[398] | 1 | /*
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| 2 | * Platform abstraction layer
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| 3 | *
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| 4 | * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 |
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| 22 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 23 | #include "mbedtls/config.h"
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| 24 | #else
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| 25 | #include MBEDTLS_CONFIG_FILE
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| 26 | #endif
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| 27 |
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| 28 | #if defined(MBEDTLS_PLATFORM_C)
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| 29 |
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| 30 | #include "mbedtls/platform.h"
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| 31 | #include "mbedtls/platform_util.h"
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| 32 |
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| 33 | /* The compile time configuration of memory allocation via the macros
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| 34 | * MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO takes precedence over the runtime
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| 35 | * configuration via mbedtls_platform_set_calloc_free(). So, omit everything
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| 36 | * related to the latter if MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO are defined. */
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| 37 | #if defined(MBEDTLS_PLATFORM_MEMORY) && \
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| 38 | !( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) && \
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| 39 | defined(MBEDTLS_PLATFORM_FREE_MACRO) )
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| 40 |
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| 41 | #if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
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| 42 | static void *platform_calloc_uninit( size_t n, size_t size )
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| 43 | {
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| 44 | ((void) n);
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| 45 | ((void) size);
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| 46 | return( NULL );
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| 47 | }
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| 48 |
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| 49 | #define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit
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| 50 | #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
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| 51 |
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| 52 | #if !defined(MBEDTLS_PLATFORM_STD_FREE)
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| 53 | static void platform_free_uninit( void *ptr )
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| 54 | {
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| 55 | ((void) ptr);
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| 56 | }
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| 57 |
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| 58 | #define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit
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| 59 | #endif /* !MBEDTLS_PLATFORM_STD_FREE */
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| 60 |
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| 61 | static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
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| 62 | static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
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| 63 |
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| 64 | void * mbedtls_calloc( size_t nmemb, size_t size )
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| 65 | {
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| 66 | return (*mbedtls_calloc_func)( nmemb, size );
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| 67 | }
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| 68 |
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| 69 | void mbedtls_free( void * ptr )
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| 70 | {
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| 71 | (*mbedtls_free_func)( ptr );
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| 72 | }
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| 73 |
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| 74 | int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
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| 75 | void (*free_func)( void * ) )
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| 76 | {
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| 77 | mbedtls_calloc_func = calloc_func;
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| 78 | mbedtls_free_func = free_func;
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| 79 | return( 0 );
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| 80 | }
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| 81 | #endif /* MBEDTLS_PLATFORM_MEMORY &&
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| 82 | !( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) &&
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| 83 | defined(MBEDTLS_PLATFORM_FREE_MACRO) ) */
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| 84 |
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| 85 | #if defined(_WIN32)
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| 86 | #include <stdarg.h>
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| 87 | int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
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| 88 | {
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| 89 | int ret;
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| 90 | va_list argp;
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| 91 |
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| 92 | /* Avoid calling the invalid parameter handler by checking ourselves */
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| 93 | if( s == NULL || n == 0 || fmt == NULL )
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| 94 | return( -1 );
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| 95 |
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| 96 | va_start( argp, fmt );
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| 97 | #if defined(_TRUNCATE) && !defined(__MINGW32__)
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| 98 | ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
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| 99 | #else
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| 100 | ret = _vsnprintf( s, n, fmt, argp );
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| 101 | if( ret < 0 || (size_t) ret == n )
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| 102 | {
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| 103 | s[n-1] = '\0';
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| 104 | ret = -1;
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| 105 | }
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| 106 | #endif
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| 107 | va_end( argp );
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| 108 |
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| 109 | return( ret );
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| 110 | }
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| 111 | #endif
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| 112 |
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| 113 | #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
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| 114 | #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
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| 115 | /*
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| 116 | * Make dummy function to prevent NULL pointer dereferences
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| 117 | */
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| 118 | static int platform_snprintf_uninit( char * s, size_t n,
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| 119 | const char * format, ... )
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| 120 | {
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| 121 | ((void) s);
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| 122 | ((void) n);
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| 123 | ((void) format);
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| 124 | return( 0 );
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| 125 | }
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| 126 |
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| 127 | #define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit
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| 128 | #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
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| 129 |
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| 130 | int (*mbedtls_snprintf)( char * s, size_t n,
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| 131 | const char * format,
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| 132 | ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
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| 133 |
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| 134 | int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
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| 135 | const char * format,
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| 136 | ... ) )
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| 137 | {
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| 138 | mbedtls_snprintf = snprintf_func;
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| 139 | return( 0 );
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| 140 | }
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| 141 | #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
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| 142 |
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| 143 | #if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
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| 144 | #if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
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| 145 | /*
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| 146 | * Make dummy function to prevent NULL pointer dereferences
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| 147 | */
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| 148 | static int platform_printf_uninit( const char *format, ... )
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| 149 | {
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| 150 | ((void) format);
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| 151 | return( 0 );
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| 152 | }
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| 153 |
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| 154 | #define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit
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| 155 | #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
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| 156 |
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| 157 | int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
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| 158 |
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| 159 | int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
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| 160 | {
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| 161 | mbedtls_printf = printf_func;
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| 162 | return( 0 );
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| 163 | }
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| 164 | #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
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| 165 |
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| 166 | #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
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| 167 | #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
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| 168 | /*
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| 169 | * Make dummy function to prevent NULL pointer dereferences
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| 170 | */
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| 171 | static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
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| 172 | {
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| 173 | ((void) stream);
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| 174 | ((void) format);
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| 175 | return( 0 );
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| 176 | }
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| 177 |
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| 178 | #define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit
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| 179 | #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
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| 180 |
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| 181 | int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
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| 182 | MBEDTLS_PLATFORM_STD_FPRINTF;
