freeipa/ipaserver/install/server/install.py

#
# Copyright (C) 2015  FreeIPA Contributors see COPYING for license
#

from __future__ import print_function

import errno
import os
import pickle
import shutil
import sys
import tempfile
import textwrap

import six

from ipalib.install import certmonger, sysrestore
from ipapython import ipautil
from ipapython.dn import DN
from ipapython.ipa_log_manager import root_logger
from ipapython.ipautil import (
    format_netloc, ipa_generate_password, run, user_input)
from ipapython.admintool import ScriptError
from ipaplatform import services
from ipaplatform.paths import paths
from ipaplatform.tasks import tasks
from ipalib import api, constants, errors, x509
from ipalib.util import (
    validate_domain_name,
    network_ip_address_warning,
    broadcast_ip_address_warning,
)
import ipaclient.install.ntpconf
from ipaserver.install import (
    bindinstance, ca, cainstance, certs, dns, dsinstance,
    httpinstance, installutils, kra, krbinstance, memcacheinstance,
    ntpinstance, otpdinstance, custodiainstance, replication, service,
    sysupgrade)
from ipaserver.install.installutils import (
    IPA_MODULES, BadHostError, get_fqdn, get_server_ip_address,
    is_ipa_configured, load_pkcs12, read_password, verify_fqdn,
    update_hosts_file)
from ipaserver.plugins.ldap2 import ldap2

if six.PY3:
    unicode = str

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

NoneType = type(None)

SYSRESTORE_DIR_PATH = paths.SYSRESTORE


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))

    # TODO: Check https://fedorahosted.org/389/ticket/47849
    # Actual behavior of setup-ds.pl is that it does not accept white
    # space characters in password when called interactively but does when
    # provided such password in INF file. But it ignores leading and trailing
    # white spaces in INF file.

    # Disallow leading/trailing whaitespaces
    if password.strip() != password:
        raise ValueError('Password must not start or end with whitespace.')


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

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

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

    # These are the only ones that may be overridden
    try:
        del optdict['external_cert_files']
    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)
        installutils.encrypt_file(fname,
                                  paths.ROOT_IPA_CACHE,
                                  options['dm_password'],
                                  top_dir)
    except IOError as 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):
    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 = str(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 = str(user_input("Please provide a realm name",
                                domain_name.upper()))
    upper_dom = realm_name.upper()
    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):
            raise ScriptError(
                "An upper-case realm name is required. Unable to continue.")
        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",
                                   validator=validate_admin_password)
    return admin_password


def check_dirsrv(unattended):
    (ds_unsecure, ds_secure) = dsinstance.check_ports()
    if not ds_unsecure or not ds_secure:
        msg = ("IPA requires ports 389 and 636 for the Directory Server.\n"
               "These are currently in use:\n")
        if not ds_unsecure:
            msg += "\t389\n"
        if not ds_secure:
            msg += "\t636\n"
        raise ScriptError(msg)


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


def common_cleanup(func):
    def decorated(installer):
        success = False

        try:
            func(installer)
            success = True
        except KeyboardInterrupt:
            ds = installer._ds
            print("\nCleaning up...")
            if ds:
                print("Removing configuration for %s instance" % ds.serverid)
                ds.stop()
                if ds.serverid:
                    try:
                        dsinstance.remove_ds_instance(ds.serverid)
                    except ipautil.CalledProcessError:
                        root_logger.error("Failed to remove DS instance. You "
                                          "may need to remove instance data "
                                          "manually")
            raise ScriptError()
        finally:
            if not success and installer._installation_cleanup:
                # Do a cautious clean up as we don't know what failed and
                # what is the state of the environment
                try:
                    installer._fstore.restore_file(paths.HOSTS)
                except Exception:
                    pass

    return decorated


def remove_master_from_managed_topology(api_instance, options):
    try:
        # we may force the removal
        server_del_options = dict(
            force=True,
            ignore_topology_disconnect=options.ignore_topology_disconnect,
            ignore_last_of_role=options.ignore_last_of_role
        )

        replication.run_server_del_as_cli(
            api_instance, api_instance.env.host, **server_del_options)
    except errors.ServerRemovalError as e:
        raise ScriptError(str(e))
    except Exception as e:
        # if the master was already deleted we will just get a warning
        root_logger.warning("Failed to delete master: {}".format(e))


