1/*
2 * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
3 * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "crypto/sha1.h"
13#include "crypto/tls.h"
14#include "x509v3.h"
15#include "tlsv1_common.h"
16#include "tlsv1_record.h"
17#include "tlsv1_client.h"
18#include "tlsv1_client_i.h"
19
20/* TODO:
21 * Support for a message fragmented across several records (RFC 2246, 6.2.1)
22 */
23
24
25void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
26{
27	conn->alert_level = level;
28	conn->alert_description = description;
29}
30
31
32void tlsv1_client_free_dh(struct tlsv1_client *conn)
33{
34	os_free(conn->dh_p);
35	os_free(conn->dh_g);
36	os_free(conn->dh_ys);
37	conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
38}
39
40
41int tls_derive_pre_master_secret(u8 *pre_master_secret)
42{
43	WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
44	if (os_get_random(pre_master_secret + 2,
45			  TLS_PRE_MASTER_SECRET_LEN - 2))
46		return -1;
47	return 0;
48}
49
50
51int tls_derive_keys(struct tlsv1_client *conn,
52		    const u8 *pre_master_secret, size_t pre_master_secret_len)
53{
54	u8 seed[2 * TLS_RANDOM_LEN];
55	u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
56	u8 *pos;
57	size_t key_block_len;
58
59	if (pre_master_secret) {
60		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
61				pre_master_secret, pre_master_secret_len);
62		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
63		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
64			  TLS_RANDOM_LEN);
65		if (tls_prf(conn->rl.tls_version,
66			    pre_master_secret, pre_master_secret_len,
67			    "master secret", seed, 2 * TLS_RANDOM_LEN,
68			    conn->master_secret, TLS_MASTER_SECRET_LEN)) {
69			wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
70				   "master_secret");
71			return -1;
72		}
73		wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
74				conn->master_secret, TLS_MASTER_SECRET_LEN);
75	}
76
77	os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
78	os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
79	key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);
80	if (conn->rl.tls_version == TLS_VERSION_1)
81		key_block_len += 2 * conn->rl.iv_size;
82	if (tls_prf(conn->rl.tls_version,
83		    conn->master_secret, TLS_MASTER_SECRET_LEN,
84		    "key expansion", seed, 2 * TLS_RANDOM_LEN,
85		    key_block, key_block_len)) {
86		wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
87		return -1;
88	}
89	wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
90			key_block, key_block_len);
91
92	pos = key_block;
93
94	/* client_write_MAC_secret */
95	os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
96	pos += conn->rl.hash_size;
97	/* server_write_MAC_secret */
98	os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
99	pos += conn->rl.hash_size;
100
101	/* client_write_key */
102	os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
103	pos += conn->rl.key_material_len;
104	/* server_write_key */
105	os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
106	pos += conn->rl.key_material_len;
107
108	if (conn->rl.tls_version == TLS_VERSION_1) {
109		/* client_write_IV */
110		os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
111		pos += conn->rl.iv_size;
112		/* server_write_IV */
113		os_memcpy(conn->rl.read_iv, 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_DHE_RSA_WITH_AES_256_CBC_SHA256;
463	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
464	suites[count++] = TLS_DHE_RSA_WITH_AES_256_CBC_SHA;
465	suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
466	suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA256;
467	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
468	suites[count++] = TLS_DHE_RSA_WITH_AES_128_CBC_SHA;
469	suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
470	suites[count++] = TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA;
471	suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
472	suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
473	suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
474	conn->num_cipher_suites = count;
475
476	conn->rl.tls_version = TLS_VERSION;
477
478	return conn;
