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 (pos + 1 < end) {
184 if (pos + 2 + pos[1] > end)
185 break;
186
187 switch (*pos) {
188 case PAC_OPAQUE_TYPE_PAD:
189 goto done;
190 case PAC_OPAQUE_TYPE_KEY:
191 if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
192 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
193 "PAC-Key length %d", pos[1]);
194 os_free(buf);
195 return -1;
196 }
197 pac_key = pos + 2;
198 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
199 "decrypted PAC-Opaque",
200 pac_key, EAP_FAST_PAC_KEY_LEN);
201 break;
202 case PAC_OPAQUE_TYPE_LIFETIME:
203 if (pos[1] != 4) {
204 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
205 "PAC-Key lifetime length %d",
206 pos[1]);
207 os_free(buf);
208 return -1;
209 }
210 lifetime = WPA_GET_BE32(pos + 2);
211 break;
212 case PAC_OPAQUE_TYPE_IDENTITY:
213 identity = pos + 2;
214 identity_len = pos[1];
215 break;
216 }
217
218 pos += 2 + pos[1];
219 }
220 done:
221
222 if (pac_key == NULL) {
223 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
224 "PAC-Opaque");
225 os_free(buf);
226 return -1;
227 }
228
229 if (identity) {
230 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
231 "PAC-Opaque", identity, identity_len);
232 os_free(data->identity);
233 data->identity = os_malloc(identity_len);
234 if (data->identity) {
235 os_memcpy(data->identity, identity, identity_len);
236 data->identity_len = identity_len;
237 }
238 }
239
240 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
241 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
242 "(lifetime=%ld now=%ld)", lifetime, now.sec);
243 data->send_new_pac = 2;
244 /*
245 * Allow PAC to be used to allow a PAC update with some level
246 * of server authentication (i.e., do not fall back to full TLS
247 * handshake since we cannot be sure that the peer would be
248 * able to validate server certificate now). However, reject
249 * the authentication since the PAC was not valid anymore. Peer
250 * can connect again with the newly provisioned PAC after this.
251 */
252 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
253 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
254 "an update if authentication succeeds");
255 data->send_new_pac = 1;
256 }
257
258 eap_fast_derive_master_secret(pac_key, server_random, client_random,
259 master_secret);
260
261 os_free(buf);
262
263 return 1;
264 }
265
266
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)267 static void eap_fast_derive_key_auth(struct eap_sm *sm,
268 struct eap_fast_data *data)
269 {
270 u8 *sks;
271
272 /* RFC 4851, Section 5.1:
273 * Extra key material after TLS key_block: session_key_seed[40]
274 */
275
276 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
277 EAP_FAST_SKS_LEN);
278 if (sks == NULL) {
279 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
280 "session_key_seed");
281 return;
282 }
283
284 /*
285 * RFC 4851, Section 5.2:
286 * S-IMCK[0] = session_key_seed
287 */
288 wpa_hexdump_key(MSG_DEBUG,
289 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
290 sks, EAP_FAST_SKS_LEN);
291 data->simck_idx = 0;
292 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
293 os_free(sks);
294 }
295
296
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)297 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
298 struct eap_fast_data *data)
299 {
300 os_free(data->key_block_p);
301 data->key_block_p = (struct eap_fast_key_block_provisioning *)
302 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
303 "key expansion",
304 sizeof(*data->key_block_p));
305 if (data->key_block_p == NULL) {
306 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
307 return;
308 }
309 /*
310 * RFC 4851, Section 5.2:
311 * S-IMCK[0] = session_key_seed
312 */
313 wpa_hexdump_key(MSG_DEBUG,
314 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
315 data->key_block_p->session_key_seed,
316 sizeof(data->key_block_p->session_key_seed));
317 data->simck_idx = 0;
318 os_memcpy(data->simck, data->key_block_p->session_key_seed,
319 EAP_FAST_SIMCK_LEN);
320 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
321 data->key_block_p->server_challenge,
322 sizeof(data->key_block_p->server_challenge));
323 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
324 data->key_block_p->client_challenge,
325 sizeof(data->key_block_p->client_challenge));
326 }
327
328
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)329 static int eap_fast_get_phase2_key(struct eap_sm *sm,
330 struct eap_fast_data *data,
331 u8 *isk, size_t isk_len)
332 {
333 u8 *key;
334 size_t key_len;
335
336 os_memset(isk, 0, isk_len);
337
338 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
339 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
340 "available");
341 return -1;
342 }
343
344 if (data->phase2_method->getKey == NULL)
345 return 0;
346
347 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
348 &key_len)) == NULL) {
349 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
350 "from Phase 2");
351 return -1;
352 }
353
354 if (key_len > isk_len)
355 key_len = isk_len;
356 if (key_len == 32 &&
357 data->phase2_method->vendor == EAP_VENDOR_IETF &&
358 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
359 /*
360 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
361 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
362 * ISK for EAP-FAST cryptobinding.
