diff options
Diffstat (limited to 'thirdparty/mbedtls/library/platform_util.c')
| -rw-r--r-- | thirdparty/mbedtls/library/platform_util.c | 166 |
1 files changed, 153 insertions, 13 deletions
diff --git a/thirdparty/mbedtls/library/platform_util.c b/thirdparty/mbedtls/library/platform_util.c index df34167a8f..0741bf575e 100644 --- a/thirdparty/mbedtls/library/platform_util.c +++ b/thirdparty/mbedtls/library/platform_util.c @@ -8,12 +8,18 @@ /* * Ensure gmtime_r is available even with -std=c99; must be defined before - * config.h, which pulls in glibc's features.h. Harmless on other platforms. + * mbedtls_config.h, which pulls in glibc's features.h. Harmless on other platforms + * except OpenBSD, where it stops us accessing explicit_bzero. */ -#if !defined(_POSIX_C_SOURCE) +#if !defined(_POSIX_C_SOURCE) && !defined(__OpenBSD__) #define _POSIX_C_SOURCE 200112L #endif +#if !defined(_GNU_SOURCE) +/* Clang requires this to get support for explicit_bzero */ +#define _GNU_SOURCE +#endif + #include "common.h" #include "mbedtls/platform_util.h" @@ -21,11 +27,40 @@ #include "mbedtls/threading.h" #include <stddef.h> + +#ifndef __STDC_WANT_LIB_EXT1__ +#define __STDC_WANT_LIB_EXT1__ 1 /* Ask for the C11 gmtime_s() and memset_s() if available */ +#endif #include <string.h> +#if defined(_WIN32) +#include <windows.h> +#endif + +// Detect platforms known to support explicit_bzero() +#if defined(__GLIBC__) && (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 25) +#define MBEDTLS_PLATFORM_HAS_EXPLICIT_BZERO 1 +#elif (defined(__FreeBSD__) && (__FreeBSD_version >= 1100037)) || defined(__OpenBSD__) +#define MBEDTLS_PLATFORM_HAS_EXPLICIT_BZERO 1 +#endif + #if !defined(MBEDTLS_PLATFORM_ZEROIZE_ALT) + +#undef HAVE_MEMORY_SANITIZER +#if defined(__has_feature) +#if __has_feature(memory_sanitizer) +#include <sanitizer/msan_interface.h> +#define HAVE_MEMORY_SANITIZER +#endif +#endif + /* - * This implementation should never be optimized out by the compiler + * Where possible, we try to detect the presence of a platform-provided + * secure memset, such as explicit_bzero(), that is safe against being optimized + * out, and use that. + * + * For other platforms, we provide an implementation that aims not to be + * optimized out by the compiler. * * This implementation for mbedtls_platform_zeroize() was inspired from Colin * Percival's blog article at: @@ -40,36 +75,84 @@ * (refer to http://www.daemonology.net/blog/2014-09-05-erratum.html for * details), optimizations of the following form are still possible: * - * if( memset_func != memset ) - * memset_func( buf, 0, len ); + * if (memset_func != memset) + * memset_func(buf, 0, len); * * Note that it is extremely difficult to guarantee that - * mbedtls_platform_zeroize() will not be optimized out by aggressive compilers + * the memset() call will not be optimized out by aggressive compilers * in a portable way. For this reason, Mbed TLS also provides the configuration * option MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure * mbedtls_platform_zeroize() to use a suitable implementation for their * platform and needs. */ +#if !defined(MBEDTLS_PLATFORM_HAS_EXPLICIT_BZERO) && !(defined(__STDC_LIB_EXT1__) && \ + !defined(__IAR_SYSTEMS_ICC__)) \ + && !defined(_WIN32) static void *(*const volatile memset_func)(void *, int, size_t) = memset; +#endif void mbedtls_platform_zeroize(void *buf, size_t len) { - MBEDTLS_INTERNAL_VALIDATE(len == 0 || buf != NULL); - if (len > 0) { +#if defined(MBEDTLS_PLATFORM_HAS_EXPLICIT_BZERO) + explicit_bzero(buf, len); +#if defined(HAVE_MEMORY_SANITIZER) + /* You'd think that Msan would recognize explicit_bzero() as + * equivalent to bzero(), but it actually doesn't on several + * platforms, including Linux (Ubuntu 20.04). + * https://github.com/google/sanitizers/issues/1507 + * https://github.com/openssh/openssh-portable/commit/74433a19bb6f4cef607680fa4d1d7d81ca3826aa + */ + __msan_unpoison(buf, len); +#endif +#elif defined(__STDC_LIB_EXT1__) && !defined(__IAR_SYSTEMS_ICC__) + memset_s(buf, len, 0, len); +#elif defined(_WIN32) + SecureZeroMemory(buf, len); +#else memset_func(buf, 0, len); +#endif + +#if defined(__GNUC__) + /* For clang and recent gcc, pretend that we have some assembly that reads the + * zero'd