479}
480
481
482/**
483 * tlsv1_client_deinit - Deinitialize TLSv1 client connection
484 * @conn: TLSv1 client connection data from tlsv1_client_init()
485 */
486void tlsv1_client_deinit(struct tlsv1_client *conn)
487{
488	crypto_public_key_free(conn->server_rsa_key);
489	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
490	tlsv1_record_change_write_cipher(&conn->rl);
491	tlsv1_record_change_read_cipher(&conn->rl);
492	tls_verify_hash_free(&conn->verify);
493	os_free(conn->client_hello_ext);
494	tlsv1_client_free_dh(conn);
495	tlsv1_cred_free(conn->cred);
496	wpabuf_free(conn->partial_input);
497	x509_certificate_chain_free(conn->server_cert);
498	os_free(conn);
499}
500
501
502/**
503 * tlsv1_client_established - Check whether connection has been established
504 * @conn: TLSv1 client connection data from tlsv1_client_init()
505 * Returns: 1 if connection is established, 0 if not
506 */
507int tlsv1_client_established(struct tlsv1_client *conn)
508{
509	return conn->state == ESTABLISHED;
510}
511
512
513/**
514 * tlsv1_client_prf - Use TLS-PRF to derive keying material
515 * @conn: TLSv1 client connection data from tlsv1_client_init()
516 * @label: Label (e.g., description of the key) for PRF
517 * @server_random_first: seed is 0 = client_random|server_random,
518 * 1 = server_random|client_random
519 * @out: Buffer for output data from TLS-PRF
520 * @out_len: Length of the output buffer
521 * Returns: 0 on success, -1 on failure
522 */
523int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
524		     int server_random_first, u8 *out, size_t out_len)
525{
526	u8 seed[2 * TLS_RANDOM_LEN];
527
528	if (conn->state != ESTABLISHED)
529		return -1;
530
531	if (server_random_first) {
532		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
533		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
534			  TLS_RANDOM_LEN);
535	} else {
536		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
537		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
538			  TLS_RANDOM_LEN);
539	}
540
541	return tls_prf(conn->rl.tls_version,
542		       conn->master_secret, TLS_MASTER_SECRET_LEN,
543		       label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
544}
545
546
547/**
548 * tlsv1_client_get_cipher - Get current cipher name
549 * @conn: TLSv1 client connection data from tlsv1_client_init()
550 * @buf: Buffer for the cipher name
551 * @buflen: buf size
552 * Returns: 0 on success, -1 on failure
553 *
554 * Get the name of the currently used cipher.
555 */
556int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
557			    size_t buflen)
558{
559	char *cipher;
560
561	switch (conn->rl.cipher_suite) {
562	case TLS_RSA_WITH_RC4_128_MD5:
563		cipher = "RC4-MD5";
564		break;
565	case TLS_RSA_WITH_RC4_128_SHA:
566		cipher = "RC4-SHA";
567		break;
568	case TLS_RSA_WITH_DES_CBC_SHA:
569		cipher = "DES-CBC-SHA";
570		break;
571	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
572		cipher = "DES-CBC3-SHA";
573		break;
574	case TLS_DHE_RSA_WITH_DES_CBC_SHA:
575		cipher = "DHE-RSA-DES-CBC-SHA";
576		break;
577	case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
578		cipher = "DHE-RSA-DES-CBC3-SHA";
579		break;
580	case TLS_DH_anon_WITH_RC4_128_MD5:
581		cipher = "ADH-RC4-MD5";
582		break;
583	case TLS_DH_anon_WITH_DES_CBC_SHA:
584		cipher = "ADH-DES-SHA";
585		break;
586	case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
587		cipher = "ADH-DES-CBC3-SHA";
588		break;
589	case TLS_RSA_WITH_AES_128_CBC_SHA:
590		cipher = "AES-128-SHA";
591		break;
592	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
593		cipher = "DHE-RSA-AES-128-SHA";
594		break;
595	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
596		cipher = "ADH-AES-128-SHA";
597		break;
598	case TLS_RSA_WITH_AES_256_CBC_SHA:
599		cipher = "AES-256-SHA";
600		break;
601	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
602		cipher = "DHE-RSA-AES-256-SHA";
603		break;
604	case TLS_DH_anon_WITH_AES_256_CBC_SHA:
605		cipher = "ADH-AES-256-SHA";
606		break;
607	case TLS_RSA_WITH_AES_128_CBC_SHA256:
608		cipher = "AES-128-SHA256";
609		break;
610	case TLS_RSA_WITH_AES_256_CBC_SHA256:
611		cipher = "AES-256-SHA256";
