tlsv1_client.c revision 9bce59c7fef20e34a05f04d1e33a4076083dca0c
1/*
2 * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
3 * Copyright (c) 2006-2011, 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/sha1.h"
13#include "crypto/tls.h"
14#include "tlsv1_common.h"
15#include "tlsv1_record.h"
16#include "tlsv1_client.h"
17#include "tlsv1_client_i.h"
18
19/* TODO:
20 * Support for a message fragmented across several records (RFC 2246, 6.2.1)
21 */
22
23
24void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
25{
26	conn->alert_level = level;
27	conn->alert_description = description;
28}
29
30
31void tlsv1_client_free_dh(struct tlsv1_client *conn)
32{
33	os_free(conn->dh_p);
34	os_free(conn->dh_g);
35	os_free(conn->dh_ys);
36	conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
37}
38
39
40int tls_derive_pre_master_secret(u8 *pre_master_secret)
41{
42	WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
43	if (os_get_random(pre_master_secret + 2,
44			  TLS_PRE_MASTER_SECRET_LEN - 2))
45		return -1;
46	return 0;
47}
48
49
50int tls_derive_keys(struct tlsv1_client *conn,
51		    const u8 *pre_master_secret, size_t pre_master_secret_len)
52{
53	u8 seed[2 * TLS_RANDOM_LEN];
54	u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
55	u8 *pos;
56	size_t key_block_len;
57
58	if (pre_master_secret) {
59		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
60				pre_master_secret, pre_master_secret_len);
61		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
62		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
63			  TLS_RANDOM_LEN);
64		if (tls_prf(conn->rl.tls_version,
65			    pre_master_secret, pre_master_secret_len,
66			    "master secret", seed, 2 * TLS_RANDOM_LEN,
67			    conn->master_secret, TLS_MASTER_SECRET_LEN)) {
68			wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
69				   "master_secret");
70			return -1;
71		}
72		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
73				conn->master_secret, TLS_MASTER_SECRET_LEN);
74	}
75
76	os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
77	os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
78	key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
79	if (conn->rl.tls_version == TLS_VERSION_1)
80		key_block_len += 2 * conn->rl.iv_size;
81	if (tls_prf(conn->rl.tls_version,
82		    conn->master_secret, TLS_MASTER_SECRET_LEN,
83		    "key expansion", seed, 2 * TLS_RANDOM_LEN,
84		    key_block, key_block_len)) {
85		wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
86		return -1;
87	}
88	wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
89			key_block, key_block_len);
90
91	pos = key_block;
92
93	/* client_write_MAC_secret */
94	os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
95	pos += conn->rl.hash_size;
96	/* server_write_MAC_secret */
97	os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
98	pos += conn->rl.hash_size;
99
100	/* client_write_key */
101	os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
102	pos += conn->rl.key_material_len;
103	/* server_write_key */
104	os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
105	pos += conn->rl.key_material_len;
106
107	if (conn->rl.tls_version == TLS_VERSION_1) {
108		/* client_write_IV */
109		os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
110		pos += conn->rl.iv_size;
111		/* server_write_IV */
112		os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
113		pos += conn->rl.iv_size;
114	} else {
115		/*
116		 * Use IV field to set the mask value for TLS v1.1. A fixed
117		 * mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
118		 * Cipher option 2a.
119		 */
120		os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
121	}
122
123	return 0;
124}
125
126
127/**
128 * tlsv1_client_handshake - Process TLS handshake
129 * @conn: TLSv1 client connection data from tlsv1_client_init()
130 * @in_data: Input data from TLS peer
131 * @in_len: Input data length
132 * @out_len: Length of the output buffer.
