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Rationalize snprintf() usage in X.509 modules

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This commit is contained in:
Manuel Pégourié-Gonnard
2015-06-22 11:12:02 +02:00
parent 7b6dcbe993
commit 1685368408
6 changed files with 61 additions and 262 deletions
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76
library/x509_crl.c
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@ -569,58 +569,6 @@ int mbedtls_x509_crl_parse_file( mbedtls_x509_crl *chain, const char *path )
}
#endif /* MBEDTLS_FS_IO */
#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
!defined(EFI32)
#include <stdarg.h>
#if !defined vsnprintf
#define vsnprintf _vsnprintf
#endif // vsnprintf
/*
* Windows _snprintf and _vsnprintf are not compatible to linux versions.
* Result value is not size of buffer needed, but -1 if no fit is possible.
*
* This fuction tries to 'fix' this by at least suggesting enlarging the
* size by 20.
*/
static int compat_snprintf( char *str, size_t size, const char *format, ... )
{
va_list ap;
int res = -1;
va_start( ap, format );
res = vsnprintf( str, size, format, ap );
va_end( ap );
// No quick fix possible
if( res < 0 )
return( (int) size + 20 );
return( res );
}
#define snprintf compat_snprintf
#endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */
#define ERR_BUF_TOO_SMALL -2
#define SAFE_SNPRINTF() \
{ \
if( ret == -1 ) \
return( -1 ); \
\
if( (unsigned int) ret > n ) { \
p[n - 1] = '\0'; \
return( ERR_BUF_TOO_SMALL ); \
} \
\
n -= (unsigned int) ret; \
p += (unsigned int) ret; \
}
/*
* Return an informational string about the certificate.
*/
@ -642,61 +590,61 @@ int mbedtls_x509_crl_info( char *buf, size_t size, const char *prefix,
ret = mbedtls_snprintf( p, n, "%sCRL version : %d",
prefix, crl->version );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_dn_gets( p, n, &crl->issuer );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n%sthis update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->this_update.year, crl->this_update.mon,
crl->this_update.day, crl->this_update.hour,
crl->this_update.min, crl->this_update.sec );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n%snext update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->next_update.year, crl->next_update.mon,
crl->next_update.day, crl->next_update.hour,
crl->next_update.min, crl->next_update.sec );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
entry = &crl->entry;
ret = mbedtls_snprintf( p, n, "\n%sRevoked certificates:",
prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
while( entry != NULL && entry->raw.len != 0 )
{
ret = mbedtls_snprintf( p, n, "\n%sserial number: ",
prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_serial_gets( p, n, &entry->serial );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, " revocation date: " \
"%04d-%02d-%02d %02d:%02d:%02d",
entry->revocation_date.year, entry->revocation_date.mon,
entry->revocation_date.day, entry->revocation_date.hour,
entry->revocation_date.min, entry->revocation_date.sec );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
entry = entry->next;
}
ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_sig_alg_gets( p, n, &crl->sig_oid, crl->sig_pk, crl->sig_md,
crl->sig_opts );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n" );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
return( (int) ( size - n ) );
}