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
tls_alert(struct tlsv1_client * conn,u8 level,u8 description)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
tlsv1_client_free_dh(struct tlsv1_client * conn)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
tls_derive_pre_master_secret(u8 * pre_master_secret)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
tls_derive_keys(struct tlsv1_client * conn,const u8 * pre_master_secret,size_t pre_master_secret_len)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 */
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)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 */
tlsv1_client_encrypt(struct tlsv1_client * conn,const u8 * in_data,size_t in_len,u8 * out_data,size_t out_len)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 */
tlsv1_client_decrypt(struct tlsv1_client * conn,const u8 * in_data,size_t in_len,int * need_more_data)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 */
tlsv1_client_global_init(void)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 */
tlsv1_client_global_deinit(void)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 */
tlsv1_client_init(void)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 */
tlsv1_client_deinit(struct tlsv1_client * conn)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 */
tlsv1_client_established(struct tlsv1_client * conn)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 */
tlsv1_client_prf(struct tlsv1_client * conn,const char * label,int server_random_first,u8 * out,size_t out_len)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 */
tlsv1_client_get_cipher(struct tlsv1_client * conn,char * buf,size_t buflen)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 */
tlsv1_client_shutdown(struct tlsv1_client * conn)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 */
tlsv1_client_resumed(struct tlsv1_client * conn)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 */
tlsv1_client_hello_ext(struct tlsv1_client * conn,int ext_type,const u8 * data,size_t data_len)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 */
tlsv1_client_get_keys(struct tlsv1_client * conn,struct tls_keys * keys)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 }
735
736 return 0;
737 }
738
739
740 /**
741 * tlsv1_client_get_keyblock_size - Get TLS key_block size
742 * @conn: TLSv1 client connection data from tlsv1_client_init()
743 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
744 * failure
745 */
tlsv1_client_get_keyblock_size(struct tlsv1_client * conn)746 int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
747 {
748 if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
749 return -1;
750
751 return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
752 conn->rl.iv_size);
753 }
754
755
756 /**
757 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
758 * @conn: TLSv1 client connection data from tlsv1_client_init()
759 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
760 * (TLS_CIPHER_*).
761 * Returns: 0 on success, -1 on failure
762 */
tlsv1_client_set_cipher_list(struct tlsv1_client * conn,u8 * ciphers)763 int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
764 {
765 size_t count;
766 u16 *suites;
767
768 /* TODO: implement proper configuration of cipher suites */
769 if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
770 count = 0;
771 suites = conn->cipher_suites;
772 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
773 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
774 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
775 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
776 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
777 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
778 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
779
780 /*
781 * Cisco AP (at least 350 and 1200 series) local authentication
782 * server does not know how to search cipher suites from the
783 * list and seem to require that the last entry in the list is
784 * the one that it wants to use. However, TLS specification
785 * requires the list to be in the client preference order. As a
786 * workaround, add anon-DH AES-128-SHA1 again at the end of the
787 * list to allow the Cisco code to find it.
788 */
789 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
790 conn->num_cipher_suites = count;
791 }
792
793 return 0;
794 }
795
796
797 /**
798 * tlsv1_client_set_cred - Set client credentials
799 * @conn: TLSv1 client connection data from tlsv1_client_init()
800 * @cred: Credentials from tlsv1_cred_alloc()
801 * Returns: 0 on success, -1 on failure
802 *
803 * On success, the client takes ownership of the credentials block and caller
804 * must not free it. On failure, caller is responsible for freeing the
805 * credential block.
806 */
tlsv1_client_set_cred(struct tlsv1_client * conn,struct tlsv1_credentials * cred)807 int tlsv1_client_set_cred(struct tlsv1_client *conn,
808 struct tlsv1_credentials *cred)
809 {
810 tlsv1_cred_free(conn->cred);
811 conn->cred = cred;
812 return 0;
813 }
814
815
tlsv1_client_set_time_checks(struct tlsv1_client * conn,int enabled)816 void tlsv1_client_set_time_checks(struct tlsv1_client *conn, int enabled)
817 {
818 conn->disable_time_checks = !enabled;
819 }
820
821
tlsv1_client_set_session_ticket_cb(struct tlsv1_client * conn,tlsv1_client_session_ticket_cb cb,void * ctx)822 void tlsv1_client_set_session_ticket_cb(struct tlsv1_client *conn,
823 tlsv1_client_session_ticket_cb cb,
824 void *ctx)
825 {
826 wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
827 cb, ctx);
828 conn->session_ticket_cb = cb;
829 conn->session_ticket_cb_ctx = ctx;
830 }
831