Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / tls / tlsv1_server.c
CommitLineData
a875087d 1/*
4781064b
JM
2 * TLS v1.0/v1.1/v1.2 server (RFC 2246, RFC 4346, RFC 5246)
3 * Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
a875087d 4 *
4781064b
JM
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
a875087d
JL
7 */
8
9#include "includes.h"
10
11#include "common.h"
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JM
12#include "crypto/sha1.h"
13#include "crypto/tls.h"
a875087d
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14#include "tlsv1_common.h"
15#include "tlsv1_record.h"
16#include "tlsv1_server.h"
17#include "tlsv1_server_i.h"
18
19/* TODO:
20 * Support for a message fragmented across several records (RFC 2246, 6.2.1)
21 */
22
23
24void tlsv1_server_alert(struct tlsv1_server *conn, u8 level, u8 description)
25{
26 conn->alert_level = level;
27 conn->alert_description = description;
28}
29
30
31int tlsv1_server_derive_keys(struct tlsv1_server *conn,
32 const u8 *pre_master_secret,
33 size_t pre_master_secret_len)
34{
35 u8 seed[2 * TLS_RANDOM_LEN];
36 u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
37 u8 *pos;
38 size_t key_block_len;
39
40 if (pre_master_secret) {
41 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
42 pre_master_secret, pre_master_secret_len);
43 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
44 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
45 TLS_RANDOM_LEN);
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46 if (tls_prf(conn->rl.tls_version,
47 pre_master_secret, pre_master_secret_len,
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48 "master secret", seed, 2 * TLS_RANDOM_LEN,
49 conn->master_secret, TLS_MASTER_SECRET_LEN)) {
50 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
51 "master_secret");
52 return -1;
53 }
54 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
55 conn->master_secret, TLS_MASTER_SECRET_LEN);
56 }
57
58 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
59 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
60 key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len +
61 conn->rl.iv_size);
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62 if (tls_prf(conn->rl.tls_version,
63 conn->master_secret, TLS_MASTER_SECRET_LEN,
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64 "key expansion", seed, 2 * TLS_RANDOM_LEN,
65 key_block, key_block_len)) {
66 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
67 return -1;
68 }
69 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
70 key_block, key_block_len);
71
72 pos = key_block;
73
74 /* client_write_MAC_secret */
75 os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
76 pos += conn->rl.hash_size;
77 /* server_write_MAC_secret */
78 os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
79 pos += conn->rl.hash_size;
80
81 /* client_write_key */
82 os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
83 pos += conn->rl.key_material_len;
84 /* server_write_key */
85 os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
86 pos += conn->rl.key_material_len;
87
88 /* client_write_IV */
89 os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
90 pos += conn->rl.iv_size;
91 /* server_write_IV */
92 os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
93 pos += conn->rl.iv_size;
94
95 return 0;
96}
97
98
99/**
100 * tlsv1_server_handshake - Process TLS handshake
101 * @conn: TLSv1 server connection data from tlsv1_server_init()
102 * @in_data: Input data from TLS peer
103 * @in_len: Input data length
104 * @out_len: Length of the output buffer.
105 * Returns: Pointer to output data, %NULL on failure
106 */
107u8 * tlsv1_server_handshake(struct tlsv1_server *conn,
108 const u8 *in_data, size_t in_len,
109 size_t *out_len)
110{
111 const u8 *pos, *end;
112 u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct;
113 size_t in_msg_len;
4781064b 114 int used;
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115
116 if (in_data == NULL || in_len == 0) {
117 wpa_printf(MSG_DEBUG, "TLSv1: No input data to server");
118 return NULL;
119 }
120
121 pos = in_data;
122 end = in_data + in_len;
123 in_msg = os_malloc(in_len);
124 if (in_msg == NULL)
125 return NULL;
126
127 /* Each received packet may include multiple records */
128 while (pos < end) {
129 in_msg_len = in_len;
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130 used = tlsv1_record_receive(&conn->rl, pos, end - pos,
131 in_msg, &in_msg_len, &alert);
132 if (used < 0) {
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133 wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
134 "record failed");
135 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
136 goto failed;
137 }
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138 if (used == 0) {
139 /* need more data */
140 wpa_printf(MSG_DEBUG, "TLSv1: Partial processing not "
141 "yet supported");
142 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
143 goto failed;
144 }
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145 ct = pos[0];
146
147 in_pos = in_msg;
148 in_end = in_msg + in_msg_len;
149
