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Enforce our choice of allowed curves.

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This commit is contained in:
Manuel Pégourié-Gonnard 2014-02-04 16:18:07 +01:00
parent 7f38ed0bfa
commit ab24010b54
3 changed files with 52 additions and 6 deletions
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17
library/ssl_cli.c
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@ -1125,14 +1125,17 @@ static int ssl_parse_server_dh_params( ssl_context *ssl, unsigned char **p,
defined(POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
static int ssl_check_server_ecdh_params( const ssl_context *ssl )
{
// TODO: print name instead
SSL_DEBUG_MSG( 2, ( "ECDH curve size: %d",
(int) ssl->handshake->ecdh_ctx.grp.nbits ) );
#if defined(POLARSSL_SSL_ECP_SET_CURVES)
if( ! ssl_curve_is_acceptable( ssl, ssl->handshake->ecdh_ctx.grp.id ) )
#else
if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
ssl->handshake->ecdh_ctx.grp.nbits > 521 )
{
#endif
return( -1 );
}
SSL_DEBUG_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.Qp );
@ -1167,7 +1170,7 @@ static int ssl_parse_server_ecdh_params( ssl_context *ssl,
if( ssl_check_server_ecdh_params( ssl ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDH length)" ) );
SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
@ -1355,7 +1358,7 @@ static int ssl_get_ecdh_params_from_cert( ssl_context *ssl )
if( ssl_check_server_ecdh_params( ssl ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH length)" ) );
SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
}
@ -1397,7 +1400,11 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDH_RSA ||
ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDH_ECDSA )
{
ssl_get_ecdh_params_from_cert( ssl );
if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret );
return( ret );
}
SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
ssl->state++;