gbe_fork/mbedtls/platform.c
2023-12-24 14:33:40 +02:00

403 lines
11 KiB
C

/*
* Platform abstraction layer
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#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_SETBUF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_SETBUF)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static void platform_setbuf_uninit(FILE *stream, char *buf)
{
((void) stream);
((void) buf);
}
#define MBEDTLS_PLATFORM_STD_SETBUF platform_setbuf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_SETBUF */
void (*mbedtls_setbuf)(FILE *stream, char *buf) = MBEDTLS_PLATFORM_STD_SETBUF;
int mbedtls_platform_set_setbuf(void (*setbuf_func)(FILE *stream, char *buf))
{
mbedtls_setbuf = setbuf_func;
return 0;
}
#endif /* MBEDTLS_PLATFORM_SETBUF_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;
}
/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
mbedtls_setbuf(file, NULL);
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;
}
/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
mbedtls_setbuf(file, NULL);
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 */