@common_cleanup
def install_check(installer):
    options = installer
    dirsrv_pkcs12_file = installer._dirsrv_pkcs12_file
    http_pkcs12_file = installer._http_pkcs12_file
    pkinit_pkcs12_file = installer._pkinit_pkcs12_file
    dirsrv_pkcs12_info = installer._dirsrv_pkcs12_info
    http_pkcs12_info = installer._http_pkcs12_info
    pkinit_pkcs12_info = installer._pkinit_pkcs12_info
    external_cert_file = installer._external_cert_file
    external_ca_file = installer._external_ca_file
    http_ca_cert = installer._ca_cert

    if tasks.is_fips_enabled():
        raise RuntimeError(
            "Installing IPA server in FIPS mode is not supported")

    tasks.check_selinux_status()

    if options.master_password:
        msg = ("WARNING:\noption '-P/--master-password' is deprecated. "
               "KDC master password of sufficient strength is autogenerated "
               "during IPA server installation and should not be set "
               "manually.")
        print(textwrap.fill(msg, width=79, replace_whitespace=False))

    installer._installation_cleanup = True

    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_files and
            is_ipa_configured()):
        installer._installation_cleanup = False
        raise ScriptError(
            "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(paths.IPA_CLIENT_SYSRESTORE)
    if client_fstore.has_files():
        installer._installation_cleanup = False
        raise ScriptError(
            "IPA client is already configured on this system.\n"
            "Please uninstall it before configuring the IPA server, "
            "using 'ipa-client-install --uninstall'")

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

    # This will override any settings passed in on the cmdline
    if ipautil.file_exists(paths.ROOT_IPA_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:
            raise ScriptError("Directory Manager password required")
        try:
            cache_vars = read_cache(dm_password)
            options.__dict__.update(cache_vars)
            if cache_vars.get('external_ca', False):
                options.external_ca = False
                options.interactive = False
        except Exception as e:
            raise ScriptError("Cannot process the cache file: %s" % str(e))

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

    # first instance of KRA must be installed by ipa-kra-install
    options.setup_kra = False

    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 not options.no_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 not options.no_pkinit:
        print("  * Configure the KDC to enable PKINIT")
    if options.no_ntp:
        print("")
        print("Excluded by options:")
        print("  * Configure the Network Time Daemon (ntpd)")
    if installer.interactive:
        print("")
        print("To accept the default shown in brackets, press the Enter key.")
    print("")

    if not options.external_cert_files:
        # Make sure the 389-ds ports are available
        check_dirsrv(not installer.interactive)

    if not options.no_ntp:
        try:
            ipaclient.install.ntpconf.check_timedate_services()
        except ipaclient.install.ntpconf.NTPConflictingService as e:
            print(("WARNING: conflicting time&date synchronization service '%s'"
                  " will be disabled" % e.conflicting_service))
            print("in favor of ntpd")
            print("")
        except ipaclient.install.ntpconf.NTPConfigurationError:
            pass

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

    if not options.setup_dns and installer.interactive:
        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:
        # 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

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

    try:
        if not installer.interactive 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 as e:
        raise ScriptError(e)

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

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

    domain_name = domain_name.lower()

    if not options.realm_name:
        realm_name = read_realm_name(domain_name, not installer.interactive)
        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))

    if options.http_cert_files:
        if options.http_pin is None:
            options.http_pin = installutils.read_password(
                "Enter Apache Server private key unlock",
                confirm=False, validate=False, retry=False)
            if options.http_pin is None:
                raise ScriptError(
                    "Apache Server private key unlock password required")
        http_pkcs12_file, http_pin, http_ca_cert = load_pkcs12(
            cert_files=options.http_cert_files,
            key_password=options.http_pin,
            key_nickname=options.http_cert_name,
            ca_cert_files=options.ca_cert_files,
            host_name=host_name)
        http_pkcs12_info = (http_pkcs12_file.name, http_pin)

