1/*
2 * EAP-FAST server (RFC 4851)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "crypto/aes_wrap.h"
13#include "crypto/sha1.h"
14#include "crypto/tls.h"
15#include "crypto/random.h"
16#include "eap_common/eap_tlv_common.h"
17#include "eap_common/eap_fast_common.h"
18#include "eap_i.h"
19#include "eap_tls_common.h"
20
21
22static void eap_fast_reset(struct eap_sm *sm, void *priv);
23
24
25/* Private PAC-Opaque TLV types */
26#define PAC_OPAQUE_TYPE_PAD 0
27#define PAC_OPAQUE_TYPE_KEY 1
28#define PAC_OPAQUE_TYPE_LIFETIME 2
29#define PAC_OPAQUE_TYPE_IDENTITY 3
30
31struct eap_fast_data {
32	struct eap_ssl_data ssl;
33	enum {
34		START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
35		CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
36	} state;
37
38	int fast_version;
39	const struct eap_method *phase2_method;
40	void *phase2_priv;
41	int force_version;
42	int peer_version;
43
44	u8 crypto_binding_nonce[32];
45	int final_result;
46
47	struct eap_fast_key_block_provisioning *key_block_p;
48
49	u8 simck[EAP_FAST_SIMCK_LEN];
50	u8 cmk[EAP_FAST_CMK_LEN];
51	int simck_idx;
52
53	u8 pac_opaque_encr[16];
54	u8 *srv_id;
55	size_t srv_id_len;
56	char *srv_id_info;
57
58	int anon_provisioning;
59	int send_new_pac; /* server triggered re-keying of Tunnel PAC */
60	struct wpabuf *pending_phase2_resp;
61	u8 *identity; /* from PAC-Opaque */
62	size_t identity_len;
63	int eap_seq;
64	int tnc_started;
65
66	int pac_key_lifetime;
67	int pac_key_refresh_time;
68};
69
70
71static int eap_fast_process_phase2_start(struct eap_sm *sm,
72					 struct eap_fast_data *data);
73
74
75static const char * eap_fast_state_txt(int state)
76{
77	switch (state) {
78	case START:
79		return "START";
80	case PHASE1:
81		return "PHASE1";
82	case PHASE2_START:
83		return "PHASE2_START";
84	case PHASE2_ID:
85		return "PHASE2_ID";
86	case PHASE2_METHOD:
87		return "PHASE2_METHOD";
88	case CRYPTO_BINDING:
89		return "CRYPTO_BINDING";
90	case REQUEST_PAC:
91		return "REQUEST_PAC";
92	case SUCCESS:
93		return "SUCCESS";
94	case FAILURE:
95		return "FAILURE";
96	default:
97		return "Unknown?!";
98	}
99}
100
101
102static void eap_fast_state(struct eap_fast_data *data, int state)
103{
104	wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105		   eap_fast_state_txt(data->state),
106		   eap_fast_state_txt(state));
107	data->state = state;
108}
109
110
111static EapType eap_fast_req_failure(struct eap_sm *sm,
112				    struct eap_fast_data *data)
113{
114	/* TODO: send Result TLV(FAILURE) */
115	eap_fast_state(data, FAILURE);
116	return EAP_TYPE_NONE;
117}
118
119
120static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
121				      const u8 *client_random,
122				      const u8 *server_random,
123				      u8 *master_secret)
124{
125	struct eap_fast_data *data = ctx;
126	const u8 *pac_opaque;
127	size_t pac_opaque_len;
128	u8 *buf, *pos, *end, *pac_key = NULL;
129	os_time_t lifetime = 0;
130	struct os_time now;
131	u8 *identity = NULL;
132	size_t identity_len = 0;
133
134	wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135	wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136		    ticket, len);
137
138	if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139		wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140			   "SessionTicket");
141		return 0;
142	}
143
144	pac_opaque_len = WPA_GET_BE16(ticket + 2);
145	pac_opaque = ticket + 4;
146	if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147	    pac_opaque_len > len - 4) {
148		wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
149			   "(len=%lu left=%lu)",
150			   (unsigned long) pac_opaque_len,
151			   (unsigned long) len);
152		return 0;
153	}
154	wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155		    pac_opaque, pac_opaque_len);
156
157	buf = os_malloc(pac_opaque_len - 8);
158	if (buf == NULL) {
159		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
160			   "for decrypting PAC-Opaque");
161		return 0;
162	}
163
164	if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
165		       pac_opaque, buf) < 0) {
166		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167			   "PAC-Opaque");
168		os_free(buf);
169		/*
170		 * This may have been caused by server changing the PAC-Opaque
171		 * encryption key, so just ignore this PAC-Opaque instead of
172		 * failing the authentication completely. Provisioning can now
173		 * be used to provision a new PAC.
