2322 lines
62 KiB
C
2322 lines
62 KiB
C
/*
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* SSLv3/TLSv1 shared functions
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*
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* Copyright (C) 2006-2010, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* The SSL 3.0 specification was drafted by Netscape in 1996,
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* and became an IETF standard in 1999.
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*
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* http://wp.netscape.com/eng/ssl3/
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* http://www.ietf.org/rfc/rfc2246.txt
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* http://www.ietf.org/rfc/rfc4346.txt
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_SSL_TLS_C)
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#include "polarssl/aes.h"
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#include "polarssl/arc4.h"
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#include "polarssl/camellia.h"
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#include "polarssl/des.h"
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#include "polarssl/debug.h"
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#include "polarssl/ssl.h"
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#include <stdlib.h>
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#include <time.h>
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#if defined _MSC_VER && !defined strcasecmp
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#define strcasecmp _stricmp
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#endif
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/*
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* Key material generation
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*/
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static int tls1_prf( unsigned char *secret, size_t slen, char *label,
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unsigned char *random, size_t rlen,
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unsigned char *dstbuf, size_t dlen )
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{
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size_t nb, hs;
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size_t i, j, k;
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unsigned char *S1, *S2;
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unsigned char tmp[128];
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unsigned char h_i[20];
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if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
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return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
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hs = ( slen + 1 ) / 2;
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S1 = secret;
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S2 = secret + slen - hs;
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nb = strlen( label );
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memcpy( tmp + 20, label, nb );
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memcpy( tmp + 20 + nb, random, rlen );
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nb += rlen;
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/*
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* First compute P_md5(secret,label+random)[0..dlen]
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*/
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md5_hmac( S1, hs, tmp + 20, nb, 4 + tmp );
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for( i = 0; i < dlen; i += 16 )
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{
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md5_hmac( S1, hs, 4 + tmp, 16 + nb, h_i );
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md5_hmac( S1, hs, 4 + tmp, 16, 4 + tmp );
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k = ( i + 16 > dlen ) ? dlen % 16 : 16;
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for( j = 0; j < k; j++ )
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dstbuf[i + j] = h_i[j];
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}
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/*
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* XOR out with P_sha1(secret,label+random)[0..dlen]
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*/
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sha1_hmac( S2, hs, tmp + 20, nb, tmp );
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for( i = 0; i < dlen; i += 20 )
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{
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sha1_hmac( S2, hs, tmp, 20 + nb, h_i );
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sha1_hmac( S2, hs, tmp, 20, tmp );
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k = ( i + 20 > dlen ) ? dlen % 20 : 20;
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for( j = 0; j < k; j++ )
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dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
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}
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memset( tmp, 0, sizeof( tmp ) );
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memset( h_i, 0, sizeof( h_i ) );
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return( 0 );
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}
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int ssl_derive_keys( ssl_context *ssl )
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{
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int i;
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md5_context md5;
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sha1_context sha1;
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unsigned char tmp[64];
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unsigned char padding[16];
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unsigned char sha1sum[20];
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unsigned char keyblk[256];
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unsigned char *key1;
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unsigned char *key2;
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SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
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/*
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* SSLv3:
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* master =
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* MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
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* MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
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* MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
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*
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* TLSv1:
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* master = PRF( premaster, "master secret", randbytes )[0..47]
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*/
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if( ssl->resume == 0 )
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{
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size_t len = ssl->pmslen;
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SSL_DEBUG_BUF( 3, "premaster secret", ssl->premaster, len );
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if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
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{
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for( i = 0; i < 3; i++ )
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{
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memset( padding, 'A' + i, 1 + i );
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sha1_starts( &sha1 );
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sha1_update( &sha1, padding, 1 + i );
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sha1_update( &sha1, ssl->premaster, len );
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sha1_update( &sha1, ssl->randbytes, 64 );
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sha1_finish( &sha1, sha1sum );
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md5_starts( &md5 );
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md5_update( &md5, ssl->premaster, len );
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md5_update( &md5, sha1sum, 20 );
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md5_finish( &md5, ssl->session->master + i * 16 );
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}
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}
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else
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tls1_prf( ssl->premaster, len, "master secret",
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ssl->randbytes, 64, ssl->session->master, 48 );
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memset( ssl->premaster, 0, sizeof( ssl->premaster ) );
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}
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else
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SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
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/*
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* Swap the client and server random values.
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*/
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memcpy( tmp, ssl->randbytes, 64 );
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memcpy( ssl->randbytes, tmp + 32, 32 );
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memcpy( ssl->randbytes + 32, tmp, 32 );
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memset( tmp, 0, sizeof( tmp ) );
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/*
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* SSLv3:
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* key block =
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* MD5( master + SHA1( 'A' + master + randbytes ) ) +
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* MD5( master + SHA1( 'BB' + master + randbytes ) ) +
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* MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
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* MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
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* ...
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*
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* TLSv1:
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* key block = PRF( master, "key expansion", randbytes )
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*/
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if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
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{
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for( i = 0; i < 16; i++ )
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{
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memset( padding, 'A' + i, 1 + i );
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sha1_starts( &sha1 );
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sha1_update( &sha1, padding, 1 + i );
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sha1_update( &sha1, ssl->session->master, 48 );
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sha1_update( &sha1, ssl->randbytes, 64 );
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sha1_finish( &sha1, sha1sum );
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md5_starts( &md5 );
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md5_update( &md5, ssl->session->master, 48 );
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md5_update( &md5, sha1sum, 20 );
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md5_finish( &md5, keyblk + i * 16 );
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}
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memset( &md5, 0, sizeof( md5 ) );
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memset( &sha1, 0, sizeof( sha1 ) );
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memset( padding, 0, sizeof( padding ) );
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memset( sha1sum, 0, sizeof( sha1sum ) );
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}
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else
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tls1_prf( ssl->session->master, 48, "key expansion",
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ssl->randbytes, 64, keyblk, 256 );
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SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", ssl_get_ciphersuite( ssl ) ) );
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SSL_DEBUG_BUF( 3, "master secret", ssl->session->master, 48 );
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SSL_DEBUG_BUF( 4, "random bytes", ssl->randbytes, 64 );
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SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
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memset( ssl->randbytes, 0, sizeof( ssl->randbytes ) );
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/*
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* Determine the appropriate key, IV and MAC length.
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*/
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switch( ssl->session->ciphersuite )
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{
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#if defined(POLARSSL_ARC4_C)
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case SSL_RSA_RC4_128_MD5:
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ssl->keylen = 16; ssl->minlen = 16;
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ssl->ivlen = 0; ssl->maclen = 16;
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break;
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case SSL_RSA_RC4_128_SHA:
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ssl->keylen = 16; ssl->minlen = 20;
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ssl->ivlen = 0; ssl->maclen = 20;
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break;
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#endif
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#if defined(POLARSSL_DES_C)
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case SSL_RSA_DES_168_SHA:
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case SSL_EDH_RSA_DES_168_SHA:
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ssl->keylen = 24; ssl->minlen = 24;
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ssl->ivlen = 8; ssl->maclen = 20;
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break;
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#endif
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#if defined(POLARSSL_AES_C)
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case SSL_RSA_AES_128_SHA:
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case SSL_EDH_RSA_AES_128_SHA:
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ssl->keylen = 16; ssl->minlen = 32;
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ssl->ivlen = 16; ssl->maclen = 20;
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break;
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case SSL_RSA_AES_256_SHA:
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case SSL_EDH_RSA_AES_256_SHA:
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ssl->keylen = 32; ssl->minlen = 32;
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ssl->ivlen = 16; ssl->maclen = 20;
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break;
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#endif
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#if defined(POLARSSL_CAMELLIA_C)
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case SSL_RSA_CAMELLIA_128_SHA:
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case SSL_EDH_RSA_CAMELLIA_128_SHA:
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ssl->keylen = 16; ssl->minlen = 32;
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ssl->ivlen = 16; ssl->maclen = 20;
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break;
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case SSL_RSA_CAMELLIA_256_SHA:
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case SSL_EDH_RSA_CAMELLIA_256_SHA:
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ssl->keylen = 32; ssl->minlen = 32;
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ssl->ivlen = 16; ssl->maclen = 20;
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break;
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#endif
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default:
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SSL_DEBUG_MSG( 1, ( "ciphersuite %s is not available",
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ssl_get_ciphersuite( ssl ) ) );
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return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
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}
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SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
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ssl->keylen, ssl->minlen, ssl->ivlen, ssl->maclen ) );
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/*
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* Finally setup the cipher contexts, IVs and MAC secrets.