    if options.dirsrv_cert_files:
        if options.dirsrv_pin is None:
            options.dirsrv_pin = read_password(
                "Enter Directory Server private key unlock",
                confirm=False, validate=False, retry=False)
            if options.dirsrv_pin is None:
                raise ScriptError(
                    "Directory Server private key unlock password required")
        dirsrv_pkcs12_file, dirsrv_pin, dirsrv_ca_cert = load_pkcs12(
            cert_files=options.dirsrv_cert_files,
            key_password=options.dirsrv_pin,
            key_nickname=options.dirsrv_cert_name,
            ca_cert_files=options.ca_cert_files,
            host_name=host_name)
        dirsrv_pkcs12_info = (dirsrv_pkcs12_file.name, dirsrv_pin)

    if options.pkinit_cert_files:
        if not options.no_pkinit:
            raise ScriptError("Cannot create KDC PKINIT certificate and use "
                              "provided external PKINIT certificate at the "
                              "same time. Please choose one of them.")

        if options.pkinit_pin is None:
            options.pkinit_pin = read_password(
                "Enter Kerberos KDC private key unlock",
                confirm=False, validate=False, retry=False)
            if options.pkinit_pin is None:
                raise ScriptError(
                    "Kerberos KDC private key unlock password required")
        pkinit_pkcs12_file, pkinit_pin, _pkinit_ca_cert = load_pkcs12(
            cert_files=options.pkinit_cert_files,
            key_password=options.pkinit_pin,
            key_nickname=options.pkinit_cert_name,
            ca_cert_files=options.ca_cert_files,
            host_name=host_name)
        pkinit_pkcs12_info = (pkinit_pkcs12_file.name, pkinit_pin)

    if (options.http_cert_files and options.dirsrv_cert_files and
            http_ca_cert != dirsrv_ca_cert):
        raise ScriptError(
            "Apache Server SSL certificate and Directory Server SSL "
            "certificate are not signed by the same CA certificate")

    if not options.dm_password:
        dm_password = read_dm_password()

        if dm_password is None:
            raise ScriptError("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:
            raise ScriptError("IPA admin password required")
    else:
        admin_password = options.admin_password

    # Configuration for ipalib, we will bootstrap and finalize later, after
    # we are sure we have the configuration file ready.
    cfg = dict(
        context='installer',
        confdir=paths.ETC_IPA,
        in_server=True,
        # make sure host name specified by user is used instead of default
        host=host_name,
    )
    if setup_ca:
        # we have an IPA-integrated CA
        cfg['ca_host'] = host_name

    # Create the management framework config file and finalize api
    target_fname = paths.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" %
             installutils.realm_to_serverid(realm_name))
    if setup_ca:
        fd.write("enable_ra=True\n")
        fd.write("ra_plugin=dogtag\n")
        fd.write("dogtag_version=10\n")
    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, 0o644)

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

    if setup_ca:
        ca.install_check(False, None, options)
        kra.install_check(api, None, options)

    if options.setup_dns:
        dns.install_check(False, api, False, options, host_name)
        ip_addresses = dns.ip_addresses
    else:
        ip_addresses = get_server_ip_address(host_name,
                                             not installer.interactive, False,
                                             options.ip_addresses)

        # check addresses here, dns module is doing own check
        network_ip_address_warning(ip_addresses)
        broadcast_ip_address_warning(ip_addresses)

    # installer needs to update hosts file when DNS subsystem will be
    # installed or custom addresses are used
    if options.ip_addresses or options.setup_dns:
        installer._update_hosts_file = True

    print()
    print("The IPA Master Server will be configured with:")
    print("Hostname:       %s" % host_name)
    print("IP address(es): %s" % ", ".join(str(ip) for ip in ip_addresses))
    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 options.forwarders
            else ", ".join([str(ip) for ip in options.forwarders])
        ))
        print('Forward policy:   %s' % options.forward_policy)
        print("Reverse zone(s):  %s" % (
            "No reverse zone" if options.no_reverse or not dns.reverse_zones
            else ", ".join(str(rz) for rz in dns.reverse_zones)
        ))
        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\nthe realm name of the IPA server matches "
              "its domain name.\n\n")