174		 */
175		return 0;
176	}
177
178	end = buf + pac_opaque_len - 8;
179	wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180			buf, end - buf);
181
182	pos = buf;
183	while (pos + 1 < end) {
184		if (pos + 2 + pos[1] > end)
185			break;
186
187		switch (*pos) {
188		case PAC_OPAQUE_TYPE_PAD:
189			pos = end;
190			break;
191		case PAC_OPAQUE_TYPE_KEY:
192			if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
193				wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
194					   "PAC-Key length %d", pos[1]);
195				os_free(buf);
196				return -1;
197			}
198			pac_key = pos + 2;
199			wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
200					"decrypted PAC-Opaque",
201					pac_key, EAP_FAST_PAC_KEY_LEN);
202			break;
203		case PAC_OPAQUE_TYPE_LIFETIME:
204			if (pos[1] != 4) {
205				wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
206					   "PAC-Key lifetime length %d",
207					   pos[1]);
208				os_free(buf);
209				return -1;
210			}
211			lifetime = WPA_GET_BE32(pos + 2);
212			break;
213		case PAC_OPAQUE_TYPE_IDENTITY:
214			identity = pos + 2;
215			identity_len = pos[1];
216			break;
217		}
218
219		pos += 2 + pos[1];
220	}
221
222	if (pac_key == NULL) {
223		wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
224			   "PAC-Opaque");
225		os_free(buf);
226		return -1;
227	}
228
229	if (identity) {
230		wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
231				  "PAC-Opaque", identity, identity_len);
232		os_free(data->identity);
233		data->identity = os_malloc(identity_len);
234		if (data->identity) {
235			os_memcpy(data->identity, identity, identity_len);
236			data->identity_len = identity_len;
237		}
238	}
239
240	if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
241		wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
242			   "(lifetime=%ld now=%ld)", lifetime, now.sec);
243		data->send_new_pac = 2;
244		/*
245		 * Allow PAC to be used to allow a PAC update with some level
246		 * of server authentication (i.e., do not fall back to full TLS
247		 * handshake since we cannot be sure that the peer would be
248		 * able to validate server certificate now). However, reject
249		 * the authentication since the PAC was not valid anymore. Peer
250		 * can connect again with the newly provisioned PAC after this.
251		 */
252	} else if (lifetime - now.sec < data->pac_key_refresh_time) {
253		wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
254			   "an update if authentication succeeds");
255		data->send_new_pac = 1;
256	}
257
258	eap_fast_derive_master_secret(pac_key, server_random, client_random,
259				      master_secret);
260
261	os_free(buf);
262
263	return 1;
264}
265
266
267static void eap_fast_derive_key_auth(struct eap_sm *sm,
268				     struct eap_fast_data *data)
269{
270	u8 *sks;
271
272	/* RFC 4851, Section 5.1:
273	 * Extra key material after TLS key_block: session_key_seed[40]
274	 */
275
276	sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
277				  EAP_FAST_SKS_LEN);
278	if (sks == NULL) {
279		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
280			   "session_key_seed");
281		return;
282	}
283
284	/*
285	 * RFC 4851, Section 5.2:
286	 * S-IMCK[0] = session_key_seed
287	 */
288	wpa_hexdump_key(MSG_DEBUG,
289			"EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
290			sks, EAP_FAST_SKS_LEN);
291	data->simck_idx = 0;
292	os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
293	os_free(sks);
294}
295
296
297static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
298					     struct eap_fast_data *data)
299{
300	os_free(data->key_block_p);
301	data->key_block_p = (struct eap_fast_key_block_provisioning *)
302		eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
303				    "key expansion",
304				    sizeof(*data->key_block_p));
305	if (data->key_block_p == NULL) {
306		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
307		return;
308	}
309	/*
310	 * RFC 4851, Section 5.2:
311	 * S-IMCK[0] = session_key_seed
312	 */
313	wpa_hexdump_key(MSG_DEBUG,
314			"EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
315			data->key_block_p->session_key_seed,
316			sizeof(data->key_block_p->session_key_seed));
317	data->simck_idx = 0;
318	os_memcpy(data->simck, data->key_block_p->session_key_seed,
319		  EAP_FAST_SIMCK_LEN);
320	wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
321			data->key_block_p->server_challenge,
322			sizeof(data->key_block_p->server_challenge));
323	wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
324			data->key_block_p->client_challenge,
325			sizeof(data->key_block_p->client_challenge));
326}
327
328
329static int eap_fast_get_phase2_key(struct eap_sm *sm,
330				   struct eap_fast_data *data,
331				   u8 *isk, size_t isk_len)
332{
333	u8 *key;
334	size_t key_len;
335
336	os_memset(isk, 0, isk_len);
337
338	if (data->phase2_method == NULL || data->phase2_priv == NULL) {
339		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
340			   "available");
341		return -1;
342	}
343
344	if (data->phase2_method->getKey == NULL)
345		return 0;
346
347	if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
348					       &key_len)) == NULL) {
349		wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
350			   "from Phase 2");
351		return -1;
352	}
353
354	if (key_len > isk_len)
355		key_len = isk_len;
356	if (key_len == 32 &&
357	    data->phase2_method->vendor == EAP_VENDOR_IETF &&
358	    data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
359		/*
360		 * EAP-FAST uses reverse order for MS-MPPE keys when deriving
361		 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
362		 * ISK for EAP-FAST cryptobinding.
