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