
731 }
732
733 pac_opaque = os_malloc(pac_len + 8);
734 if (pac_opaque == NULL) {
735 os_free(pac_buf);
736 return NULL;
737 }
738 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
739 pac_len / 8, pac_buf, pac_opaque) < 0) {
740 os_free(pac_buf);
741 os_free(pac_opaque);
742 return NULL;
743 }
744 os_free(pac_buf);
745
746 pac_len += 8;
747 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
748 pac_opaque, pac_len);
749
750 buf_len = sizeof(*pac_tlv) +
751 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
752 sizeof(struct pac_tlv_hdr) + pac_len +
753 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
754 buf = wpabuf_alloc(buf_len);
755 if (buf == NULL) {
756 os_free(pac_opaque);
757 return NULL;
758 }
759
760 /* Result TLV */
761 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
762 result = wpabuf_put(buf, sizeof(*result));
763 WPA_PUT_BE16((u8 *) &result->tlv_type,
764 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
765 WPA_PUT_BE16((u8 *) &result->length, 2);
766 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
767
768 /* PAC TLV */
769 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
770 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
771 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
772 EAP_TLV_PAC_TLV);
773
774 /* PAC-Key */
775 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
776
777 /* PAC-Opaque */
778 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
779 os_free(pac_opaque);
780
781 /* PAC-Info */
782 pac_info = wpabuf_put(buf, sizeof(*pac_info));
783 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
784
785 /* PAC-Lifetime (inside PAC-Info) */
786 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
787 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
788
789 /* A-ID (inside PAC-Info) */
790 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
791
792 /* Note: headers may be misaligned after A-ID */
793
794 if (sm->identity) {
795 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
796 sm->identity_len);
797 }
798
799 /* A-ID-Info (inside PAC-Info) */
800 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
801 srv_id_info_len);
802
803 /* PAC-Type (inside PAC-Info) */
804 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
805 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
806
807 /* Update PAC-Info and PAC TLV Length fields */
808 pos = wpabuf_put(buf, 0);
809 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
810 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
811
812 return buf;
813 }
814
815
eap_fast_encrypt_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * plain,int piggyback)816 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
817 struct eap_fast_data *data,
818 struct wpabuf *plain, int piggyback)
819 {
820 struct wpabuf *encr;
821
822 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
823 plain);
824 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
825 wpabuf_free(plain);
826
827 if (!encr)
828 return -1;
829
830 if (data->ssl.tls_out && piggyback) {
831 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
832 "(len=%d) with last Phase 1 Message (len=%d "
833 "used=%d)",
834 (int) wpabuf_len(encr),
835 (int) wpabuf_len(data->ssl.tls_out),
836 (int) data->ssl.tls_out_pos);
837 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
838 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
839 "output buffer");
840 wpabuf_free(encr);
841 return -1;
842 }
843 wpabuf_put_buf(data->ssl.tls_out, encr);
844 wpabuf_free(encr);
845 } else {
846 wpabuf_free(data->ssl.tls_out);
847 data->ssl.tls_out_pos = 0;
848 data->ssl.tls_out = encr;
849 }
850
851 return 0;
852 }
853
854
eap_fast_buildReq(struct eap_sm * sm,void * priv,u8 id)855 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
856 {
857 struct eap_fast_data *data = priv;
858 struct wpabuf *req = NULL;
859 int piggyback = 0;
860
861 if (data->ssl.state == FRAG_ACK) {
862 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
863 data->fast_version);
864 }
865
866 if (data->ssl.state == WAIT_FRAG_ACK) {
867 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
868 data->fast_version, id);
869 }
870
871 switch (data->state) {
872 case START:
873 return eap_fast_build_start(sm, data, id);
874 case PHASE1:
875 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
876 if (eap_fast_phase1_done(sm, data) < 0)
877 return NULL;
878 if (data->state == PHASE2_START) {
879 /*
880 * Try to generate Phase 2 data to piggyback
881 * with the end of Phase 1 to avoid extra
882 * roundtrip.
883 */
884 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
885 "Phase 2");
886 if (eap_fast_process_phase2_start(sm, data))
887 break;
888 req = eap_fast_build_phase2_req(sm, data, id);
889 piggyback = 1;
890 }
891 }
892 break;
893 case PHASE2_ID:
894 case PHASE2_METHOD:
895 req = eap_fast_build_phase2_req(sm, data, id);
896 break;
897 case CRYPTO_BINDING:
898 req = eap_fast_build_crypto_binding(sm, data);
899 if (data->phase2_method) {
900 /*
901 * Include the start of the next EAP method in the
902 * sequence in the same message with Crypto-Binding to
903 * save a round-trip.