133 * @appl_data: Pointer to application data pointer, or %NULL if dropped
134 * @appl_data_len: Pointer to variable that is set to appl_data length
135 * @need_more_data: Set to 1 if more data would be needed to complete
136 *	processing
137 * Returns: Pointer to output data, %NULL on failure
138 */
139u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
140			    const u8 *in_data, size_t in_len,
141			    size_t *out_len, u8 **appl_data,
142			    size_t *appl_data_len, int *need_more_data)
143{
144	const u8 *pos, *end;
145	u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
146	size_t in_msg_len;
147	int no_appl_data;
148	int used;
149
150	if (need_more_data)
151		*need_more_data = 0;
152
153	if (conn->state == CLIENT_HELLO) {
154		if (in_len)
155			return NULL;
156		return tls_send_client_hello(conn, out_len);
157	}
158
159	if (conn->partial_input) {
160		if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
161			wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
162				   "memory for pending record");
163			tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
164				  TLS_ALERT_INTERNAL_ERROR);
165			goto failed;
166		}
167		wpabuf_put_data(conn->partial_input, in_data, in_len);
168		in_data = wpabuf_head(conn->partial_input);
169		in_len = wpabuf_len(conn->partial_input);
170	}
171
172	if (in_data == NULL || in_len == 0)
173		return NULL;
174
175	pos = in_data;
176	end = in_data + in_len;
177	in_msg = os_malloc(in_len);
178	if (in_msg == NULL)
179		return NULL;
180
181	/* Each received packet may include multiple records */
182	while (pos < end) {
183		in_msg_len = in_len;
184		used = tlsv1_record_receive(&conn->rl, pos, end - pos,
185					    in_msg, &in_msg_len, &alert);
186		if (used < 0) {
187			wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
188				   "record failed");
189			tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
190			goto failed;
191		}
192		if (used == 0) {
193			struct wpabuf *partial;
194			wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
195			partial = wpabuf_alloc_copy(pos, end - pos);
196			wpabuf_free(conn->partial_input);
197			conn->partial_input = partial;
198			if (conn->partial_input == NULL) {
199				wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
200					   "allocate memory for pending "
201					   "record");
202				tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
203					  TLS_ALERT_INTERNAL_ERROR);
204				goto failed;
205			}
206			os_free(in_msg);
207			if (need_more_data)
208				*need_more_data = 1;
209			return NULL;
210		}
211		ct = pos[0];
212
213		in_pos = in_msg;
214		in_end = in_msg + in_msg_len;
215
216		/* Each received record may include multiple messages of the
217		 * same ContentType. */
218		while (in_pos < in_end) {
219			in_msg_len = in_end - in_pos;
220			if (tlsv1_client_process_handshake(conn, ct, in_pos,
221							   &in_msg_len,
222							   appl_data,
223							   appl_data_len) < 0)
224				goto failed;
225			in_pos += in_msg_len;
226		}
227
228		pos += used;
229	}
230
231	os_free(in_msg);
232	in_msg = NULL;
233
234	no_appl_data = appl_data == NULL || *appl_data == NULL;
235	msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
236
237failed:
238	os_free(in_msg);
239	if (conn->alert_level) {
240		wpabuf_free(conn->partial_input);
241		conn->partial_input = NULL;
242		conn->state = FAILED;
243		os_free(msg);
244		msg = tlsv1_client_send_alert(conn, conn->alert_level,
245					      conn->alert_description,
246					      out_len);
247	} else if (msg == NULL) {
248		msg = os_zalloc(1);
249		*out_len = 0;
250	}
251
252	if (need_more_data == NULL || !(*need_more_data)) {
253		wpabuf_free(conn->partial_input);
254		conn->partial_input = NULL;
255	}
256
257	return msg;
258}
259
260
261/**
262 * tlsv1_client_encrypt - Encrypt data into TLS tunnel
263 * @conn: TLSv1 client connection data from tlsv1_client_init()
264 * @in_data: Pointer to plaintext data to be encrypted
265 * @in_len: Input buffer length
266 * @out_data: Pointer to output buffer (encrypted TLS data)
267 * @out_len: Maximum out_data length
268 * Returns: Number of bytes written to out_data, -1 on failure
269 *
270 * This function is used after TLS handshake has been completed successfully to
271 * send data in the encrypted tunnel.
272 */
273int tlsv1_client_encrypt(struct tlsv1_client *conn,
274			 const u8 *in_data, size_t in_len,
275			 u8 *out_data, size_t out_len)
276{
277	size_t rlen;
278
279	wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
280			in_data, in_len);
281
282	if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
283			      out_data, out_len, in_data, in_len, &rlen) < 0) {
284		wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
285		tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
286			  TLS_ALERT_INTERNAL_ERROR);
287		return -1;
288	}
289
290	return rlen;
291}
292
293
294/**
295 * tlsv1_client_decrypt - Decrypt data from TLS tunnel
296 * @conn: TLSv1 client connection data from tlsv1_client_init()
297 * @in_data: Pointer to input buffer (encrypted TLS data)
298 * @in_len: Input buffer length
299 * @need_more_data: Set to 1 if more data would be needed to complete
300 *	processing
301 * Returns: Decrypted data or %NULL on failure
302 *
303 * This function is used after TLS handshake has been completed successfully to
304 * receive data from the encrypted tunnel.