363 */
364 os_memcpy(isk, key + 16, 16);
365 os_memcpy(isk + 16, key, 16);
366 } else
367 os_memcpy(isk, key, key_len);
368 os_free(key);
369
370 return 0;
371 }
372
373
eap_fast_update_icmk(struct eap_sm * sm,struct eap_fast_data * data)374 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
375 {
376 u8 isk[32], imck[60];
377
378 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
379 data->simck_idx + 1);
380
381 /*
382 * RFC 4851, Section 5.2:
383 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
384 * MSK[j], 60)
385 * S-IMCK[j] = first 40 octets of IMCK[j]
386 * CMK[j] = last 20 octets of IMCK[j]
387 */
388
389 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
390 return -1;
391 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
392 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
393 "Inner Methods Compound Keys",
394 isk, sizeof(isk), imck, sizeof(imck));
395 data->simck_idx++;
396 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
397 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
398 data->simck, EAP_FAST_SIMCK_LEN);
399 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
400 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
401 data->cmk, EAP_FAST_CMK_LEN);
402
403 return 0;
404 }
405
406
eap_fast_init(struct eap_sm * sm)407 static void * eap_fast_init(struct eap_sm *sm)
408 {
409 struct eap_fast_data *data;
410 u8 ciphers[5] = {
411 TLS_CIPHER_ANON_DH_AES128_SHA,
412 TLS_CIPHER_AES128_SHA,
413 TLS_CIPHER_RSA_DHE_AES128_SHA,
414 TLS_CIPHER_RC4_SHA,
415 TLS_CIPHER_NONE
416 };
417
418 data = os_zalloc(sizeof(*data));
419 if (data == NULL)
420 return NULL;
421 data->fast_version = EAP_FAST_VERSION;
422 data->force_version = -1;
423 if (sm->user && sm->user->force_version >= 0) {
424 data->force_version = sm->user->force_version;
425 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
426 data->force_version);
427 data->fast_version = data->force_version;
428 }
429 data->state = START;
430
431 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
432 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
433 eap_fast_reset(sm, data);
434 return NULL;
435 }
436
437 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
438 ciphers) < 0) {
439 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
440 "suites");
441 eap_fast_reset(sm, data);
442 return NULL;
443 }
444
445 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
446 eap_fast_session_ticket_cb,
447 data) < 0) {
448 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
449 "callback");
450 eap_fast_reset(sm, data);
451 return NULL;
452 }
453
454 if (sm->pac_opaque_encr_key == NULL) {
455 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
456 "configured");
457 eap_fast_reset(sm, data);
458 return NULL;
459 }
460 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
461 sizeof(data->pac_opaque_encr));
462
463 if (sm->eap_fast_a_id == NULL) {
464 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
465 eap_fast_reset(sm, data);
466 return NULL;
467 }
468 data->srv_id = os_malloc(sm->eap_fast_a_id_len);
469 if (data->srv_id == NULL) {
470 eap_fast_reset(sm, data);
471 return NULL;
472 }
473 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
474 data->srv_id_len = sm->eap_fast_a_id_len;
475
476 if (sm->eap_fast_a_id_info == NULL) {
477 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
478 eap_fast_reset(sm, data);
479 return NULL;
480 }
481 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
482 if (data->srv_id_info == NULL) {
483 eap_fast_reset(sm, data);
484 return NULL;
485 }
486
487 /* PAC-Key lifetime in seconds (hard limit) */
488 data->pac_key_lifetime = sm->pac_key_lifetime;
489
490 /*
491 * PAC-Key refresh time in seconds (soft limit on remaining hard
492 * limit). The server will generate a new PAC-Key when this number of
493 * seconds (or fewer) of the lifetime remains.
494 */
495 data->pac_key_refresh_time = sm->pac_key_refresh_time;
496
497 return data;
498 }
499
500
eap_fast_reset(struct eap_sm * sm,void * priv)501 static void eap_fast_reset(struct eap_sm *sm, void *priv)
502 {
503 struct eap_fast_data *data = priv;
504 if (data == NULL)
505 return;
506 if (data->phase2_priv && data->phase2_method)
507 data->phase2_method->reset(sm, data->phase2_priv);
508 eap_server_tls_ssl_deinit(sm, &data->ssl);
509 os_free(data->srv_id);
510 os_free(data->srv_id_info);
511 os_free(data->key_block_p);
512 wpabuf_free(data->pending_phase2_resp);
513 os_free(data->identity);
514 bin_clear_free(data, sizeof(*data));
515 }
516
517
eap_fast_build_start(struct eap_sm * sm,struct eap_fast_data * data,u8 id)518 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
519 struct eap_fast_data *data, u8 id)
520 {
521 struct wpabuf *req;
522
523 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
524 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
525 EAP_CODE_REQUEST, id);
526 if (req == NULL) {
527 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
528 " request");
529 eap_fast_state(data, FAILURE);
530 return NULL;
531 }
532
533 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
534
535 /* RFC 4851, 4.1.1. Authority ID Data */
536 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
537
538 eap_fast_state(data, PHASE1);
539
540 return req;
541 }
542
543
eap_fast_phase1_done(struct eap_sm * sm,struct eap_fast_data * data)544 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