904 */
905 struct wpabuf *eap;
906 eap = eap_fast_build_phase2_req(sm, data, id);
907 req = wpabuf_concat(req, eap);
908 eap_fast_state(data, PHASE2_METHOD);
909 }
910 break;
911 case REQUEST_PAC:
912 req = eap_fast_build_pac(sm, data);
913 break;
914 default:
915 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
916 __func__, data->state);
917 return NULL;
918 }
919
920 if (req &&
921 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
922 return NULL;
923
924 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
925 data->fast_version, id);
926 }
927
928
eap_fast_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)929 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
930 struct wpabuf *respData)
931 {
932 const u8 *pos;
933 size_t len;
934
935 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
936 if (pos == NULL || len < 1) {
937 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
938 return TRUE;
939 }
940
941 return FALSE;
942 }
943
944
eap_fast_phase2_init(struct eap_sm * sm,struct eap_fast_data * data,EapType eap_type)945 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
946 EapType eap_type)
947 {
948 if (data->phase2_priv && data->phase2_method) {
949 data->phase2_method->reset(sm, data->phase2_priv);
950 data->phase2_method = NULL;
951 data->phase2_priv = NULL;
952 }
953 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
954 eap_type);
955 if (!data->phase2_method)
956 return -1;
957
958 if (data->key_block_p) {
959 sm->auth_challenge = data->key_block_p->server_challenge;
960 sm->peer_challenge = data->key_block_p->client_challenge;
961 }
962 sm->init_phase2 = 1;
963 data->phase2_priv = data->phase2_method->init(sm);
964 sm->init_phase2 = 0;
965 sm->auth_challenge = NULL;
966 sm->peer_challenge = NULL;
967
968 return data->phase2_priv == NULL ? -1 : 0;
969 }
970
971
eap_fast_process_phase2_response(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)972 static void eap_fast_process_phase2_response(struct eap_sm *sm,
973 struct eap_fast_data *data,
974 u8 *in_data, size_t in_len)
975 {
976 u8 next_type = EAP_TYPE_NONE;
977 struct eap_hdr *hdr;
978 u8 *pos;
979 size_t left;
980 struct wpabuf buf;
981 const struct eap_method *m = data->phase2_method;
982 void *priv = data->phase2_priv;
983
984 if (priv == NULL) {
985 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
986 "initialized?!", __func__);
987 return;
988 }
989
990 hdr = (struct eap_hdr *) in_data;
991 pos = (u8 *) (hdr + 1);
992
993 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
994 left = in_len - sizeof(*hdr);
995 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
996 "allowed types", pos + 1, left - 1);
997 #ifdef EAP_SERVER_TNC
998 if (m && m->vendor == EAP_VENDOR_IETF &&
999 m->method == EAP_TYPE_TNC) {
1000 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
1001 "TNC negotiation");
1002 next_type = eap_fast_req_failure(sm, data);
1003 eap_fast_phase2_init(sm, data, next_type);
1004 return;
1005 }
1006 #endif /* EAP_SERVER_TNC */
1007 eap_sm_process_nak(sm, pos + 1, left - 1);
1008 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1009 sm->user->methods[sm->user_eap_method_index].method !=
1010 EAP_TYPE_NONE) {
1011 next_type = sm->user->methods[
1012 sm->user_eap_method_index++].method;
1013 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1014 next_type);
1015 } else {
1016 next_type = eap_fast_req_failure(sm, data);
1017 }
1018 eap_fast_phase2_init(sm, data, next_type);
1019 return;
1020 }
1021
1022 wpabuf_set(&buf, in_data, in_len);
1023
1024 if (m->check(sm, priv, &buf)) {
1025 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1026 "ignore the packet");
1027 eap_fast_req_failure(sm, data);
1028 return;
1029 }
1030
1031 m->process(sm, priv, &buf);
1032
1033 if (!m->isDone(sm, priv))
1034 return;
1035
1036 if (!m->isSuccess(sm, priv)) {
1037 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1038 next_type = eap_fast_req_failure(sm, data);
1039 eap_fast_phase2_init(sm, data, next_type);
1040 return;
1041 }
1042
1043 switch (data->state) {
1044 case PHASE2_ID:
1045 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1046 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1047 "Identity not found in the user "
1048 "database",
1049 sm->identity, sm->identity_len);
1050 next_type = eap_fast_req_failure(sm, data);
1051 break;
1052 }
1053
1054 eap_fast_state(data, PHASE2_METHOD);
1055 if (data->anon_provisioning) {
1056 /*
1057 * Only EAP-MSCHAPv2 is allowed for anonymous
1058 * provisioning.
