1 /*
2 * EAP peer method: EAP-FAST (RFC 4851)
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/tls.h"
13 #include "crypto/sha1.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_i.h"
16 #include "eap_tls_common.h"
17 #include "eap_config.h"
18 #include "eap_fast_pac.h"
19
20 #ifdef EAP_FAST_DYNAMIC
21 #include "eap_fast_pac.c"
22 #endif /* EAP_FAST_DYNAMIC */
23
24 /* TODO:
25 * - test session resumption and enable it if it interoperates
26 * - password change (pending mschapv2 packet; replay decrypted packet)
27 */
28
29
30 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
31
32
33 struct eap_fast_data {
34 struct eap_ssl_data ssl;
35
36 int fast_version;
37
38 const struct eap_method *phase2_method;
39 void *phase2_priv;
40 int phase2_success;
41
42 struct eap_method_type phase2_type;
43 struct eap_method_type *phase2_types;
44 size_t num_phase2_types;
45 int resuming; /* starting a resumed session */
46 struct eap_fast_key_block_provisioning *key_block_p;
47 #define EAP_FAST_PROV_UNAUTH 1
48 #define EAP_FAST_PROV_AUTH 2
49 int provisioning_allowed; /* Allowed PAC provisioning modes */
50 int provisioning; /* doing PAC provisioning (not the normal auth) */
51 int anon_provisioning; /* doing anonymous (unauthenticated)
52 * provisioning */
53 int session_ticket_used;
54
55 u8 key_data[EAP_FAST_KEY_LEN];
56 u8 *session_id;
57 size_t id_len;
58 u8 emsk[EAP_EMSK_LEN];
59 int success;
60
61 struct eap_fast_pac *pac;
62 struct eap_fast_pac *current_pac;
63 size_t max_pac_list_len;
64 int use_pac_binary_format;
65
66 u8 simck[EAP_FAST_SIMCK_LEN];
67 int simck_idx;
68
69 struct wpabuf *pending_phase2_req;
70 struct wpabuf *pending_resp;
71 };
72
73
eap_fast_session_ticket_cb(void * ctx,const u8 * ticket,size_t len,const u8 * client_random,const u8 * server_random,u8 * master_secret)74 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
75 const u8 *client_random,
76 const u8 *server_random,
77 u8 *master_secret)
78 {
79 struct eap_fast_data *data = ctx;
80
81 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
82
83 if (client_random == NULL || server_random == NULL ||
84 master_secret == NULL) {
85 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
86 "back to full TLS handshake");
87 data->session_ticket_used = 0;
88 if (data->provisioning_allowed) {
89 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
90 "new PAC-Key");
91 data->provisioning = 1;
92 data->current_pac = NULL;
93 }
94 return 0;
95 }
96
97 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
98
99 if (data->current_pac == NULL) {
100 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
101 "using SessionTicket");
102 data->session_ticket_used = 0;
103 return 0;
104 }
105
106 eap_fast_derive_master_secret(data->current_pac->pac_key,
107 server_random, client_random,
108 master_secret);
109
110 data->session_ticket_used = 1;
111
112 return 1;
113 }
114
115
eap_fast_parse_phase1(struct eap_fast_data * data,const char * phase1)116 static void eap_fast_parse_phase1(struct eap_fast_data *data,
117 const char *phase1)
118 {
119 const char *pos;
120
121 pos = os_strstr(phase1, "fast_provisioning=");
122 if (pos) {
123 data->provisioning_allowed = atoi(pos + 18);
124 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
125 "mode: %d", data->provisioning_allowed);
126 }
127
128 pos = os_strstr(phase1, "fast_max_pac_list_len=");
129 if (pos) {
130 data->max_pac_list_len = atoi(pos + 22);
131 if (data->max_pac_list_len == 0)
132 data->max_pac_list_len = 1;
133 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
134 (unsigned long) data->max_pac_list_len);
135 }
136
137 pos = os_strstr(phase1, "fast_pac_format=binary");
138 if (pos) {
139 data->use_pac_binary_format = 1;
140 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
141 "list");
142 }
143 }
144
145
eap_fast_init(struct eap_sm * sm)146 static void * eap_fast_init(struct eap_sm *sm)
147 {
148 struct eap_fast_data *data;
149 struct eap_peer_config *config = eap_get_config(sm);
150
151 if (config == NULL)
152 return NULL;
153
154 data = os_zalloc(sizeof(*data));
155 if (data == NULL)
156 return NULL;
157 data->fast_version = EAP_FAST_VERSION;
158 data->max_pac_list_len = 10;
159
160 if (config->phase1)
161 eap_fast_parse_phase1(data, config->phase1);
162
163 if (eap_peer_select_phase2_methods(config, "auth=",
164 &data->phase2_types,
165 &data->num_phase2_types, 0) < 0) {
166 eap_fast_deinit(sm, data);
167 return NULL;
168 }
169
170 data->phase2_type.vendor = EAP_VENDOR_IETF;
171 data->phase2_type.method = EAP_TYPE_NONE;
172
173 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
174 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
175 eap_fast_deinit(sm, data);
176 return NULL;
177 }
178
179 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
180 eap_fast_session_ticket_cb,
181 data) < 0) {
182 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
183 "callback");
184 eap_fast_deinit(sm, data);
185 return NULL;
186 }
187
188 /*
189 * The local RADIUS server in a Cisco AP does not seem to like empty
190 * fragments before data, so disable that workaround for CBC.
