77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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File: file_luks.c
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Copyright (C) 2014 Christophe GRENIER <grenier@cgsecurity.org>
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This software 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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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_luks)
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#include "types.h"
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#include "filegen.h"
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#include "common.h"
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#include "luks_struct.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_luks(file_stat_t *file_stat);
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const file_hint_t file_hint_luks= {
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.extension="luks",
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.description="LUKS encrypted file",
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_luks
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};
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/*@
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@ requires buffer_size >= sizeof(struct luks_phdr);
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@ requires separation: \separated(&file_hint_luks, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_luks(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)
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{
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const struct luks_phdr *hdr=(const struct luks_phdr *)buffer;
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const unsigned int version=be16(hdr->version);
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if(version<1 || version>2)
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return 0;
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if(!isalpha(hdr->cipherName[0]))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_luks.extension;
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file_recovery_new->min_filesize=512;
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return 1;
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}
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static void register_header_check_luks(file_stat_t *file_stat)
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{
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static const unsigned char luks_header[6]= {
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'L' , 'U' , 'K' , 'S' , 0xba, 0xbe
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};
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register_header_check(0, luks_header, sizeof(luks_header), &header_check_luks, file_stat);
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}
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#endif
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