aboutsummaryrefslogtreecommitdiffstats
path: root/src/tls/tlsv1_client.c
blob: a147a54a3d10622dfad1dafadaf6f173b0f4d862 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
/*
 * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
 * Copyright (c) 2006-2019, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "x509v3.h"
#include "tlsv1_common.h"
#include "tlsv1_record.h"
#include "tlsv1_client.h"
#include "tlsv1_client_i.h"

/* TODO:
 * Support for a message fragmented across several records (RFC 2246, 6.2.1)
 */


void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
{
	conn->alert_level = level;
	conn->alert_description = description;
}


void tlsv1_client_free_dh(struct tlsv1_client *conn)
{
	os_free(conn->dh_p);
	os_free(conn->dh_g);
	os_free(conn->dh_ys);
	conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
}


int tls_derive_pre_master_secret(u8 *pre_master_secret)
{
	WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
	if (os_get_random(pre_master_secret + 2,
			  TLS_PRE_MASTER_SECRET_LEN - 2))
		return -1;
	return 0;
}


int tls_derive_keys(struct tlsv1_client *conn,
		    const u8 *pre_master_secret, size_t pre_master_secret_len)
{
	u8 seed[2 * TLS_RANDOM_LEN];
	u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
	u8 *pos;
	size_t key_block_len;

	if (pre_master_secret) {
		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
				pre_master_secret, pre_master_secret_len);
		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
			  TLS_RANDOM_LEN);
		if (tls_prf(conn->rl.tls_version,
			    pre_master_secret, pre_master_secret_len,
			    "master secret", seed, 2 * TLS_RANDOM_LEN,
			    conn->master_secret, TLS_MASTER_SECRET_LEN)) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
				   "master_secret");
			return -1;
		}
		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
				conn->master_secret, TLS_MASTER_SECRET_LEN);
	}

	os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
	os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
	key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
	if (conn->rl.tls_version == TLS_VERSION_1)
		key_block_len += 2 * conn->rl.iv_size;
	if (tls_prf(conn->rl.tls_version,
		    conn->master_secret, TLS_MASTER_SECRET_LEN,
		    "key expansion", seed, 2 * TLS_RANDOM_LEN,
		    key_block, key_block_len)) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
		return -1;
	}
	wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
			key_block, key_block_len);

	pos = key_block;

	/* client_write_MAC_secret */
	os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
	pos += conn->rl.hash_size;
	/* server_write_MAC_secret */
	os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
	pos += conn->rl.hash_size;

	/* client_write_key */
	os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
	pos += conn->rl.key_material_len;
	/* server_write_key */
	os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
	pos += conn->rl.key_material_len;

	if (conn->rl.tls_version == TLS_VERSION_1) {
		/* client_write_IV */
		os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
		pos += conn->rl.iv_size;
		/* server_write_IV */
		os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
	} else {
		/*
		 * Use IV field to set the mask value for TLS v1.1. A fixed
		 * mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
		 * Cipher option 2a.
		 */
		os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
	}

	return 0;
}


/**
 * tlsv1_client_handshake - Process TLS handshake
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Input data from TLS peer
 * @in_len: Input data length
 * @out_len: Length of the output buffer.
 * @appl_data: Pointer to application data pointer, or %NULL if dropped
 * @appl_data_len: Pointer to variable that is set to appl_data length
 * @need_more_data: Set to 1 if more data would be needed to complete
 *	processing
 * Returns: Pointer to output data, %NULL on failure
 */
u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
			    const u8 *in_data, size_t in_len,
			    size_t *out_len, u8 **appl_data,
			    size_t *appl_data_len, int *need_more_data)
{
	const u8 *pos, *end;
	u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
	size_t in_msg_len;
	int no_appl_data;
	int used;

	if (need_more_data)
		*need_more_data = 0;

	if (conn->state == CLIENT_HELLO) {
		if (in_len)
			return NULL;
		return tls_send_client_hello(conn, out_len);
	}

	if (conn->partial_input) {
		if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
				   "memory for pending record");
			tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
				  TLS_ALERT_INTERNAL_ERROR);
			goto failed;
		}
		wpabuf_put_data(conn->partial_input, in_data, in_len);
		in_data = wpabuf_head(conn->partial_input);
		in_len = wpabuf_len(conn->partial_input);
	}

	if (in_data == NULL || in_len == 0)
		return NULL;

	pos = in_data;
	end = in_data + in_len;
	in_msg = os_malloc(in_len);
	if (in_msg == NULL)
		return NULL;

