freeipa/install/tools/ipa-server-install

#! /usr/bin/python2 -E
# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#          Simo Sorce <ssorce@redhat.com>
#          Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2007-2010  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, either version 3 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, see <http://www.gnu.org/licenses/>.
#


# requires the following packages:
# fedora-ds-base
# openldap-clients
# nss-tools

import sys
import os
import grp
import signal
import shutil
import pickle
import random
import tempfile
import nss.error
import base64
import pwd
import textwrap
from optparse import OptionGroup, OptionValueError

try:
    from ipaserver.install import adtrustinstance
    _server_trust_ad_installed = True
except ImportError:
    _server_trust_ad_installed = False

from ipaserver.install import dsinstance
from ipaserver.install import krbinstance
from ipaserver.install import bindinstance
from ipaserver.install import httpinstance
from ipaserver.install import ntpinstance
from ipaserver.install import certs
from ipaserver.install import cainstance
from ipaserver.install import memcacheinstance
from ipaserver.install import otpdinstance
from ipaserver.install import sysupgrade
from ipaserver.install import replication
from ipaserver.install import service, installutils
from ipapython import version
from ipapython import certmonger
from ipapython import ipaldap
from ipaserver.install.installutils import *
from ipaserver.plugins.ldap2 import ldap2

from ipapython import sysrestore
from ipapython.ipautil import *
from ipapython import ipautil
from ipapython import dogtag
from ipalib import api, errors, util, x509
from ipapython.config import IPAOptionParser
from ipalib.x509 import load_certificate_from_file, load_certificate_chain_from_file
from ipalib.util import validate_domain_name
from ipapython import services as ipaservices
from ipapython.ipa_log_manager import *
from ipapython.dn import DN

import ipaclient.ntpconf

uninstalling = False
installation_cleanup = True

VALID_SUBJECT_ATTRS = ['st', 'o', 'ou', 'dnqualifier', 'c',
                       'serialnumber', 'l', 'title', 'sn', 'givenname',
                       'initials', 'generationqualifier', 'dc', 'mail',
                       'uid', 'postaladdress', 'postalcode', 'postofficebox',
                       'houseidentifier', 'e', 'street', 'pseudonym',
                       'incorporationlocality', 'incorporationstate',
                       'incorporationcountry', 'businesscategory']

SYSRESTORE_DIR_PATH = '/var/lib/ipa/sysrestore'

def subject_callback(option, opt_str, value, parser):
    """
    Make sure the certificate subject base is a valid DN
    """
    v = unicode(value, 'utf-8')
    if any(ord(c) < 0x20 for c in v):
        raise OptionValueError("Subject base must not contain control characters")
    if '&' in v:
        raise OptionValueError("Subject base must not contain an ampersand (\"&\")")
    try:
        dn = DN(v)
        for rdn in dn:
            if rdn.attr.lower() not in VALID_SUBJECT_ATTRS:
                raise OptionValueError('%s=%s has invalid attribute: "%s"' % (opt_str, value, rdn.attr))
    except ValueError, e:
        raise OptionValueError('%s=%s has invalid subject base format: %s' % (opt_str, value, e))
    parser.values.subject = dn

def validate_dm_password(password):
    if len(password) < 8:
        raise ValueError("Password must be at least 8 characters long")
    if any(ord(c) < 0x20 for c in password):
        raise ValueError("Password must not contain control characters")
    if any(ord(c) >= 0x7F for c in password):
        raise ValueError("Password must only contain ASCII characters")

    # Disallow characters that pkisilent doesn't process properly:
    bad_characters = ' &\\<%'
    if any(c in bad_characters for c in password):
        raise ValueError('Password must not contain these characters: %s' %
            ', '.join('"%s"' % c for c in bad_characters))

def parse_options():
    # Guaranteed to give a random 200k range below the 2G mark (uint32_t limit)
    namespace = random.randint(1, 10000) * 200000
    parser = IPAOptionParser(version=version.VERSION)

    basic_group = OptionGroup(parser, "basic options")
    basic_group.add_option("-r", "--realm", dest="realm_name",
                      help="realm name")
    basic_group.add_option("-n", "--domain", dest="domain_name",
                      help="domain name")
    basic_group.add_option("-p", "--ds-password", dest="dm_password",
                      sensitive=True, help="admin password")
    basic_group.add_option("-P", "--master-password",
                      dest="master_password", sensitive=True,
                      help="kerberos master password (normally autogenerated)")
    basic_group.add_option("-a", "--admin-password",
                      sensitive=True, dest="admin_password",
                      help="admin user kerberos password")
    basic_group.add_option("--mkhomedir",
                           dest="mkhomedir",
                           action="store_true",
                           default=False,
                           help="create home directories for users "
                                "on their first login")
    basic_group.add_option("--hostname", dest="host_name", help="fully qualified name of server")
    basic_group.add_option("--ip-address", dest="ip_address",
                      type="ip", ip_local=True,
                      help="Master Server IP Address")
    basic_group.add_option("-N", "--no-ntp", dest="conf_ntp", action="store_false",
                      help="do not configure ntp", default=True)
    basic_group.add_option("--idstart", dest="idstart", default=namespace, type=int,
                      help="The starting value for the IDs range (default random)")
    basic_group.add_option("--idmax", dest="idmax", default=0, type=int,
                      help="The max value value for the IDs range (default: idstart+199999)")
    basic_group.add_option("--no_hbac_allow", dest="hbac_allow", default=False,
                      action="store_true",
                      help="Don't install allow_all HBAC rule")
    basic_group.add_option("--no-ui-redirect", dest="ui_redirect", action="store_false",
                      default=True, help="Do not automatically redirect to the Web UI")
    basic_group.add_option("--ssh-trust-dns", dest="trust_sshfp", default=False, action="store_true",
                      help="configure OpenSSH client to trust DNS SSHFP records")
    basic_group.add_option("--no-ssh", dest="conf_ssh", default=True, action="store_false",
                      help="do not configure OpenSSH client")
    basic_group.add_option("--no-sshd", dest="conf_sshd", default=True, action="store_false",
                      help="do not configure OpenSSH server")
    basic_group.add_option("-d", "--debug", dest="debug", action="store_true",
                      default=False, help="print debugging information")
    basic_group.add_option("-U", "--unattended", dest="unattended", action="store_true",
                      default=False, help="unattended (un)installation never prompts the user")
    parser.add_option_group(basic_group)

