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Fix cross compilation (e.g. on Darwin). Following changes to make.tmpl,
[AROS.git] / workbench / network / WirelessManager / src / eap_peer / eap_fast.c
blob5d3e69d3cdfe632fce42dd260f6683c5e7976d48
1 /*
2 * EAP peer method: EAP-FAST (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "crypto/tls.h"
19 #include "crypto/sha1.h"
20 #include "eap_common/eap_tlv_common.h"
21 #include "eap_i.h"
22 #include "eap_tls_common.h"
23 #include "eap_config.h"
24 #include "eap_fast_pac.h"
25
26 #ifdef EAP_FAST_DYNAMIC
27 #include "eap_fast_pac.c"
28 #endif /* EAP_FAST_DYNAMIC */
29
30 /* TODO:
31 * - test session resumption and enable it if it interoperates
32 * - password change (pending mschapv2 packet; replay decrypted packet)
33 */
34
35
36 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
37
38
39 struct eap_fast_data {
40 struct eap_ssl_data ssl;
41
42 int fast_version;
43
44 const struct eap_method *phase2_method;
45 void *phase2_priv;
46 int phase2_success;
47
48 struct eap_method_type phase2_type;
49 struct eap_method_type *phase2_types;
50 size_t num_phase2_types;
51 int resuming; /* starting a resumed session */
52 struct eap_fast_key_block_provisioning *key_block_p;
53 #define EAP_FAST_PROV_UNAUTH 1
54 #define EAP_FAST_PROV_AUTH 2
55 int provisioning_allowed; /* Allowed PAC provisioning modes */
56 int provisioning; /* doing PAC provisioning (not the normal auth) */
57 int anon_provisioning; /* doing anonymous (unauthenticated)
58 * provisioning */
59 int session_ticket_used;
60
61 u8 key_data[EAP_FAST_KEY_LEN];
62 u8 emsk[EAP_EMSK_LEN];
63 int success;
64
65 struct eap_fast_pac *pac;
66 struct eap_fast_pac *current_pac;
67 size_t max_pac_list_len;
68 int use_pac_binary_format;
69
70 u8 simck[EAP_FAST_SIMCK_LEN];
71 int simck_idx;
72
73 struct wpabuf *pending_phase2_req;
74 };
75
76
77 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
78 const u8 *client_random,
79 const u8 *server_random,
80 u8 *master_secret)
81 {
82 struct eap_fast_data *data = ctx;
83
84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
85
86 if (client_random == NULL || server_random == NULL ||
87 master_secret == NULL) {
88 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
89 "back to full TLS handshake");
90 data->session_ticket_used = 0;
91 if (data->provisioning_allowed) {
92 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
93 "new PAC-Key");
94 data->provisioning = 1;
95 data->current_pac = NULL;
96 }
97 return 0;
98 }
99
100 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
101
102 if (data->current_pac == NULL) {
103 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
104 "using SessionTicket");
105 data->session_ticket_used = 0;
106 return 0;
107 }
108
109 eap_fast_derive_master_secret(data->current_pac->pac_key,
110 server_random, client_random,
111 master_secret);
112
113 data->session_ticket_used = 1;
114
115 return 1;
116 }
117
118
119 static int eap_fast_parse_phase1(struct eap_fast_data *data,
120 const char *phase1)
121 {
122 const char *pos;
123
124 pos = os_strstr(phase1, "fast_provisioning=");
125 if (pos) {
126 data->provisioning_allowed = atoi(pos + 18);
127 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
128 "mode: %d", data->provisioning_allowed);
129 }
130
131 pos = os_strstr(phase1, "fast_max_pac_list_len=");
132 if (pos) {
133 data->max_pac_list_len = atoi(pos + 22);
134 if (data->max_pac_list_len == 0)
135 data->max_pac_list_len = 1;
136 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
137 (unsigned long) data->max_pac_list_len);
138 }
139
140 pos = os_strstr(phase1, "fast_pac_format=binary");
141 if (pos) {
142 data->use_pac_binary_format = 1;
143 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
144 "list");
145 }
146
147 return 0;
148 }
149
150
151 static void * eap_fast_init(struct eap_sm *sm)
152 {
153 struct eap_fast_data *data;
154 struct eap_peer_config *config = eap_get_config(sm);
155
156 data = os_zalloc(sizeof(*data));
157 if (data == NULL)
158 return NULL;
159 data->fast_version = EAP_FAST_VERSION;
160 data->max_pac_list_len = 10;
161
162 if (config && config->phase1 &&
163 eap_fast_parse_phase1(data, config->phase1) < 0) {
164 eap_fast_deinit(sm, data);
165 return NULL;
166 }
167
168 if (eap_peer_select_phase2_methods(config, "auth=",
169 &data->phase2_types,
170 &data->num_phase2_types) < 0) {
171 eap_fast_deinit(sm, data);
172 return NULL;
173 }
174
175 data->phase2_type.vendor = EAP_VENDOR_IETF;
176 data->phase2_type.method = EAP_TYPE_NONE;
177
178 if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
179 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
180 eap_fast_deinit(sm, data);
181 return NULL;
182 }
183
184 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
185 eap_fast_session_ticket_cb,
186 data) < 0) {
187 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
188 "callback");
189 eap_fast_deinit(sm, data);
190 return NULL;
191 }
192
193 /*
194 * The local RADIUS server in a Cisco AP does not seem to like empty
195 * fragments before data, so disable that workaround for CBC.
