mirror of
https://salsa.debian.org/freeipa-team/freeipa.git
synced 2024-12-27 09:21:59 -06:00
341a12054a
The zonemgr validator and handler performs additional encodings for IDNA
support. In Python 3, the extra steps are no longer necessary because
arguments are already proper text and stderr can handle text correctly.
This also fixes 'b' prefix in error messages like:
option zonemgr: b'empty DNS label'
Fixes: https://pagure.io/freeipa/issue/7711
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
540 lines
19 KiB
Python
540 lines
19 KiB
Python
#
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# Copyright (C) 2015 FreeIPA Contributors see COPYING for license
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#
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"""
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DNS installer module
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"""
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from __future__ import absolute_import
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from __future__ import print_function
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import enum
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import logging
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import os
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# absolute import is necessary because IPA module dns clashes with python-dns
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from dns import resolver
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import six
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import sys
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from subprocess import CalledProcessError
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from ipalib import api
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from ipalib import errors
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from ipalib import util
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from ipalib.install import hostname, sysrestore
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from ipalib.install.service import enroll_only, prepare_only
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from ipaplatform.paths import paths
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from ipaplatform.constants import constants
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from ipaplatform import services
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from ipapython import ipautil
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from ipapython import dnsutil
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from ipapython.dn import DN
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from ipapython.dnsutil import check_zone_overlap
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from ipapython.install import typing
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from ipapython.install.core import group, knob
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from ipapython.admintool import ScriptError
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from ipapython.ipautil import user_input
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from ipaserver.install.installutils import get_server_ip_address
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from ipaserver.install.installutils import read_dns_forwarders
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from ipaserver.install.installutils import update_hosts_file
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from ipaserver.install import bindinstance
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from ipaserver.install import dnskeysyncinstance
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from ipaserver.install import odsexporterinstance
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from ipaserver.install import opendnssecinstance
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from ipaserver.install import service
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if six.PY3:
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unicode = str
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logger = logging.getLogger(__name__)
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ip_addresses = []
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reverse_zones = []
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def _find_dnssec_enabled_zones(conn):
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search_kw = {'idnssecinlinesigning': True}
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dnssec_enabled_filter = conn.make_filter(search_kw)
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dn = DN('cn=dns', api.env.basedn)
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try:
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entries, _truncated = conn.find_entries(
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base_dn=dn, filter=dnssec_enabled_filter, attrs_list=['idnsname'])
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except errors.NotFound:
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return []
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else:
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return [entry.single_value['idnsname'] for entry in entries
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if 'idnsname' in entry]
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def _is_master():
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# test if server is DNSSEC key master
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masters = opendnssecinstance.get_dnssec_key_masters(api.Backend.ldap2)
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if api.env.host not in masters:
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raise RuntimeError("Current server is not DNSSEC key master")
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def _disable_dnssec():
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fstore = sysrestore.FileStore(paths.SYSRESTORE)
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ods = opendnssecinstance.OpenDNSSECInstance(fstore)
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ods.realm = api.env.realm
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ods_exporter = odsexporterinstance.ODSExporterInstance(fstore)
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ods_exporter.realm = api.env.realm
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# unconfigure services first
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ods.uninstall() # needs keytab to flush the latest ods database
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ods_exporter.uninstall()
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ods.ldap_disable('DNSSEC', api.env.host, api.env.basedn)
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ods.ldap_remove_service_container('DNSSEC', api.env.host, api.env.basedn)
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ods_exporter.ldap_disable('DNSKeyExporter', api.env.host, api.env.basedn)
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ods_exporter.remove_service()
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ods_exporter.ldap_remove_service_container('DNSKeyExporter', api.env.host,
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api.env.basedn)
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conn = api.Backend.ldap2
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dn = DN(('cn', 'DNSSEC'), ('cn', api.env.host), ('cn', 'masters'),
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('cn', 'ipa'), ('cn', 'etc'), api.env.basedn)
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try:
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entry = conn.get_entry(dn)
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except errors.NotFound:
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pass
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else:
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ipa_config = entry.get('ipaConfigString', [])
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if opendnssecinstance.KEYMASTER in ipa_config:
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ipa_config.remove(opendnssecinstance.KEYMASTER)
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conn.update_entry(entry)
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def install_check(standalone, api, replica, options, hostname):
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global ip_addresses
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global reverse_zones
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fstore = sysrestore.FileStore(paths.SYSRESTORE)
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if not os.path.isfile(paths.IPA_DNS_INSTALL):
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raise RuntimeError("Integrated DNS requires '%s' package" %
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constants.IPA_DNS_PACKAGE_NAME)
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# when installing first DNS instance we need to check zone overlap
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if replica or standalone:
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already_enabled = api.Command.dns_is_enabled()['result']
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else:
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already_enabled = False
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if not already_enabled:
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domain = dnsutil.DNSName(util.normalize_zone(api.env.domain))
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try:
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dnsutil.check_zone_overlap(domain, raise_on_error=False)
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except ValueError as e:
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if options.force or options.allow_zone_overlap:
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logger.warning("%s Please make sure that the domain is "
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"properly delegated to this IPA server.",
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e)
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else:
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raise e
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for reverse_zone in options.reverse_zones:
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try:
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dnsutil.check_zone_overlap(reverse_zone)
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except ValueError as e:
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if options.force or options.allow_zone_overlap:
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logger.warning('%s', str(e))
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else:
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raise e
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if standalone:
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print("==============================================================================")
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print("This program will setup DNS for the FreeIPA Server.")
