library/platform.c (mbedTLS)

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/* * Platform abstraction layer * * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved * 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. * * This file is part of mbed TLS (https://tls.mbed.org) */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #include "mbedtls/platform_util.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(_WIN32) #include <stdarg.h> int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... ) { int ret; va_list argp; /* Avoid calling the invalid parameter handler by checking ourselves */ if( s == NULL || n == 0 || fmt == NULL ) return( -1 ); va_start( argp, fmt ); #if defined(_TRUNCATE) && !defined(__MINGW32__) ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp ); #else ret = _vsnprintf( s, n, fmt, argp ); if( ret < 0 || (size_t) ret == n ) { s[n-1] = '\0'; ret = -1; } #endif 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_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 */