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, (pac_opaque_len - 8) / 8,
165 pac_opaque, buf) < 0) {
166 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167 "PAC-Opaque");
168 os_free(buf);
169 /*
170 * This may have been caused by server changing the PAC-Opaque
171 * encryption key, so just ignore this PAC-Opaque instead of
172 * failing the authentication completely. Provisioning can now
173 * be used to provision a new PAC.
174 */
175 return 0;
176 }
177
178 end = buf + pac_opaque_len - 8;
179 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 buf, end - buf);
181
182 pos = buf;
183 while (pos + 1 < end) {
184 if (pos + 2 + pos[1] > end)
185 break;
186
187 switch (*pos) {
188 case PAC_OPAQUE_TYPE_PAD:
189 pos = end;
190 goto done;
191 case PAC_OPAQUE_TYPE_KEY:
192 if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
193 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
194 "PAC-Key length %d", pos[1]);
195 os_free(buf);
196 return -1;
197 }
198 pac_key = pos + 2;
199 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
200 "decrypted PAC-Opaque",
201 pac_key, EAP_FAST_PAC_KEY_LEN);
202 break;
203 case PAC_OPAQUE_TYPE_LIFETIME:
204 if (pos[1] != 4) {
205 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
206 "PAC-Key lifetime length %d",
207 pos[1]);
208 os_free(buf);
209 return -1;
210 }
211 lifetime = WPA_GET_BE32(pos + 2);
212 break;
213 case PAC_OPAQUE_TYPE_IDENTITY:
214 identity = pos + 2;
215 identity_len = pos[1];
216 break;
217 }
218
219 pos += 2 + pos[1];
220 }
221 done:
222
223 if (pac_key == NULL) {
224 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
225 "PAC-Opaque");
226 os_free(buf);
227 return -1;
228 }
229
230 if (identity) {
231 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
232 "PAC-Opaque", identity, identity_len);
233 os_free(data->identity);
234 data->identity = os_malloc(identity_len);
235 if (data->identity) {
236 os_memcpy(data->identity, identity, identity_len);
237 data->identity_len = identity_len;
238 }
239 }
240
241 if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
242 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
243 "(lifetime=%ld now=%ld)", lifetime, now.sec);
244 data->send_new_pac = 2;
245 /*
246 * Allow PAC to be used to allow a PAC update with some level
247 * of server authentication (i.e., do not fall back to full TLS
248 * handshake since we cannot be sure that the peer would be
249 * able to validate server certificate now). However, reject
250 * the authentication since the PAC was not valid anymore. Peer
251 * can connect again with the newly provisioned PAC after this.
252 */
253 } else if (lifetime - now.sec < data->pac_key_refresh_time) {
254 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
255 "an update if authentication succeeds");
256 data->send_new_pac = 1;
257 }
258
259 eap_fast_derive_master_secret(pac_key, server_random, client_random,
260 master_secret);
261
262 os_free(buf);
263
264 return 1;
265 }
266
267
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)268 static void eap_fast_derive_key_auth(struct eap_sm *sm,
269 struct eap_fast_data *data)
270 {
271 u8 *sks;
272
273 /* RFC 4851, Section 5.1:
274 * Extra key material after TLS key_block: session_key_seed[40]
275 */
276
277 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
278 EAP_FAST_SKS_LEN);
279 if (sks == NULL) {
280 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
281 "session_key_seed");
282 return;
283 }
284
285 /*
286 * RFC 4851, Section 5.2:
287 * S-IMCK[0] = session_key_seed
288 */
289 wpa_hexdump_key(MSG_DEBUG,
290 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
291 sks, EAP_FAST_SKS_LEN);
292 data->simck_idx = 0;
293 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
294 os_free(sks);
295 }
296
297
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)298 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
299 struct eap_fast_data *data)
300 {
301 os_free(data->key_block_p);
302 data->key_block_p = (struct eap_fast_key_block_provisioning *)
303 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
304 "key expansion",
305 sizeof(*data->key_block_p));
306 if (data->key_block_p == NULL) {
307 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
308 return;
309 }
310 /*
311 * RFC 4851, Section 5.2:
312 * S-IMCK[0] = session_key_seed
313 */
314 wpa_hexdump_key(MSG_DEBUG,
315 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
316 data->key_block_p->session_key_seed,
317 sizeof(data->key_block_p->session_key_seed));
318 data->simck_idx = 0;
319 os_memcpy(data->simck, data->key_block_p->session_key_seed,
320 EAP_FAST_SIMCK_LEN);
321 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
322 data->key_block_p->server_challenge,
323 sizeof(data->key_block_p->server_challenge));
324 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
325 data->key_block_p->client_challenge,
326 sizeof(data->key_block_p->client_challenge));
327 }
328
329
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)330 static int eap_fast_get_phase2_key(struct eap_sm *sm,
331 struct eap_fast_data *data,
332 u8 *isk, size_t isk_len)
333 {
334 u8 *key;
335 size_t key_len;
336
337 os_memset(isk, 0, isk_len);
338
339 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
340 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
341 "available");
342 return -1;
343 }
344
345 if (data->phase2_method->getKey == NULL)
346 return 0;
347
348 if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
349 &key_len)) == NULL) {
350 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
351 "from Phase 2");
352 return -1;
353 }
354
355 if (key_len > isk_len)
356 key_len = isk_len;
357 if (key_len == 32 &&
358 data->phase2_method->vendor == EAP_VENDOR_IETF &&
359 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
360 /*
361 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
362 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
363 * ISK for EAP-FAST cryptobinding.
