2
* SSLv3/TLSv1 shared functions
4
* Copyright (C) 2006-2010, Brainspark B.V.
6
* This file is part of PolarSSL (http://www.polarssl.org)
7
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
11
* This program is free software; you can redistribute it and/or modify
12
* it under the terms of the GNU General Public License as published by
13
* the Free Software Foundation; either version 2 of the License, or
14
* (at your option) any later version.
16
* This program is distributed in the hope that it will be useful,
17
* but WITHOUT ANY WARRANTY; without even the implied warranty of
18
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19
* GNU General Public License for more details.
21
* You should have received a copy of the GNU General Public License along
22
* with this program; if not, write to the Free Software Foundation, Inc.,
23
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26
* The SSL 3.0 specification was drafted by Netscape in 1996,
27
* and became an IETF standard in 1999.
29
* http://wp.netscape.com/eng/ssl3/
30
* http://www.ietf.org/rfc/rfc2246.txt
31
* http://www.ietf.org/rfc/rfc4346.txt
34
#include "polarssl/config.h"
36
#if defined(POLARSSL_SSL_TLS_C)
38
#include "polarssl/aes.h"
39
#include "polarssl/arc4.h"
40
#include "polarssl/camellia.h"
41
#include "polarssl/des.h"
42
#include "polarssl/debug.h"
43
#include "polarssl/ssl.h"
48
#if defined _MSC_VER && !defined strcasecmp
49
#define strcasecmp _stricmp
53
* Key material generation
55
static int tls1_prf( unsigned char *secret, size_t slen, char *label,
56
unsigned char *random, size_t rlen,
57
unsigned char *dstbuf, size_t dlen )
61
unsigned char *S1, *S2;
62
unsigned char tmp[128];
63
unsigned char h_i[20];
65
if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
66
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
68
hs = ( slen + 1 ) / 2;
70
S2 = secret + slen - hs;
73
memcpy( tmp + 20, label, nb );
74
memcpy( tmp + 20 + nb, random, rlen );
78
* First compute P_md5(secret,label+random)[0..dlen]
80
md5_hmac( S1, hs, tmp + 20, nb, 4 + tmp );
82
for( i = 0; i < dlen; i += 16 )
84
md5_hmac( S1, hs, 4 + tmp, 16 + nb, h_i );
85
md5_hmac( S1, hs, 4 + tmp, 16, 4 + tmp );
87
k = ( i + 16 > dlen ) ? dlen % 16 : 16;
89
for( j = 0; j < k; j++ )
90
dstbuf[i + j] = h_i[j];
94
* XOR out with P_sha1(secret,label+random)[0..dlen]
96
sha1_hmac( S2, hs, tmp + 20, nb, tmp );
98
for( i = 0; i < dlen; i += 20 )
100
sha1_hmac( S2, hs, tmp, 20 + nb, h_i );
101
sha1_hmac( S2, hs, tmp, 20, tmp );
103
k = ( i + 20 > dlen ) ? dlen % 20 : 20;
105
for( j = 0; j < k; j++ )
106
dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
109
memset( tmp, 0, sizeof( tmp ) );
110
memset( h_i, 0, sizeof( h_i ) );
115
int ssl_derive_keys( ssl_context *ssl )
120
unsigned char tmp[64];
121
unsigned char padding[16];
122
unsigned char sha1sum[20];
123
unsigned char keyblk[256];
127
SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
132
* MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
133
* MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
134
* MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
137
* master = PRF( premaster, "master secret", randbytes )[0..47]
139
if( ssl->resume == 0 )
141
size_t len = ssl->pmslen;
143
SSL_DEBUG_BUF( 3, "premaster secret", ssl->premaster, len );
145
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
147
for( i = 0; i < 3; i++ )
149
memset( padding, 'A' + i, 1 + i );
151
sha1_starts( &sha1 );
152
sha1_update( &sha1, padding, 1 + i );
153
sha1_update( &sha1, ssl->premaster, len );
154
sha1_update( &sha1, ssl->randbytes, 64 );
155
sha1_finish( &sha1, sha1sum );
158
md5_update( &md5, ssl->premaster, len );
159
md5_update( &md5, sha1sum, 20 );
160
md5_finish( &md5, ssl->session->master + i * 16 );
164
tls1_prf( ssl->premaster, len, "master secret",
165
ssl->randbytes, 64, ssl->session->master, 48 );
167
memset( ssl->premaster, 0, sizeof( ssl->premaster ) );
170
SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
173
* Swap the client and server random values.
175
memcpy( tmp, ssl->randbytes, 64 );
176
memcpy( ssl->randbytes, tmp + 32, 32 );
177
memcpy( ssl->randbytes + 32, tmp, 32 );
178
memset( tmp, 0, sizeof( tmp ) );
183
* MD5( master + SHA1( 'A' + master + randbytes ) ) +
184
* MD5( master + SHA1( 'BB' + master + randbytes ) ) +
185
* MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
186
* MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
190
* key block = PRF( master, "key expansion", randbytes )
192
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
194
for( i = 0; i < 16; i++ )
196
memset( padding, 'A' + i, 1 + i );
198
sha1_starts( &sha1 );
199
sha1_update( &sha1, padding, 1 + i );
200
sha1_update( &sha1, ssl->session->master, 48 );
201
sha1_update( &sha1, ssl->randbytes, 64 );
202
sha1_finish( &sha1, sha1sum );
205
md5_update( &md5, ssl->session->master, 48 );
206
md5_update( &md5, sha1sum, 20 );
207
md5_finish( &md5, keyblk + i * 16 );
210
memset( &md5, 0, sizeof( md5 ) );
211
memset( &sha1, 0, sizeof( sha1 ) );
213
memset( padding, 0, sizeof( padding ) );
214
memset( sha1sum, 0, sizeof( sha1sum ) );
217
tls1_prf( ssl->session->master, 48, "key expansion",
218
ssl->randbytes, 64, keyblk, 256 );
220
SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", ssl_get_ciphersuite( ssl ) ) );
221
SSL_DEBUG_BUF( 3, "master secret", ssl->session->master, 48 );
222
SSL_DEBUG_BUF( 4, "random bytes", ssl->randbytes, 64 );
223
SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
225
memset( ssl->randbytes, 0, sizeof( ssl->randbytes ) );
228
* Determine the appropriate key, IV and MAC length.