196 * TODO: consider making this configurable
197 */
198 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
199 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
200 "workarounds");
201 }
202
203 if (data->use_pac_binary_format &&
204 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
205 eap_fast_deinit(sm, data);
206 return NULL;
207 }
208
209 if (!data->use_pac_binary_format &&
210 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
211 eap_fast_deinit(sm, data);
212 return NULL;
213 }
214 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
215
216 if (data->pac == NULL && !data->provisioning_allowed) {
217 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
218 "provisioning disabled");
219 eap_fast_deinit(sm, data);
220 return NULL;
221 }
222
223 return data;
224 }
225
226
227 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
228 {
229 struct eap_fast_data *data = priv;
230 struct eap_fast_pac *pac, *prev;
231
232 if (data == NULL)
233 return;
234 if (data->phase2_priv && data->phase2_method)
235 data->phase2_method->deinit(sm, data->phase2_priv);
236 os_free(data->phase2_types);
237 os_free(data->key_block_p);
238 eap_peer_tls_ssl_deinit(sm, &data->ssl);
239
240 pac = data->pac;
241 prev = NULL;
242 while (pac) {
243 prev = pac;
244 pac = pac->next;
245 eap_fast_free_pac(prev);
246 }
247 wpabuf_free(data->pending_phase2_req);
248 os_free(data);
249 }
250
251
252 static int eap_fast_derive_msk(struct eap_fast_data *data)
253 {
254 eap_fast_derive_eap_msk(data->simck, data->key_data);
255 eap_fast_derive_eap_emsk(data->simck, data->emsk);
256 data->success = 1;
257 return 0;
258 }
259
260
261 static void eap_fast_derive_key_auth(struct eap_sm *sm,
262 struct eap_fast_data *data)
263 {
264 u8 *sks;
265
266 /* RFC 4851, Section 5.1:
267 * Extra key material after TLS key_block: session_key_seed[40]
268 */
269
270 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
271 EAP_FAST_SKS_LEN);
272 if (sks == NULL) {
273 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
274 "session_key_seed");
275 return;
276 }
277
278 /*
279 * RFC 4851, Section 5.2:
280 * S-IMCK[0] = session_key_seed
281 */
282 wpa_hexdump_key(MSG_DEBUG,
283 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
284 sks, EAP_FAST_SKS_LEN);
285 data->simck_idx = 0;
286 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
287 os_free(sks);
288 }
289
290
291 static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
292 struct eap_fast_data *data)
293 {
294 os_free(data->key_block_p);
295 data->key_block_p = (struct eap_fast_key_block_provisioning *)
296 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
297 "key expansion",
298 sizeof(*data->key_block_p));
299 if (data->key_block_p == NULL) {
300 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
301 return;
302 }
303 /*
304 * RFC 4851, Section 5.2:
305 * S-IMCK[0] = session_key_seed
306 */
307 wpa_hexdump_key(MSG_DEBUG,
308 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
309 data->key_block_p->session_key_seed,
310 sizeof(data->key_block_p->session_key_seed));
311 data->simck_idx = 0;
312 os_memcpy(data->simck, data->key_block_p->session_key_seed,
313 EAP_FAST_SIMCK_LEN);
314 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
315 data->key_block_p->server_challenge,
316 sizeof(data->key_block_p->server_challenge));
317 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
318 data->key_block_p->client_challenge,
319 sizeof(data->key_block_p->client_challenge));
320 }
321
322
323 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
324 {
325 if (data->anon_provisioning)
326 eap_fast_derive_key_provisioning(sm, data);
327 else
328 eap_fast_derive_key_auth(sm, data);
329 }
330
331
332 static int eap_fast_init_phase2_method(struct eap_sm *sm,
333 struct eap_fast_data *data)
334 {
335 data->phase2_method =
336 eap_peer_get_eap_method(data->phase2_type.vendor,
337 data->phase2_type.method);
338 if (data->phase2_method == NULL)
339 return -1;
340
341 if (data->key_block_p) {
342 sm->auth_challenge = data->key_block_p->server_challenge;
343 sm->peer_challenge = data->key_block_p->client_challenge;
344 }
345 sm->init_phase2 = 1;
346 data->phase2_priv = data->phase2_method->init(sm);
347 sm->init_phase2 = 0;
348 sm->auth_challenge = NULL;
349 sm->peer_challenge = NULL;
350
351 return data->phase2_priv == NULL ? -1 : 0;
352 }
353
354
355 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
356 {
357 size_t i;
358
359 /* TODO: TNC with anonymous provisioning; need to require both
360 * completed MSCHAPv2 and TNC */
361
362 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
363 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
364 "during unauthenticated provisioning; reject phase2"
365 " type %d", type);
366 return -1;
367 }
368
369 #ifdef EAP_TNC
370 if (type == EAP_TYPE_TNC) {
371 data->phase2_type.vendor = EAP_VENDOR_IETF;
372 data->phase2_type.method = EAP_TYPE_TNC;
373 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
374 "vendor %d method %d for TNC",
375 data->phase2_type.vendor,
376 data->phase2_type.method);
377 return 0;
378 }
379 #endif /* EAP_TNC */
380
381 for (i = 0; i < data->num_phase2_types; i++) {
382 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
383 data->phase2_types[i].method != type)
384 continue;
385
386 data->phase2_type.vendor = data->phase2_types[i].vendor;
387 data->phase2_type.method = data->phase2_types[i].method;
388 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
389 "vendor %d method %d",
390 data->phase2_type.vendor,
391 data->phase2_type.method);
392 break;
393 }
394
395 if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
396 return -1;
397
398 return 0;
399 }
400
401
402 static int eap_fast_phase2_request(struct eap_sm *sm,
403 struct eap_fast_data *data,
404 struct eap_method_ret *ret,
405 struct eap_hdr *hdr,
406 struct wpabuf **resp)
407 {
408 size_t len = be_to_host16(hdr->length);
409 u8 *pos;
410 struct eap_method_ret iret;
411 struct eap_peer_config *config = eap_get_config(sm);
412 struct wpabuf msg;
413
414 if (len <= sizeof(struct eap_hdr)) {
415 wpa_printf(MSG_INFO, "EAP-FAST: too short "
416 "Phase 2 request (len=%lu)", (unsigned long) len);
417 return -1;
418 }
419 pos = (u8 *) (hdr + 1);
420 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
421 if (*pos == EAP_TYPE_IDENTITY) {
422 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
423 return 0;
424 }
425
426 if (data->phase2_priv && data->phase2_method &&
427 *pos != data->phase2_type.method) {
428 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
429 "deinitialize previous method");
430 data->phase2_method->deinit(sm, data->phase2_priv);
431 data->phase2_method = NULL;
432 data->phase2_priv = NULL;
433 data->phase2_type.vendor = EAP_VENDOR_IETF;
434 data->phase2_type.method = EAP_TYPE_NONE;
435 }
436
437 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
438 data->phase2_type.method == EAP_TYPE_NONE &&
439 eap_fast_select_phase2_method(data, *pos) < 0) {
440 if (eap_peer_tls_phase2_nak(data->phase2_types,
441 data->num_phase2_types,
442 hdr, resp))
443 return -1;
