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