191 * TODO: consider making this configurable
192 */
193 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
194 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
195 "workarounds");
196 }
197
198 if (!config->pac_file) {
199 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
200 eap_fast_deinit(sm, data);
201 return NULL;
202 }
203
204 if (data->use_pac_binary_format &&
205 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
206 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
207 eap_fast_deinit(sm, data);
208 return NULL;
209 }
210
211 if (!data->use_pac_binary_format &&
212 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
213 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
214 eap_fast_deinit(sm, data);
215 return NULL;
216 }
217 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
218
219 if (data->pac == NULL && !data->provisioning_allowed) {
220 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
221 "provisioning disabled");
222 eap_fast_deinit(sm, data);
223 return NULL;
224 }
225
226 return data;
227 }
228
229
eap_fast_deinit(struct eap_sm * sm,void * priv)230 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
231 {
232 struct eap_fast_data *data = priv;
233 struct eap_fast_pac *pac, *prev;
234
235 if (data == NULL)
236 return;
237 if (data->phase2_priv && data->phase2_method)
238 data->phase2_method->deinit(sm, data->phase2_priv);
239 os_free(data->phase2_types);
240 os_free(data->key_block_p);
241 eap_peer_tls_ssl_deinit(sm, &data->ssl);
242
243 pac = data->pac;
244 prev = NULL;
245 while (pac) {
246 prev = pac;
247 pac = pac->next;
248 eap_fast_free_pac(prev);
249 }
250 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
251 os_memset(data->emsk, 0, EAP_EMSK_LEN);
252 os_free(data->session_id);
253 wpabuf_clear_free(data->pending_phase2_req);
254 wpabuf_clear_free(data->pending_resp);
255 os_free(data);
256 }
257
258
eap_fast_derive_msk(struct eap_fast_data * data)259 static int eap_fast_derive_msk(struct eap_fast_data *data)
260 {
261 if (eap_fast_derive_eap_msk(data->simck, data->key_data) < 0 ||
262 eap_fast_derive_eap_emsk(data->simck, data->emsk) < 0)
263 return -1;
264 data->success = 1;
265 return 0;
266 }
267
268
eap_fast_derive_key_auth(struct eap_sm * sm,struct eap_fast_data * data)269 static int eap_fast_derive_key_auth(struct eap_sm *sm,
270 struct eap_fast_data *data)
271 {
272 u8 *sks;
273
274 /* RFC 4851, Section 5.1:
275 * Extra key material after TLS key_block: session_key_seed[40]
276 */
277
278 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
279 EAP_FAST_SKS_LEN);
280 if (sks == NULL) {
281 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
282 "session_key_seed");
283 return -1;
284 }
285
286 /*
287 * RFC 4851, Section 5.2:
288 * S-IMCK[0] = session_key_seed
289 */
290 wpa_hexdump_key(MSG_DEBUG,
291 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
292 sks, EAP_FAST_SKS_LEN);
293 data->simck_idx = 0;
294 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
295 os_free(sks);
296 return 0;
297 }
298
299
eap_fast_derive_key_provisioning(struct eap_sm * sm,struct eap_fast_data * data)300 static int eap_fast_derive_key_provisioning(struct eap_sm *sm,
301 struct eap_fast_data *data)
302 {
303 os_free(data->key_block_p);
304 data->key_block_p = (struct eap_fast_key_block_provisioning *)
305 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
306 sizeof(*data->key_block_p));
307 if (data->key_block_p == NULL) {
308 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
309 return -1;
310 }
311 /*
312 * RFC 4851, Section 5.2:
313 * S-IMCK[0] = session_key_seed
314 */
315 wpa_hexdump_key(MSG_DEBUG,
316 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
317 data->key_block_p->session_key_seed,
318 sizeof(data->key_block_p->session_key_seed));
319 data->simck_idx = 0;
320 os_memcpy(data->simck, data->key_block_p->session_key_seed,
321 EAP_FAST_SIMCK_LEN);
322 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
323 data->key_block_p->server_challenge,
324 sizeof(data->key_block_p->server_challenge));
325 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
326 data->key_block_p->client_challenge,
327 sizeof(data->key_block_p->client_challenge));
328 return 0;
329 }
330
331
eap_fast_derive_keys(struct eap_sm * sm,struct eap_fast_data * data)332 static int eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
333 {
334 int res;
335
336 if (data->anon_provisioning)
337 res = eap_fast_derive_key_provisioning(sm, data);
338 else
339 res = eap_fast_derive_key_auth(sm, data);
340 return res;
341 }
342
343
eap_fast_init_phase2_method(struct eap_sm * sm,struct eap_fast_data * data)344 static int eap_fast_init_phase2_method(struct eap_sm *sm,
345 struct eap_fast_data *data)
346 {
347 data->phase2_method =
348 eap_peer_get_eap_method(data->phase2_type.vendor,
349 data->phase2_type.method);
350 if (data->phase2_method == NULL)
351 return -1;
352
353 if (data->key_block_p) {
354 sm->auth_challenge = data->key_block_p->server_challenge;
355 sm->peer_challenge = data->key_block_p->client_challenge;
356 }
357 sm->eap_fast_mschapv2 = true;
358 sm->init_phase2 = 1;
359 data->phase2_priv = data->phase2_method->init(sm);
360 sm->init_phase2 = 0;
361 sm->auth_challenge = NULL;
362 sm->peer_challenge = NULL;
363
364 return data->phase2_priv == NULL ? -1 : 0;
365 }
366
367
eap_fast_select_phase2_method(struct eap_fast_data * data,int vendor,enum eap_type type)368 static int eap_fast_select_phase2_method(struct eap_fast_data *data,
369 int vendor, enum eap_type type)
370 {
371 size_t i;
372
373 /* TODO: TNC with anonymous provisioning; need to require both
374 * completed MSCHAPv2 and TNC */
375
376 if (data->anon_provisioning &&
377 (vendor != EAP_VENDOR_IETF || type != EAP_TYPE_MSCHAPV2)) {
378 wpa_printf(MSG_INFO,
379 "EAP-FAST: Only EAP-MSCHAPv2 is allowed during unauthenticated provisioning; reject phase2 type %u:%u",
380 vendor, type);
381 return -1;
382 }
383
384 #ifdef EAP_TNC
385 if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_TNC) {
386 data->phase2_type.vendor = EAP_VENDOR_IETF;
387 data->phase2_type.method = EAP_TYPE_TNC;
388 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
389 "vendor %d method %d for TNC",
390 data->phase2_type.vendor,
391 data->phase2_type.method);
392 return 0;
393 }
394 #endif /* EAP_TNC */
395
396 for (i = 0; i < data->num_phase2_types; i++) {
397 if (data->phase2_types[i].vendor != vendor ||
398 data->phase2_types[i].method != type)
399 continue;
400
401 data->phase2_type.vendor = data->phase2_types[i].vendor;
402 data->phase2_type.method = data->phase2_types[i].method;
403 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
404 "vendor %d method %d",
405 data->phase2_type.vendor,
406 data->phase2_type.method);
407 break;
408 }
409
410 if (vendor != data->phase2_type.vendor ||
411 type != data->phase2_type.method ||
412 (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_NONE))
413 return -1;
414
415 return 0;
416 }
417
418
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)419 static int eap_fast_phase2_request(struct eap_sm *sm,
420 struct eap_fast_data *data,
421 struct eap_method_ret *ret,
422 struct eap_hdr *hdr,
423 struct wpabuf **resp)
424 {
425 size_t len = be_to_host16(hdr->length);
426 u8 *pos;
427 struct eap_method_ret iret;
428 struct eap_peer_config *config = eap_get_config(sm);
429 struct wpabuf msg;
430 int vendor = EAP_VENDOR_IETF;
431 enum eap_type method;
432
433 if (len <= sizeof(struct eap_hdr)) {
434 wpa_printf(MSG_INFO, "EAP-FAST: too short "
435 "Phase 2 request (len=%lu)", (unsigned long) len);
436 return -1;
437 }
438 pos = (u8 *) (hdr + 1);
439 method = *pos;
440 if (method == EAP_TYPE_EXPANDED) {
441 if (len < sizeof(struct eap_hdr) + 8) {
442 wpa_printf(MSG_INFO,
443 "EAP-FAST: Too short Phase 2 request (expanded header) (len=%lu)",
444 (unsigned long) len);
