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Skip network disabling on expected EAP failure
[thirdparty/hostap.git] / src / eap_peer / eap_fast.c
1 /*
2 * EAP peer method: EAP-FAST (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/tls.h"
13 #include "crypto/sha1.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_i.h"
16 #include "eap_tls_common.h"
17 #include "eap_config.h"
18 #include "eap_fast_pac.h"
19
20 #ifdef EAP_FAST_DYNAMIC
21 #include "eap_fast_pac.c"
22 #endif /* EAP_FAST_DYNAMIC */
23
24 /* TODO:
25 * - test session resumption and enable it if it interoperates
26 * - password change (pending mschapv2 packet; replay decrypted packet)
27 */
28
29
30 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
31
32
33 struct eap_fast_data {
34 struct eap_ssl_data ssl;
35
36 int fast_version;
37
38 const struct eap_method *phase2_method;
39 void *phase2_priv;
40 int phase2_success;
41
42 struct eap_method_type phase2_type;
43 struct eap_method_type *phase2_types;
44 size_t num_phase2_types;
45 int resuming; /* starting a resumed session */
46 struct eap_fast_key_block_provisioning *key_block_p;
47 #define EAP_FAST_PROV_UNAUTH 1
48 #define EAP_FAST_PROV_AUTH 2
49 int provisioning_allowed; /* Allowed PAC provisioning modes */
50 int provisioning; /* doing PAC provisioning (not the normal auth) */
51 int anon_provisioning; /* doing anonymous (unauthenticated)
52 * provisioning */
53 int session_ticket_used;
54
55 u8 key_data[EAP_FAST_KEY_LEN];
56 u8 *session_id;
57 size_t id_len;
58 u8 emsk[EAP_EMSK_LEN];
59 int success;
60
61 struct eap_fast_pac *pac;
62 struct eap_fast_pac *current_pac;
63 size_t max_pac_list_len;
64 int use_pac_binary_format;
65
66 u8 simck[EAP_FAST_SIMCK_LEN];
67 int simck_idx;
68
69 struct wpabuf *pending_phase2_req;
70 };
71
72
73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
74 const u8 *client_random,
75 const u8 *server_random,
76 u8 *master_secret)
77 {
78 struct eap_fast_data *data = ctx;
79
80 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
81
82 if (client_random == NULL || server_random == NULL ||
83 master_secret == NULL) {
84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
85 "back to full TLS handshake");
86 data->session_ticket_used = 0;
87 if (data->provisioning_allowed) {
88 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
89 "new PAC-Key");
90 data->provisioning = 1;
91 data->current_pac = NULL;
92 }
93 return 0;
94 }
95
96 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
97
98 if (data->current_pac == NULL) {
99 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
100 "using SessionTicket");
101 data->session_ticket_used = 0;
102 return 0;
103 }
104
105 eap_fast_derive_master_secret(data->current_pac->pac_key,
106 server_random, client_random,
107 master_secret);
108
109 data->session_ticket_used = 1;
110
111 return 1;
112 }
113
114
115 static int eap_fast_parse_phase1(struct eap_fast_data *data,
116 const char *phase1)
117 {
118 const char *pos;
119
120 pos = os_strstr(phase1, "fast_provisioning=");
121 if (pos) {
122 data->provisioning_allowed = atoi(pos + 18);
123 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
124 "mode: %d", data->provisioning_allowed);
125 }
126
127 pos = os_strstr(phase1, "fast_max_pac_list_len=");
128 if (pos) {
129 data->max_pac_list_len = atoi(pos + 22);
130 if (data->max_pac_list_len == 0)
131 data->max_pac_list_len = 1;
132 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
133 (unsigned long) data->max_pac_list_len);
134 }
135
136 pos = os_strstr(phase1, "fast_pac_format=binary");
137 if (pos) {
138 data->use_pac_binary_format = 1;
139 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
140 "list");
141 }
142
143 return 0;
144 }
145
146
147 static void * eap_fast_init(struct eap_sm *sm)
148 {
149 struct eap_fast_data *data;
150 struct eap_peer_config *config = eap_get_config(sm);
151
152 data = os_zalloc(sizeof(*data));
153 if (data == NULL)
154 return NULL;
155 data->fast_version = EAP_FAST_VERSION;
156 data->max_pac_list_len = 10;
157
158 if (config && config->phase1 &&
159 eap_fast_parse_phase1(data, config->phase1) < 0) {
160 eap_fast_deinit(sm, data);
161 return NULL;
162 }
163
164 if (eap_peer_select_phase2_methods(config, "auth=",
165 &data->phase2_types,
166 &data->num_phase2_types) < 0) {
167 eap_fast_deinit(sm, data);
168 return NULL;
169 }
170
171 data->phase2_type.vendor = EAP_VENDOR_IETF;
172 data->phase2_type.method = EAP_TYPE_NONE;
173
174 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
175 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
176 eap_fast_deinit(sm, data);
177 return NULL;
178 }
179
180 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
181 eap_fast_session_ticket_cb,
182 data) < 0) {
183 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
184 "callback");
185 eap_fast_deinit(sm, data);
186 return NULL;
187 }
188
189 /*
190 * The local RADIUS server in a Cisco AP does not seem to like empty
191 * fragments before data, so disable that workaround for CBC.