    if installer.interactive and not user_input(
            "Continue to configure the system with these values?", False):
        raise ScriptError("Installation aborted")

    options.realm_name = realm_name
    options.domain_name = domain_name
    options.dm_password = dm_password
    options.master_password = master_password
    options.admin_password = admin_password
    options._host_name_overridden = bool(options.host_name)
    options.host_name = host_name
    options.ip_addresses = ip_addresses

    installer._fstore = fstore
    installer._sstore = sstore
    installer._dirsrv_pkcs12_file = dirsrv_pkcs12_file
    installer._http_pkcs12_file = http_pkcs12_file
    installer._pkinit_pkcs12_file = pkinit_pkcs12_file
    installer._dirsrv_pkcs12_info = dirsrv_pkcs12_info
    installer._http_pkcs12_info = http_pkcs12_info
    installer._pkinit_pkcs12_info = pkinit_pkcs12_info
    installer._external_cert_file = external_cert_file
    installer._external_ca_file = external_ca_file
    installer._ca_cert = http_ca_cert


@common_cleanup
def install(installer):
    options = installer
    fstore = installer._fstore
    sstore = installer._sstore
    dirsrv_pkcs12_info = installer._dirsrv_pkcs12_info
    http_pkcs12_info = installer._http_pkcs12_info
    pkinit_pkcs12_info = installer._pkinit_pkcs12_info
    http_ca_cert = installer._ca_cert

    realm_name = options.realm_name
    domain_name = options.domain_name
    dm_password = options.dm_password
    master_password = options.master_password
    admin_password = options.admin_password
    host_name = options.host_name
    ip_addresses = options.ip_addresses
    setup_ca = options.setup_ca

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

    if installer.interactive:
        print("")
        print("The following operations may take some minutes to complete.")
        print("Please wait until the prompt is returned.")
        print("")

    # set hostname (transient and static) if user instructed us to do so
    if options._host_name_overridden:
        tasks.backup_hostname(fstore, sstore)
        tasks.set_hostname(host_name)

    if installer._update_hosts_file:
        update_hosts_file(ip_addresses, host_name, fstore)

    http_instance = httpinstance.HTTPInstance()
    http_instance.create_cert_db()

    # Create DS user/group if it doesn't exist yet
    dsinstance.create_ds_user()

    # Create a directory server instance
    if not options.external_cert_files:
        # Configure ntpd
        if not options.no_ntp:
            ipaclient.install.ntpconf.force_ntpd(sstore)
            ntp = ntpinstance.NTPInstance(fstore)
            if not ntp.is_configured():
                ntp.create_instance()

        if options.dirsrv_cert_files:
            ds = dsinstance.DsInstance(fstore=fstore,
                                       domainlevel=options.domainlevel,
                                       config_ldif=options.dirsrv_config_file)
            installer._ds = ds
            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.no_hbac_allow)
        else:
            ds = dsinstance.DsInstance(fstore=fstore,
                                       domainlevel=options.domainlevel,
                                       config_ldif=options.dirsrv_config_file)
            installer._ds = ds
            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.no_hbac_allow)

        ntpinstance.ntp_ldap_enable(host_name, ds.suffix, realm_name)

    else:
        api.Backend.ldap2.connect()
        ds = dsinstance.DsInstance(fstore=fstore,
                                   domainlevel=options.domainlevel)
        installer._ds = ds
        ds.init_info(
            realm_name, host_name, domain_name, dm_password,
            options.subject, 1101, 1100, None)

    if setup_ca:
        if not options.external_cert_files and options.external_ca:
            # 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.reverse_zones = dns.reverse_zones
            cache_vars = {n: options.__dict__[n] for o, n in installer.knobs()
                          if n in options.__dict__}
            write_cache(cache_vars)

        ca.install_step_0(False, None, options)

        # Now put the CA cert where other instances exepct it
        ca_instance = cainstance.CAInstance(realm_name, certs.NSS_DIR)
        ca_instance.publish_ca_cert(paths.IPA_CA_CRT)
    else:
        # Put the CA cert where other instances expect it
        x509.write_certificate(http_ca_cert, paths.IPA_CA_CRT)
        os.chmod(paths.IPA_CA_CRT, 0o444)