545 {
546 char cipher[64];
547
548 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
549
550 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
551 < 0) {
552 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
553 "information");
554 eap_fast_state(data, FAILURE);
555 return -1;
556 }
557 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
558
559 if (data->anon_provisioning) {
560 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
561 eap_fast_derive_key_provisioning(sm, data);
562 } else
563 eap_fast_derive_key_auth(sm, data);
564
565 eap_fast_state(data, PHASE2_START);
566
567 return 0;
568 }
569
570
eap_fast_build_phase2_req(struct eap_sm * sm,struct eap_fast_data * data,u8 id)571 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
572 struct eap_fast_data *data,
573 u8 id)
574 {
575 struct wpabuf *req;
576
577 if (data->phase2_priv == NULL) {
578 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
579 "initialized");
580 return NULL;
581 }
582 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
583 if (req == NULL)
584 return NULL;
585
586 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
587 return eap_fast_tlv_eap_payload(req);
588 }
589
590
eap_fast_build_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data)591 static struct wpabuf * eap_fast_build_crypto_binding(
592 struct eap_sm *sm, struct eap_fast_data *data)
593 {
594 struct wpabuf *buf;
595 struct eap_tlv_result_tlv *result;
596 struct eap_tlv_crypto_binding_tlv *binding;
597
598 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
599 if (buf == NULL)
600 return NULL;
601
602 if (data->send_new_pac || data->anon_provisioning ||
603 data->phase2_method)
604 data->final_result = 0;
605 else
606 data->final_result = 1;
607
608 if (!data->final_result || data->eap_seq > 1) {
609 /* Intermediate-Result */
610 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
611 "(status=SUCCESS)");
612 result = wpabuf_put(buf, sizeof(*result));
613 result->tlv_type = host_to_be16(
614 EAP_TLV_TYPE_MANDATORY |
615 EAP_TLV_INTERMEDIATE_RESULT_TLV);
616 result->length = host_to_be16(2);
617 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
618 }
619
620 if (data->final_result) {
621 /* Result TLV */
622 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
623 "(status=SUCCESS)");
624 result = wpabuf_put(buf, sizeof(*result));
625 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
626 EAP_TLV_RESULT_TLV);
627 result->length = host_to_be16(2);
628 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
629 }
630
631 /* Crypto-Binding TLV */
632 binding = wpabuf_put(buf, sizeof(*binding));
633 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
634 EAP_TLV_CRYPTO_BINDING_TLV);
635 binding->length = host_to_be16(sizeof(*binding) -
636 sizeof(struct eap_tlv_hdr));
637 binding->version = EAP_FAST_VERSION;
638 binding->received_version = data->peer_version;
639 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
640 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
641 wpabuf_free(buf);
642 return NULL;
643 }
644
645 /*
646 * RFC 4851, Section 4.2.8:
647 * The nonce in a request MUST have its least significant bit set to 0.
648 */
649 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
650
651 os_memcpy(data->crypto_binding_nonce, binding->nonce,
652 sizeof(binding->nonce));
653
654 /*
655 * RFC 4851, Section 5.3:
656 * CMK = CMK[j]
657 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
658 */
659
660 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
661 (u8 *) binding, sizeof(*binding),
662 binding->compound_mac);
663
664 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
665 "Received Version %d SubType %d",
666 binding->version, binding->received_version,
667 binding->subtype);
668 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
669 binding->nonce, sizeof(binding->nonce));
670 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
671 binding->compound_mac, sizeof(binding->compound_mac));
672
673 return buf;
674 }
675
676
eap_fast_build_pac(struct eap_sm * sm,struct eap_fast_data * data)677 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
678 struct eap_fast_data *data)
679 {
680 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
681 u8 *pac_buf, *pac_opaque;
682 struct wpabuf *buf;
683 u8 *pos;
684 size_t buf_len, srv_id_info_len, pac_len;
685 struct eap_tlv_hdr *pac_tlv;
686 struct pac_tlv_hdr *pac_info;
687 struct eap_tlv_result_tlv *result;
688 struct os_time now;
689
690 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
691 os_get_time(&now) < 0)
692 return NULL;
693 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
694 pac_key, EAP_FAST_PAC_KEY_LEN);
695
696 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
697 (2 + sm->identity_len) + 8;
698 pac_buf = os_malloc(pac_len);
699 if (pac_buf == NULL)
700 return NULL;
701
702 srv_id_info_len = os_strlen(data->srv_id_info);
703
704 pos = pac_buf;
705 *pos++ = PAC_OPAQUE_TYPE_KEY;
706 *pos++ = EAP_FAST_PAC_KEY_LEN;
707 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
708 pos += EAP_FAST_PAC_KEY_LEN;
709
710 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
711 *pos++ = 4;
712 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
713 pos += 4;
714
715 if (sm->identity) {
716 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