192 * TODO: consider making this configurable
193 */
194 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
195 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
196 "workarounds");
197 }
198
199 if (!config->pac_file) {
200 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
201 eap_fast_deinit(sm, data);
202 return NULL;
203 }
204
205 if (data->use_pac_binary_format &&
206 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
207 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
208 eap_fast_deinit(sm, data);
209 return NULL;
210 }
211
212 if (!data->use_pac_binary_format &&
213 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
214 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
215 eap_fast_deinit(sm, data);
216 return NULL;
217 }
218 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
219
220 if (data->pac == NULL && !data->provisioning_allowed) {
221 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
222 "provisioning disabled");
223 eap_fast_deinit(sm, data);
224 return NULL;
225 }
226
227 return data;
228 }
229
230
231 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
232 {
233 struct eap_fast_data *data = priv;
234 struct eap_fast_pac *pac, *prev;
235
236 if (data == NULL)
237 return;
238 if (data->phase2_priv && data->phase2_method)
239 data->phase2_method->deinit(sm, data->phase2_priv);
240 os_free(data->phase2_types);
241 os_free(data->key_block_p);
242 eap_peer_tls_ssl_deinit(sm, &data->ssl);
243
244 pac = data->pac;
245 prev = NULL;
246 while (pac) {
247 prev = pac;
248 pac = pac->next;
249 eap_fast_free_pac(prev);
250 }
251 os_free(data->session_id);
252 wpabuf_free(data->pending_phase2_req);
253 os_free(data);
254 }
255
256
257 static int eap_fast_derive_msk(struct eap_fast_data *data)
258 {
259 eap_fast_derive_eap_msk(data->simck, data->key_data);
260 eap_fast_derive_eap_emsk(data->simck, data->emsk);
261 data->success = 1;
262 return 0;
263 }
264
265
266 static void eap_fast_derive_key_auth(struct eap_sm *sm,
267 struct eap_fast_data *data)
268 {
269 u8 *sks;
270
271 /* RFC 4851, Section 5.1:
272 * Extra key material after TLS key_block: session_key_seed[40]
273 */
274
275 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
276 EAP_FAST_SKS_LEN);
277 if (sks == NULL) {
278 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
279 "session_key_seed");
280 return;
281 }
282
283 /*
284 * RFC 4851, Section 5.2:
285 * S-IMCK[0] = session_key_seed
286 */
287 wpa_hexdump_key(MSG_DEBUG,
288 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
289 sks, EAP_FAST_SKS_LEN);
290 data->simck_idx = 0;
291 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
292 os_free(sks);
293 }
294
295
296 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
297 struct eap_fast_data *data)
298 {
299 os_free(data->key_block_p);
300 data->key_block_p = (struct eap_fast_key_block_provisioning *)
301 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
302 "key expansion",
303 sizeof(*data->key_block_p));
304 if (data->key_block_p == NULL) {
305 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
306 return;
307 }
308 /*
309 * RFC 4851, Section 5.2:
310 * S-IMCK[0] = session_key_seed
311 */
312 wpa_hexdump_key(MSG_DEBUG,
313 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
314 data->key_block_p->session_key_seed,
315 sizeof(data->key_block_p->session_key_seed));
316 data->simck_idx = 0;
317 os_memcpy(data->simck, data->key_block_p->session_key_seed,
318 EAP_FAST_SIMCK_LEN);
319 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
320 data->key_block_p->server_challenge,
321 sizeof(data->key_block_p->server_challenge));
322 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
323 data->key_block_p->client_challenge,
324 sizeof(data->key_block_p->client_challenge));
325 }
326
327
328 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
329 {
330 if (data->anon_provisioning)
331 eap_fast_derive_key_provisioning(sm, data);
332 else
333 eap_fast_derive_key_auth(sm, data);
334 }
335
336
337 static int eap_fast_init_phase2_method(struct eap_sm *sm,
338 struct eap_fast_data *data)
339 {
340 data->phase2_method =
341 eap_peer_get_eap_method(data->phase2_type.vendor,
342 data->phase2_type.method);
343 if (data->phase2_method == NULL)
344 return -1;
345
346 if (data->key_block_p) {
347 sm->auth_challenge = data->key_block_p->server_challenge;
348 sm->peer_challenge = data->key_block_p->client_challenge;
349 }
350 sm->init_phase2 = 1;
351 data->phase2_priv = data->phase2_method->init(sm);
352 sm->init_phase2 = 0;
353 sm->auth_challenge = NULL;
354 sm->peer_challenge = NULL;
355
356 return data->phase2_priv == NULL ? -1 : 0;
357 }
358
359
360 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
361 {
362 size_t i;
363
364 /* TODO: TNC with anonymous provisioning; need to require both
365 * completed MSCHAPv2 and TNC */
366
367 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
368 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
369 "during unauthenticated provisioning; reject phase2"
370 " type %d", type);
371 return -1;
372 }
373
374 #ifdef EAP_TNC
375 if (type == EAP_TYPE_TNC) {
376 data->phase2_type.vendor = EAP_VENDOR_IETF;
377 data->phase2_type.method = EAP_TYPE_TNC;
378 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
379 "vendor %d method %d for TNC",
380 data->phase2_type.vendor,
381 data->phase2_type.method);
382 return 0;
383 }
384 #endif /* EAP_TNC */
385
386 for (i = 0; i < data->num_phase2_types; i++) {
387 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
388 data->phase2_types[i].method != type)
389 continue;
390
391 data->phase2_type.vendor = data->phase2_types[i].vendor;
392 data->phase2_type.method = data->phase2_types[i].method;
393 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
394 "vendor %d method %d",
395 data->phase2_type.vendor,
396 data->phase2_type.method);
397 break;
398 }
399
400 if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
401 return -1;
402
403 return 0;
404 }
405
406
407 static int eap_fast_phase2_request(struct eap_sm *sm,
408 struct eap_fast_data *data,
409 struct eap_method_ret *ret,
410 struct eap_hdr *hdr,
411 struct wpabuf **resp)
412 {
413 size_t len = be_to_host16(hdr->length);
414 u8 *pos;
415 struct eap_method_ret iret;
416 struct eap_peer_config *config = eap_get_config(sm);
417 struct wpabuf msg;
418
419 if (len <= sizeof(struct eap_hdr)) {
420 wpa_printf(MSG_INFO, "EAP-FAST: too short "
421 "Phase 2 request (len=%lu)", (unsigned long) len);
422 return -1;
423 }
424 pos = (u8 *) (hdr + 1);
425 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
426 if (*pos == EAP_TYPE_IDENTITY) {
427 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
428 return 0;
429 }
430
431 if (data->phase2_priv && data->phase2_method &&
432 *pos != data->phase2_type.method) {
433 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
434 "deinitialize previous method");
435 data->phase2_method->deinit(sm, data->phase2_priv);
436 data->phase2_method = NULL;
437 data->phase2_priv = NULL;
438 data->phase2_type.vendor = EAP_VENDOR_IETF;
439 data->phase2_type.method = EAP_TYPE_NONE;
440 }
441
442 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
443 data->phase2_type.method == EAP_TYPE_NONE &&