445 return -1;
446 }
447 vendor = WPA_GET_BE24(pos + 1);
448 method = WPA_GET_BE32(pos + 4);
449 }
450 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%u:%u",
451 vendor, method);
452 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_IDENTITY) {
453 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
454 return 0;
455 }
456
457 if (data->phase2_priv && data->phase2_method &&
458 (vendor != data->phase2_type.vendor ||
459 method != data->phase2_type.method)) {
460 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
461 "deinitialize previous method");
462 data->phase2_method->deinit(sm, data->phase2_priv);
463 data->phase2_method = NULL;
464 data->phase2_priv = NULL;
465 data->phase2_type.vendor = EAP_VENDOR_IETF;
466 data->phase2_type.method = EAP_TYPE_NONE;
467 }
468
469 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
470 data->phase2_type.method == EAP_TYPE_NONE &&
471 eap_fast_select_phase2_method(data, vendor, method) < 0) {
472 if (eap_peer_tls_phase2_nak(data->phase2_types,
473 data->num_phase2_types,
474 hdr, resp))
475 return -1;
476 return 0;
477 }
478
479 if ((data->phase2_priv == NULL &&
480 eap_fast_init_phase2_method(sm, data) < 0) ||
481 data->phase2_method == NULL) {
482 wpa_printf(MSG_INFO,
483 "EAP-FAST: Failed to initialize Phase 2 EAP method %u:%u",
484 vendor, method);
485 ret->methodState = METHOD_DONE;
486 ret->decision = DECISION_FAIL;
487 return -1;
488 }
489
490 os_memset(&iret, 0, sizeof(iret));
491 wpabuf_set(&msg, hdr, len);
492 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
493 &msg);
494 if (*resp == NULL ||
495 (iret.methodState == METHOD_DONE &&
496 iret.decision == DECISION_FAIL)) {
497 ret->methodState = METHOD_DONE;
498 ret->decision = DECISION_FAIL;
499 } else if ((iret.methodState == METHOD_DONE ||
500 iret.methodState == METHOD_MAY_CONT) &&
501 (iret.decision == DECISION_UNCOND_SUCC ||
502 iret.decision == DECISION_COND_SUCC)) {
503 data->phase2_success = 1;
504 }
505
506 if (*resp == NULL && config &&
507 (config->pending_req_identity || config->pending_req_password ||
508 config->pending_req_otp || config->pending_req_new_password ||
509 config->pending_req_sim)) {
510 wpabuf_clear_free(data->pending_phase2_req);
511 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
512 } else if (*resp == NULL)
513 return -1;
514
515 return 0;
516 }
517
518
eap_fast_tlv_nak(int vendor_id,int tlv_type)519 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
520 {
521 struct wpabuf *buf;
522 struct eap_tlv_nak_tlv *nak;
523 buf = wpabuf_alloc(sizeof(*nak));
524 if (buf == NULL)
525 return NULL;
526 nak = wpabuf_put(buf, sizeof(*nak));
527 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
528 nak->length = host_to_be16(6);
529 nak->vendor_id = host_to_be32(vendor_id);
530 nak->nak_type = host_to_be16(tlv_type);
531 return buf;
532 }
533
534
eap_fast_tlv_result(int status,int intermediate)535 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
536 {
537 struct wpabuf *buf;
538 struct eap_tlv_intermediate_result_tlv *result;
539 buf = wpabuf_alloc(sizeof(*result));
540 if (buf == NULL)
541 return NULL;
542 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
543 intermediate ? "Intermediate " : "", status);
544 result = wpabuf_put(buf, sizeof(*result));
545 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
546 (intermediate ?
547 EAP_TLV_INTERMEDIATE_RESULT_TLV :
548 EAP_TLV_RESULT_TLV));
549 result->length = host_to_be16(2);
550 result->status = host_to_be16(status);
551 return buf;
552 }
553
554
eap_fast_tlv_pac_ack(void)555 static struct wpabuf * eap_fast_tlv_pac_ack(void)
556 {
557 struct wpabuf *buf;
558 struct eap_tlv_result_tlv *res;
559 struct eap_tlv_pac_ack_tlv *ack;
560
561 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
562 if (buf == NULL)
563 return NULL;
564
565 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
566 ack = wpabuf_put(buf, sizeof(*ack));
567 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
568 EAP_TLV_TYPE_MANDATORY);
569 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
570 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
571 ack->pac_len = host_to_be16(2);
572 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
573
574 return buf;
575 }
576
577
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)578 static struct wpabuf * eap_fast_process_eap_payload_tlv(
579 struct eap_sm *sm, struct eap_fast_data *data,
580 struct eap_method_ret *ret,
581 u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
582 {
583 struct eap_hdr *hdr;
584 struct wpabuf *resp = NULL;
585
586 if (eap_payload_tlv_len < sizeof(*hdr)) {
587 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
588 "Payload TLV (len=%lu)",
589 (unsigned long) eap_payload_tlv_len);
590 return NULL;
591 }
592
593 hdr = (struct eap_hdr *) eap_payload_tlv;
594 if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
595 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
596 "EAP Payload TLV");
597 return NULL;
598 }
599
600 if (hdr->code != EAP_CODE_REQUEST) {
601 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
602 "Phase 2 EAP header", hdr->code);
603 return NULL;
604 }
605
606 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
607 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
608 "failed");
609 return NULL;
610 }
611
612 return eap_fast_tlv_eap_payload(resp);
613 }
614
615
eap_fast_validate_crypto_binding(struct eap_tlv_crypto_binding_tlv * _bind)616 static int eap_fast_validate_crypto_binding(
617 struct eap_tlv_crypto_binding_tlv *_bind)
618 {
619 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
620 "Received Version %d SubType %d",
621 _bind->version, _bind->received_version, _bind->subtype);
622 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
623 _bind->nonce, sizeof(_bind->nonce));
624 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
625 _bind->compound_mac, sizeof(_bind->compound_mac));
626
627 if (_bind->version != EAP_FAST_VERSION ||
628 _bind->received_version != EAP_FAST_VERSION ||
629 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
630 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
631 "Crypto-Binding TLV: Version %d "
632 "Received Version %d SubType %d",
633 _bind->version, _bind->received_version,
634 _bind->subtype);
635 return -1;
636 }
637
638 return 0;
639 }
640
641
eap_fast_write_crypto_binding(struct eap_tlv_crypto_binding_tlv * rbind,struct eap_tlv_crypto_binding_tlv * _bind,const u8 * cmk)642 static void eap_fast_write_crypto_binding(
643 struct eap_tlv_crypto_binding_tlv *rbind,
644 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
645 {
646 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
647 EAP_TLV_CRYPTO_BINDING_TLV);
648 rbind->length = host_to_be16(sizeof(*rbind) -
649 sizeof(struct eap_tlv_hdr));
650 rbind->version = EAP_FAST_VERSION;
651 rbind->received_version = _bind->version;
652 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
653 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
654 inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
655 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
656 rbind->compound_mac);
657
658 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
659 "Received Version %d SubType %d",
660 rbind->version, rbind->received_version, rbind->subtype);
661 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
662 rbind->nonce, sizeof(rbind->nonce));
663 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
664 rbind->compound_mac, sizeof(rbind->compound_mac));
665 }
666
667
eap_fast_get_phase2_key(struct eap_sm * sm,struct eap_fast_data * data,u8 * isk,size_t isk_len)668 static int eap_fast_get_phase2_key(struct eap_sm *sm,
669 struct eap_fast_data *data,
670 u8 *isk, size_t isk_len)
671 {
672 u8 *key;
673 size_t key_len;
674
675 os_memset(isk, 0, isk_len);
676