612		break;
613	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
614		cipher = "DHE-RSA-AES-128-SHA256";
615		break;
616	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
617		cipher = "DHE-RSA-AES-256-SHA256";
618		break;
619	case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
620		cipher = "ADH-AES-128-SHA256";
621		break;
622	case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
623		cipher = "ADH-AES-256-SHA256";
624		break;
625	default:
626		return -1;
627	}
628
629	if (os_strlcpy(buf, cipher, buflen) >= buflen)
630		return -1;
631	return 0;
632}
633
634
635/**
636 * tlsv1_client_shutdown - Shutdown TLS connection
637 * @conn: TLSv1 client connection data from tlsv1_client_init()
638 * Returns: 0 on success, -1 on failure
639 */
640int tlsv1_client_shutdown(struct tlsv1_client *conn)
641{
642	conn->state = CLIENT_HELLO;
643
644	if (tls_verify_hash_init(&conn->verify) < 0) {
645		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
646			   "hash");
647		return -1;
648	}
649
650	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
651	tlsv1_record_change_write_cipher(&conn->rl);
652	tlsv1_record_change_read_cipher(&conn->rl);
653
654	conn->certificate_requested = 0;
655	crypto_public_key_free(conn->server_rsa_key);
656	conn->server_rsa_key = NULL;
657	conn->session_resumed = 0;
658
659	return 0;
660}
661
662
663/**
664 * tlsv1_client_resumed - Was session resumption used
665 * @conn: TLSv1 client connection data from tlsv1_client_init()
666 * Returns: 1 if current session used session resumption, 0 if not
667 */
668int tlsv1_client_resumed(struct tlsv1_client *conn)
669{
670	return !!conn->session_resumed;
671}
672
673
674/**
675 * tlsv1_client_hello_ext - Set TLS extension for ClientHello
676 * @conn: TLSv1 client connection data from tlsv1_client_init()
677 * @ext_type: Extension type
678 * @data: Extension payload (%NULL to remove extension)
679 * @data_len: Extension payload length
680 * Returns: 0 on success, -1 on failure
681 */
682int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
683			   const u8 *data, size_t data_len)
684{
685	u8 *pos;
686
687	conn->session_ticket_included = 0;
688	os_free(conn->client_hello_ext);
689	conn->client_hello_ext = NULL;
690	conn->client_hello_ext_len = 0;
691
692	if (data == NULL || data_len == 0)
693		return 0;
694
695	pos = conn->client_hello_ext = os_malloc(4 + data_len);
696	if (pos == NULL)
697		return -1;
698
699	WPA_PUT_BE16(pos, ext_type);
700	pos += 2;
701	WPA_PUT_BE16(pos, data_len);
702	pos += 2;
703	os_memcpy(pos, data, data_len);
704	conn->client_hello_ext_len = 4 + data_len;
705
706	if (ext_type == TLS_EXT_PAC_OPAQUE) {
707		conn->session_ticket_included = 1;
708		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
709	}
710
711	return 0;
712}
713
714
715/**
716 * tlsv1_client_get_random - Get random data from TLS connection
717 * @conn: TLSv1 client connection data from tlsv1_client_init()
718 * @keys: Structure of random data (filled on success)
719 * Returns: 0 on success, -1 on failure
720 */
721int tlsv1_client_get_random(struct tlsv1_client *conn, struct tls_random *keys)
722{
723	os_memset(keys, 0, sizeof(*keys));
724	if (conn->state == CLIENT_HELLO)
725		return -1;
726
727	keys->client_random = conn->client_random;
728	keys->client_random_len = TLS_RANDOM_LEN;
729
730	if (conn->state != SERVER_HELLO) {
731		keys->server_random = conn->server_random;
732		keys->server_random_len = TLS_RANDOM_LEN;
733	}
734
735	return 0;
736}
737
738
739/**
740 * tlsv1_client_get_keyblock_size - Get TLS key_block size
741 * @conn: TLSv1 client connection data from tlsv1_client_init()
742 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
743 * failure
744 */
745int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
746{
747	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
748		return -1;
749
750	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
751		    conn->rl.iv_size);
752}
753
754
755/**
756 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
757 * @conn: TLSv1 client connection data from tlsv1_client_init()
758 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
759 * (TLS_CIPHER_*).