444 eap_fast_select_phase2_method(data, *pos) < 0) {
445 if (eap_peer_tls_phase2_nak(data->phase2_types,
446 data->num_phase2_types,
447 hdr, resp))
448 return -1;
449 return 0;
450 }
451
452 if ((data->phase2_priv == NULL &&
453 eap_fast_init_phase2_method(sm, data) < 0) ||
454 data->phase2_method == NULL) {
455 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
456 "Phase 2 EAP method %d", *pos);
457 ret->methodState = METHOD_DONE;
458 ret->decision = DECISION_FAIL;
459 return -1;
460 }
461
462 os_memset(&iret, 0, sizeof(iret));
463 wpabuf_set(&msg, hdr, len);
464 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
465 &msg);
466 if (*resp == NULL ||
467 (iret.methodState == METHOD_DONE &&
468 iret.decision == DECISION_FAIL)) {
469 ret->methodState = METHOD_DONE;
470 ret->decision = DECISION_FAIL;
471 } else if ((iret.methodState == METHOD_DONE ||
472 iret.methodState == METHOD_MAY_CONT) &&
473 (iret.decision == DECISION_UNCOND_SUCC ||
474 iret.decision == DECISION_COND_SUCC)) {
475 data->phase2_success = 1;
476 }
477
478 if (*resp == NULL && config &&
479 (config->pending_req_identity || config->pending_req_password ||
480 config->pending_req_otp || config->pending_req_new_password)) {
481 wpabuf_free(data->pending_phase2_req);
482 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
483 } else if (*resp == NULL)
484 return -1;
485
486 return 0;
487 }
488
489
490 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
491 {
492 struct wpabuf *buf;
493 struct eap_tlv_nak_tlv *nak;
494 buf = wpabuf_alloc(sizeof(*nak));
495 if (buf == NULL)
496 return NULL;
497 nak = wpabuf_put(buf, sizeof(*nak));
498 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
499 nak->length = host_to_be16(6);
500 nak->vendor_id = host_to_be32(vendor_id);
501 nak->nak_type = host_to_be16(tlv_type);
502 return buf;
503 }
504
505
506 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
507 {
508 struct wpabuf *buf;
509 struct eap_tlv_intermediate_result_tlv *result;
510 buf = wpabuf_alloc(sizeof(*result));
511 if (buf == NULL)
512 return NULL;
513 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
514 intermediate ? "Intermediate " : "", status);
515 result = wpabuf_put(buf, sizeof(*result));
516 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
517 (intermediate ?
518 EAP_TLV_INTERMEDIATE_RESULT_TLV :
519 EAP_TLV_RESULT_TLV));
520 result->length = host_to_be16(2);
521 result->status = host_to_be16(status);
522 return buf;
523 }
524
525
526 static struct wpabuf * eap_fast_tlv_pac_ack(void)
527 {
528 struct wpabuf *buf;
529 struct eap_tlv_result_tlv *res;
530 struct eap_tlv_pac_ack_tlv *ack;
531
532 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
533 if (buf == NULL)
534 return NULL;
535
536 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
537 ack = wpabuf_put(buf, sizeof(*ack));
538 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
539 EAP_TLV_TYPE_MANDATORY);
540 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
541 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
542 ack->pac_len = host_to_be16(2);
543 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
544
545 return buf;
546 }
547
548
549 static struct wpabuf * eap_fast_process_eap_payload_tlv(
550 struct eap_sm *sm, struct eap_fast_data *data,
551 struct eap_method_ret *ret,
552 u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
553 {
554 struct eap_hdr *hdr;
555 struct wpabuf *resp = NULL;
556
557 if (eap_payload_tlv_len < sizeof(*hdr)) {
558 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
559 "Payload TLV (len=%lu)",
560 (unsigned long) eap_payload_tlv_len);
561 return NULL;
562 }
563
564 hdr = (struct eap_hdr *) eap_payload_tlv;
565 if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
566 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
567 "EAP Payload TLV");
568 return NULL;
569 }
570
571 if (hdr->code != EAP_CODE_REQUEST) {
572 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
573 "Phase 2 EAP header", hdr->code);
574 return NULL;
575 }
576
577 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
578 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
579 "failed");
580 return NULL;
581 }
582
583 return eap_fast_tlv_eap_payload(resp);
584 }
585
586
587 static int eap_fast_validate_crypto_binding(
588 struct eap_tlv_crypto_binding_tlv *_bind)
589 {
590 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
591 "Received Version %d SubType %d",
592 _bind->version, _bind->received_version, _bind->subtype);
593 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
594 _bind->nonce, sizeof(_bind->nonce));
595 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
596 _bind->compound_mac, sizeof(_bind->compound_mac));
597
598 if (_bind->version != EAP_FAST_VERSION ||
599 _bind->received_version != EAP_FAST_VERSION ||
600 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
601 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
602 "Crypto-Binding TLV: Version %d "
603 "Received Version %d SubType %d",
604 _bind->version, _bind->received_version,
605 _bind->subtype);
606 return -1;
607 }
608
609 return 0;
610 }
611
612
613 static void eap_fast_write_crypto_binding(
614 struct eap_tlv_crypto_binding_tlv *rbind,
615 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
616 {
617 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
618 EAP_TLV_CRYPTO_BINDING_TLV);
619 rbind->length = host_to_be16(sizeof(*rbind) -
620 sizeof(struct eap_tlv_hdr));
621 rbind->version = EAP_FAST_VERSION;
622 rbind->received_version = _bind->version;
623 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
624 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
625 inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
626 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
627 rbind->compound_mac);
628
629 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
630 "Received Version %d SubType %d",
631 rbind->version, rbind->received_version, rbind->subtype);
632 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
633 rbind->nonce, sizeof(rbind->nonce));
634 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
635 rbind->compound_mac, sizeof(rbind->compound_mac));
636 }
637
638
639 static int eap_fast_get_phase2_key(struct eap_sm *sm,
640 struct eap_fast_data *data,
641 u8 *isk, size_t isk_len)
642 {
643 u8 *key;
644 size_t key_len;
645
646 os_memset(isk, 0, isk_len);
647
648 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
649 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
650 "available");
651 return -1;
652 }
653
654 if (data->phase2_method->isKeyAvailable == NULL ||
655 data->phase2_method->getKey == NULL)
656 return 0;
657
658 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
659 (key = data->phase2_method->getKey(sm, data->phase2_priv,
660 &key_len)) == NULL) {
661 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
662 "from Phase 2");
663 return -1;
664 }
665
666 if (key_len > isk_len)
667 key_len = isk_len;
668 if (key_len == 32 &&
669 data->phase2_method->vendor == EAP_VENDOR_IETF &&
670 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
671 /*
672 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
673 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
674 * ISK for EAP-FAST cryptobinding.