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

    krb = krbinstance.KrbInstance(fstore)
    krb.create_instance(realm_name, host_name, domain_name,
                        dm_password, master_password,
                        setup_pkinit=not options.no_pkinit,
                        pkcs12_info=pkinit_pkcs12_info,
                        subject_base=options.subject)

    # restart DS to enable ipa-pwd-extop plugin
    print("Restarting directory server to enable password extension plugin")
    ds.restart()

    if setup_ca:
        ca.install_step_1(False, None, options)
        kra.install(api, None, options)

    # 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,
                             ipautil.realm_to_suffix(realm_name))

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

    custodia = custodiainstance.CustodiaInstance(host_name, realm_name)
    custodia.create_instance()

    # Create a HTTP instance
    http = httpinstance.HTTPInstance(fstore)
    if options.http_cert_files:
        http.create_instance(
            realm_name, host_name, domain_name,
            pkcs12_info=http_pkcs12_info, subject_base=options.subject,
            auto_redirect=not options.no_ui_redirect,
            ca_is_configured=setup_ca)
    else:
        http.create_instance(
            realm_name, host_name, domain_name,
            subject_base=options.subject,
            auto_redirect=not options.no_ui_redirect,
            ca_is_configured=setup_ca)
    tasks.restore_context(paths.CACHE_IPA_SESSIONS)

    # Export full CA chain
    ca_db = certs.CertDB(realm_name)
    os.chmod(paths.IPA_CA_CRT, 0o644)
    ca_db.publish_ca_cert(paths.IPA_CA_CRT)

    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. DS is restarted in the process.
    service.print_msg("Applying LDAP updates")
    ds.apply_updates()

    # Restart krb after configurations have been changed
    service.print_msg("Restarting the KDC")
    krb.restart()

    if options.setup_dns:
        dns.install(False, False, options)
    else:
        # Create a BIND instance
        bind = bindinstance.BindInstance(fstore)
        bind.setup(host_name, ip_addresses, realm_name,
                   domain_name, (), 'first', (),
                   zonemgr=options.zonemgr,
                   no_dnssec_validation=options.no_dnssec_validation)
        bind.create_file_with_system_records()

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

    # Call client install script
    service.print_msg("Configuring client side components")
    try:
        args = [paths.IPA_CLIENT_INSTALL, "--on-master", "--unattended",
                "--domain", domain_name, "--server", host_name,
                "--realm", realm_name, "--hostname", host_name]
        if options.no_dns_sshfp:
            args.append("--no-dns-sshfp")
        if options.ssh_trust_dns:
            args.append("--ssh-trust-dns")
        if options.no_ssh:
            args.append("--no-ssh")
        if options.no_sshd:
            args.append("--no-sshd")
        if options.mkhomedir:
            args.append("--mkhomedir")
        run(args, redirect_output=True)
        print()
    except Exception:
        raise ScriptError("Configuration of client side components failed!")

    # Everything installed properly, activate ipa service.
    services.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 not options.no_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 services.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 certificates stored in " +
              paths.CACERT_P12))
        print("These files are required to create replicas. The password for "
              "these")
        print("files 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(paths.ROOT_IPA_CACHE):
        os.remove(paths.ROOT_IPA_CACHE)


@common_cleanup
def uninstall_check(installer):
    options = installer

    tasks.check_selinux_status()

    installer._installation_cleanup = False

    if not is_ipa_configured():
        print("WARNING:\nIPA server is not configured on this system. "
              "If you want to install the\nIPA server, please install "
              "it using 'ipa-server-install'.")

    fstore = sysrestore.FileStore(SYSRESTORE_DIR_PATH)
    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',
        confdir=paths.ETC_IPA,
        in_server=True,
    )

    # 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 installer.interactive:
        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):
            raise ScriptError("Aborting uninstall operation.")