363		 */
364		os_memcpy(isk, key + 16, 16);
365		os_memcpy(isk + 16, key, 16);
366	} else
367		os_memcpy(isk, key, key_len);
368	os_free(key);
369
370	return 0;
371}
372
373
374static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
375{
376	u8 isk[32], imck[60];
377
378	wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
379		   data->simck_idx + 1);
380
381	/*
382	 * RFC 4851, Section 5.2:
383	 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
384	 *                 MSK[j], 60)
385	 * S-IMCK[j] = first 40 octets of IMCK[j]
386	 * CMK[j] = last 20 octets of IMCK[j]
387	 */
388
389	if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
390		return -1;
391	wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
392	sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
393		   "Inner Methods Compound Keys",
394		   isk, sizeof(isk), imck, sizeof(imck));
395	data->simck_idx++;
396	os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
397	wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
398			data->simck, EAP_FAST_SIMCK_LEN);
399	os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
400	wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
401			data->cmk, EAP_FAST_CMK_LEN);
402
403	return 0;
404}
405
406
407static void * eap_fast_init(struct eap_sm *sm)
408{
409	struct eap_fast_data *data;
410	u8 ciphers[5] = {
411		TLS_CIPHER_ANON_DH_AES128_SHA,
412		TLS_CIPHER_AES128_SHA,
413		TLS_CIPHER_RSA_DHE_AES128_SHA,
414		TLS_CIPHER_RC4_SHA,
415		TLS_CIPHER_NONE
416	};
417
418	data = os_zalloc(sizeof(*data));
419	if (data == NULL)
420		return NULL;
421	data->fast_version = EAP_FAST_VERSION;
422	data->force_version = -1;
423	if (sm->user && sm->user->force_version >= 0) {
424		data->force_version = sm->user->force_version;
425		wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
426			   data->force_version);
427		data->fast_version = data->force_version;
428	}
429	data->state = START;
430
431	if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
432		wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
433		eap_fast_reset(sm, data);
434		return NULL;
435	}
436
437	if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
438					   ciphers) < 0) {
439		wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
440			   "suites");
441		eap_fast_reset(sm, data);
442		return NULL;
443	}
444
445	if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
446						 eap_fast_session_ticket_cb,
447						 data) < 0) {
448		wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
449			   "callback");
450		eap_fast_reset(sm, data);
451		return NULL;
452	}
453
454	if (sm->pac_opaque_encr_key == NULL) {
455		wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
456			   "configured");
457		eap_fast_reset(sm, data);
458		return NULL;
459	}
460	os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
461		  sizeof(data->pac_opaque_encr));
462
463	if (sm->eap_fast_a_id == NULL) {
464		wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
465		eap_fast_reset(sm, data);
466		return NULL;
467	}
468	data->srv_id = os_malloc(sm->eap_fast_a_id_len);
469	if (data->srv_id == NULL) {
470		eap_fast_reset(sm, data);
471		return NULL;
472	}
473	os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
474	data->srv_id_len = sm->eap_fast_a_id_len;
475
476	if (sm->eap_fast_a_id_info == NULL) {
477		wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
478		eap_fast_reset(sm, data);
479		return NULL;
480	}
481	data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
482	if (data->srv_id_info == NULL) {
483		eap_fast_reset(sm, data);
484		return NULL;
485	}
486
487	/* PAC-Key lifetime in seconds (hard limit) */
488	data->pac_key_lifetime = sm->pac_key_lifetime;
489
490	/*
491	 * PAC-Key refresh time in seconds (soft limit on remaining hard
492	 * limit). The server will generate a new PAC-Key when this number of
493	 * seconds (or fewer) of the lifetime remains.
494	 */
495	data->pac_key_refresh_time = sm->pac_key_refresh_time;
496
497	return data;
498}
499
500
501static void eap_fast_reset(struct eap_sm *sm, void *priv)
502{
503	struct eap_fast_data *data = priv;
504	if (data == NULL)
505		return;
506	if (data->phase2_priv && data->phase2_method)
507		data->phase2_method->reset(sm, data->phase2_priv);
508	eap_server_tls_ssl_deinit(sm, &data->ssl);
509	os_free(data->srv_id);
510	os_free(data->srv_id_info);
511	os_free(data->key_block_p);
512	wpabuf_free(data->pending_phase2_resp);
513	os_free(data->identity);
514	os_free(data);
515}
516
517
518static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
519					    struct eap_fast_data *data, u8 id)
520{
521	struct wpabuf *req;
522
523	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
524			    1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
525			    EAP_CODE_REQUEST, id);
526	if (req == NULL) {
527		wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
528			   " request");
529		eap_fast_state(data, FAILURE);
530		return NULL;
531	}
532
533	wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
534
535	/* RFC 4851, 4.1.1. Authority ID Data */
536	eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
537
538	eap_fast_state(data, PHASE1);
539
540	return req;
541}
542
543
544static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
545{
546	char cipher[64];
547
548	wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
549
550	if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
551	    < 0) {
552		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
553			   "information");
554		eap_fast_state(data, FAILURE);
555		return -1;
556	}
557	data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
558
559	if (data->anon_provisioning) {
560		wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
561		eap_fast_derive_key_provisioning(sm, data);
562	} else
563		eap_fast_derive_key_auth(sm, data);
564
565	eap_fast_state(data, PHASE2_START);
566
567	return 0;
568}
569
570
571static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
572						 struct eap_fast_data *data,
573						 u8 id)
574{
575	struct wpabuf *req;
576
577	if (data->phase2_priv == NULL) {
578		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
579			   "initialized");
580		return NULL;
581	}
582	req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
583	if (req == NULL)
584		return NULL;
585
586	wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
587	return eap_fast_tlv_eap_payload(req);
588}
589
590
591static struct wpabuf * eap_fast_build_crypto_binding(
592	struct eap_sm *sm, struct eap_fast_data *data)
593{
594	struct wpabuf *buf;
595	struct eap_tlv_result_tlv *result;
596	struct eap_tlv_crypto_binding_tlv *binding;
597
598	buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
599	if (buf == NULL)
600		return NULL;
601
602	if (data->send_new_pac || data->anon_provisioning ||
603	    data->phase2_method)
604		data->final_result = 0;
605	else
606		data->final_result = 1;
607
608	if (!data->final_result || data->eap_seq > 1) {
609		/* Intermediate-Result */
610		wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
611			   "(status=SUCCESS)");
612		result = wpabuf_put(buf, sizeof(*result));
613		result->tlv_type = host_to_be16(
614			EAP_TLV_TYPE_MANDATORY |
615			EAP_TLV_INTERMEDIATE_RESULT_TLV);
616		result->length = host_to_be16(2);
617		result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
618	}
619
620	if (data->final_result) {
621		/* Result TLV */
622		wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
623			   "(status=SUCCESS)");
624		result = wpabuf_put(buf, sizeof(*result));
625		result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
626						EAP_TLV_RESULT_TLV);
627		result->length = host_to_be16(2);
628		result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
629	}
630
631	/* Crypto-Binding TLV */
632	binding = wpabuf_put(buf, sizeof(*binding));
633	binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
634					 EAP_TLV_CRYPTO_BINDING_TLV);
635	binding->length = host_to_be16(sizeof(*binding) -
636				       sizeof(struct eap_tlv_hdr));
637	binding->version = EAP_FAST_VERSION;
638	binding->received_version = data->peer_version;
639	binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
640	if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
641		wpabuf_free(buf);
642		return NULL;
643	}
644
645	/*
646	 * RFC 4851, Section 4.2.8:
647	 * The nonce in a request MUST have its least significant bit set to 0.