675 */
676 os_memcpy(isk, key + 16, 16);
677 os_memcpy(isk + 16, key, 16);
678 } else
679 os_memcpy(isk, key, key_len);
680 os_free(key);
681
682 return 0;
683 }
684
685
686 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
687 u8 *cmk)
688 {
689 u8 isk[32], imck[60];
690
691 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
692 "calculation", data->simck_idx + 1);
693
694 /*
695 * RFC 4851, Section 5.2:
696 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
697 * MSK[j], 60)
698 * S-IMCK[j] = first 40 octets of IMCK[j]
699 * CMK[j] = last 20 octets of IMCK[j]
700 */
701
702 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
703 return -1;
704 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
705 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
706 "Inner Methods Compound Keys",
707 isk, sizeof(isk), imck, sizeof(imck));
708 data->simck_idx++;
709 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
710 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
711 data->simck, EAP_FAST_SIMCK_LEN);
712 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
713 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
714 cmk, EAP_FAST_CMK_LEN);
715
716 return 0;
717 }
718
719
720 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
721 {
722 struct eap_tlv_hdr *pac;
723 struct eap_tlv_request_action_tlv *act;
724 struct eap_tlv_pac_type_tlv *type;
725
726 act = (struct eap_tlv_request_action_tlv *) pos;
727 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
728 act->length = host_to_be16(2);
729 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
730
731 pac = (struct eap_tlv_hdr *) (act + 1);
732 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
733 pac->length = host_to_be16(sizeof(*type));
734
735 type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
736 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
737 type->length = host_to_be16(2);
738 type->pac_type = host_to_be16(pac_type);
739
740 return (u8 *) (type + 1);
741 }
742
743
744 static struct wpabuf * eap_fast_process_crypto_binding(
745 struct eap_sm *sm, struct eap_fast_data *data,
746 struct eap_method_ret *ret,
747 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
748 {
749 struct wpabuf *resp;
750 u8 *pos;
751 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
752 int res;
753 size_t len;
754
755 if (eap_fast_validate_crypto_binding(_bind) < 0)
756 return NULL;
757
758 if (eap_fast_get_cmk(sm, data, cmk) < 0)
759 return NULL;
760
761 /* Validate received Compound MAC */
762 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
763 os_memset(_bind->compound_mac, 0, sizeof(cmac));
764 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
765 "MAC calculation", (u8 *) _bind, bind_len);
766 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
767 _bind->compound_mac);
768 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
769 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
770 cmac, sizeof(cmac));
771 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
772 _bind->compound_mac, sizeof(cmac));
773 if (res != 0) {
774 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
775 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
776 return NULL;
777 }
778
779 /*
780 * Compound MAC was valid, so authentication succeeded. Reply with
781 * crypto binding to allow server to complete authentication.
782 */
783
784 len = sizeof(struct eap_tlv_crypto_binding_tlv);
785 resp = wpabuf_alloc(len);
786 if (resp == NULL)
787 return NULL;
788
789 if (!data->anon_provisioning && data->phase2_success &&
790 eap_fast_derive_msk(data) < 0) {
791 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
792 ret->methodState = METHOD_DONE;
793 ret->decision = DECISION_FAIL;
794 data->phase2_success = 0;
795 wpabuf_free(resp);
796 return NULL;
797 }
798
799 if (!data->anon_provisioning && data->phase2_success) {
800 os_free(data->session_id);
801 data->session_id = eap_peer_tls_derive_session_id(
802 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
803 if (data->session_id) {
804 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
805 data->session_id, data->id_len);
806 } else {
807 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
808 "Session-Id");
809 wpabuf_free(resp);
810 return NULL;
811 }
812 }
813
814 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
815 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
816 pos, _bind, cmk);
817
818 return resp;
819 }
820
821
822 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
823 u8 *pos, size_t len, int *pac_key_found)
824 {
825 switch (type & 0x7fff) {
826 case PAC_TYPE_PAC_KEY:
827 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
828 if (len != EAP_FAST_PAC_KEY_LEN) {
829 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
830 "length %lu", (unsigned long) len);
831 break;
832 }
833 *pac_key_found = 1;
834 os_memcpy(entry->pac_key, pos, len);
835 break;
836 case PAC_TYPE_PAC_OPAQUE:
837 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
838 entry->pac_opaque = pos;
839 entry->pac_opaque_len = len;
840 break;
841 case PAC_TYPE_PAC_INFO:
842 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
843 entry->pac_info = pos;
844 entry->pac_info_len = len;
845 break;
846 default:
847 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
848 type);
849 break;
850 }
851 }
852
853
854 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
855 u8 *pac, size_t pac_len)
856 {
857 struct pac_tlv_hdr *hdr;
858 u8 *pos;
859 size_t left, len;
860 int type, pac_key_found = 0;
861
862 pos = pac;
863 left = pac_len;
864
865 while (left > sizeof(*hdr)) {
866 hdr = (struct pac_tlv_hdr *) pos;
867 type = be_to_host16(hdr->type);
868 len = be_to_host16(hdr->len);
869 pos += sizeof(*hdr);
870 left -= sizeof(*hdr);
871 if (len > left) {
872 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
873 "(type=%d len=%lu left=%lu)",
874 type, (unsigned long) len,
875 (unsigned long) left);
876 return -1;
877 }
878
879 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
880
881 pos += len;
882 left -= len;
883 }
884
885 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
886 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
887 "all the required fields");
888 return -1;
889 }
890
891 return 0;
892 }
893
894
895 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
896 u8 *pos, size_t len)
897 {
898 u16 pac_type;
899 u32 lifetime;
900 struct os_time now;
901
902 switch (type & 0x7fff) {
903 case PAC_TYPE_CRED_LIFETIME:
904 if (len != 4) {
905 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
906 "Invalid CRED_LIFETIME length - ignored",
907 pos, len);
908 return 0;
909 }
910
911 /*
912 * This is not currently saved separately in PAC files since
913 * the server can automatically initiate PAC update when
914 * needed. Anyway, the information is available from PAC-Info
915 * dump if it is needed for something in the future.