677 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
678 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
679 "available");
680 return -1;
681 }
682
683 if (data->phase2_method->isKeyAvailable == NULL ||
684 data->phase2_method->getKey == NULL)
685 return 0;
686
687 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
688 (key = data->phase2_method->getKey(sm, data->phase2_priv,
689 &key_len)) == NULL) {
690 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
691 "from Phase 2");
692 return -1;
693 }
694
695 if (key_len > isk_len)
696 key_len = isk_len;
697 os_memcpy(isk, key, key_len);
698 os_free(key);
699
700 return 0;
701 }
702
703
eap_fast_get_cmk(struct eap_sm * sm,struct eap_fast_data * data,u8 * cmk)704 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
705 u8 *cmk)
706 {
707 u8 isk[32], imck[60];
708
709 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
710 "calculation", data->simck_idx + 1);
711
712 /*
713 * RFC 4851, Section 5.2:
714 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
715 * MSK[j], 60)
716 * S-IMCK[j] = first 40 octets of IMCK[j]
717 * CMK[j] = last 20 octets of IMCK[j]
718 */
719
720 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
721 return -1;
722 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
723 if (sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
724 "Inner Methods Compound Keys",
725 isk, sizeof(isk), imck, sizeof(imck)) < 0)
726 return -1;
727 data->simck_idx++;
728 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
729 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
730 data->simck, EAP_FAST_SIMCK_LEN);
731 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
732 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
733 cmk, EAP_FAST_CMK_LEN);
734
735 return 0;
736 }
737
738
eap_fast_write_pac_request(u8 * pos,u16 pac_type)739 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
740 {
741 struct eap_tlv_hdr *pac;
742 struct eap_tlv_request_action_tlv *act;
743 struct eap_tlv_pac_type_tlv *type;
744
745 act = (struct eap_tlv_request_action_tlv *) pos;
746 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
747 act->length = host_to_be16(2);
748 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
749
750 pac = (struct eap_tlv_hdr *) (act + 1);
751 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
752 pac->length = host_to_be16(sizeof(*type));
753
754 type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
755 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
756 type->length = host_to_be16(2);
757 type->pac_type = host_to_be16(pac_type);
758
759 return (u8 *) (type + 1);
760 }
761
762
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)763 static struct wpabuf * eap_fast_process_crypto_binding(
764 struct eap_sm *sm, struct eap_fast_data *data,
765 struct eap_method_ret *ret,
766 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
767 {
768 struct wpabuf *resp;
769 u8 *pos;
770 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
771 int res;
772 size_t len;
773
774 if (eap_fast_validate_crypto_binding(_bind) < 0)
775 return NULL;
776
777 if (eap_fast_get_cmk(sm, data, cmk) < 0)
778 return NULL;
779
780 /* Validate received Compound MAC */
781 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
782 os_memset(_bind->compound_mac, 0, sizeof(cmac));
783 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
784 "MAC calculation", (u8 *) _bind, bind_len);
785 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
786 _bind->compound_mac);
787 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac));
788 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
789 cmac, sizeof(cmac));
790 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
791 _bind->compound_mac, sizeof(cmac));
792 if (res != 0) {
793 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
794 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
795 return NULL;
796 }
797
798 /*
799 * Compound MAC was valid, so authentication succeeded. Reply with
800 * crypto binding to allow server to complete authentication.
801 */
802
803 len = sizeof(struct eap_tlv_crypto_binding_tlv);
804 resp = wpabuf_alloc(len);
805 if (resp == NULL)
806 return NULL;
807
808 if (!data->anon_provisioning && data->phase2_success &&
809 eap_fast_derive_msk(data) < 0) {
810 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
811 ret->methodState = METHOD_DONE;
812 ret->decision = DECISION_FAIL;
813 data->phase2_success = 0;
814 wpabuf_clear_free(resp);
815 return NULL;
816 }
817
818 if (!data->anon_provisioning && data->phase2_success) {
819 os_free(data->session_id);
820 data->session_id = eap_peer_tls_derive_session_id(
821 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
822 if (data->session_id) {
823 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
824 data->session_id, data->id_len);
825 } else {
826 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
827 "Session-Id");
828 wpabuf_clear_free(resp);
829 return NULL;
830 }
831 }
832
833 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
834 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
835 pos, _bind, cmk);
836
837 return resp;
838 }
839
840
eap_fast_parse_pac_tlv(struct eap_fast_pac * entry,int type,u8 * pos,size_t len,int * pac_key_found)841 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
842 u8 *pos, size_t len, int *pac_key_found)
843 {
844 switch (type & 0x7fff) {
845 case PAC_TYPE_PAC_KEY:
846 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
847 if (len != EAP_FAST_PAC_KEY_LEN) {
848 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
849 "length %lu", (unsigned long) len);
850 break;
851 }
852 *pac_key_found = 1;
853 os_memcpy(entry->pac_key, pos, len);
854 break;
855 case PAC_TYPE_PAC_OPAQUE:
856 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
857 entry->pac_opaque = pos;
858 entry->pac_opaque_len = len;
859 break;
860 case PAC_TYPE_PAC_INFO:
861 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
862 entry->pac_info = pos;
863 entry->pac_info_len = len;
864 break;
865 default:
866 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
867 type);
868 break;
869 }
870 }
871
872
eap_fast_process_pac_tlv(struct eap_fast_pac * entry,u8 * pac,size_t pac_len)873 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
874 u8 *pac, size_t pac_len)
875 {
876 struct pac_tlv_hdr *hdr;
877 u8 *pos;
878 size_t left, len;
879 int type, pac_key_found = 0;
880
881 pos = pac;
882 left = pac_len;
883
884 while (left > sizeof(*hdr)) {
885 hdr = (struct pac_tlv_hdr *) pos;
886 type = be_to_host16(hdr->type);
887 len = be_to_host16(hdr->len);
888 pos += sizeof(*hdr);
889 left -= sizeof(*hdr);
890 if (len > left) {
891 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
892 "(type=%d len=%lu left=%lu)",
893 type, (unsigned long) len,
894 (unsigned long) left);
895 return -1;
896 }
897
898 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
899
900 pos += len;
901 left -= len;
902 }
903
904 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
905 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
906 "all the required fields");
907 return -1;
908 }
909
910 return 0;
911 }
912
913
eap_fast_parse_pac_info(struct eap_fast_pac * entry,int type,u8 * pos,size_t len)914 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
915 u8 *pos, size_t len)
916 {
917 u16 pac_type;
918 u32 lifetime;
919 struct os_time now;
920
921 switch (type & 0x7fff) {
922 case PAC_TYPE_CRED_LIFETIME:
923 if (len != 4) {
924 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
925 "Invalid CRED_LIFETIME length - ignored",
926 pos, len);
927 return 0;
928 }
929
930 /*
931 * This is not currently saved separately in PAC files since
932 * the server can automatically initiate PAC update when
933 * needed. Anyway, the information is available from PAC-Info
934 * dump if it is needed for something in the future.