    cert_group = OptionGroup(parser, "certificate system options")
    cert_group.add_option("", "--external-ca", dest="external_ca", action="store_true",
                      default=False, help="Generate a CSR to be signed by an external CA")
    cert_group.add_option("", "--external_cert_file", dest="external_cert_file",
                      help="PEM file containing a certificate signed by the external CA")
    cert_group.add_option("", "--external_ca_file", dest="external_ca_file",
                      help="PEM file containing the external CA chain")
    cert_group.add_option("--no-pkinit", dest="setup_pkinit", action="store_false",
                      default=True, help="disables pkinit setup steps")
    cert_group.add_option("--dirsrv_pkcs12", dest="dirsrv_pkcs12",
                      help="PKCS#12 file containing the Directory Server SSL certificate")
    cert_group.add_option("--http_pkcs12", dest="http_pkcs12",
                      help="PKCS#12 file containing the Apache Server SSL certificate")
    cert_group.add_option("--pkinit_pkcs12", dest="pkinit_pkcs12",
                      help="PKCS#12 file containing the Kerberos KDC SSL certificate")
    cert_group.add_option("--dirsrv_pin", dest="dirsrv_pin", sensitive=True,
                      help="The password of the Directory Server PKCS#12 file")
    cert_group.add_option("--http_pin", dest="http_pin", sensitive=True,
                      help="The password of the Apache Server PKCS#12 file")
    cert_group.add_option("--pkinit_pin", dest="pkinit_pin",
                      help="The password of the Kerberos KDC PKCS#12 file")
    cert_group.add_option("--root-ca-file", dest="root_ca_file",
                      help="PEM file with root CA certificate(s) to trust")
    cert_group.add_option("--subject", action="callback", callback=subject_callback,
                      type="string",
                      help="The certificate subject base (default O=<realm-name>)")
    parser.add_option_group(cert_group)

    dns_group = OptionGroup(parser, "DNS options")
    dns_group.add_option("--setup-dns", dest="setup_dns", action="store_true",
                      default=False, help="configure bind with our zone")
    dns_group.add_option("--forwarder", dest="forwarders", action="append",
                      type="ip", help="Add a DNS forwarder")
    dns_group.add_option("--no-forwarders", dest="no_forwarders", action="store_true",
                      default=False, help="Do not add any DNS forwarders, use root servers instead")
    dns_group.add_option("--reverse-zone", dest="reverse_zone", help="The reverse DNS zone to use")
    dns_group.add_option("--no-reverse", dest="no_reverse", action="store_true",
                      default=False, help="Do not create reverse DNS zone")
    dns_group.add_option("--zonemgr", action="callback", callback=bindinstance.zonemgr_callback,
                      type="string",
                      help="DNS zone manager e-mail address. Defaults to hostmaster@DOMAIN")
    dns_group.add_option("--no-host-dns", dest="no_host_dns", action="store_true",
                      default=False,
                      help="Do not use DNS for hostname lookup during installation")
    dns_group.add_option("--no-dns-sshfp", dest="create_sshfp", default=True, action="store_false",
                      help="Do not automatically create DNS SSHFP records")
    parser.add_option_group(dns_group)

    uninstall_group = OptionGroup(parser, "uninstall options")
    uninstall_group.add_option("", "--uninstall", dest="uninstall", action="store_true",
                      default=False, help="uninstall an existing installation. The uninstall can " \
                                          "be run with --unattended option")
    parser.add_option_group(uninstall_group)

    options, args = parser.parse_args()
    safe_options = parser.get_safe_opts(options)

    if options.dm_password is not None:
        try:
            validate_dm_password(options.dm_password)
        except ValueError, e:
            parser.error("DS admin password: " + str(e))
    if options.admin_password is not None and len(options.admin_password) < 8:
        parser.error("Admin user password must be at least 8 characters long")

    if options.domain_name is not None:
        try:
            validate_domain_name(options.domain_name)
        except ValueError, e:
            parser.error("invalid domain: " + unicode(e))

    if not options.setup_dns:
        if options.forwarders:
            parser.error("You cannot specify a --forwarder option without the --setup-dns option")
        if options.no_forwarders:
            parser.error("You cannot specify a --no-forwarders option without the --setup-dns option")
        if options.reverse_zone:
            parser.error("You cannot specify a --reverse-zone option without the --setup-dns option")
        if options.no_reverse:
            parser.error("You cannot specify a --no-reverse option without the --setup-dns option")
    elif options.forwarders and options.no_forwarders:
        parser.error("You cannot specify a --forwarder option together with --no-forwarders")
    elif options.reverse_zone and options.no_reverse:
        parser.error("You cannot specify a --reverse-zone option together with --no-reverse")

    if options.uninstall:
        if (options.realm_name or
            options.admin_password or options.master_password):
            parser.error("In uninstall mode, -a, -r and -P options are not allowed")
    elif options.unattended:
        if (not options.realm_name or
            not options.dm_password or not options.admin_password):
            parser.error("In unattended mode you need to provide at least -r, -p and -a options")
        if options.setup_dns:
            if not options.forwarders and not options.no_forwarders:
                parser.error("You must specify at least one --forwarder option or --no-forwarders option")

    # If any of the PKCS#12 options are selected, all are required.
    pkcs12_req = (options.dirsrv_pkcs12, options.http_pkcs12)
    pkcs12_opt = (options.pkinit_pkcs12,)
    if any(pkcs12_req + pkcs12_opt) and not all(pkcs12_req):
        parser.error("--dirsrv_pkcs12 and --http_pkcs12 are required if any "
                     "PKCS#12 options are used.")