760 * Returns: 0 on success, -1 on failure
761 */
762int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
763{
764	size_t count;
765	u16 *suites;
766
767	/* TODO: implement proper configuration of cipher suites */
768	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
769		count = 0;
770		suites = conn->cipher_suites;
771		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
772		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
773		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
774		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
775		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
776		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
777		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
778
779		/*
780		 * Cisco AP (at least 350 and 1200 series) local authentication
781		 * server does not know how to search cipher suites from the
782		 * list and seem to require that the last entry in the list is
783		 * the one that it wants to use. However, TLS specification
784		 * requires the list to be in the client preference order. As a
785		 * workaround, add anon-DH AES-128-SHA1 again at the end of the
786		 * list to allow the Cisco code to find it.
787		 */
788		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
789		conn->num_cipher_suites = count;
790	}
791
792	return 0;
793}
794
795
796/**
797 * tlsv1_client_set_cred - Set client credentials
798 * @conn: TLSv1 client connection data from tlsv1_client_init()
799 * @cred: Credentials from tlsv1_cred_alloc()
800 * Returns: 0 on success, -1 on failure
801 *
802 * On success, the client takes ownership of the credentials block and caller
803 * must not free it. On failure, caller is responsible for freeing the
804 * credential block.
805 */
806int tlsv1_client_set_cred(struct tlsv1_client *conn,
807			  struct tlsv1_credentials *cred)
808{
809	tlsv1_cred_free(conn->cred);
810	conn->cred = cred;
811	return 0;
812}
813
814
815/**
816 * tlsv1_client_set_flags - Set connection flags
817 * @conn: TLSv1 client connection data from tlsv1_client_init()
818 * @flags: TLS_CONN_* bitfield
819 */
820void tlsv1_client_set_flags(struct tlsv1_client *conn, unsigned int flags)
821{
822	conn->flags = flags;
823}
824
825
826void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
827					tlsv1_client_session_ticket_cb cb,
828					void *ctx)
829{
830	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
831		   cb, ctx);
832	conn->session_ticket_cb = cb;
833	conn->session_ticket_cb_ctx = ctx;
834}
835
836
837void tlsv1_client_set_cb(struct tlsv1_client *conn,
838			 void (*event_cb)(void *ctx, enum tls_event ev,
839					  union tls_event_data *data),
840			 void *cb_ctx,
841			 int cert_in_cb)
842{
843	conn->event_cb = event_cb;
844	conn->cb_ctx = cb_ctx;
845	conn->cert_in_cb = !!cert_in_cb;
846}
847
848
849int tlsv1_client_get_version(struct tlsv1_client *conn, char *buf,
850			     size_t buflen)
851{
852	if (!conn)
853		return -1;
854	switch (conn->rl.tls_version) {
855	case TLS_VERSION_1:
856		os_strlcpy(buf, "TLSv1", buflen);
857		break;
858	case TLS_VERSION_1_1:
859		os_strlcpy(buf, "TLSv1.1", buflen);
860		break;
861	case TLS_VERSION_1_2:
862		os_strlcpy(buf, "TLSv1.2", buflen);
863		break;
864	default:
865		return -1;
866	}
867
868	return 0;
869}
870