444 return 0;
445 }
446
447 if (data->phase2_priv == NULL &&
448 eap_fast_init_phase2_method(sm, data) < 0) {
449 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
450 "Phase 2 EAP method %d", *pos);
451 ret->methodState = METHOD_DONE;
452 ret->decision = DECISION_FAIL;
453 return -1;
454 }
455
456 os_memset(&iret, 0, sizeof(iret));
457 wpabuf_set(&msg, hdr, len);
458 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
459 &msg);
460 if (*resp == NULL ||
461 (iret.methodState == METHOD_DONE &&
462 iret.decision == DECISION_FAIL)) {
463 ret->methodState = METHOD_DONE;
464 ret->decision = DECISION_FAIL;
465 } else if ((iret.methodState == METHOD_DONE ||
466 iret.methodState == METHOD_MAY_CONT) &&
467 (iret.decision == DECISION_UNCOND_SUCC ||
468 iret.decision == DECISION_COND_SUCC)) {
469 data->phase2_success = 1;
470 }
471
472 if (*resp == NULL && config &&
473 (config->pending_req_identity || config->pending_req_password ||
474 config->pending_req_otp || config->pending_req_new_password)) {
475 wpabuf_free(data->pending_phase2_req);
476 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
477 } else if (*resp == NULL)
478 return -1;
479
480 return 0;
481 }
482
483
484 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
485 {
486 struct wpabuf *buf;
487 struct eap_tlv_nak_tlv *nak;
488 buf = wpabuf_alloc(sizeof(*nak));
489 if (buf == NULL)
490 return NULL;
491 nak = wpabuf_put(buf, sizeof(*nak));
492 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
493 nak->length = host_to_be16(6);
494 nak->vendor_id = host_to_be32(vendor_id);
495 nak->nak_type = host_to_be16(tlv_type);
496 return buf;
497 }
498
499
500 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
501 {
502 struct wpabuf *buf;
503 struct eap_tlv_intermediate_result_tlv *result;
504 buf = wpabuf_alloc(sizeof(*result));
505 if (buf == NULL)
506 return NULL;
507 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
508 intermediate ? "Intermediate " : "", status);
509 result = wpabuf_put(buf, sizeof(*result));
510 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
511 (intermediate ?
512 EAP_TLV_INTERMEDIATE_RESULT_TLV :
513 EAP_TLV_RESULT_TLV));
514 result->length = host_to_be16(2);
515 result->status = host_to_be16(status);
516 return buf;
517 }
518
519
520 static struct wpabuf * eap_fast_tlv_pac_ack(void)
521 {
522 struct wpabuf *buf;
523 struct eap_tlv_result_tlv *res;
524 struct eap_tlv_pac_ack_tlv *ack;
525
526 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
527 if (buf == NULL)
528 return NULL;
529
530 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
531 ack = wpabuf_put(buf, sizeof(*ack));
532 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
533 EAP_TLV_TYPE_MANDATORY);
534 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
535 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
536 ack->pac_len = host_to_be16(2);
537 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
538
539 return buf;
540 }
541
542
543 static struct wpabuf * eap_fast_process_eap_payload_tlv(
544 struct eap_sm *sm, struct eap_fast_data *data,
545 struct eap_method_ret *ret, const struct eap_hdr *req,
546 u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
547 {
548 struct eap_hdr *hdr;
549 struct wpabuf *resp = NULL;
550
551 if (eap_payload_tlv_len < sizeof(*hdr)) {
552 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
553 "Payload TLV (len=%lu)",
554 (unsigned long) eap_payload_tlv_len);
555 return NULL;
556 }
557
558 hdr = (struct eap_hdr *) eap_payload_tlv;
559 if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
560 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
561 "EAP Payload TLV");
562 return NULL;
563 }
564
565 if (hdr->code != EAP_CODE_REQUEST) {
566 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
567 "Phase 2 EAP header", hdr->code);
568 return NULL;
569 }
570
571 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
572 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
573 "failed");
574 return NULL;
575 }
576
577 return eap_fast_tlv_eap_payload(resp);
578 }
579
580
581 static int eap_fast_validate_crypto_binding(
582 struct eap_tlv_crypto_binding_tlv *_bind)
583 {
584 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
585 "Received Version %d SubType %d",
586 _bind->version, _bind->received_version, _bind->subtype);
587 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
588 _bind->nonce, sizeof(_bind->nonce));
589 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
590 _bind->compound_mac, sizeof(_bind->compound_mac));
591
592 if (_bind->version != EAP_FAST_VERSION ||
593 _bind->received_version != EAP_FAST_VERSION ||
594 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
595 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
596 "Crypto-Binding TLV: Version %d "
597 "Received Version %d SubType %d",
598 _bind->version, _bind->received_version,
599 _bind->subtype);
600 return -1;
601 }
602
603 return 0;
604 }
605
606
607 static void eap_fast_write_crypto_binding(
608 struct eap_tlv_crypto_binding_tlv *rbind,
609 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
610 {
611 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
612 EAP_TLV_CRYPTO_BINDING_TLV);
613 rbind->length = host_to_be16(sizeof(*rbind) -
614 sizeof(struct eap_tlv_hdr));
615 rbind->version = EAP_FAST_VERSION;
616 rbind->received_version = _bind->version;
617 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
618 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
619 inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
620 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
621 rbind->compound_mac);
622
623 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
624 "Received Version %d SubType %d",
625 rbind->version, rbind->received_version, rbind->subtype);
626 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
627 rbind->nonce, sizeof(rbind->nonce));
628 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
629 rbind->compound_mac, sizeof(rbind->compound_mac));
630 }
631
632
633 static int eap_fast_get_phase2_key(struct eap_sm *sm,
634 struct eap_fast_data *data,
635 u8 *isk, size_t isk_len)
636 {
637 u8 *key;
638 size_t key_len;
639
640 os_memset(isk, 0, isk_len);
641
642 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
643 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
644 "available");
645 return -1;
646 }
647
648 if (data->phase2_method->isKeyAvailable == NULL ||
649 data->phase2_method->getKey == NULL)
650 return 0;
651
652 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
653 (key = data->phase2_method->getKey(sm, data->phase2_priv,
654 &key_len)) == NULL) {
655 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
656 "from Phase 2");
657 return -1;
658 }
659
660 if (key_len > isk_len)
661 key_len = isk_len;
662 if (key_len == 32 &&
663 data->phase2_method->vendor == EAP_VENDOR_IETF &&
664 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
665 /*
666 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
667 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
668 * ISK for EAP-FAST cryptobinding.