1059 */
1060 next_type = EAP_TYPE_MSCHAPV2;
1061 sm->user_eap_method_index = 0;
1062 } else {
1063 next_type = sm->user->methods[0].method;
1064 sm->user_eap_method_index = 1;
1065 }
1066 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1067 break;
1068 case PHASE2_METHOD:
1069 case CRYPTO_BINDING:
1070 eap_fast_update_icmk(sm, data);
1071 eap_fast_state(data, CRYPTO_BINDING);
1072 data->eap_seq++;
1073 next_type = EAP_TYPE_NONE;
1074 #ifdef EAP_SERVER_TNC
1075 if (sm->tnc && !data->tnc_started) {
1076 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1077 next_type = EAP_TYPE_TNC;
1078 data->tnc_started = 1;
1079 }
1080 #endif /* EAP_SERVER_TNC */
1081 break;
1082 case FAILURE:
1083 break;
1084 default:
1085 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1086 __func__, data->state);
1087 break;
1088 }
1089
1090 eap_fast_phase2_init(sm, data, next_type);
1091 }
1092
1093
eap_fast_process_phase2_eap(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)1094 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1095 struct eap_fast_data *data,
1096 u8 *in_data, size_t in_len)
1097 {
1098 struct eap_hdr *hdr;
1099 size_t len;
1100
1101 hdr = (struct eap_hdr *) in_data;
1102 if (in_len < (int) sizeof(*hdr)) {
1103 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1104 "EAP frame (len=%lu)", (unsigned long) in_len);
1105 eap_fast_req_failure(sm, data);
1106 return;
1107 }
1108 len = be_to_host16(hdr->length);
1109 if (len > in_len) {
1110 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1111 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1112 (unsigned long) in_len, (unsigned long) len);
1113 eap_fast_req_failure(sm, data);
1114 return;
1115 }
1116 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1117 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1118 (unsigned long) len);
1119 switch (hdr->code) {
1120 case EAP_CODE_RESPONSE:
1121 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1122 break;
1123 default:
1124 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1125 "Phase 2 EAP header", hdr->code);
1126 break;
1127 }
1128 }
1129
1130
eap_fast_parse_tlvs(struct wpabuf * data,struct eap_fast_tlv_parse * tlv)1131 static int eap_fast_parse_tlvs(struct wpabuf *data,
1132 struct eap_fast_tlv_parse *tlv)
1133 {
1134 int mandatory, tlv_type, res;
1135 size_t len;
1136 u8 *pos, *end;
1137
1138 os_memset(tlv, 0, sizeof(*tlv));
1139
1140 pos = wpabuf_mhead(data);
1141 end = pos + wpabuf_len(data);
1142 while (end - pos > 4) {
1143 mandatory = pos[0] & 0x80;
1144 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1145 pos += 2;
1146 len = WPA_GET_BE16(pos);
1147 pos += 2;
1148 if (len > (size_t) (end - pos)) {
1149 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1150 return -1;
1151 }
1152 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1153 "TLV type %d length %u%s",
1154 tlv_type, (unsigned int) len,
1155 mandatory ? " (mandatory)" : "");
1156
1157 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1158 if (res == -2)
1159 break;
1160 if (res < 0) {
1161 if (mandatory) {
1162 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1163 "mandatory TLV type %d", tlv_type);
1164 /* TODO: generate Nak TLV */
1165 break;
1166 } else {
1167 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1168 "unknown optional TLV type %d",
1169 tlv_type);
1170 }
1171 }
1172
1173 pos += len;
1174 }
1175
1176 return 0;
1177 }
1178
1179
eap_fast_validate_crypto_binding(struct eap_fast_data * data,struct eap_tlv_crypto_binding_tlv * b,size_t bind_len)1180 static int eap_fast_validate_crypto_binding(
1181 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1182 size_t bind_len)
