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TLS compression only allocates working buffer once

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This commit is contained in:
Paul Bakker 2013-10-11 09:59:44 +02:00
parent d61cc3b246
commit 1677033bc8
3 changed files with 26 additions and 20 deletions
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1
ChangeLog
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@ -3,6 +3,7 @@ PolarSSL ChangeLog (Sorted per branch, date)
= Branch 1.3
Changes
* RSA blinding locks for a smaller amount of time
* TLS compression only allocates working buffer once
Bugfix
* Missing MSVC defines added

3
include/polarssl/ssl.h
View file

@ -667,6 +667,9 @@ struct _ssl_context
size_t out_msglen; /*!< record header: message length */
size_t out_left; /*!< amount of data not yet written */
#if defined(POLARSSL_ZLIB_SUPPORT)
unsigned char *compress_buf; /*!< zlib data buffer */
#endif
#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
unsigned char mfl_code; /*!< MaxFragmentLength chosen by us */
#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */

42
library/ssl_tls.c
View file

@ -706,6 +706,18 @@ int ssl_derive_keys( ssl_context *ssl )
//
if( session->compression == SSL_COMPRESS_DEFLATE )
{
if( ssl->compress_buf == NULL )
{
SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
ssl->compress_buf = polarssl_malloc( SSL_BUFFER_LEN );
if( ssl->compress_buf == NULL )
{
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed",
SSL_BUFFER_LEN ) );
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
}
}
SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
@ -1662,20 +1674,13 @@ static int ssl_compress_buf( ssl_context *ssl )
int ret;
unsigned char *msg_post = ssl->out_msg;
size_t len_pre = ssl->out_msglen;
unsigned char *msg_pre;
unsigned char *msg_pre = ssl->compress_buf;
SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
if( len_pre == 0 )
return( 0 );
msg_pre = (unsigned char*) polarssl_malloc( len_pre );
if( msg_pre == NULL )
{
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len_pre ) );
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
}
memcpy( msg_pre, ssl->out_msg, len_pre );
SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
@ -1698,8 +1703,6 @@ static int ssl_compress_buf( ssl_context *ssl )
ssl->out_msglen = SSL_BUFFER_LEN - ssl->transform_out->ctx_deflate.avail_out;
polarssl_free( msg_pre );
SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
ssl->out_msglen ) );
@ -1716,20 +1719,13 @@ static int ssl_decompress_buf( ssl_context *ssl )
int ret;
unsigned char *msg_post = ssl->in_msg;
size_t len_pre = ssl->in_msglen;
unsigned char *msg_pre;
unsigned char *msg_pre = ssl->compress_buf;
SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
if( len_pre == 0 )
return( 0 );
msg_pre = (unsigned char*) polarssl_malloc( len_pre );
if( msg_pre == NULL )
{
SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len_pre ) );
return( POLARSSL_ERR_SSL_MALLOC_FAILED );
}
memcpy( msg_pre, ssl->in_msg, len_pre );
SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
@ -1752,8 +1748,6 @@ static int ssl_decompress_buf( ssl_context *ssl )
ssl->in_msglen = SSL_MAX_CONTENT_LEN - ssl->transform_in->ctx_inflate.avail_out;
polarssl_free( msg_pre );
SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
ssl->in_msglen ) );
@ -4228,6 +4222,14 @@ void ssl_free( ssl_context *ssl )
polarssl_free( ssl->in_ctr );
}
#if defined(POLARSSL_ZLIB_SUPPORT)
if( ssl->compress_buf != NULL )
{
memset( ssl->compress_buf, 0, SSL_BUFFER_LEN );
polarssl_free( ssl->compress_buf );
}
#endif
#if defined(POLARSSL_DHM_C)
mpi_free( &ssl->dhm_P );
mpi_free( &ssl->dhm_G );