230
switch( ssl->session->ciphersuite )
232
#if defined(POLARSSL_ARC4_C)
233
case SSL_RSA_RC4_128_MD5:
234
ssl->keylen = 16; ssl->minlen = 16;
235
ssl->ivlen = 0; ssl->maclen = 16;
238
case SSL_RSA_RC4_128_SHA:
239
ssl->keylen = 16; ssl->minlen = 20;
240
ssl->ivlen = 0; ssl->maclen = 20;
244
#if defined(POLARSSL_DES_C)
245
case SSL_RSA_DES_168_SHA:
246
case SSL_EDH_RSA_DES_168_SHA:
247
ssl->keylen = 24; ssl->minlen = 24;
248
ssl->ivlen = 8; ssl->maclen = 20;
252
#if defined(POLARSSL_AES_C)
253
case SSL_RSA_AES_128_SHA:
254
case SSL_EDH_RSA_AES_128_SHA:
255
ssl->keylen = 16; ssl->minlen = 32;
256
ssl->ivlen = 16; ssl->maclen = 20;
259
case SSL_RSA_AES_256_SHA:
260
case SSL_EDH_RSA_AES_256_SHA:
261
ssl->keylen = 32; ssl->minlen = 32;
262
ssl->ivlen = 16; ssl->maclen = 20;
266
#if defined(POLARSSL_CAMELLIA_C)
267
case SSL_RSA_CAMELLIA_128_SHA:
268
case SSL_EDH_RSA_CAMELLIA_128_SHA:
269
ssl->keylen = 16; ssl->minlen = 32;
270
ssl->ivlen = 16; ssl->maclen = 20;
273
case SSL_RSA_CAMELLIA_256_SHA:
274
case SSL_EDH_RSA_CAMELLIA_256_SHA:
275
ssl->keylen = 32; ssl->minlen = 32;
276
ssl->ivlen = 16; ssl->maclen = 20;
281
SSL_DEBUG_MSG( 1, ( "ciphersuite %s is not available",
282
ssl_get_ciphersuite( ssl ) ) );
283
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
286
SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
287
ssl->keylen, ssl->minlen, ssl->ivlen, ssl->maclen ) );
290
* Finally setup the cipher contexts, IVs and MAC secrets.
292
if( ssl->endpoint == SSL_IS_CLIENT )
294
key1 = keyblk + ssl->maclen * 2;
295
key2 = keyblk + ssl->maclen * 2 + ssl->keylen;
297
memcpy( ssl->mac_enc, keyblk, ssl->maclen );
298
memcpy( ssl->mac_dec, keyblk + ssl->maclen, ssl->maclen );
301
* This is not used in TLS v1.1.
303
memcpy( ssl->iv_enc, key2 + ssl->keylen, ssl->ivlen );
304
memcpy( ssl->iv_dec, key2 + ssl->keylen + ssl->ivlen,
309
key1 = keyblk + ssl->maclen * 2 + ssl->keylen;
310
key2 = keyblk + ssl->maclen * 2;
312
memcpy( ssl->mac_dec, keyblk, ssl->maclen );
313
memcpy( ssl->mac_enc, keyblk + ssl->maclen, ssl->maclen );
316
* This is not used in TLS v1.1.
318
memcpy( ssl->iv_dec, key1 + ssl->keylen, ssl->ivlen );
319
memcpy( ssl->iv_enc, key1 + ssl->keylen + ssl->ivlen,
323
switch( ssl->session->ciphersuite )
325
#if defined(POLARSSL_ARC4_C)
326
case SSL_RSA_RC4_128_MD5:
327
case SSL_RSA_RC4_128_SHA:
328
arc4_setup( (arc4_context *) ssl->ctx_enc, key1, ssl->keylen );
329
arc4_setup( (arc4_context *) ssl->ctx_dec, key2, ssl->keylen );
333
#if defined(POLARSSL_DES_C)
334
case SSL_RSA_DES_168_SHA:
335
case SSL_EDH_RSA_DES_168_SHA:
336
des3_set3key_enc( (des3_context *) ssl->ctx_enc, key1 );
337
des3_set3key_dec( (des3_context *) ssl->ctx_dec, key2 );
341
#if defined(POLARSSL_AES_C)
342
case SSL_RSA_AES_128_SHA:
343
case SSL_EDH_RSA_AES_128_SHA:
344
aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 128 );
345
aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 128 );
348
case SSL_RSA_AES_256_SHA:
349
case SSL_EDH_RSA_AES_256_SHA:
350
aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 256 );
351
aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 256 );
355
#if defined(POLARSSL_CAMELLIA_C)
356
case SSL_RSA_CAMELLIA_128_SHA:
357
case SSL_EDH_RSA_CAMELLIA_128_SHA:
358
camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 128 );
359
camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 128 );
362
case SSL_RSA_CAMELLIA_256_SHA:
363
case SSL_EDH_RSA_CAMELLIA_256_SHA:
364
camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 256 );
365
camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 256 );
370
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
373
memset( keyblk, 0, sizeof( keyblk ) );
375
SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
380
void ssl_calc_verify( ssl_context *ssl, unsigned char hash[36] )
384
unsigned char pad_1[48];
385
unsigned char pad_2[48];
387
SSL_DEBUG_MSG( 2, ( "=> calc verify" ) );
389
memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
390
memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
392
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
394
memset( pad_1, 0x36, 48 );
395
memset( pad_2, 0x5C, 48 );
397
md5_update( &md5, ssl->session->master, 48 );
398
md5_update( &md5, pad_1, 48 );
399
md5_finish( &md5, hash );
402
md5_update( &md5, ssl->session->master, 48 );
403
md5_update( &md5, pad_2, 48 );
404
md5_update( &md5, hash, 16 );
405
md5_finish( &md5, hash );
407
sha1_update( &sha1, ssl->session->master, 48 );
408
sha1_update( &sha1, pad_1, 40 );
409
sha1_finish( &sha1, hash + 16 );
411
sha1_starts( &sha1 );
412
sha1_update( &sha1, ssl->session->master, 48 );
413
sha1_update( &sha1, pad_2, 40 );
414
sha1_update( &sha1, hash + 16, 20 );
415
sha1_finish( &sha1, hash + 16 );
419
md5_finish( &md5, hash );
420
sha1_finish( &sha1, hash + 16 );
423
SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
424
SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
430
* SSLv3.0 MAC functions
432
static void ssl_mac_md5( unsigned char *secret,
433
unsigned char *buf, size_t len,
434
unsigned char *ctr, int type )
436
unsigned char header[11];
437
unsigned char padding[48];
440
memcpy( header, ctr, 8 );
441
header[ 8] = (unsigned char) type;
442
header[ 9] = (unsigned char)( len >> 8 );
443
header[10] = (unsigned char)( len );
445
memset( padding, 0x36, 48 );
447
md5_update( &md5, secret, 16 );
448
md5_update( &md5, padding, 48 );
449
md5_update( &md5, header, 11 );
450
md5_update( &md5, buf, len );
451
md5_finish( &md5, buf + len );
453
memset( padding, 0x5C, 48 );
455
md5_update( &md5, secret, 16 );
456
md5_update( &md5, padding, 48 );
457
md5_update( &md5, buf + len, 16 );
458
md5_finish( &md5, buf + len );
461
static void ssl_mac_sha1( unsigned char *secret,
462
unsigned char *buf, size_t len,
463
unsigned char *ctr, int type )
465
unsigned char header[11];
466
unsigned char padding[40];
469
memcpy( header, ctr, 8 );
470
header[ 8] = (unsigned char) type;
471
header[ 9] = (unsigned char)( len >> 8 );
472
header[10] = (unsigned char)( len );
474
memset( padding, 0x36, 40 );
475
sha1_starts( &sha1 );
476
sha1_update( &sha1, secret, 20 );
477
sha1_update( &sha1, padding, 40 );
478
sha1_update( &sha1, header, 11 );
479
sha1_update( &sha1, buf, len );
480
sha1_finish( &sha1, buf + len );
482
memset( padding, 0x5C, 40 );
483
sha1_starts( &sha1 );
484
sha1_update( &sha1, secret, 20 );
485
sha1_update( &sha1, padding, 40 );
486
sha1_update( &sha1, buf + len, 20 );
487