669 */
670 os_memcpy(isk, key + 16, 16);
671 os_memcpy(isk + 16, key, 16);
672 } else
673 os_memcpy(isk, key, key_len);
674 os_free(key);
675
676 return 0;
677 }
678
679
680 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
681 u8 *cmk)
682 {
683 u8 isk[32], imck[60];
684
685 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
686 "calculation", data->simck_idx + 1);
687
688 /*
689 * RFC 4851, Section 5.2:
690 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
691 * MSK[j], 60)
692 * S-IMCK[j] = first 40 octets of IMCK[j]
693 * CMK[j] = last 20 octets of IMCK[j]
694 */
695
696 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
697 return -1;
698 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
699 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
700 "Inner Methods Compound Keys",
701 isk, sizeof(isk), imck, sizeof(imck));
702 data->simck_idx++;
703 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
704 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
705 data->simck, EAP_FAST_SIMCK_LEN);
706 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
707 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
708 cmk, EAP_FAST_CMK_LEN);
709
710 return 0;
711 }
712
713
714 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
715 {
716 struct eap_tlv_hdr *pac;
717 struct eap_tlv_request_action_tlv *act;
718 struct eap_tlv_pac_type_tlv *type;
719
720 act = (struct eap_tlv_request_action_tlv *) pos;
721 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
722 act->length = host_to_be16(2);
723 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
724
725 pac = (struct eap_tlv_hdr *) (act + 1);
726 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
727 pac->length = host_to_be16(sizeof(*type));
728
729 type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
730 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
731 type->length = host_to_be16(2);
732 type->pac_type = host_to_be16(pac_type);
733
734 return (u8 *) (type + 1);
735 }
736
737
738 static struct wpabuf * eap_fast_process_crypto_binding(
739 struct eap_sm *sm, struct eap_fast_data *data,
740 struct eap_method_ret *ret,
741 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
742 {
743 struct wpabuf *resp;
744 u8 *pos;
745 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
746 int res;
747 size_t len;
748
749 if (eap_fast_validate_crypto_binding(_bind) < 0)
750 return NULL;
751
752 if (eap_fast_get_cmk(sm, data, cmk) < 0)
753 return NULL;
754
755 /* Validate received Compound MAC */
756 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
757 os_memset(_bind->compound_mac, 0, sizeof(cmac));
758 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
759 "MAC calculation", (u8 *) _bind, bind_len);
760 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
761 _bind->compound_mac);
762 res = os_memcmp(cmac, _bind->compound_mac, sizeof(cmac));
763 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
764 cmac, sizeof(cmac));
765 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
766 _bind->compound_mac, sizeof(cmac));
767 if (res != 0) {
768 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
769 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
770 return NULL;
771 }
772
773 /*
774 * Compound MAC was valid, so authentication succeeded. Reply with
775 * crypto binding to allow server to complete authentication.
776 */
777
778 len = sizeof(struct eap_tlv_crypto_binding_tlv);
779 resp = wpabuf_alloc(len);
780 if (resp == NULL)
781 return NULL;
782
783 if (!data->anon_provisioning && data->phase2_success &&
784 eap_fast_derive_msk(data) < 0) {
785 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
786 ret->methodState = METHOD_DONE;
787 ret->decision = DECISION_FAIL;
788 data->phase2_success = 0;
789 wpabuf_free(resp);
790 return NULL;
791 }
792
793 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
794 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
795 pos, _bind, cmk);
796
797 return resp;
798 }
799
800
801 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
802 u8 *pos, size_t len, int *pac_key_found)
803 {
804 switch (type & 0x7fff) {
805 case PAC_TYPE_PAC_KEY:
806 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
807 if (len != EAP_FAST_PAC_KEY_LEN) {
808 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
809 "length %lu", (unsigned long) len);
810 break;
811 }
812 *pac_key_found = 1;
813 os_memcpy(entry->pac_key, pos, len);
814 break;
815 case PAC_TYPE_PAC_OPAQUE:
816 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
817 entry->pac_opaque = pos;
818 entry->pac_opaque_len = len;
819 break;
820 case PAC_TYPE_PAC_INFO:
821 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
822 entry->pac_info = pos;
823 entry->pac_info_len = len;
824 break;
825 default:
826 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
827 type);
828 break;
829 }
830 }
831
832
833 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
834 u8 *pac, size_t pac_len)
835 {
836 struct pac_tlv_hdr *hdr;
837 u8 *pos;
838 size_t left, len;
839 int type, pac_key_found = 0;
840
841 pos = pac;
842 left = pac_len;
843
844 while (left > sizeof(*hdr)) {
845 hdr = (struct pac_tlv_hdr *) pos;
846 type = be_to_host16(hdr->type);
847 len = be_to_host16(hdr->len);
848 pos += sizeof(*hdr);
849 left -= sizeof(*hdr);
850 if (len > left) {
851 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
852 "(type=%d len=%lu left=%lu)",
853 type, (unsigned long) len,
854 (unsigned long) left);
855 return -1;
856 }
857
858 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
859
860 pos += len;
861 left -= len;
862 }
863
864 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
865 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
866 "all the required fields");
867 return -1;
868 }
869
870 return 0;
871 }
872
873
874 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
875 u8 *pos, size_t len)
876 {
877 u16 pac_type;
878 u32 lifetime;
879 struct os_time now;
880
881 switch (type & 0x7fff) {
882 case PAC_TYPE_CRED_LIFETIME:
883 if (len != 4) {
884 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
885 "Invalid CRED_LIFETIME length - ignored",
886 pos, len);
887 return 0;
888 }
889
890 /*
891 * This is not currently saved separately in PAC files since
892 * the server can automatically initiate PAC update when
893 * needed. Anyway, the information is available from PAC-Info
894 * dump if it is needed for something in the future.