717 *pos++ = sm->identity_len;
718 os_memcpy(pos, sm->identity, sm->identity_len);
719 pos += sm->identity_len;
720 }
721
722 pac_len = pos - pac_buf;
723 while (pac_len % 8) {
724 *pos++ = PAC_OPAQUE_TYPE_PAD;
725 pac_len++;
726 }
727
728 pac_opaque = os_malloc(pac_len + 8);
729 if (pac_opaque == NULL) {
730 os_free(pac_buf);
731 return NULL;
732 }
733 if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
734 pac_len / 8, pac_buf, pac_opaque) < 0) {
735 os_free(pac_buf);
736 os_free(pac_opaque);
737 return NULL;
738 }
739 os_free(pac_buf);
740
741 pac_len += 8;
742 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
743 pac_opaque, pac_len);
744
745 buf_len = sizeof(*pac_tlv) +
746 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
747 sizeof(struct pac_tlv_hdr) + pac_len +
748 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
749 buf = wpabuf_alloc(buf_len);
750 if (buf == NULL) {
751 os_free(pac_opaque);
752 return NULL;
753 }
754
755 /* Result TLV */
756 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
757 result = wpabuf_put(buf, sizeof(*result));
758 WPA_PUT_BE16((u8 *) &result->tlv_type,
759 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
760 WPA_PUT_BE16((u8 *) &result->length, 2);
761 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
762
763 /* PAC TLV */
764 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
765 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
766 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
767 EAP_TLV_PAC_TLV);
768
769 /* PAC-Key */
770 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
771
772 /* PAC-Opaque */
773 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
774 os_free(pac_opaque);
775
776 /* PAC-Info */
777 pac_info = wpabuf_put(buf, sizeof(*pac_info));
778 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
779
780 /* PAC-Lifetime (inside PAC-Info) */
781 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
782 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
783
784 /* A-ID (inside PAC-Info) */
785 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
786
787 /* Note: headers may be misaligned after A-ID */
788
789 if (sm->identity) {
790 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
791 sm->identity_len);
792 }
793
794 /* A-ID-Info (inside PAC-Info) */
795 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
796 srv_id_info_len);
797
798 /* PAC-Type (inside PAC-Info) */
799 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
800 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
801
802 /* Update PAC-Info and PAC TLV Length fields */
803 pos = wpabuf_put(buf, 0);
804 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
805 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
806
807 return buf;
808 }
809
810
eap_fast_encrypt_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * plain,int piggyback)811 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
812 struct eap_fast_data *data,
813 struct wpabuf *plain, int piggyback)
814 {
815 struct wpabuf *encr;
816
817 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
818 plain);
819 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
820 wpabuf_free(plain);
821
822 if (!encr)
823 return -1;
824
825 if (data->ssl.tls_out && piggyback) {
826 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
827 "(len=%d) with last Phase 1 Message (len=%d "
828 "used=%d)",
829 (int) wpabuf_len(encr),
830 (int) wpabuf_len(data->ssl.tls_out),
831 (int) data->ssl.tls_out_pos);
832 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
833 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
834 "output buffer");
835 wpabuf_free(encr);
836 return -1;
837 }
838 wpabuf_put_buf(data->ssl.tls_out, encr);
839 wpabuf_free(encr);
840 } else {
841 wpabuf_free(data->ssl.tls_out);
842 data->ssl.tls_out_pos = 0;
843 data->ssl.tls_out = encr;
844 }
845
846 return 0;
847 }
848
849
eap_fast_buildReq(struct eap_sm * sm,void * priv,u8 id)850 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
851 {
852 struct eap_fast_data *data = priv;
853 struct wpabuf *req = NULL;
854 int piggyback = 0;
855
856 if (data->ssl.state == FRAG_ACK) {
857 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
858 data->fast_version);
859 }
860
861 if (data->ssl.state == WAIT_FRAG_ACK) {
862 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
863 data->fast_version, id);
864 }
865
866 switch (data->state) {
867 case START:
868 return eap_fast_build_start(sm, data, id);
869 case PHASE1:
870 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
871 if (eap_fast_phase1_done(sm, data) < 0)
872 return NULL;
873 if (data->state == PHASE2_START) {
874 /*
875 * Try to generate Phase 2 data to piggyback
876 * with the end of Phase 1 to avoid extra
877 * roundtrip.
878 */
879 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
880 "Phase 2");
881 if (eap_fast_process_phase2_start(sm, data))
882 break;
883 req = eap_fast_build_phase2_req(sm, data, id);
884 piggyback = 1;
885 }
886 }
887 break;
888 case PHASE2_ID:
889 case PHASE2_METHOD:
890 req = eap_fast_build_phase2_req(sm, data, id);
891 break;
892 case CRYPTO_BINDING:
893 req = eap_fast_build_crypto_binding(sm, data);
894 if (data->phase2_method) {
895 /*
896 * Include the start of the next EAP method in the
897 * sequence in the same message with Crypto-Binding to
898 * save a round-trip.