    if options.unattended:
        if options.dirsrv_pkcs12 and options.dirsrv_pin is None:
            parser.error("You must specify --dirsrv_pin with --dirsrv_pkcs12")
        if options.http_pkcs12 and options.http_pin is None:
            parser.error("You must specify --http_pin with --http_pkcs12")
        if options.pkinit_pkcs12 and options.pkinit_pin is None:
            parser.error("You must specify --pkinit_pin with --pkinit_pkcs12")

    if options.dirsrv_pkcs12 and not options.root_ca_file:
        parser.error(
            "--root-ca-file must be given with the PKCS#12 options.")

    if (options.external_cert_file or options.external_ca_file) and options.dirsrv_pkcs12:
        parser.error(
            "PKCS#12 options cannot be used with the external CA options.")

    if options.external_ca:
        if options.external_cert_file:
            parser.error("You cannot specify --external_cert_file together with --external-ca")
        if options.external_ca_file:
            parser.error("You cannot specify --external_ca_file together with --external-ca")
        if options.dirsrv_pkcs12:
            parser.error("You cannot specify PKCS#12 options together with --external-ca")

    if ((options.external_cert_file and not options.external_ca_file) or
       (not options.external_cert_file and options.external_ca_file)):
        parser.error("if either external CA option is used, both are required.")

    if (options.external_ca_file and not os.path.isabs(options.external_ca_file)):
        parser.error("--external-ca-file must use an absolute path")
    if (options.external_cert_file and not os.path.isabs(options.external_cert_file)):
        parser.error("--external-cert-file must use an absolute path")

    if options.idmax == 0:
        options.idmax = int(options.idstart) + 200000 - 1

    if options.idmax < options.idstart:
        parser.error("idmax (%u) cannot be smaller than idstart (%u)" %
                    (options.idmax, options.idstart))

    #Automatically disable pkinit w/ dogtag until that is supported
    options.setup_pkinit = False

    return safe_options, options

def signal_handler(signum, frame):
    global ds
    print "\nCleaning up..."
    if ds:
        print "Removing configuration for %s instance" % ds.serverid
        ds.stop()
        if ds.serverid:
            dsinstance.erase_ds_instance_data (ds.serverid)
    sys.exit(1)

ANSWER_CACHE = "/root/.ipa_cache"

def read_cache(dm_password):
    """
    Returns a dict of cached answers or empty dict if no cache file exists.
    """
    if not ipautil.file_exists(ANSWER_CACHE):
        return {}

    top_dir = tempfile.mkdtemp("ipa")
    fname = "%s/cache" % top_dir
    try:
        decrypt_file(ANSWER_CACHE, fname, dm_password, top_dir)
    except Exception, e:
        shutil.rmtree(top_dir)
        raise Exception("Decryption of answer cache in %s failed, please check your password." % ANSWER_CACHE)

    try:
        with open(fname, 'rb') as f:
            try:
                optdict = pickle.load(f)
            except Exception, e:
                raise Exception("Parse error in %s: %s" % (ANSWER_CACHE, str(e)))
    except IOError, e:
        raise Exception("Read error in %s: %s" % (ANSWER_CACHE, str(e)))
    finally:
        shutil.rmtree(top_dir)

    # These are the only ones that may be overridden
    for opt in ('external_ca_file', 'external_cert_file'):
        try:
            del optdict[opt]
        except KeyError:
            pass

    return optdict

def write_cache(options):
    """
    Takes a dict as input and writes a cached file of answers
    """
    top_dir = tempfile.mkdtemp("ipa")
    fname = "%s/cache" % top_dir
    try:
        with open(fname, 'wb') as f:
            pickle.dump(options, f)
        ipautil.encrypt_file(fname, ANSWER_CACHE, options['dm_password'], top_dir)
    except IOError, e:
        raise Exception("Unable to cache command-line options %s" % str(e))
    finally:
        shutil.rmtree(top_dir)

def read_host_name(host_default,no_host_dns=False):
    host_name = ""

    print "Enter the fully qualified domain name of the computer"
    print "on which you're setting up server software. Using the form"
    print "<hostname>.<domainname>"
    print "Example: master.example.com."
    print ""
    print ""
    if host_default == "":
        host_default = "master.example.com"
    host_name = user_input("Server host name", host_default, allow_empty = False)
    print ""
    verify_fqdn(host_name,no_host_dns)

    return host_name

def read_domain_name(domain_name, unattended):
    print "The domain name has been determined based on the host name."
    print ""
    if not unattended:
        domain_name = user_input("Please confirm the domain name", domain_name)
        print ""
    return domain_name

def read_realm_name(domain_name, unattended):
    print "The kerberos protocol requires a Realm name to be defined."
    print "This is typically the domain name converted to uppercase."
    print ""

    if unattended:
        return domain_name.upper()
    realm_name = user_input("Please provide a realm name", domain_name.upper())
    upper_dom = realm_name.upper()  #pylint: disable=E1103
    if upper_dom != realm_name:
        print "An upper-case realm name is required."
        if not user_input("Do you want to use " + upper_dom + " as realm name?", True):
            print ""
            print "An upper-case realm name is required. Unable to continue."
            sys.exit(1)
        else:
            realm_name = upper_dom
        print ""
    return realm_name


def read_dm_password():
    print "Certain directory server operations require an administrative user."
    print "This user is referred to as the Directory Manager and has full access"
    print "to the Directory for system management tasks and will be added to the"
    print "instance of directory server created for IPA."
    print "The password must be at least 8 characters long."
    print ""
    #TODO: provide the option of generating a random password
    dm_password = read_password("Directory Manager", validator=validate_dm_password)
    return dm_password

def read_admin_password():
    print "The IPA server requires an administrative user, named 'admin'."
    print "This user is a regular system account used for IPA server administration."
    print ""
    #TODO: provide the option of generating a random password
    admin_password = read_password("IPA admin")
    return admin_password

def check_dirsrv(unattended):
    (ds_unsecure, ds_secure) = dsinstance.check_ports()
    if not ds_unsecure or not ds_secure:
        print "IPA requires ports 389 and 636 for the Directory Server."
        print "These are currently in use:"
        if not ds_unsecure:
            print "\t389"
        if not ds_secure:
            print "\t636"
        sys.exit(1)

def uninstall():

    rv = 0

    print "Shutting down all IPA services"
    try:
        (stdout, stderr, rc) = run(["/usr/sbin/ipactl", "stop"], raiseonerr=False)
    except Exception, e:
        pass