305 */
306struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
307				     const u8 *in_data, size_t in_len,
308				     int *need_more_data)
309{
310	const u8 *in_end, *pos;
311	int used;
312	u8 alert, *out_pos, ct;
313	size_t olen;
314	struct wpabuf *buf = NULL;
315
316	if (need_more_data)
317		*need_more_data = 0;
318
319	if (conn->partial_input) {
320		if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
321			wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
322				   "memory for pending record");
323			alert = TLS_ALERT_INTERNAL_ERROR;
324			goto fail;
325		}
326		wpabuf_put_data(conn->partial_input, in_data, in_len);
327		in_data = wpabuf_head(conn->partial_input);
328		in_len = wpabuf_len(conn->partial_input);
329	}
330
331	pos = in_data;
332	in_end = in_data + in_len;
333
334	while (pos < in_end) {
335		ct = pos[0];
336		if (wpabuf_resize(&buf, in_end - pos) < 0) {
337			alert = TLS_ALERT_INTERNAL_ERROR;
338			goto fail;
339		}
340		out_pos = wpabuf_put(buf, 0);
341		olen = wpabuf_tailroom(buf);
342		used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
343					    out_pos, &olen, &alert);
344		if (used < 0) {
345			wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
346				   "failed");
347			goto fail;
348		}
349		if (used == 0) {
350			struct wpabuf *partial;
351			wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
352			partial = wpabuf_alloc_copy(pos, in_end - pos);
353			wpabuf_free(conn->partial_input);
354			conn->partial_input = partial;
355			if (conn->partial_input == NULL) {
356				wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
357					   "allocate memory for pending "
358					   "record");
359				alert = TLS_ALERT_INTERNAL_ERROR;
360				goto fail;
361			}
362			if (need_more_data)
363				*need_more_data = 1;
364			return buf;
365		}
366
367		if (ct == TLS_CONTENT_TYPE_ALERT) {
368			if (olen < 2) {
369				wpa_printf(MSG_DEBUG, "TLSv1: Alert "
370					   "underflow");
371				alert = TLS_ALERT_DECODE_ERROR;
372				goto fail;
373			}
374			wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
375				   out_pos[0], out_pos[1]);
376			if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
377				/* Continue processing */
378				pos += used;
379				continue;
380			}
381
382			alert = out_pos[1];
383			goto fail;
384		}
385
386		if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
387			wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
388				   "0x%x when decrypting application data",
389				   pos[0]);
390			alert = TLS_ALERT_UNEXPECTED_MESSAGE;
391			goto fail;
392		}
393
394		wpabuf_put(buf, olen);
395
396		pos += used;
397	}
398
399	wpabuf_free(conn->partial_input);
400	conn->partial_input = NULL;
401	return buf;
402
403fail:
404	wpabuf_free(buf);
405	wpabuf_free(conn->partial_input);
406	conn->partial_input = NULL;
407	tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
408	return NULL;
409}
410
411
412/**
413 * tlsv1_client_global_init - Initialize TLSv1 client
414 * Returns: 0 on success, -1 on failure
415 *
416 * This function must be called before using any other TLSv1 client functions.
417 */
418int tlsv1_client_global_init(void)
419{
420	return crypto_global_init();
421}
422
423
424/**
425 * tlsv1_client_global_deinit - Deinitialize TLSv1 client
426 *
427 * This function can be used to deinitialize the TLSv1 client that was
428 * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
429 * can be called after this before calling tlsv1_client_global_init() again.
430 */
431void tlsv1_client_global_deinit(void)
432{
433	crypto_global_deinit();
434}
435
436
437/**
438 * tlsv1_client_init - Initialize TLSv1 client connection
439 * Returns: Pointer to TLSv1 client connection data or %NULL on failure
440 */
441struct tlsv1_client * tlsv1_client_init(void)
442{
443	struct tlsv1_client *conn;
444	size_t count;
445	u16 *suites;
446
447	conn = os_zalloc(sizeof(*conn));
448	if (conn == NULL)
449		return NULL;
450
451	conn->state = CLIENT_HELLO;
452
453	if (tls_verify_hash_init(&conn->verify) < 0) {
454		wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
455			   "hash");
456		os_free(conn);
457		return NULL;
458	}
459
460	count = 0;
461	suites = conn->cipher_suites;
462	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
463	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
464	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
465	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
466	suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
467	suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
468	suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
469	conn->num_cipher_suites = count;
470
471	conn->rl.tls_version = TLS_VERSION;
472
473	return conn;
474}
475
476
477/**
478 * tlsv1_client_deinit - Deinitialize TLSv1 client connection
