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/*
File: file_pfx.c
Copyright (C) 2008 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_pfx)
#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"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_pfx(file_stat_t *file_stat);
const file_hint_t file_hint_pfx= {
.extension="pfx",
.description="PKCS#12 keys",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_pfx
};
/* A pfx file are PKCS#12 data encoded following ASN.1 DER
*
* PKCS #12: Personal Information Exchange Syntax Standard
* ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1.pdf
*
* For the recovery PhotoRec assumes
* - the file is smaller than 65535+4 bytes
* - PKCS #7 ContentInfo contentType=data
*
* 0:d=0 hl=4 l=XXXX cons: SEQUENCE
* 30 82 XX XX XXXX + 4 = filesize
* 4:d=1 hl=2 l= 1 prim: INTEGER
* 02 01 03 version 3
* 7:d=1 hl=4 l=XXXX cons: SEQUENCE
* 30 82 XX XX
* 11:d=2 hl=2 l= 9 prim: OBJECT :pkcs7-data
* 06 09 2a 86 48 86 f7 0d 01 07 01
* A PKCS #7 ContentInfo, whose contentType is signedData in
* public-key integrity mode and data in password integrity mode.
* Here, contentType=data
*/
/*@
@ requires buffer_size >= 9;
@ requires separation: \separated(&file_hint_pfx, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_pfx(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)
{
if(buffer[0]==0x30 && buffer[1]==0x82 &&
buffer[4]==0x02 && buffer[5]==0x01 && buffer[6]==0x03 &&
buffer[7]==0x30 && buffer[8]==0x82)
{
const uint64_t size=((buffer[2])<<8) + buffer[3] + 4;
if(size < 11 + 11)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_pfx.extension;
file_recovery_new->calculated_file_size=size;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;
}
return 0;
}
static void register_header_check_pfx(file_stat_t *file_stat)
{
static const unsigned char pfx_header[11]= {
0x06, 0x09,
0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x01
};
register_header_check(11, pfx_header,sizeof(pfx_header), &header_check_pfx, file_stat);
}
#endif
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