364 */
365 os_memcpy(isk, key + 16, 16);
366 os_memcpy(isk + 16, key, 16);
367 } else
368 os_memcpy(isk, key, key_len);
369 os_free(key);
370
371 return 0;
372 }
373
374
eap_fast_update_icmk(struct eap_sm * sm,struct eap_fast_data * data)375 static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
376 {
377 u8 isk[32], imck[60];
378
379 wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
380 data->simck_idx + 1);
381
382 /*
383 * RFC 4851, Section 5.2:
384 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
385 * MSK[j], 60)
386 * S-IMCK[j] = first 40 octets of IMCK[j]
387 * CMK[j] = last 20 octets of IMCK[j]
388 */
389
390 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
391 return -1;
392 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
393 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
394 "Inner Methods Compound Keys",
395 isk, sizeof(isk), imck, sizeof(imck));
396 data->simck_idx++;
397 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
398 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
399 data->simck, EAP_FAST_SIMCK_LEN);
400 os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
401 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
402 data->cmk, EAP_FAST_CMK_LEN);
403
404 return 0;
405 }
406
407
eap_fast_init(struct eap_sm * sm)408 static void * eap_fast_init(struct eap_sm *sm)
409 {
410 struct eap_fast_data *data;
411 u8 ciphers[5] = {
412 TLS_CIPHER_ANON_DH_AES128_SHA,
413 TLS_CIPHER_AES128_SHA,
414 TLS_CIPHER_RSA_DHE_AES128_SHA,
415 TLS_CIPHER_RC4_SHA,
416 TLS_CIPHER_NONE
417 };
418
419 data = os_zalloc(sizeof(*data));
420 if (data == NULL)
421 return NULL;
422 data->fast_version = EAP_FAST_VERSION;
423 data->force_version = -1;
424 if (sm->user && sm->user->force_version >= 0) {
425 data->force_version = sm->user->force_version;
426 wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
427 data->force_version);
428 data->fast_version = data->force_version;
429 }
430 data->state = START;
431
432 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
433 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
434 eap_fast_reset(sm, data);
435 return NULL;
436 }
437
438 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
439 ciphers) < 0) {
440 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
441 "suites");
442 eap_fast_reset(sm, data);
443 return NULL;
444 }
445
446 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
447 eap_fast_session_ticket_cb,
448 data) < 0) {
449 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
450 "callback");
451 eap_fast_reset(sm, data);
452 return NULL;
453 }
454
455 if (sm->pac_opaque_encr_key == NULL) {
456 wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
457 "configured");
458 eap_fast_reset(sm, data);
459 return NULL;
460 }
461 os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
462 sizeof(data->pac_opaque_encr));
463
464 if (sm->eap_fast_a_id == NULL) {
465 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
466 eap_fast_reset(sm, data);
467 return NULL;
468 }
469 data->srv_id = os_malloc(sm->eap_fast_a_id_len);
470 if (data->srv_id == NULL) {
471 eap_fast_reset(sm, data);
472 return NULL;
473 }
474 os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
475 data->srv_id_len = sm->eap_fast_a_id_len;
476
477 if (sm->eap_fast_a_id_info == NULL) {
478 wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
479 eap_fast_reset(sm, data);
480 return NULL;
481 }
482 data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
483 if (data->srv_id_info == NULL) {
484 eap_fast_reset(sm, data);
485 return NULL;
486 }
487
488 /* PAC-Key lifetime in seconds (hard limit) */
489 data->pac_key_lifetime = sm->pac_key_lifetime;
490
491 /*
492 * PAC-Key refresh time in seconds (soft limit on remaining hard
493 * limit). The server will generate a new PAC-Key when this number of
494 * seconds (or fewer) of the lifetime remains.
