387 lines
11 KiB
C
387 lines
11 KiB
C
/*
|
|
* Platform abstraction layer
|
|
*
|
|
* Copyright The Mbed TLS Contributors
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
#if defined(MBEDTLS_PLATFORM_C)
|
|
|
|
#include "mbedtls/platform.h"
|
|
#include "mbedtls/platform_util.h"
|
|
#include "mbedtls/error.h"
|
|
|
|
/* The compile time configuration of memory allocation via the macros
|
|
* MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO takes precedence over the runtime
|
|
* configuration via mbedtls_platform_set_calloc_free(). So, omit everything
|
|
* related to the latter if MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO are defined. */
|
|
#if defined(MBEDTLS_PLATFORM_MEMORY) && \
|
|
!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) && \
|
|
defined(MBEDTLS_PLATFORM_FREE_MACRO) )
|
|
|
|
#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
|
|
static void *platform_calloc_uninit( size_t n, size_t size )
|
|
{
|
|
((void) n);
|
|
((void) size);
|
|
return( NULL );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
|
|
|
|
#if !defined(MBEDTLS_PLATFORM_STD_FREE)
|
|
static void platform_free_uninit( void *ptr )
|
|
{
|
|
((void) ptr);
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_FREE */
|
|
|
|
static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
|
|
static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
|
|
|
|
void * mbedtls_calloc( size_t nmemb, size_t size )
|
|
{
|
|
return (*mbedtls_calloc_func)( nmemb, size );
|
|
}
|
|
|
|
void mbedtls_free( void * ptr )
|
|
{
|
|
(*mbedtls_free_func)( ptr );
|
|
}
|
|
|
|
int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
|
|
void (*free_func)( void * ) )
|
|
{
|
|
mbedtls_calloc_func = calloc_func;
|
|
mbedtls_free_func = free_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_MEMORY &&
|
|
!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) &&
|
|
defined(MBEDTLS_PLATFORM_FREE_MACRO) ) */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_SNPRINTF)
|
|
#include <stdarg.h>
|
|
int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
va_list argp;
|
|
|
|
va_start( argp, fmt );
|
|
ret = mbedtls_vsnprintf( s, n, fmt, argp );
|
|
va_end( argp );
|
|
|
|
return( ret );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_snprintf_uninit( char * s, size_t n,
|
|
const char * format, ... )
|
|
{
|
|
((void) s);
|
|
((void) n);
|
|
((void) format);
|
|
return( 0 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
|
|
|
|
int (*mbedtls_snprintf)( char * s, size_t n,
|
|
const char * format,
|
|
... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
|
|
|
|
int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
|
|
const char * format,
|
|
... ) )
|
|
{
|
|
mbedtls_snprintf = snprintf_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_VSNPRINTF)
|
|
#include <stdarg.h>
|
|
int mbedtls_platform_win32_vsnprintf( char *s, size_t n, const char *fmt, va_list arg )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/* Avoid calling the invalid parameter handler by checking ourselves */
|
|
if( s == NULL || n == 0 || fmt == NULL )
|
|
return( -1 );
|
|
|
|
#if defined(_TRUNCATE)
|
|
ret = vsnprintf_s( s, n, _TRUNCATE, fmt, arg );
|
|
#else
|
|
ret = vsnprintf( s, n, fmt, arg );
|
|
if( ret < 0 || (size_t) ret == n )
|
|
{
|
|
s[n-1] = '\0';
|
|
ret = -1;
|
|
}
|
|
#endif
|
|
|
|
return( ret );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_PLATFORM_VSNPRINTF_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_VSNPRINTF)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_vsnprintf_uninit( char * s, size_t n,
|
|
const char * format, va_list arg )
|
|
{
|
|
((void) s);
|
|
((void) n);
|
|
((void) format);
|
|
((void) arg);
|
|
return( -1 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_VSNPRINTF platform_vsnprintf_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_VSNPRINTF */
|
|
|
|
int (*mbedtls_vsnprintf)( char * s, size_t n,
|
|
const char * format,
|
|
va_list arg ) = MBEDTLS_PLATFORM_STD_VSNPRINTF;
|
|
|
|
int mbedtls_platform_set_vsnprintf( int (*vsnprintf_func)( char * s, size_t n,
|
|
const char * format,
|
|
va_list arg ) )
|
|
{
|
|
mbedtls_vsnprintf = vsnprintf_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_VSNPRINTF_ALT */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_printf_uninit( const char *format, ... )