899 */
900 struct wpabuf *eap;
901 eap = eap_fast_build_phase2_req(sm, data, id);
902 req = wpabuf_concat(req, eap);
903 eap_fast_state(data, PHASE2_METHOD);
904 }
905 break;
906 case REQUEST_PAC:
907 req = eap_fast_build_pac(sm, data);
908 break;
909 default:
910 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
911 __func__, data->state);
912 return NULL;
913 }
914
915 if (req &&
916 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
917 return NULL;
918
919 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
920 data->fast_version, id);
921 }
922
923
eap_fast_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)924 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
925 struct wpabuf *respData)
926 {
927 const u8 *pos;
928 size_t len;
929
930 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
931 if (pos == NULL || len < 1) {
932 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
933 return TRUE;
934 }
935
936 return FALSE;
937 }
938
939
eap_fast_phase2_init(struct eap_sm * sm,struct eap_fast_data * data,EapType eap_type)940 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
941 EapType eap_type)
942 {
943 if (data->phase2_priv && data->phase2_method) {
944 data->phase2_method->reset(sm, data->phase2_priv);
945 data->phase2_method = NULL;
946 data->phase2_priv = NULL;
947 }
948 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
949 eap_type);
950 if (!data->phase2_method)
951 return -1;
952
953 if (data->key_block_p) {
954 sm->auth_challenge = data->key_block_p->server_challenge;
955 sm->peer_challenge = data->key_block_p->client_challenge;
956 }
957 sm->init_phase2 = 1;
958 data->phase2_priv = data->phase2_method->init(sm);
959 sm->init_phase2 = 0;
960 sm->auth_challenge = NULL;
961 sm->peer_challenge = NULL;
962
963 return data->phase2_priv == NULL ? -1 : 0;
964 }
965
966
eap_fast_process_phase2_response(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)967 static void eap_fast_process_phase2_response(struct eap_sm *sm,
968 struct eap_fast_data *data,
969 u8 *in_data, size_t in_len)
970 {
971 u8 next_type = EAP_TYPE_NONE;
972 struct eap_hdr *hdr;
973 u8 *pos;
974 size_t left;
975 struct wpabuf buf;
976 const struct eap_method *m = data->phase2_method;
977 void *priv = data->phase2_priv;
978
979 if (priv == NULL) {
980 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
981 "initialized?!", __func__);
982 return;
983 }
984
985 hdr = (struct eap_hdr *) in_data;
986 pos = (u8 *) (hdr + 1);
987
988 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
989 left = in_len - sizeof(*hdr);
990 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
991 "allowed types", pos + 1, left - 1);
992 #ifdef EAP_SERVER_TNC
993 if (m && m->vendor == EAP_VENDOR_IETF &&
994 m->method == EAP_TYPE_TNC) {
995 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
996 "TNC negotiation");
997 next_type = eap_fast_req_failure(sm, data);
998 eap_fast_phase2_init(sm, data, next_type);
999 return;
1000 }
1001 #endif /* EAP_SERVER_TNC */
1002 eap_sm_process_nak(sm, pos + 1, left - 1);
1003 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1004 sm->user->methods[sm->user_eap_method_index].method !=
1005 EAP_TYPE_NONE) {
1006 next_type = sm->user->methods[
1007 sm->user_eap_method_index++].method;
1008 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1009 next_type);
1010 } else {
1011 next_type = eap_fast_req_failure(sm, data);
1012 }
1013 eap_fast_phase2_init(sm, data, next_type);
1014 return;
1015 }
1016
1017 wpabuf_set(&buf, in_data, in_len);
1018
1019 if (m->check(sm, priv, &buf)) {
1020 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1021 "ignore the packet");
1022 eap_fast_req_failure(sm, data);
1023 return;
1024 }
1025
1026 m->process(sm, priv, &buf);
1027
1028 if (!m->isDone(sm, priv))
1029 return;
1030
1031 if (!m->isSuccess(sm, priv)) {
1032 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1033 next_type = eap_fast_req_failure(sm, data);
1034 eap_fast_phase2_init(sm, data, next_type);
1035 return;
1036 }
1037
1038 switch (data->state) {
1039 case PHASE2_ID:
1040 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1041 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1042 "Identity not found in the user "
1043 "database",
1044 sm->identity, sm->identity_len);
1045 next_type = eap_fast_req_failure(sm, data);
1046 break;
1047 }
1048
1049 eap_fast_state(data, PHASE2_METHOD);
1050 if (data->anon_provisioning) {
1051 /*
1052 * Only EAP-MSCHAPv2 is allowed for anonymous
1053 * provisioning.
