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#!/usr/bin/env python
# coding: utf-8
# pskc2csv.py - script to convert a PSKC file to CSV
#
# Copyright (C) 2014 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
import argparse
import csv
import operator
import sys
import getpass
from binascii import b2a_hex
import pskc
from pskc.exceptions import DecryptionError
version_string = '''
pskc2csv (python-pskc) %s
Written by Arthur de Jong.
Copyright (C) 2014 Arthur de Jong
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
'''.strip() % pskc.__version__
class VersionAction(argparse.Action):
def __init__(self, option_strings, dest,
help='output version information and exit'):
super(VersionAction, self).__init__(
option_strings=option_strings,
dest=argparse.SUPPRESS,
default=argparse.SUPPRESS,
nargs=0,
help=help)
def __call__(self, parser, namespace, values, option_string=None):
print version_string
parser.exit()
epilog = '''
supported columns:
id, serial, secret, counter, time_offset, time_interval, interval,
time_drift, issuer, manufacturer, response_length, algorithm
And any other properties of pskc.key.Key instances.
Report bugs to <python-pskc-users@lists.arthurdejong.org>.
'''.strip()
# set up command line parser
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description='Convert a PSKC file to CSV.', epilog=epilog)
parser.add_argument(
'input', metavar='FILE', help='the PSKC file to read')
parser.add_argument(
'-V', '--version', action=VersionAction)
parser.add_argument(
'-o', '--output', metavar='FILE',
help='write CSV to file instead of stdout')
parser.add_argument(
'-c', '--columns', metavar='COL,COL', type=lambda x: x.split(','),
help='list of columns to export',
default='serial,secret,algorithm,response_length,time_interval')
def password_prompt(pskcfile):
"""Prompt for a password and use the password to decrypt."""
prompt = 'Password: '
if pskcfile.encryption.key_name:
prompt = '%s: ' % pskcfile.encryption.key_name
passwd = getpass.getpass(prompt)
pskcfile.encryption.derive_key(passwd)
def get_column(key, column):
"""Return a string value for the given column."""
value = operator.attrgetter(column)(key)
if column == 'secret':
return b2a_hex(value)
return value
def is_encrypted(pskcfile):
"""Check whether the PSKC file is encrypted."""
try:
pskcfile.keys[0].secret
except DecryptionError:
return True
except IndexError:
pass
return False
if __name__ == '__main__':
# parse command-line arguments
args = parser.parse_args()
# open and parse input PSKC file
pskcfile = pskc.PSKC(args.input)
# see if we should prompt for a password
if sys.stdin.isatty() and is_encrypted(pskcfile):
password_prompt(pskcfile)
# open output CSV file, write header and keys
with open(args.output, 'wb') if args.output else sys.stdout as output:
csvfile = csv.writer(output, quoting=csv.QUOTE_MINIMAL)
csvfile.writerow(args.columns)
for key in pskcfile.keys:
csvfile.writerow([
get_column(key, column) for column in args.columns])
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