495 */
496 data->pac_key_refresh_time = sm->pac_key_refresh_time;
497
498 return data;
499 }
500
501
eap_fast_reset(struct eap_sm * sm,void * priv)502 static void eap_fast_reset(struct eap_sm *sm, void *priv)
503 {
504 struct eap_fast_data *data = priv;
505 if (data == NULL)
506 return;
507 if (data->phase2_priv && data->phase2_method)
508 data->phase2_method->reset(sm, data->phase2_priv);
509 eap_server_tls_ssl_deinit(sm, &data->ssl);
510 os_free(data->srv_id);
511 os_free(data->srv_id_info);
512 os_free(data->key_block_p);
513 wpabuf_free(data->pending_phase2_resp);
514 os_free(data->identity);
515 bin_clear_free(data, sizeof(*data));
516 }
517
518
eap_fast_build_start(struct eap_sm * sm,struct eap_fast_data * data,u8 id)519 static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
520 struct eap_fast_data *data, u8 id)
521 {
522 struct wpabuf *req;
523
524 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
525 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
526 EAP_CODE_REQUEST, id);
527 if (req == NULL) {
528 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
529 " request");
530 eap_fast_state(data, FAILURE);
531 return NULL;
532 }
533
534 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
535
536 /* RFC 4851, 4.1.1. Authority ID Data */
537 eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
538
539 eap_fast_state(data, PHASE1);
540
541 return req;
542 }
543
544
eap_fast_phase1_done(struct eap_sm * sm,struct eap_fast_data * data)545 static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
546 {
547 char cipher[64];
548
549 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
550
551 if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
552 < 0) {
553 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
554 "information");
555 eap_fast_state(data, FAILURE);
556 return -1;
557 }
558 data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
559
560 if (data->anon_provisioning) {
561 wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
562 eap_fast_derive_key_provisioning(sm, data);
563 } else
564 eap_fast_derive_key_auth(sm, data);
565
566 eap_fast_state(data, PHASE2_START);
567
568 return 0;
569 }
570
571
eap_fast_build_phase2_req(struct eap_sm * sm,struct eap_fast_data * data,u8 id)572 static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
573 struct eap_fast_data *data,
574 u8 id)
575 {
576 struct wpabuf *req;
577
578 if (data->phase2_priv == NULL) {
579 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
580 "initialized");
581 return NULL;
582 }
583 req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
584 if (req == NULL)
585 return NULL;
586
587 wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
588 return eap_fast_tlv_eap_payload(req);
589 }
590
591
eap_fast_build_crypto_binding(struct eap_sm * sm,struct eap_fast_data * data)592 static struct wpabuf * eap_fast_build_crypto_binding(
593 struct eap_sm *sm, struct eap_fast_data *data)
594 {
595 struct wpabuf *buf;
596 struct eap_tlv_result_tlv *result;
597 struct eap_tlv_crypto_binding_tlv *binding;
598
599 buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
600 if (buf == NULL)
601 return NULL;
602
603 if (data->send_new_pac || data->anon_provisioning ||
604 data->phase2_method)
605 data->final_result = 0;
606 else
607 data->final_result = 1;
608
609 if (!data->final_result || data->eap_seq > 1) {
610 /* Intermediate-Result */
611 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
612 "(status=SUCCESS)");
613 result = wpabuf_put(buf, sizeof(*result));
614 result->tlv_type = host_to_be16(
615 EAP_TLV_TYPE_MANDATORY |
616 EAP_TLV_INTERMEDIATE_RESULT_TLV);
617 result->length = host_to_be16(2);
618 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
619 }
620
621 if (data->final_result) {
622 /* Result TLV */
623 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
624 "(status=SUCCESS)");
625 result = wpabuf_put(buf, sizeof(*result));
626 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
627 EAP_TLV_RESULT_TLV);
628 result->length = host_to_be16(2);
629 result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
630 }
631
632 /* Crypto-Binding TLV */
633 binding = wpabuf_put(buf, sizeof(*binding));
634 binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
635 EAP_TLV_CRYPTO_BINDING_TLV);
636 binding->length = host_to_be16(sizeof(*binding) -
637 sizeof(struct eap_tlv_hdr));
638 binding->version = EAP_FAST_VERSION;
639 binding->received_version = data->peer_version;
640 binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
641 if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
642 wpabuf_free(buf);
643 return NULL;
644 }
645
646 /*
647 * RFC 4851, Section 4.2.8:
648 * The nonce in a request MUST have its least significant bit set to 0.
649 */
650 binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
651
652 os_memcpy(data->crypto_binding_nonce, binding->nonce,
653 sizeof(binding->nonce));
654
655 /*
656 * RFC 4851, Section 5.3:
657 * CMK = CMK[j]
658 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
659 */
660
661 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
662 (u8 *) binding, sizeof(*binding),
663 binding->compound_mac);
664
665 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
666 "Received Version %d SubType %d",
667 binding->version, binding->received_version,
668 binding->subtype);
669 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
670 binding->nonce, sizeof(binding->nonce));
671 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
672 binding->compound_mac, sizeof(binding->compound_mac));
673
674 return buf;
675 }
676
677
eap_fast_build_pac(struct eap_sm * sm,struct eap_fast_data * data)678 static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
679 struct eap_fast_data *data)
680 {
681 u8 pac_key[EAP_FAST_PAC_KEY_LEN];
682 u8 *pac_buf, *pac_opaque;
683 struct wpabuf *buf;
684 u8 *pos;
685 size_t buf_len, srv_id_info_len, pac_len;
686 struct eap_tlv_hdr *pac_tlv;
687 struct pac_tlv_hdr *pac_info;
688 struct eap_tlv_result_tlv *result;
689 struct os_time now;
690
691 if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
