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#! /usr/bin/python -E
# Authors: Simo Sorce <ssorce@redhat.com>
#          Karl MacMillan <kmacmillan@mentalrootkit.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 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

VERSION = "%prog .1"

import sys
sys.path.append("/usr/share/ipa")

import krbV
import socket
import logging
from optparse import OptionParser
import ipaclient.ipadiscovery
import ipaclient.ipachangeconf
import ipaclient.ntpconf
from ipa.ipautil import run

def parse_options():
    parser = OptionParser(version=VERSION)
    parser.add_option("--domain", dest="domain", help="domain name")
    parser.add_option("--server", dest="server", help="IPA server")
    parser.add_option("--realm", dest="realm_name", help="realm name")
    parser.add_option("-f", "--force", dest="force", action="store_true",
                      default=False, help="force setting of ldap/kerberos conf")
    parser.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="print debugging information")
    parser.add_option("-U", "--unattended", dest="unattended",
                      help="unattended installation never prompts the user")
    parser.add_option("-N", "--no-ntp", action="store_false",
                      help="do not configure ntp", default=True, dest="conf_ntp")

    options, args = parser.parse_args()

    return options

def ask_for_confirmation(message):
    yesno = raw_input(message + " [y/N]: ")
    if not yesno or yesno.lower()[0] != "y":
        return False
    print "\n"
    return True

def logging_setup(options):
    # Always log everything (i.e., DEBUG) to the log
    # file.
    logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)s %(levelname)s %(message)s',
                        filename='ipaclient-install.log',
                        filemode='w')

    console = logging.StreamHandler()
    # If the debug option is set, also log debug messages to the console
    if options.debug:
        console.setLevel(logging.DEBUG)
    else:
        # Otherwise, log critical and error messages
        console.setLevel(logging.ERROR)
    formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
    console.setFormatter(formatter)
    logging.getLogger('').addHandler(console)

def main():
    options = parse_options()
    logging_setup(options)
    dnsok = True

    # Create the discovery instance
    ds = ipaclient.ipadiscovery.IPADiscovery()

    ret = ds.search()
    if ret == -10:
        print "Can't get the fully qualified name of this host"
        print "Please check that the client is properly configured"
        return ret
    if ret == -1:
        logging.debug("Domain not found")
        if options.domain:
            dom = options.domain
        elif options.unattended:
            return ret
        else:
            print "Failed to determine your DNS domain (DNS misconfigured?)"
            dom = raw_input("Please provide your domain name (ex: example.com): ")
        ret = ds.search(domain=dom)
    if ret == -2:
        dnsok = False
        logging.debug("IPA Server not found")
        if options.server:
            srv = options.server
        elif options.unattended:
            return ret
        else:
            print "Failed to find the IPA Server (DNS misconfigured?)"
            srv = raw_input("Please provide your server name (ex: ipa.example.com): ")
        ret = ds.search(domain=dom, server=srv)
    if ret != 0:
        print "Failed to verify that "+srv+" is an IPA Server, aborting!"
        return ret

    if dnsok:
        print "Discovery was successful!"
    elif not options.unattended:
        print "\nThe failure to use DNS to find your IPA server indicates that your resolv.conf file is not properly configured\n."
        print "Autodiscovery of servers for failover cannot work with this configuration.\n"
        print "If you proceed with the installation, services will be configured to always access the discovered server for all operation and will not fail over to other servers in case of failure\n"
        if not ask_for_confirmation("Do you want to proceed and configure the system with fixed values with no DNS discovery?"):
            return ret

    print "Realm: "+ds.getRealmName()
    print "DNS Domain: "+ds.getDomainName()
    print "IPA Server: "+ds.getServerName()
    print "BaseDN: "+ds.getBaseDN()

    print "\n"
    if not ask_for_confirmation("Continue to configure the system with these values?"):
        return 1

    # Configure ipa.conf
    ipaconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
    ipaconf.setOptionAssignment(" = ")
    ipaconf.setSectionNameDelimiters(("[","]"))

    opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
            {'name':'empty', 'type':'empty'}]

    #[defaults]
    defopts = [{'name':'server', 'type':'option', 'value':ds.getServerName()},
             {'name':'realm', 'type':'option', 'value':ds.getRealmName()}]

    opts.append({'name':'defaults', 'type':'section', 'value':defopts})
    opts.append({'name':'empty', 'type':'empty'})

    ipaconf.newConf("/etc/ipa/ipa.conf", opts)

