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#! /usr/bin/python -E
# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program 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; version 2 only
#
# 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 to the Free Software
# Foundation, Inc., 59 Tempal Place, Suite 330, Boston, MA 02111-1307 USA
#

import sys
from optparse import OptionParser
import ipa
import ipa.ipaclient as ipaclient
import ipa.config

import xmlrpclib
import kerberos
import krbV
import ldap
import getpass

def usage():
    print "ipa-passwd [user]"
    sys.exit(1)

def parse_options():
    parser = OptionParser()
    parser.add_option("--usage", action="store_true",
                      help="Program usage")

    args = ipa.config.init_config(sys.argv)
    options, args = parser.parse_args(args)

    return options, args

def get_principal(krbctx):
    try:
        ccache = krbctx.default_ccache()
        cprinc = ccache.principal()
    except krbV.Krb5Error, e:
        #TODO: do a kinit
        print "Unable to get kerberos principal: %s" % e[1]
        return None
        
    return cprinc.name

def main():
    match = False
    username = None
    principal = None

    krbctx = krbV.default_context()
    options, args = parse_options()

    if len(args) == 2:
        username = args[1]
    else:
        principal = get_principal(krbctx)
        if principal is None:
            return 1

    if not principal:
        u = username.split('@')
        if len(u) > 2 or len(u) == 0:
            print "Invalid user name (%s)" % username
        if len(u) == 1:
            principal = username+"@"+krbctx.default_realm
        else:
            principal = username

    print "Changing password for %s" % principal

    while (match != True):
        # No syntax checking of the password is required because that is done
        # on the server side
        password = getpass.getpass("  New Password: ")
        confirm = getpass.getpass("  Confirm Password: ")
        if (password != confirm):
            print "Passwords do not match"
            match = False
        elif (len(password) < 1):
            print "Password cannot be empty"
            match = False
        else:
            match = True

    try:
        client = ipaclient.IPAClient()
        client.modifyPassword(principal, None, password)
    except ipa.ipaerror.IPAError, e:
        print "%s" % (e.message)
        return 1

    return 0

if __name__ == "__main__":
    sys.exit(main())