692 os_get_time(&now) < 0)
693 return NULL;
694 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
695 pac_key, EAP_FAST_PAC_KEY_LEN);
696
697 pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
698 (2 + sm->identity_len) + 8;
699 pac_buf = os_malloc(pac_len);
700 if (pac_buf == NULL)
701 return NULL;
702
703 srv_id_info_len = os_strlen(data->srv_id_info);
704
705 pos = pac_buf;
706 *pos++ = PAC_OPAQUE_TYPE_KEY;
707 *pos++ = EAP_FAST_PAC_KEY_LEN;
708 os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
709 pos += EAP_FAST_PAC_KEY_LEN;
710
711 *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
712 *pos++ = 4;
713 WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
714 pos += 4;
715
716 if (sm->identity) {
717 *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
718 *pos++ = sm->identity_len;
719 os_memcpy(pos, sm->identity, sm->identity_len);
720 pos += sm->identity_len;
721 }
722
723 pac_len = pos - pac_buf;
724 while (pac_len % 8) {
725 *pos++ = PAC_OPAQUE_TYPE_PAD;
726 pac_len++;
727 }
728
729 pac_opaque = os_malloc(pac_len + 8);
730 if (pac_opaque == NULL) {
731 os_free(pac_buf);
732 return NULL;
733 }
734 if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
735 pac_opaque) < 0) {
736 os_free(pac_buf);
737 os_free(pac_opaque);
738 return NULL;
739 }
740 os_free(pac_buf);
741
742 pac_len += 8;
743 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
744 pac_opaque, pac_len);
745
746 buf_len = sizeof(*pac_tlv) +
747 sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
748 sizeof(struct pac_tlv_hdr) + pac_len +
749 data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
750 buf = wpabuf_alloc(buf_len);
751 if (buf == NULL) {
752 os_free(pac_opaque);
753 return NULL;
754 }
755
756 /* Result TLV */
757 wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
758 result = wpabuf_put(buf, sizeof(*result));
759 WPA_PUT_BE16((u8 *) &result->tlv_type,
760 EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
761 WPA_PUT_BE16((u8 *) &result->length, 2);
762 WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
763
764 /* PAC TLV */
765 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
766 pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
767 pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
768 EAP_TLV_PAC_TLV);
769
770 /* PAC-Key */
771 eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
772
773 /* PAC-Opaque */
774 eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
775 os_free(pac_opaque);
776
777 /* PAC-Info */
778 pac_info = wpabuf_put(buf, sizeof(*pac_info));
779 pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
780
781 /* PAC-Lifetime (inside PAC-Info) */
782 eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
783 wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
784
785 /* A-ID (inside PAC-Info) */
786 eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
787
788 /* Note: headers may be misaligned after A-ID */
789
790 if (sm->identity) {
791 eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
792 sm->identity_len);
793 }
794
795 /* A-ID-Info (inside PAC-Info) */
796 eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
797 srv_id_info_len);
798
799 /* PAC-Type (inside PAC-Info) */
800 eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
801 wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
802
803 /* Update PAC-Info and PAC TLV Length fields */
804 pos = wpabuf_put(buf, 0);
805 pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
806 pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
807
808 return buf;
809 }
810
811
eap_fast_encrypt_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * plain,int piggyback)812 static int eap_fast_encrypt_phase2(struct eap_sm *sm,
813 struct eap_fast_data *data,
814 struct wpabuf *plain, int piggyback)
815 {
816 struct wpabuf *encr;
817
818 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
819 plain);
820 encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
821 wpabuf_free(plain);
822
823 if (data->ssl.tls_out && piggyback) {
824 wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
825 "(len=%d) with last Phase 1 Message (len=%d "
826 "used=%d)",
827 (int) wpabuf_len(encr),
828 (int) wpabuf_len(data->ssl.tls_out),
829 (int) data->ssl.tls_out_pos);
830 if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
831 wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
832 "output buffer");
833 wpabuf_free(encr);
834 return -1;
835 }
836 wpabuf_put_buf(data->ssl.tls_out, encr);
837 wpabuf_free(encr);
838 } else {
839 wpabuf_free(data->ssl.tls_out);
840 data->ssl.tls_out_pos = 0;
841 data->ssl.tls_out = encr;
842 }
843
844 return 0;
845 }
846
847
eap_fast_buildReq(struct eap_sm * sm,void * priv,u8 id)848 static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
849 {
850 struct eap_fast_data *data = priv;
851 struct wpabuf *req = NULL;
852 int piggyback = 0;
853
854 if (data->ssl.state == FRAG_ACK) {
855 return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
856 data->fast_version);
857 }
858
859 if (data->ssl.state == WAIT_FRAG_ACK) {
860 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
861 data->fast_version, id);
862 }
863
864 switch (data->state) {
865 case START:
866 return eap_fast_build_start(sm, data, id);
867 case PHASE1:
868 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
869 if (eap_fast_phase1_done(sm, data) < 0)
870 return NULL;
871 if (data->state == PHASE2_START) {
872 /*
873 * Try to generate Phase 2 data to piggyback
874 * with the end of Phase 1 to avoid extra
875 * roundtrip.
876 */
877 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
878 "Phase 2");
879 if (eap_fast_process_phase2_start(sm, data))
880 break;
881 req = eap_fast_build_phase2_req(sm, data, id);
882 piggyback = 1;
883 }
884 }
885 break;
886 case PHASE2_ID:
887 case PHASE2_METHOD:
888 req = eap_fast_build_phase2_req(sm, data, id);
889 break;
890 case CRYPTO_BINDING:
891 req = eap_fast_build_crypto_binding(sm, data);
892 if (data->phase2_method) {
893 /*
894 * Include the start of the next EAP method in the
895 * sequence in the same message with Crypto-Binding to
896 * save a round-trip.