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print("")
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print("This includes:")
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print(" * Configure DNS (bind)")
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print(" * Configure SoftHSM (required by DNSSEC)")
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print(" * Configure ipa-dnskeysyncd (required by DNSSEC)")
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if options.dnssec_master:
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print(" * Configure ipa-ods-exporter (required by DNSSEC key master)")
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print(" * Configure OpenDNSSEC (required by DNSSEC key master)")
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print(" * Generate DNSSEC master key (required by DNSSEC key master)")
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elif options.disable_dnssec_master:
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print(" * Unconfigure ipa-ods-exporter")
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print(" * Unconfigure OpenDNSSEC")
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print("")
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print("No new zones will be signed without DNSSEC key master IPA server.")
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print("")
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print(("Please copy file from %s after uninstallation. This file is needed "
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"on new DNSSEC key " % paths.IPA_KASP_DB_BACKUP))
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print("master server")
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print("")
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print("NOTE: DNSSEC zone signing is not enabled by default")
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print("")
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if options.dnssec_master:
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print("Plan carefully, replacing DNSSEC key master is not recommended")
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print("")
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print("")
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print("To accept the default shown in brackets, press the Enter key.")
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print("")
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if (options.dnssec_master and not options.unattended and not
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ipautil.user_input(
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"Do you want to setup this IPA server as DNSSEC key master?",
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False)):
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sys.exit("Aborted")
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elif (options.disable_dnssec_master and not options.unattended and not
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ipautil.user_input(
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"Do you want to disable current DNSSEC key master?",
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False)):
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sys.exit("Aborted")
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if options.disable_dnssec_master:
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_is_master()
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if options.disable_dnssec_master or options.dnssec_master:
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dnssec_zones = _find_dnssec_enabled_zones(api.Backend.ldap2)
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if options.disable_dnssec_master:
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if dnssec_zones and not options.force:
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raise RuntimeError(
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"Cannot disable DNSSEC key master, DNSSEC signing is still "
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"enabled for following zone(s):\n"
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"%s\n"
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"It is possible to move DNSSEC key master role to a different "
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"server by using --force option to skip this check.\n\n"
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"WARNING: You have to immediately copy kasp.db file to a new "
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"server and run command 'ipa-dns-install --dnssec-master "
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"--kasp-db'.\n"
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"Your DNS zones will become unavailable if you "
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"do not reinstall the DNSSEC key master role immediately." %
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", ".join([str(zone) for zone in dnssec_zones]))
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elif options.dnssec_master:
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ods = opendnssecinstance.OpenDNSSECInstance(fstore)
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ods.realm = api.env.realm
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dnssec_masters = ods.get_masters()
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# we can reinstall current server if it is dnssec master
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if dnssec_masters and api.env.host not in dnssec_masters:
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print("DNSSEC key master(s):", u','.join(dnssec_masters))
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raise ScriptError(
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"Only one DNSSEC key master is supported in current version.")
