/* * 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 … #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 … #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 … #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 … #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 … #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 … #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 … #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 … #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 … #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 … #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 … #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) { … } /* * Placeholder platform teardown that does nothing by default */ void mbedtls_platform_teardown(mbedtls_platform_context *ctx) { … } #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */ #endif /* MBEDTLS_PLATFORM_C */
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