916 */
917 lifetime = WPA_GET_BE32(pos);
918 os_get_time(&now);
919 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
920 "(%d days)",
921 lifetime, (lifetime - (u32) now.sec) / 86400);
922 break;
923 case PAC_TYPE_A_ID:
924 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
925 pos, len);
926 entry->a_id = pos;
927 entry->a_id_len = len;
928 break;
929 case PAC_TYPE_I_ID:
930 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
931 pos, len);
932 entry->i_id = pos;
933 entry->i_id_len = len;
934 break;
935 case PAC_TYPE_A_ID_INFO:
936 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
937 pos, len);
938 entry->a_id_info = pos;
939 entry->a_id_info_len = len;
940 break;
941 case PAC_TYPE_PAC_TYPE:
942 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
943 if (len != 2) {
944 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
945 "length %lu (expected 2)",
946 (unsigned long) len);
947 wpa_hexdump_ascii(MSG_DEBUG,
948 "EAP-FAST: PAC-Info - PAC-Type",
949 pos, len);
950 return -1;
951 }
952 pac_type = WPA_GET_BE16(pos);
953 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
954 pac_type != PAC_TYPE_USER_AUTHORIZATION &&
955 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
956 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
957 "%d", pac_type);
958 return -1;
959 }
960
961 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
962 pac_type);
963 entry->pac_type = pac_type;
964 break;
965 default:
966 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
967 "type %d", type);
968 break;
969 }
970
971 return 0;
972 }
973
974
975 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
976 {
977 struct pac_tlv_hdr *hdr;
978 u8 *pos;
979 size_t left, len;
980 int type;
981
982 /* RFC 5422, Section 4.2.4 */
983
984 /* PAC-Type defaults to Tunnel PAC (Type 1) */
985 entry->pac_type = PAC_TYPE_TUNNEL_PAC;
986
987 pos = entry->pac_info;
988 left = entry->pac_info_len;
989 while (left > sizeof(*hdr)) {
990 hdr = (struct pac_tlv_hdr *) pos;
991 type = be_to_host16(hdr->type);
992 len = be_to_host16(hdr->len);
993 pos += sizeof(*hdr);
994 left -= sizeof(*hdr);
995 if (len > left) {
996 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
997 "(type=%d len=%lu left=%lu)",
998 type, (unsigned long) len,
999 (unsigned long) left);
1000 return -1;
1001 }
1002
1003 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
1004 return -1;
1005
1006 pos += len;
1007 left -= len;
1008 }
1009
1010 if (entry->a_id == NULL || entry->a_id_info == NULL) {
1011 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1012 "all the required fields");
1013 return -1;
1014 }
1015
1016 return 0;
1017 }
1018
1019
1020 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1021 struct eap_fast_data *data,
1022 struct eap_method_ret *ret,
1023 u8 *pac, size_t pac_len)
1024 {
1025 struct eap_peer_config *config = eap_get_config(sm);
1026 struct eap_fast_pac entry;
1027
1028 os_memset(&entry, 0, sizeof(entry));
1029 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1030 eap_fast_process_pac_info(&entry))
1031 return NULL;
1032
1033 eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1034 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1035 if (data->use_pac_binary_format)
1036 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1037 else
1038 eap_fast_save_pac(sm, data->pac, config->pac_file);
1039
1040 if (data->provisioning) {
1041 if (data->anon_provisioning) {
1042 /*
1043 * Unauthenticated provisioning does not provide keying
1044 * material and must end with an EAP-Failure.
1045 * Authentication will be done separately after this.
1046 */
1047 data->success = 0;
1048 ret->decision = DECISION_FAIL;
1049 } else {
1050 /*
1051 * Server may or may not allow authenticated
1052 * provisioning also for key generation.
1053 */
1054 ret->decision = DECISION_COND_SUCC;
1055 }
1056 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1057 "- Provisioning completed successfully");
1058 sm->expected_failure = 1;
1059 } else {
1060 /*
1061 * This is PAC refreshing, i.e., normal authentication that is
1062 * expected to be completed with an EAP-Success. However,
1063 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1064 * after protected success exchange in case of EAP-Fast
1065 * provisioning, so we better use DECISION_COND_SUCC here
1066 * instead of DECISION_UNCOND_SUCC.
