diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/psa_its_file.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/psa_its_file.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/library/psa_its_file.c b/lib/mbedtls-2.27.0/library/psa_its_file.c new file mode 100644 index 0000000..7798da6 --- /dev/null +++ b/lib/mbedtls-2.27.0/library/psa_its_file.c @@ -0,0 +1,259 @@ +/* + * PSA ITS simulator over stdio files. + */ +/* + * Copyright The Mbed TLS Contributors + * 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. + */ + +#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 + +#if defined(_WIN32) +#include <windows.h> +#endif + +#include "psa_crypto_its.h" + +#include <limits.h> +#include <stdint.h> +#include <stdio.h> +#include <string.h> + +#if !defined(PSA_ITS_STORAGE_PREFIX) +#define PSA_ITS_STORAGE_PREFIX "" +#endif + +#define PSA_ITS_STORAGE_FILENAME_PATTERN "%08x%08x" +#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 + +/* As rename fails on Windows if the new filepath already exists, + * use MoveFileExA with the MOVEFILE_REPLACE_EXISTING flag instead. + * Returns 0 on success, nonzero on failure. */ +#if defined(_WIN32) +#define rename_replace_existing( oldpath, newpath ) \ + ( ! MoveFileExA( oldpath, newpath, MOVEFILE_REPLACE_EXISTING ) ) +#else +#define rename_replace_existing( oldpath, newpath ) rename( oldpath, newpath ) +#endif + +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) ( uid >> 32 ), + (unsigned) ( 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, + size_t *p_data_length ) +{ + 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_INVALID_ARGUMENT; + 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_STORAGE_FAILURE; +#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; + if( p_data_length != NULL ) + *p_data_length = n; + +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; + if( data_length != 0 ) + { + 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_replace_existing( PSA_ITS_STORAGE_TEMP, filename ) != 0 ) + status = PSA_ERROR_STORAGE_FAILURE; + } + /* The temporary file may still exist, but only in failure cases where + * we're already reporting an error. So there's nothing we can do on + * failure. If the function succeeded, and in some error cases, the + * temporary file doesn't exist and so remove() is expected to fail. + * Thus we just ignore the return status of remove(). */ + (void) 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 */ |