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Client and server now filter sent and accepted ciphersuites on minimum

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and maximum protocol version
This commit is contained in:
Paul Bakker 2013-06-29 16:01:15 +02:00
parent 59c28a2723
commit 2fbefde1d8
5 changed files with 57 additions and 23 deletions
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2
ChangeLog
View File

@ -17,6 +17,8 @@ Changes
* Moved all OID functionality to a separate module. RSA function
prototypes for the RSA sign and verify functions changed as a result
* Split up the GCM module into a starts/update/finish cycle
* Client and server now filter sent and accepted ciphersuites on minimum
and maximum protocol version
Bugfix
* Fix for MPI assembly for ARM

15
include/polarssl/ssl.h
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@ -401,6 +401,8 @@ struct _ssl_handshake_params
/*!< premaster secret */
int resume; /*!< session resume indicator*/
int max_major_ver; /*!< max. major version client*/
int max_minor_ver; /*!< max. minor version client*/
};
struct _ssl_context
@ -414,10 +416,10 @@ struct _ssl_context
int major_ver; /*!< equal to SSL_MAJOR_VERSION_3 */
int minor_ver; /*!< either 0 (SSL3) or 1 (TLS1.0) */
int max_major_ver; /*!< max. major version from client */
int max_minor_ver; /*!< max. minor version from client */
int min_major_ver; /*!< min. major version accepted */
int min_minor_ver; /*!< min. minor version accepted */
int max_major_ver; /*!< max. major version used */
int max_minor_ver; /*!< max. minor version used */
int min_major_ver; /*!< min. major version used */
int min_minor_ver; /*!< min. minor version used */
/*
* Callbacks (RNG, debug, I/O, verification)
@ -911,6 +913,11 @@ void ssl_set_sni( ssl_context *ssl,
/**
* \brief Set the maximum supported version sent from the client side
* and/or accepted at the server side
* (Default: SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3)
*
* Note: This prevents ciphersuites from 'higher' versions to
* be ignored.
*
* \param ssl SSL context
* \param major Major version number (only SSL_MAJOR_VERSION_3 supported)

34
library/ssl_cli.c
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@ -255,9 +255,10 @@ static int ssl_write_client_hello( ssl_context *ssl )
int ret;
size_t i, n, olen, ext_len = 0;
unsigned char *buf;
unsigned char *p;
unsigned char *p, *q;
time_t t;
const int *ciphersuites;
const ssl_ciphersuite_t *ciphersuite_info;
SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
@ -331,10 +332,11 @@ static int ssl_write_client_hello( ssl_context *ssl )
SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
ciphersuites = ssl->ciphersuite_list[ssl->minor_ver];
for( n = 0; ciphersuites[n] != 0; n++ );
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) n++;
*p++ = (unsigned char)( n >> 7 );
*p++ = (unsigned char)( n << 1 );
n = 0;
q = p;
// Skip writing ciphersuite length for now
p += 2;
/*
* Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
@ -343,20 +345,34 @@ static int ssl_write_client_hello( ssl_context *ssl )
{
*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO );
n--;
n++;
}
SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
for( i = 0; i < n; i++ )
for( i = 0; ciphersuites[i] != 0; i++ )
{
ciphersuite_info = ssl_ciphersuite_from_id( ciphersuites[i] );
if( ciphersuite_info == NULL )
continue;
if( ciphersuite_info->min_minor_ver > ssl->max_minor_ver ||
ciphersuite_info->max_minor_ver < ssl->min_minor_ver )
continue;
SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d",
ciphersuites[i] ) );
n++;
*p++ = (unsigned char)( ciphersuites[i] >> 8 );
*p++ = (unsigned char)( ciphersuites[i] );
}
*q++ = (unsigned char)( n >> 7 );
*q++ = (unsigned char)( n << 1 );
SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
#if defined(POLARSSL_ZLIB_SUPPORT)
SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",

27
library/ssl_srv.c
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@ -323,8 +323,8 @@ static int ssl_parse_client_hello_v2( ssl_context *ssl )
}
ssl->major_ver = SSL_MAJOR_VERSION_3;
ssl->minor_ver = ( buf[4] <= SSL_MINOR_VERSION_3 )
? buf[4] : SSL_MINOR_VERSION_3;
ssl->minor_ver = ( buf[4] <= ssl->max_minor_ver )
? buf[4] : ssl->max_minor_ver;
if( ssl->minor_ver < ssl->min_minor_ver )
{
@ -337,8 +337,8 @@ static int ssl_parse_client_hello_v2( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
}
ssl->max_major_ver = buf[3];
ssl->max_minor_ver = buf[4];
ssl->handshake->max_major_ver = buf[3];
ssl->handshake->max_minor_ver = buf[4];
if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 )
{
@ -453,6 +453,9 @@ static int ssl_parse_client_hello_v2( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
}
if( ciphersuite_info->min_minor_ver > ssl->minor_ver ||
ciphersuite_info->max_minor_ver < ssl->minor_ver )
continue;
goto have_ciphersuite_v2;
}
@ -602,8 +605,8 @@ static int ssl_parse_client_hello( ssl_context *ssl )
}
ssl->major_ver = SSL_MAJOR_VERSION_3;
ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_3 )
? buf[5] : SSL_MINOR_VERSION_3;
ssl->minor_ver = ( buf[5] <= ssl->max_minor_ver )
? buf[5] : ssl->max_minor_ver;
if( ssl->minor_ver < ssl->min_minor_ver )
{
@ -617,8 +620,8 @@ static int ssl_parse_client_hello( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
}
ssl->max_major_ver = buf[4];
ssl->max_minor_ver = buf[5];
ssl->handshake->max_major_ver = buf[4];
ssl->handshake->max_minor_ver = buf[5];
memcpy( ssl->handshake->randbytes, buf + 6, 32 );
@ -870,6 +873,10 @@ static int ssl_parse_client_hello( ssl_context *ssl )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
}
if( ciphersuite_info->min_minor_ver > ssl->minor_ver ||
ciphersuite_info->max_minor_ver < ssl->minor_ver )
continue;
if( ( ciphersuite_info->flags & POLARSSL_CIPHERSUITE_EC ) &&
ssl->handshake->ec_curve == 0 )
continue;
@ -1575,8 +1582,8 @@ static int ssl_parse_encrypted_pms_secret( ssl_context *ssl )
}
if( ret != 0 || ssl->handshake->pmslen != 48 ||
ssl->handshake->premaster[0] != ssl->max_major_ver ||
ssl->handshake->premaster[1] != ssl->max_minor_ver )
ssl->handshake->premaster[0] != ssl->handshake->max_major_ver ||
ssl->handshake->premaster[1] != ssl->handshake->max_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );

2
library/ssl_tls.c
View File

@ -2756,6 +2756,8 @@ int ssl_init( ssl_context *ssl )
ssl->min_major_ver = SSL_MAJOR_VERSION_3;
ssl->min_minor_ver = SSL_MINOR_VERSION_0;
ssl->max_major_ver = SSL_MAJOR_VERSION_3;
ssl->max_minor_ver = SSL_MINOR_VERSION_3;
ssl_set_ciphersuites( ssl, ssl_list_ciphersuites() );