648	 */
649	binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
650
651	os_memcpy(data->crypto_binding_nonce, binding->nonce,
652		  sizeof(binding->nonce));
653
654	/*
655	 * RFC 4851, Section 5.3:
656	 * CMK = CMK[j]
657	 * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
658	 */
659
660	hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
661		  (u8 *) binding, sizeof(*binding),
662		  binding->compound_mac);
663
664	wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
665		   "Received Version %d SubType %d",
666		   binding->version, binding->received_version,
667		   binding->subtype);
668	wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
669		    binding->nonce, sizeof(binding->nonce));
670	wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
671		    binding->compound_mac, sizeof(binding->compound_mac));
672
673	return buf;
674}
675
676
677static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
678					  struct eap_fast_data *data)
679{
680	u8 pac_key[EAP_FAST_PAC_KEY_LEN];
681	u8 *pac_buf, *pac_opaque;
682	struct wpabuf *buf;
683	u8 *pos;
684	size_t buf_len, srv_id_info_len, pac_len;
685	struct eap_tlv_hdr *pac_tlv;
686	struct pac_tlv_hdr *pac_info;
687	struct eap_tlv_result_tlv *result;
688	struct os_time now;
689
690	if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
691	    os_get_time(&now) < 0)
692		return NULL;
693	wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
694			pac_key, EAP_FAST_PAC_KEY_LEN);
695
696	pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
697		(2 + sm->identity_len) + 8;
698	pac_buf = os_malloc(pac_len);
699	if (pac_buf == NULL)
700		return NULL;
701
702	srv_id_info_len = os_strlen(data->srv_id_info);
703
704	pos = pac_buf;
705	*pos++ = PAC_OPAQUE_TYPE_KEY;
706	*pos++ = EAP_FAST_PAC_KEY_LEN;
707	os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
708	pos += EAP_FAST_PAC_KEY_LEN;
709
710	*pos++ = PAC_OPAQUE_TYPE_LIFETIME;
711	*pos++ = 4;
712	WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
713	pos += 4;
714
715	if (sm->identity) {
716		*pos++ = PAC_OPAQUE_TYPE_IDENTITY;
717		*pos++ = sm->identity_len;
718		os_memcpy(pos, sm->identity, sm->identity_len);
719		pos += sm->identity_len;
720	}
721
722	pac_len = pos - pac_buf;
723	while (pac_len % 8) {
724		*pos++ = PAC_OPAQUE_TYPE_PAD;
725		pac_len++;
726	}
727
728	pac_opaque = os_malloc(pac_len + 8);
729	if (pac_opaque == NULL) {
730		os_free(pac_buf);
731		return NULL;
732	}
733	if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
734		     pac_opaque) < 0) {
735		os_free(pac_buf);
736		os_free(pac_opaque);
737		return NULL;
738	}
739	os_free(pac_buf);
740
741	pac_len += 8;
742	wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
743		    pac_opaque, pac_len);
744
745	buf_len = sizeof(*pac_tlv) +
746		sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
747		sizeof(struct pac_tlv_hdr) + pac_len +
748		data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
749	buf = wpabuf_alloc(buf_len);
750	if (buf == NULL) {
751		os_free(pac_opaque);
752		return NULL;
753	}
754
755	/* Result TLV */
756	wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
757	result = wpabuf_put(buf, sizeof(*result));
758	WPA_PUT_BE16((u8 *) &result->tlv_type,
759		     EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
760	WPA_PUT_BE16((u8 *) &result->length, 2);
761	WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
762
763	/* PAC TLV */
764	wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
765	pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
766	pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
767					 EAP_TLV_PAC_TLV);
768
769	/* PAC-Key */
770	eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
771
772	/* PAC-Opaque */
773	eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
774	os_free(pac_opaque);
775
776	/* PAC-Info */
777	pac_info = wpabuf_put(buf, sizeof(*pac_info));
778	pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
779
780	/* PAC-Lifetime (inside PAC-Info) */
781	eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
782	wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
783
784	/* A-ID (inside PAC-Info) */
785	eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
786
787	/* Note: headers may be misaligned after A-ID */
788
789	if (sm->identity) {
790		eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
791				 sm->identity_len);
792	}
793
794	/* A-ID-Info (inside PAC-Info) */
795	eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
796			 srv_id_info_len);
797
798	/* PAC-Type (inside PAC-Info) */
799	eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
800	wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
801
802	/* Update PAC-Info and PAC TLV Length fields */
803	pos = wpabuf_put(buf, 0);
804	pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
805	pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
806
807	return buf;
808}
809
810
811static int eap_fast_encrypt_phase2(struct eap_sm *sm,
812				   struct eap_fast_data *data,
813				   struct wpabuf *plain, int piggyback)
814{
815	struct wpabuf *encr;
816
817	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
818			    plain);
819	encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
820	wpabuf_free(plain);
821
822	if (data->ssl.tls_out && piggyback) {
823		wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
824			   "(len=%d) with last Phase 1 Message (len=%d "
825			   "used=%d)",
826			   (int) wpabuf_len(encr),
827			   (int) wpabuf_len(data->ssl.tls_out),
828			   (int) data->ssl.tls_out_pos);
829		if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
830			wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
831				   "output buffer");
832			wpabuf_free(encr);
833			return -1;
834		}
835		wpabuf_put_buf(data->ssl.tls_out, encr);
836		wpabuf_free(encr);
837	} else {
838		wpabuf_free(data->ssl.tls_out);
839		data->ssl.tls_out_pos = 0;
840		data->ssl.tls_out = encr;
841	}
842
843	return 0;
844}
845
846
847static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
848{
849	struct eap_fast_data *data = priv;
850	struct wpabuf *req = NULL;
851	int piggyback = 0;
852
853	if (data->ssl.state == FRAG_ACK) {
854		return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
855						data->fast_version);
856	}
857
858	if (data->ssl.state == WAIT_FRAG_ACK) {
859		return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
860						data->fast_version, id);
861	}
862
863	switch (data->state) {
864	case START:
865		return eap_fast_build_start(sm, data, id);
866	case PHASE1:
867		if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
868			if (eap_fast_phase1_done(sm, data) < 0)
869				return NULL;
870			if (data->state == PHASE2_START) {
871				/*
872				 * Try to generate Phase 2 data to piggyback
873				 * with the end of Phase 1 to avoid extra
874				 * roundtrip.
