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- Better handling of extension parsing

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This commit is contained in:
Paul Bakker 2009-07-27 21:34:45 +00:00
parent b3bb6c0c66
commit c6ce838d8f
2 changed files with 26 additions and 14 deletions
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28
library/x509parse.c
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@ -614,7 +614,7 @@ static int x509_get_crt_ext( unsigned char **p,
int ret, len;
int is_critical = 1;
int is_cacert = 0;
unsigned char *end2;
unsigned char *end_ext_data, *end_ext_octet;
if( ( ret = x509_get_ext( p, end, ext ) ) != 0 )
{
@ -630,6 +630,8 @@ static int x509_get_crt_ext( unsigned char **p,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
end_ext_data = *p + len;
if( memcmp( *p, "\x06\x03\x55\x1D\x13", 5 ) != 0 )
{
*p += len;
@ -638,11 +640,11 @@ static int x509_get_crt_ext( unsigned char **p,
*p += 5;
if( ( ret = asn1_get_bool( p, end, &is_critical ) ) != 0 &&
if( ( ret = asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
if( ( ret = asn1_get_tag( p, end, &len,
if( ( ret = asn1_get_tag( p, end_ext_data, &len,
ASN1_OCTET_STRING ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
@ -651,19 +653,23 @@ static int x509_get_crt_ext( unsigned char **p,
* cA BOOLEAN DEFAULT FALSE,
* pathLenConstraint INTEGER (0..MAX) OPTIONAL }
*/
end2 = *p + len;
end_ext_octet = *p + len;
if( end_ext_octet != end_ext_data )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS |
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = asn1_get_tag( p, end2, &len,
if( ( ret = asn1_get_tag( p, end_ext_octet, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
if( *p == end2 )
if( *p == end_ext_octet )
continue;
if( ( ret = asn1_get_bool( p, end2, &is_cacert ) ) != 0 )
if( ( ret = asn1_get_bool( p, end_ext_octet, &is_cacert ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
ret = asn1_get_int( p, end2, &is_cacert );
ret = asn1_get_int( p, end_ext_octet, &is_cacert );
if( ret != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
@ -672,13 +678,13 @@ static int x509_get_crt_ext( unsigned char **p,
is_cacert = 1;
}
if( *p == end2 )
if( *p == end_ext_octet )
continue;
if( ( ret = asn1_get_int( p, end2, max_pathlen ) ) != 0 )
if( ( ret = asn1_get_int( p, end_ext_octet, max_pathlen ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS | ret );
if( *p != end2 )
if( *p != end_ext_octet )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS |
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );