xref: /freebsd/contrib/wpa/src/tls/tlsv1_client.c (revision ef0cb5db0af0d5d5b75b74f8e534fe601b7176d7)
1 /*
2  * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
3  * Copyright (c) 2006-2014, 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 
24 void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
25 {
26 	conn->alert_level = level;
27 	conn->alert_description = description;
28 }
29 
30 
31 void 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 
40 int 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 
50 int 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  */
139 u8 * 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 
237 failed:
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  */
273 int 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  */
306 struct 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 
403 fail:
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  */
418 int 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  */
431 void 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  */
441 struct 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  */
486 void 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 	os_free(conn);
498 }
499 
500 
501 /**
502  * tlsv1_client_established - Check whether connection has been established
503  * @conn: TLSv1 client connection data from tlsv1_client_init()
504  * Returns: 1 if connection is established, 0 if not
505  */
506 int tlsv1_client_established(struct tlsv1_client *conn)
507 {
508 	return conn->state == ESTABLISHED;
509 }
510 
511 
512 /**
513  * tlsv1_client_prf - Use TLS-PRF to derive keying material
514  * @conn: TLSv1 client connection data from tlsv1_client_init()
515  * @label: Label (e.g., description of the key) for PRF
516  * @server_random_first: seed is 0 = client_random|server_random,
517  * 1 = server_random|client_random
518  * @out: Buffer for output data from TLS-PRF
519  * @out_len: Length of the output buffer
520  * Returns: 0 on success, -1 on failure
521  */
522 int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
523 		     int server_random_first, u8 *out, size_t out_len)
524 {
525 	u8 seed[2 * TLS_RANDOM_LEN];
526 
527 	if (conn->state != ESTABLISHED)
528 		return -1;
529 
530 	if (server_random_first) {
531 		os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
532 		os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
533 			  TLS_RANDOM_LEN);
534 	} else {
535 		os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
536 		os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
537 			  TLS_RANDOM_LEN);
538 	}
539 
540 	return tls_prf(conn->rl.tls_version,
541 		       conn->master_secret, TLS_MASTER_SECRET_LEN,
542 		       label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
543 }
544 
545 
546 /**
547  * tlsv1_client_get_cipher - Get current cipher name
548  * @conn: TLSv1 client connection data from tlsv1_client_init()
549  * @buf: Buffer for the cipher name
550  * @buflen: buf size
551  * Returns: 0 on success, -1 on failure
552  *
553  * Get the name of the currently used cipher.
554  */
555 int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
556 			    size_t buflen)
557 {
558 	char *cipher;
559 
560 	switch (conn->rl.cipher_suite) {
561 	case TLS_RSA_WITH_RC4_128_MD5:
562 		cipher = "RC4-MD5";
563 		break;
564 	case TLS_RSA_WITH_RC4_128_SHA:
565 		cipher = "RC4-SHA";
566 		break;
567 	case TLS_RSA_WITH_DES_CBC_SHA:
568 		cipher = "DES-CBC-SHA";
569 		break;
570 	case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
571 		cipher = "DES-CBC3-SHA";
572 		break;
573 	case TLS_DHE_RSA_WITH_DES_CBC_SHA:
574 		cipher = "DHE-RSA-DES-CBC-SHA";
575 		break;
576 	case TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA:
577 		cipher = "DHE-RSA-DES-CBC3-SHA";
578 		break;
579 	case TLS_DH_anon_WITH_RC4_128_MD5:
580 		cipher = "ADH-RC4-MD5";
581 		break;