875				 */
876				wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
877					   "Phase 2");
878				if (eap_fast_process_phase2_start(sm, data))
879					break;
880				req = eap_fast_build_phase2_req(sm, data, id);
881				piggyback = 1;
882			}
883		}
884		break;
885	case PHASE2_ID:
886	case PHASE2_METHOD:
887		req = eap_fast_build_phase2_req(sm, data, id);
888		break;
889	case CRYPTO_BINDING:
890		req = eap_fast_build_crypto_binding(sm, data);
891		if (data->phase2_method) {
892			/*
893			 * Include the start of the next EAP method in the
894			 * sequence in the same message with Crypto-Binding to
895			 * save a round-trip.
896			 */
897			struct wpabuf *eap;
898			eap = eap_fast_build_phase2_req(sm, data, id);
899			req = wpabuf_concat(req, eap);
900			eap_fast_state(data, PHASE2_METHOD);
901		}
902		break;
903	case REQUEST_PAC:
904		req = eap_fast_build_pac(sm, data);
905		break;
906	default:
907		wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
908			   __func__, data->state);
909		return NULL;
910	}
911
912	if (req &&
913	    eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
914		return NULL;
915
916	return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
917					data->fast_version, id);
918}
919
920
921static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
922			      struct wpabuf *respData)
923{
924	const u8 *pos;
925	size_t len;
926
927	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
928	if (pos == NULL || len < 1) {
929		wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
930		return TRUE;
931	}
932
933	return FALSE;
934}
935
936
937static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
938				EapType eap_type)
939{
940	if (data->phase2_priv && data->phase2_method) {
941		data->phase2_method->reset(sm, data->phase2_priv);
942		data->phase2_method = NULL;
943		data->phase2_priv = NULL;
944	}
945	data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
946							eap_type);
947	if (!data->phase2_method)
948		return -1;
949
950	if (data->key_block_p) {
951		sm->auth_challenge = data->key_block_p->server_challenge;
952		sm->peer_challenge = data->key_block_p->client_challenge;
953	}
954	sm->init_phase2 = 1;
955	data->phase2_priv = data->phase2_method->init(sm);
956	sm->init_phase2 = 0;
957	sm->auth_challenge = NULL;
958	sm->peer_challenge = NULL;
959
960	return data->phase2_priv == NULL ? -1 : 0;
961}
962
963
964static void eap_fast_process_phase2_response(struct eap_sm *sm,
965					     struct eap_fast_data *data,
966					     u8 *in_data, size_t in_len)
967{
968	u8 next_type = EAP_TYPE_NONE;
969	struct eap_hdr *hdr;
970	u8 *pos;
971	size_t left;
972	struct wpabuf buf;
973	const struct eap_method *m = data->phase2_method;
974	void *priv = data->phase2_priv;
975
976	if (priv == NULL) {
977		wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
978			   "initialized?!", __func__);
979		return;
980	}
981
982	hdr = (struct eap_hdr *) in_data;
983	pos = (u8 *) (hdr + 1);
984
985	if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
986		left = in_len - sizeof(*hdr);
987		wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
988			    "allowed types", pos + 1, left - 1);
989#ifdef EAP_SERVER_TNC
990		if (m && m->vendor == EAP_VENDOR_IETF &&
991		    m->method == EAP_TYPE_TNC) {
992			wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
993				   "TNC negotiation");
994			next_type = eap_fast_req_failure(sm, data);
995			eap_fast_phase2_init(sm, data, next_type);
996			return;
997		}
998#endif /* EAP_SERVER_TNC */
999		eap_sm_process_nak(sm, pos + 1, left - 1);
1000		if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1001		    sm->user->methods[sm->user_eap_method_index].method !=
1002		    EAP_TYPE_NONE) {
1003			next_type = sm->user->methods[
1004				sm->user_eap_method_index++].method;
1005			wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1006				   next_type);
1007		} else {
1008			next_type = eap_fast_req_failure(sm, data);
1009		}
1010		eap_fast_phase2_init(sm, data, next_type);
1011		return;
1012	}
1013
1014	wpabuf_set(&buf, in_data, in_len);
1015
1016	if (m->check(sm, priv, &buf)) {
1017		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1018			   "ignore the packet");
1019		next_type = eap_fast_req_failure(sm, data);
1020		return;
1021	}
1022
1023	m->process(sm, priv, &buf);
1024
1025	if (!m->isDone(sm, priv))
1026		return;
1027
1028	if (!m->isSuccess(sm, priv)) {
1029		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1030		next_type = eap_fast_req_failure(sm, data);
1031		eap_fast_phase2_init(sm, data, next_type);
1032		return;
1033	}
1034
1035	switch (data->state) {
1036	case PHASE2_ID:
1037		if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1038			wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1039					  "Identity not found in the user "
1040					  "database",
1041					  sm->identity, sm->identity_len);
1042			next_type = eap_fast_req_failure(sm, data);
1043			break;
1044		}
1045
1046		eap_fast_state(data, PHASE2_METHOD);
1047		if (data->anon_provisioning) {
1048			/*
1049			 * Only EAP-MSCHAPv2 is allowed for anonymous
1050			 * provisioning.