    # Need to get dogtag info before /etc/ipa/default.conf is removed
    dogtag_constants = dogtag.configured_constants()

    print "Removing IPA client configuration"
    try:
        (stdout, stderr, rc) = run(["/usr/sbin/ipa-client-install", "--on-master", "--unattended", "--uninstall"], raiseonerr=False)
        if rc not in [0,2]:
            root_logger.debug("ipa-client-install returned %d" % rc)
            raise RuntimeError(stdout)
    except Exception, e:
        rv = 1
        print "Uninstall of client side components failed!"
        print "ipa-client-install returned: " + str(e)

    ntpinstance.NTPInstance(fstore).uninstall()
    if not dogtag_constants.SHARED_DB:
        cads_instance = cainstance.CADSInstance(
            dogtag_constants=dogtag_constants)
        if cads_instance.is_configured():
            cads_instance.uninstall()
    cainstance.stop_tracking_certificates(dogtag_constants)
    ca_instance = cainstance.CAInstance(
        api.env.realm, certs.NSS_DIR, dogtag_constants=dogtag_constants)
    if ca_instance.is_configured():
        ca_instance.uninstall()
    bindinstance.BindInstance(fstore).uninstall()
    httpinstance.HTTPInstance(fstore).uninstall()
    krbinstance.KrbInstance(fstore).uninstall()
    dsinstance.DsInstance(fstore=fstore).uninstall()
    if _server_trust_ad_installed:
        adtrustinstance.ADTRUSTInstance(fstore).uninstall()
    memcacheinstance.MemcacheInstance().uninstall()
    otpdinstance.OtpdInstance().uninstall()
    ipaservices.restore_network_configuration(fstore, sstore)
    fstore.restore_all_files()
    try:
        os.remove(ANSWER_CACHE)
    except Exception:
        pass

    # ipa-client-install removes /etc/ipa/default.conf

    sstore._load()

    ipaclient.ntpconf.restore_forced_ntpd(sstore)

    group_exists = sstore.restore_state("install", "group_exists")

    ipaservices.knownservices.ipa.disable()

    ipautil.restore_hostname(sstore)

    # remove upgrade state file
    sysupgrade.remove_upgrade_file()

    if fstore.has_files():
        root_logger.error('Some files have not been restored, see %s/sysrestore.index' % SYSRESTORE_DIR_PATH)
    has_state = False
    for module in IPA_MODULES: # from installutils
        if sstore.has_state(module):
            root_logger.error('Some installation state for %s has not been restored, see %s/sysrestore.state' % (module, SYSRESTORE_DIR_PATH))
            has_state = True
            rv = 1

    if has_state:
        root_logger.error('Some installation state has not been restored.\n'
                          'This may cause re-installation to fail.\n'
                          'It should be safe to remove %s/sysrestore.state but it may\n'
                          'mean your system hasn\'t be restored to its pre-installation state.' % SYSRESTORE_DIR_PATH)

    # Note that this name will be wrong after the first uninstall.
    dirname = dsinstance.config_dirname(dsinstance.realm_to_serverid(api.env.realm))
    dirs = [dirname, dogtag_constants.ALIAS_DIR, certs.NSS_DIR]
    ids = certmonger.check_state(dirs)
    if ids:
        root_logger.error('Some certificates may still be tracked by certmonger.\nThis will cause re-installation to fail.\nStart the certmonger service and list the certificates being tracked\n # getcert list\nThese may be untracked by executing\n # getcert stop-tracking -i <request_id>\nfor each id in: %s' % ', '.join(ids))

    return rv


def set_subject_in_config(realm_name, dm_password, suffix, subject_base):
        ldapuri = 'ldapi://%%2fvar%%2frun%%2fslapd-%s.socket' % (
            dsinstance.realm_to_serverid(realm_name)
        )
        try:
            conn = ldap2(shared_instance=False, ldap_uri=ldapuri, base_dn=suffix)
            conn.connect(bind_dn=DN(('cn', 'directory manager')), bind_pw=dm_password)
        except errors.ExecutionError, e:
            root_logger.critical("Could not connect to the Directory Server on %s" % realm_name)
            raise e
        (dn, entry_attrs) = conn.get_ipa_config()
        if 'ipacertificatesubjectbase' not in entry_attrs:
            mod = {'ipacertificatesubjectbase': str(subject_base)}
            conn.update_entry(dn, mod)
        conn.disconnect()


def main():
    global ds
    global uninstalling
    global installation_cleanup
    ds = None

    safe_options, options = parse_options()

    if os.getegid() != 0:
        sys.exit("Must be root to set up server")

    ipaservices.check_selinux_status()

    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)

    if options.uninstall:
        uninstalling = True
        standard_logging_setup("/var/log/ipaserver-uninstall.log", debug=options.debug)
        installation_cleanup = False
    else:
        standard_logging_setup("/var/log/ipaserver-install.log", debug=options.debug)
        print "\nThe log file for this installation can be found in /var/log/ipaserver-install.log"
        if not options.external_ca and not options.external_cert_file and is_ipa_configured():
            installation_cleanup = False
            sys.exit("IPA server is already configured on this system.\n" +
                "If you want to reinstall the IPA server, please uninstall " +
                "it first using 'ipa-server-install --uninstall'.")

        client_fstore = sysrestore.FileStore('/var/lib/ipa-client/sysrestore')
        if client_fstore.has_files():
            installation_cleanup = False
            sys.exit("IPA client is already configured on this system.\n" +
                "Please uninstall it before configuring the IPA server, " +
                "using 'ipa-client-install --uninstall'")

    root_logger.debug('%s was invoked with options: %s' % (sys.argv[0], safe_options))
    root_logger.debug("missing options might be asked for interactively later\n")

    global fstore
    fstore = sysrestore.FileStore(SYSRESTORE_DIR_PATH)
    global sstore
    sstore = sysrestore.StateFile(SYSRESTORE_DIR_PATH)

