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Small internal changes in curve checking

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- switch from is_acceptable to the more usual check
- add NULL check just in case user screwed up config
This commit is contained in:
Manuel Pégourié-Gonnard 2015-06-17 12:10:46 +02:00
parent a83e4e2bf5
commit 9d412d872c
3 changed files with 10 additions and 7 deletions
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2
include/mbedtls/ssl_internal.h
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@ -376,7 +376,7 @@ mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig );
mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash ); mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash );
#if defined(MBEDTLS_ECP_C) #if defined(MBEDTLS_ECP_C)
int mbedtls_ssl_curve_is_acceptable( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ); int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id );
#endif #endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_X509_CRT_PARSE_C)

2
library/ssl_cli.c
View file

@ -1684,7 +1684,7 @@ static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
#if defined(MBEDTLS_ECP_C) #if defined(MBEDTLS_ECP_C)
if( ! mbedtls_ssl_curve_is_acceptable( ssl, ssl->handshake->ecdh_ctx.grp.id ) ) if( mbedtls_ssl_check_curve( ssl, ssl->handshake->ecdh_ctx.grp.id ) != 0 )
#else #else
if( ssl->handshake->ecdh_ctx.grp.nbits < 163 || if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
ssl->handshake->ecdh_ctx.grp.nbits > 521 ) ssl->handshake->ecdh_ctx.grp.nbits > 521 )

13
library/ssl_tls.c
View file

@ -4087,7 +4087,7 @@ int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
/* If certificate uses an EC key, make sure the curve is OK */ /* If certificate uses an EC key, make sure the curve is OK */
if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
! mbedtls_ssl_curve_is_acceptable( ssl, mbedtls_pk_ec( *pk )->grp.id ) ) mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
if( ret == 0 ) if( ret == 0 )
@ -6807,17 +6807,20 @@ mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
#if defined(MBEDTLS_ECP_C) #if defined(MBEDTLS_ECP_C)
/* /*
* Check is a curve proposed by the peer is in our list. * Check is a curve proposed by the peer is in our list.
* Return 1 if we're willing to use it, 0 otherwise. * Return 0 if we're willing to use it, -1 otherwise.
*/ */
int mbedtls_ssl_curve_is_acceptable( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
{ {
const mbedtls_ecp_group_id *gid; const mbedtls_ecp_group_id *gid;
if( ssl->conf->curve_list == NULL )
return( -1 );
for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
if( *gid == grp_id ) if( *gid == grp_id )
return( 1 ); return( 0 );
return( 0 ); return( -1 );
} }
#endif /* MBEDTLS_ECP_C */ #endif /* MBEDTLS_ECP_C */