895 */
896 lifetime = WPA_GET_BE32(pos);
897 os_get_time(&now);
898 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
899 "(%d days)",
900 lifetime, (lifetime - (u32) now.sec) / 86400);
901 break;
902 case PAC_TYPE_A_ID:
903 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
904 pos, len);
905 entry->a_id = pos;
906 entry->a_id_len = len;
907 break;
908 case PAC_TYPE_I_ID:
909 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
910 pos, len);
911 entry->i_id = pos;
912 entry->i_id_len = len;
913 break;
914 case PAC_TYPE_A_ID_INFO:
915 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
916 pos, len);
917 entry->a_id_info = pos;
918 entry->a_id_info_len = len;
919 break;
920 case PAC_TYPE_PAC_TYPE:
921 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
922 if (len != 2) {
923 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
924 "length %lu (expected 2)",
925 (unsigned long) len);
926 wpa_hexdump_ascii(MSG_DEBUG,
927 "EAP-FAST: PAC-Info - PAC-Type",
928 pos, len);
929 return -1;
930 }
931 pac_type = WPA_GET_BE16(pos);
932 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
933 pac_type != PAC_TYPE_USER_AUTHORIZATION &&
934 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
935 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
936 "%d", pac_type);
937 return -1;
938 }
939
940 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
941 pac_type);
942 entry->pac_type = pac_type;
943 break;
944 default:
945 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
946 "type %d", type);
947 break;
948 }
949
950 return 0;
951 }
952
953
954 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
955 {
956 struct pac_tlv_hdr *hdr;
957 u8 *pos;
958 size_t left, len;
959 int type;
960
961 /* RFC 5422, Section 4.2.4 */
962
963 /* PAC-Type defaults to Tunnel PAC (Type 1) */
964 entry->pac_type = PAC_TYPE_TUNNEL_PAC;
965
966 pos = entry->pac_info;
967 left = entry->pac_info_len;
968 while (left > sizeof(*hdr)) {
969 hdr = (struct pac_tlv_hdr *) pos;
970 type = be_to_host16(hdr->type);
971 len = be_to_host16(hdr->len);
972 pos += sizeof(*hdr);
973 left -= sizeof(*hdr);
974 if (len > left) {
975 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
976 "(type=%d len=%lu left=%lu)",
977 type, (unsigned long) len,
978 (unsigned long) left);
979 return -1;
980 }
981
982 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
983 return -1;
984
985 pos += len;
986 left -= len;
987 }
988
989 if (entry->a_id == NULL || entry->a_id_info == NULL) {
990 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
991 "all the required fields");
992 return -1;
993 }
994
995 return 0;
996 }
997
998
999 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1000 struct eap_fast_data *data,
1001 struct eap_method_ret *ret,
1002 u8 *pac, size_t pac_len)
1003 {
1004 struct eap_peer_config *config = eap_get_config(sm);
1005 struct eap_fast_pac entry;
1006
1007 os_memset(&entry, 0, sizeof(entry));
1008 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1009 eap_fast_process_pac_info(&entry))
1010 return NULL;
1011
1012 eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1013 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1014 if (data->use_pac_binary_format)
1015 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1016 else
1017 eap_fast_save_pac(sm, data->pac, config->pac_file);
1018
1019 if (data->provisioning) {
1020 if (data->anon_provisioning) {
1021 /*
1022 * Unauthenticated provisioning does not provide keying
1023 * material and must end with an EAP-Failure.
1024 * Authentication will be done separately after this.
1025 */
1026 data->success = 0;
1027 ret->decision = DECISION_FAIL;
1028 } else {
1029 /*
1030 * Server may or may not allow authenticated
1031 * provisioning also for key generation.
1032 */
1033 ret->decision = DECISION_COND_SUCC;
1034 }
1035 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1036 "- Provisioning completed successfully");
1037 } else {
1038 /*
1039 * This is PAC refreshing, i.e., normal authentication that is
1040 * expected to be completed with an EAP-Success.