    # Configuration for ipalib, we will bootstrap and finalize later, after
    # we are sure we have the configuration file ready.
    cfg = dict(
        context='installer',
        in_server=True,
        debug=options.debug
    )

    if options.uninstall:

        # We will need at least api.env, finalize api now. This system is
        # already installed, so the configuration file is there.
        api.bootstrap(**cfg)
        api.finalize()

        if not options.unattended:
            print "\nThis is a NON REVERSIBLE operation and will delete all data and configuration!\n"
            if not user_input("Are you sure you want to continue with the uninstall procedure?", False):
                print ""
                print "Aborting uninstall operation."
                sys.exit(1)

        try:
            conn = ipaldap.IPAdmin(
                api.env.host,
                ldapi=True,
                realm=api.env.realm
            )
            conn.do_external_bind(pwd.getpwuid(os.geteuid()).pw_name)
        except Exception:
            msg = ("\nWARNING: Failed to connect to Directory Server to find "
                   "information about replication agreements. Uninstallation "
                   "will continue despite the possible existing replication "
                   "agreements.\n\n")
            print textwrap.fill(msg, width=80, replace_whitespace=False)
        else:
            rm = replication.ReplicationManager(
                realm=api.env.realm,
                hostname=api.env.host,
                dirman_passwd=None,
                conn=conn
            )
            agreements = rm.find_ipa_replication_agreements()

            if agreements:
                other_masters = [a.get('cn')[0][4:] for a in agreements]
                msg = (
                    "\nReplication agreements with the following IPA masters "
                    "found: %s. Removing any replication agreements before "
                    "uninstalling the server is strongly recommended. You can "
                    "remove replication agreements by running the following "
                    "command on any other IPA master:\n" % ", ".join(
                        other_masters)
                )
                cmd = "$ ipa-replica-manage del %s\n" % api.env.host
                print textwrap.fill(msg, width=80, replace_whitespace=False)
                print cmd
                if not (options.unattended or user_input("Are you sure you "
                                                         "want to continue "
                                                         "with the uninstall "
                                                         "procedure?",
                                                         False)):
                    print ""
                    print "Aborting uninstall operation."
                    sys.exit(1)

        return uninstall()

    if options.external_ca:
        if cainstance.is_step_one_done():
            print "CA is already installed.\nRun the installer with --external_cert_file and --external_ca_file."
            sys.exit(1)
    elif options.external_cert_file:
        if not cainstance.is_step_one_done():
            # This can happen if someone passes external_ca_file without
            # already having done the first stage of the CA install.
            print "CA is not installed yet. To install with an external CA is a two-stage process.\nFirst run the installer with --external-ca."
            sys.exit(1)

    # This will override any settings passed in on the cmdline
    if ipautil.file_exists(ANSWER_CACHE):
        if options.dm_password is not None:
            dm_password = options.dm_password
        else:
            dm_password = read_password("Directory Manager", confirm=False)
        if dm_password is None:
            sys.exit("Directory Manager password required")
        try:
            options._update_loose(read_cache(dm_password))
        except Exception, e:
            sys.exit("Cannot process the cache file: %s" % str(e))

    if options.external_cert_file:
        try:
            extcert = load_certificate_from_file(options.external_cert_file)
        except IOError, e:
            print "Can't load the PEM certificate: %s." % str(e)
            sys.exit(1)
        except nss.error.NSPRError:
            print "'%s' is not a valid PEM-encoded certificate." % options.external_cert_file
            sys.exit(1)

        certsubject = DN(str(extcert.subject))
        wantsubject = DN(('CN','Certificate Authority'), options.subject)
        if certsubject != wantsubject:
            print "Subject of the external certificate is not correct (got %s, expected %s)." % (certsubject, wantsubject)
            sys.exit(1)

        try:
            extchain = load_certificate_chain_from_file(options.external_ca_file)
        except IOError, e:
            print "Can't load the external CA chain: %s." % str(e)
            sys.exit(1)
        except nss.error.NSPRError:
            print "'%s' is not a valid PEM-encoded certificate chain." % options.external_ca_file
            sys.exit(1)

        certdict = dict((DN(str(cert.subject)), cert) for cert in extchain)
        del extchain
        certissuer = DN(str(extcert.issuer))
        if certissuer not in certdict:
            print "The external certificate is not signed by the external CA (unknown issuer %s)." % certissuer
            sys.exit(1)

        cert = extcert
        del extcert
        while cert.issuer != cert.subject:
            certissuer = DN(str(cert.issuer))
            if certissuer not in certdict:
                print "The external CA chain is incomplete (%s is missing from the chain)." % certissuer
                sys.exit(1)
            del cert
            cert = certdict[certissuer]
        del certdict
        del cert

    # We only set up the CA if the PKCS#12 options are not given.
    if options.dirsrv_pkcs12:
        setup_ca = False
    else:
        setup_ca = True

    # Figure out what external CA step we're in. See cainstance.py for more
    # info on the 3 states.
    if options.external_cert_file:
        external = 2
    elif options.external_ca:
        external = 1
    else:
        external = 0

    print "=============================================================================="
    print "This program will set up the FreeIPA Server."
    print ""
    print "This includes:"
    if setup_ca:
        print "  * Configure a stand-alone CA (dogtag) for certificate management"
    if options.conf_ntp:
        print "  * Configure the Network Time Daemon (ntpd)"
    print "  * Create and configure an instance of Directory Server"
    print "  * Create and configure a Kerberos Key Distribution Center (KDC)"
    print "  * Configure Apache (httpd)"
    if options.setup_dns:
        print "  * Configure DNS (bind)"
    if options.setup_pkinit:
        print "  * Configure the KDC to enable PKINIT"
    if not options.conf_ntp:
        print ""
        print "Excluded by options:"
        print "  * Configure the Network Time Daemon (ntpd)"
    if not options.unattended:
        print ""
        print "To accept the default shown in brackets, press the Enter key."
    print ""

    if external != 2:
        # Make sure the 389-ds ports are available
        check_dirsrv(options.unattended)

    if options.conf_ntp:
        try:
            ipaclient.ntpconf.check_timedate_services()
        except ipaclient.ntpconf.NTPConflictingService, e:
            print "WARNING: conflicting time&date synchronization service '%s'" \
                  " will be disabled" % e.conflicting_service
            print "in favor of ntpd"
            print ""
        except ipaclient.ntpconf.NTPConfigurationError:
            pass