sha1_finish( &sha1, buf + len );
491
* Encryption/decryption functions
493
static int ssl_encrypt_buf( ssl_context *ssl )
497
SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
500
* Add MAC then encrypt
502
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
504
if( ssl->maclen == 16 )
505
ssl_mac_md5( ssl->mac_enc,
506
ssl->out_msg, ssl->out_msglen,
507
ssl->out_ctr, ssl->out_msgtype );
509
if( ssl->maclen == 20 )
510
ssl_mac_sha1( ssl->mac_enc,
511
ssl->out_msg, ssl->out_msglen,
512
ssl->out_ctr, ssl->out_msgtype );
516
if( ssl->maclen == 16 )
517
md5_hmac( ssl->mac_enc, 16,
518
ssl->out_ctr, ssl->out_msglen + 13,
519
ssl->out_msg + ssl->out_msglen );
521
if( ssl->maclen == 20 )
522
sha1_hmac( ssl->mac_enc, 20,
523
ssl->out_ctr, ssl->out_msglen + 13,
524
ssl->out_msg + ssl->out_msglen );
527
SSL_DEBUG_BUF( 4, "computed mac",
528
ssl->out_msg + ssl->out_msglen, ssl->maclen );
530
ssl->out_msglen += ssl->maclen;
532
for( i = 8; i > 0; i-- )
533
if( ++ssl->out_ctr[i - 1] != 0 )
536
if( ssl->ivlen == 0 )
538
#if defined(POLARSSL_ARC4_C)
541
SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
542
"including %d bytes of padding",
543
ssl->out_msglen, 0 ) );
545
SSL_DEBUG_BUF( 4, "before encrypt: output payload",
546
ssl->out_msg, ssl->out_msglen );
548
arc4_crypt( (arc4_context *) ssl->ctx_enc,
549
ssl->out_msglen, ssl->out_msg,
552
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
557
unsigned char *enc_msg;
560
padlen = ssl->ivlen - ( ssl->out_msglen + 1 ) % ssl->ivlen;
561
if( padlen == ssl->ivlen )
564
for( i = 0; i <= padlen; i++ )
565
ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
567
ssl->out_msglen += padlen + 1;
569
enc_msglen = ssl->out_msglen;
570
enc_msg = ssl->out_msg;
573
* Prepend per-record IV for block cipher in TLS v1.1 as per
574
* Method 1 (6.2.3.2. in RFC4346)
576
if( ssl->minor_ver == SSL_MINOR_VERSION_2 )
581
int ret = ssl->f_rng( ssl->p_rng, ssl->iv_enc, ssl->ivlen );
586
* Shift message for ivlen bytes and prepend IV
588
memmove( ssl->out_msg + ssl->ivlen, ssl->out_msg, ssl->out_msglen );
589
memcpy( ssl->out_msg, ssl->iv_enc, ssl->ivlen );
592
* Fix pointer positions and message length with added IV
594
enc_msg = ssl->out_msg + ssl->ivlen;
595
enc_msglen = ssl->out_msglen;
596
ssl->out_msglen += ssl->ivlen;
599
SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
600
"including %d bytes of IV and %d bytes of padding",
601
ssl->out_msglen, ssl->ivlen, padlen + 1 ) );
603
SSL_DEBUG_BUF( 4, "before encrypt: output payload",
604
ssl->out_msg, ssl->out_msglen );
609
#if defined(POLARSSL_DES_C)
610
des3_crypt_cbc( (des3_context *) ssl->ctx_enc,
611
DES_ENCRYPT, enc_msglen,
612
ssl->iv_enc, enc_msg, enc_msg );
617
#if defined(POLARSSL_AES_C)
618
if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA ||
619
ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
620
ssl->session->ciphersuite == SSL_RSA_AES_256_SHA ||
621
ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA)
623
aes_crypt_cbc( (aes_context *) ssl->ctx_enc,
624
AES_ENCRYPT, enc_msglen,
625
ssl->iv_enc, enc_msg, enc_msg);
630
#if defined(POLARSSL_CAMELLIA_C)
631
if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA ||
632
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
633
ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA ||
634
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA)
636
camellia_crypt_cbc( (camellia_context *) ssl->ctx_enc,
637
CAMELLIA_ENCRYPT, enc_msglen,
638
ssl->iv_enc, enc_msg, enc_msg );
644
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
648
SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
653
static int ssl_decrypt_buf( ssl_context *ssl )
656
unsigned char tmp[20];
658
SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
660
if( ssl->in_msglen < ssl->minlen )
662
SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
663
ssl->in_msglen, ssl->minlen ) );
664
return( POLARSSL_ERR_SSL_INVALID_MAC );
667
if( ssl->ivlen == 0 )
669
#if defined(POLARSSL_ARC4_C)
671
arc4_crypt( (arc4_context *) ssl->ctx_dec,
672
ssl->in_msglen, ssl->in_msg,
675
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
680
unsigned char *dec_msg;
681
unsigned char *dec_msg_result;
685
* Decrypt and check the padding
687
if( ssl->in_msglen % ssl->ivlen != 0 )
689
SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
690
ssl->in_msglen, ssl->ivlen ) );
691
return( POLARSSL_ERR_SSL_INVALID_MAC );
694
dec_msglen = ssl->in_msglen;
695
dec_msg = ssl->in_msg;
696
dec_msg_result = ssl->in_msg;
699
* Initialize for prepended IV for block cipher in TLS v1.1
701
if( ssl->minor_ver == SSL_MINOR_VERSION_2 )
703
dec_msg += ssl->ivlen;
704
dec_msglen -= ssl->ivlen;
705
ssl->in_msglen -= ssl->ivlen;
707
for( i = 0; i < ssl->ivlen; i++ )
708
ssl->iv_dec[i] = ssl->in_msg[i];
713
#if defined(POLARSSL_DES_C)
715
des3_crypt_cbc( (des3_context *) ssl->ctx_dec,
716
DES_DECRYPT, dec_msglen,
717
ssl->iv_dec, dec_msg, dec_msg_result );
722
#if defined(POLARSSL_AES_C)
723
if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA ||
724
ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
725
ssl->session->ciphersuite == SSL_RSA_AES_256_SHA ||
726
ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA)
728
aes_crypt_cbc( (aes_context *) ssl->ctx_dec,
729
AES_DECRYPT, dec_msglen,
730
ssl->iv_dec, dec_msg, dec_msg_result );
735
#if defined(POLARSSL_CAMELLIA_C)
736
if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA ||
737
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
738
ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA ||
739
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA)
741
camellia_crypt_cbc( (camellia_context *) ssl->ctx_dec,
742
CAMELLIA_DECRYPT, dec_msglen,
743
ssl->iv_dec, dec_msg, dec_msg_result );
749
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
752
padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
754
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
756
if( padlen > ssl->ivlen )
758
SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
759
"should be no more than %d",
760
padlen, ssl->ivlen ) );
767
* TLSv1: always check the padding
769
for( i = 1; i <= padlen; i++ )
771
if( ssl->in_msg[ssl->in_msglen - i] != padlen - 1 )
773
SSL_DEBUG_MSG( 1, ( "bad padding byte: should be "
774
"%02x, but is %02x", padlen - 1,
775
ssl->in_msg[ssl->in_msglen - i] ) );
782
SSL_DEBUG_BUF( 4, "raw buffer after decryption",
783
ssl->in_msg, ssl->in_msglen );
786
* Always compute the MAC (RFC4346, CBCTIME).