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if options.kasp_db_file:
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dnskeysyncd = services.service('ipa-dnskeysyncd', api)
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if not dnskeysyncd.is_installed():
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raise RuntimeError("ipa-dnskeysyncd is not configured on this "
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"server, you cannot reuse OpenDNSSEC "
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"database (kasp.db file)")
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# check if replica can be the DNSSEC master
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cmd = [paths.IPA_DNSKEYSYNCD_REPLICA]
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environment = {
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"SOFTHSM2_CONF": paths.DNSSEC_SOFTHSM2_CONF,
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}
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# stop dnskeysyncd before test
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dnskeysyncd_running = dnskeysyncd.is_running()
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dnskeysyncd.stop()
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try:
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ipautil.run(cmd, env=environment,
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runas=constants.ODS_USER,
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suplementary_groups=[constants.NAMED_GROUP])
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except CalledProcessError as e:
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logger.debug("%s", e)
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raise RuntimeError("This IPA server cannot be promoted to "
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"DNSSEC master role because some keys were "
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"not replicated from the original "
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"DNSSEC master server")
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finally:
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if dnskeysyncd_running:
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dnskeysyncd.start()
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elif dnssec_zones and not options.force:
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# some zones have --dnssec=true, make sure a user really want to
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# install new database
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raise RuntimeError(
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"DNSSEC signing is already enabled for following zone(s): %s\n"
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"Installation cannot continue without the OpenDNSSEC database "
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"file from the original DNSSEC master server.\n"
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"Please use option --kasp-db to specify location "
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"of the kasp.db file copied from the original "
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"DNSSEC master server.\n"
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"WARNING: Zones will become unavailable if you do not provide "
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"the original kasp.db file." %
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", ".join([str(zone) for zone in dnssec_zones]))
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ip_addresses = get_server_ip_address(hostname, options.unattended,
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True, options.ip_addresses)
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util.no_matching_interface_for_ip_address_warning(ip_addresses)
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if not options.forward_policy:
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# user did not specify policy, derive it: default is 'first' but
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# if any of local IP addresses belongs to private ranges use 'only'
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options.forward_policy = 'first'
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for ip in ip_addresses:
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if dnsutil.inside_auto_empty_zone(dnsutil.DNSName(ip.reverse_dns)):
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options.forward_policy = 'only'
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logger.debug('IP address %s belongs to a private range, '
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'using forward policy only', ip)
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break
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if options.no_forwarders:
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options.forwarders = []
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elif options.forwarders or options.auto_forwarders:
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if not options.forwarders:
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options.forwarders = []
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if options.auto_forwarders:
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options.forwarders += resolver.get_default_resolver().nameservers
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elif standalone or not replica:
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options.forwarders = read_dns_forwarders()
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# test DNSSEC forwarders
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if options.forwarders:
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if not options.no_dnssec_validation \
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and not bindinstance.check_forwarders(options.forwarders):
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options.no_dnssec_validation = True
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print("WARNING: DNSSEC validation will be disabled")
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logger.debug("will use DNS forwarders: %s\n", options.forwarders)
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if not standalone:
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search_reverse_zones = False
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else:
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search_reverse_zones = True
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if not standalone and replica:
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reverse_zones_unattended_check = True
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else:
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reverse_zones_unattended_check = options.unattended
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reverse_zones = bindinstance.check_reverse_zones(
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ip_addresses, options.reverse_zones, options,
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reverse_zones_unattended_check, search_reverse_zones
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)
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if reverse_zones:
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print("Using reverse zone(s) %s" % ', '.join(reverse_zones))
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def install(standalone, replica, options, api=api):
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fstore = sysrestore.FileStore(paths.SYSRESTORE)
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if standalone:
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# otherwise this is done by server/replica installer
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update_hosts_file(ip_addresses, api.env.host, fstore)
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bind = bindinstance.BindInstance(fstore, api=api)
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bind.setup(api.env.host, ip_addresses, api.env.realm, api.env.domain,
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options.forwarders, options.forward_policy,
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reverse_zones, zonemgr=options.zonemgr,
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no_dnssec_validation=options.no_dnssec_validation)
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if standalone and not options.unattended:
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print("")
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print("The following operations may take some minutes to complete.")
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print("Please wait until the prompt is returned.")
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print("")
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bind.create_instance()
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print("Restarting the web server to pick up resolv.conf changes")
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services.knownservices.httpd.restart(capture_output=True)
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# on dnssec master this must be installed last
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dnskeysyncd = dnskeysyncinstance.DNSKeySyncInstance(fstore)
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dnskeysyncd.create_instance(api.env.host, api.env.realm)
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if options.dnssec_master:
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ods = opendnssecinstance.OpenDNSSECInstance(fstore)
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ods_exporter = odsexporterinstance.ODSExporterInstance(fstore)
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ods_exporter.create_instance(api.env.host, api.env.realm)
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ods.create_instance(api.env.host, api.env.realm,
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kasp_db_file=options.kasp_db_file)
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elif options.disable_dnssec_master:
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_disable_dnssec()
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dnskeysyncd.start_dnskeysyncd()
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bind.start_named()
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# Enable configured services for standalone check_global_configuration()
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if standalone:
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service.enable_services(api.env.host)
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# this must be done when bind is started and operational
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bind.update_system_records()
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if standalone:
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print("==============================================================================")
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print("Setup complete")
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print("")
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bind.check_global_configuration()
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print("")
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print("")
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print("\tYou must make sure these network ports are open:")
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print("\t\tTCP Ports:")
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print("\t\t * 53: bind")
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print("\t\tUDP Ports:")
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print("\t\t * 53: bind")
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elif not standalone and replica:
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print("")
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bind.check_global_configuration()
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print("")
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def uninstall_check(options):
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# test if server is DNSSEC key master
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masters = opendnssecinstance.get_dnssec_key_masters(api.Backend.ldap2)
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if api.env.host in masters:
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print("This server is active DNSSEC key master. Uninstall could break your DNS system.")