1183 {
1184 u8 cmac[SHA1_MAC_LEN];
1185
1186 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1187 "Version %d Received Version %d SubType %d",
1188 b->version, b->received_version, b->subtype);
1189 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1190 b->nonce, sizeof(b->nonce));
1191 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1192 b->compound_mac, sizeof(b->compound_mac));
1193
1194 if (b->version != EAP_FAST_VERSION ||
1195 b->received_version != EAP_FAST_VERSION) {
1196 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1197 "in Crypto-Binding: version %d "
1198 "received_version %d", b->version,
1199 b->received_version);
1200 return -1;
1201 }
1202
1203 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1204 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1205 "Crypto-Binding: %d", b->subtype);
1206 return -1;
1207 }
1208
1209 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1210 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1211 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1212 "Crypto-Binding");
1213 return -1;
1214 }
1215
1216 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1217 os_memset(b->compound_mac, 0, sizeof(cmac));
1218 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1219 "Compound MAC calculation",
1220 (u8 *) b, bind_len);
1221 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1222 b->compound_mac);
1223 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1224 wpa_hexdump(MSG_MSGDUMP,
1225 "EAP-FAST: Calculated Compound MAC",
1226 b->compound_mac, sizeof(cmac));
1227 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1228 "match");
1229 return -1;
1230 }
1231
1232 return 0;
1233 }
1234
1235
eap_fast_pac_type(u8 * pac,size_t len,u16 type)1236 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1237 {
1238 struct eap_tlv_pac_type_tlv *tlv;
1239
1240 if (pac == NULL || len != sizeof(*tlv))
1241 return 0;
1242
1243 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1244
1245 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1246 be_to_host16(tlv->length) == 2 &&
1247 be_to_host16(tlv->pac_type) == type;
1248 }
1249
1250
eap_fast_process_phase2_tlvs(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_data)1251 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1252 struct eap_fast_data *data,
1253 struct wpabuf *in_data)
1254 {
1255 struct eap_fast_tlv_parse tlv;
1256 int check_crypto_binding = data->state == CRYPTO_BINDING;
1257
1258 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1259 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1260 "Phase 2 TLVs");
1261 return;
1262 }
1263
1264 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1265 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1266 "failure");
1267 eap_fast_state(data, FAILURE);
1268 return;
1269 }
1270
1271 if (data->state == REQUEST_PAC) {
1272 u16 type, len, res;
1273 if (tlv.pac == NULL || tlv.pac_len < 6) {
1274 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1275 "Acknowledgement received");
1276 eap_fast_state(data, FAILURE);
1277 return;
1278 }
1279
1280 type = WPA_GET_BE16(tlv.pac);
1281 len = WPA_GET_BE16(tlv.pac + 2);
1282 res = WPA_GET_BE16(tlv.pac + 4);
1283
1284 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1285 res != EAP_TLV_RESULT_SUCCESS) {
1286 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1287 "contain acknowledgement");
1288 eap_fast_state(data, FAILURE);
1289 return;
1290 }
1291
1292 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1293 "- PAC provisioning succeeded");
1294 eap_fast_state(data, (data->anon_provisioning ||
1295 data->send_new_pac == 2) ?