897 */
898 struct wpabuf *eap;
899 eap = eap_fast_build_phase2_req(sm, data, id);
900 req = wpabuf_concat(req, eap);
901 eap_fast_state(data, PHASE2_METHOD);
902 }
903 break;
904 case REQUEST_PAC:
905 req = eap_fast_build_pac(sm, data);
906 break;
907 default:
908 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
909 __func__, data->state);
910 return NULL;
911 }
912
913 if (req &&
914 eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
915 return NULL;
916
917 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
918 data->fast_version, id);
919 }
920
921
eap_fast_check(struct eap_sm * sm,void * priv,struct wpabuf * respData)922 static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
923 struct wpabuf *respData)
924 {
925 const u8 *pos;
926 size_t len;
927
928 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
929 if (pos == NULL || len < 1) {
930 wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
931 return TRUE;
932 }
933
934 return FALSE;
935 }
936
937
eap_fast_phase2_init(struct eap_sm * sm,struct eap_fast_data * data,EapType eap_type)938 static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
939 EapType eap_type)
940 {
941 if (data->phase2_priv && data->phase2_method) {
942 data->phase2_method->reset(sm, data->phase2_priv);
943 data->phase2_method = NULL;
944 data->phase2_priv = NULL;
945 }
946 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
947 eap_type);
948 if (!data->phase2_method)
949 return -1;
950
951 if (data->key_block_p) {
952 sm->auth_challenge = data->key_block_p->server_challenge;
953 sm->peer_challenge = data->key_block_p->client_challenge;
954 }
955 sm->init_phase2 = 1;
956 data->phase2_priv = data->phase2_method->init(sm);
957 sm->init_phase2 = 0;
958 sm->auth_challenge = NULL;
959 sm->peer_challenge = NULL;
960
961 return data->phase2_priv == NULL ? -1 : 0;
962 }
963
964
eap_fast_process_phase2_response(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)965 static void eap_fast_process_phase2_response(struct eap_sm *sm,
966 struct eap_fast_data *data,
967 u8 *in_data, size_t in_len)
968 {
969 u8 next_type = EAP_TYPE_NONE;
970 struct eap_hdr *hdr;
971 u8 *pos;
972 size_t left;
973 struct wpabuf buf;
974 const struct eap_method *m = data->phase2_method;
975 void *priv = data->phase2_priv;
976
977 if (priv == NULL) {
978 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
979 "initialized?!", __func__);
980 return;
981 }
982
983 hdr = (struct eap_hdr *) in_data;
984 pos = (u8 *) (hdr + 1);
985
986 if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
987 left = in_len - sizeof(*hdr);
988 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
989 "allowed types", pos + 1, left - 1);
990 #ifdef EAP_SERVER_TNC
991 if (m && m->vendor == EAP_VENDOR_IETF &&
992 m->method == EAP_TYPE_TNC) {
993 wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
994 "TNC negotiation");
995 next_type = eap_fast_req_failure(sm, data);
996 eap_fast_phase2_init(sm, data, next_type);
997 return;
998 }
999 #endif /* EAP_SERVER_TNC */
1000 eap_sm_process_nak(sm, pos + 1, left - 1);
1001 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1002 sm->user->methods[sm->user_eap_method_index].method !=
1003 EAP_TYPE_NONE) {
1004 next_type = sm->user->methods[
1005 sm->user_eap_method_index++].method;
1006 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1007 next_type);
1008 } else {
1009 next_type = eap_fast_req_failure(sm, data);
1010 }
1011 eap_fast_phase2_init(sm, data, next_type);
1012 return;
1013 }
1014
1015 wpabuf_set(&buf, in_data, in_len);
1016
1017 if (m->check(sm, priv, &buf)) {
1018 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1019 "ignore the packet");
1020 next_type = eap_fast_req_failure(sm, data);
1021 return;
1022 }
1023
1024 m->process(sm, priv, &buf);
1025
1026 if (!m->isDone(sm, priv))
1027 return;
1028
1029 if (!m->isSuccess(sm, priv)) {
1030 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1031 next_type = eap_fast_req_failure(sm, data);
1032 eap_fast_phase2_init(sm, data, next_type);
1033 return;
1034 }
1035
1036 switch (data->state) {
1037 case PHASE2_ID:
1038 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1039 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1040 "Identity not found in the user "
1041 "database",
1042 sm->identity, sm->identity_len);
1043 next_type = eap_fast_req_failure(sm, data);
1044 break;
1045 }
1046
1047 eap_fast_state(data, PHASE2_METHOD);
1048 if (data->anon_provisioning) {
1049 /*
1050 * Only EAP-MSCHAPv2 is allowed for anonymous
1051 * provisioning.