1067 */
1068 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1069 "- PAC refreshing completed successfully");
1070 ret->decision = DECISION_COND_SUCC;
1071 }
1072 ret->methodState = METHOD_DONE;
1073 return eap_fast_tlv_pac_ack();
1074 }
1075
1076
1077 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1078 struct eap_fast_tlv_parse *tlv,
1079 struct wpabuf **resp)
1080 {
1081 int mandatory, tlv_type, len, res;
1082 u8 *pos, *end;
1083
1084 os_memset(tlv, 0, sizeof(*tlv));
1085
1086 /* Parse TLVs from the decrypted Phase 2 data */
1087 pos = wpabuf_mhead(decrypted);
1088 end = pos + wpabuf_len(decrypted);
1089 while (pos + 4 < end) {
1090 mandatory = pos[0] & 0x80;
1091 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1092 pos += 2;
1093 len = WPA_GET_BE16(pos);
1094 pos += 2;
1095 if (pos + len > end) {
1096 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1097 return -1;
1098 }
1099 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1100 "TLV type %d length %d%s",
1101 tlv_type, len, mandatory ? " (mandatory)" : "");
1102
1103 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1104 if (res == -2)
1105 break;
1106 if (res < 0) {
1107 if (mandatory) {
1108 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1109 "mandatory TLV type %d", tlv_type);
1110 *resp = eap_fast_tlv_nak(0, tlv_type);
1111 break;
1112 } else {
1113 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1114 "unknown optional TLV type %d",
1115 tlv_type);
1116 }
1117 }
1118
1119 pos += len;
1120 }
1121
1122 return 0;
1123 }
1124
1125
1126 static int eap_fast_encrypt_response(struct eap_sm *sm,
1127 struct eap_fast_data *data,
1128 struct wpabuf *resp,
1129 u8 identifier, struct wpabuf **out_data)
1130 {
1131 if (resp == NULL)
1132 return 0;
1133
1134 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1135 resp);
1136 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1137 data->fast_version, identifier,
1138 resp, out_data)) {
1139 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1140 "frame");
1141 }
1142 wpabuf_free(resp);
1143
1144 return 0;
1145 }
1146
1147
1148 static struct wpabuf * eap_fast_pac_request(void)
1149 {
1150 struct wpabuf *tmp;
1151 u8 *pos, *pos2;
1152
1153 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1154 sizeof(struct eap_tlv_request_action_tlv) +
1155 sizeof(struct eap_tlv_pac_type_tlv));
1156 if (tmp == NULL)
1157 return NULL;
1158
1159 pos = wpabuf_put(tmp, 0);
1160 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1161 wpabuf_put(tmp, pos2 - pos);
1162 return tmp;
1163 }
1164
1165
1166 static int eap_fast_process_decrypted(struct eap_sm *sm,
1167 struct eap_fast_data *data,
1168 struct eap_method_ret *ret,
1169 const struct eap_hdr *req,
1170 struct wpabuf *decrypted,
1171 struct wpabuf **out_data)
1172 {
1173 struct wpabuf *resp = NULL, *tmp;
1174 struct eap_fast_tlv_parse tlv;
1175 int failed = 0;
1176
1177 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1178 return 0;
1179 if (resp)
1180 return eap_fast_encrypt_response(sm, data, resp,
1181 req->identifier, out_data);
1182
1183 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1184 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1185 return eap_fast_encrypt_response(sm, data, resp,
1186 req->identifier, out_data);
1187 }
1188
1189 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1190 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1191 return eap_fast_encrypt_response(sm, data, resp,
1192 req->identifier, out_data);
1193 }
1194
1195 if (tlv.crypto_binding) {
1196 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1197 tlv.crypto_binding,
1198 tlv.crypto_binding_len);
1199 if (tmp == NULL)
1200 failed = 1;
1201 else
1202 resp = wpabuf_concat(resp, tmp);
1203 }
1204
1205 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1206 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1207 EAP_TLV_RESULT_SUCCESS, 1);
1208 resp = wpabuf_concat(resp, tmp);
1209 }
1210
1211 if (tlv.eap_payload_tlv) {
1212 tmp = eap_fast_process_eap_payload_tlv(
1213 sm, data, ret, tlv.eap_payload_tlv,
1214 tlv.eap_payload_tlv_len);
1215 resp = wpabuf_concat(resp, tmp);
1216 }
1217
1218 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1219 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1220 "acknowledging success");
1221 failed = 1;
1222 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1223 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1224 tlv.pac_len);
1225 resp = wpabuf_concat(resp, tmp);
1226 }
1227
1228 if (data->current_pac == NULL && data->provisioning &&
1229 !data->anon_provisioning && !tlv.pac &&
1230 (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1231 tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1232 /*
1233 * Need to request Tunnel PAC when using authenticated
1234 * provisioning.
1235 */
1236 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1237 tmp = eap_fast_pac_request();
1238 resp = wpabuf_concat(resp, tmp);
1239 }
1240
1241 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1242 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1243 resp = wpabuf_concat(tmp, resp);
1244 } else if (failed) {
1245 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1246 resp = wpabuf_concat(tmp, resp);
1247 }
1248
1249 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1250 tlv.crypto_binding && data->phase2_success) {
1251 if (data->anon_provisioning) {
1252 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1253 "provisioning completed successfully.");
1254 ret->methodState = METHOD_DONE;
1255 ret->decision = DECISION_FAIL;
1256 sm->expected_failure = 1;
1257 } else {
1258 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1259 "completed successfully.");
1260 if (data->provisioning)
1261 ret->methodState = METHOD_MAY_CONT;
1262 else
1263 ret->methodState = METHOD_DONE;
1264 ret->decision = DECISION_UNCOND_SUCC;
1265 }
1266 }
1267
1268 if (resp == NULL) {
1269 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1270 "empty response packet");
1271 resp = wpabuf_alloc(1);
1272 }
1273
1274 return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1275 out_data);
1276 }
1277
1278
1279 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1280 struct eap_method_ret *ret,
1281 const struct eap_hdr *req,
1282 const struct wpabuf *in_data,
1283 struct wpabuf **out_data)
1284 {
1285 struct wpabuf *in_decrypted;
1286 int res;
1287
1288 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1289 " Phase 2", (unsigned long) wpabuf_len(in_data));
1290
1291 if (data->pending_phase2_req) {
1292 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1293 "skip decryption and use old data");
1294 /* Clear TLS reassembly state. */
1295 eap_peer_tls_reset_input(&data->ssl);
1296
1297 in_decrypted = data->pending_phase2_req;
1298 data->pending_phase2_req = NULL;
1299 goto continue_req;
1300 }
1301
1302 if (wpabuf_len(in_data) == 0) {
1303 /* Received TLS ACK - requesting more fragments */
1304 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1305 data->fast_version,
1306 req->identifier, NULL, out_data);
1307 }
1308
1309 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1310 if (res)
1311 return res;
1312
1313 continue_req:
1314 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1315 in_decrypted);
1316
1317 if (wpabuf_len(in_decrypted) < 4) {
1318 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1319 "TLV frame (len=%lu)",
1320 (unsigned long) wpabuf_len(in_decrypted));
1321 wpabuf_free(in_decrypted);
1322 return -1;
1323 }
1324
1325 res = eap_fast_process_decrypted(sm, data, ret, req,
1326 in_decrypted, out_data);
1327
1328 wpabuf_free(in_decrypted);
1329
1330 return res;
1331 }
1332
1333
1334 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1335 {
1336 const u8 *a_id;
1337 struct pac_tlv_hdr *hdr;
1338
1339 /*
1340 * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1341 * supports both raw A-ID and one inside an A-ID TLV.
