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Implement PSA ITS over files

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Implement the PSA ITS API over stdio files.
This commit is contained in:
Gilles Peskine 2018-11-16 22:24:15 +01:00
parent 601bd53b80
commit 6194dc2062
8 changed files with 264 additions and 0 deletions
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5
include/mbedtls/check_config.h
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@ -547,6 +547,11 @@
#error "MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_PSA_ITS_FILE_C) && \
!defined(MBEDTLS_FS_IO)
#error "MBEDTLS_PSA_ITS_FILE_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_RSA_C) && ( !defined(MBEDTLS_BIGNUM_C) || \
!defined(MBEDTLS_OID_C) )
#error "MBEDTLS_RSA_C defined, but not all prerequisites"

12
include/mbedtls/config.h
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@ -2794,6 +2794,18 @@
*/
//#define MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
/**
* \def MBEDTLS_PSA_ITS_FILE_C
*
* Enable the emulation of the Platform Security Architecture
* Internal Trusted Storage (PSA ITS) over files.
*
* Module: library/psa_its_file.c
*
* Requires: MBEDTLS_FS_IO
*/
#define MBEDTLS_PSA_ITS_FILE_C
/**
* \def MBEDTLS_RIPEMD160_C
*

1
library/CMakeLists.txt
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@ -58,6 +58,7 @@ set(src_crypto
psa_crypto_storage.c
psa_crypto_storage_file.c
psa_crypto_storage_its.c
psa_its_file.c
ripemd160.c
rsa.c
rsa_internal.c

1
library/Makefile
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@ -87,6 +87,7 @@ OBJS_CRYPTO= aes.o aesni.o arc4.o \
psa_crypto_storage.o \
psa_crypto_storage_file.o \
psa_crypto_storage_its.o \
psa_its_file.o \
ripemd160.o rsa_internal.o rsa.o \
sha1.o sha256.o sha512.o \
threading.o timing.o version.o \

233
library/psa_its_file.c Normal file
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@ -0,0 +1,233 @@
/*
* PSA ITS simulator over stdio files.
*/
/* Copyright (C) 2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if defined(MBEDTLS_CONFIG_FILE)
#include MBEDTLS_CONFIG_FILE
#else
#include "mbedtls/config.h"
#endif
#if defined(MBEDTLS_PSA_ITS_FILE_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#define mbedtls_snprintf snprintf
#endif
#include "psa_crypto_its.h"
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define PSA_ITS_STORAGE_PREFIX ""
#define PSA_ITS_STORAGE_FILENAME_PATTERN "%08lx%08lx"
#define PSA_ITS_STORAGE_SUFFIX ".psa_its"
#define PSA_ITS_STORAGE_FILENAME_LENGTH \
( sizeof( PSA_ITS_STORAGE_PREFIX ) - 1 + /*prefix without terminating 0*/ \
16 + /*UID (64-bit number in hex)*/ \
sizeof( PSA_ITS_STORAGE_SUFFIX ) - 1 + /*suffix without terminating 0*/ \
1 /*terminating null byte*/ )
#define PSA_ITS_STORAGE_TEMP \
PSA_ITS_STORAGE_PREFIX "tempfile" PSA_ITS_STORAGE_SUFFIX
/* The maximum value of psa_storage_info_t.size */
#define PSA_ITS_MAX_SIZE 0xffffffff
#define PSA_ITS_MAGIC_STRING "PSA\0ITS\0"
#define PSA_ITS_MAGIC_LENGTH 8
typedef struct
{
uint8_t magic[PSA_ITS_MAGIC_LENGTH];
uint8_t size[sizeof( uint32_t )];
uint8_t flags[sizeof( psa_storage_create_flags_t )];
} psa_its_file_header_t;
static void psa_its_fill_filename( psa_storage_uid_t uid, char *filename )
{
/* Break up the UID into two 32-bit pieces so as not to rely on
* long long support in snprintf. */
mbedtls_snprintf( filename, PSA_ITS_STORAGE_FILENAME_LENGTH,
"%s" PSA_ITS_STORAGE_FILENAME_PATTERN "%s",
PSA_ITS_STORAGE_PREFIX,
(unsigned long) ( uid >> 32 ),
(unsigned long) ( uid & 0xffffffff ),
PSA_ITS_STORAGE_SUFFIX );
}
static psa_status_t psa_its_read_file( psa_storage_uid_t uid,
struct psa_storage_info_t *p_info,
FILE **p_stream )
{
char filename[PSA_ITS_STORAGE_FILENAME_LENGTH];
psa_its_file_header_t header;
size_t n;
*p_stream = NULL;
psa_its_fill_filename( uid, filename );
*p_stream = fopen( filename, "rb" );
if( *p_stream == NULL )
return( PSA_ERROR_DOES_NOT_EXIST );
n = fread( &header, 1, sizeof( header ), *p_stream );
if( n != sizeof( header ) )
return( PSA_ERROR_DATA_CORRUPT );
if( memcmp( header.magic, PSA_ITS_MAGIC_STRING,
PSA_ITS_MAGIC_LENGTH ) != 0 )
return( PSA_ERROR_DATA_CORRUPT );
p_info->size = ( header.size[0] |
header.size[1] << 8 |
header.size[2] << 16 |
header.size[3] << 24 );
p_info->flags = ( header.flags[0] |
header.flags[1] << 8 |
header.flags[2] << 16 |
header.flags[3] << 24 );
return( PSA_SUCCESS );
}
psa_status_t psa_its_get_info( psa_storage_uid_t uid,
struct psa_storage_info_t *p_info )
{
psa_status_t status;
FILE *stream = NULL;
status = psa_its_read_file( uid, p_info, &stream );
if( stream != NULL )
fclose( stream );
return( status );
}
psa_status_t psa_its_get( psa_storage_uid_t uid,
uint32_t data_offset,
uint32_t data_length,
void *p_data )
{
psa_status_t status;
FILE *stream = NULL;
size_t n;
struct psa_storage_info_t info;
status = psa_its_read_file( uid, &info, &stream );
if( status != PSA_SUCCESS )
goto exit;
status = PSA_ERROR_DATA_CORRUPT;
if( data_offset + data_length < data_offset )
goto exit;
#if SIZE_MAX < 0xffffffff
if( data_offset + data_length > SIZE_MAX )
goto exit;
#endif
if( data_offset + data_length > info.size )
goto exit;
status = PSA_ERROR_DATA_CORRUPT;
#if LONG_MAX < 0xffffffff
while( data_offset > LONG_MAX )
{
if( fseek( stream, LONG_MAX, SEEK_CUR ) != 0 )
goto exit;
data_offset -= LONG_MAX;
}
#endif
if( fseek( stream, data_offset, SEEK_CUR ) != 0 )
goto exit;
n = fread( p_data, 1, data_length, stream );
if( n != data_length )
goto exit;
status = PSA_SUCCESS;
exit:
if( stream != NULL )
fclose( stream );
return( status );
}
psa_status_t psa_its_set( psa_storage_uid_t uid,
uint32_t data_length,
const void *p_data,
psa_storage_create_flags_t create_flags )
{
psa_status_t status = PSA_ERROR_STORAGE_FAILURE;
char filename[PSA_ITS_STORAGE_FILENAME_LENGTH];
FILE *stream = NULL;
psa_its_file_header_t header;
size_t n;
memcpy( header.magic, PSA_ITS_MAGIC_STRING, PSA_ITS_MAGIC_LENGTH );
header.size[0] = data_length & 0xff;
header.size[1] = ( data_length >> 8 ) & 0xff;
header.size[2] = ( data_length >> 16 ) & 0xff;
header.size[3] = ( data_length >> 24 ) & 0xff;
header.flags[0] = create_flags & 0xff;
header.flags[1] = ( create_flags >> 8 ) & 0xff;
header.flags[2] = ( create_flags >> 16 ) & 0xff;
header.flags[3] = ( create_flags >> 24 ) & 0xff;
psa_its_fill_filename( uid, filename );
stream = fopen( PSA_ITS_STORAGE_TEMP, "wb" );
if( stream == NULL )
goto exit;
status = PSA_ERROR_INSUFFICIENT_STORAGE;
n = fwrite( &header, 1, sizeof( header ), stream );
if( n != sizeof( header ) )
goto exit;
n = fwrite( p_data, 1, data_length, stream );
if( n != data_length )
goto exit;
status = PSA_SUCCESS;
exit:
if( stream != NULL )
{
int ret = fclose( stream );
if( status == PSA_SUCCESS && ret != 0 )
status = PSA_ERROR_INSUFFICIENT_STORAGE;
}
if( status == PSA_SUCCESS )
{
if( rename( PSA_ITS_STORAGE_TEMP, filename ) != 0 )
status = PSA_ERROR_STORAGE_FAILURE;
}
remove( PSA_ITS_STORAGE_TEMP );
return( status );
}
psa_status_t psa_its_remove( psa_storage_uid_t uid )
{
char filename[PSA_ITS_STORAGE_FILENAME_LENGTH];
FILE *stream;
psa_its_fill_filename( uid, filename );
stream = fopen( filename, "rb" );
if( stream == NULL )
return( PSA_ERROR_DOES_NOT_EXIST );
fclose( stream );
if( remove( filename ) != 0 )
return( PSA_ERROR_STORAGE_FAILURE );
return( PSA_SUCCESS );
}
#endif /* MBEDTLS_PSA_ITS_FILE_C */

3
library/version_features.c
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@ -720,6 +720,9 @@ static const char *features[] = {
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C)
"MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C",
#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C */
#if defined(MBEDTLS_PSA_ITS_FILE_C)
"MBEDTLS_PSA_ITS_FILE_C",
#endif /* MBEDTLS_PSA_ITS_FILE_C */
#if defined(MBEDTLS_RIPEMD160_C)
"MBEDTLS_RIPEMD160_C",
#endif /* MBEDTLS_RIPEMD160_C */

8
programs/test/query_config.c
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@ -1962,6 +1962,14 @@ int query_config( const char *config )
}
#endif /* MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C */
#if defined(MBEDTLS_PSA_ITS_FILE_C)
if( strcmp( "MBEDTLS_PSA_ITS_FILE_C", config ) == 0 )
{
MACRO_EXPANSION_TO_STR( MBEDTLS_PSA_ITS_FILE_C );
return( 0 );
}
#endif /* MBEDTLS_PSA_ITS_FILE_C */
#if defined(MBEDTLS_RIPEMD160_C)
if( strcmp( "MBEDTLS_RIPEMD160_C", config ) == 0 )
{

1
visualc/VS2010/mbedTLS.vcxproj
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@ -304,6 +304,7 @@
<ClCompile Include="..\..\library\psa_crypto_storage.c" />
<ClCompile Include="..\..\library\psa_crypto_storage_file.c" />
<ClCompile Include="..\..\library\psa_crypto_storage_its.c" />
<ClCompile Include="..\..\library\psa_its_file.c" />
<ClCompile Include="..\..\library\ripemd160.c" />
<ClCompile Include="..\..\library\rsa.c" />
<ClCompile Include="..\..\library\rsa_internal.c" />