582 	case TLS_DH_anon_WITH_DES_CBC_SHA:
583 		cipher = "ADH-DES-SHA";
584 		break;
585 	case TLS_DH_anon_WITH_3DES_EDE_CBC_SHA:
586 		cipher = "ADH-DES-CBC3-SHA";
587 		break;
588 	case TLS_RSA_WITH_AES_128_CBC_SHA:
589 		cipher = "AES-128-SHA";
590 		break;
591 	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA:
592 		cipher = "DHE-RSA-AES-128-SHA";
593 		break;
594 	case TLS_DH_anon_WITH_AES_128_CBC_SHA:
595 		cipher = "ADH-AES-128-SHA";
596 		break;
597 	case TLS_RSA_WITH_AES_256_CBC_SHA:
598 		cipher = "AES-256-SHA";
599 		break;
600 	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA:
601 		cipher = "DHE-RSA-AES-256-SHA";
602 		break;
603 	case TLS_DH_anon_WITH_AES_256_CBC_SHA:
604 		cipher = "ADH-AES-256-SHA";
605 		break;
606 	case TLS_RSA_WITH_AES_128_CBC_SHA256:
607 		cipher = "AES-128-SHA256";
608 		break;
609 	case TLS_RSA_WITH_AES_256_CBC_SHA256:
610 		cipher = "AES-256-SHA256";
611 		break;
612 	case TLS_DHE_RSA_WITH_AES_128_CBC_SHA256:
613 		cipher = "DHE-RSA-AES-128-SHA256";
614 		break;
615 	case TLS_DHE_RSA_WITH_AES_256_CBC_SHA256:
616 		cipher = "DHE-RSA-AES-256-SHA256";
617 		break;
618 	case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
619 		cipher = "ADH-AES-128-SHA256";
620 		break;
621 	case TLS_DH_anon_WITH_AES_256_CBC_SHA256:
622 		cipher = "ADH-AES-256-SHA256";
623 		break;
624 	default:
625 		return -1;
626 	}
627 
628 	if (os_strlcpy(buf, cipher, buflen) >= buflen)
629 		return -1;
630 	return 0;
631 }
632 
633 
634 /**
635  * tlsv1_client_shutdown - Shutdown TLS connection
636  * @conn: TLSv1 client connection data from tlsv1_client_init()
637  * Returns: 0 on success, -1 on failure
638  */
639 int tlsv1_client_shutdown(struct tlsv1_client *conn)
640 {
641 	conn->state = CLIENT_HELLO;
642 
643 	if (tls_verify_hash_init(&conn->verify) < 0) {
644 		wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
645 			   "hash");
646 		return -1;
647 	}
648 
649 	tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
650 	tlsv1_record_change_write_cipher(&conn->rl);
651 	tlsv1_record_change_read_cipher(&conn->rl);
652 
653 	conn->certificate_requested = 0;
654 	crypto_public_key_free(conn->server_rsa_key);
655 	conn->server_rsa_key = NULL;
656 	conn->session_resumed = 0;
657 
658 	return 0;
659 }
660 
661 
662 /**
663  * tlsv1_client_resumed - Was session resumption used
664  * @conn: TLSv1 client connection data from tlsv1_client_init()
665  * Returns: 1 if current session used session resumption, 0 if not
666  */
667 int tlsv1_client_resumed(struct tlsv1_client *conn)
668 {
669 	return !!conn->session_resumed;
670 }
671 
672 
673 /**
674  * tlsv1_client_hello_ext - Set TLS extension for ClientHello
675  * @conn: TLSv1 client connection data from tlsv1_client_init()
676  * @ext_type: Extension type
677  * @data: Extension payload (%NULL to remove extension)
678  * @data_len: Extension payload length
679  * Returns: 0 on success, -1 on failure
680  */
681 int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
682 			   const u8 *data, size_t data_len)
683 {
684 	u8 *pos;
685 
686 	conn->session_ticket_included = 0;
687 	os_free(conn->client_hello_ext);
688 	conn->client_hello_ext = NULL;
689 	conn->client_hello_ext_len = 0;
690 
691 	if (data == NULL || data_len == 0)
692 		return 0;
693 
694 	pos = conn->client_hello_ext = os_malloc(6 + data_len);
695 	if (pos == NULL)
696 		return -1;
697 
698 	WPA_PUT_BE16(pos, 4 + data_len);
699 	pos += 2;
700 	WPA_PUT_BE16(pos, ext_type);
701 	pos += 2;
702 	WPA_PUT_BE16(pos, data_len);
703 	pos += 2;
704 	os_memcpy(pos, data, data_len);
705 	conn->client_hello_ext_len = 6 + data_len;
706 
707 	if (ext_type == TLS_EXT_PAC_OPAQUE) {
708 		conn->session_ticket_included = 1;
709 		wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
710 	}
711 
712 	return 0;
713 }
714 
715 
716 /**
717  * tlsv1_client_get_keys - Get master key and random data from TLS connection