1054 */
1055 next_type = EAP_TYPE_MSCHAPV2;
1056 sm->user_eap_method_index = 0;
1057 } else {
1058 next_type = sm->user->methods[0].method;
1059 sm->user_eap_method_index = 1;
1060 }
1061 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1062 break;
1063 case PHASE2_METHOD:
1064 case CRYPTO_BINDING:
1065 eap_fast_update_icmk(sm, data);
1066 eap_fast_state(data, CRYPTO_BINDING);
1067 data->eap_seq++;
1068 next_type = EAP_TYPE_NONE;
1069 #ifdef EAP_SERVER_TNC
1070 if (sm->tnc && !data->tnc_started) {
1071 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1072 next_type = EAP_TYPE_TNC;
1073 data->tnc_started = 1;
1074 }
1075 #endif /* EAP_SERVER_TNC */
1076 break;
1077 case FAILURE:
1078 break;
1079 default:
1080 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1081 __func__, data->state);
1082 break;
1083 }
1084
1085 eap_fast_phase2_init(sm, data, next_type);
1086 }
1087
1088
eap_fast_process_phase2_eap(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)1089 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1090 struct eap_fast_data *data,
1091 u8 *in_data, size_t in_len)
1092 {
1093 struct eap_hdr *hdr;
1094 size_t len;
1095
1096 hdr = (struct eap_hdr *) in_data;
1097 if (in_len < (int) sizeof(*hdr)) {
1098 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1099 "EAP frame (len=%lu)", (unsigned long) in_len);
1100 eap_fast_req_failure(sm, data);
1101 return;
1102 }
1103 len = be_to_host16(hdr->length);
1104 if (len > in_len) {
1105 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1106 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1107 (unsigned long) in_len, (unsigned long) len);
1108 eap_fast_req_failure(sm, data);
1109 return;
1110 }
1111 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1112 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1113 (unsigned long) len);
1114 switch (hdr->code) {
1115 case EAP_CODE_RESPONSE:
1116 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1117 break;
1118 default:
1119 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1120 "Phase 2 EAP header", hdr->code);
1121 break;
1122 }
1123 }
1124
1125
eap_fast_parse_tlvs(struct wpabuf * data,struct eap_fast_tlv_parse * tlv)1126 static int eap_fast_parse_tlvs(struct wpabuf *data,
1127 struct eap_fast_tlv_parse *tlv)
1128 {
1129 int mandatory, tlv_type, res;
1130 size_t len;
1131 u8 *pos, *end;
1132
1133 os_memset(tlv, 0, sizeof(*tlv));
1134
1135 pos = wpabuf_mhead(data);
1136 end = pos + wpabuf_len(data);
1137 while (pos + 4 < end) {
1138 mandatory = pos[0] & 0x80;
1139 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1140 pos += 2;
1141 len = WPA_GET_BE16(pos);
1142 pos += 2;
1143 if (len > (size_t) (end - pos)) {
1144 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1145 return -1;
1146 }
1147 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1148 "TLV type %d length %u%s",
1149 tlv_type, (unsigned int) len,
1150 mandatory ? " (mandatory)" : "");
1151
1152 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1153 if (res == -2)
1154 break;
1155 if (res < 0) {
1156 if (mandatory) {
1157 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1158 "mandatory TLV type %d", tlv_type);
1159 /* TODO: generate Nak TLV */
1160 break;
1161 } else {
1162 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1163 "unknown optional TLV type %d",
1164 tlv_type);
1165 }
1166 }
1167
1168 pos += len;
1169 }
1170
1171 return 0;
1172 }
1173
1174
eap_fast_validate_crypto_binding(struct eap_fast_data * data,struct eap_tlv_crypto_binding_tlv * b,size_t bind_len)1175 static int eap_fast_validate_crypto_binding(
1176 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1177 size_t bind_len)
1178 {
1179 u8 cmac[SHA1_MAC_LEN];
1180
1181 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1182 "Version %d Received Version %d SubType %d",
1183 b->version, b->received_version, b->subtype);
1184 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1185 b->nonce, sizeof(b->nonce));
1186 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1187 b->compound_mac, sizeof(b->compound_mac));
1188
1189 if (b->version != EAP_FAST_VERSION ||
1190 b->received_version != EAP_FAST_VERSION) {
1191 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1192 "in Crypto-Binding: version %d "
1193 "received_version %d", b->version,
1194 b->received_version);
1195 return -1;
1196 }
1197
1198 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1199 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1200 "Crypto-Binding: %d", b->subtype);
1201 return -1;
1202 }
1203
1204 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1205 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1206 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1207 "Crypto-Binding");
1208 return -1;
1209 }
1210
1211 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1212 os_memset(b->compound_mac, 0, sizeof(cmac));
1213 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1214 "Compound MAC calculation",
1215 (u8 *) b, bind_len);
1216 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1217 b->compound_mac);
1218 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1219 wpa_hexdump(MSG_MSGDUMP,
1220 "EAP-FAST: Calculated Compound MAC",
1221 b->compound_mac, sizeof(cmac));
1222 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1223 "match");
1224 return -1;
1225 }
1226
1227 return 0;
1228 }
1229
1230
eap_fast_pac_type(u8 * pac,size_t len,u16 type)1231 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1232 {
1233 struct eap_tlv_pac_type_tlv *tlv;
1234
1235 if (pac == NULL || len != sizeof(*tlv))
1236 return 0;
1237
1238 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1239
1240 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1241 be_to_host16(tlv->length) == 2 &&
1242 be_to_host16(tlv->pac_type) == type;
1243 }
1244
1245
eap_fast_process_phase2_tlvs(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_data)1246 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1247 struct eap_fast_data *data,
1248 struct wpabuf *in_data)
1249 {
1250 struct eap_fast_tlv_parse tlv;
1251 int check_crypto_binding = data->state == CRYPTO_BINDING;
1252
1253 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1254 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1255 "Phase 2 TLVs");
1256 return;
1257 }
1258
1259 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1260 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1261 "failure");
1262 eap_fast_state(data, FAILURE);
1263 return;
1264 }
1265
1266 if (data->state == REQUEST_PAC) {
1267 u16 type, len, res;
1268 if (tlv.pac == NULL || tlv.pac_len < 6) {
1269 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1270 "Acknowledgement received");
1271 eap_fast_state(data, FAILURE);
1272 return;
1273 }
1274
1275 type = WPA_GET_BE16(tlv.pac);
1276 len = WPA_GET_BE16(tlv.pac + 2);
1277 res = WPA_GET_BE16(tlv.pac + 4);
1278
1279 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1280 res != EAP_TLV_RESULT_SUCCESS) {
1281 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1282 "contain acknowledgement");
1283 eap_fast_state(data, FAILURE);
1284 return;
1285 }
1286
1287 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1288 "- PAC provisioning succeeded");
1289 eap_fast_state(data, (data->anon_provisioning ||
1290 data->send_new_pac == 2) ?