1052 */
1053 next_type = EAP_TYPE_MSCHAPV2;
1054 sm->user_eap_method_index = 0;
1055 } else {
1056 next_type = sm->user->methods[0].method;
1057 sm->user_eap_method_index = 1;
1058 }
1059 wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1060 break;
1061 case PHASE2_METHOD:
1062 case CRYPTO_BINDING:
1063 eap_fast_update_icmk(sm, data);
1064 eap_fast_state(data, CRYPTO_BINDING);
1065 data->eap_seq++;
1066 next_type = EAP_TYPE_NONE;
1067 #ifdef EAP_SERVER_TNC
1068 if (sm->tnc && !data->tnc_started) {
1069 wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1070 next_type = EAP_TYPE_TNC;
1071 data->tnc_started = 1;
1072 }
1073 #endif /* EAP_SERVER_TNC */
1074 break;
1075 case FAILURE:
1076 break;
1077 default:
1078 wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1079 __func__, data->state);
1080 break;
1081 }
1082
1083 eap_fast_phase2_init(sm, data, next_type);
1084 }
1085
1086
eap_fast_process_phase2_eap(struct eap_sm * sm,struct eap_fast_data * data,u8 * in_data,size_t in_len)1087 static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1088 struct eap_fast_data *data,
1089 u8 *in_data, size_t in_len)
1090 {
1091 struct eap_hdr *hdr;
1092 size_t len;
1093
1094 hdr = (struct eap_hdr *) in_data;
1095 if (in_len < (int) sizeof(*hdr)) {
1096 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1097 "EAP frame (len=%lu)", (unsigned long) in_len);
1098 eap_fast_req_failure(sm, data);
1099 return;
1100 }
1101 len = be_to_host16(hdr->length);
1102 if (len > in_len) {
1103 wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1104 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1105 (unsigned long) in_len, (unsigned long) len);
1106 eap_fast_req_failure(sm, data);
1107 return;
1108 }
1109 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1110 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1111 (unsigned long) len);
1112 switch (hdr->code) {
1113 case EAP_CODE_RESPONSE:
1114 eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1115 break;
1116 default:
1117 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1118 "Phase 2 EAP header", hdr->code);
1119 break;
1120 }
1121 }
1122
1123
eap_fast_parse_tlvs(struct wpabuf * data,struct eap_fast_tlv_parse * tlv)1124 static int eap_fast_parse_tlvs(struct wpabuf *data,
1125 struct eap_fast_tlv_parse *tlv)
1126 {
1127 int mandatory, tlv_type, res;
1128 size_t len;
1129 u8 *pos, *end;
1130
1131 os_memset(tlv, 0, sizeof(*tlv));
1132
1133 pos = wpabuf_mhead(data);
1134 end = pos + wpabuf_len(data);
1135 while (pos + 4 < end) {
1136 mandatory = pos[0] & 0x80;
1137 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1138 pos += 2;
1139 len = WPA_GET_BE16(pos);
1140 pos += 2;
1141 if (len > (size_t) (end - pos)) {
1142 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1143 return -1;
1144 }
1145 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1146 "TLV type %d length %u%s",
1147 tlv_type, (unsigned int) len,
1148 mandatory ? " (mandatory)" : "");
1149
1150 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1151 if (res == -2)
1152 break;
1153 if (res < 0) {
1154 if (mandatory) {
1155 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1156 "mandatory TLV type %d", tlv_type);
1157 /* TODO: generate Nak TLV */
1158 break;
1159 } else {
1160 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1161 "unknown optional TLV type %d",
1162 tlv_type);
1163 }
1164 }
1165
1166 pos += len;
1167 }
1168
1169 return 0;
1170 }
1171
1172
eap_fast_validate_crypto_binding(struct eap_fast_data * data,struct eap_tlv_crypto_binding_tlv * b,size_t bind_len)1173 static int eap_fast_validate_crypto_binding(
1174 struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1175 size_t bind_len)
1176 {
1177 u8 cmac[SHA1_MAC_LEN];
1178
1179 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1180 "Version %d Received Version %d SubType %d",
1181 b->version, b->received_version, b->subtype);
1182 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1183 b->nonce, sizeof(b->nonce));
1184 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1185 b->compound_mac, sizeof(b->compound_mac));
1186
1187 if (b->version != EAP_FAST_VERSION ||
1188 b->received_version != EAP_FAST_VERSION) {
1189 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1190 "in Crypto-Binding: version %d "
1191 "received_version %d", b->version,
1192 b->received_version);
1193 return -1;
1194 }
1195
1196 if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1197 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1198 "Crypto-Binding: %d", b->subtype);
1199 return -1;
1200 }
1201
1202 if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1203 (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1204 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1205 "Crypto-Binding");
1206 return -1;
1207 }
1208
1209 os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1210 os_memset(b->compound_mac, 0, sizeof(cmac));
1211 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1212 "Compound MAC calculation",
1213 (u8 *) b, bind_len);
1214 hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1215 b->compound_mac);
1216 if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1217 wpa_hexdump(MSG_MSGDUMP,
1218 "EAP-FAST: Calculated Compound MAC",
1219 b->compound_mac, sizeof(cmac));
1220 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1221 "match");
1222 return -1;
1223 }
1224
1225 return 0;
1226 }
1227
1228
eap_fast_pac_type(u8 * pac,size_t len,u16 type)1229 static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1230 {
1231 struct eap_tlv_pac_type_tlv *tlv;
1232
1233 if (pac == NULL || len != sizeof(*tlv))
1234 return 0;
1235
1236 tlv = (struct eap_tlv_pac_type_tlv *) pac;
1237
1238 return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1239 be_to_host16(tlv->length) == 2 &&
1240 be_to_host16(tlv->pac_type) == type;
1241 }
1242
1243
eap_fast_process_phase2_tlvs(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_data)1244 static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1245 struct eap_fast_data *data,
1246 struct wpabuf *in_data)
1247 {
1248 struct eap_fast_tlv_parse tlv;
1249 int check_crypto_binding = data->state == CRYPTO_BINDING;
1250
1251 if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1252 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1253 "Phase 2 TLVs");
1254 return;
1255 }
1256
1257 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1258 wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1259 "failure");
1260 eap_fast_state(data, FAILURE);
1261 return;
1262 }
1263
1264 if (data->state == REQUEST_PAC) {
1265 u16 type, len, res;
1266 if (tlv.pac == NULL || tlv.pac_len < 6) {
1267 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1268 "Acknowledgement received");
1269 eap_fast_state(data, FAILURE);
1270 return;
1271 }
1272
1273 type = WPA_GET_BE16(tlv.pac);
1274 len = WPA_GET_BE16(tlv.pac + 2);
1275 res = WPA_GET_BE16(tlv.pac + 4);
1276
1277 if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1278 res != EAP_TLV_RESULT_SUCCESS) {
1279 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1280 "contain acknowledgement");
1281 eap_fast_state(data, FAILURE);
1282 return;
1283 }
1284
1285 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1286 "- PAC provisioning succeeded");
1287 eap_fast_state(data, (data->anon_provisioning ||
1288 data->send_new_pac == 2) ?