935 */
936 lifetime = WPA_GET_BE32(pos);
937 os_get_time(&now);
938 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
939 "(%d days)",
940 lifetime, (lifetime - (u32) now.sec) / 86400);
941 break;
942 case PAC_TYPE_A_ID:
943 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
944 pos, len);
945 entry->a_id = pos;
946 entry->a_id_len = len;
947 break;
948 case PAC_TYPE_I_ID:
949 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
950 pos, len);
951 entry->i_id = pos;
952 entry->i_id_len = len;
953 break;
954 case PAC_TYPE_A_ID_INFO:
955 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
956 pos, len);
957 entry->a_id_info = pos;
958 entry->a_id_info_len = len;
959 break;
960 case PAC_TYPE_PAC_TYPE:
961 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
962 if (len != 2) {
963 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
964 "length %lu (expected 2)",
965 (unsigned long) len);
966 wpa_hexdump_ascii(MSG_DEBUG,
967 "EAP-FAST: PAC-Info - PAC-Type",
968 pos, len);
969 return -1;
970 }
971 pac_type = WPA_GET_BE16(pos);
972 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
973 pac_type != PAC_TYPE_USER_AUTHORIZATION &&
974 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
975 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
976 "%d", pac_type);
977 return -1;
978 }
979
980 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
981 pac_type);
982 entry->pac_type = pac_type;
983 break;
984 default:
985 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
986 "type %d", type);
987 break;
988 }
989
990 return 0;
991 }
992
993
eap_fast_process_pac_info(struct eap_fast_pac * entry)994 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
995 {
996 struct pac_tlv_hdr *hdr;
997 u8 *pos;
998 size_t left, len;
999 int type;
1000
1001 /* RFC 5422, Section 4.2.4 */
1002
1003 /* PAC-Type defaults to Tunnel PAC (Type 1) */
1004 entry->pac_type = PAC_TYPE_TUNNEL_PAC;
1005
1006 pos = entry->pac_info;
1007 left = entry->pac_info_len;
1008 while (left > sizeof(*hdr)) {
1009 hdr = (struct pac_tlv_hdr *) pos;
1010 type = be_to_host16(hdr->type);
1011 len = be_to_host16(hdr->len);
1012 pos += sizeof(*hdr);
1013 left -= sizeof(*hdr);
1014 if (len > left) {
1015 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
1016 "(type=%d len=%lu left=%lu)",
1017 type, (unsigned long) len,
1018 (unsigned long) left);
1019 return -1;
1020 }
1021
1022 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
1023 return -1;
1024
1025 pos += len;
1026 left -= len;
1027 }
1028
1029 if (entry->a_id == NULL || entry->a_id_info == NULL) {
1030 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1031 "all the required fields");
1032 return -1;
1033 }
1034
1035 return 0;
1036 }
1037
1038
eap_fast_process_pac(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,u8 * pac,size_t pac_len)1039 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1040 struct eap_fast_data *data,
1041 struct eap_method_ret *ret,
1042 u8 *pac, size_t pac_len)
1043 {
1044 struct eap_peer_config *config = eap_get_config(sm);
1045 struct eap_fast_pac entry;
1046
1047 os_memset(&entry, 0, sizeof(entry));
1048 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1049 eap_fast_process_pac_info(&entry))
1050 return NULL;
1051
1052 eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1053 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1054 if (data->use_pac_binary_format)
1055 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1056 else
1057 eap_fast_save_pac(sm, data->pac, config->pac_file);
1058
1059 if (data->provisioning) {
1060 if (data->anon_provisioning) {
1061 /*
1062 * Unauthenticated provisioning does not provide keying
1063 * material and must end with an EAP-Failure.
1064 * Authentication will be done separately after this.
1065 */
1066 data->success = 0;
1067 ret->decision = DECISION_FAIL;
1068 } else {
1069 /*
1070 * Server may or may not allow authenticated
1071 * provisioning also for key generation.
1072 */
1073 ret->decision = DECISION_COND_SUCC;
1074 }
1075 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1076 "- Provisioning completed successfully");
1077 sm->expected_failure = 1;
1078 } else {
1079 /*
1080 * This is PAC refreshing, i.e., normal authentication that is
1081 * expected to be completed with an EAP-Success. However,
1082 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1083 * after protected success exchange in case of EAP-Fast
1084 * provisioning, so we better use DECISION_COND_SUCC here
1085 * instead of DECISION_UNCOND_SUCC.