1291 FAILURE : SUCCESS);
1292 return;
1293 }
1294
1295 if (check_crypto_binding) {
1296 if (tlv.crypto_binding == NULL) {
1297 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1298 "TLV received");
1299 eap_fast_state(data, FAILURE);
1300 return;
1301 }
1302
1303 if (data->final_result &&
1304 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1305 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1306 "without Success Result");
1307 eap_fast_state(data, FAILURE);
1308 return;
1309 }
1310
1311 if (!data->final_result &&
1312 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1313 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1314 "without intermediate Success Result");
1315 eap_fast_state(data, FAILURE);
1316 return;
1317 }
1318
1319 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1320 tlv.crypto_binding_len)) {
1321 eap_fast_state(data, FAILURE);
1322 return;
1323 }
1324
1325 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1326 "received");
1327 if (data->final_result) {
1328 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1329 "completed successfully");
1330 }
1331
1332 if (data->anon_provisioning &&
1333 sm->eap_fast_prov != ANON_PROV &&
1334 sm->eap_fast_prov != BOTH_PROV) {
1335 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1336 "use unauthenticated provisioning which is "
1337 "disabled");
1338 eap_fast_state(data, FAILURE);
1339 return;
1340 }
1341
1342 if (sm->eap_fast_prov != AUTH_PROV &&
1343 sm->eap_fast_prov != BOTH_PROV &&
1344 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1345 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1346 PAC_TYPE_TUNNEL_PAC)) {
1347 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1348 "use authenticated provisioning which is "
1349 "disabled");
1350 eap_fast_state(data, FAILURE);
1351 return;
1352 }
1353
1354 if (data->anon_provisioning ||
1355 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1356 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1357 PAC_TYPE_TUNNEL_PAC))) {
1358 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1359 "Tunnel PAC");
1360 eap_fast_state(data, REQUEST_PAC);
1361 } else if (data->send_new_pac) {
1362 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1363 "re-keying of Tunnel PAC");
1364 eap_fast_state(data, REQUEST_PAC);
1365 } else if (data->final_result)
1366 eap_fast_state(data, SUCCESS);
1367 }
1368
1369 if (tlv.eap_payload_tlv) {
1370 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1371 tlv.eap_payload_tlv_len);
1372 }
1373 }
1374
1375
eap_fast_process_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_buf)1376 static void eap_fast_process_phase2(struct eap_sm *sm,
1377 struct eap_fast_data *data,
1378 struct wpabuf *in_buf)
1379 {
1380 struct wpabuf *in_decrypted;
1381
1382 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1383 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1384
1385 if (data->pending_phase2_resp) {
1386 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1387 "skip decryption and use old data");
1388 eap_fast_process_phase2_tlvs(sm, data,
1389 data->pending_phase2_resp);
1390 wpabuf_free(data->pending_phase2_resp);
1391 data->pending_phase2_resp = NULL;
1392 return;
1393 }
1394
1395 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1396 in_buf);
1397 if (in_decrypted == NULL) {
1398 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1399 "data");
1400 eap_fast_state(data, FAILURE);
1401 return;
1402 }
1403
1404 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1405 in_decrypted);
1406
1407 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1408
1409 if (sm->method_pending == METHOD_PENDING_WAIT) {
1410 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1411 "pending wait state - save decrypted response");
1412 wpabuf_free(data->pending_phase2_resp);
1413 data->pending_phase2_resp = in_decrypted;
1414 return;
1415 }
1416
1417 wpabuf_free(in_decrypted);
1418 }
1419
1420
eap_fast_process_version(struct eap_sm * sm,void * priv,int peer_version)1421 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1422 int peer_version)
1423 {
1424 struct eap_fast_data *data = priv;
1425
1426 data->peer_version = peer_version;
1427
1428 if (data->force_version >= 0 && peer_version != data->force_version) {
1429 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1430 " version (forced=%d peer=%d) - reject",
1431 data->force_version, peer_version);
1432 return -1;
1433 }
1434
1435 if (peer_version < data->fast_version) {
1436 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1437 "use version %d",
1438 peer_version, data->fast_version, peer_version);
1439 data->fast_version = peer_version;
1440 }
1441
1442 return 0;
1443 }
1444
1445
eap_fast_process_phase1(struct eap_sm * sm,struct eap_fast_data * data)1446 static int eap_fast_process_phase1(struct eap_sm *sm,
1447 struct eap_fast_data *data)
1448 {
1449 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1450 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1451 eap_fast_state(data, FAILURE);
1452 return -1;
1453 }
1454
1455 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1456 wpabuf_len(data->ssl.tls_out) > 0)
1457 return 1;
1458
1459 /*
1460 * Phase 1 was completed with the received message (e.g., when using
1461 * abbreviated handshake), so Phase 2 can be started immediately
1462 * without having to send through an empty message to the peer.