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*/
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if( ssl->endpoint == SSL_IS_CLIENT )
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{
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key1 = keyblk + ssl->maclen * 2;
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key2 = keyblk + ssl->maclen * 2 + ssl->keylen;
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memcpy( ssl->mac_enc, keyblk, ssl->maclen );
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memcpy( ssl->mac_dec, keyblk + ssl->maclen, ssl->maclen );
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/*
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* This is not used in TLS v1.1.
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*/
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memcpy( ssl->iv_enc, key2 + ssl->keylen, ssl->ivlen );
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memcpy( ssl->iv_dec, key2 + ssl->keylen + ssl->ivlen,
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ssl->ivlen );
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}
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else
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{
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key1 = keyblk + ssl->maclen * 2 + ssl->keylen;
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key2 = keyblk + ssl->maclen * 2;
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memcpy( ssl->mac_dec, keyblk, ssl->maclen );
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memcpy( ssl->mac_enc, keyblk + ssl->maclen, ssl->maclen );
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/*
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* This is not used in TLS v1.1.
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*/
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memcpy( ssl->iv_dec, key1 + ssl->keylen, ssl->ivlen );
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memcpy( ssl->iv_enc, key1 + ssl->keylen + ssl->ivlen,
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ssl->ivlen );
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}
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switch( ssl->session->ciphersuite )
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{
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#if defined(POLARSSL_ARC4_C)
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case SSL_RSA_RC4_128_MD5:
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case SSL_RSA_RC4_128_SHA:
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arc4_setup( (arc4_context *) ssl->ctx_enc, key1, ssl->keylen );
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arc4_setup( (arc4_context *) ssl->ctx_dec, key2, ssl->keylen );
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break;
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#endif
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#if defined(POLARSSL_DES_C)
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case SSL_RSA_DES_168_SHA:
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case SSL_EDH_RSA_DES_168_SHA:
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des3_set3key_enc( (des3_context *) ssl->ctx_enc, key1 );
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des3_set3key_dec( (des3_context *) ssl->ctx_dec, key2 );
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break;
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#endif
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#if defined(POLARSSL_AES_C)
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case SSL_RSA_AES_128_SHA:
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case SSL_EDH_RSA_AES_128_SHA:
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aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 128 );
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aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 128 );
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break;
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case SSL_RSA_AES_256_SHA:
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case SSL_EDH_RSA_AES_256_SHA:
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aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 256 );
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aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 256 );
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break;
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#endif
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#if defined(POLARSSL_CAMELLIA_C)
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case SSL_RSA_CAMELLIA_128_SHA:
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case SSL_EDH_RSA_CAMELLIA_128_SHA:
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camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 128 );
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camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 128 );
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break;
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case SSL_RSA_CAMELLIA_256_SHA:
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case SSL_EDH_RSA_CAMELLIA_256_SHA:
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camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 256 );
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camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 256 );
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break;
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#endif
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default:
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return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
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}
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memset( keyblk, 0, sizeof( keyblk ) );
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SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
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return( 0 );
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}
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void ssl_calc_verify( ssl_context *ssl, unsigned char hash[36] )
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{
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md5_context md5;
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sha1_context sha1;
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unsigned char pad_1[48];
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unsigned char pad_2[48];
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SSL_DEBUG_MSG( 2, ( "=> calc verify" ) );
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memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
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memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
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if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
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{
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memset( pad_1, 0x36, 48 );
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memset( pad_2, 0x5C, 48 );
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md5_update( &md5, ssl->session->master, 48 );
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md5_update( &md5, pad_1, 48 );
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md5_finish( &md5, hash );
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md5_starts( &md5 );
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md5_update( &md5, ssl->session->master, 48 );
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md5_update( &md5, pad_2, 48 );
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md5_update( &md5, hash, 16 );
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md5_finish( &md5, hash );
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sha1_update( &sha1, ssl->session->master, 48 );
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sha1_update( &sha1, pad_1, 40 );
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sha1_finish( &sha1, hash + 16 );
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sha1_starts( &sha1 );
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sha1_update( &sha1, ssl->session->master, 48 );
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sha1_update( &sha1, pad_2, 40 );
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sha1_update( &sha1, hash + 16, 20 );
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sha1_finish( &sha1, hash + 16 );
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}
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else /* TLSv1 */
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{
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md5_finish( &md5, hash );
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sha1_finish( &sha1, hash + 16 );
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}
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SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
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SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
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return;
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}
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|
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/*
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* SSLv3.0 MAC functions
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*/
|
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static void ssl_mac_md5( unsigned char *secret,
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unsigned char *buf, size_t len,
|
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unsigned char *ctr, int type )
|
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{
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unsigned char header[11];