	/* Each received packet may include multiple records */
	while (pos < end) {
		in_msg_len = in_len;
		used = tlsv1_record_receive(&conn->rl, pos, end - pos,
					    in_msg, &in_msg_len, &alert);
		if (used < 0) {
			wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
				   "record failed");
			tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
			goto failed;
		}
		if (used == 0) {
			struct wpabuf *partial;
			wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
			partial = wpabuf_alloc_copy(pos, end - pos);
			wpabuf_free(conn->partial_input);
			conn->partial_input = partial;
			if (conn->partial_input == NULL) {
				wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
					   "allocate memory for pending "
					   "record");
				tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
					  TLS_ALERT_INTERNAL_ERROR);
				goto failed;
			}
			os_free(in_msg);
			if (need_more_data)
				*need_more_data = 1;
			return NULL;
		}
		ct = pos[0];

		in_pos = in_msg;
		in_end = in_msg + in_msg_len;

		/* Each received record may include multiple messages of the
		 * same ContentType. */
		while (in_pos < in_end) {
			in_msg_len = in_end - in_pos;
			if (tlsv1_client_process_handshake(conn, ct, in_pos,
							   &in_msg_len,
							   appl_data,
							   appl_data_len) < 0)
				goto failed;
			in_pos += in_msg_len;
		}

		pos += used;
	}

	os_free(in_msg);
	in_msg = NULL;

	no_appl_data = appl_data == NULL || *appl_data == NULL;
	msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);

failed:
	os_free(in_msg);
	if (conn->alert_level) {
		wpabuf_free(conn->partial_input);
		conn->partial_input = NULL;
		conn->state = FAILED;
		os_free(msg);
		msg = tlsv1_client_send_alert(conn, conn->alert_level,
					      conn->alert_description,
					      out_len);
	} else if (msg == NULL) {
		msg = os_zalloc(1);
		*out_len = 0;
	}

	if (need_more_data == NULL || !(*need_more_data)) {
		wpabuf_free(conn->partial_input);
		conn->partial_input = NULL;
	}

	return msg;
}


/**
 * tlsv1_client_encrypt - Encrypt data into TLS tunnel
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Pointer to plaintext data to be encrypted
 * @in_len: Input buffer length
 * @out_data: Pointer to output buffer (encrypted TLS data)
 * @out_len: Maximum out_data length
 * Returns: Number of bytes written to out_data, -1 on failure
 *
 * This function is used after TLS handshake has been completed successfully to
 * send data in the encrypted tunnel.
 */
int tlsv1_client_encrypt(struct tlsv1_client *conn,
			 const u8 *in_data, size_t in_len,
			 u8 *out_data, size_t out_len)
{
	size_t rlen;

	wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
			in_data, in_len);

	if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
			      out_data, out_len, in_data, in_len, &rlen) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
		tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
			  TLS_ALERT_INTERNAL_ERROR);
		return -1;
	}

	return rlen;
}


/**
 * tlsv1_client_decrypt - Decrypt data from TLS tunnel
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Pointer to input buffer (encrypted TLS data)
 * @in_len: Input buffer length
 * @need_more_data: Set to 1 if more data would be needed to complete
 *	processing
 * Returns: Decrypted data or %NULL on failure
 *
 * This function is used after TLS handshake has been completed successfully to
 * receive data from the encrypted tunnel.
 */
struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
				     const u8 *in_data, size_t in_len,
				     int *need_more_data)
{
	const u8 *in_end, *pos;
	int used;
	u8 alert, *out_pos, ct;
	size_t olen;
	struct wpabuf *buf = NULL;

	if (need_more_data)
		*need_more_data = 0;

	if (conn->partial_input) {
		if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
			wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
				   "memory for pending record");
			alert = TLS_ALERT_INTERNAL_ERROR;
			goto fail;
		}
		wpabuf_put_data(conn->partial_input, in_data, in_len);
		in_data = wpabuf_head(conn->partial_input);
		in_len = wpabuf_len(conn->partial_input);
	}

	pos = in_data;
	in_end = in_data + in_len;