1463 */
1464
1465 return eap_fast_phase1_done(sm, data);
1466 }
1467
1468
eap_fast_process_phase2_start(struct eap_sm * sm,struct eap_fast_data * data)1469 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1470 struct eap_fast_data *data)
1471 {
1472 u8 next_type;
1473
1474 if (data->identity) {
1475 os_free(sm->identity);
1476 sm->identity = data->identity;
1477 data->identity = NULL;
1478 sm->identity_len = data->identity_len;
1479 data->identity_len = 0;
1480 sm->require_identity_match = 1;
1481 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1482 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1483 "Phase2 Identity not found "
1484 "in the user database",
1485 sm->identity, sm->identity_len);
1486 next_type = eap_fast_req_failure(sm, data);
1487 } else {
1488 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1489 "known - skip Phase 2 Identity Request");
1490 next_type = sm->user->methods[0].method;
1491 sm->user_eap_method_index = 1;
1492 }
1493
1494 eap_fast_state(data, PHASE2_METHOD);
1495 } else {
1496 eap_fast_state(data, PHASE2_ID);
1497 next_type = EAP_TYPE_IDENTITY;
1498 }
1499
1500 return eap_fast_phase2_init(sm, data, next_type);
1501 }
1502
1503
eap_fast_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1504 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1505 const struct wpabuf *respData)
1506 {
1507 struct eap_fast_data *data = priv;
1508
1509 switch (data->state) {
1510 case PHASE1:
1511 if (eap_fast_process_phase1(sm, data))
1512 break;
1513
1514 /* fall through to PHASE2_START */
1515 case PHASE2_START:
1516 eap_fast_process_phase2_start(sm, data);
1517 break;
1518 case PHASE2_ID:
1519 case PHASE2_METHOD:
1520 case CRYPTO_BINDING:
1521 case REQUEST_PAC:
1522 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1523 break;
1524 default:
1525 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1526 data->state, __func__);
1527 break;
1528 }
1529 }
1530
1531
eap_fast_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1532 static void eap_fast_process(struct eap_sm *sm, void *priv,
1533 struct wpabuf *respData)
1534 {
1535 struct eap_fast_data *data = priv;
1536 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1537 EAP_TYPE_FAST, eap_fast_process_version,
1538 eap_fast_process_msg) < 0)
1539 eap_fast_state(data, FAILURE);
1540 }
1541
1542
eap_fast_isDone(struct eap_sm * sm,void * priv)1543 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1544 {
1545 struct eap_fast_data *data = priv;
1546 return data->state == SUCCESS || data->state == FAILURE;
1547 }
1548
1549
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1550 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1551 {
1552 struct eap_fast_data *data = priv;
1553 u8 *eapKeyData;
1554
1555 if (data->state != SUCCESS)
1556 return NULL;
1557
1558 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1559 if (eapKeyData == NULL)
1560 return NULL;
1561
1562 eap_fast_derive_eap_msk(data->simck, eapKeyData);
1563 *len = EAP_FAST_KEY_LEN;
1564
1565 return eapKeyData;
1566 }
1567
1568
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1569 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1570 {
1571 struct eap_fast_data *data = priv;
1572 u8 *eapKeyData;
1573
1574 if (data->state != SUCCESS)
1575 return NULL;
1576
1577 eapKeyData = os_malloc(EAP_EMSK_LEN);
1578 if (eapKeyData == NULL)
1579 return NULL;
1580
1581 eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1582 *len = EAP_EMSK_LEN;
1583
1584 return eapKeyData;
1585 }
1586
1587
eap_fast_isSuccess(struct eap_sm * sm,void * priv)1588 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1589 {
1590 struct eap_fast_data *data = priv;
1591 return data->state == SUCCESS;
1592 }
1593
1594
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1595 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1596 {
1597 struct eap_fast_data *data = priv;
1598
1599 if (data->state != SUCCESS)
1600 return NULL;
1601
1602 return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1603 len);
1604 }
1605
1606
eap_server_fast_register(void)1607 int eap_server_fast_register(void)
1608 {
1609 struct eap_method *eap;
1610 int ret;
1611
1612 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1613 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1614 if (eap == NULL)
1615 return -1;
1616
1617 eap->init = eap_fast_init;
1618 eap->reset = eap_fast_reset;
1619 eap->buildReq = eap_fast_buildReq;
1620 eap->check = eap_fast_check;
1621 eap->process = eap_fast_process;
1622 eap->isDone = eap_fast_isDone;
1623 eap->getKey = eap_fast_getKey;
1624 eap->get_emsk = eap_fast_get_emsk;
1625 eap->isSuccess = eap_fast_isSuccess;
1626 eap->getSessionId = eap_fast_get_session_id;
1627
1628 ret = eap_server_method_register(eap);
1629 if (ret)
1630 eap_server_method_free(eap);
1631 return ret;
1632 }
1633