    # Check to see if httpd is already configured to listen on 443
    if httpinstance.httpd_443_configured():
        sys.exit("Aborting installation")

    realm_name = ""
    host_name = ""
    domain_name = ""
    ip_address = ""
    master_password = ""
    dm_password = ""
    admin_password = ""
    reverse_zone = None

    if not options.setup_dns and not options.unattended:
        if ipautil.user_input("Do you want to configure integrated DNS (BIND)?", False):
            options.setup_dns = True
        print ""

    # check bind packages are installed
    if options.setup_dns:
        if not bindinstance.check_inst(options.unattended):
            sys.exit("Aborting installation")

        # Don't require an external DNS to say who we are if we are
        # setting up a local DNS server.
        options.no_host_dns = True

    # check the hostname is correctly configured, it must be as the kldap
    # utilities just use the hostname as returned by getaddrinfo to set
    # up some of the standard entries

    host_default = ""
    if options.host_name:
        host_default = options.host_name
    else:
        host_default = get_fqdn()

    try:
        if options.unattended or options.host_name:
            verify_fqdn(host_default,options.no_host_dns)
            host_name = host_default
        else:
            host_name = read_host_name(host_default,options.no_host_dns)
    except BadHostError, e:
        sys.exit(str(e) + "\n")

    host_name = host_name.lower()
    root_logger.debug("will use host_name: %s\n" % host_name)

    system_hostname = get_fqdn()
    if host_name != system_hostname:
        print >>sys.stderr
        print >>sys.stderr, "Warning: hostname %s does not match system hostname %s." \
                            % (host_name, system_hostname)
        print >>sys.stderr, "System hostname will be updated during the installation process"
        print >>sys.stderr, "to prevent service failures."
        print >>sys.stderr

    if not options.domain_name:
        domain_name = read_domain_name(host_name[host_name.find(".")+1:], options.unattended)
        root_logger.debug("read domain_name: %s\n" % domain_name)
        try:
            validate_domain_name(domain_name)
        except ValueError, e:
            sys.exit("Invalid domain name: %s" % unicode(e))
    else:
        domain_name = options.domain_name

    domain_name = domain_name.lower()

    ip = get_server_ip_address(host_name, fstore, options.unattended, options)
    ip_address = str(ip)

    if options.reverse_zone and not bindinstance.verify_reverse_zone(options.reverse_zone, ip):
        sys.exit(1)

    if not options.realm_name:
        realm_name = read_realm_name(domain_name, options.unattended)
        root_logger.debug("read realm_name: %s\n" % realm_name)
    else:
        realm_name = options.realm_name.upper()

    if not options.subject:
        options.subject = DN(('O', realm_name))

    ca_file = options.root_ca_file

    if options.http_pkcs12:
        if options.http_pin is None:
            options.http_pin = installutils.read_password(
                "Enter %s unlock" % options.http_pkcs12,
                confirm=False, validate=False)
            if options.http_pin is None:
                sys.exit("%s unlock password required" % options.http_pkcs12)
        http_pkcs12_info = (options.http_pkcs12, options.http_pin)
        http_cert_name = installutils.check_pkcs12(
            http_pkcs12_info, ca_file, host_name)

    if options.dirsrv_pkcs12:
        if options.dirsrv_pin is None:
            options.dirsrv_pin = installutils.read_password(
                "Enter %s unlock" % options.dirsrv_pkcs12,
                confirm=False, validate=False)
            if options.dirsrv_pin is None:
                sys.exit("%s unlock password required" % options.dirsrv_pkcs12)
        dirsrv_pkcs12_info = (options.dirsrv_pkcs12, options.dirsrv_pin)
        dirsrv_cert_name = installutils.check_pkcs12(
            dirsrv_pkcs12_info, ca_file, host_name)

    if options.pkinit_pkcs12:
        if options.pkinit_pin is None:
            options.pkinit_pin = installutils.read_password(
                "Enter %s unlock" % options.pkinit_pkcs12,
                confirm=False, validate=False)
            if options.pkinit_pin is None:
                sys.exit("%s unlock password required" % options.pkinit_pkcs12)
        pkinit_pkcs12_info = (options.pkinit_pkcs12, options.pkinit_pin)

    if not options.dm_password:
        dm_password = read_dm_password()

        if dm_password is None:
            sys.exit("Directory Manager password required")
    else:
        dm_password = options.dm_password

    if not options.master_password:
        master_password = ipa_generate_password()
    else:
        master_password = options.master_password

    if not options.admin_password:
        admin_password = read_admin_password()
        if admin_password is None:
            sys.exit("IPA admin password required")
    else:
        admin_password = options.admin_password

    if options.setup_dns:
        if options.no_forwarders:
            dns_forwarders = ()
        elif options.forwarders:
            dns_forwarders = options.forwarders
        else:
            dns_forwarders = read_dns_forwarders()

        if options.reverse_zone:
            reverse_zone = bindinstance.normalize_zone(options.reverse_zone)
        elif not options.no_reverse:
            if options.unattended:
                reverse_zone = util.get_reverse_zone_default(ip)
            elif bindinstance.create_reverse():
                reverse_zone = util.get_reverse_zone_default(ip)
                reverse_zone = bindinstance.read_reverse_zone(reverse_zone, ip)

        if reverse_zone is not None:
            print "Using reverse zone %s" % reverse_zone
    else:
        dns_forwarders = ()
    root_logger.debug("will use dns_forwarders: %s\n" % str(dns_forwarders))

    print
    print "The IPA Master Server will be configured with:"
    print "Hostname:      %s" % host_name
    print "IP address:    %s" % ip_address
    print "Domain name:   %s" % domain_name
    print "Realm name:    %s" % realm_name
    print

    if options.setup_dns:
        print "BIND DNS server will be configured to serve IPA domain with:"
        print "Forwarders:    %s" % ("No forwarders" if not dns_forwarders \
                else ", ".join([str(ip) for ip in dns_forwarders]))
        print "Reverse zone:  %s" % ("No reverse zone" if options.no_reverse \
                or reverse_zone is None else reverse_zone)
        print