    try:
        api.Backend.ldap2.connect(autobind=True)

        domain_level = dsinstance.get_domain_level(api)
    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"
               "If this server is the last instance of CA, KRA, or DNSSEC "
               "master, uninstallation may result in data loss.\n\n"
        )
        print(textwrap.fill(msg, width=80, replace_whitespace=False))

        if (installer.interactive and not user_input(
                "Are you sure you want to continue with the uninstall "
                "procedure?", False)):
            raise ScriptError("Aborting uninstall operation.")
    else:
        dns.uninstall_check(options)

        if domain_level == constants.DOMAIN_LEVEL_0:
            rm = replication.ReplicationManager(
                realm=api.env.realm,
                hostname=api.env.host,
                dirman_passwd=None,
                conn=api.Backend.ldap2
            )
            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 (installer.interactive and
                        not user_input("Are you sure you want to continue with"
                                       " the uninstall procedure?", False)):
                    raise ScriptError("Aborting uninstall operation.")
        else:
            remove_master_from_managed_topology(api, options)

        api.Backend.ldap2.disconnect()

    installer._fstore = fstore
    installer._sstore = sstore


@common_cleanup
def uninstall(installer):
    fstore = installer._fstore
    sstore = installer._sstore

    rv = 0

    print("Shutting down all IPA services")
    try:
        run([paths.IPACTL, "stop"], raiseonerr=False)
    except Exception:
        pass

    ntpinstance.NTPInstance(fstore).uninstall()

    kra.uninstall(False)

    ca.uninstall()

    dns.uninstall()

    httpinstance.HTTPInstance(fstore).uninstall()
    krbinstance.KrbInstance(fstore).uninstall()
    dsinstance.DsInstance(fstore=fstore).uninstall()
    if _server_trust_ad_installed:
        adtrustinstance.ADTRUSTInstance(fstore).uninstall()
    custodiainstance.CustodiaInstance().uninstall()
    memcacheinstance.MemcacheInstance().uninstall()
    otpdinstance.OtpdInstance().uninstall()
    tasks.restore_hostname(fstore, sstore)
    fstore.restore_all_files()
    try:
        os.remove(paths.ROOT_IPA_CACHE)
    except Exception:
        pass
    try:
        os.remove(paths.ROOT_IPA_CSR)
    except Exception:
        pass

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

    sstore._load()

    ipaclient.install.ntpconf.restore_forced_ntpd(sstore)

    # Clean up group_exists (unused since IPA 2.2, not being set since 4.1)
    sstore.restore_state("install", "group_exists")

    services.knownservices.ipa.disable()

    # 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(
        installutils.realm_to_serverid(api.env.realm))
    dirs = [dirname, paths.PKI_TOMCAT_ALIAS_DIR, certs.NSS_DIR]
    ids = certmonger.check_state(dirs)
    if ids:
        root_logger.error('Some certificates may still be tracked by '
                          'certmonger.\n'
                          'This will cause re-installation to fail.\n'
                          'Start the certmonger service and list the '
                          'certificates being tracked\n'
                          ' # getcert list\n'
                          'These may be untracked by executing\n'
                          ' # getcert stop-tracking -i <request_id>\n'
                          'for each id in: %s' % ', '.join(ids))

    # Remove the cert renewal lock file
    try:
        os.remove(paths.IPA_RENEWAL_LOCK)
    except OSError as e:
        if e.errno != errno.ENOENT:
            root_logger.warning("Failed to remove file %s: %s",
                                paths.IPA_RENEWAL_LOCK, e)

    print("Removing IPA client configuration")
    try:
        result = run([paths.IPA_CLIENT_INSTALL, "--on-master",
                      "--unattended", "--uninstall"],
                     raiseonerr=False, redirect_output=True)
        if result.returncode not in [0, 2]:
            raise RuntimeError("Failed to configure the client")
    except Exception:
        rv = 1
        print("Uninstall of client side components failed!")

    sys.exit(rv)


def init(installer):
    installer.unattended = not installer.interactive

    installer.domainlevel = installer.domain_level

    installer._installation_cleanup = True
    installer._ds = None

    installer._dirsrv_pkcs12_file = None
    installer._http_pkcs12_file = None
    installer._pkinit_pkcs12_file = None
    installer._dirsrv_pkcs12_info = None
    installer._http_pkcs12_info = None
    installer._pkinit_pkcs12_info = None
    installer._external_cert_file = None
    installer._external_ca_file = None
    installer._ca_cert = None
    installer._update_hosts_file = False