d76a26e086
Keep applying the windows entropy patch (UWP support).
Remove no longer needed padlock patch.
Update thirdparty README to reflect changes, and new source inclusion
criteria.
(cherry picked from commit e375cbd094)
133 lines
4.8 KiB
C
133 lines
4.8 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 The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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#include "common.h"
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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 >= 200112L ) )
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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 >= 200112L ) ) */
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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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