1086 */
1087 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1088 "- PAC refreshing completed successfully");
1089 ret->decision = DECISION_COND_SUCC;
1090 }
1091 ret->methodState = METHOD_DONE;
1092 return eap_fast_tlv_pac_ack();
1093 }
1094
1095
eap_fast_parse_decrypted(struct wpabuf * decrypted,struct eap_fast_tlv_parse * tlv,struct wpabuf ** resp)1096 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1097 struct eap_fast_tlv_parse *tlv,
1098 struct wpabuf **resp)
1099 {
1100 int mandatory, tlv_type, res;
1101 size_t len;
1102 u8 *pos, *end;
1103
1104 os_memset(tlv, 0, sizeof(*tlv));
1105
1106 /* Parse TLVs from the decrypted Phase 2 data */
1107 pos = wpabuf_mhead(decrypted);
1108 end = pos + wpabuf_len(decrypted);
1109 while (end - pos > 4) {
1110 mandatory = pos[0] & 0x80;
1111 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1112 pos += 2;
1113 len = WPA_GET_BE16(pos);
1114 pos += 2;
1115 if (len > (size_t) (end - pos)) {
1116 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1117 return -1;
1118 }
1119 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1120 "TLV type %d length %u%s",
1121 tlv_type, (unsigned int) len,
1122 mandatory ? " (mandatory)" : "");
1123
1124 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1125 if (res == -2)
1126 break;
1127 if (res < 0) {
1128 if (mandatory) {
1129 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1130 "mandatory TLV type %d", tlv_type);
1131 *resp = eap_fast_tlv_nak(0, tlv_type);
1132 break;
1133 } else {
1134 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1135 "unknown optional TLV type %d",
1136 tlv_type);
1137 }
1138 }
1139
1140 pos += len;
1141 }
1142
1143 return 0;
1144 }
1145
1146
eap_fast_encrypt_response(struct eap_sm * sm,struct eap_fast_data * data,struct wpabuf * resp,u8 identifier,struct wpabuf ** out_data)1147 static int eap_fast_encrypt_response(struct eap_sm *sm,
1148 struct eap_fast_data *data,
1149 struct wpabuf *resp,
1150 u8 identifier, struct wpabuf **out_data)
1151 {
1152 if (resp == NULL)
1153 return 0;
1154
1155 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1156 resp);
1157 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1158 data->fast_version, identifier,
1159 resp, out_data)) {
1160 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1161 "frame");
1162 }
1163 wpabuf_clear_free(resp);
1164
1165 return 0;
1166 }
1167
1168
eap_fast_pac_request(void)1169 static struct wpabuf * eap_fast_pac_request(void)
1170 {
1171 struct wpabuf *tmp;
1172 u8 *pos, *pos2;
1173
1174 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1175 sizeof(struct eap_tlv_request_action_tlv) +
1176 sizeof(struct eap_tlv_pac_type_tlv));
1177 if (tmp == NULL)
1178 return NULL;
1179
1180 pos = wpabuf_put(tmp, 0);
1181 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1182 wpabuf_put(tmp, pos2 - pos);
1183 return tmp;
1184 }
1185
1186
eap_fast_process_decrypted(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,u8 identifier,struct wpabuf * decrypted,struct wpabuf ** out_data)1187 static int eap_fast_process_decrypted(struct eap_sm *sm,
1188 struct eap_fast_data *data,
1189 struct eap_method_ret *ret,
1190 u8 identifier,
1191 struct wpabuf *decrypted,
1192 struct wpabuf **out_data)
1193 {
1194 struct wpabuf *resp = NULL, *tmp;
1195 struct eap_fast_tlv_parse tlv;
1196 int failed = 0;
1197
1198 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1199 return 0;
1200 if (resp)
1201 return eap_fast_encrypt_response(sm, data, resp,
1202 identifier, out_data);
1203
1204 if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1205 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1206 return eap_fast_encrypt_response(sm, data, resp,
1207 identifier, out_data);
1208 }
1209
1210 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1211 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1212 return eap_fast_encrypt_response(sm, data, resp,
1213 identifier, out_data);
1214 }
1215
1216 if (tlv.crypto_binding) {
1217 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1218 tlv.crypto_binding,
1219 tlv.crypto_binding_len);
1220 if (tmp == NULL)
1221 failed = 1;
1222 else
1223 resp = wpabuf_concat(resp, tmp);
1224 }
1225
1226 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1227 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1228 EAP_TLV_RESULT_SUCCESS, 1);
1229 resp = wpabuf_concat(resp, tmp);
1230 }
1231
1232 if (tlv.eap_payload_tlv) {
1233 tmp = eap_fast_process_eap_payload_tlv(
1234 sm, data, ret, tlv.eap_payload_tlv,
1235 tlv.eap_payload_tlv_len);
1236 resp = wpabuf_concat(resp, tmp);
1237 }
1238
1239 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1240 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1241 "acknowledging success");
1242 failed = 1;
1243 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1244 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1245 tlv.pac_len);
1246 resp = wpabuf_concat(resp, tmp);
1247 }
1248
1249 if (data->current_pac == NULL && data->provisioning &&
1250 !data->anon_provisioning && !tlv.pac &&
1251 (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1252 tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1253 /*
1254 * Need to request Tunnel PAC when using authenticated
1255 * provisioning.
1256 */
1257 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1258 tmp = eap_fast_pac_request();
1259 resp = wpabuf_concat(resp, tmp);
1260 }
1261
1262 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1263 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1264 resp = wpabuf_concat(tmp, resp);
1265 } else if (failed) {
1266 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1267 resp = wpabuf_concat(tmp, resp);
1268 }
1269
1270 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1271 tlv.crypto_binding && data->phase2_success) {
1272 if (data->anon_provisioning) {
1273 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1274 "provisioning completed successfully.");
1275 ret->methodState = METHOD_DONE;
1276 ret->decision = DECISION_FAIL;
1277 sm->expected_failure = 1;
1278 } else {
1279 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1280 "completed successfully.");
1281 if (data->provisioning)
1282 ret->methodState = METHOD_MAY_CONT;
1283 else
1284 ret->methodState = METHOD_DONE;
1285 ret->decision = DECISION_UNCOND_SUCC;
1286 }
1287 }
1288
1289 if (resp == NULL) {
1290 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1291 "empty response packet");
1292 resp = wpabuf_alloc(1);
1293 }
1294
1295 return eap_fast_encrypt_response(sm, data, resp, identifier,
1296 out_data);
1297 }
1298
1299
eap_fast_decrypt(struct eap_sm * sm,struct eap_fast_data * data,struct eap_method_ret * ret,u8 identifier,const struct wpabuf * in_data,struct wpabuf ** out_data)1300 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1301 struct eap_method_ret *ret, u8 identifier,
1302 const struct wpabuf *in_data,
1303 struct wpabuf **out_data)
1304 {
1305 struct wpabuf *in_decrypted;
1306 int res;
1307
1308 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1309 " Phase 2", (unsigned long) wpabuf_len(in_data));
1310
1311 if (data->pending_phase2_req) {
1312 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1313 "skip decryption and use old data");
1314 /* Clear TLS reassembly state. */
1315 eap_peer_tls_reset_input(&data->ssl);
1316
1317 in_decrypted = data->pending_phase2_req;
1318 data->pending_phase2_req = NULL;
1319 goto continue_req;
1320 }
1321
1322 if (wpabuf_len(in_data) == 0) {
1323 /* Received TLS ACK - requesting more fragments */
1324 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1325 data->fast_version,
1326 identifier, NULL, out_data);
1327 }
1328
1329 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1330 if (res)
1331 return res;
1332
1333 continue_req:
1334 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1335 in_decrypted);
1336
1337 if (wpabuf_len(in_decrypted) < 4) {
1338 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1339 "TLV frame (len=%lu)",
1340 (unsigned long) wpabuf_len(in_decrypted));
1341 wpabuf_clear_free(in_decrypted);
1342 return -1;
1343 }
1344
1345 res = eap_fast_process_decrypted(sm, data, ret, identifier,
1346 in_decrypted, out_data);
1347
1348 wpabuf_clear_free(in_decrypted);
1349
1350 return res;
1351 }
1352
1353
eap_fast_get_a_id(const u8 * buf,size_t len,size_t * id_len)1354 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1355 {
1356 const u8 *a_id;
1357 const struct pac_tlv_hdr *hdr;
1358
1359 /*
1360 * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1361 * supports both raw A-ID and one inside an A-ID TLV.