150 /* Each received record may include multiple messages of the
151 * same ContentType. */
152 while (in_pos < in_end) {
153 in_msg_len = in_end - in_pos;
154 if (tlsv1_server_process_handshake(conn, ct, in_pos,
155 &in_msg_len) < 0)
156 goto failed;
157 in_pos += in_msg_len;
158 }
159
4781064b 160 pos += used;
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161 }
162
163 os_free(in_msg);
164 in_msg = NULL;
165
166 msg = tlsv1_server_handshake_write(conn, out_len);
167
168failed:
169 os_free(in_msg);
170 if (conn->alert_level) {
171 if (conn->state == FAILED) {
172 /* Avoid alert loops */
173 wpa_printf(MSG_DEBUG, "TLSv1: Drop alert loop");
174 os_free(msg);
175 return NULL;
176 }
177 conn->state = FAILED;
178 os_free(msg);
179 msg = tlsv1_server_send_alert(conn, conn->alert_level,
180 conn->alert_description,
181 out_len);
182 }
183
184 return msg;
185}
186
187
188/**
189 * tlsv1_server_encrypt - Encrypt data into TLS tunnel
190 * @conn: TLSv1 server connection data from tlsv1_server_init()
191 * @in_data: Pointer to plaintext data to be encrypted
192 * @in_len: Input buffer length
193 * @out_data: Pointer to output buffer (encrypted TLS data)
194 * @out_len: Maximum out_data length
195 * Returns: Number of bytes written to out_data, -1 on failure
196 *
197 * This function is used after TLS handshake has been completed successfully to
198 * send data in the encrypted tunnel.
199 */
200int tlsv1_server_encrypt(struct tlsv1_server *conn,
201 const u8 *in_data, size_t in_len,
202 u8 *out_data, size_t out_len)
203{
204 size_t rlen;
205
206 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
207 in_data, in_len);
208
a875087d 209 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
4781064b 210 out_data, out_len, in_data, in_len, &rlen) < 0) {
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211 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
212 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
213 TLS_ALERT_INTERNAL_ERROR);
214 return -1;
215 }
216
217 return rlen;
218}
219
220
221/**
222 * tlsv1_server_decrypt - Decrypt data from TLS tunnel
223 * @conn: TLSv1 server connection data from tlsv1_server_init()
224 * @in_data: Pointer to input buffer (encrypted TLS data)
225 * @in_len: Input buffer length
226 * @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
227 * @out_len: Maximum out_data length
228 * Returns: Number of bytes written to out_data, -1 on failure
229 *
230 * This function is used after TLS handshake has been completed successfully to
231 * receive data from the encrypted tunnel.
232 */
233int tlsv1_server_decrypt(struct tlsv1_server *conn,
234 const u8 *in_data, size_t in_len,
235 u8 *out_data, size_t out_len)
236{
237 const u8 *in_end, *pos;
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238 int used;
239 u8 alert, *out_end, *out_pos, ct;
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240 size_t olen;
241
242 pos = in_data;
243 in_end = in_data + in_len;
244 out_pos = out_data;
245 out_end = out_data + out_len;
246
247 while (pos < in_end) {
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248 ct = pos[0];
249 olen = out_end - out_pos;
250 used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
251 out_pos, &olen, &alert);
252 if (used < 0) {
253 wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
254 "failed");
255 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
256 return -1;
257 }
258 if (used == 0) {
259 /* need more data */
260 wpa_printf(MSG_DEBUG, "TLSv1: Partial processing not "
261 "yet supported");
262 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
263 return -1;
264 }
265
266 if (ct == TLS_CONTENT_TYPE_ALERT) {
267 if (olen < 2) {
268 wpa_printf(MSG_DEBUG, "TLSv1: Alert "
269 "underflow");
270 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
271 TLS_ALERT_DECODE_ERROR);
272 return -1;
273 }
274 wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
275 out_pos[0], out_pos[1]);
276 if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
277 /* Continue processing */
278 pos += used;
279 continue;
280 }
281
282 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
283 out_pos[1]);
284 return -1;
285 }
286
287 if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
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288 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
289 "0x%x", pos[0]);
290 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
291 TLS_ALERT_UNEXPECTED_MESSAGE);
292 return -1;
293 }
294
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295 out_pos += olen;
296 if (out_pos > out_end) {
297 wpa_printf(MSG_DEBUG, "TLSv1: Buffer not large enough "
298 "for processing the received record");
299 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
300 TLS_ALERT_INTERNAL_ERROR);
301 return -1;
302 }
303
4781064b 304 pos += used;
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305 }
306
307 return out_pos - out_data;
308}
309
310
311/**
312 * tlsv1_server_global_init - Initialize TLSv1 server
313 * Returns: 0 on success, -1 on failure
314 *
315 * This function must be called before using any other TLSv1 server functions.