718  * @conn: TLSv1 client connection data from tlsv1_client_init()
719  * @keys: Structure of key/random data (filled on success)
720  * Returns: 0 on success, -1 on failure
721  */
722 int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
723 {
724 	os_memset(keys, 0, sizeof(*keys));
725 	if (conn->state == CLIENT_HELLO)
726 		return -1;
727 
728 	keys->client_random = conn->client_random;
729 	keys->client_random_len = TLS_RANDOM_LEN;
730 
731 	if (conn->state != SERVER_HELLO) {
732 		keys->server_random = conn->server_random;
733 		keys->server_random_len = TLS_RANDOM_LEN;
734 		keys->master_key = conn->master_secret;
735 		keys->master_key_len = TLS_MASTER_SECRET_LEN;
736 	}
737 
738 	return 0;
739 }
740 
741 
742 /**
743  * tlsv1_client_get_keyblock_size - Get TLS key_block size
744  * @conn: TLSv1 client connection data from tlsv1_client_init()
745  * Returns: Size of the key_block for the negotiated cipher suite or -1 on
746  * failure
747  */
748 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
749 {
750 	if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
751 		return -1;
752 
753 	return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
754 		    conn->rl.iv_size);
755 }
756 
757 
758 /**
759  * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
760  * @conn: TLSv1 client connection data from tlsv1_client_init()
761  * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
762  * (TLS_CIPHER_*).
763  * Returns: 0 on success, -1 on failure
764  */
765 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
766 {
767 	size_t count;
768 	u16 *suites;
769 
770 	/* TODO: implement proper configuration of cipher suites */
771 	if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
772 		count = 0;
773 		suites = conn->cipher_suites;
774 		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
775 		suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
776 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
777 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
778 		suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
779 		suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
780 		suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
781 
782 		/*
783 		 * Cisco AP (at least 350 and 1200 series) local authentication
784 		 * server does not know how to search cipher suites from the
785 		 * list and seem to require that the last entry in the list is
786 		 * the one that it wants to use. However, TLS specification
787 		 * requires the list to be in the client preference order. As a
788 		 * workaround, add anon-DH AES-128-SHA1 again at the end of the
789 		 * list to allow the Cisco code to find it.
790 		 */
791 		suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
792 		conn->num_cipher_suites = count;
793 	}
794 
795 	return 0;
796 }
797 
798 
799 /**
800  * tlsv1_client_set_cred - Set client credentials
801  * @conn: TLSv1 client connection data from tlsv1_client_init()
802  * @cred: Credentials from tlsv1_cred_alloc()
803  * Returns: 0 on success, -1 on failure
804  *
805  * On success, the client takes ownership of the credentials block and caller
806  * must not free it. On failure, caller is responsible for freeing the
807  * credential block.
808  */
809 int tlsv1_client_set_cred(struct tlsv1_client *conn,
810 			  struct tlsv1_credentials *cred)
811 {
812 	tlsv1_cred_free(conn->cred);
813 	conn->cred = cred;
814 	return 0;
815 }
816 
817 
818 void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
819 {
820 	conn->disable_time_checks = !enabled;
821 }
822 
823 
824 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
825 					tlsv1_client_session_ticket_cb cb,
826 					void *ctx)
827 {
828 	wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
829 		   cb, ctx);
830 	conn->session_ticket_cb = cb;
831 	conn->session_ticket_cb_ctx = ctx;
832 }
833