#!/usr/bin/env python
##
# Copyright (c) 2008 Jelmer Vernooij <jelmer@samba.org>
#
# 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.

"""A sample script showing how to verify a user with username and password."""

import argparse
import getpass
import kerberos
import sys


def main():
    # construct arg parser
    parser = argparse.ArgumentParser(description='Verify Kerberos login.')
    parser.add_argument('--service', default='', help='the service to authenticate as')
    parser.add_argument('--default_realm', default='', help='the realm to use if none is provided in the username')
    parser.add_argument('--verify', default=False, action='store_true', help='enable KDC verification support')
    parser.add_argument('user', metavar='user', help='the username to verify')
    args = parser.parse_args()

    print args.service

    # get the password
    password = getpass.getpass('Password: ')

    # verify
    try:
        kerberos.checkPassword(args.user, password, args.service, args.default_realm, args.verify)
        print "Successfully verified"
    except kerberos.BasicAuthError as e:
        print "{0} ({1})".format(*e.args)

if __name__ == "__main__":
    main()