    # If domain name and realm does not match, IPA server will not be able
    # to estabilish trust with Active Directory. Print big fat warning.

    realm_not_matching_domain = (domain_name.upper() != realm_name)

    if realm_not_matching_domain:
        print("WARNING: Realm name does not match the domain name.\n"
              "You will not be able to estabilish trusts with Active "
              "Directory unless\nythe realm name of the IPA server matches "
              "its domain name.\n\n")

    if not options.unattended and not user_input("Continue to configure the system with these values?", False):
        sys.exit("Installation aborted")

    # Installation has started. No IPA sysrestore items are restored in case of
    # failure to enable root cause investigation
    installation_cleanup = False

    # Create the management framework config file and finalize api
    target_fname = '/etc/ipa/default.conf'
    fd = open(target_fname, "w")
    fd.write("[global]\n")
    fd.write("host=%s\n" % host_name)
    fd.write("basedn=%s\n" % ipautil.realm_to_suffix(realm_name))
    fd.write("realm=%s\n" % realm_name)
    fd.write("domain=%s\n" % domain_name)
    fd.write("xmlrpc_uri=https://%s/ipa/xml\n" % format_netloc(host_name))
    fd.write("ldap_uri=ldapi://%%2fvar%%2frun%%2fslapd-%s.socket\n" % dsinstance.realm_to_serverid(realm_name))
    if setup_ca:
        fd.write("enable_ra=True\n")
        fd.write("ra_plugin=dogtag\n")
        fd.write("dogtag_version=%s\n" %
            dogtag.install_constants.DOGTAG_VERSION)
    else:
        fd.write("enable_ra=False\n")
        fd.write("ra_plugin=none\n")
    fd.write("mode=production\n")
    fd.close()

    # Must be readable for everyone
    os.chmod(target_fname, 0644)

    api.bootstrap(**cfg)
    api.finalize()

    if not options.unattended:
        print ""
        print "The following operations may take some minutes to complete."
        print "Please wait until the prompt is returned."
        print ""

    if host_name != system_hostname:
        root_logger.debug("Chosen hostname (%s) differs from system hostname (%s) - change it" \
                      % (host_name, system_hostname))
        # configure /etc/sysconfig/network to contain the custom hostname
        ipaservices.backup_and_replace_hostname(fstore, sstore, host_name)

    # Create DS group if it doesn't exist yet
    dsinstance.create_ds_group()

    # Create a directory server instance
    if external != 2:
        # Configure ntpd
        if options.conf_ntp:
            ipaclient.ntpconf.force_ntpd(sstore)
            ntp = ntpinstance.NTPInstance(fstore)
            if not ntp.is_configured():
                ntp.create_instance()

        if options.dirsrv_pkcs12:
            ds = dsinstance.DsInstance(fstore=fstore,
                cert_nickname=dirsrv_cert_name)
            ds.create_instance(realm_name, host_name, domain_name,
                            dm_password, dirsrv_pkcs12_info,
                            idstart=options.idstart, idmax=options.idmax,
                            subject_base=options.subject,
                            hbac_allow=not options.hbac_allow,
                            ca_file=ca_file)
        else:
            ds = dsinstance.DsInstance(fstore=fstore)
            ds.create_instance(realm_name, host_name, domain_name,
                            dm_password,
                            idstart=options.idstart, idmax=options.idmax,
                            subject_base=options.subject,
                            hbac_allow=not options.hbac_allow)
    else:
        ds = dsinstance.DsInstance(fstore=fstore)
        ds.init_info(
            realm_name, host_name, domain_name, dm_password,
            options.subject, 1101, 1100, None)


    if setup_ca:
        ca = cainstance.CAInstance(realm_name, certs.NSS_DIR,
            dogtag_constants=dogtag.install_constants)
        if external == 0:
            ca.configure_instance(host_name, domain_name, dm_password,
                                  dm_password, subject_base=options.subject)
        elif external == 1:
            # stage 1 of external CA installation
            options.realm_name = realm_name
            options.domain_name = domain_name
            options.master_password = master_password
            options.dm_password = dm_password
            options.admin_password = admin_password
            options.host_name = host_name
            options.unattended = True
            options.forwarders = dns_forwarders
            options.reverse_zone = reverse_zone
            write_cache(vars(options))
            ca.configure_instance(host_name, domain_name, dm_password,
                                  dm_password, csr_file="/root/ipa.csr",
                                  subject_base=options.subject)
        else:
            # stage 2 of external CA installation
            ca.configure_instance(host_name, domain_name, dm_password,
                                  dm_password,
                                  cert_file=options.external_cert_file,
                                  cert_chain_file=options.external_ca_file,
                                  subject_base=options.subject)

        # Now put the CA cert where other instances exepct it
        ca.publish_ca_cert("/etc/ipa/ca.crt")

    # we now need to enable ssl on the ds
    ds.enable_ssl()
    ds.restart()

    if setup_ca:
        # We need to ldap_enable the CA now that DS is up and running
        ca.ldap_enable('CA', host_name, dm_password,
                       ipautil.realm_to_suffix(realm_name))

        # This is done within stopped_service context, which restarts CA
        ca.enable_client_auth_to_db()

        # Upload the CA cert to the directory
        ds.upload_ca_cert()
    else:
        with open(options.root_ca_file) as f:
            pem_cert = f.read()

        # Trust the CA cert
        root_logger.info(
            'Trusting certificate authority from %s' % options.root_ca_file)

        certs.NSSDatabase('/etc/pki/nssdb').import_pem_cert(
            'External CA cert', 'CT,,', options.root_ca_file)

        # Put a CA cert where other instances expect it
        with open('/etc/ipa/ca.crt', 'wb') as f:
            f.write(pem_cert)