	while (pos < in_end) {
		ct = pos[0];
		if (wpabuf_resize(&buf, in_end - pos) < 0) {
			alert = TLS_ALERT_INTERNAL_ERROR;
			goto fail;
		}
		out_pos = wpabuf_put(buf, 0);
		olen = wpabuf_tailroom(buf);
		used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
					    out_pos, &olen, &alert);
		if (used < 0) {
			wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
				   "failed");
			goto fail;
		}
		if (used == 0) {
			struct wpabuf *partial;
			wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
			partial = wpabuf_alloc_copy(pos, in_end - pos);
			wpabuf_free(conn->partial_input);
			conn->partial_input = partial;
			if (conn->partial_input == NULL) {
				wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
					   "allocate memory for pending "
					   "record");
				alert = TLS_ALERT_INTERNAL_ERROR;
				goto fail;
			}
			if (need_more_data)
				*need_more_data = 1;
			return buf;
		}

		if (ct == TLS_CONTENT_TYPE_ALERT) {
			if (olen < 2) {
				wpa_printf(MSG_DEBUG, "TLSv1: Alert "
					   "underflow");
				alert = TLS_ALERT_DECODE_ERROR;
				goto fail;
			}
			wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
				   out_pos[0], out_pos[1]);
			if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
				/* Continue processing */
				pos += used;
				continue;
			}

			alert = out_pos[1];
			goto fail;
		}

		if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
			wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
				   "0x%x when decrypting application data",
				   pos[0]);
			alert = TLS_ALERT_UNEXPECTED_MESSAGE;
			goto fail;
		}

		wpabuf_put(buf, olen);

		pos += used;
	}

	wpabuf_free(conn->partial_input);
	conn->partial_input = NULL;
	return buf;

fail:
	wpabuf_free(buf);
	wpabuf_free(conn->partial_input);
	conn->partial_input = NULL;
	tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
	return NULL;
}


/**
 * tlsv1_client_global_init - Initialize TLSv1 client
 * Returns: 0 on success, -1 on failure
 *
 * This function must be called before using any other TLSv1 client functions.
 */
int tlsv1_client_global_init(void)
{
	return crypto_global_init();
}


/**
 * tlsv1_client_global_deinit - Deinitialize TLSv1 client
 *
 * This function can be used to deinitialize the TLSv1 client that was
 * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
 * can be called after this before calling tlsv1_client_global_init() again.
 */
void tlsv1_client_global_deinit(void)
{
	crypto_global_deinit();
}


/**
 * tlsv1_client_init - Initialize TLSv1 client connection
 * Returns: Pointer to TLSv1 client connection data or %NULL on failure
 */
struct tlsv1_client * tlsv1_client_init(void)
{
	struct tlsv1_client *conn;
	size_t count;
	u16 *suites;

	conn = os_zalloc(sizeof(*conn));
	if (conn == NULL)
		return NULL;

	conn->state = CLIENT_HELLO;

	if (tls_verify_hash_init(&conn->verify) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
			   "hash");
		os_free(conn);
		return NULL;
	}

	count = 0;
	suites = conn->cipher_suites;
	suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA256;
	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
	suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
	suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
	suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
	suites[count++] = TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
	suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
	suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
	conn->num_cipher_suites = count;

	conn->rl.tls_version = TLS_VERSION;

	return conn;
}


/**
 * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 */
void tlsv1_client_deinit(struct tlsv1_client *conn)
{
	crypto_public_key_free(conn->server_rsa_key);
	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
	tlsv1_record_change_write_cipher(&conn->rl);
	tlsv1_record_change_read_cipher(&conn->rl);
	tls_verify_hash_free(&conn->verify);
	os_free(conn->client_hello_ext);
	tlsv1_client_free_dh(conn);
	tlsv1_cred_free(conn->cred);
	wpabuf_free(conn->partial_input);
	x509_certificate_chain_free(conn->server_cert);
	os_free(conn);
}


/**
 * tlsv1_client_established - Check whether connection has been established
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if connection is established, 0 if not
 */
int tlsv1_client_established(struct tlsv1_client *conn)
{
	return conn->state == ESTABLISHED;
}