1051			 */
1052			next_type = EAP_TYPE_MSCHAPV2;
1053			sm->user_eap_method_index = 0;
1054		} else {
1055			next_type = sm->user->methods[0].method;
1056			sm->user_eap_method_index = 1;
1057		}
1058		wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1059		break;
1060	case PHASE2_METHOD:
1061	case CRYPTO_BINDING:
1062		eap_fast_update_icmk(sm, data);
1063		eap_fast_state(data, CRYPTO_BINDING);
1064		data->eap_seq++;
1065		next_type = EAP_TYPE_NONE;
1066#ifdef EAP_SERVER_TNC
1067		if (sm->tnc && !data->tnc_started) {
1068			wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1069			next_type = EAP_TYPE_TNC;
1070			data->tnc_started = 1;
1071		}
1072#endif /* EAP_SERVER_TNC */
1073		break;
1074	case FAILURE:
1075		break;
1076	default:
1077		wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1078			   __func__, data->state);
1079		break;
1080	}
1081
1082	eap_fast_phase2_init(sm, data, next_type);
1083}
1084
1085
1086static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1087					struct eap_fast_data *data,
1088					u8 *in_data, size_t in_len)
1089{
1090	struct eap_hdr *hdr;
1091	size_t len;
1092
1093	hdr = (struct eap_hdr *) in_data;
1094	if (in_len < (int) sizeof(*hdr)) {
1095		wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1096			   "EAP frame (len=%lu)", (unsigned long) in_len);
1097		eap_fast_req_failure(sm, data);
1098		return;
1099	}
1100	len = be_to_host16(hdr->length);
1101	if (len > in_len) {
1102		wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1103			   "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1104			   (unsigned long) in_len, (unsigned long) len);
1105		eap_fast_req_failure(sm, data);
1106		return;
1107	}
1108	wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1109		   "identifier=%d length=%lu", hdr->code, hdr->identifier,
1110		   (unsigned long) len);
1111	switch (hdr->code) {
1112	case EAP_CODE_RESPONSE:
1113		eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1114		break;
1115	default:
1116		wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1117			   "Phase 2 EAP header", hdr->code);
1118		break;
1119	}
1120}
1121
1122
1123static int eap_fast_parse_tlvs(struct wpabuf *data,
1124			       struct eap_fast_tlv_parse *tlv)
1125{
1126	int mandatory, tlv_type, len, res;
1127	u8 *pos, *end;
1128
1129	os_memset(tlv, 0, sizeof(*tlv));
1130
1131	pos = wpabuf_mhead(data);
1132	end = pos + wpabuf_len(data);
1133	while (pos + 4 < end) {
1134		mandatory = pos[0] & 0x80;
1135		tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1136		pos += 2;
1137		len = WPA_GET_BE16(pos);
1138		pos += 2;
1139		if (pos + len > end) {
1140			wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1141			return -1;
1142		}
1143		wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1144			   "TLV type %d length %d%s",
1145			   tlv_type, len, mandatory ? " (mandatory)" : "");
1146
1147		res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1148		if (res == -2)
1149			break;
1150		if (res < 0) {
1151			if (mandatory) {
1152				wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1153					   "mandatory TLV type %d", tlv_type);
1154				/* TODO: generate Nak TLV */
1155				break;
1156			} else {
1157				wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1158					   "unknown optional TLV type %d",
1159					   tlv_type);
1160			}
1161		}
1162
1163		pos += len;
1164	}
1165
1166	return 0;
1167}
1168
1169
1170static int eap_fast_validate_crypto_binding(
1171	struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1172	size_t bind_len)
1173{
1174	u8 cmac[SHA1_MAC_LEN];
1175
1176	wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1177		   "Version %d Received Version %d SubType %d",
1178		   b->version, b->received_version, b->subtype);
1179	wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1180		    b->nonce, sizeof(b->nonce));
1181	wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1182		    b->compound_mac, sizeof(b->compound_mac));
1183
1184	if (b->version != EAP_FAST_VERSION ||
1185	    b->received_version != EAP_FAST_VERSION) {
1186		wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1187			   "in Crypto-Binding: version %d "
1188			   "received_version %d", b->version,
1189			   b->received_version);
1190		return -1;
1191	}
1192
1193	if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1194		wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1195			   "Crypto-Binding: %d", b->subtype);
1196		return -1;
1197	}
1198
1199	if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1200	    (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1201		wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1202			   "Crypto-Binding");
1203		return -1;
1204	}
1205
1206	os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1207	os_memset(b->compound_mac, 0, sizeof(cmac));
1208	wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1209		    "Compound MAC calculation",
1210		    (u8 *) b, bind_len);
1211	hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1212		  b->compound_mac);
1213	if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1214		wpa_hexdump(MSG_MSGDUMP,
1215			    "EAP-FAST: Calculated Compound MAC",
1216			    b->compound_mac, sizeof(cmac));
1217		wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1218			   "match");
1219		return -1;
1220	}
1221
1222	return 0;
1223}
1224
1225
1226static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1227{
1228	struct eap_tlv_pac_type_tlv *tlv;
1229
1230	if (pac == NULL || len != sizeof(*tlv))
1231		return 0;
1232
1233	tlv = (struct eap_tlv_pac_type_tlv *) pac;
1234
1235	return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1236		be_to_host16(tlv->length) == 2 &&
1237		be_to_host16(tlv->pac_type) == type;
1238}
1239
1240
1241static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1242					 struct eap_fast_data *data,
1243					 struct wpabuf *in_data)
1244{
1245	struct eap_fast_tlv_parse tlv;
1246	int check_crypto_binding = data->state == CRYPTO_BINDING;
1247
1248	if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1249		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1250			   "Phase 2 TLVs");
1251		return;
1252	}
1253
1254	if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1255		wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1256			   "failure");
1257		eap_fast_state(data, FAILURE);
1258		return;
1259	}
1260
