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Rationalize snprintf() usage in X.509 modules

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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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64
library/x509_csr.c
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@ -327,58 +327,6 @@ int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, 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; \
}
#define BEFORE_COLON 14
#define BC "14"
/*
@ -397,19 +345,19 @@ int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
ret = mbedtls_snprintf( p, n, "%sCSR version : %d",
prefix, csr->version );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_dn_gets( p, n, &csr->subject );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
csr->sig_opts );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
mbedtls_pk_get_name( &csr->pk ) ) ) != 0 )
@ -419,7 +367,7 @@ int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
(int) mbedtls_pk_get_bitlen( &csr->pk ) );
SAFE_SNPRINTF();
MBEDTLS_X509_SAFE_SNPRINTF;
return( (int) ( size - n ) );
}