|
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unsigned char padding[48];
|
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md5_context md5;
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memcpy( header, ctr, 8 );
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header[ 8] = (unsigned char) type;
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header[ 9] = (unsigned char)( len >> 8 );
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header[10] = (unsigned char)( len );
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memset( padding, 0x36, 48 );
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md5_starts( &md5 );
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md5_update( &md5, secret, 16 );
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md5_update( &md5, padding, 48 );
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md5_update( &md5, header, 11 );
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md5_update( &md5, buf, len );
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md5_finish( &md5, buf + len );
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memset( padding, 0x5C, 48 );
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md5_starts( &md5 );
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md5_update( &md5, secret, 16 );
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md5_update( &md5, padding, 48 );
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md5_update( &md5, buf + len, 16 );
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md5_finish( &md5, buf + len );
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}
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|
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static void ssl_mac_sha1( unsigned char *secret,
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unsigned char *buf, size_t len,
|
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unsigned char *ctr, int type )
|
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{
|
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unsigned char header[11];
|
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unsigned char padding[40];
|
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sha1_context sha1;
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|
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memcpy( header, ctr, 8 );
|
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header[ 8] = (unsigned char) type;
|
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header[ 9] = (unsigned char)( len >> 8 );
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header[10] = (unsigned char)( len );
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|
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memset( padding, 0x36, 40 );
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sha1_starts( &sha1 );
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sha1_update( &sha1, secret, 20 );
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sha1_update( &sha1, padding, 40 );
|
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sha1_update( &sha1, header, 11 );
|
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sha1_update( &sha1, buf, len );
|
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sha1_finish( &sha1, buf + len );
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|
|
|
memset( padding, 0x5C, 40 );
|
|
sha1_starts( &sha1 );
|
|
sha1_update( &sha1, secret, 20 );
|
|
sha1_update( &sha1, padding, 40 );
|
|
sha1_update( &sha1, buf + len, 20 );
|
|
sha1_finish( &sha1, buf + len );
|
|
}
|
|
|
|
/*
|
|
* Encryption/decryption functions
|
|
*/
|
|
static int ssl_encrypt_buf( ssl_context *ssl )
|
|
{
|
|
size_t i, padlen;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
|
|
|
|
/*
|
|
* Add MAC then encrypt
|
|
*/
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->maclen == 16 )
|
|
ssl_mac_md5( ssl->mac_enc,
|
|
ssl->out_msg, ssl->out_msglen,
|
|
ssl->out_ctr, ssl->out_msgtype );
|
|
|
|
if( ssl->maclen == 20 )
|
|
ssl_mac_sha1( ssl->mac_enc,
|
|
ssl->out_msg, ssl->out_msglen,
|
|
ssl->out_ctr, ssl->out_msgtype );
|
|
}
|
|
else
|
|
{
|
|
if( ssl->maclen == 16 )
|
|
md5_hmac( ssl->mac_enc, 16,
|
|
ssl->out_ctr, ssl->out_msglen + 13,
|
|
ssl->out_msg + ssl->out_msglen );
|
|
|
|
if( ssl->maclen == 20 )
|
|
sha1_hmac( ssl->mac_enc, 20,
|
|
ssl->out_ctr, ssl->out_msglen + 13,
|
|
ssl->out_msg + ssl->out_msglen );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 4, "computed mac",
|
|
ssl->out_msg + ssl->out_msglen, ssl->maclen );
|
|
|
|
ssl->out_msglen += ssl->maclen;
|
|
|
|
for( i = 8; i > 0; i-- )
|
|
if( ++ssl->out_ctr[i - 1] != 0 )
|
|
break;
|
|
|
|
if( ssl->ivlen == 0 )
|
|
{
|
|
#if defined(POLARSSL_ARC4_C)
|
|
padlen = 0;
|
|
|
|
SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
|
|
"including %d bytes of padding",
|
|
ssl->out_msglen, 0 ) );
|
|
|
|
SSL_DEBUG_BUF( 4, "before encrypt: output payload",
|
|
ssl->out_msg, ssl->out_msglen );
|
|
|
|
arc4_crypt( (arc4_context *) ssl->ctx_enc,
|
|
ssl->out_msglen, ssl->out_msg,
|
|
ssl->out_msg );
|
|
#else
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
unsigned char *enc_msg;
|
|
size_t enc_msglen;
|
|
|
|
padlen = ssl->ivlen - ( ssl->out_msglen + 1 ) % ssl->ivlen;
|
|
if( padlen == ssl->ivlen )
|
|
padlen = 0;
|
|
|
|
for( i = 0; i <= padlen; i++ )
|
|
ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
|
|
|
|
ssl->out_msglen += padlen + 1;
|
|
|
|
enc_msglen = ssl->out_msglen;
|
|
enc_msg = ssl->out_msg;
|
|
|
|
/*
|
|
* Prepend per-record IV for block cipher in TLS v1.1 as per
|
|
* Method 1 (6.2.3.2. in RFC4346)
|
|
*/
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_2 )
|
|
{
|
|
/*
|
|
* Generate IV
|
|
*/
|
|
for( i = 0; i < ssl->ivlen; i++ )
|
|
ssl->iv_enc[i] = ssl->f_rng( ssl->p_rng );
|
|
|
|
/*
|
|
* Shift message for ivlen bytes and prepend IV
|
|
*/
|
|
memmove( ssl->out_msg + ssl->ivlen, ssl->out_msg, ssl->out_msglen );
|
|
memcpy( ssl->out_msg, ssl->iv_enc, ssl->ivlen );
|
|
|
|
/*
|
|
* Fix pointer positions and message length with added IV
|
|
*/
|
|
enc_msg = ssl->out_msg + ssl->ivlen;
|
|
enc_msglen = ssl->out_msglen;
|
|
ssl->out_msglen += ssl->ivlen;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
|
|
"including %d bytes of IV and %d bytes of padding",
|
|
ssl->out_msglen, ssl->ivlen, padlen + 1 ) );
|
|
|
|
SSL_DEBUG_BUF( 4, "before encrypt: output payload",
|
|
ssl->out_msg, ssl->out_msglen );
|
|
|
|
switch( ssl->ivlen )
|
|
{
|
|
case 8:
|
|
#if defined(POLARSSL_DES_C)
|
|
des3_crypt_cbc( (des3_context *) ssl->ctx_enc,
|
|
DES_ENCRYPT, enc_msglen,
|
|
ssl->iv_enc, enc_msg, enc_msg );
|
|
break;
|
|
#endif
|
|
|
|
case 16:
|
|
#if defined(POLARSSL_AES_C)
|
|
if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_RSA_AES_256_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA)
|
|
{
|
|
aes_crypt_cbc( (aes_context *) ssl->ctx_enc,
|
|
AES_ENCRYPT, enc_msglen,
|
|
ssl->iv_enc, enc_msg, enc_msg);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA)
|
|
{
|
|
camellia_crypt_cbc( (camellia_context *) ssl->ctx_enc,
|
|
CAMELLIA_ENCRYPT, enc_msglen,
|
|
ssl->iv_enc, enc_msg, enc_msg );
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_decrypt_buf( ssl_context *ssl )
|
|
{
|
|
size_t i, padlen;
|
|
unsigned char tmp[20];
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
|
|
|
|
if( ssl->in_msglen < ssl->minlen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
|
|
ssl->in_msglen, ssl->minlen ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
if( ssl->ivlen == 0 )
|
|
{
|
|
#if defined(POLARSSL_ARC4_C)
|
|
padlen = 0;
|
|
arc4_crypt( (arc4_context *) ssl->ctx_dec,
|
|
ssl->in_msglen, ssl->in_msg,
|
|
ssl->in_msg );
|
|
#else
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
unsigned char *dec_msg;
|
|
unsigned char *dec_msg_result;
|
|
size_t dec_msglen;
|
|
|
|
/*
|
|
* Decrypt and check the padding
|
|
*/
|
|
if( ssl->in_msglen % ssl->ivlen != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
|
|
ssl->in_msglen, ssl->ivlen ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
dec_msglen = ssl->in_msglen;
|
|
dec_msg = ssl->in_msg;
|
|
dec_msg_result = ssl->in_msg;
|
|
|
|
/*
|
|
* Initialize for prepended IV for block cipher in TLS v1.1
|
|
*/
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_2 )
|
|
{
|
|
dec_msg += ssl->ivlen;
|
|
dec_msglen -= ssl->ivlen;
|
|
ssl->in_msglen -= ssl->ivlen;
|
|
|
|
for( i = 0; i < ssl->ivlen; i++ )
|
|
ssl->iv_dec[i] = ssl->in_msg[i];
|
|
}
|
|
|
|
switch( ssl->ivlen )
|
|
{
|
|
#if defined(POLARSSL_DES_C)
|
|
case 8:
|
|
des3_crypt_cbc( (des3_context *) ssl->ctx_dec,
|
|
DES_DECRYPT, dec_msglen,
|
|
ssl->iv_dec, dec_msg, dec_msg_result );
|
|
break;
|
|
#endif
|
|
|
|
case 16:
|
|
#if defined(POLARSSL_AES_C)
|
|
if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_RSA_AES_256_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA)
|
|
{
|
|
aes_crypt_cbc( (aes_context *) ssl->ctx_dec,
|
|
AES_DECRYPT, dec_msglen,
|
|
ssl->iv_dec, dec_msg, dec_msg_result );
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA)
|
|
{
|
|
camellia_crypt_cbc( (camellia_context *) ssl->ctx_dec,
|
|
CAMELLIA_DECRYPT, dec_msglen,
|
|
ssl->iv_dec, dec_msg, dec_msg_result );
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( padlen > ssl->ivlen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
|
|
"should be no more than %d",
|
|
padlen, ssl->ivlen ) );
|
|
padlen = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* TLSv1: always check the padding
|
|
*/
|
|
for( i = 1; i <= padlen; i++ )
|
|
{
|
|
if( ssl->in_msg[ssl->in_msglen - i] != padlen - 1 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad padding byte: should be "
|
|
"%02x, but is %02x", padlen - 1,
|
|
ssl->in_msg[ssl->in_msglen - i] ) );
|
|
padlen = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 4, "raw buffer after decryption",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
|
|
/*
|
|
* Always compute the MAC (RFC4346, CBCTIME).