316 */
317int tlsv1_server_global_init(void)
318{
319 return crypto_global_init();
320}
321
322
323/**
324 * tlsv1_server_global_deinit - Deinitialize TLSv1 server
325 *
326 * This function can be used to deinitialize the TLSv1 server that was
327 * initialized by calling tlsv1_server_global_init(). No TLSv1 server functions
328 * can be called after this before calling tlsv1_server_global_init() again.
329 */
330void tlsv1_server_global_deinit(void)
331{
332 crypto_global_deinit();
333}
334
335
336/**
337 * tlsv1_server_init - Initialize TLSv1 server connection
338 * @cred: Pointer to server credentials from tlsv1_server_cred_alloc()
339 * Returns: Pointer to TLSv1 server connection data or %NULL on failure
340 */
341struct tlsv1_server * tlsv1_server_init(struct tlsv1_credentials *cred)
342{
343 struct tlsv1_server *conn;
344 size_t count;
345 u16 *suites;
346
347 conn = os_zalloc(sizeof(*conn));
348 if (conn == NULL)
349 return NULL;
350
351 conn->cred = cred;
352
353 conn->state = CLIENT_HELLO;
354
355 if (tls_verify_hash_init(&conn->verify) < 0) {
356 wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
357 "hash");
358 os_free(conn);
359 return NULL;
360 }
361
362 count = 0;
363 suites = conn->cipher_suites;
a875087d 364 suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
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365 suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
366 suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
367 suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
368 suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
369 conn->num_cipher_suites = count;
370
371 return conn;
372}
373
374
375static void tlsv1_server_clear_data(struct tlsv1_server *conn)
376{
377 tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
378 tlsv1_record_change_write_cipher(&conn->rl);
379 tlsv1_record_change_read_cipher(&conn->rl);
380 tls_verify_hash_free(&conn->verify);
381
382 crypto_public_key_free(conn->client_rsa_key);
383 conn->client_rsa_key = NULL;
384
385 os_free(conn->session_ticket);
386 conn->session_ticket = NULL;
387 conn->session_ticket_len = 0;
388 conn->use_session_ticket = 0;
389
390 os_free(conn->dh_secret);
391 conn->dh_secret = NULL;
392 conn->dh_secret_len = 0;
393}
394
395
396/**
397 * tlsv1_server_deinit - Deinitialize TLSv1 server connection
398 * @conn: TLSv1 server connection data from tlsv1_server_init()
399 */
400void tlsv1_server_deinit(struct tlsv1_server *conn)
401{
402 tlsv1_server_clear_data(conn);
403 os_free(conn);
404}
405
406
407/**
408 * tlsv1_server_established - Check whether connection has been established
409 * @conn: TLSv1 server connection data from tlsv1_server_init()
410 * Returns: 1 if connection is established, 0 if not
411 */
412int tlsv1_server_established(struct tlsv1_server *conn)
413{
414 return conn->state == ESTABLISHED;
415}
416
417
418/**
419 * tlsv1_server_prf - Use TLS-PRF to derive keying material
420 * @conn: TLSv1 server connection data from tlsv1_server_init()
421 * @label: Label (e.g., description of the key) for PRF
422 * @server_random_first: seed is 0 = client_random|server_random,
423 * 1 = server_random|client_random
424 * @out: Buffer for output data from TLS-PRF
425 * @out_len: Length of the output buffer
426 * Returns: 0 on success, -1 on failure
427 */
428int tlsv1_server_prf(struct tlsv1_server *conn, const char *label,
429 int server_random_first, u8 *out, size_t out_len)
430{
431 u8 seed[2 * TLS_RANDOM_LEN];
432
433 if (conn->state != ESTABLISHED)
434 return -1;
435
436 if (server_random_first) {
437 os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
438 os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
439 TLS_RANDOM_LEN);
440 } else {
441 os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
442 os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
443 TLS_RANDOM_LEN);
444 }
445
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446 return tls_prf(conn->rl.tls_version,
447 conn->master_secret, TLS_MASTER_SECRET_LEN,
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448 label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
449}
450
451
452/**
453 * tlsv1_server_get_cipher - Get current cipher name
454 * @conn: TLSv1 server connection data from tlsv1_server_init()
455 * @buf: Buffer for the cipher name
456 * @buflen: buf size
457 * Returns: 0 on success, -1 on failure
458 *
459 * Get the name of the currently used cipher.