1296 FAILURE : SUCCESS);
1297 return;
1298 }
1299
1300 if (check_crypto_binding) {
1301 if (tlv.crypto_binding == NULL) {
1302 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1303 "TLV received");
1304 eap_fast_state(data, FAILURE);
1305 return;
1306 }
1307
1308 if (data->final_result &&
1309 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1310 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1311 "without Success Result");
1312 eap_fast_state(data, FAILURE);
1313 return;
1314 }
1315
1316 if (!data->final_result &&
1317 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1318 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1319 "without intermediate Success Result");
1320 eap_fast_state(data, FAILURE);
1321 return;
1322 }
1323
1324 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1325 tlv.crypto_binding_len)) {
1326 eap_fast_state(data, FAILURE);
1327 return;
1328 }
1329
1330 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1331 "received");
1332 if (data->final_result) {
1333 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1334 "completed successfully");
1335 }
1336
1337 if (data->anon_provisioning &&
1338 sm->eap_fast_prov != ANON_PROV &&
1339 sm->eap_fast_prov != BOTH_PROV) {
1340 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1341 "use unauthenticated provisioning which is "
1342 "disabled");
1343 eap_fast_state(data, FAILURE);
1344 return;
1345 }
1346
1347 if (sm->eap_fast_prov != AUTH_PROV &&
1348 sm->eap_fast_prov != BOTH_PROV &&
1349 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1350 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1351 PAC_TYPE_TUNNEL_PAC)) {
1352 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1353 "use authenticated provisioning which is "
1354 "disabled");
1355 eap_fast_state(data, FAILURE);
1356 return;
1357 }
1358
1359 if (data->anon_provisioning ||
1360 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1361 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1362 PAC_TYPE_TUNNEL_PAC))) {
1363 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1364 "Tunnel PAC");
1365 eap_fast_state(data, REQUEST_PAC);
1366 } else if (data->send_new_pac) {
1367 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1368 "re-keying of Tunnel PAC");
1369 eap_fast_state(data, REQUEST_PAC);
1370 } else if (data->final_result)
1371 eap_fast_state(data, SUCCESS);
1372 }
1373
1374 if (tlv.eap_payload_tlv) {
1375 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1376 tlv.eap_payload_tlv_len);
1377 }
1378 }
1379
1380
eap_fast_process_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_buf)1381 static void eap_fast_process_phase2(struct eap_sm *sm,
1382 struct eap_fast_data *data,
1383 struct wpabuf *in_buf)
1384 {
1385 struct wpabuf *in_decrypted;
1386
1387 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1388 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1389
1390 if (data->pending_phase2_resp) {
1391 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1392 "skip decryption and use old data");
1393 eap_fast_process_phase2_tlvs(sm, data,
1394 data->pending_phase2_resp);
1395 wpabuf_free(data->pending_phase2_resp);
1396 data->pending_phase2_resp = NULL;
1397 return;
1398 }
1399
1400 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1401 in_buf);
1402 if (in_decrypted == NULL) {
1403 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1404 "data");
1405 eap_fast_state(data, FAILURE);
1406 return;
1407 }
1408
1409 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1410 in_decrypted);
1411
1412 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1413
1414 if (sm->method_pending == METHOD_PENDING_WAIT) {
1415 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1416 "pending wait state - save decrypted response");
1417 wpabuf_free(data->pending_phase2_resp);
1418 data->pending_phase2_resp = in_decrypted;
1419 return;
1420 }
1421
1422 wpabuf_free(in_decrypted);
1423 }
1424
1425
eap_fast_process_version(struct eap_sm * sm,void * priv,int peer_version)1426 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1427 int peer_version)
1428 {
1429 struct eap_fast_data *data = priv;
1430
1431 data->peer_version = peer_version;
1432
1433 if (data->force_version >= 0 && peer_version != data->force_version) {
1434 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1435 " version (forced=%d peer=%d) - reject",
1436 data->force_version, peer_version);
1437 return -1;
1438 }
1439
1440 if (peer_version < data->fast_version) {
1441 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1442 "use version %d",
1443 peer_version, data->fast_version, peer_version);
1444 data->fast_version = peer_version;
1445 }
1446
1447 return 0;
1448 }
1449
1450
eap_fast_process_phase1(struct eap_sm * sm,struct eap_fast_data * data)1451 static int eap_fast_process_phase1(struct eap_sm *sm,
1452 struct eap_fast_data *data)
1453 {
1454 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1455 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1456 eap_fast_state(data, FAILURE);
1457 return -1;
1458 }
1459
1460 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1461 wpabuf_len(data->ssl.tls_out) > 0)
1462 return 1;
1463
1464 /*
1465 * Phase 1 was completed with the received message (e.g., when using
1466 * abbreviated handshake), so Phase 2 can be started immediately
1467 * without having to send through an empty message to the peer.