479 * @conn: TLSv1 client connection data from tlsv1_client_init()
480 */
481void tlsv1_client_deinit(struct tlsv1_client *conn)
482{
483	crypto_public_key_free(conn->server_rsa_key);
484	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
485	tlsv1_record_change_write_cipher(&conn->rl);
486	tlsv1_record_change_read_cipher(&conn->rl);
487	tls_verify_hash_free(&conn->verify);
488	os_free(conn->client_hello_ext);
489	tlsv1_client_free_dh(conn);
490	tlsv1_cred_free(conn->cred);
491	wpabuf_free(conn->partial_input);
492	os_free(conn);
493}
494
495
496/**
497 * tlsv1_client_established - Check whether connection has been established
498 * @conn: TLSv1 client connection data from tlsv1_client_init()
499 * Returns: 1 if connection is established, 0 if not
500 */
501int tlsv1_client_established(struct tlsv1_client *conn)
502{
503	return conn->state == ESTABLISHED;
504}
505
506
507/**
508 * tlsv1_client_prf - Use TLS-PRF to derive keying material
509 * @conn: TLSv1 client connection data from tlsv1_client_init()
510 * @label: Label (e.g., description of the key) for PRF
511 * @server_random_first: seed is 0 = client_random|server_random,
512 * 1 = server_random|client_random
513 * @out: Buffer for output data from TLS-PRF
514 * @out_len: Length of the output buffer
515 * Returns: 0 on success, -1 on failure
516 */
517int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
518		     int server_random_first, u8 *out, size_t out_len)
519{
520	u8 seed[2 * TLS_RANDOM_LEN];
521
522	if (conn->state != ESTABLISHED)
523		return -1;
524
525	if (server_random_first) {
526		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
527		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
528			  TLS_RANDOM_LEN);
529	} else {
530		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
531		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
532			  TLS_RANDOM_LEN);
533	}
534
535	return tls_prf(conn->rl.tls_version,
536		       conn->master_secret, TLS_MASTER_SECRET_LEN,
537		       label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
538}
539
540
541/**
542 * tlsv1_client_get_cipher - Get current cipher name
543 * @conn: TLSv1 client connection data from tlsv1_client_init()
544 * @buf: Buffer for the cipher name
545 * @buflen: buf size
546 * Returns: 0 on success, -1 on failure
547 *
548 * Get the name of the currently used cipher.
549 */
550int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
551			    size_t buflen)
552{
553	char *cipher;
554
555	switch (conn->rl.cipher_suite) {
556	case TLS_RSA_WITH_RC4_128_MD5:
557		cipher = "RC4-MD5";
558		break;
559	case TLS_RSA_WITH_RC4_128_SHA:
560		cipher = "RC4-SHA";
561		break;
562	case TLS_RSA_WITH_DES_CBC_SHA:
563		cipher = "DES-CBC-SHA";
564		break;
565	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
566		cipher = "DES-CBC3-SHA";
567		break;
568	case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
569		cipher = "ADH-AES-128-SHA256";
570		break;
571	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
572		cipher = "ADH-AES-128-SHA";
573		break;
574	case TLS_RSA_WITH_AES_256_CBC_SHA:
575		cipher = "AES-256-SHA";
576		break;
577	case TLS_RSA_WITH_AES_256_CBC_SHA256:
578		cipher = "AES-256-SHA256";
579		break;
580	case TLS_RSA_WITH_AES_128_CBC_SHA:
581		cipher = "AES-128-SHA";
582		break;
583	case TLS_RSA_WITH_AES_128_CBC_SHA256:
584		cipher = "AES-128-SHA256";
585		break;
586	default:
587		return -1;
588	}
589
590	if (os_strlcpy(buf, cipher, buflen) >= buflen)
591		return -1;
592	return 0;
593}
594
595
596/**
597 * tlsv1_client_shutdown - Shutdown TLS connection
598 * @conn: TLSv1 client connection data from tlsv1_client_init()
599 * Returns: 0 on success, -1 on failure
600 */
601int tlsv1_client_shutdown(struct tlsv1_client *conn)
602{
603	conn->state = CLIENT_HELLO;
604
605	if (tls_verify_hash_init(&conn->verify) < 0) {
606		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
607			   "hash");
608		return -1;
609	}
610
611	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
612	tlsv1_record_change_write_cipher(&conn->rl);
613	tlsv1_record_change_read_cipher(&conn->rl);
614
615	conn->certificate_requested = 0;
616	crypto_public_key_free(conn->server_rsa_key);
617	conn->server_rsa_key = NULL;
618	conn->session_resumed = 0;
619
620	return 0;
621}
622
623
624/**
625 * tlsv1_client_resumed - Was session resumption used
626 * @conn: TLSv1 client connection data from tlsv1_client_init()
627 * Returns: 1 if current session used session resumption, 0 if not
628 */
629int tlsv1_client_resumed(struct tlsv1_client *conn)
630{
631	return !!conn->session_resumed;
632}
633
634
635/**
636 * tlsv1_client_hello_ext - Set TLS extension for ClientHello
637 * @conn: TLSv1 client connection data from tlsv1_client_init()
638 * @ext_type: Extension type