1041 */
1042 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1043 "- PAC refreshing completed successfully");
1044 ret->decision = DECISION_UNCOND_SUCC;
1045 }
1046 ret->methodState = METHOD_DONE;
1047 return eap_fast_tlv_pac_ack();
1048 }
1049
1050
1051 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1052 struct eap_fast_tlv_parse *tlv,
1053 struct wpabuf **resp)
1054 {
1055 int mandatory, tlv_type, len, res;
1056 u8 *pos, *end;
1057
1058 os_memset(tlv, 0, sizeof(*tlv));
1059
1060 /* Parse TLVs from the decrypted Phase 2 data */
1061 pos = wpabuf_mhead(decrypted);
1062 end = pos + wpabuf_len(decrypted);
1063 while (pos + 4 < end) {
1064 mandatory = pos[0] & 0x80;
1065 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1066 pos += 2;
1067 len = WPA_GET_BE16(pos);
1068 pos += 2;
1069 if (pos + len > end) {
1070 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1071 return -1;
1072 }
1073 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1074 "TLV type %d length %d%s",
1075 tlv_type, len, mandatory ? " (mandatory)" : "");
1076
1077 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1078 if (res == -2)
1079 break;
1080 if (res < 0) {
1081 if (mandatory) {
1082 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1083 "mandatory TLV type %d", tlv_type);
1084 *resp = eap_fast_tlv_nak(0, tlv_type);
1085 break;
1086 } else {
1087 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1088 "unknown optional TLV type %d",
1089 tlv_type);
1090 }
1091 }
1092
1093 pos += len;
1094 }
1095
1096 return 0;
1097 }
1098
1099
1100 static int eap_fast_encrypt_response(struct eap_sm *sm,
1101 struct eap_fast_data *data,
1102 struct wpabuf *resp,
1103 u8 identifier, struct wpabuf **out_data)
1104 {
1105 if (resp == NULL)
1106 return 0;
1107
1108 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1109 resp);
1110 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1111 data->fast_version, identifier,
1112 resp, out_data)) {
1113 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1114 "frame");
1115 }
1116 wpabuf_free(resp);
1117
1118 return 0;
1119 }
1120
1121
1122 static struct wpabuf * eap_fast_pac_request(void)
1123 {
1124 struct wpabuf *tmp;
1125 u8 *pos, *pos2;
1126
1127 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1128 sizeof(struct eap_tlv_request_action_tlv) +
1129 sizeof(struct eap_tlv_pac_type_tlv));
1130 if (tmp == NULL)
1131 return NULL;
1132
1133 pos = wpabuf_put(tmp, 0);
1134 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1135 wpabuf_put(tmp, pos2 - pos);
1136 return tmp;
1137 }
1138
1139
1140 static int eap_fast_process_decrypted(struct eap_sm *sm,
1141 struct eap_fast_data *data,
1142 struct eap_method_ret *ret,
1143 const struct eap_hdr *req,
1144 struct wpabuf *decrypted,
1145 struct wpabuf **out_data)
1146 {
1147 struct wpabuf *resp = NULL, *tmp;
1148 struct eap_fast_tlv_parse tlv;
1149 int failed = 0;
1150
1151 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1152 return 0;
1153 if (resp)
1154 return eap_fast_encrypt_response(sm, data, resp,
1155 req->identifier, out_data);
1156
1157 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1158 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1159 return eap_fast_encrypt_response(sm, data, resp,
1160 req->identifier, out_data);
1161 }
1162
1163 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1164 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1165 return eap_fast_encrypt_response(sm, data, resp,
1166 req->identifier, out_data);
1167 }
1168
1169 if (tlv.crypto_binding) {
1170 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1171 tlv.crypto_binding,
1172 tlv.crypto_binding_len);
1173 if (tmp == NULL)
1174 failed = 1;
1175 else
1176 resp = wpabuf_concat(resp, tmp);
1177 }
1178
1179 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1180 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1181 EAP_TLV_RESULT_SUCCESS, 1);
1182 resp = wpabuf_concat(resp, tmp);
1183 }
1184
1185 if (tlv.eap_payload_tlv) {
1186 tmp = eap_fast_process_eap_payload_tlv(
1187 sm, data, ret, req, tlv.eap_payload_tlv,
1188 tlv.eap_payload_tlv_len);
1189 resp = wpabuf_concat(resp, tmp);
1190 }
1191
1192 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1193 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1194 "acknowledging success");
1195 failed = 1;
1196 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1197 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1198 tlv.pac_len);
1199 resp = wpabuf_concat(resp, tmp);
1200 }
1201
1202 if (data->current_pac == NULL && data->provisioning &&
1203 !data->anon_provisioning && !tlv.pac &&
1204 (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1205 tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1206 /*
1207 * Need to request Tunnel PAC when using authenticated
1208 * provisioning.
1209 */
1210 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1211 tmp = eap_fast_pac_request();
1212 resp = wpabuf_concat(resp, tmp);
1213 }
1214
1215 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1216 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1217 resp = wpabuf_concat(tmp, resp);
1218 } else if (failed) {
1219 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1220 resp = wpabuf_concat(tmp, resp);
1221 }
1222
1223 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1224 tlv.crypto_binding && data->phase2_success) {
1225 if (data->anon_provisioning) {
1226 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1227 "provisioning completed successfully.");
1228 ret->methodState = METHOD_DONE;
1229 ret->decision = DECISION_FAIL;
1230 } else {
1231 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1232 "completed successfully.");
1233 if (data->provisioning)
1234 ret->methodState = METHOD_MAY_CONT;
1235 else
1236 ret->methodState = METHOD_DONE;
1237 ret->decision = DECISION_UNCOND_SUCC;
1238 }
1239 }
1240
1241 if (resp == NULL) {
1242 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1243 "empty response packet");
1244 resp = wpabuf_alloc(1);
1245 }
1246
1247 return eap_fast_encrypt_response(sm, data, resp, req->identifier,
1248 out_data);
1249 }
1250
1251
1252 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1253 struct eap_method_ret *ret,
1254 const struct eap_hdr *req,
1255 const struct wpabuf *in_data,
1256 struct wpabuf **out_data)
1257 {
1258 struct wpabuf *in_decrypted;
1259 int res;
1260
1261 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1262 " Phase 2", (unsigned long) wpabuf_len(in_data));
1263
1264 if (data->pending_phase2_req) {
1265 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1266 "skip decryption and use old data");
1267 /* Clear TLS reassembly state. */
1268 eap_peer_tls_reset_input(&data->ssl);
1269
1270 in_decrypted = data->pending_phase2_req;
1271 data->pending_phase2_req = NULL;
1272 goto continue_req;
1273 }
1274
1275 if (wpabuf_len(in_data) == 0) {
1276 /* Received TLS ACK - requesting more fragments */
1277 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1278 data->fast_version,
1279 req->identifier, NULL, out_data);
1280 }
1281
1282 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1283 if (res)
1284 return res;
1285
1286 continue_req:
1287 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1288 in_decrypted);
1289
1290 if (wpabuf_len(in_decrypted) < 4) {
1291 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1292 "TLV frame (len=%lu)",
1293 (unsigned long) wpabuf_len(in_decrypted));
1294 wpabuf_free(in_decrypted);
1295 return -1;
1296 }
1297
1298 res = eap_fast_process_decrypted(sm, data, ret, req,
1299 in_decrypted, out_data);
1300
1301 wpabuf_free(in_decrypted);
1302
1303 return res;
1304 }
1305
1306
1307 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1308 {
1309 const u8 *a_id;
1310 struct pac_tlv_hdr *hdr;
1311
1312 /*
1313 * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1314 * supports both raw A-ID and one inside an A-ID TLV.