1362 */
1363 a_id = buf;
1364 *id_len = len;
1365 if (len > sizeof(*hdr)) {
1366 int tlen;
1367 hdr = (const struct pac_tlv_hdr *) buf;
1368 tlen = be_to_host16(hdr->len);
1369 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1370 sizeof(*hdr) + tlen <= len) {
1371 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1372 "(Start)");
1373 a_id = (const u8 *) (hdr + 1);
1374 *id_len = tlen;
1375 }
1376 }
1377 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1378
1379 return a_id;
1380 }
1381
1382
eap_fast_select_pac(struct eap_fast_data * data,const u8 * a_id,size_t a_id_len)1383 static void eap_fast_select_pac(struct eap_fast_data *data,
1384 const u8 *a_id, size_t a_id_len)
1385 {
1386 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1387 PAC_TYPE_TUNNEL_PAC);
1388 if (data->current_pac == NULL) {
1389 /*
1390 * Tunnel PAC was not available for this A-ID. Try to use
1391 * Machine Authentication PAC, if one is available.
1392 */
1393 data->current_pac = eap_fast_get_pac(
1394 data->pac, a_id, a_id_len,
1395 PAC_TYPE_MACHINE_AUTHENTICATION);
1396 }
1397
1398 if (data->current_pac) {
1399 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1400 "(PAC-Type %d)", data->current_pac->pac_type);
1401 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1402 data->current_pac->a_id_info,
1403 data->current_pac->a_id_info_len);
1404 }
1405 }
1406
1407
eap_fast_use_pac_opaque(struct eap_sm * sm,struct eap_fast_data * data,struct eap_fast_pac * pac)1408 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1409 struct eap_fast_data *data,
1410 struct eap_fast_pac *pac)
1411 {
1412 u8 *tlv;
1413 size_t tlv_len, olen;
1414 struct eap_tlv_hdr *ehdr;
1415
1416 olen = pac->pac_opaque_len;
1417 tlv_len = sizeof(*ehdr) + olen;
1418 tlv = os_malloc(tlv_len);
1419 if (tlv) {
1420 ehdr = (struct eap_tlv_hdr *) tlv;
1421 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1422 ehdr->length = host_to_be16(olen);
1423 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1424 }
1425 if (tlv == NULL ||
1426 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1427 TLS_EXT_PAC_OPAQUE,
1428 tlv, tlv_len) < 0) {
1429 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1430 "extension");
1431 os_free(tlv);
1432 return -1;
1433 }
1434 os_free(tlv);
1435
1436 return 0;
1437 }
1438
1439
eap_fast_clear_pac_opaque_ext(struct eap_sm * sm,struct eap_fast_data * data)1440 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1441 struct eap_fast_data *data)
1442 {
1443 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1444 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1445 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1446 "TLS extension");
1447 return -1;
1448 }
1449 return 0;
1450 }
1451
1452
eap_fast_set_provisioning_ciphers(struct eap_sm * sm,struct eap_fast_data * data)1453 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1454 struct eap_fast_data *data)
1455 {
1456 u8 ciphers[7];
1457 int count = 0;
1458
1459 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1460 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1461 "provisioning TLS cipher suites");
1462 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1463 }
1464
1465 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1466 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1467 "provisioning TLS cipher suites");
1468 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA;
1469 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1470 ciphers[count++] = TLS_CIPHER_AES256_SHA;
1471 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1472 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1473 }
1474
1475 ciphers[count++] = TLS_CIPHER_NONE;
1476
1477 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1478 ciphers)) {
1479 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1480 "cipher suites for provisioning");
1481 return -1;
1482 }
1483
1484 return 0;
1485 }
1486
1487
eap_fast_process_start(struct eap_sm * sm,struct eap_fast_data * data,u8 flags,const u8 * pos,size_t left)1488 static int eap_fast_process_start(struct eap_sm *sm,
1489 struct eap_fast_data *data, u8 flags,
1490 const u8 *pos, size_t left)
1491 {
1492 const u8 *a_id;
1493 size_t a_id_len;
1494
1495 /* EAP-FAST Version negotiation (section 3.1) */
1496 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1497 flags & EAP_TLS_VERSION_MASK, data->fast_version);
1498 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1499 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1500 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1501 data->fast_version);
1502
1503 a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1504 eap_fast_select_pac(data, a_id, a_id_len);
1505
1506 if (data->resuming && data->current_pac) {
1507 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1508 "do not add PAC-Opaque to TLS ClientHello");
1509 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1510 return -1;
1511 } else if (data->current_pac) {
1512 /*
1513 * PAC found for the A-ID and we are not resuming an old
1514 * session, so add PAC-Opaque extension to ClientHello.
1515 */
1516 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1517 return -1;
1518 } else {
1519 /* No PAC found, so we must provision one. */
1520 if (!data->provisioning_allowed) {
1521 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1522 "provisioning disabled");
1523 return -1;
1524 }
1525 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1526 "starting provisioning");
1527 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1528 eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1529 return -1;
1530 data->provisioning = 1;
1531 }
1532
1533 return 0;
1534 }
1535
1536
eap_fast_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1537 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1538 struct eap_method_ret *ret,
1539 const struct wpabuf *reqData)
1540 {
1541 const struct eap_hdr *req;
1542 size_t left;
1543 int res;
1544 u8 flags, id;
1545 struct wpabuf *resp;
1546 const u8 *pos;
1547 struct eap_fast_data *data = priv;
1548 struct wpabuf msg;
1549
1550 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1551 reqData, &left, &flags);
1552 if (pos == NULL)
1553 return NULL;
1554
1555 req = wpabuf_head(reqData);
1556 id = req->identifier;
1557
1558 if (flags & EAP_TLS_FLAGS_START) {
1559 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1560 return NULL;
1561
1562 left = 0; /* A-ID is not used in further packet processing */
1563 }
1564
1565 wpabuf_set(&msg, pos, left);
1566
1567 resp = NULL;
1568 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1569 !data->resuming) {
1570 /* Process tunneled (encrypted) phase 2 data. */
1571 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
1572 if (res < 0) {
1573 ret->methodState = METHOD_DONE;
1574 ret->decision = DECISION_FAIL;
1575 /*
1576 * Ack possible Alert that may have caused failure in
1577 * decryption.