|
|
*/
|
|
ssl->in_msglen -= ( ssl->maclen + padlen );
|
|
|
|
ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 );
|
|
ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen );
|
|
|
|
memcpy( tmp, ssl->in_msg + ssl->in_msglen, 20 );
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->maclen == 16 )
|
|
ssl_mac_md5( ssl->mac_dec,
|
|
ssl->in_msg, ssl->in_msglen,
|
|
ssl->in_ctr, ssl->in_msgtype );
|
|
else
|
|
ssl_mac_sha1( ssl->mac_dec,
|
|
ssl->in_msg, ssl->in_msglen,
|
|
ssl->in_ctr, ssl->in_msgtype );
|
|
}
|
|
else
|
|
{
|
|
if( ssl->maclen == 16 )
|
|
md5_hmac( ssl->mac_dec, 16,
|
|
ssl->in_ctr, ssl->in_msglen + 13,
|
|
ssl->in_msg + ssl->in_msglen );
|
|
else
|
|
sha1_hmac( ssl->mac_dec, 20,
|
|
ssl->in_ctr, ssl->in_msglen + 13,
|
|
ssl->in_msg + ssl->in_msglen );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->maclen );
|
|
SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen,
|
|
ssl->maclen );
|
|
|
|
if( memcmp( tmp, ssl->in_msg + ssl->in_msglen,
|
|
ssl->maclen ) != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_MAC );
|
|
}
|
|
|
|
/*
|
|
* Finally check the padding length; bad padding
|
|
* will produce the same error as an invalid MAC.
|
|
*/
|
|
if( ssl->ivlen != 0 && padlen == 0 )
|
|
return( POLARSSL_ERR_SSL_INVALID_MAC );
|
|
|
|
if( ssl->in_msglen == 0 )
|
|
{
|
|
ssl->nb_zero++;
|
|
|
|
/*
|
|
* Three or more empty messages may be a DoS attack
|
|
* (excessive CPU consumption).
|
|
*/
|
|
if( ssl->nb_zero > 3 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
|
|
"messages, possible DoS attack" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_MAC );
|
|
}
|
|
}
|
|
else
|
|
ssl->nb_zero = 0;
|
|
|
|
for( i = 8; i > 0; i-- )
|
|
if( ++ssl->in_ctr[i - 1] != 0 )
|
|
break;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Fill the input message buffer
|
|
*/
|
|
int ssl_fetch_input( ssl_context *ssl, size_t nb_want )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
|
|
|
|
while( ssl->in_left < nb_want )
|
|
{
|
|
len = nb_want - ssl->in_left;
|
|
ret = ssl->f_recv( ssl->p_recv, ssl->in_hdr + ssl->in_left, len );
|
|
|
|
SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
|
|
ssl->in_left, nb_want ) );
|
|
SSL_DEBUG_RET( 2, "ssl->f_recv", ret );
|
|
|
|
if( ret == 0 )
|
|
return( POLARSSL_ERR_SSL_CONN_EOF );
|
|
|
|
if( ret < 0 )
|
|
return( ret );
|
|
|
|
ssl->in_left += ret;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Flush any data not yet written
|
|
*/
|
|
int ssl_flush_output( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *buf;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
|
|
|
|
while( ssl->out_left > 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
|
|
5 + ssl->out_msglen, ssl->out_left ) );
|
|
|
|
buf = ssl->out_hdr + 5 + ssl->out_msglen - ssl->out_left;
|
|
ret = ssl->f_send( ssl->p_send, buf, ssl->out_left );
|
|
SSL_DEBUG_RET( 2, "ssl->f_send", ret );
|
|
|
|
if( ret <= 0 )
|
|
return( ret );
|
|
|
|
ssl->out_left -= ret;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Record layer functions
|
|
*/
|
|
int ssl_write_record( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t len = ssl->out_msglen;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write record" ) );
|
|
|
|
ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
|
|
ssl->out_hdr[1] = (unsigned char) ssl->major_ver;
|
|
ssl->out_hdr[2] = (unsigned char) ssl->minor_ver;
|
|
ssl->out_hdr[3] = (unsigned char)( len >> 8 );
|
|
ssl->out_hdr[4] = (unsigned char)( len );
|
|
|
|
if( ssl->out_msgtype == SSL_MSG_HANDSHAKE )
|
|
{
|
|
ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
|
|
ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
|
|
ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
|
|
|
|
md5_update( &ssl->fin_md5 , ssl->out_msg, len );
|
|
sha1_update( &ssl->fin_sha1, ssl->out_msg, len );
|
|
}
|
|
|
|
if( ssl->do_crypt != 0 )
|
|
{
|
|
if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
len = ssl->out_msglen;
|
|
ssl->out_hdr[3] = (unsigned char)( len >> 8 );
|
|
ssl->out_hdr[4] = (unsigned char)( len );
|
|
}
|
|
|
|
ssl->out_left = 5 + ssl->out_msglen;
|
|
|
|
SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
|
|
"version = [%d:%d], msglen = %d",
|
|
ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
|
|
( ssl->out_hdr[3] << 8 ) | ssl->out_hdr[4] ) );
|
|
|
|
SSL_DEBUG_BUF( 4, "output record sent to network",
|
|
ssl->out_hdr, 5 + ssl->out_msglen );
|
|
|
|
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write record" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_read_record( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> read record" ) );
|
|
|
|
if( ssl->in_hslen != 0 &&
|
|
ssl->in_hslen < ssl->in_msglen )
|
|
{
|
|
/*
|
|
* Get next Handshake message in the current record
|
|
*/
|
|
ssl->in_msglen -= ssl->in_hslen;
|
|
|
|
memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
|
|
ssl->in_msglen );
|
|
|
|
ssl->in_hslen = 4;
|
|
ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3];
|
|
|
|
SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
|
|
" %d, type = %d, hslen = %d",
|
|
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
|
|
|
|
if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( ssl->in_msglen < ssl->in_hslen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
md5_update( &ssl->fin_md5 , ssl->in_msg, ssl->in_hslen );
|
|
sha1_update( &ssl->fin_sha1, ssl->in_msg, ssl->in_hslen );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
ssl->in_hslen = 0;
|
|
|
|
/*
|
|
* Read the record header and validate it
|
|
*/
|
|
if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->in_msgtype = ssl->in_hdr[0];
|
|
ssl->in_msglen = ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4];
|
|
|
|
SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
|
|
"version = [%d:%d], msglen = %d",
|
|
ssl->in_hdr[0], ssl->in_hdr[1], ssl->in_hdr[2],
|
|
( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4] ) );
|
|
|
|
if( ssl->in_hdr[1] != ssl->major_ver )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( ssl->in_hdr[2] > ssl->max_minor_ver )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
/*
|
|
* Make sure the message length is acceptable
|
|
*/
|
|
if( ssl->do_crypt == 0 )
|
|
{
|
|
if( ssl->in_msglen < 1 ||
|
|
ssl->in_msglen > SSL_MAX_CONTENT_LEN )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ssl->in_msglen < ssl->minlen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_0 &&
|
|
ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
/*
|
|
* TLS encrypted messages can have up to 256 bytes of padding
|
|
*/
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_1 &&
|
|
ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN + 256 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read and optionally decrypt the message contents
|
|
*/
|
|
if( ( ret = ssl_fetch_input( ssl, 5 + ssl->in_msglen ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 4, "input record from network",
|
|
ssl->in_hdr, 5 + ssl->in_msglen );
|
|
|
|
if( ssl->do_crypt != 0 )
|
|
{
|
|
if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 4, "input payload after decrypt",
|
|
ssl->in_msg, ssl->in_msglen );
|
|
|
|
if( ssl->in_msglen > SSL_MAX_CONTENT_LEN )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad message length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_msgtype == SSL_MSG_HANDSHAKE )
|
|
{
|
|
ssl->in_hslen = 4;
|
|
ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3];
|
|
|
|
SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
|
|
" %d, type = %d, hslen = %d",
|
|
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
|
|
|
|
/*
|
|
* Additional checks to validate the handshake header
|
|
*/
|
|
if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
if( ssl->in_msglen < ssl->in_hslen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad handshake length" ) );
|
|
return( POLARSSL_ERR_SSL_INVALID_RECORD );
|
|
}
|
|
|
|
md5_update( &ssl->fin_md5 , ssl->in_msg, ssl->in_hslen );
|
|
sha1_update( &ssl->fin_sha1, ssl->in_msg, ssl->in_hslen );
|
|
}
|
|
|
|
if( ssl->in_msgtype == SSL_MSG_ALERT )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
|
|
ssl->in_msg[0], ssl->in_msg[1] ) );
|
|
|
|
/*
|
|
* Ignore non-fatal alerts, except close_notify
|
|
*/
|
|
if( ssl->in_msg[0] == SSL_ALERT_LEVEL_FATAL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "is a fatal alert message" ) );
|
|
/**
|
|
* Subtract from error code as ssl->in_msg[1] is 7-bit positive
|
|
* error identifier.