1342 */
1343 a_id = buf;
1344 *id_len = len;
1345 if (len > sizeof(*hdr)) {
1346 int tlen;
1347 hdr = (struct pac_tlv_hdr *) buf;
1348 tlen = be_to_host16(hdr->len);
1349 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1350 sizeof(*hdr) + tlen <= len) {
1351 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1352 "(Start)");
1353 a_id = (u8 *) (hdr + 1);
1354 *id_len = tlen;
1355 }
1356 }
1357 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1358
1359 return a_id;
1360 }
1361
1362
1363 static void eap_fast_select_pac(struct eap_fast_data *data,
1364 const u8 *a_id, size_t a_id_len)
1365 {
1366 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1367 PAC_TYPE_TUNNEL_PAC);
1368 if (data->current_pac == NULL) {
1369 /*
1370 * Tunnel PAC was not available for this A-ID. Try to use
1371 * Machine Authentication PAC, if one is available.
1372 */
1373 data->current_pac = eap_fast_get_pac(
1374 data->pac, a_id, a_id_len,
1375 PAC_TYPE_MACHINE_AUTHENTICATION);
1376 }
1377
1378 if (data->current_pac) {
1379 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1380 "(PAC-Type %d)", data->current_pac->pac_type);
1381 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1382 data->current_pac->a_id_info,
1383 data->current_pac->a_id_info_len);
1384 }
1385 }
1386
1387
1388 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1389 struct eap_fast_data *data,
1390 struct eap_fast_pac *pac)
1391 {
1392 u8 *tlv;
1393 size_t tlv_len, olen;
1394 struct eap_tlv_hdr *ehdr;
1395
1396 olen = pac->pac_opaque_len;
1397 tlv_len = sizeof(*ehdr) + olen;
1398 tlv = os_malloc(tlv_len);
1399 if (tlv) {
1400 ehdr = (struct eap_tlv_hdr *) tlv;
1401 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1402 ehdr->length = host_to_be16(olen);
1403 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1404 }
1405 if (tlv == NULL ||
1406 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1407 TLS_EXT_PAC_OPAQUE,
1408 tlv, tlv_len) < 0) {
1409 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1410 "extension");
1411 os_free(tlv);
1412 return -1;
1413 }
1414 os_free(tlv);
1415
1416 return 0;
1417 }
1418
1419
1420 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1421 struct eap_fast_data *data)
1422 {
1423 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1424 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1425 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1426 "TLS extension");
1427 return -1;
1428 }
1429 return 0;
1430 }
1431
1432
1433 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1434 struct eap_fast_data *data)
1435 {
1436 u8 ciphers[5];
1437 int count = 0;
1438
1439 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1440 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1441 "provisioning TLS cipher suites");
1442 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1443 }
1444
1445 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1446 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1447 "provisioning TLS cipher suites");
1448 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1449 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1450 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1451 }
1452
1453 ciphers[count++] = TLS_CIPHER_NONE;
1454
1455 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1456 ciphers)) {
1457 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1458 "cipher suites for provisioning");
1459 return -1;
1460 }
1461
1462 return 0;
1463 }
1464
1465
1466 static int eap_fast_process_start(struct eap_sm *sm,
1467 struct eap_fast_data *data, u8 flags,
1468 const u8 *pos, size_t left)
1469 {
1470 const u8 *a_id;
1471 size_t a_id_len;
1472
1473 /* EAP-FAST Version negotiation (section 3.1) */
1474 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1475 flags & EAP_TLS_VERSION_MASK, data->fast_version);
1476 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1477 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1478 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1479 data->fast_version);
1480
1481 a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1482 eap_fast_select_pac(data, a_id, a_id_len);
1483
1484 if (data->resuming && data->current_pac) {
1485 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1486 "do not add PAC-Opaque to TLS ClientHello");
1487 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1488 return -1;
1489 } else if (data->current_pac) {
1490 /*
1491 * PAC found for the A-ID and we are not resuming an old
1492 * session, so add PAC-Opaque extension to ClientHello.
1493 */
1494 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1495 return -1;
1496 } else {
1497 /* No PAC found, so we must provision one. */
1498 if (!data->provisioning_allowed) {
1499 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1500 "provisioning disabled");
1501 return -1;
1502 }
1503 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1504 "starting provisioning");
1505 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1506 eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1507 return -1;
1508 data->provisioning = 1;
1509 }
1510
1511 return 0;
1512 }
1513
1514
1515 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1516 struct eap_method_ret *ret,
1517 const struct wpabuf *reqData)
1518 {
1519 const struct eap_hdr *req;
1520 size_t left;
1521 int res;
1522 u8 flags, id;
1523 struct wpabuf *resp;
1524 const u8 *pos;
1525 struct eap_fast_data *data = priv;
1526
1527 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1528 reqData, &left, &flags);
1529 if (pos == NULL)
1530 return NULL;
1531
1532 req = wpabuf_head(reqData);
1533 id = req->identifier;
1534
1535 if (flags & EAP_TLS_FLAGS_START) {
1536 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1537 return NULL;
1538
1539 left = 0; /* A-ID is not used in further packet processing */
1540 }
1541
1542 resp = NULL;
1543 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1544 !data->resuming) {
1545 /* Process tunneled (encrypted) phase 2 data. */
1546 struct wpabuf msg;
1547 wpabuf_set(&msg, pos, left);
1548 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1549 if (res < 0) {
1550 ret->methodState = METHOD_DONE;
1551 ret->decision = DECISION_FAIL;
1552 /*
1553 * Ack possible Alert that may have caused failure in
1554 * decryption.