1578 */
1579 res = 1;
1580 }
1581 } else {
1582 if (sm->waiting_ext_cert_check && data->pending_resp) {
1583 struct eap_peer_config *config = eap_get_config(sm);
1584
1585 if (config->pending_ext_cert_check ==
1586 EXT_CERT_CHECK_GOOD) {
1587 wpa_printf(MSG_DEBUG,
1588 "EAP-FAST: External certificate check succeeded - continue handshake");
1589 resp = data->pending_resp;
1590 data->pending_resp = NULL;
1591 sm->waiting_ext_cert_check = 0;
1592 return resp;
1593 }
1594
1595 if (config->pending_ext_cert_check ==
1596 EXT_CERT_CHECK_BAD) {
1597 wpa_printf(MSG_DEBUG,
1598 "EAP-FAST: External certificate check failed - force authentication failure");
1599 ret->methodState = METHOD_DONE;
1600 ret->decision = DECISION_FAIL;
1601 sm->waiting_ext_cert_check = 0;
1602 return NULL;
1603 }
1604
1605 wpa_printf(MSG_DEBUG,
1606 "EAP-FAST: Continuing to wait external server certificate validation");
1607 return NULL;
1608 }
1609
1610 /* Continue processing TLS handshake (phase 1). */
1611 res = eap_peer_tls_process_helper(sm, &data->ssl,
1612 EAP_TYPE_FAST,
1613 data->fast_version, id, &msg,
1614 &resp);
1615 if (res < 0) {
1616 wpa_printf(MSG_DEBUG,
1617 "EAP-FAST: TLS processing failed");
1618 ret->methodState = METHOD_DONE;
1619 ret->decision = DECISION_FAIL;
1620 return resp;
1621 }
1622
1623 if (sm->waiting_ext_cert_check) {
1624 wpa_printf(MSG_DEBUG,
1625 "EAP-FAST: Waiting external server certificate validation");
1626 wpabuf_clear_free(data->pending_resp);
1627 data->pending_resp = resp;
1628 return NULL;
1629 }
1630
1631 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1632 char cipher[80];
1633 wpa_printf(MSG_DEBUG,
1634 "EAP-FAST: TLS done, proceed to Phase 2");
1635 if (data->provisioning &&
1636 (!(data->provisioning_allowed &
1637 EAP_FAST_PROV_AUTH) ||
1638 tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1639 cipher, sizeof(cipher)) < 0 ||
1640 os_strstr(cipher, "ADH-") ||
1641 os_strstr(cipher, "anon"))) {
1642 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1643 "anonymous (unauthenticated) "
1644 "provisioning");
1645 data->anon_provisioning = 1;
1646 } else
1647 data->anon_provisioning = 0;
1648 data->resuming = 0;
1649 if (eap_fast_derive_keys(sm, data) < 0) {
1650 wpa_printf(MSG_DEBUG,
1651 "EAP-FAST: Could not derive keys");
1652 ret->methodState = METHOD_DONE;
1653 ret->decision = DECISION_FAIL;
1654 wpabuf_clear_free(resp);
1655 return NULL;
1656 }
1657 }
1658
1659 if (res == 2) {
1660 /*
1661 * Application data included in the handshake message.
1662 */
1663 wpabuf_clear_free(data->pending_phase2_req);
1664 data->pending_phase2_req = resp;
1665 resp = NULL;
1666 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
1667 }
1668 }
1669
1670 if (res == 1) {
1671 wpabuf_clear_free(resp);
1672 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1673 data->fast_version);
1674 }
1675
1676 return resp;
1677 }
1678
1679
1680 #if 0 /* FIX */
1681 static bool eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1682 {
1683 struct eap_fast_data *data = priv;
1684 return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1685 }
1686
1687
1688 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1689 {
1690 struct eap_fast_data *data = priv;
1691
1692 if (data->phase2_priv && data->phase2_method &&
1693 data->phase2_method->deinit_for_reauth)
1694 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1695 os_free(data->key_block_p);
1696 data->key_block_p = NULL;
1697 wpabuf_clear_free(data->pending_phase2_req);
1698 data->pending_phase2_req = NULL;
1699 wpabuf_clear_free(data->pending_resp);
1700 data->pending_resp = NULL;
1701 }
1702
1703
1704 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1705 {
1706 struct eap_fast_data *data = priv;
1707 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1708 os_free(data);
1709 return NULL;
1710 }
1711 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
1712 os_memset(data->emsk, 0, EAP_EMSK_LEN);
1713 os_free(data->session_id);
1714 data->session_id = NULL;
1715 if (data->phase2_priv && data->phase2_method &&
1716 data->phase2_method->init_for_reauth)
1717 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1718 data->phase2_success = 0;
1719 data->resuming = 1;
1720 data->provisioning = 0;
1721 data->anon_provisioning = 0;
1722 data->simck_idx = 0;
1723 return priv;
1724 }
1725 #endif
1726
1727
eap_fast_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1728 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1729 size_t buflen, int verbose)
1730 {
1731 struct eap_fast_data *data = priv;
1732 int len, ret;
1733
1734 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1735 if (data->phase2_method) {
1736 ret = os_snprintf(buf + len, buflen - len,
1737 "EAP-FAST Phase2 method=%s\n",
1738 data->phase2_method->name);
1739 if (os_snprintf_error(buflen - len, ret))
1740 return len;
1741 len += ret;
1742 }
1743 return len;
1744 }
1745
1746
eap_fast_isKeyAvailable(struct eap_sm * sm,void * priv)1747 static bool eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1748 {
1749 struct eap_fast_data *data = priv;
1750 return data->success;
1751 }
1752
1753
eap_fast_getKey(struct eap_sm * sm,void * priv,size_t * len)1754 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1755 {
1756 struct eap_fast_data *data = priv;
1757 u8 *key;
1758
1759 if (!data->success)
1760 return NULL;
1761
1762 key = os_memdup(data->key_data, EAP_FAST_KEY_LEN);
1763 if (key == NULL)
1764 return NULL;
1765
1766 *len = EAP_FAST_KEY_LEN;
1767
1768 return key;
1769 }
1770
1771
eap_fast_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1772 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1773 {
1774 struct eap_fast_data *data = priv;
1775 u8 *id;
1776
1777 if (!data->success || !data->session_id)
1778 return NULL;
1779
1780 id = os_memdup(data->session_id, data->id_len);
1781 if (id == NULL)
1782 return NULL;
1783
1784 *len = data->id_len;
1785
1786 return id;
1787 }
1788
1789
eap_fast_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1790 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1791 {
1792 struct eap_fast_data *data = priv;
1793 u8 *key;
1794
1795 if (!data->success)
1796 return NULL;
1797
1798 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1799 if (key == NULL)
1800 return NULL;
1801
1802 *len = EAP_EMSK_LEN;
1803
1804 return key;
1805 }
1806
1807
eap_peer_fast_register(void)1808 int eap_peer_fast_register(void)
1809 {
1810 struct eap_method *eap;
1811
1812 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1813 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1814 if (eap == NULL)
1815 return -1;
1816
1817 eap->init = eap_fast_init;
1818 eap->deinit = eap_fast_deinit;
1819 eap->process = eap_fast_process;
1820 eap->isKeyAvailable = eap_fast_isKeyAvailable;
1821 eap->getKey = eap_fast_getKey;
1822 eap->getSessionId = eap_fast_get_session_id;
1823 eap->get_status = eap_fast_get_status;
1824 #if 0
1825 eap->has_reauth_data = eap_fast_has_reauth_data;
1826 eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1827 eap->init_for_reauth = eap_fast_init_for_reauth;
1828 #endif
1829 eap->get_emsk = eap_fast_get_emsk;
1830
1831 return eap_peer_method_register(eap);
1832 }
1833