1468 */
1469
1470 return eap_fast_phase1_done(sm, data);
1471 }
1472
1473
eap_fast_process_phase2_start(struct eap_sm * sm,struct eap_fast_data * data)1474 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1475 struct eap_fast_data *data)
1476 {
1477 u8 next_type;
1478
1479 if (data->identity) {
1480 os_free(sm->identity);
1481 sm->identity = data->identity;
1482 data->identity = NULL;
1483 sm->identity_len = data->identity_len;
1484 data->identity_len = 0;
1485 sm->require_identity_match = 1;
1486 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1487 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1488 "Phase2 Identity not found "
1489 "in the user database",
1490 sm->identity, sm->identity_len);
1491 next_type = eap_fast_req_failure(sm, data);
1492 } else {
1493 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1494 "known - skip Phase 2 Identity Request");
1495 next_type = sm->user->methods[0].method;
1496 sm->user_eap_method_index = 1;
1497 }
1498
1499 eap_fast_state(data, PHASE2_METHOD);
1500 } else {
1501 eap_fast_state(data, PHASE2_ID);
1502 next_type = EAP_TYPE_IDENTITY;
1503 }
1504
1505 return eap_fast_phase2_init(sm, data, next_type);
1506 }
1507
1508
eap_fast_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1509 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1510 const struct wpabuf *respData)
1511 {
1512 struct eap_fast_data *data = priv;
1513
1514 switch (data->state) {
1515 case PHASE1:
1516 if (eap_fast_process_phase1(sm, data))
1517 break;
1518
1519 /* fall through */
1520 case PHASE2_START:
1521 eap_fast_process_phase2_start(sm, data);
1522 break;
1523 case PHASE2_ID:
1524 case PHASE2_METHOD:
1525 case CRYPTO_BINDING:
1526 case REQUEST_PAC:
1527 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1528 break;
1529 default:
1530 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1531 data->state, __func__);
1532 break;
1533 }
1534 }
1535
1536
eap_fast_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1537 static void eap_fast_process(struct eap_sm *sm, void *priv,
1538 struct wpabuf *respData)
1539 {
1540 struct eap_fast_data *data = priv;
1541 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1542 EAP_TYPE_FAST, eap_fast_process_version,
1543 eap_fast_process_msg) < 0)
1544 eap_fast_state(data, FAILURE);
1545 }
1546
1547
eap_fast_isDone(struct eap_sm * sm,void * priv)1548 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1549 {
1550 struct eap_fast_data *data = priv;
1551 return data->state == SUCCESS || data->state == FAILURE;
1552 }
1553
1554
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1555 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1556 {
1557 struct eap_fast_data *data = priv;
1558 u8 *eapKeyData;
1559
1560 if (data->state != SUCCESS)
1561 return NULL;
1562
1563 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1564 if (eapKeyData == NULL)
1565 return NULL;
1566
1567 if (eap_fast_derive_eap_msk(data->simck, eapKeyData) < 0) {
1568 os_free(eapKeyData);
1569 return NULL;
1570 }
1571 *len = EAP_FAST_KEY_LEN;
1572
1573 return eapKeyData;
1574 }
1575
1576
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1577 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1578 {
1579 struct eap_fast_data *data = priv;
1580 u8 *eapKeyData;
1581
1582 if (data->state != SUCCESS)
1583 return NULL;
1584
1585 eapKeyData = os_malloc(EAP_EMSK_LEN);
1586 if (eapKeyData == NULL)
1587 return NULL;
1588
1589 if (eap_fast_derive_eap_emsk(data->simck, eapKeyData) < 0) {
1590 os_free(eapKeyData);
1591 return NULL;
1592 }
1593 *len = EAP_EMSK_LEN;
1594
1595 return eapKeyData;
1596 }
1597
1598
eap_fast_isSuccess(struct eap_sm * sm,void * priv)1599 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1600 {
1601 struct eap_fast_data *data = priv;
1602 return data->state == SUCCESS;
1603 }
1604
1605
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1606 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1607 {
1608 struct eap_fast_data *data = priv;
1609
1610 if (data->state != SUCCESS)
1611 return NULL;
1612
1613 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1614 len);
1615 }
1616
1617
eap_server_fast_register(void)1618 int eap_server_fast_register(void)
1619 {
1620 struct eap_method *eap;
1621
1622 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1623 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1624 if (eap == NULL)
1625 return -1;
1626
1627 eap->init = eap_fast_init;
1628 eap->reset = eap_fast_reset;
1629 eap->buildReq = eap_fast_buildReq;
1630 eap->check = eap_fast_check;
1631 eap->process = eap_fast_process;
1632 eap->isDone = eap_fast_isDone;
1633 eap->getKey = eap_fast_getKey;
1634 eap->get_emsk = eap_fast_get_emsk;
1635 eap->isSuccess = eap_fast_isSuccess;
1636 eap->getSessionId = eap_fast_get_session_id;
1637
1638 return eap_server_method_register(eap);
1639 }
1640