1261	if (data->state == REQUEST_PAC) {
1262		u16 type, len, res;
1263		if (tlv.pac == NULL || tlv.pac_len < 6) {
1264			wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1265				   "Acknowledgement received");
1266			eap_fast_state(data, FAILURE);
1267			return;
1268		}
1269
1270		type = WPA_GET_BE16(tlv.pac);
1271		len = WPA_GET_BE16(tlv.pac + 2);
1272		res = WPA_GET_BE16(tlv.pac + 4);
1273
1274		if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1275		    res != EAP_TLV_RESULT_SUCCESS) {
1276			wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1277				   "contain acknowledgement");
1278			eap_fast_state(data, FAILURE);
1279			return;
1280		}
1281
1282		wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1283			   "- PAC provisioning succeeded");
1284		eap_fast_state(data, (data->anon_provisioning ||
1285				      data->send_new_pac == 2) ?
1286			       FAILURE : SUCCESS);
1287		return;
1288	}
1289
1290	if (check_crypto_binding) {
1291		if (tlv.crypto_binding == NULL) {
1292			wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1293				   "TLV received");
1294			eap_fast_state(data, FAILURE);
1295			return;
1296		}
1297
1298		if (data->final_result &&
1299		    tlv.result != EAP_TLV_RESULT_SUCCESS) {
1300			wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1301				   "without Success Result");
1302			eap_fast_state(data, FAILURE);
1303			return;
1304		}
1305
1306		if (!data->final_result &&
1307		    tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1308			wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1309				   "without intermediate Success Result");
1310			eap_fast_state(data, FAILURE);
1311			return;
1312		}
1313
1314		if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1315						     tlv.crypto_binding_len)) {
1316			eap_fast_state(data, FAILURE);
1317			return;
1318		}
1319
1320		wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1321			   "received");
1322		if (data->final_result) {
1323			wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1324				   "completed successfully");
1325		}
1326
1327		if (data->anon_provisioning &&
1328		    sm->eap_fast_prov != ANON_PROV &&
1329		    sm->eap_fast_prov != BOTH_PROV) {
1330			wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1331				   "use unauthenticated provisioning which is "
1332				   "disabled");
1333			eap_fast_state(data, FAILURE);
1334			return;
1335		}
1336
1337		if (sm->eap_fast_prov != AUTH_PROV &&
1338		    sm->eap_fast_prov != BOTH_PROV &&
1339		    tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1340		    eap_fast_pac_type(tlv.pac, tlv.pac_len,
1341				      PAC_TYPE_TUNNEL_PAC)) {
1342			wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1343				   "use authenticated provisioning which is "
1344				   "disabled");
1345			eap_fast_state(data, FAILURE);
1346			return;
1347		}
1348
1349		if (data->anon_provisioning ||
1350		    (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1351		     eap_fast_pac_type(tlv.pac, tlv.pac_len,
1352				       PAC_TYPE_TUNNEL_PAC))) {
1353			wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1354				   "Tunnel PAC");
1355			eap_fast_state(data, REQUEST_PAC);
1356		} else if (data->send_new_pac) {
1357			wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1358				   "re-keying of Tunnel PAC");
1359			eap_fast_state(data, REQUEST_PAC);
1360		} else if (data->final_result)
1361			eap_fast_state(data, SUCCESS);
1362	}
1363
1364	if (tlv.eap_payload_tlv) {
1365		eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1366					    tlv.eap_payload_tlv_len);
1367	}
1368}
1369
1370
1371static void eap_fast_process_phase2(struct eap_sm *sm,
1372				    struct eap_fast_data *data,
1373				    struct wpabuf *in_buf)
1374{
1375	struct wpabuf *in_decrypted;
1376
1377	wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1378		   " Phase 2", (unsigned long) wpabuf_len(in_buf));
1379
1380	if (data->pending_phase2_resp) {
1381		wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1382			   "skip decryption and use old data");
1383		eap_fast_process_phase2_tlvs(sm, data,
1384					     data->pending_phase2_resp);
1385		wpabuf_free(data->pending_phase2_resp);
1386		data->pending_phase2_resp = NULL;
1387		return;
1388	}
1389
1390	in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1391					      in_buf);
1392	if (in_decrypted == NULL) {
1393		wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1394			   "data");
1395		eap_fast_state(data, FAILURE);
1396		return;
1397	}
1398
1399	wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1400			    in_decrypted);
1401
1402	eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1403
1404	if (sm->method_pending == METHOD_PENDING_WAIT) {
1405		wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1406			   "pending wait state - save decrypted response");
1407		wpabuf_free(data->pending_phase2_resp);
1408		data->pending_phase2_resp = in_decrypted;
1409		return;
1410	}
1411
1412	wpabuf_free(in_decrypted);
1413}
1414
1415
1416static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1417				    int peer_version)
1418{
1419	struct eap_fast_data *data = priv;
1420
1421	data->peer_version = peer_version;
1422
1423	if (data->force_version >= 0 && peer_version != data->force_version) {
1424		wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1425			   " version (forced=%d peer=%d) - reject",
1426			   data->force_version, peer_version);
1427		return -1;
1428	}
1429
1430	if (peer_version < data->fast_version) {
1431		wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1432			   "use version %d",
1433			   peer_version, data->fast_version, peer_version);
1434		data->fast_version = peer_version;
1435	}
1436
1437	return 0;
1438}
1439
1440
1441static int eap_fast_process_phase1(struct eap_sm *sm,
1442				   struct eap_fast_data *data)
1443{
1444	if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1445		wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1446		eap_fast_state(data, FAILURE);
1447		return -1;
1448	}
1449
1450	if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1451	    wpabuf_len(data->ssl.tls_out) > 0)
1452		return 1;
1453
1454	/*
1455	 * Phase 1 was completed with the received message (e.g., when using
1456	 * abbreviated handshake), so Phase 2 can be started immediately
1457	 * without having to send through an empty message to the peer.