1289 FAILURE : SUCCESS);
1290 return;
1291 }
1292
1293 if (check_crypto_binding) {
1294 if (tlv.crypto_binding == NULL) {
1295 wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1296 "TLV received");
1297 eap_fast_state(data, FAILURE);
1298 return;
1299 }
1300
1301 if (data->final_result &&
1302 tlv.result != EAP_TLV_RESULT_SUCCESS) {
1303 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1304 "without Success Result");
1305 eap_fast_state(data, FAILURE);
1306 return;
1307 }
1308
1309 if (!data->final_result &&
1310 tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1311 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1312 "without intermediate Success Result");
1313 eap_fast_state(data, FAILURE);
1314 return;
1315 }
1316
1317 if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1318 tlv.crypto_binding_len)) {
1319 eap_fast_state(data, FAILURE);
1320 return;
1321 }
1322
1323 wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1324 "received");
1325 if (data->final_result) {
1326 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1327 "completed successfully");
1328 }
1329
1330 if (data->anon_provisioning &&
1331 sm->eap_fast_prov != ANON_PROV &&
1332 sm->eap_fast_prov != BOTH_PROV) {
1333 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1334 "use unauthenticated provisioning which is "
1335 "disabled");
1336 eap_fast_state(data, FAILURE);
1337 return;
1338 }
1339
1340 if (sm->eap_fast_prov != AUTH_PROV &&
1341 sm->eap_fast_prov != BOTH_PROV &&
1342 tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1343 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1344 PAC_TYPE_TUNNEL_PAC)) {
1345 wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1346 "use authenticated provisioning which is "
1347 "disabled");
1348 eap_fast_state(data, FAILURE);
1349 return;
1350 }
1351
1352 if (data->anon_provisioning ||
1353 (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1354 eap_fast_pac_type(tlv.pac, tlv.pac_len,
1355 PAC_TYPE_TUNNEL_PAC))) {
1356 wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1357 "Tunnel PAC");
1358 eap_fast_state(data, REQUEST_PAC);
1359 } else if (data->send_new_pac) {
1360 wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1361 "re-keying of Tunnel PAC");
1362 eap_fast_state(data, REQUEST_PAC);
1363 } else if (data->final_result)
1364 eap_fast_state(data, SUCCESS);
1365 }
1366
1367 if (tlv.eap_payload_tlv) {
1368 eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1369 tlv.eap_payload_tlv_len);
1370 }
1371 }
1372
1373
eap_fast_process_phase2(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * in_buf)1374 static void eap_fast_process_phase2(struct eap_sm *sm,
1375 struct eap_fast_data *data,
1376 struct wpabuf *in_buf)
1377 {
1378 struct wpabuf *in_decrypted;
1379
1380 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1381 " Phase 2", (unsigned long) wpabuf_len(in_buf));
1382
1383 if (data->pending_phase2_resp) {
1384 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1385 "skip decryption and use old data");
1386 eap_fast_process_phase2_tlvs(sm, data,
1387 data->pending_phase2_resp);
1388 wpabuf_free(data->pending_phase2_resp);
1389 data->pending_phase2_resp = NULL;
1390 return;
1391 }
1392
1393 in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1394 in_buf);
1395 if (in_decrypted == NULL) {
1396 wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1397 "data");
1398 eap_fast_state(data, FAILURE);
1399 return;
1400 }
1401
1402 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1403 in_decrypted);
1404
1405 eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1406
1407 if (sm->method_pending == METHOD_PENDING_WAIT) {
1408 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1409 "pending wait state - save decrypted response");
1410 wpabuf_free(data->pending_phase2_resp);
1411 data->pending_phase2_resp = in_decrypted;
1412 return;
1413 }
1414
1415 wpabuf_free(in_decrypted);
1416 }
1417
1418
eap_fast_process_version(struct eap_sm * sm,void * priv,int peer_version)1419 static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1420 int peer_version)
1421 {
1422 struct eap_fast_data *data = priv;
1423
1424 data->peer_version = peer_version;
1425
1426 if (data->force_version >= 0 && peer_version != data->force_version) {
1427 wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1428 " version (forced=%d peer=%d) - reject",
1429 data->force_version, peer_version);
1430 return -1;
1431 }
1432
1433 if (peer_version < data->fast_version) {
1434 wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1435 "use version %d",
1436 peer_version, data->fast_version, peer_version);
1437 data->fast_version = peer_version;
1438 }
1439
1440 return 0;
1441 }
1442
1443
eap_fast_process_phase1(struct eap_sm * sm,struct eap_fast_data * data)1444 static int eap_fast_process_phase1(struct eap_sm *sm,
1445 struct eap_fast_data *data)
1446 {
1447 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1448 wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1449 eap_fast_state(data, FAILURE);
1450 return -1;
1451 }
1452
1453 if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1454 wpabuf_len(data->ssl.tls_out) > 0)
1455 return 1;
1456
1457 /*
1458 * Phase 1 was completed with the received message (e.g., when using
1459 * abbreviated handshake), so Phase 2 can be started immediately
1460 * without having to send through an empty message to the peer.