1315 */
1316 a_id = buf;
1317 *id_len = len;
1318 if (len > sizeof(*hdr)) {
1319 int tlen;
1320 hdr = (struct pac_tlv_hdr *) buf;
1321 tlen = be_to_host16(hdr->len);
1322 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1323 sizeof(*hdr) + tlen <= len) {
1324 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1325 "(Start)");
1326 a_id = (u8 *) (hdr + 1);
1327 *id_len = tlen;
1328 }
1329 }
1330 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1331
1332 return a_id;
1333 }
1334
1335
1336 static void eap_fast_select_pac(struct eap_fast_data *data,
1337 const u8 *a_id, size_t a_id_len)
1338 {
1339 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1340 PAC_TYPE_TUNNEL_PAC);
1341 if (data->current_pac == NULL) {
1342 /*
1343 * Tunnel PAC was not available for this A-ID. Try to use
1344 * Machine Authentication PAC, if one is available.
1345 */
1346 data->current_pac = eap_fast_get_pac(
1347 data->pac, a_id, a_id_len,
1348 PAC_TYPE_MACHINE_AUTHENTICATION);
1349 }
1350
1351 if (data->current_pac) {
1352 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1353 "(PAC-Type %d)", data->current_pac->pac_type);
1354 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1355 data->current_pac->a_id_info,
1356 data->current_pac->a_id_info_len);
1357 }
1358 }
1359
1360
1361 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1362 struct eap_fast_data *data,
1363 struct eap_fast_pac *pac)
1364 {
1365 u8 *tlv;
1366 size_t tlv_len, olen;
1367 struct eap_tlv_hdr *ehdr;
1368
1369 olen = pac->pac_opaque_len;
1370 tlv_len = sizeof(*ehdr) + olen;
1371 tlv = os_malloc(tlv_len);
1372 if (tlv) {
1373 ehdr = (struct eap_tlv_hdr *) tlv;
1374 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1375 ehdr->length = host_to_be16(olen);
1376 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1377 }
1378 if (tlv == NULL ||
1379 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1380 TLS_EXT_PAC_OPAQUE,
1381 tlv, tlv_len) < 0) {
1382 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1383 "extension");
1384 os_free(tlv);
1385 return -1;
1386 }
1387 os_free(tlv);
1388
1389 return 0;
1390 }
1391
1392
1393 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1394 struct eap_fast_data *data)
1395 {
1396 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1397 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1398 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1399 "TLS extension");
1400 return -1;
1401 }
1402 return 0;
1403 }
1404
1405
1406 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1407 struct eap_fast_data *data)
1408 {
1409 u8 ciphers[5];
1410 int count = 0;
1411
1412 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1413 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1414 "provisioning TLS cipher suites");
1415 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1416 }
1417
1418 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1419 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1420 "provisioning TLS cipher suites");
1421 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1422 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1423 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1424 }
1425
1426 ciphers[count++] = TLS_CIPHER_NONE;
1427
1428 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1429 ciphers)) {
1430 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1431 "cipher suites for provisioning");
1432 return -1;
1433 }
1434
1435 return 0;
1436 }
1437
1438
1439 static int eap_fast_process_start(struct eap_sm *sm,
1440 struct eap_fast_data *data, u8 flags,
1441 const u8 *pos, size_t left)
1442 {
1443 const u8 *a_id;
1444 size_t a_id_len;
1445
1446 /* EAP-FAST Version negotiation (section 3.1) */
1447 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1448 flags & EAP_TLS_VERSION_MASK, data->fast_version);
1449 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1450 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1451 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1452 data->fast_version);
1453
1454 a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1455 eap_fast_select_pac(data, a_id, a_id_len);
1456
1457 if (data->resuming && data->current_pac) {
1458 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1459 "do not add PAC-Opaque to TLS ClientHello");
1460 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1461 return -1;
1462 } else if (data->current_pac) {
1463 /*
1464 * PAC found for the A-ID and we are not resuming an old
1465 * session, so add PAC-Opaque extension to ClientHello.