460 */
461int tlsv1_server_get_cipher(struct tlsv1_server *conn, char *buf,
462 size_t buflen)
463{
464 char *cipher;
465
466 switch (conn->rl.cipher_suite) {
467 case TLS_RSA_WITH_RC4_128_MD5:
468 cipher = "RC4-MD5";
469 break;
470 case TLS_RSA_WITH_RC4_128_SHA:
471 cipher = "RC4-SHA";
472 break;
473 case TLS_RSA_WITH_DES_CBC_SHA:
474 cipher = "DES-CBC-SHA";
475 break;
476 case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
477 cipher = "DES-CBC3-SHA";
478 break;
479 case TLS_DH_anon_WITH_AES_128_CBC_SHA:
480 cipher = "ADH-AES-128-SHA";
481 break;
482 case TLS_RSA_WITH_AES_256_CBC_SHA:
483 cipher = "AES-256-SHA";
484 break;
485 case TLS_RSA_WITH_AES_128_CBC_SHA:
486 cipher = "AES-128-SHA";
487 break;
488 default:
489 return -1;
490 }
491
492 if (os_strlcpy(buf, cipher, buflen) >= buflen)
493 return -1;
494 return 0;
495}
496
497
498/**
499 * tlsv1_server_shutdown - Shutdown TLS connection
500 * @conn: TLSv1 server connection data from tlsv1_server_init()
501 * Returns: 0 on success, -1 on failure
502 */
503int tlsv1_server_shutdown(struct tlsv1_server *conn)
504{
505 conn->state = CLIENT_HELLO;
506
507 if (tls_verify_hash_init(&conn->verify) < 0) {
508 wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
509 "hash");
510 return -1;
511 }
512
513 tlsv1_server_clear_data(conn);
514
515 return 0;
516}
517
518
519/**
520 * tlsv1_server_resumed - Was session resumption used
521 * @conn: TLSv1 server connection data from tlsv1_server_init()
522 * Returns: 1 if current session used session resumption, 0 if not
523 */
524int tlsv1_server_resumed(struct tlsv1_server *conn)
525{
526 return 0;
527}
528
529
530/**
531 * tlsv1_server_get_keys - Get master key and random data from TLS connection
532 * @conn: TLSv1 server connection data from tlsv1_server_init()
533 * @keys: Structure of key/random data (filled on success)
534 * Returns: 0 on success, -1 on failure
535 */
536int tlsv1_server_get_keys(struct tlsv1_server *conn, struct tls_keys *keys)
537{
538 os_memset(keys, 0, sizeof(*keys));
539 if (conn->state == CLIENT_HELLO)
540 return -1;
541
542 keys->client_random = conn->client_random;
543 keys->client_random_len = TLS_RANDOM_LEN;
544
545 if (conn->state != SERVER_HELLO) {
546 keys->server_random = conn->server_random;
547 keys->server_random_len = TLS_RANDOM_LEN;
548 keys->master_key = conn->master_secret;
549 keys->master_key_len = TLS_MASTER_SECRET_LEN;
550 }
551
552 return 0;
553}
554
555
556/**
557 * tlsv1_server_get_keyblock_size - Get TLS key_block size
558 * @conn: TLSv1 server connection data from tlsv1_server_init()
559 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
560 * failure
561 */
562int tlsv1_server_get_keyblock_size(struct tlsv1_server *conn)
563{
564 if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
565 return -1;
566
567 return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
568 conn->rl.iv_size);
569}
570
571
572/**
573 * tlsv1_server_set_cipher_list - Configure acceptable cipher suites
574 * @conn: TLSv1 server connection data from tlsv1_server_init()
575 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
576 * (TLS_CIPHER_*).
577 * Returns: 0 on success, -1 on failure
578 */
579int tlsv1_server_set_cipher_list(struct tlsv1_server *conn, u8 *ciphers)
580{
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581 size_t count;
582 u16 *suites;
583
584 /* TODO: implement proper configuration of cipher suites */
585 if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
586 count = 0;
587 suites = conn->cipher_suites;
a875087d 588 suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
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JL
589 suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
590 suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
591 suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
592 suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
a875087d 593 suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
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594 suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
595 suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
596 suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
597 suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
598 conn->num_cipher_suites = count;
599 }
600
601 return 0;
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JL
602}
603
604
605int tlsv1_server_set_verify(struct tlsv1_server *conn, int verify_peer)
606{
607 conn->verify_peer = verify_peer;
608 return 0;
609}
610
611
612void tlsv1_server_set_session_ticket_cb(struct tlsv1_server *conn,
613 tlsv1_server_session_ticket_cb cb,
614 void *ctx)
615{
616 wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
617 cb, ctx);
618 conn->session_ticket_cb = cb;
619 conn->session_ticket_cb_ctx = ctx;
620}