1458	 */
1459
1460	return eap_fast_phase1_done(sm, data);
1461}
1462
1463
1464static int eap_fast_process_phase2_start(struct eap_sm *sm,
1465					 struct eap_fast_data *data)
1466{
1467	u8 next_type;
1468
1469	if (data->identity) {
1470		os_free(sm->identity);
1471		sm->identity = data->identity;
1472		data->identity = NULL;
1473		sm->identity_len = data->identity_len;
1474		data->identity_len = 0;
1475		sm->require_identity_match = 1;
1476		if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1477			wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1478					  "Phase2 Identity not found "
1479					  "in the user database",
1480					  sm->identity, sm->identity_len);
1481			next_type = eap_fast_req_failure(sm, data);
1482		} else {
1483			wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1484				   "known - skip Phase 2 Identity Request");
1485			next_type = sm->user->methods[0].method;
1486			sm->user_eap_method_index = 1;
1487		}
1488
1489		eap_fast_state(data, PHASE2_METHOD);
1490	} else {
1491		eap_fast_state(data, PHASE2_ID);
1492		next_type = EAP_TYPE_IDENTITY;
1493	}
1494
1495	return eap_fast_phase2_init(sm, data, next_type);
1496}
1497
1498
1499static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1500				 const struct wpabuf *respData)
1501{
1502	struct eap_fast_data *data = priv;
1503
1504	switch (data->state) {
1505	case PHASE1:
1506		if (eap_fast_process_phase1(sm, data))
1507			break;
1508
1509		/* fall through to PHASE2_START */
1510	case PHASE2_START:
1511		eap_fast_process_phase2_start(sm, data);
1512		break;
1513	case PHASE2_ID:
1514	case PHASE2_METHOD:
1515	case CRYPTO_BINDING:
1516	case REQUEST_PAC:
1517		eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1518		break;
1519	default:
1520		wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1521			   data->state, __func__);
1522		break;
1523	}
1524}
1525
1526
1527static void eap_fast_process(struct eap_sm *sm, void *priv,
1528			     struct wpabuf *respData)
1529{
1530	struct eap_fast_data *data = priv;
1531	if (eap_server_tls_process(sm, &data->ssl, respData, data,
1532				   EAP_TYPE_FAST, eap_fast_process_version,
1533				   eap_fast_process_msg) < 0)
1534		eap_fast_state(data, FAILURE);
1535}
1536
1537
1538static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1539{
1540	struct eap_fast_data *data = priv;
1541	return data->state == SUCCESS || data->state == FAILURE;
1542}
1543
1544
1545static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1546{
1547	struct eap_fast_data *data = priv;
1548	u8 *eapKeyData;
1549
1550	if (data->state != SUCCESS)
1551		return NULL;
1552
1553	eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1554	if (eapKeyData == NULL)
1555		return NULL;
1556
1557	eap_fast_derive_eap_msk(data->simck, eapKeyData);
1558	*len = EAP_FAST_KEY_LEN;
1559
1560	return eapKeyData;
1561}
1562
1563
1564static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1565{
1566	struct eap_fast_data *data = priv;
1567	u8 *eapKeyData;
1568
1569	if (data->state != SUCCESS)
1570		return NULL;
1571
1572	eapKeyData = os_malloc(EAP_EMSK_LEN);
1573	if (eapKeyData == NULL)
1574		return NULL;
1575
1576	eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1577	*len = EAP_EMSK_LEN;
1578
1579	return eapKeyData;
1580}
1581
1582
1583static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1584{
1585	struct eap_fast_data *data = priv;
1586	return data->state == SUCCESS;
1587}
1588
1589
1590int eap_server_fast_register(void)
1591{
1592	struct eap_method *eap;
1593	int ret;
1594
1595	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1596				      EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1597	if (eap == NULL)
1598		return -1;
1599
1600	eap->init = eap_fast_init;
1601	eap->reset = eap_fast_reset;
1602	eap->buildReq = eap_fast_buildReq;
1603	eap->check = eap_fast_check;
1604	eap->process = eap_fast_process;
1605	eap->isDone = eap_fast_isDone;
1606	eap->getKey = eap_fast_getKey;
1607	eap->get_emsk = eap_fast_get_emsk;
1608	eap->isSuccess = eap_fast_isSuccess;
1609
1610	ret = eap_server_method_register(eap);
1611	if (ret)
1612		eap_server_method_free(eap);
1613	return ret;
1614}
1615