1466 */
1467 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1468 return -1;
1469 } else {
1470 /* No PAC found, so we must provision one. */
1471 if (!data->provisioning_allowed) {
1472 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1473 "provisioning disabled");
1474 return -1;
1475 }
1476 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1477 "starting provisioning");
1478 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1479 eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1480 return -1;
1481 data->provisioning = 1;
1482 }
1483
1484 return 0;
1485 }
1486
1487
1488 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1489 struct eap_method_ret *ret,
1490 const struct wpabuf *reqData)
1491 {
1492 const struct eap_hdr *req;
1493 size_t left;
1494 int res;
1495 u8 flags, id;
1496 struct wpabuf *resp;
1497 const u8 *pos;
1498 struct eap_fast_data *data = priv;
1499
1500 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1501 reqData, &left, &flags);
1502 if (pos == NULL)
1503 return NULL;
1504
1505 req = wpabuf_head(reqData);
1506 id = req->identifier;
1507
1508 if (flags & EAP_TLS_FLAGS_START) {
1509 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1510 return NULL;
1511
1512 left = 0; /* A-ID is not used in further packet processing */
1513 }
1514
1515 resp = NULL;
1516 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1517 !data->resuming) {
1518 /* Process tunneled (encrypted) phase 2 data. */
1519 struct wpabuf msg;
1520 wpabuf_set(&msg, pos, left);
1521 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
1522 if (res < 0) {
1523 ret->methodState = METHOD_DONE;
1524 ret->decision = DECISION_FAIL;
1525 /*
1526 * Ack possible Alert that may have caused failure in
1527 * decryption.
1528 */
1529 res = 1;
1530 }
1531 } else {
1532 /* Continue processing TLS handshake (phase 1). */
1533 res = eap_peer_tls_process_helper(sm, &data->ssl,
1534 EAP_TYPE_FAST,
1535 data->fast_version, id, pos,
1536 left, &resp);
1537
1538 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1539 char cipher[80];
1540 wpa_printf(MSG_DEBUG,
1541 "EAP-FAST: TLS done, proceed to Phase 2");
1542 if (data->provisioning &&
1543 (!(data->provisioning_allowed &
1544 EAP_FAST_PROV_AUTH) ||
1545 tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1546 cipher, sizeof(cipher)) < 0 ||
1547 os_strstr(cipher, "ADH-") ||
1548 os_strstr(cipher, "anon"))) {
1549 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1550 "anonymous (unauthenticated) "
1551 "provisioning");
1552 data->anon_provisioning = 1;
1553 } else
1554 data->anon_provisioning = 0;
1555 data->resuming = 0;
1556 eap_fast_derive_keys(sm, data);
1557 }
1558
1559 if (res == 2) {
1560 struct wpabuf msg;
1561 /*
1562 * Application data included in the handshake message.
1563 */
1564 wpabuf_free(data->pending_phase2_req);
1565 data->pending_phase2_req = resp;
1566 resp = NULL;
1567 wpabuf_set(&msg, pos, left);
1568 res = eap_fast_decrypt(sm, data, ret, req, &msg,
1569 &resp);
1570 }
1571 }
1572
1573 if (res == 1) {
1574 wpabuf_free(resp);
1575 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1576 data->fast_version);
1577 }
1578
1579 return resp;
1580 }
1581
1582
1583 #if 0 /* FIX */
1584 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1585 {
1586 struct eap_fast_data *data = priv;
1587 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1588 }
1589
1590
1591 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1592 {
1593 struct eap_fast_data *data = priv;
1594 os_free(data->key_block_p);
1595 data->key_block_p = NULL;
1596 wpabuf_free(data->pending_phase2_req);
1597 data->pending_phase2_req = NULL;
1598 }
1599
1600
1601 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1602 {
1603 struct eap_fast_data *data = priv;
1604 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1605 os_free(data);
1606 return NULL;
1607 }
1608 if (data->phase2_priv && data->phase2_method &&
1609 data->phase2_method->init_for_reauth)
1610 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1611 data->phase2_success = 0;
1612 data->resuming = 1;
1613 data->provisioning = 0;
1614 data->anon_provisioning = 0;
1615 data->simck_idx = 0;
1616 return priv;
1617 }
1618 #endif
1619
1620
1621 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1622 size_t buflen, int verbose)
1623 {
1624 struct eap_fast_data *data = priv;
1625 int len, ret;
1626
1627 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1628 if (data->phase2_method) {
1629 ret = os_snprintf(buf + len, buflen - len,
1630 "EAP-FAST Phase2 method=%s\n",
1631 data->phase2_method->name);
1632 if (ret < 0 || (size_t) ret >= buflen - len)
1633 return len;
1634 len += ret;
1635 }
1636 return len;
1637 }
1638
1639
1640 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1641 {
1642 struct eap_fast_data *data = priv;
1643 return data->success;
1644 }
1645
1646
1647 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1648 {
1649 struct eap_fast_data *data = priv;
1650 u8 *key;
1651
1652 if (!data->success)
1653 return NULL;
1654
1655 key = os_malloc(EAP_FAST_KEY_LEN);
1656 if (key == NULL)
1657 return NULL;
1658
1659 *len = EAP_FAST_KEY_LEN;
1660 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1661
1662 return key;
1663 }
1664
1665
1666 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1667 {
1668 struct eap_fast_data *data = priv;
1669 u8 *key;
1670
1671 if (!data->success)
1672 return NULL;
1673
1674 key = os_malloc(EAP_EMSK_LEN);
1675 if (key == NULL)
1676 return NULL;
1677
1678 *len = EAP_EMSK_LEN;
1679 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1680
1681 return key;
1682 }
1683
1684
1685 int eap_peer_fast_register(void)
1686 {
1687 struct eap_method *eap;
1688 int ret;
1689
1690 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1691 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1692 if (eap == NULL)
1693 return -1;
1694
1695 eap->init = eap_fast_init;
1696 eap->deinit = eap_fast_deinit;
1697 eap->process = eap_fast_process;
1698 eap->isKeyAvailable = eap_fast_isKeyAvailable;
1699 eap->getKey = eap_fast_getKey;
1700 eap->get_status = eap_fast_get_status;
1701 #if 0
1702 eap->has_reauth_data = eap_fast_has_reauth_data;
1703 eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1704 eap->init_for_reauth = eap_fast_init_for_reauth;
1705 #endif
1706 eap->get_emsk = eap_fast_get_emsk;
1707
1708 ret = eap_peer_method_register(eap);
1709 if (ret)
1710 eap_peer_method_free(eap);
1711 return ret;
1712 }
Mirror of AROS' svn.