1461 */
1462
1463 return eap_fast_phase1_done(sm, data);
1464 }
1465
1466
eap_fast_process_phase2_start(struct eap_sm * sm,struct eap_fast_data * data)1467 static int eap_fast_process_phase2_start(struct eap_sm *sm,
1468 struct eap_fast_data *data)
1469 {
1470 u8 next_type;
1471
1472 if (data->identity) {
1473 os_free(sm->identity);
1474 sm->identity = data->identity;
1475 data->identity = NULL;
1476 sm->identity_len = data->identity_len;
1477 data->identity_len = 0;
1478 sm->require_identity_match = 1;
1479 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1480 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1481 "Phase2 Identity not found "
1482 "in the user database",
1483 sm->identity, sm->identity_len);
1484 next_type = eap_fast_req_failure(sm, data);
1485 } else {
1486 wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1487 "known - skip Phase 2 Identity Request");
1488 next_type = sm->user->methods[0].method;
1489 sm->user_eap_method_index = 1;
1490 }
1491
1492 eap_fast_state(data, PHASE2_METHOD);
1493 } else {
1494 eap_fast_state(data, PHASE2_ID);
1495 next_type = EAP_TYPE_IDENTITY;
1496 }
1497
1498 return eap_fast_phase2_init(sm, data, next_type);
1499 }
1500
1501
eap_fast_process_msg(struct eap_sm * sm,void * priv,const struct wpabuf * respData)1502 static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1503 const struct wpabuf *respData)
1504 {
1505 struct eap_fast_data *data = priv;
1506
1507 switch (data->state) {
1508 case PHASE1:
1509 if (eap_fast_process_phase1(sm, data))
1510 break;
1511
1512 /* fall through to PHASE2_START */
1513 case PHASE2_START:
1514 eap_fast_process_phase2_start(sm, data);
1515 break;
1516 case PHASE2_ID:
1517 case PHASE2_METHOD:
1518 case CRYPTO_BINDING:
1519 case REQUEST_PAC:
1520 eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1521 break;
1522 default:
1523 wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1524 data->state, __func__);
1525 break;
1526 }
1527 }
1528
1529
eap_fast_process(struct eap_sm * sm,void * priv,struct wpabuf * respData)1530 static void eap_fast_process(struct eap_sm *sm, void *priv,
1531 struct wpabuf *respData)
1532 {
1533 struct eap_fast_data *data = priv;
1534 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1535 EAP_TYPE_FAST, eap_fast_process_version,
1536 eap_fast_process_msg) < 0)
1537 eap_fast_state(data, FAILURE);
1538 }
1539
1540
eap_fast_isDone(struct eap_sm * sm,void * priv)1541 static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1542 {
1543 struct eap_fast_data *data = priv;
1544 return data->state == SUCCESS || data->state == FAILURE;
1545 }
1546
1547
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1548 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1549 {
1550 struct eap_fast_data *data = priv;
1551 u8 *eapKeyData;
1552
1553 if (data->state != SUCCESS)
1554 return NULL;
1555
1556 eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1557 if (eapKeyData == NULL)
1558 return NULL;
1559
1560 eap_fast_derive_eap_msk(data->simck, eapKeyData);
1561 *len = EAP_FAST_KEY_LEN;
1562
1563 return eapKeyData;
1564 }
1565
1566
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1567 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1568 {
1569 struct eap_fast_data *data = priv;
1570 u8 *eapKeyData;
1571
1572 if (data->state != SUCCESS)
1573 return NULL;
1574
1575 eapKeyData = os_malloc(EAP_EMSK_LEN);
1576 if (eapKeyData == NULL)
1577 return NULL;
1578
1579 eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1580 *len = EAP_EMSK_LEN;
1581
1582 return eapKeyData;
1583 }
1584
1585
eap_fast_isSuccess(struct eap_sm * sm,void * priv)1586 static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1587 {
1588 struct eap_fast_data *data = priv;
1589 return data->state == SUCCESS;
1590 }
1591
1592
eap_server_fast_register(void)1593 int eap_server_fast_register(void)
1594 {
1595 struct eap_method *eap;
1596 int ret;
1597
1598 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1599 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1600 if (eap == NULL)
1601 return -1;
1602
1603 eap->init = eap_fast_init;
1604 eap->reset = eap_fast_reset;
1605 eap->buildReq = eap_fast_buildReq;
1606 eap->check = eap_fast_check;
1607 eap->process = eap_fast_process;
1608 eap->isDone = eap_fast_isDone;
1609 eap->getKey = eap_fast_getKey;
1610 eap->get_emsk = eap_fast_get_emsk;
1611 eap->isSuccess = eap_fast_isSuccess;
1612
1613 ret = eap_server_method_register(eap);
1614 if (ret)
1615 eap_server_method_free(eap);
1616 return ret;
1617 }
1618