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| 183 |
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| 184 | int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
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| 185 | {
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| 186 | mbedtls_fprintf = fprintf_func;
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| 187 | return( 0 );
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| 188 | }
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| 189 | #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
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| 190 |
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| 191 | #if defined(MBEDTLS_PLATFORM_EXIT_ALT)
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| 192 | #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
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| 193 | /*
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| 194 | * Make dummy function to prevent NULL pointer dereferences
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| 195 | */
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| 196 | static void platform_exit_uninit( int status )
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| 197 | {
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| 198 | ((void) status);
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| 199 | }
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| 200 |
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| 201 | #define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit
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| 202 | #endif /* !MBEDTLS_PLATFORM_STD_EXIT */
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| 203 |
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| 204 | void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
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| 205 |
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| 206 | int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
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| 207 | {
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| 208 | mbedtls_exit = exit_func;
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| 209 | return( 0 );
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| 210 | }
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| 211 | #endif /* MBEDTLS_PLATFORM_EXIT_ALT */
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| 212 |
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| 213 | #if defined(MBEDTLS_HAVE_TIME)
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| 214 |
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| 215 | #if defined(MBEDTLS_PLATFORM_TIME_ALT)
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| 216 | #if !defined(MBEDTLS_PLATFORM_STD_TIME)
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| 217 | /*
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| 218 | * Make dummy function to prevent NULL pointer dereferences
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| 219 | */
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| 220 | static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
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| 221 | {
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| 222 | ((void) timer);
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| 223 | return( 0 );
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| 224 | }
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| 225 |
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| 226 | #define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
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| 227 | #endif /* !MBEDTLS_PLATFORM_STD_TIME */
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| 228 |
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| 229 | mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
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| 230 |
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| 231 | int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
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| 232 | {
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| 233 | mbedtls_time = time_func;
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| 234 | return( 0 );
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| 235 | }
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| 236 | #endif /* MBEDTLS_PLATFORM_TIME_ALT */
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| 237 |
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| 238 | #endif /* MBEDTLS_HAVE_TIME */
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| 239 |
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| 240 | #if defined(MBEDTLS_ENTROPY_NV_SEED)
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| 241 | #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
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| 242 | /* Default implementations for the platform independent seed functions use
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| 243 | * standard libc file functions to read from and write to a pre-defined filename
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| 244 | */
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| 245 | int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
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| 246 | {
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| 247 | FILE *file;
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| 248 | size_t n;
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| 249 |
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| 250 | if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
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| 251 | return( -1 );
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| 252 |
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| 253 | if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
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| 254 | {
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| 255 | fclose( file );
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| 256 | mbedtls_platform_zeroize( buf, buf_len );
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| 257 | return( -1 );
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| 258 | }
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| 259 |
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| 260 | fclose( file );
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| 261 | return( (int)n );
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| 262 | }
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| 263 |
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| 264 | int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
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| 265 | {
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| 266 | FILE *file;
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| 267 | size_t n;
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| 268 |
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| 269 | if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
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| 270 | return -1;
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| 271 |
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| 272 | if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
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| 273 | {
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| 274 | fclose( file );
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| 275 | return -1;
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| 276 | }
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| 277 |
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| 278 | fclose( file );
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| 279 | return( (int)n );
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| 280 | }
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| 281 | #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
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| 282 |
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| 283 | #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
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| 284 | #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
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| 285 | /*
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| 286 | * Make dummy function to prevent NULL pointer dereferences
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| 287 | */
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| 288 | static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
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| 289 | {
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| 290 | ((void) buf);
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| 291 | ((void) buf_len);
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| 292 | return( -1 );
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| 293 | }
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| 294 |
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| 295 | #define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
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| 296 | #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
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| 297 |
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| 298 | #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
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| 299 | /*
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| 300 | * Make dummy function to prevent NULL pointer dereferences
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| 301 | */
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| 302 | static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
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| 303 | {
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| 304 | ((void) buf);
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| 305 | ((void) buf_len);
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| 306 | return( -1 );
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| 307 | }
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| 308 |
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| 309 | #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
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| 310 | #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
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| 311 |
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| 312 | int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
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| 313 | MBEDTLS_PLATFORM_STD_NV_SEED_READ;
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| 314 | int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
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| 315 | MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
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| 316 |
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| 317 | int mbedtls_platform_set_nv_seed(
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| 318 | int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
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| 319 | int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
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| 320 | {
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| 321 | mbedtls_nv_seed_read = nv_seed_read_func;
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| 322 | mbedtls_nv_seed_write = nv_seed_write_func;
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| 323 | return( 0 );
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| 324 | }
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| 325 | #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
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| 326 | #endif /* MBEDTLS_ENTROPY_NV_SEED */
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| 327 |
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| 328 | #if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
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| 329 | /*
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| 330 | * Placeholder platform setup that does nothing by default
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| 331 | */
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| 332 | int mbedtls_platform_setup( mbedtls_platform_context *ctx )
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| 333 | {
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| 334 | (void)ctx;
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| 335 |
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| 336 | return( 0 );
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| 337 | }
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| 338 |
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| 339 | /*
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| 340 | * Placeholder platform teardown that does nothing by default
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| 341 | */
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| 342 | void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
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| 343 | {
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| 344 | (void)ctx;
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| 345 | }
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| 346 | #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
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| 347 |
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| 348 | #endif /* MBEDTLS_PLATFORM_C */
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