1555 */
1556 res = 1;
1557 }
1558 } else {
1559 /* Continue processing TLS handshake (phase 1). */
1560 res = eap_peer_tls_process_helper(sm, &data->ssl,
1561 EAP_TYPE_FAST,
1562 data->fast_version, id, pos,
1563 left, &resp);
1564
1565 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1566 char cipher[80];
1567 wpa_printf(MSG_DEBUG,
1568 "EAP-FAST: TLS done, proceed to Phase 2");
1569 if (data->provisioning &&
1570 (!(data->provisioning_allowed &
1571 EAP_FAST_PROV_AUTH) ||
1572 tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1573 cipher, sizeof(cipher)) < 0 ||
1574 os_strstr(cipher, "ADH-") ||
1575 os_strstr(cipher, "anon"))) {
1576 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1577 "anonymous (unauthenticated) "
1578 "provisioning");
1579 data->anon_provisioning = 1;
1580 } else
1581 data->anon_provisioning = 0;
1582 data->resuming = 0;
1583 eap_fast_derive_keys(sm, data);
1584 }
1585
1586 if (res == 2) {
1587 struct wpabuf msg;
1588 /*
1589 * Application data included in the handshake message.
1590 */
1591 wpabuf_free(data->pending_phase2_req);
1592 data->pending_phase2_req = resp;
1593 resp = NULL;
1594 wpabuf_set(&msg, pos, left);
1595 res = eap_fast_decrypt(sm, data, ret, req, &msg,
1596 &resp);
1597 }
1598 }
1599
1600 if (res == 1) {
1601 wpabuf_free(resp);
1602 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1603 data->fast_version);
1604 }
1605
1606 return resp;
1607 }
1608
1609
1610 #if 0 /* FIX */
1611 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1612 {
1613 struct eap_fast_data *data = priv;
1614 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1615 }
1616
1617
1618 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1619 {
1620 struct eap_fast_data *data = priv;
1621 os_free(data->key_block_p);
1622 data->key_block_p = NULL;
1623 wpabuf_free(data->pending_phase2_req);
1624 data->pending_phase2_req = NULL;
1625 }
1626
1627
1628 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1629 {
1630 struct eap_fast_data *data = priv;
1631 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1632 os_free(data);
1633 return NULL;
1634 }
1635 os_free(data->session_id);
1636 data->session_id = NULL;
1637 if (data->phase2_priv && data->phase2_method &&
1638 data->phase2_method->init_for_reauth)
1639 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1640 data->phase2_success = 0;
1641 data->resuming = 1;
1642 data->provisioning = 0;
1643 data->anon_provisioning = 0;
1644 data->simck_idx = 0;
1645 return priv;
1646 }
1647 #endif
1648
1649
1650 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1651 size_t buflen, int verbose)
1652 {
1653 struct eap_fast_data *data = priv;
1654 int len, ret;
1655
1656 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1657 if (data->phase2_method) {
1658 ret = os_snprintf(buf + len, buflen - len,
1659 "EAP-FAST Phase2 method=%s\n",
1660 data->phase2_method->name);
1661 if (ret < 0 || (size_t) ret >= buflen - len)
1662 return len;
1663 len += ret;
1664 }
1665 return len;
1666 }
1667
1668
1669 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1670 {
1671 struct eap_fast_data *data = priv;
1672 return data->success;
1673 }
1674
1675
1676 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1677 {
1678 struct eap_fast_data *data = priv;
1679 u8 *key;
1680
1681 if (!data->success)
1682 return NULL;
1683
1684 key = os_malloc(EAP_FAST_KEY_LEN);
1685 if (key == NULL)
1686 return NULL;
1687
1688 *len = EAP_FAST_KEY_LEN;
1689 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1690
1691 return key;
1692 }
1693
1694
1695 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1696 {
1697 struct eap_fast_data *data = priv;
1698 u8 *id;
1699
1700 if (!data->success)
1701 return NULL;
1702
1703 id = os_malloc(data->id_len);
1704 if (id == NULL)
1705 return NULL;
1706
1707 *len = data->id_len;
1708 os_memcpy(id, data->session_id, data->id_len);
1709
1710 return id;
1711 }
1712
1713
1714 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1715 {
1716 struct eap_fast_data *data = priv;
1717 u8 *key;
1718
1719 if (!data->success)
1720 return NULL;
1721
1722 key = os_malloc(EAP_EMSK_LEN);
1723 if (key == NULL)
1724 return NULL;
1725
1726 *len = EAP_EMSK_LEN;
1727 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1728
1729 return key;
1730 }
1731
1732
1733 int eap_peer_fast_register(void)
1734 {
1735 struct eap_method *eap;
1736 int ret;
1737
1738 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1739 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1740 if (eap == NULL)
1741 return -1;
1742
1743 eap->init = eap_fast_init;
1744 eap->deinit = eap_fast_deinit;
1745 eap->process = eap_fast_process;
1746 eap->isKeyAvailable = eap_fast_isKeyAvailable;
1747 eap->getKey = eap_fast_getKey;
1748 eap->getSessionId = eap_fast_get_session_id;
1749 eap->get_status = eap_fast_get_status;
1750 #if 0
1751 eap->has_reauth_data = eap_fast_has_reauth_data;
1752 eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1753 eap->init_for_reauth = eap_fast_init_for_reauth;
1754 #endif
1755 eap->get_emsk = eap_fast_get_emsk;
1756
1757 ret = eap_peer_method_register(eap);
1758 if (ret)
1759 eap_peer_method_free(eap);
1760 return ret;
1761 }
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