|
|
*/
|
|
return( POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE - ssl->in_msg[1] );
|
|
}
|
|
|
|
if( ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == SSL_ALERT_MSG_CLOSE_NOTIFY )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
|
|
return( POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY );
|
|
}
|
|
}
|
|
|
|
ssl->in_left = 0;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= read record" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Handshake functions
|
|
*/
|
|
int ssl_write_certificate( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t i, n;
|
|
const x509_cert *crt;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
|
|
|
|
if( ssl->endpoint == SSL_IS_CLIENT )
|
|
{
|
|
if( ssl->client_auth == 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* If using SSLv3 and got no cert, send an Alert message
|
|
* (otherwise an empty Certificate message will be sent).
|
|
*/
|
|
if( ssl->own_cert == NULL &&
|
|
ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
ssl->out_msglen = 2;
|
|
ssl->out_msgtype = SSL_MSG_ALERT;
|
|
ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING;
|
|
ssl->out_msg[1] = SSL_ALERT_MSG_NO_CERT;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
|
|
goto write_msg;
|
|
}
|
|
}
|
|
else /* SSL_IS_SERVER */
|
|
{
|
|
if( ssl->own_cert == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
|
|
return( POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED );
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_CRT( 3, "own certificate", ssl->own_cert );
|
|
|
|
/*
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 6 length of all certs
|
|
* 7 . 9 length of cert. 1
|
|
* 10 . n-1 peer certificate
|
|
* n . n+2 length of cert. 2
|
|
* n+3 . ... upper level cert, etc.
|
|
*/
|
|
i = 7;
|
|
crt = ssl->own_cert;
|
|
|
|
while( crt != NULL )
|
|
{
|
|
n = crt->raw.len;
|
|
if( i + 3 + n > SSL_MAX_CONTENT_LEN )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
|
|
i + 3 + n, SSL_MAX_CONTENT_LEN ) );
|
|
return( POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE );
|
|
}
|
|
|
|
ssl->out_msg[i ] = (unsigned char)( n >> 16 );
|
|
ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
|
|
ssl->out_msg[i + 2] = (unsigned char)( n );
|
|
|
|
i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
|
|
i += n; crt = crt->next;
|
|
}
|
|
|
|
ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
|
|
ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
|
|
ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
|
|
|
|
ssl->out_msglen = i;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_CERTIFICATE;
|
|
|
|
write_msg:
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_parse_certificate( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t i, n;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
|
|
|
|
if( ssl->endpoint == SSL_IS_SERVER &&
|
|
ssl->authmode == SSL_VERIFY_NONE )
|
|
{
|
|
ssl->verify_result = BADCERT_SKIP_VERIFY;
|
|
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
/*
|
|
* Check if the client sent an empty certificate
|
|
*/
|
|
if( ssl->endpoint == SSL_IS_SERVER &&
|
|
ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->in_msglen == 2 &&
|
|
ssl->in_msgtype == SSL_MSG_ALERT &&
|
|
ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING &&
|
|
ssl->in_msg[1] == SSL_ALERT_MSG_NO_CERT )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
|
|
|
|
ssl->verify_result = BADCERT_MISSING;
|
|
if( ssl->authmode == SSL_VERIFY_OPTIONAL )
|
|
return( 0 );
|
|
else
|
|
return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
}
|
|
}
|
|
|
|
if( ssl->endpoint == SSL_IS_SERVER &&
|
|
ssl->minor_ver != SSL_MINOR_VERSION_0 )
|
|
{
|
|
if( ssl->in_hslen == 7 &&
|
|
ssl->in_msgtype == SSL_MSG_HANDSHAKE &&
|
|
ssl->in_msg[0] == SSL_HS_CERTIFICATE &&
|
|
memcmp( ssl->in_msg + 4, "\0\0\0", 3 ) == 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
|
|
|
|
ssl->verify_result = BADCERT_MISSING;
|
|
if( ssl->authmode == SSL_VERIFY_REQUIRED )
|
|
return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
else
|
|
return( 0 );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != SSL_HS_CERTIFICATE || ssl->in_hslen < 10 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
/*
|
|
* Same message structure as in ssl_write_certificate()
|
|
*/
|
|
n = ( ssl->in_msg[5] << 8 ) | ssl->in_msg[6];
|
|
|
|
if( ssl->in_msg[4] != 0 || ssl->in_hslen != 7 + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
if( ( ssl->peer_cert = (x509_cert *) malloc(
|
|
sizeof( x509_cert ) ) ) == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed",
|
|
sizeof( x509_cert ) ) );
|
|
return( 1 );
|
|
}
|
|
|
|
memset( ssl->peer_cert, 0, sizeof( x509_cert ) );
|
|
|
|
i = 7;
|
|
|
|
while( i < ssl->in_hslen )
|
|
{
|
|
if( ssl->in_msg[i] != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
|
|
| (unsigned int) ssl->in_msg[i + 2];
|
|
i += 3;
|
|
|
|
if( n < 128 || i + n > ssl->in_hslen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
|
|
}
|
|
|
|
ret = x509parse_crt( ssl->peer_cert, ssl->in_msg + i, n );
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, " x509parse_crt", ret );
|
|
return( ret );
|
|
}
|
|
|
|
i += n;
|
|
}
|
|
|
|
SSL_DEBUG_CRT( 3, "peer certificate", ssl->peer_cert );
|
|
|
|
if( ssl->authmode != SSL_VERIFY_NONE )
|
|
{
|
|
if( ssl->ca_chain == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
|
|
return( POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED );
|
|
}
|
|
|
|
ret = x509parse_verify( ssl->peer_cert, ssl->ca_chain, ssl->ca_crl,
|
|
ssl->peer_cn, &ssl->verify_result,
|
|
ssl->f_vrfy, ssl->p_vrfy );
|
|
|
|
if( ret != 0 )
|
|
SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
|
|
|
|
if( ssl->authmode != SSL_VERIFY_REQUIRED )
|
|
ret = 0;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
int ssl_write_change_cipher_spec( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
|
|
|
|
ssl->out_msgtype = SSL_MSG_CHANGE_CIPHER_SPEC;
|
|
ssl->out_msglen = 1;
|
|
ssl->out_msg[0] = 1;
|
|
|
|
ssl->do_crypt = 0;
|
|
ssl->state++;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_parse_change_cipher_spec( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
|
|
|
|
ssl->do_crypt = 0;
|
|
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void ssl_calc_finished(
|
|
ssl_context *ssl, unsigned char *buf, int from,
|
|
md5_context *md5, sha1_context *sha1 )
|
|
{
|
|
int len = 12;
|
|
char *sender;
|
|
unsigned char padbuf[48];
|
|
unsigned char md5sum[16];
|
|
unsigned char sha1sum[20];
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> calc finished" ) );
|
|
|
|
/*
|
|
* SSLv3:
|
|
* hash =
|
|
* MD5( master + pad2 +
|
|
* MD5( handshake + sender + master + pad1 ) )
|
|
* + SHA1( master + pad2 +
|
|
* SHA1( handshake + sender + master + pad1 ) )
|
|
*
|
|
* TLSv1:
|
|
* hash = PRF( master, finished_label,
|
|
* MD5( handshake ) + SHA1( handshake ) )[0..11]
|
|
*/
|
|
|
|
SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
|
|
md5->state, sizeof( md5->state ) );
|
|
|
|
SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
|
|
sha1->state, sizeof( sha1->state ) );
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
|
|
{
|
|
sender = ( from == SSL_IS_CLIENT ) ? (char *) "CLNT"
|
|
: (char *) "SRVR";
|
|
|
|
memset( padbuf, 0x36, 48 );
|
|
|
|
md5_update( md5, (unsigned char *) sender, 4 );
|
|
md5_update( md5, ssl->session->master, 48 );
|
|
md5_update( md5, padbuf, 48 );
|
|
md5_finish( md5, md5sum );
|
|
|
|
sha1_update( sha1, (unsigned char *) sender, 4 );
|
|
sha1_update( sha1, ssl->session->master, 48 );
|
|
sha1_update( sha1, padbuf, 40 );
|
|
sha1_finish( sha1, sha1sum );
|
|
|
|
memset( padbuf, 0x5C, 48 );
|
|
|
|
md5_starts( md5 );
|
|
md5_update( md5, ssl->session->master, 48 );
|
|
md5_update( md5, padbuf, 48 );
|
|
md5_update( md5, md5sum, 16 );
|
|
md5_finish( md5, buf );
|
|
|
|
sha1_starts( sha1 );
|
|
sha1_update( sha1, ssl->session->master, 48 );
|
|
sha1_update( sha1, padbuf , 40 );
|
|
sha1_update( sha1, sha1sum, 20 );
|
|
sha1_finish( sha1, buf + 16 );
|
|
|
|
len += 24;
|
|
}
|
|
else
|
|
{
|
|
sender = ( from == SSL_IS_CLIENT )
|
|
? (char *) "client finished"
|
|
: (char *) "server finished";
|
|
|
|
md5_finish( md5, padbuf );
|
|
sha1_finish( sha1, padbuf + 16 );
|
|
|
|
tls1_prf( ssl->session->master, 48, sender,
|
|
padbuf, 36, buf, len );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
|
|
|
|
memset( md5, 0, sizeof( md5_context ) );
|
|
memset( sha1, 0, sizeof( sha1_context ) );
|
|
|
|
memset( padbuf, 0, sizeof( padbuf ) );
|
|
memset( md5sum, 0, sizeof( md5sum ) );
|
|
memset( sha1sum, 0, sizeof( sha1sum ) );
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
|
|
}
|
|
|
|
int ssl_write_finished( ssl_context *ssl )
|
|
{
|
|
int ret, hash_len;
|
|
md5_context md5;
|
|
sha1_context sha1;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
|
|
|
|
memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
|
|
memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
|
|
|
|
ssl_calc_finished( ssl, ssl->out_msg + 4,
|
|
ssl->endpoint, &md5, &sha1 );
|
|
|
|
hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12;
|
|
|
|
ssl->out_msglen = 4 + hash_len;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_FINISHED;
|
|
|
|
/*
|
|
* In case of session resuming, invert the client and server
|
|
* ChangeCipherSpec messages order.
|
|
*/
|
|
if( ssl->resume != 0 )
|
|
{
|
|
if( ssl->endpoint == SSL_IS_CLIENT )
|
|
ssl->state = SSL_HANDSHAKE_OVER;
|
|
else
|
|
ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
|
|
}
|
|
else
|
|
ssl->state++;
|
|
|
|
ssl->do_crypt = 1;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_parse_finished( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned int hash_len;
|
|
unsigned char buf[36];
|
|
md5_context md5;
|
|
sha1_context sha1;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
|
|
|
|
memcpy( &md5 , &ssl->fin_md5 , sizeof( md5_context ) );
|
|
memcpy( &sha1, &ssl->fin_sha1, sizeof( sha1_context ) );
|
|
|
|
ssl->do_crypt = 1;
|
|
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12;
|
|
|
|
if( ssl->in_msg[0] != SSL_HS_FINISHED ||
|
|
ssl->in_hslen != 4 + hash_len )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_FINISHED );
|
|
}
|
|
|
|
ssl_calc_finished( ssl, buf, ssl->endpoint ^ 1, &md5, &sha1 );
|
|
|
|
if( memcmp( ssl->in_msg + 4, buf, hash_len ) != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_FINISHED );
|
|
}
|
|
|
|
if( ssl->resume != 0 )
|
|
{
|
|
if( ssl->endpoint == SSL_IS_CLIENT )
|
|
ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
|
|
|
|
if( ssl->endpoint == SSL_IS_SERVER )
|
|
ssl->state = SSL_HANDSHAKE_OVER;
|
|
}
|
|
else
|
|
ssl->state++;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Initialize an SSL context
|
|
*/
|
|
int ssl_init( ssl_context *ssl )
|
|
{
|
|
int len = SSL_BUFFER_LEN;
|
|
|
|
memset( ssl, 0, sizeof( ssl_context ) );
|
|
|
|
ssl->in_ctr = (unsigned char *) malloc( len );
|
|
ssl->in_hdr = ssl->in_ctr + 8;
|
|
ssl->in_msg = ssl->in_ctr + 13;
|
|
|
|
if( ssl->in_ctr == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) );
|
|
return( 1 );
|
|
}
|
|
|
|
ssl->out_ctr = (unsigned char *) malloc( len );
|
|
ssl->out_hdr = ssl->out_ctr + 8;
|
|
ssl->out_msg = ssl->out_ctr + 13;
|
|
|
|
if( ssl->out_ctr == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) );
|
|
free( ssl-> in_ctr );
|
|
return( 1 );
|
|
}
|
|
|
|
memset( ssl-> in_ctr, 0, SSL_BUFFER_LEN );
|
|
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
|
|
|
|
ssl->hostname = NULL;
|
|
ssl->hostname_len = 0;
|
|
|
|
md5_starts( &ssl->fin_md5 );
|
|
sha1_starts( &ssl->fin_sha1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Reset an initialized and used SSL context for re-use while retaining
|
|
* all application-set variables, function pointers and data.