/**
 * tlsv1_client_prf - Use TLS-PRF to derive keying material
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @label: Label (e.g., description of the key) for PRF
 * @context: Optional extra upper-layer context (max len 2^16)
 * @context_len: The length of the context value
 * @server_random_first: seed is 0 = client_random|server_random,
 * 1 = server_random|client_random
 * @out: Buffer for output data from TLS-PRF
 * @out_len: Length of the output buffer
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
		     const u8 *context, size_t context_len,
		     int server_random_first, u8 *out, size_t out_len)
{
	u8 *seed, *pos;
	size_t seed_len = 2 * TLS_RANDOM_LEN;
	int res;

	if (conn->state != ESTABLISHED)
		return -1;

	if (context_len > 65535)
		return -1;

	if (context)
		seed_len += 2 + context_len;

	seed = os_malloc(seed_len);
	if (!seed)
		return -1;

	if (server_random_first) {
		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
			  TLS_RANDOM_LEN);
	} else {
		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
			  TLS_RANDOM_LEN);
	}

	if (context) {
		pos = seed + 2 * TLS_RANDOM_LEN;
		WPA_PUT_BE16(pos, context_len);
		pos += 2;
		os_memcpy(pos, context, context_len);
	}

	res = tls_prf(conn->rl.tls_version,
		      conn->master_secret, TLS_MASTER_SECRET_LEN,
		      label, seed, seed_len, out, out_len);
	os_free(seed);
	return res;
}


/**
 * tlsv1_client_get_cipher - Get current cipher name
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @buf: Buffer for the cipher name
 * @buflen: buf size
 * Returns: 0 on success, -1 on failure
 *
 * Get the name of the currently used cipher.
 */
int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
			    size_t buflen)
{
	char *cipher;

	switch (conn->rl.cipher_suite) {
	case TLS_RSA_WITH_RC4_128_MD5:
		cipher = "RC4-MD5";
		break;
	case TLS_RSA_WITH_RC4_128_SHA:
		cipher = "RC4-SHA";
		break;
	case TLS_RSA_WITH_DES_CBC_SHA:
		cipher = "DES-CBC-SHA";
		break;
	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
		cipher = "DES-CBC3-SHA";
		break;
	case TLS_DHE_RSA_WITH_DES_CBC_SHA:
		cipher = "DHE-RSA-DES-CBC-SHA";
		break;
	case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
		cipher = "DHE-RSA-DES-CBC3-SHA";
		break;
	case TLS_DH_anon_WITH_RC4_128_MD5:
		cipher = "ADH-RC4-MD5";
		break;
	case TLS_DH_anon_WITH_DES_CBC_SHA:
		cipher = "ADH-DES-SHA";
		break;
	case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
		cipher = "ADH-DES-CBC3-SHA";
		break;
	case TLS_RSA_WITH_AES_128_CBC_SHA:
		cipher = "AES-128-SHA";
		break;
	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
		cipher = "DHE-RSA-AES-128-SHA";
		break;
	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
		cipher = "ADH-AES-128-SHA";
		break;
	case TLS_RSA_WITH_AES_256_CBC_SHA:
		cipher = "AES-256-SHA";
		break;
	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
		cipher = "DHE-RSA-AES-256-SHA";
		break;
	case TLS_DH_anon_WITH_AES_256_CBC_SHA:
		cipher = "ADH-AES-256-SHA";
		break;
	case TLS_RSA_WITH_AES_128_CBC_SHA256:
		cipher = "AES-128-SHA256";
		break;
	case TLS_RSA_WITH_AES_256_CBC_SHA256:
		cipher = "AES-256-SHA256";
		break;
	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
		cipher = "DHE-RSA-AES-128-SHA256";
		break;
	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
		cipher = "DHE-RSA-AES-256-SHA256";
		break;
	case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
		cipher = "ADH-AES-128-SHA256";
		break;
	case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
		cipher = "ADH-AES-256-SHA256";
		break;
	default:
		return -1;
	}

	if (os_strlcpy(buf, cipher, buflen) >= buflen)
		return -1;
	return 0;
}


/**
 * tlsv1_client_shutdown - Shutdown TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_shutdown(struct tlsv1_client *conn)
{
	conn->state = CLIENT_HELLO;

	if (tls_verify_hash_init(&conn->verify) < 0) {
		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
			   "hash");
		return -1;
	}

	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
	tlsv1_record_change_write_cipher(&conn->rl);
	tlsv1_record_change_read_cipher(&conn->rl);

	conn->certificate_requested = 0;
	crypto_public_key_free(conn->server_rsa_key);
	conn->server_rsa_key = NULL;
	conn->session_resumed = 0;

	return 0;
}


/**
 * tlsv1_client_resumed - Was session resumption used
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if current session used session resumption, 0 if not
 */
int tlsv1_client_resumed(struct tlsv1_client *conn)
{
	return !!conn->session_resumed;
}