788
if( ssl->in_msglen <= ssl->maclen + padlen )
790
SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
791
ssl->in_msglen, ssl->maclen, padlen ) );
792
return( POLARSSL_ERR_SSL_INVALID_MAC );
795
ssl->in_msglen -= ( ssl->maclen + padlen );
797
ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 );
798
ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen );
800
memcpy( tmp, ssl->in_msg + ssl->in_msglen, 20 );
802
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
804
if( ssl->maclen == 16 )
805
ssl_mac_md5( ssl->mac_dec,
806
ssl->in_msg, ssl->in_msglen,
807
ssl->in_ctr, ssl->in_msgtype );
809
ssl_mac_sha1( ssl->mac_dec,
810
ssl->in_msg, ssl->in_msglen,
811
ssl->in_ctr, ssl->in_msgtype );
815
if( ssl->maclen == 16 )
816
md5_hmac( ssl->mac_dec, 16,
817
ssl->in_ctr, ssl->in_msglen + 13,
818
ssl->in_msg + ssl->in_msglen );
820
sha1_hmac( ssl->mac_dec, 20,
821
ssl->in_ctr, ssl->in_msglen + 13,
822
ssl->in_msg + ssl->in_msglen );
825
SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->maclen );
826
SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen,
829
if( memcmp( tmp, ssl->in_msg + ssl->in_msglen,
832
SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
833
return( POLARSSL_ERR_SSL_INVALID_MAC );
837
* Finally check the padding length; bad padding
838
* will produce the same error as an invalid MAC.
840
if( ssl->ivlen != 0 && padlen == 0 )
841
return( POLARSSL_ERR_SSL_INVALID_MAC );
843
if( ssl->in_msglen == 0 )
848
* Three or more empty messages may be a DoS attack
849
* (excessive CPU consumption).
851
if( ssl->nb_zero > 3 )
853
SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
854
"messages, possible DoS attack" ) );
855
return( POLARSSL_ERR_SSL_INVALID_MAC );
861
for( i = 8; i > 0; i-- )
862
if( ++ssl->in_ctr[i - 1] != 0 )
865
SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
871
* Fill the input message buffer
873
int ssl_fetch_input( ssl_context *ssl, size_t nb_want )
878
SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
880
while( ssl->in_left < nb_want )
882
len = nb_want - ssl->in_left;
883
ret = ssl->f_recv( ssl->p_recv, ssl->in_hdr + ssl->in_left, len );
885
SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
886
ssl->in_left, nb_want ) );
887
SSL_DEBUG_RET( 2, "ssl->f_recv", ret );
890
return( POLARSSL_ERR_SSL_CONN_EOF );
898
SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
904
* Flush any data not yet written
906
int ssl_flush_output( ssl_context *ssl )
911
SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
913
while( ssl->out_left > 0 )
915
SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
916
5 + ssl->out_msglen, ssl->out_left ) );
918
buf = ssl->out_hdr + 5 + ssl->out_msglen - ssl->out_left;
919
ret = ssl->f_send( ssl->p_send, buf, ssl->out_left );
920
SSL_DEBUG_RET( 2, "ssl->f_send", ret );
925
ssl->out_left -= ret;
928
SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
934
* Record layer functions
936
int ssl_write_record( ssl_context *ssl )
939
size_t len = ssl->out_msglen;
941
SSL_DEBUG_MSG( 2, ( "=> write record" ) );
943
ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
944
ssl->out_hdr[1] = (unsigned char) ssl->major_ver;
945
ssl->out_hdr[2] = (unsigned char) ssl->minor_ver;
946
ssl->out_hdr[3] = (unsigned char)( len >> 8 );
947
ssl->out_hdr[4] = (unsigned char)( len );
949
if( ssl->out_msgtype == SSL_MSG_HANDSHAKE )
951
ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
952
ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
953
ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
955
md5_update( &ssl->fin_md5 , ssl->out_msg, len );
956
sha1_update( &ssl->fin_sha1, ssl->out_msg, len );
959
if( ssl->do_crypt != 0 )
961
if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
963
SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
967
len = ssl->out_msglen;
968
ssl->out_hdr[3] = (unsigned char)( len >> 8 );
969
ssl->out_hdr[4] = (unsigned char)( len );
972
ssl->out_left = 5 + ssl->out_msglen;
974
SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
975
"version = [%d:%d], msglen = %d",
976
ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
977
( ssl->out_hdr[3] << 8 ) | ssl->out_hdr[4] ) );
979
SSL_DEBUG_BUF( 4, "output record sent to network",
980
ssl->out_hdr, 5 + ssl->out_msglen );
982
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
984
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
988
SSL_DEBUG_MSG( 2, ( "<= write record" ) );
993
int ssl_read_record( ssl_context *ssl )
997
SSL_DEBUG_MSG( 2, ( "=> read record" ) );
999
if( ssl->in_hslen != 0 &&
1000
ssl->in_hslen < ssl->in_msglen )
1003
* Get next Handshake message in the current record
1005
ssl->in_msglen -= ssl->in_hslen;
1007
memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
1011
ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3];
1013
SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
1014
" %d, type = %d, hslen = %d",
1015
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
1017
if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 )
1019
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
1020
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1023
if( ssl->in_msglen < ssl->in_hslen )
1025
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
1026
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1029
md5_update( &ssl->fin_md5 , ssl->in_msg, ssl->in_hslen );
1030
sha1_update( &ssl->fin_sha1, ssl->in_msg, ssl->in_hslen );
1038
* Read the record header and validate it
1040
if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 )
1042
SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
1046
ssl->in_msgtype = ssl->in_hdr[0];
1047
ssl->in_msglen = ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4];
1049
SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
1050
"version = [%d:%d], msglen = %d",
1051
ssl->in_hdr[0], ssl->in_hdr[1], ssl->in_hdr[2],
1052
( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4] ) );
1054
if( ssl->in_hdr[1] != ssl->major_ver )
1056
SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
1057
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1060
if( ssl->in_hdr[2] > ssl->max_minor_ver )
1062
SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
1063
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1067
* Make sure the message length is acceptable
1069
if( ssl->do_crypt == 0 )
1071
if( ssl->in_msglen < 1 ||
1072
ssl->in_msglen > SSL_MAX_CONTENT_LEN )
1074
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
1075
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1080
if( ssl->in_msglen < ssl->minlen )
1082
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
1083
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1086
if( ssl->minor_ver == SSL_MINOR_VERSION_0 &&
1087
ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN )
1089
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
1090
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1094
* TLS encrypted messages can have up to 256 bytes of padding
1096
if( ssl->minor_ver == SSL_MINOR_VERSION_1 &&
1097
ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN + 256 )
1099
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
1100
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1105
* Read and optionally decrypt the message contents
1107
if( ( ret = ssl_fetch_input( ssl, 5 + ssl->in_msglen ) ) != 0 )
1109
SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
1113
SSL_DEBUG_BUF( 4, "input record from network",
1114
ssl->in_hdr, 5 + ssl->in_msglen );
1116
if( ssl->do_crypt != 0 )
1118
if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
1120
SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
1124
SSL_DEBUG_BUF( 4, "input payload after decrypt",
1125
ssl->in_msg, ssl->in_msglen );
1127
if( ssl->in_msglen > SSL_MAX_CONTENT_LEN )
1129
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
1130
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1134
if( ssl->in_msgtype == SSL_MSG_HANDSHAKE )
1137
ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3];
1139
SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
1140
" %d, type = %d, hslen = %d",
1141
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
1144
* Additional checks to validate the handshake header
1146
if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 )
1148
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
1149
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1152
if( ssl->in_msglen < ssl->in_hslen )
1154
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
1155
return( POLARSSL_ERR_SSL_INVALID_RECORD );
1158
md5_update( &ssl->fin_md5 , ssl->in_msg, ssl->in_hslen );
1159
sha1_update( &ssl->fin_sha1, ssl->in_msg, ssl->in_hslen );
1162
if( ssl->in_msgtype == SSL_MSG_ALERT )
1164
SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
1165
ssl->in_msg[0], ssl->in_msg[1] ) );
1168
* Ignore non-fatal alerts, except close_notify
1170
if( ssl->in_msg[0] == SSL_ALERT_LEVEL_FATAL )
1172
SSL_DEBUG_MSG( 1, ( "is a fatal alert message" ) );
1174
* Subtract from error code as ssl->in_msg[1] is 7-bit positive
1177
return( POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE - ssl->in_msg[1] );
1180
if( ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING &&
1181
ssl->in_msg[1] == SSL_ALERT_MSG_CLOSE_NOTIFY )
1183
SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
1184
return( POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY );
1190
SSL_DEBUG_MSG( 2, ( "<= read record" ) );
1196
* Handshake functions
1198
int ssl_write_certificate( ssl_context *ssl )
1202
const x509_cert *crt;
1204
SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
1206
if( ssl->endpoint == SSL_IS_CLIENT )
1208
if( ssl->client_auth == 0 )
1210
SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
1216
* If using SSLv3 and got no cert, send an Alert message
1217
* (otherwise an empty Certificate message will be sent).