|
|
{
|
|
((void) format);
|
|
return( 0 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
|
|
|
|
int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
|
|
|
|
int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
|
|
{
|
|
mbedtls_printf = printf_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
|
|
{
|
|
((void) stream);
|
|
((void) format);
|
|
return( 0 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
|
|
|
|
int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
|
|
MBEDTLS_PLATFORM_STD_FPRINTF;
|
|
|
|
int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
|
|
{
|
|
mbedtls_fprintf = fprintf_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static void platform_exit_uninit( int status )
|
|
{
|
|
((void) status);
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_EXIT */
|
|
|
|
void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
|
|
|
|
int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
|
|
{
|
|
mbedtls_exit = exit_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_EXIT_ALT */
|
|
|
|
#if defined(MBEDTLS_HAVE_TIME)
|
|
|
|
#if defined(MBEDTLS_PLATFORM_TIME_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_TIME)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
|
|
{
|
|
((void) timer);
|
|
return( 0 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_TIME */
|
|
|
|
mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
|
|
|
|
int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
|
|
{
|
|
mbedtls_time = time_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_TIME_ALT */
|
|
|
|
#endif /* MBEDTLS_HAVE_TIME */
|
|
|
|
#if defined(MBEDTLS_ENTROPY_NV_SEED)
|
|
#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
|
|
/* Default implementations for the platform independent seed functions use
|
|
* standard libc file functions to read from and write to a pre-defined filename
|
|
*/
|
|
int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
|
|
{
|
|
FILE *file;
|
|
size_t n;
|
|
|
|
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
|
|
return( -1 );
|
|
|
|
if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
|
|
{
|
|
fclose( file );
|
|
mbedtls_platform_zeroize( buf, buf_len );
|
|
return( -1 );
|
|
}
|
|
|
|
fclose( file );
|
|
return( (int)n );
|
|
}
|
|
|
|
int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
|
|
{
|
|
FILE *file;
|
|
size_t n;
|
|
|
|
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
|
|
return -1;
|
|
|
|
if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
|
|
{
|
|
fclose( file );
|
|
return -1;
|
|
}
|
|
|
|
fclose( file );
|
|
return( (int)n );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
|
|
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
|
|
{
|
|
((void) buf);
|
|
((void) buf_len);
|
|
return( -1 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
|
|
|
|
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
|
|
/*
|
|
* Make dummy function to prevent NULL pointer dereferences
|
|
*/
|
|
static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
|
|
{
|
|
((void) buf);
|
|
((void) buf_len);
|
|
return( -1 );
|
|
}
|
|
|
|
#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
|
|
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
|
|
|
|
int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
|
|
MBEDTLS_PLATFORM_STD_NV_SEED_READ;
|
|
int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
|
|
MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
|
|
|
|
int mbedtls_platform_set_nv_seed(
|
|
int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
|
|
int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
|
|
{
|
|
mbedtls_nv_seed_read = nv_seed_read_func;
|
|
mbedtls_nv_seed_write = nv_seed_write_func;
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
|
|
#endif /* MBEDTLS_ENTROPY_NV_SEED */
|
|
|
|
#if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
|
|
/*
|
|
* Placeholder platform setup that does nothing by default
|
|
*/
|
|
int mbedtls_platform_setup( mbedtls_platform_context *ctx )
|
|
{
|
|
(void)ctx;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Placeholder platform teardown that does nothing by default
|
|
*/
|
|
void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
|
|
{
|
|
(void)ctx;
|
|
}
|
|
#endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
|
|
|
|
#endif /* MBEDTLS_PLATFORM_C */
|