    # Configure ldap.conf
    ldapconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
    ldapconf.setOptionAssignment(" ")

    opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
            {'name':'empty', 'type':'empty'},
            {'name':'nss_base_passwd', 'type':'option', 'value':ds.getBaseDN()+'?sub'},
            {'name':'nss_base_group', 'type':'option', 'value':ds.getBaseDN()+'?sub'},
            {'name':'base', 'type':'option', 'value':ds.getBaseDN()},
            {'name':'ldap_version', 'type':'option', 'value':'3'}]
    if not dnsok or options.force:
        opts.append({'name':'uri', 'type':'option', 'value':'ldap://'+ds.getServerName()})

    opts.append({'name':'empty', 'type':'empty'})
    ldapconf.newConf("/etc/ldap.conf", opts)

    #Check if kerberos is already configured properly
    krbctx = krbV.default_context()
    # If we find our domain assume we are properly configured
    #(ex. we are configuring the client side of a Master)
    if not krbctx.default_realm == ds.getRealmName() or options.force:

        #Configure krb5.conf
        krbconf = ipaclient.ipachangeconf.IPAChangeConf("IPA Installer")
        krbconf.setOptionAssignment(" = ")
        krbconf.setSectionNameDelimiters(("[","]"))
        krbconf.setSubSectionDelimiters(("{","}"))
        krbconf.setIndent(("","  ","    "))

        opts = [{'name':'comment', 'type':'comment', 'value':'File modified by ipa-client-install'},
                {'name':'empty', 'type':'empty'}]

        #[libdefaults]
        libopts = [{'name':'default_realm', 'type':'option', 'value':ds.getRealmName()}]
        if dnsok and not options.force:
            libopts.append({'name':'dns_lookup_realm', 'type':'option', 'value':'true'})
            libopts.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'true'})
        else:
            libopts.append({'name':'dns_lookup_realm', 'type':'option', 'value':'false'})
            libopts.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'false'})
        libopts.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
        libopts.append({'name':'forwardable', 'type':'option', 'value':'yes'})

        opts.append({'name':'libdefaults', 'type':'section', 'value':libopts})
        opts.append({'name':'empty', 'type':'empty'})

	#the following are necessary only if DNS discovery does not work
        if not dnsok or options.force:
            #[realms]
            kropts =[{'name':'kdc', 'type':'option', 'value':ds.getServerName()+':88'},
                     {'name':'admin_server', 'type':'option', 'value':ds.getServerName()+':749'},
                     {'name':'default_domain', 'type':'option', 'value':ds.getDomainName()}]
            ropts = [{'name':ds.getRealmName(), 'type':'subsection', 'value':kropts}]
            opts.append({'name':'realms', 'type':'section', 'value':ropts})
            opts.append({'name':'empty', 'type':'empty'})

            #[domain_realm]
            dropts = [{'name':'.'+ds.getDomainName(), 'type':'option', 'value':ds.getRealmName()},
                      {'name':ds.getDomainName(), 'type':'option', 'value':ds.getRealmName()}]
            opts.append({'name':'domain_realm', 'type':'section', 'value':dropts})
            opts.append({'name':'empty', 'type':'empty'})

        #[appdefaults]
        pamopts = [{'name':'debug', 'type':'option', 'value':'false'},
                   {'name':'ticket_lifetime', 'type':'option', 'value':'36000'},
                   {'name':'renew_lifetime', 'type':'option', 'value':'36000'},
                   {'name':'forwardable', 'type':'option', 'value':'true'},
                   {'name':'krb4_convert', 'type':'option', 'value':'false'}]
        appopts = [{'name':'pam', 'type':'subsection', 'value':pamopts}]
        opts.append({'name':'appdefaults', 'type':'section', 'value':appopts})

        krbconf.newConf("/etc/krb5.conf", opts);

    #Modify nsswitch to add nss_ldap
    run(["/usr/sbin/authconfig", "--enableldap", "--update"])

    #Modify pam to add pam_krb5
    run(["/usr/sbin/authconfig", "--enablekrb5", "--update"])

    if options.conf_ntp:
        ipaclient.ntpconf.config_ntp(ds.getServerName())

    return 0

sys.exit(main())