1219
if( ssl->own_cert == NULL &&
1220
ssl->minor_ver == SSL_MINOR_VERSION_0 )
1222
ssl->out_msglen = 2;
1223
ssl->out_msgtype = SSL_MSG_ALERT;
1224
ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING;
1225
ssl->out_msg[1] = SSL_ALERT_MSG_NO_CERT;
1227
SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
1231
else /* SSL_IS_SERVER */
1233
if( ssl->own_cert == NULL )
1235
SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
1236
return( POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED );
1240
SSL_DEBUG_CRT( 3, "own certificate", ssl->own_cert );
1243
* 0 . 0 handshake type
1244
* 1 . 3 handshake length
1245
* 4 . 6 length of all certs
1246
* 7 . 9 length of cert. 1
1247
* 10 . n-1 peer certificate
1248
* n . n+2 length of cert. 2
1249
* n+3 . ... upper level cert, etc.
1252
crt = ssl->own_cert;
1254
while( crt != NULL )
1257
if( i + 3 + n > SSL_MAX_CONTENT_LEN )
1259
SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
1260
i + 3 + n, SSL_MAX_CONTENT_LEN ) );
1261
return( POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE );
1264
ssl->out_msg[i ] = (unsigned char)( n >> 16 );
1265
ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
1266
ssl->out_msg[i + 2] = (unsigned char)( n );
1268
i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
1269
i += n; crt = crt->next;
1272
ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
1273
ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
1274
ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
1276
ssl->out_msglen = i;
1277
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
1278
ssl->out_msg[0] = SSL_HS_CERTIFICATE;
1284
if( ( ret = ssl_write_record( ssl ) ) != 0 )
1286
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
1290
SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
1295
int ssl_parse_certificate( ssl_context *ssl )
1300
SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
1302
if( ssl->endpoint == SSL_IS_SERVER &&
1303
ssl->authmode == SSL_VERIFY_NONE )
1305
ssl->verify_result = BADCERT_SKIP_VERIFY;
1306
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
1311
if( ( ret = ssl_read_record( ssl ) ) != 0 )
1313
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
1320
* Check if the client sent an empty certificate
1322
if( ssl->endpoint == SSL_IS_SERVER &&
1323
ssl->minor_ver == SSL_MINOR_VERSION_0 )
1325
if( ssl->in_msglen == 2 &&
1326
ssl->in_msgtype == SSL_MSG_ALERT &&
1327
ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING &&
1328
ssl->in_msg[1] == SSL_ALERT_MSG_NO_CERT )
1330
SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
1332
ssl->verify_result = BADCERT_MISSING;
1333
if( ssl->authmode == SSL_VERIFY_OPTIONAL )
1336
return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
1340
if( ssl->endpoint == SSL_IS_SERVER &&
1341
ssl->minor_ver != SSL_MINOR_VERSION_0 )
1343
if( ssl->in_hslen == 7 &&
1344
ssl->in_msgtype == SSL_MSG_HANDSHAKE &&
1345
ssl->in_msg[0] == SSL_HS_CERTIFICATE &&
1346
memcmp( ssl->in_msg + 4, "\0\0\0", 3 ) == 0 )
1348
SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
1350
ssl->verify_result = BADCERT_MISSING;
1351
if( ssl->authmode == SSL_VERIFY_REQUIRED )
1352
return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
1358
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
1360
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
1361
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
1364
if( ssl->in_msg[0] != SSL_HS_CERTIFICATE || ssl->in_hslen < 10 )
1366
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
1367
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
1371
* Same message structure as in ssl_write_certificate()
1373
n = ( ssl->in_msg[5] << 8 ) | ssl->in_msg[6];
1375
if( ssl->in_msg[4] != 0 || ssl->in_hslen != 7 + n )
1377
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
1378
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
1381
if( ( ssl->peer_cert = (x509_cert *) malloc(
1382
sizeof( x509_cert ) ) ) == NULL )
1384
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed",
1385
sizeof( x509_cert ) ) );
1386
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
1389
memset( ssl->peer_cert, 0, sizeof( x509_cert ) );
1393
while( i < ssl->in_hslen )
1395
if( ssl->in_msg[i] != 0 )
1397
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
1398
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
1401
n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
1402
| (unsigned int) ssl->in_msg[i + 2];
1405
if( n < 128 || i + n > ssl->in_hslen )
1407
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
1408
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
1411
ret = x509parse_crt( ssl->peer_cert, ssl->in_msg + i, n );
1414
SSL_DEBUG_RET( 1, " x509parse_crt", ret );
1421
SSL_DEBUG_CRT( 3, "peer certificate", ssl->peer_cert );
1423
if( ssl->authmode != SSL_VERIFY_NONE )
1425
if( ssl->ca_chain == NULL )
1427
SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
1428
return( POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED );
1431
ret = x509parse_verify( ssl->peer_cert, ssl->ca_chain, ssl->ca_crl,
1432
ssl->peer_cn, &ssl->verify_result,
1433
ssl->f_vrfy, ssl->p_vrfy );
1436
SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
1438
if( ssl->authmode != SSL_VERIFY_REQUIRED )
1442
SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
1447
int ssl_write_change_cipher_spec( ssl_context *ssl )
1451
SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
1453
ssl->out_msgtype = SSL_MSG_CHANGE_CIPHER_SPEC;
1454
ssl->out_msglen = 1;
1455
ssl->out_msg[0] = 1;
1460
if( ( ret = ssl_write_record( ssl ) ) != 0 )
1462
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
1466
SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
1471
int ssl_parse_change_cipher_spec( ssl_context *ssl )
1475
SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
1479
if( ( ret = ssl_read_record( ssl ) ) != 0 )
1481
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
1485
if( ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC )
1487
SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
1488
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
1491
if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
1493
SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
1494
return( POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
1499
SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
1504
static void ssl_calc_finished(
1505
ssl_context *ssl, unsigned char *buf, int from,
1506
md5_context *md5, sha1_context *sha1 )
1510
unsigned char padbuf[48];
1511
unsigned char md5sum[16];
1512
unsigned char sha1sum[20];
1514
SSL_DEBUG_MSG( 2, ( "=> calc finished" ) );
1519
* MD5( master + pad2 +
1520
* MD5( handshake + sender + master + pad1 ) )
1521
* + SHA1( master + pad2 +
1522
* SHA1( handshake + sender + master + pad1 ) )
1525
* hash = PRF( master, finished_label,
1526
* MD5( handshake ) + SHA1( handshake ) )[0..11]
1529
SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
1530
md5->state, sizeof( md5->state ) );
1532
SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
1533
sha1->state, sizeof( sha1->state ) );
1535
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
1537
sender = ( from == SSL_IS_CLIENT ) ? (char *) "CLNT"
1540
memset( padbuf, 0x36, 48 );
1542
md5_update( md5, (unsigned char *) sender, 4 );
1543
md5_update( md5, ssl->session->master, 48 );
1544
md5_update( md5, padbuf, 48 );
1545
md5_finish( md5, md5sum );
1547
sha1_update( sha1, (unsigned char *) sender, 4 );
1548
sha1_update( sha1, ssl->session->master, 48 );
1549
sha1_update( sha1, padbuf, 40 );
1550
sha1_finish( sha1, sha1sum );
1552
memset( padbuf, 0x5C, 48 );
1555
md5_update( md5, ssl->session->master, 48 );
1556
md5_update( md5, padbuf, 48 );
1557
md5_update( md5, md5sum, 16 );
1558
md5_finish( md5, buf );
1560
sha1_starts( sha1 );
1561
sha1_update( sha1, ssl->session->master, 48 );
1562
sha1_update( sha1, padbuf , 40 );
1563
sha1_update( sha1, sha1sum, 20 );
1564
sha1_finish( sha1, buf + 16 );
1570
sender = ( from == SSL_IS_CLIENT )
1571
? (char *) "client finished"
1572
: (char *) "server finished";
1574
md5_finish( md5, padbuf );
1575
sha1_finish( sha1, padbuf + 16 );
1577
tls1_prf( ssl->session->master, 48, sender,
1578
padbuf, 36, buf, len );
1581
SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
1583
memset( md5, 0, sizeof( md5_context ) );
1584
memset( sha1, 0, sizeof( sha1_context ) );
1586
memset( padbuf, 0, sizeof( padbuf ) );
1587
memset( md5sum, 0, sizeof( md5sum ) );
1588
memset( sha1sum, 0, sizeof( sha1sum ) );
1590
SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
1593
int ssl_write_finished( ssl_context *ssl )
1599
SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
1601
memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
1602
memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
1604
ssl_calc_finished( ssl, ssl->out_msg + 4,
1605
ssl->endpoint, &md5, &sha1 );
1607
hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12;
1609
ssl->out_msglen = 4 + hash_len;
1610
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
1611
ssl->out_msg[0] = SSL_HS_FINISHED;
1614
* In case of session resuming, invert the client and server
1615
* ChangeCipherSpec messages order.
1617
if( ssl->resume != 0 )
1619
if( ssl->endpoint == SSL_IS_CLIENT )
1620
ssl->state = SSL_HANDSHAKE_OVER;
1622
ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
1629
if( ( ret = ssl_write_record( ssl ) ) != 0 )
1631
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
1635
SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
1640
int ssl_parse_finished( ssl_context *ssl )
1643
unsigned int hash_len;
1644
unsigned char buf[36];
1648
SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
1650
memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
1651
memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
1655
if( ( ret = ssl_read_record( ssl ) ) != 0 )
1657
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
1661
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
1663
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
1664
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
1667
hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12;
1669
if( ssl->in_msg[0] != SSL_HS_FINISHED ||
1670
ssl->in_hslen != 4 + hash_len )
1672
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
1673
return( POLARSSL_ERR_SSL_BAD_HS_FINISHED );
1676
ssl_calc_finished( ssl, buf, ssl->endpoint ^ 1, &md5, &sha1 );
1678
if( memcmp( ssl->in_msg + 4, buf, hash_len ) != 0 )
1680
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
1681
return( POLARSSL_ERR_SSL_BAD_HS_FINISHED );
1684
if( ssl->resume != 0 )
1686
if( ssl->endpoint == SSL_IS_CLIENT )
1687
ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
1689
if( ssl->endpoint == SSL_IS_SERVER )
1690
ssl->state = SSL_HANDSHAKE_OVER;
1695
SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
1701
* Initialize an SSL context
1703
int ssl_init( ssl_context *ssl )
1705
int len = SSL_BUFFER_LEN;
1707
memset( ssl, 0, sizeof( ssl_context ) );
1709
ssl->in_ctr = (unsigned char *) malloc( len );
1710
ssl->in_hdr = ssl->in_ctr + 8;
1711
ssl->in_msg = ssl->in_ctr + 13;
1713
if( ssl->in_ctr == NULL )
1715
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) );
1716
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
1719
ssl->out_ctr = (unsigned char *) malloc( len );
1720
ssl->out_hdr = ssl->out_ctr + 8;
1721
ssl->out_msg = ssl->out_ctr + 13;
1723
if( ssl->out_ctr == NULL )
1725
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) );
1726
free( ssl-> in_ctr );
1727
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
1730
memset( ssl-> in_ctr, 0, SSL_BUFFER_LEN );
1731
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
1733
ssl->hostname = NULL;
1734
ssl->hostname_len = 0;
1736
md5_starts( &ssl->fin_md5 );
1737
sha1_starts( &ssl->fin_sha1 );
1743
* Reset an initialized and used SSL context for re-use while retaining
1744
* all application-set variables, function pointers and data.