        # Install the CA cert for the HTTP server
        with open('/usr/share/ipa/html/ca.crt', 'wb') as f:
            f.write(pem_cert)

        # Upload the CA cert to the directory
        ds.upload_ca_dercert(base64.b64decode(x509.strip_header(pem_cert)))

    krb = krbinstance.KrbInstance(fstore)
    if options.pkinit_pkcs12:
        krb.create_instance(realm_name, host_name, domain_name,
                            dm_password, master_password,
                            setup_pkinit=options.setup_pkinit,
                            pkcs12_info=pkinit_pkcs12_info,
                            subject_base=options.subject)
    else:
        krb.create_instance(realm_name, host_name, domain_name,
                            dm_password, master_password,
                            setup_pkinit=options.setup_pkinit,
                            subject_base=options.subject)

    # The DS instance is created before the keytab, add the SSL cert we
    # generated
    ds.add_cert_to_service()

    memcache = memcacheinstance.MemcacheInstance()
    memcache.create_instance('MEMCACHE', host_name, dm_password,
                             ipautil.realm_to_suffix(realm_name))

    otpd = otpdinstance.OtpdInstance()
    otpd.create_instance('OTPD', host_name, dm_password,
                         ipautil.realm_to_suffix(realm_name))

    # Create a HTTP instance
    http = httpinstance.HTTPInstance(fstore)
    if options.http_pkcs12:
        http.create_instance(
            realm_name, host_name, domain_name, dm_password,
            pkcs12_info=http_pkcs12_info, subject_base=options.subject,
            auto_redirect=options.ui_redirect, ca_file=ca_file)
    else:
        http.create_instance(
            realm_name, host_name, domain_name, dm_password,
            subject_base=options.subject, auto_redirect=options.ui_redirect)
    ipaservices.restore_context("/var/cache/ipa/sessions")

    set_subject_in_config(realm_name, dm_password, ipautil.realm_to_suffix(realm_name), options.subject)

    # Apply any LDAP updates. Needs to be done after the configuration file
    # is created
    service.print_msg("Applying LDAP updates")
    ds.apply_updates()

    # Restart ds and krb after configurations have been changed
    service.print_msg("Restarting the directory server")
    ds.restart()

    service.print_msg("Restarting the KDC")
    krb.restart()

    # Create a BIND instance
    bind = bindinstance.BindInstance(fstore, dm_password)
    bind.setup(host_name, ip_address, realm_name, domain_name, dns_forwarders,
               options.conf_ntp, reverse_zone, zonemgr=options.zonemgr,
               ca_configured=setup_ca)
    if options.setup_dns:
        api.Backend.ldap2.connect(bind_dn=DN(('cn', 'Directory Manager')), bind_pw=dm_password)

        bind.create_instance()
        print ""
        bind.check_global_configuration()
        print ""
    else:
        bind.create_sample_bind_zone()

    # Restart httpd to pick up the new IPA configuration
    service.print_msg("Restarting the web server")
    http.restart()

    # Set the admin user kerberos password
    ds.change_admin_password(admin_password)

    # Call client install script
    try:
        args = ["/usr/sbin/ipa-client-install", "--on-master", "--unattended", "--domain", domain_name, "--server", host_name, "--realm", realm_name, "--hostname", host_name]
        if not options.create_sshfp:
            args.append("--no-dns-sshfp")
        if options.trust_sshfp:
            args.append("--ssh-trust-dns")
        if not options.conf_ssh:
            args.append("--no-ssh")
        if not options.conf_sshd:
            args.append("--no-sshd")
        if options.mkhomedir:
            args.append("--mkhomedir")
        run(args)
    except Exception, e:
        sys.exit("Configuration of client side components failed!\nipa-client-install returned: " + str(e))


    #Everything installed properly, activate ipa service.
    ipaservices.knownservices.ipa.enable()

    print "=============================================================================="
    print "Setup complete"
    print ""
    print "Next steps:"
    print "\t1. You must make sure these network ports are open:"
    print "\t\tTCP Ports:"
    print "\t\t  * 80, 443: HTTP/HTTPS"
    print "\t\t  * 389, 636: LDAP/LDAPS"
    print "\t\t  * 88, 464: kerberos"
    if options.setup_dns:
        print "\t\t  * 53: bind"
    print "\t\tUDP Ports:"
    print "\t\t  * 88, 464: kerberos"
    if options.setup_dns:
        print "\t\t  * 53: bind"
    if options.conf_ntp:
        print "\t\t  * 123: ntp"
    print ""
    print "\t2. You can now obtain a kerberos ticket using the command: 'kinit admin'"
    print "\t   This ticket will allow you to use the IPA tools (e.g., ipa user-add)"
    print "\t   and the web user interface."

    if not ipaservices.knownservices.ntpd.is_running():
        print "\t3. Kerberos requires time synchronization between clients"
        print "\t   and servers for correct operation. You should consider enabling ntpd."

    print ""
    if setup_ca:
        print "Be sure to back up the CA certificate stored in /root/cacert.p12"
        print "This file is required to create replicas. The password for this"
        print "file is the Directory Manager password"
    else:
        print "In order for Firefox autoconfiguration to work you will need to"
        print "use a SSL signing certificate. See the IPA documentation for more details."

    if ipautil.file_exists(ANSWER_CACHE):
        os.remove(ANSWER_CACHE)
    return 0

if __name__ == '__main__':
    success = False

    try:
        # FIXME: Common option parsing, logging setup, etc should be factored
        # out from all install scripts
        safe_options, options = parse_options()
        if options.uninstall:
            log_file_name = "/var/log/ipaserver-uninstall.log"
        else:
            log_file_name = "/var/log/ipaserver-install.log"

        # Use private ccache
        with private_ccache():
            installutils.run_script(main, log_file_name=log_file_name,
                                    operation_name='ipa-server-install')
        success = True

    finally:
        if not success and installation_cleanup:
            # Do a cautious clean up as we don't know what failed and what is
            # the state of the environment
            try:
                fstore.restore_file('/etc/hosts')
            except:
                pass