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if not (options.unattended or user_input(
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"Are you sure you want to continue with the uninstall "
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"procedure?", False)):
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print("")
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print("Aborting uninstall operation.")
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sys.exit(1)
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def uninstall():
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fstore = sysrestore.FileStore(paths.SYSRESTORE)
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ods = opendnssecinstance.OpenDNSSECInstance(fstore)
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if ods.is_configured():
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ods.uninstall()
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ods_exporter = odsexporterinstance.ODSExporterInstance(fstore)
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if ods_exporter.is_configured():
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ods_exporter.uninstall()
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bind = bindinstance.BindInstance(fstore)
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if bind.is_configured():
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bind.uninstall()
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dnskeysync = dnskeysyncinstance.DNSKeySyncInstance(fstore)
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if dnskeysync.is_configured():
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dnskeysync.uninstall()
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class DNSForwardPolicy(enum.Enum):
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ONLY = 'only'
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FIRST = 'first'
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@group
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class DNSInstallInterface(hostname.HostNameInstallInterface):
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"""
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Interface of the DNS installer
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Knobs defined here will be available in:
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* ipa-server-install
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* ipa-replica-prepare
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* ipa-replica-install
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* ipa-dns-install
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"""
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description = "DNS"
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allow_zone_overlap = knob(
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None,
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description="Create DNS zone even if it already exists",
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)
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allow_zone_overlap = prepare_only(allow_zone_overlap)
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reverse_zones = knob(
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# pylint: disable=invalid-sequence-index
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typing.List[str], [],
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description=("The reverse DNS zone to use. This option can be used "
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"multiple times"),
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cli_names='--reverse-zone',
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cli_metavar='REVERSE_ZONE',
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)
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reverse_zones = prepare_only(reverse_zones)
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@reverse_zones.validator
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def reverse_zones(self, values):
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if not self.allow_zone_overlap:
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for zone in values:
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check_zone_overlap(zone)
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no_reverse = knob(
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None,
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description="Do not create new reverse DNS zone",
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)
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no_reverse = prepare_only(no_reverse)
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auto_reverse = knob(
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None,
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description="Create necessary reverse zones",
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)
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auto_reverse = prepare_only(auto_reverse)
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zonemgr = knob(
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str, None,
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description=("DNS zone manager e-mail address. Defaults to "
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"hostmaster@DOMAIN"),
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)
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zonemgr = prepare_only(zonemgr)
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@zonemgr.validator
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def zonemgr(self, value):
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# validate the value first
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if six.PY3:
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bindinstance.validate_zonemgr_str(value)
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else:
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try:
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# IDNA support requires unicode
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encoding = getattr(sys.stdin, 'encoding', None)
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if encoding is None:
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encoding = 'utf-8'
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# value is string in py2 and py3
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if not isinstance(value, unicode):
|
|
value = value.decode(encoding)
|
|
|
|
bindinstance.validate_zonemgr_str(value)
|
|
except ValueError as e:
|
|
# FIXME we can do this in better way
|
|
# https://fedorahosted.org/freeipa/ticket/4804
|
|
# decode to proper stderr encoding
|
|
stderr_encoding = getattr(sys.stderr, 'encoding', None)
|
|
if stderr_encoding is None:
|
|
stderr_encoding = 'utf-8'
|
|
error = unicode(e).encode(stderr_encoding)
|
|
raise ValueError(error)
|
|
|
|
forwarders = knob(
|
|
# pylint: disable=invalid-sequence-index
|
|
typing.List[ipautil.CheckedIPAddressLoopback], None,
|
|
description=("Add a DNS forwarder. This option can be used multiple "
|
|
"times"),
|
|
cli_names='--forwarder',
|
|
)
|
|
forwarders = enroll_only(forwarders)
|
|
|
|
no_forwarders = knob(
|
|
None,
|
|
description="Do not add any DNS forwarders, use root servers instead",
|
|
)
|
|
no_forwarders = enroll_only(no_forwarders)
|
|
|
|
auto_forwarders = knob(
|
|
None,
|
|
description="Use DNS forwarders configured in /etc/resolv.conf",
|
|
)
|
|
auto_forwarders = enroll_only(auto_forwarders)
|
|
|
|
forward_policy = knob(
|
|
DNSForwardPolicy, None,
|
|
description=("DNS forwarding policy for global forwarders"),
|
|
)
|
|
forward_policy = enroll_only(forward_policy)
|
|
|
|
no_dnssec_validation = knob(
|
|
None,
|
|
description="Disable DNSSEC validation",
|
|
)
|
|
no_dnssec_validation = enroll_only(no_dnssec_validation)
|
|
|
|
dnssec_master = False
|
|
disable_dnssec_master = False
|
|
kasp_db_file = None
|
|
force = False
|