1746
void ssl_session_reset( ssl_context *ssl )
1748
ssl->state = SSL_HELLO_REQUEST;
1750
ssl->in_offt = NULL;
1752
ssl->in_msgtype = 0;
1759
ssl->out_msgtype = 0;
1760
ssl->out_msglen = 0;
1770
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
1771
memset( ssl->in_ctr, 0, SSL_BUFFER_LEN );
1772
memset( ssl->randbytes, 0, 64 );
1773
memset( ssl->premaster, 0, 256 );
1774
memset( ssl->iv_enc, 0, 16 );
1775
memset( ssl->iv_dec, 0, 16 );
1776
memset( ssl->mac_enc, 0, 32 );
1777
memset( ssl->mac_dec, 0, 32 );
1778
memset( ssl->ctx_enc, 0, 128 );
1779
memset( ssl->ctx_dec, 0, 128 );
1781
md5_starts( &ssl->fin_md5 );
1782
sha1_starts( &ssl->fin_sha1 );
1788
void ssl_set_endpoint( ssl_context *ssl, int endpoint )
1790
ssl->endpoint = endpoint;
1793
void ssl_set_authmode( ssl_context *ssl, int authmode )
1795
ssl->authmode = authmode;
1798
void ssl_set_verify( ssl_context *ssl,
1799
int (*f_vrfy)(void *, x509_cert *, int, int),
1802
ssl->f_vrfy = f_vrfy;
1803
ssl->p_vrfy = p_vrfy;
1806
void ssl_set_rng( ssl_context *ssl,
1807
int (*f_rng)(void *, unsigned char *, size_t),
1814
void ssl_set_dbg( ssl_context *ssl,
1815
void (*f_dbg)(void *, int, const char *),
1822
void ssl_set_bio( ssl_context *ssl,
1823
int (*f_recv)(void *, unsigned char *, size_t), void *p_recv,
1824
int (*f_send)(void *, const unsigned char *, size_t), void *p_send )
1826
ssl->f_recv = f_recv;
1827
ssl->f_send = f_send;
1828
ssl->p_recv = p_recv;
1829
ssl->p_send = p_send;
1832
void ssl_set_scb( ssl_context *ssl,
1833
int (*s_get)(ssl_context *),
1834
int (*s_set)(ssl_context *) )
1840
void ssl_set_session( ssl_context *ssl, int resume, int timeout,
1841
ssl_session *session )
1843
ssl->resume = resume;
1844
ssl->timeout = timeout;
1845
ssl->session = session;
1848
void ssl_set_ciphersuites( ssl_context *ssl, int *ciphersuites )
1850
ssl->ciphersuites = ciphersuites;
1853
void ssl_set_ca_chain( ssl_context *ssl, x509_cert *ca_chain,
1854
x509_crl *ca_crl, const char *peer_cn )
1856
ssl->ca_chain = ca_chain;
1857
ssl->ca_crl = ca_crl;
1858
ssl->peer_cn = peer_cn;
1861
void ssl_set_own_cert( ssl_context *ssl, x509_cert *own_cert,
1862
rsa_context *rsa_key )
1864
ssl->own_cert = own_cert;
1865
ssl->rsa_key = rsa_key;
1868
#if defined(POLARSSL_PKCS11_C)
1869
void ssl_set_own_cert_pkcs11( ssl_context *ssl, x509_cert *own_cert,
1870
pkcs11_context *pkcs11_key )
1872
ssl->own_cert = own_cert;
1873
ssl->pkcs11_key = pkcs11_key;
1877
int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G )
1881
if( ( ret = mpi_read_string( &ssl->dhm_ctx.P, 16, dhm_P ) ) != 0 )
1883
SSL_DEBUG_RET( 1, "mpi_read_string", ret );
1887
if( ( ret = mpi_read_string( &ssl->dhm_ctx.G, 16, dhm_G ) ) != 0 )
1889
SSL_DEBUG_RET( 1, "mpi_read_string", ret );
1896
int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx )
1900
if( ( ret = mpi_copy(&ssl->dhm_ctx.P, &dhm_ctx->P) ) != 0 )
1902
SSL_DEBUG_RET( 1, "mpi_copy", ret );
1906
if( ( ret = mpi_copy(&ssl->dhm_ctx.G, &dhm_ctx->G) ) != 0 )
1908
SSL_DEBUG_RET( 1, "mpi_copy", ret );
1915
int ssl_set_hostname( ssl_context *ssl, const char *hostname )
1917
if( hostname == NULL )
1918
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
1920
ssl->hostname_len = strlen( hostname );
1921
ssl->hostname = (unsigned char *) malloc( ssl->hostname_len + 1 );
1923
if( ssl->hostname == NULL )
1924
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
1926
memcpy( ssl->hostname, (unsigned char *) hostname,
1927
ssl->hostname_len );
1929
ssl->hostname[ssl->hostname_len] = '\0';
1934
void ssl_set_max_version( ssl_context *ssl, int major, int minor )
1936
ssl->max_major_ver = major;
1937
ssl->max_minor_ver = minor;
1943
size_t ssl_get_bytes_avail( const ssl_context *ssl )
1945
return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
1948
int ssl_get_verify_result( const ssl_context *ssl )
1950
return( ssl->verify_result );
1953
const char *ssl_get_ciphersuite_name( const int ciphersuite_id )
1955
switch( ciphersuite_id )
1957
#if defined(POLARSSL_ARC4_C)
1958
case SSL_RSA_RC4_128_MD5:
1959
return( "SSL-RSA-RC4-128-MD5" );
1961
case SSL_RSA_RC4_128_SHA:
1962
return( "SSL-RSA-RC4-128-SHA" );
1965
#if defined(POLARSSL_DES_C)
1966
case SSL_RSA_DES_168_SHA:
1967
return( "SSL-RSA-DES-168-SHA" );
1969
case SSL_EDH_RSA_DES_168_SHA:
1970
return( "SSL-EDH-RSA-DES-168-SHA" );
1973
#if defined(POLARSSL_AES_C)
1974
case SSL_RSA_AES_128_SHA:
1975
return( "SSL-RSA-AES-128-SHA" );
1977
case SSL_EDH_RSA_AES_128_SHA:
1978
return( "SSL-EDH-RSA-AES-128-SHA" );
1980
case SSL_RSA_AES_256_SHA:
1981
return( "SSL-RSA-AES-256-SHA" );
1983
case SSL_EDH_RSA_AES_256_SHA:
1984
return( "SSL-EDH-RSA-AES-256-SHA" );
1987
#if defined(POLARSSL_CAMELLIA_C)
1988
case SSL_RSA_CAMELLIA_128_SHA:
1989
return( "SSL-RSA-CAMELLIA-128-SHA" );
1991
case SSL_EDH_RSA_CAMELLIA_128_SHA:
1992
return( "SSL-EDH-RSA-CAMELLIA-128-SHA" );
1994
case SSL_RSA_CAMELLIA_256_SHA:
1995
return( "SSL-RSA-CAMELLIA-256-SHA" );
1997
case SSL_EDH_RSA_CAMELLIA_256_SHA:
1998
return( "SSL-EDH-RSA-CAMELLIA-256-SHA" );
2005
return( "unknown" );
2008
int ssl_get_ciphersuite_id( const char *ciphersuite_name )
2010
#if defined(POLARSSL_ARC4_C)
2011
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-MD5"))
2012
return( SSL_RSA_RC4_128_MD5 );
2013
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-SHA"))
2014
return( SSL_RSA_RC4_128_SHA );
2017
#if defined(POLARSSL_DES_C)
2018
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-DES-168-SHA"))
2019
return( SSL_RSA_DES_168_SHA );
2020
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-DES-168-SHA"))
2021
return( SSL_EDH_RSA_DES_168_SHA );
2024
#if defined(POLARSSL_AES_C)
2025
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-128-SHA"))
2026
return( SSL_RSA_AES_128_SHA );
2027
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-128-SHA"))
2028
return( SSL_EDH_RSA_AES_128_SHA );
2029