|
|
*/
|
|
void ssl_session_reset( ssl_context *ssl )
|
|
{
|
|
ssl->state = SSL_HELLO_REQUEST;
|
|
|
|
ssl->in_offt = NULL;
|
|
|
|
ssl->in_msgtype = 0;
|
|
ssl->in_msglen = 0;
|
|
ssl->in_left = 0;
|
|
|
|
ssl->in_hslen = 0;
|
|
ssl->nb_zero = 0;
|
|
|
|
ssl->out_msgtype = 0;
|
|
ssl->out_msglen = 0;
|
|
ssl->out_left = 0;
|
|
|
|
ssl->do_crypt = 0;
|
|
ssl->pmslen = 0;
|
|
ssl->keylen = 0;
|
|
ssl->minlen = 0;
|
|
ssl->ivlen = 0;
|
|
ssl->maclen = 0;
|
|
|
|
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
|
|
memset( ssl->in_ctr, 0, SSL_BUFFER_LEN );
|
|
memset( ssl->randbytes, 0, 64 );
|
|
memset( ssl->premaster, 0, 256 );
|
|
memset( ssl->iv_enc, 0, 16 );
|
|
memset( ssl->iv_dec, 0, 16 );
|
|
memset( ssl->mac_enc, 0, 32 );
|
|
memset( ssl->mac_dec, 0, 32 );
|
|
memset( ssl->ctx_enc, 0, 128 );
|
|
memset( ssl->ctx_dec, 0, 128 );
|
|
|
|
md5_starts( &ssl->fin_md5 );
|
|
sha1_starts( &ssl->fin_sha1 );
|
|
}
|
|
|
|
/*
|
|
* SSL set accessors
|
|
*/
|
|
void ssl_set_endpoint( ssl_context *ssl, int endpoint )
|
|
{
|
|
ssl->endpoint = endpoint;
|
|
}
|
|
|
|
void ssl_set_authmode( ssl_context *ssl, int authmode )
|
|
{
|
|
ssl->authmode = authmode;
|
|
}
|
|
|
|
void ssl_set_verify( ssl_context *ssl,
|
|
int (*f_vrfy)(void *, x509_cert *, int, int),
|
|
void *p_vrfy )
|
|
{
|
|
ssl->f_vrfy = f_vrfy;
|
|
ssl->p_vrfy = p_vrfy;
|
|
}
|
|
|
|
void ssl_set_rng( ssl_context *ssl,
|
|
int (*f_rng)(void *),
|
|
void *p_rng )
|
|
{
|
|
ssl->f_rng = f_rng;
|
|
ssl->p_rng = p_rng;
|
|
}
|
|
|
|
void ssl_set_dbg( ssl_context *ssl,
|
|
void (*f_dbg)(void *, int, const char *),
|
|
void *p_dbg )
|
|
{
|
|
ssl->f_dbg = f_dbg;
|
|
ssl->p_dbg = p_dbg;
|
|
}
|
|
|
|
void ssl_set_bio( ssl_context *ssl,
|
|
int (*f_recv)(void *, unsigned char *, size_t), void *p_recv,
|
|
int (*f_send)(void *, const unsigned char *, size_t), void *p_send )
|
|
{
|
|
ssl->f_recv = f_recv;
|
|
ssl->f_send = f_send;
|
|
ssl->p_recv = p_recv;
|
|
ssl->p_send = p_send;
|
|
}
|
|
|
|
void ssl_set_scb( ssl_context *ssl,
|
|
int (*s_get)(ssl_context *),
|
|
int (*s_set)(ssl_context *) )
|
|
{
|
|
ssl->s_get = s_get;
|
|
ssl->s_set = s_set;
|
|
}
|
|
|
|
void ssl_set_session( ssl_context *ssl, int resume, int timeout,
|
|
ssl_session *session )
|
|
{
|
|
ssl->resume = resume;
|
|
ssl->timeout = timeout;
|
|
ssl->session = session;
|
|
}
|
|
|
|
void ssl_set_ciphersuites( ssl_context *ssl, int *ciphersuites )
|
|
{
|
|
ssl->ciphersuites = ciphersuites;
|
|
}
|
|
|
|
void ssl_set_ca_chain( ssl_context *ssl, x509_cert *ca_chain,
|
|
x509_crl *ca_crl, const char *peer_cn )
|
|
{
|
|
ssl->ca_chain = ca_chain;
|
|
ssl->ca_crl = ca_crl;
|
|
ssl->peer_cn = peer_cn;
|
|
}
|
|
|
|
void ssl_set_own_cert( ssl_context *ssl, x509_cert *own_cert,
|
|
rsa_context *rsa_key )
|
|
{
|
|
ssl->own_cert = own_cert;
|
|
ssl->rsa_key = rsa_key;
|
|
}
|
|
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
void ssl_set_own_cert_pkcs11( ssl_context *ssl, x509_cert *own_cert,
|
|
pkcs11_context *pkcs11_key )
|
|
{
|
|
ssl->own_cert = own_cert;
|
|
ssl->pkcs11_key = pkcs11_key;
|
|
}
|
|
#endif
|
|
|
|
int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mpi_read_string( &ssl->dhm_ctx.P, 16, dhm_P ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "mpi_read_string", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mpi_read_string( &ssl->dhm_ctx.G, 16, dhm_G ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "mpi_read_string", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = mpi_copy(&ssl->dhm_ctx.P, &dhm_ctx->P) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "mpi_copy", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mpi_copy(&ssl->dhm_ctx.G, &dhm_ctx->G) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "mpi_copy", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int ssl_set_hostname( ssl_context *ssl, const char *hostname )
|
|
{
|
|
if( hostname == NULL )
|
|
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
ssl->hostname_len = strlen( hostname );
|
|
ssl->hostname = (unsigned char *) malloc( ssl->hostname_len + 1 );
|
|
|
|
memcpy( ssl->hostname, (unsigned char *) hostname,
|
|
ssl->hostname_len );
|
|
|
|
ssl->hostname[ssl->hostname_len] = '\0';
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
void ssl_set_max_version( ssl_context *ssl, int major, int minor )
|
|
{
|
|
ssl->max_major_ver = major;
|
|
ssl->max_minor_ver = minor;
|
|
}
|
|
|
|
/*
|
|
* SSL get accessors
|
|
*/
|
|
size_t ssl_get_bytes_avail( const ssl_context *ssl )
|
|
{
|
|
return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
|
|
}
|
|
|
|
int ssl_get_verify_result( const ssl_context *ssl )
|
|
{
|
|
return( ssl->verify_result );
|
|
}
|
|
|
|
const char *ssl_get_ciphersuite_name( const int ciphersuite_id )
|
|
{
|
|
switch( ciphersuite_id )
|
|
{
|
|
#if defined(POLARSSL_ARC4_C)
|
|
case SSL_RSA_RC4_128_MD5:
|
|
return( "SSL-RSA-RC4-128-MD5" );
|
|
|
|
case SSL_RSA_RC4_128_SHA:
|
|
return( "SSL-RSA-RC4-128-SHA" );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
case SSL_RSA_DES_168_SHA:
|
|
return( "SSL-RSA-DES-168-SHA" );
|
|
|
|
case SSL_EDH_RSA_DES_168_SHA:
|
|
return( "SSL-EDH-RSA-DES-168-SHA" );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_AES_C)
|
|
case SSL_RSA_AES_128_SHA:
|
|
return( "SSL-RSA-AES-128-SHA" );
|
|
|
|
case SSL_EDH_RSA_AES_128_SHA:
|
|
return( "SSL-EDH-RSA-AES-128-SHA" );
|
|
|
|
case SSL_RSA_AES_256_SHA:
|
|
return( "SSL-RSA-AES-256-SHA" );
|
|
|
|
case SSL_EDH_RSA_AES_256_SHA:
|
|
return( "SSL-EDH-RSA-AES-256-SHA" );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
case SSL_RSA_CAMELLIA_128_SHA:
|
|
return( "SSL-RSA-CAMELLIA-128-SHA" );
|
|
|
|
case SSL_EDH_RSA_CAMELLIA_128_SHA:
|
|
return( "SSL-EDH-RSA-CAMELLIA-128-SHA" );
|
|
|
|
case SSL_RSA_CAMELLIA_256_SHA:
|
|
return( "SSL-RSA-CAMELLIA-256-SHA" );
|
|
|
|
case SSL_EDH_RSA_CAMELLIA_256_SHA:
|
|
return( "SSL-EDH-RSA-CAMELLIA-256-SHA" );
|
|
#endif
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return( "unknown" );
|
|
}
|
|
|
|
int ssl_get_ciphersuite_id( const char *ciphersuite_name )
|
|
{
|
|
#if defined(POLARSSL_ARC4_C)
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-MD5"))
|
|
return( SSL_RSA_RC4_128_MD5 );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-SHA"))
|
|
return( SSL_RSA_RC4_128_SHA );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-DES-168-SHA"))
|
|
