forked from KolibriOS/kolibrios
Rustem Gimadutdinov (rgimad)
748c187814
nothing new since january just upload so all devs can participate. git-svn-id: svn://kolibrios.org@8774 a494cfbc-eb01-0410-851d-a64ba20cac60
142 lines
5.1 KiB
C
142 lines
5.1 KiB
C
/*
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* Common and shared functions used by multiple modules in the Mbed TLS
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* library.
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*
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* Copyright (C) 2018, Arm Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* This file is part of Mbed TLS (https://tls.mbed.org)
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*/
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/*
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* Ensure gmtime_r is available even with -std=c99; must be defined before
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* config.h, which pulls in glibc's features.h. Harmless on other platforms.
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*/
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#if !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 200112L
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#endif
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include "mbedtls/platform_util.h"
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#include "mbedtls/platform.h"
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#include "mbedtls/threading.h"
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#include <stddef.h>
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#include <string.h>
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#if !defined(MBEDTLS_PLATFORM_ZEROIZE_ALT)
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/*
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* This implementation should never be optimized out by the compiler
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*
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* This implementation for mbedtls_platform_zeroize() was inspired from Colin
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* Percival's blog article at:
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*
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* http://www.daemonology.net/blog/2014-09-04-how-to-zero-a-buffer.html
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*
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* It uses a volatile function pointer to the standard memset(). Because the
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* pointer is volatile the compiler expects it to change at
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* any time and will not optimize out the call that could potentially perform
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* other operations on the input buffer instead of just setting it to 0.
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* Nevertheless, as pointed out by davidtgoldblatt on Hacker News
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* (refer to http://www.daemonology.net/blog/2014-09-05-erratum.html for
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* details), optimizations of the following form are still possible:
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*
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* if( memset_func != memset )
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* memset_func( buf, 0, len );
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*
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* Note that it is extremely difficult to guarantee that
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* mbedtls_platform_zeroize() will not be optimized out by aggressive compilers
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* in a portable way. For this reason, Mbed TLS also provides the configuration
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* option MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
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* mbedtls_platform_zeroize() to use a suitable implementation for their
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* platform and needs.
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*/
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static void * (* const volatile memset_func)( void *, int, size_t ) = memset;
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void mbedtls_platform_zeroize( void *buf, size_t len )
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{
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MBEDTLS_INTERNAL_VALIDATE( len == 0 || buf != NULL );
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if( len > 0 )
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memset_func( buf, 0, len );
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}
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#endif /* MBEDTLS_PLATFORM_ZEROIZE_ALT */
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#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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#include <time.h>
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#if !defined(_WIN32) && (defined(unix) || \
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defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
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defined(__MACH__)))
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#include <unistd.h>
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#endif /* !_WIN32 && (unix || __unix || __unix__ ||
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* (__APPLE__ && __MACH__)) */
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#if !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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_POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) )
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/*
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* This is a convenience shorthand macro to avoid checking the long
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* preprocessor conditions above. Ideally, we could expose this macro in
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* platform_util.h and simply use it in platform_util.c, threading.c and
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* threading.h. However, this macro is not part of the Mbed TLS public API, so
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* we keep it private by only defining it in this file
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*/
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#if ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) )
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#define PLATFORM_UTIL_USE_GMTIME
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#endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */
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#endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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_POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) ) */
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struct tm *mbedtls_platform_gmtime_r( const mbedtls_time_t *tt,
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struct tm *tm_buf )
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{
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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return( ( gmtime_s( tm_buf, tt ) == 0 ) ? tm_buf : NULL );
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#elif !defined(PLATFORM_UTIL_USE_GMTIME)
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return( gmtime_r( tt, tm_buf ) );
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#else
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struct tm *lt;
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#if defined(MBEDTLS_THREADING_C)
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if( mbedtls_mutex_lock( &mbedtls_threading_gmtime_mutex ) != 0 )
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return( NULL );
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#endif /* MBEDTLS_THREADING_C */
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lt = gmtime( tt );
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if( lt != NULL )
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{
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memcpy( tm_buf, lt, sizeof( struct tm ) );
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}
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#if defined(MBEDTLS_THREADING_C)
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if( mbedtls_mutex_unlock( &mbedtls_threading_gmtime_mutex ) != 0 )
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return( NULL );
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#endif /* MBEDTLS_THREADING_C */
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return( ( lt == NULL ) ? NULL : tm_buf );
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#endif /* _WIN32 && !EFIX64 && !EFI32 */
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}
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#endif /* MBEDTLS_HAVE_TIME_DATE && MBEDTLS_PLATFORM_GMTIME_R_ALT */
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