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-256-SHA"))
2030
return( SSL_RSA_AES_256_SHA );
2031
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-256-SHA"))
2032
return( SSL_EDH_RSA_AES_256_SHA );
2035
#if defined(POLARSSL_CAMELLIA_C)
2036
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-128-SHA"))
2037
return( SSL_RSA_CAMELLIA_128_SHA );
2038
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-128-SHA"))
2039
return( SSL_EDH_RSA_CAMELLIA_128_SHA );
2040
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-256-SHA"))
2041
return( SSL_RSA_CAMELLIA_256_SHA );
2042
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-256-SHA"))
2043
return( SSL_EDH_RSA_CAMELLIA_256_SHA );
2049
const char *ssl_get_ciphersuite( const ssl_context *ssl )
2051
return ssl_get_ciphersuite_name( ssl->session->ciphersuite );
2054
const char *ssl_get_version( const ssl_context *ssl )
2056
switch( ssl->minor_ver )
2058
case SSL_MINOR_VERSION_0:
2059
return( "SSLv3.0" );
2061
case SSL_MINOR_VERSION_1:
2062
return( "TLSv1.0" );
2064
case SSL_MINOR_VERSION_2:
2065
return( "TLSv1.1" );
2070
return( "unknown" );
2073
int ssl_default_ciphersuites[] =
2075
#if defined(POLARSSL_DHM_C)
2076
#if defined(POLARSSL_AES_C)
2077
SSL_EDH_RSA_AES_128_SHA,
2078
SSL_EDH_RSA_AES_256_SHA,
2080
#if defined(POLARSSL_CAMELLIA_C)
2081
SSL_EDH_RSA_CAMELLIA_128_SHA,
2082
SSL_EDH_RSA_CAMELLIA_256_SHA,
2084
#if defined(POLARSSL_DES_C)
2085
SSL_EDH_RSA_DES_168_SHA,
2089
#if defined(POLARSSL_AES_C)
2090
SSL_RSA_AES_256_SHA,
2092
#if defined(POLARSSL_CAMELLIA_C)
2093
SSL_RSA_CAMELLIA_256_SHA,
2095
#if defined(POLARSSL_AES_C)
2096
SSL_RSA_AES_128_SHA,
2098
#if defined(POLARSSL_CAMELLIA_C)
2099
SSL_RSA_CAMELLIA_128_SHA,
2101
#if defined(POLARSSL_DES_C)
2102
SSL_RSA_DES_168_SHA,
2104
#if defined(POLARSSL_ARC4_C)
2105
SSL_RSA_RC4_128_SHA,
2106
SSL_RSA_RC4_128_MD5,
2112
* Perform the SSL handshake
2114
int ssl_handshake( ssl_context *ssl )
2116
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
2118
SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
2120
#if defined(POLARSSL_SSL_CLI_C)
2121
if( ssl->endpoint == SSL_IS_CLIENT )
2122
ret = ssl_handshake_client( ssl );
2125
#if defined(POLARSSL_SSL_SRV_C)
2126
if( ssl->endpoint == SSL_IS_SERVER )
2127
ret = ssl_handshake_server( ssl );
2130
SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
2136
* Receive application data decrypted from the SSL layer
2138
int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len )
2143
SSL_DEBUG_MSG( 2, ( "=> read" ) );
2145
if( ssl->state != SSL_HANDSHAKE_OVER )
2147
if( ( ret = ssl_handshake( ssl ) ) != 0 )
2149
SSL_DEBUG_RET( 1, "ssl_handshake", ret );
2154
if( ssl->in_offt == NULL )
2156
if( ( ret = ssl_read_record( ssl ) ) != 0 )
2158
if( ret == POLARSSL_ERR_SSL_CONN_EOF )
2161
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
2165
if( ssl->in_msglen == 0 &&
2166
ssl->in_msgtype == SSL_MSG_APPLICATION_DATA )
2169
* OpenSSL sends empty messages to randomize the IV
2171
if( ( ret = ssl_read_record( ssl ) ) != 0 )
2173
if( ret == POLARSSL_ERR_SSL_CONN_EOF )
2176
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
2181
if( ssl->in_msgtype != SSL_MSG_APPLICATION_DATA )
2183
SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
2184
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
2187
ssl->in_offt = ssl->in_msg;
2190
n = ( len < ssl->in_msglen )
2191
? len : ssl->in_msglen;
2193
memcpy( buf, ssl->in_offt, n );
2194
ssl->in_msglen -= n;
2196
if( ssl->in_msglen == 0 )
2197
/* all bytes consumed */
2198
ssl->in_offt = NULL;
2200
/* more data available */
2203
SSL_DEBUG_MSG( 2, ( "<= read" ) );
2209
* Send application data to be encrypted by the SSL layer
2211
int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
2216
SSL_DEBUG_MSG( 2, ( "=> write" ) );
2218
if( ssl->state != SSL_HANDSHAKE_OVER )
2220
if( ( ret = ssl_handshake( ssl ) ) != 0 )
2222
SSL_DEBUG_RET( 1, "ssl_handshake", ret );
2227
n = ( len < SSL_MAX_CONTENT_LEN )
2228
? len : SSL_MAX_CONTENT_LEN;
2230
if( ssl->out_left != 0 )
2232
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
2234
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
2240
ssl->out_msglen = n;
2241
ssl->out_msgtype = SSL_MSG_APPLICATION_DATA;
2242
memcpy( ssl->out_msg, buf, n );
2244
if( ( ret = ssl_write_record( ssl ) ) != 0 )
2246
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
2251
SSL_DEBUG_MSG( 2, ( "<= write" ) );
2257
* Notify the peer that the connection is being closed
2259
int ssl_close_notify( ssl_context *ssl )
2263
SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
2265
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
2267
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
2271
if( ssl->state == SSL_HANDSHAKE_OVER )
2273
ssl->out_msgtype = SSL_MSG_ALERT;
2274
ssl->out_msglen = 2;
2275
ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING;
2276
ssl->out_msg[1] = SSL_ALERT_MSG_CLOSE_NOTIFY;
2278
if( ( ret = ssl_write_record( ssl ) ) != 0 )
2280
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
2285
SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
2291
* Free an SSL context
2293
void ssl_free( ssl_context *ssl )
2295
SSL_DEBUG_MSG( 2, ( "=> free" ) );
2297
if( ssl->peer_cert != NULL )
2299
x509_free( ssl->peer_cert );
2300
memset( ssl->peer_cert, 0, sizeof( x509_cert ) );
2301
free( ssl->peer_cert );
2304
if( ssl->out_ctr != NULL )
2306
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
2307
free( ssl->out_ctr );
2310
if( ssl->in_ctr != NULL )
2312
memset( ssl->in_ctr, 0, SSL_BUFFER_LEN );
2313
free( ssl->in_ctr );
2316
#if defined(POLARSSL_DHM_C)
2317
dhm_free( &ssl->dhm_ctx );
2320
if ( ssl->hostname != NULL)
2322
memset( ssl->hostname, 0, ssl->hostname_len );
2323
free( ssl->hostname );
2324
ssl->hostname_len = 0;
2327
SSL_DEBUG_MSG( 2, ( "<= free" ) );
2329
/* Actually free after last debug message */
2330
memset( ssl, 0, sizeof( ssl_context ) );