639 * @data: Extension payload (%NULL to remove extension)
640 * @data_len: Extension payload length
641 * Returns: 0 on success, -1 on failure
642 */
643int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
644			   const u8 *data, size_t data_len)
645{
646	u8 *pos;
647
648	conn->session_ticket_included = 0;
649	os_free(conn->client_hello_ext);
650	conn->client_hello_ext = NULL;
651	conn->client_hello_ext_len = 0;
652
653	if (data == NULL || data_len == 0)
654		return 0;
655
656	pos = conn->client_hello_ext = os_malloc(6 + data_len);
657	if (pos == NULL)
658		return -1;
659
660	WPA_PUT_BE16(pos, 4 + data_len);
661	pos += 2;
662	WPA_PUT_BE16(pos, ext_type);
663	pos += 2;
664	WPA_PUT_BE16(pos, data_len);
665	pos += 2;
666	os_memcpy(pos, data, data_len);
667	conn->client_hello_ext_len = 6 + data_len;
668
669	if (ext_type == TLS_EXT_PAC_OPAQUE) {
670		conn->session_ticket_included = 1;
671		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
672	}
673
674	return 0;
675}
676
677
678/**
679 * tlsv1_client_get_keys - Get master key and random data from TLS connection
680 * @conn: TLSv1 client connection data from tlsv1_client_init()
681 * @keys: Structure of key/random data (filled on success)
682 * Returns: 0 on success, -1 on failure
683 */
684int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
685{
686	os_memset(keys, 0, sizeof(*keys));
687	if (conn->state == CLIENT_HELLO)
688		return -1;
689
690	keys->client_random = conn->client_random;
691	keys->client_random_len = TLS_RANDOM_LEN;
692
693	if (conn->state != SERVER_HELLO) {
694		keys->server_random = conn->server_random;
695		keys->server_random_len = TLS_RANDOM_LEN;
696		keys->master_key = conn->master_secret;
697		keys->master_key_len = TLS_MASTER_SECRET_LEN;
698	}
699
700	return 0;
701}
702
703
704/**
705 * tlsv1_client_get_keyblock_size - Get TLS key_block size
706 * @conn: TLSv1 client connection data from tlsv1_client_init()
707 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
708 * failure
709 */
710int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
711{
712	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
713		return -1;
714
715	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
716		    conn->rl.iv_size);
717}
718
719
720/**
721 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
722 * @conn: TLSv1 client connection data from tlsv1_client_init()
723 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
724 * (TLS_CIPHER_*).
725 * Returns: 0 on success, -1 on failure
726 */
727int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
728{
729	size_t count;
730	u16 *suites;
731
732	/* TODO: implement proper configuration of cipher suites */
733	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
734		count = 0;
735		suites = conn->cipher_suites;
736		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
737		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
738		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
739		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
740		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
741		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
742		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
743
744		/*
745		 * Cisco AP (at least 350 and 1200 series) local authentication
746		 * server does not know how to search cipher suites from the
747		 * list and seem to require that the last entry in the list is
748		 * the one that it wants to use. However, TLS specification
749		 * requires the list to be in the client preference order. As a
750		 * workaround, add anon-DH AES-128-SHA1 again at the end of the
751		 * list to allow the Cisco code to find it.
752		 */
753		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
754		conn->num_cipher_suites = count;
755	}
756
757	return 0;
758}
759
760
761/**
762 * tlsv1_client_set_cred - Set client credentials
763 * @conn: TLSv1 client connection data from tlsv1_client_init()
764 * @cred: Credentials from tlsv1_cred_alloc()
765 * Returns: 0 on success, -1 on failure
766 *
767 * On success, the client takes ownership of the credentials block and caller
768 * must not free it. On failure, caller is responsible for freeing the
769 * credential block.
770 */
771int tlsv1_client_set_cred(struct tlsv1_client *conn,
772			  struct tlsv1_credentials *cred)
773{
774	tlsv1_cred_free(conn->cred);
775	conn->cred = cred;
776	return 0;
777}
778
779
780void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
781{
782	conn->disable_time_checks = !enabled;
783}
784
785
786void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
787					tlsv1_client_session_ticket_cb cb,
788					void *ctx)
789{
790	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
791		   cb, ctx);
792	conn->session_ticket_cb = cb;
793	conn->session_ticket_cb_ctx = ctx;
794}
795