memory as an additional protection against being optimised away. */ +#if defined(__clang__) || (__GNUC__ >= 10) +#if defined(__clang__) +#pragma clang diagnostic push +#pragma clang diagnostic ignored "-Wvla" +#elif defined(MBEDTLS_COMPILER_IS_GCC) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wvla" +#endif + asm volatile ("" : : "m" (*(char (*)[len]) buf) :); +#if defined(__clang__) +#pragma clang diagnostic pop +#elif defined(MBEDTLS_COMPILER_IS_GCC) +#pragma GCC diagnostic pop +#endif +#endif +#endif } } #endif /* MBEDTLS_PLATFORM_ZEROIZE_ALT */ +void mbedtls_zeroize_and_free(void *buf, size_t len) +{ + if (buf != NULL) { + mbedtls_platform_zeroize(buf, len); + } + + mbedtls_free(buf); +} + #if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT) #include <time.h> #if !defined(_WIN32) && (defined(unix) || \ defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \ - defined(__MACH__)) || defined(__midipix__)) + defined(__MACH__)) || defined__midipix__) #include <unistd.h> #endif /* !_WIN32 && (unix || __unix || __unix__ || - * (__APPLE__ && __MACH__)) || __midipix__ */ + * (__APPLE__ && __MACH__) || __midipix__) */ #if !((defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L) || \ (defined(_POSIX_THREAD_SAFE_FUNCTIONS) && \ @@ -81,9 +164,10 @@ void mbedtls_platform_zeroize(void *buf, size_t len) * threading.h. However, this macro is not part of the Mbed TLS public API, so * we keep it private by only defining it in this file */ -#if !(defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)) +#if !(defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)) || \ + (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)) #define PLATFORM_UTIL_USE_GMTIME -#endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */ +#endif #endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \ ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \ @@ -92,8 +176,13 @@ void mbedtls_platform_zeroize(void *buf, size_t len) struct tm *mbedtls_platform_gmtime_r(const mbedtls_time_t *tt, struct tm *tm_buf) { -#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) +#if defined(_WIN32) && !defined(PLATFORM_UTIL_USE_GMTIME) +#if defined(__STDC_LIB_EXT1__) + return (gmtime_s(tt, tm_buf) == 0) ? NULL : tm_buf; +#else + /* MSVC and mingw64 argument order and return value are inconsistent with the C11 standard */ return (gmtime_s(tm_buf, tt) == 0) ? tm_buf : NULL; +#endif #elif !defined(PLATFORM_UTIL_USE_GMTIME) return gmtime_r(tt, tm_buf); #else @@ -121,3 +210,54 @@ struct tm *mbedtls_platform_gmtime_r(const mbedtls_time_t *tt, #endif /* _WIN32 && !EFIX64 && !EFI32 */ } #endif /* MBEDTLS_HAVE_TIME_DATE && MBEDTLS_PLATFORM_GMTIME_R_ALT */ + +#if defined(MBEDTLS_TEST_HOOKS) +void (*mbedtls_test_hook_test_fail)(const char *, int, const char *); +#endif /* MBEDTLS_TEST_HOOKS */ + +#if defined(MBEDTLS_HAVE_TIME) && !defined(MBEDTLS_PLATFORM_MS_TIME_ALT) + +#include <time.h> +#if !defined(_WIN32) && \ + (defined(unix) || defined(__unix) || defined(__unix__) || \ + (defined(__APPLE__) && defined(__MACH__)) || defined(__HAIKU__) || defined(__midipix__)) +#include <unistd.h> +#endif \ + /* !_WIN32 && (unix || __unix || __unix__ || (__APPLE__ && __MACH__) || __HAIKU__ || __midipix__) */ +#if (defined(_POSIX_VERSION) && _POSIX_VERSION >= 199309L) || defined(__HAIKU__) +mbedtls_ms_time_t mbedtls_ms_time(void) +{ + int ret; + struct timespec tv; + mbedtls_ms_time_t current_ms; + +#if defined(__linux__) && defined(CLOCK_BOOTTIME) || defined(__midipix__) + ret = clock_gettime(CLOCK_BOOTTIME, &tv); +#else + ret = clock_gettime(CLOCK_MONOTONIC, &tv); +#endif + if (ret) { + return time(NULL) * 1000; + } + + current_ms = tv.tv_sec; + + return current_ms*1000 + tv.tv_nsec / 1000000; +} +#elif defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || \ + defined(__MINGW32__) || defined(_WIN64) +#include <windows.h> +mbedtls_ms_time_t mbedtls_ms_time(void) +{ + FILETIME ct; + mbedtls_ms_time_t current_ms; + + GetSystemTimeAsFileTime(&ct); + current_ms = ((mbedtls_ms_time_t) ct.dwLowDateTime + + ((mbedtls_ms_time_t) (ct.dwHighDateTime) << 32LL))/10000; + return current_ms; +} +#else +#error "No mbedtls_ms_time available" +#endif +#endif /* MBEDTLS_HAVE_TIME && !MBEDTLS_PLATFORM_MS_TIME_ALT */ |