return( SSL_RSA_DES_168_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-DES-168-SHA"))
|
|
return( SSL_EDH_RSA_DES_168_SHA );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_AES_C)
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-128-SHA"))
|
|
return( SSL_RSA_AES_128_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-128-SHA"))
|
|
return( SSL_EDH_RSA_AES_128_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-256-SHA"))
|
|
return( SSL_RSA_AES_256_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-256-SHA"))
|
|
return( SSL_EDH_RSA_AES_256_SHA );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-128-SHA"))
|
|
return( SSL_RSA_CAMELLIA_128_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-128-SHA"))
|
|
return( SSL_EDH_RSA_CAMELLIA_128_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-256-SHA"))
|
|
return( SSL_RSA_CAMELLIA_256_SHA );
|
|
if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-256-SHA"))
|
|
return( SSL_EDH_RSA_CAMELLIA_256_SHA );
|
|
#endif
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
const char *ssl_get_ciphersuite( const ssl_context *ssl )
|
|
{
|
|
return ssl_get_ciphersuite_name( ssl->session->ciphersuite );
|
|
}
|
|
|
|
const char *ssl_get_version( const ssl_context *ssl )
|
|
{
|
|
switch( ssl->minor_ver )
|
|
{
|
|
case SSL_MINOR_VERSION_0:
|
|
return( "SSLv3.0" );
|
|
|
|
case SSL_MINOR_VERSION_1:
|
|
return( "TLSv1.0" );
|
|
|
|
case SSL_MINOR_VERSION_2:
|
|
return( "TLSv1.1" );
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return( "unknown" );
|
|
}
|
|
|
|
int ssl_default_ciphersuites[] =
|
|
{
|
|
#if defined(POLARSSL_DHM_C)
|
|
#if defined(POLARSSL_AES_C)
|
|
SSL_EDH_RSA_AES_128_SHA,
|
|
SSL_EDH_RSA_AES_256_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
SSL_EDH_RSA_CAMELLIA_128_SHA,
|
|
SSL_EDH_RSA_CAMELLIA_256_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_DES_C)
|
|
SSL_EDH_RSA_DES_168_SHA,
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(POLARSSL_AES_C)
|
|
SSL_RSA_AES_256_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
SSL_RSA_CAMELLIA_256_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_AES_C)
|
|
SSL_RSA_AES_128_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
SSL_RSA_CAMELLIA_128_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_DES_C)
|
|
SSL_RSA_DES_168_SHA,
|
|
#endif
|
|
#if defined(POLARSSL_ARC4_C)
|
|
SSL_RSA_RC4_128_SHA,
|
|
SSL_RSA_RC4_128_MD5,
|
|
#endif
|
|
0
|
|
};
|
|
|
|
/*
|
|
* Perform the SSL handshake
|
|
*/
|
|
int ssl_handshake( ssl_context *ssl )
|
|
{
|
|
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
|
|
|
|
#if defined(POLARSSL_SSL_CLI_C)
|
|
if( ssl->endpoint == SSL_IS_CLIENT )
|
|
ret = ssl_handshake_client( ssl );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_SSL_SRV_C)
|
|
if( ssl->endpoint == SSL_IS_SERVER )
|
|
ret = ssl_handshake_server( ssl );
|
|
#endif
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Receive application data decrypted from the SSL layer
|
|
*/
|
|
int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> read" ) );
|
|
|
|
if( ssl->state != SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ( ret = ssl_handshake( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_offt == NULL )
|
|
{
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_SSL_CONN_EOF )
|
|
return( 0 );
|
|
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msglen == 0 &&
|
|
ssl->in_msgtype == SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
/*
|
|
* OpenSSL sends empty messages to randomize the IV
|
|
*/
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
if( ret == POLARSSL_ERR_SSL_CONN_EOF )
|
|
return( 0 );
|
|
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_APPLICATION_DATA )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
ssl->in_offt = ssl->in_msg;
|
|
}
|
|
|
|
n = ( len < ssl->in_msglen )
|
|
? len : ssl->in_msglen;
|
|
|
|
memcpy( buf, ssl->in_offt, n );
|
|
ssl->in_msglen -= n;
|
|
|
|
if( ssl->in_msglen == 0 )
|
|
/* all bytes consumed */
|
|
ssl->in_offt = NULL;
|
|
else
|
|
/* more data available */
|
|
ssl->in_offt += n;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= read" ) );
|
|
|
|
return( (int) n );
|
|
}
|
|
|
|
/*
|
|
* Send application data to be encrypted by the SSL layer
|
|
*/
|
|
int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write" ) );
|
|
|
|
if( ssl->state != SSL_HANDSHAKE_OVER )
|
|
{
|
|
if( ( ret = ssl_handshake( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_handshake", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
n = ( len < SSL_MAX_CONTENT_LEN )
|
|
? len : SSL_MAX_CONTENT_LEN;
|
|
|
|
if( ssl->out_left != 0 )
|
|
{
|
|
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ssl->out_msglen = n;
|
|
ssl->out_msgtype = SSL_MSG_APPLICATION_DATA;
|
|
memcpy( ssl->out_msg, buf, n );
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write" ) );
|
|
|
|
return( (int) n );
|
|
}
|
|
|
|
/*
|
|
* Notify the peer that the connection is being closed
|
|
*/
|
|
int ssl_close_notify( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
|
|
|
|
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_flush_output", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->state == SSL_HANDSHAKE_OVER )
|
|
{
|
|
ssl->out_msgtype = SSL_MSG_ALERT;
|
|
ssl->out_msglen = 2;
|
|
ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING;
|
|
ssl->out_msg[1] = SSL_ALERT_MSG_CLOSE_NOTIFY;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Free an SSL context
|
|
*/
|
|
void ssl_free( ssl_context *ssl )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "=> free" ) );
|
|
|
|
if( ssl->peer_cert != NULL )
|
|
{
|
|
x509_free( ssl->peer_cert );
|
|
memset( ssl->peer_cert, 0, sizeof( x509_cert ) );
|
|
free( ssl->peer_cert );
|
|
}
|
|
|
|
if( ssl->out_ctr != NULL )
|
|
{
|
|
memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
|
|
free( ssl->out_ctr );
|
|
}
|
|
|
|
if( ssl->in_ctr != NULL )
|
|
{
|
|
memset( ssl->in_ctr, 0, SSL_BUFFER_LEN );
|
|
free( ssl->in_ctr );
|
|
}
|
|
|
|
#if defined(POLARSSL_DHM_C)
|
|
dhm_free( &ssl->dhm_ctx );
|
|
#endif
|
|
|
|
if ( ssl->hostname != NULL)
|
|
{
|
|
memset( ssl->hostname, 0, ssl->hostname_len );
|
|
free( ssl->hostname );
|
|
ssl->hostname_len = 0;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= free" ) );
|
|
|
|
/* Actually free after last debug message */
|
|
memset( ssl, 0, sizeof( ssl_context ) );
|
|
}
|
|
|
|
#endif
|