/**
 * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ext_type: Extension type
 * @data: Extension payload (%NULL to remove extension)
 * @data_len: Extension payload length
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
			   const u8 *data, size_t data_len)
{
	u8 *pos;

	conn->session_ticket_included = 0;
	os_free(conn->client_hello_ext);
	conn->client_hello_ext = NULL;
	conn->client_hello_ext_len = 0;

	if (data == NULL || data_len == 0)
		return 0;

	pos = conn->client_hello_ext = os_malloc(4 + data_len);
	if (pos == NULL)
		return -1;

	WPA_PUT_BE16(pos, ext_type);
	pos += 2;
	WPA_PUT_BE16(pos, data_len);
	pos += 2;
	os_memcpy(pos, data, data_len);
	conn->client_hello_ext_len = 4 + data_len;

	if (ext_type == TLS_EXT_PAC_OPAQUE) {
		conn->session_ticket_included = 1;
		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
	}

	return 0;
}


/**
 * tlsv1_client_get_random - Get random data from TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @keys: Structure of random data (filled on success)
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
{
	os_memset(keys, 0, sizeof(*keys));
	if (conn->state == CLIENT_HELLO)
		return -1;

	keys->client_random = conn->client_random;
	keys->client_random_len = TLS_RANDOM_LEN;

	if (conn->state != SERVER_HELLO) {
		keys->server_random = conn->server_random;
		keys->server_random_len = TLS_RANDOM_LEN;
	}

	return 0;
}


/**
 * tlsv1_client_get_keyblock_size - Get TLS key_block size
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 * failure
 */
int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
{
	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
		return -1;

	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
		    conn->rl.iv_size);
}


/**
 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 * (TLS_CIPHER_*).
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
{
	size_t count;
	u16 *suites;

	/* TODO: implement proper configuration of cipher suites */
	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
		count = 0;
		suites = conn->cipher_suites;
		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;

		/*
		 * Cisco AP (at least 350 and 1200 series) local authentication
		 * server does not know how to search cipher suites from the
		 * list and seem to require that the last entry in the list is
		 * the one that it wants to use. However, TLS specification
		 * requires the list to be in the client preference order. As a
		 * workaround, add anon-DH AES-128-SHA1 again at the end of the
		 * list to allow the Cisco code to find it.
		 */
		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
		conn->num_cipher_suites = count;
	}

	return 0;
}


/**
 * tlsv1_client_set_cred - Set client credentials
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @cred: Credentials from tlsv1_cred_alloc()
 * Returns: 0 on success, -1 on failure
 *
 * On success, the client takes ownership of the credentials block and caller
 * must not free it. On failure, caller is responsible for freeing the
 * credential block.
 */
int tlsv1_client_set_cred(struct tlsv1_client *conn,
			  struct tlsv1_credentials *cred)
{
	tlsv1_cred_free(conn->cred);
	conn->cred = cred;
	return 0;
}


/**
 * tlsv1_client_set_flags - Set connection flags
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @flags: TLS_CONN_* bitfield
 */
void tlsv1_client_set_flags(struct tlsv1_client *conn, unsigned int flags)
{
	conn->flags = flags;
}


void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
					tlsv1_client_session_ticket_cb cb,
					void *ctx)
{
	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
		   cb, ctx);
	conn->session_ticket_cb = cb;
	conn->session_ticket_cb_ctx = ctx;
}


void tlsv1_client_set_cb(struct tlsv1_client *conn,
			 void (*event_cb)(void *ctx, enum tls_event ev,
					  union tls_event_data *data),
			 void *cb_ctx,
			 int cert_in_cb)
{
	conn->event_cb = event_cb;
	conn->cb_ctx = cb_ctx;
	conn->cert_in_cb = !!cert_in_cb;
}


int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
			     size_t buflen)
{
	if (!conn)
		return -1;
	switch (conn->rl.tls_version) {
	case TLS_VERSION_1:
		os_strlcpy(buf, "TLSv1", buflen);
		break;
	case TLS_VERSION_1_1:
		os_strlcpy(buf, "TLSv1.1", buflen);
		break;
	case TLS_VERSION_1_2:
		os_strlcpy(buf, "TLSv1.2", buflen);
		break;
	default:
		return -1;
	}

	return 0;
}