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/*
File: file_xml.c
Copyright (C) 2016 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_xml)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_xml(file_stat_t *file_stat);
const file_hint_t file_hint_xml = {
.extension = "xml",
.description = "Symantec encrypted xml files",
.max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_xml
};
/*@
@ requires valid_file_rename_param(file_recovery);
@ requires \valid_read(title + (0 .. size-1));
@ requires \initialized(title + (0 .. size-1));
@ ensures valid_file_rename_result(file_recovery);
@*/
static void file_rename_xml_aux(file_recovery_t *file_recovery, const char *title, const unsigned int size)
{
unsigned int j;
if(size < 2)
return;
/*@
@ loop invariant j <= size;
@ loop assigns j;
@ loop variant size - 1 - j;
@*/
for(j = 0; j < size-1; j += 2)
{
if((title[j] == 0 && title[j + 1] == 0) || (title[j] == '<' && title[j + 1] == 0))
{
file_rename_unicode(file_recovery, title, j, 0, NULL, 1);
return ;
}
}
file_rename_unicode(file_recovery, title, size, 0, NULL, 1);
}
/*@
@ requires file_recovery->file_rename==&file_rename_xml;
@ requires valid_file_rename_param(file_recovery);
@ ensures valid_file_rename_result(file_recovery);
@*/
static void file_rename_xml(file_recovery_t *file_recovery)
{
static const char fn[] = "<\0f\0i\0l\0e\0n\0a\0m\0e\0>\0";
FILE *file;
char buffer[4096];
size_t lu;
unsigned int i;
if((file = fopen(file_recovery->filename, "rb")) == NULL)
return;
if((lu = fread(&buffer, 1, sizeof(buffer) - 2, file)) <= 0)
{
fclose(file);
return;
}
fclose(file);
if(lu <= 20)
return ;
/*@ assert 20 <= lu <= sizeof(buffer)-2; */
/*@ assert \valid(buffer + (0 .. lu+1)); */
buffer[lu] = '\0';
buffer[lu + 1] = '\0';
/*@
@ loop invariant 0 <= i <= lu - 20 + 1;
@ loop assigns i;
@ loop variant lu - 20 - i;
@*/
for(i = 0; i < lu - 20 && !(buffer[i] == 0 && buffer[i + 1] == 0); i += 2)
{
if(memcmp(&buffer[i], fn, 20) == 0)
{
/*@ assert \valid_read(buffer + (0 .. lu+1)); */
/*@ assert \valid_read(buffer + (20 + i.. lu+1)); */
file_rename_xml_aux(file_recovery, &buffer[i+20], lu + 1 - 20 - i );
return;
}
}
}
/*@
@ requires separation: \separated(&file_hint_xml, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_xml(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_xml.extension;
file_recovery_new->min_filesize = 512;
file_recovery_new->file_rename = &file_rename_xml;
return 1;
}
static void register_header_check_xml(file_stat_t *file_stat)
{
static const unsigned char xml_header[142] = {
0x3c, 0x00, 0x3f, 0x00, 'x', 0x00, 'm', 0x00,
'l', 0x00, ' ', 0x00, 'v', 0x00, 'e', 0x00,
'r', 0x00, 's', 0x00, 'i', 0x00, 'o', 0x00,
'n', 0x00, 0x3d, 0x00, 0x22, 0x00, '1', 0x00,
'.', 0x00, '0', 0x00, 0x22, 0x00, ' ', 0x00,
'e', 0x00, 'n', 0x00, 'c', 0x00, 'o', 0x00,
'd', 0x00, 'i', 0x00, 'n', 0x00, 'g', 0x00,
0x3d, 0x00, 0x22, 0x00, 'U', 0x00, 'T', 0x00,
'F', 0x00, 0x2d, 0x00, '1', 0x00, '6', 0x00,
0x22, 0x00, 0x3f, 0x00, 0x3e, 0x00, 0x3c, 0x00,
0x21, 0x00, 0x2d, 0x00, 0x2d, 0x00, 'G', 0x00,
'E', 0x00, 'T', 0x00, 'R', 0x00, 'S', 0x00,
'F', 0x00, 'i', 0x00, 'l', 0x00, 'e', 0x00,
'H', 0x00, 'e', 0x00, 'a', 0x00, 'd', 0x00,
'e', 0x00, 'r', 0x00, 'S', 0x00, 'i', 0x00,
'z', 0x00, 'e', 0x00, 0x3d, 0x00, '0', 0x00,
'x', 0x00, '0', 0x00, '0', 0x00, '0', 0x00,
'0', 0x00, '0', 0x00, '8', 0x00
};
register_header_check(0, xml_header, sizeof(xml_header), &header_check_xml, file_stat);
}
#endif
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